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