Add unlocked variants of drm_gem_un/pin() functions and make them public. These new helpers will take care of GEM dma-reservation locking for DRM drivers.
We are going to add memory shrinking support to the VirtIO-GPU driver that will need to pin framebuffers explicitly to prevent eviction of the actively used buffers by the shrinker. VirtIO-GPU driver will use these new generic helpers to pin shmem framebuffers.
Signed-off-by: Dmitry Osipenko dmitry.osipenko@collabora.com --- drivers/gpu/drm/drm_gem.c | 29 +++++++++++++++++++++++++++++ include/drm/drm_gem.h | 3 +++ 2 files changed, 32 insertions(+)
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index c61674887582..c909c935cfda 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -1179,6 +1179,35 @@ void drm_gem_unpin(struct drm_gem_object *obj) obj->funcs->unpin(obj); }
+int drm_gem_pin_unlocked(struct drm_gem_object *obj) +{ + int ret; + + if (!obj->funcs->pin) + return 0; + + ret = dma_resv_lock_interruptible(obj->resv, NULL); + if (ret) + return ret; + + ret = obj->funcs->pin(obj); + dma_resv_unlock(obj->resv); + + return ret; +} +EXPORT_SYMBOL(drm_gem_pin_unlocked); + +void drm_gem_unpin_unlocked(struct drm_gem_object *obj) +{ + if (!obj->funcs->unpin) + return; + + dma_resv_lock(obj->resv, NULL); + obj->funcs->unpin(obj); + dma_resv_unlock(obj->resv); +} +EXPORT_SYMBOL(drm_gem_unpin_unlocked); + int drm_gem_vmap(struct drm_gem_object *obj, struct iosys_map *map) { int ret; diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h index 0b427939f466..870d81e7a104 100644 --- a/include/drm/drm_gem.h +++ b/include/drm/drm_gem.h @@ -413,4 +413,7 @@ int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, int drm_gem_vmap_unlocked(struct drm_gem_object *obj, struct iosys_map *map); void drm_gem_vunmap_unlocked(struct drm_gem_object *obj, struct iosys_map *map);
+int drm_gem_pin_unlocked(struct drm_gem_object *obj); +void drm_gem_unpin_unlocked(struct drm_gem_object *obj); + #endif /* __DRM_GEM_H__ */