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Commit | Line | Data |
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1da177e4 | 1 | /** |
b5e89ed5 | 2 | * \file drm_vm.c |
1da177e4 | 3 | * Memory mapping for DRM |
b5e89ed5 | 4 | * |
1da177e4 LT |
5 | * \author Rickard E. (Rik) Faith <faith@valinux.com> |
6 | * \author Gareth Hughes <gareth@valinux.com> | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com | |
11 | * | |
12 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. | |
13 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. | |
14 | * All Rights Reserved. | |
15 | * | |
16 | * Permission is hereby granted, free of charge, to any person obtaining a | |
17 | * copy of this software and associated documentation files (the "Software"), | |
18 | * to deal in the Software without restriction, including without limitation | |
19 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
20 | * and/or sell copies of the Software, and to permit persons to whom the | |
21 | * Software is furnished to do so, subject to the following conditions: | |
22 | * | |
23 | * The above copyright notice and this permission notice (including the next | |
24 | * paragraph) shall be included in all copies or substantial portions of the | |
25 | * Software. | |
26 | * | |
27 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
28 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
29 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
30 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
31 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
32 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
33 | * OTHER DEALINGS IN THE SOFTWARE. | |
34 | */ | |
35 | ||
36 | #include "drmP.h" | |
37 | #if defined(__ia64__) | |
38 | #include <linux/efi.h> | |
39 | #endif | |
40 | ||
c94f7029 DA |
41 | static void drm_vm_open(struct vm_area_struct *vma); |
42 | static void drm_vm_close(struct vm_area_struct *vma); | |
1da177e4 LT |
43 | |
44 | /** | |
45 | * \c nopage method for AGP virtual memory. | |
46 | * | |
47 | * \param vma virtual memory area. | |
48 | * \param address access address. | |
49 | * \return pointer to the page structure. | |
b5e89ed5 | 50 | * |
1da177e4 LT |
51 | * Find the right map and if it's AGP memory find the real physical page to |
52 | * map, get the page, increment the use count and return it. | |
53 | */ | |
54 | #if __OS_HAS_AGP | |
55 | static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 56 | unsigned long address) |
1da177e4 | 57 | { |
b5e89ed5 | 58 | drm_file_t *priv = vma->vm_file->private_data; |
1da177e4 | 59 | drm_device_t *dev = priv->head->dev; |
b5e89ed5 DA |
60 | drm_map_t *map = NULL; |
61 | drm_map_list_t *r_list; | |
1da177e4 LT |
62 | struct list_head *list; |
63 | ||
64 | /* | |
b5e89ed5 DA |
65 | * Find the right map |
66 | */ | |
1da177e4 LT |
67 | if (!drm_core_has_AGP(dev)) |
68 | goto vm_nopage_error; | |
69 | ||
b5e89ed5 DA |
70 | if (!dev->agp || !dev->agp->cant_use_aperture) |
71 | goto vm_nopage_error; | |
1da177e4 LT |
72 | |
73 | list_for_each(list, &dev->maplist->head) { | |
74 | r_list = list_entry(list, drm_map_list_t, head); | |
75 | map = r_list->map; | |
b5e89ed5 DA |
76 | if (!map) |
77 | continue; | |
d1f2b55a DA |
78 | if (r_list->user_token == VM_OFFSET(vma)) |
79 | break; | |
1da177e4 LT |
80 | } |
81 | ||
82 | if (map && map->type == _DRM_AGP) { | |
83 | unsigned long offset = address - vma->vm_start; | |
d1f2b55a | 84 | unsigned long baddr = map->offset + offset; |
1da177e4 LT |
85 | struct drm_agp_mem *agpmem; |
86 | struct page *page; | |
87 | ||
88 | #ifdef __alpha__ | |
89 | /* | |
b5e89ed5 DA |
90 | * Adjust to a bus-relative address |
91 | */ | |
1da177e4 LT |
92 | baddr -= dev->hose->mem_space->start; |
93 | #endif | |
94 | ||
95 | /* | |
b5e89ed5 DA |
96 | * It's AGP memory - find the real physical page to map |
97 | */ | |
98 | for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) { | |
1da177e4 | 99 | if (agpmem->bound <= baddr && |
b5e89ed5 | 100 | agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) |
1da177e4 LT |
101 | break; |
102 | } | |
103 | ||
b5e89ed5 DA |
104 | if (!agpmem) |
105 | goto vm_nopage_error; | |
1da177e4 LT |
106 | |
107 | /* | |
b5e89ed5 DA |
108 | * Get the page, inc the use count, and return it |
109 | */ | |
1da177e4 LT |
110 | offset = (baddr - agpmem->bound) >> PAGE_SHIFT; |
111 | page = virt_to_page(__va(agpmem->memory->memory[offset])); | |
112 | get_page(page); | |
113 | ||
b5e89ed5 DA |
114 | DRM_DEBUG |
115 | ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n", | |
116 | baddr, __va(agpmem->memory->memory[offset]), offset, | |
117 | page_count(page)); | |
1da177e4 LT |
118 | |
119 | return page; | |
b5e89ed5 DA |
120 | } |
121 | vm_nopage_error: | |
122 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
1da177e4 | 123 | } |
b5e89ed5 | 124 | #else /* __OS_HAS_AGP */ |
1da177e4 | 125 | static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma, |
b5e89ed5 | 126 | unsigned long address) |
1da177e4 LT |
127 | { |
128 | return NOPAGE_SIGBUS; | |
129 | } | |
b5e89ed5 | 130 | #endif /* __OS_HAS_AGP */ |
1da177e4 LT |
131 | |
132 | /** | |
133 | * \c nopage method for shared virtual memory. | |
134 | * | |
135 | * \param vma virtual memory area. | |
136 | * \param address access address. | |
137 | * \return pointer to the page structure. | |
b5e89ed5 | 138 | * |
1da177e4 LT |
139 | * Get the the mapping, find the real physical page to map, get the page, and |
140 | * return it. | |
141 | */ | |
142 | static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 143 | unsigned long address) |
1da177e4 | 144 | { |
b5e89ed5 DA |
145 | drm_map_t *map = (drm_map_t *) vma->vm_private_data; |
146 | unsigned long offset; | |
147 | unsigned long i; | |
148 | struct page *page; | |
1da177e4 | 149 | |
b5e89ed5 DA |
150 | if (address > vma->vm_end) |
151 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
152 | if (!map) | |
153 | return NOPAGE_OOM; /* Nothing allocated */ | |
1da177e4 | 154 | |
b5e89ed5 | 155 | offset = address - vma->vm_start; |
1da177e4 | 156 | i = (unsigned long)map->handle + offset; |
b5e89ed5 | 157 | page = (map->type == _DRM_CONSISTENT) ? |
5fb4dc9b | 158 | virt_to_page((void *)i) : vmalloc_to_page((void *)i); |
1da177e4 LT |
159 | if (!page) |
160 | return NOPAGE_OOM; | |
161 | get_page(page); | |
162 | ||
163 | DRM_DEBUG("shm_nopage 0x%lx\n", address); | |
164 | return page; | |
165 | } | |
166 | ||
1da177e4 LT |
167 | /** |
168 | * \c close method for shared virtual memory. | |
b5e89ed5 | 169 | * |
1da177e4 | 170 | * \param vma virtual memory area. |
b5e89ed5 | 171 | * |
1da177e4 LT |
172 | * Deletes map information if we are the last |
173 | * person to close a mapping and it's not in the global maplist. | |
174 | */ | |
c94f7029 | 175 | static void drm_vm_shm_close(struct vm_area_struct *vma) |
1da177e4 | 176 | { |
b5e89ed5 DA |
177 | drm_file_t *priv = vma->vm_file->private_data; |
178 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
179 | drm_vma_entry_t *pt, *prev, *next; |
180 | drm_map_t *map; | |
181 | drm_map_list_t *r_list; | |
182 | struct list_head *list; | |
183 | int found_maps = 0; | |
184 | ||
185 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
186 | vma->vm_start, vma->vm_end - vma->vm_start); | |
187 | atomic_dec(&dev->vma_count); | |
188 | ||
189 | map = vma->vm_private_data; | |
190 | ||
30e2fb18 | 191 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
192 | for (pt = dev->vmalist, prev = NULL; pt; pt = next) { |
193 | next = pt->next; | |
b5e89ed5 DA |
194 | if (pt->vma->vm_private_data == map) |
195 | found_maps++; | |
1da177e4 LT |
196 | if (pt->vma == vma) { |
197 | if (prev) { | |
198 | prev->next = pt->next; | |
199 | } else { | |
200 | dev->vmalist = pt->next; | |
201 | } | |
202 | drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); | |
203 | } else { | |
204 | prev = pt; | |
205 | } | |
206 | } | |
207 | /* We were the only map that was found */ | |
b5e89ed5 | 208 | if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { |
1da177e4 LT |
209 | /* Check to see if we are in the maplist, if we are not, then |
210 | * we delete this mappings information. | |
211 | */ | |
212 | found_maps = 0; | |
213 | list = &dev->maplist->head; | |
214 | list_for_each(list, &dev->maplist->head) { | |
215 | r_list = list_entry(list, drm_map_list_t, head); | |
b5e89ed5 DA |
216 | if (r_list->map == map) |
217 | found_maps++; | |
1da177e4 LT |
218 | } |
219 | ||
b5e89ed5 | 220 | if (!found_maps) { |
9c8da5eb DA |
221 | drm_dma_handle_t dmah; |
222 | ||
1da177e4 LT |
223 | switch (map->type) { |
224 | case _DRM_REGISTERS: | |
225 | case _DRM_FRAME_BUFFER: | |
226 | if (drm_core_has_MTRR(dev) && map->mtrr >= 0) { | |
227 | int retcode; | |
228 | retcode = mtrr_del(map->mtrr, | |
229 | map->offset, | |
230 | map->size); | |
231 | DRM_DEBUG("mtrr_del = %d\n", retcode); | |
232 | } | |
233 | drm_ioremapfree(map->handle, map->size, dev); | |
234 | break; | |
235 | case _DRM_SHM: | |
236 | vfree(map->handle); | |
237 | break; | |
238 | case _DRM_AGP: | |
239 | case _DRM_SCATTER_GATHER: | |
240 | break; | |
2d0f9eaf | 241 | case _DRM_CONSISTENT: |
9c8da5eb DA |
242 | dmah.vaddr = map->handle; |
243 | dmah.busaddr = map->offset; | |
244 | dmah.size = map->size; | |
245 | __drm_pci_free(dev, &dmah); | |
2d0f9eaf | 246 | break; |
1da177e4 LT |
247 | } |
248 | drm_free(map, sizeof(*map), DRM_MEM_MAPS); | |
249 | } | |
250 | } | |
30e2fb18 | 251 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
252 | } |
253 | ||
254 | /** | |
255 | * \c nopage method for DMA virtual memory. | |
256 | * | |
257 | * \param vma virtual memory area. | |
258 | * \param address access address. | |
259 | * \return pointer to the page structure. | |
b5e89ed5 | 260 | * |
1da177e4 LT |
261 | * Determine the page number from the page offset and get it from drm_device_dma::pagelist. |
262 | */ | |
263 | static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 264 | unsigned long address) |
1da177e4 | 265 | { |
b5e89ed5 DA |
266 | drm_file_t *priv = vma->vm_file->private_data; |
267 | drm_device_t *dev = priv->head->dev; | |
268 | drm_device_dma_t *dma = dev->dma; | |
269 | unsigned long offset; | |
270 | unsigned long page_nr; | |
271 | struct page *page; | |
272 | ||
273 | if (!dma) | |
274 | return NOPAGE_SIGBUS; /* Error */ | |
275 | if (address > vma->vm_end) | |
276 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
277 | if (!dma->pagelist) | |
278 | return NOPAGE_OOM; /* Nothing allocated */ | |
279 | ||
280 | offset = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */ | |
281 | page_nr = offset >> PAGE_SHIFT; | |
282 | page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK)))); | |
1da177e4 LT |
283 | |
284 | get_page(page); | |
285 | ||
286 | DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr); | |
287 | return page; | |
288 | } | |
289 | ||
290 | /** | |
291 | * \c nopage method for scatter-gather virtual memory. | |
292 | * | |
293 | * \param vma virtual memory area. | |
294 | * \param address access address. | |
295 | * \return pointer to the page structure. | |
b5e89ed5 | 296 | * |
1da177e4 LT |
297 | * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. |
298 | */ | |
299 | static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 300 | unsigned long address) |
1da177e4 | 301 | { |
b5e89ed5 | 302 | drm_map_t *map = (drm_map_t *) vma->vm_private_data; |
1da177e4 LT |
303 | drm_file_t *priv = vma->vm_file->private_data; |
304 | drm_device_t *dev = priv->head->dev; | |
305 | drm_sg_mem_t *entry = dev->sg; | |
306 | unsigned long offset; | |
307 | unsigned long map_offset; | |
308 | unsigned long page_offset; | |
309 | struct page *page; | |
310 | ||
b5e89ed5 DA |
311 | if (!entry) |
312 | return NOPAGE_SIGBUS; /* Error */ | |
313 | if (address > vma->vm_end) | |
314 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
315 | if (!entry->pagelist) | |
316 | return NOPAGE_OOM; /* Nothing allocated */ | |
1da177e4 LT |
317 | |
318 | offset = address - vma->vm_start; | |
d1f2b55a | 319 | map_offset = map->offset - (unsigned long)dev->sg->virtual; |
1da177e4 LT |
320 | page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); |
321 | page = entry->pagelist[page_offset]; | |
322 | get_page(page); | |
323 | ||
324 | return page; | |
325 | } | |
326 | ||
1da177e4 | 327 | static struct page *drm_vm_nopage(struct vm_area_struct *vma, |
b5e89ed5 DA |
328 | unsigned long address, int *type) |
329 | { | |
330 | if (type) | |
331 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
332 | return drm_do_vm_nopage(vma, address); |
333 | } | |
334 | ||
335 | static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
336 | unsigned long address, int *type) |
337 | { | |
338 | if (type) | |
339 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
340 | return drm_do_vm_shm_nopage(vma, address); |
341 | } | |
342 | ||
343 | static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
344 | unsigned long address, int *type) |
345 | { | |
346 | if (type) | |
347 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
348 | return drm_do_vm_dma_nopage(vma, address); |
349 | } | |
350 | ||
351 | static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
352 | unsigned long address, int *type) |
353 | { | |
354 | if (type) | |
355 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
356 | return drm_do_vm_sg_nopage(vma, address); |
357 | } | |
358 | ||
1da177e4 | 359 | /** AGP virtual memory operations */ |
b5e89ed5 | 360 | static struct vm_operations_struct drm_vm_ops = { |
1da177e4 | 361 | .nopage = drm_vm_nopage, |
b5e89ed5 DA |
362 | .open = drm_vm_open, |
363 | .close = drm_vm_close, | |
1da177e4 LT |
364 | }; |
365 | ||
366 | /** Shared virtual memory operations */ | |
b5e89ed5 | 367 | static struct vm_operations_struct drm_vm_shm_ops = { |
1da177e4 | 368 | .nopage = drm_vm_shm_nopage, |
b5e89ed5 DA |
369 | .open = drm_vm_open, |
370 | .close = drm_vm_shm_close, | |
1da177e4 LT |
371 | }; |
372 | ||
373 | /** DMA virtual memory operations */ | |
b5e89ed5 | 374 | static struct vm_operations_struct drm_vm_dma_ops = { |
1da177e4 | 375 | .nopage = drm_vm_dma_nopage, |
b5e89ed5 DA |
376 | .open = drm_vm_open, |
377 | .close = drm_vm_close, | |
1da177e4 LT |
378 | }; |
379 | ||
380 | /** Scatter-gather virtual memory operations */ | |
b5e89ed5 | 381 | static struct vm_operations_struct drm_vm_sg_ops = { |
1da177e4 | 382 | .nopage = drm_vm_sg_nopage, |
b5e89ed5 DA |
383 | .open = drm_vm_open, |
384 | .close = drm_vm_close, | |
1da177e4 LT |
385 | }; |
386 | ||
1da177e4 LT |
387 | /** |
388 | * \c open method for shared virtual memory. | |
b5e89ed5 | 389 | * |
1da177e4 | 390 | * \param vma virtual memory area. |
b5e89ed5 | 391 | * |
1da177e4 LT |
392 | * Create a new drm_vma_entry structure as the \p vma private data entry and |
393 | * add it to drm_device::vmalist. | |
394 | */ | |
c94f7029 | 395 | static void drm_vm_open(struct vm_area_struct *vma) |
1da177e4 | 396 | { |
b5e89ed5 DA |
397 | drm_file_t *priv = vma->vm_file->private_data; |
398 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
399 | drm_vma_entry_t *vma_entry; |
400 | ||
401 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
402 | vma->vm_start, vma->vm_end - vma->vm_start); | |
403 | atomic_inc(&dev->vma_count); | |
404 | ||
405 | vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS); | |
406 | if (vma_entry) { | |
30e2fb18 | 407 | mutex_lock(&dev->struct_mutex); |
b5e89ed5 | 408 | vma_entry->vma = vma; |
1da177e4 | 409 | vma_entry->next = dev->vmalist; |
b5e89ed5 DA |
410 | vma_entry->pid = current->pid; |
411 | dev->vmalist = vma_entry; | |
30e2fb18 | 412 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
413 | } |
414 | } | |
415 | ||
416 | /** | |
417 | * \c close method for all virtual memory types. | |
b5e89ed5 | 418 | * |
1da177e4 | 419 | * \param vma virtual memory area. |
b5e89ed5 | 420 | * |
1da177e4 LT |
421 | * Search the \p vma private data entry in drm_device::vmalist, unlink it, and |
422 | * free it. | |
423 | */ | |
c94f7029 | 424 | static void drm_vm_close(struct vm_area_struct *vma) |
1da177e4 | 425 | { |
b5e89ed5 DA |
426 | drm_file_t *priv = vma->vm_file->private_data; |
427 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
428 | drm_vma_entry_t *pt, *prev; |
429 | ||
430 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
431 | vma->vm_start, vma->vm_end - vma->vm_start); | |
432 | atomic_dec(&dev->vma_count); | |
433 | ||
30e2fb18 | 434 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
435 | for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) { |
436 | if (pt->vma == vma) { | |
437 | if (prev) { | |
438 | prev->next = pt->next; | |
439 | } else { | |
440 | dev->vmalist = pt->next; | |
441 | } | |
442 | drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); | |
443 | break; | |
444 | } | |
445 | } | |
30e2fb18 | 446 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
447 | } |
448 | ||
449 | /** | |
450 | * mmap DMA memory. | |
451 | * | |
452 | * \param filp file pointer. | |
453 | * \param vma virtual memory area. | |
454 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 455 | * |
1da177e4 LT |
456 | * Sets the virtual memory area operations structure to vm_dma_ops, the file |
457 | * pointer, and calls vm_open(). | |
458 | */ | |
c94f7029 | 459 | static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 460 | { |
b5e89ed5 DA |
461 | drm_file_t *priv = filp->private_data; |
462 | drm_device_t *dev; | |
1da177e4 | 463 | drm_device_dma_t *dma; |
b5e89ed5 | 464 | unsigned long length = vma->vm_end - vma->vm_start; |
1da177e4 LT |
465 | |
466 | lock_kernel(); | |
b5e89ed5 DA |
467 | dev = priv->head->dev; |
468 | dma = dev->dma; | |
1da177e4 LT |
469 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n", |
470 | vma->vm_start, vma->vm_end, VM_OFFSET(vma)); | |
471 | ||
b5e89ed5 | 472 | /* Length must match exact page count */ |
1da177e4 LT |
473 | if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { |
474 | unlock_kernel(); | |
475 | return -EINVAL; | |
476 | } | |
477 | unlock_kernel(); | |
478 | ||
b5e89ed5 | 479 | vma->vm_ops = &drm_vm_dma_ops; |
1da177e4 | 480 | |
b5e89ed5 | 481 | vma->vm_flags |= VM_RESERVED; /* Don't swap */ |
1da177e4 | 482 | |
b5e89ed5 | 483 | vma->vm_file = filp; /* Needed for drm_vm_open() */ |
1da177e4 LT |
484 | drm_vm_open(vma); |
485 | return 0; | |
486 | } | |
487 | ||
b5e89ed5 | 488 | unsigned long drm_core_get_map_ofs(drm_map_t * map) |
1da177e4 LT |
489 | { |
490 | return map->offset; | |
491 | } | |
b5e89ed5 | 492 | |
1da177e4 LT |
493 | EXPORT_SYMBOL(drm_core_get_map_ofs); |
494 | ||
495 | unsigned long drm_core_get_reg_ofs(struct drm_device *dev) | |
496 | { | |
497 | #ifdef __alpha__ | |
498 | return dev->hose->dense_mem_base - dev->hose->mem_space->start; | |
499 | #else | |
500 | return 0; | |
501 | #endif | |
502 | } | |
b5e89ed5 | 503 | |
1da177e4 LT |
504 | EXPORT_SYMBOL(drm_core_get_reg_ofs); |
505 | ||
506 | /** | |
507 | * mmap DMA memory. | |
508 | * | |
509 | * \param filp file pointer. | |
510 | * \param vma virtual memory area. | |
511 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 512 | * |
1da177e4 LT |
513 | * If the virtual memory area has no offset associated with it then it's a DMA |
514 | * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, | |
515 | * checks that the restricted flag is not set, sets the virtual memory operations | |
516 | * according to the mapping type and remaps the pages. Finally sets the file | |
517 | * pointer and calls vm_open(). | |
518 | */ | |
519 | int drm_mmap(struct file *filp, struct vm_area_struct *vma) | |
520 | { | |
b5e89ed5 DA |
521 | drm_file_t *priv = filp->private_data; |
522 | drm_device_t *dev = priv->head->dev; | |
523 | drm_map_t *map = NULL; | |
524 | drm_map_list_t *r_list; | |
525 | unsigned long offset = 0; | |
1da177e4 LT |
526 | struct list_head *list; |
527 | ||
528 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n", | |
529 | vma->vm_start, vma->vm_end, VM_OFFSET(vma)); | |
530 | ||
b5e89ed5 DA |
531 | if (!priv->authenticated) |
532 | return -EACCES; | |
1da177e4 LT |
533 | |
534 | /* We check for "dma". On Apple's UniNorth, it's valid to have | |
535 | * the AGP mapped at physical address 0 | |
536 | * --BenH. | |
537 | */ | |
538 | if (!VM_OFFSET(vma) | |
539 | #if __OS_HAS_AGP | |
b5e89ed5 DA |
540 | && (!dev->agp |
541 | || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) | |
1da177e4 LT |
542 | #endif |
543 | ) | |
544 | return drm_mmap_dma(filp, vma); | |
545 | ||
b5e89ed5 DA |
546 | /* A sequential search of a linked list is |
547 | fine here because: 1) there will only be | |
548 | about 5-10 entries in the list and, 2) a | |
549 | DRI client only has to do this mapping | |
550 | once, so it doesn't have to be optimized | |
551 | for performance, even if the list was a | |
552 | bit longer. */ | |
1da177e4 | 553 | list_for_each(list, &dev->maplist->head) { |
1da177e4 LT |
554 | |
555 | r_list = list_entry(list, drm_map_list_t, head); | |
556 | map = r_list->map; | |
b5e89ed5 DA |
557 | if (!map) |
558 | continue; | |
d1f2b55a DA |
559 | if (r_list->user_token == VM_OFFSET(vma)) |
560 | break; | |
1da177e4 LT |
561 | } |
562 | ||
b5e89ed5 | 563 | if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) |
1da177e4 LT |
564 | return -EPERM; |
565 | ||
b5e89ed5 DA |
566 | /* Check for valid size. */ |
567 | if (map->size != vma->vm_end - vma->vm_start) | |
568 | return -EINVAL; | |
1da177e4 LT |
569 | |
570 | if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { | |
571 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
572 | #if defined(__i386__) || defined(__x86_64__) | |
573 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
574 | #else | |
b5e89ed5 DA |
575 | /* Ye gads this is ugly. With more thought |
576 | we could move this up higher and use | |
577 | `protection_map' instead. */ | |
578 | vma->vm_page_prot = | |
579 | __pgprot(pte_val | |
580 | (pte_wrprotect | |
581 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
1da177e4 LT |
582 | #endif |
583 | } | |
584 | ||
585 | switch (map->type) { | |
b5e89ed5 DA |
586 | case _DRM_AGP: |
587 | if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) { | |
588 | /* | |
589 | * On some platforms we can't talk to bus dma address from the CPU, so for | |
590 | * memory of type DRM_AGP, we'll deal with sorting out the real physical | |
591 | * pages and mappings in nopage() | |
592 | */ | |
1da177e4 | 593 | #if defined(__powerpc__) |
b5e89ed5 | 594 | pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; |
1da177e4 | 595 | #endif |
b5e89ed5 DA |
596 | vma->vm_ops = &drm_vm_ops; |
597 | break; | |
598 | } | |
599 | /* fall through to _DRM_FRAME_BUFFER... */ | |
1da177e4 LT |
600 | case _DRM_FRAME_BUFFER: |
601 | case _DRM_REGISTERS: | |
1da177e4 | 602 | #if defined(__i386__) || defined(__x86_64__) |
88f399cd DA |
603 | if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) { |
604 | pgprot_val(vma->vm_page_prot) |= _PAGE_PCD; | |
605 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT; | |
606 | } | |
1da177e4 | 607 | #elif defined(__powerpc__) |
88f399cd DA |
608 | pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; |
609 | if (map->type == _DRM_REGISTERS) | |
610 | pgprot_val(vma->vm_page_prot) |= _PAGE_GUARDED; | |
1da177e4 | 611 | #endif |
88f399cd | 612 | vma->vm_flags |= VM_IO; /* not in core dump */ |
1da177e4 | 613 | #if defined(__ia64__) |
b5e89ed5 | 614 | if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start)) |
1da177e4 | 615 | vma->vm_page_prot = |
b5e89ed5 | 616 | pgprot_writecombine(vma->vm_page_prot); |
1da177e4 | 617 | else |
b5e89ed5 | 618 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
1da177e4 LT |
619 | #endif |
620 | offset = dev->driver->get_reg_ofs(dev); | |
621 | #ifdef __sparc__ | |
14778d90 | 622 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
1da177e4 | 623 | if (io_remap_pfn_range(DRM_RPR_ARG(vma) vma->vm_start, |
b5e89ed5 DA |
624 | (map->offset + offset) >> PAGE_SHIFT, |
625 | vma->vm_end - vma->vm_start, | |
626 | vma->vm_page_prot)) | |
1da177e4 LT |
627 | #else |
628 | if (io_remap_pfn_range(vma, vma->vm_start, | |
b5e89ed5 DA |
629 | (map->offset + offset) >> PAGE_SHIFT, |
630 | vma->vm_end - vma->vm_start, | |
631 | vma->vm_page_prot)) | |
1da177e4 | 632 | #endif |
b5e89ed5 | 633 | return -EAGAIN; |
1da177e4 LT |
634 | DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," |
635 | " offset = 0x%lx\n", | |
636 | map->type, | |
d1f2b55a | 637 | vma->vm_start, vma->vm_end, map->offset + offset); |
1da177e4 LT |
638 | vma->vm_ops = &drm_vm_ops; |
639 | break; | |
640 | case _DRM_SHM: | |
2d0f9eaf DA |
641 | case _DRM_CONSISTENT: |
642 | /* Consistent memory is really like shared memory. It's only | |
643 | * allocate in a different way */ | |
1da177e4 LT |
644 | vma->vm_ops = &drm_vm_shm_ops; |
645 | vma->vm_private_data = (void *)map; | |
b5e89ed5 DA |
646 | /* Don't let this area swap. Change when |
647 | DRM_KERNEL advisory is supported. */ | |
1da177e4 | 648 | vma->vm_flags |= VM_RESERVED; |
1da177e4 LT |
649 | break; |
650 | case _DRM_SCATTER_GATHER: | |
651 | vma->vm_ops = &drm_vm_sg_ops; | |
652 | vma->vm_private_data = (void *)map; | |
1da177e4 | 653 | vma->vm_flags |= VM_RESERVED; |
b5e89ed5 | 654 | break; |
1da177e4 LT |
655 | default: |
656 | return -EINVAL; /* This should never happen. */ | |
657 | } | |
b5e89ed5 | 658 | vma->vm_flags |= VM_RESERVED; /* Don't swap */ |
1da177e4 | 659 | |
b5e89ed5 | 660 | vma->vm_file = filp; /* Needed for drm_vm_open() */ |
1da177e4 LT |
661 | drm_vm_open(vma); |
662 | return 0; | |
663 | } | |
b5e89ed5 | 664 | |
1da177e4 | 665 | EXPORT_SYMBOL(drm_mmap); |