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