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drm/i915/gt: Make fence revocation unequivocal

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If we must revoke the fence because the VMA is no longer present, or
because the fence no longer applies, ensure that we do and convert it
into an error if we try but cannot.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200401210104.15907-3-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-04-01 22:01:04 +01:00
parent 725c9ee7fc
commit 0d86ee3509
4 changed files with 20 additions and 21 deletions
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21
drivers/gpu/drm/i915/gt/intel_ggtt_fencing.c
View File

@ -298,23 +298,26 @@ static int fence_update(struct i915_fence_reg *fence,
*
* This function force-removes any fence from the given object, which is useful
* if the kernel wants to do untiled GTT access.
*
* Returns:
*
* 0 on success, negative error code on failure.
*/
int i915_vma_revoke_fence(struct i915_vma *vma)
void i915_vma_revoke_fence(struct i915_vma *vma)
{
struct i915_fence_reg *fence = vma->fence;
intel_wakeref_t wakeref;
lockdep_assert_held(&vma->vm->mutex);
if (!fence)
return 0;
return;
if (atomic_read(&fence->pin_count))
return -EBUSY;
GEM_BUG_ON(fence->vma != vma);
GEM_BUG_ON(!i915_active_is_idle(&fence->active));
GEM_BUG_ON(atomic_read(&fence->pin_count));
return fence_update(fence, NULL);
fence->tiling = 0;
WRITE_ONCE(fence->vma, NULL);
vma->fence = NULL;
with_intel_runtime_pm_if_in_use(fence_to_uncore(fence)->rpm, wakeref)
fence_write(fence);
}
static struct i915_fence_reg *fence_find(struct i915_ggtt *ggtt)

14
drivers/gpu/drm/i915/i915_gem.c
View File

@ -993,18 +993,16 @@ i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
return ERR_PTR(ret);
}
if (vma->fence && !i915_gem_object_is_tiled(obj)) {
mutex_lock(&ggtt->vm.mutex);
ret = i915_vma_revoke_fence(vma);
mutex_unlock(&ggtt->vm.mutex);
if (ret)
return ERR_PTR(ret);
}
ret = i915_vma_pin(vma, size, alignment, flags | PIN_GLOBAL);
if (ret)
return ERR_PTR(ret);
if (vma->fence && !i915_gem_object_is_tiled(obj)) {
mutex_lock(&ggtt->vm.mutex);
i915_vma_revoke_fence(vma);
mutex_unlock(&ggtt->vm.mutex);
}
ret = i915_vma_wait_for_bind(vma);
if (ret) {
i915_vma_unpin(vma);

4
drivers/gpu/drm/i915/i915_vma.c
View File

@ -1298,9 +1298,7 @@ int __i915_vma_unbind(struct i915_vma *vma)
i915_vma_flush_writes(vma);
/* release the fence reg _after_ flushing */
ret = i915_vma_revoke_fence(vma);
if (ret)
return ret;
i915_vma_revoke_fence(vma);
/* Force a pagefault for domain tracking on next user access */
i915_vma_revoke_mmap(vma);

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

@ -326,7 +326,7 @@ static inline struct page *i915_vma_first_page(struct i915_vma *vma)
* True if the vma has a fence, false otherwise.
*/
int __must_check i915_vma_pin_fence(struct i915_vma *vma);
int __must_check i915_vma_revoke_fence(struct i915_vma *vma);
void i915_vma_revoke_fence(struct i915_vma *vma);
int __i915_vma_pin_fence(struct i915_vma *vma);