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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 | ||
760285e7 | 36 | #include <drm/drmP.h> |
2d1a8a48 | 37 | #include <linux/export.h> |
03decbe5 | 38 | #include <linux/seq_file.h> |
1da177e4 LT |
39 | #if defined(__ia64__) |
40 | #include <linux/efi.h> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
1da177e4 | 42 | #endif |
2791ee85 | 43 | #include <asm/pgtable.h> |
43fc884e | 44 | #include "drm_internal.h" |
cc5ea594 | 45 | #include "drm_legacy.h" |
1da177e4 | 46 | |
03decbe5 DH |
47 | struct drm_vma_entry { |
48 | struct list_head head; | |
49 | struct vm_area_struct *vma; | |
50 | pid_t pid; | |
51 | }; | |
52 | ||
c94f7029 DA |
53 | static void drm_vm_open(struct vm_area_struct *vma); |
54 | static void drm_vm_close(struct vm_area_struct *vma); | |
1da177e4 | 55 | |
ff47eaf2 AL |
56 | static pgprot_t drm_io_prot(struct drm_local_map *map, |
57 | struct vm_area_struct *vma) | |
5cc7f9ab DA |
58 | { |
59 | pgprot_t tmp = vm_get_page_prot(vma->vm_flags); | |
60 | ||
6bd3110c | 61 | #if defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) |
f435046d AL |
62 | if (map->type == _DRM_REGISTERS && !(map->flags & _DRM_WRITE_COMBINING)) |
63 | tmp = pgprot_noncached(tmp); | |
64 | else | |
65 | tmp = pgprot_writecombine(tmp); | |
6876b3ba | 66 | #elif defined(__ia64__) |
5cc7f9ab DA |
67 | if (efi_range_is_wc(vma->vm_start, vma->vm_end - |
68 | vma->vm_start)) | |
69 | tmp = pgprot_writecombine(tmp); | |
70 | else | |
71 | tmp = pgprot_noncached(tmp); | |
04cf55e1 | 72 | #elif defined(__sparc__) || defined(__arm__) || defined(__mips__) |
6876b3ba BH |
73 | tmp = pgprot_noncached(tmp); |
74 | #endif | |
75 | return tmp; | |
76 | } | |
77 | ||
78 | static pgprot_t drm_dma_prot(uint32_t map_type, struct vm_area_struct *vma) | |
79 | { | |
80 | pgprot_t tmp = vm_get_page_prot(vma->vm_flags); | |
81 | ||
82 | #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE) | |
37035e74 | 83 | tmp = pgprot_noncached_wc(tmp); |
5cc7f9ab DA |
84 | #endif |
85 | return tmp; | |
86 | } | |
87 | ||
1da177e4 | 88 | /** |
ca0b07d9 | 89 | * \c fault method for AGP virtual memory. |
1da177e4 LT |
90 | * |
91 | * \param vma virtual memory area. | |
92 | * \param address access address. | |
93 | * \return pointer to the page structure. | |
b5e89ed5 | 94 | * |
1da177e4 LT |
95 | * Find the right map and if it's AGP memory find the real physical page to |
96 | * map, get the page, increment the use count and return it. | |
97 | */ | |
a7fb8a23 | 98 | #if IS_ENABLED(CONFIG_AGP) |
8f526e12 | 99 | static int drm_vm_fault(struct vm_fault *vmf) |
1da177e4 | 100 | { |
11bac800 | 101 | struct vm_area_struct *vma = vmf->vma; |
84b1fd10 | 102 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 103 | struct drm_device *dev = priv->minor->dev; |
f77d390c | 104 | struct drm_local_map *map = NULL; |
55910517 | 105 | struct drm_map_list *r_list; |
e0be428e | 106 | struct drm_hash_item *hash; |
1da177e4 LT |
107 | |
108 | /* | |
b5e89ed5 DA |
109 | * Find the right map |
110 | */ | |
d9906753 | 111 | if (!dev->agp) |
ca0b07d9 | 112 | goto vm_fault_error; |
1da177e4 | 113 | |
b5e89ed5 | 114 | if (!dev->agp || !dev->agp->cant_use_aperture) |
ca0b07d9 | 115 | goto vm_fault_error; |
1da177e4 | 116 | |
1545085a | 117 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) |
ca0b07d9 | 118 | goto vm_fault_error; |
8d153f71 | 119 | |
55910517 | 120 | r_list = drm_hash_entry(hash, struct drm_map_list, hash); |
8d153f71 | 121 | map = r_list->map; |
1da177e4 LT |
122 | |
123 | if (map && map->type == _DRM_AGP) { | |
ca0b07d9 NP |
124 | /* |
125 | * Using vm_pgoff as a selector forces us to use this unusual | |
126 | * addressing scheme. | |
127 | */ | |
1a29d85e | 128 | resource_size_t offset = vmf->address - vma->vm_start; |
41c2e75e | 129 | resource_size_t baddr = map->offset + offset; |
1da177e4 LT |
130 | struct drm_agp_mem *agpmem; |
131 | struct page *page; | |
132 | ||
133 | #ifdef __alpha__ | |
134 | /* | |
b5e89ed5 DA |
135 | * Adjust to a bus-relative address |
136 | */ | |
1da177e4 LT |
137 | baddr -= dev->hose->mem_space->start; |
138 | #endif | |
139 | ||
140 | /* | |
b5e89ed5 DA |
141 | * It's AGP memory - find the real physical page to map |
142 | */ | |
bd1b331f | 143 | list_for_each_entry(agpmem, &dev->agp->memory, head) { |
1da177e4 | 144 | if (agpmem->bound <= baddr && |
b5e89ed5 | 145 | agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) |
1da177e4 LT |
146 | break; |
147 | } | |
148 | ||
161c4810 | 149 | if (&agpmem->head == &dev->agp->memory) |
ca0b07d9 | 150 | goto vm_fault_error; |
1da177e4 LT |
151 | |
152 | /* | |
b5e89ed5 DA |
153 | * Get the page, inc the use count, and return it |
154 | */ | |
1da177e4 | 155 | offset = (baddr - agpmem->bound) >> PAGE_SHIFT; |
07613ba2 | 156 | page = agpmem->memory->pages[offset]; |
1da177e4 | 157 | get_page(page); |
ca0b07d9 | 158 | vmf->page = page; |
1da177e4 | 159 | |
b5e89ed5 | 160 | DRM_DEBUG |
41c2e75e BH |
161 | ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n", |
162 | (unsigned long long)baddr, | |
07613ba2 | 163 | agpmem->memory->pages[offset], |
41c2e75e | 164 | (unsigned long long)offset, |
b5e89ed5 | 165 | page_count(page)); |
ca0b07d9 | 166 | return 0; |
b5e89ed5 | 167 | } |
ca0b07d9 NP |
168 | vm_fault_error: |
169 | return VM_FAULT_SIGBUS; /* Disallow mremap */ | |
1da177e4 | 170 | } |
a7fb8a23 | 171 | #else |
8f526e12 | 172 | static int drm_vm_fault(struct vm_fault *vmf) |
1da177e4 | 173 | { |
ca0b07d9 | 174 | return VM_FAULT_SIGBUS; |
1da177e4 | 175 | } |
a7fb8a23 | 176 | #endif |
1da177e4 LT |
177 | |
178 | /** | |
179 | * \c nopage method for shared virtual memory. | |
180 | * | |
181 | * \param vma virtual memory area. | |
182 | * \param address access address. | |
183 | * \return pointer to the page structure. | |
b5e89ed5 | 184 | * |
59c51591 | 185 | * Get the mapping, find the real physical page to map, get the page, and |
1da177e4 LT |
186 | * return it. |
187 | */ | |
8f526e12 | 188 | static int drm_vm_shm_fault(struct vm_fault *vmf) |
1da177e4 | 189 | { |
11bac800 | 190 | struct vm_area_struct *vma = vmf->vma; |
f77d390c | 191 | struct drm_local_map *map = vma->vm_private_data; |
b5e89ed5 DA |
192 | unsigned long offset; |
193 | unsigned long i; | |
194 | struct page *page; | |
1da177e4 | 195 | |
b5e89ed5 | 196 | if (!map) |
ca0b07d9 | 197 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
1da177e4 | 198 | |
1a29d85e | 199 | offset = vmf->address - vma->vm_start; |
1da177e4 | 200 | i = (unsigned long)map->handle + offset; |
38315878 | 201 | page = vmalloc_to_page((void *)i); |
1da177e4 | 202 | if (!page) |
ca0b07d9 | 203 | return VM_FAULT_SIGBUS; |
1da177e4 | 204 | get_page(page); |
ca0b07d9 | 205 | vmf->page = page; |
1da177e4 | 206 | |
ca0b07d9 NP |
207 | DRM_DEBUG("shm_fault 0x%lx\n", offset); |
208 | return 0; | |
1da177e4 LT |
209 | } |
210 | ||
1da177e4 LT |
211 | /** |
212 | * \c close method for shared virtual memory. | |
b5e89ed5 | 213 | * |
1da177e4 | 214 | * \param vma virtual memory area. |
b5e89ed5 | 215 | * |
1da177e4 LT |
216 | * Deletes map information if we are the last |
217 | * person to close a mapping and it's not in the global maplist. | |
218 | */ | |
c94f7029 | 219 | static void drm_vm_shm_close(struct vm_area_struct *vma) |
1da177e4 | 220 | { |
84b1fd10 | 221 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 222 | struct drm_device *dev = priv->minor->dev; |
8fc2fdf4 | 223 | struct drm_vma_entry *pt, *temp; |
f77d390c | 224 | struct drm_local_map *map; |
55910517 | 225 | struct drm_map_list *r_list; |
1da177e4 LT |
226 | int found_maps = 0; |
227 | ||
228 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
229 | vma->vm_start, vma->vm_end - vma->vm_start); | |
1da177e4 LT |
230 | |
231 | map = vma->vm_private_data; | |
232 | ||
30e2fb18 | 233 | mutex_lock(&dev->struct_mutex); |
bd1b331f | 234 | list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
b5e89ed5 DA |
235 | if (pt->vma->vm_private_data == map) |
236 | found_maps++; | |
1da177e4 | 237 | if (pt->vma == vma) { |
bd1b331f | 238 | list_del(&pt->head); |
9a298b2a | 239 | kfree(pt); |
1da177e4 LT |
240 | } |
241 | } | |
bd1b331f | 242 | |
1da177e4 | 243 | /* We were the only map that was found */ |
b5e89ed5 | 244 | if (found_maps == 1 && map->flags & _DRM_REMOVABLE) { |
1da177e4 LT |
245 | /* Check to see if we are in the maplist, if we are not, then |
246 | * we delete this mappings information. | |
247 | */ | |
248 | found_maps = 0; | |
bd1b331f | 249 | list_for_each_entry(r_list, &dev->maplist, head) { |
b5e89ed5 DA |
250 | if (r_list->map == map) |
251 | found_maps++; | |
1da177e4 LT |
252 | } |
253 | ||
b5e89ed5 | 254 | if (!found_maps) { |
9c8da5eb DA |
255 | drm_dma_handle_t dmah; |
256 | ||
1da177e4 LT |
257 | switch (map->type) { |
258 | case _DRM_REGISTERS: | |
259 | case _DRM_FRAME_BUFFER: | |
28185647 | 260 | arch_phys_wc_del(map->mtrr); |
004a7727 | 261 | iounmap(map->handle); |
1da177e4 LT |
262 | break; |
263 | case _DRM_SHM: | |
264 | vfree(map->handle); | |
265 | break; | |
266 | case _DRM_AGP: | |
267 | case _DRM_SCATTER_GATHER: | |
268 | break; | |
2d0f9eaf | 269 | case _DRM_CONSISTENT: |
9c8da5eb DA |
270 | dmah.vaddr = map->handle; |
271 | dmah.busaddr = map->offset; | |
272 | dmah.size = map->size; | |
1c96e84e | 273 | __drm_legacy_pci_free(dev, &dmah); |
2d0f9eaf | 274 | break; |
1da177e4 | 275 | } |
9a298b2a | 276 | kfree(map); |
1da177e4 LT |
277 | } |
278 | } | |
30e2fb18 | 279 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
280 | } |
281 | ||
282 | /** | |
ca0b07d9 | 283 | * \c fault method for DMA virtual memory. |
1da177e4 | 284 | * |
1da177e4 LT |
285 | * \param address access address. |
286 | * \return pointer to the page structure. | |
b5e89ed5 | 287 | * |
1da177e4 LT |
288 | * Determine the page number from the page offset and get it from drm_device_dma::pagelist. |
289 | */ | |
8f526e12 | 290 | static int drm_vm_dma_fault(struct vm_fault *vmf) |
1da177e4 | 291 | { |
11bac800 | 292 | struct vm_area_struct *vma = vmf->vma; |
84b1fd10 | 293 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 294 | struct drm_device *dev = priv->minor->dev; |
cdd55a29 | 295 | struct drm_device_dma *dma = dev->dma; |
b5e89ed5 DA |
296 | unsigned long offset; |
297 | unsigned long page_nr; | |
298 | struct page *page; | |
299 | ||
300 | if (!dma) | |
ca0b07d9 | 301 | return VM_FAULT_SIGBUS; /* Error */ |
b5e89ed5 | 302 | if (!dma->pagelist) |
ca0b07d9 | 303 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
b5e89ed5 | 304 | |
1a29d85e JK |
305 | offset = vmf->address - vma->vm_start; |
306 | /* vm_[pg]off[set] should be 0 */ | |
ca0b07d9 | 307 | page_nr = offset >> PAGE_SHIFT; /* page_nr could just be vmf->pgoff */ |
e1e78533 | 308 | page = virt_to_page((void *)dma->pagelist[page_nr]); |
1da177e4 LT |
309 | |
310 | get_page(page); | |
ca0b07d9 | 311 | vmf->page = page; |
1da177e4 | 312 | |
ca0b07d9 NP |
313 | DRM_DEBUG("dma_fault 0x%lx (page %lu)\n", offset, page_nr); |
314 | return 0; | |
1da177e4 LT |
315 | } |
316 | ||
317 | /** | |
ca0b07d9 | 318 | * \c fault method for scatter-gather virtual memory. |
1da177e4 | 319 | * |
1da177e4 LT |
320 | * \param address access address. |
321 | * \return pointer to the page structure. | |
b5e89ed5 | 322 | * |
1da177e4 LT |
323 | * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist. |
324 | */ | |
8f526e12 | 325 | static int drm_vm_sg_fault(struct vm_fault *vmf) |
1da177e4 | 326 | { |
11bac800 | 327 | struct vm_area_struct *vma = vmf->vma; |
f77d390c | 328 | struct drm_local_map *map = vma->vm_private_data; |
84b1fd10 | 329 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 330 | struct drm_device *dev = priv->minor->dev; |
55910517 | 331 | struct drm_sg_mem *entry = dev->sg; |
1da177e4 LT |
332 | unsigned long offset; |
333 | unsigned long map_offset; | |
334 | unsigned long page_offset; | |
335 | struct page *page; | |
336 | ||
b5e89ed5 | 337 | if (!entry) |
ca0b07d9 | 338 | return VM_FAULT_SIGBUS; /* Error */ |
b5e89ed5 | 339 | if (!entry->pagelist) |
ca0b07d9 | 340 | return VM_FAULT_SIGBUS; /* Nothing allocated */ |
1da177e4 | 341 | |
1a29d85e | 342 | offset = vmf->address - vma->vm_start; |
d1f2b55a | 343 | map_offset = map->offset - (unsigned long)dev->sg->virtual; |
1da177e4 LT |
344 | page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT); |
345 | page = entry->pagelist[page_offset]; | |
346 | get_page(page); | |
ca0b07d9 | 347 | vmf->page = page; |
1da177e4 | 348 | |
ca0b07d9 | 349 | return 0; |
1da177e4 LT |
350 | } |
351 | ||
1da177e4 | 352 | /** AGP virtual memory operations */ |
f0f37e2f | 353 | static const struct vm_operations_struct drm_vm_ops = { |
ca0b07d9 | 354 | .fault = drm_vm_fault, |
b5e89ed5 DA |
355 | .open = drm_vm_open, |
356 | .close = drm_vm_close, | |
1da177e4 LT |
357 | }; |
358 | ||
359 | /** Shared virtual memory operations */ | |
f0f37e2f | 360 | static const struct vm_operations_struct drm_vm_shm_ops = { |
ca0b07d9 | 361 | .fault = drm_vm_shm_fault, |
b5e89ed5 DA |
362 | .open = drm_vm_open, |
363 | .close = drm_vm_shm_close, | |
1da177e4 LT |
364 | }; |
365 | ||
366 | /** DMA virtual memory operations */ | |
f0f37e2f | 367 | static const struct vm_operations_struct drm_vm_dma_ops = { |
ca0b07d9 | 368 | .fault = drm_vm_dma_fault, |
b5e89ed5 DA |
369 | .open = drm_vm_open, |
370 | .close = drm_vm_close, | |
1da177e4 LT |
371 | }; |
372 | ||
373 | /** Scatter-gather virtual memory operations */ | |
f0f37e2f | 374 | static const struct vm_operations_struct drm_vm_sg_ops = { |
ca0b07d9 | 375 | .fault = drm_vm_sg_fault, |
b5e89ed5 DA |
376 | .open = drm_vm_open, |
377 | .close = drm_vm_close, | |
1da177e4 LT |
378 | }; |
379 | ||
f47dbdd7 DV |
380 | static void drm_vm_open_locked(struct drm_device *dev, |
381 | struct vm_area_struct *vma) | |
1da177e4 | 382 | { |
8fc2fdf4 | 383 | struct drm_vma_entry *vma_entry; |
1da177e4 LT |
384 | |
385 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
386 | vma->vm_start, vma->vm_end - vma->vm_start); | |
1da177e4 | 387 | |
9a298b2a | 388 | vma_entry = kmalloc(sizeof(*vma_entry), GFP_KERNEL); |
1da177e4 | 389 | if (vma_entry) { |
b5e89ed5 | 390 | vma_entry->vma = vma; |
b5e89ed5 | 391 | vma_entry->pid = current->pid; |
bd1b331f | 392 | list_add(&vma_entry->head, &dev->vmalist); |
1da177e4 LT |
393 | } |
394 | } | |
395 | ||
d7d8aac7 TH |
396 | static void drm_vm_open(struct vm_area_struct *vma) |
397 | { | |
84b1fd10 | 398 | struct drm_file *priv = vma->vm_file->private_data; |
2c14f28b | 399 | struct drm_device *dev = priv->minor->dev; |
d7d8aac7 TH |
400 | |
401 | mutex_lock(&dev->struct_mutex); | |
b06d66be | 402 | drm_vm_open_locked(dev, vma); |
d7d8aac7 TH |
403 | mutex_unlock(&dev->struct_mutex); |
404 | } | |
405 | ||
f47dbdd7 DV |
406 | static void drm_vm_close_locked(struct drm_device *dev, |
407 | struct vm_area_struct *vma) | |
1da177e4 | 408 | { |
8fc2fdf4 | 409 | struct drm_vma_entry *pt, *temp; |
1da177e4 LT |
410 | |
411 | DRM_DEBUG("0x%08lx,0x%08lx\n", | |
412 | vma->vm_start, vma->vm_end - vma->vm_start); | |
1da177e4 | 413 | |
bd1b331f | 414 | list_for_each_entry_safe(pt, temp, &dev->vmalist, head) { |
1da177e4 | 415 | if (pt->vma == vma) { |
bd1b331f | 416 | list_del(&pt->head); |
9a298b2a | 417 | kfree(pt); |
1da177e4 LT |
418 | break; |
419 | } | |
420 | } | |
31dfbc93 CW |
421 | } |
422 | ||
423 | /** | |
424 | * \c close method for all virtual memory types. | |
425 | * | |
426 | * \param vma virtual memory area. | |
427 | * | |
428 | * Search the \p vma private data entry in drm_device::vmalist, unlink it, and | |
429 | * free it. | |
430 | */ | |
431 | static void drm_vm_close(struct vm_area_struct *vma) | |
432 | { | |
433 | struct drm_file *priv = vma->vm_file->private_data; | |
434 | struct drm_device *dev = priv->minor->dev; | |
435 | ||
436 | mutex_lock(&dev->struct_mutex); | |
b06d66be | 437 | drm_vm_close_locked(dev, vma); |
30e2fb18 | 438 | mutex_unlock(&dev->struct_mutex); |
1da177e4 LT |
439 | } |
440 | ||
441 | /** | |
442 | * mmap DMA memory. | |
443 | * | |
6c340eac | 444 | * \param file_priv DRM file private. |
1da177e4 LT |
445 | * \param vma virtual memory area. |
446 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 447 | * |
1da177e4 LT |
448 | * Sets the virtual memory area operations structure to vm_dma_ops, the file |
449 | * pointer, and calls vm_open(). | |
450 | */ | |
c94f7029 | 451 | static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 452 | { |
84b1fd10 DA |
453 | struct drm_file *priv = filp->private_data; |
454 | struct drm_device *dev; | |
cdd55a29 | 455 | struct drm_device_dma *dma; |
b5e89ed5 | 456 | unsigned long length = vma->vm_end - vma->vm_start; |
1da177e4 | 457 | |
2c14f28b | 458 | dev = priv->minor->dev; |
b5e89ed5 | 459 | dma = dev->dma; |
1545085a TH |
460 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
461 | vma->vm_start, vma->vm_end, vma->vm_pgoff); | |
1da177e4 | 462 | |
b5e89ed5 | 463 | /* Length must match exact page count */ |
1da177e4 | 464 | if (!dma || (length >> PAGE_SHIFT) != dma->page_count) { |
1da177e4 LT |
465 | return -EINVAL; |
466 | } | |
1da177e4 | 467 | |
3417f33e GS |
468 | if (!capable(CAP_SYS_ADMIN) && |
469 | (dma->flags & _DRM_DMA_USE_PCI_RO)) { | |
470 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
471 | #if defined(__i386__) || defined(__x86_64__) | |
472 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
473 | #else | |
474 | /* Ye gads this is ugly. With more thought | |
475 | we could move this up higher and use | |
476 | `protection_map' instead. */ | |
477 | vma->vm_page_prot = | |
478 | __pgprot(pte_val | |
479 | (pte_wrprotect | |
480 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
481 | #endif | |
482 | } | |
483 | ||
b5e89ed5 | 484 | vma->vm_ops = &drm_vm_dma_ops; |
1da177e4 | 485 | |
314e51b9 | 486 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
1da177e4 | 487 | |
b06d66be | 488 | drm_vm_open_locked(dev, vma); |
1da177e4 LT |
489 | return 0; |
490 | } | |
491 | ||
cbc60ca0 | 492 | static resource_size_t drm_core_get_reg_ofs(struct drm_device *dev) |
1da177e4 LT |
493 | { |
494 | #ifdef __alpha__ | |
82ba3fef | 495 | return dev->hose->dense_mem_base; |
1da177e4 LT |
496 | #else |
497 | return 0; | |
498 | #endif | |
499 | } | |
b5e89ed5 | 500 | |
1da177e4 LT |
501 | /** |
502 | * mmap DMA memory. | |
503 | * | |
6c340eac | 504 | * \param file_priv DRM file private. |
1da177e4 LT |
505 | * \param vma virtual memory area. |
506 | * \return zero on success or a negative number on failure. | |
b5e89ed5 | 507 | * |
1da177e4 LT |
508 | * If the virtual memory area has no offset associated with it then it's a DMA |
509 | * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist, | |
510 | * checks that the restricted flag is not set, sets the virtual memory operations | |
511 | * according to the mapping type and remaps the pages. Finally sets the file | |
512 | * pointer and calls vm_open(). | |
513 | */ | |
bfbf3c85 | 514 | static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma) |
1da177e4 | 515 | { |
84b1fd10 | 516 | struct drm_file *priv = filp->private_data; |
2c14f28b | 517 | struct drm_device *dev = priv->minor->dev; |
f77d390c | 518 | struct drm_local_map *map = NULL; |
41c2e75e | 519 | resource_size_t offset = 0; |
e0be428e | 520 | struct drm_hash_item *hash; |
1da177e4 | 521 | |
1545085a TH |
522 | DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n", |
523 | vma->vm_start, vma->vm_end, vma->vm_pgoff); | |
1da177e4 | 524 | |
b5e89ed5 DA |
525 | if (!priv->authenticated) |
526 | return -EACCES; | |
1da177e4 LT |
527 | |
528 | /* We check for "dma". On Apple's UniNorth, it's valid to have | |
529 | * the AGP mapped at physical address 0 | |
530 | * --BenH. | |
531 | */ | |
1545085a | 532 | if (!vma->vm_pgoff |
a7fb8a23 | 533 | #if IS_ENABLED(CONFIG_AGP) |
b5e89ed5 DA |
534 | && (!dev->agp |
535 | || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE) | |
1da177e4 LT |
536 | #endif |
537 | ) | |
538 | return drm_mmap_dma(filp, vma); | |
539 | ||
1545085a | 540 | if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) { |
8d153f71 TH |
541 | DRM_ERROR("Could not find map\n"); |
542 | return -EINVAL; | |
1da177e4 LT |
543 | } |
544 | ||
55910517 | 545 | map = drm_hash_entry(hash, struct drm_map_list, hash)->map; |
b5e89ed5 | 546 | if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN))) |
1da177e4 LT |
547 | return -EPERM; |
548 | ||
b5e89ed5 | 549 | /* Check for valid size. */ |
54ba2f76 | 550 | if (map->size < vma->vm_end - vma->vm_start) |
b5e89ed5 | 551 | return -EINVAL; |
1da177e4 LT |
552 | |
553 | if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) { | |
554 | vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE); | |
555 | #if defined(__i386__) || defined(__x86_64__) | |
556 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW; | |
557 | #else | |
b5e89ed5 DA |
558 | /* Ye gads this is ugly. With more thought |
559 | we could move this up higher and use | |
560 | `protection_map' instead. */ | |
561 | vma->vm_page_prot = | |
562 | __pgprot(pte_val | |
563 | (pte_wrprotect | |
564 | (__pte(pgprot_val(vma->vm_page_prot))))); | |
1da177e4 LT |
565 | #endif |
566 | } | |
567 | ||
568 | switch (map->type) { | |
4b7fb9b5 | 569 | #if !defined(__arm__) |
b5e89ed5 | 570 | case _DRM_AGP: |
d9906753 | 571 | if (dev->agp && dev->agp->cant_use_aperture) { |
b5e89ed5 DA |
572 | /* |
573 | * On some platforms we can't talk to bus dma address from the CPU, so for | |
574 | * memory of type DRM_AGP, we'll deal with sorting out the real physical | |
ca0b07d9 | 575 | * pages and mappings in fault() |
b5e89ed5 | 576 | */ |
1da177e4 | 577 | #if defined(__powerpc__) |
37035e74 | 578 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
1da177e4 | 579 | #endif |
b5e89ed5 DA |
580 | vma->vm_ops = &drm_vm_ops; |
581 | break; | |
582 | } | |
583 | /* fall through to _DRM_FRAME_BUFFER... */ | |
4b7fb9b5 | 584 | #endif |
1da177e4 LT |
585 | case _DRM_FRAME_BUFFER: |
586 | case _DRM_REGISTERS: | |
cbc60ca0 | 587 | offset = drm_core_get_reg_ofs(dev); |
ff47eaf2 | 588 | vma->vm_page_prot = drm_io_prot(map, vma); |
3d77461e | 589 | if (io_remap_pfn_range(vma, vma->vm_start, |
b5e89ed5 DA |
590 | (map->offset + offset) >> PAGE_SHIFT, |
591 | vma->vm_end - vma->vm_start, | |
592 | vma->vm_page_prot)) | |
b5e89ed5 | 593 | return -EAGAIN; |
1da177e4 | 594 | DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx," |
41c2e75e | 595 | " offset = 0x%llx\n", |
1da177e4 | 596 | map->type, |
41c2e75e | 597 | vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset)); |
4b7fb9b5 | 598 | |
1da177e4 LT |
599 | vma->vm_ops = &drm_vm_ops; |
600 | break; | |
2d0f9eaf | 601 | case _DRM_CONSISTENT: |
38315878 | 602 | /* Consistent memory is really like shared memory. But |
ca0b07d9 | 603 | * it's allocated in a different way, so avoid fault */ |
38315878 HD |
604 | if (remap_pfn_range(vma, vma->vm_start, |
605 | page_to_pfn(virt_to_page(map->handle)), | |
606 | vma->vm_end - vma->vm_start, vma->vm_page_prot)) | |
607 | return -EAGAIN; | |
6876b3ba | 608 | vma->vm_page_prot = drm_dma_prot(map->type, vma); |
38315878 HD |
609 | /* fall through to _DRM_SHM */ |
610 | case _DRM_SHM: | |
1da177e4 LT |
611 | vma->vm_ops = &drm_vm_shm_ops; |
612 | vma->vm_private_data = (void *)map; | |
1da177e4 LT |
613 | break; |
614 | case _DRM_SCATTER_GATHER: | |
615 | vma->vm_ops = &drm_vm_sg_ops; | |
616 | vma->vm_private_data = (void *)map; | |
5ff64611 | 617 | vma->vm_page_prot = drm_dma_prot(map->type, vma); |
b5e89ed5 | 618 | break; |
1da177e4 LT |
619 | default: |
620 | return -EINVAL; /* This should never happen. */ | |
621 | } | |
314e51b9 | 622 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
1da177e4 | 623 | |
b06d66be | 624 | drm_vm_open_locked(dev, vma); |
1da177e4 LT |
625 | return 0; |
626 | } | |
b5e89ed5 | 627 | |
bfbf3c85 | 628 | int drm_legacy_mmap(struct file *filp, struct vm_area_struct *vma) |
d7d8aac7 | 629 | { |
84b1fd10 | 630 | struct drm_file *priv = filp->private_data; |
2c14f28b | 631 | struct drm_device *dev = priv->minor->dev; |
d7d8aac7 TH |
632 | int ret; |
633 | ||
2c07a21d DA |
634 | if (drm_device_is_unplugged(dev)) |
635 | return -ENODEV; | |
636 | ||
d7d8aac7 TH |
637 | mutex_lock(&dev->struct_mutex); |
638 | ret = drm_mmap_locked(filp, vma); | |
639 | mutex_unlock(&dev->struct_mutex); | |
640 | ||
641 | return ret; | |
642 | } | |
bfbf3c85 | 643 | EXPORT_SYMBOL(drm_legacy_mmap); |
03decbe5 DH |
644 | |
645 | void drm_legacy_vma_flush(struct drm_device *dev) | |
646 | { | |
647 | struct drm_vma_entry *vma, *vma_temp; | |
648 | ||
649 | /* Clear vma list (only needed for legacy drivers) */ | |
650 | list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) { | |
651 | list_del(&vma->head); | |
652 | kfree(vma); | |
653 | } | |
654 | } |