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_DF_F3     0x1463
  18 #define PCI_DEVICE_ID_AMD_17H_DF_F4     0x1464
  19
  20 /* Protect the PCI config register pairs used for SMN and DF indirect access. */
  21 static DEFINE_MUTEX(smn_mutex);
  22
  23 static u32 *flush_words;
  24
  25 static const struct pci_device_id amd_root_ids[] = {
  26         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_ROOT) },
  27         {}
  28 };
  29
  30 #define PCI_DEVICE_ID_AMD_CNB17H_F4     0x1704
  31
  32 const struct pci_device_id amd_nb_misc_ids[] = {
  33         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
  34         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
  35         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
  36         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
  37         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) },
  38         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F3) },
  39         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
  40         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F3) },
  41         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_DF_F3) },
  42         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
  43         {}
  44 };
  45 EXPORT_SYMBOL_GPL(amd_nb_misc_ids);
  46
  47 static const struct pci_device_id amd_nb_link_ids[] = {
  48         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
  49         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },
  50         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_M60H_NB_F4) },
  51         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
  52         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F4) },
  53         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_17H_DF_F4) },
  54         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CNB17H_F4) },
  55         {}
  56 };
  57
  58 const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[] __initconst = {
  59         { 0x00, 0x18, 0x20 },
  60         { 0xff, 0x00, 0x20 },
  61         { 0xfe, 0x00, 0x20 },
  62         { }
  63 };
  64
  65 static struct amd_northbridge_info amd_northbridges;
  66
  67 u16 amd_nb_num(void)
  68 {
  69         return amd_northbridges.num;
  70 }
  71 EXPORT_SYMBOL_GPL(amd_nb_num);
  72
  73 bool amd_nb_has_feature(unsigned int feature)
  74 {
  75         return ((amd_northbridges.flags & feature) == feature);
  76 }
  77 EXPORT_SYMBOL_GPL(amd_nb_has_feature);
  78
  79 struct amd_northbridge *node_to_amd_nb(int node)
  80 {
  81         return (node < amd_northbridges.num) ? &amd_northbridges.nb[node] : NULL;
  82 }
  83 EXPORT_SYMBOL_GPL(node_to_amd_nb);
  84
  85 static struct pci_dev *next_northbridge(struct pci_dev *dev,
  86                                         const struct pci_device_id *ids)
  87 {
  88         do {
  89                 dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
  90                 if (!dev)
  91                         break;
  92         } while (!pci_match_id(ids, dev));
  93         return dev;
  94 }
  95
  96 static int __amd_smn_rw(u16 node, u32 address, u32 *value, bool write)
  97 {
  98         struct pci_dev *root;
  99         int err = -ENODEV;
 100
 101         if (node >= amd_northbridges.num)
 102                 goto out;
 103
 104         root = node_to_amd_nb(node)->root;
 105         if (!root)
 106                 goto out;
 107
 108         mutex_lock(&smn_mutex);
 109
 110         err = pci_write_config_dword(root, 0x60, address);
 111         if (err) {
 112                 pr_warn("Error programming SMN address 0x%x.\n", address);
 113                 goto out_unlock;
 114         }
 115
 116         err = (write ? pci_write_config_dword(root, 0x64, *value)
 117                      : pci_read_config_dword(root, 0x64, value));
 118         if (err)
 119                 pr_warn("Error %s SMN address 0x%x.\n",
 120                         (write ? "writing to" : "reading from"), address);
 121
 122 out_unlock:
 123         mutex_unlock(&smn_mutex);
 124
 125 out:
 126         return err;
 127 }
 128
 129 int amd_smn_read(u16 node, u32 address, u32 *value)
 130 {
 131         return __amd_smn_rw(node, address, value, false);
 132 }
 133 EXPORT_SYMBOL_GPL(amd_smn_read);
 134
 135 int amd_smn_write(u16 node, u32 address, u32 value)
 136 {
 137         return __amd_smn_rw(node, address, &value, true);
 138 }
 139 EXPORT_SYMBOL_GPL(amd_smn_write);
 140
 141 /*
 142  * Data Fabric Indirect Access uses FICAA/FICAD.
 143  *
 144  * Fabric Indirect Configuration Access Address (FICAA): Constructed based
 145  * on the device's Instance Id and the PCI function and register offset of
 146  * the desired register.
 147  *
 148  * Fabric Indirect Configuration Access Data (FICAD): There are FICAD LO
 149  * and FICAD HI registers but so far we only need the LO register.
 150  */
 151 int amd_df_indirect_read(u16 node, u8 func, u16 reg, u8 instance_id, u32 *lo)
 152 {
 153         struct pci_dev *F4;
 154         u32 ficaa;
 155         int err = -ENODEV;
 156
 157         if (node >= amd_northbridges.num)
 158                 goto out;
 159
 160         F4 = node_to_amd_nb(node)->link;
 161         if (!F4)
 162                 goto out;
 163
 164         ficaa  = 1;
 165         ficaa |= reg & 0x3FC;
 166         ficaa |= (func & 0x7) << 11;
 167         ficaa |= instance_id << 16;
 168
 169         mutex_lock(&smn_mutex);
 170
 171         err = pci_write_config_dword(F4, 0x5C, ficaa);
 172         if (err) {
 173                 pr_warn("Error writing DF Indirect FICAA, FICAA=0x%x\n", ficaa);
 174                 goto out_unlock;
 175         }
 176
 177         err = pci_read_config_dword(F4, 0x98, lo);
 178         if (err)
 179                 pr_warn("Error reading DF Indirect FICAD LO, FICAA=0x%x.\n", ficaa);
 180
 181 out_unlock:
 182         mutex_unlock(&smn_mutex);
 183
 184 out:
 185         return err;
 186 }
 187 EXPORT_SYMBOL_GPL(amd_df_indirect_read);
 188
 189 int amd_cache_northbridges(void)
 190 {
 191         u16 i = 0;
 192         struct amd_northbridge *nb;
 193         struct pci_dev *root, *misc, *link;
 194
 195         if (amd_northbridges.num)
 196                 return 0;
 197
 198         misc = NULL;
 199         while ((misc = next_northbridge(misc, amd_nb_misc_ids)) != NULL)
 200                 i++;
 201
 202         if (!i)
 203                 return -ENODEV;
 204
 205         nb = kcalloc(i, sizeof(struct amd_northbridge), GFP_KERNEL);
 206         if (!nb)
 207                 return -ENOMEM;
 208
 209         amd_northbridges.nb = nb;
 210         amd_northbridges.num = i;
 211
 212         link = misc = root = NULL;
 213         for (i = 0; i != amd_northbridges.num; i++) {
 214                 node_to_amd_nb(i)->root = root =
 215                         next_northbridge(root, amd_root_ids);
 216                 node_to_amd_nb(i)->misc = misc =
 217                         next_northbridge(misc, amd_nb_misc_ids);
 218                 node_to_amd_nb(i)->link = link =
 219                         next_northbridge(link, amd_nb_link_ids);
 220         }
 221
 222         if (amd_gart_present())
 223                 amd_northbridges.flags |= AMD_NB_GART;
 224
 225         /*
 226          * Check for L3 cache presence.
 227          */
 228         if (!cpuid_edx(0x80000006))
 229                 return 0;
 230
 231         /*
 232          * Some CPU families support L3 Cache Index Disable. There are some
 233          * limitations because of E382 and E388 on family 0x10.
 234          */
 235         if (boot_cpu_data.x86 == 0x10 &&
 236             boot_cpu_data.x86_model >= 0x8 &&
 237             (boot_cpu_data.x86_model > 0x9 ||
 238              boot_cpu_data.x86_stepping >= 0x1))
 239                 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
 240
 241         if (boot_cpu_data.x86 == 0x15)
 242                 amd_northbridges.flags |= AMD_NB_L3_INDEX_DISABLE;
 243
 244         /* L3 cache partitioning is supported on family 0x15 */
 245         if (boot_cpu_data.x86 == 0x15)
 246                 amd_northbridges.flags |= AMD_NB_L3_PARTITIONING;
 247
 248         return 0;
 249 }
 250 EXPORT_SYMBOL_GPL(amd_cache_northbridges);
 251
 252 /*
 253  * Ignores subdevice/subvendor but as far as I can figure out
 254  * they're useless anyways
 255  */
 256 bool __init early_is_amd_nb(u32 device)
 257 {
 258         const struct pci_device_id *id;
 259         u32 vendor = device & 0xffff;
 260
 261         device >>= 16;
 262         for (id = amd_nb_misc_ids; id->vendor; id++)
 263                 if (vendor == id->vendor && device == id->device)
 264                         return true;
 265         return false;
 266 }
 267
 268 struct resource *amd_get_mmconfig_range(struct resource *res)
 269 {
 270         u32 address;
 271         u64 base, msr;
 272         unsigned int segn_busn_bits;
 273
 274         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 275                 return NULL;
 276
 277         /* assume all cpus from fam10h have mmconfig */
 278         if (boot_cpu_data.x86 < 0x10)
 279                 return NULL;
 280
 281         address = MSR_FAM10H_MMIO_CONF_BASE;
 282         rdmsrl(address, msr);
 283
 284         /* mmconfig is not enabled */
 285         if (!(msr & FAM10H_MMIO_CONF_ENABLE))
 286                 return NULL;
 287
 288         base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);
 289
 290         segn_busn_bits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
 291                          FAM10H_MMIO_CONF_BUSRANGE_MASK;
 292
 293         res->flags = IORESOURCE_MEM;
 294         res->start = base;
 295         res->end = base + (1ULL<<(segn_busn_bits + 20)) - 1;
 296         return res;
 297 }
 298
 299 int amd_get_subcaches(int cpu)
 300 {
 301         struct pci_dev *link = node_to_amd_nb(amd_get_nb_id(cpu))->link;
 302         unsigned int mask;
 303
 304         if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
 305                 return 0;
 306
 307         pci_read_config_dword(link, 0x1d4, &mask);
 308
 309         return (mask >> (4 * cpu_data(cpu).cpu_core_id)) & 0xf;
 310 }
 311
 312 int amd_set_subcaches(int cpu, unsigned long mask)
 313 {
 314         static unsigned int reset, ban;
 315         struct amd_northbridge *nb = node_to_amd_nb(amd_get_nb_id(cpu));
 316         unsigned int reg;
 317         int cuid;
 318
 319         if (!amd_nb_has_feature(AMD_NB_L3_PARTITIONING) || mask > 0xf)
 320                 return -EINVAL;
 321
 322         /* if necessary, collect reset state of L3 partitioning and BAN mode */
 323         if (reset == 0) {
 324                 pci_read_config_dword(nb->link, 0x1d4, &reset);
 325                 pci_read_config_dword(nb->misc, 0x1b8, &ban);
 326                 ban &= 0x180000;
 327         }
 328
 329         /* deactivate BAN mode if any subcaches are to be disabled */
 330         if (mask != 0xf) {
 331                 pci_read_config_dword(nb->misc, 0x1b8, &reg);
 332                 pci_write_config_dword(nb->misc, 0x1b8, reg & ~0x180000);
 333         }
 334
 335         cuid = cpu_data(cpu).cpu_core_id;
 336         mask <<= 4 * cuid;
 337         mask |= (0xf ^ (1 << cuid)) << 26;
 338
 339         pci_write_config_dword(nb->link, 0x1d4, mask);
 340
 341         /* reset BAN mode if L3 partitioning returned to reset state */
 342         pci_read_config_dword(nb->link, 0x1d4, &reg);
 343         if (reg == reset) {
 344                 pci_read_config_dword(nb->misc, 0x1b8, &reg);
 345                 reg &= ~0x180000;
 346                 pci_write_config_dword(nb->misc, 0x1b8, reg | ban);
 347         }
 348
 349         return 0;
 350 }
 351
 352 static void amd_cache_gart(void)
 353 {
 354         u16 i;
 355
 356         if (!amd_nb_has_feature(AMD_NB_GART))
 357                 return;
 358
 359         flush_words = kmalloc_array(amd_northbridges.num, sizeof(u32), GFP_KERNEL);
 360         if (!flush_words) {
 361                 amd_northbridges.flags &= ~AMD_NB_GART;
 362                 pr_notice("Cannot initialize GART flush words, GART support disabled\n");
 363                 return;
 364         }
 365
 366         for (i = 0; i != amd_northbridges.num; i++)
 367                 pci_read_config_dword(node_to_amd_nb(i)->misc, 0x9c, &flush_words[i]);
 368 }
 369
 370 void amd_flush_garts(void)
 371 {
 372         int flushed, i;
 373         unsigned long flags;
 374         static DEFINE_SPINLOCK(gart_lock);
 375
 376         if (!amd_nb_has_feature(AMD_NB_GART))
 377                 return;
 378
 379         /*
 380          * Avoid races between AGP and IOMMU. In theory it's not needed
 381          * but I'm not sure if the hardware won't lose flush requests
 382          * when another is pending. This whole thing is so expensive anyways
 383          * that it doesn't matter to serialize more. -AK
 384          */
 385         spin_lock_irqsave(&gart_lock, flags);
 386         flushed = 0;
 387         for (i = 0; i < amd_northbridges.num; i++) {
 388                 pci_write_config_dword(node_to_amd_nb(i)->misc, 0x9c,
 389                                        flush_words[i] | 1);
 390                 flushed++;
 391         }
 392         for (i = 0; i < amd_northbridges.num; i++) {
 393                 u32 w;
 394                 /* Make sure the hardware actually executed the flush*/
 395                 for (;;) {
 396                         pci_read_config_dword(node_to_amd_nb(i)->misc,
 397                                               0x9c, &w);
 398                         if (!(w & 1))
 399                                 break;
 400                         cpu_relax();
 401                 }
 402         }
 403         spin_unlock_irqrestore(&gart_lock, flags);
 404         if (!flushed)
 405                 pr_notice("nothing to flush?\n");
 406 }
 407 EXPORT_SYMBOL_GPL(amd_flush_garts);
 408
 409 static void __fix_erratum_688(void *info)
 410 {
 411 #define MSR_AMD64_IC_CFG 0xC0011021
 412
 413         msr_set_bit(MSR_AMD64_IC_CFG, 3);
 414         msr_set_bit(MSR_AMD64_IC_CFG, 14);
 415 }
 416
 417 /* Apply erratum 688 fix so machines without a BIOS fix work. */
 418 static __init void fix_erratum_688(void)
 419 {
 420         struct pci_dev *F4;
 421         u32 val;
 422
 423         if (boot_cpu_data.x86 != 0x14)
 424                 return;
 425
 426         if (!amd_northbridges.num)
 427                 return;
 428
 429         F4 = node_to_amd_nb(0)->link;
 430         if (!F4)
 431                 return;
 432
 433         if (pci_read_config_dword(F4, 0x164, &val))
 434                 return;
 435
 436         if (val & BIT(2))
 437                 return;
 438
 439         on_each_cpu(__fix_erratum_688, NULL, 0);
 440
 441         pr_info("x86/cpu/AMD: CPU erratum 688 worked around\n");
 442 }
 443
 444 static __init int init_amd_nbs(void)
 445 {
 446         amd_cache_northbridges();
 447         amd_cache_gart();
 448
 449         fix_erratum_688();
 450
 451         return 0;
 452 }
 453
 454 /* This has to go after the PCI subsystem */
 455 fs_initcall(init_amd_nbs);