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
  11 struct 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
  21 static bool pci_use_crs = true;
  22 static bool pci_ignore_seg = false;
  23
  24 static int __init set_use_crs(const struct dmi_system_id *id)
  25 {
  26         pci_use_crs = true;
  27         return 0;
  28 }
  29
  30 static int __init set_nouse_crs(const struct dmi_system_id *id)
  31 {
  32         pci_use_crs = false;
  33         return 0;
  34 }
  35
  36 static 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
  43 static 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
 130 void __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
 157 static 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
 180 static 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
 214 static 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
 226 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
 227 {
 228         return 0;
 229 }
 230
 231 static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
 232 {
 233 }
 234 #endif
 235
 236 static 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
 254 static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci)
 255 {
 256         return setup_mcfg_map(ci);
 257 }
 258
 259 static 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  */
 279 static bool resource_is_pcicfg_ioport(struct resource *res)
 280 {
 281         return (res->flags & IORESOURCE_IO) &&
 282                 res->start == 0xCF8 && res->end == 0xCFF;
 283 }
 284
 285 static 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
 310 static 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
 317 struct 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
 376 int 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
 391 int __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 }