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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
Yinghai Luf75b99d2013-12-20 09:57:37 -070094static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
95#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
96static struct pci_bus_region pci_64_bit = {0,
97 (dma_addr_t) 0xffffffffffffffffULL};
Yinghai Lud56dbf52013-12-20 10:55:44 -070098static struct pci_bus_region pci_high = {(dma_addr_t) 0x100000000ULL,
99 (dma_addr_t) 0xffffffffffffffffULL};
Yinghai Luf75b99d2013-12-20 09:57:37 -0700100#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.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 */
Yinghai Luf75b99d2013-12-20 09:57:37 -0700108static 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,
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700127 resource_size_t size, resource_size_t align,
Bjorn Helgaas664c2842014-03-07 13:51:12 -0700128 resource_size_t min, unsigned long type_mask,
Dominik Brodowskib26b2d42010-01-01 17:40:49 +0100129 resource_size_t (*alignf)(void *,
Dominik Brodowski3b7a17f2010-01-01 17:40:50 +0100130 const struct resource *,
Dominik Brodowskib26b2d42010-01-01 17:40:49 +0100131 resource_size_t,
132 resource_size_t),
Yinghai Luf75b99d2013-12-20 09:57:37 -0700133 void *alignf_data,
134 struct pci_bus_region *region)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
Yinghai Luf75b99d2013-12-20 09:57:37 -0700136 int i, ret;
137 struct resource *r, avail;
138 resource_size_t max;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Bjorn Helgaasaa11fc52014-03-07 13:39:01 -0700140 type_mask |= IORESOURCE_TYPE_BITS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
Bjorn Helgaas6db45b72010-12-16 10:38:36 -0700142 pci_bus_for_each_resource(bus, r, i) {
143 if (!r)
144 continue;
145
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 /* type_mask must match */
147 if ((res->flags ^ r->flags) & type_mask)
148 continue;
149
150 /* We cannot allocate a non-prefetching resource
151 from a pre-fetching area */
152 if ((r->flags & IORESOURCE_PREFETCH) &&
153 !(res->flags & IORESOURCE_PREFETCH))
154 continue;
155
Yinghai Luf75b99d2013-12-20 09:57:37 -0700156 avail = *r;
157 pci_clip_resource_to_region(bus, &avail, region);
Yinghai Luf75b99d2013-12-20 09:57:37 -0700158
159 /*
160 * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
161 * protect badly documented motherboard resources, but if
162 * this is an already-configured bridge window, its start
163 * overrides "min".
164 */
165 if (avail.start)
166 min = avail.start;
167
168 max = avail.end;
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 /* Ok, try it out.. */
Yinghai Luf75b99d2013-12-20 09:57:37 -0700171 ret = allocate_resource(r, res, size, min, max,
172 align, alignf, alignf_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 if (ret == 0)
Yinghai Luf75b99d2013-12-20 09:57:37 -0700174 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 }
Yinghai Luf75b99d2013-12-20 09:57:37 -0700176 return -ENOMEM;
177}
178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179/**
180 * pci_bus_alloc_resource - allocate a resource from a parent bus
181 * @bus: PCI bus
182 * @res: resource to allocate
183 * @size: size of resource to allocate
184 * @align: alignment of resource to allocate
185 * @min: minimum /proc/iomem address to allocate
186 * @type_mask: IORESOURCE_* type flags
187 * @alignf: resource alignment function
188 * @alignf_data: data argument for resource alignment function
189 *
190 * Given the PCI bus a device resides on, the size, minimum address,
191 * alignment and type, try to find an acceptable resource allocation
192 * for a specific device resource.
193 */
Yinghai Lud56dbf52013-12-20 10:55:44 -0700194int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 resource_size_t size, resource_size_t align,
Bjorn Helgaas664c2842014-03-07 13:51:12 -0700196 resource_size_t min, unsigned long type_mask,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 resource_size_t (*alignf)(void *,
198 const struct resource *,
199 resource_size_t,
200 resource_size_t),
201 void *alignf_data)
202{
Yinghai Luf75b99d2013-12-20 09:57:37 -0700203#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
Yinghai Lud56dbf52013-12-20 10:55:44 -0700204 int rc;
205
206 if (res->flags & IORESOURCE_MEM_64) {
207 rc = pci_bus_alloc_from_region(bus, res, size, align, min,
208 type_mask, alignf, alignf_data,
209 &pci_high);
210 if (rc == 0)
211 return 0;
212
Yinghai Luf75b99d2013-12-20 09:57:37 -0700213 return pci_bus_alloc_from_region(bus, res, size, align, min,
214 type_mask, alignf, alignf_data,
215 &pci_64_bit);
Yinghai Lud56dbf52013-12-20 10:55:44 -0700216 }
Yinghai Luf75b99d2013-12-20 09:57:37 -0700217#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Yinghai Luf75b99d2013-12-20 09:57:37 -0700219 return pci_bus_alloc_from_region(bus, res, size, align, min,
220 type_mask, alignf, alignf_data,
221 &pci_32_bit);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -0600223EXPORT_SYMBOL(pci_bus_alloc_resource);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Yinghai Lu0f7e7ae2015-01-15 16:21:49 -0600225/*
226 * The @idx resource of @dev should be a PCI-PCI bridge window. If this
227 * resource fits inside a window of an upstream bridge, do nothing. If it
228 * overlaps an upstream window but extends outside it, clip the resource so
229 * it fits completely inside.
230 */
231bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
232{
233 struct pci_bus *bus = dev->bus;
234 struct resource *res = &dev->resource[idx];
235 struct resource orig_res = *res;
236 struct resource *r;
237 int i;
238
239 pci_bus_for_each_resource(bus, r, i) {
240 resource_size_t start, end;
241
242 if (!r)
243 continue;
244
245 if (resource_type(res) != resource_type(r))
246 continue;
247
248 start = max(r->start, res->start);
249 end = min(r->end, res->end);
250
251 if (start > end)
252 continue; /* no overlap */
253
254 if (res->start == start && res->end == end)
255 return false; /* no change */
256
257 res->start = start;
258 res->end = end;
259 dev_printk(KERN_DEBUG, &dev->dev, "%pR clipped to %pR\n",
260 &orig_res, res);
261
262 return true;
263 }
264
265 return false;
266}
267
Yinghai Lu3c449ed2012-11-03 21:39:31 -0700268void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270/**
Yinghai Lu4f535092013-01-21 13:20:52 -0800271 * pci_bus_add_device - start driver for a single device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 * @dev: device to add
273 *
Yinghai Lu4f535092013-01-21 13:20:52 -0800274 * This adds add sysfs entries and start device drivers
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 */
Yijing Wangc893d132014-05-30 11:01:03 +0800276void pci_bus_add_device(struct pci_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700278 int retval;
Myron Stowe735bff12012-07-09 15:36:46 -0600279
Yinghai Lu4f535092013-01-21 13:20:52 -0800280 /*
281 * Can not put in pci_device_add yet because resources
282 * are not assigned yet for some devices.
283 */
Yinghai Lue253aaf2013-05-07 14:35:44 -0600284 pci_fixup_device(pci_fixup_final, dev);
Yinghai Lu4f535092013-01-21 13:20:52 -0800285 pci_create_sysfs_dev_files(dev);
Yinghai Luef377022013-11-30 14:40:28 -0800286 pci_proc_attach_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
Yinghai Lu58d9a382013-01-21 13:20:51 -0800288 dev->match_driver = true;
289 retval = device_attach(&dev->dev);
290 WARN_ON(retval < 0);
291
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800292 dev->is_added = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -0600294EXPORT_SYMBOL_GPL(pci_bus_add_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
296/**
Yinghai Lu4f535092013-01-21 13:20:52 -0800297 * pci_bus_add_devices - start driver for PCI devices
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 * @bus: bus to check for new devices
299 *
Yinghai Lu4f535092013-01-21 13:20:52 -0800300 * Start driver for PCI devices and add some sysfs entries.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 */
akpm@linux-foundation.orgc48f1672009-02-03 15:45:26 -0800302void pci_bus_add_devices(const struct pci_bus *bus)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
304 struct pci_dev *dev;
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800305 struct pci_bus *child;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307 list_for_each_entry(dev, &bus->devices, bus_list) {
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800308 /* Skip already-added devices */
309 if (dev->is_added)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 continue;
Yijing Wangc893d132014-05-30 11:01:03 +0800311 pci_bus_add_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 }
313
314 list_for_each_entry(dev, &bus->devices, bus_list) {
Greg Kroah-Hartman8a1bc902008-02-14 14:56:56 -0800315 BUG_ON(!dev->is_added);
Yu Zhao3fa16fd2008-11-22 02:41:45 +0800316 child = dev->subordinate;
Jiang Liu981cf9e2013-04-12 05:44:16 +0000317 if (child)
318 pci_bus_add_devices(child);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 }
320}
Ryan Desfossesb7fe9432014-04-25 14:32:25 -0600321EXPORT_SYMBOL(pci_bus_add_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
Paul Mackerrascecf4862005-08-18 14:33:01 +1000323/** pci_walk_bus - walk devices on/under bus, calling callback.
324 * @top bus whose devices should be walked
325 * @cb callback to be called for each device found
326 * @userdata arbitrary pointer to be passed to callback.
327 *
328 * Walk the given bus, including any bridged devices
329 * on buses under this bus. Call the provided callback
330 * on each device found.
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800331 *
332 * We check the return of @cb each time. If it returns anything
333 * other than 0, we break out.
334 *
Paul Mackerrascecf4862005-08-18 14:33:01 +1000335 */
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800336void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
Paul Mackerrascecf4862005-08-18 14:33:01 +1000337 void *userdata)
338{
339 struct pci_dev *dev;
340 struct pci_bus *bus;
341 struct list_head *next;
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800342 int retval;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000343
344 bus = top;
Zhang Yanmind71374d2006-06-02 12:35:43 +0800345 down_read(&pci_bus_sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000346 next = top->devices.next;
347 for (;;) {
348 if (next == &bus->devices) {
349 /* end of this bus, go up or finish */
350 if (bus == top)
351 break;
352 next = bus->self->bus_list.next;
353 bus = bus->self->bus;
354 continue;
355 }
356 dev = list_entry(next, struct pci_dev, bus_list);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000357 if (dev->subordinate) {
358 /* this is a pci-pci bridge, do its devices next */
359 next = dev->subordinate->devices.next;
360 bus = dev->subordinate;
361 } else
362 next = dev->bus_list.next;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000363
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800364 retval = cb(dev, userdata);
Zhang, Yanmin70298c62009-06-16 13:34:38 +0800365 if (retval)
366 break;
Paul Mackerrascecf4862005-08-18 14:33:01 +1000367 }
Zhang Yanmind71374d2006-06-02 12:35:43 +0800368 up_read(&pci_bus_sem);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000369}
Konrad Rzeszutek Wilk7c94def2009-12-22 14:49:45 -0500370EXPORT_SYMBOL_GPL(pci_walk_bus);
Paul Mackerrascecf4862005-08-18 14:33:01 +1000371
Jiang Liufe830ef2013-05-25 21:48:29 +0800372struct pci_bus *pci_bus_get(struct pci_bus *bus)
373{
374 if (bus)
375 get_device(&bus->dev);
376 return bus;
377}
378EXPORT_SYMBOL(pci_bus_get);
379
380void pci_bus_put(struct pci_bus *bus)
381{
382 if (bus)
383 put_device(&bus->dev);
384}
385EXPORT_SYMBOL(pci_bus_put);
386