Hi Eric, On 1 December 2015 at 20:35, Eric Anholt <eric at anholt.net> wrote: > Since we have no MMU, the kernel needs to validate that the submitted > shader code won't make any accesses to memory that the user doesn't > control, which involves banning some operations (general purpose DMA > writes), and tracking where we need to write out pointers for other > operations (texture sampling). Once it's validated, we return a GEM > BO containing the shader, which doesn't allow mapping for write or > exporting to other subsystems. > > Signed-off-by: Eric Anholt <eric at anholt.net> > --- > drivers/gpu/drm/vc4/Makefile | 3 +- > drivers/gpu/drm/vc4/vc4_bo.c | 140 ++++++++ > drivers/gpu/drm/vc4/vc4_drv.c | 9 +- > drivers/gpu/drm/vc4/vc4_drv.h | 50 +++ > drivers/gpu/drm/vc4/vc4_qpu_defines.h | 264 +++++++++++++++
May I suggest that one 'exports' the header to something like libdrm_vc4 ? There are patches in flight for nouveau which in similar fashion, allow userspare to reuse existing api/abi. -Emil
