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