From 90f45c42d7d7b0ec0fd797485c07fc421c474e12 Mon Sep 17 00:00:00 2001 From: Rob Clark Date: Thu, 3 Mar 2022 16:52:16 -0800 Subject: drm/msm: Add SYSPROF param (v2) Add a SYSPROF param for system profiling tools like Mesa's pps-producer (perfetto) to control behavior related to system-wide performance counter collection. In particular, for profiling, one wants to ensure that GPU context switches do not effect perfcounter state, and might want to suppress suspend (which would cause counters to lose state). v2: Swap the order in msm_file_private_set_sysprof() [sboyd] and initialize the sysprof_active refcount to one (because the under/ overflow checking in refcount_t doesn't expect a 0->1 transition) meaning that values greater than 1 means sysprof is active. Signed-off-by: Rob Clark Link: https://lore.kernel.org/r/20220304005317.776110-4-robdclark@gmail.com --- drivers/gpu/drm/msm/msm_submitqueue.c | 39 +++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) (limited to 'drivers/gpu/drm/msm/msm_submitqueue.c') diff --git a/drivers/gpu/drm/msm/msm_submitqueue.c b/drivers/gpu/drm/msm/msm_submitqueue.c index 7cb158bcbcf6..79b6ccd6ce64 100644 --- a/drivers/gpu/drm/msm/msm_submitqueue.c +++ b/drivers/gpu/drm/msm/msm_submitqueue.c @@ -7,6 +7,45 @@ #include "msm_gpu.h" +int msm_file_private_set_sysprof(struct msm_file_private *ctx, + struct msm_gpu *gpu, int sysprof) +{ + /* + * Since pm_runtime and sysprof_active are both refcounts, we + * call apply the new value first, and then unwind the previous + * value + */ + + switch (sysprof) { + default: + return -EINVAL; + case 2: + pm_runtime_get_sync(&gpu->pdev->dev); + fallthrough; + case 1: + refcount_inc(&gpu->sysprof_active); + fallthrough; + case 0: + break; + } + + /* unwind old value: */ + switch (ctx->sysprof) { + case 2: + pm_runtime_put_autosuspend(&gpu->pdev->dev); + fallthrough; + case 1: + refcount_dec(&gpu->sysprof_active); + fallthrough; + case 0: + break; + } + + ctx->sysprof = sysprof; + + return 0; +} + void __msm_file_private_destroy(struct kref *kref) { struct msm_file_private *ctx = container_of(kref, -- cgit v1.2.3-70-g09d2