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