arch/x86/pci/amd_bus.c

   1 #include <linux/init.h>
   2 #include <linux/pci.h>
   3 #include <linux/topology.h>
   4 #include <linux/cpu.h>
   5 #include <linux/range.h>
   6
   7 #include <asm/amd_nb.h>
   8 #include <asm/pci_x86.h>
   9
  10 #include <asm/pci-direct.h>
  11
  12 #include "bus_numa.h"
  13
  14 /*
  15  * This discovers the pcibus <-> node mapping on AMD K8.
  16  * also get peer root bus resource for io,mmio
  17  */
  18
  19 struct pci_hostbridge_probe {
  20         u32 bus;
  21         u32 slot;
  22         u32 vendor;
  23         u32 device;
  24 };
  25
  26 static struct pci_hostbridge_probe pci_probes[] __initdata = {
  27         { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1100 },
  28         { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1200 },
  29         { 0xff, 0, PCI_VENDOR_ID_AMD, 0x1200 },
  30         { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1300 },
  31 };
  32
  33 #define RANGE_NUM 16
  34
  35 /**
  36  * early_fill_mp_bus_to_node()
  37  * called before pcibios_scan_root and pci_scan_bus
  38  * fills the mp_bus_to_cpumask array based according to the LDT Bus Number
  39  * Registers found in the K8 northbridge
  40  */
  41 static int __init early_fill_mp_bus_info(void)
  42 {
  43         int i;
  44         int j;
  45         unsigned bus;
  46         unsigned slot;
  47         int node;
  48         int link;
  49         int def_node;
  50         int def_link;
  51         struct pci_root_info *info;
  52         u32 reg;
  53         struct resource *res;
  54         u64 start;
  55         u64 end;
  56         struct range range[RANGE_NUM];
  57         u64 val;
  58         u32 address;
  59         bool found;
  60         struct resource fam10h_mmconf_res, *fam10h_mmconf;
  61         u64 fam10h_mmconf_start;
  62         u64 fam10h_mmconf_end;
  63
  64         if (!early_pci_allowed())
  65                 return -1;
  66
  67         found = false;
  68         for (i = 0; i < ARRAY_SIZE(pci_probes); i++) {
  69                 u32 id;
  70                 u16 device;
  71                 u16 vendor;
  72
  73                 bus = pci_probes[i].bus;
  74                 slot = pci_probes[i].slot;
  75                 id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID);
  76
  77                 vendor = id & 0xffff;
  78                 device = (id>>16) & 0xffff;
  79                 if (pci_probes[i].vendor == vendor &&
  80                     pci_probes[i].device == device) {
  81                         found = true;
  82                         break;
  83                 }
  84         }
  85
  86         if (!found)
  87                 return 0;
  88
  89         pci_root_num = 0;
  90         for (i = 0; i < 4; i++) {
  91                 int min_bus;
  92                 int max_bus;
  93                 reg = read_pci_config(bus, slot, 1, 0xe0 + (i << 2));
  94
  95                 /* Check if that register is enabled for bus range */
  96                 if ((reg & 7) != 3)
  97                         continue;
  98
  99                 min_bus = (reg >> 16) & 0xff;
 100                 max_bus = (reg >> 24) & 0xff;
 101                 node = (reg >> 4) & 0x07;
 102 #ifdef CONFIG_NUMA
 103                 for (j = min_bus; j <= max_bus; j++)
 104                         set_mp_bus_to_node(j, node);
 105 #endif
 106                 link = (reg >> 8) & 0x03;
 107
 108                 info = &pci_root_info[pci_root_num];
 109                 info->bus_min = min_bus;
 110                 info->bus_max = max_bus;
 111                 info->node = node;
 112                 info->link = link;
 113                 sprintf(info->name, "PCI Bus #%02x", min_bus);
 114                 pci_root_num++;
 115         }
 116
 117         /* get the default node and link for left over res */
 118         reg = read_pci_config(bus, slot, 0, 0x60);
 119         def_node = (reg >> 8) & 0x07;
 120         reg = read_pci_config(bus, slot, 0, 0x64);
 121         def_link = (reg >> 8) & 0x03;
 122
 123         memset(range, 0, sizeof(range));
 124         add_range(range, RANGE_NUM, 0, 0, 0xffff + 1);
 125         /* io port resource */
 126         for (i = 0; i < 4; i++) {
 127                 reg = read_pci_config(bus, slot, 1, 0xc0 + (i << 3));
 128                 if (!(reg & 3))
 129                         continue;
 130
 131                 start = reg & 0xfff000;
 132                 reg = read_pci_config(bus, slot, 1, 0xc4 + (i << 3));
 133                 node = reg & 0x07;
 134                 link = (reg >> 4) & 0x03;
 135                 end = (reg & 0xfff000) | 0xfff;
 136
 137                 /* find the position */
 138                 for (j = 0; j < pci_root_num; j++) {
 139                         info = &pci_root_info[j];
 140                         if (info->node == node && info->link == link)
 141                                 break;
 142                 }
 143                 if (j == pci_root_num)
 144                         continue; /* not found */
 145
 146                 info = &pci_root_info[j];
 147                 printk(KERN_DEBUG "node %d link %d: io port [%llx, %llx]\n",
 148                        node, link, start, end);
 149
 150                 /* kernel only handle 16 bit only */
 151                 if (end > 0xffff)
 152                         end = 0xffff;
 153                 update_res(info, start, end, IORESOURCE_IO, 1);
 154                 subtract_range(range, RANGE_NUM, start, end + 1);
 155         }
 156         /* add left over io port range to def node/link, [0, 0xffff] */
 157         /* find the position */
 158         for (j = 0; j < pci_root_num; j++) {
 159                 info = &pci_root_info[j];
 160                 if (info->node == def_node && info->link == def_link)
 161                         break;
 162         }
 163         if (j < pci_root_num) {
 164                 info = &pci_root_info[j];
 165                 for (i = 0; i < RANGE_NUM; i++) {
 166                         if (!range[i].end)
 167                                 continue;
 168
 169                         update_res(info, range[i].start, range[i].end - 1,
 170                                    IORESOURCE_IO, 1);
 171                 }
 172         }
 173
 174         memset(range, 0, sizeof(range));
 175         /* 0xfd00000000-0xffffffffff for HT */
 176         end = cap_resource((0xfdULL<<32) - 1);
 177         end++;
 178         add_range(range, RANGE_NUM, 0, 0, end);
 179
 180         /* need to take out [0, TOM) for RAM*/
 181         address = MSR_K8_TOP_MEM1;
 182         rdmsrl(address, val);
 183         end = (val & 0xffffff800000ULL);
 184         printk(KERN_INFO "TOM: %016llx aka %lldM\n", end, end>>20);
 185         if (end < (1ULL<<32))
 186                 subtract_range(range, RANGE_NUM, 0, end);
 187
 188         /* get mmconfig */
 189         fam10h_mmconf = amd_get_mmconfig_range(&fam10h_mmconf_res);
 190         /* need to take out mmconf range */
 191         if (fam10h_mmconf) {
 192                 printk(KERN_DEBUG "Fam 10h mmconf %pR\n", fam10h_mmconf);
 193                 fam10h_mmconf_start = fam10h_mmconf->start;
 194                 fam10h_mmconf_end = fam10h_mmconf->end;
 195                 subtract_range(range, RANGE_NUM, fam10h_mmconf_start,
 196                                  fam10h_mmconf_end + 1);
 197         } else {
 198                 fam10h_mmconf_start = 0;
 199                 fam10h_mmconf_end = 0;
 200         }
 201
 202         /* mmio resource */
 203         for (i = 0; i < 8; i++) {
 204                 reg = read_pci_config(bus, slot, 1, 0x80 + (i << 3));
 205                 if (!(reg & 3))
 206                         continue;
 207
 208                 start = reg & 0xffffff00; /* 39:16 on 31:8*/
 209                 start <<= 8;
 210                 reg = read_pci_config(bus, slot, 1, 0x84 + (i << 3));
 211                 node = reg & 0x07;
 212                 link = (reg >> 4) & 0x03;
 213                 end = (reg & 0xffffff00);
 214                 end <<= 8;
 215                 end |= 0xffff;
 216
 217                 /* find the position */
 218                 for (j = 0; j < pci_root_num; j++) {
 219                         info = &pci_root_info[j];
 220                         if (info->node == node && info->link == link)
 221                                 break;
 222                 }
 223                 if (j == pci_root_num)
 224                         continue; /* not found */
 225
 226                 info = &pci_root_info[j];
 227
 228                 printk(KERN_DEBUG "node %d link %d: mmio [%llx, %llx]",
 229                        node, link, start, end);
 230                 /*
 231                  * some sick allocation would have range overlap with fam10h
 232                  * mmconf range, so need to update start and end.
 233                  */
 234                 if (fam10h_mmconf_end) {
 235                         int changed = 0;
 236                         u64 endx = 0;
 237                         if (start >= fam10h_mmconf_start &&
 238                             start <= fam10h_mmconf_end) {
 239                                 start = fam10h_mmconf_end + 1;
 240                                 changed = 1;
 241                         }
 242
 243                         if (end >= fam10h_mmconf_start &&
 244                             end <= fam10h_mmconf_end) {
 245                                 end = fam10h_mmconf_start - 1;
 246                                 changed = 1;
 247                         }
 248
 249                         if (start < fam10h_mmconf_start &&
 250                             end > fam10h_mmconf_end) {
 251                                 /* we got a hole */
 252                                 endx = fam10h_mmconf_start - 1;
 253                                 update_res(info, start, endx, IORESOURCE_MEM, 0);
 254                                 subtract_range(range, RANGE_NUM, start,
 255                                                  endx + 1);
 256                                 printk(KERN_CONT " ==> [%llx, %llx]", start, endx);
 257                                 start = fam10h_mmconf_end + 1;
 258                                 changed = 1;
 259                         }
 260                         if (changed) {
 261                                 if (start <= end) {
 262                                         printk(KERN_CONT " %s [%llx, %llx]", endx ? "and" : "==>", start, end);
 263                                 } else {
 264                                         printk(KERN_CONT "%s\n", endx?"":" ==> none");
 265                                         continue;
 266                                 }
 267                         }
 268                 }
 269
 270                 update_res(info, cap_resource(start), cap_resource(end),
 271                                  IORESOURCE_MEM, 1);
 272                 subtract_range(range, RANGE_NUM, start, end + 1);
 273                 printk(KERN_CONT "\n");
 274         }
 275
 276         /* need to take out [4G, TOM2) for RAM*/
 277         /* SYS_CFG */
 278         address = MSR_K8_SYSCFG;
 279         rdmsrl(address, val);
 280         /* TOP_MEM2 is enabled? */
 281         if (val & (1<<21)) {
 282                 /* TOP_MEM2 */
 283                 address = MSR_K8_TOP_MEM2;
 284                 rdmsrl(address, val);
 285                 end = (val & 0xffffff800000ULL);
 286                 printk(KERN_INFO "TOM2: %016llx aka %lldM\n", end, end>>20);
 287                 subtract_range(range, RANGE_NUM, 1ULL<<32, end);
 288         }
 289
 290         /*
 291          * add left over mmio range to def node/link ?
 292          * that is tricky, just record range in from start_min to 4G
 293          */
 294         for (j = 0; j < pci_root_num; j++) {
 295                 info = &pci_root_info[j];
 296                 if (info->node == def_node && info->link == def_link)
 297                         break;
 298         }
 299         if (j < pci_root_num) {
 300                 info = &pci_root_info[j];
 301
 302                 for (i = 0; i < RANGE_NUM; i++) {
 303                         if (!range[i].end)
 304                                 continue;
 305
 306                         update_res(info, cap_resource(range[i].start),
 307                                    cap_resource(range[i].end - 1),
 308                                    IORESOURCE_MEM, 1);
 309                 }
 310         }
 311
 312         for (i = 0; i < pci_root_num; i++) {
 313                 int res_num;
 314                 int busnum;
 315
 316                 info = &pci_root_info[i];
 317                 res_num = info->res_num;
 318                 busnum = info->bus_min;
 319                 printk(KERN_DEBUG "bus: [%02x, %02x] on node %x link %x\n",
 320                        info->bus_min, info->bus_max, info->node, info->link);
 321                 for (j = 0; j < res_num; j++) {
 322                         res = &info->res[j];
 323                         printk(KERN_DEBUG "bus: %02x index %x %pR\n",
 324                                        busnum, j, res);
 325                 }
 326         }
 327
 328         return 0;
 329 }
 330
 331 #define ENABLE_CF8_EXT_CFG      (1ULL << 46)
 332
 333 static void __cpuinit enable_pci_io_ecs(void *unused)
 334 {
 335         u64 reg;
 336         rdmsrl(MSR_AMD64_NB_CFG, reg);
 337         if (!(reg & ENABLE_CF8_EXT_CFG)) {
 338                 reg |= ENABLE_CF8_EXT_CFG;
 339                 wrmsrl(MSR_AMD64_NB_CFG, reg);
 340         }
 341 }
 342
 343 static int __cpuinit amd_cpu_notify(struct notifier_block *self,
 344                                     unsigned long action, void *hcpu)
 345 {
 346         int cpu = (long)hcpu;
 347         switch (action) {
 348         case CPU_ONLINE:
 349         case CPU_ONLINE_FROZEN:
 350                 smp_call_function_single(cpu, enable_pci_io_ecs, NULL, 0);
 351                 break;
 352         default:
 353                 break;
 354         }
 355         return NOTIFY_OK;
 356 }
 357
 358 static struct notifier_block __cpuinitdata amd_cpu_notifier = {
 359         .notifier_call  = amd_cpu_notify,
 360 };
 361
 362 static void __init pci_enable_pci_io_ecs(void)
 363 {
 364 #ifdef CONFIG_AMD_NB
 365         unsigned int i, n;
 366
 367         for (n = i = 0; !n && amd_nb_bus_dev_ranges[i].dev_limit; ++i) {
 368                 u8 bus = amd_nb_bus_dev_ranges[i].bus;
 369                 u8 slot = amd_nb_bus_dev_ranges[i].dev_base;
 370                 u8 limit = amd_nb_bus_dev_ranges[i].dev_limit;
 371
 372                 for (; slot < limit; ++slot) {
 373                         u32 val = read_pci_config(bus, slot, 3, 0);
 374
 375                         if (!early_is_amd_nb(val))
 376                                 continue;
 377
 378                         val = read_pci_config(bus, slot, 3, 0x8c);
 379                         if (!(val & (ENABLE_CF8_EXT_CFG >> 32))) {
 380                                 val |= ENABLE_CF8_EXT_CFG >> 32;
 381                                 write_pci_config(bus, slot, 3, 0x8c, val);
 382                         }
 383                         ++n;
 384                 }
 385         }
 386         pr_info("Extended Config Space enabled on %u nodes\n", n);
 387 #endif
 388 }
 389
 390 static int __init pci_io_ecs_init(void)
 391 {
 392         int cpu;
 393
 394         /* assume all cpus from fam10h have IO ECS */
 395         if (boot_cpu_data.x86 < 0x10)
 396                 return 0;
 397
 398         /* Try the PCI method first. */
 399         if (early_pci_allowed())
 400                 pci_enable_pci_io_ecs();
 401
 402         register_cpu_notifier(&amd_cpu_notifier);
 403         for_each_online_cpu(cpu)
 404                 amd_cpu_notify(&amd_cpu_notifier, (unsigned long)CPU_ONLINE,
 405                                (void *)(long)cpu);
 406         pci_probe |= PCI_HAS_IO_ECS;
 407
 408         return 0;
 409 }
 410
 411 static int __init amd_postcore_init(void)
 412 {
 413         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 414                 return 0;
 415
 416         early_fill_mp_bus_info();
 417         pci_io_ecs_init();
 418
 419         return 0;
 420 }
 421
 422 postcore_initcall(amd_postcore_init);