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drm/i915: Fallback to single page pwrite/pread if unable to release fence

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If we cannot release the fence (for example if someone is inexplicably
trying to write into a tiled framebuffer that is currently pinned to the
display! *cough* kms_frontbuffer_tracking *cough*) fallback to using the
page-by-page pwrite/pread interface, rather than fail the syscall
entirely.

Since this is triggerable by the user (along pwrite) we have to remove
the WARN_ON(fence->pin_count).

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/20160818161718.27187-6-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-08-18 17:16:45 +01:00
parent d243ad8202
commit 1803458478
2 changed files with 19 additions and 13 deletions
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30
drivers/gpu/drm/i915/i915_gem.c
View File

@ -754,6 +754,15 @@ i915_gem_gtt_pread(struct drm_device *dev,
int ret;
vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, PIN_MAPPABLE);
if (!IS_ERR(vma)) {
node.start = i915_ggtt_offset(vma);
node.allocated = false;
ret = i915_gem_object_put_fence(obj);
if (ret) {
i915_vma_unpin(vma);
vma = ERR_PTR(ret);
}
}
if (IS_ERR(vma)) {
ret = insert_mappable_node(dev_priv, &node, PAGE_SIZE);
if (ret)
@ -766,12 +775,6 @@ i915_gem_gtt_pread(struct drm_device *dev,
}
i915_gem_object_pin_pages(obj);
} else {
node.start = i915_ggtt_offset(vma);
node.allocated = false;
ret = i915_gem_object_put_fence(obj);
if (ret)
goto out_unpin;
}
ret = i915_gem_object_set_to_gtt_domain(obj, false);
@ -1058,6 +1061,15 @@ i915_gem_gtt_pwrite_fast(struct drm_i915_private *i915,
vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
PIN_MAPPABLE | PIN_NONBLOCK);
if (!IS_ERR(vma)) {
node.start = i915_ggtt_offset(vma);
node.allocated = false;
ret = i915_gem_object_put_fence(obj);
if (ret) {
i915_vma_unpin(vma);
vma = ERR_PTR(ret);
}
}
if (IS_ERR(vma)) {
ret = insert_mappable_node(i915, &node, PAGE_SIZE);
if (ret)
@ -1070,12 +1082,6 @@ i915_gem_gtt_pwrite_fast(struct drm_i915_private *i915,
}
i915_gem_object_pin_pages(obj);
} else {
node.start = i915_ggtt_offset(vma);
node.allocated = false;
ret = i915_gem_object_put_fence(obj);
if (ret)
goto out_unpin;
}
ret = i915_gem_object_set_to_gtt_domain(obj, true);

2
drivers/gpu/drm/i915/i915_gem_fence.c
View File

@ -298,7 +298,7 @@ i915_gem_object_put_fence(struct drm_i915_gem_object *obj)
fence = &dev_priv->fence_regs[obj->fence_reg];
if (WARN_ON(fence->pin_count))
if (fence->pin_count)
return -EBUSY;
i915_gem_object_fence_lost(obj);