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)
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 #include <linux/slab.h>
21 void pci_bus_add_resource(struct pci_bus
*bus
, struct resource
*res
,
24 struct pci_bus_resource
*bus_res
;
26 bus_res
= kzalloc(sizeof(struct pci_bus_resource
), GFP_KERNEL
);
28 dev_err(&bus
->dev
, "can't add %pR resource\n", res
);
33 bus_res
->flags
= flags
;
34 list_add_tail(&bus_res
->list
, &bus
->resources
);
37 struct resource
*pci_bus_resource_n(const struct pci_bus
*bus
, int n
)
39 struct pci_bus_resource
*bus_res
;
41 if (n
< PCI_BRIDGE_RESOURCE_NUM
)
42 return bus
->resource
[n
];
44 n
-= PCI_BRIDGE_RESOURCE_NUM
;
45 list_for_each_entry(bus_res
, &bus
->resources
, list
) {
51 EXPORT_SYMBOL_GPL(pci_bus_resource_n
);
53 void pci_bus_remove_resources(struct pci_bus
*bus
)
55 struct pci_bus_resource
*bus_res
, *tmp
;
58 for (i
= 0; i
< PCI_BRIDGE_RESOURCE_NUM
; i
++)
59 bus
->resource
[i
] = NULL
;
61 list_for_each_entry_safe(bus_res
, tmp
, &bus
->resources
, list
) {
62 list_del(&bus_res
->list
);
68 * pci_bus_alloc_resource - allocate a resource from a parent bus
70 * @res: resource to allocate
71 * @size: size of resource to allocate
72 * @align: alignment of resource to allocate
73 * @min: minimum /proc/iomem address to allocate
74 * @type_mask: IORESOURCE_* type flags
75 * @alignf: resource alignment function
76 * @alignf_data: data argument for resource alignment function
78 * Given the PCI bus a device resides on, the size, minimum address,
79 * alignment and type, try to find an acceptable resource allocation
80 * for a specific device resource.
83 pci_bus_alloc_resource(struct pci_bus
*bus
, struct resource
*res
,
84 resource_size_t size
, resource_size_t align
,
85 resource_size_t min
, unsigned int type_mask
,
86 resource_size_t (*alignf
)(void *,
87 const struct resource
*,
94 resource_size_t max
= -1;
96 type_mask
|= IORESOURCE_IO
| IORESOURCE_MEM
;
98 /* don't allocate too high if the pref mem doesn't support 64bit*/
99 if (!(res
->flags
& IORESOURCE_MEM_64
))
100 max
= PCIBIOS_MAX_MEM_32
;
102 pci_bus_for_each_resource(bus
, r
, i
) {
106 /* type_mask must match */
107 if ((res
->flags
^ r
->flags
) & type_mask
)
110 /* We cannot allocate a non-prefetching resource
111 from a pre-fetching area */
112 if ((r
->flags
& IORESOURCE_PREFETCH
) &&
113 !(res
->flags
& IORESOURCE_PREFETCH
))
116 /* Ok, try it out.. */
117 ret
= allocate_resource(r
, res
, size
,
120 alignf
, alignf_data
);
128 * pci_bus_add_device - add a single device
129 * @dev: device to add
131 * This adds a single pci device to the global
132 * device list and adds sysfs and procfs entries
134 int pci_bus_add_device(struct pci_dev
*dev
)
137 retval
= device_add(&dev
->dev
);
142 pci_proc_attach_device(dev
);
143 pci_create_sysfs_dev_files(dev
);
148 * pci_bus_add_child - add a child bus
151 * This adds sysfs entries for a single bus
153 int pci_bus_add_child(struct pci_bus
*bus
)
158 bus
->dev
.parent
= bus
->bridge
;
160 retval
= device_register(&bus
->dev
);
166 /* Create legacy_io and legacy_mem files for this bus */
167 pci_create_legacy_files(bus
);
173 * pci_bus_add_devices - insert newly discovered PCI devices
174 * @bus: bus to check for new devices
176 * Add newly discovered PCI devices (which are on the bus->devices
177 * list) to the global PCI device list, add the sysfs and procfs
178 * entries. Where a bridge is found, add the discovered bus to
179 * the parents list of child buses, and recurse (breadth-first
180 * to be compatible with 2.4)
182 * Call hotplug for each new devices.
184 void pci_bus_add_devices(const struct pci_bus
*bus
)
187 struct pci_bus
*child
;
190 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
191 /* Skip already-added devices */
194 retval
= pci_bus_add_device(dev
);
196 dev_err(&dev
->dev
, "Error adding device, continuing\n");
199 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
200 BUG_ON(!dev
->is_added
);
202 child
= dev
->subordinate
;
204 * If there is an unattached subordinate bus, attach
205 * it and then scan for unattached PCI devices.
209 if (list_empty(&child
->node
)) {
210 down_write(&pci_bus_sem
);
211 list_add_tail(&child
->node
, &dev
->bus
->children
);
212 up_write(&pci_bus_sem
);
214 pci_bus_add_devices(child
);
217 * register the bus with sysfs as the parent is now
218 * properly registered.
222 retval
= pci_bus_add_child(child
);
224 dev_err(&dev
->dev
, "Error adding bus, continuing\n");
228 void pci_enable_bridges(struct pci_bus
*bus
)
233 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
234 if (dev
->subordinate
) {
235 if (!pci_is_enabled(dev
)) {
236 retval
= pci_enable_device(dev
);
238 dev_err(&dev
->dev
, "Error enabling bridge (%d), continuing\n", retval
);
241 pci_enable_bridges(dev
->subordinate
);
246 /** pci_walk_bus - walk devices on/under bus, calling callback.
247 * @top bus whose devices should be walked
248 * @cb callback to be called for each device found
249 * @userdata arbitrary pointer to be passed to callback.
251 * Walk the given bus, including any bridged devices
252 * on buses under this bus. Call the provided callback
253 * on each device found.
255 * We check the return of @cb each time. If it returns anything
256 * other than 0, we break out.
259 void pci_walk_bus(struct pci_bus
*top
, int (*cb
)(struct pci_dev
*, void *),
264 struct list_head
*next
;
268 down_read(&pci_bus_sem
);
269 next
= top
->devices
.next
;
271 if (next
== &bus
->devices
) {
272 /* end of this bus, go up or finish */
275 next
= bus
->self
->bus_list
.next
;
276 bus
= bus
->self
->bus
;
279 dev
= list_entry(next
, struct pci_dev
, bus_list
);
280 if (dev
->subordinate
) {
281 /* this is a pci-pci bridge, do its devices next */
282 next
= dev
->subordinate
->devices
.next
;
283 bus
= dev
->subordinate
;
285 next
= dev
->bus_list
.next
;
287 /* Run device routines with the device locked */
288 device_lock(&dev
->dev
);
289 retval
= cb(dev
, userdata
);
290 device_unlock(&dev
->dev
);
294 up_read(&pci_bus_sem
);
296 EXPORT_SYMBOL_GPL(pci_walk_bus
);
298 EXPORT_SYMBOL(pci_bus_alloc_resource
);
299 EXPORT_SYMBOL_GPL(pci_bus_add_device
);
300 EXPORT_SYMBOL(pci_bus_add_devices
);
301 EXPORT_SYMBOL(pci_enable_bridges
);
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