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)
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/slab.h>
20 void pci_add_resource_offset(struct list_head *resources, struct resource *res,
21 resource_size_t offset)
23 struct resource_entry *entry;
25 entry = resource_list_create_entry(res, 0);
27 printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
31 entry->offset = offset;
32 resource_list_add_tail(entry, resources);
34 EXPORT_SYMBOL(pci_add_resource_offset);
36 void pci_add_resource(struct list_head *resources, struct resource *res)
38 pci_add_resource_offset(resources, res, 0);
40 EXPORT_SYMBOL(pci_add_resource);
42 void pci_free_resource_list(struct list_head *resources)
44 resource_list_free(resources);
46 EXPORT_SYMBOL(pci_free_resource_list);
48 void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
51 struct pci_bus_resource *bus_res;
53 bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
55 dev_err(&bus->dev, "can't add %pR resource\n", res);
60 bus_res->flags = flags;
61 list_add_tail(&bus_res->list, &bus->resources);
64 struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
66 struct pci_bus_resource *bus_res;
68 if (n < PCI_BRIDGE_RESOURCE_NUM)
69 return bus->resource[n];
71 n -= PCI_BRIDGE_RESOURCE_NUM;
72 list_for_each_entry(bus_res, &bus->resources, list) {
78 EXPORT_SYMBOL_GPL(pci_bus_resource_n);
80 void pci_bus_remove_resources(struct pci_bus *bus)
83 struct pci_bus_resource *bus_res, *tmp;
85 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
86 bus->resource[i] = NULL;
88 list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
89 list_del(&bus_res->list);
94 static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
95 #ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
96 static struct pci_bus_region pci_64_bit = {0,
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};
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.
108 static void pci_clip_resource_to_region(struct pci_bus *bus,
109 struct resource *res,
110 struct pci_bus_region *region)
112 struct pci_bus_region r;
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)
121 res->end = res->start - 1;
123 pcibios_bus_to_resource(bus, res, &r);
126 static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
127 resource_size_t size, resource_size_t align,
128 resource_size_t min, unsigned long type_mask,
129 resource_size_t (*alignf)(void *,
130 const struct resource *,
134 struct pci_bus_region *region)
137 struct resource *r, avail;
140 type_mask |= IORESOURCE_TYPE_BITS;
142 pci_bus_for_each_resource(bus, r, i) {
146 /* type_mask must match */
147 if ((res->flags ^ r->flags) & type_mask)
150 /* We cannot allocate a non-prefetching resource
151 from a pre-fetching area */
152 if ((r->flags & IORESOURCE_PREFETCH) &&
153 !(res->flags & IORESOURCE_PREFETCH))
157 pci_clip_resource_to_region(bus, &avail, region);
160 * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
161 * protect badly documented motherboard resources, but if
162 * this is an already-configured bridge window, its start
170 /* Ok, try it out.. */
171 ret = allocate_resource(r, res, size, min, max,
172 align, alignf, alignf_data);
180 * pci_bus_alloc_resource - allocate a resource from a parent bus
182 * @res: resource to allocate
183 * @size: size of resource to allocate
184 * @align: alignment of resource to allocate
185 * @min: minimum /proc/iomem address to allocate
186 * @type_mask: IORESOURCE_* type flags
187 * @alignf: resource alignment function
188 * @alignf_data: data argument for resource alignment function
190 * Given the PCI bus a device resides on, the size, minimum address,
191 * alignment and type, try to find an acceptable resource allocation
192 * for a specific device resource.
194 int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
195 resource_size_t size, resource_size_t align,
196 resource_size_t min, unsigned long type_mask,
197 resource_size_t (*alignf)(void *,
198 const struct resource *,
203 #ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
206 if (res->flags & IORESOURCE_MEM_64) {
207 rc = pci_bus_alloc_from_region(bus, res, size, align, min,
208 type_mask, alignf, alignf_data,
213 return pci_bus_alloc_from_region(bus, res, size, align, min,
214 type_mask, alignf, alignf_data,
219 return pci_bus_alloc_from_region(bus, res, size, align, min,
220 type_mask, alignf, alignf_data,
223 EXPORT_SYMBOL(pci_bus_alloc_resource);
226 * The @idx resource of @dev should be a PCI-PCI bridge window. If this
227 * resource fits inside a window of an upstream bridge, do nothing. If it
228 * overlaps an upstream window but extends outside it, clip the resource so
229 * it fits completely inside.
231 bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
233 struct pci_bus *bus = dev->bus;
234 struct resource *res = &dev->resource[idx];
235 struct resource orig_res = *res;
239 pci_bus_for_each_resource(bus, r, i) {
240 resource_size_t start, end;
245 if (resource_type(res) != resource_type(r))
248 start = max(r->start, res->start);
249 end = min(r->end, res->end);
252 continue; /* no overlap */
254 if (res->start == start && res->end == end)
255 return false; /* no change */
259 res->flags &= ~IORESOURCE_UNSET;
260 orig_res.flags &= ~IORESOURCE_UNSET;
261 dev_printk(KERN_DEBUG, &dev->dev, "%pR clipped to %pR\n",
270 void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
273 * pci_bus_add_device - start driver for a single device
274 * @dev: device to add
276 * This adds add sysfs entries and start device drivers
278 void pci_bus_add_device(struct pci_dev *dev)
283 * Can not put in pci_device_add yet because resources
284 * are not assigned yet for some devices.
286 pci_fixup_device(pci_fixup_final, dev);
287 pci_create_sysfs_dev_files(dev);
288 pci_proc_attach_device(dev);
290 dev->match_driver = true;
291 retval = device_attach(&dev->dev);
296 EXPORT_SYMBOL_GPL(pci_bus_add_device);
299 * pci_bus_add_devices - start driver for PCI devices
300 * @bus: bus to check for new devices
302 * Start driver for PCI devices and add some sysfs entries.
304 void pci_bus_add_devices(const struct pci_bus *bus)
307 struct pci_bus *child;
309 list_for_each_entry(dev, &bus->devices, bus_list) {
310 /* Skip already-added devices */
313 pci_bus_add_device(dev);
316 list_for_each_entry(dev, &bus->devices, bus_list) {
317 BUG_ON(!dev->is_added);
318 child = dev->subordinate;
320 pci_bus_add_devices(child);
323 EXPORT_SYMBOL(pci_bus_add_devices);
325 /** pci_walk_bus - walk devices on/under bus, calling callback.
326 * @top bus whose devices should be walked
327 * @cb callback to be called for each device found
328 * @userdata arbitrary pointer to be passed to callback.
330 * Walk the given bus, including any bridged devices
331 * on buses under this bus. Call the provided callback
332 * on each device found.
334 * We check the return of @cb each time. If it returns anything
335 * other than 0, we break out.
338 void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
343 struct list_head *next;
347 down_read(&pci_bus_sem);
348 next = top->devices.next;
350 if (next == &bus->devices) {
351 /* end of this bus, go up or finish */
354 next = bus->self->bus_list.next;
355 bus = bus->self->bus;
358 dev = list_entry(next, struct pci_dev, bus_list);
359 if (dev->subordinate) {
360 /* this is a pci-pci bridge, do its devices next */
361 next = dev->subordinate->devices.next;
362 bus = dev->subordinate;
364 next = dev->bus_list.next;
366 retval = cb(dev, userdata);
370 up_read(&pci_bus_sem);
372 EXPORT_SYMBOL_GPL(pci_walk_bus);
374 struct pci_bus *pci_bus_get(struct pci_bus *bus)
377 get_device(&bus->dev);
380 EXPORT_SYMBOL(pci_bus_get);
382 void pci_bus_put(struct pci_bus *bus)
385 put_device(&bus->dev);
387 EXPORT_SYMBOL(pci_bus_put);