blob: b5c5b9fa84c3cd55bf7e0c8343fe6e6dc15771c3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/**
Dave Airlieb5e89ed2005-09-25 14:28:13 +10002 * \file drm_vm.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Memory mapping for DRM
Dave Airlieb5e89ed2005-09-25 14:28:13 +10004 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * \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
Dave Airliec94f7022005-07-07 21:03:38 +100041static void drm_vm_open(struct vm_area_struct *vma);
42static void drm_vm_close(struct vm_area_struct *vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
Adrian Bunk0bead7c2007-03-11 11:41:16 +110044static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma)
Dave Airlie5cc7f9a2007-02-10 11:53:13 +110045{
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070068/**
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.
Dave Airlieb5e89ed2005-09-25 14:28:13 +100074 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 * 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
79static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +100080 unsigned long address)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081{
Dave Airlieb5e89ed2005-09-25 14:28:13 +100082 drm_file_t *priv = vma->vm_file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 drm_device_t *dev = priv->head->dev;
Dave Airlieb5e89ed2005-09-25 14:28:13 +100084 drm_map_t *map = NULL;
85 drm_map_list_t *r_list;
Thomas Hellstrom8d153f72006-08-07 22:36:47 +100086 drm_hash_item_t *hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88 /*
Dave Airlieb5e89ed2005-09-25 14:28:13 +100089 * Find the right map
90 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 if (!drm_core_has_AGP(dev))
92 goto vm_nopage_error;
93
Dave Airlieb5e89ed2005-09-25 14:28:13 +100094 if (!dev->agp || !dev->agp->cant_use_aperture)
95 goto vm_nopage_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Thomas Hellstrom15450852007-02-08 16:14:05 +110097 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash))
Thomas Hellstrom8d153f72006-08-07 22:36:47 +100098 goto vm_nopage_error;
99
100 r_list = drm_hash_entry(hash, drm_map_list_t, hash);
101 map = r_list->map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103 if (map && map->type == _DRM_AGP) {
104 unsigned long offset = address - vma->vm_start;
Dave Airlied1f2b552005-08-05 22:11:22 +1000105 unsigned long baddr = map->offset + offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 struct drm_agp_mem *agpmem;
107 struct page *page;
108
109#ifdef __alpha__
110 /*
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000111 * Adjust to a bus-relative address
112 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 baddr -= dev->hose->mem_space->start;
114#endif
115
116 /*
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000117 * It's AGP memory - find the real physical page to map
118 */
119 for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 if (agpmem->bound <= baddr &&
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000121 agpmem->bound + agpmem->pages * PAGE_SIZE > baddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 break;
123 }
124
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000125 if (!agpmem)
126 goto vm_nopage_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128 /*
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000129 * Get the page, inc the use count, and return it
130 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
132 page = virt_to_page(__va(agpmem->memory->memory[offset]));
133 get_page(page);
134
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000135 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));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
140 return page;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000141 }
142 vm_nopage_error:
143 return NOPAGE_SIGBUS; /* Disallow mremap */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000145#else /* __OS_HAS_AGP */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146static __inline__ struct page *drm_do_vm_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000147 unsigned long address)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
149 return NOPAGE_SIGBUS;
150}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000151#endif /* __OS_HAS_AGP */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
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.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000159 *
Michael Opdenacker59c51592007-05-09 08:57:56 +0200160 * Get the mapping, find the real physical page to map, get the page, and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 * return it.
162 */
163static __inline__ struct page *drm_do_vm_shm_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000164 unsigned long address)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000166 drm_map_t *map = (drm_map_t *) vma->vm_private_data;
167 unsigned long offset;
168 unsigned long i;
169 struct page *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000171 if (address > vma->vm_end)
172 return NOPAGE_SIGBUS; /* Disallow mremap */
173 if (!map)
Nick Piggincd54e7e2006-12-06 20:31:53 -0800174 return NOPAGE_SIGBUS; /* Nothing allocated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000176 offset = address - vma->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 i = (unsigned long)map->handle + offset;
Hugh Dickins38315872007-03-24 17:55:16 +1100178 page = vmalloc_to_page((void *)i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 if (!page)
Nick Piggincd54e7e2006-12-06 20:31:53 -0800180 return NOPAGE_SIGBUS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 get_page(page);
182
183 DRM_DEBUG("shm_nopage 0x%lx\n", address);
184 return page;
185}
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187/**
188 * \c close method for shared virtual memory.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000189 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 * \param vma virtual memory area.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000191 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 * Deletes map information if we are the last
193 * person to close a mapping and it's not in the global maplist.
194 */
Dave Airliec94f7022005-07-07 21:03:38 +1000195static void drm_vm_shm_close(struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000197 drm_file_t *priv = vma->vm_file->private_data;
198 drm_device_t *dev = priv->head->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 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
Dave Airlie30e2fb12006-02-02 19:37:46 +1100211 mutex_lock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 for (pt = dev->vmalist, prev = NULL; pt; pt = next) {
213 next = pt->next;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000214 if (pt->vma->vm_private_data == map)
215 found_maps++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 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 */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000228 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 /* 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);
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000236 if (r_list->map == map)
237 found_maps++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 }
239
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000240 if (!found_maps) {
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000241 drm_dma_handle_t dmah;
242
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 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 }
Christoph Hellwig004a7722007-01-08 21:56:59 +1100253 iounmap(map->handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 break;
255 case _DRM_SHM:
256 vfree(map->handle);
257 break;
258 case _DRM_AGP:
259 case _DRM_SCATTER_GATHER:
260 break;
Dave Airlie2d0f9ea2005-07-10 14:34:13 +1000261 case _DRM_CONSISTENT:
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000262 dmah.vaddr = map->handle;
263 dmah.busaddr = map->offset;
264 dmah.size = map->size;
265 __drm_pci_free(dev, &dmah);
Dave Airlie2d0f9ea2005-07-10 14:34:13 +1000266 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 }
268 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
269 }
270 }
Dave Airlie30e2fb12006-02-02 19:37:46 +1100271 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272}
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.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000280 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
282 */
283static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000284 unsigned long address)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285{
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000286 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000293 if (!dma)
294 return NOPAGE_SIGBUS; /* Error */
295 if (address > vma->vm_end)
296 return NOPAGE_SIGBUS; /* Disallow mremap */
297 if (!dma->pagelist)
Nick Piggincd54e7e2006-12-06 20:31:53 -0800298 return NOPAGE_SIGBUS; /* Nothing allocated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000300 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))));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
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.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000316 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
318 */
319static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000320 unsigned long address)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000322 drm_map_t *map = (drm_map_t *) vma->vm_private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 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
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000331 if (!entry)
332 return NOPAGE_SIGBUS; /* Error */
333 if (address > vma->vm_end)
334 return NOPAGE_SIGBUS; /* Disallow mremap */
335 if (!entry->pagelist)
Nick Piggincd54e7e2006-12-06 20:31:53 -0800336 return NOPAGE_SIGBUS; /* Nothing allocated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338 offset = address - vma->vm_start;
Dave Airlied1f2b552005-08-05 22:11:22 +1000339 map_offset = map->offset - (unsigned long)dev->sg->virtual;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347static struct page *drm_vm_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000348 unsigned long address, int *type)
349{
350 if (type)
351 *type = VM_FAULT_MINOR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 return drm_do_vm_nopage(vma, address);
353}
354
355static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000356 unsigned long address, int *type)
357{
358 if (type)
359 *type = VM_FAULT_MINOR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 return drm_do_vm_shm_nopage(vma, address);
361}
362
363static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000364 unsigned long address, int *type)
365{
366 if (type)
367 *type = VM_FAULT_MINOR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 return drm_do_vm_dma_nopage(vma, address);
369}
370
371static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000372 unsigned long address, int *type)
373{
374 if (type)
375 *type = VM_FAULT_MINOR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 return drm_do_vm_sg_nopage(vma, address);
377}
378
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379/** AGP virtual memory operations */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000380static struct vm_operations_struct drm_vm_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 .nopage = drm_vm_nopage,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000382 .open = drm_vm_open,
383 .close = drm_vm_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384};
385
386/** Shared virtual memory operations */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000387static struct vm_operations_struct drm_vm_shm_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 .nopage = drm_vm_shm_nopage,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000389 .open = drm_vm_open,
390 .close = drm_vm_shm_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391};
392
393/** DMA virtual memory operations */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000394static struct vm_operations_struct drm_vm_dma_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 .nopage = drm_vm_dma_nopage,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000396 .open = drm_vm_open,
397 .close = drm_vm_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398};
399
400/** Scatter-gather virtual memory operations */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000401static struct vm_operations_struct drm_vm_sg_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 .nopage = drm_vm_sg_nopage,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000403 .open = drm_vm_open,
404 .close = drm_vm_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405};
406
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407/**
408 * \c open method for shared virtual memory.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000409 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 * \param vma virtual memory area.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000411 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 * Create a new drm_vma_entry structure as the \p vma private data entry and
413 * add it to drm_device::vmalist.
414 */
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100415static void drm_vm_open_locked(struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416{
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000417 drm_file_t *priv = vma->vm_file->private_data;
418 drm_device_t *dev = priv->head->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 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) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000427 vma_entry->vma = vma;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 vma_entry->next = dev->vmalist;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000429 vma_entry->pid = current->pid;
430 dev->vmalist = vma_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 }
432}
433
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100434static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444/**
445 * \c close method for all virtual memory types.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000446 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 * \param vma virtual memory area.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000448 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
450 * free it.
451 */
Dave Airliec94f7022005-07-07 21:03:38 +1000452static void drm_vm_close(struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000454 drm_file_t *priv = vma->vm_file->private_data;
455 drm_device_t *dev = priv->head->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 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
Dave Airlie30e2fb12006-02-02 19:37:46 +1100462 mutex_lock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 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 }
Dave Airlie30e2fb12006-02-02 19:37:46 +1100474 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475}
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.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000483 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 * Sets the virtual memory area operations structure to vm_dma_ops, the file
485 * pointer, and calls vm_open().
486 */
Dave Airliec94f7022005-07-07 21:03:38 +1000487static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488{
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000489 drm_file_t *priv = filp->private_data;
490 drm_device_t *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 drm_device_dma_t *dma;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000492 unsigned long length = vma->vm_end - vma->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000494 dev = priv->head->dev;
495 dma = dev->dma;
Thomas Hellstrom15450852007-02-08 16:14:05 +1100496 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
497 vma->vm_start, vma->vm_end, vma->vm_pgoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000499 /* Length must match exact page count */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 return -EINVAL;
502 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
George Sapountzis3417f332006-10-24 12:03:04 -0700504 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
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000520 vma->vm_ops = &drm_vm_dma_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000522 vma->vm_flags |= VM_RESERVED; /* Don't swap */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000524 vma->vm_file = filp; /* Needed for drm_vm_open() */
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100525 drm_vm_open_locked(vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 return 0;
527}
528
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000529unsigned long drm_core_get_map_ofs(drm_map_t * map)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530{
531 return map->offset;
532}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000533
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534EXPORT_SYMBOL(drm_core_get_map_ofs);
535
536unsigned 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}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000544
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545EXPORT_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.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000553 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 * 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 */
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100560static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561{
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000562 drm_file_t *priv = filp->private_data;
563 drm_device_t *dev = priv->head->dev;
564 drm_map_t *map = NULL;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000565 unsigned long offset = 0;
Thomas Hellstrom8d153f72006-08-07 22:36:47 +1000566 drm_hash_item_t *hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567
Thomas Hellstrom15450852007-02-08 16:14:05 +1100568 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
569 vma->vm_start, vma->vm_end, vma->vm_pgoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000571 if (!priv->authenticated)
572 return -EACCES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
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 */
Thomas Hellstrom15450852007-02-08 16:14:05 +1100578 if (!vma->vm_pgoff
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579#if __OS_HAS_AGP
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000580 && (!dev->agp
581 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582#endif
583 )
584 return drm_mmap_dma(filp, vma);
585
Thomas Hellstrom15450852007-02-08 16:14:05 +1100586 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
Thomas Hellstrom8d153f72006-08-07 22:36:47 +1000587 DRM_ERROR("Could not find map\n");
588 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 }
590
Thomas Hellstrom8d153f72006-08-07 22:36:47 +1000591 map = drm_hash_entry(hash, drm_map_list_t, hash)->map;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000592 if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 return -EPERM;
594
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000595 /* Check for valid size. */
Dave Airlie54ba2f72007-02-10 12:07:47 +1100596 if (map->size < vma->vm_end - vma->vm_start)
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000597 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598
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
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000604 /* 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)))));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611#endif
612 }
613
614 switch (map->type) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000615 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622#if defined(__powerpc__)
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000623 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624#endif
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000625 vma->vm_ops = &drm_vm_ops;
626 break;
627 }
628 /* fall through to _DRM_FRAME_BUFFER... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 case _DRM_FRAME_BUFFER:
630 case _DRM_REGISTERS:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 offset = dev->driver->get_reg_ofs(dev);
Dave Airlie5cc7f9a2007-02-10 11:53:13 +1100632 vma->vm_flags |= VM_IO; /* not in core dump */
633 vma->vm_page_prot = drm_io_prot(map->type, vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634#ifdef __sparc__
David S. Miller14778d92006-03-21 02:29:39 -0800635 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636#endif
Dave Airlie9e9c1322007-03-24 17:57:54 +1100637 if (io_remap_pfn_range(vma, vma->vm_start,
638 (map->offset + offset) >> PAGE_SHIFT,
639 vma->vm_end - vma->vm_start,
640 vma->vm_page_prot))
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000641 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx,"
643 " offset = 0x%lx\n",
644 map->type,
Dave Airlied1f2b552005-08-05 22:11:22 +1000645 vma->vm_start, vma->vm_end, map->offset + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 vma->vm_ops = &drm_vm_ops;
647 break;
Dave Airlie2d0f9ea2005-07-10 14:34:13 +1000648 case _DRM_CONSISTENT:
Hugh Dickins38315872007-03-24 17:55:16 +1100649 /* 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:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 vma->vm_ops = &drm_vm_shm_ops;
658 vma->vm_private_data = (void *)map;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000659 /* Don't let this area swap. Change when
660 DRM_KERNEL advisory is supported. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 vma->vm_flags |= VM_RESERVED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 break;
663 case _DRM_SCATTER_GATHER:
664 vma->vm_ops = &drm_vm_sg_ops;
665 vma->vm_private_data = (void *)map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 vma->vm_flags |= VM_RESERVED;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000667 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 default:
669 return -EINVAL; /* This should never happen. */
670 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000671 vma->vm_flags |= VM_RESERVED; /* Don't swap */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000673 vma->vm_file = filp; /* Needed for drm_vm_open() */
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100674 drm_vm_open_locked(vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 return 0;
676}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000677
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100678int 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}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690EXPORT_SYMBOL(drm_mmap);