1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Shared support code for AMD K8 northbridges and derivatives. 4 * Copyright 2006 Andi Kleen, SUSE Labs. 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/types.h> 10 #include <linux/slab.h> 11 #include <linux/init.h> 12 #include <linux/errno.h> 13 #include <linux/export.h> 14 #include <linux/spinlock.h> 15 #include <linux/pci_ids.h> 16 #include <asm/amd_nb.h> 17 18 #define PCI_DEVICE_ID_AMD_17H_ROOT 0x1450 19 #define PCI_DEVICE_ID_AMD_17H_M10H_ROOT 0x15d0 20 #define PCI_DEVICE_ID_AMD_17H_M30H_ROOT 0x1480 21 #define PCI_DEVICE_ID_AMD_17H_M60H_ROOT 0x1630 22 #define PCI_DEVICE_ID_AMD_17H_MA0H_ROOT 0x14b5 23 #define PCI_DEVICE_ID_AMD_19H_M10H_ROOT 0x14a4 24 #define PCI_DEVICE_ID_AMD_19H_M40H_ROOT 0x14b5 25 #define PCI_DEVICE_ID_AMD_19H_M60H_ROOT 0x14d8 26 #define PCI_DEVICE_ID_AMD_19H_M70H_ROOT 0x14e8 27 #define PCI_DEVICE_ID_AMD_1AH_M00H_ROOT 0x153a 28 #define PCI_DEVICE_ID_AMD_1AH_M20H_ROOT 0x1507 29 #define PCI_DEVICE_ID_AMD_MI200_ROOT 0x14bb 30 #define PCI_DEVICE_ID_AMD_MI300_ROOT 0x14f8 31 32 #define PCI_DEVICE_ID_AMD_17H_DF_F4 0x1464 33 #define PCI_DEVICE_ID_AMD_17H_M10H_DF_F4 0x15ec 34 #define PCI_DEVICE_ID_AMD_17H_M30H_DF_F4 0x1494 35 #define PCI_DEVICE_ID_AMD_17H_M60H_DF_F4 0x144c 36 #define PCI_DEVICE_ID_AMD_17H_M70H_DF_F4 0x1444 37 #define PCI_DEVICE_ID_AMD_17H_MA0H_DF_F4 0x1728 38 #define PCI_DEVICE_ID_AMD_19H_DF_F4 0x1654 39 #define PCI_DEVICE_ID_AMD_19H_M10H_DF_F4 0x14b1 40 #define PCI_DEVICE_ID_AMD_19H_M40H_DF_F4 0x167d 41 #define PCI_DEVICE_ID_AMD_19H_M50H_DF_F4 0x166e 42 #define PCI_DEVICE_ID_AMD_19H_M60H_DF_F4 0x14e4 43 #define PCI_DEVICE_ID_AMD_19H_M70H_DF_F4 0x14f4 44 #define PCI_DEVICE_ID_AMD_19H_M78H_DF_F4 0x12fc 45 #define PCI_DEVICE_ID_AMD_1AH_M00H_DF_F4 0x12c4 46 #define PCI_DEVICE_ID_AMD_MI200_DF_F4 0x14d4 47 #define PCI_DEVICE_ID_AMD_MI300_DF_F4 0x152c 48 49 /* Protect the PCI config register pairs used for SMN. */ 50 static DEFINE_MUTEX(smn_mutex); 51 52 static u32 *flush_words; 53 54 static const struct pci_device_id amd_root_ids[] = { 55 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_ROOT) }, 56 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_ROOT) }, 57 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_ROOT) }, 58 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_ROOT) }, 59 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_MA0H_ROOT) }, 60 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M10H_ROOT) }, 61 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_ROOT) }, 62 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M60H_ROOT) }, 63 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M70H_ROOT) }, 64 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M00H_ROOT) }, 65 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M20H_ROOT) }, 66 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI200_ROOT) }, 67 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI300_ROOT) }, 68 {} 69 }; 70 71 #define PCI_DEVICE_ID_AMD_CNB17H_F4 0x1704 72 73 static const struct pci_device_id amd_nb_misc_ids[] = { 74 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) }, 75 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) }, 76 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) }, 77 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) }, 78 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) }, 79 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F3) }, 80 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) }, 81 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F3) }, 82 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_DF_F3) }, 83 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_DF_F3) }, 84 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_DF_F3) }, 85 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_DF_F3) }, 86 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_MA0H_DF_F3) }, 87 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) }, 88 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F3) }, 89 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F3) }, 90 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M10H_DF_F3) }, 91 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F3) }, 92 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F3) }, 93 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M60H_DF_F3) }, 94 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M70H_DF_F3) }, 95 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M78H_DF_F3) }, 96 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M00H_DF_F3) }, 97 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M20H_DF_F3) }, 98 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M70H_DF_F3) }, 99 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI200_DF_F3) }, 100 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI300_DF_F3) }, 101 {} 102 }; 103 104 static const struct pci_device_id amd_nb_link_ids[] = { 105 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) }, 106 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) }, 107 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F4) }, 108 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) }, 109 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F4) }, 110 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_DF_F4) }, 111 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_DF_F4) }, 112 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_DF_F4) }, 113 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_DF_F4) }, 114 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F4) }, 115 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_MA0H_DF_F4) }, 116 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F4) }, 117 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M10H_DF_F4) }, 118 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F4) }, 119 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F4) }, 120 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M60H_DF_F4) }, 121 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M70H_DF_F4) }, 122 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M78H_DF_F4) }, 123 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F4) }, 124 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M00H_DF_F4) }, 125 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI200_DF_F4) }, 126 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI300_DF_F4) }, 127 {} 128 }; 129 130 static const struct pci_device_id hygon_root_ids[] = { 131 { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_ROOT) }, 132 {} 133 }; 134 135 static const struct pci_device_id hygon_nb_misc_ids[] = { 136 { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_DF_F3) }, 137 {} 138 }; 139 140 static const struct pci_device_id hygon_nb_link_ids[] = { 141 { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_DF_F4) }, 142 {} 143 }; 144 145 const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[] __initconst = { 146 { 0x00, 0x18, 0x20 }, 147 { 0xff, 0x00, 0x20 }, 148 { 0xfe, 0x00, 0x20 }, 149 { } 150 }; 151 152 static struct amd_northbridge_info amd_northbridges; 153 154 u16 amd_nb_num(void) 155 { 156 return amd_northbridges.num; 157 } 158 EXPORT_SYMBOL_GPL(amd_nb_num); 159 160 bool amd_nb_has_feature(unsigned int feature) 161 { 162 return ((amd_northbridges.flags & feature) == feature); 163 } 164 EXPORT_SYMBOL_GPL(amd_nb_has_feature); 165 166 struct amd_northbridge *node_to_amd_nb(int node) 167 { 168 return (node < amd_northbridges.num) ? &amd_northbridges.nb[node] : NULL; 169 } 170 EXPORT_SYMBOL_GPL(node_to_amd_nb); 171 172 static struct pci_dev *next_northbridge(struct pci_dev *dev, 173 const struct pci_device_id *ids) 174 { 175 do { 176 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); 177 if (!dev) 178 break; 179 } while (!pci_match_id(ids, dev)); 180 return dev; 181 } 182 183 static int __amd_smn_rw(u16 node, u32 address, u32 *value, bool write) 184 { 185 struct pci_dev *root; 186 int err = -ENODEV; 187 188 if (node >= amd_northbridges.num) 189 goto out; 190 191 root = node_to_amd_nb(node)->root; 192 if (!root) 193 goto out; 194 195 mutex_lock(&smn_mutex); 196 197 err = pci_write_config_dword(root, 0x60, address); 198 if (err) { 199 pr_warn("Error programming SMN address 0x%x.\n", address); 200 goto out_unlock; 201 } 202 203 err = (write ? pci_write_config_dword(root, 0x64, *value) 204 : pci_read_config_dword(root, 0x64, value)); 205 if (err) 206 pr_warn("Error %s SMN address 0x%x.\n", 207 (write ? "writing to" : "reading from"), address); 208 209 out_unlock: 210 mutex_unlock(&smn_mutex); 211 212 out: 213 return err; 214 } 215 216 int amd_smn_read(u16 node, u32 address, u32 *value) 217 { 218 int err = __amd_smn_rw(node, address, value, false); 219 220 if (PCI_POSSIBLE_ERROR(*value)) { 221 err = -ENODEV; 222 *value = 0; 223 } 224 225 return err; 226 } 227 EXPORT_SYMBOL_GPL(amd_smn_read); 228 229 int amd_smn_write(u16 node, u32 address, u32 value) 230 { 231 return __amd_smn_rw(node, address, &value, true); 232 } 233 EXPORT_SYMBOL_GPL(amd_smn_write); 234 235 236 static int amd_cache_northbridges(void) 237 { 238 const struct pci_device_id *misc_ids = amd_nb_misc_ids; 239 const struct pci_device_id *link_ids = amd_nb_link_ids; 240 const struct pci_device_id *root_ids = amd_root_ids; 241 struct pci_dev *root, *misc, *link; 242 struct amd_northbridge *nb; 243 u16 roots_per_misc = 0; 244 u16 misc_count = 0; 245 u16 root_count = 0; 246 u16 i, j; 247 248 if (amd_northbridges.num) 249 return 0; 250 251 if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) { 252 root_ids = hygon_root_ids; 253 misc_ids = hygon_nb_misc_ids; 254 link_ids = hygon_nb_link_ids; 255 } 256 257 misc = NULL; 258 while ((misc = next_northbridge(misc, misc_ids))) 259 misc_count++; 260 261 if (!misc_count) 262 return -ENODEV; 263 264 root = NULL; 265 while ((root = next_northbridge(root, root_ids))) 266 root_count++; 267 268 if (root_count) { 269 roots_per_misc = root_count / misc_count; 270 271 /* 272 * There should be _exactly_ N roots for each DF/SMN 273 * interface. 274 */ 275 if (!roots_per_misc || (root_count % roots_per_misc)) { 276 pr_info("Unsupported AMD DF/PCI configuration found\n"); 277 return -ENODEV; 278 } 279 } 280 281 nb = kcalloc(misc_count, sizeof(struct amd_northbridge), GFP_KERNEL); 282 if (!nb) 283 return -ENOMEM; 284 285 amd_northbridges.nb = nb; 286 amd_northbridges.num = misc_count; 287 288 link = misc = root = NULL; 289 for (i = 0; i < amd_northbridges.num; i++) { 290 node_to_amd_nb(i)->root = root = 291 next_northbridge(root, root_ids); 292 node_to_amd_nb(i)->misc = misc = 293 next_northbridge(misc, misc_ids); 294 node_to_amd_nb(i)->link = link = 295 next_northbridge(link, link_ids); 296 297 /* 298 * If there are more PCI root devices than data fabric/ 299 * system management network interfaces, then the (N) 300 * PCI roots per DF/SMN interface are functionally the 301 * same (for DF/SMN access) and N-1 are redundant. N-1 302 * PCI roots should be skipped per DF/SMN interface so 303 * the following DF/SMN interfaces get mapped to 304 * correct PCI roots. 305 */ 306 for (j = 1; j < roots_per_misc; j++) 307 root = next_northbridge(root, root_ids); 308 } 309 310 if (amd_gart_present()) 311 amd_northbridges.flags |= AMD_NB_GART; 312 313 /* 314 * Check for L3 cache presence. 315 */ 316 if (!cpuid_edx(0x80000006)) 317 return 0; 318 319 /* 320 * Some CPU families support L3 Cache Index Disable. There are some 321 * limitations because of E382 and E388 on family 0x10. 322 */ 323 if (boot_cpu_data.x86 == 0x10 && 324 boot_cpu_data.x86_model >= 0x8 && 325 (boot_cpu_data.x86_model > 0x9 || 326 boot_cpu_data.x86_stepping >= 0x1)) 327 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE; 328 329 if (boot_cpu_data.x86 == 0x15) 330 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE; 331 332 /* L3 cache partitioning is supported on family 0x15 */ 333 if (boot_cpu_data.x86 == 0x15) 334 amd_northbridges.flags |= AMD_NB_L3_PARTITIONING; 335 336 return 0; 337 } 338 339 /* 340 * Ignores subdevice/subvendor but as far as I can figure out 341 * they're useless anyways 342 */ 343 bool __init early_is_amd_nb(u32 device) 344 { 345 const struct pci_device_id *misc_ids = amd_nb_misc_ids; 346 const struct pci_device_id *id; 347 u32 vendor = device & 0xffff; 348 349 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD && 350 boot_cpu_data.x86_vendor != X86_VENDOR_HYGON) 351 return false; 352 353 if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) 354 misc_ids = hygon_nb_misc_ids; 355 356 device >>= 16; 357 for (id = misc_ids; id->vendor; id++) 358 if (vendor == id->vendor && device == id->device) 359 return true; 360 return false; 361 } 362 363 struct resource *amd_get_mmconfig_range(struct resource *res) 364 { 365 u32 address; 366 u64 base, msr; 367 unsigned int segn_busn_bits; 368 369 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD && 370 boot_cpu_data.x86_vendor != X86_VENDOR_HYGON) 371 return NULL; 372 373 /* assume all cpus from fam10h have mmconfig */ 374 if (boot_cpu_data.x86 < 0x10) 375 return NULL; 376 377 address = MSR_FAM10H_MMIO_CONF_BASE; 378 rdmsrl(address, msr); 379 380 /* mmconfig is not enabled */ 381 if (!(msr & FAM10H_MMIO_CONF_ENABLE)) 382 return NULL; 383 384 base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT); 385 386 segn_busn_bits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) & 387 FAM10H_MMIO_CONF_BUSRANGE_MASK; 388 389 res->flags = IORESOURCE_MEM; 390 res->start = base; 391 res->end = base + (1ULL<<(segn_busn_bits + 20)) - 1; 392 return res; 393 } 394 395 int amd_get_subcaches(int cpu) 396 { 397 struct pci_dev *link = node_to_amd_nb(topology_amd_node_id(cpu))->link; 398 unsigned int mask; 399 400 if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING)) 401 return 0; 402 403 pci_read_config_dword(link, 0x1d4, &mask); 404 405 return (mask >> (4 * cpu_data(cpu).topo.core_id)) & 0xf; 406 } 407 408 int amd_set_subcaches(int cpu, unsigned long mask) 409 { 410 static unsigned int reset, ban; 411 struct amd_northbridge *nb = node_to_amd_nb(topology_amd_node_id(cpu)); 412 unsigned int reg; 413 int cuid; 414 415 if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING) || mask > 0xf) 416 return -EINVAL; 417 418 /* if necessary, collect reset state of L3 partitioning and BAN mode */ 419 if (reset == 0) { 420 pci_read_config_dword(nb->link, 0x1d4, &reset); 421 pci_read_config_dword(nb->misc, 0x1b8, &ban); 422 ban &= 0x180000; 423 } 424 425 /* deactivate BAN mode if any subcaches are to be disabled */ 426 if (mask != 0xf) { 427 pci_read_config_dword(nb->misc, 0x1b8, ®); 428 pci_write_config_dword(nb->misc, 0x1b8, reg & ~0x180000); 429 } 430 431 cuid = cpu_data(cpu).topo.core_id; 432 mask <<= 4 * cuid; 433 mask |= (0xf ^ (1 << cuid)) << 26; 434 435 pci_write_config_dword(nb->link, 0x1d4, mask); 436 437 /* reset BAN mode if L3 partitioning returned to reset state */ 438 pci_read_config_dword(nb->link, 0x1d4, ®); 439 if (reg == reset) { 440 pci_read_config_dword(nb->misc, 0x1b8, ®); 441 reg &= ~0x180000; 442 pci_write_config_dword(nb->misc, 0x1b8, reg | ban); 443 } 444 445 return 0; 446 } 447 448 static void amd_cache_gart(void) 449 { 450 u16 i; 451 452 if (!amd_nb_has_feature(AMD_NB_GART)) 453 return; 454 455 flush_words = kmalloc_array(amd_northbridges.num, sizeof(u32), GFP_KERNEL); 456 if (!flush_words) { 457 amd_northbridges.flags &= ~AMD_NB_GART; 458 pr_notice("Cannot initialize GART flush words, GART support disabled\n"); 459 return; 460 } 461 462 for (i = 0; i != amd_northbridges.num; i++) 463 pci_read_config_dword(node_to_amd_nb(i)->misc, 0x9c, &flush_words[i]); 464 } 465 466 void amd_flush_garts(void) 467 { 468 int flushed, i; 469 unsigned long flags; 470 static DEFINE_SPINLOCK(gart_lock); 471 472 if (!amd_nb_has_feature(AMD_NB_GART)) 473 return; 474 475 /* 476 * Avoid races between AGP and IOMMU. In theory it's not needed 477 * but I'm not sure if the hardware won't lose flush requests 478 * when another is pending. This whole thing is so expensive anyways 479 * that it doesn't matter to serialize more. -AK 480 */ 481 spin_lock_irqsave(&gart_lock, flags); 482 flushed = 0; 483 for (i = 0; i < amd_northbridges.num; i++) { 484 pci_write_config_dword(node_to_amd_nb(i)->misc, 0x9c, 485 flush_words[i] | 1); 486 flushed++; 487 } 488 for (i = 0; i < amd_northbridges.num; i++) { 489 u32 w; 490 /* Make sure the hardware actually executed the flush*/ 491 for (;;) { 492 pci_read_config_dword(node_to_amd_nb(i)->misc, 493 0x9c, &w); 494 if (!(w & 1)) 495 break; 496 cpu_relax(); 497 } 498 } 499 spin_unlock_irqrestore(&gart_lock, flags); 500 if (!flushed) 501 pr_notice("nothing to flush?\n"); 502 } 503 EXPORT_SYMBOL_GPL(amd_flush_garts); 504 505 static void __fix_erratum_688(void *info) 506 { 507 #define MSR_AMD64_IC_CFG 0xC0011021 508 509 msr_set_bit(MSR_AMD64_IC_CFG, 3); 510 msr_set_bit(MSR_AMD64_IC_CFG, 14); 511 } 512 513 /* Apply erratum 688 fix so machines without a BIOS fix work. */ 514 static __init void fix_erratum_688(void) 515 { 516 struct pci_dev *F4; 517 u32 val; 518 519 if (boot_cpu_data.x86 != 0x14) 520 return; 521 522 if (!amd_northbridges.num) 523 return; 524 525 F4 = node_to_amd_nb(0)->link; 526 if (!F4) 527 return; 528 529 if (pci_read_config_dword(F4, 0x164, &val)) 530 return; 531 532 if (val & BIT(2)) 533 return; 534 535 on_each_cpu(__fix_erratum_688, NULL, 0); 536 537 pr_info("x86/cpu/AMD: CPU erratum 688 worked around\n"); 538 } 539 540 static __init int init_amd_nbs(void) 541 { 542 amd_cache_northbridges(); 543 amd_cache_gart(); 544 545 fix_erratum_688(); 546 547 return 0; 548 } 549 550 /* This has to go after the PCI subsystem */ 551 fs_initcall(init_amd_nbs); 552