blob: 68f91a25259563c6bb7250d8ea3acfd636ad0b29 [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/**
Yu Zhao3fa16fd2008-11-22 02:41:45 +080074 * pci_bus_add_device - add a single device
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 * @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/**
Yu Zhao876e5012008-11-22 02:42:35 +080094 * pci_bus_add_child - add a child bus
95 * @bus: bus to add
96 *
97 * This adds sysfs entries for a single bus
98 */
99int pci_bus_add_child(struct pci_bus *bus)
100{
101 int retval;
102
103 if (bus->bridge)
104 bus->dev.parent = bus->bridge;
105
106 retval = device_register(&bus->dev);
107 if (retval)
108 return retval;
109
110 bus->is_added = 1;
111
112 retval = device_create_file(&bus->dev, &dev_attr_cpuaffinity);
113 if (retval)
114 return retval;
115
116 retval = device_create_file(&bus->dev, &dev_attr_cpulistaffinity);
117
118 /* Create legacy_io and legacy_mem files for this bus */
119 pci_create_legacy_files(bus);
120
121 return retval;
122}
123
124/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 * pci_bus_add_devices - insert newly discovered PCI devices
126 * @bus: bus to check for new devices
127 *
128 * Add newly discovered PCI devices (which are on the bus->devices
129 * list) to the global PCI device list, add the sysfs and procfs
130 * entries. Where a bridge is found, add the discovered bus to
131 * the parents list of child buses, and recurse (breadth-first
132 * to be compatible with 2.4)
133 *
134 * Call hotplug for each new devices.
135 */
akpm@linux-foundation.orgc48f1672009-02-03 15:45:26 -0800136void pci_bus_add_devices(const struct pci_bus *bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137{
138 struct pci_dev *dev;
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800139 struct pci_bus *child;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700140 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142 list_for_each_entry(dev, &bus->devices, bus_list) {
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800143 /* Skip already-added devices */
144 if (dev->is_added)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 continue;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700146 retval = pci_bus_add_device(dev);
147 if (retval)
148 dev_err(&dev->dev, "Error adding device, continuing\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 }
150
151 list_for_each_entry(dev, &bus->devices, bus_list) {
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800152 BUG_ON(!dev->is_added);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800154 child = dev->subordinate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 /*
156 * If there is an unattached subordinate bus, attach
157 * it and then scan for unattached PCI devices.
158 */
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800159 if (!child)
160 continue;
161 if (list_empty(&child->node)) {
162 down_write(&pci_bus_sem);
163 list_add_tail(&child->node, &dev->bus->children);
164 up_write(&pci_bus_sem);
165 }
166 pci_bus_add_devices(child);
Greg Kroah-Hartmanfd7d1ce2007-05-22 22:47:54 -0400167
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800168 /*
169 * register the bus with sysfs as the parent is now
170 * properly registered.
171 */
172 if (child->is_added)
173 continue;
Yu Zhao876e5012008-11-22 02:42:35 +0800174 retval = pci_bus_add_child(child);
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800175 if (retval)
Yu Zhao876e5012008-11-22 02:42:35 +0800176 dev_err(&dev->dev, "Error adding bus, continuing\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 }
178}
179
180void pci_enable_bridges(struct pci_bus *bus)
181{
182 struct pci_dev *dev;
Greg Kroah-Hartman95a62962005-07-28 11:37:33 -0700183 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
185 list_for_each_entry(dev, &bus->devices, bus_list) {
186 if (dev->subordinate) {
Alex Chiang9dd90ca2009-03-20 14:56:20 -0600187 if (atomic_read(&dev->enable_cnt) == 0) {
188 retval = pci_enable_device(dev);
189 pci_set_master(dev);
190 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 pci_enable_bridges(dev->subordinate);
192 }
193 }
194}
195
Paul Mackerrascecf4862005-08-18 14:33:01 +1000196/** pci_walk_bus - walk devices on/under bus, calling callback.
197 * @top bus whose devices should be walked
198 * @cb callback to be called for each device found
199 * @userdata arbitrary pointer to be passed to callback.
200 *
201 * Walk the given bus, including any bridged devices
202 * on buses under this bus. Call the provided callback
203 * on each device found.
204 */
205void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *),
206 void *userdata)
207{
208 struct pci_dev *dev;
209 struct pci_bus *bus;
210 struct list_head *next;
211
212 bus = top;
Zhang Yanmind71374d2006-06-02 12:35:43 +0800213 down_read(&pci_bus_sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000214 next = top->devices.next;
215 for (;;) {
216 if (next == &bus->devices) {
217 /* end of this bus, go up or finish */
218 if (bus == top)
219 break;
220 next = bus->self->bus_list.next;
221 bus = bus->self->bus;
222 continue;
223 }
224 dev = list_entry(next, struct pci_dev, bus_list);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000225 if (dev->subordinate) {
226 /* this is a pci-pci bridge, do its devices next */
227 next = dev->subordinate->devices.next;
228 bus = dev->subordinate;
229 } else
230 next = dev->bus_list.next;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000231
Zhang Yanmind71374d2006-06-02 12:35:43 +0800232 /* Run device routines with the device locked */
233 down(&dev->dev.sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000234 cb(dev, userdata);
Zhang Yanmind71374d2006-06-02 12:35:43 +0800235 up(&dev->dev.sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000236 }
Zhang Yanmind71374d2006-06-02 12:35:43 +0800237 up_read(&pci_bus_sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000238}
Paul Mackerrascecf4862005-08-18 14:33:01 +1000239
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240EXPORT_SYMBOL(pci_bus_alloc_resource);
241EXPORT_SYMBOL_GPL(pci_bus_add_device);
242EXPORT_SYMBOL(pci_bus_add_devices);
243EXPORT_SYMBOL(pci_enable_bridges);