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Date: Mon, 7 Aug 2023 19:09:13 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
To: akpm@...ux-foundation.org, david@...morbit.com, tkhai@...ru,
vbabka@...e.cz, roman.gushchin@...ux.dev, djwong@...nel.org,
brauner@...nel.org, paulmck@...nel.org, tytso@....edu,
steven.price@....com, cel@...nel.org, senozhatsky@...omium.org,
yujie.liu@...el.com, gregkh@...uxfoundation.org,
muchun.song@...ux.dev, simon.horman@...igine.com,
dlemoal@...nel.org
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
kvm@...r.kernel.org, xen-devel@...ts.xenproject.org,
linux-erofs@...ts.ozlabs.org,
linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
linux-nfs@...r.kernel.org, linux-mtd@...ts.infradead.org,
rcu@...r.kernel.org, netdev@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
dm-devel@...hat.com, linux-raid@...r.kernel.org,
linux-bcache@...r.kernel.org,
virtualization@...ts.linux-foundation.org,
linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
linux-xfs@...r.kernel.org, linux-btrfs@...r.kernel.org,
Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH v4 25/48] drm/panfrost: dynamically allocate the drm-panfrost shrinker
In preparation for implementing lockless slab shrink, use new APIs to
dynamically allocate the drm-panfrost shrinker, so that it can be freed
asynchronously using kfree_rcu(). Then it doesn't need to wait for RCU
read-side critical section when releasing the struct panfrost_device.
Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
Reviewed-by: Steven Price <steven.price@....com>
---
drivers/gpu/drm/panfrost/panfrost_device.h | 2 +-
drivers/gpu/drm/panfrost/panfrost_drv.c | 6 +++-
drivers/gpu/drm/panfrost/panfrost_gem.h | 2 +-
.../gpu/drm/panfrost/panfrost_gem_shrinker.c | 30 +++++++++++--------
4 files changed, 25 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index b0126b9fbadc..e667e5689353 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -118,7 +118,7 @@ struct panfrost_device {
struct mutex shrinker_lock;
struct list_head shrinker_list;
- struct shrinker shrinker;
+ struct shrinker *shrinker;
struct panfrost_devfreq pfdevfreq;
};
diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index a2ab99698ca8..e1d0e3a23757 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -601,10 +601,14 @@ static int panfrost_probe(struct platform_device *pdev)
if (err < 0)
goto err_out1;
- panfrost_gem_shrinker_init(ddev);
+ err = panfrost_gem_shrinker_init(ddev);
+ if (err)
+ goto err_out2;
return 0;
+err_out2:
+ drm_dev_unregister(ddev);
err_out1:
pm_runtime_disable(pfdev->dev);
panfrost_device_fini(pfdev);
diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.h b/drivers/gpu/drm/panfrost/panfrost_gem.h
index ad2877eeeccd..863d2ec8d4f0 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gem.h
+++ b/drivers/gpu/drm/panfrost/panfrost_gem.h
@@ -81,7 +81,7 @@ panfrost_gem_mapping_get(struct panfrost_gem_object *bo,
void panfrost_gem_mapping_put(struct panfrost_gem_mapping *mapping);
void panfrost_gem_teardown_mappings_locked(struct panfrost_gem_object *bo);
-void panfrost_gem_shrinker_init(struct drm_device *dev);
+int panfrost_gem_shrinker_init(struct drm_device *dev);
void panfrost_gem_shrinker_cleanup(struct drm_device *dev);
#endif /* __PANFROST_GEM_H__ */
diff --git a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
index 6a71a2555f85..3dfe2b7ccdd9 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gem_shrinker.c
@@ -18,8 +18,7 @@
static unsigned long
panfrost_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc)
{
- struct panfrost_device *pfdev =
- container_of(shrinker, struct panfrost_device, shrinker);
+ struct panfrost_device *pfdev = shrinker->private_data;
struct drm_gem_shmem_object *shmem;
unsigned long count = 0;
@@ -65,8 +64,7 @@ static bool panfrost_gem_purge(struct drm_gem_object *obj)
static unsigned long
panfrost_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
{
- struct panfrost_device *pfdev =
- container_of(shrinker, struct panfrost_device, shrinker);
+ struct panfrost_device *pfdev = shrinker->private_data;
struct drm_gem_shmem_object *shmem, *tmp;
unsigned long freed = 0;
@@ -97,13 +95,22 @@ panfrost_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
*
* This function registers and sets up the panfrost shrinker.
*/
-void panfrost_gem_shrinker_init(struct drm_device *dev)
+int panfrost_gem_shrinker_init(struct drm_device *dev)
{
struct panfrost_device *pfdev = dev->dev_private;
- pfdev->shrinker.count_objects = panfrost_gem_shrinker_count;
- pfdev->shrinker.scan_objects = panfrost_gem_shrinker_scan;
- pfdev->shrinker.seeks = DEFAULT_SEEKS;
- WARN_ON(register_shrinker(&pfdev->shrinker, "drm-panfrost"));
+
+ pfdev->shrinker = shrinker_alloc(0, "drm-panfrost");
+ if (!pfdev->shrinker)
+ return -ENOMEM;
+
+ pfdev->shrinker->count_objects = panfrost_gem_shrinker_count;
+ pfdev->shrinker->scan_objects = panfrost_gem_shrinker_scan;
+ pfdev->shrinker->seeks = DEFAULT_SEEKS;
+ pfdev->shrinker->private_data = pfdev;
+
+ shrinker_register(pfdev->shrinker);
+
+ return 0;
}
/**
@@ -116,7 +123,6 @@ void panfrost_gem_shrinker_cleanup(struct drm_device *dev)
{
struct panfrost_device *pfdev = dev->dev_private;
- if (pfdev->shrinker.nr_deferred) {
- unregister_shrinker(&pfdev->shrinker);
- }
+ if (pfdev->shrinker)
+ shrinker_free(pfdev->shrinker);
}
--
2.30.2
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