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drm/i915: Try GGTT mmapping whole object as partial

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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: aa136d9d72 ("drm/i915: Convert partial ggtt vma to full ggtt if it spans the entire object")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180630090509.469-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-06-30 10:05:09 +01:00
parent e67005e59a
commit 7e7367d3bc
2 changed files with 18 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/gpu/drm/i915/i915_gem.c
View File

@ -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);

2
drivers/gpu/drm/i915/i915_vma.c
View File

@ -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;