blob: 437eedb5a53ba1feae04f98b5def86798462f920 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Dynamic DMA mapping support.
3 *
Jan Beulich563aaf02007-02-05 18:51:25 -08004 * This implementation is a fallback for platforms that do not support
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * 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>
10 *
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.
John W. Linville569c8bf2005-09-29 14:45:24 -070014 * 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.
Becky Brucefb05a372008-12-22 10:26:09 -080017 * 08/12/11 beckyb Add highmem support
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 */
19
20#include <linux/cache.h>
Tony Luck17e5ad62005-09-29 15:52:13 -070021#include <linux/dma-mapping.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/mm.h>
23#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/spinlock.h>
25#include <linux/string.h>
Ian Campbell0016fde2008-12-16 12:17:27 -080026#include <linux/swiotlb.h>
Becky Brucefb05a372008-12-22 10:26:09 -080027#include <linux/pfn.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/types.h>
29#include <linux/ctype.h>
Jeremy Fitzhardingeef9b1892008-12-16 12:17:33 -080030#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <asm/dma.h>
Tony Luck17e5ad62005-09-29 15:52:13 -070034#include <asm/scatterlist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#include <linux/init.h>
37#include <linux/bootmem.h>
FUJITA Tomonoria8522502008-04-29 00:59:36 -070038#include <linux/iommu-helper.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40#define OFFSET(val,align) ((unsigned long) \
41 ( (val) & ( (align) - 1)))
42
Alex Williamson0b9afed2005-09-06 11:20:49 -060043#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
44
45/*
46 * Minimum IO TLB size to bother booting with. Systems with mainly
47 * 64bit capable cards will only lightly use the swiotlb. If we can't
48 * allocate a contiguous 1MB, we're probably in trouble anyway.
49 */
50#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
51
John W. Linvillede69e0f2005-09-29 14:44:57 -070052/*
53 * Enumeration for sync targets
54 */
55enum dma_sync_target {
56 SYNC_FOR_CPU = 0,
57 SYNC_FOR_DEVICE = 1,
58};
59
Linus Torvalds1da177e2005-04-16 15:20:36 -070060int swiotlb_force;
61
62/*
Becky Bruceceb5ac32009-04-08 09:09:15 -050063 * Used to do a quick range check in unmap_single and
64 * sync_single_*, to see if the memory was in fact allocated by this
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 * API.
66 */
67static char *io_tlb_start, *io_tlb_end;
68
69/*
70 * The number of IO TLB blocks (in groups of 64) betweeen io_tlb_start and
71 * io_tlb_end. This is command line adjustable via setup_io_tlb_npages.
72 */
73static unsigned long io_tlb_nslabs;
74
75/*
76 * When the IOMMU overflows we return a fallback buffer. This sets the size.
77 */
78static unsigned long io_tlb_overflow = 32*1024;
79
80void *io_tlb_overflow_buffer;
81
82/*
83 * This is a free list describing the number of free entries available from
84 * each index
85 */
86static unsigned int *io_tlb_list;
87static unsigned int io_tlb_index;
88
89/*
90 * We need to save away the original address corresponding to a mapped entry
91 * for the sync operations.
92 */
Becky Brucebc40ac62008-12-22 10:26:08 -080093static phys_addr_t *io_tlb_orig_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
95/*
96 * Protect the above data structures in the map and unmap calls
97 */
98static DEFINE_SPINLOCK(io_tlb_lock);
99
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900100static int late_alloc;
101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102static int __init
103setup_io_tlb_npages(char *str)
104{
105 if (isdigit(*str)) {
Alex Williamsone8579e72005-08-04 13:06:00 -0700106 io_tlb_nslabs = simple_strtoul(str, &str, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 /* avoid tail segment of size < IO_TLB_SEGSIZE */
108 io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
109 }
110 if (*str == ',')
111 ++str;
FUJITA Tomonorib18485e2009-11-12 00:03:28 +0900112 if (!strcmp(str, "force"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 swiotlb_force = 1;
FUJITA Tomonorib18485e2009-11-12 00:03:28 +0900114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 return 1;
116}
117__setup("swiotlb=", setup_io_tlb_npages);
118/* make io_tlb_overflow tunable too? */
119
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900120/* Note that this doesn't work with highmem page */
Jeremy Fitzhardinge70a7d3c2008-12-22 10:26:05 -0800121static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
122 volatile void *address)
Ian Campbelle08e1f72008-12-16 12:17:30 -0800123{
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900124 return phys_to_dma(hwdev, virt_to_phys(address));
Ian Campbelle08e1f72008-12-16 12:17:30 -0800125}
126
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900127void swiotlb_print_info(void)
Ian Campbell2e5b2b82008-12-16 12:17:34 -0800128{
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900129 unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;
Ian Campbell2e5b2b82008-12-16 12:17:34 -0800130 phys_addr_t pstart, pend;
Ian Campbell2e5b2b82008-12-16 12:17:34 -0800131
132 pstart = virt_to_phys(io_tlb_start);
133 pend = virt_to_phys(io_tlb_end);
134
Ian Campbell2e5b2b82008-12-16 12:17:34 -0800135 printk(KERN_INFO "Placing %luMB software IO TLB between %p - %p\n",
136 bytes >> 20, io_tlb_start, io_tlb_end);
Jeremy Fitzhardinge70a7d3c2008-12-22 10:26:05 -0800137 printk(KERN_INFO "software IO TLB at phys %#llx - %#llx\n",
138 (unsigned long long)pstart,
139 (unsigned long long)pend);
Ian Campbell2e5b2b82008-12-16 12:17:34 -0800140}
141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142/*
143 * Statically reserve bounce buffer space and initialize bounce buffer data
Tony Luck17e5ad62005-09-29 15:52:13 -0700144 * structures for the software IO TLB used to implement the DMA API.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 */
Jan Beulich563aaf02007-02-05 18:51:25 -0800146void __init
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900147swiotlb_init_with_default_size(size_t default_size, int verbose)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
Jan Beulich563aaf02007-02-05 18:51:25 -0800149 unsigned long i, bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151 if (!io_tlb_nslabs) {
Alex Williamsone8579e72005-08-04 13:06:00 -0700152 io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
154 }
155
Jan Beulich563aaf02007-02-05 18:51:25 -0800156 bytes = io_tlb_nslabs << IO_TLB_SHIFT;
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 /*
159 * Get IO TLB memory from the low pages
160 */
FUJITA Tomonori38851232009-07-10 10:04:50 +0900161 io_tlb_start = alloc_bootmem_low_pages(bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 if (!io_tlb_start)
163 panic("Cannot allocate SWIOTLB buffer");
Jan Beulich563aaf02007-02-05 18:51:25 -0800164 io_tlb_end = io_tlb_start + bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
166 /*
167 * Allocate and initialize the free list array. This array is used
168 * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
169 * between io_tlb_start and io_tlb_end.
170 */
171 io_tlb_list = alloc_bootmem(io_tlb_nslabs * sizeof(int));
Tony Luck25667d62007-03-06 13:31:45 -0800172 for (i = 0; i < io_tlb_nslabs; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
174 io_tlb_index = 0;
Becky Brucebc40ac62008-12-22 10:26:08 -0800175 io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(phys_addr_t));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
177 /*
178 * Get the overflow emergency buffer
179 */
180 io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
Jan Beulich563aaf02007-02-05 18:51:25 -0800181 if (!io_tlb_overflow_buffer)
182 panic("Cannot allocate SWIOTLB overflow buffer!\n");
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900183 if (verbose)
184 swiotlb_print_info();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185}
186
Jan Beulich563aaf02007-02-05 18:51:25 -0800187void __init
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900188swiotlb_init(int verbose)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189{
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900190 swiotlb_init_with_default_size(64 * (1<<20), verbose); /* default to 64MB */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191}
192
Alex Williamson0b9afed2005-09-06 11:20:49 -0600193/*
194 * Systems with larger DMA zones (those that don't support ISA) can
195 * initialize the swiotlb later using the slab allocator if needed.
196 * This should be just like above, but with some error catching.
197 */
198int
Jan Beulich563aaf02007-02-05 18:51:25 -0800199swiotlb_late_init_with_default_size(size_t default_size)
Alex Williamson0b9afed2005-09-06 11:20:49 -0600200{
Jan Beulich563aaf02007-02-05 18:51:25 -0800201 unsigned long i, bytes, req_nslabs = io_tlb_nslabs;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600202 unsigned int order;
203
204 if (!io_tlb_nslabs) {
205 io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
206 io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
207 }
208
209 /*
210 * Get IO TLB memory from the low pages
211 */
Jan Beulich563aaf02007-02-05 18:51:25 -0800212 order = get_order(io_tlb_nslabs << IO_TLB_SHIFT);
Alex Williamson0b9afed2005-09-06 11:20:49 -0600213 io_tlb_nslabs = SLABS_PER_PAGE << order;
Jan Beulich563aaf02007-02-05 18:51:25 -0800214 bytes = io_tlb_nslabs << IO_TLB_SHIFT;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600215
216 while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
FUJITA Tomonoribb521962009-07-10 10:04:51 +0900217 io_tlb_start = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
218 order);
Alex Williamson0b9afed2005-09-06 11:20:49 -0600219 if (io_tlb_start)
220 break;
221 order--;
222 }
223
224 if (!io_tlb_start)
225 goto cleanup1;
226
Jan Beulich563aaf02007-02-05 18:51:25 -0800227 if (order != get_order(bytes)) {
Alex Williamson0b9afed2005-09-06 11:20:49 -0600228 printk(KERN_WARNING "Warning: only able to allocate %ld MB "
229 "for software IO TLB\n", (PAGE_SIZE << order) >> 20);
230 io_tlb_nslabs = SLABS_PER_PAGE << order;
Jan Beulich563aaf02007-02-05 18:51:25 -0800231 bytes = io_tlb_nslabs << IO_TLB_SHIFT;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600232 }
Jan Beulich563aaf02007-02-05 18:51:25 -0800233 io_tlb_end = io_tlb_start + bytes;
234 memset(io_tlb_start, 0, bytes);
Alex Williamson0b9afed2005-09-06 11:20:49 -0600235
236 /*
237 * Allocate and initialize the free list array. This array is used
238 * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
239 * between io_tlb_start and io_tlb_end.
240 */
241 io_tlb_list = (unsigned int *)__get_free_pages(GFP_KERNEL,
242 get_order(io_tlb_nslabs * sizeof(int)));
243 if (!io_tlb_list)
244 goto cleanup2;
245
246 for (i = 0; i < io_tlb_nslabs; i++)
247 io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
248 io_tlb_index = 0;
249
Becky Brucebc40ac62008-12-22 10:26:08 -0800250 io_tlb_orig_addr = (phys_addr_t *)
251 __get_free_pages(GFP_KERNEL,
252 get_order(io_tlb_nslabs *
253 sizeof(phys_addr_t)));
Alex Williamson0b9afed2005-09-06 11:20:49 -0600254 if (!io_tlb_orig_addr)
255 goto cleanup3;
256
Becky Brucebc40ac62008-12-22 10:26:08 -0800257 memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(phys_addr_t));
Alex Williamson0b9afed2005-09-06 11:20:49 -0600258
259 /*
260 * Get the overflow emergency buffer
261 */
262 io_tlb_overflow_buffer = (void *)__get_free_pages(GFP_DMA,
263 get_order(io_tlb_overflow));
264 if (!io_tlb_overflow_buffer)
265 goto cleanup4;
266
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900267 swiotlb_print_info();
Alex Williamson0b9afed2005-09-06 11:20:49 -0600268
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900269 late_alloc = 1;
270
Alex Williamson0b9afed2005-09-06 11:20:49 -0600271 return 0;
272
273cleanup4:
Becky Brucebc40ac62008-12-22 10:26:08 -0800274 free_pages((unsigned long)io_tlb_orig_addr,
275 get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
Alex Williamson0b9afed2005-09-06 11:20:49 -0600276 io_tlb_orig_addr = NULL;
277cleanup3:
Tony Luck25667d62007-03-06 13:31:45 -0800278 free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
279 sizeof(int)));
Alex Williamson0b9afed2005-09-06 11:20:49 -0600280 io_tlb_list = NULL;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600281cleanup2:
Jan Beulich563aaf02007-02-05 18:51:25 -0800282 io_tlb_end = NULL;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600283 free_pages((unsigned long)io_tlb_start, order);
284 io_tlb_start = NULL;
285cleanup1:
286 io_tlb_nslabs = req_nslabs;
287 return -ENOMEM;
288}
289
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900290void __init swiotlb_free(void)
291{
292 if (!io_tlb_overflow_buffer)
293 return;
294
295 if (late_alloc) {
296 free_pages((unsigned long)io_tlb_overflow_buffer,
297 get_order(io_tlb_overflow));
298 free_pages((unsigned long)io_tlb_orig_addr,
299 get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
300 free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
301 sizeof(int)));
302 free_pages((unsigned long)io_tlb_start,
303 get_order(io_tlb_nslabs << IO_TLB_SHIFT));
304 } else {
305 free_bootmem_late(__pa(io_tlb_overflow_buffer),
306 io_tlb_overflow);
307 free_bootmem_late(__pa(io_tlb_orig_addr),
308 io_tlb_nslabs * sizeof(phys_addr_t));
309 free_bootmem_late(__pa(io_tlb_list),
310 io_tlb_nslabs * sizeof(int));
311 free_bootmem_late(__pa(io_tlb_start),
312 io_tlb_nslabs << IO_TLB_SHIFT);
313 }
314}
315
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900316static int is_swiotlb_buffer(phys_addr_t paddr)
FUJITA Tomonori640aebf2008-09-08 18:53:50 +0900317{
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900318 return paddr >= virt_to_phys(io_tlb_start) &&
319 paddr < virt_to_phys(io_tlb_end);
FUJITA Tomonori640aebf2008-09-08 18:53:50 +0900320}
321
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322/*
Becky Brucefb05a372008-12-22 10:26:09 -0800323 * Bounce: copy the swiotlb buffer back to the original dma location
324 */
325static void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
326 enum dma_data_direction dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327{
Becky Brucefb05a372008-12-22 10:26:09 -0800328 unsigned long pfn = PFN_DOWN(phys);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Becky Brucefb05a372008-12-22 10:26:09 -0800330 if (PageHighMem(pfn_to_page(pfn))) {
331 /* The buffer does not have a mapping. Map it in and copy */
332 unsigned int offset = phys & ~PAGE_MASK;
333 char *buffer;
334 unsigned int sz = 0;
335 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
Becky Brucefb05a372008-12-22 10:26:09 -0800337 while (size) {
Becky Bruce67131ad2009-04-08 09:09:16 -0500338 sz = min_t(size_t, PAGE_SIZE - offset, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Becky Brucefb05a372008-12-22 10:26:09 -0800340 local_irq_save(flags);
341 buffer = kmap_atomic(pfn_to_page(pfn),
342 KM_BOUNCE_READ);
343 if (dir == DMA_TO_DEVICE)
344 memcpy(dma_addr, buffer + offset, sz);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 else
Becky Brucefb05a372008-12-22 10:26:09 -0800346 memcpy(buffer + offset, dma_addr, sz);
347 kunmap_atomic(buffer, KM_BOUNCE_READ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 local_irq_restore(flags);
Becky Brucefb05a372008-12-22 10:26:09 -0800349
350 size -= sz;
351 pfn++;
352 dma_addr += sz;
353 offset = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 }
355 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 if (dir == DMA_TO_DEVICE)
Becky Brucefb05a372008-12-22 10:26:09 -0800357 memcpy(dma_addr, phys_to_virt(phys), size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 else
Becky Brucefb05a372008-12-22 10:26:09 -0800359 memcpy(phys_to_virt(phys), dma_addr, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 }
361}
362
363/*
364 * Allocates bounce buffer and returns its kernel virtual address.
365 */
366static void *
Becky Brucebc40ac62008-12-22 10:26:08 -0800367map_single(struct device *hwdev, phys_addr_t phys, size_t size, int dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368{
369 unsigned long flags;
370 char *dma_addr;
371 unsigned int nslots, stride, index, wrap;
372 int i;
FUJITA Tomonori681cc5c2008-02-04 22:28:16 -0800373 unsigned long start_dma_addr;
374 unsigned long mask;
375 unsigned long offset_slots;
376 unsigned long max_slots;
377
378 mask = dma_get_seg_boundary(hwdev);
Jeremy Fitzhardinge70a7d3c2008-12-22 10:26:05 -0800379 start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start) & mask;
FUJITA Tomonori681cc5c2008-02-04 22:28:16 -0800380
381 offset_slots = ALIGN(start_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
Ian Campbella5ddde42008-12-16 12:17:29 -0800382
383 /*
384 * Carefully handle integer overflow which can occur when mask == ~0UL.
385 */
Jan Beulichb15a3892008-03-13 09:13:30 +0000386 max_slots = mask + 1
387 ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT
388 : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
390 /*
391 * For mappings greater than a page, we limit the stride (and
392 * hence alignment) to a page size.
393 */
394 nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
395 if (size > PAGE_SIZE)
396 stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT));
397 else
398 stride = 1;
399
Eric Sesterhenn34814542006-03-24 18:47:11 +0100400 BUG_ON(!nslots);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
402 /*
403 * Find suitable number of IO TLB entries size that will fit this
404 * request and allocate a buffer from that IO TLB pool.
405 */
406 spin_lock_irqsave(&io_tlb_lock, flags);
Andrew Mortona7133a12008-04-29 00:59:36 -0700407 index = ALIGN(io_tlb_index, stride);
408 if (index >= io_tlb_nslabs)
409 index = 0;
410 wrap = index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
Andrew Mortona7133a12008-04-29 00:59:36 -0700412 do {
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700413 while (iommu_is_span_boundary(index, nslots, offset_slots,
414 max_slots)) {
Jan Beulichb15a3892008-03-13 09:13:30 +0000415 index += stride;
416 if (index >= io_tlb_nslabs)
417 index = 0;
Andrew Mortona7133a12008-04-29 00:59:36 -0700418 if (index == wrap)
419 goto not_found;
420 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
Andrew Mortona7133a12008-04-29 00:59:36 -0700422 /*
423 * If we find a slot that indicates we have 'nslots' number of
424 * contiguous buffers, we allocate the buffers from that slot
425 * and mark the entries as '0' indicating unavailable.
426 */
427 if (io_tlb_list[index] >= nslots) {
428 int count = 0;
429
430 for (i = index; i < (int) (index + nslots); i++)
431 io_tlb_list[i] = 0;
432 for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE - 1) && io_tlb_list[i]; i--)
433 io_tlb_list[i] = ++count;
434 dma_addr = io_tlb_start + (index << IO_TLB_SHIFT);
435
436 /*
437 * Update the indices to avoid searching in the next
438 * round.
439 */
440 io_tlb_index = ((index + nslots) < io_tlb_nslabs
441 ? (index + nslots) : 0);
442
443 goto found;
444 }
445 index += stride;
446 if (index >= io_tlb_nslabs)
447 index = 0;
448 } while (index != wrap);
449
450not_found:
451 spin_unlock_irqrestore(&io_tlb_lock, flags);
452 return NULL;
453found:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 spin_unlock_irqrestore(&io_tlb_lock, flags);
455
456 /*
457 * Save away the mapping from the original address to the DMA address.
458 * This is needed when we sync the memory. Then we sync the buffer if
459 * needed.
460 */
Becky Brucebc40ac62008-12-22 10:26:08 -0800461 for (i = 0; i < nslots; i++)
462 io_tlb_orig_addr[index+i] = phys + (i << IO_TLB_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
Becky Brucefb05a372008-12-22 10:26:09 -0800464 swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465
466 return dma_addr;
467}
468
469/*
470 * dma_addr is the kernel virtual address of the bounce buffer to unmap.
471 */
472static void
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500473do_unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474{
475 unsigned long flags;
476 int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
477 int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
Becky Brucebc40ac62008-12-22 10:26:08 -0800478 phys_addr_t phys = io_tlb_orig_addr[index];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
480 /*
481 * First, sync the memory before unmapping the entry
482 */
Becky Brucebc40ac62008-12-22 10:26:08 -0800483 if (phys && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
Becky Brucefb05a372008-12-22 10:26:09 -0800484 swiotlb_bounce(phys, dma_addr, size, DMA_FROM_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486 /*
487 * Return the buffer to the free list by setting the corresponding
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200488 * entries to indicate the number of contiguous entries available.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 * While returning the entries to the free list, we merge the entries
490 * with slots below and above the pool being returned.
491 */
492 spin_lock_irqsave(&io_tlb_lock, flags);
493 {
494 count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ?
495 io_tlb_list[index + nslots] : 0);
496 /*
497 * Step 1: return the slots to the free list, merging the
498 * slots with superceeding slots
499 */
500 for (i = index + nslots - 1; i >= index; i--)
501 io_tlb_list[i] = ++count;
502 /*
503 * Step 2: merge the returned slots with the preceding slots,
504 * if available (non zero)
505 */
506 for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--)
507 io_tlb_list[i] = ++count;
508 }
509 spin_unlock_irqrestore(&io_tlb_lock, flags);
510}
511
512static void
John W. Linvillede69e0f2005-09-29 14:44:57 -0700513sync_single(struct device *hwdev, char *dma_addr, size_t size,
514 int dir, int target)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515{
Becky Brucebc40ac62008-12-22 10:26:08 -0800516 int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
517 phys_addr_t phys = io_tlb_orig_addr[index];
518
519 phys += ((unsigned long)dma_addr & ((1 << IO_TLB_SHIFT) - 1));
Keir Fraserdf336d12007-07-21 04:37:24 -0700520
John W. Linvillede69e0f2005-09-29 14:44:57 -0700521 switch (target) {
522 case SYNC_FOR_CPU:
523 if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
Becky Brucefb05a372008-12-22 10:26:09 -0800524 swiotlb_bounce(phys, dma_addr, size, DMA_FROM_DEVICE);
Eric Sesterhenn34814542006-03-24 18:47:11 +0100525 else
526 BUG_ON(dir != DMA_TO_DEVICE);
John W. Linvillede69e0f2005-09-29 14:44:57 -0700527 break;
528 case SYNC_FOR_DEVICE:
529 if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
Becky Brucefb05a372008-12-22 10:26:09 -0800530 swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE);
Eric Sesterhenn34814542006-03-24 18:47:11 +0100531 else
532 BUG_ON(dir != DMA_FROM_DEVICE);
John W. Linvillede69e0f2005-09-29 14:44:57 -0700533 break;
534 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 BUG();
John W. Linvillede69e0f2005-09-29 14:44:57 -0700536 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537}
538
539void *
540swiotlb_alloc_coherent(struct device *hwdev, size_t size,
Al Viro06a54492005-10-21 03:21:03 -0400541 dma_addr_t *dma_handle, gfp_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542{
Jan Beulich563aaf02007-02-05 18:51:25 -0800543 dma_addr_t dev_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 void *ret;
545 int order = get_order(size);
Yang Hongyang284901a2009-04-06 19:01:15 -0700546 u64 dma_mask = DMA_BIT_MASK(32);
FUJITA Tomonori1e74f302008-11-17 16:24:34 +0900547
548 if (hwdev && hwdev->coherent_dma_mask)
549 dma_mask = hwdev->coherent_dma_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
Tony Luck25667d62007-03-06 13:31:45 -0800551 ret = (void *)__get_free_pages(flags, order);
Jan Beulichac2b3e62009-12-15 16:47:43 -0800552 if (ret && swiotlb_virt_to_bus(hwdev, ret) + size - 1 > dma_mask) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 /*
554 * The allocated memory isn't reachable by the device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 */
556 free_pages((unsigned long) ret, order);
557 ret = NULL;
558 }
559 if (!ret) {
560 /*
561 * We are either out of memory or the device can't DMA
Becky Bruceceb5ac32009-04-08 09:09:15 -0500562 * to GFP_DMA memory; fall back on map_single(), which
563 * will grab memory from the lowest available address range.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 */
Becky Brucebc40ac62008-12-22 10:26:08 -0800565 ret = map_single(hwdev, 0, size, DMA_FROM_DEVICE);
FUJITA Tomonori9dfda122008-09-08 18:53:48 +0900566 if (!ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 }
569
570 memset(ret, 0, size);
Jeremy Fitzhardinge70a7d3c2008-12-22 10:26:05 -0800571 dev_addr = swiotlb_virt_to_bus(hwdev, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
573 /* Confirm address can be DMA'd by device */
Jan Beulichac2b3e62009-12-15 16:47:43 -0800574 if (dev_addr + size - 1 > dma_mask) {
Jan Beulich563aaf02007-02-05 18:51:25 -0800575 printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
FUJITA Tomonori1e74f302008-11-17 16:24:34 +0900576 (unsigned long long)dma_mask,
Jan Beulich563aaf02007-02-05 18:51:25 -0800577 (unsigned long long)dev_addr);
FUJITA Tomonoria2b89b52008-10-23 18:42:03 +0900578
579 /* DMA_TO_DEVICE to avoid memcpy in unmap_single */
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500580 do_unmap_single(hwdev, ret, size, DMA_TO_DEVICE);
FUJITA Tomonoria2b89b52008-10-23 18:42:03 +0900581 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 }
583 *dma_handle = dev_addr;
584 return ret;
585}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900586EXPORT_SYMBOL(swiotlb_alloc_coherent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
588void
589swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900590 dma_addr_t dev_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900592 phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900593
David Brownellaa248862007-08-10 13:10:27 -0700594 WARN_ON(irqs_disabled());
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900595 if (!is_swiotlb_buffer(paddr))
596 free_pages((unsigned long)vaddr, get_order(size));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 else
598 /* DMA_TO_DEVICE to avoid memcpy in unmap_single */
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500599 do_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900601EXPORT_SYMBOL(swiotlb_free_coherent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602
603static void
604swiotlb_full(struct device *dev, size_t size, int dir, int do_panic)
605{
606 /*
607 * Ran out of IOMMU space for this operation. This is very bad.
608 * Unfortunately the drivers cannot handle this operation properly.
Tony Luck17e5ad62005-09-29 15:52:13 -0700609 * unless they check for dma_mapping_error (most don't)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 * When the mapping is small enough return a static buffer to limit
611 * the damage, or panic when the transfer is too big.
612 */
Jan Beulich563aaf02007-02-05 18:51:25 -0800613 printk(KERN_ERR "DMA: Out of SW-IOMMU space for %zu bytes at "
Kay Sievers94b32482009-01-06 10:44:37 -0800614 "device %s\n", size, dev ? dev_name(dev) : "?");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615
Casey Dahlinc7084b32009-08-20 16:27:56 -0700616 if (size <= io_tlb_overflow || !do_panic)
617 return;
618
619 if (dir == DMA_BIDIRECTIONAL)
620 panic("DMA: Random memory could be DMA accessed\n");
621 if (dir == DMA_FROM_DEVICE)
622 panic("DMA: Random memory could be DMA written\n");
623 if (dir == DMA_TO_DEVICE)
624 panic("DMA: Random memory could be DMA read\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625}
626
627/*
628 * Map a single buffer of the indicated size for DMA in streaming mode. The
Tony Luck17e5ad62005-09-29 15:52:13 -0700629 * physical address to use is returned.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 *
631 * Once the device is given the dma address, the device owns this memory until
Becky Bruceceb5ac32009-04-08 09:09:15 -0500632 * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 */
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900634dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
635 unsigned long offset, size_t size,
636 enum dma_data_direction dir,
637 struct dma_attrs *attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638{
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900639 phys_addr_t phys = page_to_phys(page) + offset;
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900640 dma_addr_t dev_addr = phys_to_dma(dev, phys);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 void *map;
642
Eric Sesterhenn34814542006-03-24 18:47:11 +0100643 BUG_ON(dir == DMA_NONE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 /*
Becky Bruceceb5ac32009-04-08 09:09:15 -0500645 * If the address happens to be in the device's DMA window,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 * we can safely return the device addr and not worry about bounce
647 * buffering it.
648 */
FUJITA Tomonorib9394642009-07-10 10:04:58 +0900649 if (dma_capable(dev, dev_addr, size) && !swiotlb_force)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 return dev_addr;
651
652 /*
653 * Oh well, have to allocate and map a bounce buffer.
654 */
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900655 map = map_single(dev, phys, size, dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 if (!map) {
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900657 swiotlb_full(dev, size, dir, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 map = io_tlb_overflow_buffer;
659 }
660
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900661 dev_addr = swiotlb_virt_to_bus(dev, map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
663 /*
664 * Ensure that the address returned is DMA'ble
665 */
FUJITA Tomonorib9394642009-07-10 10:04:58 +0900666 if (!dma_capable(dev, dev_addr, size))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 panic("map_single: bounce buffer is not DMA'ble");
668
669 return dev_addr;
670}
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900671EXPORT_SYMBOL_GPL(swiotlb_map_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672
673/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 * Unmap a single streaming mode DMA translation. The dma_addr and size must
Becky Bruceceb5ac32009-04-08 09:09:15 -0500675 * match what was provided for in a previous swiotlb_map_page call. All
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 * other usages are undefined.
677 *
678 * After this call, reads by the cpu to the buffer are guaranteed to see
679 * whatever the device wrote there.
680 */
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500681static void unmap_single(struct device *hwdev, dma_addr_t dev_addr,
682 size_t size, int dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683{
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900684 phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
Eric Sesterhenn34814542006-03-24 18:47:11 +0100686 BUG_ON(dir == DMA_NONE);
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500687
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900688 if (is_swiotlb_buffer(paddr)) {
689 do_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500690 return;
691 }
692
693 if (dir != DMA_FROM_DEVICE)
694 return;
695
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900696 /*
697 * phys_to_virt doesn't work with hihgmem page but we could
698 * call dma_mark_clean() with hihgmem page here. However, we
699 * are fine since dma_mark_clean() is null on POWERPC. We can
700 * make dma_mark_clean() take a physical address if necessary.
701 */
702 dma_mark_clean(phys_to_virt(paddr), size);
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500703}
704
705void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
706 size_t size, enum dma_data_direction dir,
707 struct dma_attrs *attrs)
708{
709 unmap_single(hwdev, dev_addr, size, dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710}
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900711EXPORT_SYMBOL_GPL(swiotlb_unmap_page);
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900712
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713/*
714 * Make physical memory consistent for a single streaming mode DMA translation
715 * after a transfer.
716 *
Becky Bruceceb5ac32009-04-08 09:09:15 -0500717 * If you perform a swiotlb_map_page() but wish to interrogate the buffer
Tony Luck17e5ad62005-09-29 15:52:13 -0700718 * using the cpu, yet do not wish to teardown the dma mapping, you must
719 * call this function before doing so. At the next point you give the dma
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 * address back to the card, you must first perform a
721 * swiotlb_dma_sync_for_device, and then the device again owns the buffer
722 */
Andrew Mortonbe6b0262007-02-12 00:52:17 -0800723static void
John W. Linville8270f3f2005-09-29 14:43:32 -0700724swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
John W. Linvillede69e0f2005-09-29 14:44:57 -0700725 size_t size, int dir, int target)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726{
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900727 phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
Eric Sesterhenn34814542006-03-24 18:47:11 +0100729 BUG_ON(dir == DMA_NONE);
Becky Bruce380d6872009-04-08 09:09:20 -0500730
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900731 if (is_swiotlb_buffer(paddr)) {
732 sync_single(hwdev, phys_to_virt(paddr), size, dir, target);
Becky Bruce380d6872009-04-08 09:09:20 -0500733 return;
734 }
735
736 if (dir != DMA_FROM_DEVICE)
737 return;
738
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900739 dma_mark_clean(phys_to_virt(paddr), size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740}
741
742void
John W. Linville8270f3f2005-09-29 14:43:32 -0700743swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900744 size_t size, enum dma_data_direction dir)
John W. Linville8270f3f2005-09-29 14:43:32 -0700745{
John W. Linvillede69e0f2005-09-29 14:44:57 -0700746 swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU);
John W. Linville8270f3f2005-09-29 14:43:32 -0700747}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900748EXPORT_SYMBOL(swiotlb_sync_single_for_cpu);
John W. Linville8270f3f2005-09-29 14:43:32 -0700749
750void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900752 size_t size, enum dma_data_direction dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753{
John W. Linvillede69e0f2005-09-29 14:44:57 -0700754 swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900756EXPORT_SYMBOL(swiotlb_sync_single_for_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
758/*
John W. Linville878a97c2005-09-29 14:44:23 -0700759 * Same as above, but for a sub-range of the mapping.
760 */
Andrew Mortonbe6b0262007-02-12 00:52:17 -0800761static void
John W. Linville878a97c2005-09-29 14:44:23 -0700762swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr,
John W. Linvillede69e0f2005-09-29 14:44:57 -0700763 unsigned long offset, size_t size,
764 int dir, int target)
John W. Linville878a97c2005-09-29 14:44:23 -0700765{
Becky Bruce380d6872009-04-08 09:09:20 -0500766 swiotlb_sync_single(hwdev, dev_addr + offset, size, dir, target);
John W. Linville878a97c2005-09-29 14:44:23 -0700767}
768
769void
770swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900771 unsigned long offset, size_t size,
772 enum dma_data_direction dir)
John W. Linville878a97c2005-09-29 14:44:23 -0700773{
John W. Linvillede69e0f2005-09-29 14:44:57 -0700774 swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
775 SYNC_FOR_CPU);
John W. Linville878a97c2005-09-29 14:44:23 -0700776}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900777EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu);
John W. Linville878a97c2005-09-29 14:44:23 -0700778
779void
780swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900781 unsigned long offset, size_t size,
782 enum dma_data_direction dir)
John W. Linville878a97c2005-09-29 14:44:23 -0700783{
John W. Linvillede69e0f2005-09-29 14:44:57 -0700784 swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir,
785 SYNC_FOR_DEVICE);
John W. Linville878a97c2005-09-29 14:44:23 -0700786}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900787EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device);
John W. Linville878a97c2005-09-29 14:44:23 -0700788
789/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 * Map a set of buffers described by scatterlist in streaming mode for DMA.
Becky Bruceceb5ac32009-04-08 09:09:15 -0500791 * This is the scatter-gather version of the above swiotlb_map_page
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 * interface. Here the scatter gather list elements are each tagged with the
793 * appropriate dma address and length. They are obtained via
794 * sg_dma_{address,length}(SG).
795 *
796 * NOTE: An implementation may be able to use a smaller number of
797 * DMA address/length pairs than there are SG table elements.
798 * (for example via virtual mapping capabilities)
799 * The routine returns the number of addr/length pairs actually
800 * used, at most nents.
801 *
Becky Bruceceb5ac32009-04-08 09:09:15 -0500802 * Device ownership issues as mentioned above for swiotlb_map_page are the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 * same here.
804 */
805int
Arthur Kepner309df0c2008-04-29 01:00:32 -0700806swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900807 enum dma_data_direction dir, struct dma_attrs *attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808{
Jens Axboedbfd49f2007-05-11 14:56:18 +0200809 struct scatterlist *sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 int i;
811
Eric Sesterhenn34814542006-03-24 18:47:11 +0100812 BUG_ON(dir == DMA_NONE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
Jens Axboedbfd49f2007-05-11 14:56:18 +0200814 for_each_sg(sgl, sg, nelems, i) {
Ian Campbell961d7d02009-01-09 18:32:10 +0000815 phys_addr_t paddr = sg_phys(sg);
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900816 dma_addr_t dev_addr = phys_to_dma(hwdev, paddr);
Becky Brucebc40ac62008-12-22 10:26:08 -0800817
FUJITA Tomonoricf56e3f2009-07-10 10:04:52 +0900818 if (swiotlb_force ||
FUJITA Tomonorib9394642009-07-10 10:04:58 +0900819 !dma_capable(hwdev, dev_addr, sg->length)) {
Becky Brucebc40ac62008-12-22 10:26:08 -0800820 void *map = map_single(hwdev, sg_phys(sg),
821 sg->length, dir);
Andi Kleen7e870232005-12-20 14:45:19 +0100822 if (!map) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 /* Don't panic here, we expect map_sg users
824 to do proper error handling. */
825 swiotlb_full(hwdev, sg->length, dir, 0);
Arthur Kepner309df0c2008-04-29 01:00:32 -0700826 swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
827 attrs);
Jens Axboedbfd49f2007-05-11 14:56:18 +0200828 sgl[0].dma_length = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 return 0;
830 }
Jeremy Fitzhardinge70a7d3c2008-12-22 10:26:05 -0800831 sg->dma_address = swiotlb_virt_to_bus(hwdev, map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 } else
833 sg->dma_address = dev_addr;
834 sg->dma_length = sg->length;
835 }
836 return nelems;
837}
Arthur Kepner309df0c2008-04-29 01:00:32 -0700838EXPORT_SYMBOL(swiotlb_map_sg_attrs);
839
840int
841swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
842 int dir)
843{
844 return swiotlb_map_sg_attrs(hwdev, sgl, nelems, dir, NULL);
845}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900846EXPORT_SYMBOL(swiotlb_map_sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
848/*
849 * Unmap a set of streaming mode DMA translations. Again, cpu read rules
Becky Bruceceb5ac32009-04-08 09:09:15 -0500850 * concerning calls here are the same as for swiotlb_unmap_page() above.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 */
852void
Arthur Kepner309df0c2008-04-29 01:00:32 -0700853swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900854 int nelems, enum dma_data_direction dir, struct dma_attrs *attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855{
Jens Axboedbfd49f2007-05-11 14:56:18 +0200856 struct scatterlist *sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 int i;
858
Eric Sesterhenn34814542006-03-24 18:47:11 +0100859 BUG_ON(dir == DMA_NONE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500861 for_each_sg(sgl, sg, nelems, i)
862 unmap_single(hwdev, sg->dma_address, sg->dma_length, dir);
863
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864}
Arthur Kepner309df0c2008-04-29 01:00:32 -0700865EXPORT_SYMBOL(swiotlb_unmap_sg_attrs);
866
867void
868swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
869 int dir)
870{
871 return swiotlb_unmap_sg_attrs(hwdev, sgl, nelems, dir, NULL);
872}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900873EXPORT_SYMBOL(swiotlb_unmap_sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874
875/*
876 * Make physical memory consistent for a set of streaming mode DMA translations
877 * after a transfer.
878 *
879 * The same as swiotlb_sync_single_* but for a scatter-gather list, same rules
880 * and usage.
881 */
Andrew Mortonbe6b0262007-02-12 00:52:17 -0800882static void
Jens Axboedbfd49f2007-05-11 14:56:18 +0200883swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
John W. Linvillede69e0f2005-09-29 14:44:57 -0700884 int nelems, int dir, int target)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885{
Jens Axboedbfd49f2007-05-11 14:56:18 +0200886 struct scatterlist *sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 int i;
888
Becky Bruce380d6872009-04-08 09:09:20 -0500889 for_each_sg(sgl, sg, nelems, i)
890 swiotlb_sync_single(hwdev, sg->dma_address,
John W. Linvillede69e0f2005-09-29 14:44:57 -0700891 sg->dma_length, dir, target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892}
893
894void
John W. Linville8270f3f2005-09-29 14:43:32 -0700895swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900896 int nelems, enum dma_data_direction dir)
John W. Linville8270f3f2005-09-29 14:43:32 -0700897{
John W. Linvillede69e0f2005-09-29 14:44:57 -0700898 swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU);
John W. Linville8270f3f2005-09-29 14:43:32 -0700899}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900900EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu);
John W. Linville8270f3f2005-09-29 14:43:32 -0700901
902void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900904 int nelems, enum dma_data_direction dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905{
John W. Linvillede69e0f2005-09-29 14:44:57 -0700906 swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900908EXPORT_SYMBOL(swiotlb_sync_sg_for_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909
910int
FUJITA Tomonori8d8bb392008-07-25 19:44:49 -0700911swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912{
Jeremy Fitzhardinge70a7d3c2008-12-22 10:26:05 -0800913 return (dma_addr == swiotlb_virt_to_bus(hwdev, io_tlb_overflow_buffer));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900915EXPORT_SYMBOL(swiotlb_dma_mapping_error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916
917/*
Tony Luck17e5ad62005-09-29 15:52:13 -0700918 * Return whether the given device DMA address mask can be supported
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 * properly. For example, if your device can only drive the low 24-bits
Tony Luck17e5ad62005-09-29 15:52:13 -0700920 * during bus mastering, then you would pass 0x00ffffff as the mask to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 * this function.
922 */
923int
Jan Beulich563aaf02007-02-05 18:51:25 -0800924swiotlb_dma_supported(struct device *hwdev, u64 mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925{
Jeremy Fitzhardinge70a7d3c2008-12-22 10:26:05 -0800926 return swiotlb_virt_to_bus(hwdev, io_tlb_end - 1) <= mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928EXPORT_SYMBOL(swiotlb_dma_supported);