Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 376 insertions, 0 deletions

diff --git a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c
new file mode 100644
index 0000000..953095e
--- /dev/null
+++ b/arch/ia64/kernel/smp.c
@@ -0,0 +1,376 @@
+/*
+ * SMP Support
+ *
+ * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
+ * Copyright (C) 1999, 2001, 2003 David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * Lots of stuff stolen from arch/alpha/kernel/smp.c
+ *
+ * 01/05/16 Rohit Seth <rohit.seth@intel.com>  IA64-SMP functions. Reorganized
+ * the existing code (on the lines of x86 port).
+ * 00/09/11 David Mosberger <davidm@hpl.hp.com> Do loops_per_jiffy
+ * calibration on each CPU.
+ * 00/08/23 Asit Mallick <asit.k.mallick@intel.com> fixed logical processor id
+ * 00/03/31 Rohit Seth <rohit.seth@intel.com>	Fixes for Bootstrap Processor
+ * & cpu_online_map now gets done here (instead of setup.c)
+ * 99/10/05 davidm	Update to bring it in sync with new command-line processing
+ *  scheme.
+ * 10/13/00 Goutham Rao <goutham.rao@intel.com> Updated smp_call_function and
+ *		smp_call_function_single to resend IPI on timeouts
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/smp.h>
+#include <linux/kernel_stat.h>
+#include <linux/mm.h>
+#include <linux/cache.h>
+#include <linux/delay.h>
+#include <linux/efi.h>
+#include <linux/bitops.h>
+
+#include <asm/atomic.h>
+#include <asm/current.h>
+#include <asm/delay.h>
+#include <asm/machvec.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/ptrace.h>
+#include <asm/sal.h>
+#include <asm/system.h>
+#include <asm/tlbflush.h>
+#include <asm/unistd.h>
+#include <asm/mca.h>
+
+/*
+ * Structure and data for smp_call_function(). This is designed to minimise static memory
+ * requirements. It also looks cleaner.
+ */
+static  __cacheline_aligned DEFINE_SPINLOCK(call_lock);
+
+struct call_data_struct {
+	void (*func) (void *info);
+	void *info;
+	long wait;
+	atomic_t started;
+	atomic_t finished;
+};
+
+static volatile struct call_data_struct *call_data;
+
+#define IPI_CALL_FUNC		0
+#define IPI_CPU_STOP		1
+
+/* This needs to be cacheline aligned because it is written to by *other* CPUs.  */
+static DEFINE_PER_CPU(u64, ipi_operation) ____cacheline_aligned;
+
+extern void cpu_halt (void);
+
+void
+lock_ipi_calllock(void)
+{
+	spin_lock_irq(&call_lock);
+}
+
+void
+unlock_ipi_calllock(void)
+{
+	spin_unlock_irq(&call_lock);
+}
+
+static void
+stop_this_cpu (void)
+{
+	/*
+	 * Remove this CPU:
+	 */
+	cpu_clear(smp_processor_id(), cpu_online_map);
+	max_xtp();
+	local_irq_disable();
+	cpu_halt();
+}
+
+void
+cpu_die(void)
+{
+	max_xtp();
+	local_irq_disable();
+	cpu_halt();
+	/* Should never be here */
+	BUG();
+	for (;;);
+}
+
+irqreturn_t
+handle_IPI (int irq, void *dev_id, struct pt_regs *regs)
+{
+	int this_cpu = get_cpu();
+	unsigned long *pending_ipis = &__ia64_per_cpu_var(ipi_operation);
+	unsigned long ops;
+
+	mb();	/* Order interrupt and bit testing. */
+	while ((ops = xchg(pending_ipis, 0)) != 0) {
+		mb();	/* Order bit clearing and data access. */
+		do {
+			unsigned long which;
+
+			which = ffz(~ops);
+			ops &= ~(1 << which);
+
+			switch (which) {
+			      case IPI_CALL_FUNC:
+			      {
+				      struct call_data_struct *data;
+				      void (*func)(void *info);
+				      void *info;
+				      int wait;
+
+				      /* release the 'pointer lock' */
+				      data = (struct call_data_struct *) call_data;
+				      func = data->func;
+				      info = data->info;
+				      wait = data->wait;
+
+				      mb();
+				      atomic_inc(&data->started);
+				      /*
+				       * At this point the structure may be gone unless
+				       * wait is true.
+				       */
+				      (*func)(info);
+
+				      /* Notify the sending CPU that the task is done.  */
+				      mb();
+				      if (wait)
+					      atomic_inc(&data->finished);
+			      }
+			      break;
+
+			      case IPI_CPU_STOP:
+				stop_this_cpu();
+				break;
+
+			      default:
+				printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n", this_cpu, which);
+				break;
+			}
+		} while (ops);
+		mb();	/* Order data access and bit testing. */
+	}
+	put_cpu();
+	return IRQ_HANDLED;
+}
+
+/*
+ * Called with preeemption disabled.
+ */
+static inline void
+send_IPI_single (int dest_cpu, int op)
+{
+	set_bit(op, &per_cpu(ipi_operation, dest_cpu));
+	platform_send_ipi(dest_cpu, IA64_IPI_VECTOR, IA64_IPI_DM_INT, 0);
+}
+
+/*
+ * Called with preeemption disabled.
+ */
+static inline void
+send_IPI_allbutself (int op)
+{
+	unsigned int i;
+
+	for (i = 0; i < NR_CPUS; i++) {
+		if (cpu_online(i) && i != smp_processor_id())
+			send_IPI_single(i, op);
+	}
+}
+
+/*
+ * Called with preeemption disabled.
+ */
+static inline void
+send_IPI_all (int op)
+{
+	int i;
+
+	for (i = 0; i < NR_CPUS; i++)
+		if (cpu_online(i))
+			send_IPI_single(i, op);
+}
+
+/*
+ * Called with preeemption disabled.
+ */
+static inline void
+send_IPI_self (int op)
+{
+	send_IPI_single(smp_processor_id(), op);
+}
+
+/*
+ * Called with preeemption disabled.
+ */
+void
+smp_send_reschedule (int cpu)
+{
+	platform_send_ipi(cpu, IA64_IPI_RESCHEDULE, IA64_IPI_DM_INT, 0);
+}
+
+void
+smp_flush_tlb_all (void)
+{
+	on_each_cpu((void (*)(void *))local_flush_tlb_all, NULL, 1, 1);
+}
+
+void
+smp_flush_tlb_mm (struct mm_struct *mm)
+{
+	/* this happens for the common case of a single-threaded fork():  */
+	if (likely(mm == current->active_mm && atomic_read(&mm->mm_users) == 1))
+	{
+		local_finish_flush_tlb_mm(mm);
+		return;
+	}
+
+	/*
+	 * We could optimize this further by using mm->cpu_vm_mask to track which CPUs
+	 * have been running in the address space.  It's not clear that this is worth the
+	 * trouble though: to avoid races, we have to raise the IPI on the target CPU
+	 * anyhow, and once a CPU is interrupted, the cost of local_flush_tlb_all() is
+	 * rather trivial.
+	 */
+	on_each_cpu((void (*)(void *))local_finish_flush_tlb_mm, mm, 1, 1);
+}
+
+/*
+ * Run a function on another CPU
+ *  <func>	The function to run. This must be fast and non-blocking.
+ *  <info>	An arbitrary pointer to pass to the function.
+ *  <nonatomic>	Currently unused.
+ *  <wait>	If true, wait until function has completed on other CPUs.
+ *  [RETURNS]   0 on success, else a negative status code.
+ *
+ * Does not return until the remote CPU is nearly ready to execute <func>
+ * or is or has executed.
+ */
+
+int
+smp_call_function_single (int cpuid, void (*func) (void *info), void *info, int nonatomic,
+			  int wait)
+{
+	struct call_data_struct data;
+	int cpus = 1;
+	int me = get_cpu(); /* prevent preemption and reschedule on another processor */
+
+	if (cpuid == me) {
+		printk("%s: trying to call self\n", __FUNCTION__);
+		put_cpu();
+		return -EBUSY;
+	}
+
+	data.func = func;
+	data.info = info;
+	atomic_set(&data.started, 0);
+	data.wait = wait;
+	if (wait)
+		atomic_set(&data.finished, 0);
+
+	spin_lock_bh(&call_lock);
+
+	call_data = &data;
+	mb();	/* ensure store to call_data precedes setting of IPI_CALL_FUNC */
+  	send_IPI_single(cpuid, IPI_CALL_FUNC);
+
+	/* Wait for response */
+	while (atomic_read(&data.started) != cpus)
+		cpu_relax();
+
+	if (wait)
+		while (atomic_read(&data.finished) != cpus)
+			cpu_relax();
+	call_data = NULL;
+
+	spin_unlock_bh(&call_lock);
+	put_cpu();
+	return 0;
+}
+EXPORT_SYMBOL(smp_call_function_single);
+
+/*
+ * this function sends a 'generic call function' IPI to all other CPUs
+ * in the system.
+ */
+
+/*
+ *  [SUMMARY]	Run a function on all other CPUs.
+ *  <func>	The function to run. This must be fast and non-blocking.
+ *  <info>	An arbitrary pointer to pass to the function.
+ *  <nonatomic>	currently unused.
+ *  <wait>	If true, wait (atomically) until function has completed on other CPUs.
+ *  [RETURNS]   0 on success, else a negative status code.
+ *
+ * Does not return until remote CPUs are nearly ready to execute <func> or are or have
+ * executed.
+ *
+ * You must not call this function with disabled interrupts or from a
+ * hardware interrupt handler or from a bottom half handler.
+ */
+int
+smp_call_function (void (*func) (void *info), void *info, int nonatomic, int wait)
+{
+	struct call_data_struct data;
+	int cpus = num_online_cpus()-1;
+
+	if (!cpus)
+		return 0;
+
+	/* Can deadlock when called with interrupts disabled */
+	WARN_ON(irqs_disabled());
+
+	data.func = func;
+	data.info = info;
+	atomic_set(&data.started, 0);
+	data.wait = wait;
+	if (wait)
+		atomic_set(&data.finished, 0);
+
+	spin_lock(&call_lock);
+
+	call_data = &data;
+	mb();	/* ensure store to call_data precedes setting of IPI_CALL_FUNC */
+	send_IPI_allbutself(IPI_CALL_FUNC);
+
+	/* Wait for response */
+	while (atomic_read(&data.started) != cpus)
+		cpu_relax();
+
+	if (wait)
+		while (atomic_read(&data.finished) != cpus)
+			cpu_relax();
+	call_data = NULL;
+
+	spin_unlock(&call_lock);
+	return 0;
+}
+EXPORT_SYMBOL(smp_call_function);
+
+/*
+ * this function calls the 'stop' function on all other CPUs in the system.
+ */
+void
+smp_send_stop (void)
+{
+	send_IPI_allbutself(IPI_CPU_STOP);
+}
+
+int __init
+setup_profiling_timer (unsigned int multiplier)
+{
+	return -EINVAL;
+}