]>
git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/char/drm/drm_bufs.c
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
);
43 EXPORT_SYMBOL(drm_get_resource_start
);
45 unsigned long drm_get_resource_len(drm_device_t
*dev
, unsigned int resource
)
47 return pci_resource_len(dev
->pdev
, resource
);
50 EXPORT_SYMBOL(drm_get_resource_len
);
52 static drm_map_list_t
*drm_find_matching_map(drm_device_t
*dev
,
55 struct list_head
*list
;
57 list_for_each(list
, &dev
->maplist
->head
) {
58 drm_map_list_t
*entry
= list_entry(list
, drm_map_list_t
, head
);
59 if (entry
->map
&& map
->type
== entry
->map
->type
&&
60 entry
->map
->offset
== map
->offset
) {
69 * Used to allocate 32-bit handles for mappings.
71 #define START_RANGE 0x10000000
72 #define END_RANGE 0x40000000
75 static __inline__
unsigned int HandleID(unsigned long lhandle
,
78 static unsigned int map32_handle
= START_RANGE
;
81 if (lhandle
& 0xffffffff00000000) {
83 map32_handle
+= PAGE_SIZE
;
84 if (map32_handle
> END_RANGE
)
85 map32_handle
= START_RANGE
;
90 drm_map_list_t
*_entry
;
91 list_for_each_entry(_entry
, &dev
->maplist
->head
, head
) {
92 if (_entry
->user_token
== hash
)
95 if (&_entry
->head
== &dev
->maplist
->head
)
99 map32_handle
+= PAGE_SIZE
;
103 # define HandleID(x,dev) (unsigned int)(x)
107 * Ioctl to specify a range of memory that is available for mapping by a non-root process.
109 * \param inode device inode.
110 * \param filp file pointer.
111 * \param cmd command.
112 * \param arg pointer to a drm_map structure.
113 * \return zero on success or a negative value on error.
115 * Adjusts the memory offset to its absolute value according to the mapping
116 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
117 * applicable and if supported by the kernel.
119 static int drm_addmap_core(drm_device_t
* dev
, unsigned int offset
,
120 unsigned int size
, drm_map_type_t type
,
121 drm_map_flags_t flags
, drm_map_list_t
** maplist
)
124 drm_map_list_t
*list
;
125 drm_dma_handle_t
*dmah
;
127 map
= drm_alloc(sizeof(*map
), DRM_MEM_MAPS
);
131 map
->offset
= offset
;
136 /* Only allow shared memory to be removable since we only keep enough
137 * book keeping information about shared memory to allow for removal
138 * when processes fork.
140 if ((map
->flags
& _DRM_REMOVABLE
) && map
->type
!= _DRM_SHM
) {
141 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
144 DRM_DEBUG("offset = 0x%08lx, size = 0x%08lx, type = %d\n",
145 map
->offset
, map
->size
, map
->type
);
146 if ((map
->offset
& (~PAGE_MASK
)) || (map
->size
& (~PAGE_MASK
))) {
147 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
155 case _DRM_FRAME_BUFFER
:
156 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__)
157 if (map
->offset
+ (map
->size
-1) < map
->offset
||
158 map
->offset
< virt_to_phys(high_memory
)) {
159 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
164 map
->offset
+= dev
->hose
->mem_space
->start
;
166 /* Some drivers preinitialize some maps, without the X Server
167 * needing to be aware of it. Therefore, we just return success
168 * when the server tries to create a duplicate map.
170 list
= drm_find_matching_map(dev
, map
);
172 if (list
->map
->size
!= map
->size
) {
173 DRM_DEBUG("Matching maps of type %d with "
174 "mismatched sizes, (%ld vs %ld)\n",
175 map
->type
, map
->size
,
177 list
->map
->size
= map
->size
;
180 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
185 if (drm_core_has_MTRR(dev
)) {
186 if (map
->type
== _DRM_FRAME_BUFFER
||
187 (map
->flags
& _DRM_WRITE_COMBINING
)) {
188 map
->mtrr
= mtrr_add(map
->offset
, map
->size
,
189 MTRR_TYPE_WRCOMB
, 1);
192 if (map
->type
== _DRM_REGISTERS
)
193 map
->handle
= drm_ioremap(map
->offset
, map
->size
, dev
);
197 map
->handle
= vmalloc_32(map
->size
);
198 DRM_DEBUG("%lu %d %p\n",
199 map
->size
, drm_order(map
->size
), map
->handle
);
201 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
204 map
->offset
= (unsigned long)map
->handle
;
205 if (map
->flags
& _DRM_CONTAINS_LOCK
) {
206 /* Prevent a 2nd X Server from creating a 2nd lock */
207 if (dev
->lock
.hw_lock
!= NULL
) {
209 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
212 dev
->sigdata
.lock
= dev
->lock
.hw_lock
= map
->handle
; /* Pointer to lock */
216 if (drm_core_has_AGP(dev
)) {
218 map
->offset
+= dev
->hose
->mem_space
->start
;
220 map
->offset
+= dev
->agp
->base
;
221 map
->mtrr
= dev
->agp
->agp_mtrr
; /* for getmap */
224 case _DRM_SCATTER_GATHER
:
226 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
229 map
->offset
+= (unsigned long)dev
->sg
->virtual;
231 case _DRM_CONSISTENT
:
232 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
233 * As we're limiting the address to 2^32-1 (or less),
234 * casting it down to 32 bits is no problem, but we
235 * need to point to a 64bit variable first. */
236 dmah
= drm_pci_alloc(dev
, map
->size
, map
->size
, 0xffffffffUL
);
238 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
241 map
->handle
= dmah
->vaddr
;
242 map
->offset
= (unsigned long)dmah
->busaddr
;
246 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
250 list
= drm_alloc(sizeof(*list
), DRM_MEM_MAPS
);
252 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
255 memset(list
, 0, sizeof(*list
));
258 mutex_lock(&dev
->struct_mutex
);
259 list_add(&list
->head
, &dev
->maplist
->head
);
260 /* Assign a 32-bit handle */
261 /* We do it here so that dev->struct_mutex protects the increment */
262 list
->user_token
= HandleID(map
->type
== _DRM_SHM
263 ? (unsigned long)map
->handle
265 mutex_unlock(&dev
->struct_mutex
);
271 int drm_addmap(drm_device_t
* dev
, unsigned int offset
,
272 unsigned int size
, drm_map_type_t type
,
273 drm_map_flags_t flags
, drm_local_map_t
** map_ptr
)
275 drm_map_list_t
*list
;
278 rc
= drm_addmap_core(dev
, offset
, size
, type
, flags
, &list
);
280 *map_ptr
= list
->map
;
284 EXPORT_SYMBOL(drm_addmap
);
286 int drm_addmap_ioctl(struct inode
*inode
, struct file
*filp
,
287 unsigned int cmd
, unsigned long arg
)
289 drm_file_t
*priv
= filp
->private_data
;
290 drm_device_t
*dev
= priv
->head
->dev
;
292 drm_map_list_t
*maplist
;
293 drm_map_t __user
*argp
= (void __user
*)arg
;
296 if (!(filp
->f_mode
& 3))
297 return -EACCES
; /* Require read/write */
299 if (copy_from_user(&map
, argp
, sizeof(map
))) {
303 if (!(capable(CAP_SYS_ADMIN
) || map
.type
== _DRM_AGP
))
306 err
= drm_addmap_core(dev
, map
.offset
, map
.size
, map
.type
, map
.flags
,
312 if (copy_to_user(argp
, maplist
->map
, sizeof(drm_map_t
)))
315 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
316 if (put_user((void *)(unsigned long)maplist
->user_token
, &argp
->handle
))
322 * Remove a map private from list and deallocate resources if the mapping
325 * \param inode device inode.
326 * \param filp file pointer.
327 * \param cmd command.
328 * \param arg pointer to a drm_map_t structure.
329 * \return zero on success or a negative value on error.
331 * Searches the map on drm_device::maplist, removes it from the list, see if
332 * its being used, and free any associate resource (such as MTRR's) if it's not
337 int drm_rmmap_locked(drm_device_t
*dev
, drm_local_map_t
*map
)
339 struct list_head
*list
;
340 drm_map_list_t
*r_list
= NULL
;
341 drm_dma_handle_t dmah
;
343 /* Find the list entry for the map and remove it */
344 list_for_each(list
, &dev
->maplist
->head
) {
345 r_list
= list_entry(list
, drm_map_list_t
, head
);
347 if (r_list
->map
== map
) {
349 drm_free(list
, sizeof(*list
), DRM_MEM_MAPS
);
354 /* List has wrapped around to the head pointer, or it's empty and we
355 * didn't find anything.
357 if (list
== (&dev
->maplist
->head
)) {
363 drm_ioremapfree(map
->handle
, map
->size
, dev
);
365 case _DRM_FRAME_BUFFER
:
366 if (drm_core_has_MTRR(dev
) && map
->mtrr
>= 0) {
368 retcode
= mtrr_del(map
->mtrr
, map
->offset
, map
->size
);
369 DRM_DEBUG("mtrr_del=%d\n", retcode
);
376 case _DRM_SCATTER_GATHER
:
378 case _DRM_CONSISTENT
:
379 dmah
.vaddr
= map
->handle
;
380 dmah
.busaddr
= map
->offset
;
381 dmah
.size
= map
->size
;
382 __drm_pci_free(dev
, &dmah
);
385 drm_free(map
, sizeof(*map
), DRM_MEM_MAPS
);
389 EXPORT_SYMBOL(drm_rmmap_locked
);
391 int drm_rmmap(drm_device_t
*dev
, drm_local_map_t
*map
)
395 mutex_lock(&dev
->struct_mutex
);
396 ret
= drm_rmmap_locked(dev
, map
);
397 mutex_unlock(&dev
->struct_mutex
);
401 EXPORT_SYMBOL(drm_rmmap
);
403 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
404 * the last close of the device, and this is necessary for cleanup when things
405 * exit uncleanly. Therefore, having userland manually remove mappings seems
406 * like a pointless exercise since they're going away anyway.
408 * One use case might be after addmap is allowed for normal users for SHM and
409 * gets used by drivers that the server doesn't need to care about. This seems
412 int drm_rmmap_ioctl(struct inode
*inode
, struct file
*filp
,
413 unsigned int cmd
, unsigned long arg
)
415 drm_file_t
*priv
= filp
->private_data
;
416 drm_device_t
*dev
= priv
->head
->dev
;
418 drm_local_map_t
*map
= NULL
;
419 struct list_head
*list
;
422 if (copy_from_user(&request
, (drm_map_t __user
*) arg
, sizeof(request
))) {
426 mutex_lock(&dev
->struct_mutex
);
427 list_for_each(list
, &dev
->maplist
->head
) {
428 drm_map_list_t
*r_list
= list_entry(list
, drm_map_list_t
, head
);
431 r_list
->user_token
== (unsigned long)request
.handle
&&
432 r_list
->map
->flags
& _DRM_REMOVABLE
) {
438 /* List has wrapped around to the head pointer, or its empty we didn't
441 if (list
== (&dev
->maplist
->head
)) {
442 mutex_unlock(&dev
->struct_mutex
);
449 /* Register and framebuffer maps are permanent */
450 if ((map
->type
== _DRM_REGISTERS
) || (map
->type
== _DRM_FRAME_BUFFER
)) {
451 mutex_unlock(&dev
->struct_mutex
);
455 ret
= drm_rmmap_locked(dev
, map
);
457 mutex_unlock(&dev
->struct_mutex
);
463 * Cleanup after an error on one of the addbufs() functions.
465 * \param dev DRM device.
466 * \param entry buffer entry where the error occurred.
468 * Frees any pages and buffers associated with the given entry.
470 static void drm_cleanup_buf_error(drm_device_t
* dev
, drm_buf_entry_t
* entry
)
474 if (entry
->seg_count
) {
475 for (i
= 0; i
< entry
->seg_count
; i
++) {
476 if (entry
->seglist
[i
]) {
477 drm_free_pages(entry
->seglist
[i
],
478 entry
->page_order
, DRM_MEM_DMA
);
481 drm_free(entry
->seglist
,
483 sizeof(*entry
->seglist
), DRM_MEM_SEGS
);
485 entry
->seg_count
= 0;
488 if (entry
->buf_count
) {
489 for (i
= 0; i
< entry
->buf_count
; i
++) {
490 if (entry
->buflist
[i
].dev_private
) {
491 drm_free(entry
->buflist
[i
].dev_private
,
492 entry
->buflist
[i
].dev_priv_size
,
496 drm_free(entry
->buflist
,
498 sizeof(*entry
->buflist
), DRM_MEM_BUFS
);
500 entry
->buf_count
= 0;
506 * Add AGP buffers for DMA transfers.
508 * \param dev drm_device_t to which the buffers are to be added.
509 * \param request pointer to a drm_buf_desc_t describing the request.
510 * \return zero on success or a negative number on failure.
512 * After some sanity checks creates a drm_buf structure for each buffer and
513 * reallocates the buffer list of the same size order to accommodate the new
516 int drm_addbufs_agp(drm_device_t
* dev
, drm_buf_desc_t
* request
)
518 drm_device_dma_t
*dma
= dev
->dma
;
519 drm_buf_entry_t
*entry
;
521 unsigned long offset
;
522 unsigned long agp_offset
;
531 drm_buf_t
**temp_buflist
;
536 count
= request
->count
;
537 order
= drm_order(request
->size
);
540 alignment
= (request
->flags
& _DRM_PAGE_ALIGN
)
541 ? PAGE_ALIGN(size
) : size
;
542 page_order
= order
- PAGE_SHIFT
> 0 ? order
- PAGE_SHIFT
: 0;
543 total
= PAGE_SIZE
<< page_order
;
546 agp_offset
= dev
->agp
->base
+ request
->agp_start
;
548 DRM_DEBUG("count: %d\n", count
);
549 DRM_DEBUG("order: %d\n", order
);
550 DRM_DEBUG("size: %d\n", size
);
551 DRM_DEBUG("agp_offset: %lx\n", agp_offset
);
552 DRM_DEBUG("alignment: %d\n", alignment
);
553 DRM_DEBUG("page_order: %d\n", page_order
);
554 DRM_DEBUG("total: %d\n", total
);
556 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
558 if (dev
->queue_count
)
559 return -EBUSY
; /* Not while in use */
561 spin_lock(&dev
->count_lock
);
563 spin_unlock(&dev
->count_lock
);
566 atomic_inc(&dev
->buf_alloc
);
567 spin_unlock(&dev
->count_lock
);
569 mutex_lock(&dev
->struct_mutex
);
570 entry
= &dma
->bufs
[order
];
571 if (entry
->buf_count
) {
572 mutex_unlock(&dev
->struct_mutex
);
573 atomic_dec(&dev
->buf_alloc
);
574 return -ENOMEM
; /* May only call once for each order */
577 if (count
< 0 || count
> 4096) {
578 mutex_unlock(&dev
->struct_mutex
);
579 atomic_dec(&dev
->buf_alloc
);
583 entry
->buflist
= drm_alloc(count
* sizeof(*entry
->buflist
),
585 if (!entry
->buflist
) {
586 mutex_unlock(&dev
->struct_mutex
);
587 atomic_dec(&dev
->buf_alloc
);
590 memset(entry
->buflist
, 0, count
* sizeof(*entry
->buflist
));
592 entry
->buf_size
= size
;
593 entry
->page_order
= page_order
;
597 while (entry
->buf_count
< count
) {
598 buf
= &entry
->buflist
[entry
->buf_count
];
599 buf
->idx
= dma
->buf_count
+ entry
->buf_count
;
600 buf
->total
= alignment
;
604 buf
->offset
= (dma
->byte_count
+ offset
);
605 buf
->bus_address
= agp_offset
+ offset
;
606 buf
->address
= (void *)(agp_offset
+ offset
);
610 init_waitqueue_head(&buf
->dma_wait
);
613 buf
->dev_priv_size
= dev
->driver
->dev_priv_size
;
614 buf
->dev_private
= drm_alloc(buf
->dev_priv_size
, DRM_MEM_BUFS
);
615 if (!buf
->dev_private
) {
616 /* Set count correctly so we free the proper amount. */
617 entry
->buf_count
= count
;
618 drm_cleanup_buf_error(dev
, entry
);
619 mutex_unlock(&dev
->struct_mutex
);
620 atomic_dec(&dev
->buf_alloc
);
623 memset(buf
->dev_private
, 0, buf
->dev_priv_size
);
625 DRM_DEBUG("buffer %d @ %p\n", entry
->buf_count
, buf
->address
);
629 byte_count
+= PAGE_SIZE
<< page_order
;
632 DRM_DEBUG("byte_count: %d\n", byte_count
);
634 temp_buflist
= drm_realloc(dma
->buflist
,
635 dma
->buf_count
* sizeof(*dma
->buflist
),
636 (dma
->buf_count
+ entry
->buf_count
)
637 * sizeof(*dma
->buflist
), DRM_MEM_BUFS
);
639 /* Free the entry because it isn't valid */
640 drm_cleanup_buf_error(dev
, entry
);
641 mutex_unlock(&dev
->struct_mutex
);
642 atomic_dec(&dev
->buf_alloc
);
645 dma
->buflist
= temp_buflist
;
647 for (i
= 0; i
< entry
->buf_count
; i
++) {
648 dma
->buflist
[i
+ dma
->buf_count
] = &entry
->buflist
[i
];
651 dma
->buf_count
+= entry
->buf_count
;
652 dma
->seg_count
+= entry
->seg_count
;
653 dma
->page_count
+= byte_count
>> PAGE_SHIFT
;
654 dma
->byte_count
+= byte_count
;
656 DRM_DEBUG("dma->buf_count : %d\n", dma
->buf_count
);
657 DRM_DEBUG("entry->buf_count : %d\n", entry
->buf_count
);
659 mutex_unlock(&dev
->struct_mutex
);
661 request
->count
= entry
->buf_count
;
662 request
->size
= size
;
664 dma
->flags
= _DRM_DMA_USE_AGP
;
666 atomic_dec(&dev
->buf_alloc
);
669 EXPORT_SYMBOL(drm_addbufs_agp
);
670 #endif /* __OS_HAS_AGP */
672 int drm_addbufs_pci(drm_device_t
* dev
, drm_buf_desc_t
* request
)
674 drm_device_dma_t
*dma
= dev
->dma
;
680 drm_buf_entry_t
*entry
;
684 unsigned long offset
;
688 unsigned long *temp_pagelist
;
689 drm_buf_t
**temp_buflist
;
691 if (!drm_core_check_feature(dev
, DRIVER_PCI_DMA
))
697 if (!capable(CAP_SYS_ADMIN
))
700 count
= request
->count
;
701 order
= drm_order(request
->size
);
704 DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
705 request
->count
, request
->size
, size
, order
, dev
->queue_count
);
707 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
709 if (dev
->queue_count
)
710 return -EBUSY
; /* Not while in use */
712 alignment
= (request
->flags
& _DRM_PAGE_ALIGN
)
713 ? PAGE_ALIGN(size
) : size
;
714 page_order
= order
- PAGE_SHIFT
> 0 ? order
- PAGE_SHIFT
: 0;
715 total
= PAGE_SIZE
<< page_order
;
717 spin_lock(&dev
->count_lock
);
719 spin_unlock(&dev
->count_lock
);
722 atomic_inc(&dev
->buf_alloc
);
723 spin_unlock(&dev
->count_lock
);
725 mutex_lock(&dev
->struct_mutex
);
726 entry
= &dma
->bufs
[order
];
727 if (entry
->buf_count
) {
728 mutex_unlock(&dev
->struct_mutex
);
729 atomic_dec(&dev
->buf_alloc
);
730 return -ENOMEM
; /* May only call once for each order */
733 if (count
< 0 || count
> 4096) {
734 mutex_unlock(&dev
->struct_mutex
);
735 atomic_dec(&dev
->buf_alloc
);
739 entry
->buflist
= drm_alloc(count
* sizeof(*entry
->buflist
),
741 if (!entry
->buflist
) {
742 mutex_unlock(&dev
->struct_mutex
);
743 atomic_dec(&dev
->buf_alloc
);
746 memset(entry
->buflist
, 0, count
* sizeof(*entry
->buflist
));
748 entry
->seglist
= drm_alloc(count
* sizeof(*entry
->seglist
),
750 if (!entry
->seglist
) {
751 drm_free(entry
->buflist
,
752 count
* sizeof(*entry
->buflist
), DRM_MEM_BUFS
);
753 mutex_unlock(&dev
->struct_mutex
);
754 atomic_dec(&dev
->buf_alloc
);
757 memset(entry
->seglist
, 0, count
* sizeof(*entry
->seglist
));
759 /* Keep the original pagelist until we know all the allocations
762 temp_pagelist
= drm_alloc((dma
->page_count
+ (count
<< page_order
))
763 * sizeof(*dma
->pagelist
), DRM_MEM_PAGES
);
764 if (!temp_pagelist
) {
765 drm_free(entry
->buflist
,
766 count
* sizeof(*entry
->buflist
), DRM_MEM_BUFS
);
767 drm_free(entry
->seglist
,
768 count
* sizeof(*entry
->seglist
), DRM_MEM_SEGS
);
769 mutex_unlock(&dev
->struct_mutex
);
770 atomic_dec(&dev
->buf_alloc
);
773 memcpy(temp_pagelist
,
774 dma
->pagelist
, dma
->page_count
* sizeof(*dma
->pagelist
));
775 DRM_DEBUG("pagelist: %d entries\n",
776 dma
->page_count
+ (count
<< page_order
));
778 entry
->buf_size
= size
;
779 entry
->page_order
= page_order
;
783 while (entry
->buf_count
< count
) {
784 page
= drm_alloc_pages(page_order
, DRM_MEM_DMA
);
786 /* Set count correctly so we free the proper amount. */
787 entry
->buf_count
= count
;
788 entry
->seg_count
= count
;
789 drm_cleanup_buf_error(dev
, entry
);
790 drm_free(temp_pagelist
,
791 (dma
->page_count
+ (count
<< page_order
))
792 * sizeof(*dma
->pagelist
), DRM_MEM_PAGES
);
793 mutex_unlock(&dev
->struct_mutex
);
794 atomic_dec(&dev
->buf_alloc
);
797 entry
->seglist
[entry
->seg_count
++] = page
;
798 for (i
= 0; i
< (1 << page_order
); i
++) {
799 DRM_DEBUG("page %d @ 0x%08lx\n",
800 dma
->page_count
+ page_count
,
801 page
+ PAGE_SIZE
* i
);
802 temp_pagelist
[dma
->page_count
+ page_count
++]
803 = page
+ PAGE_SIZE
* i
;
806 offset
+ size
<= total
&& entry
->buf_count
< count
;
807 offset
+= alignment
, ++entry
->buf_count
) {
808 buf
= &entry
->buflist
[entry
->buf_count
];
809 buf
->idx
= dma
->buf_count
+ entry
->buf_count
;
810 buf
->total
= alignment
;
813 buf
->offset
= (dma
->byte_count
+ byte_count
+ offset
);
814 buf
->address
= (void *)(page
+ offset
);
818 init_waitqueue_head(&buf
->dma_wait
);
821 buf
->dev_priv_size
= dev
->driver
->dev_priv_size
;
822 buf
->dev_private
= drm_alloc(buf
->dev_priv_size
,
824 if (!buf
->dev_private
) {
825 /* Set count correctly so we free the proper amount. */
826 entry
->buf_count
= count
;
827 entry
->seg_count
= count
;
828 drm_cleanup_buf_error(dev
, entry
);
829 drm_free(temp_pagelist
,
831 (count
<< page_order
))
832 * sizeof(*dma
->pagelist
),
834 mutex_unlock(&dev
->struct_mutex
);
835 atomic_dec(&dev
->buf_alloc
);
838 memset(buf
->dev_private
, 0, buf
->dev_priv_size
);
840 DRM_DEBUG("buffer %d @ %p\n",
841 entry
->buf_count
, buf
->address
);
843 byte_count
+= PAGE_SIZE
<< page_order
;
846 temp_buflist
= drm_realloc(dma
->buflist
,
847 dma
->buf_count
* sizeof(*dma
->buflist
),
848 (dma
->buf_count
+ entry
->buf_count
)
849 * sizeof(*dma
->buflist
), DRM_MEM_BUFS
);
851 /* Free the entry because it isn't valid */
852 drm_cleanup_buf_error(dev
, entry
);
853 drm_free(temp_pagelist
,
854 (dma
->page_count
+ (count
<< page_order
))
855 * sizeof(*dma
->pagelist
), DRM_MEM_PAGES
);
856 mutex_unlock(&dev
->struct_mutex
);
857 atomic_dec(&dev
->buf_alloc
);
860 dma
->buflist
= temp_buflist
;
862 for (i
= 0; i
< entry
->buf_count
; i
++) {
863 dma
->buflist
[i
+ dma
->buf_count
] = &entry
->buflist
[i
];
866 /* No allocations failed, so now we can replace the orginal pagelist
869 if (dma
->page_count
) {
870 drm_free(dma
->pagelist
,
871 dma
->page_count
* sizeof(*dma
->pagelist
),
874 dma
->pagelist
= temp_pagelist
;
876 dma
->buf_count
+= entry
->buf_count
;
877 dma
->seg_count
+= entry
->seg_count
;
878 dma
->page_count
+= entry
->seg_count
<< page_order
;
879 dma
->byte_count
+= PAGE_SIZE
* (entry
->seg_count
<< page_order
);
881 mutex_unlock(&dev
->struct_mutex
);
883 request
->count
= entry
->buf_count
;
884 request
->size
= size
;
886 atomic_dec(&dev
->buf_alloc
);
890 EXPORT_SYMBOL(drm_addbufs_pci
);
892 static int drm_addbufs_sg(drm_device_t
* dev
, drm_buf_desc_t
* request
)
894 drm_device_dma_t
*dma
= dev
->dma
;
895 drm_buf_entry_t
*entry
;
897 unsigned long offset
;
898 unsigned long agp_offset
;
907 drm_buf_t
**temp_buflist
;
909 if (!drm_core_check_feature(dev
, DRIVER_SG
))
915 if (!capable(CAP_SYS_ADMIN
))
918 count
= request
->count
;
919 order
= drm_order(request
->size
);
922 alignment
= (request
->flags
& _DRM_PAGE_ALIGN
)
923 ? PAGE_ALIGN(size
) : size
;
924 page_order
= order
- PAGE_SHIFT
> 0 ? order
- PAGE_SHIFT
: 0;
925 total
= PAGE_SIZE
<< page_order
;
928 agp_offset
= request
->agp_start
;
930 DRM_DEBUG("count: %d\n", count
);
931 DRM_DEBUG("order: %d\n", order
);
932 DRM_DEBUG("size: %d\n", size
);
933 DRM_DEBUG("agp_offset: %lu\n", agp_offset
);
934 DRM_DEBUG("alignment: %d\n", alignment
);
935 DRM_DEBUG("page_order: %d\n", page_order
);
936 DRM_DEBUG("total: %d\n", total
);
938 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
940 if (dev
->queue_count
)
941 return -EBUSY
; /* Not while in use */
943 spin_lock(&dev
->count_lock
);
945 spin_unlock(&dev
->count_lock
);
948 atomic_inc(&dev
->buf_alloc
);
949 spin_unlock(&dev
->count_lock
);
951 mutex_lock(&dev
->struct_mutex
);
952 entry
= &dma
->bufs
[order
];
953 if (entry
->buf_count
) {
954 mutex_unlock(&dev
->struct_mutex
);
955 atomic_dec(&dev
->buf_alloc
);
956 return -ENOMEM
; /* May only call once for each order */
959 if (count
< 0 || count
> 4096) {
960 mutex_unlock(&dev
->struct_mutex
);
961 atomic_dec(&dev
->buf_alloc
);
965 entry
->buflist
= drm_alloc(count
* sizeof(*entry
->buflist
),
967 if (!entry
->buflist
) {
968 mutex_unlock(&dev
->struct_mutex
);
969 atomic_dec(&dev
->buf_alloc
);
972 memset(entry
->buflist
, 0, count
* sizeof(*entry
->buflist
));
974 entry
->buf_size
= size
;
975 entry
->page_order
= page_order
;
979 while (entry
->buf_count
< count
) {
980 buf
= &entry
->buflist
[entry
->buf_count
];
981 buf
->idx
= dma
->buf_count
+ entry
->buf_count
;
982 buf
->total
= alignment
;
986 buf
->offset
= (dma
->byte_count
+ offset
);
987 buf
->bus_address
= agp_offset
+ offset
;
988 buf
->address
= (void *)(agp_offset
+ offset
989 + (unsigned long)dev
->sg
->virtual);
993 init_waitqueue_head(&buf
->dma_wait
);
996 buf
->dev_priv_size
= dev
->driver
->dev_priv_size
;
997 buf
->dev_private
= drm_alloc(buf
->dev_priv_size
, DRM_MEM_BUFS
);
998 if (!buf
->dev_private
) {
999 /* Set count correctly so we free the proper amount. */
1000 entry
->buf_count
= count
;
1001 drm_cleanup_buf_error(dev
, entry
);
1002 mutex_unlock(&dev
->struct_mutex
);
1003 atomic_dec(&dev
->buf_alloc
);
1007 memset(buf
->dev_private
, 0, buf
->dev_priv_size
);
1009 DRM_DEBUG("buffer %d @ %p\n", entry
->buf_count
, buf
->address
);
1011 offset
+= alignment
;
1013 byte_count
+= PAGE_SIZE
<< page_order
;
1016 DRM_DEBUG("byte_count: %d\n", byte_count
);
1018 temp_buflist
= drm_realloc(dma
->buflist
,
1019 dma
->buf_count
* sizeof(*dma
->buflist
),
1020 (dma
->buf_count
+ entry
->buf_count
)
1021 * sizeof(*dma
->buflist
), DRM_MEM_BUFS
);
1022 if (!temp_buflist
) {
1023 /* Free the entry because it isn't valid */
1024 drm_cleanup_buf_error(dev
, entry
);
1025 mutex_unlock(&dev
->struct_mutex
);
1026 atomic_dec(&dev
->buf_alloc
);
1029 dma
->buflist
= temp_buflist
;
1031 for (i
= 0; i
< entry
->buf_count
; i
++) {
1032 dma
->buflist
[i
+ dma
->buf_count
] = &entry
->buflist
[i
];
1035 dma
->buf_count
+= entry
->buf_count
;
1036 dma
->seg_count
+= entry
->seg_count
;
1037 dma
->page_count
+= byte_count
>> PAGE_SHIFT
;
1038 dma
->byte_count
+= byte_count
;
1040 DRM_DEBUG("dma->buf_count : %d\n", dma
->buf_count
);
1041 DRM_DEBUG("entry->buf_count : %d\n", entry
->buf_count
);
1043 mutex_unlock(&dev
->struct_mutex
);
1045 request
->count
= entry
->buf_count
;
1046 request
->size
= size
;
1048 dma
->flags
= _DRM_DMA_USE_SG
;
1050 atomic_dec(&dev
->buf_alloc
);
1054 int drm_addbufs_fb(drm_device_t
* dev
, drm_buf_desc_t
* request
)
1056 drm_device_dma_t
*dma
= dev
->dma
;
1057 drm_buf_entry_t
*entry
;
1059 unsigned long offset
;
1060 unsigned long agp_offset
;
1069 drm_buf_t
**temp_buflist
;
1071 if (!drm_core_check_feature(dev
, DRIVER_FB_DMA
))
1077 if (!capable(CAP_SYS_ADMIN
))
1080 count
= request
->count
;
1081 order
= drm_order(request
->size
);
1084 alignment
= (request
->flags
& _DRM_PAGE_ALIGN
)
1085 ? PAGE_ALIGN(size
) : size
;
1086 page_order
= order
- PAGE_SHIFT
> 0 ? order
- PAGE_SHIFT
: 0;
1087 total
= PAGE_SIZE
<< page_order
;
1090 agp_offset
= request
->agp_start
;
1092 DRM_DEBUG("count: %d\n", count
);
1093 DRM_DEBUG("order: %d\n", order
);
1094 DRM_DEBUG("size: %d\n", size
);
1095 DRM_DEBUG("agp_offset: %lu\n", agp_offset
);
1096 DRM_DEBUG("alignment: %d\n", alignment
);
1097 DRM_DEBUG("page_order: %d\n", page_order
);
1098 DRM_DEBUG("total: %d\n", total
);
1100 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
1102 if (dev
->queue_count
)
1103 return -EBUSY
; /* Not while in use */
1105 spin_lock(&dev
->count_lock
);
1107 spin_unlock(&dev
->count_lock
);
1110 atomic_inc(&dev
->buf_alloc
);
1111 spin_unlock(&dev
->count_lock
);
1113 mutex_lock(&dev
->struct_mutex
);
1114 entry
= &dma
->bufs
[order
];
1115 if (entry
->buf_count
) {
1116 mutex_unlock(&dev
->struct_mutex
);
1117 atomic_dec(&dev
->buf_alloc
);
1118 return -ENOMEM
; /* May only call once for each order */
1121 if (count
< 0 || count
> 4096) {
1122 mutex_unlock(&dev
->struct_mutex
);
1123 atomic_dec(&dev
->buf_alloc
);
1127 entry
->buflist
= drm_alloc(count
* sizeof(*entry
->buflist
),
1129 if (!entry
->buflist
) {
1130 mutex_unlock(&dev
->struct_mutex
);
1131 atomic_dec(&dev
->buf_alloc
);
1134 memset(entry
->buflist
, 0, count
* sizeof(*entry
->buflist
));
1136 entry
->buf_size
= size
;
1137 entry
->page_order
= page_order
;
1141 while (entry
->buf_count
< count
) {
1142 buf
= &entry
->buflist
[entry
->buf_count
];
1143 buf
->idx
= dma
->buf_count
+ entry
->buf_count
;
1144 buf
->total
= alignment
;
1148 buf
->offset
= (dma
->byte_count
+ offset
);
1149 buf
->bus_address
= agp_offset
+ offset
;
1150 buf
->address
= (void *)(agp_offset
+ offset
);
1154 init_waitqueue_head(&buf
->dma_wait
);
1157 buf
->dev_priv_size
= dev
->driver
->dev_priv_size
;
1158 buf
->dev_private
= drm_alloc(buf
->dev_priv_size
, DRM_MEM_BUFS
);
1159 if (!buf
->dev_private
) {
1160 /* Set count correctly so we free the proper amount. */
1161 entry
->buf_count
= count
;
1162 drm_cleanup_buf_error(dev
, entry
);
1163 mutex_unlock(&dev
->struct_mutex
);
1164 atomic_dec(&dev
->buf_alloc
);
1167 memset(buf
->dev_private
, 0, buf
->dev_priv_size
);
1169 DRM_DEBUG("buffer %d @ %p\n", entry
->buf_count
, buf
->address
);
1171 offset
+= alignment
;
1173 byte_count
+= PAGE_SIZE
<< page_order
;
1176 DRM_DEBUG("byte_count: %d\n", byte_count
);
1178 temp_buflist
= drm_realloc(dma
->buflist
,
1179 dma
->buf_count
* sizeof(*dma
->buflist
),
1180 (dma
->buf_count
+ entry
->buf_count
)
1181 * sizeof(*dma
->buflist
), DRM_MEM_BUFS
);
1182 if (!temp_buflist
) {
1183 /* Free the entry because it isn't valid */
1184 drm_cleanup_buf_error(dev
, entry
);
1185 mutex_unlock(&dev
->struct_mutex
);
1186 atomic_dec(&dev
->buf_alloc
);
1189 dma
->buflist
= temp_buflist
;
1191 for (i
= 0; i
< entry
->buf_count
; i
++) {
1192 dma
->buflist
[i
+ dma
->buf_count
] = &entry
->buflist
[i
];
1195 dma
->buf_count
+= entry
->buf_count
;
1196 dma
->seg_count
+= entry
->seg_count
;
1197 dma
->page_count
+= byte_count
>> PAGE_SHIFT
;
1198 dma
->byte_count
+= byte_count
;
1200 DRM_DEBUG("dma->buf_count : %d\n", dma
->buf_count
);
1201 DRM_DEBUG("entry->buf_count : %d\n", entry
->buf_count
);
1203 mutex_unlock(&dev
->struct_mutex
);
1205 request
->count
= entry
->buf_count
;
1206 request
->size
= size
;
1208 dma
->flags
= _DRM_DMA_USE_FB
;
1210 atomic_dec(&dev
->buf_alloc
);
1213 EXPORT_SYMBOL(drm_addbufs_fb
);
1217 * Add buffers for DMA transfers (ioctl).
1219 * \param inode device inode.
1220 * \param filp file pointer.
1221 * \param cmd command.
1222 * \param arg pointer to a drm_buf_desc_t request.
1223 * \return zero on success or a negative number on failure.
1225 * According with the memory type specified in drm_buf_desc::flags and the
1226 * build options, it dispatches the call either to addbufs_agp(),
1227 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1228 * PCI memory respectively.
1230 int drm_addbufs(struct inode
*inode
, struct file
*filp
,
1231 unsigned int cmd
, unsigned long arg
)
1233 drm_buf_desc_t request
;
1234 drm_file_t
*priv
= filp
->private_data
;
1235 drm_device_t
*dev
= priv
->head
->dev
;
1238 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1241 if (copy_from_user(&request
, (drm_buf_desc_t __user
*) arg
,
1246 if (request
.flags
& _DRM_AGP_BUFFER
)
1247 ret
= drm_addbufs_agp(dev
, &request
);
1250 if (request
.flags
& _DRM_SG_BUFFER
)
1251 ret
= drm_addbufs_sg(dev
, &request
);
1252 else if (request
.flags
& _DRM_FB_BUFFER
)
1253 ret
= drm_addbufs_fb(dev
, &request
);
1255 ret
= drm_addbufs_pci(dev
, &request
);
1258 if (copy_to_user((void __user
*)arg
, &request
, sizeof(request
))) {
1266 * Get information about the buffer mappings.
1268 * This was originally mean for debugging purposes, or by a sophisticated
1269 * client library to determine how best to use the available buffers (e.g.,
1270 * large buffers can be used for image transfer).
1272 * \param inode device inode.
1273 * \param filp file pointer.
1274 * \param cmd command.
1275 * \param arg pointer to a drm_buf_info structure.
1276 * \return zero on success or a negative number on failure.
1278 * Increments drm_device::buf_use while holding the drm_device::count_lock
1279 * lock, preventing of allocating more buffers after this call. Information
1280 * about each requested buffer is then copied into user space.
1282 int drm_infobufs(struct inode
*inode
, struct file
*filp
,
1283 unsigned int cmd
, unsigned long arg
)
1285 drm_file_t
*priv
= filp
->private_data
;
1286 drm_device_t
*dev
= priv
->head
->dev
;
1287 drm_device_dma_t
*dma
= dev
->dma
;
1288 drm_buf_info_t request
;
1289 drm_buf_info_t __user
*argp
= (void __user
*)arg
;
1293 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1299 spin_lock(&dev
->count_lock
);
1300 if (atomic_read(&dev
->buf_alloc
)) {
1301 spin_unlock(&dev
->count_lock
);
1304 ++dev
->buf_use
; /* Can't allocate more after this call */
1305 spin_unlock(&dev
->count_lock
);
1307 if (copy_from_user(&request
, argp
, sizeof(request
)))
1310 for (i
= 0, count
= 0; i
< DRM_MAX_ORDER
+ 1; i
++) {
1311 if (dma
->bufs
[i
].buf_count
)
1315 DRM_DEBUG("count = %d\n", count
);
1317 if (request
.count
>= count
) {
1318 for (i
= 0, count
= 0; i
< DRM_MAX_ORDER
+ 1; i
++) {
1319 if (dma
->bufs
[i
].buf_count
) {
1320 drm_buf_desc_t __user
*to
=
1321 &request
.list
[count
];
1322 drm_buf_entry_t
*from
= &dma
->bufs
[i
];
1323 drm_freelist_t
*list
= &dma
->bufs
[i
].freelist
;
1324 if (copy_to_user(&to
->count
,
1326 sizeof(from
->buf_count
)) ||
1327 copy_to_user(&to
->size
,
1329 sizeof(from
->buf_size
)) ||
1330 copy_to_user(&to
->low_mark
,
1332 sizeof(list
->low_mark
)) ||
1333 copy_to_user(&to
->high_mark
,
1335 sizeof(list
->high_mark
)))
1338 DRM_DEBUG("%d %d %d %d %d\n",
1340 dma
->bufs
[i
].buf_count
,
1341 dma
->bufs
[i
].buf_size
,
1342 dma
->bufs
[i
].freelist
.low_mark
,
1343 dma
->bufs
[i
].freelist
.high_mark
);
1348 request
.count
= count
;
1350 if (copy_to_user(argp
, &request
, sizeof(request
)))
1357 * Specifies a low and high water mark for buffer allocation
1359 * \param inode device inode.
1360 * \param filp file pointer.
1361 * \param cmd command.
1362 * \param arg a pointer to a drm_buf_desc structure.
1363 * \return zero on success or a negative number on failure.
1365 * Verifies that the size order is bounded between the admissible orders and
1366 * updates the respective drm_device_dma::bufs entry low and high water mark.
1368 * \note This ioctl is deprecated and mostly never used.
1370 int drm_markbufs(struct inode
*inode
, struct file
*filp
,
1371 unsigned int cmd
, unsigned long arg
)
1373 drm_file_t
*priv
= filp
->private_data
;
1374 drm_device_t
*dev
= priv
->head
->dev
;
1375 drm_device_dma_t
*dma
= dev
->dma
;
1376 drm_buf_desc_t request
;
1378 drm_buf_entry_t
*entry
;
1380 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1386 if (copy_from_user(&request
,
1387 (drm_buf_desc_t __user
*) arg
, sizeof(request
)))
1390 DRM_DEBUG("%d, %d, %d\n",
1391 request
.size
, request
.low_mark
, request
.high_mark
);
1392 order
= drm_order(request
.size
);
1393 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
1395 entry
= &dma
->bufs
[order
];
1397 if (request
.low_mark
< 0 || request
.low_mark
> entry
->buf_count
)
1399 if (request
.high_mark
< 0 || request
.high_mark
> entry
->buf_count
)
1402 entry
->freelist
.low_mark
= request
.low_mark
;
1403 entry
->freelist
.high_mark
= request
.high_mark
;
1409 * Unreserve the buffers in list, previously reserved using drmDMA.
1411 * \param inode device inode.
1412 * \param filp file pointer.
1413 * \param cmd command.
1414 * \param arg pointer to a drm_buf_free structure.
1415 * \return zero on success or a negative number on failure.
1417 * Calls free_buffer() for each used buffer.
1418 * This function is primarily used for debugging.
1420 int drm_freebufs(struct inode
*inode
, struct file
*filp
,
1421 unsigned int cmd
, unsigned long arg
)
1423 drm_file_t
*priv
= filp
->private_data
;
1424 drm_device_t
*dev
= priv
->head
->dev
;
1425 drm_device_dma_t
*dma
= dev
->dma
;
1426 drm_buf_free_t request
;
1431 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1437 if (copy_from_user(&request
,
1438 (drm_buf_free_t __user
*) arg
, sizeof(request
)))
1441 DRM_DEBUG("%d\n", request
.count
);
1442 for (i
= 0; i
< request
.count
; i
++) {
1443 if (copy_from_user(&idx
, &request
.list
[i
], sizeof(idx
)))
1445 if (idx
< 0 || idx
>= dma
->buf_count
) {
1446 DRM_ERROR("Index %d (of %d max)\n",
1447 idx
, dma
->buf_count
- 1);
1450 buf
= dma
->buflist
[idx
];
1451 if (buf
->filp
!= filp
) {
1452 DRM_ERROR("Process %d freeing buffer not owned\n",
1456 drm_free_buffer(dev
, buf
);
1463 * Maps all of the DMA buffers into client-virtual space (ioctl).
1465 * \param inode device inode.
1466 * \param filp file pointer.
1467 * \param cmd command.
1468 * \param arg pointer to a drm_buf_map structure.
1469 * \return zero on success or a negative number on failure.
1471 * Maps the AGP or SG buffer region with do_mmap(), and copies information
1472 * about each buffer into user space. The PCI buffers are already mapped on the
1473 * addbufs_pci() call.
1475 int drm_mapbufs(struct inode
*inode
, struct file
*filp
,
1476 unsigned int cmd
, unsigned long arg
)
1478 drm_file_t
*priv
= filp
->private_data
;
1479 drm_device_t
*dev
= priv
->head
->dev
;
1480 drm_device_dma_t
*dma
= dev
->dma
;
1481 drm_buf_map_t __user
*argp
= (void __user
*)arg
;
1484 unsigned long virtual;
1485 unsigned long address
;
1486 drm_buf_map_t request
;
1489 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1495 spin_lock(&dev
->count_lock
);
1496 if (atomic_read(&dev
->buf_alloc
)) {
1497 spin_unlock(&dev
->count_lock
);
1500 dev
->buf_use
++; /* Can't allocate more after this call */
1501 spin_unlock(&dev
->count_lock
);
1503 if (copy_from_user(&request
, argp
, sizeof(request
)))
1506 if (request
.count
>= dma
->buf_count
) {
1507 if ((drm_core_has_AGP(dev
) && (dma
->flags
& _DRM_DMA_USE_AGP
))
1508 || (drm_core_check_feature(dev
, DRIVER_SG
)
1509 && (dma
->flags
& _DRM_DMA_USE_SG
))
1510 || (drm_core_check_feature(dev
, DRIVER_FB_DMA
)
1511 && (dma
->flags
& _DRM_DMA_USE_FB
))) {
1512 drm_map_t
*map
= dev
->agp_buffer_map
;
1513 unsigned long token
= dev
->agp_buffer_token
;
1520 down_write(¤t
->mm
->mmap_sem
);
1521 virtual = do_mmap(filp
, 0, map
->size
,
1522 PROT_READ
| PROT_WRITE
,
1524 up_write(¤t
->mm
->mmap_sem
);
1526 down_write(¤t
->mm
->mmap_sem
);
1527 virtual = do_mmap(filp
, 0, dma
->byte_count
,
1528 PROT_READ
| PROT_WRITE
,
1530 up_write(¤t
->mm
->mmap_sem
);
1532 if (virtual > -1024UL) {
1534 retcode
= (signed long)virtual;
1537 request
.virtual = (void __user
*)virtual;
1539 for (i
= 0; i
< dma
->buf_count
; i
++) {
1540 if (copy_to_user(&request
.list
[i
].idx
,
1541 &dma
->buflist
[i
]->idx
,
1542 sizeof(request
.list
[0].idx
))) {
1546 if (copy_to_user(&request
.list
[i
].total
,
1547 &dma
->buflist
[i
]->total
,
1548 sizeof(request
.list
[0].total
))) {
1552 if (copy_to_user(&request
.list
[i
].used
,
1553 &zero
, sizeof(zero
))) {
1557 address
= virtual + dma
->buflist
[i
]->offset
; /* *** */
1558 if (copy_to_user(&request
.list
[i
].address
,
1559 &address
, sizeof(address
))) {
1566 request
.count
= dma
->buf_count
;
1567 DRM_DEBUG("%d buffers, retcode = %d\n", request
.count
, retcode
);
1569 if (copy_to_user(argp
, &request
, sizeof(request
)))
1576 * Compute size order. Returns the exponent of the smaller power of two which
1577 * is greater or equal to given number.
1582 * \todo Can be made faster.
1584 int drm_order(unsigned long size
)
1589 for (order
= 0, tmp
= size
>> 1; tmp
; tmp
>>= 1, order
++) ;
1591 if (size
& (size
- 1))
1596 EXPORT_SYMBOL(drm_order
);