Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * From setup-res.c, by:
4 * Dave Rusling (david.rusling@reo.mts.dec.com)
5 * David Mosberger (davidm@cs.arizona.edu)
6 * David Miller (davem@redhat.com)
7 * Ivan Kokshaysky (ink@jurassic.park.msu.ru)
8 */
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/pci.h>
12#include <linux/errno.h>
13#include <linux/ioport.h>
14#include <linux/of.h>
15#include <linux/of_platform.h>
16#include <linux/platform_device.h>
17#include <linux/proc_fs.h>
18#include <linux/slab.h>
19
20#include "pci.h"
21
22/*
23 * The first PCI_BRIDGE_RESOURCE_NUM PCI bus resources (those that correspond
24 * to P2P or CardBus bridge windows) go in a table. Additional ones (for
25 * buses below host bridges or subtractive decode bridges) go in the list.
26 * Use pci_bus_for_each_resource() to iterate through all the resources.
27 */
28
29struct pci_bus_resource {
30 struct list_head list;
31 struct resource *res;
32};
33
34void pci_add_resource_offset(struct list_head *resources, struct resource *res,
35 resource_size_t offset)
36{
37 struct resource_entry *entry;
38
39 entry = resource_list_create_entry(res, 0);
40 if (!entry) {
41 pr_err("PCI: can't add host bridge window %pR\n", res);
42 return;
43 }
44
45 entry->offset = offset;
46 resource_list_add_tail(entry, resources);
47}
48EXPORT_SYMBOL(pci_add_resource_offset);
49
50void pci_add_resource(struct list_head *resources, struct resource *res)
51{
52 pci_add_resource_offset(resources, res, 0);
53}
54EXPORT_SYMBOL(pci_add_resource);
55
56void pci_free_resource_list(struct list_head *resources)
57{
58 resource_list_free(resources);
59}
60EXPORT_SYMBOL(pci_free_resource_list);
61
62void pci_bus_add_resource(struct pci_bus *bus, struct resource *res)
63{
64 struct pci_bus_resource *bus_res;
65
66 bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
67 if (!bus_res) {
68 dev_err(&bus->dev, "can't add %pR resource\n", res);
69 return;
70 }
71
72 bus_res->res = res;
73 list_add_tail(&bus_res->list, &bus->resources);
74}
75
76struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
77{
78 struct pci_bus_resource *bus_res;
79
80 if (n < PCI_BRIDGE_RESOURCE_NUM)
81 return bus->resource[n];
82
83 n -= PCI_BRIDGE_RESOURCE_NUM;
84 list_for_each_entry(bus_res, &bus->resources, list) {
85 if (n-- == 0)
86 return bus_res->res;
87 }
88 return NULL;
89}
90EXPORT_SYMBOL_GPL(pci_bus_resource_n);
91
92void pci_bus_remove_resource(struct pci_bus *bus, struct resource *res)
93{
94 struct pci_bus_resource *bus_res, *tmp;
95 int i;
96
97 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
98 if (bus->resource[i] == res) {
99 bus->resource[i] = NULL;
100 return;
101 }
102 }
103
104 list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
105 if (bus_res->res == res) {
106 list_del(&bus_res->list);
107 kfree(bus_res);
108 return;
109 }
110 }
111}
112
113void pci_bus_remove_resources(struct pci_bus *bus)
114{
115 int i;
116 struct pci_bus_resource *bus_res, *tmp;
117
118 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
119 bus->resource[i] = NULL;
120
121 list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
122 list_del(&bus_res->list);
123 kfree(bus_res);
124 }
125}
126
127int devm_request_pci_bus_resources(struct device *dev,
128 struct list_head *resources)
129{
130 struct resource_entry *win;
131 struct resource *parent, *res;
132 int err;
133
134 resource_list_for_each_entry(win, resources) {
135 res = win->res;
136 switch (resource_type(res)) {
137 case IORESOURCE_IO:
138 parent = &ioport_resource;
139 break;
140 case IORESOURCE_MEM:
141 parent = &iomem_resource;
142 break;
143 default:
144 continue;
145 }
146
147 err = devm_request_resource(dev, parent, res);
148 if (err)
149 return err;
150 }
151
152 return 0;
153}
154EXPORT_SYMBOL_GPL(devm_request_pci_bus_resources);
155
156static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
157#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
158static struct pci_bus_region pci_64_bit = {0,
159 (pci_bus_addr_t) 0xffffffffffffffffULL};
160static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL,
161 (pci_bus_addr_t) 0xffffffffffffffffULL};
162#endif
163
164/*
165 * @res contains CPU addresses. Clip it so the corresponding bus addresses
166 * on @bus are entirely within @region. This is used to control the bus
167 * addresses of resources we allocate, e.g., we may need a resource that
168 * can be mapped by a 32-bit BAR.
169 */
170static void pci_clip_resource_to_region(struct pci_bus *bus,
171 struct resource *res,
172 struct pci_bus_region *region)
173{
174 struct pci_bus_region r;
175
176 pcibios_resource_to_bus(bus, &r, res);
177 if (r.start < region->start)
178 r.start = region->start;
179 if (r.end > region->end)
180 r.end = region->end;
181
182 if (r.end < r.start)
183 res->end = res->start - 1;
184 else
185 pcibios_bus_to_resource(bus, res, &r);
186}
187
188static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
189 resource_size_t size, resource_size_t align,
190 resource_size_t min, unsigned long type_mask,
191 resource_alignf alignf,
192 void *alignf_data,
193 struct pci_bus_region *region)
194{
195 struct resource *r, avail;
196 resource_size_t max;
197 int ret;
198
199 type_mask |= IORESOURCE_TYPE_BITS;
200
201 pci_bus_for_each_resource(bus, r) {
202 resource_size_t min_used = min;
203
204 if (!r)
205 continue;
206
207 /* type_mask must match */
208 if ((res->flags ^ r->flags) & type_mask)
209 continue;
210
211 /* We cannot allocate a non-prefetching resource
212 from a pre-fetching area */
213 if ((r->flags & IORESOURCE_PREFETCH) &&
214 !(res->flags & IORESOURCE_PREFETCH))
215 continue;
216
217 avail = *r;
218 pci_clip_resource_to_region(bus, &avail, region);
219
220 /*
221 * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
222 * protect badly documented motherboard resources, but if
223 * this is an already-configured bridge window, its start
224 * overrides "min".
225 */
226 if (avail.start)
227 min_used = avail.start;
228
229 max = avail.end;
230
231 /* Don't bother if available space isn't large enough */
232 if (size > max - min_used + 1)
233 continue;
234
235 /* Ok, try it out.. */
236 ret = allocate_resource(r, res, size, min_used, max,
237 align, alignf, alignf_data);
238 if (ret == 0)
239 return 0;
240 }
241 return -ENOMEM;
242}
243
244/**
245 * pci_bus_alloc_resource - allocate a resource from a parent bus
246 * @bus: PCI bus
247 * @res: resource to allocate
248 * @size: size of resource to allocate
249 * @align: alignment of resource to allocate
250 * @min: minimum /proc/iomem address to allocate
251 * @type_mask: IORESOURCE_* type flags
252 * @alignf: resource alignment function
253 * @alignf_data: data argument for resource alignment function
254 *
255 * Given the PCI bus a device resides on, the size, minimum address,
256 * alignment and type, try to find an acceptable resource allocation
257 * for a specific device resource.
258 */
259int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
260 resource_size_t size, resource_size_t align,
261 resource_size_t min, unsigned long type_mask,
262 resource_alignf alignf,
263 void *alignf_data)
264{
265#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
266 int rc;
267
268 if (res->flags & IORESOURCE_MEM_64) {
269 rc = pci_bus_alloc_from_region(bus, res, size, align, min,
270 type_mask, alignf, alignf_data,
271 &pci_high);
272 if (rc == 0)
273 return 0;
274
275 return pci_bus_alloc_from_region(bus, res, size, align, min,
276 type_mask, alignf, alignf_data,
277 &pci_64_bit);
278 }
279#endif
280
281 return pci_bus_alloc_from_region(bus, res, size, align, min,
282 type_mask, alignf, alignf_data,
283 &pci_32_bit);
284}
285EXPORT_SYMBOL(pci_bus_alloc_resource);
286
287/*
288 * The @idx resource of @dev should be a PCI-PCI bridge window. If this
289 * resource fits inside a window of an upstream bridge, do nothing. If it
290 * overlaps an upstream window but extends outside it, clip the resource so
291 * it fits completely inside.
292 */
293bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
294{
295 struct pci_bus *bus = dev->bus;
296 struct resource *res = &dev->resource[idx];
297 struct resource orig_res = *res;
298 struct resource *r;
299
300 pci_bus_for_each_resource(bus, r) {
301 resource_size_t start, end;
302
303 if (!r)
304 continue;
305
306 if (resource_type(res) != resource_type(r))
307 continue;
308
309 start = max(r->start, res->start);
310 end = min(r->end, res->end);
311
312 if (start > end)
313 continue; /* no overlap */
314
315 if (res->start == start && res->end == end)
316 return false; /* no change */
317
318 res->start = start;
319 res->end = end;
320 res->flags &= ~IORESOURCE_UNSET;
321 orig_res.flags &= ~IORESOURCE_UNSET;
322 pci_info(dev, "%pR clipped to %pR\n", &orig_res, res);
323
324 return true;
325 }
326
327 return false;
328}
329
330void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
331
332void __weak pcibios_bus_add_device(struct pci_dev *pdev) { }
333
334/*
335 * Create pwrctrl devices (if required) for the PCI devices to handle the power
336 * state.
337 */
338static void pci_pwrctrl_create_devices(struct pci_dev *dev)
339{
340 struct device_node *np = dev_of_node(&dev->dev);
341 struct device *parent = &dev->dev;
342 struct platform_device *pdev;
343
344 /*
345 * First ensure that we are starting from a PCI bridge and it has a
346 * corresponding devicetree node.
347 */
348 if (np && pci_is_bridge(dev)) {
349 /*
350 * Now look for the child PCI device nodes and create pwrctrl
351 * devices for them. The pwrctrl device drivers will manage the
352 * power state of the devices.
353 */
354 for_each_available_child_of_node_scoped(np, child) {
355 /*
356 * First check whether the pwrctrl device really
357 * needs to be created or not. This is decided
358 * based on at least one of the power supplies
359 * being defined in the devicetree node of the
360 * device.
361 */
362 if (!of_pci_supply_present(child)) {
363 pci_dbg(dev, "skipping OF node: %s\n", child->name);
364 return;
365 }
366
367 /* Now create the pwrctrl device */
368 pdev = of_platform_device_create(child, NULL, parent);
369 if (!pdev)
370 pci_err(dev, "failed to create OF node: %s\n", child->name);
371 }
372 }
373}
374
375/**
376 * pci_bus_add_device - start driver for a single device
377 * @dev: device to add
378 *
379 * This adds add sysfs entries and start device drivers
380 */
381void pci_bus_add_device(struct pci_dev *dev)
382{
383 struct device_node *dn = dev->dev.of_node;
384 struct platform_device *pdev;
385 int retval;
386
387 /*
388 * Can not put in pci_device_add yet because resources
389 * are not assigned yet for some devices.
390 */
391 pcibios_bus_add_device(dev);
392 pci_fixup_device(pci_fixup_final, dev);
393 if (pci_is_bridge(dev))
394 of_pci_make_dev_node(dev);
395 pci_create_sysfs_dev_files(dev);
396 pci_proc_attach_device(dev);
397 pci_bridge_d3_update(dev);
398
399 pci_pwrctrl_create_devices(dev);
400
401 /*
402 * If the PCI device is associated with a pwrctrl device with a
403 * power supply, create a device link between the PCI device and
404 * pwrctrl device. This ensures that pwrctrl drivers are probed
405 * before PCI client drivers.
406 */
407 pdev = of_find_device_by_node(dn);
408 if (pdev && of_pci_supply_present(dn)) {
409 if (!device_link_add(&dev->dev, &pdev->dev,
410 DL_FLAG_AUTOREMOVE_CONSUMER))
411 pci_err(dev, "failed to add device link to power control device %s\n",
412 pdev->name);
413 }
414
415 dev->match_driver = !dn || of_device_is_available(dn);
416 retval = device_attach(&dev->dev);
417 if (retval < 0 && retval != -EPROBE_DEFER)
418 pci_warn(dev, "device attach failed (%d)\n", retval);
419
420 pci_dev_assign_added(dev);
421}
422EXPORT_SYMBOL_GPL(pci_bus_add_device);
423
424/**
425 * pci_bus_add_devices - start driver for PCI devices
426 * @bus: bus to check for new devices
427 *
428 * Start driver for PCI devices and add some sysfs entries.
429 */
430void pci_bus_add_devices(const struct pci_bus *bus)
431{
432 struct pci_dev *dev;
433 struct pci_bus *child;
434
435 list_for_each_entry(dev, &bus->devices, bus_list) {
436 /* Skip already-added devices */
437 if (pci_dev_is_added(dev))
438 continue;
439 pci_bus_add_device(dev);
440 }
441
442 list_for_each_entry(dev, &bus->devices, bus_list) {
443 /* Skip if device attach failed */
444 if (!pci_dev_is_added(dev))
445 continue;
446 child = dev->subordinate;
447 if (child)
448 pci_bus_add_devices(child);
449 }
450}
451EXPORT_SYMBOL(pci_bus_add_devices);
452
453static int __pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
454 void *userdata)
455{
456 struct pci_dev *dev;
457 int ret = 0;
458
459 list_for_each_entry(dev, &top->devices, bus_list) {
460 ret = cb(dev, userdata);
461 if (ret)
462 break;
463 if (dev->subordinate) {
464 ret = __pci_walk_bus(dev->subordinate, cb, userdata);
465 if (ret)
466 break;
467 }
468 }
469 return ret;
470}
471
472/**
473 * pci_walk_bus - walk devices on/under bus, calling callback.
474 * @top: bus whose devices should be walked
475 * @cb: callback to be called for each device found
476 * @userdata: arbitrary pointer to be passed to callback
477 *
478 * Walk the given bus, including any bridged devices
479 * on buses under this bus. Call the provided callback
480 * on each device found.
481 *
482 * We check the return of @cb each time. If it returns anything
483 * other than 0, we break out.
484 */
485void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), void *userdata)
486{
487 down_read(&pci_bus_sem);
488 __pci_walk_bus(top, cb, userdata);
489 up_read(&pci_bus_sem);
490}
491EXPORT_SYMBOL_GPL(pci_walk_bus);
492
493void pci_walk_bus_locked(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), void *userdata)
494{
495 lockdep_assert_held(&pci_bus_sem);
496
497 __pci_walk_bus(top, cb, userdata);
498}
499
500struct pci_bus *pci_bus_get(struct pci_bus *bus)
501{
502 if (bus)
503 get_device(&bus->dev);
504 return bus;
505}
506
507void pci_bus_put(struct pci_bus *bus)
508{
509 if (bus)
510 put_device(&bus->dev);
511}
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
94static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
95#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
96static struct pci_bus_region pci_64_bit = {0,
97 (pci_bus_addr_t) 0xffffffffffffffffULL};
98static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL,
99 (pci_bus_addr_t) 0xffffffffffffffffULL};
100#endif
101
102/*
103 * @res contains CPU addresses. Clip it so the corresponding bus addresses
104 * on @bus are entirely within @region. This is used to control the bus
105 * addresses of resources we allocate, e.g., we may need a resource that
106 * can be mapped by a 32-bit BAR.
107 */
108static void pci_clip_resource_to_region(struct pci_bus *bus,
109 struct resource *res,
110 struct pci_bus_region *region)
111{
112 struct pci_bus_region r;
113
114 pcibios_resource_to_bus(bus, &r, res);
115 if (r.start < region->start)
116 r.start = region->start;
117 if (r.end > region->end)
118 r.end = region->end;
119
120 if (r.end < r.start)
121 res->end = res->start - 1;
122 else
123 pcibios_bus_to_resource(bus, res, &r);
124}
125
126static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
127 resource_size_t size, resource_size_t align,
128 resource_size_t min, unsigned long type_mask,
129 resource_size_t (*alignf)(void *,
130 const struct resource *,
131 resource_size_t,
132 resource_size_t),
133 void *alignf_data,
134 struct pci_bus_region *region)
135{
136 int i, ret;
137 struct resource *r, avail;
138 resource_size_t max;
139
140 type_mask |= IORESOURCE_TYPE_BITS;
141
142 pci_bus_for_each_resource(bus, r, i) {
143 resource_size_t min_used = min;
144
145 if (!r)
146 continue;
147
148 /* type_mask must match */
149 if ((res->flags ^ r->flags) & type_mask)
150 continue;
151
152 /* We cannot allocate a non-prefetching resource
153 from a pre-fetching area */
154 if ((r->flags & IORESOURCE_PREFETCH) &&
155 !(res->flags & IORESOURCE_PREFETCH))
156 continue;
157
158 avail = *r;
159 pci_clip_resource_to_region(bus, &avail, region);
160
161 /*
162 * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
163 * protect badly documented motherboard resources, but if
164 * this is an already-configured bridge window, its start
165 * overrides "min".
166 */
167 if (avail.start)
168 min_used = avail.start;
169
170 max = avail.end;
171
172 /* Ok, try it out.. */
173 ret = allocate_resource(r, res, size, min_used, max,
174 align, alignf, alignf_data);
175 if (ret == 0)
176 return 0;
177 }
178 return -ENOMEM;
179}
180
181/**
182 * pci_bus_alloc_resource - allocate a resource from a parent bus
183 * @bus: PCI bus
184 * @res: resource to allocate
185 * @size: size of resource to allocate
186 * @align: alignment of resource to allocate
187 * @min: minimum /proc/iomem address to allocate
188 * @type_mask: IORESOURCE_* type flags
189 * @alignf: resource alignment function
190 * @alignf_data: data argument for resource alignment function
191 *
192 * Given the PCI bus a device resides on, the size, minimum address,
193 * alignment and type, try to find an acceptable resource allocation
194 * for a specific device resource.
195 */
196int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
197 resource_size_t size, resource_size_t align,
198 resource_size_t min, unsigned long type_mask,
199 resource_size_t (*alignf)(void *,
200 const struct resource *,
201 resource_size_t,
202 resource_size_t),
203 void *alignf_data)
204{
205#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
206 int rc;
207
208 if (res->flags & IORESOURCE_MEM_64) {
209 rc = pci_bus_alloc_from_region(bus, res, size, align, min,
210 type_mask, alignf, alignf_data,
211 &pci_high);
212 if (rc == 0)
213 return 0;
214
215 return pci_bus_alloc_from_region(bus, res, size, align, min,
216 type_mask, alignf, alignf_data,
217 &pci_64_bit);
218 }
219#endif
220
221 return pci_bus_alloc_from_region(bus, res, size, align, min,
222 type_mask, alignf, alignf_data,
223 &pci_32_bit);
224}
225EXPORT_SYMBOL(pci_bus_alloc_resource);
226
227/*
228 * The @idx resource of @dev should be a PCI-PCI bridge window. If this
229 * resource fits inside a window of an upstream bridge, do nothing. If it
230 * overlaps an upstream window but extends outside it, clip the resource so
231 * it fits completely inside.
232 */
233bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
234{
235 struct pci_bus *bus = dev->bus;
236 struct resource *res = &dev->resource[idx];
237 struct resource orig_res = *res;
238 struct resource *r;
239 int i;
240
241 pci_bus_for_each_resource(bus, r, i) {
242 resource_size_t start, end;
243
244 if (!r)
245 continue;
246
247 if (resource_type(res) != resource_type(r))
248 continue;
249
250 start = max(r->start, res->start);
251 end = min(r->end, res->end);
252
253 if (start > end)
254 continue; /* no overlap */
255
256 if (res->start == start && res->end == end)
257 return false; /* no change */
258
259 res->start = start;
260 res->end = end;
261 res->flags &= ~IORESOURCE_UNSET;
262 orig_res.flags &= ~IORESOURCE_UNSET;
263 dev_printk(KERN_DEBUG, &dev->dev, "%pR clipped to %pR\n",
264 &orig_res, res);
265
266 return true;
267 }
268
269 return false;
270}
271
272void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
273
274void __weak pcibios_bus_add_device(struct pci_dev *pdev) { }
275
276/**
277 * pci_bus_add_device - start driver for a single device
278 * @dev: device to add
279 *
280 * This adds add sysfs entries and start device drivers
281 */
282void pci_bus_add_device(struct pci_dev *dev)
283{
284 int retval;
285
286 /*
287 * Can not put in pci_device_add yet because resources
288 * are not assigned yet for some devices.
289 */
290 pcibios_bus_add_device(dev);
291 pci_fixup_device(pci_fixup_final, dev);
292 pci_create_sysfs_dev_files(dev);
293 pci_proc_attach_device(dev);
294
295 dev->match_driver = true;
296 retval = device_attach(&dev->dev);
297 if (retval < 0 && retval != -EPROBE_DEFER) {
298 dev_warn(&dev->dev, "device attach failed (%d)\n", retval);
299 pci_proc_detach_device(dev);
300 pci_remove_sysfs_dev_files(dev);
301 return;
302 }
303
304 dev->is_added = 1;
305}
306EXPORT_SYMBOL_GPL(pci_bus_add_device);
307
308/**
309 * pci_bus_add_devices - start driver for PCI devices
310 * @bus: bus to check for new devices
311 *
312 * Start driver for PCI devices and add some sysfs entries.
313 */
314void pci_bus_add_devices(const struct pci_bus *bus)
315{
316 struct pci_dev *dev;
317 struct pci_bus *child;
318
319 list_for_each_entry(dev, &bus->devices, bus_list) {
320 /* Skip already-added devices */
321 if (dev->is_added)
322 continue;
323 pci_bus_add_device(dev);
324 }
325
326 list_for_each_entry(dev, &bus->devices, bus_list) {
327 /* Skip if device attach failed */
328 if (!dev->is_added)
329 continue;
330 child = dev->subordinate;
331 if (child)
332 pci_bus_add_devices(child);
333 }
334}
335EXPORT_SYMBOL(pci_bus_add_devices);
336
337/** pci_walk_bus - walk devices on/under bus, calling callback.
338 * @top bus whose devices should be walked
339 * @cb callback to be called for each device found
340 * @userdata arbitrary pointer to be passed to callback.
341 *
342 * Walk the given bus, including any bridged devices
343 * on buses under this bus. Call the provided callback
344 * on each device found.
345 *
346 * We check the return of @cb each time. If it returns anything
347 * other than 0, we break out.
348 *
349 */
350void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
351 void *userdata)
352{
353 struct pci_dev *dev;
354 struct pci_bus *bus;
355 struct list_head *next;
356 int retval;
357
358 bus = top;
359 down_read(&pci_bus_sem);
360 next = top->devices.next;
361 for (;;) {
362 if (next == &bus->devices) {
363 /* end of this bus, go up or finish */
364 if (bus == top)
365 break;
366 next = bus->self->bus_list.next;
367 bus = bus->self->bus;
368 continue;
369 }
370 dev = list_entry(next, struct pci_dev, bus_list);
371 if (dev->subordinate) {
372 /* this is a pci-pci bridge, do its devices next */
373 next = dev->subordinate->devices.next;
374 bus = dev->subordinate;
375 } else
376 next = dev->bus_list.next;
377
378 retval = cb(dev, userdata);
379 if (retval)
380 break;
381 }
382 up_read(&pci_bus_sem);
383}
384EXPORT_SYMBOL_GPL(pci_walk_bus);
385
386struct pci_bus *pci_bus_get(struct pci_bus *bus)
387{
388 if (bus)
389 get_device(&bus->dev);
390 return bus;
391}
392EXPORT_SYMBOL(pci_bus_get);
393
394void pci_bus_put(struct pci_bus *bus)
395{
396 if (bus)
397 put_device(&bus->dev);
398}
399EXPORT_SYMBOL(pci_bus_put);
400