2 * drivers/pci/pci-sysfs.c
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>
11 * File attributes for PCI devices
13 * Modeled after usb's driverfs.c
18 #include <linux/kernel.h>
19 #include <linux/pci.h>
20 #include <linux/stat.h>
21 #include <linux/topology.h>
26 static int sysfs_initialized; /* = 0 */
28 /* show configuration fields */
29 #define pci_config_attr(field, format_string) \
31 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
33 struct pci_dev *pdev; \
35 pdev = to_pci_dev (dev); \
36 return sprintf (buf, format_string, pdev->field); \
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,
51 struct pci_dev *pdev = to_pci_dev(dev);
52 return sprintf (buf, "%u\n", pdev->broken_parity_status);
55 static ssize_t broken_parity_status_store(struct device *dev,
56 struct device_attribute *attr,
57 const char *buf, size_t count)
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;
69 static ssize_t local_cpus_show(struct device *dev,
70 struct device_attribute *attr, char *buf)
75 mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
76 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
83 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
85 struct pci_dev * pci_dev = to_pci_dev(dev);
89 resource_size_t start, end;
91 if (pci_dev->subordinate)
92 max = DEVICE_COUNT_RESOURCE;
94 for (i = 0; i < max; i++) {
95 struct resource *res = &pci_dev->resource[i];
96 pci_resource_to_user(pci_dev, i, res, &start, &end);
97 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
98 (unsigned long long)start,
99 (unsigned long long)end,
100 (unsigned long long)res->flags);
105 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
107 struct pci_dev *pci_dev = to_pci_dev(dev);
109 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
110 pci_dev->vendor, pci_dev->device,
111 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
112 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
113 (u8)(pci_dev->class));
116 is_enabled_store(struct device *dev, struct device_attribute *attr,
117 const char *buf, size_t count)
119 struct pci_dev *pdev = to_pci_dev(dev);
122 /* this can crash the machine when done on the "wrong" device */
123 if (!capable(CAP_SYS_ADMIN))
127 pci_disable_device(pdev);
130 retval = pci_enable_device(pdev);
138 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
140 struct pci_dev *pdev = to_pci_dev(dev);
142 if (!pdev->subordinate)
145 return sprintf (buf, "%u\n",
146 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
150 msi_bus_store(struct device *dev, struct device_attribute *attr,
151 const char *buf, size_t count)
153 struct pci_dev *pdev = to_pci_dev(dev);
155 /* bad things may happen if the no_msi flag is changed
156 * while some drivers are loaded */
157 if (!capable(CAP_SYS_ADMIN))
160 if (!pdev->subordinate)
164 pdev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
165 dev_warn(&pdev->dev, "forced subordinate bus to not support MSI,"
166 " bad things could happen.\n");
170 pdev->subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
171 dev_warn(&pdev->dev, "forced subordinate bus to support MSI,"
172 " bad things could happen.\n");
178 struct device_attribute pci_dev_attrs[] = {
182 __ATTR_RO(subsystem_vendor),
183 __ATTR_RO(subsystem_device),
186 __ATTR_RO(local_cpus),
188 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
189 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
190 broken_parity_status_show,broken_parity_status_store),
191 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
196 pci_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
198 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
199 unsigned int size = 64;
200 loff_t init_off = off;
201 u8 *data = (u8*) buf;
203 /* Several chips lock up trying to read undefined config space */
204 if (capable(CAP_SYS_ADMIN)) {
205 size = dev->cfg_size;
206 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
212 if (off + count > size) {
219 if ((off & 1) && size) {
221 pci_user_read_config_byte(dev, off, &val);
222 data[off - init_off] = val;
227 if ((off & 3) && size > 2) {
229 pci_user_read_config_word(dev, off, &val);
230 data[off - init_off] = val & 0xff;
231 data[off - init_off + 1] = (val >> 8) & 0xff;
238 pci_user_read_config_dword(dev, off, &val);
239 data[off - init_off] = val & 0xff;
240 data[off - init_off + 1] = (val >> 8) & 0xff;
241 data[off - init_off + 2] = (val >> 16) & 0xff;
242 data[off - init_off + 3] = (val >> 24) & 0xff;
249 pci_user_read_config_word(dev, off, &val);
250 data[off - init_off] = val & 0xff;
251 data[off - init_off + 1] = (val >> 8) & 0xff;
258 pci_user_read_config_byte(dev, off, &val);
259 data[off - init_off] = val;
268 pci_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
270 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
271 unsigned int size = count;
272 loff_t init_off = off;
273 u8 *data = (u8*) buf;
275 if (off > dev->cfg_size)
277 if (off + count > dev->cfg_size) {
278 size = dev->cfg_size - off;
282 if ((off & 1) && size) {
283 pci_user_write_config_byte(dev, off, data[off - init_off]);
288 if ((off & 3) && size > 2) {
289 u16 val = data[off - init_off];
290 val |= (u16) data[off - init_off + 1] << 8;
291 pci_user_write_config_word(dev, off, val);
297 u32 val = data[off - init_off];
298 val |= (u32) data[off - init_off + 1] << 8;
299 val |= (u32) data[off - init_off + 2] << 16;
300 val |= (u32) data[off - init_off + 3] << 24;
301 pci_user_write_config_dword(dev, off, val);
307 u16 val = data[off - init_off];
308 val |= (u16) data[off - init_off + 1] << 8;
309 pci_user_write_config_word(dev, off, val);
315 pci_user_write_config_byte(dev, off, data[off - init_off]);
323 #ifdef HAVE_PCI_LEGACY
325 * pci_read_legacy_io - read byte(s) from legacy I/O port space
326 * @kobj: kobject corresponding to file to read from
327 * @buf: buffer to store results
328 * @off: offset into legacy I/O port space
329 * @count: number of bytes to read
331 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
332 * callback routine (pci_legacy_read).
335 pci_read_legacy_io(struct kobject *kobj, char *buf, loff_t off, size_t count)
337 struct pci_bus *bus = to_pci_bus(container_of(kobj,
341 /* Only support 1, 2 or 4 byte accesses */
342 if (count != 1 && count != 2 && count != 4)
345 return pci_legacy_read(bus, off, (u32 *)buf, count);
349 * pci_write_legacy_io - write byte(s) to legacy I/O port space
350 * @kobj: kobject corresponding to file to read from
351 * @buf: buffer containing value to be written
352 * @off: offset into legacy I/O port space
353 * @count: number of bytes to write
355 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
356 * callback routine (pci_legacy_write).
359 pci_write_legacy_io(struct kobject *kobj, char *buf, loff_t off, size_t count)
361 struct pci_bus *bus = to_pci_bus(container_of(kobj,
364 /* Only support 1, 2 or 4 byte accesses */
365 if (count != 1 && count != 2 && count != 4)
368 return pci_legacy_write(bus, off, *(u32 *)buf, count);
372 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
373 * @kobj: kobject corresponding to device to be mapped
374 * @attr: struct bin_attribute for this file
375 * @vma: struct vm_area_struct passed to mmap
377 * Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap
378 * legacy memory space (first meg of bus space) into application virtual
382 pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
383 struct vm_area_struct *vma)
385 struct pci_bus *bus = to_pci_bus(container_of(kobj,
389 return pci_mmap_legacy_page_range(bus, vma);
391 #endif /* HAVE_PCI_LEGACY */
395 * pci_mmap_resource - map a PCI resource into user memory space
396 * @kobj: kobject for mapping
397 * @attr: struct bin_attribute for the file being mapped
398 * @vma: struct vm_area_struct passed into the mmap
400 * Use the regular PCI mapping routines to map a PCI resource into userspace.
401 * FIXME: write combining? maybe automatic for prefetchable regions?
404 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
405 struct vm_area_struct *vma)
407 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
408 struct device, kobj));
409 struct resource *res = (struct resource *)attr->private;
410 enum pci_mmap_state mmap_type;
411 resource_size_t start, end;
414 for (i = 0; i < PCI_ROM_RESOURCE; i++)
415 if (res == &pdev->resource[i])
417 if (i >= PCI_ROM_RESOURCE)
420 /* pci_mmap_page_range() expects the same kind of entry as coming
421 * from /proc/bus/pci/ which is a "user visible" value. If this is
422 * different from the resource itself, arch will do necessary fixup.
424 pci_resource_to_user(pdev, i, res, &start, &end);
425 vma->vm_pgoff += start >> PAGE_SHIFT;
426 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
428 return pci_mmap_page_range(pdev, vma, mmap_type, 0);
432 * pci_remove_resource_files - cleanup resource files
433 * @dev: dev to cleanup
435 * If we created resource files for @dev, remove them from sysfs and
436 * free their resources.
439 pci_remove_resource_files(struct pci_dev *pdev)
443 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
444 struct bin_attribute *res_attr;
446 res_attr = pdev->res_attr[i];
448 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
455 * pci_create_resource_files - create resource files in sysfs for @dev
456 * @dev: dev in question
458 * Walk the resources in @dev creating files for each resource available.
460 static int pci_create_resource_files(struct pci_dev *pdev)
465 /* Expose the PCI resources from this device as files */
466 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
467 struct bin_attribute *res_attr;
469 /* skip empty resources */
470 if (!pci_resource_len(pdev, i))
473 /* allocate attribute structure, piggyback attribute name */
474 res_attr = kzalloc(sizeof(*res_attr) + 10, GFP_ATOMIC);
476 char *res_attr_name = (char *)(res_attr + 1);
478 pdev->res_attr[i] = res_attr;
479 sprintf(res_attr_name, "resource%d", i);
480 res_attr->attr.name = res_attr_name;
481 res_attr->attr.mode = S_IRUSR | S_IWUSR;
482 res_attr->attr.owner = THIS_MODULE;
483 res_attr->size = pci_resource_len(pdev, i);
484 res_attr->mmap = pci_mmap_resource;
485 res_attr->private = &pdev->resource[i];
486 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
488 pci_remove_resource_files(pdev);
497 #else /* !HAVE_PCI_MMAP */
498 static inline int pci_create_resource_files(struct pci_dev *dev) { return 0; }
499 static inline void pci_remove_resource_files(struct pci_dev *dev) { return; }
500 #endif /* HAVE_PCI_MMAP */
503 * pci_write_rom - used to enable access to the PCI ROM display
504 * @kobj: kernel object handle
507 * @count: number of byte in input
509 * writing anything except 0 enables it
512 pci_write_rom(struct kobject *kobj, char *buf, loff_t off, size_t count)
514 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
516 if ((off == 0) && (*buf == '0') && (count == 2))
517 pdev->rom_attr_enabled = 0;
519 pdev->rom_attr_enabled = 1;
525 * pci_read_rom - read a PCI ROM
526 * @kobj: kernel object handle
527 * @buf: where to put the data we read from the ROM
529 * @count: number of bytes to read
531 * Put @count bytes starting at @off into @buf from the ROM in the PCI
532 * device corresponding to @kobj.
535 pci_read_rom(struct kobject *kobj, char *buf, loff_t off, size_t count)
537 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
541 if (!pdev->rom_attr_enabled)
544 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
551 if (off + count > size)
554 memcpy_fromio(buf, rom + off, count);
556 pci_unmap_rom(pdev, rom);
561 static struct bin_attribute pci_config_attr = {
564 .mode = S_IRUGO | S_IWUSR,
565 .owner = THIS_MODULE,
568 .read = pci_read_config,
569 .write = pci_write_config,
572 static struct bin_attribute pcie_config_attr = {
575 .mode = S_IRUGO | S_IWUSR,
576 .owner = THIS_MODULE,
579 .read = pci_read_config,
580 .write = pci_write_config,
583 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
585 struct bin_attribute *rom_attr = NULL;
588 if (!sysfs_initialized)
591 if (pdev->cfg_size < 4096)
592 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
594 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
598 retval = pci_create_resource_files(pdev);
602 /* If the device has a ROM, try to expose it in sysfs. */
603 if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
604 rom_attr = kzalloc(sizeof(*rom_attr), GFP_ATOMIC);
606 pdev->rom_attr = rom_attr;
607 rom_attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
608 rom_attr->attr.name = "rom";
609 rom_attr->attr.mode = S_IRUSR;
610 rom_attr->attr.owner = THIS_MODULE;
611 rom_attr->read = pci_read_rom;
612 rom_attr->write = pci_write_rom;
613 retval = sysfs_create_bin_file(&pdev->dev.kobj, rom_attr);
621 /* add platform-specific attributes */
622 pcibios_add_platform_entries(pdev);
629 if (pdev->cfg_size < 4096)
630 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
632 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
638 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
639 * @pdev: device whose entries we should free
641 * Cleanup when @pdev is removed from sysfs.
643 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
645 if (!sysfs_initialized)
648 if (pdev->cfg_size < 4096)
649 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
651 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
653 pci_remove_resource_files(pdev);
655 if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
656 if (pdev->rom_attr) {
657 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
658 kfree(pdev->rom_attr);
663 static int __init pci_sysfs_init(void)
665 struct pci_dev *pdev = NULL;
668 sysfs_initialized = 1;
669 for_each_pci_dev(pdev) {
670 retval = pci_create_sysfs_dev_files(pdev);
678 __initcall(pci_sysfs_init);