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 } 417