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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 "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};