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>
39 unsigned long drm_get_resource_start(struct drm_device *dev, unsigned int resource)
41 return pci_resource_start(dev->pdev, resource);
43 EXPORT_SYMBOL(drm_get_resource_start);
45 unsigned long drm_get_resource_len(struct drm_device *dev, unsigned int resource)
47 return pci_resource_len(dev->pdev, resource);
50 EXPORT_SYMBOL(drm_get_resource_len);
52 static struct drm_map_list *drm_find_matching_map(struct drm_device *dev,
55 struct drm_map_list *entry;
56 list_for_each_entry(entry, &dev->maplist, head) {
57 if (entry->map && map->type == entry->map->type &&
58 ((entry->map->offset == map->offset) ||
59 (map->type == _DRM_SHM && map->flags==_DRM_CONTAINS_LOCK))) {
67 static int drm_map_handle(struct drm_device *dev, struct drm_hash_item *hash,
68 unsigned long user_token, int hashed_handle)
70 int use_hashed_handle;
71 #if (BITS_PER_LONG == 64)
72 use_hashed_handle = ((user_token & 0xFFFFFFFF00000000UL) || hashed_handle);
73 #elif (BITS_PER_LONG == 32)
74 use_hashed_handle = hashed_handle;
76 #error Unsupported long size. Neither 64 nor 32 bits.
79 if (!use_hashed_handle) {
81 hash->key = user_token >> PAGE_SHIFT;
82 ret = drm_ht_insert_item(&dev->map_hash, hash);
86 return drm_ht_just_insert_please(&dev->map_hash, hash,
87 user_token, 32 - PAGE_SHIFT - 3,
88 0, DRM_MAP_HASH_OFFSET >> PAGE_SHIFT);
92 * Ioctl to specify a range of memory that is available for mapping by a non-root process.
94 * \param inode device inode.
95 * \param filp file pointer.
97 * \param arg pointer to a drm_map structure.
98 * \return zero on success or a negative value on error.
100 * Adjusts the memory offset to its absolute value according to the mapping
101 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
102 * applicable and if supported by the kernel.
104 static int drm_addmap_core(struct drm_device * dev, unsigned int offset,
105 unsigned int size, enum drm_map_type type,
106 enum drm_map_flags flags,
107 struct drm_map_list ** maplist)
110 struct drm_map_list *list;
111 drm_dma_handle_t *dmah;
112 unsigned long user_token;
115 map = drm_alloc(sizeof(*map), DRM_MEM_MAPS);
119 map->offset = offset;
124 /* Only allow shared memory to be removable since we only keep enough
125 * book keeping information about shared memory to allow for removal
126 * when processes fork.
128 if ((map->flags & _DRM_REMOVABLE) && map->type != _DRM_SHM) {
129 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
132 DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
133 map->offset, map->size, map->type);
134 if ((map->offset & (~PAGE_MASK)) || (map->size & (~PAGE_MASK))) {
135 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
143 case _DRM_FRAME_BUFFER:
144 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
145 if (map->offset + (map->size-1) < map->offset ||
146 map->offset < virt_to_phys(high_memory)) {
147 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
152 map->offset += dev->hose->mem_space->start;
154 /* Some drivers preinitialize some maps, without the X Server
155 * needing to be aware of it. Therefore, we just return success
156 * when the server tries to create a duplicate map.
158 list = drm_find_matching_map(dev, map);
160 if (list->map->size != map->size) {
161 DRM_DEBUG("Matching maps of type %d with "
162 "mismatched sizes, (%ld vs %ld)\n",
163 map->type, map->size,
165 list->map->size = map->size;
168 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
173 if (drm_core_has_MTRR(dev)) {
174 if (map->type == _DRM_FRAME_BUFFER ||
175 (map->flags & _DRM_WRITE_COMBINING)) {
176 map->mtrr = mtrr_add(map->offset, map->size,
177 MTRR_TYPE_WRCOMB, 1);
180 if (map->type == _DRM_REGISTERS) {
181 map->handle = ioremap(map->offset, map->size);
183 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
190 list = drm_find_matching_map(dev, map);
192 if(list->map->size != map->size) {
193 DRM_DEBUG("Matching maps of type %d with "
194 "mismatched sizes, (%ld vs %ld)\n",
195 map->type, map->size, list->map->size);
196 list->map->size = map->size;
199 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
203 map->handle = vmalloc_user(map->size);
204 DRM_DEBUG("%lu %d %p\n",
205 map->size, drm_order(map->size), map->handle);
207 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
210 map->offset = (unsigned long)map->handle;
211 if (map->flags & _DRM_CONTAINS_LOCK) {
212 /* Prevent a 2nd X Server from creating a 2nd lock */
213 if (dev->lock.hw_lock != NULL) {
215 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
218 dev->sigdata.lock = dev->lock.hw_lock = map->handle; /* Pointer to lock */
222 struct drm_agp_mem *entry;
225 if (!drm_core_has_AGP(dev)) {
226 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
230 map->offset += dev->hose->mem_space->start;
232 /* Note: dev->agp->base may actually be 0 when the DRM
233 * is not in control of AGP space. But if user space is
234 * it should already have added the AGP base itself.
236 map->offset += dev->agp->base;
237 map->mtrr = dev->agp->agp_mtrr; /* for getmap */
239 /* This assumes the DRM is in total control of AGP space.
240 * It's not always the case as AGP can be in the control
241 * of user space (i.e. i810 driver). So this loop will get
242 * skipped and we double check that dev->agp->memory is
243 * actually set as well as being invalid before EPERM'ing
245 list_for_each_entry(entry, &dev->agp->memory, head) {
246 if ((map->offset >= entry->bound) &&
247 (map->offset + map->size <= entry->bound + entry->pages * PAGE_SIZE)) {
252 if (!list_empty(&dev->agp->memory) && !valid) {
253 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
256 DRM_DEBUG("AGP offset = 0x%08lx, size = 0x%08lx\n", map->offset, map->size);
260 case _DRM_SCATTER_GATHER:
262 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
265 map->offset += (unsigned long)dev->sg->virtual;
267 case _DRM_CONSISTENT:
268 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
269 * As we're limiting the address to 2^32-1 (or less),
270 * casting it down to 32 bits is no problem, but we
271 * need to point to a 64bit variable first. */
272 dmah = drm_pci_alloc(dev, map->size, map->size, 0xffffffffUL);
274 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
277 map->handle = dmah->vaddr;
278 map->offset = (unsigned long)dmah->busaddr;
282 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
286 list = drm_alloc(sizeof(*list), DRM_MEM_MAPS);
288 if (map->type == _DRM_REGISTERS)
289 iounmap(map->handle);
290 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
293 memset(list, 0, sizeof(*list));
296 mutex_lock(&dev->struct_mutex);
297 list_add(&list->head, &dev->maplist);
299 /* Assign a 32-bit handle */
300 /* We do it here so that dev->struct_mutex protects the increment */
301 user_token = (map->type == _DRM_SHM) ? (unsigned long)map->handle :
303 ret = drm_map_handle(dev, &list->hash, user_token, 0);
305 if (map->type == _DRM_REGISTERS)
306 iounmap(map->handle);
307 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
308 drm_free(list, sizeof(*list), DRM_MEM_MAPS);
309 mutex_unlock(&dev->struct_mutex);
313 list->user_token = list->hash.key << PAGE_SHIFT;
314 mutex_unlock(&dev->struct_mutex);
320 int drm_addmap(struct drm_device * dev, unsigned int offset,
321 unsigned int size, enum drm_map_type type,
322 enum drm_map_flags flags, drm_local_map_t ** map_ptr)
324 struct drm_map_list *list;
327 rc = drm_addmap_core(dev, offset, size, type, flags, &list);
329 *map_ptr = list->map;
333 EXPORT_SYMBOL(drm_addmap);
335 int drm_addmap_ioctl(struct inode *inode, struct file *filp,
336 unsigned int cmd, unsigned long arg)
338 struct drm_file *priv = filp->private_data;
339 struct drm_device *dev = priv->head->dev;
341 struct drm_map_list *maplist;
342 struct drm_map __user *argp = (void __user *)arg;
345 if (!(filp->f_mode & 3))
346 return -EACCES; /* Require read/write */
348 if (copy_from_user(&map, argp, sizeof(map))) {
352 if (!(capable(CAP_SYS_ADMIN) || map.type == _DRM_AGP))
355 err = drm_addmap_core(dev, map.offset, map.size, map.type, map.flags,
361 if (copy_to_user(argp, maplist->map, sizeof(struct drm_map)))
364 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
365 if (put_user((void *)(unsigned long)maplist->user_token, &argp->handle))
371 * Remove a map private from list and deallocate resources if the mapping
374 * \param inode device inode.
375 * \param filp file pointer.
376 * \param cmd command.
377 * \param arg pointer to a struct drm_map structure.
378 * \return zero on success or a negative value on error.
380 * Searches the map on drm_device::maplist, removes it from the list, see if
381 * its being used, and free any associate resource (such as MTRR's) if it's not
386 int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
388 struct drm_map_list *r_list = NULL, *list_t;
389 drm_dma_handle_t dmah;
392 /* Find the list entry for the map and remove it */
393 list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
394 if (r_list->map == map) {
395 list_del(&r_list->head);
396 drm_ht_remove_key(&dev->map_hash,
397 r_list->user_token >> PAGE_SHIFT);
398 drm_free(r_list, sizeof(*r_list), DRM_MEM_MAPS);
409 iounmap(map->handle);
411 case _DRM_FRAME_BUFFER:
412 if (drm_core_has_MTRR(dev) && map->mtrr >= 0) {
414 retcode = mtrr_del(map->mtrr, map->offset, map->size);
415 DRM_DEBUG("mtrr_del=%d\n", retcode);
422 case _DRM_SCATTER_GATHER:
424 case _DRM_CONSISTENT:
425 dmah.vaddr = map->handle;
426 dmah.busaddr = map->offset;
427 dmah.size = map->size;
428 __drm_pci_free(dev, &dmah);
431 drm_free(map, sizeof(*map), DRM_MEM_MAPS);
436 int drm_rmmap(struct drm_device *dev, drm_local_map_t *map)
440 mutex_lock(&dev->struct_mutex);
441 ret = drm_rmmap_locked(dev, map);
442 mutex_unlock(&dev->struct_mutex);
447 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
448 * the last close of the device, and this is necessary for cleanup when things
449 * exit uncleanly. Therefore, having userland manually remove mappings seems
450 * like a pointless exercise since they're going away anyway.
452 * One use case might be after addmap is allowed for normal users for SHM and
453 * gets used by drivers that the server doesn't need to care about. This seems
456 int drm_rmmap_ioctl(struct inode *inode, struct file *filp,
457 unsigned int cmd, unsigned long arg)
459 struct drm_file *priv = filp->private_data;
460 struct drm_device *dev = priv->head->dev;
461 struct drm_map request;
462 drm_local_map_t *map = NULL;
463 struct drm_map_list *r_list;
466 if (copy_from_user(&request, (struct drm_map __user *) arg, sizeof(request))) {
470 mutex_lock(&dev->struct_mutex);
471 list_for_each_entry(r_list, &dev->maplist, head) {
473 r_list->user_token == (unsigned long)request.handle &&
474 r_list->map->flags & _DRM_REMOVABLE) {
480 /* List has wrapped around to the head pointer, or its empty we didn't
483 if (list_empty(&dev->maplist) || !map) {
484 mutex_unlock(&dev->struct_mutex);
488 /* Register and framebuffer maps are permanent */
489 if ((map->type == _DRM_REGISTERS) || (map->type == _DRM_FRAME_BUFFER)) {
490 mutex_unlock(&dev->struct_mutex);
494 ret = drm_rmmap_locked(dev, map);
496 mutex_unlock(&dev->struct_mutex);
502 * Cleanup after an error on one of the addbufs() functions.
504 * \param dev DRM device.
505 * \param entry buffer entry where the error occurred.
507 * Frees any pages and buffers associated with the given entry.
509 static void drm_cleanup_buf_error(struct drm_device * dev,
510 struct drm_buf_entry * entry)
514 if (entry->seg_count) {
515 for (i = 0; i < entry->seg_count; i++) {
516 if (entry->seglist[i]) {
517 drm_pci_free(dev, entry->seglist[i]);
520 drm_free(entry->seglist,
522 sizeof(*entry->seglist), DRM_MEM_SEGS);
524 entry->seg_count = 0;
527 if (entry->buf_count) {
528 for (i = 0; i < entry->buf_count; i++) {
529 if (entry->buflist[i].dev_private) {
530 drm_free(entry->buflist[i].dev_private,
531 entry->buflist[i].dev_priv_size,
535 drm_free(entry->buflist,
537 sizeof(*entry->buflist), DRM_MEM_BUFS);
539 entry->buf_count = 0;
545 * Add AGP buffers for DMA transfers.
547 * \param dev struct drm_device to which the buffers are to be added.
548 * \param request pointer to a struct drm_buf_desc describing the request.
549 * \return zero on success or a negative number on failure.
551 * After some sanity checks creates a drm_buf structure for each buffer and
552 * reallocates the buffer list of the same size order to accommodate the new
555 int drm_addbufs_agp(struct drm_device * dev, struct drm_buf_desc * request)
557 struct drm_device_dma *dma = dev->dma;
558 struct drm_buf_entry *entry;
559 struct drm_agp_mem *agp_entry;
561 unsigned long offset;
562 unsigned long agp_offset;
571 struct drm_buf **temp_buflist;
576 count = request->count;
577 order = drm_order(request->size);
580 alignment = (request->flags & _DRM_PAGE_ALIGN)
581 ? PAGE_ALIGN(size) : size;
582 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
583 total = PAGE_SIZE << page_order;
586 agp_offset = dev->agp->base + request->agp_start;
588 DRM_DEBUG("count: %d\n", count);
589 DRM_DEBUG("order: %d\n", order);
590 DRM_DEBUG("size: %d\n", size);
591 DRM_DEBUG("agp_offset: %lx\n", agp_offset);
592 DRM_DEBUG("alignment: %d\n", alignment);
593 DRM_DEBUG("page_order: %d\n", page_order);
594 DRM_DEBUG("total: %d\n", total);
596 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
598 if (dev->queue_count)
599 return -EBUSY; /* Not while in use */
601 /* Make sure buffers are located in AGP memory that we own */
603 list_for_each_entry(agp_entry, &dev->agp->memory, head) {
604 if ((agp_offset >= agp_entry->bound) &&
605 (agp_offset + total * count <= agp_entry->bound + agp_entry->pages * PAGE_SIZE)) {
610 if (!list_empty(&dev->agp->memory) && !valid) {
611 DRM_DEBUG("zone invalid\n");
614 spin_lock(&dev->count_lock);
616 spin_unlock(&dev->count_lock);
619 atomic_inc(&dev->buf_alloc);
620 spin_unlock(&dev->count_lock);
622 mutex_lock(&dev->struct_mutex);
623 entry = &dma->bufs[order];
624 if (entry->buf_count) {
625 mutex_unlock(&dev->struct_mutex);
626 atomic_dec(&dev->buf_alloc);
627 return -ENOMEM; /* May only call once for each order */
630 if (count < 0 || count > 4096) {
631 mutex_unlock(&dev->struct_mutex);
632 atomic_dec(&dev->buf_alloc);
636 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
638 if (!entry->buflist) {
639 mutex_unlock(&dev->struct_mutex);
640 atomic_dec(&dev->buf_alloc);
643 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
645 entry->buf_size = size;
646 entry->page_order = page_order;
650 while (entry->buf_count < count) {
651 buf = &entry->buflist[entry->buf_count];
652 buf->idx = dma->buf_count + entry->buf_count;
653 buf->total = alignment;
657 buf->offset = (dma->byte_count + offset);
658 buf->bus_address = agp_offset + offset;
659 buf->address = (void *)(agp_offset + offset);
663 init_waitqueue_head(&buf->dma_wait);
666 buf->dev_priv_size = dev->driver->dev_priv_size;
667 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
668 if (!buf->dev_private) {
669 /* Set count correctly so we free the proper amount. */
670 entry->buf_count = count;
671 drm_cleanup_buf_error(dev, entry);
672 mutex_unlock(&dev->struct_mutex);
673 atomic_dec(&dev->buf_alloc);
676 memset(buf->dev_private, 0, buf->dev_priv_size);
678 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
682 byte_count += PAGE_SIZE << page_order;
685 DRM_DEBUG("byte_count: %d\n", byte_count);
687 temp_buflist = drm_realloc(dma->buflist,
688 dma->buf_count * sizeof(*dma->buflist),
689 (dma->buf_count + entry->buf_count)
690 * sizeof(*dma->buflist), DRM_MEM_BUFS);
692 /* Free the entry because it isn't valid */
693 drm_cleanup_buf_error(dev, entry);
694 mutex_unlock(&dev->struct_mutex);
695 atomic_dec(&dev->buf_alloc);
698 dma->buflist = temp_buflist;
700 for (i = 0; i < entry->buf_count; i++) {
701 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
704 dma->buf_count += entry->buf_count;
705 dma->seg_count += entry->seg_count;
706 dma->page_count += byte_count >> PAGE_SHIFT;
707 dma->byte_count += byte_count;
709 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
710 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
712 mutex_unlock(&dev->struct_mutex);
714 request->count = entry->buf_count;
715 request->size = size;
717 dma->flags = _DRM_DMA_USE_AGP;
719 atomic_dec(&dev->buf_alloc);
722 EXPORT_SYMBOL(drm_addbufs_agp);
723 #endif /* __OS_HAS_AGP */
725 int drm_addbufs_pci(struct drm_device * dev, struct drm_buf_desc * request)
727 struct drm_device_dma *dma = dev->dma;
733 struct drm_buf_entry *entry;
734 drm_dma_handle_t *dmah;
737 unsigned long offset;
741 unsigned long *temp_pagelist;
742 struct drm_buf **temp_buflist;
744 if (!drm_core_check_feature(dev, DRIVER_PCI_DMA))
750 if (!capable(CAP_SYS_ADMIN))
753 count = request->count;
754 order = drm_order(request->size);
757 DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
758 request->count, request->size, size, order, dev->queue_count);
760 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
762 if (dev->queue_count)
763 return -EBUSY; /* Not while in use */
765 alignment = (request->flags & _DRM_PAGE_ALIGN)
766 ? PAGE_ALIGN(size) : size;
767 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
768 total = PAGE_SIZE << page_order;
770 spin_lock(&dev->count_lock);
772 spin_unlock(&dev->count_lock);
775 atomic_inc(&dev->buf_alloc);
776 spin_unlock(&dev->count_lock);
778 mutex_lock(&dev->struct_mutex);
779 entry = &dma->bufs[order];
780 if (entry->buf_count) {
781 mutex_unlock(&dev->struct_mutex);
782 atomic_dec(&dev->buf_alloc);
783 return -ENOMEM; /* May only call once for each order */
786 if (count < 0 || count > 4096) {
787 mutex_unlock(&dev->struct_mutex);
788 atomic_dec(&dev->buf_alloc);
792 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
794 if (!entry->buflist) {
795 mutex_unlock(&dev->struct_mutex);
796 atomic_dec(&dev->buf_alloc);
799 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
801 entry->seglist = drm_alloc(count * sizeof(*entry->seglist),
803 if (!entry->seglist) {
804 drm_free(entry->buflist,
805 count * sizeof(*entry->buflist), DRM_MEM_BUFS);
806 mutex_unlock(&dev->struct_mutex);
807 atomic_dec(&dev->buf_alloc);
810 memset(entry->seglist, 0, count * sizeof(*entry->seglist));
812 /* Keep the original pagelist until we know all the allocations
815 temp_pagelist = drm_alloc((dma->page_count + (count << page_order))
816 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
817 if (!temp_pagelist) {
818 drm_free(entry->buflist,
819 count * sizeof(*entry->buflist), DRM_MEM_BUFS);
820 drm_free(entry->seglist,
821 count * sizeof(*entry->seglist), DRM_MEM_SEGS);
822 mutex_unlock(&dev->struct_mutex);
823 atomic_dec(&dev->buf_alloc);
826 memcpy(temp_pagelist,
827 dma->pagelist, dma->page_count * sizeof(*dma->pagelist));
828 DRM_DEBUG("pagelist: %d entries\n",
829 dma->page_count + (count << page_order));
831 entry->buf_size = size;
832 entry->page_order = page_order;
836 while (entry->buf_count < count) {
838 dmah = drm_pci_alloc(dev, PAGE_SIZE << page_order, 0x1000, 0xfffffffful);
841 /* Set count correctly so we free the proper amount. */
842 entry->buf_count = count;
843 entry->seg_count = count;
844 drm_cleanup_buf_error(dev, entry);
845 drm_free(temp_pagelist,
846 (dma->page_count + (count << page_order))
847 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
848 mutex_unlock(&dev->struct_mutex);
849 atomic_dec(&dev->buf_alloc);
852 entry->seglist[entry->seg_count++] = dmah;
853 for (i = 0; i < (1 << page_order); i++) {
854 DRM_DEBUG("page %d @ 0x%08lx\n",
855 dma->page_count + page_count,
856 (unsigned long)dmah->vaddr + PAGE_SIZE * i);
857 temp_pagelist[dma->page_count + page_count++]
858 = (unsigned long)dmah->vaddr + PAGE_SIZE * i;
861 offset + size <= total && entry->buf_count < count;
862 offset += alignment, ++entry->buf_count) {
863 buf = &entry->buflist[entry->buf_count];
864 buf->idx = dma->buf_count + entry->buf_count;
865 buf->total = alignment;
868 buf->offset = (dma->byte_count + byte_count + offset);
869 buf->address = (void *)(dmah->vaddr + offset);
870 buf->bus_address = dmah->busaddr + offset;
874 init_waitqueue_head(&buf->dma_wait);
877 buf->dev_priv_size = dev->driver->dev_priv_size;
878 buf->dev_private = drm_alloc(buf->dev_priv_size,
880 if (!buf->dev_private) {
881 /* Set count correctly so we free the proper amount. */
882 entry->buf_count = count;
883 entry->seg_count = count;
884 drm_cleanup_buf_error(dev, entry);
885 drm_free(temp_pagelist,
887 (count << page_order))
888 * sizeof(*dma->pagelist),
890 mutex_unlock(&dev->struct_mutex);
891 atomic_dec(&dev->buf_alloc);
894 memset(buf->dev_private, 0, buf->dev_priv_size);
896 DRM_DEBUG("buffer %d @ %p\n",
897 entry->buf_count, buf->address);
899 byte_count += PAGE_SIZE << page_order;
902 temp_buflist = drm_realloc(dma->buflist,
903 dma->buf_count * sizeof(*dma->buflist),
904 (dma->buf_count + entry->buf_count)
905 * sizeof(*dma->buflist), DRM_MEM_BUFS);
907 /* Free the entry because it isn't valid */
908 drm_cleanup_buf_error(dev, entry);
909 drm_free(temp_pagelist,
910 (dma->page_count + (count << page_order))
911 * sizeof(*dma->pagelist), DRM_MEM_PAGES);
912 mutex_unlock(&dev->struct_mutex);
913 atomic_dec(&dev->buf_alloc);
916 dma->buflist = temp_buflist;
918 for (i = 0; i < entry->buf_count; i++) {
919 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
922 /* No allocations failed, so now we can replace the orginal pagelist
925 if (dma->page_count) {
926 drm_free(dma->pagelist,
927 dma->page_count * sizeof(*dma->pagelist),
930 dma->pagelist = temp_pagelist;
932 dma->buf_count += entry->buf_count;
933 dma->seg_count += entry->seg_count;
934 dma->page_count += entry->seg_count << page_order;
935 dma->byte_count += PAGE_SIZE * (entry->seg_count << page_order);
937 mutex_unlock(&dev->struct_mutex);
939 request->count = entry->buf_count;
940 request->size = size;
942 if (request->flags & _DRM_PCI_BUFFER_RO)
943 dma->flags = _DRM_DMA_USE_PCI_RO;
945 atomic_dec(&dev->buf_alloc);
949 EXPORT_SYMBOL(drm_addbufs_pci);
951 static int drm_addbufs_sg(struct drm_device * dev, struct drm_buf_desc * request)
953 struct drm_device_dma *dma = dev->dma;
954 struct drm_buf_entry *entry;
956 unsigned long offset;
957 unsigned long agp_offset;
966 struct drm_buf **temp_buflist;
968 if (!drm_core_check_feature(dev, DRIVER_SG))
974 if (!capable(CAP_SYS_ADMIN))
977 count = request->count;
978 order = drm_order(request->size);
981 alignment = (request->flags & _DRM_PAGE_ALIGN)
982 ? PAGE_ALIGN(size) : size;
983 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
984 total = PAGE_SIZE << page_order;
987 agp_offset = request->agp_start;
989 DRM_DEBUG("count: %d\n", count);
990 DRM_DEBUG("order: %d\n", order);
991 DRM_DEBUG("size: %d\n", size);
992 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
993 DRM_DEBUG("alignment: %d\n", alignment);
994 DRM_DEBUG("page_order: %d\n", page_order);
995 DRM_DEBUG("total: %d\n", total);
997 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
999 if (dev->queue_count)
1000 return -EBUSY; /* Not while in use */
1002 spin_lock(&dev->count_lock);
1004 spin_unlock(&dev->count_lock);
1007 atomic_inc(&dev->buf_alloc);
1008 spin_unlock(&dev->count_lock);
1010 mutex_lock(&dev->struct_mutex);
1011 entry = &dma->bufs[order];
1012 if (entry->buf_count) {
1013 mutex_unlock(&dev->struct_mutex);
1014 atomic_dec(&dev->buf_alloc);
1015 return -ENOMEM; /* May only call once for each order */
1018 if (count < 0 || count > 4096) {
1019 mutex_unlock(&dev->struct_mutex);
1020 atomic_dec(&dev->buf_alloc);
1024 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1026 if (!entry->buflist) {
1027 mutex_unlock(&dev->struct_mutex);
1028 atomic_dec(&dev->buf_alloc);
1031 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1033 entry->buf_size = size;
1034 entry->page_order = page_order;
1038 while (entry->buf_count < count) {
1039 buf = &entry->buflist[entry->buf_count];
1040 buf->idx = dma->buf_count + entry->buf_count;
1041 buf->total = alignment;
1045 buf->offset = (dma->byte_count + offset);
1046 buf->bus_address = agp_offset + offset;
1047 buf->address = (void *)(agp_offset + offset
1048 + (unsigned long)dev->sg->virtual);
1052 init_waitqueue_head(&buf->dma_wait);
1055 buf->dev_priv_size = dev->driver->dev_priv_size;
1056 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1057 if (!buf->dev_private) {
1058 /* Set count correctly so we free the proper amount. */
1059 entry->buf_count = count;
1060 drm_cleanup_buf_error(dev, entry);
1061 mutex_unlock(&dev->struct_mutex);
1062 atomic_dec(&dev->buf_alloc);
1066 memset(buf->dev_private, 0, buf->dev_priv_size);
1068 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1070 offset += alignment;
1072 byte_count += PAGE_SIZE << page_order;
1075 DRM_DEBUG("byte_count: %d\n", byte_count);
1077 temp_buflist = drm_realloc(dma->buflist,
1078 dma->buf_count * sizeof(*dma->buflist),
1079 (dma->buf_count + entry->buf_count)
1080 * sizeof(*dma->buflist), DRM_MEM_BUFS);
1081 if (!temp_buflist) {
1082 /* Free the entry because it isn't valid */
1083 drm_cleanup_buf_error(dev, entry);
1084 mutex_unlock(&dev->struct_mutex);
1085 atomic_dec(&dev->buf_alloc);
1088 dma->buflist = temp_buflist;
1090 for (i = 0; i < entry->buf_count; i++) {
1091 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1094 dma->buf_count += entry->buf_count;
1095 dma->seg_count += entry->seg_count;
1096 dma->page_count += byte_count >> PAGE_SHIFT;
1097 dma->byte_count += byte_count;
1099 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1100 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1102 mutex_unlock(&dev->struct_mutex);
1104 request->count = entry->buf_count;
1105 request->size = size;
1107 dma->flags = _DRM_DMA_USE_SG;
1109 atomic_dec(&dev->buf_alloc);
1113 static int drm_addbufs_fb(struct drm_device * dev, struct drm_buf_desc * request)
1115 struct drm_device_dma *dma = dev->dma;
1116 struct drm_buf_entry *entry;
1117 struct drm_buf *buf;
1118 unsigned long offset;
1119 unsigned long agp_offset;
1128 struct drm_buf **temp_buflist;
1130 if (!drm_core_check_feature(dev, DRIVER_FB_DMA))
1136 if (!capable(CAP_SYS_ADMIN))
1139 count = request->count;
1140 order = drm_order(request->size);
1143 alignment = (request->flags & _DRM_PAGE_ALIGN)
1144 ? PAGE_ALIGN(size) : size;
1145 page_order = order - PAGE_SHIFT > 0 ? order - PAGE_SHIFT : 0;
1146 total = PAGE_SIZE << page_order;
1149 agp_offset = request->agp_start;
1151 DRM_DEBUG("count: %d\n", count);
1152 DRM_DEBUG("order: %d\n", order);
1153 DRM_DEBUG("size: %d\n", size);
1154 DRM_DEBUG("agp_offset: %lu\n", agp_offset);
1155 DRM_DEBUG("alignment: %d\n", alignment);
1156 DRM_DEBUG("page_order: %d\n", page_order);
1157 DRM_DEBUG("total: %d\n", total);
1159 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1161 if (dev->queue_count)
1162 return -EBUSY; /* Not while in use */
1164 spin_lock(&dev->count_lock);
1166 spin_unlock(&dev->count_lock);
1169 atomic_inc(&dev->buf_alloc);
1170 spin_unlock(&dev->count_lock);
1172 mutex_lock(&dev->struct_mutex);
1173 entry = &dma->bufs[order];
1174 if (entry->buf_count) {
1175 mutex_unlock(&dev->struct_mutex);
1176 atomic_dec(&dev->buf_alloc);
1177 return -ENOMEM; /* May only call once for each order */
1180 if (count < 0 || count > 4096) {
1181 mutex_unlock(&dev->struct_mutex);
1182 atomic_dec(&dev->buf_alloc);
1186 entry->buflist = drm_alloc(count * sizeof(*entry->buflist),
1188 if (!entry->buflist) {
1189 mutex_unlock(&dev->struct_mutex);
1190 atomic_dec(&dev->buf_alloc);
1193 memset(entry->buflist, 0, count * sizeof(*entry->buflist));
1195 entry->buf_size = size;
1196 entry->page_order = page_order;
1200 while (entry->buf_count < count) {
1201 buf = &entry->buflist[entry->buf_count];
1202 buf->idx = dma->buf_count + entry->buf_count;
1203 buf->total = alignment;
1207 buf->offset = (dma->byte_count + offset);
1208 buf->bus_address = agp_offset + offset;
1209 buf->address = (void *)(agp_offset + offset);
1213 init_waitqueue_head(&buf->dma_wait);
1216 buf->dev_priv_size = dev->driver->dev_priv_size;
1217 buf->dev_private = drm_alloc(buf->dev_priv_size, DRM_MEM_BUFS);
1218 if (!buf->dev_private) {
1219 /* Set count correctly so we free the proper amount. */
1220 entry->buf_count = count;
1221 drm_cleanup_buf_error(dev, entry);
1222 mutex_unlock(&dev->struct_mutex);
1223 atomic_dec(&dev->buf_alloc);
1226 memset(buf->dev_private, 0, buf->dev_priv_size);
1228 DRM_DEBUG("buffer %d @ %p\n", entry->buf_count, buf->address);
1230 offset += alignment;
1232 byte_count += PAGE_SIZE << page_order;
1235 DRM_DEBUG("byte_count: %d\n", byte_count);
1237 temp_buflist = drm_realloc(dma->buflist,
1238 dma->buf_count * sizeof(*dma->buflist),
1239 (dma->buf_count + entry->buf_count)
1240 * sizeof(*dma->buflist), DRM_MEM_BUFS);
1241 if (!temp_buflist) {
1242 /* Free the entry because it isn't valid */
1243 drm_cleanup_buf_error(dev, entry);
1244 mutex_unlock(&dev->struct_mutex);
1245 atomic_dec(&dev->buf_alloc);
1248 dma->buflist = temp_buflist;
1250 for (i = 0; i < entry->buf_count; i++) {
1251 dma->buflist[i + dma->buf_count] = &entry->buflist[i];
1254 dma->buf_count += entry->buf_count;
1255 dma->seg_count += entry->seg_count;
1256 dma->page_count += byte_count >> PAGE_SHIFT;
1257 dma->byte_count += byte_count;
1259 DRM_DEBUG("dma->buf_count : %d\n", dma->buf_count);
1260 DRM_DEBUG("entry->buf_count : %d\n", entry->buf_count);
1262 mutex_unlock(&dev->struct_mutex);
1264 request->count = entry->buf_count;
1265 request->size = size;
1267 dma->flags = _DRM_DMA_USE_FB;
1269 atomic_dec(&dev->buf_alloc);
1275 * Add buffers for DMA transfers (ioctl).
1277 * \param inode device inode.
1278 * \param filp file pointer.
1279 * \param cmd command.
1280 * \param arg pointer to a struct drm_buf_desc request.
1281 * \return zero on success or a negative number on failure.
1283 * According with the memory type specified in drm_buf_desc::flags and the
1284 * build options, it dispatches the call either to addbufs_agp(),
1285 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1286 * PCI memory respectively.
1288 int drm_addbufs(struct inode *inode, struct file *filp,
1289 unsigned int cmd, unsigned long arg)
1291 struct drm_buf_desc request;
1292 struct drm_file *priv = filp->private_data;
1293 struct drm_device *dev = priv->head->dev;
1296 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1299 if (copy_from_user(&request, (struct drm_buf_desc __user *) arg,
1304 if (request.flags & _DRM_AGP_BUFFER)
1305 ret = drm_addbufs_agp(dev, &request);
1308 if (request.flags & _DRM_SG_BUFFER)
1309 ret = drm_addbufs_sg(dev, &request);
1310 else if (request.flags & _DRM_FB_BUFFER)
1311 ret = drm_addbufs_fb(dev, &request);
1313 ret = drm_addbufs_pci(dev, &request);
1316 if (copy_to_user((void __user *)arg, &request, sizeof(request))) {
1324 * Get information about the buffer mappings.
1326 * This was originally mean for debugging purposes, or by a sophisticated
1327 * client library to determine how best to use the available buffers (e.g.,
1328 * large buffers can be used for image transfer).
1330 * \param inode device inode.
1331 * \param filp file pointer.
1332 * \param cmd command.
1333 * \param arg pointer to a drm_buf_info structure.
1334 * \return zero on success or a negative number on failure.
1336 * Increments drm_device::buf_use while holding the drm_device::count_lock
1337 * lock, preventing of allocating more buffers after this call. Information
1338 * about each requested buffer is then copied into user space.
1340 int drm_infobufs(struct inode *inode, struct file *filp,
1341 unsigned int cmd, unsigned long arg)
1343 struct drm_file *priv = filp->private_data;
1344 struct drm_device *dev = priv->head->dev;
1345 struct drm_device_dma *dma = dev->dma;
1346 struct drm_buf_info request;
1347 struct drm_buf_info __user *argp = (void __user *)arg;
1351 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1357 spin_lock(&dev->count_lock);
1358 if (atomic_read(&dev->buf_alloc)) {
1359 spin_unlock(&dev->count_lock);
1362 ++dev->buf_use; /* Can't allocate more after this call */
1363 spin_unlock(&dev->count_lock);
1365 if (copy_from_user(&request, argp, sizeof(request)))
1368 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1369 if (dma->bufs[i].buf_count)
1373 DRM_DEBUG("count = %d\n", count);
1375 if (request.count >= count) {
1376 for (i = 0, count = 0; i < DRM_MAX_ORDER + 1; i++) {
1377 if (dma->bufs[i].buf_count) {
1378 struct drm_buf_desc __user *to =
1379 &request.list[count];
1380 struct drm_buf_entry *from = &dma->bufs[i];
1381 struct drm_freelist *list = &dma->bufs[i].freelist;
1382 if (copy_to_user(&to->count,
1384 sizeof(from->buf_count)) ||
1385 copy_to_user(&to->size,
1387 sizeof(from->buf_size)) ||
1388 copy_to_user(&to->low_mark,
1390 sizeof(list->low_mark)) ||
1391 copy_to_user(&to->high_mark,
1393 sizeof(list->high_mark)))
1396 DRM_DEBUG("%d %d %d %d %d\n",
1398 dma->bufs[i].buf_count,
1399 dma->bufs[i].buf_size,
1400 dma->bufs[i].freelist.low_mark,
1401 dma->bufs[i].freelist.high_mark);
1406 request.count = count;
1408 if (copy_to_user(argp, &request, sizeof(request)))
1415 * Specifies a low and high water mark for buffer allocation
1417 * \param inode device inode.
1418 * \param filp file pointer.
1419 * \param cmd command.
1420 * \param arg a pointer to a drm_buf_desc structure.
1421 * \return zero on success or a negative number on failure.
1423 * Verifies that the size order is bounded between the admissible orders and
1424 * updates the respective drm_device_dma::bufs entry low and high water mark.
1426 * \note This ioctl is deprecated and mostly never used.
1428 int drm_markbufs(struct inode *inode, struct file *filp,
1429 unsigned int cmd, unsigned long arg)
1431 struct drm_file *priv = filp->private_data;
1432 struct drm_device *dev = priv->head->dev;
1433 struct drm_device_dma *dma = dev->dma;
1434 struct drm_buf_desc request;
1436 struct drm_buf_entry *entry;
1438 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1444 if (copy_from_user(&request,
1445 (struct drm_buf_desc __user *) arg, sizeof(request)))
1448 DRM_DEBUG("%d, %d, %d\n",
1449 request.size, request.low_mark, request.high_mark);
1450 order = drm_order(request.size);
1451 if (order < DRM_MIN_ORDER || order > DRM_MAX_ORDER)
1453 entry = &dma->bufs[order];
1455 if (request.low_mark < 0 || request.low_mark > entry->buf_count)
1457 if (request.high_mark < 0 || request.high_mark > entry->buf_count)
1460 entry->freelist.low_mark = request.low_mark;
1461 entry->freelist.high_mark = request.high_mark;
1467 * Unreserve the buffers in list, previously reserved using drmDMA.
1469 * \param inode device inode.
1470 * \param filp file pointer.
1471 * \param cmd command.
1472 * \param arg pointer to a drm_buf_free structure.
1473 * \return zero on success or a negative number on failure.
1475 * Calls free_buffer() for each used buffer.
1476 * This function is primarily used for debugging.
1478 int drm_freebufs(struct inode *inode, struct file *filp,
1479 unsigned int cmd, unsigned long arg)
1481 struct drm_file *priv = filp->private_data;
1482 struct drm_device *dev = priv->head->dev;
1483 struct drm_device_dma *dma = dev->dma;
1484 struct drm_buf_free request;
1487 struct drm_buf *buf;
1489 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1495 if (copy_from_user(&request,
1496 (struct drm_buf_free __user *) arg, sizeof(request)))
1499 DRM_DEBUG("%d\n", request.count);
1500 for (i = 0; i < request.count; i++) {
1501 if (copy_from_user(&idx, &request.list[i], sizeof(idx)))
1503 if (idx < 0 || idx >= dma->buf_count) {
1504 DRM_ERROR("Index %d (of %d max)\n",
1505 idx, dma->buf_count - 1);
1508 buf = dma->buflist[idx];
1509 if (buf->filp != filp) {
1510 DRM_ERROR("Process %d freeing buffer not owned\n",
1514 drm_free_buffer(dev, buf);
1521 * Maps all of the DMA buffers into client-virtual space (ioctl).
1523 * \param inode device inode.
1524 * \param filp file pointer.
1525 * \param cmd command.
1526 * \param arg pointer to a drm_buf_map structure.
1527 * \return zero on success or a negative number on failure.
1529 * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1530 * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1531 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1534 int drm_mapbufs(struct inode *inode, struct file *filp,
1535 unsigned int cmd, unsigned long arg)
1537 struct drm_file *priv = filp->private_data;
1538 struct drm_device *dev = priv->head->dev;
1539 struct drm_device_dma *dma = dev->dma;
1540 struct drm_buf_map __user *argp = (void __user *)arg;
1543 unsigned long virtual;
1544 unsigned long address;
1545 struct drm_buf_map request;
1548 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA))
1554 spin_lock(&dev->count_lock);
1555 if (atomic_read(&dev->buf_alloc)) {
1556 spin_unlock(&dev->count_lock);
1559 dev->buf_use++; /* Can't allocate more after this call */
1560 spin_unlock(&dev->count_lock);
1562 if (copy_from_user(&request, argp, sizeof(request)))
1565 if (request.count >= dma->buf_count) {
1566 if ((drm_core_has_AGP(dev) && (dma->flags & _DRM_DMA_USE_AGP))
1567 || (drm_core_check_feature(dev, DRIVER_SG)
1568 && (dma->flags & _DRM_DMA_USE_SG))
1569 || (drm_core_check_feature(dev, DRIVER_FB_DMA)
1570 && (dma->flags & _DRM_DMA_USE_FB))) {
1571 struct drm_map *map = dev->agp_buffer_map;
1572 unsigned long token = dev->agp_buffer_token;
1579 down_write(¤t->mm->mmap_sem);
1580 virtual = do_mmap(filp, 0, map->size,
1581 PROT_READ | PROT_WRITE,
1583 up_write(¤t->mm->mmap_sem);
1585 down_write(¤t->mm->mmap_sem);
1586 virtual = do_mmap(filp, 0, dma->byte_count,
1587 PROT_READ | PROT_WRITE,
1589 up_write(¤t->mm->mmap_sem);
1591 if (virtual > -1024UL) {
1593 retcode = (signed long)virtual;
1596 request.virtual = (void __user *)virtual;
1598 for (i = 0; i < dma->buf_count; i++) {
1599 if (copy_to_user(&request.list[i].idx,
1600 &dma->buflist[i]->idx,
1601 sizeof(request.list[0].idx))) {
1605 if (copy_to_user(&request.list[i].total,
1606 &dma->buflist[i]->total,
1607 sizeof(request.list[0].total))) {
1611 if (copy_to_user(&request.list[i].used,
1612 &zero, sizeof(zero))) {
1616 address = virtual + dma->buflist[i]->offset; /* *** */
1617 if (copy_to_user(&request.list[i].address,
1618 &address, sizeof(address))) {
1625 request.count = dma->buf_count;
1626 DRM_DEBUG("%d buffers, retcode = %d\n", request.count, retcode);
1628 if (copy_to_user(argp, &request, sizeof(request)))
1635 * Compute size order. Returns the exponent of the smaller power of two which
1636 * is greater or equal to given number.
1641 * \todo Can be made faster.
1643 int drm_order(unsigned long size)
1648 for (order = 0, tmp = size >> 1; tmp; tmp >>= 1, order++) ;
1650 if (size & (size - 1))
1655 EXPORT_SYMBOL(drm_order);