3 * Generic buffer template
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
10 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
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:
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
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.
36 #include <linux/vmalloc.h>
37 #include <linux/slab.h>
38 #include <linux/log2.h>
39 #include <linux/export.h>
40 #include <asm/shmparam.h>
43 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
44 struct drm_local_map *map)
46 struct drm_map_list *entry;
47 list_for_each_entry(entry, &dev->maplist, head) {
49 * Because the kernel-userspace ABI is fixed at a 32-bit offset
50 * while PCI resources may live above that, we only compare the
51 * lower 32 bits of the map offset for maps of type
52 * _DRM_FRAMEBUFFER or _DRM_REGISTERS.
53 * It is assumed that if a driver have more than one resource
54 * of each type, the lower 32 bits are different.
57 map->type != entry->map->type ||
58 entry->master != dev->primary->master)
62 if (map->flags != _DRM_CONTAINS_LOCK)
66 case _DRM_FRAME_BUFFER:
67 if ((entry->map->offset & 0xffffffff) ==
68 (map->offset & 0xffffffff))
70 default: /* Make gcc happy */
73 if (entry->map->offset == map->offset)
80 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
81 unsigned long user_token, int hashed_handle, int shm)
83 int use_hashed_handle, shift;
86 #if (BITS_PER_LONG == 64)
87 use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
88 #elif (BITS_PER_LONG == 32)
89 use_hashed_handle = hashed_handle;
91 #error Unsupported long size. Neither 64 nor 32 bits.
94 if (!use_hashed_handle) {
96 hash->key = user_token >> PAGE_SHIFT;
97 ret = drm_ht_insert_item(&dev->map_hash, hash);
103 add = DRM_MAP_HASH_OFFSET >> PAGE_SHIFT;
104 if (shm && (SHMLBA > PAGE_SIZE)) {
105 int bits = ilog2(SHMLBA >> PAGE_SHIFT) + 1;
107 /* For shared memory, we have to preserve the SHMLBA
108 * bits of the eventual vma->vm_pgoff value during
109 * mmap(). Otherwise we run into cache aliasing problems
110 * on some platforms. On these platforms, the pgoff of
111 * a mmap() request is used to pick a suitable virtual
112 * address for the mmap() region such that it will not
113 * cause cache aliasing problems.
115 * Therefore, make sure the SHMLBA relevant bits of the
116 * hash value we use are equal to those in the original
117 * kernel virtual address.
120 add |= ((user_token >> PAGE_SHIFT) & ((1UL << bits) - 1UL));
123 return drm_ht_just_insert_please(&dev->map_hash, hash,
124 user_token, 32 - PAGE_SHIFT - 3,
129 * Core function to create a range of memory available for mapping by a
132 * Adjusts the memory offset to its absolute value according to the mapping
133 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
134 * applicable and if supported by the kernel.
136 static int drm_addmap_core(struct drm_device * dev, resource_size_t offset,
137 unsigned int size, enum drm_map_type type,
138 enum drm_map_flags flags,
139 struct drm_map_list ** maplist)
141 struct drm_local_map *map;
142 struct drm_map_list *list;
143 drm_dma_handle_t *dmah;
144 unsigned long user_token;
147 map = kmalloc(sizeof(*map), GFP_KERNEL);
151 map->offset = offset;
156 /* Only allow shared memory to be removable since we only keep enough
157 * book keeping information about shared memory to allow for removal
158 * when processes fork.
160 if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
164 DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
165 (unsigned long long)map->offset, map->size, map->type);
167 /* page-align _DRM_SHM maps. They are allocated here so there is no security
168 * hole created by that and it works around various broken drivers that use
169 * a non-aligned quantity to map the SAREA. --BenH
171 if (map->type == _DRM_SHM)
172 map->size = PAGE_ALIGN(map->size);
174 if ((map->offset & (~(resource_size_t)PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
183 case _DRM_FRAME_BUFFER:
184 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
185 if (map->offset + (map->size-1) < map->offset ||
186 map->offset < virt_to_phys(high_memory)) {
191 /* Some drivers preinitialize some maps, without the X Server
192 * needing to be aware of it. Therefore, we just return success
193 * when the server tries to create a duplicate map.
195 list = drm_find_matching_map(dev, map);
197 if (list->map->size != map->size) {
198 DRM_DEBUG("Matching maps of type %d with "
199 "mismatched sizes, (%ld vs %ld)\n",
200 map->type, map->size,
202 list->map->size = map->size;
210 if (map->type == _DRM_FRAME_BUFFER ||
211 (map->flags & _DRM_WRITE_COMBINING)) {
213 arch_phys_wc_add(map->offset, map->size);
215 if (map->type == _DRM_REGISTERS) {
216 if (map->flags & _DRM_WRITE_COMBINING)
217 map->handle = ioremap_wc(map->offset,
220 map->handle = ioremap(map->offset, map->size);
229 list = drm_find_matching_map(dev, map);
231 if(list->map->size != map->size) {
232 DRM_DEBUG("Matching maps of type %d with "
233 "mismatched sizes, (%ld vs %ld)\n",
234 map->type, map->size, list->map->size);
235 list->map->size = map->size;
242 map->handle = vmalloc_user(map->size);
243 DRM_DEBUG("%lu %d %p\n",
244 map->size, order_base_2(map->size), map->handle);
249 map->offset = (unsigned long)map->handle;
250 if (map->flags & _DRM_CONTAINS_LOCK) {
251 /* Prevent a 2nd X Server from creating a 2nd lock */
252 if (dev->primary->master->lock.hw_lock != NULL) {
257 dev->sigdata.lock = dev->primary->master->lock.hw_lock = map->handle; /* Pointer to lock */
261 struct drm_agp_mem *entry;
269 map->offset += dev->hose->mem_space->start;
271 /* In some cases (i810 driver), user space may have already
272 * added the AGP base itself, because dev->agp->base previously
273 * only got set during AGP enable. So, only add the base
274 * address if the map's offset isn't already within the
277 if (map->offset < dev->agp->base ||
278 map->offset > dev->agp->base +
279 dev->agp->agp_info.aper_size * 1024 * 1024 - 1) {
280 map->offset += dev->agp->base;
282 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
284 /* This assumes the DRM is in total control of AGP space.
285 * It's not always the case as AGP can be in the control
286 * of user space (i.e. i810 driver). So this loop will get
287 * skipped and we double check that dev->agp->memory is
288 * actually set as well as being invalid before EPERM'ing
290 list_for_each_entry(entry, &dev->agp->memory, head) {
291 if ((map->offset >= entry->bound) &&
292 (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
297 if (!list_empty(&dev->agp->memory) && !valid) {
301 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
302 (unsigned long long)map->offset, map->size);
306 case _DRM_SCATTER_GATHER:
311 map->offset += (unsigned long)dev->sg->virtual;
313 case _DRM_CONSISTENT:
314 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
315 * As we're limiting the address to 2^32-1 (or less),
316 * casting it down to 32 bits is no problem, but we
317 * need to point to a 64bit variable first. */
318 dmah = drm_pci_alloc(dev, map->size, map->size);
323 map->handle = dmah->vaddr;
324 map->offset = (unsigned long)dmah->busaddr;
332 list = kzalloc(sizeof(*list), GFP_KERNEL);
334 if (map->type == _DRM_REGISTERS)
335 iounmap(map->handle);
341 mutex_lock(&dev->struct_mutex);
342 list_add(&list->head, &dev->maplist);
344 /* Assign a 32-bit handle */
345 /* We do it here so that dev->struct_mutex protects the increment */
346 user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
348 ret = drm_map_handle(dev, &list->hash, user_token, 0,
349 (map->type == _DRM_SHM));
351 if (map->type == _DRM_REGISTERS)
352 iounmap(map->handle);
355 mutex_unlock(&dev->struct_mutex);
359 list->user_token = list->hash.key << PAGE_SHIFT;
360 mutex_unlock(&dev->struct_mutex);
362 if (!(map->flags & _DRM_DRIVER))
363 list->master = dev->primary->master;
368 int drm_addmap(struct drm_device * dev, resource_size_t offset,
369 unsigned int size, enum drm_map_type type,
370 enum drm_map_flags flags, struct drm_local_map ** map_ptr)
372 struct drm_map_list *list;
375 rc = drm_addmap_core(dev, offset, size, type, flags, &list);
377 *map_ptr = list->map;
381 EXPORT_SYMBOL(drm_addmap);
384 * Ioctl to specify a range of memory that is available for mapping by a
387 * \param inode device inode.
388 * \param file_priv DRM file private.
389 * \param cmd command.
390 * \param arg pointer to a drm_map structure.
391 * \return zero on success or a negative value on error.
394 int drm_addmap_ioctl(struct drm_device *dev, void *data,
395 struct drm_file *file_priv)
397 struct drm_map *map = data;
398 struct drm_map_list *maplist;
401 if (!(capable(CAP_SYS_ADMIN) || map->type == _DRM_AGP || map->type == _DRM_SHM))
404 err = drm_addmap_core(dev, map->offset, map->size, map->type,
405 map->flags, &maplist);
410 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
411 map->handle = (void *)(unsigned long)maplist->user_token;
414 * It appears that there are no users of this value whatsoever --
415 * drmAddMap just discards it. Let's not encourage its use.
416 * (Keeping drm_addmap_core's returned mtrr value would be wrong --
417 * it's not a real mtrr index anymore.)
425 * Remove a map private from list and deallocate resources if the mapping
428 * Searches the map on drm_device::maplist, removes it from the list, see if
429 * its being used, and free any associate resource (such as MTRR's) if it's not
434 int drm_rmmap_locked(struct drm_device *dev, struct drm_local_map *map)
436 struct drm_map_list *r_list = NULL, *list_t;
437 drm_dma_handle_t dmah;
439 struct drm_master *master;
441 /* Find the list entry for the map and remove it */
442 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
443 if (r_list->map == map) {
444 master = r_list->master;
445 list_del(&r_list->head);
446 drm_ht_remove_key(&dev->map_hash,
447 r_list->user_token >> PAGE_SHIFT);
459 iounmap(map->handle);
461 case _DRM_FRAME_BUFFER:
462 arch_phys_wc_del(map->mtrr);
467 if (dev->sigdata.lock == master->lock.hw_lock)
468 dev->sigdata.lock = NULL;
469 master->lock.hw_lock = NULL; /* SHM removed */
470 master->lock.file_priv = NULL;
471 wake_up_interruptible_all(&master->lock.lock_queue);
475 case _DRM_SCATTER_GATHER:
477 case _DRM_CONSISTENT:
478 dmah.vaddr = map->handle;
479 dmah.busaddr = map->offset;
480 dmah.size = map->size;
481 __drm_pci_free(dev, &dmah);
488 EXPORT_SYMBOL(drm_rmmap_locked);
490 int drm_rmmap(struct drm_device *dev, struct drm_local_map *map)
494 mutex_lock(&dev->struct_mutex);
495 ret = drm_rmmap_locked(dev, map);
496 mutex_unlock(&dev->struct_mutex);
500 EXPORT_SYMBOL(drm_rmmap);
502 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
503 * the last close of the device, and this is necessary for cleanup when things
504 * exit uncleanly. Therefore, having userland manually remove mappings seems
505 * like a pointless exercise since they're going away anyway.
507 * One use case might be after addmap is allowed for normal users for SHM and
508 * gets used by drivers that the server doesn't need to care about. This seems
511 * \param inode device inode.
512 * \param file_priv DRM file private.
513 * \param cmd command.
514 * \param arg pointer to a struct drm_map structure.
515 * \return zero on success or a negative value on error.
517 int drm_rmmap_ioctl(struct drm_device *dev, void *data,
518 struct drm_file *file_priv)
520 struct drm_map *request = data;
521 struct drm_local_map *map = NULL;
522 struct drm_map_list *r_list;
525 mutex_lock(&dev->struct_mutex);
526 list_for_each_entry(r_list, &dev->maplist, head) {
528 r_list->user_token == (unsigned long)request->handle &&
529 r_list->map->flags & _DRM_REMOVABLE) {
535 /* List has wrapped around to the head pointer, or its empty we didn't
538 if (list_empty(&dev->maplist) || !map) {
539 mutex_unlock(&dev->struct_mutex);
543 /* Register and framebuffer maps are permanent */
544 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
545 mutex_unlock(&dev->struct_mutex);
549 ret = drm_rmmap_locked(dev, map);
551 mutex_unlock(&dev->struct_mutex);
557 * Cleanup after an error on one of the addbufs() functions.
559 * \param dev DRM device.
560 * \param entry buffer entry where the error occurred.
562 * Frees any pages and buffers associated with the given entry.
564 static void drm_cleanup_buf_error(struct drm_device * dev,
565 struct drm_buf_entry * entry)
569 if (entry->seg_count) {
570 for (i = 0; i < entry->seg_count; i++) {
571 if (entry->seglist[i]) {
572 drm_pci_free(dev, entry->seglist[i]);
575 kfree(entry->seglist);
577 entry->seg_count = 0;
580 if (entry->buf_count) {
581 for (i = 0; i < entry->buf_count; i++) {
582 kfree(entry->buflist[i].dev_private);
584 kfree(entry->buflist);
586 entry->buf_count = 0;
592 * Add AGP buffers for DMA transfers.
594 * \param dev struct drm_device to which the buffers are to be added.
595 * \param request pointer to a struct drm_buf_desc describing the request.
596 * \return zero on success or a negative number on failure.
598 * After some sanity checks creates a drm_buf structure for each buffer and
599 * reallocates the buffer list of the same size order to accommodate the new
602 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
604 struct drm_device_dma *dma = dev->dma;
605 struct drm_buf_entry *entry;
606 struct drm_agp_mem *agp_entry;
608 unsigned long offset;
609 unsigned long agp_offset;
618 struct drm_buf **temp_buflist;
623 count = request->count;
624 order = order_base_2(request->size);
627 alignment = (request->flags & _DRM_PAGE_ALIGN)
628 ? PAGE_ALIGN(size) : size;
629 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
630 total = PAGE_SIZE << page_order;
633 agp_offset = dev->agp->base + request->agp_start;
635 DRM_DEBUG("count: %d\n", count);
636 DRM_DEBUG("order: %d\n", order);
637 DRM_DEBUG("size: %d\n", size);
638 DRM_DEBUG("agp_offset: %lx\n", agp_offset);
639 DRM_DEBUG("alignment: %d\n", alignment);
640 DRM_DEBUG("page_order: %d\n", page_order);
641 DRM_DEBUG("total: %d\n", total);
643 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
646 /* Make sure buffers are located in AGP memory that we own */
648 list_for_each_entry(agp_entry, &dev->agp->memory, head) {
649 if ((agp_offset >= agp_entry->bound) &&
650 (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
655 if (!list_empty(&dev->agp->memory) && !valid) {
656 DRM_DEBUG("zone invalid\n");
659 spin_lock(&dev->buf_lock);
661 spin_unlock(&dev->buf_lock);
664 atomic_inc(&dev->buf_alloc);
665 spin_unlock(&dev->buf_lock);
667 mutex_lock(&dev->struct_mutex);
668 entry = &dma->bufs[order];
669 if (entry->buf_count) {
670 mutex_unlock(&dev->struct_mutex);
671 atomic_dec(&dev->buf_alloc);
672 return -ENOMEM; /* May only call once for each order */
675 if (count < 0 || count > 4096) {
676 mutex_unlock(&dev->struct_mutex);
677 atomic_dec(&dev->buf_alloc);
681 entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
682 if (!entry->buflist) {
683 mutex_unlock(&dev->struct_mutex);
684 atomic_dec(&dev->buf_alloc);
688 entry->buf_size = size;
689 entry->page_order = page_order;
693 while (entry->buf_count < count) {
694 buf = &entry->buflist[entry->buf_count];
695 buf->idx = dma->buf_count + entry->buf_count;
696 buf->total = alignment;
700 buf->offset = (dma->byte_count + offset);
701 buf->bus_address = agp_offset + offset;
702 buf->address = (void *)(agp_offset + offset);
706 buf->file_priv = NULL;
708 buf->dev_priv_size = dev->driver->dev_priv_size;
709 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
710 if (!buf->dev_private) {
711 /* Set count correctly so we free the proper amount. */
712 entry->buf_count = count;
713 drm_cleanup_buf_error(dev, entry);
714 mutex_unlock(&dev->struct_mutex);
715 atomic_dec(&dev->buf_alloc);
719 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
723 byte_count += PAGE_SIZE << page_order;
726 DRM_DEBUG("byte_count: %d\n", byte_count);
728 temp_buflist = krealloc(dma->buflist,
729 (dma->buf_count + entry->buf_count) *
730 sizeof(*dma->buflist), GFP_KERNEL);
732 /* Free the entry because it isn't valid */
733 drm_cleanup_buf_error(dev, entry);
734 mutex_unlock(&dev->struct_mutex);
735 atomic_dec(&dev->buf_alloc);
738 dma->buflist = temp_buflist;
740 for (i = 0; i < entry->buf_count; i++) {
741 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
744 dma->buf_count += entry->buf_count;
745 dma->seg_count += entry->seg_count;
746 dma->page_count += byte_count >> PAGE_SHIFT;
747 dma->byte_count += byte_count;
749 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
750 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
752 mutex_unlock(&dev->struct_mutex);
754 request->count = entry->buf_count;
755 request->size = size;
757 dma->flags = _DRM_DMA_USE_AGP;
759 atomic_dec(&dev->buf_alloc);
762 EXPORT_SYMBOL(drm_addbufs_agp);
763 #endif /* __OS_HAS_AGP */
765 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
767 struct drm_device_dma *dma = dev->dma;
773 struct drm_buf_entry *entry;
774 drm_dma_handle_t *dmah;
777 unsigned long offset;
781 unsigned long *temp_pagelist;
782 struct drm_buf **temp_buflist;
784 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
790 if (!capable(CAP_SYS_ADMIN))
793 count = request->count;
794 order = order_base_2(request->size);
797 DRM_DEBUG("count=%d, size=%d (%d), order=%d\n",
798 request->count, request->size, size, order);
800 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
803 alignment = (request->flags & _DRM_PAGE_ALIGN)
804 ? PAGE_ALIGN(size) : size;
805 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
806 total = PAGE_SIZE << page_order;
808 spin_lock(&dev->buf_lock);
810 spin_unlock(&dev->buf_lock);
813 atomic_inc(&dev->buf_alloc);
814 spin_unlock(&dev->buf_lock);
816 mutex_lock(&dev->struct_mutex);
817 entry = &dma->bufs[order];
818 if (entry->buf_count) {
819 mutex_unlock(&dev->struct_mutex);
820 atomic_dec(&dev->buf_alloc);
821 return -ENOMEM; /* May only call once for each order */
824 if (count < 0 || count > 4096) {
825 mutex_unlock(&dev->struct_mutex);
826 atomic_dec(&dev->buf_alloc);
830 entry->buflist = kzalloc(count * sizeof(*entry->buflist), GFP_KERNEL);
831 if (!entry->buflist) {
832 mutex_unlock(&dev->struct_mutex);
833 atomic_dec(&dev->buf_alloc);
837 entry->seglist = kzalloc(count * sizeof(*entry->seglist), GFP_KERNEL);
838 if (!entry->seglist) {
839 kfree(entry->buflist);
840 mutex_unlock(&dev->struct_mutex);
841 atomic_dec(&dev->buf_alloc);
845 /* Keep the original pagelist until we know all the allocations
848 temp_pagelist = kmalloc((dma->page_count + (count << page_order)) *
849 sizeof(*dma->pagelist), GFP_KERNEL);
850 if (!temp_pagelist) {
851 kfree(entry->buflist);
852 kfree(entry->seglist);
853 mutex_unlock(&dev->struct_mutex);
854 atomic_dec(&dev->buf_alloc);
857 memcpy(temp_pagelist,
858 dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
859 DRM_DEBUG("pagelist: %d entries\n",
860 dma->page_count + (count << page_order));
862 entry->buf_size = size;
863 entry->page_order = page_order;
867 while (entry->buf_count < count) {
869 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000);
872 /* Set count correctly so we free the proper amount. */
873 entry->buf_count = count;
874 entry->seg_count = count;
875 drm_cleanup_buf_error(dev, entry);
876 kfree(temp_pagelist);
877 mutex_unlock(&dev->struct_mutex);
878 atomic_dec(&dev->buf_alloc);
881 entry->seglist[entry->seg_count++] = dmah;
882 for (i = 0; i < (1 << page_order); i++) {
883 DRM_DEBUG("page %d @ 0x%08lx\n",
884 dma->page_count + page_count,
885 (unsigned long)dmah->vaddr + PAGE_SIZE * i);
886 temp_pagelist[dma->page_count + page_count++]
887 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
890 offset + size <= total && entry->buf_count < count;
891 offset += alignment, ++entry->buf_count) {
892 buf = &entry->buflist[entry->buf_count];
893 buf->idx = dma->buf_count + entry->buf_count;
894 buf->total = alignment;
897 buf->offset = (dma->byte_count + byte_count + offset);
898 buf->address = (void *)(dmah->vaddr + offset);
899 buf->bus_address = dmah->busaddr + offset;
903 buf->file_priv = NULL;
905 buf->dev_priv_size = dev->driver->dev_priv_size;
906 buf->dev_private = kzalloc(buf->dev_priv_size,
908 if (!buf->dev_private) {
909 /* Set count correctly so we free the proper amount. */
910 entry->buf_count = count;
911 entry->seg_count = count;
912 drm_cleanup_buf_error(dev, entry);
913 kfree(temp_pagelist);
914 mutex_unlock(&dev->struct_mutex);
915 atomic_dec(&dev->buf_alloc);
919 DRM_DEBUG("buffer %d @ %p\n",
920 entry->buf_count, buf->address);
922 byte_count += PAGE_SIZE << page_order;
925 temp_buflist = krealloc(dma->buflist,
926 (dma->buf_count + entry->buf_count) *
927 sizeof(*dma->buflist), GFP_KERNEL);
929 /* Free the entry because it isn't valid */
930 drm_cleanup_buf_error(dev, entry);
931 kfree(temp_pagelist);
932 mutex_unlock(&dev->struct_mutex);
933 atomic_dec(&dev->buf_alloc);
936 dma->buflist = temp_buflist;
938 for (i = 0; i < entry->buf_count; i++) {
939 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
942 /* No allocations failed, so now we can replace the original pagelist
945 if (dma->page_count) {
946 kfree(dma->pagelist);
948 dma->pagelist = temp_pagelist;
950 dma->buf_count += entry->buf_count;
951 dma->seg_count += entry->seg_count;
952 dma->page_count += entry->seg_count << page_order;
953 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
955 mutex_unlock(&dev->struct_mutex);
957 request->count = entry->buf_count;
958 request->size = size;
960 if (request->flags & _DRM_PCI_BUFFER_RO)
961 dma->flags = _DRM_DMA_USE_PCI_RO;
963 atomic_dec(&dev->buf_alloc);
967 EXPORT_SYMBOL(drm_addbufs_pci);
969 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
971 struct drm_device_dma *dma = dev->dma;
972 struct drm_buf_entry *entry;
974 unsigned long offset;
975 unsigned long agp_offset;
984 struct drm_buf **temp_buflist;
986 if (!drm_core_check_feature(dev, DRIVER_SG))
992 if (!capable(CAP_SYS_ADMIN))
995 count = request->count;
996 order = order_base_2(request->size);
999 alignment = (request->flags & _DRM_PAGE_ALIGN)
1000 ? PAGE_ALIGN(size) : size;
1001 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1002 total = PAGE_SIZE << page_order;
1005 agp_offset = request->agp_start;
1007 DRM_DEBUG("count: %d\n", count);
1008 DRM_DEBUG("order: %d\n", order);
1009 DRM_DEBUG("size: %d\n", size);
1010 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1011 DRM_DEBUG("alignment: %d\n", alignment);
1012 DRM_DEBUG("page_order: %d\n", page_order);
1013 DRM_DEBUG("total: %d\n", total);
1015 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1018 spin_lock(&dev->buf_lock);
1020 spin_unlock(&dev->buf_lock);
1023 atomic_inc(&dev->buf_alloc);
1024 spin_unlock(&dev->buf_lock);
1026 mutex_lock(&dev->struct_mutex);
1027 entry = &dma->bufs[order];
1028 if (entry->buf_count) {
1029 mutex_unlock(&dev->struct_mutex);
1030 atomic_dec(&dev->buf_alloc);
1031 return -ENOMEM; /* May only call once for each order */
1034 if (count < 0 || count > 4096) {
1035 mutex_unlock(&dev->struct_mutex);
1036 atomic_dec(&dev->buf_alloc);
1040 entry->buflist = kzalloc(count * sizeof(*entry->buflist),
1042 if (!entry->buflist) {
1043 mutex_unlock(&dev->struct_mutex);
1044 atomic_dec(&dev->buf_alloc);
1048 entry->buf_size = size;
1049 entry->page_order = page_order;
1053 while (entry->buf_count < count) {
1054 buf = &entry->buflist[entry->buf_count];
1055 buf->idx = dma->buf_count + entry->buf_count;
1056 buf->total = alignment;
1060 buf->offset = (dma->byte_count + offset);
1061 buf->bus_address = agp_offset + offset;
1062 buf->address = (void *)(agp_offset + offset
1063 + (unsigned long)dev->sg->virtual);
1067 buf->file_priv = NULL;
1069 buf->dev_priv_size = dev->driver->dev_priv_size;
1070 buf->dev_private = kzalloc(buf->dev_priv_size, GFP_KERNEL);
1071 if (!buf->dev_private) {
1072 /* Set count correctly so we free the proper amount. */
1073 entry->buf_count = count;
1074 drm_cleanup_buf_error(dev, entry);
1075 mutex_unlock(&dev->struct_mutex);
1076 atomic_dec(&dev->buf_alloc);
1080 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1082 offset += alignment;
1084 byte_count += PAGE_SIZE << page_order;
1087 DRM_DEBUG("byte_count: %d\n", byte_count);
1089 temp_buflist = krealloc(dma->buflist,
1090 (dma->buf_count + entry->buf_count) *
1091 sizeof(*dma->buflist), GFP_KERNEL);
1092 if (!temp_buflist) {
1093 /* Free the entry because it isn't valid */
1094 drm_cleanup_buf_error(dev, entry);
1095 mutex_unlock(&dev->struct_mutex);
1096 atomic_dec(&dev->buf_alloc);
1099 dma->buflist = temp_buflist;
1101 for (i = 0; i < entry->buf_count; i++) {
1102 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1105 dma->buf_count += entry->buf_count;
1106 dma->seg_count += entry->seg_count;
1107 dma->page_count += byte_count >> PAGE_SHIFT;
1108 dma->byte_count += byte_count;
1110 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1111 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1113 mutex_unlock(&dev->struct_mutex);
1115 request->count = entry->buf_count;
1116 request->size = size;
1118 dma->flags = _DRM_DMA_USE_SG;
1120 atomic_dec(&dev->buf_alloc);
1125 * Add buffers for DMA transfers (ioctl).
1127 * \param inode device inode.
1128 * \param file_priv DRM file private.
1129 * \param cmd command.
1130 * \param arg pointer to a struct drm_buf_desc request.
1131 * \return zero on success or a negative number on failure.
1133 * According with the memory type specified in drm_buf_desc::flags and the
1134 * build options, it dispatches the call either to addbufs_agp(),
1135 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1136 * PCI memory respectively.
1138 int drm_addbufs(struct drm_device *dev, void *data,
1139 struct drm_file *file_priv)
1141 struct drm_buf_desc *request = data;
1144 if (drm_core_check_feature(dev, DRIVER_MODESET))
1147 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1151 if (request->flags & _DRM_AGP_BUFFER)
1152 ret = drm_addbufs_agp(dev, request);
1155 if (request->flags & _DRM_SG_BUFFER)
1156 ret = drm_addbufs_sg(dev, request);
1157 else if (request->flags & _DRM_FB_BUFFER)
1160 ret = drm_addbufs_pci(dev, request);
1166 * Get information about the buffer mappings.
1168 * This was originally mean for debugging purposes, or by a sophisticated
1169 * client library to determine how best to use the available buffers (e.g.,
1170 * large buffers can be used for image transfer).
1172 * \param inode device inode.
1173 * \param file_priv DRM file private.
1174 * \param cmd command.
1175 * \param arg pointer to a drm_buf_info structure.
1176 * \return zero on success or a negative number on failure.
1178 * Increments drm_device::buf_use while holding the drm_device::buf_lock
1179 * lock, preventing of allocating more buffers after this call. Information
1180 * about each requested buffer is then copied into user space.
1182 int drm_infobufs(struct drm_device *dev, void *data,
1183 struct drm_file *file_priv)
1185 struct drm_device_dma *dma = dev->dma;
1186 struct drm_buf_info *request = data;
1190 if (drm_core_check_feature(dev, DRIVER_MODESET))
1193 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1199 spin_lock(&dev->buf_lock);
1200 if (atomic_read(&dev->buf_alloc)) {
1201 spin_unlock(&dev->buf_lock);
1204 ++dev->buf_use; /* Can't allocate more after this call */
1205 spin_unlock(&dev->buf_lock);
1207 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1208 if (dma->bufs[i].buf_count)
1212 DRM_DEBUG("count = %d\n", count);
1214 if (request->count >= count) {
1215 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1216 if (dma->bufs[i].buf_count) {
1217 struct drm_buf_desc __user *to =
1218 &request->list[count];
1219 struct drm_buf_entry *from = &dma->bufs[i];
1220 if (copy_to_user(&to->count,
1222 sizeof(from->buf_count)) ||
1223 copy_to_user(&to->size,
1225 sizeof(from->buf_size)) ||
1226 copy_to_user(&to->low_mark,
1228 sizeof(from->low_mark)) ||
1229 copy_to_user(&to->high_mark,
1231 sizeof(from->high_mark)))
1234 DRM_DEBUG("%d %d %d %d %d\n",
1236 dma->bufs[i].buf_count,
1237 dma->bufs[i].buf_size,
1238 dma->bufs[i].low_mark,
1239 dma->bufs[i].high_mark);
1244 request->count = count;
1250 * Specifies a low and high water mark for buffer allocation
1252 * \param inode device inode.
1253 * \param file_priv DRM file private.
1254 * \param cmd command.
1255 * \param arg a pointer to a drm_buf_desc structure.
1256 * \return zero on success or a negative number on failure.
1258 * Verifies that the size order is bounded between the admissible orders and
1259 * updates the respective drm_device_dma::bufs entry low and high water mark.
1261 * \note This ioctl is deprecated and mostly never used.
1263 int drm_markbufs(struct drm_device *dev, void *data,
1264 struct drm_file *file_priv)
1266 struct drm_device_dma *dma = dev->dma;
1267 struct drm_buf_desc *request = data;
1269 struct drm_buf_entry *entry;
1271 if (drm_core_check_feature(dev, DRIVER_MODESET))
1274 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1280 DRM_DEBUG("%d, %d, %d\n",
1281 request->size, request->low_mark, request->high_mark);
1282 order = order_base_2(request->size);
1283 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1285 entry = &dma->bufs[order];
1287 if (request->low_mark < 0 || request->low_mark > entry->buf_count)
1289 if (request->high_mark < 0 || request->high_mark > entry->buf_count)
1292 entry->low_mark = request->low_mark;
1293 entry->high_mark = request->high_mark;
1299 * Unreserve the buffers in list, previously reserved using drmDMA.
1301 * \param inode device inode.
1302 * \param file_priv DRM file private.
1303 * \param cmd command.
1304 * \param arg pointer to a drm_buf_free structure.
1305 * \return zero on success or a negative number on failure.
1307 * Calls free_buffer() for each used buffer.
1308 * This function is primarily used for debugging.
1310 int drm_freebufs(struct drm_device *dev, void *data,
1311 struct drm_file *file_priv)
1313 struct drm_device_dma *dma = dev->dma;
1314 struct drm_buf_free *request = data;
1317 struct drm_buf *buf;
1319 if (drm_core_check_feature(dev, DRIVER_MODESET))
1322 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1328 DRM_DEBUG("%d\n", request->count);
1329 for (i = 0; i < request->count; i++) {
1330 if (copy_from_user(&idx, &request->list[i], sizeof(idx)))
1332 if (idx < 0 || idx >= dma->buf_count) {
1333 DRM_ERROR("Index %d (of %d max)\n",
1334 idx, dma->buf_count - 1);
1337 buf = dma->buflist[idx];
1338 if (buf->file_priv != file_priv) {
1339 DRM_ERROR("Process %d freeing buffer not owned\n",
1340 task_pid_nr(current));
1343 drm_free_buffer(dev, buf);
1350 * Maps all of the DMA buffers into client-virtual space (ioctl).
1352 * \param inode device inode.
1353 * \param file_priv DRM file private.
1354 * \param cmd command.
1355 * \param arg pointer to a drm_buf_map structure.
1356 * \return zero on success or a negative number on failure.
1358 * Maps the AGP, SG or PCI buffer region with vm_mmap(), and copies information
1359 * about each buffer into user space. For PCI buffers, it calls vm_mmap() with
1360 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1363 int drm_mapbufs(struct drm_device *dev, void *data,
1364 struct drm_file *file_priv)
1366 struct drm_device_dma *dma = dev->dma;
1369 unsigned long virtual;
1370 unsigned long address;
1371 struct drm_buf_map *request = data;
1374 if (drm_core_check_feature(dev, DRIVER_MODESET))
1377 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1383 spin_lock(&dev->buf_lock);
1384 if (atomic_read(&dev->buf_alloc)) {
1385 spin_unlock(&dev->buf_lock);
1388 dev->buf_use++; /* Can't allocate more after this call */
1389 spin_unlock(&dev->buf_lock);
1391 if (request->count >= dma->buf_count) {
1392 if ((dev->agp && (dma->flags & _DRM_DMA_USE_AGP))
1393 || (drm_core_check_feature(dev, DRIVER_SG)
1394 && (dma->flags & _DRM_DMA_USE_SG))) {
1395 struct drm_local_map *map = dev->agp_buffer_map;
1396 unsigned long token = dev->agp_buffer_token;
1402 virtual = vm_mmap(file_priv->filp, 0, map->size,
1403 PROT_READ | PROT_WRITE,
1407 virtual = vm_mmap(file_priv->filp, 0, dma->byte_count,
1408 PROT_READ | PROT_WRITE,
1411 if (virtual > -1024UL) {
1413 retcode = (signed long)virtual;
1416 request->virtual = (void __user *)virtual;
1418 for (i = 0; i < dma->buf_count; i++) {
1419 if (copy_to_user(&request->list[i].idx,
1420 &dma->buflist[i]->idx,
1421 sizeof(request->list[0].idx))) {
1425 if (copy_to_user(&request->list[i].total,
1426 &dma->buflist[i]->total,
1427 sizeof(request->list[0].total))) {
1431 if (copy_to_user(&request->list[i].used,
1432 &zero, sizeof(zero))) {
1436 address = virtual + dma->buflist[i]->offset; /* *** */
1437 if (copy_to_user(&request->list[i].address,
1438 &address, sizeof(address))) {
1445 request->count = dma->buf_count;
1446 DRM_DEBUG("%d buffers, retcode = %d\n", request->count, retcode);
1451 int drm_dma_ioctl(struct drm_device *dev, void *data,
1452 struct drm_file *file_priv)
1454 if (drm_core_check_feature(dev, DRIVER_MODESET))
1457 if (dev->driver->dma_ioctl)
1458 return dev->driver->dma_ioctl(dev, data, file_priv);
1463 struct drm_local_map *drm_getsarea(struct drm_device *dev)
1465 struct drm_map_list *entry;
1467 list_for_each_entry(entry, &dev->maplist, head) {
1468 if (entry->map && entry->map->type == _DRM_SHM &&
1469 (entry->map->flags & _DRM_CONTAINS_LOCK)) {
1475 EXPORT_SYMBOL(drm_getsarea);