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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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