drm/i915: mm_list is per VMA

formerly: "drm/i915: Create VMAs (part 5) - move mm_list"

The mm_list is used for the active/inactive LRUs. Since those LRUs are
per address space, the link should be per VMx .

Because we'll only ever have 1 VMA before this point, it's not incorrect
to defer this change until this point in the patch series, and doing it
here makes the change much easier to understand.

Shamelessly manipulated out of Daniel:
"active/inactive stuff is used by eviction when we run out of address
space, so needs to be per-vma and per-address space. Bound/unbound otoh
is used by the shrinker which only cares about the amount of memory used
and not one bit about in which address space this memory is all used in.
Of course to actual kick out an object we need to unbind it from every
address space, but for that we have the per-object list of vmas."

v2: only bump GGTT LRU in i915_gem_object_set_to_gtt_domain (Chris)

v3: Moved earlier in the series

v4: Add dropped message from v3
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
[danvet: Frob patch to apply and use vma->node.size directly as
discused with Ben. Also drop a needles BUG_ON before move_to_inactive,
the function itself has the same check.]
[danvet 2nd: Rebase on top of the lost "drm/i915: Cleanup more of VMA
in destroy", specifically unlink the vma from the mm_list in
vma_unbind (to keep it symmetric with bind_to_vm) instead of
vma_destroy.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -149,7 +149,7 @@ static int i915_gem_object_list_info(struct seq_file *m, void *data)
 	struct drm_device *dev = node->minor->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct i915_address_space *vm = &dev_priv->gtt.base;
-	struct drm_i915_gem_object *obj;
+	struct i915_vma *vma;
 	size_t total_obj_size, total_gtt_size;
 	int count, ret;
 
@@ -157,6 +157,7 @@ static int i915_gem_object_list_info(struct seq_file *m, void *data)
 	if (ret)
 		return ret;
 
+	/* FIXME: the user of this interface might want more than just GGTT */
 	switch (list) {
 	case ACTIVE_LIST:
 		seq_puts(m, "Active:\n");
@@ -172,12 +173,12 @@ static int i915_gem_object_list_info(struct seq_file *m, void *data)
 	}
 
 	total_obj_size = total_gtt_size = count = 0;
-	list_for_each_entry(obj, head, mm_list) {
-		seq_puts(m, "   ");
-		describe_obj(m, obj);
-		seq_putc(m, '\n');
-		total_obj_size += obj->base.size;
-		total_gtt_size += i915_gem_obj_ggtt_size(obj);
+	list_for_each_entry(vma, head, mm_list) {
+		seq_printf(m, "   ");
+		describe_obj(m, vma->obj);
+		seq_printf(m, "\n");
+		total_obj_size += vma->obj->base.size;
+		total_gtt_size += vma->node.size;
 		count++;
 	}
 	mutex_unlock(&dev->struct_mutex);
@@ -224,7 +225,18 @@ static int per_file_stats(int id, void *ptr, void *data)
 	return 0;
 }
 
-static int i915_gem_object_info(struct seq_file *m, void *data)
+#define count_vmas(list, member) do { \
+	list_for_each_entry(vma, list, member) { \
+		size += i915_gem_obj_ggtt_size(vma->obj); \
+		++count; \
+		if (vma->obj->map_and_fenceable) { \
+			mappable_size += i915_gem_obj_ggtt_size(vma->obj); \
+			++mappable_count; \
+		} \
+	} \
+} while (0)
+
+static int i915_gem_object_info(struct seq_file *m, void* data)
 {
 	struct drm_info_node *node = (struct drm_info_node *) m->private;
 	struct drm_device *dev = node->minor->dev;
@@ -234,6 +246,7 @@ static int i915_gem_object_info(struct seq_file *m, void *data)
 	struct drm_i915_gem_object *obj;
 	struct i915_address_space *vm = &dev_priv->gtt.base;
 	struct drm_file *file;
+	struct i915_vma *vma;
 	int ret;
 
 	ret = mutex_lock_interruptible(&dev->struct_mutex);
@@ -250,12 +263,12 @@ static int i915_gem_object_info(struct seq_file *m, void *data)
 		   count, mappable_count, size, mappable_size);
 
 	size = count = mappable_size = mappable_count = 0;
-	count_objects(&vm->active_list, mm_list);
+	count_vmas(&vm->active_list, mm_list);
 	seq_printf(m, "  %u [%u] active objects, %zu [%zu] bytes\n",
 		   count, mappable_count, size, mappable_size);
 
 	size = count = mappable_size = mappable_count = 0;
-	count_objects(&vm->inactive_list, mm_list);
+	count_vmas(&vm->inactive_list, mm_list);
 	seq_printf(m, "  %u [%u] inactive objects, %zu [%zu] bytes\n",
 		   count, mappable_count, size, mappable_size);
 
@@ -1774,7 +1787,8 @@ i915_drop_caches_set(void *data, u64 val)
 	struct drm_device *dev = data;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_i915_gem_object *obj, *next;
-	struct i915_address_space *vm = &dev_priv->gtt.base;
+	struct i915_address_space *vm;
+	struct i915_vma *vma, *x;
 	int ret;
 
 	DRM_DEBUG_DRIVER("Dropping caches: 0x%08llx\n", val);
@@ -1795,16 +1809,18 @@ i915_drop_caches_set(void *data, u64 val)
 		i915_gem_retire_requests(dev);
 
 	if (val & DROP_BOUND) {
-		list_for_each_entry_safe(obj, next, &vm->inactive_list,
+		list_for_each_entry(vm, &dev_priv->vm_list, global_link) {
+			list_for_each_entry_safe(vma, x, &vm->inactive_list,
 						 mm_list) {
-			if (obj->pin_count)
+				if (vma->obj->pin_count)
 					continue;
 
-			ret = i915_gem_object_ggtt_unbind(obj);
+				ret = i915_vma_unbind(vma);
 				if (ret)
 					goto unlock;
 			}
 		}
+	}
 
 	if (val & DROP_UNBOUND) {
 		list_for_each_entry_safe(obj, next, &dev_priv->mm.unbound_list,

drivers/gpu/drm/i915/i915_drv.h

@@ -558,6 +558,9 @@ struct i915_vma {
 	struct drm_i915_gem_object *obj;
 	struct i915_address_space *vm;
 
+	/** This object's place on the active/inactive lists */
+	struct list_head mm_list;
+
 	struct list_head vma_link; /* Link in the object's VMA list */
 };
 
@@ -1299,9 +1302,7 @@ struct drm_i915_gem_object {
 	struct drm_mm_node *stolen;
 	struct list_head global_list;
 
-	/** This object's place on the active/inactive lists */
 	struct list_head ring_list;
-	struct list_head mm_list;
 	/** This object's place in the batchbuffer or on the eviction list */
 	struct list_head exec_list;
 

drivers/gpu/drm/i915/i915_gem.c

@@ -1886,7 +1886,6 @@ i915_gem_object_move_to_active(struct drm_i915_gem_object *obj,
 {
 	struct drm_device *dev = obj->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct i915_address_space *vm = &dev_priv->gtt.base;
 	u32 seqno = intel_ring_get_seqno(ring);
 
 	BUG_ON(ring == NULL);
@@ -1902,8 +1901,6 @@ i915_gem_object_move_to_active(struct drm_i915_gem_object *obj,
 		obj->active = 1;
 	}
 
-	/* Move from whatever list we were on to the tail of execution. */
-	list_move_tail(&obj->mm_list, &vm->active_list);
 	list_move_tail(&obj->ring_list, &ring->active_list);
 
 	obj->last_read_seqno = seqno;
@@ -1925,14 +1922,14 @@ i915_gem_object_move_to_active(struct drm_i915_gem_object *obj,
 static void
 i915_gem_object_move_to_inactive(struct drm_i915_gem_object *obj)
 {
-	struct drm_device *dev = obj->base.dev;
-	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct i915_address_space *vm = &dev_priv->gtt.base;
+	struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
+	struct i915_address_space *ggtt_vm = &dev_priv->gtt.base;
+	struct i915_vma *vma = i915_gem_obj_to_vma(obj, ggtt_vm);
 
 	BUG_ON(obj->base.write_domain & ~I915_GEM_GPU_DOMAINS);
 	BUG_ON(!obj->active);
 
-	list_move_tail(&obj->mm_list, &vm->inactive_list);
+	list_move_tail(&vma->mm_list, &ggtt_vm->inactive_list);
 
 	list_del_init(&obj->ring_list);
 	obj->ring = NULL;
@@ -2640,7 +2637,7 @@ int i915_vma_unbind(struct i915_vma *vma)
 	i915_gem_gtt_finish_object(obj);
 	i915_gem_object_unpin_pages(obj);
 
-	list_del(&obj->mm_list);
+	list_del(&vma->mm_list);
 	/* Avoid an unnecessary call to unbind on rebind. */
 	if (i915_is_ggtt(vma->vm))
 		obj->map_and_fenceable = true;
@@ -3187,7 +3184,7 @@ i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj,
 		goto err_remove_node;
 
 	list_move_tail(&obj->global_list, &dev_priv->mm.bound_list);
-	list_add_tail(&obj->mm_list, &vm->inactive_list);
+	list_add_tail(&vma->mm_list, &vm->inactive_list);
 
 	/* Keep GGTT vmas first to make debug easier */
 	if (i915_is_ggtt(vm))
@@ -3352,10 +3349,15 @@ i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
 					    old_write_domain);
 
 	/* And bump the LRU for this access */
-	if (i915_gem_object_is_inactive(obj))
-		list_move_tail(&obj->mm_list,
+	if (i915_gem_object_is_inactive(obj)) {
+		struct i915_vma *vma = i915_gem_obj_to_vma(obj,
+							   &dev_priv->gtt.base);
+		if (vma)
+			list_move_tail(&vma->mm_list,
 				       &dev_priv->gtt.base.inactive_list);
 
+	}
+
 	return 0;
 }
 
@@ -3927,7 +3929,6 @@ i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
 void i915_gem_object_init(struct drm_i915_gem_object *obj,
 			  const struct drm_i915_gem_object_ops *ops)
 {
-	INIT_LIST_HEAD(&obj->mm_list);
 	INIT_LIST_HEAD(&obj->global_list);
 	INIT_LIST_HEAD(&obj->ring_list);
 	INIT_LIST_HEAD(&obj->exec_list);
@@ -4069,6 +4070,7 @@ struct i915_vma *i915_gem_vma_create(struct drm_i915_gem_object *obj,
 		return ERR_PTR(-ENOMEM);
 
 	INIT_LIST_HEAD(&vma->vma_link);
+	INIT_LIST_HEAD(&vma->mm_list);
 	vma->vm = vm;
 	vma->obj = obj;
 

drivers/gpu/drm/i915/i915_gem_context.c

@@ -436,7 +436,10 @@ static int do_switch(struct i915_hw_context *to)
 	 * MI_SET_CONTEXT instead of when the next seqno has completed.
 	 */
 	if (from != NULL) {
+		struct drm_i915_private *dev_priv = from->obj->base.dev->dev_private;
+		struct i915_address_space *ggtt = &dev_priv->gtt.base;
 		from->obj->base.read_domains = I915_GEM_DOMAIN_INSTRUCTION;
+		list_move_tail(&i915_gem_obj_to_vma(from->obj, ggtt)->mm_list, &ggtt->active_list);
 		i915_gem_object_move_to_active(from->obj, ring);
 		/* As long as MI_SET_CONTEXT is serializing, ie. it flushes the
 		 * whole damn pipeline, we don't need to explicitly mark the

drivers/gpu/drm/i915/i915_gem_evict.c

@@ -87,8 +87,7 @@ i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm,
 		drm_mm_init_scan(&vm->mm, min_size, alignment, cache_level);
 
 	/* First see if there is a large enough contiguous idle region... */
-	list_for_each_entry(obj, &vm->inactive_list, mm_list) {
-		struct i915_vma *vma = i915_gem_obj_to_vma(obj, vm);
+	list_for_each_entry(vma, &vm->inactive_list, mm_list) {
 		if (mark_free(vma, &unwind_list))
 			goto found;
 	}
@@ -97,8 +96,7 @@ i915_gem_evict_something(struct drm_device *dev, struct i915_address_space *vm,
 		goto none;
 
 	/* Now merge in the soon-to-be-expired objects... */
-	list_for_each_entry(obj, &vm->active_list, mm_list) {
-		struct i915_vma *vma = i915_gem_obj_to_vma(obj, vm);
+	list_for_each_entry(vma, &vm->active_list, mm_list) {
 		if (mark_free(vma, &unwind_list))
 			goto found;
 	}
@@ -159,7 +157,7 @@ i915_gem_evict_everything(struct drm_device *dev)
 {
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	struct i915_address_space *vm;
-	struct drm_i915_gem_object *obj, *next;
+	struct i915_vma *vma, *next;
 	bool lists_empty = true;
 	int ret;
 
@@ -187,9 +185,9 @@ i915_gem_evict_everything(struct drm_device *dev)
 
 	/* Having flushed everything, unbind() should never raise an error */
 	list_for_each_entry(vm, &dev_priv->vm_list, global_link) {
-		list_for_each_entry_safe(obj, next, &vm->inactive_list, mm_list)
-			if (obj->pin_count == 0)
-				WARN_ON(i915_vma_unbind(i915_gem_obj_to_vma(obj, vm)));
+		list_for_each_entry_safe(vma, next, &vm->inactive_list, mm_list)
+			if (vma->obj->pin_count == 0)
+				WARN_ON(i915_vma_unbind(vma));
 	}
 
 	return 0;

drivers/gpu/drm/i915/i915_gem_execbuffer.c

@@ -801,6 +801,8 @@ i915_gem_execbuffer_move_to_active(struct list_head *objects,
 		obj->base.read_domains = obj->base.pending_read_domains;
 		obj->fenced_gpu_access = obj->pending_fenced_gpu_access;
 
+		/* FIXME: This lookup gets fixed later <-- danvet */
+		list_move_tail(&i915_gem_obj_to_vma(obj, vm)->mm_list, &vm->active_list);
 		i915_gem_object_move_to_active(obj, ring);
 		if (obj->base.write_domain) {
 			obj->dirty = 1;

drivers/gpu/drm/i915/i915_gem_stolen.c

@@ -401,7 +401,7 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_device *dev,
 	obj->has_global_gtt_mapping = 1;
 
 	list_add_tail(&obj->global_list, &dev_priv->mm.bound_list);
-	list_add_tail(&obj->mm_list, &ggtt->inactive_list);
+	list_add_tail(&vma->mm_list, &ggtt->inactive_list);
 
 	return obj;
 

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -556,11 +556,11 @@ static void capture_bo(struct drm_i915_error_buffer *err,
 static u32 capture_active_bo(struct drm_i915_error_buffer *err,
 			     int count, struct list_head *head)
 {
-	struct drm_i915_gem_object *obj;
+	struct i915_vma *vma;
 	int i = 0;
 
-	list_for_each_entry(obj, head, mm_list) {
-		capture_bo(err++, obj);
+	list_for_each_entry(vma, head, mm_list) {
+		capture_bo(err++, vma->obj);
 		if (++i == count)
 			break;
 	}
@@ -622,7 +622,8 @@ static struct drm_i915_error_object *
 i915_error_first_batchbuffer(struct drm_i915_private *dev_priv,
 			     struct intel_ring_buffer *ring)
 {
-	struct i915_address_space *vm = &dev_priv->gtt.base;
+	struct i915_address_space *vm;
+	struct i915_vma *vma;
 	struct drm_i915_gem_object *obj;
 	u32 seqno;
 
@@ -642,7 +643,9 @@ i915_error_first_batchbuffer(struct drm_i915_private *dev_priv,
 	}
 
 	seqno = ring->get_seqno(ring, false);
-	list_for_each_entry(obj, &vm->active_list, mm_list) {
+	list_for_each_entry(vm, &dev_priv->vm_list, global_link) {
+		list_for_each_entry(vma, &vm->active_list, mm_list) {
+			obj = vma->obj;
 			if (obj->ring != ring)
 				continue;
 
@@ -657,6 +660,7 @@ i915_error_first_batchbuffer(struct drm_i915_private *dev_priv,
 			 */
 			return i915_error_object_create(dev_priv, obj);
 		}
+	}
 
 	return NULL;
 }
@@ -775,11 +779,12 @@ static void i915_gem_capture_buffers(struct drm_i915_private *dev_priv,
 				     struct drm_i915_error_state *error)
 {
 	struct i915_address_space *vm = &dev_priv->gtt.base;
+	struct i915_vma *vma;
 	struct drm_i915_gem_object *obj;
 	int i;
 
 	i = 0;
-	list_for_each_entry(obj, &vm->active_list, mm_list)
+	list_for_each_entry(vma, &vm->active_list, mm_list)
 		i++;
 	error->active_bo_count = i;
 	list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list)