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drm/i915/gem: Allow backends to override pread implementation 

As there are more and more complicated interactions between the different
backing stores and userspace, push the control into the backends rather
than accumulate them all inside the ioctl handlers.

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/20201105154934.16022-1-chris@chris-wilson.co.uk
This commit is contained in:
Matthew Auld 2020-11-05 15:49:33 +00:00 committed by Chris Wilson
parent c648ae338e
commit 0049b68845
2 changed files with 8 additions and 0 deletions
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2
drivers/gpu/drm/i915/gem/i915_gem_object_types.h
View File

@ -56,6 +56,8 @@ struct drm_i915_gem_object_ops {
void (*truncate)(struct drm_i915_gem_object *obj);
void (*writeback)(struct drm_i915_gem_object *obj);
int (*pread)(struct drm_i915_gem_object *obj,
const struct drm_i915_gem_pread *arg);
int (*pwrite)(struct drm_i915_gem_object *obj,
const struct drm_i915_gem_pwrite *arg);

6
drivers/gpu/drm/i915/i915_gem.c
View File

@ -527,6 +527,12 @@ i915_gem_pread_ioctl(struct drm_device *dev, void *data,
trace_i915_gem_object_pread(obj, args->offset, args->size);
ret = -ENODEV;
if (obj->ops->pread)
ret = obj->ops->pread(obj, args);
if (ret != -ENODEV)
goto out;
ret = i915_gem_object_wait(obj,
I915_WAIT_INTERRUPTIBLE,
MAX_SCHEDULE_TIMEOUT);