blob: 999cc4088b5952beb76e018e573afff4b53fba04 [file] [log] [blame]
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 */
Sam Ravnborg96bde062007-03-26 21:53:30 -080080int 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
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -080087 dev->is_added = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 pci_proc_attach_device(dev);
89 pci_create_sysfs_dev_files(dev);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -070090 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091}
92
93/**
94 * pci_bus_add_devices - insert newly discovered PCI devices
95 * @bus: bus to check for new devices
96 *
97 * Add newly discovered PCI devices (which are on the bus->devices
98 * list) to the global PCI device list, add the sysfs and procfs
99 * entries. Where a bridge is found, add the discovered bus to
100 * the parents list of child buses, and recurse (breadth-first
101 * to be compatible with 2.4)
102 *
103 * Call hotplug for each new devices.
104 */
Sam Ravnborg96bde062007-03-26 21:53:30 -0800105void pci_bus_add_devices(struct pci_bus *bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106{
107 struct pci_dev *dev;
Greg Kroah-Hartmanfd7d1ce2007-05-22 22:47:54 -0400108 struct pci_bus *child_bus;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700109 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111 list_for_each_entry(dev, &bus->devices, bus_list) {
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800112 /* Skip already-added devices */
113 if (dev->is_added)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 continue;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700115 retval = pci_bus_add_device(dev);
116 if (retval)
117 dev_err(&dev->dev, "Error adding device, continuing\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 }
119
120 list_for_each_entry(dev, &bus->devices, bus_list) {
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800121 BUG_ON(!dev->is_added);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
123 /*
124 * If there is an unattached subordinate bus, attach
125 * it and then scan for unattached PCI devices.
126 */
Rajesh Shah6ef6f0e2005-04-28 00:25:49 -0700127 if (dev->subordinate) {
128 if (list_empty(&dev->subordinate->node)) {
Zhang Yanmind71374d2006-06-02 12:35:43 +0800129 down_write(&pci_bus_sem);
Rajesh Shah6ef6f0e2005-04-28 00:25:49 -0700130 list_add_tail(&dev->subordinate->node,
131 &dev->bus->children);
Zhang Yanmind71374d2006-06-02 12:35:43 +0800132 up_write(&pci_bus_sem);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700133 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 pci_bus_add_devices(dev->subordinate);
Greg Kroah-Hartmanfd7d1ce2007-05-22 22:47:54 -0400135
136 /* register the bus with sysfs as the parent is now
137 * properly registered. */
138 child_bus = dev->subordinate;
Greg Kroah-Hartmancc74d962008-03-12 21:48:03 -0700139 if (child_bus->is_added)
140 continue;
Greg Kroah-Hartmanfd7d1ce2007-05-22 22:47:54 -0400141 child_bus->dev.parent = child_bus->bridge;
142 retval = device_register(&child_bus->dev);
Greg Kroah-Hartman4725e7b2008-03-03 14:47:13 -0800143 if (retval)
144 dev_err(&dev->dev, "Error registering pci_bus,"
145 " continuing...\n");
Greg Kroah-Hartmancc74d962008-03-12 21:48:03 -0700146 else {
147 child_bus->is_added = 1;
Greg Kroah-Hartmanfd7d1ce2007-05-22 22:47:54 -0400148 retval = device_create_file(&child_bus->dev,
149 &dev_attr_cpuaffinity);
Greg Kroah-Hartmancc74d962008-03-12 21:48:03 -0700150 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700151 if (retval)
Greg Kroah-Hartman4725e7b2008-03-03 14:47:13 -0800152 dev_err(&dev->dev, "Error creating cpuaffinity"
153 " file, continuing...\n");
Mike Travis93ff68a2008-09-06 05:46:42 -0700154
155 retval = device_create_file(&child_bus->dev,
156 &dev_attr_cpulistaffinity);
157 if (retval)
158 dev_err(&dev->dev,
159 "Error creating cpulistaffinity"
160 " file, continuing...\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 }
162 }
163}
164
165void pci_enable_bridges(struct pci_bus *bus)
166{
167 struct pci_dev *dev;
Greg Kroah-Hartman95a62962005-07-28 11:37:33 -0700168 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170 list_for_each_entry(dev, &bus->devices, bus_list) {
171 if (dev->subordinate) {
Greg Kroah-Hartman95a62962005-07-28 11:37:33 -0700172 retval = pci_enable_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 pci_set_master(dev);
174 pci_enable_bridges(dev->subordinate);
175 }
176 }
177}
178
Paul Mackerrascecf4862005-08-18 14:33:01 +1000179/** pci_walk_bus - walk devices on/under bus, calling callback.
180 * @top bus whose devices should be walked
181 * @cb callback to be called for each device found
182 * @userdata arbitrary pointer to be passed to callback.
183 *
184 * Walk the given bus, including any bridged devices
185 * on buses under this bus. Call the provided callback
186 * on each device found.
187 */
188void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *),
189 void *userdata)
190{
191 struct pci_dev *dev;
192 struct pci_bus *bus;
193 struct list_head *next;
194
195 bus = top;
Zhang Yanmind71374d2006-06-02 12:35:43 +0800196 down_read(&pci_bus_sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000197 next = top->devices.next;
198 for (;;) {
199 if (next == &bus->devices) {
200 /* end of this bus, go up or finish */
201 if (bus == top)
202 break;
203 next = bus->self->bus_list.next;
204 bus = bus->self->bus;
205 continue;
206 }
207 dev = list_entry(next, struct pci_dev, bus_list);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000208 if (dev->subordinate) {
209 /* this is a pci-pci bridge, do its devices next */
210 next = dev->subordinate->devices.next;
211 bus = dev->subordinate;
212 } else
213 next = dev->bus_list.next;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000214
Zhang Yanmind71374d2006-06-02 12:35:43 +0800215 /* Run device routines with the device locked */
216 down(&dev->dev.sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000217 cb(dev, userdata);
Zhang Yanmind71374d2006-06-02 12:35:43 +0800218 up(&dev->dev.sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000219 }
Zhang Yanmind71374d2006-06-02 12:35:43 +0800220 up_read(&pci_bus_sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000221}
Paul Mackerrascecf4862005-08-18 14:33:01 +1000222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223EXPORT_SYMBOL(pci_bus_alloc_resource);
224EXPORT_SYMBOL_GPL(pci_bus_add_device);
225EXPORT_SYMBOL(pci_bus_add_devices);
226EXPORT_SYMBOL(pci_enable_bridges);