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425 lines
11 KiB
425 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/pci.h> |
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#include <linux/acpi.h> |
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#include <linux/init.h> |
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#include <linux/irq.h> |
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#include <linux/dmi.h> |
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#include <linux/slab.h> |
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#include <linux/pci-acpi.h> |
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#include <asm/numa.h> |
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#include <asm/pci_x86.h> |
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struct pci_root_info { |
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struct acpi_pci_root_info common; |
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struct pci_sysdata sd; |
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#ifdef CONFIG_PCI_MMCONFIG |
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bool mcfg_added; |
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u8 start_bus; |
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u8 end_bus; |
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#endif |
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}; |
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static bool pci_use_crs = true; |
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static bool pci_ignore_seg = false; |
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static int __init set_use_crs(const struct dmi_system_id *id) |
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{ |
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pci_use_crs = true; |
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return 0; |
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} |
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static int __init set_nouse_crs(const struct dmi_system_id *id) |
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{ |
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pci_use_crs = false; |
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return 0; |
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} |
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static int __init set_ignore_seg(const struct dmi_system_id *id) |
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{ |
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printk(KERN_INFO "PCI: %s detected: ignoring ACPI _SEG\n", id->ident); |
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pci_ignore_seg = true; |
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return 0; |
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} |
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static const struct dmi_system_id pci_crs_quirks[] __initconst = { |
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/* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */ |
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{ |
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.callback = set_use_crs, |
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.ident = "IBM System x3800", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "IBM"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "x3800"), |
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}, |
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}, |
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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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{ |
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.callback = set_use_crs, |
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.ident = "ASRock ALiveSATA2-GLAN", |
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.matches = { |
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DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"), |
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}, |
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}, |
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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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{ |
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.callback = set_use_crs, |
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.ident = "ASUS M2V-MX SE", |
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.matches = { |
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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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}, |
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}, |
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/* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */ |
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{ |
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.callback = set_use_crs, |
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.ident = "MSI MS-7253", |
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.matches = { |
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DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"), |
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DMI_MATCH(DMI_BOARD_NAME, "MS-7253"), |
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DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"), |
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}, |
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}, |
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/* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/931368 */ |
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/* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1033299 */ |
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{ |
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.callback = set_use_crs, |
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.ident = "Foxconn K8M890-8237A", |
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.matches = { |
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DMI_MATCH(DMI_BOARD_VENDOR, "Foxconn"), |
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DMI_MATCH(DMI_BOARD_NAME, "K8M890-8237A"), |
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DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"), |
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}, |
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}, |
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/* Now for the blacklist.. */ |
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/* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */ |
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{ |
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.callback = set_nouse_crs, |
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.ident = "Dell Studio 1557", |
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.matches = { |
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DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."), |
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DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"), |
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DMI_MATCH(DMI_BIOS_VERSION, "A09"), |
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}, |
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}, |
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/* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */ |
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{ |
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.callback = set_nouse_crs, |
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.ident = "Thinkpad SL510", |
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.matches = { |
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DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"), |
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DMI_MATCH(DMI_BOARD_NAME, "2847DFG"), |
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DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"), |
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}, |
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}, |
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/* https://bugzilla.kernel.org/show_bug.cgi?id=42606 */ |
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{ |
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.callback = set_nouse_crs, |
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.ident = "Supermicro X8DTH", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "X8DTH-i/6/iF/6F"), |
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DMI_MATCH(DMI_BIOS_VERSION, "2.0a"), |
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}, |
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}, |
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/* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */ |
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{ |
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.callback = set_ignore_seg, |
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.ident = "HP xw9300", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"), |
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}, |
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}, |
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{} |
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}; |
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void __init pci_acpi_crs_quirks(void) |
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{ |
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int year = dmi_get_bios_year(); |
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if (year >= 0 && year < 2008 && iomem_resource.end <= 0xffffffff) |
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pci_use_crs = false; |
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dmi_check_system(pci_crs_quirks); |
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/* |
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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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*/ |
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if (pci_probe & PCI_ROOT_NO_CRS) |
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pci_use_crs = false; |
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else if (pci_probe & PCI_USE__CRS) |
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pci_use_crs = true; |
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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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} |
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#ifdef CONFIG_PCI_MMCONFIG |
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static int check_segment(u16 seg, struct device *dev, char *estr) |
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{ |
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if (seg) { |
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dev_err(dev, |
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"%s can't access PCI configuration " |
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"space under this host bridge.\n", |
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estr); |
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return -EIO; |
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} |
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/* |
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* Failure in adding MMCFG information is not fatal, |
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* just can't access extended configuration space of |
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* devices under this host bridge. |
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*/ |
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dev_warn(dev, |
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"%s can't access extended PCI configuration " |
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"space under this bridge.\n", |
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estr); |
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return 0; |
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} |
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static int setup_mcfg_map(struct acpi_pci_root_info *ci) |
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{ |
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int result, seg; |
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struct pci_root_info *info; |
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struct acpi_pci_root *root = ci->root; |
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struct device *dev = &ci->bridge->dev; |
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info = container_of(ci, struct pci_root_info, common); |
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info->start_bus = (u8)root->secondary.start; |
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info->end_bus = (u8)root->secondary.end; |
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info->mcfg_added = false; |
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seg = info->sd.domain; |
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/* return success if MMCFG is not in use */ |
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if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg) |
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return 0; |
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if (!(pci_probe & PCI_PROBE_MMCONF)) |
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return check_segment(seg, dev, "MMCONFIG is disabled,"); |
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result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus, |
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root->mcfg_addr); |
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if (result == 0) { |
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/* enable MMCFG if it hasn't been enabled yet */ |
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if (raw_pci_ext_ops == NULL) |
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raw_pci_ext_ops = &pci_mmcfg; |
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info->mcfg_added = true; |
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} else if (result != -EEXIST) |
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return check_segment(seg, dev, |
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"fail to add MMCONFIG information,"); |
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return 0; |
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} |
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static void teardown_mcfg_map(struct acpi_pci_root_info *ci) |
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{ |
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struct pci_root_info *info; |
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info = container_of(ci, struct pci_root_info, common); |
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if (info->mcfg_added) { |
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pci_mmconfig_delete(info->sd.domain, |
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info->start_bus, info->end_bus); |
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info->mcfg_added = false; |
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} |
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} |
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#else |
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static int setup_mcfg_map(struct acpi_pci_root_info *ci) |
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{ |
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return 0; |
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} |
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static void teardown_mcfg_map(struct acpi_pci_root_info *ci) |
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{ |
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} |
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#endif |
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static int pci_acpi_root_get_node(struct acpi_pci_root *root) |
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{ |
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int busnum = root->secondary.start; |
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struct acpi_device *device = root->device; |
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int node = acpi_get_node(device->handle); |
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if (node == NUMA_NO_NODE) { |
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node = x86_pci_root_bus_node(busnum); |
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if (node != 0 && node != NUMA_NO_NODE) |
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dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n", |
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node); |
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} |
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if (node != NUMA_NO_NODE && !node_online(node)) |
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node = NUMA_NO_NODE; |
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return node; |
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} |
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static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci) |
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{ |
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return setup_mcfg_map(ci); |
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} |
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static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci) |
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{ |
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teardown_mcfg_map(ci); |
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kfree(container_of(ci, struct pci_root_info, common)); |
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} |
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/* |
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* An IO port or MMIO resource assigned to a PCI host bridge may be |
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* consumed by the host bridge itself or available to its child |
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* bus/devices. The ACPI specification defines a bit (Producer/Consumer) |
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* to tell whether the resource is consumed by the host bridge itself, |
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* but firmware hasn't used that bit consistently, so we can't rely on it. |
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* |
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* On x86 and IA64 platforms, all IO port and MMIO resources are assumed |
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* to be available to child bus/devices except one special case: |
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* IO port [0xCF8-0xCFF] is consumed by the host bridge itself |
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* to access PCI configuration space. |
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* |
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* So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF]. |
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*/ |
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static bool resource_is_pcicfg_ioport(struct resource *res) |
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{ |
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return (res->flags & IORESOURCE_IO) && |
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res->start == 0xCF8 && res->end == 0xCFF; |
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} |
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static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci) |
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{ |
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struct acpi_device *device = ci->bridge; |
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int busnum = ci->root->secondary.start; |
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struct resource_entry *entry, *tmp; |
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int status; |
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status = acpi_pci_probe_root_resources(ci); |
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if (pci_use_crs) { |
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resource_list_for_each_entry_safe(entry, tmp, &ci->resources) |
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if (resource_is_pcicfg_ioport(entry->res)) |
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resource_list_destroy_entry(entry); |
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return status; |
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} |
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resource_list_for_each_entry_safe(entry, tmp, &ci->resources) { |
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dev_printk(KERN_DEBUG, &device->dev, |
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"host bridge window %pR (ignored)\n", entry->res); |
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resource_list_destroy_entry(entry); |
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} |
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x86_pci_root_bus_resources(busnum, &ci->resources); |
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return 0; |
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} |
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static struct acpi_pci_root_ops acpi_pci_root_ops = { |
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.pci_ops = &pci_root_ops, |
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.init_info = pci_acpi_root_init_info, |
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.release_info = pci_acpi_root_release_info, |
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.prepare_resources = pci_acpi_root_prepare_resources, |
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}; |
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struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) |
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{ |
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int domain = root->segment; |
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int busnum = root->secondary.start; |
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int node = pci_acpi_root_get_node(root); |
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struct pci_bus *bus; |
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if (pci_ignore_seg) |
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root->segment = domain = 0; |
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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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domain, busnum); |
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return NULL; |
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} |
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bus = pci_find_bus(domain, busnum); |
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if (bus) { |
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/* |
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* If the desired bus has been scanned already, replace |
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* its bus->sysdata. |
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*/ |
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struct pci_sysdata sd = { |
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.domain = domain, |
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.node = node, |
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.companion = root->device |
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}; |
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memcpy(bus->sysdata, &sd, sizeof(sd)); |
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} else { |
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struct pci_root_info *info; |
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info = kzalloc(sizeof(*info), GFP_KERNEL); |
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if (!info) |
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dev_err(&root->device->dev, |
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"pci_bus %04x:%02x: ignored (out of memory)\n", |
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domain, busnum); |
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else { |
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info->sd.domain = domain; |
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info->sd.node = node; |
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info->sd.companion = root->device; |
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bus = acpi_pci_root_create(root, &acpi_pci_root_ops, |
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&info->common, &info->sd); |
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} |
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} |
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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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*/ |
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if (bus) { |
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struct pci_bus *child; |
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list_for_each_entry(child, &bus->children, node) |
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pcie_bus_configure_settings(child); |
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} |
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return bus; |
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} |
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int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) |
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{ |
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/* |
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* We pass NULL as parent to pci_create_root_bus(), so if it is not NULL |
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* here, pci_create_root_bus() has been called by someone else and |
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* sysdata is likely to be different from what we expect. Let it go in |
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* that case. |
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*/ |
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if (!bridge->dev.parent) { |
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struct pci_sysdata *sd = bridge->bus->sysdata; |
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ACPI_COMPANION_SET(&bridge->dev, sd->companion); |
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} |
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return 0; |
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} |
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int __init pci_acpi_init(void) |
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{ |
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struct pci_dev *dev = NULL; |
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if (acpi_noirq) |
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return -ENODEV; |
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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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if (pci_routeirq) { |
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/* |
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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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*/ |
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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); |
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} |
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return 0; |
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}
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