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> 17 #include <linux/slab.h> 18 19 #include "pci.h" 20 21 void pci_add_resource_offset(struct list_head *resources, struct resource *res, 22 resource_size_t offset) 23 { 24 struct pci_host_bridge_window *window; 25 26 window = kzalloc(sizeof(struct pci_host_bridge_window), GFP_KERNEL); 27 if (!window) { 28 printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res); 29 return; 30 } 31 32 window->res = res; 33 window->offset = offset; 34 list_add_tail(&window->list, resources); 35 } 36 EXPORT_SYMBOL(pci_add_resource_offset); 37 38 void pci_add_resource(struct list_head *resources, struct resource *res) 39 { 40 pci_add_resource_offset(resources, res, 0); 41 } 42 EXPORT_SYMBOL(pci_add_resource); 43 44 void pci_free_resource_list(struct list_head *resources) 45 { 46 struct pci_host_bridge_window *window, *tmp; 47 48 list_for_each_entry_safe(window, tmp, resources, list) { 49 list_del(&window->list); 50 kfree(window); 51 } 52 } 53 EXPORT_SYMBOL(pci_free_resource_list); 54 55 void pci_bus_add_resource(struct pci_bus *bus, struct resource *res, 56 unsigned int flags) 57 { 58 struct pci_bus_resource *bus_res; 59 60 bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL); 61 if (!bus_res) { 62 dev_err(&bus->dev, "can't add %pR resource\n", res); 63 return; 64 } 65 66 bus_res->res = res; 67 bus_res->flags = flags; 68 list_add_tail(&bus_res->list, &bus->resources); 69 } 70 71 struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n) 72 { 73 struct pci_bus_resource *bus_res; 74 75 if (n < PCI_BRIDGE_RESOURCE_NUM) 76 return bus->resource[n]; 77 78 n -= PCI_BRIDGE_RESOURCE_NUM; 79 list_for_each_entry(bus_res, &bus->resources, list) { 80 if (n-- == 0) 81 return bus_res->res; 82 } 83 return NULL; 84 } 85 EXPORT_SYMBOL_GPL(pci_bus_resource_n); 86 87 void pci_bus_remove_resources(struct pci_bus *bus) 88 { 89 int i; 90 struct pci_bus_resource *bus_res, *tmp; 91 92 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) 93 bus->resource[i] = NULL; 94 95 list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) { 96 list_del(&bus_res->list); 97 kfree(bus_res); 98 } 99 } 100 101 /** 102 * pci_bus_alloc_resource - allocate a resource from a parent bus 103 * @bus: PCI bus 104 * @res: resource to allocate 105 * @size: size of resource to allocate 106 * @align: alignment of resource to allocate 107 * @min: minimum /proc/iomem address to allocate 108 * @type_mask: IORESOURCE_* type flags 109 * @alignf: resource alignment function 110 * @alignf_data: data argument for resource alignment function 111 * 112 * Given the PCI bus a device resides on, the size, minimum address, 113 * alignment and type, try to find an acceptable resource allocation 114 * for a specific device resource. 115 */ 116 int 117 pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, 118 resource_size_t size, resource_size_t align, 119 resource_size_t min, unsigned int type_mask, 120 resource_size_t (*alignf)(void *, 121 const struct resource *, 122 resource_size_t, 123 resource_size_t), 124 void *alignf_data) 125 { 126 int i, ret = -ENOMEM; 127 struct resource *r; 128 resource_size_t max = -1; 129 130 type_mask |= IORESOURCE_IO | IORESOURCE_MEM; 131 132 /* don't allocate too high if the pref mem doesn't support 64bit*/ 133 if (!(res->flags & IORESOURCE_MEM_64)) 134 max = PCIBIOS_MAX_MEM_32; 135 136 pci_bus_for_each_resource(bus, r, i) { 137 if (!r) 138 continue; 139 140 /* type_mask must match */ 141 if ((res->flags ^ r->flags) & type_mask) 142 continue; 143 144 /* We cannot allocate a non-prefetching resource 145 from a pre-fetching area */ 146 if ((r->flags & IORESOURCE_PREFETCH) && 147 !(res->flags & IORESOURCE_PREFETCH)) 148 continue; 149 150 /* Ok, try it out.. */ 151 ret = allocate_resource(r, res, size, 152 r->start ? : min, 153 max, align, 154 alignf, alignf_data); 155 if (ret == 0) 156 break; 157 } 158 return ret; 159 } 160 161 /** 162 * pci_bus_add_device - add a single device 163 * @dev: device to add 164 * 165 * This adds a single pci device to the global 166 * device list and adds sysfs and procfs entries 167 */ 168 int pci_bus_add_device(struct pci_dev *dev) 169 { 170 int retval; 171 172 pci_fixup_device(pci_fixup_final, dev); 173 174 retval = pcibios_add_device(dev); 175 if (retval) 176 return retval; 177 178 retval = device_add(&dev->dev); 179 if (retval) 180 return retval; 181 182 dev->is_added = 1; 183 pci_proc_attach_device(dev); 184 pci_create_sysfs_dev_files(dev); 185 return 0; 186 } 187 188 /** 189 * pci_bus_add_child - add a child bus 190 * @bus: bus to add 191 * 192 * This adds sysfs entries for a single bus 193 */ 194 int pci_bus_add_child(struct pci_bus *bus) 195 { 196 int retval; 197 198 if (bus->bridge) 199 bus->dev.parent = bus->bridge; 200 201 retval = device_register(&bus->dev); 202 if (retval) 203 return retval; 204 205 bus->is_added = 1; 206 207 /* Create legacy_io and legacy_mem files for this bus */ 208 pci_create_legacy_files(bus); 209 210 return retval; 211 } 212 213 /** 214 * pci_bus_add_devices - insert newly discovered PCI devices 215 * @bus: bus to check for new devices 216 * 217 * Add newly discovered PCI devices (which are on the bus->devices 218 * list) to the global PCI device list, add the sysfs and procfs 219 * entries. Where a bridge is found, add the discovered bus to 220 * the parents list of child buses, and recurse (breadth-first 221 * to be compatible with 2.4) 222 * 223 * Call hotplug for each new devices. 224 */ 225 void pci_bus_add_devices(const struct pci_bus *bus) 226 { 227 struct pci_dev *dev; 228 struct pci_bus *child; 229 int retval; 230 231 list_for_each_entry(dev, &bus->devices, bus_list) { 232 /* Skip already-added devices */ 233 if (dev->is_added) 234 continue; 235 retval = pci_bus_add_device(dev); 236 if (retval) 237 dev_err(&dev->dev, "Error adding device, continuing\n"); 238 } 239 240 list_for_each_entry(dev, &bus->devices, bus_list) { 241 BUG_ON(!dev->is_added); 242 243 child = dev->subordinate; 244 /* 245 * If there is an unattached subordinate bus, attach 246 * it and then scan for unattached PCI devices. 247 */ 248 if (!child) 249 continue; 250 if (list_empty(&child->node)) { 251 down_write(&pci_bus_sem); 252 list_add_tail(&child->node, &dev->bus->children); 253 up_write(&pci_bus_sem); 254 } 255 pci_bus_add_devices(child); 256 257 /* 258 * register the bus with sysfs as the parent is now 259 * properly registered. 260 */ 261 if (child->is_added) 262 continue; 263 retval = pci_bus_add_child(child); 264 if (retval) 265 dev_err(&dev->dev, "Error adding bus, continuing\n"); 266 } 267 } 268 269 void pci_enable_bridges(struct pci_bus *bus) 270 { 271 struct pci_dev *dev; 272 int retval; 273 274 list_for_each_entry(dev, &bus->devices, bus_list) { 275 if (dev->subordinate) { 276 if (!pci_is_enabled(dev)) { 277 retval = pci_enable_device(dev); 278 if (retval) 279 dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval); 280 pci_set_master(dev); 281 } 282 pci_enable_bridges(dev->subordinate); 283 } 284 } 285 } 286 287 /** pci_walk_bus - walk devices on/under bus, calling callback. 288 * @top bus whose devices should be walked 289 * @cb callback to be called for each device found 290 * @userdata arbitrary pointer to be passed to callback. 291 * 292 * Walk the given bus, including any bridged devices 293 * on buses under this bus. Call the provided callback 294 * on each device found. 295 * 296 * We check the return of @cb each time. If it returns anything 297 * other than 0, we break out. 298 * 299 */ 300 void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *), 301 void *userdata) 302 { 303 struct pci_dev *dev; 304 struct pci_bus *bus; 305 struct list_head *next; 306 int retval; 307 308 bus = top; 309 down_read(&pci_bus_sem); 310 next = top->devices.next; 311 for (;;) { 312 if (next == &bus->devices) { 313 /* end of this bus, go up or finish */ 314 if (bus == top) 315 break; 316 next = bus->self->bus_list.next; 317 bus = bus->self->bus; 318 continue; 319 } 320 dev = list_entry(next, struct pci_dev, bus_list); 321 if (dev->subordinate) { 322 /* this is a pci-pci bridge, do its devices next */ 323 next = dev->subordinate->devices.next; 324 bus = dev->subordinate; 325 } else 326 next = dev->bus_list.next; 327 328 retval = cb(dev, userdata); 329 if (retval) 330 break; 331 } 332 up_read(&pci_bus_sem); 333 } 334 EXPORT_SYMBOL_GPL(pci_walk_bus); 335 336 EXPORT_SYMBOL(pci_bus_alloc_resource); 337 EXPORT_SYMBOL_GPL(pci_bus_add_device); 338 EXPORT_SYMBOL(pci_bus_add_devices); 339 EXPORT_SYMBOL(pci_enable_bridges); 340