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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/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};