1 /**************************************************************************
3 * Copyright (c) 2006-2009 Vmware, Inc., Palo Alto, CA., USA
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
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11 * permit persons to whom the Software is furnished to do so, subject to
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26 **************************************************************************/
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
30 #ifndef _TTM_BO_DRIVER_H_
31 #define _TTM_BO_DRIVER_H_
33 #include <drm/drm_mm.h>
34 #include <drm/drm_vma_manager.h>
35 #include <linux/workqueue.h>
37 #include <linux/spinlock.h>
38 #include <linux/dma-resv.h>
40 #include <drm/ttm/ttm_device.h>
42 #include "ttm_bo_api.h"
43 #include "ttm_kmap_iter.h"
44 #include "ttm_placement.h"
49 * struct ttm_lru_bulk_move_pos
51 * @first: first BO in the bulk move range
52 * @last: last BO in the bulk move range
54 * Positions for a lru bulk move.
56 struct ttm_lru_bulk_move_pos {
57 struct ttm_buffer_object *first;
58 struct ttm_buffer_object *last;
62 * struct ttm_lru_bulk_move
64 * @tt: first/last lru entry for BOs in the TT domain
65 * @vram: first/last lru entry for BOs in the VRAM domain
66 * @swap: first/last lru entry for BOs on the swap list
68 * Helper structure for bulk moves on the LRU list.
70 struct ttm_lru_bulk_move {
71 struct ttm_lru_bulk_move_pos tt[TTM_MAX_BO_PRIORITY];
72 struct ttm_lru_bulk_move_pos vram[TTM_MAX_BO_PRIORITY];
82 * @bo: Pointer to a struct ttm_buffer_object. the data of which
83 * we want to allocate space for.
84 * @proposed_placement: Proposed new placement for the buffer object.
85 * @mem: A struct ttm_resource.
86 * @interruptible: Sleep interruptible when sliping.
87 * @no_wait_gpu: Return immediately if the GPU is busy.
89 * Allocate memory space for the buffer object pointed to by @bo, using
90 * the placement flags in @mem, potentially evicting other idle buffer objects.
91 * This function may sleep while waiting for space to become available.
93 * -EBUSY: No space available (only if no_wait == 1).
94 * -ENOMEM: Could not allocate memory for the buffer object, either due to
95 * fragmentation or concurrent allocators.
96 * -ERESTARTSYS: An interruptible sleep was interrupted by a signal.
98 int ttm_bo_mem_space(struct ttm_buffer_object *bo,
99 struct ttm_placement *placement,
100 struct ttm_resource **mem,
101 struct ttm_operation_ctx *ctx);
104 * ttm_bo_unmap_virtual
106 * @bo: tear down the virtual mappings for this BO
108 void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo);
113 * @bo: A pointer to a struct ttm_buffer_object.
114 * @interruptible: Sleep interruptible if waiting.
115 * @no_wait: Don't sleep while trying to reserve, rather return -EBUSY.
116 * @ticket: ticket used to acquire the ww_mutex.
118 * Locks a buffer object for validation. (Or prevents other processes from
119 * locking it for validation), while taking a number of measures to prevent
123 * -EDEADLK: The reservation may cause a deadlock.
124 * Release all buffer reservations, wait for @bo to become unreserved and
126 * -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by
127 * a signal. Release all buffer reservations and return to user-space.
128 * -EBUSY: The function needed to sleep, but @no_wait was true
129 * -EALREADY: Bo already reserved using @ticket. This error code will only
130 * be returned if @use_ticket is set to true.
132 static inline int ttm_bo_reserve(struct ttm_buffer_object *bo,
133 bool interruptible, bool no_wait,
134 struct ww_acquire_ctx *ticket)
143 success = dma_resv_trylock(bo->base.resv);
144 return success ? 0 : -EBUSY;
148 ret = dma_resv_lock_interruptible(bo->base.resv, ticket);
150 ret = dma_resv_lock(bo->base.resv, ticket);
157 * ttm_bo_reserve_slowpath:
158 * @bo: A pointer to a struct ttm_buffer_object.
159 * @interruptible: Sleep interruptible if waiting.
160 * @sequence: Set (@bo)->sequence to this value after lock
162 * This is called after ttm_bo_reserve returns -EAGAIN and we backed off
163 * from all our other reservations. Because there are no other reservations
164 * held by us, this function cannot deadlock any more.
166 static inline int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
168 struct ww_acquire_ctx *ticket)
171 int ret = dma_resv_lock_slow_interruptible(bo->base.resv,
177 dma_resv_lock_slow(bo->base.resv, ticket);
182 ttm_bo_move_to_lru_tail_unlocked(struct ttm_buffer_object *bo)
184 spin_lock(&bo->bdev->lru_lock);
185 ttm_bo_move_to_lru_tail(bo, bo->resource, NULL);
186 spin_unlock(&bo->bdev->lru_lock);
189 static inline void ttm_bo_assign_mem(struct ttm_buffer_object *bo,
190 struct ttm_resource *new_mem)
192 WARN_ON(bo->resource);
193 bo->resource = new_mem;
197 * ttm_bo_move_null = assign memory for a buffer object.
198 * @bo: The bo to assign the memory to
199 * @new_mem: The memory to be assigned.
201 * Assign the memory from new_mem to the memory of the buffer object bo.
203 static inline void ttm_bo_move_null(struct ttm_buffer_object *bo,
204 struct ttm_resource *new_mem)
206 ttm_resource_free(bo, &bo->resource);
207 ttm_bo_assign_mem(bo, new_mem);
213 * @bo: A pointer to a struct ttm_buffer_object.
215 * Unreserve a previous reservation of @bo.
217 static inline void ttm_bo_unreserve(struct ttm_buffer_object *bo)
219 ttm_bo_move_to_lru_tail_unlocked(bo);
220 dma_resv_unlock(bo->base.resv);
226 int ttm_mem_io_reserve(struct ttm_device *bdev,
227 struct ttm_resource *mem);
228 void ttm_mem_io_free(struct ttm_device *bdev,
229 struct ttm_resource *mem);
234 * @bo: A pointer to a struct ttm_buffer_object.
235 * @interruptible: Sleep interruptible if waiting.
236 * @no_wait_gpu: Return immediately if the GPU is busy.
237 * @new_mem: struct ttm_resource indicating where to move.
239 * Fallback move function for a mappable buffer object in mappable memory.
240 * The function will, if successful,
241 * free any old aperture space, and set (@new_mem)->mm_node to NULL,
242 * and update the (@bo)->mem placement flags. If unsuccessful, the old
243 * data remains untouched, and it's up to the caller to free the
244 * memory space indicated by @new_mem.
249 int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
250 struct ttm_operation_ctx *ctx,
251 struct ttm_resource *new_mem);
254 * ttm_bo_move_accel_cleanup.
256 * @bo: A pointer to a struct ttm_buffer_object.
257 * @fence: A fence object that signals when moving is complete.
258 * @evict: This is an evict move. Don't return until the buffer is idle.
259 * @pipeline: evictions are to be pipelined.
260 * @new_mem: struct ttm_resource indicating where to move.
262 * Accelerated move function to be called when an accelerated move
263 * has been scheduled. The function will create a new temporary buffer object
264 * representing the old placement, and put the sync object on both buffer
265 * objects. After that the newly created buffer object is unref'd to be
266 * destroyed when the move is complete. This will help pipeline
269 int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
270 struct dma_fence *fence, bool evict,
272 struct ttm_resource *new_mem);
275 * ttm_bo_move_accel_cleanup.
277 * @bo: A pointer to a struct ttm_buffer_object.
278 * @new_mem: struct ttm_resource indicating where to move.
280 * Special case of ttm_bo_move_accel_cleanup where the bo is guaranteed
281 * by the caller to be idle. Typically used after memcpy buffer moves.
283 static inline void ttm_bo_move_sync_cleanup(struct ttm_buffer_object *bo,
284 struct ttm_resource *new_mem)
286 int ret = ttm_bo_move_accel_cleanup(bo, NULL, true, false, new_mem);
292 * ttm_bo_pipeline_gutting.
294 * @bo: A pointer to a struct ttm_buffer_object.
296 * Pipelined gutting a BO of its backing store.
298 int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo);
303 * bo: ttm buffer object
304 * res: ttm resource object
305 * @tmp: Page protection flag for a normal, cached mapping.
307 * Utility function that returns the pgprot_t that should be used for
308 * setting up a PTE with the caching model indicated by @c_state.
310 pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
316 * Bind the object tt to a memory resource.
318 int ttm_bo_tt_bind(struct ttm_buffer_object *bo, struct ttm_resource *mem);
323 void ttm_bo_tt_destroy(struct ttm_buffer_object *bo);
325 void ttm_move_memcpy(struct ttm_buffer_object *bo,
327 struct ttm_kmap_iter *dst_iter,
328 struct ttm_kmap_iter *src_iter);
330 struct ttm_kmap_iter *
331 ttm_kmap_iter_iomap_init(struct ttm_kmap_iter_iomap *iter_io,
332 struct io_mapping *iomap,
334 resource_size_t start);