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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2005-11-08 19:08:05 (GMT) |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-11-08 19:08:05 (GMT) |
| commit | 37ee16ae93a3e4ae7dd51beb81d249f5f12a55c2 (patch) | |
| tree | a6cf9773ddb5eae9f173c6a9c9d6120faa5688a4 /arch/arm/kernel | |
| parent | 3b6353fae0d7ba772d7eb2651727332c9e9c74ac (diff) | |
| download | linux-37ee16ae93a3e4ae7dd51beb81d249f5f12a55c2.tar.xz | |
[ARM SMP] Add core ARM support for local timers
Add infrastructure for supporting per-cpu local timers to update
the profiling information and update system time accounting.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/entry-armv.S | 7 | ||||
| -rw-r--r-- | arch/arm/kernel/irq.c | 1 | ||||
| -rw-r--r-- | arch/arm/kernel/smp.c | 34 |
3 files changed, 42 insertions, 0 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index a511ec5..d9fb819 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -47,6 +47,13 @@ movne r0, sp adrne lr, 1b bne do_IPI + +#ifdef CONFIG_LOCAL_TIMERS + test_for_ltirq r0, r6, r5, lr + movne r0, sp + adrne lr, 1b + bne do_local_timer +#endif #endif .endm diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c index 6f86d0a..d7099db 100644 --- a/arch/arm/kernel/irq.c +++ b/arch/arm/kernel/irq.c @@ -264,6 +264,7 @@ unlock: #endif #ifdef CONFIG_SMP show_ipi_list(p); + show_local_irqs(p); #endif seq_printf(p, "Err: %10lu\n", irq_err_count); } diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index f5fc57e..77e2e9c 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -185,6 +185,11 @@ int __cpuexit __cpu_disable(void) migrate_irqs(); /* + * Stop the local timer for this CPU. + */ + local_timer_stop(cpu); + + /* * Flush user cache and TLB mappings, and then remove this CPU * from the vm mask set of all processes. */ @@ -290,6 +295,11 @@ asmlinkage void __cpuinit secondary_start_kernel(void) cpu_set(cpu, cpu_online_map); /* + * Setup local timer for this CPU. + */ + local_timer_setup(cpu); + + /* * OK, it's off to the idle thread for us */ cpu_idle(); @@ -454,6 +464,18 @@ void show_ipi_list(struct seq_file *p) seq_putc(p, '\n'); } +void show_local_irqs(struct seq_file *p) +{ + unsigned int cpu; + + seq_printf(p, "LOC: "); + + for_each_present_cpu(cpu) + seq_printf(p, "%10u ", irq_stat[cpu].local_timer_irqs); + + seq_putc(p, '\n'); +} + static void ipi_timer(struct pt_regs *regs) { int user = user_mode(regs); @@ -464,6 +486,18 @@ static void ipi_timer(struct pt_regs *regs) irq_exit(); } +#ifdef CONFIG_LOCAL_TIMERS +asmlinkage void do_local_timer(struct pt_regs *regs) +{ + int cpu = smp_processor_id(); + + if (local_timer_ack()) { + irq_stat[cpu].local_timer_irqs++; + ipi_timer(regs); + } +} +#endif + /* * ipi_call_function - handle IPI from smp_call_function() * |