blob: c43ec227146982272c6c3a2c23762fafa2e45dd2 [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>
Christoph Hellwigea8c64a2018-01-10 16:21:13 +010021#include <linux/dma-direct.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/mm.h>
Paul Gortmaker8bc3bcc2011-11-16 21:29:17 -050023#include <linux/export.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>
Christoph Hellwig84be4562015-05-01 12:46:15 +020032#include <linux/scatterlist.h>
Tom Lendackyc7753202017-07-17 16:10:21 -050033#include <linux/mem_encrypt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
35#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <asm/dma.h>
37
38#include <linux/init.h>
39#include <linux/bootmem.h>
FUJITA Tomonoria8522502008-04-29 00:59:36 -070040#include <linux/iommu-helper.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Thierry Redingce5be5a2013-10-23 13:32:04 +020042#define CREATE_TRACE_POINTS
Zoltan Kiss2b2b6142013-09-04 21:11:05 +010043#include <trace/events/swiotlb.h>
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#define OFFSET(val,align) ((unsigned long) \
46 ( (val) & ( (align) - 1)))
47
Alex Williamson0b9afed2005-09-06 11:20:49 -060048#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT))
49
50/*
51 * Minimum IO TLB size to bother booting with. Systems with mainly
52 * 64bit capable cards will only lightly use the swiotlb. If we can't
53 * allocate a contiguous 1MB, we're probably in trouble anyway.
54 */
55#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
56
Geert Uytterhoevenae7871b2016-12-16 14:28:41 +010057enum swiotlb_force swiotlb_force;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59/*
Konrad Rzeszutek Wilkbfc55012010-05-10 15:54:20 -040060 * Used to do a quick range check in swiotlb_tbl_unmap_single and
61 * swiotlb_tbl_sync_single_*, to see if the memory was in fact allocated by this
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 * API.
63 */
Alexander Duyckff7204a2012-10-15 10:19:28 -070064static phys_addr_t io_tlb_start, io_tlb_end;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66/*
Uwe Kleine-Königb5950762010-11-01 15:38:34 -040067 * The number of IO TLB blocks (in groups of 64) between io_tlb_start and
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 * io_tlb_end. This is command line adjustable via setup_io_tlb_npages.
69 */
70static unsigned long io_tlb_nslabs;
71
72/*
73 * When the IOMMU overflows we return a fallback buffer. This sets the size.
74 */
75static unsigned long io_tlb_overflow = 32*1024;
76
Alexander Duyckee3f6ba2012-10-15 10:19:34 -070077static phys_addr_t io_tlb_overflow_buffer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79/*
80 * This is a free list describing the number of free entries available from
81 * each index
82 */
83static unsigned int *io_tlb_list;
84static unsigned int io_tlb_index;
85
86/*
Konrad Rzeszutek Wilk7453c542016-12-20 10:02:02 -050087 * Max segment that we can provide which (if pages are contingous) will
88 * not be bounced (unless SWIOTLB_FORCE is set).
89 */
90unsigned int max_segment;
91
92/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 * We need to save away the original address corresponding to a mapped entry
94 * for the sync operations.
95 */
Jan Beulich8e0629c2014-06-02 14:58:25 +010096#define INVALID_PHYS_ADDR (~(phys_addr_t)0)
Becky Brucebc40ac62008-12-22 10:26:08 -080097static phys_addr_t *io_tlb_orig_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99/*
100 * Protect the above data structures in the map and unmap calls
101 */
102static DEFINE_SPINLOCK(io_tlb_lock);
103
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900104static int late_alloc;
105
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106static int __init
107setup_io_tlb_npages(char *str)
108{
109 if (isdigit(*str)) {
Alex Williamsone8579e72005-08-04 13:06:00 -0700110 io_tlb_nslabs = simple_strtoul(str, &str, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 /* avoid tail segment of size < IO_TLB_SEGSIZE */
112 io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
113 }
114 if (*str == ',')
115 ++str;
Geert Uytterhoevenfff5d992016-12-16 14:28:42 +0100116 if (!strcmp(str, "force")) {
Geert Uytterhoevenae7871b2016-12-16 14:28:41 +0100117 swiotlb_force = SWIOTLB_FORCE;
Geert Uytterhoevenfff5d992016-12-16 14:28:42 +0100118 } else if (!strcmp(str, "noforce")) {
119 swiotlb_force = SWIOTLB_NO_FORCE;
120 io_tlb_nslabs = 1;
121 }
FUJITA Tomonorib18485e2009-11-12 00:03:28 +0900122
Yinghai Luc729de82013-04-15 22:23:45 -0700123 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124}
Yinghai Luc729de82013-04-15 22:23:45 -0700125early_param("swiotlb", setup_io_tlb_npages);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126/* make io_tlb_overflow tunable too? */
127
Konrad Rzeszutek Wilkf21ffe92011-08-11 16:50:56 -0400128unsigned long swiotlb_nr_tbl(void)
FUJITA Tomonori5f98ecd2011-06-05 11:47:29 +0900129{
130 return io_tlb_nslabs;
131}
Konrad Rzeszutek Wilkf21ffe92011-08-11 16:50:56 -0400132EXPORT_SYMBOL_GPL(swiotlb_nr_tbl);
Yinghai Luc729de82013-04-15 22:23:45 -0700133
Konrad Rzeszutek Wilk7453c542016-12-20 10:02:02 -0500134unsigned int swiotlb_max_segment(void)
135{
136 return max_segment;
137}
138EXPORT_SYMBOL_GPL(swiotlb_max_segment);
139
140void swiotlb_set_max_segment(unsigned int val)
141{
142 if (swiotlb_force == SWIOTLB_FORCE)
143 max_segment = 1;
144 else
145 max_segment = rounddown(val, PAGE_SIZE);
146}
147
Yinghai Luc729de82013-04-15 22:23:45 -0700148/* default to 64MB */
149#define IO_TLB_DEFAULT_SIZE (64UL<<20)
150unsigned long swiotlb_size_or_default(void)
151{
152 unsigned long size;
153
154 size = io_tlb_nslabs << IO_TLB_SHIFT;
155
156 return size ? size : (IO_TLB_DEFAULT_SIZE);
157}
158
Tom Lendackyc7753202017-07-17 16:10:21 -0500159void __weak swiotlb_set_mem_attributes(void *vaddr, unsigned long size) { }
160
161/* For swiotlb, clear memory encryption mask from dma addresses */
162static dma_addr_t swiotlb_phys_to_dma(struct device *hwdev,
163 phys_addr_t address)
164{
165 return __sme_clr(phys_to_dma(hwdev, address));
166}
167
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900168/* Note that this doesn't work with highmem page */
Jeremy Fitzhardinge70a7d3c2008-12-22 10:26:05 -0800169static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
170 volatile void *address)
Ian Campbelle08e1f72008-12-16 12:17:30 -0800171{
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900172 return phys_to_dma(hwdev, virt_to_phys(address));
Ian Campbelle08e1f72008-12-16 12:17:30 -0800173}
174
Yinghai Luac2cbab2013-01-24 12:20:16 -0800175static bool no_iotlb_memory;
176
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900177void swiotlb_print_info(void)
Ian Campbell2e5b2b82008-12-16 12:17:34 -0800178{
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900179 unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT;
Alexander Duyckff7204a2012-10-15 10:19:28 -0700180 unsigned char *vstart, *vend;
Ian Campbell2e5b2b82008-12-16 12:17:34 -0800181
Yinghai Luac2cbab2013-01-24 12:20:16 -0800182 if (no_iotlb_memory) {
183 pr_warn("software IO TLB: No low mem\n");
184 return;
185 }
186
Alexander Duyckff7204a2012-10-15 10:19:28 -0700187 vstart = phys_to_virt(io_tlb_start);
Alexander Duyckc40dba02012-10-15 10:19:22 -0700188 vend = phys_to_virt(io_tlb_end);
Ian Campbell2e5b2b82008-12-16 12:17:34 -0800189
Bjorn Helgaas3af684c2012-05-29 15:06:29 -0700190 printk(KERN_INFO "software IO TLB [mem %#010llx-%#010llx] (%luMB) mapped at [%p-%p]\n",
Alexander Duyckff7204a2012-10-15 10:19:28 -0700191 (unsigned long long)io_tlb_start,
Alexander Duyckc40dba02012-10-15 10:19:22 -0700192 (unsigned long long)io_tlb_end,
Alexander Duyckff7204a2012-10-15 10:19:28 -0700193 bytes >> 20, vstart, vend - 1);
Ian Campbell2e5b2b82008-12-16 12:17:34 -0800194}
195
Tom Lendackyc7753202017-07-17 16:10:21 -0500196/*
197 * Early SWIOTLB allocation may be too early to allow an architecture to
198 * perform the desired operations. This function allows the architecture to
199 * call SWIOTLB when the operations are possible. It needs to be called
200 * before the SWIOTLB memory is used.
201 */
202void __init swiotlb_update_mem_attributes(void)
203{
204 void *vaddr;
205 unsigned long bytes;
206
207 if (no_iotlb_memory || late_alloc)
208 return;
209
210 vaddr = phys_to_virt(io_tlb_start);
211 bytes = PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT);
212 swiotlb_set_mem_attributes(vaddr, bytes);
213 memset(vaddr, 0, bytes);
214
215 vaddr = phys_to_virt(io_tlb_overflow_buffer);
216 bytes = PAGE_ALIGN(io_tlb_overflow);
217 swiotlb_set_mem_attributes(vaddr, bytes);
218 memset(vaddr, 0, bytes);
219}
220
Yinghai Luac2cbab2013-01-24 12:20:16 -0800221int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
Alexander Duyckee3f6ba2012-10-15 10:19:34 -0700223 void *v_overflow_buffer;
Jan Beulich563aaf02007-02-05 18:51:25 -0800224 unsigned long i, bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
FUJITA Tomonoriabbceff2010-05-10 15:15:12 -0400226 bytes = nslabs << IO_TLB_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
FUJITA Tomonoriabbceff2010-05-10 15:15:12 -0400228 io_tlb_nslabs = nslabs;
Alexander Duyckff7204a2012-10-15 10:19:28 -0700229 io_tlb_start = __pa(tlb);
230 io_tlb_end = io_tlb_start + bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232 /*
Alexander Duyckee3f6ba2012-10-15 10:19:34 -0700233 * Get the overflow emergency buffer
234 */
Yinghai Luad6492b2014-01-27 17:06:49 -0800235 v_overflow_buffer = memblock_virt_alloc_low_nopanic(
Santosh Shilimkar457ff1d2014-01-21 15:50:30 -0800236 PAGE_ALIGN(io_tlb_overflow),
237 PAGE_SIZE);
Alexander Duyckee3f6ba2012-10-15 10:19:34 -0700238 if (!v_overflow_buffer)
Yinghai Luac2cbab2013-01-24 12:20:16 -0800239 return -ENOMEM;
Alexander Duyckee3f6ba2012-10-15 10:19:34 -0700240
241 io_tlb_overflow_buffer = __pa(v_overflow_buffer);
242
243 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 * Allocate and initialize the free list array. This array is used
245 * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
246 * between io_tlb_start and io_tlb_end.
247 */
Santosh Shilimkar457ff1d2014-01-21 15:50:30 -0800248 io_tlb_list = memblock_virt_alloc(
249 PAGE_ALIGN(io_tlb_nslabs * sizeof(int)),
250 PAGE_SIZE);
Santosh Shilimkar457ff1d2014-01-21 15:50:30 -0800251 io_tlb_orig_addr = memblock_virt_alloc(
252 PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)),
253 PAGE_SIZE);
Jan Beulich8e0629c2014-06-02 14:58:25 +0100254 for (i = 0; i < io_tlb_nslabs; i++) {
255 io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
256 io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
257 }
258 io_tlb_index = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900260 if (verbose)
261 swiotlb_print_info();
Yinghai Luac2cbab2013-01-24 12:20:16 -0800262
Konrad Rzeszutek Wilk7453c542016-12-20 10:02:02 -0500263 swiotlb_set_max_segment(io_tlb_nslabs << IO_TLB_SHIFT);
Yinghai Luac2cbab2013-01-24 12:20:16 -0800264 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265}
266
FUJITA Tomonoriabbceff2010-05-10 15:15:12 -0400267/*
268 * Statically reserve bounce buffer space and initialize bounce buffer data
269 * structures for the software IO TLB used to implement the DMA API.
270 */
Yinghai Luac2cbab2013-01-24 12:20:16 -0800271void __init
272swiotlb_init(int verbose)
FUJITA Tomonoriabbceff2010-05-10 15:15:12 -0400273{
Yinghai Luc729de82013-04-15 22:23:45 -0700274 size_t default_size = IO_TLB_DEFAULT_SIZE;
Alexander Duyckff7204a2012-10-15 10:19:28 -0700275 unsigned char *vstart;
FUJITA Tomonoriabbceff2010-05-10 15:15:12 -0400276 unsigned long bytes;
277
278 if (!io_tlb_nslabs) {
279 io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
280 io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
281 }
282
283 bytes = io_tlb_nslabs << IO_TLB_SHIFT;
284
Yinghai Luac2cbab2013-01-24 12:20:16 -0800285 /* Get IO TLB memory from the low pages */
Yinghai Luad6492b2014-01-27 17:06:49 -0800286 vstart = memblock_virt_alloc_low_nopanic(PAGE_ALIGN(bytes), PAGE_SIZE);
Yinghai Luac2cbab2013-01-24 12:20:16 -0800287 if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, verbose))
288 return;
FUJITA Tomonoriabbceff2010-05-10 15:15:12 -0400289
Yinghai Luac2cbab2013-01-24 12:20:16 -0800290 if (io_tlb_start)
Santosh Shilimkar457ff1d2014-01-21 15:50:30 -0800291 memblock_free_early(io_tlb_start,
292 PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
Yinghai Luac2cbab2013-01-24 12:20:16 -0800293 pr_warn("Cannot allocate SWIOTLB buffer");
294 no_iotlb_memory = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295}
296
Alex Williamson0b9afed2005-09-06 11:20:49 -0600297/*
298 * Systems with larger DMA zones (those that don't support ISA) can
299 * initialize the swiotlb later using the slab allocator if needed.
300 * This should be just like above, but with some error catching.
301 */
302int
Jan Beulich563aaf02007-02-05 18:51:25 -0800303swiotlb_late_init_with_default_size(size_t default_size)
Alex Williamson0b9afed2005-09-06 11:20:49 -0600304{
Konrad Rzeszutek Wilk74838b72012-07-27 20:55:27 -0400305 unsigned long bytes, req_nslabs = io_tlb_nslabs;
Alexander Duyckff7204a2012-10-15 10:19:28 -0700306 unsigned char *vstart = NULL;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600307 unsigned int order;
Konrad Rzeszutek Wilk74838b72012-07-27 20:55:27 -0400308 int rc = 0;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600309
310 if (!io_tlb_nslabs) {
311 io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
312 io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
313 }
314
315 /*
316 * Get IO TLB memory from the low pages
317 */
Jan Beulich563aaf02007-02-05 18:51:25 -0800318 order = get_order(io_tlb_nslabs << IO_TLB_SHIFT);
Alex Williamson0b9afed2005-09-06 11:20:49 -0600319 io_tlb_nslabs = SLABS_PER_PAGE << order;
Jan Beulich563aaf02007-02-05 18:51:25 -0800320 bytes = io_tlb_nslabs << IO_TLB_SHIFT;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600321
322 while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) {
Alexander Duyckff7204a2012-10-15 10:19:28 -0700323 vstart = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN,
324 order);
325 if (vstart)
Alex Williamson0b9afed2005-09-06 11:20:49 -0600326 break;
327 order--;
328 }
329
Alexander Duyckff7204a2012-10-15 10:19:28 -0700330 if (!vstart) {
Konrad Rzeszutek Wilk74838b72012-07-27 20:55:27 -0400331 io_tlb_nslabs = req_nslabs;
332 return -ENOMEM;
333 }
Jan Beulich563aaf02007-02-05 18:51:25 -0800334 if (order != get_order(bytes)) {
Alex Williamson0b9afed2005-09-06 11:20:49 -0600335 printk(KERN_WARNING "Warning: only able to allocate %ld MB "
336 "for software IO TLB\n", (PAGE_SIZE << order) >> 20);
337 io_tlb_nslabs = SLABS_PER_PAGE << order;
338 }
Alexander Duyckff7204a2012-10-15 10:19:28 -0700339 rc = swiotlb_late_init_with_tbl(vstart, io_tlb_nslabs);
Konrad Rzeszutek Wilk74838b72012-07-27 20:55:27 -0400340 if (rc)
Alexander Duyckff7204a2012-10-15 10:19:28 -0700341 free_pages((unsigned long)vstart, order);
Konrad Rzeszutek Wilk7453c542016-12-20 10:02:02 -0500342
Konrad Rzeszutek Wilk74838b72012-07-27 20:55:27 -0400343 return rc;
344}
345
346int
347swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
348{
349 unsigned long i, bytes;
Alexander Duyckee3f6ba2012-10-15 10:19:34 -0700350 unsigned char *v_overflow_buffer;
Konrad Rzeszutek Wilk74838b72012-07-27 20:55:27 -0400351
352 bytes = nslabs << IO_TLB_SHIFT;
353
354 io_tlb_nslabs = nslabs;
Alexander Duyckff7204a2012-10-15 10:19:28 -0700355 io_tlb_start = virt_to_phys(tlb);
356 io_tlb_end = io_tlb_start + bytes;
Konrad Rzeszutek Wilk74838b72012-07-27 20:55:27 -0400357
Tom Lendackyc7753202017-07-17 16:10:21 -0500358 swiotlb_set_mem_attributes(tlb, bytes);
Alexander Duyckff7204a2012-10-15 10:19:28 -0700359 memset(tlb, 0, bytes);
Alex Williamson0b9afed2005-09-06 11:20:49 -0600360
361 /*
Alexander Duyckee3f6ba2012-10-15 10:19:34 -0700362 * Get the overflow emergency buffer
363 */
364 v_overflow_buffer = (void *)__get_free_pages(GFP_DMA,
365 get_order(io_tlb_overflow));
366 if (!v_overflow_buffer)
367 goto cleanup2;
368
Tom Lendackyc7753202017-07-17 16:10:21 -0500369 swiotlb_set_mem_attributes(v_overflow_buffer, io_tlb_overflow);
370 memset(v_overflow_buffer, 0, io_tlb_overflow);
Alexander Duyckee3f6ba2012-10-15 10:19:34 -0700371 io_tlb_overflow_buffer = virt_to_phys(v_overflow_buffer);
372
373 /*
Alex Williamson0b9afed2005-09-06 11:20:49 -0600374 * Allocate and initialize the free list array. This array is used
375 * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
376 * between io_tlb_start and io_tlb_end.
377 */
378 io_tlb_list = (unsigned int *)__get_free_pages(GFP_KERNEL,
379 get_order(io_tlb_nslabs * sizeof(int)));
380 if (!io_tlb_list)
Alexander Duyckee3f6ba2012-10-15 10:19:34 -0700381 goto cleanup3;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600382
Becky Brucebc40ac62008-12-22 10:26:08 -0800383 io_tlb_orig_addr = (phys_addr_t *)
384 __get_free_pages(GFP_KERNEL,
385 get_order(io_tlb_nslabs *
386 sizeof(phys_addr_t)));
Alex Williamson0b9afed2005-09-06 11:20:49 -0600387 if (!io_tlb_orig_addr)
Alexander Duyckee3f6ba2012-10-15 10:19:34 -0700388 goto cleanup4;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600389
Jan Beulich8e0629c2014-06-02 14:58:25 +0100390 for (i = 0; i < io_tlb_nslabs; i++) {
391 io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
392 io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
393 }
394 io_tlb_index = 0;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600395
FUJITA Tomonoriad32e8c2009-11-10 19:46:19 +0900396 swiotlb_print_info();
Alex Williamson0b9afed2005-09-06 11:20:49 -0600397
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900398 late_alloc = 1;
399
Konrad Rzeszutek Wilk7453c542016-12-20 10:02:02 -0500400 swiotlb_set_max_segment(io_tlb_nslabs << IO_TLB_SHIFT);
401
Alex Williamson0b9afed2005-09-06 11:20:49 -0600402 return 0;
403
404cleanup4:
Tony Luck25667d62007-03-06 13:31:45 -0800405 free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
406 sizeof(int)));
Alex Williamson0b9afed2005-09-06 11:20:49 -0600407 io_tlb_list = NULL;
Alexander Duyckee3f6ba2012-10-15 10:19:34 -0700408cleanup3:
409 free_pages((unsigned long)v_overflow_buffer,
410 get_order(io_tlb_overflow));
411 io_tlb_overflow_buffer = 0;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600412cleanup2:
Alexander Duyckc40dba02012-10-15 10:19:22 -0700413 io_tlb_end = 0;
Alexander Duyckff7204a2012-10-15 10:19:28 -0700414 io_tlb_start = 0;
Konrad Rzeszutek Wilk74838b72012-07-27 20:55:27 -0400415 io_tlb_nslabs = 0;
Konrad Rzeszutek Wilk7453c542016-12-20 10:02:02 -0500416 max_segment = 0;
Alex Williamson0b9afed2005-09-06 11:20:49 -0600417 return -ENOMEM;
418}
419
Christoph Hellwig7f2c8bb2017-12-23 14:14:54 +0100420void __init swiotlb_exit(void)
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900421{
Alexander Duyckee3f6ba2012-10-15 10:19:34 -0700422 if (!io_tlb_orig_addr)
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900423 return;
424
425 if (late_alloc) {
Alexander Duyckee3f6ba2012-10-15 10:19:34 -0700426 free_pages((unsigned long)phys_to_virt(io_tlb_overflow_buffer),
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900427 get_order(io_tlb_overflow));
428 free_pages((unsigned long)io_tlb_orig_addr,
429 get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
430 free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
431 sizeof(int)));
Alexander Duyckff7204a2012-10-15 10:19:28 -0700432 free_pages((unsigned long)phys_to_virt(io_tlb_start),
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900433 get_order(io_tlb_nslabs << IO_TLB_SHIFT));
434 } else {
Santosh Shilimkar457ff1d2014-01-21 15:50:30 -0800435 memblock_free_late(io_tlb_overflow_buffer,
436 PAGE_ALIGN(io_tlb_overflow));
437 memblock_free_late(__pa(io_tlb_orig_addr),
438 PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
439 memblock_free_late(__pa(io_tlb_list),
440 PAGE_ALIGN(io_tlb_nslabs * sizeof(int)));
441 memblock_free_late(io_tlb_start,
442 PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900443 }
Konrad Rzeszutek Wilkf21ffe92011-08-11 16:50:56 -0400444 io_tlb_nslabs = 0;
Konrad Rzeszutek Wilk7453c542016-12-20 10:02:02 -0500445 max_segment = 0;
FUJITA Tomonori5740afd2009-11-10 19:46:18 +0900446}
447
Akinobu Mita9c5a3622014-06-04 16:06:50 -0700448int is_swiotlb_buffer(phys_addr_t paddr)
FUJITA Tomonori640aebf2008-09-08 18:53:50 +0900449{
Alexander Duyckff7204a2012-10-15 10:19:28 -0700450 return paddr >= io_tlb_start && paddr < io_tlb_end;
FUJITA Tomonori640aebf2008-09-08 18:53:50 +0900451}
452
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453/*
Becky Brucefb05a372008-12-22 10:26:09 -0800454 * Bounce: copy the swiotlb buffer back to the original dma location
455 */
Alexander Duyckaf51a9f2012-10-15 10:19:55 -0700456static void swiotlb_bounce(phys_addr_t orig_addr, phys_addr_t tlb_addr,
457 size_t size, enum dma_data_direction dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458{
Alexander Duyckaf51a9f2012-10-15 10:19:55 -0700459 unsigned long pfn = PFN_DOWN(orig_addr);
460 unsigned char *vaddr = phys_to_virt(tlb_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
Becky Brucefb05a372008-12-22 10:26:09 -0800462 if (PageHighMem(pfn_to_page(pfn))) {
463 /* The buffer does not have a mapping. Map it in and copy */
Alexander Duyckaf51a9f2012-10-15 10:19:55 -0700464 unsigned int offset = orig_addr & ~PAGE_MASK;
Becky Brucefb05a372008-12-22 10:26:09 -0800465 char *buffer;
466 unsigned int sz = 0;
467 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
Becky Brucefb05a372008-12-22 10:26:09 -0800469 while (size) {
Becky Bruce67131ad2009-04-08 09:09:16 -0500470 sz = min_t(size_t, PAGE_SIZE - offset, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
Becky Brucefb05a372008-12-22 10:26:09 -0800472 local_irq_save(flags);
Cong Wangc3eede82011-11-25 23:14:39 +0800473 buffer = kmap_atomic(pfn_to_page(pfn));
Becky Brucefb05a372008-12-22 10:26:09 -0800474 if (dir == DMA_TO_DEVICE)
Alexander Duyckaf51a9f2012-10-15 10:19:55 -0700475 memcpy(vaddr, buffer + offset, sz);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 else
Alexander Duyckaf51a9f2012-10-15 10:19:55 -0700477 memcpy(buffer + offset, vaddr, sz);
Cong Wangc3eede82011-11-25 23:14:39 +0800478 kunmap_atomic(buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 local_irq_restore(flags);
Becky Brucefb05a372008-12-22 10:26:09 -0800480
481 size -= sz;
482 pfn++;
Alexander Duyckaf51a9f2012-10-15 10:19:55 -0700483 vaddr += sz;
Becky Brucefb05a372008-12-22 10:26:09 -0800484 offset = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 }
Alexander Duyckaf51a9f2012-10-15 10:19:55 -0700486 } else if (dir == DMA_TO_DEVICE) {
487 memcpy(vaddr, phys_to_virt(orig_addr), size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 } else {
Alexander Duyckaf51a9f2012-10-15 10:19:55 -0700489 memcpy(phys_to_virt(orig_addr), vaddr, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 }
491}
492
Alexander Duycke05ed4d2012-10-15 10:19:39 -0700493phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
494 dma_addr_t tbl_dma_addr,
495 phys_addr_t orig_addr, size_t size,
Alexander Duyck0443fa02016-11-02 07:13:02 -0400496 enum dma_data_direction dir,
497 unsigned long attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498{
499 unsigned long flags;
Alexander Duycke05ed4d2012-10-15 10:19:39 -0700500 phys_addr_t tlb_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 unsigned int nslots, stride, index, wrap;
502 int i;
FUJITA Tomonori681cc5c2008-02-04 22:28:16 -0800503 unsigned long mask;
504 unsigned long offset_slots;
505 unsigned long max_slots;
506
Yinghai Luac2cbab2013-01-24 12:20:16 -0800507 if (no_iotlb_memory)
508 panic("Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer");
509
Tom Lendackyd7b417f2017-10-20 09:30:53 -0500510 if (mem_encrypt_active())
511 pr_warn_once("%s is active and system is using DMA bounce buffers\n",
512 sme_active() ? "SME" : "SEV");
Tom Lendacky648babb2017-07-17 16:10:22 -0500513
FUJITA Tomonori681cc5c2008-02-04 22:28:16 -0800514 mask = dma_get_seg_boundary(hwdev);
FUJITA Tomonori681cc5c2008-02-04 22:28:16 -0800515
FUJITA Tomonorieb605a52010-05-10 15:14:54 -0400516 tbl_dma_addr &= mask;
517
518 offset_slots = ALIGN(tbl_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
Ian Campbella5ddde4a2008-12-16 12:17:29 -0800519
520 /*
521 * Carefully handle integer overflow which can occur when mask == ~0UL.
522 */
Jan Beulichb15a38912008-03-13 09:13:30 +0000523 max_slots = mask + 1
524 ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT
525 : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
527 /*
Nikita Yushchenko602d9852017-01-11 21:56:31 +0300528 * For mappings greater than or equal to a page, we limit the stride
529 * (and hence alignment) to a page size.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 */
531 nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
Nikita Yushchenko602d9852017-01-11 21:56:31 +0300532 if (size >= PAGE_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT));
534 else
535 stride = 1;
536
Eric Sesterhenn34814542006-03-24 18:47:11 +0100537 BUG_ON(!nslots);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
539 /*
540 * Find suitable number of IO TLB entries size that will fit this
541 * request and allocate a buffer from that IO TLB pool.
542 */
543 spin_lock_irqsave(&io_tlb_lock, flags);
Andrew Mortona7133a12008-04-29 00:59:36 -0700544 index = ALIGN(io_tlb_index, stride);
545 if (index >= io_tlb_nslabs)
546 index = 0;
547 wrap = index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
Andrew Mortona7133a12008-04-29 00:59:36 -0700549 do {
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700550 while (iommu_is_span_boundary(index, nslots, offset_slots,
551 max_slots)) {
Jan Beulichb15a38912008-03-13 09:13:30 +0000552 index += stride;
553 if (index >= io_tlb_nslabs)
554 index = 0;
Andrew Mortona7133a12008-04-29 00:59:36 -0700555 if (index == wrap)
556 goto not_found;
557 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Andrew Mortona7133a12008-04-29 00:59:36 -0700559 /*
560 * If we find a slot that indicates we have 'nslots' number of
561 * contiguous buffers, we allocate the buffers from that slot
562 * and mark the entries as '0' indicating unavailable.
563 */
564 if (io_tlb_list[index] >= nslots) {
565 int count = 0;
566
567 for (i = index; i < (int) (index + nslots); i++)
568 io_tlb_list[i] = 0;
569 for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE - 1) && io_tlb_list[i]; i--)
570 io_tlb_list[i] = ++count;
Alexander Duycke05ed4d2012-10-15 10:19:39 -0700571 tlb_addr = io_tlb_start + (index << IO_TLB_SHIFT);
Andrew Mortona7133a12008-04-29 00:59:36 -0700572
573 /*
574 * Update the indices to avoid searching in the next
575 * round.
576 */
577 io_tlb_index = ((index + nslots) < io_tlb_nslabs
578 ? (index + nslots) : 0);
579
580 goto found;
581 }
582 index += stride;
583 if (index >= io_tlb_nslabs)
584 index = 0;
585 } while (index != wrap);
586
587not_found:
588 spin_unlock_irqrestore(&io_tlb_lock, flags);
Christian Königd0bc0c22018-01-04 14:24:19 +0100589 if (!(attrs & DMA_ATTR_NO_WARN) && printk_ratelimit())
Konrad Rzeszutek Wilk0cb637b2013-12-16 14:05:01 -0500590 dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes)\n", size);
Alexander Duycke05ed4d2012-10-15 10:19:39 -0700591 return SWIOTLB_MAP_ERROR;
Andrew Mortona7133a12008-04-29 00:59:36 -0700592found:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 spin_unlock_irqrestore(&io_tlb_lock, flags);
594
595 /*
596 * Save away the mapping from the original address to the DMA address.
597 * This is needed when we sync the memory. Then we sync the buffer if
598 * needed.
599 */
Becky Brucebc40ac62008-12-22 10:26:08 -0800600 for (i = 0; i < nslots; i++)
Alexander Duycke05ed4d2012-10-15 10:19:39 -0700601 io_tlb_orig_addr[index+i] = orig_addr + (i << IO_TLB_SHIFT);
Alexander Duyck0443fa02016-11-02 07:13:02 -0400602 if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
603 (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
Alexander Duyckaf51a9f2012-10-15 10:19:55 -0700604 swiotlb_bounce(orig_addr, tlb_addr, size, DMA_TO_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605
Alexander Duycke05ed4d2012-10-15 10:19:39 -0700606 return tlb_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607}
608
609/*
FUJITA Tomonorieb605a52010-05-10 15:14:54 -0400610 * Allocates bounce buffer and returns its kernel virtual address.
611 */
612
Alexandre Courbot023600f2015-05-26 18:02:54 +0900613static phys_addr_t
614map_single(struct device *hwdev, phys_addr_t phys, size_t size,
Alexander Duyck0443fa02016-11-02 07:13:02 -0400615 enum dma_data_direction dir, unsigned long attrs)
FUJITA Tomonorieb605a52010-05-10 15:14:54 -0400616{
Geert Uytterhoevenfff5d992016-12-16 14:28:42 +0100617 dma_addr_t start_dma_addr;
FUJITA Tomonorieb605a52010-05-10 15:14:54 -0400618
Geert Uytterhoevenfff5d992016-12-16 14:28:42 +0100619 if (swiotlb_force == SWIOTLB_NO_FORCE) {
620 dev_warn_ratelimited(hwdev, "Cannot do DMA to address %pa\n",
621 &phys);
622 return SWIOTLB_MAP_ERROR;
623 }
624
Tom Lendackyc7753202017-07-17 16:10:21 -0500625 start_dma_addr = swiotlb_phys_to_dma(hwdev, io_tlb_start);
Alexander Duyck0443fa02016-11-02 07:13:02 -0400626 return swiotlb_tbl_map_single(hwdev, start_dma_addr, phys, size,
627 dir, attrs);
FUJITA Tomonorieb605a52010-05-10 15:14:54 -0400628}
629
630/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 * dma_addr is the kernel virtual address of the bounce buffer to unmap.
632 */
Alexander Duyck61ca08c2012-10-15 10:19:44 -0700633void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
Alexander Duyck0443fa02016-11-02 07:13:02 -0400634 size_t size, enum dma_data_direction dir,
635 unsigned long attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636{
637 unsigned long flags;
638 int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
Alexander Duyck61ca08c2012-10-15 10:19:44 -0700639 int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
640 phys_addr_t orig_addr = io_tlb_orig_addr[index];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
642 /*
643 * First, sync the memory before unmapping the entry
644 */
Jan Beulich8e0629c2014-06-02 14:58:25 +0100645 if (orig_addr != INVALID_PHYS_ADDR &&
Alexander Duyck0443fa02016-11-02 07:13:02 -0400646 !(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
Jan Beulich8e0629c2014-06-02 14:58:25 +0100647 ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
Alexander Duyckaf51a9f2012-10-15 10:19:55 -0700648 swiotlb_bounce(orig_addr, tlb_addr, size, DMA_FROM_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
650 /*
651 * Return the buffer to the free list by setting the corresponding
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200652 * entries to indicate the number of contiguous entries available.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 * While returning the entries to the free list, we merge the entries
654 * with slots below and above the pool being returned.
655 */
656 spin_lock_irqsave(&io_tlb_lock, flags);
657 {
658 count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ?
659 io_tlb_list[index + nslots] : 0);
660 /*
661 * Step 1: return the slots to the free list, merging the
662 * slots with superceeding slots
663 */
Jan Beulich8e0629c2014-06-02 14:58:25 +0100664 for (i = index + nslots - 1; i >= index; i--) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 io_tlb_list[i] = ++count;
Jan Beulich8e0629c2014-06-02 14:58:25 +0100666 io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
667 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 /*
669 * Step 2: merge the returned slots with the preceding slots,
670 * if available (non zero)
671 */
672 for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--)
673 io_tlb_list[i] = ++count;
674 }
675 spin_unlock_irqrestore(&io_tlb_lock, flags);
676}
677
Alexander Duyckfbfda892012-10-15 10:19:49 -0700678void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
679 size_t size, enum dma_data_direction dir,
680 enum dma_sync_target target)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681{
Alexander Duyckfbfda892012-10-15 10:19:49 -0700682 int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
683 phys_addr_t orig_addr = io_tlb_orig_addr[index];
Becky Brucebc40ac62008-12-22 10:26:08 -0800684
Jan Beulich8e0629c2014-06-02 14:58:25 +0100685 if (orig_addr == INVALID_PHYS_ADDR)
686 return;
Alexander Duyckfbfda892012-10-15 10:19:49 -0700687 orig_addr += (unsigned long)tlb_addr & ((1 << IO_TLB_SHIFT) - 1);
Keir Fraserdf336d12007-07-21 04:37:24 -0700688
John W. Linvillede69e0f2005-09-29 14:44:57 -0700689 switch (target) {
690 case SYNC_FOR_CPU:
691 if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
Alexander Duyckaf51a9f2012-10-15 10:19:55 -0700692 swiotlb_bounce(orig_addr, tlb_addr,
Alexander Duyckfbfda892012-10-15 10:19:49 -0700693 size, DMA_FROM_DEVICE);
Eric Sesterhenn34814542006-03-24 18:47:11 +0100694 else
695 BUG_ON(dir != DMA_TO_DEVICE);
John W. Linvillede69e0f2005-09-29 14:44:57 -0700696 break;
697 case SYNC_FOR_DEVICE:
698 if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
Alexander Duyckaf51a9f2012-10-15 10:19:55 -0700699 swiotlb_bounce(orig_addr, tlb_addr,
Alexander Duyckfbfda892012-10-15 10:19:49 -0700700 size, DMA_TO_DEVICE);
Eric Sesterhenn34814542006-03-24 18:47:11 +0100701 else
702 BUG_ON(dir != DMA_FROM_DEVICE);
John W. Linvillede69e0f2005-09-29 14:44:57 -0700703 break;
704 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 BUG();
John W. Linvillede69e0f2005-09-29 14:44:57 -0700706 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707}
708
Christoph Hellwig0176adb2018-01-09 22:15:30 +0100709static inline bool dma_coherent_ok(struct device *dev, dma_addr_t addr,
710 size_t size)
711{
712 u64 mask = DMA_BIT_MASK(32);
713
714 if (dev && dev->coherent_dma_mask)
715 mask = dev->coherent_dma_mask;
716 return addr + size - 1 <= mask;
717}
718
719static void *
720swiotlb_alloc_buffer(struct device *dev, size_t size, dma_addr_t *dma_handle,
721 unsigned long attrs)
722{
723 phys_addr_t phys_addr;
724
725 if (swiotlb_force == SWIOTLB_NO_FORCE)
726 goto out_warn;
727
728 phys_addr = swiotlb_tbl_map_single(dev,
729 swiotlb_phys_to_dma(dev, io_tlb_start),
730 0, size, DMA_FROM_DEVICE, 0);
731 if (phys_addr == SWIOTLB_MAP_ERROR)
732 goto out_warn;
733
734 *dma_handle = swiotlb_phys_to_dma(dev, phys_addr);
735 if (dma_coherent_ok(dev, *dma_handle, size))
736 goto out_unmap;
737
738 memset(phys_to_virt(phys_addr), 0, size);
739 return phys_to_virt(phys_addr);
740
741out_unmap:
742 dev_warn(dev, "hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n",
743 (unsigned long long)(dev ? dev->coherent_dma_mask : 0),
744 (unsigned long long)*dma_handle);
745
746 /*
747 * DMA_TO_DEVICE to avoid memcpy in unmap_single.
748 * DMA_ATTR_SKIP_CPU_SYNC is optional.
749 */
750 swiotlb_tbl_unmap_single(dev, phys_addr, size, DMA_TO_DEVICE,
751 DMA_ATTR_SKIP_CPU_SYNC);
752out_warn:
753 if ((attrs & DMA_ATTR_NO_WARN) && printk_ratelimit()) {
754 dev_warn(dev,
755 "swiotlb: coherent allocation failed, size=%zu\n",
756 size);
757 dump_stack();
758 }
759 return NULL;
760}
761
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762void *
763swiotlb_alloc_coherent(struct device *hwdev, size_t size,
Al Viro06a54492005-10-21 03:21:03 -0400764 dma_addr_t *dma_handle, gfp_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 int order = get_order(size);
Christoph Hellwig0176adb2018-01-09 22:15:30 +0100767 unsigned long attrs = (flags & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0;
768 void *ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
Tony Luck25667d62007-03-06 13:31:45 -0800770 ret = (void *)__get_free_pages(flags, order);
Alexander Duycke05ed4d2012-10-15 10:19:39 -0700771 if (ret) {
Christoph Hellwig0176adb2018-01-09 22:15:30 +0100772 *dma_handle = swiotlb_virt_to_bus(hwdev, ret);
773 if (dma_coherent_ok(hwdev, *dma_handle, size)) {
774 memset(ret, 0, size);
775 return ret;
Alexander Duycke05ed4d2012-10-15 10:19:39 -0700776 }
Christoph Hellwig0176adb2018-01-09 22:15:30 +0100777 free_pages((unsigned long)ret, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 }
Alexander Duycke05ed4d2012-10-15 10:19:39 -0700779
Christoph Hellwig0176adb2018-01-09 22:15:30 +0100780 return swiotlb_alloc_buffer(hwdev, size, dma_handle, attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900782EXPORT_SYMBOL(swiotlb_alloc_coherent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
Christoph Hellwiga25381a2017-12-23 20:56:02 +0100784static bool swiotlb_free_buffer(struct device *dev, size_t size,
785 dma_addr_t dma_addr)
786{
787 phys_addr_t phys_addr = dma_to_phys(dev, dma_addr);
788
789 WARN_ON_ONCE(irqs_disabled());
790
791 if (!is_swiotlb_buffer(phys_addr))
792 return false;
793
794 /*
795 * DMA_TO_DEVICE to avoid memcpy in swiotlb_tbl_unmap_single.
796 * DMA_ATTR_SKIP_CPU_SYNC is optional.
797 */
798 swiotlb_tbl_unmap_single(dev, phys_addr, size, DMA_TO_DEVICE,
799 DMA_ATTR_SKIP_CPU_SYNC);
800 return true;
801}
802
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803void
804swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900805 dma_addr_t dev_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806{
Christoph Hellwiga25381a2017-12-23 20:56:02 +0100807 if (!swiotlb_free_buffer(hwdev, size, dev_addr))
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900808 free_pages((unsigned long)vaddr, get_order(size));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900810EXPORT_SYMBOL(swiotlb_free_coherent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
812static void
Konrad Rzeszutek Wilk22d48262010-05-10 15:01:15 -0500813swiotlb_full(struct device *dev, size_t size, enum dma_data_direction dir,
814 int do_panic)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815{
Geert Uytterhoevenfff5d992016-12-16 14:28:42 +0100816 if (swiotlb_force == SWIOTLB_NO_FORCE)
817 return;
818
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 /*
820 * Ran out of IOMMU space for this operation. This is very bad.
821 * Unfortunately the drivers cannot handle this operation properly.
Tony Luck17e5ad62005-09-29 15:52:13 -0700822 * unless they check for dma_mapping_error (most don't)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 * When the mapping is small enough return a static buffer to limit
824 * the damage, or panic when the transfer is too big.
825 */
Geert Uytterhoeven0d2e1892016-10-31 16:45:03 +0100826 dev_err_ratelimited(dev, "DMA: Out of SW-IOMMU space for %zu bytes\n",
827 size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828
Casey Dahlinc7084b32009-08-20 16:27:56 -0700829 if (size <= io_tlb_overflow || !do_panic)
830 return;
831
832 if (dir == DMA_BIDIRECTIONAL)
833 panic("DMA: Random memory could be DMA accessed\n");
834 if (dir == DMA_FROM_DEVICE)
835 panic("DMA: Random memory could be DMA written\n");
836 if (dir == DMA_TO_DEVICE)
837 panic("DMA: Random memory could be DMA read\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838}
839
840/*
841 * Map a single buffer of the indicated size for DMA in streaming mode. The
Tony Luck17e5ad62005-09-29 15:52:13 -0700842 * physical address to use is returned.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 *
844 * Once the device is given the dma address, the device owns this memory until
Becky Bruceceb5ac32009-04-08 09:09:15 -0500845 * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 */
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900847dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,
848 unsigned long offset, size_t size,
849 enum dma_data_direction dir,
Krzysztof Kozlowski00085f12016-08-03 13:46:00 -0700850 unsigned long attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851{
Alexander Duycke05ed4d2012-10-15 10:19:39 -0700852 phys_addr_t map, phys = page_to_phys(page) + offset;
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900853 dma_addr_t dev_addr = phys_to_dma(dev, phys);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
Eric Sesterhenn34814542006-03-24 18:47:11 +0100855 BUG_ON(dir == DMA_NONE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 /*
Becky Bruceceb5ac32009-04-08 09:09:15 -0500857 * If the address happens to be in the device's DMA window,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 * we can safely return the device addr and not worry about bounce
859 * buffering it.
860 */
Geert Uytterhoevenae7871b2016-12-16 14:28:41 +0100861 if (dma_capable(dev, dev_addr, size) && swiotlb_force != SWIOTLB_FORCE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 return dev_addr;
863
Zoltan Kiss2b2b6142013-09-04 21:11:05 +0100864 trace_swiotlb_bounced(dev, dev_addr, size, swiotlb_force);
865
Alexander Duycke05ed4d2012-10-15 10:19:39 -0700866 /* Oh well, have to allocate and map a bounce buffer. */
Alexander Duyck0443fa02016-11-02 07:13:02 -0400867 map = map_single(dev, phys, size, dir, attrs);
Alexander Duycke05ed4d2012-10-15 10:19:39 -0700868 if (map == SWIOTLB_MAP_ERROR) {
FUJITA Tomonorif98eee82009-01-05 23:59:03 +0900869 swiotlb_full(dev, size, dir, 1);
Tom Lendackyc7753202017-07-17 16:10:21 -0500870 return swiotlb_phys_to_dma(dev, io_tlb_overflow_buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 }
872
Tom Lendackyc7753202017-07-17 16:10:21 -0500873 dev_addr = swiotlb_phys_to_dma(dev, map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874
Alexander Duycke05ed4d2012-10-15 10:19:39 -0700875 /* Ensure that the address returned is DMA'ble */
Alexander Duyck0443fa02016-11-02 07:13:02 -0400876 if (dma_capable(dev, dev_addr, size))
877 return dev_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878
Alexander Duyckd29fa0c2016-11-10 07:05:31 -0500879 attrs |= DMA_ATTR_SKIP_CPU_SYNC;
880 swiotlb_tbl_unmap_single(dev, map, size, dir, attrs);
Alexander Duyck0443fa02016-11-02 07:13:02 -0400881
Tom Lendackyc7753202017-07-17 16:10:21 -0500882 return swiotlb_phys_to_dma(dev, io_tlb_overflow_buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883}
884
885/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 * Unmap a single streaming mode DMA translation. The dma_addr and size must
Becky Bruceceb5ac32009-04-08 09:09:15 -0500887 * match what was provided for in a previous swiotlb_map_page call. All
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 * other usages are undefined.
889 *
890 * After this call, reads by the cpu to the buffer are guaranteed to see
891 * whatever the device wrote there.
892 */
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500893static void unmap_single(struct device *hwdev, dma_addr_t dev_addr,
Alexander Duyck0443fa02016-11-02 07:13:02 -0400894 size_t size, enum dma_data_direction dir,
895 unsigned long attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896{
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900897 phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
Eric Sesterhenn34814542006-03-24 18:47:11 +0100899 BUG_ON(dir == DMA_NONE);
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500900
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900901 if (is_swiotlb_buffer(paddr)) {
Alexander Duyck0443fa02016-11-02 07:13:02 -0400902 swiotlb_tbl_unmap_single(hwdev, paddr, size, dir, attrs);
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500903 return;
904 }
905
906 if (dir != DMA_FROM_DEVICE)
907 return;
908
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900909 /*
910 * phys_to_virt doesn't work with hihgmem page but we could
911 * call dma_mark_clean() with hihgmem page here. However, we
912 * are fine since dma_mark_clean() is null on POWERPC. We can
913 * make dma_mark_clean() take a physical address if necessary.
914 */
915 dma_mark_clean(phys_to_virt(paddr), size);
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500916}
917
918void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
919 size_t size, enum dma_data_direction dir,
Krzysztof Kozlowski00085f12016-08-03 13:46:00 -0700920 unsigned long attrs)
Becky Bruce7fcebbd2009-04-08 09:09:19 -0500921{
Alexander Duyck0443fa02016-11-02 07:13:02 -0400922 unmap_single(hwdev, dev_addr, size, dir, attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923}
FUJITA Tomonori874d6a92008-12-28 15:02:07 +0900924
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925/*
926 * Make physical memory consistent for a single streaming mode DMA translation
927 * after a transfer.
928 *
Becky Bruceceb5ac32009-04-08 09:09:15 -0500929 * If you perform a swiotlb_map_page() but wish to interrogate the buffer
Tony Luck17e5ad62005-09-29 15:52:13 -0700930 * using the cpu, yet do not wish to teardown the dma mapping, you must
931 * call this function before doing so. At the next point you give the dma
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 * address back to the card, you must first perform a
933 * swiotlb_dma_sync_for_device, and then the device again owns the buffer
934 */
Andrew Mortonbe6b0262007-02-12 00:52:17 -0800935static void
John W. Linville8270f3f2005-09-29 14:43:32 -0700936swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
Konrad Rzeszutek Wilkd7ef1532010-05-28 11:37:10 -0400937 size_t size, enum dma_data_direction dir,
938 enum dma_sync_target target)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939{
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900940 phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
Eric Sesterhenn34814542006-03-24 18:47:11 +0100942 BUG_ON(dir == DMA_NONE);
Becky Bruce380d6872009-04-08 09:09:20 -0500943
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900944 if (is_swiotlb_buffer(paddr)) {
Alexander Duyckfbfda892012-10-15 10:19:49 -0700945 swiotlb_tbl_sync_single(hwdev, paddr, size, dir, target);
Becky Bruce380d6872009-04-08 09:09:20 -0500946 return;
947 }
948
949 if (dir != DMA_FROM_DEVICE)
950 return;
951
FUJITA Tomonori02ca6462009-07-23 11:18:49 +0900952 dma_mark_clean(phys_to_virt(paddr), size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953}
954
955void
John W. Linville8270f3f2005-09-29 14:43:32 -0700956swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900957 size_t size, enum dma_data_direction dir)
John W. Linville8270f3f2005-09-29 14:43:32 -0700958{
John W. Linvillede69e0f2005-09-29 14:44:57 -0700959 swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU);
John W. Linville8270f3f2005-09-29 14:43:32 -0700960}
961
962void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +0900964 size_t size, enum dma_data_direction dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965{
John W. Linvillede69e0f2005-09-29 14:44:57 -0700966 swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967}
968
969/*
970 * Map a set of buffers described by scatterlist in streaming mode for DMA.
Becky Bruceceb5ac32009-04-08 09:09:15 -0500971 * This is the scatter-gather version of the above swiotlb_map_page
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 * interface. Here the scatter gather list elements are each tagged with the
973 * appropriate dma address and length. They are obtained via
974 * sg_dma_{address,length}(SG).
975 *
976 * NOTE: An implementation may be able to use a smaller number of
977 * DMA address/length pairs than there are SG table elements.
978 * (for example via virtual mapping capabilities)
979 * The routine returns the number of addr/length pairs actually
980 * used, at most nents.
981 *
Becky Bruceceb5ac32009-04-08 09:09:15 -0500982 * Device ownership issues as mentioned above for swiotlb_map_page are the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 * same here.
984 */
985int
Arthur Kepner309df0c2008-04-29 01:00:32 -0700986swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
Krzysztof Kozlowski00085f12016-08-03 13:46:00 -0700987 enum dma_data_direction dir, unsigned long attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988{
Jens Axboedbfd49f2007-05-11 14:56:18 +0200989 struct scatterlist *sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 int i;
991
Eric Sesterhenn34814542006-03-24 18:47:11 +0100992 BUG_ON(dir == DMA_NONE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993
Jens Axboedbfd49f2007-05-11 14:56:18 +0200994 for_each_sg(sgl, sg, nelems, i) {
Ian Campbell961d7d02009-01-09 18:32:10 +0000995 phys_addr_t paddr = sg_phys(sg);
FUJITA Tomonori862d1962009-07-10 10:05:02 +0900996 dma_addr_t dev_addr = phys_to_dma(hwdev, paddr);
Becky Brucebc40ac62008-12-22 10:26:08 -0800997
Geert Uytterhoevenae7871b2016-12-16 14:28:41 +0100998 if (swiotlb_force == SWIOTLB_FORCE ||
FUJITA Tomonorib9394642009-07-10 10:04:58 +0900999 !dma_capable(hwdev, dev_addr, sg->length)) {
Alexander Duycke05ed4d2012-10-15 10:19:39 -07001000 phys_addr_t map = map_single(hwdev, sg_phys(sg),
Alexander Duyck0443fa02016-11-02 07:13:02 -04001001 sg->length, dir, attrs);
Alexander Duycke05ed4d2012-10-15 10:19:39 -07001002 if (map == SWIOTLB_MAP_ERROR) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 /* Don't panic here, we expect map_sg users
1004 to do proper error handling. */
1005 swiotlb_full(hwdev, sg->length, dir, 0);
Alexander Duyckd29fa0c2016-11-10 07:05:31 -05001006 attrs |= DMA_ATTR_SKIP_CPU_SYNC;
Arthur Kepner309df0c2008-04-29 01:00:32 -07001007 swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir,
1008 attrs);
EunBong Song4d86ec72013-08-05 17:30:47 +01001009 sg_dma_len(sgl) = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 return 0;
1011 }
Tom Lendackyc7753202017-07-17 16:10:21 -05001012 sg->dma_address = swiotlb_phys_to_dma(hwdev, map);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 } else
1014 sg->dma_address = dev_addr;
EunBong Song4d86ec72013-08-05 17:30:47 +01001015 sg_dma_len(sg) = sg->length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 }
1017 return nelems;
1018}
Arthur Kepner309df0c2008-04-29 01:00:32 -07001019
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020/*
1021 * Unmap a set of streaming mode DMA translations. Again, cpu read rules
Becky Bruceceb5ac32009-04-08 09:09:15 -05001022 * concerning calls here are the same as for swiotlb_unmap_page() above.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 */
1024void
Arthur Kepner309df0c2008-04-29 01:00:32 -07001025swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
Krzysztof Kozlowski00085f12016-08-03 13:46:00 -07001026 int nelems, enum dma_data_direction dir,
1027 unsigned long attrs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028{
Jens Axboedbfd49f2007-05-11 14:56:18 +02001029 struct scatterlist *sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 int i;
1031
Eric Sesterhenn34814542006-03-24 18:47:11 +01001032 BUG_ON(dir == DMA_NONE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
Becky Bruce7fcebbd2009-04-08 09:09:19 -05001034 for_each_sg(sgl, sg, nelems, i)
Alexander Duyck0443fa02016-11-02 07:13:02 -04001035 unmap_single(hwdev, sg->dma_address, sg_dma_len(sg), dir,
1036 attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037}
Arthur Kepner309df0c2008-04-29 01:00:32 -07001038
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039/*
1040 * Make physical memory consistent for a set of streaming mode DMA translations
1041 * after a transfer.
1042 *
1043 * The same as swiotlb_sync_single_* but for a scatter-gather list, same rules
1044 * and usage.
1045 */
Andrew Mortonbe6b0262007-02-12 00:52:17 -08001046static void
Jens Axboedbfd49f2007-05-11 14:56:18 +02001047swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
Konrad Rzeszutek Wilkd7ef1532010-05-28 11:37:10 -04001048 int nelems, enum dma_data_direction dir,
1049 enum dma_sync_target target)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050{
Jens Axboedbfd49f2007-05-11 14:56:18 +02001051 struct scatterlist *sg;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 int i;
1053
Becky Bruce380d6872009-04-08 09:09:20 -05001054 for_each_sg(sgl, sg, nelems, i)
1055 swiotlb_sync_single(hwdev, sg->dma_address,
EunBong Song4d86ec72013-08-05 17:30:47 +01001056 sg_dma_len(sg), dir, target);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057}
1058
1059void
John W. Linville8270f3f2005-09-29 14:43:32 -07001060swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +09001061 int nelems, enum dma_data_direction dir)
John W. Linville8270f3f2005-09-29 14:43:32 -07001062{
John W. Linvillede69e0f2005-09-29 14:44:57 -07001063 swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU);
John W. Linville8270f3f2005-09-29 14:43:32 -07001064}
1065
1066void
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
FUJITA Tomonori160c1d82009-01-05 23:59:02 +09001068 int nelems, enum dma_data_direction dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069{
John W. Linvillede69e0f2005-09-29 14:44:57 -07001070 swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071}
1072
1073int
FUJITA Tomonori8d8bb392008-07-25 19:44:49 -07001074swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075{
Tom Lendackyc7753202017-07-17 16:10:21 -05001076 return (dma_addr == swiotlb_phys_to_dma(hwdev, io_tlb_overflow_buffer));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077}
1078
1079/*
Tony Luck17e5ad62005-09-29 15:52:13 -07001080 * Return whether the given device DMA address mask can be supported
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 * properly. For example, if your device can only drive the low 24-bits
Tony Luck17e5ad62005-09-29 15:52:13 -07001082 * during bus mastering, then you would pass 0x00ffffff as the mask to
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 * this function.
1084 */
1085int
Jan Beulich563aaf02007-02-05 18:51:25 -08001086swiotlb_dma_supported(struct device *hwdev, u64 mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087{
Tom Lendackyc7753202017-07-17 16:10:21 -05001088 return swiotlb_phys_to_dma(hwdev, io_tlb_end - 1) <= mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089}
Christoph Hellwig251533e2018-01-09 16:44:16 +01001090
1091#ifdef CONFIG_DMA_DIRECT_OPS
1092void *swiotlb_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
1093 gfp_t gfp, unsigned long attrs)
1094{
1095 void *vaddr;
1096
Christoph Hellwig0176adb2018-01-09 22:15:30 +01001097 /* temporary workaround: */
1098 if (gfp & __GFP_NOWARN)
1099 attrs |= DMA_ATTR_NO_WARN;
1100
Christoph Hellwig251533e2018-01-09 16:44:16 +01001101 /*
1102 * Don't print a warning when the first allocation attempt fails.
1103 * swiotlb_alloc_coherent() will print a warning when the DMA memory
1104 * allocation ultimately failed.
1105 */
1106 gfp |= __GFP_NOWARN;
1107
1108 vaddr = dma_direct_alloc(dev, size, dma_handle, gfp, attrs);
1109 if (!vaddr)
Christoph Hellwig0176adb2018-01-09 22:15:30 +01001110 vaddr = swiotlb_alloc_buffer(dev, size, dma_handle, attrs);
Christoph Hellwig251533e2018-01-09 16:44:16 +01001111 return vaddr;
1112}
1113
1114void swiotlb_free(struct device *dev, size_t size, void *vaddr,
1115 dma_addr_t dma_addr, unsigned long attrs)
1116{
Christoph Hellwiga25381a2017-12-23 20:56:02 +01001117 if (!swiotlb_free_buffer(dev, size, dma_addr))
Christoph Hellwig251533e2018-01-09 16:44:16 +01001118 dma_direct_free(dev, size, vaddr, dma_addr, attrs);
1119}
1120
1121const struct dma_map_ops swiotlb_dma_ops = {
1122 .mapping_error = swiotlb_dma_mapping_error,
1123 .alloc = swiotlb_alloc,
1124 .free = swiotlb_free,
1125 .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
1126 .sync_single_for_device = swiotlb_sync_single_for_device,
1127 .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
1128 .sync_sg_for_device = swiotlb_sync_sg_for_device,
1129 .map_sg = swiotlb_map_sg_attrs,
1130 .unmap_sg = swiotlb_unmap_sg_attrs,
1131 .map_page = swiotlb_map_page,
1132 .unmap_page = swiotlb_unmap_page,
Christoph Hellwigaaf796d2017-12-24 15:07:34 +01001133 .dma_supported = swiotlb_dma_supported,
Christoph Hellwig251533e2018-01-09 16:44:16 +01001134};
1135#endif /* CONFIG_DMA_DIRECT_OPS */