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drm/msm: Add debugfs to trigger shrinker

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Just for the purposes of testing.  Write to it the # of objects to scan,
read back the # freed.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Link: https://lore.kernel.org/r/20210614150618.729610-1-robdclark@gmail.com
Signed-off-by: Rob Clark <robdclark@chromium.org>
This commit is contained in:
Rob Clark 2021-06-14 08:06:18 -07:00
parent c96348a8fb
commit 5434941fd4
3 changed files with 50 additions and 0 deletions
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28
drivers/gpu/drm/msm/msm_debugfs.c
View File

@ -108,6 +108,31 @@ static const struct file_operations msm_gpu_fops = {
.release = msm_gpu_release,
};
static unsigned long last_shrink_freed;
static int
shrink_get(void *data, u64 *val)
{
*val = last_shrink_freed;
return 0;
}
static int
shrink_set(void *data, u64 val)
{
struct drm_device *dev = data;
last_shrink_freed = msm_gem_shrinker_shrink(dev, val);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(shrink_fops,
shrink_get, shrink_set,
"0x%08llx\n");
static int msm_gem_show(struct drm_device *dev, struct seq_file *m)
{
struct msm_drm_private *priv = dev->dev_private;
@ -229,6 +254,9 @@ void msm_debugfs_init(struct drm_minor *minor)
debugfs_create_u32("hangcheck_period_ms", 0600, minor->debugfs_root,
&priv->hangcheck_period);
debugfs_create_file("shrink", S_IRWXU, minor->debugfs_root,
dev, &shrink_fops);
if (priv->kms && priv->kms->funcs->debugfs_init)
priv->kms->funcs->debugfs_init(priv->kms, minor);
}

4
drivers/gpu/drm/msm/msm_drv.h
View File

@ -299,6 +299,10 @@ bool msm_use_mmu(struct drm_device *dev);
int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
struct drm_file *file);
#ifdef CONFIG_DEBUG_FS
unsigned long msm_gem_shrinker_shrink(struct drm_device *dev, unsigned long nr_to_scan);
#endif
void msm_gem_shrinker_init(struct drm_device *dev);
void msm_gem_shrinker_cleanup(struct drm_device *dev);

18
drivers/gpu/drm/msm/msm_gem_shrinker.c
View File

@ -145,6 +145,24 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
return (freed > 0) ? freed : SHRINK_STOP;
}
#ifdef CONFIG_DEBUG_FS
unsigned long
msm_gem_shrinker_shrink(struct drm_device *dev, unsigned long nr_to_scan)
{
struct msm_drm_private *priv = dev->dev_private;
struct shrink_control sc = {
.nr_to_scan = nr_to_scan,
};
int ret;
fs_reclaim_acquire(GFP_KERNEL);
ret = msm_gem_shrinker_scan(&priv->shrinker, &sc);
fs_reclaim_release(GFP_KERNEL);
return ret;
}
#endif
/* since we don't know any better, lets bail after a few
* and if necessary the shrinker will be invoked again.
* Seems better than unmapping *everything*