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#include <linux/acpi.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <asm/pci_x86.h>
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struct pci_root_info {
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struct acpi_device *bridge;
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static bool pci_use_crs = true;
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static int __init set_use_crs(const struct dmi_system_id *id)
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static const struct dmi_system_id pci_use_crs_table[] __initconst = {
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/* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
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.callback = set_use_crs,
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.ident = "IBM System x3800",
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DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
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DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
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/* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
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/* 2006 AMD HT/VIA system with two host bridges */
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.callback = set_use_crs,
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.ident = "ASRock ALiveSATA2-GLAN",
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DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
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/* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
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/* 2006 AMD HT/VIA system with two host bridges */
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.callback = set_use_crs,
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.ident = "ASUS M2V-MX SE",
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DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
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DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
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DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
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void __init pci_acpi_crs_quirks(void)
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if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
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dmi_check_system(pci_use_crs_table);
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* If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
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* takes precedence over anything we figured out above.
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if (pci_probe & PCI_ROOT_NO_CRS)
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else if (pci_probe & PCI_USE__CRS)
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printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
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"if necessary, use \"pci=%s\" and report a bug\n",
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pci_use_crs ? "Using" : "Ignoring",
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pci_use_crs ? "nocrs" : "use_crs");
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resource_to_addr(struct acpi_resource *resource,
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struct acpi_resource_address64 *addr)
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struct acpi_resource_memory24 *memory24;
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struct acpi_resource_memory32 *memory32;
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struct acpi_resource_fixed_memory32 *fixed_memory32;
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memset(addr, 0, sizeof(*addr));
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switch (resource->type) {
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case ACPI_RESOURCE_TYPE_MEMORY24:
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memory24 = &resource->data.memory24;
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addr->resource_type = ACPI_MEMORY_RANGE;
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addr->minimum = memory24->minimum;
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addr->address_length = memory24->address_length;
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addr->maximum = addr->minimum + addr->address_length - 1;
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case ACPI_RESOURCE_TYPE_MEMORY32:
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memory32 = &resource->data.memory32;
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addr->resource_type = ACPI_MEMORY_RANGE;
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addr->minimum = memory32->minimum;
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addr->address_length = memory32->address_length;
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addr->maximum = addr->minimum + addr->address_length - 1;
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case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
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fixed_memory32 = &resource->data.fixed_memory32;
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addr->resource_type = ACPI_MEMORY_RANGE;
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addr->minimum = fixed_memory32->address;
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addr->address_length = fixed_memory32->address_length;
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addr->maximum = addr->minimum + addr->address_length - 1;
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case ACPI_RESOURCE_TYPE_ADDRESS16:
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case ACPI_RESOURCE_TYPE_ADDRESS32:
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case ACPI_RESOURCE_TYPE_ADDRESS64:
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status = acpi_resource_to_address64(resource, addr);
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if (ACPI_SUCCESS(status) &&
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(addr->resource_type == ACPI_MEMORY_RANGE ||
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addr->resource_type == ACPI_IO_RANGE) &&
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addr->address_length > 0) {
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count_resource(struct acpi_resource *acpi_res, void *data)
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struct pci_root_info *info = data;
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struct acpi_resource_address64 addr;
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status = resource_to_addr(acpi_res, &addr);
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if (ACPI_SUCCESS(status))
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setup_resource(struct acpi_resource *acpi_res, void *data)
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struct pci_root_info *info = data;
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struct resource *res;
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struct acpi_resource_address64 addr;
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status = resource_to_addr(acpi_res, &addr);
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if (!ACPI_SUCCESS(status))
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if (addr.resource_type == ACPI_MEMORY_RANGE) {
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flags = IORESOURCE_MEM;
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if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
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flags |= IORESOURCE_PREFETCH;
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} else if (addr.resource_type == ACPI_IO_RANGE) {
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flags = IORESOURCE_IO;
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start = addr.minimum + addr.translation_offset;
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end = addr.maximum + addr.translation_offset;
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res = &info->res[info->res_num];
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res->name = info->name;
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dev_printk(KERN_DEBUG, &info->bridge->dev,
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"host bridge window %pR (ignored)\n", res);
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if (addr.translation_offset)
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dev_info(&info->bridge->dev, "host bridge window %pR "
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"(PCI address [%#llx-%#llx])\n",
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res, res->start - addr.translation_offset,
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res->end - addr.translation_offset);
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dev_info(&info->bridge->dev, "host bridge window %pR\n", res);
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static bool resource_contains(struct resource *res, resource_size_t point)
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if (res->start <= point && point <= res->end)
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static void coalesce_windows(struct pci_root_info *info, unsigned long type)
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struct resource *res1, *res2;
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for (i = 0; i < info->res_num; i++) {
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res1 = &info->res[i];
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if (!(res1->flags & type))
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for (j = i + 1; j < info->res_num; j++) {
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res2 = &info->res[j];
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if (!(res2->flags & type))
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* I don't like throwing away windows because then
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* our resources no longer match the ACPI _CRS, but
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* the kernel resource tree doesn't allow overlaps.
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if (resource_contains(res1, res2->start) ||
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resource_contains(res1, res2->end) ||
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resource_contains(res2, res1->start) ||
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resource_contains(res2, res1->end)) {
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res1->start = min(res1->start, res2->start);
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res1->end = max(res1->end, res2->end);
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dev_info(&info->bridge->dev,
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"host bridge window expanded to %pR; %pR ignored\n",
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static void add_resources(struct pci_root_info *info)
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struct resource *res, *root, *conflict;
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coalesce_windows(info, IORESOURCE_MEM);
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coalesce_windows(info, IORESOURCE_IO);
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for (i = 0; i < info->res_num; i++) {
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if (res->flags & IORESOURCE_MEM)
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root = &iomem_resource;
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else if (res->flags & IORESOURCE_IO)
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root = &ioport_resource;
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conflict = insert_resource_conflict(root, res);
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dev_info(&info->bridge->dev,
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"ignoring host bridge window %pR (conflicts with %s %pR)\n",
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res, conflict->name, conflict);
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pci_bus_add_resource(info->bus, res, 0);
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get_current_resources(struct acpi_device *device, int busnum,
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int domain, struct pci_bus *bus)
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struct pci_root_info info;
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pci_bus_remove_resources(bus);
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info.bridge = device;
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acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
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size = sizeof(*info.res) * info.res_num;
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info.res = kmalloc(size, GFP_KERNEL);
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info.name = kasprintf(GFP_KERNEL, "PCI Bus %04x:%02x", domain, busnum);
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goto name_alloc_fail;
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acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
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add_resources(&info);
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struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
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struct acpi_device *device = root->device;
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int domain = root->segment;
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int busnum = root->secondary.start;
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struct pci_sysdata *sd;
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#ifdef CONFIG_ACPI_NUMA
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if (domain && !pci_domains_supported) {
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printk(KERN_WARNING "pci_bus %04x:%02x: "
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"ignored (multiple domains not supported)\n",
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#ifdef CONFIG_ACPI_NUMA
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pxm = acpi_get_pxm(device->handle);
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node = pxm_to_node(pxm);
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set_mp_bus_to_node(busnum, node);
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node = get_mp_bus_to_node(busnum);
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if (node != -1 && !node_online(node))
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/* Allocate per-root-bus (not per bus) arch-specific data.
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* TODO: leak; this memory is never freed.
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* It's arguable whether it's worth the trouble to care.
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sd = kzalloc(sizeof(*sd), GFP_KERNEL);
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printk(KERN_WARNING "pci_bus %04x:%02x: "
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"ignored (out of memory)\n", domain, busnum);
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* Maybe the desired pci bus has been already scanned. In such case
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* it is unnecessary to scan the pci bus with the given domain,busnum.
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bus = pci_find_bus(domain, busnum);
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* If the desired bus exits, the content of bus->sysdata will
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memcpy(bus->sysdata, sd, sizeof(*sd));
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bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
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get_current_resources(device, busnum, domain, bus);
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bus->subordinate = pci_scan_child_bus(bus);
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/* After the PCI-E bus has been walked and all devices discovered,
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* configure any settings of the fabric that might be necessary.
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struct pci_bus *child;
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list_for_each_entry(child, &bus->children, node) {
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struct pci_dev *self = child->self;
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pcie_bus_configure_settings(child, self->pcie_mpss);
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if (bus && node != -1) {
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#ifdef CONFIG_ACPI_NUMA
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dev_printk(KERN_DEBUG, &bus->dev,
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"on NUMA node %d (pxm %d)\n", node, pxm);
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dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
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int __init pci_acpi_init(void)
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struct pci_dev *dev = NULL;
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printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
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acpi_irq_penalty_init();
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pcibios_enable_irq = acpi_pci_irq_enable;
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pcibios_disable_irq = acpi_pci_irq_disable;
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x86_init.pci.init_irq = x86_init_noop;
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* PCI IRQ routing is set up by pci_enable_device(), but we
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* also do it here in case there are still broken drivers that
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* don't use pci_enable_device().
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printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
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for_each_pci_dev(dev)
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acpi_pci_irq_enable(dev);