diff options
Diffstat (limited to 'drivers/gpu/drm/drm_gem.c')
| -rw-r--r-- | drivers/gpu/drm/drm_gem.c | 414 |
1 files changed, 278 insertions, 136 deletions
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index 59a0bb5ebd85..efc79bbf3c73 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> @@ -100,10 +101,8 @@ drm_gem_init(struct drm_device *dev) vma_offset_manager = drmm_kzalloc(dev, sizeof(*vma_offset_manager), GFP_KERNEL); - if (!vma_offset_manager) { - DRM_ERROR("out of memory\n"); + if (!vma_offset_manager) return -ENOMEM; - } dev->vma_offset_manager = vma_offset_manager; drm_vma_offset_manager_init(vma_offset_manager, @@ -114,22 +113,32 @@ drm_gem_init(struct drm_device *dev) } /** - * drm_gem_object_init - initialize an allocated shmem-backed GEM object + * drm_gem_object_init_with_mnt - initialize an allocated shmem-backed GEM + * object in a given shmfs mountpoint + * * @dev: drm_device the object should be initialized for * @obj: drm_gem_object to initialize * @size: object size + * @gemfs: tmpfs mount where the GEM object will be created. If NULL, use + * the usual tmpfs mountpoint (`shm_mnt`). * * Initialize an already allocated GEM object of the specified size with * shmfs backing store. */ -int drm_gem_object_init(struct drm_device *dev, - struct drm_gem_object *obj, size_t size) +int drm_gem_object_init_with_mnt(struct drm_device *dev, + struct drm_gem_object *obj, size_t size, + struct vfsmount *gemfs) { struct file *filp; drm_gem_private_object_init(dev, obj, size); - filp = shmem_file_setup("drm mm object", size, VM_NORESERVE); + if (gemfs) + filp = shmem_file_setup_with_mnt(gemfs, "drm mm object", size, + VM_NORESERVE); + else + filp = shmem_file_setup("drm mm object", size, VM_NORESERVE); + if (IS_ERR(filp)) return PTR_ERR(filp); @@ -137,6 +146,22 @@ int drm_gem_object_init(struct drm_device *dev, return 0; } +EXPORT_SYMBOL(drm_gem_object_init_with_mnt); + +/** + * drm_gem_object_init - initialize an allocated shmem-backed GEM object + * @dev: drm_device the object should be initialized for + * @obj: drm_gem_object to initialize + * @size: object size + * + * Initialize an already allocated GEM object of the specified size with + * shmfs backing store. + */ +int drm_gem_object_init(struct drm_device *dev, struct drm_gem_object *obj, + size_t size) +{ + return drm_gem_object_init_with_mnt(dev, obj, size, NULL); +} EXPORT_SYMBOL(drm_gem_object_init); /** @@ -160,10 +185,14 @@ void drm_gem_private_object_init(struct drm_device *dev, kref_init(&obj->refcount); obj->handle_count = 0; obj->size = size; + mutex_init(&obj->gpuva.lock); dma_resv_init(&obj->_resv); if (!obj->resv) obj->resv = &obj->_resv; + if (drm_core_check_feature(dev, DRIVER_GEM_GPUVA)) + drm_gem_gpuva_init(obj); + drm_vma_node_reset(&obj->vma_node); INIT_LIST_HEAD(&obj->lru_node); } @@ -180,9 +209,50 @@ void drm_gem_private_object_fini(struct drm_gem_object *obj) WARN_ON(obj->dma_buf); dma_resv_fini(&obj->_resv); + mutex_destroy(&obj->gpuva.lock); } 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. @@ -213,20 +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) { @@ -250,10 +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); @@ -319,7 +403,7 @@ int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, return -ENOENT; /* Don't allow imported objects to be mapped */ - if (obj->import_attach) { + if (drm_gem_is_imported(obj)) { ret = -EINVAL; goto out; } @@ -336,13 +420,6 @@ out: } EXPORT_SYMBOL_GPL(drm_gem_dumb_map_offset); -int drm_gem_dumb_destroy(struct drm_file *file, - struct drm_device *dev, - u32 handle) -{ - return drm_gem_handle_delete(file, handle); -} - /** * drm_gem_handle_create_tail - internal functions to create a handle * @file_priv: drm file-private structure to register the handle for @@ -367,8 +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 @@ -377,7 +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(); @@ -398,6 +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; @@ -503,13 +585,13 @@ int drm_gem_create_mmap_offset(struct drm_gem_object *obj) EXPORT_SYMBOL(drm_gem_create_mmap_offset); /* - * Move pages to appropriate lru and release the pagevec, decrementing the - * ref count of those pages. + * Move folios to appropriate lru and release the folios, decrementing the + * ref count of those folios. */ -static void drm_gem_check_release_pagevec(struct pagevec *pvec) +static void drm_gem_check_release_batch(struct folio_batch *fbatch) { - check_move_unevictable_pages(pvec); - __pagevec_release(pvec); + check_move_unevictable_folios(fbatch); + __folio_batch_release(fbatch); cond_resched(); } @@ -541,10 +623,10 @@ static void drm_gem_check_release_pagevec(struct pagevec *pvec) struct page **drm_gem_get_pages(struct drm_gem_object *obj) { struct address_space *mapping; - struct page *p, **pages; - struct pagevec pvec; - int i, npages; - + struct page **pages; + struct folio *folio; + struct folio_batch fbatch; + unsigned long i, j, npages; if (WARN_ON(!obj->filp)) return ERR_PTR(-EINVAL); @@ -566,11 +648,16 @@ struct page **drm_gem_get_pages(struct drm_gem_object *obj) mapping_set_unevictable(mapping); - for (i = 0; i < npages; i++) { - p = shmem_read_mapping_page(mapping, i); - if (IS_ERR(p)) + i = 0; + while (i < npages) { + unsigned long nr; + folio = shmem_read_folio_gfp(mapping, i, + mapping_gfp_mask(mapping)); + if (IS_ERR(folio)) goto fail; - pages[i] = p; + nr = min(npages - i, folio_nr_pages(folio)); + for (j = 0; j < nr; j++, i++) + pages[i] = folio_file_page(folio, i); /* Make sure shmem keeps __GFP_DMA32 allocated pages in the * correct region during swapin. Note that this requires @@ -578,23 +665,26 @@ struct page **drm_gem_get_pages(struct drm_gem_object *obj) * so shmem can relocate pages during swapin if required. */ BUG_ON(mapping_gfp_constraint(mapping, __GFP_DMA32) && - (page_to_pfn(p) >= 0x00100000UL)); + (folio_pfn(folio) >= 0x00100000UL)); } return pages; fail: mapping_clear_unevictable(mapping); - pagevec_init(&pvec); - while (i--) { - if (!pagevec_add(&pvec, pages[i])) - drm_gem_check_release_pagevec(&pvec); + folio_batch_init(&fbatch); + j = 0; + while (j < i) { + struct folio *f = page_folio(pages[j]); + if (!folio_batch_add(&fbatch, f)) + drm_gem_check_release_batch(&fbatch); + j += folio_nr_pages(f); } - if (pagevec_count(&pvec)) - drm_gem_check_release_pagevec(&pvec); + if (fbatch.nr) + drm_gem_check_release_batch(&fbatch); kvfree(pages); - return ERR_CAST(p); + return ERR_CAST(folio); } EXPORT_SYMBOL(drm_gem_get_pages); @@ -610,7 +700,7 @@ void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, { int i, npages; struct address_space *mapping; - struct pagevec pvec; + struct folio_batch fbatch; mapping = file_inode(obj->filp)->i_mapping; mapping_clear_unevictable(mapping); @@ -623,23 +713,27 @@ void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, npages = obj->size >> PAGE_SHIFT; - pagevec_init(&pvec); + folio_batch_init(&fbatch); for (i = 0; i < npages; i++) { + struct folio *folio; + if (!pages[i]) continue; + folio = page_folio(pages[i]); if (dirty) - set_page_dirty(pages[i]); + folio_mark_dirty(folio); if (accessed) - mark_page_accessed(pages[i]); + folio_mark_accessed(folio); /* Undo the reference we took when populating the table */ - if (!pagevec_add(&pvec, pages[i])) - drm_gem_check_release_pagevec(&pvec); + if (!folio_batch_add(&fbatch, folio)) + drm_gem_check_release_batch(&fbatch); + i += folio_nr_pages(folio) - 1; } - if (pagevec_count(&pvec)) - drm_gem_check_release_pagevec(&pvec); + if (folio_batch_count(&fbatch)) + drm_gem_check_release_batch(&fbatch); kvfree(pages); } @@ -681,7 +775,6 @@ static int objects_lookup(struct drm_file *filp, u32 *handle, int count, * For a single handle lookup, use drm_gem_object_lookup(). * * Returns: - * * @objs filled in with GEM object pointers. Returned GEM objects need to be * released with drm_gem_object_put(). -ENOENT is returned on a lookup * failure. 0 is returned on success. @@ -690,9 +783,9 @@ static int objects_lookup(struct drm_file *filp, u32 *handle, int count, int drm_gem_objects_lookup(struct drm_file *filp, void __user *bo_handles, int count, struct drm_gem_object ***objs_out) { - int ret; - u32 *handles; struct drm_gem_object **objs; + u32 *handles; + int ret; if (!count) return 0; @@ -704,20 +797,11 @@ int drm_gem_objects_lookup(struct drm_file *filp, void __user *bo_handles, *objs_out = objs; - handles = kvmalloc_array(count, sizeof(u32), GFP_KERNEL); - if (!handles) { - ret = -ENOMEM; - goto out; - } - - if (copy_from_user(handles, bo_handles, count * sizeof(u32))) { - ret = -EFAULT; - DRM_DEBUG("Failed to copy in GEM handles\n"); - goto out; - } + handles = vmemdup_array_user(bo_handles, count, sizeof(u32)); + if (IS_ERR(handles)) + return PTR_ERR(handles); ret = objects_lookup(filp, handles, count, objs); -out: kvfree(handles); return ret; @@ -729,12 +813,11 @@ EXPORT_SYMBOL(drm_gem_objects_lookup); * @filp: DRM file private date * @handle: userspace handle * - * Returns: + * If looking up an array of handles, use drm_gem_objects_lookup(). * + * Returns: * A reference to the object named by the handle if such exists on @filp, NULL * otherwise. - * - * If looking up an array of handles, use drm_gem_objects_lookup(). */ struct drm_gem_object * drm_gem_object_lookup(struct drm_file *filp, u32 handle) @@ -755,19 +838,19 @@ EXPORT_SYMBOL(drm_gem_object_lookup); * @timeout: timeout value in jiffies or zero to return immediately * * Returns: - * * Returns -ERESTARTSYS if interrupted, 0 if the wait timed out, or * greater than 0 on success. */ long drm_gem_dma_resv_wait(struct drm_file *filep, u32 handle, bool wait_all, unsigned long timeout) { - long ret; + struct drm_device *dev = filep->minor->dev; struct drm_gem_object *obj; + long ret; obj = drm_gem_object_lookup(filep, handle); if (!obj) { - DRM_DEBUG("Failed to look up GEM BO %d\n", handle); + drm_dbg_core(dev, "Failed to look up GEM BO %d\n", handle); return -EINVAL; } @@ -784,14 +867,6 @@ 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) @@ -807,17 +882,6 @@ 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) @@ -857,17 +921,6 @@ 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) @@ -902,6 +955,57 @@ 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 @@ -1060,7 +1164,7 @@ int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size, goto err_drm_gem_object_put; } - vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; + vm_flags_set(vma, VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP); vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); } @@ -1147,27 +1251,13 @@ void drm_gem_print_info(struct drm_printer *p, unsigned int indent, drm_vma_node_start(&obj->vma_node)); drm_printf_indent(p, indent, "size=%zu\n", obj->size); drm_printf_indent(p, indent, "imported=%s\n", - str_yes_no(obj->import_attach)); + str_yes_no(drm_gem_is_imported(obj))); if (obj->funcs->print_info) obj->funcs->print_info(p, indent, obj); } -int drm_gem_pin(struct drm_gem_object *obj) -{ - if (obj->funcs->pin) - return obj->funcs->pin(obj); - else - return 0; -} - -void drm_gem_unpin(struct drm_gem_object *obj) -{ - if (obj->funcs->unpin) - obj->funcs->unpin(obj); -} - -int drm_gem_vmap(struct drm_gem_object *obj, struct iosys_map *map) +int drm_gem_vmap_locked(struct drm_gem_object *obj, struct iosys_map *map) { int ret; @@ -1184,9 +1274,9 @@ int drm_gem_vmap(struct drm_gem_object *obj, struct iosys_map *map) return 0; } -EXPORT_SYMBOL(drm_gem_vmap); +EXPORT_SYMBOL(drm_gem_vmap_locked); -void drm_gem_vunmap(struct drm_gem_object *obj, struct iosys_map *map) +void drm_gem_vunmap_locked(struct drm_gem_object *obj, struct iosys_map *map) { dma_resv_assert_held(obj->resv); @@ -1199,27 +1289,39 @@ void drm_gem_vunmap(struct drm_gem_object *obj, struct iosys_map *map) /* Always set the mapping to NULL. Callers may rely on this. */ iosys_map_clear(map); } -EXPORT_SYMBOL(drm_gem_vunmap); +EXPORT_SYMBOL(drm_gem_vunmap_locked); + +void drm_gem_lock(struct drm_gem_object *obj) +{ + dma_resv_lock(obj->resv, NULL); +} +EXPORT_SYMBOL(drm_gem_lock); -int drm_gem_vmap_unlocked(struct drm_gem_object *obj, struct iosys_map *map) +void drm_gem_unlock(struct drm_gem_object *obj) +{ + dma_resv_unlock(obj->resv); +} +EXPORT_SYMBOL(drm_gem_unlock); + +int drm_gem_vmap(struct drm_gem_object *obj, struct iosys_map *map) { int ret; dma_resv_lock(obj->resv, NULL); - ret = drm_gem_vmap(obj, map); + ret = drm_gem_vmap_locked(obj, map); dma_resv_unlock(obj->resv); return ret; } -EXPORT_SYMBOL(drm_gem_vmap_unlocked); +EXPORT_SYMBOL(drm_gem_vmap); -void drm_gem_vunmap_unlocked(struct drm_gem_object *obj, struct iosys_map *map) +void drm_gem_vunmap(struct drm_gem_object *obj, struct iosys_map *map) { dma_resv_lock(obj->resv, NULL); - drm_gem_vunmap(obj, map); + drm_gem_vunmap_locked(obj, map); dma_resv_unlock(obj->resv); } -EXPORT_SYMBOL(drm_gem_vunmap_unlocked); +EXPORT_SYMBOL(drm_gem_vunmap); /** * drm_gem_lock_reservations - Sets up the ww context and acquires @@ -1344,7 +1446,15 @@ drm_gem_lru_remove(struct drm_gem_object *obj) } EXPORT_SYMBOL(drm_gem_lru_remove); -static void +/** + * drm_gem_lru_move_tail_locked - move the object to the tail of the LRU + * + * Like &drm_gem_lru_move_tail but lru lock must be held + * + * @lru: The LRU to move the object into. + * @obj: The GEM object to move into this LRU + */ +void drm_gem_lru_move_tail_locked(struct drm_gem_lru *lru, struct drm_gem_object *obj) { lockdep_assert_held_once(lru->lock); @@ -1356,6 +1466,7 @@ drm_gem_lru_move_tail_locked(struct drm_gem_lru *lru, struct drm_gem_object *obj list_add_tail(&obj->lru_node, &lru->list); obj->lru = lru; } +EXPORT_SYMBOL(drm_gem_lru_move_tail_locked); /** * drm_gem_lru_move_tail - move the object to the tail of the LRU @@ -1388,11 +1499,16 @@ EXPORT_SYMBOL(drm_gem_lru_move_tail); * * @lru: The LRU to scan * @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 nr_to_scan, - bool (*shrink)(struct drm_gem_object *obj)) +drm_gem_lru_scan(struct drm_gem_lru *lru, + unsigned int nr_to_scan, + unsigned long *remaining, + 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; @@ -1425,15 +1541,20 @@ drm_gem_lru_scan(struct drm_gem_lru *lru, unsigned nr_to_scan, */ 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; /* @@ -1447,6 +1568,9 @@ drm_gem_lru_scan(struct drm_gem_lru *lru, unsigned nr_to_scan, dma_resv_unlock(obj->resv); + if (ticket) + ww_acquire_fini(ticket); + tail: drm_gem_object_put(obj); mutex_lock(lru->lock); @@ -1466,3 +1590,21 @@ tail: return freed; } EXPORT_SYMBOL(drm_gem_lru_scan); + +/** + * drm_gem_evict_locked - helper to evict backing pages for a GEM object + * @obj: obj in question + */ +int drm_gem_evict_locked(struct drm_gem_object *obj) +{ + dma_resv_assert_held(obj->resv); + + if (!dma_resv_test_signaled(obj->resv, DMA_RESV_USAGE_READ)) + return -EBUSY; + + if (obj->funcs->evict) + return obj->funcs->evict(obj); + + return 0; +} +EXPORT_SYMBOL(drm_gem_evict_locked); |