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

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