Document the expected length register config pointers (tuple of u32
values).

Signed-off-by: Lionel Landwerlin <[email protected]>
---
 include/uapi/drm/i915_drm.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index fd5c103fe88d..20062f30c1b1 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1523,6 +1523,11 @@ 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 should be (2 * sizeof(u32) * n_mux_regs).
+        */
        __u64 mux_regs_ptr;
        __u64 boolean_regs_ptr;
        __u64 flex_regs_ptr;
-- 
2.14.1

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