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pcnet-cs: declare MODULE_FIRMWARE
[deliverable/linux.git] / drivers / pci / pci-sysfs.c
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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/topology.h>
23#include <linux/mm.h>
24#include <linux/capability.h>
25#include <linux/pci-aspm.h>
26#include "pci.h"
27
28static int sysfs_initialized; /* = 0 */
29
30/* show configuration fields */
31#define pci_config_attr(field, format_string) \
32static ssize_t \
33field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
34{ \
35 struct pci_dev *pdev; \
36 \
37 pdev = to_pci_dev (dev); \
38 return sprintf (buf, format_string, pdev->field); \
39}
40
41pci_config_attr(vendor, "0x%04x\n");
42pci_config_attr(device, "0x%04x\n");
43pci_config_attr(subsystem_vendor, "0x%04x\n");
44pci_config_attr(subsystem_device, "0x%04x\n");
45pci_config_attr(class, "0x%06x\n");
46pci_config_attr(irq, "%u\n");
47
48static ssize_t broken_parity_status_show(struct device *dev,
49 struct device_attribute *attr,
50 char *buf)
51{
52 struct pci_dev *pdev = to_pci_dev(dev);
53 return sprintf (buf, "%u\n", pdev->broken_parity_status);
54}
55
56static ssize_t broken_parity_status_store(struct device *dev,
57 struct device_attribute *attr,
58 const char *buf, size_t count)
59{
60 struct pci_dev *pdev = to_pci_dev(dev);
61 unsigned long val;
62
63 if (strict_strtoul(buf, 0, &val) < 0)
64 return -EINVAL;
65
66 pdev->broken_parity_status = !!val;
67
68 return count;
69}
70
71static ssize_t local_cpus_show(struct device *dev,
72 struct device_attribute *attr, char *buf)
73{
74 const struct cpumask *mask;
75 int len;
76
77 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
78 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
79 buf[len++] = '\n';
80 buf[len] = '\0';
81 return len;
82}
83
84
85static ssize_t local_cpulist_show(struct device *dev,
86 struct device_attribute *attr, char *buf)
87{
88 const struct cpumask *mask;
89 int len;
90
91 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
92 len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
93 buf[len++] = '\n';
94 buf[len] = '\0';
95 return len;
96}
97
98/* show resources */
99static ssize_t
100resource_show(struct device * dev, struct device_attribute *attr, char * buf)
101{
102 struct pci_dev * pci_dev = to_pci_dev(dev);
103 char * str = buf;
104 int i;
105 int max;
106 resource_size_t start, end;
107
108 if (pci_dev->subordinate)
109 max = DEVICE_COUNT_RESOURCE;
110 else
111 max = PCI_BRIDGE_RESOURCES;
112
113 for (i = 0; i < max; i++) {
114 struct resource *res = &pci_dev->resource[i];
115 pci_resource_to_user(pci_dev, i, res, &start, &end);
116 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
117 (unsigned long long)start,
118 (unsigned long long)end,
119 (unsigned long long)res->flags);
120 }
121 return (str - buf);
122}
123
124static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
125{
126 struct pci_dev *pci_dev = to_pci_dev(dev);
127
128 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
129 pci_dev->vendor, pci_dev->device,
130 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
131 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
132 (u8)(pci_dev->class));
133}
134
135static ssize_t is_enabled_store(struct device *dev,
136 struct device_attribute *attr, const char *buf,
137 size_t count)
138{
139 struct pci_dev *pdev = to_pci_dev(dev);
140 unsigned long val;
141 ssize_t result = strict_strtoul(buf, 0, &val);
142
143 if (result < 0)
144 return result;
145
146 /* this can crash the machine when done on the "wrong" device */
147 if (!capable(CAP_SYS_ADMIN))
148 return -EPERM;
149
150 if (!val) {
151 if (pci_is_enabled(pdev))
152 pci_disable_device(pdev);
153 else
154 result = -EIO;
155 } else
156 result = pci_enable_device(pdev);
157
158 return result < 0 ? result : count;
159}
160
161static ssize_t is_enabled_show(struct device *dev,
162 struct device_attribute *attr, char *buf)
163{
164 struct pci_dev *pdev;
165
166 pdev = to_pci_dev (dev);
167 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
168}
169
170#ifdef CONFIG_NUMA
171static ssize_t
172numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
173{
174 return sprintf (buf, "%d\n", dev->numa_node);
175}
176#endif
177
178static ssize_t
179msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
180{
181 struct pci_dev *pdev = to_pci_dev(dev);
182
183 if (!pdev->subordinate)
184 return 0;
185
186 return sprintf (buf, "%u\n",
187 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
188}
189
190static ssize_t
191msi_bus_store(struct device *dev, struct device_attribute *attr,
192 const char *buf, size_t count)
193{
194 struct pci_dev *pdev = to_pci_dev(dev);
195 unsigned long val;
196
197 if (strict_strtoul(buf, 0, &val) < 0)
198 return -EINVAL;
199
200 /* bad things may happen if the no_msi flag is changed
201 * while some drivers are loaded */
202 if (!capable(CAP_SYS_ADMIN))
203 return -EPERM;
204
205 /* Maybe pci devices without subordinate busses shouldn't even have this
206 * attribute in the first place? */
207 if (!pdev->subordinate)
208 return count;
209
210 /* Is the flag going to change, or keep the value it already had? */
211 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
212 !!val) {
213 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
214
215 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
216 " bad things could happen\n", val ? "" : " not");
217 }
218
219 return count;
220}
221
222#ifdef CONFIG_HOTPLUG
223static DEFINE_MUTEX(pci_remove_rescan_mutex);
224static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
225 size_t count)
226{
227 unsigned long val;
228 struct pci_bus *b = NULL;
229
230 if (strict_strtoul(buf, 0, &val) < 0)
231 return -EINVAL;
232
233 if (val) {
234 mutex_lock(&pci_remove_rescan_mutex);
235 while ((b = pci_find_next_bus(b)) != NULL)
236 pci_rescan_bus(b);
237 mutex_unlock(&pci_remove_rescan_mutex);
238 }
239 return count;
240}
241
242struct bus_attribute pci_bus_attrs[] = {
243 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
244 __ATTR_NULL
245};
246
247static ssize_t
248dev_rescan_store(struct device *dev, struct device_attribute *attr,
249 const char *buf, size_t count)
250{
251 unsigned long val;
252 struct pci_dev *pdev = to_pci_dev(dev);
253
254 if (strict_strtoul(buf, 0, &val) < 0)
255 return -EINVAL;
256
257 if (val) {
258 mutex_lock(&pci_remove_rescan_mutex);
259 pci_rescan_bus(pdev->bus);
260 mutex_unlock(&pci_remove_rescan_mutex);
261 }
262 return count;
263}
264
265static void remove_callback(struct device *dev)
266{
267 struct pci_dev *pdev = to_pci_dev(dev);
268
269 mutex_lock(&pci_remove_rescan_mutex);
270 pci_remove_bus_device(pdev);
271 mutex_unlock(&pci_remove_rescan_mutex);
272}
273
274static ssize_t
275remove_store(struct device *dev, struct device_attribute *dummy,
276 const char *buf, size_t count)
277{
278 int ret = 0;
279 unsigned long val;
280
281 if (strict_strtoul(buf, 0, &val) < 0)
282 return -EINVAL;
283
284 /* An attribute cannot be unregistered by one of its own methods,
285 * so we have to use this roundabout approach.
286 */
287 if (val)
288 ret = device_schedule_callback(dev, remove_callback);
289 if (ret)
290 count = ret;
291 return count;
292}
293#endif
294
295struct device_attribute pci_dev_attrs[] = {
296 __ATTR_RO(resource),
297 __ATTR_RO(vendor),
298 __ATTR_RO(device),
299 __ATTR_RO(subsystem_vendor),
300 __ATTR_RO(subsystem_device),
301 __ATTR_RO(class),
302 __ATTR_RO(irq),
303 __ATTR_RO(local_cpus),
304 __ATTR_RO(local_cpulist),
305 __ATTR_RO(modalias),
306#ifdef CONFIG_NUMA
307 __ATTR_RO(numa_node),
308#endif
309 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
310 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
311 broken_parity_status_show,broken_parity_status_store),
312 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
313#ifdef CONFIG_HOTPLUG
314 __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
315 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
316#endif
317 __ATTR_NULL,
318};
319
320static ssize_t
321boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
322{
323 struct pci_dev *pdev = to_pci_dev(dev);
324
325 return sprintf(buf, "%u\n",
326 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
327 IORESOURCE_ROM_SHADOW));
328}
329struct device_attribute vga_attr = __ATTR_RO(boot_vga);
330
331static ssize_t
332pci_read_config(struct kobject *kobj, struct bin_attribute *bin_attr,
333 char *buf, loff_t off, size_t count)
334{
335 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
336 unsigned int size = 64;
337 loff_t init_off = off;
338 u8 *data = (u8*) buf;
339
340 /* Several chips lock up trying to read undefined config space */
341 if (capable(CAP_SYS_ADMIN)) {
342 size = dev->cfg_size;
343 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
344 size = 128;
345 }
346
347 if (off > size)
348 return 0;
349 if (off + count > size) {
350 size -= off;
351 count = size;
352 } else {
353 size = count;
354 }
355
356 if ((off & 1) && size) {
357 u8 val;
358 pci_user_read_config_byte(dev, off, &val);
359 data[off - init_off] = val;
360 off++;
361 size--;
362 }
363
364 if ((off & 3) && size > 2) {
365 u16 val;
366 pci_user_read_config_word(dev, off, &val);
367 data[off - init_off] = val & 0xff;
368 data[off - init_off + 1] = (val >> 8) & 0xff;
369 off += 2;
370 size -= 2;
371 }
372
373 while (size > 3) {
374 u32 val;
375 pci_user_read_config_dword(dev, off, &val);
376 data[off - init_off] = val & 0xff;
377 data[off - init_off + 1] = (val >> 8) & 0xff;
378 data[off - init_off + 2] = (val >> 16) & 0xff;
379 data[off - init_off + 3] = (val >> 24) & 0xff;
380 off += 4;
381 size -= 4;
382 }
383
384 if (size >= 2) {
385 u16 val;
386 pci_user_read_config_word(dev, off, &val);
387 data[off - init_off] = val & 0xff;
388 data[off - init_off + 1] = (val >> 8) & 0xff;
389 off += 2;
390 size -= 2;
391 }
392
393 if (size > 0) {
394 u8 val;
395 pci_user_read_config_byte(dev, off, &val);
396 data[off - init_off] = val;
397 off++;
398 --size;
399 }
400
401 return count;
402}
403
404static ssize_t
405pci_write_config(struct kobject *kobj, struct bin_attribute *bin_attr,
406 char *buf, loff_t off, size_t count)
407{
408 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
409 unsigned int size = count;
410 loff_t init_off = off;
411 u8 *data = (u8*) buf;
412
413 if (off > dev->cfg_size)
414 return 0;
415 if (off + count > dev->cfg_size) {
416 size = dev->cfg_size - off;
417 count = size;
418 }
419
420 if ((off & 1) && size) {
421 pci_user_write_config_byte(dev, off, data[off - init_off]);
422 off++;
423 size--;
424 }
425
426 if ((off & 3) && size > 2) {
427 u16 val = data[off - init_off];
428 val |= (u16) data[off - init_off + 1] << 8;
429 pci_user_write_config_word(dev, off, val);
430 off += 2;
431 size -= 2;
432 }
433
434 while (size > 3) {
435 u32 val = data[off - init_off];
436 val |= (u32) data[off - init_off + 1] << 8;
437 val |= (u32) data[off - init_off + 2] << 16;
438 val |= (u32) data[off - init_off + 3] << 24;
439 pci_user_write_config_dword(dev, off, val);
440 off += 4;
441 size -= 4;
442 }
443
444 if (size >= 2) {
445 u16 val = data[off - init_off];
446 val |= (u16) data[off - init_off + 1] << 8;
447 pci_user_write_config_word(dev, off, val);
448 off += 2;
449 size -= 2;
450 }
451
452 if (size) {
453 pci_user_write_config_byte(dev, off, data[off - init_off]);
454 off++;
455 --size;
456 }
457
458 return count;
459}
460
461static ssize_t
462read_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
463 char *buf, loff_t off, size_t count)
464{
465 struct pci_dev *dev =
466 to_pci_dev(container_of(kobj, struct device, kobj));
467
468 if (off > bin_attr->size)
469 count = 0;
470 else if (count > bin_attr->size - off)
471 count = bin_attr->size - off;
472
473 return pci_read_vpd(dev, off, count, buf);
474}
475
476static ssize_t
477write_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
478 char *buf, loff_t off, size_t count)
479{
480 struct pci_dev *dev =
481 to_pci_dev(container_of(kobj, struct device, kobj));
482
483 if (off > bin_attr->size)
484 count = 0;
485 else if (count > bin_attr->size - off)
486 count = bin_attr->size - off;
487
488 return pci_write_vpd(dev, off, count, buf);
489}
490
491#ifdef HAVE_PCI_LEGACY
492/**
493 * pci_read_legacy_io - read byte(s) from legacy I/O port space
494 * @kobj: kobject corresponding to file to read from
495 * @bin_attr: struct bin_attribute for this file
496 * @buf: buffer to store results
497 * @off: offset into legacy I/O port space
498 * @count: number of bytes to read
499 *
500 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
501 * callback routine (pci_legacy_read).
502 */
503static ssize_t
504pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
505 char *buf, loff_t off, size_t count)
506{
507 struct pci_bus *bus = to_pci_bus(container_of(kobj,
508 struct device,
509 kobj));
510
511 /* Only support 1, 2 or 4 byte accesses */
512 if (count != 1 && count != 2 && count != 4)
513 return -EINVAL;
514
515 return pci_legacy_read(bus, off, (u32 *)buf, count);
516}
517
518/**
519 * pci_write_legacy_io - write byte(s) to legacy I/O port space
520 * @kobj: kobject corresponding to file to read from
521 * @bin_attr: struct bin_attribute for this file
522 * @buf: buffer containing value to be written
523 * @off: offset into legacy I/O port space
524 * @count: number of bytes to write
525 *
526 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
527 * callback routine (pci_legacy_write).
528 */
529static ssize_t
530pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
531 char *buf, loff_t off, size_t count)
532{
533 struct pci_bus *bus = to_pci_bus(container_of(kobj,
534 struct device,
535 kobj));
536 /* Only support 1, 2 or 4 byte accesses */
537 if (count != 1 && count != 2 && count != 4)
538 return -EINVAL;
539
540 return pci_legacy_write(bus, off, *(u32 *)buf, count);
541}
542
543/**
544 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
545 * @kobj: kobject corresponding to device to be mapped
546 * @attr: struct bin_attribute for this file
547 * @vma: struct vm_area_struct passed to mmap
548 *
549 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
550 * legacy memory space (first meg of bus space) into application virtual
551 * memory space.
552 */
553static int
554pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
555 struct vm_area_struct *vma)
556{
557 struct pci_bus *bus = to_pci_bus(container_of(kobj,
558 struct device,
559 kobj));
560
561 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
562}
563
564/**
565 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
566 * @kobj: kobject corresponding to device to be mapped
567 * @attr: struct bin_attribute for this file
568 * @vma: struct vm_area_struct passed to mmap
569 *
570 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
571 * legacy IO space (first meg of bus space) into application virtual
572 * memory space. Returns -ENOSYS if the operation isn't supported
573 */
574static int
575pci_mmap_legacy_io(struct kobject *kobj, struct bin_attribute *attr,
576 struct vm_area_struct *vma)
577{
578 struct pci_bus *bus = to_pci_bus(container_of(kobj,
579 struct device,
580 kobj));
581
582 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
583}
584
585/**
586 * pci_adjust_legacy_attr - adjustment of legacy file attributes
587 * @b: bus to create files under
588 * @mmap_type: I/O port or memory
589 *
590 * Stub implementation. Can be overridden by arch if necessary.
591 */
592void __weak
593pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
594{
595 return;
596}
597
598/**
599 * pci_create_legacy_files - create legacy I/O port and memory files
600 * @b: bus to create files under
601 *
602 * Some platforms allow access to legacy I/O port and ISA memory space on
603 * a per-bus basis. This routine creates the files and ties them into
604 * their associated read, write and mmap files from pci-sysfs.c
605 *
606 * On error unwind, but don't propogate the error to the caller
607 * as it is ok to set up the PCI bus without these files.
608 */
609void pci_create_legacy_files(struct pci_bus *b)
610{
611 int error;
612
613 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
614 GFP_ATOMIC);
615 if (!b->legacy_io)
616 goto kzalloc_err;
617
618 b->legacy_io->attr.name = "legacy_io";
619 b->legacy_io->size = 0xffff;
620 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
621 b->legacy_io->read = pci_read_legacy_io;
622 b->legacy_io->write = pci_write_legacy_io;
623 b->legacy_io->mmap = pci_mmap_legacy_io;
624 pci_adjust_legacy_attr(b, pci_mmap_io);
625 error = device_create_bin_file(&b->dev, b->legacy_io);
626 if (error)
627 goto legacy_io_err;
628
629 /* Allocated above after the legacy_io struct */
630 b->legacy_mem = b->legacy_io + 1;
631 b->legacy_mem->attr.name = "legacy_mem";
632 b->legacy_mem->size = 1024*1024;
633 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
634 b->legacy_mem->mmap = pci_mmap_legacy_mem;
635 pci_adjust_legacy_attr(b, pci_mmap_mem);
636 error = device_create_bin_file(&b->dev, b->legacy_mem);
637 if (error)
638 goto legacy_mem_err;
639
640 return;
641
642legacy_mem_err:
643 device_remove_bin_file(&b->dev, b->legacy_io);
644legacy_io_err:
645 kfree(b->legacy_io);
646 b->legacy_io = NULL;
647kzalloc_err:
648 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
649 "and ISA memory resources to sysfs\n");
650 return;
651}
652
653void pci_remove_legacy_files(struct pci_bus *b)
654{
655 if (b->legacy_io) {
656 device_remove_bin_file(&b->dev, b->legacy_io);
657 device_remove_bin_file(&b->dev, b->legacy_mem);
658 kfree(b->legacy_io); /* both are allocated here */
659 }
660}
661#endif /* HAVE_PCI_LEGACY */
662
663#ifdef HAVE_PCI_MMAP
664
665int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma)
666{
667 unsigned long nr, start, size;
668
669 nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
670 start = vma->vm_pgoff;
671 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
672 if (start < size && size - start >= nr)
673 return 1;
674 WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n",
675 current->comm, start, start+nr, pci_name(pdev), resno, size);
676 return 0;
677}
678
679/**
680 * pci_mmap_resource - map a PCI resource into user memory space
681 * @kobj: kobject for mapping
682 * @attr: struct bin_attribute for the file being mapped
683 * @vma: struct vm_area_struct passed into the mmap
684 * @write_combine: 1 for write_combine mapping
685 *
686 * Use the regular PCI mapping routines to map a PCI resource into userspace.
687 */
688static int
689pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
690 struct vm_area_struct *vma, int write_combine)
691{
692 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
693 struct device, kobj));
694 struct resource *res = (struct resource *)attr->private;
695 enum pci_mmap_state mmap_type;
696 resource_size_t start, end;
697 int i;
698
699 for (i = 0; i < PCI_ROM_RESOURCE; i++)
700 if (res == &pdev->resource[i])
701 break;
702 if (i >= PCI_ROM_RESOURCE)
703 return -ENODEV;
704
705 if (!pci_mmap_fits(pdev, i, vma))
706 return -EINVAL;
707
708 /* pci_mmap_page_range() expects the same kind of entry as coming
709 * from /proc/bus/pci/ which is a "user visible" value. If this is
710 * different from the resource itself, arch will do necessary fixup.
711 */
712 pci_resource_to_user(pdev, i, res, &start, &end);
713 vma->vm_pgoff += start >> PAGE_SHIFT;
714 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
715
716 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
717 return -EINVAL;
718
719 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
720}
721
722static int
723pci_mmap_resource_uc(struct kobject *kobj, struct bin_attribute *attr,
724 struct vm_area_struct *vma)
725{
726 return pci_mmap_resource(kobj, attr, vma, 0);
727}
728
729static int
730pci_mmap_resource_wc(struct kobject *kobj, struct bin_attribute *attr,
731 struct vm_area_struct *vma)
732{
733 return pci_mmap_resource(kobj, attr, vma, 1);
734}
735
736/**
737 * pci_remove_resource_files - cleanup resource files
738 * @pdev: dev to cleanup
739 *
740 * If we created resource files for @pdev, remove them from sysfs and
741 * free their resources.
742 */
743static void
744pci_remove_resource_files(struct pci_dev *pdev)
745{
746 int i;
747
748 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
749 struct bin_attribute *res_attr;
750
751 res_attr = pdev->res_attr[i];
752 if (res_attr) {
753 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
754 kfree(res_attr);
755 }
756
757 res_attr = pdev->res_attr_wc[i];
758 if (res_attr) {
759 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
760 kfree(res_attr);
761 }
762 }
763}
764
765static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
766{
767 /* allocate attribute structure, piggyback attribute name */
768 int name_len = write_combine ? 13 : 10;
769 struct bin_attribute *res_attr;
770 int retval;
771
772 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
773 if (res_attr) {
774 char *res_attr_name = (char *)(res_attr + 1);
775
776 if (write_combine) {
777 pdev->res_attr_wc[num] = res_attr;
778 sprintf(res_attr_name, "resource%d_wc", num);
779 res_attr->mmap = pci_mmap_resource_wc;
780 } else {
781 pdev->res_attr[num] = res_attr;
782 sprintf(res_attr_name, "resource%d", num);
783 res_attr->mmap = pci_mmap_resource_uc;
784 }
785 res_attr->attr.name = res_attr_name;
786 res_attr->attr.mode = S_IRUSR | S_IWUSR;
787 res_attr->size = pci_resource_len(pdev, num);
788 res_attr->private = &pdev->resource[num];
789 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
790 } else
791 retval = -ENOMEM;
792
793 return retval;
794}
795
796/**
797 * pci_create_resource_files - create resource files in sysfs for @dev
798 * @pdev: dev in question
799 *
800 * Walk the resources in @pdev creating files for each resource available.
801 */
802static int pci_create_resource_files(struct pci_dev *pdev)
803{
804 int i;
805 int retval;
806
807 /* Expose the PCI resources from this device as files */
808 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
809
810 /* skip empty resources */
811 if (!pci_resource_len(pdev, i))
812 continue;
813
814 retval = pci_create_attr(pdev, i, 0);
815 /* for prefetchable resources, create a WC mappable file */
816 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
817 retval = pci_create_attr(pdev, i, 1);
818
819 if (retval) {
820 pci_remove_resource_files(pdev);
821 return retval;
822 }
823 }
824 return 0;
825}
826#else /* !HAVE_PCI_MMAP */
827int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
828void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
829#endif /* HAVE_PCI_MMAP */
830
831/**
832 * pci_write_rom - used to enable access to the PCI ROM display
833 * @kobj: kernel object handle
834 * @bin_attr: struct bin_attribute for this file
835 * @buf: user input
836 * @off: file offset
837 * @count: number of byte in input
838 *
839 * writing anything except 0 enables it
840 */
841static ssize_t
842pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
843 char *buf, loff_t off, size_t count)
844{
845 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
846
847 if ((off == 0) && (*buf == '0') && (count == 2))
848 pdev->rom_attr_enabled = 0;
849 else
850 pdev->rom_attr_enabled = 1;
851
852 return count;
853}
854
855/**
856 * pci_read_rom - read a PCI ROM
857 * @kobj: kernel object handle
858 * @bin_attr: struct bin_attribute for this file
859 * @buf: where to put the data we read from the ROM
860 * @off: file offset
861 * @count: number of bytes to read
862 *
863 * Put @count bytes starting at @off into @buf from the ROM in the PCI
864 * device corresponding to @kobj.
865 */
866static ssize_t
867pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
868 char *buf, loff_t off, size_t count)
869{
870 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
871 void __iomem *rom;
872 size_t size;
873
874 if (!pdev->rom_attr_enabled)
875 return -EINVAL;
876
877 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
878 if (!rom || !size)
879 return -EIO;
880
881 if (off >= size)
882 count = 0;
883 else {
884 if (off + count > size)
885 count = size - off;
886
887 memcpy_fromio(buf, rom + off, count);
888 }
889 pci_unmap_rom(pdev, rom);
890
891 return count;
892}
893
894static struct bin_attribute pci_config_attr = {
895 .attr = {
896 .name = "config",
897 .mode = S_IRUGO | S_IWUSR,
898 },
899 .size = PCI_CFG_SPACE_SIZE,
900 .read = pci_read_config,
901 .write = pci_write_config,
902};
903
904static struct bin_attribute pcie_config_attr = {
905 .attr = {
906 .name = "config",
907 .mode = S_IRUGO | S_IWUSR,
908 },
909 .size = PCI_CFG_SPACE_EXP_SIZE,
910 .read = pci_read_config,
911 .write = pci_write_config,
912};
913
914int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
915{
916 return 0;
917}
918
919static ssize_t reset_store(struct device *dev,
920 struct device_attribute *attr, const char *buf,
921 size_t count)
922{
923 struct pci_dev *pdev = to_pci_dev(dev);
924 unsigned long val;
925 ssize_t result = strict_strtoul(buf, 0, &val);
926
927 if (result < 0)
928 return result;
929
930 if (val != 1)
931 return -EINVAL;
932 return pci_reset_function(pdev);
933}
934
935static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
936
937static int pci_create_capabilities_sysfs(struct pci_dev *dev)
938{
939 int retval;
940 struct bin_attribute *attr;
941
942 /* If the device has VPD, try to expose it in sysfs. */
943 if (dev->vpd) {
944 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
945 if (!attr)
946 return -ENOMEM;
947
948 attr->size = dev->vpd->len;
949 attr->attr.name = "vpd";
950 attr->attr.mode = S_IRUSR | S_IWUSR;
951 attr->read = read_vpd_attr;
952 attr->write = write_vpd_attr;
953 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
954 if (retval) {
955 kfree(dev->vpd->attr);
956 return retval;
957 }
958 dev->vpd->attr = attr;
959 }
960
961 /* Active State Power Management */
962 pcie_aspm_create_sysfs_dev_files(dev);
963
964 if (!pci_probe_reset_function(dev)) {
965 retval = device_create_file(&dev->dev, &reset_attr);
966 if (retval)
967 goto error;
968 dev->reset_fn = 1;
969 }
970 return 0;
971
972error:
973 pcie_aspm_remove_sysfs_dev_files(dev);
974 if (dev->vpd && dev->vpd->attr) {
975 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
976 kfree(dev->vpd->attr);
977 }
978
979 return retval;
980}
981
982int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
983{
984 int retval;
985 int rom_size = 0;
986 struct bin_attribute *attr;
987
988 if (!sysfs_initialized)
989 return -EACCES;
990
991 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
992 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
993 else
994 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
995 if (retval)
996 goto err;
997
998 retval = pci_create_resource_files(pdev);
999 if (retval)
1000 goto err_config_file;
1001
1002 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1003 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1004 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1005 rom_size = 0x20000;
1006
1007 /* If the device has a ROM, try to expose it in sysfs. */
1008 if (rom_size) {
1009 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1010 if (!attr) {
1011 retval = -ENOMEM;
1012 goto err_resource_files;
1013 }
1014 attr->size = rom_size;
1015 attr->attr.name = "rom";
1016 attr->attr.mode = S_IRUSR;
1017 attr->read = pci_read_rom;
1018 attr->write = pci_write_rom;
1019 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1020 if (retval) {
1021 kfree(attr);
1022 goto err_resource_files;
1023 }
1024 pdev->rom_attr = attr;
1025 }
1026
1027 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1028 retval = device_create_file(&pdev->dev, &vga_attr);
1029 if (retval)
1030 goto err_rom_file;
1031 }
1032
1033 /* add platform-specific attributes */
1034 retval = pcibios_add_platform_entries(pdev);
1035 if (retval)
1036 goto err_vga_file;
1037
1038 /* add sysfs entries for various capabilities */
1039 retval = pci_create_capabilities_sysfs(pdev);
1040 if (retval)
1041 goto err_vga_file;
1042
1043 return 0;
1044
1045err_vga_file:
1046 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1047 device_remove_file(&pdev->dev, &vga_attr);
1048err_rom_file:
1049 if (rom_size) {
1050 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1051 kfree(pdev->rom_attr);
1052 pdev->rom_attr = NULL;
1053 }
1054err_resource_files:
1055 pci_remove_resource_files(pdev);
1056err_config_file:
1057 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1058 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1059 else
1060 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1061err:
1062 return retval;
1063}
1064
1065static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1066{
1067 if (dev->vpd && dev->vpd->attr) {
1068 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1069 kfree(dev->vpd->attr);
1070 }
1071
1072 pcie_aspm_remove_sysfs_dev_files(dev);
1073 if (dev->reset_fn) {
1074 device_remove_file(&dev->dev, &reset_attr);
1075 dev->reset_fn = 0;
1076 }
1077}
1078
1079/**
1080 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1081 * @pdev: device whose entries we should free
1082 *
1083 * Cleanup when @pdev is removed from sysfs.
1084 */
1085void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1086{
1087 int rom_size = 0;
1088
1089 if (!sysfs_initialized)
1090 return;
1091
1092 pci_remove_capabilities_sysfs(pdev);
1093
1094 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1095 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1096 else
1097 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1098
1099 pci_remove_resource_files(pdev);
1100
1101 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1102 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1103 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1104 rom_size = 0x20000;
1105
1106 if (rom_size && pdev->rom_attr) {
1107 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1108 kfree(pdev->rom_attr);
1109 }
1110}
1111
1112static int __init pci_sysfs_init(void)
1113{
1114 struct pci_dev *pdev = NULL;
1115 int retval;
1116
1117 sysfs_initialized = 1;
1118 for_each_pci_dev(pdev) {
1119 retval = pci_create_sysfs_dev_files(pdev);
1120 if (retval) {
1121 pci_dev_put(pdev);
1122 return retval;
1123 }
1124 }
1125
1126 return 0;
1127}
1128
1129late_initcall(pci_sysfs_init);
Linux kernel - Deliverables
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