From: Lionel Landwerlin Date: Mon, 18 Sep 2017 12:42:41 +0100 Subject: uapi/drm/i915: document field usage of drm_i915_perf_oa_config Git-commit: ee427e259567bc9ba817ddfa5abaf7033f5603e9 Patch-mainline: v4.15-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 Document the expected length of buffers config pointers (tuple of u32 values). Signed-off-by: Lionel Landwerlin Reviewed-by: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20170918114241.30105-1-lionel.g.landwerlin@intel.com Acked-by: Petr Tesarik --- include/uapi/drm/i915_drm.h | 5 +++++ 1 file changed, 5 insertions(+) --- a/include/uapi/drm/i915_drm.h +++ b/include/uapi/drm/i915_drm.h @@ -1512,6 +1512,11 @@ struct drm_i915_perf_oa_config { __u32 n_boolean_regs; __u32 n_flex_regs; + /* + * These fields are pointers to tuples of u32 values (register + * address, value). For example the expected length of the buffer + * pointed by mux_regs_ptr is (2 * sizeof(u32) * n_mux_regs). + */ __u64 mux_regs_ptr; __u64 boolean_regs_ptr; __u64 flex_regs_ptr;