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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/*
2 * drivers/pci/pci-sysfs.c
3 *
4 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
5 * (C) Copyright 2002-2004 IBM Corp.
6 * (C) Copyright 2003 Matthew Wilcox
7 * (C) Copyright 2003 Hewlett-Packard
8 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
9 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
10 *
11 * File attributes for PCI devices
12 *
13 * Modeled after usb's driverfs.c
14 *
15 */
16
17
18#include <linux/kernel.h>
19#include <linux/sched.h>
20#include <linux/pci.h>
21#include <linux/stat.h>
22#include <linux/export.h>
23#include <linux/topology.h>
24#include <linux/mm.h>
25#include <linux/fs.h>
26#include <linux/capability.h>
27#include <linux/security.h>
28#include <linux/pci-aspm.h>
29#include <linux/slab.h>
30#include <linux/vgaarb.h>
31#include <linux/pm_runtime.h>
32#include <linux/of.h>
33#include "pci.h"
34
35static int sysfs_initialized; /* = 0 */
36
37/* show configuration fields */
38#define pci_config_attr(field, format_string) \
39static ssize_t \
40field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
41{ \
42 struct pci_dev *pdev; \
43 \
44 pdev = to_pci_dev(dev); \
45 return sprintf(buf, format_string, pdev->field); \
46} \
47static DEVICE_ATTR_RO(field)
48
49pci_config_attr(vendor, "0x%04x\n");
50pci_config_attr(device, "0x%04x\n");
51pci_config_attr(subsystem_vendor, "0x%04x\n");
52pci_config_attr(subsystem_device, "0x%04x\n");
53pci_config_attr(class, "0x%06x\n");
54pci_config_attr(irq, "%u\n");
55
56static ssize_t broken_parity_status_show(struct device *dev,
57 struct device_attribute *attr,
58 char *buf)
59{
60 struct pci_dev *pdev = to_pci_dev(dev);
61 return sprintf(buf, "%u\n", pdev->broken_parity_status);
62}
63
64static ssize_t broken_parity_status_store(struct device *dev,
65 struct device_attribute *attr,
66 const char *buf, size_t count)
67{
68 struct pci_dev *pdev = to_pci_dev(dev);
69 unsigned long val;
70
71 if (kstrtoul(buf, 0, &val) < 0)
72 return -EINVAL;
73
74 pdev->broken_parity_status = !!val;
75
76 return count;
77}
78static DEVICE_ATTR_RW(broken_parity_status);
79
80static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
81 struct device_attribute *attr, char *buf)
82{
83 const struct cpumask *mask;
84
85#ifdef CONFIG_NUMA
86 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
87 cpumask_of_node(dev_to_node(dev));
88#else
89 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
90#endif
91 return cpumap_print_to_pagebuf(list, buf, mask);
92}
93
94static ssize_t local_cpus_show(struct device *dev,
95 struct device_attribute *attr, char *buf)
96{
97 return pci_dev_show_local_cpu(dev, false, attr, buf);
98}
99static DEVICE_ATTR_RO(local_cpus);
100
101static ssize_t local_cpulist_show(struct device *dev,
102 struct device_attribute *attr, char *buf)
103{
104 return pci_dev_show_local_cpu(dev, true, attr, buf);
105}
106static DEVICE_ATTR_RO(local_cpulist);
107
108/*
109 * PCI Bus Class Devices
110 */
111static ssize_t cpuaffinity_show(struct device *dev,
112 struct device_attribute *attr, char *buf)
113{
114 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
115
116 return cpumap_print_to_pagebuf(false, buf, cpumask);
117}
118static DEVICE_ATTR_RO(cpuaffinity);
119
120static ssize_t cpulistaffinity_show(struct device *dev,
121 struct device_attribute *attr, char *buf)
122{
123 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
124
125 return cpumap_print_to_pagebuf(true, buf, cpumask);
126}
127static DEVICE_ATTR_RO(cpulistaffinity);
128
129/* show resources */
130static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
131 char *buf)
132{
133 struct pci_dev *pci_dev = to_pci_dev(dev);
134 char *str = buf;
135 int i;
136 int max;
137 resource_size_t start, end;
138
139 if (pci_dev->subordinate)
140 max = DEVICE_COUNT_RESOURCE;
141 else
142 max = PCI_BRIDGE_RESOURCES;
143
144 for (i = 0; i < max; i++) {
145 struct resource *res = &pci_dev->resource[i];
146 pci_resource_to_user(pci_dev, i, res, &start, &end);
147 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
148 (unsigned long long)start,
149 (unsigned long long)end,
150 (unsigned long long)res->flags);
151 }
152 return (str - buf);
153}
154static DEVICE_ATTR_RO(resource);
155
156static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
157 char *buf)
158{
159 struct pci_dev *pci_dev = to_pci_dev(dev);
160
161 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
162 pci_dev->vendor, pci_dev->device,
163 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
164 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
165 (u8)(pci_dev->class));
166}
167static DEVICE_ATTR_RO(modalias);
168
169static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
170 const char *buf, size_t count)
171{
172 struct pci_dev *pdev = to_pci_dev(dev);
173 unsigned long val;
174 ssize_t result = kstrtoul(buf, 0, &val);
175
176 if (result < 0)
177 return result;
178
179 /* this can crash the machine when done on the "wrong" device */
180 if (!capable(CAP_SYS_ADMIN))
181 return -EPERM;
182
183 if (!val) {
184 if (pci_is_enabled(pdev))
185 pci_disable_device(pdev);
186 else
187 result = -EIO;
188 } else
189 result = pci_enable_device(pdev);
190
191 return result < 0 ? result : count;
192}
193
194static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
195 char *buf)
196{
197 struct pci_dev *pdev;
198
199 pdev = to_pci_dev(dev);
200 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
201}
202static DEVICE_ATTR_RW(enable);
203
204#ifdef CONFIG_NUMA
205static ssize_t numa_node_store(struct device *dev,
206 struct device_attribute *attr, const char *buf,
207 size_t count)
208{
209 struct pci_dev *pdev = to_pci_dev(dev);
210 int node, ret;
211
212 if (!capable(CAP_SYS_ADMIN))
213 return -EPERM;
214
215 ret = kstrtoint(buf, 0, &node);
216 if (ret)
217 return ret;
218
219 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
220 return -EINVAL;
221
222 if (node != NUMA_NO_NODE && !node_online(node))
223 return -EINVAL;
224
225 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
226 dev_alert(&pdev->dev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
227 node);
228
229 dev->numa_node = node;
230 return count;
231}
232
233static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
234 char *buf)
235{
236 return sprintf(buf, "%d\n", dev->numa_node);
237}
238static DEVICE_ATTR_RW(numa_node);
239#endif
240
241static ssize_t dma_mask_bits_show(struct device *dev,
242 struct device_attribute *attr, char *buf)
243{
244 struct pci_dev *pdev = to_pci_dev(dev);
245
246 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
247}
248static DEVICE_ATTR_RO(dma_mask_bits);
249
250static ssize_t consistent_dma_mask_bits_show(struct device *dev,
251 struct device_attribute *attr,
252 char *buf)
253{
254 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
255}
256static DEVICE_ATTR_RO(consistent_dma_mask_bits);
257
258static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
259 char *buf)
260{
261 struct pci_dev *pdev = to_pci_dev(dev);
262 struct pci_bus *subordinate = pdev->subordinate;
263
264 return sprintf(buf, "%u\n", subordinate ?
265 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
266 : !pdev->no_msi);
267}
268
269static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
270 const char *buf, size_t count)
271{
272 struct pci_dev *pdev = to_pci_dev(dev);
273 struct pci_bus *subordinate = pdev->subordinate;
274 unsigned long val;
275
276 if (kstrtoul(buf, 0, &val) < 0)
277 return -EINVAL;
278
279 if (!capable(CAP_SYS_ADMIN))
280 return -EPERM;
281
282 /*
283 * "no_msi" and "bus_flags" only affect what happens when a driver
284 * requests MSI or MSI-X. They don't affect any drivers that have
285 * already requested MSI or MSI-X.
286 */
287 if (!subordinate) {
288 pdev->no_msi = !val;
289 dev_info(&pdev->dev, "MSI/MSI-X %s for future drivers\n",
290 val ? "allowed" : "disallowed");
291 return count;
292 }
293
294 if (val)
295 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
296 else
297 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
298
299 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
300 val ? "allowed" : "disallowed");
301 return count;
302}
303static DEVICE_ATTR_RW(msi_bus);
304
305static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
306 size_t count)
307{
308 unsigned long val;
309 struct pci_bus *b = NULL;
310
311 if (kstrtoul(buf, 0, &val) < 0)
312 return -EINVAL;
313
314 if (val) {
315 pci_lock_rescan_remove();
316 while ((b = pci_find_next_bus(b)) != NULL)
317 pci_rescan_bus(b);
318 pci_unlock_rescan_remove();
319 }
320 return count;
321}
322static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
323
324static struct attribute *pci_bus_attrs[] = {
325 &bus_attr_rescan.attr,
326 NULL,
327};
328
329static const struct attribute_group pci_bus_group = {
330 .attrs = pci_bus_attrs,
331};
332
333const struct attribute_group *pci_bus_groups[] = {
334 &pci_bus_group,
335 NULL,
336};
337
338static ssize_t dev_rescan_store(struct device *dev,
339 struct device_attribute *attr, const char *buf,
340 size_t count)
341{
342 unsigned long val;
343 struct pci_dev *pdev = to_pci_dev(dev);
344
345 if (kstrtoul(buf, 0, &val) < 0)
346 return -EINVAL;
347
348 if (val) {
349 pci_lock_rescan_remove();
350 pci_rescan_bus(pdev->bus);
351 pci_unlock_rescan_remove();
352 }
353 return count;
354}
355static struct device_attribute dev_rescan_attr = __ATTR(rescan,
356 (S_IWUSR|S_IWGRP),
357 NULL, dev_rescan_store);
358
359static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
360 const char *buf, size_t count)
361{
362 unsigned long val;
363
364 if (kstrtoul(buf, 0, &val) < 0)
365 return -EINVAL;
366
367 if (val && device_remove_file_self(dev, attr))
368 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
369 return count;
370}
371static struct device_attribute dev_remove_attr = __ATTR(remove,
372 (S_IWUSR|S_IWGRP),
373 NULL, remove_store);
374
375static ssize_t dev_bus_rescan_store(struct device *dev,
376 struct device_attribute *attr,
377 const char *buf, size_t count)
378{
379 unsigned long val;
380 struct pci_bus *bus = to_pci_bus(dev);
381
382 if (kstrtoul(buf, 0, &val) < 0)
383 return -EINVAL;
384
385 if (val) {
386 pci_lock_rescan_remove();
387 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
388 pci_rescan_bus_bridge_resize(bus->self);
389 else
390 pci_rescan_bus(bus);
391 pci_unlock_rescan_remove();
392 }
393 return count;
394}
395static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
396
397#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
398static ssize_t d3cold_allowed_store(struct device *dev,
399 struct device_attribute *attr,
400 const char *buf, size_t count)
401{
402 struct pci_dev *pdev = to_pci_dev(dev);
403 unsigned long val;
404
405 if (kstrtoul(buf, 0, &val) < 0)
406 return -EINVAL;
407
408 pdev->d3cold_allowed = !!val;
409 pm_runtime_resume(dev);
410
411 return count;
412}
413
414static ssize_t d3cold_allowed_show(struct device *dev,
415 struct device_attribute *attr, char *buf)
416{
417 struct pci_dev *pdev = to_pci_dev(dev);
418 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
419}
420static DEVICE_ATTR_RW(d3cold_allowed);
421#endif
422
423#ifdef CONFIG_OF
424static ssize_t devspec_show(struct device *dev,
425 struct device_attribute *attr, char *buf)
426{
427 struct pci_dev *pdev = to_pci_dev(dev);
428 struct device_node *np = pci_device_to_OF_node(pdev);
429
430 if (np == NULL || np->full_name == NULL)
431 return 0;
432 return sprintf(buf, "%s", np->full_name);
433}
434static DEVICE_ATTR_RO(devspec);
435#endif
436
437#ifdef CONFIG_PCI_IOV
438static ssize_t sriov_totalvfs_show(struct device *dev,
439 struct device_attribute *attr,
440 char *buf)
441{
442 struct pci_dev *pdev = to_pci_dev(dev);
443
444 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
445}
446
447
448static ssize_t sriov_numvfs_show(struct device *dev,
449 struct device_attribute *attr,
450 char *buf)
451{
452 struct pci_dev *pdev = to_pci_dev(dev);
453
454 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
455}
456
457/*
458 * num_vfs > 0; number of VFs to enable
459 * num_vfs = 0; disable all VFs
460 *
461 * Note: SRIOV spec doesn't allow partial VF
462 * disable, so it's all or none.
463 */
464static ssize_t sriov_numvfs_store(struct device *dev,
465 struct device_attribute *attr,
466 const char *buf, size_t count)
467{
468 struct pci_dev *pdev = to_pci_dev(dev);
469 int ret;
470 u16 num_vfs;
471
472 ret = kstrtou16(buf, 0, &num_vfs);
473 if (ret < 0)
474 return ret;
475
476 if (num_vfs > pci_sriov_get_totalvfs(pdev))
477 return -ERANGE;
478
479 if (num_vfs == pdev->sriov->num_VFs)
480 return count; /* no change */
481
482 /* is PF driver loaded w/callback */
483 if (!pdev->driver || !pdev->driver->sriov_configure) {
484 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
485 return -ENOSYS;
486 }
487
488 if (num_vfs == 0) {
489 /* disable VFs */
490 ret = pdev->driver->sriov_configure(pdev, 0);
491 if (ret < 0)
492 return ret;
493 return count;
494 }
495
496 /* enable VFs */
497 if (pdev->sriov->num_VFs) {
498 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
499 pdev->sriov->num_VFs, num_vfs);
500 return -EBUSY;
501 }
502
503 ret = pdev->driver->sriov_configure(pdev, num_vfs);
504 if (ret < 0)
505 return ret;
506
507 if (ret != num_vfs)
508 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
509 num_vfs, ret);
510
511 return count;
512}
513
514static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
515static struct device_attribute sriov_numvfs_attr =
516 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
517 sriov_numvfs_show, sriov_numvfs_store);
518#endif /* CONFIG_PCI_IOV */
519
520static ssize_t driver_override_store(struct device *dev,
521 struct device_attribute *attr,
522 const char *buf, size_t count)
523{
524 struct pci_dev *pdev = to_pci_dev(dev);
525 char *driver_override, *old = pdev->driver_override, *cp;
526
527 /* We need to keep extra room for a newline */
528 if (count >= (PAGE_SIZE - 1))
529 return -EINVAL;
530
531 driver_override = kstrndup(buf, count, GFP_KERNEL);
532 if (!driver_override)
533 return -ENOMEM;
534
535 cp = strchr(driver_override, '\n');
536 if (cp)
537 *cp = '\0';
538
539 if (strlen(driver_override)) {
540 pdev->driver_override = driver_override;
541 } else {
542 kfree(driver_override);
543 pdev->driver_override = NULL;
544 }
545
546 kfree(old);
547
548 return count;
549}
550
551static ssize_t driver_override_show(struct device *dev,
552 struct device_attribute *attr, char *buf)
553{
554 struct pci_dev *pdev = to_pci_dev(dev);
555
556 return snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
557}
558static DEVICE_ATTR_RW(driver_override);
559
560static struct attribute *pci_dev_attrs[] = {
561 &dev_attr_resource.attr,
562 &dev_attr_vendor.attr,
563 &dev_attr_device.attr,
564 &dev_attr_subsystem_vendor.attr,
565 &dev_attr_subsystem_device.attr,
566 &dev_attr_class.attr,
567 &dev_attr_irq.attr,
568 &dev_attr_local_cpus.attr,
569 &dev_attr_local_cpulist.attr,
570 &dev_attr_modalias.attr,
571#ifdef CONFIG_NUMA
572 &dev_attr_numa_node.attr,
573#endif
574 &dev_attr_dma_mask_bits.attr,
575 &dev_attr_consistent_dma_mask_bits.attr,
576 &dev_attr_enable.attr,
577 &dev_attr_broken_parity_status.attr,
578 &dev_attr_msi_bus.attr,
579#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
580 &dev_attr_d3cold_allowed.attr,
581#endif
582#ifdef CONFIG_OF
583 &dev_attr_devspec.attr,
584#endif
585 &dev_attr_driver_override.attr,
586 NULL,
587};
588
589static const struct attribute_group pci_dev_group = {
590 .attrs = pci_dev_attrs,
591};
592
593const struct attribute_group *pci_dev_groups[] = {
594 &pci_dev_group,
595 NULL,
596};
597
598static struct attribute *pcibus_attrs[] = {
599 &dev_attr_rescan.attr,
600 &dev_attr_cpuaffinity.attr,
601 &dev_attr_cpulistaffinity.attr,
602 NULL,
603};
604
605static const struct attribute_group pcibus_group = {
606 .attrs = pcibus_attrs,
607};
608
609const struct attribute_group *pcibus_groups[] = {
610 &pcibus_group,
611 NULL,
612};
613
614static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
615 char *buf)
616{
617 struct pci_dev *pdev = to_pci_dev(dev);
618 struct pci_dev *vga_dev = vga_default_device();
619
620 if (vga_dev)
621 return sprintf(buf, "%u\n", (pdev == vga_dev));
622
623 return sprintf(buf, "%u\n",
624 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
625 IORESOURCE_ROM_SHADOW));
626}
627static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
628
629static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
630 struct bin_attribute *bin_attr, char *buf,
631 loff_t off, size_t count)
632{
633 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
634 unsigned int size = 64;
635 loff_t init_off = off;
636 u8 *data = (u8 *) buf;
637
638 /* Several chips lock up trying to read undefined config space */
639 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
640 size = dev->cfg_size;
641 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
642 size = 128;
643
644 if (off > size)
645 return 0;
646 if (off + count > size) {
647 size -= off;
648 count = size;
649 } else {
650 size = count;
651 }
652
653 pci_config_pm_runtime_get(dev);
654
655 if ((off & 1) && size) {
656 u8 val;
657 pci_user_read_config_byte(dev, off, &val);
658 data[off - init_off] = val;
659 off++;
660 size--;
661 }
662
663 if ((off & 3) && size > 2) {
664 u16 val;
665 pci_user_read_config_word(dev, off, &val);
666 data[off - init_off] = val & 0xff;
667 data[off - init_off + 1] = (val >> 8) & 0xff;
668 off += 2;
669 size -= 2;
670 }
671
672 while (size > 3) {
673 u32 val;
674 pci_user_read_config_dword(dev, off, &val);
675 data[off - init_off] = val & 0xff;
676 data[off - init_off + 1] = (val >> 8) & 0xff;
677 data[off - init_off + 2] = (val >> 16) & 0xff;
678 data[off - init_off + 3] = (val >> 24) & 0xff;
679 off += 4;
680 size -= 4;
681 }
682
683 if (size >= 2) {
684 u16 val;
685 pci_user_read_config_word(dev, off, &val);
686 data[off - init_off] = val & 0xff;
687 data[off - init_off + 1] = (val >> 8) & 0xff;
688 off += 2;
689 size -= 2;
690 }
691
692 if (size > 0) {
693 u8 val;
694 pci_user_read_config_byte(dev, off, &val);
695 data[off - init_off] = val;
696 off++;
697 --size;
698 }
699
700 pci_config_pm_runtime_put(dev);
701
702 return count;
703}
704
705static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
706 struct bin_attribute *bin_attr, char *buf,
707 loff_t off, size_t count)
708{
709 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
710 unsigned int size = count;
711 loff_t init_off = off;
712 u8 *data = (u8 *) buf;
713
714 if (off > dev->cfg_size)
715 return 0;
716 if (off + count > dev->cfg_size) {
717 size = dev->cfg_size - off;
718 count = size;
719 }
720
721 pci_config_pm_runtime_get(dev);
722
723 if ((off & 1) && size) {
724 pci_user_write_config_byte(dev, off, data[off - init_off]);
725 off++;
726 size--;
727 }
728
729 if ((off & 3) && size > 2) {
730 u16 val = data[off - init_off];
731 val |= (u16) data[off - init_off + 1] << 8;
732 pci_user_write_config_word(dev, off, val);
733 off += 2;
734 size -= 2;
735 }
736
737 while (size > 3) {
738 u32 val = data[off - init_off];
739 val |= (u32) data[off - init_off + 1] << 8;
740 val |= (u32) data[off - init_off + 2] << 16;
741 val |= (u32) data[off - init_off + 3] << 24;
742 pci_user_write_config_dword(dev, off, val);
743 off += 4;
744 size -= 4;
745 }
746
747 if (size >= 2) {
748 u16 val = data[off - init_off];
749 val |= (u16) data[off - init_off + 1] << 8;
750 pci_user_write_config_word(dev, off, val);
751 off += 2;
752 size -= 2;
753 }
754
755 if (size) {
756 pci_user_write_config_byte(dev, off, data[off - init_off]);
757 off++;
758 --size;
759 }
760
761 pci_config_pm_runtime_put(dev);
762
763 return count;
764}
765
766static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
767 struct bin_attribute *bin_attr, char *buf,
768 loff_t off, size_t count)
769{
770 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
771
772 if (bin_attr->size > 0) {
773 if (off > bin_attr->size)
774 count = 0;
775 else if (count > bin_attr->size - off)
776 count = bin_attr->size - off;
777 }
778
779 return pci_read_vpd(dev, off, count, buf);
780}
781
782static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
783 struct bin_attribute *bin_attr, char *buf,
784 loff_t off, size_t count)
785{
786 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
787
788 if (bin_attr->size > 0) {
789 if (off > bin_attr->size)
790 count = 0;
791 else if (count > bin_attr->size - off)
792 count = bin_attr->size - off;
793 }
794
795 return pci_write_vpd(dev, off, count, buf);
796}
797
798#ifdef HAVE_PCI_LEGACY
799/**
800 * pci_read_legacy_io - read byte(s) from legacy I/O port space
801 * @filp: open sysfs file
802 * @kobj: kobject corresponding to file to read from
803 * @bin_attr: struct bin_attribute for this file
804 * @buf: buffer to store results
805 * @off: offset into legacy I/O port space
806 * @count: number of bytes to read
807 *
808 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
809 * callback routine (pci_legacy_read).
810 */
811static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
812 struct bin_attribute *bin_attr, char *buf,
813 loff_t off, size_t count)
814{
815 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
816
817 /* Only support 1, 2 or 4 byte accesses */
818 if (count != 1 && count != 2 && count != 4)
819 return -EINVAL;
820
821 return pci_legacy_read(bus, off, (u32 *)buf, count);
822}
823
824/**
825 * pci_write_legacy_io - write byte(s) to legacy I/O port space
826 * @filp: open sysfs file
827 * @kobj: kobject corresponding to file to read from
828 * @bin_attr: struct bin_attribute for this file
829 * @buf: buffer containing value to be written
830 * @off: offset into legacy I/O port space
831 * @count: number of bytes to write
832 *
833 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
834 * callback routine (pci_legacy_write).
835 */
836static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
837 struct bin_attribute *bin_attr, char *buf,
838 loff_t off, size_t count)
839{
840 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
841
842 /* Only support 1, 2 or 4 byte accesses */
843 if (count != 1 && count != 2 && count != 4)
844 return -EINVAL;
845
846 return pci_legacy_write(bus, off, *(u32 *)buf, count);
847}
848
849/**
850 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
851 * @filp: open sysfs file
852 * @kobj: kobject corresponding to device to be mapped
853 * @attr: struct bin_attribute for this file
854 * @vma: struct vm_area_struct passed to mmap
855 *
856 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
857 * legacy memory space (first meg of bus space) into application virtual
858 * memory space.
859 */
860static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
861 struct bin_attribute *attr,
862 struct vm_area_struct *vma)
863{
864 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
865
866 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
867}
868
869/**
870 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
871 * @filp: open sysfs file
872 * @kobj: kobject corresponding to device to be mapped
873 * @attr: struct bin_attribute for this file
874 * @vma: struct vm_area_struct passed to mmap
875 *
876 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
877 * legacy IO space (first meg of bus space) into application virtual
878 * memory space. Returns -ENOSYS if the operation isn't supported
879 */
880static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
881 struct bin_attribute *attr,
882 struct vm_area_struct *vma)
883{
884 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
885
886 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
887}
888
889/**
890 * pci_adjust_legacy_attr - adjustment of legacy file attributes
891 * @b: bus to create files under
892 * @mmap_type: I/O port or memory
893 *
894 * Stub implementation. Can be overridden by arch if necessary.
895 */
896void __weak pci_adjust_legacy_attr(struct pci_bus *b,
897 enum pci_mmap_state mmap_type)
898{
899}
900
901/**
902 * pci_create_legacy_files - create legacy I/O port and memory files
903 * @b: bus to create files under
904 *
905 * Some platforms allow access to legacy I/O port and ISA memory space on
906 * a per-bus basis. This routine creates the files and ties them into
907 * their associated read, write and mmap files from pci-sysfs.c
908 *
909 * On error unwind, but don't propagate the error to the caller
910 * as it is ok to set up the PCI bus without these files.
911 */
912void pci_create_legacy_files(struct pci_bus *b)
913{
914 int error;
915
916 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
917 GFP_ATOMIC);
918 if (!b->legacy_io)
919 goto kzalloc_err;
920
921 sysfs_bin_attr_init(b->legacy_io);
922 b->legacy_io->attr.name = "legacy_io";
923 b->legacy_io->size = 0xffff;
924 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
925 b->legacy_io->read = pci_read_legacy_io;
926 b->legacy_io->write = pci_write_legacy_io;
927 b->legacy_io->mmap = pci_mmap_legacy_io;
928 pci_adjust_legacy_attr(b, pci_mmap_io);
929 error = device_create_bin_file(&b->dev, b->legacy_io);
930 if (error)
931 goto legacy_io_err;
932
933 /* Allocated above after the legacy_io struct */
934 b->legacy_mem = b->legacy_io + 1;
935 sysfs_bin_attr_init(b->legacy_mem);
936 b->legacy_mem->attr.name = "legacy_mem";
937 b->legacy_mem->size = 1024*1024;
938 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
939 b->legacy_mem->mmap = pci_mmap_legacy_mem;
940 pci_adjust_legacy_attr(b, pci_mmap_mem);
941 error = device_create_bin_file(&b->dev, b->legacy_mem);
942 if (error)
943 goto legacy_mem_err;
944
945 return;
946
947legacy_mem_err:
948 device_remove_bin_file(&b->dev, b->legacy_io);
949legacy_io_err:
950 kfree(b->legacy_io);
951 b->legacy_io = NULL;
952kzalloc_err:
953 printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
954 return;
955}
956
957void pci_remove_legacy_files(struct pci_bus *b)
958{
959 if (b->legacy_io) {
960 device_remove_bin_file(&b->dev, b->legacy_io);
961 device_remove_bin_file(&b->dev, b->legacy_mem);
962 kfree(b->legacy_io); /* both are allocated here */
963 }
964}
965#endif /* HAVE_PCI_LEGACY */
966
967#ifdef HAVE_PCI_MMAP
968
969int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
970 enum pci_mmap_api mmap_api)
971{
972 unsigned long nr, start, size, pci_start;
973
974 if (pci_resource_len(pdev, resno) == 0)
975 return 0;
976 nr = vma_pages(vma);
977 start = vma->vm_pgoff;
978 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
979 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
980 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
981 if (start >= pci_start && start < pci_start + size &&
982 start + nr <= pci_start + size)
983 return 1;
984 return 0;
985}
986
987/**
988 * pci_mmap_resource - map a PCI resource into user memory space
989 * @kobj: kobject for mapping
990 * @attr: struct bin_attribute for the file being mapped
991 * @vma: struct vm_area_struct passed into the mmap
992 * @write_combine: 1 for write_combine mapping
993 *
994 * Use the regular PCI mapping routines to map a PCI resource into userspace.
995 */
996static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
997 struct vm_area_struct *vma, int write_combine)
998{
999 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1000 struct resource *res = attr->private;
1001 enum pci_mmap_state mmap_type;
1002 resource_size_t start, end;
1003 int i;
1004
1005 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1006 if (res == &pdev->resource[i])
1007 break;
1008 if (i >= PCI_ROM_RESOURCE)
1009 return -ENODEV;
1010
1011 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
1012 WARN(1, "process \"%s\" tried to map 0x%08lx bytes at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
1013 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
1014 pci_name(pdev), i,
1015 (u64)pci_resource_start(pdev, i),
1016 (u64)pci_resource_len(pdev, i));
1017 return -EINVAL;
1018 }
1019
1020 /* pci_mmap_page_range() expects the same kind of entry as coming
1021 * from /proc/bus/pci/ which is a "user visible" value. If this is
1022 * different from the resource itself, arch will do necessary fixup.
1023 */
1024 pci_resource_to_user(pdev, i, res, &start, &end);
1025 vma->vm_pgoff += start >> PAGE_SHIFT;
1026 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1027
1028 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
1029 return -EINVAL;
1030
1031 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1032}
1033
1034static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1035 struct bin_attribute *attr,
1036 struct vm_area_struct *vma)
1037{
1038 return pci_mmap_resource(kobj, attr, vma, 0);
1039}
1040
1041static int pci_mmap_resource_wc(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, 1);
1046}
1047
1048static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1049 struct bin_attribute *attr, char *buf,
1050 loff_t off, size_t count, bool write)
1051{
1052 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1053 struct resource *res = attr->private;
1054 unsigned long port = off;
1055 int i;
1056
1057 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1058 if (res == &pdev->resource[i])
1059 break;
1060 if (i >= PCI_ROM_RESOURCE)
1061 return -ENODEV;
1062
1063 port += pci_resource_start(pdev, i);
1064
1065 if (port > pci_resource_end(pdev, i))
1066 return 0;
1067
1068 if (port + count - 1 > pci_resource_end(pdev, i))
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 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1106}
1107
1108/**
1109 * pci_remove_resource_files - cleanup resource files
1110 * @pdev: dev to cleanup
1111 *
1112 * If we created resource files for @pdev, remove them from sysfs and
1113 * free their resources.
1114 */
1115static void pci_remove_resource_files(struct pci_dev *pdev)
1116{
1117 int i;
1118
1119 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1120 struct bin_attribute *res_attr;
1121
1122 res_attr = pdev->res_attr[i];
1123 if (res_attr) {
1124 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1125 kfree(res_attr);
1126 }
1127
1128 res_attr = pdev->res_attr_wc[i];
1129 if (res_attr) {
1130 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1131 kfree(res_attr);
1132 }
1133 }
1134}
1135
1136static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1137{
1138 /* allocate attribute structure, piggyback attribute name */
1139 int name_len = write_combine ? 13 : 10;
1140 struct bin_attribute *res_attr;
1141 char *res_attr_name;
1142 int retval;
1143
1144 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1145 if (!res_attr)
1146 return -ENOMEM;
1147
1148 res_attr_name = (char *)(res_attr + 1);
1149
1150 sysfs_bin_attr_init(res_attr);
1151 if (write_combine) {
1152 pdev->res_attr_wc[num] = res_attr;
1153 sprintf(res_attr_name, "resource%d_wc", num);
1154 res_attr->mmap = pci_mmap_resource_wc;
1155 } else {
1156 pdev->res_attr[num] = res_attr;
1157 sprintf(res_attr_name, "resource%d", num);
1158 res_attr->mmap = pci_mmap_resource_uc;
1159 }
1160 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1161 res_attr->read = pci_read_resource_io;
1162 res_attr->write = pci_write_resource_io;
1163 }
1164 res_attr->attr.name = res_attr_name;
1165 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1166 res_attr->size = pci_resource_len(pdev, num);
1167 res_attr->private = &pdev->resource[num];
1168 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1169 if (retval)
1170 kfree(res_attr);
1171
1172 return retval;
1173}
1174
1175/**
1176 * pci_create_resource_files - create resource files in sysfs for @dev
1177 * @pdev: dev in question
1178 *
1179 * Walk the resources in @pdev creating files for each resource available.
1180 */
1181static int pci_create_resource_files(struct pci_dev *pdev)
1182{
1183 int i;
1184 int retval;
1185
1186 /* Expose the PCI resources from this device as files */
1187 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1188
1189 /* skip empty resources */
1190 if (!pci_resource_len(pdev, i))
1191 continue;
1192
1193 retval = pci_create_attr(pdev, i, 0);
1194 /* for prefetchable resources, create a WC mappable file */
1195 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1196 retval = pci_create_attr(pdev, i, 1);
1197
1198 if (retval) {
1199 pci_remove_resource_files(pdev);
1200 return retval;
1201 }
1202 }
1203 return 0;
1204}
1205#else /* !HAVE_PCI_MMAP */
1206int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1207void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1208#endif /* HAVE_PCI_MMAP */
1209
1210/**
1211 * pci_write_rom - used to enable access to the PCI ROM display
1212 * @filp: sysfs file
1213 * @kobj: kernel object handle
1214 * @bin_attr: struct bin_attribute for this file
1215 * @buf: user input
1216 * @off: file offset
1217 * @count: number of byte in input
1218 *
1219 * writing anything except 0 enables it
1220 */
1221static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1222 struct bin_attribute *bin_attr, char *buf,
1223 loff_t off, size_t count)
1224{
1225 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1226
1227 if ((off == 0) && (*buf == '0') && (count == 2))
1228 pdev->rom_attr_enabled = 0;
1229 else
1230 pdev->rom_attr_enabled = 1;
1231
1232 return count;
1233}
1234
1235/**
1236 * pci_read_rom - read a PCI ROM
1237 * @filp: sysfs file
1238 * @kobj: kernel object handle
1239 * @bin_attr: struct bin_attribute for this file
1240 * @buf: where to put the data we read from the ROM
1241 * @off: file offset
1242 * @count: number of bytes to read
1243 *
1244 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1245 * device corresponding to @kobj.
1246 */
1247static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1248 struct bin_attribute *bin_attr, char *buf,
1249 loff_t off, size_t count)
1250{
1251 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1252 void __iomem *rom;
1253 size_t size;
1254
1255 if (!pdev->rom_attr_enabled)
1256 return -EINVAL;
1257
1258 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1259 if (!rom || !size)
1260 return -EIO;
1261
1262 if (off >= size)
1263 count = 0;
1264 else {
1265 if (off + count > size)
1266 count = size - off;
1267
1268 memcpy_fromio(buf, rom + off, count);
1269 }
1270 pci_unmap_rom(pdev, rom);
1271
1272 return count;
1273}
1274
1275static struct bin_attribute pci_config_attr = {
1276 .attr = {
1277 .name = "config",
1278 .mode = S_IRUGO | S_IWUSR,
1279 },
1280 .size = PCI_CFG_SPACE_SIZE,
1281 .read = pci_read_config,
1282 .write = pci_write_config,
1283};
1284
1285static struct bin_attribute pcie_config_attr = {
1286 .attr = {
1287 .name = "config",
1288 .mode = S_IRUGO | S_IWUSR,
1289 },
1290 .size = PCI_CFG_SPACE_EXP_SIZE,
1291 .read = pci_read_config,
1292 .write = pci_write_config,
1293};
1294
1295static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1296 const char *buf, size_t count)
1297{
1298 struct pci_dev *pdev = to_pci_dev(dev);
1299 unsigned long val;
1300 ssize_t result = kstrtoul(buf, 0, &val);
1301
1302 if (result < 0)
1303 return result;
1304
1305 if (val != 1)
1306 return -EINVAL;
1307
1308 result = pci_reset_function(pdev);
1309 if (result < 0)
1310 return result;
1311
1312 return count;
1313}
1314
1315static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1316
1317static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1318{
1319 int retval;
1320 struct bin_attribute *attr;
1321
1322 /* If the device has VPD, try to expose it in sysfs. */
1323 if (dev->vpd) {
1324 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1325 if (!attr)
1326 return -ENOMEM;
1327
1328 sysfs_bin_attr_init(attr);
1329 attr->size = 0;
1330 attr->attr.name = "vpd";
1331 attr->attr.mode = S_IRUSR | S_IWUSR;
1332 attr->read = read_vpd_attr;
1333 attr->write = write_vpd_attr;
1334 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1335 if (retval) {
1336 kfree(attr);
1337 return retval;
1338 }
1339 dev->vpd->attr = attr;
1340 }
1341
1342 /* Active State Power Management */
1343 pcie_aspm_create_sysfs_dev_files(dev);
1344
1345 if (!pci_probe_reset_function(dev)) {
1346 retval = device_create_file(&dev->dev, &reset_attr);
1347 if (retval)
1348 goto error;
1349 dev->reset_fn = 1;
1350 }
1351 return 0;
1352
1353error:
1354 pcie_aspm_remove_sysfs_dev_files(dev);
1355 if (dev->vpd && dev->vpd->attr) {
1356 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1357 kfree(dev->vpd->attr);
1358 }
1359
1360 return retval;
1361}
1362
1363int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1364{
1365 int retval;
1366 int rom_size;
1367 struct bin_attribute *attr;
1368
1369 if (!sysfs_initialized)
1370 return -EACCES;
1371
1372 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1373 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1374 else
1375 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1376 if (retval)
1377 goto err;
1378
1379 retval = pci_create_resource_files(pdev);
1380 if (retval)
1381 goto err_config_file;
1382
1383 /* If the device has a ROM, try to expose it in sysfs. */
1384 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1385 if (rom_size) {
1386 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1387 if (!attr) {
1388 retval = -ENOMEM;
1389 goto err_resource_files;
1390 }
1391 sysfs_bin_attr_init(attr);
1392 attr->size = rom_size;
1393 attr->attr.name = "rom";
1394 attr->attr.mode = S_IRUSR | S_IWUSR;
1395 attr->read = pci_read_rom;
1396 attr->write = pci_write_rom;
1397 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1398 if (retval) {
1399 kfree(attr);
1400 goto err_resource_files;
1401 }
1402 pdev->rom_attr = attr;
1403 }
1404
1405 /* add sysfs entries for various capabilities */
1406 retval = pci_create_capabilities_sysfs(pdev);
1407 if (retval)
1408 goto err_rom_file;
1409
1410 pci_create_firmware_label_files(pdev);
1411
1412 return 0;
1413
1414err_rom_file:
1415 if (pdev->rom_attr) {
1416 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1417 kfree(pdev->rom_attr);
1418 pdev->rom_attr = NULL;
1419 }
1420err_resource_files:
1421 pci_remove_resource_files(pdev);
1422err_config_file:
1423 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1424 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1425 else
1426 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1427err:
1428 return retval;
1429}
1430
1431static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1432{
1433 if (dev->vpd && dev->vpd->attr) {
1434 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1435 kfree(dev->vpd->attr);
1436 }
1437
1438 pcie_aspm_remove_sysfs_dev_files(dev);
1439 if (dev->reset_fn) {
1440 device_remove_file(&dev->dev, &reset_attr);
1441 dev->reset_fn = 0;
1442 }
1443}
1444
1445/**
1446 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1447 * @pdev: device whose entries we should free
1448 *
1449 * Cleanup when @pdev is removed from sysfs.
1450 */
1451void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1452{
1453 if (!sysfs_initialized)
1454 return;
1455
1456 pci_remove_capabilities_sysfs(pdev);
1457
1458 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1459 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1460 else
1461 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1462
1463 pci_remove_resource_files(pdev);
1464
1465 if (pdev->rom_attr) {
1466 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1467 kfree(pdev->rom_attr);
1468 pdev->rom_attr = NULL;
1469 }
1470
1471 pci_remove_firmware_label_files(pdev);
1472}
1473
1474static int __init pci_sysfs_init(void)
1475{
1476 struct pci_dev *pdev = NULL;
1477 int retval;
1478
1479 sysfs_initialized = 1;
1480 for_each_pci_dev(pdev) {
1481 retval = pci_create_sysfs_dev_files(pdev);
1482 if (retval) {
1483 pci_dev_put(pdev);
1484 return retval;
1485 }
1486 }
1487
1488 return 0;
1489}
1490late_initcall(pci_sysfs_init);
1491
1492static struct attribute *pci_dev_dev_attrs[] = {
1493 &vga_attr.attr,
1494 NULL,
1495};
1496
1497static umode_t pci_dev_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 (a == &vga_attr.attr)
1504 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1505 return 0;
1506
1507 return a->mode;
1508}
1509
1510static struct attribute *pci_dev_hp_attrs[] = {
1511 &dev_remove_attr.attr,
1512 &dev_rescan_attr.attr,
1513 NULL,
1514};
1515
1516static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1517 struct attribute *a, int n)
1518{
1519 struct device *dev = kobj_to_dev(kobj);
1520 struct pci_dev *pdev = to_pci_dev(dev);
1521
1522 if (pdev->is_virtfn)
1523 return 0;
1524
1525 return a->mode;
1526}
1527
1528static struct attribute_group pci_dev_hp_attr_group = {
1529 .attrs = pci_dev_hp_attrs,
1530 .is_visible = pci_dev_hp_attrs_are_visible,
1531};
1532
1533#ifdef CONFIG_PCI_IOV
1534static struct attribute *sriov_dev_attrs[] = {
1535 &sriov_totalvfs_attr.attr,
1536 &sriov_numvfs_attr.attr,
1537 NULL,
1538};
1539
1540static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1541 struct attribute *a, int n)
1542{
1543 struct device *dev = kobj_to_dev(kobj);
1544
1545 if (!dev_is_pf(dev))
1546 return 0;
1547
1548 return a->mode;
1549}
1550
1551static struct attribute_group sriov_dev_attr_group = {
1552 .attrs = sriov_dev_attrs,
1553 .is_visible = sriov_attrs_are_visible,
1554};
1555#endif /* CONFIG_PCI_IOV */
1556
1557static struct attribute_group pci_dev_attr_group = {
1558 .attrs = pci_dev_dev_attrs,
1559 .is_visible = pci_dev_attrs_are_visible,
1560};
1561
1562static const struct attribute_group *pci_dev_attr_groups[] = {
1563 &pci_dev_attr_group,
1564 &pci_dev_hp_attr_group,
1565#ifdef CONFIG_PCI_IOV
1566 &sriov_dev_attr_group,
1567#endif
1568 NULL,
1569};
1570
1571struct device_type pci_dev_type = {
1572 .groups = pci_dev_attr_groups,
1573};