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author | Yogesh Tillu <yogesh.tillu@linaro.org> | 2015-08-10 11:56:25 +0530 |
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committer | Yogesh Tillu <yogesh.tillu@linaro.org> | 2015-09-11 17:34:25 +0530 |
commit | 37b6b5e3500d6f5773028a9de09906bd38d77101 (patch) | |
tree | 3e57291ce035c1c3702f9bcbe42894401a27938d | |
parent | bf75813090e63bc8f20cc9ac00f7db71a1bdd999 (diff) |
ARM64: perf: override arch_perf_userspace_access()perf_mmap_working_v4.2
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>
-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 b3aa2bf27d77..8c223d0d1593 100644 --- a/arch/arm64/kernel/perf_event.c +++ b/arch/arm64/kernel/perf_event.c @@ -1396,6 +1396,12 @@ 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; |