Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Dynamic DMA mapping support. |
| 3 | * |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 4 | * This implementation is a fallback for platforms that do not support |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * I/O TLBs (aka DMA address translation hardware). |
| 6 | * Copyright (C) 2000 Asit Mallick <Asit.K.Mallick@intel.com> |
| 7 | * Copyright (C) 2000 Goutham Rao <goutham.rao@intel.com> |
| 8 | * Copyright (C) 2000, 2003 Hewlett-Packard Co |
| 9 | * David Mosberger-Tang <davidm@hpl.hp.com> |
| 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. Linville | 569c8bf | 2005-09-29 14:45:24 -0700 | [diff] [blame] | 14 | * 04/07/.. ak Better overflow handling. Assorted fixes. |
| 15 | * 05/09/10 linville Add support for syncing ranges, support syncing for |
| 16 | * DMA_BIDIRECTIONAL mappings, miscellaneous cleanup. |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 17 | * 08/12/11 beckyb Add highmem support |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | */ |
| 19 | |
| 20 | #include <linux/cache.h> |
Tony Luck | 17e5ad6 | 2005-09-29 15:52:13 -0700 | [diff] [blame] | 21 | #include <linux/dma-mapping.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/mm.h> |
Paul Gortmaker | 8bc3bcc | 2011-11-16 21:29:17 -0500 | [diff] [blame] | 23 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/spinlock.h> |
| 25 | #include <linux/string.h> |
Ian Campbell | 0016fde | 2008-12-16 12:17:27 -0800 | [diff] [blame] | 26 | #include <linux/swiotlb.h> |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 27 | #include <linux/pfn.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/types.h> |
| 29 | #include <linux/ctype.h> |
Jeremy Fitzhardinge | ef9b189 | 2008-12-16 12:17:33 -0800 | [diff] [blame] | 30 | #include <linux/highmem.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 31 | #include <linux/gfp.h> |
Christoph Hellwig | 84be456 | 2015-05-01 12:46:15 +0200 | [diff] [blame] | 32 | #include <linux/scatterlist.h> |
Tom Lendacky | c775320 | 2017-07-17 16:10:21 -0500 | [diff] [blame] | 33 | #include <linux/mem_encrypt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | #include <asm/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <asm/dma.h> |
| 37 | |
| 38 | #include <linux/init.h> |
| 39 | #include <linux/bootmem.h> |
FUJITA Tomonori | a852250 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 40 | #include <linux/iommu-helper.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Thierry Reding | ce5be5a | 2013-10-23 13:32:04 +0200 | [diff] [blame] | 42 | #define CREATE_TRACE_POINTS |
Zoltan Kiss | 2b2b614 | 2013-09-04 21:11:05 +0100 | [diff] [blame] | 43 | #include <trace/events/swiotlb.h> |
| 44 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #define OFFSET(val,align) ((unsigned long) \ |
| 46 | ( (val) & ( (align) - 1))) |
| 47 | |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 48 | #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 Uytterhoeven | ae7871b | 2016-12-16 14:28:41 +0100 | [diff] [blame] | 57 | enum swiotlb_force swiotlb_force; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
| 59 | /* |
Konrad Rzeszutek Wilk | bfc5501 | 2010-05-10 15:54:20 -0400 | [diff] [blame] | 60 | * 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | * API. |
| 63 | */ |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 64 | static phys_addr_t io_tlb_start, io_tlb_end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
| 66 | /* |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 67 | * The number of IO TLB blocks (in groups of 64) between io_tlb_start and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | * io_tlb_end. This is command line adjustable via setup_io_tlb_npages. |
| 69 | */ |
| 70 | static unsigned long io_tlb_nslabs; |
| 71 | |
| 72 | /* |
| 73 | * When the IOMMU overflows we return a fallback buffer. This sets the size. |
| 74 | */ |
| 75 | static unsigned long io_tlb_overflow = 32*1024; |
| 76 | |
Alexander Duyck | ee3f6ba | 2012-10-15 10:19:34 -0700 | [diff] [blame] | 77 | static phys_addr_t io_tlb_overflow_buffer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | /* |
| 80 | * This is a free list describing the number of free entries available from |
| 81 | * each index |
| 82 | */ |
| 83 | static unsigned int *io_tlb_list; |
| 84 | static unsigned int io_tlb_index; |
| 85 | |
| 86 | /* |
Konrad Rzeszutek Wilk | 7453c549 | 2016-12-20 10:02:02 -0500 | [diff] [blame] | 87 | * Max segment that we can provide which (if pages are contingous) will |
| 88 | * not be bounced (unless SWIOTLB_FORCE is set). |
| 89 | */ |
| 90 | unsigned int max_segment; |
| 91 | |
| 92 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | * We need to save away the original address corresponding to a mapped entry |
| 94 | * for the sync operations. |
| 95 | */ |
Jan Beulich | 8e0629c | 2014-06-02 14:58:25 +0100 | [diff] [blame] | 96 | #define INVALID_PHYS_ADDR (~(phys_addr_t)0) |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 97 | static phys_addr_t *io_tlb_orig_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
| 99 | /* |
| 100 | * Protect the above data structures in the map and unmap calls |
| 101 | */ |
| 102 | static DEFINE_SPINLOCK(io_tlb_lock); |
| 103 | |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 104 | static int late_alloc; |
| 105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | static int __init |
| 107 | setup_io_tlb_npages(char *str) |
| 108 | { |
| 109 | if (isdigit(*str)) { |
Alex Williamson | e8579e7 | 2005-08-04 13:06:00 -0700 | [diff] [blame] | 110 | io_tlb_nslabs = simple_strtoul(str, &str, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | /* 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 Uytterhoeven | fff5d99 | 2016-12-16 14:28:42 +0100 | [diff] [blame] | 116 | if (!strcmp(str, "force")) { |
Geert Uytterhoeven | ae7871b | 2016-12-16 14:28:41 +0100 | [diff] [blame] | 117 | swiotlb_force = SWIOTLB_FORCE; |
Geert Uytterhoeven | fff5d99 | 2016-12-16 14:28:42 +0100 | [diff] [blame] | 118 | } else if (!strcmp(str, "noforce")) { |
| 119 | swiotlb_force = SWIOTLB_NO_FORCE; |
| 120 | io_tlb_nslabs = 1; |
| 121 | } |
FUJITA Tomonori | b18485e | 2009-11-12 00:03:28 +0900 | [diff] [blame] | 122 | |
Yinghai Lu | c729de8 | 2013-04-15 22:23:45 -0700 | [diff] [blame] | 123 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | } |
Yinghai Lu | c729de8 | 2013-04-15 22:23:45 -0700 | [diff] [blame] | 125 | early_param("swiotlb", setup_io_tlb_npages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | /* make io_tlb_overflow tunable too? */ |
| 127 | |
Konrad Rzeszutek Wilk | f21ffe9 | 2011-08-11 16:50:56 -0400 | [diff] [blame] | 128 | unsigned long swiotlb_nr_tbl(void) |
FUJITA Tomonori | 5f98ecd | 2011-06-05 11:47:29 +0900 | [diff] [blame] | 129 | { |
| 130 | return io_tlb_nslabs; |
| 131 | } |
Konrad Rzeszutek Wilk | f21ffe9 | 2011-08-11 16:50:56 -0400 | [diff] [blame] | 132 | EXPORT_SYMBOL_GPL(swiotlb_nr_tbl); |
Yinghai Lu | c729de8 | 2013-04-15 22:23:45 -0700 | [diff] [blame] | 133 | |
Konrad Rzeszutek Wilk | 7453c549 | 2016-12-20 10:02:02 -0500 | [diff] [blame] | 134 | unsigned int swiotlb_max_segment(void) |
| 135 | { |
| 136 | return max_segment; |
| 137 | } |
| 138 | EXPORT_SYMBOL_GPL(swiotlb_max_segment); |
| 139 | |
| 140 | void 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 Lu | c729de8 | 2013-04-15 22:23:45 -0700 | [diff] [blame] | 148 | /* default to 64MB */ |
| 149 | #define IO_TLB_DEFAULT_SIZE (64UL<<20) |
| 150 | unsigned 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 Lendacky | c775320 | 2017-07-17 16:10:21 -0500 | [diff] [blame] | 159 | void __weak swiotlb_set_mem_attributes(void *vaddr, unsigned long size) { } |
| 160 | |
| 161 | /* For swiotlb, clear memory encryption mask from dma addresses */ |
| 162 | static 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 Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 168 | /* Note that this doesn't work with highmem page */ |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 169 | static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev, |
| 170 | volatile void *address) |
Ian Campbell | e08e1f7 | 2008-12-16 12:17:30 -0800 | [diff] [blame] | 171 | { |
FUJITA Tomonori | 862d196 | 2009-07-10 10:05:02 +0900 | [diff] [blame] | 172 | return phys_to_dma(hwdev, virt_to_phys(address)); |
Ian Campbell | e08e1f7 | 2008-12-16 12:17:30 -0800 | [diff] [blame] | 173 | } |
| 174 | |
Yinghai Lu | ac2cbab | 2013-01-24 12:20:16 -0800 | [diff] [blame] | 175 | static bool no_iotlb_memory; |
| 176 | |
FUJITA Tomonori | ad32e8c | 2009-11-10 19:46:19 +0900 | [diff] [blame] | 177 | void swiotlb_print_info(void) |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 178 | { |
FUJITA Tomonori | ad32e8c | 2009-11-10 19:46:19 +0900 | [diff] [blame] | 179 | unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT; |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 180 | unsigned char *vstart, *vend; |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 181 | |
Yinghai Lu | ac2cbab | 2013-01-24 12:20:16 -0800 | [diff] [blame] | 182 | if (no_iotlb_memory) { |
| 183 | pr_warn("software IO TLB: No low mem\n"); |
| 184 | return; |
| 185 | } |
| 186 | |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 187 | vstart = phys_to_virt(io_tlb_start); |
Alexander Duyck | c40dba0 | 2012-10-15 10:19:22 -0700 | [diff] [blame] | 188 | vend = phys_to_virt(io_tlb_end); |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 189 | |
Bjorn Helgaas | 3af684c | 2012-05-29 15:06:29 -0700 | [diff] [blame] | 190 | printk(KERN_INFO "software IO TLB [mem %#010llx-%#010llx] (%luMB) mapped at [%p-%p]\n", |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 191 | (unsigned long long)io_tlb_start, |
Alexander Duyck | c40dba0 | 2012-10-15 10:19:22 -0700 | [diff] [blame] | 192 | (unsigned long long)io_tlb_end, |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 193 | bytes >> 20, vstart, vend - 1); |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 194 | } |
| 195 | |
Tom Lendacky | c775320 | 2017-07-17 16:10:21 -0500 | [diff] [blame] | 196 | /* |
| 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 | */ |
| 202 | void __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 Lu | ac2cbab | 2013-01-24 12:20:16 -0800 | [diff] [blame] | 221 | int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | { |
Alexander Duyck | ee3f6ba | 2012-10-15 10:19:34 -0700 | [diff] [blame] | 223 | void *v_overflow_buffer; |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 224 | unsigned long i, bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | |
FUJITA Tomonori | abbceff | 2010-05-10 15:15:12 -0400 | [diff] [blame] | 226 | bytes = nslabs << IO_TLB_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
FUJITA Tomonori | abbceff | 2010-05-10 15:15:12 -0400 | [diff] [blame] | 228 | io_tlb_nslabs = nslabs; |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 229 | io_tlb_start = __pa(tlb); |
| 230 | io_tlb_end = io_tlb_start + bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
| 232 | /* |
Alexander Duyck | ee3f6ba | 2012-10-15 10:19:34 -0700 | [diff] [blame] | 233 | * Get the overflow emergency buffer |
| 234 | */ |
Yinghai Lu | ad6492b | 2014-01-27 17:06:49 -0800 | [diff] [blame] | 235 | v_overflow_buffer = memblock_virt_alloc_low_nopanic( |
Santosh Shilimkar | 457ff1d | 2014-01-21 15:50:30 -0800 | [diff] [blame] | 236 | PAGE_ALIGN(io_tlb_overflow), |
| 237 | PAGE_SIZE); |
Alexander Duyck | ee3f6ba | 2012-10-15 10:19:34 -0700 | [diff] [blame] | 238 | if (!v_overflow_buffer) |
Yinghai Lu | ac2cbab | 2013-01-24 12:20:16 -0800 | [diff] [blame] | 239 | return -ENOMEM; |
Alexander Duyck | ee3f6ba | 2012-10-15 10:19:34 -0700 | [diff] [blame] | 240 | |
| 241 | io_tlb_overflow_buffer = __pa(v_overflow_buffer); |
| 242 | |
| 243 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | * 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 Shilimkar | 457ff1d | 2014-01-21 15:50:30 -0800 | [diff] [blame] | 248 | io_tlb_list = memblock_virt_alloc( |
| 249 | PAGE_ALIGN(io_tlb_nslabs * sizeof(int)), |
| 250 | PAGE_SIZE); |
Santosh Shilimkar | 457ff1d | 2014-01-21 15:50:30 -0800 | [diff] [blame] | 251 | io_tlb_orig_addr = memblock_virt_alloc( |
| 252 | PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)), |
| 253 | PAGE_SIZE); |
Jan Beulich | 8e0629c | 2014-06-02 14:58:25 +0100 | [diff] [blame] | 254 | 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
FUJITA Tomonori | ad32e8c | 2009-11-10 19:46:19 +0900 | [diff] [blame] | 260 | if (verbose) |
| 261 | swiotlb_print_info(); |
Yinghai Lu | ac2cbab | 2013-01-24 12:20:16 -0800 | [diff] [blame] | 262 | |
Konrad Rzeszutek Wilk | 7453c549 | 2016-12-20 10:02:02 -0500 | [diff] [blame] | 263 | swiotlb_set_max_segment(io_tlb_nslabs << IO_TLB_SHIFT); |
Yinghai Lu | ac2cbab | 2013-01-24 12:20:16 -0800 | [diff] [blame] | 264 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
| 266 | |
FUJITA Tomonori | abbceff | 2010-05-10 15:15:12 -0400 | [diff] [blame] | 267 | /* |
| 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 Lu | ac2cbab | 2013-01-24 12:20:16 -0800 | [diff] [blame] | 271 | void __init |
| 272 | swiotlb_init(int verbose) |
FUJITA Tomonori | abbceff | 2010-05-10 15:15:12 -0400 | [diff] [blame] | 273 | { |
Yinghai Lu | c729de8 | 2013-04-15 22:23:45 -0700 | [diff] [blame] | 274 | size_t default_size = IO_TLB_DEFAULT_SIZE; |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 275 | unsigned char *vstart; |
FUJITA Tomonori | abbceff | 2010-05-10 15:15:12 -0400 | [diff] [blame] | 276 | 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 Lu | ac2cbab | 2013-01-24 12:20:16 -0800 | [diff] [blame] | 285 | /* Get IO TLB memory from the low pages */ |
Yinghai Lu | ad6492b | 2014-01-27 17:06:49 -0800 | [diff] [blame] | 286 | vstart = memblock_virt_alloc_low_nopanic(PAGE_ALIGN(bytes), PAGE_SIZE); |
Yinghai Lu | ac2cbab | 2013-01-24 12:20:16 -0800 | [diff] [blame] | 287 | if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, verbose)) |
| 288 | return; |
FUJITA Tomonori | abbceff | 2010-05-10 15:15:12 -0400 | [diff] [blame] | 289 | |
Yinghai Lu | ac2cbab | 2013-01-24 12:20:16 -0800 | [diff] [blame] | 290 | if (io_tlb_start) |
Santosh Shilimkar | 457ff1d | 2014-01-21 15:50:30 -0800 | [diff] [blame] | 291 | memblock_free_early(io_tlb_start, |
| 292 | PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT)); |
Yinghai Lu | ac2cbab | 2013-01-24 12:20:16 -0800 | [diff] [blame] | 293 | pr_warn("Cannot allocate SWIOTLB buffer"); |
| 294 | no_iotlb_memory = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | } |
| 296 | |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 297 | /* |
| 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 | */ |
| 302 | int |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 303 | swiotlb_late_init_with_default_size(size_t default_size) |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 304 | { |
Konrad Rzeszutek Wilk | 74838b7 | 2012-07-27 20:55:27 -0400 | [diff] [blame] | 305 | unsigned long bytes, req_nslabs = io_tlb_nslabs; |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 306 | unsigned char *vstart = NULL; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 307 | unsigned int order; |
Konrad Rzeszutek Wilk | 74838b7 | 2012-07-27 20:55:27 -0400 | [diff] [blame] | 308 | int rc = 0; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 309 | |
| 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 Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 318 | order = get_order(io_tlb_nslabs << IO_TLB_SHIFT); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 319 | io_tlb_nslabs = SLABS_PER_PAGE << order; |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 320 | bytes = io_tlb_nslabs << IO_TLB_SHIFT; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 321 | |
| 322 | while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) { |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 323 | vstart = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, |
| 324 | order); |
| 325 | if (vstart) |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 326 | break; |
| 327 | order--; |
| 328 | } |
| 329 | |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 330 | if (!vstart) { |
Konrad Rzeszutek Wilk | 74838b7 | 2012-07-27 20:55:27 -0400 | [diff] [blame] | 331 | io_tlb_nslabs = req_nslabs; |
| 332 | return -ENOMEM; |
| 333 | } |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 334 | if (order != get_order(bytes)) { |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 335 | 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 Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 339 | rc = swiotlb_late_init_with_tbl(vstart, io_tlb_nslabs); |
Konrad Rzeszutek Wilk | 74838b7 | 2012-07-27 20:55:27 -0400 | [diff] [blame] | 340 | if (rc) |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 341 | free_pages((unsigned long)vstart, order); |
Konrad Rzeszutek Wilk | 7453c549 | 2016-12-20 10:02:02 -0500 | [diff] [blame] | 342 | |
Konrad Rzeszutek Wilk | 74838b7 | 2012-07-27 20:55:27 -0400 | [diff] [blame] | 343 | return rc; |
| 344 | } |
| 345 | |
| 346 | int |
| 347 | swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs) |
| 348 | { |
| 349 | unsigned long i, bytes; |
Alexander Duyck | ee3f6ba | 2012-10-15 10:19:34 -0700 | [diff] [blame] | 350 | unsigned char *v_overflow_buffer; |
Konrad Rzeszutek Wilk | 74838b7 | 2012-07-27 20:55:27 -0400 | [diff] [blame] | 351 | |
| 352 | bytes = nslabs << IO_TLB_SHIFT; |
| 353 | |
| 354 | io_tlb_nslabs = nslabs; |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 355 | io_tlb_start = virt_to_phys(tlb); |
| 356 | io_tlb_end = io_tlb_start + bytes; |
Konrad Rzeszutek Wilk | 74838b7 | 2012-07-27 20:55:27 -0400 | [diff] [blame] | 357 | |
Tom Lendacky | c775320 | 2017-07-17 16:10:21 -0500 | [diff] [blame] | 358 | swiotlb_set_mem_attributes(tlb, bytes); |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 359 | memset(tlb, 0, bytes); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 360 | |
| 361 | /* |
Alexander Duyck | ee3f6ba | 2012-10-15 10:19:34 -0700 | [diff] [blame] | 362 | * 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 Lendacky | c775320 | 2017-07-17 16:10:21 -0500 | [diff] [blame] | 369 | swiotlb_set_mem_attributes(v_overflow_buffer, io_tlb_overflow); |
| 370 | memset(v_overflow_buffer, 0, io_tlb_overflow); |
Alexander Duyck | ee3f6ba | 2012-10-15 10:19:34 -0700 | [diff] [blame] | 371 | io_tlb_overflow_buffer = virt_to_phys(v_overflow_buffer); |
| 372 | |
| 373 | /* |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 374 | * 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 Duyck | ee3f6ba | 2012-10-15 10:19:34 -0700 | [diff] [blame] | 381 | goto cleanup3; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 382 | |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 383 | 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 Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 387 | if (!io_tlb_orig_addr) |
Alexander Duyck | ee3f6ba | 2012-10-15 10:19:34 -0700 | [diff] [blame] | 388 | goto cleanup4; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 389 | |
Jan Beulich | 8e0629c | 2014-06-02 14:58:25 +0100 | [diff] [blame] | 390 | 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 Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 395 | |
FUJITA Tomonori | ad32e8c | 2009-11-10 19:46:19 +0900 | [diff] [blame] | 396 | swiotlb_print_info(); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 397 | |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 398 | late_alloc = 1; |
| 399 | |
Konrad Rzeszutek Wilk | 7453c549 | 2016-12-20 10:02:02 -0500 | [diff] [blame] | 400 | swiotlb_set_max_segment(io_tlb_nslabs << IO_TLB_SHIFT); |
| 401 | |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 402 | return 0; |
| 403 | |
| 404 | cleanup4: |
Tony Luck | 25667d6 | 2007-03-06 13:31:45 -0800 | [diff] [blame] | 405 | free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs * |
| 406 | sizeof(int))); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 407 | io_tlb_list = NULL; |
Alexander Duyck | ee3f6ba | 2012-10-15 10:19:34 -0700 | [diff] [blame] | 408 | cleanup3: |
| 409 | free_pages((unsigned long)v_overflow_buffer, |
| 410 | get_order(io_tlb_overflow)); |
| 411 | io_tlb_overflow_buffer = 0; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 412 | cleanup2: |
Alexander Duyck | c40dba0 | 2012-10-15 10:19:22 -0700 | [diff] [blame] | 413 | io_tlb_end = 0; |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 414 | io_tlb_start = 0; |
Konrad Rzeszutek Wilk | 74838b7 | 2012-07-27 20:55:27 -0400 | [diff] [blame] | 415 | io_tlb_nslabs = 0; |
Konrad Rzeszutek Wilk | 7453c549 | 2016-12-20 10:02:02 -0500 | [diff] [blame] | 416 | max_segment = 0; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 417 | return -ENOMEM; |
| 418 | } |
| 419 | |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 420 | void __init swiotlb_free(void) |
| 421 | { |
Alexander Duyck | ee3f6ba | 2012-10-15 10:19:34 -0700 | [diff] [blame] | 422 | if (!io_tlb_orig_addr) |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 423 | return; |
| 424 | |
| 425 | if (late_alloc) { |
Alexander Duyck | ee3f6ba | 2012-10-15 10:19:34 -0700 | [diff] [blame] | 426 | free_pages((unsigned long)phys_to_virt(io_tlb_overflow_buffer), |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 427 | 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 Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 432 | free_pages((unsigned long)phys_to_virt(io_tlb_start), |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 433 | get_order(io_tlb_nslabs << IO_TLB_SHIFT)); |
| 434 | } else { |
Santosh Shilimkar | 457ff1d | 2014-01-21 15:50:30 -0800 | [diff] [blame] | 435 | 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 Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 443 | } |
Konrad Rzeszutek Wilk | f21ffe9 | 2011-08-11 16:50:56 -0400 | [diff] [blame] | 444 | io_tlb_nslabs = 0; |
Konrad Rzeszutek Wilk | 7453c549 | 2016-12-20 10:02:02 -0500 | [diff] [blame] | 445 | max_segment = 0; |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 446 | } |
| 447 | |
Akinobu Mita | 9c5a362 | 2014-06-04 16:06:50 -0700 | [diff] [blame] | 448 | int is_swiotlb_buffer(phys_addr_t paddr) |
FUJITA Tomonori | 640aebf | 2008-09-08 18:53:50 +0900 | [diff] [blame] | 449 | { |
Alexander Duyck | ff7204a | 2012-10-15 10:19:28 -0700 | [diff] [blame] | 450 | return paddr >= io_tlb_start && paddr < io_tlb_end; |
FUJITA Tomonori | 640aebf | 2008-09-08 18:53:50 +0900 | [diff] [blame] | 451 | } |
| 452 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | /* |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 454 | * Bounce: copy the swiotlb buffer back to the original dma location |
| 455 | */ |
Alexander Duyck | af51a9f | 2012-10-15 10:19:55 -0700 | [diff] [blame] | 456 | static void swiotlb_bounce(phys_addr_t orig_addr, phys_addr_t tlb_addr, |
| 457 | size_t size, enum dma_data_direction dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | { |
Alexander Duyck | af51a9f | 2012-10-15 10:19:55 -0700 | [diff] [blame] | 459 | unsigned long pfn = PFN_DOWN(orig_addr); |
| 460 | unsigned char *vaddr = phys_to_virt(tlb_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 462 | if (PageHighMem(pfn_to_page(pfn))) { |
| 463 | /* The buffer does not have a mapping. Map it in and copy */ |
Alexander Duyck | af51a9f | 2012-10-15 10:19:55 -0700 | [diff] [blame] | 464 | unsigned int offset = orig_addr & ~PAGE_MASK; |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 465 | char *buffer; |
| 466 | unsigned int sz = 0; |
| 467 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 469 | while (size) { |
Becky Bruce | 67131ad | 2009-04-08 09:09:16 -0500 | [diff] [blame] | 470 | sz = min_t(size_t, PAGE_SIZE - offset, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 472 | local_irq_save(flags); |
Cong Wang | c3eede8 | 2011-11-25 23:14:39 +0800 | [diff] [blame] | 473 | buffer = kmap_atomic(pfn_to_page(pfn)); |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 474 | if (dir == DMA_TO_DEVICE) |
Alexander Duyck | af51a9f | 2012-10-15 10:19:55 -0700 | [diff] [blame] | 475 | memcpy(vaddr, buffer + offset, sz); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | else |
Alexander Duyck | af51a9f | 2012-10-15 10:19:55 -0700 | [diff] [blame] | 477 | memcpy(buffer + offset, vaddr, sz); |
Cong Wang | c3eede8 | 2011-11-25 23:14:39 +0800 | [diff] [blame] | 478 | kunmap_atomic(buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | local_irq_restore(flags); |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 480 | |
| 481 | size -= sz; |
| 482 | pfn++; |
Alexander Duyck | af51a9f | 2012-10-15 10:19:55 -0700 | [diff] [blame] | 483 | vaddr += sz; |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 484 | offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | } |
Alexander Duyck | af51a9f | 2012-10-15 10:19:55 -0700 | [diff] [blame] | 486 | } else if (dir == DMA_TO_DEVICE) { |
| 487 | memcpy(vaddr, phys_to_virt(orig_addr), size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | } else { |
Alexander Duyck | af51a9f | 2012-10-15 10:19:55 -0700 | [diff] [blame] | 489 | memcpy(phys_to_virt(orig_addr), vaddr, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | } |
| 491 | } |
| 492 | |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 493 | phys_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 Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 496 | enum dma_data_direction dir, |
| 497 | unsigned long attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | { |
| 499 | unsigned long flags; |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 500 | phys_addr_t tlb_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | unsigned int nslots, stride, index, wrap; |
| 502 | int i; |
FUJITA Tomonori | 681cc5c | 2008-02-04 22:28:16 -0800 | [diff] [blame] | 503 | unsigned long mask; |
| 504 | unsigned long offset_slots; |
| 505 | unsigned long max_slots; |
| 506 | |
Yinghai Lu | ac2cbab | 2013-01-24 12:20:16 -0800 | [diff] [blame] | 507 | 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 Lendacky | d7b417f | 2017-10-20 09:30:53 -0500 | [diff] [blame] | 510 | 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 Lendacky | 648babb | 2017-07-17 16:10:22 -0500 | [diff] [blame] | 513 | |
FUJITA Tomonori | 681cc5c | 2008-02-04 22:28:16 -0800 | [diff] [blame] | 514 | mask = dma_get_seg_boundary(hwdev); |
FUJITA Tomonori | 681cc5c | 2008-02-04 22:28:16 -0800 | [diff] [blame] | 515 | |
FUJITA Tomonori | eb605a5 | 2010-05-10 15:14:54 -0400 | [diff] [blame] | 516 | tbl_dma_addr &= mask; |
| 517 | |
| 518 | offset_slots = ALIGN(tbl_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; |
Ian Campbell | a5ddde4a | 2008-12-16 12:17:29 -0800 | [diff] [blame] | 519 | |
| 520 | /* |
| 521 | * Carefully handle integer overflow which can occur when mask == ~0UL. |
| 522 | */ |
Jan Beulich | b15a3891 | 2008-03-13 09:13:30 +0000 | [diff] [blame] | 523 | max_slots = mask + 1 |
| 524 | ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT |
| 525 | : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | |
| 527 | /* |
Nikita Yushchenko | 602d985 | 2017-01-11 21:56:31 +0300 | [diff] [blame] | 528 | * For mappings greater than or equal to a page, we limit the stride |
| 529 | * (and hence alignment) to a page size. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | */ |
| 531 | nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; |
Nikita Yushchenko | 602d985 | 2017-01-11 21:56:31 +0300 | [diff] [blame] | 532 | if (size >= PAGE_SIZE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT)); |
| 534 | else |
| 535 | stride = 1; |
| 536 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 537 | BUG_ON(!nslots); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | |
| 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 Morton | a7133a1 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 544 | index = ALIGN(io_tlb_index, stride); |
| 545 | if (index >= io_tlb_nslabs) |
| 546 | index = 0; |
| 547 | wrap = index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
Andrew Morton | a7133a1 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 549 | do { |
FUJITA Tomonori | a852250 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 550 | while (iommu_is_span_boundary(index, nslots, offset_slots, |
| 551 | max_slots)) { |
Jan Beulich | b15a3891 | 2008-03-13 09:13:30 +0000 | [diff] [blame] | 552 | index += stride; |
| 553 | if (index >= io_tlb_nslabs) |
| 554 | index = 0; |
Andrew Morton | a7133a1 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 555 | if (index == wrap) |
| 556 | goto not_found; |
| 557 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
Andrew Morton | a7133a1 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 559 | /* |
| 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 Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 571 | tlb_addr = io_tlb_start + (index << IO_TLB_SHIFT); |
Andrew Morton | a7133a1 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 572 | |
| 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 | |
| 587 | not_found: |
| 588 | spin_unlock_irqrestore(&io_tlb_lock, flags); |
Konrad Rzeszutek Wilk | 0cb637b | 2013-12-16 14:05:01 -0500 | [diff] [blame] | 589 | if (printk_ratelimit()) |
| 590 | dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes)\n", size); |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 591 | return SWIOTLB_MAP_ERROR; |
Andrew Morton | a7133a1 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 592 | found: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | 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 Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 600 | for (i = 0; i < nslots; i++) |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 601 | io_tlb_orig_addr[index+i] = orig_addr + (i << IO_TLB_SHIFT); |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 602 | if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) && |
| 603 | (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)) |
Alexander Duyck | af51a9f | 2012-10-15 10:19:55 -0700 | [diff] [blame] | 604 | swiotlb_bounce(orig_addr, tlb_addr, size, DMA_TO_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 606 | return tlb_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | } |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 608 | EXPORT_SYMBOL_GPL(swiotlb_tbl_map_single); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
| 610 | /* |
FUJITA Tomonori | eb605a5 | 2010-05-10 15:14:54 -0400 | [diff] [blame] | 611 | * Allocates bounce buffer and returns its kernel virtual address. |
| 612 | */ |
| 613 | |
Alexandre Courbot | 023600f | 2015-05-26 18:02:54 +0900 | [diff] [blame] | 614 | static phys_addr_t |
| 615 | map_single(struct device *hwdev, phys_addr_t phys, size_t size, |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 616 | enum dma_data_direction dir, unsigned long attrs) |
FUJITA Tomonori | eb605a5 | 2010-05-10 15:14:54 -0400 | [diff] [blame] | 617 | { |
Geert Uytterhoeven | fff5d99 | 2016-12-16 14:28:42 +0100 | [diff] [blame] | 618 | dma_addr_t start_dma_addr; |
FUJITA Tomonori | eb605a5 | 2010-05-10 15:14:54 -0400 | [diff] [blame] | 619 | |
Geert Uytterhoeven | fff5d99 | 2016-12-16 14:28:42 +0100 | [diff] [blame] | 620 | if (swiotlb_force == SWIOTLB_NO_FORCE) { |
| 621 | dev_warn_ratelimited(hwdev, "Cannot do DMA to address %pa\n", |
| 622 | &phys); |
| 623 | return SWIOTLB_MAP_ERROR; |
| 624 | } |
| 625 | |
Tom Lendacky | c775320 | 2017-07-17 16:10:21 -0500 | [diff] [blame] | 626 | start_dma_addr = swiotlb_phys_to_dma(hwdev, io_tlb_start); |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 627 | return swiotlb_tbl_map_single(hwdev, start_dma_addr, phys, size, |
| 628 | dir, attrs); |
FUJITA Tomonori | eb605a5 | 2010-05-10 15:14:54 -0400 | [diff] [blame] | 629 | } |
| 630 | |
| 631 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | * dma_addr is the kernel virtual address of the bounce buffer to unmap. |
| 633 | */ |
Alexander Duyck | 61ca08c | 2012-10-15 10:19:44 -0700 | [diff] [blame] | 634 | void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr, |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 635 | size_t size, enum dma_data_direction dir, |
| 636 | unsigned long attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | { |
| 638 | unsigned long flags; |
| 639 | int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; |
Alexander Duyck | 61ca08c | 2012-10-15 10:19:44 -0700 | [diff] [blame] | 640 | int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT; |
| 641 | phys_addr_t orig_addr = io_tlb_orig_addr[index]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
| 643 | /* |
| 644 | * First, sync the memory before unmapping the entry |
| 645 | */ |
Jan Beulich | 8e0629c | 2014-06-02 14:58:25 +0100 | [diff] [blame] | 646 | if (orig_addr != INVALID_PHYS_ADDR && |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 647 | !(attrs & DMA_ATTR_SKIP_CPU_SYNC) && |
Jan Beulich | 8e0629c | 2014-06-02 14:58:25 +0100 | [diff] [blame] | 648 | ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL))) |
Alexander Duyck | af51a9f | 2012-10-15 10:19:55 -0700 | [diff] [blame] | 649 | swiotlb_bounce(orig_addr, tlb_addr, size, DMA_FROM_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | |
| 651 | /* |
| 652 | * Return the buffer to the free list by setting the corresponding |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 653 | * entries to indicate the number of contiguous entries available. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | * While returning the entries to the free list, we merge the entries |
| 655 | * with slots below and above the pool being returned. |
| 656 | */ |
| 657 | spin_lock_irqsave(&io_tlb_lock, flags); |
| 658 | { |
| 659 | count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ? |
| 660 | io_tlb_list[index + nslots] : 0); |
| 661 | /* |
| 662 | * Step 1: return the slots to the free list, merging the |
| 663 | * slots with superceeding slots |
| 664 | */ |
Jan Beulich | 8e0629c | 2014-06-02 14:58:25 +0100 | [diff] [blame] | 665 | for (i = index + nslots - 1; i >= index; i--) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | io_tlb_list[i] = ++count; |
Jan Beulich | 8e0629c | 2014-06-02 14:58:25 +0100 | [diff] [blame] | 667 | io_tlb_orig_addr[i] = INVALID_PHYS_ADDR; |
| 668 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | /* |
| 670 | * Step 2: merge the returned slots with the preceding slots, |
| 671 | * if available (non zero) |
| 672 | */ |
| 673 | for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--) |
| 674 | io_tlb_list[i] = ++count; |
| 675 | } |
| 676 | spin_unlock_irqrestore(&io_tlb_lock, flags); |
| 677 | } |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 678 | EXPORT_SYMBOL_GPL(swiotlb_tbl_unmap_single); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
Alexander Duyck | fbfda89 | 2012-10-15 10:19:49 -0700 | [diff] [blame] | 680 | void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr, |
| 681 | size_t size, enum dma_data_direction dir, |
| 682 | enum dma_sync_target target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | { |
Alexander Duyck | fbfda89 | 2012-10-15 10:19:49 -0700 | [diff] [blame] | 684 | int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT; |
| 685 | phys_addr_t orig_addr = io_tlb_orig_addr[index]; |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 686 | |
Jan Beulich | 8e0629c | 2014-06-02 14:58:25 +0100 | [diff] [blame] | 687 | if (orig_addr == INVALID_PHYS_ADDR) |
| 688 | return; |
Alexander Duyck | fbfda89 | 2012-10-15 10:19:49 -0700 | [diff] [blame] | 689 | orig_addr += (unsigned long)tlb_addr & ((1 << IO_TLB_SHIFT) - 1); |
Keir Fraser | df336d1 | 2007-07-21 04:37:24 -0700 | [diff] [blame] | 690 | |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 691 | switch (target) { |
| 692 | case SYNC_FOR_CPU: |
| 693 | if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)) |
Alexander Duyck | af51a9f | 2012-10-15 10:19:55 -0700 | [diff] [blame] | 694 | swiotlb_bounce(orig_addr, tlb_addr, |
Alexander Duyck | fbfda89 | 2012-10-15 10:19:49 -0700 | [diff] [blame] | 695 | size, DMA_FROM_DEVICE); |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 696 | else |
| 697 | BUG_ON(dir != DMA_TO_DEVICE); |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 698 | break; |
| 699 | case SYNC_FOR_DEVICE: |
| 700 | if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)) |
Alexander Duyck | af51a9f | 2012-10-15 10:19:55 -0700 | [diff] [blame] | 701 | swiotlb_bounce(orig_addr, tlb_addr, |
Alexander Duyck | fbfda89 | 2012-10-15 10:19:49 -0700 | [diff] [blame] | 702 | size, DMA_TO_DEVICE); |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 703 | else |
| 704 | BUG_ON(dir != DMA_FROM_DEVICE); |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 705 | break; |
| 706 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | BUG(); |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 708 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | } |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 710 | EXPORT_SYMBOL_GPL(swiotlb_tbl_sync_single); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | |
| 712 | void * |
| 713 | swiotlb_alloc_coherent(struct device *hwdev, size_t size, |
Al Viro | 06a5449 | 2005-10-21 03:21:03 -0400 | [diff] [blame] | 714 | dma_addr_t *dma_handle, gfp_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | { |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 716 | dma_addr_t dev_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | void *ret; |
| 718 | int order = get_order(size); |
Yang Hongyang | 284901a | 2009-04-06 19:01:15 -0700 | [diff] [blame] | 719 | u64 dma_mask = DMA_BIT_MASK(32); |
FUJITA Tomonori | 1e74f30 | 2008-11-17 16:24:34 +0900 | [diff] [blame] | 720 | |
| 721 | if (hwdev && hwdev->coherent_dma_mask) |
| 722 | dma_mask = hwdev->coherent_dma_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
Tony Luck | 25667d6 | 2007-03-06 13:31:45 -0800 | [diff] [blame] | 724 | ret = (void *)__get_free_pages(flags, order); |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 725 | if (ret) { |
| 726 | dev_addr = swiotlb_virt_to_bus(hwdev, ret); |
| 727 | if (dev_addr + size - 1 > dma_mask) { |
| 728 | /* |
| 729 | * The allocated memory isn't reachable by the device. |
| 730 | */ |
| 731 | free_pages((unsigned long) ret, order); |
| 732 | ret = NULL; |
| 733 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | } |
| 735 | if (!ret) { |
| 736 | /* |
Konrad Rzeszutek Wilk | bfc5501 | 2010-05-10 15:54:20 -0400 | [diff] [blame] | 737 | * We are either out of memory or the device can't DMA to |
| 738 | * GFP_DMA memory; fall back on map_single(), which |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 739 | * will grab memory from the lowest available address range. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | */ |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 741 | phys_addr_t paddr = map_single(hwdev, 0, size, |
| 742 | DMA_FROM_DEVICE, 0); |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 743 | if (paddr == SWIOTLB_MAP_ERROR) |
Joerg Roedel | 94cc81f | 2015-06-10 17:49:40 +0200 | [diff] [blame] | 744 | goto err_warn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 746 | ret = phys_to_virt(paddr); |
Tom Lendacky | c775320 | 2017-07-17 16:10:21 -0500 | [diff] [blame] | 747 | dev_addr = swiotlb_phys_to_dma(hwdev, paddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | |
Alexander Duyck | 61ca08c | 2012-10-15 10:19:44 -0700 | [diff] [blame] | 749 | /* Confirm address can be DMA'd by device */ |
| 750 | if (dev_addr + size - 1 > dma_mask) { |
| 751 | printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n", |
| 752 | (unsigned long long)dma_mask, |
| 753 | (unsigned long long)dev_addr); |
FUJITA Tomonori | a2b89b5 | 2008-10-23 18:42:03 +0900 | [diff] [blame] | 754 | |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 755 | /* |
| 756 | * DMA_TO_DEVICE to avoid memcpy in unmap_single. |
| 757 | * The DMA_ATTR_SKIP_CPU_SYNC is optional. |
| 758 | */ |
Alexander Duyck | 61ca08c | 2012-10-15 10:19:44 -0700 | [diff] [blame] | 759 | swiotlb_tbl_unmap_single(hwdev, paddr, |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 760 | size, DMA_TO_DEVICE, |
| 761 | DMA_ATTR_SKIP_CPU_SYNC); |
Joerg Roedel | 94cc81f | 2015-06-10 17:49:40 +0200 | [diff] [blame] | 762 | goto err_warn; |
Alexander Duyck | 61ca08c | 2012-10-15 10:19:44 -0700 | [diff] [blame] | 763 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | } |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 765 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | *dma_handle = dev_addr; |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 767 | memset(ret, 0, size); |
| 768 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | return ret; |
Joerg Roedel | 94cc81f | 2015-06-10 17:49:40 +0200 | [diff] [blame] | 770 | |
| 771 | err_warn: |
| 772 | pr_warn("swiotlb: coherent allocation failed for device %s size=%zu\n", |
| 773 | dev_name(hwdev), size); |
| 774 | dump_stack(); |
| 775 | |
| 776 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 778 | EXPORT_SYMBOL(swiotlb_alloc_coherent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
| 780 | void |
| 781 | swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 782 | dma_addr_t dev_addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | { |
FUJITA Tomonori | 862d196 | 2009-07-10 10:05:02 +0900 | [diff] [blame] | 784 | phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 785 | |
David Brownell | aa24886 | 2007-08-10 13:10:27 -0700 | [diff] [blame] | 786 | WARN_ON(irqs_disabled()); |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 787 | if (!is_swiotlb_buffer(paddr)) |
| 788 | free_pages((unsigned long)vaddr, get_order(size)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | else |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 790 | /* |
| 791 | * DMA_TO_DEVICE to avoid memcpy in swiotlb_tbl_unmap_single. |
| 792 | * DMA_ATTR_SKIP_CPU_SYNC is optional. |
| 793 | */ |
| 794 | swiotlb_tbl_unmap_single(hwdev, paddr, size, DMA_TO_DEVICE, |
| 795 | DMA_ATTR_SKIP_CPU_SYNC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 797 | EXPORT_SYMBOL(swiotlb_free_coherent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | |
| 799 | static void |
Konrad Rzeszutek Wilk | 22d4826 | 2010-05-10 15:01:15 -0500 | [diff] [blame] | 800 | swiotlb_full(struct device *dev, size_t size, enum dma_data_direction dir, |
| 801 | int do_panic) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | { |
Geert Uytterhoeven | fff5d99 | 2016-12-16 14:28:42 +0100 | [diff] [blame] | 803 | if (swiotlb_force == SWIOTLB_NO_FORCE) |
| 804 | return; |
| 805 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | /* |
| 807 | * Ran out of IOMMU space for this operation. This is very bad. |
| 808 | * Unfortunately the drivers cannot handle this operation properly. |
Tony Luck | 17e5ad6 | 2005-09-29 15:52:13 -0700 | [diff] [blame] | 809 | * unless they check for dma_mapping_error (most don't) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | * When the mapping is small enough return a static buffer to limit |
| 811 | * the damage, or panic when the transfer is too big. |
| 812 | */ |
Geert Uytterhoeven | 0d2e189 | 2016-10-31 16:45:03 +0100 | [diff] [blame] | 813 | dev_err_ratelimited(dev, "DMA: Out of SW-IOMMU space for %zu bytes\n", |
| 814 | size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
Casey Dahlin | c7084b3 | 2009-08-20 16:27:56 -0700 | [diff] [blame] | 816 | if (size <= io_tlb_overflow || !do_panic) |
| 817 | return; |
| 818 | |
| 819 | if (dir == DMA_BIDIRECTIONAL) |
| 820 | panic("DMA: Random memory could be DMA accessed\n"); |
| 821 | if (dir == DMA_FROM_DEVICE) |
| 822 | panic("DMA: Random memory could be DMA written\n"); |
| 823 | if (dir == DMA_TO_DEVICE) |
| 824 | panic("DMA: Random memory could be DMA read\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | } |
| 826 | |
| 827 | /* |
| 828 | * Map a single buffer of the indicated size for DMA in streaming mode. The |
Tony Luck | 17e5ad6 | 2005-09-29 15:52:13 -0700 | [diff] [blame] | 829 | * physical address to use is returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | * |
| 831 | * Once the device is given the dma address, the device owns this memory until |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 832 | * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | */ |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 834 | dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, |
| 835 | unsigned long offset, size_t size, |
| 836 | enum dma_data_direction dir, |
Krzysztof Kozlowski | 00085f1 | 2016-08-03 13:46:00 -0700 | [diff] [blame] | 837 | unsigned long attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | { |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 839 | phys_addr_t map, phys = page_to_phys(page) + offset; |
FUJITA Tomonori | 862d196 | 2009-07-10 10:05:02 +0900 | [diff] [blame] | 840 | dma_addr_t dev_addr = phys_to_dma(dev, phys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 842 | BUG_ON(dir == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | /* |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 844 | * If the address happens to be in the device's DMA window, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | * we can safely return the device addr and not worry about bounce |
| 846 | * buffering it. |
| 847 | */ |
Geert Uytterhoeven | ae7871b | 2016-12-16 14:28:41 +0100 | [diff] [blame] | 848 | if (dma_capable(dev, dev_addr, size) && swiotlb_force != SWIOTLB_FORCE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | return dev_addr; |
| 850 | |
Zoltan Kiss | 2b2b614 | 2013-09-04 21:11:05 +0100 | [diff] [blame] | 851 | trace_swiotlb_bounced(dev, dev_addr, size, swiotlb_force); |
| 852 | |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 853 | /* Oh well, have to allocate and map a bounce buffer. */ |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 854 | map = map_single(dev, phys, size, dir, attrs); |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 855 | if (map == SWIOTLB_MAP_ERROR) { |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 856 | swiotlb_full(dev, size, dir, 1); |
Tom Lendacky | c775320 | 2017-07-17 16:10:21 -0500 | [diff] [blame] | 857 | return swiotlb_phys_to_dma(dev, io_tlb_overflow_buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | } |
| 859 | |
Tom Lendacky | c775320 | 2017-07-17 16:10:21 -0500 | [diff] [blame] | 860 | dev_addr = swiotlb_phys_to_dma(dev, map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 862 | /* Ensure that the address returned is DMA'ble */ |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 863 | if (dma_capable(dev, dev_addr, size)) |
| 864 | return dev_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | |
Alexander Duyck | d29fa0c | 2016-11-10 07:05:31 -0500 | [diff] [blame] | 866 | attrs |= DMA_ATTR_SKIP_CPU_SYNC; |
| 867 | swiotlb_tbl_unmap_single(dev, map, size, dir, attrs); |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 868 | |
Tom Lendacky | c775320 | 2017-07-17 16:10:21 -0500 | [diff] [blame] | 869 | return swiotlb_phys_to_dma(dev, io_tlb_overflow_buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | } |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 871 | EXPORT_SYMBOL_GPL(swiotlb_map_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
| 873 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | * Unmap a single streaming mode DMA translation. The dma_addr and size must |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 875 | * match what was provided for in a previous swiotlb_map_page call. All |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | * other usages are undefined. |
| 877 | * |
| 878 | * After this call, reads by the cpu to the buffer are guaranteed to see |
| 879 | * whatever the device wrote there. |
| 880 | */ |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 881 | static void unmap_single(struct device *hwdev, dma_addr_t dev_addr, |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 882 | size_t size, enum dma_data_direction dir, |
| 883 | unsigned long attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | { |
FUJITA Tomonori | 862d196 | 2009-07-10 10:05:02 +0900 | [diff] [blame] | 885 | phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 887 | BUG_ON(dir == DMA_NONE); |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 888 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 889 | if (is_swiotlb_buffer(paddr)) { |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 890 | swiotlb_tbl_unmap_single(hwdev, paddr, size, dir, attrs); |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 891 | return; |
| 892 | } |
| 893 | |
| 894 | if (dir != DMA_FROM_DEVICE) |
| 895 | return; |
| 896 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 897 | /* |
| 898 | * phys_to_virt doesn't work with hihgmem page but we could |
| 899 | * call dma_mark_clean() with hihgmem page here. However, we |
| 900 | * are fine since dma_mark_clean() is null on POWERPC. We can |
| 901 | * make dma_mark_clean() take a physical address if necessary. |
| 902 | */ |
| 903 | dma_mark_clean(phys_to_virt(paddr), size); |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 904 | } |
| 905 | |
| 906 | void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, |
| 907 | size_t size, enum dma_data_direction dir, |
Krzysztof Kozlowski | 00085f1 | 2016-08-03 13:46:00 -0700 | [diff] [blame] | 908 | unsigned long attrs) |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 909 | { |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 910 | unmap_single(hwdev, dev_addr, size, dir, attrs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | } |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 912 | EXPORT_SYMBOL_GPL(swiotlb_unmap_page); |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 913 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | /* |
| 915 | * Make physical memory consistent for a single streaming mode DMA translation |
| 916 | * after a transfer. |
| 917 | * |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 918 | * If you perform a swiotlb_map_page() but wish to interrogate the buffer |
Tony Luck | 17e5ad6 | 2005-09-29 15:52:13 -0700 | [diff] [blame] | 919 | * using the cpu, yet do not wish to teardown the dma mapping, you must |
| 920 | * call this function before doing so. At the next point you give the dma |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | * address back to the card, you must first perform a |
| 922 | * swiotlb_dma_sync_for_device, and then the device again owns the buffer |
| 923 | */ |
Andrew Morton | be6b026 | 2007-02-12 00:52:17 -0800 | [diff] [blame] | 924 | static void |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 925 | swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr, |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 926 | size_t size, enum dma_data_direction dir, |
| 927 | enum dma_sync_target target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | { |
FUJITA Tomonori | 862d196 | 2009-07-10 10:05:02 +0900 | [diff] [blame] | 929 | phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 931 | BUG_ON(dir == DMA_NONE); |
Becky Bruce | 380d687 | 2009-04-08 09:09:20 -0500 | [diff] [blame] | 932 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 933 | if (is_swiotlb_buffer(paddr)) { |
Alexander Duyck | fbfda89 | 2012-10-15 10:19:49 -0700 | [diff] [blame] | 934 | swiotlb_tbl_sync_single(hwdev, paddr, size, dir, target); |
Becky Bruce | 380d687 | 2009-04-08 09:09:20 -0500 | [diff] [blame] | 935 | return; |
| 936 | } |
| 937 | |
| 938 | if (dir != DMA_FROM_DEVICE) |
| 939 | return; |
| 940 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 941 | dma_mark_clean(phys_to_virt(paddr), size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | } |
| 943 | |
| 944 | void |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 945 | swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 946 | size_t size, enum dma_data_direction dir) |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 947 | { |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 948 | swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU); |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 949 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 950 | EXPORT_SYMBOL(swiotlb_sync_single_for_cpu); |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 951 | |
| 952 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 954 | size_t size, enum dma_data_direction dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | { |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 956 | swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 958 | EXPORT_SYMBOL(swiotlb_sync_single_for_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | |
| 960 | /* |
| 961 | * Map a set of buffers described by scatterlist in streaming mode for DMA. |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 962 | * This is the scatter-gather version of the above swiotlb_map_page |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | * interface. Here the scatter gather list elements are each tagged with the |
| 964 | * appropriate dma address and length. They are obtained via |
| 965 | * sg_dma_{address,length}(SG). |
| 966 | * |
| 967 | * NOTE: An implementation may be able to use a smaller number of |
| 968 | * DMA address/length pairs than there are SG table elements. |
| 969 | * (for example via virtual mapping capabilities) |
| 970 | * The routine returns the number of addr/length pairs actually |
| 971 | * used, at most nents. |
| 972 | * |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 973 | * Device ownership issues as mentioned above for swiotlb_map_page are the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | * same here. |
| 975 | */ |
| 976 | int |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 977 | swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, |
Krzysztof Kozlowski | 00085f1 | 2016-08-03 13:46:00 -0700 | [diff] [blame] | 978 | enum dma_data_direction dir, unsigned long attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | { |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 980 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | int i; |
| 982 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 983 | BUG_ON(dir == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 985 | for_each_sg(sgl, sg, nelems, i) { |
Ian Campbell | 961d7d0 | 2009-01-09 18:32:10 +0000 | [diff] [blame] | 986 | phys_addr_t paddr = sg_phys(sg); |
FUJITA Tomonori | 862d196 | 2009-07-10 10:05:02 +0900 | [diff] [blame] | 987 | dma_addr_t dev_addr = phys_to_dma(hwdev, paddr); |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 988 | |
Geert Uytterhoeven | ae7871b | 2016-12-16 14:28:41 +0100 | [diff] [blame] | 989 | if (swiotlb_force == SWIOTLB_FORCE || |
FUJITA Tomonori | b939464 | 2009-07-10 10:04:58 +0900 | [diff] [blame] | 990 | !dma_capable(hwdev, dev_addr, sg->length)) { |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 991 | phys_addr_t map = map_single(hwdev, sg_phys(sg), |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 992 | sg->length, dir, attrs); |
Alexander Duyck | e05ed4d | 2012-10-15 10:19:39 -0700 | [diff] [blame] | 993 | if (map == SWIOTLB_MAP_ERROR) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | /* Don't panic here, we expect map_sg users |
| 995 | to do proper error handling. */ |
| 996 | swiotlb_full(hwdev, sg->length, dir, 0); |
Alexander Duyck | d29fa0c | 2016-11-10 07:05:31 -0500 | [diff] [blame] | 997 | attrs |= DMA_ATTR_SKIP_CPU_SYNC; |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 998 | swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir, |
| 999 | attrs); |
EunBong Song | 4d86ec7 | 2013-08-05 17:30:47 +0100 | [diff] [blame] | 1000 | sg_dma_len(sgl) = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | return 0; |
| 1002 | } |
Tom Lendacky | c775320 | 2017-07-17 16:10:21 -0500 | [diff] [blame] | 1003 | sg->dma_address = swiotlb_phys_to_dma(hwdev, map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | } else |
| 1005 | sg->dma_address = dev_addr; |
EunBong Song | 4d86ec7 | 2013-08-05 17:30:47 +0100 | [diff] [blame] | 1006 | sg_dma_len(sg) = sg->length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | } |
| 1008 | return nelems; |
| 1009 | } |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 1010 | EXPORT_SYMBOL(swiotlb_map_sg_attrs); |
| 1011 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | /* |
| 1013 | * Unmap a set of streaming mode DMA translations. Again, cpu read rules |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 1014 | * concerning calls here are the same as for swiotlb_unmap_page() above. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | */ |
| 1016 | void |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 1017 | swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, |
Krzysztof Kozlowski | 00085f1 | 2016-08-03 13:46:00 -0700 | [diff] [blame] | 1018 | int nelems, enum dma_data_direction dir, |
| 1019 | unsigned long attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | { |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 1021 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | int i; |
| 1023 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 1024 | BUG_ON(dir == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 1026 | for_each_sg(sgl, sg, nelems, i) |
Alexander Duyck | 0443fa0 | 2016-11-02 07:13:02 -0400 | [diff] [blame] | 1027 | unmap_single(hwdev, sg->dma_address, sg_dma_len(sg), dir, |
| 1028 | attrs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | } |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 1030 | EXPORT_SYMBOL(swiotlb_unmap_sg_attrs); |
| 1031 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | /* |
| 1033 | * Make physical memory consistent for a set of streaming mode DMA translations |
| 1034 | * after a transfer. |
| 1035 | * |
| 1036 | * The same as swiotlb_sync_single_* but for a scatter-gather list, same rules |
| 1037 | * and usage. |
| 1038 | */ |
Andrew Morton | be6b026 | 2007-02-12 00:52:17 -0800 | [diff] [blame] | 1039 | static void |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 1040 | swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl, |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 1041 | int nelems, enum dma_data_direction dir, |
| 1042 | enum dma_sync_target target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | { |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 1044 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | int i; |
| 1046 | |
Becky Bruce | 380d687 | 2009-04-08 09:09:20 -0500 | [diff] [blame] | 1047 | for_each_sg(sgl, sg, nelems, i) |
| 1048 | swiotlb_sync_single(hwdev, sg->dma_address, |
EunBong Song | 4d86ec7 | 2013-08-05 17:30:47 +0100 | [diff] [blame] | 1049 | sg_dma_len(sg), dir, target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | } |
| 1051 | |
| 1052 | void |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 1053 | swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 1054 | int nelems, enum dma_data_direction dir) |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 1055 | { |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 1056 | swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU); |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 1057 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 1058 | EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu); |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 1059 | |
| 1060 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 1062 | int nelems, enum dma_data_direction dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | { |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 1064 | swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 1066 | EXPORT_SYMBOL(swiotlb_sync_sg_for_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | |
| 1068 | int |
FUJITA Tomonori | 8d8bb39 | 2008-07-25 19:44:49 -0700 | [diff] [blame] | 1069 | swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | { |
Tom Lendacky | c775320 | 2017-07-17 16:10:21 -0500 | [diff] [blame] | 1071 | return (dma_addr == swiotlb_phys_to_dma(hwdev, io_tlb_overflow_buffer)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 1073 | EXPORT_SYMBOL(swiotlb_dma_mapping_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | |
| 1075 | /* |
Tony Luck | 17e5ad6 | 2005-09-29 15:52:13 -0700 | [diff] [blame] | 1076 | * Return whether the given device DMA address mask can be supported |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | * properly. For example, if your device can only drive the low 24-bits |
Tony Luck | 17e5ad6 | 2005-09-29 15:52:13 -0700 | [diff] [blame] | 1078 | * during bus mastering, then you would pass 0x00ffffff as the mask to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | * this function. |
| 1080 | */ |
| 1081 | int |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 1082 | swiotlb_dma_supported(struct device *hwdev, u64 mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | { |
Tom Lendacky | c775320 | 2017-07-17 16:10:21 -0500 | [diff] [blame] | 1084 | return swiotlb_phys_to_dma(hwdev, io_tlb_end - 1) <= mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | EXPORT_SYMBOL(swiotlb_dma_supported); |