Quoting Bloomfield, Jon (2019-10-07 17:55:16) > > -----Original Message----- > > From: Intel-gfx <intel-gfx-boun...@lists.freedesktop.org> On Behalf Of > > Abdiel > > Janulgue > > Sent: Monday, October 7, 2019 2:19 AM > > To: intel-gfx@lists.freedesktop.org > > Cc: Auld, Matthew <matthew.a...@intel.com> > > Subject: [Intel-gfx] [PATCH v2 3/5] drm/i915: Introduce > > DRM_I915_GEM_MMAP_OFFSET > > > > This is really just an alias of mmap_gtt. Add a new CPU mmap > > implementation that allows multiple fault handlers that depends on > > the object's backing pages. > > > > Note that we multiplex mmap_gtt and mmap_offset through the same ioctl, > > and use the zero extending behaviour of drm to differentiate between > > them, when we inspect the flags. > > > > Signed-off-by: Abdiel Janulgue <abdiel.janul...@linux.intel.com> > > Signed-off-by: Matthew Auld <matthew.a...@intel.com> > > Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com> > > --- > > drivers/gpu/drm/i915/gem/i915_gem_mman.c | 36 +++++++++++++++++-- > > .../gpu/drm/i915/gem/i915_gem_object_types.h | 3 ++ > > drivers/gpu/drm/i915/i915_drv.c | 2 +- > > include/uapi/drm/i915_drm.h | 28 +++++++++++++++ > > 4 files changed, 66 insertions(+), 3 deletions(-) > > How does the label 'offset' fit into this API if it's really about multiple > fault handlers? > Could do with a much better description here I think. Who would use this, and > why, would help a lot.
The ioctl returns the offset into the device fd userpace uses with mmap(2). Hence DRM_IOCTL_I915_GEM_MMAP_OFFSET. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
