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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> |
01c8f1c4 | 38 | #include <linux/pfn_t.h> |
ba4e7d97 TH |
39 | #include <linux/rbtree.h> |
40 | #include <linux/module.h> | |
41 | #include <linux/uaccess.h> | |
42 | ||
43 | #define TTM_BO_VM_NUM_PREFAULT 16 | |
44 | ||
cbe12e74 TH |
45 | static int ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo, |
46 | struct vm_area_struct *vma, | |
47 | struct vm_fault *vmf) | |
48 | { | |
cbe12e74 TH |
49 | int ret = 0; |
50 | ||
5bc73067 | 51 | if (likely(!bo->moving)) |
cbe12e74 TH |
52 | goto out_unlock; |
53 | ||
54 | /* | |
55 | * Quick non-stalling check for idle. | |
56 | */ | |
5bc73067 CK |
57 | if (fence_is_signaled(bo->moving)) |
58 | goto out_clear; | |
cbe12e74 TH |
59 | |
60 | /* | |
61 | * If possible, avoid waiting for GPU with mmap_sem | |
62 | * held. | |
63 | */ | |
64 | if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) { | |
65 | ret = VM_FAULT_RETRY; | |
66 | if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT) | |
67 | goto out_unlock; | |
68 | ||
69 | up_read(&vma->vm_mm->mmap_sem); | |
5bc73067 | 70 | (void) fence_wait(bo->moving, true); |
cbe12e74 TH |
71 | goto out_unlock; |
72 | } | |
73 | ||
74 | /* | |
75 | * Ordinary wait. | |
76 | */ | |
5bc73067 CK |
77 | ret = fence_wait(bo->moving, true); |
78 | if (unlikely(ret != 0)) { | |
cbe12e74 TH |
79 | ret = (ret != -ERESTARTSYS) ? VM_FAULT_SIGBUS : |
80 | VM_FAULT_NOPAGE; | |
5bc73067 CK |
81 | goto out_unlock; |
82 | } | |
83 | ||
84 | out_clear: | |
85 | fence_put(bo->moving); | |
86 | bo->moving = NULL; | |
cbe12e74 TH |
87 | |
88 | out_unlock: | |
cbe12e74 TH |
89 | return ret; |
90 | } | |
91 | ||
ba4e7d97 TH |
92 | static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
93 | { | |
94 | struct ttm_buffer_object *bo = (struct ttm_buffer_object *) | |
95 | vma->vm_private_data; | |
96 | struct ttm_bo_device *bdev = bo->bdev; | |
ba4e7d97 TH |
97 | unsigned long page_offset; |
98 | unsigned long page_last; | |
99 | unsigned long pfn; | |
100 | struct ttm_tt *ttm = NULL; | |
101 | struct page *page; | |
102 | int ret; | |
103 | int i; | |
ba4e7d97 TH |
104 | unsigned long address = (unsigned long)vmf->virtual_address; |
105 | int retval = VM_FAULT_NOPAGE; | |
eba67093 TH |
106 | struct ttm_mem_type_manager *man = |
107 | &bdev->man[bo->mem.mem_type]; | |
3943875e | 108 | struct vm_area_struct cvma; |
ba4e7d97 TH |
109 | |
110 | /* | |
111 | * Work around locking order reversal in fault / nopfn | |
112 | * between mmap_sem and bo_reserve: Perform a trylock operation | |
c58f009e TH |
113 | * for reserve, and if it fails, retry the fault after waiting |
114 | * for the buffer to become unreserved. | |
ba4e7d97 | 115 | */ |
dfd5e50e | 116 | ret = ttm_bo_reserve(bo, true, true, NULL); |
ba4e7d97 | 117 | if (unlikely(ret != 0)) { |
c58f009e TH |
118 | if (ret != -EBUSY) |
119 | return VM_FAULT_NOPAGE; | |
120 | ||
121 | if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) { | |
122 | if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) { | |
123 | up_read(&vma->vm_mm->mmap_sem); | |
124 | (void) ttm_bo_wait_unreserved(bo); | |
125 | } | |
126 | ||
127 | return VM_FAULT_RETRY; | |
128 | } | |
129 | ||
130 | /* | |
131 | * If we'd want to change locking order to | |
132 | * mmap_sem -> bo::reserve, we'd use a blocking reserve here | |
133 | * instead of retrying the fault... | |
134 | */ | |
ba4e7d97 TH |
135 | return VM_FAULT_NOPAGE; |
136 | } | |
137 | ||
667a50db TH |
138 | /* |
139 | * Refuse to fault imported pages. This should be handled | |
140 | * (if at all) by redirecting mmap to the exporter. | |
141 | */ | |
142 | if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) { | |
143 | retval = VM_FAULT_SIGBUS; | |
144 | goto out_unlock; | |
145 | } | |
146 | ||
82c5da6b JG |
147 | if (bdev->driver->fault_reserve_notify) { |
148 | ret = bdev->driver->fault_reserve_notify(bo); | |
149 | switch (ret) { | |
150 | case 0: | |
151 | break; | |
152 | case -EBUSY: | |
82c5da6b JG |
153 | case -ERESTARTSYS: |
154 | retval = VM_FAULT_NOPAGE; | |
155 | goto out_unlock; | |
156 | default: | |
157 | retval = VM_FAULT_SIGBUS; | |
158 | goto out_unlock; | |
159 | } | |
160 | } | |
e024e110 | 161 | |
ba4e7d97 TH |
162 | /* |
163 | * Wait for buffer data in transit, due to a pipelined | |
164 | * move. | |
165 | */ | |
cbe12e74 TH |
166 | ret = ttm_bo_vm_fault_idle(bo, vma, vmf); |
167 | if (unlikely(ret != 0)) { | |
168 | retval = ret; | |
169 | goto out_unlock; | |
170 | } | |
ba4e7d97 | 171 | |
eba67093 TH |
172 | ret = ttm_mem_io_lock(man, true); |
173 | if (unlikely(ret != 0)) { | |
174 | retval = VM_FAULT_NOPAGE; | |
ba4e7d97 TH |
175 | goto out_unlock; |
176 | } | |
eba67093 TH |
177 | ret = ttm_mem_io_reserve_vm(bo); |
178 | if (unlikely(ret != 0)) { | |
179 | retval = VM_FAULT_SIGBUS; | |
180 | goto out_io_unlock; | |
181 | } | |
ba4e7d97 | 182 | |
ba4e7d97 | 183 | page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) + |
d3867355 TH |
184 | vma->vm_pgoff - drm_vma_node_start(&bo->vma_node); |
185 | page_last = vma_pages(vma) + vma->vm_pgoff - | |
186 | drm_vma_node_start(&bo->vma_node); | |
ba4e7d97 TH |
187 | |
188 | if (unlikely(page_offset >= bo->num_pages)) { | |
189 | retval = VM_FAULT_SIGBUS; | |
eba67093 | 190 | goto out_io_unlock; |
ba4e7d97 TH |
191 | } |
192 | ||
193 | /* | |
3943875e TH |
194 | * Make a local vma copy to modify the page_prot member |
195 | * and vm_flags if necessary. The vma parameter is protected | |
196 | * by mmap_sem in write mode. | |
ba4e7d97 | 197 | */ |
3943875e TH |
198 | cvma = *vma; |
199 | cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags); | |
200 | ||
82c5da6b | 201 | if (bo->mem.bus.is_iomem) { |
3943875e TH |
202 | cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, |
203 | cvma.vm_page_prot); | |
ba4e7d97 TH |
204 | } else { |
205 | ttm = bo->ttm; | |
94318d50 BH |
206 | cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, |
207 | cvma.vm_page_prot); | |
b1e5f172 JG |
208 | |
209 | /* Allocate all page at once, most common usage */ | |
210 | if (ttm->bdev->driver->ttm_tt_populate(ttm)) { | |
211 | retval = VM_FAULT_OOM; | |
212 | goto out_io_unlock; | |
213 | } | |
ba4e7d97 TH |
214 | } |
215 | ||
216 | /* | |
217 | * Speculatively prefault a number of pages. Only error on | |
218 | * first page. | |
219 | */ | |
ba4e7d97 | 220 | for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) { |
82c5da6b JG |
221 | if (bo->mem.bus.is_iomem) |
222 | pfn = ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) + page_offset; | |
ba4e7d97 | 223 | else { |
b1e5f172 | 224 | page = ttm->pages[page_offset]; |
ba4e7d97 TH |
225 | if (unlikely(!page && i == 0)) { |
226 | retval = VM_FAULT_OOM; | |
eba67093 | 227 | goto out_io_unlock; |
ba4e7d97 TH |
228 | } else if (unlikely(!page)) { |
229 | break; | |
230 | } | |
58aa6622 TH |
231 | page->mapping = vma->vm_file->f_mapping; |
232 | page->index = drm_vma_node_start(&bo->vma_node) + | |
233 | page_offset; | |
ba4e7d97 TH |
234 | pfn = page_to_pfn(page); |
235 | } | |
236 | ||
7dfe8b61 | 237 | if (vma->vm_flags & VM_MIXEDMAP) |
01c8f1c4 DW |
238 | ret = vm_insert_mixed(&cvma, address, |
239 | __pfn_to_pfn_t(pfn, PFN_DEV)); | |
7dfe8b61 TH |
240 | else |
241 | ret = vm_insert_pfn(&cvma, address, pfn); | |
242 | ||
ba4e7d97 TH |
243 | /* |
244 | * Somebody beat us to this PTE or prefaulting to | |
245 | * an already populated PTE, or prefaulting error. | |
246 | */ | |
247 | ||
248 | if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0))) | |
249 | break; | |
250 | else if (unlikely(ret != 0)) { | |
251 | retval = | |
252 | (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; | |
eba67093 | 253 | goto out_io_unlock; |
ba4e7d97 TH |
254 | } |
255 | ||
256 | address += PAGE_SIZE; | |
257 | if (unlikely(++page_offset >= page_last)) | |
258 | break; | |
259 | } | |
eba67093 TH |
260 | out_io_unlock: |
261 | ttm_mem_io_unlock(man); | |
ba4e7d97 TH |
262 | out_unlock: |
263 | ttm_bo_unreserve(bo); | |
264 | return retval; | |
265 | } | |
266 | ||
267 | static void ttm_bo_vm_open(struct vm_area_struct *vma) | |
268 | { | |
269 | struct ttm_buffer_object *bo = | |
270 | (struct ttm_buffer_object *)vma->vm_private_data; | |
271 | ||
58aa6622 TH |
272 | WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping); |
273 | ||
ba4e7d97 TH |
274 | (void)ttm_bo_reference(bo); |
275 | } | |
276 | ||
277 | static void ttm_bo_vm_close(struct vm_area_struct *vma) | |
278 | { | |
82c5da6b | 279 | struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data; |
ba4e7d97 TH |
280 | |
281 | ttm_bo_unref(&bo); | |
282 | vma->vm_private_data = NULL; | |
283 | } | |
284 | ||
f0f37e2f | 285 | static const struct vm_operations_struct ttm_bo_vm_ops = { |
ba4e7d97 TH |
286 | .fault = ttm_bo_vm_fault, |
287 | .open = ttm_bo_vm_open, | |
288 | .close = ttm_bo_vm_close | |
289 | }; | |
290 | ||
72525b3f DH |
291 | static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev, |
292 | unsigned long offset, | |
293 | unsigned long pages) | |
294 | { | |
295 | struct drm_vma_offset_node *node; | |
296 | struct ttm_buffer_object *bo = NULL; | |
297 | ||
298 | drm_vma_offset_lock_lookup(&bdev->vma_manager); | |
299 | ||
300 | node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages); | |
301 | if (likely(node)) { | |
302 | bo = container_of(node, struct ttm_buffer_object, vma_node); | |
303 | if (!kref_get_unless_zero(&bo->kref)) | |
304 | bo = NULL; | |
305 | } | |
306 | ||
307 | drm_vma_offset_unlock_lookup(&bdev->vma_manager); | |
308 | ||
309 | if (!bo) | |
310 | pr_err("Could not find buffer object to map\n"); | |
311 | ||
312 | return bo; | |
313 | } | |
314 | ||
ba4e7d97 TH |
315 | int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma, |
316 | struct ttm_bo_device *bdev) | |
317 | { | |
318 | struct ttm_bo_driver *driver; | |
319 | struct ttm_buffer_object *bo; | |
320 | int ret; | |
321 | ||
72525b3f DH |
322 | bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma)); |
323 | if (unlikely(!bo)) | |
ba4e7d97 | 324 | return -EINVAL; |
ba4e7d97 TH |
325 | |
326 | driver = bo->bdev->driver; | |
327 | if (unlikely(!driver->verify_access)) { | |
328 | ret = -EPERM; | |
329 | goto out_unref; | |
330 | } | |
331 | ret = driver->verify_access(bo, filp); | |
332 | if (unlikely(ret != 0)) | |
333 | goto out_unref; | |
334 | ||
335 | vma->vm_ops = &ttm_bo_vm_ops; | |
336 | ||
337 | /* | |
338 | * Note: We're transferring the bo reference to | |
339 | * vma->vm_private_data here. | |
340 | */ | |
341 | ||
342 | vma->vm_private_data = bo; | |
7dfe8b61 TH |
343 | |
344 | /* | |
0e6d6ec0 TH |
345 | * We'd like to use VM_PFNMAP on shared mappings, where |
346 | * (vma->vm_flags & VM_SHARED) != 0, for performance reasons, | |
347 | * but for some reason VM_PFNMAP + x86 PAT + write-combine is very | |
348 | * bad for performance. Until that has been sorted out, use | |
349 | * VM_MIXEDMAP on all mappings. See freedesktop.org bug #75719 | |
7dfe8b61 | 350 | */ |
0e6d6ec0 | 351 | vma->vm_flags |= VM_MIXEDMAP; |
7dfe8b61 | 352 | vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; |
ba4e7d97 TH |
353 | return 0; |
354 | out_unref: | |
355 | ttm_bo_unref(&bo); | |
356 | return ret; | |
357 | } | |
358 | EXPORT_SYMBOL(ttm_bo_mmap); | |
359 | ||
360 | int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo) | |
361 | { | |
362 | if (vma->vm_pgoff != 0) | |
363 | return -EACCES; | |
364 | ||
365 | vma->vm_ops = &ttm_bo_vm_ops; | |
366 | vma->vm_private_data = ttm_bo_reference(bo); | |
0e6d6ec0 | 367 | vma->vm_flags |= VM_MIXEDMAP; |
7dfe8b61 | 368 | vma->vm_flags |= VM_IO | VM_DONTEXPAND; |
ba4e7d97 TH |
369 | return 0; |
370 | } | |
371 | EXPORT_SYMBOL(ttm_fbdev_mmap); |