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- config DRM_RADEON_KMS
- bool "Enable modesetting on radeon by default"
- depends on DRM_RADEON
- select DRM_KMS_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).
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