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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_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
91 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
92 bus->resource[i] = NULL;
93
94 pci_free_resource_list(&bus->resources);
95}
96
97/**
98 * pci_bus_alloc_resource - allocate a resource from a parent bus
99 * @bus: PCI bus
100 * @res: resource to allocate
101 * @size: size of resource to allocate
102 * @align: alignment of resource to allocate
103 * @min: minimum /proc/iomem address to allocate
104 * @type_mask: IORESOURCE_* type flags
105 * @alignf: resource alignment function
106 * @alignf_data: data argument for resource alignment function
107 *
108 * Given the PCI bus a device resides on, the size, minimum address,
109 * alignment and type, try to find an acceptable resource allocation
110 * for a specific device resource.
111 */
112int
113pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
114 resource_size_t size, resource_size_t align,
115 resource_size_t min, unsigned int type_mask,
116 resource_size_t (*alignf)(void *,
117 const struct resource *,
118 resource_size_t,
119 resource_size_t),
120 void *alignf_data)
121{
122 int i, ret = -ENOMEM;
123 struct resource *r;
124 resource_size_t max = -1;
125
126 type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
127
128 /* don't allocate too high if the pref mem doesn't support 64bit*/
129 if (!(res->flags & IORESOURCE_MEM_64))
130 max = PCIBIOS_MAX_MEM_32;
131
132 pci_bus_for_each_resource(bus, r, i) {
133 if (!r)
134 continue;
135
136 /* type_mask must match */
137 if ((res->flags ^ r->flags) & type_mask)
138 continue;
139
140 /* We cannot allocate a non-prefetching resource
141 from a pre-fetching area */
142 if ((r->flags & IORESOURCE_PREFETCH) &&
143 !(res->flags & IORESOURCE_PREFETCH))
144 continue;
145
146 /* Ok, try it out.. */
147 ret = allocate_resource(r, res, size,
148 r->start ? : min,
149 max, align,
150 alignf, alignf_data);
151 if (ret == 0)
152 break;
153 }
154 return ret;
155}
156
157/**
158 * pci_bus_add_device - add a single device
159 * @dev: device to add
160 *
161 * This adds a single pci device to the global
162 * device list and adds sysfs and procfs entries
163 */
164int pci_bus_add_device(struct pci_dev *dev)
165{
166 int retval;
167 retval = device_add(&dev->dev);
168 if (retval)
169 return retval;
170
171 dev->is_added = 1;
172 pci_proc_attach_device(dev);
173 pci_create_sysfs_dev_files(dev);
174 return 0;
175}
176
177/**
178 * pci_bus_add_child - add a child bus
179 * @bus: bus to add
180 *
181 * This adds sysfs entries for a single bus
182 */
183int pci_bus_add_child(struct pci_bus *bus)
184{
185 int retval;
186
187 if (bus->bridge)
188 bus->dev.parent = bus->bridge;
189
190 retval = device_register(&bus->dev);
191 if (retval)
192 return retval;
193
194 bus->is_added = 1;
195
196 /* Create legacy_io and legacy_mem files for this bus */
197 pci_create_legacy_files(bus);
198
199 return retval;
200}
201
202/**
203 * pci_bus_add_devices - insert newly discovered PCI devices
204 * @bus: bus to check for new devices
205 *
206 * Add newly discovered PCI devices (which are on the bus->devices
207 * list) to the global PCI device list, add the sysfs and procfs
208 * entries. Where a bridge is found, add the discovered bus to
209 * the parents list of child buses, and recurse (breadth-first
210 * to be compatible with 2.4)
211 *
212 * Call hotplug for each new devices.
213 */
214void pci_bus_add_devices(const struct pci_bus *bus)
215{
216 struct pci_dev *dev;
217 struct pci_bus *child;
218 int retval;
219
220 list_for_each_entry(dev, &bus->devices, bus_list) {
221 /* Skip already-added devices */
222 if (dev->is_added)
223 continue;
224 retval = pci_bus_add_device(dev);
225 if (retval)
226 dev_err(&dev->dev, "Error adding device, continuing\n");
227 }
228
229 list_for_each_entry(dev, &bus->devices, bus_list) {
230 BUG_ON(!dev->is_added);
231
232 child = dev->subordinate;
233 /*
234 * If there is an unattached subordinate bus, attach
235 * it and then scan for unattached PCI devices.
236 */
237 if (!child)
238 continue;
239 if (list_empty(&child->node)) {
240 down_write(&pci_bus_sem);
241 list_add_tail(&child->node, &dev->bus->children);
242 up_write(&pci_bus_sem);
243 }
244 pci_bus_add_devices(child);
245
246 /*
247 * register the bus with sysfs as the parent is now
248 * properly registered.
249 */
250 if (child->is_added)
251 continue;
252 retval = pci_bus_add_child(child);
253 if (retval)
254 dev_err(&dev->dev, "Error adding bus, continuing\n");
255 }
256}
257
258void pci_enable_bridges(struct pci_bus *bus)
259{
260 struct pci_dev *dev;
261 int retval;
262
263 list_for_each_entry(dev, &bus->devices, bus_list) {
264 if (dev->subordinate) {
265 if (!pci_is_enabled(dev)) {
266 retval = pci_enable_device(dev);
267 if (retval)
268 dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n", retval);
269 pci_set_master(dev);
270 }
271 pci_enable_bridges(dev->subordinate);
272 }
273 }
274}
275
276/** pci_walk_bus - walk devices on/under bus, calling callback.
277 * @top bus whose devices should be walked
278 * @cb callback to be called for each device found
279 * @userdata arbitrary pointer to be passed to callback.
280 *
281 * Walk the given bus, including any bridged devices
282 * on buses under this bus. Call the provided callback
283 * on each device found.
284 *
285 * We check the return of @cb each time. If it returns anything
286 * other than 0, we break out.
287 *
288 */
289void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
290 void *userdata)
291{
292 struct pci_dev *dev;
293 struct pci_bus *bus;
294 struct list_head *next;
295 int retval;
296
297 bus = top;
298 down_read(&pci_bus_sem);
299 next = top->devices.next;
300 for (;;) {
301 if (next == &bus->devices) {
302 /* end of this bus, go up or finish */
303 if (bus == top)
304 break;
305 next = bus->self->bus_list.next;
306 bus = bus->self->bus;
307 continue;
308 }
309 dev = list_entry(next, struct pci_dev, bus_list);
310 if (dev->subordinate) {
311 /* this is a pci-pci bridge, do its devices next */
312 next = dev->subordinate->devices.next;
313 bus = dev->subordinate;
314 } else
315 next = dev->bus_list.next;
316
317 /* Run device routines with the device locked */
318 device_lock(&dev->dev);
319 retval = cb(dev, userdata);
320 device_unlock(&dev->dev);
321 if (retval)
322 break;
323 }
324 up_read(&pci_bus_sem);
325}
326EXPORT_SYMBOL_GPL(pci_walk_bus);
327
328EXPORT_SYMBOL(pci_bus_alloc_resource);
329EXPORT_SYMBOL_GPL(pci_bus_add_device);
330EXPORT_SYMBOL(pci_bus_add_devices);
331EXPORT_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);