/arch/x86/pci/acpi.c
C | 340 lines | 274 code | 42 blank | 24 comment | 45 complexity | 535eb0ccca1cbc8ce48a0e9b435060fa MD5 | raw file
- #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 <asm/numa.h>
- #include <asm/pci_x86.h>
- struct pci_root_info {
- struct acpi_device *bridge;
- char *name;
- unsigned int res_num;
- struct resource *res;
- struct pci_bus *bus;
- int busnum;
- };
- static bool pci_use_crs = true;
- static int __init set_use_crs(const struct dmi_system_id *id)
- {
- pci_use_crs = true;
- return 0;
- }
- static const struct dmi_system_id pci_use_crs_table[] __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"),
- },
- },
- {}
- };
- void __init pci_acpi_crs_quirks(void)
- {
- int year;
- if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
- pci_use_crs = false;
- dmi_check_system(pci_use_crs_table);
- /*
- * 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");
- }
- static acpi_status
- resource_to_addr(struct acpi_resource *resource,
- struct acpi_resource_address64 *addr)
- {
- acpi_status status;
- struct acpi_resource_memory24 *memory24;
- struct acpi_resource_memory32 *memory32;
- struct acpi_resource_fixed_memory32 *fixed_memory32;
- memset(addr, 0, sizeof(*addr));
- switch (resource->type) {
- case ACPI_RESOURCE_TYPE_MEMORY24:
- memory24 = &resource->data.memory24;
- addr->resource_type = ACPI_MEMORY_RANGE;
- addr->minimum = memory24->minimum;
- addr->address_length = memory24->address_length;
- addr->maximum = addr->minimum + addr->address_length - 1;
- return AE_OK;
- case ACPI_RESOURCE_TYPE_MEMORY32:
- memory32 = &resource->data.memory32;
- addr->resource_type = ACPI_MEMORY_RANGE;
- addr->minimum = memory32->minimum;
- addr->address_length = memory32->address_length;
- addr->maximum = addr->minimum + addr->address_length - 1;
- return AE_OK;
- case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
- fixed_memory32 = &resource->data.fixed_memory32;
- addr->resource_type = ACPI_MEMORY_RANGE;
- addr->minimum = fixed_memory32->address;
- addr->address_length = fixed_memory32->address_length;
- addr->maximum = addr->minimum + addr->address_length - 1;
- return AE_OK;
- case ACPI_RESOURCE_TYPE_ADDRESS16:
- case ACPI_RESOURCE_TYPE_ADDRESS32:
- case ACPI_RESOURCE_TYPE_ADDRESS64:
- status = acpi_resource_to_address64(resource, addr);
- if (ACPI_SUCCESS(status) &&
- (addr->resource_type == ACPI_MEMORY_RANGE ||
- addr->resource_type == ACPI_IO_RANGE) &&
- addr->address_length > 0) {
- return AE_OK;
- }
- break;
- }
- return AE_ERROR;
- }
- static acpi_status
- count_resource(struct acpi_resource *acpi_res, void *data)
- {
- struct pci_root_info *info = data;
- struct acpi_resource_address64 addr;
- acpi_status status;
- status = resource_to_addr(acpi_res, &addr);
- if (ACPI_SUCCESS(status))
- info->res_num++;
- return AE_OK;
- }
- static acpi_status
- setup_resource(struct acpi_resource *acpi_res, void *data)
- {
- struct pci_root_info *info = data;
- struct resource *res;
- struct acpi_resource_address64 addr;
- acpi_status status;
- unsigned long flags;
- struct resource *root, *conflict;
- u64 start, end;
- status = resource_to_addr(acpi_res, &addr);
- if (!ACPI_SUCCESS(status))
- return AE_OK;
- if (addr.resource_type == ACPI_MEMORY_RANGE) {
- root = &iomem_resource;
- flags = IORESOURCE_MEM;
- if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
- flags |= IORESOURCE_PREFETCH;
- } else if (addr.resource_type == ACPI_IO_RANGE) {
- root = &ioport_resource;
- flags = IORESOURCE_IO;
- } else
- return AE_OK;
- start = addr.minimum + addr.translation_offset;
- end = addr.maximum + addr.translation_offset;
- res = &info->res[info->res_num];
- res->name = info->name;
- res->flags = flags;
- res->start = start;
- res->end = end;
- res->child = NULL;
- if (!pci_use_crs) {
- dev_printk(KERN_DEBUG, &info->bridge->dev,
- "host bridge window %pR (ignored)\n", res);
- return AE_OK;
- }
- conflict = insert_resource_conflict(root, res);
- if (conflict) {
- dev_err(&info->bridge->dev,
- "address space collision: host bridge window %pR "
- "conflicts with %s %pR\n",
- res, conflict->name, conflict);
- } else {
- pci_bus_add_resource(info->bus, res, 0);
- info->res_num++;
- if (addr.translation_offset)
- dev_info(&info->bridge->dev, "host bridge window %pR "
- "(PCI address [%#llx-%#llx])\n",
- res, res->start - addr.translation_offset,
- res->end - addr.translation_offset);
- else
- dev_info(&info->bridge->dev,
- "host bridge window %pR\n", res);
- }
- return AE_OK;
- }
- static void
- get_current_resources(struct acpi_device *device, int busnum,
- int domain, struct pci_bus *bus)
- {
- struct pci_root_info info;
- size_t size;
- if (pci_use_crs)
- pci_bus_remove_resources(bus);
- info.bridge = device;
- info.bus = bus;
- info.res_num = 0;
- acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
- &info);
- if (!info.res_num)
- return;
- size = sizeof(*info.res) * info.res_num;
- info.res = kmalloc(size, GFP_KERNEL);
- if (!info.res)
- goto res_alloc_fail;
- info.name = kmalloc(16, GFP_KERNEL);
- if (!info.name)
- goto name_alloc_fail;
- sprintf(info.name, "PCI Bus %04x:%02x", domain, busnum);
- info.res_num = 0;
- acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
- &info);
- return;
- name_alloc_fail:
- kfree(info.res);
- res_alloc_fail:
- return;
- }
- struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
- {
- struct pci_bus *bus;
- struct pci_sysdata *sd;
- int node;
- #ifdef CONFIG_ACPI_NUMA
- int pxm;
- #endif
- if (domain && !pci_domains_supported) {
- printk(KERN_WARNING "pci_bus %04x:%02x: "
- "ignored (multiple domains not supported)\n",
- domain, busnum);
- return NULL;
- }
- node = -1;
- #ifdef CONFIG_ACPI_NUMA
- pxm = acpi_get_pxm(device->handle);
- if (pxm >= 0)
- node = pxm_to_node(pxm);
- if (node != -1)
- set_mp_bus_to_node(busnum, node);
- else
- #endif
- node = get_mp_bus_to_node(busnum);
- if (node != -1 && !node_online(node))
- node = -1;
- /* Allocate per-root-bus (not per bus) arch-specific data.
- * TODO: leak; this memory is never freed.
- * It's arguable whether it's worth the trouble to care.
- */
- sd = kzalloc(sizeof(*sd), GFP_KERNEL);
- if (!sd) {
- printk(KERN_WARNING "pci_bus %04x:%02x: "
- "ignored (out of memory)\n", domain, busnum);
- return NULL;
- }
- sd->domain = domain;
- sd->node = node;
- /*
- * Maybe the desired pci bus has been already scanned. In such case
- * it is unnecessary to scan the pci bus with the given domain,busnum.
- */
- bus = pci_find_bus(domain, busnum);
- if (bus) {
- /*
- * If the desired bus exits, the content of bus->sysdata will
- * be replaced by sd.
- */
- memcpy(bus->sysdata, sd, sizeof(*sd));
- kfree(sd);
- } else {
- bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
- if (bus) {
- get_current_resources(device, busnum, domain, bus);
- bus->subordinate = pci_scan_child_bus(bus);
- }
- }
- if (!bus)
- kfree(sd);
- if (bus && node != -1) {
- #ifdef CONFIG_ACPI_NUMA
- if (pxm >= 0)
- dev_printk(KERN_DEBUG, &bus->dev,
- "on NUMA node %d (pxm %d)\n", node, pxm);
- #else
- dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
- #endif
- }
- return bus;
- }
- 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;
- }