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Commit bd02d654 authored by Sheetal Sahasrabudhe's avatar Sheetal Sahasrabudhe Committed by Matt Wagantall
Browse files

Perf: arm64: Update PMU force reset 



Bring all cores online before doing a force reset for PMU.
This is required in order to handle corner case related to
freeing of IRQs for offline cores.

Change-Id: I091d9039e6554099ff4dd80d4a69cabe8eff3138
Signed-off-by: default avatarSheetal Sahasrabudhe <sheetals@codeaurora.org>
parent 4e73e499

arch/arm64/kernel/perf_debug.c

+1 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ static char *descriptions = 
	" 1 Perf: arm64: Add L1 counters to tracepoints\n"

	" 5 Perf: arm64: add perf user-mode permissions\n"

	" 6 Perf: arm64: Add debugfs node to clear PMU\n"

	" 7 Perf: arm64: Update PMU force reset\n"

;



static ssize_t desc_read(struct file *fp, char __user *buf,

arch/arm64/kernel/perf_event.c

+21 −1
Original line number Diff line number Diff line
@@ -1581,12 +1581,32 @@ unsigned long perf_misc_flags(struct pt_regs *regs) 
}



#ifdef CONFIG_PERF_EVENTS_RESET_PMU_DEBUGFS

static void reset_pmu_force(void)

static __ref void reset_pmu_force(void)

{

	int cpu, ret;

	u32 save_online_mask = 0;



	for_each_possible_cpu(cpu) {

		if (!cpu_online(cpu)) {

			save_online_mask |= BIT(cpu);

			ret = cpu_up(cpu);

			if (ret)

				pr_err("Failed to bring up CPU: %d, ret: %d\n",

				       cpu, ret);

		}

	}

	if (cpu_pmu && cpu_pmu->reset)

		on_each_cpu(cpu_pmu->reset, NULL, 1);

	if (cpu_pmu && cpu_pmu->plat_device)

		armpmu_release_hardware(cpu_pmu);

	for_each_possible_cpu(cpu) {

		if ((save_online_mask & BIT(cpu)) && cpu_online(cpu)) {

			ret = cpu_down(cpu);

			if (ret)

				pr_err("Failed to bring down CPU: %d, ret: %d\n",

						cpu, ret);

		}

	}

}



static int write_enabled_perfpmu_action(void *data, u64 val)