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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 2021-03-24 18:23:53 -07:00
parent f5b1a87843
commit 3ab1c5cc39
5 changed files with 9 additions and 0 deletions
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3
drivers/gpu/drm/msm/adreno/adreno_gpu.c
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@ -273,6 +273,9 @@ int adreno_get_param(struct msm_gpu *gpu, uint32_t param, uint64_t *value)
case MSM_PARAM_FAULTS:
*value = gpu->global_faults;
return 0;
case MSM_PARAM_SUSPENDS:
*value = gpu->suspend_count;
return 0;
default:
DBG("%s: invalid param: %u", gpu->name, param);
return -EINVAL;

1
drivers/gpu/drm/msm/msm_drv.c
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@ -39,6 +39,7 @@
* GEM object's debug name
* - 1.5.0 - Add SUBMITQUERY_QUERY ioctl
* - 1.6.0 - Syncobj support
* - 1.7.0 - Add MSM_PARAM_SUSPENDS to access suspend count
*/
#define MSM_VERSION_MAJOR 1
#define MSM_VERSION_MINOR 6

2
drivers/gpu/drm/msm/msm_gpu.c
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@ -251,6 +251,8 @@ int msm_gpu_pm_suspend(struct msm_gpu *gpu)
if (ret)
return ret;
gpu->suspend_count++;
return 0;
}

2
drivers/gpu/drm/msm/msm_gpu.h
View File

@ -152,6 +152,8 @@ struct msm_gpu {
ktime_t time;
} devfreq;
uint32_t suspend_count;
struct msm_gpu_state *crashstate;
/* True if the hardware supports expanded apriv (a650 and newer) */
bool hw_apriv;

1
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 */