drm/ttm: merge ttm_bo_api.h and ttm_bo_driver.h v2

Merge and cleanup the two headers into a single description of the
object API. Also move all the documentation to the implementation and
drop unnecessary includes from the header.

No functional change.

v2: minimal checkpatch.pl cleanup

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221125102137.1801-4-christian.koenig@amd.com

5 files changed, 169 insertions, 488 deletions

diff --git a/include/drm/drm_gem_ttm_helper.h b/include/drm/drm_gem_ttm_helper.h
index 4c003b4f173e..7b53d673ae7e 100644
--- a/include/drm/drm_gem_ttm_helper.h
+++ b/include/drm/drm_gem_ttm_helper.h
@@ -7,8 +7,7 @@
 
 #include <drm/drm_device.h>
 #include <drm/drm_gem.h>
-#include <drm/ttm/ttm_bo_api.h>
-#include <drm/ttm/ttm_bo_driver.h>
+#include <drm/ttm/ttm_bo.h>
 
 struct iosys_map;
 
diff --git a/include/drm/drm_gem_vram_helper.h b/include/drm/drm_gem_vram_helper.h
index c083a1d71cf4..d3e8920c0b64 100644
--- a/include/drm/drm_gem_vram_helper.h
+++ b/include/drm/drm_gem_vram_helper.h
@@ -8,8 +8,8 @@
 #include <drm/drm_gem_ttm_helper.h>
 #include <drm/drm_ioctl.h>
 #include <drm/drm_modes.h>
-#include <drm/ttm/ttm_bo_api.h>
-#include <drm/ttm/ttm_bo_driver.h>
+#include <drm/ttm/ttm_bo.h>
+#include <drm/ttm/ttm_placement.h>
 
 #include <linux/container_of.h>
 #include <linux/iosys-map.h>
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo.h
index 69e62bbb01e3..d87232472435 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo.h
@@ -32,28 +32,24 @@
 #define _TTM_BO_API_H_
 
 #include <drm/drm_gem.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/bitmap.h>
-#include <linux/dma-resv.h>
-
-#include "ttm_resource.h"
 
-struct ttm_global;
+#include "ttm_device.h"
 
-struct ttm_device;
+/* Default number of pre-faulted pages in the TTM fault handler */
+#define TTM_BO_VM_NUM_PREFAULT 16
 
 struct iosys_map;
 
-struct drm_mm_node;
-
+struct ttm_global;
+struct ttm_device;
 struct ttm_placement;
-
 struct ttm_place;
+struct ttm_resource;
+struct ttm_resource_manager;
+struct ttm_tt;
 
 /**
  * enum ttm_bo_type
@@ -68,15 +64,12 @@ struct ttm_place;
  * @ttm_bo_type_sg: Buffer made from dmabuf sg table shared with another
  * driver.
  */
-
 enum ttm_bo_type {
 	ttm_bo_type_device,
 	ttm_bo_type_kernel,
 	ttm_bo_type_sg
 };
 
-struct ttm_tt;
-
 /**
  * struct ttm_buffer_object
  *
@@ -85,17 +78,11 @@ struct ttm_tt;
  * @type: The bo type.
  * @page_alignment: Page alignment.
  * @destroy: Destruction function. If NULL, kfree is used.
- * @num_pages: Actual number of pages.
  * @kref: Reference count of this buffer object. When this refcount reaches
  * zero, the object is destroyed or put on the delayed delete list.
- * @mem: structure describing current placement.
+ * @resource: structure describing current placement.
  * @ttm: TTM structure holding system pages.
- * @evicted: Whether the object was evicted without user-space knowing.
  * @deleted: True if the object is only a zombie and already deleted.
- * @swap: List head for swap LRU list.
- * @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.
  *
  * Base class for TTM buffer object, that deals with data placement and CPU
  * mappings. GPU mappings are really up to the driver, but for simpler GPUs
@@ -108,28 +95,25 @@ struct ttm_tt;
  * The destroy member, the API visibility of this object makes it possible
  * to derive driver specific types.
  */
-
 struct ttm_buffer_object {
 	struct drm_gem_object base;
 
-	/**
+	/*
 	 * Members constant at init.
 	 */
-
 	struct ttm_device *bdev;
 	enum ttm_bo_type type;
 	uint32_t page_alignment;
 	void (*destroy) (struct ttm_buffer_object *);
 
-	/**
+	/*
 	* Members not needing protection.
 	*/
 	struct kref kref;
 
-	/**
+	/*
 	 * Members protected by the bo::resv::reserved lock.
 	 */
-
 	struct ttm_resource *resource;
 	struct ttm_tt *ttm;
 	bool deleted;
@@ -148,7 +132,6 @@ struct ttm_buffer_object {
 	 * and the bo::lock when written to. Can be read with
 	 * either of these locks held.
 	 */
-
 	struct sg_table *sg;
 };
 
@@ -164,7 +147,6 @@ struct ttm_buffer_object {
  * mapping can either be an ioremap, a vmap, a kmap or part of a
  * premapped region.
  */
-
 #define TTM_BO_MAP_IOMEM_MASK 0x80
 struct ttm_bo_kmap_obj {
 	void *virtual;
@@ -232,79 +214,120 @@ ttm_bo_get_unless_zero(struct ttm_buffer_object *bo)
 }
 
 /**
- * ttm_bo_wait - wait for buffer idle.
+ * ttm_bo_reserve:
+ *
+ * @bo: A pointer to a struct ttm_buffer_object.
+ * @interruptible: Sleep interruptible if waiting.
+ * @no_wait: Don't sleep while trying to reserve, rather return -EBUSY.
+ * @ticket: ticket used to acquire the ww_mutex.
  *
- * @bo:  The buffer object.
- * @interruptible:  Use interruptible wait.
- * @no_wait:  Return immediately if buffer is busy.
+ * Locks a buffer object for validation. (Or prevents other processes from
+ * locking it for validation), while taking a number of measures to prevent
+ * deadlocks.
  *
- * This function must be called with the bo::mutex held, and makes
- * sure any previous rendering to the buffer is completed.
- * Note: It might be necessary to block validations before the
- * wait by reserving the buffer.
- * Returns -EBUSY if no_wait is true and the buffer is busy.
- * Returns -ERESTARTSYS if interrupted by a signal.
+ * Returns:
+ * -EDEADLK: The reservation may cause a deadlock.
+ * Release all buffer reservations, wait for @bo to become unreserved and
+ * try again.
+ * -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by
+ * a signal. Release all buffer reservations and return to user-space.
+ * -EBUSY: The function needed to sleep, but @no_wait was true
+ * -EALREADY: Bo already reserved using @ticket. This error code will only
+ * be returned if @use_ticket is set to true.
  */
-int ttm_bo_wait(struct ttm_buffer_object *bo, bool interruptible, bool no_wait);
-
-static inline int ttm_bo_wait_ctx(struct ttm_buffer_object *bo, struct ttm_operation_ctx *ctx)
+static inline int ttm_bo_reserve(struct ttm_buffer_object *bo,
+				 bool interruptible, bool no_wait,
+				 struct ww_acquire_ctx *ticket)
 {
-	return ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
+	int ret = 0;
+
+	if (no_wait) {
+		bool success;
+
+		if (WARN_ON(ticket))
+			return -EBUSY;
+
+		success = dma_resv_trylock(bo->base.resv);
+		return success ? 0 : -EBUSY;
+	}
+
+	if (interruptible)
+		ret = dma_resv_lock_interruptible(bo->base.resv, ticket);
+	else
+		ret = dma_resv_lock(bo->base.resv, ticket);
+	if (ret == -EINTR)
+		return -ERESTARTSYS;
+	return ret;
 }
 
 /**
- * ttm_bo_validate
- *
- * @bo: The buffer object.
- * @placement: Proposed placement for the buffer object.
- * @ctx: validation parameters.
- *
- * Changes placement and caching policy of the buffer object
- * according proposed placement.
- * Returns
- * -EINVAL on invalid proposed placement.
- * -ENOMEM on out-of-memory condition.
- * -EBUSY if no_wait is true and buffer busy.
- * -ERESTARTSYS if interrupted by a signal.
+ * ttm_bo_reserve_slowpath:
+ * @bo: A pointer to a struct ttm_buffer_object.
+ * @interruptible: Sleep interruptible if waiting.
+ * @sequence: Set (@bo)->sequence to this value after lock
+ *
+ * This is called after ttm_bo_reserve returns -EAGAIN and we backed off
+ * from all our other reservations. Because there are no other reservations
+ * held by us, this function cannot deadlock any more.
  */
-int ttm_bo_validate(struct ttm_buffer_object *bo,
-		    struct ttm_placement *placement,
-		    struct ttm_operation_ctx *ctx);
+static inline int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
+					  bool interruptible,
+					  struct ww_acquire_ctx *ticket)
+{
+	if (interruptible) {
+		int ret = dma_resv_lock_slow_interruptible(bo->base.resv,
+							   ticket);
+		if (ret == -EINTR)
+			ret = -ERESTARTSYS;
+		return ret;
+	}
+	dma_resv_lock_slow(bo->base.resv, ticket);
+	return 0;
+}
+
+void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo);
+
+static inline void
+ttm_bo_move_to_lru_tail_unlocked(struct ttm_buffer_object *bo)
+{
+	spin_lock(&bo->bdev->lru_lock);
+	ttm_bo_move_to_lru_tail(bo);
+	spin_unlock(&bo->bdev->lru_lock);
+}
+
+static inline void ttm_bo_assign_mem(struct ttm_buffer_object *bo,
+				     struct ttm_resource *new_mem)
+{
+	WARN_ON(bo->resource);
+	bo->resource = new_mem;
+}
 
 /**
- * ttm_bo_put
- *
- * @bo: The buffer object.
+ * ttm_bo_move_null = assign memory for a buffer object.
+ * @bo: The bo to assign the memory to
+ * @new_mem: The memory to be assigned.
  *
- * Unreference a buffer object.
+ * Assign the memory from new_mem to the memory of the buffer object bo.
  */
-void ttm_bo_put(struct ttm_buffer_object *bo);
-
-void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo);
-void ttm_bo_set_bulk_move(struct ttm_buffer_object *bo,
-			  struct ttm_lru_bulk_move *bulk);
+static inline void ttm_bo_move_null(struct ttm_buffer_object *bo,
+				    struct ttm_resource *new_mem)
+{
+	ttm_resource_free(bo, &bo->resource);
+	ttm_bo_assign_mem(bo, new_mem);
+}
 
 /**
- * ttm_bo_eviction_valuable
+ * ttm_bo_unreserve
  *
- * @bo: The buffer object to evict
- * @place: the placement we need to make room for
+ * @bo: A pointer to a struct ttm_buffer_object.
  *
- * Check if it is valuable to evict the BO to make room for the given placement.
+ * Unreserve a previous reservation of @bo.
  */
-bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
-			      const struct ttm_place *place);
-
-int ttm_bo_init_reserved(struct ttm_device *bdev, struct ttm_buffer_object *bo,
-			 enum ttm_bo_type type, struct ttm_placement *placement,
-			 uint32_t alignment, struct ttm_operation_ctx *ctx,
-			 struct sg_table *sg, struct dma_resv *resv,
-			 void (*destroy) (struct ttm_buffer_object *));
-int ttm_bo_init_validate(struct ttm_device *bdev, struct ttm_buffer_object *bo,
-			 enum ttm_bo_type type, struct ttm_placement *placement,
-			 uint32_t alignment, bool interruptible,
-			 struct sg_table *sg, struct dma_resv *resv,
-			 void (*destroy) (struct ttm_buffer_object *));
+static inline void ttm_bo_unreserve(struct ttm_buffer_object *bo)
+{
+	ttm_bo_move_to_lru_tail_unlocked(bo);
+	dma_resv_unlock(bo->base.resv);
+}
 
 /**
  * ttm_kmap_obj_virtual
@@ -324,124 +347,84 @@ static inline void *ttm_kmap_obj_virtual(struct ttm_bo_kmap_obj *map,
 	return map->virtual;
 }
 
-/**
- * ttm_bo_kmap
- *
- * @bo: The buffer object.
- * @start_page: The first page to map.
- * @num_pages: Number of pages to map.
- * @map: pointer to a struct ttm_bo_kmap_obj representing the map.
- *
- * Sets up a kernel virtual mapping, using ioremap, vmap or kmap to the
- * data in the buffer object. The ttm_kmap_obj_virtual function can then be
- * used to obtain a virtual address to the data.
- *
- * Returns
- * -ENOMEM: Out of memory.
- * -EINVAL: Invalid range.
- */
+int ttm_bo_wait(struct ttm_buffer_object *bo, bool interruptible, bool no_wait);
+int ttm_bo_wait_ctx(struct ttm_buffer_object *bo,
+		    struct ttm_operation_ctx *ctx);
+int ttm_bo_validate(struct ttm_buffer_object *bo,
+		    struct ttm_placement *placement,
+		    struct ttm_operation_ctx *ctx);
+void ttm_bo_put(struct ttm_buffer_object *bo);
+void ttm_bo_set_bulk_move(struct ttm_buffer_object *bo,
+			  struct ttm_lru_bulk_move *bulk);
+int ttm_bo_lock_delayed_workqueue(struct ttm_device *bdev);
+void ttm_bo_unlock_delayed_workqueue(struct ttm_device *bdev, int resched);
+bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
+			      const struct ttm_place *place);
+int ttm_bo_init_reserved(struct ttm_device *bdev, struct ttm_buffer_object *bo,
+			 enum ttm_bo_type type, struct ttm_placement *placement,
+			 uint32_t alignment, struct ttm_operation_ctx *ctx,
+			 struct sg_table *sg, struct dma_resv *resv,
+			 void (*destroy)(struct ttm_buffer_object *));
+int ttm_bo_init_validate(struct ttm_device *bdev, struct ttm_buffer_object *bo,
+			 enum ttm_bo_type type, struct ttm_placement *placement,
+			 uint32_t alignment, bool interruptible,
+			 struct sg_table *sg, struct dma_resv *resv,
+			 void (*destroy)(struct ttm_buffer_object *));
 int ttm_bo_kmap(struct ttm_buffer_object *bo, unsigned long start_page,
 		unsigned long num_pages, struct ttm_bo_kmap_obj *map);
-
-/**
- * ttm_bo_kunmap
- *
- * @map: Object describing the map to unmap.
- *
- * Unmaps a kernel map set up by ttm_bo_kmap.
- */
 void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map);
-
-/**
- * ttm_bo_vmap
- *
- * @bo: The buffer object.
- * @map: pointer to a struct iosys_map representing the map.
- *
- * Sets up a kernel virtual mapping, using ioremap or vmap to the
- * data in the buffer object. The parameter @map returns the virtual
- * address as struct iosys_map. Unmap the buffer with ttm_bo_vunmap().
- *
- * Returns
- * -ENOMEM: Out of memory.
- * -EINVAL: Invalid range.
- */
 int ttm_bo_vmap(struct ttm_buffer_object *bo, struct iosys_map *map);
-
-/**
- * ttm_bo_vunmap
- *
- * @bo: The buffer object.
- * @map: Object describing the map to unmap.
- *
- * Unmaps a kernel map set up by ttm_bo_vmap().
- */
 void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct iosys_map *map);
-
-/**
- * ttm_bo_mmap_obj - mmap memory backed by a ttm buffer object.
- *
- * @vma:       vma as input from the fbdev mmap method.
- * @bo:        The bo backing the address space.
- *
- * Maps a buffer object.
- */
 int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo);
-
-/**
- * ttm_bo_io
- *
- * @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.
- * Null on write.
- * @count:     Number of bytes to read / write.
- * @f_pos:     Pointer to current file position.
- * @write:     1 for read, 0 for write.
- *
- * This function implements read / write into ttm buffer objects, and is
- * intended to
- * be called from the fops::read and fops::write method.
- * Returns:
- * See man (2) write, man(2) read. In particular,
- * the function may return -ERESTARTSYS if
- * interrupted by a signal.
- */
-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);
-
 int ttm_bo_swapout(struct ttm_buffer_object *bo, struct ttm_operation_ctx *ctx,
 		   gfp_t gfp_flags);
-
 void ttm_bo_pin(struct ttm_buffer_object *bo);
 void ttm_bo_unpin(struct ttm_buffer_object *bo);
-
 int ttm_mem_evict_first(struct ttm_device *bdev,
 			struct ttm_resource_manager *man,
 			const struct ttm_place *place,
 			struct ttm_operation_ctx *ctx,
 			struct ww_acquire_ctx *ticket);
-
-/* Default number of pre-faulted pages in the TTM fault handler */
-#define TTM_BO_VM_NUM_PREFAULT 16
-
 vm_fault_t ttm_bo_vm_reserve(struct ttm_buffer_object *bo,
 			     struct vm_fault *vmf);
-
 vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
 				    pgprot_t prot,
 				    pgoff_t num_prefault);
-
 vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf);
-
 void ttm_bo_vm_open(struct vm_area_struct *vma);
-
 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);
 vm_fault_t ttm_bo_vm_dummy_page(struct vm_fault *vmf, pgprot_t prot);
 
+int ttm_bo_mem_space(struct ttm_buffer_object *bo,
+		     struct ttm_placement *placement,
+		     struct ttm_resource **mem,
+		     struct ttm_operation_ctx *ctx);
+
+void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo);
+/*
+ * ttm_bo_util.c
+ */
+int ttm_mem_io_reserve(struct ttm_device *bdev,
+		       struct ttm_resource *mem);
+void ttm_mem_io_free(struct ttm_device *bdev,
+		     struct ttm_resource *mem);
+void ttm_move_memcpy(bool clear, u32 num_pages,
+		     struct ttm_kmap_iter *dst_iter,
+		     struct ttm_kmap_iter *src_iter);
+int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
+		       struct ttm_operation_ctx *ctx,
+		       struct ttm_resource *new_mem);
+int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
+			      struct dma_fence *fence, bool evict,
+			      bool pipeline,
+			      struct ttm_resource *new_mem);
+void ttm_bo_move_sync_cleanup(struct ttm_buffer_object *bo,
+			      struct ttm_resource *new_mem);
+int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo);
+pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
+		     pgprot_t tmp);
+void ttm_bo_tt_destroy(struct ttm_buffer_object *bo);
+
 #endif
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
deleted file mode 100644
index 1afa891f488a..000000000000
--- a/include/drm/ttm/ttm_bo_driver.h
+++ /dev/null
@@ -1,303 +0,0 @@
-/**************************************************************************
- *
- * Copyright (c) 2006-2009 Vmware, Inc., Palo Alto, CA., USA
- * All Rights Reserved.
- *
- * 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, sub license, 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 (including the
- * next paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
- * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
- */
-#ifndef _TTM_BO_DRIVER_H_
-#define _TTM_BO_DRIVER_H_
-
-#include <drm/drm_mm.h>
-#include <drm/drm_vma_manager.h>
-#include <linux/workqueue.h>
-#include <linux/fs.h>
-#include <linux/spinlock.h>
-#include <linux/dma-resv.h>
-
-#include <drm/ttm/ttm_device.h>
-
-#include "ttm_bo_api.h"
-#include "ttm_kmap_iter.h"
-#include "ttm_placement.h"
-#include "ttm_tt.h"
-#include "ttm_pool.h"
-
-/*
- * ttm_bo.c
- */
-
-/**
- * ttm_bo_mem_space
- *
- * @bo: Pointer to a struct ttm_buffer_object. the data of which
- * we want to allocate space for.
- * @proposed_placement: Proposed new placement for the buffer object.
- * @mem: A struct ttm_resource.
- * @interruptible: Sleep interruptible when sliping.
- * @no_wait_gpu: Return immediately if the GPU is busy.
- *
- * Allocate memory space for the buffer object pointed to by @bo, using
- * the placement flags in @mem, potentially evicting other idle buffer objects.
- * This function may sleep while waiting for space to become available.
- * Returns:
- * -EBUSY: No space available (only if no_wait == 1).
- * -ENOMEM: Could not allocate memory for the buffer object, either due to
- * fragmentation or concurrent allocators.
- * -ERESTARTSYS: An interruptible sleep was interrupted by a signal.
- */
-int ttm_bo_mem_space(struct ttm_buffer_object *bo,
-		     struct ttm_placement *placement,
-		     struct ttm_resource **mem,
-		     struct ttm_operation_ctx *ctx);
-
-/**
- * ttm_bo_unmap_virtual
- *
- * @bo: tear down the virtual mappings for this BO
- */
-void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo);
-
-/**
- * ttm_bo_reserve:
- *
- * @bo: A pointer to a struct ttm_buffer_object.
- * @interruptible: Sleep interruptible if waiting.
- * @no_wait: Don't sleep while trying to reserve, rather return -EBUSY.
- * @ticket: ticket used to acquire the ww_mutex.
- *
- * Locks a buffer object for validation. (Or prevents other processes from
- * locking it for validation), while taking a number of measures to prevent
- * deadlocks.
- *
- * Returns:
- * -EDEADLK: The reservation may cause a deadlock.
- * Release all buffer reservations, wait for @bo to become unreserved and
- * try again.
- * -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by
- * a signal. Release all buffer reservations and return to user-space.
- * -EBUSY: The function needed to sleep, but @no_wait was true
- * -EALREADY: Bo already reserved using @ticket. This error code will only
- * be returned if @use_ticket is set to true.
- */
-static inline int ttm_bo_reserve(struct ttm_buffer_object *bo,
-				 bool interruptible, bool no_wait,
-				 struct ww_acquire_ctx *ticket)
-{
-	int ret;
-
-	if (no_wait) {
-		bool success;
-		if (WARN_ON(ticket))
-			return -EBUSY;
-
-		success = dma_resv_trylock(bo->base.resv);
-		return success ? 0 : -EBUSY;
-	}
-
-	if (interruptible)
-		ret = dma_resv_lock_interruptible(bo->base.resv, ticket);
-	else
-		ret = dma_resv_lock(bo->base.resv, ticket);
-	if (ret == -EINTR)
-		return -ERESTARTSYS;
-	return ret;
-}
-
-/**
- * ttm_bo_reserve_slowpath:
- * @bo: A pointer to a struct ttm_buffer_object.
- * @interruptible: Sleep interruptible if waiting.
- * @sequence: Set (@bo)->sequence to this value after lock
- *
- * This is called after ttm_bo_reserve returns -EAGAIN and we backed off
- * from all our other reservations. Because there are no other reservations
- * held by us, this function cannot deadlock any more.
- */
-static inline int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
-					  bool interruptible,
-					  struct ww_acquire_ctx *ticket)
-{
-	if (interruptible) {
-		int ret = dma_resv_lock_slow_interruptible(bo->base.resv,
-							   ticket);
-		if (ret == -EINTR)
-			ret = -ERESTARTSYS;
-		return ret;
-	}
-	dma_resv_lock_slow(bo->base.resv, ticket);
-	return 0;
-}
-
-static inline void
-ttm_bo_move_to_lru_tail_unlocked(struct ttm_buffer_object *bo)
-{
-	spin_lock(&bo->bdev->lru_lock);
-	ttm_bo_move_to_lru_tail(bo);
-	spin_unlock(&bo->bdev->lru_lock);
-}
-
-static inline void ttm_bo_assign_mem(struct ttm_buffer_object *bo,
-				     struct ttm_resource *new_mem)
-{
-	WARN_ON(bo->resource);
-	bo->resource = new_mem;
-}
-
-/**
- * ttm_bo_move_null = assign memory for a buffer object.
- * @bo: The bo to assign the memory to
- * @new_mem: The memory to be assigned.
- *
- * Assign the memory from new_mem to the memory of the buffer object bo.
- */
-static inline void ttm_bo_move_null(struct ttm_buffer_object *bo,
-				    struct ttm_resource *new_mem)
-{
-	ttm_resource_free(bo, &bo->resource);
-	ttm_bo_assign_mem(bo, new_mem);
-}
-
-/**
- * ttm_bo_unreserve
- *
- * @bo: A pointer to a struct ttm_buffer_object.
- *
- * Unreserve a previous reservation of @bo.
- */
-static inline void ttm_bo_unreserve(struct ttm_buffer_object *bo)
-{
-	ttm_bo_move_to_lru_tail_unlocked(bo);
-	dma_resv_unlock(bo->base.resv);
-}
-
-/*
- * ttm_bo_util.c
- */
-int ttm_mem_io_reserve(struct ttm_device *bdev,
-		       struct ttm_resource *mem);
-void ttm_mem_io_free(struct ttm_device *bdev,
-		     struct ttm_resource *mem);
-
-/**
- * ttm_bo_move_memcpy
- *
- * @bo: A pointer to a struct ttm_buffer_object.
- * @interruptible: Sleep interruptible if waiting.
- * @no_wait_gpu: Return immediately if the GPU is busy.
- * @new_mem: struct ttm_resource indicating where to move.
- *
- * Fallback move function for a mappable buffer object in mappable memory.
- * The function will, if successful,
- * free any old aperture space, and set (@new_mem)->mm_node to NULL,
- * and update the (@bo)->mem placement flags. If unsuccessful, the old
- * data remains untouched, and it's up to the caller to free the
- * memory space indicated by @new_mem.
- * Returns:
- * !0: Failure.
- */
-
-int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
-		       struct ttm_operation_ctx *ctx,
-		       struct ttm_resource *new_mem);
-
-/**
- * ttm_bo_move_accel_cleanup.
- *
- * @bo: A pointer to a struct ttm_buffer_object.
- * @fence: A fence object that signals when moving is complete.
- * @evict: This is an evict move. Don't return until the buffer is idle.
- * @pipeline: evictions are to be pipelined.
- * @new_mem: struct ttm_resource indicating where to move.
- *
- * Accelerated move function to be called when an accelerated move
- * has been scheduled. The function will create a new temporary buffer object
- * representing the old placement, and put the sync object on both buffer
- * objects. After that the newly created buffer object is unref'd to be
- * destroyed when the move is complete. This will help pipeline
- * buffer moves.
- */
-int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
-			      struct dma_fence *fence, bool evict,
-			      bool pipeline,
-			      struct ttm_resource *new_mem);
-
-/**
- * ttm_bo_move_sync_cleanup.
- *
- * @bo: A pointer to a struct ttm_buffer_object.
- * @new_mem: struct ttm_resource indicating where to move.
- *
- * Special case of ttm_bo_move_accel_cleanup where the bo is guaranteed
- * by the caller to be idle. Typically used after memcpy buffer moves.
- */
-void ttm_bo_move_sync_cleanup(struct ttm_buffer_object *bo,
-			      struct ttm_resource *new_mem);
-
-/**
- * ttm_bo_pipeline_gutting.
- *
- * @bo: A pointer to a struct ttm_buffer_object.
- *
- * Pipelined gutting a BO of its backing store.
- */
-int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo);
-
-/**
- * ttm_io_prot
- *
- * bo: ttm buffer object
- * res: ttm resource object
- * @tmp: Page protection flag for a normal, cached mapping.
- *
- * Utility function that returns the pgprot_t that should be used for
- * setting up a PTE with the caching model indicated by @c_state.
- */
-pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
-		     pgprot_t tmp);
-
-/**
- * ttm_bo_tt_bind
- *
- * Bind the object tt to a memory resource.
- */
-int ttm_bo_tt_bind(struct ttm_buffer_object *bo, struct ttm_resource *mem);
-
-/**
- * ttm_bo_tt_destroy.
- */
-void ttm_bo_tt_destroy(struct ttm_buffer_object *bo);
-
-void ttm_move_memcpy(bool clear,
-		     u32 num_pages,
-		     struct ttm_kmap_iter *dst_iter,
-		     struct ttm_kmap_iter *src_iter);
-
-struct ttm_kmap_iter *
-ttm_kmap_iter_iomap_init(struct ttm_kmap_iter_iomap *iter_io,
-			 struct io_mapping *iomap,
-			 struct sg_table *st,
-			 resource_size_t start);
-#endif
diff --git a/include/drm/ttm/ttm_execbuf_util.h b/include/drm/ttm/ttm_execbuf_util.h
index a99d7fdf2964..03aca29d3ce4 100644
--- a/include/drm/ttm/ttm_execbuf_util.h
+++ b/include/drm/ttm/ttm_execbuf_util.h
@@ -33,7 +33,9 @@
 
 #include <linux/list.h>
 
-#include "ttm_bo_api.h"
+struct ww_acquire_ctx;
+struct dma_fence;
+struct ttm_buffer_object;
 
 /**
  * struct ttm_validate_buffer