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 /* https://bugzilla.kernel.org/show_bug.cgi?id=42606 */ 118 { 119 .callback = set_nouse_crs, 120 .ident = "Supermicro X8DTH", 121 .matches = { 122 DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), 123 DMI_MATCH(DMI_PRODUCT_NAME, "X8DTH-i/6/iF/6F"), 124 DMI_MATCH(DMI_BIOS_VERSION, "2.0a"), 125 }, 126 }, 127 128 /* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */ 129 { 130 .callback = set_ignore_seg, 131 .ident = "HP xw9300", 132 .matches = { 133 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 134 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"), 135 }, 136 }, 137 {} 138 }; 139 140 void __init pci_acpi_crs_quirks(void) 141 { 142 int year; 143 144 if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008) { 145 if (iomem_resource.end <= 0xffffffff) 146 pci_use_crs = false; 147 } 148 149 dmi_check_system(pci_crs_quirks); 150 151 /* 152 * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that 153 * takes precedence over anything we figured out above. 154 */ 155 if (pci_probe & PCI_ROOT_NO_CRS) 156 pci_use_crs = false; 157 else if (pci_probe & PCI_USE__CRS) 158 pci_use_crs = true; 159 160 printk(KERN_INFO "PCI: %s host bridge windows from ACPI; " 161 "if necessary, use \"pci=%s\" and report a bug\n", 162 pci_use_crs ? "Using" : "Ignoring", 163 pci_use_crs ? "nocrs" : "use_crs"); 164 } 165 166 #ifdef CONFIG_PCI_MMCONFIG 167 static int check_segment(u16 seg, struct device *dev, char *estr) 168 { 169 if (seg) { 170 dev_err(dev, 171 "%s can't access PCI configuration " 172 "space under this host bridge.\n", 173 estr); 174 return -EIO; 175 } 176 177 /* 178 * Failure in adding MMCFG information is not fatal, 179 * just can't access extended configuration space of 180 * devices under this host bridge. 181 */ 182 dev_warn(dev, 183 "%s can't access extended PCI configuration " 184 "space under this bridge.\n", 185 estr); 186 187 return 0; 188 } 189 190 static int setup_mcfg_map(struct acpi_pci_root_info *ci) 191 { 192 int result, seg; 193 struct pci_root_info *info; 194 struct acpi_pci_root *root = ci->root; 195 struct device *dev = &ci->bridge->dev; 196 197 info = container_of(ci, struct pci_root_info, common); 198 info->start_bus = (u8)root->secondary.start; 199 info->end_bus = (u8)root->secondary.end; 200 info->mcfg_added = false; 201 seg = info->sd.domain; 202 203 /* return success if MMCFG is not in use */ 204 if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg) 205 return 0; 206 207 if (!(pci_probe & PCI_PROBE_MMCONF)) 208 return check_segment(seg, dev, "MMCONFIG is disabled,"); 209 210 result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus, 211 root->mcfg_addr); 212 if (result == 0) { 213 /* enable MMCFG if it hasn't been enabled yet */ 214 if (raw_pci_ext_ops == NULL) 215 raw_pci_ext_ops = &pci_mmcfg; 216 info->mcfg_added = true; 217 } else if (result != -EEXIST) 218 return check_segment(seg, dev, 219 "fail to add MMCONFIG information,"); 220 221 return 0; 222 } 223 224 static void teardown_mcfg_map(struct acpi_pci_root_info *ci) 225 { 226 struct pci_root_info *info; 227 228 info = container_of(ci, struct pci_root_info, common); 229 if (info->mcfg_added) { 230 pci_mmconfig_delete(info->sd.domain, 231 info->start_bus, info->end_bus); 232 info->mcfg_added = false; 233 } 234 } 235 #else 236 static int setup_mcfg_map(struct acpi_pci_root_info *ci) 237 { 238 return 0; 239 } 240 241 static void teardown_mcfg_map(struct acpi_pci_root_info *ci) 242 { 243 } 244 #endif 245 246 static int pci_acpi_root_get_node(struct acpi_pci_root *root) 247 { 248 int busnum = root->secondary.start; 249 struct acpi_device *device = root->device; 250 int node = acpi_get_node(device->handle); 251 252 if (node == NUMA_NO_NODE) { 253 node = x86_pci_root_bus_node(busnum); 254 if (node != 0 && node != NUMA_NO_NODE) 255 dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n", 256 node); 257 } 258 if (node != NUMA_NO_NODE && !node_online(node)) 259 node = NUMA_NO_NODE; 260 261 return node; 262 } 263 264 static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci) 265 { 266 return setup_mcfg_map(ci); 267 } 268 269 static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci) 270 { 271 teardown_mcfg_map(ci); 272 kfree(container_of(ci, struct pci_root_info, common)); 273 } 274 275 /* 276 * An IO port or MMIO resource assigned to a PCI host bridge may be 277 * consumed by the host bridge itself or available to its child 278 * bus/devices. The ACPI specification defines a bit (Producer/Consumer) 279 * to tell whether the resource is consumed by the host bridge itself, 280 * but firmware hasn't used that bit consistently, so we can't rely on it. 281 * 282 * On x86 and IA64 platforms, all IO port and MMIO resources are assumed 283 * to be available to child bus/devices except one special case: 284 * IO port [0xCF8-0xCFF] is consumed by the host bridge itself 285 * to access PCI configuration space. 286 * 287 * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF]. 288 */ 289 static bool resource_is_pcicfg_ioport(struct resource *res) 290 { 291 return (res->flags & IORESOURCE_IO) && 292 res->start == 0xCF8 && res->end == 0xCFF; 293 } 294 295 static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci) 296 { 297 struct acpi_device *device = ci->bridge; 298 int busnum = ci->root->secondary.start; 299 struct resource_entry *entry, *tmp; 300 int status; 301 302 status = acpi_pci_probe_root_resources(ci); 303 if (pci_use_crs) { 304 resource_list_for_each_entry_safe(entry, tmp, &ci->resources) 305 if (resource_is_pcicfg_ioport(entry->res)) 306 resource_list_destroy_entry(entry); 307 return status; 308 } 309 310 resource_list_for_each_entry_safe(entry, tmp, &ci->resources) { 311 dev_printk(KERN_DEBUG, &device->dev, 312 "host bridge window %pR (ignored)\n", entry->res); 313 resource_list_destroy_entry(entry); 314 } 315 x86_pci_root_bus_resources(busnum, &ci->resources); 316 317 return 0; 318 } 319 320 static struct acpi_pci_root_ops acpi_pci_root_ops = { 321 .pci_ops = &pci_root_ops, 322 .init_info = pci_acpi_root_init_info, 323 .release_info = pci_acpi_root_release_info, 324 .prepare_resources = pci_acpi_root_prepare_resources, 325 }; 326 327 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) 328 { 329 int domain = root->segment; 330 int busnum = root->secondary.start; 331 int node = pci_acpi_root_get_node(root); 332 struct pci_bus *bus; 333 334 if (pci_ignore_seg) 335 root->segment = domain = 0; 336 337 if (domain && !pci_domains_supported) { 338 printk(KERN_WARNING "pci_bus %04x:%02x: " 339 "ignored (multiple domains not supported)\n", 340 domain, busnum); 341 return NULL; 342 } 343 344 bus = pci_find_bus(domain, busnum); 345 if (bus) { 346 /* 347 * If the desired bus has been scanned already, replace 348 * its bus->sysdata. 349 */ 350 struct pci_sysdata sd = { 351 .domain = domain, 352 .node = node, 353 .companion = root->device 354 }; 355 356 memcpy(bus->sysdata, &sd, sizeof(sd)); 357 } else { 358 struct pci_root_info *info; 359 360 info = kzalloc_node(sizeof(*info), GFP_KERNEL, node); 361 if (!info) 362 dev_err(&root->device->dev, 363 "pci_bus %04x:%02x: ignored (out of memory)\n", 364 domain, busnum); 365 else { 366 info->sd.domain = domain; 367 info->sd.node = node; 368 info->sd.companion = root->device; 369 bus = acpi_pci_root_create(root, &acpi_pci_root_ops, 370 &info->common, &info->sd); 371 } 372 } 373 374 /* After the PCI-E bus has been walked and all devices discovered, 375 * configure any settings of the fabric that might be necessary. 376 */ 377 if (bus) { 378 struct pci_bus *child; 379 list_for_each_entry(child, &bus->children, node) 380 pcie_bus_configure_settings(child); 381 } 382 383 return bus; 384 } 385 386 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) 387 { 388 /* 389 * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL 390 * here, pci_create_root_bus() has been called by someone else and 391 * sysdata is likely to be different from what we expect. Let it go in 392 * that case. 393 */ 394 if (!bridge->dev.parent) { 395 struct pci_sysdata *sd = bridge->bus->sysdata; 396 ACPI_COMPANION_SET(&bridge->dev, sd->companion); 397 } 398 return 0; 399 } 400 401 int __init pci_acpi_init(void) 402 { 403 struct pci_dev *dev = NULL; 404 405 if (acpi_noirq) 406 return -ENODEV; 407 408 printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n"); 409 acpi_irq_penalty_init(); 410 pcibios_enable_irq = acpi_pci_irq_enable; 411 pcibios_disable_irq = acpi_pci_irq_disable; 412 x86_init.pci.init_irq = x86_init_noop; 413 414 if (pci_routeirq) { 415 /* 416 * PCI IRQ routing is set up by pci_enable_device(), but we 417 * also do it here in case there are still broken drivers that 418 * don't use pci_enable_device(). 419 */ 420 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n"); 421 for_each_pci_dev(dev) 422 acpi_pci_irq_enable(dev); 423 } 424 425 return 0; 426 } 427