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/sched.h>
20 #include <linux/pci.h>
21 #include <linux/stat.h>
22 #include <linux/topology.h>
24 #include <linux/capability.h>
25 #include <linux/pci-aspm.h>
26 #include <linux/slab.h>
29 static int sysfs_initialized; /* = 0 */
31 /* show configuration fields */
32 #define pci_config_attr(field, format_string) \
34 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
36 struct pci_dev *pdev; \
38 pdev = to_pci_dev (dev); \
39 return sprintf (buf, format_string, pdev->field); \
42 pci_config_attr(vendor, "0x%04x\n");
43 pci_config_attr(device, "0x%04x\n");
44 pci_config_attr(subsystem_vendor, "0x%04x\n");
45 pci_config_attr(subsystem_device, "0x%04x\n");
46 pci_config_attr(class, "0x%06x\n");
47 pci_config_attr(irq, "%u\n");
49 static ssize_t broken_parity_status_show(struct device *dev,
50 struct device_attribute *attr,
53 struct pci_dev *pdev = to_pci_dev(dev);
54 return sprintf (buf, "%u\n", pdev->broken_parity_status);
57 static ssize_t broken_parity_status_store(struct device *dev,
58 struct device_attribute *attr,
59 const char *buf, size_t count)
61 struct pci_dev *pdev = to_pci_dev(dev);
64 if (strict_strtoul(buf, 0, &val) < 0)
67 pdev->broken_parity_status = !!val;
72 static ssize_t local_cpus_show(struct device *dev,
73 struct device_attribute *attr, char *buf)
75 const struct cpumask *mask;
79 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
80 cpumask_of_node(dev_to_node(dev));
82 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
84 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
91 static ssize_t local_cpulist_show(struct device *dev,
92 struct device_attribute *attr, char *buf)
94 const struct cpumask *mask;
98 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
99 cpumask_of_node(dev_to_node(dev));
101 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
103 len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
111 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
113 struct pci_dev * pci_dev = to_pci_dev(dev);
117 resource_size_t start, end;
119 if (pci_dev->subordinate)
120 max = DEVICE_COUNT_RESOURCE;
122 max = PCI_BRIDGE_RESOURCES;
124 for (i = 0; i < max; i++) {
125 struct resource *res = &pci_dev->resource[i];
126 pci_resource_to_user(pci_dev, i, res, &start, &end);
127 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
128 (unsigned long long)start,
129 (unsigned long long)end,
130 (unsigned long long)res->flags);
135 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
137 struct pci_dev *pci_dev = to_pci_dev(dev);
139 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
140 pci_dev->vendor, pci_dev->device,
141 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
142 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
143 (u8)(pci_dev->class));
146 static ssize_t is_enabled_store(struct device *dev,
147 struct device_attribute *attr, const char *buf,
150 struct pci_dev *pdev = to_pci_dev(dev);
152 ssize_t result = strict_strtoul(buf, 0, &val);
157 /* this can crash the machine when done on the "wrong" device */
158 if (!capable(CAP_SYS_ADMIN))
162 if (pci_is_enabled(pdev))
163 pci_disable_device(pdev);
167 result = pci_enable_device(pdev);
169 return result < 0 ? result : count;
172 static ssize_t is_enabled_show(struct device *dev,
173 struct device_attribute *attr, char *buf)
175 struct pci_dev *pdev;
177 pdev = to_pci_dev (dev);
178 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
183 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
185 return sprintf (buf, "%d\n", dev->numa_node);
190 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
192 struct pci_dev *pdev = to_pci_dev(dev);
194 return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
198 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
201 return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
205 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
207 struct pci_dev *pdev = to_pci_dev(dev);
209 if (!pdev->subordinate)
212 return sprintf (buf, "%u\n",
213 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
217 msi_bus_store(struct device *dev, struct device_attribute *attr,
218 const char *buf, size_t count)
220 struct pci_dev *pdev = to_pci_dev(dev);
223 if (strict_strtoul(buf, 0, &val) < 0)
226 /* bad things may happen if the no_msi flag is changed
227 * while some drivers are loaded */
228 if (!capable(CAP_SYS_ADMIN))
231 /* Maybe pci devices without subordinate busses shouldn't even have this
232 * attribute in the first place? */
233 if (!pdev->subordinate)
236 /* Is the flag going to change, or keep the value it already had? */
237 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
239 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
241 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
242 " bad things could happen\n", val ? "" : " not");
248 #ifdef CONFIG_HOTPLUG
249 static DEFINE_MUTEX(pci_remove_rescan_mutex);
250 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
254 struct pci_bus *b = NULL;
256 if (strict_strtoul(buf, 0, &val) < 0)
260 mutex_lock(&pci_remove_rescan_mutex);
261 while ((b = pci_find_next_bus(b)) != NULL)
263 mutex_unlock(&pci_remove_rescan_mutex);
268 struct bus_attribute pci_bus_attrs[] = {
269 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
274 dev_rescan_store(struct device *dev, struct device_attribute *attr,
275 const char *buf, size_t count)
278 struct pci_dev *pdev = to_pci_dev(dev);
280 if (strict_strtoul(buf, 0, &val) < 0)
284 mutex_lock(&pci_remove_rescan_mutex);
285 pci_rescan_bus(pdev->bus);
286 mutex_unlock(&pci_remove_rescan_mutex);
291 static void remove_callback(struct device *dev)
293 struct pci_dev *pdev = to_pci_dev(dev);
295 mutex_lock(&pci_remove_rescan_mutex);
296 pci_remove_bus_device(pdev);
297 mutex_unlock(&pci_remove_rescan_mutex);
301 remove_store(struct device *dev, struct device_attribute *dummy,
302 const char *buf, size_t count)
307 if (strict_strtoul(buf, 0, &val) < 0)
310 /* An attribute cannot be unregistered by one of its own methods,
311 * so we have to use this roundabout approach.
314 ret = device_schedule_callback(dev, remove_callback);
321 struct device_attribute pci_dev_attrs[] = {
325 __ATTR_RO(subsystem_vendor),
326 __ATTR_RO(subsystem_device),
329 __ATTR_RO(local_cpus),
330 __ATTR_RO(local_cpulist),
333 __ATTR_RO(numa_node),
335 __ATTR_RO(dma_mask_bits),
336 __ATTR_RO(consistent_dma_mask_bits),
337 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
338 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
339 broken_parity_status_show,broken_parity_status_store),
340 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
341 #ifdef CONFIG_HOTPLUG
342 __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
343 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
349 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
351 struct pci_dev *pdev = to_pci_dev(dev);
353 return sprintf(buf, "%u\n",
354 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
355 IORESOURCE_ROM_SHADOW));
357 struct device_attribute vga_attr = __ATTR_RO(boot_vga);
360 pci_read_config(struct kobject *kobj, struct bin_attribute *bin_attr,
361 char *buf, loff_t off, size_t count)
363 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
364 unsigned int size = 64;
365 loff_t init_off = off;
366 u8 *data = (u8*) buf;
368 /* Several chips lock up trying to read undefined config space */
369 if (capable(CAP_SYS_ADMIN)) {
370 size = dev->cfg_size;
371 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
377 if (off + count > size) {
384 if ((off & 1) && size) {
386 pci_user_read_config_byte(dev, off, &val);
387 data[off - init_off] = val;
392 if ((off & 3) && size > 2) {
394 pci_user_read_config_word(dev, off, &val);
395 data[off - init_off] = val & 0xff;
396 data[off - init_off + 1] = (val >> 8) & 0xff;
403 pci_user_read_config_dword(dev, off, &val);
404 data[off - init_off] = val & 0xff;
405 data[off - init_off + 1] = (val >> 8) & 0xff;
406 data[off - init_off + 2] = (val >> 16) & 0xff;
407 data[off - init_off + 3] = (val >> 24) & 0xff;
414 pci_user_read_config_word(dev, off, &val);
415 data[off - init_off] = val & 0xff;
416 data[off - init_off + 1] = (val >> 8) & 0xff;
423 pci_user_read_config_byte(dev, off, &val);
424 data[off - init_off] = val;
433 pci_write_config(struct kobject *kobj, struct bin_attribute *bin_attr,
434 char *buf, loff_t off, size_t count)
436 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
437 unsigned int size = count;
438 loff_t init_off = off;
439 u8 *data = (u8*) buf;
441 if (off > dev->cfg_size)
443 if (off + count > dev->cfg_size) {
444 size = dev->cfg_size - off;
448 if ((off & 1) && size) {
449 pci_user_write_config_byte(dev, off, data[off - init_off]);
454 if ((off & 3) && size > 2) {
455 u16 val = data[off - init_off];
456 val |= (u16) data[off - init_off + 1] << 8;
457 pci_user_write_config_word(dev, off, val);
463 u32 val = data[off - init_off];
464 val |= (u32) data[off - init_off + 1] << 8;
465 val |= (u32) data[off - init_off + 2] << 16;
466 val |= (u32) data[off - init_off + 3] << 24;
467 pci_user_write_config_dword(dev, off, val);
473 u16 val = data[off - init_off];
474 val |= (u16) data[off - init_off + 1] << 8;
475 pci_user_write_config_word(dev, off, val);
481 pci_user_write_config_byte(dev, off, data[off - init_off]);
490 read_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
491 char *buf, loff_t off, size_t count)
493 struct pci_dev *dev =
494 to_pci_dev(container_of(kobj, struct device, kobj));
496 if (off > bin_attr->size)
498 else if (count > bin_attr->size - off)
499 count = bin_attr->size - off;
501 return pci_read_vpd(dev, off, count, buf);
505 write_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
506 char *buf, loff_t off, size_t count)
508 struct pci_dev *dev =
509 to_pci_dev(container_of(kobj, struct device, kobj));
511 if (off > bin_attr->size)
513 else if (count > bin_attr->size - off)
514 count = bin_attr->size - off;
516 return pci_write_vpd(dev, off, count, buf);
519 #ifdef HAVE_PCI_LEGACY
521 * pci_read_legacy_io - read byte(s) from legacy I/O port space
522 * @kobj: kobject corresponding to file to read from
523 * @bin_attr: struct bin_attribute for this file
524 * @buf: buffer to store results
525 * @off: offset into legacy I/O port space
526 * @count: number of bytes to read
528 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
529 * callback routine (pci_legacy_read).
532 pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
533 char *buf, loff_t off, size_t count)
535 struct pci_bus *bus = to_pci_bus(container_of(kobj,
539 /* Only support 1, 2 or 4 byte accesses */
540 if (count != 1 && count != 2 && count != 4)
543 return pci_legacy_read(bus, off, (u32 *)buf, count);
547 * pci_write_legacy_io - write byte(s) to legacy I/O port space
548 * @kobj: kobject corresponding to file to read from
549 * @bin_attr: struct bin_attribute for this file
550 * @buf: buffer containing value to be written
551 * @off: offset into legacy I/O port space
552 * @count: number of bytes to write
554 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
555 * callback routine (pci_legacy_write).
558 pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
559 char *buf, loff_t off, size_t count)
561 struct pci_bus *bus = to_pci_bus(container_of(kobj,
564 /* Only support 1, 2 or 4 byte accesses */
565 if (count != 1 && count != 2 && count != 4)
568 return pci_legacy_write(bus, off, *(u32 *)buf, count);
572 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
573 * @kobj: kobject corresponding to device to be mapped
574 * @attr: struct bin_attribute for this file
575 * @vma: struct vm_area_struct passed to mmap
577 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
578 * legacy memory space (first meg of bus space) into application virtual
582 pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
583 struct vm_area_struct *vma)
585 struct pci_bus *bus = to_pci_bus(container_of(kobj,
589 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
593 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
594 * @kobj: kobject corresponding to device to be mapped
595 * @attr: struct bin_attribute for this file
596 * @vma: struct vm_area_struct passed to mmap
598 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
599 * legacy IO space (first meg of bus space) into application virtual
600 * memory space. Returns -ENOSYS if the operation isn't supported
603 pci_mmap_legacy_io(struct kobject *kobj, struct bin_attribute *attr,
604 struct vm_area_struct *vma)
606 struct pci_bus *bus = to_pci_bus(container_of(kobj,
610 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
614 * pci_adjust_legacy_attr - adjustment of legacy file attributes
615 * @b: bus to create files under
616 * @mmap_type: I/O port or memory
618 * Stub implementation. Can be overridden by arch if necessary.
621 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
627 * pci_create_legacy_files - create legacy I/O port and memory files
628 * @b: bus to create files under
630 * Some platforms allow access to legacy I/O port and ISA memory space on
631 * a per-bus basis. This routine creates the files and ties them into
632 * their associated read, write and mmap files from pci-sysfs.c
634 * On error unwind, but don't propogate the error to the caller
635 * as it is ok to set up the PCI bus without these files.
637 void pci_create_legacy_files(struct pci_bus *b)
641 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
646 sysfs_bin_attr_init(b->legacy_io);
647 b->legacy_io->attr.name = "legacy_io";
648 b->legacy_io->size = 0xffff;
649 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
650 b->legacy_io->read = pci_read_legacy_io;
651 b->legacy_io->write = pci_write_legacy_io;
652 b->legacy_io->mmap = pci_mmap_legacy_io;
653 pci_adjust_legacy_attr(b, pci_mmap_io);
654 error = device_create_bin_file(&b->dev, b->legacy_io);
658 /* Allocated above after the legacy_io struct */
659 b->legacy_mem = b->legacy_io + 1;
660 sysfs_bin_attr_init(b->legacy_mem);
661 b->legacy_mem->attr.name = "legacy_mem";
662 b->legacy_mem->size = 1024*1024;
663 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
664 b->legacy_mem->mmap = pci_mmap_legacy_mem;
665 pci_adjust_legacy_attr(b, pci_mmap_mem);
666 error = device_create_bin_file(&b->dev, b->legacy_mem);
673 device_remove_bin_file(&b->dev, b->legacy_io);
678 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
679 "and ISA memory resources to sysfs\n");
683 void pci_remove_legacy_files(struct pci_bus *b)
686 device_remove_bin_file(&b->dev, b->legacy_io);
687 device_remove_bin_file(&b->dev, b->legacy_mem);
688 kfree(b->legacy_io); /* both are allocated here */
691 #endif /* HAVE_PCI_LEGACY */
695 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma)
697 unsigned long nr, start, size;
699 nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
700 start = vma->vm_pgoff;
701 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
702 if (start < size && size - start >= nr)
704 WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n",
705 current->comm, start, start+nr, pci_name(pdev), resno, size);
710 * pci_mmap_resource - map a PCI resource into user memory space
711 * @kobj: kobject for mapping
712 * @attr: struct bin_attribute for the file being mapped
713 * @vma: struct vm_area_struct passed into the mmap
714 * @write_combine: 1 for write_combine mapping
716 * Use the regular PCI mapping routines to map a PCI resource into userspace.
719 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
720 struct vm_area_struct *vma, int write_combine)
722 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
723 struct device, kobj));
724 struct resource *res = (struct resource *)attr->private;
725 enum pci_mmap_state mmap_type;
726 resource_size_t start, end;
729 for (i = 0; i < PCI_ROM_RESOURCE; i++)
730 if (res == &pdev->resource[i])
732 if (i >= PCI_ROM_RESOURCE)
735 if (!pci_mmap_fits(pdev, i, vma))
738 /* pci_mmap_page_range() expects the same kind of entry as coming
739 * from /proc/bus/pci/ which is a "user visible" value. If this is
740 * different from the resource itself, arch will do necessary fixup.
742 pci_resource_to_user(pdev, i, res, &start, &end);
743 vma->vm_pgoff += start >> PAGE_SHIFT;
744 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
746 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
749 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
753 pci_mmap_resource_uc(struct kobject *kobj, struct bin_attribute *attr,
754 struct vm_area_struct *vma)
756 return pci_mmap_resource(kobj, attr, vma, 0);
760 pci_mmap_resource_wc(struct kobject *kobj, struct bin_attribute *attr,
761 struct vm_area_struct *vma)
763 return pci_mmap_resource(kobj, attr, vma, 1);
767 * pci_remove_resource_files - cleanup resource files
768 * @pdev: dev to cleanup
770 * If we created resource files for @pdev, remove them from sysfs and
771 * free their resources.
774 pci_remove_resource_files(struct pci_dev *pdev)
778 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
779 struct bin_attribute *res_attr;
781 res_attr = pdev->res_attr[i];
783 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
787 res_attr = pdev->res_attr_wc[i];
789 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
795 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
797 /* allocate attribute structure, piggyback attribute name */
798 int name_len = write_combine ? 13 : 10;
799 struct bin_attribute *res_attr;
802 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
804 char *res_attr_name = (char *)(res_attr + 1);
806 sysfs_bin_attr_init(res_attr);
808 pdev->res_attr_wc[num] = res_attr;
809 sprintf(res_attr_name, "resource%d_wc", num);
810 res_attr->mmap = pci_mmap_resource_wc;
812 pdev->res_attr[num] = res_attr;
813 sprintf(res_attr_name, "resource%d", num);
814 res_attr->mmap = pci_mmap_resource_uc;
816 res_attr->attr.name = res_attr_name;
817 res_attr->attr.mode = S_IRUSR | S_IWUSR;
818 res_attr->size = pci_resource_len(pdev, num);
819 res_attr->private = &pdev->resource[num];
820 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
828 * pci_create_resource_files - create resource files in sysfs for @dev
829 * @pdev: dev in question
831 * Walk the resources in @pdev creating files for each resource available.
833 static int pci_create_resource_files(struct pci_dev *pdev)
838 /* Expose the PCI resources from this device as files */
839 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
841 /* skip empty resources */
842 if (!pci_resource_len(pdev, i))
845 retval = pci_create_attr(pdev, i, 0);
846 /* for prefetchable resources, create a WC mappable file */
847 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
848 retval = pci_create_attr(pdev, i, 1);
851 pci_remove_resource_files(pdev);
857 #else /* !HAVE_PCI_MMAP */
858 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
859 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
860 #endif /* HAVE_PCI_MMAP */
863 * pci_write_rom - used to enable access to the PCI ROM display
864 * @kobj: kernel object handle
865 * @bin_attr: struct bin_attribute for this file
868 * @count: number of byte in input
870 * writing anything except 0 enables it
873 pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
874 char *buf, loff_t off, size_t count)
876 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
878 if ((off == 0) && (*buf == '0') && (count == 2))
879 pdev->rom_attr_enabled = 0;
881 pdev->rom_attr_enabled = 1;
887 * pci_read_rom - read a PCI ROM
888 * @kobj: kernel object handle
889 * @bin_attr: struct bin_attribute for this file
890 * @buf: where to put the data we read from the ROM
892 * @count: number of bytes to read
894 * Put @count bytes starting at @off into @buf from the ROM in the PCI
895 * device corresponding to @kobj.
898 pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
899 char *buf, loff_t off, size_t count)
901 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
905 if (!pdev->rom_attr_enabled)
908 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
915 if (off + count > size)
918 memcpy_fromio(buf, rom + off, count);
920 pci_unmap_rom(pdev, rom);
925 static struct bin_attribute pci_config_attr = {
928 .mode = S_IRUGO | S_IWUSR,
930 .size = PCI_CFG_SPACE_SIZE,
931 .read = pci_read_config,
932 .write = pci_write_config,
935 static struct bin_attribute pcie_config_attr = {
938 .mode = S_IRUGO | S_IWUSR,
940 .size = PCI_CFG_SPACE_EXP_SIZE,
941 .read = pci_read_config,
942 .write = pci_write_config,
945 int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
950 static ssize_t reset_store(struct device *dev,
951 struct device_attribute *attr, const char *buf,
954 struct pci_dev *pdev = to_pci_dev(dev);
956 ssize_t result = strict_strtoul(buf, 0, &val);
964 result = pci_reset_function(pdev);
971 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
973 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
976 struct bin_attribute *attr;
978 /* If the device has VPD, try to expose it in sysfs. */
980 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
984 sysfs_bin_attr_init(attr);
985 attr->size = dev->vpd->len;
986 attr->attr.name = "vpd";
987 attr->attr.mode = S_IRUSR | S_IWUSR;
988 attr->read = read_vpd_attr;
989 attr->write = write_vpd_attr;
990 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
992 kfree(dev->vpd->attr);
995 dev->vpd->attr = attr;
998 /* Active State Power Management */
999 pcie_aspm_create_sysfs_dev_files(dev);
1001 if (!pci_probe_reset_function(dev)) {
1002 retval = device_create_file(&dev->dev, &reset_attr);
1010 pcie_aspm_remove_sysfs_dev_files(dev);
1011 if (dev->vpd && dev->vpd->attr) {
1012 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1013 kfree(dev->vpd->attr);
1019 static void pci_remove_slot_links(struct pci_dev *dev)
1022 struct pci_slot *slot;
1024 sysfs_remove_link(&dev->dev.kobj, "slot");
1025 list_for_each_entry(slot, &dev->bus->slots, list) {
1026 if (slot->number != PCI_SLOT(dev->devfn))
1028 snprintf(func, 10, "function%d", PCI_FUNC(dev->devfn));
1029 sysfs_remove_link(&slot->kobj, func);
1033 static int pci_create_slot_links(struct pci_dev *dev)
1037 struct pci_slot *slot;
1039 list_for_each_entry(slot, &dev->bus->slots, list) {
1040 if (slot->number != PCI_SLOT(dev->devfn))
1042 result = sysfs_create_link(&dev->dev.kobj, &slot->kobj, "slot");
1045 snprintf(func, 10, "function%d", PCI_FUNC(dev->devfn));
1046 result = sysfs_create_link(&slot->kobj, &dev->dev.kobj, func);
1052 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1056 struct bin_attribute *attr;
1058 if (!sysfs_initialized)
1061 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1062 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1064 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1068 retval = pci_create_resource_files(pdev);
1070 goto err_config_file;
1072 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1073 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1074 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1077 /* If the device has a ROM, try to expose it in sysfs. */
1079 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1082 goto err_resource_files;
1084 sysfs_bin_attr_init(attr);
1085 attr->size = rom_size;
1086 attr->attr.name = "rom";
1087 attr->attr.mode = S_IRUSR;
1088 attr->read = pci_read_rom;
1089 attr->write = pci_write_rom;
1090 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1093 goto err_resource_files;
1095 pdev->rom_attr = attr;
1098 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1099 retval = device_create_file(&pdev->dev, &vga_attr);
1104 /* add platform-specific attributes */
1105 retval = pcibios_add_platform_entries(pdev);
1109 /* add sysfs entries for various capabilities */
1110 retval = pci_create_capabilities_sysfs(pdev);
1114 pci_create_slot_links(pdev);
1119 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1120 device_remove_file(&pdev->dev, &vga_attr);
1123 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1124 kfree(pdev->rom_attr);
1125 pdev->rom_attr = NULL;
1128 pci_remove_resource_files(pdev);
1130 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1131 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1133 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1138 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1140 if (dev->vpd && dev->vpd->attr) {
1141 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1142 kfree(dev->vpd->attr);
1145 pcie_aspm_remove_sysfs_dev_files(dev);
1146 if (dev->reset_fn) {
1147 device_remove_file(&dev->dev, &reset_attr);
1153 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1154 * @pdev: device whose entries we should free
1156 * Cleanup when @pdev is removed from sysfs.
1158 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1162 if (!sysfs_initialized)
1165 pci_remove_slot_links(pdev);
1167 pci_remove_capabilities_sysfs(pdev);
1169 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1170 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1172 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1174 pci_remove_resource_files(pdev);
1176 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1177 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1178 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1181 if (rom_size && pdev->rom_attr) {
1182 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1183 kfree(pdev->rom_attr);
1187 static int __init pci_sysfs_init(void)
1189 struct pci_dev *pdev = NULL;
1192 sysfs_initialized = 1;
1193 for_each_pci_dev(pdev) {
1194 retval = pci_create_sysfs_dev_files(pdev);
1204 late_initcall(pci_sysfs_init);