drm/i915: Markup GEM API with lockdep asserts

Add lockdep_assert_held(struct_mutex) to the API preamble of the
internal GEM interfaces.

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/20161028125858.23563-9-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.h

@@ -3432,6 +3432,7 @@ int __must_check i915_vma_put_fence(struct i915_vma *vma);
 static inline bool
 i915_vma_pin_fence(struct i915_vma *vma)
 {
+	lockdep_assert_held(&vma->vm->dev->struct_mutex);
 	if (vma->fence) {
 		vma->fence->pin_count++;
 		return true;
@@ -3450,6 +3451,7 @@ i915_vma_pin_fence(struct i915_vma *vma)
 static inline void
 i915_vma_unpin_fence(struct i915_vma *vma)
 {
+	lockdep_assert_held(&vma->vm->dev->struct_mutex);
 	if (vma->fence) {
 		GEM_BUG_ON(vma->fence->pin_count <= 0);
 		vma->fence->pin_count--;

drivers/gpu/drm/i915/i915_gem.c

@@ -104,6 +104,8 @@ i915_gem_wait_for_error(struct i915_gpu_error *error)
 {
 	int ret;
 
+	might_sleep();
+
 	if (!i915_reset_in_progress(error))
 		return 0;
 
@@ -2333,6 +2335,8 @@ i915_gem_object_put_pages(struct drm_i915_gem_object *obj)
 {
 	const struct drm_i915_gem_object_ops *ops = obj->ops;
 
+	lockdep_assert_held(&obj->base.dev->struct_mutex);
+
 	if (obj->pages == NULL)
 		return 0;
 
@@ -2509,6 +2513,8 @@ i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
 	const struct drm_i915_gem_object_ops *ops = obj->ops;
 	int ret;
 
+	lockdep_assert_held(&obj->base.dev->struct_mutex);
+
 	if (obj->pages)
 		return 0;
 
@@ -2790,6 +2796,8 @@ void i915_gem_reset(struct drm_i915_private *dev_priv)
 	struct intel_engine_cs *engine;
 	enum intel_engine_id id;
 
+	lockdep_assert_held(&dev_priv->drm.struct_mutex);
+
 	i915_gem_retire_requests(dev_priv);
 
 	for_each_engine(engine, dev_priv, id)
@@ -3031,6 +3039,8 @@ int i915_vma_unbind(struct i915_vma *vma)
 	unsigned long active;
 	int ret;
 
+	lockdep_assert_held(&obj->base.dev->struct_mutex);
+
 	/* First wait upon any activity as retiring the request may
 	 * have side-effects such as unpinning or even unbinding this vma.
 	 */
@@ -3427,6 +3437,7 @@ i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
 	int ret;
 
 	lockdep_assert_held(&obj->base.dev->struct_mutex);
+
 	ret = i915_gem_object_wait(obj,
 				   I915_WAIT_INTERRUPTIBLE |
 				   I915_WAIT_LOCKED |
@@ -3505,6 +3516,8 @@ int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
 	struct i915_vma *vma;
 	int ret = 0;
 
+	lockdep_assert_held(&obj->base.dev->struct_mutex);
+
 	if (obj->cache_level == cache_level)
 		goto out;
 
@@ -3709,6 +3722,8 @@ i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
 	u32 old_read_domains, old_write_domain;
 	int ret;
 
+	lockdep_assert_held(&obj->base.dev->struct_mutex);
+
 	/* Mark the pin_display early so that we account for the
 	 * display coherency whilst setting up the cache domains.
 	 */
@@ -3774,6 +3789,8 @@ i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
 void
 i915_gem_object_unpin_from_display_plane(struct i915_vma *vma)
 {
+	lockdep_assert_held(&vma->vm->dev->struct_mutex);
+
 	if (WARN_ON(vma->obj->pin_display == 0))
 		return;
 
@@ -3802,6 +3819,7 @@ i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write)
 	int ret;
 
 	lockdep_assert_held(&obj->base.dev->struct_mutex);
+
 	ret = i915_gem_object_wait(obj,
 				   I915_WAIT_INTERRUPTIBLE |
 				   I915_WAIT_LOCKED |
@@ -3962,6 +3980,7 @@ int __i915_vma_do_pin(struct i915_vma *vma,
 	unsigned int bound = vma->flags;
 	int ret;
 
+	lockdep_assert_held(&vma->vm->dev->struct_mutex);
 	GEM_BUG_ON((flags & (PIN_GLOBAL | PIN_USER)) == 0);
 	GEM_BUG_ON((flags & PIN_GLOBAL) && !i915_vma_is_ggtt(vma));
 
@@ -4003,6 +4022,8 @@ i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
 	struct i915_vma *vma;
 	int ret;
 
+	lockdep_assert_held(&obj->base.dev->struct_mutex);
+
 	vma = i915_gem_obj_lookup_or_create_vma(obj, vm, view);
 	if (IS_ERR(vma))
 		return vma;

drivers/gpu/drm/i915/i915_gem_evict.c

@@ -103,6 +103,7 @@ i915_gem_evict_something(struct i915_address_space *vm,
 	struct i915_vma *vma, *next;
 	int ret;
 
+	lockdep_assert_held(&vm->dev->struct_mutex);
 	trace_i915_gem_evict(vm, min_size, alignment, flags);
 
 	/*
@@ -213,6 +214,8 @@ i915_gem_evict_for_vma(struct i915_vma *target)
 {
 	struct drm_mm_node *node, *next;
 
+	lockdep_assert_held(&target->vm->dev->struct_mutex);
+
 	list_for_each_entry_safe(node, next,
 			&target->vm->mm.head_node.node_list,
 			node_list) {
@@ -266,7 +269,7 @@ int i915_gem_evict_vm(struct i915_address_space *vm, bool do_idle)
 	struct i915_vma *vma, *next;
 	int ret;
 
-	WARN_ON(!mutex_is_locked(&vm->dev->struct_mutex));
+	lockdep_assert_held(&vm->dev->struct_mutex);
 	trace_i915_gem_evict_vm(vm);
 
 	if (do_idle) {

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -3449,6 +3449,7 @@ i915_vma_create(struct drm_i915_gem_object *obj,
 		struct i915_address_space *vm,
 		const struct i915_ggtt_view *view)
 {
+	lockdep_assert_held(&obj->base.dev->struct_mutex);
 	GEM_BUG_ON(view && !i915_is_ggtt(vm));
 	GEM_BUG_ON(i915_gem_obj_to_vma(obj, vm, view));
 
@@ -3476,6 +3477,7 @@ i915_gem_obj_lookup_or_create_vma(struct drm_i915_gem_object *obj,
 {
 	struct i915_vma *vma;
 
+	lockdep_assert_held(&obj->base.dev->struct_mutex);
 	GEM_BUG_ON(view && !i915_is_ggtt(vm));
 
 	vma = i915_gem_obj_to_vma(obj, vm, view);

drivers/gpu/drm/i915/i915_gem_render_state.c

@@ -223,6 +223,8 @@ int i915_gem_render_state_emit(struct drm_i915_gem_request *req)
 	struct intel_render_state *so;
 	int ret;
 
+	lockdep_assert_held(&req->i915->drm.struct_mutex);
+
 	so = req->engine->render_state;
 	if (!so)
 		return 0;

drivers/gpu/drm/i915/i915_gem_request.c

@@ -143,6 +143,9 @@ static void i915_gem_request_retire(struct drm_i915_gem_request *request)
 {
 	struct i915_gem_active *active, *next;
 
+	lockdep_assert_held(&request->i915->drm.struct_mutex);
+	GEM_BUG_ON(!i915_gem_request_completed(request));
+
 	trace_i915_gem_request_retire(request);
 	list_del_init(&request->link);
 
@@ -268,6 +271,8 @@ int i915_gem_set_seqno(struct drm_device *dev, u32 seqno)
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	int ret;
 
+	lockdep_assert_held(&dev_priv->drm.struct_mutex);
+
 	if (seqno == 0)
 		return -EINVAL;
 
@@ -612,6 +617,7 @@ void __i915_add_request(struct drm_i915_gem_request *request, bool flush_caches)
 	u32 reserved_tail;
 	int ret;
 
+	lockdep_assert_held(&request->i915->drm.struct_mutex);
 	trace_i915_gem_request_add(request);
 
 	/*