From: Rob Clark robdclark@chromium.org
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 --- drivers/gpu/drm/msm/adreno/adreno_gpu.c | 3 +++ drivers/gpu/drm/msm/msm_drv.c | 1 + drivers/gpu/drm/msm/msm_gpu.c | 2 ++ drivers/gpu/drm/msm/msm_gpu.h | 2 ++ include/uapi/drm/msm_drm.h | 1 + 5 files changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c index f09175698827..e473b7c9ff7f 100644 --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c @@ -280,6 +280,9 @@ 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; diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index b29e439eb299..4f9fa0189a07 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -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 diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c index 7bdb01f202f4..ab888d83b887 100644 --- a/drivers/gpu/drm/msm/msm_gpu.c +++ b/drivers/gpu/drm/msm/msm_gpu.c @@ -256,6 +256,8 @@ int msm_gpu_pm_suspend(struct msm_gpu *gpu) if (ret) return ret;
+ gpu->suspend_count++; + return 0; }
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h index d7cd02cd2109..18baf935e143 100644 --- a/drivers/gpu/drm/msm/msm_gpu.h +++ b/drivers/gpu/drm/msm/msm_gpu.h @@ -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; diff --git a/include/uapi/drm/msm_drm.h b/include/uapi/drm/msm_drm.h index a6c1f3eb2623..5596d7c37f9e 100644 --- a/include/uapi/drm/msm_drm.h +++ b/include/uapi/drm/msm_drm.h @@ -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 */