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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
31#define pr_fmt(fmt) "[TTM] " fmt
32
33#include <linux/sched.h>
34#include <linux/highmem.h>
35#include <linux/pagemap.h>
36#include <linux/shmem_fs.h>
37#include <linux/file.h>
38#include <linux/swap.h>
39#include <linux/slab.h>
40#include <linux/export.h>
41#include <drm/drm_cache.h>
42#include <drm/drm_mem_util.h>
43#include <drm/ttm/ttm_module.h>
44#include <drm/ttm/ttm_bo_driver.h>
45#include <drm/ttm/ttm_placement.h>
46#include <drm/ttm/ttm_page_alloc.h>
47
48/**
49 * Allocates storage for pointers to the pages that back the ttm.
50 */
51static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
52{
53 ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(void*));
54}
55
56static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
57{
58 ttm->ttm.pages = drm_calloc_large(ttm->ttm.num_pages,
59 sizeof(*ttm->ttm.pages) +
60 sizeof(*ttm->dma_address) +
61 sizeof(*ttm->cpu_address));
62 ttm->cpu_address = (void *) (ttm->ttm.pages + ttm->ttm.num_pages);
63 ttm->dma_address = (void *) (ttm->cpu_address + ttm->ttm.num_pages);
64}
65
66#ifdef CONFIG_X86
67static inline int ttm_tt_set_page_caching(struct page *p,
68 enum ttm_caching_state c_old,
69 enum ttm_caching_state c_new)
70{
71 int ret = 0;
72
73 if (PageHighMem(p))
74 return 0;
75
76 if (c_old != tt_cached) {
77 /* p isn't in the default caching state, set it to
78 * writeback first to free its current memtype. */
79
80 ret = set_pages_wb(p, 1);
81 if (ret)
82 return ret;
83 }
84
85 if (c_new == tt_wc)
86 ret = set_memory_wc((unsigned long) page_address(p), 1);
87 else if (c_new == tt_uncached)
88 ret = set_pages_uc(p, 1);
89
90 return ret;
91}
92#else /* CONFIG_X86 */
93static inline int ttm_tt_set_page_caching(struct page *p,
94 enum ttm_caching_state c_old,
95 enum ttm_caching_state c_new)
96{
97 return 0;
98}
99#endif /* CONFIG_X86 */
100
101/*
102 * Change caching policy for the linear kernel map
103 * for range of pages in a ttm.
104 */
105
106static int ttm_tt_set_caching(struct ttm_tt *ttm,
107 enum ttm_caching_state c_state)
108{
109 int i, j;
110 struct page *cur_page;
111 int ret;
112
113 if (ttm->caching_state == c_state)
114 return 0;
115
116 if (ttm->state == tt_unpopulated) {
117 /* Change caching but don't populate */
118 ttm->caching_state = c_state;
119 return 0;
120 }
121
122 if (ttm->caching_state == tt_cached)
123 drm_clflush_pages(ttm->pages, ttm->num_pages);
124
125 for (i = 0; i < ttm->num_pages; ++i) {
126 cur_page = ttm->pages[i];
127 if (likely(cur_page != NULL)) {
128 ret = ttm_tt_set_page_caching(cur_page,
129 ttm->caching_state,
130 c_state);
131 if (unlikely(ret != 0))
132 goto out_err;
133 }
134 }
135
136 ttm->caching_state = c_state;
137
138 return 0;
139
140out_err:
141 for (j = 0; j < i; ++j) {
142 cur_page = ttm->pages[j];
143 if (likely(cur_page != NULL)) {
144 (void)ttm_tt_set_page_caching(cur_page, c_state,
145 ttm->caching_state);
146 }
147 }
148
149 return ret;
150}
151
152int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
153{
154 enum ttm_caching_state state;
155
156 if (placement & TTM_PL_FLAG_WC)
157 state = tt_wc;
158 else if (placement & TTM_PL_FLAG_UNCACHED)
159 state = tt_uncached;
160 else
161 state = tt_cached;
162
163 return ttm_tt_set_caching(ttm, state);
164}
165EXPORT_SYMBOL(ttm_tt_set_placement_caching);
166
167void ttm_tt_destroy(struct ttm_tt *ttm)
168{
169 if (unlikely(ttm == NULL))
170 return;
171
172 if (ttm->state == tt_bound) {
173 ttm_tt_unbind(ttm);
174 }
175
176 if (ttm->state == tt_unbound)
177 ttm_tt_unpopulate(ttm);
178
179 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
180 ttm->swap_storage)
181 fput(ttm->swap_storage);
182
183 ttm->swap_storage = NULL;
184 ttm->func->destroy(ttm);
185}
186
187int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
188 unsigned long size, uint32_t page_flags,
189 struct page *dummy_read_page)
190{
191 ttm->bdev = bdev;
192 ttm->glob = bdev->glob;
193 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
194 ttm->caching_state = tt_cached;
195 ttm->page_flags = page_flags;
196 ttm->dummy_read_page = dummy_read_page;
197 ttm->state = tt_unpopulated;
198 ttm->swap_storage = NULL;
199
200 ttm_tt_alloc_page_directory(ttm);
201 if (!ttm->pages) {
202 ttm_tt_destroy(ttm);
203 pr_err("Failed allocating page table\n");
204 return -ENOMEM;
205 }
206 return 0;
207}
208EXPORT_SYMBOL(ttm_tt_init);
209
210void ttm_tt_fini(struct ttm_tt *ttm)
211{
212 drm_free_large(ttm->pages);
213 ttm->pages = NULL;
214}
215EXPORT_SYMBOL(ttm_tt_fini);
216
217int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
218 unsigned long size, uint32_t page_flags,
219 struct page *dummy_read_page)
220{
221 struct ttm_tt *ttm = &ttm_dma->ttm;
222
223 ttm->bdev = bdev;
224 ttm->glob = bdev->glob;
225 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
226 ttm->caching_state = tt_cached;
227 ttm->page_flags = page_flags;
228 ttm->dummy_read_page = dummy_read_page;
229 ttm->state = tt_unpopulated;
230 ttm->swap_storage = NULL;
231
232 INIT_LIST_HEAD(&ttm_dma->pages_list);
233 ttm_dma_tt_alloc_page_directory(ttm_dma);
234 if (!ttm->pages) {
235 ttm_tt_destroy(ttm);
236 pr_err("Failed allocating page table\n");
237 return -ENOMEM;
238 }
239 return 0;
240}
241EXPORT_SYMBOL(ttm_dma_tt_init);
242
243void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
244{
245 struct ttm_tt *ttm = &ttm_dma->ttm;
246
247 drm_free_large(ttm->pages);
248 ttm->pages = NULL;
249 ttm_dma->cpu_address = NULL;
250 ttm_dma->dma_address = NULL;
251}
252EXPORT_SYMBOL(ttm_dma_tt_fini);
253
254void ttm_tt_unbind(struct ttm_tt *ttm)
255{
256 int ret;
257
258 if (ttm->state == tt_bound) {
259 ret = ttm->func->unbind(ttm);
260 BUG_ON(ret);
261 ttm->state = tt_unbound;
262 }
263}
264
265int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
266{
267 int ret = 0;
268
269 if (!ttm)
270 return -EINVAL;
271
272 if (ttm->state == tt_bound)
273 return 0;
274
275 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
276 if (ret)
277 return ret;
278
279 ret = ttm->func->bind(ttm, bo_mem);
280 if (unlikely(ret != 0))
281 return ret;
282
283 ttm->state = tt_bound;
284
285 return 0;
286}
287EXPORT_SYMBOL(ttm_tt_bind);
288
289int ttm_tt_swapin(struct ttm_tt *ttm)
290{
291 struct address_space *swap_space;
292 struct file *swap_storage;
293 struct page *from_page;
294 struct page *to_page;
295 int i;
296 int ret = -ENOMEM;
297
298 swap_storage = ttm->swap_storage;
299 BUG_ON(swap_storage == NULL);
300
301 swap_space = file_inode(swap_storage)->i_mapping;
302
303 for (i = 0; i < ttm->num_pages; ++i) {
304 from_page = shmem_read_mapping_page(swap_space, i);
305 if (IS_ERR(from_page)) {
306 ret = PTR_ERR(from_page);
307 goto out_err;
308 }
309 to_page = ttm->pages[i];
310 if (unlikely(to_page == NULL))
311 goto out_err;
312
313 copy_highpage(to_page, from_page);
314 put_page(from_page);
315 }
316
317 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
318 fput(swap_storage);
319 ttm->swap_storage = NULL;
320 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
321
322 return 0;
323out_err:
324 return ret;
325}
326
327int ttm_tt_swapout(struct ttm_tt *ttm, struct file *persistent_swap_storage)
328{
329 struct address_space *swap_space;
330 struct file *swap_storage;
331 struct page *from_page;
332 struct page *to_page;
333 int i;
334 int ret = -ENOMEM;
335
336 BUG_ON(ttm->state != tt_unbound && ttm->state != tt_unpopulated);
337 BUG_ON(ttm->caching_state != tt_cached);
338
339 if (!persistent_swap_storage) {
340 swap_storage = shmem_file_setup("ttm swap",
341 ttm->num_pages << PAGE_SHIFT,
342 0);
343 if (IS_ERR(swap_storage)) {
344 pr_err("Failed allocating swap storage\n");
345 return PTR_ERR(swap_storage);
346 }
347 } else
348 swap_storage = persistent_swap_storage;
349
350 swap_space = file_inode(swap_storage)->i_mapping;
351
352 for (i = 0; i < ttm->num_pages; ++i) {
353 from_page = ttm->pages[i];
354 if (unlikely(from_page == NULL))
355 continue;
356 to_page = shmem_read_mapping_page(swap_space, i);
357 if (IS_ERR(to_page)) {
358 ret = PTR_ERR(to_page);
359 goto out_err;
360 }
361 copy_highpage(to_page, from_page);
362 set_page_dirty(to_page);
363 mark_page_accessed(to_page);
364 put_page(to_page);
365 }
366
367 ttm_tt_unpopulate(ttm);
368 ttm->swap_storage = swap_storage;
369 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
370 if (persistent_swap_storage)
371 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP;
372
373 return 0;
374out_err:
375 if (!persistent_swap_storage)
376 fput(swap_storage);
377
378 return ret;
379}
380
381static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
382{
383 pgoff_t i;
384 struct page **page = ttm->pages;
385
386 if (ttm->page_flags & TTM_PAGE_FLAG_SG)
387 return;
388
389 for (i = 0; i < ttm->num_pages; ++i) {
390 (*page)->mapping = NULL;
391 (*page++)->index = 0;
392 }
393}
394
395void ttm_tt_unpopulate(struct ttm_tt *ttm)
396{
397 if (ttm->state == tt_unpopulated)
398 return;
399
400 ttm_tt_clear_mapping(ttm);
401 ttm->bdev->driver->ttm_tt_unpopulate(ttm);
402}
1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
2/**************************************************************************
3 *
4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
25 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28/*
29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
30 */
31
32#define pr_fmt(fmt) "[TTM] " fmt
33
34#include <linux/sched.h>
35#include <linux/pagemap.h>
36#include <linux/shmem_fs.h>
37#include <linux/file.h>
38#include <drm/drm_cache.h>
39#include <drm/ttm/ttm_bo_driver.h>
40
41#include "ttm_module.h"
42
43static unsigned long ttm_pages_limit;
44
45MODULE_PARM_DESC(pages_limit, "Limit for the allocated pages");
46module_param_named(pages_limit, ttm_pages_limit, ulong, 0644);
47
48static unsigned long ttm_dma32_pages_limit;
49
50MODULE_PARM_DESC(dma32_pages_limit, "Limit for the allocated DMA32 pages");
51module_param_named(dma32_pages_limit, ttm_dma32_pages_limit, ulong, 0644);
52
53static atomic_long_t ttm_pages_allocated;
54static atomic_long_t ttm_dma32_pages_allocated;
55
56/*
57 * Allocates a ttm structure for the given BO.
58 */
59int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
60{
61 struct ttm_device *bdev = bo->bdev;
62 uint32_t page_flags = 0;
63
64 dma_resv_assert_held(bo->base.resv);
65
66 if (bo->ttm)
67 return 0;
68
69 switch (bo->type) {
70 case ttm_bo_type_device:
71 if (zero_alloc)
72 page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;
73 break;
74 case ttm_bo_type_kernel:
75 break;
76 case ttm_bo_type_sg:
77 page_flags |= TTM_PAGE_FLAG_SG;
78 break;
79 default:
80 pr_err("Illegal buffer object type\n");
81 return -EINVAL;
82 }
83
84 bo->ttm = bdev->funcs->ttm_tt_create(bo, page_flags);
85 if (unlikely(bo->ttm == NULL))
86 return -ENOMEM;
87
88 return 0;
89}
90
91/*
92 * Allocates storage for pointers to the pages that back the ttm.
93 */
94static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
95{
96 ttm->pages = kvmalloc_array(ttm->num_pages, sizeof(void*),
97 GFP_KERNEL | __GFP_ZERO);
98 if (!ttm->pages)
99 return -ENOMEM;
100 return 0;
101}
102
103static int ttm_dma_tt_alloc_page_directory(struct ttm_tt *ttm)
104{
105 ttm->pages = kvmalloc_array(ttm->num_pages,
106 sizeof(*ttm->pages) +
107 sizeof(*ttm->dma_address),
108 GFP_KERNEL | __GFP_ZERO);
109 if (!ttm->pages)
110 return -ENOMEM;
111
112 ttm->dma_address = (void *)(ttm->pages + ttm->num_pages);
113 return 0;
114}
115
116static int ttm_sg_tt_alloc_page_directory(struct ttm_tt *ttm)
117{
118 ttm->dma_address = kvmalloc_array(ttm->num_pages,
119 sizeof(*ttm->dma_address),
120 GFP_KERNEL | __GFP_ZERO);
121 if (!ttm->dma_address)
122 return -ENOMEM;
123 return 0;
124}
125
126void ttm_tt_destroy_common(struct ttm_device *bdev, struct ttm_tt *ttm)
127{
128 ttm_tt_unpopulate(bdev, ttm);
129
130 if (ttm->swap_storage)
131 fput(ttm->swap_storage);
132
133 ttm->swap_storage = NULL;
134}
135EXPORT_SYMBOL(ttm_tt_destroy_common);
136
137void ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
138{
139 bdev->funcs->ttm_tt_destroy(bdev, ttm);
140}
141
142static void ttm_tt_init_fields(struct ttm_tt *ttm,
143 struct ttm_buffer_object *bo,
144 uint32_t page_flags,
145 enum ttm_caching caching)
146{
147 ttm->num_pages = PAGE_ALIGN(bo->base.size) >> PAGE_SHIFT;
148 ttm->caching = ttm_cached;
149 ttm->page_flags = page_flags;
150 ttm->dma_address = NULL;
151 ttm->swap_storage = NULL;
152 ttm->sg = bo->sg;
153 ttm->caching = caching;
154}
155
156int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
157 uint32_t page_flags, enum ttm_caching caching)
158{
159 ttm_tt_init_fields(ttm, bo, page_flags, caching);
160
161 if (ttm_tt_alloc_page_directory(ttm)) {
162 pr_err("Failed allocating page table\n");
163 return -ENOMEM;
164 }
165 return 0;
166}
167EXPORT_SYMBOL(ttm_tt_init);
168
169void ttm_tt_fini(struct ttm_tt *ttm)
170{
171 if (ttm->pages)
172 kvfree(ttm->pages);
173 else
174 kvfree(ttm->dma_address);
175 ttm->pages = NULL;
176 ttm->dma_address = NULL;
177}
178EXPORT_SYMBOL(ttm_tt_fini);
179
180int ttm_sg_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
181 uint32_t page_flags, enum ttm_caching caching)
182{
183 int ret;
184
185 ttm_tt_init_fields(ttm, bo, page_flags, caching);
186
187 if (page_flags & TTM_PAGE_FLAG_SG)
188 ret = ttm_sg_tt_alloc_page_directory(ttm);
189 else
190 ret = ttm_dma_tt_alloc_page_directory(ttm);
191 if (ret) {
192 pr_err("Failed allocating page table\n");
193 return -ENOMEM;
194 }
195 return 0;
196}
197EXPORT_SYMBOL(ttm_sg_tt_init);
198
199int ttm_tt_swapin(struct ttm_tt *ttm)
200{
201 struct address_space *swap_space;
202 struct file *swap_storage;
203 struct page *from_page;
204 struct page *to_page;
205 gfp_t gfp_mask;
206 int i, ret;
207
208 swap_storage = ttm->swap_storage;
209 BUG_ON(swap_storage == NULL);
210
211 swap_space = swap_storage->f_mapping;
212 gfp_mask = mapping_gfp_mask(swap_space);
213
214 for (i = 0; i < ttm->num_pages; ++i) {
215 from_page = shmem_read_mapping_page_gfp(swap_space, i,
216 gfp_mask);
217 if (IS_ERR(from_page)) {
218 ret = PTR_ERR(from_page);
219 goto out_err;
220 }
221 to_page = ttm->pages[i];
222 if (unlikely(to_page == NULL)) {
223 ret = -ENOMEM;
224 goto out_err;
225 }
226
227 copy_highpage(to_page, from_page);
228 put_page(from_page);
229 }
230
231 fput(swap_storage);
232 ttm->swap_storage = NULL;
233 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
234
235 return 0;
236
237out_err:
238 return ret;
239}
240
241/**
242 * ttm_tt_swapout - swap out tt object
243 *
244 * @bdev: TTM device structure.
245 * @ttm: The struct ttm_tt.
246 * @gfp_flags: Flags to use for memory allocation.
247 *
248 * Swapout a TT object to a shmem_file, return number of pages swapped out or
249 * negative error code.
250 */
251int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
252 gfp_t gfp_flags)
253{
254 loff_t size = (loff_t)ttm->num_pages << PAGE_SHIFT;
255 struct address_space *swap_space;
256 struct file *swap_storage;
257 struct page *from_page;
258 struct page *to_page;
259 int i, ret;
260
261 swap_storage = shmem_file_setup("ttm swap", size, 0);
262 if (IS_ERR(swap_storage)) {
263 pr_err("Failed allocating swap storage\n");
264 return PTR_ERR(swap_storage);
265 }
266
267 swap_space = swap_storage->f_mapping;
268 gfp_flags &= mapping_gfp_mask(swap_space);
269
270 for (i = 0; i < ttm->num_pages; ++i) {
271 from_page = ttm->pages[i];
272 if (unlikely(from_page == NULL))
273 continue;
274
275 to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_flags);
276 if (IS_ERR(to_page)) {
277 ret = PTR_ERR(to_page);
278 goto out_err;
279 }
280 copy_highpage(to_page, from_page);
281 set_page_dirty(to_page);
282 mark_page_accessed(to_page);
283 put_page(to_page);
284 }
285
286 ttm_tt_unpopulate(bdev, ttm);
287 ttm->swap_storage = swap_storage;
288 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
289
290 return ttm->num_pages;
291
292out_err:
293 fput(swap_storage);
294
295 return ret;
296}
297
298static void ttm_tt_add_mapping(struct ttm_device *bdev, struct ttm_tt *ttm)
299{
300 pgoff_t i;
301
302 if (ttm->page_flags & TTM_PAGE_FLAG_SG)
303 return;
304
305 for (i = 0; i < ttm->num_pages; ++i)
306 ttm->pages[i]->mapping = bdev->dev_mapping;
307}
308
309int ttm_tt_populate(struct ttm_device *bdev,
310 struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
311{
312 int ret;
313
314 if (!ttm)
315 return -EINVAL;
316
317 if (ttm_tt_is_populated(ttm))
318 return 0;
319
320 if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) {
321 atomic_long_add(ttm->num_pages, &ttm_pages_allocated);
322 if (bdev->pool.use_dma32)
323 atomic_long_add(ttm->num_pages,
324 &ttm_dma32_pages_allocated);
325 }
326
327 while (atomic_long_read(&ttm_pages_allocated) > ttm_pages_limit ||
328 atomic_long_read(&ttm_dma32_pages_allocated) >
329 ttm_dma32_pages_limit) {
330
331 ret = ttm_global_swapout(ctx, GFP_KERNEL);
332 if (ret == 0)
333 break;
334 if (ret < 0)
335 goto error;
336 }
337
338 if (bdev->funcs->ttm_tt_populate)
339 ret = bdev->funcs->ttm_tt_populate(bdev, ttm, ctx);
340 else
341 ret = ttm_pool_alloc(&bdev->pool, ttm, ctx);
342 if (ret)
343 goto error;
344
345 ttm_tt_add_mapping(bdev, ttm);
346 ttm->page_flags |= TTM_PAGE_FLAG_PRIV_POPULATED;
347 if (unlikely(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
348 ret = ttm_tt_swapin(ttm);
349 if (unlikely(ret != 0)) {
350 ttm_tt_unpopulate(bdev, ttm);
351 return ret;
352 }
353 }
354
355 return 0;
356
357error:
358 if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) {
359 atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
360 if (bdev->pool.use_dma32)
361 atomic_long_sub(ttm->num_pages,
362 &ttm_dma32_pages_allocated);
363 }
364 return ret;
365}
366EXPORT_SYMBOL(ttm_tt_populate);
367
368static void ttm_tt_clear_mapping(struct ttm_tt *ttm)
369{
370 pgoff_t i;
371 struct page **page = ttm->pages;
372
373 if (ttm->page_flags & TTM_PAGE_FLAG_SG)
374 return;
375
376 for (i = 0; i < ttm->num_pages; ++i) {
377 (*page)->mapping = NULL;
378 (*page++)->index = 0;
379 }
380}
381
382void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
383{
384 if (!ttm_tt_is_populated(ttm))
385 return;
386
387 ttm_tt_clear_mapping(ttm);
388 if (bdev->funcs->ttm_tt_unpopulate)
389 bdev->funcs->ttm_tt_unpopulate(bdev, ttm);
390 else
391 ttm_pool_free(&bdev->pool, ttm);
392
393 if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) {
394 atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
395 if (bdev->pool.use_dma32)
396 atomic_long_sub(ttm->num_pages,
397 &ttm_dma32_pages_allocated);
398 }
399
400 ttm->page_flags &= ~TTM_PAGE_FLAG_PRIV_POPULATED;
401}
402
403#ifdef CONFIG_DEBUG_FS
404
405/* Test the shrinker functions and dump the result */
406static int ttm_tt_debugfs_shrink_show(struct seq_file *m, void *data)
407{
408 struct ttm_operation_ctx ctx = { false, false };
409
410 seq_printf(m, "%d\n", ttm_global_swapout(&ctx, GFP_KERNEL));
411 return 0;
412}
413DEFINE_SHOW_ATTRIBUTE(ttm_tt_debugfs_shrink);
414
415#endif
416
417
418/*
419 * ttm_tt_mgr_init - register with the MM shrinker
420 *
421 * Register with the MM shrinker for swapping out BOs.
422 */
423void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages)
424{
425#ifdef CONFIG_DEBUG_FS
426 debugfs_create_file("tt_shrink", 0400, ttm_debugfs_root, NULL,
427 &ttm_tt_debugfs_shrink_fops);
428#endif
429
430 if (!ttm_pages_limit)
431 ttm_pages_limit = num_pages;
432
433 if (!ttm_dma32_pages_limit)
434 ttm_dma32_pages_limit = num_dma32_pages;
435}
436
437static void ttm_kmap_iter_tt_map_local(struct ttm_kmap_iter *iter,
438 struct dma_buf_map *dmap,
439 pgoff_t i)
440{
441 struct ttm_kmap_iter_tt *iter_tt =
442 container_of(iter, typeof(*iter_tt), base);
443
444 dma_buf_map_set_vaddr(dmap, kmap_local_page_prot(iter_tt->tt->pages[i],
445 iter_tt->prot));
446}
447
448static void ttm_kmap_iter_tt_unmap_local(struct ttm_kmap_iter *iter,
449 struct dma_buf_map *map)
450{
451 kunmap_local(map->vaddr);
452}
453
454static const struct ttm_kmap_iter_ops ttm_kmap_iter_tt_ops = {
455 .map_local = ttm_kmap_iter_tt_map_local,
456 .unmap_local = ttm_kmap_iter_tt_unmap_local,
457 .maps_tt = true,
458};
459
460/**
461 * ttm_kmap_iter_tt_init - Initialize a struct ttm_kmap_iter_tt
462 * @iter_tt: The struct ttm_kmap_iter_tt to initialize.
463 * @tt: Struct ttm_tt holding page pointers of the struct ttm_resource.
464 *
465 * Return: Pointer to the embedded struct ttm_kmap_iter.
466 */
467struct ttm_kmap_iter *
468ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt,
469 struct ttm_tt *tt)
470{
471 iter_tt->base.ops = &ttm_kmap_iter_tt_ops;
472 iter_tt->tt = tt;
473 if (tt)
474 iter_tt->prot = ttm_prot_from_caching(tt->caching, PAGE_KERNEL);
475 else
476 iter_tt->prot = PAGE_KERNEL;
477
478 return &iter_tt->base;
479}
480EXPORT_SYMBOL(ttm_kmap_iter_tt_init);