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author | Yogesh Tillu <yogesh.tillu@linaro.org> | 2015-08-10 14:56:58 +0530 |
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committer | Gary S. Robertson <gary.robertson@linaro.org> | 2015-09-09 16:32:08 -0500 |
commit | 6f7cc80865bae836c963fe4d405fe27496024f6f (patch) | |
tree | 8a18d8b61639aff1c347e3acf971367e01af908b | |
parent | 9877f07f565630a9d4a2ccef14a4e0a932db4dd6 (diff) |
ARM64: perf: override arch_perf_userspace_access()
Override implementation of arch_perf_userspace_access() to enable
or disable access to "perf hw counter" from userspace for mmap
Signed-off-by: Yogesh Tillu <yogesh.tillu@linaro.org>
Signed-off-by: Gary S. Robertson <gary.robertson@linaro.org>
-rw-r--r-- | arch/arm64/kernel/perf_event.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c index 7c7dfe48d0f2..50412ad42d37 100644 --- a/arch/arm64/kernel/perf_event.c +++ b/arch/arm64/kernel/perf_event.c @@ -1394,6 +1394,12 @@ void arch_perf_update_userpage(struct perf_event_mmap_page *userpg, u64 now) userpg->cap_user_rdpmc = cpu_pmu->attr_rdpmc; } +void arch_perf_uspace_access(void *enable) +{ + cpu_pmu->attr_rdpmc = *(int *)enable; + asm volatile("msr pmuserenr_el0, %0" : : "r" (!!*(int *)enable)); +} + static void __init cpu_pmu_init(struct arm_pmu *armpmu) { int cpu; |