diff options
Diffstat (limited to 'drivers/gpu/drm/drm_gem.c')
| -rw-r--r-- | drivers/gpu/drm/drm_gem.c | 207 |
1 files changed, 132 insertions, 75 deletions
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 1e659d2660f7..4a89b6acb6af 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -26,6 +26,7 @@ */ #include <linux/dma-buf.h> +#include <linux/export.h> #include <linux/file.h> #include <linux/fs.h> #include <linux/iosys-map.h> @@ -212,6 +213,46 @@ void drm_gem_private_object_fini(struct drm_gem_object *obj) } EXPORT_SYMBOL(drm_gem_private_object_fini); +static void drm_gem_object_handle_get(struct drm_gem_object *obj) +{ + struct drm_device *dev = obj->dev; + + drm_WARN_ON(dev, !mutex_is_locked(&dev->object_name_lock)); + + if (obj->handle_count++ == 0) + drm_gem_object_get(obj); +} + +/** + * drm_gem_object_handle_get_if_exists_unlocked - acquire reference on user-space handle, if any + * @obj: GEM object + * + * Acquires a reference on the GEM buffer object's handle. Required to keep + * the GEM object alive. Call drm_gem_object_handle_put_if_exists_unlocked() + * to release the reference. Does nothing if the buffer object has no handle. + * + * Returns: + * True if a handle exists, or false otherwise + */ +bool drm_gem_object_handle_get_if_exists_unlocked(struct drm_gem_object *obj) +{ + struct drm_device *dev = obj->dev; + + guard(mutex)(&dev->object_name_lock); + + /* + * First ref taken during GEM object creation, if any. Some + * drivers set up internal framebuffers with GEM objects that + * do not have a GEM handle. Hence, this counter can be zero. + */ + if (!obj->handle_count) + return false; + + drm_gem_object_handle_get(obj); + + return true; +} + /** * drm_gem_object_handle_free - release resources bound to userspace handles * @obj: GEM object to clean up. @@ -242,20 +283,26 @@ static void drm_gem_object_exported_dma_buf_free(struct drm_gem_object *obj) } } -static void -drm_gem_object_handle_put_unlocked(struct drm_gem_object *obj) +/** + * drm_gem_object_handle_put_unlocked - releases reference on user-space handle + * @obj: GEM object + * + * Releases a reference on the GEM buffer object's handle. Possibly releases + * the GEM buffer object and associated dma-buf objects. + */ +void drm_gem_object_handle_put_unlocked(struct drm_gem_object *obj) { struct drm_device *dev = obj->dev; bool final = false; - if (WARN_ON(READ_ONCE(obj->handle_count) == 0)) + if (drm_WARN_ON(dev, READ_ONCE(obj->handle_count) == 0)) return; /* - * Must bump handle count first as this may be the last - * ref, in which case the object would disappear before we - * checked for a name - */ + * Must bump handle count first as this may be the last + * ref, in which case the object would disappear before + * we checked for a name. + */ mutex_lock(&dev->object_name_lock); if (--obj->handle_count == 0) { @@ -279,10 +326,18 @@ drm_gem_object_release_handle(int id, void *ptr, void *data) struct drm_file *file_priv = data; struct drm_gem_object *obj = ptr; + if (drm_WARN_ON(obj->dev, !data)) + return 0; + if (obj->funcs->close) obj->funcs->close(obj, file_priv); + mutex_lock(&file_priv->prime.lock); + drm_prime_remove_buf_handle(&file_priv->prime, id); + + mutex_unlock(&file_priv->prime.lock); + drm_vma_node_revoke(&obj->vma_node, file_priv); drm_gem_object_handle_put_unlocked(obj); @@ -389,8 +444,8 @@ drm_gem_handle_create_tail(struct drm_file *file_priv, int ret; WARN_ON(!mutex_is_locked(&dev->object_name_lock)); - if (obj->handle_count++ == 0) - drm_gem_object_get(obj); + + drm_gem_object_handle_get(obj); /* * Get the user-visible handle using idr. Preload and perform @@ -399,7 +454,7 @@ drm_gem_handle_create_tail(struct drm_file *file_priv, idr_preload(GFP_KERNEL); spin_lock(&file_priv->table_lock); - ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT); + ret = idr_alloc(&file_priv->object_idr, NULL, 1, 0, GFP_NOWAIT); spin_unlock(&file_priv->table_lock); idr_preload_end(); @@ -420,6 +475,11 @@ drm_gem_handle_create_tail(struct drm_file *file_priv, goto err_revoke; } + /* mirrors drm_gem_handle_delete to avoid races */ + spin_lock(&file_priv->table_lock); + obj = idr_replace(&file_priv->object_idr, obj, handle); + WARN_ON(obj != NULL); + spin_unlock(&file_priv->table_lock); *handlep = handle; return 0; @@ -815,14 +875,6 @@ long drm_gem_dma_resv_wait(struct drm_file *filep, u32 handle, } EXPORT_SYMBOL(drm_gem_dma_resv_wait); -/** - * drm_gem_close_ioctl - implementation of the GEM_CLOSE ioctl - * @dev: drm_device - * @data: ioctl data - * @file_priv: drm file-private structure - * - * Releases the handle to an mm object. - */ int drm_gem_close_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) @@ -838,17 +890,6 @@ drm_gem_close_ioctl(struct drm_device *dev, void *data, return ret; } -/** - * drm_gem_flink_ioctl - implementation of the GEM_FLINK ioctl - * @dev: drm_device - * @data: ioctl data - * @file_priv: drm file-private structure - * - * Create a global name for an object, returning the name. - * - * Note that the name does not hold a reference; when the object - * is freed, the name goes away. - */ int drm_gem_flink_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) @@ -888,17 +929,6 @@ err: return ret; } -/** - * drm_gem_open_ioctl - implementation of the GEM_OPEN ioctl - * @dev: drm_device - * @data: ioctl data - * @file_priv: drm file-private structure - * - * Open an object using the global name, returning a handle and the size. - * - * This handle (of course) holds a reference to the object, so the object - * will not go away until the handle is deleted. - */ int drm_gem_open_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) @@ -933,6 +963,57 @@ err: return ret; } +int drm_gem_change_handle_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_gem_change_handle *args = data; + struct drm_gem_object *obj; + int ret; + + if (!drm_core_check_feature(dev, DRIVER_GEM)) + return -EOPNOTSUPP; + + obj = drm_gem_object_lookup(file_priv, args->handle); + if (!obj) + return -ENOENT; + + if (args->handle == args->new_handle) + return 0; + + mutex_lock(&file_priv->prime.lock); + + spin_lock(&file_priv->table_lock); + ret = idr_alloc(&file_priv->object_idr, obj, + args->new_handle, args->new_handle + 1, GFP_NOWAIT); + spin_unlock(&file_priv->table_lock); + + if (ret < 0) + goto out_unlock; + + if (obj->dma_buf) { + ret = drm_prime_add_buf_handle(&file_priv->prime, obj->dma_buf, args->new_handle); + if (ret < 0) { + spin_lock(&file_priv->table_lock); + idr_remove(&file_priv->object_idr, args->new_handle); + spin_unlock(&file_priv->table_lock); + goto out_unlock; + } + + drm_prime_remove_buf_handle(&file_priv->prime, args->handle); + } + + ret = 0; + + spin_lock(&file_priv->table_lock); + idr_remove(&file_priv->object_idr, args->handle); + spin_unlock(&file_priv->table_lock); + +out_unlock: + mutex_unlock(&file_priv->prime.lock); + + return ret; +} + /** * drm_gem_open - initializes GEM file-private structures at devnode open time * @dev: drm_device which is being opened by userspace @@ -1184,38 +1265,6 @@ void drm_gem_print_info(struct drm_printer *p, unsigned int indent, obj->funcs->print_info(p, indent, obj); } -int drm_gem_pin_locked(struct drm_gem_object *obj) -{ - if (obj->funcs->pin) - return obj->funcs->pin(obj); - - return 0; -} - -void drm_gem_unpin_locked(struct drm_gem_object *obj) -{ - if (obj->funcs->unpin) - obj->funcs->unpin(obj); -} - -int drm_gem_pin(struct drm_gem_object *obj) -{ - int ret; - - dma_resv_lock(obj->resv, NULL); - ret = drm_gem_pin_locked(obj); - dma_resv_unlock(obj->resv); - - return ret; -} - -void drm_gem_unpin(struct drm_gem_object *obj) -{ - dma_resv_lock(obj->resv, NULL); - drm_gem_unpin_locked(obj); - dma_resv_unlock(obj->resv); -} - int drm_gem_vmap_locked(struct drm_gem_object *obj, struct iosys_map *map) { int ret; @@ -1460,12 +1509,14 @@ EXPORT_SYMBOL(drm_gem_lru_move_tail); * @nr_to_scan: The number of pages to try to reclaim * @remaining: The number of pages left to reclaim, should be initialized by caller * @shrink: Callback to try to shrink/reclaim the object. + * @ticket: Optional ww_acquire_ctx context to use for locking */ unsigned long drm_gem_lru_scan(struct drm_gem_lru *lru, unsigned int nr_to_scan, unsigned long *remaining, - bool (*shrink)(struct drm_gem_object *obj)) + bool (*shrink)(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket), + struct ww_acquire_ctx *ticket) { struct drm_gem_lru still_in_lru; struct drm_gem_object *obj; @@ -1498,17 +1549,20 @@ drm_gem_lru_scan(struct drm_gem_lru *lru, */ mutex_unlock(lru->lock); + if (ticket) + ww_acquire_init(ticket, &reservation_ww_class); + /* * Note that this still needs to be trylock, since we can * hit shrinker in response to trying to get backing pages * for this obj (ie. while it's lock is already held) */ - if (!dma_resv_trylock(obj->resv)) { + if (!ww_mutex_trylock(&obj->resv->lock, ticket)) { *remaining += obj->size >> PAGE_SHIFT; goto tail; } - if (shrink(obj)) { + if (shrink(obj, ticket)) { freed += obj->size >> PAGE_SHIFT; /* @@ -1522,6 +1576,9 @@ drm_gem_lru_scan(struct drm_gem_lru *lru, dma_resv_unlock(obj->resv); + if (ticket) + ww_acquire_fini(ticket); + tail: drm_gem_object_put(obj); mutex_lock(lru->lock); |