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drm/i915: Fix partial GGTT faulting 

We want to always use the partial VMA as a fallback for a failure to
bind the object into the GGTT. This extends the support partial objects
in the GGTT to cover everything, not just objects too large.

v2: Call the partial view, view not partial.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-23-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-08-18 17:17:02 +01:00
parent 03af84fe7f
commit a61007a83a
1 changed files with 30 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
drivers/gpu/drm/i915/i915_gem.c
View File

@ -1702,7 +1702,6 @@ int i915_gem_fault(struct vm_area_struct *area, struct vm_fault *vmf)
struct drm_device *dev = obj->base.dev;
struct drm_i915_private *dev_priv = to_i915(dev);
struct i915_ggtt *ggtt = &dev_priv->ggtt;
struct i915_ggtt_view view = i915_ggtt_view_normal;
bool write = !!(vmf->flags & FAULT_FLAG_WRITE);
struct i915_vma *vma;
pgoff_t page_offset;
@ -1736,11 +1735,14 @@ int i915_gem_fault(struct vm_area_struct *area, struct vm_fault *vmf)
goto err_unlock;
}
/* Use a partial view if the object is bigger than the aperture. */
if (obj->base.size >= ggtt->mappable_end &&
!i915_gem_object_is_tiled(obj)) {
/* Now pin it into the GTT as needed */
vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
PIN_MAPPABLE | PIN_NONBLOCK);
if (IS_ERR(vma)) {
struct i915_ggtt_view view;
unsigned int chunk_size;
/* Use a partial view if it is bigger than available space */
chunk_size = MIN_CHUNK_PAGES;
if (i915_gem_object_is_tiled(obj))
chunk_size = max(chunk_size, tile_row_pages(obj));
@ -1749,14 +1751,12 @@ int i915_gem_fault(struct vm_area_struct *area, struct vm_fault *vmf)
view.type = I915_GGTT_VIEW_PARTIAL;
view.params.partial.offset = rounddown(page_offset, chunk_size);
view.params.partial.size =
min_t(unsigned int,
chunk_size,
min_t(unsigned int, chunk_size,
(area->vm_end - area->vm_start) / PAGE_SIZE -
view.params.partial.offset);
}
/* Now pin it into the GTT if needed */
vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, PIN_MAPPABLE);
}
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
goto err_unlock;
@ -1774,26 +1774,7 @@ int i915_gem_fault(struct vm_area_struct *area, struct vm_fault *vmf)
pfn = ggtt->mappable_base + i915_ggtt_offset(vma);
pfn >>= PAGE_SHIFT;
if (unlikely(view.type == I915_GGTT_VIEW_PARTIAL)) {
/* Overriding existing pages in partial view does not cause
* us any trouble as TLBs are still valid because the fault
* is due to userspace losing part of the mapping or never
* having accessed it before (at this partials' range).
*/
unsigned long base = area->vm_start +
(view.params.partial.offset << PAGE_SHIFT);
unsigned int i;
for (i = 0; i < view.params.partial.size; i++) {
ret = vm_insert_pfn(area,
base + i * PAGE_SIZE,
pfn + i);
if (ret)
break;
}
obj->fault_mappable = true;
} else {
if (vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL) {
if (!obj->fault_mappable) {
unsigned long size =
min_t(unsigned long,
@ -1809,13 +1790,31 @@ int i915_gem_fault(struct vm_area_struct *area, struct vm_fault *vmf)
if (ret)
break;
}
obj->fault_mappable = true;
} else
ret = vm_insert_pfn(area,
(unsigned long)vmf->virtual_address,
pfn + page_offset);
} else {
/* Overriding existing pages in partial view does not cause
* us any trouble as TLBs are still valid because the fault
* is due to userspace losing part of the mapping or never
* having accessed it before (at this partials' range).
*/
const struct i915_ggtt_view *view = &vma->ggtt_view;
unsigned long base = area->vm_start +
(view->params.partial.offset << PAGE_SHIFT);
unsigned int i;
for (i = 0; i < view->params.partial.size; i++) {
ret = vm_insert_pfn(area,
base + i * PAGE_SIZE,
pfn + i);
if (ret)
break;
}
}
obj->fault_mappable = true;
err_unpin:
__i915_vma_unpin(vma);
err_unlock: