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_resources(struct pci_bus *bus)
80 : {
81 : int i;
82 : struct pci_bus_resource *bus_res, *tmp;
83 :
84 0 : for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
85 0 : bus->resource[i] = NULL;
86 :
87 0 : list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
88 0 : list_del(&bus_res->list);
89 0 : kfree(bus_res);
90 : }
91 0 : }
92 :
93 0 : int 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 0 : resource_list_for_each_entry(win, resources) {
101 0 : res = win->res;
102 0 : switch (resource_type(res)) {
103 : case IORESOURCE_IO:
104 : parent = &ioport_resource;
105 : break;
106 : case IORESOURCE_MEM:
107 0 : parent = &iomem_resource;
108 0 : break;
109 : default:
110 0 : continue;
111 : }
112 :
113 0 : err = devm_request_resource(dev, parent, res);
114 0 : if (err)
115 : return err;
116 : }
117 :
118 : return 0;
119 : }
120 : EXPORT_SYMBOL_GPL(devm_request_pci_bus_resources);
121 :
122 : static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
123 : #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
124 : static struct pci_bus_region pci_64_bit = {0,
125 : (pci_bus_addr_t) 0xffffffffffffffffULL};
126 : static 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 : */
136 0 : static 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 0 : pcibios_resource_to_bus(bus, &r, res);
143 0 : if (r.start < region->start)
144 0 : r.start = region->start;
145 0 : if (r.end > region->end)
146 0 : r.end = region->end;
147 :
148 0 : if (r.end < r.start)
149 0 : res->end = res->start - 1;
150 : else
151 0 : pcibios_bus_to_resource(bus, res, &r);
152 0 : }
153 :
154 0 : static 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 0 : type_mask |= IORESOURCE_TYPE_BITS;
169 :
170 0 : pci_bus_for_each_resource(bus, r, i) {
171 0 : resource_size_t min_used = min;
172 :
173 0 : if (!r)
174 0 : continue;
175 :
176 : /* type_mask must match */
177 0 : if ((res->flags ^ r->flags) & type_mask)
178 0 : continue;
179 :
180 : /* We cannot allocate a non-prefetching resource
181 : from a pre-fetching area */
182 0 : if ((r->flags & IORESOURCE_PREFETCH) &&
183 0 : !(res->flags & IORESOURCE_PREFETCH))
184 0 : continue;
185 :
186 0 : avail = *r;
187 0 : 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 0 : if (avail.start)
196 0 : min_used = avail.start;
197 :
198 0 : max = avail.end;
199 :
200 : /* Don't bother if available space isn't large enough */
201 0 : if (size > max - min_used + 1)
202 0 : continue;
203 :
204 : /* Ok, try it out.. */
205 0 : ret = allocate_resource(r, res, size, min_used, max,
206 : align, alignf, alignf_data);
207 0 : if (ret == 0)
208 : return 0;
209 : }
210 : return -ENOMEM;
211 : }
212 :
213 : /**
214 : * pci_bus_alloc_resource - allocate a resource from a parent bus
215 : * @bus: PCI bus
216 : * @res: resource to allocate
217 : * @size: size of resource to allocate
218 : * @align: alignment of resource to allocate
219 : * @min: minimum /proc/iomem address to allocate
220 : * @type_mask: IORESOURCE_* type flags
221 : * @alignf: resource alignment function
222 : * @alignf_data: data argument for resource alignment function
223 : *
224 : * Given the PCI bus a device resides on, the size, minimum address,
225 : * alignment and type, try to find an acceptable resource allocation
226 : * for a specific device resource.
227 : */
228 0 : int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
229 : resource_size_t size, resource_size_t align,
230 : resource_size_t min, unsigned long type_mask,
231 : resource_size_t (*alignf)(void *,
232 : const struct resource *,
233 : resource_size_t,
234 : resource_size_t),
235 : void *alignf_data)
236 : {
237 : #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
238 : int rc;
239 :
240 0 : if (res->flags & IORESOURCE_MEM_64) {
241 0 : rc = pci_bus_alloc_from_region(bus, res, size, align, min,
242 : type_mask, alignf, alignf_data,
243 : &pci_high);
244 0 : if (rc == 0)
245 : return 0;
246 :
247 0 : return pci_bus_alloc_from_region(bus, res, size, align, min,
248 : type_mask, alignf, alignf_data,
249 : &pci_64_bit);
250 : }
251 : #endif
252 :
253 0 : return pci_bus_alloc_from_region(bus, res, size, align, min,
254 : type_mask, alignf, alignf_data,
255 : &pci_32_bit);
256 : }
257 : EXPORT_SYMBOL(pci_bus_alloc_resource);
258 :
259 : /*
260 : * The @idx resource of @dev should be a PCI-PCI bridge window. If this
261 : * resource fits inside a window of an upstream bridge, do nothing. If it
262 : * overlaps an upstream window but extends outside it, clip the resource so
263 : * it fits completely inside.
264 : */
265 0 : bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
266 : {
267 0 : struct pci_bus *bus = dev->bus;
268 0 : struct resource *res = &dev->resource[idx];
269 0 : struct resource orig_res = *res;
270 : struct resource *r;
271 : int i;
272 :
273 0 : pci_bus_for_each_resource(bus, r, i) {
274 : resource_size_t start, end;
275 :
276 0 : if (!r)
277 0 : continue;
278 :
279 0 : if (resource_type(res) != resource_type(r))
280 0 : continue;
281 :
282 0 : start = max(r->start, res->start);
283 0 : end = min(r->end, res->end);
284 :
285 0 : if (start > end)
286 0 : continue; /* no overlap */
287 :
288 0 : if (res->start == start && res->end == end)
289 : return false; /* no change */
290 :
291 0 : res->start = start;
292 0 : res->end = end;
293 0 : res->flags &= ~IORESOURCE_UNSET;
294 0 : orig_res.flags &= ~IORESOURCE_UNSET;
295 0 : pci_info(dev, "%pR clipped to %pR\n", &orig_res, res);
296 :
297 0 : return true;
298 : }
299 :
300 : return false;
301 : }
302 :
303 0 : void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
304 :
305 0 : void __weak pcibios_bus_add_device(struct pci_dev *pdev) { }
306 :
307 : /**
308 : * pci_bus_add_device - start driver for a single device
309 : * @dev: device to add
310 : *
311 : * This adds add sysfs entries and start device drivers
312 : */
313 0 : void pci_bus_add_device(struct pci_dev *dev)
314 : {
315 : int retval;
316 :
317 : /*
318 : * Can not put in pci_device_add yet because resources
319 : * are not assigned yet for some devices.
320 : */
321 0 : pcibios_bus_add_device(dev);
322 0 : pci_fixup_device(pci_fixup_final, dev);
323 0 : pci_create_sysfs_dev_files(dev);
324 0 : pci_proc_attach_device(dev);
325 0 : pci_bridge_d3_update(dev);
326 :
327 0 : dev->match_driver = true;
328 0 : retval = device_attach(&dev->dev);
329 0 : if (retval < 0 && retval != -EPROBE_DEFER)
330 0 : pci_warn(dev, "device attach failed (%d)\n", retval);
331 :
332 0 : pci_dev_assign_added(dev, true);
333 0 : }
334 : EXPORT_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 : */
342 0 : void pci_bus_add_devices(const struct pci_bus *bus)
343 : {
344 : struct pci_dev *dev;
345 : struct pci_bus *child;
346 :
347 0 : list_for_each_entry(dev, &bus->devices, bus_list) {
348 : /* Skip already-added devices */
349 0 : if (pci_dev_is_added(dev))
350 0 : continue;
351 0 : pci_bus_add_device(dev);
352 : }
353 :
354 0 : list_for_each_entry(dev, &bus->devices, bus_list) {
355 : /* Skip if device attach failed */
356 0 : if (!pci_dev_is_added(dev))
357 0 : continue;
358 0 : child = dev->subordinate;
359 0 : if (child)
360 0 : pci_bus_add_devices(child);
361 : }
362 0 : }
363 : EXPORT_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 : */
378 0 : void 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 0 : bus = top;
387 0 : down_read(&pci_bus_sem);
388 0 : next = top->devices.next;
389 : for (;;) {
390 0 : if (next == &bus->devices) {
391 : /* end of this bus, go up or finish */
392 0 : if (bus == top)
393 : break;
394 0 : next = bus->self->bus_list.next;
395 0 : bus = bus->self->bus;
396 0 : continue;
397 : }
398 0 : dev = list_entry(next, struct pci_dev, bus_list);
399 0 : if (dev->subordinate) {
400 : /* this is a pci-pci bridge, do its devices next */
401 0 : next = dev->subordinate->devices.next;
402 0 : bus = dev->subordinate;
403 : } else
404 0 : next = dev->bus_list.next;
405 :
406 0 : retval = cb(dev, userdata);
407 0 : if (retval)
408 : break;
409 : }
410 0 : up_read(&pci_bus_sem);
411 0 : }
412 : EXPORT_SYMBOL_GPL(pci_walk_bus);
413 :
414 0 : struct pci_bus *pci_bus_get(struct pci_bus *bus)
415 : {
416 0 : if (bus)
417 0 : get_device(&bus->dev);
418 0 : return bus;
419 : }
420 :
421 0 : void pci_bus_put(struct pci_bus *bus)
422 : {
423 0 : if (bus)
424 0 : put_device(&bus->dev);
425 0 : }
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