A couple patches aimed in particular at simplifying firmware debugging. The first patch adds some debugfs to dump out state, as well as a debugfs file that can be written to trigger GPU reset and firmware reloading. The second patch adds a new SUBMIT ioctl flag to allow userspace to submit cmdstream that is executed from the ringbuffer (RB) instead of from IB1. *Normally* this isn't something you want to allow userspace to do, so it is (a) restricted to CAP_SYS_ADMIN and (b) hidden behind an additional kconfig option. But it *is* quite useful for debugging since it allows you to execute a single command and then dump out the PFP and/or ME microcontroller registers/state, without having that state overwritten by handling of the return-from-CP_INDIRECT_BUFFER or other commands that the kernel normally writes into RB as part of handling of a SUBMIT. Compared to hacking up the kernel to submit different commands and dumping state, these two patches avoid much kernel rebuilding and rebooting. Also it makes it much easier to debug commands that have pointers to other GPU buffers, since it re-uses all the existing SUBMIT reloc logic. Maybe I should also add a module_param() to unlock the "sudo" flag on SUBMIT, or some other mechanism to prevent accidental use? Suggestions welcome. So far, the "sudo" flag is only supported on a5xx.. a4xx and before had different instruction sets for PFP and ME (which seem to closely match the PFP and ME instruction sets for r600), and I haven't tried to write an assembler/disassembler for those yet (and therefore haven't needed this feature). In case anyone else wants to play with this, see: https://github.com/freedreno/envytools/tree/afuc/afuc Rob Clark (2): drm/msm: add a5xx specific debugfs drm/msm: add sudo flag to submit ioctl drivers/gpu/drm/msm/Kconfig | 13 ++ drivers/gpu/drm/msm/Makefile | 2 + drivers/gpu/drm/msm/adreno/a5xx_debugfs.c | 188 +++++++++++++++++++++++++++++ drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 66 ++++++++++ drivers/gpu/drm/msm/adreno/a5xx_gpu.h | 4 + drivers/gpu/drm/msm/adreno/adreno_device.c | 6 + drivers/gpu/drm/msm/msm_debugfs.c | 5 +- drivers/gpu/drm/msm/msm_gem.h | 1 + drivers/gpu/drm/msm/msm_gem_submit.c | 9 ++ drivers/gpu/drm/msm/msm_gpu.h | 2 + include/uapi/drm/msm_drm.h | 2 + 11 files changed, 297 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/msm/adreno/a5xx_debugfs.c -- 2.13.6 _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
