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From 141a7a5b253a80a5c7f2fb991a3311420250199d Mon Sep 17 00:00:00 2001
From: Christian Koenig <christian.koenig@amd.com>
Date: Mon, 11 Sep 2017 18:19:39 -0400
Subject: [PATCH 0916/4131] drm/amdgpu: use a rw_semaphore for MMU notifiers
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Allow at least some parallel processing.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Kalyan Alle <kalyan.alle@amd.com>
Conflicts:
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
Change-Id: Ia2c13487a91dcf01c954632579d9b00fdae44c81
---
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
index 06b031f..14f313e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
@@ -50,7 +50,7 @@ struct amdgpu_mn {
struct hlist_node node;
/* objects protected by lock */
- struct mutex lock;
+ struct rw_semaphore lock;
struct rb_root_cached objects;
};
@@ -74,7 +74,7 @@ static void amdgpu_mn_destroy(struct work_struct *work)
struct amdgpu_bo *bo, *next_bo;
mutex_lock(&adev->mn_lock);
- mutex_lock(&rmn->lock);
+ down_write(&rmn->lock);
hash_del(&rmn->node);
rbtree_postorder_for_each_entry_safe(node, next_node,
&rmn->objects.rb_root, it.rb) {
@@ -84,7 +84,7 @@ static void amdgpu_mn_destroy(struct work_struct *work)
}
kfree(node);
}
- mutex_unlock(&rmn->lock);
+ up_write(&rmn->lock);
mutex_unlock(&adev->mn_lock);
mmu_notifier_unregister_no_release(&rmn->mn, rmn->mm);
kfree(rmn);
@@ -165,7 +165,7 @@ static void amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,
/* notification is exclusive, but interval is inclusive */
end -= 1;
- mutex_lock(&rmn->lock);
+ down_read(&rmn->lock);
it = interval_tree_iter_first(&rmn->objects, start, end);
while (it) {
@@ -177,7 +177,7 @@ static void amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,
amdgpu_mn_invalidate_node(node, start, end);
}
- mutex_unlock(&rmn->lock);
+ up_read(&rmn->lock);
}
static const struct mmu_notifier_ops amdgpu_mn_ops = {
@@ -217,7 +217,7 @@ static struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev)
rmn->adev = adev;
rmn->mm = mm;
rmn->mn.ops = &amdgpu_mn_ops;
- mutex_init(&rmn->lock);
+ init_rwsem(&rmn->lock);
rmn->objects = RB_ROOT_CACHED;
r = __mmu_notifier_register(&rmn->mn, mm);
@@ -264,7 +264,7 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
INIT_LIST_HEAD(&bos);
- mutex_lock(&rmn->lock);
+ down_write(&rmn->lock);
while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {
kfree(node);
@@ -278,7 +278,7 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
if (!node) {
node = kmalloc(sizeof(struct amdgpu_mn_node), GFP_NOIO);
if (!node) {
- mutex_unlock(&rmn->lock);
+ up_write(&rmn->lock);
return -ENOMEM;
}
}
@@ -293,7 +293,7 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
interval_tree_insert(&node->it, &rmn->objects);
- mutex_unlock(&rmn->lock);
+ up_write(&rmn->lock);
return 0;
}
@@ -319,7 +319,7 @@ void amdgpu_mn_unregister(struct amdgpu_bo *bo)
return;
}
- mutex_lock(&rmn->lock);
+ down_write(&rmn->lock);
/* save the next list entry for later */
head = bo->mn_list.next;
@@ -334,6 +334,6 @@ void amdgpu_mn_unregister(struct amdgpu_bo *bo)
kfree(node);
}
- mutex_unlock(&rmn->lock);
+ up_write(&rmn->lock);
mutex_unlock(&adev->mn_lock);
}
--
2.7.4
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