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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 <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(!test_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags)))
52 goto out_unlock;
53
54 /*
55 * Quick non-stalling check for idle.
56 */
57 ret = ttm_bo_wait(bo, false, false, true);
58 if (likely(ret == 0))
59 goto out_unlock;
60
61 /*
62 * If possible, avoid waiting for GPU with mmap_sem
63 * held.
64 */
65 if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
66 ret = VM_FAULT_RETRY;
67 if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT)
68 goto out_unlock;
69
70 up_read(&vma->vm_mm->mmap_sem);
71 (void) ttm_bo_wait(bo, false, true, false);
72 goto out_unlock;
73 }
74
75 /*
76 * Ordinary wait.
77 */
78 ret = ttm_bo_wait(bo, false, true, false);
79 if (unlikely(ret != 0))
80 ret = (ret != -ERESTARTSYS) ? VM_FAULT_SIGBUS :
81 VM_FAULT_NOPAGE;
82
83out_unlock:
84 return ret;
85}
86
87static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
88{
89 struct ttm_buffer_object *bo = (struct ttm_buffer_object *)
90 vma->vm_private_data;
91 struct ttm_bo_device *bdev = bo->bdev;
92 unsigned long page_offset;
93 unsigned long page_last;
94 unsigned long pfn;
95 struct ttm_tt *ttm = NULL;
96 struct page *page;
97 int ret;
98 int i;
99 unsigned long address = (unsigned long)vmf->virtual_address;
100 int retval = VM_FAULT_NOPAGE;
101 struct ttm_mem_type_manager *man =
102 &bdev->man[bo->mem.mem_type];
103 struct vm_area_struct cvma;
104
105 /*
106 * Work around locking order reversal in fault / nopfn
107 * between mmap_sem and bo_reserve: Perform a trylock operation
108 * for reserve, and if it fails, retry the fault after waiting
109 * for the buffer to become unreserved.
110 */
111 ret = ttm_bo_reserve(bo, true, true, false, NULL);
112 if (unlikely(ret != 0)) {
113 if (ret != -EBUSY)
114 return VM_FAULT_NOPAGE;
115
116 if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
117 if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
118 up_read(&vma->vm_mm->mmap_sem);
119 (void) ttm_bo_wait_unreserved(bo);
120 }
121
122 return VM_FAULT_RETRY;
123 }
124
125 /*
126 * If we'd want to change locking order to
127 * mmap_sem -> bo::reserve, we'd use a blocking reserve here
128 * instead of retrying the fault...
129 */
130 return VM_FAULT_NOPAGE;
131 }
132
133 /*
134 * Refuse to fault imported pages. This should be handled
135 * (if at all) by redirecting mmap to the exporter.
136 */
137 if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
138 retval = VM_FAULT_SIGBUS;
139 goto out_unlock;
140 }
141
142 if (bdev->driver->fault_reserve_notify) {
143 ret = bdev->driver->fault_reserve_notify(bo);
144 switch (ret) {
145 case 0:
146 break;
147 case -EBUSY:
148 case -ERESTARTSYS:
149 retval = VM_FAULT_NOPAGE;
150 goto out_unlock;
151 default:
152 retval = VM_FAULT_SIGBUS;
153 goto out_unlock;
154 }
155 }
156
157 /*
158 * Wait for buffer data in transit, due to a pipelined
159 * move.
160 */
161 ret = ttm_bo_vm_fault_idle(bo, vma, vmf);
162 if (unlikely(ret != 0)) {
163 retval = ret;
164 goto out_unlock;
165 }
166
167 ret = ttm_mem_io_lock(man, true);
168 if (unlikely(ret != 0)) {
169 retval = VM_FAULT_NOPAGE;
170 goto out_unlock;
171 }
172 ret = ttm_mem_io_reserve_vm(bo);
173 if (unlikely(ret != 0)) {
174 retval = VM_FAULT_SIGBUS;
175 goto out_io_unlock;
176 }
177
178 page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
179 vma->vm_pgoff - drm_vma_node_start(&bo->vma_node);
180 page_last = vma_pages(vma) + vma->vm_pgoff -
181 drm_vma_node_start(&bo->vma_node);
182
183 if (unlikely(page_offset >= bo->num_pages)) {
184 retval = VM_FAULT_SIGBUS;
185 goto out_io_unlock;
186 }
187
188 /*
189 * Make a local vma copy to modify the page_prot member
190 * and vm_flags if necessary. The vma parameter is protected
191 * by mmap_sem in write mode.
192 */
193 cvma = *vma;
194 cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags);
195
196 if (bo->mem.bus.is_iomem) {
197 cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
198 cvma.vm_page_prot);
199 } else {
200 ttm = bo->ttm;
201 cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
202 cvma.vm_page_prot);
203
204 /* Allocate all page at once, most common usage */
205 if (ttm->bdev->driver->ttm_tt_populate(ttm)) {
206 retval = VM_FAULT_OOM;
207 goto out_io_unlock;
208 }
209 }
210
211 /*
212 * Speculatively prefault a number of pages. Only error on
213 * first page.
214 */
215 for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) {
216 if (bo->mem.bus.is_iomem)
217 pfn = ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) + page_offset;
218 else {
219 page = ttm->pages[page_offset];
220 if (unlikely(!page && i == 0)) {
221 retval = VM_FAULT_OOM;
222 goto out_io_unlock;
223 } else if (unlikely(!page)) {
224 break;
225 }
226 page->mapping = vma->vm_file->f_mapping;
227 page->index = drm_vma_node_start(&bo->vma_node) +
228 page_offset;
229 pfn = page_to_pfn(page);
230 }
231
232 if (vma->vm_flags & VM_MIXEDMAP)
233 ret = vm_insert_mixed(&cvma, address,
234 __pfn_to_pfn_t(pfn, PFN_DEV));
235 else
236 ret = vm_insert_pfn(&cvma, address, pfn);
237
238 /*
239 * Somebody beat us to this PTE or prefaulting to
240 * an already populated PTE, or prefaulting error.
241 */
242
243 if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0)))
244 break;
245 else if (unlikely(ret != 0)) {
246 retval =
247 (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
248 goto out_io_unlock;
249 }
250
251 address += PAGE_SIZE;
252 if (unlikely(++page_offset >= page_last))
253 break;
254 }
255out_io_unlock:
256 ttm_mem_io_unlock(man);
257out_unlock:
258 ttm_bo_unreserve(bo);
259 return retval;
260}
261
262static void ttm_bo_vm_open(struct vm_area_struct *vma)
263{
264 struct ttm_buffer_object *bo =
265 (struct ttm_buffer_object *)vma->vm_private_data;
266
267 WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping);
268
269 (void)ttm_bo_reference(bo);
270}
271
272static void ttm_bo_vm_close(struct vm_area_struct *vma)
273{
274 struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data;
275
276 ttm_bo_unref(&bo);
277 vma->vm_private_data = NULL;
278}
279
280static const struct vm_operations_struct ttm_bo_vm_ops = {
281 .fault = ttm_bo_vm_fault,
282 .open = ttm_bo_vm_open,
283 .close = ttm_bo_vm_close
284};
285
286static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev,
287 unsigned long offset,
288 unsigned long pages)
289{
290 struct drm_vma_offset_node *node;
291 struct ttm_buffer_object *bo = NULL;
292
293 drm_vma_offset_lock_lookup(&bdev->vma_manager);
294
295 node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages);
296 if (likely(node)) {
297 bo = container_of(node, struct ttm_buffer_object, vma_node);
298 if (!kref_get_unless_zero(&bo->kref))
299 bo = NULL;
300 }
301
302 drm_vma_offset_unlock_lookup(&bdev->vma_manager);
303
304 if (!bo)
305 pr_err("Could not find buffer object to map\n");
306
307 return bo;
308}
309
310int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
311 struct ttm_bo_device *bdev)
312{
313 struct ttm_bo_driver *driver;
314 struct ttm_buffer_object *bo;
315 int ret;
316
317 bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
318 if (unlikely(!bo))
319 return -EINVAL;
320
321 driver = bo->bdev->driver;
322 if (unlikely(!driver->verify_access)) {
323 ret = -EPERM;
324 goto out_unref;
325 }
326 ret = driver->verify_access(bo, filp);
327 if (unlikely(ret != 0))
328 goto out_unref;
329
330 vma->vm_ops = &ttm_bo_vm_ops;
331
332 /*
333 * Note: We're transferring the bo reference to
334 * vma->vm_private_data here.
335 */
336
337 vma->vm_private_data = bo;
338
339 /*
340 * We'd like to use VM_PFNMAP on shared mappings, where
341 * (vma->vm_flags & VM_SHARED) != 0, for performance reasons,
342 * but for some reason VM_PFNMAP + x86 PAT + write-combine is very
343 * bad for performance. Until that has been sorted out, use
344 * VM_MIXEDMAP on all mappings. See freedesktop.org bug #75719
345 */
346 vma->vm_flags |= VM_MIXEDMAP;
347 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
348 return 0;
349out_unref:
350 ttm_bo_unref(&bo);
351 return ret;
352}
353EXPORT_SYMBOL(ttm_bo_mmap);
354
355int 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);
362 vma->vm_flags |= VM_MIXEDMAP;
363 vma->vm_flags |= VM_IO | VM_DONTEXPAND;
364 return 0;
365}
366EXPORT_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#include <ttm/ttm_module.h>
32#include <ttm/ttm_bo_driver.h>
33#include <ttm/ttm_placement.h>
34#include <linux/mm.h>
35#include <linux/rbtree.h>
36#include <linux/module.h>
37#include <linux/uaccess.h>
38
39#define TTM_BO_VM_NUM_PREFAULT 16
40
41static struct ttm_buffer_object *ttm_bo_vm_lookup_rb(struct ttm_bo_device *bdev,
42 unsigned long page_start,
43 unsigned long num_pages)
44{
45 struct rb_node *cur = bdev->addr_space_rb.rb_node;
46 unsigned long cur_offset;
47 struct ttm_buffer_object *bo;
48 struct ttm_buffer_object *best_bo = NULL;
49
50 while (likely(cur != NULL)) {
51 bo = rb_entry(cur, struct ttm_buffer_object, vm_rb);
52 cur_offset = bo->vm_node->start;
53 if (page_start >= cur_offset) {
54 cur = cur->rb_right;
55 best_bo = bo;
56 if (page_start == cur_offset)
57 break;
58 } else
59 cur = cur->rb_left;
60 }
61
62 if (unlikely(best_bo == NULL))
63 return NULL;
64
65 if (unlikely((best_bo->vm_node->start + best_bo->num_pages) <
66 (page_start + num_pages)))
67 return NULL;
68
69 return best_bo;
70}
71
72static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
73{
74 struct ttm_buffer_object *bo = (struct ttm_buffer_object *)
75 vma->vm_private_data;
76 struct ttm_bo_device *bdev = bo->bdev;
77 unsigned long page_offset;
78 unsigned long page_last;
79 unsigned long pfn;
80 struct ttm_tt *ttm = NULL;
81 struct page *page;
82 int ret;
83 int i;
84 unsigned long address = (unsigned long)vmf->virtual_address;
85 int retval = VM_FAULT_NOPAGE;
86 struct ttm_mem_type_manager *man =
87 &bdev->man[bo->mem.mem_type];
88
89 /*
90 * Work around locking order reversal in fault / nopfn
91 * between mmap_sem and bo_reserve: Perform a trylock operation
92 * for reserve, and if it fails, retry the fault after scheduling.
93 */
94
95 ret = ttm_bo_reserve(bo, true, true, false, 0);
96 if (unlikely(ret != 0)) {
97 if (ret == -EBUSY)
98 set_need_resched();
99 return VM_FAULT_NOPAGE;
100 }
101
102 if (bdev->driver->fault_reserve_notify) {
103 ret = bdev->driver->fault_reserve_notify(bo);
104 switch (ret) {
105 case 0:
106 break;
107 case -EBUSY:
108 set_need_resched();
109 case -ERESTARTSYS:
110 retval = VM_FAULT_NOPAGE;
111 goto out_unlock;
112 default:
113 retval = VM_FAULT_SIGBUS;
114 goto out_unlock;
115 }
116 }
117
118 /*
119 * Wait for buffer data in transit, due to a pipelined
120 * move.
121 */
122
123 spin_lock(&bdev->fence_lock);
124 if (test_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags)) {
125 ret = ttm_bo_wait(bo, false, true, false);
126 spin_unlock(&bdev->fence_lock);
127 if (unlikely(ret != 0)) {
128 retval = (ret != -ERESTARTSYS) ?
129 VM_FAULT_SIGBUS : VM_FAULT_NOPAGE;
130 goto out_unlock;
131 }
132 } else
133 spin_unlock(&bdev->fence_lock);
134
135 ret = ttm_mem_io_lock(man, true);
136 if (unlikely(ret != 0)) {
137 retval = VM_FAULT_NOPAGE;
138 goto out_unlock;
139 }
140 ret = ttm_mem_io_reserve_vm(bo);
141 if (unlikely(ret != 0)) {
142 retval = VM_FAULT_SIGBUS;
143 goto out_io_unlock;
144 }
145
146 page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
147 bo->vm_node->start - vma->vm_pgoff;
148 page_last = ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) +
149 bo->vm_node->start - vma->vm_pgoff;
150
151 if (unlikely(page_offset >= bo->num_pages)) {
152 retval = VM_FAULT_SIGBUS;
153 goto out_io_unlock;
154 }
155
156 /*
157 * Strictly, we're not allowed to modify vma->vm_page_prot here,
158 * since the mmap_sem is only held in read mode. However, we
159 * modify only the caching bits of vma->vm_page_prot and
160 * consider those bits protected by
161 * the bo->mutex, as we should be the only writers.
162 * There shouldn't really be any readers of these bits except
163 * within vm_insert_mixed()? fork?
164 *
165 * TODO: Add a list of vmas to the bo, and change the
166 * vma->vm_page_prot when the object changes caching policy, with
167 * the correct locks held.
168 */
169 if (bo->mem.bus.is_iomem) {
170 vma->vm_page_prot = ttm_io_prot(bo->mem.placement,
171 vma->vm_page_prot);
172 } else {
173 ttm = bo->ttm;
174 vma->vm_page_prot = (bo->mem.placement & TTM_PL_FLAG_CACHED) ?
175 vm_get_page_prot(vma->vm_flags) :
176 ttm_io_prot(bo->mem.placement, vma->vm_page_prot);
177 }
178
179 /*
180 * Speculatively prefault a number of pages. Only error on
181 * first page.
182 */
183
184 for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) {
185 if (bo->mem.bus.is_iomem)
186 pfn = ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) + page_offset;
187 else {
188 page = ttm_tt_get_page(ttm, page_offset);
189 if (unlikely(!page && i == 0)) {
190 retval = VM_FAULT_OOM;
191 goto out_io_unlock;
192 } else if (unlikely(!page)) {
193 break;
194 }
195 pfn = page_to_pfn(page);
196 }
197
198 ret = vm_insert_mixed(vma, address, pfn);
199 /*
200 * Somebody beat us to this PTE or prefaulting to
201 * an already populated PTE, or prefaulting error.
202 */
203
204 if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0)))
205 break;
206 else if (unlikely(ret != 0)) {
207 retval =
208 (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS;
209 goto out_io_unlock;
210 }
211
212 address += PAGE_SIZE;
213 if (unlikely(++page_offset >= page_last))
214 break;
215 }
216out_io_unlock:
217 ttm_mem_io_unlock(man);
218out_unlock:
219 ttm_bo_unreserve(bo);
220 return retval;
221}
222
223static void ttm_bo_vm_open(struct vm_area_struct *vma)
224{
225 struct ttm_buffer_object *bo =
226 (struct ttm_buffer_object *)vma->vm_private_data;
227
228 (void)ttm_bo_reference(bo);
229}
230
231static void ttm_bo_vm_close(struct vm_area_struct *vma)
232{
233 struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data;
234
235 ttm_bo_unref(&bo);
236 vma->vm_private_data = NULL;
237}
238
239static const struct vm_operations_struct ttm_bo_vm_ops = {
240 .fault = ttm_bo_vm_fault,
241 .open = ttm_bo_vm_open,
242 .close = ttm_bo_vm_close
243};
244
245int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
246 struct ttm_bo_device *bdev)
247{
248 struct ttm_bo_driver *driver;
249 struct ttm_buffer_object *bo;
250 int ret;
251
252 read_lock(&bdev->vm_lock);
253 bo = ttm_bo_vm_lookup_rb(bdev, vma->vm_pgoff,
254 (vma->vm_end - vma->vm_start) >> PAGE_SHIFT);
255 if (likely(bo != NULL))
256 ttm_bo_reference(bo);
257 read_unlock(&bdev->vm_lock);
258
259 if (unlikely(bo == NULL)) {
260 printk(KERN_ERR TTM_PFX
261 "Could not find buffer object to map.\n");
262 return -EINVAL;
263 }
264
265 driver = bo->bdev->driver;
266 if (unlikely(!driver->verify_access)) {
267 ret = -EPERM;
268 goto out_unref;
269 }
270 ret = driver->verify_access(bo, filp);
271 if (unlikely(ret != 0))
272 goto out_unref;
273
274 vma->vm_ops = &ttm_bo_vm_ops;
275
276 /*
277 * Note: We're transferring the bo reference to
278 * vma->vm_private_data here.
279 */
280
281 vma->vm_private_data = bo;
282 vma->vm_flags |= VM_RESERVED | VM_IO | VM_MIXEDMAP | VM_DONTEXPAND;
283 return 0;
284out_unref:
285 ttm_bo_unref(&bo);
286 return ret;
287}
288EXPORT_SYMBOL(ttm_bo_mmap);
289
290int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
291{
292 if (vma->vm_pgoff != 0)
293 return -EACCES;
294
295 vma->vm_ops = &ttm_bo_vm_ops;
296 vma->vm_private_data = ttm_bo_reference(bo);
297 vma->vm_flags |= VM_RESERVED | VM_IO | VM_MIXEDMAP | VM_DONTEXPAND;
298 return 0;
299}
300EXPORT_SYMBOL(ttm_fbdev_mmap);
301
302
303ssize_t ttm_bo_io(struct ttm_bo_device *bdev, struct file *filp,
304 const char __user *wbuf, char __user *rbuf, size_t count,
305 loff_t *f_pos, bool write)
306{
307 struct ttm_buffer_object *bo;
308 struct ttm_bo_driver *driver;
309 struct ttm_bo_kmap_obj map;
310 unsigned long dev_offset = (*f_pos >> PAGE_SHIFT);
311 unsigned long kmap_offset;
312 unsigned long kmap_end;
313 unsigned long kmap_num;
314 size_t io_size;
315 unsigned int page_offset;
316 char *virtual;
317 int ret;
318 bool no_wait = false;
319 bool dummy;
320
321 read_lock(&bdev->vm_lock);
322 bo = ttm_bo_vm_lookup_rb(bdev, dev_offset, 1);
323 if (likely(bo != NULL))
324 ttm_bo_reference(bo);
325 read_unlock(&bdev->vm_lock);
326
327 if (unlikely(bo == NULL))
328 return -EFAULT;
329
330 driver = bo->bdev->driver;
331 if (unlikely(!driver->verify_access)) {
332 ret = -EPERM;
333 goto out_unref;
334 }
335
336 ret = driver->verify_access(bo, filp);
337 if (unlikely(ret != 0))
338 goto out_unref;
339
340 kmap_offset = dev_offset - bo->vm_node->start;
341 if (unlikely(kmap_offset >= bo->num_pages)) {
342 ret = -EFBIG;
343 goto out_unref;
344 }
345
346 page_offset = *f_pos & ~PAGE_MASK;
347 io_size = bo->num_pages - kmap_offset;
348 io_size = (io_size << PAGE_SHIFT) - page_offset;
349 if (count < io_size)
350 io_size = count;
351
352 kmap_end = (*f_pos + count - 1) >> PAGE_SHIFT;
353 kmap_num = kmap_end - kmap_offset + 1;
354
355 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
356
357 switch (ret) {
358 case 0:
359 break;
360 case -EBUSY:
361 ret = -EAGAIN;
362 goto out_unref;
363 default:
364 goto out_unref;
365 }
366
367 ret = ttm_bo_kmap(bo, kmap_offset, kmap_num, &map);
368 if (unlikely(ret != 0)) {
369 ttm_bo_unreserve(bo);
370 goto out_unref;
371 }
372
373 virtual = ttm_kmap_obj_virtual(&map, &dummy);
374 virtual += page_offset;
375
376 if (write)
377 ret = copy_from_user(virtual, wbuf, io_size);
378 else
379 ret = copy_to_user(rbuf, virtual, io_size);
380
381 ttm_bo_kunmap(&map);
382 ttm_bo_unreserve(bo);
383 ttm_bo_unref(&bo);
384
385 if (unlikely(ret != 0))
386 return -EFBIG;
387
388 *f_pos += io_size;
389
390 return io_size;
391out_unref:
392 ttm_bo_unref(&bo);
393 return ret;
394}
395
396ssize_t ttm_bo_fbdev_io(struct ttm_buffer_object *bo, const char __user *wbuf,
397 char __user *rbuf, size_t count, loff_t *f_pos,
398 bool write)
399{
400 struct ttm_bo_kmap_obj map;
401 unsigned long kmap_offset;
402 unsigned long kmap_end;
403 unsigned long kmap_num;
404 size_t io_size;
405 unsigned int page_offset;
406 char *virtual;
407 int ret;
408 bool no_wait = false;
409 bool dummy;
410
411 kmap_offset = (*f_pos >> PAGE_SHIFT);
412 if (unlikely(kmap_offset >= bo->num_pages))
413 return -EFBIG;
414
415 page_offset = *f_pos & ~PAGE_MASK;
416 io_size = bo->num_pages - kmap_offset;
417 io_size = (io_size << PAGE_SHIFT) - page_offset;
418 if (count < io_size)
419 io_size = count;
420
421 kmap_end = (*f_pos + count - 1) >> PAGE_SHIFT;
422 kmap_num = kmap_end - kmap_offset + 1;
423
424 ret = ttm_bo_reserve(bo, true, no_wait, false, 0);
425
426 switch (ret) {
427 case 0:
428 break;
429 case -EBUSY:
430 return -EAGAIN;
431 default:
432 return ret;
433 }
434
435 ret = ttm_bo_kmap(bo, kmap_offset, kmap_num, &map);
436 if (unlikely(ret != 0)) {
437 ttm_bo_unreserve(bo);
438 return ret;
439 }
440
441 virtual = ttm_kmap_obj_virtual(&map, &dummy);
442 virtual += page_offset;
443
444 if (write)
445 ret = copy_from_user(virtual, wbuf, io_size);
446 else
447 ret = copy_to_user(rbuf, virtual, io_size);
448
449 ttm_bo_kunmap(&map);
450 ttm_bo_unreserve(bo);
451 ttm_bo_unref(&bo);
452
453 if (unlikely(ret != 0))
454 return ret;
455
456 *f_pos += io_size;
457
458 return io_size;
459}