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drm/msm: Implement .gem_free_object_unlocked

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We use a llist and a worker to delay the object cleanup. This avoids
taking mmap_sem and struct mutex in the wrong order when calling
drm_gem_object_put-unlocked() from drm_gem_mmap().

Fixes lockdep problem with copy_from_user() in msm_ioctl_gem_submit().

Change-Id: Idfe54ae8108158b69f3835f26991642d1e21f8ee
Signed-off-by: Kristian H. Kristensen <hoegsberg@chromium.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Git-commit: 48e7f18392c66f9b69ebac11c54f1a2e033ced54
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[samtran@codeaurora.org: resolve trivial merge conflict]
Signed-off-by: Samantha Tran <samtran@codeaurora.org>
This commit is contained in:
Kristian H. Kristensen
2021-03-23 13:35:31 -07:00
committed by Samantha Tran
parent 19e9831a45
commit a145e793b2
4 changed files with 42 additions and 0 deletions
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5
msm/msm_drv.h
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@@ -891,6 +891,10 @@ struct msm_drm_private {
/* list of GEM objects: */
struct list_head inactive_list;
/* worker for delayed free of objects: */
struct work_struct free_work;
struct llist_head free_list;
struct workqueue_struct *wq;
/* crtcs pending async atomic updates: */
@@ -1130,6 +1134,7 @@ void *msm_gem_kernel_new_locked(struct drm_device *dev, uint32_t size,
struct drm_gem_object **bo, uint64_t *iova);
struct drm_gem_object *msm_gem_import(struct drm_device *dev,
struct dma_buf *dmabuf, struct sg_table *sgt);
void msm_gem_free_work(struct work_struct *work);
__printf(2, 3)
void msm_gem_object_set_name(struct drm_gem_object *bo, const char *fmt, ...);