1 /*
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 */
35 int
36 pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
37 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)
42 {
43 int i, ret = -ENOMEM;
44 resource_size_t max = -1;
45
46 type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
47
48 /* don't allocate too high if the pref mem doesn't support 64bit*/
49 if (!(res->flags & IORESOURCE_MEM_64))
50 max = PCIBIOS_MAX_MEM_32;
51
52 for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
53 struct resource *r = bus->resource[i];
54 if (!r)
55 continue;
56
57 /* type_mask must match */
58 if ((res->flags ^ r->flags) & type_mask)
59 continue;
60
61 /* We cannot allocate a non-prefetching resource
62 from a pre-fetching area */
63 if ((r->flags & IORESOURCE_PREFETCH) &&
64 !(res->flags & IORESOURCE_PREFETCH))
65 continue;
66
67 /* Ok, try it out.. */
68 ret = allocate_resource(r, res, size,
69 r->start ? : min,
70 max, align,
71 alignf, alignf_data);
72 if (ret == 0)
73 break;
74 }
75 return ret;
76 }
77
78 /**
79 * pci_bus_add_device - add a single device
80 * @dev: device to add
81 *
82 * This adds a single pci device to the global
83 * device list and adds sysfs and procfs entries
84 */
85 int pci_bus_add_device(struct pci_dev *dev)
86 {
87 int retval;
88 retval = device_add(&dev->dev);
89 if (retval)
90 return retval;
91
92 dev->is_added = 1;
93 pci_proc_attach_device(dev);
94 pci_create_sysfs_dev_files(dev);
95 return 0;
96 }
97
98 /**
99 * pci_bus_add_child - add a child bus
100 * @bus: bus to add
101 *
102 * This adds sysfs entries for a single bus
103 */
104 int pci_bus_add_child(struct pci_bus *bus)
105 {
106 int retval;
107
108 if (bus->bridge)
109 bus->dev.parent = bus->bridge;
110
111 retval = device_register(&bus->dev);
112 if (retval)
113 return retval;
114
115 bus->is_added = 1;
116
117 retval = device_create_file(&bus->dev, &dev_attr_cpuaffinity);
118 if (retval)
119 return retval;
120
121 retval = device_create_file(&bus->dev, &dev_attr_cpulistaffinity);
122
123 /* Create legacy_io and legacy_mem files for this bus */
124 pci_create_legacy_files(bus);
125
126 return retval;
127 }
128
129 /**
130 * pci_bus_add_devices - insert newly discovered PCI devices
131 * @bus: bus to check for new devices
132 *
133 * Add newly discovered PCI devices (which are on the bus->devices
134 * list) to the global PCI device list, add the sysfs and procfs
135 * entries. Where a bridge is found, add the discovered bus to
136 * the parents list of child buses, and recurse (breadth-first
137 * to be compatible with 2.4)
138 *
139 * Call hotplug for each new devices.
140 */
141 void pci_bus_add_devices(const struct pci_bus *bus)
142 {
143 struct pci_dev *dev;
144 struct pci_bus *child;
145 int retval;
146
147 list_for_each_entry(dev, &bus->devices, bus_list) {
148 /* Skip already-added devices */
149 if (dev->is_added)
150 continue;
151 retval = pci_bus_add_device(dev);
152 if (retval)
153 dev_err(&dev->dev, "Error adding device, continuing\n");
154 }
155
156 list_for_each_entry(dev, &bus->devices, bus_list) {
157 BUG_ON(!dev->is_added);
158
159 child = dev->subordinate;
160 /*
161 * If there is an unattached subordinate bus, attach
162 * it and then scan for unattached PCI devices.
163 */
164 if (!child)
165 continue;
166 if (list_empty(&child->node)) {
167 down_write(&pci_bus_sem);
168 list_add_tail(&child->node, &dev->bus->children);
169 up_write(&pci_bus_sem);
170 }
171 pci_bus_add_devices(child);
172
173 /*
174 * register the bus with sysfs as the parent is now
175 * properly registered.
176 */
177 if (child->is_added)
178 continue;
179 retval = pci_bus_add_child(child);
180 if (retval)
181 dev_err(&dev->dev, "Error adding bus, continuing\n");
182 }
183 }
184
185 void pci_enable_bridges(struct pci_bus *bus)
186 {
187 struct pci_dev *dev;
188 int retval;
189
190 list_for_each_entry(dev, &bus->devices, bus_list) {
191 if (dev->subordinate) {
192 if (!pci_is_enabled(dev)) {
193 retval = pci_enable_device(dev);
194 pci_set_master(dev);
195 }
196 pci_enable_bridges(dev->subordinate);
197 }
198 }
199 }
200
201 /** pci_walk_bus - walk devices on/under bus, calling callback.
202 * @top bus whose devices should be walked
203 * @cb callback to be called for each device found
204 * @userdata arbitrary pointer to be passed to callback.
205 *
206 * Walk the given bus, including any bridged devices
207 * on buses under this bus. Call the provided callback
208 * on each device found.
209 *
210 * We check the return of @cb each time. If it returns anything
211 * other than 0, we break out.
212 *
213 */
214 void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
215 void *userdata)
216 {
217 struct pci_dev *dev;
218 struct pci_bus *bus;
219 struct list_head *next;
220 int retval;
221
222 bus = top;
223 down_read(&pci_bus_sem);
224 next = top->devices.next;
225 for (;;) {
226 if (next == &bus->devices) {
227 /* end of this bus, go up or finish */
228 if (bus == top)
229 break;
230 next = bus->self->bus_list.next;
231 bus = bus->self->bus;
232 continue;
233 }
234 dev = list_entry(next, struct pci_dev, bus_list);
235 if (dev->subordinate) {
236 /* this is a pci-pci bridge, do its devices next */
237 next = dev->subordinate->devices.next;
238 bus = dev->subordinate;
239 } else
240 next = dev->bus_list.next;
241
242 /* Run device routines with the device locked */
243 down(&dev->dev.sem);
244 retval = cb(dev, userdata);
245 up(&dev->dev.sem);
246 if (retval)
247 break;
248 }
249 up_read(&pci_bus_sem);
250 }
251
252 EXPORT_SYMBOL(pci_bus_alloc_resource);
253 EXPORT_SYMBOL_GPL(pci_bus_add_device);
254 EXPORT_SYMBOL(pci_bus_add_devices);
255 EXPORT_SYMBOL(pci_enable_bridges);
256
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