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authorThomas Zimmermann <tzimmermann@suse.de>2019-07-03 09:58:18 +0200
committerGerd Hoffmann <kraxel@redhat.com>2019-08-01 15:01:22 +0200
commitd9b42dfab513c9130ee0458f2e6febb75c89d1c8 (patch)
treee1bccd37044f023cf4237fe92d3f1f18989641b6 /include/drm
parent7e9e5ead55beacc11116b3fb90b0de6e7cf55a69 (diff)
downloadlinux-d9b42dfab513c9130ee0458f2e6febb75c89d1c8.tar.bz2
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/ Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'include/drm')
-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);