1 // SPDX-License-Identifier: GPL-2.0-only
3  *	Low-Level PCI Support for PC
5  *	(c) 1999--2000 Martin Mares <mj@ucw.cz>
9 #include <linux/pci.h>
10 #include <linux/pci-acpi.h>
35 int pcibios_last_bus = -1;
40 int raw_pci_read(unsigned int domain, unsigned int bus, unsigned int devfn,  in raw_pci_read()  argument
43 	if (domain == 0 && reg < 256 && raw_pci_ops)  in raw_pci_read()
44 		return raw_pci_ops->read(domain, bus, devfn, reg, len, val);  in raw_pci_read()
46 		return raw_pci_ext_ops->read(domain, bus, devfn, reg, len, val);  in raw_pci_read()
47 	return -EINVAL;  in raw_pci_read()
50 int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,  in raw_pci_write()  argument
53 	if (domain == 0 && reg < 256 && raw_pci_ops)  in raw_pci_write()
54 		return raw_pci_ops->write(domain, bus, devfn, reg, len, val);  in raw_pci_write()
56 		return raw_pci_ext_ops->write(domain, bus, devfn, reg, len, val);  in raw_pci_write()
57 	return -EINVAL;  in raw_pci_write()
62 	return raw_pci_read(pci_domain_nr(bus), bus->number,  in pci_read()
68 	return raw_pci_write(pci_domain_nr(bus), bus->number,  in pci_write()
78  * This interrupt-safe spinlock protects all accesses to PCI configuration
86 	printk(KERN_INFO "PCI: %s detected, can skip ISA alignment\n", d->ident);  in can_skip_ioresource_align()
92  * Systems where PCI IO resource ISA alignment can be skipped
129 	struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];  in pcibios_fixup_device_resources()
140 			bar_r = &dev->resource[bar];  in pcibios_fixup_device_resources()
141 			if (bar_r->start == 0 && bar_r->end != 0) {  in pcibios_fixup_device_resources()
142 				bar_r->flags = 0;  in pcibios_fixup_device_resources()
143 				bar_r->end = 0;  in pcibios_fixup_device_resources()
149 		if (rom_r->parent)  in pcibios_fixup_device_resources()
151 		if (rom_r->start) {  in pcibios_fixup_device_resources()
155 		rom_r->start = rom_r->end = rom_r->flags = 0;  in pcibios_fixup_device_resources()
169 	list_for_each_entry(dev, &b->devices, bus_list)  in pcibios_fixup_bus()
192 		printk(KERN_INFO "PCI: %s detected, enabling pci=bfsort.\n", d->ident);  in set_bf_sort()
202 	if (dm->type != 0xB1)  in read_dmi_type_b1()
215  * Enable renumbering of PCI bus# ranges to reach all PCI busses (Cardbus)
221 	printk(KERN_INFO "%s detected: enabling PCI bus# renumbering"  in assign_all_busses()
222 			" (pci=assign-busses)\n", d->ident);  in assign_all_busses()
229 	printk(KERN_INFO "PCI: %s detected, enabling pci=pcie_scan_all\n",  in set_scan_all()
230 	       d->ident);  in set_scan_all()
238  * Laptops which need pci=assign-busses to see Cardbus cards
466 		printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busnum);  in pcibios_scan_root()
469 	sd->node = x86_pci_root_bus_node(busnum);  in pcibios_scan_root()
471 	printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);  in pcibios_scan_root()
486 	 * Set PCI cacheline size to that of the CPU if the CPU has reported it.  in pcibios_set_cache_line_size()
489 	 * as quite a few PCI devices do not support smaller values.  in pcibios_set_cache_line_size()
491 	if (c->x86_clflush_size > 0) {  in pcibios_set_cache_line_size()
492 		pci_dfl_cache_line_size = c->x86_clflush_size >> 2;  in pcibios_set_cache_line_size()
493 		printk(KERN_DEBUG "PCI: pci_cache_line_size set to %d bytes\n",  in pcibios_set_cache_line_size()
497 		printk(KERN_DEBUG "PCI: Unknown cacheline size. Setting to 32 bytes\n");  in pcibios_set_cache_line_size()
504 		printk(KERN_WARNING "PCI: System does not support PCI\n");  in pcibios_init()
589 	} else if (!strcmp(str, "assign-busses")) {  in pcibios_setup()
621 		if (noioapicreroute != -1)  in pcibios_setup()
625 		if (noioapicreroute != -1)  in pcibios_setup()
639 	if (is_vmd(pdev->bus))  in set_dev_domain_options()
640 		pdev->hotplug_user_indicators = 1;  in set_dev_domain_options()
654 			return -ENOMEM;  in pcibios_device_add()
656 		if (data->type == SETUP_PCI) {  in pcibios_device_add()
659 			if ((pci_domain_nr(dev->bus) == rom->segment) &&  in pcibios_device_add()
660 			    (dev->bus->number == rom->bus) &&  in pcibios_device_add()
661 			    (PCI_SLOT(dev->devfn) == rom->device) &&  in pcibios_device_add()
662 			    (PCI_FUNC(dev->devfn) == rom->function) &&  in pcibios_device_add()
663 			    (dev->vendor == rom->vendor) &&  in pcibios_device_add()
664 			    (dev->device == rom->devid)) {  in pcibios_device_add()
665 				dev->rom = pa_data +  in pcibios_device_add()
667 				dev->romlen = rom->pcilen;  in pcibios_device_add()
670 		pa_data = data->next;  in pcibios_device_add()
676 	 * Setup the initial MSI domain of the device. If the underlying  in pcibios_device_add()
677 	 * bus has a PCI/MSI irqdomain associated use the bus domain,  in pcibios_device_add()
678 	 * otherwise set the default domain. This ensures that special irq  in pcibios_device_add()
681 	 * active it will overwrite the domain pointer when the device is  in pcibios_device_add()
682 	 * associated to a remapping domain.  in pcibios_device_add()
684 	msidom = dev_get_msi_domain(&dev->bus->dev);  in pcibios_device_add()
687 	dev_set_msi_domain(&dev->dev, msidom);  in pcibios_device_add()
712 	if (atomic_dec_return(&dev->enable_cnt) >= 0)  in pcibios_release_device()
729 	if (is_vmd(dev->bus))  in pci_real_dma_dev()
730 		return to_pci_sysdata(dev->bus)->vmd_dev;  in pci_real_dma_dev()