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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 | { |
b5e89ed5 | 82 | drm_file_t *priv = vma->vm_file->private_data; |
1da177e4 | 83 | drm_device_t *dev = priv->head->dev; |
b5e89ed5 DA |
84 | drm_map_t *map = NULL; |
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 | */ | |
119 | for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) { | |
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 | { |
b5e89ed5 DA |
166 | drm_map_t *map = (drm_map_t *) vma->vm_private_data; |
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 | { |
b5e89ed5 DA |
197 | drm_file_t *priv = vma->vm_file->private_data; |
198 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
199 | drm_vma_entry_t *pt, *prev, *next; |
200 | drm_map_t *map; | |
201 | drm_map_list_t *r_list; | |
202 | struct list_head *list; | |
203 | int found_maps = 0; | |
204 | ||
205 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
206 | vma->vm_start, vma->vm_end - vma->vm_start); | |
207 | atomic_dec(&dev->vma_count); | |
208 | ||
209 | map = vma->vm_private_data; | |
210 | ||
30e2fb18 | 211 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
212 | for (pt = dev->vmalist, prev = NULL; pt; pt = next) { |
213 | next = pt->next; | |
b5e89ed5 DA |
214 | if (pt->vma->vm_private_data == map) |
215 | found_maps++; | |
1da177e4 LT |
216 | if (pt->vma == vma) { |
217 | if (prev) { | |
218 | prev->next = pt->next; | |
219 | } else { | |
220 | dev->vmalist = pt->next; | |
221 | } | |
222 | drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); | |
223 | } else { | |
224 | prev = pt; | |
225 | } | |
226 | } | |
227 | /* We were the only map that was found */ | |
b5e89ed5 | 228 | if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { |
1da177e4 LT |
229 | /* Check to see if we are in the maplist, if we are not, then |
230 | * we delete this mappings information. | |
231 | */ | |
232 | found_maps = 0; | |
233 | list = &dev->maplist->head; | |
234 | list_for_each(list, &dev->maplist->head) { | |
235 | r_list = list_entry(list, drm_map_list_t, head); | |
b5e89ed5 DA |
236 | if (r_list->map == map) |
237 | found_maps++; | |
1da177e4 LT |
238 | } |
239 | ||
b5e89ed5 | 240 | if (!found_maps) { |
9c8da5eb DA |
241 | drm_dma_handle_t dmah; |
242 | ||
1da177e4 LT |
243 | switch (map->type) { |
244 | case _DRM_REGISTERS: | |
245 | case _DRM_FRAME_BUFFER: | |
246 | if (drm_core_has_MTRR(dev) && map->mtrr >= 0) { | |
247 | int retcode; | |
248 | retcode = mtrr_del(map->mtrr, | |
249 | map->offset, | |
250 | map->size); | |
251 | DRM_DEBUG("mtrr_del = %d\n", retcode); | |
252 | } | |
004a7727 | 253 | iounmap(map->handle); |
1da177e4 LT |
254 | break; |
255 | case _DRM_SHM: | |
256 | vfree(map->handle); | |
257 | break; | |
258 | case _DRM_AGP: | |
259 | case _DRM_SCATTER_GATHER: | |
260 | break; | |
2d0f9eaf | 261 | case _DRM_CONSISTENT: |
9c8da5eb DA |
262 | dmah.vaddr = map->handle; |
263 | dmah.busaddr = map->offset; | |
264 | dmah.size = map->size; | |
265 | __drm_pci_free(dev, &dmah); | |
2d0f9eaf | 266 | break; |
1da177e4 LT |
267 | } |
268 | drm_free(map, sizeof(*map), DRM_MEM_MAPS); | |
269 | } | |
270 | } | |
30e2fb18 | 271 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
272 | } |
273 | ||
274 | /** | |
275 | * \c nopage method for DMA virtual memory. | |
276 | * | |
277 | * \param vma virtual memory area. | |
278 | * \param address access address. | |
279 | * \return pointer to the page structure. | |
b5e89ed5 | 280 | * |
1da177e4 LT |
281 | * Determine the page number from the page offset and get it from drm_device_dma::pagelist. |
282 | */ | |
283 | static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 284 | unsigned long address) |
1da177e4 | 285 | { |
b5e89ed5 DA |
286 | drm_file_t *priv = vma->vm_file->private_data; |
287 | drm_device_t *dev = priv->head->dev; | |
288 | drm_device_dma_t *dma = dev->dma; | |
289 | unsigned long offset; | |
290 | unsigned long page_nr; | |
291 | struct page *page; | |
292 | ||
293 | if (!dma) | |
294 | return NOPAGE_SIGBUS; /* Error */ | |
295 | if (address > vma->vm_end) | |
296 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
297 | if (!dma->pagelist) | |
cd54e7e5 | 298 | return NOPAGE_SIGBUS; /* Nothing allocated */ |
b5e89ed5 DA |
299 | |
300 | offset = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */ | |
301 | page_nr = offset >> PAGE_SHIFT; | |
302 | page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK)))); | |
1da177e4 LT |
303 | |
304 | get_page(page); | |
305 | ||
306 | DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr); | |
307 | return page; | |
308 | } | |
309 | ||
310 | /** | |
311 | * \c nopage method for scatter-gather virtual memory. | |
312 | * | |
313 | * \param vma virtual memory area. | |
314 | * \param address access address. | |
315 | * \return pointer to the page structure. | |
b5e89ed5 | 316 | * |
1da177e4 LT |
317 | * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. |
318 | */ | |
319 | static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 320 | unsigned long address) |
1da177e4 | 321 | { |
b5e89ed5 | 322 | drm_map_t *map = (drm_map_t *) vma->vm_private_data; |
1da177e4 LT |
323 | drm_file_t *priv = vma->vm_file->private_data; |
324 | drm_device_t *dev = priv->head->dev; | |
325 | drm_sg_mem_t *entry = dev->sg; | |
326 | unsigned long offset; | |
327 | unsigned long map_offset; | |
328 | unsigned long page_offset; | |
329 | struct page *page; | |
330 | ||
b5e89ed5 DA |
331 | if (!entry) |
332 | return NOPAGE_SIGBUS; /* Error */ | |
333 | if (address > vma->vm_end) | |
334 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
335 | if (!entry->pagelist) | |
cd54e7e5 | 336 | return NOPAGE_SIGBUS; /* Nothing allocated */ |
1da177e4 LT |
337 | |
338 | offset = address - vma->vm_start; | |
d1f2b55a | 339 | map_offset = map->offset - (unsigned long)dev->sg->virtual; |
1da177e4 LT |
340 | page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); |
341 | page = entry->pagelist[page_offset]; | |
342 | get_page(page); | |
343 | ||
344 | return page; | |
345 | } | |
346 | ||
1da177e4 | 347 | static struct page *drm_vm_nopage(struct vm_area_struct *vma, |
b5e89ed5 DA |
348 | unsigned long address, int *type) |
349 | { | |
350 | if (type) | |
351 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
352 | return drm_do_vm_nopage(vma, address); |
353 | } | |
354 | ||
355 | static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
356 | unsigned long address, int *type) |
357 | { | |
358 | if (type) | |
359 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
360 | return drm_do_vm_shm_nopage(vma, address); |
361 | } | |
362 | ||
363 | static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
364 | unsigned long address, int *type) |
365 | { | |
366 | if (type) | |
367 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
368 | return drm_do_vm_dma_nopage(vma, address); |
369 | } | |
370 | ||
371 | static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
372 | unsigned long address, int *type) |
373 | { | |
374 | if (type) | |
375 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
376 | return drm_do_vm_sg_nopage(vma, address); |
377 | } | |
378 | ||
1da177e4 | 379 | /** AGP virtual memory operations */ |
b5e89ed5 | 380 | static struct vm_operations_struct drm_vm_ops = { |
1da177e4 | 381 | .nopage = drm_vm_nopage, |
b5e89ed5 DA |
382 | .open = drm_vm_open, |
383 | .close = drm_vm_close, | |
1da177e4 LT |
384 | }; |
385 | ||
386 | /** Shared virtual memory operations */ | |
b5e89ed5 | 387 | static struct vm_operations_struct drm_vm_shm_ops = { |
1da177e4 | 388 | .nopage = drm_vm_shm_nopage, |
b5e89ed5 DA |
389 | .open = drm_vm_open, |
390 | .close = drm_vm_shm_close, | |
1da177e4 LT |
391 | }; |
392 | ||
393 | /** DMA virtual memory operations */ | |
b5e89ed5 | 394 | static struct vm_operations_struct drm_vm_dma_ops = { |
1da177e4 | 395 | .nopage = drm_vm_dma_nopage, |
b5e89ed5 DA |
396 | .open = drm_vm_open, |
397 | .close = drm_vm_close, | |
1da177e4 LT |
398 | }; |
399 | ||
400 | /** Scatter-gather virtual memory operations */ | |
b5e89ed5 | 401 | static struct vm_operations_struct drm_vm_sg_ops = { |
1da177e4 | 402 | .nopage = drm_vm_sg_nopage, |
b5e89ed5 DA |
403 | .open = drm_vm_open, |
404 | .close = drm_vm_close, | |
1da177e4 LT |
405 | }; |
406 | ||
1da177e4 LT |
407 | /** |
408 | * \c open method for shared virtual memory. | |
b5e89ed5 | 409 | * |
1da177e4 | 410 | * \param vma virtual memory area. |
b5e89ed5 | 411 | * |
1da177e4 LT |
412 | * Create a new drm_vma_entry structure as the \p vma private data entry and |
413 | * add it to drm_device::vmalist. | |
414 | */ | |
d7d8aac7 | 415 | static void drm_vm_open_locked(struct vm_area_struct *vma) |
1da177e4 | 416 | { |
b5e89ed5 DA |
417 | drm_file_t *priv = vma->vm_file->private_data; |
418 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
419 | drm_vma_entry_t *vma_entry; |
420 | ||
421 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
422 | vma->vm_start, vma->vm_end - vma->vm_start); | |
423 | atomic_inc(&dev->vma_count); | |
424 | ||
425 | vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS); | |
426 | if (vma_entry) { | |
b5e89ed5 | 427 | vma_entry->vma = vma; |
1da177e4 | 428 | vma_entry->next = dev->vmalist; |
b5e89ed5 DA |
429 | vma_entry->pid = current->pid; |
430 | dev->vmalist = vma_entry; | |
1da177e4 LT |
431 | } |
432 | } | |
433 | ||
d7d8aac7 TH |
434 | static void drm_vm_open(struct vm_area_struct *vma) |
435 | { | |
436 | drm_file_t *priv = vma->vm_file->private_data; | |
437 | drm_device_t *dev = priv->head->dev; | |
438 | ||
439 | mutex_lock(&dev->struct_mutex); | |
440 | drm_vm_open_locked(vma); | |
441 | mutex_unlock(&dev->struct_mutex); | |
442 | } | |
443 | ||
1da177e4 LT |
444 | /** |
445 | * \c close method for all virtual memory types. | |
b5e89ed5 | 446 | * |
1da177e4 | 447 | * \param vma virtual memory area. |
b5e89ed5 | 448 | * |
1da177e4 LT |
449 | * Search the \p vma private data entry in drm_device::vmalist, unlink it, and |
450 | * free it. | |
451 | */ | |
c94f7029 | 452 | static void drm_vm_close(struct vm_area_struct *vma) |
1da177e4 | 453 | { |
b5e89ed5 DA |
454 | drm_file_t *priv = vma->vm_file->private_data; |
455 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
456 | drm_vma_entry_t *pt, *prev; |
457 | ||
458 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
459 | vma->vm_start, vma->vm_end - vma->vm_start); | |
460 | atomic_dec(&dev->vma_count); | |
461 | ||
30e2fb18 | 462 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
463 | for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) { |
464 | if (pt->vma == vma) { | |
465 | if (prev) { | |
466 | prev->next = pt->next; | |
467 | } else { | |
468 | dev->vmalist = pt->next; | |
469 | } | |
470 | drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); | |
471 | break; | |
472 | } | |
473 | } | |
30e2fb18 | 474 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
475 | } |
476 | ||
477 | /** | |
478 | * mmap DMA memory. | |
479 | * | |
480 | * \param filp file pointer. | |
481 | * \param vma virtual memory area. | |
482 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 483 | * |
1da177e4 LT |
484 | * Sets the virtual memory area operations structure to vm_dma_ops, the file |
485 | * pointer, and calls vm_open(). | |
486 | */ | |
c94f7029 | 487 | static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 488 | { |
b5e89ed5 DA |
489 | drm_file_t *priv = filp->private_data; |
490 | drm_device_t *dev; | |
1da177e4 | 491 | drm_device_dma_t *dma; |
b5e89ed5 | 492 | unsigned long length = vma->vm_end - vma->vm_start; |
1da177e4 | 493 | |
b5e89ed5 DA |
494 | dev = priv->head->dev; |
495 | dma = dev->dma; | |
1545085a TH |
496 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
497 | vma->vm_start, vma->vm_end, vma->vm_pgoff); | |
1da177e4 | 498 | |
b5e89ed5 | 499 | /* Length must match exact page count */ |
1da177e4 | 500 | if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { |
1da177e4 LT |
501 | return -EINVAL; |
502 | } | |
1da177e4 | 503 | |
3417f33e GS |
504 | if (!capable(CAP_SYS_ADMIN) && |
505 | (dma->flags & _DRM_DMA_USE_PCI_RO)) { | |
506 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
507 | #if defined(__i386__) || defined(__x86_64__) | |
508 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
509 | #else | |
510 | /* Ye gads this is ugly. With more thought | |
511 | we could move this up higher and use | |
512 | `protection_map' instead. */ | |
513 | vma->vm_page_prot = | |
514 | __pgprot(pte_val | |
515 | (pte_wrprotect | |
516 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
517 | #endif | |
518 | } | |
519 | ||
b5e89ed5 | 520 | vma->vm_ops = &drm_vm_dma_ops; |
1da177e4 | 521 | |
b5e89ed5 | 522 | vma->vm_flags |= VM_RESERVED; /* Don't swap */ |
1da177e4 | 523 | |
b5e89ed5 | 524 | vma->vm_file = filp; /* Needed for drm_vm_open() */ |
d7d8aac7 | 525 | drm_vm_open_locked(vma); |
1da177e4 LT |
526 | return 0; |
527 | } | |
528 | ||
b5e89ed5 | 529 | unsigned long drm_core_get_map_ofs(drm_map_t * map) |
1da177e4 LT |
530 | { |
531 | return map->offset; | |
532 | } | |
b5e89ed5 | 533 | |
1da177e4 LT |
534 | EXPORT_SYMBOL(drm_core_get_map_ofs); |
535 | ||
536 | unsigned long drm_core_get_reg_ofs(struct drm_device *dev) | |
537 | { | |
538 | #ifdef __alpha__ | |
539 | return dev->hose->dense_mem_base - dev->hose->mem_space->start; | |
540 | #else | |
541 | return 0; | |
542 | #endif | |
543 | } | |
b5e89ed5 | 544 | |
1da177e4 LT |
545 | EXPORT_SYMBOL(drm_core_get_reg_ofs); |
546 | ||
547 | /** | |
548 | * mmap DMA memory. | |
549 | * | |
550 | * \param filp file pointer. | |
551 | * \param vma virtual memory area. | |
552 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 553 | * |
1da177e4 LT |
554 | * If the virtual memory area has no offset associated with it then it's a DMA |
555 | * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, | |
556 | * checks that the restricted flag is not set, sets the virtual memory operations | |
557 | * according to the mapping type and remaps the pages. Finally sets the file | |
558 | * pointer and calls vm_open(). | |
559 | */ | |
d7d8aac7 | 560 | static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 561 | { |
b5e89ed5 DA |
562 | drm_file_t *priv = filp->private_data; |
563 | drm_device_t *dev = priv->head->dev; | |
564 | drm_map_t *map = NULL; | |
b5e89ed5 | 565 | unsigned long offset = 0; |
8d153f71 | 566 | drm_hash_item_t *hash; |
1da177e4 | 567 | |
1545085a TH |
568 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
569 | vma->vm_start, vma->vm_end, vma->vm_pgoff); | |
1da177e4 | 570 | |
b5e89ed5 DA |
571 | if (!priv->authenticated) |
572 | return -EACCES; | |
1da177e4 LT |
573 | |
574 | /* We check for "dma". On Apple's UniNorth, it's valid to have | |
575 | * the AGP mapped at physical address 0 | |
576 | * --BenH. | |
577 | */ | |
1545085a | 578 | if (!vma->vm_pgoff |
1da177e4 | 579 | #if __OS_HAS_AGP |
b5e89ed5 DA |
580 | && (!dev->agp |
581 | || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) | |
1da177e4 LT |
582 | #endif |
583 | ) | |
584 | return drm_mmap_dma(filp, vma); | |
585 | ||
1545085a | 586 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { |
8d153f71 TH |
587 | DRM_ERROR("Could not find map\n"); |
588 | return -EINVAL; | |
1da177e4 LT |
589 | } |
590 | ||
8d153f71 | 591 | map = drm_hash_entry(hash, drm_map_list_t, hash)->map; |
b5e89ed5 | 592 | if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) |
1da177e4 LT |
593 | return -EPERM; |
594 | ||
b5e89ed5 | 595 | /* Check for valid size. */ |
54ba2f76 | 596 | if (map->size < vma->vm_end - vma->vm_start) |
b5e89ed5 | 597 | return -EINVAL; |
1da177e4 LT |
598 | |
599 | if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { | |
600 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
601 | #if defined(__i386__) || defined(__x86_64__) | |
602 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
603 | #else | |
b5e89ed5 DA |
604 | /* Ye gads this is ugly. With more thought |
605 | we could move this up higher and use | |
606 | `protection_map' instead. */ | |
607 | vma->vm_page_prot = | |
608 | __pgprot(pte_val | |
609 | (pte_wrprotect | |
610 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
1da177e4 LT |
611 | #endif |
612 | } | |
613 | ||
614 | switch (map->type) { | |
b5e89ed5 DA |
615 | case _DRM_AGP: |
616 | if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) { | |
617 | /* | |
618 | * On some platforms we can't talk to bus dma address from the CPU, so for | |
619 | * memory of type DRM_AGP, we'll deal with sorting out the real physical | |
620 | * pages and mappings in nopage() | |
621 | */ | |
1da177e4 | 622 | #if defined(__powerpc__) |
b5e89ed5 | 623 | pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; |
1da177e4 | 624 | #endif |
b5e89ed5 DA |
625 | vma->vm_ops = &drm_vm_ops; |
626 | break; | |
627 | } | |
628 | /* fall through to _DRM_FRAME_BUFFER... */ | |
1da177e4 LT |
629 | case _DRM_FRAME_BUFFER: |
630 | case _DRM_REGISTERS: | |
1da177e4 | 631 | offset = dev->driver->get_reg_ofs(dev); |
5cc7f9ab DA |
632 | vma->vm_flags |= VM_IO; /* not in core dump */ |
633 | vma->vm_page_prot = drm_io_prot(map->type, vma); | |
1da177e4 | 634 | #ifdef __sparc__ |
14778d90 | 635 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
9e9c1326 | 636 | #endif |
3d77461e | 637 | if (io_remap_pfn_range(vma, vma->vm_start, |
b5e89ed5 DA |
638 | (map->offset + offset) >> PAGE_SHIFT, |
639 | vma->vm_end - vma->vm_start, | |
640 | vma->vm_page_prot)) | |
b5e89ed5 | 641 | return -EAGAIN; |
1da177e4 LT |
642 | DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," |
643 | " offset = 0x%lx\n", | |
644 | map->type, | |
d1f2b55a | 645 | vma->vm_start, vma->vm_end, map->offset + offset); |
1da177e4 LT |
646 | vma->vm_ops = &drm_vm_ops; |
647 | break; | |
2d0f9eaf | 648 | case _DRM_CONSISTENT: |
38315878 HD |
649 | /* Consistent memory is really like shared memory. But |
650 | * it's allocated in a different way, so avoid nopage */ | |
651 | if (remap_pfn_range(vma, vma->vm_start, | |
652 | page_to_pfn(virt_to_page(map->handle)), | |
653 | vma->vm_end - vma->vm_start, vma->vm_page_prot)) | |
654 | return -EAGAIN; | |
655 | /* fall through to _DRM_SHM */ | |
656 | case _DRM_SHM: | |
1da177e4 LT |
657 | vma->vm_ops = &drm_vm_shm_ops; |
658 | vma->vm_private_data = (void *)map; | |
b5e89ed5 DA |
659 | /* Don't let this area swap. Change when |
660 | DRM_KERNEL advisory is supported. */ | |
1da177e4 | 661 | vma->vm_flags |= VM_RESERVED; |
1da177e4 LT |
662 | break; |
663 | case _DRM_SCATTER_GATHER: | |
664 | vma->vm_ops = &drm_vm_sg_ops; | |
665 | vma->vm_private_data = (void *)map; | |
1da177e4 | 666 | vma->vm_flags |= VM_RESERVED; |
b5e89ed5 | 667 | break; |
1da177e4 LT |
668 | default: |
669 | return -EINVAL; /* This should never happen. */ | |
670 | } | |
b5e89ed5 | 671 | vma->vm_flags |= VM_RESERVED; /* Don't swap */ |
1da177e4 | 672 | |
b5e89ed5 | 673 | vma->vm_file = filp; /* Needed for drm_vm_open() */ |
d7d8aac7 | 674 | drm_vm_open_locked(vma); |
1da177e4 LT |
675 | return 0; |
676 | } | |
b5e89ed5 | 677 | |
d7d8aac7 TH |
678 | int drm_mmap(struct file *filp, struct vm_area_struct *vma) |
679 | { | |
680 | drm_file_t *priv = filp->private_data; | |
681 | drm_device_t *dev = priv->head->dev; | |
682 | int ret; | |
683 | ||
684 | mutex_lock(&dev->struct_mutex); | |
685 | ret = drm_mmap_locked(filp, vma); | |
686 | mutex_unlock(&dev->struct_mutex); | |
687 | ||
688 | return ret; | |
689 | } | |
1da177e4 | 690 | EXPORT_SYMBOL(drm_mmap); |