Merge tag 'md-3.7-fixes' of git://neil.brown.name/md
[deliverable/linux.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 #include <linux/slab.h>
18
19 #include "pci.h"
20
21 void pci_add_resource_offset(struct list_head *resources, struct resource *res,
22 resource_size_t offset)
23 {
24 struct pci_host_bridge_window *window;
25
26 window = kzalloc(sizeof(struct pci_host_bridge_window), GFP_KERNEL);
27 if (!window) {
28 printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
29 return;
30 }
31
32 window->res = res;
33 window->offset = offset;
34 list_add_tail(&window->list, resources);
35 }
36 EXPORT_SYMBOL(pci_add_resource_offset);
37
38 void pci_add_resource(struct list_head *resources, struct resource *res)
39 {
40 pci_add_resource_offset(resources, res, 0);
41 }
42 EXPORT_SYMBOL(pci_add_resource);
43
44 void pci_free_resource_list(struct list_head *resources)
45 {
46 struct pci_host_bridge_window *window, *tmp;
47
48 list_for_each_entry_safe(window, tmp, resources, list) {
49 list_del(&window->list);
50 kfree(window);
51 }
52 }
53 EXPORT_SYMBOL(pci_free_resource_list);
54
55 void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
56 unsigned int flags)
57 {
58 struct pci_bus_resource *bus_res;
59
60 bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
61 if (!bus_res) {
62 dev_err(&bus->dev, "can't add %pR resource\n", res);
63 return;
64 }
65
66 bus_res->res = res;
67 bus_res->flags = flags;
68 list_add_tail(&bus_res->list, &bus->resources);
69 }
70
71 struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
72 {
73 struct pci_bus_resource *bus_res;
74
75 if (n < PCI_BRIDGE_RESOURCE_NUM)
76 return bus->resource[n];
77
78 n -= PCI_BRIDGE_RESOURCE_NUM;
79 list_for_each_entry(bus_res, &bus->resources, list) {
80 if (n-- == 0)
81 return bus_res->res;
82 }
83 return NULL;
84 }
85 EXPORT_SYMBOL_GPL(pci_bus_resource_n);
86
87 void pci_bus_remove_resources(struct pci_bus *bus)
88 {
89 int i;
90 struct pci_bus_resource *bus_res, *tmp;
91
92 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
93 bus->resource[i] = NULL;
94
95 list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
96 list_del(&bus_res->list);
97 kfree(bus_res);
98 }
99 }
100
101 /**
102 * pci_bus_alloc_resource - allocate a resource from a parent bus
103 * @bus: PCI bus
104 * @res: resource to allocate
105 * @size: size of resource to allocate
106 * @align: alignment of resource to allocate
107 * @min: minimum /proc/iomem address to allocate
108 * @type_mask: IORESOURCE_* type flags
109 * @alignf: resource alignment function
110 * @alignf_data: data argument for resource alignment function
111 *
112 * Given the PCI bus a device resides on, the size, minimum address,
113 * alignment and type, try to find an acceptable resource allocation
114 * for a specific device resource.
115 */
116 int
117 pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
118 resource_size_t size, resource_size_t align,
119 resource_size_t min, unsigned int type_mask,
120 resource_size_t (*alignf)(void *,
121 const struct resource *,
122 resource_size_t,
123 resource_size_t),
124 void *alignf_data)
125 {
126 int i, ret = -ENOMEM;
127 struct resource *r;
128 resource_size_t max = -1;
129
130 type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
131
132 /* don't allocate too high if the pref mem doesn't support 64bit*/
133 if (!(res->flags & IORESOURCE_MEM_64))
134 max = PCIBIOS_MAX_MEM_32;
135
136 pci_bus_for_each_resource(bus, r, i) {
137 if (!r)
138 continue;
139
140 /* type_mask must match */
141 if ((res->flags ^ r->flags) & type_mask)
142 continue;
143
144 /* We cannot allocate a non-prefetching resource
145 from a pre-fetching area */
146 if ((r->flags & IORESOURCE_PREFETCH) &&
147 !(res->flags & IORESOURCE_PREFETCH))
148 continue;
149
150 /* Ok, try it out.. */
151 ret = allocate_resource(r, res, size,
152 r->start ? : min,
153 max, align,
154 alignf, alignf_data);
155 if (ret == 0)
156 break;
157 }
158 return ret;
159 }
160
161 /**
162 * pci_bus_add_device - add a single device
163 * @dev: device to add
164 *
165 * This adds a single pci device to the global
166 * device list and adds sysfs and procfs entries
167 */
168 int pci_bus_add_device(struct pci_dev *dev)
169 {
170 int retval;
171
172 pci_fixup_device(pci_fixup_final, dev);
173 retval = device_add(&dev->dev);
174 if (retval)
175 return retval;
176
177 dev->is_added = 1;
178 pci_proc_attach_device(dev);
179 pci_create_sysfs_dev_files(dev);
180 return 0;
181 }
182
183 /**
184 * pci_bus_add_child - add a child bus
185 * @bus: bus to add
186 *
187 * This adds sysfs entries for a single bus
188 */
189 int pci_bus_add_child(struct pci_bus *bus)
190 {
191 int retval;
192
193 if (bus->bridge)
194 bus->dev.parent = bus->bridge;
195
196 retval = device_register(&bus->dev);
197 if (retval)
198 return retval;
199
200 bus->is_added = 1;
201
202 /* Create legacy_io and legacy_mem files for this bus */
203 pci_create_legacy_files(bus);
204
205 return retval;
206 }
207
208 /**
209 * pci_bus_add_devices - insert newly discovered PCI devices
210 * @bus: bus to check for new devices
211 *
212 * Add newly discovered PCI devices (which are on the bus->devices
213 * list) to the global PCI device list, add the sysfs and procfs
214 * entries. Where a bridge is found, add the discovered bus to
215 * the parents list of child buses, and recurse (breadth-first
216 * to be compatible with 2.4)
217 *
218 * Call hotplug for each new devices.
219 */
220 void pci_bus_add_devices(const struct pci_bus *bus)
221 {
222 struct pci_dev *dev;
223 struct pci_bus *child;
224 int retval;
225
226 list_for_each_entry(dev, &bus->devices, bus_list) {
227 /* Skip already-added devices */
228 if (dev->is_added)
229 continue;
230 retval = pci_bus_add_device(dev);
231 if (retval)
232 dev_err(&dev->dev, "Error adding device, continuing\n");
233 }
234
235 list_for_each_entry(dev, &bus->devices, bus_list) {
236 BUG_ON(!dev->is_added);
237
238 child = dev->subordinate;
239 /*
240 * If there is an unattached subordinate bus, attach
241 * it and then scan for unattached PCI devices.
242 */
243 if (!child)
244 continue;
245 if (list_empty(&child->node)) {
246 down_write(&pci_bus_sem);
247 list_add_tail(&child->node, &dev->bus->children);
248 up_write(&pci_bus_sem);
249 }
250 pci_bus_add_devices(child);
251
252 /*
253 * register the bus with sysfs as the parent is now
254 * properly registered.
255 */
256 if (child->is_added)
257 continue;
258 retval = pci_bus_add_child(child);
259 if (retval)
260 dev_err(&dev->dev, "Error adding bus, continuing\n");
261 }
262 }
263
264 void pci_enable_bridges(struct pci_bus *bus)
265 {
266 struct pci_dev *dev;
267 int retval;
268
269 list_for_each_entry(dev, &bus->devices, bus_list) {
270 if (dev->subordinate) {
271 if (!pci_is_enabled(dev)) {
272 retval = pci_enable_device(dev);
273 if (retval)
274 dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval);
275 pci_set_master(dev);
276 }
277 pci_enable_bridges(dev->subordinate);
278 }
279 }
280 }
281
282 /** pci_walk_bus - walk devices on/under bus, calling callback.
283 * @top bus whose devices should be walked
284 * @cb callback to be called for each device found
285 * @userdata arbitrary pointer to be passed to callback.
286 *
287 * Walk the given bus, including any bridged devices
288 * on buses under this bus. Call the provided callback
289 * on each device found.
290 *
291 * We check the return of @cb each time. If it returns anything
292 * other than 0, we break out.
293 *
294 */
295 void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
296 void *userdata)
297 {
298 struct pci_dev *dev;
299 struct pci_bus *bus;
300 struct list_head *next;
301 int retval;
302
303 bus = top;
304 down_read(&pci_bus_sem);
305 next = top->devices.next;
306 for (;;) {
307 if (next == &bus->devices) {
308 /* end of this bus, go up or finish */
309 if (bus == top)
310 break;
311 next = bus->self->bus_list.next;
312 bus = bus->self->bus;
313 continue;
314 }
315 dev = list_entry(next, struct pci_dev, bus_list);
316 if (dev->subordinate) {
317 /* this is a pci-pci bridge, do its devices next */
318 next = dev->subordinate->devices.next;
319 bus = dev->subordinate;
320 } else
321 next = dev->bus_list.next;
322
323 retval = cb(dev, userdata);
324 if (retval)
325 break;
326 }
327 up_read(&pci_bus_sem);
328 }
329 EXPORT_SYMBOL_GPL(pci_walk_bus);
330
331 EXPORT_SYMBOL(pci_bus_alloc_resource);
332 EXPORT_SYMBOL_GPL(pci_bus_add_device);
333 EXPORT_SYMBOL(pci_bus_add_devices);
334 EXPORT_SYMBOL(pci_enable_bridges);
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