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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 | 43 | |
0bead7cd | 44 | static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma) |
5cc7f9ab DA |
45 | { |
46 | pgprot_t tmp = vm_get_page_prot(vma->vm_flags); | |
47 | ||
48 | #if defined(__i386__) || defined(__x86_64__) | |
49 | if (boot_cpu_data.x86 > 3 && map_type != _DRM_AGP) { | |
50 | pgprot_val(tmp) |= _PAGE_PCD; | |
51 | pgprot_val(tmp) &= ~_PAGE_PWT; | |
52 | } | |
53 | #elif defined(__powerpc__) | |
54 | pgprot_val(tmp) |= _PAGE_NO_CACHE; | |
55 | if (map_type == _DRM_REGISTERS) | |
56 | pgprot_val(tmp) |= _PAGE_GUARDED; | |
57 | #endif | |
58 | #if defined(__ia64__) | |
59 | if (efi_range_is_wc(vma->vm_start, vma->vm_end - | |
60 | vma->vm_start)) | |
61 | tmp = pgprot_writecombine(tmp); | |
62 | else | |
63 | tmp = pgprot_noncached(tmp); | |
64 | #endif | |
65 | return tmp; | |
66 | } | |
67 | ||
1da177e4 LT |
68 | /** |
69 | * \c nopage method for AGP virtual memory. | |
70 | * | |
71 | * \param vma virtual memory area. | |
72 | * \param address access address. | |
73 | * \return pointer to the page structure. | |
b5e89ed5 | 74 | * |
1da177e4 LT |
75 | * Find the right map and if it's AGP memory find the real physical page to |
76 | * map, get the page, increment the use count and return it. | |
77 | */ | |
78 | #if __OS_HAS_AGP | |
79 | static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 80 | unsigned long address) |
1da177e4 | 81 | { |
84b1fd10 DA |
82 | struct drm_file *priv = vma->vm_file->private_data; |
83 | struct drm_device *dev = priv->head->dev; | |
c60ce623 | 84 | struct drm_map *map = NULL; |
b5e89ed5 | 85 | drm_map_list_t *r_list; |
8d153f71 | 86 | drm_hash_item_t *hash; |
1da177e4 LT |
87 | |
88 | /* | |
b5e89ed5 DA |
89 | * Find the right map |
90 | */ | |
1da177e4 LT |
91 | if (!drm_core_has_AGP(dev)) |
92 | goto vm_nopage_error; | |
93 | ||
b5e89ed5 DA |
94 | if (!dev->agp || !dev->agp->cant_use_aperture) |
95 | goto vm_nopage_error; | |
1da177e4 | 96 | |
1545085a | 97 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) |
8d153f71 TH |
98 | goto vm_nopage_error; |
99 | ||
100 | r_list = drm_hash_entry(hash, drm_map_list_t, hash); | |
101 | map = r_list->map; | |
1da177e4 LT |
102 | |
103 | if (map && map->type == _DRM_AGP) { | |
104 | unsigned long offset = address - vma->vm_start; | |
d1f2b55a | 105 | unsigned long baddr = map->offset + offset; |
1da177e4 LT |
106 | struct drm_agp_mem *agpmem; |
107 | struct page *page; | |
108 | ||
109 | #ifdef __alpha__ | |
110 | /* | |
b5e89ed5 DA |
111 | * Adjust to a bus-relative address |
112 | */ | |
1da177e4 LT |
113 | baddr -= dev->hose->mem_space->start; |
114 | #endif | |
115 | ||
116 | /* | |
b5e89ed5 DA |
117 | * It's AGP memory - find the real physical page to map |
118 | */ | |
bd1b331f | 119 | list_for_each_entry(agpmem, &dev->agp->memory, head) { |
1da177e4 | 120 | if (agpmem->bound <= baddr && |
b5e89ed5 | 121 | agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) |
1da177e4 LT |
122 | break; |
123 | } | |
124 | ||
b5e89ed5 DA |
125 | if (!agpmem) |
126 | goto vm_nopage_error; | |
1da177e4 LT |
127 | |
128 | /* | |
b5e89ed5 DA |
129 | * Get the page, inc the use count, and return it |
130 | */ | |
1da177e4 LT |
131 | offset = (baddr - agpmem->bound) >> PAGE_SHIFT; |
132 | page = virt_to_page(__va(agpmem->memory->memory[offset])); | |
133 | get_page(page); | |
134 | ||
b5e89ed5 DA |
135 | DRM_DEBUG |
136 | ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n", | |
137 | baddr, __va(agpmem->memory->memory[offset]), offset, | |
138 | page_count(page)); | |
1da177e4 LT |
139 | |
140 | return page; | |
b5e89ed5 DA |
141 | } |
142 | vm_nopage_error: | |
143 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
1da177e4 | 144 | } |
b5e89ed5 | 145 | #else /* __OS_HAS_AGP */ |
1da177e4 | 146 | static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma, |
b5e89ed5 | 147 | unsigned long address) |
1da177e4 LT |
148 | { |
149 | return NOPAGE_SIGBUS; | |
150 | } | |
b5e89ed5 | 151 | #endif /* __OS_HAS_AGP */ |
1da177e4 LT |
152 | |
153 | /** | |
154 | * \c nopage method for shared virtual memory. | |
155 | * | |
156 | * \param vma virtual memory area. | |
157 | * \param address access address. | |
158 | * \return pointer to the page structure. | |
b5e89ed5 | 159 | * |
59c51591 | 160 | * Get the mapping, find the real physical page to map, get the page, and |
1da177e4 LT |
161 | * return it. |
162 | */ | |
163 | static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 164 | unsigned long address) |
1da177e4 | 165 | { |
c60ce623 | 166 | struct drm_map *map = (struct drm_map *) vma->vm_private_data; |
b5e89ed5 DA |
167 | unsigned long offset; |
168 | unsigned long i; | |
169 | struct page *page; | |
1da177e4 | 170 | |
b5e89ed5 DA |
171 | if (address > vma->vm_end) |
172 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
173 | if (!map) | |
cd54e7e5 | 174 | return NOPAGE_SIGBUS; /* Nothing allocated */ |
1da177e4 | 175 | |
b5e89ed5 | 176 | offset = address - vma->vm_start; |
1da177e4 | 177 | i = (unsigned long)map->handle + offset; |
38315878 | 178 | page = vmalloc_to_page((void *)i); |
1da177e4 | 179 | if (!page) |
cd54e7e5 | 180 | return NOPAGE_SIGBUS; |
1da177e4 LT |
181 | get_page(page); |
182 | ||
183 | DRM_DEBUG("shm_nopage 0x%lx\n", address); | |
184 | return page; | |
185 | } | |
186 | ||
1da177e4 LT |
187 | /** |
188 | * \c close method for shared virtual memory. | |
b5e89ed5 | 189 | * |
1da177e4 | 190 | * \param vma virtual memory area. |
b5e89ed5 | 191 | * |
1da177e4 LT |
192 | * Deletes map information if we are the last |
193 | * person to close a mapping and it's not in the global maplist. | |
194 | */ | |
c94f7029 | 195 | static void drm_vm_shm_close(struct vm_area_struct *vma) |
1da177e4 | 196 | { |
84b1fd10 DA |
197 | struct drm_file *priv = vma->vm_file->private_data; |
198 | struct drm_device *dev = priv->head->dev; | |
8fc2fdf4 | 199 | struct drm_vma_entry *pt, *temp; |
c60ce623 | 200 | struct drm_map *map; |
1da177e4 | 201 | drm_map_list_t *r_list; |
1da177e4 LT |
202 | int found_maps = 0; |
203 | ||
204 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
205 | vma->vm_start, vma->vm_end - vma->vm_start); | |
206 | atomic_dec(&dev->vma_count); | |
207 | ||
208 | map = vma->vm_private_data; | |
209 | ||
30e2fb18 | 210 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 211 | list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
b5e89ed5 DA |
212 | if (pt->vma->vm_private_data == map) |
213 | found_maps++; | |
1da177e4 | 214 | if (pt->vma == vma) { |
bd1b331f | 215 | list_del(&pt->head); |
1da177e4 | 216 | drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); |
1da177e4 LT |
217 | } |
218 | } | |
bd1b331f | 219 | |
1da177e4 | 220 | /* We were the only map that was found */ |
b5e89ed5 | 221 | if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { |
1da177e4 LT |
222 | /* Check to see if we are in the maplist, if we are not, then |
223 | * we delete this mappings information. | |
224 | */ | |
225 | found_maps = 0; | |
bd1b331f | 226 | list_for_each_entry(r_list, &dev->maplist, head) { |
b5e89ed5 DA |
227 | if (r_list->map == map) |
228 | found_maps++; | |
1da177e4 LT |
229 | } |
230 | ||
b5e89ed5 | 231 | if (!found_maps) { |
9c8da5eb DA |
232 | drm_dma_handle_t dmah; |
233 | ||
1da177e4 LT |
234 | switch (map->type) { |
235 | case _DRM_REGISTERS: | |
236 | case _DRM_FRAME_BUFFER: | |
237 | if (drm_core_has_MTRR(dev) && map->mtrr >= 0) { | |
238 | int retcode; | |
239 | retcode = mtrr_del(map->mtrr, | |
240 | map->offset, | |
241 | map->size); | |
242 | DRM_DEBUG("mtrr_del = %d\n", retcode); | |
243 | } | |
004a7727 | 244 | iounmap(map->handle); |
1da177e4 LT |
245 | break; |
246 | case _DRM_SHM: | |
247 | vfree(map->handle); | |
248 | break; | |
249 | case _DRM_AGP: | |
250 | case _DRM_SCATTER_GATHER: | |
251 | break; | |
2d0f9eaf | 252 | case _DRM_CONSISTENT: |
9c8da5eb DA |
253 | dmah.vaddr = map->handle; |
254 | dmah.busaddr = map->offset; | |
255 | dmah.size = map->size; | |
256 | __drm_pci_free(dev, &dmah); | |
2d0f9eaf | 257 | break; |
1da177e4 LT |
258 | } |
259 | drm_free(map, sizeof(*map), DRM_MEM_MAPS); | |
260 | } | |
261 | } | |
30e2fb18 | 262 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
263 | } |
264 | ||
265 | /** | |
266 | * \c nopage method for DMA virtual memory. | |
267 | * | |
268 | * \param vma virtual memory area. | |
269 | * \param address access address. | |
270 | * \return pointer to the page structure. | |
b5e89ed5 | 271 | * |
1da177e4 LT |
272 | * Determine the page number from the page offset and get it from drm_device_dma::pagelist. |
273 | */ | |
274 | static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 275 | unsigned long address) |
1da177e4 | 276 | { |
84b1fd10 DA |
277 | struct drm_file *priv = vma->vm_file->private_data; |
278 | struct drm_device *dev = priv->head->dev; | |
b5e89ed5 DA |
279 | drm_device_dma_t *dma = dev->dma; |
280 | unsigned long offset; | |
281 | unsigned long page_nr; | |
282 | struct page *page; | |
283 | ||
284 | if (!dma) | |
285 | return NOPAGE_SIGBUS; /* Error */ | |
286 | if (address > vma->vm_end) | |
287 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
288 | if (!dma->pagelist) | |
cd54e7e5 | 289 | return NOPAGE_SIGBUS; /* Nothing allocated */ |
b5e89ed5 DA |
290 | |
291 | offset = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */ | |
292 | page_nr = offset >> PAGE_SHIFT; | |
293 | page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK)))); | |
1da177e4 LT |
294 | |
295 | get_page(page); | |
296 | ||
297 | DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr); | |
298 | return page; | |
299 | } | |
300 | ||
301 | /** | |
302 | * \c nopage method for scatter-gather virtual memory. | |
303 | * | |
304 | * \param vma virtual memory area. | |
305 | * \param address access address. | |
306 | * \return pointer to the page structure. | |
b5e89ed5 | 307 | * |
1da177e4 LT |
308 | * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. |
309 | */ | |
310 | static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 311 | unsigned long address) |
1da177e4 | 312 | { |
c60ce623 | 313 | struct drm_map *map = (struct drm_map *) vma->vm_private_data; |
84b1fd10 DA |
314 | struct drm_file *priv = vma->vm_file->private_data; |
315 | struct drm_device *dev = priv->head->dev; | |
1da177e4 LT |
316 | drm_sg_mem_t *entry = dev->sg; |
317 | unsigned long offset; | |
318 | unsigned long map_offset; | |
319 | unsigned long page_offset; | |
320 | struct page *page; | |
321 | ||
b5e89ed5 DA |
322 | if (!entry) |
323 | return NOPAGE_SIGBUS; /* Error */ | |
324 | if (address > vma->vm_end) | |
325 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
326 | if (!entry->pagelist) | |
cd54e7e5 | 327 | return NOPAGE_SIGBUS; /* Nothing allocated */ |
1da177e4 LT |
328 | |
329 | offset = address - vma->vm_start; | |
d1f2b55a | 330 | map_offset = map->offset - (unsigned long)dev->sg->virtual; |
1da177e4 LT |
331 | page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); |
332 | page = entry->pagelist[page_offset]; | |
333 | get_page(page); | |
334 | ||
335 | return page; | |
336 | } | |
337 | ||
1da177e4 | 338 | static struct page *drm_vm_nopage(struct vm_area_struct *vma, |
b5e89ed5 DA |
339 | unsigned long address, int *type) |
340 | { | |
341 | if (type) | |
342 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
343 | return drm_do_vm_nopage(vma, address); |
344 | } | |
345 | ||
346 | static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
347 | unsigned long address, int *type) |
348 | { | |
349 | if (type) | |
350 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
351 | return drm_do_vm_shm_nopage(vma, address); |
352 | } | |
353 | ||
354 | static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
355 | unsigned long address, int *type) |
356 | { | |
357 | if (type) | |
358 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
359 | return drm_do_vm_dma_nopage(vma, address); |
360 | } | |
361 | ||
362 | static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
363 | unsigned long address, int *type) |
364 | { | |
365 | if (type) | |
366 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
367 | return drm_do_vm_sg_nopage(vma, address); |
368 | } | |
369 | ||
1da177e4 | 370 | /** AGP virtual memory operations */ |
b5e89ed5 | 371 | static struct vm_operations_struct drm_vm_ops = { |
1da177e4 | 372 | .nopage = drm_vm_nopage, |
b5e89ed5 DA |
373 | .open = drm_vm_open, |
374 | .close = drm_vm_close, | |
1da177e4 LT |
375 | }; |
376 | ||
377 | /** Shared virtual memory operations */ | |
b5e89ed5 | 378 | static struct vm_operations_struct drm_vm_shm_ops = { |
1da177e4 | 379 | .nopage = drm_vm_shm_nopage, |
b5e89ed5 DA |
380 | .open = drm_vm_open, |
381 | .close = drm_vm_shm_close, | |
1da177e4 LT |
382 | }; |
383 | ||
384 | /** DMA virtual memory operations */ | |
b5e89ed5 | 385 | static struct vm_operations_struct drm_vm_dma_ops = { |
1da177e4 | 386 | .nopage = drm_vm_dma_nopage, |
b5e89ed5 DA |
387 | .open = drm_vm_open, |
388 | .close = drm_vm_close, | |
1da177e4 LT |
389 | }; |
390 | ||
391 | /** Scatter-gather virtual memory operations */ | |
b5e89ed5 | 392 | static struct vm_operations_struct drm_vm_sg_ops = { |
1da177e4 | 393 | .nopage = drm_vm_sg_nopage, |
b5e89ed5 DA |
394 | .open = drm_vm_open, |
395 | .close = drm_vm_close, | |
1da177e4 LT |
396 | }; |
397 | ||
1da177e4 LT |
398 | /** |
399 | * \c open method for shared virtual memory. | |
b5e89ed5 | 400 | * |
1da177e4 | 401 | * \param vma virtual memory area. |
b5e89ed5 | 402 | * |
1da177e4 LT |
403 | * Create a new drm_vma_entry structure as the \p vma private data entry and |
404 | * add it to drm_device::vmalist. | |
405 | */ | |
d7d8aac7 | 406 | static void drm_vm_open_locked(struct vm_area_struct *vma) |
1da177e4 | 407 | { |
84b1fd10 DA |
408 | struct drm_file *priv = vma->vm_file->private_data; |
409 | struct drm_device *dev = priv->head->dev; | |
8fc2fdf4 | 410 | struct drm_vma_entry *vma_entry; |
1da177e4 LT |
411 | |
412 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
413 | vma->vm_start, vma->vm_end - vma->vm_start); | |
414 | atomic_inc(&dev->vma_count); | |
415 | ||
416 | vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS); | |
417 | if (vma_entry) { | |
b5e89ed5 | 418 | vma_entry->vma = vma; |
b5e89ed5 | 419 | vma_entry->pid = current->pid; |
bd1b331f | 420 | list_add(&vma_entry->head, &dev->vmalist); |
1da177e4 LT |
421 | } |
422 | } | |
423 | ||
d7d8aac7 TH |
424 | static void drm_vm_open(struct vm_area_struct *vma) |
425 | { | |
84b1fd10 DA |
426 | struct drm_file *priv = vma->vm_file->private_data; |
427 | struct drm_device *dev = priv->head->dev; | |
d7d8aac7 TH |
428 | |
429 | mutex_lock(&dev->struct_mutex); | |
430 | drm_vm_open_locked(vma); | |
431 | mutex_unlock(&dev->struct_mutex); | |
432 | } | |
433 | ||
1da177e4 LT |
434 | /** |
435 | * \c close method for all virtual memory types. | |
b5e89ed5 | 436 | * |
1da177e4 | 437 | * \param vma virtual memory area. |
b5e89ed5 | 438 | * |
1da177e4 LT |
439 | * Search the \p vma private data entry in drm_device::vmalist, unlink it, and |
440 | * free it. | |
441 | */ | |
c94f7029 | 442 | static void drm_vm_close(struct vm_area_struct *vma) |
1da177e4 | 443 | { |
84b1fd10 DA |
444 | struct drm_file *priv = vma->vm_file->private_data; |
445 | struct drm_device *dev = priv->head->dev; | |
8fc2fdf4 | 446 | struct drm_vma_entry *pt, *temp; |
1da177e4 LT |
447 | |
448 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
449 | vma->vm_start, vma->vm_end - vma->vm_start); | |
450 | atomic_dec(&dev->vma_count); | |
451 | ||
30e2fb18 | 452 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 453 | list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
1da177e4 | 454 | if (pt->vma == vma) { |
bd1b331f | 455 | list_del(&pt->head); |
1da177e4 LT |
456 | drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); |
457 | break; | |
458 | } | |
459 | } | |
30e2fb18 | 460 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
461 | } |
462 | ||
463 | /** | |
464 | * mmap DMA memory. | |
465 | * | |
466 | * \param filp file pointer. | |
467 | * \param vma virtual memory area. | |
468 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 469 | * |
1da177e4 LT |
470 | * Sets the virtual memory area operations structure to vm_dma_ops, the file |
471 | * pointer, and calls vm_open(). | |
472 | */ | |
c94f7029 | 473 | static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 474 | { |
84b1fd10 DA |
475 | struct drm_file *priv = filp->private_data; |
476 | struct drm_device *dev; | |
1da177e4 | 477 | drm_device_dma_t *dma; |
b5e89ed5 | 478 | unsigned long length = vma->vm_end - vma->vm_start; |
1da177e4 | 479 | |
b5e89ed5 DA |
480 | dev = priv->head->dev; |
481 | dma = dev->dma; | |
1545085a TH |
482 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
483 | vma->vm_start, vma->vm_end, vma->vm_pgoff); | |
1da177e4 | 484 | |
b5e89ed5 | 485 | /* Length must match exact page count */ |
1da177e4 | 486 | if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { |
1da177e4 LT |
487 | return -EINVAL; |
488 | } | |
1da177e4 | 489 | |
3417f33e GS |
490 | if (!capable(CAP_SYS_ADMIN) && |
491 | (dma->flags & _DRM_DMA_USE_PCI_RO)) { | |
492 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
493 | #if defined(__i386__) || defined(__x86_64__) | |
494 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
495 | #else | |
496 | /* Ye gads this is ugly. With more thought | |
497 | we could move this up higher and use | |
498 | `protection_map' instead. */ | |
499 | vma->vm_page_prot = | |
500 | __pgprot(pte_val | |
501 | (pte_wrprotect | |
502 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
503 | #endif | |
504 | } | |
505 | ||
b5e89ed5 | 506 | vma->vm_ops = &drm_vm_dma_ops; |
1da177e4 | 507 | |
b5e89ed5 | 508 | vma->vm_flags |= VM_RESERVED; /* Don't swap */ |
1da177e4 | 509 | |
b5e89ed5 | 510 | vma->vm_file = filp; /* Needed for drm_vm_open() */ |
d7d8aac7 | 511 | drm_vm_open_locked(vma); |
1da177e4 LT |
512 | return 0; |
513 | } | |
514 | ||
c60ce623 | 515 | unsigned long drm_core_get_map_ofs(struct drm_map * map) |
1da177e4 LT |
516 | { |
517 | return map->offset; | |
518 | } | |
b5e89ed5 | 519 | |
1da177e4 LT |
520 | EXPORT_SYMBOL(drm_core_get_map_ofs); |
521 | ||
522 | unsigned long drm_core_get_reg_ofs(struct drm_device *dev) | |
523 | { | |
524 | #ifdef __alpha__ | |
525 | return dev->hose->dense_mem_base - dev->hose->mem_space->start; | |
526 | #else | |
527 | return 0; | |
528 | #endif | |
529 | } | |
b5e89ed5 | 530 | |
1da177e4 LT |
531 | EXPORT_SYMBOL(drm_core_get_reg_ofs); |
532 | ||
533 | /** | |
534 | * mmap DMA memory. | |
535 | * | |
536 | * \param filp file pointer. | |
537 | * \param vma virtual memory area. | |
538 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 539 | * |
1da177e4 LT |
540 | * If the virtual memory area has no offset associated with it then it's a DMA |
541 | * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, | |
542 | * checks that the restricted flag is not set, sets the virtual memory operations | |
543 | * according to the mapping type and remaps the pages. Finally sets the file | |
544 | * pointer and calls vm_open(). | |
545 | */ | |
d7d8aac7 | 546 | static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 547 | { |
84b1fd10 DA |
548 | struct drm_file *priv = filp->private_data; |
549 | struct drm_device *dev = priv->head->dev; | |
c60ce623 | 550 | struct drm_map *map = NULL; |
b5e89ed5 | 551 | unsigned long offset = 0; |
8d153f71 | 552 | drm_hash_item_t *hash; |
1da177e4 | 553 | |
1545085a TH |
554 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
555 | vma->vm_start, vma->vm_end, vma->vm_pgoff); | |
1da177e4 | 556 | |
b5e89ed5 DA |
557 | if (!priv->authenticated) |
558 | return -EACCES; | |
1da177e4 LT |
559 | |
560 | /* We check for "dma". On Apple's UniNorth, it's valid to have | |
561 | * the AGP mapped at physical address 0 | |
562 | * --BenH. | |
563 | */ | |
1545085a | 564 | if (!vma->vm_pgoff |
1da177e4 | 565 | #if __OS_HAS_AGP |
b5e89ed5 DA |
566 | && (!dev->agp |
567 | || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) | |
1da177e4 LT |
568 | #endif |
569 | ) | |
570 | return drm_mmap_dma(filp, vma); | |
571 | ||
1545085a | 572 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { |
8d153f71 TH |
573 | DRM_ERROR("Could not find map\n"); |
574 | return -EINVAL; | |
1da177e4 LT |
575 | } |
576 | ||
8d153f71 | 577 | map = drm_hash_entry(hash, drm_map_list_t, hash)->map; |
b5e89ed5 | 578 | if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) |
1da177e4 LT |
579 | return -EPERM; |
580 | ||
b5e89ed5 | 581 | /* Check for valid size. */ |
54ba2f76 | 582 | if (map->size < vma->vm_end - vma->vm_start) |
b5e89ed5 | 583 | return -EINVAL; |
1da177e4 LT |
584 | |
585 | if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { | |
586 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
587 | #if defined(__i386__) || defined(__x86_64__) | |
588 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
589 | #else | |
b5e89ed5 DA |
590 | /* Ye gads this is ugly. With more thought |
591 | we could move this up higher and use | |
592 | `protection_map' instead. */ | |
593 | vma->vm_page_prot = | |
594 | __pgprot(pte_val | |
595 | (pte_wrprotect | |
596 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
1da177e4 LT |
597 | #endif |
598 | } | |
599 | ||
600 | switch (map->type) { | |
b5e89ed5 DA |
601 | case _DRM_AGP: |
602 | if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) { | |
603 | /* | |
604 | * On some platforms we can't talk to bus dma address from the CPU, so for | |
605 | * memory of type DRM_AGP, we'll deal with sorting out the real physical | |
606 | * pages and mappings in nopage() | |
607 | */ | |
1da177e4 | 608 | #if defined(__powerpc__) |
b5e89ed5 | 609 | pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; |
1da177e4 | 610 | #endif |
b5e89ed5 DA |
611 | vma->vm_ops = &drm_vm_ops; |
612 | break; | |
613 | } | |
614 | /* fall through to _DRM_FRAME_BUFFER... */ | |
1da177e4 LT |
615 | case _DRM_FRAME_BUFFER: |
616 | case _DRM_REGISTERS: | |
1da177e4 | 617 | offset = dev->driver->get_reg_ofs(dev); |
5cc7f9ab DA |
618 | vma->vm_flags |= VM_IO; /* not in core dump */ |
619 | vma->vm_page_prot = drm_io_prot(map->type, vma); | |
1da177e4 | 620 | #ifdef __sparc__ |
14778d90 | 621 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
9e9c1326 | 622 | #endif |
3d77461e | 623 | if (io_remap_pfn_range(vma, vma->vm_start, |
b5e89ed5 DA |
624 | (map->offset + offset) >> PAGE_SHIFT, |
625 | vma->vm_end - vma->vm_start, | |
626 | vma->vm_page_prot)) | |
b5e89ed5 | 627 | return -EAGAIN; |
1da177e4 LT |
628 | DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," |
629 | " offset = 0x%lx\n", | |
630 | map->type, | |
d1f2b55a | 631 | vma->vm_start, vma->vm_end, map->offset + offset); |
1da177e4 LT |
632 | vma->vm_ops = &drm_vm_ops; |
633 | break; | |
2d0f9eaf | 634 | case _DRM_CONSISTENT: |
38315878 HD |
635 | /* Consistent memory is really like shared memory. But |
636 | * it's allocated in a different way, so avoid nopage */ | |
637 | if (remap_pfn_range(vma, vma->vm_start, | |
638 | page_to_pfn(virt_to_page(map->handle)), | |
639 | vma->vm_end - vma->vm_start, vma->vm_page_prot)) | |
640 | return -EAGAIN; | |
641 | /* fall through to _DRM_SHM */ | |
642 | case _DRM_SHM: | |
1da177e4 LT |
643 | vma->vm_ops = &drm_vm_shm_ops; |
644 | vma->vm_private_data = (void *)map; | |
b5e89ed5 DA |
645 | /* Don't let this area swap. Change when |
646 | DRM_KERNEL advisory is supported. */ | |
1da177e4 | 647 | vma->vm_flags |= VM_RESERVED; |
1da177e4 LT |
648 | break; |
649 | case _DRM_SCATTER_GATHER: | |
650 | vma->vm_ops = &drm_vm_sg_ops; | |
651 | vma->vm_private_data = (void *)map; | |
1da177e4 | 652 | vma->vm_flags |= VM_RESERVED; |
b5e89ed5 | 653 | break; |
1da177e4 LT |
654 | default: |
655 | return -EINVAL; /* This should never happen. */ | |
656 | } | |
b5e89ed5 | 657 | vma->vm_flags |= VM_RESERVED; /* Don't swap */ |
1da177e4 | 658 | |
b5e89ed5 | 659 | vma->vm_file = filp; /* Needed for drm_vm_open() */ |
d7d8aac7 | 660 | drm_vm_open_locked(vma); |
1da177e4 LT |
661 | return 0; |
662 | } | |
b5e89ed5 | 663 | |
d7d8aac7 TH |
664 | int drm_mmap(struct file *filp, struct vm_area_struct *vma) |
665 | { | |
84b1fd10 DA |
666 | struct drm_file *priv = filp->private_data; |
667 | struct drm_device *dev = priv->head->dev; | |
d7d8aac7 TH |
668 | int ret; |
669 | ||
670 | mutex_lock(&dev->struct_mutex); | |
671 | ret = drm_mmap_locked(filp, vma); | |
672 | mutex_unlock(&dev->struct_mutex); | |
673 | ||
674 | return ret; | |
675 | } | |
1da177e4 | 676 | EXPORT_SYMBOL(drm_mmap); |