From: Rob Clark <robdclark@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: Daniel Vetter <daniel@ffwll.ch>,
Rob Clark <robdclark@chromium.org>,
Rob Clark <robdclark@gmail.com>, Sean Paul <sean@poorly.run>,
David Airlie <airlied@linux.ie>,
linux-arm-msm@vger.kernel.org (open list:DRM DRIVER FOR MSM
ADRENO GPU),
freedreno@lists.freedesktop.org (open list:DRM DRIVER FOR MSM
ADRENO GPU), linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v2 21/22] drm/msm: Drop struct_mutex in shrinker path
Date: Sun, 11 Oct 2020 19:09:48 -0700 [thread overview]
Message-ID: <20201012020958.229288-22-robdclark@gmail.com> (raw)
In-Reply-To: <20201012020958.229288-1-robdclark@gmail.com>
From: Rob Clark <robdclark@chromium.org>
Now that the inactive_list is protected by mm_lock, and everything
else on per-obj basis is protected by obj->lock, we no longer depend
on struct_mutex.
Signed-off-by: Rob Clark <robdclark@chromium.org>
---
drivers/gpu/drm/msm/msm_gem.c | 1 -
drivers/gpu/drm/msm/msm_gem_shrinker.c | 54 --------------------------
2 files changed, 55 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 8852c05775dc..ca00c3ccd413 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -673,7 +673,6 @@ void msm_gem_purge(struct drm_gem_object *obj)
struct drm_device *dev = obj->dev;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
- WARN_ON(!mutex_is_locked(&dev->struct_mutex));
WARN_ON(!is_purgeable(msm_obj));
WARN_ON(obj->import_attach);
diff --git a/drivers/gpu/drm/msm/msm_gem_shrinker.c b/drivers/gpu/drm/msm/msm_gem_shrinker.c
index 6be073b8ca08..6f4b1355725f 100644
--- a/drivers/gpu/drm/msm/msm_gem_shrinker.c
+++ b/drivers/gpu/drm/msm/msm_gem_shrinker.c
@@ -8,48 +8,13 @@
#include "msm_gem.h"
#include "msm_gpu_trace.h"
-static bool msm_gem_shrinker_lock(struct drm_device *dev, bool *unlock)
-{
- /* NOTE: we are *closer* to being able to get rid of
- * mutex_trylock_recursive().. the msm_gem code itself does
- * not need struct_mutex, although codepaths that can trigger
- * shrinker are still called in code-paths that hold the
- * struct_mutex.
- *
- * Also, msm_obj->madv is protected by struct_mutex.
- *
- * The next step is probably split out a seperate lock for
- * protecting inactive_list, so that shrinker does not need
- * struct_mutex.
- */
- switch (mutex_trylock_recursive(&dev->struct_mutex)) {
- case MUTEX_TRYLOCK_FAILED:
- return false;
-
- case MUTEX_TRYLOCK_SUCCESS:
- *unlock = true;
- return true;
-
- case MUTEX_TRYLOCK_RECURSIVE:
- *unlock = false;
- return true;
- }
-
- BUG();
-}
-
static unsigned long
msm_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc)
{
struct msm_drm_private *priv =
container_of(shrinker, struct msm_drm_private, shrinker);
- struct drm_device *dev = priv->dev;
struct msm_gem_object *msm_obj;
unsigned long count = 0;
- bool unlock;
-
- if (!msm_gem_shrinker_lock(dev, &unlock))
- return 0;
mutex_lock(&priv->mm_lock);
@@ -63,9 +28,6 @@ msm_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc)
mutex_unlock(&priv->mm_lock);
- if (unlock)
- mutex_unlock(&dev->struct_mutex);
-
return count;
}
@@ -74,13 +36,8 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
{
struct msm_drm_private *priv =
container_of(shrinker, struct msm_drm_private, shrinker);
- struct drm_device *dev = priv->dev;
struct msm_gem_object *msm_obj;
unsigned long freed = 0;
- bool unlock;
-
- if (!msm_gem_shrinker_lock(dev, &unlock))
- return SHRINK_STOP;
mutex_lock(&priv->mm_lock);
@@ -98,9 +55,6 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
mutex_unlock(&priv->mm_lock);
- if (unlock)
- mutex_unlock(&dev->struct_mutex);
-
if (freed > 0)
trace_msm_gem_purge(freed << PAGE_SHIFT);
@@ -112,13 +66,8 @@ msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr)
{
struct msm_drm_private *priv =
container_of(nb, struct msm_drm_private, vmap_notifier);
- struct drm_device *dev = priv->dev;
struct msm_gem_object *msm_obj;
unsigned unmapped = 0;
- bool unlock;
-
- if (!msm_gem_shrinker_lock(dev, &unlock))
- return NOTIFY_DONE;
mutex_lock(&priv->mm_lock);
@@ -141,9 +90,6 @@ msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr)
mutex_unlock(&priv->mm_lock);
- if (unlock)
- mutex_unlock(&dev->struct_mutex);
-
*(unsigned long *)ptr += unmapped;
if (unmapped > 0)
--
2.26.2
next prev parent reply other threads:[~2020-10-12 2:09 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-12 2:09 [PATCH 00/14] drm/msm: de-struct_mutex-ification Rob Clark
2020-10-12 2:09 ` [PATCH v2 01/22] drm/msm/gem: Add obj->lock wrappers Rob Clark
2020-10-12 2:09 ` [PATCH v2 02/22] drm/msm/gem: Rename internal get_iova_locked helper Rob Clark
2020-10-12 2:09 ` [PATCH v2 03/22] drm/msm/gem: Move prototypes to msm_gem.h Rob Clark
2020-10-12 2:09 ` [PATCH v2 04/22] drm/msm/gem: Add some _locked() helpers Rob Clark
2020-10-12 2:09 ` [PATCH v2 05/22] drm/msm/gem: Move locking in shrinker path Rob Clark
2020-10-12 2:09 ` [PATCH v2 06/22] drm/msm/submit: Move copy_from_user ahead of locking bos Rob Clark
2020-10-12 2:09 ` [PATCH v2 07/22] drm/msm: Do rpm get sooner in the submit path Rob Clark
2020-10-12 14:35 ` Daniel Vetter
2020-10-12 15:43 ` Rob Clark
2020-10-20 9:07 ` Viresh Kumar
2020-10-20 10:56 ` Daniel Vetter
2020-10-20 11:24 ` Viresh Kumar
2020-10-20 11:42 ` Daniel Vetter
2020-10-20 14:13 ` Rob Clark
2020-10-22 8:06 ` Viresh Kumar
2020-10-25 17:39 ` Rob Clark
2020-10-27 11:35 ` Viresh Kumar
2020-11-03 5:47 ` Viresh Kumar
2020-11-03 16:50 ` Rob Clark
2020-11-04 3:03 ` Viresh Kumar
2020-11-05 19:24 ` Rob Clark
2020-11-06 7:16 ` Viresh Kumar
2020-11-17 10:03 ` Viresh Kumar
2020-11-17 17:02 ` Rob Clark
2020-11-18 5:28 ` Viresh Kumar
2020-11-18 16:53 ` Rob Clark
2020-11-19 6:05 ` Viresh Kumar
2020-12-07 6:16 ` Viresh Kumar
2020-12-16 5:22 ` Viresh Kumar
2020-10-12 2:09 ` [PATCH v2 08/22] drm/msm/gem: Switch over to obj->resv for locking Rob Clark
2020-10-12 2:09 ` [PATCH v2 09/22] drm/msm: Use correct drm_gem_object_put() in fail case Rob Clark
2020-10-12 2:09 ` [PATCH v2 10/22] drm/msm: Drop chatty trace Rob Clark
2020-10-12 2:09 ` [PATCH v2 11/22] drm/msm: Move update_fences() Rob Clark
2020-10-12 2:09 ` [PATCH v2 12/22] drm/msm: Add priv->mm_lock to protect active/inactive lists Rob Clark
2020-10-12 2:09 ` [PATCH v2 13/22] drm/msm: Document and rename preempt_lock Rob Clark
2020-10-12 2:09 ` [PATCH v2 14/22] drm/msm: Protect ring->submits with it's own lock Rob Clark
2020-10-12 2:09 ` [PATCH v2 15/22] drm/msm: Refcount submits Rob Clark
2020-10-12 2:09 ` [PATCH v2 16/22] drm/msm: Remove obj->gpu Rob Clark
2020-10-12 2:09 ` [PATCH v2 17/22] drm/msm: Drop struct_mutex from the retire path Rob Clark
2020-10-12 2:09 ` [PATCH v2 18/22] drm/msm: Drop struct_mutex in free_object() path Rob Clark
2020-10-12 2:09 ` [PATCH v2 19/22] drm/msm: remove msm_gem_free_work Rob Clark
2020-10-12 2:09 ` [PATCH v2 20/22] drm/msm: drop struct_mutex in madvise path Rob Clark
2020-10-12 2:09 ` Rob Clark [this message]
2020-10-12 2:09 ` [PATCH v2 22/22] drm/msm: Don't implicit-sync if only a single ring Rob Clark
2020-10-12 14:40 ` Daniel Vetter
2020-10-12 15:07 ` Rob Clark
2020-10-13 11:08 ` Daniel Vetter
2020-10-13 16:15 ` [Freedreno] " Rob Clark
2020-10-15 8:22 ` Daniel Vetter
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