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Date: Wed, 2 Dec 2015 11:35:35 +0000 From: Emil Velikov <emil.l.velikov@...il.com> To: Eric Anholt <eric@...olt.net> Cc: ML dri-devel <dri-devel@...ts.freedesktop.org>, "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 4/9] drm/vc4: Add an API for creating GPU shaders in GEM BOs. Hi Eric, On 1 December 2015 at 20:35, Eric Anholt <eric@...olt.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@...olt.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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