Glauber Costa | 459121c9 | 2008-04-08 13:20:43 -0300 | [diff] [blame] | 1 | #include <linux/dma-mapping.h> |
Glauber Costa | cb5867a | 2008-04-08 13:20:51 -0300 | [diff] [blame] | 2 | #include <linux/dmar.h> |
Glauber Costa | 116890d | 2008-04-08 13:20:54 -0300 | [diff] [blame] | 3 | #include <linux/bootmem.h> |
Glauber Costa | bca5c09 | 2008-04-08 13:20:53 -0300 | [diff] [blame] | 4 | #include <linux/pci.h> |
Glauber Costa | cb5867a | 2008-04-08 13:20:51 -0300 | [diff] [blame] | 5 | |
Glauber Costa | 116890d | 2008-04-08 13:20:54 -0300 | [diff] [blame] | 6 | #include <asm/proto.h> |
| 7 | #include <asm/dma.h> |
Glauber Costa | cb5867a | 2008-04-08 13:20:51 -0300 | [diff] [blame] | 8 | #include <asm/gart.h> |
| 9 | #include <asm/calgary.h> |
Joerg Roedel | a69ca34 | 2008-06-26 21:28:08 +0200 | [diff] [blame^] | 10 | #include <asm/amd_iommu.h> |
Glauber Costa | 459121c9 | 2008-04-08 13:20:43 -0300 | [diff] [blame] | 11 | |
Glauber Costa | bca5c09 | 2008-04-08 13:20:53 -0300 | [diff] [blame] | 12 | int forbid_dac __read_mostly; |
| 13 | EXPORT_SYMBOL(forbid_dac); |
| 14 | |
Glauber Costa | 85c246e | 2008-04-08 13:20:50 -0300 | [diff] [blame] | 15 | const struct dma_mapping_ops *dma_ops; |
| 16 | EXPORT_SYMBOL(dma_ops); |
| 17 | |
Dmitri Vorobiev | b4cdc43 | 2008-04-28 03:15:58 +0400 | [diff] [blame] | 18 | static int iommu_sac_force __read_mostly; |
Glauber Costa | 8e0c379 | 2008-04-08 13:20:55 -0300 | [diff] [blame] | 19 | |
Glauber Costa | f9c258d | 2008-04-08 13:20:52 -0300 | [diff] [blame] | 20 | #ifdef CONFIG_IOMMU_DEBUG |
| 21 | int panic_on_overflow __read_mostly = 1; |
| 22 | int force_iommu __read_mostly = 1; |
| 23 | #else |
| 24 | int panic_on_overflow __read_mostly = 0; |
| 25 | int force_iommu __read_mostly = 0; |
| 26 | #endif |
| 27 | |
Glauber Costa | fae9a0d | 2008-04-08 13:20:56 -0300 | [diff] [blame] | 28 | int iommu_merge __read_mostly = 0; |
| 29 | |
| 30 | int no_iommu __read_mostly; |
| 31 | /* Set this to 1 if there is a HW IOMMU in the system */ |
| 32 | int iommu_detected __read_mostly = 0; |
| 33 | |
| 34 | /* This tells the BIO block layer to assume merging. Default to off |
| 35 | because we cannot guarantee merging later. */ |
| 36 | int iommu_bio_merge __read_mostly = 0; |
| 37 | EXPORT_SYMBOL(iommu_bio_merge); |
| 38 | |
Glauber Costa | cac6787 | 2008-04-08 13:21:00 -0300 | [diff] [blame] | 39 | dma_addr_t bad_dma_address __read_mostly = 0; |
| 40 | EXPORT_SYMBOL(bad_dma_address); |
Glauber Costa | fae9a0d | 2008-04-08 13:20:56 -0300 | [diff] [blame] | 41 | |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 42 | /* Dummy device used for NULL arguments (normally ISA). Better would |
| 43 | be probably a smaller DMA mask, but this is bug-to-bug compatible |
| 44 | to older i386. */ |
| 45 | struct device fallback_dev = { |
| 46 | .bus_id = "fallback device", |
| 47 | .coherent_dma_mask = DMA_32BIT_MASK, |
| 48 | .dma_mask = &fallback_dev.coherent_dma_mask, |
| 49 | }; |
| 50 | |
Glauber Costa | 459121c9 | 2008-04-08 13:20:43 -0300 | [diff] [blame] | 51 | int dma_set_mask(struct device *dev, u64 mask) |
| 52 | { |
| 53 | if (!dev->dma_mask || !dma_supported(dev, mask)) |
| 54 | return -EIO; |
| 55 | |
| 56 | *dev->dma_mask = mask; |
| 57 | |
| 58 | return 0; |
| 59 | } |
| 60 | EXPORT_SYMBOL(dma_set_mask); |
| 61 | |
Glauber Costa | 116890d | 2008-04-08 13:20:54 -0300 | [diff] [blame] | 62 | #ifdef CONFIG_X86_64 |
| 63 | static __initdata void *dma32_bootmem_ptr; |
| 64 | static unsigned long dma32_bootmem_size __initdata = (128ULL<<20); |
| 65 | |
| 66 | static int __init parse_dma32_size_opt(char *p) |
| 67 | { |
| 68 | if (!p) |
| 69 | return -EINVAL; |
| 70 | dma32_bootmem_size = memparse(p, &p); |
| 71 | return 0; |
| 72 | } |
| 73 | early_param("dma32_size", parse_dma32_size_opt); |
| 74 | |
| 75 | void __init dma32_reserve_bootmem(void) |
| 76 | { |
| 77 | unsigned long size, align; |
| 78 | if (end_pfn <= MAX_DMA32_PFN) |
| 79 | return; |
| 80 | |
| 81 | align = 64ULL<<20; |
| 82 | size = round_up(dma32_bootmem_size, align); |
| 83 | dma32_bootmem_ptr = __alloc_bootmem_nopanic(size, align, |
| 84 | __pa(MAX_DMA_ADDRESS)); |
| 85 | if (dma32_bootmem_ptr) |
| 86 | dma32_bootmem_size = size; |
| 87 | else |
| 88 | dma32_bootmem_size = 0; |
| 89 | } |
| 90 | static void __init dma32_free_bootmem(void) |
| 91 | { |
| 92 | int node; |
| 93 | |
| 94 | if (end_pfn <= MAX_DMA32_PFN) |
| 95 | return; |
| 96 | |
| 97 | if (!dma32_bootmem_ptr) |
| 98 | return; |
| 99 | |
| 100 | for_each_online_node(node) |
| 101 | free_bootmem_node(NODE_DATA(node), __pa(dma32_bootmem_ptr), |
| 102 | dma32_bootmem_size); |
| 103 | |
| 104 | dma32_bootmem_ptr = NULL; |
| 105 | dma32_bootmem_size = 0; |
| 106 | } |
| 107 | |
| 108 | void __init pci_iommu_alloc(void) |
| 109 | { |
| 110 | /* free the range so iommu could get some range less than 4G */ |
| 111 | dma32_free_bootmem(); |
| 112 | /* |
| 113 | * The order of these functions is important for |
| 114 | * fall-back/fail-over reasons |
| 115 | */ |
| 116 | #ifdef CONFIG_GART_IOMMU |
| 117 | gart_iommu_hole_init(); |
| 118 | #endif |
| 119 | |
| 120 | #ifdef CONFIG_CALGARY_IOMMU |
| 121 | detect_calgary(); |
| 122 | #endif |
| 123 | |
| 124 | detect_intel_iommu(); |
| 125 | |
Joerg Roedel | a69ca34 | 2008-06-26 21:28:08 +0200 | [diff] [blame^] | 126 | amd_iommu_detect(); |
| 127 | |
Glauber Costa | 116890d | 2008-04-08 13:20:54 -0300 | [diff] [blame] | 128 | #ifdef CONFIG_SWIOTLB |
| 129 | pci_swiotlb_init(); |
| 130 | #endif |
| 131 | } |
| 132 | #endif |
| 133 | |
Glauber Costa | fae9a0d | 2008-04-08 13:20:56 -0300 | [diff] [blame] | 134 | /* |
| 135 | * See <Documentation/x86_64/boot-options.txt> for the iommu kernel parameter |
| 136 | * documentation. |
| 137 | */ |
| 138 | static __init int iommu_setup(char *p) |
| 139 | { |
| 140 | iommu_merge = 1; |
| 141 | |
| 142 | if (!p) |
| 143 | return -EINVAL; |
| 144 | |
| 145 | while (*p) { |
| 146 | if (!strncmp(p, "off", 3)) |
| 147 | no_iommu = 1; |
| 148 | /* gart_parse_options has more force support */ |
| 149 | if (!strncmp(p, "force", 5)) |
| 150 | force_iommu = 1; |
| 151 | if (!strncmp(p, "noforce", 7)) { |
| 152 | iommu_merge = 0; |
| 153 | force_iommu = 0; |
| 154 | } |
| 155 | |
| 156 | if (!strncmp(p, "biomerge", 8)) { |
| 157 | iommu_bio_merge = 4096; |
| 158 | iommu_merge = 1; |
| 159 | force_iommu = 1; |
| 160 | } |
| 161 | if (!strncmp(p, "panic", 5)) |
| 162 | panic_on_overflow = 1; |
| 163 | if (!strncmp(p, "nopanic", 7)) |
| 164 | panic_on_overflow = 0; |
| 165 | if (!strncmp(p, "merge", 5)) { |
| 166 | iommu_merge = 1; |
| 167 | force_iommu = 1; |
| 168 | } |
| 169 | if (!strncmp(p, "nomerge", 7)) |
| 170 | iommu_merge = 0; |
| 171 | if (!strncmp(p, "forcesac", 8)) |
| 172 | iommu_sac_force = 1; |
| 173 | if (!strncmp(p, "allowdac", 8)) |
| 174 | forbid_dac = 0; |
| 175 | if (!strncmp(p, "nodac", 5)) |
| 176 | forbid_dac = -1; |
| 177 | if (!strncmp(p, "usedac", 6)) { |
| 178 | forbid_dac = -1; |
| 179 | return 1; |
| 180 | } |
| 181 | #ifdef CONFIG_SWIOTLB |
| 182 | if (!strncmp(p, "soft", 4)) |
| 183 | swiotlb = 1; |
| 184 | #endif |
| 185 | |
| 186 | #ifdef CONFIG_GART_IOMMU |
| 187 | gart_parse_options(p); |
| 188 | #endif |
| 189 | |
| 190 | #ifdef CONFIG_CALGARY_IOMMU |
| 191 | if (!strncmp(p, "calgary", 7)) |
| 192 | use_calgary = 1; |
| 193 | #endif /* CONFIG_CALGARY_IOMMU */ |
| 194 | |
| 195 | p += strcspn(p, ","); |
| 196 | if (*p == ',') |
| 197 | ++p; |
| 198 | } |
| 199 | return 0; |
| 200 | } |
| 201 | early_param("iommu", iommu_setup); |
| 202 | |
Glauber Costa | 8e8edc6 | 2008-04-08 13:20:57 -0300 | [diff] [blame] | 203 | #ifdef CONFIG_X86_32 |
| 204 | int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, |
| 205 | dma_addr_t device_addr, size_t size, int flags) |
| 206 | { |
| 207 | void __iomem *mem_base = NULL; |
| 208 | int pages = size >> PAGE_SHIFT; |
| 209 | int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long); |
| 210 | |
| 211 | if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0) |
| 212 | goto out; |
| 213 | if (!size) |
| 214 | goto out; |
| 215 | if (dev->dma_mem) |
| 216 | goto out; |
| 217 | |
| 218 | /* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */ |
| 219 | |
| 220 | mem_base = ioremap(bus_addr, size); |
| 221 | if (!mem_base) |
| 222 | goto out; |
| 223 | |
| 224 | dev->dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL); |
| 225 | if (!dev->dma_mem) |
| 226 | goto out; |
| 227 | dev->dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL); |
| 228 | if (!dev->dma_mem->bitmap) |
| 229 | goto free1_out; |
| 230 | |
| 231 | dev->dma_mem->virt_base = mem_base; |
| 232 | dev->dma_mem->device_base = device_addr; |
| 233 | dev->dma_mem->size = pages; |
| 234 | dev->dma_mem->flags = flags; |
| 235 | |
| 236 | if (flags & DMA_MEMORY_MAP) |
| 237 | return DMA_MEMORY_MAP; |
| 238 | |
| 239 | return DMA_MEMORY_IO; |
| 240 | |
| 241 | free1_out: |
| 242 | kfree(dev->dma_mem); |
| 243 | out: |
| 244 | if (mem_base) |
| 245 | iounmap(mem_base); |
| 246 | return 0; |
| 247 | } |
| 248 | EXPORT_SYMBOL(dma_declare_coherent_memory); |
| 249 | |
| 250 | void dma_release_declared_memory(struct device *dev) |
| 251 | { |
| 252 | struct dma_coherent_mem *mem = dev->dma_mem; |
| 253 | |
| 254 | if (!mem) |
| 255 | return; |
| 256 | dev->dma_mem = NULL; |
| 257 | iounmap(mem->virt_base); |
| 258 | kfree(mem->bitmap); |
| 259 | kfree(mem); |
| 260 | } |
| 261 | EXPORT_SYMBOL(dma_release_declared_memory); |
| 262 | |
| 263 | void *dma_mark_declared_memory_occupied(struct device *dev, |
| 264 | dma_addr_t device_addr, size_t size) |
| 265 | { |
| 266 | struct dma_coherent_mem *mem = dev->dma_mem; |
| 267 | int pos, err; |
| 268 | int pages = (size + (device_addr & ~PAGE_MASK) + PAGE_SIZE - 1); |
| 269 | |
| 270 | pages >>= PAGE_SHIFT; |
| 271 | |
| 272 | if (!mem) |
| 273 | return ERR_PTR(-EINVAL); |
| 274 | |
| 275 | pos = (device_addr - mem->device_base) >> PAGE_SHIFT; |
| 276 | err = bitmap_allocate_region(mem->bitmap, pos, get_order(pages)); |
| 277 | if (err != 0) |
| 278 | return ERR_PTR(err); |
| 279 | return mem->virt_base + (pos << PAGE_SHIFT); |
| 280 | } |
| 281 | EXPORT_SYMBOL(dma_mark_declared_memory_occupied); |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 282 | |
| 283 | static int dma_alloc_from_coherent_mem(struct device *dev, ssize_t size, |
| 284 | dma_addr_t *dma_handle, void **ret) |
| 285 | { |
| 286 | struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL; |
| 287 | int order = get_order(size); |
| 288 | |
| 289 | if (mem) { |
| 290 | int page = bitmap_find_free_region(mem->bitmap, mem->size, |
| 291 | order); |
| 292 | if (page >= 0) { |
| 293 | *dma_handle = mem->device_base + (page << PAGE_SHIFT); |
| 294 | *ret = mem->virt_base + (page << PAGE_SHIFT); |
| 295 | memset(*ret, 0, size); |
| 296 | } |
| 297 | if (mem->flags & DMA_MEMORY_EXCLUSIVE) |
| 298 | *ret = NULL; |
| 299 | } |
| 300 | return (mem != NULL); |
| 301 | } |
| 302 | |
| 303 | static int dma_release_coherent(struct device *dev, int order, void *vaddr) |
| 304 | { |
| 305 | struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL; |
| 306 | |
| 307 | if (mem && vaddr >= mem->virt_base && vaddr < |
| 308 | (mem->virt_base + (mem->size << PAGE_SHIFT))) { |
| 309 | int page = (vaddr - mem->virt_base) >> PAGE_SHIFT; |
| 310 | |
| 311 | bitmap_release_region(mem->bitmap, page, order); |
| 312 | return 1; |
| 313 | } |
| 314 | return 0; |
| 315 | } |
| 316 | #else |
| 317 | #define dma_alloc_from_coherent_mem(dev, size, handle, ret) (0) |
| 318 | #define dma_release_coherent(dev, order, vaddr) (0) |
Glauber Costa | 8e8edc6 | 2008-04-08 13:20:57 -0300 | [diff] [blame] | 319 | #endif /* CONFIG_X86_32 */ |
| 320 | |
Glauber Costa | 8e0c379 | 2008-04-08 13:20:55 -0300 | [diff] [blame] | 321 | int dma_supported(struct device *dev, u64 mask) |
| 322 | { |
| 323 | #ifdef CONFIG_PCI |
| 324 | if (mask > 0xffffffff && forbid_dac > 0) { |
| 325 | printk(KERN_INFO "PCI: Disallowing DAC for device %s\n", |
| 326 | dev->bus_id); |
| 327 | return 0; |
| 328 | } |
| 329 | #endif |
| 330 | |
| 331 | if (dma_ops->dma_supported) |
| 332 | return dma_ops->dma_supported(dev, mask); |
| 333 | |
| 334 | /* Copied from i386. Doesn't make much sense, because it will |
| 335 | only work for pci_alloc_coherent. |
| 336 | The caller just has to use GFP_DMA in this case. */ |
| 337 | if (mask < DMA_24BIT_MASK) |
| 338 | return 0; |
| 339 | |
| 340 | /* Tell the device to use SAC when IOMMU force is on. This |
| 341 | allows the driver to use cheaper accesses in some cases. |
| 342 | |
| 343 | Problem with this is that if we overflow the IOMMU area and |
| 344 | return DAC as fallback address the device may not handle it |
| 345 | correctly. |
| 346 | |
| 347 | As a special case some controllers have a 39bit address |
| 348 | mode that is as efficient as 32bit (aic79xx). Don't force |
| 349 | SAC for these. Assume all masks <= 40 bits are of this |
| 350 | type. Normally this doesn't make any difference, but gives |
| 351 | more gentle handling of IOMMU overflow. */ |
| 352 | if (iommu_sac_force && (mask >= DMA_40BIT_MASK)) { |
| 353 | printk(KERN_INFO "%s: Force SAC with mask %Lx\n", |
| 354 | dev->bus_id, mask); |
| 355 | return 0; |
| 356 | } |
| 357 | |
| 358 | return 1; |
| 359 | } |
| 360 | EXPORT_SYMBOL(dma_supported); |
| 361 | |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 362 | /* Allocate DMA memory on node near device */ |
| 363 | noinline struct page * |
| 364 | dma_alloc_pages(struct device *dev, gfp_t gfp, unsigned order) |
| 365 | { |
| 366 | int node; |
| 367 | |
| 368 | node = dev_to_node(dev); |
| 369 | |
| 370 | return alloc_pages_node(node, gfp, order); |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | * Allocate memory for a coherent mapping. |
| 375 | */ |
| 376 | void * |
| 377 | dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, |
| 378 | gfp_t gfp) |
| 379 | { |
| 380 | void *memory = NULL; |
| 381 | struct page *page; |
| 382 | unsigned long dma_mask = 0; |
| 383 | dma_addr_t bus; |
Miquel van Smoorenburg | b7f09ae | 2008-06-05 18:14:44 +0200 | [diff] [blame] | 384 | int noretry = 0; |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 385 | |
| 386 | /* ignore region specifiers */ |
| 387 | gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); |
| 388 | |
| 389 | if (dma_alloc_from_coherent_mem(dev, size, dma_handle, &memory)) |
| 390 | return memory; |
| 391 | |
Takashi Iwai | 4a367f3 | 2008-05-09 08:06:55 +0200 | [diff] [blame] | 392 | if (!dev) { |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 393 | dev = &fallback_dev; |
Takashi Iwai | 4a367f3 | 2008-05-09 08:06:55 +0200 | [diff] [blame] | 394 | gfp |= GFP_DMA; |
| 395 | } |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 396 | dma_mask = dev->coherent_dma_mask; |
| 397 | if (dma_mask == 0) |
Takashi Iwai | 4a367f3 | 2008-05-09 08:06:55 +0200 | [diff] [blame] | 398 | dma_mask = (gfp & GFP_DMA) ? DMA_24BIT_MASK : DMA_32BIT_MASK; |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 399 | |
| 400 | /* Device not DMA able */ |
| 401 | if (dev->dma_mask == NULL) |
| 402 | return NULL; |
| 403 | |
Miquel van Smoorenburg | b7f09ae | 2008-06-05 18:14:44 +0200 | [diff] [blame] | 404 | /* Don't invoke OOM killer or retry in lower 16MB DMA zone */ |
| 405 | if (gfp & __GFP_DMA) |
| 406 | noretry = 1; |
| 407 | |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 408 | #ifdef CONFIG_X86_64 |
| 409 | /* Why <=? Even when the mask is smaller than 4GB it is often |
| 410 | larger than 16MB and in this case we have a chance of |
| 411 | finding fitting memory in the next higher zone first. If |
| 412 | not retry with true GFP_DMA. -AK */ |
Miquel van Smoorenburg | b7f09ae | 2008-06-05 18:14:44 +0200 | [diff] [blame] | 413 | if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA)) { |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 414 | gfp |= GFP_DMA32; |
Miquel van Smoorenburg | b7f09ae | 2008-06-05 18:14:44 +0200 | [diff] [blame] | 415 | if (dma_mask < DMA_32BIT_MASK) |
| 416 | noretry = 1; |
| 417 | } |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 418 | #endif |
| 419 | |
| 420 | again: |
Miquel van Smoorenburg | db9f600 | 2008-05-28 10:31:25 +0200 | [diff] [blame] | 421 | page = dma_alloc_pages(dev, |
Miquel van Smoorenburg | b7f09ae | 2008-06-05 18:14:44 +0200 | [diff] [blame] | 422 | noretry ? gfp | __GFP_NORETRY : gfp, get_order(size)); |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 423 | if (page == NULL) |
| 424 | return NULL; |
| 425 | |
| 426 | { |
| 427 | int high, mmu; |
| 428 | bus = page_to_phys(page); |
| 429 | memory = page_address(page); |
| 430 | high = (bus + size) >= dma_mask; |
| 431 | mmu = high; |
| 432 | if (force_iommu && !(gfp & GFP_DMA)) |
| 433 | mmu = 1; |
| 434 | else if (high) { |
| 435 | free_pages((unsigned long)memory, |
| 436 | get_order(size)); |
| 437 | |
| 438 | /* Don't use the 16MB ZONE_DMA unless absolutely |
| 439 | needed. It's better to use remapping first. */ |
| 440 | if (dma_mask < DMA_32BIT_MASK && !(gfp & GFP_DMA)) { |
| 441 | gfp = (gfp & ~GFP_DMA32) | GFP_DMA; |
| 442 | goto again; |
| 443 | } |
| 444 | |
| 445 | /* Let low level make its own zone decisions */ |
| 446 | gfp &= ~(GFP_DMA32|GFP_DMA); |
| 447 | |
| 448 | if (dma_ops->alloc_coherent) |
| 449 | return dma_ops->alloc_coherent(dev, size, |
| 450 | dma_handle, gfp); |
| 451 | return NULL; |
| 452 | } |
| 453 | |
| 454 | memset(memory, 0, size); |
| 455 | if (!mmu) { |
| 456 | *dma_handle = bus; |
| 457 | return memory; |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | if (dma_ops->alloc_coherent) { |
| 462 | free_pages((unsigned long)memory, get_order(size)); |
| 463 | gfp &= ~(GFP_DMA|GFP_DMA32); |
| 464 | return dma_ops->alloc_coherent(dev, size, dma_handle, gfp); |
| 465 | } |
| 466 | |
| 467 | if (dma_ops->map_simple) { |
| 468 | *dma_handle = dma_ops->map_simple(dev, virt_to_phys(memory), |
| 469 | size, |
| 470 | PCI_DMA_BIDIRECTIONAL); |
| 471 | if (*dma_handle != bad_dma_address) |
| 472 | return memory; |
| 473 | } |
| 474 | |
| 475 | if (panic_on_overflow) |
| 476 | panic("dma_alloc_coherent: IOMMU overflow by %lu bytes\n", |
| 477 | (unsigned long)size); |
| 478 | free_pages((unsigned long)memory, get_order(size)); |
| 479 | return NULL; |
| 480 | } |
| 481 | EXPORT_SYMBOL(dma_alloc_coherent); |
| 482 | |
| 483 | /* |
| 484 | * Unmap coherent memory. |
| 485 | * The caller must ensure that the device has finished accessing the mapping. |
| 486 | */ |
| 487 | void dma_free_coherent(struct device *dev, size_t size, |
| 488 | void *vaddr, dma_addr_t bus) |
| 489 | { |
| 490 | int order = get_order(size); |
| 491 | WARN_ON(irqs_disabled()); /* for portability */ |
| 492 | if (dma_release_coherent(dev, order, vaddr)) |
| 493 | return; |
| 494 | if (dma_ops->unmap_single) |
| 495 | dma_ops->unmap_single(dev, bus, size, 0); |
| 496 | free_pages((unsigned long)vaddr, order); |
| 497 | } |
| 498 | EXPORT_SYMBOL(dma_free_coherent); |
Glauber Costa | 8e0c379 | 2008-04-08 13:20:55 -0300 | [diff] [blame] | 499 | |
Glauber Costa | cb5867a | 2008-04-08 13:20:51 -0300 | [diff] [blame] | 500 | static int __init pci_iommu_init(void) |
| 501 | { |
| 502 | #ifdef CONFIG_CALGARY_IOMMU |
| 503 | calgary_iommu_init(); |
| 504 | #endif |
Glauber Costa | 459121c9 | 2008-04-08 13:20:43 -0300 | [diff] [blame] | 505 | |
Glauber Costa | cb5867a | 2008-04-08 13:20:51 -0300 | [diff] [blame] | 506 | intel_iommu_init(); |
| 507 | |
Joerg Roedel | a69ca34 | 2008-06-26 21:28:08 +0200 | [diff] [blame^] | 508 | amd_iommu_init(); |
| 509 | |
Glauber Costa | cb5867a | 2008-04-08 13:20:51 -0300 | [diff] [blame] | 510 | #ifdef CONFIG_GART_IOMMU |
| 511 | gart_iommu_init(); |
| 512 | #endif |
| 513 | |
| 514 | no_iommu_init(); |
| 515 | return 0; |
| 516 | } |
| 517 | |
| 518 | void pci_iommu_shutdown(void) |
| 519 | { |
| 520 | gart_iommu_shutdown(); |
| 521 | } |
| 522 | /* Must execute after PCI subsystem */ |
| 523 | fs_initcall(pci_iommu_init); |
Glauber Costa | bca5c09 | 2008-04-08 13:20:53 -0300 | [diff] [blame] | 524 | |
| 525 | #ifdef CONFIG_PCI |
| 526 | /* Many VIA bridges seem to corrupt data for DAC. Disable it here */ |
| 527 | |
| 528 | static __devinit void via_no_dac(struct pci_dev *dev) |
| 529 | { |
| 530 | if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && forbid_dac == 0) { |
| 531 | printk(KERN_INFO "PCI: VIA PCI bridge detected." |
| 532 | "Disabling DAC.\n"); |
| 533 | forbid_dac = 1; |
| 534 | } |
| 535 | } |
| 536 | DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID, via_no_dac); |
| 537 | #endif |