i915_gem_vm_close may take the lock, and we currently have no better way of handling this. At least for now, allow a path in which holding vm->mutex is sufficient. This is the case, because the object destroy path will forcefully take vm->mutex now.
Signed-off-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com --- drivers/gpu/drm/i915/i915_vma.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c index b959e904c4d3..14a301c4069f 100644 --- a/drivers/gpu/drm/i915/i915_vma.c +++ b/drivers/gpu/drm/i915/i915_vma.c @@ -40,6 +40,17 @@ #include "i915_vma.h" #include "i915_vma_resource.h"
+static inline void assert_vma_held_evict(const struct i915_vma *vma) +{ + /* + * We may be forced to unbind when the vm is dead, to clean it up. + * This is the only exception to the requirement of the object lock + * being held. + */ + if (atomic_read(&vma->vm->open)) + assert_object_held_shared(vma->obj); +} + static struct kmem_cache *slab_vmas;
static struct i915_vma *i915_vma_alloc(void) @@ -1779,7 +1790,7 @@ struct dma_fence *__i915_vma_evict(struct i915_vma *vma, bool async) struct dma_fence *unbind_fence;
GEM_BUG_ON(i915_vma_is_pinned(vma)); - assert_object_held_shared(vma->obj); + assert_vma_held_evict(vma);
if (i915_vma_is_map_and_fenceable(vma)) { /* Force a pagefault for domain tracking on next user access */ @@ -1846,7 +1857,7 @@ int __i915_vma_unbind(struct i915_vma *vma) int ret;
lockdep_assert_held(&vma->vm->mutex); - assert_object_held_shared(vma->obj); + assert_vma_held_evict(vma);
if (!drm_mm_node_allocated(&vma->node)) return 0;