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>
25 #include <linux/capability.h>
26 #include <linux/pci-aspm.h>
27 #include <linux/slab.h>
30 static int sysfs_initialized; /* = 0 */
32 /* show configuration fields */
33 #define pci_config_attr(field, format_string) \
35 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
37 struct pci_dev *pdev; \
39 pdev = to_pci_dev (dev); \
40 return sprintf (buf, format_string, pdev->field); \
43 pci_config_attr(vendor, "0x%04x\n");
44 pci_config_attr(device, "0x%04x\n");
45 pci_config_attr(subsystem_vendor, "0x%04x\n");
46 pci_config_attr(subsystem_device, "0x%04x\n");
47 pci_config_attr(class, "0x%06x\n");
48 pci_config_attr(irq, "%u\n");
50 static ssize_t broken_parity_status_show(struct device *dev,
51 struct device_attribute *attr,
54 struct pci_dev *pdev = to_pci_dev(dev);
55 return sprintf (buf, "%u\n", pdev->broken_parity_status);
58 static ssize_t broken_parity_status_store(struct device *dev,
59 struct device_attribute *attr,
60 const char *buf, size_t count)
62 struct pci_dev *pdev = to_pci_dev(dev);
65 if (strict_strtoul(buf, 0, &val) < 0)
68 pdev->broken_parity_status = !!val;
73 static ssize_t local_cpus_show(struct device *dev,
74 struct device_attribute *attr, char *buf)
76 const struct cpumask *mask;
80 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
81 cpumask_of_node(dev_to_node(dev));
83 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
85 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
92 static ssize_t local_cpulist_show(struct device *dev,
93 struct device_attribute *attr, char *buf)
95 const struct cpumask *mask;
99 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
100 cpumask_of_node(dev_to_node(dev));
102 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
104 len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
112 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
114 struct pci_dev * pci_dev = to_pci_dev(dev);
118 resource_size_t start, end;
120 if (pci_dev->subordinate)
121 max = DEVICE_COUNT_RESOURCE;
123 max = PCI_BRIDGE_RESOURCES;
125 for (i = 0; i < max; i++) {
126 struct resource *res = &pci_dev->resource[i];
127 pci_resource_to_user(pci_dev, i, res, &start, &end);
128 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
129 (unsigned long long)start,
130 (unsigned long long)end,
131 (unsigned long long)res->flags);
136 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
138 struct pci_dev *pci_dev = to_pci_dev(dev);
140 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
141 pci_dev->vendor, pci_dev->device,
142 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
143 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
144 (u8)(pci_dev->class));
147 static ssize_t is_enabled_store(struct device *dev,
148 struct device_attribute *attr, const char *buf,
151 struct pci_dev *pdev = to_pci_dev(dev);
153 ssize_t result = strict_strtoul(buf, 0, &val);
158 /* this can crash the machine when done on the "wrong" device */
159 if (!capable(CAP_SYS_ADMIN))
163 if (pci_is_enabled(pdev))
164 pci_disable_device(pdev);
168 result = pci_enable_device(pdev);
170 return result < 0 ? result : count;
173 static ssize_t is_enabled_show(struct device *dev,
174 struct device_attribute *attr, char *buf)
176 struct pci_dev *pdev;
178 pdev = to_pci_dev (dev);
179 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
184 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
186 return sprintf (buf, "%d\n", dev->numa_node);
191 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
193 struct pci_dev *pdev = to_pci_dev(dev);
195 return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
199 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
202 return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
206 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
208 struct pci_dev *pdev = to_pci_dev(dev);
210 if (!pdev->subordinate)
213 return sprintf (buf, "%u\n",
214 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
218 msi_bus_store(struct device *dev, struct device_attribute *attr,
219 const char *buf, size_t count)
221 struct pci_dev *pdev = to_pci_dev(dev);
224 if (strict_strtoul(buf, 0, &val) < 0)
227 /* bad things may happen if the no_msi flag is changed
228 * while some drivers are loaded */
229 if (!capable(CAP_SYS_ADMIN))
232 /* Maybe pci devices without subordinate busses shouldn't even have this
233 * attribute in the first place? */
234 if (!pdev->subordinate)
237 /* Is the flag going to change, or keep the value it already had? */
238 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
240 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
242 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
243 " bad things could happen\n", val ? "" : " not");
249 #ifdef CONFIG_HOTPLUG
250 static DEFINE_MUTEX(pci_remove_rescan_mutex);
251 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
255 struct pci_bus *b = NULL;
257 if (strict_strtoul(buf, 0, &val) < 0)
261 mutex_lock(&pci_remove_rescan_mutex);
262 while ((b = pci_find_next_bus(b)) != NULL)
264 mutex_unlock(&pci_remove_rescan_mutex);
269 struct bus_attribute pci_bus_attrs[] = {
270 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
275 dev_rescan_store(struct device *dev, struct device_attribute *attr,
276 const char *buf, size_t count)
279 struct pci_dev *pdev = to_pci_dev(dev);
281 if (strict_strtoul(buf, 0, &val) < 0)
285 mutex_lock(&pci_remove_rescan_mutex);
286 pci_rescan_bus(pdev->bus);
287 mutex_unlock(&pci_remove_rescan_mutex);
292 static void remove_callback(struct device *dev)
294 struct pci_dev *pdev = to_pci_dev(dev);
296 mutex_lock(&pci_remove_rescan_mutex);
297 pci_remove_bus_device(pdev);
298 mutex_unlock(&pci_remove_rescan_mutex);
302 remove_store(struct device *dev, struct device_attribute *dummy,
303 const char *buf, size_t count)
308 if (strict_strtoul(buf, 0, &val) < 0)
311 /* An attribute cannot be unregistered by one of its own methods,
312 * so we have to use this roundabout approach.
315 ret = device_schedule_callback(dev, remove_callback);
322 struct device_attribute pci_dev_attrs[] = {
326 __ATTR_RO(subsystem_vendor),
327 __ATTR_RO(subsystem_device),
330 __ATTR_RO(local_cpus),
331 __ATTR_RO(local_cpulist),
334 __ATTR_RO(numa_node),
336 __ATTR_RO(dma_mask_bits),
337 __ATTR_RO(consistent_dma_mask_bits),
338 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
339 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
340 broken_parity_status_show,broken_parity_status_store),
341 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
342 #ifdef CONFIG_HOTPLUG
343 __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
344 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
350 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
352 struct pci_dev *pdev = to_pci_dev(dev);
354 return sprintf(buf, "%u\n",
355 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
356 IORESOURCE_ROM_SHADOW));
358 struct device_attribute vga_attr = __ATTR_RO(boot_vga);
361 pci_read_config(struct file *filp, struct kobject *kobj,
362 struct bin_attribute *bin_attr,
363 char *buf, loff_t off, size_t count)
365 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
366 unsigned int size = 64;
367 loff_t init_off = off;
368 u8 *data = (u8*) buf;
370 /* Several chips lock up trying to read undefined config space */
371 if (cap_raised(filp->f_cred->cap_effective, CAP_SYS_ADMIN)) {
372 size = dev->cfg_size;
373 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
379 if (off + count > size) {
386 if ((off & 1) && size) {
388 pci_user_read_config_byte(dev, off, &val);
389 data[off - init_off] = val;
394 if ((off & 3) && size > 2) {
396 pci_user_read_config_word(dev, off, &val);
397 data[off - init_off] = val & 0xff;
398 data[off - init_off + 1] = (val >> 8) & 0xff;
405 pci_user_read_config_dword(dev, off, &val);
406 data[off - init_off] = val & 0xff;
407 data[off - init_off + 1] = (val >> 8) & 0xff;
408 data[off - init_off + 2] = (val >> 16) & 0xff;
409 data[off - init_off + 3] = (val >> 24) & 0xff;
416 pci_user_read_config_word(dev, off, &val);
417 data[off - init_off] = val & 0xff;
418 data[off - init_off + 1] = (val >> 8) & 0xff;
425 pci_user_read_config_byte(dev, off, &val);
426 data[off - init_off] = val;
435 pci_write_config(struct file* filp, struct kobject *kobj,
436 struct bin_attribute *bin_attr,
437 char *buf, loff_t off, size_t count)
439 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
440 unsigned int size = count;
441 loff_t init_off = off;
442 u8 *data = (u8*) buf;
444 if (off > dev->cfg_size)
446 if (off + count > dev->cfg_size) {
447 size = dev->cfg_size - off;
451 if ((off & 1) && size) {
452 pci_user_write_config_byte(dev, off, data[off - init_off]);
457 if ((off & 3) && size > 2) {
458 u16 val = data[off - init_off];
459 val |= (u16) data[off - init_off + 1] << 8;
460 pci_user_write_config_word(dev, off, val);
466 u32 val = data[off - init_off];
467 val |= (u32) data[off - init_off + 1] << 8;
468 val |= (u32) data[off - init_off + 2] << 16;
469 val |= (u32) data[off - init_off + 3] << 24;
470 pci_user_write_config_dword(dev, off, val);
476 u16 val = data[off - init_off];
477 val |= (u16) data[off - init_off + 1] << 8;
478 pci_user_write_config_word(dev, off, val);
484 pci_user_write_config_byte(dev, off, data[off - init_off]);
493 read_vpd_attr(struct file *filp, struct kobject *kobj,
494 struct bin_attribute *bin_attr,
495 char *buf, loff_t off, size_t count)
497 struct pci_dev *dev =
498 to_pci_dev(container_of(kobj, struct device, kobj));
500 if (off > bin_attr->size)
502 else if (count > bin_attr->size - off)
503 count = bin_attr->size - off;
505 return pci_read_vpd(dev, off, count, buf);
509 write_vpd_attr(struct file *filp, struct kobject *kobj,
510 struct bin_attribute *bin_attr,
511 char *buf, loff_t off, size_t count)
513 struct pci_dev *dev =
514 to_pci_dev(container_of(kobj, struct device, kobj));
516 if (off > bin_attr->size)
518 else if (count > bin_attr->size - off)
519 count = bin_attr->size - off;
521 return pci_write_vpd(dev, off, count, buf);
524 #ifdef HAVE_PCI_LEGACY
526 * pci_read_legacy_io - read byte(s) from legacy I/O port space
527 * @filp: open sysfs file
528 * @kobj: kobject corresponding to file to read from
529 * @bin_attr: struct bin_attribute for this file
530 * @buf: buffer to store results
531 * @off: offset into legacy I/O port space
532 * @count: number of bytes to read
534 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
535 * callback routine (pci_legacy_read).
538 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
539 struct bin_attribute *bin_attr,
540 char *buf, loff_t off, size_t count)
542 struct pci_bus *bus = to_pci_bus(container_of(kobj,
546 /* Only support 1, 2 or 4 byte accesses */
547 if (count != 1 && count != 2 && count != 4)
550 return pci_legacy_read(bus, off, (u32 *)buf, count);
554 * pci_write_legacy_io - write byte(s) to legacy I/O port space
555 * @filp: open sysfs file
556 * @kobj: kobject corresponding to file to read from
557 * @bin_attr: struct bin_attribute for this file
558 * @buf: buffer containing value to be written
559 * @off: offset into legacy I/O port space
560 * @count: number of bytes to write
562 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
563 * callback routine (pci_legacy_write).
566 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
567 struct bin_attribute *bin_attr,
568 char *buf, loff_t off, size_t count)
570 struct pci_bus *bus = to_pci_bus(container_of(kobj,
573 /* Only support 1, 2 or 4 byte accesses */
574 if (count != 1 && count != 2 && count != 4)
577 return pci_legacy_write(bus, off, *(u32 *)buf, count);
581 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
582 * @filp: open sysfs file
583 * @kobj: kobject corresponding to device to be mapped
584 * @attr: struct bin_attribute for this file
585 * @vma: struct vm_area_struct passed to mmap
587 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
588 * legacy memory space (first meg of bus space) into application virtual
592 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
593 struct bin_attribute *attr,
594 struct vm_area_struct *vma)
596 struct pci_bus *bus = to_pci_bus(container_of(kobj,
600 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
604 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
605 * @filp: open sysfs file
606 * @kobj: kobject corresponding to device to be mapped
607 * @attr: struct bin_attribute for this file
608 * @vma: struct vm_area_struct passed to mmap
610 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
611 * legacy IO space (first meg of bus space) into application virtual
612 * memory space. Returns -ENOSYS if the operation isn't supported
615 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
616 struct bin_attribute *attr,
617 struct vm_area_struct *vma)
619 struct pci_bus *bus = to_pci_bus(container_of(kobj,
623 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
627 * pci_adjust_legacy_attr - adjustment of legacy file attributes
628 * @b: bus to create files under
629 * @mmap_type: I/O port or memory
631 * Stub implementation. Can be overridden by arch if necessary.
634 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
640 * pci_create_legacy_files - create legacy I/O port and memory files
641 * @b: bus to create files under
643 * Some platforms allow access to legacy I/O port and ISA memory space on
644 * a per-bus basis. This routine creates the files and ties them into
645 * their associated read, write and mmap files from pci-sysfs.c
647 * On error unwind, but don't propogate the error to the caller
648 * as it is ok to set up the PCI bus without these files.
650 void pci_create_legacy_files(struct pci_bus *b)
654 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
659 sysfs_bin_attr_init(b->legacy_io);
660 b->legacy_io->attr.name = "legacy_io";
661 b->legacy_io->size = 0xffff;
662 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
663 b->legacy_io->read = pci_read_legacy_io;
664 b->legacy_io->write = pci_write_legacy_io;
665 b->legacy_io->mmap = pci_mmap_legacy_io;
666 pci_adjust_legacy_attr(b, pci_mmap_io);
667 error = device_create_bin_file(&b->dev, b->legacy_io);
671 /* Allocated above after the legacy_io struct */
672 b->legacy_mem = b->legacy_io + 1;
673 sysfs_bin_attr_init(b->legacy_mem);
674 b->legacy_mem->attr.name = "legacy_mem";
675 b->legacy_mem->size = 1024*1024;
676 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
677 b->legacy_mem->mmap = pci_mmap_legacy_mem;
678 pci_adjust_legacy_attr(b, pci_mmap_mem);
679 error = device_create_bin_file(&b->dev, b->legacy_mem);
686 device_remove_bin_file(&b->dev, b->legacy_io);
691 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
692 "and ISA memory resources to sysfs\n");
696 void pci_remove_legacy_files(struct pci_bus *b)
699 device_remove_bin_file(&b->dev, b->legacy_io);
700 device_remove_bin_file(&b->dev, b->legacy_mem);
701 kfree(b->legacy_io); /* both are allocated here */
704 #endif /* HAVE_PCI_LEGACY */
708 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma)
710 unsigned long nr, start, size;
712 nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
713 start = vma->vm_pgoff;
714 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
715 if (start < size && size - start >= nr)
717 WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n",
718 current->comm, start, start+nr, pci_name(pdev), resno, size);
723 * pci_mmap_resource - map a PCI resource into user memory space
724 * @kobj: kobject for mapping
725 * @attr: struct bin_attribute for the file being mapped
726 * @vma: struct vm_area_struct passed into the mmap
727 * @write_combine: 1 for write_combine mapping
729 * Use the regular PCI mapping routines to map a PCI resource into userspace.
732 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
733 struct vm_area_struct *vma, int write_combine)
735 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
736 struct device, kobj));
737 struct resource *res = attr->private;
738 enum pci_mmap_state mmap_type;
739 resource_size_t start, end;
742 for (i = 0; i < PCI_ROM_RESOURCE; i++)
743 if (res == &pdev->resource[i])
745 if (i >= PCI_ROM_RESOURCE)
748 if (!pci_mmap_fits(pdev, i, vma))
751 /* pci_mmap_page_range() expects the same kind of entry as coming
752 * from /proc/bus/pci/ which is a "user visible" value. If this is
753 * different from the resource itself, arch will do necessary fixup.
755 pci_resource_to_user(pdev, i, res, &start, &end);
756 vma->vm_pgoff += start >> PAGE_SHIFT;
757 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
759 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
762 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
766 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
767 struct bin_attribute *attr,
768 struct vm_area_struct *vma)
770 return pci_mmap_resource(kobj, attr, vma, 0);
774 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
775 struct bin_attribute *attr,
776 struct vm_area_struct *vma)
778 return pci_mmap_resource(kobj, attr, vma, 1);
782 pci_resource_io(struct file *filp, struct kobject *kobj,
783 struct bin_attribute *attr, char *buf,
784 loff_t off, size_t count, bool write)
786 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
787 struct device, kobj));
788 struct resource *res = attr->private;
789 unsigned long port = off;
792 for (i = 0; i < PCI_ROM_RESOURCE; i++)
793 if (res == &pdev->resource[i])
795 if (i >= PCI_ROM_RESOURCE)
798 port += pci_resource_start(pdev, i);
800 if (port > pci_resource_end(pdev, i))
803 if (port + count - 1 > pci_resource_end(pdev, i))
809 outb(*(u8 *)buf, port);
811 *(u8 *)buf = inb(port);
815 outw(*(u16 *)buf, port);
817 *(u16 *)buf = inw(port);
821 outl(*(u32 *)buf, port);
823 *(u32 *)buf = inl(port);
830 pci_read_resource_io(struct file *filp, struct kobject *kobj,
831 struct bin_attribute *attr, char *buf,
832 loff_t off, size_t count)
834 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
838 pci_write_resource_io(struct file *filp, struct kobject *kobj,
839 struct bin_attribute *attr, char *buf,
840 loff_t off, size_t count)
842 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
846 * pci_remove_resource_files - cleanup resource files
847 * @pdev: dev to cleanup
849 * If we created resource files for @pdev, remove them from sysfs and
850 * free their resources.
853 pci_remove_resource_files(struct pci_dev *pdev)
857 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
858 struct bin_attribute *res_attr;
860 res_attr = pdev->res_attr[i];
862 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
866 res_attr = pdev->res_attr_wc[i];
868 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
874 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
876 /* allocate attribute structure, piggyback attribute name */
877 int name_len = write_combine ? 13 : 10;
878 struct bin_attribute *res_attr;
881 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
883 char *res_attr_name = (char *)(res_attr + 1);
885 sysfs_bin_attr_init(res_attr);
887 pdev->res_attr_wc[num] = res_attr;
888 sprintf(res_attr_name, "resource%d_wc", num);
889 res_attr->mmap = pci_mmap_resource_wc;
891 pdev->res_attr[num] = res_attr;
892 sprintf(res_attr_name, "resource%d", num);
893 res_attr->mmap = pci_mmap_resource_uc;
895 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
896 res_attr->read = pci_read_resource_io;
897 res_attr->write = pci_write_resource_io;
899 res_attr->attr.name = res_attr_name;
900 res_attr->attr.mode = S_IRUSR | S_IWUSR;
901 res_attr->size = pci_resource_len(pdev, num);
902 res_attr->private = &pdev->resource[num];
903 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
911 * pci_create_resource_files - create resource files in sysfs for @dev
912 * @pdev: dev in question
914 * Walk the resources in @pdev creating files for each resource available.
916 static int pci_create_resource_files(struct pci_dev *pdev)
921 /* Expose the PCI resources from this device as files */
922 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
924 /* skip empty resources */
925 if (!pci_resource_len(pdev, i))
928 retval = pci_create_attr(pdev, i, 0);
929 /* for prefetchable resources, create a WC mappable file */
930 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
931 retval = pci_create_attr(pdev, i, 1);
934 pci_remove_resource_files(pdev);
940 #else /* !HAVE_PCI_MMAP */
941 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
942 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
943 #endif /* HAVE_PCI_MMAP */
946 * pci_write_rom - used to enable access to the PCI ROM display
948 * @kobj: kernel object handle
949 * @bin_attr: struct bin_attribute for this file
952 * @count: number of byte in input
954 * writing anything except 0 enables it
957 pci_write_rom(struct file *filp, struct kobject *kobj,
958 struct bin_attribute *bin_attr,
959 char *buf, loff_t off, size_t count)
961 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
963 if ((off == 0) && (*buf == '0') && (count == 2))
964 pdev->rom_attr_enabled = 0;
966 pdev->rom_attr_enabled = 1;
972 * pci_read_rom - read a PCI ROM
974 * @kobj: kernel object handle
975 * @bin_attr: struct bin_attribute for this file
976 * @buf: where to put the data we read from the ROM
978 * @count: number of bytes to read
980 * Put @count bytes starting at @off into @buf from the ROM in the PCI
981 * device corresponding to @kobj.
984 pci_read_rom(struct file *filp, struct kobject *kobj,
985 struct bin_attribute *bin_attr,
986 char *buf, loff_t off, size_t count)
988 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
992 if (!pdev->rom_attr_enabled)
995 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1002 if (off + count > size)
1005 memcpy_fromio(buf, rom + off, count);
1007 pci_unmap_rom(pdev, rom);
1012 static struct bin_attribute pci_config_attr = {
1015 .mode = S_IRUGO | S_IWUSR,
1017 .size = PCI_CFG_SPACE_SIZE,
1018 .read = pci_read_config,
1019 .write = pci_write_config,
1022 static struct bin_attribute pcie_config_attr = {
1025 .mode = S_IRUGO | S_IWUSR,
1027 .size = PCI_CFG_SPACE_EXP_SIZE,
1028 .read = pci_read_config,
1029 .write = pci_write_config,
1032 int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
1037 static ssize_t reset_store(struct device *dev,
1038 struct device_attribute *attr, const char *buf,
1041 struct pci_dev *pdev = to_pci_dev(dev);
1043 ssize_t result = strict_strtoul(buf, 0, &val);
1051 result = pci_reset_function(pdev);
1058 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1060 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1063 struct bin_attribute *attr;
1065 /* If the device has VPD, try to expose it in sysfs. */
1067 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1071 sysfs_bin_attr_init(attr);
1072 attr->size = dev->vpd->len;
1073 attr->attr.name = "vpd";
1074 attr->attr.mode = S_IRUSR | S_IWUSR;
1075 attr->read = read_vpd_attr;
1076 attr->write = write_vpd_attr;
1077 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1079 kfree(dev->vpd->attr);
1082 dev->vpd->attr = attr;
1085 /* Active State Power Management */
1086 pcie_aspm_create_sysfs_dev_files(dev);
1088 if (!pci_probe_reset_function(dev)) {
1089 retval = device_create_file(&dev->dev, &reset_attr);
1097 pcie_aspm_remove_sysfs_dev_files(dev);
1098 if (dev->vpd && dev->vpd->attr) {
1099 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1100 kfree(dev->vpd->attr);
1106 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1110 struct bin_attribute *attr;
1112 if (!sysfs_initialized)
1115 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1116 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1118 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1122 retval = pci_create_resource_files(pdev);
1124 goto err_config_file;
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 the device has a ROM, try to expose it in sysfs. */
1133 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1136 goto err_resource_files;
1138 sysfs_bin_attr_init(attr);
1139 attr->size = rom_size;
1140 attr->attr.name = "rom";
1141 attr->attr.mode = S_IRUSR;
1142 attr->read = pci_read_rom;
1143 attr->write = pci_write_rom;
1144 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1147 goto err_resource_files;
1149 pdev->rom_attr = attr;
1152 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1153 retval = device_create_file(&pdev->dev, &vga_attr);
1158 /* add platform-specific attributes */
1159 retval = pcibios_add_platform_entries(pdev);
1163 /* add sysfs entries for various capabilities */
1164 retval = pci_create_capabilities_sysfs(pdev);
1168 pci_create_firmware_label_files(pdev);
1173 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1174 device_remove_file(&pdev->dev, &vga_attr);
1177 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1178 kfree(pdev->rom_attr);
1179 pdev->rom_attr = NULL;
1182 pci_remove_resource_files(pdev);
1184 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1185 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1187 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1192 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1194 if (dev->vpd && dev->vpd->attr) {
1195 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1196 kfree(dev->vpd->attr);
1199 pcie_aspm_remove_sysfs_dev_files(dev);
1200 if (dev->reset_fn) {
1201 device_remove_file(&dev->dev, &reset_attr);
1207 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1208 * @pdev: device whose entries we should free
1210 * Cleanup when @pdev is removed from sysfs.
1212 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1216 if (!sysfs_initialized)
1219 pci_remove_capabilities_sysfs(pdev);
1221 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1222 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1224 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1226 pci_remove_resource_files(pdev);
1228 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1229 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1230 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1233 if (rom_size && pdev->rom_attr) {
1234 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1235 kfree(pdev->rom_attr);
1238 pci_remove_firmware_label_files(pdev);
1242 static int __init pci_sysfs_init(void)
1244 struct pci_dev *pdev = NULL;
1247 sysfs_initialized = 1;
1248 for_each_pci_dev(pdev) {
1249 retval = pci_create_sysfs_dev_files(pdev);
1259 late_initcall(pci_sysfs_init);