diff options
Diffstat (limited to 'drivers/gpu/drm/drm_gem_shmem_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_gem_shmem_helper.c | 71 |
1 files changed, 69 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 472ea5d81f82..f5918707672f 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -10,6 +10,7 @@ #include <linux/slab.h> #include <linux/vmalloc.h> +#include <drm/drm.h> #include <drm/drm_device.h> #include <drm/drm_drv.h> #include <drm/drm_gem_shmem_helper.h> @@ -74,6 +75,7 @@ struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t shmem = to_drm_gem_shmem_obj(obj); mutex_init(&shmem->pages_lock); mutex_init(&shmem->vmap_lock); + INIT_LIST_HEAD(&shmem->madv_list); /* * Our buffers are kept pinned, so allocating them @@ -117,11 +119,11 @@ void drm_gem_shmem_free_object(struct drm_gem_object *obj) if (shmem->sgt) { dma_unmap_sg(obj->dev->dev, shmem->sgt->sgl, shmem->sgt->nents, DMA_BIDIRECTIONAL); - - drm_gem_shmem_put_pages(shmem); sg_free_table(shmem->sgt); kfree(shmem->sgt); } + if (shmem->pages) + drm_gem_shmem_put_pages(shmem); } WARN_ON(shmem->pages_use_count); @@ -361,6 +363,71 @@ drm_gem_shmem_create_with_handle(struct drm_file *file_priv, } EXPORT_SYMBOL(drm_gem_shmem_create_with_handle); +/* Update madvise status, returns true if not purged, else + * false or -errno. + */ +int drm_gem_shmem_madvise(struct drm_gem_object *obj, int madv) +{ + struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); + + mutex_lock(&shmem->pages_lock); + + if (shmem->madv >= 0) + shmem->madv = madv; + + madv = shmem->madv; + + mutex_unlock(&shmem->pages_lock); + + return (madv >= 0); +} +EXPORT_SYMBOL(drm_gem_shmem_madvise); + +void drm_gem_shmem_purge_locked(struct drm_gem_object *obj) +{ + struct drm_device *dev = obj->dev; + struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); + + WARN_ON(!drm_gem_shmem_is_purgeable(shmem)); + + dma_unmap_sg(obj->dev->dev, shmem->sgt->sgl, + shmem->sgt->nents, DMA_BIDIRECTIONAL); + sg_free_table(shmem->sgt); + kfree(shmem->sgt); + shmem->sgt = NULL; + + drm_gem_shmem_put_pages_locked(shmem); + + shmem->madv = -1; + + drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping); + drm_gem_free_mmap_offset(obj); + + /* Our goal here is to return as much of the memory as + * is possible back to the system as we are called from OOM. + * To do this we must instruct the shmfs to drop all of its + * backing pages, *now*. + */ + shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1); + + invalidate_mapping_pages(file_inode(obj->filp)->i_mapping, + 0, (loff_t)-1); +} +EXPORT_SYMBOL(drm_gem_shmem_purge_locked); + +bool drm_gem_shmem_purge(struct drm_gem_object *obj) +{ + struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); + + if (!mutex_trylock(&shmem->pages_lock)) + return false; + drm_gem_shmem_purge_locked(obj); + mutex_unlock(&shmem->pages_lock); + + return true; +} +EXPORT_SYMBOL(drm_gem_shmem_purge); + /** * drm_gem_shmem_dumb_create - Create a dumb shmem buffer object * @file: DRM file structure to create the dumb buffer for |