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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
4 * (C) Copyright 2002-2004 IBM Corp.
5 * (C) Copyright 2003 Matthew Wilcox
6 * (C) Copyright 2003 Hewlett-Packard
7 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
8 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
9 *
10 * File attributes for PCI devices
11 *
12 * Modeled after usb's driverfs.c
13 */
14
15#include <linux/bitfield.h>
16#include <linux/kernel.h>
17#include <linux/sched.h>
18#include <linux/pci.h>
19#include <linux/stat.h>
20#include <linux/export.h>
21#include <linux/topology.h>
22#include <linux/mm.h>
23#include <linux/fs.h>
24#include <linux/capability.h>
25#include <linux/security.h>
26#include <linux/slab.h>
27#include <linux/vgaarb.h>
28#include <linux/pm_runtime.h>
29#include <linux/msi.h>
30#include <linux/of.h>
31#include <linux/aperture.h>
32#include "pci.h"
33
34#ifndef ARCH_PCI_DEV_GROUPS
35#define ARCH_PCI_DEV_GROUPS
36#endif
37
38static int sysfs_initialized; /* = 0 */
39
40/* show configuration fields */
41#define pci_config_attr(field, format_string) \
42static ssize_t \
43field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
44{ \
45 struct pci_dev *pdev; \
46 \
47 pdev = to_pci_dev(dev); \
48 return sysfs_emit(buf, format_string, pdev->field); \
49} \
50static DEVICE_ATTR_RO(field)
51
52pci_config_attr(vendor, "0x%04x\n");
53pci_config_attr(device, "0x%04x\n");
54pci_config_attr(subsystem_vendor, "0x%04x\n");
55pci_config_attr(subsystem_device, "0x%04x\n");
56pci_config_attr(revision, "0x%02x\n");
57pci_config_attr(class, "0x%06x\n");
58
59static ssize_t irq_show(struct device *dev,
60 struct device_attribute *attr,
61 char *buf)
62{
63 struct pci_dev *pdev = to_pci_dev(dev);
64
65#ifdef CONFIG_PCI_MSI
66 /*
67 * For MSI, show the first MSI IRQ; for all other cases including
68 * MSI-X, show the legacy INTx IRQ.
69 */
70 if (pdev->msi_enabled)
71 return sysfs_emit(buf, "%u\n", pci_irq_vector(pdev, 0));
72#endif
73
74 return sysfs_emit(buf, "%u\n", pdev->irq);
75}
76static DEVICE_ATTR_RO(irq);
77
78static ssize_t broken_parity_status_show(struct device *dev,
79 struct device_attribute *attr,
80 char *buf)
81{
82 struct pci_dev *pdev = to_pci_dev(dev);
83 return sysfs_emit(buf, "%u\n", pdev->broken_parity_status);
84}
85
86static ssize_t broken_parity_status_store(struct device *dev,
87 struct device_attribute *attr,
88 const char *buf, size_t count)
89{
90 struct pci_dev *pdev = to_pci_dev(dev);
91 unsigned long val;
92
93 if (kstrtoul(buf, 0, &val) < 0)
94 return -EINVAL;
95
96 pdev->broken_parity_status = !!val;
97
98 return count;
99}
100static DEVICE_ATTR_RW(broken_parity_status);
101
102static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
103 struct device_attribute *attr, char *buf)
104{
105 const struct cpumask *mask;
106
107#ifdef CONFIG_NUMA
108 if (dev_to_node(dev) == NUMA_NO_NODE)
109 mask = cpu_online_mask;
110 else
111 mask = cpumask_of_node(dev_to_node(dev));
112#else
113 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
114#endif
115 return cpumap_print_to_pagebuf(list, buf, mask);
116}
117
118static ssize_t local_cpus_show(struct device *dev,
119 struct device_attribute *attr, char *buf)
120{
121 return pci_dev_show_local_cpu(dev, false, attr, buf);
122}
123static DEVICE_ATTR_RO(local_cpus);
124
125static ssize_t local_cpulist_show(struct device *dev,
126 struct device_attribute *attr, char *buf)
127{
128 return pci_dev_show_local_cpu(dev, true, attr, buf);
129}
130static DEVICE_ATTR_RO(local_cpulist);
131
132/*
133 * PCI Bus Class Devices
134 */
135static ssize_t cpuaffinity_show(struct device *dev,
136 struct device_attribute *attr, char *buf)
137{
138 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
139
140 return cpumap_print_to_pagebuf(false, buf, cpumask);
141}
142static DEVICE_ATTR_RO(cpuaffinity);
143
144static ssize_t cpulistaffinity_show(struct device *dev,
145 struct device_attribute *attr, char *buf)
146{
147 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
148
149 return cpumap_print_to_pagebuf(true, buf, cpumask);
150}
151static DEVICE_ATTR_RO(cpulistaffinity);
152
153static ssize_t power_state_show(struct device *dev,
154 struct device_attribute *attr, char *buf)
155{
156 struct pci_dev *pdev = to_pci_dev(dev);
157
158 return sysfs_emit(buf, "%s\n", pci_power_name(pdev->current_state));
159}
160static DEVICE_ATTR_RO(power_state);
161
162/* show resources */
163static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
164 char *buf)
165{
166 struct pci_dev *pci_dev = to_pci_dev(dev);
167 int i;
168 int max;
169 resource_size_t start, end;
170 size_t len = 0;
171
172 if (pci_dev->subordinate)
173 max = DEVICE_COUNT_RESOURCE;
174 else
175 max = PCI_BRIDGE_RESOURCES;
176
177 for (i = 0; i < max; i++) {
178 struct resource *res = &pci_dev->resource[i];
179 pci_resource_to_user(pci_dev, i, res, &start, &end);
180 len += sysfs_emit_at(buf, len, "0x%016llx 0x%016llx 0x%016llx\n",
181 (unsigned long long)start,
182 (unsigned long long)end,
183 (unsigned long long)res->flags);
184 }
185 return len;
186}
187static DEVICE_ATTR_RO(resource);
188
189static ssize_t max_link_speed_show(struct device *dev,
190 struct device_attribute *attr, char *buf)
191{
192 struct pci_dev *pdev = to_pci_dev(dev);
193
194 return sysfs_emit(buf, "%s\n",
195 pci_speed_string(pcie_get_speed_cap(pdev)));
196}
197static DEVICE_ATTR_RO(max_link_speed);
198
199static ssize_t max_link_width_show(struct device *dev,
200 struct device_attribute *attr, char *buf)
201{
202 struct pci_dev *pdev = to_pci_dev(dev);
203
204 return sysfs_emit(buf, "%u\n", pcie_get_width_cap(pdev));
205}
206static DEVICE_ATTR_RO(max_link_width);
207
208static ssize_t current_link_speed_show(struct device *dev,
209 struct device_attribute *attr, char *buf)
210{
211 struct pci_dev *pci_dev = to_pci_dev(dev);
212 u16 linkstat;
213 int err;
214 enum pci_bus_speed speed;
215
216 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
217 if (err)
218 return -EINVAL;
219
220 speed = pcie_link_speed[linkstat & PCI_EXP_LNKSTA_CLS];
221
222 return sysfs_emit(buf, "%s\n", pci_speed_string(speed));
223}
224static DEVICE_ATTR_RO(current_link_speed);
225
226static ssize_t current_link_width_show(struct device *dev,
227 struct device_attribute *attr, char *buf)
228{
229 struct pci_dev *pci_dev = to_pci_dev(dev);
230 u16 linkstat;
231 int err;
232
233 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
234 if (err)
235 return -EINVAL;
236
237 return sysfs_emit(buf, "%u\n", FIELD_GET(PCI_EXP_LNKSTA_NLW, linkstat));
238}
239static DEVICE_ATTR_RO(current_link_width);
240
241static ssize_t secondary_bus_number_show(struct device *dev,
242 struct device_attribute *attr,
243 char *buf)
244{
245 struct pci_dev *pci_dev = to_pci_dev(dev);
246 u8 sec_bus;
247 int err;
248
249 err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
250 if (err)
251 return -EINVAL;
252
253 return sysfs_emit(buf, "%u\n", sec_bus);
254}
255static DEVICE_ATTR_RO(secondary_bus_number);
256
257static ssize_t subordinate_bus_number_show(struct device *dev,
258 struct device_attribute *attr,
259 char *buf)
260{
261 struct pci_dev *pci_dev = to_pci_dev(dev);
262 u8 sub_bus;
263 int err;
264
265 err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
266 if (err)
267 return -EINVAL;
268
269 return sysfs_emit(buf, "%u\n", sub_bus);
270}
271static DEVICE_ATTR_RO(subordinate_bus_number);
272
273static ssize_t ari_enabled_show(struct device *dev,
274 struct device_attribute *attr,
275 char *buf)
276{
277 struct pci_dev *pci_dev = to_pci_dev(dev);
278
279 return sysfs_emit(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
280}
281static DEVICE_ATTR_RO(ari_enabled);
282
283static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
284 char *buf)
285{
286 struct pci_dev *pci_dev = to_pci_dev(dev);
287
288 return sysfs_emit(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
289 pci_dev->vendor, pci_dev->device,
290 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
291 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
292 (u8)(pci_dev->class));
293}
294static DEVICE_ATTR_RO(modalias);
295
296static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
297 const char *buf, size_t count)
298{
299 struct pci_dev *pdev = to_pci_dev(dev);
300 unsigned long val;
301 ssize_t result = 0;
302
303 /* this can crash the machine when done on the "wrong" device */
304 if (!capable(CAP_SYS_ADMIN))
305 return -EPERM;
306
307 if (kstrtoul(buf, 0, &val) < 0)
308 return -EINVAL;
309
310 device_lock(dev);
311 if (dev->driver)
312 result = -EBUSY;
313 else if (val)
314 result = pci_enable_device(pdev);
315 else if (pci_is_enabled(pdev))
316 pci_disable_device(pdev);
317 else
318 result = -EIO;
319 device_unlock(dev);
320
321 return result < 0 ? result : count;
322}
323
324static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
325 char *buf)
326{
327 struct pci_dev *pdev;
328
329 pdev = to_pci_dev(dev);
330 return sysfs_emit(buf, "%u\n", atomic_read(&pdev->enable_cnt));
331}
332static DEVICE_ATTR_RW(enable);
333
334#ifdef CONFIG_NUMA
335static ssize_t numa_node_store(struct device *dev,
336 struct device_attribute *attr, const char *buf,
337 size_t count)
338{
339 struct pci_dev *pdev = to_pci_dev(dev);
340 int node;
341
342 if (!capable(CAP_SYS_ADMIN))
343 return -EPERM;
344
345 if (kstrtoint(buf, 0, &node) < 0)
346 return -EINVAL;
347
348 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
349 return -EINVAL;
350
351 if (node != NUMA_NO_NODE && !node_online(node))
352 return -EINVAL;
353
354 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
355 pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
356 node);
357
358 dev->numa_node = node;
359 return count;
360}
361
362static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
363 char *buf)
364{
365 return sysfs_emit(buf, "%d\n", dev->numa_node);
366}
367static DEVICE_ATTR_RW(numa_node);
368#endif
369
370static ssize_t dma_mask_bits_show(struct device *dev,
371 struct device_attribute *attr, char *buf)
372{
373 struct pci_dev *pdev = to_pci_dev(dev);
374
375 return sysfs_emit(buf, "%d\n", fls64(pdev->dma_mask));
376}
377static DEVICE_ATTR_RO(dma_mask_bits);
378
379static ssize_t consistent_dma_mask_bits_show(struct device *dev,
380 struct device_attribute *attr,
381 char *buf)
382{
383 return sysfs_emit(buf, "%d\n", fls64(dev->coherent_dma_mask));
384}
385static DEVICE_ATTR_RO(consistent_dma_mask_bits);
386
387static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
388 char *buf)
389{
390 struct pci_dev *pdev = to_pci_dev(dev);
391 struct pci_bus *subordinate = pdev->subordinate;
392
393 return sysfs_emit(buf, "%u\n", subordinate ?
394 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
395 : !pdev->no_msi);
396}
397
398static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
399 const char *buf, size_t count)
400{
401 struct pci_dev *pdev = to_pci_dev(dev);
402 struct pci_bus *subordinate = pdev->subordinate;
403 unsigned long val;
404
405 if (!capable(CAP_SYS_ADMIN))
406 return -EPERM;
407
408 if (kstrtoul(buf, 0, &val) < 0)
409 return -EINVAL;
410
411 /*
412 * "no_msi" and "bus_flags" only affect what happens when a driver
413 * requests MSI or MSI-X. They don't affect any drivers that have
414 * already requested MSI or MSI-X.
415 */
416 if (!subordinate) {
417 pdev->no_msi = !val;
418 pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
419 val ? "allowed" : "disallowed");
420 return count;
421 }
422
423 if (val)
424 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
425 else
426 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
427
428 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
429 val ? "allowed" : "disallowed");
430 return count;
431}
432static DEVICE_ATTR_RW(msi_bus);
433
434static ssize_t rescan_store(const struct bus_type *bus, const char *buf, size_t count)
435{
436 unsigned long val;
437 struct pci_bus *b = NULL;
438
439 if (kstrtoul(buf, 0, &val) < 0)
440 return -EINVAL;
441
442 if (val) {
443 pci_lock_rescan_remove();
444 while ((b = pci_find_next_bus(b)) != NULL)
445 pci_rescan_bus(b);
446 pci_unlock_rescan_remove();
447 }
448 return count;
449}
450static BUS_ATTR_WO(rescan);
451
452static struct attribute *pci_bus_attrs[] = {
453 &bus_attr_rescan.attr,
454 NULL,
455};
456
457static const struct attribute_group pci_bus_group = {
458 .attrs = pci_bus_attrs,
459};
460
461const struct attribute_group *pci_bus_groups[] = {
462 &pci_bus_group,
463 NULL,
464};
465
466static ssize_t dev_rescan_store(struct device *dev,
467 struct device_attribute *attr, const char *buf,
468 size_t count)
469{
470 unsigned long val;
471 struct pci_dev *pdev = to_pci_dev(dev);
472
473 if (kstrtoul(buf, 0, &val) < 0)
474 return -EINVAL;
475
476 if (val) {
477 pci_lock_rescan_remove();
478 pci_rescan_bus(pdev->bus);
479 pci_unlock_rescan_remove();
480 }
481 return count;
482}
483static struct device_attribute dev_attr_dev_rescan = __ATTR(rescan, 0200, NULL,
484 dev_rescan_store);
485
486static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
487 const char *buf, size_t count)
488{
489 unsigned long val;
490
491 if (kstrtoul(buf, 0, &val) < 0)
492 return -EINVAL;
493
494 if (val && device_remove_file_self(dev, attr))
495 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
496 return count;
497}
498static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0220, NULL,
499 remove_store);
500
501static ssize_t bus_rescan_store(struct device *dev,
502 struct device_attribute *attr,
503 const char *buf, size_t count)
504{
505 unsigned long val;
506 struct pci_bus *bus = to_pci_bus(dev);
507
508 if (kstrtoul(buf, 0, &val) < 0)
509 return -EINVAL;
510
511 if (val) {
512 pci_lock_rescan_remove();
513 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
514 pci_rescan_bus_bridge_resize(bus->self);
515 else
516 pci_rescan_bus(bus);
517 pci_unlock_rescan_remove();
518 }
519 return count;
520}
521static struct device_attribute dev_attr_bus_rescan = __ATTR(rescan, 0200, NULL,
522 bus_rescan_store);
523
524static ssize_t reset_subordinate_store(struct device *dev,
525 struct device_attribute *attr,
526 const char *buf, size_t count)
527{
528 struct pci_dev *pdev = to_pci_dev(dev);
529 struct pci_bus *bus = pdev->subordinate;
530 unsigned long val;
531
532 if (!capable(CAP_SYS_ADMIN))
533 return -EPERM;
534
535 if (kstrtoul(buf, 0, &val) < 0)
536 return -EINVAL;
537
538 if (val) {
539 int ret = __pci_reset_bus(bus);
540
541 if (ret)
542 return ret;
543 }
544
545 return count;
546}
547static DEVICE_ATTR_WO(reset_subordinate);
548
549#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
550static ssize_t d3cold_allowed_store(struct device *dev,
551 struct device_attribute *attr,
552 const char *buf, size_t count)
553{
554 struct pci_dev *pdev = to_pci_dev(dev);
555 unsigned long val;
556
557 if (kstrtoul(buf, 0, &val) < 0)
558 return -EINVAL;
559
560 pdev->d3cold_allowed = !!val;
561 pci_bridge_d3_update(pdev);
562
563 pm_runtime_resume(dev);
564
565 return count;
566}
567
568static ssize_t d3cold_allowed_show(struct device *dev,
569 struct device_attribute *attr, char *buf)
570{
571 struct pci_dev *pdev = to_pci_dev(dev);
572 return sysfs_emit(buf, "%u\n", pdev->d3cold_allowed);
573}
574static DEVICE_ATTR_RW(d3cold_allowed);
575#endif
576
577#ifdef CONFIG_OF
578static ssize_t devspec_show(struct device *dev,
579 struct device_attribute *attr, char *buf)
580{
581 struct pci_dev *pdev = to_pci_dev(dev);
582 struct device_node *np = pci_device_to_OF_node(pdev);
583
584 if (np == NULL)
585 return 0;
586 return sysfs_emit(buf, "%pOF\n", np);
587}
588static DEVICE_ATTR_RO(devspec);
589#endif
590
591static ssize_t driver_override_store(struct device *dev,
592 struct device_attribute *attr,
593 const char *buf, size_t count)
594{
595 struct pci_dev *pdev = to_pci_dev(dev);
596 int ret;
597
598 ret = driver_set_override(dev, &pdev->driver_override, buf, count);
599 if (ret)
600 return ret;
601
602 return count;
603}
604
605static ssize_t driver_override_show(struct device *dev,
606 struct device_attribute *attr, char *buf)
607{
608 struct pci_dev *pdev = to_pci_dev(dev);
609 ssize_t len;
610
611 device_lock(dev);
612 len = sysfs_emit(buf, "%s\n", pdev->driver_override);
613 device_unlock(dev);
614 return len;
615}
616static DEVICE_ATTR_RW(driver_override);
617
618static struct attribute *pci_dev_attrs[] = {
619 &dev_attr_power_state.attr,
620 &dev_attr_resource.attr,
621 &dev_attr_vendor.attr,
622 &dev_attr_device.attr,
623 &dev_attr_subsystem_vendor.attr,
624 &dev_attr_subsystem_device.attr,
625 &dev_attr_revision.attr,
626 &dev_attr_class.attr,
627 &dev_attr_irq.attr,
628 &dev_attr_local_cpus.attr,
629 &dev_attr_local_cpulist.attr,
630 &dev_attr_modalias.attr,
631#ifdef CONFIG_NUMA
632 &dev_attr_numa_node.attr,
633#endif
634 &dev_attr_dma_mask_bits.attr,
635 &dev_attr_consistent_dma_mask_bits.attr,
636 &dev_attr_enable.attr,
637 &dev_attr_broken_parity_status.attr,
638 &dev_attr_msi_bus.attr,
639#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
640 &dev_attr_d3cold_allowed.attr,
641#endif
642#ifdef CONFIG_OF
643 &dev_attr_devspec.attr,
644#endif
645 &dev_attr_driver_override.attr,
646 &dev_attr_ari_enabled.attr,
647 NULL,
648};
649
650static struct attribute *pci_bridge_attrs[] = {
651 &dev_attr_subordinate_bus_number.attr,
652 &dev_attr_secondary_bus_number.attr,
653 &dev_attr_reset_subordinate.attr,
654 NULL,
655};
656
657static struct attribute *pcie_dev_attrs[] = {
658 &dev_attr_current_link_speed.attr,
659 &dev_attr_current_link_width.attr,
660 &dev_attr_max_link_width.attr,
661 &dev_attr_max_link_speed.attr,
662 NULL,
663};
664
665static struct attribute *pcibus_attrs[] = {
666 &dev_attr_bus_rescan.attr,
667 &dev_attr_cpuaffinity.attr,
668 &dev_attr_cpulistaffinity.attr,
669 NULL,
670};
671
672static const struct attribute_group pcibus_group = {
673 .attrs = pcibus_attrs,
674};
675
676const struct attribute_group *pcibus_groups[] = {
677 &pcibus_group,
678 NULL,
679};
680
681static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
682 char *buf)
683{
684 struct pci_dev *pdev = to_pci_dev(dev);
685 struct pci_dev *vga_dev = vga_default_device();
686
687 if (vga_dev)
688 return sysfs_emit(buf, "%u\n", (pdev == vga_dev));
689
690 return sysfs_emit(buf, "%u\n",
691 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
692 IORESOURCE_ROM_SHADOW));
693}
694static DEVICE_ATTR_RO(boot_vga);
695
696static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
697 struct bin_attribute *bin_attr, char *buf,
698 loff_t off, size_t count)
699{
700 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
701 unsigned int size = 64;
702 loff_t init_off = off;
703 u8 *data = (u8 *) buf;
704
705 /* Several chips lock up trying to read undefined config space */
706 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
707 size = dev->cfg_size;
708 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
709 size = 128;
710
711 if (off > size)
712 return 0;
713 if (off + count > size) {
714 size -= off;
715 count = size;
716 } else {
717 size = count;
718 }
719
720 pci_config_pm_runtime_get(dev);
721
722 if ((off & 1) && size) {
723 u8 val;
724 pci_user_read_config_byte(dev, off, &val);
725 data[off - init_off] = val;
726 off++;
727 size--;
728 }
729
730 if ((off & 3) && size > 2) {
731 u16 val;
732 pci_user_read_config_word(dev, off, &val);
733 data[off - init_off] = val & 0xff;
734 data[off - init_off + 1] = (val >> 8) & 0xff;
735 off += 2;
736 size -= 2;
737 }
738
739 while (size > 3) {
740 u32 val;
741 pci_user_read_config_dword(dev, off, &val);
742 data[off - init_off] = val & 0xff;
743 data[off - init_off + 1] = (val >> 8) & 0xff;
744 data[off - init_off + 2] = (val >> 16) & 0xff;
745 data[off - init_off + 3] = (val >> 24) & 0xff;
746 off += 4;
747 size -= 4;
748 cond_resched();
749 }
750
751 if (size >= 2) {
752 u16 val;
753 pci_user_read_config_word(dev, off, &val);
754 data[off - init_off] = val & 0xff;
755 data[off - init_off + 1] = (val >> 8) & 0xff;
756 off += 2;
757 size -= 2;
758 }
759
760 if (size > 0) {
761 u8 val;
762 pci_user_read_config_byte(dev, off, &val);
763 data[off - init_off] = val;
764 }
765
766 pci_config_pm_runtime_put(dev);
767
768 return count;
769}
770
771static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
772 struct bin_attribute *bin_attr, char *buf,
773 loff_t off, size_t count)
774{
775 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
776 unsigned int size = count;
777 loff_t init_off = off;
778 u8 *data = (u8 *) buf;
779 int ret;
780
781 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
782 if (ret)
783 return ret;
784
785 if (resource_is_exclusive(&dev->driver_exclusive_resource, off,
786 count)) {
787 pci_warn_once(dev, "%s: Unexpected write to kernel-exclusive config offset %llx",
788 current->comm, off);
789 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
790 }
791
792 if (off > dev->cfg_size)
793 return 0;
794 if (off + count > dev->cfg_size) {
795 size = dev->cfg_size - off;
796 count = size;
797 }
798
799 pci_config_pm_runtime_get(dev);
800
801 if ((off & 1) && size) {
802 pci_user_write_config_byte(dev, off, data[off - init_off]);
803 off++;
804 size--;
805 }
806
807 if ((off & 3) && size > 2) {
808 u16 val = data[off - init_off];
809 val |= (u16) data[off - init_off + 1] << 8;
810 pci_user_write_config_word(dev, off, val);
811 off += 2;
812 size -= 2;
813 }
814
815 while (size > 3) {
816 u32 val = data[off - init_off];
817 val |= (u32) data[off - init_off + 1] << 8;
818 val |= (u32) data[off - init_off + 2] << 16;
819 val |= (u32) data[off - init_off + 3] << 24;
820 pci_user_write_config_dword(dev, off, val);
821 off += 4;
822 size -= 4;
823 }
824
825 if (size >= 2) {
826 u16 val = data[off - init_off];
827 val |= (u16) data[off - init_off + 1] << 8;
828 pci_user_write_config_word(dev, off, val);
829 off += 2;
830 size -= 2;
831 }
832
833 if (size)
834 pci_user_write_config_byte(dev, off, data[off - init_off]);
835
836 pci_config_pm_runtime_put(dev);
837
838 return count;
839}
840static BIN_ATTR(config, 0644, pci_read_config, pci_write_config, 0);
841
842static struct bin_attribute *pci_dev_config_attrs[] = {
843 &bin_attr_config,
844 NULL,
845};
846
847static size_t pci_dev_config_attr_bin_size(struct kobject *kobj,
848 const struct bin_attribute *a,
849 int n)
850{
851 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
852
853 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
854 return PCI_CFG_SPACE_EXP_SIZE;
855 return PCI_CFG_SPACE_SIZE;
856}
857
858static const struct attribute_group pci_dev_config_attr_group = {
859 .bin_attrs = pci_dev_config_attrs,
860 .bin_size = pci_dev_config_attr_bin_size,
861};
862
863/*
864 * llseek operation for mmappable PCI resources.
865 * May be left unused if the arch doesn't provide them.
866 */
867static __maybe_unused loff_t
868pci_llseek_resource(struct file *filep,
869 struct kobject *kobj __always_unused,
870 const struct bin_attribute *attr,
871 loff_t offset, int whence)
872{
873 return fixed_size_llseek(filep, offset, whence, attr->size);
874}
875
876#ifdef HAVE_PCI_LEGACY
877/**
878 * pci_read_legacy_io - read byte(s) from legacy I/O port space
879 * @filp: open sysfs file
880 * @kobj: kobject corresponding to file to read from
881 * @bin_attr: struct bin_attribute for this file
882 * @buf: buffer to store results
883 * @off: offset into legacy I/O port space
884 * @count: number of bytes to read
885 *
886 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
887 * callback routine (pci_legacy_read).
888 */
889static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
890 struct bin_attribute *bin_attr, char *buf,
891 loff_t off, size_t count)
892{
893 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
894
895 /* Only support 1, 2 or 4 byte accesses */
896 if (count != 1 && count != 2 && count != 4)
897 return -EINVAL;
898
899 return pci_legacy_read(bus, off, (u32 *)buf, count);
900}
901
902/**
903 * pci_write_legacy_io - write byte(s) to legacy I/O port space
904 * @filp: open sysfs file
905 * @kobj: kobject corresponding to file to read from
906 * @bin_attr: struct bin_attribute for this file
907 * @buf: buffer containing value to be written
908 * @off: offset into legacy I/O port space
909 * @count: number of bytes to write
910 *
911 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
912 * callback routine (pci_legacy_write).
913 */
914static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
915 struct bin_attribute *bin_attr, char *buf,
916 loff_t off, size_t count)
917{
918 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
919
920 /* Only support 1, 2 or 4 byte accesses */
921 if (count != 1 && count != 2 && count != 4)
922 return -EINVAL;
923
924 return pci_legacy_write(bus, off, *(u32 *)buf, count);
925}
926
927/**
928 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
929 * @filp: open sysfs file
930 * @kobj: kobject corresponding to device to be mapped
931 * @attr: struct bin_attribute for this file
932 * @vma: struct vm_area_struct passed to mmap
933 *
934 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
935 * legacy memory space (first meg of bus space) into application virtual
936 * memory space.
937 */
938static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
939 const struct bin_attribute *attr,
940 struct vm_area_struct *vma)
941{
942 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
943
944 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
945}
946
947/**
948 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
949 * @filp: open sysfs file
950 * @kobj: kobject corresponding to device to be mapped
951 * @attr: struct bin_attribute for this file
952 * @vma: struct vm_area_struct passed to mmap
953 *
954 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
955 * legacy IO space (first meg of bus space) into application virtual
956 * memory space. Returns -ENOSYS if the operation isn't supported
957 */
958static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
959 const struct bin_attribute *attr,
960 struct vm_area_struct *vma)
961{
962 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
963
964 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
965}
966
967/**
968 * pci_adjust_legacy_attr - adjustment of legacy file attributes
969 * @b: bus to create files under
970 * @mmap_type: I/O port or memory
971 *
972 * Stub implementation. Can be overridden by arch if necessary.
973 */
974void __weak pci_adjust_legacy_attr(struct pci_bus *b,
975 enum pci_mmap_state mmap_type)
976{
977}
978
979/**
980 * pci_create_legacy_files - create legacy I/O port and memory files
981 * @b: bus to create files under
982 *
983 * Some platforms allow access to legacy I/O port and ISA memory space on
984 * a per-bus basis. This routine creates the files and ties them into
985 * their associated read, write and mmap files from pci-sysfs.c
986 *
987 * On error unwind, but don't propagate the error to the caller
988 * as it is ok to set up the PCI bus without these files.
989 */
990void pci_create_legacy_files(struct pci_bus *b)
991{
992 int error;
993
994 if (!sysfs_initialized)
995 return;
996
997 b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
998 GFP_ATOMIC);
999 if (!b->legacy_io)
1000 goto kzalloc_err;
1001
1002 sysfs_bin_attr_init(b->legacy_io);
1003 b->legacy_io->attr.name = "legacy_io";
1004 b->legacy_io->size = 0xffff;
1005 b->legacy_io->attr.mode = 0600;
1006 b->legacy_io->read = pci_read_legacy_io;
1007 b->legacy_io->write = pci_write_legacy_io;
1008 /* See pci_create_attr() for motivation */
1009 b->legacy_io->llseek = pci_llseek_resource;
1010 b->legacy_io->mmap = pci_mmap_legacy_io;
1011 b->legacy_io->f_mapping = iomem_get_mapping;
1012 pci_adjust_legacy_attr(b, pci_mmap_io);
1013 error = device_create_bin_file(&b->dev, b->legacy_io);
1014 if (error)
1015 goto legacy_io_err;
1016
1017 /* Allocated above after the legacy_io struct */
1018 b->legacy_mem = b->legacy_io + 1;
1019 sysfs_bin_attr_init(b->legacy_mem);
1020 b->legacy_mem->attr.name = "legacy_mem";
1021 b->legacy_mem->size = 1024*1024;
1022 b->legacy_mem->attr.mode = 0600;
1023 b->legacy_mem->mmap = pci_mmap_legacy_mem;
1024 /* See pci_create_attr() for motivation */
1025 b->legacy_mem->llseek = pci_llseek_resource;
1026 b->legacy_mem->f_mapping = iomem_get_mapping;
1027 pci_adjust_legacy_attr(b, pci_mmap_mem);
1028 error = device_create_bin_file(&b->dev, b->legacy_mem);
1029 if (error)
1030 goto legacy_mem_err;
1031
1032 return;
1033
1034legacy_mem_err:
1035 device_remove_bin_file(&b->dev, b->legacy_io);
1036legacy_io_err:
1037 kfree(b->legacy_io);
1038 b->legacy_io = NULL;
1039kzalloc_err:
1040 dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n");
1041}
1042
1043void pci_remove_legacy_files(struct pci_bus *b)
1044{
1045 if (b->legacy_io) {
1046 device_remove_bin_file(&b->dev, b->legacy_io);
1047 device_remove_bin_file(&b->dev, b->legacy_mem);
1048 kfree(b->legacy_io); /* both are allocated here */
1049 }
1050}
1051#endif /* HAVE_PCI_LEGACY */
1052
1053#if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
1054/**
1055 * pci_mmap_resource - map a PCI resource into user memory space
1056 * @kobj: kobject for mapping
1057 * @attr: struct bin_attribute for the file being mapped
1058 * @vma: struct vm_area_struct passed into the mmap
1059 * @write_combine: 1 for write_combine mapping
1060 *
1061 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1062 */
1063static int pci_mmap_resource(struct kobject *kobj, const struct bin_attribute *attr,
1064 struct vm_area_struct *vma, int write_combine)
1065{
1066 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1067 int bar = (unsigned long)attr->private;
1068 enum pci_mmap_state mmap_type;
1069 struct resource *res = &pdev->resource[bar];
1070 int ret;
1071
1072 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1073 if (ret)
1074 return ret;
1075
1076 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1077 return -EINVAL;
1078
1079 if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1080 return -EINVAL;
1081
1082 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1083
1084 return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1085}
1086
1087static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1088 const struct bin_attribute *attr,
1089 struct vm_area_struct *vma)
1090{
1091 return pci_mmap_resource(kobj, attr, vma, 0);
1092}
1093
1094static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1095 const struct bin_attribute *attr,
1096 struct vm_area_struct *vma)
1097{
1098 return pci_mmap_resource(kobj, attr, vma, 1);
1099}
1100
1101static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1102 struct bin_attribute *attr, char *buf,
1103 loff_t off, size_t count, bool write)
1104{
1105#ifdef CONFIG_HAS_IOPORT
1106 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1107 int bar = (unsigned long)attr->private;
1108 unsigned long port = off;
1109
1110 port += pci_resource_start(pdev, bar);
1111
1112 if (port > pci_resource_end(pdev, bar))
1113 return 0;
1114
1115 if (port + count - 1 > pci_resource_end(pdev, bar))
1116 return -EINVAL;
1117
1118 switch (count) {
1119 case 1:
1120 if (write)
1121 outb(*(u8 *)buf, port);
1122 else
1123 *(u8 *)buf = inb(port);
1124 return 1;
1125 case 2:
1126 if (write)
1127 outw(*(u16 *)buf, port);
1128 else
1129 *(u16 *)buf = inw(port);
1130 return 2;
1131 case 4:
1132 if (write)
1133 outl(*(u32 *)buf, port);
1134 else
1135 *(u32 *)buf = inl(port);
1136 return 4;
1137 }
1138 return -EINVAL;
1139#else
1140 return -ENXIO;
1141#endif
1142}
1143
1144static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1145 struct bin_attribute *attr, char *buf,
1146 loff_t off, size_t count)
1147{
1148 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1149}
1150
1151static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1152 struct bin_attribute *attr, char *buf,
1153 loff_t off, size_t count)
1154{
1155 int ret;
1156
1157 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1158 if (ret)
1159 return ret;
1160
1161 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1162}
1163
1164/**
1165 * pci_remove_resource_files - cleanup resource files
1166 * @pdev: dev to cleanup
1167 *
1168 * If we created resource files for @pdev, remove them from sysfs and
1169 * free their resources.
1170 */
1171static void pci_remove_resource_files(struct pci_dev *pdev)
1172{
1173 int i;
1174
1175 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1176 struct bin_attribute *res_attr;
1177
1178 res_attr = pdev->res_attr[i];
1179 if (res_attr) {
1180 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1181 kfree(res_attr);
1182 }
1183
1184 res_attr = pdev->res_attr_wc[i];
1185 if (res_attr) {
1186 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1187 kfree(res_attr);
1188 }
1189 }
1190}
1191
1192static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1193{
1194 /* allocate attribute structure, piggyback attribute name */
1195 int name_len = write_combine ? 13 : 10;
1196 struct bin_attribute *res_attr;
1197 char *res_attr_name;
1198 int retval;
1199
1200 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1201 if (!res_attr)
1202 return -ENOMEM;
1203
1204 res_attr_name = (char *)(res_attr + 1);
1205
1206 sysfs_bin_attr_init(res_attr);
1207 if (write_combine) {
1208 sprintf(res_attr_name, "resource%d_wc", num);
1209 res_attr->mmap = pci_mmap_resource_wc;
1210 } else {
1211 sprintf(res_attr_name, "resource%d", num);
1212 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1213 res_attr->read = pci_read_resource_io;
1214 res_attr->write = pci_write_resource_io;
1215 if (arch_can_pci_mmap_io())
1216 res_attr->mmap = pci_mmap_resource_uc;
1217 } else {
1218 res_attr->mmap = pci_mmap_resource_uc;
1219 }
1220 }
1221 if (res_attr->mmap) {
1222 res_attr->f_mapping = iomem_get_mapping;
1223 /*
1224 * generic_file_llseek() consults f_mapping->host to determine
1225 * the file size. As iomem_inode knows nothing about the
1226 * attribute, it's not going to work, so override it as well.
1227 */
1228 res_attr->llseek = pci_llseek_resource;
1229 }
1230 res_attr->attr.name = res_attr_name;
1231 res_attr->attr.mode = 0600;
1232 res_attr->size = pci_resource_len(pdev, num);
1233 res_attr->private = (void *)(unsigned long)num;
1234 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1235 if (retval) {
1236 kfree(res_attr);
1237 return retval;
1238 }
1239
1240 if (write_combine)
1241 pdev->res_attr_wc[num] = res_attr;
1242 else
1243 pdev->res_attr[num] = res_attr;
1244
1245 return 0;
1246}
1247
1248/**
1249 * pci_create_resource_files - create resource files in sysfs for @dev
1250 * @pdev: dev in question
1251 *
1252 * Walk the resources in @pdev creating files for each resource available.
1253 */
1254static int pci_create_resource_files(struct pci_dev *pdev)
1255{
1256 int i;
1257 int retval;
1258
1259 /* Expose the PCI resources from this device as files */
1260 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1261
1262 /* skip empty resources */
1263 if (!pci_resource_len(pdev, i))
1264 continue;
1265
1266 retval = pci_create_attr(pdev, i, 0);
1267 /* for prefetchable resources, create a WC mappable file */
1268 if (!retval && arch_can_pci_mmap_wc() &&
1269 pdev->resource[i].flags & IORESOURCE_PREFETCH)
1270 retval = pci_create_attr(pdev, i, 1);
1271 if (retval) {
1272 pci_remove_resource_files(pdev);
1273 return retval;
1274 }
1275 }
1276 return 0;
1277}
1278#else /* !(defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)) */
1279int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1280void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1281#endif
1282
1283/**
1284 * pci_write_rom - used to enable access to the PCI ROM display
1285 * @filp: sysfs file
1286 * @kobj: kernel object handle
1287 * @bin_attr: struct bin_attribute for this file
1288 * @buf: user input
1289 * @off: file offset
1290 * @count: number of byte in input
1291 *
1292 * writing anything except 0 enables it
1293 */
1294static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1295 struct bin_attribute *bin_attr, char *buf,
1296 loff_t off, size_t count)
1297{
1298 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1299
1300 if ((off == 0) && (*buf == '0') && (count == 2))
1301 pdev->rom_attr_enabled = 0;
1302 else
1303 pdev->rom_attr_enabled = 1;
1304
1305 return count;
1306}
1307
1308/**
1309 * pci_read_rom - read a PCI ROM
1310 * @filp: sysfs file
1311 * @kobj: kernel object handle
1312 * @bin_attr: struct bin_attribute for this file
1313 * @buf: where to put the data we read from the ROM
1314 * @off: file offset
1315 * @count: number of bytes to read
1316 *
1317 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1318 * device corresponding to @kobj.
1319 */
1320static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1321 struct bin_attribute *bin_attr, char *buf,
1322 loff_t off, size_t count)
1323{
1324 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1325 void __iomem *rom;
1326 size_t size;
1327
1328 if (!pdev->rom_attr_enabled)
1329 return -EINVAL;
1330
1331 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1332 if (!rom || !size)
1333 return -EIO;
1334
1335 if (off >= size)
1336 count = 0;
1337 else {
1338 if (off + count > size)
1339 count = size - off;
1340
1341 memcpy_fromio(buf, rom + off, count);
1342 }
1343 pci_unmap_rom(pdev, rom);
1344
1345 return count;
1346}
1347static BIN_ATTR(rom, 0600, pci_read_rom, pci_write_rom, 0);
1348
1349static struct bin_attribute *pci_dev_rom_attrs[] = {
1350 &bin_attr_rom,
1351 NULL,
1352};
1353
1354static umode_t pci_dev_rom_attr_is_visible(struct kobject *kobj,
1355 const struct bin_attribute *a, int n)
1356{
1357 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1358
1359 /* If the device has a ROM, try to expose it in sysfs. */
1360 if (!pci_resource_end(pdev, PCI_ROM_RESOURCE))
1361 return 0;
1362
1363 return a->attr.mode;
1364}
1365
1366static size_t pci_dev_rom_attr_bin_size(struct kobject *kobj,
1367 const struct bin_attribute *a, int n)
1368{
1369 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1370
1371 return pci_resource_len(pdev, PCI_ROM_RESOURCE);
1372}
1373
1374static const struct attribute_group pci_dev_rom_attr_group = {
1375 .bin_attrs = pci_dev_rom_attrs,
1376 .is_bin_visible = pci_dev_rom_attr_is_visible,
1377 .bin_size = pci_dev_rom_attr_bin_size,
1378};
1379
1380static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1381 const char *buf, size_t count)
1382{
1383 struct pci_dev *pdev = to_pci_dev(dev);
1384 unsigned long val;
1385 ssize_t result;
1386
1387 if (kstrtoul(buf, 0, &val) < 0)
1388 return -EINVAL;
1389
1390 if (val != 1)
1391 return -EINVAL;
1392
1393 pm_runtime_get_sync(dev);
1394 result = pci_reset_function(pdev);
1395 pm_runtime_put(dev);
1396 if (result < 0)
1397 return result;
1398
1399 return count;
1400}
1401static DEVICE_ATTR_WO(reset);
1402
1403static struct attribute *pci_dev_reset_attrs[] = {
1404 &dev_attr_reset.attr,
1405 NULL,
1406};
1407
1408static umode_t pci_dev_reset_attr_is_visible(struct kobject *kobj,
1409 struct attribute *a, int n)
1410{
1411 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1412
1413 if (!pci_reset_supported(pdev))
1414 return 0;
1415
1416 return a->mode;
1417}
1418
1419static const struct attribute_group pci_dev_reset_attr_group = {
1420 .attrs = pci_dev_reset_attrs,
1421 .is_visible = pci_dev_reset_attr_is_visible,
1422};
1423
1424static ssize_t __resource_resize_show(struct device *dev, int n, char *buf)
1425{
1426 struct pci_dev *pdev = to_pci_dev(dev);
1427 ssize_t ret;
1428
1429 pci_config_pm_runtime_get(pdev);
1430
1431 ret = sysfs_emit(buf, "%016llx\n",
1432 (u64)pci_rebar_get_possible_sizes(pdev, n));
1433
1434 pci_config_pm_runtime_put(pdev);
1435
1436 return ret;
1437}
1438
1439static ssize_t __resource_resize_store(struct device *dev, int n,
1440 const char *buf, size_t count)
1441{
1442 struct pci_dev *pdev = to_pci_dev(dev);
1443 unsigned long size, flags;
1444 int ret, i;
1445 u16 cmd;
1446
1447 if (kstrtoul(buf, 0, &size) < 0)
1448 return -EINVAL;
1449
1450 device_lock(dev);
1451 if (dev->driver) {
1452 ret = -EBUSY;
1453 goto unlock;
1454 }
1455
1456 pci_config_pm_runtime_get(pdev);
1457
1458 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1459 ret = aperture_remove_conflicting_pci_devices(pdev,
1460 "resourceN_resize");
1461 if (ret)
1462 goto pm_put;
1463 }
1464
1465 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
1466 pci_write_config_word(pdev, PCI_COMMAND,
1467 cmd & ~PCI_COMMAND_MEMORY);
1468
1469 flags = pci_resource_flags(pdev, n);
1470
1471 pci_remove_resource_files(pdev);
1472
1473 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1474 if (pci_resource_len(pdev, i) &&
1475 pci_resource_flags(pdev, i) == flags)
1476 pci_release_resource(pdev, i);
1477 }
1478
1479 ret = pci_resize_resource(pdev, n, size);
1480
1481 pci_assign_unassigned_bus_resources(pdev->bus);
1482
1483 if (pci_create_resource_files(pdev))
1484 pci_warn(pdev, "Failed to recreate resource files after BAR resizing\n");
1485
1486 pci_write_config_word(pdev, PCI_COMMAND, cmd);
1487pm_put:
1488 pci_config_pm_runtime_put(pdev);
1489unlock:
1490 device_unlock(dev);
1491
1492 return ret ? ret : count;
1493}
1494
1495#define pci_dev_resource_resize_attr(n) \
1496static ssize_t resource##n##_resize_show(struct device *dev, \
1497 struct device_attribute *attr, \
1498 char *buf) \
1499{ \
1500 return __resource_resize_show(dev, n, buf); \
1501} \
1502static ssize_t resource##n##_resize_store(struct device *dev, \
1503 struct device_attribute *attr,\
1504 const char *buf, size_t count)\
1505{ \
1506 return __resource_resize_store(dev, n, buf, count); \
1507} \
1508static DEVICE_ATTR_RW(resource##n##_resize)
1509
1510pci_dev_resource_resize_attr(0);
1511pci_dev_resource_resize_attr(1);
1512pci_dev_resource_resize_attr(2);
1513pci_dev_resource_resize_attr(3);
1514pci_dev_resource_resize_attr(4);
1515pci_dev_resource_resize_attr(5);
1516
1517static struct attribute *resource_resize_attrs[] = {
1518 &dev_attr_resource0_resize.attr,
1519 &dev_attr_resource1_resize.attr,
1520 &dev_attr_resource2_resize.attr,
1521 &dev_attr_resource3_resize.attr,
1522 &dev_attr_resource4_resize.attr,
1523 &dev_attr_resource5_resize.attr,
1524 NULL,
1525};
1526
1527static umode_t resource_resize_is_visible(struct kobject *kobj,
1528 struct attribute *a, int n)
1529{
1530 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1531
1532 return pci_rebar_get_current_size(pdev, n) < 0 ? 0 : a->mode;
1533}
1534
1535static const struct attribute_group pci_dev_resource_resize_group = {
1536 .attrs = resource_resize_attrs,
1537 .is_visible = resource_resize_is_visible,
1538};
1539
1540int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1541{
1542 if (!sysfs_initialized)
1543 return -EACCES;
1544
1545 return pci_create_resource_files(pdev);
1546}
1547
1548/**
1549 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1550 * @pdev: device whose entries we should free
1551 *
1552 * Cleanup when @pdev is removed from sysfs.
1553 */
1554void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1555{
1556 if (!sysfs_initialized)
1557 return;
1558
1559 pci_remove_resource_files(pdev);
1560}
1561
1562static int __init pci_sysfs_init(void)
1563{
1564 struct pci_dev *pdev = NULL;
1565 struct pci_bus *pbus = NULL;
1566 int retval;
1567
1568 sysfs_initialized = 1;
1569 for_each_pci_dev(pdev) {
1570 retval = pci_create_sysfs_dev_files(pdev);
1571 if (retval) {
1572 pci_dev_put(pdev);
1573 return retval;
1574 }
1575 }
1576
1577 while ((pbus = pci_find_next_bus(pbus)))
1578 pci_create_legacy_files(pbus);
1579
1580 return 0;
1581}
1582late_initcall(pci_sysfs_init);
1583
1584static struct attribute *pci_dev_dev_attrs[] = {
1585 &dev_attr_boot_vga.attr,
1586 NULL,
1587};
1588
1589static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1590 struct attribute *a, int n)
1591{
1592 struct device *dev = kobj_to_dev(kobj);
1593 struct pci_dev *pdev = to_pci_dev(dev);
1594
1595 if (a == &dev_attr_boot_vga.attr && pci_is_vga(pdev))
1596 return a->mode;
1597
1598 return 0;
1599}
1600
1601static struct attribute *pci_dev_hp_attrs[] = {
1602 &dev_attr_remove.attr,
1603 &dev_attr_dev_rescan.attr,
1604 NULL,
1605};
1606
1607static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1608 struct attribute *a, int n)
1609{
1610 struct device *dev = kobj_to_dev(kobj);
1611 struct pci_dev *pdev = to_pci_dev(dev);
1612
1613 if (pdev->is_virtfn)
1614 return 0;
1615
1616 return a->mode;
1617}
1618
1619static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1620 struct attribute *a, int n)
1621{
1622 struct device *dev = kobj_to_dev(kobj);
1623 struct pci_dev *pdev = to_pci_dev(dev);
1624
1625 if (pci_is_bridge(pdev))
1626 return a->mode;
1627
1628 return 0;
1629}
1630
1631static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1632 struct attribute *a, int n)
1633{
1634 struct device *dev = kobj_to_dev(kobj);
1635 struct pci_dev *pdev = to_pci_dev(dev);
1636
1637 if (pci_is_pcie(pdev))
1638 return a->mode;
1639
1640 return 0;
1641}
1642
1643static const struct attribute_group pci_dev_group = {
1644 .attrs = pci_dev_attrs,
1645};
1646
1647const struct attribute_group *pci_dev_groups[] = {
1648 &pci_dev_group,
1649 &pci_dev_config_attr_group,
1650 &pci_dev_rom_attr_group,
1651 &pci_dev_reset_attr_group,
1652 &pci_dev_reset_method_attr_group,
1653 &pci_dev_vpd_attr_group,
1654#ifdef CONFIG_DMI
1655 &pci_dev_smbios_attr_group,
1656#endif
1657#ifdef CONFIG_ACPI
1658 &pci_dev_acpi_attr_group,
1659#endif
1660 &pci_dev_resource_resize_group,
1661 ARCH_PCI_DEV_GROUPS
1662 NULL,
1663};
1664
1665static const struct attribute_group pci_dev_hp_attr_group = {
1666 .attrs = pci_dev_hp_attrs,
1667 .is_visible = pci_dev_hp_attrs_are_visible,
1668};
1669
1670static const struct attribute_group pci_dev_attr_group = {
1671 .attrs = pci_dev_dev_attrs,
1672 .is_visible = pci_dev_attrs_are_visible,
1673};
1674
1675static const struct attribute_group pci_bridge_attr_group = {
1676 .attrs = pci_bridge_attrs,
1677 .is_visible = pci_bridge_attrs_are_visible,
1678};
1679
1680static const struct attribute_group pcie_dev_attr_group = {
1681 .attrs = pcie_dev_attrs,
1682 .is_visible = pcie_dev_attrs_are_visible,
1683};
1684
1685const struct attribute_group *pci_dev_attr_groups[] = {
1686 &pci_dev_attr_group,
1687 &pci_dev_hp_attr_group,
1688#ifdef CONFIG_PCI_IOV
1689 &sriov_pf_dev_attr_group,
1690 &sriov_vf_dev_attr_group,
1691#endif
1692 &pci_bridge_attr_group,
1693 &pcie_dev_attr_group,
1694#ifdef CONFIG_PCIEAER
1695 &aer_stats_attr_group,
1696#endif
1697#ifdef CONFIG_PCIEASPM
1698 &aspm_ctrl_attr_group,
1699#endif
1700 NULL,
1701};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
4 * (C) Copyright 2002-2004 IBM Corp.
5 * (C) Copyright 2003 Matthew Wilcox
6 * (C) Copyright 2003 Hewlett-Packard
7 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
8 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
9 *
10 * File attributes for PCI devices
11 *
12 * Modeled after usb's driverfs.c
13 */
14
15
16#include <linux/kernel.h>
17#include <linux/sched.h>
18#include <linux/pci.h>
19#include <linux/stat.h>
20#include <linux/export.h>
21#include <linux/topology.h>
22#include <linux/mm.h>
23#include <linux/fs.h>
24#include <linux/capability.h>
25#include <linux/security.h>
26#include <linux/slab.h>
27#include <linux/vgaarb.h>
28#include <linux/pm_runtime.h>
29#include <linux/of.h>
30#include "pci.h"
31
32static int sysfs_initialized; /* = 0 */
33
34/* show configuration fields */
35#define pci_config_attr(field, format_string) \
36static ssize_t \
37field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
38{ \
39 struct pci_dev *pdev; \
40 \
41 pdev = to_pci_dev(dev); \
42 return sysfs_emit(buf, format_string, pdev->field); \
43} \
44static DEVICE_ATTR_RO(field)
45
46pci_config_attr(vendor, "0x%04x\n");
47pci_config_attr(device, "0x%04x\n");
48pci_config_attr(subsystem_vendor, "0x%04x\n");
49pci_config_attr(subsystem_device, "0x%04x\n");
50pci_config_attr(revision, "0x%02x\n");
51pci_config_attr(class, "0x%06x\n");
52pci_config_attr(irq, "%u\n");
53
54static ssize_t broken_parity_status_show(struct device *dev,
55 struct device_attribute *attr,
56 char *buf)
57{
58 struct pci_dev *pdev = to_pci_dev(dev);
59 return sysfs_emit(buf, "%u\n", pdev->broken_parity_status);
60}
61
62static ssize_t broken_parity_status_store(struct device *dev,
63 struct device_attribute *attr,
64 const char *buf, size_t count)
65{
66 struct pci_dev *pdev = to_pci_dev(dev);
67 unsigned long val;
68
69 if (kstrtoul(buf, 0, &val) < 0)
70 return -EINVAL;
71
72 pdev->broken_parity_status = !!val;
73
74 return count;
75}
76static DEVICE_ATTR_RW(broken_parity_status);
77
78static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
79 struct device_attribute *attr, char *buf)
80{
81 const struct cpumask *mask;
82
83#ifdef CONFIG_NUMA
84 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
85 cpumask_of_node(dev_to_node(dev));
86#else
87 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
88#endif
89 return cpumap_print_to_pagebuf(list, buf, mask);
90}
91
92static ssize_t local_cpus_show(struct device *dev,
93 struct device_attribute *attr, char *buf)
94{
95 return pci_dev_show_local_cpu(dev, false, attr, buf);
96}
97static DEVICE_ATTR_RO(local_cpus);
98
99static ssize_t local_cpulist_show(struct device *dev,
100 struct device_attribute *attr, char *buf)
101{
102 return pci_dev_show_local_cpu(dev, true, attr, buf);
103}
104static DEVICE_ATTR_RO(local_cpulist);
105
106/*
107 * PCI Bus Class Devices
108 */
109static ssize_t cpuaffinity_show(struct device *dev,
110 struct device_attribute *attr, char *buf)
111{
112 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
113
114 return cpumap_print_to_pagebuf(false, buf, cpumask);
115}
116static DEVICE_ATTR_RO(cpuaffinity);
117
118static ssize_t cpulistaffinity_show(struct device *dev,
119 struct device_attribute *attr, char *buf)
120{
121 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
122
123 return cpumap_print_to_pagebuf(true, buf, cpumask);
124}
125static DEVICE_ATTR_RO(cpulistaffinity);
126
127static ssize_t power_state_show(struct device *dev,
128 struct device_attribute *attr, char *buf)
129{
130 struct pci_dev *pdev = to_pci_dev(dev);
131
132 return sysfs_emit(buf, "%s\n", pci_power_name(pdev->current_state));
133}
134static DEVICE_ATTR_RO(power_state);
135
136/* show resources */
137static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
138 char *buf)
139{
140 struct pci_dev *pci_dev = to_pci_dev(dev);
141 int i;
142 int max;
143 resource_size_t start, end;
144 size_t len = 0;
145
146 if (pci_dev->subordinate)
147 max = DEVICE_COUNT_RESOURCE;
148 else
149 max = PCI_BRIDGE_RESOURCES;
150
151 for (i = 0; i < max; i++) {
152 struct resource *res = &pci_dev->resource[i];
153 pci_resource_to_user(pci_dev, i, res, &start, &end);
154 len += sysfs_emit_at(buf, len, "0x%016llx 0x%016llx 0x%016llx\n",
155 (unsigned long long)start,
156 (unsigned long long)end,
157 (unsigned long long)res->flags);
158 }
159 return len;
160}
161static DEVICE_ATTR_RO(resource);
162
163static ssize_t max_link_speed_show(struct device *dev,
164 struct device_attribute *attr, char *buf)
165{
166 struct pci_dev *pdev = to_pci_dev(dev);
167
168 return sysfs_emit(buf, "%s\n",
169 pci_speed_string(pcie_get_speed_cap(pdev)));
170}
171static DEVICE_ATTR_RO(max_link_speed);
172
173static ssize_t max_link_width_show(struct device *dev,
174 struct device_attribute *attr, char *buf)
175{
176 struct pci_dev *pdev = to_pci_dev(dev);
177
178 return sysfs_emit(buf, "%u\n", pcie_get_width_cap(pdev));
179}
180static DEVICE_ATTR_RO(max_link_width);
181
182static ssize_t current_link_speed_show(struct device *dev,
183 struct device_attribute *attr, char *buf)
184{
185 struct pci_dev *pci_dev = to_pci_dev(dev);
186 u16 linkstat;
187 int err;
188 enum pci_bus_speed speed;
189
190 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
191 if (err)
192 return -EINVAL;
193
194 speed = pcie_link_speed[linkstat & PCI_EXP_LNKSTA_CLS];
195
196 return sysfs_emit(buf, "%s\n", pci_speed_string(speed));
197}
198static DEVICE_ATTR_RO(current_link_speed);
199
200static ssize_t current_link_width_show(struct device *dev,
201 struct device_attribute *attr, char *buf)
202{
203 struct pci_dev *pci_dev = to_pci_dev(dev);
204 u16 linkstat;
205 int err;
206
207 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
208 if (err)
209 return -EINVAL;
210
211 return sysfs_emit(buf, "%u\n",
212 (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
213}
214static DEVICE_ATTR_RO(current_link_width);
215
216static ssize_t secondary_bus_number_show(struct device *dev,
217 struct device_attribute *attr,
218 char *buf)
219{
220 struct pci_dev *pci_dev = to_pci_dev(dev);
221 u8 sec_bus;
222 int err;
223
224 err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
225 if (err)
226 return -EINVAL;
227
228 return sysfs_emit(buf, "%u\n", sec_bus);
229}
230static DEVICE_ATTR_RO(secondary_bus_number);
231
232static ssize_t subordinate_bus_number_show(struct device *dev,
233 struct device_attribute *attr,
234 char *buf)
235{
236 struct pci_dev *pci_dev = to_pci_dev(dev);
237 u8 sub_bus;
238 int err;
239
240 err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
241 if (err)
242 return -EINVAL;
243
244 return sysfs_emit(buf, "%u\n", sub_bus);
245}
246static DEVICE_ATTR_RO(subordinate_bus_number);
247
248static ssize_t ari_enabled_show(struct device *dev,
249 struct device_attribute *attr,
250 char *buf)
251{
252 struct pci_dev *pci_dev = to_pci_dev(dev);
253
254 return sysfs_emit(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
255}
256static DEVICE_ATTR_RO(ari_enabled);
257
258static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
259 char *buf)
260{
261 struct pci_dev *pci_dev = to_pci_dev(dev);
262
263 return sysfs_emit(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
264 pci_dev->vendor, pci_dev->device,
265 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
266 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
267 (u8)(pci_dev->class));
268}
269static DEVICE_ATTR_RO(modalias);
270
271static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
272 const char *buf, size_t count)
273{
274 struct pci_dev *pdev = to_pci_dev(dev);
275 unsigned long val;
276 ssize_t result = kstrtoul(buf, 0, &val);
277
278 if (result < 0)
279 return result;
280
281 /* this can crash the machine when done on the "wrong" device */
282 if (!capable(CAP_SYS_ADMIN))
283 return -EPERM;
284
285 device_lock(dev);
286 if (dev->driver)
287 result = -EBUSY;
288 else if (val)
289 result = pci_enable_device(pdev);
290 else if (pci_is_enabled(pdev))
291 pci_disable_device(pdev);
292 else
293 result = -EIO;
294 device_unlock(dev);
295
296 return result < 0 ? result : count;
297}
298
299static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
300 char *buf)
301{
302 struct pci_dev *pdev;
303
304 pdev = to_pci_dev(dev);
305 return sysfs_emit(buf, "%u\n", atomic_read(&pdev->enable_cnt));
306}
307static DEVICE_ATTR_RW(enable);
308
309#ifdef CONFIG_NUMA
310static ssize_t numa_node_store(struct device *dev,
311 struct device_attribute *attr, const char *buf,
312 size_t count)
313{
314 struct pci_dev *pdev = to_pci_dev(dev);
315 int node, ret;
316
317 if (!capable(CAP_SYS_ADMIN))
318 return -EPERM;
319
320 ret = kstrtoint(buf, 0, &node);
321 if (ret)
322 return ret;
323
324 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
325 return -EINVAL;
326
327 if (node != NUMA_NO_NODE && !node_online(node))
328 return -EINVAL;
329
330 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
331 pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
332 node);
333
334 dev->numa_node = node;
335 return count;
336}
337
338static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
339 char *buf)
340{
341 return sysfs_emit(buf, "%d\n", dev->numa_node);
342}
343static DEVICE_ATTR_RW(numa_node);
344#endif
345
346static ssize_t dma_mask_bits_show(struct device *dev,
347 struct device_attribute *attr, char *buf)
348{
349 struct pci_dev *pdev = to_pci_dev(dev);
350
351 return sysfs_emit(buf, "%d\n", fls64(pdev->dma_mask));
352}
353static DEVICE_ATTR_RO(dma_mask_bits);
354
355static ssize_t consistent_dma_mask_bits_show(struct device *dev,
356 struct device_attribute *attr,
357 char *buf)
358{
359 return sysfs_emit(buf, "%d\n", fls64(dev->coherent_dma_mask));
360}
361static DEVICE_ATTR_RO(consistent_dma_mask_bits);
362
363static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
364 char *buf)
365{
366 struct pci_dev *pdev = to_pci_dev(dev);
367 struct pci_bus *subordinate = pdev->subordinate;
368
369 return sysfs_emit(buf, "%u\n", subordinate ?
370 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
371 : !pdev->no_msi);
372}
373
374static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
375 const char *buf, size_t count)
376{
377 struct pci_dev *pdev = to_pci_dev(dev);
378 struct pci_bus *subordinate = pdev->subordinate;
379 unsigned long val;
380
381 if (kstrtoul(buf, 0, &val) < 0)
382 return -EINVAL;
383
384 if (!capable(CAP_SYS_ADMIN))
385 return -EPERM;
386
387 /*
388 * "no_msi" and "bus_flags" only affect what happens when a driver
389 * requests MSI or MSI-X. They don't affect any drivers that have
390 * already requested MSI or MSI-X.
391 */
392 if (!subordinate) {
393 pdev->no_msi = !val;
394 pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
395 val ? "allowed" : "disallowed");
396 return count;
397 }
398
399 if (val)
400 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
401 else
402 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
403
404 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
405 val ? "allowed" : "disallowed");
406 return count;
407}
408static DEVICE_ATTR_RW(msi_bus);
409
410static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count)
411{
412 unsigned long val;
413 struct pci_bus *b = NULL;
414
415 if (kstrtoul(buf, 0, &val) < 0)
416 return -EINVAL;
417
418 if (val) {
419 pci_lock_rescan_remove();
420 while ((b = pci_find_next_bus(b)) != NULL)
421 pci_rescan_bus(b);
422 pci_unlock_rescan_remove();
423 }
424 return count;
425}
426static BUS_ATTR_WO(rescan);
427
428static struct attribute *pci_bus_attrs[] = {
429 &bus_attr_rescan.attr,
430 NULL,
431};
432
433static const struct attribute_group pci_bus_group = {
434 .attrs = pci_bus_attrs,
435};
436
437const struct attribute_group *pci_bus_groups[] = {
438 &pci_bus_group,
439 NULL,
440};
441
442static ssize_t dev_rescan_store(struct device *dev,
443 struct device_attribute *attr, const char *buf,
444 size_t count)
445{
446 unsigned long val;
447 struct pci_dev *pdev = to_pci_dev(dev);
448
449 if (kstrtoul(buf, 0, &val) < 0)
450 return -EINVAL;
451
452 if (val) {
453 pci_lock_rescan_remove();
454 pci_rescan_bus(pdev->bus);
455 pci_unlock_rescan_remove();
456 }
457 return count;
458}
459static struct device_attribute dev_attr_dev_rescan = __ATTR(rescan, 0200, NULL,
460 dev_rescan_store);
461
462static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
463 const char *buf, size_t count)
464{
465 unsigned long val;
466
467 if (kstrtoul(buf, 0, &val) < 0)
468 return -EINVAL;
469
470 if (val && device_remove_file_self(dev, attr))
471 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
472 return count;
473}
474static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0220, NULL,
475 remove_store);
476
477static ssize_t bus_rescan_store(struct device *dev,
478 struct device_attribute *attr,
479 const char *buf, size_t count)
480{
481 unsigned long val;
482 struct pci_bus *bus = to_pci_bus(dev);
483
484 if (kstrtoul(buf, 0, &val) < 0)
485 return -EINVAL;
486
487 if (val) {
488 pci_lock_rescan_remove();
489 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
490 pci_rescan_bus_bridge_resize(bus->self);
491 else
492 pci_rescan_bus(bus);
493 pci_unlock_rescan_remove();
494 }
495 return count;
496}
497static struct device_attribute dev_attr_bus_rescan = __ATTR(rescan, 0200, NULL,
498 bus_rescan_store);
499
500#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
501static ssize_t d3cold_allowed_store(struct device *dev,
502 struct device_attribute *attr,
503 const char *buf, size_t count)
504{
505 struct pci_dev *pdev = to_pci_dev(dev);
506 unsigned long val;
507
508 if (kstrtoul(buf, 0, &val) < 0)
509 return -EINVAL;
510
511 pdev->d3cold_allowed = !!val;
512 if (pdev->d3cold_allowed)
513 pci_d3cold_enable(pdev);
514 else
515 pci_d3cold_disable(pdev);
516
517 pm_runtime_resume(dev);
518
519 return count;
520}
521
522static ssize_t d3cold_allowed_show(struct device *dev,
523 struct device_attribute *attr, char *buf)
524{
525 struct pci_dev *pdev = to_pci_dev(dev);
526 return sysfs_emit(buf, "%u\n", pdev->d3cold_allowed);
527}
528static DEVICE_ATTR_RW(d3cold_allowed);
529#endif
530
531#ifdef CONFIG_OF
532static ssize_t devspec_show(struct device *dev,
533 struct device_attribute *attr, char *buf)
534{
535 struct pci_dev *pdev = to_pci_dev(dev);
536 struct device_node *np = pci_device_to_OF_node(pdev);
537
538 if (np == NULL)
539 return 0;
540 return sysfs_emit(buf, "%pOF\n", np);
541}
542static DEVICE_ATTR_RO(devspec);
543#endif
544
545static ssize_t driver_override_store(struct device *dev,
546 struct device_attribute *attr,
547 const char *buf, size_t count)
548{
549 struct pci_dev *pdev = to_pci_dev(dev);
550 char *driver_override, *old, *cp;
551
552 /* We need to keep extra room for a newline */
553 if (count >= (PAGE_SIZE - 1))
554 return -EINVAL;
555
556 driver_override = kstrndup(buf, count, GFP_KERNEL);
557 if (!driver_override)
558 return -ENOMEM;
559
560 cp = strchr(driver_override, '\n');
561 if (cp)
562 *cp = '\0';
563
564 device_lock(dev);
565 old = pdev->driver_override;
566 if (strlen(driver_override)) {
567 pdev->driver_override = driver_override;
568 } else {
569 kfree(driver_override);
570 pdev->driver_override = NULL;
571 }
572 device_unlock(dev);
573
574 kfree(old);
575
576 return count;
577}
578
579static ssize_t driver_override_show(struct device *dev,
580 struct device_attribute *attr, char *buf)
581{
582 struct pci_dev *pdev = to_pci_dev(dev);
583 ssize_t len;
584
585 device_lock(dev);
586 len = sysfs_emit(buf, "%s\n", pdev->driver_override);
587 device_unlock(dev);
588 return len;
589}
590static DEVICE_ATTR_RW(driver_override);
591
592static struct attribute *pci_dev_attrs[] = {
593 &dev_attr_power_state.attr,
594 &dev_attr_resource.attr,
595 &dev_attr_vendor.attr,
596 &dev_attr_device.attr,
597 &dev_attr_subsystem_vendor.attr,
598 &dev_attr_subsystem_device.attr,
599 &dev_attr_revision.attr,
600 &dev_attr_class.attr,
601 &dev_attr_irq.attr,
602 &dev_attr_local_cpus.attr,
603 &dev_attr_local_cpulist.attr,
604 &dev_attr_modalias.attr,
605#ifdef CONFIG_NUMA
606 &dev_attr_numa_node.attr,
607#endif
608 &dev_attr_dma_mask_bits.attr,
609 &dev_attr_consistent_dma_mask_bits.attr,
610 &dev_attr_enable.attr,
611 &dev_attr_broken_parity_status.attr,
612 &dev_attr_msi_bus.attr,
613#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
614 &dev_attr_d3cold_allowed.attr,
615#endif
616#ifdef CONFIG_OF
617 &dev_attr_devspec.attr,
618#endif
619 &dev_attr_driver_override.attr,
620 &dev_attr_ari_enabled.attr,
621 NULL,
622};
623
624static struct attribute *pci_bridge_attrs[] = {
625 &dev_attr_subordinate_bus_number.attr,
626 &dev_attr_secondary_bus_number.attr,
627 NULL,
628};
629
630static struct attribute *pcie_dev_attrs[] = {
631 &dev_attr_current_link_speed.attr,
632 &dev_attr_current_link_width.attr,
633 &dev_attr_max_link_width.attr,
634 &dev_attr_max_link_speed.attr,
635 NULL,
636};
637
638static struct attribute *pcibus_attrs[] = {
639 &dev_attr_bus_rescan.attr,
640 &dev_attr_cpuaffinity.attr,
641 &dev_attr_cpulistaffinity.attr,
642 NULL,
643};
644
645static const struct attribute_group pcibus_group = {
646 .attrs = pcibus_attrs,
647};
648
649const struct attribute_group *pcibus_groups[] = {
650 &pcibus_group,
651 NULL,
652};
653
654static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
655 char *buf)
656{
657 struct pci_dev *pdev = to_pci_dev(dev);
658 struct pci_dev *vga_dev = vga_default_device();
659
660 if (vga_dev)
661 return sysfs_emit(buf, "%u\n", (pdev == vga_dev));
662
663 return sysfs_emit(buf, "%u\n",
664 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
665 IORESOURCE_ROM_SHADOW));
666}
667static DEVICE_ATTR_RO(boot_vga);
668
669static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
670 struct bin_attribute *bin_attr, char *buf,
671 loff_t off, size_t count)
672{
673 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
674 unsigned int size = 64;
675 loff_t init_off = off;
676 u8 *data = (u8 *) buf;
677
678 /* Several chips lock up trying to read undefined config space */
679 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
680 size = dev->cfg_size;
681 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
682 size = 128;
683
684 if (off > size)
685 return 0;
686 if (off + count > size) {
687 size -= off;
688 count = size;
689 } else {
690 size = count;
691 }
692
693 pci_config_pm_runtime_get(dev);
694
695 if ((off & 1) && size) {
696 u8 val;
697 pci_user_read_config_byte(dev, off, &val);
698 data[off - init_off] = val;
699 off++;
700 size--;
701 }
702
703 if ((off & 3) && size > 2) {
704 u16 val;
705 pci_user_read_config_word(dev, off, &val);
706 data[off - init_off] = val & 0xff;
707 data[off - init_off + 1] = (val >> 8) & 0xff;
708 off += 2;
709 size -= 2;
710 }
711
712 while (size > 3) {
713 u32 val;
714 pci_user_read_config_dword(dev, off, &val);
715 data[off - init_off] = val & 0xff;
716 data[off - init_off + 1] = (val >> 8) & 0xff;
717 data[off - init_off + 2] = (val >> 16) & 0xff;
718 data[off - init_off + 3] = (val >> 24) & 0xff;
719 off += 4;
720 size -= 4;
721 cond_resched();
722 }
723
724 if (size >= 2) {
725 u16 val;
726 pci_user_read_config_word(dev, off, &val);
727 data[off - init_off] = val & 0xff;
728 data[off - init_off + 1] = (val >> 8) & 0xff;
729 off += 2;
730 size -= 2;
731 }
732
733 if (size > 0) {
734 u8 val;
735 pci_user_read_config_byte(dev, off, &val);
736 data[off - init_off] = val;
737 off++;
738 --size;
739 }
740
741 pci_config_pm_runtime_put(dev);
742
743 return count;
744}
745
746static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
747 struct bin_attribute *bin_attr, char *buf,
748 loff_t off, size_t count)
749{
750 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
751 unsigned int size = count;
752 loff_t init_off = off;
753 u8 *data = (u8 *) buf;
754 int ret;
755
756 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
757 if (ret)
758 return ret;
759
760 if (off > dev->cfg_size)
761 return 0;
762 if (off + count > dev->cfg_size) {
763 size = dev->cfg_size - off;
764 count = size;
765 }
766
767 pci_config_pm_runtime_get(dev);
768
769 if ((off & 1) && size) {
770 pci_user_write_config_byte(dev, off, data[off - init_off]);
771 off++;
772 size--;
773 }
774
775 if ((off & 3) && size > 2) {
776 u16 val = data[off - init_off];
777 val |= (u16) data[off - init_off + 1] << 8;
778 pci_user_write_config_word(dev, off, val);
779 off += 2;
780 size -= 2;
781 }
782
783 while (size > 3) {
784 u32 val = data[off - init_off];
785 val |= (u32) data[off - init_off + 1] << 8;
786 val |= (u32) data[off - init_off + 2] << 16;
787 val |= (u32) data[off - init_off + 3] << 24;
788 pci_user_write_config_dword(dev, off, val);
789 off += 4;
790 size -= 4;
791 }
792
793 if (size >= 2) {
794 u16 val = data[off - init_off];
795 val |= (u16) data[off - init_off + 1] << 8;
796 pci_user_write_config_word(dev, off, val);
797 off += 2;
798 size -= 2;
799 }
800
801 if (size) {
802 pci_user_write_config_byte(dev, off, data[off - init_off]);
803 off++;
804 --size;
805 }
806
807 pci_config_pm_runtime_put(dev);
808
809 return count;
810}
811static BIN_ATTR(config, 0644, pci_read_config, pci_write_config, 0);
812
813static struct bin_attribute *pci_dev_config_attrs[] = {
814 &bin_attr_config,
815 NULL,
816};
817
818static umode_t pci_dev_config_attr_is_visible(struct kobject *kobj,
819 struct bin_attribute *a, int n)
820{
821 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
822
823 a->size = PCI_CFG_SPACE_SIZE;
824 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
825 a->size = PCI_CFG_SPACE_EXP_SIZE;
826
827 return a->attr.mode;
828}
829
830static const struct attribute_group pci_dev_config_attr_group = {
831 .bin_attrs = pci_dev_config_attrs,
832 .is_bin_visible = pci_dev_config_attr_is_visible,
833};
834
835#ifdef HAVE_PCI_LEGACY
836/**
837 * pci_read_legacy_io - read byte(s) from legacy I/O port space
838 * @filp: open sysfs file
839 * @kobj: kobject corresponding to file to read from
840 * @bin_attr: struct bin_attribute for this file
841 * @buf: buffer to store results
842 * @off: offset into legacy I/O port space
843 * @count: number of bytes to read
844 *
845 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
846 * callback routine (pci_legacy_read).
847 */
848static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
849 struct bin_attribute *bin_attr, char *buf,
850 loff_t off, size_t count)
851{
852 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
853
854 /* Only support 1, 2 or 4 byte accesses */
855 if (count != 1 && count != 2 && count != 4)
856 return -EINVAL;
857
858 return pci_legacy_read(bus, off, (u32 *)buf, count);
859}
860
861/**
862 * pci_write_legacy_io - write byte(s) to legacy I/O port space
863 * @filp: open sysfs file
864 * @kobj: kobject corresponding to file to read from
865 * @bin_attr: struct bin_attribute for this file
866 * @buf: buffer containing value to be written
867 * @off: offset into legacy I/O port space
868 * @count: number of bytes to write
869 *
870 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
871 * callback routine (pci_legacy_write).
872 */
873static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
874 struct bin_attribute *bin_attr, char *buf,
875 loff_t off, size_t count)
876{
877 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
878
879 /* Only support 1, 2 or 4 byte accesses */
880 if (count != 1 && count != 2 && count != 4)
881 return -EINVAL;
882
883 return pci_legacy_write(bus, off, *(u32 *)buf, count);
884}
885
886/**
887 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
888 * @filp: open sysfs file
889 * @kobj: kobject corresponding to device to be mapped
890 * @attr: struct bin_attribute for this file
891 * @vma: struct vm_area_struct passed to mmap
892 *
893 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
894 * legacy memory space (first meg of bus space) into application virtual
895 * memory space.
896 */
897static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
898 struct bin_attribute *attr,
899 struct vm_area_struct *vma)
900{
901 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
902
903 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
904}
905
906/**
907 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
908 * @filp: open sysfs file
909 * @kobj: kobject corresponding to device to be mapped
910 * @attr: struct bin_attribute for this file
911 * @vma: struct vm_area_struct passed to mmap
912 *
913 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
914 * legacy IO space (first meg of bus space) into application virtual
915 * memory space. Returns -ENOSYS if the operation isn't supported
916 */
917static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
918 struct bin_attribute *attr,
919 struct vm_area_struct *vma)
920{
921 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
922
923 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
924}
925
926/**
927 * pci_adjust_legacy_attr - adjustment of legacy file attributes
928 * @b: bus to create files under
929 * @mmap_type: I/O port or memory
930 *
931 * Stub implementation. Can be overridden by arch if necessary.
932 */
933void __weak pci_adjust_legacy_attr(struct pci_bus *b,
934 enum pci_mmap_state mmap_type)
935{
936}
937
938/**
939 * pci_create_legacy_files - create legacy I/O port and memory files
940 * @b: bus to create files under
941 *
942 * Some platforms allow access to legacy I/O port and ISA memory space on
943 * a per-bus basis. This routine creates the files and ties them into
944 * their associated read, write and mmap files from pci-sysfs.c
945 *
946 * On error unwind, but don't propagate the error to the caller
947 * as it is ok to set up the PCI bus without these files.
948 */
949void pci_create_legacy_files(struct pci_bus *b)
950{
951 int error;
952
953 if (!sysfs_initialized)
954 return;
955
956 b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
957 GFP_ATOMIC);
958 if (!b->legacy_io)
959 goto kzalloc_err;
960
961 sysfs_bin_attr_init(b->legacy_io);
962 b->legacy_io->attr.name = "legacy_io";
963 b->legacy_io->size = 0xffff;
964 b->legacy_io->attr.mode = 0600;
965 b->legacy_io->read = pci_read_legacy_io;
966 b->legacy_io->write = pci_write_legacy_io;
967 b->legacy_io->mmap = pci_mmap_legacy_io;
968 b->legacy_io->mapping = iomem_get_mapping();
969 pci_adjust_legacy_attr(b, pci_mmap_io);
970 error = device_create_bin_file(&b->dev, b->legacy_io);
971 if (error)
972 goto legacy_io_err;
973
974 /* Allocated above after the legacy_io struct */
975 b->legacy_mem = b->legacy_io + 1;
976 sysfs_bin_attr_init(b->legacy_mem);
977 b->legacy_mem->attr.name = "legacy_mem";
978 b->legacy_mem->size = 1024*1024;
979 b->legacy_mem->attr.mode = 0600;
980 b->legacy_mem->mmap = pci_mmap_legacy_mem;
981 b->legacy_mem->mapping = iomem_get_mapping();
982 pci_adjust_legacy_attr(b, pci_mmap_mem);
983 error = device_create_bin_file(&b->dev, b->legacy_mem);
984 if (error)
985 goto legacy_mem_err;
986
987 return;
988
989legacy_mem_err:
990 device_remove_bin_file(&b->dev, b->legacy_io);
991legacy_io_err:
992 kfree(b->legacy_io);
993 b->legacy_io = NULL;
994kzalloc_err:
995 dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n");
996}
997
998void pci_remove_legacy_files(struct pci_bus *b)
999{
1000 if (b->legacy_io) {
1001 device_remove_bin_file(&b->dev, b->legacy_io);
1002 device_remove_bin_file(&b->dev, b->legacy_mem);
1003 kfree(b->legacy_io); /* both are allocated here */
1004 }
1005}
1006#endif /* HAVE_PCI_LEGACY */
1007
1008#if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
1009
1010int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
1011 enum pci_mmap_api mmap_api)
1012{
1013 unsigned long nr, start, size;
1014 resource_size_t pci_start = 0, pci_end;
1015
1016 if (pci_resource_len(pdev, resno) == 0)
1017 return 0;
1018 nr = vma_pages(vma);
1019 start = vma->vm_pgoff;
1020 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
1021 if (mmap_api == PCI_MMAP_PROCFS) {
1022 pci_resource_to_user(pdev, resno, &pdev->resource[resno],
1023 &pci_start, &pci_end);
1024 pci_start >>= PAGE_SHIFT;
1025 }
1026 if (start >= pci_start && start < pci_start + size &&
1027 start + nr <= pci_start + size)
1028 return 1;
1029 return 0;
1030}
1031
1032/**
1033 * pci_mmap_resource - map a PCI resource into user memory space
1034 * @kobj: kobject for mapping
1035 * @attr: struct bin_attribute for the file being mapped
1036 * @vma: struct vm_area_struct passed into the mmap
1037 * @write_combine: 1 for write_combine mapping
1038 *
1039 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1040 */
1041static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1042 struct vm_area_struct *vma, int write_combine)
1043{
1044 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1045 int bar = (unsigned long)attr->private;
1046 enum pci_mmap_state mmap_type;
1047 struct resource *res = &pdev->resource[bar];
1048 int ret;
1049
1050 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1051 if (ret)
1052 return ret;
1053
1054 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1055 return -EINVAL;
1056
1057 if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1058 return -EINVAL;
1059
1060 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1061
1062 return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1063}
1064
1065static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1066 struct bin_attribute *attr,
1067 struct vm_area_struct *vma)
1068{
1069 return pci_mmap_resource(kobj, attr, vma, 0);
1070}
1071
1072static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1073 struct bin_attribute *attr,
1074 struct vm_area_struct *vma)
1075{
1076 return pci_mmap_resource(kobj, attr, vma, 1);
1077}
1078
1079static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1080 struct bin_attribute *attr, char *buf,
1081 loff_t off, size_t count, bool write)
1082{
1083 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1084 int bar = (unsigned long)attr->private;
1085 unsigned long port = off;
1086
1087 port += pci_resource_start(pdev, bar);
1088
1089 if (port > pci_resource_end(pdev, bar))
1090 return 0;
1091
1092 if (port + count - 1 > pci_resource_end(pdev, bar))
1093 return -EINVAL;
1094
1095 switch (count) {
1096 case 1:
1097 if (write)
1098 outb(*(u8 *)buf, port);
1099 else
1100 *(u8 *)buf = inb(port);
1101 return 1;
1102 case 2:
1103 if (write)
1104 outw(*(u16 *)buf, port);
1105 else
1106 *(u16 *)buf = inw(port);
1107 return 2;
1108 case 4:
1109 if (write)
1110 outl(*(u32 *)buf, port);
1111 else
1112 *(u32 *)buf = inl(port);
1113 return 4;
1114 }
1115 return -EINVAL;
1116}
1117
1118static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1119 struct bin_attribute *attr, char *buf,
1120 loff_t off, size_t count)
1121{
1122 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1123}
1124
1125static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1126 struct bin_attribute *attr, char *buf,
1127 loff_t off, size_t count)
1128{
1129 int ret;
1130
1131 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1132 if (ret)
1133 return ret;
1134
1135 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1136}
1137
1138/**
1139 * pci_remove_resource_files - cleanup resource files
1140 * @pdev: dev to cleanup
1141 *
1142 * If we created resource files for @pdev, remove them from sysfs and
1143 * free their resources.
1144 */
1145static void pci_remove_resource_files(struct pci_dev *pdev)
1146{
1147 int i;
1148
1149 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1150 struct bin_attribute *res_attr;
1151
1152 res_attr = pdev->res_attr[i];
1153 if (res_attr) {
1154 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1155 kfree(res_attr);
1156 }
1157
1158 res_attr = pdev->res_attr_wc[i];
1159 if (res_attr) {
1160 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1161 kfree(res_attr);
1162 }
1163 }
1164}
1165
1166static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1167{
1168 /* allocate attribute structure, piggyback attribute name */
1169 int name_len = write_combine ? 13 : 10;
1170 struct bin_attribute *res_attr;
1171 char *res_attr_name;
1172 int retval;
1173
1174 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1175 if (!res_attr)
1176 return -ENOMEM;
1177
1178 res_attr_name = (char *)(res_attr + 1);
1179
1180 sysfs_bin_attr_init(res_attr);
1181 if (write_combine) {
1182 pdev->res_attr_wc[num] = res_attr;
1183 sprintf(res_attr_name, "resource%d_wc", num);
1184 res_attr->mmap = pci_mmap_resource_wc;
1185 } else {
1186 pdev->res_attr[num] = res_attr;
1187 sprintf(res_attr_name, "resource%d", num);
1188 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1189 res_attr->read = pci_read_resource_io;
1190 res_attr->write = pci_write_resource_io;
1191 if (arch_can_pci_mmap_io())
1192 res_attr->mmap = pci_mmap_resource_uc;
1193 } else {
1194 res_attr->mmap = pci_mmap_resource_uc;
1195 }
1196 }
1197 if (res_attr->mmap)
1198 res_attr->mapping = iomem_get_mapping();
1199 res_attr->attr.name = res_attr_name;
1200 res_attr->attr.mode = 0600;
1201 res_attr->size = pci_resource_len(pdev, num);
1202 res_attr->private = (void *)(unsigned long)num;
1203 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1204 if (retval)
1205 kfree(res_attr);
1206
1207 return retval;
1208}
1209
1210/**
1211 * pci_create_resource_files - create resource files in sysfs for @dev
1212 * @pdev: dev in question
1213 *
1214 * Walk the resources in @pdev creating files for each resource available.
1215 */
1216static int pci_create_resource_files(struct pci_dev *pdev)
1217{
1218 int i;
1219 int retval;
1220
1221 /* Expose the PCI resources from this device as files */
1222 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1223
1224 /* skip empty resources */
1225 if (!pci_resource_len(pdev, i))
1226 continue;
1227
1228 retval = pci_create_attr(pdev, i, 0);
1229 /* for prefetchable resources, create a WC mappable file */
1230 if (!retval && arch_can_pci_mmap_wc() &&
1231 pdev->resource[i].flags & IORESOURCE_PREFETCH)
1232 retval = pci_create_attr(pdev, i, 1);
1233 if (retval) {
1234 pci_remove_resource_files(pdev);
1235 return retval;
1236 }
1237 }
1238 return 0;
1239}
1240#else /* !(defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)) */
1241int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1242void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1243#endif
1244
1245/**
1246 * pci_write_rom - used to enable access to the PCI ROM display
1247 * @filp: sysfs file
1248 * @kobj: kernel object handle
1249 * @bin_attr: struct bin_attribute for this file
1250 * @buf: user input
1251 * @off: file offset
1252 * @count: number of byte in input
1253 *
1254 * writing anything except 0 enables it
1255 */
1256static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1257 struct bin_attribute *bin_attr, char *buf,
1258 loff_t off, size_t count)
1259{
1260 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1261
1262 if ((off == 0) && (*buf == '0') && (count == 2))
1263 pdev->rom_attr_enabled = 0;
1264 else
1265 pdev->rom_attr_enabled = 1;
1266
1267 return count;
1268}
1269
1270/**
1271 * pci_read_rom - read a PCI ROM
1272 * @filp: sysfs file
1273 * @kobj: kernel object handle
1274 * @bin_attr: struct bin_attribute for this file
1275 * @buf: where to put the data we read from the ROM
1276 * @off: file offset
1277 * @count: number of bytes to read
1278 *
1279 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1280 * device corresponding to @kobj.
1281 */
1282static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1283 struct bin_attribute *bin_attr, char *buf,
1284 loff_t off, size_t count)
1285{
1286 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1287 void __iomem *rom;
1288 size_t size;
1289
1290 if (!pdev->rom_attr_enabled)
1291 return -EINVAL;
1292
1293 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1294 if (!rom || !size)
1295 return -EIO;
1296
1297 if (off >= size)
1298 count = 0;
1299 else {
1300 if (off + count > size)
1301 count = size - off;
1302
1303 memcpy_fromio(buf, rom + off, count);
1304 }
1305 pci_unmap_rom(pdev, rom);
1306
1307 return count;
1308}
1309static BIN_ATTR(rom, 0600, pci_read_rom, pci_write_rom, 0);
1310
1311static struct bin_attribute *pci_dev_rom_attrs[] = {
1312 &bin_attr_rom,
1313 NULL,
1314};
1315
1316static umode_t pci_dev_rom_attr_is_visible(struct kobject *kobj,
1317 struct bin_attribute *a, int n)
1318{
1319 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1320 size_t rom_size;
1321
1322 /* If the device has a ROM, try to expose it in sysfs. */
1323 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1324 if (!rom_size)
1325 return 0;
1326
1327 a->size = rom_size;
1328
1329 return a->attr.mode;
1330}
1331
1332static const struct attribute_group pci_dev_rom_attr_group = {
1333 .bin_attrs = pci_dev_rom_attrs,
1334 .is_bin_visible = pci_dev_rom_attr_is_visible,
1335};
1336
1337static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1338 const char *buf, size_t count)
1339{
1340 struct pci_dev *pdev = to_pci_dev(dev);
1341 unsigned long val;
1342 ssize_t result = kstrtoul(buf, 0, &val);
1343
1344 if (result < 0)
1345 return result;
1346
1347 if (val != 1)
1348 return -EINVAL;
1349
1350 pm_runtime_get_sync(dev);
1351 result = pci_reset_function(pdev);
1352 pm_runtime_put(dev);
1353 if (result < 0)
1354 return result;
1355
1356 return count;
1357}
1358static DEVICE_ATTR_WO(reset);
1359
1360static struct attribute *pci_dev_reset_attrs[] = {
1361 &dev_attr_reset.attr,
1362 NULL,
1363};
1364
1365static umode_t pci_dev_reset_attr_is_visible(struct kobject *kobj,
1366 struct attribute *a, int n)
1367{
1368 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1369
1370 if (!pdev->reset_fn)
1371 return 0;
1372
1373 return a->mode;
1374}
1375
1376static const struct attribute_group pci_dev_reset_attr_group = {
1377 .attrs = pci_dev_reset_attrs,
1378 .is_visible = pci_dev_reset_attr_is_visible,
1379};
1380
1381int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1382{
1383 if (!sysfs_initialized)
1384 return -EACCES;
1385
1386 return pci_create_resource_files(pdev);
1387}
1388
1389/**
1390 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1391 * @pdev: device whose entries we should free
1392 *
1393 * Cleanup when @pdev is removed from sysfs.
1394 */
1395void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1396{
1397 if (!sysfs_initialized)
1398 return;
1399
1400 pci_remove_resource_files(pdev);
1401}
1402
1403static int __init pci_sysfs_init(void)
1404{
1405 struct pci_dev *pdev = NULL;
1406 struct pci_bus *pbus = NULL;
1407 int retval;
1408
1409 sysfs_initialized = 1;
1410 for_each_pci_dev(pdev) {
1411 retval = pci_create_sysfs_dev_files(pdev);
1412 if (retval) {
1413 pci_dev_put(pdev);
1414 return retval;
1415 }
1416 }
1417
1418 while ((pbus = pci_find_next_bus(pbus)))
1419 pci_create_legacy_files(pbus);
1420
1421 return 0;
1422}
1423late_initcall(pci_sysfs_init);
1424
1425static struct attribute *pci_dev_dev_attrs[] = {
1426 &dev_attr_boot_vga.attr,
1427 NULL,
1428};
1429
1430static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1431 struct attribute *a, int n)
1432{
1433 struct device *dev = kobj_to_dev(kobj);
1434 struct pci_dev *pdev = to_pci_dev(dev);
1435
1436 if (a == &dev_attr_boot_vga.attr)
1437 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1438 return 0;
1439
1440 return a->mode;
1441}
1442
1443static struct attribute *pci_dev_hp_attrs[] = {
1444 &dev_attr_remove.attr,
1445 &dev_attr_dev_rescan.attr,
1446 NULL,
1447};
1448
1449static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1450 struct attribute *a, int n)
1451{
1452 struct device *dev = kobj_to_dev(kobj);
1453 struct pci_dev *pdev = to_pci_dev(dev);
1454
1455 if (pdev->is_virtfn)
1456 return 0;
1457
1458 return a->mode;
1459}
1460
1461static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1462 struct attribute *a, int n)
1463{
1464 struct device *dev = kobj_to_dev(kobj);
1465 struct pci_dev *pdev = to_pci_dev(dev);
1466
1467 if (pci_is_bridge(pdev))
1468 return a->mode;
1469
1470 return 0;
1471}
1472
1473static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1474 struct attribute *a, int n)
1475{
1476 struct device *dev = kobj_to_dev(kobj);
1477 struct pci_dev *pdev = to_pci_dev(dev);
1478
1479 if (pci_is_pcie(pdev))
1480 return a->mode;
1481
1482 return 0;
1483}
1484
1485static const struct attribute_group pci_dev_group = {
1486 .attrs = pci_dev_attrs,
1487};
1488
1489const struct attribute_group *pci_dev_groups[] = {
1490 &pci_dev_group,
1491 &pci_dev_config_attr_group,
1492 &pci_dev_rom_attr_group,
1493 &pci_dev_reset_attr_group,
1494 &pci_dev_vpd_attr_group,
1495#ifdef CONFIG_DMI
1496 &pci_dev_smbios_attr_group,
1497#endif
1498#ifdef CONFIG_ACPI
1499 &pci_dev_acpi_attr_group,
1500#endif
1501 NULL,
1502};
1503
1504static const struct attribute_group pci_dev_hp_attr_group = {
1505 .attrs = pci_dev_hp_attrs,
1506 .is_visible = pci_dev_hp_attrs_are_visible,
1507};
1508
1509static const struct attribute_group pci_dev_attr_group = {
1510 .attrs = pci_dev_dev_attrs,
1511 .is_visible = pci_dev_attrs_are_visible,
1512};
1513
1514static const struct attribute_group pci_bridge_attr_group = {
1515 .attrs = pci_bridge_attrs,
1516 .is_visible = pci_bridge_attrs_are_visible,
1517};
1518
1519static const struct attribute_group pcie_dev_attr_group = {
1520 .attrs = pcie_dev_attrs,
1521 .is_visible = pcie_dev_attrs_are_visible,
1522};
1523
1524static const struct attribute_group *pci_dev_attr_groups[] = {
1525 &pci_dev_attr_group,
1526 &pci_dev_hp_attr_group,
1527#ifdef CONFIG_PCI_IOV
1528 &sriov_pf_dev_attr_group,
1529 &sriov_vf_dev_attr_group,
1530#endif
1531 &pci_bridge_attr_group,
1532 &pcie_dev_attr_group,
1533#ifdef CONFIG_PCIEAER
1534 &aer_stats_attr_group,
1535#endif
1536#ifdef CONFIG_PCIEASPM
1537 &aspm_ctrl_attr_group,
1538#endif
1539 NULL,
1540};
1541
1542const struct device_type pci_dev_type = {
1543 .groups = pci_dev_attr_groups,
1544};