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ba4e7d97 TH |
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 | ||
25d0479a JP |
31 | #define pr_fmt(fmt) "[TTM] " fmt |
32 | ||
ba4e7d97 TH |
33 | #include <ttm/ttm_module.h> |
34 | #include <ttm/ttm_bo_driver.h> | |
35 | #include <ttm/ttm_placement.h> | |
36 | #include <linux/mm.h> | |
ba4e7d97 TH |
37 | #include <linux/rbtree.h> |
38 | #include <linux/module.h> | |
39 | #include <linux/uaccess.h> | |
40 | ||
41 | #define TTM_BO_VM_NUM_PREFAULT 16 | |
42 | ||
43 | static struct ttm_buffer_object *ttm_bo_vm_lookup_rb(struct ttm_bo_device *bdev, | |
44 | unsigned long page_start, | |
45 | unsigned long num_pages) | |
46 | { | |
47 | struct rb_node *cur = bdev->addr_space_rb.rb_node; | |
48 | unsigned long cur_offset; | |
49 | struct ttm_buffer_object *bo; | |
50 | struct ttm_buffer_object *best_bo = NULL; | |
51 | ||
52 | while (likely(cur != NULL)) { | |
53 | bo = rb_entry(cur, struct ttm_buffer_object, vm_rb); | |
54 | cur_offset = bo->vm_node->start; | |
55 | if (page_start >= cur_offset) { | |
56 | cur = cur->rb_right; | |
57 | best_bo = bo; | |
58 | if (page_start == cur_offset) | |
59 | break; | |
60 | } else | |
61 | cur = cur->rb_left; | |
62 | } | |
63 | ||
64 | if (unlikely(best_bo == NULL)) | |
65 | return NULL; | |
66 | ||
67 | if (unlikely((best_bo->vm_node->start + best_bo->num_pages) < | |
68 | (page_start + num_pages))) | |
69 | return NULL; | |
70 | ||
71 | return best_bo; | |
72 | } | |
73 | ||
74 | static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
75 | { | |
76 | struct ttm_buffer_object *bo = (struct ttm_buffer_object *) | |
77 | vma->vm_private_data; | |
78 | struct ttm_bo_device *bdev = bo->bdev; | |
ba4e7d97 TH |
79 | unsigned long page_offset; |
80 | unsigned long page_last; | |
81 | unsigned long pfn; | |
82 | struct ttm_tt *ttm = NULL; | |
83 | struct page *page; | |
84 | int ret; | |
85 | int i; | |
ba4e7d97 TH |
86 | unsigned long address = (unsigned long)vmf->virtual_address; |
87 | int retval = VM_FAULT_NOPAGE; | |
eba67093 TH |
88 | struct ttm_mem_type_manager *man = |
89 | &bdev->man[bo->mem.mem_type]; | |
ba4e7d97 TH |
90 | |
91 | /* | |
92 | * Work around locking order reversal in fault / nopfn | |
93 | * between mmap_sem and bo_reserve: Perform a trylock operation | |
94 | * for reserve, and if it fails, retry the fault after scheduling. | |
95 | */ | |
96 | ||
97 | ret = ttm_bo_reserve(bo, true, true, false, 0); | |
98 | if (unlikely(ret != 0)) { | |
99 | if (ret == -EBUSY) | |
100 | set_need_resched(); | |
101 | return VM_FAULT_NOPAGE; | |
102 | } | |
103 | ||
82c5da6b JG |
104 | if (bdev->driver->fault_reserve_notify) { |
105 | ret = bdev->driver->fault_reserve_notify(bo); | |
106 | switch (ret) { | |
107 | case 0: | |
108 | break; | |
109 | case -EBUSY: | |
110 | set_need_resched(); | |
111 | case -ERESTARTSYS: | |
112 | retval = VM_FAULT_NOPAGE; | |
113 | goto out_unlock; | |
114 | default: | |
115 | retval = VM_FAULT_SIGBUS; | |
116 | goto out_unlock; | |
117 | } | |
118 | } | |
e024e110 | 119 | |
ba4e7d97 TH |
120 | /* |
121 | * Wait for buffer data in transit, due to a pipelined | |
122 | * move. | |
123 | */ | |
124 | ||
702adba2 | 125 | spin_lock(&bdev->fence_lock); |
ba4e7d97 TH |
126 | if (test_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags)) { |
127 | ret = ttm_bo_wait(bo, false, true, false); | |
702adba2 | 128 | spin_unlock(&bdev->fence_lock); |
ba4e7d97 | 129 | if (unlikely(ret != 0)) { |
98ffc415 | 130 | retval = (ret != -ERESTARTSYS) ? |
ba4e7d97 TH |
131 | VM_FAULT_SIGBUS : VM_FAULT_NOPAGE; |
132 | goto out_unlock; | |
133 | } | |
134 | } else | |
702adba2 | 135 | spin_unlock(&bdev->fence_lock); |
ba4e7d97 | 136 | |
eba67093 TH |
137 | ret = ttm_mem_io_lock(man, true); |
138 | if (unlikely(ret != 0)) { | |
139 | retval = VM_FAULT_NOPAGE; | |
ba4e7d97 TH |
140 | goto out_unlock; |
141 | } | |
eba67093 TH |
142 | ret = ttm_mem_io_reserve_vm(bo); |
143 | if (unlikely(ret != 0)) { | |
144 | retval = VM_FAULT_SIGBUS; | |
145 | goto out_io_unlock; | |
146 | } | |
ba4e7d97 | 147 | |
ba4e7d97 TH |
148 | page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) + |
149 | bo->vm_node->start - vma->vm_pgoff; | |
025df775 | 150 | page_last = vma_pages(vma) + |
ba4e7d97 TH |
151 | bo->vm_node->start - vma->vm_pgoff; |
152 | ||
153 | if (unlikely(page_offset >= bo->num_pages)) { | |
154 | retval = VM_FAULT_SIGBUS; | |
eba67093 | 155 | goto out_io_unlock; |
ba4e7d97 TH |
156 | } |
157 | ||
158 | /* | |
159 | * Strictly, we're not allowed to modify vma->vm_page_prot here, | |
160 | * since the mmap_sem is only held in read mode. However, we | |
161 | * modify only the caching bits of vma->vm_page_prot and | |
162 | * consider those bits protected by | |
163 | * the bo->mutex, as we should be the only writers. | |
164 | * There shouldn't really be any readers of these bits except | |
165 | * within vm_insert_mixed()? fork? | |
166 | * | |
167 | * TODO: Add a list of vmas to the bo, and change the | |
168 | * vma->vm_page_prot when the object changes caching policy, with | |
169 | * the correct locks held. | |
170 | */ | |
82c5da6b | 171 | if (bo->mem.bus.is_iomem) { |
ba4e7d97 TH |
172 | vma->vm_page_prot = ttm_io_prot(bo->mem.placement, |
173 | vma->vm_page_prot); | |
174 | } else { | |
175 | ttm = bo->ttm; | |
176 | vma->vm_page_prot = (bo->mem.placement & TTM_PL_FLAG_CACHED) ? | |
177 | vm_get_page_prot(vma->vm_flags) : | |
178 | ttm_io_prot(bo->mem.placement, vma->vm_page_prot); | |
b1e5f172 JG |
179 | |
180 | /* Allocate all page at once, most common usage */ | |
181 | if (ttm->bdev->driver->ttm_tt_populate(ttm)) { | |
182 | retval = VM_FAULT_OOM; | |
183 | goto out_io_unlock; | |
184 | } | |
ba4e7d97 TH |
185 | } |
186 | ||
187 | /* | |
188 | * Speculatively prefault a number of pages. Only error on | |
189 | * first page. | |
190 | */ | |
ba4e7d97 | 191 | for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) { |
82c5da6b JG |
192 | if (bo->mem.bus.is_iomem) |
193 | pfn = ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) + page_offset; | |
ba4e7d97 | 194 | else { |
b1e5f172 | 195 | page = ttm->pages[page_offset]; |
ba4e7d97 TH |
196 | if (unlikely(!page && i == 0)) { |
197 | retval = VM_FAULT_OOM; | |
eba67093 | 198 | goto out_io_unlock; |
ba4e7d97 TH |
199 | } else if (unlikely(!page)) { |
200 | break; | |
201 | } | |
202 | pfn = page_to_pfn(page); | |
203 | } | |
204 | ||
205 | ret = vm_insert_mixed(vma, address, pfn); | |
206 | /* | |
207 | * Somebody beat us to this PTE or prefaulting to | |
208 | * an already populated PTE, or prefaulting error. | |
209 | */ | |
210 | ||
211 | if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0))) | |
212 | break; | |
213 | else if (unlikely(ret != 0)) { | |
214 | retval = | |
215 | (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; | |
eba67093 | 216 | goto out_io_unlock; |
ba4e7d97 TH |
217 | } |
218 | ||
219 | address += PAGE_SIZE; | |
220 | if (unlikely(++page_offset >= page_last)) | |
221 | break; | |
222 | } | |
eba67093 TH |
223 | out_io_unlock: |
224 | ttm_mem_io_unlock(man); | |
ba4e7d97 TH |
225 | out_unlock: |
226 | ttm_bo_unreserve(bo); | |
227 | return retval; | |
228 | } | |
229 | ||
230 | static void ttm_bo_vm_open(struct vm_area_struct *vma) | |
231 | { | |
232 | struct ttm_buffer_object *bo = | |
233 | (struct ttm_buffer_object *)vma->vm_private_data; | |
234 | ||
235 | (void)ttm_bo_reference(bo); | |
236 | } | |
237 | ||
238 | static void ttm_bo_vm_close(struct vm_area_struct *vma) | |
239 | { | |
82c5da6b | 240 | struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data; |
ba4e7d97 TH |
241 | |
242 | ttm_bo_unref(&bo); | |
243 | vma->vm_private_data = NULL; | |
244 | } | |
245 | ||
f0f37e2f | 246 | static const struct vm_operations_struct ttm_bo_vm_ops = { |
ba4e7d97 TH |
247 | .fault = ttm_bo_vm_fault, |
248 | .open = ttm_bo_vm_open, | |
249 | .close = ttm_bo_vm_close | |
250 | }; | |
251 | ||
252 | int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma, | |
253 | struct ttm_bo_device *bdev) | |
254 | { | |
255 | struct ttm_bo_driver *driver; | |
256 | struct ttm_buffer_object *bo; | |
257 | int ret; | |
258 | ||
259 | read_lock(&bdev->vm_lock); | |
260 | bo = ttm_bo_vm_lookup_rb(bdev, vma->vm_pgoff, | |
025df775 | 261 | vma_pages(vma)); |
82fe50bc TH |
262 | if (likely(bo != NULL) && !kref_get_unless_zero(&bo->kref)) |
263 | bo = NULL; | |
ba4e7d97 TH |
264 | read_unlock(&bdev->vm_lock); |
265 | ||
266 | if (unlikely(bo == NULL)) { | |
25d0479a | 267 | pr_err("Could not find buffer object to map\n"); |
ba4e7d97 TH |
268 | return -EINVAL; |
269 | } | |
270 | ||
271 | driver = bo->bdev->driver; | |
272 | if (unlikely(!driver->verify_access)) { | |
273 | ret = -EPERM; | |
274 | goto out_unref; | |
275 | } | |
276 | ret = driver->verify_access(bo, filp); | |
277 | if (unlikely(ret != 0)) | |
278 | goto out_unref; | |
279 | ||
280 | vma->vm_ops = &ttm_bo_vm_ops; | |
281 | ||
282 | /* | |
283 | * Note: We're transferring the bo reference to | |
284 | * vma->vm_private_data here. | |
285 | */ | |
286 | ||
287 | vma->vm_private_data = bo; | |
314e51b9 | 288 | vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP; |
ba4e7d97 TH |
289 | return 0; |
290 | out_unref: | |
291 | ttm_bo_unref(&bo); | |
292 | return ret; | |
293 | } | |
294 | EXPORT_SYMBOL(ttm_bo_mmap); | |
295 | ||
296 | int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo) | |
297 | { | |
298 | if (vma->vm_pgoff != 0) | |
299 | return -EACCES; | |
300 | ||
301 | vma->vm_ops = &ttm_bo_vm_ops; | |
302 | vma->vm_private_data = ttm_bo_reference(bo); | |
314e51b9 | 303 | vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND; |
ba4e7d97 TH |
304 | return 0; |
305 | } | |
306 | EXPORT_SYMBOL(ttm_fbdev_mmap); | |
307 | ||
308 | ||
309 | ssize_t ttm_bo_io(struct ttm_bo_device *bdev, struct file *filp, | |
310 | const char __user *wbuf, char __user *rbuf, size_t count, | |
311 | loff_t *f_pos, bool write) | |
312 | { | |
313 | struct ttm_buffer_object *bo; | |
314 | struct ttm_bo_driver *driver; | |
315 | struct ttm_bo_kmap_obj map; | |
316 | unsigned long dev_offset = (*f_pos >> PAGE_SHIFT); | |
317 | unsigned long kmap_offset; | |
318 | unsigned long kmap_end; | |
319 | unsigned long kmap_num; | |
320 | size_t io_size; | |
321 | unsigned int page_offset; | |
322 | char *virtual; | |
323 | int ret; | |
324 | bool no_wait = false; | |
325 | bool dummy; | |
326 | ||
327 | read_lock(&bdev->vm_lock); | |
328 | bo = ttm_bo_vm_lookup_rb(bdev, dev_offset, 1); | |
329 | if (likely(bo != NULL)) | |
330 | ttm_bo_reference(bo); | |
331 | read_unlock(&bdev->vm_lock); | |
332 | ||
333 | if (unlikely(bo == NULL)) | |
334 | return -EFAULT; | |
335 | ||
336 | driver = bo->bdev->driver; | |
b8ff7357 | 337 | if (unlikely(!driver->verify_access)) { |
ba4e7d97 TH |
338 | ret = -EPERM; |
339 | goto out_unref; | |
340 | } | |
341 | ||
342 | ret = driver->verify_access(bo, filp); | |
343 | if (unlikely(ret != 0)) | |
344 | goto out_unref; | |
345 | ||
346 | kmap_offset = dev_offset - bo->vm_node->start; | |
916635bf | 347 | if (unlikely(kmap_offset >= bo->num_pages)) { |
ba4e7d97 TH |
348 | ret = -EFBIG; |
349 | goto out_unref; | |
350 | } | |
351 | ||
352 | page_offset = *f_pos & ~PAGE_MASK; | |
353 | io_size = bo->num_pages - kmap_offset; | |
354 | io_size = (io_size << PAGE_SHIFT) - page_offset; | |
355 | if (count < io_size) | |
356 | io_size = count; | |
357 | ||
358 | kmap_end = (*f_pos + count - 1) >> PAGE_SHIFT; | |
359 | kmap_num = kmap_end - kmap_offset + 1; | |
360 | ||
361 | ret = ttm_bo_reserve(bo, true, no_wait, false, 0); | |
362 | ||
363 | switch (ret) { | |
364 | case 0: | |
365 | break; | |
ba4e7d97 TH |
366 | case -EBUSY: |
367 | ret = -EAGAIN; | |
368 | goto out_unref; | |
369 | default: | |
370 | goto out_unref; | |
371 | } | |
372 | ||
373 | ret = ttm_bo_kmap(bo, kmap_offset, kmap_num, &map); | |
374 | if (unlikely(ret != 0)) { | |
375 | ttm_bo_unreserve(bo); | |
376 | goto out_unref; | |
377 | } | |
378 | ||
379 | virtual = ttm_kmap_obj_virtual(&map, &dummy); | |
380 | virtual += page_offset; | |
381 | ||
382 | if (write) | |
383 | ret = copy_from_user(virtual, wbuf, io_size); | |
384 | else | |
385 | ret = copy_to_user(rbuf, virtual, io_size); | |
386 | ||
387 | ttm_bo_kunmap(&map); | |
388 | ttm_bo_unreserve(bo); | |
389 | ttm_bo_unref(&bo); | |
390 | ||
391 | if (unlikely(ret != 0)) | |
392 | return -EFBIG; | |
393 | ||
394 | *f_pos += io_size; | |
395 | ||
396 | return io_size; | |
397 | out_unref: | |
398 | ttm_bo_unref(&bo); | |
399 | return ret; | |
400 | } | |
401 | ||
402 | ssize_t ttm_bo_fbdev_io(struct ttm_buffer_object *bo, const char __user *wbuf, | |
403 | char __user *rbuf, size_t count, loff_t *f_pos, | |
404 | bool write) | |
405 | { | |
406 | struct ttm_bo_kmap_obj map; | |
407 | unsigned long kmap_offset; | |
408 | unsigned long kmap_end; | |
409 | unsigned long kmap_num; | |
410 | size_t io_size; | |
411 | unsigned int page_offset; | |
412 | char *virtual; | |
413 | int ret; | |
414 | bool no_wait = false; | |
415 | bool dummy; | |
416 | ||
417 | kmap_offset = (*f_pos >> PAGE_SHIFT); | |
916635bf | 418 | if (unlikely(kmap_offset >= bo->num_pages)) |
ba4e7d97 TH |
419 | return -EFBIG; |
420 | ||
421 | page_offset = *f_pos & ~PAGE_MASK; | |
422 | io_size = bo->num_pages - kmap_offset; | |
423 | io_size = (io_size << PAGE_SHIFT) - page_offset; | |
424 | if (count < io_size) | |
425 | io_size = count; | |
426 | ||
427 | kmap_end = (*f_pos + count - 1) >> PAGE_SHIFT; | |
428 | kmap_num = kmap_end - kmap_offset + 1; | |
429 | ||
430 | ret = ttm_bo_reserve(bo, true, no_wait, false, 0); | |
431 | ||
432 | switch (ret) { | |
433 | case 0: | |
434 | break; | |
ba4e7d97 TH |
435 | case -EBUSY: |
436 | return -EAGAIN; | |
437 | default: | |
438 | return ret; | |
439 | } | |
440 | ||
441 | ret = ttm_bo_kmap(bo, kmap_offset, kmap_num, &map); | |
442 | if (unlikely(ret != 0)) { | |
443 | ttm_bo_unreserve(bo); | |
444 | return ret; | |
445 | } | |
446 | ||
447 | virtual = ttm_kmap_obj_virtual(&map, &dummy); | |
448 | virtual += page_offset; | |
449 | ||
450 | if (write) | |
451 | ret = copy_from_user(virtual, wbuf, io_size); | |
452 | else | |
453 | ret = copy_to_user(rbuf, virtual, io_size); | |
454 | ||
455 | ttm_bo_kunmap(&map); | |
456 | ttm_bo_unreserve(bo); | |
457 | ttm_bo_unref(&bo); | |
458 | ||
459 | if (unlikely(ret != 0)) | |
460 | return ret; | |
461 | ||
462 | *f_pos += io_size; | |
463 | ||
464 | return io_size; | |
465 | } |