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Linux 4.19.133
[linux/fpc-iii.git] / drivers / pci / pci-sysfs.c
blob1edf5a1836ea92880b74a13c421eadf891dc3404
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/of.h>
30 #include "pci.h"
31
32 static int sysfs_initialized; /* = 0 */
33
34 /* show configuration fields */
35 #define pci_config_attr(field, format_string) \
36 static ssize_t \
37 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
38 { \
39 struct pci_dev *pdev; \
40 \
41 pdev = to_pci_dev(dev); \
42 return sprintf(buf, format_string, pdev->field); \
43 } \
44 static DEVICE_ATTR_RO(field)
45
46 pci_config_attr(vendor, "0x%04x\n");
47 pci_config_attr(device, "0x%04x\n");
48 pci_config_attr(subsystem_vendor, "0x%04x\n");
49 pci_config_attr(subsystem_device, "0x%04x\n");
50 pci_config_attr(revision, "0x%02x\n");
51 pci_config_attr(class, "0x%06x\n");
52 pci_config_attr(irq, "%u\n");
53
54 static ssize_t broken_parity_status_show(struct device *dev,
55 struct device_attribute *attr,
56 char *buf)
57 {
58 struct pci_dev *pdev = to_pci_dev(dev);
59 return sprintf(buf, "%u\n", pdev->broken_parity_status);
60 }
61
62 static ssize_t broken_parity_status_store(struct device *dev,
63 struct device_attribute *attr,
64 const char *buf, size_t count)
65 {
66 struct pci_dev *pdev = to_pci_dev(dev);
67 unsigned long val;
68
69 if (kstrtoul(buf, 0, &val) < 0)
70 return -EINVAL;
71
72 pdev->broken_parity_status = !!val;
73
74 return count;
75 }
76 static DEVICE_ATTR_RW(broken_parity_status);
77
78 static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
79 struct device_attribute *attr, char *buf)
80 {
81 const struct cpumask *mask;
82
83 #ifdef CONFIG_NUMA
84 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
85 cpumask_of_node(dev_to_node(dev));
86 #else
87 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
88 #endif
89 return cpumap_print_to_pagebuf(list, buf, mask);
90 }
91
92 static ssize_t local_cpus_show(struct device *dev,
93 struct device_attribute *attr, char *buf)
94 {
95 return pci_dev_show_local_cpu(dev, false, attr, buf);
96 }
97 static DEVICE_ATTR_RO(local_cpus);
98
99 static ssize_t local_cpulist_show(struct device *dev,
100 struct device_attribute *attr, char *buf)
101 {
102 return pci_dev_show_local_cpu(dev, true, attr, buf);
103 }
104 static DEVICE_ATTR_RO(local_cpulist);
105
106 /*
107 * PCI Bus Class Devices
108 */
109 static ssize_t cpuaffinity_show(struct device *dev,
110 struct device_attribute *attr, char *buf)
111 {
112 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
113
114 return cpumap_print_to_pagebuf(false, buf, cpumask);
115 }
116 static DEVICE_ATTR_RO(cpuaffinity);
117
118 static ssize_t cpulistaffinity_show(struct device *dev,
119 struct device_attribute *attr, char *buf)
120 {
121 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
122
123 return cpumap_print_to_pagebuf(true, buf, cpumask);
124 }
125 static DEVICE_ATTR_RO(cpulistaffinity);
126
127 /* show resources */
128 static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
129 char *buf)
130 {
131 struct pci_dev *pci_dev = to_pci_dev(dev);
132 char *str = buf;
133 int i;
134 int max;
135 resource_size_t start, end;
136
137 if (pci_dev->subordinate)
138 max = DEVICE_COUNT_RESOURCE;
139 else
140 max = PCI_BRIDGE_RESOURCES;
141
142 for (i = 0; i < max; i++) {
143 struct resource *res = &pci_dev->resource[i];
144 pci_resource_to_user(pci_dev, i, res, &start, &end);
145 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
146 (unsigned long long)start,
147 (unsigned long long)end,
148 (unsigned long long)res->flags);
149 }
150 return (str - buf);
151 }
152 static DEVICE_ATTR_RO(resource);
153
154 static ssize_t max_link_speed_show(struct device *dev,
155 struct device_attribute *attr, char *buf)
156 {
157 struct pci_dev *pdev = to_pci_dev(dev);
158
159 return sprintf(buf, "%s\n", PCIE_SPEED2STR(pcie_get_speed_cap(pdev)));
160 }
161 static DEVICE_ATTR_RO(max_link_speed);
162
163 static ssize_t max_link_width_show(struct device *dev,
164 struct device_attribute *attr, char *buf)
165 {
166 struct pci_dev *pdev = to_pci_dev(dev);
167
168 return sprintf(buf, "%u\n", pcie_get_width_cap(pdev));
169 }
170 static DEVICE_ATTR_RO(max_link_width);
171
172 static ssize_t current_link_speed_show(struct device *dev,
173 struct device_attribute *attr, char *buf)
174 {
175 struct pci_dev *pci_dev = to_pci_dev(dev);
176 u16 linkstat;
177 int err;
178 const char *speed;
179
180 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
181 if (err)
182 return -EINVAL;
183
184 switch (linkstat & PCI_EXP_LNKSTA_CLS) {
185 case PCI_EXP_LNKSTA_CLS_16_0GB:
186 speed = "16 GT/s";
187 break;
188 case PCI_EXP_LNKSTA_CLS_8_0GB:
189 speed = "8 GT/s";
190 break;
191 case PCI_EXP_LNKSTA_CLS_5_0GB:
192 speed = "5 GT/s";
193 break;
194 case PCI_EXP_LNKSTA_CLS_2_5GB:
195 speed = "2.5 GT/s";
196 break;
197 default:
198 speed = "Unknown speed";
199 }
200
201 return sprintf(buf, "%s\n", speed);
202 }
203 static DEVICE_ATTR_RO(current_link_speed);
204
205 static ssize_t current_link_width_show(struct device *dev,
206 struct device_attribute *attr, char *buf)
207 {
208 struct pci_dev *pci_dev = to_pci_dev(dev);
209 u16 linkstat;
210 int err;
211
212 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
213 if (err)
214 return -EINVAL;
215
216 return sprintf(buf, "%u\n",
217 (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
218 }
219 static DEVICE_ATTR_RO(current_link_width);
220
221 static ssize_t secondary_bus_number_show(struct device *dev,
222 struct device_attribute *attr,
223 char *buf)
224 {
225 struct pci_dev *pci_dev = to_pci_dev(dev);
226 u8 sec_bus;
227 int err;
228
229 err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
230 if (err)
231 return -EINVAL;
232
233 return sprintf(buf, "%u\n", sec_bus);
234 }
235 static DEVICE_ATTR_RO(secondary_bus_number);
236
237 static ssize_t subordinate_bus_number_show(struct device *dev,
238 struct device_attribute *attr,
239 char *buf)
240 {
241 struct pci_dev *pci_dev = to_pci_dev(dev);
242 u8 sub_bus;
243 int err;
244
245 err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
246 if (err)
247 return -EINVAL;
248
249 return sprintf(buf, "%u\n", sub_bus);
250 }
251 static DEVICE_ATTR_RO(subordinate_bus_number);
252
253 static ssize_t ari_enabled_show(struct device *dev,
254 struct device_attribute *attr,
255 char *buf)
256 {
257 struct pci_dev *pci_dev = to_pci_dev(dev);
258
259 return sprintf(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
260 }
261 static DEVICE_ATTR_RO(ari_enabled);
262
263 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
264 char *buf)
265 {
266 struct pci_dev *pci_dev = to_pci_dev(dev);
267
268 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
269 pci_dev->vendor, pci_dev->device,
270 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
271 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
272 (u8)(pci_dev->class));
273 }
274 static DEVICE_ATTR_RO(modalias);
275
276 static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
277 const char *buf, size_t count)
278 {
279 struct pci_dev *pdev = to_pci_dev(dev);
280 unsigned long val;
281 ssize_t result = kstrtoul(buf, 0, &val);
282
283 if (result < 0)
284 return result;
285
286 /* this can crash the machine when done on the "wrong" device */
287 if (!capable(CAP_SYS_ADMIN))
288 return -EPERM;
289
290 device_lock(dev);
291 if (dev->driver)
292 result = -EBUSY;
293 else if (val)
294 result = pci_enable_device(pdev);
295 else if (pci_is_enabled(pdev))
296 pci_disable_device(pdev);
297 else
298 result = -EIO;
299 device_unlock(dev);
300
301 return result < 0 ? result : count;
302 }
303
304 static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
305 char *buf)
306 {
307 struct pci_dev *pdev;
308
309 pdev = to_pci_dev(dev);
310 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
311 }
312 static DEVICE_ATTR_RW(enable);
313
314 #ifdef CONFIG_NUMA
315 static ssize_t numa_node_store(struct device *dev,
316 struct device_attribute *attr, const char *buf,
317 size_t count)
318 {
319 struct pci_dev *pdev = to_pci_dev(dev);
320 int node, ret;
321
322 if (!capable(CAP_SYS_ADMIN))
323 return -EPERM;
324
325 ret = kstrtoint(buf, 0, &node);
326 if (ret)
327 return ret;
328
329 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
330 return -EINVAL;
331
332 if (node != NUMA_NO_NODE && !node_online(node))
333 return -EINVAL;
334
335 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
336 pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
337 node);
338
339 dev->numa_node = node;
340 return count;
341 }
342
343 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
344 char *buf)
345 {
346 return sprintf(buf, "%d\n", dev->numa_node);
347 }
348 static DEVICE_ATTR_RW(numa_node);
349 #endif
350
351 static ssize_t dma_mask_bits_show(struct device *dev,
352 struct device_attribute *attr, char *buf)
353 {
354 struct pci_dev *pdev = to_pci_dev(dev);
355
356 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
357 }
358 static DEVICE_ATTR_RO(dma_mask_bits);
359
360 static ssize_t consistent_dma_mask_bits_show(struct device *dev,
361 struct device_attribute *attr,
362 char *buf)
363 {
364 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
365 }
366 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
367
368 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
369 char *buf)
370 {
371 struct pci_dev *pdev = to_pci_dev(dev);
372 struct pci_bus *subordinate = pdev->subordinate;
373
374 return sprintf(buf, "%u\n", subordinate ?
375 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
376 : !pdev->no_msi);
377 }
378
379 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
380 const char *buf, size_t count)
381 {
382 struct pci_dev *pdev = to_pci_dev(dev);
383 struct pci_bus *subordinate = pdev->subordinate;
384 unsigned long val;
385
386 if (kstrtoul(buf, 0, &val) < 0)
387 return -EINVAL;
388
389 if (!capable(CAP_SYS_ADMIN))
390 return -EPERM;
391
392 /*
393 * "no_msi" and "bus_flags" only affect what happens when a driver
394 * requests MSI or MSI-X. They don't affect any drivers that have
395 * already requested MSI or MSI-X.
396 */
397 if (!subordinate) {
398 pdev->no_msi = !val;
399 pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
400 val ? "allowed" : "disallowed");
401 return count;
402 }
403
404 if (val)
405 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
406 else
407 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
408
409 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
410 val ? "allowed" : "disallowed");
411 return count;
412 }
413 static DEVICE_ATTR_RW(msi_bus);
414
415 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
416 size_t count)
417 {
418 unsigned long val;
419 struct pci_bus *b = NULL;
420
421 if (kstrtoul(buf, 0, &val) < 0)
422 return -EINVAL;
423
424 if (val) {
425 pci_lock_rescan_remove();
426 while ((b = pci_find_next_bus(b)) != NULL)
427 pci_rescan_bus(b);
428 pci_unlock_rescan_remove();
429 }
430 return count;
431 }
432 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
433
434 static struct attribute *pci_bus_attrs[] = {
435 &bus_attr_rescan.attr,
436 NULL,
437 };
438
439 static const struct attribute_group pci_bus_group = {
440 .attrs = pci_bus_attrs,
441 };
442
443 const struct attribute_group *pci_bus_groups[] = {
444 &pci_bus_group,
445 NULL,
446 };
447
448 static ssize_t dev_rescan_store(struct device *dev,
449 struct device_attribute *attr, const char *buf,
450 size_t count)
451 {
452 unsigned long val;
453 struct pci_dev *pdev = to_pci_dev(dev);
454
455 if (kstrtoul(buf, 0, &val) < 0)
456 return -EINVAL;
457
458 if (val) {
459 pci_lock_rescan_remove();
460 pci_rescan_bus(pdev->bus);
461 pci_unlock_rescan_remove();
462 }
463 return count;
464 }
465 static struct device_attribute dev_rescan_attr = __ATTR(rescan,
466 (S_IWUSR|S_IWGRP),
467 NULL, dev_rescan_store);
468
469 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
470 const char *buf, size_t count)
471 {
472 unsigned long val;
473
474 if (kstrtoul(buf, 0, &val) < 0)
475 return -EINVAL;
476
477 if (val && device_remove_file_self(dev, attr))
478 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
479 return count;
480 }
481 static struct device_attribute dev_remove_attr = __ATTR_IGNORE_LOCKDEP(remove,
482 (S_IWUSR|S_IWGRP),
483 NULL, remove_store);
484
485 static ssize_t dev_bus_rescan_store(struct device *dev,
486 struct device_attribute *attr,
487 const char *buf, size_t count)
488 {
489 unsigned long val;
490 struct pci_bus *bus = to_pci_bus(dev);
491
492 if (kstrtoul(buf, 0, &val) < 0)
493 return -EINVAL;
494
495 if (val) {
496 pci_lock_rescan_remove();
497 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
498 pci_rescan_bus_bridge_resize(bus->self);
499 else
500 pci_rescan_bus(bus);
501 pci_unlock_rescan_remove();
502 }
503 return count;
504 }
505 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
506
507 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
508 static ssize_t d3cold_allowed_store(struct device *dev,
509 struct device_attribute *attr,
510 const char *buf, size_t count)
511 {
512 struct pci_dev *pdev = to_pci_dev(dev);
513 unsigned long val;
514
515 if (kstrtoul(buf, 0, &val) < 0)
516 return -EINVAL;
517
518 pdev->d3cold_allowed = !!val;
519 if (pdev->d3cold_allowed)
520 pci_d3cold_enable(pdev);
521 else
522 pci_d3cold_disable(pdev);
523
524 pm_runtime_resume(dev);
525
526 return count;
527 }
528
529 static ssize_t d3cold_allowed_show(struct device *dev,
530 struct device_attribute *attr, char *buf)
531 {
532 struct pci_dev *pdev = to_pci_dev(dev);
533 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
534 }
535 static DEVICE_ATTR_RW(d3cold_allowed);
536 #endif
537
538 #ifdef CONFIG_OF
539 static ssize_t devspec_show(struct device *dev,
540 struct device_attribute *attr, char *buf)
541 {
542 struct pci_dev *pdev = to_pci_dev(dev);
543 struct device_node *np = pci_device_to_OF_node(pdev);
544
545 if (np == NULL)
546 return 0;
547 return sprintf(buf, "%pOF", np);
548 }
549 static DEVICE_ATTR_RO(devspec);
550 #endif
551
552 #ifdef CONFIG_PCI_IOV
553 static ssize_t sriov_totalvfs_show(struct device *dev,
554 struct device_attribute *attr,
555 char *buf)
556 {
557 struct pci_dev *pdev = to_pci_dev(dev);
558
559 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
560 }
561
562
563 static ssize_t sriov_numvfs_show(struct device *dev,
564 struct device_attribute *attr,
565 char *buf)
566 {
567 struct pci_dev *pdev = to_pci_dev(dev);
568
569 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
570 }
571
572 /*
573 * num_vfs > 0; number of VFs to enable
574 * num_vfs = 0; disable all VFs
575 *
576 * Note: SRIOV spec doesn't allow partial VF
577 * disable, so it's all or none.
578 */
579 static ssize_t sriov_numvfs_store(struct device *dev,
580 struct device_attribute *attr,
581 const char *buf, size_t count)
582 {
583 struct pci_dev *pdev = to_pci_dev(dev);
584 int ret;
585 u16 num_vfs;
586
587 ret = kstrtou16(buf, 0, &num_vfs);
588 if (ret < 0)
589 return ret;
590
591 if (num_vfs > pci_sriov_get_totalvfs(pdev))
592 return -ERANGE;
593
594 device_lock(&pdev->dev);
595
596 if (num_vfs == pdev->sriov->num_VFs)
597 goto exit;
598
599 /* is PF driver loaded w/callback */
600 if (!pdev->driver || !pdev->driver->sriov_configure) {
601 pci_info(pdev, "Driver doesn't support SRIOV configuration via sysfs\n");
602 ret = -ENOENT;
603 goto exit;
604 }
605
606 if (num_vfs == 0) {
607 /* disable VFs */
608 ret = pdev->driver->sriov_configure(pdev, 0);
609 goto exit;
610 }
611
612 /* enable VFs */
613 if (pdev->sriov->num_VFs) {
614 pci_warn(pdev, "%d VFs already enabled. Disable before enabling %d VFs\n",
615 pdev->sriov->num_VFs, num_vfs);
616 ret = -EBUSY;
617 goto exit;
618 }
619
620 ret = pdev->driver->sriov_configure(pdev, num_vfs);
621 if (ret < 0)
622 goto exit;
623
624 if (ret != num_vfs)
625 pci_warn(pdev, "%d VFs requested; only %d enabled\n",
626 num_vfs, ret);
627
628 exit:
629 device_unlock(&pdev->dev);
630
631 if (ret < 0)
632 return ret;
633
634 return count;
635 }
636
637 static ssize_t sriov_offset_show(struct device *dev,
638 struct device_attribute *attr,
639 char *buf)
640 {
641 struct pci_dev *pdev = to_pci_dev(dev);
642
643 return sprintf(buf, "%u\n", pdev->sriov->offset);
644 }
645
646 static ssize_t sriov_stride_show(struct device *dev,
647 struct device_attribute *attr,
648 char *buf)
649 {
650 struct pci_dev *pdev = to_pci_dev(dev);
651
652 return sprintf(buf, "%u\n", pdev->sriov->stride);
653 }
654
655 static ssize_t sriov_vf_device_show(struct device *dev,
656 struct device_attribute *attr,
657 char *buf)
658 {
659 struct pci_dev *pdev = to_pci_dev(dev);
660
661 return sprintf(buf, "%x\n", pdev->sriov->vf_device);
662 }
663
664 static ssize_t sriov_drivers_autoprobe_show(struct device *dev,
665 struct device_attribute *attr,
666 char *buf)
667 {
668 struct pci_dev *pdev = to_pci_dev(dev);
669
670 return sprintf(buf, "%u\n", pdev->sriov->drivers_autoprobe);
671 }
672
673 static ssize_t sriov_drivers_autoprobe_store(struct device *dev,
674 struct device_attribute *attr,
675 const char *buf, size_t count)
676 {
677 struct pci_dev *pdev = to_pci_dev(dev);
678 bool drivers_autoprobe;
679
680 if (kstrtobool(buf, &drivers_autoprobe) < 0)
681 return -EINVAL;
682
683 pdev->sriov->drivers_autoprobe = drivers_autoprobe;
684
685 return count;
686 }
687
688 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
689 static struct device_attribute sriov_numvfs_attr =
690 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
691 sriov_numvfs_show, sriov_numvfs_store);
692 static struct device_attribute sriov_offset_attr = __ATTR_RO(sriov_offset);
693 static struct device_attribute sriov_stride_attr = __ATTR_RO(sriov_stride);
694 static struct device_attribute sriov_vf_device_attr = __ATTR_RO(sriov_vf_device);
695 static struct device_attribute sriov_drivers_autoprobe_attr =
696 __ATTR(sriov_drivers_autoprobe, (S_IRUGO|S_IWUSR|S_IWGRP),
697 sriov_drivers_autoprobe_show, sriov_drivers_autoprobe_store);
698 #endif /* CONFIG_PCI_IOV */
699
700 static ssize_t driver_override_store(struct device *dev,
701 struct device_attribute *attr,
702 const char *buf, size_t count)
703 {
704 struct pci_dev *pdev = to_pci_dev(dev);
705 char *driver_override, *old, *cp;
706
707 /* We need to keep extra room for a newline */
708 if (count >= (PAGE_SIZE - 1))
709 return -EINVAL;
710
711 driver_override = kstrndup(buf, count, GFP_KERNEL);
712 if (!driver_override)
713 return -ENOMEM;
714
715 cp = strchr(driver_override, '\n');
716 if (cp)
717 *cp = '\0';
718
719 device_lock(dev);
720 old = pdev->driver_override;
721 if (strlen(driver_override)) {
722 pdev->driver_override = driver_override;
723 } else {
724 kfree(driver_override);
725 pdev->driver_override = NULL;
726 }
727 device_unlock(dev);
728
729 kfree(old);
730
731 return count;
732 }
733
734 static ssize_t driver_override_show(struct device *dev,
735 struct device_attribute *attr, char *buf)
736 {
737 struct pci_dev *pdev = to_pci_dev(dev);
738 ssize_t len;
739
740 device_lock(dev);
741 len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
742 device_unlock(dev);
743 return len;
744 }
745 static DEVICE_ATTR_RW(driver_override);
746
747 static struct attribute *pci_dev_attrs[] = {
748 &dev_attr_resource.attr,
749 &dev_attr_vendor.attr,
750 &dev_attr_device.attr,
751 &dev_attr_subsystem_vendor.attr,
752 &dev_attr_subsystem_device.attr,
753 &dev_attr_revision.attr,
754 &dev_attr_class.attr,
755 &dev_attr_irq.attr,
756 &dev_attr_local_cpus.attr,
757 &dev_attr_local_cpulist.attr,
758 &dev_attr_modalias.attr,
759 #ifdef CONFIG_NUMA
760 &dev_attr_numa_node.attr,
761 #endif
762 &dev_attr_dma_mask_bits.attr,
763 &dev_attr_consistent_dma_mask_bits.attr,
764 &dev_attr_enable.attr,
765 &dev_attr_broken_parity_status.attr,
766 &dev_attr_msi_bus.attr,
767 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
768 &dev_attr_d3cold_allowed.attr,
769 #endif
770 #ifdef CONFIG_OF
771 &dev_attr_devspec.attr,
772 #endif
773 &dev_attr_driver_override.attr,
774 &dev_attr_ari_enabled.attr,
775 NULL,
776 };
777
778 static struct attribute *pci_bridge_attrs[] = {
779 &dev_attr_subordinate_bus_number.attr,
780 &dev_attr_secondary_bus_number.attr,
781 NULL,
782 };
783
784 static struct attribute *pcie_dev_attrs[] = {
785 &dev_attr_current_link_speed.attr,
786 &dev_attr_current_link_width.attr,
787 &dev_attr_max_link_width.attr,
788 &dev_attr_max_link_speed.attr,
789 NULL,
790 };
791
792 static struct attribute *pcibus_attrs[] = {
793 &dev_attr_rescan.attr,
794 &dev_attr_cpuaffinity.attr,
795 &dev_attr_cpulistaffinity.attr,
796 NULL,
797 };
798
799 static const struct attribute_group pcibus_group = {
800 .attrs = pcibus_attrs,
801 };
802
803 const struct attribute_group *pcibus_groups[] = {
804 &pcibus_group,
805 NULL,
806 };
807
808 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
809 char *buf)
810 {
811 struct pci_dev *pdev = to_pci_dev(dev);
812 struct pci_dev *vga_dev = vga_default_device();
813
814 if (vga_dev)
815 return sprintf(buf, "%u\n", (pdev == vga_dev));
816
817 return sprintf(buf, "%u\n",
818 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
819 IORESOURCE_ROM_SHADOW));
820 }
821 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
822
823 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
824 struct bin_attribute *bin_attr, char *buf,
825 loff_t off, size_t count)
826 {
827 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
828 unsigned int size = 64;
829 loff_t init_off = off;
830 u8 *data = (u8 *) buf;
831
832 /* Several chips lock up trying to read undefined config space */
833 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
834 size = dev->cfg_size;
835 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
836 size = 128;
837
838 if (off > size)
839 return 0;
840 if (off + count > size) {
841 size -= off;
842 count = size;
843 } else {
844 size = count;
845 }
846
847 pci_config_pm_runtime_get(dev);
848
849 if ((off & 1) && size) {
850 u8 val;
851 pci_user_read_config_byte(dev, off, &val);
852 data[off - init_off] = val;
853 off++;
854 size--;
855 }
856
857 if ((off & 3) && size > 2) {
858 u16 val;
859 pci_user_read_config_word(dev, off, &val);
860 data[off - init_off] = val & 0xff;
861 data[off - init_off + 1] = (val >> 8) & 0xff;
862 off += 2;
863 size -= 2;
864 }
865
866 while (size > 3) {
867 u32 val;
868 pci_user_read_config_dword(dev, off, &val);
869 data[off - init_off] = val & 0xff;
870 data[off - init_off + 1] = (val >> 8) & 0xff;
871 data[off - init_off + 2] = (val >> 16) & 0xff;
872 data[off - init_off + 3] = (val >> 24) & 0xff;
873 off += 4;
874 size -= 4;
875 }
876
877 if (size >= 2) {
878 u16 val;
879 pci_user_read_config_word(dev, off, &val);
880 data[off - init_off] = val & 0xff;
881 data[off - init_off + 1] = (val >> 8) & 0xff;
882 off += 2;
883 size -= 2;
884 }
885
886 if (size > 0) {
887 u8 val;
888 pci_user_read_config_byte(dev, off, &val);
889 data[off - init_off] = val;
890 off++;
891 --size;
892 }
893
894 pci_config_pm_runtime_put(dev);
895
896 return count;
897 }
898
899 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
900 struct bin_attribute *bin_attr, char *buf,
901 loff_t off, size_t count)
902 {
903 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
904 unsigned int size = count;
905 loff_t init_off = off;
906 u8 *data = (u8 *) buf;
907
908 if (off > dev->cfg_size)
909 return 0;
910 if (off + count > dev->cfg_size) {
911 size = dev->cfg_size - off;
912 count = size;
913 }
914
915 pci_config_pm_runtime_get(dev);
916
917 if ((off & 1) && size) {
918 pci_user_write_config_byte(dev, off, data[off - init_off]);
919 off++;
920 size--;
921 }
922
923 if ((off & 3) && size > 2) {
924 u16 val = data[off - init_off];
925 val |= (u16) data[off - init_off + 1] << 8;
926 pci_user_write_config_word(dev, off, val);
927 off += 2;
928 size -= 2;
929 }
930
931 while (size > 3) {
932 u32 val = data[off - init_off];
933 val |= (u32) data[off - init_off + 1] << 8;
934 val |= (u32) data[off - init_off + 2] << 16;
935 val |= (u32) data[off - init_off + 3] << 24;
936 pci_user_write_config_dword(dev, off, val);
937 off += 4;
938 size -= 4;
939 }
940
941 if (size >= 2) {
942 u16 val = data[off - init_off];
943 val |= (u16) data[off - init_off + 1] << 8;
944 pci_user_write_config_word(dev, off, val);
945 off += 2;
946 size -= 2;
947 }
948
949 if (size) {
950 pci_user_write_config_byte(dev, off, data[off - init_off]);
951 off++;
952 --size;
953 }
954
955 pci_config_pm_runtime_put(dev);
956
957 return count;
958 }
959
960 #ifdef HAVE_PCI_LEGACY
961 /**
962 * pci_read_legacy_io - read byte(s) from legacy I/O port space
963 * @filp: open sysfs file
964 * @kobj: kobject corresponding to file to read from
965 * @bin_attr: struct bin_attribute for this file
966 * @buf: buffer to store results
967 * @off: offset into legacy I/O port space
968 * @count: number of bytes to read
969 *
970 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
971 * callback routine (pci_legacy_read).
972 */
973 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
974 struct bin_attribute *bin_attr, char *buf,
975 loff_t off, size_t count)
976 {
977 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
978
979 /* Only support 1, 2 or 4 byte accesses */
980 if (count != 1 && count != 2 && count != 4)
981 return -EINVAL;
982
983 return pci_legacy_read(bus, off, (u32 *)buf, count);
984 }
985
986 /**
987 * pci_write_legacy_io - write byte(s) to legacy I/O port space
988 * @filp: open sysfs file
989 * @kobj: kobject corresponding to file to read from
990 * @bin_attr: struct bin_attribute for this file
991 * @buf: buffer containing value to be written
992 * @off: offset into legacy I/O port space
993 * @count: number of bytes to write
994 *
995 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
996 * callback routine (pci_legacy_write).
997 */
998 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
999 struct bin_attribute *bin_attr, char *buf,
1000 loff_t off, size_t count)
1001 {
1002 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1003
1004 /* Only support 1, 2 or 4 byte accesses */
1005 if (count != 1 && count != 2 && count != 4)
1006 return -EINVAL;
1007
1008 return pci_legacy_write(bus, off, *(u32 *)buf, count);
1009 }
1010
1011 /**
1012 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
1013 * @filp: open sysfs file
1014 * @kobj: kobject corresponding to device to be mapped
1015 * @attr: struct bin_attribute for this file
1016 * @vma: struct vm_area_struct passed to mmap
1017 *
1018 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
1019 * legacy memory space (first meg of bus space) into application virtual
1020 * memory space.
1021 */
1022 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
1023 struct bin_attribute *attr,
1024 struct vm_area_struct *vma)
1025 {
1026 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1027
1028 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
1029 }
1030
1031 /**
1032 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
1033 * @filp: open sysfs file
1034 * @kobj: kobject corresponding to device to be mapped
1035 * @attr: struct bin_attribute for this file
1036 * @vma: struct vm_area_struct passed to mmap
1037 *
1038 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
1039 * legacy IO space (first meg of bus space) into application virtual
1040 * memory space. Returns -ENOSYS if the operation isn't supported
1041 */
1042 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
1043 struct bin_attribute *attr,
1044 struct vm_area_struct *vma)
1045 {
1046 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1047
1048 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
1049 }
1050
1051 /**
1052 * pci_adjust_legacy_attr - adjustment of legacy file attributes
1053 * @b: bus to create files under
1054 * @mmap_type: I/O port or memory
1055 *
1056 * Stub implementation. Can be overridden by arch if necessary.
1057 */
1058 void __weak pci_adjust_legacy_attr(struct pci_bus *b,
1059 enum pci_mmap_state mmap_type)
1060 {
1061 }
1062
1063 /**
1064 * pci_create_legacy_files - create legacy I/O port and memory files
1065 * @b: bus to create files under
1066 *
1067 * Some platforms allow access to legacy I/O port and ISA memory space on
1068 * a per-bus basis. This routine creates the files and ties them into
1069 * their associated read, write and mmap files from pci-sysfs.c
1070 *
1071 * On error unwind, but don't propagate the error to the caller
1072 * as it is ok to set up the PCI bus without these files.
1073 */
1074 void pci_create_legacy_files(struct pci_bus *b)
1075 {
1076 int error;
1077
1078 b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
1079 GFP_ATOMIC);
1080 if (!b->legacy_io)
1081 goto kzalloc_err;
1082
1083 sysfs_bin_attr_init(b->legacy_io);
1084 b->legacy_io->attr.name = "legacy_io";
1085 b->legacy_io->size = 0xffff;
1086 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
1087 b->legacy_io->read = pci_read_legacy_io;
1088 b->legacy_io->write = pci_write_legacy_io;
1089 b->legacy_io->mmap = pci_mmap_legacy_io;
1090 pci_adjust_legacy_attr(b, pci_mmap_io);
1091 error = device_create_bin_file(&b->dev, b->legacy_io);
1092 if (error)
1093 goto legacy_io_err;
1094
1095 /* Allocated above after the legacy_io struct */
1096 b->legacy_mem = b->legacy_io + 1;
1097 sysfs_bin_attr_init(b->legacy_mem);
1098 b->legacy_mem->attr.name = "legacy_mem";
1099 b->legacy_mem->size = 1024*1024;
1100 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
1101 b->legacy_mem->mmap = pci_mmap_legacy_mem;
1102 pci_adjust_legacy_attr(b, pci_mmap_mem);
1103 error = device_create_bin_file(&b->dev, b->legacy_mem);
1104 if (error)
1105 goto legacy_mem_err;
1106
1107 return;
1108
1109 legacy_mem_err:
1110 device_remove_bin_file(&b->dev, b->legacy_io);
1111 legacy_io_err:
1112 kfree(b->legacy_io);
1113 b->legacy_io = NULL;
1114 kzalloc_err:
1115 printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
1116 return;
1117 }
1118
1119 void pci_remove_legacy_files(struct pci_bus *b)
1120 {
1121 if (b->legacy_io) {
1122 device_remove_bin_file(&b->dev, b->legacy_io);
1123 device_remove_bin_file(&b->dev, b->legacy_mem);
1124 kfree(b->legacy_io); /* both are allocated here */
1125 }
1126 }
1127 #endif /* HAVE_PCI_LEGACY */
1128
1129 #if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
1130
1131 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
1132 enum pci_mmap_api mmap_api)
1133 {
1134 unsigned long nr, start, size;
1135 resource_size_t pci_start = 0, pci_end;
1136
1137 if (pci_resource_len(pdev, resno) == 0)
1138 return 0;
1139 nr = vma_pages(vma);
1140 start = vma->vm_pgoff;
1141 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
1142 if (mmap_api == PCI_MMAP_PROCFS) {
1143 pci_resource_to_user(pdev, resno, &pdev->resource[resno],
1144 &pci_start, &pci_end);
1145 pci_start >>= PAGE_SHIFT;
1146 }
1147 if (start >= pci_start && start < pci_start + size &&
1148 start + nr <= pci_start + size)
1149 return 1;
1150 return 0;
1151 }
1152
1153 /**
1154 * pci_mmap_resource - map a PCI resource into user memory space
1155 * @kobj: kobject for mapping
1156 * @attr: struct bin_attribute for the file being mapped
1157 * @vma: struct vm_area_struct passed into the mmap
1158 * @write_combine: 1 for write_combine mapping
1159 *
1160 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1161 */
1162 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1163 struct vm_area_struct *vma, int write_combine)
1164 {
1165 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1166 int bar = (unsigned long)attr->private;
1167 enum pci_mmap_state mmap_type;
1168 struct resource *res = &pdev->resource[bar];
1169
1170 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1171 return -EINVAL;
1172
1173 if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1174 return -EINVAL;
1175
1176 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1177
1178 return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1179 }
1180
1181 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1182 struct bin_attribute *attr,
1183 struct vm_area_struct *vma)
1184 {
1185 return pci_mmap_resource(kobj, attr, vma, 0);
1186 }
1187
1188 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1189 struct bin_attribute *attr,
1190 struct vm_area_struct *vma)
1191 {
1192 return pci_mmap_resource(kobj, attr, vma, 1);
1193 }
1194
1195 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1196 struct bin_attribute *attr, char *buf,
1197 loff_t off, size_t count, bool write)
1198 {
1199 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1200 int bar = (unsigned long)attr->private;
1201 unsigned long port = off;
1202
1203 port += pci_resource_start(pdev, bar);
1204
1205 if (port > pci_resource_end(pdev, bar))
1206 return 0;
1207
1208 if (port + count - 1 > pci_resource_end(pdev, bar))
1209 return -EINVAL;
1210
1211 switch (count) {
1212 case 1:
1213 if (write)
1214 outb(*(u8 *)buf, port);
1215 else
1216 *(u8 *)buf = inb(port);
1217 return 1;
1218 case 2:
1219 if (write)
1220 outw(*(u16 *)buf, port);
1221 else
1222 *(u16 *)buf = inw(port);
1223 return 2;
1224 case 4:
1225 if (write)
1226 outl(*(u32 *)buf, port);
1227 else
1228 *(u32 *)buf = inl(port);
1229 return 4;
1230 }
1231 return -EINVAL;
1232 }
1233
1234 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1235 struct bin_attribute *attr, char *buf,
1236 loff_t off, size_t count)
1237 {
1238 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1239 }
1240
1241 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1242 struct bin_attribute *attr, char *buf,
1243 loff_t off, size_t count)
1244 {
1245 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1246 }
1247
1248 /**
1249 * pci_remove_resource_files - cleanup resource files
1250 * @pdev: dev to cleanup
1251 *
1252 * If we created resource files for @pdev, remove them from sysfs and
1253 * free their resources.
1254 */
1255 static void pci_remove_resource_files(struct pci_dev *pdev)
1256 {
1257 int i;
1258
1259 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1260 struct bin_attribute *res_attr;
1261
1262 res_attr = pdev->res_attr[i];
1263 if (res_attr) {
1264 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1265 kfree(res_attr);
1266 }
1267
1268 res_attr = pdev->res_attr_wc[i];
1269 if (res_attr) {
1270 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1271 kfree(res_attr);
1272 }
1273 }
1274 }
1275
1276 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1277 {
1278 /* allocate attribute structure, piggyback attribute name */
1279 int name_len = write_combine ? 13 : 10;
1280 struct bin_attribute *res_attr;
1281 char *res_attr_name;
1282 int retval;
1283
1284 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1285 if (!res_attr)
1286 return -ENOMEM;
1287
1288 res_attr_name = (char *)(res_attr + 1);
1289
1290 sysfs_bin_attr_init(res_attr);
1291 if (write_combine) {
1292 pdev->res_attr_wc[num] = res_attr;
1293 sprintf(res_attr_name, "resource%d_wc", num);
1294 res_attr->mmap = pci_mmap_resource_wc;
1295 } else {
1296 pdev->res_attr[num] = res_attr;
1297 sprintf(res_attr_name, "resource%d", num);
1298 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1299 res_attr->read = pci_read_resource_io;
1300 res_attr->write = pci_write_resource_io;
1301 if (arch_can_pci_mmap_io())
1302 res_attr->mmap = pci_mmap_resource_uc;
1303 } else {
1304 res_attr->mmap = pci_mmap_resource_uc;
1305 }
1306 }
1307 res_attr->attr.name = res_attr_name;
1308 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1309 res_attr->size = pci_resource_len(pdev, num);
1310 res_attr->private = (void *)(unsigned long)num;
1311 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1312 if (retval)
1313 kfree(res_attr);
1314
1315 return retval;
1316 }
1317
1318 /**
1319 * pci_create_resource_files - create resource files in sysfs for @dev
1320 * @pdev: dev in question
1321 *
1322 * Walk the resources in @pdev creating files for each resource available.
1323 */
1324 static int pci_create_resource_files(struct pci_dev *pdev)
1325 {
1326 int i;
1327 int retval;
1328
1329 /* Expose the PCI resources from this device as files */
1330 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1331
1332 /* skip empty resources */
1333 if (!pci_resource_len(pdev, i))
1334 continue;
1335
1336 retval = pci_create_attr(pdev, i, 0);
1337 /* for prefetchable resources, create a WC mappable file */
1338 if (!retval && arch_can_pci_mmap_wc() &&
1339 pdev->resource[i].flags & IORESOURCE_PREFETCH)
1340 retval = pci_create_attr(pdev, i, 1);
1341 if (retval) {
1342 pci_remove_resource_files(pdev);
1343 return retval;
1344 }
1345 }
1346 return 0;
1347 }
1348 #else /* !HAVE_PCI_MMAP */
1349 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1350 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1351 #endif /* HAVE_PCI_MMAP */
1352
1353 /**
1354 * pci_write_rom - used to enable access to the PCI ROM display
1355 * @filp: sysfs file
1356 * @kobj: kernel object handle
1357 * @bin_attr: struct bin_attribute for this file
1358 * @buf: user input
1359 * @off: file offset
1360 * @count: number of byte in input
1361 *
1362 * writing anything except 0 enables it
1363 */
1364 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1365 struct bin_attribute *bin_attr, char *buf,
1366 loff_t off, size_t count)
1367 {
1368 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1369
1370 if ((off == 0) && (*buf == '0') && (count == 2))
1371 pdev->rom_attr_enabled = 0;
1372 else
1373 pdev->rom_attr_enabled = 1;
1374
1375 return count;
1376 }
1377
1378 /**
1379 * pci_read_rom - read a PCI ROM
1380 * @filp: sysfs file
1381 * @kobj: kernel object handle
1382 * @bin_attr: struct bin_attribute for this file
1383 * @buf: where to put the data we read from the ROM
1384 * @off: file offset
1385 * @count: number of bytes to read
1386 *
1387 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1388 * device corresponding to @kobj.
1389 */
1390 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1391 struct bin_attribute *bin_attr, char *buf,
1392 loff_t off, size_t count)
1393 {
1394 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1395 void __iomem *rom;
1396 size_t size;
1397
1398 if (!pdev->rom_attr_enabled)
1399 return -EINVAL;
1400
1401 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1402 if (!rom || !size)
1403 return -EIO;
1404
1405 if (off >= size)
1406 count = 0;
1407 else {
1408 if (off + count > size)
1409 count = size - off;
1410
1411 memcpy_fromio(buf, rom + off, count);
1412 }
1413 pci_unmap_rom(pdev, rom);
1414
1415 return count;
1416 }
1417
1418 static const struct bin_attribute pci_config_attr = {
1419 .attr = {
1420 .name = "config",
1421 .mode = S_IRUGO | S_IWUSR,
1422 },
1423 .size = PCI_CFG_SPACE_SIZE,
1424 .read = pci_read_config,
1425 .write = pci_write_config,
1426 };
1427
1428 static const struct bin_attribute pcie_config_attr = {
1429 .attr = {
1430 .name = "config",
1431 .mode = S_IRUGO | S_IWUSR,
1432 },
1433 .size = PCI_CFG_SPACE_EXP_SIZE,
1434 .read = pci_read_config,
1435 .write = pci_write_config,
1436 };
1437
1438 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1439 const char *buf, size_t count)
1440 {
1441 struct pci_dev *pdev = to_pci_dev(dev);
1442 unsigned long val;
1443 ssize_t result = kstrtoul(buf, 0, &val);
1444
1445 if (result < 0)
1446 return result;
1447
1448 if (val != 1)
1449 return -EINVAL;
1450
1451 pm_runtime_get_sync(dev);
1452 result = pci_reset_function(pdev);
1453 pm_runtime_put(dev);
1454 if (result < 0)
1455 return result;
1456
1457 return count;
1458 }
1459
1460 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1461
1462 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1463 {
1464 int retval;
1465
1466 pcie_vpd_create_sysfs_dev_files(dev);
1467 pcie_aspm_create_sysfs_dev_files(dev);
1468
1469 if (dev->reset_fn) {
1470 retval = device_create_file(&dev->dev, &reset_attr);
1471 if (retval)
1472 goto error;
1473 }
1474 return 0;
1475
1476 error:
1477 pcie_aspm_remove_sysfs_dev_files(dev);
1478 pcie_vpd_remove_sysfs_dev_files(dev);
1479 return retval;
1480 }
1481
1482 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1483 {
1484 int retval;
1485 int rom_size;
1486 struct bin_attribute *attr;
1487
1488 if (!sysfs_initialized)
1489 return -EACCES;
1490
1491 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1492 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1493 else
1494 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1495 if (retval)
1496 goto err;
1497
1498 retval = pci_create_resource_files(pdev);
1499 if (retval)
1500 goto err_config_file;
1501
1502 /* If the device has a ROM, try to expose it in sysfs. */
1503 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1504 if (rom_size) {
1505 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1506 if (!attr) {
1507 retval = -ENOMEM;
1508 goto err_resource_files;
1509 }
1510 sysfs_bin_attr_init(attr);
1511 attr->size = rom_size;
1512 attr->attr.name = "rom";
1513 attr->attr.mode = S_IRUSR | S_IWUSR;
1514 attr->read = pci_read_rom;
1515 attr->write = pci_write_rom;
1516 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1517 if (retval) {
1518 kfree(attr);
1519 goto err_resource_files;
1520 }
1521 pdev->rom_attr = attr;
1522 }
1523
1524 /* add sysfs entries for various capabilities */
1525 retval = pci_create_capabilities_sysfs(pdev);
1526 if (retval)
1527 goto err_rom_file;
1528
1529 pci_create_firmware_label_files(pdev);
1530
1531 return 0;
1532
1533 err_rom_file:
1534 if (pdev->rom_attr) {
1535 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1536 kfree(pdev->rom_attr);
1537 pdev->rom_attr = NULL;
1538 }
1539 err_resource_files:
1540 pci_remove_resource_files(pdev);
1541 err_config_file:
1542 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1543 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1544 else
1545 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1546 err:
1547 return retval;
1548 }
1549
1550 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1551 {
1552 pcie_vpd_remove_sysfs_dev_files(dev);
1553 pcie_aspm_remove_sysfs_dev_files(dev);
1554 if (dev->reset_fn) {
1555 device_remove_file(&dev->dev, &reset_attr);
1556 dev->reset_fn = 0;
1557 }
1558 }
1559
1560 /**
1561 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1562 * @pdev: device whose entries we should free
1563 *
1564 * Cleanup when @pdev is removed from sysfs.
1565 */
1566 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1567 {
1568 if (!sysfs_initialized)
1569 return;
1570
1571 pci_remove_capabilities_sysfs(pdev);
1572
1573 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1574 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1575 else
1576 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1577
1578 pci_remove_resource_files(pdev);
1579
1580 if (pdev->rom_attr) {
1581 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1582 kfree(pdev->rom_attr);
1583 pdev->rom_attr = NULL;
1584 }
1585
1586 pci_remove_firmware_label_files(pdev);
1587 }
1588
1589 static int __init pci_sysfs_init(void)
1590 {
1591 struct pci_dev *pdev = NULL;
1592 int retval;
1593
1594 sysfs_initialized = 1;
1595 for_each_pci_dev(pdev) {
1596 retval = pci_create_sysfs_dev_files(pdev);
1597 if (retval) {
1598 pci_dev_put(pdev);
1599 return retval;
1600 }
1601 }
1602
1603 return 0;
1604 }
1605 late_initcall(pci_sysfs_init);
1606
1607 static struct attribute *pci_dev_dev_attrs[] = {
1608 &vga_attr.attr,
1609 NULL,
1610 };
1611
1612 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1613 struct attribute *a, int n)
1614 {
1615 struct device *dev = kobj_to_dev(kobj);
1616 struct pci_dev *pdev = to_pci_dev(dev);
1617
1618 if (a == &vga_attr.attr)
1619 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1620 return 0;
1621
1622 return a->mode;
1623 }
1624
1625 static struct attribute *pci_dev_hp_attrs[] = {
1626 &dev_remove_attr.attr,
1627 &dev_rescan_attr.attr,
1628 NULL,
1629 };
1630
1631 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1632 struct attribute *a, int n)
1633 {
1634 struct device *dev = kobj_to_dev(kobj);
1635 struct pci_dev *pdev = to_pci_dev(dev);
1636
1637 if (pdev->is_virtfn)
1638 return 0;
1639
1640 return a->mode;
1641 }
1642
1643 static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1644 struct attribute *a, int n)
1645 {
1646 struct device *dev = kobj_to_dev(kobj);
1647 struct pci_dev *pdev = to_pci_dev(dev);
1648
1649 if (pci_is_bridge(pdev))
1650 return a->mode;
1651
1652 return 0;
1653 }
1654
1655 static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1656 struct attribute *a, int n)
1657 {
1658 struct device *dev = kobj_to_dev(kobj);
1659 struct pci_dev *pdev = to_pci_dev(dev);
1660
1661 if (pci_is_pcie(pdev))
1662 return a->mode;
1663
1664 return 0;
1665 }
1666
1667 static const struct attribute_group pci_dev_group = {
1668 .attrs = pci_dev_attrs,
1669 };
1670
1671 const struct attribute_group *pci_dev_groups[] = {
1672 &pci_dev_group,
1673 NULL,
1674 };
1675
1676 static const struct attribute_group pci_bridge_group = {
1677 .attrs = pci_bridge_attrs,
1678 };
1679
1680 const struct attribute_group *pci_bridge_groups[] = {
1681 &pci_bridge_group,
1682 NULL,
1683 };
1684
1685 static const struct attribute_group pcie_dev_group = {
1686 .attrs = pcie_dev_attrs,
1687 };
1688
1689 const struct attribute_group *pcie_dev_groups[] = {
1690 &pcie_dev_group,
1691 NULL,
1692 };
1693
1694 static const struct attribute_group pci_dev_hp_attr_group = {
1695 .attrs = pci_dev_hp_attrs,
1696 .is_visible = pci_dev_hp_attrs_are_visible,
1697 };
1698
1699 #ifdef CONFIG_PCI_IOV
1700 static struct attribute *sriov_dev_attrs[] = {
1701 &sriov_totalvfs_attr.attr,
1702 &sriov_numvfs_attr.attr,
1703 &sriov_offset_attr.attr,
1704 &sriov_stride_attr.attr,
1705 &sriov_vf_device_attr.attr,
1706 &sriov_drivers_autoprobe_attr.attr,
1707 NULL,
1708 };
1709
1710 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1711 struct attribute *a, int n)
1712 {
1713 struct device *dev = kobj_to_dev(kobj);
1714
1715 if (!dev_is_pf(dev))
1716 return 0;
1717
1718 return a->mode;
1719 }
1720
1721 static const struct attribute_group sriov_dev_attr_group = {
1722 .attrs = sriov_dev_attrs,
1723 .is_visible = sriov_attrs_are_visible,
1724 };
1725 #endif /* CONFIG_PCI_IOV */
1726
1727 static const struct attribute_group pci_dev_attr_group = {
1728 .attrs = pci_dev_dev_attrs,
1729 .is_visible = pci_dev_attrs_are_visible,
1730 };
1731
1732 static const struct attribute_group pci_bridge_attr_group = {
1733 .attrs = pci_bridge_attrs,
1734 .is_visible = pci_bridge_attrs_are_visible,
1735 };
1736
1737 static const struct attribute_group pcie_dev_attr_group = {
1738 .attrs = pcie_dev_attrs,
1739 .is_visible = pcie_dev_attrs_are_visible,
1740 };
1741
1742 static const struct attribute_group *pci_dev_attr_groups[] = {
1743 &pci_dev_attr_group,
1744 &pci_dev_hp_attr_group,
1745 #ifdef CONFIG_PCI_IOV
1746 &sriov_dev_attr_group,
1747 #endif
1748 &pci_bridge_attr_group,
1749 &pcie_dev_attr_group,
1750 #ifdef CONFIG_PCIEAER
1751 &aer_stats_attr_group,
1752 #endif
1753 NULL,
1754 };
1755
1756 const struct device_type pci_dev_type = {
1757 .groups = pci_dev_attr_groups,
1758 };
Linux with added FPC-III support