The helper drm_gem_shmem_create_object_cached() allocates an GEM SHMEM
object and sets the map_cached flag. Useful for drivers that want cached
mappings.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/gpu/drm/drm_gem_shmem_helper.c | 27 ++++++++++++++++++++++++++
include/drm/drm_gem_shmem_helper.h | 4 ++++
2 files changed, 31 insertions(+)
diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index df31e5782eed1..ab28b7ff864cb 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -433,6 +433,33 @@ bool drm_gem_shmem_purge(struct drm_gem_object *obj)
}
EXPORT_SYMBOL(drm_gem_shmem_purge);
+/**
+ * drm_gem_shmem_create_object_cached - Create a shmem buffer object with
+ * cached mappings
+ * @dev: DRM device
+ * @size: Size of the object to allocate
+ *
+ * By default, shmem buffer objects use writecombine mappings. This
+ * function implements struct drm_driver.gem_create_object for shmem
+ * buffer objects with cached mappings.
+ *
+ * Returns:
+ * A struct drm_gem_shmem_object * on success or NULL negative on failure.
+ */
+struct drm_gem_object *
+drm_gem_shmem_create_object_cached(struct drm_device *dev, size_t size)
+{
+ struct drm_gem_shmem_object *shmem;
+
+ shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
+ if (!shmem)
+ return NULL;
+ shmem->map_cached = true;
+
+ return &shmem->base;
+}
+EXPORT_SYMBOL(drm_gem_shmem_create_object_cached);
+
/**
* 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 294b2931c4cc0..5381f0c8cf6f6 100644
--- a/include/drm/drm_gem_shmem_helper.h
+++ b/include/drm/drm_gem_shmem_helper.h
@@ -132,6 +132,10 @@ struct drm_gem_shmem_object *
drm_gem_shmem_create_with_handle(struct drm_file *file_priv,
struct drm_device *dev, size_t size,
uint32_t *handle);
+
+struct drm_gem_object *
+drm_gem_shmem_create_object_cached(struct drm_device *dev, size_t size);
+
int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
struct drm_mode_create_dumb *args);
--
2.26.2
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