Commit | Line | Data |
---|---|---|
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; | |
8d153f71 | 62 | drm_hash_item_t *hash; |
1da177e4 LT |
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 | 72 | |
8d153f71 TH |
73 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff << PAGE_SHIFT, &hash)) |
74 | goto vm_nopage_error; | |
75 | ||
76 | r_list = drm_hash_entry(hash, drm_map_list_t, hash); | |
77 | map = r_list->map; | |
1da177e4 LT |
78 | |
79 | if (map && map->type == _DRM_AGP) { | |
80 | unsigned long offset = address - vma->vm_start; | |
d1f2b55a | 81 | unsigned long baddr = map->offset + offset; |
1da177e4 LT |
82 | struct drm_agp_mem *agpmem; |
83 | struct page *page; | |
84 | ||
85 | #ifdef __alpha__ | |
86 | /* | |
b5e89ed5 DA |
87 | * Adjust to a bus-relative address |
88 | */ | |
1da177e4 LT |
89 | baddr -= dev->hose->mem_space->start; |
90 | #endif | |
91 | ||
92 | /* | |
b5e89ed5 DA |
93 | * It's AGP memory - find the real physical page to map |
94 | */ | |
95 | for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) { | |
1da177e4 | 96 | if (agpmem->bound <= baddr && |
b5e89ed5 | 97 | agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) |
1da177e4 LT |
98 | break; |
99 | } | |
100 | ||
b5e89ed5 DA |
101 | if (!agpmem) |
102 | goto vm_nopage_error; | |
1da177e4 LT |
103 | |
104 | /* | |
b5e89ed5 DA |
105 | * Get the page, inc the use count, and return it |
106 | */ | |
1da177e4 LT |
107 | offset = (baddr - agpmem->bound) >> PAGE_SHIFT; |
108 | page = virt_to_page(__va(agpmem->memory->memory[offset])); | |
109 | get_page(page); | |
110 | ||
b5e89ed5 DA |
111 | DRM_DEBUG |
112 | ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n", | |
113 | baddr, __va(agpmem->memory->memory[offset]), offset, | |
114 | page_count(page)); | |
1da177e4 LT |
115 | |
116 | return page; | |
b5e89ed5 DA |
117 | } |
118 | vm_nopage_error: | |
119 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
1da177e4 | 120 | } |
b5e89ed5 | 121 | #else /* __OS_HAS_AGP */ |
1da177e4 | 122 | static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma, |
b5e89ed5 | 123 | unsigned long address) |
1da177e4 LT |
124 | { |
125 | return NOPAGE_SIGBUS; | |
126 | } | |
b5e89ed5 | 127 | #endif /* __OS_HAS_AGP */ |
1da177e4 LT |
128 | |
129 | /** | |
130 | * \c nopage method for shared virtual memory. | |
131 | * | |
132 | * \param vma virtual memory area. | |
133 | * \param address access address. | |
134 | * \return pointer to the page structure. | |
b5e89ed5 | 135 | * |
1da177e4 LT |
136 | * Get the the mapping, find the real physical page to map, get the page, and |
137 | * return it. | |
138 | */ | |
139 | static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 140 | unsigned long address) |
1da177e4 | 141 | { |
b5e89ed5 DA |
142 | drm_map_t *map = (drm_map_t *) vma->vm_private_data; |
143 | unsigned long offset; | |
144 | unsigned long i; | |
145 | struct page *page; | |
1da177e4 | 146 | |
b5e89ed5 DA |
147 | if (address > vma->vm_end) |
148 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
149 | if (!map) | |
150 | return NOPAGE_OOM; /* Nothing allocated */ | |
1da177e4 | 151 | |
b5e89ed5 | 152 | offset = address - vma->vm_start; |
1da177e4 | 153 | i = (unsigned long)map->handle + offset; |
b5e89ed5 | 154 | page = (map->type == _DRM_CONSISTENT) ? |
5fb4dc9b | 155 | virt_to_page((void *)i) : vmalloc_to_page((void *)i); |
1da177e4 LT |
156 | if (!page) |
157 | return NOPAGE_OOM; | |
158 | get_page(page); | |
159 | ||
160 | DRM_DEBUG("shm_nopage 0x%lx\n", address); | |
161 | return page; | |
162 | } | |
163 | ||
1da177e4 LT |
164 | /** |
165 | * \c close method for shared virtual memory. | |
b5e89ed5 | 166 | * |
1da177e4 | 167 | * \param vma virtual memory area. |
b5e89ed5 | 168 | * |
1da177e4 LT |
169 | * Deletes map information if we are the last |
170 | * person to close a mapping and it's not in the global maplist. | |
171 | */ | |
c94f7029 | 172 | static void drm_vm_shm_close(struct vm_area_struct *vma) |
1da177e4 | 173 | { |
b5e89ed5 DA |
174 | drm_file_t *priv = vma->vm_file->private_data; |
175 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
176 | drm_vma_entry_t *pt, *prev, *next; |
177 | drm_map_t *map; | |
178 | drm_map_list_t *r_list; | |
179 | struct list_head *list; | |
180 | int found_maps = 0; | |
181 | ||
182 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
183 | vma->vm_start, vma->vm_end - vma->vm_start); | |
184 | atomic_dec(&dev->vma_count); | |
185 | ||
186 | map = vma->vm_private_data; | |
187 | ||
30e2fb18 | 188 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
189 | for (pt = dev->vmalist, prev = NULL; pt; pt = next) { |
190 | next = pt->next; | |
b5e89ed5 DA |
191 | if (pt->vma->vm_private_data == map) |
192 | found_maps++; | |
1da177e4 LT |
193 | if (pt->vma == vma) { |
194 | if (prev) { | |
195 | prev->next = pt->next; | |
196 | } else { | |
197 | dev->vmalist = pt->next; | |
198 | } | |
199 | drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); | |
200 | } else { | |
201 | prev = pt; | |
202 | } | |
203 | } | |
204 | /* We were the only map that was found */ | |
b5e89ed5 | 205 | if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { |
1da177e4 LT |
206 | /* Check to see if we are in the maplist, if we are not, then |
207 | * we delete this mappings information. | |
208 | */ | |
209 | found_maps = 0; | |
210 | list = &dev->maplist->head; | |
211 | list_for_each(list, &dev->maplist->head) { | |
212 | r_list = list_entry(list, drm_map_list_t, head); | |
b5e89ed5 DA |
213 | if (r_list->map == map) |
214 | found_maps++; | |
1da177e4 LT |
215 | } |
216 | ||
b5e89ed5 | 217 | if (!found_maps) { |
9c8da5eb DA |
218 | drm_dma_handle_t dmah; |
219 | ||
1da177e4 LT |
220 | switch (map->type) { |
221 | case _DRM_REGISTERS: | |
222 | case _DRM_FRAME_BUFFER: | |
223 | if (drm_core_has_MTRR(dev) && map->mtrr >= 0) { | |
224 | int retcode; | |
225 | retcode = mtrr_del(map->mtrr, | |
226 | map->offset, | |
227 | map->size); | |
228 | DRM_DEBUG("mtrr_del = %d\n", retcode); | |
229 | } | |
230 | drm_ioremapfree(map->handle, map->size, dev); | |
231 | break; | |
232 | case _DRM_SHM: | |
233 | vfree(map->handle); | |
234 | break; | |
235 | case _DRM_AGP: | |
236 | case _DRM_SCATTER_GATHER: | |
237 | break; | |
2d0f9eaf | 238 | case _DRM_CONSISTENT: |
9c8da5eb DA |
239 | dmah.vaddr = map->handle; |
240 | dmah.busaddr = map->offset; | |
241 | dmah.size = map->size; | |
242 | __drm_pci_free(dev, &dmah); | |
2d0f9eaf | 243 | break; |
1da177e4 LT |
244 | } |
245 | drm_free(map, sizeof(*map), DRM_MEM_MAPS); | |
246 | } | |
247 | } | |
30e2fb18 | 248 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
249 | } |
250 | ||
251 | /** | |
252 | * \c nopage method for DMA virtual memory. | |
253 | * | |
254 | * \param vma virtual memory area. | |
255 | * \param address access address. | |
256 | * \return pointer to the page structure. | |
b5e89ed5 | 257 | * |
1da177e4 LT |
258 | * Determine the page number from the page offset and get it from drm_device_dma::pagelist. |
259 | */ | |
260 | static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 261 | unsigned long address) |
1da177e4 | 262 | { |
b5e89ed5 DA |
263 | drm_file_t *priv = vma->vm_file->private_data; |
264 | drm_device_t *dev = priv->head->dev; | |
265 | drm_device_dma_t *dma = dev->dma; | |
266 | unsigned long offset; | |
267 | unsigned long page_nr; | |
268 | struct page *page; | |
269 | ||
270 | if (!dma) | |
271 | return NOPAGE_SIGBUS; /* Error */ | |
272 | if (address > vma->vm_end) | |
273 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
274 | if (!dma->pagelist) | |
275 | return NOPAGE_OOM; /* Nothing allocated */ | |
276 | ||
277 | offset = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */ | |
278 | page_nr = offset >> PAGE_SHIFT; | |
279 | page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK)))); | |
1da177e4 LT |
280 | |
281 | get_page(page); | |
282 | ||
283 | DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr); | |
284 | return page; | |
285 | } | |
286 | ||
287 | /** | |
288 | * \c nopage method for scatter-gather virtual memory. | |
289 | * | |
290 | * \param vma virtual memory area. | |
291 | * \param address access address. | |
292 | * \return pointer to the page structure. | |
b5e89ed5 | 293 | * |
1da177e4 LT |
294 | * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. |
295 | */ | |
296 | static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma, | |
b5e89ed5 | 297 | unsigned long address) |
1da177e4 | 298 | { |
b5e89ed5 | 299 | drm_map_t *map = (drm_map_t *) vma->vm_private_data; |
1da177e4 LT |
300 | drm_file_t *priv = vma->vm_file->private_data; |
301 | drm_device_t *dev = priv->head->dev; | |
302 | drm_sg_mem_t *entry = dev->sg; | |
303 | unsigned long offset; | |
304 | unsigned long map_offset; | |
305 | unsigned long page_offset; | |
306 | struct page *page; | |
307 | ||
b5e89ed5 DA |
308 | if (!entry) |
309 | return NOPAGE_SIGBUS; /* Error */ | |
310 | if (address > vma->vm_end) | |
311 | return NOPAGE_SIGBUS; /* Disallow mremap */ | |
312 | if (!entry->pagelist) | |
313 | return NOPAGE_OOM; /* Nothing allocated */ | |
1da177e4 LT |
314 | |
315 | offset = address - vma->vm_start; | |
d1f2b55a | 316 | map_offset = map->offset - (unsigned long)dev->sg->virtual; |
1da177e4 LT |
317 | page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); |
318 | page = entry->pagelist[page_offset]; | |
319 | get_page(page); | |
320 | ||
321 | return page; | |
322 | } | |
323 | ||
1da177e4 | 324 | static struct page *drm_vm_nopage(struct vm_area_struct *vma, |
b5e89ed5 DA |
325 | unsigned long address, int *type) |
326 | { | |
327 | if (type) | |
328 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
329 | return drm_do_vm_nopage(vma, address); |
330 | } | |
331 | ||
332 | static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
333 | unsigned long address, int *type) |
334 | { | |
335 | if (type) | |
336 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
337 | return drm_do_vm_shm_nopage(vma, address); |
338 | } | |
339 | ||
340 | static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
341 | unsigned long address, int *type) |
342 | { | |
343 | if (type) | |
344 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
345 | return drm_do_vm_dma_nopage(vma, address); |
346 | } | |
347 | ||
348 | static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma, | |
b5e89ed5 DA |
349 | unsigned long address, int *type) |
350 | { | |
351 | if (type) | |
352 | *type = VM_FAULT_MINOR; | |
1da177e4 LT |
353 | return drm_do_vm_sg_nopage(vma, address); |
354 | } | |
355 | ||
1da177e4 | 356 | /** AGP virtual memory operations */ |
b5e89ed5 | 357 | static struct vm_operations_struct drm_vm_ops = { |
1da177e4 | 358 | .nopage = drm_vm_nopage, |
b5e89ed5 DA |
359 | .open = drm_vm_open, |
360 | .close = drm_vm_close, | |
1da177e4 LT |
361 | }; |
362 | ||
363 | /** Shared virtual memory operations */ | |
b5e89ed5 | 364 | static struct vm_operations_struct drm_vm_shm_ops = { |
1da177e4 | 365 | .nopage = drm_vm_shm_nopage, |
b5e89ed5 DA |
366 | .open = drm_vm_open, |
367 | .close = drm_vm_shm_close, | |
1da177e4 LT |
368 | }; |
369 | ||
370 | /** DMA virtual memory operations */ | |
b5e89ed5 | 371 | static struct vm_operations_struct drm_vm_dma_ops = { |
1da177e4 | 372 | .nopage = drm_vm_dma_nopage, |
b5e89ed5 DA |
373 | .open = drm_vm_open, |
374 | .close = drm_vm_close, | |
1da177e4 LT |
375 | }; |
376 | ||
377 | /** Scatter-gather virtual memory operations */ | |
b5e89ed5 | 378 | static struct vm_operations_struct drm_vm_sg_ops = { |
1da177e4 | 379 | .nopage = drm_vm_sg_nopage, |
b5e89ed5 DA |
380 | .open = drm_vm_open, |
381 | .close = drm_vm_close, | |
1da177e4 LT |
382 | }; |
383 | ||
1da177e4 LT |
384 | /** |
385 | * \c open method for shared virtual memory. | |
b5e89ed5 | 386 | * |
1da177e4 | 387 | * \param vma virtual memory area. |
b5e89ed5 | 388 | * |
1da177e4 LT |
389 | * Create a new drm_vma_entry structure as the \p vma private data entry and |
390 | * add it to drm_device::vmalist. | |
391 | */ | |
c94f7029 | 392 | static void drm_vm_open(struct vm_area_struct *vma) |
1da177e4 | 393 | { |
b5e89ed5 DA |
394 | drm_file_t *priv = vma->vm_file->private_data; |
395 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
396 | drm_vma_entry_t *vma_entry; |
397 | ||
398 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
399 | vma->vm_start, vma->vm_end - vma->vm_start); | |
400 | atomic_inc(&dev->vma_count); | |
401 | ||
402 | vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS); | |
403 | if (vma_entry) { | |
30e2fb18 | 404 | mutex_lock(&dev->struct_mutex); |
b5e89ed5 | 405 | vma_entry->vma = vma; |
1da177e4 | 406 | vma_entry->next = dev->vmalist; |
b5e89ed5 DA |
407 | vma_entry->pid = current->pid; |
408 | dev->vmalist = vma_entry; | |
30e2fb18 | 409 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
410 | } |
411 | } | |
412 | ||
413 | /** | |
414 | * \c close method for all virtual memory types. | |
b5e89ed5 | 415 | * |
1da177e4 | 416 | * \param vma virtual memory area. |
b5e89ed5 | 417 | * |
1da177e4 LT |
418 | * Search the \p vma private data entry in drm_device::vmalist, unlink it, and |
419 | * free it. | |
420 | */ | |
c94f7029 | 421 | static void drm_vm_close(struct vm_area_struct *vma) |
1da177e4 | 422 | { |
b5e89ed5 DA |
423 | drm_file_t *priv = vma->vm_file->private_data; |
424 | drm_device_t *dev = priv->head->dev; | |
1da177e4 LT |
425 | drm_vma_entry_t *pt, *prev; |
426 | ||
427 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
428 | vma->vm_start, vma->vm_end - vma->vm_start); | |
429 | atomic_dec(&dev->vma_count); | |
430 | ||
30e2fb18 | 431 | mutex_lock(&dev->struct_mutex); |
1da177e4 LT |
432 | for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) { |
433 | if (pt->vma == vma) { | |
434 | if (prev) { | |
435 | prev->next = pt->next; | |
436 | } else { | |
437 | dev->vmalist = pt->next; | |
438 | } | |
439 | drm_free(pt, sizeof(*pt), DRM_MEM_VMAS); | |
440 | break; | |
441 | } | |
442 | } | |
30e2fb18 | 443 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
444 | } |
445 | ||
446 | /** | |
447 | * mmap DMA memory. | |
448 | * | |
449 | * \param filp file pointer. | |
450 | * \param vma virtual memory area. | |
451 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 452 | * |
1da177e4 LT |
453 | * Sets the virtual memory area operations structure to vm_dma_ops, the file |
454 | * pointer, and calls vm_open(). | |
455 | */ | |
c94f7029 | 456 | static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 457 | { |
b5e89ed5 DA |
458 | drm_file_t *priv = filp->private_data; |
459 | drm_device_t *dev; | |
1da177e4 | 460 | drm_device_dma_t *dma; |
b5e89ed5 | 461 | unsigned long length = vma->vm_end - vma->vm_start; |
1da177e4 LT |
462 | |
463 | lock_kernel(); | |
b5e89ed5 DA |
464 | dev = priv->head->dev; |
465 | dma = dev->dma; | |
1da177e4 | 466 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n", |
3d77461e | 467 | vma->vm_start, vma->vm_end, vma->vm_pgoff << PAGE_SHIFT); |
1da177e4 | 468 | |
b5e89ed5 | 469 | /* Length must match exact page count */ |
1da177e4 LT |
470 | if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { |
471 | unlock_kernel(); | |
472 | return -EINVAL; | |
473 | } | |
474 | unlock_kernel(); | |
475 | ||
b5e89ed5 | 476 | vma->vm_ops = &drm_vm_dma_ops; |
1da177e4 | 477 | |
b5e89ed5 | 478 | vma->vm_flags |= VM_RESERVED; /* Don't swap */ |
1da177e4 | 479 | |
b5e89ed5 | 480 | vma->vm_file = filp; /* Needed for drm_vm_open() */ |
1da177e4 LT |
481 | drm_vm_open(vma); |
482 | return 0; | |
483 | } | |
484 | ||
b5e89ed5 | 485 | unsigned long drm_core_get_map_ofs(drm_map_t * map) |
1da177e4 LT |
486 | { |
487 | return map->offset; | |
488 | } | |
b5e89ed5 | 489 | |
1da177e4 LT |
490 | EXPORT_SYMBOL(drm_core_get_map_ofs); |
491 | ||
492 | unsigned long drm_core_get_reg_ofs(struct drm_device *dev) | |
493 | { | |
494 | #ifdef __alpha__ | |
495 | return dev->hose->dense_mem_base - dev->hose->mem_space->start; | |
496 | #else | |
497 | return 0; | |
498 | #endif | |
499 | } | |
b5e89ed5 | 500 | |
1da177e4 LT |
501 | EXPORT_SYMBOL(drm_core_get_reg_ofs); |
502 | ||
503 | /** | |
504 | * mmap DMA memory. | |
505 | * | |
506 | * \param filp file pointer. | |
507 | * \param vma virtual memory area. | |
508 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 509 | * |
1da177e4 LT |
510 | * If the virtual memory area has no offset associated with it then it's a DMA |
511 | * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, | |
512 | * checks that the restricted flag is not set, sets the virtual memory operations | |
513 | * according to the mapping type and remaps the pages. Finally sets the file | |
514 | * pointer and calls vm_open(). | |
515 | */ | |
516 | int drm_mmap(struct file *filp, struct vm_area_struct *vma) | |
517 | { | |
b5e89ed5 DA |
518 | drm_file_t *priv = filp->private_data; |
519 | drm_device_t *dev = priv->head->dev; | |
520 | drm_map_t *map = NULL; | |
b5e89ed5 | 521 | unsigned long offset = 0; |
8d153f71 | 522 | drm_hash_item_t *hash; |
1da177e4 LT |
523 | |
524 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n", | |
3d77461e | 525 | vma->vm_start, vma->vm_end, vma->vm_pgoff << PAGE_SHIFT); |
1da177e4 | 526 | |
b5e89ed5 DA |
527 | if (!priv->authenticated) |
528 | return -EACCES; | |
1da177e4 LT |
529 | |
530 | /* We check for "dma". On Apple's UniNorth, it's valid to have | |
531 | * the AGP mapped at physical address 0 | |
532 | * --BenH. | |
533 | */ | |
3d77461e | 534 | if (!(vma->vm_pgoff << PAGE_SHIFT) |
1da177e4 | 535 | #if __OS_HAS_AGP |
b5e89ed5 DA |
536 | && (!dev->agp |
537 | || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) | |
1da177e4 LT |
538 | #endif |
539 | ) | |
540 | return drm_mmap_dma(filp, vma); | |
541 | ||
8d153f71 TH |
542 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff << PAGE_SHIFT, &hash)) { |
543 | DRM_ERROR("Could not find map\n"); | |
544 | return -EINVAL; | |
1da177e4 LT |
545 | } |
546 | ||
8d153f71 | 547 | map = drm_hash_entry(hash, drm_map_list_t, hash)->map; |
b5e89ed5 | 548 | if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) |
1da177e4 LT |
549 | return -EPERM; |
550 | ||
b5e89ed5 DA |
551 | /* Check for valid size. */ |
552 | if (map->size != vma->vm_end - vma->vm_start) | |
553 | return -EINVAL; | |
1da177e4 LT |
554 | |
555 | if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { | |
556 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
557 | #if defined(__i386__) || defined(__x86_64__) | |
558 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
559 | #else | |
b5e89ed5 DA |
560 | /* Ye gads this is ugly. With more thought |
561 | we could move this up higher and use | |
562 | `protection_map' instead. */ | |
563 | vma->vm_page_prot = | |
564 | __pgprot(pte_val | |
565 | (pte_wrprotect | |
566 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
1da177e4 LT |
567 | #endif |
568 | } | |
569 | ||
570 | switch (map->type) { | |
b5e89ed5 DA |
571 | case _DRM_AGP: |
572 | if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) { | |
573 | /* | |
574 | * On some platforms we can't talk to bus dma address from the CPU, so for | |
575 | * memory of type DRM_AGP, we'll deal with sorting out the real physical | |
576 | * pages and mappings in nopage() | |
577 | */ | |
1da177e4 | 578 | #if defined(__powerpc__) |
b5e89ed5 | 579 | pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; |
1da177e4 | 580 | #endif |
b5e89ed5 DA |
581 | vma->vm_ops = &drm_vm_ops; |
582 | break; | |
583 | } | |
584 | /* fall through to _DRM_FRAME_BUFFER... */ | |
1da177e4 LT |
585 | case _DRM_FRAME_BUFFER: |
586 | case _DRM_REGISTERS: | |
1da177e4 | 587 | #if defined(__i386__) || defined(__x86_64__) |
88f399cd DA |
588 | if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) { |
589 | pgprot_val(vma->vm_page_prot) |= _PAGE_PCD; | |
590 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT; | |
591 | } | |
1da177e4 | 592 | #elif defined(__powerpc__) |
88f399cd DA |
593 | pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; |
594 | if (map->type == _DRM_REGISTERS) | |
595 | pgprot_val(vma->vm_page_prot) |= _PAGE_GUARDED; | |
1da177e4 | 596 | #endif |
88f399cd | 597 | vma->vm_flags |= VM_IO; /* not in core dump */ |
1da177e4 | 598 | #if defined(__ia64__) |
b5e89ed5 | 599 | if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start)) |
1da177e4 | 600 | vma->vm_page_prot = |
b5e89ed5 | 601 | pgprot_writecombine(vma->vm_page_prot); |
1da177e4 | 602 | else |
b5e89ed5 | 603 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
1da177e4 LT |
604 | #endif |
605 | offset = dev->driver->get_reg_ofs(dev); | |
606 | #ifdef __sparc__ | |
14778d90 | 607 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
3d77461e | 608 | if (io_remap_pfn_range(vma, vma->vm_start, |
b5e89ed5 DA |
609 | (map->offset + offset) >> PAGE_SHIFT, |
610 | vma->vm_end - vma->vm_start, | |
611 | vma->vm_page_prot)) | |
1da177e4 LT |
612 | #else |
613 | if (io_remap_pfn_range(vma, vma->vm_start, | |
b5e89ed5 DA |
614 | (map->offset + offset) >> PAGE_SHIFT, |
615 | vma->vm_end - vma->vm_start, | |
616 | vma->vm_page_prot)) | |
1da177e4 | 617 | #endif |
b5e89ed5 | 618 | return -EAGAIN; |
1da177e4 LT |
619 | DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," |
620 | " offset = 0x%lx\n", | |
621 | map->type, | |
d1f2b55a | 622 | vma->vm_start, vma->vm_end, map->offset + offset); |
1da177e4 LT |
623 | vma->vm_ops = &drm_vm_ops; |
624 | break; | |
625 | case _DRM_SHM: | |
2d0f9eaf DA |
626 | case _DRM_CONSISTENT: |
627 | /* Consistent memory is really like shared memory. It's only | |
628 | * allocate in a different way */ | |
1da177e4 LT |
629 | vma->vm_ops = &drm_vm_shm_ops; |
630 | vma->vm_private_data = (void *)map; | |
b5e89ed5 DA |
631 | /* Don't let this area swap. Change when |
632 | DRM_KERNEL advisory is supported. */ | |
1da177e4 | 633 | vma->vm_flags |= VM_RESERVED; |
1da177e4 LT |
634 | break; |
635 | case _DRM_SCATTER_GATHER: | |
636 | vma->vm_ops = &drm_vm_sg_ops; | |
637 | vma->vm_private_data = (void *)map; | |
1da177e4 | 638 | vma->vm_flags |= VM_RESERVED; |
b5e89ed5 | 639 | break; |
1da177e4 LT |
640 | default: |
641 | return -EINVAL; /* This should never happen. */ | |
642 | } | |
b5e89ed5 | 643 | vma->vm_flags |= VM_RESERVED; /* Don't swap */ |
1da177e4 | 644 | |
b5e89ed5 | 645 | vma->vm_file = filp; /* Needed for drm_vm_open() */ |
1da177e4 LT |
646 | drm_vm_open(vma); |
647 | return 0; | |
648 | } | |
b5e89ed5 | 649 | |
1da177e4 | 650 | EXPORT_SYMBOL(drm_mmap); |