diff options
| -rw-r--r-- | arch/powerpc/kernel/perf_counter.c | 22 | ||||
| -rw-r--r-- | kernel/perf_counter.c | 4 |
2 files changed, 24 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/perf_counter.c b/arch/powerpc/kernel/perf_counter.c index df3fe057dee9..85ad25923c2c 100644 --- a/arch/powerpc/kernel/perf_counter.c +++ b/arch/powerpc/kernel/perf_counter.c @@ -15,6 +15,7 @@ #include <linux/hardirq.h> #include <asm/reg.h> #include <asm/pmc.h> +#include <asm/machdep.h> struct cpu_hw_counters { int n_counters; @@ -24,6 +25,7 @@ struct cpu_hw_counters { struct perf_counter *counter[MAX_HWCOUNTERS]; unsigned int events[MAX_HWCOUNTERS]; u64 mmcr[3]; + u8 pmcs_enabled; }; DEFINE_PER_CPU(struct cpu_hw_counters, cpu_hw_counters); @@ -262,6 +264,15 @@ u64 hw_perf_save_disable(void) cpuhw->n_added = 0; /* + * Check if we ever enabled the PMU on this cpu. + */ + if (!cpuhw->pmcs_enabled) { + if (ppc_md.enable_pmcs) + ppc_md.enable_pmcs(); + cpuhw->pmcs_enabled = 1; + } + + /* * Set the 'freeze counters' bit. * The barrier is to make sure the mtspr has been * executed and the PMU has frozen the counters @@ -305,6 +316,8 @@ void hw_perf_restore(u64 disable) mtspr(SPRN_MMCRA, cpuhw->mmcr[2]); mtspr(SPRN_MMCR1, cpuhw->mmcr[1]); mtspr(SPRN_MMCR0, cpuhw->mmcr[0]); + if (cpuhw->n_counters == 0) + get_lppaca()->pmcregs_in_use = 0; goto out; } @@ -323,6 +336,7 @@ void hw_perf_restore(u64 disable) * bit set and set the hardware counters to their initial values. * Then unfreeze the counters. */ + get_lppaca()->pmcregs_in_use = 1; mtspr(SPRN_MMCRA, cpuhw->mmcr[2]); mtspr(SPRN_MMCR1, cpuhw->mmcr[1]); mtspr(SPRN_MMCR0, (cpuhw->mmcr[0] & ~(MMCR0_PMC1CE | MMCR0_PMCjCE)) @@ -741,6 +755,14 @@ static void perf_counter_interrupt(struct pt_regs *regs) } } +void hw_perf_counter_setup(int cpu) +{ + struct cpu_hw_counters *cpuhw = &per_cpu(cpu_hw_counters, cpu); + + memset(cpuhw, 0, sizeof(*cpuhw)); + cpuhw->mmcr[0] = MMCR0_FC; +} + extern struct power_pmu ppc970_pmu; extern struct power_pmu power6_pmu; diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index 3aef3062ff78..52f2f526248e 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -46,7 +46,7 @@ hw_perf_counter_init(struct perf_counter *counter) u64 __weak hw_perf_save_disable(void) { return 0; } void __weak hw_perf_restore(u64 ctrl) { barrier(); } -void __weak hw_perf_counter_setup(void) { barrier(); } +void __weak hw_perf_counter_setup(int cpu) { barrier(); } int __weak hw_perf_group_sched_in(struct perf_counter *group_leader, struct perf_cpu_context *cpuctx, struct perf_counter_context *ctx, int cpu) @@ -1598,7 +1598,7 @@ static void __cpuinit perf_counter_init_cpu(int cpu) cpuctx->max_pertask = perf_max_counters - perf_reserved_percpu; mutex_unlock(&perf_resource_mutex); - hw_perf_counter_setup(); + hw_perf_counter_setup(cpu); } #ifdef CONFIG_HOTPLUG_CPU |