Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 663 insertions, 0 deletions

diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
new file mode 100644
index 000000000..09ccfee48
--- /dev/null
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -0,0 +1,663 @@
+/**************************************************************************
+ *
+ * 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_API_H_
+#define _TTM_BO_API_H_
+
+#include <drm/drm_gem.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/bitmap.h>
+#include <linux/dma-resv.h>
+
+#include "ttm_resource.h"
+
+struct ttm_bo_global;
+
+struct ttm_bo_device;
+
+struct drm_mm_node;
+
+struct ttm_placement;
+
+struct ttm_place;
+
+struct ttm_lru_bulk_move;
+
+/**
+ * enum ttm_bo_type
+ *
+ * @ttm_bo_type_device:	These are 'normal' buffers that can
+ * be mmapped by user space. Each of these bos occupy a slot in the
+ * device address space, that can be used for normal vm operations.
+ *
+ * @ttm_bo_type_kernel: These buffers are like ttm_bo_type_device buffers,
+ * but they cannot be accessed from user-space. For kernel-only use.
+ *
+ * @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
+ *
+ * @base: drm_gem_object superclass data.
+ * @bdev: Pointer to the buffer object device structure.
+ * @type: The bo type.
+ * @destroy: Destruction function. If NULL, kfree is used.
+ * @num_pages: Actual number of pages.
+ * @acc_size: Accounted size for this object.
+ * @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.
+ * @persistent_swap_storage: Usually the swap storage is deleted for buffers
+ * pinned in physical memory. If this behaviour is not desired, this member
+ * holds a pointer to a persistent shmem object.
+ * @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.
+ * @lru: List head for the lru list.
+ * @ddestroy: List head for the delayed destroy list.
+ * @swap: List head for swap LRU list.
+ * @moving: Fence set when BO is moving
+ * @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
+ * the driver can usually use the placement offset @offset directly as the
+ * GPU virtual address. For drivers implementing multiple
+ * GPU memory manager contexts, the driver should manage the address space
+ * in these contexts separately and use these objects to get the correct
+ * placement and caching for these GPU maps. This makes it possible to use
+ * these objects for even quite elaborate memory management schemes.
+ * 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_bo_device *bdev;
+	enum ttm_bo_type type;
+	void (*destroy) (struct ttm_buffer_object *);
+	unsigned long num_pages;
+	size_t acc_size;
+
+	/**
+	* Members not needing protection.
+	*/
+	struct kref kref;
+
+	/**
+	 * Members protected by the bo::resv::reserved lock.
+	 */
+
+	struct ttm_resource mem;
+	struct file *persistent_swap_storage;
+	struct ttm_tt *ttm;
+	bool deleted;
+
+	/**
+	 * Members protected by the bdev::lru_lock.
+	 */
+
+	struct list_head lru;
+	struct list_head ddestroy;
+	struct list_head swap;
+
+	/**
+	 * Members protected by a bo reservation.
+	 */
+
+	struct dma_fence *moving;
+	unsigned priority;
+	unsigned pin_count;
+
+	/**
+	 * Special members that are protected by the reserve lock
+	 * and the bo::lock when written to. Can be read with
+	 * either of these locks held.
+	 */
+
+	struct sg_table *sg;
+};
+
+/**
+ * struct ttm_bo_kmap_obj
+ *
+ * @virtual: The current kernel virtual address.
+ * @page: The page when kmap'ing a single page.
+ * @bo_kmap_type: Type of bo_kmap.
+ *
+ * Object describing a kernel mapping. Since a TTM bo may be located
+ * in various memory types with various caching policies, the
+ * 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;
+	struct page *page;
+	enum {
+		ttm_bo_map_iomap        = 1 | TTM_BO_MAP_IOMEM_MASK,
+		ttm_bo_map_vmap         = 2,
+		ttm_bo_map_kmap         = 3,
+		ttm_bo_map_premapped    = 4 | TTM_BO_MAP_IOMEM_MASK,
+	} bo_kmap_type;
+	struct ttm_buffer_object *bo;
+};
+
+/**
+ * struct ttm_operation_ctx
+ *
+ * @interruptible: Sleep interruptible if sleeping.
+ * @no_wait_gpu: Return immediately if the GPU is busy.
+ * @resv: Reservation object to allow reserved evictions with.
+ * @flags: Including the following flags
+ *
+ * Context for TTM operations like changing buffer placement or general memory
+ * allocation.
+ */
+struct ttm_operation_ctx {
+	bool interruptible;
+	bool no_wait_gpu;
+	struct dma_resv *resv;
+	uint64_t bytes_moved;
+	uint32_t flags;
+};
+
+/* Allow eviction of reserved BOs */
+#define TTM_OPT_FLAG_ALLOW_RES_EVICT		0x1
+/* when serving page fault or suspend, allow alloc anyway */
+#define TTM_OPT_FLAG_FORCE_ALLOC		0x2
+
+/**
+ * ttm_bo_get - reference a struct ttm_buffer_object
+ *
+ * @bo: The buffer object.
+ */
+static inline void ttm_bo_get(struct ttm_buffer_object *bo)
+{
+	kref_get(&bo->kref);
+}
+
+/**
+ * ttm_bo_get_unless_zero - reference a struct ttm_buffer_object unless
+ * its refcount has already reached zero.
+ * @bo: The buffer object.
+ *
+ * Used to reference a TTM buffer object in lookups where the object is removed
+ * from the lookup structure during the destructor and for RCU lookups.
+ *
+ * Returns: @bo if the referencing was successful, NULL otherwise.
+ */
+static inline __must_check struct ttm_buffer_object *
+ttm_bo_get_unless_zero(struct ttm_buffer_object *bo)
+{
+	if (!kref_get_unless_zero(&bo->kref))
+		return NULL;
+	return bo;
+}
+
+/**
+ * ttm_bo_wait - wait for buffer idle.
+ *
+ * @bo:  The buffer object.
+ * @interruptible:  Use interruptible wait.
+ * @no_wait:  Return immediately if buffer is busy.
+ *
+ * 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.
+ */
+int ttm_bo_wait(struct ttm_buffer_object *bo, bool interruptible, bool no_wait);
+
+/**
+ * ttm_bo_mem_compat - Check if proposed placement is compatible with a bo
+ *
+ * @placement:  Return immediately if buffer is busy.
+ * @mem:  The struct ttm_resource indicating the region where the bo resides
+ * @new_flags: Describes compatible placement found
+ *
+ * Returns true if the placement is compatible
+ */
+bool ttm_bo_mem_compat(struct ttm_placement *placement, struct ttm_resource *mem,
+		       uint32_t *new_flags);
+
+/**
+ * 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.
+ */
+int ttm_bo_validate(struct ttm_buffer_object *bo,
+		    struct ttm_placement *placement,
+		    struct ttm_operation_ctx *ctx);
+
+/**
+ * ttm_bo_put
+ *
+ * @bo: The buffer object.
+ *
+ * Unreference a buffer object.
+ */
+void ttm_bo_put(struct ttm_buffer_object *bo);
+
+/**
+ * ttm_bo_move_to_lru_tail
+ *
+ * @bo: The buffer object.
+ * @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
+ * 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,
+			     struct ttm_lru_bulk_move *bulk);
+
+/**
+ * ttm_bo_bulk_move_lru_tail
+ *
+ * @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.
+ */
+void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk);
+
+/**
+ * ttm_bo_lock_delayed_workqueue
+ *
+ * Prevent the delayed workqueue from running.
+ * Returns
+ * True if the workqueue was queued at the time
+ */
+int ttm_bo_lock_delayed_workqueue(struct ttm_bo_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);
+
+/**
+ * ttm_bo_eviction_valuable
+ *
+ * @bo: The buffer object to evict
+ * @place: the placement we need to make room for
+ *
+ * Check if it is valuable to evict the BO to make room for the given placement.
+ */
+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,
+			   unsigned long bo_size,
+			   unsigned struct_size);
+
+/**
+ * ttm_bo_init_reserved
+ *
+ * @bdev: Pointer to a ttm_bo_device struct.
+ * @bo: Pointer to a ttm_buffer_object to be initialized.
+ * @size: Requested size of buffer object.
+ * @type: Requested type of buffer object.
+ * @flags: Initial placement flags.
+ * @page_alignment: Data alignment in pages.
+ * @ctx: TTM operation context for memory allocation.
+ * @acc_size: Accounted size for this object.
+ * @resv: Pointer to a dma_resv, or NULL to let ttm allocate one.
+ * @destroy: Destroy function. Use NULL for kfree().
+ *
+ * This function initializes a pre-allocated struct ttm_buffer_object.
+ * As this object may be part of a larger structure, this function,
+ * together with the @destroy function,
+ * enables driver-specific objects derived from a ttm_buffer_object.
+ *
+ * On successful return, the caller owns an object kref to @bo. The kref and
+ * list_kref are usually set to 1, but note that in some situations, other
+ * tasks may already be holding references to @bo as well.
+ * Furthermore, if resv == NULL, the buffer's reservation lock will be held,
+ * and it is the caller's responsibility to call ttm_bo_unreserve.
+ *
+ * If a failure occurs, the function will call the @destroy function, or
+ * kfree() if @destroy is NULL. Thus, after a failure, dereferencing @bo is
+ * illegal and will likely cause memory corruption.
+ *
+ * Returns
+ * -ENOMEM: Out of memory.
+ * -EINVAL: Invalid placement flags.
+ * -ERESTARTSYS: Interrupted by signal while sleeping waiting for resources.
+ */
+
+int ttm_bo_init_reserved(struct ttm_bo_device *bdev,
+			 struct ttm_buffer_object *bo,
+			 unsigned long size,
+			 enum ttm_bo_type type,
+			 struct ttm_placement *placement,
+			 uint32_t page_alignment,
+			 struct ttm_operation_ctx *ctx,
+			 size_t acc_size,
+			 struct sg_table *sg,
+			 struct dma_resv *resv,
+			 void (*destroy) (struct ttm_buffer_object *));
+
+/**
+ * ttm_bo_init
+ *
+ * @bdev: Pointer to a ttm_bo_device struct.
+ * @bo: Pointer to a ttm_buffer_object to be initialized.
+ * @size: Requested size of buffer object.
+ * @type: Requested type of buffer object.
+ * @flags: Initial placement flags.
+ * @page_alignment: Data alignment in pages.
+ * @interruptible: If needing to sleep to wait for GPU resources,
+ * sleep interruptible.
+ * pinned in physical memory. If this behaviour is not desired, this member
+ * holds a pointer to a persistent shmem object. Typically, this would
+ * point to the shmem object backing a GEM object if TTM is used to back a
+ * GEM user interface.
+ * @acc_size: Accounted size for this object.
+ * @resv: Pointer to a dma_resv, or NULL to let ttm allocate one.
+ * @destroy: Destroy function. Use NULL for kfree().
+ *
+ * This function initializes a pre-allocated struct ttm_buffer_object.
+ * As this object may be part of a larger structure, this function,
+ * together with the @destroy function,
+ * enables driver-specific objects derived from a ttm_buffer_object.
+ *
+ * On successful return, the caller owns an object kref to @bo. The kref and
+ * list_kref are usually set to 1, but note that in some situations, other
+ * tasks may already be holding references to @bo as well.
+ *
+ * If a failure occurs, the function will call the @destroy function, or
+ * kfree() if @destroy is NULL. Thus, after a failure, dereferencing @bo is
+ * illegal and will likely cause memory corruption.
+ *
+ * Returns
+ * -ENOMEM: Out of memory.
+ * -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,
+		unsigned long size, enum ttm_bo_type type,
+		struct ttm_placement *placement,
+		uint32_t page_alignment, bool interrubtible, size_t acc_size,
+		struct sg_table *sg, struct dma_resv *resv,
+		void (*destroy) (struct ttm_buffer_object *));
+
+/**
+ * ttm_bo_create
+ *
+ * @bdev: Pointer to a ttm_bo_device struct.
+ * @size: Requested size of buffer object.
+ * @type: Requested type of buffer object.
+ * @placement: Initial placement.
+ * @page_alignment: Data alignment in pages.
+ * @interruptible: If needing to sleep while waiting for GPU resources,
+ * sleep interruptible.
+ * @p_bo: On successful completion *p_bo points to the created object.
+ *
+ * This function allocates a ttm_buffer_object, and then calls ttm_bo_init
+ * on that object. The destroy function is set to kfree().
+ * Returns
+ * -ENOMEM: Out of memory.
+ * -EINVAL: Invalid placement flags.
+ * -ERESTARTSYS: Interrupted by signal while waiting for resources.
+ */
+int ttm_bo_create(struct ttm_bo_device *bdev, unsigned long size,
+		  enum ttm_bo_type type, struct ttm_placement *placement,
+		  uint32_t page_alignment, bool interruptible,
+		  struct ttm_buffer_object **p_bo);
+
+/**
+ * ttm_bo_evict_mm
+ *
+ * @bdev: Pointer to a ttm_bo_device struct.
+ * @mem_type: The memory type.
+ *
+ * Evicts all buffers on the lru list of the memory type.
+ * This is normally part of a VT switch or an
+ * out-of-memory-space-due-to-fragmentation handler.
+ * The caller must make sure that there are no other processes
+ * currently validating buffers, and can do that by taking the
+ * struct ttm_bo_device::ttm_lock in write mode.
+ *
+ * Returns:
+ * -EINVAL: Invalid or uninitialized memory type.
+ * -ERESTARTSYS: The call was interrupted by a signal while waiting to
+ * evict a buffer.
+ */
+int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type);
+
+/**
+ * ttm_kmap_obj_virtual
+ *
+ * @map: A struct ttm_bo_kmap_obj returned from ttm_bo_kmap.
+ * @is_iomem: Pointer to an integer that on return indicates 1 if the
+ * virtual map is io memory, 0 if normal memory.
+ *
+ * Returns the virtual address of a buffer object area mapped by ttm_bo_kmap.
+ * If *is_iomem is 1 on return, the virtual address points to an io memory area,
+ * that should strictly be accessed by the iowriteXX() and similar functions.
+ */
+static inline void *ttm_kmap_obj_virtual(struct ttm_bo_kmap_obj *map,
+					 bool *is_iomem)
+{
+	*is_iomem = !!(map->bo_kmap_type & TTM_BO_MAP_IOMEM_MASK);
+	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_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_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_mmap - mmap out of the ttm device address space.
+ *
+ * @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.
+ *
+ * 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);
+
+/**
+ * ttm_bo_io
+ *
+ * @bdev:      Pointer to the struct ttm_bo_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_bo_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_bo_global *glob,
+			struct ttm_operation_ctx *ctx);
+void ttm_bo_swapout_all(void);
+
+/**
+ * ttm_bo_uses_embedded_gem_object - check if the given bo uses the
+ * embedded drm_gem_object.
+ *
+ * Most ttm drivers are using gem too, so the embedded
+ * ttm_buffer_object.base will be initialized by the driver (before
+ * calling ttm_bo_init).  It is also possible to use ttm without gem
+ * though (vmwgfx does that).
+ *
+ * This helper will figure whenever a given ttm bo is a gem object too
+ * or not.
+ *
+ * @bo: The bo to check.
+ */
+static inline bool ttm_bo_uses_embedded_gem_object(struct ttm_buffer_object *bo)
+{
+	return bo->base.dev != NULL;
+}
+
+/**
+ * ttm_bo_pin - Pin the buffer object.
+ * @bo: The buffer object to pin
+ *
+ * Make sure the buffer is not evicted any more during memory pressure.
+ */
+static inline void ttm_bo_pin(struct ttm_buffer_object *bo)
+{
+	dma_resv_assert_held(bo->base.resv);
+	++bo->pin_count;
+}
+
+/**
+ * ttm_bo_unpin - Unpin the buffer object.
+ * @bo: The buffer object to unpin
+ *
+ * Allows the buffer object to be evicted again during memory pressure.
+ */
+static inline void ttm_bo_unpin(struct ttm_buffer_object *bo)
+{
+	dma_resv_assert_held(bo->base.resv);
+	if (bo->pin_count)
+		--bo->pin_count;
+	else
+		WARN_ON_ONCE(true);
+}
+
+int ttm_mem_evict_first(struct ttm_bo_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,
+				    pgoff_t fault_page_size);
+
+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);
+
+#endif