blob: 9c718583a237f4f6082e7dcc5e84e23e85ee651c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/kernel.h>
19#include <linux/pci.h>
20#include <linux/stat.h>
21#include <linux/topology.h>
22#include <linux/mm.h>
Alexey Dobriyanaa0ac362007-07-15 23:40:39 -070023#include <linux/capability.h>
Shaohua Li7d715a62008-02-25 09:46:41 +080024#include <linux/pci-aspm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include "pci.h"
26
27static int sysfs_initialized; /* = 0 */
28
29/* show configuration fields */
30#define pci_config_attr(field, format_string) \
31static ssize_t \
Yani Ioannoue404e272005-05-17 06:42:58 -040032field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
Linus Torvalds1da177e2005-04-16 15:20:36 -070033{ \
34 struct pci_dev *pdev; \
35 \
36 pdev = to_pci_dev (dev); \
37 return sprintf (buf, format_string, pdev->field); \
38}
39
40pci_config_attr(vendor, "0x%04x\n");
41pci_config_attr(device, "0x%04x\n");
42pci_config_attr(subsystem_vendor, "0x%04x\n");
43pci_config_attr(subsystem_device, "0x%04x\n");
44pci_config_attr(class, "0x%06x\n");
45pci_config_attr(irq, "%u\n");
46
Doug Thompsonbdee9d92006-06-14 16:59:48 -070047static ssize_t broken_parity_status_show(struct device *dev,
48 struct device_attribute *attr,
49 char *buf)
50{
51 struct pci_dev *pdev = to_pci_dev(dev);
52 return sprintf (buf, "%u\n", pdev->broken_parity_status);
53}
54
55static ssize_t broken_parity_status_store(struct device *dev,
56 struct device_attribute *attr,
57 const char *buf, size_t count)
58{
59 struct pci_dev *pdev = to_pci_dev(dev);
60 ssize_t consumed = -EINVAL;
61
62 if ((count > 0) && (*buf == '0' || *buf == '1')) {
63 pdev->broken_parity_status = *buf == '1' ? 1 : 0;
64 consumed = count;
65 }
66 return consumed;
67}
68
Alan Cox4327edf2005-09-10 00:25:49 -070069static ssize_t local_cpus_show(struct device *dev,
70 struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
Alan Cox4327edf2005-09-10 00:25:49 -070072 cpumask_t mask;
73 int len;
74
75 mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
76 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
Mike Travis39106dc2008-04-08 11:43:03 -070077 buf[len++] = '\n';
78 buf[len] = '\0';
79 return len;
80}
81
82
83static ssize_t local_cpulist_show(struct device *dev,
84 struct device_attribute *attr, char *buf)
85{
86 cpumask_t mask;
87 int len;
88
89 mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
90 len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
91 buf[len++] = '\n';
92 buf[len] = '\0';
93 return len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094}
95
96/* show resources */
97static ssize_t
Yani Ioannoue404e272005-05-17 06:42:58 -040098resource_show(struct device * dev, struct device_attribute *attr, char * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070099{
100 struct pci_dev * pci_dev = to_pci_dev(dev);
101 char * str = buf;
102 int i;
103 int max = 7;
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700104 resource_size_t start, end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106 if (pci_dev->subordinate)
107 max = DEVICE_COUNT_RESOURCE;
108
109 for (i = 0; i < max; i++) {
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000110 struct resource *res = &pci_dev->resource[i];
111 pci_resource_to_user(pci_dev, i, res, &start, &end);
112 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
113 (unsigned long long)start,
114 (unsigned long long)end,
115 (unsigned long long)res->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 }
117 return (str - buf);
118}
119
Greg Kroah-Hartman87c8a442005-06-19 12:21:43 +0200120static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
Greg KH98885492005-05-05 11:57:25 -0700121{
122 struct pci_dev *pci_dev = to_pci_dev(dev);
123
124 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
125 pci_dev->vendor, pci_dev->device,
126 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
127 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
128 (u8)(pci_dev->class));
129}
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800130
131static ssize_t is_enabled_store(struct device *dev,
132 struct device_attribute *attr, const char *buf,
133 size_t count)
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200134{
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800135 ssize_t result = -EINVAL;
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200136 struct pci_dev *pdev = to_pci_dev(dev);
137
138 /* this can crash the machine when done on the "wrong" device */
139 if (!capable(CAP_SYS_ADMIN))
140 return count;
141
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800142 if (*buf == '0') {
143 if (atomic_read(&pdev->enable_cnt) != 0)
144 pci_disable_device(pdev);
145 else
146 result = -EIO;
147 } else if (*buf == '1')
148 result = pci_enable_device(pdev);
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200149
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800150 return result < 0 ? result : count;
151}
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200152
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800153static ssize_t is_enabled_show(struct device *dev,
154 struct device_attribute *attr, char *buf)
155{
156 struct pci_dev *pdev;
157
158 pdev = to_pci_dev (dev);
159 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200160}
161
Brice Goglin81bb0e12007-01-28 10:53:40 +0100162#ifdef CONFIG_NUMA
163static ssize_t
164numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
165{
166 return sprintf (buf, "%d\n", dev->numa_node);
167}
168#endif
169
Brice Goglinfe970642006-08-31 01:55:15 -0400170static ssize_t
171msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
172{
173 struct pci_dev *pdev = to_pci_dev(dev);
174
175 if (!pdev->subordinate)
176 return 0;
177
178 return sprintf (buf, "%u\n",
179 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
180}
181
182static ssize_t
183msi_bus_store(struct device *dev, struct device_attribute *attr,
184 const char *buf, size_t count)
185{
186 struct pci_dev *pdev = to_pci_dev(dev);
187
188 /* bad things may happen if the no_msi flag is changed
189 * while some drivers are loaded */
190 if (!capable(CAP_SYS_ADMIN))
191 return count;
192
193 if (!pdev->subordinate)
194 return count;
195
196 if (*buf == '0') {
197 pdev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
198 dev_warn(&pdev->dev, "forced subordinate bus to not support MSI,"
199 " bad things could happen.\n");
200 }
201
202 if (*buf == '1') {
203 pdev->subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
204 dev_warn(&pdev->dev, "forced subordinate bus to support MSI,"
205 " bad things could happen.\n");
206 }
207
208 return count;
209}
Greg KH98885492005-05-05 11:57:25 -0700210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211struct device_attribute pci_dev_attrs[] = {
212 __ATTR_RO(resource),
213 __ATTR_RO(vendor),
214 __ATTR_RO(device),
215 __ATTR_RO(subsystem_vendor),
216 __ATTR_RO(subsystem_device),
217 __ATTR_RO(class),
218 __ATTR_RO(irq),
219 __ATTR_RO(local_cpus),
Mike Travis39106dc2008-04-08 11:43:03 -0700220 __ATTR_RO(local_cpulist),
Greg KH98885492005-05-05 11:57:25 -0700221 __ATTR_RO(modalias),
Brice Goglin81bb0e12007-01-28 10:53:40 +0100222#ifdef CONFIG_NUMA
223 __ATTR_RO(numa_node),
224#endif
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200225 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
Doug Thompsonbdee9d92006-06-14 16:59:48 -0700226 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
227 broken_parity_status_show,broken_parity_status_store),
Brice Goglinfe970642006-08-31 01:55:15 -0400228 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 __ATTR_NULL,
230};
231
232static ssize_t
Zhang Rui91a69022007-06-09 13:57:22 +0800233pci_read_config(struct kobject *kobj, struct bin_attribute *bin_attr,
234 char *buf, loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235{
236 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
237 unsigned int size = 64;
238 loff_t init_off = off;
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900239 u8 *data = (u8*) buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241 /* Several chips lock up trying to read undefined config space */
242 if (capable(CAP_SYS_ADMIN)) {
243 size = dev->cfg_size;
244 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
245 size = 128;
246 }
247
248 if (off > size)
249 return 0;
250 if (off + count > size) {
251 size -= off;
252 count = size;
253 } else {
254 size = count;
255 }
256
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900257 if ((off & 1) && size) {
258 u8 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700259 pci_user_read_config_byte(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900260 data[off - init_off] = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 off++;
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900262 size--;
263 }
264
265 if ((off & 3) && size > 2) {
266 u16 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700267 pci_user_read_config_word(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900268 data[off - init_off] = val & 0xff;
269 data[off - init_off + 1] = (val >> 8) & 0xff;
270 off += 2;
271 size -= 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273
274 while (size > 3) {
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900275 u32 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700276 pci_user_read_config_dword(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900277 data[off - init_off] = val & 0xff;
278 data[off - init_off + 1] = (val >> 8) & 0xff;
279 data[off - init_off + 2] = (val >> 16) & 0xff;
280 data[off - init_off + 3] = (val >> 24) & 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 off += 4;
282 size -= 4;
283 }
284
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900285 if (size >= 2) {
286 u16 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700287 pci_user_read_config_word(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900288 data[off - init_off] = val & 0xff;
289 data[off - init_off + 1] = (val >> 8) & 0xff;
290 off += 2;
291 size -= 2;
292 }
293
294 if (size > 0) {
295 u8 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700296 pci_user_read_config_byte(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900297 data[off - init_off] = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 off++;
299 --size;
300 }
301
302 return count;
303}
304
305static ssize_t
Zhang Rui91a69022007-06-09 13:57:22 +0800306pci_write_config(struct kobject *kobj, struct bin_attribute *bin_attr,
307 char *buf, loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308{
309 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
310 unsigned int size = count;
311 loff_t init_off = off;
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900312 u8 *data = (u8*) buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
314 if (off > dev->cfg_size)
315 return 0;
316 if (off + count > dev->cfg_size) {
317 size = dev->cfg_size - off;
318 count = size;
319 }
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900320
321 if ((off & 1) && size) {
Brian Kinge04b0ea2005-09-27 01:21:55 -0700322 pci_user_write_config_byte(dev, off, data[off - init_off]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 off++;
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900324 size--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 }
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900326
327 if ((off & 3) && size > 2) {
328 u16 val = data[off - init_off];
329 val |= (u16) data[off - init_off + 1] << 8;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700330 pci_user_write_config_word(dev, off, val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900331 off += 2;
332 size -= 2;
333 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
335 while (size > 3) {
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900336 u32 val = data[off - init_off];
337 val |= (u32) data[off - init_off + 1] << 8;
338 val |= (u32) data[off - init_off + 2] << 16;
339 val |= (u32) data[off - init_off + 3] << 24;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700340 pci_user_write_config_dword(dev, off, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 off += 4;
342 size -= 4;
343 }
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900344
345 if (size >= 2) {
346 u16 val = data[off - init_off];
347 val |= (u16) data[off - init_off + 1] << 8;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700348 pci_user_write_config_word(dev, off, val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900349 off += 2;
350 size -= 2;
351 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900353 if (size) {
Brian Kinge04b0ea2005-09-27 01:21:55 -0700354 pci_user_write_config_byte(dev, off, data[off - init_off]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 off++;
356 --size;
357 }
358
359 return count;
360}
361
Ben Hutchings94e61082008-03-05 16:52:39 +0000362static ssize_t
363pci_read_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
364 char *buf, loff_t off, size_t count)
365{
366 struct pci_dev *dev =
367 to_pci_dev(container_of(kobj, struct device, kobj));
368 int end;
369 int ret;
370
371 if (off > bin_attr->size)
372 count = 0;
373 else if (count > bin_attr->size - off)
374 count = bin_attr->size - off;
375 end = off + count;
376
377 while (off < end) {
378 ret = dev->vpd->ops->read(dev, off, end - off, buf);
379 if (ret < 0)
380 return ret;
381 buf += ret;
382 off += ret;
383 }
384
385 return count;
386}
387
388static ssize_t
389pci_write_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
390 char *buf, loff_t off, size_t count)
391{
392 struct pci_dev *dev =
393 to_pci_dev(container_of(kobj, struct device, kobj));
394 int end;
395 int ret;
396
397 if (off > bin_attr->size)
398 count = 0;
399 else if (count > bin_attr->size - off)
400 count = bin_attr->size - off;
401 end = off + count;
402
403 while (off < end) {
404 ret = dev->vpd->ops->write(dev, off, end - off, buf);
405 if (ret < 0)
406 return ret;
407 buf += ret;
408 off += ret;
409 }
410
411 return count;
412}
413
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414#ifdef HAVE_PCI_LEGACY
415/**
416 * pci_read_legacy_io - read byte(s) from legacy I/O port space
417 * @kobj: kobject corresponding to file to read from
418 * @buf: buffer to store results
419 * @off: offset into legacy I/O port space
420 * @count: number of bytes to read
421 *
422 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
423 * callback routine (pci_legacy_read).
424 */
425ssize_t
Zhang Rui91a69022007-06-09 13:57:22 +0800426pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
427 char *buf, loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428{
429 struct pci_bus *bus = to_pci_bus(container_of(kobj,
Greg Kroah-Hartmanfd7d1ce2007-05-22 22:47:54 -0400430 struct device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 kobj));
432
433 /* Only support 1, 2 or 4 byte accesses */
434 if (count != 1 && count != 2 && count != 4)
435 return -EINVAL;
436
437 return pci_legacy_read(bus, off, (u32 *)buf, count);
438}
439
440/**
441 * pci_write_legacy_io - write byte(s) to legacy I/O port space
442 * @kobj: kobject corresponding to file to read from
443 * @buf: buffer containing value to be written
444 * @off: offset into legacy I/O port space
445 * @count: number of bytes to write
446 *
447 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
448 * callback routine (pci_legacy_write).
449 */
450ssize_t
Zhang Rui91a69022007-06-09 13:57:22 +0800451pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
452 char *buf, loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
454 struct pci_bus *bus = to_pci_bus(container_of(kobj,
Greg Kroah-Hartmanfd7d1ce2007-05-22 22:47:54 -0400455 struct device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 kobj));
457 /* Only support 1, 2 or 4 byte accesses */
458 if (count != 1 && count != 2 && count != 4)
459 return -EINVAL;
460
461 return pci_legacy_write(bus, off, *(u32 *)buf, count);
462}
463
464/**
465 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
466 * @kobj: kobject corresponding to device to be mapped
467 * @attr: struct bin_attribute for this file
468 * @vma: struct vm_area_struct passed to mmap
469 *
470 * Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap
471 * legacy memory space (first meg of bus space) into application virtual
472 * memory space.
473 */
474int
475pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
476 struct vm_area_struct *vma)
477{
478 struct pci_bus *bus = to_pci_bus(container_of(kobj,
Greg Kroah-Hartmanfd7d1ce2007-05-22 22:47:54 -0400479 struct device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 kobj));
481
482 return pci_mmap_legacy_page_range(bus, vma);
483}
484#endif /* HAVE_PCI_LEGACY */
485
486#ifdef HAVE_PCI_MMAP
487/**
488 * pci_mmap_resource - map a PCI resource into user memory space
489 * @kobj: kobject for mapping
490 * @attr: struct bin_attribute for the file being mapped
491 * @vma: struct vm_area_struct passed into the mmap
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700492 * @write_combine: 1 for write_combine mapping
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 *
494 * Use the regular PCI mapping routines to map a PCI resource into userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 */
496static int
497pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700498 struct vm_area_struct *vma, int write_combine)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499{
500 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
501 struct device, kobj));
502 struct resource *res = (struct resource *)attr->private;
503 enum pci_mmap_state mmap_type;
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700504 resource_size_t start, end;
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000505 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000507 for (i = 0; i < PCI_ROM_RESOURCE; i++)
508 if (res == &pdev->resource[i])
509 break;
510 if (i >= PCI_ROM_RESOURCE)
511 return -ENODEV;
512
513 /* pci_mmap_page_range() expects the same kind of entry as coming
514 * from /proc/bus/pci/ which is a "user visible" value. If this is
515 * different from the resource itself, arch will do necessary fixup.
516 */
517 pci_resource_to_user(pdev, i, res, &start, &end);
518 vma->vm_pgoff += start >> PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
520
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700521 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
522}
523
524static int
525pci_mmap_resource_uc(struct kobject *kobj, struct bin_attribute *attr,
526 struct vm_area_struct *vma)
527{
528 return pci_mmap_resource(kobj, attr, vma, 0);
529}
530
531static int
532pci_mmap_resource_wc(struct kobject *kobj, struct bin_attribute *attr,
533 struct vm_area_struct *vma)
534{
535 return pci_mmap_resource(kobj, attr, vma, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536}
537
538/**
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700539 * pci_remove_resource_files - cleanup resource files
540 * @dev: dev to cleanup
541 *
542 * If we created resource files for @dev, remove them from sysfs and
543 * free their resources.
544 */
545static void
546pci_remove_resource_files(struct pci_dev *pdev)
547{
548 int i;
549
550 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
551 struct bin_attribute *res_attr;
552
553 res_attr = pdev->res_attr[i];
554 if (res_attr) {
555 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
556 kfree(res_attr);
557 }
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700558
559 res_attr = pdev->res_attr_wc[i];
560 if (res_attr) {
561 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
562 kfree(res_attr);
563 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700564 }
565}
566
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700567static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
568{
569 /* allocate attribute structure, piggyback attribute name */
570 int name_len = write_combine ? 13 : 10;
571 struct bin_attribute *res_attr;
572 int retval;
573
574 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
575 if (res_attr) {
576 char *res_attr_name = (char *)(res_attr + 1);
577
578 if (write_combine) {
579 pdev->res_attr_wc[num] = res_attr;
580 sprintf(res_attr_name, "resource%d_wc", num);
581 res_attr->mmap = pci_mmap_resource_wc;
582 } else {
583 pdev->res_attr[num] = res_attr;
584 sprintf(res_attr_name, "resource%d", num);
585 res_attr->mmap = pci_mmap_resource_uc;
586 }
587 res_attr->attr.name = res_attr_name;
588 res_attr->attr.mode = S_IRUSR | S_IWUSR;
589 res_attr->size = pci_resource_len(pdev, num);
590 res_attr->private = &pdev->resource[num];
591 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
592 } else
593 retval = -ENOMEM;
594
595 return retval;
596}
597
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700598/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 * pci_create_resource_files - create resource files in sysfs for @dev
600 * @dev: dev in question
601 *
602 * Walk the resources in @dev creating files for each resource available.
603 */
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700604static int pci_create_resource_files(struct pci_dev *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605{
606 int i;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700607 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
609 /* Expose the PCI resources from this device as files */
610 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
612 /* skip empty resources */
613 if (!pci_resource_len(pdev, i))
614 continue;
615
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700616 retval = pci_create_attr(pdev, i, 0);
617 /* for prefetchable resources, create a WC mappable file */
618 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
619 retval = pci_create_attr(pdev, i, 1);
Dmitry Torokhovd48593b2005-04-29 00:58:46 -0500620
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700621 if (retval) {
622 pci_remove_resource_files(pdev);
623 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 }
625 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700626 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627}
628#else /* !HAVE_PCI_MMAP */
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700629static inline int pci_create_resource_files(struct pci_dev *dev) { return 0; }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630static inline void pci_remove_resource_files(struct pci_dev *dev) { return; }
631#endif /* HAVE_PCI_MMAP */
632
633/**
634 * pci_write_rom - used to enable access to the PCI ROM display
635 * @kobj: kernel object handle
636 * @buf: user input
637 * @off: file offset
638 * @count: number of byte in input
639 *
640 * writing anything except 0 enables it
641 */
642static ssize_t
Zhang Rui91a69022007-06-09 13:57:22 +0800643pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
644 char *buf, loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645{
646 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
647
648 if ((off == 0) && (*buf == '0') && (count == 2))
649 pdev->rom_attr_enabled = 0;
650 else
651 pdev->rom_attr_enabled = 1;
652
653 return count;
654}
655
656/**
657 * pci_read_rom - read a PCI ROM
658 * @kobj: kernel object handle
659 * @buf: where to put the data we read from the ROM
660 * @off: file offset
661 * @count: number of bytes to read
662 *
663 * Put @count bytes starting at @off into @buf from the ROM in the PCI
664 * device corresponding to @kobj.
665 */
666static ssize_t
Zhang Rui91a69022007-06-09 13:57:22 +0800667pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
668 char *buf, loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669{
670 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
671 void __iomem *rom;
672 size_t size;
673
674 if (!pdev->rom_attr_enabled)
675 return -EINVAL;
676
677 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
678 if (!rom)
679 return 0;
680
681 if (off >= size)
682 count = 0;
683 else {
684 if (off + count > size)
685 count = size - off;
686
687 memcpy_fromio(buf, rom + off, count);
688 }
689 pci_unmap_rom(pdev, rom);
690
691 return count;
692}
693
694static struct bin_attribute pci_config_attr = {
695 .attr = {
696 .name = "config",
697 .mode = S_IRUGO | S_IWUSR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 },
699 .size = 256,
700 .read = pci_read_config,
701 .write = pci_write_config,
702};
703
704static struct bin_attribute pcie_config_attr = {
705 .attr = {
706 .name = "config",
707 .mode = S_IRUGO | S_IWUSR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 },
709 .size = 4096,
710 .read = pci_read_config,
711 .write = pci_write_config,
712};
713
Michael Ellermana2cd52c2007-05-08 12:03:08 +1000714int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
Michael Ellerman575e3342007-05-08 12:03:07 +1000715{
Michael Ellermana2cd52c2007-05-08 12:03:08 +1000716 return 0;
Michael Ellerman575e3342007-05-08 12:03:07 +1000717}
718
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700719int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720{
Ben Hutchings94e61082008-03-05 16:52:39 +0000721 struct bin_attribute *attr = NULL;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700722 int retval;
723
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 if (!sysfs_initialized)
725 return -EACCES;
726
727 if (pdev->cfg_size < 4096)
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700728 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 else
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700730 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
731 if (retval)
732 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Ben Hutchings94e61082008-03-05 16:52:39 +0000734 /* If the device has VPD, try to expose it in sysfs. */
735 if (pdev->vpd) {
736 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
737 if (attr) {
738 pdev->vpd->attr = attr;
Benjamin Li99cb233d2008-07-02 10:59:04 -0700739 attr->size = pdev->vpd->len;
Ben Hutchings94e61082008-03-05 16:52:39 +0000740 attr->attr.name = "vpd";
Ben Hutchingsa94c2482008-07-01 17:18:17 +0100741 attr->attr.mode = S_IRUSR | S_IWUSR;
Ben Hutchings94e61082008-03-05 16:52:39 +0000742 attr->read = pci_read_vpd;
743 attr->write = pci_write_vpd;
744 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
745 if (retval)
746 goto err_vpd;
747 } else {
748 retval = -ENOMEM;
749 goto err_config_file;
750 }
751 }
752
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700753 retval = pci_create_resource_files(pdev);
754 if (retval)
Ben Hutchings94e61082008-03-05 16:52:39 +0000755 goto err_vpd_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756
757 /* If the device has a ROM, try to expose it in sysfs. */
Jesse Barnes40ee9e92007-03-24 11:03:32 -0700758 if (pci_resource_len(pdev, PCI_ROM_RESOURCE) ||
759 (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)) {
Ben Hutchings94e61082008-03-05 16:52:39 +0000760 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
761 if (attr) {
762 pdev->rom_attr = attr;
763 attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
764 attr->attr.name = "rom";
765 attr->attr.mode = S_IRUSR;
766 attr->read = pci_read_rom;
767 attr->write = pci_write_rom;
768 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700769 if (retval)
770 goto err_rom;
771 } else {
772 retval = -ENOMEM;
Michael Ellerman9890b122007-04-18 13:34:12 +1000773 goto err_resource_files;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 }
775 }
776 /* add platform-specific attributes */
Michael Ellermana2cd52c2007-05-08 12:03:08 +1000777 if (pcibios_add_platform_entries(pdev))
778 goto err_rom_file;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700779
Shaohua Li7d715a62008-02-25 09:46:41 +0800780 pcie_aspm_create_sysfs_dev_files(pdev);
781
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 return 0;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700783
Michael Ellermana2cd52c2007-05-08 12:03:08 +1000784err_rom_file:
785 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
Ben Hutchings94e61082008-03-05 16:52:39 +0000786 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700787err_rom:
Ben Hutchings94e61082008-03-05 16:52:39 +0000788 kfree(pdev->rom_attr);
Michael Ellerman9890b122007-04-18 13:34:12 +1000789err_resource_files:
790 pci_remove_resource_files(pdev);
Ben Hutchings94e61082008-03-05 16:52:39 +0000791err_vpd_file:
792 if (pdev->vpd) {
793 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->vpd->attr);
794err_vpd:
795 kfree(pdev->vpd->attr);
796 }
797err_config_file:
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700798 if (pdev->cfg_size < 4096)
799 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
800 else
801 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
802err:
803 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804}
805
806/**
807 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
808 * @pdev: device whose entries we should free
809 *
810 * Cleanup when @pdev is removed from sysfs.
811 */
812void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
813{
David Millerd67afe52006-11-10 12:27:48 -0800814 if (!sysfs_initialized)
815 return;
816
Shaohua Li7d715a62008-02-25 09:46:41 +0800817 pcie_aspm_remove_sysfs_dev_files(pdev);
818
Ben Hutchings94e61082008-03-05 16:52:39 +0000819 if (pdev->vpd) {
820 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->vpd->attr);
821 kfree(pdev->vpd->attr);
822 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 if (pdev->cfg_size < 4096)
824 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
825 else
826 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
827
828 pci_remove_resource_files(pdev);
829
830 if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
831 if (pdev->rom_attr) {
832 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
833 kfree(pdev->rom_attr);
834 }
835 }
836}
837
838static int __init pci_sysfs_init(void)
839{
840 struct pci_dev *pdev = NULL;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700841 int retval;
842
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 sysfs_initialized = 1;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700844 for_each_pci_dev(pdev) {
845 retval = pci_create_sysfs_dev_files(pdev);
Julia Lawall151fc5d2007-11-20 08:41:16 +0100846 if (retval) {
847 pci_dev_put(pdev);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700848 return retval;
Julia Lawall151fc5d2007-11-20 08:41:16 +0100849 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700850 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851
852 return 0;
853}
854
Jesse Barnes40ee9e92007-03-24 11:03:32 -0700855late_initcall(pci_sysfs_init);