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 } 426