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1/**************************************************************************
2 *
3 * Copyright (c) 2006-2009 Vmware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27/*
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29 */
30#ifndef _TTM_BO_DRIVER_H_
31#define _TTM_BO_DRIVER_H_
32
33#include <drm/drm_mm.h>
34#include <drm/drm_vma_manager.h>
35#include <linux/workqueue.h>
36#include <linux/fs.h>
37#include <linux/spinlock.h>
38#include <linux/dma-resv.h>
39
40#include <drm/ttm/ttm_device.h>
41
42#include "ttm_bo_api.h"
43#include "ttm_kmap_iter.h"
44#include "ttm_placement.h"
45#include "ttm_tt.h"
46#include "ttm_pool.h"
47
48/*
49 * ttm_bo.c
50 */
51
52/**
53 * ttm_bo_mem_space
54 *
55 * @bo: Pointer to a struct ttm_buffer_object. the data of which
56 * we want to allocate space for.
57 * @proposed_placement: Proposed new placement for the buffer object.
58 * @mem: A struct ttm_resource.
59 * @interruptible: Sleep interruptible when sliping.
60 * @no_wait_gpu: Return immediately if the GPU is busy.
61 *
62 * Allocate memory space for the buffer object pointed to by @bo, using
63 * the placement flags in @mem, potentially evicting other idle buffer objects.
64 * This function may sleep while waiting for space to become available.
65 * Returns:
66 * -EBUSY: No space available (only if no_wait == 1).
67 * -ENOMEM: Could not allocate memory for the buffer object, either due to
68 * fragmentation or concurrent allocators.
69 * -ERESTARTSYS: An interruptible sleep was interrupted by a signal.
70 */
71int ttm_bo_mem_space(struct ttm_buffer_object *bo,
72 struct ttm_placement *placement,
73 struct ttm_resource **mem,
74 struct ttm_operation_ctx *ctx);
75
76/**
77 * ttm_bo_unmap_virtual
78 *
79 * @bo: tear down the virtual mappings for this BO
80 */
81void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo);
82
83/**
84 * ttm_bo_reserve:
85 *
86 * @bo: A pointer to a struct ttm_buffer_object.
87 * @interruptible: Sleep interruptible if waiting.
88 * @no_wait: Don't sleep while trying to reserve, rather return -EBUSY.
89 * @ticket: ticket used to acquire the ww_mutex.
90 *
91 * Locks a buffer object for validation. (Or prevents other processes from
92 * locking it for validation), while taking a number of measures to prevent
93 * deadlocks.
94 *
95 * Returns:
96 * -EDEADLK: The reservation may cause a deadlock.
97 * Release all buffer reservations, wait for @bo to become unreserved and
98 * try again.
99 * -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by
100 * a signal. Release all buffer reservations and return to user-space.
101 * -EBUSY: The function needed to sleep, but @no_wait was true
102 * -EALREADY: Bo already reserved using @ticket. This error code will only
103 * be returned if @use_ticket is set to true.
104 */
105static inline int ttm_bo_reserve(struct ttm_buffer_object *bo,
106 bool interruptible, bool no_wait,
107 struct ww_acquire_ctx *ticket)
108{
109 int ret;
110
111 if (no_wait) {
112 bool success;
113 if (WARN_ON(ticket))
114 return -EBUSY;
115
116 success = dma_resv_trylock(bo->base.resv);
117 return success ? 0 : -EBUSY;
118 }
119
120 if (interruptible)
121 ret = dma_resv_lock_interruptible(bo->base.resv, ticket);
122 else
123 ret = dma_resv_lock(bo->base.resv, ticket);
124 if (ret == -EINTR)
125 return -ERESTARTSYS;
126 return ret;
127}
128
129/**
130 * ttm_bo_reserve_slowpath:
131 * @bo: A pointer to a struct ttm_buffer_object.
132 * @interruptible: Sleep interruptible if waiting.
133 * @sequence: Set (@bo)->sequence to this value after lock
134 *
135 * This is called after ttm_bo_reserve returns -EAGAIN and we backed off
136 * from all our other reservations. Because there are no other reservations
137 * held by us, this function cannot deadlock any more.
138 */
139static inline int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
140 bool interruptible,
141 struct ww_acquire_ctx *ticket)
142{
143 if (interruptible) {
144 int ret = dma_resv_lock_slow_interruptible(bo->base.resv,
145 ticket);
146 if (ret == -EINTR)
147 ret = -ERESTARTSYS;
148 return ret;
149 }
150 dma_resv_lock_slow(bo->base.resv, ticket);
151 return 0;
152}
153
154static inline void
155ttm_bo_move_to_lru_tail_unlocked(struct ttm_buffer_object *bo)
156{
157 spin_lock(&bo->bdev->lru_lock);
158 ttm_bo_move_to_lru_tail(bo);
159 spin_unlock(&bo->bdev->lru_lock);
160}
161
162static inline void ttm_bo_assign_mem(struct ttm_buffer_object *bo,
163 struct ttm_resource *new_mem)
164{
165 WARN_ON(bo->resource);
166 bo->resource = new_mem;
167}
168
169/**
170 * ttm_bo_move_null = assign memory for a buffer object.
171 * @bo: The bo to assign the memory to
172 * @new_mem: The memory to be assigned.
173 *
174 * Assign the memory from new_mem to the memory of the buffer object bo.
175 */
176static inline void ttm_bo_move_null(struct ttm_buffer_object *bo,
177 struct ttm_resource *new_mem)
178{
179 ttm_resource_free(bo, &bo->resource);
180 ttm_bo_assign_mem(bo, new_mem);
181}
182
183/**
184 * ttm_bo_unreserve
185 *
186 * @bo: A pointer to a struct ttm_buffer_object.
187 *
188 * Unreserve a previous reservation of @bo.
189 */
190static inline void ttm_bo_unreserve(struct ttm_buffer_object *bo)
191{
192 ttm_bo_move_to_lru_tail_unlocked(bo);
193 dma_resv_unlock(bo->base.resv);
194}
195
196/*
197 * ttm_bo_util.c
198 */
199int ttm_mem_io_reserve(struct ttm_device *bdev,
200 struct ttm_resource *mem);
201void ttm_mem_io_free(struct ttm_device *bdev,
202 struct ttm_resource *mem);
203
204/**
205 * ttm_bo_move_memcpy
206 *
207 * @bo: A pointer to a struct ttm_buffer_object.
208 * @interruptible: Sleep interruptible if waiting.
209 * @no_wait_gpu: Return immediately if the GPU is busy.
210 * @new_mem: struct ttm_resource indicating where to move.
211 *
212 * Fallback move function for a mappable buffer object in mappable memory.
213 * The function will, if successful,
214 * free any old aperture space, and set (@new_mem)->mm_node to NULL,
215 * and update the (@bo)->mem placement flags. If unsuccessful, the old
216 * data remains untouched, and it's up to the caller to free the
217 * memory space indicated by @new_mem.
218 * Returns:
219 * !0: Failure.
220 */
221
222int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
223 struct ttm_operation_ctx *ctx,
224 struct ttm_resource *new_mem);
225
226/**
227 * ttm_bo_move_accel_cleanup.
228 *
229 * @bo: A pointer to a struct ttm_buffer_object.
230 * @fence: A fence object that signals when moving is complete.
231 * @evict: This is an evict move. Don't return until the buffer is idle.
232 * @pipeline: evictions are to be pipelined.
233 * @new_mem: struct ttm_resource indicating where to move.
234 *
235 * Accelerated move function to be called when an accelerated move
236 * has been scheduled. The function will create a new temporary buffer object
237 * representing the old placement, and put the sync object on both buffer
238 * objects. After that the newly created buffer object is unref'd to be
239 * destroyed when the move is complete. This will help pipeline
240 * buffer moves.
241 */
242int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
243 struct dma_fence *fence, bool evict,
244 bool pipeline,
245 struct ttm_resource *new_mem);
246
247/**
248 * ttm_bo_move_sync_cleanup.
249 *
250 * @bo: A pointer to a struct ttm_buffer_object.
251 * @new_mem: struct ttm_resource indicating where to move.
252 *
253 * Special case of ttm_bo_move_accel_cleanup where the bo is guaranteed
254 * by the caller to be idle. Typically used after memcpy buffer moves.
255 */
256void ttm_bo_move_sync_cleanup(struct ttm_buffer_object *bo,
257 struct ttm_resource *new_mem);
258
259/**
260 * ttm_bo_pipeline_gutting.
261 *
262 * @bo: A pointer to a struct ttm_buffer_object.
263 *
264 * Pipelined gutting a BO of its backing store.
265 */
266int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo);
267
268/**
269 * ttm_io_prot
270 *
271 * bo: ttm buffer object
272 * res: ttm resource object
273 * @tmp: Page protection flag for a normal, cached mapping.
274 *
275 * Utility function that returns the pgprot_t that should be used for
276 * setting up a PTE with the caching model indicated by @c_state.
277 */
278pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
279 pgprot_t tmp);
280
281/**
282 * ttm_bo_tt_bind
283 *
284 * Bind the object tt to a memory resource.
285 */
286int ttm_bo_tt_bind(struct ttm_buffer_object *bo, struct ttm_resource *mem);
287
288/**
289 * ttm_bo_tt_destroy.
290 */
291void ttm_bo_tt_destroy(struct ttm_buffer_object *bo);
292
293void ttm_move_memcpy(bool clear,
294 u32 num_pages,
295 struct ttm_kmap_iter *dst_iter,
296 struct ttm_kmap_iter *src_iter);
297
298struct ttm_kmap_iter *
299ttm_kmap_iter_iomap_init(struct ttm_kmap_iter_iomap *iter_io,
300 struct io_mapping *iomap,
301 struct sg_table *st,
302 resource_size_t start);
303#endif