arch/x86/kernel/amd_nb.c

   1 /*
   2  * Shared support code for AMD K8 northbridges and derivates.
   3  * Copyright 2006 Andi Kleen, SUSE Labs. Subject to GPLv2.
   4  */
   5
   6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   7
   8 #include <linux/types.h>
   9 #include <linux/slab.h>
  10 #include <linux/init.h>
  11 #include <linux/errno.h>
  12 #include <linux/export.h>
  13 #include <linux/spinlock.h>
  14 #include <asm/amd_nb.h>
  15
  16 #define PCI_DEVICE_ID_AMD_17H_ROOT      0x1450
  17 #define PCI_DEVICE_ID_AMD_17H_M10H_ROOT 0x15d0
  18 #define PCI_DEVICE_ID_AMD_17H_DF_F3     0x1463
  19 #define PCI_DEVICE_ID_AMD_17H_DF_F4     0x1464
  20 #define PCI_DEVICE_ID_AMD_17H_M10H_DF_F3 0x15eb
  21 #define PCI_DEVICE_ID_AMD_17H_M10H_DF_F4 0x15ec
  22
  23 /* Protect the PCI config register pairs used for SMN and DF indirect access. */
  24 static DEFINE_MUTEX(smn_mutex);
  25
  26 static u32 *flush_words;
  27
  28 static const struct pci_device_id amd_root_ids[] = {
  29         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_ROOT) },
  30         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_ROOT) },
  31         {}
  32 };
  33
  34 #define PCI_DEVICE_ID_AMD_CNB17H_F4     0x1704
  35
  36 const struct pci_device_id amd_nb_misc_ids[] = {
  37         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
  38         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
  39         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
  40         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
  41         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) },
  42         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F3) },
  43         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
  44         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F3) },
  45         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_DF_F3) },
  46         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_DF_F3) },
  47         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
  48         {}
  49 };
  50 EXPORT_SYMBOL_GPL(amd_nb_misc_ids);
  51
  52 static const struct pci_device_id amd_nb_link_ids[] = {
  53         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
  54         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },
  55         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F4) },
  56         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
  57         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F4) },
  58         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_DF_F4) },
  59         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_M10H_DF_F4) },
  60         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F4) },
  61         {}
  62 };
  63
  64 const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[] __initconst = {
  65         { 0x00, 0x18, 0x20 },
  66         { 0xff, 0x00, 0x20 },
  67         { 0xfe, 0x00, 0x20 },
  68         { }
  69 };
  70
  71 static struct amd_northbridge_info amd_northbridges;
  72
  73 u16 amd_nb_num(void)
  74 {
  75         return amd_northbridges.num;
  76 }
  77 EXPORT_SYMBOL_GPL(amd_nb_num);
  78
  79 bool amd_nb_has_feature(unsigned int feature)
  80 {
  81         return ((amd_northbridges.flags & feature) == feature);
  82 }
  83 EXPORT_SYMBOL_GPL(amd_nb_has_feature);
  84
  85 struct amd_northbridge *node_to_amd_nb(int node)
  86 {
  87         return (node < amd_northbridges.num) ? &amd_northbridges.nb[node] : NULL;
  88 }
  89 EXPORT_SYMBOL_GPL(node_to_amd_nb);
  90
  91 static struct pci_dev *next_northbridge(struct pci_dev *dev,
  92                                         const struct pci_device_id *ids)
  93 {
  94         do {
  95                 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
  96                 if (!dev)
  97                         break;
  98         } while (!pci_match_id(ids, dev));
  99         return dev;
 100 }
 101
 102 static int __amd_smn_rw(u16 node, u32 address, u32 *value, bool write)
 103 {
 104         struct pci_dev *root;
 105         int err = -ENODEV;
 106
 107         if (node >= amd_northbridges.num)
 108                 goto out;
 109
 110         root = node_to_amd_nb(node)->root;
 111         if (!root)
 112                 goto out;
 113
 114         mutex_lock(&smn_mutex);
 115
 116         err = pci_write_config_dword(root, 0x60, address);
 117         if (err) {
 118                 pr_warn("Error programming SMN address 0x%x.\n", address);
 119                 goto out_unlock;
 120         }
 121
 122         err = (write ? pci_write_config_dword(root, 0x64, *value)
 123                      : pci_read_config_dword(root, 0x64, value));
 124         if (err)
 125                 pr_warn("Error %s SMN address 0x%x.\n",
 126                         (write ? "writing to" : "reading from"), address);
 127
 128 out_unlock:
 129         mutex_unlock(&smn_mutex);
 130
 131 out:
 132         return err;
 133 }
 134
 135 int amd_smn_read(u16 node, u32 address, u32 *value)
 136 {
 137         return __amd_smn_rw(node, address, value, false);
 138 }
 139 EXPORT_SYMBOL_GPL(amd_smn_read);
 140
 141 int amd_smn_write(u16 node, u32 address, u32 value)
 142 {
 143         return __amd_smn_rw(node, address, &value, true);
 144 }
 145 EXPORT_SYMBOL_GPL(amd_smn_write);
 146
 147 /*
 148  * Data Fabric Indirect Access uses FICAA/FICAD.
 149  *
 150  * Fabric Indirect Configuration Access Address (FICAA): Constructed based
 151  * on the device's Instance Id and the PCI function and register offset of
 152  * the desired register.
 153  *
 154  * Fabric Indirect Configuration Access Data (FICAD): There are FICAD LO
 155  * and FICAD HI registers but so far we only need the LO register.
 156  */
 157 int amd_df_indirect_read(u16 node, u8 func, u16 reg, u8 instance_id, u32 *lo)
 158 {
 159         struct pci_dev *F4;
 160         u32 ficaa;
 161         int err = -ENODEV;
 162
 163         if (node >= amd_northbridges.num)
 164                 goto out;
 165
 166         F4 = node_to_amd_nb(node)->link;
 167         if (!F4)
 168                 goto out;
 169
 170         ficaa  = 1;
 171         ficaa |= reg & 0x3FC;
 172         ficaa |= (func & 0x7) << 11;
 173         ficaa |= instance_id << 16;
 174
 175         mutex_lock(&smn_mutex);
 176
 177         err = pci_write_config_dword(F4, 0x5C, ficaa);
 178         if (err) {
 179                 pr_warn("Error writing DF Indirect FICAA, FICAA=0x%x\n", ficaa);
 180                 goto out_unlock;
 181         }
 182
 183         err = pci_read_config_dword(F4, 0x98, lo);
 184         if (err)
 185                 pr_warn("Error reading DF Indirect FICAD LO, FICAA=0x%x.\n", ficaa);
 186
 187 out_unlock:
 188         mutex_unlock(&smn_mutex);
 189
 190 out:
 191         return err;
 192 }
 193 EXPORT_SYMBOL_GPL(amd_df_indirect_read);
 194
 195 int amd_cache_northbridges(void)
 196 {
 197         u16 i = 0;
 198         struct amd_northbridge *nb;
 199         struct pci_dev *root, *misc, *link;
 200
 201         if (amd_northbridges.num)
 202                 return 0;
 203
 204         misc = NULL;
 205         while ((misc = next_northbridge(misc, amd_nb_misc_ids)) != NULL)
 206                 i++;
 207
 208         if (!i)
 209                 return -ENODEV;
 210
 211         nb = kcalloc(i, sizeof(struct amd_northbridge), GFP_KERNEL);
 212         if (!nb)
 213                 return -ENOMEM;
 214
 215         amd_northbridges.nb = nb;
 216         amd_northbridges.num = i;
 217
 218         link = misc = root = NULL;
 219         for (i = 0; i != amd_northbridges.num; i++) {
 220                 node_to_amd_nb(i)->root = root =
 221                         next_northbridge(root, amd_root_ids);
 222                 node_to_amd_nb(i)->misc = misc =
 223                         next_northbridge(misc, amd_nb_misc_ids);
 224                 node_to_amd_nb(i)->link = link =
 225                         next_northbridge(link, amd_nb_link_ids);
 226         }
 227
 228         if (amd_gart_present())
 229                 amd_northbridges.flags |= AMD_NB_GART;
 230
 231         /*
 232          * Check for L3 cache presence.
 233          */
 234         if (!cpuid_edx(0x80000006))
 235                 return 0;
 236
 237         /*
 238          * Some CPU families support L3 Cache Index Disable. There are some
 239          * limitations because of E382 and E388 on family 0x10.
 240          */
 241         if (boot_cpu_data.x86 == 0x10 &&
 242             boot_cpu_data.x86_model >= 0x8 &&
 243             (boot_cpu_data.x86_model > 0x9 ||
 244              boot_cpu_data.x86_stepping >= 0x1))
 245                 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
 246
 247         if (boot_cpu_data.x86 == 0x15)
 248                 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
 249
 250         /* L3 cache partitioning is supported on family 0x15 */
 251         if (boot_cpu_data.x86 == 0x15)
 252                 amd_northbridges.flags |= AMD_NB_L3_PARTITIONING;
 253
 254         return 0;
 255 }
 256 EXPORT_SYMBOL_GPL(amd_cache_northbridges);
 257
 258 /*
 259  * Ignores subdevice/subvendor but as far as I can figure out
 260  * they're useless anyways
 261  */
 262 bool __init early_is_amd_nb(u32 device)
 263 {
 264         const struct pci_device_id *id;
 265         u32 vendor = device & 0xffff;
 266
 267         device >>= 16;
 268         for (id = amd_nb_misc_ids; id->vendor; id++)
 269                 if (vendor == id->vendor && device == id->device)
 270                         return true;
 271         return false;
 272 }
 273
 274 struct resource *amd_get_mmconfig_range(struct resource *res)
 275 {
 276         u32 address;
 277         u64 base, msr;
 278         unsigned int segn_busn_bits;
 279
 280         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 281                 return NULL;
 282
 283         /* assume all cpus from fam10h have mmconfig */
 284         if (boot_cpu_data.x86 < 0x10)
 285                 return NULL;
 286
 287         address = MSR_FAM10H_MMIO_CONF_BASE;
 288         rdmsrl(address, msr);
 289
 290         /* mmconfig is not enabled */
 291         if (!(msr & FAM10H_MMIO_CONF_ENABLE))
 292                 return NULL;
 293
 294         base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);
 295
 296         segn_busn_bits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
 297                          FAM10H_MMIO_CONF_BUSRANGE_MASK;
 298
 299         res->flags = IORESOURCE_MEM;
 300         res->start = base;
 301         res->end = base + (1ULL<<(segn_busn_bits + 20)) - 1;
 302         return res;
 303 }
 304
 305 int amd_get_subcaches(int cpu)
 306 {
 307         struct pci_dev *link = node_to_amd_nb(amd_get_nb_id(cpu))->link;
 308         unsigned int mask;
 309
 310         if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
 311                 return 0;
 312
 313         pci_read_config_dword(link, 0x1d4, &mask);
 314
 315         return (mask >> (4 * cpu_data(cpu).cpu_core_id)) & 0xf;
 316 }
 317
 318 int amd_set_subcaches(int cpu, unsigned long mask)
 319 {
 320         static unsigned int reset, ban;
 321         struct amd_northbridge *nb = node_to_amd_nb(amd_get_nb_id(cpu));
 322         unsigned int reg;
 323         int cuid;
 324
 325         if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING) || mask > 0xf)
 326                 return -EINVAL;
 327
 328         /* if necessary, collect reset state of L3 partitioning and BAN mode */
 329         if (reset == 0) {
 330                 pci_read_config_dword(nb->link, 0x1d4, &reset);
 331                 pci_read_config_dword(nb->misc, 0x1b8, &ban);
 332                 ban &= 0x180000;
 333         }
 334
 335         /* deactivate BAN mode if any subcaches are to be disabled */
 336         if (mask != 0xf) {
 337                 pci_read_config_dword(nb->misc, 0x1b8, &reg);
 338                 pci_write_config_dword(nb->misc, 0x1b8, reg & ~0x180000);
 339         }
 340
 341         cuid = cpu_data(cpu).cpu_core_id;
 342         mask <<= 4 * cuid;
 343         mask |= (0xf ^ (1 << cuid)) << 26;
 344
 345         pci_write_config_dword(nb->link, 0x1d4, mask);
 346
 347         /* reset BAN mode if L3 partitioning returned to reset state */
 348         pci_read_config_dword(nb->link, 0x1d4, &reg);
 349         if (reg == reset) {
 350                 pci_read_config_dword(nb->misc, 0x1b8, &reg);
 351                 reg &= ~0x180000;
 352                 pci_write_config_dword(nb->misc, 0x1b8, reg | ban);
 353         }
 354
 355         return 0;
 356 }
 357
 358 static void amd_cache_gart(void)
 359 {
 360         u16 i;
 361
 362         if (!amd_nb_has_feature(AMD_NB_GART))
 363                 return;
 364
 365         flush_words = kmalloc_array(amd_northbridges.num, sizeof(u32), GFP_KERNEL);
 366         if (!flush_words) {
 367                 amd_northbridges.flags &= ~AMD_NB_GART;
 368                 pr_notice("Cannot initialize GART flush words, GART support disabled\n");
 369                 return;
 370         }
 371
 372         for (i = 0; i != amd_northbridges.num; i++)
 373                 pci_read_config_dword(node_to_amd_nb(i)->misc, 0x9c, &flush_words[i]);
 374 }
 375
 376 void amd_flush_garts(void)
 377 {
 378         int flushed, i;
 379         unsigned long flags;
 380         static DEFINE_SPINLOCK(gart_lock);
 381
 382         if (!amd_nb_has_feature(AMD_NB_GART))
 383                 return;
 384
 385         /*
 386          * Avoid races between AGP and IOMMU. In theory it's not needed
 387          * but I'm not sure if the hardware won't lose flush requests
 388          * when another is pending. This whole thing is so expensive anyways
 389          * that it doesn't matter to serialize more. -AK
 390          */
 391         spin_lock_irqsave(&gart_lock, flags);
 392         flushed = 0;
 393         for (i = 0; i < amd_northbridges.num; i++) {
 394                 pci_write_config_dword(node_to_amd_nb(i)->misc, 0x9c,
 395                                        flush_words[i] | 1);
 396                 flushed++;
 397         }
 398         for (i = 0; i < amd_northbridges.num; i++) {
 399                 u32 w;
 400                 /* Make sure the hardware actually executed the flush*/
 401                 for (;;) {
 402                         pci_read_config_dword(node_to_amd_nb(i)->misc,
 403                                               0x9c, &w);
 404                         if (!(w & 1))
 405                                 break;
 406                         cpu_relax();
 407                 }
 408         }
 409         spin_unlock_irqrestore(&gart_lock, flags);
 410         if (!flushed)
 411                 pr_notice("nothing to flush?\n");
 412 }
 413 EXPORT_SYMBOL_GPL(amd_flush_garts);
 414
 415 static void __fix_erratum_688(void *info)
 416 {
 417 #define MSR_AMD64_IC_CFG 0xC0011021
 418
 419         msr_set_bit(MSR_AMD64_IC_CFG, 3);
 420         msr_set_bit(MSR_AMD64_IC_CFG, 14);
 421 }
 422
 423 /* Apply erratum 688 fix so machines without a BIOS fix work. */
 424 static __init void fix_erratum_688(void)
 425 {
 426         struct pci_dev *F4;
 427         u32 val;
 428
 429         if (boot_cpu_data.x86 != 0x14)
 430                 return;
 431
 432         if (!amd_northbridges.num)
 433                 return;
 434
 435         F4 = node_to_amd_nb(0)->link;
 436         if (!F4)
 437                 return;
 438
 439         if (pci_read_config_dword(F4, 0x164, &val))
 440                 return;
 441
 442         if (val & BIT(2))
 443                 return;
 444
 445         on_each_cpu(__fix_erratum_688, NULL, 0);
 446
 447         pr_info("x86/cpu/AMD: CPU erratum 688 worked around\n");
 448 }
 449
 450 static __init int init_amd_nbs(void)
 451 {
 452         amd_cache_northbridges();
 453         amd_cache_gart();
 454
 455         fix_erratum_688();
 456
 457         return 0;
 458 }
 459
 460 /* This has to go after the PCI subsystem */
 461 fs_initcall(init_amd_nbs);