1 // SPDX-License-Identifier: GPL-2.0
3 #define pr_fmt(fmt) "PCI: " fmt
5 #include <linux/pci.h>
11 #include <linux/pci-acpi.h>
43 	pr_info("%s detected: ignoring ACPI _SEG\n", id->ident);  in set_ignore_seg()
51 	        id->ident);  in set_no_e820()
70 		.ident = "ASRock ALiveSATA2-GLAN",
72 			DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
79 		.ident = "ASUS M2V-MX SE",
82 			DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
89 		.ident = "MSI MS-7253",
91 			DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
92 			DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
96 	/* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/931368 */
97 	/* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1033299 */
100 		.ident = "Foxconn K8M890-8237A",
103 			DMI_MATCH(DMI_BOARD_NAME, "K8M890-8237A"),
136 			DMI_MATCH(DMI_PRODUCT_NAME, "X8DTH-i/6/iF/6F"),
146 			DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
153 	 * an E820 reserved region that covers the entire 32-bit host
155 	 * _CRS means no space is available for hot-added or uninitialized
156 	 * PCI devices.  This typically breaks I2C controllers for touchpads
157 	 * and hot-added Thunderbolt devices.  See the commit log for
170 	 * The Acer Spin 5 (SP513-54N) has the same E820 reservation covering
171 	 * the entire _CRS 32-bit window issue as the Lenovo *IIL* models.
176 		.ident = "Acer Spin 5 (SP513-54N)",
179 			DMI_MATCH(DMI_PRODUCT_NAME, "Spin SP513-54N"),
184 	 * Clevo X170KM-G barebones have the same E820 reservation covering
185 	 * the entire _CRS 32-bit window issue as the Lenovo *IIL* models.
190 		.ident = "Clevo X170KM-G Barebone",
192 			DMI_MATCH(DMI_BOARD_NAME, "X170KM-G"),
207 	 * hidden PCI device BARs, etc) in PCI host bridge _CRS.  This is a  in pci_acpi_crs_quirks()
214 	 * leaving none for hot-added or uninitialized devices.  These E820  in pci_acpi_crs_quirks()
216 	 * clipping by default for post-2022 machines.  in pci_acpi_crs_quirks()
218 	 * We already have quirks to disable clipping for pre-2023  in pci_acpi_crs_quirks()
220 	 * post-2022 machines that incorrectly include unusable space in  in pci_acpi_crs_quirks()
229 	 * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that  in pci_acpi_crs_quirks()
237 	pr_info("%s host bridge windows from ACPI; if necessary, use \"pci=%s\" and report a bug\n",  in pci_acpi_crs_quirks()
241 	/* "pci=use_e820"/"pci=no_e820" on the kernel cmdline takes precedence */  in pci_acpi_crs_quirks()
250 		pr_info("Please notify linux-pci@vger.kernel.org so future kernels can do this automatically\n");  in pci_acpi_crs_quirks()
259 		return -EIO;  in check_segment()
277 	struct acpi_pci_root *root = ci->root;  in setup_mcfg_map()
278 	struct device *dev = &ci->bridge->dev;  in setup_mcfg_map()
281 	info->start_bus = (u8)root->secondary.start;  in setup_mcfg_map()
282 	info->end_bus = (u8)root->secondary.end;  in setup_mcfg_map()
283 	info->mcfg_added = false;  in setup_mcfg_map()
284 	seg = info->sd.domain;  in setup_mcfg_map()
287 		&root->secondary, &root->mcfg_addr);  in setup_mcfg_map()
296 	result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus,  in setup_mcfg_map()
297 				     root->mcfg_addr);  in setup_mcfg_map()
302 		info->mcfg_added = true;  in setup_mcfg_map()
303 	} else if (result != -EEXIST)  in setup_mcfg_map()
315 	if (info->mcfg_added) {  in teardown_mcfg_map()
316 		pci_mmconfig_delete(info->sd.domain,  in teardown_mcfg_map()
317 				    info->start_bus, info->end_bus);  in teardown_mcfg_map()
318 		info->mcfg_added = false;  in teardown_mcfg_map()
334 	int busnum = root->secondary.start;  in pci_acpi_root_get_node()
335 	struct acpi_device *device = root->device;  in pci_acpi_root_get_node()
336 	int node = acpi_get_node(device->handle);  in pci_acpi_root_get_node()
341 …dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent…  in pci_acpi_root_get_node()
362  * An IO port or MMIO resource assigned to a PCI host bridge may be
370  *     IO port [0xCF8-0xCFF] is consumed by the host bridge itself
371  *     to access PCI configuration space.
373  * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF].
377 	return (res->flags & IORESOURCE_IO) &&  in resource_is_pcicfg_ioport()
378 		res->start == 0xCF8 && res->end == 0xCFF;  in resource_is_pcicfg_ioport()
383 	struct acpi_device *device = ci->bridge;  in pci_acpi_root_prepare_resources()
384 	int busnum = ci->root->secondary.start;  in pci_acpi_root_prepare_resources()
391 		resource_list_for_each_entry_safe(entry, tmp, &ci->resources)  in pci_acpi_root_prepare_resources()
392 			if (resource_is_pcicfg_ioport(entry->res))  in pci_acpi_root_prepare_resources()
397 	resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {  in pci_acpi_root_prepare_resources()
398 		dev_printk(KERN_DEBUG, &device->dev,  in pci_acpi_root_prepare_resources()
399 			   "host bridge window %pR (ignored)\n", entry->res);  in pci_acpi_root_prepare_resources()
402 	x86_pci_root_bus_resources(busnum, &ci->resources);  in pci_acpi_root_prepare_resources()
416 	int domain = root->segment;  in pci_acpi_scan_root()  local
417 	int busnum = root->secondary.start;  in pci_acpi_scan_root()
422 		root->segment = domain = 0;  in pci_acpi_scan_root()
424 	if (domain && !pci_domains_supported) {  in pci_acpi_scan_root()
426 		        domain, busnum);  in pci_acpi_scan_root()
430 	bus = pci_find_bus(domain, busnum);  in pci_acpi_scan_root()
434 		 * its bus->sysdata.  in pci_acpi_scan_root()
437 			.domain = domain,  in pci_acpi_scan_root()
439 			.companion = root->device  in pci_acpi_scan_root()
442 		memcpy(bus->sysdata, &sd, sizeof(sd));  in pci_acpi_scan_root()
448 			dev_err(&root->device->dev,  in pci_acpi_scan_root()
450 				domain, busnum);  in pci_acpi_scan_root()
452 			info->sd.domain = domain;  in pci_acpi_scan_root()
453 			info->sd.node = node;  in pci_acpi_scan_root()
454 			info->sd.companion = root->device;  in pci_acpi_scan_root()
456 						   &info->common, &info->sd);  in pci_acpi_scan_root()
460 	/* After the PCI-E bus has been walked and all devices discovered,  in pci_acpi_scan_root()
465 		list_for_each_entry(child, &bus->children, node)  in pci_acpi_scan_root()
480 	if (!bridge->dev.parent) {  in pcibios_root_bridge_prepare()
481 		struct pci_sysdata *sd = bridge->bus->sysdata;  in pcibios_root_bridge_prepare()
482 		ACPI_COMPANION_SET(&bridge->dev, sd->companion);  in pcibios_root_bridge_prepare()
492 		return -ENODEV;  in pci_acpi_init()
498 	x86_init.pci.init_irq = x86_init_noop;  in pci_acpi_init()
502 		 * PCI IRQ routing is set up by pci_enable_device(), but we  in pci_acpi_init()
506 		pr_info("Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");  in pci_acpi_init()