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drm/msm: Add param for userspace to query suspend count

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Performance counts, and ALWAYS_ON counters used for capturing GPU
timestamps, lose their state across suspend/resume cycles.  Userspace
tooling for performance monitoring needs to be aware of this.  For
example, after a suspend userspace needs to recalibrate it's offset
between CPU and GPU time.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Acked-by: Jordan Crouse <jordan@cosmicpenguin.net>
Link: https://lore.kernel.org/r/20210325012358.1759770-3-robdclark@gmail.com
Signed-off-by: Rob Clark <robdclark@chromium.org>
This commit is contained in:
Rob Clark
2021-04-07 11:05:43 -07:00
parent f5b1a87843
commit 3ab1c5cc39
5 changed files with 9 additions and 0 deletions
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include/uapi/drm/msm_drm.h
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@@ -76,6 +76,7 @@ struct drm_msm_timespec {
#define MSM_PARAM_NR_RINGS 0x07
#define MSM_PARAM_PP_PGTABLE 0x08 /* => 1 for per-process pagetables, else 0 */
#define MSM_PARAM_FAULTS 0x09
#define MSM_PARAM_SUSPENDS 0x0a
struct drm_msm_param {
__u32 pipe; /* in, MSM_PIPE_x */