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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};
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(revision, "0x%02x\n");
54pci_config_attr(class, "0x%06x\n");
55pci_config_attr(irq, "%u\n");
56
57static ssize_t broken_parity_status_show(struct device *dev,
58 struct device_attribute *attr,
59 char *buf)
60{
61 struct pci_dev *pdev = to_pci_dev(dev);
62 return sprintf(buf, "%u\n", pdev->broken_parity_status);
63}
64
65static ssize_t broken_parity_status_store(struct device *dev,
66 struct device_attribute *attr,
67 const char *buf, size_t count)
68{
69 struct pci_dev *pdev = to_pci_dev(dev);
70 unsigned long val;
71
72 if (kstrtoul(buf, 0, &val) < 0)
73 return -EINVAL;
74
75 pdev->broken_parity_status = !!val;
76
77 return count;
78}
79static DEVICE_ATTR_RW(broken_parity_status);
80
81static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
82 struct device_attribute *attr, char *buf)
83{
84 const struct cpumask *mask;
85
86#ifdef CONFIG_NUMA
87 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
88 cpumask_of_node(dev_to_node(dev));
89#else
90 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
91#endif
92 return cpumap_print_to_pagebuf(list, buf, mask);
93}
94
95static ssize_t local_cpus_show(struct device *dev,
96 struct device_attribute *attr, char *buf)
97{
98 return pci_dev_show_local_cpu(dev, false, attr, buf);
99}
100static DEVICE_ATTR_RO(local_cpus);
101
102static ssize_t local_cpulist_show(struct device *dev,
103 struct device_attribute *attr, char *buf)
104{
105 return pci_dev_show_local_cpu(dev, true, attr, buf);
106}
107static DEVICE_ATTR_RO(local_cpulist);
108
109/*
110 * PCI Bus Class Devices
111 */
112static ssize_t cpuaffinity_show(struct device *dev,
113 struct device_attribute *attr, char *buf)
114{
115 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
116
117 return cpumap_print_to_pagebuf(false, buf, cpumask);
118}
119static DEVICE_ATTR_RO(cpuaffinity);
120
121static ssize_t cpulistaffinity_show(struct device *dev,
122 struct device_attribute *attr, char *buf)
123{
124 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
125
126 return cpumap_print_to_pagebuf(true, buf, cpumask);
127}
128static DEVICE_ATTR_RO(cpulistaffinity);
129
130/* show resources */
131static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
132 char *buf)
133{
134 struct pci_dev *pci_dev = to_pci_dev(dev);
135 char *str = buf;
136 int i;
137 int max;
138 resource_size_t start, end;
139
140 if (pci_dev->subordinate)
141 max = DEVICE_COUNT_RESOURCE;
142 else
143 max = PCI_BRIDGE_RESOURCES;
144
145 for (i = 0; i < max; i++) {
146 struct resource *res = &pci_dev->resource[i];
147 pci_resource_to_user(pci_dev, i, res, &start, &end);
148 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
149 (unsigned long long)start,
150 (unsigned long long)end,
151 (unsigned long long)res->flags);
152 }
153 return (str - buf);
154}
155static DEVICE_ATTR_RO(resource);
156
157static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
158 char *buf)
159{
160 struct pci_dev *pci_dev = to_pci_dev(dev);
161
162 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
163 pci_dev->vendor, pci_dev->device,
164 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
165 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
166 (u8)(pci_dev->class));
167}
168static DEVICE_ATTR_RO(modalias);
169
170static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
171 const char *buf, size_t count)
172{
173 struct pci_dev *pdev = to_pci_dev(dev);
174 unsigned long val;
175 ssize_t result = kstrtoul(buf, 0, &val);
176
177 if (result < 0)
178 return result;
179
180 /* this can crash the machine when done on the "wrong" device */
181 if (!capable(CAP_SYS_ADMIN))
182 return -EPERM;
183
184 if (!val) {
185 if (pci_is_enabled(pdev))
186 pci_disable_device(pdev);
187 else
188 result = -EIO;
189 } else
190 result = pci_enable_device(pdev);
191
192 return result < 0 ? result : count;
193}
194
195static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
196 char *buf)
197{
198 struct pci_dev *pdev;
199
200 pdev = to_pci_dev(dev);
201 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
202}
203static DEVICE_ATTR_RW(enable);
204
205#ifdef CONFIG_NUMA
206static ssize_t numa_node_store(struct device *dev,
207 struct device_attribute *attr, const char *buf,
208 size_t count)
209{
210 struct pci_dev *pdev = to_pci_dev(dev);
211 int node, ret;
212
213 if (!capable(CAP_SYS_ADMIN))
214 return -EPERM;
215
216 ret = kstrtoint(buf, 0, &node);
217 if (ret)
218 return ret;
219
220 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
221 return -EINVAL;
222
223 if (node != NUMA_NO_NODE && !node_online(node))
224 return -EINVAL;
225
226 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
227 dev_alert(&pdev->dev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
228 node);
229
230 dev->numa_node = node;
231 return count;
232}
233
234static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
235 char *buf)
236{
237 return sprintf(buf, "%d\n", dev->numa_node);
238}
239static DEVICE_ATTR_RW(numa_node);
240#endif
241
242static ssize_t dma_mask_bits_show(struct device *dev,
243 struct device_attribute *attr, char *buf)
244{
245 struct pci_dev *pdev = to_pci_dev(dev);
246
247 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
248}
249static DEVICE_ATTR_RO(dma_mask_bits);
250
251static ssize_t consistent_dma_mask_bits_show(struct device *dev,
252 struct device_attribute *attr,
253 char *buf)
254{
255 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
256}
257static DEVICE_ATTR_RO(consistent_dma_mask_bits);
258
259static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
260 char *buf)
261{
262 struct pci_dev *pdev = to_pci_dev(dev);
263 struct pci_bus *subordinate = pdev->subordinate;
264
265 return sprintf(buf, "%u\n", subordinate ?
266 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
267 : !pdev->no_msi);
268}
269
270static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
271 const char *buf, size_t count)
272{
273 struct pci_dev *pdev = to_pci_dev(dev);
274 struct pci_bus *subordinate = pdev->subordinate;
275 unsigned long val;
276
277 if (kstrtoul(buf, 0, &val) < 0)
278 return -EINVAL;
279
280 if (!capable(CAP_SYS_ADMIN))
281 return -EPERM;
282
283 /*
284 * "no_msi" and "bus_flags" only affect what happens when a driver
285 * requests MSI or MSI-X. They don't affect any drivers that have
286 * already requested MSI or MSI-X.
287 */
288 if (!subordinate) {
289 pdev->no_msi = !val;
290 dev_info(&pdev->dev, "MSI/MSI-X %s for future drivers\n",
291 val ? "allowed" : "disallowed");
292 return count;
293 }
294
295 if (val)
296 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
297 else
298 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
299
300 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
301 val ? "allowed" : "disallowed");
302 return count;
303}
304static DEVICE_ATTR_RW(msi_bus);
305
306static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
307 size_t count)
308{
309 unsigned long val;
310 struct pci_bus *b = NULL;
311
312 if (kstrtoul(buf, 0, &val) < 0)
313 return -EINVAL;
314
315 if (val) {
316 pci_lock_rescan_remove();
317 while ((b = pci_find_next_bus(b)) != NULL)
318 pci_rescan_bus(b);
319 pci_unlock_rescan_remove();
320 }
321 return count;
322}
323static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
324
325static struct attribute *pci_bus_attrs[] = {
326 &bus_attr_rescan.attr,
327 NULL,
328};
329
330static const struct attribute_group pci_bus_group = {
331 .attrs = pci_bus_attrs,
332};
333
334const struct attribute_group *pci_bus_groups[] = {
335 &pci_bus_group,
336 NULL,
337};
338
339static ssize_t dev_rescan_store(struct device *dev,
340 struct device_attribute *attr, const char *buf,
341 size_t count)
342{
343 unsigned long val;
344 struct pci_dev *pdev = to_pci_dev(dev);
345
346 if (kstrtoul(buf, 0, &val) < 0)
347 return -EINVAL;
348
349 if (val) {
350 pci_lock_rescan_remove();
351 pci_rescan_bus(pdev->bus);
352 pci_unlock_rescan_remove();
353 }
354 return count;
355}
356static struct device_attribute dev_rescan_attr = __ATTR(rescan,
357 (S_IWUSR|S_IWGRP),
358 NULL, dev_rescan_store);
359
360static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
361 const char *buf, size_t count)
362{
363 unsigned long val;
364
365 if (kstrtoul(buf, 0, &val) < 0)
366 return -EINVAL;
367
368 if (val && device_remove_file_self(dev, attr))
369 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
370 return count;
371}
372static struct device_attribute dev_remove_attr = __ATTR(remove,
373 (S_IWUSR|S_IWGRP),
374 NULL, remove_store);
375
376static ssize_t dev_bus_rescan_store(struct device *dev,
377 struct device_attribute *attr,
378 const char *buf, size_t count)
379{
380 unsigned long val;
381 struct pci_bus *bus = to_pci_bus(dev);
382
383 if (kstrtoul(buf, 0, &val) < 0)
384 return -EINVAL;
385
386 if (val) {
387 pci_lock_rescan_remove();
388 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
389 pci_rescan_bus_bridge_resize(bus->self);
390 else
391 pci_rescan_bus(bus);
392 pci_unlock_rescan_remove();
393 }
394 return count;
395}
396static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
397
398#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
399static ssize_t d3cold_allowed_store(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf, size_t count)
402{
403 struct pci_dev *pdev = to_pci_dev(dev);
404 unsigned long val;
405
406 if (kstrtoul(buf, 0, &val) < 0)
407 return -EINVAL;
408
409 pdev->d3cold_allowed = !!val;
410 if (pdev->d3cold_allowed)
411 pci_d3cold_enable(pdev);
412 else
413 pci_d3cold_disable(pdev);
414
415 pm_runtime_resume(dev);
416
417 return count;
418}
419
420static ssize_t d3cold_allowed_show(struct device *dev,
421 struct device_attribute *attr, char *buf)
422{
423 struct pci_dev *pdev = to_pci_dev(dev);
424 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
425}
426static DEVICE_ATTR_RW(d3cold_allowed);
427#endif
428
429#ifdef CONFIG_OF
430static ssize_t devspec_show(struct device *dev,
431 struct device_attribute *attr, char *buf)
432{
433 struct pci_dev *pdev = to_pci_dev(dev);
434 struct device_node *np = pci_device_to_OF_node(pdev);
435
436 if (np == NULL || np->full_name == NULL)
437 return 0;
438 return sprintf(buf, "%s", np->full_name);
439}
440static DEVICE_ATTR_RO(devspec);
441#endif
442
443#ifdef CONFIG_PCI_IOV
444static ssize_t sriov_totalvfs_show(struct device *dev,
445 struct device_attribute *attr,
446 char *buf)
447{
448 struct pci_dev *pdev = to_pci_dev(dev);
449
450 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
451}
452
453
454static ssize_t sriov_numvfs_show(struct device *dev,
455 struct device_attribute *attr,
456 char *buf)
457{
458 struct pci_dev *pdev = to_pci_dev(dev);
459
460 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
461}
462
463/*
464 * num_vfs > 0; number of VFs to enable
465 * num_vfs = 0; disable all VFs
466 *
467 * Note: SRIOV spec doesn't allow partial VF
468 * disable, so it's all or none.
469 */
470static ssize_t sriov_numvfs_store(struct device *dev,
471 struct device_attribute *attr,
472 const char *buf, size_t count)
473{
474 struct pci_dev *pdev = to_pci_dev(dev);
475 int ret;
476 u16 num_vfs;
477
478 ret = kstrtou16(buf, 0, &num_vfs);
479 if (ret < 0)
480 return ret;
481
482 if (num_vfs > pci_sriov_get_totalvfs(pdev))
483 return -ERANGE;
484
485 if (num_vfs == pdev->sriov->num_VFs)
486 return count; /* no change */
487
488 /* is PF driver loaded w/callback */
489 if (!pdev->driver || !pdev->driver->sriov_configure) {
490 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
491 return -ENOSYS;
492 }
493
494 if (num_vfs == 0) {
495 /* disable VFs */
496 ret = pdev->driver->sriov_configure(pdev, 0);
497 if (ret < 0)
498 return ret;
499 return count;
500 }
501
502 /* enable VFs */
503 if (pdev->sriov->num_VFs) {
504 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
505 pdev->sriov->num_VFs, num_vfs);
506 return -EBUSY;
507 }
508
509 ret = pdev->driver->sriov_configure(pdev, num_vfs);
510 if (ret < 0)
511 return ret;
512
513 if (ret != num_vfs)
514 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
515 num_vfs, ret);
516
517 return count;
518}
519
520static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
521static struct device_attribute sriov_numvfs_attr =
522 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
523 sriov_numvfs_show, sriov_numvfs_store);
524#endif /* CONFIG_PCI_IOV */
525
526static ssize_t driver_override_store(struct device *dev,
527 struct device_attribute *attr,
528 const char *buf, size_t count)
529{
530 struct pci_dev *pdev = to_pci_dev(dev);
531 char *driver_override, *old = pdev->driver_override, *cp;
532
533 /* We need to keep extra room for a newline */
534 if (count >= (PAGE_SIZE - 1))
535 return -EINVAL;
536
537 driver_override = kstrndup(buf, count, GFP_KERNEL);
538 if (!driver_override)
539 return -ENOMEM;
540
541 cp = strchr(driver_override, '\n');
542 if (cp)
543 *cp = '\0';
544
545 if (strlen(driver_override)) {
546 pdev->driver_override = driver_override;
547 } else {
548 kfree(driver_override);
549 pdev->driver_override = NULL;
550 }
551
552 kfree(old);
553
554 return count;
555}
556
557static ssize_t driver_override_show(struct device *dev,
558 struct device_attribute *attr, char *buf)
559{
560 struct pci_dev *pdev = to_pci_dev(dev);
561
562 return snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
563}
564static DEVICE_ATTR_RW(driver_override);
565
566static struct attribute *pci_dev_attrs[] = {
567 &dev_attr_resource.attr,
568 &dev_attr_vendor.attr,
569 &dev_attr_device.attr,
570 &dev_attr_subsystem_vendor.attr,
571 &dev_attr_subsystem_device.attr,
572 &dev_attr_revision.attr,
573 &dev_attr_class.attr,
574 &dev_attr_irq.attr,
575 &dev_attr_local_cpus.attr,
576 &dev_attr_local_cpulist.attr,
577 &dev_attr_modalias.attr,
578#ifdef CONFIG_NUMA
579 &dev_attr_numa_node.attr,
580#endif
581 &dev_attr_dma_mask_bits.attr,
582 &dev_attr_consistent_dma_mask_bits.attr,
583 &dev_attr_enable.attr,
584 &dev_attr_broken_parity_status.attr,
585 &dev_attr_msi_bus.attr,
586#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
587 &dev_attr_d3cold_allowed.attr,
588#endif
589#ifdef CONFIG_OF
590 &dev_attr_devspec.attr,
591#endif
592 &dev_attr_driver_override.attr,
593 NULL,
594};
595
596static const struct attribute_group pci_dev_group = {
597 .attrs = pci_dev_attrs,
598};
599
600const struct attribute_group *pci_dev_groups[] = {
601 &pci_dev_group,
602 NULL,
603};
604
605static struct attribute *pcibus_attrs[] = {
606 &dev_attr_rescan.attr,
607 &dev_attr_cpuaffinity.attr,
608 &dev_attr_cpulistaffinity.attr,
609 NULL,
610};
611
612static const struct attribute_group pcibus_group = {
613 .attrs = pcibus_attrs,
614};
615
616const struct attribute_group *pcibus_groups[] = {
617 &pcibus_group,
618 NULL,
619};
620
621static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
622 char *buf)
623{
624 struct pci_dev *pdev = to_pci_dev(dev);
625 struct pci_dev *vga_dev = vga_default_device();
626
627 if (vga_dev)
628 return sprintf(buf, "%u\n", (pdev == vga_dev));
629
630 return sprintf(buf, "%u\n",
631 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
632 IORESOURCE_ROM_SHADOW));
633}
634static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
635
636static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
637 struct bin_attribute *bin_attr, char *buf,
638 loff_t off, size_t count)
639{
640 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
641 unsigned int size = 64;
642 loff_t init_off = off;
643 u8 *data = (u8 *) buf;
644
645 /* Several chips lock up trying to read undefined config space */
646 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
647 size = dev->cfg_size;
648 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
649 size = 128;
650
651 if (off > size)
652 return 0;
653 if (off + count > size) {
654 size -= off;
655 count = size;
656 } else {
657 size = count;
658 }
659
660 pci_config_pm_runtime_get(dev);
661
662 if ((off & 1) && size) {
663 u8 val;
664 pci_user_read_config_byte(dev, off, &val);
665 data[off - init_off] = val;
666 off++;
667 size--;
668 }
669
670 if ((off & 3) && size > 2) {
671 u16 val;
672 pci_user_read_config_word(dev, off, &val);
673 data[off - init_off] = val & 0xff;
674 data[off - init_off + 1] = (val >> 8) & 0xff;
675 off += 2;
676 size -= 2;
677 }
678
679 while (size > 3) {
680 u32 val;
681 pci_user_read_config_dword(dev, off, &val);
682 data[off - init_off] = val & 0xff;
683 data[off - init_off + 1] = (val >> 8) & 0xff;
684 data[off - init_off + 2] = (val >> 16) & 0xff;
685 data[off - init_off + 3] = (val >> 24) & 0xff;
686 off += 4;
687 size -= 4;
688 }
689
690 if (size >= 2) {
691 u16 val;
692 pci_user_read_config_word(dev, off, &val);
693 data[off - init_off] = val & 0xff;
694 data[off - init_off + 1] = (val >> 8) & 0xff;
695 off += 2;
696 size -= 2;
697 }
698
699 if (size > 0) {
700 u8 val;
701 pci_user_read_config_byte(dev, off, &val);
702 data[off - init_off] = val;
703 off++;
704 --size;
705 }
706
707 pci_config_pm_runtime_put(dev);
708
709 return count;
710}
711
712static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
713 struct bin_attribute *bin_attr, char *buf,
714 loff_t off, size_t count)
715{
716 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
717 unsigned int size = count;
718 loff_t init_off = off;
719 u8 *data = (u8 *) buf;
720
721 if (off > dev->cfg_size)
722 return 0;
723 if (off + count > dev->cfg_size) {
724 size = dev->cfg_size - off;
725 count = size;
726 }
727
728 pci_config_pm_runtime_get(dev);
729
730 if ((off & 1) && size) {
731 pci_user_write_config_byte(dev, off, data[off - init_off]);
732 off++;
733 size--;
734 }
735
736 if ((off & 3) && size > 2) {
737 u16 val = data[off - init_off];
738 val |= (u16) data[off - init_off + 1] << 8;
739 pci_user_write_config_word(dev, off, val);
740 off += 2;
741 size -= 2;
742 }
743
744 while (size > 3) {
745 u32 val = data[off - init_off];
746 val |= (u32) data[off - init_off + 1] << 8;
747 val |= (u32) data[off - init_off + 2] << 16;
748 val |= (u32) data[off - init_off + 3] << 24;
749 pci_user_write_config_dword(dev, off, val);
750 off += 4;
751 size -= 4;
752 }
753
754 if (size >= 2) {
755 u16 val = data[off - init_off];
756 val |= (u16) data[off - init_off + 1] << 8;
757 pci_user_write_config_word(dev, off, val);
758 off += 2;
759 size -= 2;
760 }
761
762 if (size) {
763 pci_user_write_config_byte(dev, off, data[off - init_off]);
764 off++;
765 --size;
766 }
767
768 pci_config_pm_runtime_put(dev);
769
770 return count;
771}
772
773static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
774 struct bin_attribute *bin_attr, char *buf,
775 loff_t off, size_t count)
776{
777 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
778
779 if (bin_attr->size > 0) {
780 if (off > bin_attr->size)
781 count = 0;
782 else if (count > bin_attr->size - off)
783 count = bin_attr->size - off;
784 }
785
786 return pci_read_vpd(dev, off, count, buf);
787}
788
789static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
790 struct bin_attribute *bin_attr, char *buf,
791 loff_t off, size_t count)
792{
793 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
794
795 if (bin_attr->size > 0) {
796 if (off > bin_attr->size)
797 count = 0;
798 else if (count > bin_attr->size - off)
799 count = bin_attr->size - off;
800 }
801
802 return pci_write_vpd(dev, off, count, buf);
803}
804
805#ifdef HAVE_PCI_LEGACY
806/**
807 * pci_read_legacy_io - read byte(s) from legacy I/O port space
808 * @filp: open sysfs file
809 * @kobj: kobject corresponding to file to read from
810 * @bin_attr: struct bin_attribute for this file
811 * @buf: buffer to store results
812 * @off: offset into legacy I/O port space
813 * @count: number of bytes to read
814 *
815 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
816 * callback routine (pci_legacy_read).
817 */
818static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
819 struct bin_attribute *bin_attr, char *buf,
820 loff_t off, size_t count)
821{
822 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
823
824 /* Only support 1, 2 or 4 byte accesses */
825 if (count != 1 && count != 2 && count != 4)
826 return -EINVAL;
827
828 return pci_legacy_read(bus, off, (u32 *)buf, count);
829}
830
831/**
832 * pci_write_legacy_io - write byte(s) to legacy I/O port space
833 * @filp: open sysfs file
834 * @kobj: kobject corresponding to file to read from
835 * @bin_attr: struct bin_attribute for this file
836 * @buf: buffer containing value to be written
837 * @off: offset into legacy I/O port space
838 * @count: number of bytes to write
839 *
840 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
841 * callback routine (pci_legacy_write).
842 */
843static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
844 struct bin_attribute *bin_attr, char *buf,
845 loff_t off, size_t count)
846{
847 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
848
849 /* Only support 1, 2 or 4 byte accesses */
850 if (count != 1 && count != 2 && count != 4)
851 return -EINVAL;
852
853 return pci_legacy_write(bus, off, *(u32 *)buf, count);
854}
855
856/**
857 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
858 * @filp: open sysfs file
859 * @kobj: kobject corresponding to device to be mapped
860 * @attr: struct bin_attribute for this file
861 * @vma: struct vm_area_struct passed to mmap
862 *
863 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
864 * legacy memory space (first meg of bus space) into application virtual
865 * memory space.
866 */
867static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
868 struct bin_attribute *attr,
869 struct vm_area_struct *vma)
870{
871 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
872
873 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
874}
875
876/**
877 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
878 * @filp: open sysfs file
879 * @kobj: kobject corresponding to device to be mapped
880 * @attr: struct bin_attribute for this file
881 * @vma: struct vm_area_struct passed to mmap
882 *
883 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
884 * legacy IO space (first meg of bus space) into application virtual
885 * memory space. Returns -ENOSYS if the operation isn't supported
886 */
887static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
888 struct bin_attribute *attr,
889 struct vm_area_struct *vma)
890{
891 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
892
893 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
894}
895
896/**
897 * pci_adjust_legacy_attr - adjustment of legacy file attributes
898 * @b: bus to create files under
899 * @mmap_type: I/O port or memory
900 *
901 * Stub implementation. Can be overridden by arch if necessary.
902 */
903void __weak pci_adjust_legacy_attr(struct pci_bus *b,
904 enum pci_mmap_state mmap_type)
905{
906}
907
908/**
909 * pci_create_legacy_files - create legacy I/O port and memory files
910 * @b: bus to create files under
911 *
912 * Some platforms allow access to legacy I/O port and ISA memory space on
913 * a per-bus basis. This routine creates the files and ties them into
914 * their associated read, write and mmap files from pci-sysfs.c
915 *
916 * On error unwind, but don't propagate the error to the caller
917 * as it is ok to set up the PCI bus without these files.
918 */
919void pci_create_legacy_files(struct pci_bus *b)
920{
921 int error;
922
923 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
924 GFP_ATOMIC);
925 if (!b->legacy_io)
926 goto kzalloc_err;
927
928 sysfs_bin_attr_init(b->legacy_io);
929 b->legacy_io->attr.name = "legacy_io";
930 b->legacy_io->size = 0xffff;
931 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
932 b->legacy_io->read = pci_read_legacy_io;
933 b->legacy_io->write = pci_write_legacy_io;
934 b->legacy_io->mmap = pci_mmap_legacy_io;
935 pci_adjust_legacy_attr(b, pci_mmap_io);
936 error = device_create_bin_file(&b->dev, b->legacy_io);
937 if (error)
938 goto legacy_io_err;
939
940 /* Allocated above after the legacy_io struct */
941 b->legacy_mem = b->legacy_io + 1;
942 sysfs_bin_attr_init(b->legacy_mem);
943 b->legacy_mem->attr.name = "legacy_mem";
944 b->legacy_mem->size = 1024*1024;
945 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
946 b->legacy_mem->mmap = pci_mmap_legacy_mem;
947 pci_adjust_legacy_attr(b, pci_mmap_mem);
948 error = device_create_bin_file(&b->dev, b->legacy_mem);
949 if (error)
950 goto legacy_mem_err;
951
952 return;
953
954legacy_mem_err:
955 device_remove_bin_file(&b->dev, b->legacy_io);
956legacy_io_err:
957 kfree(b->legacy_io);
958 b->legacy_io = NULL;
959kzalloc_err:
960 printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
961 return;
962}
963
964void pci_remove_legacy_files(struct pci_bus *b)
965{
966 if (b->legacy_io) {
967 device_remove_bin_file(&b->dev, b->legacy_io);
968 device_remove_bin_file(&b->dev, b->legacy_mem);
969 kfree(b->legacy_io); /* both are allocated here */
970 }
971}
972#endif /* HAVE_PCI_LEGACY */
973
974#ifdef HAVE_PCI_MMAP
975
976int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
977 enum pci_mmap_api mmap_api)
978{
979 unsigned long nr, start, size, pci_start;
980
981 if (pci_resource_len(pdev, resno) == 0)
982 return 0;
983 nr = vma_pages(vma);
984 start = vma->vm_pgoff;
985 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
986 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
987 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
988 if (start >= pci_start && start < pci_start + size &&
989 start + nr <= pci_start + size)
990 return 1;
991 return 0;
992}
993
994/**
995 * pci_mmap_resource - map a PCI resource into user memory space
996 * @kobj: kobject for mapping
997 * @attr: struct bin_attribute for the file being mapped
998 * @vma: struct vm_area_struct passed into the mmap
999 * @write_combine: 1 for write_combine mapping
1000 *
1001 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1002 */
1003static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1004 struct vm_area_struct *vma, int write_combine)
1005{
1006 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1007 struct resource *res = attr->private;
1008 enum pci_mmap_state mmap_type;
1009 resource_size_t start, end;
1010 int i;
1011
1012 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1013 if (res == &pdev->resource[i])
1014 break;
1015 if (i >= PCI_ROM_RESOURCE)
1016 return -ENODEV;
1017
1018 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1019 return -EINVAL;
1020
1021 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
1022 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",
1023 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
1024 pci_name(pdev), i,
1025 (u64)pci_resource_start(pdev, i),
1026 (u64)pci_resource_len(pdev, i));
1027 return -EINVAL;
1028 }
1029
1030 /* pci_mmap_page_range() expects the same kind of entry as coming
1031 * from /proc/bus/pci/ which is a "user visible" value. If this is
1032 * different from the resource itself, arch will do necessary fixup.
1033 */
1034 pci_resource_to_user(pdev, i, res, &start, &end);
1035 vma->vm_pgoff += start >> PAGE_SHIFT;
1036 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1037 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1038}
1039
1040static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1041 struct bin_attribute *attr,
1042 struct vm_area_struct *vma)
1043{
1044 return pci_mmap_resource(kobj, attr, vma, 0);
1045}
1046
1047static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1048 struct bin_attribute *attr,
1049 struct vm_area_struct *vma)
1050{
1051 return pci_mmap_resource(kobj, attr, vma, 1);
1052}
1053
1054static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1055 struct bin_attribute *attr, char *buf,
1056 loff_t off, size_t count, bool write)
1057{
1058 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1059 struct resource *res = attr->private;
1060 unsigned long port = off;
1061 int i;
1062
1063 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1064 if (res == &pdev->resource[i])
1065 break;
1066 if (i >= PCI_ROM_RESOURCE)
1067 return -ENODEV;
1068
1069 port += pci_resource_start(pdev, i);
1070
1071 if (port > pci_resource_end(pdev, i))
1072 return 0;
1073
1074 if (port + count - 1 > pci_resource_end(pdev, i))
1075 return -EINVAL;
1076
1077 switch (count) {
1078 case 1:
1079 if (write)
1080 outb(*(u8 *)buf, port);
1081 else
1082 *(u8 *)buf = inb(port);
1083 return 1;
1084 case 2:
1085 if (write)
1086 outw(*(u16 *)buf, port);
1087 else
1088 *(u16 *)buf = inw(port);
1089 return 2;
1090 case 4:
1091 if (write)
1092 outl(*(u32 *)buf, port);
1093 else
1094 *(u32 *)buf = inl(port);
1095 return 4;
1096 }
1097 return -EINVAL;
1098}
1099
1100static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1101 struct bin_attribute *attr, char *buf,
1102 loff_t off, size_t count)
1103{
1104 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1105}
1106
1107static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1108 struct bin_attribute *attr, char *buf,
1109 loff_t off, size_t count)
1110{
1111 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1112}
1113
1114/**
1115 * pci_remove_resource_files - cleanup resource files
1116 * @pdev: dev to cleanup
1117 *
1118 * If we created resource files for @pdev, remove them from sysfs and
1119 * free their resources.
1120 */
1121static void pci_remove_resource_files(struct pci_dev *pdev)
1122{
1123 int i;
1124
1125 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1126 struct bin_attribute *res_attr;
1127
1128 res_attr = pdev->res_attr[i];
1129 if (res_attr) {
1130 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1131 kfree(res_attr);
1132 }
1133
1134 res_attr = pdev->res_attr_wc[i];
1135 if (res_attr) {
1136 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1137 kfree(res_attr);
1138 }
1139 }
1140}
1141
1142static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1143{
1144 /* allocate attribute structure, piggyback attribute name */
1145 int name_len = write_combine ? 13 : 10;
1146 struct bin_attribute *res_attr;
1147 char *res_attr_name;
1148 int retval;
1149
1150 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1151 if (!res_attr)
1152 return -ENOMEM;
1153
1154 res_attr_name = (char *)(res_attr + 1);
1155
1156 sysfs_bin_attr_init(res_attr);
1157 if (write_combine) {
1158 pdev->res_attr_wc[num] = res_attr;
1159 sprintf(res_attr_name, "resource%d_wc", num);
1160 res_attr->mmap = pci_mmap_resource_wc;
1161 } else {
1162 pdev->res_attr[num] = res_attr;
1163 sprintf(res_attr_name, "resource%d", num);
1164 res_attr->mmap = pci_mmap_resource_uc;
1165 }
1166 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1167 res_attr->read = pci_read_resource_io;
1168 res_attr->write = pci_write_resource_io;
1169 }
1170 res_attr->attr.name = res_attr_name;
1171 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1172 res_attr->size = pci_resource_len(pdev, num);
1173 res_attr->private = &pdev->resource[num];
1174 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1175 if (retval)
1176 kfree(res_attr);
1177
1178 return retval;
1179}
1180
1181/**
1182 * pci_create_resource_files - create resource files in sysfs for @dev
1183 * @pdev: dev in question
1184 *
1185 * Walk the resources in @pdev creating files for each resource available.
1186 */
1187static int pci_create_resource_files(struct pci_dev *pdev)
1188{
1189 int i;
1190 int retval;
1191
1192 /* Expose the PCI resources from this device as files */
1193 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1194
1195 /* skip empty resources */
1196 if (!pci_resource_len(pdev, i))
1197 continue;
1198
1199 retval = pci_create_attr(pdev, i, 0);
1200 /* for prefetchable resources, create a WC mappable file */
1201 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1202 retval = pci_create_attr(pdev, i, 1);
1203
1204 if (retval) {
1205 pci_remove_resource_files(pdev);
1206 return retval;
1207 }
1208 }
1209 return 0;
1210}
1211#else /* !HAVE_PCI_MMAP */
1212int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1213void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1214#endif /* HAVE_PCI_MMAP */
1215
1216/**
1217 * pci_write_rom - used to enable access to the PCI ROM display
1218 * @filp: sysfs file
1219 * @kobj: kernel object handle
1220 * @bin_attr: struct bin_attribute for this file
1221 * @buf: user input
1222 * @off: file offset
1223 * @count: number of byte in input
1224 *
1225 * writing anything except 0 enables it
1226 */
1227static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1228 struct bin_attribute *bin_attr, char *buf,
1229 loff_t off, size_t count)
1230{
1231 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1232
1233 if ((off == 0) && (*buf == '0') && (count == 2))
1234 pdev->rom_attr_enabled = 0;
1235 else
1236 pdev->rom_attr_enabled = 1;
1237
1238 return count;
1239}
1240
1241/**
1242 * pci_read_rom - read a PCI ROM
1243 * @filp: sysfs file
1244 * @kobj: kernel object handle
1245 * @bin_attr: struct bin_attribute for this file
1246 * @buf: where to put the data we read from the ROM
1247 * @off: file offset
1248 * @count: number of bytes to read
1249 *
1250 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1251 * device corresponding to @kobj.
1252 */
1253static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1254 struct bin_attribute *bin_attr, char *buf,
1255 loff_t off, size_t count)
1256{
1257 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1258 void __iomem *rom;
1259 size_t size;
1260
1261 if (!pdev->rom_attr_enabled)
1262 return -EINVAL;
1263
1264 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1265 if (!rom || !size)
1266 return -EIO;
1267
1268 if (off >= size)
1269 count = 0;
1270 else {
1271 if (off + count > size)
1272 count = size - off;
1273
1274 memcpy_fromio(buf, rom + off, count);
1275 }
1276 pci_unmap_rom(pdev, rom);
1277
1278 return count;
1279}
1280
1281static struct bin_attribute pci_config_attr = {
1282 .attr = {
1283 .name = "config",
1284 .mode = S_IRUGO | S_IWUSR,
1285 },
1286 .size = PCI_CFG_SPACE_SIZE,
1287 .read = pci_read_config,
1288 .write = pci_write_config,
1289};
1290
1291static struct bin_attribute pcie_config_attr = {
1292 .attr = {
1293 .name = "config",
1294 .mode = S_IRUGO | S_IWUSR,
1295 },
1296 .size = PCI_CFG_SPACE_EXP_SIZE,
1297 .read = pci_read_config,
1298 .write = pci_write_config,
1299};
1300
1301static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1302 const char *buf, size_t count)
1303{
1304 struct pci_dev *pdev = to_pci_dev(dev);
1305 unsigned long val;
1306 ssize_t result = kstrtoul(buf, 0, &val);
1307
1308 if (result < 0)
1309 return result;
1310
1311 if (val != 1)
1312 return -EINVAL;
1313
1314 result = pci_reset_function(pdev);
1315 if (result < 0)
1316 return result;
1317
1318 return count;
1319}
1320
1321static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1322
1323static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1324{
1325 int retval;
1326 struct bin_attribute *attr;
1327
1328 /* If the device has VPD, try to expose it in sysfs. */
1329 if (dev->vpd) {
1330 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1331 if (!attr)
1332 return -ENOMEM;
1333
1334 sysfs_bin_attr_init(attr);
1335 attr->size = 0;
1336 attr->attr.name = "vpd";
1337 attr->attr.mode = S_IRUSR | S_IWUSR;
1338 attr->read = read_vpd_attr;
1339 attr->write = write_vpd_attr;
1340 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1341 if (retval) {
1342 kfree(attr);
1343 return retval;
1344 }
1345 dev->vpd->attr = attr;
1346 }
1347
1348 /* Active State Power Management */
1349 pcie_aspm_create_sysfs_dev_files(dev);
1350
1351 if (!pci_probe_reset_function(dev)) {
1352 retval = device_create_file(&dev->dev, &reset_attr);
1353 if (retval)
1354 goto error;
1355 dev->reset_fn = 1;
1356 }
1357 return 0;
1358
1359error:
1360 pcie_aspm_remove_sysfs_dev_files(dev);
1361 if (dev->vpd && dev->vpd->attr) {
1362 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1363 kfree(dev->vpd->attr);
1364 }
1365
1366 return retval;
1367}
1368
1369int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1370{
1371 int retval;
1372 int rom_size;
1373 struct bin_attribute *attr;
1374
1375 if (!sysfs_initialized)
1376 return -EACCES;
1377
1378 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1379 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1380 else
1381 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1382 if (retval)
1383 goto err;
1384
1385 retval = pci_create_resource_files(pdev);
1386 if (retval)
1387 goto err_config_file;
1388
1389 /* If the device has a ROM, try to expose it in sysfs. */
1390 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1391 if (rom_size) {
1392 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1393 if (!attr) {
1394 retval = -ENOMEM;
1395 goto err_resource_files;
1396 }
1397 sysfs_bin_attr_init(attr);
1398 attr->size = rom_size;
1399 attr->attr.name = "rom";
1400 attr->attr.mode = S_IRUSR | S_IWUSR;
1401 attr->read = pci_read_rom;
1402 attr->write = pci_write_rom;
1403 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1404 if (retval) {
1405 kfree(attr);
1406 goto err_resource_files;
1407 }
1408 pdev->rom_attr = attr;
1409 }
1410
1411 /* add sysfs entries for various capabilities */
1412 retval = pci_create_capabilities_sysfs(pdev);
1413 if (retval)
1414 goto err_rom_file;
1415
1416 pci_create_firmware_label_files(pdev);
1417
1418 return 0;
1419
1420err_rom_file:
1421 if (pdev->rom_attr) {
1422 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1423 kfree(pdev->rom_attr);
1424 pdev->rom_attr = NULL;
1425 }
1426err_resource_files:
1427 pci_remove_resource_files(pdev);
1428err_config_file:
1429 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1430 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1431 else
1432 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1433err:
1434 return retval;
1435}
1436
1437static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1438{
1439 if (dev->vpd && dev->vpd->attr) {
1440 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1441 kfree(dev->vpd->attr);
1442 }
1443
1444 pcie_aspm_remove_sysfs_dev_files(dev);
1445 if (dev->reset_fn) {
1446 device_remove_file(&dev->dev, &reset_attr);
1447 dev->reset_fn = 0;
1448 }
1449}
1450
1451/**
1452 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1453 * @pdev: device whose entries we should free
1454 *
1455 * Cleanup when @pdev is removed from sysfs.
1456 */
1457void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1458{
1459 if (!sysfs_initialized)
1460 return;
1461
1462 pci_remove_capabilities_sysfs(pdev);
1463
1464 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1465 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1466 else
1467 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1468
1469 pci_remove_resource_files(pdev);
1470
1471 if (pdev->rom_attr) {
1472 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1473 kfree(pdev->rom_attr);
1474 pdev->rom_attr = NULL;
1475 }
1476
1477 pci_remove_firmware_label_files(pdev);
1478}
1479
1480static int __init pci_sysfs_init(void)
1481{
1482 struct pci_dev *pdev = NULL;
1483 int retval;
1484
1485 sysfs_initialized = 1;
1486 for_each_pci_dev(pdev) {
1487 retval = pci_create_sysfs_dev_files(pdev);
1488 if (retval) {
1489 pci_dev_put(pdev);
1490 return retval;
1491 }
1492 }
1493
1494 return 0;
1495}
1496late_initcall(pci_sysfs_init);
1497
1498static struct attribute *pci_dev_dev_attrs[] = {
1499 &vga_attr.attr,
1500 NULL,
1501};
1502
1503static umode_t pci_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 (a == &vga_attr.attr)
1510 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1511 return 0;
1512
1513 return a->mode;
1514}
1515
1516static struct attribute *pci_dev_hp_attrs[] = {
1517 &dev_remove_attr.attr,
1518 &dev_rescan_attr.attr,
1519 NULL,
1520};
1521
1522static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1523 struct attribute *a, int n)
1524{
1525 struct device *dev = kobj_to_dev(kobj);
1526 struct pci_dev *pdev = to_pci_dev(dev);
1527
1528 if (pdev->is_virtfn)
1529 return 0;
1530
1531 return a->mode;
1532}
1533
1534static struct attribute_group pci_dev_hp_attr_group = {
1535 .attrs = pci_dev_hp_attrs,
1536 .is_visible = pci_dev_hp_attrs_are_visible,
1537};
1538
1539#ifdef CONFIG_PCI_IOV
1540static struct attribute *sriov_dev_attrs[] = {
1541 &sriov_totalvfs_attr.attr,
1542 &sriov_numvfs_attr.attr,
1543 NULL,
1544};
1545
1546static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1547 struct attribute *a, int n)
1548{
1549 struct device *dev = kobj_to_dev(kobj);
1550
1551 if (!dev_is_pf(dev))
1552 return 0;
1553
1554 return a->mode;
1555}
1556
1557static struct attribute_group sriov_dev_attr_group = {
1558 .attrs = sriov_dev_attrs,
1559 .is_visible = sriov_attrs_are_visible,
1560};
1561#endif /* CONFIG_PCI_IOV */
1562
1563static struct attribute_group pci_dev_attr_group = {
1564 .attrs = pci_dev_dev_attrs,
1565 .is_visible = pci_dev_attrs_are_visible,
1566};
1567
1568static const struct attribute_group *pci_dev_attr_groups[] = {
1569 &pci_dev_attr_group,
1570 &pci_dev_hp_attr_group,
1571#ifdef CONFIG_PCI_IOV
1572 &sriov_dev_attr_group,
1573#endif
1574 NULL,
1575};
1576
1577struct device_type pci_dev_type = {
1578 .groups = pci_dev_attr_groups,
1579};