blob: 7f0af0e9b826dafa2e64d8302c130ea87e5af00b [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19#include "pci.h"
20
Bjorn Helgaas2fe2abf2010-02-23 10:24:36 -070021void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
22 unsigned int flags)
23{
24 struct pci_bus_resource *bus_res;
25
26 bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
27 if (!bus_res) {
28 dev_err(&bus->dev, "can't add %pR resource\n", res);
29 return;
30 }
31
32 bus_res->res = res;
33 bus_res->flags = flags;
34 list_add_tail(&bus_res->list, &bus->resources);
35}
36
37struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
38{
39 struct pci_bus_resource *bus_res;
40
41 if (n < PCI_BRIDGE_RESOURCE_NUM)
42 return bus->resource[n];
43
44 n -= PCI_BRIDGE_RESOURCE_NUM;
45 list_for_each_entry(bus_res, &bus->resources, list) {
46 if (n-- == 0)
47 return bus_res->res;
48 }
49 return NULL;
50}
51EXPORT_SYMBOL_GPL(pci_bus_resource_n);
52
53void pci_bus_remove_resources(struct pci_bus *bus)
54{
55 struct pci_bus_resource *bus_res, *tmp;
56 int i;
57
58 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
Stephen Hemminger7736a052010-06-01 09:00:16 -070059 bus->resource[i] = NULL;
Bjorn Helgaas2fe2abf2010-02-23 10:24:36 -070060
61 list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
62 list_del(&bus_res->list);
63 kfree(bus_res);
64 }
65}
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067/**
68 * pci_bus_alloc_resource - allocate a resource from a parent bus
69 * @bus: PCI bus
70 * @res: resource to allocate
71 * @size: size of resource to allocate
72 * @align: alignment of resource to allocate
73 * @min: minimum /proc/iomem address to allocate
74 * @type_mask: IORESOURCE_* type flags
75 * @alignf: resource alignment function
76 * @alignf_data: data argument for resource alignment function
77 *
78 * Given the PCI bus a device resides on, the size, minimum address,
79 * alignment and type, try to find an acceptable resource allocation
80 * for a specific device resource.
81 */
82int
83pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -070084 resource_size_t size, resource_size_t align,
85 resource_size_t min, unsigned int type_mask,
Dominik Brodowskib26b2d42010-01-01 17:40:49 +010086 resource_size_t (*alignf)(void *,
Dominik Brodowski3b7a17f2010-01-01 17:40:50 +010087 const struct resource *,
Dominik Brodowskib26b2d42010-01-01 17:40:49 +010088 resource_size_t,
89 resource_size_t),
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -070090 void *alignf_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -070091{
92 int i, ret = -ENOMEM;
Bjorn Helgaas89a74ec2010-02-23 10:24:31 -070093 struct resource *r;
Yinghai Lu1f82de12009-04-23 20:48:32 -070094 resource_size_t max = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96 type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
97
Yinghai Lu1f82de12009-04-23 20:48:32 -070098 /* don't allocate too high if the pref mem doesn't support 64bit*/
99 if (!(res->flags & IORESOURCE_MEM_64))
100 max = PCIBIOS_MAX_MEM_32;
101
Bjorn Helgaas89a74ec2010-02-23 10:24:31 -0700102 pci_bus_for_each_resource(bus, r, i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 if (!r)
104 continue;
105
106 /* type_mask must match */
107 if ((res->flags ^ r->flags) & type_mask)
108 continue;
109
110 /* We cannot allocate a non-prefetching resource
111 from a pre-fetching area */
112 if ((r->flags & IORESOURCE_PREFETCH) &&
113 !(res->flags & IORESOURCE_PREFETCH))
114 continue;
115
116 /* Ok, try it out.. */
Linus Torvalds688d1912005-08-02 14:55:40 -0700117 ret = allocate_resource(r, res, size,
118 r->start ? : min,
Yinghai Lu1f82de12009-04-23 20:48:32 -0700119 max, align,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 alignf, alignf_data);
121 if (ret == 0)
122 break;
123 }
124 return ret;
125}
126
127/**
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800128 * pci_bus_add_device - add a single device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 * @dev: device to add
130 *
131 * This adds a single pci device to the global
132 * device list and adds sysfs and procfs entries
133 */
Sam Ravnborg96bde062007-03-26 21:53:30 -0800134int pci_bus_add_device(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700136 int retval;
137 retval = device_add(&dev->dev);
138 if (retval)
139 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800141 dev->is_added = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 pci_proc_attach_device(dev);
143 pci_create_sysfs_dev_files(dev);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700144 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145}
146
147/**
Yu Zhao876e5012008-11-22 02:42:35 +0800148 * pci_bus_add_child - add a child bus
149 * @bus: bus to add
150 *
151 * This adds sysfs entries for a single bus
152 */
153int pci_bus_add_child(struct pci_bus *bus)
154{
155 int retval;
156
157 if (bus->bridge)
158 bus->dev.parent = bus->bridge;
159
160 retval = device_register(&bus->dev);
161 if (retval)
162 return retval;
163
164 bus->is_added = 1;
165
166 retval = device_create_file(&bus->dev, &dev_attr_cpuaffinity);
167 if (retval)
168 return retval;
169
170 retval = device_create_file(&bus->dev, &dev_attr_cpulistaffinity);
171
172 /* Create legacy_io and legacy_mem files for this bus */
173 pci_create_legacy_files(bus);
174
175 return retval;
176}
177
178/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 * pci_bus_add_devices - insert newly discovered PCI devices
180 * @bus: bus to check for new devices
181 *
182 * Add newly discovered PCI devices (which are on the bus->devices
183 * list) to the global PCI device list, add the sysfs and procfs
184 * entries. Where a bridge is found, add the discovered bus to
185 * the parents list of child buses, and recurse (breadth-first
186 * to be compatible with 2.4)
187 *
188 * Call hotplug for each new devices.
189 */
akpm@linux-foundation.orgc48f1672009-02-03 15:45:26 -0800190void pci_bus_add_devices(const struct pci_bus *bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
192 struct pci_dev *dev;
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800193 struct pci_bus *child;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700194 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
196 list_for_each_entry(dev, &bus->devices, bus_list) {
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800197 /* Skip already-added devices */
198 if (dev->is_added)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 continue;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700200 retval = pci_bus_add_device(dev);
201 if (retval)
202 dev_err(&dev->dev, "Error adding device, continuing\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 }
204
205 list_for_each_entry(dev, &bus->devices, bus_list) {
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800206 BUG_ON(!dev->is_added);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800208 child = dev->subordinate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 /*
210 * If there is an unattached subordinate bus, attach
211 * it and then scan for unattached PCI devices.
212 */
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800213 if (!child)
214 continue;
215 if (list_empty(&child->node)) {
216 down_write(&pci_bus_sem);
217 list_add_tail(&child->node, &dev->bus->children);
218 up_write(&pci_bus_sem);
219 }
220 pci_bus_add_devices(child);
Greg Kroah-Hartmanfd7d1ce2007-05-22 22:47:54 -0400221
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800222 /*
223 * register the bus with sysfs as the parent is now
224 * properly registered.
225 */
226 if (child->is_added)
227 continue;
Yu Zhao876e5012008-11-22 02:42:35 +0800228 retval = pci_bus_add_child(child);
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800229 if (retval)
Yu Zhao876e5012008-11-22 02:42:35 +0800230 dev_err(&dev->dev, "Error adding bus, continuing\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 }
232}
233
234void pci_enable_bridges(struct pci_bus *bus)
235{
236 struct pci_dev *dev;
Greg Kroah-Hartman95a62962005-07-28 11:37:33 -0700237 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239 list_for_each_entry(dev, &bus->devices, bus_list) {
240 if (dev->subordinate) {
Yuji Shimada296ccb02009-04-03 16:41:46 +0900241 if (!pci_is_enabled(dev)) {
Alex Chiang9dd90ca2009-03-20 14:56:20 -0600242 retval = pci_enable_device(dev);
Junchang Wang2eb5ebd2010-06-18 10:02:33 +0800243 if (retval)
244 dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval);
Alex Chiang9dd90ca2009-03-20 14:56:20 -0600245 pci_set_master(dev);
246 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 pci_enable_bridges(dev->subordinate);
248 }
249 }
250}
251
Paul Mackerrascecf4862005-08-18 14:33:01 +1000252/** pci_walk_bus - walk devices on/under bus, calling callback.
253 * @top bus whose devices should be walked
254 * @cb callback to be called for each device found
255 * @userdata arbitrary pointer to be passed to callback.
256 *
257 * Walk the given bus, including any bridged devices
258 * on buses under this bus. Call the provided callback
259 * on each device found.
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800260 *
261 * We check the return of @cb each time. If it returns anything
262 * other than 0, we break out.
263 *
Paul Mackerrascecf4862005-08-18 14:33:01 +1000264 */
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800265void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
Paul Mackerrascecf4862005-08-18 14:33:01 +1000266 void *userdata)
267{
268 struct pci_dev *dev;
269 struct pci_bus *bus;
270 struct list_head *next;
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800271 int retval;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000272
273 bus = top;
Zhang Yanmind71374d2006-06-02 12:35:43 +0800274 down_read(&pci_bus_sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000275 next = top->devices.next;
276 for (;;) {
277 if (next == &bus->devices) {
278 /* end of this bus, go up or finish */
279 if (bus == top)
280 break;
281 next = bus->self->bus_list.next;
282 bus = bus->self->bus;
283 continue;
284 }
285 dev = list_entry(next, struct pci_dev, bus_list);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000286 if (dev->subordinate) {
287 /* this is a pci-pci bridge, do its devices next */
288 next = dev->subordinate->devices.next;
289 bus = dev->subordinate;
290 } else
291 next = dev->bus_list.next;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000292
Zhang Yanmind71374d2006-06-02 12:35:43 +0800293 /* Run device routines with the device locked */
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800294 device_lock(&dev->dev);
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800295 retval = cb(dev, userdata);
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800296 device_unlock(&dev->dev);
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800297 if (retval)
298 break;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000299 }
Zhang Yanmind71374d2006-06-02 12:35:43 +0800300 up_read(&pci_bus_sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000301}
Paul Mackerrascecf4862005-08-18 14:33:01 +1000302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303EXPORT_SYMBOL(pci_bus_alloc_resource);
304EXPORT_SYMBOL_GPL(pci_bus_add_device);
305EXPORT_SYMBOL(pci_bus_add_devices);
306EXPORT_SYMBOL(pci_enable_bridges);