1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
4 * (C) Copyright 2002-2004 IBM Corp.
5 * (C) Copyright 2003 Matthew Wilcox
6 * (C) Copyright 2003 Hewlett-Packard
7 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
8 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
9 *
10 * File attributes for PCI devices
11 *
12 * Modeled after usb's driverfs.c
13 */
14
15
16 #include <linux/kernel.h>
17 #include <linux/sched.h>
18 #include <linux/pci.h>
19 #include <linux/stat.h>
20 #include <linux/export.h>
21 #include <linux/topology.h>
22 #include <linux/mm.h>
23 #include <linux/fs.h>
24 #include <linux/capability.h>
25 #include <linux/security.h>
26 #include <linux/slab.h>
27 #include <linux/vgaarb.h>
28 #include <linux/pm_runtime.h>
29 #include <linux/of.h>
30 #include "pci.h"
31
32 static int sysfs_initialized; /* = 0 */
33
34 /* show configuration fields */
35 #define pci_config_attr(field, format_string) \
36 static ssize_t \
37 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
38 { \
39 struct pci_dev *pdev; \
40 \
41 pdev = to_pci_dev(dev); \
42 return sprintf(buf, format_string, pdev->field); \
43 } \
44 static DEVICE_ATTR_RO(field)
45
46 pci_config_attr(vendor, "0x%04x\n");
47 pci_config_attr(device, "0x%04x\n");
48 pci_config_attr(subsystem_vendor, "0x%04x\n");
49 pci_config_attr(subsystem_device, "0x%04x\n");
50 pci_config_attr(revision, "0x%02x\n");
51 pci_config_attr(class, "0x%06x\n");
52 pci_config_attr(irq, "%u\n");
53
broken_parity_status_show(struct device * dev,struct device_attribute * attr,char * buf)54 static ssize_t broken_parity_status_show(struct device *dev,
55 struct device_attribute *attr,
56 char *buf)
57 {
58 struct pci_dev *pdev = to_pci_dev(dev);
59 return sprintf(buf, "%u\n", pdev->broken_parity_status);
60 }
61
broken_parity_status_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)62 static ssize_t broken_parity_status_store(struct device *dev,
63 struct device_attribute *attr,
64 const char *buf, size_t count)
65 {
66 struct pci_dev *pdev = to_pci_dev(dev);
67 unsigned long val;
68
69 if (kstrtoul(buf, 0, &val) < 0)
70 return -EINVAL;
71
72 pdev->broken_parity_status = !!val;
73
74 return count;
75 }
76 static DEVICE_ATTR_RW(broken_parity_status);
77
pci_dev_show_local_cpu(struct device * dev,bool list,struct device_attribute * attr,char * buf)78 static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
79 struct device_attribute *attr, char *buf)
80 {
81 const struct cpumask *mask;
82
83 #ifdef CONFIG_NUMA
84 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
85 cpumask_of_node(dev_to_node(dev));
86 #else
87 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
88 #endif
89 return cpumap_print_to_pagebuf(list, buf, mask);
90 }
91
local_cpus_show(struct device * dev,struct device_attribute * attr,char * buf)92 static ssize_t local_cpus_show(struct device *dev,
93 struct device_attribute *attr, char *buf)
94 {
95 return pci_dev_show_local_cpu(dev, false, attr, buf);
96 }
97 static DEVICE_ATTR_RO(local_cpus);
98
local_cpulist_show(struct device * dev,struct device_attribute * attr,char * buf)99 static ssize_t local_cpulist_show(struct device *dev,
100 struct device_attribute *attr, char *buf)
101 {
102 return pci_dev_show_local_cpu(dev, true, attr, buf);
103 }
104 static DEVICE_ATTR_RO(local_cpulist);
105
106 /*
107 * PCI Bus Class Devices
108 */
cpuaffinity_show(struct device * dev,struct device_attribute * attr,char * buf)109 static ssize_t cpuaffinity_show(struct device *dev,
110 struct device_attribute *attr, char *buf)
111 {
112 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
113
114 return cpumap_print_to_pagebuf(false, buf, cpumask);
115 }
116 static DEVICE_ATTR_RO(cpuaffinity);
117
cpulistaffinity_show(struct device * dev,struct device_attribute * attr,char * buf)118 static ssize_t cpulistaffinity_show(struct device *dev,
119 struct device_attribute *attr, char *buf)
120 {
121 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
122
123 return cpumap_print_to_pagebuf(true, buf, cpumask);
124 }
125 static DEVICE_ATTR_RO(cpulistaffinity);
126
127 /* show resources */
resource_show(struct device * dev,struct device_attribute * attr,char * buf)128 static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
129 char *buf)
130 {
131 struct pci_dev *pci_dev = to_pci_dev(dev);
132 char *str = buf;
133 int i;
134 int max;
135 resource_size_t start, end;
136
137 if (pci_dev->subordinate)
138 max = DEVICE_COUNT_RESOURCE;
139 else
140 max = PCI_BRIDGE_RESOURCES;
141
142 for (i = 0; i < max; i++) {
143 struct resource *res = &pci_dev->resource[i];
144 pci_resource_to_user(pci_dev, i, res, &start, &end);
145 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
146 (unsigned long long)start,
147 (unsigned long long)end,
148 (unsigned long long)res->flags);
149 }
150 return (str - buf);
151 }
152 static DEVICE_ATTR_RO(resource);
153
max_link_speed_show(struct device * dev,struct device_attribute * attr,char * buf)154 static ssize_t max_link_speed_show(struct device *dev,
155 struct device_attribute *attr, char *buf)
156 {
157 struct pci_dev *pdev = to_pci_dev(dev);
158
159 return sprintf(buf, "%s\n", PCIE_SPEED2STR(pcie_get_speed_cap(pdev)));
160 }
161 static DEVICE_ATTR_RO(max_link_speed);
162
max_link_width_show(struct device * dev,struct device_attribute * attr,char * buf)163 static ssize_t max_link_width_show(struct device *dev,
164 struct device_attribute *attr, char *buf)
165 {
166 struct pci_dev *pdev = to_pci_dev(dev);
167
168 return sprintf(buf, "%u\n", pcie_get_width_cap(pdev));
169 }
170 static DEVICE_ATTR_RO(max_link_width);
171
current_link_speed_show(struct device * dev,struct device_attribute * attr,char * buf)172 static ssize_t current_link_speed_show(struct device *dev,
173 struct device_attribute *attr, char *buf)
174 {
175 struct pci_dev *pci_dev = to_pci_dev(dev);
176 u16 linkstat;
177 int err;
178 const char *speed;
179
180 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
181 if (err)
182 return -EINVAL;
183
184 switch (linkstat & PCI_EXP_LNKSTA_CLS) {
185 case PCI_EXP_LNKSTA_CLS_32_0GB:
186 speed = "32 GT/s";
187 break;
188 case PCI_EXP_LNKSTA_CLS_16_0GB:
189 speed = "16 GT/s";
190 break;
191 case PCI_EXP_LNKSTA_CLS_8_0GB:
192 speed = "8 GT/s";
193 break;
194 case PCI_EXP_LNKSTA_CLS_5_0GB:
195 speed = "5 GT/s";
196 break;
197 case PCI_EXP_LNKSTA_CLS_2_5GB:
198 speed = "2.5 GT/s";
199 break;
200 default:
201 speed = "Unknown speed";
202 }
203
204 return sprintf(buf, "%s\n", speed);
205 }
206 static DEVICE_ATTR_RO(current_link_speed);
207
current_link_width_show(struct device * dev,struct device_attribute * attr,char * buf)208 static ssize_t current_link_width_show(struct device *dev,
209 struct device_attribute *attr, char *buf)
210 {
211 struct pci_dev *pci_dev = to_pci_dev(dev);
212 u16 linkstat;
213 int err;
214
215 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
216 if (err)
217 return -EINVAL;
218
219 return sprintf(buf, "%u\n",
220 (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
221 }
222 static DEVICE_ATTR_RO(current_link_width);
223
secondary_bus_number_show(struct device * dev,struct device_attribute * attr,char * buf)224 static ssize_t secondary_bus_number_show(struct device *dev,
225 struct device_attribute *attr,
226 char *buf)
227 {
228 struct pci_dev *pci_dev = to_pci_dev(dev);
229 u8 sec_bus;
230 int err;
231
232 err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
233 if (err)
234 return -EINVAL;
235
236 return sprintf(buf, "%u\n", sec_bus);
237 }
238 static DEVICE_ATTR_RO(secondary_bus_number);
239
subordinate_bus_number_show(struct device * dev,struct device_attribute * attr,char * buf)240 static ssize_t subordinate_bus_number_show(struct device *dev,
241 struct device_attribute *attr,
242 char *buf)
243 {
244 struct pci_dev *pci_dev = to_pci_dev(dev);
245 u8 sub_bus;
246 int err;
247
248 err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
249 if (err)
250 return -EINVAL;
251
252 return sprintf(buf, "%u\n", sub_bus);
253 }
254 static DEVICE_ATTR_RO(subordinate_bus_number);
255
ari_enabled_show(struct device * dev,struct device_attribute * attr,char * buf)256 static ssize_t ari_enabled_show(struct device *dev,
257 struct device_attribute *attr,
258 char *buf)
259 {
260 struct pci_dev *pci_dev = to_pci_dev(dev);
261
262 return sprintf(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
263 }
264 static DEVICE_ATTR_RO(ari_enabled);
265
modalias_show(struct device * dev,struct device_attribute * attr,char * buf)266 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
267 char *buf)
268 {
269 struct pci_dev *pci_dev = to_pci_dev(dev);
270
271 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
272 pci_dev->vendor, pci_dev->device,
273 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
274 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
275 (u8)(pci_dev->class));
276 }
277 static DEVICE_ATTR_RO(modalias);
278
enable_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)279 static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
280 const char *buf, size_t count)
281 {
282 struct pci_dev *pdev = to_pci_dev(dev);
283 unsigned long val;
284 ssize_t result = kstrtoul(buf, 0, &val);
285
286 if (result < 0)
287 return result;
288
289 /* this can crash the machine when done on the "wrong" device */
290 if (!capable(CAP_SYS_ADMIN))
291 return -EPERM;
292
293 device_lock(dev);
294 if (dev->driver)
295 result = -EBUSY;
296 else if (val)
297 result = pci_enable_device(pdev);
298 else if (pci_is_enabled(pdev))
299 pci_disable_device(pdev);
300 else
301 result = -EIO;
302 device_unlock(dev);
303
304 return result < 0 ? result : count;
305 }
306
enable_show(struct device * dev,struct device_attribute * attr,char * buf)307 static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
308 char *buf)
309 {
310 struct pci_dev *pdev;
311
312 pdev = to_pci_dev(dev);
313 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
314 }
315 static DEVICE_ATTR_RW(enable);
316
317 #ifdef CONFIG_NUMA
numa_node_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)318 static ssize_t numa_node_store(struct device *dev,
319 struct device_attribute *attr, const char *buf,
320 size_t count)
321 {
322 struct pci_dev *pdev = to_pci_dev(dev);
323 int node, ret;
324
325 if (!capable(CAP_SYS_ADMIN))
326 return -EPERM;
327
328 ret = kstrtoint(buf, 0, &node);
329 if (ret)
330 return ret;
331
332 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
333 return -EINVAL;
334
335 if (node != NUMA_NO_NODE && !node_online(node))
336 return -EINVAL;
337
338 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
339 pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
340 node);
341
342 dev->numa_node = node;
343 return count;
344 }
345
numa_node_show(struct device * dev,struct device_attribute * attr,char * buf)346 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
347 char *buf)
348 {
349 return sprintf(buf, "%d\n", dev->numa_node);
350 }
351 static DEVICE_ATTR_RW(numa_node);
352 #endif
353
dma_mask_bits_show(struct device * dev,struct device_attribute * attr,char * buf)354 static ssize_t dma_mask_bits_show(struct device *dev,
355 struct device_attribute *attr, char *buf)
356 {
357 struct pci_dev *pdev = to_pci_dev(dev);
358
359 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
360 }
361 static DEVICE_ATTR_RO(dma_mask_bits);
362
consistent_dma_mask_bits_show(struct device * dev,struct device_attribute * attr,char * buf)363 static ssize_t consistent_dma_mask_bits_show(struct device *dev,
364 struct device_attribute *attr,
365 char *buf)
366 {
367 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
368 }
369 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
370
msi_bus_show(struct device * dev,struct device_attribute * attr,char * buf)371 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
372 char *buf)
373 {
374 struct pci_dev *pdev = to_pci_dev(dev);
375 struct pci_bus *subordinate = pdev->subordinate;
376
377 return sprintf(buf, "%u\n", subordinate ?
378 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
379 : !pdev->no_msi);
380 }
381
msi_bus_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)382 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
383 const char *buf, size_t count)
384 {
385 struct pci_dev *pdev = to_pci_dev(dev);
386 struct pci_bus *subordinate = pdev->subordinate;
387 unsigned long val;
388
389 if (kstrtoul(buf, 0, &val) < 0)
390 return -EINVAL;
391
392 if (!capable(CAP_SYS_ADMIN))
393 return -EPERM;
394
395 /*
396 * "no_msi" and "bus_flags" only affect what happens when a driver
397 * requests MSI or MSI-X. They don't affect any drivers that have
398 * already requested MSI or MSI-X.
399 */
400 if (!subordinate) {
401 pdev->no_msi = !val;
402 pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
403 val ? "allowed" : "disallowed");
404 return count;
405 }
406
407 if (val)
408 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
409 else
410 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
411
412 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
413 val ? "allowed" : "disallowed");
414 return count;
415 }
416 static DEVICE_ATTR_RW(msi_bus);
417
rescan_store(struct bus_type * bus,const char * buf,size_t count)418 static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count)
419 {
420 unsigned long val;
421 struct pci_bus *b = NULL;
422
423 if (kstrtoul(buf, 0, &val) < 0)
424 return -EINVAL;
425
426 if (val) {
427 pci_lock_rescan_remove();
428 while ((b = pci_find_next_bus(b)) != NULL)
429 pci_rescan_bus(b);
430 pci_unlock_rescan_remove();
431 }
432 return count;
433 }
434 static BUS_ATTR_WO(rescan);
435
436 static struct attribute *pci_bus_attrs[] = {
437 &bus_attr_rescan.attr,
438 NULL,
439 };
440
441 static const struct attribute_group pci_bus_group = {
442 .attrs = pci_bus_attrs,
443 };
444
445 const struct attribute_group *pci_bus_groups[] = {
446 &pci_bus_group,
447 NULL,
448 };
449
dev_rescan_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)450 static ssize_t dev_rescan_store(struct device *dev,
451 struct device_attribute *attr, const char *buf,
452 size_t count)
453 {
454 unsigned long val;
455 struct pci_dev *pdev = to_pci_dev(dev);
456
457 if (kstrtoul(buf, 0, &val) < 0)
458 return -EINVAL;
459
460 if (val) {
461 pci_lock_rescan_remove();
462 pci_rescan_bus(pdev->bus);
463 pci_unlock_rescan_remove();
464 }
465 return count;
466 }
467 static DEVICE_ATTR_WO(dev_rescan);
468
remove_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)469 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
470 const char *buf, size_t count)
471 {
472 unsigned long val;
473
474 if (kstrtoul(buf, 0, &val) < 0)
475 return -EINVAL;
476
477 if (val && device_remove_file_self(dev, attr))
478 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
479 return count;
480 }
481 static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0220, NULL,
482 remove_store);
483
bus_rescan_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)484 static ssize_t bus_rescan_store(struct device *dev,
485 struct device_attribute *attr,
486 const char *buf, size_t count)
487 {
488 unsigned long val;
489 struct pci_bus *bus = to_pci_bus(dev);
490
491 if (kstrtoul(buf, 0, &val) < 0)
492 return -EINVAL;
493
494 if (val) {
495 pci_lock_rescan_remove();
496 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
497 pci_rescan_bus_bridge_resize(bus->self);
498 else
499 pci_rescan_bus(bus);
500 pci_unlock_rescan_remove();
501 }
502 return count;
503 }
504 static DEVICE_ATTR_WO(bus_rescan);
505
506 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
d3cold_allowed_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)507 static ssize_t d3cold_allowed_store(struct device *dev,
508 struct device_attribute *attr,
509 const char *buf, size_t count)
510 {
511 struct pci_dev *pdev = to_pci_dev(dev);
512 unsigned long val;
513
514 if (kstrtoul(buf, 0, &val) < 0)
515 return -EINVAL;
516
517 pdev->d3cold_allowed = !!val;
518 if (pdev->d3cold_allowed)
519 pci_d3cold_enable(pdev);
520 else
521 pci_d3cold_disable(pdev);
522
523 pm_runtime_resume(dev);
524
525 return count;
526 }
527
d3cold_allowed_show(struct device * dev,struct device_attribute * attr,char * buf)528 static ssize_t d3cold_allowed_show(struct device *dev,
529 struct device_attribute *attr, char *buf)
530 {
531 struct pci_dev *pdev = to_pci_dev(dev);
532 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
533 }
534 static DEVICE_ATTR_RW(d3cold_allowed);
535 #endif
536
537 #ifdef CONFIG_OF
devspec_show(struct device * dev,struct device_attribute * attr,char * buf)538 static ssize_t devspec_show(struct device *dev,
539 struct device_attribute *attr, char *buf)
540 {
541 struct pci_dev *pdev = to_pci_dev(dev);
542 struct device_node *np = pci_device_to_OF_node(pdev);
543
544 if (np == NULL)
545 return 0;
546 return sprintf(buf, "%pOF", np);
547 }
548 static DEVICE_ATTR_RO(devspec);
549 #endif
550
driver_override_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)551 static ssize_t driver_override_store(struct device *dev,
552 struct device_attribute *attr,
553 const char *buf, size_t count)
554 {
555 struct pci_dev *pdev = to_pci_dev(dev);
556 char *driver_override, *old, *cp;
557
558 /* We need to keep extra room for a newline */
559 if (count >= (PAGE_SIZE - 1))
560 return -EINVAL;
561
562 driver_override = kstrndup(buf, count, GFP_KERNEL);
563 if (!driver_override)
564 return -ENOMEM;
565
566 cp = strchr(driver_override, '\n');
567 if (cp)
568 *cp = '\0';
569
570 device_lock(dev);
571 old = pdev->driver_override;
572 if (strlen(driver_override)) {
573 pdev->driver_override = driver_override;
574 } else {
575 kfree(driver_override);
576 pdev->driver_override = NULL;
577 }
578 device_unlock(dev);
579
580 kfree(old);
581
582 return count;
583 }
584
driver_override_show(struct device * dev,struct device_attribute * attr,char * buf)585 static ssize_t driver_override_show(struct device *dev,
586 struct device_attribute *attr, char *buf)
587 {
588 struct pci_dev *pdev = to_pci_dev(dev);
589 ssize_t len;
590
591 device_lock(dev);
592 len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
593 device_unlock(dev);
594 return len;
595 }
596 static DEVICE_ATTR_RW(driver_override);
597
598 static struct attribute *pci_dev_attrs[] = {
599 &dev_attr_resource.attr,
600 &dev_attr_vendor.attr,
601 &dev_attr_device.attr,
602 &dev_attr_subsystem_vendor.attr,
603 &dev_attr_subsystem_device.attr,
604 &dev_attr_revision.attr,
605 &dev_attr_class.attr,
606 &dev_attr_irq.attr,
607 &dev_attr_local_cpus.attr,
608 &dev_attr_local_cpulist.attr,
609 &dev_attr_modalias.attr,
610 #ifdef CONFIG_NUMA
611 &dev_attr_numa_node.attr,
612 #endif
613 &dev_attr_dma_mask_bits.attr,
614 &dev_attr_consistent_dma_mask_bits.attr,
615 &dev_attr_enable.attr,
616 &dev_attr_broken_parity_status.attr,
617 &dev_attr_msi_bus.attr,
618 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
619 &dev_attr_d3cold_allowed.attr,
620 #endif
621 #ifdef CONFIG_OF
622 &dev_attr_devspec.attr,
623 #endif
624 &dev_attr_driver_override.attr,
625 &dev_attr_ari_enabled.attr,
626 NULL,
627 };
628
629 static struct attribute *pci_bridge_attrs[] = {
630 &dev_attr_subordinate_bus_number.attr,
631 &dev_attr_secondary_bus_number.attr,
632 NULL,
633 };
634
635 static struct attribute *pcie_dev_attrs[] = {
636 &dev_attr_current_link_speed.attr,
637 &dev_attr_current_link_width.attr,
638 &dev_attr_max_link_width.attr,
639 &dev_attr_max_link_speed.attr,
640 NULL,
641 };
642
643 static struct attribute *pcibus_attrs[] = {
644 &dev_attr_bus_rescan.attr,
645 &dev_attr_cpuaffinity.attr,
646 &dev_attr_cpulistaffinity.attr,
647 NULL,
648 };
649
650 static const struct attribute_group pcibus_group = {
651 .attrs = pcibus_attrs,
652 };
653
654 const struct attribute_group *pcibus_groups[] = {
655 &pcibus_group,
656 NULL,
657 };
658
boot_vga_show(struct device * dev,struct device_attribute * attr,char * buf)659 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
660 char *buf)
661 {
662 struct pci_dev *pdev = to_pci_dev(dev);
663 struct pci_dev *vga_dev = vga_default_device();
664
665 if (vga_dev)
666 return sprintf(buf, "%u\n", (pdev == vga_dev));
667
668 return sprintf(buf, "%u\n",
669 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
670 IORESOURCE_ROM_SHADOW));
671 }
672 static DEVICE_ATTR_RO(boot_vga);
673
pci_read_config(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)674 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
675 struct bin_attribute *bin_attr, char *buf,
676 loff_t off, size_t count)
677 {
678 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
679 unsigned int size = 64;
680 loff_t init_off = off;
681 u8 *data = (u8 *) buf;
682
683 /* Several chips lock up trying to read undefined config space */
684 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
685 size = dev->cfg_size;
686 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
687 size = 128;
688
689 if (off > size)
690 return 0;
691 if (off + count > size) {
692 size -= off;
693 count = size;
694 } else {
695 size = count;
696 }
697
698 pci_config_pm_runtime_get(dev);
699
700 if ((off & 1) && size) {
701 u8 val;
702 pci_user_read_config_byte(dev, off, &val);
703 data[off - init_off] = val;
704 off++;
705 size--;
706 }
707
708 if ((off & 3) && size > 2) {
709 u16 val;
710 pci_user_read_config_word(dev, off, &val);
711 data[off - init_off] = val & 0xff;
712 data[off - init_off + 1] = (val >> 8) & 0xff;
713 off += 2;
714 size -= 2;
715 }
716
717 while (size > 3) {
718 u32 val;
719 pci_user_read_config_dword(dev, off, &val);
720 data[off - init_off] = val & 0xff;
721 data[off - init_off + 1] = (val >> 8) & 0xff;
722 data[off - init_off + 2] = (val >> 16) & 0xff;
723 data[off - init_off + 3] = (val >> 24) & 0xff;
724 off += 4;
725 size -= 4;
726 }
727
728 if (size >= 2) {
729 u16 val;
730 pci_user_read_config_word(dev, off, &val);
731 data[off - init_off] = val & 0xff;
732 data[off - init_off + 1] = (val >> 8) & 0xff;
733 off += 2;
734 size -= 2;
735 }
736
737 if (size > 0) {
738 u8 val;
739 pci_user_read_config_byte(dev, off, &val);
740 data[off - init_off] = val;
741 off++;
742 --size;
743 }
744
745 pci_config_pm_runtime_put(dev);
746
747 return count;
748 }
749
pci_write_config(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)750 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
751 struct bin_attribute *bin_attr, char *buf,
752 loff_t off, size_t count)
753 {
754 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
755 unsigned int size = count;
756 loff_t init_off = off;
757 u8 *data = (u8 *) buf;
758 int ret;
759
760 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
761 if (ret)
762 return ret;
763
764 if (off > dev->cfg_size)
765 return 0;
766 if (off + count > dev->cfg_size) {
767 size = dev->cfg_size - off;
768 count = size;
769 }
770
771 pci_config_pm_runtime_get(dev);
772
773 if ((off & 1) && size) {
774 pci_user_write_config_byte(dev, off, data[off - init_off]);
775 off++;
776 size--;
777 }
778
779 if ((off & 3) && size > 2) {
780 u16 val = data[off - init_off];
781 val |= (u16) data[off - init_off + 1] << 8;
782 pci_user_write_config_word(dev, off, val);
783 off += 2;
784 size -= 2;
785 }
786
787 while (size > 3) {
788 u32 val = data[off - init_off];
789 val |= (u32) data[off - init_off + 1] << 8;
790 val |= (u32) data[off - init_off + 2] << 16;
791 val |= (u32) data[off - init_off + 3] << 24;
792 pci_user_write_config_dword(dev, off, val);
793 off += 4;
794 size -= 4;
795 }
796
797 if (size >= 2) {
798 u16 val = data[off - init_off];
799 val |= (u16) data[off - init_off + 1] << 8;
800 pci_user_write_config_word(dev, off, val);
801 off += 2;
802 size -= 2;
803 }
804
805 if (size) {
806 pci_user_write_config_byte(dev, off, data[off - init_off]);
807 off++;
808 --size;
809 }
810
811 pci_config_pm_runtime_put(dev);
812
813 return count;
814 }
815
816 #ifdef HAVE_PCI_LEGACY
817 /**
818 * pci_read_legacy_io - read byte(s) from legacy I/O port space
819 * @filp: open sysfs file
820 * @kobj: kobject corresponding to file to read from
821 * @bin_attr: struct bin_attribute for this file
822 * @buf: buffer to store results
823 * @off: offset into legacy I/O port space
824 * @count: number of bytes to read
825 *
826 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
827 * callback routine (pci_legacy_read).
828 */
pci_read_legacy_io(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)829 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
830 struct bin_attribute *bin_attr, char *buf,
831 loff_t off, size_t count)
832 {
833 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
834
835 /* Only support 1, 2 or 4 byte accesses */
836 if (count != 1 && count != 2 && count != 4)
837 return -EINVAL;
838
839 return pci_legacy_read(bus, off, (u32 *)buf, count);
840 }
841
842 /**
843 * pci_write_legacy_io - write byte(s) to legacy I/O port space
844 * @filp: open sysfs file
845 * @kobj: kobject corresponding to file to read from
846 * @bin_attr: struct bin_attribute for this file
847 * @buf: buffer containing value to be written
848 * @off: offset into legacy I/O port space
849 * @count: number of bytes to write
850 *
851 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
852 * callback routine (pci_legacy_write).
853 */
pci_write_legacy_io(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)854 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
855 struct bin_attribute *bin_attr, char *buf,
856 loff_t off, size_t count)
857 {
858 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
859
860 /* Only support 1, 2 or 4 byte accesses */
861 if (count != 1 && count != 2 && count != 4)
862 return -EINVAL;
863
864 return pci_legacy_write(bus, off, *(u32 *)buf, count);
865 }
866
867 /**
868 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
869 * @filp: open sysfs file
870 * @kobj: kobject corresponding to device to be mapped
871 * @attr: struct bin_attribute for this file
872 * @vma: struct vm_area_struct passed to mmap
873 *
874 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
875 * legacy memory space (first meg of bus space) into application virtual
876 * memory space.
877 */
pci_mmap_legacy_mem(struct file * filp,struct kobject * kobj,struct bin_attribute * attr,struct vm_area_struct * vma)878 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
879 struct bin_attribute *attr,
880 struct vm_area_struct *vma)
881 {
882 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
883
884 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
885 }
886
887 /**
888 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
889 * @filp: open sysfs file
890 * @kobj: kobject corresponding to device to be mapped
891 * @attr: struct bin_attribute for this file
892 * @vma: struct vm_area_struct passed to mmap
893 *
894 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
895 * legacy IO space (first meg of bus space) into application virtual
896 * memory space. Returns -ENOSYS if the operation isn't supported
897 */
pci_mmap_legacy_io(struct file * filp,struct kobject * kobj,struct bin_attribute * attr,struct vm_area_struct * vma)898 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
899 struct bin_attribute *attr,
900 struct vm_area_struct *vma)
901 {
902 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
903
904 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
905 }
906
907 /**
908 * pci_adjust_legacy_attr - adjustment of legacy file attributes
909 * @b: bus to create files under
910 * @mmap_type: I/O port or memory
911 *
912 * Stub implementation. Can be overridden by arch if necessary.
913 */
pci_adjust_legacy_attr(struct pci_bus * b,enum pci_mmap_state mmap_type)914 void __weak pci_adjust_legacy_attr(struct pci_bus *b,
915 enum pci_mmap_state mmap_type)
916 {
917 }
918
919 /**
920 * pci_create_legacy_files - create legacy I/O port and memory files
921 * @b: bus to create files under
922 *
923 * Some platforms allow access to legacy I/O port and ISA memory space on
924 * a per-bus basis. This routine creates the files and ties them into
925 * their associated read, write and mmap files from pci-sysfs.c
926 *
927 * On error unwind, but don't propagate the error to the caller
928 * as it is ok to set up the PCI bus without these files.
929 */
pci_create_legacy_files(struct pci_bus * b)930 void pci_create_legacy_files(struct pci_bus *b)
931 {
932 int error;
933
934 b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
935 GFP_ATOMIC);
936 if (!b->legacy_io)
937 goto kzalloc_err;
938
939 sysfs_bin_attr_init(b->legacy_io);
940 b->legacy_io->attr.name = "legacy_io";
941 b->legacy_io->size = 0xffff;
942 b->legacy_io->attr.mode = 0600;
943 b->legacy_io->read = pci_read_legacy_io;
944 b->legacy_io->write = pci_write_legacy_io;
945 b->legacy_io->mmap = pci_mmap_legacy_io;
946 pci_adjust_legacy_attr(b, pci_mmap_io);
947 error = device_create_bin_file(&b->dev, b->legacy_io);
948 if (error)
949 goto legacy_io_err;
950
951 /* Allocated above after the legacy_io struct */
952 b->legacy_mem = b->legacy_io + 1;
953 sysfs_bin_attr_init(b->legacy_mem);
954 b->legacy_mem->attr.name = "legacy_mem";
955 b->legacy_mem->size = 1024*1024;
956 b->legacy_mem->attr.mode = 0600;
957 b->legacy_mem->mmap = pci_mmap_legacy_mem;
958 pci_adjust_legacy_attr(b, pci_mmap_mem);
959 error = device_create_bin_file(&b->dev, b->legacy_mem);
960 if (error)
961 goto legacy_mem_err;
962
963 return;
964
965 legacy_mem_err:
966 device_remove_bin_file(&b->dev, b->legacy_io);
967 legacy_io_err:
968 kfree(b->legacy_io);
969 b->legacy_io = NULL;
970 kzalloc_err:
971 dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n");
972 }
973
pci_remove_legacy_files(struct pci_bus * b)974 void pci_remove_legacy_files(struct pci_bus *b)
975 {
976 if (b->legacy_io) {
977 device_remove_bin_file(&b->dev, b->legacy_io);
978 device_remove_bin_file(&b->dev, b->legacy_mem);
979 kfree(b->legacy_io); /* both are allocated here */
980 }
981 }
982 #endif /* HAVE_PCI_LEGACY */
983
984 #if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
985
pci_mmap_fits(struct pci_dev * pdev,int resno,struct vm_area_struct * vma,enum pci_mmap_api mmap_api)986 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
987 enum pci_mmap_api mmap_api)
988 {
989 unsigned long nr, start, size;
990 resource_size_t pci_start = 0, pci_end;
991
992 if (pci_resource_len(pdev, resno) == 0)
993 return 0;
994 nr = vma_pages(vma);
995 start = vma->vm_pgoff;
996 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
997 if (mmap_api == PCI_MMAP_PROCFS) {
998 pci_resource_to_user(pdev, resno, &pdev->resource[resno],
999 &pci_start, &pci_end);
1000 pci_start >>= PAGE_SHIFT;
1001 }
1002 if (start >= pci_start && start < pci_start + size &&
1003 start + nr <= pci_start + size)
1004 return 1;
1005 return 0;
1006 }
1007
1008 /**
1009 * pci_mmap_resource - map a PCI resource into user memory space
1010 * @kobj: kobject for mapping
1011 * @attr: struct bin_attribute for the file being mapped
1012 * @vma: struct vm_area_struct passed into the mmap
1013 * @write_combine: 1 for write_combine mapping
1014 *
1015 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1016 */
pci_mmap_resource(struct kobject * kobj,struct bin_attribute * attr,struct vm_area_struct * vma,int write_combine)1017 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1018 struct vm_area_struct *vma, int write_combine)
1019 {
1020 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1021 int bar = (unsigned long)attr->private;
1022 enum pci_mmap_state mmap_type;
1023 struct resource *res = &pdev->resource[bar];
1024 int ret;
1025
1026 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1027 if (ret)
1028 return ret;
1029
1030 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1031 return -EINVAL;
1032
1033 if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1034 return -EINVAL;
1035
1036 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1037
1038 return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1039 }
1040
pci_mmap_resource_uc(struct file * filp,struct kobject * kobj,struct bin_attribute * attr,struct vm_area_struct * vma)1041 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1042 struct bin_attribute *attr,
1043 struct vm_area_struct *vma)
1044 {
1045 return pci_mmap_resource(kobj, attr, vma, 0);
1046 }
1047
pci_mmap_resource_wc(struct file * filp,struct kobject * kobj,struct bin_attribute * attr,struct vm_area_struct * vma)1048 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1049 struct bin_attribute *attr,
1050 struct vm_area_struct *vma)
1051 {
1052 return pci_mmap_resource(kobj, attr, vma, 1);
1053 }
1054
pci_resource_io(struct file * filp,struct kobject * kobj,struct bin_attribute * attr,char * buf,loff_t off,size_t count,bool write)1055 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1056 struct bin_attribute *attr, char *buf,
1057 loff_t off, size_t count, bool write)
1058 {
1059 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1060 int bar = (unsigned long)attr->private;
1061 unsigned long port = off;
1062
1063 port += pci_resource_start(pdev, bar);
1064
1065 if (port > pci_resource_end(pdev, bar))
1066 return 0;
1067
1068 if (port + count - 1 > pci_resource_end(pdev, bar))
1069 return -EINVAL;
1070
1071 switch (count) {
1072 case 1:
1073 if (write)
1074 outb(*(u8 *)buf, port);
1075 else
1076 *(u8 *)buf = inb(port);
1077 return 1;
1078 case 2:
1079 if (write)
1080 outw(*(u16 *)buf, port);
1081 else
1082 *(u16 *)buf = inw(port);
1083 return 2;
1084 case 4:
1085 if (write)
1086 outl(*(u32 *)buf, port);
1087 else
1088 *(u32 *)buf = inl(port);
1089 return 4;
1090 }
1091 return -EINVAL;
1092 }
1093
pci_read_resource_io(struct file * filp,struct kobject * kobj,struct bin_attribute * attr,char * buf,loff_t off,size_t count)1094 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1095 struct bin_attribute *attr, char *buf,
1096 loff_t off, size_t count)
1097 {
1098 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1099 }
1100
pci_write_resource_io(struct file * filp,struct kobject * kobj,struct bin_attribute * attr,char * buf,loff_t off,size_t count)1101 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1102 struct bin_attribute *attr, char *buf,
1103 loff_t off, size_t count)
1104 {
1105 int ret;
1106
1107 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1108 if (ret)
1109 return ret;
1110
1111 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1112 }
1113
1114 /**
1115 * pci_remove_resource_files - cleanup resource files
1116 * @pdev: dev to cleanup
1117 *
1118 * If we created resource files for @pdev, remove them from sysfs and
1119 * free their resources.
1120 */
pci_remove_resource_files(struct pci_dev * pdev)1121 static void pci_remove_resource_files(struct pci_dev *pdev)
1122 {
1123 int i;
1124
1125 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1126 struct bin_attribute *res_attr;
1127
1128 res_attr = pdev->res_attr[i];
1129 if (res_attr) {
1130 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1131 kfree(res_attr);
1132 }
1133
1134 res_attr = pdev->res_attr_wc[i];
1135 if (res_attr) {
1136 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1137 kfree(res_attr);
1138 }
1139 }
1140 }
1141
pci_create_attr(struct pci_dev * pdev,int num,int write_combine)1142 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1143 {
1144 /* allocate attribute structure, piggyback attribute name */
1145 int name_len = write_combine ? 13 : 10;
1146 struct bin_attribute *res_attr;
1147 char *res_attr_name;
1148 int retval;
1149
1150 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1151 if (!res_attr)
1152 return -ENOMEM;
1153
1154 res_attr_name = (char *)(res_attr + 1);
1155
1156 sysfs_bin_attr_init(res_attr);
1157 if (write_combine) {
1158 pdev->res_attr_wc[num] = res_attr;
1159 sprintf(res_attr_name, "resource%d_wc", num);
1160 res_attr->mmap = pci_mmap_resource_wc;
1161 } else {
1162 pdev->res_attr[num] = res_attr;
1163 sprintf(res_attr_name, "resource%d", num);
1164 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1165 res_attr->read = pci_read_resource_io;
1166 res_attr->write = pci_write_resource_io;
1167 if (arch_can_pci_mmap_io())
1168 res_attr->mmap = pci_mmap_resource_uc;
1169 } else {
1170 res_attr->mmap = pci_mmap_resource_uc;
1171 }
1172 }
1173 res_attr->attr.name = res_attr_name;
1174 res_attr->attr.mode = 0600;
1175 res_attr->size = pci_resource_len(pdev, num);
1176 res_attr->private = (void *)(unsigned long)num;
1177 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1178 if (retval)
1179 kfree(res_attr);
1180
1181 return retval;
1182 }
1183
1184 /**
1185 * pci_create_resource_files - create resource files in sysfs for @dev
1186 * @pdev: dev in question
1187 *
1188 * Walk the resources in @pdev creating files for each resource available.
1189 */
pci_create_resource_files(struct pci_dev * pdev)1190 static int pci_create_resource_files(struct pci_dev *pdev)
1191 {
1192 int i;
1193 int retval;
1194
1195 /* Expose the PCI resources from this device as files */
1196 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1197
1198 /* skip empty resources */
1199 if (!pci_resource_len(pdev, i))
1200 continue;
1201
1202 retval = pci_create_attr(pdev, i, 0);
1203 /* for prefetchable resources, create a WC mappable file */
1204 if (!retval && arch_can_pci_mmap_wc() &&
1205 pdev->resource[i].flags & IORESOURCE_PREFETCH)
1206 retval = pci_create_attr(pdev, i, 1);
1207 if (retval) {
1208 pci_remove_resource_files(pdev);
1209 return retval;
1210 }
1211 }
1212 return 0;
1213 }
1214 #else /* !HAVE_PCI_MMAP */
pci_create_resource_files(struct pci_dev * dev)1215 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
pci_remove_resource_files(struct pci_dev * dev)1216 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1217 #endif /* HAVE_PCI_MMAP */
1218
1219 /**
1220 * pci_write_rom - used to enable access to the PCI ROM display
1221 * @filp: sysfs file
1222 * @kobj: kernel object handle
1223 * @bin_attr: struct bin_attribute for this file
1224 * @buf: user input
1225 * @off: file offset
1226 * @count: number of byte in input
1227 *
1228 * writing anything except 0 enables it
1229 */
pci_write_rom(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)1230 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1231 struct bin_attribute *bin_attr, char *buf,
1232 loff_t off, size_t count)
1233 {
1234 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1235
1236 if ((off == 0) && (*buf == '0') && (count == 2))
1237 pdev->rom_attr_enabled = 0;
1238 else
1239 pdev->rom_attr_enabled = 1;
1240
1241 return count;
1242 }
1243
1244 /**
1245 * pci_read_rom - read a PCI ROM
1246 * @filp: sysfs file
1247 * @kobj: kernel object handle
1248 * @bin_attr: struct bin_attribute for this file
1249 * @buf: where to put the data we read from the ROM
1250 * @off: file offset
1251 * @count: number of bytes to read
1252 *
1253 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1254 * device corresponding to @kobj.
1255 */
pci_read_rom(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)1256 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1257 struct bin_attribute *bin_attr, char *buf,
1258 loff_t off, size_t count)
1259 {
1260 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1261 void __iomem *rom;
1262 size_t size;
1263
1264 if (!pdev->rom_attr_enabled)
1265 return -EINVAL;
1266
1267 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1268 if (!rom || !size)
1269 return -EIO;
1270
1271 if (off >= size)
1272 count = 0;
1273 else {
1274 if (off + count > size)
1275 count = size - off;
1276
1277 memcpy_fromio(buf, rom + off, count);
1278 }
1279 pci_unmap_rom(pdev, rom);
1280
1281 return count;
1282 }
1283
1284 static const struct bin_attribute pci_config_attr = {
1285 .attr = {
1286 .name = "config",
1287 .mode = 0644,
1288 },
1289 .size = PCI_CFG_SPACE_SIZE,
1290 .read = pci_read_config,
1291 .write = pci_write_config,
1292 };
1293
1294 static const struct bin_attribute pcie_config_attr = {
1295 .attr = {
1296 .name = "config",
1297 .mode = 0644,
1298 },
1299 .size = PCI_CFG_SPACE_EXP_SIZE,
1300 .read = pci_read_config,
1301 .write = pci_write_config,
1302 };
1303
reset_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1304 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1305 const char *buf, size_t count)
1306 {
1307 struct pci_dev *pdev = to_pci_dev(dev);
1308 unsigned long val;
1309 ssize_t result = kstrtoul(buf, 0, &val);
1310
1311 if (result < 0)
1312 return result;
1313
1314 if (val != 1)
1315 return -EINVAL;
1316
1317 pm_runtime_get_sync(dev);
1318 result = pci_reset_function(pdev);
1319 pm_runtime_put(dev);
1320 if (result < 0)
1321 return result;
1322
1323 return count;
1324 }
1325
1326 static DEVICE_ATTR(reset, 0200, NULL, reset_store);
1327
pci_create_capabilities_sysfs(struct pci_dev * dev)1328 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1329 {
1330 int retval;
1331
1332 pcie_vpd_create_sysfs_dev_files(dev);
1333 pcie_aspm_create_sysfs_dev_files(dev);
1334
1335 if (dev->reset_fn) {
1336 retval = device_create_file(&dev->dev, &dev_attr_reset);
1337 if (retval)
1338 goto error;
1339 }
1340 return 0;
1341
1342 error:
1343 pcie_aspm_remove_sysfs_dev_files(dev);
1344 pcie_vpd_remove_sysfs_dev_files(dev);
1345 return retval;
1346 }
1347
pci_create_sysfs_dev_files(struct pci_dev * pdev)1348 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1349 {
1350 int retval;
1351 int rom_size;
1352 struct bin_attribute *attr;
1353
1354 if (!sysfs_initialized)
1355 return -EACCES;
1356
1357 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1358 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1359 else
1360 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1361 if (retval)
1362 goto err;
1363
1364 retval = pci_create_resource_files(pdev);
1365 if (retval)
1366 goto err_config_file;
1367
1368 /* If the device has a ROM, try to expose it in sysfs. */
1369 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1370 if (rom_size) {
1371 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1372 if (!attr) {
1373 retval = -ENOMEM;
1374 goto err_resource_files;
1375 }
1376 sysfs_bin_attr_init(attr);
1377 attr->size = rom_size;
1378 attr->attr.name = "rom";
1379 attr->attr.mode = 0600;
1380 attr->read = pci_read_rom;
1381 attr->write = pci_write_rom;
1382 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1383 if (retval) {
1384 kfree(attr);
1385 goto err_resource_files;
1386 }
1387 pdev->rom_attr = attr;
1388 }
1389
1390 /* add sysfs entries for various capabilities */
1391 retval = pci_create_capabilities_sysfs(pdev);
1392 if (retval)
1393 goto err_rom_file;
1394
1395 pci_create_firmware_label_files(pdev);
1396
1397 return 0;
1398
1399 err_rom_file:
1400 if (pdev->rom_attr) {
1401 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1402 kfree(pdev->rom_attr);
1403 pdev->rom_attr = NULL;
1404 }
1405 err_resource_files:
1406 pci_remove_resource_files(pdev);
1407 err_config_file:
1408 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1409 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1410 else
1411 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1412 err:
1413 return retval;
1414 }
1415
pci_remove_capabilities_sysfs(struct pci_dev * dev)1416 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1417 {
1418 pcie_vpd_remove_sysfs_dev_files(dev);
1419 pcie_aspm_remove_sysfs_dev_files(dev);
1420 if (dev->reset_fn) {
1421 device_remove_file(&dev->dev, &dev_attr_reset);
1422 dev->reset_fn = 0;
1423 }
1424 }
1425
1426 /**
1427 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1428 * @pdev: device whose entries we should free
1429 *
1430 * Cleanup when @pdev is removed from sysfs.
1431 */
pci_remove_sysfs_dev_files(struct pci_dev * pdev)1432 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1433 {
1434 if (!sysfs_initialized)
1435 return;
1436
1437 pci_remove_capabilities_sysfs(pdev);
1438
1439 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1440 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1441 else
1442 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1443
1444 pci_remove_resource_files(pdev);
1445
1446 if (pdev->rom_attr) {
1447 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1448 kfree(pdev->rom_attr);
1449 pdev->rom_attr = NULL;
1450 }
1451
1452 pci_remove_firmware_label_files(pdev);
1453 }
1454
pci_sysfs_init(void)1455 static int __init pci_sysfs_init(void)
1456 {
1457 struct pci_dev *pdev = NULL;
1458 int retval;
1459
1460 sysfs_initialized = 1;
1461 for_each_pci_dev(pdev) {
1462 retval = pci_create_sysfs_dev_files(pdev);
1463 if (retval) {
1464 pci_dev_put(pdev);
1465 return retval;
1466 }
1467 }
1468
1469 return 0;
1470 }
1471 late_initcall(pci_sysfs_init);
1472
1473 static struct attribute *pci_dev_dev_attrs[] = {
1474 &dev_attr_boot_vga.attr,
1475 NULL,
1476 };
1477
pci_dev_attrs_are_visible(struct kobject * kobj,struct attribute * a,int n)1478 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1479 struct attribute *a, int n)
1480 {
1481 struct device *dev = kobj_to_dev(kobj);
1482 struct pci_dev *pdev = to_pci_dev(dev);
1483
1484 if (a == &dev_attr_boot_vga.attr)
1485 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1486 return 0;
1487
1488 return a->mode;
1489 }
1490
1491 static struct attribute *pci_dev_hp_attrs[] = {
1492 &dev_attr_remove.attr,
1493 &dev_attr_dev_rescan.attr,
1494 NULL,
1495 };
1496
pci_dev_hp_attrs_are_visible(struct kobject * kobj,struct attribute * a,int n)1497 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1498 struct attribute *a, int n)
1499 {
1500 struct device *dev = kobj_to_dev(kobj);
1501 struct pci_dev *pdev = to_pci_dev(dev);
1502
1503 if (pdev->is_virtfn)
1504 return 0;
1505
1506 return a->mode;
1507 }
1508
pci_bridge_attrs_are_visible(struct kobject * kobj,struct attribute * a,int n)1509 static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1510 struct attribute *a, int n)
1511 {
1512 struct device *dev = kobj_to_dev(kobj);
1513 struct pci_dev *pdev = to_pci_dev(dev);
1514
1515 if (pci_is_bridge(pdev))
1516 return a->mode;
1517
1518 return 0;
1519 }
1520
pcie_dev_attrs_are_visible(struct kobject * kobj,struct attribute * a,int n)1521 static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1522 struct attribute *a, int n)
1523 {
1524 struct device *dev = kobj_to_dev(kobj);
1525 struct pci_dev *pdev = to_pci_dev(dev);
1526
1527 if (pci_is_pcie(pdev))
1528 return a->mode;
1529
1530 return 0;
1531 }
1532
1533 static const struct attribute_group pci_dev_group = {
1534 .attrs = pci_dev_attrs,
1535 };
1536
1537 const struct attribute_group *pci_dev_groups[] = {
1538 &pci_dev_group,
1539 NULL,
1540 };
1541
1542 static const struct attribute_group pci_bridge_group = {
1543 .attrs = pci_bridge_attrs,
1544 };
1545
1546 const struct attribute_group *pci_bridge_groups[] = {
1547 &pci_bridge_group,
1548 NULL,
1549 };
1550
1551 static const struct attribute_group pcie_dev_group = {
1552 .attrs = pcie_dev_attrs,
1553 };
1554
1555 const struct attribute_group *pcie_dev_groups[] = {
1556 &pcie_dev_group,
1557 NULL,
1558 };
1559
1560 static const struct attribute_group pci_dev_hp_attr_group = {
1561 .attrs = pci_dev_hp_attrs,
1562 .is_visible = pci_dev_hp_attrs_are_visible,
1563 };
1564
1565 static const struct attribute_group pci_dev_attr_group = {
1566 .attrs = pci_dev_dev_attrs,
1567 .is_visible = pci_dev_attrs_are_visible,
1568 };
1569
1570 static const struct attribute_group pci_bridge_attr_group = {
1571 .attrs = pci_bridge_attrs,
1572 .is_visible = pci_bridge_attrs_are_visible,
1573 };
1574
1575 static const struct attribute_group pcie_dev_attr_group = {
1576 .attrs = pcie_dev_attrs,
1577 .is_visible = pcie_dev_attrs_are_visible,
1578 };
1579
1580 static const struct attribute_group *pci_dev_attr_groups[] = {
1581 &pci_dev_attr_group,
1582 &pci_dev_hp_attr_group,
1583 #ifdef CONFIG_PCI_IOV
1584 &sriov_dev_attr_group,
1585 #endif
1586 &pci_bridge_attr_group,
1587 &pcie_dev_attr_group,
1588 #ifdef CONFIG_PCIEAER
1589 &aer_stats_attr_group,
1590 #endif
1591 NULL,
1592 };
1593
1594 const struct device_type pci_dev_type = {
1595 .groups = pci_dev_attr_groups,
1596 };
1597