36 lines
1.7 KiB
Plaintext
36 lines
1.7 KiB
Plaintext
config DRM_RADEON_KMS
|
|
bool "Enable modesetting on radeon by default"
|
|
depends on DRM_RADEON
|
|
select DRM_MODE_HELPER
|
|
select DRM_TTM
|
|
help
|
|
Choose this option if you want kernel modesetting enabled by default,
|
|
and you have a new enough userspace to support this. Running old
|
|
userspaces with this enabled will cause pain.
|
|
|
|
When kernel modesetting is enabled the IOCTL of radeon/drm
|
|
driver are considered as invalid and an error message is printed
|
|
in the log and they return failure.
|
|
|
|
KMS enabled userspace will use new API to talk with the radeon/drm
|
|
driver. The new API provide functions to create/destroy/share/mmap
|
|
buffer object which are then managed by the kernel memory manager
|
|
(here TTM). In order to submit command to the GPU the userspace
|
|
provide a buffer holding the command stream, along this buffer
|
|
userspace have to provide a list of buffer object used by the
|
|
command stream. The kernel radeon driver will then place buffer
|
|
in GPU accessible memory and will update command stream to reflect
|
|
the position of the different buffers.
|
|
|
|
The kernel will also perform security check on command stream
|
|
provided by the user, we want to catch and forbid any illegal use
|
|
of the GPU such as DMA into random system memory or into memory
|
|
not owned by the process supplying the command stream. This part
|
|
of the code is still incomplete and this why we propose that patch
|
|
as a staging driver addition, future security might forbid current
|
|
experimental userspace to run.
|
|
|
|
This code support the following hardware : R1XX,R2XX,R3XX,R4XX,R5XX
|
|
(radeon up to X1950). Works is underway to provide support for R6XX,
|
|
R7XX and newer hardware (radeon from HD2XXX to HD4XXX).
|