[PATCH] qla2xxx: Kconfig dependency fix
[linux-2.6/kvm.git] / drivers / pci / bus.c
blobfedae89d8f7d5678b7b7126a084b8a49a9939858
1 /*
2 * drivers/pci/bus.c
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)
9 */
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>
18 #include "pci.h"
20 /**
21 * pci_bus_alloc_resource - allocate a resource from a parent bus
22 * @bus: PCI 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.
35 int
36 pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
37 unsigned long size, unsigned long align, unsigned long min,
38 unsigned int type_mask,
39 void (*alignf)(void *, struct resource *,
40 unsigned long, unsigned long),
41 void *alignf_data)
43 int i, ret = -ENOMEM;
45 type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
47 for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
48 struct resource *r = bus->resource[i];
49 if (!r)
50 continue;
52 /* type_mask must match */
53 if ((res->flags ^ r->flags) & type_mask)
54 continue;
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))
60 continue;
62 /* Ok, try it out.. */
63 ret = allocate_resource(r, res, size, min, -1, align,
64 alignf, alignf_data);
65 if (ret == 0)
66 break;
68 return ret;
71 /**
72 * add a single device
73 * @dev: device to add
75 * This adds a single pci device to the global
76 * device list and adds sysfs and procfs entries
78 void __devinit pci_bus_add_device(struct pci_dev *dev)
80 device_add(&dev->dev);
82 spin_lock(&pci_bus_lock);
83 list_add_tail(&dev->global_list, &pci_devices);
84 spin_unlock(&pci_bus_lock);
86 pci_proc_attach_device(dev);
87 pci_create_sysfs_dev_files(dev);
90 /**
91 * pci_bus_add_devices - insert newly discovered PCI devices
92 * @bus: bus to check for new devices
94 * Add newly discovered PCI devices (which are on the bus->devices
95 * list) to the global PCI device list, add the sysfs and procfs
96 * entries. Where a bridge is found, add the discovered bus to
97 * the parents list of child buses, and recurse (breadth-first
98 * to be compatible with 2.4)
100 * Call hotplug for each new devices.
102 void __devinit pci_bus_add_devices(struct pci_bus *bus)
104 struct pci_dev *dev;
106 list_for_each_entry(dev, &bus->devices, bus_list) {
108 * Skip already-present devices (which are on the
109 * global device list.)
111 if (!list_empty(&dev->global_list))
112 continue;
113 pci_bus_add_device(dev);
116 list_for_each_entry(dev, &bus->devices, bus_list) {
118 BUG_ON(list_empty(&dev->global_list));
121 * If there is an unattached subordinate bus, attach
122 * it and then scan for unattached PCI devices.
124 if (dev->subordinate) {
125 if (list_empty(&dev->subordinate->node)) {
126 spin_lock(&pci_bus_lock);
127 list_add_tail(&dev->subordinate->node,
128 &dev->bus->children);
129 spin_unlock(&pci_bus_lock);
131 pci_bus_add_devices(dev->subordinate);
133 sysfs_create_link(&dev->subordinate->class_dev.kobj, &dev->dev.kobj, "bridge");
138 void pci_enable_bridges(struct pci_bus *bus)
140 struct pci_dev *dev;
142 list_for_each_entry(dev, &bus->devices, bus_list) {
143 if (dev->subordinate) {
144 pci_enable_device(dev);
145 pci_set_master(dev);
146 pci_enable_bridges(dev->subordinate);
151 EXPORT_SYMBOL(pci_bus_alloc_resource);
152 EXPORT_SYMBOL_GPL(pci_bus_add_device);
153 EXPORT_SYMBOL(pci_bus_add_devices);
154 EXPORT_SYMBOL(pci_enable_bridges);