blob: 93ca08b8a451411c3c4ac18f1f9525637e4a7140 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
33#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <asm/dma.h>
Tony Luck17e5ad62005-09-29 15:52:13 -070035#include <asm/scatterlist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37#include <linux/init.h>
38#include <linux/bootmem.h>
FUJITA Tomonoria8522502008-04-29 00:59:36 -070039#include <linux/iommu-helper.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41#define OFFSET(val,align) ((unsigned long) \
42 ( (val) & ( (align) - 1)))
43
Alex Williamson0b9afed2005-09-06 11:20:49 -060044#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
45
46/*
47 * Minimum IO TLB size to bother booting with. Systems with mainly
48 * 64bit capable cards will only lightly use the swiotlb. If we can't
49 * allocate a contiguous 1MB, we're probably in trouble anyway.
50 */
51#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
52
Linus Torvalds1da177e2005-04-16 15:20:36 -070053int swiotlb_force;
54
55/*
Konrad Rzeszutek Wilkbfc55012010-05-10 15:54:20 -040056 * Used to do a quick range check in swiotlb_tbl_unmap_single and
57 * swiotlb_tbl_sync_single_*, to see if the memory was in fact allocated by this
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 * API.
59 */
60static char *io_tlb_start, *io_tlb_end;
61
62/*
Uwe Kleine-Königb5950762010-11-01 15:38:34 -040063 * The number of IO TLB blocks (in groups of 64) between io_tlb_start and
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 * io_tlb_end. This is command line adjustable via setup_io_tlb_npages.
65 */
66static unsigned long io_tlb_nslabs;
67
68/*
69 * When the IOMMU overflows we return a fallback buffer. This sets the size.
70 */
71static unsigned long io_tlb_overflow = 32*1024;
72
FUJITA Tomonori03620b22010-08-02 23:48:06 +090073static void *io_tlb_overflow_buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
75/*
76 * This is a free list describing the number of free entries available from
77 * each index
78 */
79static unsigned int *io_tlb_list;
80static unsigned int io_tlb_index;
81
82/*
83 * We need to save away the original address corresponding to a mapped entry
84 * for the sync operations.
85 */
Becky Brucebc40ac62008-12-22 10:26:08 -080086static phys_addr_t *io_tlb_orig_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88/*
89 * Protect the above data structures in the map and unmap calls
90 */
91static DEFINE_SPINLOCK(io_tlb_lock);
92
FUJITA Tomonori5740afd2009-11-10 19:46:18 +090093static int late_alloc;
94
Linus Torvalds1da177e2005-04-16 15:20:36 -070095static int __init
96setup_io_tlb_npages(char *str)
97{
98 if (isdigit(*str)) {
Alex Williamsone8579e72005-08-04 13:06:00 -070099 io_tlb_nslabs = simple_strtoul(str, &str, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 /* avoid tail segment of size < IO_TLB_SEGSIZE */
101 io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
102 }
103 if (*str == ',')
104 ++str;
FUJITA Tomonorib18485e2009-11-12 00:03:28 +0900105 if (!strcmp(str, "force"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 swiotlb_force = 1;
FUJITA Tomonorib18485e2009-11-12 00:03:28 +0900107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 return 1;
109}
110__setup("swiotlb=", setup_io_tlb_npages);
111/* make io_tlb_overflow tunable too? */
112
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900113/* Note that this doesn't work with highmem page */
Jeremy Fitzhardinge70a7d3c2008-12-22 10:26:05 -0800114static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
115 volatile void *address)
Ian Campbelle08e1f72008-12-16 12:17:30 -0800116{
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900117 return phys_to_dma(hwdev, virt_to_phys(address));
Ian Campbelle08e1f72008-12-16 12:17:30 -0800118}
119
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900120void swiotlb_print_info(void)
Ian Campbell2e5b2b82008-12-16 12:17:34 -0800121{
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900122 unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;
Ian Campbell2e5b2b82008-12-16 12:17:34 -0800123 phys_addr_t pstart, pend;
Ian Campbell2e5b2b82008-12-16 12:17:34 -0800124
125 pstart = virt_to_phys(io_tlb_start);
126 pend = virt_to_phys(io_tlb_end);
127
Ian Campbell2e5b2b82008-12-16 12:17:34 -0800128 printk(KERN_INFO "Placing %luMB software IO TLB between %p - %p\n",
129 bytes >> 20, io_tlb_start, io_tlb_end);
Jeremy Fitzhardinge70a7d3c2008-12-22 10:26:05 -0800130 printk(KERN_INFO "software IO TLB at phys %#llx - %#llx\n",
131 (unsigned long long)pstart,
132 (unsigned long long)pend);
Ian Campbell2e5b2b82008-12-16 12:17:34 -0800133}
134
FUJITA Tomonoriabbceff2010-05-10 15:15:12 -0400135void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136{
Jan Beulich563aaf02007-02-05 18:51:25 -0800137 unsigned long i, bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
FUJITA Tomonoriabbceff2010-05-10 15:15:12 -0400139 bytes = nslabs << IO_TLB_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
FUJITA Tomonoriabbceff2010-05-10 15:15:12 -0400141 io_tlb_nslabs = nslabs;
142 io_tlb_start = tlb;
Jan Beulich563aaf02007-02-05 18:51:25 -0800143 io_tlb_end = io_tlb_start + bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
145 /*
146 * Allocate and initialize the free list array. This array is used
147 * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
148 * between io_tlb_start and io_tlb_end.
149 */
Yinghai Lue79f86b2010-10-11 10:40:25 -0700150 io_tlb_list = alloc_bootmem_pages(PAGE_ALIGN(io_tlb_nslabs * sizeof(int)));
Tony Luck25667d62007-03-06 13:31:45 -0800151 for (i = 0; i < io_tlb_nslabs; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
153 io_tlb_index = 0;
Yinghai Lue79f86b2010-10-11 10:40:25 -0700154 io_tlb_orig_addr = alloc_bootmem_pages(PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155
156 /*
157 * Get the overflow emergency buffer
158 */
Yinghai Lue79f86b2010-10-11 10:40:25 -0700159 io_tlb_overflow_buffer = alloc_bootmem_low_pages(PAGE_ALIGN(io_tlb_overflow));
Jan Beulich563aaf02007-02-05 18:51:25 -0800160 if (!io_tlb_overflow_buffer)
161 panic("Cannot allocate SWIOTLB overflow buffer!\n");
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900162 if (verbose)
163 swiotlb_print_info();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164}
165
FUJITA Tomonoriabbceff2010-05-10 15:15:12 -0400166/*
167 * Statically reserve bounce buffer space and initialize bounce buffer data
168 * structures for the software IO TLB used to implement the DMA API.
169 */
170void __init
171swiotlb_init_with_default_size(size_t default_size, int verbose)
172{
173 unsigned long bytes;
174
175 if (!io_tlb_nslabs) {
176 io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
177 io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
178 }
179
180 bytes = io_tlb_nslabs << IO_TLB_SHIFT;
181
182 /*
183 * Get IO TLB memory from the low pages
184 */
Yinghai Lue79f86b2010-10-11 10:40:25 -0700185 io_tlb_start = alloc_bootmem_low_pages(PAGE_ALIGN(bytes));
FUJITA Tomonoriabbceff2010-05-10 15:15:12 -0400186 if (!io_tlb_start)
187 panic("Cannot allocate SWIOTLB buffer");
188
189 swiotlb_init_with_tbl(io_tlb_start, io_tlb_nslabs, verbose);
190}
191
Jan Beulich563aaf02007-02-05 18:51:25 -0800192void __init
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900193swiotlb_init(int verbose)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194{
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900195 swiotlb_init_with_default_size(64 * (1<<20), verbose); /* default to 64MB */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196}
197
Alex Williamson0b9afed2005-09-06 11:20:49 -0600198/*
199 * Systems with larger DMA zones (those that don't support ISA) can
200 * initialize the swiotlb later using the slab allocator if needed.
201 * This should be just like above, but with some error catching.
202 */
203int
Jan Beulich563aaf02007-02-05 18:51:25 -0800204swiotlb_late_init_with_default_size(size_t default_size)
Alex Williamson0b9afed2005-09-06 11:20:49 -0600205{
Jan Beulich563aaf02007-02-05 18:51:25 -0800206 unsigned long i, bytes, req_nslabs = io_tlb_nslabs;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600207 unsigned int order;
208
209 if (!io_tlb_nslabs) {
210 io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
211 io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
212 }
213
214 /*
215 * Get IO TLB memory from the low pages
216 */
Jan Beulich563aaf02007-02-05 18:51:25 -0800217 order = get_order(io_tlb_nslabs << IO_TLB_SHIFT);
Alex Williamson0b9afed2005-09-06 11:20:49 -0600218 io_tlb_nslabs = SLABS_PER_PAGE << order;
Jan Beulich563aaf02007-02-05 18:51:25 -0800219 bytes = io_tlb_nslabs << IO_TLB_SHIFT;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600220
221 while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
FUJITA Tomonoribb521962009-07-10 10:04:51 +0900222 io_tlb_start = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
223 order);
Alex Williamson0b9afed2005-09-06 11:20:49 -0600224 if (io_tlb_start)
225 break;
226 order--;
227 }
228
229 if (!io_tlb_start)
230 goto cleanup1;
231
Jan Beulich563aaf02007-02-05 18:51:25 -0800232 if (order != get_order(bytes)) {
Alex Williamson0b9afed2005-09-06 11:20:49 -0600233 printk(KERN_WARNING "Warning: only able to allocate %ld MB "
234 "for software IO TLB\n", (PAGE_SIZE << order) >> 20);
235 io_tlb_nslabs = SLABS_PER_PAGE << order;
Jan Beulich563aaf02007-02-05 18:51:25 -0800236 bytes = io_tlb_nslabs << IO_TLB_SHIFT;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600237 }
Jan Beulich563aaf02007-02-05 18:51:25 -0800238 io_tlb_end = io_tlb_start + bytes;
239 memset(io_tlb_start, 0, bytes);
Alex Williamson0b9afed2005-09-06 11:20:49 -0600240
241 /*
242 * Allocate and initialize the free list array. This array is used
243 * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
244 * between io_tlb_start and io_tlb_end.
245 */
246 io_tlb_list = (unsigned int *)__get_free_pages(GFP_KERNEL,
247 get_order(io_tlb_nslabs * sizeof(int)));
248 if (!io_tlb_list)
249 goto cleanup2;
250
251 for (i = 0; i < io_tlb_nslabs; i++)
252 io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
253 io_tlb_index = 0;
254
Becky Brucebc40ac62008-12-22 10:26:08 -0800255 io_tlb_orig_addr = (phys_addr_t *)
256 __get_free_pages(GFP_KERNEL,
257 get_order(io_tlb_nslabs *
258 sizeof(phys_addr_t)));
Alex Williamson0b9afed2005-09-06 11:20:49 -0600259 if (!io_tlb_orig_addr)
260 goto cleanup3;
261
Becky Brucebc40ac62008-12-22 10:26:08 -0800262 memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(phys_addr_t));
Alex Williamson0b9afed2005-09-06 11:20:49 -0600263
264 /*
265 * Get the overflow emergency buffer
266 */
267 io_tlb_overflow_buffer = (void *)__get_free_pages(GFP_DMA,
268 get_order(io_tlb_overflow));
269 if (!io_tlb_overflow_buffer)
270 goto cleanup4;
271
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900272 swiotlb_print_info();
Alex Williamson0b9afed2005-09-06 11:20:49 -0600273
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900274 late_alloc = 1;
275
Alex Williamson0b9afed2005-09-06 11:20:49 -0600276 return 0;
277
278cleanup4:
Becky Brucebc40ac62008-12-22 10:26:08 -0800279 free_pages((unsigned long)io_tlb_orig_addr,
280 get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
Alex Williamson0b9afed2005-09-06 11:20:49 -0600281 io_tlb_orig_addr = NULL;
282cleanup3:
Tony Luck25667d62007-03-06 13:31:45 -0800283 free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
284 sizeof(int)));
Alex Williamson0b9afed2005-09-06 11:20:49 -0600285 io_tlb_list = NULL;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600286cleanup2:
Jan Beulich563aaf02007-02-05 18:51:25 -0800287 io_tlb_end = NULL;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600288 free_pages((unsigned long)io_tlb_start, order);
289 io_tlb_start = NULL;
290cleanup1:
291 io_tlb_nslabs = req_nslabs;
292 return -ENOMEM;
293}
294
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900295void __init swiotlb_free(void)
296{
297 if (!io_tlb_overflow_buffer)
298 return;
299
300 if (late_alloc) {
301 free_pages((unsigned long)io_tlb_overflow_buffer,
302 get_order(io_tlb_overflow));
303 free_pages((unsigned long)io_tlb_orig_addr,
304 get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
305 free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
306 sizeof(int)));
307 free_pages((unsigned long)io_tlb_start,
308 get_order(io_tlb_nslabs << IO_TLB_SHIFT));
309 } else {
310 free_bootmem_late(__pa(io_tlb_overflow_buffer),
Yinghai Lue79f86b2010-10-11 10:40:25 -0700311 PAGE_ALIGN(io_tlb_overflow));
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900312 free_bootmem_late(__pa(io_tlb_orig_addr),
Yinghai Lue79f86b2010-10-11 10:40:25 -0700313 PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900314 free_bootmem_late(__pa(io_tlb_list),
Yinghai Lue79f86b2010-10-11 10:40:25 -0700315 PAGE_ALIGN(io_tlb_nslabs * sizeof(int)));
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900316 free_bootmem_late(__pa(io_tlb_start),
Yinghai Lue79f86b2010-10-11 10:40:25 -0700317 PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900318 }
319}
320
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900321static int is_swiotlb_buffer(phys_addr_t paddr)
FUJITA Tomonori640aebf2008-09-08 18:53:50 +0900322{
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900323 return paddr >= virt_to_phys(io_tlb_start) &&
324 paddr < virt_to_phys(io_tlb_end);
FUJITA Tomonori640aebf2008-09-08 18:53:50 +0900325}
326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327/*
Becky Brucefb05a372008-12-22 10:26:09 -0800328 * Bounce: copy the swiotlb buffer back to the original dma location
329 */
Konrad Rzeszutek Wilkd7ef1532010-05-28 11:37:10 -0400330void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
331 enum dma_data_direction dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332{
Becky Brucefb05a372008-12-22 10:26:09 -0800333 unsigned long pfn = PFN_DOWN(phys);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
Becky Brucefb05a372008-12-22 10:26:09 -0800335 if (PageHighMem(pfn_to_page(pfn))) {
336 /* The buffer does not have a mapping. Map it in and copy */
337 unsigned int offset = phys & ~PAGE_MASK;
338 char *buffer;
339 unsigned int sz = 0;
340 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
Becky Brucefb05a372008-12-22 10:26:09 -0800342 while (size) {
Becky Bruce67131ad2009-04-08 09:09:16 -0500343 sz = min_t(size_t, PAGE_SIZE - offset, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
Becky Brucefb05a372008-12-22 10:26:09 -0800345 local_irq_save(flags);
346 buffer = kmap_atomic(pfn_to_page(pfn),
347 KM_BOUNCE_READ);
348 if (dir == DMA_TO_DEVICE)
349 memcpy(dma_addr, buffer + offset, sz);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 else
Becky Brucefb05a372008-12-22 10:26:09 -0800351 memcpy(buffer + offset, dma_addr, sz);
352 kunmap_atomic(buffer, KM_BOUNCE_READ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 local_irq_restore(flags);
Becky Brucefb05a372008-12-22 10:26:09 -0800354
355 size -= sz;
356 pfn++;
357 dma_addr += sz;
358 offset = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 }
360 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 if (dir == DMA_TO_DEVICE)
Becky Brucefb05a372008-12-22 10:26:09 -0800362 memcpy(dma_addr, phys_to_virt(phys), size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 else
Becky Brucefb05a372008-12-22 10:26:09 -0800364 memcpy(phys_to_virt(phys), dma_addr, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 }
366}
Konrad Rzeszutek Wilkd7ef1532010-05-28 11:37:10 -0400367EXPORT_SYMBOL_GPL(swiotlb_bounce);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
FUJITA Tomonorieb605a52010-05-10 15:14:54 -0400369void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
Konrad Rzeszutek Wilk22d48262010-05-10 15:01:15 -0500370 phys_addr_t phys, size_t size,
371 enum dma_data_direction dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372{
373 unsigned long flags;
374 char *dma_addr;
375 unsigned int nslots, stride, index, wrap;
376 int i;
FUJITA Tomonori681cc5c2008-02-04 22:28:16 -0800377 unsigned long mask;
378 unsigned long offset_slots;
379 unsigned long max_slots;
380
381 mask = dma_get_seg_boundary(hwdev);
FUJITA Tomonori681cc5c2008-02-04 22:28:16 -0800382
FUJITA Tomonorieb605a52010-05-10 15:14:54 -0400383 tbl_dma_addr &= mask;
384
385 offset_slots = ALIGN(tbl_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
Ian Campbella5ddde42008-12-16 12:17:29 -0800386
387 /*
388 * Carefully handle integer overflow which can occur when mask == ~0UL.
389 */
Jan Beulichb15a3892008-03-13 09:13:30 +0000390 max_slots = mask + 1
391 ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT
392 : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
394 /*
395 * For mappings greater than a page, we limit the stride (and
396 * hence alignment) to a page size.
397 */
398 nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
399 if (size > PAGE_SIZE)
400 stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT));
401 else
402 stride = 1;
403
Eric Sesterhenn34814542006-03-24 18:47:11 +0100404 BUG_ON(!nslots);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
406 /*
407 * Find suitable number of IO TLB entries size that will fit this
408 * request and allocate a buffer from that IO TLB pool.
409 */
410 spin_lock_irqsave(&io_tlb_lock, flags);
Andrew Mortona7133a12008-04-29 00:59:36 -0700411 index = ALIGN(io_tlb_index, stride);
412 if (index >= io_tlb_nslabs)
413 index = 0;
414 wrap = index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
Andrew Mortona7133a12008-04-29 00:59:36 -0700416 do {
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700417 while (iommu_is_span_boundary(index, nslots, offset_slots,
418 max_slots)) {
Jan Beulichb15a3892008-03-13 09:13:30 +0000419 index += stride;
420 if (index >= io_tlb_nslabs)
421 index = 0;
Andrew Mortona7133a12008-04-29 00:59:36 -0700422 if (index == wrap)
423 goto not_found;
424 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Andrew Mortona7133a12008-04-29 00:59:36 -0700426 /*
427 * If we find a slot that indicates we have 'nslots' number of
428 * contiguous buffers, we allocate the buffers from that slot
429 * and mark the entries as '0' indicating unavailable.
430 */
431 if (io_tlb_list[index] >= nslots) {
432 int count = 0;
433
434 for (i = index; i < (int) (index + nslots); i++)
435 io_tlb_list[i] = 0;
436 for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE - 1) && io_tlb_list[i]; i--)
437 io_tlb_list[i] = ++count;
438 dma_addr = io_tlb_start + (index << IO_TLB_SHIFT);
439
440 /*
441 * Update the indices to avoid searching in the next
442 * round.
443 */
444 io_tlb_index = ((index + nslots) < io_tlb_nslabs
445 ? (index + nslots) : 0);
446
447 goto found;
448 }
449 index += stride;
450 if (index >= io_tlb_nslabs)
451 index = 0;
452 } while (index != wrap);
453
454not_found:
455 spin_unlock_irqrestore(&io_tlb_lock, flags);
456 return NULL;
457found:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 spin_unlock_irqrestore(&io_tlb_lock, flags);
459
460 /*
461 * Save away the mapping from the original address to the DMA address.
462 * This is needed when we sync the memory. Then we sync the buffer if
463 * needed.
464 */
Becky Brucebc40ac62008-12-22 10:26:08 -0800465 for (i = 0; i < nslots; i++)
466 io_tlb_orig_addr[index+i] = phys + (i << IO_TLB_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
Becky Brucefb05a372008-12-22 10:26:09 -0800468 swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
470 return dma_addr;
471}
Konrad Rzeszutek Wilkd7ef1532010-05-28 11:37:10 -0400472EXPORT_SYMBOL_GPL(swiotlb_tbl_map_single);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
474/*
FUJITA Tomonorieb605a52010-05-10 15:14:54 -0400475 * Allocates bounce buffer and returns its kernel virtual address.
476 */
477
478static void *
Konrad Rzeszutek Wilk22d48262010-05-10 15:01:15 -0500479map_single(struct device *hwdev, phys_addr_t phys, size_t size,
480 enum dma_data_direction dir)
FUJITA Tomonorieb605a52010-05-10 15:14:54 -0400481{
482 dma_addr_t start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start);
483
484 return swiotlb_tbl_map_single(hwdev, start_dma_addr, phys, size, dir);
485}
486
487/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 * dma_addr is the kernel virtual address of the bounce buffer to unmap.
489 */
Konrad Rzeszutek Wilkd7ef1532010-05-28 11:37:10 -0400490void
Konrad Rzeszutek Wilkbfc55012010-05-10 15:54:20 -0400491swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr, size_t size,
Konrad Rzeszutek Wilk22d48262010-05-10 15:01:15 -0500492 enum dma_data_direction dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493{
494 unsigned long flags;
495 int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
496 int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
Becky Brucebc40ac62008-12-22 10:26:08 -0800497 phys_addr_t phys = io_tlb_orig_addr[index];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498
499 /*
500 * First, sync the memory before unmapping the entry
501 */
Becky Brucebc40ac62008-12-22 10:26:08 -0800502 if (phys && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
Becky Brucefb05a372008-12-22 10:26:09 -0800503 swiotlb_bounce(phys, dma_addr, size, DMA_FROM_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
505 /*
506 * Return the buffer to the free list by setting the corresponding
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200507 * entries to indicate the number of contiguous entries available.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 * While returning the entries to the free list, we merge the entries
509 * with slots below and above the pool being returned.
510 */
511 spin_lock_irqsave(&io_tlb_lock, flags);
512 {
513 count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ?
514 io_tlb_list[index + nslots] : 0);
515 /*
516 * Step 1: return the slots to the free list, merging the
517 * slots with superceeding slots
518 */
519 for (i = index + nslots - 1; i >= index; i--)
520 io_tlb_list[i] = ++count;
521 /*
522 * Step 2: merge the returned slots with the preceding slots,
523 * if available (non zero)
524 */
525 for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--)
526 io_tlb_list[i] = ++count;
527 }
528 spin_unlock_irqrestore(&io_tlb_lock, flags);
529}
Konrad Rzeszutek Wilkd7ef1532010-05-28 11:37:10 -0400530EXPORT_SYMBOL_GPL(swiotlb_tbl_unmap_single);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
Konrad Rzeszutek Wilkd7ef1532010-05-28 11:37:10 -0400532void
Konrad Rzeszutek Wilkbfc55012010-05-10 15:54:20 -0400533swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr, size_t size,
Konrad Rzeszutek Wilkd7ef1532010-05-28 11:37:10 -0400534 enum dma_data_direction dir,
535 enum dma_sync_target target)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536{
Becky Brucebc40ac62008-12-22 10:26:08 -0800537 int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
538 phys_addr_t phys = io_tlb_orig_addr[index];
539
540 phys += ((unsigned long)dma_addr & ((1 << IO_TLB_SHIFT) - 1));
Keir Fraserdf336d12007-07-21 04:37:24 -0700541
John W. Linvillede69e0f2005-09-29 14:44:57 -0700542 switch (target) {
543 case SYNC_FOR_CPU:
544 if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
Becky Brucefb05a372008-12-22 10:26:09 -0800545 swiotlb_bounce(phys, dma_addr, size, DMA_FROM_DEVICE);
Eric Sesterhenn34814542006-03-24 18:47:11 +0100546 else
547 BUG_ON(dir != DMA_TO_DEVICE);
John W. Linvillede69e0f2005-09-29 14:44:57 -0700548 break;
549 case SYNC_FOR_DEVICE:
550 if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
Becky Brucefb05a372008-12-22 10:26:09 -0800551 swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE);
Eric Sesterhenn34814542006-03-24 18:47:11 +0100552 else
553 BUG_ON(dir != DMA_FROM_DEVICE);
John W. Linvillede69e0f2005-09-29 14:44:57 -0700554 break;
555 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 BUG();
John W. Linvillede69e0f2005-09-29 14:44:57 -0700557 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558}
Konrad Rzeszutek Wilkd7ef1532010-05-28 11:37:10 -0400559EXPORT_SYMBOL_GPL(swiotlb_tbl_sync_single);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560
561void *
562swiotlb_alloc_coherent(struct device *hwdev, size_t size,
Al Viro06a54492005-10-21 03:21:03 -0400563 dma_addr_t *dma_handle, gfp_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564{
Jan Beulich563aaf02007-02-05 18:51:25 -0800565 dma_addr_t dev_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 void *ret;
567 int order = get_order(size);
Yang Hongyang284901a2009-04-06 19:01:15 -0700568 u64 dma_mask = DMA_BIT_MASK(32);
FUJITA Tomonori1e74f302008-11-17 16:24:34 +0900569
570 if (hwdev && hwdev->coherent_dma_mask)
571 dma_mask = hwdev->coherent_dma_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Tony Luck25667d62007-03-06 13:31:45 -0800573 ret = (void *)__get_free_pages(flags, order);
Jan Beulichac2b3e62009-12-15 16:47:43 -0800574 if (ret && swiotlb_virt_to_bus(hwdev, ret) + size - 1 > dma_mask) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 /*
576 * The allocated memory isn't reachable by the device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 */
578 free_pages((unsigned long) ret, order);
579 ret = NULL;
580 }
581 if (!ret) {
582 /*
Konrad Rzeszutek Wilkbfc55012010-05-10 15:54:20 -0400583 * We are either out of memory or the device can't DMA to
584 * GFP_DMA memory; fall back on map_single(), which
Becky Bruceceb5ac32009-04-08 09:09:15 -0500585 * will grab memory from the lowest available address range.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 */
Becky Brucebc40ac62008-12-22 10:26:08 -0800587 ret = map_single(hwdev, 0, size, DMA_FROM_DEVICE);
FUJITA Tomonori9dfda122008-09-08 18:53:48 +0900588 if (!ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 }
591
592 memset(ret, 0, size);
Jeremy Fitzhardinge70a7d3c2008-12-22 10:26:05 -0800593 dev_addr = swiotlb_virt_to_bus(hwdev, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
595 /* Confirm address can be DMA'd by device */
Jan Beulichac2b3e62009-12-15 16:47:43 -0800596 if (dev_addr + size - 1 > dma_mask) {
Jan Beulich563aaf02007-02-05 18:51:25 -0800597 printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
FUJITA Tomonori1e74f302008-11-17 16:24:34 +0900598 (unsigned long long)dma_mask,
Jan Beulich563aaf02007-02-05 18:51:25 -0800599 (unsigned long long)dev_addr);
FUJITA Tomonoria2b89b52008-10-23 18:42:03 +0900600
601 /* DMA_TO_DEVICE to avoid memcpy in unmap_single */
Konrad Rzeszutek Wilkbfc55012010-05-10 15:54:20 -0400602 swiotlb_tbl_unmap_single(hwdev, ret, size, DMA_TO_DEVICE);
FUJITA Tomonoria2b89b52008-10-23 18:42:03 +0900603 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 }
605 *dma_handle = dev_addr;
606 return ret;
607}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900608EXPORT_SYMBOL(swiotlb_alloc_coherent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
610void
611swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900612 dma_addr_t dev_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613{
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900614 phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900615
David Brownellaa248862007-08-10 13:10:27 -0700616 WARN_ON(irqs_disabled());
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900617 if (!is_swiotlb_buffer(paddr))
618 free_pages((unsigned long)vaddr, get_order(size));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 else
Konrad Rzeszutek Wilkbfc55012010-05-10 15:54:20 -0400620 /* DMA_TO_DEVICE to avoid memcpy in swiotlb_tbl_unmap_single */
621 swiotlb_tbl_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900623EXPORT_SYMBOL(swiotlb_free_coherent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
625static void
Konrad Rzeszutek Wilk22d48262010-05-10 15:01:15 -0500626swiotlb_full(struct device *dev, size_t size, enum dma_data_direction dir,
627 int do_panic)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628{
629 /*
630 * Ran out of IOMMU space for this operation. This is very bad.
631 * Unfortunately the drivers cannot handle this operation properly.
Tony Luck17e5ad62005-09-29 15:52:13 -0700632 * unless they check for dma_mapping_error (most don't)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 * When the mapping is small enough return a static buffer to limit
634 * the damage, or panic when the transfer is too big.
635 */
Jan Beulich563aaf02007-02-05 18:51:25 -0800636 printk(KERN_ERR "DMA: Out of SW-IOMMU space for %zu bytes at "
Kay Sievers94b32482009-01-06 10:44:37 -0800637 "device %s\n", size, dev ? dev_name(dev) : "?");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
Casey Dahlinc7084b32009-08-20 16:27:56 -0700639 if (size <= io_tlb_overflow || !do_panic)
640 return;
641
642 if (dir == DMA_BIDIRECTIONAL)
643 panic("DMA: Random memory could be DMA accessed\n");
644 if (dir == DMA_FROM_DEVICE)
645 panic("DMA: Random memory could be DMA written\n");
646 if (dir == DMA_TO_DEVICE)
647 panic("DMA: Random memory could be DMA read\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648}
649
650/*
651 * Map a single buffer of the indicated size for DMA in streaming mode. The
Tony Luck17e5ad62005-09-29 15:52:13 -0700652 * physical address to use is returned.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 *
654 * Once the device is given the dma address, the device owns this memory until
Becky Bruceceb5ac32009-04-08 09:09:15 -0500655 * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 */
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900657dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
658 unsigned long offset, size_t size,
659 enum dma_data_direction dir,
660 struct dma_attrs *attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661{
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900662 phys_addr_t phys = page_to_phys(page) + offset;
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900663 dma_addr_t dev_addr = phys_to_dma(dev, phys);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 void *map;
665
Eric Sesterhenn34814542006-03-24 18:47:11 +0100666 BUG_ON(dir == DMA_NONE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 /*
Becky Bruceceb5ac32009-04-08 09:09:15 -0500668 * If the address happens to be in the device's DMA window,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 * we can safely return the device addr and not worry about bounce
670 * buffering it.
671 */
FUJITA Tomonorib9394642009-07-10 10:04:58 +0900672 if (dma_capable(dev, dev_addr, size) && !swiotlb_force)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 return dev_addr;
674
675 /*
676 * Oh well, have to allocate and map a bounce buffer.
677 */
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900678 map = map_single(dev, phys, size, dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 if (!map) {
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900680 swiotlb_full(dev, size, dir, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 map = io_tlb_overflow_buffer;
682 }
683
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900684 dev_addr = swiotlb_virt_to_bus(dev, map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
686 /*
687 * Ensure that the address returned is DMA'ble
688 */
FUJITA Tomonorifba99fa2011-02-25 14:44:16 -0800689 if (!dma_capable(dev, dev_addr, size)) {
690 swiotlb_tbl_unmap_single(dev, map, size, dir);
691 dev_addr = swiotlb_virt_to_bus(dev, io_tlb_overflow_buffer);
692 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693
694 return dev_addr;
695}
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900696EXPORT_SYMBOL_GPL(swiotlb_map_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
698/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 * Unmap a single streaming mode DMA translation. The dma_addr and size must
Becky Bruceceb5ac32009-04-08 09:09:15 -0500700 * match what was provided for in a previous swiotlb_map_page call. All
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 * other usages are undefined.
702 *
703 * After this call, reads by the cpu to the buffer are guaranteed to see
704 * whatever the device wrote there.
705 */
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500706static void unmap_single(struct device *hwdev, dma_addr_t dev_addr,
Konrad Rzeszutek Wilk22d48262010-05-10 15:01:15 -0500707 size_t size, enum dma_data_direction dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708{
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900709 phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710
Eric Sesterhenn34814542006-03-24 18:47:11 +0100711 BUG_ON(dir == DMA_NONE);
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500712
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900713 if (is_swiotlb_buffer(paddr)) {
Konrad Rzeszutek Wilkbfc55012010-05-10 15:54:20 -0400714 swiotlb_tbl_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500715 return;
716 }
717
718 if (dir != DMA_FROM_DEVICE)
719 return;
720
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900721 /*
722 * phys_to_virt doesn't work with hihgmem page but we could
723 * call dma_mark_clean() with hihgmem page here. However, we
724 * are fine since dma_mark_clean() is null on POWERPC. We can
725 * make dma_mark_clean() take a physical address if necessary.
726 */
727 dma_mark_clean(phys_to_virt(paddr), size);
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500728}
729
730void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
731 size_t size, enum dma_data_direction dir,
732 struct dma_attrs *attrs)
733{
734 unmap_single(hwdev, dev_addr, size, dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735}
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900736EXPORT_SYMBOL_GPL(swiotlb_unmap_page);
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900737
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738/*
739 * Make physical memory consistent for a single streaming mode DMA translation
740 * after a transfer.
741 *
Becky Bruceceb5ac32009-04-08 09:09:15 -0500742 * If you perform a swiotlb_map_page() but wish to interrogate the buffer
Tony Luck17e5ad62005-09-29 15:52:13 -0700743 * using the cpu, yet do not wish to teardown the dma mapping, you must
744 * call this function before doing so. At the next point you give the dma
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 * address back to the card, you must first perform a
746 * swiotlb_dma_sync_for_device, and then the device again owns the buffer
747 */
Andrew Mortonbe6b0262007-02-12 00:52:17 -0800748static void
John W. Linville8270f3f2005-09-29 14:43:32 -0700749swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
Konrad Rzeszutek Wilkd7ef1532010-05-28 11:37:10 -0400750 size_t size, enum dma_data_direction dir,
751 enum dma_sync_target target)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752{
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900753 phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754
Eric Sesterhenn34814542006-03-24 18:47:11 +0100755 BUG_ON(dir == DMA_NONE);
Becky Bruce380d6872009-04-08 09:09:20 -0500756
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900757 if (is_swiotlb_buffer(paddr)) {
Konrad Rzeszutek Wilkbfc55012010-05-10 15:54:20 -0400758 swiotlb_tbl_sync_single(hwdev, phys_to_virt(paddr), size, dir,
759 target);
Becky Bruce380d6872009-04-08 09:09:20 -0500760 return;
761 }
762
763 if (dir != DMA_FROM_DEVICE)
764 return;
765
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900766 dma_mark_clean(phys_to_virt(paddr), size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767}
768
769void
John W. Linville8270f3f2005-09-29 14:43:32 -0700770swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900771 size_t size, enum dma_data_direction dir)
John W. Linville8270f3f2005-09-29 14:43:32 -0700772{
John W. Linvillede69e0f2005-09-29 14:44:57 -0700773 swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU);
John W. Linville8270f3f2005-09-29 14:43:32 -0700774}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900775EXPORT_SYMBOL(swiotlb_sync_single_for_cpu);
John W. Linville8270f3f2005-09-29 14:43:32 -0700776
777void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900779 size_t size, enum dma_data_direction dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780{
John W. Linvillede69e0f2005-09-29 14:44:57 -0700781 swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900783EXPORT_SYMBOL(swiotlb_sync_single_for_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
785/*
786 * Map a set of buffers described by scatterlist in streaming mode for DMA.
Becky Bruceceb5ac32009-04-08 09:09:15 -0500787 * This is the scatter-gather version of the above swiotlb_map_page
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 * interface. Here the scatter gather list elements are each tagged with the
789 * appropriate dma address and length. They are obtained via
790 * sg_dma_{address,length}(SG).
791 *
792 * NOTE: An implementation may be able to use a smaller number of
793 * DMA address/length pairs than there are SG table elements.
794 * (for example via virtual mapping capabilities)
795 * The routine returns the number of addr/length pairs actually
796 * used, at most nents.
797 *
Becky Bruceceb5ac32009-04-08 09:09:15 -0500798 * Device ownership issues as mentioned above for swiotlb_map_page are the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 * same here.
800 */
801int
Arthur Kepner309df0c2008-04-29 01:00:32 -0700802swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900803 enum dma_data_direction dir, struct dma_attrs *attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804{
Jens Axboedbfd49f2007-05-11 14:56:18 +0200805 struct scatterlist *sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 int i;
807
Eric Sesterhenn34814542006-03-24 18:47:11 +0100808 BUG_ON(dir == DMA_NONE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
Jens Axboedbfd49f2007-05-11 14:56:18 +0200810 for_each_sg(sgl, sg, nelems, i) {
Ian Campbell961d7d02009-01-09 18:32:10 +0000811 phys_addr_t paddr = sg_phys(sg);
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900812 dma_addr_t dev_addr = phys_to_dma(hwdev, paddr);
Becky Brucebc40ac62008-12-22 10:26:08 -0800813
FUJITA Tomonoricf56e3f2009-07-10 10:04:52 +0900814 if (swiotlb_force ||
FUJITA Tomonorib9394642009-07-10 10:04:58 +0900815 !dma_capable(hwdev, dev_addr, sg->length)) {
Becky Brucebc40ac62008-12-22 10:26:08 -0800816 void *map = map_single(hwdev, sg_phys(sg),
817 sg->length, dir);
Andi Kleen7e870232005-12-20 14:45:19 +0100818 if (!map) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 /* Don't panic here, we expect map_sg users
820 to do proper error handling. */
821 swiotlb_full(hwdev, sg->length, dir, 0);
Arthur Kepner309df0c2008-04-29 01:00:32 -0700822 swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
823 attrs);
Jens Axboedbfd49f2007-05-11 14:56:18 +0200824 sgl[0].dma_length = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 return 0;
826 }
Jeremy Fitzhardinge70a7d3c2008-12-22 10:26:05 -0800827 sg->dma_address = swiotlb_virt_to_bus(hwdev, map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 } else
829 sg->dma_address = dev_addr;
830 sg->dma_length = sg->length;
831 }
832 return nelems;
833}
Arthur Kepner309df0c2008-04-29 01:00:32 -0700834EXPORT_SYMBOL(swiotlb_map_sg_attrs);
835
836int
837swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
Konrad Rzeszutek Wilk22d48262010-05-10 15:01:15 -0500838 enum dma_data_direction dir)
Arthur Kepner309df0c2008-04-29 01:00:32 -0700839{
840 return swiotlb_map_sg_attrs(hwdev, sgl, nelems, dir, NULL);
841}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900842EXPORT_SYMBOL(swiotlb_map_sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
844/*
845 * Unmap a set of streaming mode DMA translations. Again, cpu read rules
Becky Bruceceb5ac32009-04-08 09:09:15 -0500846 * concerning calls here are the same as for swiotlb_unmap_page() above.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 */
848void
Arthur Kepner309df0c2008-04-29 01:00:32 -0700849swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900850 int nelems, enum dma_data_direction dir, struct dma_attrs *attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851{
Jens Axboedbfd49f2007-05-11 14:56:18 +0200852 struct scatterlist *sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 int i;
854
Eric Sesterhenn34814542006-03-24 18:47:11 +0100855 BUG_ON(dir == DMA_NONE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500857 for_each_sg(sgl, sg, nelems, i)
858 unmap_single(hwdev, sg->dma_address, sg->dma_length, dir);
859
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860}
Arthur Kepner309df0c2008-04-29 01:00:32 -0700861EXPORT_SYMBOL(swiotlb_unmap_sg_attrs);
862
863void
864swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
Konrad Rzeszutek Wilk22d48262010-05-10 15:01:15 -0500865 enum dma_data_direction dir)
Arthur Kepner309df0c2008-04-29 01:00:32 -0700866{
867 return swiotlb_unmap_sg_attrs(hwdev, sgl, nelems, dir, NULL);
868}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900869EXPORT_SYMBOL(swiotlb_unmap_sg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
871/*
872 * Make physical memory consistent for a set of streaming mode DMA translations
873 * after a transfer.
874 *
875 * The same as swiotlb_sync_single_* but for a scatter-gather list, same rules
876 * and usage.
877 */
Andrew Mortonbe6b0262007-02-12 00:52:17 -0800878static void
Jens Axboedbfd49f2007-05-11 14:56:18 +0200879swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
Konrad Rzeszutek Wilkd7ef1532010-05-28 11:37:10 -0400880 int nelems, enum dma_data_direction dir,
881 enum dma_sync_target target)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882{
Jens Axboedbfd49f2007-05-11 14:56:18 +0200883 struct scatterlist *sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 int i;
885
Becky Bruce380d6872009-04-08 09:09:20 -0500886 for_each_sg(sgl, sg, nelems, i)
887 swiotlb_sync_single(hwdev, sg->dma_address,
John W. Linvillede69e0f2005-09-29 14:44:57 -0700888 sg->dma_length, dir, target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889}
890
891void
John W. Linville8270f3f2005-09-29 14:43:32 -0700892swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900893 int nelems, enum dma_data_direction dir)
John W. Linville8270f3f2005-09-29 14:43:32 -0700894{
John W. Linvillede69e0f2005-09-29 14:44:57 -0700895 swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU);
John W. Linville8270f3f2005-09-29 14:43:32 -0700896}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900897EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu);
John W. Linville8270f3f2005-09-29 14:43:32 -0700898
899void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900901 int nelems, enum dma_data_direction dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902{
John W. Linvillede69e0f2005-09-29 14:44:57 -0700903 swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900905EXPORT_SYMBOL(swiotlb_sync_sg_for_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
907int
FUJITA Tomonori8d8bb392008-07-25 19:44:49 -0700908swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909{
Jeremy Fitzhardinge70a7d3c2008-12-22 10:26:05 -0800910 return (dma_addr == swiotlb_virt_to_bus(hwdev, io_tlb_overflow_buffer));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900912EXPORT_SYMBOL(swiotlb_dma_mapping_error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913
914/*
Tony Luck17e5ad62005-09-29 15:52:13 -0700915 * Return whether the given device DMA address mask can be supported
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 * properly. For example, if your device can only drive the low 24-bits
Tony Luck17e5ad62005-09-29 15:52:13 -0700917 * during bus mastering, then you would pass 0x00ffffff as the mask to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 * this function.
919 */
920int
Jan Beulich563aaf02007-02-05 18:51:25 -0800921swiotlb_dma_supported(struct device *hwdev, u64 mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922{
Jeremy Fitzhardinge70a7d3c2008-12-22 10:26:05 -0800923 return swiotlb_virt_to_bus(hwdev, io_tlb_end - 1) <= mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925EXPORT_SYMBOL(swiotlb_dma_supported);