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(drm_device_t
* dev
, unsigned int resource
)
41 return pci_resource_start(dev
->pdev
, resource
);
44 EXPORT_SYMBOL(drm_get_resource_start
);
46 unsigned long drm_get_resource_len(drm_device_t
* dev
, unsigned int resource
)
48 return pci_resource_len(dev
->pdev
, resource
);
51 EXPORT_SYMBOL(drm_get_resource_len
);
53 static drm_map_list_t
*drm_find_matching_map(drm_device_t
* dev
,
54 drm_local_map_t
* map
)
56 struct list_head
*list
;
58 list_for_each(list
, &dev
->maplist
->head
) {
59 drm_map_list_t
*entry
= list_entry(list
, drm_map_list_t
, head
);
60 if (entry
->map
&& map
->type
== entry
->map
->type
&&
61 entry
->map
->offset
== map
->offset
) {
70 * Used to allocate 32-bit handles for mappings.
72 #define START_RANGE 0x10000000
73 #define END_RANGE 0x40000000
76 static __inline__
unsigned int HandleID(unsigned long lhandle
,
79 static unsigned int map32_handle
= START_RANGE
;
82 if (lhandle
& 0xffffffff00000000) {
84 map32_handle
+= PAGE_SIZE
;
85 if (map32_handle
> END_RANGE
)
86 map32_handle
= START_RANGE
;
91 drm_map_list_t
*_entry
;
92 list_for_each_entry(_entry
, &dev
->maplist
->head
, head
) {
93 if (_entry
->user_token
== hash
)
96 if (&_entry
->head
== &dev
->maplist
->head
)
100 map32_handle
+= PAGE_SIZE
;
104 # define HandleID(x,dev) (unsigned int)(x)
108 * Ioctl to specify a range of memory that is available for mapping by a non-root process.
110 * \param inode device inode.
111 * \param filp file pointer.
112 * \param cmd command.
113 * \param arg pointer to a drm_map structure.
114 * \return zero on success or a negative value on error.
116 * Adjusts the memory offset to its absolute value according to the mapping
117 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
118 * applicable and if supported by the kernel.
120 static int drm_addmap_core(drm_device_t
* dev
, unsigned int offset
,
121 unsigned int size
, drm_map_type_t type
,
122 drm_map_flags_t flags
, drm_map_list_t
** maplist
)
125 drm_map_list_t
*list
;
126 drm_dma_handle_t
*dmah
;
128 map
= drm_alloc(sizeof(*map
), DRM_MEM_MAPS
);
132 map
->offset
= offset
;
137 /* Only allow shared memory to be removable since we only keep enough
138 * book keeping information about shared memory to allow for removal
139 * when processes fork.
141 if ((map
->flags
& _DRM_REMOVABLE
) && map
->type
!= _DRM_SHM
) {
142 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
145 DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
146 map
->offset
, map
->size
, map
->type
);
147 if ((map
->offset
& (~PAGE_MASK
)) || (map
->size
& (~PAGE_MASK
))) {
148 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
156 case _DRM_FRAME_BUFFER
:
157 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
158 if (map
->offset
+ map
->size
< map
->offset
||
159 map
->offset
< virt_to_phys(high_memory
)) {
160 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
165 map
->offset
+= dev
->hose
->mem_space
->start
;
167 /* Some drivers preinitialize some maps, without the X Server
168 * needing to be aware of it. Therefore, we just return success
169 * when the server tries to create a duplicate map.
171 list
= drm_find_matching_map(dev
, map
);
173 if (list
->map
->size
!= map
->size
) {
174 DRM_DEBUG("Matching maps of type %d with "
175 "mismatched sizes, (%ld vs %ld)\n",
176 map
->type
, map
->size
,
178 list
->map
->size
= map
->size
;
181 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
186 if (drm_core_has_MTRR(dev
)) {
187 if (map
->type
== _DRM_FRAME_BUFFER
||
188 (map
->flags
& _DRM_WRITE_COMBINING
)) {
189 map
->mtrr
= mtrr_add(map
->offset
, map
->size
,
190 MTRR_TYPE_WRCOMB
, 1);
193 if (map
->type
== _DRM_REGISTERS
)
194 map
->handle
= drm_ioremap(map
->offset
, map
->size
, dev
);
198 map
->handle
= vmalloc_32(map
->size
);
199 DRM_DEBUG("%lu %d %p\n",
200 map
->size
, drm_order(map
->size
), map
->handle
);
202 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
205 map
->offset
= (unsigned long)map
->handle
;
206 if (map
->flags
& _DRM_CONTAINS_LOCK
) {
207 /* Prevent a 2nd X Server from creating a 2nd lock */
208 if (dev
->lock
.hw_lock
!= NULL
) {
210 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
213 dev
->sigdata
.lock
= dev
->lock
.hw_lock
= map
->handle
; /* Pointer to lock */
217 if (drm_core_has_AGP(dev
)) {
219 map
->offset
+= dev
->hose
->mem_space
->start
;
221 map
->offset
+= dev
->agp
->base
;
222 map
->mtrr
= dev
->agp
->agp_mtrr
; /* for getmap */
225 case _DRM_SCATTER_GATHER
:
227 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
230 map
->offset
+= (unsigned long)dev
->sg
->virtual;
232 case _DRM_CONSISTENT
:
233 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
234 * As we're limiting the address to 2^32-1 (or less),
235 * casting it down to 32 bits is no problem, but we
236 * need to point to a 64bit variable first. */
237 dmah
= drm_pci_alloc(dev
, map
->size
, map
->size
, 0xffffffffUL
);
239 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
242 map
->handle
= dmah
->vaddr
;
243 map
->offset
= (unsigned long)dmah
->busaddr
;
247 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
251 list
= drm_alloc(sizeof(*list
), DRM_MEM_MAPS
);
253 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
256 memset(list
, 0, sizeof(*list
));
259 down(&dev
->struct_sem
);
260 list_add(&list
->head
, &dev
->maplist
->head
);
261 /* Assign a 32-bit handle */
262 /* We do it here so that dev->struct_sem protects the increment */
263 list
->user_token
= HandleID(map
->type
== _DRM_SHM
264 ? (unsigned long)map
->handle
266 up(&dev
->struct_sem
);
272 int drm_addmap(drm_device_t
* dev
, unsigned int offset
,
273 unsigned int size
, drm_map_type_t type
,
274 drm_map_flags_t flags
, drm_local_map_t
** map_ptr
)
276 drm_map_list_t
*list
;
279 rc
= drm_addmap_core(dev
, offset
, size
, type
, flags
, &list
);
281 *map_ptr
= list
->map
;
285 EXPORT_SYMBOL(drm_addmap
);
287 int drm_addmap_ioctl(struct inode
*inode
, struct file
*filp
,
288 unsigned int cmd
, unsigned long arg
)
290 drm_file_t
*priv
= filp
->private_data
;
291 drm_device_t
*dev
= priv
->head
->dev
;
293 drm_map_list_t
*maplist
;
294 drm_map_t __user
*argp
= (void __user
*)arg
;
297 if (!(filp
->f_mode
& 3))
298 return -EACCES
; /* Require read/write */
300 if (copy_from_user(&map
, argp
, sizeof(map
))) {
304 err
= drm_addmap_core(dev
, map
.offset
, map
.size
, map
.type
, map
.flags
,
310 if (copy_to_user(argp
, maplist
->map
, sizeof(drm_map_t
)))
312 if (put_user((void *)maplist
->user_token
, &argp
->handle
))
318 * Remove a map private from list and deallocate resources if the mapping
321 * \param inode device inode.
322 * \param filp file pointer.
323 * \param cmd command.
324 * \param arg pointer to a drm_map_t structure.
325 * \return zero on success or a negative value on error.
327 * Searches the map on drm_device::maplist, removes it from the list, see if
328 * its being used, and free any associate resource (such as MTRR's) if it's not
333 int drm_rmmap_locked(drm_device_t
* dev
, drm_local_map_t
* map
)
335 struct list_head
*list
;
336 drm_map_list_t
*r_list
= NULL
;
337 drm_dma_handle_t dmah
;
339 /* Find the list entry for the map and remove it */
340 list_for_each(list
, &dev
->maplist
->head
) {
341 r_list
= list_entry(list
, drm_map_list_t
, head
);
343 if (r_list
->map
== map
) {
345 drm_free(list
, sizeof(*list
), DRM_MEM_MAPS
);
350 /* List has wrapped around to the head pointer, or it's empty and we
351 * didn't find anything.
353 if (list
== (&dev
->maplist
->head
)) {
359 drm_ioremapfree(map
->handle
, map
->size
, dev
);
361 case _DRM_FRAME_BUFFER
:
362 if (drm_core_has_MTRR(dev
) && map
->mtrr
>= 0) {
364 retcode
= mtrr_del(map
->mtrr
, map
->offset
, map
->size
);
365 DRM_DEBUG("mtrr_del=%d\n", retcode
);
372 case _DRM_SCATTER_GATHER
:
374 case _DRM_CONSISTENT
:
375 dmah
.vaddr
= map
->handle
;
376 dmah
.busaddr
= map
->offset
;
377 dmah
.size
= map
->size
;
378 __drm_pci_free(dev
, &dmah
);
381 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
386 EXPORT_SYMBOL(drm_rmmap_locked
);
388 int drm_rmmap(drm_device_t
* dev
, drm_local_map_t
* map
)
392 down(&dev
->struct_sem
);
393 ret
= drm_rmmap_locked(dev
, map
);
394 up(&dev
->struct_sem
);
399 EXPORT_SYMBOL(drm_rmmap
);
401 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
402 * the last close of the device, and this is necessary for cleanup when things
403 * exit uncleanly. Therefore, having userland manually remove mappings seems
404 * like a pointless exercise since they're going away anyway.
406 * One use case might be after addmap is allowed for normal users for SHM and
407 * gets used by drivers that the server doesn't need to care about. This seems
410 int drm_rmmap_ioctl(struct inode
*inode
, struct file
*filp
,
411 unsigned int cmd
, unsigned long arg
)
413 drm_file_t
*priv
= filp
->private_data
;
414 drm_device_t
*dev
= priv
->head
->dev
;
416 drm_local_map_t
*map
= NULL
;
417 struct list_head
*list
;
420 if (copy_from_user(&request
, (drm_map_t __user
*) arg
, sizeof(request
))) {
424 down(&dev
->struct_sem
);
425 list_for_each(list
, &dev
->maplist
->head
) {
426 drm_map_list_t
*r_list
= list_entry(list
, drm_map_list_t
, head
);
429 r_list
->user_token
== (unsigned long)request
.handle
&&
430 r_list
->map
->flags
& _DRM_REMOVABLE
) {
436 /* List has wrapped around to the head pointer, or its empty we didn't
439 if (list
== (&dev
->maplist
->head
)) {
440 up(&dev
->struct_sem
);
447 /* Register and framebuffer maps are permanent */
448 if ((map
->type
== _DRM_REGISTERS
) || (map
->type
== _DRM_FRAME_BUFFER
)) {
449 up(&dev
->struct_sem
);
453 ret
= drm_rmmap_locked(dev
, map
);
455 up(&dev
->struct_sem
);
461 * Cleanup after an error on one of the addbufs() functions.
463 * \param dev DRM device.
464 * \param entry buffer entry where the error occurred.
466 * Frees any pages and buffers associated with the given entry.
468 static void drm_cleanup_buf_error(drm_device_t
* dev
, drm_buf_entry_t
* entry
)
472 if (entry
->seg_count
) {
473 for (i
= 0; i
< entry
->seg_count
; i
++) {
474 if (entry
->seglist
[i
]) {
475 drm_free_pages(entry
->seglist
[i
],
476 entry
->page_order
, DRM_MEM_DMA
);
479 drm_free(entry
->seglist
,
481 sizeof(*entry
->seglist
), DRM_MEM_SEGS
);
483 entry
->seg_count
= 0;
486 if (entry
->buf_count
) {
487 for (i
= 0; i
< entry
->buf_count
; i
++) {
488 if (entry
->buflist
[i
].dev_private
) {
489 drm_free(entry
->buflist
[i
].dev_private
,
490 entry
->buflist
[i
].dev_priv_size
,
494 drm_free(entry
->buflist
,
496 sizeof(*entry
->buflist
), DRM_MEM_BUFS
);
498 entry
->buf_count
= 0;
504 * Add AGP buffers for DMA transfers.
506 * \param dev drm_device_t to which the buffers are to be added.
507 * \param request pointer to a drm_buf_desc_t describing the request.
508 * \return zero on success or a negative number on failure.
510 * After some sanity checks creates a drm_buf structure for each buffer and
511 * reallocates the buffer list of the same size order to accommodate the new
514 int drm_addbufs_agp(drm_device_t
* dev
, drm_buf_desc_t
* request
)
516 drm_device_dma_t
*dma
= dev
->dma
;
517 drm_buf_entry_t
*entry
;
519 unsigned long offset
;
520 unsigned long agp_offset
;
529 drm_buf_t
**temp_buflist
;
534 count
= request
->count
;
535 order
= drm_order(request
->size
);
538 alignment
= (request
->flags
& _DRM_PAGE_ALIGN
)
539 ? PAGE_ALIGN(size
) : size
;
540 page_order
= order
- PAGE_SHIFT
> 0 ? order
- PAGE_SHIFT
: 0;
541 total
= PAGE_SIZE
<< page_order
;
544 agp_offset
= dev
->agp
->base
+ request
->agp_start
;
546 DRM_DEBUG("count: %d\n", count
);
547 DRM_DEBUG("order: %d\n", order
);
548 DRM_DEBUG("size: %d\n", size
);
549 DRM_DEBUG("agp_offset: %lu\n", agp_offset
);
550 DRM_DEBUG("alignment: %d\n", alignment
);
551 DRM_DEBUG("page_order: %d\n", page_order
);
552 DRM_DEBUG("total: %d\n", total
);
554 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
556 if (dev
->queue_count
)
557 return -EBUSY
; /* Not while in use */
559 spin_lock(&dev
->count_lock
);
561 spin_unlock(&dev
->count_lock
);
564 atomic_inc(&dev
->buf_alloc
);
565 spin_unlock(&dev
->count_lock
);
567 down(&dev
->struct_sem
);
568 entry
= &dma
->bufs
[order
];
569 if (entry
->buf_count
) {
570 up(&dev
->struct_sem
);
571 atomic_dec(&dev
->buf_alloc
);
572 return -ENOMEM
; /* May only call once for each order */
575 if (count
< 0 || count
> 4096) {
576 up(&dev
->struct_sem
);
577 atomic_dec(&dev
->buf_alloc
);
581 entry
->buflist
= drm_alloc(count
* sizeof(*entry
->buflist
),
583 if (!entry
->buflist
) {
584 up(&dev
->struct_sem
);
585 atomic_dec(&dev
->buf_alloc
);
588 memset(entry
->buflist
, 0, count
* sizeof(*entry
->buflist
));
590 entry
->buf_size
= size
;
591 entry
->page_order
= page_order
;
595 while (entry
->buf_count
< count
) {
596 buf
= &entry
->buflist
[entry
->buf_count
];
597 buf
->idx
= dma
->buf_count
+ entry
->buf_count
;
598 buf
->total
= alignment
;
602 buf
->offset
= (dma
->byte_count
+ offset
);
603 buf
->bus_address
= agp_offset
+ offset
;
604 buf
->address
= (void *)(agp_offset
+ offset
);
608 init_waitqueue_head(&buf
->dma_wait
);
611 buf
->dev_priv_size
= dev
->driver
->dev_priv_size
;
612 buf
->dev_private
= drm_alloc(buf
->dev_priv_size
, DRM_MEM_BUFS
);
613 if (!buf
->dev_private
) {
614 /* Set count correctly so we free the proper amount. */
615 entry
->buf_count
= count
;
616 drm_cleanup_buf_error(dev
, entry
);
617 up(&dev
->struct_sem
);
618 atomic_dec(&dev
->buf_alloc
);
621 memset(buf
->dev_private
, 0, buf
->dev_priv_size
);
623 DRM_DEBUG("buffer %d @ %p\n", entry
->buf_count
, buf
->address
);
627 byte_count
+= PAGE_SIZE
<< page_order
;
630 DRM_DEBUG("byte_count: %d\n", byte_count
);
632 temp_buflist
= drm_realloc(dma
->buflist
,
633 dma
->buf_count
* sizeof(*dma
->buflist
),
634 (dma
->buf_count
+ entry
->buf_count
)
635 * sizeof(*dma
->buflist
), DRM_MEM_BUFS
);
637 /* Free the entry because it isn't valid */
638 drm_cleanup_buf_error(dev
, entry
);
639 up(&dev
->struct_sem
);
640 atomic_dec(&dev
->buf_alloc
);
643 dma
->buflist
= temp_buflist
;
645 for (i
= 0; i
< entry
->buf_count
; i
++) {
646 dma
->buflist
[i
+ dma
->buf_count
] = &entry
->buflist
[i
];
649 dma
->buf_count
+= entry
->buf_count
;
650 dma
->byte_count
+= byte_count
;
652 DRM_DEBUG("dma->buf_count : %d\n", dma
->buf_count
);
653 DRM_DEBUG("entry->buf_count : %d\n", entry
->buf_count
);
655 up(&dev
->struct_sem
);
657 request
->count
= entry
->buf_count
;
658 request
->size
= size
;
660 dma
->flags
= _DRM_DMA_USE_AGP
;
662 atomic_dec(&dev
->buf_alloc
);
666 EXPORT_SYMBOL(drm_addbufs_agp
);
667 #endif /* __OS_HAS_AGP */
669 int drm_addbufs_pci(drm_device_t
* dev
, drm_buf_desc_t
* request
)
671 drm_device_dma_t
*dma
= dev
->dma
;
677 drm_buf_entry_t
*entry
;
681 unsigned long offset
;
685 unsigned long *temp_pagelist
;
686 drm_buf_t
**temp_buflist
;
688 if (!drm_core_check_feature(dev
, DRIVER_PCI_DMA
))
693 count
= request
->count
;
694 order
= drm_order(request
->size
);
697 DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
698 request
->count
, request
->size
, size
, order
, dev
->queue_count
);
700 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
702 if (dev
->queue_count
)
703 return -EBUSY
; /* Not while in use */
705 alignment
= (request
->flags
& _DRM_PAGE_ALIGN
)
706 ? PAGE_ALIGN(size
) : size
;
707 page_order
= order
- PAGE_SHIFT
> 0 ? order
- PAGE_SHIFT
: 0;
708 total
= PAGE_SIZE
<< page_order
;
710 spin_lock(&dev
->count_lock
);
712 spin_unlock(&dev
->count_lock
);
715 atomic_inc(&dev
->buf_alloc
);
716 spin_unlock(&dev
->count_lock
);
718 down(&dev
->struct_sem
);
719 entry
= &dma
->bufs
[order
];
720 if (entry
->buf_count
) {
721 up(&dev
->struct_sem
);
722 atomic_dec(&dev
->buf_alloc
);
723 return -ENOMEM
; /* May only call once for each order */
726 if (count
< 0 || count
> 4096) {
727 up(&dev
->struct_sem
);
728 atomic_dec(&dev
->buf_alloc
);
732 entry
->buflist
= drm_alloc(count
* sizeof(*entry
->buflist
),
734 if (!entry
->buflist
) {
735 up(&dev
->struct_sem
);
736 atomic_dec(&dev
->buf_alloc
);
739 memset(entry
->buflist
, 0, count
* sizeof(*entry
->buflist
));
741 entry
->seglist
= drm_alloc(count
* sizeof(*entry
->seglist
),
743 if (!entry
->seglist
) {
744 drm_free(entry
->buflist
,
745 count
* sizeof(*entry
->buflist
), DRM_MEM_BUFS
);
746 up(&dev
->struct_sem
);
747 atomic_dec(&dev
->buf_alloc
);
750 memset(entry
->seglist
, 0, count
* sizeof(*entry
->seglist
));
752 /* Keep the original pagelist until we know all the allocations
755 temp_pagelist
= drm_alloc((dma
->page_count
+ (count
<< page_order
))
756 * sizeof(*dma
->pagelist
), DRM_MEM_PAGES
);
757 if (!temp_pagelist
) {
758 drm_free(entry
->buflist
,
759 count
* sizeof(*entry
->buflist
), DRM_MEM_BUFS
);
760 drm_free(entry
->seglist
,
761 count
* sizeof(*entry
->seglist
), DRM_MEM_SEGS
);
762 up(&dev
->struct_sem
);
763 atomic_dec(&dev
->buf_alloc
);
766 memcpy(temp_pagelist
,
767 dma
->pagelist
, dma
->page_count
* sizeof(*dma
->pagelist
));
768 DRM_DEBUG("pagelist: %d entries\n",
769 dma
->page_count
+ (count
<< page_order
));
771 entry
->buf_size
= size
;
772 entry
->page_order
= page_order
;
776 while (entry
->buf_count
< count
) {
777 page
= drm_alloc_pages(page_order
, DRM_MEM_DMA
);
779 /* Set count correctly so we free the proper amount. */
780 entry
->buf_count
= count
;
781 entry
->seg_count
= count
;
782 drm_cleanup_buf_error(dev
, entry
);
783 drm_free(temp_pagelist
,
784 (dma
->page_count
+ (count
<< page_order
))
785 * sizeof(*dma
->pagelist
), DRM_MEM_PAGES
);
786 up(&dev
->struct_sem
);
787 atomic_dec(&dev
->buf_alloc
);
790 entry
->seglist
[entry
->seg_count
++] = page
;
791 for (i
= 0; i
< (1 << page_order
); i
++) {
792 DRM_DEBUG("page %d @ 0x%08lx\n",
793 dma
->page_count
+ page_count
,
794 page
+ PAGE_SIZE
* i
);
795 temp_pagelist
[dma
->page_count
+ page_count
++]
796 = page
+ PAGE_SIZE
* i
;
799 offset
+ size
<= total
&& entry
->buf_count
< count
;
800 offset
+= alignment
, ++entry
->buf_count
) {
801 buf
= &entry
->buflist
[entry
->buf_count
];
802 buf
->idx
= dma
->buf_count
+ entry
->buf_count
;
803 buf
->total
= alignment
;
806 buf
->offset
= (dma
->byte_count
+ byte_count
+ offset
);
807 buf
->address
= (void *)(page
+ offset
);
811 init_waitqueue_head(&buf
->dma_wait
);
814 buf
->dev_priv_size
= dev
->driver
->dev_priv_size
;
815 buf
->dev_private
= drm_alloc(buf
->dev_priv_size
,
817 if (!buf
->dev_private
) {
818 /* Set count correctly so we free the proper amount. */
819 entry
->buf_count
= count
;
820 entry
->seg_count
= count
;
821 drm_cleanup_buf_error(dev
, entry
);
822 drm_free(temp_pagelist
,
824 (count
<< page_order
))
825 * sizeof(*dma
->pagelist
),
827 up(&dev
->struct_sem
);
828 atomic_dec(&dev
->buf_alloc
);
831 memset(buf
->dev_private
, 0, buf
->dev_priv_size
);
833 DRM_DEBUG("buffer %d @ %p\n",
834 entry
->buf_count
, buf
->address
);
836 byte_count
+= PAGE_SIZE
<< page_order
;
839 temp_buflist
= drm_realloc(dma
->buflist
,
840 dma
->buf_count
* sizeof(*dma
->buflist
),
841 (dma
->buf_count
+ entry
->buf_count
)
842 * sizeof(*dma
->buflist
), DRM_MEM_BUFS
);
844 /* Free the entry because it isn't valid */
845 drm_cleanup_buf_error(dev
, entry
);
846 drm_free(temp_pagelist
,
847 (dma
->page_count
+ (count
<< page_order
))
848 * sizeof(*dma
->pagelist
), DRM_MEM_PAGES
);
849 up(&dev
->struct_sem
);
850 atomic_dec(&dev
->buf_alloc
);
853 dma
->buflist
= temp_buflist
;
855 for (i
= 0; i
< entry
->buf_count
; i
++) {
856 dma
->buflist
[i
+ dma
->buf_count
] = &entry
->buflist
[i
];
859 /* No allocations failed, so now we can replace the orginal pagelist
862 if (dma
->page_count
) {
863 drm_free(dma
->pagelist
,
864 dma
->page_count
* sizeof(*dma
->pagelist
),
867 dma
->pagelist
= temp_pagelist
;
869 dma
->buf_count
+= entry
->buf_count
;
870 dma
->seg_count
+= entry
->seg_count
;
871 dma
->page_count
+= entry
->seg_count
<< page_order
;
872 dma
->byte_count
+= PAGE_SIZE
* (entry
->seg_count
<< page_order
);
874 up(&dev
->struct_sem
);
876 request
->count
= entry
->buf_count
;
877 request
->size
= size
;
879 atomic_dec(&dev
->buf_alloc
);
884 EXPORT_SYMBOL(drm_addbufs_pci
);
886 static int drm_addbufs_sg(drm_device_t
* dev
, drm_buf_desc_t
* request
)
888 drm_device_dma_t
*dma
= dev
->dma
;
889 drm_buf_entry_t
*entry
;
891 unsigned long offset
;
892 unsigned long agp_offset
;
901 drm_buf_t
**temp_buflist
;
903 if (!drm_core_check_feature(dev
, DRIVER_SG
))
909 count
= request
->count
;
910 order
= drm_order(request
->size
);
913 alignment
= (request
->flags
& _DRM_PAGE_ALIGN
)
914 ? PAGE_ALIGN(size
) : size
;
915 page_order
= order
- PAGE_SHIFT
> 0 ? order
- PAGE_SHIFT
: 0;
916 total
= PAGE_SIZE
<< page_order
;
919 agp_offset
= request
->agp_start
;
921 DRM_DEBUG("count: %d\n", count
);
922 DRM_DEBUG("order: %d\n", order
);
923 DRM_DEBUG("size: %d\n", size
);
924 DRM_DEBUG("agp_offset: %lu\n", agp_offset
);
925 DRM_DEBUG("alignment: %d\n", alignment
);
926 DRM_DEBUG("page_order: %d\n", page_order
);
927 DRM_DEBUG("total: %d\n", total
);
929 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
931 if (dev
->queue_count
)
932 return -EBUSY
; /* Not while in use */
934 spin_lock(&dev
->count_lock
);
936 spin_unlock(&dev
->count_lock
);
939 atomic_inc(&dev
->buf_alloc
);
940 spin_unlock(&dev
->count_lock
);
942 down(&dev
->struct_sem
);
943 entry
= &dma
->bufs
[order
];
944 if (entry
->buf_count
) {
945 up(&dev
->struct_sem
);
946 atomic_dec(&dev
->buf_alloc
);
947 return -ENOMEM
; /* May only call once for each order */
950 if (count
< 0 || count
> 4096) {
951 up(&dev
->struct_sem
);
952 atomic_dec(&dev
->buf_alloc
);
956 entry
->buflist
= drm_alloc(count
* sizeof(*entry
->buflist
),
958 if (!entry
->buflist
) {
959 up(&dev
->struct_sem
);
960 atomic_dec(&dev
->buf_alloc
);
963 memset(entry
->buflist
, 0, count
* sizeof(*entry
->buflist
));
965 entry
->buf_size
= size
;
966 entry
->page_order
= page_order
;
970 while (entry
->buf_count
< count
) {
971 buf
= &entry
->buflist
[entry
->buf_count
];
972 buf
->idx
= dma
->buf_count
+ entry
->buf_count
;
973 buf
->total
= alignment
;
977 buf
->offset
= (dma
->byte_count
+ offset
);
978 buf
->bus_address
= agp_offset
+ offset
;
979 buf
->address
= (void *)(agp_offset
+ offset
980 + (unsigned long)dev
->sg
->virtual);
984 init_waitqueue_head(&buf
->dma_wait
);
987 buf
->dev_priv_size
= dev
->driver
->dev_priv_size
;
988 buf
->dev_private
= drm_alloc(buf
->dev_priv_size
, DRM_MEM_BUFS
);
989 if (!buf
->dev_private
) {
990 /* Set count correctly so we free the proper amount. */
991 entry
->buf_count
= count
;
992 drm_cleanup_buf_error(dev
, entry
);
993 up(&dev
->struct_sem
);
994 atomic_dec(&dev
->buf_alloc
);
998 memset(buf
->dev_private
, 0, buf
->dev_priv_size
);
1000 DRM_DEBUG("buffer %d @ %p\n", entry
->buf_count
, buf
->address
);
1002 offset
+= alignment
;
1004 byte_count
+= PAGE_SIZE
<< page_order
;
1007 DRM_DEBUG("byte_count: %d\n", byte_count
);
1009 temp_buflist
= drm_realloc(dma
->buflist
,
1010 dma
->buf_count
* sizeof(*dma
->buflist
),
1011 (dma
->buf_count
+ entry
->buf_count
)
1012 * sizeof(*dma
->buflist
), DRM_MEM_BUFS
);
1013 if (!temp_buflist
) {
1014 /* Free the entry because it isn't valid */
1015 drm_cleanup_buf_error(dev
, entry
);
1016 up(&dev
->struct_sem
);
1017 atomic_dec(&dev
->buf_alloc
);
1020 dma
->buflist
= temp_buflist
;
1022 for (i
= 0; i
< entry
->buf_count
; i
++) {
1023 dma
->buflist
[i
+ dma
->buf_count
] = &entry
->buflist
[i
];
1026 dma
->buf_count
+= entry
->buf_count
;
1027 dma
->byte_count
+= byte_count
;
1029 DRM_DEBUG("dma->buf_count : %d\n", dma
->buf_count
);
1030 DRM_DEBUG("entry->buf_count : %d\n", entry
->buf_count
);
1032 up(&dev
->struct_sem
);
1034 request
->count
= entry
->buf_count
;
1035 request
->size
= size
;
1037 dma
->flags
= _DRM_DMA_USE_SG
;
1039 atomic_dec(&dev
->buf_alloc
);
1043 static int drm_addbufs_fb(drm_device_t
* dev
, drm_buf_desc_t
* request
)
1045 drm_device_dma_t
*dma
= dev
->dma
;
1046 drm_buf_entry_t
*entry
;
1048 unsigned long offset
;
1049 unsigned long agp_offset
;
1058 drm_buf_t
**temp_buflist
;
1060 if (!drm_core_check_feature(dev
, DRIVER_FB_DMA
))
1066 count
= request
->count
;
1067 order
= drm_order(request
->size
);
1070 alignment
= (request
->flags
& _DRM_PAGE_ALIGN
)
1071 ? PAGE_ALIGN(size
) : size
;
1072 page_order
= order
- PAGE_SHIFT
> 0 ? order
- PAGE_SHIFT
: 0;
1073 total
= PAGE_SIZE
<< page_order
;
1076 agp_offset
= request
->agp_start
;
1078 DRM_DEBUG("count: %d\n", count
);
1079 DRM_DEBUG("order: %d\n", order
);
1080 DRM_DEBUG("size: %d\n", size
);
1081 DRM_DEBUG("agp_offset: %lu\n", agp_offset
);
1082 DRM_DEBUG("alignment: %d\n", alignment
);
1083 DRM_DEBUG("page_order: %d\n", page_order
);
1084 DRM_DEBUG("total: %d\n", total
);
1086 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
1088 if (dev
->queue_count
)
1089 return -EBUSY
; /* Not while in use */
1091 spin_lock(&dev
->count_lock
);
1093 spin_unlock(&dev
->count_lock
);
1096 atomic_inc(&dev
->buf_alloc
);
1097 spin_unlock(&dev
->count_lock
);
1099 down(&dev
->struct_sem
);
1100 entry
= &dma
->bufs
[order
];
1101 if (entry
->buf_count
) {
1102 up(&dev
->struct_sem
);
1103 atomic_dec(&dev
->buf_alloc
);
1104 return -ENOMEM
; /* May only call once for each order */
1107 if (count
< 0 || count
> 4096) {
1108 up(&dev
->struct_sem
);
1109 atomic_dec(&dev
->buf_alloc
);
1113 entry
->buflist
= drm_alloc(count
* sizeof(*entry
->buflist
),
1115 if (!entry
->buflist
) {
1116 up(&dev
->struct_sem
);
1117 atomic_dec(&dev
->buf_alloc
);
1120 memset(entry
->buflist
, 0, count
* sizeof(*entry
->buflist
));
1122 entry
->buf_size
= size
;
1123 entry
->page_order
= page_order
;
1127 while (entry
->buf_count
< count
) {
1128 buf
= &entry
->buflist
[entry
->buf_count
];
1129 buf
->idx
= dma
->buf_count
+ entry
->buf_count
;
1130 buf
->total
= alignment
;
1134 buf
->offset
= (dma
->byte_count
+ offset
);
1135 buf
->bus_address
= agp_offset
+ offset
;
1136 buf
->address
= (void *)(agp_offset
+ offset
);
1140 init_waitqueue_head(&buf
->dma_wait
);
1143 buf
->dev_priv_size
= dev
->driver
->dev_priv_size
;
1144 buf
->dev_private
= drm_alloc(buf
->dev_priv_size
, DRM_MEM_BUFS
);
1145 if (!buf
->dev_private
) {
1146 /* Set count correctly so we free the proper amount. */
1147 entry
->buf_count
= count
;
1148 drm_cleanup_buf_error(dev
, entry
);
1149 up(&dev
->struct_sem
);
1150 atomic_dec(&dev
->buf_alloc
);
1153 memset(buf
->dev_private
, 0, buf
->dev_priv_size
);
1155 DRM_DEBUG("buffer %d @ %p\n", entry
->buf_count
, buf
->address
);
1157 offset
+= alignment
;
1159 byte_count
+= PAGE_SIZE
<< page_order
;
1162 DRM_DEBUG("byte_count: %d\n", byte_count
);
1164 temp_buflist
= drm_realloc(dma
->buflist
,
1165 dma
->buf_count
* sizeof(*dma
->buflist
),
1166 (dma
->buf_count
+ entry
->buf_count
)
1167 * sizeof(*dma
->buflist
), DRM_MEM_BUFS
);
1168 if (!temp_buflist
) {
1169 /* Free the entry because it isn't valid */
1170 drm_cleanup_buf_error(dev
, entry
);
1171 up(&dev
->struct_sem
);
1172 atomic_dec(&dev
->buf_alloc
);
1175 dma
->buflist
= temp_buflist
;
1177 for (i
= 0; i
< entry
->buf_count
; i
++) {
1178 dma
->buflist
[i
+ dma
->buf_count
] = &entry
->buflist
[i
];
1181 dma
->buf_count
+= entry
->buf_count
;
1182 dma
->byte_count
+= byte_count
;
1184 DRM_DEBUG("dma->buf_count : %d\n", dma
->buf_count
);
1185 DRM_DEBUG("entry->buf_count : %d\n", entry
->buf_count
);
1187 up(&dev
->struct_sem
);
1189 request
->count
= entry
->buf_count
;
1190 request
->size
= size
;
1192 dma
->flags
= _DRM_DMA_USE_FB
;
1194 atomic_dec(&dev
->buf_alloc
);
1199 * Add buffers for DMA transfers (ioctl).
1201 * \param inode device inode.
1202 * \param filp file pointer.
1203 * \param cmd command.
1204 * \param arg pointer to a drm_buf_desc_t request.
1205 * \return zero on success or a negative number on failure.
1207 * According with the memory type specified in drm_buf_desc::flags and the
1208 * build options, it dispatches the call either to addbufs_agp(),
1209 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1210 * PCI memory respectively.
1212 int drm_addbufs(struct inode
*inode
, struct file
*filp
,
1213 unsigned int cmd
, unsigned long arg
)
1215 drm_buf_desc_t request
;
1216 drm_file_t
*priv
= filp
->private_data
;
1217 drm_device_t
*dev
= priv
->head
->dev
;
1220 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1223 if (copy_from_user(&request
, (drm_buf_desc_t __user
*) arg
,
1228 if (request
.flags
& _DRM_AGP_BUFFER
)
1229 ret
= drm_addbufs_agp(dev
, &request
);
1232 if (request
.flags
& _DRM_SG_BUFFER
)
1233 ret
= drm_addbufs_sg(dev
, &request
);
1234 else if (request
.flags
& _DRM_FB_BUFFER
)
1235 ret
= drm_addbufs_fb(dev
, &request
);
1237 ret
= drm_addbufs_pci(dev
, &request
);
1240 if (copy_to_user((void __user
*)arg
, &request
, sizeof(request
))) {
1248 * Get information about the buffer mappings.
1250 * This was originally mean for debugging purposes, or by a sophisticated
1251 * client library to determine how best to use the available buffers (e.g.,
1252 * large buffers can be used for image transfer).
1254 * \param inode device inode.
1255 * \param filp file pointer.
1256 * \param cmd command.
1257 * \param arg pointer to a drm_buf_info structure.
1258 * \return zero on success or a negative number on failure.
1260 * Increments drm_device::buf_use while holding the drm_device::count_lock
1261 * lock, preventing of allocating more buffers after this call. Information
1262 * about each requested buffer is then copied into user space.
1264 int drm_infobufs(struct inode
*inode
, struct file
*filp
,
1265 unsigned int cmd
, unsigned long arg
)
1267 drm_file_t
*priv
= filp
->private_data
;
1268 drm_device_t
*dev
= priv
->head
->dev
;
1269 drm_device_dma_t
*dma
= dev
->dma
;
1270 drm_buf_info_t request
;
1271 drm_buf_info_t __user
*argp
= (void __user
*)arg
;
1275 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1281 spin_lock(&dev
->count_lock
);
1282 if (atomic_read(&dev
->buf_alloc
)) {
1283 spin_unlock(&dev
->count_lock
);
1286 ++dev
->buf_use
; /* Can't allocate more after this call */
1287 spin_unlock(&dev
->count_lock
);
1289 if (copy_from_user(&request
, argp
, sizeof(request
)))
1292 for (i
= 0, count
= 0; i
< DRM_MAX_ORDER
+ 1; i
++) {
1293 if (dma
->bufs
[i
].buf_count
)
1297 DRM_DEBUG("count = %d\n", count
);
1299 if (request
.count
>= count
) {
1300 for (i
= 0, count
= 0; i
< DRM_MAX_ORDER
+ 1; i
++) {
1301 if (dma
->bufs
[i
].buf_count
) {
1302 drm_buf_desc_t __user
*to
=
1303 &request
.list
[count
];
1304 drm_buf_entry_t
*from
= &dma
->bufs
[i
];
1305 drm_freelist_t
*list
= &dma
->bufs
[i
].freelist
;
1306 if (copy_to_user(&to
->count
,
1308 sizeof(from
->buf_count
)) ||
1309 copy_to_user(&to
->size
,
1311 sizeof(from
->buf_size
)) ||
1312 copy_to_user(&to
->low_mark
,
1314 sizeof(list
->low_mark
)) ||
1315 copy_to_user(&to
->high_mark
,
1317 sizeof(list
->high_mark
)))
1320 DRM_DEBUG("%d %d %d %d %d\n",
1322 dma
->bufs
[i
].buf_count
,
1323 dma
->bufs
[i
].buf_size
,
1324 dma
->bufs
[i
].freelist
.low_mark
,
1325 dma
->bufs
[i
].freelist
.high_mark
);
1330 request
.count
= count
;
1332 if (copy_to_user(argp
, &request
, sizeof(request
)))
1339 * Specifies a low and high water mark for buffer allocation
1341 * \param inode device inode.
1342 * \param filp file pointer.
1343 * \param cmd command.
1344 * \param arg a pointer to a drm_buf_desc structure.
1345 * \return zero on success or a negative number on failure.
1347 * Verifies that the size order is bounded between the admissible orders and
1348 * updates the respective drm_device_dma::bufs entry low and high water mark.
1350 * \note This ioctl is deprecated and mostly never used.
1352 int drm_markbufs(struct inode
*inode
, struct file
*filp
,
1353 unsigned int cmd
, unsigned long arg
)
1355 drm_file_t
*priv
= filp
->private_data
;
1356 drm_device_t
*dev
= priv
->head
->dev
;
1357 drm_device_dma_t
*dma
= dev
->dma
;
1358 drm_buf_desc_t request
;
1360 drm_buf_entry_t
*entry
;
1362 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1368 if (copy_from_user(&request
,
1369 (drm_buf_desc_t __user
*) arg
, sizeof(request
)))
1372 DRM_DEBUG("%d, %d, %d\n",
1373 request
.size
, request
.low_mark
, request
.high_mark
);
1374 order
= drm_order(request
.size
);
1375 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
1377 entry
= &dma
->bufs
[order
];
1379 if (request
.low_mark
< 0 || request
.low_mark
> entry
->buf_count
)
1381 if (request
.high_mark
< 0 || request
.high_mark
> entry
->buf_count
)
1384 entry
->freelist
.low_mark
= request
.low_mark
;
1385 entry
->freelist
.high_mark
= request
.high_mark
;
1391 * Unreserve the buffers in list, previously reserved using drmDMA.
1393 * \param inode device inode.
1394 * \param filp file pointer.
1395 * \param cmd command.
1396 * \param arg pointer to a drm_buf_free structure.
1397 * \return zero on success or a negative number on failure.
1399 * Calls free_buffer() for each used buffer.
1400 * This function is primarily used for debugging.
1402 int drm_freebufs(struct inode
*inode
, struct file
*filp
,
1403 unsigned int cmd
, unsigned long arg
)
1405 drm_file_t
*priv
= filp
->private_data
;
1406 drm_device_t
*dev
= priv
->head
->dev
;
1407 drm_device_dma_t
*dma
= dev
->dma
;
1408 drm_buf_free_t request
;
1413 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1419 if (copy_from_user(&request
,
1420 (drm_buf_free_t __user
*) arg
, sizeof(request
)))
1423 DRM_DEBUG("%d\n", request
.count
);
1424 for (i
= 0; i
< request
.count
; i
++) {
1425 if (copy_from_user(&idx
, &request
.list
[i
], sizeof(idx
)))
1427 if (idx
< 0 || idx
>= dma
->buf_count
) {
1428 DRM_ERROR("Index %d (of %d max)\n",
1429 idx
, dma
->buf_count
- 1);
1432 buf
= dma
->buflist
[idx
];
1433 if (buf
->filp
!= filp
) {
1434 DRM_ERROR("Process %d freeing buffer not owned\n",
1438 drm_free_buffer(dev
, buf
);
1445 * Maps all of the DMA buffers into client-virtual space (ioctl).
1447 * \param inode device inode.
1448 * \param filp file pointer.
1449 * \param cmd command.
1450 * \param arg pointer to a drm_buf_map structure.
1451 * \return zero on success or a negative number on failure.
1453 * Maps the AGP or SG buffer region with do_mmap(), and copies information
1454 * about each buffer into user space. The PCI buffers are already mapped on the
1455 * addbufs_pci() call.
1457 int drm_mapbufs(struct inode
*inode
, struct file
*filp
,
1458 unsigned int cmd
, unsigned long arg
)
1460 drm_file_t
*priv
= filp
->private_data
;
1461 drm_device_t
*dev
= priv
->head
->dev
;
1462 drm_device_dma_t
*dma
= dev
->dma
;
1463 drm_buf_map_t __user
*argp
= (void __user
*)arg
;
1466 unsigned long virtual;
1467 unsigned long address
;
1468 drm_buf_map_t request
;
1471 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1477 spin_lock(&dev
->count_lock
);
1478 if (atomic_read(&dev
->buf_alloc
)) {
1479 spin_unlock(&dev
->count_lock
);
1482 dev
->buf_use
++; /* Can't allocate more after this call */
1483 spin_unlock(&dev
->count_lock
);
1485 if (copy_from_user(&request
, argp
, sizeof(request
)))
1488 if (request
.count
>= dma
->buf_count
) {
1489 if ((drm_core_has_AGP(dev
) && (dma
->flags
& _DRM_DMA_USE_AGP
))
1490 || (drm_core_check_feature(dev
, DRIVER_SG
)
1491 && (dma
->flags
& _DRM_DMA_USE_SG
))
1492 || (drm_core_check_feature(dev
, DRIVER_FB_DMA
)
1493 && (dma
->flags
& _DRM_DMA_USE_FB
))) {
1494 drm_map_t
*map
= dev
->agp_buffer_map
;
1495 unsigned long token
= dev
->agp_buffer_token
;
1502 down_write(¤t
->mm
->mmap_sem
);
1503 virtual = do_mmap(filp
, 0, map
->size
,
1504 PROT_READ
| PROT_WRITE
,
1506 up_write(¤t
->mm
->mmap_sem
);
1508 down_write(¤t
->mm
->mmap_sem
);
1509 virtual = do_mmap(filp
, 0, dma
->byte_count
,
1510 PROT_READ
| PROT_WRITE
,
1512 up_write(¤t
->mm
->mmap_sem
);
1514 if (virtual > -1024UL) {
1516 retcode
= (signed long)virtual;
1519 request
.virtual = (void __user
*)virtual;
1521 for (i
= 0; i
< dma
->buf_count
; i
++) {
1522 if (copy_to_user(&request
.list
[i
].idx
,
1523 &dma
->buflist
[i
]->idx
,
1524 sizeof(request
.list
[0].idx
))) {
1528 if (copy_to_user(&request
.list
[i
].total
,
1529 &dma
->buflist
[i
]->total
,
1530 sizeof(request
.list
[0].total
))) {
1534 if (copy_to_user(&request
.list
[i
].used
,
1535 &zero
, sizeof(zero
))) {
1539 address
= virtual + dma
->buflist
[i
]->offset
; /* *** */
1540 if (copy_to_user(&request
.list
[i
].address
,
1541 &address
, sizeof(address
))) {
1548 request
.count
= dma
->buf_count
;
1549 DRM_DEBUG("%d buffers, retcode = %d\n", request
.count
, retcode
);
1551 if (copy_to_user(argp
, &request
, sizeof(request
)))
1558 * Compute size order. Returns the exponent of the smaller power of two which
1559 * is greater or equal to given number.
1564 * \todo Can be made faster.
1566 int drm_order(unsigned long size
)
1571 for (order
= 0, tmp
= size
>> 1; tmp
; tmp
>>= 1, order
++) ;
1573 if (size
& (size
- 1))
1579 EXPORT_SYMBOL(drm_order
);