?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 4.16.11
[linux/fpc-iii.git] / drivers / pci / pci-sysfs.c
blobeb6bee8724cc1c9243213ab446666bac6c9395eb
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * drivers/pci/pci-sysfs.c
4 *
5 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
6 * (C) Copyright 2002-2004 IBM Corp.
7 * (C) Copyright 2003 Matthew Wilcox
8 * (C) Copyright 2003 Hewlett-Packard
9 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
10 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
11 *
12 * File attributes for PCI devices
13 *
14 * Modeled after usb's driverfs.c
15 *
16 */
17
18
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
21 #include <linux/pci.h>
22 #include <linux/stat.h>
23 #include <linux/export.h>
24 #include <linux/topology.h>
25 #include <linux/mm.h>
26 #include <linux/fs.h>
27 #include <linux/capability.h>
28 #include <linux/security.h>
29 #include <linux/pci-aspm.h>
30 #include <linux/slab.h>
31 #include <linux/vgaarb.h>
32 #include <linux/pm_runtime.h>
33 #include <linux/of.h>
34 #include "pci.h"
35
36 static int sysfs_initialized; /* = 0 */
37
38 /* show configuration fields */
39 #define pci_config_attr(field, format_string) \
40 static ssize_t \
41 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
42 { \
43 struct pci_dev *pdev; \
44 \
45 pdev = to_pci_dev(dev); \
46 return sprintf(buf, format_string, pdev->field); \
47 } \
48 static DEVICE_ATTR_RO(field)
49
50 pci_config_attr(vendor, "0x%04x\n");
51 pci_config_attr(device, "0x%04x\n");
52 pci_config_attr(subsystem_vendor, "0x%04x\n");
53 pci_config_attr(subsystem_device, "0x%04x\n");
54 pci_config_attr(revision, "0x%02x\n");
55 pci_config_attr(class, "0x%06x\n");
56 pci_config_attr(irq, "%u\n");
57
58 static ssize_t broken_parity_status_show(struct device *dev,
59 struct device_attribute *attr,
60 char *buf)
61 {
62 struct pci_dev *pdev = to_pci_dev(dev);
63 return sprintf(buf, "%u\n", pdev->broken_parity_status);
64 }
65
66 static ssize_t broken_parity_status_store(struct device *dev,
67 struct device_attribute *attr,
68 const char *buf, size_t count)
69 {
70 struct pci_dev *pdev = to_pci_dev(dev);
71 unsigned long val;
72
73 if (kstrtoul(buf, 0, &val) < 0)
74 return -EINVAL;
75
76 pdev->broken_parity_status = !!val;
77
78 return count;
79 }
80 static DEVICE_ATTR_RW(broken_parity_status);
81
82 static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
83 struct device_attribute *attr, char *buf)
84 {
85 const struct cpumask *mask;
86
87 #ifdef CONFIG_NUMA
88 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
89 cpumask_of_node(dev_to_node(dev));
90 #else
91 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
92 #endif
93 return cpumap_print_to_pagebuf(list, buf, mask);
94 }
95
96 static ssize_t local_cpus_show(struct device *dev,
97 struct device_attribute *attr, char *buf)
98 {
99 return pci_dev_show_local_cpu(dev, false, attr, buf);
100 }
101 static DEVICE_ATTR_RO(local_cpus);
102
103 static ssize_t local_cpulist_show(struct device *dev,
104 struct device_attribute *attr, char *buf)
105 {
106 return pci_dev_show_local_cpu(dev, true, attr, buf);
107 }
108 static DEVICE_ATTR_RO(local_cpulist);
109
110 /*
111 * PCI Bus Class Devices
112 */
113 static ssize_t cpuaffinity_show(struct device *dev,
114 struct device_attribute *attr, char *buf)
115 {
116 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
117
118 return cpumap_print_to_pagebuf(false, buf, cpumask);
119 }
120 static DEVICE_ATTR_RO(cpuaffinity);
121
122 static ssize_t cpulistaffinity_show(struct device *dev,
123 struct device_attribute *attr, char *buf)
124 {
125 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
126
127 return cpumap_print_to_pagebuf(true, buf, cpumask);
128 }
129 static DEVICE_ATTR_RO(cpulistaffinity);
130
131 /* show resources */
132 static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
133 char *buf)
134 {
135 struct pci_dev *pci_dev = to_pci_dev(dev);
136 char *str = buf;
137 int i;
138 int max;
139 resource_size_t start, end;
140
141 if (pci_dev->subordinate)
142 max = DEVICE_COUNT_RESOURCE;
143 else
144 max = PCI_BRIDGE_RESOURCES;
145
146 for (i = 0; i < max; i++) {
147 struct resource *res = &pci_dev->resource[i];
148 pci_resource_to_user(pci_dev, i, res, &start, &end);
149 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
150 (unsigned long long)start,
151 (unsigned long long)end,
152 (unsigned long long)res->flags);
153 }
154 return (str - buf);
155 }
156 static DEVICE_ATTR_RO(resource);
157
158 static ssize_t max_link_speed_show(struct device *dev,
159 struct device_attribute *attr, char *buf)
160 {
161 struct pci_dev *pci_dev = to_pci_dev(dev);
162 u32 linkcap;
163 int err;
164 const char *speed;
165
166 err = pcie_capability_read_dword(pci_dev, PCI_EXP_LNKCAP, &linkcap);
167 if (err)
168 return -EINVAL;
169
170 switch (linkcap & PCI_EXP_LNKCAP_SLS) {
171 case PCI_EXP_LNKCAP_SLS_8_0GB:
172 speed = "8 GT/s";
173 break;
174 case PCI_EXP_LNKCAP_SLS_5_0GB:
175 speed = "5 GT/s";
176 break;
177 case PCI_EXP_LNKCAP_SLS_2_5GB:
178 speed = "2.5 GT/s";
179 break;
180 default:
181 speed = "Unknown speed";
182 }
183
184 return sprintf(buf, "%s\n", speed);
185 }
186 static DEVICE_ATTR_RO(max_link_speed);
187
188 static ssize_t max_link_width_show(struct device *dev,
189 struct device_attribute *attr, char *buf)
190 {
191 struct pci_dev *pci_dev = to_pci_dev(dev);
192 u32 linkcap;
193 int err;
194
195 err = pcie_capability_read_dword(pci_dev, PCI_EXP_LNKCAP, &linkcap);
196 if (err)
197 return -EINVAL;
198
199 return sprintf(buf, "%u\n", (linkcap & PCI_EXP_LNKCAP_MLW) >> 4);
200 }
201 static DEVICE_ATTR_RO(max_link_width);
202
203 static ssize_t current_link_speed_show(struct device *dev,
204 struct device_attribute *attr, char *buf)
205 {
206 struct pci_dev *pci_dev = to_pci_dev(dev);
207 u16 linkstat;
208 int err;
209 const char *speed;
210
211 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
212 if (err)
213 return -EINVAL;
214
215 switch (linkstat & PCI_EXP_LNKSTA_CLS) {
216 case PCI_EXP_LNKSTA_CLS_8_0GB:
217 speed = "8 GT/s";
218 break;
219 case PCI_EXP_LNKSTA_CLS_5_0GB:
220 speed = "5 GT/s";
221 break;
222 case PCI_EXP_LNKSTA_CLS_2_5GB:
223 speed = "2.5 GT/s";
224 break;
225 default:
226 speed = "Unknown speed";
227 }
228
229 return sprintf(buf, "%s\n", speed);
230 }
231 static DEVICE_ATTR_RO(current_link_speed);
232
233 static ssize_t current_link_width_show(struct device *dev,
234 struct device_attribute *attr, char *buf)
235 {
236 struct pci_dev *pci_dev = to_pci_dev(dev);
237 u16 linkstat;
238 int err;
239
240 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
241 if (err)
242 return -EINVAL;
243
244 return sprintf(buf, "%u\n",
245 (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
246 }
247 static DEVICE_ATTR_RO(current_link_width);
248
249 static ssize_t secondary_bus_number_show(struct device *dev,
250 struct device_attribute *attr,
251 char *buf)
252 {
253 struct pci_dev *pci_dev = to_pci_dev(dev);
254 u8 sec_bus;
255 int err;
256
257 err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
258 if (err)
259 return -EINVAL;
260
261 return sprintf(buf, "%u\n", sec_bus);
262 }
263 static DEVICE_ATTR_RO(secondary_bus_number);
264
265 static ssize_t subordinate_bus_number_show(struct device *dev,
266 struct device_attribute *attr,
267 char *buf)
268 {
269 struct pci_dev *pci_dev = to_pci_dev(dev);
270 u8 sub_bus;
271 int err;
272
273 err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
274 if (err)
275 return -EINVAL;
276
277 return sprintf(buf, "%u\n", sub_bus);
278 }
279 static DEVICE_ATTR_RO(subordinate_bus_number);
280
281 static ssize_t ari_enabled_show(struct device *dev,
282 struct device_attribute *attr,
283 char *buf)
284 {
285 struct pci_dev *pci_dev = to_pci_dev(dev);
286
287 return sprintf(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
288 }
289 static DEVICE_ATTR_RO(ari_enabled);
290
291 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
292 char *buf)
293 {
294 struct pci_dev *pci_dev = to_pci_dev(dev);
295
296 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
297 pci_dev->vendor, pci_dev->device,
298 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
299 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
300 (u8)(pci_dev->class));
301 }
302 static DEVICE_ATTR_RO(modalias);
303
304 static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
305 const char *buf, size_t count)
306 {
307 struct pci_dev *pdev = to_pci_dev(dev);
308 unsigned long val;
309 ssize_t result = kstrtoul(buf, 0, &val);
310
311 if (result < 0)
312 return result;
313
314 /* this can crash the machine when done on the "wrong" device */
315 if (!capable(CAP_SYS_ADMIN))
316 return -EPERM;
317
318 if (!val) {
319 if (pci_is_enabled(pdev))
320 pci_disable_device(pdev);
321 else
322 result = -EIO;
323 } else
324 result = pci_enable_device(pdev);
325
326 return result < 0 ? result : count;
327 }
328
329 static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
330 char *buf)
331 {
332 struct pci_dev *pdev;
333
334 pdev = to_pci_dev(dev);
335 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
336 }
337 static DEVICE_ATTR_RW(enable);
338
339 #ifdef CONFIG_NUMA
340 static ssize_t numa_node_store(struct device *dev,
341 struct device_attribute *attr, const char *buf,
342 size_t count)
343 {
344 struct pci_dev *pdev = to_pci_dev(dev);
345 int node, ret;
346
347 if (!capable(CAP_SYS_ADMIN))
348 return -EPERM;
349
350 ret = kstrtoint(buf, 0, &node);
351 if (ret)
352 return ret;
353
354 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
355 return -EINVAL;
356
357 if (node != NUMA_NO_NODE && !node_online(node))
358 return -EINVAL;
359
360 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
361 pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
362 node);
363
364 dev->numa_node = node;
365 return count;
366 }
367
368 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
369 char *buf)
370 {
371 return sprintf(buf, "%d\n", dev->numa_node);
372 }
373 static DEVICE_ATTR_RW(numa_node);
374 #endif
375
376 static ssize_t dma_mask_bits_show(struct device *dev,
377 struct device_attribute *attr, char *buf)
378 {
379 struct pci_dev *pdev = to_pci_dev(dev);
380
381 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
382 }
383 static DEVICE_ATTR_RO(dma_mask_bits);
384
385 static ssize_t consistent_dma_mask_bits_show(struct device *dev,
386 struct device_attribute *attr,
387 char *buf)
388 {
389 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
390 }
391 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
392
393 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
394 char *buf)
395 {
396 struct pci_dev *pdev = to_pci_dev(dev);
397 struct pci_bus *subordinate = pdev->subordinate;
398
399 return sprintf(buf, "%u\n", subordinate ?
400 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
401 : !pdev->no_msi);
402 }
403
404 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
405 const char *buf, size_t count)
406 {
407 struct pci_dev *pdev = to_pci_dev(dev);
408 struct pci_bus *subordinate = pdev->subordinate;
409 unsigned long val;
410
411 if (kstrtoul(buf, 0, &val) < 0)
412 return -EINVAL;
413
414 if (!capable(CAP_SYS_ADMIN))
415 return -EPERM;
416
417 /*
418 * "no_msi" and "bus_flags" only affect what happens when a driver
419 * requests MSI or MSI-X. They don't affect any drivers that have
420 * already requested MSI or MSI-X.
421 */
422 if (!subordinate) {
423 pdev->no_msi = !val;
424 pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
425 val ? "allowed" : "disallowed");
426 return count;
427 }
428
429 if (val)
430 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
431 else
432 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
433
434 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
435 val ? "allowed" : "disallowed");
436 return count;
437 }
438 static DEVICE_ATTR_RW(msi_bus);
439
440 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
441 size_t count)
442 {
443 unsigned long val;
444 struct pci_bus *b = NULL;
445
446 if (kstrtoul(buf, 0, &val) < 0)
447 return -EINVAL;
448
449 if (val) {
450 pci_lock_rescan_remove();
451 while ((b = pci_find_next_bus(b)) != NULL)
452 pci_rescan_bus(b);
453 pci_unlock_rescan_remove();
454 }
455 return count;
456 }
457 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
458
459 static struct attribute *pci_bus_attrs[] = {
460 &bus_attr_rescan.attr,
461 NULL,
462 };
463
464 static const struct attribute_group pci_bus_group = {
465 .attrs = pci_bus_attrs,
466 };
467
468 const struct attribute_group *pci_bus_groups[] = {
469 &pci_bus_group,
470 NULL,
471 };
472
473 static ssize_t dev_rescan_store(struct device *dev,
474 struct device_attribute *attr, const char *buf,
475 size_t count)
476 {
477 unsigned long val;
478 struct pci_dev *pdev = to_pci_dev(dev);
479
480 if (kstrtoul(buf, 0, &val) < 0)
481 return -EINVAL;
482
483 if (val) {
484 pci_lock_rescan_remove();
485 pci_rescan_bus(pdev->bus);
486 pci_unlock_rescan_remove();
487 }
488 return count;
489 }
490 static struct device_attribute dev_rescan_attr = __ATTR(rescan,
491 (S_IWUSR|S_IWGRP),
492 NULL, dev_rescan_store);
493
494 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
495 const char *buf, size_t count)
496 {
497 unsigned long val;
498
499 if (kstrtoul(buf, 0, &val) < 0)
500 return -EINVAL;
501
502 if (val && device_remove_file_self(dev, attr))
503 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
504 return count;
505 }
506 static struct device_attribute dev_remove_attr = __ATTR(remove,
507 (S_IWUSR|S_IWGRP),
508 NULL, remove_store);
509
510 static ssize_t dev_bus_rescan_store(struct device *dev,
511 struct device_attribute *attr,
512 const char *buf, size_t count)
513 {
514 unsigned long val;
515 struct pci_bus *bus = to_pci_bus(dev);
516
517 if (kstrtoul(buf, 0, &val) < 0)
518 return -EINVAL;
519
520 if (val) {
521 pci_lock_rescan_remove();
522 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
523 pci_rescan_bus_bridge_resize(bus->self);
524 else
525 pci_rescan_bus(bus);
526 pci_unlock_rescan_remove();
527 }
528 return count;
529 }
530 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
531
532 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
533 static ssize_t d3cold_allowed_store(struct device *dev,
534 struct device_attribute *attr,
535 const char *buf, size_t count)
536 {
537 struct pci_dev *pdev = to_pci_dev(dev);
538 unsigned long val;
539
540 if (kstrtoul(buf, 0, &val) < 0)
541 return -EINVAL;
542
543 pdev->d3cold_allowed = !!val;
544 if (pdev->d3cold_allowed)
545 pci_d3cold_enable(pdev);
546 else
547 pci_d3cold_disable(pdev);
548
549 pm_runtime_resume(dev);
550
551 return count;
552 }
553
554 static ssize_t d3cold_allowed_show(struct device *dev,
555 struct device_attribute *attr, char *buf)
556 {
557 struct pci_dev *pdev = to_pci_dev(dev);
558 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
559 }
560 static DEVICE_ATTR_RW(d3cold_allowed);
561 #endif
562
563 #ifdef CONFIG_OF
564 static ssize_t devspec_show(struct device *dev,
565 struct device_attribute *attr, char *buf)
566 {
567 struct pci_dev *pdev = to_pci_dev(dev);
568 struct device_node *np = pci_device_to_OF_node(pdev);
569
570 if (np == NULL)
571 return 0;
572 return sprintf(buf, "%pOF", np);
573 }
574 static DEVICE_ATTR_RO(devspec);
575 #endif
576
577 #ifdef CONFIG_PCI_IOV
578 static ssize_t sriov_totalvfs_show(struct device *dev,
579 struct device_attribute *attr,
580 char *buf)
581 {
582 struct pci_dev *pdev = to_pci_dev(dev);
583
584 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
585 }
586
587
588 static ssize_t sriov_numvfs_show(struct device *dev,
589 struct device_attribute *attr,
590 char *buf)
591 {
592 struct pci_dev *pdev = to_pci_dev(dev);
593
594 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
595 }
596
597 /*
598 * num_vfs > 0; number of VFs to enable
599 * num_vfs = 0; disable all VFs
600 *
601 * Note: SRIOV spec doesn't allow partial VF
602 * disable, so it's all or none.
603 */
604 static ssize_t sriov_numvfs_store(struct device *dev,
605 struct device_attribute *attr,
606 const char *buf, size_t count)
607 {
608 struct pci_dev *pdev = to_pci_dev(dev);
609 int ret;
610 u16 num_vfs;
611
612 ret = kstrtou16(buf, 0, &num_vfs);
613 if (ret < 0)
614 return ret;
615
616 if (num_vfs > pci_sriov_get_totalvfs(pdev))
617 return -ERANGE;
618
619 device_lock(&pdev->dev);
620
621 if (num_vfs == pdev->sriov->num_VFs)
622 goto exit;
623
624 /* is PF driver loaded w/callback */
625 if (!pdev->driver || !pdev->driver->sriov_configure) {
626 pci_info(pdev, "Driver doesn't support SRIOV configuration via sysfs\n");
627 ret = -ENOENT;
628 goto exit;
629 }
630
631 if (num_vfs == 0) {
632 /* disable VFs */
633 ret = pdev->driver->sriov_configure(pdev, 0);
634 goto exit;
635 }
636
637 /* enable VFs */
638 if (pdev->sriov->num_VFs) {
639 pci_warn(pdev, "%d VFs already enabled. Disable before enabling %d VFs\n",
640 pdev->sriov->num_VFs, num_vfs);
641 ret = -EBUSY;
642 goto exit;
643 }
644
645 ret = pdev->driver->sriov_configure(pdev, num_vfs);
646 if (ret < 0)
647 goto exit;
648
649 if (ret != num_vfs)
650 pci_warn(pdev, "%d VFs requested; only %d enabled\n",
651 num_vfs, ret);
652
653 exit:
654 device_unlock(&pdev->dev);
655
656 if (ret < 0)
657 return ret;
658
659 return count;
660 }
661
662 static ssize_t sriov_offset_show(struct device *dev,
663 struct device_attribute *attr,
664 char *buf)
665 {
666 struct pci_dev *pdev = to_pci_dev(dev);
667
668 return sprintf(buf, "%u\n", pdev->sriov->offset);
669 }
670
671 static ssize_t sriov_stride_show(struct device *dev,
672 struct device_attribute *attr,
673 char *buf)
674 {
675 struct pci_dev *pdev = to_pci_dev(dev);
676
677 return sprintf(buf, "%u\n", pdev->sriov->stride);
678 }
679
680 static ssize_t sriov_vf_device_show(struct device *dev,
681 struct device_attribute *attr,
682 char *buf)
683 {
684 struct pci_dev *pdev = to_pci_dev(dev);
685
686 return sprintf(buf, "%x\n", pdev->sriov->vf_device);
687 }
688
689 static ssize_t sriov_drivers_autoprobe_show(struct device *dev,
690 struct device_attribute *attr,
691 char *buf)
692 {
693 struct pci_dev *pdev = to_pci_dev(dev);
694
695 return sprintf(buf, "%u\n", pdev->sriov->drivers_autoprobe);
696 }
697
698 static ssize_t sriov_drivers_autoprobe_store(struct device *dev,
699 struct device_attribute *attr,
700 const char *buf, size_t count)
701 {
702 struct pci_dev *pdev = to_pci_dev(dev);
703 bool drivers_autoprobe;
704
705 if (kstrtobool(buf, &drivers_autoprobe) < 0)
706 return -EINVAL;
707
708 pdev->sriov->drivers_autoprobe = drivers_autoprobe;
709
710 return count;
711 }
712
713 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
714 static struct device_attribute sriov_numvfs_attr =
715 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
716 sriov_numvfs_show, sriov_numvfs_store);
717 static struct device_attribute sriov_offset_attr = __ATTR_RO(sriov_offset);
718 static struct device_attribute sriov_stride_attr = __ATTR_RO(sriov_stride);
719 static struct device_attribute sriov_vf_device_attr = __ATTR_RO(sriov_vf_device);
720 static struct device_attribute sriov_drivers_autoprobe_attr =
721 __ATTR(sriov_drivers_autoprobe, (S_IRUGO|S_IWUSR|S_IWGRP),
722 sriov_drivers_autoprobe_show, sriov_drivers_autoprobe_store);
723 #endif /* CONFIG_PCI_IOV */
724
725 static ssize_t driver_override_store(struct device *dev,
726 struct device_attribute *attr,
727 const char *buf, size_t count)
728 {
729 struct pci_dev *pdev = to_pci_dev(dev);
730 char *driver_override, *old, *cp;
731
732 /* We need to keep extra room for a newline */
733 if (count >= (PAGE_SIZE - 1))
734 return -EINVAL;
735
736 driver_override = kstrndup(buf, count, GFP_KERNEL);
737 if (!driver_override)
738 return -ENOMEM;
739
740 cp = strchr(driver_override, '\n');
741 if (cp)
742 *cp = '\0';
743
744 device_lock(dev);
745 old = pdev->driver_override;
746 if (strlen(driver_override)) {
747 pdev->driver_override = driver_override;
748 } else {
749 kfree(driver_override);
750 pdev->driver_override = NULL;
751 }
752 device_unlock(dev);
753
754 kfree(old);
755
756 return count;
757 }
758
759 static ssize_t driver_override_show(struct device *dev,
760 struct device_attribute *attr, char *buf)
761 {
762 struct pci_dev *pdev = to_pci_dev(dev);
763 ssize_t len;
764
765 device_lock(dev);
766 len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
767 device_unlock(dev);
768 return len;
769 }
770 static DEVICE_ATTR_RW(driver_override);
771
772 static struct attribute *pci_dev_attrs[] = {
773 &dev_attr_resource.attr,
774 &dev_attr_vendor.attr,
775 &dev_attr_device.attr,
776 &dev_attr_subsystem_vendor.attr,
777 &dev_attr_subsystem_device.attr,
778 &dev_attr_revision.attr,
779 &dev_attr_class.attr,
780 &dev_attr_irq.attr,
781 &dev_attr_local_cpus.attr,
782 &dev_attr_local_cpulist.attr,
783 &dev_attr_modalias.attr,
784 #ifdef CONFIG_NUMA
785 &dev_attr_numa_node.attr,
786 #endif
787 &dev_attr_dma_mask_bits.attr,
788 &dev_attr_consistent_dma_mask_bits.attr,
789 &dev_attr_enable.attr,
790 &dev_attr_broken_parity_status.attr,
791 &dev_attr_msi_bus.attr,
792 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
793 &dev_attr_d3cold_allowed.attr,
794 #endif
795 #ifdef CONFIG_OF
796 &dev_attr_devspec.attr,
797 #endif
798 &dev_attr_driver_override.attr,
799 &dev_attr_ari_enabled.attr,
800 NULL,
801 };
802
803 static struct attribute *pci_bridge_attrs[] = {
804 &dev_attr_subordinate_bus_number.attr,
805 &dev_attr_secondary_bus_number.attr,
806 NULL,
807 };
808
809 static struct attribute *pcie_dev_attrs[] = {
810 &dev_attr_current_link_speed.attr,
811 &dev_attr_current_link_width.attr,
812 &dev_attr_max_link_width.attr,
813 &dev_attr_max_link_speed.attr,
814 NULL,
815 };
816
817 static struct attribute *pcibus_attrs[] = {
818 &dev_attr_rescan.attr,
819 &dev_attr_cpuaffinity.attr,
820 &dev_attr_cpulistaffinity.attr,
821 NULL,
822 };
823
824 static const struct attribute_group pcibus_group = {
825 .attrs = pcibus_attrs,
826 };
827
828 const struct attribute_group *pcibus_groups[] = {
829 &pcibus_group,
830 NULL,
831 };
832
833 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
834 char *buf)
835 {
836 struct pci_dev *pdev = to_pci_dev(dev);
837 struct pci_dev *vga_dev = vga_default_device();
838
839 if (vga_dev)
840 return sprintf(buf, "%u\n", (pdev == vga_dev));
841
842 return sprintf(buf, "%u\n",
843 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
844 IORESOURCE_ROM_SHADOW));
845 }
846 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
847
848 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
849 struct bin_attribute *bin_attr, char *buf,
850 loff_t off, size_t count)
851 {
852 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
853 unsigned int size = 64;
854 loff_t init_off = off;
855 u8 *data = (u8 *) buf;
856
857 /* Several chips lock up trying to read undefined config space */
858 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
859 size = dev->cfg_size;
860 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
861 size = 128;
862
863 if (off > size)
864 return 0;
865 if (off + count > size) {
866 size -= off;
867 count = size;
868 } else {
869 size = count;
870 }
871
872 pci_config_pm_runtime_get(dev);
873
874 if ((off & 1) && size) {
875 u8 val;
876 pci_user_read_config_byte(dev, off, &val);
877 data[off - init_off] = val;
878 off++;
879 size--;
880 }
881
882 if ((off & 3) && size > 2) {
883 u16 val;
884 pci_user_read_config_word(dev, off, &val);
885 data[off - init_off] = val & 0xff;
886 data[off - init_off + 1] = (val >> 8) & 0xff;
887 off += 2;
888 size -= 2;
889 }
890
891 while (size > 3) {
892 u32 val;
893 pci_user_read_config_dword(dev, off, &val);
894 data[off - init_off] = val & 0xff;
895 data[off - init_off + 1] = (val >> 8) & 0xff;
896 data[off - init_off + 2] = (val >> 16) & 0xff;
897 data[off - init_off + 3] = (val >> 24) & 0xff;
898 off += 4;
899 size -= 4;
900 }
901
902 if (size >= 2) {
903 u16 val;
904 pci_user_read_config_word(dev, off, &val);
905 data[off - init_off] = val & 0xff;
906 data[off - init_off + 1] = (val >> 8) & 0xff;
907 off += 2;
908 size -= 2;
909 }
910
911 if (size > 0) {
912 u8 val;
913 pci_user_read_config_byte(dev, off, &val);
914 data[off - init_off] = val;
915 off++;
916 --size;
917 }
918
919 pci_config_pm_runtime_put(dev);
920
921 return count;
922 }
923
924 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
925 struct bin_attribute *bin_attr, char *buf,
926 loff_t off, size_t count)
927 {
928 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
929 unsigned int size = count;
930 loff_t init_off = off;
931 u8 *data = (u8 *) buf;
932
933 if (off > dev->cfg_size)
934 return 0;
935 if (off + count > dev->cfg_size) {
936 size = dev->cfg_size - off;
937 count = size;
938 }
939
940 pci_config_pm_runtime_get(dev);
941
942 if ((off & 1) && size) {
943 pci_user_write_config_byte(dev, off, data[off - init_off]);
944 off++;
945 size--;
946 }
947
948 if ((off & 3) && size > 2) {
949 u16 val = data[off - init_off];
950 val |= (u16) data[off - init_off + 1] << 8;
951 pci_user_write_config_word(dev, off, val);
952 off += 2;
953 size -= 2;
954 }
955
956 while (size > 3) {
957 u32 val = data[off - init_off];
958 val |= (u32) data[off - init_off + 1] << 8;
959 val |= (u32) data[off - init_off + 2] << 16;
960 val |= (u32) data[off - init_off + 3] << 24;
961 pci_user_write_config_dword(dev, off, val);
962 off += 4;
963 size -= 4;
964 }
965
966 if (size >= 2) {
967 u16 val = data[off - init_off];
968 val |= (u16) data[off - init_off + 1] << 8;
969 pci_user_write_config_word(dev, off, val);
970 off += 2;
971 size -= 2;
972 }
973
974 if (size) {
975 pci_user_write_config_byte(dev, off, data[off - init_off]);
976 off++;
977 --size;
978 }
979
980 pci_config_pm_runtime_put(dev);
981
982 return count;
983 }
984
985 static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
986 struct bin_attribute *bin_attr, char *buf,
987 loff_t off, size_t count)
988 {
989 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
990
991 if (bin_attr->size > 0) {
992 if (off > bin_attr->size)
993 count = 0;
994 else if (count > bin_attr->size - off)
995 count = bin_attr->size - off;
996 }
997
998 return pci_read_vpd(dev, off, count, buf);
999 }
1000
1001 static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
1002 struct bin_attribute *bin_attr, char *buf,
1003 loff_t off, size_t count)
1004 {
1005 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
1006
1007 if (bin_attr->size > 0) {
1008 if (off > bin_attr->size)
1009 count = 0;
1010 else if (count > bin_attr->size - off)
1011 count = bin_attr->size - off;
1012 }
1013
1014 return pci_write_vpd(dev, off, count, buf);
1015 }
1016
1017 #ifdef HAVE_PCI_LEGACY
1018 /**
1019 * pci_read_legacy_io - read byte(s) from legacy I/O port space
1020 * @filp: open sysfs file
1021 * @kobj: kobject corresponding to file to read from
1022 * @bin_attr: struct bin_attribute for this file
1023 * @buf: buffer to store results
1024 * @off: offset into legacy I/O port space
1025 * @count: number of bytes to read
1026 *
1027 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
1028 * callback routine (pci_legacy_read).
1029 */
1030 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
1031 struct bin_attribute *bin_attr, char *buf,
1032 loff_t off, size_t count)
1033 {
1034 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1035
1036 /* Only support 1, 2 or 4 byte accesses */
1037 if (count != 1 && count != 2 && count != 4)
1038 return -EINVAL;
1039
1040 return pci_legacy_read(bus, off, (u32 *)buf, count);
1041 }
1042
1043 /**
1044 * pci_write_legacy_io - write byte(s) to legacy I/O port space
1045 * @filp: open sysfs file
1046 * @kobj: kobject corresponding to file to read from
1047 * @bin_attr: struct bin_attribute for this file
1048 * @buf: buffer containing value to be written
1049 * @off: offset into legacy I/O port space
1050 * @count: number of bytes to write
1051 *
1052 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
1053 * callback routine (pci_legacy_write).
1054 */
1055 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
1056 struct bin_attribute *bin_attr, char *buf,
1057 loff_t off, size_t count)
1058 {
1059 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1060
1061 /* Only support 1, 2 or 4 byte accesses */
1062 if (count != 1 && count != 2 && count != 4)
1063 return -EINVAL;
1064
1065 return pci_legacy_write(bus, off, *(u32 *)buf, count);
1066 }
1067
1068 /**
1069 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
1070 * @filp: open sysfs file
1071 * @kobj: kobject corresponding to device to be mapped
1072 * @attr: struct bin_attribute for this file
1073 * @vma: struct vm_area_struct passed to mmap
1074 *
1075 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
1076 * legacy memory space (first meg of bus space) into application virtual
1077 * memory space.
1078 */
1079 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
1080 struct bin_attribute *attr,
1081 struct vm_area_struct *vma)
1082 {
1083 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1084
1085 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
1086 }
1087
1088 /**
1089 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
1090 * @filp: open sysfs file
1091 * @kobj: kobject corresponding to device to be mapped
1092 * @attr: struct bin_attribute for this file
1093 * @vma: struct vm_area_struct passed to mmap
1094 *
1095 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
1096 * legacy IO space (first meg of bus space) into application virtual
1097 * memory space. Returns -ENOSYS if the operation isn't supported
1098 */
1099 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
1100 struct bin_attribute *attr,
1101 struct vm_area_struct *vma)
1102 {
1103 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1104
1105 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
1106 }
1107
1108 /**
1109 * pci_adjust_legacy_attr - adjustment of legacy file attributes
1110 * @b: bus to create files under
1111 * @mmap_type: I/O port or memory
1112 *
1113 * Stub implementation. Can be overridden by arch if necessary.
1114 */
1115 void __weak pci_adjust_legacy_attr(struct pci_bus *b,
1116 enum pci_mmap_state mmap_type)
1117 {
1118 }
1119
1120 /**
1121 * pci_create_legacy_files - create legacy I/O port and memory files
1122 * @b: bus to create files under
1123 *
1124 * Some platforms allow access to legacy I/O port and ISA memory space on
1125 * a per-bus basis. This routine creates the files and ties them into
1126 * their associated read, write and mmap files from pci-sysfs.c
1127 *
1128 * On error unwind, but don't propagate the error to the caller
1129 * as it is ok to set up the PCI bus without these files.
1130 */
1131 void pci_create_legacy_files(struct pci_bus *b)
1132 {
1133 int error;
1134
1135 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
1136 GFP_ATOMIC);
1137 if (!b->legacy_io)
1138 goto kzalloc_err;
1139
1140 sysfs_bin_attr_init(b->legacy_io);
1141 b->legacy_io->attr.name = "legacy_io";
1142 b->legacy_io->size = 0xffff;
1143 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
1144 b->legacy_io->read = pci_read_legacy_io;
1145 b->legacy_io->write = pci_write_legacy_io;
1146 b->legacy_io->mmap = pci_mmap_legacy_io;
1147 pci_adjust_legacy_attr(b, pci_mmap_io);
1148 error = device_create_bin_file(&b->dev, b->legacy_io);
1149 if (error)
1150 goto legacy_io_err;
1151
1152 /* Allocated above after the legacy_io struct */
1153 b->legacy_mem = b->legacy_io + 1;
1154 sysfs_bin_attr_init(b->legacy_mem);
1155 b->legacy_mem->attr.name = "legacy_mem";
1156 b->legacy_mem->size = 1024*1024;
1157 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
1158 b->legacy_mem->mmap = pci_mmap_legacy_mem;
1159 pci_adjust_legacy_attr(b, pci_mmap_mem);
1160 error = device_create_bin_file(&b->dev, b->legacy_mem);
1161 if (error)
1162 goto legacy_mem_err;
1163
1164 return;
1165
1166 legacy_mem_err:
1167 device_remove_bin_file(&b->dev, b->legacy_io);
1168 legacy_io_err:
1169 kfree(b->legacy_io);
1170 b->legacy_io = NULL;
1171 kzalloc_err:
1172 printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
1173 return;
1174 }
1175
1176 void pci_remove_legacy_files(struct pci_bus *b)
1177 {
1178 if (b->legacy_io) {
1179 device_remove_bin_file(&b->dev, b->legacy_io);
1180 device_remove_bin_file(&b->dev, b->legacy_mem);
1181 kfree(b->legacy_io); /* both are allocated here */
1182 }
1183 }
1184 #endif /* HAVE_PCI_LEGACY */
1185
1186 #if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
1187
1188 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
1189 enum pci_mmap_api mmap_api)
1190 {
1191 unsigned long nr, start, size;
1192 resource_size_t pci_start = 0, pci_end;
1193
1194 if (pci_resource_len(pdev, resno) == 0)
1195 return 0;
1196 nr = vma_pages(vma);
1197 start = vma->vm_pgoff;
1198 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
1199 if (mmap_api == PCI_MMAP_PROCFS) {
1200 pci_resource_to_user(pdev, resno, &pdev->resource[resno],
1201 &pci_start, &pci_end);
1202 pci_start >>= PAGE_SHIFT;
1203 }
1204 if (start >= pci_start && start < pci_start + size &&
1205 start + nr <= pci_start + size)
1206 return 1;
1207 return 0;
1208 }
1209
1210 /**
1211 * pci_mmap_resource - map a PCI resource into user memory space
1212 * @kobj: kobject for mapping
1213 * @attr: struct bin_attribute for the file being mapped
1214 * @vma: struct vm_area_struct passed into the mmap
1215 * @write_combine: 1 for write_combine mapping
1216 *
1217 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1218 */
1219 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1220 struct vm_area_struct *vma, int write_combine)
1221 {
1222 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1223 int bar = (unsigned long)attr->private;
1224 enum pci_mmap_state mmap_type;
1225 struct resource *res = &pdev->resource[bar];
1226
1227 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1228 return -EINVAL;
1229
1230 if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1231 return -EINVAL;
1232
1233 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1234
1235 return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1236 }
1237
1238 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1239 struct bin_attribute *attr,
1240 struct vm_area_struct *vma)
1241 {
1242 return pci_mmap_resource(kobj, attr, vma, 0);
1243 }
1244
1245 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1246 struct bin_attribute *attr,
1247 struct vm_area_struct *vma)
1248 {
1249 return pci_mmap_resource(kobj, attr, vma, 1);
1250 }
1251
1252 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1253 struct bin_attribute *attr, char *buf,
1254 loff_t off, size_t count, bool write)
1255 {
1256 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1257 int bar = (unsigned long)attr->private;
1258 unsigned long port = off;
1259
1260 port += pci_resource_start(pdev, bar);
1261
1262 if (port > pci_resource_end(pdev, bar))
1263 return 0;
1264
1265 if (port + count - 1 > pci_resource_end(pdev, bar))
1266 return -EINVAL;
1267
1268 switch (count) {
1269 case 1:
1270 if (write)
1271 outb(*(u8 *)buf, port);
1272 else
1273 *(u8 *)buf = inb(port);
1274 return 1;
1275 case 2:
1276 if (write)
1277 outw(*(u16 *)buf, port);
1278 else
1279 *(u16 *)buf = inw(port);
1280 return 2;
1281 case 4:
1282 if (write)
1283 outl(*(u32 *)buf, port);
1284 else
1285 *(u32 *)buf = inl(port);
1286 return 4;
1287 }
1288 return -EINVAL;
1289 }
1290
1291 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1292 struct bin_attribute *attr, char *buf,
1293 loff_t off, size_t count)
1294 {
1295 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1296 }
1297
1298 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1299 struct bin_attribute *attr, char *buf,
1300 loff_t off, size_t count)
1301 {
1302 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1303 }
1304
1305 /**
1306 * pci_remove_resource_files - cleanup resource files
1307 * @pdev: dev to cleanup
1308 *
1309 * If we created resource files for @pdev, remove them from sysfs and
1310 * free their resources.
1311 */
1312 static void pci_remove_resource_files(struct pci_dev *pdev)
1313 {
1314 int i;
1315
1316 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1317 struct bin_attribute *res_attr;
1318
1319 res_attr = pdev->res_attr[i];
1320 if (res_attr) {
1321 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1322 kfree(res_attr);
1323 }
1324
1325 res_attr = pdev->res_attr_wc[i];
1326 if (res_attr) {
1327 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1328 kfree(res_attr);
1329 }
1330 }
1331 }
1332
1333 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1334 {
1335 /* allocate attribute structure, piggyback attribute name */
1336 int name_len = write_combine ? 13 : 10;
1337 struct bin_attribute *res_attr;
1338 char *res_attr_name;
1339 int retval;
1340
1341 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1342 if (!res_attr)
1343 return -ENOMEM;
1344
1345 res_attr_name = (char *)(res_attr + 1);
1346
1347 sysfs_bin_attr_init(res_attr);
1348 if (write_combine) {
1349 pdev->res_attr_wc[num] = res_attr;
1350 sprintf(res_attr_name, "resource%d_wc", num);
1351 res_attr->mmap = pci_mmap_resource_wc;
1352 } else {
1353 pdev->res_attr[num] = res_attr;
1354 sprintf(res_attr_name, "resource%d", num);
1355 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1356 res_attr->read = pci_read_resource_io;
1357 res_attr->write = pci_write_resource_io;
1358 if (arch_can_pci_mmap_io())
1359 res_attr->mmap = pci_mmap_resource_uc;
1360 } else {
1361 res_attr->mmap = pci_mmap_resource_uc;
1362 }
1363 }
1364 res_attr->attr.name = res_attr_name;
1365 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1366 res_attr->size = pci_resource_len(pdev, num);
1367 res_attr->private = (void *)(unsigned long)num;
1368 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1369 if (retval)
1370 kfree(res_attr);
1371
1372 return retval;
1373 }
1374
1375 /**
1376 * pci_create_resource_files - create resource files in sysfs for @dev
1377 * @pdev: dev in question
1378 *
1379 * Walk the resources in @pdev creating files for each resource available.
1380 */
1381 static int pci_create_resource_files(struct pci_dev *pdev)
1382 {
1383 int i;
1384 int retval;
1385
1386 /* Expose the PCI resources from this device as files */
1387 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1388
1389 /* skip empty resources */
1390 if (!pci_resource_len(pdev, i))
1391 continue;
1392
1393 retval = pci_create_attr(pdev, i, 0);
1394 /* for prefetchable resources, create a WC mappable file */
1395 if (!retval && arch_can_pci_mmap_wc() &&
1396 pdev->resource[i].flags & IORESOURCE_PREFETCH)
1397 retval = pci_create_attr(pdev, i, 1);
1398 if (retval) {
1399 pci_remove_resource_files(pdev);
1400 return retval;
1401 }
1402 }
1403 return 0;
1404 }
1405 #else /* !HAVE_PCI_MMAP */
1406 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1407 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1408 #endif /* HAVE_PCI_MMAP */
1409
1410 /**
1411 * pci_write_rom - used to enable access to the PCI ROM display
1412 * @filp: sysfs file
1413 * @kobj: kernel object handle
1414 * @bin_attr: struct bin_attribute for this file
1415 * @buf: user input
1416 * @off: file offset
1417 * @count: number of byte in input
1418 *
1419 * writing anything except 0 enables it
1420 */
1421 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1422 struct bin_attribute *bin_attr, char *buf,
1423 loff_t off, size_t count)
1424 {
1425 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1426
1427 if ((off == 0) && (*buf == '0') && (count == 2))
1428 pdev->rom_attr_enabled = 0;
1429 else
1430 pdev->rom_attr_enabled = 1;
1431
1432 return count;
1433 }
1434
1435 /**
1436 * pci_read_rom - read a PCI ROM
1437 * @filp: sysfs file
1438 * @kobj: kernel object handle
1439 * @bin_attr: struct bin_attribute for this file
1440 * @buf: where to put the data we read from the ROM
1441 * @off: file offset
1442 * @count: number of bytes to read
1443 *
1444 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1445 * device corresponding to @kobj.
1446 */
1447 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1448 struct bin_attribute *bin_attr, char *buf,
1449 loff_t off, size_t count)
1450 {
1451 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1452 void __iomem *rom;
1453 size_t size;
1454
1455 if (!pdev->rom_attr_enabled)
1456 return -EINVAL;
1457
1458 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1459 if (!rom || !size)
1460 return -EIO;
1461
1462 if (off >= size)
1463 count = 0;
1464 else {
1465 if (off + count > size)
1466 count = size - off;
1467
1468 memcpy_fromio(buf, rom + off, count);
1469 }
1470 pci_unmap_rom(pdev, rom);
1471
1472 return count;
1473 }
1474
1475 static const struct bin_attribute pci_config_attr = {
1476 .attr = {
1477 .name = "config",
1478 .mode = S_IRUGO | S_IWUSR,
1479 },
1480 .size = PCI_CFG_SPACE_SIZE,
1481 .read = pci_read_config,
1482 .write = pci_write_config,
1483 };
1484
1485 static const struct bin_attribute pcie_config_attr = {
1486 .attr = {
1487 .name = "config",
1488 .mode = S_IRUGO | S_IWUSR,
1489 },
1490 .size = PCI_CFG_SPACE_EXP_SIZE,
1491 .read = pci_read_config,
1492 .write = pci_write_config,
1493 };
1494
1495 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1496 const char *buf, size_t count)
1497 {
1498 struct pci_dev *pdev = to_pci_dev(dev);
1499 unsigned long val;
1500 ssize_t result = kstrtoul(buf, 0, &val);
1501
1502 if (result < 0)
1503 return result;
1504
1505 if (val != 1)
1506 return -EINVAL;
1507
1508 result = pci_reset_function(pdev);
1509 if (result < 0)
1510 return result;
1511
1512 return count;
1513 }
1514
1515 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1516
1517 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1518 {
1519 int retval;
1520 struct bin_attribute *attr;
1521
1522 /* If the device has VPD, try to expose it in sysfs. */
1523 if (dev->vpd) {
1524 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1525 if (!attr)
1526 return -ENOMEM;
1527
1528 sysfs_bin_attr_init(attr);
1529 attr->size = 0;
1530 attr->attr.name = "vpd";
1531 attr->attr.mode = S_IRUSR | S_IWUSR;
1532 attr->read = read_vpd_attr;
1533 attr->write = write_vpd_attr;
1534 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1535 if (retval) {
1536 kfree(attr);
1537 return retval;
1538 }
1539 dev->vpd->attr = attr;
1540 }
1541
1542 /* Active State Power Management */
1543 pcie_aspm_create_sysfs_dev_files(dev);
1544
1545 if (!pci_probe_reset_function(dev)) {
1546 retval = device_create_file(&dev->dev, &reset_attr);
1547 if (retval)
1548 goto error;
1549 dev->reset_fn = 1;
1550 }
1551 return 0;
1552
1553 error:
1554 pcie_aspm_remove_sysfs_dev_files(dev);
1555 if (dev->vpd && dev->vpd->attr) {
1556 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1557 kfree(dev->vpd->attr);
1558 }
1559
1560 return retval;
1561 }
1562
1563 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1564 {
1565 int retval;
1566 int rom_size;
1567 struct bin_attribute *attr;
1568
1569 if (!sysfs_initialized)
1570 return -EACCES;
1571
1572 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1573 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1574 else
1575 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1576 if (retval)
1577 goto err;
1578
1579 retval = pci_create_resource_files(pdev);
1580 if (retval)
1581 goto err_config_file;
1582
1583 /* If the device has a ROM, try to expose it in sysfs. */
1584 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1585 if (rom_size) {
1586 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1587 if (!attr) {
1588 retval = -ENOMEM;
1589 goto err_resource_files;
1590 }
1591 sysfs_bin_attr_init(attr);
1592 attr->size = rom_size;
1593 attr->attr.name = "rom";
1594 attr->attr.mode = S_IRUSR | S_IWUSR;
1595 attr->read = pci_read_rom;
1596 attr->write = pci_write_rom;
1597 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1598 if (retval) {
1599 kfree(attr);
1600 goto err_resource_files;
1601 }
1602 pdev->rom_attr = attr;
1603 }
1604
1605 /* add sysfs entries for various capabilities */
1606 retval = pci_create_capabilities_sysfs(pdev);
1607 if (retval)
1608 goto err_rom_file;
1609
1610 pci_create_firmware_label_files(pdev);
1611
1612 return 0;
1613
1614 err_rom_file:
1615 if (pdev->rom_attr) {
1616 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1617 kfree(pdev->rom_attr);
1618 pdev->rom_attr = NULL;
1619 }
1620 err_resource_files:
1621 pci_remove_resource_files(pdev);
1622 err_config_file:
1623 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1624 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1625 else
1626 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1627 err:
1628 return retval;
1629 }
1630
1631 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1632 {
1633 if (dev->vpd && dev->vpd->attr) {
1634 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1635 kfree(dev->vpd->attr);
1636 }
1637
1638 pcie_aspm_remove_sysfs_dev_files(dev);
1639 if (dev->reset_fn) {
1640 device_remove_file(&dev->dev, &reset_attr);
1641 dev->reset_fn = 0;
1642 }
1643 }
1644
1645 /**
1646 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1647 * @pdev: device whose entries we should free
1648 *
1649 * Cleanup when @pdev is removed from sysfs.
1650 */
1651 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1652 {
1653 if (!sysfs_initialized)
1654 return;
1655
1656 pci_remove_capabilities_sysfs(pdev);
1657
1658 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1659 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1660 else
1661 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1662
1663 pci_remove_resource_files(pdev);
1664
1665 if (pdev->rom_attr) {
1666 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1667 kfree(pdev->rom_attr);
1668 pdev->rom_attr = NULL;
1669 }
1670
1671 pci_remove_firmware_label_files(pdev);
1672 }
1673
1674 static int __init pci_sysfs_init(void)
1675 {
1676 struct pci_dev *pdev = NULL;
1677 int retval;
1678
1679 sysfs_initialized = 1;
1680 for_each_pci_dev(pdev) {
1681 retval = pci_create_sysfs_dev_files(pdev);
1682 if (retval) {
1683 pci_dev_put(pdev);
1684 return retval;
1685 }
1686 }
1687
1688 return 0;
1689 }
1690 late_initcall(pci_sysfs_init);
1691
1692 static struct attribute *pci_dev_dev_attrs[] = {
1693 &vga_attr.attr,
1694 NULL,
1695 };
1696
1697 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1698 struct attribute *a, int n)
1699 {
1700 struct device *dev = kobj_to_dev(kobj);
1701 struct pci_dev *pdev = to_pci_dev(dev);
1702
1703 if (a == &vga_attr.attr)
1704 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1705 return 0;
1706
1707 return a->mode;
1708 }
1709
1710 static struct attribute *pci_dev_hp_attrs[] = {
1711 &dev_remove_attr.attr,
1712 &dev_rescan_attr.attr,
1713 NULL,
1714 };
1715
1716 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1717 struct attribute *a, int n)
1718 {
1719 struct device *dev = kobj_to_dev(kobj);
1720 struct pci_dev *pdev = to_pci_dev(dev);
1721
1722 if (pdev->is_virtfn)
1723 return 0;
1724
1725 return a->mode;
1726 }
1727
1728 static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1729 struct attribute *a, int n)
1730 {
1731 struct device *dev = kobj_to_dev(kobj);
1732 struct pci_dev *pdev = to_pci_dev(dev);
1733
1734 if (pci_is_bridge(pdev))
1735 return a->mode;
1736
1737 return 0;
1738 }
1739
1740 static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1741 struct attribute *a, int n)
1742 {
1743 struct device *dev = kobj_to_dev(kobj);
1744 struct pci_dev *pdev = to_pci_dev(dev);
1745
1746 if (pci_is_pcie(pdev))
1747 return a->mode;
1748
1749 return 0;
1750 }
1751
1752 static const struct attribute_group pci_dev_group = {
1753 .attrs = pci_dev_attrs,
1754 };
1755
1756 const struct attribute_group *pci_dev_groups[] = {
1757 &pci_dev_group,
1758 NULL,
1759 };
1760
1761 static const struct attribute_group pci_bridge_group = {
1762 .attrs = pci_bridge_attrs,
1763 };
1764
1765 const struct attribute_group *pci_bridge_groups[] = {
1766 &pci_bridge_group,
1767 NULL,
1768 };
1769
1770 static const struct attribute_group pcie_dev_group = {
1771 .attrs = pcie_dev_attrs,
1772 };
1773
1774 const struct attribute_group *pcie_dev_groups[] = {
1775 &pcie_dev_group,
1776 NULL,
1777 };
1778
1779 static const struct attribute_group pci_dev_hp_attr_group = {
1780 .attrs = pci_dev_hp_attrs,
1781 .is_visible = pci_dev_hp_attrs_are_visible,
1782 };
1783
1784 #ifdef CONFIG_PCI_IOV
1785 static struct attribute *sriov_dev_attrs[] = {
1786 &sriov_totalvfs_attr.attr,
1787 &sriov_numvfs_attr.attr,
1788 &sriov_offset_attr.attr,
1789 &sriov_stride_attr.attr,
1790 &sriov_vf_device_attr.attr,
1791 &sriov_drivers_autoprobe_attr.attr,
1792 NULL,
1793 };
1794
1795 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1796 struct attribute *a, int n)
1797 {
1798 struct device *dev = kobj_to_dev(kobj);
1799
1800 if (!dev_is_pf(dev))
1801 return 0;
1802
1803 return a->mode;
1804 }
1805
1806 static const struct attribute_group sriov_dev_attr_group = {
1807 .attrs = sriov_dev_attrs,
1808 .is_visible = sriov_attrs_are_visible,
1809 };
1810 #endif /* CONFIG_PCI_IOV */
1811
1812 static const struct attribute_group pci_dev_attr_group = {
1813 .attrs = pci_dev_dev_attrs,
1814 .is_visible = pci_dev_attrs_are_visible,
1815 };
1816
1817 static const struct attribute_group pci_bridge_attr_group = {
1818 .attrs = pci_bridge_attrs,
1819 .is_visible = pci_bridge_attrs_are_visible,
1820 };
1821
1822 static const struct attribute_group pcie_dev_attr_group = {
1823 .attrs = pcie_dev_attrs,
1824 .is_visible = pcie_dev_attrs_are_visible,
1825 };
1826
1827 static const struct attribute_group *pci_dev_attr_groups[] = {
1828 &pci_dev_attr_group,
1829 &pci_dev_hp_attr_group,
1830 #ifdef CONFIG_PCI_IOV
1831 &sriov_dev_attr_group,
1832 #endif
1833 &pci_bridge_attr_group,
1834 &pcie_dev_attr_group,
1835 NULL,
1836 };
1837
1838 const struct device_type pci_dev_type = {
1839 .groups = pci_dev_attr_groups,
1840 };
Linux with added FPC-III support