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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/*
2 * drivers/pci/pci-sysfs.c
3 *
4 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
5 * (C) Copyright 2002-2004 IBM Corp.
6 * (C) Copyright 2003 Matthew Wilcox
7 * (C) Copyright 2003 Hewlett-Packard
8 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
9 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
10 *
11 * File attributes for PCI devices
12 *
13 * Modeled after usb's driverfs.c
14 *
15 */
16
17
18#include <linux/kernel.h>
19#include <linux/sched.h>
20#include <linux/pci.h>
21#include <linux/stat.h>
22#include <linux/export.h>
23#include <linux/topology.h>
24#include <linux/mm.h>
25#include <linux/fs.h>
26#include <linux/capability.h>
27#include <linux/security.h>
28#include <linux/pci-aspm.h>
29#include <linux/slab.h>
30#include <linux/vgaarb.h>
31#include <linux/pm_runtime.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 sprintf (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(class, "0x%06x\n");
53pci_config_attr(irq, "%u\n");
54
55static ssize_t broken_parity_status_show(struct device *dev,
56 struct device_attribute *attr,
57 char *buf)
58{
59 struct pci_dev *pdev = to_pci_dev(dev);
60 return sprintf (buf, "%u\n", pdev->broken_parity_status);
61}
62
63static ssize_t broken_parity_status_store(struct device *dev,
64 struct device_attribute *attr,
65 const char *buf, size_t count)
66{
67 struct pci_dev *pdev = to_pci_dev(dev);
68 unsigned long val;
69
70 if (kstrtoul(buf, 0, &val) < 0)
71 return -EINVAL;
72
73 pdev->broken_parity_status = !!val;
74
75 return count;
76}
77static DEVICE_ATTR_RW(broken_parity_status);
78
79static ssize_t pci_dev_show_local_cpu(struct device *dev,
80 int type,
81 struct device_attribute *attr,
82 char *buf)
83{
84 const struct cpumask *mask;
85 int len;
86
87#ifdef CONFIG_NUMA
88 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
89 cpumask_of_node(dev_to_node(dev));
90#else
91 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
92#endif
93 len = type ?
94 cpumask_scnprintf(buf, PAGE_SIZE-2, mask) :
95 cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
96
97 buf[len++] = '\n';
98 buf[len] = '\0';
99 return len;
100}
101
102static ssize_t local_cpus_show(struct device *dev,
103 struct device_attribute *attr, char *buf)
104{
105 return pci_dev_show_local_cpu(dev, 1, attr, buf);
106}
107static DEVICE_ATTR_RO(local_cpus);
108
109static ssize_t local_cpulist_show(struct device *dev,
110 struct device_attribute *attr, char *buf)
111{
112 return pci_dev_show_local_cpu(dev, 0, attr, buf);
113}
114static DEVICE_ATTR_RO(local_cpulist);
115
116/*
117 * PCI Bus Class Devices
118 */
119static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
120 int type,
121 struct device_attribute *attr,
122 char *buf)
123{
124 int ret;
125 const struct cpumask *cpumask;
126
127 cpumask = cpumask_of_pcibus(to_pci_bus(dev));
128 ret = type ?
129 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
130 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
131 buf[ret++] = '\n';
132 buf[ret] = '\0';
133 return ret;
134}
135
136static ssize_t cpuaffinity_show(struct device *dev,
137 struct device_attribute *attr, char *buf)
138{
139 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
140}
141static DEVICE_ATTR_RO(cpuaffinity);
142
143static ssize_t cpulistaffinity_show(struct device *dev,
144 struct device_attribute *attr, char *buf)
145{
146 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
147}
148static DEVICE_ATTR_RO(cpulistaffinity);
149
150/* show resources */
151static ssize_t
152resource_show(struct device * dev, struct device_attribute *attr, char * buf)
153{
154 struct pci_dev * pci_dev = to_pci_dev(dev);
155 char * str = buf;
156 int i;
157 int max;
158 resource_size_t start, end;
159
160 if (pci_dev->subordinate)
161 max = DEVICE_COUNT_RESOURCE;
162 else
163 max = PCI_BRIDGE_RESOURCES;
164
165 for (i = 0; i < max; i++) {
166 struct resource *res = &pci_dev->resource[i];
167 pci_resource_to_user(pci_dev, i, res, &start, &end);
168 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
169 (unsigned long long)start,
170 (unsigned long long)end,
171 (unsigned long long)res->flags);
172 }
173 return (str - buf);
174}
175static DEVICE_ATTR_RO(resource);
176
177static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
178{
179 struct pci_dev *pci_dev = to_pci_dev(dev);
180
181 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
182 pci_dev->vendor, pci_dev->device,
183 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
184 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
185 (u8)(pci_dev->class));
186}
187static DEVICE_ATTR_RO(modalias);
188
189static ssize_t enabled_store(struct device *dev,
190 struct device_attribute *attr, const char *buf,
191 size_t count)
192{
193 struct pci_dev *pdev = to_pci_dev(dev);
194 unsigned long val;
195 ssize_t result = kstrtoul(buf, 0, &val);
196
197 if (result < 0)
198 return result;
199
200 /* this can crash the machine when done on the "wrong" device */
201 if (!capable(CAP_SYS_ADMIN))
202 return -EPERM;
203
204 if (!val) {
205 if (pci_is_enabled(pdev))
206 pci_disable_device(pdev);
207 else
208 result = -EIO;
209 } else
210 result = pci_enable_device(pdev);
211
212 return result < 0 ? result : count;
213}
214
215static ssize_t enabled_show(struct device *dev,
216 struct device_attribute *attr, char *buf)
217{
218 struct pci_dev *pdev;
219
220 pdev = to_pci_dev (dev);
221 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
222}
223static DEVICE_ATTR_RW(enabled);
224
225#ifdef CONFIG_NUMA
226static ssize_t
227numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
228{
229 return sprintf (buf, "%d\n", dev->numa_node);
230}
231static DEVICE_ATTR_RO(numa_node);
232#endif
233
234static ssize_t
235dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
236{
237 struct pci_dev *pdev = to_pci_dev(dev);
238
239 return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
240}
241static DEVICE_ATTR_RO(dma_mask_bits);
242
243static ssize_t
244consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
245 char *buf)
246{
247 return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
248}
249static DEVICE_ATTR_RO(consistent_dma_mask_bits);
250
251static ssize_t
252msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
253{
254 struct pci_dev *pdev = to_pci_dev(dev);
255
256 if (!pdev->subordinate)
257 return 0;
258
259 return sprintf (buf, "%u\n",
260 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
261}
262
263static ssize_t
264msi_bus_store(struct device *dev, struct device_attribute *attr,
265 const char *buf, size_t count)
266{
267 struct pci_dev *pdev = to_pci_dev(dev);
268 unsigned long val;
269
270 if (kstrtoul(buf, 0, &val) < 0)
271 return -EINVAL;
272
273 /*
274 * Bad things may happen if the no_msi flag is changed
275 * while drivers are loaded.
276 */
277 if (!capable(CAP_SYS_ADMIN))
278 return -EPERM;
279
280 /*
281 * Maybe devices without subordinate buses shouldn't have this
282 * attribute in the first place?
283 */
284 if (!pdev->subordinate)
285 return count;
286
287 /* Is the flag going to change, or keep the value it already had? */
288 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
289 !!val) {
290 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
291
292 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
293 " bad things could happen\n", val ? "" : " not");
294 }
295
296 return count;
297}
298static DEVICE_ATTR_RW(msi_bus);
299
300static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
301 size_t count)
302{
303 unsigned long val;
304 struct pci_bus *b = NULL;
305
306 if (kstrtoul(buf, 0, &val) < 0)
307 return -EINVAL;
308
309 if (val) {
310 pci_lock_rescan_remove();
311 while ((b = pci_find_next_bus(b)) != NULL)
312 pci_rescan_bus(b);
313 pci_unlock_rescan_remove();
314 }
315 return count;
316}
317static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
318
319static struct attribute *pci_bus_attrs[] = {
320 &bus_attr_rescan.attr,
321 NULL,
322};
323
324static const struct attribute_group pci_bus_group = {
325 .attrs = pci_bus_attrs,
326};
327
328const struct attribute_group *pci_bus_groups[] = {
329 &pci_bus_group,
330 NULL,
331};
332
333static ssize_t
334dev_rescan_store(struct device *dev, struct device_attribute *attr,
335 const char *buf, size_t count)
336{
337 unsigned long val;
338 struct pci_dev *pdev = to_pci_dev(dev);
339
340 if (kstrtoul(buf, 0, &val) < 0)
341 return -EINVAL;
342
343 if (val) {
344 pci_lock_rescan_remove();
345 pci_rescan_bus(pdev->bus);
346 pci_unlock_rescan_remove();
347 }
348 return count;
349}
350static struct device_attribute dev_rescan_attr = __ATTR(rescan,
351 (S_IWUSR|S_IWGRP),
352 NULL, dev_rescan_store);
353
354static ssize_t
355remove_store(struct device *dev, struct device_attribute *attr,
356 const char *buf, size_t count)
357{
358 unsigned long val;
359
360 if (kstrtoul(buf, 0, &val) < 0)
361 return -EINVAL;
362
363 if (val && device_remove_file_self(dev, attr))
364 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
365 return count;
366}
367static struct device_attribute dev_remove_attr = __ATTR(remove,
368 (S_IWUSR|S_IWGRP),
369 NULL, remove_store);
370
371static ssize_t
372dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
373 const char *buf, size_t count)
374{
375 unsigned long val;
376 struct pci_bus *bus = to_pci_bus(dev);
377
378 if (kstrtoul(buf, 0, &val) < 0)
379 return -EINVAL;
380
381 if (val) {
382 pci_lock_rescan_remove();
383 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
384 pci_rescan_bus_bridge_resize(bus->self);
385 else
386 pci_rescan_bus(bus);
387 pci_unlock_rescan_remove();
388 }
389 return count;
390}
391static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
392
393#if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
394static ssize_t d3cold_allowed_store(struct device *dev,
395 struct device_attribute *attr,
396 const char *buf, size_t count)
397{
398 struct pci_dev *pdev = to_pci_dev(dev);
399 unsigned long val;
400
401 if (kstrtoul(buf, 0, &val) < 0)
402 return -EINVAL;
403
404 pdev->d3cold_allowed = !!val;
405 pm_runtime_resume(dev);
406
407 return count;
408}
409
410static ssize_t d3cold_allowed_show(struct device *dev,
411 struct device_attribute *attr, char *buf)
412{
413 struct pci_dev *pdev = to_pci_dev(dev);
414 return sprintf (buf, "%u\n", pdev->d3cold_allowed);
415}
416static DEVICE_ATTR_RW(d3cold_allowed);
417#endif
418
419#ifdef CONFIG_PCI_IOV
420static ssize_t sriov_totalvfs_show(struct device *dev,
421 struct device_attribute *attr,
422 char *buf)
423{
424 struct pci_dev *pdev = to_pci_dev(dev);
425
426 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
427}
428
429
430static ssize_t sriov_numvfs_show(struct device *dev,
431 struct device_attribute *attr,
432 char *buf)
433{
434 struct pci_dev *pdev = to_pci_dev(dev);
435
436 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
437}
438
439/*
440 * num_vfs > 0; number of VFs to enable
441 * num_vfs = 0; disable all VFs
442 *
443 * Note: SRIOV spec doesn't allow partial VF
444 * disable, so it's all or none.
445 */
446static ssize_t sriov_numvfs_store(struct device *dev,
447 struct device_attribute *attr,
448 const char *buf, size_t count)
449{
450 struct pci_dev *pdev = to_pci_dev(dev);
451 int ret;
452 u16 num_vfs;
453
454 ret = kstrtou16(buf, 0, &num_vfs);
455 if (ret < 0)
456 return ret;
457
458 if (num_vfs > pci_sriov_get_totalvfs(pdev))
459 return -ERANGE;
460
461 if (num_vfs == pdev->sriov->num_VFs)
462 return count; /* no change */
463
464 /* is PF driver loaded w/callback */
465 if (!pdev->driver || !pdev->driver->sriov_configure) {
466 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
467 return -ENOSYS;
468 }
469
470 if (num_vfs == 0) {
471 /* disable VFs */
472 ret = pdev->driver->sriov_configure(pdev, 0);
473 if (ret < 0)
474 return ret;
475 return count;
476 }
477
478 /* enable VFs */
479 if (pdev->sriov->num_VFs) {
480 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
481 pdev->sriov->num_VFs, num_vfs);
482 return -EBUSY;
483 }
484
485 ret = pdev->driver->sriov_configure(pdev, num_vfs);
486 if (ret < 0)
487 return ret;
488
489 if (ret != num_vfs)
490 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
491 num_vfs, ret);
492
493 return count;
494}
495
496static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
497static struct device_attribute sriov_numvfs_attr =
498 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
499 sriov_numvfs_show, sriov_numvfs_store);
500#endif /* CONFIG_PCI_IOV */
501
502static struct attribute *pci_dev_attrs[] = {
503 &dev_attr_resource.attr,
504 &dev_attr_vendor.attr,
505 &dev_attr_device.attr,
506 &dev_attr_subsystem_vendor.attr,
507 &dev_attr_subsystem_device.attr,
508 &dev_attr_class.attr,
509 &dev_attr_irq.attr,
510 &dev_attr_local_cpus.attr,
511 &dev_attr_local_cpulist.attr,
512 &dev_attr_modalias.attr,
513#ifdef CONFIG_NUMA
514 &dev_attr_numa_node.attr,
515#endif
516 &dev_attr_dma_mask_bits.attr,
517 &dev_attr_consistent_dma_mask_bits.attr,
518 &dev_attr_enabled.attr,
519 &dev_attr_broken_parity_status.attr,
520 &dev_attr_msi_bus.attr,
521#if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
522 &dev_attr_d3cold_allowed.attr,
523#endif
524 NULL,
525};
526
527static const struct attribute_group pci_dev_group = {
528 .attrs = pci_dev_attrs,
529};
530
531const struct attribute_group *pci_dev_groups[] = {
532 &pci_dev_group,
533 NULL,
534};
535
536static struct attribute *pcibus_attrs[] = {
537 &dev_attr_rescan.attr,
538 &dev_attr_cpuaffinity.attr,
539 &dev_attr_cpulistaffinity.attr,
540 NULL,
541};
542
543static const struct attribute_group pcibus_group = {
544 .attrs = pcibus_attrs,
545};
546
547const struct attribute_group *pcibus_groups[] = {
548 &pcibus_group,
549 NULL,
550};
551
552static ssize_t
553boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
554{
555 struct pci_dev *pdev = to_pci_dev(dev);
556 struct pci_dev *vga_dev = vga_default_device();
557
558 if (vga_dev)
559 return sprintf(buf, "%u\n", (pdev == vga_dev));
560
561 return sprintf(buf, "%u\n",
562 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
563 IORESOURCE_ROM_SHADOW));
564}
565static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
566
567static ssize_t
568pci_read_config(struct file *filp, struct kobject *kobj,
569 struct bin_attribute *bin_attr,
570 char *buf, loff_t off, size_t count)
571{
572 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
573 unsigned int size = 64;
574 loff_t init_off = off;
575 u8 *data = (u8*) buf;
576
577 /* Several chips lock up trying to read undefined config space */
578 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
579 size = dev->cfg_size;
580 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
581 size = 128;
582 }
583
584 if (off > size)
585 return 0;
586 if (off + count > size) {
587 size -= off;
588 count = size;
589 } else {
590 size = count;
591 }
592
593 pci_config_pm_runtime_get(dev);
594
595 if ((off & 1) && size) {
596 u8 val;
597 pci_user_read_config_byte(dev, off, &val);
598 data[off - init_off] = val;
599 off++;
600 size--;
601 }
602
603 if ((off & 3) && size > 2) {
604 u16 val;
605 pci_user_read_config_word(dev, off, &val);
606 data[off - init_off] = val & 0xff;
607 data[off - init_off + 1] = (val >> 8) & 0xff;
608 off += 2;
609 size -= 2;
610 }
611
612 while (size > 3) {
613 u32 val;
614 pci_user_read_config_dword(dev, off, &val);
615 data[off - init_off] = val & 0xff;
616 data[off - init_off + 1] = (val >> 8) & 0xff;
617 data[off - init_off + 2] = (val >> 16) & 0xff;
618 data[off - init_off + 3] = (val >> 24) & 0xff;
619 off += 4;
620 size -= 4;
621 }
622
623 if (size >= 2) {
624 u16 val;
625 pci_user_read_config_word(dev, off, &val);
626 data[off - init_off] = val & 0xff;
627 data[off - init_off + 1] = (val >> 8) & 0xff;
628 off += 2;
629 size -= 2;
630 }
631
632 if (size > 0) {
633 u8 val;
634 pci_user_read_config_byte(dev, off, &val);
635 data[off - init_off] = val;
636 off++;
637 --size;
638 }
639
640 pci_config_pm_runtime_put(dev);
641
642 return count;
643}
644
645static ssize_t
646pci_write_config(struct file* filp, struct kobject *kobj,
647 struct bin_attribute *bin_attr,
648 char *buf, loff_t off, size_t count)
649{
650 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
651 unsigned int size = count;
652 loff_t init_off = off;
653 u8 *data = (u8*) buf;
654
655 if (off > dev->cfg_size)
656 return 0;
657 if (off + count > dev->cfg_size) {
658 size = dev->cfg_size - off;
659 count = size;
660 }
661
662 pci_config_pm_runtime_get(dev);
663
664 if ((off & 1) && size) {
665 pci_user_write_config_byte(dev, off, data[off - init_off]);
666 off++;
667 size--;
668 }
669
670 if ((off & 3) && size > 2) {
671 u16 val = data[off - init_off];
672 val |= (u16) data[off - init_off + 1] << 8;
673 pci_user_write_config_word(dev, off, val);
674 off += 2;
675 size -= 2;
676 }
677
678 while (size > 3) {
679 u32 val = data[off - init_off];
680 val |= (u32) data[off - init_off + 1] << 8;
681 val |= (u32) data[off - init_off + 2] << 16;
682 val |= (u32) data[off - init_off + 3] << 24;
683 pci_user_write_config_dword(dev, off, val);
684 off += 4;
685 size -= 4;
686 }
687
688 if (size >= 2) {
689 u16 val = data[off - init_off];
690 val |= (u16) data[off - init_off + 1] << 8;
691 pci_user_write_config_word(dev, off, val);
692 off += 2;
693 size -= 2;
694 }
695
696 if (size) {
697 pci_user_write_config_byte(dev, off, data[off - init_off]);
698 off++;
699 --size;
700 }
701
702 pci_config_pm_runtime_put(dev);
703
704 return count;
705}
706
707static ssize_t
708read_vpd_attr(struct file *filp, struct kobject *kobj,
709 struct bin_attribute *bin_attr,
710 char *buf, loff_t off, size_t count)
711{
712 struct pci_dev *dev =
713 to_pci_dev(container_of(kobj, struct device, kobj));
714
715 if (off > bin_attr->size)
716 count = 0;
717 else if (count > bin_attr->size - off)
718 count = bin_attr->size - off;
719
720 return pci_read_vpd(dev, off, count, buf);
721}
722
723static ssize_t
724write_vpd_attr(struct file *filp, struct kobject *kobj,
725 struct bin_attribute *bin_attr,
726 char *buf, loff_t off, size_t count)
727{
728 struct pci_dev *dev =
729 to_pci_dev(container_of(kobj, struct device, kobj));
730
731 if (off > bin_attr->size)
732 count = 0;
733 else if (count > bin_attr->size - off)
734 count = bin_attr->size - off;
735
736 return pci_write_vpd(dev, off, count, buf);
737}
738
739#ifdef HAVE_PCI_LEGACY
740/**
741 * pci_read_legacy_io - read byte(s) from legacy I/O port space
742 * @filp: open sysfs file
743 * @kobj: kobject corresponding to file to read from
744 * @bin_attr: struct bin_attribute for this file
745 * @buf: buffer to store results
746 * @off: offset into legacy I/O port space
747 * @count: number of bytes to read
748 *
749 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
750 * callback routine (pci_legacy_read).
751 */
752static ssize_t
753pci_read_legacy_io(struct file *filp, struct kobject *kobj,
754 struct bin_attribute *bin_attr,
755 char *buf, loff_t off, size_t count)
756{
757 struct pci_bus *bus = to_pci_bus(container_of(kobj,
758 struct device,
759 kobj));
760
761 /* Only support 1, 2 or 4 byte accesses */
762 if (count != 1 && count != 2 && count != 4)
763 return -EINVAL;
764
765 return pci_legacy_read(bus, off, (u32 *)buf, count);
766}
767
768/**
769 * pci_write_legacy_io - write byte(s) to legacy I/O port space
770 * @filp: open sysfs file
771 * @kobj: kobject corresponding to file to read from
772 * @bin_attr: struct bin_attribute for this file
773 * @buf: buffer containing value to be written
774 * @off: offset into legacy I/O port space
775 * @count: number of bytes to write
776 *
777 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
778 * callback routine (pci_legacy_write).
779 */
780static ssize_t
781pci_write_legacy_io(struct file *filp, struct kobject *kobj,
782 struct bin_attribute *bin_attr,
783 char *buf, loff_t off, size_t count)
784{
785 struct pci_bus *bus = to_pci_bus(container_of(kobj,
786 struct device,
787 kobj));
788 /* Only support 1, 2 or 4 byte accesses */
789 if (count != 1 && count != 2 && count != 4)
790 return -EINVAL;
791
792 return pci_legacy_write(bus, off, *(u32 *)buf, count);
793}
794
795/**
796 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
797 * @filp: open sysfs file
798 * @kobj: kobject corresponding to device to be mapped
799 * @attr: struct bin_attribute for this file
800 * @vma: struct vm_area_struct passed to mmap
801 *
802 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
803 * legacy memory space (first meg of bus space) into application virtual
804 * memory space.
805 */
806static int
807pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
808 struct bin_attribute *attr,
809 struct vm_area_struct *vma)
810{
811 struct pci_bus *bus = to_pci_bus(container_of(kobj,
812 struct device,
813 kobj));
814
815 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
816}
817
818/**
819 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
820 * @filp: open sysfs file
821 * @kobj: kobject corresponding to device to be mapped
822 * @attr: struct bin_attribute for this file
823 * @vma: struct vm_area_struct passed to mmap
824 *
825 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
826 * legacy IO space (first meg of bus space) into application virtual
827 * memory space. Returns -ENOSYS if the operation isn't supported
828 */
829static int
830pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
831 struct bin_attribute *attr,
832 struct vm_area_struct *vma)
833{
834 struct pci_bus *bus = to_pci_bus(container_of(kobj,
835 struct device,
836 kobj));
837
838 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
839}
840
841/**
842 * pci_adjust_legacy_attr - adjustment of legacy file attributes
843 * @b: bus to create files under
844 * @mmap_type: I/O port or memory
845 *
846 * Stub implementation. Can be overridden by arch if necessary.
847 */
848void __weak
849pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
850{
851 return;
852}
853
854/**
855 * pci_create_legacy_files - create legacy I/O port and memory files
856 * @b: bus to create files under
857 *
858 * Some platforms allow access to legacy I/O port and ISA memory space on
859 * a per-bus basis. This routine creates the files and ties them into
860 * their associated read, write and mmap files from pci-sysfs.c
861 *
862 * On error unwind, but don't propagate the error to the caller
863 * as it is ok to set up the PCI bus without these files.
864 */
865void pci_create_legacy_files(struct pci_bus *b)
866{
867 int error;
868
869 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
870 GFP_ATOMIC);
871 if (!b->legacy_io)
872 goto kzalloc_err;
873
874 sysfs_bin_attr_init(b->legacy_io);
875 b->legacy_io->attr.name = "legacy_io";
876 b->legacy_io->size = 0xffff;
877 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
878 b->legacy_io->read = pci_read_legacy_io;
879 b->legacy_io->write = pci_write_legacy_io;
880 b->legacy_io->mmap = pci_mmap_legacy_io;
881 pci_adjust_legacy_attr(b, pci_mmap_io);
882 error = device_create_bin_file(&b->dev, b->legacy_io);
883 if (error)
884 goto legacy_io_err;
885
886 /* Allocated above after the legacy_io struct */
887 b->legacy_mem = b->legacy_io + 1;
888 sysfs_bin_attr_init(b->legacy_mem);
889 b->legacy_mem->attr.name = "legacy_mem";
890 b->legacy_mem->size = 1024*1024;
891 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
892 b->legacy_mem->mmap = pci_mmap_legacy_mem;
893 pci_adjust_legacy_attr(b, pci_mmap_mem);
894 error = device_create_bin_file(&b->dev, b->legacy_mem);
895 if (error)
896 goto legacy_mem_err;
897
898 return;
899
900legacy_mem_err:
901 device_remove_bin_file(&b->dev, b->legacy_io);
902legacy_io_err:
903 kfree(b->legacy_io);
904 b->legacy_io = NULL;
905kzalloc_err:
906 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
907 "and ISA memory resources to sysfs\n");
908 return;
909}
910
911void pci_remove_legacy_files(struct pci_bus *b)
912{
913 if (b->legacy_io) {
914 device_remove_bin_file(&b->dev, b->legacy_io);
915 device_remove_bin_file(&b->dev, b->legacy_mem);
916 kfree(b->legacy_io); /* both are allocated here */
917 }
918}
919#endif /* HAVE_PCI_LEGACY */
920
921#ifdef HAVE_PCI_MMAP
922
923int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
924 enum pci_mmap_api mmap_api)
925{
926 unsigned long nr, start, size, pci_start;
927
928 if (pci_resource_len(pdev, resno) == 0)
929 return 0;
930 nr = vma_pages(vma);
931 start = vma->vm_pgoff;
932 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
933 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
934 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
935 if (start >= pci_start && start < pci_start + size &&
936 start + nr <= pci_start + size)
937 return 1;
938 return 0;
939}
940
941/**
942 * pci_mmap_resource - map a PCI resource into user memory space
943 * @kobj: kobject for mapping
944 * @attr: struct bin_attribute for the file being mapped
945 * @vma: struct vm_area_struct passed into the mmap
946 * @write_combine: 1 for write_combine mapping
947 *
948 * Use the regular PCI mapping routines to map a PCI resource into userspace.
949 */
950static int
951pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
952 struct vm_area_struct *vma, int write_combine)
953{
954 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
955 struct device, kobj));
956 struct resource *res = attr->private;
957 enum pci_mmap_state mmap_type;
958 resource_size_t start, end;
959 int i;
960
961 for (i = 0; i < PCI_ROM_RESOURCE; i++)
962 if (res == &pdev->resource[i])
963 break;
964 if (i >= PCI_ROM_RESOURCE)
965 return -ENODEV;
966
967 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
968 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
969 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
970 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
971 pci_name(pdev), i,
972 (u64)pci_resource_start(pdev, i),
973 (u64)pci_resource_len(pdev, i));
974 return -EINVAL;
975 }
976
977 /* pci_mmap_page_range() expects the same kind of entry as coming
978 * from /proc/bus/pci/ which is a "user visible" value. If this is
979 * different from the resource itself, arch will do necessary fixup.
980 */
981 pci_resource_to_user(pdev, i, res, &start, &end);
982 vma->vm_pgoff += start >> PAGE_SHIFT;
983 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
984
985 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
986 return -EINVAL;
987
988 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
989}
990
991static int
992pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
993 struct bin_attribute *attr,
994 struct vm_area_struct *vma)
995{
996 return pci_mmap_resource(kobj, attr, vma, 0);
997}
998
999static int
1000pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1001 struct bin_attribute *attr,
1002 struct vm_area_struct *vma)
1003{
1004 return pci_mmap_resource(kobj, attr, vma, 1);
1005}
1006
1007static ssize_t
1008pci_resource_io(struct file *filp, struct kobject *kobj,
1009 struct bin_attribute *attr, char *buf,
1010 loff_t off, size_t count, bool write)
1011{
1012 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1013 struct device, kobj));
1014 struct resource *res = attr->private;
1015 unsigned long port = off;
1016 int i;
1017
1018 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1019 if (res == &pdev->resource[i])
1020 break;
1021 if (i >= PCI_ROM_RESOURCE)
1022 return -ENODEV;
1023
1024 port += pci_resource_start(pdev, i);
1025
1026 if (port > pci_resource_end(pdev, i))
1027 return 0;
1028
1029 if (port + count - 1 > pci_resource_end(pdev, i))
1030 return -EINVAL;
1031
1032 switch (count) {
1033 case 1:
1034 if (write)
1035 outb(*(u8 *)buf, port);
1036 else
1037 *(u8 *)buf = inb(port);
1038 return 1;
1039 case 2:
1040 if (write)
1041 outw(*(u16 *)buf, port);
1042 else
1043 *(u16 *)buf = inw(port);
1044 return 2;
1045 case 4:
1046 if (write)
1047 outl(*(u32 *)buf, port);
1048 else
1049 *(u32 *)buf = inl(port);
1050 return 4;
1051 }
1052 return -EINVAL;
1053}
1054
1055static ssize_t
1056pci_read_resource_io(struct file *filp, struct kobject *kobj,
1057 struct bin_attribute *attr, char *buf,
1058 loff_t off, size_t count)
1059{
1060 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1061}
1062
1063static ssize_t
1064pci_write_resource_io(struct file *filp, struct kobject *kobj,
1065 struct bin_attribute *attr, char *buf,
1066 loff_t off, size_t count)
1067{
1068 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1069}
1070
1071/**
1072 * pci_remove_resource_files - cleanup resource files
1073 * @pdev: dev to cleanup
1074 *
1075 * If we created resource files for @pdev, remove them from sysfs and
1076 * free their resources.
1077 */
1078static void
1079pci_remove_resource_files(struct pci_dev *pdev)
1080{
1081 int i;
1082
1083 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1084 struct bin_attribute *res_attr;
1085
1086 res_attr = pdev->res_attr[i];
1087 if (res_attr) {
1088 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1089 kfree(res_attr);
1090 }
1091
1092 res_attr = pdev->res_attr_wc[i];
1093 if (res_attr) {
1094 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1095 kfree(res_attr);
1096 }
1097 }
1098}
1099
1100static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1101{
1102 /* allocate attribute structure, piggyback attribute name */
1103 int name_len = write_combine ? 13 : 10;
1104 struct bin_attribute *res_attr;
1105 int retval;
1106
1107 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1108 if (res_attr) {
1109 char *res_attr_name = (char *)(res_attr + 1);
1110
1111 sysfs_bin_attr_init(res_attr);
1112 if (write_combine) {
1113 pdev->res_attr_wc[num] = res_attr;
1114 sprintf(res_attr_name, "resource%d_wc", num);
1115 res_attr->mmap = pci_mmap_resource_wc;
1116 } else {
1117 pdev->res_attr[num] = res_attr;
1118 sprintf(res_attr_name, "resource%d", num);
1119 res_attr->mmap = pci_mmap_resource_uc;
1120 }
1121 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1122 res_attr->read = pci_read_resource_io;
1123 res_attr->write = pci_write_resource_io;
1124 }
1125 res_attr->attr.name = res_attr_name;
1126 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1127 res_attr->size = pci_resource_len(pdev, num);
1128 res_attr->private = &pdev->resource[num];
1129 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1130 } else
1131 retval = -ENOMEM;
1132
1133 return retval;
1134}
1135
1136/**
1137 * pci_create_resource_files - create resource files in sysfs for @dev
1138 * @pdev: dev in question
1139 *
1140 * Walk the resources in @pdev creating files for each resource available.
1141 */
1142static int pci_create_resource_files(struct pci_dev *pdev)
1143{
1144 int i;
1145 int retval;
1146
1147 /* Expose the PCI resources from this device as files */
1148 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1149
1150 /* skip empty resources */
1151 if (!pci_resource_len(pdev, i))
1152 continue;
1153
1154 retval = pci_create_attr(pdev, i, 0);
1155 /* for prefetchable resources, create a WC mappable file */
1156 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1157 retval = pci_create_attr(pdev, i, 1);
1158
1159 if (retval) {
1160 pci_remove_resource_files(pdev);
1161 return retval;
1162 }
1163 }
1164 return 0;
1165}
1166#else /* !HAVE_PCI_MMAP */
1167int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1168void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1169#endif /* HAVE_PCI_MMAP */
1170
1171/**
1172 * pci_write_rom - used to enable access to the PCI ROM display
1173 * @filp: sysfs file
1174 * @kobj: kernel object handle
1175 * @bin_attr: struct bin_attribute for this file
1176 * @buf: user input
1177 * @off: file offset
1178 * @count: number of byte in input
1179 *
1180 * writing anything except 0 enables it
1181 */
1182static ssize_t
1183pci_write_rom(struct file *filp, struct kobject *kobj,
1184 struct bin_attribute *bin_attr,
1185 char *buf, loff_t off, size_t count)
1186{
1187 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1188
1189 if ((off == 0) && (*buf == '0') && (count == 2))
1190 pdev->rom_attr_enabled = 0;
1191 else
1192 pdev->rom_attr_enabled = 1;
1193
1194 return count;
1195}
1196
1197/**
1198 * pci_read_rom - read a PCI ROM
1199 * @filp: sysfs file
1200 * @kobj: kernel object handle
1201 * @bin_attr: struct bin_attribute for this file
1202 * @buf: where to put the data we read from the ROM
1203 * @off: file offset
1204 * @count: number of bytes to read
1205 *
1206 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1207 * device corresponding to @kobj.
1208 */
1209static ssize_t
1210pci_read_rom(struct file *filp, struct kobject *kobj,
1211 struct bin_attribute *bin_attr,
1212 char *buf, loff_t off, size_t count)
1213{
1214 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1215 void __iomem *rom;
1216 size_t size;
1217
1218 if (!pdev->rom_attr_enabled)
1219 return -EINVAL;
1220
1221 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1222 if (!rom || !size)
1223 return -EIO;
1224
1225 if (off >= size)
1226 count = 0;
1227 else {
1228 if (off + count > size)
1229 count = size - off;
1230
1231 memcpy_fromio(buf, rom + off, count);
1232 }
1233 pci_unmap_rom(pdev, rom);
1234
1235 return count;
1236}
1237
1238static struct bin_attribute pci_config_attr = {
1239 .attr = {
1240 .name = "config",
1241 .mode = S_IRUGO | S_IWUSR,
1242 },
1243 .size = PCI_CFG_SPACE_SIZE,
1244 .read = pci_read_config,
1245 .write = pci_write_config,
1246};
1247
1248static struct bin_attribute pcie_config_attr = {
1249 .attr = {
1250 .name = "config",
1251 .mode = S_IRUGO | S_IWUSR,
1252 },
1253 .size = PCI_CFG_SPACE_EXP_SIZE,
1254 .read = pci_read_config,
1255 .write = pci_write_config,
1256};
1257
1258int __weak pcibios_add_platform_entries(struct pci_dev *dev)
1259{
1260 return 0;
1261}
1262
1263static ssize_t reset_store(struct device *dev,
1264 struct device_attribute *attr, const char *buf,
1265 size_t count)
1266{
1267 struct pci_dev *pdev = to_pci_dev(dev);
1268 unsigned long val;
1269 ssize_t result = kstrtoul(buf, 0, &val);
1270
1271 if (result < 0)
1272 return result;
1273
1274 if (val != 1)
1275 return -EINVAL;
1276
1277 result = pci_reset_function(pdev);
1278 if (result < 0)
1279 return result;
1280
1281 return count;
1282}
1283
1284static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1285
1286static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1287{
1288 int retval;
1289 struct bin_attribute *attr;
1290
1291 /* If the device has VPD, try to expose it in sysfs. */
1292 if (dev->vpd) {
1293 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1294 if (!attr)
1295 return -ENOMEM;
1296
1297 sysfs_bin_attr_init(attr);
1298 attr->size = dev->vpd->len;
1299 attr->attr.name = "vpd";
1300 attr->attr.mode = S_IRUSR | S_IWUSR;
1301 attr->read = read_vpd_attr;
1302 attr->write = write_vpd_attr;
1303 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1304 if (retval) {
1305 kfree(attr);
1306 return retval;
1307 }
1308 dev->vpd->attr = attr;
1309 }
1310
1311 /* Active State Power Management */
1312 pcie_aspm_create_sysfs_dev_files(dev);
1313
1314 if (!pci_probe_reset_function(dev)) {
1315 retval = device_create_file(&dev->dev, &reset_attr);
1316 if (retval)
1317 goto error;
1318 dev->reset_fn = 1;
1319 }
1320 return 0;
1321
1322error:
1323 pcie_aspm_remove_sysfs_dev_files(dev);
1324 if (dev->vpd && dev->vpd->attr) {
1325 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1326 kfree(dev->vpd->attr);
1327 }
1328
1329 return retval;
1330}
1331
1332int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1333{
1334 int retval;
1335 int rom_size = 0;
1336 struct bin_attribute *attr;
1337
1338 if (!sysfs_initialized)
1339 return -EACCES;
1340
1341 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1342 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1343 else
1344 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1345 if (retval)
1346 goto err;
1347
1348 retval = pci_create_resource_files(pdev);
1349 if (retval)
1350 goto err_config_file;
1351
1352 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1353 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1354 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1355 rom_size = 0x20000;
1356
1357 /* If the device has a ROM, try to expose it in sysfs. */
1358 if (rom_size) {
1359 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1360 if (!attr) {
1361 retval = -ENOMEM;
1362 goto err_resource_files;
1363 }
1364 sysfs_bin_attr_init(attr);
1365 attr->size = rom_size;
1366 attr->attr.name = "rom";
1367 attr->attr.mode = S_IRUSR | S_IWUSR;
1368 attr->read = pci_read_rom;
1369 attr->write = pci_write_rom;
1370 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1371 if (retval) {
1372 kfree(attr);
1373 goto err_resource_files;
1374 }
1375 pdev->rom_attr = attr;
1376 }
1377
1378 /* add platform-specific attributes */
1379 retval = pcibios_add_platform_entries(pdev);
1380 if (retval)
1381 goto err_rom_file;
1382
1383 /* add sysfs entries for various capabilities */
1384 retval = pci_create_capabilities_sysfs(pdev);
1385 if (retval)
1386 goto err_rom_file;
1387
1388 pci_create_firmware_label_files(pdev);
1389
1390 return 0;
1391
1392err_rom_file:
1393 if (rom_size) {
1394 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1395 kfree(pdev->rom_attr);
1396 pdev->rom_attr = NULL;
1397 }
1398err_resource_files:
1399 pci_remove_resource_files(pdev);
1400err_config_file:
1401 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1402 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1403 else
1404 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1405err:
1406 return retval;
1407}
1408
1409static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1410{
1411 if (dev->vpd && dev->vpd->attr) {
1412 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1413 kfree(dev->vpd->attr);
1414 }
1415
1416 pcie_aspm_remove_sysfs_dev_files(dev);
1417 if (dev->reset_fn) {
1418 device_remove_file(&dev->dev, &reset_attr);
1419 dev->reset_fn = 0;
1420 }
1421}
1422
1423/**
1424 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1425 * @pdev: device whose entries we should free
1426 *
1427 * Cleanup when @pdev is removed from sysfs.
1428 */
1429void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1430{
1431 int rom_size = 0;
1432
1433 if (!sysfs_initialized)
1434 return;
1435
1436 pci_remove_capabilities_sysfs(pdev);
1437
1438 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1439 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1440 else
1441 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1442
1443 pci_remove_resource_files(pdev);
1444
1445 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1446 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1447 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1448 rom_size = 0x20000;
1449
1450 if (rom_size && pdev->rom_attr) {
1451 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1452 kfree(pdev->rom_attr);
1453 }
1454
1455 pci_remove_firmware_label_files(pdev);
1456
1457}
1458
1459static int __init pci_sysfs_init(void)
1460{
1461 struct pci_dev *pdev = NULL;
1462 int retval;
1463
1464 sysfs_initialized = 1;
1465 for_each_pci_dev(pdev) {
1466 retval = pci_create_sysfs_dev_files(pdev);
1467 if (retval) {
1468 pci_dev_put(pdev);
1469 return retval;
1470 }
1471 }
1472
1473 return 0;
1474}
1475
1476late_initcall(pci_sysfs_init);
1477
1478static struct attribute *pci_dev_dev_attrs[] = {
1479 &vga_attr.attr,
1480 NULL,
1481};
1482
1483static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1484 struct attribute *a, int n)
1485{
1486 struct device *dev = container_of(kobj, struct device, kobj);
1487 struct pci_dev *pdev = to_pci_dev(dev);
1488
1489 if (a == &vga_attr.attr)
1490 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1491 return 0;
1492
1493 return a->mode;
1494}
1495
1496static struct attribute *pci_dev_hp_attrs[] = {
1497 &dev_remove_attr.attr,
1498 &dev_rescan_attr.attr,
1499 NULL,
1500};
1501
1502static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1503 struct attribute *a, int n)
1504{
1505 struct device *dev = container_of(kobj, struct device, kobj);
1506 struct pci_dev *pdev = to_pci_dev(dev);
1507
1508 if (pdev->is_virtfn)
1509 return 0;
1510
1511 return a->mode;
1512}
1513
1514static struct attribute_group pci_dev_hp_attr_group = {
1515 .attrs = pci_dev_hp_attrs,
1516 .is_visible = pci_dev_hp_attrs_are_visible,
1517};
1518
1519#ifdef CONFIG_PCI_IOV
1520static struct attribute *sriov_dev_attrs[] = {
1521 &sriov_totalvfs_attr.attr,
1522 &sriov_numvfs_attr.attr,
1523 NULL,
1524};
1525
1526static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1527 struct attribute *a, int n)
1528{
1529 struct device *dev = container_of(kobj, struct device, kobj);
1530
1531 if (!dev_is_pf(dev))
1532 return 0;
1533
1534 return a->mode;
1535}
1536
1537static struct attribute_group sriov_dev_attr_group = {
1538 .attrs = sriov_dev_attrs,
1539 .is_visible = sriov_attrs_are_visible,
1540};
1541#endif /* CONFIG_PCI_IOV */
1542
1543static struct attribute_group pci_dev_attr_group = {
1544 .attrs = pci_dev_dev_attrs,
1545 .is_visible = pci_dev_attrs_are_visible,
1546};
1547
1548static const struct attribute_group *pci_dev_attr_groups[] = {
1549 &pci_dev_attr_group,
1550 &pci_dev_hp_attr_group,
1551#ifdef CONFIG_PCI_IOV
1552 &sriov_dev_attr_group,
1553#endif
1554 NULL,
1555};
1556
1557struct device_type pci_dev_type = {
1558 .groups = pci_dev_attr_groups,
1559};