diff options
| author | Thomas Zimmermann <tzimmermann@suse.de> | 2019-11-07 10:43:06 +0100 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2019-11-08 12:30:07 +0100 |
| commit | 08b22f65b309649057edfbae1d8772b04210b486 (patch) | |
| tree | 235cfcc142e557bfeba276b716e236714196e845 /drivers/gpu/drm/udl/Kconfig | |
| parent | 1d48b9e988a8874225e38fc1ac9967666e7eafd7 (diff) | |
drm/udl: Switch to SHMEM
Udl's GEM code and the generic SHMEM are almost identical. Replace
the former with SHMEM. The dmabuf support in udl is being replaced
with generic GEM PRIME functions.
The main difference is in the caching flags for mmap pages. By
default, SHMEM always sets (uncached) write combining. In udl's
memory management code, only imported buffers use write combining.
Memory pages of locally created buffer objects are mmap'ed with
caching enabled. To keep the optimization, udl provides its own
mmap function for GEM objects where it fixes up the mapping flags.
v3:
- restore udl vmap that enables caching
v2:
- remove obsolete code in a separate patch
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191107094307.19870-4-tzimmermann@suse.de
Diffstat (limited to 'drivers/gpu/drm/udl/Kconfig')
| -rw-r--r-- | drivers/gpu/drm/udl/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/udl/Kconfig b/drivers/gpu/drm/udl/Kconfig index b4d179b87f01..145b2a95ce58 100644 --- a/drivers/gpu/drm/udl/Kconfig +++ b/drivers/gpu/drm/udl/Kconfig @@ -5,6 +5,7 @@ config DRM_UDL depends on USB_SUPPORT depends on USB_ARCH_HAS_HCD select USB + select DRM_GEM_SHMEM_HELPER select DRM_KMS_HELPER help This is a KMS driver for the USB displaylink video adapters. |