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> |
| 17 | |
| 18 | #include "pci.h" |
| 19 | |
| 20 | /** |
| 21 | * pci_bus_alloc_resource - allocate a resource from a parent bus |
| 22 | * @bus: PCI bus |
| 23 | * @res: resource to allocate |
| 24 | * @size: size of resource to allocate |
| 25 | * @align: alignment of resource to allocate |
| 26 | * @min: minimum /proc/iomem address to allocate |
| 27 | * @type_mask: IORESOURCE_* type flags |
| 28 | * @alignf: resource alignment function |
| 29 | * @alignf_data: data argument for resource alignment function |
| 30 | * |
| 31 | * Given the PCI bus a device resides on, the size, minimum address, |
| 32 | * alignment and type, try to find an acceptable resource allocation |
| 33 | * for a specific device resource. |
| 34 | */ |
| 35 | int |
| 36 | pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res, |
Greg Kroah-Hartman | e31dd6e | 2006-06-12 17:06:02 -0700 | [diff] [blame] | 37 | resource_size_t size, resource_size_t align, |
| 38 | resource_size_t min, unsigned int type_mask, |
| 39 | void (*alignf)(void *, struct resource *, resource_size_t, |
| 40 | resource_size_t), |
| 41 | void *alignf_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | { |
| 43 | int i, ret = -ENOMEM; |
| 44 | |
| 45 | type_mask |= IORESOURCE_IO | IORESOURCE_MEM; |
| 46 | |
| 47 | for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) { |
| 48 | struct resource *r = bus->resource[i]; |
| 49 | if (!r) |
| 50 | continue; |
| 51 | |
| 52 | /* type_mask must match */ |
| 53 | if ((res->flags ^ r->flags) & type_mask) |
| 54 | continue; |
| 55 | |
| 56 | /* We cannot allocate a non-prefetching resource |
| 57 | from a pre-fetching area */ |
| 58 | if ((r->flags & IORESOURCE_PREFETCH) && |
| 59 | !(res->flags & IORESOURCE_PREFETCH)) |
| 60 | continue; |
| 61 | |
| 62 | /* Ok, try it out.. */ |
Linus Torvalds | 688d191 | 2005-08-02 14:55:40 -0700 | [diff] [blame] | 63 | ret = allocate_resource(r, res, size, |
| 64 | r->start ? : min, |
| 65 | -1, align, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | alignf, alignf_data); |
| 67 | if (ret == 0) |
| 68 | break; |
| 69 | } |
| 70 | return ret; |
| 71 | } |
| 72 | |
| 73 | /** |
Yu Zhao | 3fa16fd | 2008-11-22 02:41:45 +0800 | [diff] [blame] | 74 | * pci_bus_add_device - add a single device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | * @dev: device to add |
| 76 | * |
| 77 | * This adds a single pci device to the global |
| 78 | * device list and adds sysfs and procfs entries |
| 79 | */ |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 80 | int pci_bus_add_device(struct pci_dev *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | { |
Greg Kroah-Hartman | b19441a | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 82 | int retval; |
| 83 | retval = device_add(&dev->dev); |
| 84 | if (retval) |
| 85 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
Greg Kroah-Hartman | 8a1bc90 | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 87 | dev->is_added = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | pci_proc_attach_device(dev); |
| 89 | pci_create_sysfs_dev_files(dev); |
Greg Kroah-Hartman | b19441a | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 90 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | } |
| 92 | |
| 93 | /** |
Yu Zhao | 876e501 | 2008-11-22 02:42:35 +0800 | [diff] [blame] | 94 | * pci_bus_add_child - add a child bus |
| 95 | * @bus: bus to add |
| 96 | * |
| 97 | * This adds sysfs entries for a single bus |
| 98 | */ |
| 99 | int pci_bus_add_child(struct pci_bus *bus) |
| 100 | { |
| 101 | int retval; |
| 102 | |
| 103 | if (bus->bridge) |
| 104 | bus->dev.parent = bus->bridge; |
| 105 | |
| 106 | retval = device_register(&bus->dev); |
| 107 | if (retval) |
| 108 | return retval; |
| 109 | |
| 110 | bus->is_added = 1; |
| 111 | |
| 112 | retval = device_create_file(&bus->dev, &dev_attr_cpuaffinity); |
| 113 | if (retval) |
| 114 | return retval; |
| 115 | |
| 116 | retval = device_create_file(&bus->dev, &dev_attr_cpulistaffinity); |
| 117 | |
| 118 | /* Create legacy_io and legacy_mem files for this bus */ |
| 119 | pci_create_legacy_files(bus); |
| 120 | |
| 121 | return retval; |
| 122 | } |
| 123 | |
| 124 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | * pci_bus_add_devices - insert newly discovered PCI devices |
| 126 | * @bus: bus to check for new devices |
| 127 | * |
| 128 | * Add newly discovered PCI devices (which are on the bus->devices |
| 129 | * list) to the global PCI device list, add the sysfs and procfs |
| 130 | * entries. Where a bridge is found, add the discovered bus to |
| 131 | * the parents list of child buses, and recurse (breadth-first |
| 132 | * to be compatible with 2.4) |
| 133 | * |
| 134 | * Call hotplug for each new devices. |
| 135 | */ |
Sam Ravnborg | 96bde06 | 2007-03-26 21:53:30 -0800 | [diff] [blame] | 136 | void pci_bus_add_devices(struct pci_bus *bus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
| 138 | struct pci_dev *dev; |
Yu Zhao | 3fa16fd | 2008-11-22 02:41:45 +0800 | [diff] [blame] | 139 | struct pci_bus *child; |
Greg Kroah-Hartman | b19441a | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 140 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
| 142 | list_for_each_entry(dev, &bus->devices, bus_list) { |
Greg Kroah-Hartman | 8a1bc90 | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 143 | /* Skip already-added devices */ |
| 144 | if (dev->is_added) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | continue; |
Greg Kroah-Hartman | b19441a | 2006-08-28 11:43:25 -0700 | [diff] [blame] | 146 | retval = pci_bus_add_device(dev); |
| 147 | if (retval) |
| 148 | dev_err(&dev->dev, "Error adding device, continuing\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | } |
| 150 | |
| 151 | list_for_each_entry(dev, &bus->devices, bus_list) { |
Greg Kroah-Hartman | 8a1bc90 | 2008-02-14 14:56:56 -0800 | [diff] [blame] | 152 | BUG_ON(!dev->is_added); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
Yu Zhao | 3fa16fd | 2008-11-22 02:41:45 +0800 | [diff] [blame] | 154 | child = dev->subordinate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | /* |
| 156 | * If there is an unattached subordinate bus, attach |
| 157 | * it and then scan for unattached PCI devices. |
| 158 | */ |
Yu Zhao | 3fa16fd | 2008-11-22 02:41:45 +0800 | [diff] [blame] | 159 | if (!child) |
| 160 | continue; |
| 161 | if (list_empty(&child->node)) { |
| 162 | down_write(&pci_bus_sem); |
| 163 | list_add_tail(&child->node, &dev->bus->children); |
| 164 | up_write(&pci_bus_sem); |
| 165 | } |
| 166 | pci_bus_add_devices(child); |
Greg Kroah-Hartman | fd7d1ce | 2007-05-22 22:47:54 -0400 | [diff] [blame] | 167 | |
Yu Zhao | 3fa16fd | 2008-11-22 02:41:45 +0800 | [diff] [blame] | 168 | /* |
| 169 | * register the bus with sysfs as the parent is now |
| 170 | * properly registered. |
| 171 | */ |
| 172 | if (child->is_added) |
| 173 | continue; |
Yu Zhao | 876e501 | 2008-11-22 02:42:35 +0800 | [diff] [blame] | 174 | retval = pci_bus_add_child(child); |
Yu Zhao | 3fa16fd | 2008-11-22 02:41:45 +0800 | [diff] [blame] | 175 | if (retval) |
Yu Zhao | 876e501 | 2008-11-22 02:42:35 +0800 | [diff] [blame] | 176 | dev_err(&dev->dev, "Error adding bus, continuing\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | } |
| 178 | } |
| 179 | |
| 180 | void pci_enable_bridges(struct pci_bus *bus) |
| 181 | { |
| 182 | struct pci_dev *dev; |
Greg Kroah-Hartman | 95a6296 | 2005-07-28 11:37:33 -0700 | [diff] [blame] | 183 | int retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | |
| 185 | list_for_each_entry(dev, &bus->devices, bus_list) { |
| 186 | if (dev->subordinate) { |
Greg Kroah-Hartman | 95a6296 | 2005-07-28 11:37:33 -0700 | [diff] [blame] | 187 | retval = pci_enable_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | pci_set_master(dev); |
| 189 | pci_enable_bridges(dev->subordinate); |
| 190 | } |
| 191 | } |
| 192 | } |
| 193 | |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 194 | /** pci_walk_bus - walk devices on/under bus, calling callback. |
| 195 | * @top bus whose devices should be walked |
| 196 | * @cb callback to be called for each device found |
| 197 | * @userdata arbitrary pointer to be passed to callback. |
| 198 | * |
| 199 | * Walk the given bus, including any bridged devices |
| 200 | * on buses under this bus. Call the provided callback |
| 201 | * on each device found. |
| 202 | */ |
| 203 | void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *), |
| 204 | void *userdata) |
| 205 | { |
| 206 | struct pci_dev *dev; |
| 207 | struct pci_bus *bus; |
| 208 | struct list_head *next; |
| 209 | |
| 210 | bus = top; |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 211 | down_read(&pci_bus_sem); |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 212 | next = top->devices.next; |
| 213 | for (;;) { |
| 214 | if (next == &bus->devices) { |
| 215 | /* end of this bus, go up or finish */ |
| 216 | if (bus == top) |
| 217 | break; |
| 218 | next = bus->self->bus_list.next; |
| 219 | bus = bus->self->bus; |
| 220 | continue; |
| 221 | } |
| 222 | dev = list_entry(next, struct pci_dev, bus_list); |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 223 | if (dev->subordinate) { |
| 224 | /* this is a pci-pci bridge, do its devices next */ |
| 225 | next = dev->subordinate->devices.next; |
| 226 | bus = dev->subordinate; |
| 227 | } else |
| 228 | next = dev->bus_list.next; |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 229 | |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 230 | /* Run device routines with the device locked */ |
| 231 | down(&dev->dev.sem); |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 232 | cb(dev, userdata); |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 233 | up(&dev->dev.sem); |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 234 | } |
Zhang Yanmin | d71374d | 2006-06-02 12:35:43 +0800 | [diff] [blame] | 235 | up_read(&pci_bus_sem); |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 236 | } |
Paul Mackerras | cecf486 | 2005-08-18 14:33:01 +1000 | [diff] [blame] | 237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | EXPORT_SYMBOL(pci_bus_alloc_resource); |
| 239 | EXPORT_SYMBOL_GPL(pci_bus_add_device); |
| 240 | EXPORT_SYMBOL(pci_bus_add_devices); |
| 241 | EXPORT_SYMBOL(pci_enable_bridges); |