On Wed, Mar 24, 2021 at 06:23:53PM -0700, Rob Clark wrote:
> From: Rob Clark <robdcl...@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.
>
Acked-by: Jordan Crouse <jor...@cosmicpenguin.net>
> Signed-off-by: Rob Clark <robdcl...@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 */
> --
> 2.29.2
>
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