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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/pci/bus.c
3 *
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>
17
18#include "pci.h"
19
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
30 *
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.
34 */
35int
36pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -070037 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,
40 resource_size_t),
41 void *alignf_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042{
43 int i, ret = -ENOMEM;
44
45 type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
46
47 for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
48 struct resource *r = bus->resource[i];
49 if (!r)
50 continue;
51
52 /* type_mask must match */
53 if ((res->flags ^ r->flags) & type_mask)
54 continue;
55
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;
61
62 /* Ok, try it out.. */
Linus Torvalds688d1912005-08-02 14:55:40 -070063 ret = allocate_resource(r, res, size,
64 r->start ? : min,
65 -1, align,
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 alignf, alignf_data);
67 if (ret == 0)
68 break;
69 }
70 return ret;
71}
72
73/**
74 * add a single device
75 * @dev: device to add
76 *
77 * This adds a single pci device to the global
78 * device list and adds sysfs and procfs entries
79 */
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -070080int __devinit pci_bus_add_device(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081{
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -070082 int retval;
83 retval = device_add(&dev->dev);
84 if (retval)
85 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Zhang Yanmind71374d2006-06-02 12:35:43 +080087 down_write(&pci_bus_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 list_add_tail(&dev->global_list, &pci_devices);
Zhang Yanmind71374d2006-06-02 12:35:43 +080089 up_write(&pci_bus_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91 pci_proc_attach_device(dev);
92 pci_create_sysfs_dev_files(dev);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -070093 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094}
95
96/**
97 * pci_bus_add_devices - insert newly discovered PCI devices
98 * @bus: bus to check for new devices
99 *
100 * Add newly discovered PCI devices (which are on the bus->devices
101 * list) to the global PCI device list, add the sysfs and procfs
102 * entries. Where a bridge is found, add the discovered bus to
103 * the parents list of child buses, and recurse (breadth-first
104 * to be compatible with 2.4)
105 *
106 * Call hotplug for each new devices.
107 */
108void __devinit pci_bus_add_devices(struct pci_bus *bus)
109{
110 struct pci_dev *dev;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700111 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113 list_for_each_entry(dev, &bus->devices, bus_list) {
114 /*
115 * Skip already-present devices (which are on the
116 * global device list.)
117 */
118 if (!list_empty(&dev->global_list))
119 continue;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700120 retval = pci_bus_add_device(dev);
121 if (retval)
122 dev_err(&dev->dev, "Error adding device, continuing\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 }
124
125 list_for_each_entry(dev, &bus->devices, bus_list) {
126
127 BUG_ON(list_empty(&dev->global_list));
128
129 /*
130 * If there is an unattached subordinate bus, attach
131 * it and then scan for unattached PCI devices.
132 */
Rajesh Shah6ef6f0e2005-04-28 00:25:49 -0700133 if (dev->subordinate) {
134 if (list_empty(&dev->subordinate->node)) {
Zhang Yanmind71374d2006-06-02 12:35:43 +0800135 down_write(&pci_bus_sem);
Rajesh Shah6ef6f0e2005-04-28 00:25:49 -0700136 list_add_tail(&dev->subordinate->node,
137 &dev->bus->children);
Zhang Yanmind71374d2006-06-02 12:35:43 +0800138 up_write(&pci_bus_sem);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700139 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 pci_bus_add_devices(dev->subordinate);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700141 retval = sysfs_create_link(&dev->subordinate->class_dev.kobj,
142 &dev->dev.kobj, "bridge");
143 if (retval)
144 dev_err(&dev->dev, "Error creating sysfs "
145 "bridge symlink, continuing...\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 }
147 }
148}
149
150void pci_enable_bridges(struct pci_bus *bus)
151{
152 struct pci_dev *dev;
Greg Kroah-Hartman95a62962005-07-28 11:37:33 -0700153 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
155 list_for_each_entry(dev, &bus->devices, bus_list) {
156 if (dev->subordinate) {
Greg Kroah-Hartman95a62962005-07-28 11:37:33 -0700157 retval = pci_enable_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 pci_set_master(dev);
159 pci_enable_bridges(dev->subordinate);
160 }
161 }
162}
163
Paul Mackerrascecf4862005-08-18 14:33:01 +1000164/** pci_walk_bus - walk devices on/under bus, calling callback.
165 * @top bus whose devices should be walked
166 * @cb callback to be called for each device found
167 * @userdata arbitrary pointer to be passed to callback.
168 *
169 * Walk the given bus, including any bridged devices
170 * on buses under this bus. Call the provided callback
171 * on each device found.
172 */
173void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *),
174 void *userdata)
175{
176 struct pci_dev *dev;
177 struct pci_bus *bus;
178 struct list_head *next;
179
180 bus = top;
Zhang Yanmind71374d2006-06-02 12:35:43 +0800181 down_read(&pci_bus_sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000182 next = top->devices.next;
183 for (;;) {
184 if (next == &bus->devices) {
185 /* end of this bus, go up or finish */
186 if (bus == top)
187 break;
188 next = bus->self->bus_list.next;
189 bus = bus->self->bus;
190 continue;
191 }
192 dev = list_entry(next, struct pci_dev, bus_list);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000193 if (dev->subordinate) {
194 /* this is a pci-pci bridge, do its devices next */
195 next = dev->subordinate->devices.next;
196 bus = dev->subordinate;
197 } else
198 next = dev->bus_list.next;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000199
Zhang Yanmind71374d2006-06-02 12:35:43 +0800200 /* Run device routines with the device locked */
201 down(&dev->dev.sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000202 cb(dev, userdata);
Zhang Yanmind71374d2006-06-02 12:35:43 +0800203 up(&dev->dev.sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000204 }
Zhang Yanmind71374d2006-06-02 12:35:43 +0800205 up_read(&pci_bus_sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000206}
207EXPORT_SYMBOL_GPL(pci_walk_bus);
208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209EXPORT_SYMBOL(pci_bus_alloc_resource);
210EXPORT_SYMBOL_GPL(pci_bus_add_device);
211EXPORT_SYMBOL(pci_bus_add_devices);
212EXPORT_SYMBOL(pci_enable_bridges);