/* * drivers/pci/bus.c * * From setup-res.c, by: * Dave Rusling (david.rusling@reo.mts.dec.com) * David Mosberger (davidm@cs.arizona.edu) * David Miller (davem@redhat.com) * Ivan Kokshaysky (ink@jurassic.park.msu.ru) */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/pci.h> #include <linux/errno.h> #include <linux/ioport.h> #include <linux/proc_fs.h> #include <linux/init.h> #include <linux/slab.h> #include "pci.h" void pci_bus_add_resource(struct pci_bus *bus, struct resource *res, unsigned int flags) { struct pci_bus_resource *bus_res; bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL); if (!bus_res) { dev_err(&bus->dev, "can't add %pR resource\n", res); return; } bus_res->res = res; bus_res->flags = flags; list_add_tail(&bus_res->list, &bus->resources); } struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n) { struct pci_bus_resource *bus_res; if (n < PCI_BRIDGE_RESOURCE_NUM) return bus->resource[n]; n -= PCI_BRIDGE_RESOURCE_NUM; list_for_each_entry(bus_res, &bus->resources, list) { if (n-- == 0) return bus_res->res; } return NULL; } EXPORT_SYMBOL_GPL(pci_bus_resource_n); void pci_bus_remove_resources(struct pci_bus *bus) { struct pci_bus_resource *bus_res, *tmp; int i; for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) bus->resource[i] = NULL; list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) { list_del(&bus_res->list); kfree(bus_res); } } /** * pci_bus_alloc_resource - allocate a resource from a parent bus * @bus: PCI bus * @res: resource to allocate * @size: size of resource to allocate * @align: alignment of resource to allocate * @min: minimum /proc/iomem address to allocate * @type_mask: IORESOURCE_* type flags * @alignf: resource alignment function * @alignf_data: data argument for resource alignment function * * Given the PCI bus a device resides on, the size, minimum address, * alignment and type, try to find an acceptable resource allocation * for a specific device resource. */ int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, resource_size_t size, resource_size_t align, resource_size_t min, unsigned int type_mask, resource_size_t (*alignf)(void *, const struct resource *, resource_size_t, resource_size_t), void *alignf_data) { int i, ret = -ENOMEM; struct resource *r; resource_size_t max = -1; type_mask |= IORESOURCE_IO | IORESOURCE_MEM; /* don't allocate too high if the pref mem doesn't support 64bit*/ if (!(res->flags & IORESOURCE_MEM_64)) max = PCIBIOS_MAX_MEM_32; pci_bus_for_each_resource(bus, r, i) { if (!r) continue; /* type_mask must match */ if ((res->flags ^ r->flags) & type_mask) continue; /* We cannot allocate a non-prefetching resource from a pre-fetching area */ if ((r->flags & IORESOURCE_PREFETCH) && !(res->flags & IORESOURCE_PREFETCH)) continue; /* Ok, try it out.. */ ret = allocate_resource(r, res, size, r->start ? : min, max, align, alignf, alignf_data); if (ret == 0) break; } return ret; } /** * pci_bus_add_device - add a single device * @dev: device to add * * This adds a single pci device to the global * device list and adds sysfs and procfs entries */ int pci_bus_add_device(struct pci_dev *dev) { int retval; retval = device_add(&dev->dev); if (retval) return retval; dev->is_added = 1; pci_proc_attach_device(dev); pci_create_sysfs_dev_files(dev); return 0; } /** * pci_bus_add_child - add a child bus * @bus: bus to add * * This adds sysfs entries for a single bus */ int pci_bus_add_child(struct pci_bus *bus) { int retval; if (bus->bridge) bus->dev.parent = bus->bridge; retval = device_register(&bus->dev); if (retval) return retval; bus->is_added = 1; retval = device_create_file(&bus->dev, &dev_attr_cpuaffinity); if (retval) return retval; retval = device_create_file(&bus->dev, &dev_attr_cpulistaffinity); /* Create legacy_io and legacy_mem files for this bus */ pci_create_legacy_files(bus); return retval; } /** * pci_bus_add_devices - insert newly discovered PCI devices * @bus: bus to check for new devices * * Add newly discovered PCI devices (which are on the bus->devices * list) to the global PCI device list, add the sysfs and procfs * entries. Where a bridge is found, add the discovered bus to * the parents list of child buses, and recurse (breadth-first * to be compatible with 2.4) * * Call hotplug for each new devices. */ void pci_bus_add_devices(const struct pci_bus *bus) { struct pci_dev *dev; struct pci_bus *child; int retval; list_for_each_entry(dev, &bus->devices, bus_list) { /* Skip already-added devices */ if (dev->is_added) continue; retval = pci_bus_add_device(dev); if (retval) dev_err(&dev->dev, "Error adding device, continuing\n"); } list_for_each_entry(dev, &bus->devices, bus_list) { BUG_ON(!dev->is_added); child = dev->subordinate; /* * If there is an unattached subordinate bus, attach * it and then scan for unattached PCI devices. */ if (!child) continue; if (list_empty(&child->node)) { down_write(&pci_bus_sem); list_add_tail(&child->node, &dev->bus->children); up_write(&pci_bus_sem); } pci_bus_add_devices(child); /* * register the bus with sysfs as the parent is now * properly registered. */ if (child->is_added) continue; retval = pci_bus_add_child(child); if (retval) dev_err(&dev->dev, "Error adding bus, continuing\n"); } } void pci_enable_bridges(struct pci_bus *bus) { struct pci_dev *dev; int retval; list_for_each_entry(dev, &bus->devices, bus_list) { if (dev->subordinate) { if (!pci_is_enabled(dev)) { retval = pci_enable_device(dev); if (retval) dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval); pci_set_master(dev); } pci_enable_bridges(dev->subordinate); } } } /** pci_walk_bus - walk devices on/under bus, calling callback. * @top bus whose devices should be walked * @cb callback to be called for each device found * @userdata arbitrary pointer to be passed to callback. * * Walk the given bus, including any bridged devices * on buses under this bus. Call the provided callback * on each device found. * * We check the return of @cb each time. If it returns anything * other than 0, we break out. * */ void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), void *userdata) { struct pci_dev *dev; struct pci_bus *bus; struct list_head *next; int retval; bus = top; down_read(&pci_bus_sem); next = top->devices.next; for (;;) { if (next == &bus->devices) { /* end of this bus, go up or finish */ if (bus == top) break; next = bus->self->bus_list.next; bus = bus->self->bus; continue; } dev = list_entry(next, struct pci_dev, bus_list); if (dev->subordinate) { /* this is a pci-pci bridge, do its devices next */ next = dev->subordinate->devices.next; bus = dev->subordinate; } else next = dev->bus_list.next; /* Run device routines with the device locked */ device_lock(&dev->dev); retval = cb(dev, userdata); device_unlock(&dev->dev); if (retval) break; } up_read(&pci_bus_sem); } EXPORT_SYMBOL_GPL(pci_walk_bus); EXPORT_SYMBOL(pci_bus_alloc_resource); EXPORT_SYMBOL_GPL(pci_bus_add_device); EXPORT_SYMBOL(pci_bus_add_devices); EXPORT_SYMBOL(pci_enable_bridges);