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> |
| 23 | #include <linux/module.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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #include <asm/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <asm/dma.h> |
Tony Luck | 17e5ad6 | 2005-09-29 15:52:13 -0700 | [diff] [blame] | 35 | #include <asm/scatterlist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | #include <linux/init.h> |
| 38 | #include <linux/bootmem.h> |
FUJITA Tomonori | a852250 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 39 | #include <linux/iommu-helper.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | #define OFFSET(val,align) ((unsigned long) \ |
| 42 | ( (val) & ( (align) - 1))) |
| 43 | |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 44 | #define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT)) |
| 45 | |
| 46 | /* |
| 47 | * Minimum IO TLB size to bother booting with. Systems with mainly |
| 48 | * 64bit capable cards will only lightly use the swiotlb. If we can't |
| 49 | * allocate a contiguous 1MB, we're probably in trouble anyway. |
| 50 | */ |
| 51 | #define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT) |
| 52 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | int swiotlb_force; |
| 54 | |
| 55 | /* |
Konrad Rzeszutek Wilk | bfc5501 | 2010-05-10 15:54:20 -0400 | [diff] [blame] | 56 | * Used to do a quick range check in swiotlb_tbl_unmap_single and |
| 57 | * swiotlb_tbl_sync_single_*, to see if the memory was in fact allocated by this |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | * API. |
| 59 | */ |
| 60 | static char *io_tlb_start, *io_tlb_end; |
| 61 | |
| 62 | /* |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 63 | * 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] | 64 | * io_tlb_end. This is command line adjustable via setup_io_tlb_npages. |
| 65 | */ |
| 66 | static unsigned long io_tlb_nslabs; |
| 67 | |
| 68 | /* |
| 69 | * When the IOMMU overflows we return a fallback buffer. This sets the size. |
| 70 | */ |
| 71 | static unsigned long io_tlb_overflow = 32*1024; |
| 72 | |
FUJITA Tomonori | 03620b2 | 2010-08-02 23:48:06 +0900 | [diff] [blame] | 73 | static void *io_tlb_overflow_buffer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
| 75 | /* |
| 76 | * This is a free list describing the number of free entries available from |
| 77 | * each index |
| 78 | */ |
| 79 | static unsigned int *io_tlb_list; |
| 80 | static unsigned int io_tlb_index; |
| 81 | |
| 82 | /* |
| 83 | * We need to save away the original address corresponding to a mapped entry |
| 84 | * for the sync operations. |
| 85 | */ |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 86 | static phys_addr_t *io_tlb_orig_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
| 88 | /* |
| 89 | * Protect the above data structures in the map and unmap calls |
| 90 | */ |
| 91 | static DEFINE_SPINLOCK(io_tlb_lock); |
| 92 | |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 93 | static int late_alloc; |
| 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | static int __init |
| 96 | setup_io_tlb_npages(char *str) |
| 97 | { |
| 98 | if (isdigit(*str)) { |
Alex Williamson | e8579e7 | 2005-08-04 13:06:00 -0700 | [diff] [blame] | 99 | io_tlb_nslabs = simple_strtoul(str, &str, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | /* avoid tail segment of size < IO_TLB_SEGSIZE */ |
| 101 | io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); |
| 102 | } |
| 103 | if (*str == ',') |
| 104 | ++str; |
FUJITA Tomonori | b18485e | 2009-11-12 00:03:28 +0900 | [diff] [blame] | 105 | if (!strcmp(str, "force")) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | swiotlb_force = 1; |
FUJITA Tomonori | b18485e | 2009-11-12 00:03:28 +0900 | [diff] [blame] | 107 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | return 1; |
| 109 | } |
| 110 | __setup("swiotlb=", setup_io_tlb_npages); |
| 111 | /* make io_tlb_overflow tunable too? */ |
| 112 | |
Konrad Rzeszutek Wilk | f21ffe9 | 2011-08-11 16:50:56 -0400 | [diff] [blame] | 113 | unsigned long swiotlb_nr_tbl(void) |
FUJITA Tomonori | 5f98ecd | 2011-06-05 11:47:29 +0900 | [diff] [blame] | 114 | { |
| 115 | return io_tlb_nslabs; |
| 116 | } |
Konrad Rzeszutek Wilk | f21ffe9 | 2011-08-11 16:50:56 -0400 | [diff] [blame] | 117 | EXPORT_SYMBOL_GPL(swiotlb_nr_tbl); |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 118 | /* Note that this doesn't work with highmem page */ |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 119 | static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev, |
| 120 | volatile void *address) |
Ian Campbell | e08e1f7 | 2008-12-16 12:17:30 -0800 | [diff] [blame] | 121 | { |
FUJITA Tomonori | 862d196 | 2009-07-10 10:05:02 +0900 | [diff] [blame] | 122 | return phys_to_dma(hwdev, virt_to_phys(address)); |
Ian Campbell | e08e1f7 | 2008-12-16 12:17:30 -0800 | [diff] [blame] | 123 | } |
| 124 | |
FUJITA Tomonori | ad32e8c | 2009-11-10 19:46:19 +0900 | [diff] [blame] | 125 | void swiotlb_print_info(void) |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 126 | { |
FUJITA Tomonori | ad32e8c | 2009-11-10 19:46:19 +0900 | [diff] [blame] | 127 | unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT; |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 128 | phys_addr_t pstart, pend; |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 129 | |
| 130 | pstart = virt_to_phys(io_tlb_start); |
| 131 | pend = virt_to_phys(io_tlb_end); |
| 132 | |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 133 | printk(KERN_INFO "Placing %luMB software IO TLB between %p - %p\n", |
| 134 | bytes >> 20, io_tlb_start, io_tlb_end); |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 135 | printk(KERN_INFO "software IO TLB at phys %#llx - %#llx\n", |
| 136 | (unsigned long long)pstart, |
| 137 | (unsigned long long)pend); |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 138 | } |
| 139 | |
FUJITA Tomonori | abbceff | 2010-05-10 15:15:12 -0400 | [diff] [blame] | 140 | void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | { |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 142 | unsigned long i, bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
FUJITA Tomonori | abbceff | 2010-05-10 15:15:12 -0400 | [diff] [blame] | 144 | bytes = nslabs << IO_TLB_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
FUJITA Tomonori | abbceff | 2010-05-10 15:15:12 -0400 | [diff] [blame] | 146 | io_tlb_nslabs = nslabs; |
| 147 | io_tlb_start = tlb; |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 148 | io_tlb_end = io_tlb_start + bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | /* |
| 151 | * Allocate and initialize the free list array. This array is used |
| 152 | * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE |
| 153 | * between io_tlb_start and io_tlb_end. |
| 154 | */ |
Yinghai Lu | e79f86b | 2010-10-11 10:40:25 -0700 | [diff] [blame] | 155 | io_tlb_list = alloc_bootmem_pages(PAGE_ALIGN(io_tlb_nslabs * sizeof(int))); |
Tony Luck | 25667d6 | 2007-03-06 13:31:45 -0800 | [diff] [blame] | 156 | for (i = 0; i < io_tlb_nslabs; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE); |
| 158 | io_tlb_index = 0; |
Yinghai Lu | e79f86b | 2010-10-11 10:40:25 -0700 | [diff] [blame] | 159 | io_tlb_orig_addr = alloc_bootmem_pages(PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
| 161 | /* |
| 162 | * Get the overflow emergency buffer |
| 163 | */ |
Yinghai Lu | e79f86b | 2010-10-11 10:40:25 -0700 | [diff] [blame] | 164 | io_tlb_overflow_buffer = alloc_bootmem_low_pages(PAGE_ALIGN(io_tlb_overflow)); |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 165 | if (!io_tlb_overflow_buffer) |
| 166 | panic("Cannot allocate SWIOTLB overflow buffer!\n"); |
FUJITA Tomonori | ad32e8c | 2009-11-10 19:46:19 +0900 | [diff] [blame] | 167 | if (verbose) |
| 168 | swiotlb_print_info(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | } |
| 170 | |
FUJITA Tomonori | abbceff | 2010-05-10 15:15:12 -0400 | [diff] [blame] | 171 | /* |
| 172 | * Statically reserve bounce buffer space and initialize bounce buffer data |
| 173 | * structures for the software IO TLB used to implement the DMA API. |
| 174 | */ |
| 175 | void __init |
| 176 | swiotlb_init_with_default_size(size_t default_size, int verbose) |
| 177 | { |
| 178 | unsigned long bytes; |
| 179 | |
| 180 | if (!io_tlb_nslabs) { |
| 181 | io_tlb_nslabs = (default_size >> IO_TLB_SHIFT); |
| 182 | io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); |
| 183 | } |
| 184 | |
| 185 | bytes = io_tlb_nslabs << IO_TLB_SHIFT; |
| 186 | |
| 187 | /* |
| 188 | * Get IO TLB memory from the low pages |
| 189 | */ |
Yinghai Lu | e79f86b | 2010-10-11 10:40:25 -0700 | [diff] [blame] | 190 | io_tlb_start = alloc_bootmem_low_pages(PAGE_ALIGN(bytes)); |
FUJITA Tomonori | abbceff | 2010-05-10 15:15:12 -0400 | [diff] [blame] | 191 | if (!io_tlb_start) |
| 192 | panic("Cannot allocate SWIOTLB buffer"); |
| 193 | |
| 194 | swiotlb_init_with_tbl(io_tlb_start, io_tlb_nslabs, verbose); |
| 195 | } |
| 196 | |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 197 | void __init |
FUJITA Tomonori | ad32e8c | 2009-11-10 19:46:19 +0900 | [diff] [blame] | 198 | swiotlb_init(int verbose) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | { |
FUJITA Tomonori | ad32e8c | 2009-11-10 19:46:19 +0900 | [diff] [blame] | 200 | swiotlb_init_with_default_size(64 * (1<<20), verbose); /* default to 64MB */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | } |
| 202 | |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 203 | /* |
| 204 | * Systems with larger DMA zones (those that don't support ISA) can |
| 205 | * initialize the swiotlb later using the slab allocator if needed. |
| 206 | * This should be just like above, but with some error catching. |
| 207 | */ |
| 208 | int |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 209 | swiotlb_late_init_with_default_size(size_t default_size) |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 210 | { |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 211 | unsigned long i, bytes, req_nslabs = io_tlb_nslabs; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 212 | unsigned int order; |
| 213 | |
| 214 | if (!io_tlb_nslabs) { |
| 215 | io_tlb_nslabs = (default_size >> IO_TLB_SHIFT); |
| 216 | io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * Get IO TLB memory from the low pages |
| 221 | */ |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 222 | order = get_order(io_tlb_nslabs << IO_TLB_SHIFT); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 223 | io_tlb_nslabs = SLABS_PER_PAGE << order; |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 224 | bytes = io_tlb_nslabs << IO_TLB_SHIFT; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 225 | |
| 226 | while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) { |
FUJITA Tomonori | bb52196 | 2009-07-10 10:04:51 +0900 | [diff] [blame] | 227 | io_tlb_start = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, |
| 228 | order); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 229 | if (io_tlb_start) |
| 230 | break; |
| 231 | order--; |
| 232 | } |
| 233 | |
| 234 | if (!io_tlb_start) |
| 235 | goto cleanup1; |
| 236 | |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 237 | if (order != get_order(bytes)) { |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 238 | printk(KERN_WARNING "Warning: only able to allocate %ld MB " |
| 239 | "for software IO TLB\n", (PAGE_SIZE << order) >> 20); |
| 240 | io_tlb_nslabs = SLABS_PER_PAGE << order; |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 241 | bytes = io_tlb_nslabs << IO_TLB_SHIFT; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 242 | } |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 243 | io_tlb_end = io_tlb_start + bytes; |
| 244 | memset(io_tlb_start, 0, bytes); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 245 | |
| 246 | /* |
| 247 | * Allocate and initialize the free list array. This array is used |
| 248 | * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE |
| 249 | * between io_tlb_start and io_tlb_end. |
| 250 | */ |
| 251 | io_tlb_list = (unsigned int *)__get_free_pages(GFP_KERNEL, |
| 252 | get_order(io_tlb_nslabs * sizeof(int))); |
| 253 | if (!io_tlb_list) |
| 254 | goto cleanup2; |
| 255 | |
| 256 | for (i = 0; i < io_tlb_nslabs; i++) |
| 257 | io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE); |
| 258 | io_tlb_index = 0; |
| 259 | |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 260 | io_tlb_orig_addr = (phys_addr_t *) |
| 261 | __get_free_pages(GFP_KERNEL, |
| 262 | get_order(io_tlb_nslabs * |
| 263 | sizeof(phys_addr_t))); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 264 | if (!io_tlb_orig_addr) |
| 265 | goto cleanup3; |
| 266 | |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 267 | memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(phys_addr_t)); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 268 | |
| 269 | /* |
| 270 | * Get the overflow emergency buffer |
| 271 | */ |
| 272 | io_tlb_overflow_buffer = (void *)__get_free_pages(GFP_DMA, |
| 273 | get_order(io_tlb_overflow)); |
| 274 | if (!io_tlb_overflow_buffer) |
| 275 | goto cleanup4; |
| 276 | |
FUJITA Tomonori | ad32e8c | 2009-11-10 19:46:19 +0900 | [diff] [blame] | 277 | swiotlb_print_info(); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 278 | |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 279 | late_alloc = 1; |
| 280 | |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 281 | return 0; |
| 282 | |
| 283 | cleanup4: |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 284 | free_pages((unsigned long)io_tlb_orig_addr, |
| 285 | get_order(io_tlb_nslabs * sizeof(phys_addr_t))); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 286 | io_tlb_orig_addr = NULL; |
| 287 | cleanup3: |
Tony Luck | 25667d6 | 2007-03-06 13:31:45 -0800 | [diff] [blame] | 288 | free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs * |
| 289 | sizeof(int))); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 290 | io_tlb_list = NULL; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 291 | cleanup2: |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 292 | io_tlb_end = NULL; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 293 | free_pages((unsigned long)io_tlb_start, order); |
| 294 | io_tlb_start = NULL; |
| 295 | cleanup1: |
| 296 | io_tlb_nslabs = req_nslabs; |
| 297 | return -ENOMEM; |
| 298 | } |
| 299 | |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 300 | void __init swiotlb_free(void) |
| 301 | { |
| 302 | if (!io_tlb_overflow_buffer) |
| 303 | return; |
| 304 | |
| 305 | if (late_alloc) { |
| 306 | free_pages((unsigned long)io_tlb_overflow_buffer, |
| 307 | get_order(io_tlb_overflow)); |
| 308 | free_pages((unsigned long)io_tlb_orig_addr, |
| 309 | get_order(io_tlb_nslabs * sizeof(phys_addr_t))); |
| 310 | free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs * |
| 311 | sizeof(int))); |
| 312 | free_pages((unsigned long)io_tlb_start, |
| 313 | get_order(io_tlb_nslabs << IO_TLB_SHIFT)); |
| 314 | } else { |
| 315 | free_bootmem_late(__pa(io_tlb_overflow_buffer), |
Yinghai Lu | e79f86b | 2010-10-11 10:40:25 -0700 | [diff] [blame] | 316 | PAGE_ALIGN(io_tlb_overflow)); |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 317 | free_bootmem_late(__pa(io_tlb_orig_addr), |
Yinghai Lu | e79f86b | 2010-10-11 10:40:25 -0700 | [diff] [blame] | 318 | PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t))); |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 319 | free_bootmem_late(__pa(io_tlb_list), |
Yinghai Lu | e79f86b | 2010-10-11 10:40:25 -0700 | [diff] [blame] | 320 | PAGE_ALIGN(io_tlb_nslabs * sizeof(int))); |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 321 | free_bootmem_late(__pa(io_tlb_start), |
Yinghai Lu | e79f86b | 2010-10-11 10:40:25 -0700 | [diff] [blame] | 322 | PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT)); |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 323 | } |
Konrad Rzeszutek Wilk | f21ffe9 | 2011-08-11 16:50:56 -0400 | [diff] [blame] | 324 | io_tlb_nslabs = 0; |
FUJITA Tomonori | 5740afd | 2009-11-10 19:46:18 +0900 | [diff] [blame] | 325 | } |
| 326 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 327 | static int is_swiotlb_buffer(phys_addr_t paddr) |
FUJITA Tomonori | 640aebf | 2008-09-08 18:53:50 +0900 | [diff] [blame] | 328 | { |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 329 | return paddr >= virt_to_phys(io_tlb_start) && |
| 330 | paddr < virt_to_phys(io_tlb_end); |
FUJITA Tomonori | 640aebf | 2008-09-08 18:53:50 +0900 | [diff] [blame] | 331 | } |
| 332 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | /* |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 334 | * Bounce: copy the swiotlb buffer back to the original dma location |
| 335 | */ |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 336 | void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size, |
| 337 | enum dma_data_direction dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | { |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 339 | unsigned long pfn = PFN_DOWN(phys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 341 | if (PageHighMem(pfn_to_page(pfn))) { |
| 342 | /* The buffer does not have a mapping. Map it in and copy */ |
| 343 | unsigned int offset = phys & ~PAGE_MASK; |
| 344 | char *buffer; |
| 345 | unsigned int sz = 0; |
| 346 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 348 | while (size) { |
Becky Bruce | 67131ad | 2009-04-08 09:09:16 -0500 | [diff] [blame] | 349 | sz = min_t(size_t, PAGE_SIZE - offset, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 351 | local_irq_save(flags); |
Cong Wang | c3eede8 | 2011-11-25 23:14:39 +0800 | [diff] [blame] | 352 | buffer = kmap_atomic(pfn_to_page(pfn)); |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 353 | if (dir == DMA_TO_DEVICE) |
| 354 | memcpy(dma_addr, buffer + offset, sz); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | else |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 356 | memcpy(buffer + offset, dma_addr, sz); |
Cong Wang | c3eede8 | 2011-11-25 23:14:39 +0800 | [diff] [blame] | 357 | kunmap_atomic(buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | local_irq_restore(flags); |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 359 | |
| 360 | size -= sz; |
| 361 | pfn++; |
| 362 | dma_addr += sz; |
| 363 | offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | } |
| 365 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | if (dir == DMA_TO_DEVICE) |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 367 | memcpy(dma_addr, phys_to_virt(phys), size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | else |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 369 | memcpy(phys_to_virt(phys), dma_addr, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | } |
| 371 | } |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 372 | EXPORT_SYMBOL_GPL(swiotlb_bounce); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
FUJITA Tomonori | eb605a5 | 2010-05-10 15:14:54 -0400 | [diff] [blame] | 374 | void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr, |
Konrad Rzeszutek Wilk | 22d4826 | 2010-05-10 15:01:15 -0500 | [diff] [blame] | 375 | phys_addr_t phys, size_t size, |
| 376 | enum dma_data_direction dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | { |
| 378 | unsigned long flags; |
| 379 | char *dma_addr; |
| 380 | unsigned int nslots, stride, index, wrap; |
| 381 | int i; |
FUJITA Tomonori | 681cc5c | 2008-02-04 22:28:16 -0800 | [diff] [blame] | 382 | unsigned long mask; |
| 383 | unsigned long offset_slots; |
| 384 | unsigned long max_slots; |
| 385 | |
| 386 | mask = dma_get_seg_boundary(hwdev); |
FUJITA Tomonori | 681cc5c | 2008-02-04 22:28:16 -0800 | [diff] [blame] | 387 | |
FUJITA Tomonori | eb605a5 | 2010-05-10 15:14:54 -0400 | [diff] [blame] | 388 | tbl_dma_addr &= mask; |
| 389 | |
| 390 | 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] | 391 | |
| 392 | /* |
| 393 | * Carefully handle integer overflow which can occur when mask == ~0UL. |
| 394 | */ |
Jan Beulich | b15a3891 | 2008-03-13 09:13:30 +0000 | [diff] [blame] | 395 | max_slots = mask + 1 |
| 396 | ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT |
| 397 | : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
| 399 | /* |
| 400 | * For mappings greater than a page, we limit the stride (and |
| 401 | * hence alignment) to a page size. |
| 402 | */ |
| 403 | nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; |
| 404 | if (size > PAGE_SIZE) |
| 405 | stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT)); |
| 406 | else |
| 407 | stride = 1; |
| 408 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 409 | BUG_ON(!nslots); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
| 411 | /* |
| 412 | * Find suitable number of IO TLB entries size that will fit this |
| 413 | * request and allocate a buffer from that IO TLB pool. |
| 414 | */ |
| 415 | spin_lock_irqsave(&io_tlb_lock, flags); |
Andrew Morton | a7133a1 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 416 | index = ALIGN(io_tlb_index, stride); |
| 417 | if (index >= io_tlb_nslabs) |
| 418 | index = 0; |
| 419 | wrap = index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | |
Andrew Morton | a7133a1 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 421 | do { |
FUJITA Tomonori | a852250 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 422 | while (iommu_is_span_boundary(index, nslots, offset_slots, |
| 423 | max_slots)) { |
Jan Beulich | b15a3891 | 2008-03-13 09:13:30 +0000 | [diff] [blame] | 424 | index += stride; |
| 425 | if (index >= io_tlb_nslabs) |
| 426 | index = 0; |
Andrew Morton | a7133a1 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 427 | if (index == wrap) |
| 428 | goto not_found; |
| 429 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
Andrew Morton | a7133a1 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 431 | /* |
| 432 | * If we find a slot that indicates we have 'nslots' number of |
| 433 | * contiguous buffers, we allocate the buffers from that slot |
| 434 | * and mark the entries as '0' indicating unavailable. |
| 435 | */ |
| 436 | if (io_tlb_list[index] >= nslots) { |
| 437 | int count = 0; |
| 438 | |
| 439 | for (i = index; i < (int) (index + nslots); i++) |
| 440 | io_tlb_list[i] = 0; |
| 441 | for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE - 1) && io_tlb_list[i]; i--) |
| 442 | io_tlb_list[i] = ++count; |
| 443 | dma_addr = io_tlb_start + (index << IO_TLB_SHIFT); |
| 444 | |
| 445 | /* |
| 446 | * Update the indices to avoid searching in the next |
| 447 | * round. |
| 448 | */ |
| 449 | io_tlb_index = ((index + nslots) < io_tlb_nslabs |
| 450 | ? (index + nslots) : 0); |
| 451 | |
| 452 | goto found; |
| 453 | } |
| 454 | index += stride; |
| 455 | if (index >= io_tlb_nslabs) |
| 456 | index = 0; |
| 457 | } while (index != wrap); |
| 458 | |
| 459 | not_found: |
| 460 | spin_unlock_irqrestore(&io_tlb_lock, flags); |
| 461 | return NULL; |
| 462 | found: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | spin_unlock_irqrestore(&io_tlb_lock, flags); |
| 464 | |
| 465 | /* |
| 466 | * Save away the mapping from the original address to the DMA address. |
| 467 | * This is needed when we sync the memory. Then we sync the buffer if |
| 468 | * needed. |
| 469 | */ |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 470 | for (i = 0; i < nslots; i++) |
| 471 | io_tlb_orig_addr[index+i] = phys + (i << IO_TLB_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 473 | swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | |
| 475 | return dma_addr; |
| 476 | } |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 477 | EXPORT_SYMBOL_GPL(swiotlb_tbl_map_single); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | |
| 479 | /* |
FUJITA Tomonori | eb605a5 | 2010-05-10 15:14:54 -0400 | [diff] [blame] | 480 | * Allocates bounce buffer and returns its kernel virtual address. |
| 481 | */ |
| 482 | |
| 483 | static void * |
Konrad Rzeszutek Wilk | 22d4826 | 2010-05-10 15:01:15 -0500 | [diff] [blame] | 484 | map_single(struct device *hwdev, phys_addr_t phys, size_t size, |
| 485 | enum dma_data_direction dir) |
FUJITA Tomonori | eb605a5 | 2010-05-10 15:14:54 -0400 | [diff] [blame] | 486 | { |
| 487 | dma_addr_t start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start); |
| 488 | |
| 489 | return swiotlb_tbl_map_single(hwdev, start_dma_addr, phys, size, dir); |
| 490 | } |
| 491 | |
| 492 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | * dma_addr is the kernel virtual address of the bounce buffer to unmap. |
| 494 | */ |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 495 | void |
Konrad Rzeszutek Wilk | bfc5501 | 2010-05-10 15:54:20 -0400 | [diff] [blame] | 496 | swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr, size_t size, |
Konrad Rzeszutek Wilk | 22d4826 | 2010-05-10 15:01:15 -0500 | [diff] [blame] | 497 | enum dma_data_direction dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | { |
| 499 | unsigned long flags; |
| 500 | int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; |
| 501 | int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT; |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 502 | phys_addr_t phys = io_tlb_orig_addr[index]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
| 504 | /* |
| 505 | * First, sync the memory before unmapping the entry |
| 506 | */ |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 507 | if (phys && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL))) |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 508 | swiotlb_bounce(phys, dma_addr, size, DMA_FROM_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
| 510 | /* |
| 511 | * Return the buffer to the free list by setting the corresponding |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 512 | * entries to indicate the number of contiguous entries available. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | * While returning the entries to the free list, we merge the entries |
| 514 | * with slots below and above the pool being returned. |
| 515 | */ |
| 516 | spin_lock_irqsave(&io_tlb_lock, flags); |
| 517 | { |
| 518 | count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ? |
| 519 | io_tlb_list[index + nslots] : 0); |
| 520 | /* |
| 521 | * Step 1: return the slots to the free list, merging the |
| 522 | * slots with superceeding slots |
| 523 | */ |
| 524 | for (i = index + nslots - 1; i >= index; i--) |
| 525 | io_tlb_list[i] = ++count; |
| 526 | /* |
| 527 | * Step 2: merge the returned slots with the preceding slots, |
| 528 | * if available (non zero) |
| 529 | */ |
| 530 | for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--) |
| 531 | io_tlb_list[i] = ++count; |
| 532 | } |
| 533 | spin_unlock_irqrestore(&io_tlb_lock, flags); |
| 534 | } |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 535 | EXPORT_SYMBOL_GPL(swiotlb_tbl_unmap_single); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 537 | void |
Konrad Rzeszutek Wilk | bfc5501 | 2010-05-10 15:54:20 -0400 | [diff] [blame] | 538 | swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr, size_t size, |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 539 | enum dma_data_direction dir, |
| 540 | enum dma_sync_target target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | { |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 542 | int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT; |
| 543 | phys_addr_t phys = io_tlb_orig_addr[index]; |
| 544 | |
| 545 | phys += ((unsigned long)dma_addr & ((1 << IO_TLB_SHIFT) - 1)); |
Keir Fraser | df336d1 | 2007-07-21 04:37:24 -0700 | [diff] [blame] | 546 | |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 547 | switch (target) { |
| 548 | case SYNC_FOR_CPU: |
| 549 | if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)) |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 550 | swiotlb_bounce(phys, dma_addr, size, DMA_FROM_DEVICE); |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 551 | else |
| 552 | BUG_ON(dir != DMA_TO_DEVICE); |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 553 | break; |
| 554 | case SYNC_FOR_DEVICE: |
| 555 | if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)) |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 556 | swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE); |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 557 | else |
| 558 | BUG_ON(dir != DMA_FROM_DEVICE); |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 559 | break; |
| 560 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | BUG(); |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 562 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 564 | EXPORT_SYMBOL_GPL(swiotlb_tbl_sync_single); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | |
| 566 | void * |
| 567 | swiotlb_alloc_coherent(struct device *hwdev, size_t size, |
Al Viro | 06a5449 | 2005-10-21 03:21:03 -0400 | [diff] [blame] | 568 | dma_addr_t *dma_handle, gfp_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | { |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 570 | dma_addr_t dev_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | void *ret; |
| 572 | int order = get_order(size); |
Yang Hongyang | 284901a | 2009-04-06 19:01:15 -0700 | [diff] [blame] | 573 | u64 dma_mask = DMA_BIT_MASK(32); |
FUJITA Tomonori | 1e74f30 | 2008-11-17 16:24:34 +0900 | [diff] [blame] | 574 | |
| 575 | if (hwdev && hwdev->coherent_dma_mask) |
| 576 | dma_mask = hwdev->coherent_dma_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | |
Tony Luck | 25667d6 | 2007-03-06 13:31:45 -0800 | [diff] [blame] | 578 | ret = (void *)__get_free_pages(flags, order); |
Jan Beulich | ac2b3e6 | 2009-12-15 16:47:43 -0800 | [diff] [blame] | 579 | if (ret && swiotlb_virt_to_bus(hwdev, ret) + size - 1 > dma_mask) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | /* |
| 581 | * The allocated memory isn't reachable by the device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | */ |
| 583 | free_pages((unsigned long) ret, order); |
| 584 | ret = NULL; |
| 585 | } |
| 586 | if (!ret) { |
| 587 | /* |
Konrad Rzeszutek Wilk | bfc5501 | 2010-05-10 15:54:20 -0400 | [diff] [blame] | 588 | * We are either out of memory or the device can't DMA to |
| 589 | * GFP_DMA memory; fall back on map_single(), which |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 590 | * will grab memory from the lowest available address range. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | */ |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 592 | ret = map_single(hwdev, 0, size, DMA_FROM_DEVICE); |
FUJITA Tomonori | 9dfda12 | 2008-09-08 18:53:48 +0900 | [diff] [blame] | 593 | if (!ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | } |
| 596 | |
| 597 | memset(ret, 0, size); |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 598 | dev_addr = swiotlb_virt_to_bus(hwdev, ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
| 600 | /* Confirm address can be DMA'd by device */ |
Jan Beulich | ac2b3e6 | 2009-12-15 16:47:43 -0800 | [diff] [blame] | 601 | if (dev_addr + size - 1 > dma_mask) { |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 602 | printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n", |
FUJITA Tomonori | 1e74f30 | 2008-11-17 16:24:34 +0900 | [diff] [blame] | 603 | (unsigned long long)dma_mask, |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 604 | (unsigned long long)dev_addr); |
FUJITA Tomonori | a2b89b5 | 2008-10-23 18:42:03 +0900 | [diff] [blame] | 605 | |
| 606 | /* DMA_TO_DEVICE to avoid memcpy in unmap_single */ |
Konrad Rzeszutek Wilk | bfc5501 | 2010-05-10 15:54:20 -0400 | [diff] [blame] | 607 | swiotlb_tbl_unmap_single(hwdev, ret, size, DMA_TO_DEVICE); |
FUJITA Tomonori | a2b89b5 | 2008-10-23 18:42:03 +0900 | [diff] [blame] | 608 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | } |
| 610 | *dma_handle = dev_addr; |
| 611 | return ret; |
| 612 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 613 | EXPORT_SYMBOL(swiotlb_alloc_coherent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | |
| 615 | void |
| 616 | swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 617 | dma_addr_t dev_addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | { |
FUJITA Tomonori | 862d196 | 2009-07-10 10:05:02 +0900 | [diff] [blame] | 619 | phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 620 | |
David Brownell | aa24886 | 2007-08-10 13:10:27 -0700 | [diff] [blame] | 621 | WARN_ON(irqs_disabled()); |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 622 | if (!is_swiotlb_buffer(paddr)) |
| 623 | free_pages((unsigned long)vaddr, get_order(size)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | else |
Konrad Rzeszutek Wilk | bfc5501 | 2010-05-10 15:54:20 -0400 | [diff] [blame] | 625 | /* DMA_TO_DEVICE to avoid memcpy in swiotlb_tbl_unmap_single */ |
| 626 | swiotlb_tbl_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 628 | EXPORT_SYMBOL(swiotlb_free_coherent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
| 630 | static void |
Konrad Rzeszutek Wilk | 22d4826 | 2010-05-10 15:01:15 -0500 | [diff] [blame] | 631 | swiotlb_full(struct device *dev, size_t size, enum dma_data_direction dir, |
| 632 | int do_panic) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | { |
| 634 | /* |
| 635 | * Ran out of IOMMU space for this operation. This is very bad. |
| 636 | * Unfortunately the drivers cannot handle this operation properly. |
Tony Luck | 17e5ad6 | 2005-09-29 15:52:13 -0700 | [diff] [blame] | 637 | * unless they check for dma_mapping_error (most don't) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | * When the mapping is small enough return a static buffer to limit |
| 639 | * the damage, or panic when the transfer is too big. |
| 640 | */ |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 641 | printk(KERN_ERR "DMA: Out of SW-IOMMU space for %zu bytes at " |
Kay Sievers | 94b3248 | 2009-01-06 10:44:37 -0800 | [diff] [blame] | 642 | "device %s\n", size, dev ? dev_name(dev) : "?"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
Casey Dahlin | c7084b3 | 2009-08-20 16:27:56 -0700 | [diff] [blame] | 644 | if (size <= io_tlb_overflow || !do_panic) |
| 645 | return; |
| 646 | |
| 647 | if (dir == DMA_BIDIRECTIONAL) |
| 648 | panic("DMA: Random memory could be DMA accessed\n"); |
| 649 | if (dir == DMA_FROM_DEVICE) |
| 650 | panic("DMA: Random memory could be DMA written\n"); |
| 651 | if (dir == DMA_TO_DEVICE) |
| 652 | panic("DMA: Random memory could be DMA read\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | } |
| 654 | |
| 655 | /* |
| 656 | * 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] | 657 | * physical address to use is returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | * |
| 659 | * 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] | 660 | * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | */ |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 662 | dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, |
| 663 | unsigned long offset, size_t size, |
| 664 | enum dma_data_direction dir, |
| 665 | struct dma_attrs *attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | { |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 667 | phys_addr_t phys = page_to_phys(page) + offset; |
FUJITA Tomonori | 862d196 | 2009-07-10 10:05:02 +0900 | [diff] [blame] | 668 | dma_addr_t dev_addr = phys_to_dma(dev, phys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | void *map; |
| 670 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 671 | BUG_ON(dir == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | /* |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 673 | * If the address happens to be in the device's DMA window, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | * we can safely return the device addr and not worry about bounce |
| 675 | * buffering it. |
| 676 | */ |
FUJITA Tomonori | b939464 | 2009-07-10 10:04:58 +0900 | [diff] [blame] | 677 | if (dma_capable(dev, dev_addr, size) && !swiotlb_force) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | return dev_addr; |
| 679 | |
| 680 | /* |
| 681 | * Oh well, have to allocate and map a bounce buffer. |
| 682 | */ |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 683 | map = map_single(dev, phys, size, dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | if (!map) { |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 685 | swiotlb_full(dev, size, dir, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | map = io_tlb_overflow_buffer; |
| 687 | } |
| 688 | |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 689 | dev_addr = swiotlb_virt_to_bus(dev, map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
| 691 | /* |
| 692 | * Ensure that the address returned is DMA'ble |
| 693 | */ |
FUJITA Tomonori | fba99fa | 2011-02-25 14:44:16 -0800 | [diff] [blame] | 694 | if (!dma_capable(dev, dev_addr, size)) { |
| 695 | swiotlb_tbl_unmap_single(dev, map, size, dir); |
| 696 | dev_addr = swiotlb_virt_to_bus(dev, io_tlb_overflow_buffer); |
| 697 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
| 699 | return dev_addr; |
| 700 | } |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 701 | EXPORT_SYMBOL_GPL(swiotlb_map_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
| 703 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | * 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] | 705 | * 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] | 706 | * other usages are undefined. |
| 707 | * |
| 708 | * After this call, reads by the cpu to the buffer are guaranteed to see |
| 709 | * whatever the device wrote there. |
| 710 | */ |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 711 | static void unmap_single(struct device *hwdev, dma_addr_t dev_addr, |
Konrad Rzeszutek Wilk | 22d4826 | 2010-05-10 15:01:15 -0500 | [diff] [blame] | 712 | size_t size, enum dma_data_direction dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | { |
FUJITA Tomonori | 862d196 | 2009-07-10 10:05:02 +0900 | [diff] [blame] | 714 | phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 716 | BUG_ON(dir == DMA_NONE); |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 717 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 718 | if (is_swiotlb_buffer(paddr)) { |
Konrad Rzeszutek Wilk | bfc5501 | 2010-05-10 15:54:20 -0400 | [diff] [blame] | 719 | swiotlb_tbl_unmap_single(hwdev, phys_to_virt(paddr), size, dir); |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 720 | return; |
| 721 | } |
| 722 | |
| 723 | if (dir != DMA_FROM_DEVICE) |
| 724 | return; |
| 725 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 726 | /* |
| 727 | * phys_to_virt doesn't work with hihgmem page but we could |
| 728 | * call dma_mark_clean() with hihgmem page here. However, we |
| 729 | * are fine since dma_mark_clean() is null on POWERPC. We can |
| 730 | * make dma_mark_clean() take a physical address if necessary. |
| 731 | */ |
| 732 | dma_mark_clean(phys_to_virt(paddr), size); |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 733 | } |
| 734 | |
| 735 | void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, |
| 736 | size_t size, enum dma_data_direction dir, |
| 737 | struct dma_attrs *attrs) |
| 738 | { |
| 739 | unmap_single(hwdev, dev_addr, size, dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | } |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 741 | EXPORT_SYMBOL_GPL(swiotlb_unmap_page); |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | /* |
| 744 | * Make physical memory consistent for a single streaming mode DMA translation |
| 745 | * after a transfer. |
| 746 | * |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 747 | * 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] | 748 | * using the cpu, yet do not wish to teardown the dma mapping, you must |
| 749 | * 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] | 750 | * address back to the card, you must first perform a |
| 751 | * swiotlb_dma_sync_for_device, and then the device again owns the buffer |
| 752 | */ |
Andrew Morton | be6b026 | 2007-02-12 00:52:17 -0800 | [diff] [blame] | 753 | static void |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 754 | swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr, |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 755 | size_t size, enum dma_data_direction dir, |
| 756 | enum dma_sync_target target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | { |
FUJITA Tomonori | 862d196 | 2009-07-10 10:05:02 +0900 | [diff] [blame] | 758 | phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 760 | BUG_ON(dir == DMA_NONE); |
Becky Bruce | 380d687 | 2009-04-08 09:09:20 -0500 | [diff] [blame] | 761 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 762 | if (is_swiotlb_buffer(paddr)) { |
Konrad Rzeszutek Wilk | bfc5501 | 2010-05-10 15:54:20 -0400 | [diff] [blame] | 763 | swiotlb_tbl_sync_single(hwdev, phys_to_virt(paddr), size, dir, |
| 764 | target); |
Becky Bruce | 380d687 | 2009-04-08 09:09:20 -0500 | [diff] [blame] | 765 | return; |
| 766 | } |
| 767 | |
| 768 | if (dir != DMA_FROM_DEVICE) |
| 769 | return; |
| 770 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame] | 771 | dma_mark_clean(phys_to_virt(paddr), size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | } |
| 773 | |
| 774 | void |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 775 | 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] | 776 | size_t size, enum dma_data_direction dir) |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 777 | { |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 778 | swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU); |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 779 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 780 | EXPORT_SYMBOL(swiotlb_sync_single_for_cpu); |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 781 | |
| 782 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | 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] | 784 | size_t size, enum dma_data_direction dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | { |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 786 | swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 788 | EXPORT_SYMBOL(swiotlb_sync_single_for_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | |
| 790 | /* |
| 791 | * 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] | 792 | * This is the scatter-gather version of the above swiotlb_map_page |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | * interface. Here the scatter gather list elements are each tagged with the |
| 794 | * appropriate dma address and length. They are obtained via |
| 795 | * sg_dma_{address,length}(SG). |
| 796 | * |
| 797 | * NOTE: An implementation may be able to use a smaller number of |
| 798 | * DMA address/length pairs than there are SG table elements. |
| 799 | * (for example via virtual mapping capabilities) |
| 800 | * The routine returns the number of addr/length pairs actually |
| 801 | * used, at most nents. |
| 802 | * |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 803 | * Device ownership issues as mentioned above for swiotlb_map_page are the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | * same here. |
| 805 | */ |
| 806 | int |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 807 | swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 808 | enum dma_data_direction dir, struct dma_attrs *attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | { |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 810 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | int i; |
| 812 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 813 | BUG_ON(dir == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 815 | for_each_sg(sgl, sg, nelems, i) { |
Ian Campbell | 961d7d0 | 2009-01-09 18:32:10 +0000 | [diff] [blame] | 816 | phys_addr_t paddr = sg_phys(sg); |
FUJITA Tomonori | 862d196 | 2009-07-10 10:05:02 +0900 | [diff] [blame] | 817 | dma_addr_t dev_addr = phys_to_dma(hwdev, paddr); |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 818 | |
FUJITA Tomonori | cf56e3f | 2009-07-10 10:04:52 +0900 | [diff] [blame] | 819 | if (swiotlb_force || |
FUJITA Tomonori | b939464 | 2009-07-10 10:04:58 +0900 | [diff] [blame] | 820 | !dma_capable(hwdev, dev_addr, sg->length)) { |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 821 | void *map = map_single(hwdev, sg_phys(sg), |
| 822 | sg->length, dir); |
Andi Kleen | 7e87023 | 2005-12-20 14:45:19 +0100 | [diff] [blame] | 823 | if (!map) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | /* Don't panic here, we expect map_sg users |
| 825 | to do proper error handling. */ |
| 826 | swiotlb_full(hwdev, sg->length, dir, 0); |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 827 | swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir, |
| 828 | attrs); |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 829 | sgl[0].dma_length = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | return 0; |
| 831 | } |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 832 | sg->dma_address = swiotlb_virt_to_bus(hwdev, map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | } else |
| 834 | sg->dma_address = dev_addr; |
| 835 | sg->dma_length = sg->length; |
| 836 | } |
| 837 | return nelems; |
| 838 | } |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 839 | EXPORT_SYMBOL(swiotlb_map_sg_attrs); |
| 840 | |
| 841 | int |
| 842 | swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems, |
Konrad Rzeszutek Wilk | 22d4826 | 2010-05-10 15:01:15 -0500 | [diff] [blame] | 843 | enum dma_data_direction dir) |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 844 | { |
| 845 | return swiotlb_map_sg_attrs(hwdev, sgl, nelems, dir, NULL); |
| 846 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 847 | EXPORT_SYMBOL(swiotlb_map_sg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
| 849 | /* |
| 850 | * Unmap a set of streaming mode DMA translations. Again, cpu read rules |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 851 | * concerning calls here are the same as for swiotlb_unmap_page() above. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | */ |
| 853 | void |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 854 | swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 855 | int nelems, enum dma_data_direction dir, struct dma_attrs *attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | { |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 857 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | int i; |
| 859 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 860 | BUG_ON(dir == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 862 | for_each_sg(sgl, sg, nelems, i) |
| 863 | unmap_single(hwdev, sg->dma_address, sg->dma_length, dir); |
| 864 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | } |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 866 | EXPORT_SYMBOL(swiotlb_unmap_sg_attrs); |
| 867 | |
| 868 | void |
| 869 | swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems, |
Konrad Rzeszutek Wilk | 22d4826 | 2010-05-10 15:01:15 -0500 | [diff] [blame] | 870 | enum dma_data_direction dir) |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 871 | { |
| 872 | return swiotlb_unmap_sg_attrs(hwdev, sgl, nelems, dir, NULL); |
| 873 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 874 | EXPORT_SYMBOL(swiotlb_unmap_sg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
| 876 | /* |
| 877 | * Make physical memory consistent for a set of streaming mode DMA translations |
| 878 | * after a transfer. |
| 879 | * |
| 880 | * The same as swiotlb_sync_single_* but for a scatter-gather list, same rules |
| 881 | * and usage. |
| 882 | */ |
Andrew Morton | be6b026 | 2007-02-12 00:52:17 -0800 | [diff] [blame] | 883 | static void |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 884 | swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl, |
Konrad Rzeszutek Wilk | d7ef153 | 2010-05-28 11:37:10 -0400 | [diff] [blame] | 885 | int nelems, enum dma_data_direction dir, |
| 886 | enum dma_sync_target target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | { |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 888 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | int i; |
| 890 | |
Becky Bruce | 380d687 | 2009-04-08 09:09:20 -0500 | [diff] [blame] | 891 | for_each_sg(sgl, sg, nelems, i) |
| 892 | swiotlb_sync_single(hwdev, sg->dma_address, |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 893 | sg->dma_length, dir, target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | } |
| 895 | |
| 896 | void |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 897 | swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 898 | int nelems, enum dma_data_direction dir) |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 899 | { |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 900 | swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU); |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 901 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 902 | EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu); |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 903 | |
| 904 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 906 | int nelems, enum dma_data_direction dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | { |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 908 | swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 910 | EXPORT_SYMBOL(swiotlb_sync_sg_for_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | |
| 912 | int |
FUJITA Tomonori | 8d8bb39 | 2008-07-25 19:44:49 -0700 | [diff] [blame] | 913 | swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | { |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 915 | return (dma_addr == swiotlb_virt_to_bus(hwdev, io_tlb_overflow_buffer)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 917 | EXPORT_SYMBOL(swiotlb_dma_mapping_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | |
| 919 | /* |
Tony Luck | 17e5ad6 | 2005-09-29 15:52:13 -0700 | [diff] [blame] | 920 | * Return whether the given device DMA address mask can be supported |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | * 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] | 922 | * during bus mastering, then you would pass 0x00ffffff as the mask to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | * this function. |
| 924 | */ |
| 925 | int |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 926 | swiotlb_dma_supported(struct device *hwdev, u64 mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | { |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 928 | return swiotlb_virt_to_bus(hwdev, io_tlb_end - 1) <= mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | EXPORT_SYMBOL(swiotlb_dma_supported); |