Line data Source code
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 :
19 0 : void pci_add_resource_offset(struct list_head *resources, struct resource *res,
20 : resource_size_t offset)
21 : {
22 : struct resource_entry *entry;
23 :
24 0 : entry = resource_list_create_entry(res, 0);
25 0 : if (!entry) {
26 0 : pr_err("PCI: can't add host bridge window %pR\n", res);
27 0 : return;
28 : }
29 :
30 0 : entry->offset = offset;
31 : resource_list_add_tail(entry, resources);
32 : }
33 : EXPORT_SYMBOL(pci_add_resource_offset);
34 :
35 0 : void pci_add_resource(struct list_head *resources, struct resource *res)
36 : {
37 0 : pci_add_resource_offset(resources, res, 0);
38 0 : }
39 : EXPORT_SYMBOL(pci_add_resource);
40 :
41 0 : void pci_free_resource_list(struct list_head *resources)
42 : {
43 0 : resource_list_free(resources);
44 0 : }
45 : EXPORT_SYMBOL(pci_free_resource_list);
46 :
47 0 : void 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 0 : bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
53 0 : if (!bus_res) {
54 0 : dev_err(&bus->dev, "can't add %pR resource\n", res);
55 0 : return;
56 : }
57 :
58 0 : bus_res->res = res;
59 0 : bus_res->flags = flags;
60 0 : list_add_tail(&bus_res->list, &bus->resources);
61 : }
62 :
63 0 : struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
64 : {
65 : struct pci_bus_resource *bus_res;
66 :
67 0 : if (n < PCI_BRIDGE_RESOURCE_NUM)
68 0 : return bus->resource[n];
69 :
70 0 : n -= PCI_BRIDGE_RESOURCE_NUM;
71 0 : list_for_each_entry(bus_res, &bus->resources, list) {
72 0 : if (n-- == 0)
73 0 : return bus_res->res;
74 : }
75 : return NULL;
76 : }
77 : EXPORT_SYMBOL_GPL(pci_bus_resource_n);
78 :
79 0 : void pci_bus_remove_resource(struct pci_bus *bus, struct resource *res)
80 : {
81 : struct pci_bus_resource *bus_res, *tmp;
82 : int i;
83 :
84 0 : for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
85 0 : if (bus->resource[i] == res) {
86 0 : bus->resource[i] = NULL;
87 0 : return;
88 : }
89 : }
90 :
91 0 : list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
92 0 : if (bus_res->res == res) {
93 0 : list_del(&bus_res->list);
94 0 : kfree(bus_res);
95 0 : return;
96 : }
97 : }
98 : }
99 :
100 0 : void pci_bus_remove_resources(struct pci_bus *bus)
101 : {
102 : int i;
103 : struct pci_bus_resource *bus_res, *tmp;
104 :
105 0 : for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
106 0 : bus->resource[i] = NULL;
107 :
108 0 : list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
109 0 : list_del(&bus_res->list);
110 0 : kfree(bus_res);
111 : }
112 0 : }
113 :
114 0 : int devm_request_pci_bus_resources(struct device *dev,
115 : struct list_head *resources)
116 : {
117 : struct resource_entry *win;
118 : struct resource *parent, *res;
119 : int err;
120 :
121 0 : resource_list_for_each_entry(win, resources) {
122 0 : res = win->res;
123 0 : switch (resource_type(res)) {
124 : case IORESOURCE_IO:
125 : parent = &ioport_resource;
126 : break;
127 : case IORESOURCE_MEM:
128 0 : parent = &iomem_resource;
129 0 : break;
130 : default:
131 0 : continue;
132 : }
133 :
134 0 : err = devm_request_resource(dev, parent, res);
135 0 : if (err)
136 : return err;
137 : }
138 :
139 : return 0;
140 : }
141 : EXPORT_SYMBOL_GPL(devm_request_pci_bus_resources);
142 :
143 : static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
144 : #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
145 : static struct pci_bus_region pci_64_bit = {0,
146 : (pci_bus_addr_t) 0xffffffffffffffffULL};
147 : static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL,
148 : (pci_bus_addr_t) 0xffffffffffffffffULL};
149 : #endif
150 :
151 : /*
152 : * @res contains CPU addresses. Clip it so the corresponding bus addresses
153 : * on @bus are entirely within @region. This is used to control the bus
154 : * addresses of resources we allocate, e.g., we may need a resource that
155 : * can be mapped by a 32-bit BAR.
156 : */
157 0 : static void pci_clip_resource_to_region(struct pci_bus *bus,
158 : struct resource *res,
159 : struct pci_bus_region *region)
160 : {
161 : struct pci_bus_region r;
162 :
163 0 : pcibios_resource_to_bus(bus, &r, res);
164 0 : if (r.start < region->start)
165 0 : r.start = region->start;
166 0 : if (r.end > region->end)
167 0 : r.end = region->end;
168 :
169 0 : if (r.end < r.start)
170 0 : res->end = res->start - 1;
171 : else
172 0 : pcibios_bus_to_resource(bus, res, &r);
173 0 : }
174 :
175 0 : static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
176 : resource_size_t size, resource_size_t align,
177 : resource_size_t min, unsigned long type_mask,
178 : resource_size_t (*alignf)(void *,
179 : const struct resource *,
180 : resource_size_t,
181 : resource_size_t),
182 : void *alignf_data,
183 : struct pci_bus_region *region)
184 : {
185 : struct resource *r, avail;
186 : resource_size_t max;
187 : int ret;
188 :
189 0 : type_mask |= IORESOURCE_TYPE_BITS;
190 :
191 0 : pci_bus_for_each_resource(bus, r) {
192 0 : resource_size_t min_used = min;
193 :
194 0 : if (!r)
195 0 : continue;
196 :
197 : /* type_mask must match */
198 0 : if ((res->flags ^ r->flags) & type_mask)
199 0 : continue;
200 :
201 : /* We cannot allocate a non-prefetching resource
202 : from a pre-fetching area */
203 0 : if ((r->flags & IORESOURCE_PREFETCH) &&
204 0 : !(res->flags & IORESOURCE_PREFETCH))
205 0 : continue;
206 :
207 0 : avail = *r;
208 0 : pci_clip_resource_to_region(bus, &avail, region);
209 :
210 : /*
211 : * "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
212 : * protect badly documented motherboard resources, but if
213 : * this is an already-configured bridge window, its start
214 : * overrides "min".
215 : */
216 0 : if (avail.start)
217 0 : min_used = avail.start;
218 :
219 0 : max = avail.end;
220 :
221 : /* Don't bother if available space isn't large enough */
222 0 : if (size > max - min_used + 1)
223 0 : continue;
224 :
225 : /* Ok, try it out.. */
226 0 : ret = allocate_resource(r, res, size, min_used, max,
227 : align, alignf, alignf_data);
228 0 : if (ret == 0)
229 : return 0;
230 : }
231 : return -ENOMEM;
232 : }
233 :
234 : /**
235 : * pci_bus_alloc_resource - allocate a resource from a parent bus
236 : * @bus: PCI bus
237 : * @res: resource to allocate
238 : * @size: size of resource to allocate
239 : * @align: alignment of resource to allocate
240 : * @min: minimum /proc/iomem address to allocate
241 : * @type_mask: IORESOURCE_* type flags
242 : * @alignf: resource alignment function
243 : * @alignf_data: data argument for resource alignment function
244 : *
245 : * Given the PCI bus a device resides on, the size, minimum address,
246 : * alignment and type, try to find an acceptable resource allocation
247 : * for a specific device resource.
248 : */
249 0 : int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
250 : resource_size_t size, resource_size_t align,
251 : resource_size_t min, unsigned long type_mask,
252 : resource_size_t (*alignf)(void *,
253 : const struct resource *,
254 : resource_size_t,
255 : resource_size_t),
256 : void *alignf_data)
257 : {
258 : #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
259 : int rc;
260 :
261 0 : if (res->flags & IORESOURCE_MEM_64) {
262 0 : rc = pci_bus_alloc_from_region(bus, res, size, align, min,
263 : type_mask, alignf, alignf_data,
264 : &pci_high);
265 0 : if (rc == 0)
266 : return 0;
267 :
268 0 : return pci_bus_alloc_from_region(bus, res, size, align, min,
269 : type_mask, alignf, alignf_data,
270 : &pci_64_bit);
271 : }
272 : #endif
273 :
274 0 : return pci_bus_alloc_from_region(bus, res, size, align, min,
275 : type_mask, alignf, alignf_data,
276 : &pci_32_bit);
277 : }
278 : EXPORT_SYMBOL(pci_bus_alloc_resource);
279 :
280 : /*
281 : * The @idx resource of @dev should be a PCI-PCI bridge window. If this
282 : * resource fits inside a window of an upstream bridge, do nothing. If it
283 : * overlaps an upstream window but extends outside it, clip the resource so
284 : * it fits completely inside.
285 : */
286 0 : bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
287 : {
288 0 : struct pci_bus *bus = dev->bus;
289 0 : struct resource *res = &dev->resource[idx];
290 0 : struct resource orig_res = *res;
291 : struct resource *r;
292 :
293 0 : pci_bus_for_each_resource(bus, r) {
294 : resource_size_t start, end;
295 :
296 0 : if (!r)
297 0 : continue;
298 :
299 0 : if (resource_type(res) != resource_type(r))
300 0 : continue;
301 :
302 0 : start = max(r->start, res->start);
303 0 : end = min(r->end, res->end);
304 :
305 0 : if (start > end)
306 0 : continue; /* no overlap */
307 :
308 0 : if (res->start == start && res->end == end)
309 : return false; /* no change */
310 :
311 0 : res->start = start;
312 0 : res->end = end;
313 0 : res->flags &= ~IORESOURCE_UNSET;
314 0 : orig_res.flags &= ~IORESOURCE_UNSET;
315 0 : pci_info(dev, "%pR clipped to %pR\n", &orig_res, res);
316 :
317 0 : return true;
318 : }
319 :
320 : return false;
321 : }
322 :
323 0 : void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
324 :
325 0 : void __weak pcibios_bus_add_device(struct pci_dev *pdev) { }
326 :
327 : /**
328 : * pci_bus_add_device - start driver for a single device
329 : * @dev: device to add
330 : *
331 : * This adds add sysfs entries and start device drivers
332 : */
333 0 : void pci_bus_add_device(struct pci_dev *dev)
334 : {
335 : int retval;
336 :
337 : /*
338 : * Can not put in pci_device_add yet because resources
339 : * are not assigned yet for some devices.
340 : */
341 0 : pcibios_bus_add_device(dev);
342 0 : pci_fixup_device(pci_fixup_final, dev);
343 0 : pci_create_sysfs_dev_files(dev);
344 0 : pci_proc_attach_device(dev);
345 0 : pci_bridge_d3_update(dev);
346 :
347 0 : dev->match_driver = true;
348 0 : retval = device_attach(&dev->dev);
349 0 : if (retval < 0 && retval != -EPROBE_DEFER)
350 0 : pci_warn(dev, "device attach failed (%d)\n", retval);
351 :
352 0 : pci_dev_assign_added(dev, true);
353 0 : }
354 : EXPORT_SYMBOL_GPL(pci_bus_add_device);
355 :
356 : /**
357 : * pci_bus_add_devices - start driver for PCI devices
358 : * @bus: bus to check for new devices
359 : *
360 : * Start driver for PCI devices and add some sysfs entries.
361 : */
362 0 : void pci_bus_add_devices(const struct pci_bus *bus)
363 : {
364 : struct pci_dev *dev;
365 : struct pci_bus *child;
366 :
367 0 : list_for_each_entry(dev, &bus->devices, bus_list) {
368 : /* Skip already-added devices */
369 0 : if (pci_dev_is_added(dev))
370 0 : continue;
371 0 : pci_bus_add_device(dev);
372 : }
373 :
374 0 : list_for_each_entry(dev, &bus->devices, bus_list) {
375 : /* Skip if device attach failed */
376 0 : if (!pci_dev_is_added(dev))
377 0 : continue;
378 0 : child = dev->subordinate;
379 0 : if (child)
380 0 : pci_bus_add_devices(child);
381 : }
382 0 : }
383 : EXPORT_SYMBOL(pci_bus_add_devices);
384 :
385 : /** pci_walk_bus - walk devices on/under bus, calling callback.
386 : * @top bus whose devices should be walked
387 : * @cb callback to be called for each device found
388 : * @userdata arbitrary pointer to be passed to callback.
389 : *
390 : * Walk the given bus, including any bridged devices
391 : * on buses under this bus. Call the provided callback
392 : * on each device found.
393 : *
394 : * We check the return of @cb each time. If it returns anything
395 : * other than 0, we break out.
396 : *
397 : */
398 0 : void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
399 : void *userdata)
400 : {
401 : struct pci_dev *dev;
402 : struct pci_bus *bus;
403 : struct list_head *next;
404 : int retval;
405 :
406 0 : bus = top;
407 0 : down_read(&pci_bus_sem);
408 0 : next = top->devices.next;
409 : for (;;) {
410 0 : if (next == &bus->devices) {
411 : /* end of this bus, go up or finish */
412 0 : if (bus == top)
413 : break;
414 0 : next = bus->self->bus_list.next;
415 0 : bus = bus->self->bus;
416 0 : continue;
417 : }
418 0 : dev = list_entry(next, struct pci_dev, bus_list);
419 0 : if (dev->subordinate) {
420 : /* this is a pci-pci bridge, do its devices next */
421 0 : next = dev->subordinate->devices.next;
422 0 : bus = dev->subordinate;
423 : } else
424 0 : next = dev->bus_list.next;
425 :
426 0 : retval = cb(dev, userdata);
427 0 : if (retval)
428 : break;
429 : }
430 0 : up_read(&pci_bus_sem);
431 0 : }
432 : EXPORT_SYMBOL_GPL(pci_walk_bus);
433 :
434 0 : struct pci_bus *pci_bus_get(struct pci_bus *bus)
435 : {
436 0 : if (bus)
437 0 : get_device(&bus->dev);
438 0 : return bus;
439 : }
440 :
441 0 : void pci_bus_put(struct pci_bus *bus)
442 : {
443 0 : if (bus)
444 0 : put_device(&bus->dev);
445 0 : }
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