drm/i915: Introduce DRM_I915_GEM_MMAP_OFFSET
authorAbdiel Janulgue <abdiel.janulgue@linux.intel.com>
Wed, 4 Dec 2019 12:00:32 +0000 (12:00 +0000)
committerChris Wilson <chris@chris-wilson.co.uk>
Wed, 4 Dec 2019 15:11:44 +0000 (15:11 +0000)
commitcc662126b4134e25fcfb6cad480de0fa95a4d3d8
treeec58b958d3a2b707a7ecf9bfbc45f4529ff7a30a
parentc415ef2a267cdfda429bb519e651c82132ef89fa
drm/i915: Introduce DRM_I915_GEM_MMAP_OFFSET

This is really just an alias of mmap_gtt. The 'mmap offset' nomenclature
comes from the value returned by this ioctl which is the offset into the
device fd which userpace uses with mmap(2).

mmap_gtt was our initial mmap_offset implementation, this extends
our CPU mmap support to allow additional 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.

To support multiple mmap types on an object we need to support multiple
mmap_offsets for an object (each offset in the global device address
space corresponding to a unique instance of the object for a file + mmap
type). As we drop the simplified drm core idea of a single mmap_offset,
we need to provide replacement hooks for the dumb mmap interface as
well.

Link: https://gitlab.freedesktop.org/mesa/mesa/merge_requests/1675
Testcase: igt/gem_mmap_offset
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191204120032.3682839-1-chris@chris-wilson.co.uk
18 files changed:
drivers/gpu/drm/i915/gem/i915_gem_domain.c
drivers/gpu/drm/i915/gem/i915_gem_ioctls.h
drivers/gpu/drm/i915/gem/i915_gem_mman.c
drivers/gpu/drm/i915/gem/i915_gem_mman.h [new file with mode: 0644]
drivers/gpu/drm/i915/gem/i915_gem_object.c
drivers/gpu/drm/i915/gem/i915_gem_object.h
drivers/gpu/drm/i915/gem/i915_gem_object_types.h
drivers/gpu/drm/i915/gem/i915_gem_pages.c
drivers/gpu/drm/i915/gem/i915_gem_tiling.c
drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
drivers/gpu/drm/i915/gt/intel_reset.c
drivers/gpu/drm/i915/i915_drv.c
drivers/gpu/drm/i915/i915_drv.h
drivers/gpu/drm/i915/i915_gem.c
drivers/gpu/drm/i915/i915_getparam.c
drivers/gpu/drm/i915/i915_vma.c
drivers/gpu/drm/i915/i915_vma.h
include/uapi/drm/i915_drm.h