Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 16 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | #include "pci.h" |
| 19 | |
Bjorn Helgaas | 0efd5aa | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 20 | void pci_add_resource_offset(struct list_head *resources, struct resource *res, |
| 21 | resource_size_t offset) |
Bjorn Helgaas | 45ca9e9 | 2011-10-28 16:25:35 -0600 | [diff] [blame] | 22 | { |
Jiang Liu | 14d76b6 | 2015-02-05 13:44:44 +0800 | [diff] [blame] | 23 | struct resource_entry *entry; |
Bjorn Helgaas | 45ca9e9 | 2011-10-28 16:25:35 -0600 | [diff] [blame] | 24 | |
Jiang Liu | 14d76b6 | 2015-02-05 13:44:44 +0800 | [diff] [blame] | 25 | entry = resource_list_create_entry(res, 0); |
| 26 | if (!entry) { |
Bjorn Helgaas | 0efd5aa | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 27 | printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res); |
Bjorn Helgaas | 45ca9e9 | 2011-10-28 16:25:35 -0600 | [diff] [blame] | 28 | return; |
| 29 | } |
| 30 | |
Jiang Liu | 14d76b6 | 2015-02-05 13:44:44 +0800 | [diff] [blame] | 31 | entry->offset = offset; |
| 32 | resource_list_add_tail(entry, resources); |
Bjorn Helgaas | 0efd5aa | 2012-02-23 20:19:00 -0700 | [diff] [blame] | 33 | } |
| 34 | EXPORT_SYMBOL(pci_add_resource_offset); |
| 35 | |
| 36 | void pci_add_resource(struct list_head *resources, struct resource *res) |
| 37 | { |
| 38 | pci_add_resource_offset(resources, res, 0); |
Bjorn Helgaas | 45ca9e9 | 2011-10-28 16:25:35 -0600 | [diff] [blame] | 39 | } |
| 40 | EXPORT_SYMBOL(pci_add_resource); |
| 41 | |
| 42 | void pci_free_resource_list(struct list_head *resources) |
| 43 | { |
Jiang Liu | 14d76b6 | 2015-02-05 13:44:44 +0800 | [diff] [blame] | 44 | resource_list_free(resources); |
Bjorn Helgaas | 45ca9e9 | 2011-10-28 16:25:35 -0600 | [diff] [blame] | 45 | } |
| 46 | EXPORT_SYMBOL(pci_free_resource_list); |
| 47 | |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 48 | void 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 | |
| 64 | struct 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 | } |
| 78 | EXPORT_SYMBOL_GPL(pci_bus_resource_n); |
| 79 | |
| 80 | void pci_bus_remove_resources(struct pci_bus *bus) |
| 81 | { |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 82 | int i; |
Yinghai Lu | 817a268 | 2012-09-14 17:48:41 -0700 | [diff] [blame] | 83 | struct pci_bus_resource *bus_res, *tmp; |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 84 | |
| 85 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) |
Stephen Hemminger | 7736a05 | 2010-06-01 09:00:16 -0700 | [diff] [blame] | 86 | bus->resource[i] = NULL; |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 87 | |
Yinghai Lu | 817a268 | 2012-09-14 17:48:41 -0700 | [diff] [blame] | 88 | list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) { |
| 89 | list_del(&bus_res->list); |
| 90 | kfree(bus_res); |
| 91 | } |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 92 | } |
| 93 | |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 94 | static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL}; |
Yinghai Lu | 3a9ad0b | 2015-05-27 17:23:51 -0700 | [diff] [blame] | 95 | #ifdef CONFIG_PCI_BUS_ADDR_T_64BIT |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 96 | static struct pci_bus_region pci_64_bit = {0, |
Yinghai Lu | 3a9ad0b | 2015-05-27 17:23:51 -0700 | [diff] [blame] | 97 | (pci_bus_addr_t) 0xffffffffffffffffULL}; |
| 98 | static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL, |
| 99 | (pci_bus_addr_t) 0xffffffffffffffffULL}; |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | */ |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 108 | static 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 | |
| 126 | static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res, |
Greg Kroah-Hartman | e31dd6e | 2006-06-12 17:06:02 -0700 | [diff] [blame] | 127 | resource_size_t size, resource_size_t align, |
Bjorn Helgaas | 664c284 | 2014-03-07 13:51:12 -0700 | [diff] [blame] | 128 | resource_size_t min, unsigned long type_mask, |
Dominik Brodowski | b26b2d4 | 2010-01-01 17:40:49 +0100 | [diff] [blame] | 129 | resource_size_t (*alignf)(void *, |
Dominik Brodowski | 3b7a17f | 2010-01-01 17:40:50 +0100 | [diff] [blame] | 130 | const struct resource *, |
Dominik Brodowski | b26b2d4 | 2010-01-01 17:40:49 +0100 | [diff] [blame] | 131 | resource_size_t, |
| 132 | resource_size_t), |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 133 | void *alignf_data, |
| 134 | struct pci_bus_region *region) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | { |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 136 | int i, ret; |
| 137 | struct resource *r, avail; |
| 138 | resource_size_t max; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
Bjorn Helgaas | aa11fc5 | 2014-03-07 13:39:01 -0700 | [diff] [blame] | 140 | type_mask |= IORESOURCE_TYPE_BITS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
Bjorn Helgaas | 6db45b7 | 2010-12-16 10:38:36 -0700 | [diff] [blame] | 142 | pci_bus_for_each_resource(bus, r, i) { |
Christoph Biedl | 3460baa | 2015-12-23 16:51:57 +0100 | [diff] [blame] | 143 | resource_size_t min_used = min; |
| 144 | |
Bjorn Helgaas | 6db45b7 | 2010-12-16 10:38:36 -0700 | [diff] [blame] | 145 | if (!r) |
| 146 | continue; |
| 147 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 158 | avail = *r; |
| 159 | pci_clip_resource_to_region(bus, &avail, region); |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 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) |
Christoph Biedl | 3460baa | 2015-12-23 16:51:57 +0100 | [diff] [blame] | 168 | min_used = avail.start; |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 169 | |
| 170 | max = avail.end; |
| 171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | /* Ok, try it out.. */ |
Christoph Biedl | 3460baa | 2015-12-23 16:51:57 +0100 | [diff] [blame] | 173 | ret = allocate_resource(r, res, size, min_used, max, |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 174 | align, alignf, alignf_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | if (ret == 0) |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 176 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | } |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 178 | return -ENOMEM; |
| 179 | } |
| 180 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Yinghai Lu | d56dbf5 | 2013-12-20 10:55:44 -0700 | [diff] [blame] | 196 | int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | resource_size_t size, resource_size_t align, |
Bjorn Helgaas | 664c284 | 2014-03-07 13:51:12 -0700 | [diff] [blame] | 198 | resource_size_t min, unsigned long type_mask, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | resource_size_t (*alignf)(void *, |
| 200 | const struct resource *, |
| 201 | resource_size_t, |
| 202 | resource_size_t), |
| 203 | void *alignf_data) |
| 204 | { |
Yinghai Lu | 3a9ad0b | 2015-05-27 17:23:51 -0700 | [diff] [blame] | 205 | #ifdef CONFIG_PCI_BUS_ADDR_T_64BIT |
Yinghai Lu | d56dbf5 | 2013-12-20 10:55:44 -0700 | [diff] [blame] | 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 | |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 215 | return pci_bus_alloc_from_region(bus, res, size, align, min, |
| 216 | type_mask, alignf, alignf_data, |
| 217 | &pci_64_bit); |
Yinghai Lu | d56dbf5 | 2013-12-20 10:55:44 -0700 | [diff] [blame] | 218 | } |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 219 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | |
Yinghai Lu | f75b99d | 2013-12-20 09:57:37 -0700 | [diff] [blame] | 221 | return pci_bus_alloc_from_region(bus, res, size, align, min, |
| 222 | type_mask, alignf, alignf_data, |
| 223 | &pci_32_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | } |
Ryan Desfosses | b7fe943 | 2014-04-25 14:32:25 -0600 | [diff] [blame] | 225 | EXPORT_SYMBOL(pci_bus_alloc_resource); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
Yinghai Lu | 0f7e7ae | 2015-01-15 16:21:49 -0600 | [diff] [blame] | 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 | */ |
| 233 | bool 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; |
Bjorn Helgaas | b838b39 | 2015-09-22 17:03:54 -0500 | [diff] [blame] | 261 | res->flags &= ~IORESOURCE_UNSET; |
| 262 | orig_res.flags &= ~IORESOURCE_UNSET; |
Yinghai Lu | 0f7e7ae | 2015-01-15 16:21:49 -0600 | [diff] [blame] | 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 | |
Yinghai Lu | 3c449ed | 2012-11-03 21:39:31 -0700 | [diff] [blame] | 272 | void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { } |
| 273 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | /** |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 275 | * pci_bus_add_device - start driver for a single device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | * @dev: device to add |
| 277 | * |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 278 | * This adds add sysfs entries and start device drivers |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | */ |
Yijing Wang | c893d13 | 2014-05-30 11:01:03 +0800 | [diff] [blame] | 280 | void pci_bus_add_device(struct pci_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | { |
Greg Kroah-Hartman | b19441a | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 282 | int retval; |
Myron Stowe | 735bff1 | 2012-07-09 15:36:46 -0600 | [diff] [blame] | 283 | |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 284 | /* |
| 285 | * Can not put in pci_device_add yet because resources |
| 286 | * are not assigned yet for some devices. |
| 287 | */ |
Yinghai Lu | e253aaf | 2013-05-07 14:35:44 -0600 | [diff] [blame] | 288 | pci_fixup_device(pci_fixup_final, dev); |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 289 | pci_create_sysfs_dev_files(dev); |
Yinghai Lu | ef37702 | 2013-11-30 14:40:28 -0800 | [diff] [blame] | 290 | pci_proc_attach_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
Yinghai Lu | 58d9a38 | 2013-01-21 13:20:51 -0800 | [diff] [blame] | 292 | dev->match_driver = true; |
| 293 | retval = device_attach(&dev->dev); |
| 294 | WARN_ON(retval < 0); |
| 295 | |
Greg Kroah-Hartman | 8a1bc90 | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 296 | dev->is_added = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | } |
Ryan Desfosses | b7fe943 | 2014-04-25 14:32:25 -0600 | [diff] [blame] | 298 | EXPORT_SYMBOL_GPL(pci_bus_add_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
| 300 | /** |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 301 | * pci_bus_add_devices - start driver for PCI devices |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | * @bus: bus to check for new devices |
| 303 | * |
Yinghai Lu | 4f53509 | 2013-01-21 13:20:52 -0800 | [diff] [blame] | 304 | * Start driver for PCI devices and add some sysfs entries. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | */ |
akpm@linux-foundation.org | c48f167 | 2009-02-03 15:45:26 -0800 | [diff] [blame] | 306 | void pci_bus_add_devices(const struct pci_bus *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | { |
| 308 | struct pci_dev *dev; |
Yu Zhao | 3fa16fd | 2008-11-22 02:41:45 +0800 | [diff] [blame] | 309 | struct pci_bus *child; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | |
| 311 | list_for_each_entry(dev, &bus->devices, bus_list) { |
Greg Kroah-Hartman | 8a1bc90 | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 312 | /* Skip already-added devices */ |
| 313 | if (dev->is_added) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | continue; |
Yijing Wang | c893d13 | 2014-05-30 11:01:03 +0800 | [diff] [blame] | 315 | pci_bus_add_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | } |
| 317 | |
| 318 | list_for_each_entry(dev, &bus->devices, bus_list) { |
Greg Kroah-Hartman | 8a1bc90 | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 319 | BUG_ON(!dev->is_added); |
Yu Zhao | 3fa16fd | 2008-11-22 02:41:45 +0800 | [diff] [blame] | 320 | child = dev->subordinate; |
Jiang Liu | 981cf9e | 2013-04-12 05:44:16 +0000 | [diff] [blame] | 321 | if (child) |
| 322 | pci_bus_add_devices(child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | } |
| 324 | } |
Ryan Desfosses | b7fe943 | 2014-04-25 14:32:25 -0600 | [diff] [blame] | 325 | EXPORT_SYMBOL(pci_bus_add_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 327 | /** pci_walk_bus - walk devices on/under bus, calling callback. |
| 328 | * @top bus whose devices should be walked |
| 329 | * @cb callback to be called for each device found |
| 330 | * @userdata arbitrary pointer to be passed to callback. |
| 331 | * |
| 332 | * Walk the given bus, including any bridged devices |
| 333 | * on buses under this bus. Call the provided callback |
| 334 | * on each device found. |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 335 | * |
| 336 | * We check the return of @cb each time. If it returns anything |
| 337 | * other than 0, we break out. |
| 338 | * |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 339 | */ |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 340 | void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 341 | void *userdata) |
| 342 | { |
| 343 | struct pci_dev *dev; |
| 344 | struct pci_bus *bus; |
| 345 | struct list_head *next; |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 346 | int retval; |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 347 | |
| 348 | bus = top; |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 349 | down_read(&pci_bus_sem); |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 350 | next = top->devices.next; |
| 351 | for (;;) { |
| 352 | if (next == &bus->devices) { |
| 353 | /* end of this bus, go up or finish */ |
| 354 | if (bus == top) |
| 355 | break; |
| 356 | next = bus->self->bus_list.next; |
| 357 | bus = bus->self->bus; |
| 358 | continue; |
| 359 | } |
| 360 | dev = list_entry(next, struct pci_dev, bus_list); |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 361 | if (dev->subordinate) { |
| 362 | /* this is a pci-pci bridge, do its devices next */ |
| 363 | next = dev->subordinate->devices.next; |
| 364 | bus = dev->subordinate; |
| 365 | } else |
| 366 | next = dev->bus_list.next; |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 367 | |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 368 | retval = cb(dev, userdata); |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 369 | if (retval) |
| 370 | break; |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 371 | } |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 372 | up_read(&pci_bus_sem); |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 373 | } |
Konrad Rzeszutek Wilk | 7c94def | 2009-12-22 14:49:45 -0500 | [diff] [blame] | 374 | EXPORT_SYMBOL_GPL(pci_walk_bus); |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 375 | |
Jiang Liu | fe830ef | 2013-05-25 21:48:29 +0800 | [diff] [blame] | 376 | struct pci_bus *pci_bus_get(struct pci_bus *bus) |
| 377 | { |
| 378 | if (bus) |
| 379 | get_device(&bus->dev); |
| 380 | return bus; |
| 381 | } |
| 382 | EXPORT_SYMBOL(pci_bus_get); |
| 383 | |
| 384 | void pci_bus_put(struct pci_bus *bus) |
| 385 | { |
| 386 | if (bus) |
| 387 | put_device(&bus->dev); |
| 388 | } |
| 389 | EXPORT_SYMBOL(pci_bus_put); |
| 390 | |