blob: 00a9947cb7cc6d0af342736ed121d46f14ee9caf [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>
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -070019#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/pci.h>
21#include <linux/stat.h>
22#include <linux/topology.h>
23#include <linux/mm.h>
Alexey Dobriyanaa0ac362007-07-15 23:40:39 -070024#include <linux/capability.h>
Shaohua Li7d715a62008-02-25 09:46:41 +080025#include <linux/pci-aspm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#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 \
Yani Ioannoue404e272005-05-17 06:42:58 -040033field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
Linus Torvalds1da177e2005-04-16 15:20:36 -070034{ \
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
Doug Thompsonbdee9d92006-06-14 16:59:48 -070048static 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 ssize_t consumed = -EINVAL;
62
63 if ((count > 0) && (*buf == '0' || *buf == '1')) {
64 pdev->broken_parity_status = *buf == '1' ? 1 : 0;
65 consumed = count;
66 }
67 return consumed;
68}
69
Alan Cox4327edf2005-09-10 00:25:49 -070070static ssize_t local_cpus_show(struct device *dev,
71 struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070072{
Alan Cox4327edf2005-09-10 00:25:49 -070073 cpumask_t mask;
74 int len;
75
76 mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
77 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
Mike Travis39106dc2008-04-08 11:43:03 -070078 buf[len++] = '\n';
79 buf[len] = '\0';
80 return len;
81}
82
83
84static ssize_t local_cpulist_show(struct device *dev,
85 struct device_attribute *attr, char *buf)
86{
87 cpumask_t mask;
88 int len;
89
90 mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
91 len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
92 buf[len++] = '\n';
93 buf[len] = '\0';
94 return len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095}
96
97/* show resources */
98static ssize_t
Yani Ioannoue404e272005-05-17 06:42:58 -040099resource_show(struct device * dev, struct device_attribute *attr, char * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100{
101 struct pci_dev * pci_dev = to_pci_dev(dev);
102 char * str = buf;
103 int i;
104 int max = 7;
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700105 resource_size_t start, end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
107 if (pci_dev->subordinate)
108 max = DEVICE_COUNT_RESOURCE;
109
110 for (i = 0; i < max; i++) {
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000111 struct resource *res = &pci_dev->resource[i];
112 pci_resource_to_user(pci_dev, i, res, &start, &end);
113 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
114 (unsigned long long)start,
115 (unsigned long long)end,
116 (unsigned long long)res->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 }
118 return (str - buf);
119}
120
Greg Kroah-Hartman87c8a442005-06-19 12:21:43 +0200121static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
Greg KH98885492005-05-05 11:57:25 -0700122{
123 struct pci_dev *pci_dev = to_pci_dev(dev);
124
125 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
126 pci_dev->vendor, pci_dev->device,
127 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
128 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
129 (u8)(pci_dev->class));
130}
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800131
132static ssize_t is_enabled_store(struct device *dev,
133 struct device_attribute *attr, const char *buf,
134 size_t count)
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200135{
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800136 ssize_t result = -EINVAL;
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200137 struct pci_dev *pdev = to_pci_dev(dev);
138
139 /* this can crash the machine when done on the "wrong" device */
140 if (!capable(CAP_SYS_ADMIN))
141 return count;
142
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800143 if (*buf == '0') {
144 if (atomic_read(&pdev->enable_cnt) != 0)
145 pci_disable_device(pdev);
146 else
147 result = -EIO;
148 } else if (*buf == '1')
149 result = pci_enable_device(pdev);
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200150
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800151 return result < 0 ? result : count;
152}
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200153
Inaky Perez-Gonzalezbae94d02006-11-22 12:40:31 -0800154static ssize_t is_enabled_show(struct device *dev,
155 struct device_attribute *attr, char *buf)
156{
157 struct pci_dev *pdev;
158
159 pdev = to_pci_dev (dev);
160 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200161}
162
Brice Goglin81bb0e12007-01-28 10:53:40 +0100163#ifdef CONFIG_NUMA
164static ssize_t
165numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
166{
167 return sprintf (buf, "%d\n", dev->numa_node);
168}
169#endif
170
Brice Goglinfe970642006-08-31 01:55:15 -0400171static ssize_t
172msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
173{
174 struct pci_dev *pdev = to_pci_dev(dev);
175
176 if (!pdev->subordinate)
177 return 0;
178
179 return sprintf (buf, "%u\n",
180 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
181}
182
183static ssize_t
184msi_bus_store(struct device *dev, struct device_attribute *attr,
185 const char *buf, size_t count)
186{
187 struct pci_dev *pdev = to_pci_dev(dev);
188
189 /* bad things may happen if the no_msi flag is changed
190 * while some drivers are loaded */
191 if (!capable(CAP_SYS_ADMIN))
192 return count;
193
194 if (!pdev->subordinate)
195 return count;
196
197 if (*buf == '0') {
198 pdev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
199 dev_warn(&pdev->dev, "forced subordinate bus to not support MSI,"
200 " bad things could happen.\n");
201 }
202
203 if (*buf == '1') {
204 pdev->subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
205 dev_warn(&pdev->dev, "forced subordinate bus to support MSI,"
206 " bad things could happen.\n");
207 }
208
209 return count;
210}
Greg KH98885492005-05-05 11:57:25 -0700211
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212struct device_attribute pci_dev_attrs[] = {
213 __ATTR_RO(resource),
214 __ATTR_RO(vendor),
215 __ATTR_RO(device),
216 __ATTR_RO(subsystem_vendor),
217 __ATTR_RO(subsystem_device),
218 __ATTR_RO(class),
219 __ATTR_RO(irq),
220 __ATTR_RO(local_cpus),
Mike Travis39106dc2008-04-08 11:43:03 -0700221 __ATTR_RO(local_cpulist),
Greg KH98885492005-05-05 11:57:25 -0700222 __ATTR_RO(modalias),
Brice Goglin81bb0e12007-01-28 10:53:40 +0100223#ifdef CONFIG_NUMA
224 __ATTR_RO(numa_node),
225#endif
Arjan van de Ven9f125d32006-04-29 10:59:08 +0200226 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
Doug Thompsonbdee9d92006-06-14 16:59:48 -0700227 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
228 broken_parity_status_show,broken_parity_status_store),
Brice Goglinfe970642006-08-31 01:55:15 -0400229 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 __ATTR_NULL,
231};
232
233static ssize_t
Zhang Rui91a69022007-06-09 13:57:22 +0800234pci_read_config(struct kobject *kobj, struct bin_attribute *bin_attr,
235 char *buf, loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236{
237 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
238 unsigned int size = 64;
239 loff_t init_off = off;
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900240 u8 *data = (u8*) buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
242 /* Several chips lock up trying to read undefined config space */
243 if (capable(CAP_SYS_ADMIN)) {
244 size = dev->cfg_size;
245 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
246 size = 128;
247 }
248
249 if (off > size)
250 return 0;
251 if (off + count > size) {
252 size -= off;
253 count = size;
254 } else {
255 size = count;
256 }
257
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900258 if ((off & 1) && size) {
259 u8 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700260 pci_user_read_config_byte(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900261 data[off - init_off] = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 off++;
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900263 size--;
264 }
265
266 if ((off & 3) && size > 2) {
267 u16 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700268 pci_user_read_config_word(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900269 data[off - init_off] = val & 0xff;
270 data[off - init_off + 1] = (val >> 8) & 0xff;
271 off += 2;
272 size -= 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 }
274
275 while (size > 3) {
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900276 u32 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700277 pci_user_read_config_dword(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900278 data[off - init_off] = val & 0xff;
279 data[off - init_off + 1] = (val >> 8) & 0xff;
280 data[off - init_off + 2] = (val >> 16) & 0xff;
281 data[off - init_off + 3] = (val >> 24) & 0xff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 off += 4;
283 size -= 4;
284 }
285
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900286 if (size >= 2) {
287 u16 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700288 pci_user_read_config_word(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900289 data[off - init_off] = val & 0xff;
290 data[off - init_off + 1] = (val >> 8) & 0xff;
291 off += 2;
292 size -= 2;
293 }
294
295 if (size > 0) {
296 u8 val;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700297 pci_user_read_config_byte(dev, off, &val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900298 data[off - init_off] = val;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 off++;
300 --size;
301 }
302
303 return count;
304}
305
306static ssize_t
Zhang Rui91a69022007-06-09 13:57:22 +0800307pci_write_config(struct kobject *kobj, struct bin_attribute *bin_attr,
308 char *buf, loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309{
310 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
311 unsigned int size = count;
312 loff_t init_off = off;
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900313 u8 *data = (u8*) buf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315 if (off > dev->cfg_size)
316 return 0;
317 if (off + count > dev->cfg_size) {
318 size = dev->cfg_size - off;
319 count = size;
320 }
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900321
322 if ((off & 1) && size) {
Brian Kinge04b0ea2005-09-27 01:21:55 -0700323 pci_user_write_config_byte(dev, off, data[off - init_off]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 off++;
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900325 size--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 }
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900327
328 if ((off & 3) && size > 2) {
329 u16 val = data[off - init_off];
330 val |= (u16) data[off - init_off + 1] << 8;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700331 pci_user_write_config_word(dev, off, val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900332 off += 2;
333 size -= 2;
334 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336 while (size > 3) {
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900337 u32 val = data[off - init_off];
338 val |= (u32) data[off - init_off + 1] << 8;
339 val |= (u32) data[off - init_off + 2] << 16;
340 val |= (u32) data[off - init_off + 3] << 24;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700341 pci_user_write_config_dword(dev, off, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 off += 4;
343 size -= 4;
344 }
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900345
346 if (size >= 2) {
347 u16 val = data[off - init_off];
348 val |= (u16) data[off - init_off + 1] << 8;
Brian Kinge04b0ea2005-09-27 01:21:55 -0700349 pci_user_write_config_word(dev, off, val);
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900350 off += 2;
351 size -= 2;
352 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
ssant@in.ibm.com4c0619a2005-04-08 14:53:31 +0900354 if (size) {
Brian Kinge04b0ea2005-09-27 01:21:55 -0700355 pci_user_write_config_byte(dev, off, data[off - init_off]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 off++;
357 --size;
358 }
359
360 return count;
361}
362
Ben Hutchings94e61082008-03-05 16:52:39 +0000363static ssize_t
364pci_read_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
365 char *buf, loff_t off, size_t count)
366{
367 struct pci_dev *dev =
368 to_pci_dev(container_of(kobj, struct device, kobj));
369 int end;
370 int ret;
371
372 if (off > bin_attr->size)
373 count = 0;
374 else if (count > bin_attr->size - off)
375 count = bin_attr->size - off;
376 end = off + count;
377
378 while (off < end) {
379 ret = dev->vpd->ops->read(dev, off, end - off, buf);
380 if (ret < 0)
381 return ret;
382 buf += ret;
383 off += ret;
384 }
385
386 return count;
387}
388
389static ssize_t
390pci_write_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
391 char *buf, loff_t off, size_t count)
392{
393 struct pci_dev *dev =
394 to_pci_dev(container_of(kobj, struct device, kobj));
395 int end;
396 int ret;
397
398 if (off > bin_attr->size)
399 count = 0;
400 else if (count > bin_attr->size - off)
401 count = bin_attr->size - off;
402 end = off + count;
403
404 while (off < end) {
405 ret = dev->vpd->ops->write(dev, off, end - off, buf);
406 if (ret < 0)
407 return ret;
408 buf += ret;
409 off += ret;
410 }
411
412 return count;
413}
414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415#ifdef HAVE_PCI_LEGACY
416/**
417 * pci_read_legacy_io - read byte(s) from legacy I/O port space
418 * @kobj: kobject corresponding to file to read from
419 * @buf: buffer to store results
420 * @off: offset into legacy I/O port space
421 * @count: number of bytes to read
422 *
423 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
424 * callback routine (pci_legacy_read).
425 */
426ssize_t
Zhang Rui91a69022007-06-09 13:57:22 +0800427pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
428 char *buf, loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429{
430 struct pci_bus *bus = to_pci_bus(container_of(kobj,
Greg Kroah-Hartmanfd7d1ce2007-05-22 22:47:54 -0400431 struct device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 kobj));
433
434 /* Only support 1, 2 or 4 byte accesses */
435 if (count != 1 && count != 2 && count != 4)
436 return -EINVAL;
437
438 return pci_legacy_read(bus, off, (u32 *)buf, count);
439}
440
441/**
442 * pci_write_legacy_io - write byte(s) to legacy I/O port space
443 * @kobj: kobject corresponding to file to read from
444 * @buf: buffer containing value to be written
445 * @off: offset into legacy I/O port space
446 * @count: number of bytes to write
447 *
448 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
449 * callback routine (pci_legacy_write).
450 */
451ssize_t
Zhang Rui91a69022007-06-09 13:57:22 +0800452pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
453 char *buf, loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454{
455 struct pci_bus *bus = to_pci_bus(container_of(kobj,
Greg Kroah-Hartmanfd7d1ce2007-05-22 22:47:54 -0400456 struct device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 kobj));
458 /* Only support 1, 2 or 4 byte accesses */
459 if (count != 1 && count != 2 && count != 4)
460 return -EINVAL;
461
462 return pci_legacy_write(bus, off, *(u32 *)buf, count);
463}
464
465/**
466 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
467 * @kobj: kobject corresponding to device to be mapped
468 * @attr: struct bin_attribute for this file
469 * @vma: struct vm_area_struct passed to mmap
470 *
471 * Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap
472 * legacy memory space (first meg of bus space) into application virtual
473 * memory space.
474 */
475int
476pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
477 struct vm_area_struct *vma)
478{
479 struct pci_bus *bus = to_pci_bus(container_of(kobj,
Greg Kroah-Hartmanfd7d1ce2007-05-22 22:47:54 -0400480 struct device,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 kobj));
482
483 return pci_mmap_legacy_page_range(bus, vma);
484}
485#endif /* HAVE_PCI_LEGACY */
486
487#ifdef HAVE_PCI_MMAP
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700488
489static int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma)
490{
491 unsigned long nr, start, size;
492
493 nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
494 start = vma->vm_pgoff;
495 size = pci_resource_len(pdev, resno) >> PAGE_SHIFT;
496 if (start < size && size - start >= nr)
497 return 1;
498 WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n",
499 current->comm, start, start+nr, pci_name(pdev), resno, size);
500 return 0;
501}
502
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503/**
504 * pci_mmap_resource - map a PCI resource into user memory space
505 * @kobj: kobject for mapping
506 * @attr: struct bin_attribute for the file being mapped
507 * @vma: struct vm_area_struct passed into the mmap
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700508 * @write_combine: 1 for write_combine mapping
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 *
510 * Use the regular PCI mapping routines to map a PCI resource into userspace.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 */
512static int
513pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700514 struct vm_area_struct *vma, int write_combine)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515{
516 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
517 struct device, kobj));
518 struct resource *res = (struct resource *)attr->private;
519 enum pci_mmap_state mmap_type;
Greg Kroah-Hartmane31dd6e2006-06-12 17:06:02 -0700520 resource_size_t start, end;
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000521 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000523 for (i = 0; i < PCI_ROM_RESOURCE; i++)
524 if (res == &pdev->resource[i])
525 break;
526 if (i >= PCI_ROM_RESOURCE)
527 return -ENODEV;
528
Linus Torvaldsb5ff7df2008-10-02 18:52:51 -0700529 if (!pci_mmap_fits(pdev, i, vma))
530 return -EINVAL;
531
Michael Ellerman2311b1f2005-05-13 17:44:10 +1000532 /* pci_mmap_page_range() expects the same kind of entry as coming
533 * from /proc/bus/pci/ which is a "user visible" value. If this is
534 * different from the resource itself, arch will do necessary fixup.
535 */
536 pci_resource_to_user(pdev, i, res, &start, &end);
537 vma->vm_pgoff += start >> PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
539
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700540 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
541}
542
543static int
544pci_mmap_resource_uc(struct kobject *kobj, struct bin_attribute *attr,
545 struct vm_area_struct *vma)
546{
547 return pci_mmap_resource(kobj, attr, vma, 0);
548}
549
550static int
551pci_mmap_resource_wc(struct kobject *kobj, struct bin_attribute *attr,
552 struct vm_area_struct *vma)
553{
554 return pci_mmap_resource(kobj, attr, vma, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555}
556
557/**
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700558 * pci_remove_resource_files - cleanup resource files
559 * @dev: dev to cleanup
560 *
561 * If we created resource files for @dev, remove them from sysfs and
562 * free their resources.
563 */
564static void
565pci_remove_resource_files(struct pci_dev *pdev)
566{
567 int i;
568
569 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
570 struct bin_attribute *res_attr;
571
572 res_attr = pdev->res_attr[i];
573 if (res_attr) {
574 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
575 kfree(res_attr);
576 }
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700577
578 res_attr = pdev->res_attr_wc[i];
579 if (res_attr) {
580 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
581 kfree(res_attr);
582 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700583 }
584}
585
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700586static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
587{
588 /* allocate attribute structure, piggyback attribute name */
589 int name_len = write_combine ? 13 : 10;
590 struct bin_attribute *res_attr;
591 int retval;
592
593 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
594 if (res_attr) {
595 char *res_attr_name = (char *)(res_attr + 1);
596
597 if (write_combine) {
598 pdev->res_attr_wc[num] = res_attr;
599 sprintf(res_attr_name, "resource%d_wc", num);
600 res_attr->mmap = pci_mmap_resource_wc;
601 } else {
602 pdev->res_attr[num] = res_attr;
603 sprintf(res_attr_name, "resource%d", num);
604 res_attr->mmap = pci_mmap_resource_uc;
605 }
606 res_attr->attr.name = res_attr_name;
607 res_attr->attr.mode = S_IRUSR | S_IWUSR;
608 res_attr->size = pci_resource_len(pdev, num);
609 res_attr->private = &pdev->resource[num];
610 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
611 } else
612 retval = -ENOMEM;
613
614 return retval;
615}
616
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700617/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 * pci_create_resource_files - create resource files in sysfs for @dev
619 * @dev: dev in question
620 *
621 * Walk the resources in @dev creating files for each resource available.
622 */
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700623static int pci_create_resource_files(struct pci_dev *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624{
625 int i;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700626 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
628 /* Expose the PCI resources from this device as files */
629 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
631 /* skip empty resources */
632 if (!pci_resource_len(pdev, i))
633 continue;
634
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700635 retval = pci_create_attr(pdev, i, 0);
636 /* for prefetchable resources, create a WC mappable file */
637 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
638 retval = pci_create_attr(pdev, i, 1);
Dmitry Torokhovd48593b2005-04-29 00:58:46 -0500639
venkatesh.pallipadi@intel.com45aec1ae2008-03-18 17:00:22 -0700640 if (retval) {
641 pci_remove_resource_files(pdev);
642 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 }
644 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700645 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646}
647#else /* !HAVE_PCI_MMAP */
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700648static inline int pci_create_resource_files(struct pci_dev *dev) { return 0; }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649static inline void pci_remove_resource_files(struct pci_dev *dev) { return; }
650#endif /* HAVE_PCI_MMAP */
651
652/**
653 * pci_write_rom - used to enable access to the PCI ROM display
654 * @kobj: kernel object handle
655 * @buf: user input
656 * @off: file offset
657 * @count: number of byte in input
658 *
659 * writing anything except 0 enables it
660 */
661static ssize_t
Zhang Rui91a69022007-06-09 13:57:22 +0800662pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
663 char *buf, loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664{
665 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
666
667 if ((off == 0) && (*buf == '0') && (count == 2))
668 pdev->rom_attr_enabled = 0;
669 else
670 pdev->rom_attr_enabled = 1;
671
672 return count;
673}
674
675/**
676 * pci_read_rom - read a PCI ROM
677 * @kobj: kernel object handle
678 * @buf: where to put the data we read from the ROM
679 * @off: file offset
680 * @count: number of bytes to read
681 *
682 * Put @count bytes starting at @off into @buf from the ROM in the PCI
683 * device corresponding to @kobj.
684 */
685static ssize_t
Zhang Rui91a69022007-06-09 13:57:22 +0800686pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
687 char *buf, loff_t off, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688{
689 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
690 void __iomem *rom;
691 size_t size;
692
693 if (!pdev->rom_attr_enabled)
694 return -EINVAL;
695
696 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
697 if (!rom)
698 return 0;
699
700 if (off >= size)
701 count = 0;
702 else {
703 if (off + count > size)
704 count = size - off;
705
706 memcpy_fromio(buf, rom + off, count);
707 }
708 pci_unmap_rom(pdev, rom);
709
710 return count;
711}
712
713static struct bin_attribute pci_config_attr = {
714 .attr = {
715 .name = "config",
716 .mode = S_IRUGO | S_IWUSR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 },
Zhao, Yu557848c2008-10-13 19:18:07 +0800718 .size = PCI_CFG_SPACE_SIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 .read = pci_read_config,
720 .write = pci_write_config,
721};
722
723static struct bin_attribute pcie_config_attr = {
724 .attr = {
725 .name = "config",
726 .mode = S_IRUGO | S_IWUSR,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 },
Zhao, Yu557848c2008-10-13 19:18:07 +0800728 .size = PCI_CFG_SPACE_EXP_SIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 .read = pci_read_config,
730 .write = pci_write_config,
731};
732
Michael Ellermana2cd52c2007-05-08 12:03:08 +1000733int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
Michael Ellerman575e3342007-05-08 12:03:07 +1000734{
Michael Ellermana2cd52c2007-05-08 12:03:08 +1000735 return 0;
Michael Ellerman575e3342007-05-08 12:03:07 +1000736}
737
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700738int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739{
Ben Hutchings94e61082008-03-05 16:52:39 +0000740 struct bin_attribute *attr = NULL;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700741 int retval;
742
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 if (!sysfs_initialized)
744 return -EACCES;
745
Zhao, Yu557848c2008-10-13 19:18:07 +0800746 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700747 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 else
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700749 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
750 if (retval)
751 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
Ben Hutchings94e61082008-03-05 16:52:39 +0000753 /* If the device has VPD, try to expose it in sysfs. */
754 if (pdev->vpd) {
755 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
756 if (attr) {
757 pdev->vpd->attr = attr;
Benjamin Li99cb233d2008-07-02 10:59:04 -0700758 attr->size = pdev->vpd->len;
Ben Hutchings94e61082008-03-05 16:52:39 +0000759 attr->attr.name = "vpd";
Ben Hutchingsa94c2482008-07-01 17:18:17 +0100760 attr->attr.mode = S_IRUSR | S_IWUSR;
Ben Hutchings94e61082008-03-05 16:52:39 +0000761 attr->read = pci_read_vpd;
762 attr->write = pci_write_vpd;
763 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
764 if (retval)
765 goto err_vpd;
766 } else {
767 retval = -ENOMEM;
768 goto err_config_file;
769 }
770 }
771
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700772 retval = pci_create_resource_files(pdev);
773 if (retval)
Ben Hutchings94e61082008-03-05 16:52:39 +0000774 goto err_vpd_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
776 /* If the device has a ROM, try to expose it in sysfs. */
Jesse Barnes40ee9e92007-03-24 11:03:32 -0700777 if (pci_resource_len(pdev, PCI_ROM_RESOURCE) ||
778 (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)) {
Ben Hutchings94e61082008-03-05 16:52:39 +0000779 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
780 if (attr) {
781 pdev->rom_attr = attr;
782 attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
783 attr->attr.name = "rom";
784 attr->attr.mode = S_IRUSR;
785 attr->read = pci_read_rom;
786 attr->write = pci_write_rom;
787 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700788 if (retval)
789 goto err_rom;
790 } else {
791 retval = -ENOMEM;
Michael Ellerman9890b122007-04-18 13:34:12 +1000792 goto err_resource_files;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 }
794 }
795 /* add platform-specific attributes */
Michael Ellermana2cd52c2007-05-08 12:03:08 +1000796 if (pcibios_add_platform_entries(pdev))
797 goto err_rom_file;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700798
Shaohua Li7d715a62008-02-25 09:46:41 +0800799 pcie_aspm_create_sysfs_dev_files(pdev);
800
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 return 0;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700802
Michael Ellermana2cd52c2007-05-08 12:03:08 +1000803err_rom_file:
804 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
Ben Hutchings94e61082008-03-05 16:52:39 +0000805 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700806err_rom:
Ben Hutchings94e61082008-03-05 16:52:39 +0000807 kfree(pdev->rom_attr);
Michael Ellerman9890b122007-04-18 13:34:12 +1000808err_resource_files:
809 pci_remove_resource_files(pdev);
Ben Hutchings94e61082008-03-05 16:52:39 +0000810err_vpd_file:
811 if (pdev->vpd) {
812 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->vpd->attr);
813err_vpd:
814 kfree(pdev->vpd->attr);
815 }
816err_config_file:
Zhao, Yu557848c2008-10-13 19:18:07 +0800817 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700818 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
819 else
820 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
821err:
822 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823}
824
825/**
826 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
827 * @pdev: device whose entries we should free
828 *
829 * Cleanup when @pdev is removed from sysfs.
830 */
831void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
832{
David Millerd67afe52006-11-10 12:27:48 -0800833 if (!sysfs_initialized)
834 return;
835
Shaohua Li7d715a62008-02-25 09:46:41 +0800836 pcie_aspm_remove_sysfs_dev_files(pdev);
837
Ben Hutchings94e61082008-03-05 16:52:39 +0000838 if (pdev->vpd) {
839 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->vpd->attr);
840 kfree(pdev->vpd->attr);
841 }
Zhao, Yu557848c2008-10-13 19:18:07 +0800842 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
844 else
845 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
846
847 pci_remove_resource_files(pdev);
848
849 if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
850 if (pdev->rom_attr) {
851 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
852 kfree(pdev->rom_attr);
853 }
854 }
855}
856
857static int __init pci_sysfs_init(void)
858{
859 struct pci_dev *pdev = NULL;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700860 int retval;
861
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 sysfs_initialized = 1;
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700863 for_each_pci_dev(pdev) {
864 retval = pci_create_sysfs_dev_files(pdev);
Julia Lawall151fc5d2007-11-20 08:41:16 +0100865 if (retval) {
866 pci_dev_put(pdev);
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700867 return retval;
Julia Lawall151fc5d2007-11-20 08:41:16 +0100868 }
Greg Kroah-Hartmanb19441a2006-08-28 11:43:25 -0700869 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
871 return 0;
872}
873
Jesse Barnes40ee9e92007-03-24 11:03:32 -0700874late_initcall(pci_sysfs_init);