PCI: Add legacy_io/mem to all busses
[linux-2.6.git] / drivers / pci / bus.c
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,
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)
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.. */
63                 ret = allocate_resource(r, res, size,
64                                         r->start ? : min,
65                                         -1, align,
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  */
80 int pci_bus_add_device(struct pci_dev *dev)
81 {
82         int retval;
83         retval = device_add(&dev->dev);
84         if (retval)
85                 return retval;
86
87         dev->is_added = 1;
88         pci_proc_attach_device(dev);
89         pci_create_sysfs_dev_files(dev);
90         return 0;
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  */
105 void pci_bus_add_devices(struct pci_bus *bus)
106 {
107         struct pci_dev *dev;
108         struct pci_bus *child_bus;
109         int retval;
110
111         list_for_each_entry(dev, &bus->devices, bus_list) {
112                 /* Skip already-added devices */
113                 if (dev->is_added)
114                         continue;
115                 retval = pci_bus_add_device(dev);
116                 if (retval)
117                         dev_err(&dev->dev, "Error adding device, continuing\n");
118         }
119
120         list_for_each_entry(dev, &bus->devices, bus_list) {
121                 BUG_ON(!dev->is_added);
122
123                 /*
124                  * If there is an unattached subordinate bus, attach
125                  * it and then scan for unattached PCI devices.
126                  */
127                 if (dev->subordinate) {
128                        if (list_empty(&dev->subordinate->node)) {
129                                down_write(&pci_bus_sem);
130                                list_add_tail(&dev->subordinate->node,
131                                                &dev->bus->children);
132                                up_write(&pci_bus_sem);
133                         }
134                         pci_bus_add_devices(dev->subordinate);
135
136                         /* register the bus with sysfs as the parent is now
137                          * properly registered. */
138                         child_bus = dev->subordinate;
139                         if (child_bus->is_added)
140                                 continue;
141                         child_bus->dev.parent = child_bus->bridge;
142                         retval = device_register(&child_bus->dev);
143                         if (retval)
144                                 dev_err(&dev->dev, "Error registering pci_bus,"
145                                         " continuing...\n");
146                         else {
147                                 child_bus->is_added = 1;
148                                 retval = device_create_file(&child_bus->dev,
149                                                         &dev_attr_cpuaffinity);
150                         }
151                         if (retval)
152                                 dev_err(&dev->dev, "Error creating cpuaffinity"
153                                         " file, continuing...\n");
154
155                         retval = device_create_file(&child_bus->dev,
156                                                 &dev_attr_cpulistaffinity);
157                         if (retval)
158                                 dev_err(&dev->dev,
159                                         "Error creating cpulistaffinity"
160                                         " file, continuing...\n");
161
162                         /* Create legacy_io and legacy_mem files for this bus */
163                         pci_create_legacy_files(child_bus);
164
165                 }
166         }
167 }
168
169 void pci_enable_bridges(struct pci_bus *bus)
170 {
171         struct pci_dev *dev;
172         int retval;
173
174         list_for_each_entry(dev, &bus->devices, bus_list) {
175                 if (dev->subordinate) {
176                         retval = pci_enable_device(dev);
177                         pci_set_master(dev);
178                         pci_enable_bridges(dev->subordinate);
179                 }
180         }
181 }
182
183 /** pci_walk_bus - walk devices on/under bus, calling callback.
184  *  @top      bus whose devices should be walked
185  *  @cb       callback to be called for each device found
186  *  @userdata arbitrary pointer to be passed to callback.
187  *
188  *  Walk the given bus, including any bridged devices
189  *  on buses under this bus.  Call the provided callback
190  *  on each device found.
191  */
192 void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *),
193                   void *userdata)
194 {
195         struct pci_dev *dev;
196         struct pci_bus *bus;
197         struct list_head *next;
198
199         bus = top;
200         down_read(&pci_bus_sem);
201         next = top->devices.next;
202         for (;;) {
203                 if (next == &bus->devices) {
204                         /* end of this bus, go up or finish */
205                         if (bus == top)
206                                 break;
207                         next = bus->self->bus_list.next;
208                         bus = bus->self->bus;
209                         continue;
210                 }
211                 dev = list_entry(next, struct pci_dev, bus_list);
212                 if (dev->subordinate) {
213                         /* this is a pci-pci bridge, do its devices next */
214                         next = dev->subordinate->devices.next;
215                         bus = dev->subordinate;
216                 } else
217                         next = dev->bus_list.next;
218
219                 /* Run device routines with the device locked */
220                 down(&dev->dev.sem);
221                 cb(dev, userdata);
222                 up(&dev->dev.sem);
223         }
224         up_read(&pci_bus_sem);
225 }
226
227 EXPORT_SYMBOL(pci_bus_alloc_resource);
228 EXPORT_SYMBOL_GPL(pci_bus_add_device);
229 EXPORT_SYMBOL(pci_bus_add_devices);
230 EXPORT_SYMBOL(pci_enable_bridges);