drm/ttm: device naming cleanup

Rename ttm_bo_device to ttm_device.
Rename ttm_bo_driver to ttm_device_funcs.
Rename ttm_bo_global to ttm_global.

Move global and device related functions to ttm_device.[ch].

No functional change.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/415222/

5 files changed, 352 insertions, 344 deletions

diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index e17be324d95f..62734db0b421 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -44,9 +44,9 @@
 
 #include "ttm_resource.h"
 
-struct ttm_bo_global;
+struct ttm_global;
 
-struct ttm_bo_device;
+struct ttm_device;
 
 struct dma_buf_map;
 
@@ -122,7 +122,7 @@ struct ttm_buffer_object {
 	 * Members constant at init.
 	 */
 
-	struct ttm_bo_device *bdev;
+	struct ttm_device *bdev;
 	enum ttm_bo_type type;
 	void (*destroy) (struct ttm_buffer_object *);
 	size_t acc_size;
@@ -313,7 +313,7 @@ void ttm_bo_put(struct ttm_buffer_object *bo);
  * @bulk: optional bulk move structure to remember BO positions
  *
  * Move this BO to the tail of all lru lists used to lookup and reserve an
- * object. This function must be called with struct ttm_bo_global::lru_lock
+ * object. This function must be called with struct ttm_global::lru_lock
  * held, and is used to make a BO less likely to be considered for eviction.
  */
 void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
@@ -326,7 +326,7 @@ void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
  * @bulk: bulk move structure
  *
  * Bulk move BOs to the LRU tail, only valid to use when driver makes sure that
- * BO order never changes. Should be called with ttm_bo_global::lru_lock held.
+ * BO order never changes. Should be called with ttm_global::lru_lock held.
  */
 void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk);
 
@@ -337,14 +337,14 @@ void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk);
  * Returns
  * True if the workqueue was queued at the time
  */
-int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev);
+int ttm_bo_lock_delayed_workqueue(struct ttm_device *bdev);
 
 /**
  * ttm_bo_unlock_delayed_workqueue
  *
  * Allows the delayed workqueue to run.
  */
-void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched);
+void ttm_bo_unlock_delayed_workqueue(struct ttm_device *bdev, int resched);
 
 /**
  * ttm_bo_eviction_valuable
@@ -357,14 +357,14 @@ void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched);
 bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
 			      const struct ttm_place *place);
 
-size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
+size_t ttm_bo_dma_acc_size(struct ttm_device *bdev,
 			   unsigned long bo_size,
 			   unsigned struct_size);
 
 /**
  * ttm_bo_init_reserved
  *
- * @bdev: Pointer to a ttm_bo_device struct.
+ * @bdev: Pointer to a ttm_device struct.
  * @bo: Pointer to a ttm_buffer_object to be initialized.
  * @size: Requested size of buffer object.
  * @type: Requested type of buffer object.
@@ -396,7 +396,7 @@ size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
  * -ERESTARTSYS: Interrupted by signal while sleeping waiting for resources.
  */
 
-int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
+int ttm_bo_init_reserved(struct ttm_device *bdev,
 			 struct ttm_buffer_object *bo,
 			 size_t size, enum ttm_bo_type type,
 			 struct ttm_placement *placement,
@@ -409,7 +409,7 @@ int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
 /**
  * ttm_bo_init
  *
- * @bdev: Pointer to a ttm_bo_device struct.
+ * @bdev: Pointer to a ttm_device struct.
  * @bo: Pointer to a ttm_buffer_object to be initialized.
  * @size: Requested size of buffer object.
  * @type: Requested type of buffer object.
@@ -443,7 +443,7 @@ int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
  * -EINVAL: Invalid placement flags.
  * -ERESTARTSYS: Interrupted by signal while sleeping waiting for resources.
  */
-int ttm_bo_init(struct ttm_bo_device *bdev, struct ttm_buffer_object *bo,
+int ttm_bo_init(struct ttm_device *bdev, struct ttm_buffer_object *bo,
 		size_t size, enum ttm_bo_type type,
 		struct ttm_placement *placement,
 		uint32_t page_alignment, bool interrubtible, size_t acc_size,
@@ -537,18 +537,18 @@ int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo);
  *
  * @filp:      filp as input from the mmap method.
  * @vma:       vma as input from the mmap method.
- * @bdev:      Pointer to the ttm_bo_device with the address space manager.
+ * @bdev:      Pointer to the ttm_device with the address space manager.
  *
  * This function is intended to be called by the device mmap method.
  * if the device address space is to be backed by the bo manager.
  */
 int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
-		struct ttm_bo_device *bdev);
+		struct ttm_device *bdev);
 
 /**
  * ttm_bo_io
  *
- * @bdev:      Pointer to the struct ttm_bo_device.
+ * @bdev:      Pointer to the struct ttm_device.
  * @filp:      Pointer to the struct file attempting to read / write.
  * @wbuf:      User-space pointer to address of buffer to write. NULL on read.
  * @rbuf:      User-space pointer to address of buffer to read into.
@@ -565,7 +565,7 @@ int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
  * the function may return -ERESTARTSYS if
  * interrupted by a signal.
  */
-ssize_t ttm_bo_io(struct ttm_bo_device *bdev, struct file *filp,
+ssize_t ttm_bo_io(struct ttm_device *bdev, struct file *filp,
 		  const char __user *wbuf, char __user *rbuf,
 		  size_t count, loff_t *f_pos, bool write);
 
@@ -617,7 +617,7 @@ static inline void ttm_bo_unpin(struct ttm_buffer_object *bo)
 	--bo->pin_count;
 }
 
-int ttm_mem_evict_first(struct ttm_bo_device *bdev,
+int ttm_mem_evict_first(struct ttm_device *bdev,
 			struct ttm_resource_manager *man,
 			const struct ttm_place *place,
 			struct ttm_operation_ctx *ctx,
@@ -642,5 +642,6 @@ void ttm_bo_vm_close(struct vm_area_struct *vma);
 
 int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
 		     void *buf, int len, int write);
+bool ttm_bo_delayed_delete(struct ttm_device *bdev, bool remove_all);
 
 #endif
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 423348414c59..1c9bf993e252 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -37,6 +37,8 @@
 #include <linux/spinlock.h>
 #include <linux/dma-resv.h>
 
+#include <drm/ttm/ttm_device.h>
+
 #include "ttm_bo_api.h"
 #include "ttm_memory.h"
 #include "ttm_placement.h"
@@ -44,295 +46,6 @@
 #include "ttm_pool.h"
 
 /**
- * struct ttm_bo_driver
- *
- * @create_ttm_backend_entry: Callback to create a struct ttm_backend.
- * @evict_flags: Callback to obtain placement flags when a buffer is evicted.
- * @move: Callback for a driver to hook in accelerated functions to
- * move a buffer.
- * If set to NULL, a potentially slow memcpy() move is used.
- */
-
-struct ttm_bo_driver {
-	/**
-	 * ttm_tt_create
-	 *
-	 * @bo: The buffer object to create the ttm for.
-	 * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
-	 *
-	 * Create a struct ttm_tt to back data with system memory pages.
-	 * No pages are actually allocated.
-	 * Returns:
-	 * NULL: Out of memory.
-	 */
-	struct ttm_tt *(*ttm_tt_create)(struct ttm_buffer_object *bo,
-					uint32_t page_flags);
-
-	/**
-	 * ttm_tt_populate
-	 *
-	 * @ttm: The struct ttm_tt to contain the backing pages.
-	 *
-	 * Allocate all backing pages
-	 * Returns:
-	 * -ENOMEM: Out of memory.
-	 */
-	int (*ttm_tt_populate)(struct ttm_bo_device *bdev,
-			       struct ttm_tt *ttm,
-			       struct ttm_operation_ctx *ctx);
-
-	/**
-	 * ttm_tt_unpopulate
-	 *
-	 * @ttm: The struct ttm_tt to contain the backing pages.
-	 *
-	 * Free all backing page
-	 */
-	void (*ttm_tt_unpopulate)(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
-
-	/**
-	 * ttm_tt_destroy
-	 *
-	 * @bdev: Pointer to a ttm device
-	 * @ttm: Pointer to a struct ttm_tt.
-	 *
-	 * Destroy the backend. This will be call back from ttm_tt_destroy so
-	 * don't call ttm_tt_destroy from the callback or infinite loop.
-	 */
-	void (*ttm_tt_destroy)(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
-
-	/**
-	 * struct ttm_bo_driver member eviction_valuable
-	 *
-	 * @bo: the buffer object to be evicted
-	 * @place: placement we need room for
-	 *
-	 * Check with the driver if it is valuable to evict a BO to make room
-	 * for a certain placement.
-	 */
-	bool (*eviction_valuable)(struct ttm_buffer_object *bo,
-				  const struct ttm_place *place);
-	/**
-	 * struct ttm_bo_driver member evict_flags:
-	 *
-	 * @bo: the buffer object to be evicted
-	 *
-	 * Return the bo flags for a buffer which is not mapped to the hardware.
-	 * These will be placed in proposed_flags so that when the move is
-	 * finished, they'll end up in bo->mem.flags
-	 * This should not cause multihop evictions, and the core will warn
-	 * if one is proposed.
-	 */
-
-	void (*evict_flags)(struct ttm_buffer_object *bo,
-			    struct ttm_placement *placement);
-
-	/**
-	 * struct ttm_bo_driver member move:
-	 *
-	 * @bo: the buffer to move
-	 * @evict: whether this motion is evicting the buffer from
-	 * the graphics address space
-	 * @ctx: context for this move with parameters
-	 * @new_mem: the new memory region receiving the buffer
-	 @ @hop: placement for driver directed intermediate hop
-	 *
-	 * Move a buffer between two memory regions.
-	 * Returns errno -EMULTIHOP if driver requests a hop
-	 */
-	int (*move)(struct ttm_buffer_object *bo, bool evict,
-		    struct ttm_operation_ctx *ctx,
-		    struct ttm_resource *new_mem,
-		    struct ttm_place *hop);
-
-	/**
-	 * struct ttm_bo_driver_member verify_access
-	 *
-	 * @bo: Pointer to a buffer object.
-	 * @filp: Pointer to a struct file trying to access the object.
-	 *
-	 * Called from the map / write / read methods to verify that the
-	 * caller is permitted to access the buffer object.
-	 * This member may be set to NULL, which will refuse this kind of
-	 * access for all buffer objects.
-	 * This function should return 0 if access is granted, -EPERM otherwise.
-	 */
-	int (*verify_access)(struct ttm_buffer_object *bo,
-			     struct file *filp);
-
-	/**
-	 * Hook to notify driver about a resource delete.
-	 */
-	void (*delete_mem_notify)(struct ttm_buffer_object *bo);
-
-	/**
-	 * notify the driver that we're about to swap out this bo
-	 */
-	void (*swap_notify)(struct ttm_buffer_object *bo);
-
-	/**
-	 * Driver callback on when mapping io memory (for bo_move_memcpy
-	 * for instance). TTM will take care to call io_mem_free whenever
-	 * the mapping is not use anymore. io_mem_reserve & io_mem_free
-	 * are balanced.
-	 */
-	int (*io_mem_reserve)(struct ttm_bo_device *bdev,
-			      struct ttm_resource *mem);
-	void (*io_mem_free)(struct ttm_bo_device *bdev,
-			    struct ttm_resource *mem);
-
-	/**
-	 * Return the pfn for a given page_offset inside the BO.
-	 *
-	 * @bo: the BO to look up the pfn for
-	 * @page_offset: the offset to look up
-	 */
-	unsigned long (*io_mem_pfn)(struct ttm_buffer_object *bo,
-				    unsigned long page_offset);
-
-	/**
-	 * Read/write memory buffers for ptrace access
-	 *
-	 * @bo: the BO to access
-	 * @offset: the offset from the start of the BO
-	 * @buf: pointer to source/destination buffer
-	 * @len: number of bytes to copy
-	 * @write: whether to read (0) from or write (non-0) to BO
-	 *
-	 * If successful, this function should return the number of
-	 * bytes copied, -EIO otherwise. If the number of bytes
-	 * returned is < len, the function may be called again with
-	 * the remainder of the buffer to copy.
-	 */
-	int (*access_memory)(struct ttm_buffer_object *bo, unsigned long offset,
-			     void *buf, int len, int write);
-
-	/**
-	 * struct ttm_bo_driver member del_from_lru_notify
-	 *
-	 * @bo: the buffer object deleted from lru
-	 *
-	 * notify driver that a BO was deleted from LRU.
-	 */
-	void (*del_from_lru_notify)(struct ttm_buffer_object *bo);
-
-	/**
-	 * Notify the driver that we're about to release a BO
-	 *
-	 * @bo: BO that is about to be released
-	 *
-	 * Gives the driver a chance to do any cleanup, including
-	 * adding fences that may force a delayed delete
-	 */
-	void (*release_notify)(struct ttm_buffer_object *bo);
-};
-
-/**
- * struct ttm_bo_global - Buffer object driver global data.
- *
- * @dummy_read_page: Pointer to a dummy page used for mapping requests
- * of unpopulated pages.
- * @shrink: A shrink callback object used for buffer object swap.
- * @device_list_mutex: Mutex protecting the device list.
- * This mutex is held while traversing the device list for pm options.
- * @lru_lock: Spinlock protecting the bo subsystem lru lists.
- * @device_list: List of buffer object devices.
- * @swap_lru: Lru list of buffer objects used for swapping.
- */
-
-extern struct ttm_bo_global {
-
-	/**
-	 * Constant after init.
-	 */
-
-	struct kobject kobj;
-	struct page *dummy_read_page;
-	spinlock_t lru_lock;
-
-	/**
-	 * Protected by ttm_global_mutex.
-	 */
-	struct list_head device_list;
-
-	/**
-	 * Protected by the lru_lock.
-	 */
-	struct list_head swap_lru[TTM_MAX_BO_PRIORITY];
-
-	/**
-	 * Internal protection.
-	 */
-	atomic_t bo_count;
-} ttm_bo_glob;
-
-
-#define TTM_NUM_MEM_TYPES 8
-
-/**
- * struct ttm_bo_device - Buffer object driver device-specific data.
- *
- * @driver: Pointer to a struct ttm_bo_driver struct setup by the driver.
- * @man: An array of resource_managers.
- * @vma_manager: Address space manager (pointer)
- * lru_lock: Spinlock that protects the buffer+device lru lists and
- * ddestroy lists.
- * @dev_mapping: A pointer to the struct address_space representing the
- * device address space.
- * @wq: Work queue structure for the delayed delete workqueue.
- *
- */
-
-struct ttm_bo_device {
-
-	/*
-	 * Constant after bo device init / atomic.
-	 */
-	struct list_head device_list;
-	struct ttm_bo_driver *driver;
-	/*
-	 * access via ttm_manager_type.
-	 */
-	struct ttm_resource_manager sysman;
-	struct ttm_resource_manager *man_drv[TTM_NUM_MEM_TYPES];
-	/*
-	 * Protected by internal locks.
-	 */
-	struct drm_vma_offset_manager *vma_manager;
-	struct ttm_pool pool;
-
-	/*
-	 * Protected by the global:lru lock.
-	 */
-	struct list_head ddestroy;
-
-	/*
-	 * Protected by load / firstopen / lastclose /unload sync.
-	 */
-
-	struct address_space *dev_mapping;
-
-	/*
-	 * Internal protection.
-	 */
-
-	struct delayed_work wq;
-};
-
-static inline struct ttm_resource_manager *ttm_manager_type(struct ttm_bo_device *bdev,
-							    int mem_type)
-{
-	return bdev->man_drv[mem_type];
-}
-
-static inline void ttm_set_driver_manager(struct ttm_bo_device *bdev,
-					  int type,
-					  struct ttm_resource_manager *manager)
-{
-	bdev->man_drv[type] = manager;
-}
-
-/**
  * struct ttm_lru_bulk_move_pos
  *
  * @first: first BO in the bulk move range
@@ -388,31 +101,6 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
 		     struct ttm_resource *mem,
 		     struct ttm_operation_ctx *ctx);
 
-int ttm_bo_device_release(struct ttm_bo_device *bdev);
-
-/**
- * ttm_bo_device_init
- *
- * @bdev: A pointer to a struct ttm_bo_device to initialize.
- * @glob: A pointer to an initialized struct ttm_bo_global.
- * @driver: A pointer to a struct ttm_bo_driver set up by the caller.
- * @dev: The core kernel device pointer for DMA mappings and allocations.
- * @mapping: The address space to use for this bo.
- * @vma_manager: A pointer to a vma manager.
- * @use_dma_alloc: If coherent DMA allocation API should be used.
- * @use_dma32: If we should use GFP_DMA32 for device memory allocations.
- *
- * Initializes a struct ttm_bo_device:
- * Returns:
- * !0: Failure.
- */
-int ttm_bo_device_init(struct ttm_bo_device *bdev,
-		       struct ttm_bo_driver *driver,
-		       struct device *dev,
-		       struct address_space *mapping,
-		       struct drm_vma_offset_manager *vma_manager,
-		       bool use_dma_alloc, bool use_dma32);
-
 /**
  * ttm_bo_unmap_virtual
  *
@@ -494,9 +182,9 @@ static inline int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
 static inline void
 ttm_bo_move_to_lru_tail_unlocked(struct ttm_buffer_object *bo)
 {
-	spin_lock(&ttm_bo_glob.lru_lock);
+	spin_lock(&ttm_glob.lru_lock);
 	ttm_bo_move_to_lru_tail(bo, &bo->mem, NULL);
-	spin_unlock(&ttm_bo_glob.lru_lock);
+	spin_unlock(&ttm_glob.lru_lock);
 }
 
 static inline void ttm_bo_assign_mem(struct ttm_buffer_object *bo,
@@ -538,9 +226,9 @@ static inline void ttm_bo_unreserve(struct ttm_buffer_object *bo)
 /*
  * ttm_bo_util.c
  */
-int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
+int ttm_mem_io_reserve(struct ttm_device *bdev,
 		       struct ttm_resource *mem);
-void ttm_mem_io_free(struct ttm_bo_device *bdev,
+void ttm_mem_io_free(struct ttm_device *bdev,
 		     struct ttm_resource *mem);
 
 /**
@@ -631,7 +319,7 @@ void ttm_bo_tt_destroy(struct ttm_buffer_object *bo);
  * Initialise a generic range manager for the selected memory type.
  * The range manager is installed for this device in the type slot.
  */
-int ttm_range_man_init(struct ttm_bo_device *bdev,
+int ttm_range_man_init(struct ttm_device *bdev,
 		       unsigned type, bool use_tt,
 		       unsigned long p_size);
 
@@ -643,7 +331,7 @@ int ttm_range_man_init(struct ttm_bo_device *bdev,
  *
  * Remove the generic range manager from a slot and tear it down.
  */
-int ttm_range_man_fini(struct ttm_bo_device *bdev,
+int ttm_range_man_fini(struct ttm_device *bdev,
 		       unsigned type);
 
 #endif
diff --git a/include/drm/ttm/ttm_device.h b/include/drm/ttm/ttm_device.h
new file mode 100644
index 000000000000..7bc8bb797161
--- /dev/null
+++ b/include/drm/ttm/ttm_device.h
@@ -0,0 +1,319 @@
+/*
+ * Copyright 2020 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Christian König
+ */
+
+#ifndef _TTM_DEVICE_H_
+#define _TTM_DEVICE_H_
+
+#include <linux/types.h>
+#include <linux/workqueue.h>
+#include <drm/ttm/ttm_resource.h>
+#include <drm/ttm/ttm_pool.h>
+
+#define TTM_NUM_MEM_TYPES 8
+
+struct ttm_device;
+struct ttm_placement;
+struct ttm_buffer_object;
+struct ttm_operation_ctx;
+
+/**
+ * struct ttm_global - Buffer object driver global data.
+ *
+ * @dummy_read_page: Pointer to a dummy page used for mapping requests
+ * of unpopulated pages.
+ * @shrink: A shrink callback object used for buffer object swap.
+ * @device_list_mutex: Mutex protecting the device list.
+ * This mutex is held while traversing the device list for pm options.
+ * @lru_lock: Spinlock protecting the bo subsystem lru lists.
+ * @device_list: List of buffer object devices.
+ * @swap_lru: Lru list of buffer objects used for swapping.
+ */
+extern struct ttm_global {
+
+	/**
+	 * Constant after init.
+	 */
+
+	struct kobject kobj;
+	struct page *dummy_read_page;
+	spinlock_t lru_lock;
+
+	/**
+	 * Protected by ttm_global_mutex.
+	 */
+	struct list_head device_list;
+
+	/**
+	 * Protected by the lru_lock.
+	 */
+	struct list_head swap_lru[TTM_MAX_BO_PRIORITY];
+
+	/**
+	 * Internal protection.
+	 */
+	atomic_t bo_count;
+} ttm_glob;
+
+struct ttm_device_funcs {
+	/**
+	 * ttm_tt_create
+	 *
+	 * @bo: The buffer object to create the ttm for.
+	 * @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
+	 *
+	 * Create a struct ttm_tt to back data with system memory pages.
+	 * No pages are actually allocated.
+	 * Returns:
+	 * NULL: Out of memory.
+	 */
+	struct ttm_tt *(*ttm_tt_create)(struct ttm_buffer_object *bo,
+					uint32_t page_flags);
+
+	/**
+	 * ttm_tt_populate
+	 *
+	 * @ttm: The struct ttm_tt to contain the backing pages.
+	 *
+	 * Allocate all backing pages
+	 * Returns:
+	 * -ENOMEM: Out of memory.
+	 */
+	int (*ttm_tt_populate)(struct ttm_device *bdev,
+			       struct ttm_tt *ttm,
+			       struct ttm_operation_ctx *ctx);
+
+	/**
+	 * ttm_tt_unpopulate
+	 *
+	 * @ttm: The struct ttm_tt to contain the backing pages.
+	 *
+	 * Free all backing page
+	 */
+	void (*ttm_tt_unpopulate)(struct ttm_device *bdev,
+				  struct ttm_tt *ttm);
+
+	/**
+	 * ttm_tt_destroy
+	 *
+	 * @bdev: Pointer to a ttm device
+	 * @ttm: Pointer to a struct ttm_tt.
+	 *
+	 * Destroy the backend. This will be call back from ttm_tt_destroy so
+	 * don't call ttm_tt_destroy from the callback or infinite loop.
+	 */
+	void (*ttm_tt_destroy)(struct ttm_device *bdev, struct ttm_tt *ttm);
+
+	/**
+	 * struct ttm_bo_driver member eviction_valuable
+	 *
+	 * @bo: the buffer object to be evicted
+	 * @place: placement we need room for
+	 *
+	 * Check with the driver if it is valuable to evict a BO to make room
+	 * for a certain placement.
+	 */
+	bool (*eviction_valuable)(struct ttm_buffer_object *bo,
+				  const struct ttm_place *place);
+	/**
+	 * struct ttm_bo_driver member evict_flags:
+	 *
+	 * @bo: the buffer object to be evicted
+	 *
+	 * Return the bo flags for a buffer which is not mapped to the hardware.
+	 * These will be placed in proposed_flags so that when the move is
+	 * finished, they'll end up in bo->mem.flags
+	 * This should not cause multihop evictions, and the core will warn
+	 * if one is proposed.
+	 */
+
+	void (*evict_flags)(struct ttm_buffer_object *bo,
+			    struct ttm_placement *placement);
+
+	/**
+	 * struct ttm_bo_driver member move:
+	 *
+	 * @bo: the buffer to move
+	 * @evict: whether this motion is evicting the buffer from
+	 * the graphics address space
+	 * @ctx: context for this move with parameters
+	 * @new_mem: the new memory region receiving the buffer
+	 @ @hop: placement for driver directed intermediate hop
+	 *
+	 * Move a buffer between two memory regions.
+	 * Returns errno -EMULTIHOP if driver requests a hop
+	 */
+	int (*move)(struct ttm_buffer_object *bo, bool evict,
+		    struct ttm_operation_ctx *ctx,
+		    struct ttm_resource *new_mem,
+		    struct ttm_place *hop);
+
+	/**
+	 * struct ttm_bo_driver_member verify_access
+	 *
+	 * @bo: Pointer to a buffer object.
+	 * @filp: Pointer to a struct file trying to access the object.
+	 *
+	 * Called from the map / write / read methods to verify that the
+	 * caller is permitted to access the buffer object.
+	 * This member may be set to NULL, which will refuse this kind of
+	 * access for all buffer objects.
+	 * This function should return 0 if access is granted, -EPERM otherwise.
+	 */
+	int (*verify_access)(struct ttm_buffer_object *bo,
+			     struct file *filp);
+
+	/**
+	 * Hook to notify driver about a resource delete.
+	 */
+	void (*delete_mem_notify)(struct ttm_buffer_object *bo);
+
+	/**
+	 * notify the driver that we're about to swap out this bo
+	 */
+	void (*swap_notify)(struct ttm_buffer_object *bo);
+
+	/**
+	 * Driver callback on when mapping io memory (for bo_move_memcpy
+	 * for instance). TTM will take care to call io_mem_free whenever
+	 * the mapping is not use anymore. io_mem_reserve & io_mem_free
+	 * are balanced.
+	 */
+	int (*io_mem_reserve)(struct ttm_device *bdev,
+			      struct ttm_resource *mem);
+	void (*io_mem_free)(struct ttm_device *bdev,
+			    struct ttm_resource *mem);
+
+	/**
+	 * Return the pfn for a given page_offset inside the BO.
+	 *
+	 * @bo: the BO to look up the pfn for
+	 * @page_offset: the offset to look up
+	 */
+	unsigned long (*io_mem_pfn)(struct ttm_buffer_object *bo,
+				    unsigned long page_offset);
+
+	/**
+	 * Read/write memory buffers for ptrace access
+	 *
+	 * @bo: the BO to access
+	 * @offset: the offset from the start of the BO
+	 * @buf: pointer to source/destination buffer
+	 * @len: number of bytes to copy
+	 * @write: whether to read (0) from or write (non-0) to BO
+	 *
+	 * If successful, this function should return the number of
+	 * bytes copied, -EIO otherwise. If the number of bytes
+	 * returned is < len, the function may be called again with
+	 * the remainder of the buffer to copy.
+	 */
+	int (*access_memory)(struct ttm_buffer_object *bo, unsigned long offset,
+			     void *buf, int len, int write);
+
+	/**
+	 * struct ttm_bo_driver member del_from_lru_notify
+	 *
+	 * @bo: the buffer object deleted from lru
+	 *
+	 * notify driver that a BO was deleted from LRU.
+	 */
+	void (*del_from_lru_notify)(struct ttm_buffer_object *bo);
+
+	/**
+	 * Notify the driver that we're about to release a BO
+	 *
+	 * @bo: BO that is about to be released
+	 *
+	 * Gives the driver a chance to do any cleanup, including
+	 * adding fences that may force a delayed delete
+	 */
+	void (*release_notify)(struct ttm_buffer_object *bo);
+};
+
+/**
+ * struct ttm_device - Buffer object driver device-specific data.
+ *
+ * @device_list: Our entry in the global device list.
+ * @funcs: Function table for the device.
+ * @sysman: Resource manager for the system domain.
+ * @man_drv: An array of resource_managers.
+ * @vma_manager: Address space manager.
+ * @pool: page pool for the device.
+ * @dev_mapping: A pointer to the struct address_space representing the
+ * device address space.
+ * @wq: Work queue structure for the delayed delete workqueue.
+ */
+struct ttm_device {
+	/*
+	 * Constant after bo device init
+	 */
+	struct list_head device_list;
+	struct ttm_device_funcs *funcs;
+
+	/*
+	 * Access via ttm_manager_type.
+	 */
+	struct ttm_resource_manager sysman;
+	struct ttm_resource_manager *man_drv[TTM_NUM_MEM_TYPES];
+
+	/*
+	 * Protected by internal locks.
+	 */
+	struct drm_vma_offset_manager *vma_manager;
+	struct ttm_pool pool;
+
+	/*
+	 * Protected by the global:lru lock.
+	 */
+	struct list_head ddestroy;
+
+	/*
+	 * Protected by load / firstopen / lastclose /unload sync.
+	 */
+	struct address_space *dev_mapping;
+
+	/*
+	 * Internal protection.
+	 */
+	struct delayed_work wq;
+};
+
+static inline struct ttm_resource_manager *
+ttm_manager_type(struct ttm_device *bdev, int mem_type)
+{
+	return bdev->man_drv[mem_type];
+}
+
+static inline void ttm_set_driver_manager(struct ttm_device *bdev, int type,
+					  struct ttm_resource_manager *manager)
+{
+	bdev->man_drv[type] = manager;
+}
+
+int ttm_device_init(struct ttm_device *bdev, struct ttm_device_funcs *funcs,
+		    struct device *dev, struct address_space *mapping,
+		    struct drm_vma_offset_manager *vma_manager,
+		    bool use_dma_alloc, bool use_dma32);
+void ttm_device_fini(struct ttm_device *bdev);
+
+#endif
diff --git a/include/drm/ttm/ttm_resource.h b/include/drm/ttm/ttm_resource.h
index da0ed7e8c915..6164ccf4f308 100644
--- a/include/drm/ttm/ttm_resource.h
+++ b/include/drm/ttm/ttm_resource.h
@@ -33,7 +33,7 @@
 
 #define TTM_MAX_BO_PRIORITY	4U
 
-struct ttm_bo_device;
+struct ttm_device;
 struct ttm_resource_manager;
 struct ttm_resource;
 struct ttm_place;
@@ -233,7 +233,7 @@ void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource *res);
 void ttm_resource_manager_init(struct ttm_resource_manager *man,
 			       unsigned long p_size);
 
-int ttm_resource_manager_evict_all(struct ttm_bo_device *bdev,
+int ttm_resource_manager_evict_all(struct ttm_device *bdev,
 				   struct ttm_resource_manager *man);
 
 void ttm_resource_manager_debug(struct ttm_resource_manager *man,
diff --git a/include/drm/ttm/ttm_tt.h b/include/drm/ttm/ttm_tt.h
index 6c8eb9a4de81..0020a0588985 100644
--- a/include/drm/ttm/ttm_tt.h
+++ b/include/drm/ttm/ttm_tt.h
@@ -118,14 +118,14 @@ void ttm_tt_fini(struct ttm_tt *ttm);
  *
  * Unbind, unpopulate and destroy common struct ttm_tt.
  */
-void ttm_tt_destroy(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
+void ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm);
 
 /**
  * ttm_tt_destroy_common:
  *
  * Called from driver to destroy common path.
  */
-void ttm_tt_destroy_common(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
+void ttm_tt_destroy_common(struct ttm_device *bdev, struct ttm_tt *ttm);
 
 /**
  * ttm_tt_swapin:
@@ -135,7 +135,7 @@ void ttm_tt_destroy_common(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
  * Swap in a previously swap out ttm_tt.
  */
 int ttm_tt_swapin(struct ttm_tt *ttm);
-int ttm_tt_swapout(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
+int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm);
 
 /**
  * ttm_tt_populate - allocate pages for a ttm
@@ -144,7 +144,7 @@ int ttm_tt_swapout(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
  *
  * Calls the driver method to allocate pages for a ttm
  */
-int ttm_tt_populate(struct ttm_bo_device *bdev, struct ttm_tt *ttm, struct ttm_operation_ctx *ctx);
+int ttm_tt_populate(struct ttm_device *bdev, struct ttm_tt *ttm, struct ttm_operation_ctx *ctx);
 
 /**
  * ttm_tt_unpopulate - free pages from a ttm
@@ -153,7 +153,7 @@ int ttm_tt_populate(struct ttm_bo_device *bdev, struct ttm_tt *ttm, struct ttm_o
  *
  * Calls the driver method to free all pages from a ttm
  */
-void ttm_tt_unpopulate(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
+void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm);
 
 #if IS_ENABLED(CONFIG_AGP)
 #include <linux/agp_backend.h>