ttm: Make parts of a struct ttm_bo_device global.

Common resources, like memory accounting and swap lists should be
global and not per device. Introduce a struct ttm_bo_global to
accomodate this, and register it with sysfs. Add a small sysfs interface
to return the number of active buffer objects.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 192 insertions, 100 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index f16909ceec93..0d0b1b7afbcf 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -45,6 +45,39 @@
 static int ttm_bo_setup_vm(struct ttm_buffer_object *bo);
 static void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo);
 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink);
+static void ttm_bo_global_kobj_release(struct kobject *kobj);
+
+static struct attribute ttm_bo_count = {
+        .name = "bo_count",
+        .mode = S_IRUGO
+};
+
+static ssize_t ttm_bo_global_show(struct kobject *kobj,
+                                  struct attribute *attr,
+                                  char *buffer)
+{
+        struct ttm_bo_global *glob =
+                container_of(kobj, struct ttm_bo_global, kobj);
+
+        return snprintf(buffer, PAGE_SIZE, "%lu\n",
+                        (unsigned long) atomic_read(&glob->bo_count));
+}
+
+static struct attribute *ttm_bo_global_attrs[] = {
+        &ttm_bo_count,
+        NULL
+};
+
+static struct sysfs_ops ttm_bo_global_ops = {
+        .show = &ttm_bo_global_show
+};
+
+static struct kobj_type ttm_bo_glob_kobj_type  = {
+        .release = &ttm_bo_global_kobj_release,
+        .sysfs_ops = &ttm_bo_global_ops,
+        .default_attrs = ttm_bo_global_attrs
+};
+
 
 static inline uint32_t ttm_bo_type_flags(unsigned type)
 {
@@ -67,10 +100,11 @@ static void ttm_bo_release_list(struct kref *list_kref)
 
         if (bo->ttm)
                 ttm_tt_destroy(bo->ttm);
+        atomic_dec(&bo->glob->bo_count);
         if (bo->destroy)
                 bo->destroy(bo);
         else {
-                ttm_mem_global_free(bdev->mem_glob, bo->acc_size);
+                ttm_mem_global_free(bdev->glob->mem_glob, bo->acc_size);
                 kfree(bo);
         }
 }
@@ -107,7 +141,7 @@ static void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
                 kref_get(&bo->list_kref);
 
                 if (bo->ttm != NULL) {
-                        list_add_tail(&bo->swap, &bdev->swap_lru);
+                        list_add_tail(&bo->swap, &bo->glob->swap_lru);
                         kref_get(&bo->list_kref);
                 }
         }
@@ -142,7 +176,7 @@ int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
                           bool interruptible,
                           bool no_wait, bool use_sequence, uint32_t sequence)
 {
-        struct ttm_bo_device *bdev = bo->bdev;
+        struct ttm_bo_global *glob = bo->glob;
         int ret;
 
         while (unlikely(atomic_cmpxchg(&bo->reserved, 0, 1) != 0)) {
@@ -154,9 +188,9 @@ int ttm_bo_reserve_locked(struct ttm_buffer_object *bo,
                 if (no_wait)
                         return -EBUSY;
 
-                spin_unlock(&bdev->lru_lock);
+                spin_unlock(&glob->lru_lock);
                 ret = ttm_bo_wait_unreserved(bo, interruptible);
-                spin_lock(&bdev->lru_lock);
+                spin_lock(&glob->lru_lock);
 
                 if (unlikely(ret))
                         return ret;
@@ -182,16 +216,16 @@ int ttm_bo_reserve(struct ttm_buffer_object *bo,
                    bool interruptible,
                    bool no_wait, bool use_sequence, uint32_t sequence)
 {
-        struct ttm_bo_device *bdev = bo->bdev;
+        struct ttm_bo_global *glob = bo->glob;
         int put_count = 0;
         int ret;
 
-        spin_lock(&bdev->lru_lock);
+        spin_lock(&glob->lru_lock);
         ret = ttm_bo_reserve_locked(bo, interruptible, no_wait, use_sequence,
                                     sequence);
         if (likely(ret == 0))
                 put_count = ttm_bo_del_from_lru(bo);
-        spin_unlock(&bdev->lru_lock);
+        spin_unlock(&glob->lru_lock);
 
         while (put_count--)
                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
@@ -201,13 +235,13 @@ int ttm_bo_reserve(struct ttm_buffer_object *bo,
 
 void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 {
-        struct ttm_bo_device *bdev = bo->bdev;
+        struct ttm_bo_global *glob = bo->glob;
 
-        spin_lock(&bdev->lru_lock);
+        spin_lock(&glob->lru_lock);
         ttm_bo_add_to_lru(bo);
         atomic_set(&bo->reserved, 0);
         wake_up_all(&bo->event_queue);
-        spin_unlock(&bdev->lru_lock);
+        spin_unlock(&glob->lru_lock);
 }
 EXPORT_SYMBOL(ttm_bo_unreserve);
 
@@ -218,6 +252,7 @@ EXPORT_SYMBOL(ttm_bo_unreserve);
 static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
 {
         struct ttm_bo_device *bdev = bo->bdev;
+        struct ttm_bo_global *glob = bo->glob;
         int ret = 0;
         uint32_t page_flags = 0;
 
@@ -230,14 +265,14 @@ static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)
                         page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
         case ttm_bo_type_kernel:
                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
-                                        page_flags, bdev->dummy_read_page);
+                                        page_flags, glob->dummy_read_page);
                 if (unlikely(bo->ttm == NULL))
                         ret = -ENOMEM;
                 break;
         case ttm_bo_type_user:
                 bo->ttm = ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,
                                         page_flags | TTM_PAGE_FLAG_USER,
-                                        bdev->dummy_read_page);
+                                        glob->dummy_read_page);
                 if (unlikely(bo->ttm == NULL))
                         ret = -ENOMEM;
                 break;
@@ -355,6 +390,7 @@ out_err:
 static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
 {
         struct ttm_bo_device *bdev = bo->bdev;
+        struct ttm_bo_global *glob = bo->glob;
         struct ttm_bo_driver *driver = bdev->driver;
         int ret;
 
@@ -366,7 +402,7 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
 
                 spin_unlock(&bo->lock);
 
-                spin_lock(&bdev->lru_lock);
+                spin_lock(&glob->lru_lock);
                 ret = ttm_bo_reserve_locked(bo, false, false, false, 0);
                 BUG_ON(ret);
                 if (bo->ttm)
@@ -381,7 +417,7 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
                         bo->mem.mm_node = NULL;
                 }
                 put_count = ttm_bo_del_from_lru(bo);
-                spin_unlock(&bdev->lru_lock);
+                spin_unlock(&glob->lru_lock);
 
                 atomic_set(&bo->reserved, 0);
 
@@ -391,14 +427,14 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
                 return 0;
         }
 
-        spin_lock(&bdev->lru_lock);
+        spin_lock(&glob->lru_lock);
         if (list_empty(&bo->ddestroy)) {
                 void *sync_obj = bo->sync_obj;
                 void *sync_obj_arg = bo->sync_obj_arg;
 
                 kref_get(&bo->list_kref);
                 list_add_tail(&bo->ddestroy, &bdev->ddestroy);
-                spin_unlock(&bdev->lru_lock);
+                spin_unlock(&glob->lru_lock);
                 spin_unlock(&bo->lock);
 
                 if (sync_obj)
@@ -408,7 +444,7 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
                 ret = 0;
 
         } else {
-                spin_unlock(&bdev->lru_lock);
+                spin_unlock(&glob->lru_lock);
                 spin_unlock(&bo->lock);
                 ret = -EBUSY;
         }
@@ -423,11 +459,12 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo, bool remove_all)
 
 static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
 {
+        struct ttm_bo_global *glob = bdev->glob;
         struct ttm_buffer_object *entry, *nentry;
         struct list_head *list, *next;
         int ret;
 
-        spin_lock(&bdev->lru_lock);
+        spin_lock(&glob->lru_lock);
         list_for_each_safe(list, next, &bdev->ddestroy) {
                 entry = list_entry(list, struct ttm_buffer_object, ddestroy);
                 nentry = NULL;
@@ -444,16 +481,16 @@ static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
                 }
                 kref_get(&entry->list_kref);
 
-                spin_unlock(&bdev->lru_lock);
+                spin_unlock(&glob->lru_lock);
                 ret = ttm_bo_cleanup_refs(entry, remove_all);
                 kref_put(&entry->list_kref, ttm_bo_release_list);
 
-                spin_lock(&bdev->lru_lock);
+                spin_lock(&glob->lru_lock);
                 if (nentry) {
                         bool next_onlist = !list_empty(next);
-                        spin_unlock(&bdev->lru_lock);
+                        spin_unlock(&glob->lru_lock);
                         kref_put(&nentry->list_kref, ttm_bo_release_list);
-                        spin_lock(&bdev->lru_lock);
+                        spin_lock(&glob->lru_lock);
                         /*
                          * Someone might have raced us and removed the
                          * next entry from the list. We don't bother restarting
@@ -467,7 +504,7 @@ static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)
                         break;
         }
         ret = !list_empty(&bdev->ddestroy);
-        spin_unlock(&bdev->lru_lock);
+        spin_unlock(&glob->lru_lock);
 
         return ret;
 }
@@ -517,6 +554,7 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo, unsigned mem_type,
 {
         int ret = 0;
         struct ttm_bo_device *bdev = bo->bdev;
+        struct ttm_bo_global *glob = bo->glob;
         struct ttm_mem_reg evict_mem;
         uint32_t proposed_placement;
 
@@ -565,12 +603,12 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo, unsigned mem_type,
                 goto out;
         }
 
-        spin_lock(&bdev->lru_lock);
+        spin_lock(&glob->lru_lock);
         if (evict_mem.mm_node) {
                 drm_mm_put_block(evict_mem.mm_node);
                 evict_mem.mm_node = NULL;
         }
-        spin_unlock(&bdev->lru_lock);
+        spin_unlock(&glob->lru_lock);
         bo->evicted = true;
 out:
         return ret;
@@ -585,6 +623,7 @@ static int ttm_bo_mem_force_space(struct ttm_bo_device *bdev,
                                   uint32_t mem_type,
                                   bool interruptible, bool no_wait)
 {
+        struct ttm_bo_global *glob = bdev->glob;
         struct drm_mm_node *node;
         struct ttm_buffer_object *entry;
         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
@@ -598,7 +637,7 @@ retry_pre_get:
         if (unlikely(ret != 0))
                 return ret;
 
-        spin_lock(&bdev->lru_lock);
+        spin_lock(&glob->lru_lock);
         do {
                 node = drm_mm_search_free(&man->manager, num_pages,
                                           mem->page_alignment, 1);
@@ -619,7 +658,7 @@ retry_pre_get:
                 if (likely(ret == 0))
                         put_count = ttm_bo_del_from_lru(entry);
 
-                spin_unlock(&bdev->lru_lock);
+                spin_unlock(&glob->lru_lock);
 
                 if (unlikely(ret != 0))
                         return ret;
@@ -635,21 +674,21 @@ retry_pre_get:
                 if (ret)
                         return ret;
 
-                spin_lock(&bdev->lru_lock);
+                spin_lock(&glob->lru_lock);
         } while (1);
 
         if (!node) {
-                spin_unlock(&bdev->lru_lock);
+                spin_unlock(&glob->lru_lock);
                 return -ENOMEM;
         }
 
         node = drm_mm_get_block_atomic(node, num_pages, mem->page_alignment);
         if (unlikely(!node)) {
-                spin_unlock(&bdev->lru_lock);
+                spin_unlock(&glob->lru_lock);
                 goto retry_pre_get;
         }
 
-        spin_unlock(&bdev->lru_lock);
+        spin_unlock(&glob->lru_lock);
         mem->mm_node = node;
         mem->mem_type = mem_type;
         return 0;
@@ -697,6 +736,7 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
                      bool interruptible, bool no_wait)
 {
         struct ttm_bo_device *bdev = bo->bdev;
+        struct ttm_bo_global *glob = bo->glob;
         struct ttm_mem_type_manager *man;
 
         uint32_t num_prios = bdev->driver->num_mem_type_prio;
@@ -733,20 +773,20 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
                                 if (unlikely(ret))
                                         return ret;
 
-                                spin_lock(&bdev->lru_lock);
+                                spin_lock(&glob->lru_lock);
                                 node = drm_mm_search_free(&man->manager,
                                                           mem->num_pages,
                                                           mem->page_alignment,
                                                           1);
                                 if (unlikely(!node)) {
-                                        spin_unlock(&bdev->lru_lock);
+                                        spin_unlock(&glob->lru_lock);
                                         break;
                                 }
                                 node = drm_mm_get_block_atomic(node,
                                                                mem->num_pages,
                                                                mem->
                                                                page_alignment);
-                                spin_unlock(&bdev->lru_lock);
+                                spin_unlock(&glob->lru_lock);
                         } while (!node);
                 }
                 if (node)
@@ -816,7 +856,7 @@ int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
                        uint32_t proposed_placement,
                        bool interruptible, bool no_wait)
 {
-        struct ttm_bo_device *bdev = bo->bdev;
+        struct ttm_bo_global *glob = bo->glob;
         int ret = 0;
         struct ttm_mem_reg mem;
 
@@ -852,9 +892,9 @@ int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 
 out_unlock:
         if (ret && mem.mm_node) {
-                spin_lock(&bdev->lru_lock);
+                spin_lock(&glob->lru_lock);
                 drm_mm_put_block(mem.mm_node);
-                spin_unlock(&bdev->lru_lock);
+                spin_unlock(&glob->lru_lock);
         }
         return ret;
 }
@@ -990,6 +1030,7 @@ int ttm_buffer_object_init(struct ttm_bo_device *bdev,
         INIT_LIST_HEAD(&bo->ddestroy);
         INIT_LIST_HEAD(&bo->swap);
         bo->bdev = bdev;
+        bo->glob = bdev->glob;
         bo->type = type;
         bo->num_pages = num_pages;
         bo->mem.mem_type = TTM_PL_SYSTEM;
@@ -1002,6 +1043,7 @@ int ttm_buffer_object_init(struct ttm_bo_device *bdev,
         bo->seq_valid = false;
         bo->persistant_swap_storage = persistant_swap_storage;
         bo->acc_size = acc_size;
+        atomic_inc(&bo->glob->bo_count);
 
         ret = ttm_bo_check_placement(bo, flags, 0ULL);
         if (unlikely(ret != 0))
@@ -1040,13 +1082,13 @@ out_err:
 }
 EXPORT_SYMBOL(ttm_buffer_object_init);
 
-static inline size_t ttm_bo_size(struct ttm_bo_device *bdev,
+static inline size_t ttm_bo_size(struct ttm_bo_global *glob,
                                  unsigned long num_pages)
 {
         size_t page_array_size = (num_pages * sizeof(void *) + PAGE_SIZE - 1) &
             PAGE_MASK;
 
-        return bdev->ttm_bo_size + 2 * page_array_size;
+        return glob->ttm_bo_size + 2 * page_array_size;
 }
 
 int ttm_buffer_object_create(struct ttm_bo_device *bdev,
@@ -1061,10 +1103,10 @@ int ttm_buffer_object_create(struct ttm_bo_device *bdev,
 {
         struct ttm_buffer_object *bo;
         int ret;
-        struct ttm_mem_global *mem_glob = bdev->mem_glob;
+        struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
 
         size_t acc_size =
-            ttm_bo_size(bdev, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
+            ttm_bo_size(bdev->glob, (size + PAGE_SIZE - 1) >> PAGE_SHIFT);
         ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
         if (unlikely(ret != 0))
                 return ret;
@@ -1118,6 +1160,7 @@ static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
                                    struct list_head *head,
                                    unsigned mem_type, bool allow_errors)
 {
+        struct ttm_bo_global *glob = bdev->glob;
         struct ttm_buffer_object *entry;
         int ret;
         int put_count;
@@ -1126,30 +1169,31 @@ static int ttm_bo_force_list_clean(struct ttm_bo_device *bdev,
          * Can't use standard list traversal since we're unlocking.
          */
 
-        spin_lock(&bdev->lru_lock);
+        spin_lock(&glob->lru_lock);
 
         while (!list_empty(head)) {
                 entry = list_first_entry(head, struct ttm_buffer_object, lru);
                 kref_get(&entry->list_kref);
                 ret = ttm_bo_reserve_locked(entry, false, false, false, 0);
                 put_count = ttm_bo_del_from_lru(entry);
-                spin_unlock(&bdev->lru_lock);
+                spin_unlock(&glob->lru_lock);
                 while (put_count--)
                         kref_put(&entry->list_kref, ttm_bo_ref_bug);
                 BUG_ON(ret);
                 ret = ttm_bo_leave_list(entry, mem_type, allow_errors);
                 ttm_bo_unreserve(entry);
                 kref_put(&entry->list_kref, ttm_bo_release_list);
-                spin_lock(&bdev->lru_lock);
+                spin_lock(&glob->lru_lock);
         }
 
-        spin_unlock(&bdev->lru_lock);
+        spin_unlock(&glob->lru_lock);
 
         return 0;
 }
 
 int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
 {
+        struct ttm_bo_global *glob = bdev->glob;
         struct ttm_mem_type_manager *man = &bdev->man[mem_type];
         int ret = -EINVAL;
 
@@ -1171,13 +1215,13 @@ int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type)
         if (mem_type > 0) {
                 ttm_bo_force_list_clean(bdev, &man->lru, mem_type, false);
 
-                spin_lock(&bdev->lru_lock);
+                spin_lock(&glob->lru_lock);
                 if (drm_mm_clean(&man->manager))
                         drm_mm_takedown(&man->manager);
                 else
                         ret = -EBUSY;
 
-                spin_unlock(&bdev->lru_lock);
+                spin_unlock(&glob->lru_lock);
         }
 
         return ret;
@@ -1251,11 +1295,83 @@ int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
 }
 EXPORT_SYMBOL(ttm_bo_init_mm);
 
+static void ttm_bo_global_kobj_release(struct kobject *kobj)
+{
+        struct ttm_bo_global *glob =
+                container_of(kobj, struct ttm_bo_global, kobj);
+
+        printk(KERN_INFO TTM_PFX "Freeing bo global.\n");
+        ttm_mem_unregister_shrink(glob->mem_glob, &glob->shrink);
+        __free_page(glob->dummy_read_page);
+        kfree(glob);
+}
+
+void ttm_bo_global_release(struct ttm_global_reference *ref)
+{
+        struct ttm_bo_global *glob = ref->object;
+
+        kobject_del(&glob->kobj);
+        kobject_put(&glob->kobj);
+}
+EXPORT_SYMBOL(ttm_bo_global_release);
+
+int ttm_bo_global_init(struct ttm_global_reference *ref)
+{
+        struct ttm_bo_global_ref *bo_ref =
+                container_of(ref, struct ttm_bo_global_ref, ref);
+        struct ttm_bo_global *glob = ref->object;
+        int ret;
+
+        mutex_init(&glob->device_list_mutex);
+        spin_lock_init(&glob->lru_lock);
+        glob->mem_glob = bo_ref->mem_glob;
+        glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
+
+        if (unlikely(glob->dummy_read_page == NULL)) {
+                ret = -ENOMEM;
+                goto out_no_drp;
+        }
+
+        INIT_LIST_HEAD(&glob->swap_lru);
+        INIT_LIST_HEAD(&glob->device_list);
+
+        ttm_mem_init_shrink(&glob->shrink, ttm_bo_swapout);
+        ret = ttm_mem_register_shrink(glob->mem_glob, &glob->shrink);
+        if (unlikely(ret != 0)) {
+                printk(KERN_ERR TTM_PFX
+                       "Could not register buffer object swapout.\n");
+                goto out_no_shrink;
+        }
+
+        glob->ttm_bo_extra_size =
+                ttm_round_pot(sizeof(struct ttm_tt)) +
+                ttm_round_pot(sizeof(struct ttm_backend));
+
+        glob->ttm_bo_size = glob->ttm_bo_extra_size +
+                ttm_round_pot(sizeof(struct ttm_buffer_object));
+
+        atomic_set(&glob->bo_count, 0);
+
+        kobject_init(&glob->kobj, &ttm_bo_glob_kobj_type);
+        ret = kobject_add(&glob->kobj, ttm_get_kobj(), "buffer_objects");
+        if (unlikely(ret != 0))
+                kobject_put(&glob->kobj);
+        return ret;
+out_no_shrink:
+        __free_page(glob->dummy_read_page);
+out_no_drp:
+        kfree(glob);
+        return ret;
+}
+EXPORT_SYMBOL(ttm_bo_global_init);
+
+
 int ttm_bo_device_release(struct ttm_bo_device *bdev)
 {
         int ret = 0;
         unsigned i = TTM_NUM_MEM_TYPES;
         struct ttm_mem_type_manager *man;
+        struct ttm_bo_global *glob = bdev->glob;
 
         while (i--) {
                 man = &bdev->man[i];
@@ -1271,98 +1387,74 @@ int ttm_bo_device_release(struct ttm_bo_device *bdev)
                 }
         }
 
+        mutex_lock(&glob->device_list_mutex);
+        list_del(&bdev->device_list);
+        mutex_unlock(&glob->device_list_mutex);
+
         if (!cancel_delayed_work(&bdev->wq))
                 flush_scheduled_work();
 
         while (ttm_bo_delayed_delete(bdev, true))
                 ;
 
-        spin_lock(&bdev->lru_lock);
+        spin_lock(&glob->lru_lock);
         if (list_empty(&bdev->ddestroy))
                 TTM_DEBUG("Delayed destroy list was clean\n");
 
         if (list_empty(&bdev->man[0].lru))
                 TTM_DEBUG("Swap list was clean\n");
-        spin_unlock(&bdev->lru_lock);
+        spin_unlock(&glob->lru_lock);
 
-        ttm_mem_unregister_shrink(bdev->mem_glob, &bdev->shrink);
         BUG_ON(!drm_mm_clean(&bdev->addr_space_mm));
         write_lock(&bdev->vm_lock);
         drm_mm_takedown(&bdev->addr_space_mm);
         write_unlock(&bdev->vm_lock);
 
-        __free_page(bdev->dummy_read_page);
         return ret;
 }
 EXPORT_SYMBOL(ttm_bo_device_release);
 
-/*
- * This function is intended to be called on drm driver load.
- * If you decide to call it from firstopen, you must protect the call
- * from a potentially racing ttm_bo_driver_finish in lastclose.
- * (This may happen on X server restart).
- */
-
 int ttm_bo_device_init(struct ttm_bo_device *bdev,
-                       struct ttm_mem_global *mem_glob,
-                       struct ttm_bo_driver *driver, uint64_t file_page_offset)
+                       struct ttm_bo_global *glob,
+                       struct ttm_bo_driver *driver,
+                       uint64_t file_page_offset)
 {
         int ret = -EINVAL;
 
-        bdev->dummy_read_page = NULL;
         rwlock_init(&bdev->vm_lock);
-        spin_lock_init(&bdev->lru_lock);
+        spin_lock_init(&glob->lru_lock);
 
         bdev->driver = driver;
-        bdev->mem_glob = mem_glob;
 
         memset(bdev->man, 0, sizeof(bdev->man));
 
-        bdev->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
-        if (unlikely(bdev->dummy_read_page == NULL)) {
-                ret = -ENOMEM;
-                goto out_err0;
-        }
-
         /*
          * Initialize the system memory buffer type.
          * Other types need to be driver / IOCTL initialized.
          */
         ret = ttm_bo_init_mm(bdev, TTM_PL_SYSTEM, 0, 0);
         if (unlikely(ret != 0))
-                goto out_err1;
+                goto out_no_sys;
 
         bdev->addr_space_rb = RB_ROOT;
         ret = drm_mm_init(&bdev->addr_space_mm, file_page_offset, 0x10000000);
         if (unlikely(ret != 0))
-                goto out_err2;
+                goto out_no_addr_mm;
 
         INIT_DELAYED_WORK(&bdev->wq, ttm_bo_delayed_workqueue);
         bdev->nice_mode = true;
         INIT_LIST_HEAD(&bdev->ddestroy);
-        INIT_LIST_HEAD(&bdev->swap_lru);
         bdev->dev_mapping = NULL;
-        ttm_mem_init_shrink(&bdev->shrink, ttm_bo_swapout);
-        ret = ttm_mem_register_shrink(mem_glob, &bdev->shrink);
-        if (unlikely(ret != 0)) {
-                printk(KERN_ERR TTM_PFX
-                       "Could not register buffer object swapout.\n");
-                goto out_err2;
-        }
+        bdev->glob = glob;
 
-        bdev->ttm_bo_extra_size =
-                ttm_round_pot(sizeof(struct ttm_tt)) +
-                ttm_round_pot(sizeof(struct ttm_backend));
-
-        bdev->ttm_bo_size = bdev->ttm_bo_extra_size +
-                ttm_round_pot(sizeof(struct ttm_buffer_object));
+        mutex_lock(&glob->device_list_mutex);
+        list_add_tail(&bdev->device_list, &glob->device_list);
+        mutex_unlock(&glob->device_list_mutex);
 
         return 0;
-out_err2:
+out_no_addr_mm:
         ttm_bo_clean_mm(bdev, 0);
-out_err1:
-        __free_page(bdev->dummy_read_page);
-out_err0:
+out_no_sys:
         return ret;
 }
 EXPORT_SYMBOL(ttm_bo_device_init);
@@ -1607,21 +1699,21 @@ void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo)
 
 static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
 {
-        struct ttm_bo_device *bdev =
-            container_of(shrink, struct ttm_bo_device, shrink);
+        struct ttm_bo_global *glob =
+            container_of(shrink, struct ttm_bo_global, shrink);
         struct ttm_buffer_object *bo;
         int ret = -EBUSY;
         int put_count;
         uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);
 
-        spin_lock(&bdev->lru_lock);
+        spin_lock(&glob->lru_lock);
         while (ret == -EBUSY) {
-                if (unlikely(list_empty(&bdev->swap_lru))) {
-                        spin_unlock(&bdev->lru_lock);
+                if (unlikely(list_empty(&glob->swap_lru))) {
+                        spin_unlock(&glob->lru_lock);
                         return -EBUSY;
                 }
 
-                bo = list_first_entry(&bdev->swap_lru,
+                bo = list_first_entry(&glob->swap_lru,
                                       struct ttm_buffer_object, swap);
                 kref_get(&bo->list_kref);
 
@@ -1633,16 +1725,16 @@ static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
 
                 ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
                 if (unlikely(ret == -EBUSY)) {
-                        spin_unlock(&bdev->lru_lock);
+                        spin_unlock(&glob->lru_lock);
                         ttm_bo_wait_unreserved(bo, false);
                         kref_put(&bo->list_kref, ttm_bo_release_list);
-                        spin_lock(&bdev->lru_lock);
+                        spin_lock(&glob->lru_lock);
                 }
         }
 
         BUG_ON(ret != 0);
         put_count = ttm_bo_del_from_lru(bo);
-        spin_unlock(&bdev->lru_lock);
+        spin_unlock(&glob->lru_lock);
 
         while (put_count--)
                 kref_put(&bo->list_kref, ttm_bo_ref_bug);
@@ -1696,6 +1788,6 @@ out:
 
 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
 {
-        while (ttm_bo_swapout(&bdev->shrink) == 0)
+        while (ttm_bo_swapout(&bdev->glob->shrink) == 0)
                 ;
 }