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) {
143 resource_size_t min_used = min;
148 /* type_mask must match */
149 if ((res->flags ^ r->flags) & type_mask)
152 /* We cannot allocate a non-prefetching resource
153 from a pre-fetching area */
154 if ((r->flags & IORESOURCE_PREFETCH) &&
155 !(res->flags & IORESOURCE_PREFETCH))
159 pci_clip_resource_to_region(bus, &avail, region);
162 * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
163 * protect badly documented motherboard resources, but if
164 * this is an already-configured bridge window, its start
168 min_used = avail.start;
172 /* Ok, try it out.. */
173 ret = allocate_resource(r, res, size, min_used, max,
174 align, alignf, alignf_data);
182 * pci_bus_alloc_resource - allocate a resource from a parent bus
184 * @res: resource to allocate
185 * @size: size of resource to allocate
186 * @align: alignment of resource to allocate
187 * @min: minimum /proc/iomem address to allocate
188 * @type_mask: IORESOURCE_* type flags
189 * @alignf: resource alignment function
190 * @alignf_data: data argument for resource alignment function
192 * Given the PCI bus a device resides on, the size, minimum address,
193 * alignment and type, try to find an acceptable resource allocation
194 * for a specific device resource.
196 int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
197 resource_size_t size, resource_size_t align,
198 resource_size_t min, unsigned long type_mask,
199 resource_size_t (*alignf)(void *,
200 const struct resource *,
205 #ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
208 if (res->flags & IORESOURCE_MEM_64) {
209 rc = pci_bus_alloc_from_region(bus, res, size, align, min,
210 type_mask, alignf, alignf_data,
215 return pci_bus_alloc_from_region(bus, res, size, align, min,
216 type_mask, alignf, alignf_data,
221 return pci_bus_alloc_from_region(bus, res, size, align, min,
222 type_mask, alignf, alignf_data,
225 EXPORT_SYMBOL(pci_bus_alloc_resource);
228 * The @idx resource of @dev should be a PCI-PCI bridge window. If this
229 * resource fits inside a window of an upstream bridge, do nothing. If it
230 * overlaps an upstream window but extends outside it, clip the resource so
231 * it fits completely inside.
233 bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
235 struct pci_bus *bus = dev->bus;
236 struct resource *res = &dev->resource[idx];
237 struct resource orig_res = *res;
241 pci_bus_for_each_resource(bus, r, i) {
242 resource_size_t start, end;
247 if (resource_type(res) != resource_type(r))
250 start = max(r->start, res->start);
251 end = min(r->end, res->end);
254 continue; /* no overlap */
256 if (res->start == start && res->end == end)
257 return false; /* no change */
261 res->flags &= ~IORESOURCE_UNSET;
262 orig_res.flags &= ~IORESOURCE_UNSET;
263 dev_printk(KERN_DEBUG, &dev->dev, "%pR clipped to %pR\n",
272 void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
274 void __weak pcibios_bus_add_device(struct pci_dev *pdev) { }
277 * pci_bus_add_device - start driver for a single device
278 * @dev: device to add
280 * This adds add sysfs entries and start device drivers
282 void pci_bus_add_device(struct pci_dev *dev)
287 * Can not put in pci_device_add yet because resources
288 * are not assigned yet for some devices.
290 pcibios_bus_add_device(dev);
291 pci_fixup_device(pci_fixup_final, dev);
292 pci_create_sysfs_dev_files(dev);
293 pci_proc_attach_device(dev);
294 pci_bridge_d3_device_changed(dev);
296 dev->match_driver = true;
297 retval = device_attach(&dev->dev);
298 if (retval < 0 && retval != -EPROBE_DEFER) {
299 dev_warn(&dev->dev, "device attach failed (%d)\n", retval);
300 pci_proc_detach_device(dev);
301 pci_remove_sysfs_dev_files(dev);
307 EXPORT_SYMBOL_GPL(pci_bus_add_device);
310 * pci_bus_add_devices - start driver for PCI devices
311 * @bus: bus to check for new devices
313 * Start driver for PCI devices and add some sysfs entries.
315 void pci_bus_add_devices(const struct pci_bus *bus)
318 struct pci_bus *child;
320 list_for_each_entry(dev, &bus->devices, bus_list) {
321 /* Skip already-added devices */
324 pci_bus_add_device(dev);
327 list_for_each_entry(dev, &bus->devices, bus_list) {
328 /* Skip if device attach failed */
331 child = dev->subordinate;
333 pci_bus_add_devices(child);
336 EXPORT_SYMBOL(pci_bus_add_devices);
338 /** pci_walk_bus - walk devices on/under bus, calling callback.
339 * @top bus whose devices should be walked
340 * @cb callback to be called for each device found
341 * @userdata arbitrary pointer to be passed to callback.
343 * Walk the given bus, including any bridged devices
344 * on buses under this bus. Call the provided callback
345 * on each device found.
347 * We check the return of @cb each time. If it returns anything
348 * other than 0, we break out.
351 void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
356 struct list_head *next;
360 down_read(&pci_bus_sem);
361 next = top->devices.next;
363 if (next == &bus->devices) {
364 /* end of this bus, go up or finish */
367 next = bus->self->bus_list.next;
368 bus = bus->self->bus;
371 dev = list_entry(next, struct pci_dev, bus_list);
372 if (dev->subordinate) {
373 /* this is a pci-pci bridge, do its devices next */
374 next = dev->subordinate->devices.next;
375 bus = dev->subordinate;
377 next = dev->bus_list.next;
379 retval = cb(dev, userdata);
383 up_read(&pci_bus_sem);
385 EXPORT_SYMBOL_GPL(pci_walk_bus);
387 struct pci_bus *pci_bus_get(struct pci_bus *bus)
390 get_device(&bus->dev);
393 EXPORT_SYMBOL(pci_bus_get);
395 void pci_bus_put(struct pci_bus *bus)
398 put_device(&bus->dev);
400 EXPORT_SYMBOL(pci_bus_put);