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author | Rob Herring <robh@kernel.org> | 2019-08-05 08:33:57 -0600 |
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committer | Rob Herring <robh@kernel.org> | 2019-08-08 15:54:10 -0600 |
commit | 17acb9f35ed736c177f85b8ee711f278e7aff421 (patch) | |
tree | d888de0d99ed6638215fec5dcc7073ca25b9ea77 /drivers/gpu/drm/drm_gem_shmem_helper.c | |
parent | 3551a9fa2c5d3f3b0a34af67d33a0f2a5fecd94c (diff) | |
download | linux-17acb9f35ed736c177f85b8ee711f278e7aff421.tar.bz2 |
drm/shmem: Add madvise state and purge helpers
Add support to the shmem GEM helpers for tracking madvise state and
purging pages. This is based on the msm implementation.
The BO provides a list_head, but the list management is handled outside
of the shmem helpers as there are different locking requirements.
Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Eric Anholt <eric@anholt.net>
Acked-by: Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190805143358.21245-1-robh@kernel.org
Diffstat (limited to 'drivers/gpu/drm/drm_gem_shmem_helper.c')
-rw-r--r-- | drivers/gpu/drm/drm_gem_shmem_helper.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c index 2f64667ac805..4b442576de1c 100644 --- a/drivers/gpu/drm/drm_gem_shmem_helper.c +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c @@ -75,6 +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 @@ -362,6 +363,62 @@ 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)); + + 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); + +void drm_gem_shmem_purge(struct drm_gem_object *obj) +{ + struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj); + + mutex_lock(&shmem->pages_lock); + drm_gem_shmem_purge_locked(obj); + mutex_unlock(&shmem->pages_lock); +} +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 |