rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 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 | } |