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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> | |
72525b3f | 36 | #include <drm/drm_vma_manager.h> |
ba4e7d97 | 37 | #include <linux/mm.h> |
ba4e7d97 TH |
38 | #include <linux/rbtree.h> |
39 | #include <linux/module.h> | |
40 | #include <linux/uaccess.h> | |
41 | ||
42 | #define TTM_BO_VM_NUM_PREFAULT 16 | |
43 | ||
cbe12e74 TH |
44 | static int ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo, |
45 | struct vm_area_struct *vma, | |
46 | struct vm_fault *vmf) | |
47 | { | |
48 | struct ttm_bo_device *bdev = bo->bdev; | |
49 | int ret = 0; | |
50 | ||
51 | spin_lock(&bdev->fence_lock); | |
52 | if (likely(!test_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags))) | |
53 | goto out_unlock; | |
54 | ||
55 | /* | |
56 | * Quick non-stalling check for idle. | |
57 | */ | |
58 | ret = ttm_bo_wait(bo, false, false, true); | |
59 | if (likely(ret == 0)) | |
60 | goto out_unlock; | |
61 | ||
62 | /* | |
63 | * If possible, avoid waiting for GPU with mmap_sem | |
64 | * held. | |
65 | */ | |
66 | if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) { | |
67 | ret = VM_FAULT_RETRY; | |
68 | if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT) | |
69 | goto out_unlock; | |
70 | ||
71 | up_read(&vma->vm_mm->mmap_sem); | |
72 | (void) ttm_bo_wait(bo, false, true, false); | |
73 | goto out_unlock; | |
74 | } | |
75 | ||
76 | /* | |
77 | * Ordinary wait. | |
78 | */ | |
79 | ret = ttm_bo_wait(bo, false, true, false); | |
80 | if (unlikely(ret != 0)) | |
81 | ret = (ret != -ERESTARTSYS) ? VM_FAULT_SIGBUS : | |
82 | VM_FAULT_NOPAGE; | |
83 | ||
84 | out_unlock: | |
85 | spin_unlock(&bdev->fence_lock); | |
86 | return ret; | |
87 | } | |
88 | ||
ba4e7d97 TH |
89 | static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
90 | { | |
91 | struct ttm_buffer_object *bo = (struct ttm_buffer_object *) | |
92 | vma->vm_private_data; | |
93 | struct ttm_bo_device *bdev = bo->bdev; | |
ba4e7d97 TH |
94 | unsigned long page_offset; |
95 | unsigned long page_last; | |
96 | unsigned long pfn; | |
97 | struct ttm_tt *ttm = NULL; | |
98 | struct page *page; | |
99 | int ret; | |
100 | int i; | |
ba4e7d97 TH |
101 | unsigned long address = (unsigned long)vmf->virtual_address; |
102 | int retval = VM_FAULT_NOPAGE; | |
eba67093 TH |
103 | struct ttm_mem_type_manager *man = |
104 | &bdev->man[bo->mem.mem_type]; | |
3943875e | 105 | struct vm_area_struct cvma; |
ba4e7d97 TH |
106 | |
107 | /* | |
108 | * Work around locking order reversal in fault / nopfn | |
109 | * between mmap_sem and bo_reserve: Perform a trylock operation | |
c58f009e TH |
110 | * for reserve, and if it fails, retry the fault after waiting |
111 | * for the buffer to become unreserved. | |
ba4e7d97 | 112 | */ |
c58f009e | 113 | ret = ttm_bo_reserve(bo, true, true, false, NULL); |
ba4e7d97 | 114 | if (unlikely(ret != 0)) { |
c58f009e TH |
115 | if (ret != -EBUSY) |
116 | return VM_FAULT_NOPAGE; | |
117 | ||
118 | if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) { | |
119 | if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) { | |
120 | up_read(&vma->vm_mm->mmap_sem); | |
121 | (void) ttm_bo_wait_unreserved(bo); | |
122 | } | |
123 | ||
124 | return VM_FAULT_RETRY; | |
125 | } | |
126 | ||
127 | /* | |
128 | * If we'd want to change locking order to | |
129 | * mmap_sem -> bo::reserve, we'd use a blocking reserve here | |
130 | * instead of retrying the fault... | |
131 | */ | |
ba4e7d97 TH |
132 | return VM_FAULT_NOPAGE; |
133 | } | |
134 | ||
667a50db TH |
135 | /* |
136 | * Refuse to fault imported pages. This should be handled | |
137 | * (if at all) by redirecting mmap to the exporter. | |
138 | */ | |
139 | if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) { | |
140 | retval = VM_FAULT_SIGBUS; | |
141 | goto out_unlock; | |
142 | } | |
143 | ||
82c5da6b JG |
144 | if (bdev->driver->fault_reserve_notify) { |
145 | ret = bdev->driver->fault_reserve_notify(bo); | |
146 | switch (ret) { | |
147 | case 0: | |
148 | break; | |
149 | case -EBUSY: | |
82c5da6b JG |
150 | case -ERESTARTSYS: |
151 | retval = VM_FAULT_NOPAGE; | |
152 | goto out_unlock; | |
153 | default: | |
154 | retval = VM_FAULT_SIGBUS; | |
155 | goto out_unlock; | |
156 | } | |
157 | } | |
e024e110 | 158 | |
ba4e7d97 TH |
159 | /* |
160 | * Wait for buffer data in transit, due to a pipelined | |
161 | * move. | |
162 | */ | |
cbe12e74 TH |
163 | ret = ttm_bo_vm_fault_idle(bo, vma, vmf); |
164 | if (unlikely(ret != 0)) { | |
165 | retval = ret; | |
166 | goto out_unlock; | |
167 | } | |
ba4e7d97 | 168 | |
eba67093 TH |
169 | ret = ttm_mem_io_lock(man, true); |
170 | if (unlikely(ret != 0)) { | |
171 | retval = VM_FAULT_NOPAGE; | |
ba4e7d97 TH |
172 | goto out_unlock; |
173 | } | |
eba67093 TH |
174 | ret = ttm_mem_io_reserve_vm(bo); |
175 | if (unlikely(ret != 0)) { | |
176 | retval = VM_FAULT_SIGBUS; | |
177 | goto out_io_unlock; | |
178 | } | |
ba4e7d97 | 179 | |
ba4e7d97 | 180 | page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) + |
d3867355 TH |
181 | vma->vm_pgoff - drm_vma_node_start(&bo->vma_node); |
182 | page_last = vma_pages(vma) + vma->vm_pgoff - | |
183 | drm_vma_node_start(&bo->vma_node); | |
ba4e7d97 TH |
184 | |
185 | if (unlikely(page_offset >= bo->num_pages)) { | |
186 | retval = VM_FAULT_SIGBUS; | |
eba67093 | 187 | goto out_io_unlock; |
ba4e7d97 TH |
188 | } |
189 | ||
190 | /* | |
3943875e TH |
191 | * Make a local vma copy to modify the page_prot member |
192 | * and vm_flags if necessary. The vma parameter is protected | |
193 | * by mmap_sem in write mode. | |
ba4e7d97 | 194 | */ |
3943875e TH |
195 | cvma = *vma; |
196 | cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags); | |
197 | ||
82c5da6b | 198 | if (bo->mem.bus.is_iomem) { |
3943875e TH |
199 | cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, |
200 | cvma.vm_page_prot); | |
ba4e7d97 TH |
201 | } else { |
202 | ttm = bo->ttm; | |
3943875e TH |
203 | if (!(bo->mem.placement & TTM_PL_FLAG_CACHED)) |
204 | cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, | |
205 | cvma.vm_page_prot); | |
b1e5f172 JG |
206 | |
207 | /* Allocate all page at once, most common usage */ | |
208 | if (ttm->bdev->driver->ttm_tt_populate(ttm)) { | |
209 | retval = VM_FAULT_OOM; | |
210 | goto out_io_unlock; | |
211 | } | |
ba4e7d97 TH |
212 | } |
213 | ||
214 | /* | |
215 | * Speculatively prefault a number of pages. Only error on | |
216 | * first page. | |
217 | */ | |
ba4e7d97 | 218 | for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) { |
82c5da6b JG |
219 | if (bo->mem.bus.is_iomem) |
220 | pfn = ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) + page_offset; | |
ba4e7d97 | 221 | else { |
b1e5f172 | 222 | page = ttm->pages[page_offset]; |
ba4e7d97 TH |
223 | if (unlikely(!page && i == 0)) { |
224 | retval = VM_FAULT_OOM; | |
eba67093 | 225 | goto out_io_unlock; |
ba4e7d97 TH |
226 | } else if (unlikely(!page)) { |
227 | break; | |
228 | } | |
58aa6622 TH |
229 | page->mapping = vma->vm_file->f_mapping; |
230 | page->index = drm_vma_node_start(&bo->vma_node) + | |
231 | page_offset; | |
ba4e7d97 TH |
232 | pfn = page_to_pfn(page); |
233 | } | |
234 | ||
7dfe8b61 TH |
235 | if (vma->vm_flags & VM_MIXEDMAP) |
236 | ret = vm_insert_mixed(&cvma, address, pfn); | |
237 | else | |
238 | ret = vm_insert_pfn(&cvma, address, pfn); | |
239 | ||
ba4e7d97 TH |
240 | /* |
241 | * Somebody beat us to this PTE or prefaulting to | |
242 | * an already populated PTE, or prefaulting error. | |
243 | */ | |
244 | ||
245 | if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0))) | |
246 | break; | |
247 | else if (unlikely(ret != 0)) { | |
248 | retval = | |
249 | (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; | |
eba67093 | 250 | goto out_io_unlock; |
ba4e7d97 TH |
251 | } |
252 | ||
253 | address += PAGE_SIZE; | |
254 | if (unlikely(++page_offset >= page_last)) | |
255 | break; | |
256 | } | |
eba67093 TH |
257 | out_io_unlock: |
258 | ttm_mem_io_unlock(man); | |
ba4e7d97 TH |
259 | out_unlock: |
260 | ttm_bo_unreserve(bo); | |
261 | return retval; | |
262 | } | |
263 | ||
264 | static void ttm_bo_vm_open(struct vm_area_struct *vma) | |
265 | { | |
266 | struct ttm_buffer_object *bo = | |
267 | (struct ttm_buffer_object *)vma->vm_private_data; | |
268 | ||
58aa6622 TH |
269 | WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping); |
270 | ||
ba4e7d97 TH |
271 | (void)ttm_bo_reference(bo); |
272 | } | |
273 | ||
274 | static void ttm_bo_vm_close(struct vm_area_struct *vma) | |
275 | { | |
82c5da6b | 276 | struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data; |
ba4e7d97 TH |
277 | |
278 | ttm_bo_unref(&bo); | |
279 | vma->vm_private_data = NULL; | |
280 | } | |
281 | ||
f0f37e2f | 282 | static const struct vm_operations_struct ttm_bo_vm_ops = { |
ba4e7d97 TH |
283 | .fault = ttm_bo_vm_fault, |
284 | .open = ttm_bo_vm_open, | |
285 | .close = ttm_bo_vm_close | |
286 | }; | |
287 | ||
72525b3f DH |
288 | static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev, |
289 | unsigned long offset, | |
290 | unsigned long pages) | |
291 | { | |
292 | struct drm_vma_offset_node *node; | |
293 | struct ttm_buffer_object *bo = NULL; | |
294 | ||
295 | drm_vma_offset_lock_lookup(&bdev->vma_manager); | |
296 | ||
297 | node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages); | |
298 | if (likely(node)) { | |
299 | bo = container_of(node, struct ttm_buffer_object, vma_node); | |
300 | if (!kref_get_unless_zero(&bo->kref)) | |
301 | bo = NULL; | |
302 | } | |
303 | ||
304 | drm_vma_offset_unlock_lookup(&bdev->vma_manager); | |
305 | ||
306 | if (!bo) | |
307 | pr_err("Could not find buffer object to map\n"); | |
308 | ||
309 | return bo; | |
310 | } | |
311 | ||
ba4e7d97 TH |
312 | int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma, |
313 | struct ttm_bo_device *bdev) | |
314 | { | |
315 | struct ttm_bo_driver *driver; | |
316 | struct ttm_buffer_object *bo; | |
317 | int ret; | |
318 | ||
72525b3f DH |
319 | bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma)); |
320 | if (unlikely(!bo)) | |
ba4e7d97 | 321 | return -EINVAL; |
ba4e7d97 TH |
322 | |
323 | driver = bo->bdev->driver; | |
324 | if (unlikely(!driver->verify_access)) { | |
325 | ret = -EPERM; | |
326 | goto out_unref; | |
327 | } | |
328 | ret = driver->verify_access(bo, filp); | |
329 | if (unlikely(ret != 0)) | |
330 | goto out_unref; | |
331 | ||
332 | vma->vm_ops = &ttm_bo_vm_ops; | |
333 | ||
334 | /* | |
335 | * Note: We're transferring the bo reference to | |
336 | * vma->vm_private_data here. | |
337 | */ | |
338 | ||
339 | vma->vm_private_data = bo; | |
7dfe8b61 TH |
340 | |
341 | /* | |
342 | * PFNMAP is faster than MIXEDMAP due to reduced page | |
343 | * administration. So use MIXEDMAP only if private VMA, where | |
344 | * we need to support COW. | |
345 | */ | |
346 | vma->vm_flags |= (vma->vm_flags & VM_SHARED) ? VM_PFNMAP : VM_MIXEDMAP; | |
347 | vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; | |
ba4e7d97 TH |
348 | return 0; |
349 | out_unref: | |
350 | ttm_bo_unref(&bo); | |
351 | return ret; | |
352 | } | |
353 | EXPORT_SYMBOL(ttm_bo_mmap); | |
354 | ||
355 | int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo) | |
356 | { | |
357 | if (vma->vm_pgoff != 0) | |
358 | return -EACCES; | |
359 | ||
360 | vma->vm_ops = &ttm_bo_vm_ops; | |
361 | vma->vm_private_data = ttm_bo_reference(bo); | |
7dfe8b61 TH |
362 | vma->vm_flags |= (vma->vm_flags & VM_SHARED) ? VM_PFNMAP : VM_MIXEDMAP; |
363 | vma->vm_flags |= VM_IO | VM_DONTEXPAND; | |
ba4e7d97 TH |
364 | return 0; |
365 | } | |
366 | EXPORT_SYMBOL(ttm_fbdev_mmap); |