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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#define pr_fmt(fmt) "[TTM] " fmt
32
33#include <drm/ttm/ttm_module.h>
34#include <drm/ttm/ttm_bo_driver.h>
35#include <drm/ttm/ttm_placement.h>
36#include <drm/drm_vma_manager.h>
37#include <linux/mm.h>
38#include <linux/pfn_t.h>
39#include <linux/rbtree.h>
40#include <linux/module.h>
41#include <linux/uaccess.h>
42#include <linux/mem_encrypt.h>
43
44#define TTM_BO_VM_NUM_PREFAULT 16
45
46static int ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo,
47 struct vm_fault *vmf)
48{
49 int ret = 0;
50
51 if (likely(!bo->moving))
52 goto out_unlock;
53
54 /*
55 * Quick non-stalling check for idle.
56 */
57 if (dma_fence_is_signaled(bo->moving))
58 goto out_clear;
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 ttm_bo_reference(bo);
70 up_read(&vmf->vma->vm_mm->mmap_sem);
71 (void) dma_fence_wait(bo->moving, true);
72 ttm_bo_unreserve(bo);
73 ttm_bo_unref(&bo);
74 goto out_unlock;
75 }
76
77 /*
78 * Ordinary wait.
79 */
80 ret = dma_fence_wait(bo->moving, true);
81 if (unlikely(ret != 0)) {
82 ret = (ret != -ERESTARTSYS) ? VM_FAULT_SIGBUS :
83 VM_FAULT_NOPAGE;
84 goto out_unlock;
85 }
86
87out_clear:
88 dma_fence_put(bo->moving);
89 bo->moving = NULL;
90
91out_unlock:
92 return ret;
93}
94
95static unsigned long ttm_bo_io_mem_pfn(struct ttm_buffer_object *bo,
96 unsigned long page_offset)
97{
98 struct ttm_bo_device *bdev = bo->bdev;
99
100 if (bdev->driver->io_mem_pfn)
101 return bdev->driver->io_mem_pfn(bo, page_offset);
102
103 return ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT)
104 + page_offset;
105}
106
107static int ttm_bo_vm_fault(struct vm_fault *vmf)
108{
109 struct vm_area_struct *vma = vmf->vma;
110 struct ttm_buffer_object *bo = (struct ttm_buffer_object *)
111 vma->vm_private_data;
112 struct ttm_bo_device *bdev = bo->bdev;
113 unsigned long page_offset;
114 unsigned long page_last;
115 unsigned long pfn;
116 struct ttm_tt *ttm = NULL;
117 struct page *page;
118 int ret;
119 int i;
120 unsigned long address = vmf->address;
121 struct ttm_mem_type_manager *man =
122 &bdev->man[bo->mem.mem_type];
123 struct vm_area_struct cvma;
124
125 /*
126 * Work around locking order reversal in fault / nopfn
127 * between mmap_sem and bo_reserve: Perform a trylock operation
128 * for reserve, and if it fails, retry the fault after waiting
129 * for the buffer to become unreserved.
130 */
131 ret = ttm_bo_reserve(bo, true, true, NULL);
132 if (unlikely(ret != 0)) {
133 if (ret != -EBUSY)
134 return VM_FAULT_NOPAGE;
135
136 if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
137 if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
138 ttm_bo_reference(bo);
139 up_read(&vmf->vma->vm_mm->mmap_sem);
140 (void) ttm_bo_wait_unreserved(bo);
141 ttm_bo_unref(&bo);
142 }
143
144 return VM_FAULT_RETRY;
145 }
146
147 /*
148 * If we'd want to change locking order to
149 * mmap_sem -> bo::reserve, we'd use a blocking reserve here
150 * instead of retrying the fault...
151 */
152 return VM_FAULT_NOPAGE;
153 }
154
155 /*
156 * Refuse to fault imported pages. This should be handled
157 * (if at all) by redirecting mmap to the exporter.
158 */
159 if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
160 ret = VM_FAULT_SIGBUS;
161 goto out_unlock;
162 }
163
164 if (bdev->driver->fault_reserve_notify) {
165 ret = bdev->driver->fault_reserve_notify(bo);
166 switch (ret) {
167 case 0:
168 break;
169 case -EBUSY:
170 case -ERESTARTSYS:
171 ret = VM_FAULT_NOPAGE;
172 goto out_unlock;
173 default:
174 ret = VM_FAULT_SIGBUS;
175 goto out_unlock;
176 }
177 }
178
179 /*
180 * Wait for buffer data in transit, due to a pipelined
181 * move.
182 */
183 ret = ttm_bo_vm_fault_idle(bo, vmf);
184 if (unlikely(ret != 0)) {
185 if (ret == VM_FAULT_RETRY &&
186 !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
187 /* The BO has already been unreserved. */
188 return ret;
189 }
190
191 goto out_unlock;
192 }
193
194 ret = ttm_mem_io_lock(man, true);
195 if (unlikely(ret != 0)) {
196 ret = VM_FAULT_NOPAGE;
197 goto out_unlock;
198 }
199 ret = ttm_mem_io_reserve_vm(bo);
200 if (unlikely(ret != 0)) {
201 ret = VM_FAULT_SIGBUS;
202 goto out_io_unlock;
203 }
204
205 page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
206 vma->vm_pgoff - drm_vma_node_start(&bo->vma_node);
207 page_last = vma_pages(vma) + vma->vm_pgoff -
208 drm_vma_node_start(&bo->vma_node);
209
210 if (unlikely(page_offset >= bo->num_pages)) {
211 ret = VM_FAULT_SIGBUS;
212 goto out_io_unlock;
213 }
214
215 /*
216 * Make a local vma copy to modify the page_prot member
217 * and vm_flags if necessary. The vma parameter is protected
218 * by mmap_sem in write mode.
219 */
220 cvma = *vma;
221 cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags);
222
223 if (bo->mem.bus.is_iomem) {
224 cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
225 cvma.vm_page_prot);
226 } else {
227 struct ttm_operation_ctx ctx = {
228 .interruptible = false,
229 .no_wait_gpu = false,
230 .flags = TTM_OPT_FLAG_FORCE_ALLOC
231
232 };
233
234 ttm = bo->ttm;
235 cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
236 cvma.vm_page_prot);
237
238 /* Allocate all page at once, most common usage */
239 if (ttm_tt_populate(ttm, &ctx)) {
240 ret = VM_FAULT_OOM;
241 goto out_io_unlock;
242 }
243 }
244
245 /*
246 * Speculatively prefault a number of pages. Only error on
247 * first page.
248 */
249 for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) {
250 if (bo->mem.bus.is_iomem) {
251 /* Iomem should not be marked encrypted */
252 cvma.vm_page_prot = pgprot_decrypted(cvma.vm_page_prot);
253 pfn = ttm_bo_io_mem_pfn(bo, page_offset);
254 } else {
255 page = ttm->pages[page_offset];
256 if (unlikely(!page && i == 0)) {
257 ret = VM_FAULT_OOM;
258 goto out_io_unlock;
259 } else if (unlikely(!page)) {
260 break;
261 }
262 page->index = drm_vma_node_start(&bo->vma_node) +
263 page_offset;
264 pfn = page_to_pfn(page);
265 }
266
267 if (vma->vm_flags & VM_MIXEDMAP)
268 ret = vm_insert_mixed(&cvma, address,
269 __pfn_to_pfn_t(pfn, PFN_DEV));
270 else
271 ret = vm_insert_pfn(&cvma, address, pfn);
272
273 /*
274 * Somebody beat us to this PTE or prefaulting to
275 * an already populated PTE, or prefaulting error.
276 */
277
278 if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0)))
279 break;
280 else if (unlikely(ret != 0)) {
281 ret =
282 (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
283 goto out_io_unlock;
284 }
285
286 address += PAGE_SIZE;
287 if (unlikely(++page_offset >= page_last))
288 break;
289 }
290 ret = VM_FAULT_NOPAGE;
291out_io_unlock:
292 ttm_mem_io_unlock(man);
293out_unlock:
294 ttm_bo_unreserve(bo);
295 return ret;
296}
297
298static void ttm_bo_vm_open(struct vm_area_struct *vma)
299{
300 struct ttm_buffer_object *bo =
301 (struct ttm_buffer_object *)vma->vm_private_data;
302
303 WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping);
304
305 (void)ttm_bo_reference(bo);
306}
307
308static void ttm_bo_vm_close(struct vm_area_struct *vma)
309{
310 struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data;
311
312 ttm_bo_unref(&bo);
313 vma->vm_private_data = NULL;
314}
315
316static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo,
317 unsigned long offset,
318 uint8_t *buf, int len, int write)
319{
320 unsigned long page = offset >> PAGE_SHIFT;
321 unsigned long bytes_left = len;
322 int ret;
323
324 /* Copy a page at a time, that way no extra virtual address
325 * mapping is needed
326 */
327 offset -= page << PAGE_SHIFT;
328 do {
329 unsigned long bytes = min(bytes_left, PAGE_SIZE - offset);
330 struct ttm_bo_kmap_obj map;
331 void *ptr;
332 bool is_iomem;
333
334 ret = ttm_bo_kmap(bo, page, 1, &map);
335 if (ret)
336 return ret;
337
338 ptr = (uint8_t *)ttm_kmap_obj_virtual(&map, &is_iomem) + offset;
339 WARN_ON_ONCE(is_iomem);
340 if (write)
341 memcpy(ptr, buf, bytes);
342 else
343 memcpy(buf, ptr, bytes);
344 ttm_bo_kunmap(&map);
345
346 page++;
347 buf += bytes;
348 bytes_left -= bytes;
349 offset = 0;
350 } while (bytes_left);
351
352 return len;
353}
354
355static int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
356 void *buf, int len, int write)
357{
358 unsigned long offset = (addr) - vma->vm_start;
359 struct ttm_buffer_object *bo = vma->vm_private_data;
360 int ret;
361
362 if (len < 1 || (offset + len) >> PAGE_SHIFT > bo->num_pages)
363 return -EIO;
364
365 ret = ttm_bo_reserve(bo, true, false, NULL);
366 if (ret)
367 return ret;
368
369 switch (bo->mem.mem_type) {
370 case TTM_PL_SYSTEM:
371 if (unlikely(bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
372 ret = ttm_tt_swapin(bo->ttm);
373 if (unlikely(ret != 0))
374 return ret;
375 }
376 /* fall through */
377 case TTM_PL_TT:
378 ret = ttm_bo_vm_access_kmap(bo, offset, buf, len, write);
379 break;
380 default:
381 if (bo->bdev->driver->access_memory)
382 ret = bo->bdev->driver->access_memory(
383 bo, offset, buf, len, write);
384 else
385 ret = -EIO;
386 }
387
388 ttm_bo_unreserve(bo);
389
390 return ret;
391}
392
393static const struct vm_operations_struct ttm_bo_vm_ops = {
394 .fault = ttm_bo_vm_fault,
395 .open = ttm_bo_vm_open,
396 .close = ttm_bo_vm_close,
397 .access = ttm_bo_vm_access
398};
399
400static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev,
401 unsigned long offset,
402 unsigned long pages)
403{
404 struct drm_vma_offset_node *node;
405 struct ttm_buffer_object *bo = NULL;
406
407 drm_vma_offset_lock_lookup(&bdev->vma_manager);
408
409 node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages);
410 if (likely(node)) {
411 bo = container_of(node, struct ttm_buffer_object, vma_node);
412 if (!kref_get_unless_zero(&bo->kref))
413 bo = NULL;
414 }
415
416 drm_vma_offset_unlock_lookup(&bdev->vma_manager);
417
418 if (!bo)
419 pr_err("Could not find buffer object to map\n");
420
421 return bo;
422}
423
424int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
425 struct ttm_bo_device *bdev)
426{
427 struct ttm_bo_driver *driver;
428 struct ttm_buffer_object *bo;
429 int ret;
430
431 bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
432 if (unlikely(!bo))
433 return -EINVAL;
434
435 driver = bo->bdev->driver;
436 if (unlikely(!driver->verify_access)) {
437 ret = -EPERM;
438 goto out_unref;
439 }
440 ret = driver->verify_access(bo, filp);
441 if (unlikely(ret != 0))
442 goto out_unref;
443
444 vma->vm_ops = &ttm_bo_vm_ops;
445
446 /*
447 * Note: We're transferring the bo reference to
448 * vma->vm_private_data here.
449 */
450
451 vma->vm_private_data = bo;
452
453 /*
454 * We'd like to use VM_PFNMAP on shared mappings, where
455 * (vma->vm_flags & VM_SHARED) != 0, for performance reasons,
456 * but for some reason VM_PFNMAP + x86 PAT + write-combine is very
457 * bad for performance. Until that has been sorted out, use
458 * VM_MIXEDMAP on all mappings. See freedesktop.org bug #75719
459 */
460 vma->vm_flags |= VM_MIXEDMAP;
461 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
462 return 0;
463out_unref:
464 ttm_bo_unref(&bo);
465 return ret;
466}
467EXPORT_SYMBOL(ttm_bo_mmap);
468
469int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
470{
471 if (vma->vm_pgoff != 0)
472 return -EACCES;
473
474 vma->vm_ops = &ttm_bo_vm_ops;
475 vma->vm_private_data = ttm_bo_reference(bo);
476 vma->vm_flags |= VM_MIXEDMAP;
477 vma->vm_flags |= VM_IO | VM_DONTEXPAND;
478 return 0;
479}
480EXPORT_SYMBOL(ttm_fbdev_mmap);
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#define pr_fmt(fmt) "[TTM] " fmt
32
33#include <ttm/ttm_module.h>
34#include <ttm/ttm_bo_driver.h>
35#include <ttm/ttm_placement.h>
36#include <drm/drm_vma_manager.h>
37#include <linux/mm.h>
38#include <linux/pfn_t.h>
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
45static int ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo,
46 struct vm_area_struct *vma,
47 struct vm_fault *vmf)
48{
49 int ret = 0;
50
51 if (likely(!bo->moving))
52 goto out_unlock;
53
54 /*
55 * Quick non-stalling check for idle.
56 */
57 if (dma_fence_is_signaled(bo->moving))
58 goto out_clear;
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);
70 (void) dma_fence_wait(bo->moving, true);
71 goto out_unlock;
72 }
73
74 /*
75 * Ordinary wait.
76 */
77 ret = dma_fence_wait(bo->moving, true);
78 if (unlikely(ret != 0)) {
79 ret = (ret != -ERESTARTSYS) ? VM_FAULT_SIGBUS :
80 VM_FAULT_NOPAGE;
81 goto out_unlock;
82 }
83
84out_clear:
85 dma_fence_put(bo->moving);
86 bo->moving = NULL;
87
88out_unlock:
89 return ret;
90}
91
92static 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;
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;
104 unsigned long address = vmf->address;
105 int retval = VM_FAULT_NOPAGE;
106 struct ttm_mem_type_manager *man =
107 &bdev->man[bo->mem.mem_type];
108 struct vm_area_struct cvma;
109
110 /*
111 * Work around locking order reversal in fault / nopfn
112 * between mmap_sem and bo_reserve: Perform a trylock operation
113 * for reserve, and if it fails, retry the fault after waiting
114 * for the buffer to become unreserved.
115 */
116 ret = ttm_bo_reserve(bo, true, true, NULL);
117 if (unlikely(ret != 0)) {
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 */
135 return VM_FAULT_NOPAGE;
136 }
137
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
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:
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 }
161
162 /*
163 * Wait for buffer data in transit, due to a pipelined
164 * move.
165 */
166 ret = ttm_bo_vm_fault_idle(bo, vma, vmf);
167 if (unlikely(ret != 0)) {
168 retval = ret;
169 goto out_unlock;
170 }
171
172 ret = ttm_mem_io_lock(man, true);
173 if (unlikely(ret != 0)) {
174 retval = VM_FAULT_NOPAGE;
175 goto out_unlock;
176 }
177 ret = ttm_mem_io_reserve_vm(bo);
178 if (unlikely(ret != 0)) {
179 retval = VM_FAULT_SIGBUS;
180 goto out_io_unlock;
181 }
182
183 page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
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);
187
188 if (unlikely(page_offset >= bo->num_pages)) {
189 retval = VM_FAULT_SIGBUS;
190 goto out_io_unlock;
191 }
192
193 /*
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.
197 */
198 cvma = *vma;
199 cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags);
200
201 if (bo->mem.bus.is_iomem) {
202 cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
203 cvma.vm_page_prot);
204 } else {
205 ttm = bo->ttm;
206 cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
207 cvma.vm_page_prot);
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 }
214 }
215
216 /*
217 * Speculatively prefault a number of pages. Only error on
218 * first page.
219 */
220 for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) {
221 if (bo->mem.bus.is_iomem)
222 pfn = ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) + page_offset;
223 else {
224 page = ttm->pages[page_offset];
225 if (unlikely(!page && i == 0)) {
226 retval = VM_FAULT_OOM;
227 goto out_io_unlock;
228 } else if (unlikely(!page)) {
229 break;
230 }
231 page->mapping = vma->vm_file->f_mapping;
232 page->index = drm_vma_node_start(&bo->vma_node) +
233 page_offset;
234 pfn = page_to_pfn(page);
235 }
236
237 if (vma->vm_flags & VM_MIXEDMAP)
238 ret = vm_insert_mixed(&cvma, address,
239 __pfn_to_pfn_t(pfn, PFN_DEV));
240 else
241 ret = vm_insert_pfn(&cvma, address, pfn);
242
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;
253 goto out_io_unlock;
254 }
255
256 address += PAGE_SIZE;
257 if (unlikely(++page_offset >= page_last))
258 break;
259 }
260out_io_unlock:
261 ttm_mem_io_unlock(man);
262out_unlock:
263 ttm_bo_unreserve(bo);
264 return retval;
265}
266
267static 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
272 WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping);
273
274 (void)ttm_bo_reference(bo);
275}
276
277static void ttm_bo_vm_close(struct vm_area_struct *vma)
278{
279 struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data;
280
281 ttm_bo_unref(&bo);
282 vma->vm_private_data = NULL;
283}
284
285static const struct vm_operations_struct ttm_bo_vm_ops = {
286 .fault = ttm_bo_vm_fault,
287 .open = ttm_bo_vm_open,
288 .close = ttm_bo_vm_close
289};
290
291static 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
315int 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
322 bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
323 if (unlikely(!bo))
324 return -EINVAL;
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;
343
344 /*
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
350 */
351 vma->vm_flags |= VM_MIXEDMAP;
352 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
353 return 0;
354out_unref:
355 ttm_bo_unref(&bo);
356 return ret;
357}
358EXPORT_SYMBOL(ttm_bo_mmap);
359
360int 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);
367 vma->vm_flags |= VM_MIXEDMAP;
368 vma->vm_flags |= VM_IO | VM_DONTEXPAND;
369 return 0;
370}
371EXPORT_SYMBOL(ttm_fbdev_mmap);