If we import a shmemfs object between devices, for example from Tigerlake to DG1, we can simply reuse the native object and its backing store.
Suggested-by: Imre Deak <[email protected]> Signed-off-by: Chris Wilson <[email protected]> Cc: Matthew Auld <[email protected]> Cc: Imre Deak <[email protected]> --- drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c index 04e9c04545ad..4816f08c4009 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c @@ -242,6 +242,13 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev, */ return &i915_gem_object_get(obj)->base; } + + /* + * If the object is in plain system memory, we can reuse the + * same backing store in any device. + */ + if (i915_gem_object_is_shmem(obj)) + return &i915_gem_object_get(obj)->base; } /* need to attach */ -- 2.20.1 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
