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.viz...@collabora.com>
Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
Cc: Maxime Ripard <maxime.rip...@bootlin.com>
Cc: Sean Paul <s...@poorly.run>
Cc: David Airlie <airl...@linux.ie>
Cc: Daniel Vetter <dan...@ffwll.ch>
Cc: Eric Anholt <e...@anholt.net>
Signed-off-by: Rob Herring <r...@kernel.org>
---
drivers/gpu/drm/drm_gem_shmem_helper.c | 57 ++++++++++++++++++++++++++
include/drm/drm_gem_shmem_helper.h | 15 +++++++
2 files changed, 72 insertions(+)
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
diff --git a/include/drm/drm_gem_shmem_helper.h
b/include/drm/drm_gem_shmem_helper.h
index 038b6d313447..ce1600fdfc3e 100644
--- a/include/drm/drm_gem_shmem_helper.h
+++ b/include/drm/drm_gem_shmem_helper.h
@@ -44,6 +44,9 @@ struct drm_gem_shmem_object {
*/
unsigned int pages_use_count;
+ int madv;
+ struct list_head madv_list;
+
/**
* @pages_mark_dirty_on_put:
*
@@ -121,6 +124,18 @@ void drm_gem_shmem_unpin(struct drm_gem_object *obj);
void *drm_gem_shmem_vmap(struct drm_gem_object *obj);
void drm_gem_shmem_vunmap(struct drm_gem_object *obj, void *vaddr);
+int drm_gem_shmem_madvise(struct drm_gem_object *obj, int madv);
+
+static inline bool drm_gem_shmem_is_purgeable(struct drm_gem_shmem_object
*shmem)
+{
+ return (shmem->madv > 0) &&
+ !shmem->vmap_use_count && shmem->sgt &&
+ !shmem->base.dma_buf && !shmem->base.import_attach;
+}
+
+void drm_gem_shmem_purge_locked(struct drm_gem_object *obj);
+void drm_gem_shmem_purge(struct drm_gem_object *obj);
+
struct drm_gem_shmem_object *
drm_gem_shmem_create_with_handle(struct drm_file *file_priv,
struct drm_device *dev, size_t size,
--
2.20.1
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