1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/Kconfig b/drivers/gpu/drm/radeon/Kconfig
new file mode 100644
index 000000000000..2168d67f09a6
--- /dev/null
+++ b/drivers/gpu/drm/radeon/Kconfig
@@ -0,0 +1,34 @@
+config DRM_RADEON_KMS
+        bool "Enable modesetting on radeon by default"
+        depends on DRM_RADEON
+        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).