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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
21void 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}
36EXPORT_SYMBOL(pci_add_resource_offset);
37
38void pci_add_resource(struct list_head *resources, struct resource *res)
39{
40 pci_add_resource_offset(resources, res, 0);
41}
42EXPORT_SYMBOL(pci_add_resource);
43
44void 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}
53EXPORT_SYMBOL(pci_free_resource_list);
54
55void 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
71struct 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}
85EXPORT_SYMBOL_GPL(pci_bus_resource_n);
86
87void pci_bus_remove_resources(struct pci_bus *bus)
88{
89 int i;
90
91 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
92 bus->resource[i] = NULL;
93
94 pci_free_resource_list(&bus->resources);
95}
96
97/**
98 * pci_bus_alloc_resource - allocate a resource from a parent bus
99 * @bus: PCI bus
100 * @res: resource to allocate
101 * @size: size of resource to allocate
102 * @align: alignment of resource to allocate
103 * @min: minimum /proc/iomem address to allocate
104 * @type_mask: IORESOURCE_* type flags
105 * @alignf: resource alignment function
106 * @alignf_data: data argument for resource alignment function
107 *
108 * Given the PCI bus a device resides on, the size, minimum address,
109 * alignment and type, try to find an acceptable resource allocation
110 * for a specific device resource.
111 */
112int
113pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
114 resource_size_t size, resource_size_t align,
115 resource_size_t min, unsigned int type_mask,
116 resource_size_t (*alignf)(void *,
117 const struct resource *,
118 resource_size_t,
119 resource_size_t),
120 void *alignf_data)
121{
122 int i, ret = -ENOMEM;
123 struct resource *r;
124 resource_size_t max = -1;
125
126 type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
127
128 /* don't allocate too high if the pref mem doesn't support 64bit*/
129 if (!(res->flags & IORESOURCE_MEM_64))
130 max = PCIBIOS_MAX_MEM_32;
131
132 pci_bus_for_each_resource(bus, r, i) {
133 if (!r)
134 continue;
135
136 /* type_mask must match */
137 if ((res->flags ^ r->flags) & type_mask)
138 continue;
139
140 /* We cannot allocate a non-prefetching resource
141 from a pre-fetching area */
142 if ((r->flags & IORESOURCE_PREFETCH) &&
143 !(res->flags & IORESOURCE_PREFETCH))
144 continue;
145
146 /* Ok, try it out.. */
147 ret = allocate_resource(r, res, size,
148 r->start ? : min,
149 max, align,
150 alignf, alignf_data);
151 if (ret == 0)
152 break;
153 }
154 return ret;
155}
156
157/**
158 * pci_bus_add_device - add a single device
159 * @dev: device to add
160 *
161 * This adds a single pci device to the global
162 * device list and adds sysfs and procfs entries
163 */
164int pci_bus_add_device(struct pci_dev *dev)
165{
166 int retval;
167 retval = device_add(&dev->dev);
168 if (retval)
169 return retval;
170
171 dev->is_added = 1;
172 pci_proc_attach_device(dev);
173 pci_create_sysfs_dev_files(dev);
174 return 0;
175}
176
177/**
178 * pci_bus_add_child - add a child bus
179 * @bus: bus to add
180 *
181 * This adds sysfs entries for a single bus
182 */
183int pci_bus_add_child(struct pci_bus *bus)
184{
185 int retval;
186
187 if (bus->bridge)
188 bus->dev.parent = bus->bridge;
189
190 retval = device_register(&bus->dev);
191 if (retval)
192 return retval;
193
194 bus->is_added = 1;
195
196 /* Create legacy_io and legacy_mem files for this bus */
197 pci_create_legacy_files(bus);
198
199 return retval;
200}
201
202/**
203 * pci_bus_add_devices - insert newly discovered PCI devices
204 * @bus: bus to check for new devices
205 *
206 * Add newly discovered PCI devices (which are on the bus->devices
207 * list) to the global PCI device list, add the sysfs and procfs
208 * entries. Where a bridge is found, add the discovered bus to
209 * the parents list of child buses, and recurse (breadth-first
210 * to be compatible with 2.4)
211 *
212 * Call hotplug for each new devices.
213 */
214void pci_bus_add_devices(const struct pci_bus *bus)
215{
216 struct pci_dev *dev;
217 struct pci_bus *child;
218 int retval;
219
220 list_for_each_entry(dev, &bus->devices, bus_list) {
221 /* Skip already-added devices */
222 if (dev->is_added)
223 continue;
224 retval = pci_bus_add_device(dev);
225 if (retval)
226 dev_err(&dev->dev, "Error adding device, continuing\n");
227 }
228
229 list_for_each_entry(dev, &bus->devices, bus_list) {
230 BUG_ON(!dev->is_added);
231
232 child = dev->subordinate;
233 /*
234 * If there is an unattached subordinate bus, attach
235 * it and then scan for unattached PCI devices.
236 */
237 if (!child)
238 continue;
239 if (list_empty(&child->node)) {
240 down_write(&pci_bus_sem);
241 list_add_tail(&child->node, &dev->bus->children);
242 up_write(&pci_bus_sem);
243 }
244 pci_bus_add_devices(child);
245
246 /*
247 * register the bus with sysfs as the parent is now
248 * properly registered.
249 */
250 if (child->is_added)
251 continue;
252 retval = pci_bus_add_child(child);
253 if (retval)
254 dev_err(&dev->dev, "Error adding bus, continuing\n");
255 }
256}
257
258void pci_enable_bridges(struct pci_bus *bus)
259{
260 struct pci_dev *dev;
261 int retval;
262
263 list_for_each_entry(dev, &bus->devices, bus_list) {
264 if (dev->subordinate) {
265 if (!pci_is_enabled(dev)) {
266 retval = pci_enable_device(dev);
267 if (retval)
268 dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval);
269 pci_set_master(dev);
270 }
271 pci_enable_bridges(dev->subordinate);
272 }
273 }
274}
275
276/** pci_walk_bus - walk devices on/under bus, calling callback.
277 * @top bus whose devices should be walked
278 * @cb callback to be called for each device found
279 * @userdata arbitrary pointer to be passed to callback.
280 *
281 * Walk the given bus, including any bridged devices
282 * on buses under this bus. Call the provided callback
283 * on each device found.
284 *
285 * We check the return of @cb each time. If it returns anything
286 * other than 0, we break out.
287 *
288 */
289void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
290 void *userdata)
291{
292 struct pci_dev *dev;
293 struct pci_bus *bus;
294 struct list_head *next;
295 int retval;
296
297 bus = top;
298 down_read(&pci_bus_sem);
299 next = top->devices.next;
300 for (;;) {
301 if (next == &bus->devices) {
302 /* end of this bus, go up or finish */
303 if (bus == top)
304 break;
305 next = bus->self->bus_list.next;
306 bus = bus->self->bus;
307 continue;
308 }
309 dev = list_entry(next, struct pci_dev, bus_list);
310 if (dev->subordinate) {
311 /* this is a pci-pci bridge, do its devices next */
312 next = dev->subordinate->devices.next;
313 bus = dev->subordinate;
314 } else
315 next = dev->bus_list.next;
316
317 /* Run device routines with the device locked */
318 device_lock(&dev->dev);
319 retval = cb(dev, userdata);
320 device_unlock(&dev->dev);
321 if (retval)
322 break;
323 }
324 up_read(&pci_bus_sem);
325}
326EXPORT_SYMBOL_GPL(pci_walk_bus);
327
328EXPORT_SYMBOL(pci_bus_alloc_resource);
329EXPORT_SYMBOL_GPL(pci_bus_add_device);
330EXPORT_SYMBOL(pci_bus_add_devices);
331EXPORT_SYMBOL(pci_enable_bridges);
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/slab.h>
17
18#include "pci.h"
19
20void pci_add_resource_offset(struct list_head *resources, struct resource *res,
21 resource_size_t offset)
22{
23 struct resource_entry *entry;
24
25 entry = resource_list_create_entry(res, 0);
26 if (!entry) {
27 printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
28 return;
29 }
30
31 entry->offset = offset;
32 resource_list_add_tail(entry, resources);
33}
34EXPORT_SYMBOL(pci_add_resource_offset);
35
36void pci_add_resource(struct list_head *resources, struct resource *res)
37{
38 pci_add_resource_offset(resources, res, 0);
39}
40EXPORT_SYMBOL(pci_add_resource);
41
42void pci_free_resource_list(struct list_head *resources)
43{
44 resource_list_free(resources);
45}
46EXPORT_SYMBOL(pci_free_resource_list);
47
48void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
49 unsigned int flags)
50{
51 struct pci_bus_resource *bus_res;
52
53 bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
54 if (!bus_res) {
55 dev_err(&bus->dev, "can't add %pR resource\n", res);
56 return;
57 }
58
59 bus_res->res = res;
60 bus_res->flags = flags;
61 list_add_tail(&bus_res->list, &bus->resources);
62}
63
64struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
65{
66 struct pci_bus_resource *bus_res;
67
68 if (n < PCI_BRIDGE_RESOURCE_NUM)
69 return bus->resource[n];
70
71 n -= PCI_BRIDGE_RESOURCE_NUM;
72 list_for_each_entry(bus_res, &bus->resources, list) {
73 if (n-- == 0)
74 return bus_res->res;
75 }
76 return NULL;
77}
78EXPORT_SYMBOL_GPL(pci_bus_resource_n);
79
80void pci_bus_remove_resources(struct pci_bus *bus)
81{
82 int i;
83 struct pci_bus_resource *bus_res, *tmp;
84
85 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
86 bus->resource[i] = NULL;
87
88 list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
89 list_del(&bus_res->list);
90 kfree(bus_res);
91 }
92}
93
94int devm_request_pci_bus_resources(struct device *dev,
95 struct list_head *resources)
96{
97 struct resource_entry *win;
98 struct resource *parent, *res;
99 int err;
100
101 resource_list_for_each_entry(win, resources) {
102 res = win->res;
103 switch (resource_type(res)) {
104 case IORESOURCE_IO:
105 parent = &ioport_resource;
106 break;
107 case IORESOURCE_MEM:
108 parent = &iomem_resource;
109 break;
110 default:
111 continue;
112 }
113
114 err = devm_request_resource(dev, parent, res);
115 if (err)
116 return err;
117 }
118
119 return 0;
120}
121EXPORT_SYMBOL_GPL(devm_request_pci_bus_resources);
122
123static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
124#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
125static struct pci_bus_region pci_64_bit = {0,
126 (pci_bus_addr_t) 0xffffffffffffffffULL};
127static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL,
128 (pci_bus_addr_t) 0xffffffffffffffffULL};
129#endif
130
131/*
132 * @res contains CPU addresses. Clip it so the corresponding bus addresses
133 * on @bus are entirely within @region. This is used to control the bus
134 * addresses of resources we allocate, e.g., we may need a resource that
135 * can be mapped by a 32-bit BAR.
136 */
137static void pci_clip_resource_to_region(struct pci_bus *bus,
138 struct resource *res,
139 struct pci_bus_region *region)
140{
141 struct pci_bus_region r;
142
143 pcibios_resource_to_bus(bus, &r, res);
144 if (r.start < region->start)
145 r.start = region->start;
146 if (r.end > region->end)
147 r.end = region->end;
148
149 if (r.end < r.start)
150 res->end = res->start - 1;
151 else
152 pcibios_bus_to_resource(bus, res, &r);
153}
154
155static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
156 resource_size_t size, resource_size_t align,
157 resource_size_t min, unsigned long type_mask,
158 resource_size_t (*alignf)(void *,
159 const struct resource *,
160 resource_size_t,
161 resource_size_t),
162 void *alignf_data,
163 struct pci_bus_region *region)
164{
165 int i, ret;
166 struct resource *r, avail;
167 resource_size_t max;
168
169 type_mask |= IORESOURCE_TYPE_BITS;
170
171 pci_bus_for_each_resource(bus, r, i) {
172 resource_size_t min_used = min;
173
174 if (!r)
175 continue;
176
177 /* type_mask must match */
178 if ((res->flags ^ r->flags) & type_mask)
179 continue;
180
181 /* We cannot allocate a non-prefetching resource
182 from a pre-fetching area */
183 if ((r->flags & IORESOURCE_PREFETCH) &&
184 !(res->flags & IORESOURCE_PREFETCH))
185 continue;
186
187 avail = *r;
188 pci_clip_resource_to_region(bus, &avail, region);
189
190 /*
191 * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
192 * protect badly documented motherboard resources, but if
193 * this is an already-configured bridge window, its start
194 * overrides "min".
195 */
196 if (avail.start)
197 min_used = avail.start;
198
199 max = avail.end;
200
201 /* Ok, try it out.. */
202 ret = allocate_resource(r, res, size, min_used, max,
203 align, alignf, alignf_data);
204 if (ret == 0)
205 return 0;
206 }
207 return -ENOMEM;
208}
209
210/**
211 * pci_bus_alloc_resource - allocate a resource from a parent bus
212 * @bus: PCI bus
213 * @res: resource to allocate
214 * @size: size of resource to allocate
215 * @align: alignment of resource to allocate
216 * @min: minimum /proc/iomem address to allocate
217 * @type_mask: IORESOURCE_* type flags
218 * @alignf: resource alignment function
219 * @alignf_data: data argument for resource alignment function
220 *
221 * Given the PCI bus a device resides on, the size, minimum address,
222 * alignment and type, try to find an acceptable resource allocation
223 * for a specific device resource.
224 */
225int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
226 resource_size_t size, resource_size_t align,
227 resource_size_t min, unsigned long type_mask,
228 resource_size_t (*alignf)(void *,
229 const struct resource *,
230 resource_size_t,
231 resource_size_t),
232 void *alignf_data)
233{
234#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
235 int rc;
236
237 if (res->flags & IORESOURCE_MEM_64) {
238 rc = pci_bus_alloc_from_region(bus, res, size, align, min,
239 type_mask, alignf, alignf_data,
240 &pci_high);
241 if (rc == 0)
242 return 0;
243
244 return pci_bus_alloc_from_region(bus, res, size, align, min,
245 type_mask, alignf, alignf_data,
246 &pci_64_bit);
247 }
248#endif
249
250 return pci_bus_alloc_from_region(bus, res, size, align, min,
251 type_mask, alignf, alignf_data,
252 &pci_32_bit);
253}
254EXPORT_SYMBOL(pci_bus_alloc_resource);
255
256/*
257 * The @idx resource of @dev should be a PCI-PCI bridge window. If this
258 * resource fits inside a window of an upstream bridge, do nothing. If it
259 * overlaps an upstream window but extends outside it, clip the resource so
260 * it fits completely inside.
261 */
262bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
263{
264 struct pci_bus *bus = dev->bus;
265 struct resource *res = &dev->resource[idx];
266 struct resource orig_res = *res;
267 struct resource *r;
268 int i;
269
270 pci_bus_for_each_resource(bus, r, i) {
271 resource_size_t start, end;
272
273 if (!r)
274 continue;
275
276 if (resource_type(res) != resource_type(r))
277 continue;
278
279 start = max(r->start, res->start);
280 end = min(r->end, res->end);
281
282 if (start > end)
283 continue; /* no overlap */
284
285 if (res->start == start && res->end == end)
286 return false; /* no change */
287
288 res->start = start;
289 res->end = end;
290 res->flags &= ~IORESOURCE_UNSET;
291 orig_res.flags &= ~IORESOURCE_UNSET;
292 dev_printk(KERN_DEBUG, &dev->dev, "%pR clipped to %pR\n",
293 &orig_res, res);
294
295 return true;
296 }
297
298 return false;
299}
300
301void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
302
303void __weak pcibios_bus_add_device(struct pci_dev *pdev) { }
304
305/**
306 * pci_bus_add_device - start driver for a single device
307 * @dev: device to add
308 *
309 * This adds add sysfs entries and start device drivers
310 */
311void pci_bus_add_device(struct pci_dev *dev)
312{
313 int retval;
314
315 /*
316 * Can not put in pci_device_add yet because resources
317 * are not assigned yet for some devices.
318 */
319 pcibios_bus_add_device(dev);
320 pci_fixup_device(pci_fixup_final, dev);
321 pci_create_sysfs_dev_files(dev);
322 pci_proc_attach_device(dev);
323 pci_bridge_d3_update(dev);
324
325 dev->match_driver = true;
326 retval = device_attach(&dev->dev);
327 if (retval < 0 && retval != -EPROBE_DEFER) {
328 dev_warn(&dev->dev, "device attach failed (%d)\n", retval);
329 pci_proc_detach_device(dev);
330 pci_remove_sysfs_dev_files(dev);
331 return;
332 }
333
334 dev->is_added = 1;
335}
336EXPORT_SYMBOL_GPL(pci_bus_add_device);
337
338/**
339 * pci_bus_add_devices - start driver for PCI devices
340 * @bus: bus to check for new devices
341 *
342 * Start driver for PCI devices and add some sysfs entries.
343 */
344void pci_bus_add_devices(const struct pci_bus *bus)
345{
346 struct pci_dev *dev;
347 struct pci_bus *child;
348
349 list_for_each_entry(dev, &bus->devices, bus_list) {
350 /* Skip already-added devices */
351 if (dev->is_added)
352 continue;
353 pci_bus_add_device(dev);
354 }
355
356 list_for_each_entry(dev, &bus->devices, bus_list) {
357 /* Skip if device attach failed */
358 if (!dev->is_added)
359 continue;
360 child = dev->subordinate;
361 if (child)
362 pci_bus_add_devices(child);
363 }
364}
365EXPORT_SYMBOL(pci_bus_add_devices);
366
367/** pci_walk_bus - walk devices on/under bus, calling callback.
368 * @top bus whose devices should be walked
369 * @cb callback to be called for each device found
370 * @userdata arbitrary pointer to be passed to callback.
371 *
372 * Walk the given bus, including any bridged devices
373 * on buses under this bus. Call the provided callback
374 * on each device found.
375 *
376 * We check the return of @cb each time. If it returns anything
377 * other than 0, we break out.
378 *
379 */
380void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
381 void *userdata)
382{
383 struct pci_dev *dev;
384 struct pci_bus *bus;
385 struct list_head *next;
386 int retval;
387
388 bus = top;
389 down_read(&pci_bus_sem);
390 next = top->devices.next;
391 for (;;) {
392 if (next == &bus->devices) {
393 /* end of this bus, go up or finish */
394 if (bus == top)
395 break;
396 next = bus->self->bus_list.next;
397 bus = bus->self->bus;
398 continue;
399 }
400 dev = list_entry(next, struct pci_dev, bus_list);
401 if (dev->subordinate) {
402 /* this is a pci-pci bridge, do its devices next */
403 next = dev->subordinate->devices.next;
404 bus = dev->subordinate;
405 } else
406 next = dev->bus_list.next;
407
408 retval = cb(dev, userdata);
409 if (retval)
410 break;
411 }
412 up_read(&pci_bus_sem);
413}
414EXPORT_SYMBOL_GPL(pci_walk_bus);
415
416struct pci_bus *pci_bus_get(struct pci_bus *bus)
417{
418 if (bus)
419 get_device(&bus->dev);
420 return bus;
421}
422EXPORT_SYMBOL(pci_bus_get);
423
424void pci_bus_put(struct pci_bus *bus)
425{
426 if (bus)
427 put_device(&bus->dev);
428}
429EXPORT_SYMBOL(pci_bus_put);