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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/shmem_fs.h>
36#include <linux/file.h>
37#include <linux/module.h>
38#include <drm/drm_cache.h>
39#include <drm/ttm/ttm_bo.h>
40#include <drm/ttm/ttm_tt.h>
41
42#include "ttm_module.h"
43
44static unsigned long ttm_pages_limit;
45
46MODULE_PARM_DESC(pages_limit, "Limit for the allocated pages");
47module_param_named(pages_limit, ttm_pages_limit, ulong, 0644);
48
49static unsigned long ttm_dma32_pages_limit;
50
51MODULE_PARM_DESC(dma32_pages_limit, "Limit for the allocated DMA32 pages");
52module_param_named(dma32_pages_limit, ttm_dma32_pages_limit, ulong, 0644);
53
54static atomic_long_t ttm_pages_allocated;
55static atomic_long_t ttm_dma32_pages_allocated;
56
57/*
58 * Allocates a ttm structure for the given BO.
59 */
60int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
61{
62 struct ttm_device *bdev = bo->bdev;
63 uint32_t page_flags = 0;
64
65 dma_resv_assert_held(bo->base.resv);
66
67 if (bo->ttm)
68 return 0;
69
70 switch (bo->type) {
71 case ttm_bo_type_device:
72 if (zero_alloc)
73 page_flags |= TTM_TT_FLAG_ZERO_ALLOC;
74 break;
75 case ttm_bo_type_kernel:
76 break;
77 case ttm_bo_type_sg:
78 page_flags |= TTM_TT_FLAG_EXTERNAL;
79 break;
80 default:
81 pr_err("Illegal buffer object type\n");
82 return -EINVAL;
83 }
84
85 bo->ttm = bdev->funcs->ttm_tt_create(bo, page_flags);
86 if (unlikely(bo->ttm == NULL))
87 return -ENOMEM;
88
89 WARN_ON(bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL_MAPPABLE &&
90 !(bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL));
91
92 return 0;
93}
94
95/*
96 * Allocates storage for pointers to the pages that back the ttm.
97 */
98static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
99{
100 ttm->pages = kvcalloc(ttm->num_pages, sizeof(void*), GFP_KERNEL);
101 if (!ttm->pages)
102 return -ENOMEM;
103
104 return 0;
105}
106
107static int ttm_dma_tt_alloc_page_directory(struct ttm_tt *ttm)
108{
109 ttm->pages = kvcalloc(ttm->num_pages, sizeof(*ttm->pages) +
110 sizeof(*ttm->dma_address), GFP_KERNEL);
111 if (!ttm->pages)
112 return -ENOMEM;
113
114 ttm->dma_address = (void *)(ttm->pages + ttm->num_pages);
115 return 0;
116}
117
118static int ttm_sg_tt_alloc_page_directory(struct ttm_tt *ttm)
119{
120 ttm->dma_address = kvcalloc(ttm->num_pages, sizeof(*ttm->dma_address),
121 GFP_KERNEL);
122 if (!ttm->dma_address)
123 return -ENOMEM;
124
125 return 0;
126}
127
128void ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
129{
130 bdev->funcs->ttm_tt_destroy(bdev, ttm);
131}
132
133static void ttm_tt_init_fields(struct ttm_tt *ttm,
134 struct ttm_buffer_object *bo,
135 uint32_t page_flags,
136 enum ttm_caching caching,
137 unsigned long extra_pages)
138{
139 ttm->num_pages = (PAGE_ALIGN(bo->base.size) >> PAGE_SHIFT) + extra_pages;
140 ttm->page_flags = page_flags;
141 ttm->dma_address = NULL;
142 ttm->swap_storage = NULL;
143 ttm->sg = bo->sg;
144 ttm->caching = caching;
145}
146
147int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
148 uint32_t page_flags, enum ttm_caching caching,
149 unsigned long extra_pages)
150{
151 ttm_tt_init_fields(ttm, bo, page_flags, caching, extra_pages);
152
153 if (ttm_tt_alloc_page_directory(ttm)) {
154 pr_err("Failed allocating page table\n");
155 return -ENOMEM;
156 }
157 return 0;
158}
159EXPORT_SYMBOL(ttm_tt_init);
160
161void ttm_tt_fini(struct ttm_tt *ttm)
162{
163 WARN_ON(ttm->page_flags & TTM_TT_FLAG_PRIV_POPULATED);
164
165 if (ttm->swap_storage)
166 fput(ttm->swap_storage);
167 ttm->swap_storage = NULL;
168
169 if (ttm->pages)
170 kvfree(ttm->pages);
171 else
172 kvfree(ttm->dma_address);
173 ttm->pages = NULL;
174 ttm->dma_address = NULL;
175}
176EXPORT_SYMBOL(ttm_tt_fini);
177
178int ttm_sg_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
179 uint32_t page_flags, enum ttm_caching caching)
180{
181 int ret;
182
183 ttm_tt_init_fields(ttm, bo, page_flags, caching, 0);
184
185 if (page_flags & TTM_TT_FLAG_EXTERNAL)
186 ret = ttm_sg_tt_alloc_page_directory(ttm);
187 else
188 ret = ttm_dma_tt_alloc_page_directory(ttm);
189 if (ret) {
190 pr_err("Failed allocating page table\n");
191 return -ENOMEM;
192 }
193 return 0;
194}
195EXPORT_SYMBOL(ttm_sg_tt_init);
196
197int ttm_tt_swapin(struct ttm_tt *ttm)
198{
199 struct address_space *swap_space;
200 struct file *swap_storage;
201 struct page *from_page;
202 struct page *to_page;
203 gfp_t gfp_mask;
204 int i, ret;
205
206 swap_storage = ttm->swap_storage;
207 BUG_ON(swap_storage == NULL);
208
209 swap_space = swap_storage->f_mapping;
210 gfp_mask = mapping_gfp_mask(swap_space);
211
212 for (i = 0; i < ttm->num_pages; ++i) {
213 from_page = shmem_read_mapping_page_gfp(swap_space, i,
214 gfp_mask);
215 if (IS_ERR(from_page)) {
216 ret = PTR_ERR(from_page);
217 goto out_err;
218 }
219 to_page = ttm->pages[i];
220 if (unlikely(to_page == NULL)) {
221 ret = -ENOMEM;
222 goto out_err;
223 }
224
225 copy_highpage(to_page, from_page);
226 put_page(from_page);
227 }
228
229 fput(swap_storage);
230 ttm->swap_storage = NULL;
231 ttm->page_flags &= ~TTM_TT_FLAG_SWAPPED;
232
233 return 0;
234
235out_err:
236 return ret;
237}
238
239/**
240 * ttm_tt_swapout - swap out tt object
241 *
242 * @bdev: TTM device structure.
243 * @ttm: The struct ttm_tt.
244 * @gfp_flags: Flags to use for memory allocation.
245 *
246 * Swapout a TT object to a shmem_file, return number of pages swapped out or
247 * negative error code.
248 */
249int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
250 gfp_t gfp_flags)
251{
252 loff_t size = (loff_t)ttm->num_pages << PAGE_SHIFT;
253 struct address_space *swap_space;
254 struct file *swap_storage;
255 struct page *from_page;
256 struct page *to_page;
257 int i, ret;
258
259 swap_storage = shmem_file_setup("ttm swap", size, 0);
260 if (IS_ERR(swap_storage)) {
261 pr_err("Failed allocating swap storage\n");
262 return PTR_ERR(swap_storage);
263 }
264
265 swap_space = swap_storage->f_mapping;
266 gfp_flags &= mapping_gfp_mask(swap_space);
267
268 for (i = 0; i < ttm->num_pages; ++i) {
269 from_page = ttm->pages[i];
270 if (unlikely(from_page == NULL))
271 continue;
272
273 to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_flags);
274 if (IS_ERR(to_page)) {
275 ret = PTR_ERR(to_page);
276 goto out_err;
277 }
278 copy_highpage(to_page, from_page);
279 set_page_dirty(to_page);
280 mark_page_accessed(to_page);
281 put_page(to_page);
282 }
283
284 ttm_tt_unpopulate(bdev, ttm);
285 ttm->swap_storage = swap_storage;
286 ttm->page_flags |= TTM_TT_FLAG_SWAPPED;
287
288 return ttm->num_pages;
289
290out_err:
291 fput(swap_storage);
292
293 return ret;
294}
295
296int ttm_tt_populate(struct ttm_device *bdev,
297 struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
298{
299 int ret;
300
301 if (!ttm)
302 return -EINVAL;
303
304 if (ttm_tt_is_populated(ttm))
305 return 0;
306
307 if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
308 atomic_long_add(ttm->num_pages, &ttm_pages_allocated);
309 if (bdev->pool.use_dma32)
310 atomic_long_add(ttm->num_pages,
311 &ttm_dma32_pages_allocated);
312 }
313
314 while (atomic_long_read(&ttm_pages_allocated) > ttm_pages_limit ||
315 atomic_long_read(&ttm_dma32_pages_allocated) >
316 ttm_dma32_pages_limit) {
317
318 ret = ttm_global_swapout(ctx, GFP_KERNEL);
319 if (ret == 0)
320 break;
321 if (ret < 0)
322 goto error;
323 }
324
325 if (bdev->funcs->ttm_tt_populate)
326 ret = bdev->funcs->ttm_tt_populate(bdev, ttm, ctx);
327 else
328 ret = ttm_pool_alloc(&bdev->pool, ttm, ctx);
329 if (ret)
330 goto error;
331
332 ttm->page_flags |= TTM_TT_FLAG_PRIV_POPULATED;
333 if (unlikely(ttm->page_flags & TTM_TT_FLAG_SWAPPED)) {
334 ret = ttm_tt_swapin(ttm);
335 if (unlikely(ret != 0)) {
336 ttm_tt_unpopulate(bdev, ttm);
337 return ret;
338 }
339 }
340
341 return 0;
342
343error:
344 if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
345 atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
346 if (bdev->pool.use_dma32)
347 atomic_long_sub(ttm->num_pages,
348 &ttm_dma32_pages_allocated);
349 }
350 return ret;
351}
352EXPORT_SYMBOL(ttm_tt_populate);
353
354void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
355{
356 if (!ttm_tt_is_populated(ttm))
357 return;
358
359 if (bdev->funcs->ttm_tt_unpopulate)
360 bdev->funcs->ttm_tt_unpopulate(bdev, ttm);
361 else
362 ttm_pool_free(&bdev->pool, ttm);
363
364 if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
365 atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
366 if (bdev->pool.use_dma32)
367 atomic_long_sub(ttm->num_pages,
368 &ttm_dma32_pages_allocated);
369 }
370
371 ttm->page_flags &= ~TTM_TT_FLAG_PRIV_POPULATED;
372}
373
374#ifdef CONFIG_DEBUG_FS
375
376/* Test the shrinker functions and dump the result */
377static int ttm_tt_debugfs_shrink_show(struct seq_file *m, void *data)
378{
379 struct ttm_operation_ctx ctx = { false, false };
380
381 seq_printf(m, "%d\n", ttm_global_swapout(&ctx, GFP_KERNEL));
382 return 0;
383}
384DEFINE_SHOW_ATTRIBUTE(ttm_tt_debugfs_shrink);
385
386#endif
387
388
389/*
390 * ttm_tt_mgr_init - register with the MM shrinker
391 *
392 * Register with the MM shrinker for swapping out BOs.
393 */
394void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages)
395{
396#ifdef CONFIG_DEBUG_FS
397 debugfs_create_file("tt_shrink", 0400, ttm_debugfs_root, NULL,
398 &ttm_tt_debugfs_shrink_fops);
399#endif
400
401 if (!ttm_pages_limit)
402 ttm_pages_limit = num_pages;
403
404 if (!ttm_dma32_pages_limit)
405 ttm_dma32_pages_limit = num_dma32_pages;
406}
407
408static void ttm_kmap_iter_tt_map_local(struct ttm_kmap_iter *iter,
409 struct iosys_map *dmap,
410 pgoff_t i)
411{
412 struct ttm_kmap_iter_tt *iter_tt =
413 container_of(iter, typeof(*iter_tt), base);
414
415 iosys_map_set_vaddr(dmap, kmap_local_page_prot(iter_tt->tt->pages[i],
416 iter_tt->prot));
417}
418
419static void ttm_kmap_iter_tt_unmap_local(struct ttm_kmap_iter *iter,
420 struct iosys_map *map)
421{
422 kunmap_local(map->vaddr);
423}
424
425static const struct ttm_kmap_iter_ops ttm_kmap_iter_tt_ops = {
426 .map_local = ttm_kmap_iter_tt_map_local,
427 .unmap_local = ttm_kmap_iter_tt_unmap_local,
428 .maps_tt = true,
429};
430
431/**
432 * ttm_kmap_iter_tt_init - Initialize a struct ttm_kmap_iter_tt
433 * @iter_tt: The struct ttm_kmap_iter_tt to initialize.
434 * @tt: Struct ttm_tt holding page pointers of the struct ttm_resource.
435 *
436 * Return: Pointer to the embedded struct ttm_kmap_iter.
437 */
438struct ttm_kmap_iter *
439ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt,
440 struct ttm_tt *tt)
441{
442 iter_tt->base.ops = &ttm_kmap_iter_tt_ops;
443 iter_tt->tt = tt;
444 if (tt)
445 iter_tt->prot = ttm_prot_from_caching(tt->caching, PAGE_KERNEL);
446 else
447 iter_tt->prot = PAGE_KERNEL;
448
449 return &iter_tt->base;
450}
451EXPORT_SYMBOL(ttm_kmap_iter_tt_init);
452
453unsigned long ttm_tt_pages_limit(void)
454{
455 return ttm_pages_limit;
456}
457EXPORT_SYMBOL(ttm_tt_pages_limit);
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/cc_platform.h>
35#include <linux/debugfs.h>
36#include <linux/file.h>
37#include <linux/module.h>
38#include <linux/sched.h>
39#include <linux/shmem_fs.h>
40#include <drm/drm_cache.h>
41#include <drm/drm_device.h>
42#include <drm/drm_util.h>
43#include <drm/ttm/ttm_bo.h>
44#include <drm/ttm/ttm_tt.h>
45
46#include "ttm_module.h"
47
48static unsigned long ttm_pages_limit;
49
50MODULE_PARM_DESC(pages_limit, "Limit for the allocated pages");
51module_param_named(pages_limit, ttm_pages_limit, ulong, 0644);
52
53static unsigned long ttm_dma32_pages_limit;
54
55MODULE_PARM_DESC(dma32_pages_limit, "Limit for the allocated DMA32 pages");
56module_param_named(dma32_pages_limit, ttm_dma32_pages_limit, ulong, 0644);
57
58static atomic_long_t ttm_pages_allocated;
59static atomic_long_t ttm_dma32_pages_allocated;
60
61/*
62 * Allocates a ttm structure for the given BO.
63 */
64int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
65{
66 struct ttm_device *bdev = bo->bdev;
67 struct drm_device *ddev = bo->base.dev;
68 uint32_t page_flags = 0;
69
70 dma_resv_assert_held(bo->base.resv);
71
72 if (bo->ttm)
73 return 0;
74
75 switch (bo->type) {
76 case ttm_bo_type_device:
77 if (zero_alloc)
78 page_flags |= TTM_TT_FLAG_ZERO_ALLOC;
79 break;
80 case ttm_bo_type_kernel:
81 break;
82 case ttm_bo_type_sg:
83 page_flags |= TTM_TT_FLAG_EXTERNAL;
84 break;
85 default:
86 pr_err("Illegal buffer object type\n");
87 return -EINVAL;
88 }
89 /*
90 * When using dma_alloc_coherent with memory encryption the
91 * mapped TT pages need to be decrypted or otherwise the drivers
92 * will end up sending encrypted mem to the gpu.
93 */
94 if (bdev->pool.use_dma_alloc && cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) {
95 page_flags |= TTM_TT_FLAG_DECRYPTED;
96 drm_info_once(ddev, "TT memory decryption enabled.");
97 }
98
99 bo->ttm = bdev->funcs->ttm_tt_create(bo, page_flags);
100 if (unlikely(bo->ttm == NULL))
101 return -ENOMEM;
102
103 WARN_ON(bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL_MAPPABLE &&
104 !(bo->ttm->page_flags & TTM_TT_FLAG_EXTERNAL));
105
106 return 0;
107}
108EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_create);
109
110/*
111 * Allocates storage for pointers to the pages that back the ttm.
112 */
113static int ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
114{
115 ttm->pages = kvcalloc(ttm->num_pages, sizeof(void*), GFP_KERNEL);
116 if (!ttm->pages)
117 return -ENOMEM;
118
119 return 0;
120}
121
122static int ttm_dma_tt_alloc_page_directory(struct ttm_tt *ttm)
123{
124 ttm->pages = kvcalloc(ttm->num_pages, sizeof(*ttm->pages) +
125 sizeof(*ttm->dma_address), GFP_KERNEL);
126 if (!ttm->pages)
127 return -ENOMEM;
128
129 ttm->dma_address = (void *)(ttm->pages + ttm->num_pages);
130 return 0;
131}
132
133static int ttm_sg_tt_alloc_page_directory(struct ttm_tt *ttm)
134{
135 ttm->dma_address = kvcalloc(ttm->num_pages, sizeof(*ttm->dma_address),
136 GFP_KERNEL);
137 if (!ttm->dma_address)
138 return -ENOMEM;
139
140 return 0;
141}
142
143void ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
144{
145 bdev->funcs->ttm_tt_destroy(bdev, ttm);
146}
147EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_destroy);
148
149static void ttm_tt_init_fields(struct ttm_tt *ttm,
150 struct ttm_buffer_object *bo,
151 uint32_t page_flags,
152 enum ttm_caching caching,
153 unsigned long extra_pages)
154{
155 ttm->num_pages = (PAGE_ALIGN(bo->base.size) >> PAGE_SHIFT) + extra_pages;
156 ttm->page_flags = page_flags;
157 ttm->dma_address = NULL;
158 ttm->swap_storage = NULL;
159 ttm->sg = bo->sg;
160 ttm->caching = caching;
161}
162
163int ttm_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
164 uint32_t page_flags, enum ttm_caching caching,
165 unsigned long extra_pages)
166{
167 ttm_tt_init_fields(ttm, bo, page_flags, caching, extra_pages);
168
169 if (ttm_tt_alloc_page_directory(ttm)) {
170 pr_err("Failed allocating page table\n");
171 return -ENOMEM;
172 }
173 return 0;
174}
175EXPORT_SYMBOL(ttm_tt_init);
176
177void ttm_tt_fini(struct ttm_tt *ttm)
178{
179 WARN_ON(ttm->page_flags & TTM_TT_FLAG_PRIV_POPULATED);
180
181 if (ttm->swap_storage)
182 fput(ttm->swap_storage);
183 ttm->swap_storage = NULL;
184
185 if (ttm->pages)
186 kvfree(ttm->pages);
187 else
188 kvfree(ttm->dma_address);
189 ttm->pages = NULL;
190 ttm->dma_address = NULL;
191}
192EXPORT_SYMBOL(ttm_tt_fini);
193
194int ttm_sg_tt_init(struct ttm_tt *ttm, struct ttm_buffer_object *bo,
195 uint32_t page_flags, enum ttm_caching caching)
196{
197 int ret;
198
199 ttm_tt_init_fields(ttm, bo, page_flags, caching, 0);
200
201 if (page_flags & TTM_TT_FLAG_EXTERNAL)
202 ret = ttm_sg_tt_alloc_page_directory(ttm);
203 else
204 ret = ttm_dma_tt_alloc_page_directory(ttm);
205 if (ret) {
206 pr_err("Failed allocating page table\n");
207 return -ENOMEM;
208 }
209 return 0;
210}
211EXPORT_SYMBOL(ttm_sg_tt_init);
212
213int ttm_tt_swapin(struct ttm_tt *ttm)
214{
215 struct address_space *swap_space;
216 struct file *swap_storage;
217 struct page *from_page;
218 struct page *to_page;
219 gfp_t gfp_mask;
220 int i, ret;
221
222 swap_storage = ttm->swap_storage;
223 BUG_ON(swap_storage == NULL);
224
225 swap_space = swap_storage->f_mapping;
226 gfp_mask = mapping_gfp_mask(swap_space);
227
228 for (i = 0; i < ttm->num_pages; ++i) {
229 from_page = shmem_read_mapping_page_gfp(swap_space, i,
230 gfp_mask);
231 if (IS_ERR(from_page)) {
232 ret = PTR_ERR(from_page);
233 goto out_err;
234 }
235 to_page = ttm->pages[i];
236 if (unlikely(to_page == NULL)) {
237 ret = -ENOMEM;
238 goto out_err;
239 }
240
241 copy_highpage(to_page, from_page);
242 put_page(from_page);
243 }
244
245 fput(swap_storage);
246 ttm->swap_storage = NULL;
247 ttm->page_flags &= ~TTM_TT_FLAG_SWAPPED;
248
249 return 0;
250
251out_err:
252 return ret;
253}
254EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_swapin);
255
256/**
257 * ttm_tt_swapout - swap out tt object
258 *
259 * @bdev: TTM device structure.
260 * @ttm: The struct ttm_tt.
261 * @gfp_flags: Flags to use for memory allocation.
262 *
263 * Swapout a TT object to a shmem_file, return number of pages swapped out or
264 * negative error code.
265 */
266int ttm_tt_swapout(struct ttm_device *bdev, struct ttm_tt *ttm,
267 gfp_t gfp_flags)
268{
269 loff_t size = (loff_t)ttm->num_pages << PAGE_SHIFT;
270 struct address_space *swap_space;
271 struct file *swap_storage;
272 struct page *from_page;
273 struct page *to_page;
274 int i, ret;
275
276 swap_storage = shmem_file_setup("ttm swap", size, 0);
277 if (IS_ERR(swap_storage)) {
278 pr_err("Failed allocating swap storage\n");
279 return PTR_ERR(swap_storage);
280 }
281
282 swap_space = swap_storage->f_mapping;
283 gfp_flags &= mapping_gfp_mask(swap_space);
284
285 for (i = 0; i < ttm->num_pages; ++i) {
286 from_page = ttm->pages[i];
287 if (unlikely(from_page == NULL))
288 continue;
289
290 to_page = shmem_read_mapping_page_gfp(swap_space, i, gfp_flags);
291 if (IS_ERR(to_page)) {
292 ret = PTR_ERR(to_page);
293 goto out_err;
294 }
295 copy_highpage(to_page, from_page);
296 set_page_dirty(to_page);
297 mark_page_accessed(to_page);
298 put_page(to_page);
299 }
300
301 ttm_tt_unpopulate(bdev, ttm);
302 ttm->swap_storage = swap_storage;
303 ttm->page_flags |= TTM_TT_FLAG_SWAPPED;
304
305 return ttm->num_pages;
306
307out_err:
308 fput(swap_storage);
309
310 return ret;
311}
312EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_swapout);
313
314int ttm_tt_populate(struct ttm_device *bdev,
315 struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
316{
317 int ret;
318
319 if (!ttm)
320 return -EINVAL;
321
322 if (ttm_tt_is_populated(ttm))
323 return 0;
324
325 if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
326 atomic_long_add(ttm->num_pages, &ttm_pages_allocated);
327 if (bdev->pool.use_dma32)
328 atomic_long_add(ttm->num_pages,
329 &ttm_dma32_pages_allocated);
330 }
331
332 while (atomic_long_read(&ttm_pages_allocated) > ttm_pages_limit ||
333 atomic_long_read(&ttm_dma32_pages_allocated) >
334 ttm_dma32_pages_limit) {
335
336 ret = ttm_global_swapout(ctx, GFP_KERNEL);
337 if (ret == 0)
338 break;
339 if (ret < 0)
340 goto error;
341 }
342
343 if (bdev->funcs->ttm_tt_populate)
344 ret = bdev->funcs->ttm_tt_populate(bdev, ttm, ctx);
345 else
346 ret = ttm_pool_alloc(&bdev->pool, ttm, ctx);
347 if (ret)
348 goto error;
349
350 ttm->page_flags |= TTM_TT_FLAG_PRIV_POPULATED;
351 if (unlikely(ttm->page_flags & TTM_TT_FLAG_SWAPPED)) {
352 ret = ttm_tt_swapin(ttm);
353 if (unlikely(ret != 0)) {
354 ttm_tt_unpopulate(bdev, ttm);
355 return ret;
356 }
357 }
358
359 return 0;
360
361error:
362 if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
363 atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
364 if (bdev->pool.use_dma32)
365 atomic_long_sub(ttm->num_pages,
366 &ttm_dma32_pages_allocated);
367 }
368 return ret;
369}
370
371#if IS_ENABLED(CONFIG_DRM_TTM_KUNIT_TEST)
372EXPORT_SYMBOL(ttm_tt_populate);
373#endif
374
375void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
376{
377 if (!ttm_tt_is_populated(ttm))
378 return;
379
380 if (bdev->funcs->ttm_tt_unpopulate)
381 bdev->funcs->ttm_tt_unpopulate(bdev, ttm);
382 else
383 ttm_pool_free(&bdev->pool, ttm);
384
385 if (!(ttm->page_flags & TTM_TT_FLAG_EXTERNAL)) {
386 atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
387 if (bdev->pool.use_dma32)
388 atomic_long_sub(ttm->num_pages,
389 &ttm_dma32_pages_allocated);
390 }
391
392 ttm->page_flags &= ~TTM_TT_FLAG_PRIV_POPULATED;
393}
394EXPORT_SYMBOL_FOR_TESTS_ONLY(ttm_tt_unpopulate);
395
396#ifdef CONFIG_DEBUG_FS
397
398/* Test the shrinker functions and dump the result */
399static int ttm_tt_debugfs_shrink_show(struct seq_file *m, void *data)
400{
401 struct ttm_operation_ctx ctx = { false, false };
402
403 seq_printf(m, "%d\n", ttm_global_swapout(&ctx, GFP_KERNEL));
404 return 0;
405}
406DEFINE_SHOW_ATTRIBUTE(ttm_tt_debugfs_shrink);
407
408#endif
409
410
411/*
412 * ttm_tt_mgr_init - register with the MM shrinker
413 *
414 * Register with the MM shrinker for swapping out BOs.
415 */
416void ttm_tt_mgr_init(unsigned long num_pages, unsigned long num_dma32_pages)
417{
418#ifdef CONFIG_DEBUG_FS
419 debugfs_create_file("tt_shrink", 0400, ttm_debugfs_root, NULL,
420 &ttm_tt_debugfs_shrink_fops);
421#endif
422
423 if (!ttm_pages_limit)
424 ttm_pages_limit = num_pages;
425
426 if (!ttm_dma32_pages_limit)
427 ttm_dma32_pages_limit = num_dma32_pages;
428}
429
430static void ttm_kmap_iter_tt_map_local(struct ttm_kmap_iter *iter,
431 struct iosys_map *dmap,
432 pgoff_t i)
433{
434 struct ttm_kmap_iter_tt *iter_tt =
435 container_of(iter, typeof(*iter_tt), base);
436
437 iosys_map_set_vaddr(dmap, kmap_local_page_prot(iter_tt->tt->pages[i],
438 iter_tt->prot));
439}
440
441static void ttm_kmap_iter_tt_unmap_local(struct ttm_kmap_iter *iter,
442 struct iosys_map *map)
443{
444 kunmap_local(map->vaddr);
445}
446
447static const struct ttm_kmap_iter_ops ttm_kmap_iter_tt_ops = {
448 .map_local = ttm_kmap_iter_tt_map_local,
449 .unmap_local = ttm_kmap_iter_tt_unmap_local,
450 .maps_tt = true,
451};
452
453/**
454 * ttm_kmap_iter_tt_init - Initialize a struct ttm_kmap_iter_tt
455 * @iter_tt: The struct ttm_kmap_iter_tt to initialize.
456 * @tt: Struct ttm_tt holding page pointers of the struct ttm_resource.
457 *
458 * Return: Pointer to the embedded struct ttm_kmap_iter.
459 */
460struct ttm_kmap_iter *
461ttm_kmap_iter_tt_init(struct ttm_kmap_iter_tt *iter_tt,
462 struct ttm_tt *tt)
463{
464 iter_tt->base.ops = &ttm_kmap_iter_tt_ops;
465 iter_tt->tt = tt;
466 if (tt)
467 iter_tt->prot = ttm_prot_from_caching(tt->caching, PAGE_KERNEL);
468 else
469 iter_tt->prot = PAGE_KERNEL;
470
471 return &iter_tt->base;
472}
473EXPORT_SYMBOL(ttm_kmap_iter_tt_init);
474
475unsigned long ttm_tt_pages_limit(void)
476{
477 return ttm_pages_limit;
478}
479EXPORT_SYMBOL(ttm_tt_pages_limit);