Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
4 : * (C) Copyright 2002-2004 IBM Corp.
5 : * (C) Copyright 2003 Matthew Wilcox
6 : * (C) Copyright 2003 Hewlett-Packard
7 : * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
8 : * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
9 : *
10 : * File attributes for PCI devices
11 : *
12 : * Modeled after usb's driverfs.c
13 : */
14 :
15 :
16 : #include <linux/kernel.h>
17 : #include <linux/sched.h>
18 : #include <linux/pci.h>
19 : #include <linux/stat.h>
20 : #include <linux/export.h>
21 : #include <linux/topology.h>
22 : #include <linux/mm.h>
23 : #include <linux/fs.h>
24 : #include <linux/capability.h>
25 : #include <linux/security.h>
26 : #include <linux/slab.h>
27 : #include <linux/vgaarb.h>
28 : #include <linux/pm_runtime.h>
29 : #include <linux/msi.h>
30 : #include <linux/of.h>
31 : #include <linux/aperture.h>
32 : #include "pci.h"
33 :
34 : static int sysfs_initialized; /* = 0 */
35 :
36 : /* show configuration fields */
37 : #define pci_config_attr(field, format_string) \
38 : static ssize_t \
39 : field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
40 : { \
41 : struct pci_dev *pdev; \
42 : \
43 : pdev = to_pci_dev(dev); \
44 : return sysfs_emit(buf, format_string, pdev->field); \
45 : } \
46 : static DEVICE_ATTR_RO(field)
47 :
48 0 : pci_config_attr(vendor, "0x%04x\n");
49 0 : pci_config_attr(device, "0x%04x\n");
50 0 : pci_config_attr(subsystem_vendor, "0x%04x\n");
51 0 : pci_config_attr(subsystem_device, "0x%04x\n");
52 0 : pci_config_attr(revision, "0x%02x\n");
53 0 : pci_config_attr(class, "0x%06x\n");
54 :
55 0 : static ssize_t irq_show(struct device *dev,
56 : struct device_attribute *attr,
57 : char *buf)
58 : {
59 0 : struct pci_dev *pdev = to_pci_dev(dev);
60 :
61 : #ifdef CONFIG_PCI_MSI
62 : /*
63 : * For MSI, show the first MSI IRQ; for all other cases including
64 : * MSI-X, show the legacy INTx IRQ.
65 : */
66 0 : if (pdev->msi_enabled)
67 0 : return sysfs_emit(buf, "%u\n", pci_irq_vector(pdev, 0));
68 : #endif
69 :
70 0 : return sysfs_emit(buf, "%u\n", pdev->irq);
71 : }
72 : static DEVICE_ATTR_RO(irq);
73 :
74 0 : static ssize_t broken_parity_status_show(struct device *dev,
75 : struct device_attribute *attr,
76 : char *buf)
77 : {
78 0 : struct pci_dev *pdev = to_pci_dev(dev);
79 0 : return sysfs_emit(buf, "%u\n", pdev->broken_parity_status);
80 : }
81 :
82 0 : static ssize_t broken_parity_status_store(struct device *dev,
83 : struct device_attribute *attr,
84 : const char *buf, size_t count)
85 : {
86 0 : struct pci_dev *pdev = to_pci_dev(dev);
87 : unsigned long val;
88 :
89 0 : if (kstrtoul(buf, 0, &val) < 0)
90 : return -EINVAL;
91 :
92 0 : pdev->broken_parity_status = !!val;
93 :
94 0 : return count;
95 : }
96 : static DEVICE_ATTR_RW(broken_parity_status);
97 :
98 : static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
99 : struct device_attribute *attr, char *buf)
100 : {
101 : const struct cpumask *mask;
102 :
103 : #ifdef CONFIG_NUMA
104 : if (dev_to_node(dev) == NUMA_NO_NODE)
105 : mask = cpu_online_mask;
106 : else
107 : mask = cpumask_of_node(dev_to_node(dev));
108 : #else
109 0 : mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
110 : #endif
111 0 : return cpumap_print_to_pagebuf(list, buf, mask);
112 : }
113 :
114 0 : static ssize_t local_cpus_show(struct device *dev,
115 : struct device_attribute *attr, char *buf)
116 : {
117 0 : return pci_dev_show_local_cpu(dev, false, attr, buf);
118 : }
119 : static DEVICE_ATTR_RO(local_cpus);
120 :
121 0 : static ssize_t local_cpulist_show(struct device *dev,
122 : struct device_attribute *attr, char *buf)
123 : {
124 0 : return pci_dev_show_local_cpu(dev, true, attr, buf);
125 : }
126 : static DEVICE_ATTR_RO(local_cpulist);
127 :
128 : /*
129 : * PCI Bus Class Devices
130 : */
131 0 : static ssize_t cpuaffinity_show(struct device *dev,
132 : struct device_attribute *attr, char *buf)
133 : {
134 0 : const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
135 :
136 0 : return cpumap_print_to_pagebuf(false, buf, cpumask);
137 : }
138 : static DEVICE_ATTR_RO(cpuaffinity);
139 :
140 0 : static ssize_t cpulistaffinity_show(struct device *dev,
141 : struct device_attribute *attr, char *buf)
142 : {
143 0 : const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
144 :
145 0 : return cpumap_print_to_pagebuf(true, buf, cpumask);
146 : }
147 : static DEVICE_ATTR_RO(cpulistaffinity);
148 :
149 0 : static ssize_t power_state_show(struct device *dev,
150 : struct device_attribute *attr, char *buf)
151 : {
152 0 : struct pci_dev *pdev = to_pci_dev(dev);
153 :
154 0 : return sysfs_emit(buf, "%s\n", pci_power_name(pdev->current_state));
155 : }
156 : static DEVICE_ATTR_RO(power_state);
157 :
158 : /* show resources */
159 0 : static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
160 : char *buf)
161 : {
162 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
163 : int i;
164 : int max;
165 : resource_size_t start, end;
166 0 : size_t len = 0;
167 :
168 0 : if (pci_dev->subordinate)
169 : max = DEVICE_COUNT_RESOURCE;
170 : else
171 0 : max = PCI_BRIDGE_RESOURCES;
172 :
173 0 : for (i = 0; i < max; i++) {
174 0 : struct resource *res = &pci_dev->resource[i];
175 0 : pci_resource_to_user(pci_dev, i, res, &start, &end);
176 0 : len += sysfs_emit_at(buf, len, "0x%016llx 0x%016llx 0x%016llx\n",
177 : (unsigned long long)start,
178 : (unsigned long long)end,
179 0 : (unsigned long long)res->flags);
180 : }
181 0 : return len;
182 : }
183 : static DEVICE_ATTR_RO(resource);
184 :
185 0 : static ssize_t max_link_speed_show(struct device *dev,
186 : struct device_attribute *attr, char *buf)
187 : {
188 0 : struct pci_dev *pdev = to_pci_dev(dev);
189 :
190 0 : return sysfs_emit(buf, "%s\n",
191 : pci_speed_string(pcie_get_speed_cap(pdev)));
192 : }
193 : static DEVICE_ATTR_RO(max_link_speed);
194 :
195 0 : static ssize_t max_link_width_show(struct device *dev,
196 : struct device_attribute *attr, char *buf)
197 : {
198 0 : struct pci_dev *pdev = to_pci_dev(dev);
199 :
200 0 : return sysfs_emit(buf, "%u\n", pcie_get_width_cap(pdev));
201 : }
202 : static DEVICE_ATTR_RO(max_link_width);
203 :
204 0 : static ssize_t current_link_speed_show(struct device *dev,
205 : struct device_attribute *attr, char *buf)
206 : {
207 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
208 : u16 linkstat;
209 : int err;
210 : enum pci_bus_speed speed;
211 :
212 0 : err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
213 0 : if (err)
214 : return -EINVAL;
215 :
216 0 : speed = pcie_link_speed[linkstat & PCI_EXP_LNKSTA_CLS];
217 :
218 0 : return sysfs_emit(buf, "%s\n", pci_speed_string(speed));
219 : }
220 : static DEVICE_ATTR_RO(current_link_speed);
221 :
222 0 : static ssize_t current_link_width_show(struct device *dev,
223 : struct device_attribute *attr, char *buf)
224 : {
225 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
226 : u16 linkstat;
227 : int err;
228 :
229 0 : err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
230 0 : if (err)
231 : return -EINVAL;
232 :
233 0 : return sysfs_emit(buf, "%u\n",
234 0 : (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
235 : }
236 : static DEVICE_ATTR_RO(current_link_width);
237 :
238 0 : static ssize_t secondary_bus_number_show(struct device *dev,
239 : struct device_attribute *attr,
240 : char *buf)
241 : {
242 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
243 : u8 sec_bus;
244 : int err;
245 :
246 0 : err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
247 0 : if (err)
248 : return -EINVAL;
249 :
250 0 : return sysfs_emit(buf, "%u\n", sec_bus);
251 : }
252 : static DEVICE_ATTR_RO(secondary_bus_number);
253 :
254 0 : static ssize_t subordinate_bus_number_show(struct device *dev,
255 : struct device_attribute *attr,
256 : char *buf)
257 : {
258 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
259 : u8 sub_bus;
260 : int err;
261 :
262 0 : err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
263 0 : if (err)
264 : return -EINVAL;
265 :
266 0 : return sysfs_emit(buf, "%u\n", sub_bus);
267 : }
268 : static DEVICE_ATTR_RO(subordinate_bus_number);
269 :
270 0 : static ssize_t ari_enabled_show(struct device *dev,
271 : struct device_attribute *attr,
272 : char *buf)
273 : {
274 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
275 :
276 0 : return sysfs_emit(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
277 : }
278 : static DEVICE_ATTR_RO(ari_enabled);
279 :
280 0 : static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
281 : char *buf)
282 : {
283 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
284 :
285 0 : return sysfs_emit(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
286 0 : pci_dev->vendor, pci_dev->device,
287 0 : pci_dev->subsystem_vendor, pci_dev->subsystem_device,
288 0 : (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
289 0 : (u8)(pci_dev->class));
290 : }
291 : static DEVICE_ATTR_RO(modalias);
292 :
293 0 : static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
294 : const char *buf, size_t count)
295 : {
296 0 : struct pci_dev *pdev = to_pci_dev(dev);
297 : unsigned long val;
298 0 : ssize_t result = 0;
299 :
300 : /* this can crash the machine when done on the "wrong" device */
301 0 : if (!capable(CAP_SYS_ADMIN))
302 : return -EPERM;
303 :
304 0 : if (kstrtoul(buf, 0, &val) < 0)
305 : return -EINVAL;
306 :
307 0 : device_lock(dev);
308 0 : if (dev->driver)
309 : result = -EBUSY;
310 0 : else if (val)
311 0 : result = pci_enable_device(pdev);
312 0 : else if (pci_is_enabled(pdev))
313 0 : pci_disable_device(pdev);
314 : else
315 : result = -EIO;
316 0 : device_unlock(dev);
317 :
318 0 : return result < 0 ? result : count;
319 : }
320 :
321 0 : static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
322 : char *buf)
323 : {
324 : struct pci_dev *pdev;
325 :
326 0 : pdev = to_pci_dev(dev);
327 0 : return sysfs_emit(buf, "%u\n", atomic_read(&pdev->enable_cnt));
328 : }
329 : static DEVICE_ATTR_RW(enable);
330 :
331 : #ifdef CONFIG_NUMA
332 : static ssize_t numa_node_store(struct device *dev,
333 : struct device_attribute *attr, const char *buf,
334 : size_t count)
335 : {
336 : struct pci_dev *pdev = to_pci_dev(dev);
337 : int node;
338 :
339 : if (!capable(CAP_SYS_ADMIN))
340 : return -EPERM;
341 :
342 : if (kstrtoint(buf, 0, &node) < 0)
343 : return -EINVAL;
344 :
345 : if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
346 : return -EINVAL;
347 :
348 : if (node != NUMA_NO_NODE && !node_online(node))
349 : return -EINVAL;
350 :
351 : add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
352 : pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
353 : node);
354 :
355 : dev->numa_node = node;
356 : return count;
357 : }
358 :
359 : static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
360 : char *buf)
361 : {
362 : return sysfs_emit(buf, "%d\n", dev->numa_node);
363 : }
364 : static DEVICE_ATTR_RW(numa_node);
365 : #endif
366 :
367 0 : static ssize_t dma_mask_bits_show(struct device *dev,
368 : struct device_attribute *attr, char *buf)
369 : {
370 0 : struct pci_dev *pdev = to_pci_dev(dev);
371 :
372 0 : return sysfs_emit(buf, "%d\n", fls64(pdev->dma_mask));
373 : }
374 : static DEVICE_ATTR_RO(dma_mask_bits);
375 :
376 0 : static ssize_t consistent_dma_mask_bits_show(struct device *dev,
377 : struct device_attribute *attr,
378 : char *buf)
379 : {
380 0 : return sysfs_emit(buf, "%d\n", fls64(dev->coherent_dma_mask));
381 : }
382 : static DEVICE_ATTR_RO(consistent_dma_mask_bits);
383 :
384 0 : static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
385 : char *buf)
386 : {
387 0 : struct pci_dev *pdev = to_pci_dev(dev);
388 0 : struct pci_bus *subordinate = pdev->subordinate;
389 :
390 0 : return sysfs_emit(buf, "%u\n", subordinate ?
391 0 : !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
392 0 : : !pdev->no_msi);
393 : }
394 :
395 0 : static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
396 : const char *buf, size_t count)
397 : {
398 0 : struct pci_dev *pdev = to_pci_dev(dev);
399 0 : struct pci_bus *subordinate = pdev->subordinate;
400 : unsigned long val;
401 :
402 0 : if (!capable(CAP_SYS_ADMIN))
403 : return -EPERM;
404 :
405 0 : if (kstrtoul(buf, 0, &val) < 0)
406 : return -EINVAL;
407 :
408 : /*
409 : * "no_msi" and "bus_flags" only affect what happens when a driver
410 : * requests MSI or MSI-X. They don't affect any drivers that have
411 : * already requested MSI or MSI-X.
412 : */
413 0 : if (!subordinate) {
414 0 : pdev->no_msi = !val;
415 0 : pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
416 : val ? "allowed" : "disallowed");
417 0 : return count;
418 : }
419 :
420 0 : if (val)
421 0 : subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
422 : else
423 0 : subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
424 :
425 0 : dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
426 : val ? "allowed" : "disallowed");
427 0 : return count;
428 : }
429 : static DEVICE_ATTR_RW(msi_bus);
430 :
431 0 : static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count)
432 : {
433 : unsigned long val;
434 0 : struct pci_bus *b = NULL;
435 :
436 0 : if (kstrtoul(buf, 0, &val) < 0)
437 : return -EINVAL;
438 :
439 0 : if (val) {
440 0 : pci_lock_rescan_remove();
441 0 : while ((b = pci_find_next_bus(b)) != NULL)
442 0 : pci_rescan_bus(b);
443 0 : pci_unlock_rescan_remove();
444 : }
445 0 : return count;
446 : }
447 : static BUS_ATTR_WO(rescan);
448 :
449 : static struct attribute *pci_bus_attrs[] = {
450 : &bus_attr_rescan.attr,
451 : NULL,
452 : };
453 :
454 : static const struct attribute_group pci_bus_group = {
455 : .attrs = pci_bus_attrs,
456 : };
457 :
458 : const struct attribute_group *pci_bus_groups[] = {
459 : &pci_bus_group,
460 : NULL,
461 : };
462 :
463 0 : static ssize_t dev_rescan_store(struct device *dev,
464 : struct device_attribute *attr, const char *buf,
465 : size_t count)
466 : {
467 : unsigned long val;
468 0 : struct pci_dev *pdev = to_pci_dev(dev);
469 :
470 0 : if (kstrtoul(buf, 0, &val) < 0)
471 : return -EINVAL;
472 :
473 0 : if (val) {
474 0 : pci_lock_rescan_remove();
475 0 : pci_rescan_bus(pdev->bus);
476 0 : pci_unlock_rescan_remove();
477 : }
478 0 : return count;
479 : }
480 : static struct device_attribute dev_attr_dev_rescan = __ATTR(rescan, 0200, NULL,
481 : dev_rescan_store);
482 :
483 0 : static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
484 : const char *buf, size_t count)
485 : {
486 : unsigned long val;
487 :
488 0 : if (kstrtoul(buf, 0, &val) < 0)
489 : return -EINVAL;
490 :
491 0 : if (val && device_remove_file_self(dev, attr))
492 0 : pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
493 0 : return count;
494 : }
495 : static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0220, NULL,
496 : remove_store);
497 :
498 0 : static ssize_t bus_rescan_store(struct device *dev,
499 : struct device_attribute *attr,
500 : const char *buf, size_t count)
501 : {
502 : unsigned long val;
503 0 : struct pci_bus *bus = to_pci_bus(dev);
504 :
505 0 : if (kstrtoul(buf, 0, &val) < 0)
506 : return -EINVAL;
507 :
508 0 : if (val) {
509 0 : pci_lock_rescan_remove();
510 0 : if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
511 0 : pci_rescan_bus_bridge_resize(bus->self);
512 : else
513 0 : pci_rescan_bus(bus);
514 0 : pci_unlock_rescan_remove();
515 : }
516 0 : return count;
517 : }
518 : static struct device_attribute dev_attr_bus_rescan = __ATTR(rescan, 0200, NULL,
519 : bus_rescan_store);
520 :
521 : #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
522 : static ssize_t d3cold_allowed_store(struct device *dev,
523 : struct device_attribute *attr,
524 : const char *buf, size_t count)
525 : {
526 : struct pci_dev *pdev = to_pci_dev(dev);
527 : unsigned long val;
528 :
529 : if (kstrtoul(buf, 0, &val) < 0)
530 : return -EINVAL;
531 :
532 : pdev->d3cold_allowed = !!val;
533 : if (pdev->d3cold_allowed)
534 : pci_d3cold_enable(pdev);
535 : else
536 : pci_d3cold_disable(pdev);
537 :
538 : pm_runtime_resume(dev);
539 :
540 : return count;
541 : }
542 :
543 : static ssize_t d3cold_allowed_show(struct device *dev,
544 : struct device_attribute *attr, char *buf)
545 : {
546 : struct pci_dev *pdev = to_pci_dev(dev);
547 : return sysfs_emit(buf, "%u\n", pdev->d3cold_allowed);
548 : }
549 : static DEVICE_ATTR_RW(d3cold_allowed);
550 : #endif
551 :
552 : #ifdef CONFIG_OF
553 : static ssize_t devspec_show(struct device *dev,
554 : struct device_attribute *attr, char *buf)
555 : {
556 : struct pci_dev *pdev = to_pci_dev(dev);
557 : struct device_node *np = pci_device_to_OF_node(pdev);
558 :
559 : if (np == NULL)
560 : return 0;
561 : return sysfs_emit(buf, "%pOF\n", np);
562 : }
563 : static DEVICE_ATTR_RO(devspec);
564 : #endif
565 :
566 0 : static ssize_t driver_override_store(struct device *dev,
567 : struct device_attribute *attr,
568 : const char *buf, size_t count)
569 : {
570 0 : struct pci_dev *pdev = to_pci_dev(dev);
571 : int ret;
572 :
573 0 : ret = driver_set_override(dev, &pdev->driver_override, buf, count);
574 0 : if (ret)
575 0 : return ret;
576 :
577 0 : return count;
578 : }
579 :
580 0 : static ssize_t driver_override_show(struct device *dev,
581 : struct device_attribute *attr, char *buf)
582 : {
583 0 : struct pci_dev *pdev = to_pci_dev(dev);
584 : ssize_t len;
585 :
586 0 : device_lock(dev);
587 0 : len = sysfs_emit(buf, "%s\n", pdev->driver_override);
588 0 : device_unlock(dev);
589 0 : return len;
590 : }
591 : static DEVICE_ATTR_RW(driver_override);
592 :
593 : static struct attribute *pci_dev_attrs[] = {
594 : &dev_attr_power_state.attr,
595 : &dev_attr_resource.attr,
596 : &dev_attr_vendor.attr,
597 : &dev_attr_device.attr,
598 : &dev_attr_subsystem_vendor.attr,
599 : &dev_attr_subsystem_device.attr,
600 : &dev_attr_revision.attr,
601 : &dev_attr_class.attr,
602 : &dev_attr_irq.attr,
603 : &dev_attr_local_cpus.attr,
604 : &dev_attr_local_cpulist.attr,
605 : &dev_attr_modalias.attr,
606 : #ifdef CONFIG_NUMA
607 : &dev_attr_numa_node.attr,
608 : #endif
609 : &dev_attr_dma_mask_bits.attr,
610 : &dev_attr_consistent_dma_mask_bits.attr,
611 : &dev_attr_enable.attr,
612 : &dev_attr_broken_parity_status.attr,
613 : &dev_attr_msi_bus.attr,
614 : #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
615 : &dev_attr_d3cold_allowed.attr,
616 : #endif
617 : #ifdef CONFIG_OF
618 : &dev_attr_devspec.attr,
619 : #endif
620 : &dev_attr_driver_override.attr,
621 : &dev_attr_ari_enabled.attr,
622 : NULL,
623 : };
624 :
625 : static struct attribute *pci_bridge_attrs[] = {
626 : &dev_attr_subordinate_bus_number.attr,
627 : &dev_attr_secondary_bus_number.attr,
628 : NULL,
629 : };
630 :
631 : static struct attribute *pcie_dev_attrs[] = {
632 : &dev_attr_current_link_speed.attr,
633 : &dev_attr_current_link_width.attr,
634 : &dev_attr_max_link_width.attr,
635 : &dev_attr_max_link_speed.attr,
636 : NULL,
637 : };
638 :
639 : static struct attribute *pcibus_attrs[] = {
640 : &dev_attr_bus_rescan.attr,
641 : &dev_attr_cpuaffinity.attr,
642 : &dev_attr_cpulistaffinity.attr,
643 : NULL,
644 : };
645 :
646 : static const struct attribute_group pcibus_group = {
647 : .attrs = pcibus_attrs,
648 : };
649 :
650 : const struct attribute_group *pcibus_groups[] = {
651 : &pcibus_group,
652 : NULL,
653 : };
654 :
655 0 : static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
656 : char *buf)
657 : {
658 0 : struct pci_dev *pdev = to_pci_dev(dev);
659 0 : struct pci_dev *vga_dev = vga_default_device();
660 :
661 0 : if (vga_dev)
662 0 : return sysfs_emit(buf, "%u\n", (pdev == vga_dev));
663 :
664 0 : return sysfs_emit(buf, "%u\n",
665 0 : !!(pdev->resource[PCI_ROM_RESOURCE].flags &
666 : IORESOURCE_ROM_SHADOW));
667 : }
668 : static DEVICE_ATTR_RO(boot_vga);
669 :
670 0 : static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
671 : struct bin_attribute *bin_attr, char *buf,
672 : loff_t off, size_t count)
673 : {
674 0 : struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
675 0 : unsigned int size = 64;
676 0 : loff_t init_off = off;
677 0 : u8 *data = (u8 *) buf;
678 :
679 : /* Several chips lock up trying to read undefined config space */
680 0 : if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
681 0 : size = dev->cfg_size;
682 0 : else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
683 0 : size = 128;
684 :
685 0 : if (off > size)
686 : return 0;
687 0 : if (off + count > size) {
688 0 : size -= off;
689 0 : count = size;
690 : } else {
691 0 : size = count;
692 : }
693 :
694 0 : pci_config_pm_runtime_get(dev);
695 :
696 0 : if ((off & 1) && size) {
697 : u8 val;
698 0 : pci_user_read_config_byte(dev, off, &val);
699 0 : data[off - init_off] = val;
700 0 : off++;
701 0 : size--;
702 : }
703 :
704 0 : if ((off & 3) && size > 2) {
705 : u16 val;
706 0 : pci_user_read_config_word(dev, off, &val);
707 0 : data[off - init_off] = val & 0xff;
708 0 : data[off - init_off + 1] = (val >> 8) & 0xff;
709 0 : off += 2;
710 0 : size -= 2;
711 : }
712 :
713 0 : while (size > 3) {
714 : u32 val;
715 0 : pci_user_read_config_dword(dev, off, &val);
716 0 : data[off - init_off] = val & 0xff;
717 0 : data[off - init_off + 1] = (val >> 8) & 0xff;
718 0 : data[off - init_off + 2] = (val >> 16) & 0xff;
719 0 : data[off - init_off + 3] = (val >> 24) & 0xff;
720 0 : off += 4;
721 0 : size -= 4;
722 0 : cond_resched();
723 : }
724 :
725 0 : if (size >= 2) {
726 : u16 val;
727 0 : pci_user_read_config_word(dev, off, &val);
728 0 : data[off - init_off] = val & 0xff;
729 0 : data[off - init_off + 1] = (val >> 8) & 0xff;
730 0 : off += 2;
731 0 : size -= 2;
732 : }
733 :
734 0 : if (size > 0) {
735 : u8 val;
736 0 : pci_user_read_config_byte(dev, off, &val);
737 0 : data[off - init_off] = val;
738 : }
739 :
740 0 : pci_config_pm_runtime_put(dev);
741 :
742 0 : return count;
743 : }
744 :
745 0 : static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
746 : struct bin_attribute *bin_attr, char *buf,
747 : loff_t off, size_t count)
748 : {
749 0 : struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
750 0 : unsigned int size = count;
751 0 : loff_t init_off = off;
752 0 : u8 *data = (u8 *) buf;
753 : int ret;
754 :
755 0 : ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
756 : if (ret)
757 : return ret;
758 :
759 0 : if (resource_is_exclusive(&dev->driver_exclusive_resource, off,
760 : count)) {
761 0 : pci_warn_once(dev, "%s: Unexpected write to kernel-exclusive config offset %llx",
762 : current->comm, off);
763 0 : add_taint(TAINT_USER, LOCKDEP_STILL_OK);
764 : }
765 :
766 0 : if (off > dev->cfg_size)
767 : return 0;
768 0 : if (off + count > dev->cfg_size) {
769 0 : size = dev->cfg_size - off;
770 0 : count = size;
771 : }
772 :
773 0 : pci_config_pm_runtime_get(dev);
774 :
775 0 : if ((off & 1) && size) {
776 0 : pci_user_write_config_byte(dev, off, data[off - init_off]);
777 0 : off++;
778 0 : size--;
779 : }
780 :
781 0 : if ((off & 3) && size > 2) {
782 0 : u16 val = data[off - init_off];
783 0 : val |= (u16) data[off - init_off + 1] << 8;
784 0 : pci_user_write_config_word(dev, off, val);
785 0 : off += 2;
786 0 : size -= 2;
787 : }
788 :
789 0 : while (size > 3) {
790 0 : u32 val = data[off - init_off];
791 0 : val |= (u32) data[off - init_off + 1] << 8;
792 0 : val |= (u32) data[off - init_off + 2] << 16;
793 0 : val |= (u32) data[off - init_off + 3] << 24;
794 0 : pci_user_write_config_dword(dev, off, val);
795 0 : off += 4;
796 0 : size -= 4;
797 : }
798 :
799 0 : if (size >= 2) {
800 0 : u16 val = data[off - init_off];
801 0 : val |= (u16) data[off - init_off + 1] << 8;
802 0 : pci_user_write_config_word(dev, off, val);
803 0 : off += 2;
804 0 : size -= 2;
805 : }
806 :
807 0 : if (size)
808 0 : pci_user_write_config_byte(dev, off, data[off - init_off]);
809 :
810 0 : pci_config_pm_runtime_put(dev);
811 :
812 0 : return count;
813 : }
814 : static BIN_ATTR(config, 0644, pci_read_config, pci_write_config, 0);
815 :
816 : static struct bin_attribute *pci_dev_config_attrs[] = {
817 : &bin_attr_config,
818 : NULL,
819 : };
820 :
821 0 : static umode_t pci_dev_config_attr_is_visible(struct kobject *kobj,
822 : struct bin_attribute *a, int n)
823 : {
824 0 : struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
825 :
826 0 : a->size = PCI_CFG_SPACE_SIZE;
827 0 : if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
828 0 : a->size = PCI_CFG_SPACE_EXP_SIZE;
829 :
830 0 : return a->attr.mode;
831 : }
832 :
833 : static const struct attribute_group pci_dev_config_attr_group = {
834 : .bin_attrs = pci_dev_config_attrs,
835 : .is_bin_visible = pci_dev_config_attr_is_visible,
836 : };
837 :
838 : #ifdef HAVE_PCI_LEGACY
839 : /**
840 : * pci_read_legacy_io - read byte(s) from legacy I/O port space
841 : * @filp: open sysfs file
842 : * @kobj: kobject corresponding to file to read from
843 : * @bin_attr: struct bin_attribute for this file
844 : * @buf: buffer to store results
845 : * @off: offset into legacy I/O port space
846 : * @count: number of bytes to read
847 : *
848 : * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
849 : * callback routine (pci_legacy_read).
850 : */
851 : static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
852 : struct bin_attribute *bin_attr, char *buf,
853 : loff_t off, size_t count)
854 : {
855 : struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
856 :
857 : /* Only support 1, 2 or 4 byte accesses */
858 : if (count != 1 && count != 2 && count != 4)
859 : return -EINVAL;
860 :
861 : return pci_legacy_read(bus, off, (u32 *)buf, count);
862 : }
863 :
864 : /**
865 : * pci_write_legacy_io - write byte(s) to legacy I/O port space
866 : * @filp: open sysfs file
867 : * @kobj: kobject corresponding to file to read from
868 : * @bin_attr: struct bin_attribute for this file
869 : * @buf: buffer containing value to be written
870 : * @off: offset into legacy I/O port space
871 : * @count: number of bytes to write
872 : *
873 : * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
874 : * callback routine (pci_legacy_write).
875 : */
876 : static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
877 : struct bin_attribute *bin_attr, char *buf,
878 : loff_t off, size_t count)
879 : {
880 : struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
881 :
882 : /* Only support 1, 2 or 4 byte accesses */
883 : if (count != 1 && count != 2 && count != 4)
884 : return -EINVAL;
885 :
886 : return pci_legacy_write(bus, off, *(u32 *)buf, count);
887 : }
888 :
889 : /**
890 : * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
891 : * @filp: open sysfs file
892 : * @kobj: kobject corresponding to device to be mapped
893 : * @attr: struct bin_attribute for this file
894 : * @vma: struct vm_area_struct passed to mmap
895 : *
896 : * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
897 : * legacy memory space (first meg of bus space) into application virtual
898 : * memory space.
899 : */
900 : static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
901 : struct bin_attribute *attr,
902 : struct vm_area_struct *vma)
903 : {
904 : struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
905 :
906 : return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
907 : }
908 :
909 : /**
910 : * pci_mmap_legacy_io - map legacy PCI IO into user memory space
911 : * @filp: open sysfs file
912 : * @kobj: kobject corresponding to device to be mapped
913 : * @attr: struct bin_attribute for this file
914 : * @vma: struct vm_area_struct passed to mmap
915 : *
916 : * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
917 : * legacy IO space (first meg of bus space) into application virtual
918 : * memory space. Returns -ENOSYS if the operation isn't supported
919 : */
920 : static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
921 : struct bin_attribute *attr,
922 : struct vm_area_struct *vma)
923 : {
924 : struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
925 :
926 : return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
927 : }
928 :
929 : /**
930 : * pci_adjust_legacy_attr - adjustment of legacy file attributes
931 : * @b: bus to create files under
932 : * @mmap_type: I/O port or memory
933 : *
934 : * Stub implementation. Can be overridden by arch if necessary.
935 : */
936 : void __weak pci_adjust_legacy_attr(struct pci_bus *b,
937 : enum pci_mmap_state mmap_type)
938 : {
939 : }
940 :
941 : /**
942 : * pci_create_legacy_files - create legacy I/O port and memory files
943 : * @b: bus to create files under
944 : *
945 : * Some platforms allow access to legacy I/O port and ISA memory space on
946 : * a per-bus basis. This routine creates the files and ties them into
947 : * their associated read, write and mmap files from pci-sysfs.c
948 : *
949 : * On error unwind, but don't propagate the error to the caller
950 : * as it is ok to set up the PCI bus without these files.
951 : */
952 : void pci_create_legacy_files(struct pci_bus *b)
953 : {
954 : int error;
955 :
956 : if (!sysfs_initialized)
957 : return;
958 :
959 : b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
960 : GFP_ATOMIC);
961 : if (!b->legacy_io)
962 : goto kzalloc_err;
963 :
964 : sysfs_bin_attr_init(b->legacy_io);
965 : b->legacy_io->attr.name = "legacy_io";
966 : b->legacy_io->size = 0xffff;
967 : b->legacy_io->attr.mode = 0600;
968 : b->legacy_io->read = pci_read_legacy_io;
969 : b->legacy_io->write = pci_write_legacy_io;
970 : b->legacy_io->mmap = pci_mmap_legacy_io;
971 : b->legacy_io->f_mapping = iomem_get_mapping;
972 : pci_adjust_legacy_attr(b, pci_mmap_io);
973 : error = device_create_bin_file(&b->dev, b->legacy_io);
974 : if (error)
975 : goto legacy_io_err;
976 :
977 : /* Allocated above after the legacy_io struct */
978 : b->legacy_mem = b->legacy_io + 1;
979 : sysfs_bin_attr_init(b->legacy_mem);
980 : b->legacy_mem->attr.name = "legacy_mem";
981 : b->legacy_mem->size = 1024*1024;
982 : b->legacy_mem->attr.mode = 0600;
983 : b->legacy_mem->mmap = pci_mmap_legacy_mem;
984 : b->legacy_mem->f_mapping = iomem_get_mapping;
985 : pci_adjust_legacy_attr(b, pci_mmap_mem);
986 : error = device_create_bin_file(&b->dev, b->legacy_mem);
987 : if (error)
988 : goto legacy_mem_err;
989 :
990 : return;
991 :
992 : legacy_mem_err:
993 : device_remove_bin_file(&b->dev, b->legacy_io);
994 : legacy_io_err:
995 : kfree(b->legacy_io);
996 : b->legacy_io = NULL;
997 : kzalloc_err:
998 : dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n");
999 : }
1000 :
1001 : void pci_remove_legacy_files(struct pci_bus *b)
1002 : {
1003 : if (b->legacy_io) {
1004 : device_remove_bin_file(&b->dev, b->legacy_io);
1005 : device_remove_bin_file(&b->dev, b->legacy_mem);
1006 : kfree(b->legacy_io); /* both are allocated here */
1007 : }
1008 : }
1009 : #endif /* HAVE_PCI_LEGACY */
1010 :
1011 : #if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
1012 :
1013 0 : int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
1014 : enum pci_mmap_api mmap_api)
1015 : {
1016 : unsigned long nr, start, size;
1017 0 : resource_size_t pci_start = 0, pci_end;
1018 :
1019 0 : if (pci_resource_len(pdev, resno) == 0)
1020 : return 0;
1021 0 : nr = vma_pages(vma);
1022 0 : start = vma->vm_pgoff;
1023 0 : size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
1024 0 : if (mmap_api == PCI_MMAP_PROCFS) {
1025 0 : pci_resource_to_user(pdev, resno, &pdev->resource[resno],
1026 : &pci_start, &pci_end);
1027 0 : pci_start >>= PAGE_SHIFT;
1028 : }
1029 0 : if (start >= pci_start && start < pci_start + size &&
1030 0 : start + nr <= pci_start + size)
1031 : return 1;
1032 0 : return 0;
1033 : }
1034 :
1035 : /**
1036 : * pci_mmap_resource - map a PCI resource into user memory space
1037 : * @kobj: kobject for mapping
1038 : * @attr: struct bin_attribute for the file being mapped
1039 : * @vma: struct vm_area_struct passed into the mmap
1040 : * @write_combine: 1 for write_combine mapping
1041 : *
1042 : * Use the regular PCI mapping routines to map a PCI resource into userspace.
1043 : */
1044 0 : static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1045 : struct vm_area_struct *vma, int write_combine)
1046 : {
1047 0 : struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1048 0 : int bar = (unsigned long)attr->private;
1049 : enum pci_mmap_state mmap_type;
1050 0 : struct resource *res = &pdev->resource[bar];
1051 : int ret;
1052 :
1053 0 : ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1054 : if (ret)
1055 : return ret;
1056 :
1057 0 : if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1058 : return -EINVAL;
1059 :
1060 0 : if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1061 : return -EINVAL;
1062 :
1063 0 : mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1064 :
1065 0 : return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1066 : }
1067 :
1068 0 : static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1069 : struct bin_attribute *attr,
1070 : struct vm_area_struct *vma)
1071 : {
1072 0 : return pci_mmap_resource(kobj, attr, vma, 0);
1073 : }
1074 :
1075 0 : static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1076 : struct bin_attribute *attr,
1077 : struct vm_area_struct *vma)
1078 : {
1079 0 : return pci_mmap_resource(kobj, attr, vma, 1);
1080 : }
1081 :
1082 0 : static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1083 : struct bin_attribute *attr, char *buf,
1084 : loff_t off, size_t count, bool write)
1085 : {
1086 0 : struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1087 0 : int bar = (unsigned long)attr->private;
1088 0 : unsigned long port = off;
1089 :
1090 0 : port += pci_resource_start(pdev, bar);
1091 :
1092 0 : if (port > pci_resource_end(pdev, bar))
1093 : return 0;
1094 :
1095 0 : if (port + count - 1 > pci_resource_end(pdev, bar))
1096 : return -EINVAL;
1097 :
1098 0 : switch (count) {
1099 : case 1:
1100 0 : if (write)
1101 0 : outb(*(u8 *)buf, port);
1102 : else
1103 0 : *(u8 *)buf = inb(port);
1104 : return 1;
1105 : case 2:
1106 0 : if (write)
1107 0 : outw(*(u16 *)buf, port);
1108 : else
1109 0 : *(u16 *)buf = inw(port);
1110 : return 2;
1111 : case 4:
1112 0 : if (write)
1113 0 : outl(*(u32 *)buf, port);
1114 : else
1115 0 : *(u32 *)buf = inl(port);
1116 : return 4;
1117 : }
1118 : return -EINVAL;
1119 : }
1120 :
1121 0 : static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1122 : struct bin_attribute *attr, char *buf,
1123 : loff_t off, size_t count)
1124 : {
1125 0 : return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1126 : }
1127 :
1128 0 : static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1129 : struct bin_attribute *attr, char *buf,
1130 : loff_t off, size_t count)
1131 : {
1132 : int ret;
1133 :
1134 0 : ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1135 : if (ret)
1136 : return ret;
1137 :
1138 0 : return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1139 : }
1140 :
1141 : /**
1142 : * pci_remove_resource_files - cleanup resource files
1143 : * @pdev: dev to cleanup
1144 : *
1145 : * If we created resource files for @pdev, remove them from sysfs and
1146 : * free their resources.
1147 : */
1148 0 : static void pci_remove_resource_files(struct pci_dev *pdev)
1149 : {
1150 : int i;
1151 :
1152 0 : for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1153 : struct bin_attribute *res_attr;
1154 :
1155 0 : res_attr = pdev->res_attr[i];
1156 0 : if (res_attr) {
1157 0 : sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1158 0 : kfree(res_attr);
1159 : }
1160 :
1161 0 : res_attr = pdev->res_attr_wc[i];
1162 0 : if (res_attr) {
1163 0 : sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1164 0 : kfree(res_attr);
1165 : }
1166 : }
1167 0 : }
1168 :
1169 0 : static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1170 : {
1171 : /* allocate attribute structure, piggyback attribute name */
1172 0 : int name_len = write_combine ? 13 : 10;
1173 : struct bin_attribute *res_attr;
1174 : char *res_attr_name;
1175 : int retval;
1176 :
1177 0 : res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1178 0 : if (!res_attr)
1179 : return -ENOMEM;
1180 :
1181 0 : res_attr_name = (char *)(res_attr + 1);
1182 :
1183 : sysfs_bin_attr_init(res_attr);
1184 0 : if (write_combine) {
1185 0 : sprintf(res_attr_name, "resource%d_wc", num);
1186 0 : res_attr->mmap = pci_mmap_resource_wc;
1187 : } else {
1188 0 : sprintf(res_attr_name, "resource%d", num);
1189 0 : if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1190 0 : res_attr->read = pci_read_resource_io;
1191 0 : res_attr->write = pci_write_resource_io;
1192 : if (arch_can_pci_mmap_io())
1193 : res_attr->mmap = pci_mmap_resource_uc;
1194 : } else {
1195 0 : res_attr->mmap = pci_mmap_resource_uc;
1196 : }
1197 : }
1198 0 : if (res_attr->mmap)
1199 0 : res_attr->f_mapping = iomem_get_mapping;
1200 0 : res_attr->attr.name = res_attr_name;
1201 0 : res_attr->attr.mode = 0600;
1202 0 : res_attr->size = pci_resource_len(pdev, num);
1203 0 : res_attr->private = (void *)(unsigned long)num;
1204 0 : retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1205 0 : if (retval) {
1206 0 : kfree(res_attr);
1207 0 : return retval;
1208 : }
1209 :
1210 0 : if (write_combine)
1211 0 : pdev->res_attr_wc[num] = res_attr;
1212 : else
1213 0 : pdev->res_attr[num] = res_attr;
1214 :
1215 : return 0;
1216 : }
1217 :
1218 : /**
1219 : * pci_create_resource_files - create resource files in sysfs for @dev
1220 : * @pdev: dev in question
1221 : *
1222 : * Walk the resources in @pdev creating files for each resource available.
1223 : */
1224 0 : static int pci_create_resource_files(struct pci_dev *pdev)
1225 : {
1226 : int i;
1227 : int retval;
1228 :
1229 : /* Expose the PCI resources from this device as files */
1230 0 : for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1231 :
1232 : /* skip empty resources */
1233 0 : if (!pci_resource_len(pdev, i))
1234 0 : continue;
1235 :
1236 0 : retval = pci_create_attr(pdev, i, 0);
1237 : /* for prefetchable resources, create a WC mappable file */
1238 : if (!retval && arch_can_pci_mmap_wc() &&
1239 : pdev->resource[i].flags & IORESOURCE_PREFETCH)
1240 : retval = pci_create_attr(pdev, i, 1);
1241 0 : if (retval) {
1242 0 : pci_remove_resource_files(pdev);
1243 0 : return retval;
1244 : }
1245 : }
1246 : return 0;
1247 : }
1248 : #else /* !(defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)) */
1249 : int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1250 : void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1251 : #endif
1252 :
1253 : /**
1254 : * pci_write_rom - used to enable access to the PCI ROM display
1255 : * @filp: sysfs file
1256 : * @kobj: kernel object handle
1257 : * @bin_attr: struct bin_attribute for this file
1258 : * @buf: user input
1259 : * @off: file offset
1260 : * @count: number of byte in input
1261 : *
1262 : * writing anything except 0 enables it
1263 : */
1264 0 : static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1265 : struct bin_attribute *bin_attr, char *buf,
1266 : loff_t off, size_t count)
1267 : {
1268 0 : struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1269 :
1270 0 : if ((off == 0) && (*buf == '0') && (count == 2))
1271 0 : pdev->rom_attr_enabled = 0;
1272 : else
1273 0 : pdev->rom_attr_enabled = 1;
1274 :
1275 0 : return count;
1276 : }
1277 :
1278 : /**
1279 : * pci_read_rom - read a PCI ROM
1280 : * @filp: sysfs file
1281 : * @kobj: kernel object handle
1282 : * @bin_attr: struct bin_attribute for this file
1283 : * @buf: where to put the data we read from the ROM
1284 : * @off: file offset
1285 : * @count: number of bytes to read
1286 : *
1287 : * Put @count bytes starting at @off into @buf from the ROM in the PCI
1288 : * device corresponding to @kobj.
1289 : */
1290 0 : static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1291 : struct bin_attribute *bin_attr, char *buf,
1292 : loff_t off, size_t count)
1293 : {
1294 0 : struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1295 : void __iomem *rom;
1296 : size_t size;
1297 :
1298 0 : if (!pdev->rom_attr_enabled)
1299 : return -EINVAL;
1300 :
1301 0 : rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1302 0 : if (!rom || !size)
1303 : return -EIO;
1304 :
1305 0 : if (off >= size)
1306 : count = 0;
1307 : else {
1308 0 : if (off + count > size)
1309 0 : count = size - off;
1310 :
1311 0 : memcpy_fromio(buf, rom + off, count);
1312 : }
1313 0 : pci_unmap_rom(pdev, rom);
1314 :
1315 0 : return count;
1316 : }
1317 : static BIN_ATTR(rom, 0600, pci_read_rom, pci_write_rom, 0);
1318 :
1319 : static struct bin_attribute *pci_dev_rom_attrs[] = {
1320 : &bin_attr_rom,
1321 : NULL,
1322 : };
1323 :
1324 0 : static umode_t pci_dev_rom_attr_is_visible(struct kobject *kobj,
1325 : struct bin_attribute *a, int n)
1326 : {
1327 0 : struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1328 : size_t rom_size;
1329 :
1330 : /* If the device has a ROM, try to expose it in sysfs. */
1331 0 : rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1332 0 : if (!rom_size)
1333 : return 0;
1334 :
1335 0 : a->size = rom_size;
1336 :
1337 0 : return a->attr.mode;
1338 : }
1339 :
1340 : static const struct attribute_group pci_dev_rom_attr_group = {
1341 : .bin_attrs = pci_dev_rom_attrs,
1342 : .is_bin_visible = pci_dev_rom_attr_is_visible,
1343 : };
1344 :
1345 0 : static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1346 : const char *buf, size_t count)
1347 : {
1348 0 : struct pci_dev *pdev = to_pci_dev(dev);
1349 : unsigned long val;
1350 : ssize_t result;
1351 :
1352 0 : if (kstrtoul(buf, 0, &val) < 0)
1353 : return -EINVAL;
1354 :
1355 0 : if (val != 1)
1356 : return -EINVAL;
1357 :
1358 0 : pm_runtime_get_sync(dev);
1359 0 : result = pci_reset_function(pdev);
1360 0 : pm_runtime_put(dev);
1361 0 : if (result < 0)
1362 : return result;
1363 :
1364 0 : return count;
1365 : }
1366 : static DEVICE_ATTR_WO(reset);
1367 :
1368 : static struct attribute *pci_dev_reset_attrs[] = {
1369 : &dev_attr_reset.attr,
1370 : NULL,
1371 : };
1372 :
1373 0 : static umode_t pci_dev_reset_attr_is_visible(struct kobject *kobj,
1374 : struct attribute *a, int n)
1375 : {
1376 0 : struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1377 :
1378 0 : if (!pci_reset_supported(pdev))
1379 : return 0;
1380 :
1381 0 : return a->mode;
1382 : }
1383 :
1384 : static const struct attribute_group pci_dev_reset_attr_group = {
1385 : .attrs = pci_dev_reset_attrs,
1386 : .is_visible = pci_dev_reset_attr_is_visible,
1387 : };
1388 :
1389 : #define pci_dev_resource_resize_attr(n) \
1390 : static ssize_t resource##n##_resize_show(struct device *dev, \
1391 : struct device_attribute *attr, \
1392 : char * buf) \
1393 : { \
1394 : struct pci_dev *pdev = to_pci_dev(dev); \
1395 : ssize_t ret; \
1396 : \
1397 : pci_config_pm_runtime_get(pdev); \
1398 : \
1399 : ret = sysfs_emit(buf, "%016llx\n", \
1400 : (u64)pci_rebar_get_possible_sizes(pdev, n)); \
1401 : \
1402 : pci_config_pm_runtime_put(pdev); \
1403 : \
1404 : return ret; \
1405 : } \
1406 : \
1407 : static ssize_t resource##n##_resize_store(struct device *dev, \
1408 : struct device_attribute *attr,\
1409 : const char *buf, size_t count)\
1410 : { \
1411 : struct pci_dev *pdev = to_pci_dev(dev); \
1412 : unsigned long size, flags; \
1413 : int ret, i; \
1414 : u16 cmd; \
1415 : \
1416 : if (kstrtoul(buf, 0, &size) < 0) \
1417 : return -EINVAL; \
1418 : \
1419 : device_lock(dev); \
1420 : if (dev->driver) { \
1421 : ret = -EBUSY; \
1422 : goto unlock; \
1423 : } \
1424 : \
1425 : pci_config_pm_runtime_get(pdev); \
1426 : \
1427 : if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) { \
1428 : ret = aperture_remove_conflicting_pci_devices(pdev, \
1429 : "resourceN_resize"); \
1430 : if (ret) \
1431 : goto pm_put; \
1432 : } \
1433 : \
1434 : pci_read_config_word(pdev, PCI_COMMAND, &cmd); \
1435 : pci_write_config_word(pdev, PCI_COMMAND, \
1436 : cmd & ~PCI_COMMAND_MEMORY); \
1437 : \
1438 : flags = pci_resource_flags(pdev, n); \
1439 : \
1440 : pci_remove_resource_files(pdev); \
1441 : \
1442 : for (i = 0; i < PCI_STD_NUM_BARS; i++) { \
1443 : if (pci_resource_len(pdev, i) && \
1444 : pci_resource_flags(pdev, i) == flags) \
1445 : pci_release_resource(pdev, i); \
1446 : } \
1447 : \
1448 : ret = pci_resize_resource(pdev, n, size); \
1449 : \
1450 : pci_assign_unassigned_bus_resources(pdev->bus); \
1451 : \
1452 : if (pci_create_resource_files(pdev)) \
1453 : pci_warn(pdev, "Failed to recreate resource files after BAR resizing\n");\
1454 : \
1455 : pci_write_config_word(pdev, PCI_COMMAND, cmd); \
1456 : pm_put: \
1457 : pci_config_pm_runtime_put(pdev); \
1458 : unlock: \
1459 : device_unlock(dev); \
1460 : \
1461 : return ret ? ret : count; \
1462 : } \
1463 : static DEVICE_ATTR_RW(resource##n##_resize)
1464 :
1465 0 : pci_dev_resource_resize_attr(0);
1466 0 : pci_dev_resource_resize_attr(1);
1467 0 : pci_dev_resource_resize_attr(2);
1468 0 : pci_dev_resource_resize_attr(3);
1469 0 : pci_dev_resource_resize_attr(4);
1470 0 : pci_dev_resource_resize_attr(5);
1471 :
1472 : static struct attribute *resource_resize_attrs[] = {
1473 : &dev_attr_resource0_resize.attr,
1474 : &dev_attr_resource1_resize.attr,
1475 : &dev_attr_resource2_resize.attr,
1476 : &dev_attr_resource3_resize.attr,
1477 : &dev_attr_resource4_resize.attr,
1478 : &dev_attr_resource5_resize.attr,
1479 : NULL,
1480 : };
1481 :
1482 0 : static umode_t resource_resize_is_visible(struct kobject *kobj,
1483 : struct attribute *a, int n)
1484 : {
1485 0 : struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1486 :
1487 0 : return pci_rebar_get_current_size(pdev, n) < 0 ? 0 : a->mode;
1488 : }
1489 :
1490 : static const struct attribute_group pci_dev_resource_resize_group = {
1491 : .attrs = resource_resize_attrs,
1492 : .is_visible = resource_resize_is_visible,
1493 : };
1494 :
1495 0 : int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1496 : {
1497 0 : if (!sysfs_initialized)
1498 : return -EACCES;
1499 :
1500 0 : return pci_create_resource_files(pdev);
1501 : }
1502 :
1503 : /**
1504 : * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1505 : * @pdev: device whose entries we should free
1506 : *
1507 : * Cleanup when @pdev is removed from sysfs.
1508 : */
1509 0 : void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1510 : {
1511 0 : if (!sysfs_initialized)
1512 : return;
1513 :
1514 0 : pci_remove_resource_files(pdev);
1515 : }
1516 :
1517 1 : static int __init pci_sysfs_init(void)
1518 : {
1519 1 : struct pci_dev *pdev = NULL;
1520 1 : struct pci_bus *pbus = NULL;
1521 : int retval;
1522 :
1523 1 : sysfs_initialized = 1;
1524 2 : for_each_pci_dev(pdev) {
1525 0 : retval = pci_create_sysfs_dev_files(pdev);
1526 0 : if (retval) {
1527 0 : pci_dev_put(pdev);
1528 0 : return retval;
1529 : }
1530 : }
1531 :
1532 1 : while ((pbus = pci_find_next_bus(pbus)))
1533 : pci_create_legacy_files(pbus);
1534 :
1535 : return 0;
1536 : }
1537 : late_initcall(pci_sysfs_init);
1538 :
1539 : static struct attribute *pci_dev_dev_attrs[] = {
1540 : &dev_attr_boot_vga.attr,
1541 : NULL,
1542 : };
1543 :
1544 0 : static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1545 : struct attribute *a, int n)
1546 : {
1547 0 : struct device *dev = kobj_to_dev(kobj);
1548 0 : struct pci_dev *pdev = to_pci_dev(dev);
1549 :
1550 0 : if (a == &dev_attr_boot_vga.attr)
1551 0 : if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1552 : return 0;
1553 :
1554 0 : return a->mode;
1555 : }
1556 :
1557 : static struct attribute *pci_dev_hp_attrs[] = {
1558 : &dev_attr_remove.attr,
1559 : &dev_attr_dev_rescan.attr,
1560 : NULL,
1561 : };
1562 :
1563 0 : static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1564 : struct attribute *a, int n)
1565 : {
1566 0 : struct device *dev = kobj_to_dev(kobj);
1567 0 : struct pci_dev *pdev = to_pci_dev(dev);
1568 :
1569 0 : if (pdev->is_virtfn)
1570 : return 0;
1571 :
1572 0 : return a->mode;
1573 : }
1574 :
1575 0 : static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1576 : struct attribute *a, int n)
1577 : {
1578 0 : struct device *dev = kobj_to_dev(kobj);
1579 0 : struct pci_dev *pdev = to_pci_dev(dev);
1580 :
1581 0 : if (pci_is_bridge(pdev))
1582 0 : return a->mode;
1583 :
1584 : return 0;
1585 : }
1586 :
1587 0 : static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1588 : struct attribute *a, int n)
1589 : {
1590 0 : struct device *dev = kobj_to_dev(kobj);
1591 0 : struct pci_dev *pdev = to_pci_dev(dev);
1592 :
1593 0 : if (pci_is_pcie(pdev))
1594 0 : return a->mode;
1595 :
1596 : return 0;
1597 : }
1598 :
1599 : static const struct attribute_group pci_dev_group = {
1600 : .attrs = pci_dev_attrs,
1601 : };
1602 :
1603 : const struct attribute_group *pci_dev_groups[] = {
1604 : &pci_dev_group,
1605 : &pci_dev_config_attr_group,
1606 : &pci_dev_rom_attr_group,
1607 : &pci_dev_reset_attr_group,
1608 : &pci_dev_reset_method_attr_group,
1609 : &pci_dev_vpd_attr_group,
1610 : #ifdef CONFIG_DMI
1611 : &pci_dev_smbios_attr_group,
1612 : #endif
1613 : #ifdef CONFIG_ACPI
1614 : &pci_dev_acpi_attr_group,
1615 : #endif
1616 : &pci_dev_resource_resize_group,
1617 : NULL,
1618 : };
1619 :
1620 : static const struct attribute_group pci_dev_hp_attr_group = {
1621 : .attrs = pci_dev_hp_attrs,
1622 : .is_visible = pci_dev_hp_attrs_are_visible,
1623 : };
1624 :
1625 : static const struct attribute_group pci_dev_attr_group = {
1626 : .attrs = pci_dev_dev_attrs,
1627 : .is_visible = pci_dev_attrs_are_visible,
1628 : };
1629 :
1630 : static const struct attribute_group pci_bridge_attr_group = {
1631 : .attrs = pci_bridge_attrs,
1632 : .is_visible = pci_bridge_attrs_are_visible,
1633 : };
1634 :
1635 : static const struct attribute_group pcie_dev_attr_group = {
1636 : .attrs = pcie_dev_attrs,
1637 : .is_visible = pcie_dev_attrs_are_visible,
1638 : };
1639 :
1640 : static const struct attribute_group *pci_dev_attr_groups[] = {
1641 : &pci_dev_attr_group,
1642 : &pci_dev_hp_attr_group,
1643 : #ifdef CONFIG_PCI_IOV
1644 : &sriov_pf_dev_attr_group,
1645 : &sriov_vf_dev_attr_group,
1646 : #endif
1647 : &pci_bridge_attr_group,
1648 : &pcie_dev_attr_group,
1649 : #ifdef CONFIG_PCIEAER
1650 : &aer_stats_attr_group,
1651 : #endif
1652 : #ifdef CONFIG_PCIEASPM
1653 : &aspm_ctrl_attr_group,
1654 : #endif
1655 : NULL,
1656 : };
1657 :
1658 : const struct device_type pci_dev_type = {
1659 : .groups = pci_dev_attr_groups,
1660 : };
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