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treewide: kzalloc() -> kcalloc()
[linux-2.6/btrfs-unstable.git] / drivers / pci / pci-sysfs.c
blob0c4653c1d2cec6f743a0bd650ead5c029ef299bc
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/pci-aspm.h>
27 #include <linux/slab.h>
28 #include <linux/vgaarb.h>
29 #include <linux/pm_runtime.h>
30 #include <linux/of.h>
31 #include "pci.h"
32
33 static int sysfs_initialized; /* = 0 */
34
35 /* show configuration fields */
36 #define pci_config_attr(field, format_string) \
37 static ssize_t \
38 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
39 { \
40 struct pci_dev *pdev; \
41 \
42 pdev = to_pci_dev(dev); \
43 return sprintf(buf, format_string, pdev->field); \
44 } \
45 static DEVICE_ATTR_RO(field)
46
47 pci_config_attr(vendor, "0x%04x\n");
48 pci_config_attr(device, "0x%04x\n");
49 pci_config_attr(subsystem_vendor, "0x%04x\n");
50 pci_config_attr(subsystem_device, "0x%04x\n");
51 pci_config_attr(revision, "0x%02x\n");
52 pci_config_attr(class, "0x%06x\n");
53 pci_config_attr(irq, "%u\n");
54
55 static ssize_t broken_parity_status_show(struct device *dev,
56 struct device_attribute *attr,
57 char *buf)
58 {
59 struct pci_dev *pdev = to_pci_dev(dev);
60 return sprintf(buf, "%u\n", pdev->broken_parity_status);
61 }
62
63 static ssize_t broken_parity_status_store(struct device *dev,
64 struct device_attribute *attr,
65 const char *buf, size_t count)
66 {
67 struct pci_dev *pdev = to_pci_dev(dev);
68 unsigned long val;
69
70 if (kstrtoul(buf, 0, &val) < 0)
71 return -EINVAL;
72
73 pdev->broken_parity_status = !!val;
74
75 return count;
76 }
77 static DEVICE_ATTR_RW(broken_parity_status);
78
79 static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
80 struct device_attribute *attr, char *buf)
81 {
82 const struct cpumask *mask;
83
84 #ifdef CONFIG_NUMA
85 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
86 cpumask_of_node(dev_to_node(dev));
87 #else
88 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
89 #endif
90 return cpumap_print_to_pagebuf(list, buf, mask);
91 }
92
93 static ssize_t local_cpus_show(struct device *dev,
94 struct device_attribute *attr, char *buf)
95 {
96 return pci_dev_show_local_cpu(dev, false, attr, buf);
97 }
98 static DEVICE_ATTR_RO(local_cpus);
99
100 static ssize_t local_cpulist_show(struct device *dev,
101 struct device_attribute *attr, char *buf)
102 {
103 return pci_dev_show_local_cpu(dev, true, attr, buf);
104 }
105 static DEVICE_ATTR_RO(local_cpulist);
106
107 /*
108 * PCI Bus Class Devices
109 */
110 static ssize_t cpuaffinity_show(struct device *dev,
111 struct device_attribute *attr, char *buf)
112 {
113 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
114
115 return cpumap_print_to_pagebuf(false, buf, cpumask);
116 }
117 static DEVICE_ATTR_RO(cpuaffinity);
118
119 static ssize_t cpulistaffinity_show(struct device *dev,
120 struct device_attribute *attr, char *buf)
121 {
122 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
123
124 return cpumap_print_to_pagebuf(true, buf, cpumask);
125 }
126 static DEVICE_ATTR_RO(cpulistaffinity);
127
128 /* show resources */
129 static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
130 char *buf)
131 {
132 struct pci_dev *pci_dev = to_pci_dev(dev);
133 char *str = buf;
134 int i;
135 int max;
136 resource_size_t start, end;
137
138 if (pci_dev->subordinate)
139 max = DEVICE_COUNT_RESOURCE;
140 else
141 max = PCI_BRIDGE_RESOURCES;
142
143 for (i = 0; i < max; i++) {
144 struct resource *res = &pci_dev->resource[i];
145 pci_resource_to_user(pci_dev, i, res, &start, &end);
146 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
147 (unsigned long long)start,
148 (unsigned long long)end,
149 (unsigned long long)res->flags);
150 }
151 return (str - buf);
152 }
153 static DEVICE_ATTR_RO(resource);
154
155 static ssize_t max_link_speed_show(struct device *dev,
156 struct device_attribute *attr, char *buf)
157 {
158 struct pci_dev *pdev = to_pci_dev(dev);
159
160 return sprintf(buf, "%s\n", PCIE_SPEED2STR(pcie_get_speed_cap(pdev)));
161 }
162 static DEVICE_ATTR_RO(max_link_speed);
163
164 static ssize_t max_link_width_show(struct device *dev,
165 struct device_attribute *attr, char *buf)
166 {
167 struct pci_dev *pdev = to_pci_dev(dev);
168
169 return sprintf(buf, "%u\n", pcie_get_width_cap(pdev));
170 }
171 static DEVICE_ATTR_RO(max_link_width);
172
173 static ssize_t current_link_speed_show(struct device *dev,
174 struct device_attribute *attr, char *buf)
175 {
176 struct pci_dev *pci_dev = to_pci_dev(dev);
177 u16 linkstat;
178 int err;
179 const char *speed;
180
181 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
182 if (err)
183 return -EINVAL;
184
185 switch (linkstat & PCI_EXP_LNKSTA_CLS) {
186 case PCI_EXP_LNKSTA_CLS_16_0GB:
187 speed = "16 GT/s";
188 break;
189 case PCI_EXP_LNKSTA_CLS_8_0GB:
190 speed = "8 GT/s";
191 break;
192 case PCI_EXP_LNKSTA_CLS_5_0GB:
193 speed = "5 GT/s";
194 break;
195 case PCI_EXP_LNKSTA_CLS_2_5GB:
196 speed = "2.5 GT/s";
197 break;
198 default:
199 speed = "Unknown speed";
200 }
201
202 return sprintf(buf, "%s\n", speed);
203 }
204 static DEVICE_ATTR_RO(current_link_speed);
205
206 static ssize_t current_link_width_show(struct device *dev,
207 struct device_attribute *attr, char *buf)
208 {
209 struct pci_dev *pci_dev = to_pci_dev(dev);
210 u16 linkstat;
211 int err;
212
213 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
214 if (err)
215 return -EINVAL;
216
217 return sprintf(buf, "%u\n",
218 (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
219 }
220 static DEVICE_ATTR_RO(current_link_width);
221
222 static ssize_t secondary_bus_number_show(struct device *dev,
223 struct device_attribute *attr,
224 char *buf)
225 {
226 struct pci_dev *pci_dev = to_pci_dev(dev);
227 u8 sec_bus;
228 int err;
229
230 err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
231 if (err)
232 return -EINVAL;
233
234 return sprintf(buf, "%u\n", sec_bus);
235 }
236 static DEVICE_ATTR_RO(secondary_bus_number);
237
238 static ssize_t subordinate_bus_number_show(struct device *dev,
239 struct device_attribute *attr,
240 char *buf)
241 {
242 struct pci_dev *pci_dev = to_pci_dev(dev);
243 u8 sub_bus;
244 int err;
245
246 err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
247 if (err)
248 return -EINVAL;
249
250 return sprintf(buf, "%u\n", sub_bus);
251 }
252 static DEVICE_ATTR_RO(subordinate_bus_number);
253
254 static ssize_t ari_enabled_show(struct device *dev,
255 struct device_attribute *attr,
256 char *buf)
257 {
258 struct pci_dev *pci_dev = to_pci_dev(dev);
259
260 return sprintf(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
261 }
262 static DEVICE_ATTR_RO(ari_enabled);
263
264 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
265 char *buf)
266 {
267 struct pci_dev *pci_dev = to_pci_dev(dev);
268
269 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
270 pci_dev->vendor, pci_dev->device,
271 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
272 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
273 (u8)(pci_dev->class));
274 }
275 static DEVICE_ATTR_RO(modalias);
276
277 static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
278 const char *buf, size_t count)
279 {
280 struct pci_dev *pdev = to_pci_dev(dev);
281 unsigned long val;
282 ssize_t result = kstrtoul(buf, 0, &val);
283
284 if (result < 0)
285 return result;
286
287 /* this can crash the machine when done on the "wrong" device */
288 if (!capable(CAP_SYS_ADMIN))
289 return -EPERM;
290
291 device_lock(dev);
292 if (dev->driver)
293 result = -EBUSY;
294 else if (val)
295 result = pci_enable_device(pdev);
296 else if (pci_is_enabled(pdev))
297 pci_disable_device(pdev);
298 else
299 result = -EIO;
300 device_unlock(dev);
301
302 return result < 0 ? result : count;
303 }
304
305 static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
306 char *buf)
307 {
308 struct pci_dev *pdev;
309
310 pdev = to_pci_dev(dev);
311 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
312 }
313 static DEVICE_ATTR_RW(enable);
314
315 #ifdef CONFIG_NUMA
316 static ssize_t numa_node_store(struct device *dev,
317 struct device_attribute *attr, const char *buf,
318 size_t count)
319 {
320 struct pci_dev *pdev = to_pci_dev(dev);
321 int node, ret;
322
323 if (!capable(CAP_SYS_ADMIN))
324 return -EPERM;
325
326 ret = kstrtoint(buf, 0, &node);
327 if (ret)
328 return ret;
329
330 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
331 return -EINVAL;
332
333 if (node != NUMA_NO_NODE && !node_online(node))
334 return -EINVAL;
335
336 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
337 pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
338 node);
339
340 dev->numa_node = node;
341 return count;
342 }
343
344 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
345 char *buf)
346 {
347 return sprintf(buf, "%d\n", dev->numa_node);
348 }
349 static DEVICE_ATTR_RW(numa_node);
350 #endif
351
352 static ssize_t dma_mask_bits_show(struct device *dev,
353 struct device_attribute *attr, char *buf)
354 {
355 struct pci_dev *pdev = to_pci_dev(dev);
356
357 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
358 }
359 static DEVICE_ATTR_RO(dma_mask_bits);
360
361 static ssize_t consistent_dma_mask_bits_show(struct device *dev,
362 struct device_attribute *attr,
363 char *buf)
364 {
365 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
366 }
367 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
368
369 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
370 char *buf)
371 {
372 struct pci_dev *pdev = to_pci_dev(dev);
373 struct pci_bus *subordinate = pdev->subordinate;
374
375 return sprintf(buf, "%u\n", subordinate ?
376 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
377 : !pdev->no_msi);
378 }
379
380 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
381 const char *buf, size_t count)
382 {
383 struct pci_dev *pdev = to_pci_dev(dev);
384 struct pci_bus *subordinate = pdev->subordinate;
385 unsigned long val;
386
387 if (kstrtoul(buf, 0, &val) < 0)
388 return -EINVAL;
389
390 if (!capable(CAP_SYS_ADMIN))
391 return -EPERM;
392
393 /*
394 * "no_msi" and "bus_flags" only affect what happens when a driver
395 * requests MSI or MSI-X. They don't affect any drivers that have
396 * already requested MSI or MSI-X.
397 */
398 if (!subordinate) {
399 pdev->no_msi = !val;
400 pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
401 val ? "allowed" : "disallowed");
402 return count;
403 }
404
405 if (val)
406 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
407 else
408 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
409
410 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
411 val ? "allowed" : "disallowed");
412 return count;
413 }
414 static DEVICE_ATTR_RW(msi_bus);
415
416 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
417 size_t count)
418 {
419 unsigned long val;
420 struct pci_bus *b = NULL;
421
422 if (kstrtoul(buf, 0, &val) < 0)
423 return -EINVAL;
424
425 if (val) {
426 pci_lock_rescan_remove();
427 while ((b = pci_find_next_bus(b)) != NULL)
428 pci_rescan_bus(b);
429 pci_unlock_rescan_remove();
430 }
431 return count;
432 }
433 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
434
435 static struct attribute *pci_bus_attrs[] = {
436 &bus_attr_rescan.attr,
437 NULL,
438 };
439
440 static const struct attribute_group pci_bus_group = {
441 .attrs = pci_bus_attrs,
442 };
443
444 const struct attribute_group *pci_bus_groups[] = {
445 &pci_bus_group,
446 NULL,
447 };
448
449 static ssize_t dev_rescan_store(struct device *dev,
450 struct device_attribute *attr, const char *buf,
451 size_t count)
452 {
453 unsigned long val;
454 struct pci_dev *pdev = to_pci_dev(dev);
455
456 if (kstrtoul(buf, 0, &val) < 0)
457 return -EINVAL;
458
459 if (val) {
460 pci_lock_rescan_remove();
461 pci_rescan_bus(pdev->bus);
462 pci_unlock_rescan_remove();
463 }
464 return count;
465 }
466 static struct device_attribute dev_rescan_attr = __ATTR(rescan,
467 (S_IWUSR|S_IWGRP),
468 NULL, dev_rescan_store);
469
470 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
471 const char *buf, size_t count)
472 {
473 unsigned long val;
474
475 if (kstrtoul(buf, 0, &val) < 0)
476 return -EINVAL;
477
478 if (val && device_remove_file_self(dev, attr))
479 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
480 return count;
481 }
482 static struct device_attribute dev_remove_attr = __ATTR(remove,
483 (S_IWUSR|S_IWGRP),
484 NULL, remove_store);
485
486 static ssize_t dev_bus_rescan_store(struct device *dev,
487 struct device_attribute *attr,
488 const char *buf, size_t count)
489 {
490 unsigned long val;
491 struct pci_bus *bus = to_pci_bus(dev);
492
493 if (kstrtoul(buf, 0, &val) < 0)
494 return -EINVAL;
495
496 if (val) {
497 pci_lock_rescan_remove();
498 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
499 pci_rescan_bus_bridge_resize(bus->self);
500 else
501 pci_rescan_bus(bus);
502 pci_unlock_rescan_remove();
503 }
504 return count;
505 }
506 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
507
508 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
509 static ssize_t d3cold_allowed_store(struct device *dev,
510 struct device_attribute *attr,
511 const char *buf, size_t count)
512 {
513 struct pci_dev *pdev = to_pci_dev(dev);
514 unsigned long val;
515
516 if (kstrtoul(buf, 0, &val) < 0)
517 return -EINVAL;
518
519 pdev->d3cold_allowed = !!val;
520 if (pdev->d3cold_allowed)
521 pci_d3cold_enable(pdev);
522 else
523 pci_d3cold_disable(pdev);
524
525 pm_runtime_resume(dev);
526
527 return count;
528 }
529
530 static ssize_t d3cold_allowed_show(struct device *dev,
531 struct device_attribute *attr, char *buf)
532 {
533 struct pci_dev *pdev = to_pci_dev(dev);
534 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
535 }
536 static DEVICE_ATTR_RW(d3cold_allowed);
537 #endif
538
539 #ifdef CONFIG_OF
540 static ssize_t devspec_show(struct device *dev,
541 struct device_attribute *attr, char *buf)
542 {
543 struct pci_dev *pdev = to_pci_dev(dev);
544 struct device_node *np = pci_device_to_OF_node(pdev);
545
546 if (np == NULL)
547 return 0;
548 return sprintf(buf, "%pOF", np);
549 }
550 static DEVICE_ATTR_RO(devspec);
551 #endif
552
553 #ifdef CONFIG_PCI_IOV
554 static ssize_t sriov_totalvfs_show(struct device *dev,
555 struct device_attribute *attr,
556 char *buf)
557 {
558 struct pci_dev *pdev = to_pci_dev(dev);
559
560 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
561 }
562
563
564 static ssize_t sriov_numvfs_show(struct device *dev,
565 struct device_attribute *attr,
566 char *buf)
567 {
568 struct pci_dev *pdev = to_pci_dev(dev);
569
570 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
571 }
572
573 /*
574 * num_vfs > 0; number of VFs to enable
575 * num_vfs = 0; disable all VFs
576 *
577 * Note: SRIOV spec doesn't allow partial VF
578 * disable, so it's all or none.
579 */
580 static ssize_t sriov_numvfs_store(struct device *dev,
581 struct device_attribute *attr,
582 const char *buf, size_t count)
583 {
584 struct pci_dev *pdev = to_pci_dev(dev);
585 int ret;
586 u16 num_vfs;
587
588 ret = kstrtou16(buf, 0, &num_vfs);
589 if (ret < 0)
590 return ret;
591
592 if (num_vfs > pci_sriov_get_totalvfs(pdev))
593 return -ERANGE;
594
595 device_lock(&pdev->dev);
596
597 if (num_vfs == pdev->sriov->num_VFs)
598 goto exit;
599
600 /* is PF driver loaded w/callback */
601 if (!pdev->driver || !pdev->driver->sriov_configure) {
602 pci_info(pdev, "Driver doesn't support SRIOV configuration via sysfs\n");
603 ret = -ENOENT;
604 goto exit;
605 }
606
607 if (num_vfs == 0) {
608 /* disable VFs */
609 ret = pdev->driver->sriov_configure(pdev, 0);
610 goto exit;
611 }
612
613 /* enable VFs */
614 if (pdev->sriov->num_VFs) {
615 pci_warn(pdev, "%d VFs already enabled. Disable before enabling %d VFs\n",
616 pdev->sriov->num_VFs, num_vfs);
617 ret = -EBUSY;
618 goto exit;
619 }
620
621 ret = pdev->driver->sriov_configure(pdev, num_vfs);
622 if (ret < 0)
623 goto exit;
624
625 if (ret != num_vfs)
626 pci_warn(pdev, "%d VFs requested; only %d enabled\n",
627 num_vfs, ret);
628
629 exit:
630 device_unlock(&pdev->dev);
631
632 if (ret < 0)
633 return ret;
634
635 return count;
636 }
637
638 static ssize_t sriov_offset_show(struct device *dev,
639 struct device_attribute *attr,
640 char *buf)
641 {
642 struct pci_dev *pdev = to_pci_dev(dev);
643
644 return sprintf(buf, "%u\n", pdev->sriov->offset);
645 }
646
647 static ssize_t sriov_stride_show(struct device *dev,
648 struct device_attribute *attr,
649 char *buf)
650 {
651 struct pci_dev *pdev = to_pci_dev(dev);
652
653 return sprintf(buf, "%u\n", pdev->sriov->stride);
654 }
655
656 static ssize_t sriov_vf_device_show(struct device *dev,
657 struct device_attribute *attr,
658 char *buf)
659 {
660 struct pci_dev *pdev = to_pci_dev(dev);
661
662 return sprintf(buf, "%x\n", pdev->sriov->vf_device);
663 }
664
665 static ssize_t sriov_drivers_autoprobe_show(struct device *dev,
666 struct device_attribute *attr,
667 char *buf)
668 {
669 struct pci_dev *pdev = to_pci_dev(dev);
670
671 return sprintf(buf, "%u\n", pdev->sriov->drivers_autoprobe);
672 }
673
674 static ssize_t sriov_drivers_autoprobe_store(struct device *dev,
675 struct device_attribute *attr,
676 const char *buf, size_t count)
677 {
678 struct pci_dev *pdev = to_pci_dev(dev);
679 bool drivers_autoprobe;
680
681 if (kstrtobool(buf, &drivers_autoprobe) < 0)
682 return -EINVAL;
683
684 pdev->sriov->drivers_autoprobe = drivers_autoprobe;
685
686 return count;
687 }
688
689 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
690 static struct device_attribute sriov_numvfs_attr =
691 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
692 sriov_numvfs_show, sriov_numvfs_store);
693 static struct device_attribute sriov_offset_attr = __ATTR_RO(sriov_offset);
694 static struct device_attribute sriov_stride_attr = __ATTR_RO(sriov_stride);
695 static struct device_attribute sriov_vf_device_attr = __ATTR_RO(sriov_vf_device);
696 static struct device_attribute sriov_drivers_autoprobe_attr =
697 __ATTR(sriov_drivers_autoprobe, (S_IRUGO|S_IWUSR|S_IWGRP),
698 sriov_drivers_autoprobe_show, sriov_drivers_autoprobe_store);
699 #endif /* CONFIG_PCI_IOV */
700
701 static ssize_t driver_override_store(struct device *dev,
702 struct device_attribute *attr,
703 const char *buf, size_t count)
704 {
705 struct pci_dev *pdev = to_pci_dev(dev);
706 char *driver_override, *old, *cp;
707
708 /* We need to keep extra room for a newline */
709 if (count >= (PAGE_SIZE - 1))
710 return -EINVAL;
711
712 driver_override = kstrndup(buf, count, GFP_KERNEL);
713 if (!driver_override)
714 return -ENOMEM;
715
716 cp = strchr(driver_override, '\n');
717 if (cp)
718 *cp = '\0';
719
720 device_lock(dev);
721 old = pdev->driver_override;
722 if (strlen(driver_override)) {
723 pdev->driver_override = driver_override;
724 } else {
725 kfree(driver_override);
726 pdev->driver_override = NULL;
727 }
728 device_unlock(dev);
729
730 kfree(old);
731
732 return count;
733 }
734
735 static ssize_t driver_override_show(struct device *dev,
736 struct device_attribute *attr, char *buf)
737 {
738 struct pci_dev *pdev = to_pci_dev(dev);
739 ssize_t len;
740
741 device_lock(dev);
742 len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
743 device_unlock(dev);
744 return len;
745 }
746 static DEVICE_ATTR_RW(driver_override);
747
748 static struct attribute *pci_dev_attrs[] = {
749 &dev_attr_resource.attr,
750 &dev_attr_vendor.attr,
751 &dev_attr_device.attr,
752 &dev_attr_subsystem_vendor.attr,
753 &dev_attr_subsystem_device.attr,
754 &dev_attr_revision.attr,
755 &dev_attr_class.attr,
756 &dev_attr_irq.attr,
757 &dev_attr_local_cpus.attr,
758 &dev_attr_local_cpulist.attr,
759 &dev_attr_modalias.attr,
760 #ifdef CONFIG_NUMA
761 &dev_attr_numa_node.attr,
762 #endif
763 &dev_attr_dma_mask_bits.attr,
764 &dev_attr_consistent_dma_mask_bits.attr,
765 &dev_attr_enable.attr,
766 &dev_attr_broken_parity_status.attr,
767 &dev_attr_msi_bus.attr,
768 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
769 &dev_attr_d3cold_allowed.attr,
770 #endif
771 #ifdef CONFIG_OF
772 &dev_attr_devspec.attr,
773 #endif
774 &dev_attr_driver_override.attr,
775 &dev_attr_ari_enabled.attr,
776 NULL,
777 };
778
779 static struct attribute *pci_bridge_attrs[] = {
780 &dev_attr_subordinate_bus_number.attr,
781 &dev_attr_secondary_bus_number.attr,
782 NULL,
783 };
784
785 static struct attribute *pcie_dev_attrs[] = {
786 &dev_attr_current_link_speed.attr,
787 &dev_attr_current_link_width.attr,
788 &dev_attr_max_link_width.attr,
789 &dev_attr_max_link_speed.attr,
790 NULL,
791 };
792
793 static struct attribute *pcibus_attrs[] = {
794 &dev_attr_rescan.attr,
795 &dev_attr_cpuaffinity.attr,
796 &dev_attr_cpulistaffinity.attr,
797 NULL,
798 };
799
800 static const struct attribute_group pcibus_group = {
801 .attrs = pcibus_attrs,
802 };
803
804 const struct attribute_group *pcibus_groups[] = {
805 &pcibus_group,
806 NULL,
807 };
808
809 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
810 char *buf)
811 {
812 struct pci_dev *pdev = to_pci_dev(dev);
813 struct pci_dev *vga_dev = vga_default_device();
814
815 if (vga_dev)
816 return sprintf(buf, "%u\n", (pdev == vga_dev));
817
818 return sprintf(buf, "%u\n",
819 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
820 IORESOURCE_ROM_SHADOW));
821 }
822 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
823
824 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
825 struct bin_attribute *bin_attr, char *buf,
826 loff_t off, size_t count)
827 {
828 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
829 unsigned int size = 64;
830 loff_t init_off = off;
831 u8 *data = (u8 *) buf;
832
833 /* Several chips lock up trying to read undefined config space */
834 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
835 size = dev->cfg_size;
836 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
837 size = 128;
838
839 if (off > size)
840 return 0;
841 if (off + count > size) {
842 size -= off;
843 count = size;
844 } else {
845 size = count;
846 }
847
848 pci_config_pm_runtime_get(dev);
849
850 if ((off & 1) && size) {
851 u8 val;
852 pci_user_read_config_byte(dev, off, &val);
853 data[off - init_off] = val;
854 off++;
855 size--;
856 }
857
858 if ((off & 3) && size > 2) {
859 u16 val;
860 pci_user_read_config_word(dev, off, &val);
861 data[off - init_off] = val & 0xff;
862 data[off - init_off + 1] = (val >> 8) & 0xff;
863 off += 2;
864 size -= 2;
865 }
866
867 while (size > 3) {
868 u32 val;
869 pci_user_read_config_dword(dev, off, &val);
870 data[off - init_off] = val & 0xff;
871 data[off - init_off + 1] = (val >> 8) & 0xff;
872 data[off - init_off + 2] = (val >> 16) & 0xff;
873 data[off - init_off + 3] = (val >> 24) & 0xff;
874 off += 4;
875 size -= 4;
876 }
877
878 if (size >= 2) {
879 u16 val;
880 pci_user_read_config_word(dev, off, &val);
881 data[off - init_off] = val & 0xff;
882 data[off - init_off + 1] = (val >> 8) & 0xff;
883 off += 2;
884 size -= 2;
885 }
886
887 if (size > 0) {
888 u8 val;
889 pci_user_read_config_byte(dev, off, &val);
890 data[off - init_off] = val;
891 off++;
892 --size;
893 }
894
895 pci_config_pm_runtime_put(dev);
896
897 return count;
898 }
899
900 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
901 struct bin_attribute *bin_attr, char *buf,
902 loff_t off, size_t count)
903 {
904 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
905 unsigned int size = count;
906 loff_t init_off = off;
907 u8 *data = (u8 *) buf;
908
909 if (off > dev->cfg_size)
910 return 0;
911 if (off + count > dev->cfg_size) {
912 size = dev->cfg_size - off;
913 count = size;
914 }
915
916 pci_config_pm_runtime_get(dev);
917
918 if ((off & 1) && size) {
919 pci_user_write_config_byte(dev, off, data[off - init_off]);
920 off++;
921 size--;
922 }
923
924 if ((off & 3) && size > 2) {
925 u16 val = data[off - init_off];
926 val |= (u16) data[off - init_off + 1] << 8;
927 pci_user_write_config_word(dev, off, val);
928 off += 2;
929 size -= 2;
930 }
931
932 while (size > 3) {
933 u32 val = data[off - init_off];
934 val |= (u32) data[off - init_off + 1] << 8;
935 val |= (u32) data[off - init_off + 2] << 16;
936 val |= (u32) data[off - init_off + 3] << 24;
937 pci_user_write_config_dword(dev, off, val);
938 off += 4;
939 size -= 4;
940 }
941
942 if (size >= 2) {
943 u16 val = data[off - init_off];
944 val |= (u16) data[off - init_off + 1] << 8;
945 pci_user_write_config_word(dev, off, val);
946 off += 2;
947 size -= 2;
948 }
949
950 if (size) {
951 pci_user_write_config_byte(dev, off, data[off - init_off]);
952 off++;
953 --size;
954 }
955
956 pci_config_pm_runtime_put(dev);
957
958 return count;
959 }
960
961 #ifdef HAVE_PCI_LEGACY
962 /**
963 * pci_read_legacy_io - read byte(s) from legacy I/O port space
964 * @filp: open sysfs file
965 * @kobj: kobject corresponding to file to read from
966 * @bin_attr: struct bin_attribute for this file
967 * @buf: buffer to store results
968 * @off: offset into legacy I/O port space
969 * @count: number of bytes to read
970 *
971 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
972 * callback routine (pci_legacy_read).
973 */
974 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
975 struct bin_attribute *bin_attr, char *buf,
976 loff_t off, size_t count)
977 {
978 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
979
980 /* Only support 1, 2 or 4 byte accesses */
981 if (count != 1 && count != 2 && count != 4)
982 return -EINVAL;
983
984 return pci_legacy_read(bus, off, (u32 *)buf, count);
985 }
986
987 /**
988 * pci_write_legacy_io - write byte(s) to legacy I/O port space
989 * @filp: open sysfs file
990 * @kobj: kobject corresponding to file to read from
991 * @bin_attr: struct bin_attribute for this file
992 * @buf: buffer containing value to be written
993 * @off: offset into legacy I/O port space
994 * @count: number of bytes to write
995 *
996 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
997 * callback routine (pci_legacy_write).
998 */
999 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
1000 struct bin_attribute *bin_attr, char *buf,
1001 loff_t off, size_t count)
1002 {
1003 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1004
1005 /* Only support 1, 2 or 4 byte accesses */
1006 if (count != 1 && count != 2 && count != 4)
1007 return -EINVAL;
1008
1009 return pci_legacy_write(bus, off, *(u32 *)buf, count);
1010 }
1011
1012 /**
1013 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
1014 * @filp: open sysfs file
1015 * @kobj: kobject corresponding to device to be mapped
1016 * @attr: struct bin_attribute for this file
1017 * @vma: struct vm_area_struct passed to mmap
1018 *
1019 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
1020 * legacy memory space (first meg of bus space) into application virtual
1021 * memory space.
1022 */
1023 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
1024 struct bin_attribute *attr,
1025 struct vm_area_struct *vma)
1026 {
1027 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1028
1029 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
1030 }
1031
1032 /**
1033 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
1034 * @filp: open sysfs file
1035 * @kobj: kobject corresponding to device to be mapped
1036 * @attr: struct bin_attribute for this file
1037 * @vma: struct vm_area_struct passed to mmap
1038 *
1039 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
1040 * legacy IO space (first meg of bus space) into application virtual
1041 * memory space. Returns -ENOSYS if the operation isn't supported
1042 */
1043 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
1044 struct bin_attribute *attr,
1045 struct vm_area_struct *vma)
1046 {
1047 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1048
1049 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
1050 }
1051
1052 /**
1053 * pci_adjust_legacy_attr - adjustment of legacy file attributes
1054 * @b: bus to create files under
1055 * @mmap_type: I/O port or memory
1056 *
1057 * Stub implementation. Can be overridden by arch if necessary.
1058 */
1059 void __weak pci_adjust_legacy_attr(struct pci_bus *b,
1060 enum pci_mmap_state mmap_type)
1061 {
1062 }
1063
1064 /**
1065 * pci_create_legacy_files - create legacy I/O port and memory files
1066 * @b: bus to create files under
1067 *
1068 * Some platforms allow access to legacy I/O port and ISA memory space on
1069 * a per-bus basis. This routine creates the files and ties them into
1070 * their associated read, write and mmap files from pci-sysfs.c
1071 *
1072 * On error unwind, but don't propagate the error to the caller
1073 * as it is ok to set up the PCI bus without these files.
1074 */
1075 void pci_create_legacy_files(struct pci_bus *b)
1076 {
1077 int error;
1078
1079 b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
1080 GFP_ATOMIC);
1081 if (!b->legacy_io)
1082 goto kzalloc_err;
1083
1084 sysfs_bin_attr_init(b->legacy_io);
1085 b->legacy_io->attr.name = "legacy_io";
1086 b->legacy_io->size = 0xffff;
1087 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
1088 b->legacy_io->read = pci_read_legacy_io;
1089 b->legacy_io->write = pci_write_legacy_io;
1090 b->legacy_io->mmap = pci_mmap_legacy_io;
1091 pci_adjust_legacy_attr(b, pci_mmap_io);
1092 error = device_create_bin_file(&b->dev, b->legacy_io);
1093 if (error)
1094 goto legacy_io_err;
1095
1096 /* Allocated above after the legacy_io struct */
1097 b->legacy_mem = b->legacy_io + 1;
1098 sysfs_bin_attr_init(b->legacy_mem);
1099 b->legacy_mem->attr.name = "legacy_mem";
1100 b->legacy_mem->size = 1024*1024;
1101 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
1102 b->legacy_mem->mmap = pci_mmap_legacy_mem;
1103 pci_adjust_legacy_attr(b, pci_mmap_mem);
1104 error = device_create_bin_file(&b->dev, b->legacy_mem);
1105 if (error)
1106 goto legacy_mem_err;
1107
1108 return;
1109
1110 legacy_mem_err:
1111 device_remove_bin_file(&b->dev, b->legacy_io);
1112 legacy_io_err:
1113 kfree(b->legacy_io);
1114 b->legacy_io = NULL;
1115 kzalloc_err:
1116 printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
1117 return;
1118 }
1119
1120 void pci_remove_legacy_files(struct pci_bus *b)
1121 {
1122 if (b->legacy_io) {
1123 device_remove_bin_file(&b->dev, b->legacy_io);
1124 device_remove_bin_file(&b->dev, b->legacy_mem);
1125 kfree(b->legacy_io); /* both are allocated here */
1126 }
1127 }
1128 #endif /* HAVE_PCI_LEGACY */
1129
1130 #if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
1131
1132 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
1133 enum pci_mmap_api mmap_api)
1134 {
1135 unsigned long nr, start, size;
1136 resource_size_t pci_start = 0, pci_end;
1137
1138 if (pci_resource_len(pdev, resno) == 0)
1139 return 0;
1140 nr = vma_pages(vma);
1141 start = vma->vm_pgoff;
1142 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
1143 if (mmap_api == PCI_MMAP_PROCFS) {
1144 pci_resource_to_user(pdev, resno, &pdev->resource[resno],
1145 &pci_start, &pci_end);
1146 pci_start >>= PAGE_SHIFT;
1147 }
1148 if (start >= pci_start && start < pci_start + size &&
1149 start + nr <= pci_start + size)
1150 return 1;
1151 return 0;
1152 }
1153
1154 /**
1155 * pci_mmap_resource - map a PCI resource into user memory space
1156 * @kobj: kobject for mapping
1157 * @attr: struct bin_attribute for the file being mapped
1158 * @vma: struct vm_area_struct passed into the mmap
1159 * @write_combine: 1 for write_combine mapping
1160 *
1161 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1162 */
1163 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1164 struct vm_area_struct *vma, int write_combine)
1165 {
1166 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1167 int bar = (unsigned long)attr->private;
1168 enum pci_mmap_state mmap_type;
1169 struct resource *res = &pdev->resource[bar];
1170
1171 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1172 return -EINVAL;
1173
1174 if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1175 return -EINVAL;
1176
1177 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1178
1179 return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1180 }
1181
1182 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1183 struct bin_attribute *attr,
1184 struct vm_area_struct *vma)
1185 {
1186 return pci_mmap_resource(kobj, attr, vma, 0);
1187 }
1188
1189 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1190 struct bin_attribute *attr,
1191 struct vm_area_struct *vma)
1192 {
1193 return pci_mmap_resource(kobj, attr, vma, 1);
1194 }
1195
1196 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1197 struct bin_attribute *attr, char *buf,
1198 loff_t off, size_t count, bool write)
1199 {
1200 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1201 int bar = (unsigned long)attr->private;
1202 unsigned long port = off;
1203
1204 port += pci_resource_start(pdev, bar);
1205
1206 if (port > pci_resource_end(pdev, bar))
1207 return 0;
1208
1209 if (port + count - 1 > pci_resource_end(pdev, bar))
1210 return -EINVAL;
1211
1212 switch (count) {
1213 case 1:
1214 if (write)
1215 outb(*(u8 *)buf, port);
1216 else
1217 *(u8 *)buf = inb(port);
1218 return 1;
1219 case 2:
1220 if (write)
1221 outw(*(u16 *)buf, port);
1222 else
1223 *(u16 *)buf = inw(port);
1224 return 2;
1225 case 4:
1226 if (write)
1227 outl(*(u32 *)buf, port);
1228 else
1229 *(u32 *)buf = inl(port);
1230 return 4;
1231 }
1232 return -EINVAL;
1233 }
1234
1235 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1236 struct bin_attribute *attr, char *buf,
1237 loff_t off, size_t count)
1238 {
1239 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1240 }
1241
1242 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1243 struct bin_attribute *attr, char *buf,
1244 loff_t off, size_t count)
1245 {
1246 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1247 }
1248
1249 /**
1250 * pci_remove_resource_files - cleanup resource files
1251 * @pdev: dev to cleanup
1252 *
1253 * If we created resource files for @pdev, remove them from sysfs and
1254 * free their resources.
1255 */
1256 static void pci_remove_resource_files(struct pci_dev *pdev)
1257 {
1258 int i;
1259
1260 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1261 struct bin_attribute *res_attr;
1262
1263 res_attr = pdev->res_attr[i];
1264 if (res_attr) {
1265 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1266 kfree(res_attr);
1267 }
1268
1269 res_attr = pdev->res_attr_wc[i];
1270 if (res_attr) {
1271 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1272 kfree(res_attr);
1273 }
1274 }
1275 }
1276
1277 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1278 {
1279 /* allocate attribute structure, piggyback attribute name */
1280 int name_len = write_combine ? 13 : 10;
1281 struct bin_attribute *res_attr;
1282 char *res_attr_name;
1283 int retval;
1284
1285 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1286 if (!res_attr)
1287 return -ENOMEM;
1288
1289 res_attr_name = (char *)(res_attr + 1);
1290
1291 sysfs_bin_attr_init(res_attr);
1292 if (write_combine) {
1293 pdev->res_attr_wc[num] = res_attr;
1294 sprintf(res_attr_name, "resource%d_wc", num);
1295 res_attr->mmap = pci_mmap_resource_wc;
1296 } else {
1297 pdev->res_attr[num] = res_attr;
1298 sprintf(res_attr_name, "resource%d", num);
1299 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1300 res_attr->read = pci_read_resource_io;
1301 res_attr->write = pci_write_resource_io;
1302 if (arch_can_pci_mmap_io())
1303 res_attr->mmap = pci_mmap_resource_uc;
1304 } else {
1305 res_attr->mmap = pci_mmap_resource_uc;
1306 }
1307 }
1308 res_attr->attr.name = res_attr_name;
1309 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1310 res_attr->size = pci_resource_len(pdev, num);
1311 res_attr->private = (void *)(unsigned long)num;
1312 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1313 if (retval)
1314 kfree(res_attr);
1315
1316 return retval;
1317 }
1318
1319 /**
1320 * pci_create_resource_files - create resource files in sysfs for @dev
1321 * @pdev: dev in question
1322 *
1323 * Walk the resources in @pdev creating files for each resource available.
1324 */
1325 static int pci_create_resource_files(struct pci_dev *pdev)
1326 {
1327 int i;
1328 int retval;
1329
1330 /* Expose the PCI resources from this device as files */
1331 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1332
1333 /* skip empty resources */
1334 if (!pci_resource_len(pdev, i))
1335 continue;
1336
1337 retval = pci_create_attr(pdev, i, 0);
1338 /* for prefetchable resources, create a WC mappable file */
1339 if (!retval && arch_can_pci_mmap_wc() &&
1340 pdev->resource[i].flags & IORESOURCE_PREFETCH)
1341 retval = pci_create_attr(pdev, i, 1);
1342 if (retval) {
1343 pci_remove_resource_files(pdev);
1344 return retval;
1345 }
1346 }
1347 return 0;
1348 }
1349 #else /* !HAVE_PCI_MMAP */
1350 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1351 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1352 #endif /* HAVE_PCI_MMAP */
1353
1354 /**
1355 * pci_write_rom - used to enable access to the PCI ROM display
1356 * @filp: sysfs file
1357 * @kobj: kernel object handle
1358 * @bin_attr: struct bin_attribute for this file
1359 * @buf: user input
1360 * @off: file offset
1361 * @count: number of byte in input
1362 *
1363 * writing anything except 0 enables it
1364 */
1365 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1366 struct bin_attribute *bin_attr, char *buf,
1367 loff_t off, size_t count)
1368 {
1369 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1370
1371 if ((off == 0) && (*buf == '0') && (count == 2))
1372 pdev->rom_attr_enabled = 0;
1373 else
1374 pdev->rom_attr_enabled = 1;
1375
1376 return count;
1377 }
1378
1379 /**
1380 * pci_read_rom - read a PCI ROM
1381 * @filp: sysfs file
1382 * @kobj: kernel object handle
1383 * @bin_attr: struct bin_attribute for this file
1384 * @buf: where to put the data we read from the ROM
1385 * @off: file offset
1386 * @count: number of bytes to read
1387 *
1388 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1389 * device corresponding to @kobj.
1390 */
1391 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1392 struct bin_attribute *bin_attr, char *buf,
1393 loff_t off, size_t count)
1394 {
1395 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1396 void __iomem *rom;
1397 size_t size;
1398
1399 if (!pdev->rom_attr_enabled)
1400 return -EINVAL;
1401
1402 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1403 if (!rom || !size)
1404 return -EIO;
1405
1406 if (off >= size)
1407 count = 0;
1408 else {
1409 if (off + count > size)
1410 count = size - off;
1411
1412 memcpy_fromio(buf, rom + off, count);
1413 }
1414 pci_unmap_rom(pdev, rom);
1415
1416 return count;
1417 }
1418
1419 static const struct bin_attribute pci_config_attr = {
1420 .attr = {
1421 .name = "config",
1422 .mode = S_IRUGO | S_IWUSR,
1423 },
1424 .size = PCI_CFG_SPACE_SIZE,
1425 .read = pci_read_config,
1426 .write = pci_write_config,
1427 };
1428
1429 static const struct bin_attribute pcie_config_attr = {
1430 .attr = {
1431 .name = "config",
1432 .mode = S_IRUGO | S_IWUSR,
1433 },
1434 .size = PCI_CFG_SPACE_EXP_SIZE,
1435 .read = pci_read_config,
1436 .write = pci_write_config,
1437 };
1438
1439 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1440 const char *buf, size_t count)
1441 {
1442 struct pci_dev *pdev = to_pci_dev(dev);
1443 unsigned long val;
1444 ssize_t result = kstrtoul(buf, 0, &val);
1445
1446 if (result < 0)
1447 return result;
1448
1449 if (val != 1)
1450 return -EINVAL;
1451
1452 result = pci_reset_function(pdev);
1453 if (result < 0)
1454 return result;
1455
1456 return count;
1457 }
1458
1459 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1460
1461 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1462 {
1463 int retval;
1464
1465 pcie_vpd_create_sysfs_dev_files(dev);
1466 pcie_aspm_create_sysfs_dev_files(dev);
1467
1468 if (dev->reset_fn) {
1469 retval = device_create_file(&dev->dev, &reset_attr);
1470 if (retval)
1471 goto error;
1472 }
1473 return 0;
1474
1475 error:
1476 pcie_aspm_remove_sysfs_dev_files(dev);
1477 pcie_vpd_remove_sysfs_dev_files(dev);
1478 return retval;
1479 }
1480
1481 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1482 {
1483 int retval;
1484 int rom_size;
1485 struct bin_attribute *attr;
1486
1487 if (!sysfs_initialized)
1488 return -EACCES;
1489
1490 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1491 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1492 else
1493 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1494 if (retval)
1495 goto err;
1496
1497 retval = pci_create_resource_files(pdev);
1498 if (retval)
1499 goto err_config_file;
1500
1501 /* If the device has a ROM, try to expose it in sysfs. */
1502 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1503 if (rom_size) {
1504 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1505 if (!attr) {
1506 retval = -ENOMEM;
1507 goto err_resource_files;
1508 }
1509 sysfs_bin_attr_init(attr);
1510 attr->size = rom_size;
1511 attr->attr.name = "rom";
1512 attr->attr.mode = S_IRUSR | S_IWUSR;
1513 attr->read = pci_read_rom;
1514 attr->write = pci_write_rom;
1515 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1516 if (retval) {
1517 kfree(attr);
1518 goto err_resource_files;
1519 }
1520 pdev->rom_attr = attr;
1521 }
1522
1523 /* add sysfs entries for various capabilities */
1524 retval = pci_create_capabilities_sysfs(pdev);
1525 if (retval)
1526 goto err_rom_file;
1527
1528 pci_create_firmware_label_files(pdev);
1529
1530 return 0;
1531
1532 err_rom_file:
1533 if (pdev->rom_attr) {
1534 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1535 kfree(pdev->rom_attr);
1536 pdev->rom_attr = NULL;
1537 }
1538 err_resource_files:
1539 pci_remove_resource_files(pdev);
1540 err_config_file:
1541 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1542 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1543 else
1544 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1545 err:
1546 return retval;
1547 }
1548
1549 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1550 {
1551 pcie_vpd_remove_sysfs_dev_files(dev);
1552 pcie_aspm_remove_sysfs_dev_files(dev);
1553 if (dev->reset_fn) {
1554 device_remove_file(&dev->dev, &reset_attr);
1555 dev->reset_fn = 0;
1556 }
1557 }
1558
1559 /**
1560 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1561 * @pdev: device whose entries we should free
1562 *
1563 * Cleanup when @pdev is removed from sysfs.
1564 */
1565 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1566 {
1567 if (!sysfs_initialized)
1568 return;
1569
1570 pci_remove_capabilities_sysfs(pdev);
1571
1572 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1573 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1574 else
1575 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1576
1577 pci_remove_resource_files(pdev);
1578
1579 if (pdev->rom_attr) {
1580 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1581 kfree(pdev->rom_attr);
1582 pdev->rom_attr = NULL;
1583 }
1584
1585 pci_remove_firmware_label_files(pdev);
1586 }
1587
1588 static int __init pci_sysfs_init(void)
1589 {
1590 struct pci_dev *pdev = NULL;
1591 int retval;
1592
1593 sysfs_initialized = 1;
1594 for_each_pci_dev(pdev) {
1595 retval = pci_create_sysfs_dev_files(pdev);
1596 if (retval) {
1597 pci_dev_put(pdev);
1598 return retval;
1599 }
1600 }
1601
1602 return 0;
1603 }
1604 late_initcall(pci_sysfs_init);
1605
1606 static struct attribute *pci_dev_dev_attrs[] = {
1607 &vga_attr.attr,
1608 NULL,
1609 };
1610
1611 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1612 struct attribute *a, int n)
1613 {
1614 struct device *dev = kobj_to_dev(kobj);
1615 struct pci_dev *pdev = to_pci_dev(dev);
1616
1617 if (a == &vga_attr.attr)
1618 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1619 return 0;
1620
1621 return a->mode;
1622 }
1623
1624 static struct attribute *pci_dev_hp_attrs[] = {
1625 &dev_remove_attr.attr,
1626 &dev_rescan_attr.attr,
1627 NULL,
1628 };
1629
1630 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1631 struct attribute *a, int n)
1632 {
1633 struct device *dev = kobj_to_dev(kobj);
1634 struct pci_dev *pdev = to_pci_dev(dev);
1635
1636 if (pdev->is_virtfn)
1637 return 0;
1638
1639 return a->mode;
1640 }
1641
1642 static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1643 struct attribute *a, int n)
1644 {
1645 struct device *dev = kobj_to_dev(kobj);
1646 struct pci_dev *pdev = to_pci_dev(dev);
1647
1648 if (pci_is_bridge(pdev))
1649 return a->mode;
1650
1651 return 0;
1652 }
1653
1654 static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1655 struct attribute *a, int n)
1656 {
1657 struct device *dev = kobj_to_dev(kobj);
1658 struct pci_dev *pdev = to_pci_dev(dev);
1659
1660 if (pci_is_pcie(pdev))
1661 return a->mode;
1662
1663 return 0;
1664 }
1665
1666 static const struct attribute_group pci_dev_group = {
1667 .attrs = pci_dev_attrs,
1668 };
1669
1670 const struct attribute_group *pci_dev_groups[] = {
1671 &pci_dev_group,
1672 NULL,
1673 };
1674
1675 static const struct attribute_group pci_bridge_group = {
1676 .attrs = pci_bridge_attrs,
1677 };
1678
1679 const struct attribute_group *pci_bridge_groups[] = {
1680 &pci_bridge_group,
1681 NULL,
1682 };
1683
1684 static const struct attribute_group pcie_dev_group = {
1685 .attrs = pcie_dev_attrs,
1686 };
1687
1688 const struct attribute_group *pcie_dev_groups[] = {
1689 &pcie_dev_group,
1690 NULL,
1691 };
1692
1693 static const struct attribute_group pci_dev_hp_attr_group = {
1694 .attrs = pci_dev_hp_attrs,
1695 .is_visible = pci_dev_hp_attrs_are_visible,
1696 };
1697
1698 #ifdef CONFIG_PCI_IOV
1699 static struct attribute *sriov_dev_attrs[] = {
1700 &sriov_totalvfs_attr.attr,
1701 &sriov_numvfs_attr.attr,
1702 &sriov_offset_attr.attr,
1703 &sriov_stride_attr.attr,
1704 &sriov_vf_device_attr.attr,
1705 &sriov_drivers_autoprobe_attr.attr,
1706 NULL,
1707 };
1708
1709 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1710 struct attribute *a, int n)
1711 {
1712 struct device *dev = kobj_to_dev(kobj);
1713
1714 if (!dev_is_pf(dev))
1715 return 0;
1716
1717 return a->mode;
1718 }
1719
1720 static const struct attribute_group sriov_dev_attr_group = {
1721 .attrs = sriov_dev_attrs,
1722 .is_visible = sriov_attrs_are_visible,
1723 };
1724 #endif /* CONFIG_PCI_IOV */
1725
1726 static const struct attribute_group pci_dev_attr_group = {
1727 .attrs = pci_dev_dev_attrs,
1728 .is_visible = pci_dev_attrs_are_visible,
1729 };
1730
1731 static const struct attribute_group pci_bridge_attr_group = {
1732 .attrs = pci_bridge_attrs,
1733 .is_visible = pci_bridge_attrs_are_visible,
1734 };
1735
1736 static const struct attribute_group pcie_dev_attr_group = {
1737 .attrs = pcie_dev_attrs,
1738 .is_visible = pcie_dev_attrs_are_visible,
1739 };
1740
1741 static const struct attribute_group *pci_dev_attr_groups[] = {
1742 &pci_dev_attr_group,
1743 &pci_dev_hp_attr_group,
1744 #ifdef CONFIG_PCI_IOV
1745 &sriov_dev_attr_group,
1746 #endif
1747 &pci_bridge_attr_group,
1748 &pcie_dev_attr_group,
1749 NULL,
1750 };
1751
1752 const struct device_type pci_dev_type = {
1753 .groups = pci_dev_attr_groups,
1754 };
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