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/export.h>
23 #include <linux/topology.h>
26 #include <linux/capability.h>
27 #include <linux/security.h>
28 #include <linux/pci-aspm.h>
29 #include <linux/slab.h>
30 #include <linux/vgaarb.h>
31 #include <linux/pm_runtime.h>
35 static int sysfs_initialized; /* = 0 */
37 /* show configuration fields */
38 #define pci_config_attr(field, format_string) \
40 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
42 struct pci_dev *pdev; \
44 pdev = to_pci_dev (dev); \
45 return sprintf (buf, format_string, pdev->field); \
47 static DEVICE_ATTR_RO(field)
49 pci_config_attr(vendor, "0x%04x\n");
50 pci_config_attr(device, "0x%04x\n");
51 pci_config_attr(subsystem_vendor, "0x%04x\n");
52 pci_config_attr(subsystem_device, "0x%04x\n");
53 pci_config_attr(class, "0x%06x\n");
54 pci_config_attr(irq, "%u\n");
56 static ssize_t broken_parity_status_show(struct device *dev,
57 struct device_attribute *attr,
60 struct pci_dev *pdev = to_pci_dev(dev);
61 return sprintf (buf, "%u\n", pdev->broken_parity_status);
64 static ssize_t broken_parity_status_store(struct device *dev,
65 struct device_attribute *attr,
66 const char *buf, size_t count)
68 struct pci_dev *pdev = to_pci_dev(dev);
71 if (kstrtoul(buf, 0, &val) < 0)
74 pdev->broken_parity_status = !!val;
78 static DEVICE_ATTR_RW(broken_parity_status);
80 static ssize_t pci_dev_show_local_cpu(struct device *dev,
82 struct device_attribute *attr,
85 const struct cpumask *mask;
89 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
90 cpumask_of_node(dev_to_node(dev));
92 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
95 cpumask_scnprintf(buf, PAGE_SIZE-2, mask) :
96 cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
103 static ssize_t local_cpus_show(struct device *dev,
104 struct device_attribute *attr, char *buf)
106 return pci_dev_show_local_cpu(dev, 1, attr, buf);
108 static DEVICE_ATTR_RO(local_cpus);
110 static ssize_t local_cpulist_show(struct device *dev,
111 struct device_attribute *attr, char *buf)
113 return pci_dev_show_local_cpu(dev, 0, attr, buf);
115 static DEVICE_ATTR_RO(local_cpulist);
118 * PCI Bus Class Devices
120 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
122 struct device_attribute *attr,
126 const struct cpumask *cpumask;
128 cpumask = cpumask_of_pcibus(to_pci_bus(dev));
130 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
131 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
137 static ssize_t cpuaffinity_show(struct device *dev,
138 struct device_attribute *attr, char *buf)
140 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
142 static DEVICE_ATTR_RO(cpuaffinity);
144 static ssize_t cpulistaffinity_show(struct device *dev,
145 struct device_attribute *attr, char *buf)
147 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
149 static DEVICE_ATTR_RO(cpulistaffinity);
153 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
155 struct pci_dev * pci_dev = to_pci_dev(dev);
159 resource_size_t start, end;
161 if (pci_dev->subordinate)
162 max = DEVICE_COUNT_RESOURCE;
164 max = PCI_BRIDGE_RESOURCES;
166 for (i = 0; i < max; i++) {
167 struct resource *res = &pci_dev->resource[i];
168 pci_resource_to_user(pci_dev, i, res, &start, &end);
169 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
170 (unsigned long long)start,
171 (unsigned long long)end,
172 (unsigned long long)res->flags);
176 static DEVICE_ATTR_RO(resource);
178 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
180 struct pci_dev *pci_dev = to_pci_dev(dev);
182 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
183 pci_dev->vendor, pci_dev->device,
184 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
185 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
186 (u8)(pci_dev->class));
188 static DEVICE_ATTR_RO(modalias);
190 static ssize_t enabled_store(struct device *dev,
191 struct device_attribute *attr, const char *buf,
194 struct pci_dev *pdev = to_pci_dev(dev);
196 ssize_t result = kstrtoul(buf, 0, &val);
201 /* this can crash the machine when done on the "wrong" device */
202 if (!capable(CAP_SYS_ADMIN))
206 if (pci_is_enabled(pdev))
207 pci_disable_device(pdev);
211 result = pci_enable_device(pdev);
213 return result < 0 ? result : count;
216 static ssize_t enabled_show(struct device *dev,
217 struct device_attribute *attr, char *buf)
219 struct pci_dev *pdev;
221 pdev = to_pci_dev (dev);
222 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
224 static DEVICE_ATTR_RW(enabled);
228 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
230 return sprintf (buf, "%d\n", dev->numa_node);
232 static DEVICE_ATTR_RO(numa_node);
236 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
238 struct pci_dev *pdev = to_pci_dev(dev);
240 return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
242 static DEVICE_ATTR_RO(dma_mask_bits);
245 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
248 return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
250 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
253 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
255 struct pci_dev *pdev = to_pci_dev(dev);
257 if (!pdev->subordinate)
260 return sprintf (buf, "%u\n",
261 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
265 msi_bus_store(struct device *dev, struct device_attribute *attr,
266 const char *buf, size_t count)
268 struct pci_dev *pdev = to_pci_dev(dev);
271 if (kstrtoul(buf, 0, &val) < 0)
275 * Bad things may happen if the no_msi flag is changed
276 * while drivers are loaded.
278 if (!capable(CAP_SYS_ADMIN))
282 * Maybe devices without subordinate buses shouldn't have this
283 * attribute in the first place?
285 if (!pdev->subordinate)
288 /* Is the flag going to change, or keep the value it already had? */
289 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
291 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
293 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
294 " bad things could happen\n", val ? "" : " not");
299 static DEVICE_ATTR_RW(msi_bus);
301 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
305 struct pci_bus *b = NULL;
307 if (kstrtoul(buf, 0, &val) < 0)
311 pci_lock_rescan_remove();
312 while ((b = pci_find_next_bus(b)) != NULL)
314 pci_unlock_rescan_remove();
318 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
320 static struct attribute *pci_bus_attrs[] = {
321 &bus_attr_rescan.attr,
325 static const struct attribute_group pci_bus_group = {
326 .attrs = pci_bus_attrs,
329 const struct attribute_group *pci_bus_groups[] = {
335 dev_rescan_store(struct device *dev, struct device_attribute *attr,
336 const char *buf, size_t count)
339 struct pci_dev *pdev = to_pci_dev(dev);
341 if (kstrtoul(buf, 0, &val) < 0)
345 pci_lock_rescan_remove();
346 pci_rescan_bus(pdev->bus);
347 pci_unlock_rescan_remove();
351 static struct device_attribute dev_rescan_attr = __ATTR(rescan,
353 NULL, dev_rescan_store);
356 remove_store(struct device *dev, struct device_attribute *attr,
357 const char *buf, size_t count)
361 if (kstrtoul(buf, 0, &val) < 0)
364 if (val && device_remove_file_self(dev, attr))
365 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
368 static struct device_attribute dev_remove_attr = __ATTR(remove,
373 dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
374 const char *buf, size_t count)
377 struct pci_bus *bus = to_pci_bus(dev);
379 if (kstrtoul(buf, 0, &val) < 0)
383 pci_lock_rescan_remove();
384 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
385 pci_rescan_bus_bridge_resize(bus->self);
388 pci_unlock_rescan_remove();
392 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
394 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
395 static ssize_t d3cold_allowed_store(struct device *dev,
396 struct device_attribute *attr,
397 const char *buf, size_t count)
399 struct pci_dev *pdev = to_pci_dev(dev);
402 if (kstrtoul(buf, 0, &val) < 0)
405 pdev->d3cold_allowed = !!val;
406 pm_runtime_resume(dev);
411 static ssize_t d3cold_allowed_show(struct device *dev,
412 struct device_attribute *attr, char *buf)
414 struct pci_dev *pdev = to_pci_dev(dev);
415 return sprintf (buf, "%u\n", pdev->d3cold_allowed);
417 static DEVICE_ATTR_RW(d3cold_allowed);
421 static ssize_t devspec_show(struct device *dev,
422 struct device_attribute *attr, char *buf)
424 struct pci_dev *pdev = to_pci_dev(dev);
425 struct device_node *np = pci_device_to_OF_node(pdev);
427 if (np == NULL || np->full_name == NULL)
429 return sprintf(buf, "%s", np->full_name);
431 static DEVICE_ATTR_RO(devspec);
434 #ifdef CONFIG_PCI_IOV
435 static ssize_t sriov_totalvfs_show(struct device *dev,
436 struct device_attribute *attr,
439 struct pci_dev *pdev = to_pci_dev(dev);
441 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
445 static ssize_t sriov_numvfs_show(struct device *dev,
446 struct device_attribute *attr,
449 struct pci_dev *pdev = to_pci_dev(dev);
451 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
455 * num_vfs > 0; number of VFs to enable
456 * num_vfs = 0; disable all VFs
458 * Note: SRIOV spec doesn't allow partial VF
459 * disable, so it's all or none.
461 static ssize_t sriov_numvfs_store(struct device *dev,
462 struct device_attribute *attr,
463 const char *buf, size_t count)
465 struct pci_dev *pdev = to_pci_dev(dev);
469 ret = kstrtou16(buf, 0, &num_vfs);
473 if (num_vfs > pci_sriov_get_totalvfs(pdev))
476 if (num_vfs == pdev->sriov->num_VFs)
477 return count; /* no change */
479 /* is PF driver loaded w/callback */
480 if (!pdev->driver || !pdev->driver->sriov_configure) {
481 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
487 ret = pdev->driver->sriov_configure(pdev, 0);
494 if (pdev->sriov->num_VFs) {
495 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
496 pdev->sriov->num_VFs, num_vfs);
500 ret = pdev->driver->sriov_configure(pdev, num_vfs);
505 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
511 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
512 static struct device_attribute sriov_numvfs_attr =
513 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
514 sriov_numvfs_show, sriov_numvfs_store);
515 #endif /* CONFIG_PCI_IOV */
517 static ssize_t driver_override_store(struct device *dev,
518 struct device_attribute *attr,
519 const char *buf, size_t count)
521 struct pci_dev *pdev = to_pci_dev(dev);
522 char *driver_override, *old = pdev->driver_override, *cp;
524 if (count > PATH_MAX)
527 driver_override = kstrndup(buf, count, GFP_KERNEL);
528 if (!driver_override)
531 cp = strchr(driver_override, '\n');
535 if (strlen(driver_override)) {
536 pdev->driver_override = driver_override;
538 kfree(driver_override);
539 pdev->driver_override = NULL;
547 static ssize_t driver_override_show(struct device *dev,
548 struct device_attribute *attr, char *buf)
550 struct pci_dev *pdev = to_pci_dev(dev);
552 return sprintf(buf, "%s\n", pdev->driver_override);
554 static DEVICE_ATTR_RW(driver_override);
556 static struct attribute *pci_dev_attrs[] = {
557 &dev_attr_resource.attr,
558 &dev_attr_vendor.attr,
559 &dev_attr_device.attr,
560 &dev_attr_subsystem_vendor.attr,
561 &dev_attr_subsystem_device.attr,
562 &dev_attr_class.attr,
564 &dev_attr_local_cpus.attr,
565 &dev_attr_local_cpulist.attr,
566 &dev_attr_modalias.attr,
568 &dev_attr_numa_node.attr,
570 &dev_attr_dma_mask_bits.attr,
571 &dev_attr_consistent_dma_mask_bits.attr,
572 &dev_attr_enabled.attr,
573 &dev_attr_broken_parity_status.attr,
574 &dev_attr_msi_bus.attr,
575 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
576 &dev_attr_d3cold_allowed.attr,
579 &dev_attr_devspec.attr,
581 &dev_attr_driver_override.attr,
585 static const struct attribute_group pci_dev_group = {
586 .attrs = pci_dev_attrs,
589 const struct attribute_group *pci_dev_groups[] = {
594 static struct attribute *pcibus_attrs[] = {
595 &dev_attr_rescan.attr,
596 &dev_attr_cpuaffinity.attr,
597 &dev_attr_cpulistaffinity.attr,
601 static const struct attribute_group pcibus_group = {
602 .attrs = pcibus_attrs,
605 const struct attribute_group *pcibus_groups[] = {
611 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
613 struct pci_dev *pdev = to_pci_dev(dev);
614 struct pci_dev *vga_dev = vga_default_device();
617 return sprintf(buf, "%u\n", (pdev == vga_dev));
619 return sprintf(buf, "%u\n",
620 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
621 IORESOURCE_ROM_SHADOW));
623 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
626 pci_read_config(struct file *filp, struct kobject *kobj,
627 struct bin_attribute *bin_attr,
628 char *buf, loff_t off, size_t count)
630 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
631 unsigned int size = 64;
632 loff_t init_off = off;
633 u8 *data = (u8*) buf;
635 /* Several chips lock up trying to read undefined config space */
636 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
637 size = dev->cfg_size;
638 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
644 if (off + count > size) {
651 pci_config_pm_runtime_get(dev);
653 if ((off & 1) && size) {
655 pci_user_read_config_byte(dev, off, &val);
656 data[off - init_off] = val;
661 if ((off & 3) && size > 2) {
663 pci_user_read_config_word(dev, off, &val);
664 data[off - init_off] = val & 0xff;
665 data[off - init_off + 1] = (val >> 8) & 0xff;
672 pci_user_read_config_dword(dev, off, &val);
673 data[off - init_off] = val & 0xff;
674 data[off - init_off + 1] = (val >> 8) & 0xff;
675 data[off - init_off + 2] = (val >> 16) & 0xff;
676 data[off - init_off + 3] = (val >> 24) & 0xff;
683 pci_user_read_config_word(dev, off, &val);
684 data[off - init_off] = val & 0xff;
685 data[off - init_off + 1] = (val >> 8) & 0xff;
692 pci_user_read_config_byte(dev, off, &val);
693 data[off - init_off] = val;
698 pci_config_pm_runtime_put(dev);
704 pci_write_config(struct file* filp, struct kobject *kobj,
705 struct bin_attribute *bin_attr,
706 char *buf, loff_t off, size_t count)
708 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
709 unsigned int size = count;
710 loff_t init_off = off;
711 u8 *data = (u8*) buf;
713 if (off > dev->cfg_size)
715 if (off + count > dev->cfg_size) {
716 size = dev->cfg_size - off;
720 pci_config_pm_runtime_get(dev);
722 if ((off & 1) && size) {
723 pci_user_write_config_byte(dev, off, data[off - init_off]);
728 if ((off & 3) && size > 2) {
729 u16 val = data[off - init_off];
730 val |= (u16) data[off - init_off + 1] << 8;
731 pci_user_write_config_word(dev, off, val);
737 u32 val = data[off - init_off];
738 val |= (u32) data[off - init_off + 1] << 8;
739 val |= (u32) data[off - init_off + 2] << 16;
740 val |= (u32) data[off - init_off + 3] << 24;
741 pci_user_write_config_dword(dev, off, val);
747 u16 val = data[off - init_off];
748 val |= (u16) data[off - init_off + 1] << 8;
749 pci_user_write_config_word(dev, off, val);
755 pci_user_write_config_byte(dev, off, data[off - init_off]);
760 pci_config_pm_runtime_put(dev);
766 read_vpd_attr(struct file *filp, struct kobject *kobj,
767 struct bin_attribute *bin_attr,
768 char *buf, loff_t off, size_t count)
770 struct pci_dev *dev =
771 to_pci_dev(container_of(kobj, struct device, kobj));
773 if (off > bin_attr->size)
775 else if (count > bin_attr->size - off)
776 count = bin_attr->size - off;
778 return pci_read_vpd(dev, off, count, buf);
782 write_vpd_attr(struct file *filp, struct kobject *kobj,
783 struct bin_attribute *bin_attr,
784 char *buf, loff_t off, size_t count)
786 struct pci_dev *dev =
787 to_pci_dev(container_of(kobj, struct device, kobj));
789 if (off > bin_attr->size)
791 else if (count > bin_attr->size - off)
792 count = bin_attr->size - off;
794 return pci_write_vpd(dev, off, count, buf);
797 #ifdef HAVE_PCI_LEGACY
799 * pci_read_legacy_io - read byte(s) from legacy I/O port space
800 * @filp: open sysfs file
801 * @kobj: kobject corresponding to file to read from
802 * @bin_attr: struct bin_attribute for this file
803 * @buf: buffer to store results
804 * @off: offset into legacy I/O port space
805 * @count: number of bytes to read
807 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
808 * callback routine (pci_legacy_read).
811 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
812 struct bin_attribute *bin_attr,
813 char *buf, loff_t off, size_t count)
815 struct pci_bus *bus = to_pci_bus(container_of(kobj,
819 /* Only support 1, 2 or 4 byte accesses */
820 if (count != 1 && count != 2 && count != 4)
823 return pci_legacy_read(bus, off, (u32 *)buf, count);
827 * pci_write_legacy_io - write byte(s) to legacy I/O port space
828 * @filp: open sysfs file
829 * @kobj: kobject corresponding to file to read from
830 * @bin_attr: struct bin_attribute for this file
831 * @buf: buffer containing value to be written
832 * @off: offset into legacy I/O port space
833 * @count: number of bytes to write
835 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
836 * callback routine (pci_legacy_write).
839 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
840 struct bin_attribute *bin_attr,
841 char *buf, loff_t off, size_t count)
843 struct pci_bus *bus = to_pci_bus(container_of(kobj,
846 /* Only support 1, 2 or 4 byte accesses */
847 if (count != 1 && count != 2 && count != 4)
850 return pci_legacy_write(bus, off, *(u32 *)buf, count);
854 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
855 * @filp: open sysfs file
856 * @kobj: kobject corresponding to device to be mapped
857 * @attr: struct bin_attribute for this file
858 * @vma: struct vm_area_struct passed to mmap
860 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
861 * legacy memory space (first meg of bus space) into application virtual
865 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
866 struct bin_attribute *attr,
867 struct vm_area_struct *vma)
869 struct pci_bus *bus = to_pci_bus(container_of(kobj,
873 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
877 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
878 * @filp: open sysfs file
879 * @kobj: kobject corresponding to device to be mapped
880 * @attr: struct bin_attribute for this file
881 * @vma: struct vm_area_struct passed to mmap
883 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
884 * legacy IO space (first meg of bus space) into application virtual
885 * memory space. Returns -ENOSYS if the operation isn't supported
888 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
889 struct bin_attribute *attr,
890 struct vm_area_struct *vma)
892 struct pci_bus *bus = to_pci_bus(container_of(kobj,
896 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
900 * pci_adjust_legacy_attr - adjustment of legacy file attributes
901 * @b: bus to create files under
902 * @mmap_type: I/O port or memory
904 * Stub implementation. Can be overridden by arch if necessary.
907 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
913 * pci_create_legacy_files - create legacy I/O port and memory files
914 * @b: bus to create files under
916 * Some platforms allow access to legacy I/O port and ISA memory space on
917 * a per-bus basis. This routine creates the files and ties them into
918 * their associated read, write and mmap files from pci-sysfs.c
920 * On error unwind, but don't propagate the error to the caller
921 * as it is ok to set up the PCI bus without these files.
923 void pci_create_legacy_files(struct pci_bus *b)
927 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
932 sysfs_bin_attr_init(b->legacy_io);
933 b->legacy_io->attr.name = "legacy_io";
934 b->legacy_io->size = 0xffff;
935 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
936 b->legacy_io->read = pci_read_legacy_io;
937 b->legacy_io->write = pci_write_legacy_io;
938 b->legacy_io->mmap = pci_mmap_legacy_io;
939 pci_adjust_legacy_attr(b, pci_mmap_io);
940 error = device_create_bin_file(&b->dev, b->legacy_io);
944 /* Allocated above after the legacy_io struct */
945 b->legacy_mem = b->legacy_io + 1;
946 sysfs_bin_attr_init(b->legacy_mem);
947 b->legacy_mem->attr.name = "legacy_mem";
948 b->legacy_mem->size = 1024*1024;
949 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
950 b->legacy_mem->mmap = pci_mmap_legacy_mem;
951 pci_adjust_legacy_attr(b, pci_mmap_mem);
952 error = device_create_bin_file(&b->dev, b->legacy_mem);
959 device_remove_bin_file(&b->dev, b->legacy_io);
964 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
965 "and ISA memory resources to sysfs\n");
969 void pci_remove_legacy_files(struct pci_bus *b)
972 device_remove_bin_file(&b->dev, b->legacy_io);
973 device_remove_bin_file(&b->dev, b->legacy_mem);
974 kfree(b->legacy_io); /* both are allocated here */
977 #endif /* HAVE_PCI_LEGACY */
981 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
982 enum pci_mmap_api mmap_api)
984 unsigned long nr, start, size, pci_start;
986 if (pci_resource_len(pdev, resno) == 0)
989 start = vma->vm_pgoff;
990 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
991 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
992 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
993 if (start >= pci_start && start < pci_start + size &&
994 start + nr <= pci_start + size)
1000 * pci_mmap_resource - map a PCI resource into user memory space
1001 * @kobj: kobject for mapping
1002 * @attr: struct bin_attribute for the file being mapped
1003 * @vma: struct vm_area_struct passed into the mmap
1004 * @write_combine: 1 for write_combine mapping
1006 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1009 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1010 struct vm_area_struct *vma, int write_combine)
1012 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1013 struct device, kobj));
1014 struct resource *res = attr->private;
1015 enum pci_mmap_state mmap_type;
1016 resource_size_t start, end;
1019 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1020 if (res == &pdev->resource[i])
1022 if (i >= PCI_ROM_RESOURCE)
1025 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
1026 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
1027 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
1028 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
1030 (u64)pci_resource_start(pdev, i),
1031 (u64)pci_resource_len(pdev, i));
1035 /* pci_mmap_page_range() expects the same kind of entry as coming
1036 * from /proc/bus/pci/ which is a "user visible" value. If this is
1037 * different from the resource itself, arch will do necessary fixup.
1039 pci_resource_to_user(pdev, i, res, &start, &end);
1040 vma->vm_pgoff += start >> PAGE_SHIFT;
1041 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1043 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
1046 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1050 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1051 struct bin_attribute *attr,
1052 struct vm_area_struct *vma)
1054 return pci_mmap_resource(kobj, attr, vma, 0);
1058 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1059 struct bin_attribute *attr,
1060 struct vm_area_struct *vma)
1062 return pci_mmap_resource(kobj, attr, vma, 1);
1066 pci_resource_io(struct file *filp, struct kobject *kobj,
1067 struct bin_attribute *attr, char *buf,
1068 loff_t off, size_t count, bool write)
1070 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1071 struct device, kobj));
1072 struct resource *res = attr->private;
1073 unsigned long port = off;
1076 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1077 if (res == &pdev->resource[i])
1079 if (i >= PCI_ROM_RESOURCE)
1082 port += pci_resource_start(pdev, i);
1084 if (port > pci_resource_end(pdev, i))
1087 if (port + count - 1 > pci_resource_end(pdev, i))
1093 outb(*(u8 *)buf, port);
1095 *(u8 *)buf = inb(port);
1099 outw(*(u16 *)buf, port);
1101 *(u16 *)buf = inw(port);
1105 outl(*(u32 *)buf, port);
1107 *(u32 *)buf = inl(port);
1114 pci_read_resource_io(struct file *filp, struct kobject *kobj,
1115 struct bin_attribute *attr, char *buf,
1116 loff_t off, size_t count)
1118 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1122 pci_write_resource_io(struct file *filp, struct kobject *kobj,
1123 struct bin_attribute *attr, char *buf,
1124 loff_t off, size_t count)
1126 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1130 * pci_remove_resource_files - cleanup resource files
1131 * @pdev: dev to cleanup
1133 * If we created resource files for @pdev, remove them from sysfs and
1134 * free their resources.
1137 pci_remove_resource_files(struct pci_dev *pdev)
1141 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1142 struct bin_attribute *res_attr;
1144 res_attr = pdev->res_attr[i];
1146 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1150 res_attr = pdev->res_attr_wc[i];
1152 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1158 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1160 /* allocate attribute structure, piggyback attribute name */
1161 int name_len = write_combine ? 13 : 10;
1162 struct bin_attribute *res_attr;
1165 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1167 char *res_attr_name = (char *)(res_attr + 1);
1169 sysfs_bin_attr_init(res_attr);
1170 if (write_combine) {
1171 pdev->res_attr_wc[num] = res_attr;
1172 sprintf(res_attr_name, "resource%d_wc", num);
1173 res_attr->mmap = pci_mmap_resource_wc;
1175 pdev->res_attr[num] = res_attr;
1176 sprintf(res_attr_name, "resource%d", num);
1177 res_attr->mmap = pci_mmap_resource_uc;
1179 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1180 res_attr->read = pci_read_resource_io;
1181 res_attr->write = pci_write_resource_io;
1183 res_attr->attr.name = res_attr_name;
1184 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1185 res_attr->size = pci_resource_len(pdev, num);
1186 res_attr->private = &pdev->resource[num];
1187 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1195 * pci_create_resource_files - create resource files in sysfs for @dev
1196 * @pdev: dev in question
1198 * Walk the resources in @pdev creating files for each resource available.
1200 static int pci_create_resource_files(struct pci_dev *pdev)
1205 /* Expose the PCI resources from this device as files */
1206 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1208 /* skip empty resources */
1209 if (!pci_resource_len(pdev, i))
1212 retval = pci_create_attr(pdev, i, 0);
1213 /* for prefetchable resources, create a WC mappable file */
1214 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1215 retval = pci_create_attr(pdev, i, 1);
1218 pci_remove_resource_files(pdev);
1224 #else /* !HAVE_PCI_MMAP */
1225 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1226 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1227 #endif /* HAVE_PCI_MMAP */
1230 * pci_write_rom - used to enable access to the PCI ROM display
1232 * @kobj: kernel object handle
1233 * @bin_attr: struct bin_attribute for this file
1236 * @count: number of byte in input
1238 * writing anything except 0 enables it
1241 pci_write_rom(struct file *filp, struct kobject *kobj,
1242 struct bin_attribute *bin_attr,
1243 char *buf, loff_t off, size_t count)
1245 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1247 if ((off == 0) && (*buf == '0') && (count == 2))
1248 pdev->rom_attr_enabled = 0;
1250 pdev->rom_attr_enabled = 1;
1256 * pci_read_rom - read a PCI ROM
1258 * @kobj: kernel object handle
1259 * @bin_attr: struct bin_attribute for this file
1260 * @buf: where to put the data we read from the ROM
1262 * @count: number of bytes to read
1264 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1265 * device corresponding to @kobj.
1268 pci_read_rom(struct file *filp, struct kobject *kobj,
1269 struct bin_attribute *bin_attr,
1270 char *buf, loff_t off, size_t count)
1272 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1276 if (!pdev->rom_attr_enabled)
1279 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1286 if (off + count > size)
1289 memcpy_fromio(buf, rom + off, count);
1291 pci_unmap_rom(pdev, rom);
1296 static struct bin_attribute pci_config_attr = {
1299 .mode = S_IRUGO | S_IWUSR,
1301 .size = PCI_CFG_SPACE_SIZE,
1302 .read = pci_read_config,
1303 .write = pci_write_config,
1306 static struct bin_attribute pcie_config_attr = {
1309 .mode = S_IRUGO | S_IWUSR,
1311 .size = PCI_CFG_SPACE_EXP_SIZE,
1312 .read = pci_read_config,
1313 .write = pci_write_config,
1316 static ssize_t reset_store(struct device *dev,
1317 struct device_attribute *attr, const char *buf,
1320 struct pci_dev *pdev = to_pci_dev(dev);
1322 ssize_t result = kstrtoul(buf, 0, &val);
1330 result = pci_reset_function(pdev);
1337 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1339 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1342 struct bin_attribute *attr;
1344 /* If the device has VPD, try to expose it in sysfs. */
1346 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1350 sysfs_bin_attr_init(attr);
1351 attr->size = dev->vpd->len;
1352 attr->attr.name = "vpd";
1353 attr->attr.mode = S_IRUSR | S_IWUSR;
1354 attr->read = read_vpd_attr;
1355 attr->write = write_vpd_attr;
1356 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1361 dev->vpd->attr = attr;
1364 /* Active State Power Management */
1365 pcie_aspm_create_sysfs_dev_files(dev);
1367 if (!pci_probe_reset_function(dev)) {
1368 retval = device_create_file(&dev->dev, &reset_attr);
1376 pcie_aspm_remove_sysfs_dev_files(dev);
1377 if (dev->vpd && dev->vpd->attr) {
1378 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1379 kfree(dev->vpd->attr);
1385 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1389 struct bin_attribute *attr;
1391 if (!sysfs_initialized)
1394 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1395 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1397 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1401 retval = pci_create_resource_files(pdev);
1403 goto err_config_file;
1405 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1406 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1407 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1410 /* If the device has a ROM, try to expose it in sysfs. */
1412 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1415 goto err_resource_files;
1417 sysfs_bin_attr_init(attr);
1418 attr->size = rom_size;
1419 attr->attr.name = "rom";
1420 attr->attr.mode = S_IRUSR | S_IWUSR;
1421 attr->read = pci_read_rom;
1422 attr->write = pci_write_rom;
1423 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1426 goto err_resource_files;
1428 pdev->rom_attr = attr;
1431 /* add sysfs entries for various capabilities */
1432 retval = pci_create_capabilities_sysfs(pdev);
1436 pci_create_firmware_label_files(pdev);
1442 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1443 kfree(pdev->rom_attr);
1444 pdev->rom_attr = NULL;
1447 pci_remove_resource_files(pdev);
1449 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1450 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1452 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1457 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1459 if (dev->vpd && dev->vpd->attr) {
1460 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1461 kfree(dev->vpd->attr);
1464 pcie_aspm_remove_sysfs_dev_files(dev);
1465 if (dev->reset_fn) {
1466 device_remove_file(&dev->dev, &reset_attr);
1472 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1473 * @pdev: device whose entries we should free
1475 * Cleanup when @pdev is removed from sysfs.
1477 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1481 if (!sysfs_initialized)
1484 pci_remove_capabilities_sysfs(pdev);
1486 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1487 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1489 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1491 pci_remove_resource_files(pdev);
1493 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1494 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1495 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1498 if (rom_size && pdev->rom_attr) {
1499 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1500 kfree(pdev->rom_attr);
1503 pci_remove_firmware_label_files(pdev);
1507 static int __init pci_sysfs_init(void)
1509 struct pci_dev *pdev = NULL;
1512 sysfs_initialized = 1;
1513 for_each_pci_dev(pdev) {
1514 retval = pci_create_sysfs_dev_files(pdev);
1524 late_initcall(pci_sysfs_init);
1526 static struct attribute *pci_dev_dev_attrs[] = {
1531 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1532 struct attribute *a, int n)
1534 struct device *dev = container_of(kobj, struct device, kobj);
1535 struct pci_dev *pdev = to_pci_dev(dev);
1537 if (a == &vga_attr.attr)
1538 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1544 static struct attribute *pci_dev_hp_attrs[] = {
1545 &dev_remove_attr.attr,
1546 &dev_rescan_attr.attr,
1550 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1551 struct attribute *a, int n)
1553 struct device *dev = container_of(kobj, struct device, kobj);
1554 struct pci_dev *pdev = to_pci_dev(dev);
1556 if (pdev->is_virtfn)
1562 static struct attribute_group pci_dev_hp_attr_group = {
1563 .attrs = pci_dev_hp_attrs,
1564 .is_visible = pci_dev_hp_attrs_are_visible,
1567 #ifdef CONFIG_PCI_IOV
1568 static struct attribute *sriov_dev_attrs[] = {
1569 &sriov_totalvfs_attr.attr,
1570 &sriov_numvfs_attr.attr,
1574 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1575 struct attribute *a, int n)
1577 struct device *dev = container_of(kobj, struct device, kobj);
1579 if (!dev_is_pf(dev))
1585 static struct attribute_group sriov_dev_attr_group = {
1586 .attrs = sriov_dev_attrs,
1587 .is_visible = sriov_attrs_are_visible,
1589 #endif /* CONFIG_PCI_IOV */
1591 static struct attribute_group pci_dev_attr_group = {
1592 .attrs = pci_dev_dev_attrs,
1593 .is_visible = pci_dev_attrs_are_visible,
1596 static const struct attribute_group *pci_dev_attr_groups[] = {
1597 &pci_dev_attr_group,
1598 &pci_dev_hp_attr_group,
1599 #ifdef CONFIG_PCI_IOV
1600 &sriov_dev_attr_group,
1605 struct device_type pci_dev_type = {
1606 .groups = pci_dev_attr_groups,