blob: 6293ce0f35327f6d5df2c997a34555033844b9c6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
18#include "pci.h"
19
Bjorn Helgaas0efd5aa2012-02-23 20:19:00 -070020void pci_add_resource_offset(struct list_head *resources, struct resource *res,
21 resource_size_t offset)
Bjorn Helgaas45ca9e92011-10-28 16:25:35 -060022{
Jiang Liu14d76b62015-02-05 13:44:44 +080023 struct resource_entry *entry;
Bjorn Helgaas45ca9e92011-10-28 16:25:35 -060024
Jiang Liu14d76b62015-02-05 13:44:44 +080025 entry = resource_list_create_entry(res, 0);
26 if (!entry) {
Bjorn Helgaas0efd5aa2012-02-23 20:19:00 -070027 printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
Bjorn Helgaas45ca9e92011-10-28 16:25:35 -060028 return;
29 }
30
Jiang Liu14d76b62015-02-05 13:44:44 +080031 entry->offset = offset;
32 resource_list_add_tail(entry, resources);
Bjorn Helgaas0efd5aa2012-02-23 20:19:00 -070033}
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);
Bjorn Helgaas45ca9e92011-10-28 16:25:35 -060039}
40EXPORT_SYMBOL(pci_add_resource);
41
42void pci_free_resource_list(struct list_head *resources)
43{
Jiang Liu14d76b62015-02-05 13:44:44 +080044 resource_list_free(resources);
Bjorn Helgaas45ca9e92011-10-28 16:25:35 -060045}
46EXPORT_SYMBOL(pci_free_resource_list);
47
Bjorn Helgaas2fe2abf2010-02-23 10:24:36 -070048void 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{
Bjorn Helgaas2fe2abf2010-02-23 10:24:36 -070082 int i;
Yinghai Lu817a2682012-09-14 17:48:41 -070083 struct pci_bus_resource *bus_res, *tmp;
Bjorn Helgaas2fe2abf2010-02-23 10:24:36 -070084
85 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
Stephen Hemminger7736a052010-06-01 09:00:16 -070086 bus->resource[i] = NULL;
Bjorn Helgaas2fe2abf2010-02-23 10:24:36 -070087
Yinghai Lu817a2682012-09-14 17:48:41 -070088 list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
89 list_del(&bus_res->list);
90 kfree(bus_res);
91 }
Bjorn Helgaas2fe2abf2010-02-23 10:24:36 -070092}
93
Bjorn Helgaas950334b2016-05-28 18:09:16 -050094int 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
Yinghai Luf75b99d2013-12-20 09:57:37 -0700123static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
Yinghai Lu3a9ad0b2015-05-27 17:23:51 -0700124#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
Yinghai Luf75b99d2013-12-20 09:57:37 -0700125static struct pci_bus_region pci_64_bit = {0,
Yinghai Lu3a9ad0b2015-05-27 17:23:51 -0700126 (pci_bus_addr_t) 0xffffffffffffffffULL};
127static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL,
128 (pci_bus_addr_t) 0xffffffffffffffffULL};
Yinghai Luf75b99d2013-12-20 09:57:37 -0700129#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.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 */
Yinghai Luf75b99d2013-12-20 09:57:37 -0700137static 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,
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700156 resource_size_t size, resource_size_t align,
Bjorn Helgaas664c2842014-03-07 13:51:12 -0700157 resource_size_t min, unsigned long type_mask,
Dominik Brodowskib26b2d42010-01-01 17:40:49 +0100158 resource_size_t (*alignf)(void *,
Dominik Brodowski3b7a17f2010-01-01 17:40:50 +0100159 const struct resource *,
Dominik Brodowskib26b2d42010-01-01 17:40:49 +0100160 resource_size_t,
161 resource_size_t),
Yinghai Luf75b99d2013-12-20 09:57:37 -0700162 void *alignf_data,
163 struct pci_bus_region *region)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
Yinghai Luf75b99d2013-12-20 09:57:37 -0700165 int i, ret;
166 struct resource *r, avail;
167 resource_size_t max;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Bjorn Helgaasaa11fc52014-03-07 13:39:01 -0700169 type_mask |= IORESOURCE_TYPE_BITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Bjorn Helgaas6db45b72010-12-16 10:38:36 -0700171 pci_bus_for_each_resource(bus, r, i) {
Christoph Biedl3460baa2015-12-23 16:51:57 +0100172 resource_size_t min_used = min;
173
Bjorn Helgaas6db45b72010-12-16 10:38:36 -0700174 if (!r)
175 continue;
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 /* 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
Yinghai Luf75b99d2013-12-20 09:57:37 -0700187 avail = *r;
188 pci_clip_resource_to_region(bus, &avail, region);
Yinghai Luf75b99d2013-12-20 09:57:37 -0700189
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)
Christoph Biedl3460baa2015-12-23 16:51:57 +0100197 min_used = avail.start;
Yinghai Luf75b99d2013-12-20 09:57:37 -0700198
199 max = avail.end;
200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 /* Ok, try it out.. */
Christoph Biedl3460baa2015-12-23 16:51:57 +0100202 ret = allocate_resource(r, res, size, min_used, max,
Yinghai Luf75b99d2013-12-20 09:57:37 -0700203 align, alignf, alignf_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 if (ret == 0)
Yinghai Luf75b99d2013-12-20 09:57:37 -0700205 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 }
Yinghai Luf75b99d2013-12-20 09:57:37 -0700207 return -ENOMEM;
208}
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210/**
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 */
Yinghai Lud56dbf52013-12-20 10:55:44 -0700225int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 resource_size_t size, resource_size_t align,
Bjorn Helgaas664c2842014-03-07 13:51:12 -0700227 resource_size_t min, unsigned long type_mask,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 resource_size_t (*alignf)(void *,
229 const struct resource *,
230 resource_size_t,
231 resource_size_t),
232 void *alignf_data)
233{
Yinghai Lu3a9ad0b2015-05-27 17:23:51 -0700234#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
Yinghai Lud56dbf52013-12-20 10:55:44 -0700235 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
Yinghai Luf75b99d2013-12-20 09:57:37 -0700244 return pci_bus_alloc_from_region(bus, res, size, align, min,
245 type_mask, alignf, alignf_data,
246 &pci_64_bit);
Yinghai Lud56dbf52013-12-20 10:55:44 -0700247 }
Yinghai Luf75b99d2013-12-20 09:57:37 -0700248#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Yinghai Luf75b99d2013-12-20 09:57:37 -0700250 return pci_bus_alloc_from_region(bus, res, size, align, min,
251 type_mask, alignf, alignf_data,
252 &pci_32_bit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -0600254EXPORT_SYMBOL(pci_bus_alloc_resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
Yinghai Lu0f7e7ae2015-01-15 16:21:49 -0600256/*
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;
Bjorn Helgaasb838b392015-09-22 17:03:54 -0500290 res->flags &= ~IORESOURCE_UNSET;
291 orig_res.flags &= ~IORESOURCE_UNSET;
Yinghai Lu0f7e7ae2015-01-15 16:21:49 -0600292 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
Yinghai Lu3c449ed2012-11-03 21:39:31 -0700301void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
302
Wei Yang7b770612016-03-04 10:53:04 +1100303void __weak pcibios_bus_add_device(struct pci_dev *pdev) { }
304
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305/**
Yinghai Lu4f535092013-01-21 13:20:52 -0800306 * pci_bus_add_device - start driver for a single device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 * @dev: device to add
308 *
Yinghai Lu4f535092013-01-21 13:20:52 -0800309 * This adds add sysfs entries and start device drivers
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 */
Yijing Wangc893d132014-05-30 11:01:03 +0800311void pci_bus_add_device(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312{
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700313 int retval;
Myron Stowe735bff12012-07-09 15:36:46 -0600314
Yinghai Lu4f535092013-01-21 13:20:52 -0800315 /*
316 * Can not put in pci_device_add yet because resources
317 * are not assigned yet for some devices.
318 */
Wei Yang7b770612016-03-04 10:53:04 +1100319 pcibios_bus_add_device(dev);
Yinghai Lue253aaf2013-05-07 14:35:44 -0600320 pci_fixup_device(pci_fixup_final, dev);
Yinghai Lu4f535092013-01-21 13:20:52 -0800321 pci_create_sysfs_dev_files(dev);
Yinghai Luef377022013-11-30 14:40:28 -0800322 pci_proc_attach_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Yinghai Lu58d9a382013-01-21 13:20:51 -0800324 dev->match_driver = true;
325 retval = device_attach(&dev->dev);
Lukas Wunner9a2a5a62016-05-02 13:48:31 -0500326 if (retval < 0 && retval != -EPROBE_DEFER) {
Bjorn Helgaasab1a1872016-01-27 07:35:07 -0600327 dev_warn(&dev->dev, "device attach failed (%d)\n", retval);
328 pci_proc_detach_device(dev);
329 pci_remove_sysfs_dev_files(dev);
330 return;
331 }
Yinghai Lu58d9a382013-01-21 13:20:51 -0800332
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800333 dev->is_added = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -0600335EXPORT_SYMBOL_GPL(pci_bus_add_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337/**
Yinghai Lu4f535092013-01-21 13:20:52 -0800338 * pci_bus_add_devices - start driver for PCI devices
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 * @bus: bus to check for new devices
340 *
Yinghai Lu4f535092013-01-21 13:20:52 -0800341 * Start driver for PCI devices and add some sysfs entries.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 */
akpm@linux-foundation.orgc48f1672009-02-03 15:45:26 -0800343void pci_bus_add_devices(const struct pci_bus *bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344{
345 struct pci_dev *dev;
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800346 struct pci_bus *child;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347
348 list_for_each_entry(dev, &bus->devices, bus_list) {
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800349 /* Skip already-added devices */
350 if (dev->is_added)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 continue;
Yijing Wangc893d132014-05-30 11:01:03 +0800352 pci_bus_add_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 }
354
355 list_for_each_entry(dev, &bus->devices, bus_list) {
Lukas Wunner1e398ea2016-05-02 13:48:25 -0500356 /* Skip if device attach failed */
357 if (!dev->is_added)
358 continue;
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800359 child = dev->subordinate;
Jiang Liu981cf9e2013-04-12 05:44:16 +0000360 if (child)
361 pci_bus_add_devices(child);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 }
363}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -0600364EXPORT_SYMBOL(pci_bus_add_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Paul Mackerrascecf4862005-08-18 14:33:01 +1000366/** pci_walk_bus - walk devices on/under bus, calling callback.
367 * @top bus whose devices should be walked
368 * @cb callback to be called for each device found
369 * @userdata arbitrary pointer to be passed to callback.
370 *
371 * Walk the given bus, including any bridged devices
372 * on buses under this bus. Call the provided callback
373 * on each device found.
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800374 *
375 * We check the return of @cb each time. If it returns anything
376 * other than 0, we break out.
377 *
Paul Mackerrascecf4862005-08-18 14:33:01 +1000378 */
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800379void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
Paul Mackerrascecf4862005-08-18 14:33:01 +1000380 void *userdata)
381{
382 struct pci_dev *dev;
383 struct pci_bus *bus;
384 struct list_head *next;
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800385 int retval;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000386
387 bus = top;
Zhang Yanmind71374d2006-06-02 12:35:43 +0800388 down_read(&pci_bus_sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000389 next = top->devices.next;
390 for (;;) {
391 if (next == &bus->devices) {
392 /* end of this bus, go up or finish */
393 if (bus == top)
394 break;
395 next = bus->self->bus_list.next;
396 bus = bus->self->bus;
397 continue;
398 }
399 dev = list_entry(next, struct pci_dev, bus_list);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000400 if (dev->subordinate) {
401 /* this is a pci-pci bridge, do its devices next */
402 next = dev->subordinate->devices.next;
403 bus = dev->subordinate;
404 } else
405 next = dev->bus_list.next;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000406
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800407 retval = cb(dev, userdata);
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800408 if (retval)
409 break;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000410 }
Zhang Yanmind71374d2006-06-02 12:35:43 +0800411 up_read(&pci_bus_sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000412}
Konrad Rzeszutek Wilk7c94def2009-12-22 14:49:45 -0500413EXPORT_SYMBOL_GPL(pci_walk_bus);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000414
Jiang Liufe830ef2013-05-25 21:48:29 +0800415struct pci_bus *pci_bus_get(struct pci_bus *bus)
416{
417 if (bus)
418 get_device(&bus->dev);
419 return bus;
420}
421EXPORT_SYMBOL(pci_bus_get);
422
423void pci_bus_put(struct pci_bus *bus)
424{
425 if (bus)
426 put_device(&bus->dev);
427}
428EXPORT_SYMBOL(pci_bus_put);