drm/radeon: track memory statistics about VRAM and GTT usage and buffer moves v2

The statistics are:
- VRAM usage in bytes
- GTT usage in bytes
- number of bytes moved by TTM

The last one is actually a counter, so you need to sample it before and after
command submission and take the difference.

This is useful for finding performance bottlenecks. Userspace queries are
also added.

v2: use atomic64_t

Signed-off-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/uapi/drm/radeon_drm.h b/include/uapi/drm/radeon_drm.h
index cb5c93a4c266..aefa2f6afa3b 100644
--- a/include/uapi/drm/radeon_drm.h
+++ b/include/uapi/drm/radeon_drm.h
@@ -1004,6 +1004,9 @@ struct drm_radeon_cs {
 #define RADEON_INFO_VCE_FW_VERSION      0x1b
 /* version of VCE feedback */
 #define RADEON_INFO_VCE_FB_VERSION      0x1c
+#define RADEON_INFO_NUM_BYTES_MOVED     0x1d
+#define RADEON_INFO_VRAM_USAGE          0x1e
+#define RADEON_INFO_GTT_USAGE           0x1f
 
 
 struct drm_radeon_info {