drm/ttm: convert to unified vma offset manager

Use the new vma-manager infrastructure. This doesn't change any
implementation details as the vma-offset-manager is nearly copied 1-to-1
from TTM.

The vm_lock is moved into the offset manager so we can drop it from TTM.
During lookup, we use the vma locking helpers to take a reference to the
found object.
In all other scenarios, locking stays the same as before. We always
guarantee that drm_vma_offset_remove() is called only during destruction.
Hence, helpers like drm_vma_node_offset_addr() are always safe as long as
the node has a valid offset.

This also drops the addr_space_offset member as it is a copy of vm_start
in vma_node objects. Use the accessor functions instead.

v4:
 - remove vm_lock
 - use drm_vma_offset_lock_lookup() to protect lookup (instead of vm_lock)

Cc: Dave Airlie <airlied@redhat.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: Martin Peres <martin.peres@labri.fr>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@gmail.com>

2 files changed, 8 insertions, 17 deletions

diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 8a6aa56ece52..751eaffbf0d5 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -32,12 +32,12 @@
 #define _TTM_BO_API_H_
 
 #include <drm/drm_hashtab.h>
+#include <drm/drm_vma_manager.h>
 #include <linux/kref.h>
 #include <linux/list.h>
 #include <linux/wait.h>
 #include <linux/mutex.h>
 #include <linux/mm.h>
-#include <linux/rbtree.h>
 #include <linux/bitmap.h>
 #include <linux/reservation.h>
 
@@ -145,7 +145,6 @@ struct ttm_tt;
  * @type: The bo type.
  * @destroy: Destruction function. If NULL, kfree is used.
  * @num_pages: Actual number of pages.
- * @addr_space_offset: Address space offset.
  * @acc_size: Accounted size for this object.
  * @kref: Reference count of this buffer object. When this refcount reaches
  * zero, the object is put on the delayed delete list.
@@ -166,8 +165,7 @@ struct ttm_tt;
  * @swap: List head for swap LRU list.
  * @sync_obj: Pointer to a synchronization object.
  * @priv_flags: Flags describing buffer object internal state.
- * @vm_rb: Rb node for the vm rb tree.
- * @vm_node: Address space manager node.
+ * @vma_node: Address space manager node.
  * @offset: The current GPU offset, which can have different meanings
  * depending on the memory type. For SYSTEM type memory, it should be 0.
  * @cur_placement: Hint of current placement.
@@ -194,7 +192,6 @@ struct ttm_buffer_object {
         enum ttm_bo_type type;
         void (*destroy) (struct ttm_buffer_object *);
         unsigned long num_pages;
-        uint64_t addr_space_offset;
         size_t acc_size;
 
         /**
@@ -238,13 +235,7 @@ struct ttm_buffer_object {
         void *sync_obj;
         unsigned long priv_flags;
 
-        /**
-         * Members protected by the bdev::vm_lock
-         */
-
-        struct rb_node vm_rb;
-        struct drm_mm_node *vm_node;
-
+        struct drm_vma_offset_node vma_node;
 
         /**
          * Special members that are protected by the reserve lock
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 984fc2d571a1..8639c85d61c4 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -36,6 +36,7 @@
 #include <ttm/ttm_placement.h>
 #include <drm/drm_mm.h>
 #include <drm/drm_global.h>
+#include <drm/drm_vma_manager.h>
 #include <linux/workqueue.h>
 #include <linux/fs.h>
 #include <linux/spinlock.h>
@@ -519,7 +520,7 @@ struct ttm_bo_global {
  * @man: An array of mem_type_managers.
  * @fence_lock: Protects the synchronizing members on *all* bos belonging
  * to this device.
- * @addr_space_mm: Range manager for the device address space.
+ * @vma_manager: Address space manager
  * lru_lock: Spinlock that protects the buffer+device lru lists and
  * ddestroy lists.
  * @val_seq: Current validation sequence.
@@ -537,14 +538,13 @@ struct ttm_bo_device {
         struct list_head device_list;
         struct ttm_bo_global *glob;
         struct ttm_bo_driver *driver;
-        rwlock_t vm_lock;
         struct ttm_mem_type_manager man[TTM_NUM_MEM_TYPES];
         spinlock_t fence_lock;
+
         /*
-         * Protected by the vm lock.
+         * Protected by internal locks.
          */
-        struct rb_root addr_space_rb;
-        struct drm_mm addr_space_mm;
+        struct drm_vma_offset_manager vma_manager;
 
         /*
          * Protected by the global:lru lock.