| /* |
| * 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 "pci.h" |
| |
| /** |
| * 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, |
| void (*alignf)(void *, struct resource *, resource_size_t, |
| resource_size_t), |
| void *alignf_data) |
| { |
| int i, ret = -ENOMEM; |
| |
| type_mask |= IORESOURCE_IO | IORESOURCE_MEM; |
| |
| for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) { |
| struct resource *r = bus->resource[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, |
| -1, align, |
| alignf, alignf_data); |
| if (ret == 0) |
| break; |
| } |
| return ret; |
| } |
| |
| /** |
| * 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_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(struct pci_bus *bus) |
| { |
| struct pci_dev *dev; |
| struct pci_bus *child_bus; |
| 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); |
| |
| /* |
| * If there is an unattached subordinate bus, attach |
| * it and then scan for unattached PCI devices. |
| */ |
| if (dev->subordinate) { |
| if (list_empty(&dev->subordinate->node)) { |
| down_write(&pci_bus_sem); |
| list_add_tail(&dev->subordinate->node, |
| &dev->bus->children); |
| up_write(&pci_bus_sem); |
| } |
| pci_bus_add_devices(dev->subordinate); |
| |
| /* register the bus with sysfs as the parent is now |
| * properly registered. */ |
| child_bus = dev->subordinate; |
| if (child_bus->is_added) |
| continue; |
| child_bus->dev.parent = child_bus->bridge; |
| retval = device_register(&child_bus->dev); |
| if (retval) |
| dev_err(&dev->dev, "Error registering pci_bus," |
| " continuing...\n"); |
| else { |
| child_bus->is_added = 1; |
| retval = device_create_file(&child_bus->dev, |
| &dev_attr_cpuaffinity); |
| } |
| if (retval) |
| dev_err(&dev->dev, "Error creating cpuaffinity" |
| " file, continuing...\n"); |
| |
| retval = device_create_file(&child_bus->dev, |
| &dev_attr_cpulistaffinity); |
| if (retval) |
| dev_err(&dev->dev, |
| "Error creating cpulistaffinity" |
| " file, continuing...\n"); |
| |
| /* Create legacy_io and legacy_mem files for this bus */ |
| pci_create_legacy_files(child_bus); |
| |
| } |
| } |
| } |
| |
| 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) { |
| retval = pci_enable_device(dev); |
| 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. |
| */ |
| void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *), |
| void *userdata) |
| { |
| struct pci_dev *dev; |
| struct pci_bus *bus; |
| struct list_head *next; |
| |
| 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 */ |
| down(&dev->dev.sem); |
| cb(dev, userdata); |
| up(&dev->dev.sem); |
| } |
| up_read(&pci_bus_sem); |
| } |
| |
| EXPORT_SYMBOL(pci_bus_alloc_resource); |
| EXPORT_SYMBOL_GPL(pci_bus_add_device); |
| EXPORT_SYMBOL(pci_bus_add_devices); |
| EXPORT_SYMBOL(pci_enable_bridges); |