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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#include <linux/slab.h>
18
19#include "pci.h"
20
21void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
22 unsigned int flags)
23{
24 struct pci_bus_resource *bus_res;
25
26 bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
27 if (!bus_res) {
28 dev_err(&bus->dev, "can't add %pR resource\n", res);
29 return;
30 }
31
32 bus_res->res = res;
33 bus_res->flags = flags;
34 list_add_tail(&bus_res->list, &bus->resources);
35}
36
37struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
38{
39 struct pci_bus_resource *bus_res;
40
41 if (n < PCI_BRIDGE_RESOURCE_NUM)
42 return bus->resource[n];
43
44 n -= PCI_BRIDGE_RESOURCE_NUM;
45 list_for_each_entry(bus_res, &bus->resources, list) {
46 if (n-- == 0)
47 return bus_res->res;
48 }
49 return NULL;
50}
51EXPORT_SYMBOL_GPL(pci_bus_resource_n);
52
53void pci_bus_remove_resources(struct pci_bus *bus)
54{
55 struct pci_bus_resource *bus_res, *tmp;
56 int i;
57
58 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
59 bus->resource[i] = NULL;
60
61 list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
62 list_del(&bus_res->list);
63 kfree(bus_res);
64 }
65}
66
67/**
68 * pci_bus_alloc_resource - allocate a resource from a parent bus
69 * @bus: PCI bus
70 * @res: resource to allocate
71 * @size: size of resource to allocate
72 * @align: alignment of resource to allocate
73 * @min: minimum /proc/iomem address to allocate
74 * @type_mask: IORESOURCE_* type flags
75 * @alignf: resource alignment function
76 * @alignf_data: data argument for resource alignment function
77 *
78 * Given the PCI bus a device resides on, the size, minimum address,
79 * alignment and type, try to find an acceptable resource allocation
80 * for a specific device resource.
81 */
82int
83pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
84 resource_size_t size, resource_size_t align,
85 resource_size_t min, unsigned int type_mask,
86 resource_size_t (*alignf)(void *,
87 const struct resource *,
88 resource_size_t,
89 resource_size_t),
90 void *alignf_data)
91{
92 int i, ret = -ENOMEM;
93 struct resource *r;
94 resource_size_t max = -1;
95
96 type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
97
98 /* don't allocate too high if the pref mem doesn't support 64bit*/
99 if (!(res->flags & IORESOURCE_MEM_64))
100 max = PCIBIOS_MAX_MEM_32;
101
102 pci_bus_for_each_resource(bus, r, i) {
103 if (!r)
104 continue;
105
106 /* type_mask must match */
107 if ((res->flags ^ r->flags) & type_mask)
108 continue;
109
110 /* We cannot allocate a non-prefetching resource
111 from a pre-fetching area */
112 if ((r->flags & IORESOURCE_PREFETCH) &&
113 !(res->flags & IORESOURCE_PREFETCH))
114 continue;
115
116 /* Ok, try it out.. */
117 ret = allocate_resource(r, res, size,
118 r->start ? : min,
119 max, align,
120 alignf, alignf_data);
121 if (ret == 0)
122 break;
123 }
124 return ret;
125}
126
127/**
128 * pci_bus_add_device - add a single device
129 * @dev: device to add
130 *
131 * This adds a single pci device to the global
132 * device list and adds sysfs and procfs entries
133 */
134int pci_bus_add_device(struct pci_dev *dev)
135{
136 int retval;
137 retval = device_add(&dev->dev);
138 if (retval)
139 return retval;
140
141 dev->is_added = 1;
142 pci_proc_attach_device(dev);
143 pci_create_sysfs_dev_files(dev);
144 return 0;
145}
146
147/**
148 * pci_bus_add_child - add a child bus
149 * @bus: bus to add
150 *
151 * This adds sysfs entries for a single bus
152 */
153int pci_bus_add_child(struct pci_bus *bus)
154{
155 int retval;
156
157 if (bus->bridge)
158 bus->dev.parent = bus->bridge;
159
160 retval = device_register(&bus->dev);
161 if (retval)
162 return retval;
163
164 bus->is_added = 1;
165
166 /* Create legacy_io and legacy_mem files for this bus */
167 pci_create_legacy_files(bus);
168
169 return retval;
170}
171
172/**
173 * pci_bus_add_devices - insert newly discovered PCI devices
174 * @bus: bus to check for new devices
175 *
176 * Add newly discovered PCI devices (which are on the bus->devices
177 * list) to the global PCI device list, add the sysfs and procfs
178 * entries. Where a bridge is found, add the discovered bus to
179 * the parents list of child buses, and recurse (breadth-first
180 * to be compatible with 2.4)
181 *
182 * Call hotplug for each new devices.
183 */
184void pci_bus_add_devices(const struct pci_bus *bus)
185{
186 struct pci_dev *dev;
187 struct pci_bus *child;
188 int retval;
189
190 list_for_each_entry(dev, &bus->devices, bus_list) {
191 /* Skip already-added devices */
192 if (dev->is_added)
193 continue;
194 retval = pci_bus_add_device(dev);
195 if (retval)
196 dev_err(&dev->dev, "Error adding device, continuing\n");
197 }
198
199 list_for_each_entry(dev, &bus->devices, bus_list) {
200 BUG_ON(!dev->is_added);
201
202 child = dev->subordinate;
203 /*
204 * If there is an unattached subordinate bus, attach
205 * it and then scan for unattached PCI devices.
206 */
207 if (!child)
208 continue;
209 if (list_empty(&child->node)) {
210 down_write(&pci_bus_sem);
211 list_add_tail(&child->node, &dev->bus->children);
212 up_write(&pci_bus_sem);
213 }
214 pci_bus_add_devices(child);
215
216 /*
217 * register the bus with sysfs as the parent is now
218 * properly registered.
219 */
220 if (child->is_added)
221 continue;
222 retval = pci_bus_add_child(child);
223 if (retval)
224 dev_err(&dev->dev, "Error adding bus, continuing\n");
225 }
226}
227
228void pci_enable_bridges(struct pci_bus *bus)
229{
230 struct pci_dev *dev;
231 int retval;
232
233 list_for_each_entry(dev, &bus->devices, bus_list) {
234 if (dev->subordinate) {
235 if (!pci_is_enabled(dev)) {
236 retval = pci_enable_device(dev);
237 if (retval)
238 dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval);
239 pci_set_master(dev);
240 }
241 pci_enable_bridges(dev->subordinate);
242 }
243 }
244}
245
246/** pci_walk_bus - walk devices on/under bus, calling callback.
247 * @top bus whose devices should be walked
248 * @cb callback to be called for each device found
249 * @userdata arbitrary pointer to be passed to callback.
250 *
251 * Walk the given bus, including any bridged devices
252 * on buses under this bus. Call the provided callback
253 * on each device found.
254 *
255 * We check the return of @cb each time. If it returns anything
256 * other than 0, we break out.
257 *
258 */
259void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
260 void *userdata)
261{
262 struct pci_dev *dev;
263 struct pci_bus *bus;
264 struct list_head *next;
265 int retval;
266
267 bus = top;
268 down_read(&pci_bus_sem);
269 next = top->devices.next;
270 for (;;) {
271 if (next == &bus->devices) {
272 /* end of this bus, go up or finish */
273 if (bus == top)
274 break;
275 next = bus->self->bus_list.next;
276 bus = bus->self->bus;
277 continue;
278 }
279 dev = list_entry(next, struct pci_dev, bus_list);
280 if (dev->subordinate) {
281 /* this is a pci-pci bridge, do its devices next */
282 next = dev->subordinate->devices.next;
283 bus = dev->subordinate;
284 } else
285 next = dev->bus_list.next;
286
287 /* Run device routines with the device locked */
288 device_lock(&dev->dev);
289 retval = cb(dev, userdata);
290 device_unlock(&dev->dev);
291 if (retval)
292 break;
293 }
294 up_read(&pci_bus_sem);
295}
296EXPORT_SYMBOL_GPL(pci_walk_bus);
297
298EXPORT_SYMBOL(pci_bus_alloc_resource);
299EXPORT_SYMBOL_GPL(pci_bus_add_device);
300EXPORT_SYMBOL(pci_bus_add_devices);
301EXPORT_SYMBOL(pci_enable_bridges);
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#include <linux/slab.h>
18
19#include "pci.h"
20
21void pci_add_resource_offset(struct list_head *resources, struct resource *res,
22 resource_size_t offset)
23{
24 struct pci_host_bridge_window *window;
25
26 window = kzalloc(sizeof(struct pci_host_bridge_window), GFP_KERNEL);
27 if (!window) {
28 printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
29 return;
30 }
31
32 window->res = res;
33 window->offset = offset;
34 list_add_tail(&window->list, resources);
35}
36EXPORT_SYMBOL(pci_add_resource_offset);
37
38void pci_add_resource(struct list_head *resources, struct resource *res)
39{
40 pci_add_resource_offset(resources, res, 0);
41}
42EXPORT_SYMBOL(pci_add_resource);
43
44void pci_free_resource_list(struct list_head *resources)
45{
46 struct pci_host_bridge_window *window, *tmp;
47
48 list_for_each_entry_safe(window, tmp, resources, list) {
49 list_del(&window->list);
50 kfree(window);
51 }
52}
53EXPORT_SYMBOL(pci_free_resource_list);
54
55void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
56 unsigned int flags)
57{
58 struct pci_bus_resource *bus_res;
59
60 bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
61 if (!bus_res) {
62 dev_err(&bus->dev, "can't add %pR resource\n", res);
63 return;
64 }
65
66 bus_res->res = res;
67 bus_res->flags = flags;
68 list_add_tail(&bus_res->list, &bus->resources);
69}
70
71struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
72{
73 struct pci_bus_resource *bus_res;
74
75 if (n < PCI_BRIDGE_RESOURCE_NUM)
76 return bus->resource[n];
77
78 n -= PCI_BRIDGE_RESOURCE_NUM;
79 list_for_each_entry(bus_res, &bus->resources, list) {
80 if (n-- == 0)
81 return bus_res->res;
82 }
83 return NULL;
84}
85EXPORT_SYMBOL_GPL(pci_bus_resource_n);
86
87void pci_bus_remove_resources(struct pci_bus *bus)
88{
89 int i;
90 struct pci_bus_resource *bus_res, *tmp;
91
92 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
93 bus->resource[i] = NULL;
94
95 list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
96 list_del(&bus_res->list);
97 kfree(bus_res);
98 }
99}
100
101static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
102#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
103static struct pci_bus_region pci_64_bit = {0,
104 (dma_addr_t) 0xffffffffffffffffULL};
105static struct pci_bus_region pci_high = {(dma_addr_t) 0x100000000ULL,
106 (dma_addr_t) 0xffffffffffffffffULL};
107#endif
108
109/*
110 * @res contains CPU addresses. Clip it so the corresponding bus addresses
111 * on @bus are entirely within @region. This is used to control the bus
112 * addresses of resources we allocate, e.g., we may need a resource that
113 * can be mapped by a 32-bit BAR.
114 */
115static void pci_clip_resource_to_region(struct pci_bus *bus,
116 struct resource *res,
117 struct pci_bus_region *region)
118{
119 struct pci_bus_region r;
120
121 pcibios_resource_to_bus(bus, &r, res);
122 if (r.start < region->start)
123 r.start = region->start;
124 if (r.end > region->end)
125 r.end = region->end;
126
127 if (r.end < r.start)
128 res->end = res->start - 1;
129 else
130 pcibios_bus_to_resource(bus, res, &r);
131}
132
133static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
134 resource_size_t size, resource_size_t align,
135 resource_size_t min, unsigned long type_mask,
136 resource_size_t (*alignf)(void *,
137 const struct resource *,
138 resource_size_t,
139 resource_size_t),
140 void *alignf_data,
141 struct pci_bus_region *region)
142{
143 int i, ret;
144 struct resource *r, avail;
145 resource_size_t max;
146
147 type_mask |= IORESOURCE_TYPE_BITS;
148
149 pci_bus_for_each_resource(bus, r, i) {
150 if (!r)
151 continue;
152
153 /* type_mask must match */
154 if ((res->flags ^ r->flags) & type_mask)
155 continue;
156
157 /* We cannot allocate a non-prefetching resource
158 from a pre-fetching area */
159 if ((r->flags & IORESOURCE_PREFETCH) &&
160 !(res->flags & IORESOURCE_PREFETCH))
161 continue;
162
163 avail = *r;
164 pci_clip_resource_to_region(bus, &avail, region);
165
166 /*
167 * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
168 * protect badly documented motherboard resources, but if
169 * this is an already-configured bridge window, its start
170 * overrides "min".
171 */
172 if (avail.start)
173 min = avail.start;
174
175 max = avail.end;
176
177 /* Ok, try it out.. */
178 ret = allocate_resource(r, res, size, min, max,
179 align, alignf, alignf_data);
180 if (ret == 0)
181 return 0;
182 }
183 return -ENOMEM;
184}
185
186/**
187 * pci_bus_alloc_resource - allocate a resource from a parent bus
188 * @bus: PCI bus
189 * @res: resource to allocate
190 * @size: size of resource to allocate
191 * @align: alignment of resource to allocate
192 * @min: minimum /proc/iomem address to allocate
193 * @type_mask: IORESOURCE_* type flags
194 * @alignf: resource alignment function
195 * @alignf_data: data argument for resource alignment function
196 *
197 * Given the PCI bus a device resides on, the size, minimum address,
198 * alignment and type, try to find an acceptable resource allocation
199 * for a specific device resource.
200 */
201int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
202 resource_size_t size, resource_size_t align,
203 resource_size_t min, unsigned long type_mask,
204 resource_size_t (*alignf)(void *,
205 const struct resource *,
206 resource_size_t,
207 resource_size_t),
208 void *alignf_data)
209{
210#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
211 int rc;
212
213 if (res->flags & IORESOURCE_MEM_64) {
214 rc = pci_bus_alloc_from_region(bus, res, size, align, min,
215 type_mask, alignf, alignf_data,
216 &pci_high);
217 if (rc == 0)
218 return 0;
219
220 return pci_bus_alloc_from_region(bus, res, size, align, min,
221 type_mask, alignf, alignf_data,
222 &pci_64_bit);
223 }
224#endif
225
226 return pci_bus_alloc_from_region(bus, res, size, align, min,
227 type_mask, alignf, alignf_data,
228 &pci_32_bit);
229}
230
231void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
232
233/**
234 * pci_bus_add_device - start driver for a single device
235 * @dev: device to add
236 *
237 * This adds add sysfs entries and start device drivers
238 */
239int pci_bus_add_device(struct pci_dev *dev)
240{
241 int retval;
242
243 /*
244 * Can not put in pci_device_add yet because resources
245 * are not assigned yet for some devices.
246 */
247 pci_fixup_device(pci_fixup_final, dev);
248 pci_create_sysfs_dev_files(dev);
249 pci_proc_attach_device(dev);
250
251 dev->match_driver = true;
252 retval = device_attach(&dev->dev);
253 WARN_ON(retval < 0);
254
255 dev->is_added = 1;
256
257 return 0;
258}
259
260/**
261 * pci_bus_add_devices - start driver for PCI devices
262 * @bus: bus to check for new devices
263 *
264 * Start driver for PCI devices and add some sysfs entries.
265 */
266void pci_bus_add_devices(const struct pci_bus *bus)
267{
268 struct pci_dev *dev;
269 struct pci_bus *child;
270 int retval;
271
272 list_for_each_entry(dev, &bus->devices, bus_list) {
273 /* Skip already-added devices */
274 if (dev->is_added)
275 continue;
276 retval = pci_bus_add_device(dev);
277 if (retval)
278 dev_err(&dev->dev, "Error adding device (%d)\n",
279 retval);
280 }
281
282 list_for_each_entry(dev, &bus->devices, bus_list) {
283 BUG_ON(!dev->is_added);
284 child = dev->subordinate;
285 if (child)
286 pci_bus_add_devices(child);
287 }
288}
289
290/** pci_walk_bus - walk devices on/under bus, calling callback.
291 * @top bus whose devices should be walked
292 * @cb callback to be called for each device found
293 * @userdata arbitrary pointer to be passed to callback.
294 *
295 * Walk the given bus, including any bridged devices
296 * on buses under this bus. Call the provided callback
297 * on each device found.
298 *
299 * We check the return of @cb each time. If it returns anything
300 * other than 0, we break out.
301 *
302 */
303void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
304 void *userdata)
305{
306 struct pci_dev *dev;
307 struct pci_bus *bus;
308 struct list_head *next;
309 int retval;
310
311 bus = top;
312 down_read(&pci_bus_sem);
313 next = top->devices.next;
314 for (;;) {
315 if (next == &bus->devices) {
316 /* end of this bus, go up or finish */
317 if (bus == top)
318 break;
319 next = bus->self->bus_list.next;
320 bus = bus->self->bus;
321 continue;
322 }
323 dev = list_entry(next, struct pci_dev, bus_list);
324 if (dev->subordinate) {
325 /* this is a pci-pci bridge, do its devices next */
326 next = dev->subordinate->devices.next;
327 bus = dev->subordinate;
328 } else
329 next = dev->bus_list.next;
330
331 retval = cb(dev, userdata);
332 if (retval)
333 break;
334 }
335 up_read(&pci_bus_sem);
336}
337EXPORT_SYMBOL_GPL(pci_walk_bus);
338
339struct pci_bus *pci_bus_get(struct pci_bus *bus)
340{
341 if (bus)
342 get_device(&bus->dev);
343 return bus;
344}
345EXPORT_SYMBOL(pci_bus_get);
346
347void pci_bus_put(struct pci_bus *bus)
348{
349 if (bus)
350 put_device(&bus->dev);
351}
352EXPORT_SYMBOL(pci_bus_put);
353
354EXPORT_SYMBOL(pci_bus_alloc_resource);
355EXPORT_SYMBOL_GPL(pci_bus_add_device);
356EXPORT_SYMBOL(pci_bus_add_devices);