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drm/i915: Force relocations via cpu if we run out of idle aperture

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If we run out of enough aperture space to fit the entire object, we
fallback to trying to insert a single page. However, if that also fails,
we currently fail to userspace with an unexpected ENOSPC. (ENOSPC means
to userspace that their batch could not be fitted within the GTT.) Prior
to commit e8cb909ac3 ("drm/i915: Fallback to single page GTT
mmappings for relocations") the approach is to fallback to using the
slow CPU relocation path in case of iomapping failure, and that is the
behaviour we need to restore.

Fixes: e8cb909ac3 ("drm/i915: Fallback to single page GTT mmappings...")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98101
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161007065327.24515-2-chris@chris-wilson.co.uk
(cherry picked from commit d7f7633557)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Chris Wilson 2016-10-07 07:53:25 +01:00 committed by Jani Nikula
parent 9b05a6099e
commit c92fa4fe90
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/i915_gem_execbuffer.c
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@ -451,8 +451,8 @@ static void *reloc_iomap(struct drm_i915_gem_object *obj,
0, ggtt->mappable_end,
DRM_MM_SEARCH_DEFAULT,
DRM_MM_CREATE_DEFAULT);
if (ret)
return ERR_PTR(ret);
if (ret) /* no inactive aperture space, use cpu reloc */
return NULL;
} else {
ret = i915_vma_put_fence(vma);
if (ret) {