ia64/linux-2.6.18-xen.hg

view drivers/pci/pci-sysfs.c @ 912:dd42cdb0ab89

[IA64] Build blktap2 driver by default in x86 builds.

add CONFIG_XEN_BLKDEV_TAP2=y to buildconfigs/linux-defconfig_xen_ia64.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Mon Jun 29 12:09:16 2009 +0900 (2009-06-29)
parents f77ac4979fae
children
line source
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 */
18 #include <linux/kernel.h>
19 #include <linux/pci.h>
20 #include <linux/stat.h>
21 #include <linux/topology.h>
22 #include <linux/mm.h>
24 #include "pci.h"
26 static int sysfs_initialized; /* = 0 */
28 /* show configuration fields */
29 #define pci_config_attr(field, format_string) \
30 static ssize_t \
31 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
32 { \
33 struct pci_dev *pdev; \
34 \
35 pdev = to_pci_dev (dev); \
36 return sprintf (buf, format_string, pdev->field); \
37 }
39 pci_config_attr(vendor, "0x%04x\n");
40 pci_config_attr(device, "0x%04x\n");
41 pci_config_attr(subsystem_vendor, "0x%04x\n");
42 pci_config_attr(subsystem_device, "0x%04x\n");
43 pci_config_attr(class, "0x%06x\n");
44 pci_config_attr(irq, "%u\n");
45 pci_config_attr(is_enabled, "%u\n");
47 static 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 }
55 static 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;
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 }
69 static ssize_t local_cpus_show(struct device *dev,
70 struct device_attribute *attr, char *buf)
71 {
72 cpumask_t mask;
73 int len;
75 mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
76 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
77 strcat(buf,"\n");
78 return 1+len;
79 }
81 /* show resources */
82 static ssize_t
83 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
84 {
85 struct pci_dev * pci_dev = to_pci_dev(dev);
86 char * str = buf;
87 int i;
88 int max;
89 resource_size_t start, end;
91 if (pci_dev->subordinate)
92 max = DEVICE_COUNT_RESOURCE;
93 else
94 max = PCI_BRIDGE_RESOURCES;
96 for (i = 0; i < max; i++) {
97 struct resource *res = &pci_dev->resource[i];
98 pci_resource_to_user(pci_dev, i, res, &start, &end);
99 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
100 (unsigned long long)start,
101 (unsigned long long)end,
102 (unsigned long long)res->flags);
103 }
104 return (str - buf);
105 }
107 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
108 {
109 struct pci_dev *pci_dev = to_pci_dev(dev);
111 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
112 pci_dev->vendor, pci_dev->device,
113 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
114 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
115 (u8)(pci_dev->class));
116 }
117 static ssize_t
118 is_enabled_store(struct device *dev, struct device_attribute *attr,
119 const char *buf, size_t count)
120 {
121 struct pci_dev *pdev = to_pci_dev(dev);
123 /* this can crash the machine when done on the "wrong" device */
124 if (!capable(CAP_SYS_ADMIN))
125 return count;
127 if (*buf == '0')
128 pci_disable_device(pdev);
130 if (*buf == '1')
131 pci_enable_device(pdev);
133 return count;
134 }
137 struct device_attribute pci_dev_attrs[] = {
138 __ATTR_RO(resource),
139 __ATTR_RO(vendor),
140 __ATTR_RO(device),
141 __ATTR_RO(subsystem_vendor),
142 __ATTR_RO(subsystem_device),
143 __ATTR_RO(class),
144 __ATTR_RO(irq),
145 __ATTR_RO(local_cpus),
146 __ATTR_RO(modalias),
147 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
148 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
149 broken_parity_status_show,broken_parity_status_store),
150 __ATTR_NULL,
151 };
153 static ssize_t
154 pci_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
155 {
156 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
157 unsigned int size = 64;
158 loff_t init_off = off;
159 u8 *data = (u8*) buf;
161 /* Several chips lock up trying to read undefined config space */
162 if (capable(CAP_SYS_ADMIN)) {
163 size = dev->cfg_size;
164 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
165 size = 128;
166 }
168 if (off > size)
169 return 0;
170 if (off + count > size) {
171 size -= off;
172 count = size;
173 } else {
174 size = count;
175 }
177 if ((off & 1) && size) {
178 u8 val;
179 pci_user_read_config_byte(dev, off, &val);
180 data[off - init_off] = val;
181 off++;
182 size--;
183 }
185 if ((off & 3) && size > 2) {
186 u16 val;
187 pci_user_read_config_word(dev, off, &val);
188 data[off - init_off] = val & 0xff;
189 data[off - init_off + 1] = (val >> 8) & 0xff;
190 off += 2;
191 size -= 2;
192 }
194 while (size > 3) {
195 u32 val;
196 pci_user_read_config_dword(dev, off, &val);
197 data[off - init_off] = val & 0xff;
198 data[off - init_off + 1] = (val >> 8) & 0xff;
199 data[off - init_off + 2] = (val >> 16) & 0xff;
200 data[off - init_off + 3] = (val >> 24) & 0xff;
201 off += 4;
202 size -= 4;
203 }
205 if (size >= 2) {
206 u16 val;
207 pci_user_read_config_word(dev, off, &val);
208 data[off - init_off] = val & 0xff;
209 data[off - init_off + 1] = (val >> 8) & 0xff;
210 off += 2;
211 size -= 2;
212 }
214 if (size > 0) {
215 u8 val;
216 pci_user_read_config_byte(dev, off, &val);
217 data[off - init_off] = val;
218 off++;
219 --size;
220 }
222 return count;
223 }
225 static ssize_t
226 pci_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
227 {
228 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
229 unsigned int size = count;
230 loff_t init_off = off;
231 u8 *data = (u8*) buf;
233 if (off > dev->cfg_size)
234 return 0;
235 if (off + count > dev->cfg_size) {
236 size = dev->cfg_size - off;
237 count = size;
238 }
240 if ((off & 1) && size) {
241 pci_user_write_config_byte(dev, off, data[off - init_off]);
242 off++;
243 size--;
244 }
246 if ((off & 3) && size > 2) {
247 u16 val = data[off - init_off];
248 val |= (u16) data[off - init_off + 1] << 8;
249 pci_user_write_config_word(dev, off, val);
250 off += 2;
251 size -= 2;
252 }
254 while (size > 3) {
255 u32 val = data[off - init_off];
256 val |= (u32) data[off - init_off + 1] << 8;
257 val |= (u32) data[off - init_off + 2] << 16;
258 val |= (u32) data[off - init_off + 3] << 24;
259 pci_user_write_config_dword(dev, off, val);
260 off += 4;
261 size -= 4;
262 }
264 if (size >= 2) {
265 u16 val = data[off - init_off];
266 val |= (u16) data[off - init_off + 1] << 8;
267 pci_user_write_config_word(dev, off, val);
268 off += 2;
269 size -= 2;
270 }
272 if (size) {
273 pci_user_write_config_byte(dev, off, data[off - init_off]);
274 off++;
275 --size;
276 }
278 return count;
279 }
281 #ifdef HAVE_PCI_LEGACY
282 /**
283 * pci_read_legacy_io - read byte(s) from legacy I/O port space
284 * @kobj: kobject corresponding to file to read from
285 * @buf: buffer to store results
286 * @off: offset into legacy I/O port space
287 * @count: number of bytes to read
288 *
289 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
290 * callback routine (pci_legacy_read).
291 */
292 ssize_t
293 pci_read_legacy_io(struct kobject *kobj, char *buf, loff_t off, size_t count)
294 {
295 struct pci_bus *bus = to_pci_bus(container_of(kobj,
296 struct class_device,
297 kobj));
299 /* Only support 1, 2 or 4 byte accesses */
300 if (count != 1 && count != 2 && count != 4)
301 return -EINVAL;
303 return pci_legacy_read(bus, off, (u32 *)buf, count);
304 }
306 /**
307 * pci_write_legacy_io - write byte(s) to legacy I/O port space
308 * @kobj: kobject corresponding to file to read from
309 * @buf: buffer containing value to be written
310 * @off: offset into legacy I/O port space
311 * @count: number of bytes to write
312 *
313 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
314 * callback routine (pci_legacy_write).
315 */
316 ssize_t
317 pci_write_legacy_io(struct kobject *kobj, char *buf, loff_t off, size_t count)
318 {
319 struct pci_bus *bus = to_pci_bus(container_of(kobj,
320 struct class_device,
321 kobj));
322 /* Only support 1, 2 or 4 byte accesses */
323 if (count != 1 && count != 2 && count != 4)
324 return -EINVAL;
326 return pci_legacy_write(bus, off, *(u32 *)buf, count);
327 }
329 /**
330 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
331 * @kobj: kobject corresponding to device to be mapped
332 * @attr: struct bin_attribute for this file
333 * @vma: struct vm_area_struct passed to mmap
334 *
335 * Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap
336 * legacy memory space (first meg of bus space) into application virtual
337 * memory space.
338 */
339 int
340 pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
341 struct vm_area_struct *vma)
342 {
343 struct pci_bus *bus = to_pci_bus(container_of(kobj,
344 struct class_device,
345 kobj));
347 return pci_mmap_legacy_page_range(bus, vma);
348 }
349 #endif /* HAVE_PCI_LEGACY */
351 #ifdef HAVE_PCI_MMAP
352 /**
353 * pci_mmap_resource - map a PCI resource into user memory space
354 * @kobj: kobject for mapping
355 * @attr: struct bin_attribute for the file being mapped
356 * @vma: struct vm_area_struct passed into the mmap
357 *
358 * Use the regular PCI mapping routines to map a PCI resource into userspace.
359 * FIXME: write combining? maybe automatic for prefetchable regions?
360 */
361 static int
362 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
363 struct vm_area_struct *vma)
364 {
365 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
366 struct device, kobj));
367 struct resource *res = (struct resource *)attr->private;
368 enum pci_mmap_state mmap_type;
369 resource_size_t start, end;
370 int i;
372 for (i = 0; i < PCI_ROM_RESOURCE; i++)
373 if (res == &pdev->resource[i])
374 break;
375 if (i >= PCI_ROM_RESOURCE)
376 return -ENODEV;
378 /* pci_mmap_page_range() expects the same kind of entry as coming
379 * from /proc/bus/pci/ which is a "user visible" value. If this is
380 * different from the resource itself, arch will do necessary fixup.
381 */
382 pci_resource_to_user(pdev, i, res, &start, &end);
383 vma->vm_pgoff += start >> PAGE_SHIFT;
384 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
386 return pci_mmap_page_range(pdev, vma, mmap_type, 0);
387 }
389 /**
390 * pci_create_resource_files - create resource files in sysfs for @dev
391 * @dev: dev in question
392 *
393 * Walk the resources in @dev creating files for each resource available.
394 */
395 static void
396 pci_create_resource_files(struct pci_dev *pdev)
397 {
398 int i;
400 /* Expose the PCI resources from this device as files */
401 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
402 struct bin_attribute *res_attr;
404 /* skip empty resources */
405 if (!pci_resource_len(pdev, i))
406 continue;
408 /* allocate attribute structure, piggyback attribute name */
409 res_attr = kzalloc(sizeof(*res_attr) + 10, GFP_ATOMIC);
410 if (res_attr) {
411 char *res_attr_name = (char *)(res_attr + 1);
413 pdev->res_attr[i] = res_attr;
414 sprintf(res_attr_name, "resource%d", i);
415 res_attr->attr.name = res_attr_name;
416 res_attr->attr.mode = S_IRUSR | S_IWUSR;
417 res_attr->attr.owner = THIS_MODULE;
418 res_attr->size = pci_resource_len(pdev, i);
419 res_attr->mmap = pci_mmap_resource;
420 res_attr->private = &pdev->resource[i];
421 sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
422 }
423 }
424 }
426 /**
427 * pci_remove_resource_files - cleanup resource files
428 * @dev: dev to cleanup
429 *
430 * If we created resource files for @dev, remove them from sysfs and
431 * free their resources.
432 */
433 static void
434 pci_remove_resource_files(struct pci_dev *pdev)
435 {
436 int i;
438 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
439 struct bin_attribute *res_attr;
441 res_attr = pdev->res_attr[i];
442 if (res_attr) {
443 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
444 kfree(res_attr);
445 }
446 }
447 }
448 #else /* !HAVE_PCI_MMAP */
449 static inline void pci_create_resource_files(struct pci_dev *dev) { return; }
450 static inline void pci_remove_resource_files(struct pci_dev *dev) { return; }
451 #endif /* HAVE_PCI_MMAP */
453 /**
454 * pci_write_rom - used to enable access to the PCI ROM display
455 * @kobj: kernel object handle
456 * @buf: user input
457 * @off: file offset
458 * @count: number of byte in input
459 *
460 * writing anything except 0 enables it
461 */
462 static ssize_t
463 pci_write_rom(struct kobject *kobj, char *buf, loff_t off, size_t count)
464 {
465 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
467 if ((off == 0) && (*buf == '0') && (count == 2))
468 pdev->rom_attr_enabled = 0;
469 else
470 pdev->rom_attr_enabled = 1;
472 return count;
473 }
475 /**
476 * pci_read_rom - read a PCI ROM
477 * @kobj: kernel object handle
478 * @buf: where to put the data we read from the ROM
479 * @off: file offset
480 * @count: number of bytes to read
481 *
482 * Put @count bytes starting at @off into @buf from the ROM in the PCI
483 * device corresponding to @kobj.
484 */
485 static ssize_t
486 pci_read_rom(struct kobject *kobj, char *buf, loff_t off, size_t count)
487 {
488 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
489 void __iomem *rom;
490 size_t size;
492 if (!pdev->rom_attr_enabled)
493 return -EINVAL;
495 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
496 if (!rom)
497 return 0;
499 if (off >= size)
500 count = 0;
501 else {
502 if (off + count > size)
503 count = size - off;
505 memcpy_fromio(buf, rom + off, count);
506 }
507 pci_unmap_rom(pdev, rom);
509 return count;
510 }
512 static struct bin_attribute pci_config_attr = {
513 .attr = {
514 .name = "config",
515 .mode = S_IRUGO | S_IWUSR,
516 .owner = THIS_MODULE,
517 },
518 .size = 256,
519 .read = pci_read_config,
520 .write = pci_write_config,
521 };
523 static struct bin_attribute pcie_config_attr = {
524 .attr = {
525 .name = "config",
526 .mode = S_IRUGO | S_IWUSR,
527 .owner = THIS_MODULE,
528 },
529 .size = 4096,
530 .read = pci_read_config,
531 .write = pci_write_config,
532 };
534 int pci_create_sysfs_dev_files (struct pci_dev *pdev)
535 {
536 if (!sysfs_initialized)
537 return -EACCES;
539 if (pdev->cfg_size < 4096)
540 sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
541 else
542 sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
544 pci_create_resource_files(pdev);
546 /* If the device has a ROM, try to expose it in sysfs. */
547 if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
548 struct bin_attribute *rom_attr;
550 rom_attr = kzalloc(sizeof(*rom_attr), GFP_ATOMIC);
551 if (rom_attr) {
552 pdev->rom_attr = rom_attr;
553 rom_attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
554 rom_attr->attr.name = "rom";
555 rom_attr->attr.mode = S_IRUSR;
556 rom_attr->attr.owner = THIS_MODULE;
557 rom_attr->read = pci_read_rom;
558 rom_attr->write = pci_write_rom;
559 sysfs_create_bin_file(&pdev->dev.kobj, rom_attr);
560 }
561 }
562 /* add platform-specific attributes */
563 pcibios_add_platform_entries(pdev);
565 return 0;
566 }
568 /**
569 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
570 * @pdev: device whose entries we should free
571 *
572 * Cleanup when @pdev is removed from sysfs.
573 */
574 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
575 {
576 if (!sysfs_initialized)
577 return;
579 if (pdev->cfg_size < 4096)
580 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
581 else
582 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
584 pci_remove_resource_files(pdev);
586 if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
587 if (pdev->rom_attr) {
588 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
589 kfree(pdev->rom_attr);
590 }
591 }
592 }
594 static int __init pci_sysfs_init(void)
595 {
596 struct pci_dev *pdev = NULL;
598 sysfs_initialized = 1;
599 for_each_pci_dev(pdev)
600 pci_create_sysfs_dev_files(pdev);
602 return 0;
603 }
605 __initcall(pci_sysfs_init);