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drm/i915: Purge loose pages if we run out of DMA remap space

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If the DMA remap fails, one cause can be that we have too many objects
pinned in a small remapping table, such as swiotlb. (DMA remapping does
not trigger the shrinker by itself on its normal failure paths.)  So try
purging all other objects (using i915_gem_shrink_all(), sparing our own
pages as we have yet to assign them to the obj->pages) and try again. If
there are no pages to reclaim (and consequently no pages to unmap), the
shrinker will report 0 and we fail with -ENOSPC as before.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170106152240.5793-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2017-01-06 15:22:39 +00:00
parent 10466d2a59
commit 1a292fa53d
1 changed files with 18 additions and 4 deletions
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22
drivers/gpu/drm/i915/i915_gem_gtt.c
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@ -2361,10 +2361,24 @@ void i915_gem_suspend_gtt_mappings(struct drm_i915_private *dev_priv)
int i915_gem_gtt_prepare_pages(struct drm_i915_gem_object *obj,
struct sg_table *pages)
{
if (dma_map_sg(&obj->base.dev->pdev->dev,
pages->sgl, pages->nents,
PCI_DMA_BIDIRECTIONAL))
return 0;
do {
if (dma_map_sg(&obj->base.dev->pdev->dev,
pages->sgl, pages->nents,
PCI_DMA_BIDIRECTIONAL))
return 0;
/* If the DMA remap fails, one cause can be that we have
* too many objects pinned in a small remapping table,
* such as swiotlb. Incrementally purge all other objects and
* try again - if there are no more pages to remove from
* the DMA remapper, i915_gem_shrink will return 0.
*/
GEM_BUG_ON(obj->mm.pages == pages);
} while (i915_gem_shrink(to_i915(obj->base.dev),
obj->base.size >> PAGE_SHIFT,
I915_SHRINK_BOUND |
I915_SHRINK_UNBOUND |
I915_SHRINK_ACTIVE));
return -ENOSPC;
}