arch/x86/kernel/amd_nb.c

   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_1AH_M60H_ROOT         0x1122
  30 #define PCI_DEVICE_ID_AMD_MI200_ROOT            0x14bb
  31 #define PCI_DEVICE_ID_AMD_MI300_ROOT            0x14f8
  32
  33 #define PCI_DEVICE_ID_AMD_17H_DF_F4             0x1464
  34 #define PCI_DEVICE_ID_AMD_17H_M10H_DF_F4        0x15ec
  35 #define PCI_DEVICE_ID_AMD_17H_M30H_DF_F4        0x1494
  36 #define PCI_DEVICE_ID_AMD_17H_M60H_DF_F4        0x144c
  37 #define PCI_DEVICE_ID_AMD_17H_M70H_DF_F4        0x1444
  38 #define PCI_DEVICE_ID_AMD_17H_MA0H_DF_F4        0x1728
  39 #define PCI_DEVICE_ID_AMD_19H_DF_F4             0x1654
  40 #define PCI_DEVICE_ID_AMD_19H_M10H_DF_F4        0x14b1
  41 #define PCI_DEVICE_ID_AMD_19H_M40H_DF_F4        0x167d
  42 #define PCI_DEVICE_ID_AMD_19H_M50H_DF_F4        0x166e
  43 #define PCI_DEVICE_ID_AMD_19H_M60H_DF_F4        0x14e4
  44 #define PCI_DEVICE_ID_AMD_19H_M70H_DF_F4        0x14f4
  45 #define PCI_DEVICE_ID_AMD_19H_M78H_DF_F4        0x12fc
  46 #define PCI_DEVICE_ID_AMD_1AH_M00H_DF_F4        0x12c4
  47 #define PCI_DEVICE_ID_AMD_1AH_M20H_DF_F4        0x16fc
  48 #define PCI_DEVICE_ID_AMD_1AH_M60H_DF_F4        0x124c
  49 #define PCI_DEVICE_ID_AMD_1AH_M70H_DF_F4        0x12bc
  50 #define PCI_DEVICE_ID_AMD_MI200_DF_F4           0x14d4
  51 #define PCI_DEVICE_ID_AMD_MI300_DF_F4           0x152c
  52
  53 /* Protect the PCI config register pairs used for SMN. */
  54 static DEFINE_MUTEX(smn_mutex);
  55
  56 static u32 *flush_words;
  57
  58 static const struct pci_device_id amd_root_ids[] = {
  59         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_ROOT) },
  60         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_ROOT) },
  61         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_ROOT) },
  62         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_ROOT) },
  63         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_MA0H_ROOT) },
  64         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M10H_ROOT) },
  65         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_ROOT) },
  66         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M60H_ROOT) },
  67         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M70H_ROOT) },
  68         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M00H_ROOT) },
  69         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M20H_ROOT) },
  70         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M60H_ROOT) },
  71         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI200_ROOT) },
  72         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI300_ROOT) },
  73         {}
  74 };
  75
  76 #define PCI_DEVICE_ID_AMD_CNB17H_F4     0x1704
  77
  78 static const struct pci_device_id amd_nb_misc_ids[] = {
  79         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
  80         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
  81         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
  82         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
  83         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) },
  84         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F3) },
  85         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
  86         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F3) },
  87         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_DF_F3) },
  88         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_DF_F3) },
  89         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_DF_F3) },
  90         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_DF_F3) },
  91         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_MA0H_DF_F3) },
  92         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
  93         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F3) },
  94         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F3) },
  95         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M10H_DF_F3) },
  96         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F3) },
  97         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F3) },
  98         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M60H_DF_F3) },
  99         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M70H_DF_F3) },
 100         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M78H_DF_F3) },
 101         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M00H_DF_F3) },
 102         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M20H_DF_F3) },
 103         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M60H_DF_F3) },
 104         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M70H_DF_F3) },
 105         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI200_DF_F3) },
 106         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI300_DF_F3) },
 107         {}
 108 };
 109
 110 static const struct pci_device_id amd_nb_link_ids[] = {
 111         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
 112         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },
 113         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F4) },
 114         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
 115         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F4) },
 116         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_DF_F4) },
 117         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_DF_F4) },
 118         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M30H_DF_F4) },
 119         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M60H_DF_F4) },
 120         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M70H_DF_F4) },
 121         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_MA0H_DF_F4) },
 122         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F4) },
 123         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M10H_DF_F4) },
 124         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M40H_DF_F4) },
 125         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M50H_DF_F4) },
 126         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M60H_DF_F4) },
 127         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M70H_DF_F4) },
 128         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_M78H_DF_F4) },
 129         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F4) },
 130         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M00H_DF_F4) },
 131         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M20H_DF_F4) },
 132         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M60H_DF_F4) },
 133         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_1AH_M70H_DF_F4) },
 134         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI200_DF_F4) },
 135         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_MI300_DF_F4) },
 136         {}
 137 };
 138
 139 static const struct pci_device_id hygon_root_ids[] = {
 140         { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_ROOT) },
 141         {}
 142 };
 143
 144 static const struct pci_device_id hygon_nb_misc_ids[] = {
 145         { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_DF_F3) },
 146         {}
 147 };
 148
 149 static const struct pci_device_id hygon_nb_link_ids[] = {
 150         { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_17H_DF_F4) },
 151         {}
 152 };
 153
 154 const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[] __initconst = {
 155         { 0x00, 0x18, 0x20 },
 156         { 0xff, 0x00, 0x20 },
 157         { 0xfe, 0x00, 0x20 },
 158         { }
 159 };
 160
 161 static struct amd_northbridge_info amd_northbridges;
 162
 163 u16 amd_nb_num(void)
 164 {
 165         return amd_northbridges.num;
 166 }
 167 EXPORT_SYMBOL_GPL(amd_nb_num);
 168
 169 bool amd_nb_has_feature(unsigned int feature)
 170 {
 171         return ((amd_northbridges.flags & feature) == feature);
 172 }
 173 EXPORT_SYMBOL_GPL(amd_nb_has_feature);
 174
 175 struct amd_northbridge *node_to_amd_nb(int node)
 176 {
 177         return (node < amd_northbridges.num) ? &amd_northbridges.nb[node] : NULL;
 178 }
 179 EXPORT_SYMBOL_GPL(node_to_amd_nb);
 180
 181 static struct pci_dev *next_northbridge(struct pci_dev *dev,
 182                                         const struct pci_device_id *ids)
 183 {
 184         do {
 185                 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
 186                 if (!dev)
 187                         break;
 188         } while (!pci_match_id(ids, dev));
 189         return dev;
 190 }
 191
 192 /*
 193  * SMN accesses may fail in ways that are difficult to detect here in the called
 194  * functions amd_smn_read() and amd_smn_write(). Therefore, callers must do
 195  * their own checking based on what behavior they expect.
 196  *
 197  * For SMN reads, the returned value may be zero if the register is Read-as-Zero.
 198  * Or it may be a "PCI Error Response", e.g. all 0xFFs. The "PCI Error Response"
 199  * can be checked here, and a proper error code can be returned.
 200  *
 201  * But the Read-as-Zero response cannot be verified here. A value of 0 may be
 202  * correct in some cases, so callers must check that this correct is for the
 203  * register/fields they need.
 204  *
 205  * For SMN writes, success can be determined through a "write and read back"
 206  * However, this is not robust when done here.
 207  *
 208  * Possible issues:
 209  *
 210  * 1) Bits that are "Write-1-to-Clear". In this case, the read value should
 211  *    *not* match the write value.
 212  *
 213  * 2) Bits that are "Read-as-Zero"/"Writes-Ignored". This information cannot be
 214  *    known here.
 215  *
 216  * 3) Bits that are "Reserved / Set to 1". Ditto above.
 217  *
 218  * Callers of amd_smn_write() should do the "write and read back" check
 219  * themselves, if needed.
 220  *
 221  * For #1, they can see if their target bits got cleared.
 222  *
 223  * For #2 and #3, they can check if their target bits got set as intended.
 224  *
 225  * This matches what is done for RDMSR/WRMSR. As long as there's no #GP, then
 226  * the operation is considered a success, and the caller does their own
 227  * checking.
 228  */
 229 static int __amd_smn_rw(u16 node, u32 address, u32 *value, bool write)
 230 {
 231         struct pci_dev *root;
 232         int err = -ENODEV;
 233
 234         if (node >= amd_northbridges.num)
 235                 goto out;
 236
 237         root = node_to_amd_nb(node)->root;
 238         if (!root)
 239                 goto out;
 240
 241         mutex_lock(&smn_mutex);
 242
 243         err = pci_write_config_dword(root, 0x60, address);
 244         if (err) {
 245                 pr_warn("Error programming SMN address 0x%x.\n", address);
 246                 goto out_unlock;
 247         }
 248
 249         err = (write ? pci_write_config_dword(root, 0x64, *value)
 250                      : pci_read_config_dword(root, 0x64, value));
 251
 252 out_unlock:
 253         mutex_unlock(&smn_mutex);
 254
 255 out:
 256         return err;
 257 }
 258
 259 int __must_check amd_smn_read(u16 node, u32 address, u32 *value)
 260 {
 261         int err = __amd_smn_rw(node, address, value, false);
 262
 263         if (PCI_POSSIBLE_ERROR(*value)) {
 264                 err = -ENODEV;
 265                 *value = 0;
 266         }
 267
 268         return err;
 269 }
 270 EXPORT_SYMBOL_GPL(amd_smn_read);
 271
 272 int __must_check amd_smn_write(u16 node, u32 address, u32 value)
 273 {
 274         return __amd_smn_rw(node, address, &value, true);
 275 }
 276 EXPORT_SYMBOL_GPL(amd_smn_write);
 277
 278
 279 static int amd_cache_northbridges(void)
 280 {
 281         const struct pci_device_id *misc_ids = amd_nb_misc_ids;
 282         const struct pci_device_id *link_ids = amd_nb_link_ids;
 283         const struct pci_device_id *root_ids = amd_root_ids;
 284         struct pci_dev *root, *misc, *link;
 285         struct amd_northbridge *nb;
 286         u16 roots_per_misc = 0;
 287         u16 misc_count = 0;
 288         u16 root_count = 0;
 289         u16 i, j;
 290
 291         if (amd_northbridges.num)
 292                 return 0;
 293
 294         if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON) {
 295                 root_ids = hygon_root_ids;
 296                 misc_ids = hygon_nb_misc_ids;
 297                 link_ids = hygon_nb_link_ids;
 298         }
 299
 300         misc = NULL;
 301         while ((misc = next_northbridge(misc, misc_ids)))
 302                 misc_count++;
 303
 304         if (!misc_count)
 305                 return -ENODEV;
 306
 307         root = NULL;
 308         while ((root = next_northbridge(root, root_ids)))
 309                 root_count++;
 310
 311         if (root_count) {
 312                 roots_per_misc = root_count / misc_count;
 313
 314                 /*
 315                  * There should be _exactly_ N roots for each DF/SMN
 316                  * interface.
 317                  */
 318                 if (!roots_per_misc || (root_count % roots_per_misc)) {
 319                         pr_info("Unsupported AMD DF/PCI configuration found\n");
 320                         return -ENODEV;
 321                 }
 322         }
 323
 324         nb = kcalloc(misc_count, sizeof(struct amd_northbridge), GFP_KERNEL);
 325         if (!nb)
 326                 return -ENOMEM;
 327
 328         amd_northbridges.nb = nb;
 329         amd_northbridges.num = misc_count;
 330
 331         link = misc = root = NULL;
 332         for (i = 0; i < amd_northbridges.num; i++) {
 333                 node_to_amd_nb(i)->root = root =
 334                         next_northbridge(root, root_ids);
 335                 node_to_amd_nb(i)->misc = misc =
 336                         next_northbridge(misc, misc_ids);
 337                 node_to_amd_nb(i)->link = link =
 338                         next_northbridge(link, link_ids);
 339
 340                 /*
 341                  * If there are more PCI root devices than data fabric/
 342                  * system management network interfaces, then the (N)
 343                  * PCI roots per DF/SMN interface are functionally the
 344                  * same (for DF/SMN access) and N-1 are redundant.  N-1
 345                  * PCI roots should be skipped per DF/SMN interface so
 346                  * the following DF/SMN interfaces get mapped to
 347                  * correct PCI roots.
 348                  */
 349                 for (j = 1; j < roots_per_misc; j++)
 350                         root = next_northbridge(root, root_ids);
 351         }
 352
 353         if (amd_gart_present())
 354                 amd_northbridges.flags |= AMD_NB_GART;
 355
 356         /*
 357          * Check for L3 cache presence.
 358          */
 359         if (!cpuid_edx(0x80000006))
 360                 return 0;
 361
 362         /*
 363          * Some CPU families support L3 Cache Index Disable. There are some
 364          * limitations because of E382 and E388 on family 0x10.
 365          */
 366         if (boot_cpu_data.x86 == 0x10 &&
 367             boot_cpu_data.x86_model >= 0x8 &&
 368             (boot_cpu_data.x86_model > 0x9 ||
 369              boot_cpu_data.x86_stepping >= 0x1))
 370                 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
 371
 372         if (boot_cpu_data.x86 == 0x15)
 373                 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
 374
 375         /* L3 cache partitioning is supported on family 0x15 */
 376         if (boot_cpu_data.x86 == 0x15)
 377                 amd_northbridges.flags |= AMD_NB_L3_PARTITIONING;
 378
 379         return 0;
 380 }
 381
 382 /*
 383  * Ignores subdevice/subvendor but as far as I can figure out
 384  * they're useless anyways
 385  */
 386 bool __init early_is_amd_nb(u32 device)
 387 {
 388         const struct pci_device_id *misc_ids = amd_nb_misc_ids;
 389         const struct pci_device_id *id;
 390         u32 vendor = device & 0xffff;
 391
 392         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
 393             boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
 394                 return false;
 395
 396         if (boot_cpu_data.x86_vendor == X86_VENDOR_HYGON)
 397                 misc_ids = hygon_nb_misc_ids;
 398
 399         device >>= 16;
 400         for (id = misc_ids; id->vendor; id++)
 401                 if (vendor == id->vendor && device == id->device)
 402                         return true;
 403         return false;
 404 }
 405
 406 struct resource *amd_get_mmconfig_range(struct resource *res)
 407 {
 408         u32 address;
 409         u64 base, msr;
 410         unsigned int segn_busn_bits;
 411
 412         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
 413             boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
 414                 return NULL;
 415
 416         /* assume all cpus from fam10h have mmconfig */
 417         if (boot_cpu_data.x86 < 0x10)
 418                 return NULL;
 419
 420         address = MSR_FAM10H_MMIO_CONF_BASE;
 421         rdmsrl(address, msr);
 422
 423         /* mmconfig is not enabled */
 424         if (!(msr & FAM10H_MMIO_CONF_ENABLE))
 425                 return NULL;
 426
 427         base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);
 428
 429         segn_busn_bits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
 430                          FAM10H_MMIO_CONF_BUSRANGE_MASK;
 431
 432         res->flags = IORESOURCE_MEM;
 433         res->start = base;
 434         res->end = base + (1ULL<<(segn_busn_bits + 20)) - 1;
 435         return res;
 436 }
 437
 438 int amd_get_subcaches(int cpu)
 439 {
 440         struct pci_dev *link = node_to_amd_nb(topology_amd_node_id(cpu))->link;
 441         unsigned int mask;
 442
 443         if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
 444                 return 0;
 445
 446         pci_read_config_dword(link, 0x1d4, &mask);
 447
 448         return (mask >> (4 * cpu_data(cpu).topo.core_id)) & 0xf;
 449 }
 450
 451 int amd_set_subcaches(int cpu, unsigned long mask)
 452 {
 453         static unsigned int reset, ban;
 454         struct amd_northbridge *nb = node_to_amd_nb(topology_amd_node_id(cpu));
 455         unsigned int reg;
 456         int cuid;
 457
 458         if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING) || mask > 0xf)
 459                 return -EINVAL;
 460
 461         /* if necessary, collect reset state of L3 partitioning and BAN mode */
 462         if (reset == 0) {
 463                 pci_read_config_dword(nb->link, 0x1d4, &reset);
 464                 pci_read_config_dword(nb->misc, 0x1b8, &ban);
 465                 ban &= 0x180000;
 466         }
 467
 468         /* deactivate BAN mode if any subcaches are to be disabled */
 469         if (mask != 0xf) {
 470                 pci_read_config_dword(nb->misc, 0x1b8, &reg);
 471                 pci_write_config_dword(nb->misc, 0x1b8, reg & ~0x180000);
 472         }
 473
 474         cuid = cpu_data(cpu).topo.core_id;
 475         mask <<= 4 * cuid;
 476         mask |= (0xf ^ (1 << cuid)) << 26;
 477
 478         pci_write_config_dword(nb->link, 0x1d4, mask);
 479
 480         /* reset BAN mode if L3 partitioning returned to reset state */
 481         pci_read_config_dword(nb->link, 0x1d4, &reg);
 482         if (reg == reset) {
 483                 pci_read_config_dword(nb->misc, 0x1b8, &reg);
 484                 reg &= ~0x180000;
 485                 pci_write_config_dword(nb->misc, 0x1b8, reg | ban);
 486         }
 487
 488         return 0;
 489 }
 490
 491 static void amd_cache_gart(void)
 492 {
 493         u16 i;
 494
 495         if (!amd_nb_has_feature(AMD_NB_GART))
 496                 return;
 497
 498         flush_words = kmalloc_array(amd_northbridges.num, sizeof(u32), GFP_KERNEL);
 499         if (!flush_words) {
 500                 amd_northbridges.flags &= ~AMD_NB_GART;
 501                 pr_notice("Cannot initialize GART flush words, GART support disabled\n");
 502                 return;
 503         }
 504
 505         for (i = 0; i != amd_northbridges.num; i++)
 506                 pci_read_config_dword(node_to_amd_nb(i)->misc, 0x9c, &flush_words[i]);
 507 }
 508
 509 void amd_flush_garts(void)
 510 {
 511         int flushed, i;
 512         unsigned long flags;
 513         static DEFINE_SPINLOCK(gart_lock);
 514
 515         if (!amd_nb_has_feature(AMD_NB_GART))
 516                 return;
 517
 518         /*
 519          * Avoid races between AGP and IOMMU. In theory it's not needed
 520          * but I'm not sure if the hardware won't lose flush requests
 521          * when another is pending. This whole thing is so expensive anyways
 522          * that it doesn't matter to serialize more. -AK
 523          */
 524         spin_lock_irqsave(&gart_lock, flags);
 525         flushed = 0;
 526         for (i = 0; i < amd_northbridges.num; i++) {
 527                 pci_write_config_dword(node_to_amd_nb(i)->misc, 0x9c,
 528                                        flush_words[i] | 1);
 529                 flushed++;
 530         }
 531         for (i = 0; i < amd_northbridges.num; i++) {
 532                 u32 w;
 533                 /* Make sure the hardware actually executed the flush*/
 534                 for (;;) {
 535                         pci_read_config_dword(node_to_amd_nb(i)->misc,
 536                                               0x9c, &w);
 537                         if (!(w & 1))
 538                                 break;
 539                         cpu_relax();
 540                 }
 541         }
 542         spin_unlock_irqrestore(&gart_lock, flags);
 543         if (!flushed)
 544                 pr_notice("nothing to flush?\n");
 545 }
 546 EXPORT_SYMBOL_GPL(amd_flush_garts);
 547
 548 static void __fix_erratum_688(void *info)
 549 {
 550 #define MSR_AMD64_IC_CFG 0xC0011021
 551
 552         msr_set_bit(MSR_AMD64_IC_CFG, 3);
 553         msr_set_bit(MSR_AMD64_IC_CFG, 14);
 554 }
 555
 556 /* Apply erratum 688 fix so machines without a BIOS fix work. */
 557 static __init void fix_erratum_688(void)
 558 {
 559         struct pci_dev *F4;
 560         u32 val;
 561
 562         if (boot_cpu_data.x86 != 0x14)
 563                 return;
 564
 565         if (!amd_northbridges.num)
 566                 return;
 567
 568         F4 = node_to_amd_nb(0)->link;
 569         if (!F4)
 570                 return;
 571
 572         if (pci_read_config_dword(F4, 0x164, &val))
 573                 return;
 574
 575         if (val & BIT(2))
 576                 return;
 577
 578         on_each_cpu(__fix_erratum_688, NULL, 0);
 579
 580         pr_info("x86/cpu/AMD: CPU erratum 688 worked around\n");
 581 }
 582
 583 static __init int init_amd_nbs(void)
 584 {
 585         amd_cache_northbridges();
 586         amd_cache_gart();
 587
 588         fix_erratum_688();
 589
 590         return 0;
 591 }
 592
 593 /* This has to go after the PCI subsystem */
 594 fs_initcall(init_amd_nbs);