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