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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>
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 Helgaas0efd5aa2012-02-23 20:19:00 -070021void pci_add_resource_offset(struct list_head *resources, struct resource *res,
22 resource_size_t offset)
Bjorn Helgaas45ca9e92011-10-28 16:25:35 -060023{
Bjorn Helgaas0efd5aa2012-02-23 20:19:00 -070024 struct pci_host_bridge_window *window;
Bjorn Helgaas45ca9e92011-10-28 16:25:35 -060025
Bjorn Helgaas0efd5aa2012-02-23 20:19:00 -070026 window = kzalloc(sizeof(struct pci_host_bridge_window), GFP_KERNEL);
27 if (!window) {
28 printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
Bjorn Helgaas45ca9e92011-10-28 16:25:35 -060029 return;
30 }
31
Bjorn Helgaas0efd5aa2012-02-23 20:19:00 -070032 window->res = res;
33 window->offset = offset;
34 list_add_tail(&window->list, resources);
35}
36EXPORT_SYMBOL(pci_add_resource_offset);
37
38void pci_add_resource(struct list_head *resources, struct resource *res)
39{
40 pci_add_resource_offset(resources, res, 0);
Bjorn Helgaas45ca9e92011-10-28 16:25:35 -060041}
42EXPORT_SYMBOL(pci_add_resource);
43
44void pci_free_resource_list(struct list_head *resources)
45{
Bjorn Helgaas0efd5aa2012-02-23 20:19:00 -070046 struct pci_host_bridge_window *window, *tmp;
Bjorn Helgaas45ca9e92011-10-28 16:25:35 -060047
Bjorn Helgaas0efd5aa2012-02-23 20:19:00 -070048 list_for_each_entry_safe(window, tmp, resources, list) {
49 list_del(&window->list);
50 kfree(window);
Bjorn Helgaas45ca9e92011-10-28 16:25:35 -060051 }
52}
53EXPORT_SYMBOL(pci_free_resource_list);
54
Bjorn Helgaas2fe2abf2010-02-23 10:24:36 -070055void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
56 unsigned int flags)
57{
58 struct pci_bus_resource *bus_res;
59
60 bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
61 if (!bus_res) {
62 dev_err(&bus->dev, "can't add %pR resource\n", res);
63 return;
64 }
65
66 bus_res->res = res;
67 bus_res->flags = flags;
68 list_add_tail(&bus_res->list, &bus->resources);
69}
70
71struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
72{
73 struct pci_bus_resource *bus_res;
74
75 if (n < PCI_BRIDGE_RESOURCE_NUM)
76 return bus->resource[n];
77
78 n -= PCI_BRIDGE_RESOURCE_NUM;
79 list_for_each_entry(bus_res, &bus->resources, list) {
80 if (n-- == 0)
81 return bus_res->res;
82 }
83 return NULL;
84}
85EXPORT_SYMBOL_GPL(pci_bus_resource_n);
86
87void pci_bus_remove_resources(struct pci_bus *bus)
88{
Bjorn Helgaas2fe2abf2010-02-23 10:24:36 -070089 int i;
Yinghai Lu817a2682012-09-14 17:48:41 -070090 struct pci_bus_resource *bus_res, *tmp;
Bjorn Helgaas2fe2abf2010-02-23 10:24:36 -070091
92 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
Stephen Hemminger7736a052010-06-01 09:00:16 -070093 bus->resource[i] = NULL;
Bjorn Helgaas2fe2abf2010-02-23 10:24:36 -070094
Yinghai Lu817a2682012-09-14 17:48:41 -070095 list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
96 list_del(&bus_res->list);
97 kfree(bus_res);
98 }
Bjorn Helgaas2fe2abf2010-02-23 10:24:36 -070099}
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101/**
102 * pci_bus_alloc_resource - allocate a resource from a parent bus
103 * @bus: PCI bus
104 * @res: resource to allocate
105 * @size: size of resource to allocate
106 * @align: alignment of resource to allocate
107 * @min: minimum /proc/iomem address to allocate
108 * @type_mask: IORESOURCE_* type flags
109 * @alignf: resource alignment function
110 * @alignf_data: data argument for resource alignment function
111 *
112 * Given the PCI bus a device resides on, the size, minimum address,
113 * alignment and type, try to find an acceptable resource allocation
114 * for a specific device resource.
115 */
116int
117pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700118 resource_size_t size, resource_size_t align,
119 resource_size_t min, unsigned int type_mask,
Dominik Brodowskib26b2d42010-01-01 17:40:49 +0100120 resource_size_t (*alignf)(void *,
Dominik Brodowski3b7a17f2010-01-01 17:40:50 +0100121 const struct resource *,
Dominik Brodowskib26b2d42010-01-01 17:40:49 +0100122 resource_size_t,
123 resource_size_t),
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700124 void *alignf_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
Bjorn Helgaas6db45b72010-12-16 10:38:36 -0700126 int i, ret = -ENOMEM;
Bjorn Helgaas89a74ec2010-02-23 10:24:31 -0700127 struct resource *r;
Yinghai Lu1f82de12009-04-23 20:48:32 -0700128 resource_size_t max = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130 type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
131
Yinghai Lu1f82de12009-04-23 20:48:32 -0700132 /* don't allocate too high if the pref mem doesn't support 64bit*/
133 if (!(res->flags & IORESOURCE_MEM_64))
134 max = PCIBIOS_MAX_MEM_32;
135
Bjorn Helgaas6db45b72010-12-16 10:38:36 -0700136 pci_bus_for_each_resource(bus, r, i) {
137 if (!r)
138 continue;
139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 /* type_mask must match */
141 if ((res->flags ^ r->flags) & type_mask)
142 continue;
143
144 /* We cannot allocate a non-prefetching resource
145 from a pre-fetching area */
146 if ((r->flags & IORESOURCE_PREFETCH) &&
147 !(res->flags & IORESOURCE_PREFETCH))
148 continue;
149
150 /* Ok, try it out.. */
Linus Torvalds688d19182005-08-02 14:55:40 -0700151 ret = allocate_resource(r, res, size,
152 r->start ? : min,
Yinghai Lu1f82de12009-04-23 20:48:32 -0700153 max, align,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 alignf, alignf_data);
155 if (ret == 0)
156 break;
157 }
158 return ret;
159}
160
161/**
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800162 * pci_bus_add_device - add a single device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 * @dev: device to add
164 *
165 * This adds a single pci device to the global
166 * device list and adds sysfs and procfs entries
167 */
Sam Ravnborg96bde062007-03-26 21:53:30 -0800168int pci_bus_add_device(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169{
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700170 int retval;
Myron Stowe735bff12012-07-09 15:36:46 -0600171
Myron Stowe95df8b82012-07-13 14:29:00 -0600172 pci_fixup_device(pci_fixup_final, dev);
Matthew Garretteca0d4672012-12-05 14:33:27 -0700173
174 retval = pcibios_add_device(dev);
175 if (retval)
176 return retval;
177
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700178 retval = device_add(&dev->dev);
179 if (retval)
180 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800182 dev->is_added = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 pci_proc_attach_device(dev);
184 pci_create_sysfs_dev_files(dev);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700185 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
187
188/**
Yu Zhao876e5012008-11-22 02:42:35 +0800189 * pci_bus_add_child - add a child bus
190 * @bus: bus to add
191 *
192 * This adds sysfs entries for a single bus
193 */
194int pci_bus_add_child(struct pci_bus *bus)
195{
196 int retval;
197
198 if (bus->bridge)
199 bus->dev.parent = bus->bridge;
200
201 retval = device_register(&bus->dev);
202 if (retval)
203 return retval;
204
205 bus->is_added = 1;
206
Yu Zhao876e5012008-11-22 02:42:35 +0800207 /* Create legacy_io and legacy_mem files for this bus */
208 pci_create_legacy_files(bus);
209
210 return retval;
211}
212
213/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 * pci_bus_add_devices - insert newly discovered PCI devices
215 * @bus: bus to check for new devices
216 *
217 * Add newly discovered PCI devices (which are on the bus->devices
218 * list) to the global PCI device list, add the sysfs and procfs
219 * entries. Where a bridge is found, add the discovered bus to
220 * the parents list of child buses, and recurse (breadth-first
221 * to be compatible with 2.4)
222 *
223 * Call hotplug for each new devices.
224 */
akpm@linux-foundation.orgc48f1672009-02-03 15:45:26 -0800225void pci_bus_add_devices(const struct pci_bus *bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226{
227 struct pci_dev *dev;
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800228 struct pci_bus *child;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700229 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231 list_for_each_entry(dev, &bus->devices, bus_list) {
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800232 /* Skip already-added devices */
233 if (dev->is_added)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 continue;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700235 retval = pci_bus_add_device(dev);
236 if (retval)
237 dev_err(&dev->dev, "Error adding device, continuing\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 }
239
240 list_for_each_entry(dev, &bus->devices, bus_list) {
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800241 BUG_ON(!dev->is_added);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800243 child = dev->subordinate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 /*
245 * If there is an unattached subordinate bus, attach
246 * it and then scan for unattached PCI devices.
247 */
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800248 if (!child)
249 continue;
250 if (list_empty(&child->node)) {
251 down_write(&pci_bus_sem);
252 list_add_tail(&child->node, &dev->bus->children);
253 up_write(&pci_bus_sem);
254 }
255 pci_bus_add_devices(child);
Greg Kroah-Hartmanfd7d1ce2007-05-22 22:47:54 -0400256
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800257 /*
258 * register the bus with sysfs as the parent is now
259 * properly registered.
260 */
261 if (child->is_added)
262 continue;
Yu Zhao876e5012008-11-22 02:42:35 +0800263 retval = pci_bus_add_child(child);
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800264 if (retval)
Yu Zhao876e5012008-11-22 02:42:35 +0800265 dev_err(&dev->dev, "Error adding bus, continuing\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 }
267}
268
269void pci_enable_bridges(struct pci_bus *bus)
270{
271 struct pci_dev *dev;
Greg Kroah-Hartman95a62962005-07-28 11:37:33 -0700272 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274 list_for_each_entry(dev, &bus->devices, bus_list) {
275 if (dev->subordinate) {
Yuji Shimada296ccb02009-04-03 16:41:46 +0900276 if (!pci_is_enabled(dev)) {
Alex Chiang9dd90ca2009-03-20 14:56:20 -0600277 retval = pci_enable_device(dev);
Junchang Wang2eb5ebd2010-06-18 10:02:33 +0800278 if (retval)
279 dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval);
Alex Chiang9dd90ca2009-03-20 14:56:20 -0600280 pci_set_master(dev);
281 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 pci_enable_bridges(dev->subordinate);
283 }
284 }
285}
286
Paul Mackerrascecf4862005-08-18 14:33:01 +1000287/** pci_walk_bus - walk devices on/under bus, calling callback.
288 * @top bus whose devices should be walked
289 * @cb callback to be called for each device found
290 * @userdata arbitrary pointer to be passed to callback.
291 *
292 * Walk the given bus, including any bridged devices
293 * on buses under this bus. Call the provided callback
294 * on each device found.
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800295 *
296 * We check the return of @cb each time. If it returns anything
297 * other than 0, we break out.
298 *
Paul Mackerrascecf4862005-08-18 14:33:01 +1000299 */
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800300void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
Paul Mackerrascecf4862005-08-18 14:33:01 +1000301 void *userdata)
302{
303 struct pci_dev *dev;
304 struct pci_bus *bus;
305 struct list_head *next;
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800306 int retval;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000307
308 bus = top;
Zhang Yanmind71374d2006-06-02 12:35:43 +0800309 down_read(&pci_bus_sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000310 next = top->devices.next;
311 for (;;) {
312 if (next == &bus->devices) {
313 /* end of this bus, go up or finish */
314 if (bus == top)
315 break;
316 next = bus->self->bus_list.next;
317 bus = bus->self->bus;
318 continue;
319 }
320 dev = list_entry(next, struct pci_dev, bus_list);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000321 if (dev->subordinate) {
322 /* this is a pci-pci bridge, do its devices next */
323 next = dev->subordinate->devices.next;
324 bus = dev->subordinate;
325 } else
326 next = dev->bus_list.next;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000327
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800328 retval = cb(dev, userdata);
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800329 if (retval)
330 break;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000331 }
Zhang Yanmind71374d2006-06-02 12:35:43 +0800332 up_read(&pci_bus_sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000333}
Konrad Rzeszutek Wilk7c94def2009-12-22 14:49:45 -0500334EXPORT_SYMBOL_GPL(pci_walk_bus);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000335
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336EXPORT_SYMBOL(pci_bus_alloc_resource);
337EXPORT_SYMBOL_GPL(pci_bus_add_device);
338EXPORT_SYMBOL(pci_bus_add_devices);
339EXPORT_SYMBOL(pci_enable_bridges);