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>
21 * pci_bus_alloc_resource - allocate a resource from a parent 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
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.
36 pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
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,
45 type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
47 for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
48 struct resource *r = bus->resource[i];
52 /* type_mask must match */
53 if ((res->flags ^ r->flags) & type_mask)
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))
62 /* Ok, try it out.. */
63 ret = allocate_resource(r, res, size,
77 * This adds a single pci device to the global
78 * device list and adds sysfs and procfs entries
80 int pci_bus_add_device(struct pci_dev *dev)
83 retval = device_add(&dev->dev);
88 down_write(&pci_bus_sem);
89 list_add_tail(&dev->global_list, &pci_devices);
90 up_write(&pci_bus_sem);
92 pci_proc_attach_device(dev);
93 pci_create_sysfs_dev_files(dev);
98 * pci_bus_add_devices - insert newly discovered PCI devices
99 * @bus: bus to check for new devices
101 * Add newly discovered PCI devices (which are on the bus->devices
102 * list) to the global PCI device list, add the sysfs and procfs
103 * entries. Where a bridge is found, add the discovered bus to
104 * the parents list of child buses, and recurse (breadth-first
105 * to be compatible with 2.4)
107 * Call hotplug for each new devices.
109 void pci_bus_add_devices(struct pci_bus *bus)
112 struct pci_bus *child_bus;
115 list_for_each_entry(dev, &bus->devices, bus_list) {
116 /* Skip already-added devices */
119 retval = pci_bus_add_device(dev);
121 dev_err(&dev->dev, "Error adding device, continuing\n");
124 list_for_each_entry(dev, &bus->devices, bus_list) {
125 BUG_ON(!dev->is_added);
128 * If there is an unattached subordinate bus, attach
129 * it and then scan for unattached PCI devices.
131 if (dev->subordinate) {
132 if (list_empty(&dev->subordinate->node)) {
133 down_write(&pci_bus_sem);
134 list_add_tail(&dev->subordinate->node,
135 &dev->bus->children);
136 up_write(&pci_bus_sem);
138 pci_bus_add_devices(dev->subordinate);
140 /* register the bus with sysfs as the parent is now
141 * properly registered. */
142 child_bus = dev->subordinate;
143 if (child_bus->is_added)
145 child_bus->dev.parent = child_bus->bridge;
146 retval = device_register(&child_bus->dev);
148 dev_err(&dev->dev, "Error registering pci_bus,"
151 child_bus->is_added = 1;
152 retval = device_create_file(&child_bus->dev,
153 &dev_attr_cpuaffinity);
156 dev_err(&dev->dev, "Error creating cpuaffinity"
157 " file, continuing...\n");
162 void pci_enable_bridges(struct pci_bus *bus)
167 list_for_each_entry(dev, &bus->devices, bus_list) {
168 if (dev->subordinate) {
169 retval = pci_enable_device(dev);
171 pci_enable_bridges(dev->subordinate);
176 /** pci_walk_bus - walk devices on/under bus, calling callback.
177 * @top bus whose devices should be walked
178 * @cb callback to be called for each device found
179 * @userdata arbitrary pointer to be passed to callback.
181 * Walk the given bus, including any bridged devices
182 * on buses under this bus. Call the provided callback
183 * on each device found.
185 void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *),
190 struct list_head *next;
193 down_read(&pci_bus_sem);
194 next = top->devices.next;
196 if (next == &bus->devices) {
197 /* end of this bus, go up or finish */
200 next = bus->self->bus_list.next;
201 bus = bus->self->bus;
204 dev = list_entry(next, struct pci_dev, bus_list);
205 if (dev->subordinate) {
206 /* this is a pci-pci bridge, do its devices next */
207 next = dev->subordinate->devices.next;
208 bus = dev->subordinate;
210 next = dev->bus_list.next;
212 /* Run device routines with the device locked */
217 up_read(&pci_bus_sem);
220 EXPORT_SYMBOL(pci_bus_alloc_resource);
221 EXPORT_SYMBOL_GPL(pci_bus_add_device);
222 EXPORT_SYMBOL(pci_bus_add_devices);
223 EXPORT_SYMBOL(pci_enable_bridges);