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 int devm_request_pci_bus_resources(struct device *dev,
95 struct list_head *resources)
97 struct resource_entry *win;
98 struct resource *parent, *res;
101 resource_list_for_each_entry(win, resources) {
103 switch (resource_type(res)) {
105 parent = &ioport_resource;
108 parent = &iomem_resource;
114 err = devm_request_resource(dev, parent, res);
121 EXPORT_SYMBOL_GPL(devm_request_pci_bus_resources);
123 static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
124 #ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
125 static struct pci_bus_region pci_64_bit = {0,
126 (pci_bus_addr_t) 0xffffffffffffffffULL};
127 static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL,
128 (pci_bus_addr_t) 0xffffffffffffffffULL};
132 * @res contains CPU addresses. Clip it so the corresponding bus addresses
133 * on @bus are entirely within @region. This is used to control the bus
134 * addresses of resources we allocate, e.g., we may need a resource that
135 * can be mapped by a 32-bit BAR.
137 static void pci_clip_resource_to_region(struct pci_bus *bus,
138 struct resource *res,
139 struct pci_bus_region *region)
141 struct pci_bus_region r;
143 pcibios_resource_to_bus(bus, &r, res);
144 if (r.start < region->start)
145 r.start = region->start;
146 if (r.end > region->end)
150 res->end = res->start - 1;
152 pcibios_bus_to_resource(bus, res, &r);
155 static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
156 resource_size_t size, resource_size_t align,
157 resource_size_t min, unsigned long type_mask,
158 resource_size_t (*alignf)(void *,
159 const struct resource *,
163 struct pci_bus_region *region)
166 struct resource *r, avail;
169 type_mask |= IORESOURCE_TYPE_BITS;
171 pci_bus_for_each_resource(bus, r, i) {
172 resource_size_t min_used = min;
177 /* type_mask must match */
178 if ((res->flags ^ r->flags) & type_mask)
181 /* We cannot allocate a non-prefetching resource
182 from a pre-fetching area */
183 if ((r->flags & IORESOURCE_PREFETCH) &&
184 !(res->flags & IORESOURCE_PREFETCH))
188 pci_clip_resource_to_region(bus, &avail, region);
191 * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
192 * protect badly documented motherboard resources, but if
193 * this is an already-configured bridge window, its start
197 min_used = avail.start;
201 /* Ok, try it out.. */
202 ret = allocate_resource(r, res, size, min_used, max,
203 align, alignf, alignf_data);
211 * pci_bus_alloc_resource - allocate a resource from a parent bus
213 * @res: resource to allocate
214 * @size: size of resource to allocate
215 * @align: alignment of resource to allocate
216 * @min: minimum /proc/iomem address to allocate
217 * @type_mask: IORESOURCE_* type flags
218 * @alignf: resource alignment function
219 * @alignf_data: data argument for resource alignment function
221 * Given the PCI bus a device resides on, the size, minimum address,
222 * alignment and type, try to find an acceptable resource allocation
223 * for a specific device resource.
225 int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
226 resource_size_t size, resource_size_t align,
227 resource_size_t min, unsigned long type_mask,
228 resource_size_t (*alignf)(void *,
229 const struct resource *,
234 #ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
237 if (res->flags & IORESOURCE_MEM_64) {
238 rc = pci_bus_alloc_from_region(bus, res, size, align, min,
239 type_mask, alignf, alignf_data,
244 return pci_bus_alloc_from_region(bus, res, size, align, min,
245 type_mask, alignf, alignf_data,
250 return pci_bus_alloc_from_region(bus, res, size, align, min,
251 type_mask, alignf, alignf_data,
254 EXPORT_SYMBOL(pci_bus_alloc_resource);
257 * The @idx resource of @dev should be a PCI-PCI bridge window. If this
258 * resource fits inside a window of an upstream bridge, do nothing. If it
259 * overlaps an upstream window but extends outside it, clip the resource so
260 * it fits completely inside.
262 bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
264 struct pci_bus *bus = dev->bus;
265 struct resource *res = &dev->resource[idx];
266 struct resource orig_res = *res;
270 pci_bus_for_each_resource(bus, r, i) {
271 resource_size_t start, end;
276 if (resource_type(res) != resource_type(r))
279 start = max(r->start, res->start);
280 end = min(r->end, res->end);
283 continue; /* no overlap */
285 if (res->start == start && res->end == end)
286 return false; /* no change */
290 res->flags &= ~IORESOURCE_UNSET;
291 orig_res.flags &= ~IORESOURCE_UNSET;
292 dev_printk(KERN_DEBUG, &dev->dev, "%pR clipped to %pR\n",
301 void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
303 void __weak pcibios_bus_add_device(struct pci_dev *pdev) { }
306 * pci_bus_add_device - start driver for a single device
307 * @dev: device to add
309 * This adds add sysfs entries and start device drivers
311 void pci_bus_add_device(struct pci_dev *dev)
316 * Can not put in pci_device_add yet because resources
317 * are not assigned yet for some devices.
319 pcibios_bus_add_device(dev);
320 pci_fixup_device(pci_fixup_final, dev);
321 pci_create_sysfs_dev_files(dev);
322 pci_proc_attach_device(dev);
323 pci_bridge_d3_update(dev);
325 dev->match_driver = true;
326 retval = device_attach(&dev->dev);
327 if (retval < 0 && retval != -EPROBE_DEFER) {
328 dev_warn(&dev->dev, "device attach failed (%d)\n", retval);
329 pci_proc_detach_device(dev);
330 pci_remove_sysfs_dev_files(dev);
336 EXPORT_SYMBOL_GPL(pci_bus_add_device);
339 * pci_bus_add_devices - start driver for PCI devices
340 * @bus: bus to check for new devices
342 * Start driver for PCI devices and add some sysfs entries.
344 void pci_bus_add_devices(const struct pci_bus *bus)
347 struct pci_bus *child;
349 list_for_each_entry(dev, &bus->devices, bus_list) {
350 /* Skip already-added devices */
353 pci_bus_add_device(dev);
356 list_for_each_entry(dev, &bus->devices, bus_list) {
357 /* Skip if device attach failed */
360 child = dev->subordinate;
362 pci_bus_add_devices(child);
365 EXPORT_SYMBOL(pci_bus_add_devices);
367 /** pci_walk_bus - walk devices on/under bus, calling callback.
368 * @top bus whose devices should be walked
369 * @cb callback to be called for each device found
370 * @userdata arbitrary pointer to be passed to callback.
372 * Walk the given bus, including any bridged devices
373 * on buses under this bus. Call the provided callback
374 * on each device found.
376 * We check the return of @cb each time. If it returns anything
377 * other than 0, we break out.
380 void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
385 struct list_head *next;
389 down_read(&pci_bus_sem);
390 next = top->devices.next;
392 if (next == &bus->devices) {
393 /* end of this bus, go up or finish */
396 next = bus->self->bus_list.next;
397 bus = bus->self->bus;
400 dev = list_entry(next, struct pci_dev, bus_list);
401 if (dev->subordinate) {
402 /* this is a pci-pci bridge, do its devices next */
403 next = dev->subordinate->devices.next;
404 bus = dev->subordinate;
406 next = dev->bus_list.next;
408 retval = cb(dev, userdata);
412 up_read(&pci_bus_sem);
414 EXPORT_SYMBOL_GPL(pci_walk_bus);
416 struct pci_bus *pci_bus_get(struct pci_bus *bus)
419 get_device(&bus->dev);
422 EXPORT_SYMBOL(pci_bus_get);
424 void pci_bus_put(struct pci_bus *bus)
427 put_device(&bus->dev);
429 EXPORT_SYMBOL(pci_bus_put);