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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]; | |
ba4e7d97 TH |
105 | |
106 | /* | |
107 | * Work around locking order reversal in fault / nopfn | |
108 | * between mmap_sem and bo_reserve: Perform a trylock operation | |
109 | * for reserve, and if it fails, retry the fault after scheduling. | |
110 | */ | |
111 | ||
112 | ret = ttm_bo_reserve(bo, true, true, false, 0); | |
113 | if (unlikely(ret != 0)) { | |
114 | if (ret == -EBUSY) | |
115 | set_need_resched(); | |
116 | return VM_FAULT_NOPAGE; | |
117 | } | |
118 | ||
82c5da6b JG |
119 | if (bdev->driver->fault_reserve_notify) { |
120 | ret = bdev->driver->fault_reserve_notify(bo); | |
121 | switch (ret) { | |
122 | case 0: | |
123 | break; | |
124 | case -EBUSY: | |
125 | set_need_resched(); | |
126 | case -ERESTARTSYS: | |
127 | retval = VM_FAULT_NOPAGE; | |
128 | goto out_unlock; | |
129 | default: | |
130 | retval = VM_FAULT_SIGBUS; | |
131 | goto out_unlock; | |
132 | } | |
133 | } | |
e024e110 | 134 | |
ba4e7d97 TH |
135 | /* |
136 | * Wait for buffer data in transit, due to a pipelined | |
137 | * move. | |
138 | */ | |
cbe12e74 TH |
139 | ret = ttm_bo_vm_fault_idle(bo, vma, vmf); |
140 | if (unlikely(ret != 0)) { | |
141 | retval = ret; | |
142 | goto out_unlock; | |
143 | } | |
ba4e7d97 | 144 | |
eba67093 TH |
145 | ret = ttm_mem_io_lock(man, true); |
146 | if (unlikely(ret != 0)) { | |
147 | retval = VM_FAULT_NOPAGE; | |
ba4e7d97 TH |
148 | goto out_unlock; |
149 | } | |
eba67093 TH |
150 | ret = ttm_mem_io_reserve_vm(bo); |
151 | if (unlikely(ret != 0)) { | |
152 | retval = VM_FAULT_SIGBUS; | |
153 | goto out_io_unlock; | |
154 | } | |
ba4e7d97 | 155 | |
ba4e7d97 | 156 | page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) + |
72525b3f | 157 | drm_vma_node_start(&bo->vma_node) - vma->vm_pgoff; |
025df775 | 158 | page_last = vma_pages(vma) + |
72525b3f | 159 | drm_vma_node_start(&bo->vma_node) - vma->vm_pgoff; |
ba4e7d97 TH |
160 | |
161 | if (unlikely(page_offset >= bo->num_pages)) { | |
162 | retval = VM_FAULT_SIGBUS; | |
eba67093 | 163 | goto out_io_unlock; |
ba4e7d97 TH |
164 | } |
165 | ||
166 | /* | |
167 | * Strictly, we're not allowed to modify vma->vm_page_prot here, | |
168 | * since the mmap_sem is only held in read mode. However, we | |
169 | * modify only the caching bits of vma->vm_page_prot and | |
170 | * consider those bits protected by | |
171 | * the bo->mutex, as we should be the only writers. | |
172 | * There shouldn't really be any readers of these bits except | |
173 | * within vm_insert_mixed()? fork? | |
174 | * | |
175 | * TODO: Add a list of vmas to the bo, and change the | |
176 | * vma->vm_page_prot when the object changes caching policy, with | |
177 | * the correct locks held. | |
178 | */ | |
82c5da6b | 179 | if (bo->mem.bus.is_iomem) { |
ba4e7d97 TH |
180 | vma->vm_page_prot = ttm_io_prot(bo->mem.placement, |
181 | vma->vm_page_prot); | |
182 | } else { | |
183 | ttm = bo->ttm; | |
184 | vma->vm_page_prot = (bo->mem.placement & TTM_PL_FLAG_CACHED) ? | |
185 | vm_get_page_prot(vma->vm_flags) : | |
186 | ttm_io_prot(bo->mem.placement, vma->vm_page_prot); | |
b1e5f172 JG |
187 | |
188 | /* Allocate all page at once, most common usage */ | |
189 | if (ttm->bdev->driver->ttm_tt_populate(ttm)) { | |
190 | retval = VM_FAULT_OOM; | |
191 | goto out_io_unlock; | |
192 | } | |
ba4e7d97 TH |
193 | } |
194 | ||
195 | /* | |
196 | * Speculatively prefault a number of pages. Only error on | |
197 | * first page. | |
198 | */ | |
ba4e7d97 | 199 | for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) { |
82c5da6b JG |
200 | if (bo->mem.bus.is_iomem) |
201 | pfn = ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) + page_offset; | |
ba4e7d97 | 202 | else { |
b1e5f172 | 203 | page = ttm->pages[page_offset]; |
ba4e7d97 TH |
204 | if (unlikely(!page && i == 0)) { |
205 | retval = VM_FAULT_OOM; | |
eba67093 | 206 | goto out_io_unlock; |
ba4e7d97 TH |
207 | } else if (unlikely(!page)) { |
208 | break; | |
209 | } | |
210 | pfn = page_to_pfn(page); | |
211 | } | |
212 | ||
213 | ret = vm_insert_mixed(vma, address, pfn); | |
214 | /* | |
215 | * Somebody beat us to this PTE or prefaulting to | |
216 | * an already populated PTE, or prefaulting error. | |
217 | */ | |
218 | ||
219 | if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0))) | |
220 | break; | |
221 | else if (unlikely(ret != 0)) { | |
222 | retval = | |
223 | (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; | |
eba67093 | 224 | goto out_io_unlock; |
ba4e7d97 TH |
225 | } |
226 | ||
227 | address += PAGE_SIZE; | |
228 | if (unlikely(++page_offset >= page_last)) | |
229 | break; | |
230 | } | |
eba67093 TH |
231 | out_io_unlock: |
232 | ttm_mem_io_unlock(man); | |
ba4e7d97 TH |
233 | out_unlock: |
234 | ttm_bo_unreserve(bo); | |
235 | return retval; | |
236 | } | |
237 | ||
238 | static void ttm_bo_vm_open(struct vm_area_struct *vma) | |
239 | { | |
240 | struct ttm_buffer_object *bo = | |
241 | (struct ttm_buffer_object *)vma->vm_private_data; | |
242 | ||
243 | (void)ttm_bo_reference(bo); | |
244 | } | |
245 | ||
246 | static void ttm_bo_vm_close(struct vm_area_struct *vma) | |
247 | { | |
82c5da6b | 248 | struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data; |
ba4e7d97 TH |
249 | |
250 | ttm_bo_unref(&bo); | |
251 | vma->vm_private_data = NULL; | |
252 | } | |
253 | ||
f0f37e2f | 254 | static const struct vm_operations_struct ttm_bo_vm_ops = { |
ba4e7d97 TH |
255 | .fault = ttm_bo_vm_fault, |
256 | .open = ttm_bo_vm_open, | |
257 | .close = ttm_bo_vm_close | |
258 | }; | |
259 | ||
72525b3f DH |
260 | static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev, |
261 | unsigned long offset, | |
262 | unsigned long pages) | |
263 | { | |
264 | struct drm_vma_offset_node *node; | |
265 | struct ttm_buffer_object *bo = NULL; | |
266 | ||
267 | drm_vma_offset_lock_lookup(&bdev->vma_manager); | |
268 | ||
269 | node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages); | |
270 | if (likely(node)) { | |
271 | bo = container_of(node, struct ttm_buffer_object, vma_node); | |
272 | if (!kref_get_unless_zero(&bo->kref)) | |
273 | bo = NULL; | |
274 | } | |
275 | ||
276 | drm_vma_offset_unlock_lookup(&bdev->vma_manager); | |
277 | ||
278 | if (!bo) | |
279 | pr_err("Could not find buffer object to map\n"); | |
280 | ||
281 | return bo; | |
282 | } | |
283 | ||
ba4e7d97 TH |
284 | int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma, |
285 | struct ttm_bo_device *bdev) | |
286 | { | |
287 | struct ttm_bo_driver *driver; | |
288 | struct ttm_buffer_object *bo; | |
289 | int ret; | |
290 | ||
72525b3f DH |
291 | bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma)); |
292 | if (unlikely(!bo)) | |
ba4e7d97 | 293 | return -EINVAL; |
ba4e7d97 TH |
294 | |
295 | driver = bo->bdev->driver; | |
296 | if (unlikely(!driver->verify_access)) { | |
297 | ret = -EPERM; | |
298 | goto out_unref; | |
299 | } | |
300 | ret = driver->verify_access(bo, filp); | |
301 | if (unlikely(ret != 0)) | |
302 | goto out_unref; | |
303 | ||
304 | vma->vm_ops = &ttm_bo_vm_ops; | |
305 | ||
306 | /* | |
307 | * Note: We're transferring the bo reference to | |
308 | * vma->vm_private_data here. | |
309 | */ | |
310 | ||
311 | vma->vm_private_data = bo; | |
314e51b9 | 312 | vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP; |
ba4e7d97 TH |
313 | return 0; |
314 | out_unref: | |
315 | ttm_bo_unref(&bo); | |
316 | return ret; | |
317 | } | |
318 | EXPORT_SYMBOL(ttm_bo_mmap); | |
319 | ||
320 | int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo) | |
321 | { | |
322 | if (vma->vm_pgoff != 0) | |
323 | return -EACCES; | |
324 | ||
325 | vma->vm_ops = &ttm_bo_vm_ops; | |
326 | vma->vm_private_data = ttm_bo_reference(bo); | |
314e51b9 | 327 | vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND; |
ba4e7d97 TH |
328 | return 0; |
329 | } | |
330 | EXPORT_SYMBOL(ttm_fbdev_mmap); |