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>
28 static int sysfs_initialized; /* = 0 */
30 /* show configuration fields */
31 #define pci_config_attr(field, format_string) \
33 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
35 struct pci_dev *pdev; \
37 pdev = to_pci_dev (dev); \
38 return sprintf (buf, format_string, pdev->field); \
41 pci_config_attr(vendor, "0x%04x\n");
42 pci_config_attr(device, "0x%04x\n");
43 pci_config_attr(subsystem_vendor, "0x%04x\n");
44 pci_config_attr(subsystem_device, "0x%04x\n");
45 pci_config_attr(class, "0x%06x\n");
46 pci_config_attr(irq, "%u\n");
48 static ssize_t broken_parity_status_show(struct device *dev,
49 struct device_attribute *attr,
52 struct pci_dev *pdev = to_pci_dev(dev);
53 return sprintf (buf, "%u\n", pdev->broken_parity_status);
56 static ssize_t broken_parity_status_store(struct device *dev,
57 struct device_attribute *attr,
58 const char *buf, size_t count)
60 struct pci_dev *pdev = to_pci_dev(dev);
63 if (strict_strtoul(buf, 0, &val) < 0)
66 pdev->broken_parity_status = !!val;
71 static ssize_t local_cpus_show(struct device *dev,
72 struct device_attribute *attr, char *buf)
74 const struct cpumask *mask;
78 mask = cpumask_of_node(dev_to_node(dev));
80 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
82 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
89 static ssize_t local_cpulist_show(struct device *dev,
90 struct device_attribute *attr, char *buf)
92 const struct cpumask *mask;
96 mask = cpumask_of_node(dev_to_node(dev));
98 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
100 len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
108 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
110 struct pci_dev * pci_dev = to_pci_dev(dev);
114 resource_size_t start, end;
116 if (pci_dev->subordinate)
117 max = DEVICE_COUNT_RESOURCE;
119 max = PCI_BRIDGE_RESOURCES;
121 for (i = 0; i < max; i++) {
122 struct resource *res = &pci_dev->resource[i];
123 pci_resource_to_user(pci_dev, i, res, &start, &end);
124 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
125 (unsigned long long)start,
126 (unsigned long long)end,
127 (unsigned long long)res->flags);
132 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
134 struct pci_dev *pci_dev = to_pci_dev(dev);
136 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
137 pci_dev->vendor, pci_dev->device,
138 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
139 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
140 (u8)(pci_dev->class));
143 static ssize_t is_enabled_store(struct device *dev,
144 struct device_attribute *attr, const char *buf,
147 struct pci_dev *pdev = to_pci_dev(dev);
149 ssize_t result = strict_strtoul(buf, 0, &val);
154 /* this can crash the machine when done on the "wrong" device */
155 if (!capable(CAP_SYS_ADMIN))
159 if (pci_is_enabled(pdev))
160 pci_disable_device(pdev);
164 result = pci_enable_device(pdev);
166 return result < 0 ? result : count;
169 static ssize_t is_enabled_show(struct device *dev,
170 struct device_attribute *attr, char *buf)
172 struct pci_dev *pdev;
174 pdev = to_pci_dev (dev);
175 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
180 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
182 return sprintf (buf, "%d\n", dev->numa_node);
187 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
189 struct pci_dev *pdev = to_pci_dev(dev);
191 return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
195 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
198 return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
202 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
204 struct pci_dev *pdev = to_pci_dev(dev);
206 if (!pdev->subordinate)
209 return sprintf (buf, "%u\n",
210 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
214 msi_bus_store(struct device *dev, struct device_attribute *attr,
215 const char *buf, size_t count)
217 struct pci_dev *pdev = to_pci_dev(dev);
220 if (strict_strtoul(buf, 0, &val) < 0)
223 /* bad things may happen if the no_msi flag is changed
224 * while some drivers are loaded */
225 if (!capable(CAP_SYS_ADMIN))
228 /* Maybe pci devices without subordinate busses shouldn't even have this
229 * attribute in the first place? */
230 if (!pdev->subordinate)
233 /* Is the flag going to change, or keep the value it already had? */
234 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
236 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
238 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
239 " bad things could happen\n", val ? "" : " not");
245 #ifdef CONFIG_HOTPLUG
246 static DEFINE_MUTEX(pci_remove_rescan_mutex);
247 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
251 struct pci_bus *b = NULL;
253 if (strict_strtoul(buf, 0, &val) < 0)
257 mutex_lock(&pci_remove_rescan_mutex);
258 while ((b = pci_find_next_bus(b)) != NULL)
260 mutex_unlock(&pci_remove_rescan_mutex);
265 struct bus_attribute pci_bus_attrs[] = {
266 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
271 dev_rescan_store(struct device *dev, struct device_attribute *attr,
272 const char *buf, size_t count)
275 struct pci_dev *pdev = to_pci_dev(dev);
277 if (strict_strtoul(buf, 0, &val) < 0)
281 mutex_lock(&pci_remove_rescan_mutex);
282 pci_rescan_bus(pdev->bus);
283 mutex_unlock(&pci_remove_rescan_mutex);
288 static void remove_callback(struct device *dev)
290 struct pci_dev *pdev = to_pci_dev(dev);
292 mutex_lock(&pci_remove_rescan_mutex);
293 pci_remove_bus_device(pdev);
294 mutex_unlock(&pci_remove_rescan_mutex);
298 remove_store(struct device *dev, struct device_attribute *dummy,
299 const char *buf, size_t count)
304 if (strict_strtoul(buf, 0, &val) < 0)
307 /* An attribute cannot be unregistered by one of its own methods,
308 * so we have to use this roundabout approach.
311 ret = device_schedule_callback(dev, remove_callback);
318 struct device_attribute pci_dev_attrs[] = {
322 __ATTR_RO(subsystem_vendor),
323 __ATTR_RO(subsystem_device),
326 __ATTR_RO(local_cpus),
327 __ATTR_RO(local_cpulist),
330 __ATTR_RO(numa_node),
332 __ATTR_RO(dma_mask_bits),
333 __ATTR_RO(consistent_dma_mask_bits),
334 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
335 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
336 broken_parity_status_show,broken_parity_status_store),
337 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
338 #ifdef CONFIG_HOTPLUG
339 __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
340 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
346 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
348 struct pci_dev *pdev = to_pci_dev(dev);
350 return sprintf(buf, "%u\n",
351 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
352 IORESOURCE_ROM_SHADOW));
354 struct device_attribute vga_attr = __ATTR_RO(boot_vga);
357 pci_read_config(struct kobject *kobj, struct bin_attribute *bin_attr,
358 char *buf, loff_t off, size_t count)
360 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
361 unsigned int size = 64;
362 loff_t init_off = off;
363 u8 *data = (u8*) buf;
365 /* Several chips lock up trying to read undefined config space */
366 if (capable(CAP_SYS_ADMIN)) {
367 size = dev->cfg_size;
368 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
374 if (off + count > size) {
381 if ((off & 1) && size) {
383 pci_user_read_config_byte(dev, off, &val);
384 data[off - init_off] = val;
389 if ((off & 3) && size > 2) {
391 pci_user_read_config_word(dev, off, &val);
392 data[off - init_off] = val & 0xff;
393 data[off - init_off + 1] = (val >> 8) & 0xff;
400 pci_user_read_config_dword(dev, off, &val);
401 data[off - init_off] = val & 0xff;
402 data[off - init_off + 1] = (val >> 8) & 0xff;
403 data[off - init_off + 2] = (val >> 16) & 0xff;
404 data[off - init_off + 3] = (val >> 24) & 0xff;
411 pci_user_read_config_word(dev, off, &val);
412 data[off - init_off] = val & 0xff;
413 data[off - init_off + 1] = (val >> 8) & 0xff;
420 pci_user_read_config_byte(dev, off, &val);
421 data[off - init_off] = val;
430 pci_write_config(struct kobject *kobj, struct bin_attribute *bin_attr,
431 char *buf, loff_t off, size_t count)
433 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
434 unsigned int size = count;
435 loff_t init_off = off;
436 u8 *data = (u8*) buf;
438 if (off > dev->cfg_size)
440 if (off + count > dev->cfg_size) {
441 size = dev->cfg_size - off;
445 if ((off & 1) && size) {
446 pci_user_write_config_byte(dev, off, data[off - init_off]);
451 if ((off & 3) && size > 2) {
452 u16 val = data[off - init_off];
453 val |= (u16) data[off - init_off + 1] << 8;
454 pci_user_write_config_word(dev, off, val);
460 u32 val = data[off - init_off];
461 val |= (u32) data[off - init_off + 1] << 8;
462 val |= (u32) data[off - init_off + 2] << 16;
463 val |= (u32) data[off - init_off + 3] << 24;
464 pci_user_write_config_dword(dev, off, val);
470 u16 val = data[off - init_off];
471 val |= (u16) data[off - init_off + 1] << 8;
472 pci_user_write_config_word(dev, off, val);
478 pci_user_write_config_byte(dev, off, data[off - init_off]);
487 read_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
488 char *buf, loff_t off, size_t count)
490 struct pci_dev *dev =
491 to_pci_dev(container_of(kobj, struct device, kobj));
493 if (off > bin_attr->size)
495 else if (count > bin_attr->size - off)
496 count = bin_attr->size - off;
498 return pci_read_vpd(dev, off, count, buf);
502 write_vpd_attr(struct kobject *kobj, struct bin_attribute *bin_attr,
503 char *buf, loff_t off, size_t count)
505 struct pci_dev *dev =
506 to_pci_dev(container_of(kobj, struct device, kobj));
508 if (off > bin_attr->size)
510 else if (count > bin_attr->size - off)
511 count = bin_attr->size - off;
513 return pci_write_vpd(dev, off, count, buf);
516 #ifdef HAVE_PCI_LEGACY
518 * pci_read_legacy_io - read byte(s) from legacy I/O port space
519 * @kobj: kobject corresponding to file to read from
520 * @bin_attr: struct bin_attribute for this file
521 * @buf: buffer to store results
522 * @off: offset into legacy I/O port space
523 * @count: number of bytes to read
525 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
526 * callback routine (pci_legacy_read).
529 pci_read_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
530 char *buf, loff_t off, size_t count)
532 struct pci_bus *bus = to_pci_bus(container_of(kobj,
536 /* Only support 1, 2 or 4 byte accesses */
537 if (count != 1 && count != 2 && count != 4)
540 return pci_legacy_read(bus, off, (u32 *)buf, count);
544 * pci_write_legacy_io - write byte(s) to legacy I/O port space
545 * @kobj: kobject corresponding to file to read from
546 * @bin_attr: struct bin_attribute for this file
547 * @buf: buffer containing value to be written
548 * @off: offset into legacy I/O port space
549 * @count: number of bytes to write
551 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
552 * callback routine (pci_legacy_write).
555 pci_write_legacy_io(struct kobject *kobj, struct bin_attribute *bin_attr,
556 char *buf, loff_t off, size_t count)
558 struct pci_bus *bus = to_pci_bus(container_of(kobj,
561 /* Only support 1, 2 or 4 byte accesses */
562 if (count != 1 && count != 2 && count != 4)
565 return pci_legacy_write(bus, off, *(u32 *)buf, count);
569 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
570 * @kobj: kobject corresponding to device to be mapped
571 * @attr: struct bin_attribute for this file
572 * @vma: struct vm_area_struct passed to mmap
574 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
575 * legacy memory space (first meg of bus space) into application virtual
579 pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
580 struct vm_area_struct *vma)
582 struct pci_bus *bus = to_pci_bus(container_of(kobj,
586 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
590 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
591 * @kobj: kobject corresponding to device to be mapped
592 * @attr: struct bin_attribute for this file
593 * @vma: struct vm_area_struct passed to mmap
595 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
596 * legacy IO space (first meg of bus space) into application virtual
597 * memory space. Returns -ENOSYS if the operation isn't supported
600 pci_mmap_legacy_io(struct kobject *kobj, struct bin_attribute *attr,
601 struct vm_area_struct *vma)
603 struct pci_bus *bus = to_pci_bus(container_of(kobj,
607 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
611 * pci_adjust_legacy_attr - adjustment of legacy file attributes
612 * @b: bus to create files under
613 * @mmap_type: I/O port or memory
615 * Stub implementation. Can be overridden by arch if necessary.
618 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
624 * pci_create_legacy_files - create legacy I/O port and memory files
625 * @b: bus to create files under
627 * Some platforms allow access to legacy I/O port and ISA memory space on
628 * a per-bus basis. This routine creates the files and ties them into
629 * their associated read, write and mmap files from pci-sysfs.c
631 * On error unwind, but don't propogate the error to the caller
632 * as it is ok to set up the PCI bus without these files.
634 void pci_create_legacy_files(struct pci_bus *b)
638 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
643 b->legacy_io->attr.name = "legacy_io";
644 b->legacy_io->size = 0xffff;
645 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
646 b->legacy_io->read = pci_read_legacy_io;
647 b->legacy_io->write = pci_write_legacy_io;
648 b->legacy_io->mmap = pci_mmap_legacy_io;
649 pci_adjust_legacy_attr(b, pci_mmap_io);
650 error = device_create_bin_file(&b->dev, b->legacy_io);
654 /* Allocated above after the legacy_io struct */
655 b->legacy_mem = b->legacy_io + 1;
656 b->legacy_mem->attr.name = "legacy_mem";
657 b->legacy_mem->size = 1024*1024;
658 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
659 b->legacy_mem->mmap = pci_mmap_legacy_mem;
660 pci_adjust_legacy_attr(b, pci_mmap_mem);
661 error = device_create_bin_file(&b->dev, b->legacy_mem);
668 device_remove_bin_file(&b->dev, b->legacy_io);
673 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
674 "and ISA memory resources to sysfs\n");
678 void pci_remove_legacy_files(struct pci_bus *b)
681 device_remove_bin_file(&b->dev, b->legacy_io);
682 device_remove_bin_file(&b->dev, b->legacy_mem);
683 kfree(b->legacy_io); /* both are allocated here */
686 #endif /* HAVE_PCI_LEGACY */
690 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma)
692 unsigned long nr, start, size;
694 nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
695 start = vma->vm_pgoff;
696 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
697 if (start < size && size - start >= nr)
699 WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n",
700 current->comm, start, start+nr, pci_name(pdev), resno, size);
705 * pci_mmap_resource - map a PCI resource into user memory space
706 * @kobj: kobject for mapping
707 * @attr: struct bin_attribute for the file being mapped
708 * @vma: struct vm_area_struct passed into the mmap
709 * @write_combine: 1 for write_combine mapping
711 * Use the regular PCI mapping routines to map a PCI resource into userspace.
714 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
715 struct vm_area_struct *vma, int write_combine)
717 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
718 struct device, kobj));
719 struct resource *res = (struct resource *)attr->private;
720 enum pci_mmap_state mmap_type;
721 resource_size_t start, end;
724 for (i = 0; i < PCI_ROM_RESOURCE; i++)
725 if (res == &pdev->resource[i])
727 if (i >= PCI_ROM_RESOURCE)
730 if (!pci_mmap_fits(pdev, i, vma))
733 /* pci_mmap_page_range() expects the same kind of entry as coming
734 * from /proc/bus/pci/ which is a "user visible" value. If this is
735 * different from the resource itself, arch will do necessary fixup.
737 pci_resource_to_user(pdev, i, res, &start, &end);
738 vma->vm_pgoff += start >> PAGE_SHIFT;
739 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
741 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
744 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
748 pci_mmap_resource_uc(struct kobject *kobj, struct bin_attribute *attr,
749 struct vm_area_struct *vma)
751 return pci_mmap_resource(kobj, attr, vma, 0);
755 pci_mmap_resource_wc(struct kobject *kobj, struct bin_attribute *attr,
756 struct vm_area_struct *vma)
758 return pci_mmap_resource(kobj, attr, vma, 1);
762 * pci_remove_resource_files - cleanup resource files
763 * @pdev: dev to cleanup
765 * If we created resource files for @pdev, remove them from sysfs and
766 * free their resources.
769 pci_remove_resource_files(struct pci_dev *pdev)
773 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
774 struct bin_attribute *res_attr;
776 res_attr = pdev->res_attr[i];
778 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
782 res_attr = pdev->res_attr_wc[i];
784 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
790 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
792 /* allocate attribute structure, piggyback attribute name */
793 int name_len = write_combine ? 13 : 10;
794 struct bin_attribute *res_attr;
797 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
799 char *res_attr_name = (char *)(res_attr + 1);
802 pdev->res_attr_wc[num] = res_attr;
803 sprintf(res_attr_name, "resource%d_wc", num);
804 res_attr->mmap = pci_mmap_resource_wc;
806 pdev->res_attr[num] = res_attr;
807 sprintf(res_attr_name, "resource%d", num);
808 res_attr->mmap = pci_mmap_resource_uc;
810 res_attr->attr.name = res_attr_name;
811 res_attr->attr.mode = S_IRUSR | S_IWUSR;
812 res_attr->size = pci_resource_len(pdev, num);
813 res_attr->private = &pdev->resource[num];
814 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
822 * pci_create_resource_files - create resource files in sysfs for @dev
823 * @pdev: dev in question
825 * Walk the resources in @pdev creating files for each resource available.
827 static int pci_create_resource_files(struct pci_dev *pdev)
832 /* Expose the PCI resources from this device as files */
833 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
835 /* skip empty resources */
836 if (!pci_resource_len(pdev, i))
839 retval = pci_create_attr(pdev, i, 0);
840 /* for prefetchable resources, create a WC mappable file */
841 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
842 retval = pci_create_attr(pdev, i, 1);
845 pci_remove_resource_files(pdev);
851 #else /* !HAVE_PCI_MMAP */
852 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
853 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
854 #endif /* HAVE_PCI_MMAP */
857 * pci_write_rom - used to enable access to the PCI ROM display
858 * @kobj: kernel object handle
859 * @bin_attr: struct bin_attribute for this file
862 * @count: number of byte in input
864 * writing anything except 0 enables it
867 pci_write_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
868 char *buf, loff_t off, size_t count)
870 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
872 if ((off == 0) && (*buf == '0') && (count == 2))
873 pdev->rom_attr_enabled = 0;
875 pdev->rom_attr_enabled = 1;
881 * pci_read_rom - read a PCI ROM
882 * @kobj: kernel object handle
883 * @bin_attr: struct bin_attribute for this file
884 * @buf: where to put the data we read from the ROM
886 * @count: number of bytes to read
888 * Put @count bytes starting at @off into @buf from the ROM in the PCI
889 * device corresponding to @kobj.
892 pci_read_rom(struct kobject *kobj, struct bin_attribute *bin_attr,
893 char *buf, loff_t off, size_t count)
895 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
899 if (!pdev->rom_attr_enabled)
902 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
909 if (off + count > size)
912 memcpy_fromio(buf, rom + off, count);
914 pci_unmap_rom(pdev, rom);
919 static struct bin_attribute pci_config_attr = {
922 .mode = S_IRUGO | S_IWUSR,
924 .size = PCI_CFG_SPACE_SIZE,
925 .read = pci_read_config,
926 .write = pci_write_config,
929 static struct bin_attribute pcie_config_attr = {
932 .mode = S_IRUGO | S_IWUSR,
934 .size = PCI_CFG_SPACE_EXP_SIZE,
935 .read = pci_read_config,
936 .write = pci_write_config,
939 int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
944 static ssize_t reset_store(struct device *dev,
945 struct device_attribute *attr, const char *buf,
948 struct pci_dev *pdev = to_pci_dev(dev);
950 ssize_t result = strict_strtoul(buf, 0, &val);
957 return pci_reset_function(pdev);
960 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
962 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
965 struct bin_attribute *attr;
967 /* If the device has VPD, try to expose it in sysfs. */
969 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
973 attr->size = dev->vpd->len;
974 attr->attr.name = "vpd";
975 attr->attr.mode = S_IRUSR | S_IWUSR;
976 attr->read = read_vpd_attr;
977 attr->write = write_vpd_attr;
978 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
980 kfree(dev->vpd->attr);
983 dev->vpd->attr = attr;
986 /* Active State Power Management */
987 pcie_aspm_create_sysfs_dev_files(dev);
989 if (!pci_probe_reset_function(dev)) {
990 retval = device_create_file(&dev->dev, &reset_attr);
998 pcie_aspm_remove_sysfs_dev_files(dev);
999 if (dev->vpd && dev->vpd->attr) {
1000 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1001 kfree(dev->vpd->attr);
1007 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1011 struct bin_attribute *attr;
1013 if (!sysfs_initialized)
1016 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1017 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1019 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1023 retval = pci_create_resource_files(pdev);
1025 goto err_config_file;
1027 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1028 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1029 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1032 /* If the device has a ROM, try to expose it in sysfs. */
1034 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1037 goto err_resource_files;
1039 attr->size = rom_size;
1040 attr->attr.name = "rom";
1041 attr->attr.mode = S_IRUSR;
1042 attr->read = pci_read_rom;
1043 attr->write = pci_write_rom;
1044 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1047 goto err_resource_files;
1049 pdev->rom_attr = attr;
1052 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1053 retval = device_create_file(&pdev->dev, &vga_attr);
1058 /* add platform-specific attributes */
1059 retval = pcibios_add_platform_entries(pdev);
1063 /* add sysfs entries for various capabilities */
1064 retval = pci_create_capabilities_sysfs(pdev);
1071 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1072 device_remove_file(&pdev->dev, &vga_attr);
1075 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1076 kfree(pdev->rom_attr);
1077 pdev->rom_attr = NULL;
1080 pci_remove_resource_files(pdev);
1082 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1083 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1085 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1090 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1092 if (dev->vpd && dev->vpd->attr) {
1093 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1094 kfree(dev->vpd->attr);
1097 pcie_aspm_remove_sysfs_dev_files(dev);
1098 if (dev->reset_fn) {
1099 device_remove_file(&dev->dev, &reset_attr);
1105 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1106 * @pdev: device whose entries we should free
1108 * Cleanup when @pdev is removed from sysfs.
1110 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1114 if (!sysfs_initialized)
1117 pci_remove_capabilities_sysfs(pdev);
1119 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1120 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1122 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1124 pci_remove_resource_files(pdev);
1126 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1127 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1128 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1131 if (rom_size && pdev->rom_attr) {
1132 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1133 kfree(pdev->rom_attr);
1137 static int __init pci_sysfs_init(void)
1139 struct pci_dev *pdev = NULL;
1142 sysfs_initialized = 1;
1143 for_each_pci_dev(pdev) {
1144 retval = pci_create_sysfs_dev_files(pdev);
1154 late_initcall(pci_sysfs_init);