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 } 428