This is a note to let you know that I've just added the patch titled
drm/msm/gpu: Add devfreq tuning debugfs
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-msm-gpu-add-devfreq-tuning-debugfs.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7b070f07aaf7dcbacaae9a86fdbb3a1fc8a0d4a3
Author: Rob Clark <robdclark@xxxxxxxxxxxx>
Date: Tue Jan 10 15:14:42 2023 -0800
drm/msm/gpu: Add devfreq tuning debugfs
[ Upstream commit 6563f60f14cbb3dcbdc4e1d8469fc0fbaaa80544 ]
Make the handful of tuning knobs available visible via debugfs.
v2: select DEVFREQ_GOV_SIMPLE_ONDEMAND because for some reason
struct devfreq_simple_ondemand_data depends on this
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Patchwork: https://patchwork.freedesktop.org/patch/517784/
Link: https://lore.kernel.org/r/20230110231447.1939101-2-robdclark@xxxxxxxxx
Reviewed-by: Chia-I Wu <olvaffe@xxxxxxxxx>
Stable-dep-of: 8f32ddd87e49 ("drm/msm/gpu: Check the status of registration to PM QoS")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/msm/Kconfig b/drivers/gpu/drm/msm/Kconfig
index 3c9dfdb0b3283..f7abacb4b221b 100644
--- a/drivers/gpu/drm/msm/Kconfig
+++ b/drivers/gpu/drm/msm/Kconfig
@@ -23,6 +23,7 @@ config DRM_MSM
select SHMEM
select TMPFS
select QCOM_SCM
+ select DEVFREQ_GOV_SIMPLE_ONDEMAND
select WANT_DEV_COREDUMP
select SND_SOC_HDMI_CODEC if SND_SOC
select SYNC_FILE
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index d6a810b7cfa2c..cdb4665b953c8 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -2056,7 +2056,7 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
* to cause power supply issues:
*/
if (adreno_is_a618(adreno_gpu) || adreno_is_7c3(adreno_gpu))
- gpu->clamp_to_idle = true;
+ priv->gpu_clamp_to_idle = true;
/* Check if there is a GMU phandle and set it up */
node = of_parse_phandle(pdev->dev.of_node, "qcom,gmu", 0);
diff --git a/drivers/gpu/drm/msm/msm_debugfs.c b/drivers/gpu/drm/msm/msm_debugfs.c
index 95f4374ae21c2..d6ecff0ab6187 100644
--- a/drivers/gpu/drm/msm/msm_debugfs.c
+++ b/drivers/gpu/drm/msm/msm_debugfs.c
@@ -305,6 +305,7 @@ void msm_debugfs_init(struct drm_minor *minor)
{
struct drm_device *dev = minor->dev;
struct msm_drm_private *priv = dev->dev_private;
+ struct dentry *gpu_devfreq;
drm_debugfs_create_files(msm_debugfs_list,
ARRAY_SIZE(msm_debugfs_list),
@@ -325,6 +326,17 @@ void msm_debugfs_init(struct drm_minor *minor)
debugfs_create_file("shrink", S_IRWXU, minor->debugfs_root,
dev, &shrink_fops);
+ gpu_devfreq = debugfs_create_dir("devfreq", minor->debugfs_root);
+
+ debugfs_create_bool("idle_clamp",0600, gpu_devfreq,
+ &priv->gpu_clamp_to_idle);
+
+ debugfs_create_u32("upthreshold",0600, gpu_devfreq,
+ &priv->gpu_devfreq_config.upthreshold);
+
+ debugfs_create_u32("downdifferential",0600, gpu_devfreq,
+ &priv->gpu_devfreq_config.downdifferential);
+
if (priv->kms && priv->kms->funcs->debugfs_init)
priv->kms->funcs->debugfs_init(priv->kms, minor);
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index d4e0ef608950e..81deb112ea446 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -11,6 +11,7 @@
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/cpufreq.h>
+#include <linux/devfreq.h>
#include <linux/module.h>
#include <linux/component.h>
#include <linux/platform_device.h>
@@ -233,6 +234,14 @@ struct msm_drm_private {
*/
unsigned int hangcheck_period;
+ /** gpu_devfreq_config: Devfreq tuning config for the GPU. */
+ struct devfreq_simple_ondemand_data gpu_devfreq_config;
+
+ /**
+ * gpu_clamp_to_idle: Enable clamping to idle freq when inactive
+ */
+ bool gpu_clamp_to_idle;
+
/**
* disable_err_irq:
*
diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
index b39cd332751dc..a326b6d1adbe2 100644
--- a/drivers/gpu/drm/msm/msm_gpu.h
+++ b/drivers/gpu/drm/msm/msm_gpu.h
@@ -275,9 +275,6 @@ struct msm_gpu {
struct msm_gpu_state *crashstate;
- /* Enable clamping to idle freq when inactive: */
- bool clamp_to_idle;
-
/* True if the hardware supports expanded apriv (a650 and newer) */
bool hw_apriv;
diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
index 85c443a37e4e8..1f4e2dd8e76dd 100644
--- a/drivers/gpu/drm/msm/msm_gpu_devfreq.c
+++ b/drivers/gpu/drm/msm/msm_gpu_devfreq.c
@@ -183,6 +183,7 @@ static bool has_devfreq(struct msm_gpu *gpu)
void msm_devfreq_init(struct msm_gpu *gpu)
{
struct msm_gpu_devfreq *df = &gpu->devfreq;
+ struct msm_drm_private *priv = gpu->dev->dev_private;
/* We need target support to do devfreq */
if (!gpu->funcs->gpu_busy)
@@ -209,7 +210,7 @@ void msm_devfreq_init(struct msm_gpu *gpu)
df->devfreq = devm_devfreq_add_device(&gpu->pdev->dev,
&msm_devfreq_profile, DEVFREQ_GOV_SIMPLE_ONDEMAND,
- NULL);
+ &priv->gpu_devfreq_config);
if (IS_ERR(df->devfreq)) {
DRM_DEV_ERROR(&gpu->pdev->dev, "Couldn't initialize GPU devfreq\n");
@@ -358,10 +359,11 @@ static void msm_devfreq_idle_work(struct kthread_work *work)
struct msm_gpu_devfreq *df = container_of(work,
struct msm_gpu_devfreq, idle_work.work);
struct msm_gpu *gpu = container_of(df, struct msm_gpu, devfreq);
+ struct msm_drm_private *priv = gpu->dev->dev_private;
df->idle_time = ktime_get();
- if (gpu->clamp_to_idle)
+ if (priv->gpu_clamp_to_idle)
dev_pm_qos_update_request(&df->idle_freq, 0);
}
