blob: ef5e6b130c4845aa8b3ad68b36538b34d90e6311 [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 Airlie84b1fd12007-07-11 15:53:27 +100082 struct drm_file *priv = vma->vm_file->private_data;
83 struct drm_device *dev = priv->head->dev;
Dave Airliec60ce622007-07-11 15:27:12 +100084 struct drm_map *map = NULL;
Dave Airlie55910512007-07-11 16:53:40 +100085 struct drm_map_list *r_list;
Dave Airliee0be4282007-07-12 10:26:44 +100086 struct drm_hash_item *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
Dave Airlie55910512007-07-11 16:53:40 +1000100 r_list = drm_hash_entry(hash, struct drm_map_list, hash);
Thomas Hellstrom8d153f72006-08-07 22:36:47 +1000101 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 */
Dave Airliebd1b3312007-05-26 05:01:51 +1000119 list_for_each_entry(agpmem, &dev->agp->memory, head) {
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 Airliec60ce622007-07-11 15:27:12 +1000166 struct drm_map *map = (struct drm_map *) vma->vm_private_data;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000167 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 Airlie84b1fd12007-07-11 15:53:27 +1000197 struct drm_file *priv = vma->vm_file->private_data;
198 struct drm_device *dev = priv->head->dev;
Dave Airlie8fc2fdf2007-07-11 16:21:47 +1000199 struct drm_vma_entry *pt, *temp;
Dave Airliec60ce622007-07-11 15:27:12 +1000200 struct drm_map *map;
Dave Airlie55910512007-07-11 16:53:40 +1000201 struct drm_map_list *r_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 int found_maps = 0;
203
204 DRM_DEBUG("0x%08lx,0x%08lx\n",
205 vma->vm_start, vma->vm_end - vma->vm_start);
206 atomic_dec(&dev->vma_count);
207
208 map = vma->vm_private_data;
209
Dave Airlie30e2fb12006-02-02 19:37:46 +1100210 mutex_lock(&dev->struct_mutex);
Dave Airliebd1b3312007-05-26 05:01:51 +1000211 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000212 if (pt->vma->vm_private_data == map)
213 found_maps++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 if (pt->vma == vma) {
Dave Airliebd1b3312007-05-26 05:01:51 +1000215 list_del(&pt->head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 }
218 }
Dave Airliebd1b3312007-05-26 05:01:51 +1000219
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 /* We were the only map that was found */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000221 if (found_maps == 1 && map->flags & _DRM_REMOVABLE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 /* Check to see if we are in the maplist, if we are not, then
223 * we delete this mappings information.
224 */
225 found_maps = 0;
Dave Airliebd1b3312007-05-26 05:01:51 +1000226 list_for_each_entry(r_list, &dev->maplist, head) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000227 if (r_list->map == map)
228 found_maps++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 }
230
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000231 if (!found_maps) {
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000232 drm_dma_handle_t dmah;
233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 switch (map->type) {
235 case _DRM_REGISTERS:
236 case _DRM_FRAME_BUFFER:
237 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
238 int retcode;
239 retcode = mtrr_del(map->mtrr,
240 map->offset,
241 map->size);
242 DRM_DEBUG("mtrr_del = %d\n", retcode);
243 }
Christoph Hellwig004a7722007-01-08 21:56:59 +1100244 iounmap(map->handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 break;
246 case _DRM_SHM:
247 vfree(map->handle);
248 break;
249 case _DRM_AGP:
250 case _DRM_SCATTER_GATHER:
251 break;
Dave Airlie2d0f9ea2005-07-10 14:34:13 +1000252 case _DRM_CONSISTENT:
Dave Airlie9c8da5e2005-07-10 15:38:56 +1000253 dmah.vaddr = map->handle;
254 dmah.busaddr = map->offset;
255 dmah.size = map->size;
256 __drm_pci_free(dev, &dmah);
Dave Airlie2d0f9ea2005-07-10 14:34:13 +1000257 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 }
259 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
260 }
261 }
Dave Airlie30e2fb12006-02-02 19:37:46 +1100262 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263}
264
265/**
266 * \c nopage method for DMA virtual memory.
267 *
268 * \param vma virtual memory area.
269 * \param address access address.
270 * \return pointer to the page structure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000271 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 * Determine the page number from the page offset and get it from drm_device_dma::pagelist.
273 */
274static __inline__ struct page *drm_do_vm_dma_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000275 unsigned long address)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000277 struct drm_file *priv = vma->vm_file->private_data;
278 struct drm_device *dev = priv->head->dev;
Dave Airliecdd55a22007-07-11 16:32:08 +1000279 struct drm_device_dma *dma = dev->dma;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000280 unsigned long offset;
281 unsigned long page_nr;
282 struct page *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000284 if (!dma)
285 return NOPAGE_SIGBUS; /* Error */
286 if (address > vma->vm_end)
287 return NOPAGE_SIGBUS; /* Disallow mremap */
288 if (!dma->pagelist)
Nick Piggincd54e7e2006-12-06 20:31:53 -0800289 return NOPAGE_SIGBUS; /* Nothing allocated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000291 offset = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
292 page_nr = offset >> PAGE_SHIFT;
293 page = virt_to_page((dma->pagelist[page_nr] + (offset & (~PAGE_MASK))));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295 get_page(page);
296
297 DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr);
298 return page;
299}
300
301/**
302 * \c nopage method for scatter-gather virtual memory.
303 *
304 * \param vma virtual memory area.
305 * \param address access address.
306 * \return pointer to the page structure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000307 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 * Determine the map offset from the page offset and get it from drm_sg_mem::pagelist.
309 */
310static __inline__ struct page *drm_do_vm_sg_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000311 unsigned long address)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312{
Dave Airliec60ce622007-07-11 15:27:12 +1000313 struct drm_map *map = (struct drm_map *) vma->vm_private_data;
Dave Airlie84b1fd12007-07-11 15:53:27 +1000314 struct drm_file *priv = vma->vm_file->private_data;
315 struct drm_device *dev = priv->head->dev;
Dave Airlie55910512007-07-11 16:53:40 +1000316 struct drm_sg_mem *entry = dev->sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 unsigned long offset;
318 unsigned long map_offset;
319 unsigned long page_offset;
320 struct page *page;
321
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000322 if (!entry)
323 return NOPAGE_SIGBUS; /* Error */
324 if (address > vma->vm_end)
325 return NOPAGE_SIGBUS; /* Disallow mremap */
326 if (!entry->pagelist)
Nick Piggincd54e7e2006-12-06 20:31:53 -0800327 return NOPAGE_SIGBUS; /* Nothing allocated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
329 offset = address - vma->vm_start;
Dave Airlied1f2b552005-08-05 22:11:22 +1000330 map_offset = map->offset - (unsigned long)dev->sg->virtual;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
332 page = entry->pagelist[page_offset];
333 get_page(page);
334
335 return page;
336}
337
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338static struct page *drm_vm_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000339 unsigned long address, int *type)
340{
341 if (type)
342 *type = VM_FAULT_MINOR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 return drm_do_vm_nopage(vma, address);
344}
345
346static struct page *drm_vm_shm_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000347 unsigned long address, int *type)
348{
349 if (type)
350 *type = VM_FAULT_MINOR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 return drm_do_vm_shm_nopage(vma, address);
352}
353
354static struct page *drm_vm_dma_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000355 unsigned long address, int *type)
356{
357 if (type)
358 *type = VM_FAULT_MINOR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 return drm_do_vm_dma_nopage(vma, address);
360}
361
362static struct page *drm_vm_sg_nopage(struct vm_area_struct *vma,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000363 unsigned long address, int *type)
364{
365 if (type)
366 *type = VM_FAULT_MINOR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 return drm_do_vm_sg_nopage(vma, address);
368}
369
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370/** AGP virtual memory operations */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000371static struct vm_operations_struct drm_vm_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 .nopage = drm_vm_nopage,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000373 .open = drm_vm_open,
374 .close = drm_vm_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375};
376
377/** Shared virtual memory operations */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000378static struct vm_operations_struct drm_vm_shm_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 .nopage = drm_vm_shm_nopage,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000380 .open = drm_vm_open,
381 .close = drm_vm_shm_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382};
383
384/** DMA virtual memory operations */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000385static struct vm_operations_struct drm_vm_dma_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 .nopage = drm_vm_dma_nopage,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000387 .open = drm_vm_open,
388 .close = drm_vm_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389};
390
391/** Scatter-gather virtual memory operations */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000392static struct vm_operations_struct drm_vm_sg_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 .nopage = drm_vm_sg_nopage,
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000394 .open = drm_vm_open,
395 .close = drm_vm_close,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396};
397
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398/**
399 * \c open method for shared virtual memory.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000400 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 * \param vma virtual memory area.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000402 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 * Create a new drm_vma_entry structure as the \p vma private data entry and
404 * add it to drm_device::vmalist.
405 */
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100406static void drm_vm_open_locked(struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000408 struct drm_file *priv = vma->vm_file->private_data;
409 struct drm_device *dev = priv->head->dev;
Dave Airlie8fc2fdf2007-07-11 16:21:47 +1000410 struct drm_vma_entry *vma_entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
412 DRM_DEBUG("0x%08lx,0x%08lx\n",
413 vma->vm_start, vma->vm_end - vma->vm_start);
414 atomic_inc(&dev->vma_count);
415
416 vma_entry = drm_alloc(sizeof(*vma_entry), DRM_MEM_VMAS);
417 if (vma_entry) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000418 vma_entry->vma = vma;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000419 vma_entry->pid = current->pid;
Dave Airliebd1b3312007-05-26 05:01:51 +1000420 list_add(&vma_entry->head, &dev->vmalist);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 }
422}
423
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100424static void drm_vm_open(struct vm_area_struct *vma)
425{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000426 struct drm_file *priv = vma->vm_file->private_data;
427 struct drm_device *dev = priv->head->dev;
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100428
429 mutex_lock(&dev->struct_mutex);
430 drm_vm_open_locked(vma);
431 mutex_unlock(&dev->struct_mutex);
432}
433
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434/**
435 * \c close method for all virtual memory types.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000436 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 * \param vma virtual memory area.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000438 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 * Search the \p vma private data entry in drm_device::vmalist, unlink it, and
440 * free it.
441 */
Dave Airliec94f7022005-07-07 21:03:38 +1000442static void drm_vm_close(struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000444 struct drm_file *priv = vma->vm_file->private_data;
445 struct drm_device *dev = priv->head->dev;
Dave Airlie8fc2fdf2007-07-11 16:21:47 +1000446 struct drm_vma_entry *pt, *temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
448 DRM_DEBUG("0x%08lx,0x%08lx\n",
449 vma->vm_start, vma->vm_end - vma->vm_start);
450 atomic_dec(&dev->vma_count);
451
Dave Airlie30e2fb12006-02-02 19:37:46 +1100452 mutex_lock(&dev->struct_mutex);
Dave Airliebd1b3312007-05-26 05:01:51 +1000453 list_for_each_entry_safe(pt, temp, &dev->vmalist, head) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 if (pt->vma == vma) {
Dave Airliebd1b3312007-05-26 05:01:51 +1000455 list_del(&pt->head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 drm_free(pt, sizeof(*pt), DRM_MEM_VMAS);
457 break;
458 }
459 }
Dave Airlie30e2fb12006-02-02 19:37:46 +1100460 mutex_unlock(&dev->struct_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461}
462
463/**
464 * mmap DMA memory.
465 *
Eric Anholt6c340ea2007-08-25 20:23:09 +1000466 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 * \param vma virtual memory area.
468 * \return zero on success or a negative number on failure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000469 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 * Sets the virtual memory area operations structure to vm_dma_ops, the file
471 * pointer, and calls vm_open().
472 */
Dave Airliec94f7022005-07-07 21:03:38 +1000473static int drm_mmap_dma(struct file *filp, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000475 struct drm_file *priv = filp->private_data;
476 struct drm_device *dev;
Dave Airliecdd55a22007-07-11 16:32:08 +1000477 struct drm_device_dma *dma;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000478 unsigned long length = vma->vm_end - vma->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000480 dev = priv->head->dev;
481 dma = dev->dma;
Thomas Hellstrom15450852007-02-08 16:14:05 +1100482 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
483 vma->vm_start, vma->vm_end, vma->vm_pgoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000485 /* Length must match exact page count */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 return -EINVAL;
488 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489
George Sapountzis3417f332006-10-24 12:03:04 -0700490 if (!capable(CAP_SYS_ADMIN) &&
491 (dma->flags & _DRM_DMA_USE_PCI_RO)) {
492 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
493#if defined(__i386__) || defined(__x86_64__)
494 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
495#else
496 /* Ye gads this is ugly. With more thought
497 we could move this up higher and use
498 `protection_map' instead. */
499 vma->vm_page_prot =
500 __pgprot(pte_val
501 (pte_wrprotect
502 (__pte(pgprot_val(vma->vm_page_prot)))));
503#endif
504 }
505
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000506 vma->vm_ops = &drm_vm_dma_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000508 vma->vm_flags |= VM_RESERVED; /* Don't swap */
Nick Piggin2f987352008-02-02 03:08:53 +0100509 vma->vm_flags |= VM_DONTEXPAND;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000511 vma->vm_file = filp; /* Needed for drm_vm_open() */
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100512 drm_vm_open_locked(vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 return 0;
514}
515
Dave Airliec60ce622007-07-11 15:27:12 +1000516unsigned long drm_core_get_map_ofs(struct drm_map * map)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517{
518 return map->offset;
519}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000520
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521EXPORT_SYMBOL(drm_core_get_map_ofs);
522
523unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
524{
525#ifdef __alpha__
526 return dev->hose->dense_mem_base - dev->hose->mem_space->start;
527#else
528 return 0;
529#endif
530}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532EXPORT_SYMBOL(drm_core_get_reg_ofs);
533
534/**
535 * mmap DMA memory.
536 *
Eric Anholt6c340ea2007-08-25 20:23:09 +1000537 * \param file_priv DRM file private.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 * \param vma virtual memory area.
539 * \return zero on success or a negative number on failure.
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000540 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 * If the virtual memory area has no offset associated with it then it's a DMA
542 * area, so calls mmap_dma(). Otherwise searches the map in drm_device::maplist,
543 * checks that the restricted flag is not set, sets the virtual memory operations
544 * according to the mapping type and remaps the pages. Finally sets the file
545 * pointer and calls vm_open().
546 */
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100547static int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000549 struct drm_file *priv = filp->private_data;
550 struct drm_device *dev = priv->head->dev;
Dave Airliec60ce622007-07-11 15:27:12 +1000551 struct drm_map *map = NULL;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000552 unsigned long offset = 0;
Dave Airliee0be4282007-07-12 10:26:44 +1000553 struct drm_hash_item *hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
Thomas Hellstrom15450852007-02-08 16:14:05 +1100555 DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
556 vma->vm_start, vma->vm_end, vma->vm_pgoff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000558 if (!priv->authenticated)
559 return -EACCES;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
561 /* We check for "dma". On Apple's UniNorth, it's valid to have
562 * the AGP mapped at physical address 0
563 * --BenH.
564 */
Thomas Hellstrom15450852007-02-08 16:14:05 +1100565 if (!vma->vm_pgoff
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566#if __OS_HAS_AGP
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000567 && (!dev->agp
568 || dev->agp->agp_info.device->vendor != PCI_VENDOR_ID_APPLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569#endif
570 )
571 return drm_mmap_dma(filp, vma);
572
Thomas Hellstrom15450852007-02-08 16:14:05 +1100573 if (drm_ht_find_item(&dev->map_hash, vma->vm_pgoff, &hash)) {
Thomas Hellstrom8d153f72006-08-07 22:36:47 +1000574 DRM_ERROR("Could not find map\n");
575 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 }
577
Dave Airlie55910512007-07-11 16:53:40 +1000578 map = drm_hash_entry(hash, struct drm_map_list, hash)->map;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000579 if (!map || ((map->flags & _DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 return -EPERM;
581
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000582 /* Check for valid size. */
Dave Airlie54ba2f72007-02-10 12:07:47 +1100583 if (map->size < vma->vm_end - vma->vm_start)
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000584 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
586 if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
587 vma->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
588#if defined(__i386__) || defined(__x86_64__)
589 pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
590#else
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000591 /* Ye gads this is ugly. With more thought
592 we could move this up higher and use
593 `protection_map' instead. */
594 vma->vm_page_prot =
595 __pgprot(pte_val
596 (pte_wrprotect
597 (__pte(pgprot_val(vma->vm_page_prot)))));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598#endif
599 }
600
601 switch (map->type) {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000602 case _DRM_AGP:
603 if (drm_core_has_AGP(dev) && dev->agp->cant_use_aperture) {
604 /*
605 * On some platforms we can't talk to bus dma address from the CPU, so for
606 * memory of type DRM_AGP, we'll deal with sorting out the real physical
607 * pages and mappings in nopage()
608 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609#if defined(__powerpc__)
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000610 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611#endif
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000612 vma->vm_ops = &drm_vm_ops;
613 break;
614 }
615 /* fall through to _DRM_FRAME_BUFFER... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 case _DRM_FRAME_BUFFER:
617 case _DRM_REGISTERS:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 offset = dev->driver->get_reg_ofs(dev);
Dave Airlie5cc7f9a2007-02-10 11:53:13 +1100619 vma->vm_flags |= VM_IO; /* not in core dump */
620 vma->vm_page_prot = drm_io_prot(map->type, vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621#ifdef __sparc__
David S. Miller14778d92006-03-21 02:29:39 -0800622 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623#endif
Dave Airlie9e9c1322007-03-24 17:57:54 +1100624 if (io_remap_pfn_range(vma, vma->vm_start,
625 (map->offset + offset) >> PAGE_SHIFT,
626 vma->vm_end - vma->vm_start,
627 vma->vm_page_prot))
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000628 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx,"
630 " offset = 0x%lx\n",
631 map->type,
Dave Airlied1f2b552005-08-05 22:11:22 +1000632 vma->vm_start, vma->vm_end, map->offset + offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 vma->vm_ops = &drm_vm_ops;
634 break;
Dave Airlie2d0f9ea2005-07-10 14:34:13 +1000635 case _DRM_CONSISTENT:
Hugh Dickins38315872007-03-24 17:55:16 +1100636 /* Consistent memory is really like shared memory. But
637 * it's allocated in a different way, so avoid nopage */
638 if (remap_pfn_range(vma, vma->vm_start,
639 page_to_pfn(virt_to_page(map->handle)),
640 vma->vm_end - vma->vm_start, vma->vm_page_prot))
641 return -EAGAIN;
642 /* fall through to _DRM_SHM */
643 case _DRM_SHM:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 vma->vm_ops = &drm_vm_shm_ops;
645 vma->vm_private_data = (void *)map;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000646 /* Don't let this area swap. Change when
647 DRM_KERNEL advisory is supported. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 vma->vm_flags |= VM_RESERVED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 break;
650 case _DRM_SCATTER_GATHER:
651 vma->vm_ops = &drm_vm_sg_ops;
652 vma->vm_private_data = (void *)map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 vma->vm_flags |= VM_RESERVED;
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000654 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 default:
656 return -EINVAL; /* This should never happen. */
657 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000658 vma->vm_flags |= VM_RESERVED; /* Don't swap */
Nick Piggin2f987352008-02-02 03:08:53 +0100659 vma->vm_flags |= VM_DONTEXPAND;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000661 vma->vm_file = filp; /* Needed for drm_vm_open() */
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100662 drm_vm_open_locked(vma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 return 0;
664}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000665
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100666int drm_mmap(struct file *filp, struct vm_area_struct *vma)
667{
Dave Airlie84b1fd12007-07-11 15:53:27 +1000668 struct drm_file *priv = filp->private_data;
669 struct drm_device *dev = priv->head->dev;
Thomas Hellstromd7d8aac2007-03-24 17:52:49 +1100670 int ret;
671
672 mutex_lock(&dev->struct_mutex);
673 ret = drm_mmap_locked(filp, vma);
674 mutex_unlock(&dev->struct_mutex);
675
676 return ret;
677}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678EXPORT_SYMBOL(drm_mmap);