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, bool list,
81 struct device_attribute *attr, char *buf)
83 const struct cpumask *mask;
86 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
87 cpumask_of_node(dev_to_node(dev));
89 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
91 return cpumap_print_to_pagebuf(list, buf, mask);
94 static ssize_t local_cpus_show(struct device *dev,
95 struct device_attribute *attr, char *buf)
97 return pci_dev_show_local_cpu(dev, false, attr, buf);
99 static DEVICE_ATTR_RO(local_cpus);
101 static ssize_t local_cpulist_show(struct device *dev,
102 struct device_attribute *attr, char *buf)
104 return pci_dev_show_local_cpu(dev, true, attr, buf);
106 static DEVICE_ATTR_RO(local_cpulist);
109 * PCI Bus Class Devices
111 static ssize_t cpuaffinity_show(struct device *dev,
112 struct device_attribute *attr, char *buf)
114 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
116 return cpumap_print_to_pagebuf(false, buf, cpumask);
118 static DEVICE_ATTR_RO(cpuaffinity);
120 static ssize_t cpulistaffinity_show(struct device *dev,
121 struct device_attribute *attr, char *buf)
123 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
125 return cpumap_print_to_pagebuf(true, buf, cpumask);
127 static DEVICE_ATTR_RO(cpulistaffinity);
130 static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
133 struct pci_dev *pci_dev = to_pci_dev(dev);
137 resource_size_t start, end;
139 if (pci_dev->subordinate)
140 max = DEVICE_COUNT_RESOURCE;
142 max = PCI_BRIDGE_RESOURCES;
144 for (i = 0; i < max; i++) {
145 struct resource *res = &pci_dev->resource[i];
146 pci_resource_to_user(pci_dev, i, res, &start, &end);
147 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
148 (unsigned long long)start,
149 (unsigned long long)end,
150 (unsigned long long)res->flags);
154 static DEVICE_ATTR_RO(resource);
156 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
159 struct pci_dev *pci_dev = to_pci_dev(dev);
161 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
162 pci_dev->vendor, pci_dev->device,
163 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
164 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
165 (u8)(pci_dev->class));
167 static DEVICE_ATTR_RO(modalias);
169 static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
170 const char *buf, size_t count)
172 struct pci_dev *pdev = to_pci_dev(dev);
174 ssize_t result = kstrtoul(buf, 0, &val);
179 /* this can crash the machine when done on the "wrong" device */
180 if (!capable(CAP_SYS_ADMIN))
184 if (pci_is_enabled(pdev))
185 pci_disable_device(pdev);
189 result = pci_enable_device(pdev);
191 return result < 0 ? result : count;
194 static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
197 struct pci_dev *pdev;
199 pdev = to_pci_dev(dev);
200 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
202 static DEVICE_ATTR_RW(enable);
205 static ssize_t numa_node_store(struct device *dev,
206 struct device_attribute *attr, const char *buf,
209 struct pci_dev *pdev = to_pci_dev(dev);
212 if (!capable(CAP_SYS_ADMIN))
215 ret = kstrtoint(buf, 0, &node);
219 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
222 if (node != NUMA_NO_NODE && !node_online(node))
225 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
226 dev_alert(&pdev->dev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
229 dev->numa_node = node;
233 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
236 return sprintf(buf, "%d\n", dev->numa_node);
238 static DEVICE_ATTR_RW(numa_node);
241 static ssize_t dma_mask_bits_show(struct device *dev,
242 struct device_attribute *attr, char *buf)
244 struct pci_dev *pdev = to_pci_dev(dev);
246 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
248 static DEVICE_ATTR_RO(dma_mask_bits);
250 static ssize_t consistent_dma_mask_bits_show(struct device *dev,
251 struct device_attribute *attr,
254 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
256 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
258 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
261 struct pci_dev *pdev = to_pci_dev(dev);
262 struct pci_bus *subordinate = pdev->subordinate;
264 return sprintf(buf, "%u\n", subordinate ?
265 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
269 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
270 const char *buf, size_t count)
272 struct pci_dev *pdev = to_pci_dev(dev);
273 struct pci_bus *subordinate = pdev->subordinate;
276 if (kstrtoul(buf, 0, &val) < 0)
279 if (!capable(CAP_SYS_ADMIN))
283 * "no_msi" and "bus_flags" only affect what happens when a driver
284 * requests MSI or MSI-X. They don't affect any drivers that have
285 * already requested MSI or MSI-X.
289 dev_info(&pdev->dev, "MSI/MSI-X %s for future drivers\n",
290 val ? "allowed" : "disallowed");
295 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
297 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
299 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
300 val ? "allowed" : "disallowed");
303 static DEVICE_ATTR_RW(msi_bus);
305 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
309 struct pci_bus *b = NULL;
311 if (kstrtoul(buf, 0, &val) < 0)
315 pci_lock_rescan_remove();
316 while ((b = pci_find_next_bus(b)) != NULL)
318 pci_unlock_rescan_remove();
322 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
324 static struct attribute *pci_bus_attrs[] = {
325 &bus_attr_rescan.attr,
329 static const struct attribute_group pci_bus_group = {
330 .attrs = pci_bus_attrs,
333 const struct attribute_group *pci_bus_groups[] = {
338 static ssize_t dev_rescan_store(struct device *dev,
339 struct device_attribute *attr, const char *buf,
343 struct pci_dev *pdev = to_pci_dev(dev);
345 if (kstrtoul(buf, 0, &val) < 0)
349 pci_lock_rescan_remove();
350 pci_rescan_bus(pdev->bus);
351 pci_unlock_rescan_remove();
355 static struct device_attribute dev_rescan_attr = __ATTR(rescan,
357 NULL, dev_rescan_store);
359 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
360 const char *buf, size_t count)
364 if (kstrtoul(buf, 0, &val) < 0)
367 if (val && device_remove_file_self(dev, attr))
368 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
371 static struct device_attribute dev_remove_attr = __ATTR(remove,
375 static ssize_t dev_bus_rescan_store(struct device *dev,
376 struct device_attribute *attr,
377 const char *buf, size_t count)
380 struct pci_bus *bus = to_pci_bus(dev);
382 if (kstrtoul(buf, 0, &val) < 0)
386 pci_lock_rescan_remove();
387 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
388 pci_rescan_bus_bridge_resize(bus->self);
391 pci_unlock_rescan_remove();
395 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
397 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
398 static ssize_t d3cold_allowed_store(struct device *dev,
399 struct device_attribute *attr,
400 const char *buf, size_t count)
402 struct pci_dev *pdev = to_pci_dev(dev);
405 if (kstrtoul(buf, 0, &val) < 0)
408 pdev->d3cold_allowed = !!val;
409 pm_runtime_resume(dev);
414 static ssize_t d3cold_allowed_show(struct device *dev,
415 struct device_attribute *attr, char *buf)
417 struct pci_dev *pdev = to_pci_dev(dev);
418 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
420 static DEVICE_ATTR_RW(d3cold_allowed);
424 static ssize_t devspec_show(struct device *dev,
425 struct device_attribute *attr, char *buf)
427 struct pci_dev *pdev = to_pci_dev(dev);
428 struct device_node *np = pci_device_to_OF_node(pdev);
430 if (np == NULL || np->full_name == NULL)
432 return sprintf(buf, "%s", np->full_name);
434 static DEVICE_ATTR_RO(devspec);
437 #ifdef CONFIG_PCI_IOV
438 static ssize_t sriov_totalvfs_show(struct device *dev,
439 struct device_attribute *attr,
442 struct pci_dev *pdev = to_pci_dev(dev);
444 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
448 static ssize_t sriov_numvfs_show(struct device *dev,
449 struct device_attribute *attr,
452 struct pci_dev *pdev = to_pci_dev(dev);
454 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
458 * num_vfs > 0; number of VFs to enable
459 * num_vfs = 0; disable all VFs
461 * Note: SRIOV spec doesn't allow partial VF
462 * disable, so it's all or none.
464 static ssize_t sriov_numvfs_store(struct device *dev,
465 struct device_attribute *attr,
466 const char *buf, size_t count)
468 struct pci_dev *pdev = to_pci_dev(dev);
472 ret = kstrtou16(buf, 0, &num_vfs);
476 if (num_vfs > pci_sriov_get_totalvfs(pdev))
479 if (num_vfs == pdev->sriov->num_VFs)
480 return count; /* no change */
482 /* is PF driver loaded w/callback */
483 if (!pdev->driver || !pdev->driver->sriov_configure) {
484 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
490 ret = pdev->driver->sriov_configure(pdev, 0);
497 if (pdev->sriov->num_VFs) {
498 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
499 pdev->sriov->num_VFs, num_vfs);
503 ret = pdev->driver->sriov_configure(pdev, num_vfs);
508 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
514 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
515 static struct device_attribute sriov_numvfs_attr =
516 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
517 sriov_numvfs_show, sriov_numvfs_store);
518 #endif /* CONFIG_PCI_IOV */
520 static ssize_t driver_override_store(struct device *dev,
521 struct device_attribute *attr,
522 const char *buf, size_t count)
524 struct pci_dev *pdev = to_pci_dev(dev);
525 char *driver_override, *old = pdev->driver_override, *cp;
527 /* We need to keep extra room for a newline */
528 if (count >= (PAGE_SIZE - 1))
531 driver_override = kstrndup(buf, count, GFP_KERNEL);
532 if (!driver_override)
535 cp = strchr(driver_override, '\n');
539 if (strlen(driver_override)) {
540 pdev->driver_override = driver_override;
542 kfree(driver_override);
543 pdev->driver_override = NULL;
551 static ssize_t driver_override_show(struct device *dev,
552 struct device_attribute *attr, char *buf)
554 struct pci_dev *pdev = to_pci_dev(dev);
556 return snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
558 static DEVICE_ATTR_RW(driver_override);
560 static struct attribute *pci_dev_attrs[] = {
561 &dev_attr_resource.attr,
562 &dev_attr_vendor.attr,
563 &dev_attr_device.attr,
564 &dev_attr_subsystem_vendor.attr,
565 &dev_attr_subsystem_device.attr,
566 &dev_attr_class.attr,
568 &dev_attr_local_cpus.attr,
569 &dev_attr_local_cpulist.attr,
570 &dev_attr_modalias.attr,
572 &dev_attr_numa_node.attr,
574 &dev_attr_dma_mask_bits.attr,
575 &dev_attr_consistent_dma_mask_bits.attr,
576 &dev_attr_enable.attr,
577 &dev_attr_broken_parity_status.attr,
578 &dev_attr_msi_bus.attr,
579 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
580 &dev_attr_d3cold_allowed.attr,
583 &dev_attr_devspec.attr,
585 &dev_attr_driver_override.attr,
589 static const struct attribute_group pci_dev_group = {
590 .attrs = pci_dev_attrs,
593 const struct attribute_group *pci_dev_groups[] = {
598 static struct attribute *pcibus_attrs[] = {
599 &dev_attr_rescan.attr,
600 &dev_attr_cpuaffinity.attr,
601 &dev_attr_cpulistaffinity.attr,
605 static const struct attribute_group pcibus_group = {
606 .attrs = pcibus_attrs,
609 const struct attribute_group *pcibus_groups[] = {
614 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
617 struct pci_dev *pdev = to_pci_dev(dev);
618 struct pci_dev *vga_dev = vga_default_device();
621 return sprintf(buf, "%u\n", (pdev == vga_dev));
623 return sprintf(buf, "%u\n",
624 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
625 IORESOURCE_ROM_SHADOW));
627 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
629 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
630 struct bin_attribute *bin_attr, char *buf,
631 loff_t off, size_t count)
633 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device,
635 unsigned int size = 64;
636 loff_t init_off = off;
637 u8 *data = (u8 *) buf;
639 /* Several chips lock up trying to read undefined config space */
640 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0)
641 size = dev->cfg_size;
642 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
647 if (off + count > size) {
654 pci_config_pm_runtime_get(dev);
656 if ((off & 1) && size) {
658 pci_user_read_config_byte(dev, off, &val);
659 data[off - init_off] = val;
664 if ((off & 3) && size > 2) {
666 pci_user_read_config_word(dev, off, &val);
667 data[off - init_off] = val & 0xff;
668 data[off - init_off + 1] = (val >> 8) & 0xff;
675 pci_user_read_config_dword(dev, off, &val);
676 data[off - init_off] = val & 0xff;
677 data[off - init_off + 1] = (val >> 8) & 0xff;
678 data[off - init_off + 2] = (val >> 16) & 0xff;
679 data[off - init_off + 3] = (val >> 24) & 0xff;
686 pci_user_read_config_word(dev, off, &val);
687 data[off - init_off] = val & 0xff;
688 data[off - init_off + 1] = (val >> 8) & 0xff;
695 pci_user_read_config_byte(dev, off, &val);
696 data[off - init_off] = val;
701 pci_config_pm_runtime_put(dev);
706 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
707 struct bin_attribute *bin_attr, char *buf,
708 loff_t off, size_t count)
710 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device,
712 unsigned int size = count;
713 loff_t init_off = off;
714 u8 *data = (u8 *) buf;
716 if (off > dev->cfg_size)
718 if (off + count > dev->cfg_size) {
719 size = dev->cfg_size - off;
723 pci_config_pm_runtime_get(dev);
725 if ((off & 1) && size) {
726 pci_user_write_config_byte(dev, off, data[off - init_off]);
731 if ((off & 3) && size > 2) {
732 u16 val = data[off - init_off];
733 val |= (u16) data[off - init_off + 1] << 8;
734 pci_user_write_config_word(dev, off, val);
740 u32 val = data[off - init_off];
741 val |= (u32) data[off - init_off + 1] << 8;
742 val |= (u32) data[off - init_off + 2] << 16;
743 val |= (u32) data[off - init_off + 3] << 24;
744 pci_user_write_config_dword(dev, off, val);
750 u16 val = data[off - init_off];
751 val |= (u16) data[off - init_off + 1] << 8;
752 pci_user_write_config_word(dev, off, val);
758 pci_user_write_config_byte(dev, off, data[off - init_off]);
763 pci_config_pm_runtime_put(dev);
768 static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
769 struct bin_attribute *bin_attr, char *buf,
770 loff_t off, size_t count)
772 struct pci_dev *dev =
773 to_pci_dev(container_of(kobj, struct device, kobj));
775 if (off > bin_attr->size)
777 else if (count > bin_attr->size - off)
778 count = bin_attr->size - off;
780 return pci_read_vpd(dev, off, count, buf);
783 static ssize_t write_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_write_vpd(dev, off, count, buf);
798 #ifdef HAVE_PCI_LEGACY
800 * pci_read_legacy_io - read byte(s) from legacy I/O port space
801 * @filp: open sysfs file
802 * @kobj: kobject corresponding to file to read from
803 * @bin_attr: struct bin_attribute for this file
804 * @buf: buffer to store results
805 * @off: offset into legacy I/O port space
806 * @count: number of bytes to read
808 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
809 * callback routine (pci_legacy_read).
811 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
812 struct bin_attribute *bin_attr, char *buf,
813 loff_t off, size_t count)
815 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
818 /* Only support 1, 2 or 4 byte accesses */
819 if (count != 1 && count != 2 && count != 4)
822 return pci_legacy_read(bus, off, (u32 *)buf, count);
826 * pci_write_legacy_io - write byte(s) to legacy I/O port space
827 * @filp: open sysfs file
828 * @kobj: kobject corresponding to file to read from
829 * @bin_attr: struct bin_attribute for this file
830 * @buf: buffer containing value to be written
831 * @off: offset into legacy I/O port space
832 * @count: number of bytes to write
834 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
835 * callback routine (pci_legacy_write).
837 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
838 struct bin_attribute *bin_attr, char *buf,
839 loff_t off, size_t count)
841 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
844 /* Only support 1, 2 or 4 byte accesses */
845 if (count != 1 && count != 2 && count != 4)
848 return pci_legacy_write(bus, off, *(u32 *)buf, count);
852 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
853 * @filp: open sysfs file
854 * @kobj: kobject corresponding to device to be mapped
855 * @attr: struct bin_attribute for this file
856 * @vma: struct vm_area_struct passed to mmap
858 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
859 * legacy memory space (first meg of bus space) into application virtual
862 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
863 struct bin_attribute *attr,
864 struct vm_area_struct *vma)
866 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
869 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
873 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
874 * @filp: open sysfs file
875 * @kobj: kobject corresponding to device to be mapped
876 * @attr: struct bin_attribute for this file
877 * @vma: struct vm_area_struct passed to mmap
879 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
880 * legacy IO space (first meg of bus space) into application virtual
881 * memory space. Returns -ENOSYS if the operation isn't supported
883 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
884 struct bin_attribute *attr,
885 struct vm_area_struct *vma)
887 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
890 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
894 * pci_adjust_legacy_attr - adjustment of legacy file attributes
895 * @b: bus to create files under
896 * @mmap_type: I/O port or memory
898 * Stub implementation. Can be overridden by arch if necessary.
900 void __weak pci_adjust_legacy_attr(struct pci_bus *b,
901 enum pci_mmap_state mmap_type)
906 * pci_create_legacy_files - create legacy I/O port and memory files
907 * @b: bus to create files under
909 * Some platforms allow access to legacy I/O port and ISA memory space on
910 * a per-bus basis. This routine creates the files and ties them into
911 * their associated read, write and mmap files from pci-sysfs.c
913 * On error unwind, but don't propagate the error to the caller
914 * as it is ok to set up the PCI bus without these files.
916 void pci_create_legacy_files(struct pci_bus *b)
920 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
925 sysfs_bin_attr_init(b->legacy_io);
926 b->legacy_io->attr.name = "legacy_io";
927 b->legacy_io->size = 0xffff;
928 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
929 b->legacy_io->read = pci_read_legacy_io;
930 b->legacy_io->write = pci_write_legacy_io;
931 b->legacy_io->mmap = pci_mmap_legacy_io;
932 pci_adjust_legacy_attr(b, pci_mmap_io);
933 error = device_create_bin_file(&b->dev, b->legacy_io);
937 /* Allocated above after the legacy_io struct */
938 b->legacy_mem = b->legacy_io + 1;
939 sysfs_bin_attr_init(b->legacy_mem);
940 b->legacy_mem->attr.name = "legacy_mem";
941 b->legacy_mem->size = 1024*1024;
942 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
943 b->legacy_mem->mmap = pci_mmap_legacy_mem;
944 pci_adjust_legacy_attr(b, pci_mmap_mem);
945 error = device_create_bin_file(&b->dev, b->legacy_mem);
952 device_remove_bin_file(&b->dev, b->legacy_io);
957 printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
961 void pci_remove_legacy_files(struct pci_bus *b)
964 device_remove_bin_file(&b->dev, b->legacy_io);
965 device_remove_bin_file(&b->dev, b->legacy_mem);
966 kfree(b->legacy_io); /* both are allocated here */
969 #endif /* HAVE_PCI_LEGACY */
973 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
974 enum pci_mmap_api mmap_api)
976 unsigned long nr, start, size, pci_start;
978 if (pci_resource_len(pdev, resno) == 0)
981 start = vma->vm_pgoff;
982 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
983 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
984 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
985 if (start >= pci_start && start < pci_start + size &&
986 start + nr <= pci_start + size)
992 * pci_mmap_resource - map a PCI resource into user memory space
993 * @kobj: kobject for mapping
994 * @attr: struct bin_attribute for the file being mapped
995 * @vma: struct vm_area_struct passed into the mmap
996 * @write_combine: 1 for write_combine mapping
998 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1000 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1001 struct vm_area_struct *vma, int write_combine)
1003 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1004 struct device, kobj));
1005 struct resource *res = attr->private;
1006 enum pci_mmap_state mmap_type;
1007 resource_size_t start, end;
1010 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1011 if (res == &pdev->resource[i])
1013 if (i >= PCI_ROM_RESOURCE)
1016 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
1017 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",
1018 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
1020 (u64)pci_resource_start(pdev, i),
1021 (u64)pci_resource_len(pdev, i));
1025 /* pci_mmap_page_range() expects the same kind of entry as coming
1026 * from /proc/bus/pci/ which is a "user visible" value. If this is
1027 * different from the resource itself, arch will do necessary fixup.
1029 pci_resource_to_user(pdev, i, res, &start, &end);
1030 vma->vm_pgoff += start >> PAGE_SHIFT;
1031 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1033 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
1036 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1039 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1040 struct bin_attribute *attr,
1041 struct vm_area_struct *vma)
1043 return pci_mmap_resource(kobj, attr, vma, 0);
1046 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1047 struct bin_attribute *attr,
1048 struct vm_area_struct *vma)
1050 return pci_mmap_resource(kobj, attr, vma, 1);
1053 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1054 struct bin_attribute *attr, char *buf,
1055 loff_t off, size_t count, bool write)
1057 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1058 struct device, kobj));
1059 struct resource *res = attr->private;
1060 unsigned long port = off;
1063 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1064 if (res == &pdev->resource[i])
1066 if (i >= PCI_ROM_RESOURCE)
1069 port += pci_resource_start(pdev, i);
1071 if (port > pci_resource_end(pdev, i))
1074 if (port + count - 1 > pci_resource_end(pdev, i))
1080 outb(*(u8 *)buf, port);
1082 *(u8 *)buf = inb(port);
1086 outw(*(u16 *)buf, port);
1088 *(u16 *)buf = inw(port);
1092 outl(*(u32 *)buf, port);
1094 *(u32 *)buf = inl(port);
1100 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1101 struct bin_attribute *attr, char *buf,
1102 loff_t off, size_t count)
1104 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1107 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1108 struct bin_attribute *attr, char *buf,
1109 loff_t off, size_t count)
1111 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1115 * pci_remove_resource_files - cleanup resource files
1116 * @pdev: dev to cleanup
1118 * If we created resource files for @pdev, remove them from sysfs and
1119 * free their resources.
1121 static void pci_remove_resource_files(struct pci_dev *pdev)
1125 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1126 struct bin_attribute *res_attr;
1128 res_attr = pdev->res_attr[i];
1130 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1134 res_attr = pdev->res_attr_wc[i];
1136 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1142 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1144 /* allocate attribute structure, piggyback attribute name */
1145 int name_len = write_combine ? 13 : 10;
1146 struct bin_attribute *res_attr;
1149 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1151 char *res_attr_name = (char *)(res_attr + 1);
1153 sysfs_bin_attr_init(res_attr);
1154 if (write_combine) {
1155 pdev->res_attr_wc[num] = res_attr;
1156 sprintf(res_attr_name, "resource%d_wc", num);
1157 res_attr->mmap = pci_mmap_resource_wc;
1159 pdev->res_attr[num] = res_attr;
1160 sprintf(res_attr_name, "resource%d", num);
1161 res_attr->mmap = pci_mmap_resource_uc;
1163 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1164 res_attr->read = pci_read_resource_io;
1165 res_attr->write = pci_write_resource_io;
1167 res_attr->attr.name = res_attr_name;
1168 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1169 res_attr->size = pci_resource_len(pdev, num);
1170 res_attr->private = &pdev->resource[num];
1171 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1179 * pci_create_resource_files - create resource files in sysfs for @dev
1180 * @pdev: dev in question
1182 * Walk the resources in @pdev creating files for each resource available.
1184 static int pci_create_resource_files(struct pci_dev *pdev)
1189 /* Expose the PCI resources from this device as files */
1190 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1192 /* skip empty resources */
1193 if (!pci_resource_len(pdev, i))
1196 retval = pci_create_attr(pdev, i, 0);
1197 /* for prefetchable resources, create a WC mappable file */
1198 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1199 retval = pci_create_attr(pdev, i, 1);
1202 pci_remove_resource_files(pdev);
1208 #else /* !HAVE_PCI_MMAP */
1209 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1210 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1211 #endif /* HAVE_PCI_MMAP */
1214 * pci_write_rom - used to enable access to the PCI ROM display
1216 * @kobj: kernel object handle
1217 * @bin_attr: struct bin_attribute for this file
1220 * @count: number of byte in input
1222 * writing anything except 0 enables it
1224 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1225 struct bin_attribute *bin_attr, char *buf,
1226 loff_t off, size_t count)
1228 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1230 if ((off == 0) && (*buf == '0') && (count == 2))
1231 pdev->rom_attr_enabled = 0;
1233 pdev->rom_attr_enabled = 1;
1239 * pci_read_rom - read a PCI ROM
1241 * @kobj: kernel object handle
1242 * @bin_attr: struct bin_attribute for this file
1243 * @buf: where to put the data we read from the ROM
1245 * @count: number of bytes to read
1247 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1248 * device corresponding to @kobj.
1250 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1251 struct bin_attribute *bin_attr, char *buf,
1252 loff_t off, size_t count)
1254 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1258 if (!pdev->rom_attr_enabled)
1261 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1268 if (off + count > size)
1271 memcpy_fromio(buf, rom + off, count);
1273 pci_unmap_rom(pdev, rom);
1278 static struct bin_attribute pci_config_attr = {
1281 .mode = S_IRUGO | S_IWUSR,
1283 .size = PCI_CFG_SPACE_SIZE,
1284 .read = pci_read_config,
1285 .write = pci_write_config,
1288 static struct bin_attribute pcie_config_attr = {
1291 .mode = S_IRUGO | S_IWUSR,
1293 .size = PCI_CFG_SPACE_EXP_SIZE,
1294 .read = pci_read_config,
1295 .write = pci_write_config,
1298 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1299 const char *buf, size_t count)
1301 struct pci_dev *pdev = to_pci_dev(dev);
1303 ssize_t result = kstrtoul(buf, 0, &val);
1311 result = pci_reset_function(pdev);
1318 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1320 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1323 struct bin_attribute *attr;
1325 /* If the device has VPD, try to expose it in sysfs. */
1327 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1331 sysfs_bin_attr_init(attr);
1332 attr->size = dev->vpd->len;
1333 attr->attr.name = "vpd";
1334 attr->attr.mode = S_IRUSR | S_IWUSR;
1335 attr->read = read_vpd_attr;
1336 attr->write = write_vpd_attr;
1337 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1342 dev->vpd->attr = attr;
1345 /* Active State Power Management */
1346 pcie_aspm_create_sysfs_dev_files(dev);
1348 if (!pci_probe_reset_function(dev)) {
1349 retval = device_create_file(&dev->dev, &reset_attr);
1357 pcie_aspm_remove_sysfs_dev_files(dev);
1358 if (dev->vpd && dev->vpd->attr) {
1359 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1360 kfree(dev->vpd->attr);
1366 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1370 struct bin_attribute *attr;
1372 if (!sysfs_initialized)
1375 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1376 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1378 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1382 retval = pci_create_resource_files(pdev);
1384 goto err_config_file;
1386 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1387 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1388 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1391 /* If the device has a ROM, try to expose it in sysfs. */
1393 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1396 goto err_resource_files;
1398 sysfs_bin_attr_init(attr);
1399 attr->size = rom_size;
1400 attr->attr.name = "rom";
1401 attr->attr.mode = S_IRUSR | S_IWUSR;
1402 attr->read = pci_read_rom;
1403 attr->write = pci_write_rom;
1404 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1407 goto err_resource_files;
1409 pdev->rom_attr = attr;
1412 /* add sysfs entries for various capabilities */
1413 retval = pci_create_capabilities_sysfs(pdev);
1417 pci_create_firmware_label_files(pdev);
1423 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1424 kfree(pdev->rom_attr);
1425 pdev->rom_attr = NULL;
1428 pci_remove_resource_files(pdev);
1430 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1431 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1433 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1438 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1440 if (dev->vpd && dev->vpd->attr) {
1441 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1442 kfree(dev->vpd->attr);
1445 pcie_aspm_remove_sysfs_dev_files(dev);
1446 if (dev->reset_fn) {
1447 device_remove_file(&dev->dev, &reset_attr);
1453 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1454 * @pdev: device whose entries we should free
1456 * Cleanup when @pdev is removed from sysfs.
1458 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1462 if (!sysfs_initialized)
1465 pci_remove_capabilities_sysfs(pdev);
1467 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1468 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1470 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1472 pci_remove_resource_files(pdev);
1474 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1475 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1476 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1479 if (rom_size && pdev->rom_attr) {
1480 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1481 kfree(pdev->rom_attr);
1484 pci_remove_firmware_label_files(pdev);
1488 static int __init pci_sysfs_init(void)
1490 struct pci_dev *pdev = NULL;
1493 sysfs_initialized = 1;
1494 for_each_pci_dev(pdev) {
1495 retval = pci_create_sysfs_dev_files(pdev);
1504 late_initcall(pci_sysfs_init);
1506 static struct attribute *pci_dev_dev_attrs[] = {
1511 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1512 struct attribute *a, int n)
1514 struct device *dev = container_of(kobj, struct device, kobj);
1515 struct pci_dev *pdev = to_pci_dev(dev);
1517 if (a == &vga_attr.attr)
1518 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1524 static struct attribute *pci_dev_hp_attrs[] = {
1525 &dev_remove_attr.attr,
1526 &dev_rescan_attr.attr,
1530 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1531 struct attribute *a, int n)
1533 struct device *dev = container_of(kobj, struct device, kobj);
1534 struct pci_dev *pdev = to_pci_dev(dev);
1536 if (pdev->is_virtfn)
1542 static struct attribute_group pci_dev_hp_attr_group = {
1543 .attrs = pci_dev_hp_attrs,
1544 .is_visible = pci_dev_hp_attrs_are_visible,
1547 #ifdef CONFIG_PCI_IOV
1548 static struct attribute *sriov_dev_attrs[] = {
1549 &sriov_totalvfs_attr.attr,
1550 &sriov_numvfs_attr.attr,
1554 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1555 struct attribute *a, int n)
1557 struct device *dev = container_of(kobj, struct device, kobj);
1559 if (!dev_is_pf(dev))
1565 static struct attribute_group sriov_dev_attr_group = {
1566 .attrs = sriov_dev_attrs,
1567 .is_visible = sriov_attrs_are_visible,
1569 #endif /* CONFIG_PCI_IOV */
1571 static struct attribute_group pci_dev_attr_group = {
1572 .attrs = pci_dev_dev_attrs,
1573 .is_visible = pci_dev_attrs_are_visible,
1576 static const struct attribute_group *pci_dev_attr_groups[] = {
1577 &pci_dev_attr_group,
1578 &pci_dev_hp_attr_group,
1579 #ifdef CONFIG_PCI_IOV
1580 &sriov_dev_attr_group,
1585 struct device_type pci_dev_type = {
1586 .groups = pci_dev_attr_groups,