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Commit 31c7effa authored by Chris Wilson's avatar Chris Wilson
Browse files

drm/i915: Remove the vma from the drm_mm if binding fails 



As we track whether a vma has been inserted into the drm_mm using the
vma->flags, if we fail to bind the vma into the GTT we do not update
those bits and will attempt to reinsert the vma into the drm_mm on
future passes. To prevent that, we want to unwind i915_vma_insert() if
we fail in our attempt to bind.

Fixes: 59bfa124 ("drm/i915: Start passing around i915_vma from execbuffer")
Testcase: igt/drv_selftest/live_gtt
Signed-off-by: default avatarChris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: <stable@vger.kernel.org> # v4.9+
Reviewed-by: default avatarJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170227122654.27651-3-chris@chris-wilson.co.uk
parent 2f7399af

drivers/gpu/drm/i915/i915_vma.c

+37 −20
Original line number Diff line number Diff line
@@ -509,10 +509,36 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags) 
	return ret;

}



static void

i915_vma_remove(struct i915_vma *vma)

{

	struct drm_i915_gem_object *obj = vma->obj;



	GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));

	GEM_BUG_ON(vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));



	drm_mm_remove_node(&vma->node);

	list_move_tail(&vma->vm_link, &vma->vm->unbound_list);



	/* Since the unbound list is global, only move to that list if

	 * no more VMAs exist.

	 */

	if (--obj->bind_count == 0)

		list_move_tail(&obj->global_link,

			       &to_i915(obj->base.dev)->mm.unbound_list);



	/* And finally now the object is completely decoupled from this vma,

	 * we can drop its hold on the backing storage and allow it to be

	 * reaped by the shrinker.

	 */

	i915_gem_object_unpin_pages(obj);

	GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count);

}



int __i915_vma_do_pin(struct i915_vma *vma,

		      u64 size, u64 alignment, u64 flags)

{

	unsigned int bound = vma->flags;

	const unsigned int bound = vma->flags;

	int ret;



	lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
@@ -521,18 +547,18 @@ int __i915_vma_do_pin(struct i915_vma *vma, 


	if (WARN_ON(bound & I915_VMA_PIN_OVERFLOW)) {

		ret = -EBUSY;

		goto err;

		goto err_unpin;

	}



	if ((bound & I915_VMA_BIND_MASK) == 0) {

		ret = i915_vma_insert(vma, size, alignment, flags);

		if (ret)

			goto err;

			goto err_unpin;

	}



	ret = i915_vma_bind(vma, vma->obj->cache_level, flags);

	if (ret)

		goto err;

		goto err_remove;



	if ((bound ^ vma->flags) & I915_VMA_GLOBAL_BIND)

		__i915_vma_set_map_and_fenceable(vma);
@@ -541,7 +567,12 @@ int __i915_vma_do_pin(struct i915_vma *vma, 
	GEM_BUG_ON(i915_vma_misplaced(vma, size, alignment, flags));

	return 0;



err:

err_remove:

	if ((bound & I915_VMA_BIND_MASK) == 0) {

		GEM_BUG_ON(vma->pages);

		i915_vma_remove(vma);

	}

err_unpin:

	__i915_vma_unpin(vma);

	return ret;

}
@@ -654,9 +685,6 @@ int i915_vma_unbind(struct i915_vma *vma) 
	}

	vma->flags &= ~(I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND);



	drm_mm_remove_node(&vma->node);

	list_move_tail(&vma->vm_link, &vma->vm->unbound_list);



	if (vma->pages != obj->mm.pages) {

		GEM_BUG_ON(!vma->pages);

		sg_free_table(vma->pages);
@@ -664,18 +692,7 @@ int i915_vma_unbind(struct i915_vma *vma) 
	}

	vma->pages = NULL;



	/* Since the unbound list is global, only move to that list if

	 * no more VMAs exist. */

	if (--obj->bind_count == 0)

		list_move_tail(&obj->global_link,

			       &to_i915(obj->base.dev)->mm.unbound_list);



	/* And finally now the object is completely decoupled from this vma,

	 * we can drop its hold on the backing storage and allow it to be

	 * reaped by the shrinker.

	 */

	i915_gem_object_unpin_pages(obj);

	GEM_BUG_ON(atomic_read(&obj->mm.pages_pin_count) < obj->bind_count);

	i915_vma_remove(vma);



destroy:

	if (unlikely(i915_vma_is_closed(vma)))