3 * Generic buffer template
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
10 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
36 #include <linux/vmalloc.h>
37 #include <linux/slab.h>
38 #include <linux/log2.h>
39 #include <asm/shmparam.h>
42 static struct drm_map_list
*drm_find_matching_map(struct drm_device
*dev
,
43 struct drm_local_map
*map
)
45 struct drm_map_list
*entry
;
46 list_for_each_entry(entry
, &dev
->maplist
, head
) {
48 * Because the kernel-userspace ABI is fixed at a 32-bit offset
49 * while PCI resources may live above that, we ignore the map
50 * offset for maps of type _DRM_FRAMEBUFFER or _DRM_REGISTERS.
51 * It is assumed that each driver will have only one resource of
55 map
->type
!= entry
->map
->type
||
56 entry
->master
!= dev
->primary
->master
)
60 if (map
->flags
!= _DRM_CONTAINS_LOCK
)
63 case _DRM_FRAME_BUFFER
:
65 default: /* Make gcc happy */
68 if (entry
->map
->offset
== map
->offset
)
75 static int drm_map_handle(struct drm_device
*dev
, struct drm_hash_item
*hash
,
76 unsigned long user_token
, int hashed_handle
, int shm
)
78 int use_hashed_handle
, shift
;
81 #if (BITS_PER_LONG == 64)
82 use_hashed_handle
= ((user_token
& 0xFFFFFFFF00000000UL
) || hashed_handle
);
83 #elif (BITS_PER_LONG == 32)
84 use_hashed_handle
= hashed_handle
;
86 #error Unsupported long size. Neither 64 nor 32 bits.
89 if (!use_hashed_handle
) {
91 hash
->key
= user_token
>> PAGE_SHIFT
;
92 ret
= drm_ht_insert_item(&dev
->map_hash
, hash
);
98 add
= DRM_MAP_HASH_OFFSET
>> PAGE_SHIFT
;
99 if (shm
&& (SHMLBA
> PAGE_SIZE
)) {
100 int bits
= ilog2(SHMLBA
>> PAGE_SHIFT
) + 1;
102 /* For shared memory, we have to preserve the SHMLBA
103 * bits of the eventual vma->vm_pgoff value during
104 * mmap(). Otherwise we run into cache aliasing problems
105 * on some platforms. On these platforms, the pgoff of
106 * a mmap() request is used to pick a suitable virtual
107 * address for the mmap() region such that it will not
108 * cause cache aliasing problems.
110 * Therefore, make sure the SHMLBA relevant bits of the
111 * hash value we use are equal to those in the original
112 * kernel virtual address.
115 add
|= ((user_token
>> PAGE_SHIFT
) & ((1UL << bits
) - 1UL));
118 return drm_ht_just_insert_please(&dev
->map_hash
, hash
,
119 user_token
, 32 - PAGE_SHIFT
- 3,
124 * Core function to create a range of memory available for mapping by a
127 * Adjusts the memory offset to its absolute value according to the mapping
128 * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where
129 * applicable and if supported by the kernel.
131 static int drm_addmap_core(struct drm_device
* dev
, resource_size_t offset
,
132 unsigned int size
, enum drm_map_type type
,
133 enum drm_map_flags flags
,
134 struct drm_map_list
** maplist
)
136 struct drm_local_map
*map
;
137 struct drm_map_list
*list
;
138 drm_dma_handle_t
*dmah
;
139 unsigned long user_token
;
142 map
= kmalloc(sizeof(*map
), GFP_KERNEL
);
146 map
->offset
= offset
;
151 /* Only allow shared memory to be removable since we only keep enough
152 * book keeping information about shared memory to allow for removal
153 * when processes fork.
155 if ((map
->flags
& _DRM_REMOVABLE
) && map
->type
!= _DRM_SHM
) {
159 DRM_DEBUG("offset = 0x%08llx, size = 0x%08lx, type = %d\n",
160 (unsigned long long)map
->offset
, map
->size
, map
->type
);
162 /* page-align _DRM_SHM maps. They are allocated here so there is no security
163 * hole created by that and it works around various broken drivers that use
164 * a non-aligned quantity to map the SAREA. --BenH
166 if (map
->type
== _DRM_SHM
)
167 map
->size
= PAGE_ALIGN(map
->size
);
169 if ((map
->offset
& (~(resource_size_t
)PAGE_MASK
)) || (map
->size
& (~PAGE_MASK
))) {
178 case _DRM_FRAME_BUFFER
:
179 #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) && !defined(__powerpc64__) && !defined(__x86_64__) && !defined(__arm__)
180 if (map
->offset
+ (map
->size
-1) < map
->offset
||
181 map
->offset
< virt_to_phys(high_memory
)) {
187 map
->offset
+= dev
->hose
->mem_space
->start
;
189 /* Some drivers preinitialize some maps, without the X Server
190 * needing to be aware of it. Therefore, we just return success
191 * when the server tries to create a duplicate map.
193 list
= drm_find_matching_map(dev
, map
);
195 if (list
->map
->size
!= map
->size
) {
196 DRM_DEBUG("Matching maps of type %d with "
197 "mismatched sizes, (%ld vs %ld)\n",
198 map
->type
, map
->size
,
200 list
->map
->size
= map
->size
;
208 if (drm_core_has_MTRR(dev
)) {
209 if (map
->type
== _DRM_FRAME_BUFFER
||
210 (map
->flags
& _DRM_WRITE_COMBINING
)) {
211 map
->mtrr
= mtrr_add(map
->offset
, map
->size
,
212 MTRR_TYPE_WRCOMB
, 1);
215 if (map
->type
== _DRM_REGISTERS
) {
216 map
->handle
= ioremap(map
->offset
, map
->size
);
225 list
= drm_find_matching_map(dev
, map
);
227 if(list
->map
->size
!= map
->size
) {
228 DRM_DEBUG("Matching maps of type %d with "
229 "mismatched sizes, (%ld vs %ld)\n",
230 map
->type
, map
->size
, list
->map
->size
);
231 list
->map
->size
= map
->size
;
238 map
->handle
= vmalloc_user(map
->size
);
239 DRM_DEBUG("%lu %d %p\n",
240 map
->size
, drm_order(map
->size
), map
->handle
);
245 map
->offset
= (unsigned long)map
->handle
;
246 if (map
->flags
& _DRM_CONTAINS_LOCK
) {
247 /* Prevent a 2nd X Server from creating a 2nd lock */
248 if (dev
->primary
->master
->lock
.hw_lock
!= NULL
) {
253 dev
->sigdata
.lock
= dev
->primary
->master
->lock
.hw_lock
= map
->handle
; /* Pointer to lock */
257 struct drm_agp_mem
*entry
;
260 if (!drm_core_has_AGP(dev
)) {
265 map
->offset
+= dev
->hose
->mem_space
->start
;
267 /* In some cases (i810 driver), user space may have already
268 * added the AGP base itself, because dev->agp->base previously
269 * only got set during AGP enable. So, only add the base
270 * address if the map's offset isn't already within the
273 if (map
->offset
< dev
->agp
->base
||
274 map
->offset
> dev
->agp
->base
+
275 dev
->agp
->agp_info
.aper_size
* 1024 * 1024 - 1) {
276 map
->offset
+= dev
->agp
->base
;
278 map
->mtrr
= dev
->agp
->agp_mtrr
; /* for getmap */
280 /* This assumes the DRM is in total control of AGP space.
281 * It's not always the case as AGP can be in the control
282 * of user space (i.e. i810 driver). So this loop will get
283 * skipped and we double check that dev->agp->memory is
284 * actually set as well as being invalid before EPERM'ing
286 list_for_each_entry(entry
, &dev
->agp
->memory
, head
) {
287 if ((map
->offset
>= entry
->bound
) &&
288 (map
->offset
+ map
->size
<= entry
->bound
+ entry
->pages
* PAGE_SIZE
)) {
293 if (!list_empty(&dev
->agp
->memory
) && !valid
) {
297 DRM_DEBUG("AGP offset = 0x%08llx, size = 0x%08lx\n",
298 (unsigned long long)map
->offset
, map
->size
);
303 DRM_ERROR("tried to addmap GEM object\n");
305 case _DRM_SCATTER_GATHER
:
310 map
->offset
+= (unsigned long)dev
->sg
->virtual;
312 case _DRM_CONSISTENT
:
313 /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
314 * As we're limiting the address to 2^32-1 (or less),
315 * casting it down to 32 bits is no problem, but we
316 * need to point to a 64bit variable first. */
317 dmah
= drm_pci_alloc(dev
, map
->size
, map
->size
);
322 map
->handle
= dmah
->vaddr
;
323 map
->offset
= (unsigned long)dmah
->busaddr
;
331 list
= kmalloc(sizeof(*list
), GFP_KERNEL
);
333 if (map
->type
== _DRM_REGISTERS
)
334 iounmap(map
->handle
);
338 memset(list
, 0, sizeof(*list
));
341 mutex_lock(&dev
->struct_mutex
);
342 list_add(&list
->head
, &dev
->maplist
);
344 /* Assign a 32-bit handle */
345 /* We do it here so that dev->struct_mutex protects the increment */
346 user_token
= (map
->type
== _DRM_SHM
) ? (unsigned long)map
->handle
:
348 ret
= drm_map_handle(dev
, &list
->hash
, user_token
, 0,
349 (map
->type
== _DRM_SHM
));
351 if (map
->type
== _DRM_REGISTERS
)
352 iounmap(map
->handle
);
355 mutex_unlock(&dev
->struct_mutex
);
359 list
->user_token
= list
->hash
.key
<< PAGE_SHIFT
;
360 mutex_unlock(&dev
->struct_mutex
);
362 if (!(map
->flags
& _DRM_DRIVER
))
363 list
->master
= dev
->primary
->master
;
368 int drm_addmap(struct drm_device
* dev
, resource_size_t offset
,
369 unsigned int size
, enum drm_map_type type
,
370 enum drm_map_flags flags
, struct drm_local_map
** map_ptr
)
372 struct drm_map_list
*list
;
375 rc
= drm_addmap_core(dev
, offset
, size
, type
, flags
, &list
);
377 *map_ptr
= list
->map
;
381 EXPORT_SYMBOL(drm_addmap
);
384 * Ioctl to specify a range of memory that is available for mapping by a
387 * \param inode device inode.
388 * \param file_priv DRM file private.
389 * \param cmd command.
390 * \param arg pointer to a drm_map structure.
391 * \return zero on success or a negative value on error.
394 int drm_addmap_ioctl(struct drm_device
*dev
, void *data
,
395 struct drm_file
*file_priv
)
397 struct drm_map
*map
= data
;
398 struct drm_map_list
*maplist
;
401 if (!(capable(CAP_SYS_ADMIN
) || map
->type
== _DRM_AGP
|| map
->type
== _DRM_SHM
))
404 err
= drm_addmap_core(dev
, map
->offset
, map
->size
, map
->type
,
405 map
->flags
, &maplist
);
410 /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */
411 map
->handle
= (void *)(unsigned long)maplist
->user_token
;
416 * Remove a map private from list and deallocate resources if the mapping
419 * Searches the map on drm_device::maplist, removes it from the list, see if
420 * its being used, and free any associate resource (such as MTRR's) if it's not
425 int drm_rmmap_locked(struct drm_device
*dev
, struct drm_local_map
*map
)
427 struct drm_map_list
*r_list
= NULL
, *list_t
;
428 drm_dma_handle_t dmah
;
430 struct drm_master
*master
;
432 /* Find the list entry for the map and remove it */
433 list_for_each_entry_safe(r_list
, list_t
, &dev
->maplist
, head
) {
434 if (r_list
->map
== map
) {
435 master
= r_list
->master
;
436 list_del(&r_list
->head
);
437 drm_ht_remove_key(&dev
->map_hash
,
438 r_list
->user_token
>> PAGE_SHIFT
);
450 iounmap(map
->handle
);
452 case _DRM_FRAME_BUFFER
:
453 if (drm_core_has_MTRR(dev
) && map
->mtrr
>= 0) {
455 retcode
= mtrr_del(map
->mtrr
, map
->offset
, map
->size
);
456 DRM_DEBUG("mtrr_del=%d\n", retcode
);
462 if (dev
->sigdata
.lock
== master
->lock
.hw_lock
)
463 dev
->sigdata
.lock
= NULL
;
464 master
->lock
.hw_lock
= NULL
; /* SHM removed */
465 master
->lock
.file_priv
= NULL
;
466 wake_up_interruptible_all(&master
->lock
.lock_queue
);
470 case _DRM_SCATTER_GATHER
:
472 case _DRM_CONSISTENT
:
473 dmah
.vaddr
= map
->handle
;
474 dmah
.busaddr
= map
->offset
;
475 dmah
.size
= map
->size
;
476 __drm_pci_free(dev
, &dmah
);
479 DRM_ERROR("tried to rmmap GEM object\n");
486 EXPORT_SYMBOL(drm_rmmap_locked
);
488 int drm_rmmap(struct drm_device
*dev
, struct drm_local_map
*map
)
492 mutex_lock(&dev
->struct_mutex
);
493 ret
= drm_rmmap_locked(dev
, map
);
494 mutex_unlock(&dev
->struct_mutex
);
498 EXPORT_SYMBOL(drm_rmmap
);
500 /* The rmmap ioctl appears to be unnecessary. All mappings are torn down on
501 * the last close of the device, and this is necessary for cleanup when things
502 * exit uncleanly. Therefore, having userland manually remove mappings seems
503 * like a pointless exercise since they're going away anyway.
505 * One use case might be after addmap is allowed for normal users for SHM and
506 * gets used by drivers that the server doesn't need to care about. This seems
509 * \param inode device inode.
510 * \param file_priv DRM file private.
511 * \param cmd command.
512 * \param arg pointer to a struct drm_map structure.
513 * \return zero on success or a negative value on error.
515 int drm_rmmap_ioctl(struct drm_device
*dev
, void *data
,
516 struct drm_file
*file_priv
)
518 struct drm_map
*request
= data
;
519 struct drm_local_map
*map
= NULL
;
520 struct drm_map_list
*r_list
;
523 mutex_lock(&dev
->struct_mutex
);
524 list_for_each_entry(r_list
, &dev
->maplist
, head
) {
526 r_list
->user_token
== (unsigned long)request
->handle
&&
527 r_list
->map
->flags
& _DRM_REMOVABLE
) {
533 /* List has wrapped around to the head pointer, or its empty we didn't
536 if (list_empty(&dev
->maplist
) || !map
) {
537 mutex_unlock(&dev
->struct_mutex
);
541 /* Register and framebuffer maps are permanent */
542 if ((map
->type
== _DRM_REGISTERS
) || (map
->type
== _DRM_FRAME_BUFFER
)) {
543 mutex_unlock(&dev
->struct_mutex
);
547 ret
= drm_rmmap_locked(dev
, map
);
549 mutex_unlock(&dev
->struct_mutex
);
555 * Cleanup after an error on one of the addbufs() functions.
557 * \param dev DRM device.
558 * \param entry buffer entry where the error occurred.
560 * Frees any pages and buffers associated with the given entry.
562 static void drm_cleanup_buf_error(struct drm_device
* dev
,
563 struct drm_buf_entry
* entry
)
567 if (entry
->seg_count
) {
568 for (i
= 0; i
< entry
->seg_count
; i
++) {
569 if (entry
->seglist
[i
]) {
570 drm_pci_free(dev
, entry
->seglist
[i
]);
573 kfree(entry
->seglist
);
575 entry
->seg_count
= 0;
578 if (entry
->buf_count
) {
579 for (i
= 0; i
< entry
->buf_count
; i
++) {
580 kfree(entry
->buflist
[i
].dev_private
);
582 kfree(entry
->buflist
);
584 entry
->buf_count
= 0;
590 * Add AGP buffers for DMA transfers.
592 * \param dev struct drm_device to which the buffers are to be added.
593 * \param request pointer to a struct drm_buf_desc describing the request.
594 * \return zero on success or a negative number on failure.
596 * After some sanity checks creates a drm_buf structure for each buffer and
597 * reallocates the buffer list of the same size order to accommodate the new
600 int drm_addbufs_agp(struct drm_device
* dev
, struct drm_buf_desc
* request
)
602 struct drm_device_dma
*dma
= dev
->dma
;
603 struct drm_buf_entry
*entry
;
604 struct drm_agp_mem
*agp_entry
;
606 unsigned long offset
;
607 unsigned long agp_offset
;
616 struct drm_buf
**temp_buflist
;
621 count
= request
->count
;
622 order
= drm_order(request
->size
);
625 alignment
= (request
->flags
& _DRM_PAGE_ALIGN
)
626 ? PAGE_ALIGN(size
) : size
;
627 page_order
= order
- PAGE_SHIFT
> 0 ? order
- PAGE_SHIFT
: 0;
628 total
= PAGE_SIZE
<< page_order
;
631 agp_offset
= dev
->agp
->base
+ request
->agp_start
;
633 DRM_DEBUG("count: %d\n", count
);
634 DRM_DEBUG("order: %d\n", order
);
635 DRM_DEBUG("size: %d\n", size
);
636 DRM_DEBUG("agp_offset: %lx\n", agp_offset
);
637 DRM_DEBUG("alignment: %d\n", alignment
);
638 DRM_DEBUG("page_order: %d\n", page_order
);
639 DRM_DEBUG("total: %d\n", total
);
641 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
643 if (dev
->queue_count
)
644 return -EBUSY
; /* Not while in use */
646 /* Make sure buffers are located in AGP memory that we own */
648 list_for_each_entry(agp_entry
, &dev
->agp
->memory
, head
) {
649 if ((agp_offset
>= agp_entry
->bound
) &&
650 (agp_offset
+ total
* count
<= agp_entry
->bound
+ agp_entry
->pages
* PAGE_SIZE
)) {
655 if (!list_empty(&dev
->agp
->memory
) && !valid
) {
656 DRM_DEBUG("zone invalid\n");
659 spin_lock(&dev
->count_lock
);
661 spin_unlock(&dev
->count_lock
);
664 atomic_inc(&dev
->buf_alloc
);
665 spin_unlock(&dev
->count_lock
);
667 mutex_lock(&dev
->struct_mutex
);
668 entry
= &dma
->bufs
[order
];
669 if (entry
->buf_count
) {
670 mutex_unlock(&dev
->struct_mutex
);
671 atomic_dec(&dev
->buf_alloc
);
672 return -ENOMEM
; /* May only call once for each order */
675 if (count
< 0 || count
> 4096) {
676 mutex_unlock(&dev
->struct_mutex
);
677 atomic_dec(&dev
->buf_alloc
);
681 entry
->buflist
= kmalloc(count
* sizeof(*entry
->buflist
), GFP_KERNEL
);
682 if (!entry
->buflist
) {
683 mutex_unlock(&dev
->struct_mutex
);
684 atomic_dec(&dev
->buf_alloc
);
687 memset(entry
->buflist
, 0, count
* sizeof(*entry
->buflist
));
689 entry
->buf_size
= size
;
690 entry
->page_order
= page_order
;
694 while (entry
->buf_count
< count
) {
695 buf
= &entry
->buflist
[entry
->buf_count
];
696 buf
->idx
= dma
->buf_count
+ entry
->buf_count
;
697 buf
->total
= alignment
;
701 buf
->offset
= (dma
->byte_count
+ offset
);
702 buf
->bus_address
= agp_offset
+ offset
;
703 buf
->address
= (void *)(agp_offset
+ offset
);
707 init_waitqueue_head(&buf
->dma_wait
);
708 buf
->file_priv
= NULL
;
710 buf
->dev_priv_size
= dev
->driver
->dev_priv_size
;
711 buf
->dev_private
= kmalloc(buf
->dev_priv_size
, GFP_KERNEL
);
712 if (!buf
->dev_private
) {
713 /* Set count correctly so we free the proper amount. */
714 entry
->buf_count
= count
;
715 drm_cleanup_buf_error(dev
, entry
);
716 mutex_unlock(&dev
->struct_mutex
);
717 atomic_dec(&dev
->buf_alloc
);
720 memset(buf
->dev_private
, 0, buf
->dev_priv_size
);
722 DRM_DEBUG("buffer %d @ %p\n", entry
->buf_count
, buf
->address
);
726 byte_count
+= PAGE_SIZE
<< page_order
;
729 DRM_DEBUG("byte_count: %d\n", byte_count
);
731 temp_buflist
= krealloc(dma
->buflist
,
732 (dma
->buf_count
+ entry
->buf_count
) *
733 sizeof(*dma
->buflist
), GFP_KERNEL
);
735 /* Free the entry because it isn't valid */
736 drm_cleanup_buf_error(dev
, entry
);
737 mutex_unlock(&dev
->struct_mutex
);
738 atomic_dec(&dev
->buf_alloc
);
741 dma
->buflist
= temp_buflist
;
743 for (i
= 0; i
< entry
->buf_count
; i
++) {
744 dma
->buflist
[i
+ dma
->buf_count
] = &entry
->buflist
[i
];
747 dma
->buf_count
+= entry
->buf_count
;
748 dma
->seg_count
+= entry
->seg_count
;
749 dma
->page_count
+= byte_count
>> PAGE_SHIFT
;
750 dma
->byte_count
+= byte_count
;
752 DRM_DEBUG("dma->buf_count : %d\n", dma
->buf_count
);
753 DRM_DEBUG("entry->buf_count : %d\n", entry
->buf_count
);
755 mutex_unlock(&dev
->struct_mutex
);
757 request
->count
= entry
->buf_count
;
758 request
->size
= size
;
760 dma
->flags
= _DRM_DMA_USE_AGP
;
762 atomic_dec(&dev
->buf_alloc
);
765 EXPORT_SYMBOL(drm_addbufs_agp
);
766 #endif /* __OS_HAS_AGP */
768 int drm_addbufs_pci(struct drm_device
* dev
, struct drm_buf_desc
* request
)
770 struct drm_device_dma
*dma
= dev
->dma
;
776 struct drm_buf_entry
*entry
;
777 drm_dma_handle_t
*dmah
;
780 unsigned long offset
;
784 unsigned long *temp_pagelist
;
785 struct drm_buf
**temp_buflist
;
787 if (!drm_core_check_feature(dev
, DRIVER_PCI_DMA
))
793 if (!capable(CAP_SYS_ADMIN
))
796 count
= request
->count
;
797 order
= drm_order(request
->size
);
800 DRM_DEBUG("count=%d, size=%d (%d), order=%d, queue_count=%d\n",
801 request
->count
, request
->size
, size
, order
, dev
->queue_count
);
803 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
805 if (dev
->queue_count
)
806 return -EBUSY
; /* Not while in use */
808 alignment
= (request
->flags
& _DRM_PAGE_ALIGN
)
809 ? PAGE_ALIGN(size
) : size
;
810 page_order
= order
- PAGE_SHIFT
> 0 ? order
- PAGE_SHIFT
: 0;
811 total
= PAGE_SIZE
<< page_order
;
813 spin_lock(&dev
->count_lock
);
815 spin_unlock(&dev
->count_lock
);
818 atomic_inc(&dev
->buf_alloc
);
819 spin_unlock(&dev
->count_lock
);
821 mutex_lock(&dev
->struct_mutex
);
822 entry
= &dma
->bufs
[order
];
823 if (entry
->buf_count
) {
824 mutex_unlock(&dev
->struct_mutex
);
825 atomic_dec(&dev
->buf_alloc
);
826 return -ENOMEM
; /* May only call once for each order */
829 if (count
< 0 || count
> 4096) {
830 mutex_unlock(&dev
->struct_mutex
);
831 atomic_dec(&dev
->buf_alloc
);
835 entry
->buflist
= kmalloc(count
* sizeof(*entry
->buflist
), GFP_KERNEL
);
836 if (!entry
->buflist
) {
837 mutex_unlock(&dev
->struct_mutex
);
838 atomic_dec(&dev
->buf_alloc
);
841 memset(entry
->buflist
, 0, count
* sizeof(*entry
->buflist
));
843 entry
->seglist
= kmalloc(count
* sizeof(*entry
->seglist
), GFP_KERNEL
);
844 if (!entry
->seglist
) {
845 kfree(entry
->buflist
);
846 mutex_unlock(&dev
->struct_mutex
);
847 atomic_dec(&dev
->buf_alloc
);
850 memset(entry
->seglist
, 0, count
* sizeof(*entry
->seglist
));
852 /* Keep the original pagelist until we know all the allocations
855 temp_pagelist
= kmalloc((dma
->page_count
+ (count
<< page_order
)) *
856 sizeof(*dma
->pagelist
), GFP_KERNEL
);
857 if (!temp_pagelist
) {
858 kfree(entry
->buflist
);
859 kfree(entry
->seglist
);
860 mutex_unlock(&dev
->struct_mutex
);
861 atomic_dec(&dev
->buf_alloc
);
864 memcpy(temp_pagelist
,
865 dma
->pagelist
, dma
->page_count
* sizeof(*dma
->pagelist
));
866 DRM_DEBUG("pagelist: %d entries\n",
867 dma
->page_count
+ (count
<< page_order
));
869 entry
->buf_size
= size
;
870 entry
->page_order
= page_order
;
874 while (entry
->buf_count
< count
) {
876 dmah
= drm_pci_alloc(dev
, PAGE_SIZE
<< page_order
, 0x1000);
879 /* Set count correctly so we free the proper amount. */
880 entry
->buf_count
= count
;
881 entry
->seg_count
= count
;
882 drm_cleanup_buf_error(dev
, entry
);
883 kfree(temp_pagelist
);
884 mutex_unlock(&dev
->struct_mutex
);
885 atomic_dec(&dev
->buf_alloc
);
888 entry
->seglist
[entry
->seg_count
++] = dmah
;
889 for (i
= 0; i
< (1 << page_order
); i
++) {
890 DRM_DEBUG("page %d @ 0x%08lx\n",
891 dma
->page_count
+ page_count
,
892 (unsigned long)dmah
->vaddr
+ PAGE_SIZE
* i
);
893 temp_pagelist
[dma
->page_count
+ page_count
++]
894 = (unsigned long)dmah
->vaddr
+ PAGE_SIZE
* i
;
897 offset
+ size
<= total
&& entry
->buf_count
< count
;
898 offset
+= alignment
, ++entry
->buf_count
) {
899 buf
= &entry
->buflist
[entry
->buf_count
];
900 buf
->idx
= dma
->buf_count
+ entry
->buf_count
;
901 buf
->total
= alignment
;
904 buf
->offset
= (dma
->byte_count
+ byte_count
+ offset
);
905 buf
->address
= (void *)(dmah
->vaddr
+ offset
);
906 buf
->bus_address
= dmah
->busaddr
+ offset
;
910 init_waitqueue_head(&buf
->dma_wait
);
911 buf
->file_priv
= NULL
;
913 buf
->dev_priv_size
= dev
->driver
->dev_priv_size
;
914 buf
->dev_private
= kmalloc(buf
->dev_priv_size
,
916 if (!buf
->dev_private
) {
917 /* Set count correctly so we free the proper amount. */
918 entry
->buf_count
= count
;
919 entry
->seg_count
= count
;
920 drm_cleanup_buf_error(dev
, entry
);
921 kfree(temp_pagelist
);
922 mutex_unlock(&dev
->struct_mutex
);
923 atomic_dec(&dev
->buf_alloc
);
926 memset(buf
->dev_private
, 0, buf
->dev_priv_size
);
928 DRM_DEBUG("buffer %d @ %p\n",
929 entry
->buf_count
, buf
->address
);
931 byte_count
+= PAGE_SIZE
<< page_order
;
934 temp_buflist
= krealloc(dma
->buflist
,
935 (dma
->buf_count
+ entry
->buf_count
) *
936 sizeof(*dma
->buflist
), GFP_KERNEL
);
938 /* Free the entry because it isn't valid */
939 drm_cleanup_buf_error(dev
, entry
);
940 kfree(temp_pagelist
);
941 mutex_unlock(&dev
->struct_mutex
);
942 atomic_dec(&dev
->buf_alloc
);
945 dma
->buflist
= temp_buflist
;
947 for (i
= 0; i
< entry
->buf_count
; i
++) {
948 dma
->buflist
[i
+ dma
->buf_count
] = &entry
->buflist
[i
];
951 /* No allocations failed, so now we can replace the original pagelist
954 if (dma
->page_count
) {
955 kfree(dma
->pagelist
);
957 dma
->pagelist
= temp_pagelist
;
959 dma
->buf_count
+= entry
->buf_count
;
960 dma
->seg_count
+= entry
->seg_count
;
961 dma
->page_count
+= entry
->seg_count
<< page_order
;
962 dma
->byte_count
+= PAGE_SIZE
* (entry
->seg_count
<< page_order
);
964 mutex_unlock(&dev
->struct_mutex
);
966 request
->count
= entry
->buf_count
;
967 request
->size
= size
;
969 if (request
->flags
& _DRM_PCI_BUFFER_RO
)
970 dma
->flags
= _DRM_DMA_USE_PCI_RO
;
972 atomic_dec(&dev
->buf_alloc
);
976 EXPORT_SYMBOL(drm_addbufs_pci
);
978 static int drm_addbufs_sg(struct drm_device
* dev
, struct drm_buf_desc
* request
)
980 struct drm_device_dma
*dma
= dev
->dma
;
981 struct drm_buf_entry
*entry
;
983 unsigned long offset
;
984 unsigned long agp_offset
;
993 struct drm_buf
**temp_buflist
;
995 if (!drm_core_check_feature(dev
, DRIVER_SG
))
1001 if (!capable(CAP_SYS_ADMIN
))
1004 count
= request
->count
;
1005 order
= drm_order(request
->size
);
1008 alignment
= (request
->flags
& _DRM_PAGE_ALIGN
)
1009 ? PAGE_ALIGN(size
) : size
;
1010 page_order
= order
- PAGE_SHIFT
> 0 ? order
- PAGE_SHIFT
: 0;
1011 total
= PAGE_SIZE
<< page_order
;
1014 agp_offset
= request
->agp_start
;
1016 DRM_DEBUG("count: %d\n", count
);
1017 DRM_DEBUG("order: %d\n", order
);
1018 DRM_DEBUG("size: %d\n", size
);
1019 DRM_DEBUG("agp_offset: %lu\n", agp_offset
);
1020 DRM_DEBUG("alignment: %d\n", alignment
);
1021 DRM_DEBUG("page_order: %d\n", page_order
);
1022 DRM_DEBUG("total: %d\n", total
);
1024 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
1026 if (dev
->queue_count
)
1027 return -EBUSY
; /* Not while in use */
1029 spin_lock(&dev
->count_lock
);
1031 spin_unlock(&dev
->count_lock
);
1034 atomic_inc(&dev
->buf_alloc
);
1035 spin_unlock(&dev
->count_lock
);
1037 mutex_lock(&dev
->struct_mutex
);
1038 entry
= &dma
->bufs
[order
];
1039 if (entry
->buf_count
) {
1040 mutex_unlock(&dev
->struct_mutex
);
1041 atomic_dec(&dev
->buf_alloc
);
1042 return -ENOMEM
; /* May only call once for each order */
1045 if (count
< 0 || count
> 4096) {
1046 mutex_unlock(&dev
->struct_mutex
);
1047 atomic_dec(&dev
->buf_alloc
);
1051 entry
->buflist
= kmalloc(count
* sizeof(*entry
->buflist
),
1053 if (!entry
->buflist
) {
1054 mutex_unlock(&dev
->struct_mutex
);
1055 atomic_dec(&dev
->buf_alloc
);
1058 memset(entry
->buflist
, 0, count
* sizeof(*entry
->buflist
));
1060 entry
->buf_size
= size
;
1061 entry
->page_order
= page_order
;
1065 while (entry
->buf_count
< count
) {
1066 buf
= &entry
->buflist
[entry
->buf_count
];
1067 buf
->idx
= dma
->buf_count
+ entry
->buf_count
;
1068 buf
->total
= alignment
;
1072 buf
->offset
= (dma
->byte_count
+ offset
);
1073 buf
->bus_address
= agp_offset
+ offset
;
1074 buf
->address
= (void *)(agp_offset
+ offset
1075 + (unsigned long)dev
->sg
->virtual);
1079 init_waitqueue_head(&buf
->dma_wait
);
1080 buf
->file_priv
= NULL
;
1082 buf
->dev_priv_size
= dev
->driver
->dev_priv_size
;
1083 buf
->dev_private
= kmalloc(buf
->dev_priv_size
, GFP_KERNEL
);
1084 if (!buf
->dev_private
) {
1085 /* Set count correctly so we free the proper amount. */
1086 entry
->buf_count
= count
;
1087 drm_cleanup_buf_error(dev
, entry
);
1088 mutex_unlock(&dev
->struct_mutex
);
1089 atomic_dec(&dev
->buf_alloc
);
1093 memset(buf
->dev_private
, 0, buf
->dev_priv_size
);
1095 DRM_DEBUG("buffer %d @ %p\n", entry
->buf_count
, buf
->address
);
1097 offset
+= alignment
;
1099 byte_count
+= PAGE_SIZE
<< page_order
;
1102 DRM_DEBUG("byte_count: %d\n", byte_count
);
1104 temp_buflist
= krealloc(dma
->buflist
,
1105 (dma
->buf_count
+ entry
->buf_count
) *
1106 sizeof(*dma
->buflist
), GFP_KERNEL
);
1107 if (!temp_buflist
) {
1108 /* Free the entry because it isn't valid */
1109 drm_cleanup_buf_error(dev
, entry
);
1110 mutex_unlock(&dev
->struct_mutex
);
1111 atomic_dec(&dev
->buf_alloc
);
1114 dma
->buflist
= temp_buflist
;
1116 for (i
= 0; i
< entry
->buf_count
; i
++) {
1117 dma
->buflist
[i
+ dma
->buf_count
] = &entry
->buflist
[i
];
1120 dma
->buf_count
+= entry
->buf_count
;
1121 dma
->seg_count
+= entry
->seg_count
;
1122 dma
->page_count
+= byte_count
>> PAGE_SHIFT
;
1123 dma
->byte_count
+= byte_count
;
1125 DRM_DEBUG("dma->buf_count : %d\n", dma
->buf_count
);
1126 DRM_DEBUG("entry->buf_count : %d\n", entry
->buf_count
);
1128 mutex_unlock(&dev
->struct_mutex
);
1130 request
->count
= entry
->buf_count
;
1131 request
->size
= size
;
1133 dma
->flags
= _DRM_DMA_USE_SG
;
1135 atomic_dec(&dev
->buf_alloc
);
1139 static int drm_addbufs_fb(struct drm_device
* dev
, struct drm_buf_desc
* request
)
1141 struct drm_device_dma
*dma
= dev
->dma
;
1142 struct drm_buf_entry
*entry
;
1143 struct drm_buf
*buf
;
1144 unsigned long offset
;
1145 unsigned long agp_offset
;
1154 struct drm_buf
**temp_buflist
;
1156 if (!drm_core_check_feature(dev
, DRIVER_FB_DMA
))
1162 if (!capable(CAP_SYS_ADMIN
))
1165 count
= request
->count
;
1166 order
= drm_order(request
->size
);
1169 alignment
= (request
->flags
& _DRM_PAGE_ALIGN
)
1170 ? PAGE_ALIGN(size
) : size
;
1171 page_order
= order
- PAGE_SHIFT
> 0 ? order
- PAGE_SHIFT
: 0;
1172 total
= PAGE_SIZE
<< page_order
;
1175 agp_offset
= request
->agp_start
;
1177 DRM_DEBUG("count: %d\n", count
);
1178 DRM_DEBUG("order: %d\n", order
);
1179 DRM_DEBUG("size: %d\n", size
);
1180 DRM_DEBUG("agp_offset: %lu\n", agp_offset
);
1181 DRM_DEBUG("alignment: %d\n", alignment
);
1182 DRM_DEBUG("page_order: %d\n", page_order
);
1183 DRM_DEBUG("total: %d\n", total
);
1185 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
1187 if (dev
->queue_count
)
1188 return -EBUSY
; /* Not while in use */
1190 spin_lock(&dev
->count_lock
);
1192 spin_unlock(&dev
->count_lock
);
1195 atomic_inc(&dev
->buf_alloc
);
1196 spin_unlock(&dev
->count_lock
);
1198 mutex_lock(&dev
->struct_mutex
);
1199 entry
= &dma
->bufs
[order
];
1200 if (entry
->buf_count
) {
1201 mutex_unlock(&dev
->struct_mutex
);
1202 atomic_dec(&dev
->buf_alloc
);
1203 return -ENOMEM
; /* May only call once for each order */
1206 if (count
< 0 || count
> 4096) {
1207 mutex_unlock(&dev
->struct_mutex
);
1208 atomic_dec(&dev
->buf_alloc
);
1212 entry
->buflist
= kmalloc(count
* sizeof(*entry
->buflist
),
1214 if (!entry
->buflist
) {
1215 mutex_unlock(&dev
->struct_mutex
);
1216 atomic_dec(&dev
->buf_alloc
);
1219 memset(entry
->buflist
, 0, count
* sizeof(*entry
->buflist
));
1221 entry
->buf_size
= size
;
1222 entry
->page_order
= page_order
;
1226 while (entry
->buf_count
< count
) {
1227 buf
= &entry
->buflist
[entry
->buf_count
];
1228 buf
->idx
= dma
->buf_count
+ entry
->buf_count
;
1229 buf
->total
= alignment
;
1233 buf
->offset
= (dma
->byte_count
+ offset
);
1234 buf
->bus_address
= agp_offset
+ offset
;
1235 buf
->address
= (void *)(agp_offset
+ offset
);
1239 init_waitqueue_head(&buf
->dma_wait
);
1240 buf
->file_priv
= NULL
;
1242 buf
->dev_priv_size
= dev
->driver
->dev_priv_size
;
1243 buf
->dev_private
= kmalloc(buf
->dev_priv_size
, GFP_KERNEL
);
1244 if (!buf
->dev_private
) {
1245 /* Set count correctly so we free the proper amount. */
1246 entry
->buf_count
= count
;
1247 drm_cleanup_buf_error(dev
, entry
);
1248 mutex_unlock(&dev
->struct_mutex
);
1249 atomic_dec(&dev
->buf_alloc
);
1252 memset(buf
->dev_private
, 0, buf
->dev_priv_size
);
1254 DRM_DEBUG("buffer %d @ %p\n", entry
->buf_count
, buf
->address
);
1256 offset
+= alignment
;
1258 byte_count
+= PAGE_SIZE
<< page_order
;
1261 DRM_DEBUG("byte_count: %d\n", byte_count
);
1263 temp_buflist
= krealloc(dma
->buflist
,
1264 (dma
->buf_count
+ entry
->buf_count
) *
1265 sizeof(*dma
->buflist
), GFP_KERNEL
);
1266 if (!temp_buflist
) {
1267 /* Free the entry because it isn't valid */
1268 drm_cleanup_buf_error(dev
, entry
);
1269 mutex_unlock(&dev
->struct_mutex
);
1270 atomic_dec(&dev
->buf_alloc
);
1273 dma
->buflist
= temp_buflist
;
1275 for (i
= 0; i
< entry
->buf_count
; i
++) {
1276 dma
->buflist
[i
+ dma
->buf_count
] = &entry
->buflist
[i
];
1279 dma
->buf_count
+= entry
->buf_count
;
1280 dma
->seg_count
+= entry
->seg_count
;
1281 dma
->page_count
+= byte_count
>> PAGE_SHIFT
;
1282 dma
->byte_count
+= byte_count
;
1284 DRM_DEBUG("dma->buf_count : %d\n", dma
->buf_count
);
1285 DRM_DEBUG("entry->buf_count : %d\n", entry
->buf_count
);
1287 mutex_unlock(&dev
->struct_mutex
);
1289 request
->count
= entry
->buf_count
;
1290 request
->size
= size
;
1292 dma
->flags
= _DRM_DMA_USE_FB
;
1294 atomic_dec(&dev
->buf_alloc
);
1300 * Add buffers for DMA transfers (ioctl).
1302 * \param inode device inode.
1303 * \param file_priv DRM file private.
1304 * \param cmd command.
1305 * \param arg pointer to a struct drm_buf_desc request.
1306 * \return zero on success or a negative number on failure.
1308 * According with the memory type specified in drm_buf_desc::flags and the
1309 * build options, it dispatches the call either to addbufs_agp(),
1310 * addbufs_sg() or addbufs_pci() for AGP, scatter-gather or consistent
1311 * PCI memory respectively.
1313 int drm_addbufs(struct drm_device
*dev
, void *data
,
1314 struct drm_file
*file_priv
)
1316 struct drm_buf_desc
*request
= data
;
1319 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1323 if (request
->flags
& _DRM_AGP_BUFFER
)
1324 ret
= drm_addbufs_agp(dev
, request
);
1327 if (request
->flags
& _DRM_SG_BUFFER
)
1328 ret
= drm_addbufs_sg(dev
, request
);
1329 else if (request
->flags
& _DRM_FB_BUFFER
)
1330 ret
= drm_addbufs_fb(dev
, request
);
1332 ret
= drm_addbufs_pci(dev
, request
);
1338 * Get information about the buffer mappings.
1340 * This was originally mean for debugging purposes, or by a sophisticated
1341 * client library to determine how best to use the available buffers (e.g.,
1342 * large buffers can be used for image transfer).
1344 * \param inode device inode.
1345 * \param file_priv DRM file private.
1346 * \param cmd command.
1347 * \param arg pointer to a drm_buf_info structure.
1348 * \return zero on success or a negative number on failure.
1350 * Increments drm_device::buf_use while holding the drm_device::count_lock
1351 * lock, preventing of allocating more buffers after this call. Information
1352 * about each requested buffer is then copied into user space.
1354 int drm_infobufs(struct drm_device
*dev
, void *data
,
1355 struct drm_file
*file_priv
)
1357 struct drm_device_dma
*dma
= dev
->dma
;
1358 struct drm_buf_info
*request
= data
;
1362 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1368 spin_lock(&dev
->count_lock
);
1369 if (atomic_read(&dev
->buf_alloc
)) {
1370 spin_unlock(&dev
->count_lock
);
1373 ++dev
->buf_use
; /* Can't allocate more after this call */
1374 spin_unlock(&dev
->count_lock
);
1376 for (i
= 0, count
= 0; i
< DRM_MAX_ORDER
+ 1; i
++) {
1377 if (dma
->bufs
[i
].buf_count
)
1381 DRM_DEBUG("count = %d\n", count
);
1383 if (request
->count
>= count
) {
1384 for (i
= 0, count
= 0; i
< DRM_MAX_ORDER
+ 1; i
++) {
1385 if (dma
->bufs
[i
].buf_count
) {
1386 struct drm_buf_desc __user
*to
=
1387 &request
->list
[count
];
1388 struct drm_buf_entry
*from
= &dma
->bufs
[i
];
1389 struct drm_freelist
*list
= &dma
->bufs
[i
].freelist
;
1390 if (copy_to_user(&to
->count
,
1392 sizeof(from
->buf_count
)) ||
1393 copy_to_user(&to
->size
,
1395 sizeof(from
->buf_size
)) ||
1396 copy_to_user(&to
->low_mark
,
1398 sizeof(list
->low_mark
)) ||
1399 copy_to_user(&to
->high_mark
,
1401 sizeof(list
->high_mark
)))
1404 DRM_DEBUG("%d %d %d %d %d\n",
1406 dma
->bufs
[i
].buf_count
,
1407 dma
->bufs
[i
].buf_size
,
1408 dma
->bufs
[i
].freelist
.low_mark
,
1409 dma
->bufs
[i
].freelist
.high_mark
);
1414 request
->count
= count
;
1420 * Specifies a low and high water mark for buffer allocation
1422 * \param inode device inode.
1423 * \param file_priv DRM file private.
1424 * \param cmd command.
1425 * \param arg a pointer to a drm_buf_desc structure.
1426 * \return zero on success or a negative number on failure.
1428 * Verifies that the size order is bounded between the admissible orders and
1429 * updates the respective drm_device_dma::bufs entry low and high water mark.
1431 * \note This ioctl is deprecated and mostly never used.
1433 int drm_markbufs(struct drm_device
*dev
, void *data
,
1434 struct drm_file
*file_priv
)
1436 struct drm_device_dma
*dma
= dev
->dma
;
1437 struct drm_buf_desc
*request
= data
;
1439 struct drm_buf_entry
*entry
;
1441 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1447 DRM_DEBUG("%d, %d, %d\n",
1448 request
->size
, request
->low_mark
, request
->high_mark
);
1449 order
= drm_order(request
->size
);
1450 if (order
< DRM_MIN_ORDER
|| order
> DRM_MAX_ORDER
)
1452 entry
= &dma
->bufs
[order
];
1454 if (request
->low_mark
< 0 || request
->low_mark
> entry
->buf_count
)
1456 if (request
->high_mark
< 0 || request
->high_mark
> entry
->buf_count
)
1459 entry
->freelist
.low_mark
= request
->low_mark
;
1460 entry
->freelist
.high_mark
= request
->high_mark
;
1466 * Unreserve the buffers in list, previously reserved using drmDMA.
1468 * \param inode device inode.
1469 * \param file_priv DRM file private.
1470 * \param cmd command.
1471 * \param arg pointer to a drm_buf_free structure.
1472 * \return zero on success or a negative number on failure.
1474 * Calls free_buffer() for each used buffer.
1475 * This function is primarily used for debugging.
1477 int drm_freebufs(struct drm_device
*dev
, void *data
,
1478 struct drm_file
*file_priv
)
1480 struct drm_device_dma
*dma
= dev
->dma
;
1481 struct drm_buf_free
*request
= data
;
1484 struct drm_buf
*buf
;
1486 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1492 DRM_DEBUG("%d\n", request
->count
);
1493 for (i
= 0; i
< request
->count
; i
++) {
1494 if (copy_from_user(&idx
, &request
->list
[i
], sizeof(idx
)))
1496 if (idx
< 0 || idx
>= dma
->buf_count
) {
1497 DRM_ERROR("Index %d (of %d max)\n",
1498 idx
, dma
->buf_count
- 1);
1501 buf
= dma
->buflist
[idx
];
1502 if (buf
->file_priv
!= file_priv
) {
1503 DRM_ERROR("Process %d freeing buffer not owned\n",
1504 task_pid_nr(current
));
1507 drm_free_buffer(dev
, buf
);
1514 * Maps all of the DMA buffers into client-virtual space (ioctl).
1516 * \param inode device inode.
1517 * \param file_priv DRM file private.
1518 * \param cmd command.
1519 * \param arg pointer to a drm_buf_map structure.
1520 * \return zero on success or a negative number on failure.
1522 * Maps the AGP, SG or PCI buffer region with do_mmap(), and copies information
1523 * about each buffer into user space. For PCI buffers, it calls do_mmap() with
1524 * offset equal to 0, which drm_mmap() interpretes as PCI buffers and calls
1527 int drm_mapbufs(struct drm_device
*dev
, void *data
,
1528 struct drm_file
*file_priv
)
1530 struct drm_device_dma
*dma
= dev
->dma
;
1533 unsigned long virtual;
1534 unsigned long address
;
1535 struct drm_buf_map
*request
= data
;
1538 if (!drm_core_check_feature(dev
, DRIVER_HAVE_DMA
))
1544 spin_lock(&dev
->count_lock
);
1545 if (atomic_read(&dev
->buf_alloc
)) {
1546 spin_unlock(&dev
->count_lock
);
1549 dev
->buf_use
++; /* Can't allocate more after this call */
1550 spin_unlock(&dev
->count_lock
);
1552 if (request
->count
>= dma
->buf_count
) {
1553 if ((drm_core_has_AGP(dev
) && (dma
->flags
& _DRM_DMA_USE_AGP
))
1554 || (drm_core_check_feature(dev
, DRIVER_SG
)
1555 && (dma
->flags
& _DRM_DMA_USE_SG
))
1556 || (drm_core_check_feature(dev
, DRIVER_FB_DMA
)
1557 && (dma
->flags
& _DRM_DMA_USE_FB
))) {
1558 struct drm_local_map
*map
= dev
->agp_buffer_map
;
1559 unsigned long token
= dev
->agp_buffer_token
;
1565 down_write(¤t
->mm
->mmap_sem
);
1566 virtual = do_mmap(file_priv
->filp
, 0, map
->size
,
1567 PROT_READ
| PROT_WRITE
,
1570 up_write(¤t
->mm
->mmap_sem
);
1572 down_write(¤t
->mm
->mmap_sem
);
1573 virtual = do_mmap(file_priv
->filp
, 0, dma
->byte_count
,
1574 PROT_READ
| PROT_WRITE
,
1576 up_write(¤t
->mm
->mmap_sem
);
1578 if (virtual > -1024UL) {
1580 retcode
= (signed long)virtual;
1583 request
->virtual = (void __user
*)virtual;
1585 for (i
= 0; i
< dma
->buf_count
; i
++) {
1586 if (copy_to_user(&request
->list
[i
].idx
,
1587 &dma
->buflist
[i
]->idx
,
1588 sizeof(request
->list
[0].idx
))) {
1592 if (copy_to_user(&request
->list
[i
].total
,
1593 &dma
->buflist
[i
]->total
,
1594 sizeof(request
->list
[0].total
))) {
1598 if (copy_to_user(&request
->list
[i
].used
,
1599 &zero
, sizeof(zero
))) {
1603 address
= virtual + dma
->buflist
[i
]->offset
; /* *** */
1604 if (copy_to_user(&request
->list
[i
].address
,
1605 &address
, sizeof(address
))) {
1612 request
->count
= dma
->buf_count
;
1613 DRM_DEBUG("%d buffers, retcode = %d\n", request
->count
, retcode
);
1619 * Compute size order. Returns the exponent of the smaller power of two which
1620 * is greater or equal to given number.
1625 * \todo Can be made faster.
1627 int drm_order(unsigned long size
)
1632 for (order
= 0, tmp
= size
>> 1; tmp
; tmp
>>= 1, order
++) ;
1634 if (size
& (size
- 1))
1639 EXPORT_SYMBOL(drm_order
);
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