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>
20 void pci_bus_add_resource(struct pci_bus
*bus
, struct resource
*res
,
23 struct pci_bus_resource
*bus_res
;
25 bus_res
= kzalloc(sizeof(struct pci_bus_resource
), GFP_KERNEL
);
27 dev_err(&bus
->dev
, "can't add %pR resource\n", res
);
32 bus_res
->flags
= flags
;
33 list_add_tail(&bus_res
->list
, &bus
->resources
);
36 struct resource
*pci_bus_resource_n(const struct pci_bus
*bus
, int n
)
38 struct pci_bus_resource
*bus_res
;
40 if (n
< PCI_BRIDGE_RESOURCE_NUM
)
41 return bus
->resource
[n
];
43 n
-= PCI_BRIDGE_RESOURCE_NUM
;
44 list_for_each_entry(bus_res
, &bus
->resources
, list
) {
50 EXPORT_SYMBOL_GPL(pci_bus_resource_n
);
52 void pci_bus_remove_resources(struct pci_bus
*bus
)
54 struct pci_bus_resource
*bus_res
, *tmp
;
57 for (i
= 0; i
< PCI_BRIDGE_RESOURCE_NUM
; i
++)
60 list_for_each_entry_safe(bus_res
, tmp
, &bus
->resources
, list
) {
61 list_del(&bus_res
->list
);
67 * pci_bus_alloc_resource - allocate a resource from a parent bus
69 * @res: resource to allocate
70 * @size: size of resource to allocate
71 * @align: alignment of resource to allocate
72 * @min: minimum /proc/iomem address to allocate
73 * @type_mask: IORESOURCE_* type flags
74 * @alignf: resource alignment function
75 * @alignf_data: data argument for resource alignment function
77 * Given the PCI bus a device resides on, the size, minimum address,
78 * alignment and type, try to find an acceptable resource allocation
79 * for a specific device resource.
82 pci_bus_alloc_resource(struct pci_bus
*bus
, struct resource
*res
,
83 resource_size_t size
, resource_size_t align
,
84 resource_size_t min
, unsigned int type_mask
,
85 resource_size_t (*alignf
)(void *,
86 const struct resource
*,
93 resource_size_t max
= -1;
95 type_mask
|= IORESOURCE_IO
| IORESOURCE_MEM
;
97 /* don't allocate too high if the pref mem doesn't support 64bit*/
98 if (!(res
->flags
& IORESOURCE_MEM_64
))
99 max
= PCIBIOS_MAX_MEM_32
;
101 pci_bus_for_each_resource(bus
, r
, i
) {
105 /* type_mask must match */
106 if ((res
->flags
^ r
->flags
) & type_mask
)
109 /* We cannot allocate a non-prefetching resource
110 from a pre-fetching area */
111 if ((r
->flags
& IORESOURCE_PREFETCH
) &&
112 !(res
->flags
& IORESOURCE_PREFETCH
))
115 /* Ok, try it out.. */
116 ret
= allocate_resource(r
, res
, size
,
119 alignf
, alignf_data
);
127 * pci_bus_add_device - add a single device
128 * @dev: device to add
130 * This adds a single pci device to the global
131 * device list and adds sysfs and procfs entries
133 int pci_bus_add_device(struct pci_dev
*dev
)
136 retval
= device_add(&dev
->dev
);
141 pci_proc_attach_device(dev
);
142 pci_create_sysfs_dev_files(dev
);
147 * pci_bus_add_child - add a child bus
150 * This adds sysfs entries for a single bus
152 int pci_bus_add_child(struct pci_bus
*bus
)
157 bus
->dev
.parent
= bus
->bridge
;
159 retval
= device_register(&bus
->dev
);
165 retval
= device_create_file(&bus
->dev
, &dev_attr_cpuaffinity
);
169 retval
= device_create_file(&bus
->dev
, &dev_attr_cpulistaffinity
);
171 /* Create legacy_io and legacy_mem files for this bus */
172 pci_create_legacy_files(bus
);
178 * pci_bus_add_devices - insert newly discovered PCI devices
179 * @bus: bus to check for new devices
181 * Add newly discovered PCI devices (which are on the bus->devices
182 * list) to the global PCI device list, add the sysfs and procfs
183 * entries. Where a bridge is found, add the discovered bus to
184 * the parents list of child buses, and recurse (breadth-first
185 * to be compatible with 2.4)
187 * Call hotplug for each new devices.
189 void pci_bus_add_devices(const struct pci_bus
*bus
)
192 struct pci_bus
*child
;
195 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
196 /* Skip already-added devices */
199 retval
= pci_bus_add_device(dev
);
201 dev_err(&dev
->dev
, "Error adding device, continuing\n");
204 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
205 BUG_ON(!dev
->is_added
);
207 child
= dev
->subordinate
;
209 * If there is an unattached subordinate bus, attach
210 * it and then scan for unattached PCI devices.
214 if (list_empty(&child
->node
)) {
215 down_write(&pci_bus_sem
);
216 list_add_tail(&child
->node
, &dev
->bus
->children
);
217 up_write(&pci_bus_sem
);
219 pci_bus_add_devices(child
);
222 * register the bus with sysfs as the parent is now
223 * properly registered.
227 retval
= pci_bus_add_child(child
);
229 dev_err(&dev
->dev
, "Error adding bus, continuing\n");
233 void pci_enable_bridges(struct pci_bus
*bus
)
238 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
239 if (dev
->subordinate
) {
240 if (!pci_is_enabled(dev
)) {
241 retval
= pci_enable_device(dev
);
244 pci_enable_bridges(dev
->subordinate
);
249 /** pci_walk_bus - walk devices on/under bus, calling callback.
250 * @top bus whose devices should be walked
251 * @cb callback to be called for each device found
252 * @userdata arbitrary pointer to be passed to callback.
254 * Walk the given bus, including any bridged devices
255 * on buses under this bus. Call the provided callback
256 * on each device found.
258 * We check the return of @cb each time. If it returns anything
259 * other than 0, we break out.
262 void pci_walk_bus(struct pci_bus
*top
, int (*cb
)(struct pci_dev
*, void *),
267 struct list_head
*next
;
271 down_read(&pci_bus_sem
);
272 next
= top
->devices
.next
;
274 if (next
== &bus
->devices
) {
275 /* end of this bus, go up or finish */
278 next
= bus
->self
->bus_list
.next
;
279 bus
= bus
->self
->bus
;
282 dev
= list_entry(next
, struct pci_dev
, bus_list
);
283 if (dev
->subordinate
) {
284 /* this is a pci-pci bridge, do its devices next */
285 next
= dev
->subordinate
->devices
.next
;
286 bus
= dev
->subordinate
;
288 next
= dev
->bus_list
.next
;
290 /* Run device routines with the device locked */
291 device_lock(&dev
->dev
);
292 retval
= cb(dev
, userdata
);
293 device_unlock(&dev
->dev
);
297 up_read(&pci_bus_sem
);
300 EXPORT_SYMBOL(pci_bus_alloc_resource
);
301 EXPORT_SYMBOL_GPL(pci_bus_add_device
);
302 EXPORT_SYMBOL(pci_bus_add_devices
);
303 EXPORT_SYMBOL(pci_enable_bridges
);