[PATCH v19 13/30] drm/shmem-helper: Make drm_gem_shmem_get_pages() public

[Dmitry Osipenko]

We're going to move away from having implicit get_pages() done by
get_pages_sgt() to simplify refcnt handling. Drivers will manage
get/put_pages() by themselves. Expose the drm_gem_shmem_get_pages()
in a public drm-shmem API.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/drm_gem_shmem_helper.c | 10 +++++++++-
 include/drm/drm_gem_shmem_helper.h     |  1 +
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c b/drivers/gpu/drm/drm_gem_shmem_helper.c
index 799a3c5015ad..dc416a4bce1b 100644
--- a/drivers/gpu/drm/drm_gem_shmem_helper.c
+++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
@@ -228,7 +228,14 @@ void drm_gem_shmem_put_pages_locked(struct drm_gem_shmem_object *shmem)
 }
 EXPORT_SYMBOL_GPL(drm_gem_shmem_put_pages_locked);
 
-static int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem)
+/*
+ * drm_gem_shmem_get_pages - Increase use count on the backing pages for a shmem GEM object
+ * @shmem: shmem GEM object
+ *
+ * This function Increases the use count and allocates the backing pages if
+ * use-count equals to zero.
+ */
+int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem)
 {
 	int ret;
 
@@ -241,6 +248,7 @@ static int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem)
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(drm_gem_shmem_get_pages);
 
 static int drm_gem_shmem_pin_locked(struct drm_gem_shmem_object *shmem)
 {
diff --git a/include/drm/drm_gem_shmem_helper.h b/include/drm/drm_gem_shmem_helper.h
index 18020f653d7e..6dedc0739fbc 100644
--- a/include/drm/drm_gem_shmem_helper.h
+++ b/include/drm/drm_gem_shmem_helper.h
@@ -110,6 +110,7 @@ struct drm_gem_shmem_object {
 struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t size);
 void drm_gem_shmem_free(struct drm_gem_shmem_object *shmem);
 
+int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem);
 void drm_gem_shmem_put_pages_locked(struct drm_gem_shmem_object *shmem);
 int drm_gem_shmem_pin(struct drm_gem_shmem_object *shmem);
 void drm_gem_shmem_unpin(struct drm_gem_shmem_object *shmem);
-- 
2.43.0