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