LXR linux/arch/x86/pci/acpi.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/pci.h>
   3#include <linux/acpi.h>
   4#include <linux/init.h>
   5#include <linux/irq.h>
   6#include <linux/dmi.h>
   7#include <linux/slab.h>
   8#include <linux/pci-acpi.h>
   9#include <asm/numa.h>
  10#include <asm/pci_x86.h>
  11
  12struct pci_root_info {
  13        struct acpi_pci_root_info common;
  14        struct pci_sysdata sd;
  15#ifdef  CONFIG_PCI_MMCONFIG
  16        bool mcfg_added;
  17        u8 start_bus;
  18        u8 end_bus;
  19#endif
  20};
  21
  22static bool pci_use_crs = true;
  23static bool pci_ignore_seg = false;
  24
  25static int __init set_use_crs(const struct dmi_system_id *id)
  26{
  27        pci_use_crs = true;
  28        return 0;
  29}
  30
  31static int __init set_nouse_crs(const struct dmi_system_id *id)
  32{
  33        pci_use_crs = false;
  34        return 0;
  35}
  36
  37static int __init set_ignore_seg(const struct dmi_system_id *id)
  38{
  39        printk(KERN_INFO "PCI: %s detected: ignoring ACPI _SEG\n", id->ident);
  40        pci_ignore_seg = true;
  41        return 0;
  42}
  43
  44static const struct dmi_system_id pci_crs_quirks[] __initconst = {
  45        /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
  46        {
  47                .callback = set_use_crs,
  48                .ident = "IBM System x3800",
  49                .matches = {
  50                        DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
  51                        DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
  52                },
  53        },
  54        /* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
  55        /* 2006 AMD HT/VIA system with two host bridges */
  56        {
  57                .callback = set_use_crs,
  58                .ident = "ASRock ALiveSATA2-GLAN",
  59                .matches = {
  60                        DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
  61                },
  62        },
  63        /* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
  64        /* 2006 AMD HT/VIA system with two host bridges */
  65        {
  66                .callback = set_use_crs,
  67                .ident = "ASUS M2V-MX SE",
  68                .matches = {
  69                        DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
  70                        DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
  71                        DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
  72                },
  73        },
  74        /* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */
  75        {
  76                .callback = set_use_crs,
  77                .ident = "MSI MS-7253",
  78                .matches = {
  79                        DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
  80                        DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
  81                        DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
  82                },
  83        },
  84        /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/931368 */
  85        /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1033299 */
  86        {
  87                .callback = set_use_crs,
  88                .ident = "Foxconn K8M890-8237A",
  89                .matches = {
  90                        DMI_MATCH(DMI_BOARD_VENDOR, "Foxconn"),
  91                        DMI_MATCH(DMI_BOARD_NAME, "K8M890-8237A"),
  92                        DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
  93                },
  94        },
  95
  96        /* Now for the blacklist.. */
  97
  98        /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
  99        {
 100                .callback = set_nouse_crs,
 101                .ident = "Dell Studio 1557",
 102                .matches = {
 103                        DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
 104                        DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
 105                        DMI_MATCH(DMI_BIOS_VERSION, "A09"),
 106                },
 107        },
 108        /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
 109        {
 110                .callback = set_nouse_crs,
 111                .ident = "Thinkpad SL510",
 112                .matches = {
 113                        DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
 114                        DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
 115                        DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
 116                },
 117        },
 118        /* https://bugzilla.kernel.org/show_bug.cgi?id=42606 */
 119        {
 120                .callback = set_nouse_crs,
 121                .ident = "Supermicro X8DTH",
 122                .matches = {
 123                        DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
 124                        DMI_MATCH(DMI_PRODUCT_NAME, "X8DTH-i/6/iF/6F"),
 125                        DMI_MATCH(DMI_BIOS_VERSION, "2.0a"),
 126                },
 127        },
 128
 129        /* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */
 130        {
 131                .callback = set_ignore_seg,
 132                .ident = "HP xw9300",
 133                .matches = {
 134                        DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 135                        DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"),
 136                },
 137        },
 138        {}
 139};
 140
 141void __init pci_acpi_crs_quirks(void)
 142{
 143        int year;
 144
 145        if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008) {
 146                if (iomem_resource.end <= 0xffffffff)
 147                        pci_use_crs = false;
 148        }
 149
 150        dmi_check_system(pci_crs_quirks);
 151
 152        /*
 153         * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
 154         * takes precedence over anything we figured out above.
 155         */
 156        if (pci_probe & PCI_ROOT_NO_CRS)
 157                pci_use_crs = false;
 158        else if (pci_probe & PCI_USE__CRS)
 159                pci_use_crs = true;
 160
 161        printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
 162               "if necessary, use \"pci=%s\" and report a bug\n",
 163               pci_use_crs ? "Using" : "Ignoring",
 164               pci_use_crs ? "nocrs" : "use_crs");
 165}
 166
 167#ifdef  CONFIG_PCI_MMCONFIG
 168static int check_segment(u16 seg, struct device *dev, char *estr)
 169{
 170        if (seg) {
 171                dev_err(dev,
 172                        "%s can't access PCI configuration "
 173                        "space under this host bridge.\n",
 174                        estr);
 175                return -EIO;
 176        }
 177
 178        /*
 179         * Failure in adding MMCFG information is not fatal,
 180         * just can't access extended configuration space of
 181         * devices under this host bridge.
 182         */
 183        dev_warn(dev,
 184                 "%s can't access extended PCI configuration "
 185                 "space under this bridge.\n",
 186                 estr);
 187
 188        return 0;
 189}
 190
 191static int setup_mcfg_map(struct acpi_pci_root_info *ci)
 192{
 193        int result, seg;
 194        struct pci_root_info *info;
 195        struct acpi_pci_root *root = ci->root;
 196        struct device *dev = &ci->bridge->dev;
 197
 198        info = container_of(ci, struct pci_root_info, common);
 199        info->start_bus = (u8)root->secondary.start;
 200        info->end_bus = (u8)root->secondary.end;
 201        info->mcfg_added = false;
 202        seg = info->sd.domain;
 203
 204        /* return success if MMCFG is not in use */
 205        if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
 206                return 0;
 207
 208        if (!(pci_probe & PCI_PROBE_MMCONF))
 209                return check_segment(seg, dev, "MMCONFIG is disabled,");
 210
 211        result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus,
 212                                     root->mcfg_addr);
 213        if (result == 0) {
 214                /* enable MMCFG if it hasn't been enabled yet */
 215                if (raw_pci_ext_ops == NULL)
 216                        raw_pci_ext_ops = &pci_mmcfg;
 217                info->mcfg_added = true;
 218        } else if (result != -EEXIST)
 219                return check_segment(seg, dev,
 220                         "fail to add MMCONFIG information,");
 221
 222        return 0;
 223}
 224
 225static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
 226{
 227        struct pci_root_info *info;
 228
 229        info = container_of(ci, struct pci_root_info, common);
 230        if (info->mcfg_added) {
 231                pci_mmconfig_delete(info->sd.domain,
 232                                    info->start_bus, info->end_bus);
 233                info->mcfg_added = false;
 234        }
 235}
 236#else
 237static int setup_mcfg_map(struct acpi_pci_root_info *ci)
 238{
 239        return 0;
 240}
 241
 242static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
 243{
 244}
 245#endif
 246
 247static int pci_acpi_root_get_node(struct acpi_pci_root *root)
 248{
 249        int busnum = root->secondary.start;
 250        struct acpi_device *device = root->device;
 251        int node = acpi_get_node(device->handle);
 252
 253        if (node == NUMA_NO_NODE) {
 254                node = x86_pci_root_bus_node(busnum);
 255                if (node != 0 && node != NUMA_NO_NODE)
 256                        dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
 257                                node);
 258        }
 259        if (node != NUMA_NO_NODE && !node_online(node))
 260                node = NUMA_NO_NODE;
 261
 262        return node;
 263}
 264
 265static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci)
 266{
 267        return setup_mcfg_map(ci);
 268}
 269
 270static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
 271{
 272        teardown_mcfg_map(ci);
 273        kfree(container_of(ci, struct pci_root_info, common));
 274}
 275
 276/*
 277 * An IO port or MMIO resource assigned to a PCI host bridge may be
 278 * consumed by the host bridge itself or available to its child
 279 * bus/devices. The ACPI specification defines a bit (Producer/Consumer)
 280 * to tell whether the resource is consumed by the host bridge itself,
 281 * but firmware hasn't used that bit consistently, so we can't rely on it.
 282 *
 283 * On x86 and IA64 platforms, all IO port and MMIO resources are assumed
 284 * to be available to child bus/devices except one special case:
 285 *     IO port [0xCF8-0xCFF] is consumed by the host bridge itself
 286 *     to access PCI configuration space.
 287 *
 288 * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF].
 289 */
 290static bool resource_is_pcicfg_ioport(struct resource *res)
 291{
 292        return (res->flags & IORESOURCE_IO) &&
 293                res->start == 0xCF8 && res->end == 0xCFF;
 294}
 295
 296static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
 297{
 298        struct acpi_device *device = ci->bridge;
 299        int busnum = ci->root->secondary.start;
 300        struct resource_entry *entry, *tmp;
 301        int status;
 302
 303        status = acpi_pci_probe_root_resources(ci);
 304        if (pci_use_crs) {
 305                resource_list_for_each_entry_safe(entry, tmp, &ci->resources)
 306                        if (resource_is_pcicfg_ioport(entry->res))
 307                                resource_list_destroy_entry(entry);
 308                return status;
 309        }
 310
 311        resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
 312                dev_printk(KERN_DEBUG, &device->dev,
 313                           "host bridge window %pR (ignored)\n", entry->res);
 314                resource_list_destroy_entry(entry);
 315        }
 316        x86_pci_root_bus_resources(busnum, &ci->resources);
 317
 318        return 0;
 319}
 320
 321static struct acpi_pci_root_ops acpi_pci_root_ops = {
 322        .pci_ops = &pci_root_ops,
 323        .init_info = pci_acpi_root_init_info,
 324        .release_info = pci_acpi_root_release_info,
 325        .prepare_resources = pci_acpi_root_prepare_resources,
 326};
 327
 328struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 329{
 330        int domain = root->segment;
 331        int busnum = root->secondary.start;
 332        int node = pci_acpi_root_get_node(root);
 333        struct pci_bus *bus;
 334
 335        if (pci_ignore_seg)
 336                root->segment = domain = 0;
 337
 338        if (domain && !pci_domains_supported) {
 339                printk(KERN_WARNING "pci_bus %04x:%02x: "
 340                       "ignored (multiple domains not supported)\n",
 341                       domain, busnum);
 342                return NULL;
 343        }
 344
 345        bus = pci_find_bus(domain, busnum);
 346        if (bus) {
 347                /*
 348                 * If the desired bus has been scanned already, replace
 349                 * its bus->sysdata.
 350                 */
 351                struct pci_sysdata sd = {
 352                        .domain = domain,
 353                        .node = node,
 354                        .companion = root->device
 355                };
 356
 357                memcpy(bus->sysdata, &sd, sizeof(sd));
 358        } else {
 359                struct pci_root_info *info;
 360
 361                info = kzalloc_node(sizeof(*info), GFP_KERNEL, node);
 362                if (!info)
 363                        dev_err(&root->device->dev,
 364                                "pci_bus %04x:%02x: ignored (out of memory)\n",
 365                                domain, busnum);
 366                else {
 367                        info->sd.domain = domain;
 368                        info->sd.node = node;
 369                        info->sd.companion = root->device;
 370                        bus = acpi_pci_root_create(root, &acpi_pci_root_ops,
 371                                                   &info->common, &info->sd);
 372                }
 373        }
 374
 375        /* After the PCI-E bus has been walked and all devices discovered,
 376         * configure any settings of the fabric that might be necessary.
 377         */
 378        if (bus) {
 379                struct pci_bus *child;
 380                list_for_each_entry(child, &bus->children, node)
 381                        pcie_bus_configure_settings(child);
 382        }
 383
 384        return bus;
 385}
 386
 387int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 388{
 389        /*
 390         * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
 391         * here, pci_create_root_bus() has been called by someone else and
 392         * sysdata is likely to be different from what we expect.  Let it go in
 393         * that case.
 394         */
 395        if (!bridge->dev.parent) {
 396                struct pci_sysdata *sd = bridge->bus->sysdata;
 397                ACPI_COMPANION_SET(&bridge->dev, sd->companion);
 398        }
 399        return 0;
 400}
 401
 402int __init pci_acpi_init(void)
 403{
 404        struct pci_dev *dev = NULL;
 405
 406        if (acpi_noirq)
 407                return -ENODEV;
 408
 409        printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
 410        acpi_irq_penalty_init();
 411        pcibios_enable_irq = acpi_pci_irq_enable;
 412        pcibios_disable_irq = acpi_pci_irq_disable;
 413        x86_init.pci.init_irq = x86_init_noop;
 414
 415        if (pci_routeirq) {
 416                /*
 417                 * PCI IRQ routing is set up by pci_enable_device(), but we
 418                 * also do it here in case there are still broken drivers that
 419                 * don't use pci_enable_device().
 420                 */
 421                printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
 422                for_each_pci_dev(dev)
 423                        acpi_pci_irq_enable(dev);
 424        }
 425
 426        return 0;
 427}
 428