diff options
| author | Danilo Krummrich <dakr@redhat.com> | 2023-08-04 20:23:41 +0200 |
|---|---|---|
| committer | Danilo Krummrich <dakr@redhat.com> | 2023-08-04 20:34:31 +0200 |
| commit | 0c0816d68d963302a7f4a7a28cc685f73263b964 (patch) | |
| tree | 7593e11e40c647699126a533a5428da41cc02cee /include | |
| parent | a5ae331edb02b6645514f7632478733439e28b34 (diff) | |
drm/gem: fix lockdep check for dma-resv lock
When no custom lock is set to protect a GEMs GPUVA list, lockdep checks
should fall back to the GEM objects dma-resv lock. With the current
implementation we're setting the lock_dep_map of the GEM objects 'resv'
pointer (in case no custom lock_dep_map is set yet) on
drm_gem_private_object_init().
However, the GEM objects 'resv' pointer might still change after
drm_gem_private_object_init() is called, e.g. through
ttm_bo_init_reserved(). This can result in the wrong lock being tracked.
To fix this, call dma_resv_held() directly from
drm_gem_gpuva_assert_lock_held() and fall back to the GEMs lock_dep_map
pointer only if an actual custom lock is set.
Fixes: e6303f323b1a ("drm: manager to keep track of GPUs VA mappings")
Reviewed-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230804182406.5222-2-dakr@redhat.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/drm/drm_gem.h | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h index c0b13c43b459..bc9f6aa2f3fe 100644 --- a/include/drm/drm_gem.h +++ b/include/drm/drm_gem.h @@ -551,15 +551,17 @@ int drm_gem_evict(struct drm_gem_object *obj); * @lock: the lock used to protect the gpuva list. The locking primitive * must contain a dep_map field. * - * Call this if you're not proctecting access to the gpuva list - * with the dma-resv lock, otherwise, drm_gem_gpuva_init() takes care - * of initializing lock_dep_map for you. + * Call this if you're not proctecting access to the gpuva list with the + * dma-resv lock, but with a custom lock. */ #define drm_gem_gpuva_set_lock(obj, lock) \ - if (!(obj)->gpuva.lock_dep_map) \ + if (!WARN((obj)->gpuva.lock_dep_map, \ + "GEM GPUVA lock should be set only once.")) \ (obj)->gpuva.lock_dep_map = &(lock)->dep_map #define drm_gem_gpuva_assert_lock_held(obj) \ - lockdep_assert(lock_is_held((obj)->gpuva.lock_dep_map)) + lockdep_assert((obj)->gpuva.lock_dep_map ? \ + lock_is_held((obj)->gpuva.lock_dep_map) : \ + dma_resv_held((obj)->resv)) #else #define drm_gem_gpuva_set_lock(obj, lock) do {} while (0) #define drm_gem_gpuva_assert_lock_held(obj) do {} while (0) @@ -573,11 +575,12 @@ int drm_gem_evict(struct drm_gem_object *obj); * * Calling this function is only necessary for drivers intending to support the * &drm_driver_feature DRIVER_GEM_GPUVA. + * + * See also drm_gem_gpuva_set_lock(). */ static inline void drm_gem_gpuva_init(struct drm_gem_object *obj) { INIT_LIST_HEAD(&obj->gpuva.list); - drm_gem_gpuva_set_lock(obj, &obj->resv->lock.base); } /** |