4 * From setup-res.c, by:
5 * Dave Rusling (david.rusling@reo.mts.dec.com)
6 * David Mosberger (davidm@cs.arizona.edu)
7 * David Miller (davem@redhat.com)
8 * Ivan Kokshaysky (ink@jurassic.park.msu.ru)
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/pci.h>
13 #include <linux/errno.h>
14 #include <linux/ioport.h>
15 #include <linux/proc_fs.h>
16 #include <linux/init.h>
21 * pci_bus_alloc_resource - allocate a resource from a parent bus
23 * @res: resource to allocate
24 * @size: size of resource to allocate
25 * @align: alignment of resource to allocate
26 * @min: minimum /proc/iomem address to allocate
27 * @type_mask: IORESOURCE_* type flags
28 * @alignf: resource alignment function
29 * @alignf_data: data argument for resource alignment function
31 * Given the PCI bus a device resides on, the size, minimum address,
32 * alignment and type, try to find an acceptable resource allocation
33 * for a specific device resource.
36 pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
37 resource_size_t size, resource_size_t align,
38 resource_size_t min, unsigned int type_mask,
39 void (*alignf)(void *, struct resource *, resource_size_t,
45 type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
47 for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
48 struct resource *r = bus->resource[i];
52 /* type_mask must match */
53 if ((res->flags ^ r->flags) & type_mask)
56 /* We cannot allocate a non-prefetching resource
57 from a pre-fetching area */
58 if ((r->flags & IORESOURCE_PREFETCH) &&
59 !(res->flags & IORESOURCE_PREFETCH))
62 /* Ok, try it out.. */
63 ret = allocate_resource(r, res, size,
77 * This adds a single pci device to the global
78 * device list and adds sysfs and procfs entries
80 void __devinit pci_bus_add_device(struct pci_dev *dev)
82 device_add(&dev->dev);
84 down_write(&pci_bus_sem);
85 list_add_tail(&dev->global_list, &pci_devices);
86 up_write(&pci_bus_sem);
88 pci_proc_attach_device(dev);
89 pci_create_sysfs_dev_files(dev);
93 * pci_bus_add_devices - insert newly discovered PCI devices
94 * @bus: bus to check for new devices
96 * Add newly discovered PCI devices (which are on the bus->devices
97 * list) to the global PCI device list, add the sysfs and procfs
98 * entries. Where a bridge is found, add the discovered bus to
99 * the parents list of child buses, and recurse (breadth-first
100 * to be compatible with 2.4)
102 * Call hotplug for each new devices.
104 void __devinit pci_bus_add_devices(struct pci_bus *bus)
108 list_for_each_entry(dev, &bus->devices, bus_list) {
110 * Skip already-present devices (which are on the
111 * global device list.)
113 if (!list_empty(&dev->global_list))
115 pci_bus_add_device(dev);
118 list_for_each_entry(dev, &bus->devices, bus_list) {
120 BUG_ON(list_empty(&dev->global_list));
123 * If there is an unattached subordinate bus, attach
124 * it and then scan for unattached PCI devices.
126 if (dev->subordinate) {
127 if (list_empty(&dev->subordinate->node)) {
128 down_write(&pci_bus_sem);
129 list_add_tail(&dev->subordinate->node,
130 &dev->bus->children);
131 up_write(&pci_bus_sem);
133 pci_bus_add_devices(dev->subordinate);
135 sysfs_create_link(&dev->subordinate->class_dev.kobj, &dev->dev.kobj, "bridge");
140 void pci_enable_bridges(struct pci_bus *bus)
145 list_for_each_entry(dev, &bus->devices, bus_list) {
146 if (dev->subordinate) {
147 retval = pci_enable_device(dev);
149 pci_enable_bridges(dev->subordinate);
154 /** pci_walk_bus - walk devices on/under bus, calling callback.
155 * @top bus whose devices should be walked
156 * @cb callback to be called for each device found
157 * @userdata arbitrary pointer to be passed to callback.
159 * Walk the given bus, including any bridged devices
160 * on buses under this bus. Call the provided callback
161 * on each device found.
163 void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *),
168 struct list_head *next;
171 down_read(&pci_bus_sem);
172 next = top->devices.next;
174 if (next == &bus->devices) {
175 /* end of this bus, go up or finish */
178 next = bus->self->bus_list.next;
179 bus = bus->self->bus;
182 dev = list_entry(next, struct pci_dev, bus_list);
183 if (dev->subordinate) {
184 /* this is a pci-pci bridge, do its devices next */
185 next = dev->subordinate->devices.next;
186 bus = dev->subordinate;
188 next = dev->bus_list.next;
190 /* Run device routines with the device locked */
195 up_read(&pci_bus_sem);
197 EXPORT_SYMBOL_GPL(pci_walk_bus);
199 EXPORT_SYMBOL(pci_bus_alloc_resource);
200 EXPORT_SYMBOL_GPL(pci_bus_add_device);
201 EXPORT_SYMBOL(pci_bus_add_devices);
202 EXPORT_SYMBOL(pci_enable_bridges);