On Wed, Mar 17, 2021 at 06:40:12PM -0500, Jason Ekstrand wrote: > From: Ashutosh Dixit <ashutosh.dixit@xxxxxxxxx> > > The rationale for this change is roughly as follows: > > 1. The functionality can be done entirely in userspace with a > combination of mmap + memcpy > > 2. The only reason anyone in userspace is still using it is because > someone implemented bo_subdata that way in libdrm ages ago and > they're all too lazy to write the 5 lines of code to do a map. > > 3. This falls cleanly into the category of things which will only get > more painful with local memory support. > > These ioctls aren't used much anymore by "real" userspace drivers. > Vulkan has never used them and neither has the iris GL driver. The old > i965 GL driver does use PWRITE for glBufferSubData but it only supports > up through Gen11; Gen12 was never enabled in i965. The compute driver > has never used PREAD/PWRITE. The only remaining user is the media > driver which uses it exactly twice and they're easily removed [1] so > expecting them to drop it going forward is reasonable. > > IGT changes which handle this kernel change have also been submitted [2]. > > [1] https://github.com/intel/media-driver/pull/1160 > [2] https://patchwork.freedesktop.org/series/81384/ > > v2 (Jason Ekstrand): > - Improved commit message with the status of all usermode drivers > - A more future-proof platform check > > v3 (Jason Ekstrand): > - Drop the HAS_LMEM checks as they're already covered by the version > checks > > Signed-off-by: Ashutosh Dixit <ashutosh.dixit@xxxxxxxxx> > Signed-off-by: Jason Ekstrand <jason@xxxxxxxxxxxxxx> > Reviewed-by: Jason Ekstrand <jason@xxxxxxxxxxxxxx> Merged the first three here. For the scheduler/context stuff I think we should go back to normal due process with kernel patch + igt patches tested together, then land igt first, then kernel, just to avoid hiccups in CI. Thanks, Daniel > --- > drivers/gpu/drm/i915/i915_gem.c | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c > index b2e3b5cfccb4a..80915467e0d84 100644 > --- a/drivers/gpu/drm/i915/i915_gem.c > +++ b/drivers/gpu/drm/i915/i915_gem.c > @@ -374,10 +374,17 @@ int > i915_gem_pread_ioctl(struct drm_device *dev, void *data, > struct drm_file *file) > { > + struct drm_i915_private *i915 = to_i915(dev); > struct drm_i915_gem_pread *args = data; > struct drm_i915_gem_object *obj; > int ret; > > + /* PREAD is disallowed for all platforms after TGL-LP. This also > + * covers all platforms with local memory. > + */ > + if (INTEL_GEN(i915) >= 12 && !IS_TIGERLAKE(i915)) > + return -EOPNOTSUPP; > + > if (args->size == 0) > return 0; > > @@ -675,10 +682,17 @@ int > i915_gem_pwrite_ioctl(struct drm_device *dev, void *data, > struct drm_file *file) > { > + struct drm_i915_private *i915 = to_i915(dev); > struct drm_i915_gem_pwrite *args = data; > struct drm_i915_gem_object *obj; > int ret; > > + /* PWRITE is disallowed for all platforms after TGL-LP. This also > + * covers all platforms with local memory. > + */ > + if (INTEL_GEN(i915) >= 12 && !IS_TIGERLAKE(i915)) > + return -EOPNOTSUPP; > + > if (args->size == 0) > return 0; > > -- > 2.29.2 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/intel-gfx -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
