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/pci_x86.h>
   8
   9 #include <asm/pci-direct.h>
  10
  11 #include "bus_numa.h"
  12
  13 /*
  14  * This discovers the pcibus <-> node mapping on AMD K8.
  15  * also get peer root bus resource for io,mmio
  16  */
  17
  18 struct pci_hostbridge_probe {
  19         u32 bus;
  20         u32 slot;
  21         u32 vendor;
  22         u32 device;
  23 };
  24
  25 static struct pci_hostbridge_probe pci_probes[] __initdata = {
  26         { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1100 },
  27         { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1200 },
  28         { 0xff, 0, PCI_VENDOR_ID_AMD, 0x1200 },
  29         { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1300 },
  30 };
  31
  32 static u64 __initdata fam10h_mmconf_start;
  33 static u64 __initdata fam10h_mmconf_end;
  34 static void __init get_pci_mmcfg_amd_fam10h_range(void)
  35 {
  36         u32 address;
  37         u64 base, msr;
  38         unsigned segn_busn_bits;
  39
  40         /* assume all cpus from fam10h have mmconf */
  41         if (boot_cpu_data.x86 < 0x10)
  42                 return;
  43
  44         address = MSR_FAM10H_MMIO_CONF_BASE;
  45         rdmsrl(address, msr);
  46
  47         /* mmconfig is not enable */
  48         if (!(msr & FAM10H_MMIO_CONF_ENABLE))
  49                 return;
  50
  51         base = msr & (FAM10H_MMIO_CONF_BASE_MASK<<FAM10H_MMIO_CONF_BASE_SHIFT);
  52
  53         segn_busn_bits = (msr >> FAM10H_MMIO_CONF_BUSRANGE_SHIFT) &
  54                          FAM10H_MMIO_CONF_BUSRANGE_MASK;
  55
  56         fam10h_mmconf_start = base;
  57         fam10h_mmconf_end = base + (1ULL<<(segn_busn_bits + 20)) - 1;
  58 }
  59
  60 #define RANGE_NUM 16
  61
  62 /**
  63  * early_fill_mp_bus_to_node()
  64  * called before pcibios_scan_root and pci_scan_bus
  65  * fills the mp_bus_to_cpumask array based according to the LDT Bus Number
  66  * Registers found in the K8 northbridge
  67  */
  68 static int __init early_fill_mp_bus_info(void)
  69 {
  70         int i;
  71         int j;
  72         unsigned bus;
  73         unsigned slot;
  74         int node;
  75         int link;
  76         int def_node;
  77         int def_link;
  78         struct pci_root_info *info;
  79         u32 reg;
  80         struct resource *res;
  81         u64 start;
  82         u64 end;
  83         struct range range[RANGE_NUM];
  84         u64 val;
  85         u32 address;
  86         bool found;
  87
  88         if (!early_pci_allowed())
  89                 return -1;
  90
  91         found = false;
  92         for (i = 0; i < ARRAY_SIZE(pci_probes); i++) {
  93                 u32 id;
  94                 u16 device;
  95                 u16 vendor;
  96
  97                 bus = pci_probes[i].bus;
  98                 slot = pci_probes[i].slot;
  99                 id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID);
 100
 101                 vendor = id & 0xffff;
 102                 device = (id>>16) & 0xffff;
 103                 if (pci_probes[i].vendor == vendor &&
 104                     pci_probes[i].device == device) {
 105                         found = true;
 106                         break;
 107                 }
 108         }
 109
 110         if (!found)
 111                 return 0;
 112
 113         pci_root_num = 0;
 114         for (i = 0; i < 4; i++) {
 115                 int min_bus;
 116                 int max_bus;
 117                 reg = read_pci_config(bus, slot, 1, 0xe0 + (i << 2));
 118
 119                 /* Check if that register is enabled for bus range */
 120                 if ((reg & 7) != 3)
 121                         continue;
 122
 123                 min_bus = (reg >> 16) & 0xff;
 124                 max_bus = (reg >> 24) & 0xff;
 125                 node = (reg >> 4) & 0x07;
 126 #ifdef CONFIG_NUMA
 127                 for (j = min_bus; j <= max_bus; j++)
 128                         set_mp_bus_to_node(j, node);
 129 #endif
 130                 link = (reg >> 8) & 0x03;
 131
 132                 info = &pci_root_info[pci_root_num];
 133                 info->bus_min = min_bus;
 134                 info->bus_max = max_bus;
 135                 info->node = node;
 136                 info->link = link;
 137                 sprintf(info->name, "PCI Bus #%02x", min_bus);
 138                 pci_root_num++;
 139         }
 140
 141         /* get the default node and link for left over res */
 142         reg = read_pci_config(bus, slot, 0, 0x60);
 143         def_node = (reg >> 8) & 0x07;
 144         reg = read_pci_config(bus, slot, 0, 0x64);
 145         def_link = (reg >> 8) & 0x03;
 146
 147         memset(range, 0, sizeof(range));
 148         add_range(range, RANGE_NUM, 0, 0, 0xffff + 1);
 149         /* io port resource */
 150         for (i = 0; i < 4; i++) {
 151                 reg = read_pci_config(bus, slot, 1, 0xc0 + (i << 3));
 152                 if (!(reg & 3))
 153                         continue;
 154
 155                 start = reg & 0xfff000;
 156                 reg = read_pci_config(bus, slot, 1, 0xc4 + (i << 3));
 157                 node = reg & 0x07;
 158                 link = (reg >> 4) & 0x03;
 159                 end = (reg & 0xfff000) | 0xfff;
 160
 161                 /* find the position */
 162                 for (j = 0; j < pci_root_num; j++) {
 163                         info = &pci_root_info[j];
 164                         if (info->node == node && info->link == link)
 165                                 break;
 166                 }
 167                 if (j == pci_root_num)
 168                         continue; /* not found */
 169
 170                 info = &pci_root_info[j];
 171                 printk(KERN_DEBUG "node %d link %d: io port [%llx, %llx]\n",
 172                        node, link, start, end);
 173
 174                 /* kernel only handle 16 bit only */
 175                 if (end > 0xffff)
 176                         end = 0xffff;
 177                 update_res(info, start, end, IORESOURCE_IO, 1);
 178                 subtract_range(range, RANGE_NUM, start, end + 1);
 179         }
 180         /* add left over io port range to def node/link, [0, 0xffff] */
 181         /* find the position */
 182         for (j = 0; j < pci_root_num; j++) {
 183                 info = &pci_root_info[j];
 184                 if (info->node == def_node && info->link == def_link)
 185                         break;
 186         }
 187         if (j < pci_root_num) {
 188                 info = &pci_root_info[j];
 189                 for (i = 0; i < RANGE_NUM; i++) {
 190                         if (!range[i].end)
 191                                 continue;
 192
 193                         update_res(info, range[i].start, range[i].end - 1,
 194                                    IORESOURCE_IO, 1);
 195                 }
 196         }
 197
 198         memset(range, 0, sizeof(range));
 199         /* 0xfd00000000-0xffffffffff for HT */
 200         end = cap_resource((0xfdULL<<32) - 1);
 201         end++;
 202         add_range(range, RANGE_NUM, 0, 0, end);
 203
 204         /* need to take out [0, TOM) for RAM*/
 205         address = MSR_K8_TOP_MEM1;
 206         rdmsrl(address, val);
 207         end = (val & 0xffffff800000ULL);
 208         printk(KERN_INFO "TOM: %016llx aka %lldM\n", end, end>>20);
 209         if (end < (1ULL<<32))
 210                 subtract_range(range, RANGE_NUM, 0, end);
 211
 212         /* get mmconfig */
 213         get_pci_mmcfg_amd_fam10h_range();
 214         /* need to take out mmconf range */
 215         if (fam10h_mmconf_end) {
 216                 printk(KERN_DEBUG "Fam 10h mmconf [%llx, %llx]\n", fam10h_mmconf_start, fam10h_mmconf_end);
 217                 subtract_range(range, RANGE_NUM, fam10h_mmconf_start,
 218                                  fam10h_mmconf_end + 1);
 219         }
 220
 221         /* mmio resource */
 222         for (i = 0; i < 8; i++) {
 223                 reg = read_pci_config(bus, slot, 1, 0x80 + (i << 3));
 224                 if (!(reg & 3))
 225                         continue;
 226
 227                 start = reg & 0xffffff00; /* 39:16 on 31:8*/
 228                 start <<= 8;
 229                 reg = read_pci_config(bus, slot, 1, 0x84 + (i << 3));
 230                 node = reg & 0x07;
 231                 link = (reg >> 4) & 0x03;
 232                 end = (reg & 0xffffff00);
 233                 end <<= 8;
 234                 end |= 0xffff;
 235
 236                 /* find the position */
 237                 for (j = 0; j < pci_root_num; j++) {
 238                         info = &pci_root_info[j];
 239                         if (info->node == node && info->link == link)
 240                                 break;
 241                 }
 242                 if (j == pci_root_num)
 243                         continue; /* not found */
 244
 245                 info = &pci_root_info[j];
 246
 247                 printk(KERN_DEBUG "node %d link %d: mmio [%llx, %llx]",
 248                        node, link, start, end);
 249                 /*
 250                  * some sick allocation would have range overlap with fam10h
 251                  * mmconf range, so need to update start and end.
 252                  */
 253                 if (fam10h_mmconf_end) {
 254                         int changed = 0;
 255                         u64 endx = 0;
 256                         if (start >= fam10h_mmconf_start &&
 257                             start <= fam10h_mmconf_end) {
 258                                 start = fam10h_mmconf_end + 1;
 259                                 changed = 1;
 260                         }
 261
 262                         if (end >= fam10h_mmconf_start &&
 263                             end <= fam10h_mmconf_end) {
 264                                 end = fam10h_mmconf_start - 1;
 265                                 changed = 1;
 266                         }
 267
 268                         if (start < fam10h_mmconf_start &&
 269                             end > fam10h_mmconf_end) {
 270                                 /* we got a hole */
 271                                 endx = fam10h_mmconf_start - 1;
 272                                 update_res(info, start, endx, IORESOURCE_MEM, 0);
 273                                 subtract_range(range, RANGE_NUM, start,
 274                                                  endx + 1);
 275                                 printk(KERN_CONT " ==> [%llx, %llx]", start, endx);
 276                                 start = fam10h_mmconf_end + 1;
 277                                 changed = 1;
 278                         }
 279                         if (changed) {
 280                                 if (start <= end) {
 281                                         printk(KERN_CONT " %s [%llx, %llx]", endx ? "and" : "==>", start, end);
 282                                 } else {
 283                                         printk(KERN_CONT "%s\n", endx?"":" ==> none");
 284                                         continue;
 285                                 }
 286                         }
 287                 }
 288
 289                 update_res(info, cap_resource(start), cap_resource(end),
 290                                  IORESOURCE_MEM, 1);
 291                 subtract_range(range, RANGE_NUM, start, end + 1);
 292                 printk(KERN_CONT "\n");
 293         }
 294
 295         /* need to take out [4G, TOM2) for RAM*/
 296         /* SYS_CFG */
 297         address = MSR_K8_SYSCFG;
 298         rdmsrl(address, val);
 299         /* TOP_MEM2 is enabled? */
 300         if (val & (1<<21)) {
 301                 /* TOP_MEM2 */
 302                 address = MSR_K8_TOP_MEM2;
 303                 rdmsrl(address, val);
 304                 end = (val & 0xffffff800000ULL);
 305                 printk(KERN_INFO "TOM2: %016llx aka %lldM\n", end, end>>20);
 306                 subtract_range(range, RANGE_NUM, 1ULL<<32, end);
 307         }
 308
 309         /*
 310          * add left over mmio range to def node/link ?
 311          * that is tricky, just record range in from start_min to 4G
 312          */
 313         for (j = 0; j < pci_root_num; j++) {
 314                 info = &pci_root_info[j];
 315                 if (info->node == def_node && info->link == def_link)
 316                         break;
 317         }
 318         if (j < pci_root_num) {
 319                 info = &pci_root_info[j];
 320
 321                 for (i = 0; i < RANGE_NUM; i++) {
 322                         if (!range[i].end)
 323                                 continue;
 324
 325                         update_res(info, cap_resource(range[i].start),
 326                                    cap_resource(range[i].end - 1),
 327                                    IORESOURCE_MEM, 1);
 328                 }
 329         }
 330
 331         for (i = 0; i < pci_root_num; i++) {
 332                 int res_num;
 333                 int busnum;
 334
 335                 info = &pci_root_info[i];
 336                 res_num = info->res_num;
 337                 busnum = info->bus_min;
 338                 printk(KERN_DEBUG "bus: [%02x, %02x] on node %x link %x\n",
 339                        info->bus_min, info->bus_max, info->node, info->link);
 340                 for (j = 0; j < res_num; j++) {
 341                         res = &info->res[j];
 342                         printk(KERN_DEBUG "bus: %02x index %x %pR\n",
 343                                        busnum, j, res);
 344                 }
 345         }
 346
 347         return 0;
 348 }
 349
 350 #define ENABLE_CF8_EXT_CFG      (1ULL << 46)
 351
 352 static void enable_pci_io_ecs(void *unused)
 353 {
 354         u64 reg;
 355         rdmsrl(MSR_AMD64_NB_CFG, reg);
 356         if (!(reg & ENABLE_CF8_EXT_CFG)) {
 357                 reg |= ENABLE_CF8_EXT_CFG;
 358                 wrmsrl(MSR_AMD64_NB_CFG, reg);
 359         }
 360 }
 361
 362 static int __cpuinit amd_cpu_notify(struct notifier_block *self,
 363                                     unsigned long action, void *hcpu)
 364 {
 365         int cpu = (long)hcpu;
 366         switch (action) {
 367         case CPU_ONLINE:
 368         case CPU_ONLINE_FROZEN:
 369                 smp_call_function_single(cpu, enable_pci_io_ecs, NULL, 0);
 370                 break;
 371         default:
 372                 break;
 373         }
 374         return NOTIFY_OK;
 375 }
 376
 377 static struct notifier_block __cpuinitdata amd_cpu_notifier = {
 378         .notifier_call  = amd_cpu_notify,
 379 };
 380
 381 static int __init pci_io_ecs_init(void)
 382 {
 383         int cpu;
 384
 385         /* assume all cpus from fam10h have IO ECS */
 386         if (boot_cpu_data.x86 < 0x10)
 387                 return 0;
 388
 389         register_cpu_notifier(&amd_cpu_notifier);
 390         for_each_online_cpu(cpu)
 391                 amd_cpu_notify(&amd_cpu_notifier, (unsigned long)CPU_ONLINE,
 392                                (void *)(long)cpu);
 393         pci_probe |= PCI_HAS_IO_ECS;
 394
 395         return 0;
 396 }
 397
 398 static int __init amd_postcore_init(void)
 399 {
 400         if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
 401                 return 0;
 402
 403         early_fill_mp_bus_info();
 404         pci_io_ecs_init();
 405
 406         return 0;
 407 }
 408
 409 postcore_initcall(amd_postcore_init);