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
  12 struct 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
  22 static bool pci_use_crs = true;
  23 static bool pci_ignore_seg = false;
  24
  25 static int __init set_use_crs(const struct dmi_system_id *id)
  26 {
  27         pci_use_crs = true;
  28         return 0;
  29 }
  30
  31 static int __init set_nouse_crs(const struct dmi_system_id *id)
  32 {
  33         pci_use_crs = false;
  34         return 0;
  35 }
  36
  37 static 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
  44 static 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
 141 void __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
 168 static 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
 191 static 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
 225 static 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
 237 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
 238 {
 239         return 0;
 240 }
 241
 242 static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
 243 {
 244 }
 245 #endif
 246
 247 static 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
 265 static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci)
 266 {
 267         return setup_mcfg_map(ci);
 268 }
 269
 270 static 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  */
 290 static bool resource_is_pcicfg_ioport(struct resource *res)
 291 {
 292         return (res->flags & IORESOURCE_IO) &&
 293                 res->start == 0xCF8 && res->end == 0xCFF;
 294 }
 295
 296 static 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
 321 static 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
 328 struct 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
 387 int 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
 402 int __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 }