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drm: Begin an API for in-kernel clients

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This the beginning of an API for in-kernel clients.
First out is a way to get a framebuffer backed by a dumb buffer.

Only GEM drivers are supported.
The original idea of using an exported dma-buf was dropped because it
also creates an anonomous file descriptor which doesn't work when the
buffer is created from a kernel thread. The easy way out is to use
drm_driver.gem_prime_vmap to get the virtual address, which requires a
GEM object. This excludes the vmwgfx driver which is the only non-GEM
driver apart from the legacy ones. A solution for vmwgfx will have to be
worked out later if it wants to support the client API which it probably
will when we have a bootsplash client.

Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180703160354.59955-2-noralf@tronnes.org
This commit is contained in:
Noralf Trønnes
2018-07-03 18:03:47 +02:00
parent 5ba57babcb
commit c76f0f7cb5
9 changed files with 572 additions and 1 deletions
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Documentation/gpu/index.rst
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@@ -10,6 +10,7 @@ Linux GPU Driver Developer's Guide
drm-kms
drm-kms-helpers
drm-uapi
drm-client
drivers
vga-switcheroo
vgaarbiter