| /************************************************************************** |
| * |
| * 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_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/reservation.h> |
| |
| struct ttm_bo_device; |
| |
| struct drm_mm_node; |
| |
| /** |
| * struct ttm_place |
| * |
| * @fpfn: first valid page frame number to put the object |
| * @lpfn: last valid page frame number to put the object |
| * @flags: memory domain and caching flags for the object |
| * |
| * Structure indicating a possible place to put an object. |
| */ |
| struct ttm_place { |
| unsigned fpfn; |
| unsigned lpfn; |
| uint32_t flags; |
| }; |
| |
| /** |
| * struct ttm_placement |
| * |
| * @num_placement: number of preferred placements |
| * @placement: preferred placements |
| * @num_busy_placement: number of preferred placements when need to evict buffer |
| * @busy_placement: preferred placements when need to evict buffer |
| * |
| * Structure indicating the placement you request for an object. |
| */ |
| struct ttm_placement { |
| unsigned num_placement; |
| const struct ttm_place *placement; |
| unsigned num_busy_placement; |
| const struct ttm_place *busy_placement; |
| }; |
| |
| /** |
| * struct ttm_bus_placement |
| * |
| * @addr: mapped virtual address |
| * @base: bus base address |
| * @is_iomem: is this io memory ? |
| * @size: size in byte |
| * @offset: offset from the base address |
| * @io_reserved_vm: The VM system has a refcount in @io_reserved_count |
| * @io_reserved_count: Refcounting the numbers of callers to ttm_mem_io_reserve |
| * |
| * Structure indicating the bus placement of an object. |
| */ |
| struct ttm_bus_placement { |
| void *addr; |
| phys_addr_t base; |
| unsigned long size; |
| unsigned long offset; |
| bool is_iomem; |
| bool io_reserved_vm; |
| uint64_t io_reserved_count; |
| }; |
| |
| |
| /** |
| * struct ttm_mem_reg |
| * |
| * @mm_node: Memory manager node. |
| * @size: Requested size of memory region. |
| * @num_pages: Actual size of memory region in pages. |
| * @page_alignment: Page alignment. |
| * @placement: Placement flags. |
| * @bus: Placement on io bus accessible to the CPU |
| * |
| * Structure indicating the placement and space resources used by a |
| * buffer object. |
| */ |
| |
| struct ttm_mem_reg { |
| void *mm_node; |
| unsigned long start; |
| unsigned long size; |
| unsigned long num_pages; |
| uint32_t page_alignment; |
| uint32_t mem_type; |
| uint32_t placement; |
| struct ttm_bus_placement bus; |
| }; |
| |
| /** |
| * 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 |
| * |
| * @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 put on the delayed delete list. |
| * @list_kref: List reference count of this buffer object. This member is |
| * used to avoid destruction while the buffer object is still on a list. |
| * Lru lists may keep one refcount, the delayed delete list, and kref != 0 |
| * keeps one refcount. When this refcount reaches zero, |
| * the object is destroyed. |
| * @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. |
| * @cpu_writes: For synchronization. Number of cpu writers. |
| * @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 |
| * @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. |
| * @wu_mutex: Wait unreserved mutex. |
| * |
| * 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 { |
| /** |
| * Members constant at init. |
| */ |
| |
| struct ttm_bo_global *glob; |
| 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; |
| struct kref list_kref; |
| |
| /** |
| * Members protected by the bo::resv::reserved lock. |
| */ |
| |
| struct ttm_mem_reg mem; |
| struct file *persistent_swap_storage; |
| struct ttm_tt *ttm; |
| bool evicted; |
| |
| /** |
| * Members protected by the bo::reserved lock only when written to. |
| */ |
| |
| atomic_t cpu_writers; |
| |
| /** |
| * Members protected by the bdev::lru_lock. |
| */ |
| |
| struct list_head lru; |
| struct list_head ddestroy; |
| struct list_head swap; |
| struct list_head io_reserve_lru; |
| |
| /** |
| * Members protected by a bo reservation. |
| */ |
| |
| struct fence *moving; |
| |
| struct drm_vma_offset_node vma_node; |
| |
| /** |
| * 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. |
| */ |
| |
| uint64_t offset; /* GPU address space is independent of CPU word size */ |
| uint32_t cur_placement; |
| |
| struct sg_table *sg; |
| |
| struct reservation_object *resv; |
| struct reservation_object ttm_resv; |
| struct mutex wu_mutex; |
| }; |
| |
| /** |
| * 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; |
| }; |
| |
| /** |
| * ttm_bo_reference - reference a struct ttm_buffer_object |
| * |
| * @bo: The buffer object. |
| * |
| * Returns a refcounted pointer to a buffer object. |
| */ |
| |
| static inline struct ttm_buffer_object * |
| ttm_bo_reference(struct ttm_buffer_object *bo) |
| { |
| kref_get(&bo->kref); |
| 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. |
| */ |
| extern int ttm_bo_wait(struct ttm_buffer_object *bo, |
| bool interruptible, bool no_wait); |
| /** |
| * ttm_bo_validate |
| * |
| * @bo: The buffer object. |
| * @placement: Proposed placement for the buffer object. |
| * @interruptible: Sleep interruptible if sleeping. |
| * @no_wait_gpu: Return immediately if the GPU is busy. |
| * |
| * 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. |
| */ |
| extern int ttm_bo_validate(struct ttm_buffer_object *bo, |
| struct ttm_placement *placement, |
| bool interruptible, |
| bool no_wait_gpu); |
| |
| /** |
| * ttm_bo_unref |
| * |
| * @bo: The buffer object. |
| * |
| * Unreference and clear a pointer to a buffer object. |
| */ |
| extern void ttm_bo_unref(struct ttm_buffer_object **bo); |
| |
| |
| /** |
| * ttm_bo_list_ref_sub |
| * |
| * @bo: The buffer object. |
| * @count: The number of references with which to decrease @bo::list_kref; |
| * @never_free: The refcount should not reach zero with this operation. |
| * |
| * Release @count lru list references to this buffer object. |
| */ |
| extern void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count, |
| bool never_free); |
| |
| /** |
| * ttm_bo_add_to_lru |
| * |
| * @bo: The buffer object. |
| * |
| * Add this bo to the relevant mem type lru and, if it's backed by |
| * system pages (ttms) to the swap list. |
| * This function must be called with struct ttm_bo_global::lru_lock held, and |
| * is typically called immediately prior to unreserving a bo. |
| */ |
| extern void ttm_bo_add_to_lru(struct ttm_buffer_object *bo); |
| |
| /** |
| * ttm_bo_del_from_lru |
| * |
| * @bo: The buffer object. |
| * |
| * Remove this bo from 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 usually called just immediately after the bo has been reserved to |
| * avoid recursive reservation from lru lists. |
| */ |
| extern int ttm_bo_del_from_lru(struct ttm_buffer_object *bo); |
| |
| /** |
| * ttm_bo_move_to_lru_tail |
| * |
| * @bo: The buffer object. |
| * |
| * 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. |
| */ |
| extern void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo); |
| |
| /** |
| * ttm_bo_lock_delayed_workqueue |
| * |
| * Prevent the delayed workqueue from running. |
| * Returns |
| * True if the workqueue was queued at the time |
| */ |
| extern int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev); |
| |
| /** |
| * ttm_bo_unlock_delayed_workqueue |
| * |
| * Allows the delayed workqueue to run. |
| */ |
| extern void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, |
| int resched); |
| |
| /** |
| * ttm_bo_synccpu_write_grab |
| * |
| * @bo: The buffer object: |
| * @no_wait: Return immediately if buffer is busy. |
| * |
| * Synchronizes a buffer object for CPU RW access. This means |
| * command submission that affects the buffer will return -EBUSY |
| * until ttm_bo_synccpu_write_release is called. |
| * |
| * Returns |
| * -EBUSY if the buffer is busy and no_wait is true. |
| * -ERESTARTSYS if interrupted by a signal. |
| */ |
| extern int |
| ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait); |
| |
| /** |
| * ttm_bo_synccpu_write_release: |
| * |
| * @bo : The buffer object. |
| * |
| * Releases a synccpu lock. |
| */ |
| extern void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo); |
| |
| /** |
| * ttm_bo_acc_size |
| * |
| * @bdev: Pointer to a ttm_bo_device struct. |
| * @bo_size: size of the buffer object in byte. |
| * @struct_size: size of the structure holding buffer object datas |
| * |
| * Returns size to account for a buffer object |
| */ |
| size_t ttm_bo_acc_size(struct ttm_bo_device *bdev, |
| unsigned long bo_size, |
| unsigned struct_size); |
| size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev, |
| unsigned long bo_size, |
| unsigned struct_size); |
| |
| /** |
| * 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. |
| * @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. 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 reservation_object, 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 object kref and list_kref are set to 1. |
| * 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. |
| */ |
| |
| extern 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, |
| struct file *persistent_swap_storage, |
| size_t acc_size, |
| struct sg_table *sg, |
| struct reservation_object *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. |
| * @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. Typically, this would |
| * point to the shmem object backing a GEM object if TTM is used to back a |
| * GEM user interface. |
| * @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. |
| */ |
| |
| extern 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 file *persistent_swap_storage, |
| struct ttm_buffer_object **p_bo); |
| |
| /** |
| * ttm_bo_init_mm |
| * |
| * @bdev: Pointer to a ttm_bo_device struct. |
| * @mem_type: The memory type. |
| * @p_size: size managed area in pages. |
| * |
| * Initialize a manager for a given memory type. |
| * Note: if part of driver firstopen, it must be protected from a |
| * potentially racing lastclose. |
| * Returns: |
| * -EINVAL: invalid size or memory type. |
| * -ENOMEM: Not enough memory. |
| * May also return driver-specified errors. |
| */ |
| |
| extern int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type, |
| unsigned long p_size); |
| /** |
| * ttm_bo_clean_mm |
| * |
| * @bdev: Pointer to a ttm_bo_device struct. |
| * @mem_type: The memory type. |
| * |
| * Take down a manager for a given memory type after first walking |
| * the LRU list to evict any buffers left alive. |
| * |
| * Normally, this function is part of lastclose() or unload(), and at that |
| * point there shouldn't be any buffers left created by user-space, since |
| * there should've been removed by the file descriptor release() method. |
| * However, before this function is run, make sure to signal all sync objects, |
| * and verify that the delayed delete queue is empty. The driver must also |
| * make sure that there are no NO_EVICT buffers present in this memory type |
| * when the call is made. |
| * |
| * If this function is part of a VT switch, the caller must make sure that |
| * there are no appications currently validating buffers before this |
| * function is called. The caller can do that by first taking the |
| * struct ttm_bo_device::ttm_lock in write mode. |
| * |
| * Returns: |
| * -EINVAL: invalid or uninitialized memory type. |
| * -EBUSY: There are still buffers left in this memory type. |
| */ |
| |
| extern int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type); |
| |
| /** |
| * 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. |
| */ |
| |
| extern 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. |
| */ |
| |
| extern 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. |
| */ |
| |
| extern void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map); |
| |
| /** |
| * ttm_fbdev_mmap - mmap fbdev memory backed by a ttm buffer object. |
| * |
| * @vma: vma as input from the fbdev mmap method. |
| * @bo: The bo backing the address space. The address space will |
| * have the same size as the bo, and start at offset 0. |
| * |
| * This function is intended to be called by the fbdev mmap method |
| * if the fbdev address space is to be backed by a bo. |
| */ |
| |
| extern int ttm_fbdev_mmap(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. |
| */ |
| |
| extern 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. |
| */ |
| |
| extern 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); |
| |
| extern void ttm_bo_swapout_all(struct ttm_bo_device *bdev); |
| extern int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo); |
| #endif |