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Commit 7e7367d3 authored by Chris Wilson's avatar Chris Wilson
Browse files

drm/i915: Try GGTT mmapping whole object as partial 

If the whole object is already pinned by HW for use as scanout, we will
fail to move it to the mappable region and so must resort to using a
partial VMA covering the whole object.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104513


Fixes: aa136d9d ("drm/i915: Convert partial ggtt vma to full ggtt if it spans the entire object")
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Reviewed-by: default avatarMatthew Auld <matthew.william.auld@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180630090509.469-1-chris@chris-wilson.co.uk
parent e67005e5

drivers/gpu/drm/i915/i915_gem.c

+17 −11
Original line number Diff line number Diff line
@@ -2006,7 +2006,6 @@ vm_fault_t i915_gem_fault(struct vm_fault *vmf) 
	bool write = !!(vmf->flags & FAULT_FLAG_WRITE);

	struct i915_vma *vma;

	pgoff_t page_offset;

	unsigned int flags;

	int ret;



	/* We don't use vmf->pgoff since that has the fake offset */
@@ -2042,27 +2041,34 @@ vm_fault_t i915_gem_fault(struct vm_fault *vmf) 
		goto err_unlock;

	}



	/* If the object is smaller than a couple of partial vma, it is

	 * not worth only creating a single partial vma - we may as well

	 * clear enough space for the full object.

	 */

	flags = PIN_MAPPABLE;

	if (obj->base.size > 2 * MIN_CHUNK_PAGES << PAGE_SHIFT)

		flags |= PIN_NONBLOCK | PIN_NONFAULT;



	/* Now pin it into the GTT as needed */

	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, flags);

	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,

				       PIN_MAPPABLE |

				       PIN_NONBLOCK |

				       PIN_NONFAULT);

	if (IS_ERR(vma)) {

		/* Use a partial view if it is bigger than available space */

		struct i915_ggtt_view view =

			compute_partial_view(obj, page_offset, MIN_CHUNK_PAGES);

		unsigned int flags;



		/* Userspace is now writing through an untracked VMA, abandon

		flags = PIN_MAPPABLE;

		if (view.type == I915_GGTT_VIEW_NORMAL)

			flags |= PIN_NONBLOCK; /* avoid warnings for pinned */



		/*

		 * Userspace is now writing through an untracked VMA, abandon

		 * all hope that the hardware is able to track future writes.

		 */

		obj->frontbuffer_ggtt_origin = ORIGIN_CPU;



		vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, PIN_MAPPABLE);

		vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, flags);

		if (IS_ERR(vma) && !view.type) {

			flags = PIN_MAPPABLE;

			view.type = I915_GGTT_VIEW_PARTIAL;

			vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, flags);

		}

	}

	if (IS_ERR(vma)) {

		ret = PTR_ERR(vma);

drivers/gpu/drm/i915/i915_vma.c

+1 −1
Original line number Diff line number Diff line
@@ -143,7 +143,7 @@ vma_create(struct drm_i915_gem_object *obj, 
						     obj->base.size >> PAGE_SHIFT));

			vma->size = view->partial.size;

			vma->size <<= PAGE_SHIFT;

			GEM_BUG_ON(vma->size >= obj->base.size);

			GEM_BUG_ON(vma->size > obj->base.size);

		} else if (view->type == I915_GGTT_VIEW_ROTATED) {

			vma->size = intel_rotation_info_size(&view->rotated);

			vma->size <<= PAGE_SHIFT;