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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 "pci.h"
32
33static int sysfs_initialized; /* = 0 */
34
35/* show configuration fields */
36#define pci_config_attr(field, format_string) \
37static ssize_t \
38field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
39{ \
40 struct pci_dev *pdev; \
41 \
42 pdev = to_pci_dev (dev); \
43 return sprintf (buf, format_string, pdev->field); \
44}
45
46pci_config_attr(vendor, "0x%04x\n");
47pci_config_attr(device, "0x%04x\n");
48pci_config_attr(subsystem_vendor, "0x%04x\n");
49pci_config_attr(subsystem_device, "0x%04x\n");
50pci_config_attr(class, "0x%06x\n");
51pci_config_attr(irq, "%u\n");
52
53static ssize_t broken_parity_status_show(struct device *dev,
54 struct device_attribute *attr,
55 char *buf)
56{
57 struct pci_dev *pdev = to_pci_dev(dev);
58 return sprintf (buf, "%u\n", pdev->broken_parity_status);
59}
60
61static ssize_t broken_parity_status_store(struct device *dev,
62 struct device_attribute *attr,
63 const char *buf, size_t count)
64{
65 struct pci_dev *pdev = to_pci_dev(dev);
66 unsigned long val;
67
68 if (strict_strtoul(buf, 0, &val) < 0)
69 return -EINVAL;
70
71 pdev->broken_parity_status = !!val;
72
73 return count;
74}
75
76static ssize_t local_cpus_show(struct device *dev,
77 struct device_attribute *attr, char *buf)
78{
79 const struct cpumask *mask;
80 int len;
81
82#ifdef CONFIG_NUMA
83 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
84 cpumask_of_node(dev_to_node(dev));
85#else
86 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
87#endif
88 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
89 buf[len++] = '\n';
90 buf[len] = '\0';
91 return len;
92}
93
94
95static ssize_t local_cpulist_show(struct device *dev,
96 struct device_attribute *attr, char *buf)
97{
98 const struct cpumask *mask;
99 int len;
100
101#ifdef CONFIG_NUMA
102 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
103 cpumask_of_node(dev_to_node(dev));
104#else
105 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
106#endif
107 len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
108 buf[len++] = '\n';
109 buf[len] = '\0';
110 return len;
111}
112
113/*
114 * PCI Bus Class Devices
115 */
116static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
117 int type,
118 struct device_attribute *attr,
119 char *buf)
120{
121 int ret;
122 const struct cpumask *cpumask;
123
124 cpumask = cpumask_of_pcibus(to_pci_bus(dev));
125 ret = type ?
126 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
127 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
128 buf[ret++] = '\n';
129 buf[ret] = '\0';
130 return ret;
131}
132
133static inline ssize_t pci_bus_show_cpumaskaffinity(struct device *dev,
134 struct device_attribute *attr,
135 char *buf)
136{
137 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
138}
139
140static inline ssize_t pci_bus_show_cpulistaffinity(struct device *dev,
141 struct device_attribute *attr,
142 char *buf)
143{
144 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
145}
146
147/* show resources */
148static ssize_t
149resource_show(struct device * dev, struct device_attribute *attr, char * buf)
150{
151 struct pci_dev * pci_dev = to_pci_dev(dev);
152 char * str = buf;
153 int i;
154 int max;
155 resource_size_t start, end;
156
157 if (pci_dev->subordinate)
158 max = DEVICE_COUNT_RESOURCE;
159 else
160 max = PCI_BRIDGE_RESOURCES;
161
162 for (i = 0; i < max; i++) {
163 struct resource *res = &pci_dev->resource[i];
164 pci_resource_to_user(pci_dev, i, res, &start, &end);
165 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
166 (unsigned long long)start,
167 (unsigned long long)end,
168 (unsigned long long)res->flags);
169 }
170 return (str - buf);
171}
172
173static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
174{
175 struct pci_dev *pci_dev = to_pci_dev(dev);
176
177 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
178 pci_dev->vendor, pci_dev->device,
179 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
180 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
181 (u8)(pci_dev->class));
182}
183
184static ssize_t is_enabled_store(struct device *dev,
185 struct device_attribute *attr, const char *buf,
186 size_t count)
187{
188 struct pci_dev *pdev = to_pci_dev(dev);
189 unsigned long val;
190 ssize_t result = strict_strtoul(buf, 0, &val);
191
192 if (result < 0)
193 return result;
194
195 /* this can crash the machine when done on the "wrong" device */
196 if (!capable(CAP_SYS_ADMIN))
197 return -EPERM;
198
199 if (!val) {
200 if (pci_is_enabled(pdev))
201 pci_disable_device(pdev);
202 else
203 result = -EIO;
204 } else
205 result = pci_enable_device(pdev);
206
207 return result < 0 ? result : count;
208}
209
210static ssize_t is_enabled_show(struct device *dev,
211 struct device_attribute *attr, char *buf)
212{
213 struct pci_dev *pdev;
214
215 pdev = to_pci_dev (dev);
216 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
217}
218
219#ifdef CONFIG_NUMA
220static ssize_t
221numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
222{
223 return sprintf (buf, "%d\n", dev->numa_node);
224}
225#endif
226
227static ssize_t
228dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
229{
230 struct pci_dev *pdev = to_pci_dev(dev);
231
232 return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
233}
234
235static ssize_t
236consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
237 char *buf)
238{
239 return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
240}
241
242static ssize_t
243msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
244{
245 struct pci_dev *pdev = to_pci_dev(dev);
246
247 if (!pdev->subordinate)
248 return 0;
249
250 return sprintf (buf, "%u\n",
251 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
252}
253
254static ssize_t
255msi_bus_store(struct device *dev, struct device_attribute *attr,
256 const char *buf, size_t count)
257{
258 struct pci_dev *pdev = to_pci_dev(dev);
259 unsigned long val;
260
261 if (strict_strtoul(buf, 0, &val) < 0)
262 return -EINVAL;
263
264 /* bad things may happen if the no_msi flag is changed
265 * while some drivers are loaded */
266 if (!capable(CAP_SYS_ADMIN))
267 return -EPERM;
268
269 /* Maybe pci devices without subordinate busses shouldn't even have this
270 * attribute in the first place? */
271 if (!pdev->subordinate)
272 return count;
273
274 /* Is the flag going to change, or keep the value it already had? */
275 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
276 !!val) {
277 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
278
279 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
280 " bad things could happen\n", val ? "" : " not");
281 }
282
283 return count;
284}
285
286#ifdef CONFIG_HOTPLUG
287static DEFINE_MUTEX(pci_remove_rescan_mutex);
288static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
289 size_t count)
290{
291 unsigned long val;
292 struct pci_bus *b = NULL;
293
294 if (strict_strtoul(buf, 0, &val) < 0)
295 return -EINVAL;
296
297 if (val) {
298 mutex_lock(&pci_remove_rescan_mutex);
299 while ((b = pci_find_next_bus(b)) != NULL)
300 pci_rescan_bus(b);
301 mutex_unlock(&pci_remove_rescan_mutex);
302 }
303 return count;
304}
305
306struct bus_attribute pci_bus_attrs[] = {
307 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
308 __ATTR_NULL
309};
310
311static ssize_t
312dev_rescan_store(struct device *dev, struct device_attribute *attr,
313 const char *buf, size_t count)
314{
315 unsigned long val;
316 struct pci_dev *pdev = to_pci_dev(dev);
317
318 if (strict_strtoul(buf, 0, &val) < 0)
319 return -EINVAL;
320
321 if (val) {
322 mutex_lock(&pci_remove_rescan_mutex);
323 pci_rescan_bus(pdev->bus);
324 mutex_unlock(&pci_remove_rescan_mutex);
325 }
326 return count;
327}
328
329static void remove_callback(struct device *dev)
330{
331 struct pci_dev *pdev = to_pci_dev(dev);
332
333 mutex_lock(&pci_remove_rescan_mutex);
334 pci_stop_and_remove_bus_device(pdev);
335 mutex_unlock(&pci_remove_rescan_mutex);
336}
337
338static ssize_t
339remove_store(struct device *dev, struct device_attribute *dummy,
340 const char *buf, size_t count)
341{
342 int ret = 0;
343 unsigned long val;
344
345 if (strict_strtoul(buf, 0, &val) < 0)
346 return -EINVAL;
347
348 /* An attribute cannot be unregistered by one of its own methods,
349 * so we have to use this roundabout approach.
350 */
351 if (val)
352 ret = device_schedule_callback(dev, remove_callback);
353 if (ret)
354 count = ret;
355 return count;
356}
357
358static ssize_t
359dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
360 const char *buf, size_t count)
361{
362 unsigned long val;
363 struct pci_bus *bus = to_pci_bus(dev);
364
365 if (strict_strtoul(buf, 0, &val) < 0)
366 return -EINVAL;
367
368 if (val) {
369 mutex_lock(&pci_remove_rescan_mutex);
370 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
371 pci_rescan_bus_bridge_resize(bus->self);
372 else
373 pci_rescan_bus(bus);
374 mutex_unlock(&pci_remove_rescan_mutex);
375 }
376 return count;
377}
378
379#endif
380
381struct device_attribute pci_dev_attrs[] = {
382 __ATTR_RO(resource),
383 __ATTR_RO(vendor),
384 __ATTR_RO(device),
385 __ATTR_RO(subsystem_vendor),
386 __ATTR_RO(subsystem_device),
387 __ATTR_RO(class),
388 __ATTR_RO(irq),
389 __ATTR_RO(local_cpus),
390 __ATTR_RO(local_cpulist),
391 __ATTR_RO(modalias),
392#ifdef CONFIG_NUMA
393 __ATTR_RO(numa_node),
394#endif
395 __ATTR_RO(dma_mask_bits),
396 __ATTR_RO(consistent_dma_mask_bits),
397 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
398 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
399 broken_parity_status_show,broken_parity_status_store),
400 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
401#ifdef CONFIG_HOTPLUG
402 __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
403 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
404#endif
405 __ATTR_NULL,
406};
407
408struct device_attribute pcibus_dev_attrs[] = {
409#ifdef CONFIG_HOTPLUG
410 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store),
411#endif
412 __ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL),
413 __ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL),
414 __ATTR_NULL,
415};
416
417static ssize_t
418boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
419{
420 struct pci_dev *pdev = to_pci_dev(dev);
421 struct pci_dev *vga_dev = vga_default_device();
422
423 if (vga_dev)
424 return sprintf(buf, "%u\n", (pdev == vga_dev));
425
426 return sprintf(buf, "%u\n",
427 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
428 IORESOURCE_ROM_SHADOW));
429}
430struct device_attribute vga_attr = __ATTR_RO(boot_vga);
431
432static ssize_t
433pci_read_config(struct file *filp, struct kobject *kobj,
434 struct bin_attribute *bin_attr,
435 char *buf, loff_t off, size_t count)
436{
437 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
438 unsigned int size = 64;
439 loff_t init_off = off;
440 u8 *data = (u8*) buf;
441
442 /* Several chips lock up trying to read undefined config space */
443 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
444 size = dev->cfg_size;
445 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
446 size = 128;
447 }
448
449 if (off > size)
450 return 0;
451 if (off + count > size) {
452 size -= off;
453 count = size;
454 } else {
455 size = count;
456 }
457
458 if ((off & 1) && size) {
459 u8 val;
460 pci_user_read_config_byte(dev, off, &val);
461 data[off - init_off] = val;
462 off++;
463 size--;
464 }
465
466 if ((off & 3) && size > 2) {
467 u16 val;
468 pci_user_read_config_word(dev, off, &val);
469 data[off - init_off] = val & 0xff;
470 data[off - init_off + 1] = (val >> 8) & 0xff;
471 off += 2;
472 size -= 2;
473 }
474
475 while (size > 3) {
476 u32 val;
477 pci_user_read_config_dword(dev, off, &val);
478 data[off - init_off] = val & 0xff;
479 data[off - init_off + 1] = (val >> 8) & 0xff;
480 data[off - init_off + 2] = (val >> 16) & 0xff;
481 data[off - init_off + 3] = (val >> 24) & 0xff;
482 off += 4;
483 size -= 4;
484 }
485
486 if (size >= 2) {
487 u16 val;
488 pci_user_read_config_word(dev, off, &val);
489 data[off - init_off] = val & 0xff;
490 data[off - init_off + 1] = (val >> 8) & 0xff;
491 off += 2;
492 size -= 2;
493 }
494
495 if (size > 0) {
496 u8 val;
497 pci_user_read_config_byte(dev, off, &val);
498 data[off - init_off] = val;
499 off++;
500 --size;
501 }
502
503 return count;
504}
505
506static ssize_t
507pci_write_config(struct file* filp, struct kobject *kobj,
508 struct bin_attribute *bin_attr,
509 char *buf, loff_t off, size_t count)
510{
511 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
512 unsigned int size = count;
513 loff_t init_off = off;
514 u8 *data = (u8*) buf;
515
516 if (off > dev->cfg_size)
517 return 0;
518 if (off + count > dev->cfg_size) {
519 size = dev->cfg_size - off;
520 count = size;
521 }
522
523 if ((off & 1) && size) {
524 pci_user_write_config_byte(dev, off, data[off - init_off]);
525 off++;
526 size--;
527 }
528
529 if ((off & 3) && size > 2) {
530 u16 val = data[off - init_off];
531 val |= (u16) data[off - init_off + 1] << 8;
532 pci_user_write_config_word(dev, off, val);
533 off += 2;
534 size -= 2;
535 }
536
537 while (size > 3) {
538 u32 val = data[off - init_off];
539 val |= (u32) data[off - init_off + 1] << 8;
540 val |= (u32) data[off - init_off + 2] << 16;
541 val |= (u32) data[off - init_off + 3] << 24;
542 pci_user_write_config_dword(dev, off, val);
543 off += 4;
544 size -= 4;
545 }
546
547 if (size >= 2) {
548 u16 val = data[off - init_off];
549 val |= (u16) data[off - init_off + 1] << 8;
550 pci_user_write_config_word(dev, off, val);
551 off += 2;
552 size -= 2;
553 }
554
555 if (size) {
556 pci_user_write_config_byte(dev, off, data[off - init_off]);
557 off++;
558 --size;
559 }
560
561 return count;
562}
563
564static ssize_t
565read_vpd_attr(struct file *filp, struct kobject *kobj,
566 struct bin_attribute *bin_attr,
567 char *buf, loff_t off, size_t count)
568{
569 struct pci_dev *dev =
570 to_pci_dev(container_of(kobj, struct device, kobj));
571
572 if (off > bin_attr->size)
573 count = 0;
574 else if (count > bin_attr->size - off)
575 count = bin_attr->size - off;
576
577 return pci_read_vpd(dev, off, count, buf);
578}
579
580static ssize_t
581write_vpd_attr(struct file *filp, struct kobject *kobj,
582 struct bin_attribute *bin_attr,
583 char *buf, loff_t off, size_t count)
584{
585 struct pci_dev *dev =
586 to_pci_dev(container_of(kobj, struct device, kobj));
587
588 if (off > bin_attr->size)
589 count = 0;
590 else if (count > bin_attr->size - off)
591 count = bin_attr->size - off;
592
593 return pci_write_vpd(dev, off, count, buf);
594}
595
596#ifdef HAVE_PCI_LEGACY
597/**
598 * pci_read_legacy_io - read byte(s) from legacy I/O port space
599 * @filp: open sysfs file
600 * @kobj: kobject corresponding to file to read from
601 * @bin_attr: struct bin_attribute for this file
602 * @buf: buffer to store results
603 * @off: offset into legacy I/O port space
604 * @count: number of bytes to read
605 *
606 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
607 * callback routine (pci_legacy_read).
608 */
609static ssize_t
610pci_read_legacy_io(struct file *filp, struct kobject *kobj,
611 struct bin_attribute *bin_attr,
612 char *buf, loff_t off, size_t count)
613{
614 struct pci_bus *bus = to_pci_bus(container_of(kobj,
615 struct device,
616 kobj));
617
618 /* Only support 1, 2 or 4 byte accesses */
619 if (count != 1 && count != 2 && count != 4)
620 return -EINVAL;
621
622 return pci_legacy_read(bus, off, (u32 *)buf, count);
623}
624
625/**
626 * pci_write_legacy_io - write byte(s) to legacy I/O port space
627 * @filp: open sysfs file
628 * @kobj: kobject corresponding to file to read from
629 * @bin_attr: struct bin_attribute for this file
630 * @buf: buffer containing value to be written
631 * @off: offset into legacy I/O port space
632 * @count: number of bytes to write
633 *
634 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
635 * callback routine (pci_legacy_write).
636 */
637static ssize_t
638pci_write_legacy_io(struct file *filp, struct kobject *kobj,
639 struct bin_attribute *bin_attr,
640 char *buf, loff_t off, size_t count)
641{
642 struct pci_bus *bus = to_pci_bus(container_of(kobj,
643 struct device,
644 kobj));
645 /* Only support 1, 2 or 4 byte accesses */
646 if (count != 1 && count != 2 && count != 4)
647 return -EINVAL;
648
649 return pci_legacy_write(bus, off, *(u32 *)buf, count);
650}
651
652/**
653 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
654 * @filp: open sysfs file
655 * @kobj: kobject corresponding to device to be mapped
656 * @attr: struct bin_attribute for this file
657 * @vma: struct vm_area_struct passed to mmap
658 *
659 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
660 * legacy memory space (first meg of bus space) into application virtual
661 * memory space.
662 */
663static int
664pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
665 struct bin_attribute *attr,
666 struct vm_area_struct *vma)
667{
668 struct pci_bus *bus = to_pci_bus(container_of(kobj,
669 struct device,
670 kobj));
671
672 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
673}
674
675/**
676 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
677 * @filp: open sysfs file
678 * @kobj: kobject corresponding to device to be mapped
679 * @attr: struct bin_attribute for this file
680 * @vma: struct vm_area_struct passed to mmap
681 *
682 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
683 * legacy IO space (first meg of bus space) into application virtual
684 * memory space. Returns -ENOSYS if the operation isn't supported
685 */
686static int
687pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
688 struct bin_attribute *attr,
689 struct vm_area_struct *vma)
690{
691 struct pci_bus *bus = to_pci_bus(container_of(kobj,
692 struct device,
693 kobj));
694
695 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
696}
697
698/**
699 * pci_adjust_legacy_attr - adjustment of legacy file attributes
700 * @b: bus to create files under
701 * @mmap_type: I/O port or memory
702 *
703 * Stub implementation. Can be overridden by arch if necessary.
704 */
705void __weak
706pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
707{
708 return;
709}
710
711/**
712 * pci_create_legacy_files - create legacy I/O port and memory files
713 * @b: bus to create files under
714 *
715 * Some platforms allow access to legacy I/O port and ISA memory space on
716 * a per-bus basis. This routine creates the files and ties them into
717 * their associated read, write and mmap files from pci-sysfs.c
718 *
719 * On error unwind, but don't propagate the error to the caller
720 * as it is ok to set up the PCI bus without these files.
721 */
722void pci_create_legacy_files(struct pci_bus *b)
723{
724 int error;
725
726 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
727 GFP_ATOMIC);
728 if (!b->legacy_io)
729 goto kzalloc_err;
730
731 sysfs_bin_attr_init(b->legacy_io);
732 b->legacy_io->attr.name = "legacy_io";
733 b->legacy_io->size = 0xffff;
734 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
735 b->legacy_io->read = pci_read_legacy_io;
736 b->legacy_io->write = pci_write_legacy_io;
737 b->legacy_io->mmap = pci_mmap_legacy_io;
738 pci_adjust_legacy_attr(b, pci_mmap_io);
739 error = device_create_bin_file(&b->dev, b->legacy_io);
740 if (error)
741 goto legacy_io_err;
742
743 /* Allocated above after the legacy_io struct */
744 b->legacy_mem = b->legacy_io + 1;
745 sysfs_bin_attr_init(b->legacy_mem);
746 b->legacy_mem->attr.name = "legacy_mem";
747 b->legacy_mem->size = 1024*1024;
748 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
749 b->legacy_mem->mmap = pci_mmap_legacy_mem;
750 pci_adjust_legacy_attr(b, pci_mmap_mem);
751 error = device_create_bin_file(&b->dev, b->legacy_mem);
752 if (error)
753 goto legacy_mem_err;
754
755 return;
756
757legacy_mem_err:
758 device_remove_bin_file(&b->dev, b->legacy_io);
759legacy_io_err:
760 kfree(b->legacy_io);
761 b->legacy_io = NULL;
762kzalloc_err:
763 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
764 "and ISA memory resources to sysfs\n");
765 return;
766}
767
768void pci_remove_legacy_files(struct pci_bus *b)
769{
770 if (b->legacy_io) {
771 device_remove_bin_file(&b->dev, b->legacy_io);
772 device_remove_bin_file(&b->dev, b->legacy_mem);
773 kfree(b->legacy_io); /* both are allocated here */
774 }
775}
776#endif /* HAVE_PCI_LEGACY */
777
778#ifdef HAVE_PCI_MMAP
779
780int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
781 enum pci_mmap_api mmap_api)
782{
783 unsigned long nr, start, size, pci_start;
784
785 if (pci_resource_len(pdev, resno) == 0)
786 return 0;
787 nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
788 start = vma->vm_pgoff;
789 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
790 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
791 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
792 if (start >= pci_start && start < pci_start + size &&
793 start + nr <= pci_start + size)
794 return 1;
795 return 0;
796}
797
798/**
799 * pci_mmap_resource - map a PCI resource into user memory space
800 * @kobj: kobject for mapping
801 * @attr: struct bin_attribute for the file being mapped
802 * @vma: struct vm_area_struct passed into the mmap
803 * @write_combine: 1 for write_combine mapping
804 *
805 * Use the regular PCI mapping routines to map a PCI resource into userspace.
806 */
807static int
808pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
809 struct vm_area_struct *vma, int write_combine)
810{
811 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
812 struct device, kobj));
813 struct resource *res = attr->private;
814 enum pci_mmap_state mmap_type;
815 resource_size_t start, end;
816 int i;
817
818 for (i = 0; i < PCI_ROM_RESOURCE; i++)
819 if (res == &pdev->resource[i])
820 break;
821 if (i >= PCI_ROM_RESOURCE)
822 return -ENODEV;
823
824 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
825 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
826 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
827 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
828 pci_name(pdev), i,
829 (u64)pci_resource_start(pdev, i),
830 (u64)pci_resource_len(pdev, i));
831 return -EINVAL;
832 }
833
834 /* pci_mmap_page_range() expects the same kind of entry as coming
835 * from /proc/bus/pci/ which is a "user visible" value. If this is
836 * different from the resource itself, arch will do necessary fixup.
837 */
838 pci_resource_to_user(pdev, i, res, &start, &end);
839 vma->vm_pgoff += start >> PAGE_SHIFT;
840 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
841
842 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
843 return -EINVAL;
844
845 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
846}
847
848static int
849pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
850 struct bin_attribute *attr,
851 struct vm_area_struct *vma)
852{
853 return pci_mmap_resource(kobj, attr, vma, 0);
854}
855
856static int
857pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
858 struct bin_attribute *attr,
859 struct vm_area_struct *vma)
860{
861 return pci_mmap_resource(kobj, attr, vma, 1);
862}
863
864static ssize_t
865pci_resource_io(struct file *filp, struct kobject *kobj,
866 struct bin_attribute *attr, char *buf,
867 loff_t off, size_t count, bool write)
868{
869 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
870 struct device, kobj));
871 struct resource *res = attr->private;
872 unsigned long port = off;
873 int i;
874
875 for (i = 0; i < PCI_ROM_RESOURCE; i++)
876 if (res == &pdev->resource[i])
877 break;
878 if (i >= PCI_ROM_RESOURCE)
879 return -ENODEV;
880
881 port += pci_resource_start(pdev, i);
882
883 if (port > pci_resource_end(pdev, i))
884 return 0;
885
886 if (port + count - 1 > pci_resource_end(pdev, i))
887 return -EINVAL;
888
889 switch (count) {
890 case 1:
891 if (write)
892 outb(*(u8 *)buf, port);
893 else
894 *(u8 *)buf = inb(port);
895 return 1;
896 case 2:
897 if (write)
898 outw(*(u16 *)buf, port);
899 else
900 *(u16 *)buf = inw(port);
901 return 2;
902 case 4:
903 if (write)
904 outl(*(u32 *)buf, port);
905 else
906 *(u32 *)buf = inl(port);
907 return 4;
908 }
909 return -EINVAL;
910}
911
912static ssize_t
913pci_read_resource_io(struct file *filp, struct kobject *kobj,
914 struct bin_attribute *attr, char *buf,
915 loff_t off, size_t count)
916{
917 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
918}
919
920static ssize_t
921pci_write_resource_io(struct file *filp, struct kobject *kobj,
922 struct bin_attribute *attr, char *buf,
923 loff_t off, size_t count)
924{
925 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
926}
927
928/**
929 * pci_remove_resource_files - cleanup resource files
930 * @pdev: dev to cleanup
931 *
932 * If we created resource files for @pdev, remove them from sysfs and
933 * free their resources.
934 */
935static void
936pci_remove_resource_files(struct pci_dev *pdev)
937{
938 int i;
939
940 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
941 struct bin_attribute *res_attr;
942
943 res_attr = pdev->res_attr[i];
944 if (res_attr) {
945 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
946 kfree(res_attr);
947 }
948
949 res_attr = pdev->res_attr_wc[i];
950 if (res_attr) {
951 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
952 kfree(res_attr);
953 }
954 }
955}
956
957static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
958{
959 /* allocate attribute structure, piggyback attribute name */
960 int name_len = write_combine ? 13 : 10;
961 struct bin_attribute *res_attr;
962 int retval;
963
964 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
965 if (res_attr) {
966 char *res_attr_name = (char *)(res_attr + 1);
967
968 sysfs_bin_attr_init(res_attr);
969 if (write_combine) {
970 pdev->res_attr_wc[num] = res_attr;
971 sprintf(res_attr_name, "resource%d_wc", num);
972 res_attr->mmap = pci_mmap_resource_wc;
973 } else {
974 pdev->res_attr[num] = res_attr;
975 sprintf(res_attr_name, "resource%d", num);
976 res_attr->mmap = pci_mmap_resource_uc;
977 }
978 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
979 res_attr->read = pci_read_resource_io;
980 res_attr->write = pci_write_resource_io;
981 }
982 res_attr->attr.name = res_attr_name;
983 res_attr->attr.mode = S_IRUSR | S_IWUSR;
984 res_attr->size = pci_resource_len(pdev, num);
985 res_attr->private = &pdev->resource[num];
986 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
987 } else
988 retval = -ENOMEM;
989
990 return retval;
991}
992
993/**
994 * pci_create_resource_files - create resource files in sysfs for @dev
995 * @pdev: dev in question
996 *
997 * Walk the resources in @pdev creating files for each resource available.
998 */
999static int pci_create_resource_files(struct pci_dev *pdev)
1000{
1001 int i;
1002 int retval;
1003
1004 /* Expose the PCI resources from this device as files */
1005 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1006
1007 /* skip empty resources */
1008 if (!pci_resource_len(pdev, i))
1009 continue;
1010
1011 retval = pci_create_attr(pdev, i, 0);
1012 /* for prefetchable resources, create a WC mappable file */
1013 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1014 retval = pci_create_attr(pdev, i, 1);
1015
1016 if (retval) {
1017 pci_remove_resource_files(pdev);
1018 return retval;
1019 }
1020 }
1021 return 0;
1022}
1023#else /* !HAVE_PCI_MMAP */
1024int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1025void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1026#endif /* HAVE_PCI_MMAP */
1027
1028/**
1029 * pci_write_rom - used to enable access to the PCI ROM display
1030 * @filp: sysfs file
1031 * @kobj: kernel object handle
1032 * @bin_attr: struct bin_attribute for this file
1033 * @buf: user input
1034 * @off: file offset
1035 * @count: number of byte in input
1036 *
1037 * writing anything except 0 enables it
1038 */
1039static ssize_t
1040pci_write_rom(struct file *filp, struct kobject *kobj,
1041 struct bin_attribute *bin_attr,
1042 char *buf, loff_t off, size_t count)
1043{
1044 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1045
1046 if ((off == 0) && (*buf == '0') && (count == 2))
1047 pdev->rom_attr_enabled = 0;
1048 else
1049 pdev->rom_attr_enabled = 1;
1050
1051 return count;
1052}
1053
1054/**
1055 * pci_read_rom - read a PCI ROM
1056 * @filp: sysfs file
1057 * @kobj: kernel object handle
1058 * @bin_attr: struct bin_attribute for this file
1059 * @buf: where to put the data we read from the ROM
1060 * @off: file offset
1061 * @count: number of bytes to read
1062 *
1063 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1064 * device corresponding to @kobj.
1065 */
1066static ssize_t
1067pci_read_rom(struct file *filp, struct kobject *kobj,
1068 struct bin_attribute *bin_attr,
1069 char *buf, loff_t off, size_t count)
1070{
1071 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1072 void __iomem *rom;
1073 size_t size;
1074
1075 if (!pdev->rom_attr_enabled)
1076 return -EINVAL;
1077
1078 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1079 if (!rom || !size)
1080 return -EIO;
1081
1082 if (off >= size)
1083 count = 0;
1084 else {
1085 if (off + count > size)
1086 count = size - off;
1087
1088 memcpy_fromio(buf, rom + off, count);
1089 }
1090 pci_unmap_rom(pdev, rom);
1091
1092 return count;
1093}
1094
1095static struct bin_attribute pci_config_attr = {
1096 .attr = {
1097 .name = "config",
1098 .mode = S_IRUGO | S_IWUSR,
1099 },
1100 .size = PCI_CFG_SPACE_SIZE,
1101 .read = pci_read_config,
1102 .write = pci_write_config,
1103};
1104
1105static struct bin_attribute pcie_config_attr = {
1106 .attr = {
1107 .name = "config",
1108 .mode = S_IRUGO | S_IWUSR,
1109 },
1110 .size = PCI_CFG_SPACE_EXP_SIZE,
1111 .read = pci_read_config,
1112 .write = pci_write_config,
1113};
1114
1115int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
1116{
1117 return 0;
1118}
1119
1120static ssize_t reset_store(struct device *dev,
1121 struct device_attribute *attr, const char *buf,
1122 size_t count)
1123{
1124 struct pci_dev *pdev = to_pci_dev(dev);
1125 unsigned long val;
1126 ssize_t result = strict_strtoul(buf, 0, &val);
1127
1128 if (result < 0)
1129 return result;
1130
1131 if (val != 1)
1132 return -EINVAL;
1133
1134 result = pci_reset_function(pdev);
1135 if (result < 0)
1136 return result;
1137
1138 return count;
1139}
1140
1141static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1142
1143static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1144{
1145 int retval;
1146 struct bin_attribute *attr;
1147
1148 /* If the device has VPD, try to expose it in sysfs. */
1149 if (dev->vpd) {
1150 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1151 if (!attr)
1152 return -ENOMEM;
1153
1154 sysfs_bin_attr_init(attr);
1155 attr->size = dev->vpd->len;
1156 attr->attr.name = "vpd";
1157 attr->attr.mode = S_IRUSR | S_IWUSR;
1158 attr->read = read_vpd_attr;
1159 attr->write = write_vpd_attr;
1160 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1161 if (retval) {
1162 kfree(attr);
1163 return retval;
1164 }
1165 dev->vpd->attr = attr;
1166 }
1167
1168 /* Active State Power Management */
1169 pcie_aspm_create_sysfs_dev_files(dev);
1170
1171 if (!pci_probe_reset_function(dev)) {
1172 retval = device_create_file(&dev->dev, &reset_attr);
1173 if (retval)
1174 goto error;
1175 dev->reset_fn = 1;
1176 }
1177 return 0;
1178
1179error:
1180 pcie_aspm_remove_sysfs_dev_files(dev);
1181 if (dev->vpd && dev->vpd->attr) {
1182 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1183 kfree(dev->vpd->attr);
1184 }
1185
1186 return retval;
1187}
1188
1189int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1190{
1191 int retval;
1192 int rom_size = 0;
1193 struct bin_attribute *attr;
1194
1195 if (!sysfs_initialized)
1196 return -EACCES;
1197
1198 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1199 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1200 else
1201 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1202 if (retval)
1203 goto err;
1204
1205 retval = pci_create_resource_files(pdev);
1206 if (retval)
1207 goto err_config_file;
1208
1209 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1210 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1211 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1212 rom_size = 0x20000;
1213
1214 /* If the device has a ROM, try to expose it in sysfs. */
1215 if (rom_size) {
1216 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1217 if (!attr) {
1218 retval = -ENOMEM;
1219 goto err_resource_files;
1220 }
1221 sysfs_bin_attr_init(attr);
1222 attr->size = rom_size;
1223 attr->attr.name = "rom";
1224 attr->attr.mode = S_IRUSR | S_IWUSR;
1225 attr->read = pci_read_rom;
1226 attr->write = pci_write_rom;
1227 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1228 if (retval) {
1229 kfree(attr);
1230 goto err_resource_files;
1231 }
1232 pdev->rom_attr = attr;
1233 }
1234
1235 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1236 retval = device_create_file(&pdev->dev, &vga_attr);
1237 if (retval)
1238 goto err_rom_file;
1239 }
1240
1241 /* add platform-specific attributes */
1242 retval = pcibios_add_platform_entries(pdev);
1243 if (retval)
1244 goto err_vga_file;
1245
1246 /* add sysfs entries for various capabilities */
1247 retval = pci_create_capabilities_sysfs(pdev);
1248 if (retval)
1249 goto err_vga_file;
1250
1251 pci_create_firmware_label_files(pdev);
1252
1253 return 0;
1254
1255err_vga_file:
1256 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1257 device_remove_file(&pdev->dev, &vga_attr);
1258err_rom_file:
1259 if (rom_size) {
1260 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1261 kfree(pdev->rom_attr);
1262 pdev->rom_attr = NULL;
1263 }
1264err_resource_files:
1265 pci_remove_resource_files(pdev);
1266err_config_file:
1267 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1268 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1269 else
1270 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1271err:
1272 return retval;
1273}
1274
1275static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1276{
1277 if (dev->vpd && dev->vpd->attr) {
1278 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1279 kfree(dev->vpd->attr);
1280 }
1281
1282 pcie_aspm_remove_sysfs_dev_files(dev);
1283 if (dev->reset_fn) {
1284 device_remove_file(&dev->dev, &reset_attr);
1285 dev->reset_fn = 0;
1286 }
1287}
1288
1289/**
1290 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1291 * @pdev: device whose entries we should free
1292 *
1293 * Cleanup when @pdev is removed from sysfs.
1294 */
1295void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1296{
1297 int rom_size = 0;
1298
1299 if (!sysfs_initialized)
1300 return;
1301
1302 pci_remove_capabilities_sysfs(pdev);
1303
1304 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1305 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1306 else
1307 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1308
1309 pci_remove_resource_files(pdev);
1310
1311 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1312 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1313 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1314 rom_size = 0x20000;
1315
1316 if (rom_size && pdev->rom_attr) {
1317 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1318 kfree(pdev->rom_attr);
1319 }
1320
1321 pci_remove_firmware_label_files(pdev);
1322
1323}
1324
1325static int __init pci_sysfs_init(void)
1326{
1327 struct pci_dev *pdev = NULL;
1328 int retval;
1329
1330 sysfs_initialized = 1;
1331 for_each_pci_dev(pdev) {
1332 retval = pci_create_sysfs_dev_files(pdev);
1333 if (retval) {
1334 pci_dev_put(pdev);
1335 return retval;
1336 }
1337 }
1338
1339 return 0;
1340}
1341
1342late_initcall(pci_sysfs_init);
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 <linux/of.h>
33#include "pci.h"
34
35static int sysfs_initialized; /* = 0 */
36
37/* show configuration fields */
38#define pci_config_attr(field, format_string) \
39static ssize_t \
40field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
41{ \
42 struct pci_dev *pdev; \
43 \
44 pdev = to_pci_dev(dev); \
45 return sprintf(buf, format_string, pdev->field); \
46} \
47static DEVICE_ATTR_RO(field)
48
49pci_config_attr(vendor, "0x%04x\n");
50pci_config_attr(device, "0x%04x\n");
51pci_config_attr(subsystem_vendor, "0x%04x\n");
52pci_config_attr(subsystem_device, "0x%04x\n");
53pci_config_attr(revision, "0x%02x\n");
54pci_config_attr(class, "0x%06x\n");
55pci_config_attr(irq, "%u\n");
56
57static ssize_t broken_parity_status_show(struct device *dev,
58 struct device_attribute *attr,
59 char *buf)
60{
61 struct pci_dev *pdev = to_pci_dev(dev);
62 return sprintf(buf, "%u\n", pdev->broken_parity_status);
63}
64
65static ssize_t broken_parity_status_store(struct device *dev,
66 struct device_attribute *attr,
67 const char *buf, size_t count)
68{
69 struct pci_dev *pdev = to_pci_dev(dev);
70 unsigned long val;
71
72 if (kstrtoul(buf, 0, &val) < 0)
73 return -EINVAL;
74
75 pdev->broken_parity_status = !!val;
76
77 return count;
78}
79static DEVICE_ATTR_RW(broken_parity_status);
80
81static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
82 struct device_attribute *attr, char *buf)
83{
84 const struct cpumask *mask;
85
86#ifdef CONFIG_NUMA
87 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
88 cpumask_of_node(dev_to_node(dev));
89#else
90 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
91#endif
92 return cpumap_print_to_pagebuf(list, buf, mask);
93}
94
95static ssize_t local_cpus_show(struct device *dev,
96 struct device_attribute *attr, char *buf)
97{
98 return pci_dev_show_local_cpu(dev, false, attr, buf);
99}
100static DEVICE_ATTR_RO(local_cpus);
101
102static ssize_t local_cpulist_show(struct device *dev,
103 struct device_attribute *attr, char *buf)
104{
105 return pci_dev_show_local_cpu(dev, true, attr, buf);
106}
107static DEVICE_ATTR_RO(local_cpulist);
108
109/*
110 * PCI Bus Class Devices
111 */
112static ssize_t cpuaffinity_show(struct device *dev,
113 struct device_attribute *attr, char *buf)
114{
115 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
116
117 return cpumap_print_to_pagebuf(false, buf, cpumask);
118}
119static DEVICE_ATTR_RO(cpuaffinity);
120
121static ssize_t cpulistaffinity_show(struct device *dev,
122 struct device_attribute *attr, char *buf)
123{
124 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
125
126 return cpumap_print_to_pagebuf(true, buf, cpumask);
127}
128static DEVICE_ATTR_RO(cpulistaffinity);
129
130/* show resources */
131static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
132 char *buf)
133{
134 struct pci_dev *pci_dev = to_pci_dev(dev);
135 char *str = buf;
136 int i;
137 int max;
138 resource_size_t start, end;
139
140 if (pci_dev->subordinate)
141 max = DEVICE_COUNT_RESOURCE;
142 else
143 max = PCI_BRIDGE_RESOURCES;
144
145 for (i = 0; i < max; i++) {
146 struct resource *res = &pci_dev->resource[i];
147 pci_resource_to_user(pci_dev, i, res, &start, &end);
148 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
149 (unsigned long long)start,
150 (unsigned long long)end,
151 (unsigned long long)res->flags);
152 }
153 return (str - buf);
154}
155static DEVICE_ATTR_RO(resource);
156
157static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
158 char *buf)
159{
160 struct pci_dev *pci_dev = to_pci_dev(dev);
161
162 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
163 pci_dev->vendor, pci_dev->device,
164 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
165 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
166 (u8)(pci_dev->class));
167}
168static DEVICE_ATTR_RO(modalias);
169
170static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
171 const char *buf, size_t count)
172{
173 struct pci_dev *pdev = to_pci_dev(dev);
174 unsigned long val;
175 ssize_t result = kstrtoul(buf, 0, &val);
176
177 if (result < 0)
178 return result;
179
180 /* this can crash the machine when done on the "wrong" device */
181 if (!capable(CAP_SYS_ADMIN))
182 return -EPERM;
183
184 if (!val) {
185 if (pci_is_enabled(pdev))
186 pci_disable_device(pdev);
187 else
188 result = -EIO;
189 } else
190 result = pci_enable_device(pdev);
191
192 return result < 0 ? result : count;
193}
194
195static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
196 char *buf)
197{
198 struct pci_dev *pdev;
199
200 pdev = to_pci_dev(dev);
201 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
202}
203static DEVICE_ATTR_RW(enable);
204
205#ifdef CONFIG_NUMA
206static ssize_t numa_node_store(struct device *dev,
207 struct device_attribute *attr, const char *buf,
208 size_t count)
209{
210 struct pci_dev *pdev = to_pci_dev(dev);
211 int node, ret;
212
213 if (!capable(CAP_SYS_ADMIN))
214 return -EPERM;
215
216 ret = kstrtoint(buf, 0, &node);
217 if (ret)
218 return ret;
219
220 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
221 return -EINVAL;
222
223 if (node != NUMA_NO_NODE && !node_online(node))
224 return -EINVAL;
225
226 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
227 dev_alert(&pdev->dev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
228 node);
229
230 dev->numa_node = node;
231 return count;
232}
233
234static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
235 char *buf)
236{
237 return sprintf(buf, "%d\n", dev->numa_node);
238}
239static DEVICE_ATTR_RW(numa_node);
240#endif
241
242static ssize_t dma_mask_bits_show(struct device *dev,
243 struct device_attribute *attr, char *buf)
244{
245 struct pci_dev *pdev = to_pci_dev(dev);
246
247 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
248}
249static DEVICE_ATTR_RO(dma_mask_bits);
250
251static ssize_t consistent_dma_mask_bits_show(struct device *dev,
252 struct device_attribute *attr,
253 char *buf)
254{
255 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
256}
257static DEVICE_ATTR_RO(consistent_dma_mask_bits);
258
259static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
260 char *buf)
261{
262 struct pci_dev *pdev = to_pci_dev(dev);
263 struct pci_bus *subordinate = pdev->subordinate;
264
265 return sprintf(buf, "%u\n", subordinate ?
266 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
267 : !pdev->no_msi);
268}
269
270static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
271 const char *buf, size_t count)
272{
273 struct pci_dev *pdev = to_pci_dev(dev);
274 struct pci_bus *subordinate = pdev->subordinate;
275 unsigned long val;
276
277 if (kstrtoul(buf, 0, &val) < 0)
278 return -EINVAL;
279
280 if (!capable(CAP_SYS_ADMIN))
281 return -EPERM;
282
283 /*
284 * "no_msi" and "bus_flags" only affect what happens when a driver
285 * requests MSI or MSI-X. They don't affect any drivers that have
286 * already requested MSI or MSI-X.
287 */
288 if (!subordinate) {
289 pdev->no_msi = !val;
290 dev_info(&pdev->dev, "MSI/MSI-X %s for future drivers\n",
291 val ? "allowed" : "disallowed");
292 return count;
293 }
294
295 if (val)
296 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
297 else
298 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
299
300 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
301 val ? "allowed" : "disallowed");
302 return count;
303}
304static DEVICE_ATTR_RW(msi_bus);
305
306static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
307 size_t count)
308{
309 unsigned long val;
310 struct pci_bus *b = NULL;
311
312 if (kstrtoul(buf, 0, &val) < 0)
313 return -EINVAL;
314
315 if (val) {
316 pci_lock_rescan_remove();
317 while ((b = pci_find_next_bus(b)) != NULL)
318 pci_rescan_bus(b);
319 pci_unlock_rescan_remove();
320 }
321 return count;
322}
323static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
324
325static struct attribute *pci_bus_attrs[] = {
326 &bus_attr_rescan.attr,
327 NULL,
328};
329
330static const struct attribute_group pci_bus_group = {
331 .attrs = pci_bus_attrs,
332};
333
334const struct attribute_group *pci_bus_groups[] = {
335 &pci_bus_group,
336 NULL,
337};
338
339static ssize_t dev_rescan_store(struct device *dev,
340 struct device_attribute *attr, const char *buf,
341 size_t count)
342{
343 unsigned long val;
344 struct pci_dev *pdev = to_pci_dev(dev);
345
346 if (kstrtoul(buf, 0, &val) < 0)
347 return -EINVAL;
348
349 if (val) {
350 pci_lock_rescan_remove();
351 pci_rescan_bus(pdev->bus);
352 pci_unlock_rescan_remove();
353 }
354 return count;
355}
356static struct device_attribute dev_rescan_attr = __ATTR(rescan,
357 (S_IWUSR|S_IWGRP),
358 NULL, dev_rescan_store);
359
360static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
361 const char *buf, size_t count)
362{
363 unsigned long val;
364
365 if (kstrtoul(buf, 0, &val) < 0)
366 return -EINVAL;
367
368 if (val && device_remove_file_self(dev, attr))
369 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
370 return count;
371}
372static struct device_attribute dev_remove_attr = __ATTR(remove,
373 (S_IWUSR|S_IWGRP),
374 NULL, remove_store);
375
376static ssize_t dev_bus_rescan_store(struct device *dev,
377 struct device_attribute *attr,
378 const char *buf, size_t count)
379{
380 unsigned long val;
381 struct pci_bus *bus = to_pci_bus(dev);
382
383 if (kstrtoul(buf, 0, &val) < 0)
384 return -EINVAL;
385
386 if (val) {
387 pci_lock_rescan_remove();
388 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
389 pci_rescan_bus_bridge_resize(bus->self);
390 else
391 pci_rescan_bus(bus);
392 pci_unlock_rescan_remove();
393 }
394 return count;
395}
396static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
397
398#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
399static ssize_t d3cold_allowed_store(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf, size_t count)
402{
403 struct pci_dev *pdev = to_pci_dev(dev);
404 unsigned long val;
405
406 if (kstrtoul(buf, 0, &val) < 0)
407 return -EINVAL;
408
409 pdev->d3cold_allowed = !!val;
410 if (pdev->d3cold_allowed)
411 pci_d3cold_enable(pdev);
412 else
413 pci_d3cold_disable(pdev);
414
415 pm_runtime_resume(dev);
416
417 return count;
418}
419
420static ssize_t d3cold_allowed_show(struct device *dev,
421 struct device_attribute *attr, char *buf)
422{
423 struct pci_dev *pdev = to_pci_dev(dev);
424 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
425}
426static DEVICE_ATTR_RW(d3cold_allowed);
427#endif
428
429#ifdef CONFIG_OF
430static ssize_t devspec_show(struct device *dev,
431 struct device_attribute *attr, char *buf)
432{
433 struct pci_dev *pdev = to_pci_dev(dev);
434 struct device_node *np = pci_device_to_OF_node(pdev);
435
436 if (np == NULL || np->full_name == NULL)
437 return 0;
438 return sprintf(buf, "%s", np->full_name);
439}
440static DEVICE_ATTR_RO(devspec);
441#endif
442
443#ifdef CONFIG_PCI_IOV
444static ssize_t sriov_totalvfs_show(struct device *dev,
445 struct device_attribute *attr,
446 char *buf)
447{
448 struct pci_dev *pdev = to_pci_dev(dev);
449
450 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
451}
452
453
454static ssize_t sriov_numvfs_show(struct device *dev,
455 struct device_attribute *attr,
456 char *buf)
457{
458 struct pci_dev *pdev = to_pci_dev(dev);
459
460 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
461}
462
463/*
464 * num_vfs > 0; number of VFs to enable
465 * num_vfs = 0; disable all VFs
466 *
467 * Note: SRIOV spec doesn't allow partial VF
468 * disable, so it's all or none.
469 */
470static ssize_t sriov_numvfs_store(struct device *dev,
471 struct device_attribute *attr,
472 const char *buf, size_t count)
473{
474 struct pci_dev *pdev = to_pci_dev(dev);
475 int ret;
476 u16 num_vfs;
477
478 ret = kstrtou16(buf, 0, &num_vfs);
479 if (ret < 0)
480 return ret;
481
482 if (num_vfs > pci_sriov_get_totalvfs(pdev))
483 return -ERANGE;
484
485 if (num_vfs == pdev->sriov->num_VFs)
486 return count; /* no change */
487
488 /* is PF driver loaded w/callback */
489 if (!pdev->driver || !pdev->driver->sriov_configure) {
490 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
491 return -ENOSYS;
492 }
493
494 if (num_vfs == 0) {
495 /* disable VFs */
496 ret = pdev->driver->sriov_configure(pdev, 0);
497 if (ret < 0)
498 return ret;
499 return count;
500 }
501
502 /* enable VFs */
503 if (pdev->sriov->num_VFs) {
504 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
505 pdev->sriov->num_VFs, num_vfs);
506 return -EBUSY;
507 }
508
509 ret = pdev->driver->sriov_configure(pdev, num_vfs);
510 if (ret < 0)
511 return ret;
512
513 if (ret != num_vfs)
514 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
515 num_vfs, ret);
516
517 return count;
518}
519
520static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
521static struct device_attribute sriov_numvfs_attr =
522 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
523 sriov_numvfs_show, sriov_numvfs_store);
524#endif /* CONFIG_PCI_IOV */
525
526static ssize_t driver_override_store(struct device *dev,
527 struct device_attribute *attr,
528 const char *buf, size_t count)
529{
530 struct pci_dev *pdev = to_pci_dev(dev);
531 char *driver_override, *old = pdev->driver_override, *cp;
532
533 /* We need to keep extra room for a newline */
534 if (count >= (PAGE_SIZE - 1))
535 return -EINVAL;
536
537 driver_override = kstrndup(buf, count, GFP_KERNEL);
538 if (!driver_override)
539 return -ENOMEM;
540
541 cp = strchr(driver_override, '\n');
542 if (cp)
543 *cp = '\0';
544
545 if (strlen(driver_override)) {
546 pdev->driver_override = driver_override;
547 } else {
548 kfree(driver_override);
549 pdev->driver_override = NULL;
550 }
551
552 kfree(old);
553
554 return count;
555}
556
557static ssize_t driver_override_show(struct device *dev,
558 struct device_attribute *attr, char *buf)
559{
560 struct pci_dev *pdev = to_pci_dev(dev);
561
562 return snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
563}
564static DEVICE_ATTR_RW(driver_override);
565
566static struct attribute *pci_dev_attrs[] = {
567 &dev_attr_resource.attr,
568 &dev_attr_vendor.attr,
569 &dev_attr_device.attr,
570 &dev_attr_subsystem_vendor.attr,
571 &dev_attr_subsystem_device.attr,
572 &dev_attr_revision.attr,
573 &dev_attr_class.attr,
574 &dev_attr_irq.attr,
575 &dev_attr_local_cpus.attr,
576 &dev_attr_local_cpulist.attr,
577 &dev_attr_modalias.attr,
578#ifdef CONFIG_NUMA
579 &dev_attr_numa_node.attr,
580#endif
581 &dev_attr_dma_mask_bits.attr,
582 &dev_attr_consistent_dma_mask_bits.attr,
583 &dev_attr_enable.attr,
584 &dev_attr_broken_parity_status.attr,
585 &dev_attr_msi_bus.attr,
586#if defined(CONFIG_PM) && defined(CONFIG_ACPI)
587 &dev_attr_d3cold_allowed.attr,
588#endif
589#ifdef CONFIG_OF
590 &dev_attr_devspec.attr,
591#endif
592 &dev_attr_driver_override.attr,
593 NULL,
594};
595
596static const struct attribute_group pci_dev_group = {
597 .attrs = pci_dev_attrs,
598};
599
600const struct attribute_group *pci_dev_groups[] = {
601 &pci_dev_group,
602 NULL,
603};
604
605static struct attribute *pcibus_attrs[] = {
606 &dev_attr_rescan.attr,
607 &dev_attr_cpuaffinity.attr,
608 &dev_attr_cpulistaffinity.attr,
609 NULL,
610};
611
612static const struct attribute_group pcibus_group = {
613 .attrs = pcibus_attrs,
614};
615
616const struct attribute_group *pcibus_groups[] = {
617 &pcibus_group,
618 NULL,
619};
620
621static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
622 char *buf)
623{
624 struct pci_dev *pdev = to_pci_dev(dev);
625 struct pci_dev *vga_dev = vga_default_device();
626
627 if (vga_dev)
628 return sprintf(buf, "%u\n", (pdev == vga_dev));
629
630 return sprintf(buf, "%u\n",
631 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
632 IORESOURCE_ROM_SHADOW));
633}
634static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
635
636static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
637 struct bin_attribute *bin_attr, char *buf,
638 loff_t off, size_t count)
639{
640 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
641 unsigned int size = 64;
642 loff_t init_off = off;
643 u8 *data = (u8 *) buf;
644
645 /* Several chips lock up trying to read undefined config space */
646 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
647 size = dev->cfg_size;
648 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
649 size = 128;
650
651 if (off > size)
652 return 0;
653 if (off + count > size) {
654 size -= off;
655 count = size;
656 } else {
657 size = count;
658 }
659
660 pci_config_pm_runtime_get(dev);
661
662 if ((off & 1) && size) {
663 u8 val;
664 pci_user_read_config_byte(dev, off, &val);
665 data[off - init_off] = val;
666 off++;
667 size--;
668 }
669
670 if ((off & 3) && size > 2) {
671 u16 val;
672 pci_user_read_config_word(dev, off, &val);
673 data[off - init_off] = val & 0xff;
674 data[off - init_off + 1] = (val >> 8) & 0xff;
675 off += 2;
676 size -= 2;
677 }
678
679 while (size > 3) {
680 u32 val;
681 pci_user_read_config_dword(dev, off, &val);
682 data[off - init_off] = val & 0xff;
683 data[off - init_off + 1] = (val >> 8) & 0xff;
684 data[off - init_off + 2] = (val >> 16) & 0xff;
685 data[off - init_off + 3] = (val >> 24) & 0xff;
686 off += 4;
687 size -= 4;
688 }
689
690 if (size >= 2) {
691 u16 val;
692 pci_user_read_config_word(dev, off, &val);
693 data[off - init_off] = val & 0xff;
694 data[off - init_off + 1] = (val >> 8) & 0xff;
695 off += 2;
696 size -= 2;
697 }
698
699 if (size > 0) {
700 u8 val;
701 pci_user_read_config_byte(dev, off, &val);
702 data[off - init_off] = val;
703 off++;
704 --size;
705 }
706
707 pci_config_pm_runtime_put(dev);
708
709 return count;
710}
711
712static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
713 struct bin_attribute *bin_attr, char *buf,
714 loff_t off, size_t count)
715{
716 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
717 unsigned int size = count;
718 loff_t init_off = off;
719 u8 *data = (u8 *) buf;
720
721 if (off > dev->cfg_size)
722 return 0;
723 if (off + count > dev->cfg_size) {
724 size = dev->cfg_size - off;
725 count = size;
726 }
727
728 pci_config_pm_runtime_get(dev);
729
730 if ((off & 1) && size) {
731 pci_user_write_config_byte(dev, off, data[off - init_off]);
732 off++;
733 size--;
734 }
735
736 if ((off & 3) && size > 2) {
737 u16 val = data[off - init_off];
738 val |= (u16) data[off - init_off + 1] << 8;
739 pci_user_write_config_word(dev, off, val);
740 off += 2;
741 size -= 2;
742 }
743
744 while (size > 3) {
745 u32 val = data[off - init_off];
746 val |= (u32) data[off - init_off + 1] << 8;
747 val |= (u32) data[off - init_off + 2] << 16;
748 val |= (u32) data[off - init_off + 3] << 24;
749 pci_user_write_config_dword(dev, off, val);
750 off += 4;
751 size -= 4;
752 }
753
754 if (size >= 2) {
755 u16 val = data[off - init_off];
756 val |= (u16) data[off - init_off + 1] << 8;
757 pci_user_write_config_word(dev, off, val);
758 off += 2;
759 size -= 2;
760 }
761
762 if (size) {
763 pci_user_write_config_byte(dev, off, data[off - init_off]);
764 off++;
765 --size;
766 }
767
768 pci_config_pm_runtime_put(dev);
769
770 return count;
771}
772
773static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
774 struct bin_attribute *bin_attr, char *buf,
775 loff_t off, size_t count)
776{
777 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
778
779 if (bin_attr->size > 0) {
780 if (off > bin_attr->size)
781 count = 0;
782 else if (count > bin_attr->size - off)
783 count = bin_attr->size - off;
784 }
785
786 return pci_read_vpd(dev, off, count, buf);
787}
788
789static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
790 struct bin_attribute *bin_attr, char *buf,
791 loff_t off, size_t count)
792{
793 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
794
795 if (bin_attr->size > 0) {
796 if (off > bin_attr->size)
797 count = 0;
798 else if (count > bin_attr->size - off)
799 count = bin_attr->size - off;
800 }
801
802 return pci_write_vpd(dev, off, count, buf);
803}
804
805#ifdef HAVE_PCI_LEGACY
806/**
807 * pci_read_legacy_io - read byte(s) from legacy I/O port space
808 * @filp: open sysfs file
809 * @kobj: kobject corresponding to file to read from
810 * @bin_attr: struct bin_attribute for this file
811 * @buf: buffer to store results
812 * @off: offset into legacy I/O port space
813 * @count: number of bytes to read
814 *
815 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
816 * callback routine (pci_legacy_read).
817 */
818static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
819 struct bin_attribute *bin_attr, char *buf,
820 loff_t off, size_t count)
821{
822 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
823
824 /* Only support 1, 2 or 4 byte accesses */
825 if (count != 1 && count != 2 && count != 4)
826 return -EINVAL;
827
828 return pci_legacy_read(bus, off, (u32 *)buf, count);
829}
830
831/**
832 * pci_write_legacy_io - write byte(s) to legacy I/O port space
833 * @filp: open sysfs file
834 * @kobj: kobject corresponding to file to read from
835 * @bin_attr: struct bin_attribute for this file
836 * @buf: buffer containing value to be written
837 * @off: offset into legacy I/O port space
838 * @count: number of bytes to write
839 *
840 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
841 * callback routine (pci_legacy_write).
842 */
843static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
844 struct bin_attribute *bin_attr, char *buf,
845 loff_t off, size_t count)
846{
847 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
848
849 /* Only support 1, 2 or 4 byte accesses */
850 if (count != 1 && count != 2 && count != 4)
851 return -EINVAL;
852
853 return pci_legacy_write(bus, off, *(u32 *)buf, count);
854}
855
856/**
857 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
858 * @filp: open sysfs file
859 * @kobj: kobject corresponding to device to be mapped
860 * @attr: struct bin_attribute for this file
861 * @vma: struct vm_area_struct passed to mmap
862 *
863 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
864 * legacy memory space (first meg of bus space) into application virtual
865 * memory space.
866 */
867static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
868 struct bin_attribute *attr,
869 struct vm_area_struct *vma)
870{
871 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
872
873 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
874}
875
876/**
877 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
878 * @filp: open sysfs file
879 * @kobj: kobject corresponding to device to be mapped
880 * @attr: struct bin_attribute for this file
881 * @vma: struct vm_area_struct passed to mmap
882 *
883 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
884 * legacy IO space (first meg of bus space) into application virtual
885 * memory space. Returns -ENOSYS if the operation isn't supported
886 */
887static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
888 struct bin_attribute *attr,
889 struct vm_area_struct *vma)
890{
891 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
892
893 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
894}
895
896/**
897 * pci_adjust_legacy_attr - adjustment of legacy file attributes
898 * @b: bus to create files under
899 * @mmap_type: I/O port or memory
900 *
901 * Stub implementation. Can be overridden by arch if necessary.
902 */
903void __weak pci_adjust_legacy_attr(struct pci_bus *b,
904 enum pci_mmap_state mmap_type)
905{
906}
907
908/**
909 * pci_create_legacy_files - create legacy I/O port and memory files
910 * @b: bus to create files under
911 *
912 * Some platforms allow access to legacy I/O port and ISA memory space on
913 * a per-bus basis. This routine creates the files and ties them into
914 * their associated read, write and mmap files from pci-sysfs.c
915 *
916 * On error unwind, but don't propagate the error to the caller
917 * as it is ok to set up the PCI bus without these files.
918 */
919void pci_create_legacy_files(struct pci_bus *b)
920{
921 int error;
922
923 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
924 GFP_ATOMIC);
925 if (!b->legacy_io)
926 goto kzalloc_err;
927
928 sysfs_bin_attr_init(b->legacy_io);
929 b->legacy_io->attr.name = "legacy_io";
930 b->legacy_io->size = 0xffff;
931 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
932 b->legacy_io->read = pci_read_legacy_io;
933 b->legacy_io->write = pci_write_legacy_io;
934 b->legacy_io->mmap = pci_mmap_legacy_io;
935 pci_adjust_legacy_attr(b, pci_mmap_io);
936 error = device_create_bin_file(&b->dev, b->legacy_io);
937 if (error)
938 goto legacy_io_err;
939
940 /* Allocated above after the legacy_io struct */
941 b->legacy_mem = b->legacy_io + 1;
942 sysfs_bin_attr_init(b->legacy_mem);
943 b->legacy_mem->attr.name = "legacy_mem";
944 b->legacy_mem->size = 1024*1024;
945 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
946 b->legacy_mem->mmap = pci_mmap_legacy_mem;
947 pci_adjust_legacy_attr(b, pci_mmap_mem);
948 error = device_create_bin_file(&b->dev, b->legacy_mem);
949 if (error)
950 goto legacy_mem_err;
951
952 return;
953
954legacy_mem_err:
955 device_remove_bin_file(&b->dev, b->legacy_io);
956legacy_io_err:
957 kfree(b->legacy_io);
958 b->legacy_io = NULL;
959kzalloc_err:
960 printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
961 return;
962}
963
964void pci_remove_legacy_files(struct pci_bus *b)
965{
966 if (b->legacy_io) {
967 device_remove_bin_file(&b->dev, b->legacy_io);
968 device_remove_bin_file(&b->dev, b->legacy_mem);
969 kfree(b->legacy_io); /* both are allocated here */
970 }
971}
972#endif /* HAVE_PCI_LEGACY */
973
974#ifdef HAVE_PCI_MMAP
975
976int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
977 enum pci_mmap_api mmap_api)
978{
979 unsigned long nr, start, size, pci_start;
980
981 if (pci_resource_len(pdev, resno) == 0)
982 return 0;
983 nr = vma_pages(vma);
984 start = vma->vm_pgoff;
985 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
986 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
987 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
988 if (start >= pci_start && start < pci_start + size &&
989 start + nr <= pci_start + size)
990 return 1;
991 return 0;
992}
993
994/**
995 * pci_mmap_resource - map a PCI resource into user memory space
996 * @kobj: kobject for mapping
997 * @attr: struct bin_attribute for the file being mapped
998 * @vma: struct vm_area_struct passed into the mmap
999 * @write_combine: 1 for write_combine mapping
1000 *
1001 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1002 */
1003static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1004 struct vm_area_struct *vma, int write_combine)
1005{
1006 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1007 struct resource *res = attr->private;
1008 enum pci_mmap_state mmap_type;
1009 resource_size_t start, end;
1010 int i;
1011
1012 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1013 if (res == &pdev->resource[i])
1014 break;
1015 if (i >= PCI_ROM_RESOURCE)
1016 return -ENODEV;
1017
1018 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1019 return -EINVAL;
1020
1021 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
1022 WARN(1, "process \"%s\" tried to map 0x%08lx bytes at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
1023 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
1024 pci_name(pdev), i,
1025 (u64)pci_resource_start(pdev, i),
1026 (u64)pci_resource_len(pdev, i));
1027 return -EINVAL;
1028 }
1029
1030 /* pci_mmap_page_range() expects the same kind of entry as coming
1031 * from /proc/bus/pci/ which is a "user visible" value. If this is
1032 * different from the resource itself, arch will do necessary fixup.
1033 */
1034 pci_resource_to_user(pdev, i, res, &start, &end);
1035 vma->vm_pgoff += start >> PAGE_SHIFT;
1036 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1037 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1038}
1039
1040static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1041 struct bin_attribute *attr,
1042 struct vm_area_struct *vma)
1043{
1044 return pci_mmap_resource(kobj, attr, vma, 0);
1045}
1046
1047static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1048 struct bin_attribute *attr,
1049 struct vm_area_struct *vma)
1050{
1051 return pci_mmap_resource(kobj, attr, vma, 1);
1052}
1053
1054static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1055 struct bin_attribute *attr, char *buf,
1056 loff_t off, size_t count, bool write)
1057{
1058 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1059 struct resource *res = attr->private;
1060 unsigned long port = off;
1061 int i;
1062
1063 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1064 if (res == &pdev->resource[i])
1065 break;
1066 if (i >= PCI_ROM_RESOURCE)
1067 return -ENODEV;
1068
1069 port += pci_resource_start(pdev, i);
1070
1071 if (port > pci_resource_end(pdev, i))
1072 return 0;
1073
1074 if (port + count - 1 > pci_resource_end(pdev, i))
1075 return -EINVAL;
1076
1077 switch (count) {
1078 case 1:
1079 if (write)
1080 outb(*(u8 *)buf, port);
1081 else
1082 *(u8 *)buf = inb(port);
1083 return 1;
1084 case 2:
1085 if (write)
1086 outw(*(u16 *)buf, port);
1087 else
1088 *(u16 *)buf = inw(port);
1089 return 2;
1090 case 4:
1091 if (write)
1092 outl(*(u32 *)buf, port);
1093 else
1094 *(u32 *)buf = inl(port);
1095 return 4;
1096 }
1097 return -EINVAL;
1098}
1099
1100static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1101 struct bin_attribute *attr, char *buf,
1102 loff_t off, size_t count)
1103{
1104 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1105}
1106
1107static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1108 struct bin_attribute *attr, char *buf,
1109 loff_t off, size_t count)
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 */
1121static 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
1142static 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 res_attr->mmap = pci_mmap_resource_uc;
1165 }
1166 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1167 res_attr->read = pci_read_resource_io;
1168 res_attr->write = pci_write_resource_io;
1169 }
1170 res_attr->attr.name = res_attr_name;
1171 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1172 res_attr->size = pci_resource_len(pdev, num);
1173 res_attr->private = &pdev->resource[num];
1174 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1175 if (retval)
1176 kfree(res_attr);
1177
1178 return retval;
1179}
1180
1181/**
1182 * pci_create_resource_files - create resource files in sysfs for @dev
1183 * @pdev: dev in question
1184 *
1185 * Walk the resources in @pdev creating files for each resource available.
1186 */
1187static int pci_create_resource_files(struct pci_dev *pdev)
1188{
1189 int i;
1190 int retval;
1191
1192 /* Expose the PCI resources from this device as files */
1193 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1194
1195 /* skip empty resources */
1196 if (!pci_resource_len(pdev, i))
1197 continue;
1198
1199 retval = pci_create_attr(pdev, i, 0);
1200 /* for prefetchable resources, create a WC mappable file */
1201 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1202 retval = pci_create_attr(pdev, i, 1);
1203
1204 if (retval) {
1205 pci_remove_resource_files(pdev);
1206 return retval;
1207 }
1208 }
1209 return 0;
1210}
1211#else /* !HAVE_PCI_MMAP */
1212int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1213void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1214#endif /* HAVE_PCI_MMAP */
1215
1216/**
1217 * pci_write_rom - used to enable access to the PCI ROM display
1218 * @filp: sysfs file
1219 * @kobj: kernel object handle
1220 * @bin_attr: struct bin_attribute for this file
1221 * @buf: user input
1222 * @off: file offset
1223 * @count: number of byte in input
1224 *
1225 * writing anything except 0 enables it
1226 */
1227static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1228 struct bin_attribute *bin_attr, char *buf,
1229 loff_t off, size_t count)
1230{
1231 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1232
1233 if ((off == 0) && (*buf == '0') && (count == 2))
1234 pdev->rom_attr_enabled = 0;
1235 else
1236 pdev->rom_attr_enabled = 1;
1237
1238 return count;
1239}
1240
1241/**
1242 * pci_read_rom - read a PCI ROM
1243 * @filp: sysfs file
1244 * @kobj: kernel object handle
1245 * @bin_attr: struct bin_attribute for this file
1246 * @buf: where to put the data we read from the ROM
1247 * @off: file offset
1248 * @count: number of bytes to read
1249 *
1250 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1251 * device corresponding to @kobj.
1252 */
1253static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1254 struct bin_attribute *bin_attr, char *buf,
1255 loff_t off, size_t count)
1256{
1257 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1258 void __iomem *rom;
1259 size_t size;
1260
1261 if (!pdev->rom_attr_enabled)
1262 return -EINVAL;
1263
1264 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1265 if (!rom || !size)
1266 return -EIO;
1267
1268 if (off >= size)
1269 count = 0;
1270 else {
1271 if (off + count > size)
1272 count = size - off;
1273
1274 memcpy_fromio(buf, rom + off, count);
1275 }
1276 pci_unmap_rom(pdev, rom);
1277
1278 return count;
1279}
1280
1281static struct bin_attribute pci_config_attr = {
1282 .attr = {
1283 .name = "config",
1284 .mode = S_IRUGO | S_IWUSR,
1285 },
1286 .size = PCI_CFG_SPACE_SIZE,
1287 .read = pci_read_config,
1288 .write = pci_write_config,
1289};
1290
1291static struct bin_attribute pcie_config_attr = {
1292 .attr = {
1293 .name = "config",
1294 .mode = S_IRUGO | S_IWUSR,
1295 },
1296 .size = PCI_CFG_SPACE_EXP_SIZE,
1297 .read = pci_read_config,
1298 .write = pci_write_config,
1299};
1300
1301static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1302 const char *buf, size_t count)
1303{
1304 struct pci_dev *pdev = to_pci_dev(dev);
1305 unsigned long val;
1306 ssize_t result = kstrtoul(buf, 0, &val);
1307
1308 if (result < 0)
1309 return result;
1310
1311 if (val != 1)
1312 return -EINVAL;
1313
1314 result = pci_reset_function(pdev);
1315 if (result < 0)
1316 return result;
1317
1318 return count;
1319}
1320
1321static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1322
1323static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1324{
1325 int retval;
1326 struct bin_attribute *attr;
1327
1328 /* If the device has VPD, try to expose it in sysfs. */
1329 if (dev->vpd) {
1330 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1331 if (!attr)
1332 return -ENOMEM;
1333
1334 sysfs_bin_attr_init(attr);
1335 attr->size = 0;
1336 attr->attr.name = "vpd";
1337 attr->attr.mode = S_IRUSR | S_IWUSR;
1338 attr->read = read_vpd_attr;
1339 attr->write = write_vpd_attr;
1340 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1341 if (retval) {
1342 kfree(attr);
1343 return retval;
1344 }
1345 dev->vpd->attr = attr;
1346 }
1347
1348 /* Active State Power Management */
1349 pcie_aspm_create_sysfs_dev_files(dev);
1350
1351 if (!pci_probe_reset_function(dev)) {
1352 retval = device_create_file(&dev->dev, &reset_attr);
1353 if (retval)
1354 goto error;
1355 dev->reset_fn = 1;
1356 }
1357 return 0;
1358
1359error:
1360 pcie_aspm_remove_sysfs_dev_files(dev);
1361 if (dev->vpd && dev->vpd->attr) {
1362 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1363 kfree(dev->vpd->attr);
1364 }
1365
1366 return retval;
1367}
1368
1369int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1370{
1371 int retval;
1372 int rom_size;
1373 struct bin_attribute *attr;
1374
1375 if (!sysfs_initialized)
1376 return -EACCES;
1377
1378 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1379 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1380 else
1381 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1382 if (retval)
1383 goto err;
1384
1385 retval = pci_create_resource_files(pdev);
1386 if (retval)
1387 goto err_config_file;
1388
1389 /* If the device has a ROM, try to expose it in sysfs. */
1390 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1391 if (rom_size) {
1392 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1393 if (!attr) {
1394 retval = -ENOMEM;
1395 goto err_resource_files;
1396 }
1397 sysfs_bin_attr_init(attr);
1398 attr->size = rom_size;
1399 attr->attr.name = "rom";
1400 attr->attr.mode = S_IRUSR | S_IWUSR;
1401 attr->read = pci_read_rom;
1402 attr->write = pci_write_rom;
1403 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1404 if (retval) {
1405 kfree(attr);
1406 goto err_resource_files;
1407 }
1408 pdev->rom_attr = attr;
1409 }
1410
1411 /* add sysfs entries for various capabilities */
1412 retval = pci_create_capabilities_sysfs(pdev);
1413 if (retval)
1414 goto err_rom_file;
1415
1416 pci_create_firmware_label_files(pdev);
1417
1418 return 0;
1419
1420err_rom_file:
1421 if (pdev->rom_attr) {
1422 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1423 kfree(pdev->rom_attr);
1424 pdev->rom_attr = NULL;
1425 }
1426err_resource_files:
1427 pci_remove_resource_files(pdev);
1428err_config_file:
1429 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1430 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1431 else
1432 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1433err:
1434 return retval;
1435}
1436
1437static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1438{
1439 if (dev->vpd && dev->vpd->attr) {
1440 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1441 kfree(dev->vpd->attr);
1442 }
1443
1444 pcie_aspm_remove_sysfs_dev_files(dev);
1445 if (dev->reset_fn) {
1446 device_remove_file(&dev->dev, &reset_attr);
1447 dev->reset_fn = 0;
1448 }
1449}
1450
1451/**
1452 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1453 * @pdev: device whose entries we should free
1454 *
1455 * Cleanup when @pdev is removed from sysfs.
1456 */
1457void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1458{
1459 if (!sysfs_initialized)
1460 return;
1461
1462 pci_remove_capabilities_sysfs(pdev);
1463
1464 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1465 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1466 else
1467 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1468
1469 pci_remove_resource_files(pdev);
1470
1471 if (pdev->rom_attr) {
1472 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1473 kfree(pdev->rom_attr);
1474 pdev->rom_attr = NULL;
1475 }
1476
1477 pci_remove_firmware_label_files(pdev);
1478}
1479
1480static int __init pci_sysfs_init(void)
1481{
1482 struct pci_dev *pdev = NULL;
1483 int retval;
1484
1485 sysfs_initialized = 1;
1486 for_each_pci_dev(pdev) {
1487 retval = pci_create_sysfs_dev_files(pdev);
1488 if (retval) {
1489 pci_dev_put(pdev);
1490 return retval;
1491 }
1492 }
1493
1494 return 0;
1495}
1496late_initcall(pci_sysfs_init);
1497
1498static struct attribute *pci_dev_dev_attrs[] = {
1499 &vga_attr.attr,
1500 NULL,
1501};
1502
1503static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1504 struct attribute *a, int n)
1505{
1506 struct device *dev = kobj_to_dev(kobj);
1507 struct pci_dev *pdev = to_pci_dev(dev);
1508
1509 if (a == &vga_attr.attr)
1510 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1511 return 0;
1512
1513 return a->mode;
1514}
1515
1516static struct attribute *pci_dev_hp_attrs[] = {
1517 &dev_remove_attr.attr,
1518 &dev_rescan_attr.attr,
1519 NULL,
1520};
1521
1522static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1523 struct attribute *a, int n)
1524{
1525 struct device *dev = kobj_to_dev(kobj);
1526 struct pci_dev *pdev = to_pci_dev(dev);
1527
1528 if (pdev->is_virtfn)
1529 return 0;
1530
1531 return a->mode;
1532}
1533
1534static struct attribute_group pci_dev_hp_attr_group = {
1535 .attrs = pci_dev_hp_attrs,
1536 .is_visible = pci_dev_hp_attrs_are_visible,
1537};
1538
1539#ifdef CONFIG_PCI_IOV
1540static struct attribute *sriov_dev_attrs[] = {
1541 &sriov_totalvfs_attr.attr,
1542 &sriov_numvfs_attr.attr,
1543 NULL,
1544};
1545
1546static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1547 struct attribute *a, int n)
1548{
1549 struct device *dev = kobj_to_dev(kobj);
1550
1551 if (!dev_is_pf(dev))
1552 return 0;
1553
1554 return a->mode;
1555}
1556
1557static struct attribute_group sriov_dev_attr_group = {
1558 .attrs = sriov_dev_attrs,
1559 .is_visible = sriov_attrs_are_visible,
1560};
1561#endif /* CONFIG_PCI_IOV */
1562
1563static struct attribute_group pci_dev_attr_group = {
1564 .attrs = pci_dev_dev_attrs,
1565 .is_visible = pci_dev_attrs_are_visible,
1566};
1567
1568static const struct attribute_group *pci_dev_attr_groups[] = {
1569 &pci_dev_attr_group,
1570 &pci_dev_hp_attr_group,
1571#ifdef CONFIG_PCI_IOV
1572 &sriov_dev_attr_group,
1573#endif
1574 NULL,
1575};
1576
1577struct device_type pci_dev_type = {
1578 .groups = pci_dev_attr_groups,
1579};