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> |
| 16 | #include <linux/init.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 17 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | #include "pci.h" |
| 20 | |
Bjorn Helgaas | 2fe2abf | 2010-02-23 10:24:36 -0700 | [diff] [blame] | 21 | void pci_bus_add_resource(struct pci_bus *bus, struct resource *res, |
| 22 | unsigned int flags) |
| 23 | { |
| 24 | struct pci_bus_resource *bus_res; |
| 25 | |
| 26 | bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL); |
| 27 | if (!bus_res) { |
| 28 | dev_err(&bus->dev, "can't add %pR resource\n", res); |
| 29 | return; |
| 30 | } |
| 31 | |
| 32 | bus_res->res = res; |
| 33 | bus_res->flags = flags; |
| 34 | list_add_tail(&bus_res->list, &bus->resources); |
| 35 | } |
| 36 | |
| 37 | struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n) |
| 38 | { |
| 39 | struct pci_bus_resource *bus_res; |
| 40 | |
| 41 | if (n < PCI_BRIDGE_RESOURCE_NUM) |
| 42 | return bus->resource[n]; |
| 43 | |
| 44 | n -= PCI_BRIDGE_RESOURCE_NUM; |
| 45 | list_for_each_entry(bus_res, &bus->resources, list) { |
| 46 | if (n-- == 0) |
| 47 | return bus_res->res; |
| 48 | } |
| 49 | return NULL; |
| 50 | } |
| 51 | EXPORT_SYMBOL_GPL(pci_bus_resource_n); |
| 52 | |
| 53 | void pci_bus_remove_resources(struct pci_bus *bus) |
| 54 | { |
| 55 | struct pci_bus_resource *bus_res, *tmp; |
| 56 | int i; |
| 57 | |
| 58 | for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) |
| 59 | bus->resource[i] = 0; |
| 60 | |
| 61 | list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) { |
| 62 | list_del(&bus_res->list); |
| 63 | kfree(bus_res); |
| 64 | } |
| 65 | } |
| 66 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | /** |
| 68 | * pci_bus_alloc_resource - allocate a resource from a parent bus |
| 69 | * @bus: PCI bus |
| 70 | * @res: resource to allocate |
| 71 | * @size: size of resource to allocate |
| 72 | * @align: alignment of resource to allocate |
| 73 | * @min: minimum /proc/iomem address to allocate |
| 74 | * @type_mask: IORESOURCE_* type flags |
| 75 | * @alignf: resource alignment function |
| 76 | * @alignf_data: data argument for resource alignment function |
| 77 | * |
| 78 | * Given the PCI bus a device resides on, the size, minimum address, |
| 79 | * alignment and type, try to find an acceptable resource allocation |
| 80 | * for a specific device resource. |
| 81 | */ |
| 82 | int |
| 83 | pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, |
Greg Kroah-Hartman | e31dd6e | 2006-06-12 17:06:02 -0700 | [diff] [blame] | 84 | resource_size_t size, resource_size_t align, |
| 85 | resource_size_t min, unsigned int type_mask, |
Dominik Brodowski | b26b2d4 | 2010-01-01 17:40:49 +0100 | [diff] [blame] | 86 | resource_size_t (*alignf)(void *, |
Dominik Brodowski | 3b7a17f | 2010-01-01 17:40:50 +0100 | [diff] [blame] | 87 | const struct resource *, |
Dominik Brodowski | b26b2d4 | 2010-01-01 17:40:49 +0100 | [diff] [blame] | 88 | resource_size_t, |
| 89 | resource_size_t), |
Greg Kroah-Hartman | e31dd6e | 2006-06-12 17:06:02 -0700 | [diff] [blame] | 90 | void *alignf_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | { |
| 92 | int i, ret = -ENOMEM; |
Bjorn Helgaas | 89a74ec | 2010-02-23 10:24:31 -0700 | [diff] [blame] | 93 | struct resource *r; |
Yinghai Lu | 1f82de1 | 2009-04-23 20:48:32 -0700 | [diff] [blame] | 94 | resource_size_t max = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
| 96 | type_mask |= IORESOURCE_IO | IORESOURCE_MEM; |
| 97 | |
Yinghai Lu | 1f82de1 | 2009-04-23 20:48:32 -0700 | [diff] [blame] | 98 | /* don't allocate too high if the pref mem doesn't support 64bit*/ |
| 99 | if (!(res->flags & IORESOURCE_MEM_64)) |
| 100 | max = PCIBIOS_MAX_MEM_32; |
| 101 | |
Bjorn Helgaas | 89a74ec | 2010-02-23 10:24:31 -0700 | [diff] [blame] | 102 | pci_bus_for_each_resource(bus, r, i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | if (!r) |
| 104 | continue; |
| 105 | |
| 106 | /* type_mask must match */ |
| 107 | if ((res->flags ^ r->flags) & type_mask) |
| 108 | continue; |
| 109 | |
| 110 | /* We cannot allocate a non-prefetching resource |
| 111 | from a pre-fetching area */ |
| 112 | if ((r->flags & IORESOURCE_PREFETCH) && |
| 113 | !(res->flags & IORESOURCE_PREFETCH)) |
| 114 | continue; |
| 115 | |
| 116 | /* Ok, try it out.. */ |
Linus Torvalds | 688d191 | 2005-08-02 14:55:40 -0700 | [diff] [blame] | 117 | ret = allocate_resource(r, res, size, |
| 118 | r->start ? : min, |
Yinghai Lu | 1f82de1 | 2009-04-23 20:48:32 -0700 | [diff] [blame] | 119 | max, align, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | alignf, alignf_data); |
| 121 | if (ret == 0) |
| 122 | break; |
| 123 | } |
| 124 | return ret; |
| 125 | } |
| 126 | |
| 127 | /** |
Yu Zhao | 3fa16fd | 2008-11-22 02:41:45 +0800 | [diff] [blame] | 128 | * pci_bus_add_device - add a single device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | * @dev: device to add |
| 130 | * |
| 131 | * This adds a single pci device to the global |
| 132 | * device list and adds sysfs and procfs entries |
| 133 | */ |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 134 | int pci_bus_add_device(struct pci_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | { |
Greg Kroah-Hartman | b19441a | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 136 | int retval; |
| 137 | retval = device_add(&dev->dev); |
| 138 | if (retval) |
| 139 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
Greg Kroah-Hartman | 8a1bc90 | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 141 | dev->is_added = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | pci_proc_attach_device(dev); |
| 143 | pci_create_sysfs_dev_files(dev); |
Greg Kroah-Hartman | b19441a | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 144 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | /** |
Yu Zhao | 876e501 | 2008-11-22 02:42:35 +0800 | [diff] [blame] | 148 | * pci_bus_add_child - add a child bus |
| 149 | * @bus: bus to add |
| 150 | * |
| 151 | * This adds sysfs entries for a single bus |
| 152 | */ |
| 153 | int pci_bus_add_child(struct pci_bus *bus) |
| 154 | { |
| 155 | int retval; |
| 156 | |
| 157 | if (bus->bridge) |
| 158 | bus->dev.parent = bus->bridge; |
| 159 | |
| 160 | retval = device_register(&bus->dev); |
| 161 | if (retval) |
| 162 | return retval; |
| 163 | |
| 164 | bus->is_added = 1; |
| 165 | |
| 166 | retval = device_create_file(&bus->dev, &dev_attr_cpuaffinity); |
| 167 | if (retval) |
| 168 | return retval; |
| 169 | |
| 170 | retval = device_create_file(&bus->dev, &dev_attr_cpulistaffinity); |
| 171 | |
| 172 | /* Create legacy_io and legacy_mem files for this bus */ |
| 173 | pci_create_legacy_files(bus); |
| 174 | |
| 175 | return retval; |
| 176 | } |
| 177 | |
| 178 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | * pci_bus_add_devices - insert newly discovered PCI devices |
| 180 | * @bus: bus to check for new devices |
| 181 | * |
| 182 | * Add newly discovered PCI devices (which are on the bus->devices |
| 183 | * list) to the global PCI device list, add the sysfs and procfs |
| 184 | * entries. Where a bridge is found, add the discovered bus to |
| 185 | * the parents list of child buses, and recurse (breadth-first |
| 186 | * to be compatible with 2.4) |
| 187 | * |
| 188 | * Call hotplug for each new devices. |
| 189 | */ |
akpm@linux-foundation.org | c48f167 | 2009-02-03 15:45:26 -0800 | [diff] [blame] | 190 | void pci_bus_add_devices(const struct pci_bus *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | { |
| 192 | struct pci_dev *dev; |
Yu Zhao | 3fa16fd | 2008-11-22 02:41:45 +0800 | [diff] [blame] | 193 | struct pci_bus *child; |
Greg Kroah-Hartman | b19441a | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 194 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
| 196 | list_for_each_entry(dev, &bus->devices, bus_list) { |
Greg Kroah-Hartman | 8a1bc90 | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 197 | /* Skip already-added devices */ |
| 198 | if (dev->is_added) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | continue; |
Greg Kroah-Hartman | b19441a | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 200 | retval = pci_bus_add_device(dev); |
| 201 | if (retval) |
| 202 | dev_err(&dev->dev, "Error adding device, continuing\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | list_for_each_entry(dev, &bus->devices, bus_list) { |
Greg Kroah-Hartman | 8a1bc90 | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 206 | BUG_ON(!dev->is_added); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
Yu Zhao | 3fa16fd | 2008-11-22 02:41:45 +0800 | [diff] [blame] | 208 | child = dev->subordinate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | /* |
| 210 | * If there is an unattached subordinate bus, attach |
| 211 | * it and then scan for unattached PCI devices. |
| 212 | */ |
Yu Zhao | 3fa16fd | 2008-11-22 02:41:45 +0800 | [diff] [blame] | 213 | if (!child) |
| 214 | continue; |
| 215 | if (list_empty(&child->node)) { |
| 216 | down_write(&pci_bus_sem); |
| 217 | list_add_tail(&child->node, &dev->bus->children); |
| 218 | up_write(&pci_bus_sem); |
| 219 | } |
| 220 | pci_bus_add_devices(child); |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 221 | |
Yu Zhao | 3fa16fd | 2008-11-22 02:41:45 +0800 | [diff] [blame] | 222 | /* |
| 223 | * register the bus with sysfs as the parent is now |
| 224 | * properly registered. |
| 225 | */ |
| 226 | if (child->is_added) |
| 227 | continue; |
Yu Zhao | 876e501 | 2008-11-22 02:42:35 +0800 | [diff] [blame] | 228 | retval = pci_bus_add_child(child); |
Yu Zhao | 3fa16fd | 2008-11-22 02:41:45 +0800 | [diff] [blame] | 229 | if (retval) |
Yu Zhao | 876e501 | 2008-11-22 02:42:35 +0800 | [diff] [blame] | 230 | dev_err(&dev->dev, "Error adding bus, continuing\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | } |
| 232 | } |
| 233 | |
| 234 | void pci_enable_bridges(struct pci_bus *bus) |
| 235 | { |
| 236 | struct pci_dev *dev; |
Greg Kroah-Hartman | 95a6296 | 2005-07-28 11:37:33 -0700 | [diff] [blame] | 237 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
| 239 | list_for_each_entry(dev, &bus->devices, bus_list) { |
| 240 | if (dev->subordinate) { |
Yuji Shimada | 296ccb0 | 2009-04-03 16:41:46 +0900 | [diff] [blame] | 241 | if (!pci_is_enabled(dev)) { |
Alex Chiang | 9dd90ca | 2009-03-20 14:56:20 -0600 | [diff] [blame] | 242 | retval = pci_enable_device(dev); |
| 243 | pci_set_master(dev); |
| 244 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | pci_enable_bridges(dev->subordinate); |
| 246 | } |
| 247 | } |
| 248 | } |
| 249 | |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 250 | /** pci_walk_bus - walk devices on/under bus, calling callback. |
| 251 | * @top bus whose devices should be walked |
| 252 | * @cb callback to be called for each device found |
| 253 | * @userdata arbitrary pointer to be passed to callback. |
| 254 | * |
| 255 | * Walk the given bus, including any bridged devices |
| 256 | * on buses under this bus. Call the provided callback |
| 257 | * on each device found. |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 258 | * |
| 259 | * We check the return of @cb each time. If it returns anything |
| 260 | * other than 0, we break out. |
| 261 | * |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 262 | */ |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 263 | 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] | 264 | void *userdata) |
| 265 | { |
| 266 | struct pci_dev *dev; |
| 267 | struct pci_bus *bus; |
| 268 | struct list_head *next; |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 269 | int retval; |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 270 | |
| 271 | bus = top; |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 272 | down_read(&pci_bus_sem); |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 273 | next = top->devices.next; |
| 274 | for (;;) { |
| 275 | if (next == &bus->devices) { |
| 276 | /* end of this bus, go up or finish */ |
| 277 | if (bus == top) |
| 278 | break; |
| 279 | next = bus->self->bus_list.next; |
| 280 | bus = bus->self->bus; |
| 281 | continue; |
| 282 | } |
| 283 | dev = list_entry(next, struct pci_dev, bus_list); |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 284 | if (dev->subordinate) { |
| 285 | /* this is a pci-pci bridge, do its devices next */ |
| 286 | next = dev->subordinate->devices.next; |
| 287 | bus = dev->subordinate; |
| 288 | } else |
| 289 | next = dev->bus_list.next; |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 290 | |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 291 | /* Run device routines with the device locked */ |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 292 | device_lock(&dev->dev); |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 293 | retval = cb(dev, userdata); |
Greg Kroah-Hartman | 8e9394c | 2010-02-17 10:57:05 -0800 | [diff] [blame] | 294 | device_unlock(&dev->dev); |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 295 | if (retval) |
| 296 | break; |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 297 | } |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 298 | up_read(&pci_bus_sem); |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 299 | } |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 300 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | EXPORT_SYMBOL(pci_bus_alloc_resource); |
| 302 | EXPORT_SYMBOL_GPL(pci_bus_add_device); |
| 303 | EXPORT_SYMBOL(pci_bus_add_devices); |
| 304 | EXPORT_SYMBOL(pci_enable_bridges); |