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-rw-r--r--lib/swiotlb.c184
1 files changed, 35 insertions, 149 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 623a68af8b18..9970e55c90bd 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -28,7 +28,6 @@
28#include <asm/io.h> 28#include <asm/io.h>
29#include <asm/dma.h> 29#include <asm/dma.h>
30#include <asm/scatterlist.h> 30#include <asm/scatterlist.h>
31#include <asm/swiotlb.h>
32 31
33#include <linux/init.h> 32#include <linux/init.h>
34#include <linux/bootmem.h> 33#include <linux/bootmem.h>
@@ -36,10 +35,8 @@
36#define OFFSET(val,align) ((unsigned long) \ 35#define OFFSET(val,align) ((unsigned long) \
37 ( (val) & ( (align) - 1))) 36 ( (val) & ( (align) - 1)))
38 37
39#ifndef SG_ENT_VIRT_ADDRESS
40#define SG_ENT_VIRT_ADDRESS(sg) (page_address((sg)->page) + (sg)->offset) 38#define SG_ENT_VIRT_ADDRESS(sg) (page_address((sg)->page) + (sg)->offset)
41#define SG_ENT_PHYS_ADDRESS(sg) virt_to_bus(SG_ENT_VIRT_ADDRESS(sg)) 39#define SG_ENT_PHYS_ADDRESS(sg) virt_to_bus(SG_ENT_VIRT_ADDRESS(sg))
42#endif
43 40
44/* 41/*
45 * Maximum allowable number of contiguous slabs to map, 42 * Maximum allowable number of contiguous slabs to map,
@@ -104,25 +101,13 @@ static unsigned int io_tlb_index;
104 * We need to save away the original address corresponding to a mapped entry 101 * We need to save away the original address corresponding to a mapped entry
105 * for the sync operations. 102 * for the sync operations.
106 */ 103 */
107#ifndef SWIOTLB_ARCH_HAS_IO_TLB_ADDR_T 104static unsigned char **io_tlb_orig_addr;
108typedef char *io_tlb_addr_t;
109#define swiotlb_orig_addr_null(buffer) (!(buffer))
110#define ptr_to_io_tlb_addr(ptr) (ptr)
111#define page_to_io_tlb_addr(pg, off) (page_address(pg) + (off))
112#define sg_to_io_tlb_addr(sg) SG_ENT_VIRT_ADDRESS(sg)
113#endif
114static io_tlb_addr_t *io_tlb_orig_addr;
115 105
116/* 106/*
117 * Protect the above data structures in the map and unmap calls 107 * Protect the above data structures in the map and unmap calls
118 */ 108 */
119static DEFINE_SPINLOCK(io_tlb_lock); 109static DEFINE_SPINLOCK(io_tlb_lock);
120 110
121#ifdef SWIOTLB_EXTRA_VARIABLES
122SWIOTLB_EXTRA_VARIABLES;
123#endif
124
125#ifndef SWIOTLB_ARCH_HAS_SETUP_IO_TLB_NPAGES
126static int __init 111static int __init
127setup_io_tlb_npages(char *str) 112setup_io_tlb_npages(char *str)
128{ 113{
@@ -137,25 +122,9 @@ setup_io_tlb_npages(char *str)
137 swiotlb_force = 1; 122 swiotlb_force = 1;
138 return 1; 123 return 1;
139} 124}
140#endif
141__setup("swiotlb=", setup_io_tlb_npages); 125__setup("swiotlb=", setup_io_tlb_npages);
142/* make io_tlb_overflow tunable too? */ 126/* make io_tlb_overflow tunable too? */
143 127
144#ifndef swiotlb_adjust_size
145#define swiotlb_adjust_size(size) ((void)0)
146#endif
147
148#ifndef swiotlb_adjust_seg
149#define swiotlb_adjust_seg(start, size) ((void)0)
150#endif
151
152#ifndef swiotlb_print_info
153#define swiotlb_print_info(bytes) \
154 printk(KERN_INFO "Placing %luMB software IO TLB between 0x%lx - " \
155 "0x%lx\n", bytes >> 20, \
156 virt_to_bus(io_tlb_start), virt_to_bus(io_tlb_end))
157#endif
158
159/* 128/*
160 * Statically reserve bounce buffer space and initialize bounce buffer data 129 * Statically reserve bounce buffer space and initialize bounce buffer data
161 * structures for the software IO TLB used to implement the DMA API. 130 * structures for the software IO TLB used to implement the DMA API.
@@ -169,8 +138,6 @@ swiotlb_init_with_default_size(size_t default_size)
169 io_tlb_nslabs = (default_size >> IO_TLB_SHIFT); 138 io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
170 io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); 139 io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
171 } 140 }
172 swiotlb_adjust_size(io_tlb_nslabs);
173 swiotlb_adjust_size(io_tlb_overflow);
174 141
175 bytes = io_tlb_nslabs << IO_TLB_SHIFT; 142 bytes = io_tlb_nslabs << IO_TLB_SHIFT;
176 143
@@ -188,14 +155,10 @@ swiotlb_init_with_default_size(size_t default_size)
188 * between io_tlb_start and io_tlb_end. 155 * between io_tlb_start and io_tlb_end.
189 */ 156 */
190 io_tlb_list = alloc_bootmem(io_tlb_nslabs * sizeof(int)); 157 io_tlb_list = alloc_bootmem(io_tlb_nslabs * sizeof(int));
191 for (i = 0; i < io_tlb_nslabs; i++) { 158 for (i = 0; i < io_tlb_nslabs; i++)
192 if ( !(i % IO_TLB_SEGSIZE) )
193 swiotlb_adjust_seg(io_tlb_start + (i << IO_TLB_SHIFT),
194 IO_TLB_SEGSIZE << IO_TLB_SHIFT);
195 io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE); 159 io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
196 }
197 io_tlb_index = 0; 160 io_tlb_index = 0;
198 io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(io_tlb_addr_t)); 161 io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(char *));
199 162
200 /* 163 /*
201 * Get the overflow emergency buffer 164 * Get the overflow emergency buffer
@@ -203,21 +166,17 @@ swiotlb_init_with_default_size(size_t default_size)
203 io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow); 166 io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
204 if (!io_tlb_overflow_buffer) 167 if (!io_tlb_overflow_buffer)
205 panic("Cannot allocate SWIOTLB overflow buffer!\n"); 168 panic("Cannot allocate SWIOTLB overflow buffer!\n");
206 swiotlb_adjust_seg(io_tlb_overflow_buffer, io_tlb_overflow);
207 169
208 swiotlb_print_info(bytes); 170 printk(KERN_INFO "Placing software IO TLB between 0x%lx - 0x%lx\n",
171 virt_to_bus(io_tlb_start), virt_to_bus(io_tlb_end));
209} 172}
210#ifndef __swiotlb_init_with_default_size
211#define __swiotlb_init_with_default_size swiotlb_init_with_default_size
212#endif
213 173
214void __init 174void __init
215swiotlb_init(void) 175swiotlb_init(void)
216{ 176{
217 __swiotlb_init_with_default_size(64 * (1<<20)); /* default to 64MB */ 177 swiotlb_init_with_default_size(64 * (1<<20)); /* default to 64MB */
218} 178}
219 179
220#ifdef SWIOTLB_ARCH_NEED_LATE_INIT
221/* 180/*
222 * Systems with larger DMA zones (those that don't support ISA) can 181 * Systems with larger DMA zones (those that don't support ISA) can
223 * initialize the swiotlb later using the slab allocator if needed. 182 * initialize the swiotlb later using the slab allocator if needed.
@@ -275,12 +234,12 @@ swiotlb_late_init_with_default_size(size_t default_size)
275 io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE); 234 io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
276 io_tlb_index = 0; 235 io_tlb_index = 0;
277 236
278 io_tlb_orig_addr = (io_tlb_addr_t *)__get_free_pages(GFP_KERNEL, 237 io_tlb_orig_addr = (unsigned char **)__get_free_pages(GFP_KERNEL,
279 get_order(io_tlb_nslabs * sizeof(io_tlb_addr_t))); 238 get_order(io_tlb_nslabs * sizeof(char *)));
280 if (!io_tlb_orig_addr) 239 if (!io_tlb_orig_addr)
281 goto cleanup3; 240 goto cleanup3;
282 241
283 memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(io_tlb_addr_t)); 242 memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(char *));
284 243
285 /* 244 /*
286 * Get the overflow emergency buffer 245 * Get the overflow emergency buffer
@@ -290,17 +249,19 @@ swiotlb_late_init_with_default_size(size_t default_size)
290 if (!io_tlb_overflow_buffer) 249 if (!io_tlb_overflow_buffer)
291 goto cleanup4; 250 goto cleanup4;
292 251
293 swiotlb_print_info(bytes); 252 printk(KERN_INFO "Placing %luMB software IO TLB between 0x%lx - "
253 "0x%lx\n", bytes >> 20,
254 virt_to_bus(io_tlb_start), virt_to_bus(io_tlb_end));
294 255
295 return 0; 256 return 0;
296 257
297cleanup4: 258cleanup4:
298 free_pages((unsigned long)io_tlb_orig_addr, 259 free_pages((unsigned long)io_tlb_orig_addr, get_order(io_tlb_nslabs *
299 get_order(io_tlb_nslabs * sizeof(io_tlb_addr_t))); 260 sizeof(char *)));
300 io_tlb_orig_addr = NULL; 261 io_tlb_orig_addr = NULL;
301cleanup3: 262cleanup3:
302 free_pages((unsigned long)io_tlb_list, 263 free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
303 get_order(io_tlb_nslabs * sizeof(int))); 264 sizeof(int)));
304 io_tlb_list = NULL; 265 io_tlb_list = NULL;
305cleanup2: 266cleanup2:
306 io_tlb_end = NULL; 267 io_tlb_end = NULL;
@@ -310,9 +271,7 @@ cleanup1:
310 io_tlb_nslabs = req_nslabs; 271 io_tlb_nslabs = req_nslabs;
311 return -ENOMEM; 272 return -ENOMEM;
312} 273}
313#endif
314 274
315#ifndef SWIOTLB_ARCH_HAS_NEEDS_MAPPING
316static int 275static int
317address_needs_mapping(struct device *hwdev, dma_addr_t addr) 276address_needs_mapping(struct device *hwdev, dma_addr_t addr)
318{ 277{
@@ -323,35 +282,11 @@ address_needs_mapping(struct device *hwdev, dma_addr_t addr)
323 return (addr & ~mask) != 0; 282 return (addr & ~mask) != 0;
324} 283}
325 284
326static inline int range_needs_mapping(const void *ptr, size_t size)
327{
328 return swiotlb_force;
329}
330
331static inline int order_needs_mapping(unsigned int order)
332{
333 return 0;
334}
335#endif
336
337static void
338__sync_single(io_tlb_addr_t buffer, char *dma_addr, size_t size, int dir)
339{
340#ifndef SWIOTLB_ARCH_HAS_SYNC_SINGLE
341 if (dir == DMA_TO_DEVICE)
342 memcpy(dma_addr, buffer, size);
343 else
344 memcpy(buffer, dma_addr, size);
345#else
346 __swiotlb_arch_sync_single(buffer, dma_addr, size, dir);
347#endif
348}
349
350/* 285/*
351 * Allocates bounce buffer and returns its kernel virtual address. 286 * Allocates bounce buffer and returns its kernel virtual address.
352 */ 287 */
353static void * 288static void *
354map_single(struct device *hwdev, io_tlb_addr_t buffer, size_t size, int dir) 289map_single(struct device *hwdev, char *buffer, size_t size, int dir)
355{ 290{
356 unsigned long flags; 291 unsigned long flags;
357 char *dma_addr; 292 char *dma_addr;
@@ -424,7 +359,7 @@ map_single(struct device *hwdev, io_tlb_addr_t buffer, size_t size, int dir)
424 */ 359 */
425 io_tlb_orig_addr[index] = buffer; 360 io_tlb_orig_addr[index] = buffer;
426 if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) 361 if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
427 __sync_single(buffer, dma_addr, size, DMA_TO_DEVICE); 362 memcpy(dma_addr, buffer, size);
428 363
429 return dma_addr; 364 return dma_addr;
430} 365}
@@ -438,18 +373,17 @@ unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir)
438 unsigned long flags; 373 unsigned long flags;
439 int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; 374 int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
440 int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT; 375 int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
441 io_tlb_addr_t buffer = io_tlb_orig_addr[index]; 376 char *buffer = io_tlb_orig_addr[index];
442 377
443 /* 378 /*
444 * First, sync the memory before unmapping the entry 379 * First, sync the memory before unmapping the entry
445 */ 380 */
446 if (!swiotlb_orig_addr_null(buffer) 381 if (buffer && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
447 && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
448 /* 382 /*
449 * bounce... copy the data back into the original buffer * and 383 * bounce... copy the data back into the original buffer * and
450 * delete the bounce buffer. 384 * delete the bounce buffer.
451 */ 385 */
452 __sync_single(buffer, dma_addr, size, DMA_FROM_DEVICE); 386 memcpy(buffer, dma_addr, size);
453 387
454 /* 388 /*
455 * Return the buffer to the free list by setting the corresponding 389 * Return the buffer to the free list by setting the corresponding
@@ -482,18 +416,18 @@ sync_single(struct device *hwdev, char *dma_addr, size_t size,
482 int dir, int target) 416 int dir, int target)
483{ 417{
484 int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT; 418 int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
485 io_tlb_addr_t buffer = io_tlb_orig_addr[index]; 419 char *buffer = io_tlb_orig_addr[index];
486 420
487 switch (target) { 421 switch (target) {
488 case SYNC_FOR_CPU: 422 case SYNC_FOR_CPU:
489 if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)) 423 if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
490 __sync_single(buffer, dma_addr, size, DMA_FROM_DEVICE); 424 memcpy(buffer, dma_addr, size);
491 else 425 else
492 BUG_ON(dir != DMA_TO_DEVICE); 426 BUG_ON(dir != DMA_TO_DEVICE);
493 break; 427 break;
494 case SYNC_FOR_DEVICE: 428 case SYNC_FOR_DEVICE:
495 if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)) 429 if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
496 __sync_single(buffer, dma_addr, size, DMA_TO_DEVICE); 430 memcpy(dma_addr, buffer, size);
497 else 431 else
498 BUG_ON(dir != DMA_FROM_DEVICE); 432 BUG_ON(dir != DMA_FROM_DEVICE);
499 break; 433 break;
@@ -502,8 +436,6 @@ sync_single(struct device *hwdev, char *dma_addr, size_t size,
502 } 436 }
503} 437}
504 438
505#ifdef SWIOTLB_ARCH_NEED_ALLOC
506
507void * 439void *
508swiotlb_alloc_coherent(struct device *hwdev, size_t size, 440swiotlb_alloc_coherent(struct device *hwdev, size_t size,
509 dma_addr_t *dma_handle, gfp_t flags) 441 dma_addr_t *dma_handle, gfp_t flags)
@@ -519,10 +451,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
519 */ 451 */
520 flags |= GFP_DMA; 452 flags |= GFP_DMA;
521 453
522 if (!order_needs_mapping(order)) 454 ret = (void *)__get_free_pages(flags, order);
523 ret = (void *)__get_free_pages(flags, order);
524 else
525 ret = NULL;
526 if (ret && address_needs_mapping(hwdev, virt_to_bus(ret))) { 455 if (ret && address_needs_mapping(hwdev, virt_to_bus(ret))) {
527 /* 456 /*
528 * The allocated memory isn't reachable by the device. 457 * The allocated memory isn't reachable by the device.
@@ -560,7 +489,6 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
560 *dma_handle = dev_addr; 489 *dma_handle = dev_addr;
561 return ret; 490 return ret;
562} 491}
563EXPORT_SYMBOL(swiotlb_alloc_coherent);
564 492
565void 493void
566swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, 494swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
@@ -573,9 +501,6 @@ swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
573 /* DMA_TO_DEVICE to avoid memcpy in unmap_single */ 501 /* DMA_TO_DEVICE to avoid memcpy in unmap_single */
574 swiotlb_unmap_single (hwdev, dma_handle, size, DMA_TO_DEVICE); 502 swiotlb_unmap_single (hwdev, dma_handle, size, DMA_TO_DEVICE);
575} 503}
576EXPORT_SYMBOL(swiotlb_free_coherent);
577
578#endif
579 504
580static void 505static void
581swiotlb_full(struct device *dev, size_t size, int dir, int do_panic) 506swiotlb_full(struct device *dev, size_t size, int dir, int do_panic)
@@ -617,14 +542,13 @@ swiotlb_map_single(struct device *hwdev, void *ptr, size_t size, int dir)
617 * we can safely return the device addr and not worry about bounce 542 * we can safely return the device addr and not worry about bounce
618 * buffering it. 543 * buffering it.
619 */ 544 */
620 if (!range_needs_mapping(ptr, size) 545 if (!address_needs_mapping(hwdev, dev_addr) && !swiotlb_force)
621 && !address_needs_mapping(hwdev, dev_addr))
622 return dev_addr; 546 return dev_addr;
623 547
624 /* 548 /*
625 * Oh well, have to allocate and map a bounce buffer. 549 * Oh well, have to allocate and map a bounce buffer.
626 */ 550 */
627 map = map_single(hwdev, ptr_to_io_tlb_addr(ptr), size, dir); 551 map = map_single(hwdev, ptr, size, dir);
628 if (!map) { 552 if (!map) {
629 swiotlb_full(hwdev, size, dir, 1); 553 swiotlb_full(hwdev, size, dir, 1);
630 map = io_tlb_overflow_buffer; 554 map = io_tlb_overflow_buffer;
@@ -752,16 +676,17 @@ int
752swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nelems, 676swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nelems,
753 int dir) 677 int dir)
754{ 678{
679 void *addr;
755 dma_addr_t dev_addr; 680 dma_addr_t dev_addr;
756 int i; 681 int i;
757 682
758 BUG_ON(dir == DMA_NONE); 683 BUG_ON(dir == DMA_NONE);
759 684
760 for (i = 0; i < nelems; i++, sg++) { 685 for (i = 0; i < nelems; i++, sg++) {
761 dev_addr = SG_ENT_PHYS_ADDRESS(sg); 686 addr = SG_ENT_VIRT_ADDRESS(sg);
762 if (range_needs_mapping(SG_ENT_VIRT_ADDRESS(sg), sg->length) 687 dev_addr = virt_to_bus(addr);
763 || address_needs_mapping(hwdev, dev_addr)) { 688 if (swiotlb_force || address_needs_mapping(hwdev, dev_addr)) {
764 void *map = map_single(hwdev, sg_to_io_tlb_addr(sg), sg->length, dir); 689 void *map = map_single(hwdev, addr, sg->length, dir);
765 if (!map) { 690 if (!map) {
766 /* Don't panic here, we expect map_sg users 691 /* Don't panic here, we expect map_sg users
767 to do proper error handling. */ 692 to do proper error handling. */
@@ -835,44 +760,6 @@ swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
835 swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE); 760 swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
836} 761}
837 762
838#ifdef SWIOTLB_ARCH_NEED_MAP_PAGE
839
840dma_addr_t
841swiotlb_map_page(struct device *hwdev, struct page *page,
842 unsigned long offset, size_t size,
843 enum dma_data_direction direction)
844{
845 dma_addr_t dev_addr;
846 char *map;
847
848 dev_addr = page_to_bus(page) + offset;
849 if (address_needs_mapping(hwdev, dev_addr)) {
850 map = map_single(hwdev, page_to_io_tlb_addr(page, offset), size, direction);
851 if (!map) {
852 swiotlb_full(hwdev, size, direction, 1);
853 map = io_tlb_overflow_buffer;
854 }
855 dev_addr = virt_to_bus(map);
856 }
857
858 return dev_addr;
859}
860
861void
862swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
863 size_t size, enum dma_data_direction direction)
864{
865 char *dma_addr = bus_to_virt(dev_addr);
866
867 BUG_ON(direction == DMA_NONE);
868 if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end)
869 unmap_single(hwdev, dma_addr, size, direction);
870 else if (direction == DMA_FROM_DEVICE)
871 dma_mark_clean(dma_addr, size);
872}
873
874#endif
875
876int 763int
877swiotlb_dma_mapping_error(dma_addr_t dma_addr) 764swiotlb_dma_mapping_error(dma_addr_t dma_addr)
878{ 765{
@@ -885,13 +772,10 @@ swiotlb_dma_mapping_error(dma_addr_t dma_addr)
885 * during bus mastering, then you would pass 0x00ffffff as the mask to 772 * during bus mastering, then you would pass 0x00ffffff as the mask to
886 * this function. 773 * this function.
887 */ 774 */
888#ifndef __swiotlb_dma_supported
889#define __swiotlb_dma_supported(hwdev, mask) (virt_to_bus(io_tlb_end - 1) <= (mask))
890#endif
891int 775int
892swiotlb_dma_supported(struct device *hwdev, u64 mask) 776swiotlb_dma_supported(struct device *hwdev, u64 mask)
893{ 777{
894 return __swiotlb_dma_supported(hwdev, mask); 778 return virt_to_bus(io_tlb_end - 1) <= mask;
895} 779}
896 780
897EXPORT_SYMBOL(swiotlb_init); 781EXPORT_SYMBOL(swiotlb_init);
@@ -906,4 +790,6 @@ EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device);
906EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu); 790EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu);
907EXPORT_SYMBOL(swiotlb_sync_sg_for_device); 791EXPORT_SYMBOL(swiotlb_sync_sg_for_device);
908EXPORT_SYMBOL(swiotlb_dma_mapping_error); 792EXPORT_SYMBOL(swiotlb_dma_mapping_error);
793EXPORT_SYMBOL(swiotlb_alloc_coherent);
794EXPORT_SYMBOL(swiotlb_free_coherent);
909EXPORT_SYMBOL(swiotlb_dma_supported); 795EXPORT_SYMBOL(swiotlb_dma_supported);