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