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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * From setup-res.c, by:
4 * Dave Rusling (david.rusling@reo.mts.dec.com)
5 * David Mosberger (davidm@cs.arizona.edu)
6 * David Miller (davem@redhat.com)
7 * Ivan Kokshaysky (ink@jurassic.park.msu.ru)
8 */
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/pci.h>
12#include <linux/errno.h>
13#include <linux/ioport.h>
14#include <linux/proc_fs.h>
15#include <linux/slab.h>
16
17#include "pci.h"
18
19void pci_add_resource_offset(struct list_head *resources, struct resource *res,
20 resource_size_t offset)
21{
22 struct resource_entry *entry;
23
24 entry = resource_list_create_entry(res, 0);
25 if (!entry) {
26 pr_err("PCI: can't add host bridge window %pR\n", res);
27 return;
28 }
29
30 entry->offset = offset;
31 resource_list_add_tail(entry, resources);
32}
33EXPORT_SYMBOL(pci_add_resource_offset);
34
35void pci_add_resource(struct list_head *resources, struct resource *res)
36{
37 pci_add_resource_offset(resources, res, 0);
38}
39EXPORT_SYMBOL(pci_add_resource);
40
41void pci_free_resource_list(struct list_head *resources)
42{
43 resource_list_free(resources);
44}
45EXPORT_SYMBOL(pci_free_resource_list);
46
47void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
48 unsigned int flags)
49{
50 struct pci_bus_resource *bus_res;
51
52 bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
53 if (!bus_res) {
54 dev_err(&bus->dev, "can't add %pR resource\n", res);
55 return;
56 }
57
58 bus_res->res = res;
59 bus_res->flags = flags;
60 list_add_tail(&bus_res->list, &bus->resources);
61}
62
63struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
64{
65 struct pci_bus_resource *bus_res;
66
67 if (n < PCI_BRIDGE_RESOURCE_NUM)
68 return bus->resource[n];
69
70 n -= PCI_BRIDGE_RESOURCE_NUM;
71 list_for_each_entry(bus_res, &bus->resources, list) {
72 if (n-- == 0)
73 return bus_res->res;
74 }
75 return NULL;
76}
77EXPORT_SYMBOL_GPL(pci_bus_resource_n);
78
79void pci_bus_remove_resources(struct pci_bus *bus)
80{
81 int i;
82 struct pci_bus_resource *bus_res, *tmp;
83
84 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
85 bus->resource[i] = NULL;
86
87 list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
88 list_del(&bus_res->list);
89 kfree(bus_res);
90 }
91}
92
93int devm_request_pci_bus_resources(struct device *dev,
94 struct list_head *resources)
95{
96 struct resource_entry *win;
97 struct resource *parent, *res;
98 int err;
99
100 resource_list_for_each_entry(win, resources) {
101 res = win->res;
102 switch (resource_type(res)) {
103 case IORESOURCE_IO:
104 parent = &ioport_resource;
105 break;
106 case IORESOURCE_MEM:
107 parent = &iomem_resource;
108 break;
109 default:
110 continue;
111 }
112
113 err = devm_request_resource(dev, parent, res);
114 if (err)
115 return err;
116 }
117
118 return 0;
119}
120EXPORT_SYMBOL_GPL(devm_request_pci_bus_resources);
121
122static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
123#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
124static struct pci_bus_region pci_64_bit = {0,
125 (pci_bus_addr_t) 0xffffffffffffffffULL};
126static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL,
127 (pci_bus_addr_t) 0xffffffffffffffffULL};
128#endif
129
130/*
131 * @res contains CPU addresses. Clip it so the corresponding bus addresses
132 * on @bus are entirely within @region. This is used to control the bus
133 * addresses of resources we allocate, e.g., we may need a resource that
134 * can be mapped by a 32-bit BAR.
135 */
136static void pci_clip_resource_to_region(struct pci_bus *bus,
137 struct resource *res,
138 struct pci_bus_region *region)
139{
140 struct pci_bus_region r;
141
142 pcibios_resource_to_bus(bus, &r, res);
143 if (r.start < region->start)
144 r.start = region->start;
145 if (r.end > region->end)
146 r.end = region->end;
147
148 if (r.end < r.start)
149 res->end = res->start - 1;
150 else
151 pcibios_bus_to_resource(bus, res, &r);
152}
153
154static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
155 resource_size_t size, resource_size_t align,
156 resource_size_t min, unsigned long type_mask,
157 resource_size_t (*alignf)(void *,
158 const struct resource *,
159 resource_size_t,
160 resource_size_t),
161 void *alignf_data,
162 struct pci_bus_region *region)
163{
164 int i, ret;
165 struct resource *r, avail;
166 resource_size_t max;
167
168 type_mask |= IORESOURCE_TYPE_BITS;
169
170 pci_bus_for_each_resource(bus, r, i) {
171 resource_size_t min_used = min;
172
173 if (!r)
174 continue;
175
176 /* type_mask must match */
177 if ((res->flags ^ r->flags) & type_mask)
178 continue;
179
180 /* We cannot allocate a non-prefetching resource
181 from a pre-fetching area */
182 if ((r->flags & IORESOURCE_PREFETCH) &&
183 !(res->flags & IORESOURCE_PREFETCH))
184 continue;
185
186 avail = *r;
187 pci_clip_resource_to_region(bus, &avail, region);
188
189 /*
190 * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
191 * protect badly documented motherboard resources, but if
192 * this is an already-configured bridge window, its start
193 * overrides "min".
194 */
195 if (avail.start)
196 min_used = avail.start;
197
198 max = avail.end;
199
200 /* Ok, try it out.. */
201 ret = allocate_resource(r, res, size, min_used, max,
202 align, alignf, alignf_data);
203 if (ret == 0)
204 return 0;
205 }
206 return -ENOMEM;
207}
208
209/**
210 * pci_bus_alloc_resource - allocate a resource from a parent bus
211 * @bus: PCI bus
212 * @res: resource to allocate
213 * @size: size of resource to allocate
214 * @align: alignment of resource to allocate
215 * @min: minimum /proc/iomem address to allocate
216 * @type_mask: IORESOURCE_* type flags
217 * @alignf: resource alignment function
218 * @alignf_data: data argument for resource alignment function
219 *
220 * Given the PCI bus a device resides on, the size, minimum address,
221 * alignment and type, try to find an acceptable resource allocation
222 * for a specific device resource.
223 */
224int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
225 resource_size_t size, resource_size_t align,
226 resource_size_t min, unsigned long type_mask,
227 resource_size_t (*alignf)(void *,
228 const struct resource *,
229 resource_size_t,
230 resource_size_t),
231 void *alignf_data)
232{
233#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
234 int rc;
235
236 if (res->flags & IORESOURCE_MEM_64) {
237 rc = pci_bus_alloc_from_region(bus, res, size, align, min,
238 type_mask, alignf, alignf_data,
239 &pci_high);
240 if (rc == 0)
241 return 0;
242
243 return pci_bus_alloc_from_region(bus, res, size, align, min,
244 type_mask, alignf, alignf_data,
245 &pci_64_bit);
246 }
247#endif
248
249 return pci_bus_alloc_from_region(bus, res, size, align, min,
250 type_mask, alignf, alignf_data,
251 &pci_32_bit);
252}
253EXPORT_SYMBOL(pci_bus_alloc_resource);
254
255/*
256 * The @idx resource of @dev should be a PCI-PCI bridge window. If this
257 * resource fits inside a window of an upstream bridge, do nothing. If it
258 * overlaps an upstream window but extends outside it, clip the resource so
259 * it fits completely inside.
260 */
261bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
262{
263 struct pci_bus *bus = dev->bus;
264 struct resource *res = &dev->resource[idx];
265 struct resource orig_res = *res;
266 struct resource *r;
267 int i;
268
269 pci_bus_for_each_resource(bus, r, i) {
270 resource_size_t start, end;
271
272 if (!r)
273 continue;
274
275 if (resource_type(res) != resource_type(r))
276 continue;
277
278 start = max(r->start, res->start);
279 end = min(r->end, res->end);
280
281 if (start > end)
282 continue; /* no overlap */
283
284 if (res->start == start && res->end == end)
285 return false; /* no change */
286
287 res->start = start;
288 res->end = end;
289 res->flags &= ~IORESOURCE_UNSET;
290 orig_res.flags &= ~IORESOURCE_UNSET;
291 pci_info(dev, "%pR clipped to %pR\n", &orig_res, res);
292
293 return true;
294 }
295
296 return false;
297}
298
299void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
300
301void __weak pcibios_bus_add_device(struct pci_dev *pdev) { }
302
303/**
304 * pci_bus_add_device - start driver for a single device
305 * @dev: device to add
306 *
307 * This adds add sysfs entries and start device drivers
308 */
309void pci_bus_add_device(struct pci_dev *dev)
310{
311 int retval;
312
313 /*
314 * Can not put in pci_device_add yet because resources
315 * are not assigned yet for some devices.
316 */
317 pcibios_bus_add_device(dev);
318 pci_fixup_device(pci_fixup_final, dev);
319 pci_create_sysfs_dev_files(dev);
320 pci_proc_attach_device(dev);
321 pci_bridge_d3_update(dev);
322
323 dev->match_driver = true;
324 retval = device_attach(&dev->dev);
325 if (retval < 0 && retval != -EPROBE_DEFER) {
326 pci_warn(dev, "device attach failed (%d)\n", retval);
327 pci_proc_detach_device(dev);
328 pci_remove_sysfs_dev_files(dev);
329 return;
330 }
331
332 pci_dev_assign_added(dev, true);
333}
334EXPORT_SYMBOL_GPL(pci_bus_add_device);
335
336/**
337 * pci_bus_add_devices - start driver for PCI devices
338 * @bus: bus to check for new devices
339 *
340 * Start driver for PCI devices and add some sysfs entries.
341 */
342void pci_bus_add_devices(const struct pci_bus *bus)
343{
344 struct pci_dev *dev;
345 struct pci_bus *child;
346
347 list_for_each_entry(dev, &bus->devices, bus_list) {
348 /* Skip already-added devices */
349 if (pci_dev_is_added(dev))
350 continue;
351 pci_bus_add_device(dev);
352 }
353
354 list_for_each_entry(dev, &bus->devices, bus_list) {
355 /* Skip if device attach failed */
356 if (!pci_dev_is_added(dev))
357 continue;
358 child = dev->subordinate;
359 if (child)
360 pci_bus_add_devices(child);
361 }
362}
363EXPORT_SYMBOL(pci_bus_add_devices);
364
365/** pci_walk_bus - walk devices on/under bus, calling callback.
366 * @top bus whose devices should be walked
367 * @cb callback to be called for each device found
368 * @userdata arbitrary pointer to be passed to callback.
369 *
370 * Walk the given bus, including any bridged devices
371 * on buses under this bus. Call the provided callback
372 * on each device found.
373 *
374 * We check the return of @cb each time. If it returns anything
375 * other than 0, we break out.
376 *
377 */
378void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
379 void *userdata)
380{
381 struct pci_dev *dev;
382 struct pci_bus *bus;
383 struct list_head *next;
384 int retval;
385
386 bus = top;
387 down_read(&pci_bus_sem);
388 next = top->devices.next;
389 for (;;) {
390 if (next == &bus->devices) {
391 /* end of this bus, go up or finish */
392 if (bus == top)
393 break;
394 next = bus->self->bus_list.next;
395 bus = bus->self->bus;
396 continue;
397 }
398 dev = list_entry(next, struct pci_dev, bus_list);
399 if (dev->subordinate) {
400 /* this is a pci-pci bridge, do its devices next */
401 next = dev->subordinate->devices.next;
402 bus = dev->subordinate;
403 } else
404 next = dev->bus_list.next;
405
406 retval = cb(dev, userdata);
407 if (retval)
408 break;
409 }
410 up_read(&pci_bus_sem);
411}
412EXPORT_SYMBOL_GPL(pci_walk_bus);
413
414struct pci_bus *pci_bus_get(struct pci_bus *bus)
415{
416 if (bus)
417 get_device(&bus->dev);
418 return bus;
419}
420
421void pci_bus_put(struct pci_bus *bus)
422{
423 if (bus)
424 put_device(&bus->dev);
425}
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);