From 4fdf7f432cc5db9531c03b9689b36a6395935fbc Mon Sep 17 00:00:00 2001 From: Michael Holzheu Date: Sun, 11 Mar 2012 11:59:24 -0400 Subject: [S390] Fix gcc 4.6.0 compile warning With gcc 4.6.0 we get a false compile warning: arch/s390/kernel/setup.c: In function 'setup_arch': arch/s390/kernel/setup.c:767:3: warning: 'msg' may be used uninitialized in this function [-Wuninitialized] arch/s390/kernel/setup.c:753:8: note: 'msg' was declared here This patch makes gcc quiet. Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 3b2efc8..778c100 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -747,7 +747,7 @@ static void __init reserve_crashkernel(void) { #ifdef CONFIG_CRASH_DUMP unsigned long long crash_base, crash_size; - char *msg; + char *msg = NULL; int rc; rc = parse_crashkernel(boot_command_line, memory_end, &crash_size, -- cgit v0.10.2 From 7e180bd8020d213bb0de15c3606968f8a9262439 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Sun, 11 Mar 2012 11:59:25 -0400 Subject: [S390] rename lowcore field The 16 bit value at the lowcore location with offset 0x84 is the cpu address that is associated with an external interrupt. Rename the field from cpu_addr to ext_cpu_addr to make that clear. Signed-off-by: Martin Schwidefsky diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h index 707f230..0831449 100644 --- a/arch/s390/include/asm/lowcore.h +++ b/arch/s390/include/asm/lowcore.h @@ -56,7 +56,7 @@ struct _lowcore { psw_t mcck_new_psw; /* 0x0070 */ psw_t io_new_psw; /* 0x0078 */ __u32 ext_params; /* 0x0080 */ - __u16 cpu_addr; /* 0x0084 */ + __u16 ext_cpu_addr; /* 0x0084 */ __u16 ext_int_code; /* 0x0086 */ __u16 svc_ilc; /* 0x0088 */ __u16 svc_code; /* 0x008a */ @@ -189,7 +189,7 @@ struct _lowcore { __u32 ipl_parmblock_ptr; /* 0x0014 */ __u8 pad_0x0018[0x0080-0x0018]; /* 0x0018 */ __u32 ext_params; /* 0x0080 */ - __u16 cpu_addr; /* 0x0084 */ + __u16 ext_cpu_addr; /* 0x0084 */ __u16 ext_int_code; /* 0x0086 */ __u16 svc_ilc; /* 0x0088 */ __u16 svc_code; /* 0x008a */ diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c index 6e6a72e..530ae0e 100644 --- a/arch/s390/kernel/asm-offsets.c +++ b/arch/s390/kernel/asm-offsets.c @@ -78,7 +78,7 @@ int main(void) BLANK(); /* lowcore offsets */ DEFINE(__LC_EXT_PARAMS, offsetof(struct _lowcore, ext_params)); - DEFINE(__LC_CPU_ADDRESS, offsetof(struct _lowcore, cpu_addr)); + DEFINE(__LC_EXT_CPU_ADDR, offsetof(struct _lowcore, ext_cpu_addr)); DEFINE(__LC_EXT_INT_CODE, offsetof(struct _lowcore, ext_int_code)); DEFINE(__LC_SVC_ILC, offsetof(struct _lowcore, svc_ilc)); DEFINE(__LC_SVC_INT_CODE, offsetof(struct _lowcore, svc_code)); diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 3705700..5f437b8 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -606,7 +606,7 @@ ext_skip: stm %r8,%r9,__PT_PSW(%r11) TRACE_IRQS_OFF lr %r2,%r11 # pass pointer to pt_regs - l %r3,__LC_CPU_ADDRESS # get cpu address + interruption code + l %r3,__LC_EXT_CPU_ADDR # get cpu address + interruption code l %r4,__LC_EXT_PARAMS # get external parameters l %r1,BASED(.Ldo_extint) basr %r14,%r1 # call do_extint diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 412a7b8..bacbd28 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -625,7 +625,7 @@ ext_skip: TRACE_IRQS_OFF lghi %r1,4096 lgr %r2,%r11 # pass pointer to pt_regs - llgf %r3,__LC_CPU_ADDRESS # get cpu address + interruption code + llgf %r3,__LC_EXT_CPU_ADDR # get cpu address + interruption code llgf %r4,__LC_EXT_PARAMS # get external parameter lg %r5,__LC_EXT_PARAMS2-4096(%r1) # get 64 bit external parameter brasl %r14,do_extint diff --git a/arch/s390/kernel/swsusp_asm64.S b/arch/s390/kernel/swsusp_asm64.S index acb78cd..2ef39d1 100644 --- a/arch/s390/kernel/swsusp_asm64.S +++ b/arch/s390/kernel/swsusp_asm64.S @@ -42,7 +42,7 @@ ENTRY(swsusp_arch_suspend) lghi %r1,0x1000 /* Save CPU address */ - stap __LC_CPU_ADDRESS(%r0) + stap __LC_EXT_CPU_ADDR(%r0) /* Store registers */ mvc 0x318(4,%r1),__SF_EMPTY(%r15) /* move prefix to lowcore */ @@ -173,7 +173,7 @@ pgm_check_entry: larl %r1,.Lresume_cpu /* Resume CPU address: r2 */ stap 0(%r1) llgh %r2,0(%r1) - llgh %r1,__LC_CPU_ADDRESS(%r0) /* Suspend CPU address: r1 */ + llgh %r1,__LC_EXT_CPU_ADDR(%r0) /* Suspend CPU address: r1 */ cgr %r1,%r2 je restore_registers /* r1 = r2 -> nothing to do */ larl %r4,.Lrestart_suspend_psw /* Set new restart PSW */ diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 278ee00..f0647ce 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -134,7 +134,7 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu, if (rc == -EFAULT) exception = 1; - rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, inti->emerg.code); + rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->emerg.code); if (rc == -EFAULT) exception = 1; @@ -156,7 +156,7 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu, if (rc == -EFAULT) exception = 1; - rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, inti->extcall.code); + rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, inti->extcall.code); if (rc == -EFAULT) exception = 1; @@ -202,7 +202,7 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu, if (rc == -EFAULT) exception = 1; - rc = put_guest_u16(vcpu, __LC_CPU_ADDRESS, 0x0d00); + rc = put_guest_u16(vcpu, __LC_EXT_CPU_ADDR, 0x0d00); if (rc == -EFAULT) exception = 1; -- cgit v0.10.2 From 8b646bd759086f6090fe27acf414c0b5faa737f4 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Sun, 11 Mar 2012 11:59:26 -0400 Subject: [S390] rework smp code Define struct pcpu and merge some of the NR_CPUS arrays into it, including __cpu_logical_map, current_set and smp_cpu_state. Split smp related functions to those operating on physical cpus and the functions operating on a logical cpu number. Make the functions for physical cpus use a pointer to a struct pcpu. This hides the knowledge about cpu addresses in smp.c, entry[64].S and swsusp_asm64.S, thus remove the sigp.h header. The PSW restart mechanism is used to start secondary cpus, calling a function on an online cpu, calling a function on the ipl cpu, and for the nmi signal. Replace the different assembler functions with a single function restart_int_handler. The new entry point calls a function whose pointer is stored in the lowcore of the target cpu and it can wait for the source cpu to stop. This covers all existing use cases. Overall the code is now simpler and there are ~380 lines less code. Reviewed-by: Heiko Carstens Signed-off-by: Martin Schwidefsky diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h index 0831449..4e69563 100644 --- a/arch/s390/include/asm/lowcore.h +++ b/arch/s390/include/asm/lowcore.h @@ -1,5 +1,5 @@ /* - * Copyright IBM Corp. 1999,2010 + * Copyright IBM Corp. 1999,2012 * Author(s): Hartmut Penner , * Martin Schwidefsky , * Denis Joseph Barrow, @@ -12,14 +12,6 @@ #include #include -void restart_int_handler(void); -void ext_int_handler(void); -void system_call(void); -void pgm_check_handler(void); -void mcck_int_handler(void); -void io_int_handler(void); -void psw_restart_int_handler(void); - #ifdef CONFIG_32BIT #define LC_ORDER 0 @@ -117,32 +109,37 @@ struct _lowcore { __u64 steal_timer; /* 0x0288 */ __u64 last_update_timer; /* 0x0290 */ __u64 last_update_clock; /* 0x0298 */ + __u64 int_clock; /* 0x02a0 */ + __u64 mcck_clock; /* 0x02a8 */ + __u64 clock_comparator; /* 0x02b0 */ /* Current process. */ - __u32 current_task; /* 0x02a0 */ - __u32 thread_info; /* 0x02a4 */ - __u32 kernel_stack; /* 0x02a8 */ + __u32 current_task; /* 0x02b8 */ + __u32 thread_info; /* 0x02bc */ + __u32 kernel_stack; /* 0x02c0 */ + + /* Interrupt, panic and restart stack. */ + __u32 async_stack; /* 0x02c4 */ + __u32 panic_stack; /* 0x02c8 */ + __u32 restart_stack; /* 0x02cc */ - /* Interrupt and panic stack. */ - __u32 async_stack; /* 0x02ac */ - __u32 panic_stack; /* 0x02b0 */ + /* Restart function and parameter. */ + __u32 restart_fn; /* 0x02d0 */ + __u32 restart_data; /* 0x02d4 */ + __u32 restart_source; /* 0x02d8 */ /* Address space pointer. */ - __u32 kernel_asce; /* 0x02b4 */ - __u32 user_asce; /* 0x02b8 */ - __u32 current_pid; /* 0x02bc */ + __u32 kernel_asce; /* 0x02dc */ + __u32 user_asce; /* 0x02e0 */ + __u32 current_pid; /* 0x02e4 */ /* SMP info area */ - __u32 cpu_nr; /* 0x02c0 */ - __u32 softirq_pending; /* 0x02c4 */ - __u32 percpu_offset; /* 0x02c8 */ - __u32 ext_call_fast; /* 0x02cc */ - __u64 int_clock; /* 0x02d0 */ - __u64 mcck_clock; /* 0x02d8 */ - __u64 clock_comparator; /* 0x02e0 */ - __u32 machine_flags; /* 0x02e8 */ - __u32 ftrace_func; /* 0x02ec */ - __u8 pad_0x02f8[0x0300-0x02f0]; /* 0x02f0 */ + __u32 cpu_nr; /* 0x02e8 */ + __u32 softirq_pending; /* 0x02ec */ + __u32 percpu_offset; /* 0x02f0 */ + __u32 machine_flags; /* 0x02f4 */ + __u32 ftrace_func; /* 0x02f8 */ + __u8 pad_0x02fc[0x0300-0x02fc]; /* 0x02fc */ /* Interrupt response block */ __u8 irb[64]; /* 0x0300 */ @@ -254,34 +251,39 @@ struct _lowcore { __u64 steal_timer; /* 0x02e0 */ __u64 last_update_timer; /* 0x02e8 */ __u64 last_update_clock; /* 0x02f0 */ + __u64 int_clock; /* 0x02f8 */ + __u64 mcck_clock; /* 0x0300 */ + __u64 clock_comparator; /* 0x0308 */ /* Current process. */ - __u64 current_task; /* 0x02f8 */ - __u64 thread_info; /* 0x0300 */ - __u64 kernel_stack; /* 0x0308 */ + __u64 current_task; /* 0x0310 */ + __u64 thread_info; /* 0x0318 */ + __u64 kernel_stack; /* 0x0320 */ + + /* Interrupt, panic and restart stack. */ + __u64 async_stack; /* 0x0328 */ + __u64 panic_stack; /* 0x0330 */ + __u64 restart_stack; /* 0x0338 */ - /* Interrupt and panic stack. */ - __u64 async_stack; /* 0x0310 */ - __u64 panic_stack; /* 0x0318 */ + /* Restart function and parameter. */ + __u64 restart_fn; /* 0x0340 */ + __u64 restart_data; /* 0x0348 */ + __u64 restart_source; /* 0x0350 */ /* Address space pointer. */ - __u64 kernel_asce; /* 0x0320 */ - __u64 user_asce; /* 0x0328 */ - __u64 current_pid; /* 0x0330 */ + __u64 kernel_asce; /* 0x0358 */ + __u64 user_asce; /* 0x0360 */ + __u64 current_pid; /* 0x0368 */ /* SMP info area */ - __u32 cpu_nr; /* 0x0338 */ - __u32 softirq_pending; /* 0x033c */ - __u64 percpu_offset; /* 0x0340 */ - __u64 ext_call_fast; /* 0x0348 */ - __u64 int_clock; /* 0x0350 */ - __u64 mcck_clock; /* 0x0358 */ - __u64 clock_comparator; /* 0x0360 */ - __u64 vdso_per_cpu_data; /* 0x0368 */ - __u64 machine_flags; /* 0x0370 */ - __u64 ftrace_func; /* 0x0378 */ - __u64 gmap; /* 0x0380 */ - __u8 pad_0x0388[0x0400-0x0388]; /* 0x0388 */ + __u32 cpu_nr; /* 0x0370 */ + __u32 softirq_pending; /* 0x0374 */ + __u64 percpu_offset; /* 0x0378 */ + __u64 vdso_per_cpu_data; /* 0x0380 */ + __u64 machine_flags; /* 0x0388 */ + __u64 ftrace_func; /* 0x0390 */ + __u64 gmap; /* 0x0398 */ + __u8 pad_0x03a0[0x0400-0x03a0]; /* 0x03a0 */ /* Interrupt response block. */ __u8 irb[64]; /* 0x0400 */ diff --git a/arch/s390/include/asm/sigp.h b/arch/s390/include/asm/sigp.h deleted file mode 100644 index 7040b85..0000000 --- a/arch/s390/include/asm/sigp.h +++ /dev/null @@ -1,132 +0,0 @@ -/* - * Routines and structures for signalling other processors. - * - * Copyright IBM Corp. 1999,2010 - * Author(s): Denis Joseph Barrow, - * Martin Schwidefsky , - * Heiko Carstens , - */ - -#ifndef __ASM_SIGP_H -#define __ASM_SIGP_H - -#include - -/* Get real cpu address from logical cpu number. */ -extern unsigned short __cpu_logical_map[]; - -static inline int cpu_logical_map(int cpu) -{ -#ifdef CONFIG_SMP - return __cpu_logical_map[cpu]; -#else - return stap(); -#endif -} - -enum { - sigp_sense = 1, - sigp_external_call = 2, - sigp_emergency_signal = 3, - sigp_start = 4, - sigp_stop = 5, - sigp_restart = 6, - sigp_stop_and_store_status = 9, - sigp_initial_cpu_reset = 11, - sigp_cpu_reset = 12, - sigp_set_prefix = 13, - sigp_store_status_at_address = 14, - sigp_store_extended_status_at_address = 15, - sigp_set_architecture = 18, - sigp_conditional_emergency_signal = 19, - sigp_sense_running = 21, -}; - -enum { - sigp_order_code_accepted = 0, - sigp_status_stored = 1, - sigp_busy = 2, - sigp_not_operational = 3, -}; - -/* - * Definitions for external call. - */ -enum { - ec_schedule = 0, - ec_call_function, - ec_call_function_single, - ec_stop_cpu, -}; - -/* - * Signal processor. - */ -static inline int raw_sigp(u16 cpu, int order) -{ - register unsigned long reg1 asm ("1") = 0; - int ccode; - - asm volatile( - " sigp %1,%2,0(%3)\n" - " ipm %0\n" - " srl %0,28\n" - : "=d" (ccode) - : "d" (reg1), "d" (cpu), - "a" (order) : "cc" , "memory"); - return ccode; -} - -/* - * Signal processor with parameter. - */ -static inline int raw_sigp_p(u32 parameter, u16 cpu, int order) -{ - register unsigned int reg1 asm ("1") = parameter; - int ccode; - - asm volatile( - " sigp %1,%2,0(%3)\n" - " ipm %0\n" - " srl %0,28\n" - : "=d" (ccode) - : "d" (reg1), "d" (cpu), - "a" (order) : "cc" , "memory"); - return ccode; -} - -/* - * Signal processor with parameter and return status. - */ -static inline int raw_sigp_ps(u32 *status, u32 parm, u16 cpu, int order) -{ - register unsigned int reg1 asm ("1") = parm; - int ccode; - - asm volatile( - " sigp %1,%2,0(%3)\n" - " ipm %0\n" - " srl %0,28\n" - : "=d" (ccode), "+d" (reg1) - : "d" (cpu), "a" (order) - : "cc" , "memory"); - *status = reg1; - return ccode; -} - -static inline int sigp(int cpu, int order) -{ - return raw_sigp(cpu_logical_map(cpu), order); -} - -static inline int sigp_p(u32 parameter, int cpu, int order) -{ - return raw_sigp_p(parameter, cpu_logical_map(cpu), order); -} - -static inline int sigp_ps(u32 *status, u32 parm, int cpu, int order) -{ - return raw_sigp_ps(status, parm, cpu_logical_map(cpu), order); -} - -#endif /* __ASM_SIGP_H */ diff --git a/arch/s390/include/asm/smp.h b/arch/s390/include/asm/smp.h index c32e912..797f787 100644 --- a/arch/s390/include/asm/smp.h +++ b/arch/s390/include/asm/smp.h @@ -1,5 +1,5 @@ /* - * Copyright IBM Corp. 1999,2009 + * Copyright IBM Corp. 1999,2012 * Author(s): Denis Joseph Barrow, * Martin Schwidefsky , * Heiko Carstens , @@ -10,71 +10,52 @@ #ifdef CONFIG_SMP #include -#include - -extern void machine_restart_smp(char *); -extern void machine_halt_smp(void); -extern void machine_power_off_smp(void); #define raw_smp_processor_id() (S390_lowcore.cpu_nr) -extern int __cpu_disable (void); -extern void __cpu_die (unsigned int cpu); -extern int __cpu_up (unsigned int cpu); - extern struct mutex smp_cpu_state_mutex; +extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1]; + +extern int __cpu_up(unsigned int cpu); extern void arch_send_call_function_single_ipi(int cpu); extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); -extern struct save_area *zfcpdump_save_areas[NR_CPUS + 1]; - -extern void smp_switch_to_ipl_cpu(void (*func)(void *), void *); -extern void smp_switch_to_cpu(void (*)(void *), void *, unsigned long sp, - int from, int to); -extern void smp_restart_with_online_cpu(void); -extern void smp_restart_cpu(void); +extern void smp_call_online_cpu(void (*func)(void *), void *); +extern void smp_call_ipl_cpu(void (*func)(void *), void *); -/* - * returns 1 if (virtual) cpu is scheduled - * returns 0 otherwise - */ -static inline int smp_vcpu_scheduled(int cpu) -{ - u32 status; - - switch (sigp_ps(&status, 0, cpu, sigp_sense_running)) { - case sigp_status_stored: - /* Check for running status */ - if (status & 0x400) - return 0; - break; - case sigp_not_operational: - return 0; - default: - break; - } - return 1; -} +extern int smp_find_processor_id(u16 address); +extern int smp_store_status(int cpu); +extern int smp_vcpu_scheduled(int cpu); +extern void smp_yield_cpu(int cpu); +extern void smp_yield(void); +extern void smp_stop_cpu(void); #else /* CONFIG_SMP */ -static inline void smp_switch_to_ipl_cpu(void (*func)(void *), void *data) +static inline void smp_call_ipl_cpu(void (*func)(void *), void *data) { func(data); } -static inline void smp_restart_with_online_cpu(void) +static inline void smp_call_online_cpu(void (*func)(void *), void *data) { + func(data); } -#define smp_vcpu_scheduled (1) +static inline int smp_find_processor_id(int address) { return 0; } +static inline int smp_vcpu_scheduled(int cpu) { return 1; } +static inline void smp_yield_cpu(int cpu) { } +static inline void smp_yield(void) { } +static inline void smp_stop_cpu(void) { } #endif /* CONFIG_SMP */ #ifdef CONFIG_HOTPLUG_CPU extern int smp_rescan_cpus(void); extern void __noreturn cpu_die(void); +extern void __cpu_die(unsigned int cpu); +extern int __cpu_disable(void); #else static inline int smp_rescan_cpus(void) { return 0; } static inline void cpu_die(void) { } diff --git a/arch/s390/include/asm/vdso.h b/arch/s390/include/asm/vdso.h index 533f357..c4a11cf 100644 --- a/arch/s390/include/asm/vdso.h +++ b/arch/s390/include/asm/vdso.h @@ -40,8 +40,8 @@ struct vdso_per_cpu_data { extern struct vdso_data *vdso_data; #ifdef CONFIG_64BIT -int vdso_alloc_per_cpu(int cpu, struct _lowcore *lowcore); -void vdso_free_per_cpu(int cpu, struct _lowcore *lowcore); +int vdso_alloc_per_cpu(struct _lowcore *lowcore); +void vdso_free_per_cpu(struct _lowcore *lowcore); #endif #endif /* __ASSEMBLY__ */ diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile index 7d9ec92..d0a4826 100644 --- a/arch/s390/kernel/Makefile +++ b/arch/s390/kernel/Makefile @@ -34,8 +34,6 @@ extra-y += $(if $(CONFIG_64BIT),head64.o,head31.o) obj-$(CONFIG_MODULES) += s390_ksyms.o module.o obj-$(CONFIG_SMP) += smp.o obj-$(CONFIG_SCHED_BOOK) += topology.o -obj-$(CONFIG_SMP) += $(if $(CONFIG_64BIT),switch_cpu64.o, \ - switch_cpu.o) obj-$(CONFIG_HIBERNATION) += suspend.o swsusp_asm64.o obj-$(CONFIG_AUDIT) += audit.o compat-obj-$(CONFIG_AUDIT) += compat_audit.o diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c index 530ae0e..aeeaf89 100644 --- a/arch/s390/kernel/asm-offsets.c +++ b/arch/s390/kernel/asm-offsets.c @@ -9,8 +9,8 @@ #include #include #include -#include #include +#include /* * Make sure that the compiler is new enough. We want a compiler that @@ -70,12 +70,6 @@ int main(void) DEFINE(__CLOCK_MONOTONIC, CLOCK_MONOTONIC); DEFINE(__CLOCK_REALTIME_RES, MONOTONIC_RES_NSEC); BLANK(); - /* constants for SIGP */ - DEFINE(__SIGP_STOP, sigp_stop); - DEFINE(__SIGP_RESTART, sigp_restart); - DEFINE(__SIGP_SENSE, sigp_sense); - DEFINE(__SIGP_INITIAL_CPU_RESET, sigp_initial_cpu_reset); - BLANK(); /* lowcore offsets */ DEFINE(__LC_EXT_PARAMS, offsetof(struct _lowcore, ext_params)); DEFINE(__LC_EXT_CPU_ADDR, offsetof(struct _lowcore, ext_cpu_addr)); @@ -95,20 +89,19 @@ int main(void) DEFINE(__LC_IO_INT_WORD, offsetof(struct _lowcore, io_int_word)); DEFINE(__LC_STFL_FAC_LIST, offsetof(struct _lowcore, stfl_fac_list)); DEFINE(__LC_MCCK_CODE, offsetof(struct _lowcore, mcck_interruption_code)); - DEFINE(__LC_DUMP_REIPL, offsetof(struct _lowcore, ipib)); - BLANK(); - DEFINE(__LC_RST_NEW_PSW, offsetof(struct _lowcore, restart_psw)); DEFINE(__LC_RST_OLD_PSW, offsetof(struct _lowcore, restart_old_psw)); DEFINE(__LC_EXT_OLD_PSW, offsetof(struct _lowcore, external_old_psw)); DEFINE(__LC_SVC_OLD_PSW, offsetof(struct _lowcore, svc_old_psw)); DEFINE(__LC_PGM_OLD_PSW, offsetof(struct _lowcore, program_old_psw)); DEFINE(__LC_MCK_OLD_PSW, offsetof(struct _lowcore, mcck_old_psw)); DEFINE(__LC_IO_OLD_PSW, offsetof(struct _lowcore, io_old_psw)); + DEFINE(__LC_RST_NEW_PSW, offsetof(struct _lowcore, restart_psw)); DEFINE(__LC_EXT_NEW_PSW, offsetof(struct _lowcore, external_new_psw)); DEFINE(__LC_SVC_NEW_PSW, offsetof(struct _lowcore, svc_new_psw)); DEFINE(__LC_PGM_NEW_PSW, offsetof(struct _lowcore, program_new_psw)); DEFINE(__LC_MCK_NEW_PSW, offsetof(struct _lowcore, mcck_new_psw)); DEFINE(__LC_IO_NEW_PSW, offsetof(struct _lowcore, io_new_psw)); + BLANK(); DEFINE(__LC_SAVE_AREA_SYNC, offsetof(struct _lowcore, save_area_sync)); DEFINE(__LC_SAVE_AREA_ASYNC, offsetof(struct _lowcore, save_area_async)); DEFINE(__LC_SAVE_AREA_RESTART, offsetof(struct _lowcore, save_area_restart)); @@ -129,12 +122,16 @@ int main(void) DEFINE(__LC_KERNEL_STACK, offsetof(struct _lowcore, kernel_stack)); DEFINE(__LC_ASYNC_STACK, offsetof(struct _lowcore, async_stack)); DEFINE(__LC_PANIC_STACK, offsetof(struct _lowcore, panic_stack)); + DEFINE(__LC_RESTART_STACK, offsetof(struct _lowcore, restart_stack)); + DEFINE(__LC_RESTART_FN, offsetof(struct _lowcore, restart_fn)); DEFINE(__LC_USER_ASCE, offsetof(struct _lowcore, user_asce)); DEFINE(__LC_INT_CLOCK, offsetof(struct _lowcore, int_clock)); DEFINE(__LC_MCCK_CLOCK, offsetof(struct _lowcore, mcck_clock)); DEFINE(__LC_MACHINE_FLAGS, offsetof(struct _lowcore, machine_flags)); DEFINE(__LC_FTRACE_FUNC, offsetof(struct _lowcore, ftrace_func)); DEFINE(__LC_IRB, offsetof(struct _lowcore, irb)); + DEFINE(__LC_DUMP_REIPL, offsetof(struct _lowcore, ipib)); + BLANK(); DEFINE(__LC_CPU_TIMER_SAVE_AREA, offsetof(struct _lowcore, cpu_timer_save_area)); DEFINE(__LC_CLOCK_COMP_SAVE_AREA, offsetof(struct _lowcore, clock_comp_save_area)); DEFINE(__LC_PSW_SAVE_AREA, offsetof(struct _lowcore, psw_save_area)); diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 5f437b8..6143521 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -2,7 +2,7 @@ * arch/s390/kernel/entry.S * S390 low-level entry points. * - * Copyright (C) IBM Corp. 1999,2006 + * Copyright (C) IBM Corp. 1999,2012 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), * Hartmut Penner (hp@de.ibm.com), * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), @@ -691,77 +691,30 @@ mcck_panic: 0: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) j mcck_skip -/* - * Restart interruption handler, kick starter for additional CPUs - */ -#ifdef CONFIG_SMP - __CPUINIT -ENTRY(restart_int_handler) - basr %r1,0 -restart_base: - spt restart_vtime-restart_base(%r1) - stck __LC_LAST_UPDATE_CLOCK - mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) - mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) - l %r15,__LC_GPREGS_SAVE_AREA+60 # load ksp - lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs - lam %a0,%a15,__LC_AREGS_SAVE_AREA - lm %r6,%r15,__SF_GPRS(%r15)# load registers from clone - l %r1,__LC_THREAD_INFO - mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) - mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) - xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER - ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off - basr %r14,0 - l %r14,restart_addr-.(%r14) - basr %r14,%r14 # call start_secondary -restart_addr: - .long start_secondary - .align 8 -restart_vtime: - .long 0x7fffffff,0xffffffff - .previous -#else -/* - * If we do not run with SMP enabled, let the new CPU crash ... - */ -ENTRY(restart_int_handler) - basr %r1,0 -restart_base: - lpsw restart_crash-restart_base(%r1) - .align 8 -restart_crash: - .long 0x000a0000,0x00000000 -restart_go: -#endif - # # PSW restart interrupt handler # -ENTRY(psw_restart_int_handler) +ENTRY(restart_int_handler) st %r15,__LC_SAVE_AREA_RESTART - basr %r15,0 -0: l %r15,.Lrestart_stack-0b(%r15) # load restart stack - l %r15,0(%r15) + l %r15,__LC_RESTART_STACK ahi %r15,-__PT_SIZE # create pt_regs on stack + xc 0(__PT_SIZE,%r15),0(%r15) stm %r0,%r14,__PT_R0(%r15) mvc __PT_R15(4,%r15),__LC_SAVE_AREA_RESTART mvc __PT_PSW(8,%r15),__LC_RST_OLD_PSW # store restart old psw - ahi %r15,-STACK_FRAME_OVERHEAD - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) - basr %r14,0 -1: l %r14,.Ldo_restart-1b(%r14) - basr %r14,%r14 - basr %r14,0 # load disabled wait PSW if -2: lpsw restart_psw_crash-2b(%r14) # do_restart returns - .align 4 -.Ldo_restart: - .long do_restart -.Lrestart_stack: - .long restart_stack - .align 8 -restart_psw_crash: - .long 0x000a0000,0x00000000 + restart_psw_crash + ahi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack + xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) + lm %r1,%r3,__LC_RESTART_FN # load fn, parm & source cpu + ltr %r3,%r3 # test source cpu address + jm 1f # negative -> skip source stop +0: sigp %r4,%r3,1 # sigp sense to source cpu + brc 10,0b # wait for status stored +1: basr %r14,%r1 # call function + stap __SF_EMPTY(%r15) # store cpu address + lh %r3,__SF_EMPTY(%r15) +2: sigp %r4,%r3,5 # sigp stop to current cpu + brc 2,2b +3: j 3b .section .kprobes.text, "ax" diff --git a/arch/s390/kernel/entry.h b/arch/s390/kernel/entry.h index bf538aa..92b1617 100644 --- a/arch/s390/kernel/entry.h +++ b/arch/s390/kernel/entry.h @@ -9,6 +9,14 @@ extern void (*pgm_check_table[128])(struct pt_regs *); extern void *restart_stack; +void system_call(void); +void pgm_check_handler(void); +void ext_int_handler(void); +void io_int_handler(void); +void mcck_int_handler(void); +void restart_int_handler(void); +void restart_call_handler(void); + asmlinkage long do_syscall_trace_enter(struct pt_regs *regs); asmlinkage void do_syscall_trace_exit(struct pt_regs *regs); @@ -26,7 +34,6 @@ void do_notify_resume(struct pt_regs *regs); void do_extint(struct pt_regs *regs, unsigned int, unsigned int, unsigned long); void do_restart(void); -int __cpuinit start_secondary(void *cpuvoid); void __init startup_init(void); void die(struct pt_regs *regs, const char *str); diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index bacbd28..e33789a 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -2,7 +2,7 @@ * arch/s390/kernel/entry64.S * S390 low-level entry points. * - * Copyright (C) IBM Corp. 1999,2010 + * Copyright (C) IBM Corp. 1999,2012 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), * Hartmut Penner (hp@de.ibm.com), * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), @@ -713,68 +713,30 @@ mcck_panic: 0: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) j mcck_skip -/* - * Restart interruption handler, kick starter for additional CPUs - */ -#ifdef CONFIG_SMP - __CPUINIT -ENTRY(restart_int_handler) - basr %r1,0 -restart_base: - spt restart_vtime-restart_base(%r1) - stck __LC_LAST_UPDATE_CLOCK - mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) - mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) - lghi %r10,__LC_GPREGS_SAVE_AREA - lg %r15,120(%r10) # load ksp - lghi %r10,__LC_CREGS_SAVE_AREA - lctlg %c0,%c15,0(%r10) # get new ctl regs - lghi %r10,__LC_AREGS_SAVE_AREA - lam %a0,%a15,0(%r10) - lmg %r6,%r15,__SF_GPRS(%r15)# load registers from clone - lg %r1,__LC_THREAD_INFO - mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) - mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) - xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER - ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off - brasl %r14,start_secondary - .align 8 -restart_vtime: - .long 0x7fffffff,0xffffffff - .previous -#else -/* - * If we do not run with SMP enabled, let the new CPU crash ... - */ -ENTRY(restart_int_handler) - basr %r1,0 -restart_base: - lpswe restart_crash-restart_base(%r1) - .align 8 -restart_crash: - .long 0x000a0000,0x00000000,0x00000000,0x00000000 -restart_go: -#endif - # # PSW restart interrupt handler # -ENTRY(psw_restart_int_handler) +ENTRY(restart_int_handler) stg %r15,__LC_SAVE_AREA_RESTART - larl %r15,restart_stack # load restart stack - lg %r15,0(%r15) + lg %r15,__LC_RESTART_STACK aghi %r15,-__PT_SIZE # create pt_regs on stack + xc 0(__PT_SIZE,%r15),0(%r15) stmg %r0,%r14,__PT_R0(%r15) mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw - aghi %r15,-STACK_FRAME_OVERHEAD - xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) - brasl %r14,do_restart - larl %r14,restart_psw_crash # load disabled wait PSW if - lpswe 0(%r14) # do_restart returns - .align 8 -restart_psw_crash: - .quad 0x0002000080000000,0x0000000000000000 + restart_psw_crash + aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack + xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) + lmg %r1,%r3,__LC_RESTART_FN # load fn, parm & source cpu + ltgr %r3,%r3 # test source cpu address + jm 1f # negative -> skip source stop +0: sigp %r4,%r3,1 # sigp sense to source cpu + brc 10,0b # wait for status stored +1: basr %r14,%r1 # call function + stap __SF_EMPTY(%r15) # store cpu address + llgh %r3,__SF_EMPTY(%r15) +2: sigp %r4,%r3,5 # sigp stop to current cpu + brc 2,2b +3: j 3b .section .kprobes.text, "ax" diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c index affa8e6..e5a72a2 100644 --- a/arch/s390/kernel/ipl.c +++ b/arch/s390/kernel/ipl.c @@ -2,7 +2,7 @@ * arch/s390/kernel/ipl.c * ipl/reipl/dump support for Linux on s390. * - * Copyright IBM Corp. 2005,2007 + * Copyright IBM Corp. 2005,2012 * Author(s): Michael Holzheu * Heiko Carstens * Volker Sameske @@ -25,7 +25,6 @@ #include #include #include -#include #include #include "entry.h" @@ -571,7 +570,7 @@ static void __ipl_run(void *unused) static void ipl_run(struct shutdown_trigger *trigger) { - smp_switch_to_ipl_cpu(__ipl_run, NULL); + smp_call_ipl_cpu(__ipl_run, NULL); } static int __init ipl_init(void) @@ -1101,7 +1100,7 @@ static void __reipl_run(void *unused) static void reipl_run(struct shutdown_trigger *trigger) { - smp_switch_to_ipl_cpu(__reipl_run, NULL); + smp_call_ipl_cpu(__reipl_run, NULL); } static void reipl_block_ccw_init(struct ipl_parameter_block *ipb) @@ -1421,7 +1420,7 @@ static void dump_run(struct shutdown_trigger *trigger) if (dump_method == DUMP_METHOD_NONE) return; smp_send_stop(); - smp_switch_to_ipl_cpu(__dump_run, NULL); + smp_call_ipl_cpu(__dump_run, NULL); } static int __init dump_ccw_init(void) @@ -1623,9 +1622,7 @@ static void stop_run(struct shutdown_trigger *trigger) if (strcmp(trigger->name, ON_PANIC_STR) == 0 || strcmp(trigger->name, ON_RESTART_STR) == 0) disabled_wait((unsigned long) __builtin_return_address(0)); - while (sigp(smp_processor_id(), sigp_stop) == sigp_busy) - cpu_relax(); - for (;;); + smp_stop_cpu(); } static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR, @@ -1738,9 +1735,8 @@ static ssize_t on_restart_store(struct kobject *kobj, static struct kobj_attribute on_restart_attr = __ATTR(on_restart, 0644, on_restart_show, on_restart_store); -void do_restart(void) +static void __do_restart(void *ignore) { - smp_restart_with_online_cpu(); smp_send_stop(); #ifdef CONFIG_CRASH_DUMP crash_kexec(NULL); @@ -1749,6 +1745,11 @@ void do_restart(void) stop_run(&on_restart_trigger); } +void do_restart(void) +{ + smp_call_online_cpu(__do_restart, NULL); +} + /* on halt */ static struct shutdown_trigger on_halt_trigger = {ON_HALT_STR, &stop_action}; diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c index 47b168f..bf6fbc0 100644 --- a/arch/s390/kernel/machine_kexec.c +++ b/arch/s390/kernel/machine_kexec.c @@ -49,50 +49,21 @@ static void add_elf_notes(int cpu) } /* - * Store status of next available physical CPU - */ -static int store_status_next(int start_cpu, int this_cpu) -{ - struct save_area *sa = (void *) 4608 + store_prefix(); - int cpu, rc; - - for (cpu = start_cpu; cpu < 65536; cpu++) { - if (cpu == this_cpu) - continue; - do { - rc = raw_sigp(cpu, sigp_stop_and_store_status); - } while (rc == sigp_busy); - if (rc != sigp_order_code_accepted) - continue; - if (sa->pref_reg) - return cpu; - } - return -1; -} - -/* * Initialize CPU ELF notes */ void setup_regs(void) { unsigned long sa = S390_lowcore.prefixreg_save_area + SAVE_AREA_BASE; - int cpu, this_cpu, phys_cpu = 0, first = 1; + int cpu, this_cpu; - this_cpu = stap(); - - if (!S390_lowcore.prefixreg_save_area) - first = 0; + this_cpu = smp_find_processor_id(stap()); + add_elf_notes(this_cpu); for_each_online_cpu(cpu) { - if (first) { - add_elf_notes(cpu); - first = 0; + if (cpu == this_cpu) + continue; + if (smp_store_status(cpu)) continue; - } - phys_cpu = store_status_next(phys_cpu, this_cpu); - if (phys_cpu == -1) - break; add_elf_notes(cpu); - phys_cpu++; } /* Copy dump CPU store status info to absolute zero */ memcpy((void *) SAVE_AREA_BASE, (void *) sa, sizeof(struct save_area)); @@ -255,5 +226,5 @@ void machine_kexec(struct kimage *image) return; tracer_disable(); smp_send_stop(); - smp_switch_to_ipl_cpu(__machine_kexec, image); + smp_call_ipl_cpu(__machine_kexec, image); } diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 778c100..9a3edb5 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -2,7 +2,7 @@ * arch/s390/kernel/setup.c * * S390 version - * Copyright (C) IBM Corp. 1999,2010 + * Copyright (C) IBM Corp. 1999,2012 * Author(s): Hartmut Penner (hp@de.ibm.com), * Martin Schwidefsky (schwidefsky@de.ibm.com) * @@ -62,6 +62,7 @@ #include #include #include +#include "entry.h" long psw_kernel_bits = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY | PSW_MASK_EA | PSW_MASK_BA; @@ -351,8 +352,9 @@ static void setup_addressing_mode(void) } } -static void __init -setup_lowcore(void) +void *restart_stack __attribute__((__section__(".data"))); + +static void __init setup_lowcore(void) { struct _lowcore *lc; @@ -363,7 +365,7 @@ setup_lowcore(void) lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0); lc->restart_psw.mask = psw_kernel_bits; lc->restart_psw.addr = - PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler; + PSW_ADDR_AMODE | (unsigned long) restart_int_handler; lc->external_new_psw.mask = psw_kernel_bits | PSW_MASK_DAT | PSW_MASK_MCHECK; lc->external_new_psw.addr = @@ -412,6 +414,24 @@ setup_lowcore(void) lc->last_update_timer = S390_lowcore.last_update_timer; lc->last_update_clock = S390_lowcore.last_update_clock; lc->ftrace_func = S390_lowcore.ftrace_func; + + restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); + restart_stack += ASYNC_SIZE; + + /* + * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant + * restart data to the absolute zero lowcore. This is necesary if + * PSW restart is done on an offline CPU that has lowcore zero. + */ + lc->restart_stack = (unsigned long) restart_stack; + lc->restart_fn = (unsigned long) do_restart; + lc->restart_data = 0; + lc->restart_source = -1UL; + memcpy(&S390_lowcore.restart_stack, &lc->restart_stack, + 4*sizeof(unsigned long)); + copy_to_absolute_zero(&S390_lowcore.restart_psw, + &lc->restart_psw, sizeof(psw_t)); + set_prefix((u32)(unsigned long) lc); lowcore_ptr[0] = lc; } @@ -572,27 +592,6 @@ static void __init setup_memory_end(void) } } -void *restart_stack __attribute__((__section__(".data"))); - -/* - * Setup new PSW and allocate stack for PSW restart interrupt - */ -static void __init setup_restart_psw(void) -{ - psw_t psw; - - restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0); - restart_stack += ASYNC_SIZE; - - /* - * Setup restart PSW for absolute zero lowcore. This is necesary - * if PSW restart is done on an offline CPU that has lowcore zero - */ - psw.mask = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA; - psw.addr = PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler; - copy_to_absolute_zero(&S390_lowcore.restart_psw, &psw, sizeof(psw)); -} - static void __init setup_vmcoreinfo(void) { #ifdef CONFIG_KEXEC @@ -782,8 +781,7 @@ static void __init reserve_crashkernel(void) #endif } -static void __init -setup_memory(void) +static void __init setup_memory(void) { unsigned long bootmap_size; unsigned long start_pfn, end_pfn; @@ -1014,8 +1012,7 @@ static void __init setup_hwcaps(void) * was printed. */ -void __init -setup_arch(char **cmdline_p) +void __init setup_arch(char **cmdline_p) { /* * print what head.S has found out about the machine @@ -1068,7 +1065,6 @@ setup_arch(char **cmdline_p) setup_memory(); setup_resources(); setup_vmcoreinfo(); - setup_restart_psw(); setup_lowcore(); cpu_init(); diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 2398ce6..6db8526 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -1,23 +1,18 @@ /* - * arch/s390/kernel/smp.c + * SMP related functions * - * Copyright IBM Corp. 1999, 2009 - * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), - * Martin Schwidefsky (schwidefsky@de.ibm.com) - * Heiko Carstens (heiko.carstens@de.ibm.com) + * Copyright IBM Corp. 1999,2012 + * Author(s): Denis Joseph Barrow, + * Martin Schwidefsky , + * Heiko Carstens , * * based on other smp stuff by * (c) 1995 Alan Cox, CymruNET Ltd * (c) 1998 Ingo Molnar * - * We work with logical cpu numbering everywhere we can. The only - * functions using the real cpu address (got from STAP) are the sigp - * functions. For all other functions we use the identity mapping. - * That means that cpu_number_map[i] == i for every cpu. cpu_number_map is - * used e.g. to find the idle task belonging to a logical cpu. Every array - * in the kernel is sorted by the logical cpu number and not by the physical - * one which is causing all the confusion with __cpu_logical_map and - * cpu_number_map in other architectures. + * The code outside of smp.c uses logical cpu numbers, only smp.c does + * the translation of logical to physical cpu ids. All new code that + * operates on physical cpu numbers needs to go into smp.c. */ #define KMSG_COMPONENT "cpu" @@ -31,140 +26,381 @@ #include #include #include -#include #include #include #include -#include -#include #include #include #include #include #include -#include -#include #include -#include #include #include #include #include -#include #include -#include #include "entry.h" -/* logical cpu to cpu address */ -unsigned short __cpu_logical_map[NR_CPUS]; +enum { + sigp_sense = 1, + sigp_external_call = 2, + sigp_emergency_signal = 3, + sigp_start = 4, + sigp_stop = 5, + sigp_restart = 6, + sigp_stop_and_store_status = 9, + sigp_initial_cpu_reset = 11, + sigp_cpu_reset = 12, + sigp_set_prefix = 13, + sigp_store_status_at_address = 14, + sigp_store_extended_status_at_address = 15, + sigp_set_architecture = 18, + sigp_conditional_emergency_signal = 19, + sigp_sense_running = 21, +}; -static struct task_struct *current_set[NR_CPUS]; +enum { + sigp_order_code_accepted = 0, + sigp_status_stored = 1, + sigp_busy = 2, + sigp_not_operational = 3, +}; -static u8 smp_cpu_type; -static int smp_use_sigp_detection; +enum { + ec_schedule = 0, + ec_call_function, + ec_call_function_single, + ec_stop_cpu, +}; -enum s390_cpu_state { +enum { CPU_STATE_STANDBY, CPU_STATE_CONFIGURED, }; +struct pcpu { + struct cpu cpu; + struct task_struct *idle; /* idle process for the cpu */ + struct _lowcore *lowcore; /* lowcore page(s) for the cpu */ + unsigned long async_stack; /* async stack for the cpu */ + unsigned long panic_stack; /* panic stack for the cpu */ + unsigned long ec_mask; /* bit mask for ec_xxx functions */ + int state; /* physical cpu state */ + u32 status; /* last status received via sigp */ + u16 address; /* physical cpu address */ +}; + +static u8 boot_cpu_type; +static u16 boot_cpu_address; +static struct pcpu pcpu_devices[NR_CPUS]; + DEFINE_MUTEX(smp_cpu_state_mutex); -static int smp_cpu_state[NR_CPUS]; -static DEFINE_PER_CPU(struct cpu, cpu_devices); +/* + * Signal processor helper functions. + */ +static inline int __pcpu_sigp(u16 addr, u8 order, u32 parm, u32 *status) +{ + register unsigned int reg1 asm ("1") = parm; + int cc; -static void smp_ext_bitcall(int, int); + asm volatile( + " sigp %1,%2,0(%3)\n" + " ipm %0\n" + " srl %0,28\n" + : "=d" (cc), "+d" (reg1) : "d" (addr), "a" (order) : "cc"); + if (status && cc == 1) + *status = reg1; + return cc; +} -static int raw_cpu_stopped(int cpu) +static inline int __pcpu_sigp_relax(u16 addr, u8 order, u32 parm, u32 *status) { - u32 status; + int cc; - switch (raw_sigp_ps(&status, 0, cpu, sigp_sense)) { - case sigp_status_stored: - /* Check for stopped and check stop state */ - if (status & 0x50) - return 1; - break; - default: - break; + while (1) { + cc = __pcpu_sigp(addr, order, parm, status); + if (cc != sigp_busy) + return cc; + cpu_relax(); } - return 0; } -static inline int cpu_stopped(int cpu) +static int pcpu_sigp_retry(struct pcpu *pcpu, u8 order, u32 parm) { - return raw_cpu_stopped(cpu_logical_map(cpu)); + int cc, retry; + + for (retry = 0; ; retry++) { + cc = __pcpu_sigp(pcpu->address, order, parm, &pcpu->status); + if (cc != sigp_busy) + break; + if (retry >= 3) + udelay(10); + } + return cc; +} + +static inline int pcpu_stopped(struct pcpu *pcpu) +{ + if (__pcpu_sigp(pcpu->address, sigp_sense, + 0, &pcpu->status) != sigp_status_stored) + return 0; + /* Check for stopped and check stop state */ + return !!(pcpu->status & 0x50); +} + +static inline int pcpu_running(struct pcpu *pcpu) +{ + if (__pcpu_sigp(pcpu->address, sigp_sense_running, + 0, &pcpu->status) != sigp_status_stored) + return 1; + /* Check for running status */ + return !(pcpu->status & 0x400); } /* - * Ensure that PSW restart is done on an online CPU + * Find struct pcpu by cpu address. */ -void smp_restart_with_online_cpu(void) +static struct pcpu *pcpu_find_address(const struct cpumask *mask, int address) { int cpu; - for_each_online_cpu(cpu) { - if (stap() == __cpu_logical_map[cpu]) { - /* We are online: Enable DAT again and return */ - __load_psw_mask(psw_kernel_bits | PSW_MASK_DAT); - return; - } + for_each_cpu(cpu, mask) + if (pcpu_devices[cpu].address == address) + return pcpu_devices + cpu; + return NULL; +} + +static void pcpu_ec_call(struct pcpu *pcpu, int ec_bit) +{ + int order; + + set_bit(ec_bit, &pcpu->ec_mask); + order = pcpu_running(pcpu) ? + sigp_external_call : sigp_emergency_signal; + pcpu_sigp_retry(pcpu, order, 0); +} + +static int __cpuinit pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu) +{ + struct _lowcore *lc; + + if (pcpu != &pcpu_devices[0]) { + pcpu->lowcore = (struct _lowcore *) + __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER); + pcpu->async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); + pcpu->panic_stack = __get_free_page(GFP_KERNEL); + if (!pcpu->lowcore || !pcpu->panic_stack || !pcpu->async_stack) + goto out; } - /* We are not online: Do PSW restart on an online CPU */ - while (sigp(cpu, sigp_restart) == sigp_busy) - cpu_relax(); - /* And stop ourself */ - while (raw_sigp(stap(), sigp_stop) == sigp_busy) - cpu_relax(); - for (;;); + lc = pcpu->lowcore; + memcpy(lc, &S390_lowcore, 512); + memset((char *) lc + 512, 0, sizeof(*lc) - 512); + lc->async_stack = pcpu->async_stack + ASYNC_SIZE; + lc->panic_stack = pcpu->panic_stack + PAGE_SIZE; + lc->cpu_nr = cpu; +#ifndef CONFIG_64BIT + if (MACHINE_HAS_IEEE) { + lc->extended_save_area_addr = get_zeroed_page(GFP_KERNEL); + if (!lc->extended_save_area_addr) + goto out; + } +#else + if (vdso_alloc_per_cpu(lc)) + goto out; +#endif + lowcore_ptr[cpu] = lc; + pcpu_sigp_retry(pcpu, sigp_set_prefix, (u32)(unsigned long) lc); + return 0; +out: + if (pcpu != &pcpu_devices[0]) { + free_page(pcpu->panic_stack); + free_pages(pcpu->async_stack, ASYNC_ORDER); + free_pages((unsigned long) pcpu->lowcore, LC_ORDER); + } + return -ENOMEM; } -void smp_switch_to_ipl_cpu(void (*func)(void *), void *data) +static void pcpu_free_lowcore(struct pcpu *pcpu) { - struct _lowcore *lc, *current_lc; - struct stack_frame *sf; - struct pt_regs *regs; - unsigned long sp; - - if (smp_processor_id() == 0) - func(data); - __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | - PSW_MASK_EA | PSW_MASK_BA); - /* Disable lowcore protection */ - __ctl_clear_bit(0, 28); - current_lc = lowcore_ptr[smp_processor_id()]; - lc = lowcore_ptr[0]; - if (!lc) - lc = current_lc; - lc->restart_psw.mask = - PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA; - lc->restart_psw.addr = PSW_ADDR_AMODE | (unsigned long) smp_restart_cpu; - if (!cpu_online(0)) - smp_switch_to_cpu(func, data, 0, stap(), __cpu_logical_map[0]); - while (sigp(0, sigp_stop_and_store_status) == sigp_busy) - cpu_relax(); - sp = lc->panic_stack; - sp -= sizeof(struct pt_regs); - regs = (struct pt_regs *) sp; - memcpy(®s->gprs, ¤t_lc->gpregs_save_area, sizeof(regs->gprs)); - regs->psw = current_lc->psw_save_area; - sp -= STACK_FRAME_OVERHEAD; - sf = (struct stack_frame *) sp; - sf->back_chain = 0; - smp_switch_to_cpu(func, data, sp, stap(), __cpu_logical_map[0]); + pcpu_sigp_retry(pcpu, sigp_set_prefix, 0); + lowcore_ptr[pcpu - pcpu_devices] = NULL; +#ifndef CONFIG_64BIT + if (MACHINE_HAS_IEEE) { + struct _lowcore *lc = pcpu->lowcore; + + free_page((unsigned long) lc->extended_save_area_addr); + lc->extended_save_area_addr = 0; + } +#else + vdso_free_per_cpu(pcpu->lowcore); +#endif + if (pcpu != &pcpu_devices[0]) { + free_page(pcpu->panic_stack); + free_pages(pcpu->async_stack, ASYNC_ORDER); + free_pages((unsigned long) pcpu->lowcore, LC_ORDER); + } +} + +static void pcpu_prepare_secondary(struct pcpu *pcpu, int cpu) +{ + struct _lowcore *lc = pcpu->lowcore; + + atomic_inc(&init_mm.context.attach_count); + lc->cpu_nr = cpu; + lc->percpu_offset = __per_cpu_offset[cpu]; + lc->kernel_asce = S390_lowcore.kernel_asce; + lc->machine_flags = S390_lowcore.machine_flags; + lc->ftrace_func = S390_lowcore.ftrace_func; + lc->user_timer = lc->system_timer = lc->steal_timer = 0; + __ctl_store(lc->cregs_save_area, 0, 15); + save_access_regs((unsigned int *) lc->access_regs_save_area); + memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list, + MAX_FACILITY_BIT/8); +} + +static void pcpu_attach_task(struct pcpu *pcpu, struct task_struct *tsk) +{ + struct _lowcore *lc = pcpu->lowcore; + struct thread_info *ti = task_thread_info(tsk); + + lc->kernel_stack = (unsigned long) task_stack_page(tsk) + THREAD_SIZE; + lc->thread_info = (unsigned long) task_thread_info(tsk); + lc->current_task = (unsigned long) tsk; + lc->user_timer = ti->user_timer; + lc->system_timer = ti->system_timer; + lc->steal_timer = 0; +} + +static void pcpu_start_fn(struct pcpu *pcpu, void (*func)(void *), void *data) +{ + struct _lowcore *lc = pcpu->lowcore; + + lc->restart_stack = lc->kernel_stack; + lc->restart_fn = (unsigned long) func; + lc->restart_data = (unsigned long) data; + lc->restart_source = -1UL; + pcpu_sigp_retry(pcpu, sigp_restart, 0); +} + +/* + * Call function via PSW restart on pcpu and stop the current cpu. + */ +static void pcpu_delegate(struct pcpu *pcpu, void (*func)(void *), + void *data, unsigned long stack) +{ + struct _lowcore *lc = pcpu->lowcore; + unsigned short this_cpu; + + __load_psw_mask(psw_kernel_bits); + this_cpu = stap(); + if (pcpu->address == this_cpu) + func(data); /* should not return */ + /* Stop target cpu (if func returns this stops the current cpu). */ + pcpu_sigp_retry(pcpu, sigp_stop, 0); + /* Restart func on the target cpu and stop the current cpu. */ + lc->restart_stack = stack; + lc->restart_fn = (unsigned long) func; + lc->restart_data = (unsigned long) data; + lc->restart_source = (unsigned long) this_cpu; + asm volatile( + "0: sigp 0,%0,6 # sigp restart to target cpu\n" + " brc 2,0b # busy, try again\n" + "1: sigp 0,%1,5 # sigp stop to current cpu\n" + " brc 2,1b # busy, try again\n" + : : "d" (pcpu->address), "d" (this_cpu) : "0", "1", "cc"); + for (;;) ; +} + +/* + * Call function on an online CPU. + */ +void smp_call_online_cpu(void (*func)(void *), void *data) +{ + struct pcpu *pcpu; + + /* Use the current cpu if it is online. */ + pcpu = pcpu_find_address(cpu_online_mask, stap()); + if (!pcpu) + /* Use the first online cpu. */ + pcpu = pcpu_devices + cpumask_first(cpu_online_mask); + pcpu_delegate(pcpu, func, data, (unsigned long) restart_stack); +} + +/* + * Call function on the ipl CPU. + */ +void smp_call_ipl_cpu(void (*func)(void *), void *data) +{ + pcpu_delegate(&pcpu_devices[0], func, data, pcpu_devices->panic_stack); +} + +int smp_find_processor_id(u16 address) +{ + int cpu; + + for_each_present_cpu(cpu) + if (pcpu_devices[cpu].address == address) + return cpu; + return -1; } -static void smp_stop_cpu(void) +int smp_vcpu_scheduled(int cpu) { - while (sigp(smp_processor_id(), sigp_stop) == sigp_busy) + return pcpu_running(pcpu_devices + cpu); +} + +void smp_yield(void) +{ + if (MACHINE_HAS_DIAG44) + asm volatile("diag 0,0,0x44"); +} + +void smp_yield_cpu(int cpu) +{ + if (MACHINE_HAS_DIAG9C) + asm volatile("diag %0,0,0x9c" + : : "d" (pcpu_devices[cpu].address)); + else if (MACHINE_HAS_DIAG44) + asm volatile("diag 0,0,0x44"); +} + +/* + * Send cpus emergency shutdown signal. This gives the cpus the + * opportunity to complete outstanding interrupts. + */ +void smp_emergency_stop(cpumask_t *cpumask) +{ + u64 end; + int cpu; + + end = get_clock() + (1000000UL << 12); + for_each_cpu(cpu, cpumask) { + struct pcpu *pcpu = pcpu_devices + cpu; + set_bit(ec_stop_cpu, &pcpu->ec_mask); + while (__pcpu_sigp(pcpu->address, sigp_emergency_signal, + 0, NULL) == sigp_busy && + get_clock() < end) + cpu_relax(); + } + while (get_clock() < end) { + for_each_cpu(cpu, cpumask) + if (pcpu_stopped(pcpu_devices + cpu)) + cpumask_clear_cpu(cpu, cpumask); + if (cpumask_empty(cpumask)) + break; cpu_relax(); + } } +/* + * Stop all cpus but the current one. + */ void smp_send_stop(void) { cpumask_t cpumask; int cpu; - u64 end; /* Disable all interrupts/machine checks */ __load_psw_mask(psw_kernel_bits | PSW_MASK_DAT); @@ -173,56 +409,46 @@ void smp_send_stop(void) cpumask_copy(&cpumask, cpu_online_mask); cpumask_clear_cpu(smp_processor_id(), &cpumask); - if (oops_in_progress) { - /* - * Give the other cpus the opportunity to complete - * outstanding interrupts before stopping them. - */ - end = get_clock() + (1000000UL << 12); - for_each_cpu(cpu, &cpumask) { - set_bit(ec_stop_cpu, (unsigned long *) - &lowcore_ptr[cpu]->ext_call_fast); - while (sigp(cpu, sigp_emergency_signal) == sigp_busy && - get_clock() < end) - cpu_relax(); - } - while (get_clock() < end) { - for_each_cpu(cpu, &cpumask) - if (cpu_stopped(cpu)) - cpumask_clear_cpu(cpu, &cpumask); - if (cpumask_empty(&cpumask)) - break; - cpu_relax(); - } - } + if (oops_in_progress) + smp_emergency_stop(&cpumask); /* stop all processors */ for_each_cpu(cpu, &cpumask) { - while (sigp(cpu, sigp_stop) == sigp_busy) - cpu_relax(); - while (!cpu_stopped(cpu)) + struct pcpu *pcpu = pcpu_devices + cpu; + pcpu_sigp_retry(pcpu, sigp_stop, 0); + while (!pcpu_stopped(pcpu)) cpu_relax(); } } /* + * Stop the current cpu. + */ +void smp_stop_cpu(void) +{ + pcpu_sigp_retry(pcpu_devices + smp_processor_id(), sigp_stop, 0); + for (;;) ; +} + +/* * This is the main routine where commands issued by other * cpus are handled. */ - static void do_ext_call_interrupt(unsigned int ext_int_code, unsigned int param32, unsigned long param64) { unsigned long bits; + int cpu; + cpu = smp_processor_id(); if ((ext_int_code & 0xffff) == 0x1202) - kstat_cpu(smp_processor_id()).irqs[EXTINT_EXC]++; + kstat_cpu(cpu).irqs[EXTINT_EXC]++; else - kstat_cpu(smp_processor_id()).irqs[EXTINT_EMS]++; + kstat_cpu(cpu).irqs[EXTINT_EMS]++; /* * handle bit signal external calls */ - bits = xchg(&S390_lowcore.ext_call_fast, 0); + bits = xchg(&pcpu_devices[cpu].ec_mask, 0); if (test_bit(ec_stop_cpu, &bits)) smp_stop_cpu(); @@ -238,38 +464,17 @@ static void do_ext_call_interrupt(unsigned int ext_int_code, } -/* - * Send an external call sigp to another cpu and return without waiting - * for its completion. - */ -static void smp_ext_bitcall(int cpu, int sig) -{ - int order; - - /* - * Set signaling bit in lowcore of target cpu and kick it - */ - set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); - while (1) { - order = smp_vcpu_scheduled(cpu) ? - sigp_external_call : sigp_emergency_signal; - if (sigp(cpu, order) != sigp_busy) - break; - udelay(10); - } -} - void arch_send_call_function_ipi_mask(const struct cpumask *mask) { int cpu; for_each_cpu(cpu, mask) - smp_ext_bitcall(cpu, ec_call_function); + pcpu_ec_call(pcpu_devices + cpu, ec_call_function); } void arch_send_call_function_single_ipi(int cpu) { - smp_ext_bitcall(cpu, ec_call_function_single); + pcpu_ec_call(pcpu_devices + cpu, ec_call_function_single); } #ifndef CONFIG_64BIT @@ -295,15 +500,16 @@ EXPORT_SYMBOL(smp_ptlb_all); */ void smp_send_reschedule(int cpu) { - smp_ext_bitcall(cpu, ec_schedule); + pcpu_ec_call(pcpu_devices + cpu, ec_schedule); } /* * parameter area for the set/clear control bit callbacks */ struct ec_creg_mask_parms { - unsigned long orvals[16]; - unsigned long andvals[16]; + unsigned long orval; + unsigned long andval; + int cr; }; /* @@ -313,11 +519,9 @@ static void smp_ctl_bit_callback(void *info) { struct ec_creg_mask_parms *pp = info; unsigned long cregs[16]; - int i; __ctl_store(cregs, 0, 15); - for (i = 0; i <= 15; i++) - cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i]; + cregs[pp->cr] = (cregs[pp->cr] & pp->andval) | pp->orval; __ctl_load(cregs, 0, 15); } @@ -326,11 +530,8 @@ static void smp_ctl_bit_callback(void *info) */ void smp_ctl_set_bit(int cr, int bit) { - struct ec_creg_mask_parms parms; + struct ec_creg_mask_parms parms = { 1UL << bit, -1UL, cr }; - memset(&parms.orvals, 0, sizeof(parms.orvals)); - memset(&parms.andvals, 0xff, sizeof(parms.andvals)); - parms.orvals[cr] = 1UL << bit; on_each_cpu(smp_ctl_bit_callback, &parms, 1); } EXPORT_SYMBOL(smp_ctl_set_bit); @@ -340,216 +541,175 @@ EXPORT_SYMBOL(smp_ctl_set_bit); */ void smp_ctl_clear_bit(int cr, int bit) { - struct ec_creg_mask_parms parms; + struct ec_creg_mask_parms parms = { 0, ~(1UL << bit), cr }; - memset(&parms.orvals, 0, sizeof(parms.orvals)); - memset(&parms.andvals, 0xff, sizeof(parms.andvals)); - parms.andvals[cr] = ~(1UL << bit); on_each_cpu(smp_ctl_bit_callback, &parms, 1); } EXPORT_SYMBOL(smp_ctl_clear_bit); #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_CRASH_DUMP) -static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) +struct save_area *zfcpdump_save_areas[NR_CPUS + 1]; +EXPORT_SYMBOL_GPL(zfcpdump_save_areas); + +static void __init smp_get_save_area(int cpu, u16 address) { - if (ipl_info.type != IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) - return; + void *lc = pcpu_devices[0].lowcore; + struct save_area *save_area; + if (is_kdump_kernel()) return; + if (!OLDMEM_BASE && (address == boot_cpu_address || + ipl_info.type != IPL_TYPE_FCP_DUMP)) + return; if (cpu >= NR_CPUS) { - pr_warning("CPU %i exceeds the maximum %i and is excluded from " - "the dump\n", cpu, NR_CPUS - 1); + pr_warning("CPU %i exceeds the maximum %i and is excluded " + "from the dump\n", cpu, NR_CPUS - 1); return; } - zfcpdump_save_areas[cpu] = kmalloc(sizeof(struct save_area), GFP_KERNEL); - while (raw_sigp(phy_cpu, sigp_stop_and_store_status) == sigp_busy) - cpu_relax(); - memcpy_real(zfcpdump_save_areas[cpu], - (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE, - sizeof(struct save_area)); + save_area = kmalloc(sizeof(struct save_area), GFP_KERNEL); + if (!save_area) + panic("could not allocate memory for save area\n"); + zfcpdump_save_areas[cpu] = save_area; +#ifdef CONFIG_CRASH_DUMP + if (address == boot_cpu_address) { + /* Copy the registers of the boot cpu. */ + copy_oldmem_page(1, (void *) save_area, sizeof(*save_area), + SAVE_AREA_BASE - PAGE_SIZE, 0); + return; + } +#endif + /* Get the registers of a non-boot cpu. */ + __pcpu_sigp_relax(address, sigp_stop_and_store_status, 0, NULL); + memcpy_real(save_area, lc + SAVE_AREA_BASE, sizeof(*save_area)); } -struct save_area *zfcpdump_save_areas[NR_CPUS + 1]; -EXPORT_SYMBOL_GPL(zfcpdump_save_areas); - -#else - -static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { } - -#endif /* CONFIG_ZFCPDUMP */ - -static int cpu_known(int cpu_id) +int smp_store_status(int cpu) { - int cpu; + struct pcpu *pcpu; - for_each_present_cpu(cpu) { - if (__cpu_logical_map[cpu] == cpu_id) - return 1; - } + pcpu = pcpu_devices + cpu; + if (__pcpu_sigp_relax(pcpu->address, sigp_stop_and_store_status, + 0, NULL) != sigp_order_code_accepted) + return -EIO; return 0; } -static int smp_rescan_cpus_sigp(cpumask_t avail) -{ - int cpu_id, logical_cpu; +#else /* CONFIG_ZFCPDUMP || CONFIG_CRASH_DUMP */ - logical_cpu = cpumask_first(&avail); - if (logical_cpu >= nr_cpu_ids) - return 0; - for (cpu_id = 0; cpu_id <= MAX_CPU_ADDRESS; cpu_id++) { - if (cpu_known(cpu_id)) - continue; - __cpu_logical_map[logical_cpu] = cpu_id; - cpu_set_polarization(logical_cpu, POLARIZATION_UNKNOWN); - if (!cpu_stopped(logical_cpu)) - continue; - set_cpu_present(logical_cpu, true); - smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; - logical_cpu = cpumask_next(logical_cpu, &avail); - if (logical_cpu >= nr_cpu_ids) - break; - } - return 0; -} +static inline void smp_get_save_area(int cpu, u16 address) { } + +#endif /* CONFIG_ZFCPDUMP || CONFIG_CRASH_DUMP */ -static int smp_rescan_cpus_sclp(cpumask_t avail) +static struct sclp_cpu_info *smp_get_cpu_info(void) { + static int use_sigp_detection; struct sclp_cpu_info *info; - int cpu_id, logical_cpu, cpu; - int rc; - - logical_cpu = cpumask_first(&avail); - if (logical_cpu >= nr_cpu_ids) - return 0; - info = kmalloc(sizeof(*info), GFP_KERNEL); - if (!info) - return -ENOMEM; - rc = sclp_get_cpu_info(info); - if (rc) - goto out; - for (cpu = 0; cpu < info->combined; cpu++) { - if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) - continue; - cpu_id = info->cpu[cpu].address; - if (cpu_known(cpu_id)) - continue; - __cpu_logical_map[logical_cpu] = cpu_id; - cpu_set_polarization(logical_cpu, POLARIZATION_UNKNOWN); - set_cpu_present(logical_cpu, true); - if (cpu >= info->configured) - smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY; - else - smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; - logical_cpu = cpumask_next(logical_cpu, &avail); - if (logical_cpu >= nr_cpu_ids) - break; + int address; + + info = kzalloc(sizeof(*info), GFP_KERNEL); + if (info && (use_sigp_detection || sclp_get_cpu_info(info))) { + use_sigp_detection = 1; + for (address = 0; address <= MAX_CPU_ADDRESS; address++) { + if (__pcpu_sigp_relax(address, sigp_sense, 0, NULL) == + sigp_not_operational) + continue; + info->cpu[info->configured].address = address; + info->configured++; + } + info->combined = info->configured; } -out: - kfree(info); - return rc; + return info; } -static int __smp_rescan_cpus(void) +static int __devinit smp_add_present_cpu(int cpu); + +static int __devinit __smp_rescan_cpus(struct sclp_cpu_info *info, + int sysfs_add) { + struct pcpu *pcpu; cpumask_t avail; + int cpu, nr, i; + nr = 0; cpumask_xor(&avail, cpu_possible_mask, cpu_present_mask); - if (smp_use_sigp_detection) - return smp_rescan_cpus_sigp(avail); - else - return smp_rescan_cpus_sclp(avail); + cpu = cpumask_first(&avail); + for (i = 0; (i < info->combined) && (cpu < nr_cpu_ids); i++) { + if (info->has_cpu_type && info->cpu[i].type != boot_cpu_type) + continue; + if (pcpu_find_address(cpu_present_mask, info->cpu[i].address)) + continue; + pcpu = pcpu_devices + cpu; + pcpu->address = info->cpu[i].address; + pcpu->state = (cpu >= info->configured) ? + CPU_STATE_STANDBY : CPU_STATE_CONFIGURED; + cpu_set_polarization(cpu, POLARIZATION_UNKNOWN); + set_cpu_present(cpu, true); + if (sysfs_add && smp_add_present_cpu(cpu) != 0) + set_cpu_present(cpu, false); + else + nr++; + cpu = cpumask_next(cpu, &avail); + } + return nr; } static void __init smp_detect_cpus(void) { unsigned int cpu, c_cpus, s_cpus; struct sclp_cpu_info *info; - u16 boot_cpu_addr, cpu_addr; - c_cpus = 1; - s_cpus = 0; - boot_cpu_addr = __cpu_logical_map[0]; - info = kmalloc(sizeof(*info), GFP_KERNEL); + info = smp_get_cpu_info(); if (!info) panic("smp_detect_cpus failed to allocate memory\n"); -#ifdef CONFIG_CRASH_DUMP - if (OLDMEM_BASE && !is_kdump_kernel()) { - struct save_area *save_area; - - save_area = kmalloc(sizeof(*save_area), GFP_KERNEL); - if (!save_area) - panic("could not allocate memory for save area\n"); - copy_oldmem_page(1, (void *) save_area, sizeof(*save_area), - 0x200, 0); - zfcpdump_save_areas[0] = save_area; - } -#endif - /* Use sigp detection algorithm if sclp doesn't work. */ - if (sclp_get_cpu_info(info)) { - smp_use_sigp_detection = 1; - for (cpu = 0; cpu <= MAX_CPU_ADDRESS; cpu++) { - if (cpu == boot_cpu_addr) - continue; - if (!raw_cpu_stopped(cpu)) - continue; - smp_get_save_area(c_cpus, cpu); - c_cpus++; - } - goto out; - } - if (info->has_cpu_type) { for (cpu = 0; cpu < info->combined; cpu++) { - if (info->cpu[cpu].address == boot_cpu_addr) { - smp_cpu_type = info->cpu[cpu].type; - break; - } + if (info->cpu[cpu].address != boot_cpu_address) + continue; + /* The boot cpu dictates the cpu type. */ + boot_cpu_type = info->cpu[cpu].type; + break; } } - + c_cpus = s_cpus = 0; for (cpu = 0; cpu < info->combined; cpu++) { - if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) + if (info->has_cpu_type && info->cpu[cpu].type != boot_cpu_type) continue; - cpu_addr = info->cpu[cpu].address; - if (cpu_addr == boot_cpu_addr) - continue; - if (!raw_cpu_stopped(cpu_addr)) { + if (cpu < info->configured) { + smp_get_save_area(c_cpus, info->cpu[cpu].address); + c_cpus++; + } else s_cpus++; - continue; - } - smp_get_save_area(c_cpus, cpu_addr); - c_cpus++; } -out: - kfree(info); pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus, s_cpus); get_online_cpus(); - __smp_rescan_cpus(); + __smp_rescan_cpus(info, 0); put_online_cpus(); + kfree(info); } /* * Activate a secondary processor. */ -int __cpuinit start_secondary(void *cpuvoid) +static void __cpuinit smp_start_secondary(void *cpuvoid) { + S390_lowcore.last_update_clock = get_clock(); + S390_lowcore.restart_stack = (unsigned long) restart_stack; + S390_lowcore.restart_fn = (unsigned long) do_restart; + S390_lowcore.restart_data = 0; + S390_lowcore.restart_source = -1UL; + restore_access_regs(S390_lowcore.access_regs_save_area); + __ctl_load(S390_lowcore.cregs_save_area, 0, 15); + __load_psw_mask(psw_kernel_bits | PSW_MASK_DAT); cpu_init(); preempt_disable(); init_cpu_timer(); init_cpu_vtimer(); pfault_init(); - notify_cpu_starting(smp_processor_id()); ipi_call_lock(); set_cpu_online(smp_processor_id(), true); ipi_call_unlock(); - __ctl_clear_bit(0, 28); /* Disable lowcore protection */ - S390_lowcore.restart_psw.mask = - PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA; - S390_lowcore.restart_psw.addr = - PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler; - __ctl_set_bit(0, 28); /* Enable lowcore protection */ /* * Wait until the cpu which brought this one up marked it * active before enabling interrupts. @@ -559,7 +719,6 @@ int __cpuinit start_secondary(void *cpuvoid) local_irq_enable(); /* cpu_idle will call schedule for us */ cpu_idle(); - return 0; } struct create_idle { @@ -578,82 +737,20 @@ static void __cpuinit smp_fork_idle(struct work_struct *work) complete(&c_idle->done); } -static int __cpuinit smp_alloc_lowcore(int cpu) -{ - unsigned long async_stack, panic_stack; - struct _lowcore *lowcore; - - lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER); - if (!lowcore) - return -ENOMEM; - async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); - panic_stack = __get_free_page(GFP_KERNEL); - if (!panic_stack || !async_stack) - goto out; - memcpy(lowcore, &S390_lowcore, 512); - memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512); - lowcore->async_stack = async_stack + ASYNC_SIZE; - lowcore->panic_stack = panic_stack + PAGE_SIZE; - lowcore->restart_psw.mask = - PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA; - lowcore->restart_psw.addr = - PSW_ADDR_AMODE | (unsigned long) restart_int_handler; - if (user_mode != HOME_SPACE_MODE) - lowcore->restart_psw.mask |= PSW_ASC_HOME; -#ifndef CONFIG_64BIT - if (MACHINE_HAS_IEEE) { - unsigned long save_area; - - save_area = get_zeroed_page(GFP_KERNEL); - if (!save_area) - goto out; - lowcore->extended_save_area_addr = (u32) save_area; - } -#else - if (vdso_alloc_per_cpu(cpu, lowcore)) - goto out; -#endif - lowcore_ptr[cpu] = lowcore; - return 0; - -out: - free_page(panic_stack); - free_pages(async_stack, ASYNC_ORDER); - free_pages((unsigned long) lowcore, LC_ORDER); - return -ENOMEM; -} - -static void smp_free_lowcore(int cpu) -{ - struct _lowcore *lowcore; - - lowcore = lowcore_ptr[cpu]; -#ifndef CONFIG_64BIT - if (MACHINE_HAS_IEEE) - free_page((unsigned long) lowcore->extended_save_area_addr); -#else - vdso_free_per_cpu(cpu, lowcore); -#endif - free_page(lowcore->panic_stack - PAGE_SIZE); - free_pages(lowcore->async_stack - ASYNC_SIZE, ASYNC_ORDER); - free_pages((unsigned long) lowcore, LC_ORDER); - lowcore_ptr[cpu] = NULL; -} - /* Upping and downing of CPUs */ int __cpuinit __cpu_up(unsigned int cpu) { - struct _lowcore *cpu_lowcore; struct create_idle c_idle; - struct task_struct *idle; - struct stack_frame *sf; - u32 lowcore; - int ccode; + struct pcpu *pcpu; + int rc; - if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED) + pcpu = pcpu_devices + cpu; + if (pcpu->state != CPU_STATE_CONFIGURED) return -EIO; - idle = current_set[cpu]; - if (!idle) { + if (pcpu_sigp_retry(pcpu, sigp_initial_cpu_reset, 0) != + sigp_order_code_accepted) + return -EIO; + if (!pcpu->idle) { c_idle.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done); INIT_WORK_ONSTACK(&c_idle.work, smp_fork_idle); c_idle.cpu = cpu; @@ -661,68 +758,28 @@ int __cpuinit __cpu_up(unsigned int cpu) wait_for_completion(&c_idle.done); if (IS_ERR(c_idle.idle)) return PTR_ERR(c_idle.idle); - idle = c_idle.idle; - current_set[cpu] = c_idle.idle; + pcpu->idle = c_idle.idle; } - init_idle(idle, cpu); - if (smp_alloc_lowcore(cpu)) - return -ENOMEM; - do { - ccode = sigp(cpu, sigp_initial_cpu_reset); - if (ccode == sigp_busy) - udelay(10); - if (ccode == sigp_not_operational) - goto err_out; - } while (ccode == sigp_busy); - - lowcore = (u32)(unsigned long)lowcore_ptr[cpu]; - while (sigp_p(lowcore, cpu, sigp_set_prefix) == sigp_busy) - udelay(10); - - cpu_lowcore = lowcore_ptr[cpu]; - cpu_lowcore->kernel_stack = (unsigned long) - task_stack_page(idle) + THREAD_SIZE; - cpu_lowcore->thread_info = (unsigned long) task_thread_info(idle); - sf = (struct stack_frame *) (cpu_lowcore->kernel_stack - - sizeof(struct pt_regs) - - sizeof(struct stack_frame)); - memset(sf, 0, sizeof(struct stack_frame)); - sf->gprs[9] = (unsigned long) sf; - cpu_lowcore->gpregs_save_area[15] = (unsigned long) sf; - __ctl_store(cpu_lowcore->cregs_save_area, 0, 15); - atomic_inc(&init_mm.context.attach_count); - asm volatile( - " stam 0,15,0(%0)" - : : "a" (&cpu_lowcore->access_regs_save_area) : "memory"); - cpu_lowcore->percpu_offset = __per_cpu_offset[cpu]; - cpu_lowcore->current_task = (unsigned long) idle; - cpu_lowcore->cpu_nr = cpu; - cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce; - cpu_lowcore->machine_flags = S390_lowcore.machine_flags; - cpu_lowcore->ftrace_func = S390_lowcore.ftrace_func; - memcpy(cpu_lowcore->stfle_fac_list, S390_lowcore.stfle_fac_list, - MAX_FACILITY_BIT/8); - eieio(); - - while (sigp(cpu, sigp_restart) == sigp_busy) - udelay(10); - + init_idle(pcpu->idle, cpu); + rc = pcpu_alloc_lowcore(pcpu, cpu); + if (rc) + return rc; + pcpu_prepare_secondary(pcpu, cpu); + pcpu_attach_task(pcpu, pcpu->idle); + pcpu_start_fn(pcpu, smp_start_secondary, NULL); while (!cpu_online(cpu)) cpu_relax(); return 0; - -err_out: - smp_free_lowcore(cpu); - return -EIO; } static int __init setup_possible_cpus(char *s) { - int pcpus, cpu; + int max, cpu; - pcpus = simple_strtoul(s, NULL, 0); + if (kstrtoint(s, 0, &max) < 0) + return 0; init_cpu_possible(cpumask_of(0)); - for (cpu = 1; cpu < pcpus && cpu < nr_cpu_ids; cpu++) + for (cpu = 1; cpu < max && cpu < nr_cpu_ids; cpu++) set_cpu_possible(cpu, true); return 0; } @@ -732,113 +789,67 @@ early_param("possible_cpus", setup_possible_cpus); int __cpu_disable(void) { - struct ec_creg_mask_parms cr_parms; - int cpu = smp_processor_id(); - - set_cpu_online(cpu, false); + unsigned long cregs[16]; - /* Disable pfault pseudo page faults on this cpu. */ + set_cpu_online(smp_processor_id(), false); + /* Disable pseudo page faults on this cpu. */ pfault_fini(); - - memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals)); - memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals)); - - /* disable all external interrupts */ - cr_parms.orvals[0] = 0; - cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 11 | - 1 << 10 | 1 << 9 | 1 << 6 | 1 << 5 | - 1 << 4); - /* disable all I/O interrupts */ - cr_parms.orvals[6] = 0; - cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 | - 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24); - /* disable most machine checks */ - cr_parms.orvals[14] = 0; - cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 | - 1 << 25 | 1 << 24); - - smp_ctl_bit_callback(&cr_parms); - + /* Disable interrupt sources via control register. */ + __ctl_store(cregs, 0, 15); + cregs[0] &= ~0x0000ee70UL; /* disable all external interrupts */ + cregs[6] &= ~0xff000000UL; /* disable all I/O interrupts */ + cregs[14] &= ~0x1f000000UL; /* disable most machine checks */ + __ctl_load(cregs, 0, 15); return 0; } void __cpu_die(unsigned int cpu) { + struct pcpu *pcpu; + /* Wait until target cpu is down */ - while (!cpu_stopped(cpu)) + pcpu = pcpu_devices + cpu; + while (!pcpu_stopped(pcpu)) cpu_relax(); - while (sigp_p(0, cpu, sigp_set_prefix) == sigp_busy) - udelay(10); - smp_free_lowcore(cpu); + pcpu_free_lowcore(pcpu); atomic_dec(&init_mm.context.attach_count); } void __noreturn cpu_die(void) { idle_task_exit(); - while (sigp(smp_processor_id(), sigp_stop) == sigp_busy) - cpu_relax(); - for (;;); + pcpu_sigp_retry(pcpu_devices + smp_processor_id(), sigp_stop, 0); + for (;;) ; } #endif /* CONFIG_HOTPLUG_CPU */ void __init smp_prepare_cpus(unsigned int max_cpus) { -#ifndef CONFIG_64BIT - unsigned long save_area = 0; -#endif - unsigned long async_stack, panic_stack; - struct _lowcore *lowcore; - - smp_detect_cpus(); - /* request the 0x1201 emergency signal external interrupt */ if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) panic("Couldn't request external interrupt 0x1201"); /* request the 0x1202 external call external interrupt */ if (register_external_interrupt(0x1202, do_ext_call_interrupt) != 0) panic("Couldn't request external interrupt 0x1202"); - - /* Reallocate current lowcore, but keep its contents. */ - lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER); - panic_stack = __get_free_page(GFP_KERNEL); - async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); - BUG_ON(!lowcore || !panic_stack || !async_stack); -#ifndef CONFIG_64BIT - if (MACHINE_HAS_IEEE) - save_area = get_zeroed_page(GFP_KERNEL); -#endif - local_irq_disable(); - local_mcck_disable(); - lowcore_ptr[smp_processor_id()] = lowcore; - *lowcore = S390_lowcore; - lowcore->panic_stack = panic_stack + PAGE_SIZE; - lowcore->async_stack = async_stack + ASYNC_SIZE; -#ifndef CONFIG_64BIT - if (MACHINE_HAS_IEEE) - lowcore->extended_save_area_addr = (u32) save_area; -#endif - set_prefix((u32)(unsigned long) lowcore); - local_mcck_enable(); - local_irq_enable(); -#ifdef CONFIG_64BIT - if (vdso_alloc_per_cpu(smp_processor_id(), &S390_lowcore)) - BUG(); -#endif + smp_detect_cpus(); } void __init smp_prepare_boot_cpu(void) { - BUG_ON(smp_processor_id() != 0); - - current_thread_info()->cpu = 0; - set_cpu_present(0, true); - set_cpu_online(0, true); + struct pcpu *pcpu = pcpu_devices; + + boot_cpu_address = stap(); + pcpu->idle = current; + pcpu->state = CPU_STATE_CONFIGURED; + pcpu->address = boot_cpu_address; + pcpu->lowcore = (struct _lowcore *)(unsigned long) store_prefix(); + pcpu->async_stack = S390_lowcore.async_stack - ASYNC_SIZE; + pcpu->panic_stack = S390_lowcore.panic_stack - PAGE_SIZE; S390_lowcore.percpu_offset = __per_cpu_offset[0]; - current_set[0] = current; - smp_cpu_state[0] = CPU_STATE_CONFIGURED; cpu_set_polarization(0, POLARIZATION_UNKNOWN); + set_cpu_present(0, true); + set_cpu_online(0, true); } void __init smp_cpus_done(unsigned int max_cpus) @@ -848,7 +859,6 @@ void __init smp_cpus_done(unsigned int max_cpus) void __init smp_setup_processor_id(void) { S390_lowcore.cpu_nr = 0; - __cpu_logical_map[0] = stap(); } /* @@ -864,56 +874,57 @@ int setup_profiling_timer(unsigned int multiplier) #ifdef CONFIG_HOTPLUG_CPU static ssize_t cpu_configure_show(struct device *dev, - struct device_attribute *attr, char *buf) + struct device_attribute *attr, char *buf) { ssize_t count; mutex_lock(&smp_cpu_state_mutex); - count = sprintf(buf, "%d\n", smp_cpu_state[dev->id]); + count = sprintf(buf, "%d\n", pcpu_devices[dev->id].state); mutex_unlock(&smp_cpu_state_mutex); return count; } static ssize_t cpu_configure_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) + struct device_attribute *attr, + const char *buf, size_t count) { - int cpu = dev->id; - int val, rc; + struct pcpu *pcpu; + int cpu, val, rc; char delim; if (sscanf(buf, "%d %c", &val, &delim) != 1) return -EINVAL; if (val != 0 && val != 1) return -EINVAL; - get_online_cpus(); mutex_lock(&smp_cpu_state_mutex); rc = -EBUSY; /* disallow configuration changes of online cpus and cpu 0 */ + cpu = dev->id; if (cpu_online(cpu) || cpu == 0) goto out; + pcpu = pcpu_devices + cpu; rc = 0; switch (val) { case 0: - if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) { - rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]); - if (!rc) { - smp_cpu_state[cpu] = CPU_STATE_STANDBY; - cpu_set_polarization(cpu, POLARIZATION_UNKNOWN); - topology_expect_change(); - } - } + if (pcpu->state != CPU_STATE_CONFIGURED) + break; + rc = sclp_cpu_deconfigure(pcpu->address); + if (rc) + break; + pcpu->state = CPU_STATE_STANDBY; + cpu_set_polarization(cpu, POLARIZATION_UNKNOWN); + topology_expect_change(); break; case 1: - if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) { - rc = sclp_cpu_configure(__cpu_logical_map[cpu]); - if (!rc) { - smp_cpu_state[cpu] = CPU_STATE_CONFIGURED; - cpu_set_polarization(cpu, POLARIZATION_UNKNOWN); - topology_expect_change(); - } - } + if (pcpu->state != CPU_STATE_STANDBY) + break; + rc = sclp_cpu_configure(pcpu->address); + if (rc) + break; + pcpu->state = CPU_STATE_CONFIGURED; + cpu_set_polarization(cpu, POLARIZATION_UNKNOWN); + topology_expect_change(); break; default: break; @@ -929,7 +940,7 @@ static DEVICE_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store); static ssize_t show_cpu_address(struct device *dev, struct device_attribute *attr, char *buf) { - return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]); + return sprintf(buf, "%d\n", pcpu_devices[dev->id].address); } static DEVICE_ATTR(address, 0444, show_cpu_address, NULL); @@ -1021,7 +1032,7 @@ static int __cpuinit smp_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu) { unsigned int cpu = (unsigned int)(long)hcpu; - struct cpu *c = &per_cpu(cpu_devices, cpu); + struct cpu *c = &pcpu_devices[cpu].cpu; struct device *s = &c->dev; struct s390_idle_data *idle; int err = 0; @@ -1047,7 +1058,7 @@ static struct notifier_block __cpuinitdata smp_cpu_nb = { static int __devinit smp_add_present_cpu(int cpu) { - struct cpu *c = &per_cpu(cpu_devices, cpu); + struct cpu *c = &pcpu_devices[cpu].cpu; struct device *s = &c->dev; int rc; @@ -1085,29 +1096,21 @@ out: int __ref smp_rescan_cpus(void) { - cpumask_t newcpus; - int cpu; - int rc; + struct sclp_cpu_info *info; + int nr; + info = smp_get_cpu_info(); + if (!info) + return -ENOMEM; get_online_cpus(); mutex_lock(&smp_cpu_state_mutex); - cpumask_copy(&newcpus, cpu_present_mask); - rc = __smp_rescan_cpus(); - if (rc) - goto out; - cpumask_andnot(&newcpus, cpu_present_mask, &newcpus); - for_each_cpu(cpu, &newcpus) { - rc = smp_add_present_cpu(cpu); - if (rc) - set_cpu_present(cpu, false); - } - rc = 0; -out: + nr = __smp_rescan_cpus(info, 1); mutex_unlock(&smp_cpu_state_mutex); put_online_cpus(); - if (!cpumask_empty(&newcpus)) + kfree(info); + if (nr) topology_schedule_update(); - return rc; + return 0; } static ssize_t __ref rescan_store(struct device *dev, diff --git a/arch/s390/kernel/switch_cpu.S b/arch/s390/kernel/switch_cpu.S deleted file mode 100644 index bfe070b..0000000 --- a/arch/s390/kernel/switch_cpu.S +++ /dev/null @@ -1,58 +0,0 @@ -/* - * 31-bit switch cpu code - * - * Copyright IBM Corp. 2009 - * - */ - -#include -#include -#include - -# smp_switch_to_cpu switches to destination cpu and executes the passed function -# Parameter: %r2 - function to call -# %r3 - function parameter -# %r4 - stack poiner -# %r5 - current cpu -# %r6 - destination cpu - - .section .text -ENTRY(smp_switch_to_cpu) - stm %r6,%r15,__SF_GPRS(%r15) - lr %r1,%r15 - ahi %r15,-STACK_FRAME_OVERHEAD - st %r1,__SF_BACKCHAIN(%r15) - basr %r13,0 -0: la %r1,.gprregs_addr-0b(%r13) - l %r1,0(%r1) - stm %r0,%r15,0(%r1) -1: sigp %r0,%r6,__SIGP_RESTART /* start destination CPU */ - brc 2,1b /* busy, try again */ -2: sigp %r0,%r5,__SIGP_STOP /* stop current CPU */ - brc 2,2b /* busy, try again */ -3: j 3b - -ENTRY(smp_restart_cpu) - basr %r13,0 -0: la %r1,.gprregs_addr-0b(%r13) - l %r1,0(%r1) - lm %r0,%r15,0(%r1) -1: sigp %r0,%r5,__SIGP_SENSE /* Wait for calling CPU */ - brc 10,1b /* busy, accepted (status 0), running */ - tmll %r0,0x40 /* Test if calling CPU is stopped */ - jz 1b - ltr %r4,%r4 /* New stack ? */ - jz 1f - lr %r15,%r4 -1: lr %r14,%r2 /* r14: Function to call */ - lr %r2,%r3 /* r2 : Parameter for function*/ - basr %r14,%r14 /* Call function */ - -.gprregs_addr: - .long .gprregs - - .section .data,"aw",@progbits -.gprregs: - .rept 16 - .long 0 - .endr diff --git a/arch/s390/kernel/switch_cpu64.S b/arch/s390/kernel/switch_cpu64.S deleted file mode 100644 index fcc42d7..0000000 --- a/arch/s390/kernel/switch_cpu64.S +++ /dev/null @@ -1,51 +0,0 @@ -/* - * 64-bit switch cpu code - * - * Copyright IBM Corp. 2009 - * - */ - -#include -#include -#include - -# smp_switch_to_cpu switches to destination cpu and executes the passed function -# Parameter: %r2 - function to call -# %r3 - function parameter -# %r4 - stack poiner -# %r5 - current cpu -# %r6 - destination cpu - - .section .text -ENTRY(smp_switch_to_cpu) - stmg %r6,%r15,__SF_GPRS(%r15) - lgr %r1,%r15 - aghi %r15,-STACK_FRAME_OVERHEAD - stg %r1,__SF_BACKCHAIN(%r15) - larl %r1,.gprregs - stmg %r0,%r15,0(%r1) -1: sigp %r0,%r6,__SIGP_RESTART /* start destination CPU */ - brc 2,1b /* busy, try again */ -2: sigp %r0,%r5,__SIGP_STOP /* stop current CPU */ - brc 2,2b /* busy, try again */ -3: j 3b - -ENTRY(smp_restart_cpu) - larl %r1,.gprregs - lmg %r0,%r15,0(%r1) -1: sigp %r0,%r5,__SIGP_SENSE /* Wait for calling CPU */ - brc 10,1b /* busy, accepted (status 0), running */ - tmll %r0,0x40 /* Test if calling CPU is stopped */ - jz 1b - ltgr %r4,%r4 /* New stack ? */ - jz 1f - lgr %r15,%r4 -1: lgr %r14,%r2 /* r14: Function to call */ - lgr %r2,%r3 /* r2 : Parameter for function*/ - basr %r14,%r14 /* Call function */ - - .section .data,"aw",@progbits -.gprregs: - .rept 16 - .quad 0 - .endr diff --git a/arch/s390/kernel/swsusp_asm64.S b/arch/s390/kernel/swsusp_asm64.S index 2ef39d1..ad3c79e 100644 --- a/arch/s390/kernel/swsusp_asm64.S +++ b/arch/s390/kernel/swsusp_asm64.S @@ -179,9 +179,9 @@ pgm_check_entry: larl %r4,.Lrestart_suspend_psw /* Set new restart PSW */ mvc __LC_RST_NEW_PSW(16,%r0),0(%r4) 3: - sigp %r9,%r1,__SIGP_INITIAL_CPU_RESET - brc 8,4f /* accepted */ - brc 2,3b /* busy, try again */ + sigp %r9,%r1,11 /* sigp initial cpu reset */ + brc 8,4f /* accepted */ + brc 2,3b /* busy, try again */ /* Suspend CPU not available -> panic */ larl %r15,init_thread_union @@ -196,10 +196,10 @@ pgm_check_entry: lpsw 0(%r3) 4: /* Switch to suspend CPU */ - sigp %r9,%r1,__SIGP_RESTART /* start suspend CPU */ + sigp %r9,%r1,6 /* sigp restart to suspend CPU */ brc 2,4b /* busy, try again */ 5: - sigp %r9,%r2,__SIGP_STOP /* stop resume (current) CPU */ + sigp %r9,%r2,5 /* sigp stop to current resume CPU */ brc 2,5b /* busy, try again */ 6: j 6b @@ -207,7 +207,7 @@ restart_suspend: larl %r1,.Lresume_cpu llgh %r2,0(%r1) 7: - sigp %r9,%r2,__SIGP_SENSE /* Wait for resume CPU */ + sigp %r9,%r2,1 /* sigp sense, wait for resume CPU */ brc 8,7b /* accepted, status 0, still running */ brc 2,7b /* busy, try again */ tmll %r9,0x40 /* Test if resume CPU is stopped */ diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c index 7370a41..4f8dc94 100644 --- a/arch/s390/kernel/topology.c +++ b/arch/s390/kernel/topology.c @@ -79,12 +79,12 @@ static struct mask_info *add_cpus_to_mask(struct topology_cpu *tl_cpu, cpu < TOPOLOGY_CPU_BITS; cpu = find_next_bit(&tl_cpu->mask[0], TOPOLOGY_CPU_BITS, cpu + 1)) { - unsigned int rcpu, lcpu; + unsigned int rcpu; + int lcpu; rcpu = TOPOLOGY_CPU_BITS - 1 - cpu + tl_cpu->origin; - for_each_present_cpu(lcpu) { - if (cpu_logical_map(lcpu) != rcpu) - continue; + lcpu = smp_find_processor_id(rcpu); + if (lcpu >= 0) { cpumask_set_cpu(lcpu, &book->mask); cpu_book_id[lcpu] = book->id; cpumask_set_cpu(lcpu, &core->mask); diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c index d73630b..e704a99 100644 --- a/arch/s390/kernel/vdso.c +++ b/arch/s390/kernel/vdso.c @@ -89,18 +89,11 @@ static void vdso_init_data(struct vdso_data *vd) #ifdef CONFIG_64BIT /* - * Setup per cpu vdso data page. - */ -static void vdso_init_per_cpu_data(int cpu, struct vdso_per_cpu_data *vpcd) -{ -} - -/* * Allocate/free per cpu vdso data. */ #define SEGMENT_ORDER 2 -int vdso_alloc_per_cpu(int cpu, struct _lowcore *lowcore) +int vdso_alloc_per_cpu(struct _lowcore *lowcore) { unsigned long segment_table, page_table, page_frame; u32 *psal, *aste; @@ -139,7 +132,6 @@ int vdso_alloc_per_cpu(int cpu, struct _lowcore *lowcore) aste[4] = (u32)(addr_t) psal; lowcore->vdso_per_cpu_data = page_frame; - vdso_init_per_cpu_data(cpu, (struct vdso_per_cpu_data *) page_frame); return 0; out: @@ -149,7 +141,7 @@ out: return -ENOMEM; } -void vdso_free_per_cpu(int cpu, struct _lowcore *lowcore) +void vdso_free_per_cpu(struct _lowcore *lowcore) { unsigned long segment_table, page_table, page_frame; u32 *psal, *aste; @@ -168,19 +160,15 @@ void vdso_free_per_cpu(int cpu, struct _lowcore *lowcore) free_pages(segment_table, SEGMENT_ORDER); } -static void __vdso_init_cr5(void *dummy) +static void vdso_init_cr5(void) { unsigned long cr5; + if (user_mode == HOME_SPACE_MODE || !vdso_enabled) + return; cr5 = offsetof(struct _lowcore, paste); __ctl_load(cr5, 5, 5); } - -static void vdso_init_cr5(void) -{ - if (user_mode != HOME_SPACE_MODE && vdso_enabled) - on_each_cpu(__vdso_init_cr5, NULL, 1); -} #endif /* CONFIG_64BIT */ /* @@ -322,10 +310,8 @@ static int __init vdso_init(void) } vdso64_pagelist[vdso64_pages - 1] = virt_to_page(vdso_data); vdso64_pagelist[vdso64_pages] = NULL; -#ifndef CONFIG_SMP - if (vdso_alloc_per_cpu(0, &S390_lowcore)) + if (vdso_alloc_per_cpu(&S390_lowcore)) BUG(); -#endif vdso_init_cr5(); #endif /* CONFIG_64BIT */ @@ -335,7 +321,7 @@ static int __init vdso_init(void) return 0; } -arch_initcall(vdso_init); +early_initcall(vdso_init); int in_gate_area_no_mm(unsigned long addr) { diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c index bb48977..7bacee9 100644 --- a/arch/s390/kernel/vtime.c +++ b/arch/s390/kernel/vtime.c @@ -570,6 +570,9 @@ void init_cpu_vtimer(void) /* enable cpu timer interrupts */ __ctl_set_bit(0,10); + + /* set initial cpu timer */ + set_vtimer(0x7fffffffffffffffULL); } static int __cpuinit s390_nohz_notify(struct notifier_block *self, diff --git a/arch/s390/lib/spinlock.c b/arch/s390/lib/spinlock.c index 91754ff..093eb69 100644 --- a/arch/s390/lib/spinlock.c +++ b/arch/s390/lib/spinlock.c @@ -10,6 +10,7 @@ #include #include #include +#include #include int spin_retry = 1000; @@ -24,21 +25,6 @@ static int __init spin_retry_setup(char *str) } __setup("spin_retry=", spin_retry_setup); -static inline void _raw_yield(void) -{ - if (MACHINE_HAS_DIAG44) - asm volatile("diag 0,0,0x44"); -} - -static inline void _raw_yield_cpu(int cpu) -{ - if (MACHINE_HAS_DIAG9C) - asm volatile("diag %0,0,0x9c" - : : "d" (cpu_logical_map(cpu))); - else - _raw_yield(); -} - void arch_spin_lock_wait(arch_spinlock_t *lp) { int count = spin_retry; @@ -60,7 +46,7 @@ void arch_spin_lock_wait(arch_spinlock_t *lp) } owner = lp->owner_cpu; if (owner) - _raw_yield_cpu(~owner); + smp_yield_cpu(~owner); if (_raw_compare_and_swap(&lp->owner_cpu, 0, cpu) == 0) return; } @@ -91,7 +77,7 @@ void arch_spin_lock_wait_flags(arch_spinlock_t *lp, unsigned long flags) } owner = lp->owner_cpu; if (owner) - _raw_yield_cpu(~owner); + smp_yield_cpu(~owner); local_irq_disable(); if (_raw_compare_and_swap(&lp->owner_cpu, 0, cpu) == 0) return; @@ -121,7 +107,7 @@ void arch_spin_relax(arch_spinlock_t *lock) if (cpu != 0) { if (MACHINE_IS_VM || MACHINE_IS_KVM || !smp_vcpu_scheduled(~cpu)) - _raw_yield_cpu(~cpu); + smp_yield_cpu(~cpu); } } EXPORT_SYMBOL(arch_spin_relax); @@ -133,7 +119,7 @@ void _raw_read_lock_wait(arch_rwlock_t *rw) while (1) { if (count-- <= 0) { - _raw_yield(); + smp_yield(); count = spin_retry; } if (!arch_read_can_lock(rw)) @@ -153,7 +139,7 @@ void _raw_read_lock_wait_flags(arch_rwlock_t *rw, unsigned long flags) local_irq_restore(flags); while (1) { if (count-- <= 0) { - _raw_yield(); + smp_yield(); count = spin_retry; } if (!arch_read_can_lock(rw)) @@ -188,7 +174,7 @@ void _raw_write_lock_wait(arch_rwlock_t *rw) while (1) { if (count-- <= 0) { - _raw_yield(); + smp_yield(); count = spin_retry; } if (!arch_write_can_lock(rw)) @@ -206,7 +192,7 @@ void _raw_write_lock_wait_flags(arch_rwlock_t *rw, unsigned long flags) local_irq_restore(flags); while (1) { if (count-- <= 0) { - _raw_yield(); + smp_yield(); count = spin_retry; } if (!arch_write_can_lock(rw)) diff --git a/drivers/s390/char/sclp_quiesce.c b/drivers/s390/char/sclp_quiesce.c index 87fc0ac..69df137 100644 --- a/drivers/s390/char/sclp_quiesce.c +++ b/drivers/s390/char/sclp_quiesce.c @@ -15,7 +15,6 @@ #include #include #include -#include #include #include "sclp.h" diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c index 1b6d924..3303d66 100644 --- a/drivers/s390/char/zcore.c +++ b/drivers/s390/char/zcore.c @@ -21,7 +21,6 @@ #include #include #include -#include #include #include #include -- cgit v0.10.2 From 4c1051e37a0e2a941115c6fb7ba08c318f25a0f9 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Sun, 11 Mar 2012 11:59:27 -0400 Subject: [S390] rework idle code Whenever the cpu loads an enabled wait PSW it will appear as idle to the underlying host system. The code in default_idle calls vtime_stop_cpu which does the necessary voodoo to get the cpu time accounting right. The udelay code just loads an enabled wait PSW. To correct this rework the vtime_stop_cpu/vtime_start_cpu logic and move the difficult parts to entry[64].S, vtime_stop_cpu can now be called from anywhere and vtime_start_cpu is gone. The correction of the cpu time during wakeup from an enabled wait PSW is done with a critical section in entry[64].S. As vtime_start_cpu is gone, s390_idle_check can be removed as well. Signed-off-by: Martin Schwidefsky diff --git a/arch/s390/include/asm/cputime.h b/arch/s390/include/asm/cputime.h index c23c390..24ef186 100644 --- a/arch/s390/include/asm/cputime.h +++ b/arch/s390/include/asm/cputime.h @@ -170,24 +170,17 @@ struct s390_idle_data { unsigned int sequence; unsigned long long idle_count; unsigned long long idle_enter; + unsigned long long idle_exit; unsigned long long idle_time; int nohz_delay; }; DECLARE_PER_CPU(struct s390_idle_data, s390_idle); -void vtime_start_cpu(__u64 int_clock, __u64 enter_timer); cputime64_t s390_get_idle_time(int cpu); #define arch_idle_time(cpu) s390_get_idle_time(cpu) -static inline void s390_idle_check(struct pt_regs *regs, __u64 int_clock, - __u64 enter_timer) -{ - if (regs->psw.mask & PSW_MASK_WAIT) - vtime_start_cpu(int_clock, enter_timer); -} - static inline int s390_nohz_delay(int cpu) { return __get_cpu_var(s390_idle).nohz_delay != 0; diff --git a/arch/s390/include/asm/timer.h b/arch/s390/include/asm/timer.h index 814243c..e63069b 100644 --- a/arch/s390/include/asm/timer.h +++ b/arch/s390/include/asm/timer.h @@ -33,8 +33,8 @@ struct vtimer_queue { spinlock_t lock; __u64 timer; /* last programmed timer */ __u64 elapsed; /* elapsed time of timer expire values */ - __u64 idle; /* temp var for idle */ - int do_spt; /* =1: reprogram cpu timer in idle */ + __u64 idle_enter; /* cpu timer on idle enter */ + __u64 idle_exit; /* cpu timer on idle exit */ }; extern void init_virt_timer(struct vtimer_list *timer); diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c index aeeaf89..ed8c913 100644 --- a/arch/s390/kernel/asm-offsets.c +++ b/arch/s390/kernel/asm-offsets.c @@ -8,6 +8,8 @@ #include #include +#include +#include #include #include #include @@ -70,6 +72,12 @@ int main(void) DEFINE(__CLOCK_MONOTONIC, CLOCK_MONOTONIC); DEFINE(__CLOCK_REALTIME_RES, MONOTONIC_RES_NSEC); BLANK(); + /* idle data offsets */ + DEFINE(__IDLE_ENTER, offsetof(struct s390_idle_data, idle_enter)); + DEFINE(__IDLE_EXIT, offsetof(struct s390_idle_data, idle_exit)); + /* vtimer queue offsets */ + DEFINE(__VQ_IDLE_ENTER, offsetof(struct vtimer_queue, idle_enter)); + DEFINE(__VQ_IDLE_EXIT, offsetof(struct vtimer_queue, idle_exit)); /* lowcore offsets */ DEFINE(__LC_EXT_PARAMS, offsetof(struct _lowcore, ext_params)); DEFINE(__LC_EXT_CPU_ADDR, offsetof(struct _lowcore, ext_cpu_addr)); diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 6143521..74ee563 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -105,14 +105,14 @@ STACK_SIZE = 1 << STACK_SHIFT .macro ADD64 high,low,timer al \high,\timer - al \low,\timer+4 + al \low,4+\timer brc 12,.+8 ahi \high,1 .endm .macro SUB64 high,low,timer sl \high,\timer - sl \low,\timer+4 + sl \low,4+\timer brc 3,.+8 ahi \high,-1 .endm @@ -471,7 +471,6 @@ io_tif: jnz io_work # there is work to do (signals etc.) io_restore: mvc __LC_RETURN_PSW(8),__PT_PSW(%r11) - ni __LC_RETURN_PSW+1,0xfd # clean wait state bit stpt __LC_EXIT_TIMER lm %r0,%r15,__PT_R0(%r11) lpsw __LC_RETURN_PSW @@ -612,6 +611,26 @@ ext_skip: basr %r14,%r1 # call do_extint j io_return +/* + * Load idle PSW. The second "half" of this function is in cleanup_idle. + */ +ENTRY(psw_idle) + st %r4,__SF_EMPTY(%r15) + basr %r1,0 + la %r1,psw_idle_lpsw+4-.(%r1) + st %r1,__SF_EMPTY+4(%r15) + oi __SF_EMPTY+4(%r15),0x80 + la %r1,.Lvtimer_max-psw_idle_lpsw-4(%r1) + stck __IDLE_ENTER(%r2) + ltr %r5,%r5 + stpt __VQ_IDLE_ENTER(%r3) + jz psw_idle_lpsw + spt 0(%r1) +psw_idle_lpsw: + lpsw __SF_EMPTY(%r15) + br %r14 +psw_idle_end: + __critical_end: /* @@ -673,7 +692,6 @@ mcck_skip: TRACE_IRQS_ON mcck_return: mvc __LC_RETURN_MCCK_PSW(8),__PT_PSW(%r11) # move return PSW - ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? jno 0f lm %r0,%r15,__PT_R0(%r11) @@ -748,6 +766,8 @@ cleanup_table: .long io_tif + 0x80000000 .long io_restore + 0x80000000 .long io_done + 0x80000000 + .long psw_idle + 0x80000000 + .long psw_idle_end + 0x80000000 cleanup_critical: cl %r9,BASED(cleanup_table) # system_call @@ -766,6 +786,10 @@ cleanup_critical: jl cleanup_io_tif cl %r9,BASED(cleanup_table+28) # io_done jl cleanup_io_restore + cl %r9,BASED(cleanup_table+32) # psw_idle + jl 0f + cl %r9,BASED(cleanup_table+36) # psw_idle_end + jl cleanup_idle 0: br %r14 cleanup_system_call: @@ -849,7 +873,6 @@ cleanup_io_restore: jhe 0f l %r9,12(%r11) # get saved r11 pointer to pt_regs mvc __LC_RETURN_PSW(8),__PT_PSW(%r9) - ni __LC_RETURN_PSW+1,0xfd # clear wait state bit mvc 0(32,%r11),__PT_R8(%r9) lm %r0,%r7,__PT_R0(%r9) 0: lm %r8,%r9,__LC_RETURN_PSW @@ -857,11 +880,52 @@ cleanup_io_restore: cleanup_io_restore_insn: .long io_done - 4 + 0x80000000 +cleanup_idle: + # copy interrupt clock & cpu timer + mvc __IDLE_EXIT(8,%r2),__LC_INT_CLOCK + mvc __VQ_IDLE_EXIT(8,%r3),__LC_ASYNC_ENTER_TIMER + chi %r11,__LC_SAVE_AREA_ASYNC + je 0f + mvc __IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK + mvc __VQ_IDLE_EXIT(8,%r3),__LC_MCCK_ENTER_TIMER +0: # check if stck has been executed + cl %r9,BASED(cleanup_idle_insn) + jhe 1f + mvc __IDLE_ENTER(8,%r2),__IDLE_EXIT(%r2) + mvc __VQ_IDLE_ENTER(8,%r3),__VQ_IDLE_EXIT(%r3) + j 2f +1: # check if the cpu timer has been reprogrammed + ltr %r5,%r5 + jz 2f + spt __VQ_IDLE_ENTER(%r3) +2: # account system time going idle + lm %r9,%r10,__LC_STEAL_TIMER + ADD64 %r9,%r10,__IDLE_ENTER(%r2) + SUB64 %r9,%r10,__LC_LAST_UPDATE_CLOCK + stm %r9,%r10,__LC_STEAL_TIMER + mvc __LC_LAST_UPDATE_CLOCK(8),__IDLE_EXIT(%r2) + lm %r9,%r10,__LC_SYSTEM_TIMER + ADD64 %r9,%r10,__LC_LAST_UPDATE_TIMER + SUB64 %r9,%r10,__VQ_IDLE_ENTER(%r3) + stm %r9,%r10,__LC_SYSTEM_TIMER + mvc __LC_LAST_UPDATE_TIMER(8),__VQ_IDLE_EXIT(%r3) + # prepare return psw + n %r8,BASED(cleanup_idle_wait) # clear wait state bit + l %r9,24(%r11) # return from psw_idle + br %r14 +cleanup_idle_insn: + .long psw_idle_lpsw + 0x80000000 +cleanup_idle_wait: + .long 0xfffdffff + /* * Integer constants */ .align 4 -.Lnr_syscalls: .long NR_syscalls +.Lnr_syscalls: + .long NR_syscalls +.Lvtimer_max: + .quad 0x7fffffffffffffff /* * Symbol constants diff --git a/arch/s390/kernel/entry.h b/arch/s390/kernel/entry.h index 92b1617..4984785 100644 --- a/arch/s390/kernel/entry.h +++ b/arch/s390/kernel/entry.h @@ -4,7 +4,8 @@ #include #include #include - +#include +#include extern void (*pgm_check_table[128])(struct pt_regs *); extern void *restart_stack; @@ -16,6 +17,8 @@ void io_int_handler(void); void mcck_int_handler(void); void restart_int_handler(void); void restart_call_handler(void); +void psw_idle(struct s390_idle_data *, struct vtimer_queue *, + unsigned long, int); asmlinkage long do_syscall_trace_enter(struct pt_regs *regs); asmlinkage void do_syscall_trace_exit(struct pt_regs *regs); diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index e33789a..4e1c292 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -489,7 +489,6 @@ io_restore: lg %r14,__LC_VDSO_PER_CPU lmg %r0,%r10,__PT_R0(%r11) mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) - ni __LC_RETURN_PSW+1,0xfd # clear wait state bit stpt __LC_EXIT_TIMER mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER lmg %r11,%r15,__PT_R11(%r11) @@ -631,6 +630,24 @@ ext_skip: brasl %r14,do_extint j io_return +/* + * Load idle PSW. The second "half" of this function is in cleanup_idle. + */ +ENTRY(psw_idle) + stg %r4,__SF_EMPTY(%r15) + larl %r1,psw_idle_lpsw+4 + stg %r1,__SF_EMPTY+8(%r15) + larl %r1,.Lvtimer_max + stck __IDLE_ENTER(%r2) + ltr %r5,%r5 + stpt __VQ_IDLE_ENTER(%r3) + jz psw_idle_lpsw + spt 0(%r1) +psw_idle_lpsw: + lpswe __SF_EMPTY(%r15) + br %r14 +psw_idle_end: + __critical_end: /* @@ -696,7 +713,6 @@ mcck_return: lg %r14,__LC_VDSO_PER_CPU lmg %r0,%r10,__PT_R0(%r11) mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW - ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? jno 0f stpt __LC_EXIT_TIMER @@ -770,6 +786,8 @@ cleanup_table: .quad io_tif .quad io_restore .quad io_done + .quad psw_idle + .quad psw_idle_end cleanup_critical: clg %r9,BASED(cleanup_table) # system_call @@ -788,6 +806,10 @@ cleanup_critical: jl cleanup_io_tif clg %r9,BASED(cleanup_table+56) # io_done jl cleanup_io_restore + clg %r9,BASED(cleanup_table+64) # psw_idle + jl 0f + clg %r9,BASED(cleanup_table+72) # psw_idle_end + jl cleanup_idle 0: br %r14 @@ -877,7 +899,6 @@ cleanup_io_restore: je 0f lg %r9,24(%r11) # get saved r11 pointer to pt_regs mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) - ni __LC_RETURN_PSW+1,0xfd # clear wait state bit mvc 0(64,%r11),__PT_R8(%r9) lmg %r0,%r7,__PT_R0(%r9) 0: lmg %r8,%r9,__LC_RETURN_PSW @@ -885,6 +906,42 @@ cleanup_io_restore: cleanup_io_restore_insn: .quad io_done - 4 +cleanup_idle: + # copy interrupt clock & cpu timer + mvc __IDLE_EXIT(8,%r2),__LC_INT_CLOCK + mvc __VQ_IDLE_EXIT(8,%r3),__LC_ASYNC_ENTER_TIMER + cghi %r11,__LC_SAVE_AREA_ASYNC + je 0f + mvc __IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK + mvc __VQ_IDLE_EXIT(8,%r3),__LC_MCCK_ENTER_TIMER +0: # check if stck & stpt have been executed + clg %r9,BASED(cleanup_idle_insn) + jhe 1f + mvc __IDLE_ENTER(8,%r2),__IDLE_EXIT(%r2) + mvc __VQ_IDLE_ENTER(8,%r3),__VQ_IDLE_EXIT(%r3) + j 2f +1: # check if the cpu timer has been reprogrammed + ltr %r5,%r5 + jz 2f + spt __VQ_IDLE_ENTER(%r3) +2: # account system time going idle + lg %r9,__LC_STEAL_TIMER + alg %r9,__IDLE_ENTER(%r2) + slg %r9,__LC_LAST_UPDATE_CLOCK + stg %r9,__LC_STEAL_TIMER + mvc __LC_LAST_UPDATE_CLOCK(8),__IDLE_EXIT(%r2) + lg %r9,__LC_SYSTEM_TIMER + alg %r9,__LC_LAST_UPDATE_TIMER + slg %r9,__VQ_IDLE_ENTER(%r3) + stg %r9,__LC_SYSTEM_TIMER + mvc __LC_LAST_UPDATE_TIMER(8),__VQ_IDLE_EXIT(%r3) + # prepare return psw + nihh %r8,0xfffd # clear wait state bit + lg %r9,48(%r11) # return from psw_idle + br %r14 +cleanup_idle_insn: + .quad psw_idle_lpsw + /* * Integer constants */ @@ -893,6 +950,8 @@ cleanup_io_restore_insn: .quad __critical_start .Lcritical_length: .quad __critical_end - __critical_start +.Lvtimer_max: + .quad 0x7fffffffffffffff #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c index b9a7fdd..09a014c 100644 --- a/arch/s390/kernel/irq.c +++ b/arch/s390/kernel/irq.c @@ -219,8 +219,6 @@ void __irq_entry do_extint(struct pt_regs *regs, unsigned int ext_int_code, code = (unsigned short) ext_int_code; old_regs = set_irq_regs(regs); - s390_idle_check(regs, S390_lowcore.int_clock, - S390_lowcore.async_enter_timer); irq_enter(); if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) /* Serve timer interrupts first. */ diff --git a/arch/s390/kernel/nmi.c b/arch/s390/kernel/nmi.c index 0fd2e86..8c372ca 100644 --- a/arch/s390/kernel/nmi.c +++ b/arch/s390/kernel/nmi.c @@ -254,8 +254,6 @@ void notrace s390_do_machine_check(struct pt_regs *regs) int umode; nmi_enter(); - s390_idle_check(regs, S390_lowcore.mcck_clock, - S390_lowcore.mcck_enter_timer); kstat_cpu(smp_processor_id()).irqs[NMI_NMI]++; mci = (struct mci *) &S390_lowcore.mcck_interruption_code; mcck = &__get_cpu_var(cpu_mcck); diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c index e795933..78b3c14 100644 --- a/arch/s390/kernel/process.c +++ b/arch/s390/kernel/process.c @@ -77,13 +77,8 @@ static void default_idle(void) local_irq_enable(); return; } - trace_hardirqs_on(); - /* Don't trace preempt off for idle. */ - stop_critical_timings(); - /* Stop virtual timer and halt the cpu. */ + /* Halt the cpu and keep track of cpu time accounting. */ vtime_stop_cpu(); - /* Reenable preemption tracer. */ - start_critical_timings(); } void cpu_idle(void) diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 6db8526..afd6e51 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -972,22 +972,16 @@ static DEVICE_ATTR(capability, 0444, show_capability, NULL); static ssize_t show_idle_count(struct device *dev, struct device_attribute *attr, char *buf) { - struct s390_idle_data *idle; + struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id); unsigned long long idle_count; unsigned int sequence; - idle = &per_cpu(s390_idle, dev->id); -repeat: - sequence = idle->sequence; - smp_rmb(); - if (sequence & 1) - goto repeat; - idle_count = idle->idle_count; - if (idle->idle_enter) - idle_count++; - smp_rmb(); - if (idle->sequence != sequence) - goto repeat; + do { + sequence = ACCESS_ONCE(idle->sequence); + idle_count = ACCESS_ONCE(idle->idle_count); + if (ACCESS_ONCE(idle->idle_enter)) + idle_count++; + } while ((sequence & 1) || (idle->sequence != sequence)); return sprintf(buf, "%llu\n", idle_count); } static DEVICE_ATTR(idle_count, 0444, show_idle_count, NULL); @@ -995,24 +989,18 @@ static DEVICE_ATTR(idle_count, 0444, show_idle_count, NULL); static ssize_t show_idle_time(struct device *dev, struct device_attribute *attr, char *buf) { - struct s390_idle_data *idle; - unsigned long long now, idle_time, idle_enter; + struct s390_idle_data *idle = &per_cpu(s390_idle, dev->id); + unsigned long long now, idle_time, idle_enter, idle_exit; unsigned int sequence; - idle = &per_cpu(s390_idle, dev->id); - now = get_clock(); -repeat: - sequence = idle->sequence; - smp_rmb(); - if (sequence & 1) - goto repeat; - idle_time = idle->idle_time; - idle_enter = idle->idle_enter; - if (idle_enter != 0ULL && idle_enter < now) - idle_time += now - idle_enter; - smp_rmb(); - if (idle->sequence != sequence) - goto repeat; + do { + now = get_clock(); + sequence = ACCESS_ONCE(idle->sequence); + idle_time = ACCESS_ONCE(idle->idle_time); + idle_enter = ACCESS_ONCE(idle->idle_enter); + idle_exit = ACCESS_ONCE(idle->idle_exit); + } while ((sequence & 1) || (idle->sequence != sequence)); + idle_time += idle_enter ? ((idle_exit ? : now) - idle_enter) : 0; return sprintf(buf, "%llu\n", idle_time >> 12); } static DEVICE_ATTR(idle_time_us, 0444, show_idle_time, NULL); diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c index 7bacee9..277ea71 100644 --- a/arch/s390/kernel/vtime.c +++ b/arch/s390/kernel/vtime.c @@ -26,6 +26,7 @@ #include #include #include +#include "entry.h" static DEFINE_PER_CPU(struct vtimer_queue, virt_cpu_timer); @@ -123,153 +124,53 @@ void account_system_vtime(struct task_struct *tsk) } EXPORT_SYMBOL_GPL(account_system_vtime); -void __kprobes vtime_start_cpu(__u64 int_clock, __u64 enter_timer) +void __kprobes vtime_stop_cpu(void) { struct s390_idle_data *idle = &__get_cpu_var(s390_idle); struct vtimer_queue *vq = &__get_cpu_var(virt_cpu_timer); - __u64 idle_time, expires; + unsigned long long idle_time; + unsigned long psw_mask; - if (idle->idle_enter == 0ULL) - return; + trace_hardirqs_on(); + /* Don't trace preempt off for idle. */ + stop_critical_timings(); - /* Account time spent with enabled wait psw loaded as idle time. */ - idle_time = int_clock - idle->idle_enter; - account_idle_time(idle_time); - S390_lowcore.steal_timer += - idle->idle_enter - S390_lowcore.last_update_clock; - S390_lowcore.last_update_clock = int_clock; - - /* Account system time spent going idle. */ - S390_lowcore.system_timer += S390_lowcore.last_update_timer - vq->idle; - S390_lowcore.last_update_timer = enter_timer; - - /* Restart vtime CPU timer */ - if (vq->do_spt) { - /* Program old expire value but first save progress. */ - expires = vq->idle - enter_timer; - expires += get_vtimer(); - set_vtimer(expires); - } else { - /* Don't account the CPU timer delta while the cpu was idle. */ - vq->elapsed -= vq->idle - enter_timer; - } + /* Wait for external, I/O or machine check interrupt. */ + psw_mask = psw_kernel_bits | PSW_MASK_WAIT | PSW_MASK_DAT | + PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; + idle->nohz_delay = 0; + /* Call the assembler magic in entry.S */ + psw_idle(idle, vq, psw_mask, !list_empty(&vq->list)); + + /* Reenable preemption tracer. */ + start_critical_timings(); + + /* Account time spent with enabled wait psw loaded as idle time. */ idle->sequence++; smp_wmb(); + idle_time = idle->idle_exit - idle->idle_enter; idle->idle_time += idle_time; - idle->idle_enter = 0ULL; + idle->idle_enter = idle->idle_exit = 0ULL; idle->idle_count++; + account_idle_time(idle_time); smp_wmb(); idle->sequence++; } -void __kprobes vtime_stop_cpu(void) -{ - struct s390_idle_data *idle = &__get_cpu_var(s390_idle); - struct vtimer_queue *vq = &__get_cpu_var(virt_cpu_timer); - psw_t psw; - - /* Wait for external, I/O or machine check interrupt. */ - psw.mask = psw_kernel_bits | PSW_MASK_WAIT | - PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK; - - idle->nohz_delay = 0; - - /* Check if the CPU timer needs to be reprogrammed. */ - if (vq->do_spt) { - __u64 vmax = VTIMER_MAX_SLICE; - /* - * The inline assembly is equivalent to - * vq->idle = get_cpu_timer(); - * set_cpu_timer(VTIMER_MAX_SLICE); - * idle->idle_enter = get_clock(); - * __load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT | - * PSW_MASK_DAT | PSW_MASK_IO | - * PSW_MASK_EXT | PSW_MASK_MCHECK); - * The difference is that the inline assembly makes sure that - * the last three instruction are stpt, stck and lpsw in that - * order. This is done to increase the precision. - */ - asm volatile( -#ifndef CONFIG_64BIT - " basr 1,0\n" - "0: ahi 1,1f-0b\n" - " st 1,4(%2)\n" -#else /* CONFIG_64BIT */ - " larl 1,1f\n" - " stg 1,8(%2)\n" -#endif /* CONFIG_64BIT */ - " stpt 0(%4)\n" - " spt 0(%5)\n" - " stck 0(%3)\n" -#ifndef CONFIG_64BIT - " lpsw 0(%2)\n" -#else /* CONFIG_64BIT */ - " lpswe 0(%2)\n" -#endif /* CONFIG_64BIT */ - "1:" - : "=m" (idle->idle_enter), "=m" (vq->idle) - : "a" (&psw), "a" (&idle->idle_enter), - "a" (&vq->idle), "a" (&vmax), "m" (vmax), "m" (psw) - : "memory", "cc", "1"); - } else { - /* - * The inline assembly is equivalent to - * vq->idle = get_cpu_timer(); - * idle->idle_enter = get_clock(); - * __load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT | - * PSW_MASK_DAT | PSW_MASK_IO | - * PSW_MASK_EXT | PSW_MASK_MCHECK); - * The difference is that the inline assembly makes sure that - * the last three instruction are stpt, stck and lpsw in that - * order. This is done to increase the precision. - */ - asm volatile( -#ifndef CONFIG_64BIT - " basr 1,0\n" - "0: ahi 1,1f-0b\n" - " st 1,4(%2)\n" -#else /* CONFIG_64BIT */ - " larl 1,1f\n" - " stg 1,8(%2)\n" -#endif /* CONFIG_64BIT */ - " stpt 0(%4)\n" - " stck 0(%3)\n" -#ifndef CONFIG_64BIT - " lpsw 0(%2)\n" -#else /* CONFIG_64BIT */ - " lpswe 0(%2)\n" -#endif /* CONFIG_64BIT */ - "1:" - : "=m" (idle->idle_enter), "=m" (vq->idle) - : "a" (&psw), "a" (&idle->idle_enter), - "a" (&vq->idle), "m" (psw) - : "memory", "cc", "1"); - } -} - cputime64_t s390_get_idle_time(int cpu) { - struct s390_idle_data *idle; - unsigned long long now, idle_time, idle_enter; + struct s390_idle_data *idle = &per_cpu(s390_idle, cpu); + unsigned long long now, idle_enter, idle_exit; unsigned int sequence; - idle = &per_cpu(s390_idle, cpu); - - now = get_clock(); -repeat: - sequence = idle->sequence; - smp_rmb(); - if (sequence & 1) - goto repeat; - idle_time = 0; - idle_enter = idle->idle_enter; - if (idle_enter != 0ULL && idle_enter < now) - idle_time = now - idle_enter; - smp_rmb(); - if (idle->sequence != sequence) - goto repeat; - return idle_time; + do { + now = get_clock(); + sequence = ACCESS_ONCE(idle->sequence); + idle_enter = ACCESS_ONCE(idle->idle_enter); + idle_exit = ACCESS_ONCE(idle->idle_exit); + } while ((sequence & 1) || (idle->sequence != sequence)); + return idle_enter ? ((idle_exit ? : now) - idle_enter) : 0; } /* @@ -346,7 +247,6 @@ static void do_cpu_timer_interrupt(unsigned int ext_int_code, } spin_unlock(&vq->lock); - vq->do_spt = list_empty(&cb_list); do_callbacks(&cb_list); /* next event is first in list */ @@ -355,8 +255,7 @@ static void do_cpu_timer_interrupt(unsigned int ext_int_code, if (!list_empty(&vq->list)) { event = list_first_entry(&vq->list, struct vtimer_list, entry); next = event->expires; - } else - vq->do_spt = 0; + } spin_unlock(&vq->lock); /* * To improve precision add the time spent by the diff --git a/arch/s390/lib/delay.c b/arch/s390/lib/delay.c index db92f04..9f1f71e 100644 --- a/arch/s390/lib/delay.c +++ b/arch/s390/lib/delay.c @@ -13,6 +13,7 @@ #include #include #include +#include void __delay(unsigned long loops) { @@ -28,36 +29,33 @@ void __delay(unsigned long loops) static void __udelay_disabled(unsigned long long usecs) { - unsigned long mask, cr0, cr0_saved; - u64 clock_saved; - u64 end; + unsigned long cr0, cr6, new; + u64 clock_saved, end; - mask = psw_kernel_bits | PSW_MASK_DAT | PSW_MASK_WAIT | - PSW_MASK_EXT | PSW_MASK_MCHECK; end = get_clock() + (usecs << 12); clock_saved = local_tick_disable(); - __ctl_store(cr0_saved, 0, 0); - cr0 = (cr0_saved & 0xffff00e0) | 0x00000800; - __ctl_load(cr0 , 0, 0); + __ctl_store(cr0, 0, 0); + __ctl_store(cr6, 6, 6); + new = (cr0 & 0xffff00e0) | 0x00000800; + __ctl_load(new , 0, 0); + new = 0; + __ctl_load(new, 6, 6); lockdep_off(); do { set_clock_comparator(end); - trace_hardirqs_on(); - __load_psw_mask(mask); + vtime_stop_cpu(); local_irq_disable(); } while (get_clock() < end); lockdep_on(); - __ctl_load(cr0_saved, 0, 0); + __ctl_load(cr0, 0, 0); + __ctl_load(cr6, 6, 6); local_tick_enable(clock_saved); } static void __udelay_enabled(unsigned long long usecs) { - unsigned long mask; - u64 clock_saved; - u64 end; + u64 clock_saved, end; - mask = psw_kernel_bits | PSW_MASK_WAIT | PSW_MASK_EXT | PSW_MASK_IO; end = get_clock() + (usecs << 12); do { clock_saved = 0; @@ -65,8 +63,7 @@ static void __udelay_enabled(unsigned long long usecs) clock_saved = local_tick_disable(); set_clock_comparator(end); } - trace_hardirqs_on(); - __load_psw_mask(mask); + vtime_stop_cpu(); local_irq_disable(); if (clock_saved) local_tick_enable(clock_saved); diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c index dc67c39..a49c46c 100644 --- a/drivers/s390/cio/cio.c +++ b/drivers/s390/cio/cio.c @@ -601,8 +601,6 @@ void __irq_entry do_IRQ(struct pt_regs *regs) struct pt_regs *old_regs; old_regs = set_irq_regs(regs); - s390_idle_check(regs, S390_lowcore.int_clock, - S390_lowcore.async_enter_timer); irq_enter(); __this_cpu_write(s390_idle.nohz_delay, 1); if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) -- cgit v0.10.2 From b43445ff6c514822979cc9ae02c76f98bf68721c Mon Sep 17 00:00:00 2001 From: Michael Holzheu Date: Sun, 11 Mar 2012 11:59:28 -0400 Subject: [S390] Use copy_to_absolute_zero() instead of "stura/sturg" Use the new copy_to_absolute_zero() function instead of manual "stura" and "sturg" to make the code shorter and more readable. Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c index e5a72a2..9e2f6f7 100644 --- a/arch/s390/kernel/ipl.c +++ b/arch/s390/kernel/ipl.c @@ -1498,30 +1498,12 @@ static struct shutdown_action __refdata dump_action = { static void dump_reipl_run(struct shutdown_trigger *trigger) { - preempt_disable(); - /* - * Bypass dynamic address translation (DAT) when storing IPL parameter - * information block address and checksum into the prefix area - * (corresponding to absolute addresses 0-8191). - * When enhanced DAT applies and the STE format control in one, - * the absolute address is formed without prefixing. In this case a - * normal store (stg/st) into the prefix area would no more match to - * absolute addresses 0-8191. - */ -#ifdef CONFIG_64BIT - asm volatile("sturg %0,%1" - :: "a" ((unsigned long) reipl_block_actual), - "a" (&lowcore_ptr[smp_processor_id()]->ipib)); -#else - asm volatile("stura %0,%1" - :: "a" ((unsigned long) reipl_block_actual), - "a" (&lowcore_ptr[smp_processor_id()]->ipib)); -#endif - asm volatile("stura %0,%1" - :: "a" (csum_partial(reipl_block_actual, - reipl_block_actual->hdr.len, 0)), - "a" (&lowcore_ptr[smp_processor_id()]->ipib_checksum)); - preempt_enable(); + u32 csum; + + csum = csum_partial(reipl_block_actual, reipl_block_actual->hdr.len, 0); + copy_to_absolute_zero(&S390_lowcore.ipib_checksum, &csum, sizeof(csum)); + copy_to_absolute_zero(&S390_lowcore.ipib, &reipl_block_actual, + sizeof(reipl_block_actual)); dump_run(trigger); } -- cgit v0.10.2 From e3c652b533aab733bf3ffb50654fb82f079c5329 Mon Sep 17 00:00:00 2001 From: Michael Holzheu Date: Sun, 11 Mar 2012 11:59:29 -0400 Subject: [S390] zfcpdump: Implement async sdias event processing There are two different ways to do the "store data in absolute storage" SCLP event processing, synchronous and asynchrounous. This patch adds the asynchronous variant. Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky diff --git a/drivers/s390/char/sclp_sdias.c b/drivers/s390/char/sclp_sdias.c index fa733ec..69e6c50 100644 --- a/drivers/s390/char/sclp_sdias.c +++ b/drivers/s390/char/sclp_sdias.c @@ -8,6 +8,7 @@ #define KMSG_COMPONENT "sclp_sdias" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt +#include #include #include #include @@ -62,15 +63,29 @@ struct sdias_sccb { } __attribute__((packed)); static struct sdias_sccb sccb __attribute__((aligned(4096))); +static struct sdias_evbuf sdias_evbuf; -static int sclp_req_done; -static wait_queue_head_t sdias_wq; +static DECLARE_COMPLETION(evbuf_accepted); +static DECLARE_COMPLETION(evbuf_done); static DEFINE_MUTEX(sdias_mutex); +/* + * Called by SCLP base when read event data has been completed (async mode only) + */ +static void sclp_sdias_receiver_fn(struct evbuf_header *evbuf) +{ + memcpy(&sdias_evbuf, evbuf, + min_t(unsigned long, sizeof(sdias_evbuf), evbuf->length)); + complete(&evbuf_done); + TRACE("sclp_sdias_receiver_fn done\n"); +} + +/* + * Called by SCLP base when sdias event has been accepted + */ static void sdias_callback(struct sclp_req *request, void *data) { - sclp_req_done = 1; - wake_up(&sdias_wq); /* Inform caller, that request is complete */ + complete(&evbuf_accepted); TRACE("callback done\n"); } @@ -80,7 +95,6 @@ static int sdias_sclp_send(struct sclp_req *req) int rc; for (retries = SDIAS_RETRIES; retries; retries--) { - sclp_req_done = 0; TRACE("add request\n"); rc = sclp_add_request(req); if (rc) { @@ -91,16 +105,31 @@ static int sdias_sclp_send(struct sclp_req *req) continue; } /* initiated, wait for completion of service call */ - wait_event(sdias_wq, (sclp_req_done == 1)); + wait_for_completion(&evbuf_accepted); if (req->status == SCLP_REQ_FAILED) { TRACE("sclp request failed\n"); - rc = -EIO; continue; } + /* if not accepted, retry */ + if (!(sccb.evbuf.hdr.flags & 0x80)) { + TRACE("sclp request failed: flags=%x\n", + sccb.evbuf.hdr.flags); + continue; + } + /* + * for the sync interface the response is in the initial sccb + */ + if (!sclp_sdias_register.receiver_fn) { + memcpy(&sdias_evbuf, &sccb.evbuf, sizeof(sdias_evbuf)); + TRACE("sync request done\n"); + return 0; + } + /* otherwise we wait for completion */ + wait_for_completion(&evbuf_done); TRACE("request done\n"); - break; + return 0; } - return rc; + return -EIO; } /* @@ -140,13 +169,12 @@ int sclp_sdias_blk_count(void) goto out; } - switch (sccb.evbuf.event_status) { + switch (sdias_evbuf.event_status) { case 0: - rc = sccb.evbuf.blk_cnt; + rc = sdias_evbuf.blk_cnt; break; default: - pr_err("SCLP error: %x\n", - sccb.evbuf.event_status); + pr_err("SCLP error: %x\n", sdias_evbuf.event_status); rc = -EIO; goto out; } @@ -211,18 +239,18 @@ int sclp_sdias_copy(void *dest, int start_blk, int nr_blks) goto out; } - switch (sccb.evbuf.event_status) { + switch (sdias_evbuf.event_status) { case EVSTATE_ALL_STORED: TRACE("all stored\n"); case EVSTATE_PART_STORED: - TRACE("part stored: %i\n", sccb.evbuf.blk_cnt); + TRACE("part stored: %i\n", sdias_evbuf.blk_cnt); break; case EVSTATE_NO_DATA: TRACE("no data\n"); default: pr_err("Error from SCLP while copying hsa. " "Event status = %x\n", - sccb.evbuf.event_status); + sdias_evbuf.event_status); rc = -EIO; } out: @@ -230,19 +258,50 @@ out: return rc; } -int __init sclp_sdias_init(void) +static int __init sclp_sdias_register_check(void) { int rc; + rc = sclp_register(&sclp_sdias_register); + if (rc) + return rc; + if (sclp_sdias_blk_count() == 0) { + sclp_unregister(&sclp_sdias_register); + return -ENODEV; + } + return 0; +} + +static int __init sclp_sdias_init_sync(void) +{ + TRACE("Try synchronous mode\n"); + sclp_sdias_register.receive_mask = 0; + sclp_sdias_register.receiver_fn = NULL; + return sclp_sdias_register_check(); +} + +static int __init sclp_sdias_init_async(void) +{ + TRACE("Try asynchronous mode\n"); + sclp_sdias_register.receive_mask = EVTYP_SDIAS_MASK; + sclp_sdias_register.receiver_fn = sclp_sdias_receiver_fn; + return sclp_sdias_register_check(); +} + +int __init sclp_sdias_init(void) +{ if (ipl_info.type != IPL_TYPE_FCP_DUMP) return 0; sdias_dbf = debug_register("dump_sdias", 4, 1, 4 * sizeof(long)); debug_register_view(sdias_dbf, &debug_sprintf_view); debug_set_level(sdias_dbf, 6); - rc = sclp_register(&sclp_sdias_register); - if (rc) - return rc; - init_waitqueue_head(&sdias_wq); + if (sclp_sdias_init_sync() == 0) + goto out; + if (sclp_sdias_init_async() == 0) + goto out; + TRACE("init failed\n"); + return -ENODEV; +out: TRACE("init done\n"); return 0; } -- cgit v0.10.2 From 2215011dd9c1b01f1fc430620ed31f2baad267c3 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Sun, 11 Mar 2012 11:59:30 -0400 Subject: [S390] irq: set __ARCH_IRQ_EXIT_IRQS_DISABLED Set __ARCH_IRQ_EXIT_IRQS_DISABLED in order to optimize irq_exit() a bit, since we call __do_softirq() instead of do_softirq(). This saves several needless checks, pointless interrupt disabling and an extra branch. If do_softirq() gets called from process context we still switch to the async stack. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky diff --git a/arch/s390/include/asm/hardirq.h b/arch/s390/include/asm/hardirq.h index e4155d3..510ba9e 100644 --- a/arch/s390/include/asm/hardirq.h +++ b/arch/s390/include/asm/hardirq.h @@ -18,6 +18,7 @@ #define __ARCH_IRQ_STAT #define __ARCH_HAS_DO_SOFTIRQ +#define __ARCH_IRQ_EXIT_IRQS_DISABLED #define HARDIRQ_BITS 8 -- cgit v0.10.2 From fde15c3a3adc7b65cd0610dd6bca4804ee7ffd38 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Sun, 11 Mar 2012 11:59:31 -0400 Subject: [S390] irq: external interrupt code passing The external interrupt handlers have a parameter called ext_int_code. Besides the name this paramter does not only contain the ext_int_code but in addition also the "cpu address" (POP) which caused the external interrupt. To make the code a bit more obvious pass a struct instead so the called function can easily distinguish between external interrupt code and cpu address. The cpu address field however is named "subcode" since some external interrupt sources do not pass a cpu address but a different parameter (or none at all). Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky diff --git a/arch/s390/include/asm/irq.h b/arch/s390/include/asm/irq.h index ba6d85f..acee180 100644 --- a/arch/s390/include/asm/irq.h +++ b/arch/s390/include/asm/irq.h @@ -34,7 +34,12 @@ enum interruption_class { NR_IRQS, }; -typedef void (*ext_int_handler_t)(unsigned int, unsigned int, unsigned long); +struct ext_code { + unsigned short subcode; + unsigned short code; +}; + +typedef void (*ext_int_handler_t)(struct ext_code, unsigned int, unsigned long); int register_external_interrupt(u16 code, ext_int_handler_t handler); int unregister_external_interrupt(u16 code, ext_int_handler_t handler); diff --git a/arch/s390/kernel/entry.h b/arch/s390/kernel/entry.h index 4984785..6cdddac 100644 --- a/arch/s390/kernel/entry.h +++ b/arch/s390/kernel/entry.h @@ -35,7 +35,8 @@ int handle_signal32(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *oldset, struct pt_regs *regs); void do_notify_resume(struct pt_regs *regs); -void do_extint(struct pt_regs *regs, unsigned int, unsigned int, unsigned long); +struct ext_code; +void do_extint(struct pt_regs *regs, struct ext_code, unsigned int, unsigned long); void do_restart(void); void __init startup_init(void); void die(struct pt_regs *regs, const char *str); diff --git a/arch/s390/kernel/irq.c b/arch/s390/kernel/irq.c index 09a014c..7a97d57 100644 --- a/arch/s390/kernel/irq.c +++ b/arch/s390/kernel/irq.c @@ -209,29 +209,27 @@ int unregister_external_interrupt(u16 code, ext_int_handler_t handler) } EXPORT_SYMBOL(unregister_external_interrupt); -void __irq_entry do_extint(struct pt_regs *regs, unsigned int ext_int_code, +void __irq_entry do_extint(struct pt_regs *regs, struct ext_code ext_code, unsigned int param32, unsigned long param64) { struct pt_regs *old_regs; - unsigned short code; struct ext_int_info *p; int index; - code = (unsigned short) ext_int_code; old_regs = set_irq_regs(regs); irq_enter(); if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) /* Serve timer interrupts first. */ clock_comparator_work(); kstat_cpu(smp_processor_id()).irqs[EXTERNAL_INTERRUPT]++; - if (code != 0x1004) + if (ext_code.code != 0x1004) __get_cpu_var(s390_idle).nohz_delay = 1; - index = ext_hash(code); + index = ext_hash(ext_code.code); rcu_read_lock(); list_for_each_entry_rcu(p, &ext_int_hash[index], entry) - if (likely(p->code == code)) - p->handler(ext_int_code, param32, param64); + if (likely(p->code == ext_code.code)) + p->handler(ext_code, param32, param64); rcu_read_unlock(); irq_exit(); set_irq_regs(old_regs); diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index afd6e51..734e644 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -434,14 +434,14 @@ void smp_stop_cpu(void) * This is the main routine where commands issued by other * cpus are handled. */ -static void do_ext_call_interrupt(unsigned int ext_int_code, +static void do_ext_call_interrupt(struct ext_code ext_code, unsigned int param32, unsigned long param64) { unsigned long bits; int cpu; cpu = smp_processor_id(); - if ((ext_int_code & 0xffff) == 0x1202) + if (ext_code.code == 0x1202) kstat_cpu(cpu).irqs[EXTINT_EXC]++; else kstat_cpu(cpu).irqs[EXTINT_EMS]++; diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c index 14da278..d4e1cb1 100644 --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -165,7 +165,7 @@ void init_cpu_timer(void) __ctl_set_bit(0, 4); } -static void clock_comparator_interrupt(unsigned int ext_int_code, +static void clock_comparator_interrupt(struct ext_code ext_code, unsigned int param32, unsigned long param64) { @@ -177,7 +177,7 @@ static void clock_comparator_interrupt(unsigned int ext_int_code, static void etr_timing_alert(struct etr_irq_parm *); static void stp_timing_alert(struct stp_irq_parm *); -static void timing_alert_interrupt(unsigned int ext_int_code, +static void timing_alert_interrupt(struct ext_code ext_code, unsigned int param32, unsigned long param64) { kstat_cpu(smp_processor_id()).irqs[EXTINT_TLA]++; diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c index 277ea71..39ebff5 100644 --- a/arch/s390/kernel/vtime.c +++ b/arch/s390/kernel/vtime.c @@ -220,7 +220,7 @@ static void do_callbacks(struct list_head *cb_list) /* * Handler for the virtual CPU timer. */ -static void do_cpu_timer_interrupt(unsigned int ext_int_code, +static void do_cpu_timer_interrupt(struct ext_code ext_code, unsigned int param32, unsigned long param64) { struct vtimer_queue *vq; diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index e8fcd92..b17c42d 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -532,7 +532,7 @@ void pfault_fini(void) static DEFINE_SPINLOCK(pfault_lock); static LIST_HEAD(pfault_list); -static void pfault_interrupt(unsigned int ext_int_code, +static void pfault_interrupt(struct ext_code ext_code, unsigned int param32, unsigned long param64) { struct task_struct *tsk; @@ -545,7 +545,7 @@ static void pfault_interrupt(unsigned int ext_int_code, * in the 'cpu address' field associated with the * external interrupt. */ - subcode = ext_int_code >> 16; + subcode = ext_code.subcode; if ((subcode & 0xff00) != __SUBCODE_MASK) return; kstat_cpu(smp_processor_id()).irqs[EXTINT_PFL]++; diff --git a/arch/s390/oprofile/hwsampler.c b/arch/s390/oprofile/hwsampler.c index 9daee91..12bea05 100644 --- a/arch/s390/oprofile/hwsampler.c +++ b/arch/s390/oprofile/hwsampler.c @@ -233,8 +233,8 @@ static inline unsigned long *trailer_entry_ptr(unsigned long v) } /* prototypes for external interrupt handler and worker */ -static void hws_ext_handler(unsigned int ext_int_code, - unsigned int param32, unsigned long param64); +static void hws_ext_handler(struct ext_code ext_code, + unsigned int param32, unsigned long param64); static void worker(struct work_struct *work); @@ -673,7 +673,7 @@ int hwsampler_activate(unsigned int cpu) return rc; } -static void hws_ext_handler(unsigned int ext_int_code, +static void hws_ext_handler(struct ext_code ext_code, unsigned int param32, unsigned long param64) { struct hws_cpu_buffer *cb; diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c index 46784b8..0cea7e9 100644 --- a/drivers/s390/block/dasd_diag.c +++ b/drivers/s390/block/dasd_diag.c @@ -229,7 +229,7 @@ dasd_diag_term_IO(struct dasd_ccw_req * cqr) } /* Handle external interruption. */ -static void dasd_ext_handler(unsigned int ext_int_code, +static void dasd_ext_handler(struct ext_code ext_code, unsigned int param32, unsigned long param64) { struct dasd_ccw_req *cqr, *next; @@ -239,7 +239,7 @@ static void dasd_ext_handler(unsigned int ext_int_code, addr_t ip; int rc; - switch (ext_int_code >> 24) { + switch (ext_code.subcode >> 8) { case DASD_DIAG_CODE_31BIT: ip = (addr_t) param32; break; @@ -280,7 +280,7 @@ static void dasd_ext_handler(unsigned int ext_int_code, cqr->stopclk = get_clock(); expires = 0; - if ((ext_int_code & 0xff0000) == 0) { + if ((ext_code.subcode & 0xff) == 0) { cqr->status = DASD_CQR_SUCCESS; /* Start first request on queue if possible -> fast_io. */ if (!list_empty(&device->ccw_queue)) { @@ -296,7 +296,7 @@ static void dasd_ext_handler(unsigned int ext_int_code, cqr->status = DASD_CQR_QUEUED; DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for " "request %p was %d (%d retries left)", cqr, - (ext_int_code >> 16) & 0xff, cqr->retries); + ext_code.subcode & 0xff, cqr->retries); dasd_diag_erp(device); } diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c index eaa7e78..30f29a0 100644 --- a/drivers/s390/char/sclp.c +++ b/drivers/s390/char/sclp.c @@ -393,7 +393,7 @@ __sclp_find_req(u32 sccb) /* Handler for external interruption. Perform request post-processing. * Prepare read event data request if necessary. Start processing of next * request on queue. */ -static void sclp_interrupt_handler(unsigned int ext_int_code, +static void sclp_interrupt_handler(struct ext_code ext_code, unsigned int param32, unsigned long param64) { struct sclp_req *req; @@ -818,7 +818,7 @@ EXPORT_SYMBOL(sclp_reactivate); /* Handler for external interruption used during initialization. Modify * request state to done. */ -static void sclp_check_handler(unsigned int ext_int_code, +static void sclp_check_handler(struct ext_code ext_code, unsigned int param32, unsigned long param64) { u32 finished_sccb; diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c index 7bc1955..d74e9ae 100644 --- a/drivers/s390/kvm/kvm_virtio.c +++ b/drivers/s390/kvm/kvm_virtio.c @@ -380,15 +380,13 @@ static void hotplug_devices(struct work_struct *dummy) /* * we emulate the request_irq behaviour on top of s390 extints */ -static void kvm_extint_handler(unsigned int ext_int_code, +static void kvm_extint_handler(struct ext_code ext_code, unsigned int param32, unsigned long param64) { struct virtqueue *vq; - u16 subcode; u32 param; - subcode = ext_int_code >> 16; - if ((subcode & 0xff00) != VIRTIO_SUBCODE_64) + if ((ext_code.subcode & 0xff00) != VIRTIO_SUBCODE_64) return; kstat_cpu(smp_processor_id()).irqs[EXTINT_VRT]++; diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c index 403be43..3ad1f9d 100644 --- a/net/iucv/iucv.c +++ b/net/iucv/iucv.c @@ -1800,7 +1800,7 @@ static void iucv_work_fn(struct work_struct *work) * Handles external interrupts coming in from CP. * Places the interrupt buffer on a queue and schedules iucv_tasklet_fn(). */ -static void iucv_external_interrupt(unsigned int ext_int_code, +static void iucv_external_interrupt(struct ext_code ext_code, unsigned int param32, unsigned long param64) { struct iucv_irq_data *p; -- cgit v0.10.2 From 3ab121ab18669226742891416fe7ecc86dadb047 Mon Sep 17 00:00:00 2001 From: Michael Holzheu Date: Sun, 11 Mar 2012 11:59:32 -0400 Subject: [S390] kernel: Add z/VM LGR detection Currently the following mechanisms are available to move active Linux on System z instances between machines: * z/VM 6.2 SSI (Single System Image) * Suspend/resume For moving Linux instances in this patch the term LGR (Linux Guest Relocation) is used. Because such an operation is critical, it should be detectable from Linux. With this patch for both, a live system and a kernel dump, the information about LGRs is accessible. To identify a guest, stsi and stfle data is used. A new function lgr_info_log() compares the current data (lgr_info_cur) with the last recorded one (lgr_info_last). In case the two data sets differ, lgr_info_cur is logged to the "lgr" s390dbf. The following trigger points call lgr_info_log(): * panic * die * kdump * LGR timer * PSW restart * QDIO recovery * resume This patch also changes the s390dbf hex_ascii view. Now only printable ASCII characters are shown. Reviewed-by: Heiko Carstens Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky diff --git a/arch/s390/include/asm/debug.h b/arch/s390/include/asm/debug.h index 9d88db1..8a8245e 100644 --- a/arch/s390/include/asm/debug.h +++ b/arch/s390/include/asm/debug.h @@ -131,6 +131,7 @@ void debug_unregister(debug_info_t* id); void debug_set_level(debug_info_t* id, int new_level); +void debug_set_critical(void); void debug_stop_all(void); static inline debug_entry_t* diff --git a/arch/s390/include/asm/ipl.h b/arch/s390/include/asm/ipl.h index 6940abf..2bd6cb8 100644 --- a/arch/s390/include/asm/ipl.h +++ b/arch/s390/include/asm/ipl.h @@ -169,5 +169,6 @@ enum diag308_rc { extern int diag308(unsigned long subcode, void *addr); extern void diag308_reset(void); extern void store_status(void); +extern void lgr_info_log(void); #endif /* _ASM_S390_IPL_H */ diff --git a/arch/s390/include/asm/system.h b/arch/s390/include/asm/system.h index d73cc6b..2e0bb7f 100644 --- a/arch/s390/include/asm/system.h +++ b/arch/s390/include/asm/system.h @@ -7,8 +7,10 @@ #ifndef __ASM_SYSTEM_H #define __ASM_SYSTEM_H +#include #include #include +#include #include #include #include @@ -248,6 +250,38 @@ static inline int test_facility(unsigned long nr) return (*ptr & (0x80 >> (nr & 7))) != 0; } +/** + * stfle - Store facility list extended + * @stfle_fac_list: array where facility list can be stored + * @size: size of passed in array in double words + */ +static inline void stfle(u64 *stfle_fac_list, int size) +{ + unsigned long nr; + + preempt_disable(); + S390_lowcore.stfl_fac_list = 0; + asm volatile( + " .insn s,0xb2b10000,0(0)\n" /* stfl */ + "0:\n" + EX_TABLE(0b, 0b) + : "=m" (S390_lowcore.stfl_fac_list)); + nr = 4; /* bytes stored by stfl */ + memcpy(stfle_fac_list, &S390_lowcore.stfl_fac_list, 4); + if (S390_lowcore.stfl_fac_list & 0x01000000) { + /* More facility bits available with stfle */ + register unsigned long reg0 asm("0") = size - 1; + + asm volatile(".insn s,0xb2b00000,0(%1)" /* stfle */ + : "+d" (reg0) + : "a" (stfle_fac_list) + : "memory", "cc"); + nr = (reg0 + 1) * 8; /* # bytes stored by stfle */ + } + memset((char *) stfle_fac_list + nr, 0, size * 8 - nr); + preempt_enable(); +} + static inline unsigned short stap(void) { unsigned short cpu_address; diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile index d0a4826..b215950 100644 --- a/arch/s390/kernel/Makefile +++ b/arch/s390/kernel/Makefile @@ -23,7 +23,7 @@ CFLAGS_sysinfo.o += -Iinclude/math-emu -Iarch/s390/math-emu -w obj-y := bitmap.o traps.o time.o process.o base.o early.o setup.o vtime.o \ processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o \ debug.o irq.o ipl.o dis.o diag.o mem_detect.o sclp.o vdso.o \ - sysinfo.o jump_label.o + sysinfo.o jump_label.o lgr.o obj-y += $(if $(CONFIG_64BIT),entry64.o,entry.o) obj-y += $(if $(CONFIG_64BIT),reipl64.o,reipl.o) diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c index 6848828..19e5e9e 100644 --- a/arch/s390/kernel/debug.c +++ b/arch/s390/kernel/debug.c @@ -2,8 +2,8 @@ * arch/s390/kernel/debug.c * S/390 debug facility * - * Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH, - * IBM Corporation + * Copyright IBM Corp. 1999, 2012 + * * Author(s): Michael Holzheu (holzheu@de.ibm.com), * Holger Smolinski (Holger.Smolinski@de.ibm.com) * @@ -167,6 +167,7 @@ static debug_info_t *debug_area_last = NULL; static DEFINE_MUTEX(debug_mutex); static int initialized; +static int debug_critical; static const struct file_operations debug_file_ops = { .owner = THIS_MODULE, @@ -932,6 +933,11 @@ debug_stop_all(void) } +void debug_set_critical(void) +{ + debug_critical = 1; +} + /* * debug_event_common: * - write debug entry with given size @@ -945,7 +951,11 @@ debug_event_common(debug_info_t * id, int level, const void *buf, int len) if (!debug_active || !id->areas) return NULL; - spin_lock_irqsave(&id->lock, flags); + if (debug_critical) { + if (!spin_trylock_irqsave(&id->lock, flags)) + return NULL; + } else + spin_lock_irqsave(&id->lock, flags); active = get_active_entry(id); memset(DEBUG_DATA(active), 0, id->buf_size); memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); @@ -968,7 +978,11 @@ debug_entry_t if (!debug_active || !id->areas) return NULL; - spin_lock_irqsave(&id->lock, flags); + if (debug_critical) { + if (!spin_trylock_irqsave(&id->lock, flags)) + return NULL; + } else + spin_lock_irqsave(&id->lock, flags); active = get_active_entry(id); memset(DEBUG_DATA(active), 0, id->buf_size); memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size)); @@ -1013,7 +1027,11 @@ debug_sprintf_event(debug_info_t* id, int level,char *string,...) return NULL; numargs=debug_count_numargs(string); - spin_lock_irqsave(&id->lock, flags); + if (debug_critical) { + if (!spin_trylock_irqsave(&id->lock, flags)) + return NULL; + } else + spin_lock_irqsave(&id->lock, flags); active = get_active_entry(id); curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active); va_start(ap,string); @@ -1047,7 +1065,11 @@ debug_sprintf_exception(debug_info_t* id, int level,char *string,...) numargs=debug_count_numargs(string); - spin_lock_irqsave(&id->lock, flags); + if (debug_critical) { + if (!spin_trylock_irqsave(&id->lock, flags)) + return NULL; + } else + spin_lock_irqsave(&id->lock, flags); active = get_active_entry(id); curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active); va_start(ap,string); @@ -1428,10 +1450,10 @@ debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view, rc += sprintf(out_buf + rc, "| "); for (i = 0; i < id->buf_size; i++) { unsigned char c = in_buf[i]; - if (!isprint(c)) - rc += sprintf(out_buf + rc, "."); - else + if (isascii(c) && isprint(c)) rc += sprintf(out_buf + rc, "%c", c); + else + rc += sprintf(out_buf + rc, "."); } rc += sprintf(out_buf + rc, "\n"); return rc; diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index 52098d6..578eb4e 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -29,6 +29,7 @@ #include #include #include +#include #include "entry.h" /* @@ -262,25 +263,8 @@ static noinline __init void setup_lowcore_early(void) static noinline __init void setup_facility_list(void) { - unsigned long nr; - - S390_lowcore.stfl_fac_list = 0; - asm volatile( - " .insn s,0xb2b10000,0(0)\n" /* stfl */ - "0:\n" - EX_TABLE(0b,0b) : "=m" (S390_lowcore.stfl_fac_list)); - memcpy(&S390_lowcore.stfle_fac_list, &S390_lowcore.stfl_fac_list, 4); - nr = 4; /* # bytes stored by stfl */ - if (test_facility(7)) { - /* More facility bits available with stfle */ - register unsigned long reg0 asm("0") = MAX_FACILITY_BIT/64 - 1; - asm volatile(".insn s,0xb2b00000,%0" /* stfle */ - : "=m" (S390_lowcore.stfle_fac_list), "+d" (reg0) - : : "cc"); - nr = (reg0 + 1) * 8; /* # bytes stored by stfle */ - } - memset((char *) S390_lowcore.stfle_fac_list + nr, 0, - MAX_FACILITY_BIT/8 - nr); + stfle(S390_lowcore.stfle_fac_list, + ARRAY_SIZE(S390_lowcore.stfle_fac_list)); } static noinline __init void setup_hpage(void) diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c index 9e2f6f7..153e21c 100644 --- a/arch/s390/kernel/ipl.c +++ b/arch/s390/kernel/ipl.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -26,6 +27,7 @@ #include #include #include +#include #include "entry.h" #define IPL_PARM_BLOCK_VERSION 0 @@ -1692,6 +1694,7 @@ static struct kobj_attribute on_panic_attr = static void do_panic(void) { + lgr_info_log(); on_panic_trigger.action->fn(&on_panic_trigger); stop_run(&on_panic_trigger); } @@ -1729,6 +1732,9 @@ static void __do_restart(void *ignore) void do_restart(void) { + tracing_off(); + debug_locks_off(); + lgr_info_log(); smp_call_online_cpu(__do_restart, NULL); } diff --git a/arch/s390/kernel/lgr.c b/arch/s390/kernel/lgr.c new file mode 100644 index 0000000..8431b92 --- /dev/null +++ b/arch/s390/kernel/lgr.c @@ -0,0 +1,200 @@ +/* + * Linux Guest Relocation (LGR) detection + * + * Copyright IBM Corp. 2012 + * Author(s): Michael Holzheu + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define LGR_TIMER_INTERVAL_SECS (30 * 60) +#define VM_LEVEL_MAX 2 /* Maximum is 8, but we only record two levels */ + +/* + * LGR info: Contains stfle and stsi data + */ +struct lgr_info { + /* Bit field with facility information: 4 DWORDs are stored */ + u64 stfle_fac_list[4]; + /* Level of system (1 = CEC, 2 = LPAR, 3 = z/VM */ + u32 level; + /* Level 1: CEC info (stsi 1.1.1) */ + char manufacturer[16]; + char type[4]; + char sequence[16]; + char plant[4]; + char model[16]; + /* Level 2: LPAR info (stsi 2.2.2) */ + u16 lpar_number; + char name[8]; + /* Level 3: VM info (stsi 3.2.2) */ + u8 vm_count; + struct { + char name[8]; + char cpi[16]; + } vm[VM_LEVEL_MAX]; +} __packed __aligned(8); + +/* + * LGR globals + */ +static void *lgr_page; +static struct lgr_info lgr_info_last; +static struct lgr_info lgr_info_cur; +static struct debug_info *lgr_dbf; + +/* + * Return number of valid stsi levels + */ +static inline int stsi_0(void) +{ + int rc = stsi(NULL, 0, 0, 0); + + return rc == -ENOSYS ? rc : (((unsigned int) rc) >> 28); +} + +/* + * Copy buffer and then convert it to ASCII + */ +static void cpascii(char *dst, char *src, int size) +{ + memcpy(dst, src, size); + EBCASC(dst, size); +} + +/* + * Fill LGR info with 1.1.1 stsi data + */ +static void lgr_stsi_1_1_1(struct lgr_info *lgr_info) +{ + struct sysinfo_1_1_1 *si = lgr_page; + + if (stsi(si, 1, 1, 1) == -ENOSYS) + return; + cpascii(lgr_info->manufacturer, si->manufacturer, + sizeof(si->manufacturer)); + cpascii(lgr_info->type, si->type, sizeof(si->type)); + cpascii(lgr_info->model, si->model, sizeof(si->model)); + cpascii(lgr_info->sequence, si->sequence, sizeof(si->sequence)); + cpascii(lgr_info->plant, si->plant, sizeof(si->plant)); +} + +/* + * Fill LGR info with 2.2.2 stsi data + */ +static void lgr_stsi_2_2_2(struct lgr_info *lgr_info) +{ + struct sysinfo_2_2_2 *si = lgr_page; + + if (stsi(si, 2, 2, 2) == -ENOSYS) + return; + cpascii(lgr_info->name, si->name, sizeof(si->name)); + memcpy(&lgr_info->lpar_number, &si->lpar_number, + sizeof(lgr_info->lpar_number)); +} + +/* + * Fill LGR info with 3.2.2 stsi data + */ +static void lgr_stsi_3_2_2(struct lgr_info *lgr_info) +{ + struct sysinfo_3_2_2 *si = lgr_page; + int i; + + if (stsi(si, 3, 2, 2) == -ENOSYS) + return; + for (i = 0; i < min_t(u8, si->count, VM_LEVEL_MAX); i++) { + cpascii(lgr_info->vm[i].name, si->vm[i].name, + sizeof(si->vm[i].name)); + cpascii(lgr_info->vm[i].cpi, si->vm[i].cpi, + sizeof(si->vm[i].cpi)); + } + lgr_info->vm_count = si->count; +} + +/* + * Fill LGR info with current data + */ +static void lgr_info_get(struct lgr_info *lgr_info) +{ + memset(lgr_info, 0, sizeof(*lgr_info)); + stfle(lgr_info->stfle_fac_list, ARRAY_SIZE(lgr_info->stfle_fac_list)); + lgr_info->level = stsi_0(); + if (lgr_info->level == -ENOSYS) + return; + if (lgr_info->level >= 1) + lgr_stsi_1_1_1(lgr_info); + if (lgr_info->level >= 2) + lgr_stsi_2_2_2(lgr_info); + if (lgr_info->level >= 3) + lgr_stsi_3_2_2(lgr_info); +} + +/* + * Check if LGR info has changed and if yes log new LGR info to s390dbf + */ +void lgr_info_log(void) +{ + static DEFINE_SPINLOCK(lgr_info_lock); + unsigned long flags; + + if (!spin_trylock_irqsave(&lgr_info_lock, flags)) + return; + lgr_info_get(&lgr_info_cur); + if (memcmp(&lgr_info_last, &lgr_info_cur, sizeof(lgr_info_cur)) != 0) { + debug_event(lgr_dbf, 1, &lgr_info_cur, sizeof(lgr_info_cur)); + lgr_info_last = lgr_info_cur; + } + spin_unlock_irqrestore(&lgr_info_lock, flags); +} +EXPORT_SYMBOL_GPL(lgr_info_log); + +static void lgr_timer_set(void); + +/* + * LGR timer callback + */ +static void lgr_timer_fn(unsigned long ignored) +{ + lgr_info_log(); + lgr_timer_set(); +} + +static struct timer_list lgr_timer = + TIMER_DEFERRED_INITIALIZER(lgr_timer_fn, 0, 0); + +/* + * Setup next LGR timer + */ +static void lgr_timer_set(void) +{ + mod_timer(&lgr_timer, jiffies + LGR_TIMER_INTERVAL_SECS * HZ); +} + +/* + * Initialize LGR: Add s390dbf, write initial lgr_info and setup timer + */ +static int __init lgr_init(void) +{ + lgr_page = (void *) __get_free_pages(GFP_KERNEL, 0); + if (!lgr_page) + return -ENOMEM; + lgr_dbf = debug_register("lgr", 1, 1, sizeof(struct lgr_info)); + if (!lgr_dbf) { + free_page((unsigned long) lgr_page); + return -ENOMEM; + } + debug_register_view(lgr_dbf, &debug_hex_ascii_view); + lgr_info_get(&lgr_info_last); + debug_event(lgr_dbf, 1, &lgr_info_last, sizeof(lgr_info_last)); + lgr_timer_set(); + return 0; +} +module_init(lgr_init); diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c index bf6fbc0..0f8cdf1 100644 --- a/arch/s390/kernel/machine_kexec.c +++ b/arch/s390/kernel/machine_kexec.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -209,10 +210,14 @@ static void __machine_kexec(void *data) struct kimage *image = data; pfault_fini(); - if (image->type == KEXEC_TYPE_CRASH) + tracing_off(); + debug_locks_off(); + if (image->type == KEXEC_TYPE_CRASH) { + lgr_info_log(); s390_reset_system(__do_machine_kdump, data); - else + } else { s390_reset_system(__do_machine_kexec, data); + } disabled_wait((unsigned long) __builtin_return_address(0)); } diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 734e644..d15b6c9 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -40,6 +40,7 @@ #include #include #include +#include #include "entry.h" enum { @@ -406,6 +407,7 @@ void smp_send_stop(void) __load_psw_mask(psw_kernel_bits | PSW_MASK_DAT); trace_hardirqs_off(); + debug_set_critical(); cpumask_copy(&cpumask, cpu_online_mask); cpumask_clear_cpu(smp_processor_id(), &cpumask); diff --git a/arch/s390/kernel/swsusp_asm64.S b/arch/s390/kernel/swsusp_asm64.S index ad3c79e..dd70ef0 100644 --- a/arch/s390/kernel/swsusp_asm64.S +++ b/arch/s390/kernel/swsusp_asm64.S @@ -257,6 +257,9 @@ restore_registers: lghi %r2,0 brasl %r14,arch_set_page_states + /* Log potential guest relocation */ + brasl %r14,lgr_info_log + /* Reinitialize the channel subsystem */ brasl %r14,channel_subsystem_reinit diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c index 5ce3750..8894ac4 100644 --- a/arch/s390/kernel/traps.c +++ b/arch/s390/kernel/traps.c @@ -41,6 +41,7 @@ #include #include #include +#include #include "entry.h" void (*pgm_check_table[128])(struct pt_regs *regs); @@ -239,6 +240,7 @@ void die(struct pt_regs *regs, const char *str) static int die_counter; oops_enter(); + lgr_info_log(); debug_stop_all(); console_verbose(); spin_lock_irq(&die_lock); diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c index 770a740..2a0dfcb 100644 --- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -18,6 +18,7 @@ #include #include #include +#include #include "cio.h" #include "css.h" @@ -1093,6 +1094,11 @@ static void qdio_handle_activate_check(struct ccw_device *cdev, q->nr, q->first_to_kick, count, irq_ptr->int_parm); no_handler: qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED); + /* + * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen. + * Therefore we call the LGR detection function here. + */ + lgr_info_log(); } static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat, -- cgit v0.10.2 From ad252ffa2a0fbb1f37e81688322034b3af037cee Mon Sep 17 00:00:00 2001 From: Matt Fleming Date: Sun, 11 Mar 2012 11:59:33 -0400 Subject: [S390] Use block_sigmask() Use the new helper function introduced in commit 5e6292c0f28f ("signal: add block_sigmask() for adding sigmask to current->blocked") which centralises the code for updating current->blocked after successfully delivering a signal and reduces the amount of duplicate code across architectures. In the past some architectures got this code wrong, so using this helper function should stop that from happening again. Cc: Oleg Nesterov Acked-by: Martin Schwidefsky Cc: linux-s390@vger.kernel.org Signed-off-by: Matt Fleming Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky diff --git a/arch/s390/kernel/compat_signal.c b/arch/s390/kernel/compat_signal.c index 6fe78c2..53a82c8 100644 --- a/arch/s390/kernel/compat_signal.c +++ b/arch/s390/kernel/compat_signal.c @@ -581,7 +581,6 @@ give_sigsegv: int handle_signal32(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) { - sigset_t blocked; int ret; /* Set up the stack frame */ @@ -591,10 +590,7 @@ int handle_signal32(unsigned long sig, struct k_sigaction *ka, ret = setup_frame32(sig, ka, oldset, regs); if (ret) return ret; - sigorsets(&blocked, ¤t->blocked, &ka->sa.sa_mask); - if (!(ka->sa.sa_flags & SA_NODEFER)) - sigaddset(&blocked, sig); - set_current_blocked(&blocked); + block_sigmask(ka, sig); return 0; } diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c index 2d421d9..f29f5ef 100644 --- a/arch/s390/kernel/signal.c +++ b/arch/s390/kernel/signal.c @@ -384,7 +384,6 @@ static int handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *oldset, struct pt_regs *regs) { - sigset_t blocked; int ret; /* Set up the stack frame */ @@ -394,10 +393,7 @@ static int handle_signal(unsigned long sig, struct k_sigaction *ka, ret = setup_frame(sig, ka, oldset, regs); if (ret) return ret; - sigorsets(&blocked, ¤t->blocked, &ka->sa.sa_mask); - if (!(ka->sa.sa_flags & SA_NODEFER)) - sigaddset(&blocked, sig); - set_current_blocked(&blocked); + block_sigmask(ka, sig); return 0; } -- cgit v0.10.2 From 4857d4bbe9821c8d732cb84455e18e12b3d79add Mon Sep 17 00:00:00 2001 From: Michael Holzheu Date: Sun, 11 Mar 2012 11:59:34 -0400 Subject: [S390] kernel: Add OS info memory interface In order to allow kdump based stand-alone dump, some information has to be passed from the old kernel to the new dump kernel. This is done via a the struct "os_info" that contains the following fields: * crashkernel base and size * reipl block * vmcoreinfo * init function A pointer to os_info is stored at a well known storage location and the whole structure as well as all fields are secured with checksums. Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h index 4e69563..a47c6e2 100644 --- a/arch/s390/include/asm/lowcore.h +++ b/arch/s390/include/asm/lowcore.h @@ -154,7 +154,9 @@ struct _lowcore { __u32 ipib; /* 0x0e00 */ __u32 ipib_checksum; /* 0x0e04 */ __u32 vmcore_info; /* 0x0e08 */ - __u8 pad_0x0e0c[0x0f00-0x0e0c]; /* 0x0e0c */ + __u8 pad_0x0e0c[0x0e18-0x0e0c]; /* 0x0e0c */ + __u32 os_info; /* 0x0e18 */ + __u8 pad_0x0e1c[0x0f00-0x0e1c]; /* 0x0e1c */ /* Extended facility list */ __u64 stfle_fac_list[32]; /* 0x0f00 */ @@ -301,7 +303,9 @@ struct _lowcore { __u64 ipib; /* 0x0e00 */ __u32 ipib_checksum; /* 0x0e08 */ __u64 vmcore_info; /* 0x0e0c */ - __u8 pad_0x0e14[0x0f00-0x0e14]; /* 0x0e14 */ + __u8 pad_0x0e14[0x0e18-0x0e14]; /* 0x0e14 */ + __u64 os_info; /* 0x0e18 */ + __u8 pad_0x0e20[0x0f00-0x0e20]; /* 0x0e20 */ /* Extended facility list */ __u64 stfle_fac_list[32]; /* 0x0f00 */ diff --git a/arch/s390/include/asm/os_info.h b/arch/s390/include/asm/os_info.h new file mode 100644 index 0000000..d07518a --- /dev/null +++ b/arch/s390/include/asm/os_info.h @@ -0,0 +1,50 @@ +/* + * OS info memory interface + * + * Copyright IBM Corp. 2012 + * Author(s): Michael Holzheu + */ +#ifndef _ASM_S390_OS_INFO_H +#define _ASM_S390_OS_INFO_H + +#define OS_INFO_VERSION_MAJOR 1 +#define OS_INFO_VERSION_MINOR 1 +#define OS_INFO_MAGIC 0x4f53494e464f535aULL /* OSINFOSZ */ + +#define OS_INFO_VMCOREINFO 0 +#define OS_INFO_REIPL_BLOCK 1 +#define OS_INFO_INIT_FN 2 + +struct os_info_entry { + u64 addr; + u64 size; + u32 csum; +} __packed; + +struct os_info { + u64 magic; + u32 csum; + u16 version_major; + u16 version_minor; + u64 crashkernel_addr; + u64 crashkernel_size; + struct os_info_entry entry[3]; + u8 reserved[4004]; +} __packed; + +void os_info_init(void); +void os_info_entry_add(int nr, void *ptr, u64 len); +void os_info_crashkernel_add(unsigned long base, unsigned long size); +u32 os_info_csum(struct os_info *os_info); + +#ifdef CONFIG_CRASH_DUMP +void *os_info_old_entry(int nr, unsigned long *size); +int copy_from_oldmem(void *dest, void *src, size_t count); +#else +static inline void *os_info_old_entry(int nr, unsigned long *size) +{ + return NULL; +} +#endif + +#endif /* _ASM_S390_OS_INFO_H */ diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile index b215950..16b0b43 100644 --- a/arch/s390/kernel/Makefile +++ b/arch/s390/kernel/Makefile @@ -23,7 +23,7 @@ CFLAGS_sysinfo.o += -Iinclude/math-emu -Iarch/s390/math-emu -w obj-y := bitmap.o traps.o time.o process.o base.o early.o setup.o vtime.o \ processor.o sys_s390.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o \ debug.o irq.o ipl.o dis.o diag.o mem_detect.o sclp.o vdso.o \ - sysinfo.o jump_label.o lgr.o + sysinfo.o jump_label.o lgr.o os_info.o obj-y += $(if $(CONFIG_64BIT),entry64.o,entry.o) obj-y += $(if $(CONFIG_64BIT),reipl64.o,reipl.o) diff --git a/arch/s390/kernel/crash_dump.c b/arch/s390/kernel/crash_dump.c index c383ce4..cc1172b 100644 --- a/arch/s390/kernel/crash_dump.c +++ b/arch/s390/kernel/crash_dump.c @@ -14,6 +14,7 @@ #include #include #include +#include #define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y))) #define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y))) @@ -51,7 +52,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, /* * Copy memory from old kernel */ -static int copy_from_oldmem(void *dest, void *src, size_t count) +int copy_from_oldmem(void *dest, void *src, size_t count) { unsigned long copied = 0; int rc; @@ -224,28 +225,44 @@ static void *nt_prpsinfo(void *ptr) } /* - * Initialize vmcoreinfo note (new kernel) + * Get vmcoreinfo using lowcore->vmcore_info (new kernel) */ -static void *nt_vmcoreinfo(void *ptr) +static void *get_vmcoreinfo_old(unsigned long *size) { char nt_name[11], *vmcoreinfo; Elf64_Nhdr note; void *addr; if (copy_from_oldmem(&addr, &S390_lowcore.vmcore_info, sizeof(addr))) - return ptr; + return NULL; memset(nt_name, 0, sizeof(nt_name)); if (copy_from_oldmem(¬e, addr, sizeof(note))) - return ptr; + return NULL; if (copy_from_oldmem(nt_name, addr + sizeof(note), sizeof(nt_name) - 1)) - return ptr; + return NULL; if (strcmp(nt_name, "VMCOREINFO") != 0) - return ptr; - vmcoreinfo = kzalloc_panic(note.n_descsz + 1); + return NULL; + vmcoreinfo = kzalloc_panic(note.n_descsz); if (copy_from_oldmem(vmcoreinfo, addr + 24, note.n_descsz)) + return NULL; + *size = note.n_descsz; + return vmcoreinfo; +} + +/* + * Initialize vmcoreinfo note (new kernel) + */ +static void *nt_vmcoreinfo(void *ptr) +{ + unsigned long size; + void *vmcoreinfo; + + vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size); + if (!vmcoreinfo) + vmcoreinfo = get_vmcoreinfo_old(&size); + if (!vmcoreinfo) return ptr; - vmcoreinfo[note.n_descsz + 1] = 0; - return nt_init(ptr, 0, vmcoreinfo, note.n_descsz, "VMCOREINFO"); + return nt_init(ptr, 0, vmcoreinfo, size, "VMCOREINFO"); } /* diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c index 153e21c..8342e65 100644 --- a/arch/s390/kernel/ipl.c +++ b/arch/s390/kernel/ipl.c @@ -28,6 +28,7 @@ #include #include #include +#include #include "entry.h" #define IPL_PARM_BLOCK_VERSION 0 @@ -951,6 +952,13 @@ static struct attribute_group reipl_nss_attr_group = { .attrs = reipl_nss_attrs, }; +static void set_reipl_block_actual(struct ipl_parameter_block *reipl_block) +{ + reipl_block_actual = reipl_block; + os_info_entry_add(OS_INFO_REIPL_BLOCK, reipl_block_actual, + reipl_block->hdr.len); +} + /* reipl type */ static int reipl_set_type(enum ipl_type type) @@ -966,7 +974,7 @@ static int reipl_set_type(enum ipl_type type) reipl_method = REIPL_METHOD_CCW_VM; else reipl_method = REIPL_METHOD_CCW_CIO; - reipl_block_actual = reipl_block_ccw; + set_reipl_block_actual(reipl_block_ccw); break; case IPL_TYPE_FCP: if (diag308_set_works) @@ -975,7 +983,7 @@ static int reipl_set_type(enum ipl_type type) reipl_method = REIPL_METHOD_FCP_RO_VM; else reipl_method = REIPL_METHOD_FCP_RO_DIAG; - reipl_block_actual = reipl_block_fcp; + set_reipl_block_actual(reipl_block_fcp); break; case IPL_TYPE_FCP_DUMP: reipl_method = REIPL_METHOD_FCP_DUMP; @@ -985,7 +993,7 @@ static int reipl_set_type(enum ipl_type type) reipl_method = REIPL_METHOD_NSS_DIAG; else reipl_method = REIPL_METHOD_NSS; - reipl_block_actual = reipl_block_nss; + set_reipl_block_actual(reipl_block_nss); break; case IPL_TYPE_UNKNOWN: reipl_method = REIPL_METHOD_DEFAULT; @@ -1257,6 +1265,29 @@ static int __init reipl_fcp_init(void) return 0; } +static int __init reipl_type_init(void) +{ + enum ipl_type reipl_type = ipl_info.type; + struct ipl_parameter_block *reipl_block; + unsigned long size; + + reipl_block = os_info_old_entry(OS_INFO_REIPL_BLOCK, &size); + if (!reipl_block) + goto out; + /* + * If we have an OS info reipl block, this will be used + */ + if (reipl_block->hdr.pbt == DIAG308_IPL_TYPE_FCP) { + memcpy(reipl_block_fcp, reipl_block, size); + reipl_type = IPL_TYPE_FCP; + } else if (reipl_block->hdr.pbt == DIAG308_IPL_TYPE_CCW) { + memcpy(reipl_block_ccw, reipl_block, size); + reipl_type = IPL_TYPE_CCW; + } +out: + return reipl_set_type(reipl_type); +} + static int __init reipl_init(void) { int rc; @@ -1278,10 +1309,7 @@ static int __init reipl_init(void) rc = reipl_nss_init(); if (rc) return rc; - rc = reipl_set_type(ipl_info.type); - if (rc) - return rc; - return 0; + return reipl_type_init(); } static struct shutdown_action __refdata reipl_action = { diff --git a/arch/s390/kernel/os_info.c b/arch/s390/kernel/os_info.c new file mode 100644 index 0000000..bbe5226 --- /dev/null +++ b/arch/s390/kernel/os_info.c @@ -0,0 +1,169 @@ +/* + * OS info memory interface + * + * Copyright IBM Corp. 2012 + * Author(s): Michael Holzheu + */ + +#define KMSG_COMPONENT "os_info" +#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt + +#include +#include +#include +#include +#include +#include + +/* + * OS info structure has to be page aligned + */ +static struct os_info os_info __page_aligned_data; + +/* + * Compute checksum over OS info structure + */ +u32 os_info_csum(struct os_info *os_info) +{ + int size = sizeof(*os_info) - offsetof(struct os_info, version_major); + return csum_partial(&os_info->version_major, size, 0); +} + +/* + * Add crashkernel info to OS info and update checksum + */ +void os_info_crashkernel_add(unsigned long base, unsigned long size) +{ + os_info.crashkernel_addr = (u64)(unsigned long)base; + os_info.crashkernel_size = (u64)(unsigned long)size; + os_info.csum = os_info_csum(&os_info); +} + +/* + * Add OS info entry and update checksum + */ +void os_info_entry_add(int nr, void *ptr, u64 size) +{ + os_info.entry[nr].addr = (u64)(unsigned long)ptr; + os_info.entry[nr].size = size; + os_info.entry[nr].csum = csum_partial(ptr, size, 0); + os_info.csum = os_info_csum(&os_info); +} + +/* + * Initialize OS info struture and set lowcore pointer + */ +void __init os_info_init(void) +{ + void *ptr = &os_info; + + os_info.version_major = OS_INFO_VERSION_MAJOR; + os_info.version_minor = OS_INFO_VERSION_MINOR; + os_info.magic = OS_INFO_MAGIC; + os_info.csum = os_info_csum(&os_info); + copy_to_absolute_zero(&S390_lowcore.os_info, &ptr, sizeof(ptr)); +} + +#ifdef CONFIG_CRASH_DUMP + +static struct os_info *os_info_old; + +/* + * Allocate and copy OS info entry from oldmem + */ +static void os_info_old_alloc(int nr, int align) +{ + unsigned long addr, size = 0; + char *buf, *buf_align, *msg; + u32 csum; + + addr = os_info_old->entry[nr].addr; + if (!addr) { + msg = "not available"; + goto fail; + } + size = os_info_old->entry[nr].size; + buf = kmalloc(size + align - 1, GFP_KERNEL); + if (!buf) { + msg = "alloc failed"; + goto fail; + } + buf_align = PTR_ALIGN(buf, align); + if (copy_from_oldmem(buf_align, (void *) addr, size)) { + msg = "copy failed"; + goto fail_free; + } + csum = csum_partial(buf_align, size, 0); + if (csum != os_info_old->entry[nr].csum) { + msg = "checksum failed"; + goto fail_free; + } + os_info_old->entry[nr].addr = (u64)(unsigned long)buf_align; + msg = "copied"; + goto out; +fail_free: + kfree(buf); +fail: + os_info_old->entry[nr].addr = 0; +out: + pr_info("entry %i: %s (addr=0x%lx size=%lu)\n", + nr, msg, addr, size); +} + +/* + * Initialize os info and os info entries from oldmem + */ +static void os_info_old_init(void) +{ + static int os_info_init; + unsigned long addr; + + if (os_info_init) + return; + if (!OLDMEM_BASE) + goto fail; + if (copy_from_oldmem(&addr, &S390_lowcore.os_info, sizeof(addr))) + goto fail; + if (addr == 0 || addr % PAGE_SIZE) + goto fail; + os_info_old = kzalloc(sizeof(*os_info_old), GFP_KERNEL); + if (!os_info_old) + goto fail; + if (copy_from_oldmem(os_info_old, (void *) addr, sizeof(*os_info_old))) + goto fail_free; + if (os_info_old->magic != OS_INFO_MAGIC) + goto fail_free; + if (os_info_old->csum != os_info_csum(os_info_old)) + goto fail_free; + if (os_info_old->version_major > OS_INFO_VERSION_MAJOR) + goto fail_free; + os_info_old_alloc(OS_INFO_VMCOREINFO, 1); + os_info_old_alloc(OS_INFO_REIPL_BLOCK, 1); + os_info_old_alloc(OS_INFO_INIT_FN, PAGE_SIZE); + pr_info("crashkernel: addr=0x%lx size=%lu\n", + (unsigned long) os_info_old->crashkernel_addr, + (unsigned long) os_info_old->crashkernel_size); + os_info_init = 1; + return; +fail_free: + kfree(os_info_old); +fail: + os_info_init = 1; + os_info_old = NULL; +} + +/* + * Return pointer to os infor entry and its size + */ +void *os_info_old_entry(int nr, unsigned long *size) +{ + os_info_old_init(); + + if (!os_info_old) + return NULL; + if (!os_info_old->entry[nr].addr) + return NULL; + *size = (unsigned long) os_info_old->entry[nr].size; + return (void *)(unsigned long)os_info_old->entry[nr].addr; +} +#endif diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 9a3edb5..38e7512 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -62,6 +62,7 @@ #include #include #include +#include #include "entry.h" long psw_kernel_bits = PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_PRIMARY | @@ -778,6 +779,7 @@ static void __init reserve_crashkernel(void) pr_info("Reserving %lluMB of memory at %lluMB " "for crashkernel (System RAM: %luMB)\n", crash_size >> 20, crash_base >> 20, memory_end >> 20); + os_info_crashkernel_add(crash_base, crash_size); #endif } @@ -1057,6 +1059,7 @@ void __init setup_arch(char **cmdline_p) parse_early_param(); + os_info_init(); setup_ipl(); setup_memory_end(); setup_addressing_mode(); diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index d15b6c9..3b9e5c9 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -41,6 +41,7 @@ #include #include #include +#include #include "entry.h" enum { @@ -826,6 +827,17 @@ void __noreturn cpu_die(void) #endif /* CONFIG_HOTPLUG_CPU */ +static void smp_call_os_info_init_fn(void) +{ + int (*init_fn)(void); + unsigned long size; + + init_fn = os_info_old_entry(OS_INFO_INIT_FN, &size); + if (!init_fn) + return; + init_fn(); +} + void __init smp_prepare_cpus(unsigned int max_cpus) { /* request the 0x1201 emergency signal external interrupt */ @@ -834,6 +846,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus) /* request the 0x1202 external call external interrupt */ if (register_external_interrupt(0x1202, do_ext_call_interrupt) != 0) panic("Couldn't request external interrupt 0x1202"); + smp_call_os_info_init_fn(); smp_detect_cpus(); } -- cgit v0.10.2 From ddadfa8d279e17b5afe8aa76846363c940df0435 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Sun, 11 Mar 2012 11:59:35 -0400 Subject: [S390] stack dump: fix indentation in output The first line of a stack dump has a wrong (no) indentation. Just fix this after more than 10 years. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c index 8894ac4..cd6ebe1 100644 --- a/arch/s390/kernel/traps.c +++ b/arch/s390/kernel/traps.c @@ -145,8 +145,8 @@ void show_stack(struct task_struct *task, unsigned long *sp) for (i = 0; i < kstack_depth_to_print; i++) { if (((addr_t) stack & (THREAD_SIZE-1)) == 0) break; - if (i && ((i * sizeof (long) % 32) == 0)) - printk("\n "); + if ((i * sizeof(long) % 32) == 0) + printk("%s ", i == 0 ? "" : "\n"); printk(LONG, *stack++); } printk("\n"); -- cgit v0.10.2 From 35424f636e9b6e79a362162aaac96b12cc8e8f69 Mon Sep 17 00:00:00 2001 From: Holger Dengler Date: Sun, 11 Mar 2012 11:59:36 -0400 Subject: [S390] Remove monolithic build option for zcrypt driver. Remove the option to build a single module z90crypt that contains ap bus, request router and card drivers. Signed-off-by: Holger Dengler Signed-off-by: Martin Schwidefsky diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig index 6d16b4b..f180b22 100644 --- a/drivers/crypto/Kconfig +++ b/drivers/crypto/Kconfig @@ -64,7 +64,6 @@ config CRYPTO_DEV_GEODE config ZCRYPT tristate "Support for PCI-attached cryptographic adapters" depends on S390 - select ZCRYPT_MONOLITHIC if ZCRYPT="y" select HW_RANDOM help Select this option if you want to use a PCI-attached cryptographic @@ -77,14 +76,6 @@ config ZCRYPT + Crypto Express3 Coprocessor (CEX3C) + Crypto Express3 Accelerator (CEX3A) -config ZCRYPT_MONOLITHIC - bool "Monolithic zcrypt module" - depends on ZCRYPT - help - Select this option if you want to have a single module z90crypt, - that contains all parts of the crypto device driver (ap bus, - request router and all the card drivers). - config CRYPTO_SHA1_S390 tristate "SHA1 digest algorithm" depends on S390 diff --git a/drivers/s390/crypto/Makefile b/drivers/s390/crypto/Makefile index f0a12d2..af3c7f1 100644 --- a/drivers/s390/crypto/Makefile +++ b/drivers/s390/crypto/Makefile @@ -2,16 +2,6 @@ # S/390 crypto devices # -ifdef CONFIG_ZCRYPT_MONOLITHIC - -z90crypt-objs := zcrypt_mono.o ap_bus.o zcrypt_api.o \ - zcrypt_pcica.o zcrypt_pcicc.o zcrypt_pcixcc.o zcrypt_cex2a.o -obj-$(CONFIG_ZCRYPT) += z90crypt.o - -else - ap-objs := ap_bus.o obj-$(CONFIG_ZCRYPT) += ap.o zcrypt_api.o zcrypt_pcicc.o zcrypt_pcixcc.o obj-$(CONFIG_ZCRYPT) += zcrypt_pcica.o zcrypt_cex2a.o - -endif diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c index 96bbe9d..12ae181 100644 --- a/drivers/s390/crypto/ap_bus.c +++ b/drivers/s390/crypto/ap_bus.c @@ -1862,7 +1862,5 @@ void ap_module_exit(void) } } -#ifndef CONFIG_ZCRYPT_MONOLITHIC module_init(ap_module_init); module_exit(ap_module_exit); -#endif diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c index 88ad33e..8852320 100644 --- a/drivers/s390/crypto/zcrypt_api.c +++ b/drivers/s390/crypto/zcrypt_api.c @@ -1220,7 +1220,5 @@ void zcrypt_api_exit(void) misc_deregister(&zcrypt_misc_device); } -#ifndef CONFIG_ZCRYPT_MONOLITHIC module_init(zcrypt_api_init); module_exit(zcrypt_api_exit); -#endif diff --git a/drivers/s390/crypto/zcrypt_cex2a.c b/drivers/s390/crypto/zcrypt_cex2a.c index da171b5..0842867 100644 --- a/drivers/s390/crypto/zcrypt_cex2a.c +++ b/drivers/s390/crypto/zcrypt_cex2a.c @@ -63,13 +63,11 @@ static struct ap_device_id zcrypt_cex2a_ids[] = { { /* end of list */ }, }; -#ifndef CONFIG_ZCRYPT_MONOLITHIC MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_ids); MODULE_AUTHOR("IBM Corporation"); MODULE_DESCRIPTION("CEX2A Cryptographic Coprocessor device driver, " "Copyright 2001, 2006 IBM Corporation"); MODULE_LICENSE("GPL"); -#endif static int zcrypt_cex2a_probe(struct ap_device *ap_dev); static void zcrypt_cex2a_remove(struct ap_device *ap_dev); @@ -496,7 +494,5 @@ void __exit zcrypt_cex2a_exit(void) ap_driver_unregister(&zcrypt_cex2a_driver); } -#ifndef CONFIG_ZCRYPT_MONOLITHIC module_init(zcrypt_cex2a_init); module_exit(zcrypt_cex2a_exit); -#endif diff --git a/drivers/s390/crypto/zcrypt_mono.c b/drivers/s390/crypto/zcrypt_mono.c deleted file mode 100644 index eb313c3..0000000 --- a/drivers/s390/crypto/zcrypt_mono.c +++ /dev/null @@ -1,100 +0,0 @@ -/* - * linux/drivers/s390/crypto/zcrypt_mono.c - * - * zcrypt 2.1.0 - * - * Copyright (C) 2001, 2006 IBM Corporation - * Author(s): Robert Burroughs - * Eric Rossman (edrossma@us.ibm.com) - * - * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) - * Major cleanup & driver split: Martin Schwidefsky - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2, or (at your option) - * any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "ap_bus.h" -#include "zcrypt_api.h" -#include "zcrypt_pcica.h" -#include "zcrypt_pcicc.h" -#include "zcrypt_pcixcc.h" -#include "zcrypt_cex2a.h" - -/** - * The module initialization code. - */ -static int __init zcrypt_init(void) -{ - int rc; - - rc = ap_module_init(); - if (rc) - goto out; - rc = zcrypt_api_init(); - if (rc) - goto out_ap; - rc = zcrypt_pcica_init(); - if (rc) - goto out_api; - rc = zcrypt_pcicc_init(); - if (rc) - goto out_pcica; - rc = zcrypt_pcixcc_init(); - if (rc) - goto out_pcicc; - rc = zcrypt_cex2a_init(); - if (rc) - goto out_pcixcc; - return 0; - -out_pcixcc: - zcrypt_pcixcc_exit(); -out_pcicc: - zcrypt_pcicc_exit(); -out_pcica: - zcrypt_pcica_exit(); -out_api: - zcrypt_api_exit(); -out_ap: - ap_module_exit(); -out: - return rc; -} - -/** - * The module termination code. - */ -static void __exit zcrypt_exit(void) -{ - zcrypt_cex2a_exit(); - zcrypt_pcixcc_exit(); - zcrypt_pcicc_exit(); - zcrypt_pcica_exit(); - zcrypt_api_exit(); - ap_module_exit(); -} - -module_init(zcrypt_init); -module_exit(zcrypt_exit); diff --git a/drivers/s390/crypto/zcrypt_pcica.c b/drivers/s390/crypto/zcrypt_pcica.c index d84816f..0effca9 100644 --- a/drivers/s390/crypto/zcrypt_pcica.c +++ b/drivers/s390/crypto/zcrypt_pcica.c @@ -53,13 +53,11 @@ static struct ap_device_id zcrypt_pcica_ids[] = { { /* end of list */ }, }; -#ifndef CONFIG_ZCRYPT_MONOLITHIC MODULE_DEVICE_TABLE(ap, zcrypt_pcica_ids); MODULE_AUTHOR("IBM Corporation"); MODULE_DESCRIPTION("PCICA Cryptographic Coprocessor device driver, " "Copyright 2001, 2006 IBM Corporation"); MODULE_LICENSE("GPL"); -#endif static int zcrypt_pcica_probe(struct ap_device *ap_dev); static void zcrypt_pcica_remove(struct ap_device *ap_dev); @@ -408,7 +406,5 @@ void zcrypt_pcica_exit(void) ap_driver_unregister(&zcrypt_pcica_driver); } -#ifndef CONFIG_ZCRYPT_MONOLITHIC module_init(zcrypt_pcica_init); module_exit(zcrypt_pcica_exit); -#endif diff --git a/drivers/s390/crypto/zcrypt_pcicc.c b/drivers/s390/crypto/zcrypt_pcicc.c index bdbdbe1..f9523c0 100644 --- a/drivers/s390/crypto/zcrypt_pcicc.c +++ b/drivers/s390/crypto/zcrypt_pcicc.c @@ -65,13 +65,11 @@ static struct ap_device_id zcrypt_pcicc_ids[] = { { /* end of list */ }, }; -#ifndef CONFIG_ZCRYPT_MONOLITHIC MODULE_DEVICE_TABLE(ap, zcrypt_pcicc_ids); MODULE_AUTHOR("IBM Corporation"); MODULE_DESCRIPTION("PCICC Cryptographic Coprocessor device driver, " "Copyright 2001, 2006 IBM Corporation"); MODULE_LICENSE("GPL"); -#endif static int zcrypt_pcicc_probe(struct ap_device *ap_dev); static void zcrypt_pcicc_remove(struct ap_device *ap_dev); @@ -614,7 +612,5 @@ void zcrypt_pcicc_exit(void) ap_driver_unregister(&zcrypt_pcicc_driver); } -#ifndef CONFIG_ZCRYPT_MONOLITHIC module_init(zcrypt_pcicc_init); module_exit(zcrypt_pcicc_exit); -#endif diff --git a/drivers/s390/crypto/zcrypt_pcixcc.c b/drivers/s390/crypto/zcrypt_pcixcc.c index 077b7d1..cf1cbd4 100644 --- a/drivers/s390/crypto/zcrypt_pcixcc.c +++ b/drivers/s390/crypto/zcrypt_pcixcc.c @@ -75,13 +75,11 @@ static struct ap_device_id zcrypt_pcixcc_ids[] = { { /* end of list */ }, }; -#ifndef CONFIG_ZCRYPT_MONOLITHIC MODULE_DEVICE_TABLE(ap, zcrypt_pcixcc_ids); MODULE_AUTHOR("IBM Corporation"); MODULE_DESCRIPTION("PCIXCC Cryptographic Coprocessor device driver, " "Copyright 2001, 2006 IBM Corporation"); MODULE_LICENSE("GPL"); -#endif static int zcrypt_pcixcc_probe(struct ap_device *ap_dev); static void zcrypt_pcixcc_remove(struct ap_device *ap_dev); @@ -1121,7 +1119,5 @@ void zcrypt_pcixcc_exit(void) ap_driver_unregister(&zcrypt_pcixcc_driver); } -#ifndef CONFIG_ZCRYPT_MONOLITHIC module_init(zcrypt_pcixcc_init); module_exit(zcrypt_pcixcc_exit); -#endif -- cgit v0.10.2 From 25e2cf1c1ac52d5078cf8cc3fd2f2ad084669ddd Mon Sep 17 00:00:00 2001 From: Stefan Haberland Date: Sun, 11 Mar 2012 11:59:37 -0400 Subject: [S390] dasd: prevent validate server for offline devices Calling validate server on devices in offline processing may cause an OOPS in the dasd_sleep_on function. Signed-off-by: Stefan Haberland Reviewed-by: Stefan Weinhuber Signed-off-by: Martin Schwidefsky diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 110137e..f350912 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -640,6 +640,10 @@ void dasd_enable_device(struct dasd_device *device) dasd_set_target_state(device, DASD_STATE_NEW); /* Now wait for the devices to come up. */ wait_event(dasd_init_waitq, _wait_for_device(device)); + + dasd_reload_device(device); + if (device->discipline->kick_validate) + device->discipline->kick_validate(device); } /* diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index 2617b1e..c21871a 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -1564,6 +1564,12 @@ static void dasd_eckd_do_validate_server(struct work_struct *work) static void dasd_eckd_kick_validate_server(struct dasd_device *device) { dasd_get_device(device); + /* exit if device not online or in offline processing */ + if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || + device->state < DASD_STATE_ONLINE) { + dasd_put_device(device); + return; + } /* queue call to do_validate_server to the kernel event daemon. */ schedule_work(&device->kick_validate); } @@ -1993,6 +1999,7 @@ static int dasd_eckd_ready_to_online(struct dasd_device *device) static int dasd_eckd_online_to_ready(struct dasd_device *device) { cancel_work_sync(&device->reload_device); + cancel_work_sync(&device->kick_validate); return dasd_alias_remove_device(device); }; @@ -2263,6 +2270,7 @@ static void dasd_eckd_check_for_device_change(struct dasd_device *device, * and only if not suspended */ if (!device->block && private->lcu && + device->state == DASD_STATE_ONLINE && !test_bit(DASD_FLAG_OFFLINE, &device->flags) && !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) { /* -- cgit v0.10.2 From f5bfa159d20c9a25c44a7f848c70d4156f78ba64 Mon Sep 17 00:00:00 2001 From: Michael Holzheu Date: Sun, 11 Mar 2012 11:59:38 -0400 Subject: [S390] Ensure that vmcore_info pointer is never accessed directly Because the vmcore_info pointer is not 8 byte aligned it never should not be accessed directly. The reason is that the compiler assumes that 64 bit pointer are always double word aligned. To ensure save access, the vmcore_info type in struct lowcore is changed from u64 to an u8[8] array and a comment is added. Signed-off-by: Michael Holzheu Reported-by: Heiko Carstens Signed-off-by: Martin Schwidefsky diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h index a47c6e2..47853de 100644 --- a/arch/s390/include/asm/lowcore.h +++ b/arch/s390/include/asm/lowcore.h @@ -302,7 +302,12 @@ struct _lowcore { */ __u64 ipib; /* 0x0e00 */ __u32 ipib_checksum; /* 0x0e08 */ - __u64 vmcore_info; /* 0x0e0c */ + /* + * Because the vmcore_info pointer is not 8 byte aligned it never + * should not be accessed directly. For accessing the pointer, first + * copy it to a local pointer variable. + */ + __u8 vmcore_info[8]; /* 0x0e0c */ __u8 pad_0x0e14[0x0e18-0x0e14]; /* 0x0e14 */ __u64 os_info; /* 0x0e18 */ __u8 pad_0x0e20[0x0f00-0x0e20]; /* 0x0e20 */ -- cgit v0.10.2 From c6da39f26cfe475704ec521723192e520e8f51b8 Mon Sep 17 00:00:00 2001 From: Michael Holzheu Date: Tue, 13 Mar 2012 11:25:08 -0400 Subject: [S390] kernel: Pass correct stack for smp_call_ipl_cpu() Currently pcpu_devices->panic_stack is passed to pcpu_delegate() in smp_call_ipl_cpu(). This is wrong because pcpu_delegate() expects the bottom (high address) of the stack and pcpu_devices->panic_stack points to the top (low address). We now pass the bottom of the stack which is pcpu_devices->panic_stack + PAGE_SIZE. Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 3b9e5c9..64ebbcb 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -335,7 +335,8 @@ void smp_call_online_cpu(void (*func)(void *), void *data) */ void smp_call_ipl_cpu(void (*func)(void *), void *data) { - pcpu_delegate(&pcpu_devices[0], func, data, pcpu_devices->panic_stack); + pcpu_delegate(&pcpu_devices[0], func, data, + pcpu_devices->panic_stack + PAGE_SIZE); } int smp_find_processor_id(u16 address) -- cgit v0.10.2