2 * drivers/pci/pci-sysfs.c
5 * (C) Copyright 2002-2004 IBM Corp.
6 * (C) Copyright 2003 Matthew Wilcox
7 * (C) Copyright 2003 Hewlett-Packard
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, int type,
81 struct device_attribute *attr, char *buf)
83 const struct cpumask *mask;
87 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
88 cpumask_of_node(dev_to_node(dev));
90 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
93 cpumask_scnprintf(buf, PAGE_SIZE-2, mask) :
94 cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
101 static ssize_t local_cpus_show(struct device *dev,
102 struct device_attribute *attr, char *buf)
104 return pci_dev_show_local_cpu(dev, 1, attr, buf);
106 static DEVICE_ATTR_RO(local_cpus);
108 static ssize_t local_cpulist_show(struct device *dev,
109 struct device_attribute *attr, char *buf)
111 return pci_dev_show_local_cpu(dev, 0, attr, buf);
113 static DEVICE_ATTR_RO(local_cpulist);
116 * PCI Bus Class Devices
118 static ssize_t pci_bus_show_cpuaffinity(struct device *dev, int type,
119 struct device_attribute *attr,
123 const struct cpumask *cpumask;
125 cpumask = cpumask_of_pcibus(to_pci_bus(dev));
127 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
128 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
134 static ssize_t cpuaffinity_show(struct device *dev,
135 struct device_attribute *attr, char *buf)
137 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
139 static DEVICE_ATTR_RO(cpuaffinity);
141 static ssize_t cpulistaffinity_show(struct device *dev,
142 struct device_attribute *attr, char *buf)
144 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
146 static DEVICE_ATTR_RO(cpulistaffinity);
149 static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
152 struct pci_dev *pci_dev = to_pci_dev(dev);
156 resource_size_t start, end;
158 if (pci_dev->subordinate)
159 max = DEVICE_COUNT_RESOURCE;
161 max = PCI_BRIDGE_RESOURCES;
163 for (i = 0; i < max; i++) {
164 struct resource *res = &pci_dev->resource[i];
165 pci_resource_to_user(pci_dev, i, res, &start, &end);
166 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
167 (unsigned long long)start,
168 (unsigned long long)end,
169 (unsigned long long)res->flags);
173 static DEVICE_ATTR_RO(resource);
175 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
178 struct pci_dev *pci_dev = to_pci_dev(dev);
180 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
181 pci_dev->vendor, pci_dev->device,
182 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
183 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
184 (u8)(pci_dev->class));
186 static DEVICE_ATTR_RO(modalias);
188 static ssize_t enabled_store(struct device *dev, struct device_attribute *attr,
189 const char *buf, size_t count)
191 struct pci_dev *pdev = to_pci_dev(dev);
193 ssize_t result = kstrtoul(buf, 0, &val);
198 /* this can crash the machine when done on the "wrong" device */
199 if (!capable(CAP_SYS_ADMIN))
203 if (pci_is_enabled(pdev))
204 pci_disable_device(pdev);
208 result = pci_enable_device(pdev);
210 return result < 0 ? result : count;
213 static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
216 struct pci_dev *pdev;
218 pdev = to_pci_dev(dev);
219 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
221 static DEVICE_ATTR_RW(enabled);
224 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
227 return sprintf(buf, "%d\n", dev->numa_node);
229 static DEVICE_ATTR_RO(numa_node);
232 static ssize_t dma_mask_bits_show(struct device *dev,
233 struct device_attribute *attr, char *buf)
235 struct pci_dev *pdev = to_pci_dev(dev);
237 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
239 static DEVICE_ATTR_RO(dma_mask_bits);
241 static ssize_t consistent_dma_mask_bits_show(struct device *dev,
242 struct device_attribute *attr,
245 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
247 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
249 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
252 struct pci_dev *pdev = to_pci_dev(dev);
254 if (!pdev->subordinate)
257 return sprintf(buf, "%u\n",
258 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
261 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
262 const char *buf, size_t count)
264 struct pci_dev *pdev = to_pci_dev(dev);
267 if (kstrtoul(buf, 0, &val) < 0)
271 * Bad things may happen if the no_msi flag is changed
272 * while drivers are loaded.
274 if (!capable(CAP_SYS_ADMIN))
278 * Maybe devices without subordinate buses shouldn't have this
279 * attribute in the first place?
281 if (!pdev->subordinate)
284 /* Is the flag going to change, or keep the value it already had? */
285 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
287 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
289 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI, bad things could happen\n",
295 static DEVICE_ATTR_RW(msi_bus);
297 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
301 struct pci_bus *b = NULL;
303 if (kstrtoul(buf, 0, &val) < 0)
307 pci_lock_rescan_remove();
308 while ((b = pci_find_next_bus(b)) != NULL)
310 pci_unlock_rescan_remove();
314 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
316 static struct attribute *pci_bus_attrs[] = {
317 &bus_attr_rescan.attr,
321 static const struct attribute_group pci_bus_group = {
322 .attrs = pci_bus_attrs,
325 const struct attribute_group *pci_bus_groups[] = {
330 static ssize_t dev_rescan_store(struct device *dev,
331 struct device_attribute *attr, const char *buf,
335 struct pci_dev *pdev = to_pci_dev(dev);
337 if (kstrtoul(buf, 0, &val) < 0)
341 pci_lock_rescan_remove();
342 pci_rescan_bus(pdev->bus);
343 pci_unlock_rescan_remove();
347 static struct device_attribute dev_rescan_attr = __ATTR(rescan,
349 NULL, dev_rescan_store);
351 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
352 const char *buf, size_t count)
356 if (kstrtoul(buf, 0, &val) < 0)
359 if (val && device_remove_file_self(dev, attr))
360 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
363 static struct device_attribute dev_remove_attr = __ATTR(remove,
367 static ssize_t dev_bus_rescan_store(struct device *dev,
368 struct device_attribute *attr,
369 const char *buf, size_t count)
372 struct pci_bus *bus = to_pci_bus(dev);
374 if (kstrtoul(buf, 0, &val) < 0)
378 pci_lock_rescan_remove();
379 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
380 pci_rescan_bus_bridge_resize(bus->self);
383 pci_unlock_rescan_remove();
387 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
389 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
390 static ssize_t d3cold_allowed_store(struct device *dev,
391 struct device_attribute *attr,
392 const char *buf, size_t count)
394 struct pci_dev *pdev = to_pci_dev(dev);
397 if (kstrtoul(buf, 0, &val) < 0)
400 pdev->d3cold_allowed = !!val;
401 pm_runtime_resume(dev);
406 static ssize_t d3cold_allowed_show(struct device *dev,
407 struct device_attribute *attr, char *buf)
409 struct pci_dev *pdev = to_pci_dev(dev);
410 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
412 static DEVICE_ATTR_RW(d3cold_allowed);
416 static ssize_t devspec_show(struct device *dev,
417 struct device_attribute *attr, char *buf)
419 struct pci_dev *pdev = to_pci_dev(dev);
420 struct device_node *np = pci_device_to_OF_node(pdev);
422 if (np == NULL || np->full_name == NULL)
424 return sprintf(buf, "%s", np->full_name);
426 static DEVICE_ATTR_RO(devspec);
429 #ifdef CONFIG_PCI_IOV
430 static ssize_t sriov_totalvfs_show(struct device *dev,
431 struct device_attribute *attr,
434 struct pci_dev *pdev = to_pci_dev(dev);
436 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
440 static ssize_t sriov_numvfs_show(struct device *dev,
441 struct device_attribute *attr,
444 struct pci_dev *pdev = to_pci_dev(dev);
446 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
450 * num_vfs > 0; number of VFs to enable
451 * num_vfs = 0; disable all VFs
453 * Note: SRIOV spec doesn't allow partial VF
454 * disable, so it's all or none.
456 static ssize_t sriov_numvfs_store(struct device *dev,
457 struct device_attribute *attr,
458 const char *buf, size_t count)
460 struct pci_dev *pdev = to_pci_dev(dev);
464 ret = kstrtou16(buf, 0, &num_vfs);
468 if (num_vfs > pci_sriov_get_totalvfs(pdev))
471 if (num_vfs == pdev->sriov->num_VFs)
472 return count; /* no change */
474 /* is PF driver loaded w/callback */
475 if (!pdev->driver || !pdev->driver->sriov_configure) {
476 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
482 ret = pdev->driver->sriov_configure(pdev, 0);
489 if (pdev->sriov->num_VFs) {
490 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
491 pdev->sriov->num_VFs, num_vfs);
495 ret = pdev->driver->sriov_configure(pdev, num_vfs);
500 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
506 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
507 static struct device_attribute sriov_numvfs_attr =
508 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
509 sriov_numvfs_show, sriov_numvfs_store);
510 #endif /* CONFIG_PCI_IOV */
512 static ssize_t driver_override_store(struct device *dev,
513 struct device_attribute *attr,
514 const char *buf, size_t count)
516 struct pci_dev *pdev = to_pci_dev(dev);
517 char *driver_override, *old = pdev->driver_override, *cp;
519 if (count > PATH_MAX)
522 driver_override = kstrndup(buf, count, GFP_KERNEL);
523 if (!driver_override)
526 cp = strchr(driver_override, '\n');
530 if (strlen(driver_override)) {
531 pdev->driver_override = driver_override;
533 kfree(driver_override);
534 pdev->driver_override = NULL;
542 static ssize_t driver_override_show(struct device *dev,
543 struct device_attribute *attr, char *buf)
545 struct pci_dev *pdev = to_pci_dev(dev);
547 return sprintf(buf, "%s\n", pdev->driver_override);
549 static DEVICE_ATTR_RW(driver_override);
551 static struct attribute *pci_dev_attrs[] = {
552 &dev_attr_resource.attr,
553 &dev_attr_vendor.attr,
554 &dev_attr_device.attr,
555 &dev_attr_subsystem_vendor.attr,
556 &dev_attr_subsystem_device.attr,
557 &dev_attr_class.attr,
559 &dev_attr_local_cpus.attr,
560 &dev_attr_local_cpulist.attr,
561 &dev_attr_modalias.attr,
563 &dev_attr_numa_node.attr,
565 &dev_attr_dma_mask_bits.attr,
566 &dev_attr_consistent_dma_mask_bits.attr,
567 &dev_attr_enabled.attr,
568 &dev_attr_broken_parity_status.attr,
569 &dev_attr_msi_bus.attr,
570 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
571 &dev_attr_d3cold_allowed.attr,
574 &dev_attr_devspec.attr,
576 &dev_attr_driver_override.attr,
580 static const struct attribute_group pci_dev_group = {
581 .attrs = pci_dev_attrs,
584 const struct attribute_group *pci_dev_groups[] = {
589 static struct attribute *pcibus_attrs[] = {
590 &dev_attr_rescan.attr,
591 &dev_attr_cpuaffinity.attr,
592 &dev_attr_cpulistaffinity.attr,
596 static const struct attribute_group pcibus_group = {
597 .attrs = pcibus_attrs,
600 const struct attribute_group *pcibus_groups[] = {
605 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
608 struct pci_dev *pdev = to_pci_dev(dev);
609 struct pci_dev *vga_dev = vga_default_device();
612 return sprintf(buf, "%u\n", (pdev == vga_dev));
614 return sprintf(buf, "%u\n",
615 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
616 IORESOURCE_ROM_SHADOW));
618 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
620 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
621 struct bin_attribute *bin_attr, char *buf,
622 loff_t off, size_t count)
624 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device,
626 unsigned int size = 64;
627 loff_t init_off = off;
628 u8 *data = (u8 *) buf;
630 /* Several chips lock up trying to read undefined config space */
631 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0)
632 size = dev->cfg_size;
633 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
638 if (off + count > size) {
645 pci_config_pm_runtime_get(dev);
647 if ((off & 1) && size) {
649 pci_user_read_config_byte(dev, off, &val);
650 data[off - init_off] = val;
655 if ((off & 3) && size > 2) {
657 pci_user_read_config_word(dev, off, &val);
658 data[off - init_off] = val & 0xff;
659 data[off - init_off + 1] = (val >> 8) & 0xff;
666 pci_user_read_config_dword(dev, off, &val);
667 data[off - init_off] = val & 0xff;
668 data[off - init_off + 1] = (val >> 8) & 0xff;
669 data[off - init_off + 2] = (val >> 16) & 0xff;
670 data[off - init_off + 3] = (val >> 24) & 0xff;
677 pci_user_read_config_word(dev, off, &val);
678 data[off - init_off] = val & 0xff;
679 data[off - init_off + 1] = (val >> 8) & 0xff;
686 pci_user_read_config_byte(dev, off, &val);
687 data[off - init_off] = val;
692 pci_config_pm_runtime_put(dev);
697 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
698 struct bin_attribute *bin_attr, char *buf,
699 loff_t off, size_t count)
701 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device,
703 unsigned int size = count;
704 loff_t init_off = off;
705 u8 *data = (u8 *) buf;
707 if (off > dev->cfg_size)
709 if (off + count > dev->cfg_size) {
710 size = dev->cfg_size - off;
714 pci_config_pm_runtime_get(dev);
716 if ((off & 1) && size) {
717 pci_user_write_config_byte(dev, off, data[off - init_off]);
722 if ((off & 3) && size > 2) {
723 u16 val = data[off - init_off];
724 val |= (u16) data[off - init_off + 1] << 8;
725 pci_user_write_config_word(dev, off, val);
731 u32 val = data[off - init_off];
732 val |= (u32) data[off - init_off + 1] << 8;
733 val |= (u32) data[off - init_off + 2] << 16;
734 val |= (u32) data[off - init_off + 3] << 24;
735 pci_user_write_config_dword(dev, off, val);
741 u16 val = data[off - init_off];
742 val |= (u16) data[off - init_off + 1] << 8;
743 pci_user_write_config_word(dev, off, val);
749 pci_user_write_config_byte(dev, off, data[off - init_off]);
754 pci_config_pm_runtime_put(dev);
759 static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
760 struct bin_attribute *bin_attr, char *buf,
761 loff_t off, size_t count)
763 struct pci_dev *dev =
764 to_pci_dev(container_of(kobj, struct device, kobj));
766 if (off > bin_attr->size)
768 else if (count > bin_attr->size - off)
769 count = bin_attr->size - off;
771 return pci_read_vpd(dev, off, count, buf);
774 static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
775 struct bin_attribute *bin_attr, char *buf,
776 loff_t off, size_t count)
778 struct pci_dev *dev =
779 to_pci_dev(container_of(kobj, struct device, kobj));
781 if (off > bin_attr->size)
783 else if (count > bin_attr->size - off)
784 count = bin_attr->size - off;
786 return pci_write_vpd(dev, off, count, buf);
789 #ifdef HAVE_PCI_LEGACY
791 * pci_read_legacy_io - read byte(s) from legacy I/O port space
792 * @filp: open sysfs file
793 * @kobj: kobject corresponding to file to read from
794 * @bin_attr: struct bin_attribute for this file
795 * @buf: buffer to store results
796 * @off: offset into legacy I/O port space
797 * @count: number of bytes to read
799 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
800 * callback routine (pci_legacy_read).
802 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
803 struct bin_attribute *bin_attr, char *buf,
804 loff_t off, size_t count)
806 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
809 /* Only support 1, 2 or 4 byte accesses */
810 if (count != 1 && count != 2 && count != 4)
813 return pci_legacy_read(bus, off, (u32 *)buf, count);
817 * pci_write_legacy_io - write byte(s) to legacy I/O port space
818 * @filp: open sysfs file
819 * @kobj: kobject corresponding to file to read from
820 * @bin_attr: struct bin_attribute for this file
821 * @buf: buffer containing value to be written
822 * @off: offset into legacy I/O port space
823 * @count: number of bytes to write
825 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
826 * callback routine (pci_legacy_write).
828 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
829 struct bin_attribute *bin_attr, char *buf,
830 loff_t off, size_t count)
832 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
835 /* Only support 1, 2 or 4 byte accesses */
836 if (count != 1 && count != 2 && count != 4)
839 return pci_legacy_write(bus, off, *(u32 *)buf, count);
843 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
844 * @filp: open sysfs file
845 * @kobj: kobject corresponding to device to be mapped
846 * @attr: struct bin_attribute for this file
847 * @vma: struct vm_area_struct passed to mmap
849 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
850 * legacy memory space (first meg of bus space) into application virtual
853 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
854 struct bin_attribute *attr,
855 struct vm_area_struct *vma)
857 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
860 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
864 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
865 * @filp: open sysfs file
866 * @kobj: kobject corresponding to device to be mapped
867 * @attr: struct bin_attribute for this file
868 * @vma: struct vm_area_struct passed to mmap
870 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
871 * legacy IO space (first meg of bus space) into application virtual
872 * memory space. Returns -ENOSYS if the operation isn't supported
874 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
875 struct bin_attribute *attr,
876 struct vm_area_struct *vma)
878 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
881 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
885 * pci_adjust_legacy_attr - adjustment of legacy file attributes
886 * @b: bus to create files under
887 * @mmap_type: I/O port or memory
889 * Stub implementation. Can be overridden by arch if necessary.
891 void __weak pci_adjust_legacy_attr(struct pci_bus *b,
892 enum pci_mmap_state mmap_type)
897 * pci_create_legacy_files - create legacy I/O port and memory files
898 * @b: bus to create files under
900 * Some platforms allow access to legacy I/O port and ISA memory space on
901 * a per-bus basis. This routine creates the files and ties them into
902 * their associated read, write and mmap files from pci-sysfs.c
904 * On error unwind, but don't propagate the error to the caller
905 * as it is ok to set up the PCI bus without these files.
907 void pci_create_legacy_files(struct pci_bus *b)
911 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
916 sysfs_bin_attr_init(b->legacy_io);
917 b->legacy_io->attr.name = "legacy_io";
918 b->legacy_io->size = 0xffff;
919 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
920 b->legacy_io->read = pci_read_legacy_io;
921 b->legacy_io->write = pci_write_legacy_io;
922 b->legacy_io->mmap = pci_mmap_legacy_io;
923 pci_adjust_legacy_attr(b, pci_mmap_io);
924 error = device_create_bin_file(&b->dev, b->legacy_io);
928 /* Allocated above after the legacy_io struct */
929 b->legacy_mem = b->legacy_io + 1;
930 sysfs_bin_attr_init(b->legacy_mem);
931 b->legacy_mem->attr.name = "legacy_mem";
932 b->legacy_mem->size = 1024*1024;
933 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
934 b->legacy_mem->mmap = pci_mmap_legacy_mem;
935 pci_adjust_legacy_attr(b, pci_mmap_mem);
936 error = device_create_bin_file(&b->dev, b->legacy_mem);
943 device_remove_bin_file(&b->dev, b->legacy_io);
948 printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
952 void pci_remove_legacy_files(struct pci_bus *b)
955 device_remove_bin_file(&b->dev, b->legacy_io);
956 device_remove_bin_file(&b->dev, b->legacy_mem);
957 kfree(b->legacy_io); /* both are allocated here */
960 #endif /* HAVE_PCI_LEGACY */
964 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
965 enum pci_mmap_api mmap_api)
967 unsigned long nr, start, size, pci_start;
969 if (pci_resource_len(pdev, resno) == 0)
972 start = vma->vm_pgoff;
973 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
974 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
975 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
976 if (start >= pci_start && start < pci_start + size &&
977 start + nr <= pci_start + size)
983 * pci_mmap_resource - map a PCI resource into user memory space
984 * @kobj: kobject for mapping
985 * @attr: struct bin_attribute for the file being mapped
986 * @vma: struct vm_area_struct passed into the mmap
987 * @write_combine: 1 for write_combine mapping
989 * Use the regular PCI mapping routines to map a PCI resource into userspace.
991 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
992 struct vm_area_struct *vma, int write_combine)
994 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
995 struct device, kobj));
996 struct resource *res = attr->private;
997 enum pci_mmap_state mmap_type;
998 resource_size_t start, end;
1001 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1002 if (res == &pdev->resource[i])
1004 if (i >= PCI_ROM_RESOURCE)
1007 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
1008 WARN(1, "process \"%s\" tried to map 0x%08lx bytes at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
1009 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
1011 (u64)pci_resource_start(pdev, i),
1012 (u64)pci_resource_len(pdev, i));
1016 /* pci_mmap_page_range() expects the same kind of entry as coming
1017 * from /proc/bus/pci/ which is a "user visible" value. If this is
1018 * different from the resource itself, arch will do necessary fixup.
1020 pci_resource_to_user(pdev, i, res, &start, &end);
1021 vma->vm_pgoff += start >> PAGE_SHIFT;
1022 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1024 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
1027 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1030 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1031 struct bin_attribute *attr,
1032 struct vm_area_struct *vma)
1034 return pci_mmap_resource(kobj, attr, vma, 0);
1037 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1038 struct bin_attribute *attr,
1039 struct vm_area_struct *vma)
1041 return pci_mmap_resource(kobj, attr, vma, 1);
1044 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1045 struct bin_attribute *attr, char *buf,
1046 loff_t off, size_t count, bool write)
1048 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1049 struct device, kobj));
1050 struct resource *res = attr->private;
1051 unsigned long port = off;
1054 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1055 if (res == &pdev->resource[i])
1057 if (i >= PCI_ROM_RESOURCE)
1060 port += pci_resource_start(pdev, i);
1062 if (port > pci_resource_end(pdev, i))
1065 if (port + count - 1 > pci_resource_end(pdev, i))
1071 outb(*(u8 *)buf, port);
1073 *(u8 *)buf = inb(port);
1077 outw(*(u16 *)buf, port);
1079 *(u16 *)buf = inw(port);
1083 outl(*(u32 *)buf, port);
1085 *(u32 *)buf = inl(port);
1091 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1092 struct bin_attribute *attr, char *buf,
1093 loff_t off, size_t count)
1095 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1098 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1099 struct bin_attribute *attr, char *buf,
1100 loff_t off, size_t count)
1102 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1106 * pci_remove_resource_files - cleanup resource files
1107 * @pdev: dev to cleanup
1109 * If we created resource files for @pdev, remove them from sysfs and
1110 * free their resources.
1112 static void pci_remove_resource_files(struct pci_dev *pdev)
1116 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1117 struct bin_attribute *res_attr;
1119 res_attr = pdev->res_attr[i];
1121 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1125 res_attr = pdev->res_attr_wc[i];
1127 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1133 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1135 /* allocate attribute structure, piggyback attribute name */
1136 int name_len = write_combine ? 13 : 10;
1137 struct bin_attribute *res_attr;
1140 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1142 char *res_attr_name = (char *)(res_attr + 1);
1144 sysfs_bin_attr_init(res_attr);
1145 if (write_combine) {
1146 pdev->res_attr_wc[num] = res_attr;
1147 sprintf(res_attr_name, "resource%d_wc", num);
1148 res_attr->mmap = pci_mmap_resource_wc;
1150 pdev->res_attr[num] = res_attr;
1151 sprintf(res_attr_name, "resource%d", num);
1152 res_attr->mmap = pci_mmap_resource_uc;
1154 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1155 res_attr->read = pci_read_resource_io;
1156 res_attr->write = pci_write_resource_io;
1158 res_attr->attr.name = res_attr_name;
1159 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1160 res_attr->size = pci_resource_len(pdev, num);
1161 res_attr->private = &pdev->resource[num];
1162 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1170 * pci_create_resource_files - create resource files in sysfs for @dev
1171 * @pdev: dev in question
1173 * Walk the resources in @pdev creating files for each resource available.
1175 static int pci_create_resource_files(struct pci_dev *pdev)
1180 /* Expose the PCI resources from this device as files */
1181 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1183 /* skip empty resources */
1184 if (!pci_resource_len(pdev, i))
1187 retval = pci_create_attr(pdev, i, 0);
1188 /* for prefetchable resources, create a WC mappable file */
1189 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1190 retval = pci_create_attr(pdev, i, 1);
1193 pci_remove_resource_files(pdev);
1199 #else /* !HAVE_PCI_MMAP */
1200 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1201 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1202 #endif /* HAVE_PCI_MMAP */
1205 * pci_write_rom - used to enable access to the PCI ROM display
1207 * @kobj: kernel object handle
1208 * @bin_attr: struct bin_attribute for this file
1211 * @count: number of byte in input
1213 * writing anything except 0 enables it
1215 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1216 struct bin_attribute *bin_attr, char *buf,
1217 loff_t off, size_t count)
1219 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1221 if ((off == 0) && (*buf == '0') && (count == 2))
1222 pdev->rom_attr_enabled = 0;
1224 pdev->rom_attr_enabled = 1;
1230 * pci_read_rom - read a PCI ROM
1232 * @kobj: kernel object handle
1233 * @bin_attr: struct bin_attribute for this file
1234 * @buf: where to put the data we read from the ROM
1236 * @count: number of bytes to read
1238 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1239 * device corresponding to @kobj.
1241 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1242 struct bin_attribute *bin_attr, char *buf,
1243 loff_t off, size_t count)
1245 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1249 if (!pdev->rom_attr_enabled)
1252 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1259 if (off + count > size)
1262 memcpy_fromio(buf, rom + off, count);
1264 pci_unmap_rom(pdev, rom);
1269 static struct bin_attribute pci_config_attr = {
1272 .mode = S_IRUGO | S_IWUSR,
1274 .size = PCI_CFG_SPACE_SIZE,
1275 .read = pci_read_config,
1276 .write = pci_write_config,
1279 static struct bin_attribute pcie_config_attr = {
1282 .mode = S_IRUGO | S_IWUSR,
1284 .size = PCI_CFG_SPACE_EXP_SIZE,
1285 .read = pci_read_config,
1286 .write = pci_write_config,
1289 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1290 const char *buf, size_t count)
1292 struct pci_dev *pdev = to_pci_dev(dev);
1294 ssize_t result = kstrtoul(buf, 0, &val);
1302 result = pci_reset_function(pdev);
1309 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1311 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1314 struct bin_attribute *attr;
1316 /* If the device has VPD, try to expose it in sysfs. */
1318 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1322 sysfs_bin_attr_init(attr);
1323 attr->size = dev->vpd->len;
1324 attr->attr.name = "vpd";
1325 attr->attr.mode = S_IRUSR | S_IWUSR;
1326 attr->read = read_vpd_attr;
1327 attr->write = write_vpd_attr;
1328 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1333 dev->vpd->attr = attr;
1336 /* Active State Power Management */
1337 pcie_aspm_create_sysfs_dev_files(dev);
1339 if (!pci_probe_reset_function(dev)) {
1340 retval = device_create_file(&dev->dev, &reset_attr);
1348 pcie_aspm_remove_sysfs_dev_files(dev);
1349 if (dev->vpd && dev->vpd->attr) {
1350 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1351 kfree(dev->vpd->attr);
1357 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1361 struct bin_attribute *attr;
1363 if (!sysfs_initialized)
1366 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1367 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1369 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1373 retval = pci_create_resource_files(pdev);
1375 goto err_config_file;
1377 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1378 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1379 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1382 /* If the device has a ROM, try to expose it in sysfs. */
1384 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1387 goto err_resource_files;
1389 sysfs_bin_attr_init(attr);
1390 attr->size = rom_size;
1391 attr->attr.name = "rom";
1392 attr->attr.mode = S_IRUSR | S_IWUSR;
1393 attr->read = pci_read_rom;
1394 attr->write = pci_write_rom;
1395 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1398 goto err_resource_files;
1400 pdev->rom_attr = attr;
1403 /* add sysfs entries for various capabilities */
1404 retval = pci_create_capabilities_sysfs(pdev);
1408 pci_create_firmware_label_files(pdev);
1414 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1415 kfree(pdev->rom_attr);
1416 pdev->rom_attr = NULL;
1419 pci_remove_resource_files(pdev);
1421 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1422 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1424 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1429 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1431 if (dev->vpd && dev->vpd->attr) {
1432 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1433 kfree(dev->vpd->attr);
1436 pcie_aspm_remove_sysfs_dev_files(dev);
1437 if (dev->reset_fn) {
1438 device_remove_file(&dev->dev, &reset_attr);
1444 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1445 * @pdev: device whose entries we should free
1447 * Cleanup when @pdev is removed from sysfs.
1449 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1453 if (!sysfs_initialized)
1456 pci_remove_capabilities_sysfs(pdev);
1458 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1459 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1461 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1463 pci_remove_resource_files(pdev);
1465 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1466 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1467 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1470 if (rom_size && pdev->rom_attr) {
1471 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1472 kfree(pdev->rom_attr);
1475 pci_remove_firmware_label_files(pdev);
1479 static int __init pci_sysfs_init(void)
1481 struct pci_dev *pdev = NULL;
1484 sysfs_initialized = 1;
1485 for_each_pci_dev(pdev) {
1486 retval = pci_create_sysfs_dev_files(pdev);
1495 late_initcall(pci_sysfs_init);
1497 static struct attribute *pci_dev_dev_attrs[] = {
1502 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1503 struct attribute *a, int n)
1505 struct device *dev = container_of(kobj, struct device, kobj);
1506 struct pci_dev *pdev = to_pci_dev(dev);
1508 if (a == &vga_attr.attr)
1509 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1515 static struct attribute *pci_dev_hp_attrs[] = {
1516 &dev_remove_attr.attr,
1517 &dev_rescan_attr.attr,
1521 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1522 struct attribute *a, int n)
1524 struct device *dev = container_of(kobj, struct device, kobj);
1525 struct pci_dev *pdev = to_pci_dev(dev);
1527 if (pdev->is_virtfn)
1533 static struct attribute_group pci_dev_hp_attr_group = {
1534 .attrs = pci_dev_hp_attrs,
1535 .is_visible = pci_dev_hp_attrs_are_visible,
1538 #ifdef CONFIG_PCI_IOV
1539 static struct attribute *sriov_dev_attrs[] = {
1540 &sriov_totalvfs_attr.attr,
1541 &sriov_numvfs_attr.attr,
1545 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1546 struct attribute *a, int n)
1548 struct device *dev = container_of(kobj, struct device, kobj);
1550 if (!dev_is_pf(dev))
1556 static struct attribute_group sriov_dev_attr_group = {
1557 .attrs = sriov_dev_attrs,
1558 .is_visible = sriov_attrs_are_visible,
1560 #endif /* CONFIG_PCI_IOV */
1562 static struct attribute_group pci_dev_attr_group = {
1563 .attrs = pci_dev_dev_attrs,
1564 .is_visible = pci_dev_attrs_are_visible,
1567 static const struct attribute_group *pci_dev_attr_groups[] = {
1568 &pci_dev_attr_group,
1569 &pci_dev_hp_attr_group,
1570 #ifdef CONFIG_PCI_IOV
1571 &sriov_dev_attr_group,
1576 struct device_type pci_dev_type = {
1577 .groups = pci_dev_attr_groups,