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drm/msm: add sudo flag to submit ioctl

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This flags cause cmdstream to be executed from the ringbuffer (RB)
instead of IB1.  Normally not something you'd ever want to do, but
it is super useful for firmware debugging.

Hidden behind CAP_SYS_RAWIO and a default=n kconfig option which
depends on EXPERT (and has a suitably scary warning), to prevent
it from being used on accident.

Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Rob Clark 2017-12-13 15:12:57 -05:00
commit 6a8bd08d04
5 changed files with 90 additions and 0 deletions
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2
include/uapi/drm/msm_drm.h
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@ -201,10 +201,12 @@ struct drm_msm_gem_submit_bo {
#define MSM_SUBMIT_NO_IMPLICIT 0x80000000 /* disable implicit sync */
#define MSM_SUBMIT_FENCE_FD_IN 0x40000000 /* enable input fence_fd */
#define MSM_SUBMIT_FENCE_FD_OUT 0x20000000 /* enable output fence_fd */
#define MSM_SUBMIT_SUDO 0x10000000 /* run submitted cmds from RB */
#define MSM_SUBMIT_FLAGS ( \
MSM_SUBMIT_NO_IMPLICIT | \
MSM_SUBMIT_FENCE_FD_IN | \
MSM_SUBMIT_FENCE_FD_OUT | \
MSM_SUBMIT_SUDO | \
0)
/* Each cmdstream submit consists of a table of buffers involved, and