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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | #include <asm/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <asm/dma.h> |
Tony Luck | 17e5ad6 | 2005-09-29 15:52:13 -0700 | [diff] [blame] | 34 | #include <asm/scatterlist.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #include <linux/init.h> |
| 37 | #include <linux/bootmem.h> |
FUJITA Tomonori | a852250 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 38 | #include <linux/iommu-helper.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | #define OFFSET(val,align) ((unsigned long) \ |
| 41 | ( (val) & ( (align) - 1))) |
| 42 | |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 43 | #define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT)) |
| 44 | |
| 45 | /* |
| 46 | * Minimum IO TLB size to bother booting with. Systems with mainly |
| 47 | * 64bit capable cards will only lightly use the swiotlb. If we can't |
| 48 | * allocate a contiguous 1MB, we're probably in trouble anyway. |
| 49 | */ |
| 50 | #define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT) |
| 51 | |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 52 | /* |
| 53 | * Enumeration for sync targets |
| 54 | */ |
| 55 | enum dma_sync_target { |
| 56 | SYNC_FOR_CPU = 0, |
| 57 | SYNC_FOR_DEVICE = 1, |
| 58 | }; |
| 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | int swiotlb_force; |
| 61 | |
| 62 | /* |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 63 | * Used to do a quick range check in unmap_single and |
| 64 | * sync_single_*, to see if the memory was in fact allocated by this |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | * API. |
| 66 | */ |
| 67 | static char *io_tlb_start, *io_tlb_end; |
| 68 | |
| 69 | /* |
| 70 | * The number of IO TLB blocks (in groups of 64) betweeen io_tlb_start and |
| 71 | * io_tlb_end. This is command line adjustable via setup_io_tlb_npages. |
| 72 | */ |
| 73 | static unsigned long io_tlb_nslabs; |
| 74 | |
| 75 | /* |
| 76 | * When the IOMMU overflows we return a fallback buffer. This sets the size. |
| 77 | */ |
| 78 | static unsigned long io_tlb_overflow = 32*1024; |
| 79 | |
| 80 | void *io_tlb_overflow_buffer; |
| 81 | |
| 82 | /* |
| 83 | * This is a free list describing the number of free entries available from |
| 84 | * each index |
| 85 | */ |
| 86 | static unsigned int *io_tlb_list; |
| 87 | static unsigned int io_tlb_index; |
| 88 | |
| 89 | /* |
| 90 | * We need to save away the original address corresponding to a mapped entry |
| 91 | * for the sync operations. |
| 92 | */ |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 93 | static phys_addr_t *io_tlb_orig_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | /* |
| 96 | * Protect the above data structures in the map and unmap calls |
| 97 | */ |
| 98 | static DEFINE_SPINLOCK(io_tlb_lock); |
| 99 | |
| 100 | static int __init |
| 101 | setup_io_tlb_npages(char *str) |
| 102 | { |
| 103 | if (isdigit(*str)) { |
Alex Williamson | e8579e7 | 2005-08-04 13:06:00 -0700 | [diff] [blame] | 104 | io_tlb_nslabs = simple_strtoul(str, &str, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | /* avoid tail segment of size < IO_TLB_SEGSIZE */ |
| 106 | io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); |
| 107 | } |
| 108 | if (*str == ',') |
| 109 | ++str; |
| 110 | if (!strcmp(str, "force")) |
| 111 | swiotlb_force = 1; |
| 112 | return 1; |
| 113 | } |
| 114 | __setup("swiotlb=", setup_io_tlb_npages); |
| 115 | /* make io_tlb_overflow tunable too? */ |
| 116 | |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 117 | dma_addr_t __weak swiotlb_phys_to_bus(struct device *hwdev, phys_addr_t paddr) |
Ian Campbell | e08e1f7 | 2008-12-16 12:17:30 -0800 | [diff] [blame] | 118 | { |
| 119 | return paddr; |
| 120 | } |
| 121 | |
Becky Bruce | 42d7c5e | 2009-04-08 09:09:21 -0500 | [diff] [blame] | 122 | phys_addr_t __weak swiotlb_bus_to_phys(struct device *hwdev, dma_addr_t baddr) |
Ian Campbell | e08e1f7 | 2008-12-16 12:17:30 -0800 | [diff] [blame] | 123 | { |
| 124 | return baddr; |
| 125 | } |
| 126 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame^] | 127 | /* Note that this doesn't work with highmem page */ |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 128 | static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev, |
| 129 | volatile void *address) |
Ian Campbell | e08e1f7 | 2008-12-16 12:17:30 -0800 | [diff] [blame] | 130 | { |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 131 | return swiotlb_phys_to_bus(hwdev, virt_to_phys(address)); |
Ian Campbell | e08e1f7 | 2008-12-16 12:17:30 -0800 | [diff] [blame] | 132 | } |
| 133 | |
Becky Bruce | ef5722f | 2009-04-08 09:09:18 -0500 | [diff] [blame] | 134 | int __weak swiotlb_arch_address_needs_mapping(struct device *hwdev, |
| 135 | dma_addr_t addr, size_t size) |
| 136 | { |
| 137 | return !is_buffer_dma_capable(dma_get_mask(hwdev), addr, size); |
| 138 | } |
| 139 | |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 140 | static void swiotlb_print_info(unsigned long bytes) |
| 141 | { |
| 142 | phys_addr_t pstart, pend; |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 143 | |
| 144 | pstart = virt_to_phys(io_tlb_start); |
| 145 | pend = virt_to_phys(io_tlb_end); |
| 146 | |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 147 | printk(KERN_INFO "Placing %luMB software IO TLB between %p - %p\n", |
| 148 | bytes >> 20, io_tlb_start, io_tlb_end); |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 149 | printk(KERN_INFO "software IO TLB at phys %#llx - %#llx\n", |
| 150 | (unsigned long long)pstart, |
| 151 | (unsigned long long)pend); |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 152 | } |
| 153 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | /* |
| 155 | * Statically reserve bounce buffer space and initialize bounce buffer data |
Tony Luck | 17e5ad6 | 2005-09-29 15:52:13 -0700 | [diff] [blame] | 156 | * structures for the software IO TLB used to implement the DMA API. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | */ |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 158 | void __init |
| 159 | swiotlb_init_with_default_size(size_t default_size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | { |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 161 | unsigned long i, bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
| 163 | if (!io_tlb_nslabs) { |
Alex Williamson | e8579e7 | 2005-08-04 13:06:00 -0700 | [diff] [blame] | 164 | io_tlb_nslabs = (default_size >> IO_TLB_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); |
| 166 | } |
| 167 | |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 168 | bytes = io_tlb_nslabs << IO_TLB_SHIFT; |
| 169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | /* |
| 171 | * Get IO TLB memory from the low pages |
| 172 | */ |
FUJITA Tomonori | 3885123 | 2009-07-10 10:04:50 +0900 | [diff] [blame] | 173 | io_tlb_start = alloc_bootmem_low_pages(bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | if (!io_tlb_start) |
| 175 | panic("Cannot allocate SWIOTLB buffer"); |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 176 | io_tlb_end = io_tlb_start + bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
| 178 | /* |
| 179 | * Allocate and initialize the free list array. This array is used |
| 180 | * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE |
| 181 | * between io_tlb_start and io_tlb_end. |
| 182 | */ |
| 183 | io_tlb_list = alloc_bootmem(io_tlb_nslabs * sizeof(int)); |
Tony Luck | 25667d6 | 2007-03-06 13:31:45 -0800 | [diff] [blame] | 184 | for (i = 0; i < io_tlb_nslabs; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE); |
| 186 | io_tlb_index = 0; |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 187 | io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(phys_addr_t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
| 189 | /* |
| 190 | * Get the overflow emergency buffer |
| 191 | */ |
| 192 | io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow); |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 193 | if (!io_tlb_overflow_buffer) |
| 194 | panic("Cannot allocate SWIOTLB overflow buffer!\n"); |
| 195 | |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 196 | swiotlb_print_info(bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | } |
| 198 | |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 199 | void __init |
| 200 | swiotlb_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | { |
Tony Luck | 25667d6 | 2007-03-06 13:31:45 -0800 | [diff] [blame] | 202 | swiotlb_init_with_default_size(64 * (1<<20)); /* default to 64MB */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | } |
| 204 | |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 205 | /* |
| 206 | * Systems with larger DMA zones (those that don't support ISA) can |
| 207 | * initialize the swiotlb later using the slab allocator if needed. |
| 208 | * This should be just like above, but with some error catching. |
| 209 | */ |
| 210 | int |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 211 | swiotlb_late_init_with_default_size(size_t default_size) |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 212 | { |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 213 | unsigned long i, bytes, req_nslabs = io_tlb_nslabs; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 214 | unsigned int order; |
| 215 | |
| 216 | if (!io_tlb_nslabs) { |
| 217 | io_tlb_nslabs = (default_size >> IO_TLB_SHIFT); |
| 218 | io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); |
| 219 | } |
| 220 | |
| 221 | /* |
| 222 | * Get IO TLB memory from the low pages |
| 223 | */ |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 224 | order = get_order(io_tlb_nslabs << IO_TLB_SHIFT); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 225 | io_tlb_nslabs = SLABS_PER_PAGE << order; |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 226 | bytes = io_tlb_nslabs << IO_TLB_SHIFT; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 227 | |
| 228 | while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) { |
FUJITA Tomonori | bb52196 | 2009-07-10 10:04:51 +0900 | [diff] [blame] | 229 | io_tlb_start = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, |
| 230 | order); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 231 | if (io_tlb_start) |
| 232 | break; |
| 233 | order--; |
| 234 | } |
| 235 | |
| 236 | if (!io_tlb_start) |
| 237 | goto cleanup1; |
| 238 | |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 239 | if (order != get_order(bytes)) { |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 240 | printk(KERN_WARNING "Warning: only able to allocate %ld MB " |
| 241 | "for software IO TLB\n", (PAGE_SIZE << order) >> 20); |
| 242 | io_tlb_nslabs = SLABS_PER_PAGE << order; |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 243 | bytes = io_tlb_nslabs << IO_TLB_SHIFT; |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 244 | } |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 245 | io_tlb_end = io_tlb_start + bytes; |
| 246 | memset(io_tlb_start, 0, bytes); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 247 | |
| 248 | /* |
| 249 | * Allocate and initialize the free list array. This array is used |
| 250 | * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE |
| 251 | * between io_tlb_start and io_tlb_end. |
| 252 | */ |
| 253 | io_tlb_list = (unsigned int *)__get_free_pages(GFP_KERNEL, |
| 254 | get_order(io_tlb_nslabs * sizeof(int))); |
| 255 | if (!io_tlb_list) |
| 256 | goto cleanup2; |
| 257 | |
| 258 | for (i = 0; i < io_tlb_nslabs; i++) |
| 259 | io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE); |
| 260 | io_tlb_index = 0; |
| 261 | |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 262 | io_tlb_orig_addr = (phys_addr_t *) |
| 263 | __get_free_pages(GFP_KERNEL, |
| 264 | get_order(io_tlb_nslabs * |
| 265 | sizeof(phys_addr_t))); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 266 | if (!io_tlb_orig_addr) |
| 267 | goto cleanup3; |
| 268 | |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 269 | 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] | 270 | |
| 271 | /* |
| 272 | * Get the overflow emergency buffer |
| 273 | */ |
| 274 | io_tlb_overflow_buffer = (void *)__get_free_pages(GFP_DMA, |
| 275 | get_order(io_tlb_overflow)); |
| 276 | if (!io_tlb_overflow_buffer) |
| 277 | goto cleanup4; |
| 278 | |
Ian Campbell | 2e5b2b8 | 2008-12-16 12:17:34 -0800 | [diff] [blame] | 279 | swiotlb_print_info(bytes); |
Alex Williamson | 0b9afed | 2005-09-06 11:20:49 -0600 | [diff] [blame] | 280 | |
| 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 | |
Becky Bruce | ef5722f | 2009-04-08 09:09:18 -0500 | [diff] [blame] | 300 | static inline int |
FUJITA Tomonori | 2797982 | 2008-09-10 01:06:49 +0900 | [diff] [blame] | 301 | address_needs_mapping(struct device *hwdev, dma_addr_t addr, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | { |
Becky Bruce | ef5722f | 2009-04-08 09:09:18 -0500 | [diff] [blame] | 303 | return swiotlb_arch_address_needs_mapping(hwdev, addr, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | } |
| 305 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame^] | 306 | static int is_swiotlb_buffer(phys_addr_t paddr) |
FUJITA Tomonori | 640aebf | 2008-09-08 18:53:50 +0900 | [diff] [blame] | 307 | { |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame^] | 308 | return paddr >= virt_to_phys(io_tlb_start) && |
| 309 | paddr < virt_to_phys(io_tlb_end); |
FUJITA Tomonori | 640aebf | 2008-09-08 18:53:50 +0900 | [diff] [blame] | 310 | } |
| 311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | /* |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 313 | * Bounce: copy the swiotlb buffer back to the original dma location |
| 314 | */ |
| 315 | static void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size, |
| 316 | enum dma_data_direction dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | { |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 318 | unsigned long pfn = PFN_DOWN(phys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 320 | if (PageHighMem(pfn_to_page(pfn))) { |
| 321 | /* The buffer does not have a mapping. Map it in and copy */ |
| 322 | unsigned int offset = phys & ~PAGE_MASK; |
| 323 | char *buffer; |
| 324 | unsigned int sz = 0; |
| 325 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 327 | while (size) { |
Becky Bruce | 67131ad | 2009-04-08 09:09:16 -0500 | [diff] [blame] | 328 | sz = min_t(size_t, PAGE_SIZE - offset, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 330 | local_irq_save(flags); |
| 331 | buffer = kmap_atomic(pfn_to_page(pfn), |
| 332 | KM_BOUNCE_READ); |
| 333 | if (dir == DMA_TO_DEVICE) |
| 334 | memcpy(dma_addr, buffer + offset, sz); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | else |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 336 | memcpy(buffer + offset, dma_addr, sz); |
| 337 | kunmap_atomic(buffer, KM_BOUNCE_READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | local_irq_restore(flags); |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 339 | |
| 340 | size -= sz; |
| 341 | pfn++; |
| 342 | dma_addr += sz; |
| 343 | offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | } |
| 345 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | if (dir == DMA_TO_DEVICE) |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 347 | memcpy(dma_addr, phys_to_virt(phys), size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | else |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 349 | memcpy(phys_to_virt(phys), dma_addr, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | } |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * Allocates bounce buffer and returns its kernel virtual address. |
| 355 | */ |
| 356 | static void * |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 357 | map_single(struct device *hwdev, phys_addr_t phys, size_t size, int dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | { |
| 359 | unsigned long flags; |
| 360 | char *dma_addr; |
| 361 | unsigned int nslots, stride, index, wrap; |
| 362 | int i; |
FUJITA Tomonori | 681cc5c | 2008-02-04 22:28:16 -0800 | [diff] [blame] | 363 | unsigned long start_dma_addr; |
| 364 | unsigned long mask; |
| 365 | unsigned long offset_slots; |
| 366 | unsigned long max_slots; |
| 367 | |
| 368 | mask = dma_get_seg_boundary(hwdev); |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 369 | start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start) & mask; |
FUJITA Tomonori | 681cc5c | 2008-02-04 22:28:16 -0800 | [diff] [blame] | 370 | |
| 371 | offset_slots = ALIGN(start_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; |
Ian Campbell | a5ddde4a | 2008-12-16 12:17:29 -0800 | [diff] [blame] | 372 | |
| 373 | /* |
| 374 | * Carefully handle integer overflow which can occur when mask == ~0UL. |
| 375 | */ |
Jan Beulich | b15a3891 | 2008-03-13 09:13:30 +0000 | [diff] [blame] | 376 | max_slots = mask + 1 |
| 377 | ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT |
| 378 | : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
| 380 | /* |
| 381 | * For mappings greater than a page, we limit the stride (and |
| 382 | * hence alignment) to a page size. |
| 383 | */ |
| 384 | nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; |
| 385 | if (size > PAGE_SIZE) |
| 386 | stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT)); |
| 387 | else |
| 388 | stride = 1; |
| 389 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 390 | BUG_ON(!nslots); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
| 392 | /* |
| 393 | * Find suitable number of IO TLB entries size that will fit this |
| 394 | * request and allocate a buffer from that IO TLB pool. |
| 395 | */ |
| 396 | spin_lock_irqsave(&io_tlb_lock, flags); |
Andrew Morton | a7133a1 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 397 | index = ALIGN(io_tlb_index, stride); |
| 398 | if (index >= io_tlb_nslabs) |
| 399 | index = 0; |
| 400 | wrap = index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
Andrew Morton | a7133a1 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 402 | do { |
FUJITA Tomonori | a852250 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 403 | while (iommu_is_span_boundary(index, nslots, offset_slots, |
| 404 | max_slots)) { |
Jan Beulich | b15a3891 | 2008-03-13 09:13:30 +0000 | [diff] [blame] | 405 | index += stride; |
| 406 | if (index >= io_tlb_nslabs) |
| 407 | index = 0; |
Andrew Morton | a7133a1 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 408 | if (index == wrap) |
| 409 | goto not_found; |
| 410 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Andrew Morton | a7133a1 | 2008-04-29 00:59:36 -0700 | [diff] [blame] | 412 | /* |
| 413 | * If we find a slot that indicates we have 'nslots' number of |
| 414 | * contiguous buffers, we allocate the buffers from that slot |
| 415 | * and mark the entries as '0' indicating unavailable. |
| 416 | */ |
| 417 | if (io_tlb_list[index] >= nslots) { |
| 418 | int count = 0; |
| 419 | |
| 420 | for (i = index; i < (int) (index + nslots); i++) |
| 421 | io_tlb_list[i] = 0; |
| 422 | for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE - 1) && io_tlb_list[i]; i--) |
| 423 | io_tlb_list[i] = ++count; |
| 424 | dma_addr = io_tlb_start + (index << IO_TLB_SHIFT); |
| 425 | |
| 426 | /* |
| 427 | * Update the indices to avoid searching in the next |
| 428 | * round. |
| 429 | */ |
| 430 | io_tlb_index = ((index + nslots) < io_tlb_nslabs |
| 431 | ? (index + nslots) : 0); |
| 432 | |
| 433 | goto found; |
| 434 | } |
| 435 | index += stride; |
| 436 | if (index >= io_tlb_nslabs) |
| 437 | index = 0; |
| 438 | } while (index != wrap); |
| 439 | |
| 440 | not_found: |
| 441 | spin_unlock_irqrestore(&io_tlb_lock, flags); |
| 442 | return NULL; |
| 443 | found: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | spin_unlock_irqrestore(&io_tlb_lock, flags); |
| 445 | |
| 446 | /* |
| 447 | * Save away the mapping from the original address to the DMA address. |
| 448 | * This is needed when we sync the memory. Then we sync the buffer if |
| 449 | * needed. |
| 450 | */ |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 451 | for (i = 0; i < nslots; i++) |
| 452 | io_tlb_orig_addr[index+i] = phys + (i << IO_TLB_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 454 | swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
| 456 | return dma_addr; |
| 457 | } |
| 458 | |
| 459 | /* |
| 460 | * dma_addr is the kernel virtual address of the bounce buffer to unmap. |
| 461 | */ |
| 462 | static void |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 463 | do_unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | { |
| 465 | unsigned long flags; |
| 466 | int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; |
| 467 | int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT; |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 468 | phys_addr_t phys = io_tlb_orig_addr[index]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
| 470 | /* |
| 471 | * First, sync the memory before unmapping the entry |
| 472 | */ |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 473 | if (phys && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL))) |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 474 | swiotlb_bounce(phys, dma_addr, size, DMA_FROM_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
| 476 | /* |
| 477 | * Return the buffer to the free list by setting the corresponding |
| 478 | * entries to indicate the number of contigous entries available. |
| 479 | * While returning the entries to the free list, we merge the entries |
| 480 | * with slots below and above the pool being returned. |
| 481 | */ |
| 482 | spin_lock_irqsave(&io_tlb_lock, flags); |
| 483 | { |
| 484 | count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ? |
| 485 | io_tlb_list[index + nslots] : 0); |
| 486 | /* |
| 487 | * Step 1: return the slots to the free list, merging the |
| 488 | * slots with superceeding slots |
| 489 | */ |
| 490 | for (i = index + nslots - 1; i >= index; i--) |
| 491 | io_tlb_list[i] = ++count; |
| 492 | /* |
| 493 | * Step 2: merge the returned slots with the preceding slots, |
| 494 | * if available (non zero) |
| 495 | */ |
| 496 | for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--) |
| 497 | io_tlb_list[i] = ++count; |
| 498 | } |
| 499 | spin_unlock_irqrestore(&io_tlb_lock, flags); |
| 500 | } |
| 501 | |
| 502 | static void |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 503 | sync_single(struct device *hwdev, char *dma_addr, size_t size, |
| 504 | int dir, int target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | { |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 506 | int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT; |
| 507 | phys_addr_t phys = io_tlb_orig_addr[index]; |
| 508 | |
| 509 | phys += ((unsigned long)dma_addr & ((1 << IO_TLB_SHIFT) - 1)); |
Keir Fraser | df336d1 | 2007-07-21 04:37:24 -0700 | [diff] [blame] | 510 | |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 511 | switch (target) { |
| 512 | case SYNC_FOR_CPU: |
| 513 | if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)) |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 514 | swiotlb_bounce(phys, dma_addr, size, DMA_FROM_DEVICE); |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 515 | else |
| 516 | BUG_ON(dir != DMA_TO_DEVICE); |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 517 | break; |
| 518 | case SYNC_FOR_DEVICE: |
| 519 | if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)) |
Becky Bruce | fb05a37 | 2008-12-22 10:26:09 -0800 | [diff] [blame] | 520 | swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE); |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 521 | else |
| 522 | BUG_ON(dir != DMA_FROM_DEVICE); |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 523 | break; |
| 524 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | BUG(); |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 526 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | } |
| 528 | |
| 529 | void * |
| 530 | swiotlb_alloc_coherent(struct device *hwdev, size_t size, |
Al Viro | 06a5449 | 2005-10-21 03:21:03 -0400 | [diff] [blame] | 531 | dma_addr_t *dma_handle, gfp_t flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | { |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 533 | dma_addr_t dev_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | void *ret; |
| 535 | int order = get_order(size); |
Yang Hongyang | 284901a | 2009-04-06 19:01:15 -0700 | [diff] [blame] | 536 | u64 dma_mask = DMA_BIT_MASK(32); |
FUJITA Tomonori | 1e74f30 | 2008-11-17 16:24:34 +0900 | [diff] [blame] | 537 | |
| 538 | if (hwdev && hwdev->coherent_dma_mask) |
| 539 | dma_mask = hwdev->coherent_dma_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | |
Tony Luck | 25667d6 | 2007-03-06 13:31:45 -0800 | [diff] [blame] | 541 | ret = (void *)__get_free_pages(flags, order); |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 542 | if (ret && |
| 543 | !is_buffer_dma_capable(dma_mask, swiotlb_virt_to_bus(hwdev, ret), |
| 544 | size)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | /* |
| 546 | * The allocated memory isn't reachable by the device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | */ |
| 548 | free_pages((unsigned long) ret, order); |
| 549 | ret = NULL; |
| 550 | } |
| 551 | if (!ret) { |
| 552 | /* |
| 553 | * We are either out of memory or the device can't DMA |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 554 | * to GFP_DMA memory; fall back on map_single(), which |
| 555 | * will grab memory from the lowest available address range. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | */ |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 557 | ret = map_single(hwdev, 0, size, DMA_FROM_DEVICE); |
FUJITA Tomonori | 9dfda12 | 2008-09-08 18:53:48 +0900 | [diff] [blame] | 558 | if (!ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | memset(ret, 0, size); |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 563 | dev_addr = swiotlb_virt_to_bus(hwdev, ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | |
| 565 | /* Confirm address can be DMA'd by device */ |
FUJITA Tomonori | 1e74f30 | 2008-11-17 16:24:34 +0900 | [diff] [blame] | 566 | if (!is_buffer_dma_capable(dma_mask, dev_addr, size)) { |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 567 | printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n", |
FUJITA Tomonori | 1e74f30 | 2008-11-17 16:24:34 +0900 | [diff] [blame] | 568 | (unsigned long long)dma_mask, |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 569 | (unsigned long long)dev_addr); |
FUJITA Tomonori | a2b89b5 | 2008-10-23 18:42:03 +0900 | [diff] [blame] | 570 | |
| 571 | /* DMA_TO_DEVICE to avoid memcpy in unmap_single */ |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 572 | do_unmap_single(hwdev, ret, size, DMA_TO_DEVICE); |
FUJITA Tomonori | a2b89b5 | 2008-10-23 18:42:03 +0900 | [diff] [blame] | 573 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | } |
| 575 | *dma_handle = dev_addr; |
| 576 | return ret; |
| 577 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 578 | EXPORT_SYMBOL(swiotlb_alloc_coherent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
| 580 | void |
| 581 | swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame^] | 582 | dma_addr_t dev_addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | { |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame^] | 584 | phys_addr_t paddr = swiotlb_bus_to_phys(hwdev, dev_addr); |
| 585 | |
David Brownell | aa24886 | 2007-08-10 13:10:27 -0700 | [diff] [blame] | 586 | WARN_ON(irqs_disabled()); |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame^] | 587 | if (!is_swiotlb_buffer(paddr)) |
| 588 | free_pages((unsigned long)vaddr, get_order(size)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | else |
| 590 | /* DMA_TO_DEVICE to avoid memcpy in unmap_single */ |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 591 | do_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 593 | EXPORT_SYMBOL(swiotlb_free_coherent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | |
| 595 | static void |
| 596 | swiotlb_full(struct device *dev, size_t size, int dir, int do_panic) |
| 597 | { |
| 598 | /* |
| 599 | * Ran out of IOMMU space for this operation. This is very bad. |
| 600 | * Unfortunately the drivers cannot handle this operation properly. |
Tony Luck | 17e5ad6 | 2005-09-29 15:52:13 -0700 | [diff] [blame] | 601 | * unless they check for dma_mapping_error (most don't) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | * When the mapping is small enough return a static buffer to limit |
| 603 | * the damage, or panic when the transfer is too big. |
| 604 | */ |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 605 | 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] | 606 | "device %s\n", size, dev ? dev_name(dev) : "?"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
| 608 | if (size > io_tlb_overflow && do_panic) { |
Tony Luck | 17e5ad6 | 2005-09-29 15:52:13 -0700 | [diff] [blame] | 609 | if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) |
| 610 | panic("DMA: Memory would be corrupted\n"); |
| 611 | if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) |
| 612 | panic("DMA: Random memory would be DMAed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | } |
| 614 | } |
| 615 | |
| 616 | /* |
| 617 | * 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] | 618 | * physical address to use is returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | * |
| 620 | * 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] | 621 | * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | */ |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 623 | dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, |
| 624 | unsigned long offset, size_t size, |
| 625 | enum dma_data_direction dir, |
| 626 | struct dma_attrs *attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | { |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 628 | phys_addr_t phys = page_to_phys(page) + offset; |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 629 | dma_addr_t dev_addr = swiotlb_phys_to_bus(dev, phys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | void *map; |
| 631 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 632 | BUG_ON(dir == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | /* |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 634 | * If the address happens to be in the device's DMA window, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | * we can safely return the device addr and not worry about bounce |
| 636 | * buffering it. |
| 637 | */ |
FUJITA Tomonori | cf56e3f | 2009-07-10 10:04:52 +0900 | [diff] [blame] | 638 | if (!address_needs_mapping(dev, dev_addr, size) && !swiotlb_force) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | return dev_addr; |
| 640 | |
| 641 | /* |
| 642 | * Oh well, have to allocate and map a bounce buffer. |
| 643 | */ |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 644 | map = map_single(dev, phys, size, dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | if (!map) { |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 646 | swiotlb_full(dev, size, dir, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | map = io_tlb_overflow_buffer; |
| 648 | } |
| 649 | |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 650 | dev_addr = swiotlb_virt_to_bus(dev, map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | |
| 652 | /* |
| 653 | * Ensure that the address returned is DMA'ble |
| 654 | */ |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 655 | if (address_needs_mapping(dev, dev_addr, size)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | panic("map_single: bounce buffer is not DMA'ble"); |
| 657 | |
| 658 | return dev_addr; |
| 659 | } |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 660 | EXPORT_SYMBOL_GPL(swiotlb_map_page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | |
| 662 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | * 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] | 664 | * 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] | 665 | * other usages are undefined. |
| 666 | * |
| 667 | * After this call, reads by the cpu to the buffer are guaranteed to see |
| 668 | * whatever the device wrote there. |
| 669 | */ |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 670 | static void unmap_single(struct device *hwdev, dma_addr_t dev_addr, |
| 671 | size_t size, int dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | { |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame^] | 673 | phys_addr_t paddr = swiotlb_bus_to_phys(hwdev, dev_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 675 | BUG_ON(dir == DMA_NONE); |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 676 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame^] | 677 | if (is_swiotlb_buffer(paddr)) { |
| 678 | do_unmap_single(hwdev, phys_to_virt(paddr), size, dir); |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 679 | return; |
| 680 | } |
| 681 | |
| 682 | if (dir != DMA_FROM_DEVICE) |
| 683 | return; |
| 684 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame^] | 685 | /* |
| 686 | * phys_to_virt doesn't work with hihgmem page but we could |
| 687 | * call dma_mark_clean() with hihgmem page here. However, we |
| 688 | * are fine since dma_mark_clean() is null on POWERPC. We can |
| 689 | * make dma_mark_clean() take a physical address if necessary. |
| 690 | */ |
| 691 | dma_mark_clean(phys_to_virt(paddr), size); |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 692 | } |
| 693 | |
| 694 | void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, |
| 695 | size_t size, enum dma_data_direction dir, |
| 696 | struct dma_attrs *attrs) |
| 697 | { |
| 698 | unmap_single(hwdev, dev_addr, size, dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | } |
FUJITA Tomonori | f98eee8 | 2009-01-05 23:59:03 +0900 | [diff] [blame] | 700 | EXPORT_SYMBOL_GPL(swiotlb_unmap_page); |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 701 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | /* |
| 703 | * Make physical memory consistent for a single streaming mode DMA translation |
| 704 | * after a transfer. |
| 705 | * |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 706 | * 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] | 707 | * using the cpu, yet do not wish to teardown the dma mapping, you must |
| 708 | * 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] | 709 | * address back to the card, you must first perform a |
| 710 | * swiotlb_dma_sync_for_device, and then the device again owns the buffer |
| 711 | */ |
Andrew Morton | be6b026 | 2007-02-12 00:52:17 -0800 | [diff] [blame] | 712 | static void |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 713 | swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr, |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 714 | size_t size, int dir, int target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | { |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame^] | 716 | phys_addr_t paddr = swiotlb_bus_to_phys(hwdev, dev_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 718 | BUG_ON(dir == DMA_NONE); |
Becky Bruce | 380d687 | 2009-04-08 09:09:20 -0500 | [diff] [blame] | 719 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame^] | 720 | if (is_swiotlb_buffer(paddr)) { |
| 721 | sync_single(hwdev, phys_to_virt(paddr), size, dir, target); |
Becky Bruce | 380d687 | 2009-04-08 09:09:20 -0500 | [diff] [blame] | 722 | return; |
| 723 | } |
| 724 | |
| 725 | if (dir != DMA_FROM_DEVICE) |
| 726 | return; |
| 727 | |
FUJITA Tomonori | 02ca646 | 2009-07-23 11:18:49 +0900 | [diff] [blame^] | 728 | dma_mark_clean(phys_to_virt(paddr), size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | } |
| 730 | |
| 731 | void |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 732 | 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] | 733 | size_t size, enum dma_data_direction dir) |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 734 | { |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 735 | swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU); |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 736 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 737 | EXPORT_SYMBOL(swiotlb_sync_single_for_cpu); |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 738 | |
| 739 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | 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] | 741 | size_t size, enum dma_data_direction dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | { |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 743 | swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 745 | EXPORT_SYMBOL(swiotlb_sync_single_for_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | |
| 747 | /* |
John W. Linville | 878a97c | 2005-09-29 14:44:23 -0700 | [diff] [blame] | 748 | * Same as above, but for a sub-range of the mapping. |
| 749 | */ |
Andrew Morton | be6b026 | 2007-02-12 00:52:17 -0800 | [diff] [blame] | 750 | static void |
John W. Linville | 878a97c | 2005-09-29 14:44:23 -0700 | [diff] [blame] | 751 | swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr, |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 752 | unsigned long offset, size_t size, |
| 753 | int dir, int target) |
John W. Linville | 878a97c | 2005-09-29 14:44:23 -0700 | [diff] [blame] | 754 | { |
Becky Bruce | 380d687 | 2009-04-08 09:09:20 -0500 | [diff] [blame] | 755 | swiotlb_sync_single(hwdev, dev_addr + offset, size, dir, target); |
John W. Linville | 878a97c | 2005-09-29 14:44:23 -0700 | [diff] [blame] | 756 | } |
| 757 | |
| 758 | void |
| 759 | swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 760 | unsigned long offset, size_t size, |
| 761 | enum dma_data_direction dir) |
John W. Linville | 878a97c | 2005-09-29 14:44:23 -0700 | [diff] [blame] | 762 | { |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 763 | swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir, |
| 764 | SYNC_FOR_CPU); |
John W. Linville | 878a97c | 2005-09-29 14:44:23 -0700 | [diff] [blame] | 765 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 766 | EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu); |
John W. Linville | 878a97c | 2005-09-29 14:44:23 -0700 | [diff] [blame] | 767 | |
| 768 | void |
| 769 | swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 770 | unsigned long offset, size_t size, |
| 771 | enum dma_data_direction dir) |
John W. Linville | 878a97c | 2005-09-29 14:44:23 -0700 | [diff] [blame] | 772 | { |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 773 | swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir, |
| 774 | SYNC_FOR_DEVICE); |
John W. Linville | 878a97c | 2005-09-29 14:44:23 -0700 | [diff] [blame] | 775 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 776 | EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device); |
John W. Linville | 878a97c | 2005-09-29 14:44:23 -0700 | [diff] [blame] | 777 | |
| 778 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | * 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] | 780 | * This is the scatter-gather version of the above swiotlb_map_page |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | * interface. Here the scatter gather list elements are each tagged with the |
| 782 | * appropriate dma address and length. They are obtained via |
| 783 | * sg_dma_{address,length}(SG). |
| 784 | * |
| 785 | * NOTE: An implementation may be able to use a smaller number of |
| 786 | * DMA address/length pairs than there are SG table elements. |
| 787 | * (for example via virtual mapping capabilities) |
| 788 | * The routine returns the number of addr/length pairs actually |
| 789 | * used, at most nents. |
| 790 | * |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 791 | * Device ownership issues as mentioned above for swiotlb_map_page are the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | * same here. |
| 793 | */ |
| 794 | int |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 795 | swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 796 | enum dma_data_direction dir, struct dma_attrs *attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | { |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 798 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | int i; |
| 800 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 801 | BUG_ON(dir == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 803 | for_each_sg(sgl, sg, nelems, i) { |
Ian Campbell | 961d7d0 | 2009-01-09 18:32:10 +0000 | [diff] [blame] | 804 | phys_addr_t paddr = sg_phys(sg); |
| 805 | dma_addr_t dev_addr = swiotlb_phys_to_bus(hwdev, paddr); |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 806 | |
FUJITA Tomonori | cf56e3f | 2009-07-10 10:04:52 +0900 | [diff] [blame] | 807 | if (swiotlb_force || |
FUJITA Tomonori | 2797982 | 2008-09-10 01:06:49 +0900 | [diff] [blame] | 808 | address_needs_mapping(hwdev, dev_addr, sg->length)) { |
Becky Bruce | bc40ac6 | 2008-12-22 10:26:08 -0800 | [diff] [blame] | 809 | void *map = map_single(hwdev, sg_phys(sg), |
| 810 | sg->length, dir); |
Andi Kleen | 7e87023 | 2005-12-20 14:45:19 +0100 | [diff] [blame] | 811 | if (!map) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | /* Don't panic here, we expect map_sg users |
| 813 | to do proper error handling. */ |
| 814 | swiotlb_full(hwdev, sg->length, dir, 0); |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 815 | swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir, |
| 816 | attrs); |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 817 | sgl[0].dma_length = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | return 0; |
| 819 | } |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 820 | sg->dma_address = swiotlb_virt_to_bus(hwdev, map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | } else |
| 822 | sg->dma_address = dev_addr; |
| 823 | sg->dma_length = sg->length; |
| 824 | } |
| 825 | return nelems; |
| 826 | } |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 827 | EXPORT_SYMBOL(swiotlb_map_sg_attrs); |
| 828 | |
| 829 | int |
| 830 | swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems, |
| 831 | int dir) |
| 832 | { |
| 833 | return swiotlb_map_sg_attrs(hwdev, sgl, nelems, dir, NULL); |
| 834 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 835 | EXPORT_SYMBOL(swiotlb_map_sg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
| 837 | /* |
| 838 | * Unmap a set of streaming mode DMA translations. Again, cpu read rules |
Becky Bruce | ceb5ac3 | 2009-04-08 09:09:15 -0500 | [diff] [blame] | 839 | * concerning calls here are the same as for swiotlb_unmap_page() above. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | */ |
| 841 | void |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 842 | swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 843 | int nelems, enum dma_data_direction dir, struct dma_attrs *attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | { |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 845 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | int i; |
| 847 | |
Eric Sesterhenn | 3481454 | 2006-03-24 18:47:11 +0100 | [diff] [blame] | 848 | BUG_ON(dir == DMA_NONE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | |
Becky Bruce | 7fcebbd | 2009-04-08 09:09:19 -0500 | [diff] [blame] | 850 | for_each_sg(sgl, sg, nelems, i) |
| 851 | unmap_single(hwdev, sg->dma_address, sg->dma_length, dir); |
| 852 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | } |
Arthur Kepner | 309df0c | 2008-04-29 01:00:32 -0700 | [diff] [blame] | 854 | EXPORT_SYMBOL(swiotlb_unmap_sg_attrs); |
| 855 | |
| 856 | void |
| 857 | swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems, |
| 858 | int dir) |
| 859 | { |
| 860 | return swiotlb_unmap_sg_attrs(hwdev, sgl, nelems, dir, NULL); |
| 861 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 862 | EXPORT_SYMBOL(swiotlb_unmap_sg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
| 864 | /* |
| 865 | * Make physical memory consistent for a set of streaming mode DMA translations |
| 866 | * after a transfer. |
| 867 | * |
| 868 | * The same as swiotlb_sync_single_* but for a scatter-gather list, same rules |
| 869 | * and usage. |
| 870 | */ |
Andrew Morton | be6b026 | 2007-02-12 00:52:17 -0800 | [diff] [blame] | 871 | static void |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 872 | swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl, |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 873 | int nelems, int dir, int target) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | { |
Jens Axboe | dbfd49f | 2007-05-11 14:56:18 +0200 | [diff] [blame] | 875 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | int i; |
| 877 | |
Becky Bruce | 380d687 | 2009-04-08 09:09:20 -0500 | [diff] [blame] | 878 | for_each_sg(sgl, sg, nelems, i) |
| 879 | swiotlb_sync_single(hwdev, sg->dma_address, |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 880 | sg->dma_length, dir, target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | } |
| 882 | |
| 883 | void |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 884 | swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 885 | int nelems, enum dma_data_direction dir) |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 886 | { |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 887 | swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU); |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 888 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 889 | EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu); |
John W. Linville | 8270f3f | 2005-09-29 14:43:32 -0700 | [diff] [blame] | 890 | |
| 891 | void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, |
FUJITA Tomonori | 160c1d8 | 2009-01-05 23:59:02 +0900 | [diff] [blame] | 893 | int nelems, enum dma_data_direction dir) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | { |
John W. Linville | de69e0f | 2005-09-29 14:44:57 -0700 | [diff] [blame] | 895 | swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 897 | EXPORT_SYMBOL(swiotlb_sync_sg_for_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | |
| 899 | int |
FUJITA Tomonori | 8d8bb39 | 2008-07-25 19:44:49 -0700 | [diff] [blame] | 900 | swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | { |
Jeremy Fitzhardinge | 70a7d3c | 2008-12-22 10:26:05 -0800 | [diff] [blame] | 902 | return (dma_addr == swiotlb_virt_to_bus(hwdev, io_tlb_overflow_buffer)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | } |
FUJITA Tomonori | 874d6a9 | 2008-12-28 15:02:07 +0900 | [diff] [blame] | 904 | EXPORT_SYMBOL(swiotlb_dma_mapping_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | |
| 906 | /* |
Tony Luck | 17e5ad6 | 2005-09-29 15:52:13 -0700 | [diff] [blame] | 907 | * Return whether the given device DMA address mask can be supported |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | * 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] | 909 | * during bus mastering, then you would pass 0x00ffffff as the mask to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | * this function. |
| 911 | */ |
| 912 | int |
Jan Beulich | 563aaf0 | 2007-02-05 18:51:25 -0800 | [diff] [blame] | 913 | swiotlb_dma_supported(struct device *hwdev, u64 mask) |
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 swiotlb_virt_to_bus(hwdev, io_tlb_end - 1) <= mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | EXPORT_SYMBOL(swiotlb_dma_supported); |