diff options
Diffstat (limited to 'arch/x86/pci/acpi.c')
| -rw-r--r-- | arch/x86/pci/acpi.c | 425 |
1 files changed, 425 insertions, 0 deletions
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c new file mode 100644 index 000000000..5559dcadd --- /dev/null +++ b/arch/x86/pci/acpi.c @@ -0,0 +1,425 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/pci.h> +#include <linux/acpi.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/dmi.h> +#include <linux/slab.h> +#include <linux/pci-acpi.h> +#include <asm/numa.h> +#include <asm/pci_x86.h> + +struct pci_root_info { + struct acpi_pci_root_info common; + struct pci_sysdata sd; +#ifdef CONFIG_PCI_MMCONFIG + bool mcfg_added; + u8 start_bus; + u8 end_bus; +#endif +}; + +static bool pci_use_crs = true; +static bool pci_ignore_seg = false; + +static int __init set_use_crs(const struct dmi_system_id *id) +{ + pci_use_crs = true; + return 0; +} + +static int __init set_nouse_crs(const struct dmi_system_id *id) +{ + pci_use_crs = false; + return 0; +} + +static int __init set_ignore_seg(const struct dmi_system_id *id) +{ + printk(KERN_INFO "PCI: %s detected: ignoring ACPI _SEG\n", id->ident); + pci_ignore_seg = true; + return 0; +} + +static const struct dmi_system_id pci_crs_quirks[] __initconst = { + /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */ + { + .callback = set_use_crs, + .ident = "IBM System x3800", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "IBM"), + DMI_MATCH(DMI_PRODUCT_NAME, "x3800"), + }, + }, + /* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */ + /* 2006 AMD HT/VIA system with two host bridges */ + { + .callback = set_use_crs, + .ident = "ASRock ALiveSATA2-GLAN", + .matches = { + DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"), + }, + }, + /* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */ + /* 2006 AMD HT/VIA system with two host bridges */ + { + .callback = set_use_crs, + .ident = "ASUS M2V-MX SE", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), + DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"), + DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), + }, + }, + /* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */ + { + .callback = set_use_crs, + .ident = "MSI MS-7253", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"), + DMI_MATCH(DMI_BOARD_NAME, "MS-7253"), + DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"), + }, + }, + /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/931368 */ + /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1033299 */ + { + .callback = set_use_crs, + .ident = "Foxconn K8M890-8237A", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "Foxconn"), + DMI_MATCH(DMI_BOARD_NAME, "K8M890-8237A"), + DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"), + }, + }, + + /* Now for the blacklist.. */ + + /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */ + { + .callback = set_nouse_crs, + .ident = "Dell Studio 1557", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"), + DMI_MATCH(DMI_BIOS_VERSION, "A09"), + }, + }, + /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */ + { + .callback = set_nouse_crs, + .ident = "Thinkpad SL510", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"), + DMI_MATCH(DMI_BOARD_NAME, "2847DFG"), + DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"), + }, + }, + /* https://bugzilla.kernel.org/show_bug.cgi?id=42606 */ + { + .callback = set_nouse_crs, + .ident = "Supermicro X8DTH", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"), + DMI_MATCH(DMI_PRODUCT_NAME, "X8DTH-i/6/iF/6F"), + DMI_MATCH(DMI_BIOS_VERSION, "2.0a"), + }, + }, + + /* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */ + { + .callback = set_ignore_seg, + .ident = "HP xw9300", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"), + }, + }, + {} +}; + +void __init pci_acpi_crs_quirks(void) +{ + int year = dmi_get_bios_year(); + + if (year >= 0 && year < 2008 && iomem_resource.end <= 0xffffffff) + pci_use_crs = false; + + dmi_check_system(pci_crs_quirks); + + /* + * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that + * takes precedence over anything we figured out above. + */ + if (pci_probe & PCI_ROOT_NO_CRS) + pci_use_crs = false; + else if (pci_probe & PCI_USE__CRS) + pci_use_crs = true; + + printk(KERN_INFO "PCI: %s host bridge windows from ACPI; " + "if necessary, use \"pci=%s\" and report a bug\n", + pci_use_crs ? "Using" : "Ignoring", + pci_use_crs ? "nocrs" : "use_crs"); +} + +#ifdef CONFIG_PCI_MMCONFIG +static int check_segment(u16 seg, struct device *dev, char *estr) +{ + if (seg) { + dev_err(dev, + "%s can't access PCI configuration " + "space under this host bridge.\n", + estr); + return -EIO; + } + + /* + * Failure in adding MMCFG information is not fatal, + * just can't access extended configuration space of + * devices under this host bridge. + */ + dev_warn(dev, + "%s can't access extended PCI configuration " + "space under this bridge.\n", + estr); + + return 0; +} + +static int setup_mcfg_map(struct acpi_pci_root_info *ci) +{ + int result, seg; + struct pci_root_info *info; + struct acpi_pci_root *root = ci->root; + struct device *dev = &ci->bridge->dev; + + info = container_of(ci, struct pci_root_info, common); + info->start_bus = (u8)root->secondary.start; + info->end_bus = (u8)root->secondary.end; + info->mcfg_added = false; + seg = info->sd.domain; + + /* return success if MMCFG is not in use */ + if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg) + return 0; + + if (!(pci_probe & PCI_PROBE_MMCONF)) + return check_segment(seg, dev, "MMCONFIG is disabled,"); + + result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus, + root->mcfg_addr); + if (result == 0) { + /* enable MMCFG if it hasn't been enabled yet */ + if (raw_pci_ext_ops == NULL) + raw_pci_ext_ops = &pci_mmcfg; + info->mcfg_added = true; + } else if (result != -EEXIST) + return check_segment(seg, dev, + "fail to add MMCONFIG information,"); + + return 0; +} + +static void teardown_mcfg_map(struct acpi_pci_root_info *ci) +{ + struct pci_root_info *info; + + info = container_of(ci, struct pci_root_info, common); + if (info->mcfg_added) { + pci_mmconfig_delete(info->sd.domain, + info->start_bus, info->end_bus); + info->mcfg_added = false; + } +} +#else +static int setup_mcfg_map(struct acpi_pci_root_info *ci) +{ + return 0; +} + +static void teardown_mcfg_map(struct acpi_pci_root_info *ci) +{ +} +#endif + +static int pci_acpi_root_get_node(struct acpi_pci_root *root) +{ + int busnum = root->secondary.start; + struct acpi_device *device = root->device; + int node = acpi_get_node(device->handle); + + if (node == NUMA_NO_NODE) { + node = x86_pci_root_bus_node(busnum); + if (node != 0 && node != NUMA_NO_NODE) + dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n", + node); + } + if (node != NUMA_NO_NODE && !node_online(node)) + node = NUMA_NO_NODE; + + return node; +} + +static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci) +{ + return setup_mcfg_map(ci); +} + +static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci) +{ + teardown_mcfg_map(ci); + kfree(container_of(ci, struct pci_root_info, common)); +} + +/* + * An IO port or MMIO resource assigned to a PCI host bridge may be + * consumed by the host bridge itself or available to its child + * bus/devices. The ACPI specification defines a bit (Producer/Consumer) + * to tell whether the resource is consumed by the host bridge itself, + * but firmware hasn't used that bit consistently, so we can't rely on it. + * + * On x86 and IA64 platforms, all IO port and MMIO resources are assumed + * to be available to child bus/devices except one special case: + * IO port [0xCF8-0xCFF] is consumed by the host bridge itself + * to access PCI configuration space. + * + * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF]. + */ +static bool resource_is_pcicfg_ioport(struct resource *res) +{ + return (res->flags & IORESOURCE_IO) && + res->start == 0xCF8 && res->end == 0xCFF; +} + +static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci) +{ + struct acpi_device *device = ci->bridge; + int busnum = ci->root->secondary.start; + struct resource_entry *entry, *tmp; + int status; + + status = acpi_pci_probe_root_resources(ci); + if (pci_use_crs) { + resource_list_for_each_entry_safe(entry, tmp, &ci->resources) + if (resource_is_pcicfg_ioport(entry->res)) + resource_list_destroy_entry(entry); + return status; + } + + resource_list_for_each_entry_safe(entry, tmp, &ci->resources) { + dev_printk(KERN_DEBUG, &device->dev, + "host bridge window %pR (ignored)\n", entry->res); + resource_list_destroy_entry(entry); + } + x86_pci_root_bus_resources(busnum, &ci->resources); + + return 0; +} + +static struct acpi_pci_root_ops acpi_pci_root_ops = { + .pci_ops = &pci_root_ops, + .init_info = pci_acpi_root_init_info, + .release_info = pci_acpi_root_release_info, + .prepare_resources = pci_acpi_root_prepare_resources, +}; + +struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) +{ + int domain = root->segment; + int busnum = root->secondary.start; + int node = pci_acpi_root_get_node(root); + struct pci_bus *bus; + + if (pci_ignore_seg) + root->segment = domain = 0; + + if (domain && !pci_domains_supported) { + printk(KERN_WARNING "pci_bus %04x:%02x: " + "ignored (multiple domains not supported)\n", + domain, busnum); + return NULL; + } + + bus = pci_find_bus(domain, busnum); + if (bus) { + /* + * If the desired bus has been scanned already, replace + * its bus->sysdata. + */ + struct pci_sysdata sd = { + .domain = domain, + .node = node, + .companion = root->device + }; + + memcpy(bus->sysdata, &sd, sizeof(sd)); + } else { + struct pci_root_info *info; + + info = kzalloc_node(sizeof(*info), GFP_KERNEL, node); + if (!info) + dev_err(&root->device->dev, + "pci_bus %04x:%02x: ignored (out of memory)\n", + domain, busnum); + else { + info->sd.domain = domain; + info->sd.node = node; + info->sd.companion = root->device; + bus = acpi_pci_root_create(root, &acpi_pci_root_ops, + &info->common, &info->sd); + } + } + + /* After the PCI-E bus has been walked and all devices discovered, + * configure any settings of the fabric that might be necessary. + */ + if (bus) { + struct pci_bus *child; + list_for_each_entry(child, &bus->children, node) + pcie_bus_configure_settings(child); + } + + return bus; +} + +int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) +{ + /* + * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL + * here, pci_create_root_bus() has been called by someone else and + * sysdata is likely to be different from what we expect. Let it go in + * that case. + */ + if (!bridge->dev.parent) { + struct pci_sysdata *sd = bridge->bus->sysdata; + ACPI_COMPANION_SET(&bridge->dev, sd->companion); + } + return 0; +} + +int __init pci_acpi_init(void) +{ + struct pci_dev *dev = NULL; + + if (acpi_noirq) + return -ENODEV; + + printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n"); + acpi_irq_penalty_init(); + pcibios_enable_irq = acpi_pci_irq_enable; + pcibios_disable_irq = acpi_pci_irq_disable; + x86_init.pci.init_irq = x86_init_noop; + + if (pci_routeirq) { + /* + * PCI IRQ routing is set up by pci_enable_device(), but we + * also do it here in case there are still broken drivers that + * don't use pci_enable_device(). + */ + printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n"); + for_each_pci_dev(dev) + acpi_pci_irq_enable(dev); + } + + return 0; +} |