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1da177e4 LT |
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, | |
e31dd6e4 GKH |
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) | |
1da177e4 LT |
42 | { |
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.. */ | |
688d1918 LT |
63 | ret = allocate_resource(r, res, size, |
64 | r->start ? : min, | |
65 | -1, align, | |
1da177e4 LT |
66 | alignf, alignf_data); |
67 | if (ret == 0) | |
68 | break; | |
69 | } | |
70 | return ret; | |
71 | } | |
72 | ||
73 | /** | |
74 | * add a single device | |
75 | * @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 | */ | |
96bde06a | 80 | int pci_bus_add_device(struct pci_dev *dev) |
1da177e4 | 81 | { |
b19441af GKH |
82 | int retval; |
83 | retval = device_add(&dev->dev); | |
84 | if (retval) | |
85 | return retval; | |
1da177e4 | 86 | |
d71374da | 87 | down_write(&pci_bus_sem); |
1da177e4 | 88 | list_add_tail(&dev->global_list, &pci_devices); |
d71374da | 89 | up_write(&pci_bus_sem); |
1da177e4 LT |
90 | |
91 | pci_proc_attach_device(dev); | |
92 | pci_create_sysfs_dev_files(dev); | |
b19441af | 93 | return 0; |
1da177e4 LT |
94 | } |
95 | ||
96 | /** | |
97 | * pci_bus_add_devices - insert newly discovered PCI devices | |
98 | * @bus: bus to check for new devices | |
99 | * | |
100 | * Add newly discovered PCI devices (which are on the bus->devices | |
101 | * list) to the global PCI device list, add the sysfs and procfs | |
102 | * entries. Where a bridge is found, add the discovered bus to | |
103 | * the parents list of child buses, and recurse (breadth-first | |
104 | * to be compatible with 2.4) | |
105 | * | |
106 | * Call hotplug for each new devices. | |
107 | */ | |
96bde06a | 108 | void pci_bus_add_devices(struct pci_bus *bus) |
1da177e4 LT |
109 | { |
110 | struct pci_dev *dev; | |
b19441af | 111 | int retval; |
1da177e4 LT |
112 | |
113 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
114 | /* | |
115 | * Skip already-present devices (which are on the | |
116 | * global device list.) | |
117 | */ | |
118 | if (!list_empty(&dev->global_list)) | |
119 | continue; | |
b19441af GKH |
120 | retval = pci_bus_add_device(dev); |
121 | if (retval) | |
122 | dev_err(&dev->dev, "Error adding device, continuing\n"); | |
1da177e4 LT |
123 | } |
124 | ||
125 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
126 | ||
127 | BUG_ON(list_empty(&dev->global_list)); | |
128 | ||
129 | /* | |
130 | * If there is an unattached subordinate bus, attach | |
131 | * it and then scan for unattached PCI devices. | |
132 | */ | |
6ef6f0e3 RS |
133 | if (dev->subordinate) { |
134 | if (list_empty(&dev->subordinate->node)) { | |
d71374da | 135 | down_write(&pci_bus_sem); |
6ef6f0e3 RS |
136 | list_add_tail(&dev->subordinate->node, |
137 | &dev->bus->children); | |
d71374da | 138 | up_write(&pci_bus_sem); |
b19441af | 139 | } |
1da177e4 | 140 | pci_bus_add_devices(dev->subordinate); |
b19441af GKH |
141 | retval = sysfs_create_link(&dev->subordinate->class_dev.kobj, |
142 | &dev->dev.kobj, "bridge"); | |
143 | if (retval) | |
144 | dev_err(&dev->dev, "Error creating sysfs " | |
145 | "bridge symlink, continuing...\n"); | |
1da177e4 LT |
146 | } |
147 | } | |
148 | } | |
149 | ||
150 | void pci_enable_bridges(struct pci_bus *bus) | |
151 | { | |
152 | struct pci_dev *dev; | |
95a62965 | 153 | int retval; |
1da177e4 LT |
154 | |
155 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
156 | if (dev->subordinate) { | |
95a62965 | 157 | retval = pci_enable_device(dev); |
1da177e4 LT |
158 | pci_set_master(dev); |
159 | pci_enable_bridges(dev->subordinate); | |
160 | } | |
161 | } | |
162 | } | |
163 | ||
cecf4864 PM |
164 | /** pci_walk_bus - walk devices on/under bus, calling callback. |
165 | * @top bus whose devices should be walked | |
166 | * @cb callback to be called for each device found | |
167 | * @userdata arbitrary pointer to be passed to callback. | |
168 | * | |
169 | * Walk the given bus, including any bridged devices | |
170 | * on buses under this bus. Call the provided callback | |
171 | * on each device found. | |
172 | */ | |
173 | void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *), | |
174 | void *userdata) | |
175 | { | |
176 | struct pci_dev *dev; | |
177 | struct pci_bus *bus; | |
178 | struct list_head *next; | |
179 | ||
180 | bus = top; | |
d71374da | 181 | down_read(&pci_bus_sem); |
cecf4864 PM |
182 | next = top->devices.next; |
183 | for (;;) { | |
184 | if (next == &bus->devices) { | |
185 | /* end of this bus, go up or finish */ | |
186 | if (bus == top) | |
187 | break; | |
188 | next = bus->self->bus_list.next; | |
189 | bus = bus->self->bus; | |
190 | continue; | |
191 | } | |
192 | dev = list_entry(next, struct pci_dev, bus_list); | |
cecf4864 PM |
193 | if (dev->subordinate) { |
194 | /* this is a pci-pci bridge, do its devices next */ | |
195 | next = dev->subordinate->devices.next; | |
196 | bus = dev->subordinate; | |
197 | } else | |
198 | next = dev->bus_list.next; | |
cecf4864 | 199 | |
d71374da ZY |
200 | /* Run device routines with the device locked */ |
201 | down(&dev->dev.sem); | |
cecf4864 | 202 | cb(dev, userdata); |
d71374da | 203 | up(&dev->dev.sem); |
cecf4864 | 204 | } |
d71374da | 205 | up_read(&pci_bus_sem); |
cecf4864 PM |
206 | } |
207 | EXPORT_SYMBOL_GPL(pci_walk_bus); | |
208 | ||
1da177e4 LT |
209 | EXPORT_SYMBOL(pci_bus_alloc_resource); |
210 | EXPORT_SYMBOL_GPL(pci_bus_add_device); | |
211 | EXPORT_SYMBOL(pci_bus_add_devices); | |
212 | EXPORT_SYMBOL(pci_enable_bridges); |