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 * Copyright (c) 2013 The FreeBSD Foundation
32 * All rights reserved.
33 *
34 * Portions of this software were developed by Konstantin Belousov
35 * <kib@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
36 */
37
38 #include <sys/cdefs.h>
39 #include <dev/drm2/drmP.h>
40 #include <dev/drm2/ttm/ttm_module.h>
41 #include <dev/drm2/ttm/ttm_bo_driver.h>
42 #include <dev/drm2/ttm/ttm_placement.h>
43 #include <dev/drm2/ttm/ttm_page_alloc.h>
44
45 MALLOC_DEFINE(M_TTM_PD, "ttm_pd", "TTM Page Directories");
46
47 /**
48 * Allocates storage for pointers to the pages that back the ttm.
49 */
ttm_tt_alloc_page_directory(struct ttm_tt * ttm)50 static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
51 {
52 ttm->pages = malloc(ttm->num_pages * sizeof(void *),
53 M_TTM_PD, M_WAITOK | M_ZERO);
54 }
55
ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt * ttm)56 static void ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
57 {
58 ttm->ttm.pages = malloc(ttm->ttm.num_pages * sizeof(void *),
59 M_TTM_PD, M_WAITOK | M_ZERO);
60 ttm->dma_address = malloc(ttm->ttm.num_pages *
61 sizeof(*ttm->dma_address), M_TTM_PD, M_WAITOK);
62 }
63
64 #if defined(__i386__) || defined(__amd64__)
ttm_tt_set_page_caching(vm_page_t p,enum ttm_caching_state c_old,enum ttm_caching_state c_new)65 static inline int ttm_tt_set_page_caching(vm_page_t p,
66 enum ttm_caching_state c_old,
67 enum ttm_caching_state c_new)
68 {
69
70 /* XXXKIB our VM does not need this. */
71 #if 0
72 if (c_old != tt_cached) {
73 /* p isn't in the default caching state, set it to
74 * writeback first to free its current memtype. */
75 pmap_page_set_memattr(p, VM_MEMATTR_WRITE_BACK);
76 }
77 #endif
78
79 if (c_new == tt_wc)
80 pmap_page_set_memattr(p, VM_MEMATTR_WRITE_COMBINING);
81 else if (c_new == tt_uncached)
82 pmap_page_set_memattr(p, VM_MEMATTR_UNCACHEABLE);
83
84 return (0);
85 }
86 #else
ttm_tt_set_page_caching(vm_page_t p,enum ttm_caching_state c_old,enum ttm_caching_state c_new)87 static inline int ttm_tt_set_page_caching(vm_page_t p,
88 enum ttm_caching_state c_old,
89 enum ttm_caching_state c_new)
90 {
91 return 0;
92 }
93 #endif
94
95 /*
96 * Change caching policy for the linear kernel map
97 * for range of pages in a ttm.
98 */
99
ttm_tt_set_caching(struct ttm_tt * ttm,enum ttm_caching_state c_state)100 static int ttm_tt_set_caching(struct ttm_tt *ttm,
101 enum ttm_caching_state c_state)
102 {
103 int i, j;
104 vm_page_t cur_page;
105 int ret;
106
107 if (ttm->caching_state == c_state)
108 return 0;
109
110 if (ttm->state == tt_unpopulated) {
111 /* Change caching but don't populate */
112 ttm->caching_state = c_state;
113 return 0;
114 }
115
116 if (ttm->caching_state == tt_cached)
117 drm_clflush_pages(ttm->pages, ttm->num_pages);
118
119 for (i = 0; i < ttm->num_pages; ++i) {
120 cur_page = ttm->pages[i];
121 if (likely(cur_page != NULL)) {
122 ret = ttm_tt_set_page_caching(cur_page,
123 ttm->caching_state,
124 c_state);
125 if (unlikely(ret != 0))
126 goto out_err;
127 }
128 }
129
130 ttm->caching_state = c_state;
131
132 return 0;
133
134 out_err:
135 for (j = 0; j < i; ++j) {
136 cur_page = ttm->pages[j];
137 if (cur_page != NULL) {
138 (void)ttm_tt_set_page_caching(cur_page, c_state,
139 ttm->caching_state);
140 }
141 }
142
143 return ret;
144 }
145
ttm_tt_set_placement_caching(struct ttm_tt * ttm,uint32_t placement)146 int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
147 {
148 enum ttm_caching_state state;
149
150 if (placement & TTM_PL_FLAG_WC)
151 state = tt_wc;
152 else if (placement & TTM_PL_FLAG_UNCACHED)
153 state = tt_uncached;
154 else
155 state = tt_cached;
156
157 return ttm_tt_set_caching(ttm, state);
158 }
159
ttm_tt_destroy(struct ttm_tt * ttm)160 void ttm_tt_destroy(struct ttm_tt *ttm)
161 {
162 if (unlikely(ttm == NULL))
163 return;
164
165 if (ttm->state == tt_bound) {
166 ttm_tt_unbind(ttm);
167 }
168
169 if (likely(ttm->pages != NULL)) {
170 ttm->bdev->driver->ttm_tt_unpopulate(ttm);
171 }
172
173 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP) &&
174 ttm->swap_storage)
175 vm_object_deallocate(ttm->swap_storage);
176
177 ttm->swap_storage = NULL;
178 ttm->func->destroy(ttm);
179 }
180
ttm_tt_init(struct ttm_tt * ttm,struct ttm_bo_device * bdev,unsigned long size,uint32_t page_flags,vm_page_t dummy_read_page)181 int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
182 unsigned long size, uint32_t page_flags,
183 vm_page_t dummy_read_page)
184 {
185 ttm->bdev = bdev;
186 ttm->glob = bdev->glob;
187 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
188 ttm->caching_state = tt_cached;
189 ttm->page_flags = page_flags;
190 ttm->dummy_read_page = dummy_read_page;
191 ttm->state = tt_unpopulated;
192 ttm->swap_storage = NULL;
193
194 ttm_tt_alloc_page_directory(ttm);
195 if (!ttm->pages) {
196 ttm_tt_destroy(ttm);
197 printf("Failed allocating page table\n");
198 return -ENOMEM;
199 }
200 return 0;
201 }
202
ttm_tt_fini(struct ttm_tt * ttm)203 void ttm_tt_fini(struct ttm_tt *ttm)
204 {
205 free(ttm->pages, M_TTM_PD);
206 ttm->pages = NULL;
207 }
208
ttm_dma_tt_init(struct ttm_dma_tt * ttm_dma,struct ttm_bo_device * bdev,unsigned long size,uint32_t page_flags,vm_page_t dummy_read_page)209 int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
210 unsigned long size, uint32_t page_flags,
211 vm_page_t dummy_read_page)
212 {
213 struct ttm_tt *ttm = &ttm_dma->ttm;
214
215 ttm->bdev = bdev;
216 ttm->glob = bdev->glob;
217 ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
218 ttm->caching_state = tt_cached;
219 ttm->page_flags = page_flags;
220 ttm->dummy_read_page = dummy_read_page;
221 ttm->state = tt_unpopulated;
222 ttm->swap_storage = NULL;
223
224 INIT_LIST_HEAD(&ttm_dma->pages_list);
225 ttm_dma_tt_alloc_page_directory(ttm_dma);
226 if (!ttm->pages || !ttm_dma->dma_address) {
227 ttm_tt_destroy(ttm);
228 printf("Failed allocating page table\n");
229 return -ENOMEM;
230 }
231 return 0;
232 }
233
ttm_dma_tt_fini(struct ttm_dma_tt * ttm_dma)234 void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
235 {
236 struct ttm_tt *ttm = &ttm_dma->ttm;
237
238 free(ttm->pages, M_TTM_PD);
239 ttm->pages = NULL;
240 free(ttm_dma->dma_address, M_TTM_PD);
241 ttm_dma->dma_address = NULL;
242 }
243
ttm_tt_unbind(struct ttm_tt * ttm)244 void ttm_tt_unbind(struct ttm_tt *ttm)
245 {
246 int ret __diagused;
247
248 if (ttm->state == tt_bound) {
249 ret = ttm->func->unbind(ttm);
250 MPASS(ret == 0);
251 ttm->state = tt_unbound;
252 }
253 }
254
ttm_tt_bind(struct ttm_tt * ttm,struct ttm_mem_reg * bo_mem)255 int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
256 {
257 int ret = 0;
258
259 if (!ttm)
260 return -EINVAL;
261
262 if (ttm->state == tt_bound)
263 return 0;
264
265 ret = ttm->bdev->driver->ttm_tt_populate(ttm);
266 if (ret)
267 return ret;
268
269 ret = ttm->func->bind(ttm, bo_mem);
270 if (unlikely(ret != 0))
271 return ret;
272
273 ttm->state = tt_bound;
274
275 return 0;
276 }
277
ttm_tt_swapin(struct ttm_tt * ttm)278 int ttm_tt_swapin(struct ttm_tt *ttm)
279 {
280 vm_object_t obj;
281 vm_page_t from_page, to_page;
282 int i, ret, rv;
283
284 obj = ttm->swap_storage;
285
286 vm_object_pip_add(obj, 1);
287 for (i = 0; i < ttm->num_pages; ++i) {
288 rv = vm_page_grab_valid_unlocked(&from_page, obj, i,
289 VM_ALLOC_NORMAL | VM_ALLOC_SBUSY | VM_ALLOC_IGN_SBUSY);
290 if (rv != VM_PAGER_OK) {
291 ret = -EIO;
292 goto err_ret;
293 }
294 to_page = ttm->pages[i];
295 if (unlikely(to_page == NULL)) {
296 vm_page_sunbusy(from_page);
297 ret = -ENOMEM;
298 goto err_ret;
299 }
300 pmap_copy_page(from_page, to_page);
301 vm_page_sunbusy(from_page);
302 }
303 vm_object_pip_wakeup(obj);
304
305 if (!(ttm->page_flags & TTM_PAGE_FLAG_PERSISTENT_SWAP))
306 vm_object_deallocate(obj);
307 ttm->swap_storage = NULL;
308 ttm->page_flags &= ~TTM_PAGE_FLAG_SWAPPED;
309 return (0);
310
311 err_ret:
312 vm_object_pip_wakeup(obj);
313 return (ret);
314 }
315
ttm_tt_swapout(struct ttm_tt * ttm,vm_object_t persistent_swap_storage)316 int ttm_tt_swapout(struct ttm_tt *ttm, vm_object_t persistent_swap_storage)
317 {
318 vm_object_t obj;
319 vm_page_t from_page, to_page;
320 int i;
321
322 MPASS(ttm->state == tt_unbound || ttm->state == tt_unpopulated);
323 MPASS(ttm->caching_state == tt_cached);
324
325 if (persistent_swap_storage == NULL) {
326 obj = vm_pager_allocate(OBJT_SWAP, NULL,
327 IDX_TO_OFF(ttm->num_pages), VM_PROT_DEFAULT, 0,
328 curthread->td_ucred);
329 if (obj == NULL) {
330 printf("[TTM] Failed allocating swap storage\n");
331 return (-ENOMEM);
332 }
333 } else
334 obj = persistent_swap_storage;
335
336 VM_OBJECT_WLOCK(obj);
337 vm_object_pip_add(obj, 1);
338 for (i = 0; i < ttm->num_pages; ++i) {
339 from_page = ttm->pages[i];
340 if (unlikely(from_page == NULL))
341 continue;
342 to_page = vm_page_grab(obj, i, VM_ALLOC_NORMAL);
343 pmap_copy_page(from_page, to_page);
344 vm_page_valid(to_page);
345 vm_page_dirty(to_page);
346 vm_page_xunbusy(to_page);
347 }
348 vm_object_pip_wakeup(obj);
349 VM_OBJECT_WUNLOCK(obj);
350
351 ttm->bdev->driver->ttm_tt_unpopulate(ttm);
352 ttm->swap_storage = obj;
353 ttm->page_flags |= TTM_PAGE_FLAG_SWAPPED;
354 if (persistent_swap_storage != NULL)
355 ttm->page_flags |= TTM_PAGE_FLAG_PERSISTENT_SWAP;
356 return (0);
357 }
358