diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_gem_fence_reg.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_fence_reg.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_fence_reg.c b/drivers/gpu/drm/i915/i915_gem_fence_reg.c index e03983973252..775059e19ab9 100644 --- a/drivers/gpu/drm/i915/i915_gem_fence_reg.c +++ b/drivers/gpu/drm/i915/i915_gem_fence_reg.c @@ -367,6 +367,30 @@ i915_vma_get_fence(struct i915_vma *vma) } /** + * i915_gem_revoke_fences - revoke fence state + * @dev_priv: i915 device private + * + * Removes all GTT mmappings via the fence registers. This forces any user + * of the fence to reacquire that fence before continuing with their access. + * One use is during GPU reset where the fence register is lost and we need to + * revoke concurrent userspace access via GTT mmaps until the hardware has been + * reset and the fence registers have been restored. + */ +void i915_gem_revoke_fences(struct drm_i915_private *dev_priv) +{ + int i; + + lockdep_assert_held(&dev_priv->drm.struct_mutex); + + for (i = 0; i < dev_priv->num_fence_regs; i++) { + struct drm_i915_fence_reg *fence = &dev_priv->fence_regs[i]; + + if (fence->vma) + i915_gem_release_mmap(fence->vma->obj); + } +} + +/** * i915_gem_restore_fences - restore fence state * @dev_priv: i915 device private * |