]>
Commit | Line | Data |
---|---|---|
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 | |
8a1bc901 | 87 | dev->is_added = 1; |
1da177e4 LT |
88 | pci_proc_attach_device(dev); |
89 | pci_create_sysfs_dev_files(dev); | |
b19441af | 90 | return 0; |
1da177e4 LT |
91 | } |
92 | ||
93 | /** | |
94 | * pci_bus_add_devices - insert newly discovered PCI devices | |
95 | * @bus: bus to check for new devices | |
96 | * | |
97 | * Add newly discovered PCI devices (which are on the bus->devices | |
98 | * list) to the global PCI device list, add the sysfs and procfs | |
99 | * entries. Where a bridge is found, add the discovered bus to | |
100 | * the parents list of child buses, and recurse (breadth-first | |
101 | * to be compatible with 2.4) | |
102 | * | |
103 | * Call hotplug for each new devices. | |
104 | */ | |
96bde06a | 105 | void pci_bus_add_devices(struct pci_bus *bus) |
1da177e4 LT |
106 | { |
107 | struct pci_dev *dev; | |
fd7d1ced | 108 | struct pci_bus *child_bus; |
b19441af | 109 | int retval; |
1da177e4 LT |
110 | |
111 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
8a1bc901 GKH |
112 | /* Skip already-added devices */ |
113 | if (dev->is_added) | |
1da177e4 | 114 | continue; |
b19441af GKH |
115 | retval = pci_bus_add_device(dev); |
116 | if (retval) | |
117 | dev_err(&dev->dev, "Error adding device, continuing\n"); | |
1da177e4 LT |
118 | } |
119 | ||
120 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
8a1bc901 | 121 | BUG_ON(!dev->is_added); |
1da177e4 LT |
122 | |
123 | /* | |
124 | * If there is an unattached subordinate bus, attach | |
125 | * it and then scan for unattached PCI devices. | |
126 | */ | |
6ef6f0e3 RS |
127 | if (dev->subordinate) { |
128 | if (list_empty(&dev->subordinate->node)) { | |
d71374da | 129 | down_write(&pci_bus_sem); |
6ef6f0e3 RS |
130 | list_add_tail(&dev->subordinate->node, |
131 | &dev->bus->children); | |
d71374da | 132 | up_write(&pci_bus_sem); |
b19441af | 133 | } |
1da177e4 | 134 | pci_bus_add_devices(dev->subordinate); |
fd7d1ced GKH |
135 | |
136 | /* register the bus with sysfs as the parent is now | |
137 | * properly registered. */ | |
138 | child_bus = dev->subordinate; | |
cc74d96f GKH |
139 | if (child_bus->is_added) |
140 | continue; | |
fd7d1ced GKH |
141 | child_bus->dev.parent = child_bus->bridge; |
142 | retval = device_register(&child_bus->dev); | |
4725e7bd GKH |
143 | if (retval) |
144 | dev_err(&dev->dev, "Error registering pci_bus," | |
145 | " continuing...\n"); | |
cc74d96f GKH |
146 | else { |
147 | child_bus->is_added = 1; | |
fd7d1ced GKH |
148 | retval = device_create_file(&child_bus->dev, |
149 | &dev_attr_cpuaffinity); | |
cc74d96f | 150 | } |
b19441af | 151 | if (retval) |
4725e7bd GKH |
152 | dev_err(&dev->dev, "Error creating cpuaffinity" |
153 | " file, continuing...\n"); | |
1da177e4 LT |
154 | } |
155 | } | |
156 | } | |
157 | ||
158 | void pci_enable_bridges(struct pci_bus *bus) | |
159 | { | |
160 | struct pci_dev *dev; | |
95a62965 | 161 | int retval; |
1da177e4 LT |
162 | |
163 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
164 | if (dev->subordinate) { | |
95a62965 | 165 | retval = pci_enable_device(dev); |
1da177e4 LT |
166 | pci_set_master(dev); |
167 | pci_enable_bridges(dev->subordinate); | |
168 | } | |
169 | } | |
170 | } | |
171 | ||
cecf4864 PM |
172 | /** pci_walk_bus - walk devices on/under bus, calling callback. |
173 | * @top bus whose devices should be walked | |
174 | * @cb callback to be called for each device found | |
175 | * @userdata arbitrary pointer to be passed to callback. | |
176 | * | |
177 | * Walk the given bus, including any bridged devices | |
178 | * on buses under this bus. Call the provided callback | |
179 | * on each device found. | |
180 | */ | |
181 | void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *), | |
182 | void *userdata) | |
183 | { | |
184 | struct pci_dev *dev; | |
185 | struct pci_bus *bus; | |
186 | struct list_head *next; | |
187 | ||
188 | bus = top; | |
d71374da | 189 | down_read(&pci_bus_sem); |
cecf4864 PM |
190 | next = top->devices.next; |
191 | for (;;) { | |
192 | if (next == &bus->devices) { | |
193 | /* end of this bus, go up or finish */ | |
194 | if (bus == top) | |
195 | break; | |
196 | next = bus->self->bus_list.next; | |
197 | bus = bus->self->bus; | |
198 | continue; | |
199 | } | |
200 | dev = list_entry(next, struct pci_dev, bus_list); | |
cecf4864 PM |
201 | if (dev->subordinate) { |
202 | /* this is a pci-pci bridge, do its devices next */ | |
203 | next = dev->subordinate->devices.next; | |
204 | bus = dev->subordinate; | |
205 | } else | |
206 | next = dev->bus_list.next; | |
cecf4864 | 207 | |
d71374da ZY |
208 | /* Run device routines with the device locked */ |
209 | down(&dev->dev.sem); | |
cecf4864 | 210 | cb(dev, userdata); |
d71374da | 211 | up(&dev->dev.sem); |
cecf4864 | 212 | } |
d71374da | 213 | up_read(&pci_bus_sem); |
cecf4864 | 214 | } |
cecf4864 | 215 | |
1da177e4 LT |
216 | EXPORT_SYMBOL(pci_bus_alloc_resource); |
217 | EXPORT_SYMBOL_GPL(pci_bus_add_device); | |
218 | EXPORT_SYMBOL(pci_bus_add_devices); | |
219 | EXPORT_SYMBOL(pci_enable_bridges); |