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/security.h>
27 #include <linux/pci-aspm.h>
28 #include <linux/slab.h>
31 static int sysfs_initialized; /* = 0 */
33 /* show configuration fields */
34 #define pci_config_attr(field, format_string) \
36 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
38 struct pci_dev *pdev; \
40 pdev = to_pci_dev (dev); \
41 return sprintf (buf, format_string, pdev->field); \
44 pci_config_attr(vendor, "0x%04x\n");
45 pci_config_attr(device, "0x%04x\n");
46 pci_config_attr(subsystem_vendor, "0x%04x\n");
47 pci_config_attr(subsystem_device, "0x%04x\n");
48 pci_config_attr(class, "0x%06x\n");
49 pci_config_attr(irq, "%u\n");
51 static ssize_t broken_parity_status_show(struct device *dev,
52 struct device_attribute *attr,
55 struct pci_dev *pdev = to_pci_dev(dev);
56 return sprintf (buf, "%u\n", pdev->broken_parity_status);
59 static ssize_t broken_parity_status_store(struct device *dev,
60 struct device_attribute *attr,
61 const char *buf, size_t count)
63 struct pci_dev *pdev = to_pci_dev(dev);
66 if (strict_strtoul(buf, 0, &val) < 0)
69 pdev->broken_parity_status = !!val;
74 static ssize_t local_cpus_show(struct device *dev,
75 struct device_attribute *attr, char *buf)
77 const struct cpumask *mask;
81 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
82 cpumask_of_node(dev_to_node(dev));
84 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
86 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
93 static ssize_t local_cpulist_show(struct device *dev,
94 struct device_attribute *attr, char *buf)
96 const struct cpumask *mask;
100 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
101 cpumask_of_node(dev_to_node(dev));
103 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
105 len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
113 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
115 struct pci_dev * pci_dev = to_pci_dev(dev);
119 resource_size_t start, end;
121 if (pci_dev->subordinate)
122 max = DEVICE_COUNT_RESOURCE;
124 max = PCI_BRIDGE_RESOURCES;
126 for (i = 0; i < max; i++) {
127 struct resource *res = &pci_dev->resource[i];
128 pci_resource_to_user(pci_dev, i, res, &start, &end);
129 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
130 (unsigned long long)start,
131 (unsigned long long)end,
132 (unsigned long long)res->flags);
137 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
139 struct pci_dev *pci_dev = to_pci_dev(dev);
141 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
142 pci_dev->vendor, pci_dev->device,
143 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
144 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
145 (u8)(pci_dev->class));
148 static ssize_t is_enabled_store(struct device *dev,
149 struct device_attribute *attr, const char *buf,
152 struct pci_dev *pdev = to_pci_dev(dev);
154 ssize_t result = strict_strtoul(buf, 0, &val);
159 /* this can crash the machine when done on the "wrong" device */
160 if (!capable(CAP_SYS_ADMIN))
164 if (pci_is_enabled(pdev))
165 pci_disable_device(pdev);
169 result = pci_enable_device(pdev);
171 return result < 0 ? result : count;
174 static ssize_t is_enabled_show(struct device *dev,
175 struct device_attribute *attr, char *buf)
177 struct pci_dev *pdev;
179 pdev = to_pci_dev (dev);
180 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
185 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
187 return sprintf (buf, "%d\n", dev->numa_node);
192 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
194 struct pci_dev *pdev = to_pci_dev(dev);
196 return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
200 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
203 return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
207 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
209 struct pci_dev *pdev = to_pci_dev(dev);
211 if (!pdev->subordinate)
214 return sprintf (buf, "%u\n",
215 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
219 msi_bus_store(struct device *dev, struct device_attribute *attr,
220 const char *buf, size_t count)
222 struct pci_dev *pdev = to_pci_dev(dev);
225 if (strict_strtoul(buf, 0, &val) < 0)
228 /* bad things may happen if the no_msi flag is changed
229 * while some drivers are loaded */
230 if (!capable(CAP_SYS_ADMIN))
233 /* Maybe pci devices without subordinate busses shouldn't even have this
234 * attribute in the first place? */
235 if (!pdev->subordinate)
238 /* Is the flag going to change, or keep the value it already had? */
239 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
241 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
243 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
244 " bad things could happen\n", val ? "" : " not");
250 #ifdef CONFIG_HOTPLUG
251 static DEFINE_MUTEX(pci_remove_rescan_mutex);
252 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
256 struct pci_bus *b = NULL;
258 if (strict_strtoul(buf, 0, &val) < 0)
262 mutex_lock(&pci_remove_rescan_mutex);
263 while ((b = pci_find_next_bus(b)) != NULL)
265 mutex_unlock(&pci_remove_rescan_mutex);
270 struct bus_attribute pci_bus_attrs[] = {
271 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
276 dev_rescan_store(struct device *dev, struct device_attribute *attr,
277 const char *buf, size_t count)
280 struct pci_dev *pdev = to_pci_dev(dev);
282 if (strict_strtoul(buf, 0, &val) < 0)
286 mutex_lock(&pci_remove_rescan_mutex);
287 pci_rescan_bus(pdev->bus);
288 mutex_unlock(&pci_remove_rescan_mutex);
293 static void remove_callback(struct device *dev)
295 struct pci_dev *pdev = to_pci_dev(dev);
297 mutex_lock(&pci_remove_rescan_mutex);
298 pci_remove_bus_device(pdev);
299 mutex_unlock(&pci_remove_rescan_mutex);
303 remove_store(struct device *dev, struct device_attribute *dummy,
304 const char *buf, size_t count)
309 if (strict_strtoul(buf, 0, &val) < 0)
312 /* An attribute cannot be unregistered by one of its own methods,
313 * so we have to use this roundabout approach.
316 ret = device_schedule_callback(dev, remove_callback);
323 struct device_attribute pci_dev_attrs[] = {
327 __ATTR_RO(subsystem_vendor),
328 __ATTR_RO(subsystem_device),
331 __ATTR_RO(local_cpus),
332 __ATTR_RO(local_cpulist),
335 __ATTR_RO(numa_node),
337 __ATTR_RO(dma_mask_bits),
338 __ATTR_RO(consistent_dma_mask_bits),
339 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
340 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
341 broken_parity_status_show,broken_parity_status_store),
342 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
343 #ifdef CONFIG_HOTPLUG
344 __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
345 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
351 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
353 struct pci_dev *pdev = to_pci_dev(dev);
355 return sprintf(buf, "%u\n",
356 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
357 IORESOURCE_ROM_SHADOW));
359 struct device_attribute vga_attr = __ATTR_RO(boot_vga);
362 pci_read_config(struct file *filp, struct kobject *kobj,
363 struct bin_attribute *bin_attr,
364 char *buf, loff_t off, size_t count)
366 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
367 unsigned int size = 64;
368 loff_t init_off = off;
369 u8 *data = (u8*) buf;
371 /* Several chips lock up trying to read undefined config space */
372 if (security_capable(&init_user_ns, filp->f_cred, CAP_SYS_ADMIN) == 0) {
373 size = dev->cfg_size;
374 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
380 if (off + count > size) {
387 if ((off & 1) && size) {
389 pci_user_read_config_byte(dev, off, &val);
390 data[off - init_off] = val;
395 if ((off & 3) && size > 2) {
397 pci_user_read_config_word(dev, off, &val);
398 data[off - init_off] = val & 0xff;
399 data[off - init_off + 1] = (val >> 8) & 0xff;
406 pci_user_read_config_dword(dev, off, &val);
407 data[off - init_off] = val & 0xff;
408 data[off - init_off + 1] = (val >> 8) & 0xff;
409 data[off - init_off + 2] = (val >> 16) & 0xff;
410 data[off - init_off + 3] = (val >> 24) & 0xff;
417 pci_user_read_config_word(dev, off, &val);
418 data[off - init_off] = val & 0xff;
419 data[off - init_off + 1] = (val >> 8) & 0xff;
426 pci_user_read_config_byte(dev, off, &val);
427 data[off - init_off] = val;
436 pci_write_config(struct file* filp, struct kobject *kobj,
437 struct bin_attribute *bin_attr,
438 char *buf, loff_t off, size_t count)
440 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
441 unsigned int size = count;
442 loff_t init_off = off;
443 u8 *data = (u8*) buf;
445 if (off > dev->cfg_size)
447 if (off + count > dev->cfg_size) {
448 size = dev->cfg_size - off;
452 if ((off & 1) && size) {
453 pci_user_write_config_byte(dev, off, data[off - init_off]);
458 if ((off & 3) && size > 2) {
459 u16 val = data[off - init_off];
460 val |= (u16) data[off - init_off + 1] << 8;
461 pci_user_write_config_word(dev, off, val);
467 u32 val = data[off - init_off];
468 val |= (u32) data[off - init_off + 1] << 8;
469 val |= (u32) data[off - init_off + 2] << 16;
470 val |= (u32) data[off - init_off + 3] << 24;
471 pci_user_write_config_dword(dev, off, val);
477 u16 val = data[off - init_off];
478 val |= (u16) data[off - init_off + 1] << 8;
479 pci_user_write_config_word(dev, off, val);
485 pci_user_write_config_byte(dev, off, data[off - init_off]);
494 read_vpd_attr(struct file *filp, struct kobject *kobj,
495 struct bin_attribute *bin_attr,
496 char *buf, loff_t off, size_t count)
498 struct pci_dev *dev =
499 to_pci_dev(container_of(kobj, struct device, kobj));
501 if (off > bin_attr->size)
503 else if (count > bin_attr->size - off)
504 count = bin_attr->size - off;
506 return pci_read_vpd(dev, off, count, buf);
510 write_vpd_attr(struct file *filp, struct kobject *kobj,
511 struct bin_attribute *bin_attr,
512 char *buf, loff_t off, size_t count)
514 struct pci_dev *dev =
515 to_pci_dev(container_of(kobj, struct device, kobj));
517 if (off > bin_attr->size)
519 else if (count > bin_attr->size - off)
520 count = bin_attr->size - off;
522 return pci_write_vpd(dev, off, count, buf);
525 #ifdef HAVE_PCI_LEGACY
527 * pci_read_legacy_io - read byte(s) from legacy I/O port space
528 * @filp: open sysfs file
529 * @kobj: kobject corresponding to file to read from
530 * @bin_attr: struct bin_attribute for this file
531 * @buf: buffer to store results
532 * @off: offset into legacy I/O port space
533 * @count: number of bytes to read
535 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
536 * callback routine (pci_legacy_read).
539 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
540 struct bin_attribute *bin_attr,
541 char *buf, loff_t off, size_t count)
543 struct pci_bus *bus = to_pci_bus(container_of(kobj,
547 /* Only support 1, 2 or 4 byte accesses */
548 if (count != 1 && count != 2 && count != 4)
551 return pci_legacy_read(bus, off, (u32 *)buf, count);
555 * pci_write_legacy_io - write byte(s) to legacy I/O port space
556 * @filp: open sysfs file
557 * @kobj: kobject corresponding to file to read from
558 * @bin_attr: struct bin_attribute for this file
559 * @buf: buffer containing value to be written
560 * @off: offset into legacy I/O port space
561 * @count: number of bytes to write
563 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
564 * callback routine (pci_legacy_write).
567 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
568 struct bin_attribute *bin_attr,
569 char *buf, loff_t off, size_t count)
571 struct pci_bus *bus = to_pci_bus(container_of(kobj,
574 /* Only support 1, 2 or 4 byte accesses */
575 if (count != 1 && count != 2 && count != 4)
578 return pci_legacy_write(bus, off, *(u32 *)buf, count);
582 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
583 * @filp: open sysfs file
584 * @kobj: kobject corresponding to device to be mapped
585 * @attr: struct bin_attribute for this file
586 * @vma: struct vm_area_struct passed to mmap
588 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
589 * legacy memory space (first meg of bus space) into application virtual
593 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
594 struct bin_attribute *attr,
595 struct vm_area_struct *vma)
597 struct pci_bus *bus = to_pci_bus(container_of(kobj,
601 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
605 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
606 * @filp: open sysfs file
607 * @kobj: kobject corresponding to device to be mapped
608 * @attr: struct bin_attribute for this file
609 * @vma: struct vm_area_struct passed to mmap
611 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
612 * legacy IO space (first meg of bus space) into application virtual
613 * memory space. Returns -ENOSYS if the operation isn't supported
616 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
617 struct bin_attribute *attr,
618 struct vm_area_struct *vma)
620 struct pci_bus *bus = to_pci_bus(container_of(kobj,
624 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
628 * pci_adjust_legacy_attr - adjustment of legacy file attributes
629 * @b: bus to create files under
630 * @mmap_type: I/O port or memory
632 * Stub implementation. Can be overridden by arch if necessary.
635 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
641 * pci_create_legacy_files - create legacy I/O port and memory files
642 * @b: bus to create files under
644 * Some platforms allow access to legacy I/O port and ISA memory space on
645 * a per-bus basis. This routine creates the files and ties them into
646 * their associated read, write and mmap files from pci-sysfs.c
648 * On error unwind, but don't propagate the error to the caller
649 * as it is ok to set up the PCI bus without these files.
651 void pci_create_legacy_files(struct pci_bus *b)
655 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
660 sysfs_bin_attr_init(b->legacy_io);
661 b->legacy_io->attr.name = "legacy_io";
662 b->legacy_io->size = 0xffff;
663 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
664 b->legacy_io->read = pci_read_legacy_io;
665 b->legacy_io->write = pci_write_legacy_io;
666 b->legacy_io->mmap = pci_mmap_legacy_io;
667 pci_adjust_legacy_attr(b, pci_mmap_io);
668 error = device_create_bin_file(&b->dev, b->legacy_io);
672 /* Allocated above after the legacy_io struct */
673 b->legacy_mem = b->legacy_io + 1;
674 sysfs_bin_attr_init(b->legacy_mem);
675 b->legacy_mem->attr.name = "legacy_mem";
676 b->legacy_mem->size = 1024*1024;
677 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
678 b->legacy_mem->mmap = pci_mmap_legacy_mem;
679 pci_adjust_legacy_attr(b, pci_mmap_mem);
680 error = device_create_bin_file(&b->dev, b->legacy_mem);
687 device_remove_bin_file(&b->dev, b->legacy_io);
692 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
693 "and ISA memory resources to sysfs\n");
697 void pci_remove_legacy_files(struct pci_bus *b)
700 device_remove_bin_file(&b->dev, b->legacy_io);
701 device_remove_bin_file(&b->dev, b->legacy_mem);
702 kfree(b->legacy_io); /* both are allocated here */
705 #endif /* HAVE_PCI_LEGACY */
709 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
710 enum pci_mmap_api mmap_api)
712 unsigned long nr, start, size, pci_start;
714 if (pci_resource_len(pdev, resno) == 0)
716 nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
717 start = vma->vm_pgoff;
718 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
719 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
720 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
721 if (start >= pci_start && start < pci_start + size &&
722 start + nr <= pci_start + size)
728 * pci_mmap_resource - map a PCI resource into user memory space
729 * @kobj: kobject for mapping
730 * @attr: struct bin_attribute for the file being mapped
731 * @vma: struct vm_area_struct passed into the mmap
732 * @write_combine: 1 for write_combine mapping
734 * Use the regular PCI mapping routines to map a PCI resource into userspace.
737 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
738 struct vm_area_struct *vma, int write_combine)
740 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
741 struct device, kobj));
742 struct resource *res = attr->private;
743 enum pci_mmap_state mmap_type;
744 resource_size_t start, end;
747 for (i = 0; i < PCI_ROM_RESOURCE; i++)
748 if (res == &pdev->resource[i])
750 if (i >= PCI_ROM_RESOURCE)
753 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
754 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
755 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
756 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
758 (u64)pci_resource_start(pdev, i),
759 (u64)pci_resource_len(pdev, i));
763 /* pci_mmap_page_range() expects the same kind of entry as coming
764 * from /proc/bus/pci/ which is a "user visible" value. If this is
765 * different from the resource itself, arch will do necessary fixup.
767 pci_resource_to_user(pdev, i, res, &start, &end);
768 vma->vm_pgoff += start >> PAGE_SHIFT;
769 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
771 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
774 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
778 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
779 struct bin_attribute *attr,
780 struct vm_area_struct *vma)
782 return pci_mmap_resource(kobj, attr, vma, 0);
786 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
787 struct bin_attribute *attr,
788 struct vm_area_struct *vma)
790 return pci_mmap_resource(kobj, attr, vma, 1);
794 pci_resource_io(struct file *filp, struct kobject *kobj,
795 struct bin_attribute *attr, char *buf,
796 loff_t off, size_t count, bool write)
798 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
799 struct device, kobj));
800 struct resource *res = attr->private;
801 unsigned long port = off;
804 for (i = 0; i < PCI_ROM_RESOURCE; i++)
805 if (res == &pdev->resource[i])
807 if (i >= PCI_ROM_RESOURCE)
810 port += pci_resource_start(pdev, i);
812 if (port > pci_resource_end(pdev, i))
815 if (port + count - 1 > pci_resource_end(pdev, i))
821 outb(*(u8 *)buf, port);
823 *(u8 *)buf = inb(port);
827 outw(*(u16 *)buf, port);
829 *(u16 *)buf = inw(port);
833 outl(*(u32 *)buf, port);
835 *(u32 *)buf = inl(port);
842 pci_read_resource_io(struct file *filp, struct kobject *kobj,
843 struct bin_attribute *attr, char *buf,
844 loff_t off, size_t count)
846 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
850 pci_write_resource_io(struct file *filp, struct kobject *kobj,
851 struct bin_attribute *attr, char *buf,
852 loff_t off, size_t count)
854 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
858 * pci_remove_resource_files - cleanup resource files
859 * @pdev: dev to cleanup
861 * If we created resource files for @pdev, remove them from sysfs and
862 * free their resources.
865 pci_remove_resource_files(struct pci_dev *pdev)
869 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
870 struct bin_attribute *res_attr;
872 res_attr = pdev->res_attr[i];
874 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
878 res_attr = pdev->res_attr_wc[i];
880 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
886 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
888 /* allocate attribute structure, piggyback attribute name */
889 int name_len = write_combine ? 13 : 10;
890 struct bin_attribute *res_attr;
893 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
895 char *res_attr_name = (char *)(res_attr + 1);
897 sysfs_bin_attr_init(res_attr);
899 pdev->res_attr_wc[num] = res_attr;
900 sprintf(res_attr_name, "resource%d_wc", num);
901 res_attr->mmap = pci_mmap_resource_wc;
903 pdev->res_attr[num] = res_attr;
904 sprintf(res_attr_name, "resource%d", num);
905 res_attr->mmap = pci_mmap_resource_uc;
907 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
908 res_attr->read = pci_read_resource_io;
909 res_attr->write = pci_write_resource_io;
911 res_attr->attr.name = res_attr_name;
912 res_attr->attr.mode = S_IRUSR | S_IWUSR;
913 res_attr->size = pci_resource_len(pdev, num);
914 res_attr->private = &pdev->resource[num];
915 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
923 * pci_create_resource_files - create resource files in sysfs for @dev
924 * @pdev: dev in question
926 * Walk the resources in @pdev creating files for each resource available.
928 static int pci_create_resource_files(struct pci_dev *pdev)
933 /* Expose the PCI resources from this device as files */
934 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
936 /* skip empty resources */
937 if (!pci_resource_len(pdev, i))
940 retval = pci_create_attr(pdev, i, 0);
941 /* for prefetchable resources, create a WC mappable file */
942 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
943 retval = pci_create_attr(pdev, i, 1);
946 pci_remove_resource_files(pdev);
952 #else /* !HAVE_PCI_MMAP */
953 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
954 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
955 #endif /* HAVE_PCI_MMAP */
958 * pci_write_rom - used to enable access to the PCI ROM display
960 * @kobj: kernel object handle
961 * @bin_attr: struct bin_attribute for this file
964 * @count: number of byte in input
966 * writing anything except 0 enables it
969 pci_write_rom(struct file *filp, struct kobject *kobj,
970 struct bin_attribute *bin_attr,
971 char *buf, loff_t off, size_t count)
973 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
975 if ((off == 0) && (*buf == '0') && (count == 2))
976 pdev->rom_attr_enabled = 0;
978 pdev->rom_attr_enabled = 1;
984 * pci_read_rom - read a PCI ROM
986 * @kobj: kernel object handle
987 * @bin_attr: struct bin_attribute for this file
988 * @buf: where to put the data we read from the ROM
990 * @count: number of bytes to read
992 * Put @count bytes starting at @off into @buf from the ROM in the PCI
993 * device corresponding to @kobj.
996 pci_read_rom(struct file *filp, struct kobject *kobj,
997 struct bin_attribute *bin_attr,
998 char *buf, loff_t off, size_t count)
1000 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1004 if (!pdev->rom_attr_enabled)
1007 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1014 if (off + count > size)
1017 memcpy_fromio(buf, rom + off, count);
1019 pci_unmap_rom(pdev, rom);
1024 static struct bin_attribute pci_config_attr = {
1027 .mode = S_IRUGO | S_IWUSR,
1029 .size = PCI_CFG_SPACE_SIZE,
1030 .read = pci_read_config,
1031 .write = pci_write_config,
1034 static struct bin_attribute pcie_config_attr = {
1037 .mode = S_IRUGO | S_IWUSR,
1039 .size = PCI_CFG_SPACE_EXP_SIZE,
1040 .read = pci_read_config,
1041 .write = pci_write_config,
1044 int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
1049 static ssize_t reset_store(struct device *dev,
1050 struct device_attribute *attr, const char *buf,
1053 struct pci_dev *pdev = to_pci_dev(dev);
1055 ssize_t result = strict_strtoul(buf, 0, &val);
1063 result = pci_reset_function(pdev);
1070 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1072 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1075 struct bin_attribute *attr;
1077 /* If the device has VPD, try to expose it in sysfs. */
1079 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1083 sysfs_bin_attr_init(attr);
1084 attr->size = dev->vpd->len;
1085 attr->attr.name = "vpd";
1086 attr->attr.mode = S_IRUSR | S_IWUSR;
1087 attr->read = read_vpd_attr;
1088 attr->write = write_vpd_attr;
1089 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1094 dev->vpd->attr = attr;
1097 /* Active State Power Management */
1098 pcie_aspm_create_sysfs_dev_files(dev);
1100 if (!pci_probe_reset_function(dev)) {
1101 retval = device_create_file(&dev->dev, &reset_attr);
1109 pcie_aspm_remove_sysfs_dev_files(dev);
1110 if (dev->vpd && dev->vpd->attr) {
1111 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1112 kfree(dev->vpd->attr);
1118 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1122 struct bin_attribute *attr;
1124 if (!sysfs_initialized)
1127 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1128 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1130 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1134 retval = pci_create_resource_files(pdev);
1136 goto err_config_file;
1138 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1139 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1140 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1143 /* If the device has a ROM, try to expose it in sysfs. */
1145 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1148 goto err_resource_files;
1150 sysfs_bin_attr_init(attr);
1151 attr->size = rom_size;
1152 attr->attr.name = "rom";
1153 attr->attr.mode = S_IRUSR | S_IWUSR;
1154 attr->read = pci_read_rom;
1155 attr->write = pci_write_rom;
1156 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1159 goto err_resource_files;
1161 pdev->rom_attr = attr;
1164 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1165 retval = device_create_file(&pdev->dev, &vga_attr);
1170 /* add platform-specific attributes */
1171 retval = pcibios_add_platform_entries(pdev);
1175 /* add sysfs entries for various capabilities */
1176 retval = pci_create_capabilities_sysfs(pdev);
1180 pci_create_firmware_label_files(pdev);
1185 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1186 device_remove_file(&pdev->dev, &vga_attr);
1189 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1190 kfree(pdev->rom_attr);
1191 pdev->rom_attr = NULL;
1194 pci_remove_resource_files(pdev);
1196 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1197 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1199 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1204 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1206 if (dev->vpd && dev->vpd->attr) {
1207 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1208 kfree(dev->vpd->attr);
1211 pcie_aspm_remove_sysfs_dev_files(dev);
1212 if (dev->reset_fn) {
1213 device_remove_file(&dev->dev, &reset_attr);
1219 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1220 * @pdev: device whose entries we should free
1222 * Cleanup when @pdev is removed from sysfs.
1224 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1228 if (!sysfs_initialized)
1231 pci_remove_capabilities_sysfs(pdev);
1233 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1234 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1236 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1238 pci_remove_resource_files(pdev);
1240 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1241 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1242 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1245 if (rom_size && pdev->rom_attr) {
1246 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1247 kfree(pdev->rom_attr);
1250 pci_remove_firmware_label_files(pdev);
1254 static int __init pci_sysfs_init(void)
1256 struct pci_dev *pdev = NULL;
1259 sysfs_initialized = 1;
1260 for_each_pci_dev(pdev) {
1261 retval = pci_create_sysfs_dev_files(pdev);
1271 late_initcall(pci_sysfs_init);