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, 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 enable_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 enable_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(enable);
224 static ssize_t numa_node_store(struct device *dev,
225 struct device_attribute *attr, const char *buf,
228 struct pci_dev *pdev = to_pci_dev(dev);
231 if (!capable(CAP_SYS_ADMIN))
234 ret = kstrtoint(buf, 0, &node);
238 if (!node_online(node))
241 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
242 dev_alert(&pdev->dev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
245 dev->numa_node = node;
249 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
252 return sprintf(buf, "%d\n", dev->numa_node);
254 static DEVICE_ATTR_RW(numa_node);
257 static ssize_t dma_mask_bits_show(struct device *dev,
258 struct device_attribute *attr, char *buf)
260 struct pci_dev *pdev = to_pci_dev(dev);
262 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
264 static DEVICE_ATTR_RO(dma_mask_bits);
266 static ssize_t consistent_dma_mask_bits_show(struct device *dev,
267 struct device_attribute *attr,
270 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
272 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
274 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
277 struct pci_dev *pdev = to_pci_dev(dev);
278 struct pci_bus *subordinate = pdev->subordinate;
280 return sprintf(buf, "%u\n", subordinate ?
281 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
285 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
286 const char *buf, size_t count)
288 struct pci_dev *pdev = to_pci_dev(dev);
289 struct pci_bus *subordinate = pdev->subordinate;
292 if (kstrtoul(buf, 0, &val) < 0)
295 if (!capable(CAP_SYS_ADMIN))
299 * "no_msi" and "bus_flags" only affect what happens when a driver
300 * requests MSI or MSI-X. They don't affect any drivers that have
301 * already requested MSI or MSI-X.
305 dev_info(&pdev->dev, "MSI/MSI-X %s for future drivers\n",
306 val ? "allowed" : "disallowed");
311 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
313 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
315 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
316 val ? "allowed" : "disallowed");
319 static DEVICE_ATTR_RW(msi_bus);
321 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
325 struct pci_bus *b = NULL;
327 if (kstrtoul(buf, 0, &val) < 0)
331 pci_lock_rescan_remove();
332 while ((b = pci_find_next_bus(b)) != NULL)
334 pci_unlock_rescan_remove();
338 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
340 static struct attribute *pci_bus_attrs[] = {
341 &bus_attr_rescan.attr,
345 static const struct attribute_group pci_bus_group = {
346 .attrs = pci_bus_attrs,
349 const struct attribute_group *pci_bus_groups[] = {
354 static ssize_t dev_rescan_store(struct device *dev,
355 struct device_attribute *attr, const char *buf,
359 struct pci_dev *pdev = to_pci_dev(dev);
361 if (kstrtoul(buf, 0, &val) < 0)
365 pci_lock_rescan_remove();
366 pci_rescan_bus(pdev->bus);
367 pci_unlock_rescan_remove();
371 static struct device_attribute dev_rescan_attr = __ATTR(rescan,
373 NULL, dev_rescan_store);
375 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
376 const char *buf, size_t count)
380 if (kstrtoul(buf, 0, &val) < 0)
383 if (val && device_remove_file_self(dev, attr))
384 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
387 static struct device_attribute dev_remove_attr = __ATTR(remove,
391 static ssize_t dev_bus_rescan_store(struct device *dev,
392 struct device_attribute *attr,
393 const char *buf, size_t count)
396 struct pci_bus *bus = to_pci_bus(dev);
398 if (kstrtoul(buf, 0, &val) < 0)
402 pci_lock_rescan_remove();
403 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
404 pci_rescan_bus_bridge_resize(bus->self);
407 pci_unlock_rescan_remove();
411 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
413 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
414 static ssize_t d3cold_allowed_store(struct device *dev,
415 struct device_attribute *attr,
416 const char *buf, size_t count)
418 struct pci_dev *pdev = to_pci_dev(dev);
421 if (kstrtoul(buf, 0, &val) < 0)
424 pdev->d3cold_allowed = !!val;
425 pm_runtime_resume(dev);
430 static ssize_t d3cold_allowed_show(struct device *dev,
431 struct device_attribute *attr, char *buf)
433 struct pci_dev *pdev = to_pci_dev(dev);
434 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
436 static DEVICE_ATTR_RW(d3cold_allowed);
440 static ssize_t devspec_show(struct device *dev,
441 struct device_attribute *attr, char *buf)
443 struct pci_dev *pdev = to_pci_dev(dev);
444 struct device_node *np = pci_device_to_OF_node(pdev);
446 if (np == NULL || np->full_name == NULL)
448 return sprintf(buf, "%s", np->full_name);
450 static DEVICE_ATTR_RO(devspec);
453 #ifdef CONFIG_PCI_IOV
454 static ssize_t sriov_totalvfs_show(struct device *dev,
455 struct device_attribute *attr,
458 struct pci_dev *pdev = to_pci_dev(dev);
460 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
464 static ssize_t sriov_numvfs_show(struct device *dev,
465 struct device_attribute *attr,
468 struct pci_dev *pdev = to_pci_dev(dev);
470 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
474 * num_vfs > 0; number of VFs to enable
475 * num_vfs = 0; disable all VFs
477 * Note: SRIOV spec doesn't allow partial VF
478 * disable, so it's all or none.
480 static ssize_t sriov_numvfs_store(struct device *dev,
481 struct device_attribute *attr,
482 const char *buf, size_t count)
484 struct pci_dev *pdev = to_pci_dev(dev);
488 ret = kstrtou16(buf, 0, &num_vfs);
492 if (num_vfs > pci_sriov_get_totalvfs(pdev))
495 if (num_vfs == pdev->sriov->num_VFs)
496 return count; /* no change */
498 /* is PF driver loaded w/callback */
499 if (!pdev->driver || !pdev->driver->sriov_configure) {
500 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
506 ret = pdev->driver->sriov_configure(pdev, 0);
513 if (pdev->sriov->num_VFs) {
514 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
515 pdev->sriov->num_VFs, num_vfs);
519 ret = pdev->driver->sriov_configure(pdev, num_vfs);
524 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
530 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
531 static struct device_attribute sriov_numvfs_attr =
532 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
533 sriov_numvfs_show, sriov_numvfs_store);
534 #endif /* CONFIG_PCI_IOV */
536 static ssize_t driver_override_store(struct device *dev,
537 struct device_attribute *attr,
538 const char *buf, size_t count)
540 struct pci_dev *pdev = to_pci_dev(dev);
541 char *driver_override, *old = pdev->driver_override, *cp;
543 if (count > PATH_MAX)
546 driver_override = kstrndup(buf, count, GFP_KERNEL);
547 if (!driver_override)
550 cp = strchr(driver_override, '\n');
554 if (strlen(driver_override)) {
555 pdev->driver_override = driver_override;
557 kfree(driver_override);
558 pdev->driver_override = NULL;
566 static ssize_t driver_override_show(struct device *dev,
567 struct device_attribute *attr, char *buf)
569 struct pci_dev *pdev = to_pci_dev(dev);
571 return sprintf(buf, "%s\n", pdev->driver_override);
573 static DEVICE_ATTR_RW(driver_override);
575 static struct attribute *pci_dev_attrs[] = {
576 &dev_attr_resource.attr,
577 &dev_attr_vendor.attr,
578 &dev_attr_device.attr,
579 &dev_attr_subsystem_vendor.attr,
580 &dev_attr_subsystem_device.attr,
581 &dev_attr_class.attr,
583 &dev_attr_local_cpus.attr,
584 &dev_attr_local_cpulist.attr,
585 &dev_attr_modalias.attr,
587 &dev_attr_numa_node.attr,
589 &dev_attr_dma_mask_bits.attr,
590 &dev_attr_consistent_dma_mask_bits.attr,
591 &dev_attr_enable.attr,
592 &dev_attr_broken_parity_status.attr,
593 &dev_attr_msi_bus.attr,
594 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
595 &dev_attr_d3cold_allowed.attr,
598 &dev_attr_devspec.attr,
600 &dev_attr_driver_override.attr,
604 static const struct attribute_group pci_dev_group = {
605 .attrs = pci_dev_attrs,
608 const struct attribute_group *pci_dev_groups[] = {
613 static struct attribute *pcibus_attrs[] = {
614 &dev_attr_rescan.attr,
615 &dev_attr_cpuaffinity.attr,
616 &dev_attr_cpulistaffinity.attr,
620 static const struct attribute_group pcibus_group = {
621 .attrs = pcibus_attrs,
624 const struct attribute_group *pcibus_groups[] = {
629 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
632 struct pci_dev *pdev = to_pci_dev(dev);
633 struct pci_dev *vga_dev = vga_default_device();
636 return sprintf(buf, "%u\n", (pdev == vga_dev));
638 return sprintf(buf, "%u\n",
639 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
640 IORESOURCE_ROM_SHADOW));
642 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
644 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
645 struct bin_attribute *bin_attr, char *buf,
646 loff_t off, size_t count)
648 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device,
650 unsigned int size = 64;
651 loff_t init_off = off;
652 u8 *data = (u8 *) buf;
654 /* Several chips lock up trying to read undefined config space */
655 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0)
656 size = dev->cfg_size;
657 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
662 if (off + count > size) {
669 pci_config_pm_runtime_get(dev);
671 if ((off & 1) && size) {
673 pci_user_read_config_byte(dev, off, &val);
674 data[off - init_off] = val;
679 if ((off & 3) && size > 2) {
681 pci_user_read_config_word(dev, off, &val);
682 data[off - init_off] = val & 0xff;
683 data[off - init_off + 1] = (val >> 8) & 0xff;
690 pci_user_read_config_dword(dev, off, &val);
691 data[off - init_off] = val & 0xff;
692 data[off - init_off + 1] = (val >> 8) & 0xff;
693 data[off - init_off + 2] = (val >> 16) & 0xff;
694 data[off - init_off + 3] = (val >> 24) & 0xff;
701 pci_user_read_config_word(dev, off, &val);
702 data[off - init_off] = val & 0xff;
703 data[off - init_off + 1] = (val >> 8) & 0xff;
710 pci_user_read_config_byte(dev, off, &val);
711 data[off - init_off] = val;
716 pci_config_pm_runtime_put(dev);
721 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
722 struct bin_attribute *bin_attr, char *buf,
723 loff_t off, size_t count)
725 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device,
727 unsigned int size = count;
728 loff_t init_off = off;
729 u8 *data = (u8 *) buf;
731 if (off > dev->cfg_size)
733 if (off + count > dev->cfg_size) {
734 size = dev->cfg_size - off;
738 pci_config_pm_runtime_get(dev);
740 if ((off & 1) && size) {
741 pci_user_write_config_byte(dev, off, data[off - init_off]);
746 if ((off & 3) && size > 2) {
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 u32 val = data[off - init_off];
756 val |= (u32) data[off - init_off + 1] << 8;
757 val |= (u32) data[off - init_off + 2] << 16;
758 val |= (u32) data[off - init_off + 3] << 24;
759 pci_user_write_config_dword(dev, off, val);
765 u16 val = data[off - init_off];
766 val |= (u16) data[off - init_off + 1] << 8;
767 pci_user_write_config_word(dev, off, val);
773 pci_user_write_config_byte(dev, off, data[off - init_off]);
778 pci_config_pm_runtime_put(dev);
783 static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
784 struct bin_attribute *bin_attr, char *buf,
785 loff_t off, size_t count)
787 struct pci_dev *dev =
788 to_pci_dev(container_of(kobj, struct device, kobj));
790 if (off > bin_attr->size)
792 else if (count > bin_attr->size - off)
793 count = bin_attr->size - off;
795 return pci_read_vpd(dev, off, count, buf);
798 static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
799 struct bin_attribute *bin_attr, char *buf,
800 loff_t off, size_t count)
802 struct pci_dev *dev =
803 to_pci_dev(container_of(kobj, struct device, kobj));
805 if (off > bin_attr->size)
807 else if (count > bin_attr->size - off)
808 count = bin_attr->size - off;
810 return pci_write_vpd(dev, off, count, buf);
813 #ifdef HAVE_PCI_LEGACY
815 * pci_read_legacy_io - read byte(s) from legacy I/O port space
816 * @filp: open sysfs file
817 * @kobj: kobject corresponding to file to read from
818 * @bin_attr: struct bin_attribute for this file
819 * @buf: buffer to store results
820 * @off: offset into legacy I/O port space
821 * @count: number of bytes to read
823 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
824 * callback routine (pci_legacy_read).
826 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
827 struct bin_attribute *bin_attr, char *buf,
828 loff_t off, size_t count)
830 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
833 /* Only support 1, 2 or 4 byte accesses */
834 if (count != 1 && count != 2 && count != 4)
837 return pci_legacy_read(bus, off, (u32 *)buf, count);
841 * pci_write_legacy_io - write byte(s) to legacy I/O port space
842 * @filp: open sysfs file
843 * @kobj: kobject corresponding to file to read from
844 * @bin_attr: struct bin_attribute for this file
845 * @buf: buffer containing value to be written
846 * @off: offset into legacy I/O port space
847 * @count: number of bytes to write
849 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
850 * callback routine (pci_legacy_write).
852 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
853 struct bin_attribute *bin_attr, char *buf,
854 loff_t off, size_t count)
856 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
859 /* Only support 1, 2 or 4 byte accesses */
860 if (count != 1 && count != 2 && count != 4)
863 return pci_legacy_write(bus, off, *(u32 *)buf, count);
867 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
868 * @filp: open sysfs file
869 * @kobj: kobject corresponding to device to be mapped
870 * @attr: struct bin_attribute for this file
871 * @vma: struct vm_area_struct passed to mmap
873 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
874 * legacy memory space (first meg of bus space) into application virtual
877 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
878 struct bin_attribute *attr,
879 struct vm_area_struct *vma)
881 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
884 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
888 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
889 * @filp: open sysfs file
890 * @kobj: kobject corresponding to device to be mapped
891 * @attr: struct bin_attribute for this file
892 * @vma: struct vm_area_struct passed to mmap
894 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
895 * legacy IO space (first meg of bus space) into application virtual
896 * memory space. Returns -ENOSYS if the operation isn't supported
898 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
899 struct bin_attribute *attr,
900 struct vm_area_struct *vma)
902 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
905 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
909 * pci_adjust_legacy_attr - adjustment of legacy file attributes
910 * @b: bus to create files under
911 * @mmap_type: I/O port or memory
913 * Stub implementation. Can be overridden by arch if necessary.
915 void __weak pci_adjust_legacy_attr(struct pci_bus *b,
916 enum pci_mmap_state mmap_type)
921 * pci_create_legacy_files - create legacy I/O port and memory files
922 * @b: bus to create files under
924 * Some platforms allow access to legacy I/O port and ISA memory space on
925 * a per-bus basis. This routine creates the files and ties them into
926 * their associated read, write and mmap files from pci-sysfs.c
928 * On error unwind, but don't propagate the error to the caller
929 * as it is ok to set up the PCI bus without these files.
931 void pci_create_legacy_files(struct pci_bus *b)
935 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
940 sysfs_bin_attr_init(b->legacy_io);
941 b->legacy_io->attr.name = "legacy_io";
942 b->legacy_io->size = 0xffff;
943 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
944 b->legacy_io->read = pci_read_legacy_io;
945 b->legacy_io->write = pci_write_legacy_io;
946 b->legacy_io->mmap = pci_mmap_legacy_io;
947 pci_adjust_legacy_attr(b, pci_mmap_io);
948 error = device_create_bin_file(&b->dev, b->legacy_io);
952 /* Allocated above after the legacy_io struct */
953 b->legacy_mem = b->legacy_io + 1;
954 sysfs_bin_attr_init(b->legacy_mem);
955 b->legacy_mem->attr.name = "legacy_mem";
956 b->legacy_mem->size = 1024*1024;
957 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
958 b->legacy_mem->mmap = pci_mmap_legacy_mem;
959 pci_adjust_legacy_attr(b, pci_mmap_mem);
960 error = device_create_bin_file(&b->dev, b->legacy_mem);
967 device_remove_bin_file(&b->dev, b->legacy_io);
972 printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
976 void pci_remove_legacy_files(struct pci_bus *b)
979 device_remove_bin_file(&b->dev, b->legacy_io);
980 device_remove_bin_file(&b->dev, b->legacy_mem);
981 kfree(b->legacy_io); /* both are allocated here */
984 #endif /* HAVE_PCI_LEGACY */
988 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
989 enum pci_mmap_api mmap_api)
991 unsigned long nr, start, size, pci_start;
993 if (pci_resource_len(pdev, resno) == 0)
996 start = vma->vm_pgoff;
997 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
998 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
999 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
1000 if (start >= pci_start && start < pci_start + size &&
1001 start + nr <= pci_start + size)
1007 * pci_mmap_resource - map a PCI resource into user memory space
1008 * @kobj: kobject for mapping
1009 * @attr: struct bin_attribute for the file being mapped
1010 * @vma: struct vm_area_struct passed into the mmap
1011 * @write_combine: 1 for write_combine mapping
1013 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1015 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1016 struct vm_area_struct *vma, int write_combine)
1018 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1019 struct device, kobj));
1020 struct resource *res = attr->private;
1021 enum pci_mmap_state mmap_type;
1022 resource_size_t start, end;
1025 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1026 if (res == &pdev->resource[i])
1028 if (i >= PCI_ROM_RESOURCE)
1031 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
1032 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",
1033 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
1035 (u64)pci_resource_start(pdev, i),
1036 (u64)pci_resource_len(pdev, i));
1040 /* pci_mmap_page_range() expects the same kind of entry as coming
1041 * from /proc/bus/pci/ which is a "user visible" value. If this is
1042 * different from the resource itself, arch will do necessary fixup.
1044 pci_resource_to_user(pdev, i, res, &start, &end);
1045 vma->vm_pgoff += start >> PAGE_SHIFT;
1046 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1048 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
1051 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1054 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1055 struct bin_attribute *attr,
1056 struct vm_area_struct *vma)
1058 return pci_mmap_resource(kobj, attr, vma, 0);
1061 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1062 struct bin_attribute *attr,
1063 struct vm_area_struct *vma)
1065 return pci_mmap_resource(kobj, attr, vma, 1);
1068 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1069 struct bin_attribute *attr, char *buf,
1070 loff_t off, size_t count, bool write)
1072 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1073 struct device, kobj));
1074 struct resource *res = attr->private;
1075 unsigned long port = off;
1078 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1079 if (res == &pdev->resource[i])
1081 if (i >= PCI_ROM_RESOURCE)
1084 port += pci_resource_start(pdev, i);
1086 if (port > pci_resource_end(pdev, i))
1089 if (port + count - 1 > pci_resource_end(pdev, i))
1095 outb(*(u8 *)buf, port);
1097 *(u8 *)buf = inb(port);
1101 outw(*(u16 *)buf, port);
1103 *(u16 *)buf = inw(port);
1107 outl(*(u32 *)buf, port);
1109 *(u32 *)buf = inl(port);
1115 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1116 struct bin_attribute *attr, char *buf,
1117 loff_t off, size_t count)
1119 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1122 static ssize_t 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.
1136 static void pci_remove_resource_files(struct pci_dev *pdev)
1140 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1141 struct bin_attribute *res_attr;
1143 res_attr = pdev->res_attr[i];
1145 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1149 res_attr = pdev->res_attr_wc[i];
1151 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1157 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1159 /* allocate attribute structure, piggyback attribute name */
1160 int name_len = write_combine ? 13 : 10;
1161 struct bin_attribute *res_attr;
1164 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1166 char *res_attr_name = (char *)(res_attr + 1);
1168 sysfs_bin_attr_init(res_attr);
1169 if (write_combine) {
1170 pdev->res_attr_wc[num] = res_attr;
1171 sprintf(res_attr_name, "resource%d_wc", num);
1172 res_attr->mmap = pci_mmap_resource_wc;
1174 pdev->res_attr[num] = res_attr;
1175 sprintf(res_attr_name, "resource%d", num);
1176 res_attr->mmap = pci_mmap_resource_uc;
1178 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1179 res_attr->read = pci_read_resource_io;
1180 res_attr->write = pci_write_resource_io;
1182 res_attr->attr.name = res_attr_name;
1183 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1184 res_attr->size = pci_resource_len(pdev, num);
1185 res_attr->private = &pdev->resource[num];
1186 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1194 * pci_create_resource_files - create resource files in sysfs for @dev
1195 * @pdev: dev in question
1197 * Walk the resources in @pdev creating files for each resource available.
1199 static int pci_create_resource_files(struct pci_dev *pdev)
1204 /* Expose the PCI resources from this device as files */
1205 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1207 /* skip empty resources */
1208 if (!pci_resource_len(pdev, i))
1211 retval = pci_create_attr(pdev, i, 0);
1212 /* for prefetchable resources, create a WC mappable file */
1213 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1214 retval = pci_create_attr(pdev, i, 1);
1217 pci_remove_resource_files(pdev);
1223 #else /* !HAVE_PCI_MMAP */
1224 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1225 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1226 #endif /* HAVE_PCI_MMAP */
1229 * pci_write_rom - used to enable access to the PCI ROM display
1231 * @kobj: kernel object handle
1232 * @bin_attr: struct bin_attribute for this file
1235 * @count: number of byte in input
1237 * writing anything except 0 enables it
1239 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1240 struct bin_attribute *bin_attr, char *buf,
1241 loff_t off, size_t count)
1243 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1245 if ((off == 0) && (*buf == '0') && (count == 2))
1246 pdev->rom_attr_enabled = 0;
1248 pdev->rom_attr_enabled = 1;
1254 * pci_read_rom - read a PCI ROM
1256 * @kobj: kernel object handle
1257 * @bin_attr: struct bin_attribute for this file
1258 * @buf: where to put the data we read from the ROM
1260 * @count: number of bytes to read
1262 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1263 * device corresponding to @kobj.
1265 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1266 struct bin_attribute *bin_attr, char *buf,
1267 loff_t off, size_t count)
1269 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1273 if (!pdev->rom_attr_enabled)
1276 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1283 if (off + count > size)
1286 memcpy_fromio(buf, rom + off, count);
1288 pci_unmap_rom(pdev, rom);
1293 static struct bin_attribute pci_config_attr = {
1296 .mode = S_IRUGO | S_IWUSR,
1298 .size = PCI_CFG_SPACE_SIZE,
1299 .read = pci_read_config,
1300 .write = pci_write_config,
1303 static struct bin_attribute pcie_config_attr = {
1306 .mode = S_IRUGO | S_IWUSR,
1308 .size = PCI_CFG_SPACE_EXP_SIZE,
1309 .read = pci_read_config,
1310 .write = pci_write_config,
1313 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1314 const char *buf, size_t count)
1316 struct pci_dev *pdev = to_pci_dev(dev);
1318 ssize_t result = kstrtoul(buf, 0, &val);
1326 result = pci_reset_function(pdev);
1333 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1335 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1338 struct bin_attribute *attr;
1340 /* If the device has VPD, try to expose it in sysfs. */
1342 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1346 sysfs_bin_attr_init(attr);
1347 attr->size = dev->vpd->len;
1348 attr->attr.name = "vpd";
1349 attr->attr.mode = S_IRUSR | S_IWUSR;
1350 attr->read = read_vpd_attr;
1351 attr->write = write_vpd_attr;
1352 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1357 dev->vpd->attr = attr;
1360 /* Active State Power Management */
1361 pcie_aspm_create_sysfs_dev_files(dev);
1363 if (!pci_probe_reset_function(dev)) {
1364 retval = device_create_file(&dev->dev, &reset_attr);
1372 pcie_aspm_remove_sysfs_dev_files(dev);
1373 if (dev->vpd && dev->vpd->attr) {
1374 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1375 kfree(dev->vpd->attr);
1381 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1385 struct bin_attribute *attr;
1387 if (!sysfs_initialized)
1390 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1391 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1393 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1397 retval = pci_create_resource_files(pdev);
1399 goto err_config_file;
1401 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1402 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1403 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1406 /* If the device has a ROM, try to expose it in sysfs. */
1408 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1411 goto err_resource_files;
1413 sysfs_bin_attr_init(attr);
1414 attr->size = rom_size;
1415 attr->attr.name = "rom";
1416 attr->attr.mode = S_IRUSR | S_IWUSR;
1417 attr->read = pci_read_rom;
1418 attr->write = pci_write_rom;
1419 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1422 goto err_resource_files;
1424 pdev->rom_attr = attr;
1427 /* add sysfs entries for various capabilities */
1428 retval = pci_create_capabilities_sysfs(pdev);
1432 pci_create_firmware_label_files(pdev);
1438 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1439 kfree(pdev->rom_attr);
1440 pdev->rom_attr = NULL;
1443 pci_remove_resource_files(pdev);
1445 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1446 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1448 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1453 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1455 if (dev->vpd && dev->vpd->attr) {
1456 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1457 kfree(dev->vpd->attr);
1460 pcie_aspm_remove_sysfs_dev_files(dev);
1461 if (dev->reset_fn) {
1462 device_remove_file(&dev->dev, &reset_attr);
1468 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1469 * @pdev: device whose entries we should free
1471 * Cleanup when @pdev is removed from sysfs.
1473 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1477 if (!sysfs_initialized)
1480 pci_remove_capabilities_sysfs(pdev);
1482 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1483 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1485 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1487 pci_remove_resource_files(pdev);
1489 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1490 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1491 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1494 if (rom_size && pdev->rom_attr) {
1495 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1496 kfree(pdev->rom_attr);
1499 pci_remove_firmware_label_files(pdev);
1503 static int __init pci_sysfs_init(void)
1505 struct pci_dev *pdev = NULL;
1508 sysfs_initialized = 1;
1509 for_each_pci_dev(pdev) {
1510 retval = pci_create_sysfs_dev_files(pdev);
1519 late_initcall(pci_sysfs_init);
1521 static struct attribute *pci_dev_dev_attrs[] = {
1526 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1527 struct attribute *a, int n)
1529 struct device *dev = container_of(kobj, struct device, kobj);
1530 struct pci_dev *pdev = to_pci_dev(dev);
1532 if (a == &vga_attr.attr)
1533 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1539 static struct attribute *pci_dev_hp_attrs[] = {
1540 &dev_remove_attr.attr,
1541 &dev_rescan_attr.attr,
1545 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1546 struct attribute *a, int n)
1548 struct device *dev = container_of(kobj, struct device, kobj);
1549 struct pci_dev *pdev = to_pci_dev(dev);
1551 if (pdev->is_virtfn)
1557 static struct attribute_group pci_dev_hp_attr_group = {
1558 .attrs = pci_dev_hp_attrs,
1559 .is_visible = pci_dev_hp_attrs_are_visible,
1562 #ifdef CONFIG_PCI_IOV
1563 static struct attribute *sriov_dev_attrs[] = {
1564 &sriov_totalvfs_attr.attr,
1565 &sriov_numvfs_attr.attr,
1569 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1570 struct attribute *a, int n)
1572 struct device *dev = container_of(kobj, struct device, kobj);
1574 if (!dev_is_pf(dev))
1580 static struct attribute_group sriov_dev_attr_group = {
1581 .attrs = sriov_dev_attrs,
1582 .is_visible = sriov_attrs_are_visible,
1584 #endif /* CONFIG_PCI_IOV */
1586 static struct attribute_group pci_dev_attr_group = {
1587 .attrs = pci_dev_dev_attrs,
1588 .is_visible = pci_dev_attrs_are_visible,
1591 static const struct attribute_group *pci_dev_attr_groups[] = {
1592 &pci_dev_attr_group,
1593 &pci_dev_hp_attr_group,
1594 #ifdef CONFIG_PCI_IOV
1595 &sriov_dev_attr_group,
1600 struct device_type pci_dev_type = {
1601 .groups = pci_dev_attr_groups,