2 * Dynamic DMA mapping support.
4 * This implementation is a fallback for platforms that do not support
5 * I/O TLBs (aka DMA address translation hardware).
6 * Copyright (C) 2000 Asit Mallick <Asit.K.Mallick@intel.com>
7 * Copyright (C) 2000 Goutham Rao <goutham.rao@intel.com>
8 * Copyright (C) 2000, 2003 Hewlett-Packard Co
9 * David Mosberger-Tang <davidm@hpl.hp.com>
11 * 03/05/07 davidm Switch from PCI-DMA to generic device DMA API.
12 * 00/12/13 davidm Rename to swiotlb.c and add mark_clean() to avoid
13 * unnecessary i-cache flushing.
14 * 04/07/.. ak Better overflow handling. Assorted fixes.
15 * 05/09/10 linville Add support for syncing ranges, support syncing for
16 * DMA_BIDIRECTIONAL mappings, miscellaneous cleanup.
19 #include <linux/cache.h>
20 #include <linux/dma-mapping.h>
22 #include <linux/module.h>
23 #include <linux/spinlock.h>
24 #include <linux/string.h>
25 #include <linux/types.h>
26 #include <linux/ctype.h>
30 #include <asm/scatterlist.h>
32 #include <linux/init.h>
33 #include <linux/bootmem.h>
34 #include <linux/iommu-helper.h>
36 #define OFFSET(val,align) ((unsigned long) \
37 ( (val) & ( (align) - 1)))
39 #define SG_ENT_VIRT_ADDRESS(sg) (sg_virt((sg)))
40 #define SG_ENT_PHYS_ADDRESS(sg) virt_to_bus(SG_ENT_VIRT_ADDRESS(sg))
43 * Maximum allowable number of contiguous slabs to map,
44 * must be a power of 2. What is the appropriate value ?
45 * The complexity of {map,unmap}_single is linearly dependent on this value.
47 #define IO_TLB_SEGSIZE 128
50 * log of the size of each IO TLB slab. The number of slabs is command line
53 #define IO_TLB_SHIFT 11
55 #define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
58 * Minimum IO TLB size to bother booting with. Systems with mainly
59 * 64bit capable cards will only lightly use the swiotlb. If we can't
60 * allocate a contiguous 1MB, we're probably in trouble anyway.
62 #define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
65 * Enumeration for sync targets
67 enum dma_sync_target
{
75 * Used to do a quick range check in swiotlb_unmap_single and
76 * swiotlb_sync_single_*, to see if the memory was in fact allocated by this
79 static char *io_tlb_start
, *io_tlb_end
;
82 * The number of IO TLB blocks (in groups of 64) betweeen io_tlb_start and
83 * io_tlb_end. This is command line adjustable via setup_io_tlb_npages.
85 static unsigned long io_tlb_nslabs
;
88 * When the IOMMU overflows we return a fallback buffer. This sets the size.
90 static unsigned long io_tlb_overflow
= 32*1024;
92 void *io_tlb_overflow_buffer
;
95 * This is a free list describing the number of free entries available from
98 static unsigned int *io_tlb_list
;
99 static unsigned int io_tlb_index
;
102 * We need to save away the original address corresponding to a mapped entry
103 * for the sync operations.
105 static unsigned char **io_tlb_orig_addr
;
108 * Protect the above data structures in the map and unmap calls
110 static DEFINE_SPINLOCK(io_tlb_lock
);
113 setup_io_tlb_npages(char *str
)
116 io_tlb_nslabs
= simple_strtoul(str
, &str
, 0);
117 /* avoid tail segment of size < IO_TLB_SEGSIZE */
118 io_tlb_nslabs
= ALIGN(io_tlb_nslabs
, IO_TLB_SEGSIZE
);
122 if (!strcmp(str
, "force"))
126 __setup("swiotlb=", setup_io_tlb_npages
);
127 /* make io_tlb_overflow tunable too? */
130 * Statically reserve bounce buffer space and initialize bounce buffer data
131 * structures for the software IO TLB used to implement the DMA API.
134 swiotlb_init_with_default_size(size_t default_size
)
136 unsigned long i
, bytes
;
138 if (!io_tlb_nslabs
) {
139 io_tlb_nslabs
= (default_size
>> IO_TLB_SHIFT
);
140 io_tlb_nslabs
= ALIGN(io_tlb_nslabs
, IO_TLB_SEGSIZE
);
143 bytes
= io_tlb_nslabs
<< IO_TLB_SHIFT
;
146 * Get IO TLB memory from the low pages
148 io_tlb_start
= alloc_bootmem_low_pages(bytes
);
150 panic("Cannot allocate SWIOTLB buffer");
151 io_tlb_end
= io_tlb_start
+ bytes
;
154 * Allocate and initialize the free list array. This array is used
155 * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
156 * between io_tlb_start and io_tlb_end.
158 io_tlb_list
= alloc_bootmem(io_tlb_nslabs
* sizeof(int));
159 for (i
= 0; i
< io_tlb_nslabs
; i
++)
160 io_tlb_list
[i
] = IO_TLB_SEGSIZE
- OFFSET(i
, IO_TLB_SEGSIZE
);
162 io_tlb_orig_addr
= alloc_bootmem(io_tlb_nslabs
* sizeof(char *));
165 * Get the overflow emergency buffer
167 io_tlb_overflow_buffer
= alloc_bootmem_low(io_tlb_overflow
);
168 if (!io_tlb_overflow_buffer
)
169 panic("Cannot allocate SWIOTLB overflow buffer!\n");
171 printk(KERN_INFO
"Placing software IO TLB between 0x%lx - 0x%lx\n",
172 virt_to_bus(io_tlb_start
), virt_to_bus(io_tlb_end
));
178 swiotlb_init_with_default_size(64 * (1<<20)); /* default to 64MB */
182 * Systems with larger DMA zones (those that don't support ISA) can
183 * initialize the swiotlb later using the slab allocator if needed.
184 * This should be just like above, but with some error catching.
187 swiotlb_late_init_with_default_size(size_t default_size
)
189 unsigned long i
, bytes
, req_nslabs
= io_tlb_nslabs
;
192 if (!io_tlb_nslabs
) {
193 io_tlb_nslabs
= (default_size
>> IO_TLB_SHIFT
);
194 io_tlb_nslabs
= ALIGN(io_tlb_nslabs
, IO_TLB_SEGSIZE
);
198 * Get IO TLB memory from the low pages
200 order
= get_order(io_tlb_nslabs
<< IO_TLB_SHIFT
);
201 io_tlb_nslabs
= SLABS_PER_PAGE
<< order
;
202 bytes
= io_tlb_nslabs
<< IO_TLB_SHIFT
;
204 while ((SLABS_PER_PAGE
<< order
) > IO_TLB_MIN_SLABS
) {
205 io_tlb_start
= (char *)__get_free_pages(GFP_DMA
| __GFP_NOWARN
,
215 if (order
!= get_order(bytes
)) {
216 printk(KERN_WARNING
"Warning: only able to allocate %ld MB "
217 "for software IO TLB\n", (PAGE_SIZE
<< order
) >> 20);
218 io_tlb_nslabs
= SLABS_PER_PAGE
<< order
;
219 bytes
= io_tlb_nslabs
<< IO_TLB_SHIFT
;
221 io_tlb_end
= io_tlb_start
+ bytes
;
222 memset(io_tlb_start
, 0, bytes
);
225 * Allocate and initialize the free list array. This array is used
226 * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
227 * between io_tlb_start and io_tlb_end.
229 io_tlb_list
= (unsigned int *)__get_free_pages(GFP_KERNEL
,
230 get_order(io_tlb_nslabs
* sizeof(int)));
234 for (i
= 0; i
< io_tlb_nslabs
; i
++)
235 io_tlb_list
[i
] = IO_TLB_SEGSIZE
- OFFSET(i
, IO_TLB_SEGSIZE
);
238 io_tlb_orig_addr
= (unsigned char **)__get_free_pages(GFP_KERNEL
,
239 get_order(io_tlb_nslabs
* sizeof(char *)));
240 if (!io_tlb_orig_addr
)
243 memset(io_tlb_orig_addr
, 0, io_tlb_nslabs
* sizeof(char *));
246 * Get the overflow emergency buffer
248 io_tlb_overflow_buffer
= (void *)__get_free_pages(GFP_DMA
,
249 get_order(io_tlb_overflow
));
250 if (!io_tlb_overflow_buffer
)
253 printk(KERN_INFO
"Placing %luMB software IO TLB between 0x%lx - "
254 "0x%lx\n", bytes
>> 20,
255 virt_to_bus(io_tlb_start
), virt_to_bus(io_tlb_end
));
260 free_pages((unsigned long)io_tlb_orig_addr
, get_order(io_tlb_nslabs
*
262 io_tlb_orig_addr
= NULL
;
264 free_pages((unsigned long)io_tlb_list
, get_order(io_tlb_nslabs
*
269 free_pages((unsigned long)io_tlb_start
, order
);
272 io_tlb_nslabs
= req_nslabs
;
277 address_needs_mapping(struct device
*hwdev
, dma_addr_t addr
, size_t size
)
279 dma_addr_t mask
= 0xffffffff;
280 /* If the device has a mask, use it, otherwise default to 32 bits */
281 if (hwdev
&& hwdev
->dma_mask
)
282 mask
= *hwdev
->dma_mask
;
283 return !is_buffer_dma_capable(mask
, addr
, size
);
286 static int is_swiotlb_buffer(char *addr
)
288 return addr
>= io_tlb_start
&& addr
< io_tlb_end
;
292 * Allocates bounce buffer and returns its kernel virtual address.
295 map_single(struct device
*hwdev
, char *buffer
, size_t size
, int dir
)
299 unsigned int nslots
, stride
, index
, wrap
;
301 unsigned long start_dma_addr
;
303 unsigned long offset_slots
;
304 unsigned long max_slots
;
306 mask
= dma_get_seg_boundary(hwdev
);
307 start_dma_addr
= virt_to_bus(io_tlb_start
) & mask
;
309 offset_slots
= ALIGN(start_dma_addr
, 1 << IO_TLB_SHIFT
) >> IO_TLB_SHIFT
;
311 ? ALIGN(mask
+ 1, 1 << IO_TLB_SHIFT
) >> IO_TLB_SHIFT
312 : 1UL << (BITS_PER_LONG
- IO_TLB_SHIFT
);
315 * For mappings greater than a page, we limit the stride (and
316 * hence alignment) to a page size.
318 nslots
= ALIGN(size
, 1 << IO_TLB_SHIFT
) >> IO_TLB_SHIFT
;
319 if (size
> PAGE_SIZE
)
320 stride
= (1 << (PAGE_SHIFT
- IO_TLB_SHIFT
));
327 * Find suitable number of IO TLB entries size that will fit this
328 * request and allocate a buffer from that IO TLB pool.
330 spin_lock_irqsave(&io_tlb_lock
, flags
);
331 index
= ALIGN(io_tlb_index
, stride
);
332 if (index
>= io_tlb_nslabs
)
337 while (iommu_is_span_boundary(index
, nslots
, offset_slots
,
340 if (index
>= io_tlb_nslabs
)
347 * If we find a slot that indicates we have 'nslots' number of
348 * contiguous buffers, we allocate the buffers from that slot
349 * and mark the entries as '0' indicating unavailable.
351 if (io_tlb_list
[index
] >= nslots
) {
354 for (i
= index
; i
< (int) (index
+ nslots
); i
++)
356 for (i
= index
- 1; (OFFSET(i
, IO_TLB_SEGSIZE
) != IO_TLB_SEGSIZE
- 1) && io_tlb_list
[i
]; i
--)
357 io_tlb_list
[i
] = ++count
;
358 dma_addr
= io_tlb_start
+ (index
<< IO_TLB_SHIFT
);
361 * Update the indices to avoid searching in the next
364 io_tlb_index
= ((index
+ nslots
) < io_tlb_nslabs
365 ? (index
+ nslots
) : 0);
370 if (index
>= io_tlb_nslabs
)
372 } while (index
!= wrap
);
375 spin_unlock_irqrestore(&io_tlb_lock
, flags
);
378 spin_unlock_irqrestore(&io_tlb_lock
, flags
);
381 * Save away the mapping from the original address to the DMA address.
382 * This is needed when we sync the memory. Then we sync the buffer if
385 for (i
= 0; i
< nslots
; i
++)
386 io_tlb_orig_addr
[index
+i
] = buffer
+ (i
<< IO_TLB_SHIFT
);
387 if (dir
== DMA_TO_DEVICE
|| dir
== DMA_BIDIRECTIONAL
)
388 memcpy(dma_addr
, buffer
, size
);
394 * dma_addr is the kernel virtual address of the bounce buffer to unmap.
397 unmap_single(struct device
*hwdev
, char *dma_addr
, size_t size
, int dir
)
400 int i
, count
, nslots
= ALIGN(size
, 1 << IO_TLB_SHIFT
) >> IO_TLB_SHIFT
;
401 int index
= (dma_addr
- io_tlb_start
) >> IO_TLB_SHIFT
;
402 char *buffer
= io_tlb_orig_addr
[index
];
405 * First, sync the memory before unmapping the entry
407 if (buffer
&& ((dir
== DMA_FROM_DEVICE
) || (dir
== DMA_BIDIRECTIONAL
)))
409 * bounce... copy the data back into the original buffer * and
410 * delete the bounce buffer.
412 memcpy(buffer
, dma_addr
, size
);
415 * Return the buffer to the free list by setting the corresponding
416 * entries to indicate the number of contigous entries available.
417 * While returning the entries to the free list, we merge the entries
418 * with slots below and above the pool being returned.
420 spin_lock_irqsave(&io_tlb_lock
, flags
);
422 count
= ((index
+ nslots
) < ALIGN(index
+ 1, IO_TLB_SEGSIZE
) ?
423 io_tlb_list
[index
+ nslots
] : 0);
425 * Step 1: return the slots to the free list, merging the
426 * slots with superceeding slots
428 for (i
= index
+ nslots
- 1; i
>= index
; i
--)
429 io_tlb_list
[i
] = ++count
;
431 * Step 2: merge the returned slots with the preceding slots,
432 * if available (non zero)
434 for (i
= index
- 1; (OFFSET(i
, IO_TLB_SEGSIZE
) != IO_TLB_SEGSIZE
-1) && io_tlb_list
[i
]; i
--)
435 io_tlb_list
[i
] = ++count
;
437 spin_unlock_irqrestore(&io_tlb_lock
, flags
);
441 sync_single(struct device
*hwdev
, char *dma_addr
, size_t size
,
444 int index
= (dma_addr
- io_tlb_start
) >> IO_TLB_SHIFT
;
445 char *buffer
= io_tlb_orig_addr
[index
];
447 buffer
+= ((unsigned long)dma_addr
& ((1 << IO_TLB_SHIFT
) - 1));
451 if (likely(dir
== DMA_FROM_DEVICE
|| dir
== DMA_BIDIRECTIONAL
))
452 memcpy(buffer
, dma_addr
, size
);
454 BUG_ON(dir
!= DMA_TO_DEVICE
);
456 case SYNC_FOR_DEVICE
:
457 if (likely(dir
== DMA_TO_DEVICE
|| dir
== DMA_BIDIRECTIONAL
))
458 memcpy(dma_addr
, buffer
, size
);
460 BUG_ON(dir
!= DMA_FROM_DEVICE
);
468 swiotlb_alloc_coherent(struct device
*hwdev
, size_t size
,
469 dma_addr_t
*dma_handle
, gfp_t flags
)
473 int order
= get_order(size
);
475 ret
= (void *)__get_free_pages(flags
, order
);
476 if (ret
&& address_needs_mapping(hwdev
, virt_to_bus(ret
), size
)) {
478 * The allocated memory isn't reachable by the device.
479 * Fall back on swiotlb_map_single().
481 free_pages((unsigned long) ret
, order
);
486 * We are either out of memory or the device can't DMA
487 * to GFP_DMA memory; fall back on
488 * swiotlb_map_single(), which will grab memory from
489 * the lowest available address range.
491 ret
= map_single(hwdev
, NULL
, size
, DMA_FROM_DEVICE
);
496 memset(ret
, 0, size
);
497 dev_addr
= virt_to_bus(ret
);
499 /* Confirm address can be DMA'd by device */
500 if (address_needs_mapping(hwdev
, dev_addr
, size
)) {
501 printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
502 (unsigned long long)*hwdev
->dma_mask
,
503 (unsigned long long)dev_addr
);
504 panic("swiotlb_alloc_coherent: allocated memory is out of "
507 *dma_handle
= dev_addr
;
512 swiotlb_free_coherent(struct device
*hwdev
, size_t size
, void *vaddr
,
513 dma_addr_t dma_handle
)
515 WARN_ON(irqs_disabled());
516 if (!is_swiotlb_buffer(vaddr
))
517 free_pages((unsigned long) vaddr
, get_order(size
));
519 /* DMA_TO_DEVICE to avoid memcpy in unmap_single */
520 unmap_single(hwdev
, vaddr
, size
, DMA_TO_DEVICE
);
524 swiotlb_full(struct device
*dev
, size_t size
, int dir
, int do_panic
)
527 * Ran out of IOMMU space for this operation. This is very bad.
528 * Unfortunately the drivers cannot handle this operation properly.
529 * unless they check for dma_mapping_error (most don't)
530 * When the mapping is small enough return a static buffer to limit
531 * the damage, or panic when the transfer is too big.
533 printk(KERN_ERR
"DMA: Out of SW-IOMMU space for %zu bytes at "
534 "device %s\n", size
, dev
? dev
->bus_id
: "?");
536 if (size
> io_tlb_overflow
&& do_panic
) {
537 if (dir
== DMA_FROM_DEVICE
|| dir
== DMA_BIDIRECTIONAL
)
538 panic("DMA: Memory would be corrupted\n");
539 if (dir
== DMA_TO_DEVICE
|| dir
== DMA_BIDIRECTIONAL
)
540 panic("DMA: Random memory would be DMAed\n");
545 * Map a single buffer of the indicated size for DMA in streaming mode. The
546 * physical address to use is returned.
548 * Once the device is given the dma address, the device owns this memory until
549 * either swiotlb_unmap_single or swiotlb_dma_sync_single is performed.
552 swiotlb_map_single_attrs(struct device
*hwdev
, void *ptr
, size_t size
,
553 int dir
, struct dma_attrs
*attrs
)
555 dma_addr_t dev_addr
= virt_to_bus(ptr
);
558 BUG_ON(dir
== DMA_NONE
);
560 * If the pointer passed in happens to be in the device's DMA window,
561 * we can safely return the device addr and not worry about bounce
564 if (!address_needs_mapping(hwdev
, dev_addr
, size
) && !swiotlb_force
)
568 * Oh well, have to allocate and map a bounce buffer.
570 map
= map_single(hwdev
, ptr
, size
, dir
);
572 swiotlb_full(hwdev
, size
, dir
, 1);
573 map
= io_tlb_overflow_buffer
;
576 dev_addr
= virt_to_bus(map
);
579 * Ensure that the address returned is DMA'ble
581 if (address_needs_mapping(hwdev
, dev_addr
, size
))
582 panic("map_single: bounce buffer is not DMA'ble");
586 EXPORT_SYMBOL(swiotlb_map_single_attrs
);
589 swiotlb_map_single(struct device
*hwdev
, void *ptr
, size_t size
, int dir
)
591 return swiotlb_map_single_attrs(hwdev
, ptr
, size
, dir
, NULL
);
595 * Unmap a single streaming mode DMA translation. The dma_addr and size must
596 * match what was provided for in a previous swiotlb_map_single call. All
597 * other usages are undefined.
599 * After this call, reads by the cpu to the buffer are guaranteed to see
600 * whatever the device wrote there.
603 swiotlb_unmap_single_attrs(struct device
*hwdev
, dma_addr_t dev_addr
,
604 size_t size
, int dir
, struct dma_attrs
*attrs
)
606 char *dma_addr
= bus_to_virt(dev_addr
);
608 BUG_ON(dir
== DMA_NONE
);
609 if (is_swiotlb_buffer(dma_addr
))
610 unmap_single(hwdev
, dma_addr
, size
, dir
);
611 else if (dir
== DMA_FROM_DEVICE
)
612 dma_mark_clean(dma_addr
, size
);
614 EXPORT_SYMBOL(swiotlb_unmap_single_attrs
);
617 swiotlb_unmap_single(struct device
*hwdev
, dma_addr_t dev_addr
, size_t size
,
620 return swiotlb_unmap_single_attrs(hwdev
, dev_addr
, size
, dir
, NULL
);
623 * Make physical memory consistent for a single streaming mode DMA translation
626 * If you perform a swiotlb_map_single() but wish to interrogate the buffer
627 * using the cpu, yet do not wish to teardown the dma mapping, you must
628 * call this function before doing so. At the next point you give the dma
629 * address back to the card, you must first perform a
630 * swiotlb_dma_sync_for_device, and then the device again owns the buffer
633 swiotlb_sync_single(struct device
*hwdev
, dma_addr_t dev_addr
,
634 size_t size
, int dir
, int target
)
636 char *dma_addr
= bus_to_virt(dev_addr
);
638 BUG_ON(dir
== DMA_NONE
);
639 if (is_swiotlb_buffer(dma_addr
))
640 sync_single(hwdev
, dma_addr
, size
, dir
, target
);
641 else if (dir
== DMA_FROM_DEVICE
)
642 dma_mark_clean(dma_addr
, size
);
646 swiotlb_sync_single_for_cpu(struct device
*hwdev
, dma_addr_t dev_addr
,
647 size_t size
, int dir
)
649 swiotlb_sync_single(hwdev
, dev_addr
, size
, dir
, SYNC_FOR_CPU
);
653 swiotlb_sync_single_for_device(struct device
*hwdev
, dma_addr_t dev_addr
,
654 size_t size
, int dir
)
656 swiotlb_sync_single(hwdev
, dev_addr
, size
, dir
, SYNC_FOR_DEVICE
);
660 * Same as above, but for a sub-range of the mapping.
663 swiotlb_sync_single_range(struct device
*hwdev
, dma_addr_t dev_addr
,
664 unsigned long offset
, size_t size
,
667 char *dma_addr
= bus_to_virt(dev_addr
) + offset
;
669 BUG_ON(dir
== DMA_NONE
);
670 if (is_swiotlb_buffer(dma_addr
))
671 sync_single(hwdev
, dma_addr
, size
, dir
, target
);
672 else if (dir
== DMA_FROM_DEVICE
)
673 dma_mark_clean(dma_addr
, size
);
677 swiotlb_sync_single_range_for_cpu(struct device
*hwdev
, dma_addr_t dev_addr
,
678 unsigned long offset
, size_t size
, int dir
)
680 swiotlb_sync_single_range(hwdev
, dev_addr
, offset
, size
, dir
,
685 swiotlb_sync_single_range_for_device(struct device
*hwdev
, dma_addr_t dev_addr
,
686 unsigned long offset
, size_t size
, int dir
)
688 swiotlb_sync_single_range(hwdev
, dev_addr
, offset
, size
, dir
,
692 void swiotlb_unmap_sg_attrs(struct device
*, struct scatterlist
*, int, int,
695 * Map a set of buffers described by scatterlist in streaming mode for DMA.
696 * This is the scatter-gather version of the above swiotlb_map_single
697 * interface. Here the scatter gather list elements are each tagged with the
698 * appropriate dma address and length. They are obtained via
699 * sg_dma_{address,length}(SG).
701 * NOTE: An implementation may be able to use a smaller number of
702 * DMA address/length pairs than there are SG table elements.
703 * (for example via virtual mapping capabilities)
704 * The routine returns the number of addr/length pairs actually
705 * used, at most nents.
707 * Device ownership issues as mentioned above for swiotlb_map_single are the
711 swiotlb_map_sg_attrs(struct device
*hwdev
, struct scatterlist
*sgl
, int nelems
,
712 int dir
, struct dma_attrs
*attrs
)
714 struct scatterlist
*sg
;
719 BUG_ON(dir
== DMA_NONE
);
721 for_each_sg(sgl
, sg
, nelems
, i
) {
722 addr
= SG_ENT_VIRT_ADDRESS(sg
);
723 dev_addr
= virt_to_bus(addr
);
725 address_needs_mapping(hwdev
, dev_addr
, sg
->length
)) {
726 void *map
= map_single(hwdev
, addr
, sg
->length
, dir
);
728 /* Don't panic here, we expect map_sg users
729 to do proper error handling. */
730 swiotlb_full(hwdev
, sg
->length
, dir
, 0);
731 swiotlb_unmap_sg_attrs(hwdev
, sgl
, i
, dir
,
733 sgl
[0].dma_length
= 0;
736 sg
->dma_address
= virt_to_bus(map
);
738 sg
->dma_address
= dev_addr
;
739 sg
->dma_length
= sg
->length
;
743 EXPORT_SYMBOL(swiotlb_map_sg_attrs
);
746 swiotlb_map_sg(struct device
*hwdev
, struct scatterlist
*sgl
, int nelems
,
749 return swiotlb_map_sg_attrs(hwdev
, sgl
, nelems
, dir
, NULL
);
753 * Unmap a set of streaming mode DMA translations. Again, cpu read rules
754 * concerning calls here are the same as for swiotlb_unmap_single() above.
757 swiotlb_unmap_sg_attrs(struct device
*hwdev
, struct scatterlist
*sgl
,
758 int nelems
, int dir
, struct dma_attrs
*attrs
)
760 struct scatterlist
*sg
;
763 BUG_ON(dir
== DMA_NONE
);
765 for_each_sg(sgl
, sg
, nelems
, i
) {
766 if (sg
->dma_address
!= SG_ENT_PHYS_ADDRESS(sg
))
767 unmap_single(hwdev
, bus_to_virt(sg
->dma_address
),
768 sg
->dma_length
, dir
);
769 else if (dir
== DMA_FROM_DEVICE
)
770 dma_mark_clean(SG_ENT_VIRT_ADDRESS(sg
), sg
->dma_length
);
773 EXPORT_SYMBOL(swiotlb_unmap_sg_attrs
);
776 swiotlb_unmap_sg(struct device
*hwdev
, struct scatterlist
*sgl
, int nelems
,
779 return swiotlb_unmap_sg_attrs(hwdev
, sgl
, nelems
, dir
, NULL
);
783 * Make physical memory consistent for a set of streaming mode DMA translations
786 * The same as swiotlb_sync_single_* but for a scatter-gather list, same rules
790 swiotlb_sync_sg(struct device
*hwdev
, struct scatterlist
*sgl
,
791 int nelems
, int dir
, int target
)
793 struct scatterlist
*sg
;
796 BUG_ON(dir
== DMA_NONE
);
798 for_each_sg(sgl
, sg
, nelems
, i
) {
799 if (sg
->dma_address
!= SG_ENT_PHYS_ADDRESS(sg
))
800 sync_single(hwdev
, bus_to_virt(sg
->dma_address
),
801 sg
->dma_length
, dir
, target
);
802 else if (dir
== DMA_FROM_DEVICE
)
803 dma_mark_clean(SG_ENT_VIRT_ADDRESS(sg
), sg
->dma_length
);
808 swiotlb_sync_sg_for_cpu(struct device
*hwdev
, struct scatterlist
*sg
,
811 swiotlb_sync_sg(hwdev
, sg
, nelems
, dir
, SYNC_FOR_CPU
);
815 swiotlb_sync_sg_for_device(struct device
*hwdev
, struct scatterlist
*sg
,
818 swiotlb_sync_sg(hwdev
, sg
, nelems
, dir
, SYNC_FOR_DEVICE
);
822 swiotlb_dma_mapping_error(struct device
*hwdev
, dma_addr_t dma_addr
)
824 return (dma_addr
== virt_to_bus(io_tlb_overflow_buffer
));
828 * Return whether the given device DMA address mask can be supported
829 * properly. For example, if your device can only drive the low 24-bits
830 * during bus mastering, then you would pass 0x00ffffff as the mask to
834 swiotlb_dma_supported(struct device
*hwdev
, u64 mask
)
836 return virt_to_bus(io_tlb_end
- 1) <= mask
;
839 EXPORT_SYMBOL(swiotlb_map_single
);
840 EXPORT_SYMBOL(swiotlb_unmap_single
);
841 EXPORT_SYMBOL(swiotlb_map_sg
);
842 EXPORT_SYMBOL(swiotlb_unmap_sg
);
843 EXPORT_SYMBOL(swiotlb_sync_single_for_cpu
);
844 EXPORT_SYMBOL(swiotlb_sync_single_for_device
);
845 EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu
);
846 EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device
);
847 EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu
);
848 EXPORT_SYMBOL(swiotlb_sync_sg_for_device
);
849 EXPORT_SYMBOL(swiotlb_dma_mapping_error
);
850 EXPORT_SYMBOL(swiotlb_alloc_coherent
);
851 EXPORT_SYMBOL(swiotlb_free_coherent
);
852 EXPORT_SYMBOL(swiotlb_dma_supported
);