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++)
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 retval = device_create_file(&bus->dev, &dev_attr_cpuaffinity);
170 retval = device_create_file(&bus->dev, &dev_attr_cpulistaffinity);
172 /* Create legacy_io and legacy_mem files for this bus */
173 pci_create_legacy_files(bus);
179 * pci_bus_add_devices - insert newly discovered PCI devices
180 * @bus: bus to check for new devices
182 * Add newly discovered PCI devices (which are on the bus->devices
183 * list) to the global PCI device list, add the sysfs and procfs
184 * entries. Where a bridge is found, add the discovered bus to
185 * the parents list of child buses, and recurse (breadth-first
186 * to be compatible with 2.4)
188 * Call hotplug for each new devices.
190 void pci_bus_add_devices(const struct pci_bus *bus)
193 struct pci_bus *child;
196 list_for_each_entry(dev, &bus->devices, bus_list) {
197 /* Skip already-added devices */
200 retval = pci_bus_add_device(dev);
202 dev_err(&dev->dev, "Error adding device, continuing\n");
205 list_for_each_entry(dev, &bus->devices, bus_list) {
206 BUG_ON(!dev->is_added);
208 child = dev->subordinate;
210 * If there is an unattached subordinate bus, attach
211 * it and then scan for unattached PCI devices.
215 if (list_empty(&child->node)) {
216 down_write(&pci_bus_sem);
217 list_add_tail(&child->node, &dev->bus->children);
218 up_write(&pci_bus_sem);
220 pci_bus_add_devices(child);
223 * register the bus with sysfs as the parent is now
224 * properly registered.
228 retval = pci_bus_add_child(child);
230 dev_err(&dev->dev, "Error adding bus, continuing\n");
234 void pci_enable_bridges(struct pci_bus *bus)
239 list_for_each_entry(dev, &bus->devices, bus_list) {
240 if (dev->subordinate) {
241 if (!pci_is_enabled(dev)) {
242 retval = pci_enable_device(dev);
245 pci_enable_bridges(dev->subordinate);
250 /** pci_walk_bus - walk devices on/under bus, calling callback.
251 * @top bus whose devices should be walked
252 * @cb callback to be called for each device found
253 * @userdata arbitrary pointer to be passed to callback.
255 * Walk the given bus, including any bridged devices
256 * on buses under this bus. Call the provided callback
257 * on each device found.
259 * We check the return of @cb each time. If it returns anything
260 * other than 0, we break out.
263 void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
268 struct list_head *next;
272 down_read(&pci_bus_sem);
273 next = top->devices.next;
275 if (next == &bus->devices) {
276 /* end of this bus, go up or finish */
279 next = bus->self->bus_list.next;
280 bus = bus->self->bus;
283 dev = list_entry(next, struct pci_dev, bus_list);
284 if (dev->subordinate) {
285 /* this is a pci-pci bridge, do its devices next */
286 next = dev->subordinate->devices.next;
287 bus = dev->subordinate;
289 next = dev->bus_list.next;
291 /* Run device routines with the device locked */
292 device_lock(&dev->dev);
293 retval = cb(dev, userdata);
294 device_unlock(&dev->dev);
298 up_read(&pci_bus_sem);
301 EXPORT_SYMBOL(pci_bus_alloc_resource);
302 EXPORT_SYMBOL_GPL(pci_bus_add_device);
303 EXPORT_SYMBOL(pci_bus_add_devices);
304 EXPORT_SYMBOL(pci_enable_bridges);