linux/arch/x86/pci/amd_bus.c
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   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/init.h>
   3#include <linux/pci.h>
   4#include <linux/topology.h>
   5#include <linux/cpu.h>
   6#include <linux/range.h>
   7
   8#include <asm/amd_nb.h>
   9#include <asm/pci_x86.h>
  10
  11#include <asm/pci-direct.h>
  12
  13#include "bus_numa.h"
  14
  15#define AMD_NB_F0_NODE_ID                       0x60
  16#define AMD_NB_F0_UNIT_ID                       0x64
  17#define AMD_NB_F1_CONFIG_MAP_REG                0xe0
  18
  19#define RANGE_NUM                               16
  20#define AMD_NB_F1_CONFIG_MAP_RANGES             4
  21
  22struct amd_hostbridge {
  23        u32 bus;
  24        u32 slot;
  25        u32 device;
  26};
  27
  28/*
  29 * IMPORTANT NOTE:
  30 * hb_probes[] and early_root_info_init() is in maintenance mode.
  31 * It only supports K8, Fam10h, Fam11h, and Fam15h_00h-0fh .
  32 * Future processor will rely on information in ACPI.
  33 */
  34static struct amd_hostbridge hb_probes[] __initdata = {
  35        { 0, 0x18, 0x1100 }, /* K8 */
  36        { 0, 0x18, 0x1200 }, /* Family10h */
  37        { 0xff, 0, 0x1200 }, /* Family10h */
  38        { 0, 0x18, 0x1300 }, /* Family11h */
  39        { 0, 0x18, 0x1600 }, /* Family15h */
  40};
  41
  42static struct pci_root_info __init *find_pci_root_info(int node, int link)
  43{
  44        struct pci_root_info *info;
  45
  46        /* find the position */
  47        list_for_each_entry(info, &pci_root_infos, list)
  48                if (info->node == node && info->link == link)
  49                        return info;
  50
  51        return NULL;
  52}
  53
  54/**
  55 * early_root_info_init()
  56 * called before pcibios_scan_root and pci_scan_bus
  57 * fills the mp_bus_to_cpumask array based according
  58 * to the LDT Bus Number Registers found in the northbridge.
  59 */
  60static int __init early_root_info_init(void)
  61{
  62        int i;
  63        unsigned bus;
  64        unsigned slot;
  65        int node;
  66        int link;
  67        int def_node;
  68        int def_link;
  69        struct pci_root_info *info;
  70        u32 reg;
  71        u64 start;
  72        u64 end;
  73        struct range range[RANGE_NUM];
  74        u64 val;
  75        u32 address;
  76        bool found;
  77        struct resource fam10h_mmconf_res, *fam10h_mmconf;
  78        u64 fam10h_mmconf_start;
  79        u64 fam10h_mmconf_end;
  80
  81        if (!early_pci_allowed())
  82                return -1;
  83
  84        found = false;
  85        for (i = 0; i < ARRAY_SIZE(hb_probes); i++) {
  86                u32 id;
  87                u16 device;
  88                u16 vendor;
  89
  90                bus = hb_probes[i].bus;
  91                slot = hb_probes[i].slot;
  92                id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID);
  93                vendor = id & 0xffff;
  94                device = (id>>16) & 0xffff;
  95
  96                if (vendor != PCI_VENDOR_ID_AMD &&
  97                    vendor != PCI_VENDOR_ID_HYGON)
  98                        continue;
  99
 100                if (hb_probes[i].device == device) {
 101                        found = true;
 102                        break;
 103                }
 104        }
 105
 106        if (!found)
 107                return 0;
 108
 109        /*
 110         * We should learn topology and routing information from _PXM and
 111         * _CRS methods in the ACPI namespace.  We extract node numbers
 112         * here to work around BIOSes that don't supply _PXM.
 113         */
 114        for (i = 0; i < AMD_NB_F1_CONFIG_MAP_RANGES; i++) {
 115                int min_bus;
 116                int max_bus;
 117                reg = read_pci_config(bus, slot, 1,
 118                                AMD_NB_F1_CONFIG_MAP_REG + (i << 2));
 119
 120                /* Check if that register is enabled for bus range */
 121                if ((reg & 7) != 3)
 122                        continue;
 123
 124                min_bus = (reg >> 16) & 0xff;
 125                max_bus = (reg >> 24) & 0xff;
 126                node = (reg >> 4) & 0x07;
 127                link = (reg >> 8) & 0x03;
 128
 129                alloc_pci_root_info(min_bus, max_bus, node, link);
 130        }
 131
 132        /*
 133         * The following code extracts routing information for use on old
 134         * systems where Linux doesn't automatically use host bridge _CRS
 135         * methods (or when the user specifies "pci=nocrs").
 136         *
 137         * We only do this through Fam11h, because _CRS should be enough on
 138         * newer systems.
 139         */
 140        if (boot_cpu_data.x86 > 0x11)
 141                return 0;
 142
 143        /* get the default node and link for left over res */
 144        reg = read_pci_config(bus, slot, 0, AMD_NB_F0_NODE_ID);
 145        def_node = (reg >> 8) & 0x07;
 146        reg = read_pci_config(bus, slot, 0, AMD_NB_F0_UNIT_ID);
 147        def_link = (reg >> 8) & 0x03;
 148
 149        memset(range, 0, sizeof(range));
 150        add_range(range, RANGE_NUM, 0, 0, 0xffff + 1);
 151        /* io port resource */
 152        for (i = 0; i < 4; i++) {
 153                reg = read_pci_config(bus, slot, 1, 0xc0 + (i << 3));
 154                if (!(reg & 3))
 155                        continue;
 156
 157                start = reg & 0xfff000;
 158                reg = read_pci_config(bus, slot, 1, 0xc4 + (i << 3));
 159                node = reg & 0x07;
 160                link = (reg >> 4) & 0x03;
 161                end = (reg & 0xfff000) | 0xfff;
 162
 163                info = find_pci_root_info(node, link);
 164                if (!info)
 165                        continue; /* not found */
 166
 167                printk(KERN_DEBUG "node %d link %d: io port [%llx, %llx]\n",
 168                       node, link, start, end);
 169
 170                /* kernel only handle 16 bit only */
 171                if (end > 0xffff)
 172                        end = 0xffff;
 173                update_res(info, start, end, IORESOURCE_IO, 1);
 174                subtract_range(range, RANGE_NUM, start, end + 1);
 175        }
 176        /* add left over io port range to def node/link, [0, 0xffff] */
 177        /* find the position */
 178        info = find_pci_root_info(def_node, def_link);
 179        if (info) {
 180                for (i = 0; i < RANGE_NUM; i++) {
 181                        if (!range[i].end)
 182                                continue;
 183
 184                        update_res(info, range[i].start, range[i].end - 1,
 185                                   IORESOURCE_IO, 1);
 186                }
 187        }
 188
 189        memset(range, 0, sizeof(range));
 190        /* 0xfd00000000-0xffffffffff for HT */
 191        end = cap_resource((0xfdULL<<32) - 1);
 192        end++;
 193        add_range(range, RANGE_NUM, 0, 0, end);
 194
 195        /* need to take out [0, TOM) for RAM*/
 196        address = MSR_K8_TOP_MEM1;
 197        rdmsrl(address, val);
 198        end = (val & 0xffffff800000ULL);
 199        printk(KERN_INFO "TOM: %016llx aka %lldM\n", end, end>>20);
 200        if (end < (1ULL<<32))
 201                subtract_range(range, RANGE_NUM, 0, end);
 202
 203        /* get mmconfig */
 204        fam10h_mmconf = amd_get_mmconfig_range(&fam10h_mmconf_res);
 205        /* need to take out mmconf range */
 206        if (fam10h_mmconf) {
 207                printk(KERN_DEBUG "Fam 10h mmconf %pR\n", fam10h_mmconf);
 208                fam10h_mmconf_start = fam10h_mmconf->start;
 209                fam10h_mmconf_end = fam10h_mmconf->end;
 210                subtract_range(range, RANGE_NUM, fam10h_mmconf_start,
 211                                 fam10h_mmconf_end + 1);
 212        } else {
 213                fam10h_mmconf_start = 0;
 214                fam10h_mmconf_end = 0;
 215        }
 216
 217        /* mmio resource */
 218        for (i = 0; i < 8; i++) {
 219                reg = read_pci_config(bus, slot, 1, 0x80 + (i << 3));
 220                if (!(reg & 3))
 221                        continue;
 222
 223                start = reg & 0xffffff00; /* 39:16 on 31:8*/
 224                start <<= 8;
 225                reg = read_pci_config(bus, slot, 1, 0x84 + (i << 3));
 226                node = reg & 0x07;
 227                link = (reg >> 4) & 0x03;
 228                end = (reg & 0xffffff00);
 229                end <<= 8;
 230                end |= 0xffff;
 231
 232                info = find_pci_root_info(node, link);
 233
 234                if (!info)
 235                        continue;
 236
 237                printk(KERN_DEBUG "node %d link %d: mmio [%llx, %llx]",
 238                       node, link, start, end);
 239                /*
 240                 * some sick allocation would have range overlap with fam10h
 241                 * mmconf range, so need to update start and end.
 242                 */
 243                if (fam10h_mmconf_end) {
 244                        int changed = 0;
 245                        u64 endx = 0;
 246                        if (start >= fam10h_mmconf_start &&
 247                            start <= fam10h_mmconf_end) {
 248                                start = fam10h_mmconf_end + 1;
 249                                changed = 1;
 250                        }
 251
 252                        if (end >= fam10h_mmconf_start &&
 253                            end <= fam10h_mmconf_end) {
 254                                end = fam10h_mmconf_start - 1;
 255                                changed = 1;
 256                        }
 257
 258                        if (start < fam10h_mmconf_start &&
 259                            end > fam10h_mmconf_end) {
 260                                /* we got a hole */
 261                                endx = fam10h_mmconf_start - 1;
 262                                update_res(info, start, endx, IORESOURCE_MEM, 0);
 263                                subtract_range(range, RANGE_NUM, start,
 264                                                 endx + 1);
 265                                printk(KERN_CONT " ==> [%llx, %llx]", start, endx);
 266                                start = fam10h_mmconf_end + 1;
 267                                changed = 1;
 268                        }
 269                        if (changed) {
 270                                if (start <= end) {
 271                                        printk(KERN_CONT " %s [%llx, %llx]", endx ? "and" : "==>", start, end);
 272                                } else {
 273                                        printk(KERN_CONT "%s\n", endx?"":" ==> none");
 274                                        continue;
 275                                }
 276                        }
 277                }
 278
 279                update_res(info, cap_resource(start), cap_resource(end),
 280                                 IORESOURCE_MEM, 1);
 281                subtract_range(range, RANGE_NUM, start, end + 1);
 282                printk(KERN_CONT "\n");
 283        }
 284
 285        /* need to take out [4G, TOM2) for RAM*/
 286        /* SYS_CFG */
 287        address = MSR_AMD64_SYSCFG;
 288        rdmsrl(address, val);
 289        /* TOP_MEM2 is enabled? */
 290        if (val & (1<<21)) {
 291                /* TOP_MEM2 */
 292                address = MSR_K8_TOP_MEM2;
 293                rdmsrl(address, val);
 294                end = (val & 0xffffff800000ULL);
 295                printk(KERN_INFO "TOM2: %016llx aka %lldM\n", end, end>>20);
 296                subtract_range(range, RANGE_NUM, 1ULL<<32, end);
 297        }
 298
 299        /*
 300         * add left over mmio range to def node/link ?
 301         * that is tricky, just record range in from start_min to 4G
 302         */
 303        info = find_pci_root_info(def_node, def_link);
 304        if (info) {
 305                for (i = 0; i < RANGE_NUM; i++) {
 306                        if (!range[i].end)
 307                                continue;
 308
 309                        update_res(info, cap_resource(range[i].start),
 310                                   cap_resource(range[i].end - 1),
 311                                   IORESOURCE_MEM, 1);
 312                }
 313        }
 314
 315        list_for_each_entry(info, &pci_root_infos, list) {
 316                int busnum;
 317                struct pci_root_res *root_res;
 318
 319                busnum = info->busn.start;
 320                printk(KERN_DEBUG "bus: %pR on node %x link %x\n",
 321                       &info->busn, info->node, info->link);
 322                list_for_each_entry(root_res, &info->resources, list)
 323                        printk(KERN_DEBUG "bus: %02x %pR\n",
 324                                       busnum, &root_res->res);
 325        }
 326
 327        return 0;
 328}
 329
 330#define ENABLE_CF8_EXT_CFG      (1ULL << 46)
 331
 332static int amd_bus_cpu_online(unsigned int cpu)
 333{
 334        u64 reg;
 335
 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        return 0;
 342}
 343
 344static 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
 371static int __init pci_io_ecs_init(void)
 372{
 373        int ret;
 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        ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "pci/amd_bus:online",
 384                                amd_bus_cpu_online, NULL);
 385        WARN_ON(ret < 0);
 386
 387        pci_probe |= PCI_HAS_IO_ECS;
 388
 389        return 0;
 390}
 391
 392static int __init amd_postcore_init(void)
 393{
 394        if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
 395            boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
 396                return 0;
 397
 398        early_root_info_init();
 399        pci_io_ecs_init();
 400
 401        return 0;
 402}
 403
 404postcore_initcall(amd_postcore_init);
 405