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> |
FUJITA Tomonori | 46a7fa2 | 2008-07-11 10:23:42 +0900 | [diff] [blame^] | 8 | #include <asm/iommu.h> |
Glauber Costa | cb5867a | 2008-04-08 13:20:51 -0300 | [diff] [blame] | 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; |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 78 | if (max_pfn <= MAX_DMA32_PFN) |
Glauber Costa | 116890d | 2008-04-08 13:20:54 -0300 | [diff] [blame] | 79 | return; |
| 80 | |
Yinghai Lu | 7677b2e | 2008-04-14 20:40:37 -0700 | [diff] [blame] | 81 | /* |
| 82 | * check aperture_64.c allocate_aperture() for reason about |
| 83 | * using 512M as goal |
| 84 | */ |
Glauber Costa | 116890d | 2008-04-08 13:20:54 -0300 | [diff] [blame] | 85 | align = 64ULL<<20; |
| 86 | size = round_up(dma32_bootmem_size, align); |
| 87 | dma32_bootmem_ptr = __alloc_bootmem_nopanic(size, align, |
Yinghai Lu | 7677b2e | 2008-04-14 20:40:37 -0700 | [diff] [blame] | 88 | 512ULL<<20); |
Glauber Costa | 116890d | 2008-04-08 13:20:54 -0300 | [diff] [blame] | 89 | if (dma32_bootmem_ptr) |
| 90 | dma32_bootmem_size = size; |
| 91 | else |
| 92 | dma32_bootmem_size = 0; |
| 93 | } |
| 94 | static void __init dma32_free_bootmem(void) |
| 95 | { |
Glauber Costa | 116890d | 2008-04-08 13:20:54 -0300 | [diff] [blame] | 96 | |
Yinghai Lu | c987d12 | 2008-06-24 22:14:09 -0700 | [diff] [blame] | 97 | if (max_pfn <= MAX_DMA32_PFN) |
Glauber Costa | 116890d | 2008-04-08 13:20:54 -0300 | [diff] [blame] | 98 | return; |
| 99 | |
| 100 | if (!dma32_bootmem_ptr) |
| 101 | return; |
| 102 | |
Yinghai Lu | 330fce2 | 2008-04-19 01:31:45 -0700 | [diff] [blame] | 103 | free_bootmem(__pa(dma32_bootmem_ptr), dma32_bootmem_size); |
Glauber Costa | 116890d | 2008-04-08 13:20:54 -0300 | [diff] [blame] | 104 | |
| 105 | dma32_bootmem_ptr = NULL; |
| 106 | dma32_bootmem_size = 0; |
| 107 | } |
| 108 | |
| 109 | void __init pci_iommu_alloc(void) |
| 110 | { |
| 111 | /* free the range so iommu could get some range less than 4G */ |
| 112 | dma32_free_bootmem(); |
| 113 | /* |
| 114 | * The order of these functions is important for |
| 115 | * fall-back/fail-over reasons |
| 116 | */ |
| 117 | #ifdef CONFIG_GART_IOMMU |
| 118 | gart_iommu_hole_init(); |
| 119 | #endif |
| 120 | |
| 121 | #ifdef CONFIG_CALGARY_IOMMU |
| 122 | detect_calgary(); |
| 123 | #endif |
| 124 | |
| 125 | detect_intel_iommu(); |
| 126 | |
Joerg Roedel | a69ca34 | 2008-06-26 21:28:08 +0200 | [diff] [blame] | 127 | amd_iommu_detect(); |
| 128 | |
Glauber Costa | 116890d | 2008-04-08 13:20:54 -0300 | [diff] [blame] | 129 | #ifdef CONFIG_SWIOTLB |
| 130 | pci_swiotlb_init(); |
| 131 | #endif |
| 132 | } |
| 133 | #endif |
| 134 | |
Glauber Costa | fae9a0d | 2008-04-08 13:20:56 -0300 | [diff] [blame] | 135 | /* |
| 136 | * See <Documentation/x86_64/boot-options.txt> for the iommu kernel parameter |
| 137 | * documentation. |
| 138 | */ |
| 139 | static __init int iommu_setup(char *p) |
| 140 | { |
| 141 | iommu_merge = 1; |
| 142 | |
| 143 | if (!p) |
| 144 | return -EINVAL; |
| 145 | |
| 146 | while (*p) { |
| 147 | if (!strncmp(p, "off", 3)) |
| 148 | no_iommu = 1; |
| 149 | /* gart_parse_options has more force support */ |
| 150 | if (!strncmp(p, "force", 5)) |
| 151 | force_iommu = 1; |
| 152 | if (!strncmp(p, "noforce", 7)) { |
| 153 | iommu_merge = 0; |
| 154 | force_iommu = 0; |
| 155 | } |
| 156 | |
| 157 | if (!strncmp(p, "biomerge", 8)) { |
| 158 | iommu_bio_merge = 4096; |
| 159 | iommu_merge = 1; |
| 160 | force_iommu = 1; |
| 161 | } |
| 162 | if (!strncmp(p, "panic", 5)) |
| 163 | panic_on_overflow = 1; |
| 164 | if (!strncmp(p, "nopanic", 7)) |
| 165 | panic_on_overflow = 0; |
| 166 | if (!strncmp(p, "merge", 5)) { |
| 167 | iommu_merge = 1; |
| 168 | force_iommu = 1; |
| 169 | } |
| 170 | if (!strncmp(p, "nomerge", 7)) |
| 171 | iommu_merge = 0; |
| 172 | if (!strncmp(p, "forcesac", 8)) |
| 173 | iommu_sac_force = 1; |
| 174 | if (!strncmp(p, "allowdac", 8)) |
| 175 | forbid_dac = 0; |
| 176 | if (!strncmp(p, "nodac", 5)) |
| 177 | forbid_dac = -1; |
| 178 | if (!strncmp(p, "usedac", 6)) { |
| 179 | forbid_dac = -1; |
| 180 | return 1; |
| 181 | } |
| 182 | #ifdef CONFIG_SWIOTLB |
| 183 | if (!strncmp(p, "soft", 4)) |
| 184 | swiotlb = 1; |
| 185 | #endif |
| 186 | |
| 187 | #ifdef CONFIG_GART_IOMMU |
| 188 | gart_parse_options(p); |
| 189 | #endif |
| 190 | |
| 191 | #ifdef CONFIG_CALGARY_IOMMU |
| 192 | if (!strncmp(p, "calgary", 7)) |
| 193 | use_calgary = 1; |
| 194 | #endif /* CONFIG_CALGARY_IOMMU */ |
| 195 | |
| 196 | p += strcspn(p, ","); |
| 197 | if (*p == ',') |
| 198 | ++p; |
| 199 | } |
| 200 | return 0; |
| 201 | } |
| 202 | early_param("iommu", iommu_setup); |
| 203 | |
Glauber Costa | 8e8edc6 | 2008-04-08 13:20:57 -0300 | [diff] [blame] | 204 | #ifdef CONFIG_X86_32 |
| 205 | int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr, |
| 206 | dma_addr_t device_addr, size_t size, int flags) |
| 207 | { |
| 208 | void __iomem *mem_base = NULL; |
| 209 | int pages = size >> PAGE_SHIFT; |
| 210 | int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long); |
| 211 | |
| 212 | if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0) |
| 213 | goto out; |
| 214 | if (!size) |
| 215 | goto out; |
| 216 | if (dev->dma_mem) |
| 217 | goto out; |
| 218 | |
| 219 | /* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */ |
| 220 | |
| 221 | mem_base = ioremap(bus_addr, size); |
| 222 | if (!mem_base) |
| 223 | goto out; |
| 224 | |
| 225 | dev->dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL); |
| 226 | if (!dev->dma_mem) |
| 227 | goto out; |
| 228 | dev->dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL); |
| 229 | if (!dev->dma_mem->bitmap) |
| 230 | goto free1_out; |
| 231 | |
| 232 | dev->dma_mem->virt_base = mem_base; |
| 233 | dev->dma_mem->device_base = device_addr; |
| 234 | dev->dma_mem->size = pages; |
| 235 | dev->dma_mem->flags = flags; |
| 236 | |
| 237 | if (flags & DMA_MEMORY_MAP) |
| 238 | return DMA_MEMORY_MAP; |
| 239 | |
| 240 | return DMA_MEMORY_IO; |
| 241 | |
| 242 | free1_out: |
| 243 | kfree(dev->dma_mem); |
| 244 | out: |
| 245 | if (mem_base) |
| 246 | iounmap(mem_base); |
| 247 | return 0; |
| 248 | } |
| 249 | EXPORT_SYMBOL(dma_declare_coherent_memory); |
| 250 | |
| 251 | void dma_release_declared_memory(struct device *dev) |
| 252 | { |
| 253 | struct dma_coherent_mem *mem = dev->dma_mem; |
| 254 | |
| 255 | if (!mem) |
| 256 | return; |
| 257 | dev->dma_mem = NULL; |
| 258 | iounmap(mem->virt_base); |
| 259 | kfree(mem->bitmap); |
| 260 | kfree(mem); |
| 261 | } |
| 262 | EXPORT_SYMBOL(dma_release_declared_memory); |
| 263 | |
| 264 | void *dma_mark_declared_memory_occupied(struct device *dev, |
| 265 | dma_addr_t device_addr, size_t size) |
| 266 | { |
| 267 | struct dma_coherent_mem *mem = dev->dma_mem; |
| 268 | int pos, err; |
| 269 | int pages = (size + (device_addr & ~PAGE_MASK) + PAGE_SIZE - 1); |
| 270 | |
| 271 | pages >>= PAGE_SHIFT; |
| 272 | |
| 273 | if (!mem) |
| 274 | return ERR_PTR(-EINVAL); |
| 275 | |
| 276 | pos = (device_addr - mem->device_base) >> PAGE_SHIFT; |
| 277 | err = bitmap_allocate_region(mem->bitmap, pos, get_order(pages)); |
| 278 | if (err != 0) |
| 279 | return ERR_PTR(err); |
| 280 | return mem->virt_base + (pos << PAGE_SHIFT); |
| 281 | } |
| 282 | EXPORT_SYMBOL(dma_mark_declared_memory_occupied); |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 283 | |
| 284 | static int dma_alloc_from_coherent_mem(struct device *dev, ssize_t size, |
| 285 | dma_addr_t *dma_handle, void **ret) |
| 286 | { |
| 287 | struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL; |
| 288 | int order = get_order(size); |
| 289 | |
| 290 | if (mem) { |
| 291 | int page = bitmap_find_free_region(mem->bitmap, mem->size, |
| 292 | order); |
| 293 | if (page >= 0) { |
| 294 | *dma_handle = mem->device_base + (page << PAGE_SHIFT); |
| 295 | *ret = mem->virt_base + (page << PAGE_SHIFT); |
| 296 | memset(*ret, 0, size); |
| 297 | } |
| 298 | if (mem->flags & DMA_MEMORY_EXCLUSIVE) |
| 299 | *ret = NULL; |
| 300 | } |
| 301 | return (mem != NULL); |
| 302 | } |
| 303 | |
| 304 | static int dma_release_coherent(struct device *dev, int order, void *vaddr) |
| 305 | { |
| 306 | struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL; |
| 307 | |
| 308 | if (mem && vaddr >= mem->virt_base && vaddr < |
| 309 | (mem->virt_base + (mem->size << PAGE_SHIFT))) { |
| 310 | int page = (vaddr - mem->virt_base) >> PAGE_SHIFT; |
| 311 | |
| 312 | bitmap_release_region(mem->bitmap, page, order); |
| 313 | return 1; |
| 314 | } |
| 315 | return 0; |
| 316 | } |
| 317 | #else |
| 318 | #define dma_alloc_from_coherent_mem(dev, size, handle, ret) (0) |
| 319 | #define dma_release_coherent(dev, order, vaddr) (0) |
Glauber Costa | 8e8edc6 | 2008-04-08 13:20:57 -0300 | [diff] [blame] | 320 | #endif /* CONFIG_X86_32 */ |
| 321 | |
Glauber Costa | 8e0c379 | 2008-04-08 13:20:55 -0300 | [diff] [blame] | 322 | int dma_supported(struct device *dev, u64 mask) |
| 323 | { |
| 324 | #ifdef CONFIG_PCI |
| 325 | if (mask > 0xffffffff && forbid_dac > 0) { |
| 326 | printk(KERN_INFO "PCI: Disallowing DAC for device %s\n", |
| 327 | dev->bus_id); |
| 328 | return 0; |
| 329 | } |
| 330 | #endif |
| 331 | |
| 332 | if (dma_ops->dma_supported) |
| 333 | return dma_ops->dma_supported(dev, mask); |
| 334 | |
| 335 | /* Copied from i386. Doesn't make much sense, because it will |
| 336 | only work for pci_alloc_coherent. |
| 337 | The caller just has to use GFP_DMA in this case. */ |
| 338 | if (mask < DMA_24BIT_MASK) |
| 339 | return 0; |
| 340 | |
| 341 | /* Tell the device to use SAC when IOMMU force is on. This |
| 342 | allows the driver to use cheaper accesses in some cases. |
| 343 | |
| 344 | Problem with this is that if we overflow the IOMMU area and |
| 345 | return DAC as fallback address the device may not handle it |
| 346 | correctly. |
| 347 | |
| 348 | As a special case some controllers have a 39bit address |
| 349 | mode that is as efficient as 32bit (aic79xx). Don't force |
| 350 | SAC for these. Assume all masks <= 40 bits are of this |
| 351 | type. Normally this doesn't make any difference, but gives |
| 352 | more gentle handling of IOMMU overflow. */ |
| 353 | if (iommu_sac_force && (mask >= DMA_40BIT_MASK)) { |
| 354 | printk(KERN_INFO "%s: Force SAC with mask %Lx\n", |
| 355 | dev->bus_id, mask); |
| 356 | return 0; |
| 357 | } |
| 358 | |
| 359 | return 1; |
| 360 | } |
| 361 | EXPORT_SYMBOL(dma_supported); |
| 362 | |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 363 | /* Allocate DMA memory on node near device */ |
Adrian Bunk | 311f834 | 2008-05-12 15:43:37 +0200 | [diff] [blame] | 364 | static noinline struct page * |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 365 | dma_alloc_pages(struct device *dev, gfp_t gfp, unsigned order) |
| 366 | { |
| 367 | int node; |
| 368 | |
| 369 | node = dev_to_node(dev); |
| 370 | |
| 371 | return alloc_pages_node(node, gfp, order); |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * Allocate memory for a coherent mapping. |
| 376 | */ |
| 377 | void * |
| 378 | dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, |
| 379 | gfp_t gfp) |
| 380 | { |
| 381 | void *memory = NULL; |
| 382 | struct page *page; |
| 383 | unsigned long dma_mask = 0; |
| 384 | dma_addr_t bus; |
Miquel van Smoorenburg | b7f09ae | 2008-06-05 18:14:44 +0200 | [diff] [blame] | 385 | int noretry = 0; |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 386 | |
| 387 | /* ignore region specifiers */ |
| 388 | gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); |
| 389 | |
| 390 | if (dma_alloc_from_coherent_mem(dev, size, dma_handle, &memory)) |
| 391 | return memory; |
| 392 | |
Takashi Iwai | 4a367f3 | 2008-05-09 08:06:55 +0200 | [diff] [blame] | 393 | if (!dev) { |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 394 | dev = &fallback_dev; |
Takashi Iwai | 4a367f3 | 2008-05-09 08:06:55 +0200 | [diff] [blame] | 395 | gfp |= GFP_DMA; |
| 396 | } |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 397 | dma_mask = dev->coherent_dma_mask; |
| 398 | if (dma_mask == 0) |
Takashi Iwai | 4a367f3 | 2008-05-09 08:06:55 +0200 | [diff] [blame] | 399 | dma_mask = (gfp & GFP_DMA) ? DMA_24BIT_MASK : DMA_32BIT_MASK; |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 400 | |
| 401 | /* Device not DMA able */ |
| 402 | if (dev->dma_mask == NULL) |
| 403 | return NULL; |
| 404 | |
Miquel van Smoorenburg | b7f09ae | 2008-06-05 18:14:44 +0200 | [diff] [blame] | 405 | /* Don't invoke OOM killer or retry in lower 16MB DMA zone */ |
| 406 | if (gfp & __GFP_DMA) |
| 407 | noretry = 1; |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 408 | |
| 409 | #ifdef CONFIG_X86_64 |
| 410 | /* Why <=? Even when the mask is smaller than 4GB it is often |
| 411 | larger than 16MB and in this case we have a chance of |
| 412 | finding fitting memory in the next higher zone first. If |
| 413 | not retry with true GFP_DMA. -AK */ |
Miquel van Smoorenburg | b7f09ae | 2008-06-05 18:14:44 +0200 | [diff] [blame] | 414 | if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA)) { |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 415 | gfp |= GFP_DMA32; |
Miquel van Smoorenburg | b7f09ae | 2008-06-05 18:14:44 +0200 | [diff] [blame] | 416 | if (dma_mask < DMA_32BIT_MASK) |
| 417 | noretry = 1; |
| 418 | } |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 419 | #endif |
| 420 | |
| 421 | again: |
Miquel van Smoorenburg | db9f600 | 2008-05-28 10:31:25 +0200 | [diff] [blame] | 422 | page = dma_alloc_pages(dev, |
Miquel van Smoorenburg | b7f09ae | 2008-06-05 18:14:44 +0200 | [diff] [blame] | 423 | noretry ? gfp | __GFP_NORETRY : gfp, get_order(size)); |
Glauber Costa | 098cb7f | 2008-04-09 13:18:10 -0300 | [diff] [blame] | 424 | if (page == NULL) |
| 425 | return NULL; |
| 426 | |
| 427 | { |
| 428 | int high, mmu; |
| 429 | bus = page_to_phys(page); |
| 430 | memory = page_address(page); |
| 431 | high = (bus + size) >= dma_mask; |
| 432 | mmu = high; |
| 433 | if (force_iommu && !(gfp & GFP_DMA)) |
| 434 | mmu = 1; |
| 435 | else if (high) { |
| 436 | free_pages((unsigned long)memory, |
| 437 | get_order(size)); |
| 438 | |
| 439 | /* Don't use the 16MB ZONE_DMA unless absolutely |
| 440 | needed. It's better to use remapping first. */ |
| 441 | if (dma_mask < DMA_32BIT_MASK && !(gfp & GFP_DMA)) { |
| 442 | gfp = (gfp & ~GFP_DMA32) | GFP_DMA; |
| 443 | goto again; |
| 444 | } |
| 445 | |
| 446 | /* Let low level make its own zone decisions */ |
| 447 | gfp &= ~(GFP_DMA32|GFP_DMA); |
| 448 | |
| 449 | if (dma_ops->alloc_coherent) |
| 450 | return dma_ops->alloc_coherent(dev, size, |
| 451 | dma_handle, gfp); |
| 452 | return NULL; |
| 453 | } |
| 454 | |
| 455 | memset(memory, 0, size); |
| 456 | if (!mmu) { |
| 457 | *dma_handle = bus; |
| 458 | return memory; |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | if (dma_ops->alloc_coherent) { |
| 463 | free_pages((unsigned long)memory, get_order(size)); |
| 464 | gfp &= ~(GFP_DMA|GFP_DMA32); |
| 465 | return dma_ops->alloc_coherent(dev, size, dma_handle, gfp); |
| 466 | } |
| 467 | |
| 468 | if (dma_ops->map_simple) { |
| 469 | *dma_handle = dma_ops->map_simple(dev, virt_to_phys(memory), |
| 470 | size, |
| 471 | PCI_DMA_BIDIRECTIONAL); |
| 472 | if (*dma_handle != bad_dma_address) |
| 473 | return memory; |
| 474 | } |
| 475 | |
| 476 | if (panic_on_overflow) |
| 477 | panic("dma_alloc_coherent: IOMMU overflow by %lu bytes\n", |
| 478 | (unsigned long)size); |
| 479 | free_pages((unsigned long)memory, get_order(size)); |
| 480 | return NULL; |
| 481 | } |
| 482 | EXPORT_SYMBOL(dma_alloc_coherent); |
| 483 | |
| 484 | /* |
| 485 | * Unmap coherent memory. |
| 486 | * The caller must ensure that the device has finished accessing the mapping. |
| 487 | */ |
| 488 | void dma_free_coherent(struct device *dev, size_t size, |
| 489 | void *vaddr, dma_addr_t bus) |
| 490 | { |
| 491 | int order = get_order(size); |
| 492 | WARN_ON(irqs_disabled()); /* for portability */ |
| 493 | if (dma_release_coherent(dev, order, vaddr)) |
| 494 | return; |
| 495 | if (dma_ops->unmap_single) |
| 496 | dma_ops->unmap_single(dev, bus, size, 0); |
| 497 | free_pages((unsigned long)vaddr, order); |
| 498 | } |
| 499 | EXPORT_SYMBOL(dma_free_coherent); |
Glauber Costa | 8e0c379 | 2008-04-08 13:20:55 -0300 | [diff] [blame] | 500 | |
Glauber Costa | cb5867a | 2008-04-08 13:20:51 -0300 | [diff] [blame] | 501 | static int __init pci_iommu_init(void) |
| 502 | { |
| 503 | #ifdef CONFIG_CALGARY_IOMMU |
| 504 | calgary_iommu_init(); |
| 505 | #endif |
Glauber Costa | 459121c9 | 2008-04-08 13:20:43 -0300 | [diff] [blame] | 506 | |
Glauber Costa | cb5867a | 2008-04-08 13:20:51 -0300 | [diff] [blame] | 507 | intel_iommu_init(); |
| 508 | |
Joerg Roedel | a69ca34 | 2008-06-26 21:28:08 +0200 | [diff] [blame] | 509 | amd_iommu_init(); |
| 510 | |
Glauber Costa | cb5867a | 2008-04-08 13:20:51 -0300 | [diff] [blame] | 511 | #ifdef CONFIG_GART_IOMMU |
| 512 | gart_iommu_init(); |
| 513 | #endif |
| 514 | |
| 515 | no_iommu_init(); |
| 516 | return 0; |
| 517 | } |
| 518 | |
| 519 | void pci_iommu_shutdown(void) |
| 520 | { |
| 521 | gart_iommu_shutdown(); |
| 522 | } |
| 523 | /* Must execute after PCI subsystem */ |
| 524 | fs_initcall(pci_iommu_init); |
Glauber Costa | bca5c09 | 2008-04-08 13:20:53 -0300 | [diff] [blame] | 525 | |
| 526 | #ifdef CONFIG_PCI |
| 527 | /* Many VIA bridges seem to corrupt data for DAC. Disable it here */ |
| 528 | |
| 529 | static __devinit void via_no_dac(struct pci_dev *dev) |
| 530 | { |
| 531 | if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && forbid_dac == 0) { |
| 532 | printk(KERN_INFO "PCI: VIA PCI bridge detected." |
| 533 | "Disabling DAC.\n"); |
| 534 | forbid_dac = 1; |
| 535 | } |
| 536 | } |
| 537 | DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID, via_no_dac); |
| 538 | #endif |