root/arch/x86/pci/acpi.c

DEFINITIONS

1. set_use_crs
2. set_nouse_crs
3. set_ignore_seg
4. pci_acpi_crs_quirks
5. check_segment
6. setup_mcfg_map
7. teardown_mcfg_map
8. setup_mcfg_map
9. teardown_mcfg_map
10. pci_acpi_root_get_node
11. pci_acpi_root_init_info
12. pci_acpi_root_release_info
13. resource_is_pcicfg_ioport
14. pci_acpi_root_prepare_resources
15. pci_acpi_scan_root
16. pcibios_root_bridge_prepare
17. pci_acpi_init

   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 = dmi_get_bios_year();
 144 
 145         if (year >= 0 && year < 2008 && iomem_resource.end <= 0xffffffff)
 146                 pci_use_crs = false;
 147 
 148         dmi_check_system(pci_crs_quirks);
 149 
 150         /*
 151          * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
 152          * takes precedence over anything we figured out above.
 153          */
 154         if (pci_probe & PCI_ROOT_NO_CRS)
 155                 pci_use_crs = false;
 156         else if (pci_probe & PCI_USE__CRS)
 157                 pci_use_crs = true;
 158 
 159         printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
 160                "if necessary, use \"pci=%s\" and report a bug\n",
 161                pci_use_crs ? "Using" : "Ignoring",
 162                pci_use_crs ? "nocrs" : "use_crs");
 163 }
 164 
 165 #ifdef  CONFIG_PCI_MMCONFIG
 166 static int check_segment(u16 seg, struct device *dev, char *estr)
 167 {
 168         if (seg) {
 169                 dev_err(dev,
 170                         "%s can't access PCI configuration "
 171                         "space under this host bridge.\n",
 172                         estr);
 173                 return -EIO;
 174         }
 175 
 176         /*
 177          * Failure in adding MMCFG information is not fatal,
 178          * just can't access extended configuration space of
 179          * devices under this host bridge.
 180          */
 181         dev_warn(dev,
 182                  "%s can't access extended PCI configuration "
 183                  "space under this bridge.\n",
 184                  estr);
 185 
 186         return 0;
 187 }
 188 
 189 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
 190 {
 191         int result, seg;
 192         struct pci_root_info *info;
 193         struct acpi_pci_root *root = ci->root;
 194         struct device *dev = &ci->bridge->dev;
 195 
 196         info = container_of(ci, struct pci_root_info, common);
 197         info->start_bus = (u8)root->secondary.start;
 198         info->end_bus = (u8)root->secondary.end;
 199         info->mcfg_added = false;
 200         seg = info->sd.domain;
 201 
 202         /* return success if MMCFG is not in use */
 203         if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
 204                 return 0;
 205 
 206         if (!(pci_probe & PCI_PROBE_MMCONF))
 207                 return check_segment(seg, dev, "MMCONFIG is disabled,");
 208 
 209         result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus,
 210                                      root->mcfg_addr);
 211         if (result == 0) {
 212                 /* enable MMCFG if it hasn't been enabled yet */
 213                 if (raw_pci_ext_ops == NULL)
 214                         raw_pci_ext_ops = &pci_mmcfg;
 215                 info->mcfg_added = true;
 216         } else if (result != -EEXIST)
 217                 return check_segment(seg, dev,
 218                          "fail to add MMCONFIG information,");
 219 
 220         return 0;
 221 }
 222 
 223 static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
 224 {
 225         struct pci_root_info *info;
 226 
 227         info = container_of(ci, struct pci_root_info, common);
 228         if (info->mcfg_added) {
 229                 pci_mmconfig_delete(info->sd.domain,
 230                                     info->start_bus, info->end_bus);
 231                 info->mcfg_added = false;
 232         }
 233 }
 234 #else
 235 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
 236 {
 237         return 0;
 238 }
 239 
 240 static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
 241 {
 242 }
 243 #endif
 244 
 245 static int pci_acpi_root_get_node(struct acpi_pci_root *root)
 246 {
 247         int busnum = root->secondary.start;
 248         struct acpi_device *device = root->device;
 249         int node = acpi_get_node(device->handle);
 250 
 251         if (node == NUMA_NO_NODE) {
 252                 node = x86_pci_root_bus_node(busnum);
 253                 if (node != 0 && node != NUMA_NO_NODE)
 254                         dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
 255                                 node);
 256         }
 257         if (node != NUMA_NO_NODE && !node_online(node))
 258                 node = NUMA_NO_NODE;
 259 
 260         return node;
 261 }
 262 
 263 static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci)
 264 {
 265         return setup_mcfg_map(ci);
 266 }
 267 
 268 static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
 269 {
 270         teardown_mcfg_map(ci);
 271         kfree(container_of(ci, struct pci_root_info, common));
 272 }
 273 
 274 /*
 275  * An IO port or MMIO resource assigned to a PCI host bridge may be
 276  * consumed by the host bridge itself or available to its child
 277  * bus/devices. The ACPI specification defines a bit (Producer/Consumer)
 278  * to tell whether the resource is consumed by the host bridge itself,
 279  * but firmware hasn't used that bit consistently, so we can't rely on it.
 280  *
 281  * On x86 and IA64 platforms, all IO port and MMIO resources are assumed
 282  * to be available to child bus/devices except one special case:
 283  *     IO port [0xCF8-0xCFF] is consumed by the host bridge itself
 284  *     to access PCI configuration space.
 285  *
 286  * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF].
 287  */
 288 static bool resource_is_pcicfg_ioport(struct resource *res)
 289 {
 290         return (res->flags & IORESOURCE_IO) &&
 291                 res->start == 0xCF8 && res->end == 0xCFF;
 292 }
 293 
 294 static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
 295 {
 296         struct acpi_device *device = ci->bridge;
 297         int busnum = ci->root->secondary.start;
 298         struct resource_entry *entry, *tmp;
 299         int status;
 300 
 301         status = acpi_pci_probe_root_resources(ci);
 302         if (pci_use_crs) {
 303                 resource_list_for_each_entry_safe(entry, tmp, &ci->resources)
 304                         if (resource_is_pcicfg_ioport(entry->res))
 305                                 resource_list_destroy_entry(entry);
 306                 return status;
 307         }
 308 
 309         resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
 310                 dev_printk(KERN_DEBUG, &device->dev,
 311                            "host bridge window %pR (ignored)\n", entry->res);
 312                 resource_list_destroy_entry(entry);
 313         }
 314         x86_pci_root_bus_resources(busnum, &ci->resources);
 315 
 316         return 0;
 317 }
 318 
 319 static struct acpi_pci_root_ops acpi_pci_root_ops = {
 320         .pci_ops = &pci_root_ops,
 321         .init_info = pci_acpi_root_init_info,
 322         .release_info = pci_acpi_root_release_info,
 323         .prepare_resources = pci_acpi_root_prepare_resources,
 324 };
 325 
 326 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 327 {
 328         int domain = root->segment;
 329         int busnum = root->secondary.start;
 330         int node = pci_acpi_root_get_node(root);
 331         struct pci_bus *bus;
 332 
 333         if (pci_ignore_seg)
 334                 root->segment = domain = 0;
 335 
 336         if (domain && !pci_domains_supported) {
 337                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 338                        "ignored (multiple domains not supported)\n",
 339                        domain, busnum);
 340                 return NULL;
 341         }
 342 
 343         bus = pci_find_bus(domain, busnum);
 344         if (bus) {
 345                 /*
 346                  * If the desired bus has been scanned already, replace
 347                  * its bus->sysdata.
 348                  */
 349                 struct pci_sysdata sd = {
 350                         .domain = domain,
 351                         .node = node,
 352                         .companion = root->device
 353                 };
 354 
 355                 memcpy(bus->sysdata, &sd, sizeof(sd));
 356         } else {
 357                 struct pci_root_info *info;
 358 
 359                 info = kzalloc(sizeof(*info), GFP_KERNEL);
 360                 if (!info)
 361                         dev_err(&root->device->dev,
 362                                 "pci_bus %04x:%02x: ignored (out of memory)\n",
 363                                 domain, busnum);
 364                 else {
 365                         info->sd.domain = domain;
 366                         info->sd.node = node;
 367                         info->sd.companion = root->device;
 368                         bus = acpi_pci_root_create(root, &acpi_pci_root_ops,
 369                                                    &info->common, &info->sd);
 370                 }
 371         }
 372 
 373         /* After the PCI-E bus has been walked and all devices discovered,
 374          * configure any settings of the fabric that might be necessary.
 375          */
 376         if (bus) {
 377                 struct pci_bus *child;
 378                 list_for_each_entry(child, &bus->children, node)
 379                         pcie_bus_configure_settings(child);
 380         }
 381 
 382         return bus;
 383 }
 384 
 385 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 386 {
 387         /*
 388          * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
 389          * here, pci_create_root_bus() has been called by someone else and
 390          * sysdata is likely to be different from what we expect.  Let it go in
 391          * that case.
 392          */
 393         if (!bridge->dev.parent) {
 394                 struct pci_sysdata *sd = bridge->bus->sysdata;
 395                 ACPI_COMPANION_SET(&bridge->dev, sd->companion);
 396         }
 397         return 0;
 398 }
 399 
 400 int __init pci_acpi_init(void)
 401 {
 402         struct pci_dev *dev = NULL;
 403 
 404         if (acpi_noirq)
 405                 return -ENODEV;
 406 
 407         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
 408         acpi_irq_penalty_init();
 409         pcibios_enable_irq = acpi_pci_irq_enable;
 410         pcibios_disable_irq = acpi_pci_irq_disable;
 411         x86_init.pci.init_irq = x86_init_noop;
 412 
 413         if (pci_routeirq) {
 414                 /*
 415                  * PCI IRQ routing is set up by pci_enable_device(), but we
 416                  * also do it here in case there are still broken drivers that
 417                  * don't use pci_enable_device().
 418                  */
 419                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
 420                 for_each_pci_dev(dev)
 421                         acpi_pci_irq_enable(dev);
 422         }
 423 
 424         return 0;
 425 }