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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 13:18:18 -0500 |
commit | fc6c8563fb89aaaab437f8215894219e54dfc5df (patch) | |
tree | aaa003e0f4db2ff5db4e71c945a50e5351e4eff5 | |
parent | 2fa62468ee0a97588257af4ef0e5aa7670d86807 (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 03467812f667..0047241ece9c 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; |