Blame view
lib/swiotlb.c
24.5 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 |
/* * Dynamic DMA mapping support. * |
563aaf064 [IA64] swiotlb cl... |
4 |
* This implementation is a fallback for platforms that do not support |
1da177e4c Linux-2.6.12-rc2 |
5 6 7 8 9 10 11 12 13 |
* I/O TLBs (aka DMA address translation hardware). * Copyright (C) 2000 Asit Mallick <Asit.K.Mallick@intel.com> * Copyright (C) 2000 Goutham Rao <goutham.rao@intel.com> * Copyright (C) 2000, 2003 Hewlett-Packard Co * David Mosberger-Tang <davidm@hpl.hp.com> * * 03/05/07 davidm Switch from PCI-DMA to generic device DMA API. * 00/12/13 davidm Rename to swiotlb.c and add mark_clean() to avoid * unnecessary i-cache flushing. |
569c8bf5d [PATCH] swiotlb: ... |
14 15 16 |
* 04/07/.. ak Better overflow handling. Assorted fixes. * 05/09/10 linville Add support for syncing ranges, support syncing for * DMA_BIDIRECTIONAL mappings, miscellaneous cleanup. |
fb05a3792 swiotlb: add supp... |
17 |
* 08/12/11 beckyb Add highmem support |
1da177e4c Linux-2.6.12-rc2 |
18 19 20 |
*/ #include <linux/cache.h> |
17e5ad6c0 [PATCH] Removed r... |
21 |
#include <linux/dma-mapping.h> |
1da177e4c Linux-2.6.12-rc2 |
22 23 |
#include <linux/mm.h> #include <linux/module.h> |
1da177e4c Linux-2.6.12-rc2 |
24 25 |
#include <linux/spinlock.h> #include <linux/string.h> |
0016fdee9 swiotlb: move som... |
26 |
#include <linux/swiotlb.h> |
fb05a3792 swiotlb: add supp... |
27 |
#include <linux/pfn.h> |
1da177e4c Linux-2.6.12-rc2 |
28 29 |
#include <linux/types.h> #include <linux/ctype.h> |
ef9b18935 swiotlb: support ... |
30 |
#include <linux/highmem.h> |
1da177e4c Linux-2.6.12-rc2 |
31 32 |
#include <asm/io.h> |
1da177e4c Linux-2.6.12-rc2 |
33 |
#include <asm/dma.h> |
17e5ad6c0 [PATCH] Removed r... |
34 |
#include <asm/scatterlist.h> |
1da177e4c Linux-2.6.12-rc2 |
35 36 37 |
#include <linux/init.h> #include <linux/bootmem.h> |
a85225092 swiotlb: use iomm... |
38 |
#include <linux/iommu-helper.h> |
1da177e4c Linux-2.6.12-rc2 |
39 40 41 |
#define OFFSET(val,align) ((unsigned long) \ ( (val) & ( (align) - 1))) |
0b9afede3 [IA64] more robus... |
42 43 44 45 46 47 48 49 |
#define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT)) /* * Minimum IO TLB size to bother booting with. Systems with mainly * 64bit capable cards will only lightly use the swiotlb. If we can't * allocate a contiguous 1MB, we're probably in trouble anyway. */ #define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT) |
de69e0f0b [PATCH] swiotlb: ... |
50 51 52 53 54 55 56 |
/* * Enumeration for sync targets */ enum dma_sync_target { SYNC_FOR_CPU = 0, SYNC_FOR_DEVICE = 1, }; |
1da177e4c Linux-2.6.12-rc2 |
57 58 59 |
int swiotlb_force; /* |
ceb5ac326 swiotlb: comment ... |
60 61 |
* Used to do a quick range check in unmap_single and * sync_single_*, to see if the memory was in fact allocated by this |
1da177e4c Linux-2.6.12-rc2 |
62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 |
* API. */ static char *io_tlb_start, *io_tlb_end; /* * The number of IO TLB blocks (in groups of 64) betweeen io_tlb_start and * io_tlb_end. This is command line adjustable via setup_io_tlb_npages. */ static unsigned long io_tlb_nslabs; /* * When the IOMMU overflows we return a fallback buffer. This sets the size. */ static unsigned long io_tlb_overflow = 32*1024; void *io_tlb_overflow_buffer; /* * This is a free list describing the number of free entries available from * each index */ static unsigned int *io_tlb_list; static unsigned int io_tlb_index; /* * We need to save away the original address corresponding to a mapped entry * for the sync operations. */ |
bc40ac669 swiotlb: store ph... |
90 |
static phys_addr_t *io_tlb_orig_addr; |
1da177e4c Linux-2.6.12-rc2 |
91 92 93 94 95 96 97 98 99 100 |
/* * Protect the above data structures in the map and unmap calls */ static DEFINE_SPINLOCK(io_tlb_lock); static int __init setup_io_tlb_npages(char *str) { if (isdigit(*str)) { |
e8579e72c [IA64, X86_64] fi... |
101 |
io_tlb_nslabs = simple_strtoul(str, &str, 0); |
1da177e4c Linux-2.6.12-rc2 |
102 103 104 105 106 107 108 109 110 111 112 |
/* avoid tail segment of size < IO_TLB_SEGSIZE */ io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); } if (*str == ',') ++str; if (!strcmp(str, "force")) swiotlb_force = 1; return 1; } __setup("swiotlb=", setup_io_tlb_npages); /* make io_tlb_overflow tunable too? */ |
02ca646e7 swiotlb: remove u... |
113 |
/* Note that this doesn't work with highmem page */ |
70a7d3cc1 swiotlb: add hwde... |
114 115 |
static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev, volatile void *address) |
e08e1f7ad swiotlb: allow ar... |
116 |
{ |
862d196b2 swiotlb: use phys... |
117 |
return phys_to_dma(hwdev, virt_to_phys(address)); |
e08e1f7ad swiotlb: allow ar... |
118 |
} |
2e5b2b86b swiotlb: consolid... |
119 120 121 |
static void swiotlb_print_info(unsigned long bytes) { phys_addr_t pstart, pend; |
2e5b2b86b swiotlb: consolid... |
122 123 124 |
pstart = virt_to_phys(io_tlb_start); pend = virt_to_phys(io_tlb_end); |
2e5b2b86b swiotlb: consolid... |
125 126 127 |
printk(KERN_INFO "Placing %luMB software IO TLB between %p - %p ", bytes >> 20, io_tlb_start, io_tlb_end); |
70a7d3cc1 swiotlb: add hwde... |
128 129 130 131 |
printk(KERN_INFO "software IO TLB at phys %#llx - %#llx ", (unsigned long long)pstart, (unsigned long long)pend); |
2e5b2b86b swiotlb: consolid... |
132 |
} |
1da177e4c Linux-2.6.12-rc2 |
133 134 |
/* * Statically reserve bounce buffer space and initialize bounce buffer data |
17e5ad6c0 [PATCH] Removed r... |
135 |
* structures for the software IO TLB used to implement the DMA API. |
1da177e4c Linux-2.6.12-rc2 |
136 |
*/ |
563aaf064 [IA64] swiotlb cl... |
137 138 |
void __init swiotlb_init_with_default_size(size_t default_size) |
1da177e4c Linux-2.6.12-rc2 |
139 |
{ |
563aaf064 [IA64] swiotlb cl... |
140 |
unsigned long i, bytes; |
1da177e4c Linux-2.6.12-rc2 |
141 142 |
if (!io_tlb_nslabs) { |
e8579e72c [IA64, X86_64] fi... |
143 |
io_tlb_nslabs = (default_size >> IO_TLB_SHIFT); |
1da177e4c Linux-2.6.12-rc2 |
144 145 |
io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); } |
563aaf064 [IA64] swiotlb cl... |
146 |
bytes = io_tlb_nslabs << IO_TLB_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
147 148 149 |
/* * Get IO TLB memory from the low pages */ |
3885123da swiotlb: remove u... |
150 |
io_tlb_start = alloc_bootmem_low_pages(bytes); |
1da177e4c Linux-2.6.12-rc2 |
151 152 |
if (!io_tlb_start) panic("Cannot allocate SWIOTLB buffer"); |
563aaf064 [IA64] swiotlb cl... |
153 |
io_tlb_end = io_tlb_start + bytes; |
1da177e4c Linux-2.6.12-rc2 |
154 155 156 157 158 159 160 |
/* * Allocate and initialize the free list array. This array is used * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE * between io_tlb_start and io_tlb_end. */ io_tlb_list = alloc_bootmem(io_tlb_nslabs * sizeof(int)); |
25667d675 Revert "[IA64] sw... |
161 |
for (i = 0; i < io_tlb_nslabs; i++) |
1da177e4c Linux-2.6.12-rc2 |
162 163 |
io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE); io_tlb_index = 0; |
bc40ac669 swiotlb: store ph... |
164 |
io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(phys_addr_t)); |
1da177e4c Linux-2.6.12-rc2 |
165 166 167 168 169 |
/* * Get the overflow emergency buffer */ io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow); |
563aaf064 [IA64] swiotlb cl... |
170 171 172 |
if (!io_tlb_overflow_buffer) panic("Cannot allocate SWIOTLB overflow buffer! "); |
2e5b2b86b swiotlb: consolid... |
173 |
swiotlb_print_info(bytes); |
1da177e4c Linux-2.6.12-rc2 |
174 |
} |
563aaf064 [IA64] swiotlb cl... |
175 176 |
void __init swiotlb_init(void) |
1da177e4c Linux-2.6.12-rc2 |
177 |
{ |
25667d675 Revert "[IA64] sw... |
178 |
swiotlb_init_with_default_size(64 * (1<<20)); /* default to 64MB */ |
1da177e4c Linux-2.6.12-rc2 |
179 |
} |
0b9afede3 [IA64] more robus... |
180 181 182 183 184 185 |
/* * Systems with larger DMA zones (those that don't support ISA) can * initialize the swiotlb later using the slab allocator if needed. * This should be just like above, but with some error catching. */ int |
563aaf064 [IA64] swiotlb cl... |
186 |
swiotlb_late_init_with_default_size(size_t default_size) |
0b9afede3 [IA64] more robus... |
187 |
{ |
563aaf064 [IA64] swiotlb cl... |
188 |
unsigned long i, bytes, req_nslabs = io_tlb_nslabs; |
0b9afede3 [IA64] more robus... |
189 190 191 192 193 194 195 196 197 198 |
unsigned int order; if (!io_tlb_nslabs) { io_tlb_nslabs = (default_size >> IO_TLB_SHIFT); io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); } /* * Get IO TLB memory from the low pages */ |
563aaf064 [IA64] swiotlb cl... |
199 |
order = get_order(io_tlb_nslabs << IO_TLB_SHIFT); |
0b9afede3 [IA64] more robus... |
200 |
io_tlb_nslabs = SLABS_PER_PAGE << order; |
563aaf064 [IA64] swiotlb cl... |
201 |
bytes = io_tlb_nslabs << IO_TLB_SHIFT; |
0b9afede3 [IA64] more robus... |
202 203 |
while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) { |
bb52196be swiotlb: remove u... |
204 205 |
io_tlb_start = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, order); |
0b9afede3 [IA64] more robus... |
206 207 208 209 210 211 212 |
if (io_tlb_start) break; order--; } if (!io_tlb_start) goto cleanup1; |
563aaf064 [IA64] swiotlb cl... |
213 |
if (order != get_order(bytes)) { |
0b9afede3 [IA64] more robus... |
214 215 216 217 |
printk(KERN_WARNING "Warning: only able to allocate %ld MB " "for software IO TLB ", (PAGE_SIZE << order) >> 20); io_tlb_nslabs = SLABS_PER_PAGE << order; |
563aaf064 [IA64] swiotlb cl... |
218 |
bytes = io_tlb_nslabs << IO_TLB_SHIFT; |
0b9afede3 [IA64] more robus... |
219 |
} |
563aaf064 [IA64] swiotlb cl... |
220 221 |
io_tlb_end = io_tlb_start + bytes; memset(io_tlb_start, 0, bytes); |
0b9afede3 [IA64] more robus... |
222 223 224 225 226 227 228 229 230 231 232 233 234 235 |
/* * Allocate and initialize the free list array. This array is used * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE * between io_tlb_start and io_tlb_end. */ io_tlb_list = (unsigned int *)__get_free_pages(GFP_KERNEL, get_order(io_tlb_nslabs * sizeof(int))); if (!io_tlb_list) goto cleanup2; for (i = 0; i < io_tlb_nslabs; i++) io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE); io_tlb_index = 0; |
bc40ac669 swiotlb: store ph... |
236 237 238 239 |
io_tlb_orig_addr = (phys_addr_t *) __get_free_pages(GFP_KERNEL, get_order(io_tlb_nslabs * sizeof(phys_addr_t))); |
0b9afede3 [IA64] more robus... |
240 241 |
if (!io_tlb_orig_addr) goto cleanup3; |
bc40ac669 swiotlb: store ph... |
242 |
memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(phys_addr_t)); |
0b9afede3 [IA64] more robus... |
243 244 245 246 247 248 249 250 |
/* * Get the overflow emergency buffer */ io_tlb_overflow_buffer = (void *)__get_free_pages(GFP_DMA, get_order(io_tlb_overflow)); if (!io_tlb_overflow_buffer) goto cleanup4; |
2e5b2b86b swiotlb: consolid... |
251 |
swiotlb_print_info(bytes); |
0b9afede3 [IA64] more robus... |
252 253 254 255 |
return 0; cleanup4: |
bc40ac669 swiotlb: store ph... |
256 257 |
free_pages((unsigned long)io_tlb_orig_addr, get_order(io_tlb_nslabs * sizeof(phys_addr_t))); |
0b9afede3 [IA64] more robus... |
258 259 |
io_tlb_orig_addr = NULL; cleanup3: |
25667d675 Revert "[IA64] sw... |
260 261 |
free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs * sizeof(int))); |
0b9afede3 [IA64] more robus... |
262 |
io_tlb_list = NULL; |
0b9afede3 [IA64] more robus... |
263 |
cleanup2: |
563aaf064 [IA64] swiotlb cl... |
264 |
io_tlb_end = NULL; |
0b9afede3 [IA64] more robus... |
265 266 267 268 269 270 |
free_pages((unsigned long)io_tlb_start, order); io_tlb_start = NULL; cleanup1: io_tlb_nslabs = req_nslabs; return -ENOMEM; } |
02ca646e7 swiotlb: remove u... |
271 |
static int is_swiotlb_buffer(phys_addr_t paddr) |
640aebfe0 swiotlb: add is_s... |
272 |
{ |
02ca646e7 swiotlb: remove u... |
273 274 |
return paddr >= virt_to_phys(io_tlb_start) && paddr < virt_to_phys(io_tlb_end); |
640aebfe0 swiotlb: add is_s... |
275 |
} |
1da177e4c Linux-2.6.12-rc2 |
276 |
/* |
fb05a3792 swiotlb: add supp... |
277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 |
* Bounce: copy the swiotlb buffer back to the original dma location */ static void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size, enum dma_data_direction dir) { unsigned long pfn = PFN_DOWN(phys); if (PageHighMem(pfn_to_page(pfn))) { /* The buffer does not have a mapping. Map it in and copy */ unsigned int offset = phys & ~PAGE_MASK; char *buffer; unsigned int sz = 0; unsigned long flags; while (size) { |
67131ad05 swiotlb: fix comp... |
292 |
sz = min_t(size_t, PAGE_SIZE - offset, size); |
fb05a3792 swiotlb: add supp... |
293 294 295 296 297 298 |
local_irq_save(flags); buffer = kmap_atomic(pfn_to_page(pfn), KM_BOUNCE_READ); if (dir == DMA_TO_DEVICE) memcpy(dma_addr, buffer + offset, sz); |
ef9b18935 swiotlb: support ... |
299 |
else |
fb05a3792 swiotlb: add supp... |
300 301 |
memcpy(buffer + offset, dma_addr, sz); kunmap_atomic(buffer, KM_BOUNCE_READ); |
ef9b18935 swiotlb: support ... |
302 |
local_irq_restore(flags); |
fb05a3792 swiotlb: add supp... |
303 304 305 306 307 |
size -= sz; pfn++; dma_addr += sz; offset = 0; |
ef9b18935 swiotlb: support ... |
308 309 |
} } else { |
ef9b18935 swiotlb: support ... |
310 |
if (dir == DMA_TO_DEVICE) |
fb05a3792 swiotlb: add supp... |
311 |
memcpy(dma_addr, phys_to_virt(phys), size); |
ef9b18935 swiotlb: support ... |
312 |
else |
fb05a3792 swiotlb: add supp... |
313 |
memcpy(phys_to_virt(phys), dma_addr, size); |
ef9b18935 swiotlb: support ... |
314 |
} |
1b548f667 swiotlb: factor o... |
315 |
} |
1da177e4c Linux-2.6.12-rc2 |
316 317 318 319 |
/* * Allocates bounce buffer and returns its kernel virtual address. */ static void * |
bc40ac669 swiotlb: store ph... |
320 |
map_single(struct device *hwdev, phys_addr_t phys, size_t size, int dir) |
1da177e4c Linux-2.6.12-rc2 |
321 322 323 324 325 |
{ unsigned long flags; char *dma_addr; unsigned int nslots, stride, index, wrap; int i; |
681cc5cd3 iommu sg merging:... |
326 327 328 329 330 331 |
unsigned long start_dma_addr; unsigned long mask; unsigned long offset_slots; unsigned long max_slots; mask = dma_get_seg_boundary(hwdev); |
70a7d3cc1 swiotlb: add hwde... |
332 |
start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start) & mask; |
681cc5cd3 iommu sg merging:... |
333 334 |
offset_slots = ALIGN(start_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; |
a5ddde4a5 swiotlb: add comm... |
335 336 337 338 |
/* * Carefully handle integer overflow which can occur when mask == ~0UL. */ |
b15a3891c avoid endless loo... |
339 340 341 |
max_slots = mask + 1 ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT); |
1da177e4c Linux-2.6.12-rc2 |
342 343 344 345 346 347 348 349 350 351 |
/* * For mappings greater than a page, we limit the stride (and * hence alignment) to a page size. */ nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; if (size > PAGE_SIZE) stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT)); else stride = 1; |
348145458 BUG_ON() Conversi... |
352 |
BUG_ON(!nslots); |
1da177e4c Linux-2.6.12-rc2 |
353 354 355 356 357 358 |
/* * Find suitable number of IO TLB entries size that will fit this * request and allocate a buffer from that IO TLB pool. */ spin_lock_irqsave(&io_tlb_lock, flags); |
a7133a155 lib/swiotlb.c: cl... |
359 360 361 362 363 364 |
index = ALIGN(io_tlb_index, stride); if (index >= io_tlb_nslabs) index = 0; wrap = index; do { |
a85225092 swiotlb: use iomm... |
365 366 |
while (iommu_is_span_boundary(index, nslots, offset_slots, max_slots)) { |
b15a3891c avoid endless loo... |
367 368 369 |
index += stride; if (index >= io_tlb_nslabs) index = 0; |
a7133a155 lib/swiotlb.c: cl... |
370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 |
if (index == wrap) goto not_found; } /* * If we find a slot that indicates we have 'nslots' number of * contiguous buffers, we allocate the buffers from that slot * and mark the entries as '0' indicating unavailable. */ if (io_tlb_list[index] >= nslots) { int count = 0; for (i = index; i < (int) (index + nslots); i++) io_tlb_list[i] = 0; for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE - 1) && io_tlb_list[i]; i--) io_tlb_list[i] = ++count; dma_addr = io_tlb_start + (index << IO_TLB_SHIFT); |
1da177e4c Linux-2.6.12-rc2 |
387 |
|
a7133a155 lib/swiotlb.c: cl... |
388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 |
/* * Update the indices to avoid searching in the next * round. */ io_tlb_index = ((index + nslots) < io_tlb_nslabs ? (index + nslots) : 0); goto found; } index += stride; if (index >= io_tlb_nslabs) index = 0; } while (index != wrap); not_found: spin_unlock_irqrestore(&io_tlb_lock, flags); return NULL; found: |
1da177e4c Linux-2.6.12-rc2 |
406 407 408 409 410 411 412 |
spin_unlock_irqrestore(&io_tlb_lock, flags); /* * Save away the mapping from the original address to the DMA address. * This is needed when we sync the memory. Then we sync the buffer if * needed. */ |
bc40ac669 swiotlb: store ph... |
413 414 |
for (i = 0; i < nslots; i++) io_tlb_orig_addr[index+i] = phys + (i << IO_TLB_SHIFT); |
1da177e4c Linux-2.6.12-rc2 |
415 |
if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) |
fb05a3792 swiotlb: add supp... |
416 |
swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE); |
1da177e4c Linux-2.6.12-rc2 |
417 418 419 420 421 422 423 424 |
return dma_addr; } /* * dma_addr is the kernel virtual address of the bounce buffer to unmap. */ static void |
7fcebbd2d swiotlb: rename u... |
425 |
do_unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir) |
1da177e4c Linux-2.6.12-rc2 |
426 427 428 429 |
{ unsigned long flags; int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT; |
bc40ac669 swiotlb: store ph... |
430 |
phys_addr_t phys = io_tlb_orig_addr[index]; |
1da177e4c Linux-2.6.12-rc2 |
431 432 433 434 |
/* * First, sync the memory before unmapping the entry */ |
bc40ac669 swiotlb: store ph... |
435 |
if (phys && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL))) |
fb05a3792 swiotlb: add supp... |
436 |
swiotlb_bounce(phys, dma_addr, size, DMA_FROM_DEVICE); |
1da177e4c Linux-2.6.12-rc2 |
437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 |
/* * Return the buffer to the free list by setting the corresponding * entries to indicate the number of contigous entries available. * While returning the entries to the free list, we merge the entries * with slots below and above the pool being returned. */ spin_lock_irqsave(&io_tlb_lock, flags); { count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ? io_tlb_list[index + nslots] : 0); /* * Step 1: return the slots to the free list, merging the * slots with superceeding slots */ for (i = index + nslots - 1; i >= index; i--) io_tlb_list[i] = ++count; /* * Step 2: merge the returned slots with the preceding slots, * if available (non zero) */ for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--) io_tlb_list[i] = ++count; } spin_unlock_irqrestore(&io_tlb_lock, flags); } static void |
de69e0f0b [PATCH] swiotlb: ... |
465 466 |
sync_single(struct device *hwdev, char *dma_addr, size_t size, int dir, int target) |
1da177e4c Linux-2.6.12-rc2 |
467 |
{ |
bc40ac669 swiotlb: store ph... |
468 469 470 471 |
int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT; phys_addr_t phys = io_tlb_orig_addr[index]; phys += ((unsigned long)dma_addr & ((1 << IO_TLB_SHIFT) - 1)); |
df336d1c7 Fix swiotlb_sync_... |
472 |
|
de69e0f0b [PATCH] swiotlb: ... |
473 474 475 |
switch (target) { case SYNC_FOR_CPU: if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)) |
fb05a3792 swiotlb: add supp... |
476 |
swiotlb_bounce(phys, dma_addr, size, DMA_FROM_DEVICE); |
348145458 BUG_ON() Conversi... |
477 478 |
else BUG_ON(dir != DMA_TO_DEVICE); |
de69e0f0b [PATCH] swiotlb: ... |
479 480 481 |
break; case SYNC_FOR_DEVICE: if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)) |
fb05a3792 swiotlb: add supp... |
482 |
swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE); |
348145458 BUG_ON() Conversi... |
483 484 |
else BUG_ON(dir != DMA_FROM_DEVICE); |
de69e0f0b [PATCH] swiotlb: ... |
485 486 |
break; default: |
1da177e4c Linux-2.6.12-rc2 |
487 |
BUG(); |
de69e0f0b [PATCH] swiotlb: ... |
488 |
} |
1da177e4c Linux-2.6.12-rc2 |
489 490 491 492 |
} void * swiotlb_alloc_coherent(struct device *hwdev, size_t size, |
06a544971 [PATCH] gfp_t: dm... |
493 |
dma_addr_t *dma_handle, gfp_t flags) |
1da177e4c Linux-2.6.12-rc2 |
494 |
{ |
563aaf064 [IA64] swiotlb cl... |
495 |
dma_addr_t dev_addr; |
1da177e4c Linux-2.6.12-rc2 |
496 497 |
void *ret; int order = get_order(size); |
284901a90 dma-mapping: repl... |
498 |
u64 dma_mask = DMA_BIT_MASK(32); |
1e74f3000 swiotlb: use cohe... |
499 500 501 |
if (hwdev && hwdev->coherent_dma_mask) dma_mask = hwdev->coherent_dma_mask; |
1da177e4c Linux-2.6.12-rc2 |
502 |
|
25667d675 Revert "[IA64] sw... |
503 |
ret = (void *)__get_free_pages(flags, order); |
b9394647a swiotlb: use dma_... |
504 |
if (ret && swiotlb_virt_to_bus(hwdev, ret) + size > dma_mask) { |
1da177e4c Linux-2.6.12-rc2 |
505 506 |
/* * The allocated memory isn't reachable by the device. |
1da177e4c Linux-2.6.12-rc2 |
507 508 509 510 511 512 513 |
*/ free_pages((unsigned long) ret, order); ret = NULL; } if (!ret) { /* * We are either out of memory or the device can't DMA |
ceb5ac326 swiotlb: comment ... |
514 515 |
* to GFP_DMA memory; fall back on map_single(), which * will grab memory from the lowest available address range. |
1da177e4c Linux-2.6.12-rc2 |
516 |
*/ |
bc40ac669 swiotlb: store ph... |
517 |
ret = map_single(hwdev, 0, size, DMA_FROM_DEVICE); |
9dfda12b8 swiotlb: use map_... |
518 |
if (!ret) |
1da177e4c Linux-2.6.12-rc2 |
519 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
520 521 522 |
} memset(ret, 0, size); |
70a7d3cc1 swiotlb: add hwde... |
523 |
dev_addr = swiotlb_virt_to_bus(hwdev, ret); |
1da177e4c Linux-2.6.12-rc2 |
524 525 |
/* Confirm address can be DMA'd by device */ |
b9394647a swiotlb: use dma_... |
526 |
if (dev_addr + size > dma_mask) { |
563aaf064 [IA64] swiotlb cl... |
527 528 |
printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx ", |
1e74f3000 swiotlb: use cohe... |
529 |
(unsigned long long)dma_mask, |
563aaf064 [IA64] swiotlb cl... |
530 |
(unsigned long long)dev_addr); |
a2b89b596 swiotlb: remove p... |
531 532 |
/* DMA_TO_DEVICE to avoid memcpy in unmap_single */ |
7fcebbd2d swiotlb: rename u... |
533 |
do_unmap_single(hwdev, ret, size, DMA_TO_DEVICE); |
a2b89b596 swiotlb: remove p... |
534 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
535 536 537 538 |
} *dma_handle = dev_addr; return ret; } |
874d6a955 swiotlb: clean up... |
539 |
EXPORT_SYMBOL(swiotlb_alloc_coherent); |
1da177e4c Linux-2.6.12-rc2 |
540 541 542 |
void swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, |
02ca646e7 swiotlb: remove u... |
543 |
dma_addr_t dev_addr) |
1da177e4c Linux-2.6.12-rc2 |
544 |
{ |
862d196b2 swiotlb: use phys... |
545 |
phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); |
02ca646e7 swiotlb: remove u... |
546 |
|
aa24886e3 dma_free_coherent... |
547 |
WARN_ON(irqs_disabled()); |
02ca646e7 swiotlb: remove u... |
548 549 |
if (!is_swiotlb_buffer(paddr)) free_pages((unsigned long)vaddr, get_order(size)); |
1da177e4c Linux-2.6.12-rc2 |
550 551 |
else /* DMA_TO_DEVICE to avoid memcpy in unmap_single */ |
7fcebbd2d swiotlb: rename u... |
552 |
do_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE); |
1da177e4c Linux-2.6.12-rc2 |
553 |
} |
874d6a955 swiotlb: clean up... |
554 |
EXPORT_SYMBOL(swiotlb_free_coherent); |
1da177e4c Linux-2.6.12-rc2 |
555 556 557 558 559 560 561 |
static void swiotlb_full(struct device *dev, size_t size, int dir, int do_panic) { /* * Ran out of IOMMU space for this operation. This is very bad. * Unfortunately the drivers cannot handle this operation properly. |
17e5ad6c0 [PATCH] Removed r... |
562 |
* unless they check for dma_mapping_error (most don't) |
1da177e4c Linux-2.6.12-rc2 |
563 564 565 |
* When the mapping is small enough return a static buffer to limit * the damage, or panic when the transfer is too big. */ |
563aaf064 [IA64] swiotlb cl... |
566 |
printk(KERN_ERR "DMA: Out of SW-IOMMU space for %zu bytes at " |
94b324864 swiotlb: struct d... |
567 568 |
"device %s ", size, dev ? dev_name(dev) : "?"); |
1da177e4c Linux-2.6.12-rc2 |
569 |
|
c7084b35e lib/swiotlb.c: Fi... |
570 571 572 573 574 575 576 577 578 579 580 581 |
if (size <= io_tlb_overflow || !do_panic) return; if (dir == DMA_BIDIRECTIONAL) panic("DMA: Random memory could be DMA accessed "); if (dir == DMA_FROM_DEVICE) panic("DMA: Random memory could be DMA written "); if (dir == DMA_TO_DEVICE) panic("DMA: Random memory could be DMA read "); |
1da177e4c Linux-2.6.12-rc2 |
582 583 584 585 |
} /* * Map a single buffer of the indicated size for DMA in streaming mode. The |
17e5ad6c0 [PATCH] Removed r... |
586 |
* physical address to use is returned. |
1da177e4c Linux-2.6.12-rc2 |
587 588 |
* * Once the device is given the dma address, the device owns this memory until |
ceb5ac326 swiotlb: comment ... |
589 |
* either swiotlb_unmap_page or swiotlb_dma_sync_single is performed. |
1da177e4c Linux-2.6.12-rc2 |
590 |
*/ |
f98eee8ea x86, ia64: remove... |
591 592 593 594 |
dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs) |
1da177e4c Linux-2.6.12-rc2 |
595 |
{ |
f98eee8ea x86, ia64: remove... |
596 |
phys_addr_t phys = page_to_phys(page) + offset; |
862d196b2 swiotlb: use phys... |
597 |
dma_addr_t dev_addr = phys_to_dma(dev, phys); |
1da177e4c Linux-2.6.12-rc2 |
598 |
void *map; |
348145458 BUG_ON() Conversi... |
599 |
BUG_ON(dir == DMA_NONE); |
1da177e4c Linux-2.6.12-rc2 |
600 |
/* |
ceb5ac326 swiotlb: comment ... |
601 |
* If the address happens to be in the device's DMA window, |
1da177e4c Linux-2.6.12-rc2 |
602 603 604 |
* we can safely return the device addr and not worry about bounce * buffering it. */ |
b9394647a swiotlb: use dma_... |
605 |
if (dma_capable(dev, dev_addr, size) && !swiotlb_force) |
1da177e4c Linux-2.6.12-rc2 |
606 607 608 609 610 |
return dev_addr; /* * Oh well, have to allocate and map a bounce buffer. */ |
f98eee8ea x86, ia64: remove... |
611 |
map = map_single(dev, phys, size, dir); |
1da177e4c Linux-2.6.12-rc2 |
612 |
if (!map) { |
f98eee8ea x86, ia64: remove... |
613 |
swiotlb_full(dev, size, dir, 1); |
1da177e4c Linux-2.6.12-rc2 |
614 615 |
map = io_tlb_overflow_buffer; } |
f98eee8ea x86, ia64: remove... |
616 |
dev_addr = swiotlb_virt_to_bus(dev, map); |
1da177e4c Linux-2.6.12-rc2 |
617 618 619 620 |
/* * Ensure that the address returned is DMA'ble */ |
b9394647a swiotlb: use dma_... |
621 |
if (!dma_capable(dev, dev_addr, size)) |
1da177e4c Linux-2.6.12-rc2 |
622 623 624 625 |
panic("map_single: bounce buffer is not DMA'ble"); return dev_addr; } |
f98eee8ea x86, ia64: remove... |
626 |
EXPORT_SYMBOL_GPL(swiotlb_map_page); |
1da177e4c Linux-2.6.12-rc2 |
627 628 |
/* |
1da177e4c Linux-2.6.12-rc2 |
629 |
* Unmap a single streaming mode DMA translation. The dma_addr and size must |
ceb5ac326 swiotlb: comment ... |
630 |
* match what was provided for in a previous swiotlb_map_page call. All |
1da177e4c Linux-2.6.12-rc2 |
631 632 633 634 635 |
* other usages are undefined. * * After this call, reads by the cpu to the buffer are guaranteed to see * whatever the device wrote there. */ |
7fcebbd2d swiotlb: rename u... |
636 637 |
static void unmap_single(struct device *hwdev, dma_addr_t dev_addr, size_t size, int dir) |
1da177e4c Linux-2.6.12-rc2 |
638 |
{ |
862d196b2 swiotlb: use phys... |
639 |
phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); |
1da177e4c Linux-2.6.12-rc2 |
640 |
|
348145458 BUG_ON() Conversi... |
641 |
BUG_ON(dir == DMA_NONE); |
7fcebbd2d swiotlb: rename u... |
642 |
|
02ca646e7 swiotlb: remove u... |
643 644 |
if (is_swiotlb_buffer(paddr)) { do_unmap_single(hwdev, phys_to_virt(paddr), size, dir); |
7fcebbd2d swiotlb: rename u... |
645 646 647 648 649 |
return; } if (dir != DMA_FROM_DEVICE) return; |
02ca646e7 swiotlb: remove u... |
650 651 652 653 654 655 656 |
/* * phys_to_virt doesn't work with hihgmem page but we could * call dma_mark_clean() with hihgmem page here. However, we * are fine since dma_mark_clean() is null on POWERPC. We can * make dma_mark_clean() take a physical address if necessary. */ dma_mark_clean(phys_to_virt(paddr), size); |
7fcebbd2d swiotlb: rename u... |
657 658 659 660 661 662 663 |
} void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs) { unmap_single(hwdev, dev_addr, size, dir); |
1da177e4c Linux-2.6.12-rc2 |
664 |
} |
f98eee8ea x86, ia64: remove... |
665 |
EXPORT_SYMBOL_GPL(swiotlb_unmap_page); |
874d6a955 swiotlb: clean up... |
666 |
|
1da177e4c Linux-2.6.12-rc2 |
667 668 669 670 |
/* * Make physical memory consistent for a single streaming mode DMA translation * after a transfer. * |
ceb5ac326 swiotlb: comment ... |
671 |
* If you perform a swiotlb_map_page() but wish to interrogate the buffer |
17e5ad6c0 [PATCH] Removed r... |
672 673 |
* using the cpu, yet do not wish to teardown the dma mapping, you must * call this function before doing so. At the next point you give the dma |
1da177e4c Linux-2.6.12-rc2 |
674 675 676 |
* address back to the card, you must first perform a * swiotlb_dma_sync_for_device, and then the device again owns the buffer */ |
be6b02678 [PATCH] swiotlb u... |
677 |
static void |
8270f3f1a [PATCH] swiotlb: ... |
678 |
swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr, |
de69e0f0b [PATCH] swiotlb: ... |
679 |
size_t size, int dir, int target) |
1da177e4c Linux-2.6.12-rc2 |
680 |
{ |
862d196b2 swiotlb: use phys... |
681 |
phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); |
1da177e4c Linux-2.6.12-rc2 |
682 |
|
348145458 BUG_ON() Conversi... |
683 |
BUG_ON(dir == DMA_NONE); |
380d68783 swiotlb: use swio... |
684 |
|
02ca646e7 swiotlb: remove u... |
685 686 |
if (is_swiotlb_buffer(paddr)) { sync_single(hwdev, phys_to_virt(paddr), size, dir, target); |
380d68783 swiotlb: use swio... |
687 688 689 690 691 |
return; } if (dir != DMA_FROM_DEVICE) return; |
02ca646e7 swiotlb: remove u... |
692 |
dma_mark_clean(phys_to_virt(paddr), size); |
1da177e4c Linux-2.6.12-rc2 |
693 694 695 |
} void |
8270f3f1a [PATCH] swiotlb: ... |
696 |
swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, |
160c1d8e4 x86, ia64: conver... |
697 |
size_t size, enum dma_data_direction dir) |
8270f3f1a [PATCH] swiotlb: ... |
698 |
{ |
de69e0f0b [PATCH] swiotlb: ... |
699 |
swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU); |
8270f3f1a [PATCH] swiotlb: ... |
700 |
} |
874d6a955 swiotlb: clean up... |
701 |
EXPORT_SYMBOL(swiotlb_sync_single_for_cpu); |
8270f3f1a [PATCH] swiotlb: ... |
702 703 |
void |
1da177e4c Linux-2.6.12-rc2 |
704 |
swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, |
160c1d8e4 x86, ia64: conver... |
705 |
size_t size, enum dma_data_direction dir) |
1da177e4c Linux-2.6.12-rc2 |
706 |
{ |
de69e0f0b [PATCH] swiotlb: ... |
707 |
swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE); |
1da177e4c Linux-2.6.12-rc2 |
708 |
} |
874d6a955 swiotlb: clean up... |
709 |
EXPORT_SYMBOL(swiotlb_sync_single_for_device); |
1da177e4c Linux-2.6.12-rc2 |
710 711 |
/* |
878a97cfd [PATCH] swiotlb: ... |
712 713 |
* Same as above, but for a sub-range of the mapping. */ |
be6b02678 [PATCH] swiotlb u... |
714 |
static void |
878a97cfd [PATCH] swiotlb: ... |
715 |
swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr, |
de69e0f0b [PATCH] swiotlb: ... |
716 717 |
unsigned long offset, size_t size, int dir, int target) |
878a97cfd [PATCH] swiotlb: ... |
718 |
{ |
380d68783 swiotlb: use swio... |
719 |
swiotlb_sync_single(hwdev, dev_addr + offset, size, dir, target); |
878a97cfd [PATCH] swiotlb: ... |
720 721 722 723 |
} void swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr, |
160c1d8e4 x86, ia64: conver... |
724 725 |
unsigned long offset, size_t size, enum dma_data_direction dir) |
878a97cfd [PATCH] swiotlb: ... |
726 |
{ |
de69e0f0b [PATCH] swiotlb: ... |
727 728 |
swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir, SYNC_FOR_CPU); |
878a97cfd [PATCH] swiotlb: ... |
729 |
} |
874d6a955 swiotlb: clean up... |
730 |
EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu); |
878a97cfd [PATCH] swiotlb: ... |
731 732 733 |
void swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr, |
160c1d8e4 x86, ia64: conver... |
734 735 |
unsigned long offset, size_t size, enum dma_data_direction dir) |
878a97cfd [PATCH] swiotlb: ... |
736 |
{ |
de69e0f0b [PATCH] swiotlb: ... |
737 738 |
swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir, SYNC_FOR_DEVICE); |
878a97cfd [PATCH] swiotlb: ... |
739 |
} |
874d6a955 swiotlb: clean up... |
740 |
EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device); |
878a97cfd [PATCH] swiotlb: ... |
741 742 |
/* |
1da177e4c Linux-2.6.12-rc2 |
743 |
* Map a set of buffers described by scatterlist in streaming mode for DMA. |
ceb5ac326 swiotlb: comment ... |
744 |
* This is the scatter-gather version of the above swiotlb_map_page |
1da177e4c Linux-2.6.12-rc2 |
745 746 747 748 749 750 751 752 753 754 |
* interface. Here the scatter gather list elements are each tagged with the * appropriate dma address and length. They are obtained via * sg_dma_{address,length}(SG). * * NOTE: An implementation may be able to use a smaller number of * DMA address/length pairs than there are SG table elements. * (for example via virtual mapping capabilities) * The routine returns the number of addr/length pairs actually * used, at most nents. * |
ceb5ac326 swiotlb: comment ... |
755 |
* Device ownership issues as mentioned above for swiotlb_map_page are the |
1da177e4c Linux-2.6.12-rc2 |
756 757 758 |
* same here. */ int |
309df0c50 dma/ia64: update ... |
759 |
swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, |
160c1d8e4 x86, ia64: conver... |
760 |
enum dma_data_direction dir, struct dma_attrs *attrs) |
1da177e4c Linux-2.6.12-rc2 |
761 |
{ |
dbfd49fe9 swiotlb: sg chain... |
762 |
struct scatterlist *sg; |
1da177e4c Linux-2.6.12-rc2 |
763 |
int i; |
348145458 BUG_ON() Conversi... |
764 |
BUG_ON(dir == DMA_NONE); |
1da177e4c Linux-2.6.12-rc2 |
765 |
|
dbfd49fe9 swiotlb: sg chain... |
766 |
for_each_sg(sgl, sg, nelems, i) { |
961d7d0ee swiotlb: do not u... |
767 |
phys_addr_t paddr = sg_phys(sg); |
862d196b2 swiotlb: use phys... |
768 |
dma_addr_t dev_addr = phys_to_dma(hwdev, paddr); |
bc40ac669 swiotlb: store ph... |
769 |
|
cf56e3f2e swiotlb: remove s... |
770 |
if (swiotlb_force || |
b9394647a swiotlb: use dma_... |
771 |
!dma_capable(hwdev, dev_addr, sg->length)) { |
bc40ac669 swiotlb: store ph... |
772 773 |
void *map = map_single(hwdev, sg_phys(sg), sg->length, dir); |
7e8702334 [PATCH] Fix swiot... |
774 |
if (!map) { |
1da177e4c Linux-2.6.12-rc2 |
775 776 777 |
/* Don't panic here, we expect map_sg users to do proper error handling. */ swiotlb_full(hwdev, sg->length, dir, 0); |
309df0c50 dma/ia64: update ... |
778 779 |
swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir, attrs); |
dbfd49fe9 swiotlb: sg chain... |
780 |
sgl[0].dma_length = 0; |
1da177e4c Linux-2.6.12-rc2 |
781 782 |
return 0; } |
70a7d3cc1 swiotlb: add hwde... |
783 |
sg->dma_address = swiotlb_virt_to_bus(hwdev, map); |
1da177e4c Linux-2.6.12-rc2 |
784 785 786 787 788 789 |
} else sg->dma_address = dev_addr; sg->dma_length = sg->length; } return nelems; } |
309df0c50 dma/ia64: update ... |
790 791 792 793 794 795 796 797 |
EXPORT_SYMBOL(swiotlb_map_sg_attrs); int swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems, int dir) { return swiotlb_map_sg_attrs(hwdev, sgl, nelems, dir, NULL); } |
874d6a955 swiotlb: clean up... |
798 |
EXPORT_SYMBOL(swiotlb_map_sg); |
1da177e4c Linux-2.6.12-rc2 |
799 800 801 |
/* * Unmap a set of streaming mode DMA translations. Again, cpu read rules |
ceb5ac326 swiotlb: comment ... |
802 |
* concerning calls here are the same as for swiotlb_unmap_page() above. |
1da177e4c Linux-2.6.12-rc2 |
803 804 |
*/ void |
309df0c50 dma/ia64: update ... |
805 |
swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, |
160c1d8e4 x86, ia64: conver... |
806 |
int nelems, enum dma_data_direction dir, struct dma_attrs *attrs) |
1da177e4c Linux-2.6.12-rc2 |
807 |
{ |
dbfd49fe9 swiotlb: sg chain... |
808 |
struct scatterlist *sg; |
1da177e4c Linux-2.6.12-rc2 |
809 |
int i; |
348145458 BUG_ON() Conversi... |
810 |
BUG_ON(dir == DMA_NONE); |
1da177e4c Linux-2.6.12-rc2 |
811 |
|
7fcebbd2d swiotlb: rename u... |
812 813 |
for_each_sg(sgl, sg, nelems, i) unmap_single(hwdev, sg->dma_address, sg->dma_length, dir); |
1da177e4c Linux-2.6.12-rc2 |
814 |
} |
309df0c50 dma/ia64: update ... |
815 816 817 818 819 820 821 822 |
EXPORT_SYMBOL(swiotlb_unmap_sg_attrs); void swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems, int dir) { return swiotlb_unmap_sg_attrs(hwdev, sgl, nelems, dir, NULL); } |
874d6a955 swiotlb: clean up... |
823 |
EXPORT_SYMBOL(swiotlb_unmap_sg); |
1da177e4c Linux-2.6.12-rc2 |
824 825 826 827 828 829 830 831 |
/* * Make physical memory consistent for a set of streaming mode DMA translations * after a transfer. * * The same as swiotlb_sync_single_* but for a scatter-gather list, same rules * and usage. */ |
be6b02678 [PATCH] swiotlb u... |
832 |
static void |
dbfd49fe9 swiotlb: sg chain... |
833 |
swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl, |
de69e0f0b [PATCH] swiotlb: ... |
834 |
int nelems, int dir, int target) |
1da177e4c Linux-2.6.12-rc2 |
835 |
{ |
dbfd49fe9 swiotlb: sg chain... |
836 |
struct scatterlist *sg; |
1da177e4c Linux-2.6.12-rc2 |
837 |
int i; |
380d68783 swiotlb: use swio... |
838 839 |
for_each_sg(sgl, sg, nelems, i) swiotlb_sync_single(hwdev, sg->dma_address, |
de69e0f0b [PATCH] swiotlb: ... |
840 |
sg->dma_length, dir, target); |
1da177e4c Linux-2.6.12-rc2 |
841 842 843 |
} void |
8270f3f1a [PATCH] swiotlb: ... |
844 |
swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, |
160c1d8e4 x86, ia64: conver... |
845 |
int nelems, enum dma_data_direction dir) |
8270f3f1a [PATCH] swiotlb: ... |
846 |
{ |
de69e0f0b [PATCH] swiotlb: ... |
847 |
swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU); |
8270f3f1a [PATCH] swiotlb: ... |
848 |
} |
874d6a955 swiotlb: clean up... |
849 |
EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu); |
8270f3f1a [PATCH] swiotlb: ... |
850 851 |
void |
1da177e4c Linux-2.6.12-rc2 |
852 |
swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, |
160c1d8e4 x86, ia64: conver... |
853 |
int nelems, enum dma_data_direction dir) |
1da177e4c Linux-2.6.12-rc2 |
854 |
{ |
de69e0f0b [PATCH] swiotlb: ... |
855 |
swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE); |
1da177e4c Linux-2.6.12-rc2 |
856 |
} |
874d6a955 swiotlb: clean up... |
857 |
EXPORT_SYMBOL(swiotlb_sync_sg_for_device); |
1da177e4c Linux-2.6.12-rc2 |
858 859 |
int |
8d8bb39b9 dma-mapping: add ... |
860 |
swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr) |
1da177e4c Linux-2.6.12-rc2 |
861 |
{ |
70a7d3cc1 swiotlb: add hwde... |
862 |
return (dma_addr == swiotlb_virt_to_bus(hwdev, io_tlb_overflow_buffer)); |
1da177e4c Linux-2.6.12-rc2 |
863 |
} |
874d6a955 swiotlb: clean up... |
864 |
EXPORT_SYMBOL(swiotlb_dma_mapping_error); |
1da177e4c Linux-2.6.12-rc2 |
865 866 |
/* |
17e5ad6c0 [PATCH] Removed r... |
867 |
* Return whether the given device DMA address mask can be supported |
1da177e4c Linux-2.6.12-rc2 |
868 |
* properly. For example, if your device can only drive the low 24-bits |
17e5ad6c0 [PATCH] Removed r... |
869 |
* during bus mastering, then you would pass 0x00ffffff as the mask to |
1da177e4c Linux-2.6.12-rc2 |
870 871 872 |
* this function. */ int |
563aaf064 [IA64] swiotlb cl... |
873 |
swiotlb_dma_supported(struct device *hwdev, u64 mask) |
1da177e4c Linux-2.6.12-rc2 |
874 |
{ |
70a7d3cc1 swiotlb: add hwde... |
875 |
return swiotlb_virt_to_bus(hwdev, io_tlb_end - 1) <= mask; |
1da177e4c Linux-2.6.12-rc2 |
876 |
} |
1da177e4c Linux-2.6.12-rc2 |
877 |
EXPORT_SYMBOL(swiotlb_dma_supported); |