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authorThomas Zimmermann <tzimmermann@suse.de>2019-07-03 10:58:18 +0300
committerThomas Zimmermann <tzimmermann@suse.de>2019-07-09 11:23:58 +0300
commit15dd0fc833407a513da162451ac3459650beecb6 (patch)
treea51f4cc5dac4a0a675a833d261da94da933a0824 /include/drm/drm_client.h
parent113348d86cebbf9fb07e190e6075562ee431eb15 (diff)
downloadlinux-15dd0fc833407a513da162451ac3459650beecb6.tar.xz
drm/client: Support unmapping of DRM client buffers
DRM clients, such as the fbdev emulation, have their buffer objects mapped by default. Mapping a buffer implicitly prevents its relocation. Hence, the buffer may permanently consume video memory while it's allocated. This is a problem for drivers of low-memory devices, such as ast, mgag200 or older framebuffer hardware, which will then not have enough memory to display other content (e.g., X11). This patch introduces drm_client_buffer_vmap() and _vunmap(). Internal DRM clients can use these functions to unmap and remap buffer objects as needed. There's no reference counting for vmap operations. Callers are expected to either keep buffers mapped (as it is now), or call vmap and vunmap in pairs around code that accesses the mapped memory. v2: * remove several duplicated NULL-pointer checks v3: * style and typo fixes Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Noralf Trønnes <noralf@tronnes.org> Link: https://patchwork.freedesktop.org/patch/315831/
Diffstat (limited to 'include/drm/drm_client.h')
-rw-r--r--include/drm/drm_client.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/drm/drm_client.h b/include/drm/drm_client.h
index 72d51d1e9dd9..5cf2c5dd8b1e 100644
--- a/include/drm/drm_client.h
+++ b/include/drm/drm_client.h
@@ -149,6 +149,8 @@ struct drm_client_buffer {
struct drm_client_buffer *
drm_client_framebuffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format);
void drm_client_framebuffer_delete(struct drm_client_buffer *buffer);
+void *drm_client_buffer_vmap(struct drm_client_buffer *buffer);
+void drm_client_buffer_vunmap(struct drm_client_buffer *buffer);
int drm_client_modeset_create(struct drm_client_dev *client);
void drm_client_modeset_free(struct drm_client_dev *client);