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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
4 * (C) Copyright 2002-2004 IBM Corp.
5 * (C) Copyright 2003 Matthew Wilcox
6 * (C) Copyright 2003 Hewlett-Packard
7 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
8 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
9 *
10 * File attributes for PCI devices
11 *
12 * Modeled after usb's driverfs.c
13 */
14
15
16#include <linux/kernel.h>
17#include <linux/sched.h>
18#include <linux/pci.h>
19#include <linux/stat.h>
20#include <linux/export.h>
21#include <linux/topology.h>
22#include <linux/mm.h>
23#include <linux/fs.h>
24#include <linux/capability.h>
25#include <linux/security.h>
26#include <linux/slab.h>
27#include <linux/vgaarb.h>
28#include <linux/pm_runtime.h>
29#include <linux/of.h>
30#include "pci.h"
31
32static int sysfs_initialized; /* = 0 */
33
34/* show configuration fields */
35#define pci_config_attr(field, format_string) \
36static ssize_t \
37field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
38{ \
39 struct pci_dev *pdev; \
40 \
41 pdev = to_pci_dev(dev); \
42 return sprintf(buf, format_string, pdev->field); \
43} \
44static DEVICE_ATTR_RO(field)
45
46pci_config_attr(vendor, "0x%04x\n");
47pci_config_attr(device, "0x%04x\n");
48pci_config_attr(subsystem_vendor, "0x%04x\n");
49pci_config_attr(subsystem_device, "0x%04x\n");
50pci_config_attr(revision, "0x%02x\n");
51pci_config_attr(class, "0x%06x\n");
52pci_config_attr(irq, "%u\n");
53
54static ssize_t broken_parity_status_show(struct device *dev,
55 struct device_attribute *attr,
56 char *buf)
57{
58 struct pci_dev *pdev = to_pci_dev(dev);
59 return sprintf(buf, "%u\n", pdev->broken_parity_status);
60}
61
62static ssize_t broken_parity_status_store(struct device *dev,
63 struct device_attribute *attr,
64 const char *buf, size_t count)
65{
66 struct pci_dev *pdev = to_pci_dev(dev);
67 unsigned long val;
68
69 if (kstrtoul(buf, 0, &val) < 0)
70 return -EINVAL;
71
72 pdev->broken_parity_status = !!val;
73
74 return count;
75}
76static DEVICE_ATTR_RW(broken_parity_status);
77
78static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
79 struct device_attribute *attr, char *buf)
80{
81 const struct cpumask *mask;
82
83#ifdef CONFIG_NUMA
84 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
85 cpumask_of_node(dev_to_node(dev));
86#else
87 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
88#endif
89 return cpumap_print_to_pagebuf(list, buf, mask);
90}
91
92static ssize_t local_cpus_show(struct device *dev,
93 struct device_attribute *attr, char *buf)
94{
95 return pci_dev_show_local_cpu(dev, false, attr, buf);
96}
97static DEVICE_ATTR_RO(local_cpus);
98
99static ssize_t local_cpulist_show(struct device *dev,
100 struct device_attribute *attr, char *buf)
101{
102 return pci_dev_show_local_cpu(dev, true, attr, buf);
103}
104static DEVICE_ATTR_RO(local_cpulist);
105
106/*
107 * PCI Bus Class Devices
108 */
109static ssize_t cpuaffinity_show(struct device *dev,
110 struct device_attribute *attr, char *buf)
111{
112 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
113
114 return cpumap_print_to_pagebuf(false, buf, cpumask);
115}
116static DEVICE_ATTR_RO(cpuaffinity);
117
118static ssize_t cpulistaffinity_show(struct device *dev,
119 struct device_attribute *attr, char *buf)
120{
121 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
122
123 return cpumap_print_to_pagebuf(true, buf, cpumask);
124}
125static DEVICE_ATTR_RO(cpulistaffinity);
126
127/* show resources */
128static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
129 char *buf)
130{
131 struct pci_dev *pci_dev = to_pci_dev(dev);
132 char *str = buf;
133 int i;
134 int max;
135 resource_size_t start, end;
136
137 if (pci_dev->subordinate)
138 max = DEVICE_COUNT_RESOURCE;
139 else
140 max = PCI_BRIDGE_RESOURCES;
141
142 for (i = 0; i < max; i++) {
143 struct resource *res = &pci_dev->resource[i];
144 pci_resource_to_user(pci_dev, i, res, &start, &end);
145 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
146 (unsigned long long)start,
147 (unsigned long long)end,
148 (unsigned long long)res->flags);
149 }
150 return (str - buf);
151}
152static DEVICE_ATTR_RO(resource);
153
154static ssize_t max_link_speed_show(struct device *dev,
155 struct device_attribute *attr, char *buf)
156{
157 struct pci_dev *pdev = to_pci_dev(dev);
158
159 return sprintf(buf, "%s\n", PCIE_SPEED2STR(pcie_get_speed_cap(pdev)));
160}
161static DEVICE_ATTR_RO(max_link_speed);
162
163static ssize_t max_link_width_show(struct device *dev,
164 struct device_attribute *attr, char *buf)
165{
166 struct pci_dev *pdev = to_pci_dev(dev);
167
168 return sprintf(buf, "%u\n", pcie_get_width_cap(pdev));
169}
170static DEVICE_ATTR_RO(max_link_width);
171
172static ssize_t current_link_speed_show(struct device *dev,
173 struct device_attribute *attr, char *buf)
174{
175 struct pci_dev *pci_dev = to_pci_dev(dev);
176 u16 linkstat;
177 int err;
178 const char *speed;
179
180 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
181 if (err)
182 return -EINVAL;
183
184 switch (linkstat & PCI_EXP_LNKSTA_CLS) {
185 case PCI_EXP_LNKSTA_CLS_32_0GB:
186 speed = "32 GT/s";
187 break;
188 case PCI_EXP_LNKSTA_CLS_16_0GB:
189 speed = "16 GT/s";
190 break;
191 case PCI_EXP_LNKSTA_CLS_8_0GB:
192 speed = "8 GT/s";
193 break;
194 case PCI_EXP_LNKSTA_CLS_5_0GB:
195 speed = "5 GT/s";
196 break;
197 case PCI_EXP_LNKSTA_CLS_2_5GB:
198 speed = "2.5 GT/s";
199 break;
200 default:
201 speed = "Unknown speed";
202 }
203
204 return sprintf(buf, "%s\n", speed);
205}
206static DEVICE_ATTR_RO(current_link_speed);
207
208static ssize_t current_link_width_show(struct device *dev,
209 struct device_attribute *attr, char *buf)
210{
211 struct pci_dev *pci_dev = to_pci_dev(dev);
212 u16 linkstat;
213 int err;
214
215 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
216 if (err)
217 return -EINVAL;
218
219 return sprintf(buf, "%u\n",
220 (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
221}
222static DEVICE_ATTR_RO(current_link_width);
223
224static ssize_t secondary_bus_number_show(struct device *dev,
225 struct device_attribute *attr,
226 char *buf)
227{
228 struct pci_dev *pci_dev = to_pci_dev(dev);
229 u8 sec_bus;
230 int err;
231
232 err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
233 if (err)
234 return -EINVAL;
235
236 return sprintf(buf, "%u\n", sec_bus);
237}
238static DEVICE_ATTR_RO(secondary_bus_number);
239
240static ssize_t subordinate_bus_number_show(struct device *dev,
241 struct device_attribute *attr,
242 char *buf)
243{
244 struct pci_dev *pci_dev = to_pci_dev(dev);
245 u8 sub_bus;
246 int err;
247
248 err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
249 if (err)
250 return -EINVAL;
251
252 return sprintf(buf, "%u\n", sub_bus);
253}
254static DEVICE_ATTR_RO(subordinate_bus_number);
255
256static ssize_t ari_enabled_show(struct device *dev,
257 struct device_attribute *attr,
258 char *buf)
259{
260 struct pci_dev *pci_dev = to_pci_dev(dev);
261
262 return sprintf(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
263}
264static DEVICE_ATTR_RO(ari_enabled);
265
266static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
267 char *buf)
268{
269 struct pci_dev *pci_dev = to_pci_dev(dev);
270
271 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
272 pci_dev->vendor, pci_dev->device,
273 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
274 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
275 (u8)(pci_dev->class));
276}
277static DEVICE_ATTR_RO(modalias);
278
279static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
280 const char *buf, size_t count)
281{
282 struct pci_dev *pdev = to_pci_dev(dev);
283 unsigned long val;
284 ssize_t result = kstrtoul(buf, 0, &val);
285
286 if (result < 0)
287 return result;
288
289 /* this can crash the machine when done on the "wrong" device */
290 if (!capable(CAP_SYS_ADMIN))
291 return -EPERM;
292
293 device_lock(dev);
294 if (dev->driver)
295 result = -EBUSY;
296 else if (val)
297 result = pci_enable_device(pdev);
298 else if (pci_is_enabled(pdev))
299 pci_disable_device(pdev);
300 else
301 result = -EIO;
302 device_unlock(dev);
303
304 return result < 0 ? result : count;
305}
306
307static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
308 char *buf)
309{
310 struct pci_dev *pdev;
311
312 pdev = to_pci_dev(dev);
313 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
314}
315static DEVICE_ATTR_RW(enable);
316
317#ifdef CONFIG_NUMA
318static ssize_t numa_node_store(struct device *dev,
319 struct device_attribute *attr, const char *buf,
320 size_t count)
321{
322 struct pci_dev *pdev = to_pci_dev(dev);
323 int node, ret;
324
325 if (!capable(CAP_SYS_ADMIN))
326 return -EPERM;
327
328 ret = kstrtoint(buf, 0, &node);
329 if (ret)
330 return ret;
331
332 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
333 return -EINVAL;
334
335 if (node != NUMA_NO_NODE && !node_online(node))
336 return -EINVAL;
337
338 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
339 pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
340 node);
341
342 dev->numa_node = node;
343 return count;
344}
345
346static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
347 char *buf)
348{
349 return sprintf(buf, "%d\n", dev->numa_node);
350}
351static DEVICE_ATTR_RW(numa_node);
352#endif
353
354static ssize_t dma_mask_bits_show(struct device *dev,
355 struct device_attribute *attr, char *buf)
356{
357 struct pci_dev *pdev = to_pci_dev(dev);
358
359 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
360}
361static DEVICE_ATTR_RO(dma_mask_bits);
362
363static ssize_t consistent_dma_mask_bits_show(struct device *dev,
364 struct device_attribute *attr,
365 char *buf)
366{
367 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
368}
369static DEVICE_ATTR_RO(consistent_dma_mask_bits);
370
371static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
372 char *buf)
373{
374 struct pci_dev *pdev = to_pci_dev(dev);
375 struct pci_bus *subordinate = pdev->subordinate;
376
377 return sprintf(buf, "%u\n", subordinate ?
378 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
379 : !pdev->no_msi);
380}
381
382static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
383 const char *buf, size_t count)
384{
385 struct pci_dev *pdev = to_pci_dev(dev);
386 struct pci_bus *subordinate = pdev->subordinate;
387 unsigned long val;
388
389 if (kstrtoul(buf, 0, &val) < 0)
390 return -EINVAL;
391
392 if (!capable(CAP_SYS_ADMIN))
393 return -EPERM;
394
395 /*
396 * "no_msi" and "bus_flags" only affect what happens when a driver
397 * requests MSI or MSI-X. They don't affect any drivers that have
398 * already requested MSI or MSI-X.
399 */
400 if (!subordinate) {
401 pdev->no_msi = !val;
402 pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
403 val ? "allowed" : "disallowed");
404 return count;
405 }
406
407 if (val)
408 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
409 else
410 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
411
412 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
413 val ? "allowed" : "disallowed");
414 return count;
415}
416static DEVICE_ATTR_RW(msi_bus);
417
418static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count)
419{
420 unsigned long val;
421 struct pci_bus *b = NULL;
422
423 if (kstrtoul(buf, 0, &val) < 0)
424 return -EINVAL;
425
426 if (val) {
427 pci_lock_rescan_remove();
428 while ((b = pci_find_next_bus(b)) != NULL)
429 pci_rescan_bus(b);
430 pci_unlock_rescan_remove();
431 }
432 return count;
433}
434static BUS_ATTR_WO(rescan);
435
436static struct attribute *pci_bus_attrs[] = {
437 &bus_attr_rescan.attr,
438 NULL,
439};
440
441static const struct attribute_group pci_bus_group = {
442 .attrs = pci_bus_attrs,
443};
444
445const struct attribute_group *pci_bus_groups[] = {
446 &pci_bus_group,
447 NULL,
448};
449
450static ssize_t dev_rescan_store(struct device *dev,
451 struct device_attribute *attr, const char *buf,
452 size_t count)
453{
454 unsigned long val;
455 struct pci_dev *pdev = to_pci_dev(dev);
456
457 if (kstrtoul(buf, 0, &val) < 0)
458 return -EINVAL;
459
460 if (val) {
461 pci_lock_rescan_remove();
462 pci_rescan_bus(pdev->bus);
463 pci_unlock_rescan_remove();
464 }
465 return count;
466}
467static DEVICE_ATTR_WO(dev_rescan);
468
469static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
470 const char *buf, size_t count)
471{
472 unsigned long val;
473
474 if (kstrtoul(buf, 0, &val) < 0)
475 return -EINVAL;
476
477 if (val && device_remove_file_self(dev, attr))
478 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
479 return count;
480}
481static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0220, NULL,
482 remove_store);
483
484static ssize_t bus_rescan_store(struct device *dev,
485 struct device_attribute *attr,
486 const char *buf, size_t count)
487{
488 unsigned long val;
489 struct pci_bus *bus = to_pci_bus(dev);
490
491 if (kstrtoul(buf, 0, &val) < 0)
492 return -EINVAL;
493
494 if (val) {
495 pci_lock_rescan_remove();
496 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
497 pci_rescan_bus_bridge_resize(bus->self);
498 else
499 pci_rescan_bus(bus);
500 pci_unlock_rescan_remove();
501 }
502 return count;
503}
504static DEVICE_ATTR_WO(bus_rescan);
505
506#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
507static ssize_t d3cold_allowed_store(struct device *dev,
508 struct device_attribute *attr,
509 const char *buf, size_t count)
510{
511 struct pci_dev *pdev = to_pci_dev(dev);
512 unsigned long val;
513
514 if (kstrtoul(buf, 0, &val) < 0)
515 return -EINVAL;
516
517 pdev->d3cold_allowed = !!val;
518 if (pdev->d3cold_allowed)
519 pci_d3cold_enable(pdev);
520 else
521 pci_d3cold_disable(pdev);
522
523 pm_runtime_resume(dev);
524
525 return count;
526}
527
528static ssize_t d3cold_allowed_show(struct device *dev,
529 struct device_attribute *attr, char *buf)
530{
531 struct pci_dev *pdev = to_pci_dev(dev);
532 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
533}
534static DEVICE_ATTR_RW(d3cold_allowed);
535#endif
536
537#ifdef CONFIG_OF
538static ssize_t devspec_show(struct device *dev,
539 struct device_attribute *attr, char *buf)
540{
541 struct pci_dev *pdev = to_pci_dev(dev);
542 struct device_node *np = pci_device_to_OF_node(pdev);
543
544 if (np == NULL)
545 return 0;
546 return sprintf(buf, "%pOF", np);
547}
548static DEVICE_ATTR_RO(devspec);
549#endif
550
551static ssize_t driver_override_store(struct device *dev,
552 struct device_attribute *attr,
553 const char *buf, size_t count)
554{
555 struct pci_dev *pdev = to_pci_dev(dev);
556 char *driver_override, *old, *cp;
557
558 /* We need to keep extra room for a newline */
559 if (count >= (PAGE_SIZE - 1))
560 return -EINVAL;
561
562 driver_override = kstrndup(buf, count, GFP_KERNEL);
563 if (!driver_override)
564 return -ENOMEM;
565
566 cp = strchr(driver_override, '\n');
567 if (cp)
568 *cp = '\0';
569
570 device_lock(dev);
571 old = pdev->driver_override;
572 if (strlen(driver_override)) {
573 pdev->driver_override = driver_override;
574 } else {
575 kfree(driver_override);
576 pdev->driver_override = NULL;
577 }
578 device_unlock(dev);
579
580 kfree(old);
581
582 return count;
583}
584
585static ssize_t driver_override_show(struct device *dev,
586 struct device_attribute *attr, char *buf)
587{
588 struct pci_dev *pdev = to_pci_dev(dev);
589 ssize_t len;
590
591 device_lock(dev);
592 len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
593 device_unlock(dev);
594 return len;
595}
596static DEVICE_ATTR_RW(driver_override);
597
598static struct attribute *pci_dev_attrs[] = {
599 &dev_attr_resource.attr,
600 &dev_attr_vendor.attr,
601 &dev_attr_device.attr,
602 &dev_attr_subsystem_vendor.attr,
603 &dev_attr_subsystem_device.attr,
604 &dev_attr_revision.attr,
605 &dev_attr_class.attr,
606 &dev_attr_irq.attr,
607 &dev_attr_local_cpus.attr,
608 &dev_attr_local_cpulist.attr,
609 &dev_attr_modalias.attr,
610#ifdef CONFIG_NUMA
611 &dev_attr_numa_node.attr,
612#endif
613 &dev_attr_dma_mask_bits.attr,
614 &dev_attr_consistent_dma_mask_bits.attr,
615 &dev_attr_enable.attr,
616 &dev_attr_broken_parity_status.attr,
617 &dev_attr_msi_bus.attr,
618#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
619 &dev_attr_d3cold_allowed.attr,
620#endif
621#ifdef CONFIG_OF
622 &dev_attr_devspec.attr,
623#endif
624 &dev_attr_driver_override.attr,
625 &dev_attr_ari_enabled.attr,
626 NULL,
627};
628
629static struct attribute *pci_bridge_attrs[] = {
630 &dev_attr_subordinate_bus_number.attr,
631 &dev_attr_secondary_bus_number.attr,
632 NULL,
633};
634
635static struct attribute *pcie_dev_attrs[] = {
636 &dev_attr_current_link_speed.attr,
637 &dev_attr_current_link_width.attr,
638 &dev_attr_max_link_width.attr,
639 &dev_attr_max_link_speed.attr,
640 NULL,
641};
642
643static struct attribute *pcibus_attrs[] = {
644 &dev_attr_bus_rescan.attr,
645 &dev_attr_cpuaffinity.attr,
646 &dev_attr_cpulistaffinity.attr,
647 NULL,
648};
649
650static const struct attribute_group pcibus_group = {
651 .attrs = pcibus_attrs,
652};
653
654const struct attribute_group *pcibus_groups[] = {
655 &pcibus_group,
656 NULL,
657};
658
659static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
660 char *buf)
661{
662 struct pci_dev *pdev = to_pci_dev(dev);
663 struct pci_dev *vga_dev = vga_default_device();
664
665 if (vga_dev)
666 return sprintf(buf, "%u\n", (pdev == vga_dev));
667
668 return sprintf(buf, "%u\n",
669 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
670 IORESOURCE_ROM_SHADOW));
671}
672static DEVICE_ATTR_RO(boot_vga);
673
674static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
675 struct bin_attribute *bin_attr, char *buf,
676 loff_t off, size_t count)
677{
678 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
679 unsigned int size = 64;
680 loff_t init_off = off;
681 u8 *data = (u8 *) buf;
682
683 /* Several chips lock up trying to read undefined config space */
684 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
685 size = dev->cfg_size;
686 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
687 size = 128;
688
689 if (off > size)
690 return 0;
691 if (off + count > size) {
692 size -= off;
693 count = size;
694 } else {
695 size = count;
696 }
697
698 pci_config_pm_runtime_get(dev);
699
700 if ((off & 1) && size) {
701 u8 val;
702 pci_user_read_config_byte(dev, off, &val);
703 data[off - init_off] = val;
704 off++;
705 size--;
706 }
707
708 if ((off & 3) && size > 2) {
709 u16 val;
710 pci_user_read_config_word(dev, off, &val);
711 data[off - init_off] = val & 0xff;
712 data[off - init_off + 1] = (val >> 8) & 0xff;
713 off += 2;
714 size -= 2;
715 }
716
717 while (size > 3) {
718 u32 val;
719 pci_user_read_config_dword(dev, off, &val);
720 data[off - init_off] = val & 0xff;
721 data[off - init_off + 1] = (val >> 8) & 0xff;
722 data[off - init_off + 2] = (val >> 16) & 0xff;
723 data[off - init_off + 3] = (val >> 24) & 0xff;
724 off += 4;
725 size -= 4;
726 }
727
728 if (size >= 2) {
729 u16 val;
730 pci_user_read_config_word(dev, off, &val);
731 data[off - init_off] = val & 0xff;
732 data[off - init_off + 1] = (val >> 8) & 0xff;
733 off += 2;
734 size -= 2;
735 }
736
737 if (size > 0) {
738 u8 val;
739 pci_user_read_config_byte(dev, off, &val);
740 data[off - init_off] = val;
741 off++;
742 --size;
743 }
744
745 pci_config_pm_runtime_put(dev);
746
747 return count;
748}
749
750static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
751 struct bin_attribute *bin_attr, char *buf,
752 loff_t off, size_t count)
753{
754 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
755 unsigned int size = count;
756 loff_t init_off = off;
757 u8 *data = (u8 *) buf;
758 int ret;
759
760 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
761 if (ret)
762 return ret;
763
764 if (off > dev->cfg_size)
765 return 0;
766 if (off + count > dev->cfg_size) {
767 size = dev->cfg_size - off;
768 count = size;
769 }
770
771 pci_config_pm_runtime_get(dev);
772
773 if ((off & 1) && size) {
774 pci_user_write_config_byte(dev, off, data[off - init_off]);
775 off++;
776 size--;
777 }
778
779 if ((off & 3) && size > 2) {
780 u16 val = data[off - init_off];
781 val |= (u16) data[off - init_off + 1] << 8;
782 pci_user_write_config_word(dev, off, val);
783 off += 2;
784 size -= 2;
785 }
786
787 while (size > 3) {
788 u32 val = data[off - init_off];
789 val |= (u32) data[off - init_off + 1] << 8;
790 val |= (u32) data[off - init_off + 2] << 16;
791 val |= (u32) data[off - init_off + 3] << 24;
792 pci_user_write_config_dword(dev, off, val);
793 off += 4;
794 size -= 4;
795 }
796
797 if (size >= 2) {
798 u16 val = data[off - init_off];
799 val |= (u16) data[off - init_off + 1] << 8;
800 pci_user_write_config_word(dev, off, val);
801 off += 2;
802 size -= 2;
803 }
804
805 if (size) {
806 pci_user_write_config_byte(dev, off, data[off - init_off]);
807 off++;
808 --size;
809 }
810
811 pci_config_pm_runtime_put(dev);
812
813 return count;
814}
815
816#ifdef HAVE_PCI_LEGACY
817/**
818 * pci_read_legacy_io - read byte(s) from legacy I/O port space
819 * @filp: open sysfs file
820 * @kobj: kobject corresponding to file to read from
821 * @bin_attr: struct bin_attribute for this file
822 * @buf: buffer to store results
823 * @off: offset into legacy I/O port space
824 * @count: number of bytes to read
825 *
826 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
827 * callback routine (pci_legacy_read).
828 */
829static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
830 struct bin_attribute *bin_attr, char *buf,
831 loff_t off, size_t count)
832{
833 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
834
835 /* Only support 1, 2 or 4 byte accesses */
836 if (count != 1 && count != 2 && count != 4)
837 return -EINVAL;
838
839 return pci_legacy_read(bus, off, (u32 *)buf, count);
840}
841
842/**
843 * pci_write_legacy_io - write byte(s) to legacy I/O port space
844 * @filp: open sysfs file
845 * @kobj: kobject corresponding to file to read from
846 * @bin_attr: struct bin_attribute for this file
847 * @buf: buffer containing value to be written
848 * @off: offset into legacy I/O port space
849 * @count: number of bytes to write
850 *
851 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
852 * callback routine (pci_legacy_write).
853 */
854static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
855 struct bin_attribute *bin_attr, char *buf,
856 loff_t off, size_t count)
857{
858 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
859
860 /* Only support 1, 2 or 4 byte accesses */
861 if (count != 1 && count != 2 && count != 4)
862 return -EINVAL;
863
864 return pci_legacy_write(bus, off, *(u32 *)buf, count);
865}
866
867/**
868 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
869 * @filp: open sysfs file
870 * @kobj: kobject corresponding to device to be mapped
871 * @attr: struct bin_attribute for this file
872 * @vma: struct vm_area_struct passed to mmap
873 *
874 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
875 * legacy memory space (first meg of bus space) into application virtual
876 * memory space.
877 */
878static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
879 struct bin_attribute *attr,
880 struct vm_area_struct *vma)
881{
882 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
883
884 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
885}
886
887/**
888 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
889 * @filp: open sysfs file
890 * @kobj: kobject corresponding to device to be mapped
891 * @attr: struct bin_attribute for this file
892 * @vma: struct vm_area_struct passed to mmap
893 *
894 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
895 * legacy IO space (first meg of bus space) into application virtual
896 * memory space. Returns -ENOSYS if the operation isn't supported
897 */
898static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
899 struct bin_attribute *attr,
900 struct vm_area_struct *vma)
901{
902 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
903
904 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
905}
906
907/**
908 * pci_adjust_legacy_attr - adjustment of legacy file attributes
909 * @b: bus to create files under
910 * @mmap_type: I/O port or memory
911 *
912 * Stub implementation. Can be overridden by arch if necessary.
913 */
914void __weak pci_adjust_legacy_attr(struct pci_bus *b,
915 enum pci_mmap_state mmap_type)
916{
917}
918
919/**
920 * pci_create_legacy_files - create legacy I/O port and memory files
921 * @b: bus to create files under
922 *
923 * Some platforms allow access to legacy I/O port and ISA memory space on
924 * a per-bus basis. This routine creates the files and ties them into
925 * their associated read, write and mmap files from pci-sysfs.c
926 *
927 * On error unwind, but don't propagate the error to the caller
928 * as it is ok to set up the PCI bus without these files.
929 */
930void pci_create_legacy_files(struct pci_bus *b)
931{
932 int error;
933
934 b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
935 GFP_ATOMIC);
936 if (!b->legacy_io)
937 goto kzalloc_err;
938
939 sysfs_bin_attr_init(b->legacy_io);
940 b->legacy_io->attr.name = "legacy_io";
941 b->legacy_io->size = 0xffff;
942 b->legacy_io->attr.mode = 0600;
943 b->legacy_io->read = pci_read_legacy_io;
944 b->legacy_io->write = pci_write_legacy_io;
945 b->legacy_io->mmap = pci_mmap_legacy_io;
946 pci_adjust_legacy_attr(b, pci_mmap_io);
947 error = device_create_bin_file(&b->dev, b->legacy_io);
948 if (error)
949 goto legacy_io_err;
950
951 /* Allocated above after the legacy_io struct */
952 b->legacy_mem = b->legacy_io + 1;
953 sysfs_bin_attr_init(b->legacy_mem);
954 b->legacy_mem->attr.name = "legacy_mem";
955 b->legacy_mem->size = 1024*1024;
956 b->legacy_mem->attr.mode = 0600;
957 b->legacy_mem->mmap = pci_mmap_legacy_mem;
958 pci_adjust_legacy_attr(b, pci_mmap_mem);
959 error = device_create_bin_file(&b->dev, b->legacy_mem);
960 if (error)
961 goto legacy_mem_err;
962
963 return;
964
965legacy_mem_err:
966 device_remove_bin_file(&b->dev, b->legacy_io);
967legacy_io_err:
968 kfree(b->legacy_io);
969 b->legacy_io = NULL;
970kzalloc_err:
971 dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n");
972}
973
974void pci_remove_legacy_files(struct pci_bus *b)
975{
976 if (b->legacy_io) {
977 device_remove_bin_file(&b->dev, b->legacy_io);
978 device_remove_bin_file(&b->dev, b->legacy_mem);
979 kfree(b->legacy_io); /* both are allocated here */
980 }
981}
982#endif /* HAVE_PCI_LEGACY */
983
984#if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
985
986int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
987 enum pci_mmap_api mmap_api)
988{
989 unsigned long nr, start, size;
990 resource_size_t pci_start = 0, pci_end;
991
992 if (pci_resource_len(pdev, resno) == 0)
993 return 0;
994 nr = vma_pages(vma);
995 start = vma->vm_pgoff;
996 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
997 if (mmap_api == PCI_MMAP_PROCFS) {
998 pci_resource_to_user(pdev, resno, &pdev->resource[resno],
999 &pci_start, &pci_end);
1000 pci_start >>= PAGE_SHIFT;
1001 }
1002 if (start >= pci_start && start < pci_start + size &&
1003 start + nr <= pci_start + size)
1004 return 1;
1005 return 0;
1006}
1007
1008/**
1009 * pci_mmap_resource - map a PCI resource into user memory space
1010 * @kobj: kobject for mapping
1011 * @attr: struct bin_attribute for the file being mapped
1012 * @vma: struct vm_area_struct passed into the mmap
1013 * @write_combine: 1 for write_combine mapping
1014 *
1015 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1016 */
1017static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1018 struct vm_area_struct *vma, int write_combine)
1019{
1020 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1021 int bar = (unsigned long)attr->private;
1022 enum pci_mmap_state mmap_type;
1023 struct resource *res = &pdev->resource[bar];
1024 int ret;
1025
1026 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1027 if (ret)
1028 return ret;
1029
1030 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1031 return -EINVAL;
1032
1033 if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1034 return -EINVAL;
1035
1036 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1037
1038 return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1039}
1040
1041static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1042 struct bin_attribute *attr,
1043 struct vm_area_struct *vma)
1044{
1045 return pci_mmap_resource(kobj, attr, vma, 0);
1046}
1047
1048static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1049 struct bin_attribute *attr,
1050 struct vm_area_struct *vma)
1051{
1052 return pci_mmap_resource(kobj, attr, vma, 1);
1053}
1054
1055static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1056 struct bin_attribute *attr, char *buf,
1057 loff_t off, size_t count, bool write)
1058{
1059 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1060 int bar = (unsigned long)attr->private;
1061 unsigned long port = off;
1062
1063 port += pci_resource_start(pdev, bar);
1064
1065 if (port > pci_resource_end(pdev, bar))
1066 return 0;
1067
1068 if (port + count - 1 > pci_resource_end(pdev, bar))
1069 return -EINVAL;
1070
1071 switch (count) {
1072 case 1:
1073 if (write)
1074 outb(*(u8 *)buf, port);
1075 else
1076 *(u8 *)buf = inb(port);
1077 return 1;
1078 case 2:
1079 if (write)
1080 outw(*(u16 *)buf, port);
1081 else
1082 *(u16 *)buf = inw(port);
1083 return 2;
1084 case 4:
1085 if (write)
1086 outl(*(u32 *)buf, port);
1087 else
1088 *(u32 *)buf = inl(port);
1089 return 4;
1090 }
1091 return -EINVAL;
1092}
1093
1094static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1095 struct bin_attribute *attr, char *buf,
1096 loff_t off, size_t count)
1097{
1098 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1099}
1100
1101static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1102 struct bin_attribute *attr, char *buf,
1103 loff_t off, size_t count)
1104{
1105 int ret;
1106
1107 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1108 if (ret)
1109 return ret;
1110
1111 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1112}
1113
1114/**
1115 * pci_remove_resource_files - cleanup resource files
1116 * @pdev: dev to cleanup
1117 *
1118 * If we created resource files for @pdev, remove them from sysfs and
1119 * free their resources.
1120 */
1121static void pci_remove_resource_files(struct pci_dev *pdev)
1122{
1123 int i;
1124
1125 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1126 struct bin_attribute *res_attr;
1127
1128 res_attr = pdev->res_attr[i];
1129 if (res_attr) {
1130 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1131 kfree(res_attr);
1132 }
1133
1134 res_attr = pdev->res_attr_wc[i];
1135 if (res_attr) {
1136 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1137 kfree(res_attr);
1138 }
1139 }
1140}
1141
1142static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1143{
1144 /* allocate attribute structure, piggyback attribute name */
1145 int name_len = write_combine ? 13 : 10;
1146 struct bin_attribute *res_attr;
1147 char *res_attr_name;
1148 int retval;
1149
1150 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1151 if (!res_attr)
1152 return -ENOMEM;
1153
1154 res_attr_name = (char *)(res_attr + 1);
1155
1156 sysfs_bin_attr_init(res_attr);
1157 if (write_combine) {
1158 pdev->res_attr_wc[num] = res_attr;
1159 sprintf(res_attr_name, "resource%d_wc", num);
1160 res_attr->mmap = pci_mmap_resource_wc;
1161 } else {
1162 pdev->res_attr[num] = res_attr;
1163 sprintf(res_attr_name, "resource%d", num);
1164 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1165 res_attr->read = pci_read_resource_io;
1166 res_attr->write = pci_write_resource_io;
1167 if (arch_can_pci_mmap_io())
1168 res_attr->mmap = pci_mmap_resource_uc;
1169 } else {
1170 res_attr->mmap = pci_mmap_resource_uc;
1171 }
1172 }
1173 res_attr->attr.name = res_attr_name;
1174 res_attr->attr.mode = 0600;
1175 res_attr->size = pci_resource_len(pdev, num);
1176 res_attr->private = (void *)(unsigned long)num;
1177 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1178 if (retval)
1179 kfree(res_attr);
1180
1181 return retval;
1182}
1183
1184/**
1185 * pci_create_resource_files - create resource files in sysfs for @dev
1186 * @pdev: dev in question
1187 *
1188 * Walk the resources in @pdev creating files for each resource available.
1189 */
1190static int pci_create_resource_files(struct pci_dev *pdev)
1191{
1192 int i;
1193 int retval;
1194
1195 /* Expose the PCI resources from this device as files */
1196 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1197
1198 /* skip empty resources */
1199 if (!pci_resource_len(pdev, i))
1200 continue;
1201
1202 retval = pci_create_attr(pdev, i, 0);
1203 /* for prefetchable resources, create a WC mappable file */
1204 if (!retval && arch_can_pci_mmap_wc() &&
1205 pdev->resource[i].flags & IORESOURCE_PREFETCH)
1206 retval = pci_create_attr(pdev, i, 1);
1207 if (retval) {
1208 pci_remove_resource_files(pdev);
1209 return retval;
1210 }
1211 }
1212 return 0;
1213}
1214#else /* !HAVE_PCI_MMAP */
1215int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1216void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1217#endif /* HAVE_PCI_MMAP */
1218
1219/**
1220 * pci_write_rom - used to enable access to the PCI ROM display
1221 * @filp: sysfs file
1222 * @kobj: kernel object handle
1223 * @bin_attr: struct bin_attribute for this file
1224 * @buf: user input
1225 * @off: file offset
1226 * @count: number of byte in input
1227 *
1228 * writing anything except 0 enables it
1229 */
1230static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1231 struct bin_attribute *bin_attr, char *buf,
1232 loff_t off, size_t count)
1233{
1234 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1235
1236 if ((off == 0) && (*buf == '0') && (count == 2))
1237 pdev->rom_attr_enabled = 0;
1238 else
1239 pdev->rom_attr_enabled = 1;
1240
1241 return count;
1242}
1243
1244/**
1245 * pci_read_rom - read a PCI ROM
1246 * @filp: sysfs file
1247 * @kobj: kernel object handle
1248 * @bin_attr: struct bin_attribute for this file
1249 * @buf: where to put the data we read from the ROM
1250 * @off: file offset
1251 * @count: number of bytes to read
1252 *
1253 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1254 * device corresponding to @kobj.
1255 */
1256static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1257 struct bin_attribute *bin_attr, char *buf,
1258 loff_t off, size_t count)
1259{
1260 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1261 void __iomem *rom;
1262 size_t size;
1263
1264 if (!pdev->rom_attr_enabled)
1265 return -EINVAL;
1266
1267 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1268 if (!rom || !size)
1269 return -EIO;
1270
1271 if (off >= size)
1272 count = 0;
1273 else {
1274 if (off + count > size)
1275 count = size - off;
1276
1277 memcpy_fromio(buf, rom + off, count);
1278 }
1279 pci_unmap_rom(pdev, rom);
1280
1281 return count;
1282}
1283
1284static const struct bin_attribute pci_config_attr = {
1285 .attr = {
1286 .name = "config",
1287 .mode = 0644,
1288 },
1289 .size = PCI_CFG_SPACE_SIZE,
1290 .read = pci_read_config,
1291 .write = pci_write_config,
1292};
1293
1294static const struct bin_attribute pcie_config_attr = {
1295 .attr = {
1296 .name = "config",
1297 .mode = 0644,
1298 },
1299 .size = PCI_CFG_SPACE_EXP_SIZE,
1300 .read = pci_read_config,
1301 .write = pci_write_config,
1302};
1303
1304static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1305 const char *buf, size_t count)
1306{
1307 struct pci_dev *pdev = to_pci_dev(dev);
1308 unsigned long val;
1309 ssize_t result = kstrtoul(buf, 0, &val);
1310
1311 if (result < 0)
1312 return result;
1313
1314 if (val != 1)
1315 return -EINVAL;
1316
1317 pm_runtime_get_sync(dev);
1318 result = pci_reset_function(pdev);
1319 pm_runtime_put(dev);
1320 if (result < 0)
1321 return result;
1322
1323 return count;
1324}
1325
1326static DEVICE_ATTR(reset, 0200, NULL, reset_store);
1327
1328static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1329{
1330 int retval;
1331
1332 pcie_vpd_create_sysfs_dev_files(dev);
1333 pcie_aspm_create_sysfs_dev_files(dev);
1334
1335 if (dev->reset_fn) {
1336 retval = device_create_file(&dev->dev, &dev_attr_reset);
1337 if (retval)
1338 goto error;
1339 }
1340 return 0;
1341
1342error:
1343 pcie_aspm_remove_sysfs_dev_files(dev);
1344 pcie_vpd_remove_sysfs_dev_files(dev);
1345 return retval;
1346}
1347
1348int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1349{
1350 int retval;
1351 int rom_size;
1352 struct bin_attribute *attr;
1353
1354 if (!sysfs_initialized)
1355 return -EACCES;
1356
1357 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1358 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1359 else
1360 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1361 if (retval)
1362 goto err;
1363
1364 retval = pci_create_resource_files(pdev);
1365 if (retval)
1366 goto err_config_file;
1367
1368 /* If the device has a ROM, try to expose it in sysfs. */
1369 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1370 if (rom_size) {
1371 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1372 if (!attr) {
1373 retval = -ENOMEM;
1374 goto err_resource_files;
1375 }
1376 sysfs_bin_attr_init(attr);
1377 attr->size = rom_size;
1378 attr->attr.name = "rom";
1379 attr->attr.mode = 0600;
1380 attr->read = pci_read_rom;
1381 attr->write = pci_write_rom;
1382 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1383 if (retval) {
1384 kfree(attr);
1385 goto err_resource_files;
1386 }
1387 pdev->rom_attr = attr;
1388 }
1389
1390 /* add sysfs entries for various capabilities */
1391 retval = pci_create_capabilities_sysfs(pdev);
1392 if (retval)
1393 goto err_rom_file;
1394
1395 pci_create_firmware_label_files(pdev);
1396
1397 return 0;
1398
1399err_rom_file:
1400 if (pdev->rom_attr) {
1401 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1402 kfree(pdev->rom_attr);
1403 pdev->rom_attr = NULL;
1404 }
1405err_resource_files:
1406 pci_remove_resource_files(pdev);
1407err_config_file:
1408 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1409 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1410 else
1411 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1412err:
1413 return retval;
1414}
1415
1416static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1417{
1418 pcie_vpd_remove_sysfs_dev_files(dev);
1419 pcie_aspm_remove_sysfs_dev_files(dev);
1420 if (dev->reset_fn) {
1421 device_remove_file(&dev->dev, &dev_attr_reset);
1422 dev->reset_fn = 0;
1423 }
1424}
1425
1426/**
1427 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1428 * @pdev: device whose entries we should free
1429 *
1430 * Cleanup when @pdev is removed from sysfs.
1431 */
1432void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1433{
1434 if (!sysfs_initialized)
1435 return;
1436
1437 pci_remove_capabilities_sysfs(pdev);
1438
1439 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1440 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1441 else
1442 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1443
1444 pci_remove_resource_files(pdev);
1445
1446 if (pdev->rom_attr) {
1447 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1448 kfree(pdev->rom_attr);
1449 pdev->rom_attr = NULL;
1450 }
1451
1452 pci_remove_firmware_label_files(pdev);
1453}
1454
1455static int __init pci_sysfs_init(void)
1456{
1457 struct pci_dev *pdev = NULL;
1458 int retval;
1459
1460 sysfs_initialized = 1;
1461 for_each_pci_dev(pdev) {
1462 retval = pci_create_sysfs_dev_files(pdev);
1463 if (retval) {
1464 pci_dev_put(pdev);
1465 return retval;
1466 }
1467 }
1468
1469 return 0;
1470}
1471late_initcall(pci_sysfs_init);
1472
1473static struct attribute *pci_dev_dev_attrs[] = {
1474 &dev_attr_boot_vga.attr,
1475 NULL,
1476};
1477
1478static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1479 struct attribute *a, int n)
1480{
1481 struct device *dev = kobj_to_dev(kobj);
1482 struct pci_dev *pdev = to_pci_dev(dev);
1483
1484 if (a == &dev_attr_boot_vga.attr)
1485 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1486 return 0;
1487
1488 return a->mode;
1489}
1490
1491static struct attribute *pci_dev_hp_attrs[] = {
1492 &dev_attr_remove.attr,
1493 &dev_attr_dev_rescan.attr,
1494 NULL,
1495};
1496
1497static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1498 struct attribute *a, int n)
1499{
1500 struct device *dev = kobj_to_dev(kobj);
1501 struct pci_dev *pdev = to_pci_dev(dev);
1502
1503 if (pdev->is_virtfn)
1504 return 0;
1505
1506 return a->mode;
1507}
1508
1509static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1510 struct attribute *a, int n)
1511{
1512 struct device *dev = kobj_to_dev(kobj);
1513 struct pci_dev *pdev = to_pci_dev(dev);
1514
1515 if (pci_is_bridge(pdev))
1516 return a->mode;
1517
1518 return 0;
1519}
1520
1521static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1522 struct attribute *a, int n)
1523{
1524 struct device *dev = kobj_to_dev(kobj);
1525 struct pci_dev *pdev = to_pci_dev(dev);
1526
1527 if (pci_is_pcie(pdev))
1528 return a->mode;
1529
1530 return 0;
1531}
1532
1533static const struct attribute_group pci_dev_group = {
1534 .attrs = pci_dev_attrs,
1535};
1536
1537const struct attribute_group *pci_dev_groups[] = {
1538 &pci_dev_group,
1539 NULL,
1540};
1541
1542static const struct attribute_group pci_bridge_group = {
1543 .attrs = pci_bridge_attrs,
1544};
1545
1546const struct attribute_group *pci_bridge_groups[] = {
1547 &pci_bridge_group,
1548 NULL,
1549};
1550
1551static const struct attribute_group pcie_dev_group = {
1552 .attrs = pcie_dev_attrs,
1553};
1554
1555const struct attribute_group *pcie_dev_groups[] = {
1556 &pcie_dev_group,
1557 NULL,
1558};
1559
1560static const struct attribute_group pci_dev_hp_attr_group = {
1561 .attrs = pci_dev_hp_attrs,
1562 .is_visible = pci_dev_hp_attrs_are_visible,
1563};
1564
1565static const struct attribute_group pci_dev_attr_group = {
1566 .attrs = pci_dev_dev_attrs,
1567 .is_visible = pci_dev_attrs_are_visible,
1568};
1569
1570static const struct attribute_group pci_bridge_attr_group = {
1571 .attrs = pci_bridge_attrs,
1572 .is_visible = pci_bridge_attrs_are_visible,
1573};
1574
1575static const struct attribute_group pcie_dev_attr_group = {
1576 .attrs = pcie_dev_attrs,
1577 .is_visible = pcie_dev_attrs_are_visible,
1578};
1579
1580static const struct attribute_group *pci_dev_attr_groups[] = {
1581 &pci_dev_attr_group,
1582 &pci_dev_hp_attr_group,
1583#ifdef CONFIG_PCI_IOV
1584 &sriov_dev_attr_group,
1585#endif
1586 &pci_bridge_attr_group,
1587 &pcie_dev_attr_group,
1588#ifdef CONFIG_PCIEAER
1589 &aer_stats_attr_group,
1590#endif
1591 NULL,
1592};
1593
1594const struct device_type pci_dev_type = {
1595 .groups = pci_dev_attr_groups,
1596};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
4 * (C) Copyright 2002-2004 IBM Corp.
5 * (C) Copyright 2003 Matthew Wilcox
6 * (C) Copyright 2003 Hewlett-Packard
7 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
8 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
9 *
10 * File attributes for PCI devices
11 *
12 * Modeled after usb's driverfs.c
13 */
14
15
16#include <linux/kernel.h>
17#include <linux/sched.h>
18#include <linux/pci.h>
19#include <linux/stat.h>
20#include <linux/export.h>
21#include <linux/topology.h>
22#include <linux/mm.h>
23#include <linux/fs.h>
24#include <linux/capability.h>
25#include <linux/security.h>
26#include <linux/slab.h>
27#include <linux/vgaarb.h>
28#include <linux/pm_runtime.h>
29#include <linux/of.h>
30#include "pci.h"
31
32static int sysfs_initialized; /* = 0 */
33
34/* show configuration fields */
35#define pci_config_attr(field, format_string) \
36static ssize_t \
37field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
38{ \
39 struct pci_dev *pdev; \
40 \
41 pdev = to_pci_dev(dev); \
42 return sysfs_emit(buf, format_string, pdev->field); \
43} \
44static DEVICE_ATTR_RO(field)
45
46pci_config_attr(vendor, "0x%04x\n");
47pci_config_attr(device, "0x%04x\n");
48pci_config_attr(subsystem_vendor, "0x%04x\n");
49pci_config_attr(subsystem_device, "0x%04x\n");
50pci_config_attr(revision, "0x%02x\n");
51pci_config_attr(class, "0x%06x\n");
52pci_config_attr(irq, "%u\n");
53
54static ssize_t broken_parity_status_show(struct device *dev,
55 struct device_attribute *attr,
56 char *buf)
57{
58 struct pci_dev *pdev = to_pci_dev(dev);
59 return sysfs_emit(buf, "%u\n", pdev->broken_parity_status);
60}
61
62static ssize_t broken_parity_status_store(struct device *dev,
63 struct device_attribute *attr,
64 const char *buf, size_t count)
65{
66 struct pci_dev *pdev = to_pci_dev(dev);
67 unsigned long val;
68
69 if (kstrtoul(buf, 0, &val) < 0)
70 return -EINVAL;
71
72 pdev->broken_parity_status = !!val;
73
74 return count;
75}
76static DEVICE_ATTR_RW(broken_parity_status);
77
78static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
79 struct device_attribute *attr, char *buf)
80{
81 const struct cpumask *mask;
82
83#ifdef CONFIG_NUMA
84 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
85 cpumask_of_node(dev_to_node(dev));
86#else
87 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
88#endif
89 return cpumap_print_to_pagebuf(list, buf, mask);
90}
91
92static ssize_t local_cpus_show(struct device *dev,
93 struct device_attribute *attr, char *buf)
94{
95 return pci_dev_show_local_cpu(dev, false, attr, buf);
96}
97static DEVICE_ATTR_RO(local_cpus);
98
99static ssize_t local_cpulist_show(struct device *dev,
100 struct device_attribute *attr, char *buf)
101{
102 return pci_dev_show_local_cpu(dev, true, attr, buf);
103}
104static DEVICE_ATTR_RO(local_cpulist);
105
106/*
107 * PCI Bus Class Devices
108 */
109static ssize_t cpuaffinity_show(struct device *dev,
110 struct device_attribute *attr, char *buf)
111{
112 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
113
114 return cpumap_print_to_pagebuf(false, buf, cpumask);
115}
116static DEVICE_ATTR_RO(cpuaffinity);
117
118static ssize_t cpulistaffinity_show(struct device *dev,
119 struct device_attribute *attr, char *buf)
120{
121 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
122
123 return cpumap_print_to_pagebuf(true, buf, cpumask);
124}
125static DEVICE_ATTR_RO(cpulistaffinity);
126
127static ssize_t power_state_show(struct device *dev,
128 struct device_attribute *attr, char *buf)
129{
130 struct pci_dev *pdev = to_pci_dev(dev);
131
132 return sysfs_emit(buf, "%s\n", pci_power_name(pdev->current_state));
133}
134static DEVICE_ATTR_RO(power_state);
135
136/* show resources */
137static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
138 char *buf)
139{
140 struct pci_dev *pci_dev = to_pci_dev(dev);
141 int i;
142 int max;
143 resource_size_t start, end;
144 size_t len = 0;
145
146 if (pci_dev->subordinate)
147 max = DEVICE_COUNT_RESOURCE;
148 else
149 max = PCI_BRIDGE_RESOURCES;
150
151 for (i = 0; i < max; i++) {
152 struct resource *res = &pci_dev->resource[i];
153 pci_resource_to_user(pci_dev, i, res, &start, &end);
154 len += sysfs_emit_at(buf, len, "0x%016llx 0x%016llx 0x%016llx\n",
155 (unsigned long long)start,
156 (unsigned long long)end,
157 (unsigned long long)res->flags);
158 }
159 return len;
160}
161static DEVICE_ATTR_RO(resource);
162
163static ssize_t max_link_speed_show(struct device *dev,
164 struct device_attribute *attr, char *buf)
165{
166 struct pci_dev *pdev = to_pci_dev(dev);
167
168 return sysfs_emit(buf, "%s\n",
169 pci_speed_string(pcie_get_speed_cap(pdev)));
170}
171static DEVICE_ATTR_RO(max_link_speed);
172
173static ssize_t max_link_width_show(struct device *dev,
174 struct device_attribute *attr, char *buf)
175{
176 struct pci_dev *pdev = to_pci_dev(dev);
177
178 return sysfs_emit(buf, "%u\n", pcie_get_width_cap(pdev));
179}
180static DEVICE_ATTR_RO(max_link_width);
181
182static ssize_t current_link_speed_show(struct device *dev,
183 struct device_attribute *attr, char *buf)
184{
185 struct pci_dev *pci_dev = to_pci_dev(dev);
186 u16 linkstat;
187 int err;
188 enum pci_bus_speed speed;
189
190 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
191 if (err)
192 return -EINVAL;
193
194 speed = pcie_link_speed[linkstat & PCI_EXP_LNKSTA_CLS];
195
196 return sysfs_emit(buf, "%s\n", pci_speed_string(speed));
197}
198static DEVICE_ATTR_RO(current_link_speed);
199
200static ssize_t current_link_width_show(struct device *dev,
201 struct device_attribute *attr, char *buf)
202{
203 struct pci_dev *pci_dev = to_pci_dev(dev);
204 u16 linkstat;
205 int err;
206
207 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
208 if (err)
209 return -EINVAL;
210
211 return sysfs_emit(buf, "%u\n",
212 (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
213}
214static DEVICE_ATTR_RO(current_link_width);
215
216static ssize_t secondary_bus_number_show(struct device *dev,
217 struct device_attribute *attr,
218 char *buf)
219{
220 struct pci_dev *pci_dev = to_pci_dev(dev);
221 u8 sec_bus;
222 int err;
223
224 err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
225 if (err)
226 return -EINVAL;
227
228 return sysfs_emit(buf, "%u\n", sec_bus);
229}
230static DEVICE_ATTR_RO(secondary_bus_number);
231
232static ssize_t subordinate_bus_number_show(struct device *dev,
233 struct device_attribute *attr,
234 char *buf)
235{
236 struct pci_dev *pci_dev = to_pci_dev(dev);
237 u8 sub_bus;
238 int err;
239
240 err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
241 if (err)
242 return -EINVAL;
243
244 return sysfs_emit(buf, "%u\n", sub_bus);
245}
246static DEVICE_ATTR_RO(subordinate_bus_number);
247
248static ssize_t ari_enabled_show(struct device *dev,
249 struct device_attribute *attr,
250 char *buf)
251{
252 struct pci_dev *pci_dev = to_pci_dev(dev);
253
254 return sysfs_emit(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
255}
256static DEVICE_ATTR_RO(ari_enabled);
257
258static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
259 char *buf)
260{
261 struct pci_dev *pci_dev = to_pci_dev(dev);
262
263 return sysfs_emit(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
264 pci_dev->vendor, pci_dev->device,
265 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
266 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
267 (u8)(pci_dev->class));
268}
269static DEVICE_ATTR_RO(modalias);
270
271static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
272 const char *buf, size_t count)
273{
274 struct pci_dev *pdev = to_pci_dev(dev);
275 unsigned long val;
276 ssize_t result = kstrtoul(buf, 0, &val);
277
278 if (result < 0)
279 return result;
280
281 /* this can crash the machine when done on the "wrong" device */
282 if (!capable(CAP_SYS_ADMIN))
283 return -EPERM;
284
285 device_lock(dev);
286 if (dev->driver)
287 result = -EBUSY;
288 else if (val)
289 result = pci_enable_device(pdev);
290 else if (pci_is_enabled(pdev))
291 pci_disable_device(pdev);
292 else
293 result = -EIO;
294 device_unlock(dev);
295
296 return result < 0 ? result : count;
297}
298
299static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
300 char *buf)
301{
302 struct pci_dev *pdev;
303
304 pdev = to_pci_dev(dev);
305 return sysfs_emit(buf, "%u\n", atomic_read(&pdev->enable_cnt));
306}
307static DEVICE_ATTR_RW(enable);
308
309#ifdef CONFIG_NUMA
310static ssize_t numa_node_store(struct device *dev,
311 struct device_attribute *attr, const char *buf,
312 size_t count)
313{
314 struct pci_dev *pdev = to_pci_dev(dev);
315 int node, ret;
316
317 if (!capable(CAP_SYS_ADMIN))
318 return -EPERM;
319
320 ret = kstrtoint(buf, 0, &node);
321 if (ret)
322 return ret;
323
324 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
325 return -EINVAL;
326
327 if (node != NUMA_NO_NODE && !node_online(node))
328 return -EINVAL;
329
330 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
331 pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
332 node);
333
334 dev->numa_node = node;
335 return count;
336}
337
338static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
339 char *buf)
340{
341 return sysfs_emit(buf, "%d\n", dev->numa_node);
342}
343static DEVICE_ATTR_RW(numa_node);
344#endif
345
346static ssize_t dma_mask_bits_show(struct device *dev,
347 struct device_attribute *attr, char *buf)
348{
349 struct pci_dev *pdev = to_pci_dev(dev);
350
351 return sysfs_emit(buf, "%d\n", fls64(pdev->dma_mask));
352}
353static DEVICE_ATTR_RO(dma_mask_bits);
354
355static ssize_t consistent_dma_mask_bits_show(struct device *dev,
356 struct device_attribute *attr,
357 char *buf)
358{
359 return sysfs_emit(buf, "%d\n", fls64(dev->coherent_dma_mask));
360}
361static DEVICE_ATTR_RO(consistent_dma_mask_bits);
362
363static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
364 char *buf)
365{
366 struct pci_dev *pdev = to_pci_dev(dev);
367 struct pci_bus *subordinate = pdev->subordinate;
368
369 return sysfs_emit(buf, "%u\n", subordinate ?
370 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
371 : !pdev->no_msi);
372}
373
374static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
375 const char *buf, size_t count)
376{
377 struct pci_dev *pdev = to_pci_dev(dev);
378 struct pci_bus *subordinate = pdev->subordinate;
379 unsigned long val;
380
381 if (kstrtoul(buf, 0, &val) < 0)
382 return -EINVAL;
383
384 if (!capable(CAP_SYS_ADMIN))
385 return -EPERM;
386
387 /*
388 * "no_msi" and "bus_flags" only affect what happens when a driver
389 * requests MSI or MSI-X. They don't affect any drivers that have
390 * already requested MSI or MSI-X.
391 */
392 if (!subordinate) {
393 pdev->no_msi = !val;
394 pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
395 val ? "allowed" : "disallowed");
396 return count;
397 }
398
399 if (val)
400 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
401 else
402 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
403
404 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
405 val ? "allowed" : "disallowed");
406 return count;
407}
408static DEVICE_ATTR_RW(msi_bus);
409
410static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count)
411{
412 unsigned long val;
413 struct pci_bus *b = NULL;
414
415 if (kstrtoul(buf, 0, &val) < 0)
416 return -EINVAL;
417
418 if (val) {
419 pci_lock_rescan_remove();
420 while ((b = pci_find_next_bus(b)) != NULL)
421 pci_rescan_bus(b);
422 pci_unlock_rescan_remove();
423 }
424 return count;
425}
426static BUS_ATTR_WO(rescan);
427
428static struct attribute *pci_bus_attrs[] = {
429 &bus_attr_rescan.attr,
430 NULL,
431};
432
433static const struct attribute_group pci_bus_group = {
434 .attrs = pci_bus_attrs,
435};
436
437const struct attribute_group *pci_bus_groups[] = {
438 &pci_bus_group,
439 NULL,
440};
441
442static ssize_t dev_rescan_store(struct device *dev,
443 struct device_attribute *attr, const char *buf,
444 size_t count)
445{
446 unsigned long val;
447 struct pci_dev *pdev = to_pci_dev(dev);
448
449 if (kstrtoul(buf, 0, &val) < 0)
450 return -EINVAL;
451
452 if (val) {
453 pci_lock_rescan_remove();
454 pci_rescan_bus(pdev->bus);
455 pci_unlock_rescan_remove();
456 }
457 return count;
458}
459static struct device_attribute dev_attr_dev_rescan = __ATTR(rescan, 0200, NULL,
460 dev_rescan_store);
461
462static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
463 const char *buf, size_t count)
464{
465 unsigned long val;
466
467 if (kstrtoul(buf, 0, &val) < 0)
468 return -EINVAL;
469
470 if (val && device_remove_file_self(dev, attr))
471 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
472 return count;
473}
474static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0220, NULL,
475 remove_store);
476
477static ssize_t bus_rescan_store(struct device *dev,
478 struct device_attribute *attr,
479 const char *buf, size_t count)
480{
481 unsigned long val;
482 struct pci_bus *bus = to_pci_bus(dev);
483
484 if (kstrtoul(buf, 0, &val) < 0)
485 return -EINVAL;
486
487 if (val) {
488 pci_lock_rescan_remove();
489 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
490 pci_rescan_bus_bridge_resize(bus->self);
491 else
492 pci_rescan_bus(bus);
493 pci_unlock_rescan_remove();
494 }
495 return count;
496}
497static struct device_attribute dev_attr_bus_rescan = __ATTR(rescan, 0200, NULL,
498 bus_rescan_store);
499
500#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
501static ssize_t d3cold_allowed_store(struct device *dev,
502 struct device_attribute *attr,
503 const char *buf, size_t count)
504{
505 struct pci_dev *pdev = to_pci_dev(dev);
506 unsigned long val;
507
508 if (kstrtoul(buf, 0, &val) < 0)
509 return -EINVAL;
510
511 pdev->d3cold_allowed = !!val;
512 if (pdev->d3cold_allowed)
513 pci_d3cold_enable(pdev);
514 else
515 pci_d3cold_disable(pdev);
516
517 pm_runtime_resume(dev);
518
519 return count;
520}
521
522static ssize_t d3cold_allowed_show(struct device *dev,
523 struct device_attribute *attr, char *buf)
524{
525 struct pci_dev *pdev = to_pci_dev(dev);
526 return sysfs_emit(buf, "%u\n", pdev->d3cold_allowed);
527}
528static DEVICE_ATTR_RW(d3cold_allowed);
529#endif
530
531#ifdef CONFIG_OF
532static ssize_t devspec_show(struct device *dev,
533 struct device_attribute *attr, char *buf)
534{
535 struct pci_dev *pdev = to_pci_dev(dev);
536 struct device_node *np = pci_device_to_OF_node(pdev);
537
538 if (np == NULL)
539 return 0;
540 return sysfs_emit(buf, "%pOF\n", np);
541}
542static DEVICE_ATTR_RO(devspec);
543#endif
544
545static ssize_t driver_override_store(struct device *dev,
546 struct device_attribute *attr,
547 const char *buf, size_t count)
548{
549 struct pci_dev *pdev = to_pci_dev(dev);
550 char *driver_override, *old, *cp;
551
552 /* We need to keep extra room for a newline */
553 if (count >= (PAGE_SIZE - 1))
554 return -EINVAL;
555
556 driver_override = kstrndup(buf, count, GFP_KERNEL);
557 if (!driver_override)
558 return -ENOMEM;
559
560 cp = strchr(driver_override, '\n');
561 if (cp)
562 *cp = '\0';
563
564 device_lock(dev);
565 old = pdev->driver_override;
566 if (strlen(driver_override)) {
567 pdev->driver_override = driver_override;
568 } else {
569 kfree(driver_override);
570 pdev->driver_override = NULL;
571 }
572 device_unlock(dev);
573
574 kfree(old);
575
576 return count;
577}
578
579static ssize_t driver_override_show(struct device *dev,
580 struct device_attribute *attr, char *buf)
581{
582 struct pci_dev *pdev = to_pci_dev(dev);
583 ssize_t len;
584
585 device_lock(dev);
586 len = sysfs_emit(buf, "%s\n", pdev->driver_override);
587 device_unlock(dev);
588 return len;
589}
590static DEVICE_ATTR_RW(driver_override);
591
592static struct attribute *pci_dev_attrs[] = {
593 &dev_attr_power_state.attr,
594 &dev_attr_resource.attr,
595 &dev_attr_vendor.attr,
596 &dev_attr_device.attr,
597 &dev_attr_subsystem_vendor.attr,
598 &dev_attr_subsystem_device.attr,
599 &dev_attr_revision.attr,
600 &dev_attr_class.attr,
601 &dev_attr_irq.attr,
602 &dev_attr_local_cpus.attr,
603 &dev_attr_local_cpulist.attr,
604 &dev_attr_modalias.attr,
605#ifdef CONFIG_NUMA
606 &dev_attr_numa_node.attr,
607#endif
608 &dev_attr_dma_mask_bits.attr,
609 &dev_attr_consistent_dma_mask_bits.attr,
610 &dev_attr_enable.attr,
611 &dev_attr_broken_parity_status.attr,
612 &dev_attr_msi_bus.attr,
613#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
614 &dev_attr_d3cold_allowed.attr,
615#endif
616#ifdef CONFIG_OF
617 &dev_attr_devspec.attr,
618#endif
619 &dev_attr_driver_override.attr,
620 &dev_attr_ari_enabled.attr,
621 NULL,
622};
623
624static struct attribute *pci_bridge_attrs[] = {
625 &dev_attr_subordinate_bus_number.attr,
626 &dev_attr_secondary_bus_number.attr,
627 NULL,
628};
629
630static struct attribute *pcie_dev_attrs[] = {
631 &dev_attr_current_link_speed.attr,
632 &dev_attr_current_link_width.attr,
633 &dev_attr_max_link_width.attr,
634 &dev_attr_max_link_speed.attr,
635 NULL,
636};
637
638static struct attribute *pcibus_attrs[] = {
639 &dev_attr_bus_rescan.attr,
640 &dev_attr_cpuaffinity.attr,
641 &dev_attr_cpulistaffinity.attr,
642 NULL,
643};
644
645static const struct attribute_group pcibus_group = {
646 .attrs = pcibus_attrs,
647};
648
649const struct attribute_group *pcibus_groups[] = {
650 &pcibus_group,
651 NULL,
652};
653
654static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
655 char *buf)
656{
657 struct pci_dev *pdev = to_pci_dev(dev);
658 struct pci_dev *vga_dev = vga_default_device();
659
660 if (vga_dev)
661 return sysfs_emit(buf, "%u\n", (pdev == vga_dev));
662
663 return sysfs_emit(buf, "%u\n",
664 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
665 IORESOURCE_ROM_SHADOW));
666}
667static DEVICE_ATTR_RO(boot_vga);
668
669static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
670 struct bin_attribute *bin_attr, char *buf,
671 loff_t off, size_t count)
672{
673 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
674 unsigned int size = 64;
675 loff_t init_off = off;
676 u8 *data = (u8 *) buf;
677
678 /* Several chips lock up trying to read undefined config space */
679 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
680 size = dev->cfg_size;
681 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
682 size = 128;
683
684 if (off > size)
685 return 0;
686 if (off + count > size) {
687 size -= off;
688 count = size;
689 } else {
690 size = count;
691 }
692
693 pci_config_pm_runtime_get(dev);
694
695 if ((off & 1) && size) {
696 u8 val;
697 pci_user_read_config_byte(dev, off, &val);
698 data[off - init_off] = val;
699 off++;
700 size--;
701 }
702
703 if ((off & 3) && size > 2) {
704 u16 val;
705 pci_user_read_config_word(dev, off, &val);
706 data[off - init_off] = val & 0xff;
707 data[off - init_off + 1] = (val >> 8) & 0xff;
708 off += 2;
709 size -= 2;
710 }
711
712 while (size > 3) {
713 u32 val;
714 pci_user_read_config_dword(dev, off, &val);
715 data[off - init_off] = val & 0xff;
716 data[off - init_off + 1] = (val >> 8) & 0xff;
717 data[off - init_off + 2] = (val >> 16) & 0xff;
718 data[off - init_off + 3] = (val >> 24) & 0xff;
719 off += 4;
720 size -= 4;
721 cond_resched();
722 }
723
724 if (size >= 2) {
725 u16 val;
726 pci_user_read_config_word(dev, off, &val);
727 data[off - init_off] = val & 0xff;
728 data[off - init_off + 1] = (val >> 8) & 0xff;
729 off += 2;
730 size -= 2;
731 }
732
733 if (size > 0) {
734 u8 val;
735 pci_user_read_config_byte(dev, off, &val);
736 data[off - init_off] = val;
737 off++;
738 --size;
739 }
740
741 pci_config_pm_runtime_put(dev);
742
743 return count;
744}
745
746static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
747 struct bin_attribute *bin_attr, char *buf,
748 loff_t off, size_t count)
749{
750 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
751 unsigned int size = count;
752 loff_t init_off = off;
753 u8 *data = (u8 *) buf;
754 int ret;
755
756 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
757 if (ret)
758 return ret;
759
760 if (off > dev->cfg_size)
761 return 0;
762 if (off + count > dev->cfg_size) {
763 size = dev->cfg_size - off;
764 count = size;
765 }
766
767 pci_config_pm_runtime_get(dev);
768
769 if ((off & 1) && size) {
770 pci_user_write_config_byte(dev, off, data[off - init_off]);
771 off++;
772 size--;
773 }
774
775 if ((off & 3) && size > 2) {
776 u16 val = data[off - init_off];
777 val |= (u16) data[off - init_off + 1] << 8;
778 pci_user_write_config_word(dev, off, val);
779 off += 2;
780 size -= 2;
781 }
782
783 while (size > 3) {
784 u32 val = data[off - init_off];
785 val |= (u32) data[off - init_off + 1] << 8;
786 val |= (u32) data[off - init_off + 2] << 16;
787 val |= (u32) data[off - init_off + 3] << 24;
788 pci_user_write_config_dword(dev, off, val);
789 off += 4;
790 size -= 4;
791 }
792
793 if (size >= 2) {
794 u16 val = data[off - init_off];
795 val |= (u16) data[off - init_off + 1] << 8;
796 pci_user_write_config_word(dev, off, val);
797 off += 2;
798 size -= 2;
799 }
800
801 if (size) {
802 pci_user_write_config_byte(dev, off, data[off - init_off]);
803 off++;
804 --size;
805 }
806
807 pci_config_pm_runtime_put(dev);
808
809 return count;
810}
811static BIN_ATTR(config, 0644, pci_read_config, pci_write_config, 0);
812
813static struct bin_attribute *pci_dev_config_attrs[] = {
814 &bin_attr_config,
815 NULL,
816};
817
818static umode_t pci_dev_config_attr_is_visible(struct kobject *kobj,
819 struct bin_attribute *a, int n)
820{
821 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
822
823 a->size = PCI_CFG_SPACE_SIZE;
824 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
825 a->size = PCI_CFG_SPACE_EXP_SIZE;
826
827 return a->attr.mode;
828}
829
830static const struct attribute_group pci_dev_config_attr_group = {
831 .bin_attrs = pci_dev_config_attrs,
832 .is_bin_visible = pci_dev_config_attr_is_visible,
833};
834
835#ifdef HAVE_PCI_LEGACY
836/**
837 * pci_read_legacy_io - read byte(s) from legacy I/O port space
838 * @filp: open sysfs file
839 * @kobj: kobject corresponding to file to read from
840 * @bin_attr: struct bin_attribute for this file
841 * @buf: buffer to store results
842 * @off: offset into legacy I/O port space
843 * @count: number of bytes to read
844 *
845 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
846 * callback routine (pci_legacy_read).
847 */
848static ssize_t pci_read_legacy_io(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_bus *bus = to_pci_bus(kobj_to_dev(kobj));
853
854 /* Only support 1, 2 or 4 byte accesses */
855 if (count != 1 && count != 2 && count != 4)
856 return -EINVAL;
857
858 return pci_legacy_read(bus, off, (u32 *)buf, count);
859}
860
861/**
862 * pci_write_legacy_io - write byte(s) to legacy I/O port space
863 * @filp: open sysfs file
864 * @kobj: kobject corresponding to file to read from
865 * @bin_attr: struct bin_attribute for this file
866 * @buf: buffer containing value to be written
867 * @off: offset into legacy I/O port space
868 * @count: number of bytes to write
869 *
870 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
871 * callback routine (pci_legacy_write).
872 */
873static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
874 struct bin_attribute *bin_attr, char *buf,
875 loff_t off, size_t count)
876{
877 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
878
879 /* Only support 1, 2 or 4 byte accesses */
880 if (count != 1 && count != 2 && count != 4)
881 return -EINVAL;
882
883 return pci_legacy_write(bus, off, *(u32 *)buf, count);
884}
885
886/**
887 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
888 * @filp: open sysfs file
889 * @kobj: kobject corresponding to device to be mapped
890 * @attr: struct bin_attribute for this file
891 * @vma: struct vm_area_struct passed to mmap
892 *
893 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
894 * legacy memory space (first meg of bus space) into application virtual
895 * memory space.
896 */
897static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
898 struct bin_attribute *attr,
899 struct vm_area_struct *vma)
900{
901 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
902
903 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
904}
905
906/**
907 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
908 * @filp: open sysfs file
909 * @kobj: kobject corresponding to device to be mapped
910 * @attr: struct bin_attribute for this file
911 * @vma: struct vm_area_struct passed to mmap
912 *
913 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
914 * legacy IO space (first meg of bus space) into application virtual
915 * memory space. Returns -ENOSYS if the operation isn't supported
916 */
917static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
918 struct bin_attribute *attr,
919 struct vm_area_struct *vma)
920{
921 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
922
923 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
924}
925
926/**
927 * pci_adjust_legacy_attr - adjustment of legacy file attributes
928 * @b: bus to create files under
929 * @mmap_type: I/O port or memory
930 *
931 * Stub implementation. Can be overridden by arch if necessary.
932 */
933void __weak pci_adjust_legacy_attr(struct pci_bus *b,
934 enum pci_mmap_state mmap_type)
935{
936}
937
938/**
939 * pci_create_legacy_files - create legacy I/O port and memory files
940 * @b: bus to create files under
941 *
942 * Some platforms allow access to legacy I/O port and ISA memory space on
943 * a per-bus basis. This routine creates the files and ties them into
944 * their associated read, write and mmap files from pci-sysfs.c
945 *
946 * On error unwind, but don't propagate the error to the caller
947 * as it is ok to set up the PCI bus without these files.
948 */
949void pci_create_legacy_files(struct pci_bus *b)
950{
951 int error;
952
953 if (!sysfs_initialized)
954 return;
955
956 b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
957 GFP_ATOMIC);
958 if (!b->legacy_io)
959 goto kzalloc_err;
960
961 sysfs_bin_attr_init(b->legacy_io);
962 b->legacy_io->attr.name = "legacy_io";
963 b->legacy_io->size = 0xffff;
964 b->legacy_io->attr.mode = 0600;
965 b->legacy_io->read = pci_read_legacy_io;
966 b->legacy_io->write = pci_write_legacy_io;
967 b->legacy_io->mmap = pci_mmap_legacy_io;
968 b->legacy_io->mapping = iomem_get_mapping();
969 pci_adjust_legacy_attr(b, pci_mmap_io);
970 error = device_create_bin_file(&b->dev, b->legacy_io);
971 if (error)
972 goto legacy_io_err;
973
974 /* Allocated above after the legacy_io struct */
975 b->legacy_mem = b->legacy_io + 1;
976 sysfs_bin_attr_init(b->legacy_mem);
977 b->legacy_mem->attr.name = "legacy_mem";
978 b->legacy_mem->size = 1024*1024;
979 b->legacy_mem->attr.mode = 0600;
980 b->legacy_mem->mmap = pci_mmap_legacy_mem;
981 b->legacy_mem->mapping = iomem_get_mapping();
982 pci_adjust_legacy_attr(b, pci_mmap_mem);
983 error = device_create_bin_file(&b->dev, b->legacy_mem);
984 if (error)
985 goto legacy_mem_err;
986
987 return;
988
989legacy_mem_err:
990 device_remove_bin_file(&b->dev, b->legacy_io);
991legacy_io_err:
992 kfree(b->legacy_io);
993 b->legacy_io = NULL;
994kzalloc_err:
995 dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n");
996}
997
998void pci_remove_legacy_files(struct pci_bus *b)
999{
1000 if (b->legacy_io) {
1001 device_remove_bin_file(&b->dev, b->legacy_io);
1002 device_remove_bin_file(&b->dev, b->legacy_mem);
1003 kfree(b->legacy_io); /* both are allocated here */
1004 }
1005}
1006#endif /* HAVE_PCI_LEGACY */
1007
1008#if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
1009
1010int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
1011 enum pci_mmap_api mmap_api)
1012{
1013 unsigned long nr, start, size;
1014 resource_size_t pci_start = 0, pci_end;
1015
1016 if (pci_resource_len(pdev, resno) == 0)
1017 return 0;
1018 nr = vma_pages(vma);
1019 start = vma->vm_pgoff;
1020 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
1021 if (mmap_api == PCI_MMAP_PROCFS) {
1022 pci_resource_to_user(pdev, resno, &pdev->resource[resno],
1023 &pci_start, &pci_end);
1024 pci_start >>= PAGE_SHIFT;
1025 }
1026 if (start >= pci_start && start < pci_start + size &&
1027 start + nr <= pci_start + size)
1028 return 1;
1029 return 0;
1030}
1031
1032/**
1033 * pci_mmap_resource - map a PCI resource into user memory space
1034 * @kobj: kobject for mapping
1035 * @attr: struct bin_attribute for the file being mapped
1036 * @vma: struct vm_area_struct passed into the mmap
1037 * @write_combine: 1 for write_combine mapping
1038 *
1039 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1040 */
1041static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1042 struct vm_area_struct *vma, int write_combine)
1043{
1044 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1045 int bar = (unsigned long)attr->private;
1046 enum pci_mmap_state mmap_type;
1047 struct resource *res = &pdev->resource[bar];
1048 int ret;
1049
1050 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1051 if (ret)
1052 return ret;
1053
1054 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1055 return -EINVAL;
1056
1057 if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1058 return -EINVAL;
1059
1060 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1061
1062 return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1063}
1064
1065static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1066 struct bin_attribute *attr,
1067 struct vm_area_struct *vma)
1068{
1069 return pci_mmap_resource(kobj, attr, vma, 0);
1070}
1071
1072static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1073 struct bin_attribute *attr,
1074 struct vm_area_struct *vma)
1075{
1076 return pci_mmap_resource(kobj, attr, vma, 1);
1077}
1078
1079static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1080 struct bin_attribute *attr, char *buf,
1081 loff_t off, size_t count, bool write)
1082{
1083 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1084 int bar = (unsigned long)attr->private;
1085 unsigned long port = off;
1086
1087 port += pci_resource_start(pdev, bar);
1088
1089 if (port > pci_resource_end(pdev, bar))
1090 return 0;
1091
1092 if (port + count - 1 > pci_resource_end(pdev, bar))
1093 return -EINVAL;
1094
1095 switch (count) {
1096 case 1:
1097 if (write)
1098 outb(*(u8 *)buf, port);
1099 else
1100 *(u8 *)buf = inb(port);
1101 return 1;
1102 case 2:
1103 if (write)
1104 outw(*(u16 *)buf, port);
1105 else
1106 *(u16 *)buf = inw(port);
1107 return 2;
1108 case 4:
1109 if (write)
1110 outl(*(u32 *)buf, port);
1111 else
1112 *(u32 *)buf = inl(port);
1113 return 4;
1114 }
1115 return -EINVAL;
1116}
1117
1118static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1119 struct bin_attribute *attr, char *buf,
1120 loff_t off, size_t count)
1121{
1122 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1123}
1124
1125static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1126 struct bin_attribute *attr, char *buf,
1127 loff_t off, size_t count)
1128{
1129 int ret;
1130
1131 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1132 if (ret)
1133 return ret;
1134
1135 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1136}
1137
1138/**
1139 * pci_remove_resource_files - cleanup resource files
1140 * @pdev: dev to cleanup
1141 *
1142 * If we created resource files for @pdev, remove them from sysfs and
1143 * free their resources.
1144 */
1145static void pci_remove_resource_files(struct pci_dev *pdev)
1146{
1147 int i;
1148
1149 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1150 struct bin_attribute *res_attr;
1151
1152 res_attr = pdev->res_attr[i];
1153 if (res_attr) {
1154 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1155 kfree(res_attr);
1156 }
1157
1158 res_attr = pdev->res_attr_wc[i];
1159 if (res_attr) {
1160 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1161 kfree(res_attr);
1162 }
1163 }
1164}
1165
1166static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1167{
1168 /* allocate attribute structure, piggyback attribute name */
1169 int name_len = write_combine ? 13 : 10;
1170 struct bin_attribute *res_attr;
1171 char *res_attr_name;
1172 int retval;
1173
1174 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1175 if (!res_attr)
1176 return -ENOMEM;
1177
1178 res_attr_name = (char *)(res_attr + 1);
1179
1180 sysfs_bin_attr_init(res_attr);
1181 if (write_combine) {
1182 pdev->res_attr_wc[num] = res_attr;
1183 sprintf(res_attr_name, "resource%d_wc", num);
1184 res_attr->mmap = pci_mmap_resource_wc;
1185 } else {
1186 pdev->res_attr[num] = res_attr;
1187 sprintf(res_attr_name, "resource%d", num);
1188 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1189 res_attr->read = pci_read_resource_io;
1190 res_attr->write = pci_write_resource_io;
1191 if (arch_can_pci_mmap_io())
1192 res_attr->mmap = pci_mmap_resource_uc;
1193 } else {
1194 res_attr->mmap = pci_mmap_resource_uc;
1195 }
1196 }
1197 if (res_attr->mmap)
1198 res_attr->mapping = iomem_get_mapping();
1199 res_attr->attr.name = res_attr_name;
1200 res_attr->attr.mode = 0600;
1201 res_attr->size = pci_resource_len(pdev, num);
1202 res_attr->private = (void *)(unsigned long)num;
1203 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1204 if (retval)
1205 kfree(res_attr);
1206
1207 return retval;
1208}
1209
1210/**
1211 * pci_create_resource_files - create resource files in sysfs for @dev
1212 * @pdev: dev in question
1213 *
1214 * Walk the resources in @pdev creating files for each resource available.
1215 */
1216static int pci_create_resource_files(struct pci_dev *pdev)
1217{
1218 int i;
1219 int retval;
1220
1221 /* Expose the PCI resources from this device as files */
1222 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1223
1224 /* skip empty resources */
1225 if (!pci_resource_len(pdev, i))
1226 continue;
1227
1228 retval = pci_create_attr(pdev, i, 0);
1229 /* for prefetchable resources, create a WC mappable file */
1230 if (!retval && arch_can_pci_mmap_wc() &&
1231 pdev->resource[i].flags & IORESOURCE_PREFETCH)
1232 retval = pci_create_attr(pdev, i, 1);
1233 if (retval) {
1234 pci_remove_resource_files(pdev);
1235 return retval;
1236 }
1237 }
1238 return 0;
1239}
1240#else /* !(defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)) */
1241int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1242void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1243#endif
1244
1245/**
1246 * pci_write_rom - used to enable access to the PCI ROM display
1247 * @filp: sysfs file
1248 * @kobj: kernel object handle
1249 * @bin_attr: struct bin_attribute for this file
1250 * @buf: user input
1251 * @off: file offset
1252 * @count: number of byte in input
1253 *
1254 * writing anything except 0 enables it
1255 */
1256static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1257 struct bin_attribute *bin_attr, char *buf,
1258 loff_t off, size_t count)
1259{
1260 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1261
1262 if ((off == 0) && (*buf == '0') && (count == 2))
1263 pdev->rom_attr_enabled = 0;
1264 else
1265 pdev->rom_attr_enabled = 1;
1266
1267 return count;
1268}
1269
1270/**
1271 * pci_read_rom - read a PCI ROM
1272 * @filp: sysfs file
1273 * @kobj: kernel object handle
1274 * @bin_attr: struct bin_attribute for this file
1275 * @buf: where to put the data we read from the ROM
1276 * @off: file offset
1277 * @count: number of bytes to read
1278 *
1279 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1280 * device corresponding to @kobj.
1281 */
1282static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1283 struct bin_attribute *bin_attr, char *buf,
1284 loff_t off, size_t count)
1285{
1286 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1287 void __iomem *rom;
1288 size_t size;
1289
1290 if (!pdev->rom_attr_enabled)
1291 return -EINVAL;
1292
1293 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1294 if (!rom || !size)
1295 return -EIO;
1296
1297 if (off >= size)
1298 count = 0;
1299 else {
1300 if (off + count > size)
1301 count = size - off;
1302
1303 memcpy_fromio(buf, rom + off, count);
1304 }
1305 pci_unmap_rom(pdev, rom);
1306
1307 return count;
1308}
1309static BIN_ATTR(rom, 0600, pci_read_rom, pci_write_rom, 0);
1310
1311static struct bin_attribute *pci_dev_rom_attrs[] = {
1312 &bin_attr_rom,
1313 NULL,
1314};
1315
1316static umode_t pci_dev_rom_attr_is_visible(struct kobject *kobj,
1317 struct bin_attribute *a, int n)
1318{
1319 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1320 size_t rom_size;
1321
1322 /* If the device has a ROM, try to expose it in sysfs. */
1323 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1324 if (!rom_size)
1325 return 0;
1326
1327 a->size = rom_size;
1328
1329 return a->attr.mode;
1330}
1331
1332static const struct attribute_group pci_dev_rom_attr_group = {
1333 .bin_attrs = pci_dev_rom_attrs,
1334 .is_bin_visible = pci_dev_rom_attr_is_visible,
1335};
1336
1337static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1338 const char *buf, size_t count)
1339{
1340 struct pci_dev *pdev = to_pci_dev(dev);
1341 unsigned long val;
1342 ssize_t result = kstrtoul(buf, 0, &val);
1343
1344 if (result < 0)
1345 return result;
1346
1347 if (val != 1)
1348 return -EINVAL;
1349
1350 pm_runtime_get_sync(dev);
1351 result = pci_reset_function(pdev);
1352 pm_runtime_put(dev);
1353 if (result < 0)
1354 return result;
1355
1356 return count;
1357}
1358static DEVICE_ATTR_WO(reset);
1359
1360static struct attribute *pci_dev_reset_attrs[] = {
1361 &dev_attr_reset.attr,
1362 NULL,
1363};
1364
1365static umode_t pci_dev_reset_attr_is_visible(struct kobject *kobj,
1366 struct attribute *a, int n)
1367{
1368 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1369
1370 if (!pdev->reset_fn)
1371 return 0;
1372
1373 return a->mode;
1374}
1375
1376static const struct attribute_group pci_dev_reset_attr_group = {
1377 .attrs = pci_dev_reset_attrs,
1378 .is_visible = pci_dev_reset_attr_is_visible,
1379};
1380
1381int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1382{
1383 if (!sysfs_initialized)
1384 return -EACCES;
1385
1386 return pci_create_resource_files(pdev);
1387}
1388
1389/**
1390 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1391 * @pdev: device whose entries we should free
1392 *
1393 * Cleanup when @pdev is removed from sysfs.
1394 */
1395void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1396{
1397 if (!sysfs_initialized)
1398 return;
1399
1400 pci_remove_resource_files(pdev);
1401}
1402
1403static int __init pci_sysfs_init(void)
1404{
1405 struct pci_dev *pdev = NULL;
1406 struct pci_bus *pbus = NULL;
1407 int retval;
1408
1409 sysfs_initialized = 1;
1410 for_each_pci_dev(pdev) {
1411 retval = pci_create_sysfs_dev_files(pdev);
1412 if (retval) {
1413 pci_dev_put(pdev);
1414 return retval;
1415 }
1416 }
1417
1418 while ((pbus = pci_find_next_bus(pbus)))
1419 pci_create_legacy_files(pbus);
1420
1421 return 0;
1422}
1423late_initcall(pci_sysfs_init);
1424
1425static struct attribute *pci_dev_dev_attrs[] = {
1426 &dev_attr_boot_vga.attr,
1427 NULL,
1428};
1429
1430static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1431 struct attribute *a, int n)
1432{
1433 struct device *dev = kobj_to_dev(kobj);
1434 struct pci_dev *pdev = to_pci_dev(dev);
1435
1436 if (a == &dev_attr_boot_vga.attr)
1437 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1438 return 0;
1439
1440 return a->mode;
1441}
1442
1443static struct attribute *pci_dev_hp_attrs[] = {
1444 &dev_attr_remove.attr,
1445 &dev_attr_dev_rescan.attr,
1446 NULL,
1447};
1448
1449static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1450 struct attribute *a, int n)
1451{
1452 struct device *dev = kobj_to_dev(kobj);
1453 struct pci_dev *pdev = to_pci_dev(dev);
1454
1455 if (pdev->is_virtfn)
1456 return 0;
1457
1458 return a->mode;
1459}
1460
1461static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1462 struct attribute *a, int n)
1463{
1464 struct device *dev = kobj_to_dev(kobj);
1465 struct pci_dev *pdev = to_pci_dev(dev);
1466
1467 if (pci_is_bridge(pdev))
1468 return a->mode;
1469
1470 return 0;
1471}
1472
1473static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1474 struct attribute *a, int n)
1475{
1476 struct device *dev = kobj_to_dev(kobj);
1477 struct pci_dev *pdev = to_pci_dev(dev);
1478
1479 if (pci_is_pcie(pdev))
1480 return a->mode;
1481
1482 return 0;
1483}
1484
1485static const struct attribute_group pci_dev_group = {
1486 .attrs = pci_dev_attrs,
1487};
1488
1489const struct attribute_group *pci_dev_groups[] = {
1490 &pci_dev_group,
1491 &pci_dev_config_attr_group,
1492 &pci_dev_rom_attr_group,
1493 &pci_dev_reset_attr_group,
1494 &pci_dev_vpd_attr_group,
1495#ifdef CONFIG_DMI
1496 &pci_dev_smbios_attr_group,
1497#endif
1498#ifdef CONFIG_ACPI
1499 &pci_dev_acpi_attr_group,
1500#endif
1501 NULL,
1502};
1503
1504static const struct attribute_group pci_dev_hp_attr_group = {
1505 .attrs = pci_dev_hp_attrs,
1506 .is_visible = pci_dev_hp_attrs_are_visible,
1507};
1508
1509static const struct attribute_group pci_dev_attr_group = {
1510 .attrs = pci_dev_dev_attrs,
1511 .is_visible = pci_dev_attrs_are_visible,
1512};
1513
1514static const struct attribute_group pci_bridge_attr_group = {
1515 .attrs = pci_bridge_attrs,
1516 .is_visible = pci_bridge_attrs_are_visible,
1517};
1518
1519static const struct attribute_group pcie_dev_attr_group = {
1520 .attrs = pcie_dev_attrs,
1521 .is_visible = pcie_dev_attrs_are_visible,
1522};
1523
1524static const struct attribute_group *pci_dev_attr_groups[] = {
1525 &pci_dev_attr_group,
1526 &pci_dev_hp_attr_group,
1527#ifdef CONFIG_PCI_IOV
1528 &sriov_pf_dev_attr_group,
1529 &sriov_vf_dev_attr_group,
1530#endif
1531 &pci_bridge_attr_group,
1532 &pcie_dev_attr_group,
1533#ifdef CONFIG_PCIEAER
1534 &aer_stats_attr_group,
1535#endif
1536#ifdef CONFIG_PCIEASPM
1537 &aspm_ctrl_attr_group,
1538#endif
1539 NULL,
1540};
1541
1542const struct device_type pci_dev_type = {
1543 .groups = pci_dev_attr_groups,
1544};