diff options
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 13:37:05 -0500 |
commit | e7c84b65906149f2250ab51f44632ec17eba6729 (patch) | |
tree | bf9114c631390d27e05b3d417d95c9b93a97715d | |
parent | 73ce60fe6d7ccf65379c4d121e76a3ad825100b1 (diff) |
ARM64: perf: override arch_perf_userspace_access()linux-lng-preempt-rt-3.18.16-2015.10linux-lng-preempt-rt-3.18.16-2015.09linux-linaro-lng-v3.18-rt-testlinux-linaro-lng-v3.18-rt
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 b84c9366e332..00daf51a0c04 100644 --- a/arch/arm64/kernel/perf_event.c +++ b/arch/arm64/kernel/perf_event.c @@ -1325,6 +1325,12 @@ 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; |