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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 "pci.h"
33
34static int sysfs_initialized; /* = 0 */
35
36/* show configuration fields */
37#define pci_config_attr(field, format_string) \
38static ssize_t \
39field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
40{ \
41 struct pci_dev *pdev; \
42 \
43 pdev = to_pci_dev (dev); \
44 return sprintf (buf, format_string, pdev->field); \
45} \
46static DEVICE_ATTR_RO(field)
47
48pci_config_attr(vendor, "0x%04x\n");
49pci_config_attr(device, "0x%04x\n");
50pci_config_attr(subsystem_vendor, "0x%04x\n");
51pci_config_attr(subsystem_device, "0x%04x\n");
52pci_config_attr(class, "0x%06x\n");
53pci_config_attr(irq, "%u\n");
54
55static ssize_t broken_parity_status_show(struct device *dev,
56 struct device_attribute *attr,
57 char *buf)
58{
59 struct pci_dev *pdev = to_pci_dev(dev);
60 return sprintf (buf, "%u\n", pdev->broken_parity_status);
61}
62
63static ssize_t broken_parity_status_store(struct device *dev,
64 struct device_attribute *attr,
65 const char *buf, size_t count)
66{
67 struct pci_dev *pdev = to_pci_dev(dev);
68 unsigned long val;
69
70 if (kstrtoul(buf, 0, &val) < 0)
71 return -EINVAL;
72
73 pdev->broken_parity_status = !!val;
74
75 return count;
76}
77static DEVICE_ATTR_RW(broken_parity_status);
78
79static ssize_t pci_dev_show_local_cpu(struct device *dev,
80 int type,
81 struct device_attribute *attr,
82 char *buf)
83{
84 const struct cpumask *mask;
85 int len;
86
87#ifdef CONFIG_NUMA
88 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
89 cpumask_of_node(dev_to_node(dev));
90#else
91 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
92#endif
93 len = type ?
94 cpumask_scnprintf(buf, PAGE_SIZE-2, mask) :
95 cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
96
97 buf[len++] = '\n';
98 buf[len] = '\0';
99 return len;
100}
101
102static ssize_t local_cpus_show(struct device *dev,
103 struct device_attribute *attr, char *buf)
104{
105 return pci_dev_show_local_cpu(dev, 1, attr, buf);
106}
107static DEVICE_ATTR_RO(local_cpus);
108
109static ssize_t local_cpulist_show(struct device *dev,
110 struct device_attribute *attr, char *buf)
111{
112 return pci_dev_show_local_cpu(dev, 0, attr, buf);
113}
114static DEVICE_ATTR_RO(local_cpulist);
115
116/*
117 * PCI Bus Class Devices
118 */
119static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
120 int type,
121 struct device_attribute *attr,
122 char *buf)
123{
124 int ret;
125 const struct cpumask *cpumask;
126
127 cpumask = cpumask_of_pcibus(to_pci_bus(dev));
128 ret = type ?
129 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
130 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
131 buf[ret++] = '\n';
132 buf[ret] = '\0';
133 return ret;
134}
135
136static ssize_t cpuaffinity_show(struct device *dev,
137 struct device_attribute *attr, char *buf)
138{
139 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
140}
141static DEVICE_ATTR_RO(cpuaffinity);
142
143static ssize_t cpulistaffinity_show(struct device *dev,
144 struct device_attribute *attr, char *buf)
145{
146 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
147}
148static DEVICE_ATTR_RO(cpulistaffinity);
149
150/* show resources */
151static ssize_t
152resource_show(struct device * dev, struct device_attribute *attr, char * buf)
153{
154 struct pci_dev * pci_dev = to_pci_dev(dev);
155 char * str = buf;
156 int i;
157 int max;
158 resource_size_t start, end;
159
160 if (pci_dev->subordinate)
161 max = DEVICE_COUNT_RESOURCE;
162 else
163 max = PCI_BRIDGE_RESOURCES;
164
165 for (i = 0; i < max; i++) {
166 struct resource *res = &pci_dev->resource[i];
167 pci_resource_to_user(pci_dev, i, res, &start, &end);
168 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
169 (unsigned long long)start,
170 (unsigned long long)end,
171 (unsigned long long)res->flags);
172 }
173 return (str - buf);
174}
175static DEVICE_ATTR_RO(resource);
176
177static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
178{
179 struct pci_dev *pci_dev = to_pci_dev(dev);
180
181 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
182 pci_dev->vendor, pci_dev->device,
183 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
184 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
185 (u8)(pci_dev->class));
186}
187static DEVICE_ATTR_RO(modalias);
188
189static ssize_t enabled_store(struct device *dev,
190 struct device_attribute *attr, const char *buf,
191 size_t count)
192{
193 struct pci_dev *pdev = to_pci_dev(dev);
194 unsigned long val;
195 ssize_t result = kstrtoul(buf, 0, &val);
196
197 if (result < 0)
198 return result;
199
200 /* this can crash the machine when done on the "wrong" device */
201 if (!capable(CAP_SYS_ADMIN))
202 return -EPERM;
203
204 if (!val) {
205 if (pci_is_enabled(pdev))
206 pci_disable_device(pdev);
207 else
208 result = -EIO;
209 } else
210 result = pci_enable_device(pdev);
211
212 return result < 0 ? result : count;
213}
214
215static ssize_t enabled_show(struct device *dev,
216 struct device_attribute *attr, char *buf)
217{
218 struct pci_dev *pdev;
219
220 pdev = to_pci_dev (dev);
221 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
222}
223static DEVICE_ATTR_RW(enabled);
224
225#ifdef CONFIG_NUMA
226static ssize_t
227numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
228{
229 return sprintf (buf, "%d\n", dev->numa_node);
230}
231static DEVICE_ATTR_RO(numa_node);
232#endif
233
234static ssize_t
235dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
236{
237 struct pci_dev *pdev = to_pci_dev(dev);
238
239 return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
240}
241static DEVICE_ATTR_RO(dma_mask_bits);
242
243static ssize_t
244consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
245 char *buf)
246{
247 return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
248}
249static DEVICE_ATTR_RO(consistent_dma_mask_bits);
250
251static ssize_t
252msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
253{
254 struct pci_dev *pdev = to_pci_dev(dev);
255
256 if (!pdev->subordinate)
257 return 0;
258
259 return sprintf (buf, "%u\n",
260 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
261}
262
263static ssize_t
264msi_bus_store(struct device *dev, struct device_attribute *attr,
265 const char *buf, size_t count)
266{
267 struct pci_dev *pdev = to_pci_dev(dev);
268 unsigned long val;
269
270 if (kstrtoul(buf, 0, &val) < 0)
271 return -EINVAL;
272
273 /*
274 * Bad things may happen if the no_msi flag is changed
275 * while drivers are loaded.
276 */
277 if (!capable(CAP_SYS_ADMIN))
278 return -EPERM;
279
280 /*
281 * Maybe devices without subordinate buses shouldn't have this
282 * attribute in the first place?
283 */
284 if (!pdev->subordinate)
285 return count;
286
287 /* Is the flag going to change, or keep the value it already had? */
288 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
289 !!val) {
290 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
291
292 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
293 " bad things could happen\n", val ? "" : " not");
294 }
295
296 return count;
297}
298static DEVICE_ATTR_RW(msi_bus);
299
300static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
301 size_t count)
302{
303 unsigned long val;
304 struct pci_bus *b = NULL;
305
306 if (kstrtoul(buf, 0, &val) < 0)
307 return -EINVAL;
308
309 if (val) {
310 pci_lock_rescan_remove();
311 while ((b = pci_find_next_bus(b)) != NULL)
312 pci_rescan_bus(b);
313 pci_unlock_rescan_remove();
314 }
315 return count;
316}
317static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
318
319static struct attribute *pci_bus_attrs[] = {
320 &bus_attr_rescan.attr,
321 NULL,
322};
323
324static const struct attribute_group pci_bus_group = {
325 .attrs = pci_bus_attrs,
326};
327
328const struct attribute_group *pci_bus_groups[] = {
329 &pci_bus_group,
330 NULL,
331};
332
333static ssize_t
334dev_rescan_store(struct device *dev, struct device_attribute *attr,
335 const char *buf, size_t count)
336{
337 unsigned long val;
338 struct pci_dev *pdev = to_pci_dev(dev);
339
340 if (kstrtoul(buf, 0, &val) < 0)
341 return -EINVAL;
342
343 if (val) {
344 pci_lock_rescan_remove();
345 pci_rescan_bus(pdev->bus);
346 pci_unlock_rescan_remove();
347 }
348 return count;
349}
350static struct device_attribute dev_rescan_attr = __ATTR(rescan,
351 (S_IWUSR|S_IWGRP),
352 NULL, dev_rescan_store);
353
354static ssize_t
355remove_store(struct device *dev, struct device_attribute *attr,
356 const char *buf, size_t count)
357{
358 unsigned long val;
359
360 if (kstrtoul(buf, 0, &val) < 0)
361 return -EINVAL;
362
363 if (val && device_remove_file_self(dev, attr))
364 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
365 return count;
366}
367static struct device_attribute dev_remove_attr = __ATTR(remove,
368 (S_IWUSR|S_IWGRP),
369 NULL, remove_store);
370
371static ssize_t
372dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
373 const char *buf, size_t count)
374{
375 unsigned long val;
376 struct pci_bus *bus = to_pci_bus(dev);
377
378 if (kstrtoul(buf, 0, &val) < 0)
379 return -EINVAL;
380
381 if (val) {
382 pci_lock_rescan_remove();
383 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
384 pci_rescan_bus_bridge_resize(bus->self);
385 else
386 pci_rescan_bus(bus);
387 pci_unlock_rescan_remove();
388 }
389 return count;
390}
391static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
392
393#if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
394static ssize_t d3cold_allowed_store(struct device *dev,
395 struct device_attribute *attr,
396 const char *buf, size_t count)
397{
398 struct pci_dev *pdev = to_pci_dev(dev);
399 unsigned long val;
400
401 if (kstrtoul(buf, 0, &val) < 0)
402 return -EINVAL;
403
404 pdev->d3cold_allowed = !!val;
405 pm_runtime_resume(dev);
406
407 return count;
408}
409
410static ssize_t d3cold_allowed_show(struct device *dev,
411 struct device_attribute *attr, char *buf)
412{
413 struct pci_dev *pdev = to_pci_dev(dev);
414 return sprintf (buf, "%u\n", pdev->d3cold_allowed);
415}
416static DEVICE_ATTR_RW(d3cold_allowed);
417#endif
418
419#ifdef CONFIG_PCI_IOV
420static ssize_t sriov_totalvfs_show(struct device *dev,
421 struct device_attribute *attr,
422 char *buf)
423{
424 struct pci_dev *pdev = to_pci_dev(dev);
425
426 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
427}
428
429
430static ssize_t sriov_numvfs_show(struct device *dev,
431 struct device_attribute *attr,
432 char *buf)
433{
434 struct pci_dev *pdev = to_pci_dev(dev);
435
436 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
437}
438
439/*
440 * num_vfs > 0; number of VFs to enable
441 * num_vfs = 0; disable all VFs
442 *
443 * Note: SRIOV spec doesn't allow partial VF
444 * disable, so it's all or none.
445 */
446static ssize_t sriov_numvfs_store(struct device *dev,
447 struct device_attribute *attr,
448 const char *buf, size_t count)
449{
450 struct pci_dev *pdev = to_pci_dev(dev);
451 int ret;
452 u16 num_vfs;
453
454 ret = kstrtou16(buf, 0, &num_vfs);
455 if (ret < 0)
456 return ret;
457
458 if (num_vfs > pci_sriov_get_totalvfs(pdev))
459 return -ERANGE;
460
461 if (num_vfs == pdev->sriov->num_VFs)
462 return count; /* no change */
463
464 /* is PF driver loaded w/callback */
465 if (!pdev->driver || !pdev->driver->sriov_configure) {
466 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
467 return -ENOSYS;
468 }
469
470 if (num_vfs == 0) {
471 /* disable VFs */
472 ret = pdev->driver->sriov_configure(pdev, 0);
473 if (ret < 0)
474 return ret;
475 return count;
476 }
477
478 /* enable VFs */
479 if (pdev->sriov->num_VFs) {
480 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
481 pdev->sriov->num_VFs, num_vfs);
482 return -EBUSY;
483 }
484
485 ret = pdev->driver->sriov_configure(pdev, num_vfs);
486 if (ret < 0)
487 return ret;
488
489 if (ret != num_vfs)
490 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
491 num_vfs, ret);
492
493 return count;
494}
495
496static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
497static struct device_attribute sriov_numvfs_attr =
498 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
499 sriov_numvfs_show, sriov_numvfs_store);
500#endif /* CONFIG_PCI_IOV */
501
502static struct attribute *pci_dev_attrs[] = {
503 &dev_attr_resource.attr,
504 &dev_attr_vendor.attr,
505 &dev_attr_device.attr,
506 &dev_attr_subsystem_vendor.attr,
507 &dev_attr_subsystem_device.attr,
508 &dev_attr_class.attr,
509 &dev_attr_irq.attr,
510 &dev_attr_local_cpus.attr,
511 &dev_attr_local_cpulist.attr,
512 &dev_attr_modalias.attr,
513#ifdef CONFIG_NUMA
514 &dev_attr_numa_node.attr,
515#endif
516 &dev_attr_dma_mask_bits.attr,
517 &dev_attr_consistent_dma_mask_bits.attr,
518 &dev_attr_enabled.attr,
519 &dev_attr_broken_parity_status.attr,
520 &dev_attr_msi_bus.attr,
521#if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
522 &dev_attr_d3cold_allowed.attr,
523#endif
524 NULL,
525};
526
527static const struct attribute_group pci_dev_group = {
528 .attrs = pci_dev_attrs,
529};
530
531const struct attribute_group *pci_dev_groups[] = {
532 &pci_dev_group,
533 NULL,
534};
535
536static struct attribute *pcibus_attrs[] = {
537 &dev_attr_rescan.attr,
538 &dev_attr_cpuaffinity.attr,
539 &dev_attr_cpulistaffinity.attr,
540 NULL,
541};
542
543static const struct attribute_group pcibus_group = {
544 .attrs = pcibus_attrs,
545};
546
547const struct attribute_group *pcibus_groups[] = {
548 &pcibus_group,
549 NULL,
550};
551
552static ssize_t
553boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
554{
555 struct pci_dev *pdev = to_pci_dev(dev);
556 struct pci_dev *vga_dev = vga_default_device();
557
558 if (vga_dev)
559 return sprintf(buf, "%u\n", (pdev == vga_dev));
560
561 return sprintf(buf, "%u\n",
562 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
563 IORESOURCE_ROM_SHADOW));
564}
565static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
566
567static ssize_t
568pci_read_config(struct file *filp, struct kobject *kobj,
569 struct bin_attribute *bin_attr,
570 char *buf, loff_t off, size_t count)
571{
572 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
573 unsigned int size = 64;
574 loff_t init_off = off;
575 u8 *data = (u8*) buf;
576
577 /* Several chips lock up trying to read undefined config space */
578 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
579 size = dev->cfg_size;
580 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
581 size = 128;
582 }
583
584 if (off > size)
585 return 0;
586 if (off + count > size) {
587 size -= off;
588 count = size;
589 } else {
590 size = count;
591 }
592
593 pci_config_pm_runtime_get(dev);
594
595 if ((off & 1) && size) {
596 u8 val;
597 pci_user_read_config_byte(dev, off, &val);
598 data[off - init_off] = val;
599 off++;
600 size--;
601 }
602
603 if ((off & 3) && size > 2) {
604 u16 val;
605 pci_user_read_config_word(dev, off, &val);
606 data[off - init_off] = val & 0xff;
607 data[off - init_off + 1] = (val >> 8) & 0xff;
608 off += 2;
609 size -= 2;
610 }
611
612 while (size > 3) {
613 u32 val;
614 pci_user_read_config_dword(dev, off, &val);
615 data[off - init_off] = val & 0xff;
616 data[off - init_off + 1] = (val >> 8) & 0xff;
617 data[off - init_off + 2] = (val >> 16) & 0xff;
618 data[off - init_off + 3] = (val >> 24) & 0xff;
619 off += 4;
620 size -= 4;
621 }
622
623 if (size >= 2) {
624 u16 val;
625 pci_user_read_config_word(dev, off, &val);
626 data[off - init_off] = val & 0xff;
627 data[off - init_off + 1] = (val >> 8) & 0xff;
628 off += 2;
629 size -= 2;
630 }
631
632 if (size > 0) {
633 u8 val;
634 pci_user_read_config_byte(dev, off, &val);
635 data[off - init_off] = val;
636 off++;
637 --size;
638 }
639
640 pci_config_pm_runtime_put(dev);
641
642 return count;
643}
644
645static ssize_t
646pci_write_config(struct file* filp, struct kobject *kobj,
647 struct bin_attribute *bin_attr,
648 char *buf, loff_t off, size_t count)
649{
650 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
651 unsigned int size = count;
652 loff_t init_off = off;
653 u8 *data = (u8*) buf;
654
655 if (off > dev->cfg_size)
656 return 0;
657 if (off + count > dev->cfg_size) {
658 size = dev->cfg_size - off;
659 count = size;
660 }
661
662 pci_config_pm_runtime_get(dev);
663
664 if ((off & 1) && size) {
665 pci_user_write_config_byte(dev, off, data[off - init_off]);
666 off++;
667 size--;
668 }
669
670 if ((off & 3) && size > 2) {
671 u16 val = data[off - init_off];
672 val |= (u16) data[off - init_off + 1] << 8;
673 pci_user_write_config_word(dev, off, val);
674 off += 2;
675 size -= 2;
676 }
677
678 while (size > 3) {
679 u32 val = data[off - init_off];
680 val |= (u32) data[off - init_off + 1] << 8;
681 val |= (u32) data[off - init_off + 2] << 16;
682 val |= (u32) data[off - init_off + 3] << 24;
683 pci_user_write_config_dword(dev, off, val);
684 off += 4;
685 size -= 4;
686 }
687
688 if (size >= 2) {
689 u16 val = data[off - init_off];
690 val |= (u16) data[off - init_off + 1] << 8;
691 pci_user_write_config_word(dev, off, val);
692 off += 2;
693 size -= 2;
694 }
695
696 if (size) {
697 pci_user_write_config_byte(dev, off, data[off - init_off]);
698 off++;
699 --size;
700 }
701
702 pci_config_pm_runtime_put(dev);
703
704 return count;
705}
706
707static ssize_t
708read_vpd_attr(struct file *filp, struct kobject *kobj,
709 struct bin_attribute *bin_attr,
710 char *buf, loff_t off, size_t count)
711{
712 struct pci_dev *dev =
713 to_pci_dev(container_of(kobj, struct device, kobj));
714
715 if (off > bin_attr->size)
716 count = 0;
717 else if (count > bin_attr->size - off)
718 count = bin_attr->size - off;
719
720 return pci_read_vpd(dev, off, count, buf);
721}
722
723static ssize_t
724write_vpd_attr(struct file *filp, struct kobject *kobj,
725 struct bin_attribute *bin_attr,
726 char *buf, loff_t off, size_t count)
727{
728 struct pci_dev *dev =
729 to_pci_dev(container_of(kobj, struct device, kobj));
730
731 if (off > bin_attr->size)
732 count = 0;
733 else if (count > bin_attr->size - off)
734 count = bin_attr->size - off;
735
736 return pci_write_vpd(dev, off, count, buf);
737}
738
739#ifdef HAVE_PCI_LEGACY
740/**
741 * pci_read_legacy_io - read byte(s) from legacy I/O port space
742 * @filp: open sysfs file
743 * @kobj: kobject corresponding to file to read from
744 * @bin_attr: struct bin_attribute for this file
745 * @buf: buffer to store results
746 * @off: offset into legacy I/O port space
747 * @count: number of bytes to read
748 *
749 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
750 * callback routine (pci_legacy_read).
751 */
752static ssize_t
753pci_read_legacy_io(struct file *filp, struct kobject *kobj,
754 struct bin_attribute *bin_attr,
755 char *buf, loff_t off, size_t count)
756{
757 struct pci_bus *bus = to_pci_bus(container_of(kobj,
758 struct device,
759 kobj));
760
761 /* Only support 1, 2 or 4 byte accesses */
762 if (count != 1 && count != 2 && count != 4)
763 return -EINVAL;
764
765 return pci_legacy_read(bus, off, (u32 *)buf, count);
766}
767
768/**
769 * pci_write_legacy_io - write byte(s) to legacy I/O port space
770 * @filp: open sysfs file
771 * @kobj: kobject corresponding to file to read from
772 * @bin_attr: struct bin_attribute for this file
773 * @buf: buffer containing value to be written
774 * @off: offset into legacy I/O port space
775 * @count: number of bytes to write
776 *
777 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
778 * callback routine (pci_legacy_write).
779 */
780static ssize_t
781pci_write_legacy_io(struct file *filp, struct kobject *kobj,
782 struct bin_attribute *bin_attr,
783 char *buf, loff_t off, size_t count)
784{
785 struct pci_bus *bus = to_pci_bus(container_of(kobj,
786 struct device,
787 kobj));
788 /* Only support 1, 2 or 4 byte accesses */
789 if (count != 1 && count != 2 && count != 4)
790 return -EINVAL;
791
792 return pci_legacy_write(bus, off, *(u32 *)buf, count);
793}
794
795/**
796 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
797 * @filp: open sysfs file
798 * @kobj: kobject corresponding to device to be mapped
799 * @attr: struct bin_attribute for this file
800 * @vma: struct vm_area_struct passed to mmap
801 *
802 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
803 * legacy memory space (first meg of bus space) into application virtual
804 * memory space.
805 */
806static int
807pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
808 struct bin_attribute *attr,
809 struct vm_area_struct *vma)
810{
811 struct pci_bus *bus = to_pci_bus(container_of(kobj,
812 struct device,
813 kobj));
814
815 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
816}
817
818/**
819 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
820 * @filp: open sysfs file
821 * @kobj: kobject corresponding to device to be mapped
822 * @attr: struct bin_attribute for this file
823 * @vma: struct vm_area_struct passed to mmap
824 *
825 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
826 * legacy IO space (first meg of bus space) into application virtual
827 * memory space. Returns -ENOSYS if the operation isn't supported
828 */
829static int
830pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
831 struct bin_attribute *attr,
832 struct vm_area_struct *vma)
833{
834 struct pci_bus *bus = to_pci_bus(container_of(kobj,
835 struct device,
836 kobj));
837
838 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
839}
840
841/**
842 * pci_adjust_legacy_attr - adjustment of legacy file attributes
843 * @b: bus to create files under
844 * @mmap_type: I/O port or memory
845 *
846 * Stub implementation. Can be overridden by arch if necessary.
847 */
848void __weak
849pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
850{
851 return;
852}
853
854/**
855 * pci_create_legacy_files - create legacy I/O port and memory files
856 * @b: bus to create files under
857 *
858 * Some platforms allow access to legacy I/O port and ISA memory space on
859 * a per-bus basis. This routine creates the files and ties them into
860 * their associated read, write and mmap files from pci-sysfs.c
861 *
862 * On error unwind, but don't propagate the error to the caller
863 * as it is ok to set up the PCI bus without these files.
864 */
865void pci_create_legacy_files(struct pci_bus *b)
866{
867 int error;
868
869 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
870 GFP_ATOMIC);
871 if (!b->legacy_io)
872 goto kzalloc_err;
873
874 sysfs_bin_attr_init(b->legacy_io);
875 b->legacy_io->attr.name = "legacy_io";
876 b->legacy_io->size = 0xffff;
877 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
878 b->legacy_io->read = pci_read_legacy_io;
879 b->legacy_io->write = pci_write_legacy_io;
880 b->legacy_io->mmap = pci_mmap_legacy_io;
881 pci_adjust_legacy_attr(b, pci_mmap_io);
882 error = device_create_bin_file(&b->dev, b->legacy_io);
883 if (error)
884 goto legacy_io_err;
885
886 /* Allocated above after the legacy_io struct */
887 b->legacy_mem = b->legacy_io + 1;
888 sysfs_bin_attr_init(b->legacy_mem);
889 b->legacy_mem->attr.name = "legacy_mem";
890 b->legacy_mem->size = 1024*1024;
891 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
892 b->legacy_mem->mmap = pci_mmap_legacy_mem;
893 pci_adjust_legacy_attr(b, pci_mmap_mem);
894 error = device_create_bin_file(&b->dev, b->legacy_mem);
895 if (error)
896 goto legacy_mem_err;
897
898 return;
899
900legacy_mem_err:
901 device_remove_bin_file(&b->dev, b->legacy_io);
902legacy_io_err:
903 kfree(b->legacy_io);
904 b->legacy_io = NULL;
905kzalloc_err:
906 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
907 "and ISA memory resources to sysfs\n");
908 return;
909}
910
911void pci_remove_legacy_files(struct pci_bus *b)
912{
913 if (b->legacy_io) {
914 device_remove_bin_file(&b->dev, b->legacy_io);
915 device_remove_bin_file(&b->dev, b->legacy_mem);
916 kfree(b->legacy_io); /* both are allocated here */
917 }
918}
919#endif /* HAVE_PCI_LEGACY */
920
921#ifdef HAVE_PCI_MMAP
922
923int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
924 enum pci_mmap_api mmap_api)
925{
926 unsigned long nr, start, size, pci_start;
927
928 if (pci_resource_len(pdev, resno) == 0)
929 return 0;
930 nr = vma_pages(vma);
931 start = vma->vm_pgoff;
932 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
933 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
934 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
935 if (start >= pci_start && start < pci_start + size &&
936 start + nr <= pci_start + size)
937 return 1;
938 return 0;
939}
940
941/**
942 * pci_mmap_resource - map a PCI resource into user memory space
943 * @kobj: kobject for mapping
944 * @attr: struct bin_attribute for the file being mapped
945 * @vma: struct vm_area_struct passed into the mmap
946 * @write_combine: 1 for write_combine mapping
947 *
948 * Use the regular PCI mapping routines to map a PCI resource into userspace.
949 */
950static int
951pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
952 struct vm_area_struct *vma, int write_combine)
953{
954 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
955 struct device, kobj));
956 struct resource *res = attr->private;
957 enum pci_mmap_state mmap_type;
958 resource_size_t start, end;
959 int i;
960
961 for (i = 0; i < PCI_ROM_RESOURCE; i++)
962 if (res == &pdev->resource[i])
963 break;
964 if (i >= PCI_ROM_RESOURCE)
965 return -ENODEV;
966
967 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
968 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
969 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
970 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
971 pci_name(pdev), i,
972 (u64)pci_resource_start(pdev, i),
973 (u64)pci_resource_len(pdev, i));
974 return -EINVAL;
975 }
976
977 /* pci_mmap_page_range() expects the same kind of entry as coming
978 * from /proc/bus/pci/ which is a "user visible" value. If this is
979 * different from the resource itself, arch will do necessary fixup.
980 */
981 pci_resource_to_user(pdev, i, res, &start, &end);
982 vma->vm_pgoff += start >> PAGE_SHIFT;
983 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
984
985 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
986 return -EINVAL;
987
988 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
989}
990
991static int
992pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
993 struct bin_attribute *attr,
994 struct vm_area_struct *vma)
995{
996 return pci_mmap_resource(kobj, attr, vma, 0);
997}
998
999static int
1000pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1001 struct bin_attribute *attr,
1002 struct vm_area_struct *vma)
1003{
1004 return pci_mmap_resource(kobj, attr, vma, 1);
1005}
1006
1007static ssize_t
1008pci_resource_io(struct file *filp, struct kobject *kobj,
1009 struct bin_attribute *attr, char *buf,
1010 loff_t off, size_t count, bool write)
1011{
1012 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1013 struct device, kobj));
1014 struct resource *res = attr->private;
1015 unsigned long port = off;
1016 int i;
1017
1018 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1019 if (res == &pdev->resource[i])
1020 break;
1021 if (i >= PCI_ROM_RESOURCE)
1022 return -ENODEV;
1023
1024 port += pci_resource_start(pdev, i);
1025
1026 if (port > pci_resource_end(pdev, i))
1027 return 0;
1028
1029 if (port + count - 1 > pci_resource_end(pdev, i))
1030 return -EINVAL;
1031
1032 switch (count) {
1033 case 1:
1034 if (write)
1035 outb(*(u8 *)buf, port);
1036 else
1037 *(u8 *)buf = inb(port);
1038 return 1;
1039 case 2:
1040 if (write)
1041 outw(*(u16 *)buf, port);
1042 else
1043 *(u16 *)buf = inw(port);
1044 return 2;
1045 case 4:
1046 if (write)
1047 outl(*(u32 *)buf, port);
1048 else
1049 *(u32 *)buf = inl(port);
1050 return 4;
1051 }
1052 return -EINVAL;
1053}
1054
1055static ssize_t
1056pci_read_resource_io(struct file *filp, struct kobject *kobj,
1057 struct bin_attribute *attr, char *buf,
1058 loff_t off, size_t count)
1059{
1060 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1061}
1062
1063static ssize_t
1064pci_write_resource_io(struct file *filp, struct kobject *kobj,
1065 struct bin_attribute *attr, char *buf,
1066 loff_t off, size_t count)
1067{
1068 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1069}
1070
1071/**
1072 * pci_remove_resource_files - cleanup resource files
1073 * @pdev: dev to cleanup
1074 *
1075 * If we created resource files for @pdev, remove them from sysfs and
1076 * free their resources.
1077 */
1078static void
1079pci_remove_resource_files(struct pci_dev *pdev)
1080{
1081 int i;
1082
1083 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1084 struct bin_attribute *res_attr;
1085
1086 res_attr = pdev->res_attr[i];
1087 if (res_attr) {
1088 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1089 kfree(res_attr);
1090 }
1091
1092 res_attr = pdev->res_attr_wc[i];
1093 if (res_attr) {
1094 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1095 kfree(res_attr);
1096 }
1097 }
1098}
1099
1100static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1101{
1102 /* allocate attribute structure, piggyback attribute name */
1103 int name_len = write_combine ? 13 : 10;
1104 struct bin_attribute *res_attr;
1105 int retval;
1106
1107 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1108 if (res_attr) {
1109 char *res_attr_name = (char *)(res_attr + 1);
1110
1111 sysfs_bin_attr_init(res_attr);
1112 if (write_combine) {
1113 pdev->res_attr_wc[num] = res_attr;
1114 sprintf(res_attr_name, "resource%d_wc", num);
1115 res_attr->mmap = pci_mmap_resource_wc;
1116 } else {
1117 pdev->res_attr[num] = res_attr;
1118 sprintf(res_attr_name, "resource%d", num);
1119 res_attr->mmap = pci_mmap_resource_uc;
1120 }
1121 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1122 res_attr->read = pci_read_resource_io;
1123 res_attr->write = pci_write_resource_io;
1124 }
1125 res_attr->attr.name = res_attr_name;
1126 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1127 res_attr->size = pci_resource_len(pdev, num);
1128 res_attr->private = &pdev->resource[num];
1129 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1130 } else
1131 retval = -ENOMEM;
1132
1133 return retval;
1134}
1135
1136/**
1137 * pci_create_resource_files - create resource files in sysfs for @dev
1138 * @pdev: dev in question
1139 *
1140 * Walk the resources in @pdev creating files for each resource available.
1141 */
1142static int pci_create_resource_files(struct pci_dev *pdev)
1143{
1144 int i;
1145 int retval;
1146
1147 /* Expose the PCI resources from this device as files */
1148 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1149
1150 /* skip empty resources */
1151 if (!pci_resource_len(pdev, i))
1152 continue;
1153
1154 retval = pci_create_attr(pdev, i, 0);
1155 /* for prefetchable resources, create a WC mappable file */
1156 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1157 retval = pci_create_attr(pdev, i, 1);
1158
1159 if (retval) {
1160 pci_remove_resource_files(pdev);
1161 return retval;
1162 }
1163 }
1164 return 0;
1165}
1166#else /* !HAVE_PCI_MMAP */
1167int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1168void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1169#endif /* HAVE_PCI_MMAP */
1170
1171/**
1172 * pci_write_rom - used to enable access to the PCI ROM display
1173 * @filp: sysfs file
1174 * @kobj: kernel object handle
1175 * @bin_attr: struct bin_attribute for this file
1176 * @buf: user input
1177 * @off: file offset
1178 * @count: number of byte in input
1179 *
1180 * writing anything except 0 enables it
1181 */
1182static ssize_t
1183pci_write_rom(struct file *filp, struct kobject *kobj,
1184 struct bin_attribute *bin_attr,
1185 char *buf, loff_t off, size_t count)
1186{
1187 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1188
1189 if ((off == 0) && (*buf == '0') && (count == 2))
1190 pdev->rom_attr_enabled = 0;
1191 else
1192 pdev->rom_attr_enabled = 1;
1193
1194 return count;
1195}
1196
1197/**
1198 * pci_read_rom - read a PCI ROM
1199 * @filp: sysfs file
1200 * @kobj: kernel object handle
1201 * @bin_attr: struct bin_attribute for this file
1202 * @buf: where to put the data we read from the ROM
1203 * @off: file offset
1204 * @count: number of bytes to read
1205 *
1206 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1207 * device corresponding to @kobj.
1208 */
1209static ssize_t
1210pci_read_rom(struct file *filp, struct kobject *kobj,
1211 struct bin_attribute *bin_attr,
1212 char *buf, loff_t off, size_t count)
1213{
1214 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1215 void __iomem *rom;
1216 size_t size;
1217
1218 if (!pdev->rom_attr_enabled)
1219 return -EINVAL;
1220
1221 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1222 if (!rom || !size)
1223 return -EIO;
1224
1225 if (off >= size)
1226 count = 0;
1227 else {
1228 if (off + count > size)
1229 count = size - off;
1230
1231 memcpy_fromio(buf, rom + off, count);
1232 }
1233 pci_unmap_rom(pdev, rom);
1234
1235 return count;
1236}
1237
1238static struct bin_attribute pci_config_attr = {
1239 .attr = {
1240 .name = "config",
1241 .mode = S_IRUGO | S_IWUSR,
1242 },
1243 .size = PCI_CFG_SPACE_SIZE,
1244 .read = pci_read_config,
1245 .write = pci_write_config,
1246};
1247
1248static struct bin_attribute pcie_config_attr = {
1249 .attr = {
1250 .name = "config",
1251 .mode = S_IRUGO | S_IWUSR,
1252 },
1253 .size = PCI_CFG_SPACE_EXP_SIZE,
1254 .read = pci_read_config,
1255 .write = pci_write_config,
1256};
1257
1258int __weak pcibios_add_platform_entries(struct pci_dev *dev)
1259{
1260 return 0;
1261}
1262
1263static ssize_t reset_store(struct device *dev,
1264 struct device_attribute *attr, const char *buf,
1265 size_t count)
1266{
1267 struct pci_dev *pdev = to_pci_dev(dev);
1268 unsigned long val;
1269 ssize_t result = kstrtoul(buf, 0, &val);
1270
1271 if (result < 0)
1272 return result;
1273
1274 if (val != 1)
1275 return -EINVAL;
1276
1277 result = pci_reset_function(pdev);
1278 if (result < 0)
1279 return result;
1280
1281 return count;
1282}
1283
1284static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1285
1286static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1287{
1288 int retval;
1289 struct bin_attribute *attr;
1290
1291 /* If the device has VPD, try to expose it in sysfs. */
1292 if (dev->vpd) {
1293 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1294 if (!attr)
1295 return -ENOMEM;
1296
1297 sysfs_bin_attr_init(attr);
1298 attr->size = dev->vpd->len;
1299 attr->attr.name = "vpd";
1300 attr->attr.mode = S_IRUSR | S_IWUSR;
1301 attr->read = read_vpd_attr;
1302 attr->write = write_vpd_attr;
1303 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1304 if (retval) {
1305 kfree(attr);
1306 return retval;
1307 }
1308 dev->vpd->attr = attr;
1309 }
1310
1311 /* Active State Power Management */
1312 pcie_aspm_create_sysfs_dev_files(dev);
1313
1314 if (!pci_probe_reset_function(dev)) {
1315 retval = device_create_file(&dev->dev, &reset_attr);
1316 if (retval)
1317 goto error;
1318 dev->reset_fn = 1;
1319 }
1320 return 0;
1321
1322error:
1323 pcie_aspm_remove_sysfs_dev_files(dev);
1324 if (dev->vpd && dev->vpd->attr) {
1325 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1326 kfree(dev->vpd->attr);
1327 }
1328
1329 return retval;
1330}
1331
1332int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1333{
1334 int retval;
1335 int rom_size = 0;
1336 struct bin_attribute *attr;
1337
1338 if (!sysfs_initialized)
1339 return -EACCES;
1340
1341 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1342 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1343 else
1344 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1345 if (retval)
1346 goto err;
1347
1348 retval = pci_create_resource_files(pdev);
1349 if (retval)
1350 goto err_config_file;
1351
1352 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1353 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1354 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1355 rom_size = 0x20000;
1356
1357 /* If the device has a ROM, try to expose it in sysfs. */
1358 if (rom_size) {
1359 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1360 if (!attr) {
1361 retval = -ENOMEM;
1362 goto err_resource_files;
1363 }
1364 sysfs_bin_attr_init(attr);
1365 attr->size = rom_size;
1366 attr->attr.name = "rom";
1367 attr->attr.mode = S_IRUSR | S_IWUSR;
1368 attr->read = pci_read_rom;
1369 attr->write = pci_write_rom;
1370 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1371 if (retval) {
1372 kfree(attr);
1373 goto err_resource_files;
1374 }
1375 pdev->rom_attr = attr;
1376 }
1377
1378 /* add platform-specific attributes */
1379 retval = pcibios_add_platform_entries(pdev);
1380 if (retval)
1381 goto err_rom_file;
1382
1383 /* add sysfs entries for various capabilities */
1384 retval = pci_create_capabilities_sysfs(pdev);
1385 if (retval)
1386 goto err_rom_file;
1387
1388 pci_create_firmware_label_files(pdev);
1389
1390 return 0;
1391
1392err_rom_file:
1393 if (rom_size) {
1394 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1395 kfree(pdev->rom_attr);
1396 pdev->rom_attr = NULL;
1397 }
1398err_resource_files:
1399 pci_remove_resource_files(pdev);
1400err_config_file:
1401 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1402 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1403 else
1404 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1405err:
1406 return retval;
1407}
1408
1409static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1410{
1411 if (dev->vpd && dev->vpd->attr) {
1412 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1413 kfree(dev->vpd->attr);
1414 }
1415
1416 pcie_aspm_remove_sysfs_dev_files(dev);
1417 if (dev->reset_fn) {
1418 device_remove_file(&dev->dev, &reset_attr);
1419 dev->reset_fn = 0;
1420 }
1421}
1422
1423/**
1424 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1425 * @pdev: device whose entries we should free
1426 *
1427 * Cleanup when @pdev is removed from sysfs.
1428 */
1429void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1430{
1431 int rom_size = 0;
1432
1433 if (!sysfs_initialized)
1434 return;
1435
1436 pci_remove_capabilities_sysfs(pdev);
1437
1438 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1439 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1440 else
1441 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1442
1443 pci_remove_resource_files(pdev);
1444
1445 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1446 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1447 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1448 rom_size = 0x20000;
1449
1450 if (rom_size && pdev->rom_attr) {
1451 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1452 kfree(pdev->rom_attr);
1453 }
1454
1455 pci_remove_firmware_label_files(pdev);
1456
1457}
1458
1459static int __init pci_sysfs_init(void)
1460{
1461 struct pci_dev *pdev = NULL;
1462 int retval;
1463
1464 sysfs_initialized = 1;
1465 for_each_pci_dev(pdev) {
1466 retval = pci_create_sysfs_dev_files(pdev);
1467 if (retval) {
1468 pci_dev_put(pdev);
1469 return retval;
1470 }
1471 }
1472
1473 return 0;
1474}
1475
1476late_initcall(pci_sysfs_init);
1477
1478static struct attribute *pci_dev_dev_attrs[] = {
1479 &vga_attr.attr,
1480 NULL,
1481};
1482
1483static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1484 struct attribute *a, int n)
1485{
1486 struct device *dev = container_of(kobj, struct device, kobj);
1487 struct pci_dev *pdev = to_pci_dev(dev);
1488
1489 if (a == &vga_attr.attr)
1490 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1491 return 0;
1492
1493 return a->mode;
1494}
1495
1496static struct attribute *pci_dev_hp_attrs[] = {
1497 &dev_remove_attr.attr,
1498 &dev_rescan_attr.attr,
1499 NULL,
1500};
1501
1502static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1503 struct attribute *a, int n)
1504{
1505 struct device *dev = container_of(kobj, struct device, kobj);
1506 struct pci_dev *pdev = to_pci_dev(dev);
1507
1508 if (pdev->is_virtfn)
1509 return 0;
1510
1511 return a->mode;
1512}
1513
1514static struct attribute_group pci_dev_hp_attr_group = {
1515 .attrs = pci_dev_hp_attrs,
1516 .is_visible = pci_dev_hp_attrs_are_visible,
1517};
1518
1519#ifdef CONFIG_PCI_IOV
1520static struct attribute *sriov_dev_attrs[] = {
1521 &sriov_totalvfs_attr.attr,
1522 &sriov_numvfs_attr.attr,
1523 NULL,
1524};
1525
1526static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1527 struct attribute *a, int n)
1528{
1529 struct device *dev = container_of(kobj, struct device, kobj);
1530
1531 if (!dev_is_pf(dev))
1532 return 0;
1533
1534 return a->mode;
1535}
1536
1537static struct attribute_group sriov_dev_attr_group = {
1538 .attrs = sriov_dev_attrs,
1539 .is_visible = sriov_attrs_are_visible,
1540};
1541#endif /* CONFIG_PCI_IOV */
1542
1543static struct attribute_group pci_dev_attr_group = {
1544 .attrs = pci_dev_dev_attrs,
1545 .is_visible = pci_dev_attrs_are_visible,
1546};
1547
1548static const struct attribute_group *pci_dev_attr_groups[] = {
1549 &pci_dev_attr_group,
1550 &pci_dev_hp_attr_group,
1551#ifdef CONFIG_PCI_IOV
1552 &sriov_dev_attr_group,
1553#endif
1554 NULL,
1555};
1556
1557struct device_type pci_dev_type = {
1558 .groups = pci_dev_attr_groups,
1559};