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Commit d42a3dae authored by Neil Leeder's avatar Neil Leeder
Browse files

Perf: arm64: restore registers after reset 



Reset will overwrite registers written by
restore_pm_registers, so order the calls correctly.

Change-Id: I8210d61c2f4c2397efb2de801d94ed1d5aad480c
Signed-off-by: default avatarNeil Leeder <nleeder@codeaurora.org>
parent fd64280e

arch/arm64/kernel/perf_debug.c

+1 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ static char *descriptions = 
	"10 Perf: arm64: tracectr: initialize counts after hotplug\n"

	"11 Perf: arm64: Refine disable/enable in tracecounters\n"

	"12 Perf: arm64: fix disable of pmu irq during hotplug\n"

	"13 Perf: arm64: restore registers after reset\n"

;



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

arch/arm64/kernel/perf_event.c

+3 −2
Original line number Diff line number Diff line
@@ -1556,15 +1556,16 @@ static int perf_cpu_pm_notifier(struct notifier_block *self, unsigned long cmd, 


	case CPU_PM_ENTER_FAILED:

	case CPU_PM_EXIT:

		if (cpu_has_active_perf(cpu) && cpu_pmu->reset)

			cpu_pmu->reset(NULL);

		if (cpu_pmu->restore_pm_registers)

			cpu_pmu->restore_pm_registers((void *)lcpu);

		if (cpu_has_active_perf(cpu) && cpu_pmu->reset) {

		if (cpu_has_active_perf(cpu)) {

			/*

			 * Flip this bit so armpmu_enable knows it needs

			 * to re-enable active counters.

			 */

			__get_cpu_var(from_idle) = 1;

			cpu_pmu->reset(NULL);

			pmu = &cpu_pmu->pmu;

			pmu->pmu_enable(pmu);

		}