1 // SPDX-License-Identifier: GPL-2.0
4 * (C) Copyright 2002-2004 IBM Corp.
5 * (C) Copyright 2003 Matthew Wilcox
6 * (C) Copyright 2003 Hewlett-Packard
10 * File attributes for PCI devices
12 * Modeled after usb's driverfs.c
16 #include <linux/kernel.h>
17 #include <linux/sched.h>
18 #include <linux/pci.h>
19 #include <linux/stat.h>
20 #include <linux/export.h>
21 #include <linux/topology.h>
24 #include <linux/capability.h>
25 #include <linux/security.h>
26 #include <linux/slab.h>
27 #include <linux/vgaarb.h>
28 #include <linux/pm_runtime.h>
32 static int sysfs_initialized; /* = 0 */
34 /* show configuration fields */
35 #define pci_config_attr(field, format_string) \
37 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
39 struct pci_dev *pdev; \
41 pdev = to_pci_dev(dev); \
42 return sprintf(buf, format_string, pdev->field); \
44 static DEVICE_ATTR_RO(field)
46 pci_config_attr(vendor, "0x%04x\n");
47 pci_config_attr(device, "0x%04x\n");
48 pci_config_attr(subsystem_vendor, "0x%04x\n");
49 pci_config_attr(subsystem_device, "0x%04x\n");
50 pci_config_attr(revision, "0x%02x\n");
51 pci_config_attr(class, "0x%06x\n");
52 pci_config_attr(irq, "%u\n");
54 static ssize_t broken_parity_status_show(struct device *dev,
55 struct device_attribute *attr,
58 struct pci_dev *pdev = to_pci_dev(dev);
59 return sprintf(buf, "%u\n", pdev->broken_parity_status);
62 static ssize_t broken_parity_status_store(struct device *dev,
63 struct device_attribute *attr,
64 const char *buf, size_t count)
66 struct pci_dev *pdev = to_pci_dev(dev);
69 if (kstrtoul(buf, 0, &val) < 0)
72 pdev->broken_parity_status = !!val;
76 static DEVICE_ATTR_RW(broken_parity_status);
78 static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
79 struct device_attribute *attr, char *buf)
81 const struct cpumask *mask;
84 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
85 cpumask_of_node(dev_to_node(dev));
87 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
89 return cpumap_print_to_pagebuf(list, buf, mask);
92 static ssize_t local_cpus_show(struct device *dev,
93 struct device_attribute *attr, char *buf)
95 return pci_dev_show_local_cpu(dev, false, attr, buf);
97 static DEVICE_ATTR_RO(local_cpus);
99 static ssize_t local_cpulist_show(struct device *dev,
100 struct device_attribute *attr, char *buf)
102 return pci_dev_show_local_cpu(dev, true, attr, buf);
104 static DEVICE_ATTR_RO(local_cpulist);
107 * PCI Bus Class Devices
109 static ssize_t cpuaffinity_show(struct device *dev,
110 struct device_attribute *attr, char *buf)
112 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
114 return cpumap_print_to_pagebuf(false, buf, cpumask);
116 static DEVICE_ATTR_RO(cpuaffinity);
118 static ssize_t cpulistaffinity_show(struct device *dev,
119 struct device_attribute *attr, char *buf)
121 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
123 return cpumap_print_to_pagebuf(true, buf, cpumask);
125 static DEVICE_ATTR_RO(cpulistaffinity);
128 static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
131 struct pci_dev *pci_dev = to_pci_dev(dev);
135 resource_size_t start, end;
137 if (pci_dev->subordinate)
138 max = DEVICE_COUNT_RESOURCE;
140 max = PCI_BRIDGE_RESOURCES;
142 for (i = 0; i < max; i++) {
143 struct resource *res = &pci_dev->resource[i];
144 pci_resource_to_user(pci_dev, i, res, &start, &end);
145 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
146 (unsigned long long)start,
147 (unsigned long long)end,
148 (unsigned long long)res->flags);
152 static DEVICE_ATTR_RO(resource);
154 static ssize_t max_link_speed_show(struct device *dev,
155 struct device_attribute *attr, char *buf)
157 struct pci_dev *pdev = to_pci_dev(dev);
159 return sprintf(buf, "%s\n", PCIE_SPEED2STR(pcie_get_speed_cap(pdev)));
161 static DEVICE_ATTR_RO(max_link_speed);
163 static ssize_t max_link_width_show(struct device *dev,
164 struct device_attribute *attr, char *buf)
166 struct pci_dev *pdev = to_pci_dev(dev);
168 return sprintf(buf, "%u\n", pcie_get_width_cap(pdev));
170 static DEVICE_ATTR_RO(max_link_width);
172 static ssize_t current_link_speed_show(struct device *dev,
173 struct device_attribute *attr, char *buf)
175 struct pci_dev *pci_dev = to_pci_dev(dev);
180 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
184 switch (linkstat & PCI_EXP_LNKSTA_CLS) {
185 case PCI_EXP_LNKSTA_CLS_16_0GB:
188 case PCI_EXP_LNKSTA_CLS_8_0GB:
191 case PCI_EXP_LNKSTA_CLS_5_0GB:
194 case PCI_EXP_LNKSTA_CLS_2_5GB:
198 speed = "Unknown speed";
201 return sprintf(buf, "%s\n", speed);
203 static DEVICE_ATTR_RO(current_link_speed);
205 static ssize_t current_link_width_show(struct device *dev,
206 struct device_attribute *attr, char *buf)
208 struct pci_dev *pci_dev = to_pci_dev(dev);
212 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
216 return sprintf(buf, "%u\n",
217 (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
219 static DEVICE_ATTR_RO(current_link_width);
221 static ssize_t secondary_bus_number_show(struct device *dev,
222 struct device_attribute *attr,
225 struct pci_dev *pci_dev = to_pci_dev(dev);
229 err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
233 return sprintf(buf, "%u\n", sec_bus);
235 static DEVICE_ATTR_RO(secondary_bus_number);
237 static ssize_t subordinate_bus_number_show(struct device *dev,
238 struct device_attribute *attr,
241 struct pci_dev *pci_dev = to_pci_dev(dev);
245 err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
249 return sprintf(buf, "%u\n", sub_bus);
251 static DEVICE_ATTR_RO(subordinate_bus_number);
253 static ssize_t ari_enabled_show(struct device *dev,
254 struct device_attribute *attr,
257 struct pci_dev *pci_dev = to_pci_dev(dev);
259 return sprintf(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
261 static DEVICE_ATTR_RO(ari_enabled);
263 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
266 struct pci_dev *pci_dev = to_pci_dev(dev);
268 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
269 pci_dev->vendor, pci_dev->device,
270 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
271 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
272 (u8)(pci_dev->class));
274 static DEVICE_ATTR_RO(modalias);
276 static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
277 const char *buf, size_t count)
279 struct pci_dev *pdev = to_pci_dev(dev);
281 ssize_t result = kstrtoul(buf, 0, &val);
286 /* this can crash the machine when done on the "wrong" device */
287 if (!capable(CAP_SYS_ADMIN))
294 result = pci_enable_device(pdev);
295 else if (pci_is_enabled(pdev))
296 pci_disable_device(pdev);
301 return result < 0 ? result : count;
304 static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
307 struct pci_dev *pdev;
309 pdev = to_pci_dev(dev);
310 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
312 static DEVICE_ATTR_RW(enable);
315 static ssize_t numa_node_store(struct device *dev,
316 struct device_attribute *attr, const char *buf,
319 struct pci_dev *pdev = to_pci_dev(dev);
322 if (!capable(CAP_SYS_ADMIN))
325 ret = kstrtoint(buf, 0, &node);
329 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
332 if (node != NUMA_NO_NODE && !node_online(node))
335 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
336 pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
339 dev->numa_node = node;
343 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
346 return sprintf(buf, "%d\n", dev->numa_node);
348 static DEVICE_ATTR_RW(numa_node);
351 static ssize_t dma_mask_bits_show(struct device *dev,
352 struct device_attribute *attr, char *buf)
354 struct pci_dev *pdev = to_pci_dev(dev);
356 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
358 static DEVICE_ATTR_RO(dma_mask_bits);
360 static ssize_t consistent_dma_mask_bits_show(struct device *dev,
361 struct device_attribute *attr,
364 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
366 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
368 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
371 struct pci_dev *pdev = to_pci_dev(dev);
372 struct pci_bus *subordinate = pdev->subordinate;
374 return sprintf(buf, "%u\n", subordinate ?
375 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
379 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
380 const char *buf, size_t count)
382 struct pci_dev *pdev = to_pci_dev(dev);
383 struct pci_bus *subordinate = pdev->subordinate;
386 if (kstrtoul(buf, 0, &val) < 0)
389 if (!capable(CAP_SYS_ADMIN))
393 * "no_msi" and "bus_flags" only affect what happens when a driver
394 * requests MSI or MSI-X. They don't affect any drivers that have
395 * already requested MSI or MSI-X.
399 pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
400 val ? "allowed" : "disallowed");
405 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
407 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
409 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
410 val ? "allowed" : "disallowed");
413 static DEVICE_ATTR_RW(msi_bus);
415 static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count)
418 struct pci_bus *b = NULL;
420 if (kstrtoul(buf, 0, &val) < 0)
424 pci_lock_rescan_remove();
425 while ((b = pci_find_next_bus(b)) != NULL)
427 pci_unlock_rescan_remove();
431 static BUS_ATTR_WO(rescan);
433 static struct attribute *pci_bus_attrs[] = {
434 &bus_attr_rescan.attr,
438 static const struct attribute_group pci_bus_group = {
439 .attrs = pci_bus_attrs,
442 const struct attribute_group *pci_bus_groups[] = {
447 static ssize_t dev_rescan_store(struct device *dev,
448 struct device_attribute *attr, const char *buf,
452 struct pci_dev *pdev = to_pci_dev(dev);
454 if (kstrtoul(buf, 0, &val) < 0)
458 pci_lock_rescan_remove();
459 pci_rescan_bus(pdev->bus);
460 pci_unlock_rescan_remove();
464 static struct device_attribute dev_rescan_attr = __ATTR(rescan,
466 NULL, dev_rescan_store);
468 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
469 const char *buf, size_t count)
473 if (kstrtoul(buf, 0, &val) < 0)
476 if (val && device_remove_file_self(dev, attr))
477 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
480 static struct device_attribute dev_remove_attr = __ATTR(remove,
484 static ssize_t dev_bus_rescan_store(struct device *dev,
485 struct device_attribute *attr,
486 const char *buf, size_t count)
489 struct pci_bus *bus = to_pci_bus(dev);
491 if (kstrtoul(buf, 0, &val) < 0)
495 pci_lock_rescan_remove();
496 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
497 pci_rescan_bus_bridge_resize(bus->self);
500 pci_unlock_rescan_remove();
504 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
506 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
507 static ssize_t d3cold_allowed_store(struct device *dev,
508 struct device_attribute *attr,
509 const char *buf, size_t count)
511 struct pci_dev *pdev = to_pci_dev(dev);
514 if (kstrtoul(buf, 0, &val) < 0)
517 pdev->d3cold_allowed = !!val;
518 if (pdev->d3cold_allowed)
519 pci_d3cold_enable(pdev);
521 pci_d3cold_disable(pdev);
523 pm_runtime_resume(dev);
528 static ssize_t d3cold_allowed_show(struct device *dev,
529 struct device_attribute *attr, char *buf)
531 struct pci_dev *pdev = to_pci_dev(dev);
532 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
534 static DEVICE_ATTR_RW(d3cold_allowed);
538 static ssize_t devspec_show(struct device *dev,
539 struct device_attribute *attr, char *buf)
541 struct pci_dev *pdev = to_pci_dev(dev);
542 struct device_node *np = pci_device_to_OF_node(pdev);
546 return sprintf(buf, "%pOF", np);
548 static DEVICE_ATTR_RO(devspec);
551 #ifdef CONFIG_PCI_IOV
552 static ssize_t sriov_totalvfs_show(struct device *dev,
553 struct device_attribute *attr,
556 struct pci_dev *pdev = to_pci_dev(dev);
558 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
562 static ssize_t sriov_numvfs_show(struct device *dev,
563 struct device_attribute *attr,
566 struct pci_dev *pdev = to_pci_dev(dev);
568 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
572 * num_vfs > 0; number of VFs to enable
573 * num_vfs = 0; disable all VFs
575 * Note: SRIOV spec doesn't allow partial VF
576 * disable, so it's all or none.
578 static ssize_t sriov_numvfs_store(struct device *dev,
579 struct device_attribute *attr,
580 const char *buf, size_t count)
582 struct pci_dev *pdev = to_pci_dev(dev);
586 ret = kstrtou16(buf, 0, &num_vfs);
590 if (num_vfs > pci_sriov_get_totalvfs(pdev))
593 device_lock(&pdev->dev);
595 if (num_vfs == pdev->sriov->num_VFs)
598 /* is PF driver loaded w/callback */
599 if (!pdev->driver || !pdev->driver->sriov_configure) {
600 pci_info(pdev, "Driver doesn't support SRIOV configuration via sysfs\n");
607 ret = pdev->driver->sriov_configure(pdev, 0);
612 if (pdev->sriov->num_VFs) {
613 pci_warn(pdev, "%d VFs already enabled. Disable before enabling %d VFs\n",
614 pdev->sriov->num_VFs, num_vfs);
619 ret = pdev->driver->sriov_configure(pdev, num_vfs);
624 pci_warn(pdev, "%d VFs requested; only %d enabled\n",
628 device_unlock(&pdev->dev);
636 static ssize_t sriov_offset_show(struct device *dev,
637 struct device_attribute *attr,
640 struct pci_dev *pdev = to_pci_dev(dev);
642 return sprintf(buf, "%u\n", pdev->sriov->offset);
645 static ssize_t sriov_stride_show(struct device *dev,
646 struct device_attribute *attr,
649 struct pci_dev *pdev = to_pci_dev(dev);
651 return sprintf(buf, "%u\n", pdev->sriov->stride);
654 static ssize_t sriov_vf_device_show(struct device *dev,
655 struct device_attribute *attr,
658 struct pci_dev *pdev = to_pci_dev(dev);
660 return sprintf(buf, "%x\n", pdev->sriov->vf_device);
663 static ssize_t sriov_drivers_autoprobe_show(struct device *dev,
664 struct device_attribute *attr,
667 struct pci_dev *pdev = to_pci_dev(dev);
669 return sprintf(buf, "%u\n", pdev->sriov->drivers_autoprobe);
672 static ssize_t sriov_drivers_autoprobe_store(struct device *dev,
673 struct device_attribute *attr,
674 const char *buf, size_t count)
676 struct pci_dev *pdev = to_pci_dev(dev);
677 bool drivers_autoprobe;
679 if (kstrtobool(buf, &drivers_autoprobe) < 0)
682 pdev->sriov->drivers_autoprobe = drivers_autoprobe;
687 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
688 static struct device_attribute sriov_numvfs_attr =
689 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
690 sriov_numvfs_show, sriov_numvfs_store);
691 static struct device_attribute sriov_offset_attr = __ATTR_RO(sriov_offset);
692 static struct device_attribute sriov_stride_attr = __ATTR_RO(sriov_stride);
693 static struct device_attribute sriov_vf_device_attr = __ATTR_RO(sriov_vf_device);
694 static struct device_attribute sriov_drivers_autoprobe_attr =
695 __ATTR(sriov_drivers_autoprobe, (S_IRUGO|S_IWUSR|S_IWGRP),
696 sriov_drivers_autoprobe_show, sriov_drivers_autoprobe_store);
697 #endif /* CONFIG_PCI_IOV */
699 static ssize_t driver_override_store(struct device *dev,
700 struct device_attribute *attr,
701 const char *buf, size_t count)
703 struct pci_dev *pdev = to_pci_dev(dev);
704 char *driver_override, *old, *cp;
706 /* We need to keep extra room for a newline */
707 if (count >= (PAGE_SIZE - 1))
710 driver_override = kstrndup(buf, count, GFP_KERNEL);
711 if (!driver_override)
714 cp = strchr(driver_override, '\n');
719 old = pdev->driver_override;
720 if (strlen(driver_override)) {
721 pdev->driver_override = driver_override;
723 kfree(driver_override);
724 pdev->driver_override = NULL;
733 static ssize_t driver_override_show(struct device *dev,
734 struct device_attribute *attr, char *buf)
736 struct pci_dev *pdev = to_pci_dev(dev);
740 len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
744 static DEVICE_ATTR_RW(driver_override);
746 static struct attribute *pci_dev_attrs[] = {
747 &dev_attr_resource.attr,
748 &dev_attr_vendor.attr,
749 &dev_attr_device.attr,
750 &dev_attr_subsystem_vendor.attr,
751 &dev_attr_subsystem_device.attr,
752 &dev_attr_revision.attr,
753 &dev_attr_class.attr,
755 &dev_attr_local_cpus.attr,
756 &dev_attr_local_cpulist.attr,
757 &dev_attr_modalias.attr,
759 &dev_attr_numa_node.attr,
761 &dev_attr_dma_mask_bits.attr,
762 &dev_attr_consistent_dma_mask_bits.attr,
763 &dev_attr_enable.attr,
764 &dev_attr_broken_parity_status.attr,
765 &dev_attr_msi_bus.attr,
766 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
767 &dev_attr_d3cold_allowed.attr,
770 &dev_attr_devspec.attr,
772 &dev_attr_driver_override.attr,
773 &dev_attr_ari_enabled.attr,
777 static struct attribute *pci_bridge_attrs[] = {
778 &dev_attr_subordinate_bus_number.attr,
779 &dev_attr_secondary_bus_number.attr,
783 static struct attribute *pcie_dev_attrs[] = {
784 &dev_attr_current_link_speed.attr,
785 &dev_attr_current_link_width.attr,
786 &dev_attr_max_link_width.attr,
787 &dev_attr_max_link_speed.attr,
791 static struct attribute *pcibus_attrs[] = {
792 &dev_attr_rescan.attr,
793 &dev_attr_cpuaffinity.attr,
794 &dev_attr_cpulistaffinity.attr,
798 static const struct attribute_group pcibus_group = {
799 .attrs = pcibus_attrs,
802 const struct attribute_group *pcibus_groups[] = {
807 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
810 struct pci_dev *pdev = to_pci_dev(dev);
811 struct pci_dev *vga_dev = vga_default_device();
814 return sprintf(buf, "%u\n", (pdev == vga_dev));
816 return sprintf(buf, "%u\n",
817 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
818 IORESOURCE_ROM_SHADOW));
820 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
822 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
823 struct bin_attribute *bin_attr, char *buf,
824 loff_t off, size_t count)
826 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
827 unsigned int size = 64;
828 loff_t init_off = off;
829 u8 *data = (u8 *) buf;
831 /* Several chips lock up trying to read undefined config space */
832 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
833 size = dev->cfg_size;
834 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
839 if (off + count > size) {
846 pci_config_pm_runtime_get(dev);
848 if ((off & 1) && size) {
850 pci_user_read_config_byte(dev, off, &val);
851 data[off - init_off] = val;
856 if ((off & 3) && size > 2) {
858 pci_user_read_config_word(dev, off, &val);
859 data[off - init_off] = val & 0xff;
860 data[off - init_off + 1] = (val >> 8) & 0xff;
867 pci_user_read_config_dword(dev, off, &val);
868 data[off - init_off] = val & 0xff;
869 data[off - init_off + 1] = (val >> 8) & 0xff;
870 data[off - init_off + 2] = (val >> 16) & 0xff;
871 data[off - init_off + 3] = (val >> 24) & 0xff;
878 pci_user_read_config_word(dev, off, &val);
879 data[off - init_off] = val & 0xff;
880 data[off - init_off + 1] = (val >> 8) & 0xff;
887 pci_user_read_config_byte(dev, off, &val);
888 data[off - init_off] = val;
893 pci_config_pm_runtime_put(dev);
898 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
899 struct bin_attribute *bin_attr, char *buf,
900 loff_t off, size_t count)
902 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
903 unsigned int size = count;
904 loff_t init_off = off;
905 u8 *data = (u8 *) buf;
907 if (off > dev->cfg_size)
909 if (off + count > dev->cfg_size) {
910 size = dev->cfg_size - off;
914 pci_config_pm_runtime_get(dev);
916 if ((off & 1) && size) {
917 pci_user_write_config_byte(dev, off, data[off - init_off]);
922 if ((off & 3) && size > 2) {
923 u16 val = data[off - init_off];
924 val |= (u16) data[off - init_off + 1] << 8;
925 pci_user_write_config_word(dev, off, val);
931 u32 val = data[off - init_off];
932 val |= (u32) data[off - init_off + 1] << 8;
933 val |= (u32) data[off - init_off + 2] << 16;
934 val |= (u32) data[off - init_off + 3] << 24;
935 pci_user_write_config_dword(dev, off, val);
941 u16 val = data[off - init_off];
942 val |= (u16) data[off - init_off + 1] << 8;
943 pci_user_write_config_word(dev, off, val);
949 pci_user_write_config_byte(dev, off, data[off - init_off]);
954 pci_config_pm_runtime_put(dev);
959 #ifdef HAVE_PCI_LEGACY
961 * pci_read_legacy_io - read byte(s) from legacy I/O port space
962 * @filp: open sysfs file
963 * @kobj: kobject corresponding to file to read from
964 * @bin_attr: struct bin_attribute for this file
965 * @buf: buffer to store results
966 * @off: offset into legacy I/O port space
967 * @count: number of bytes to read
969 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
970 * callback routine (pci_legacy_read).
972 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
973 struct bin_attribute *bin_attr, char *buf,
974 loff_t off, size_t count)
976 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
978 /* Only support 1, 2 or 4 byte accesses */
979 if (count != 1 && count != 2 && count != 4)
982 return pci_legacy_read(bus, off, (u32 *)buf, count);
986 * pci_write_legacy_io - write byte(s) to legacy I/O port space
987 * @filp: open sysfs file
988 * @kobj: kobject corresponding to file to read from
989 * @bin_attr: struct bin_attribute for this file
990 * @buf: buffer containing value to be written
991 * @off: offset into legacy I/O port space
992 * @count: number of bytes to write
994 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
995 * callback routine (pci_legacy_write).
997 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
998 struct bin_attribute *bin_attr, char *buf,
999 loff_t off, size_t count)
1001 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1003 /* Only support 1, 2 or 4 byte accesses */
1004 if (count != 1 && count != 2 && count != 4)
1007 return pci_legacy_write(bus, off, *(u32 *)buf, count);
1011 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
1012 * @filp: open sysfs file
1013 * @kobj: kobject corresponding to device to be mapped
1014 * @attr: struct bin_attribute for this file
1015 * @vma: struct vm_area_struct passed to mmap
1017 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
1018 * legacy memory space (first meg of bus space) into application virtual
1021 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
1022 struct bin_attribute *attr,
1023 struct vm_area_struct *vma)
1025 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1027 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
1031 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
1032 * @filp: open sysfs file
1033 * @kobj: kobject corresponding to device to be mapped
1034 * @attr: struct bin_attribute for this file
1035 * @vma: struct vm_area_struct passed to mmap
1037 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
1038 * legacy IO space (first meg of bus space) into application virtual
1039 * memory space. Returns -ENOSYS if the operation isn't supported
1041 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
1042 struct bin_attribute *attr,
1043 struct vm_area_struct *vma)
1045 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
1047 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
1051 * pci_adjust_legacy_attr - adjustment of legacy file attributes
1052 * @b: bus to create files under
1053 * @mmap_type: I/O port or memory
1055 * Stub implementation. Can be overridden by arch if necessary.
1057 void __weak pci_adjust_legacy_attr(struct pci_bus *b,
1058 enum pci_mmap_state mmap_type)
1063 * pci_create_legacy_files - create legacy I/O port and memory files
1064 * @b: bus to create files under
1066 * Some platforms allow access to legacy I/O port and ISA memory space on
1067 * a per-bus basis. This routine creates the files and ties them into
1068 * their associated read, write and mmap files from pci-sysfs.c
1070 * On error unwind, but don't propagate the error to the caller
1071 * as it is ok to set up the PCI bus without these files.
1073 void pci_create_legacy_files(struct pci_bus *b)
1077 b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
1082 sysfs_bin_attr_init(b->legacy_io);
1083 b->legacy_io->attr.name = "legacy_io";
1084 b->legacy_io->size = 0xffff;
1085 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
1086 b->legacy_io->read = pci_read_legacy_io;
1087 b->legacy_io->write = pci_write_legacy_io;
1088 b->legacy_io->mmap = pci_mmap_legacy_io;
1089 pci_adjust_legacy_attr(b, pci_mmap_io);
1090 error = device_create_bin_file(&b->dev, b->legacy_io);
1094 /* Allocated above after the legacy_io struct */
1095 b->legacy_mem = b->legacy_io + 1;
1096 sysfs_bin_attr_init(b->legacy_mem);
1097 b->legacy_mem->attr.name = "legacy_mem";
1098 b->legacy_mem->size = 1024*1024;
1099 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
1100 b->legacy_mem->mmap = pci_mmap_legacy_mem;
1101 pci_adjust_legacy_attr(b, pci_mmap_mem);
1102 error = device_create_bin_file(&b->dev, b->legacy_mem);
1104 goto legacy_mem_err;
1109 device_remove_bin_file(&b->dev, b->legacy_io);
1111 kfree(b->legacy_io);
1112 b->legacy_io = NULL;
1114 dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n");
1117 void pci_remove_legacy_files(struct pci_bus *b)
1120 device_remove_bin_file(&b->dev, b->legacy_io);
1121 device_remove_bin_file(&b->dev, b->legacy_mem);
1122 kfree(b->legacy_io); /* both are allocated here */
1125 #endif /* HAVE_PCI_LEGACY */
1127 #if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
1129 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
1130 enum pci_mmap_api mmap_api)
1132 unsigned long nr, start, size;
1133 resource_size_t pci_start = 0, pci_end;
1135 if (pci_resource_len(pdev, resno) == 0)
1137 nr = vma_pages(vma);
1138 start = vma->vm_pgoff;
1139 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
1140 if (mmap_api == PCI_MMAP_PROCFS) {
1141 pci_resource_to_user(pdev, resno, &pdev->resource[resno],
1142 &pci_start, &pci_end);
1143 pci_start >>= PAGE_SHIFT;
1145 if (start >= pci_start && start < pci_start + size &&
1146 start + nr <= pci_start + size)
1152 * pci_mmap_resource - map a PCI resource into user memory space
1153 * @kobj: kobject for mapping
1154 * @attr: struct bin_attribute for the file being mapped
1155 * @vma: struct vm_area_struct passed into the mmap
1156 * @write_combine: 1 for write_combine mapping
1158 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1160 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1161 struct vm_area_struct *vma, int write_combine)
1163 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1164 int bar = (unsigned long)attr->private;
1165 enum pci_mmap_state mmap_type;
1166 struct resource *res = &pdev->resource[bar];
1168 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1171 if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1174 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1176 return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1179 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1180 struct bin_attribute *attr,
1181 struct vm_area_struct *vma)
1183 return pci_mmap_resource(kobj, attr, vma, 0);
1186 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1187 struct bin_attribute *attr,
1188 struct vm_area_struct *vma)
1190 return pci_mmap_resource(kobj, attr, vma, 1);
1193 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1194 struct bin_attribute *attr, char *buf,
1195 loff_t off, size_t count, bool write)
1197 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1198 int bar = (unsigned long)attr->private;
1199 unsigned long port = off;
1201 port += pci_resource_start(pdev, bar);
1203 if (port > pci_resource_end(pdev, bar))
1206 if (port + count - 1 > pci_resource_end(pdev, bar))
1212 outb(*(u8 *)buf, port);
1214 *(u8 *)buf = inb(port);
1218 outw(*(u16 *)buf, port);
1220 *(u16 *)buf = inw(port);
1224 outl(*(u32 *)buf, port);
1226 *(u32 *)buf = inl(port);
1232 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1233 struct bin_attribute *attr, char *buf,
1234 loff_t off, size_t count)
1236 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1239 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1240 struct bin_attribute *attr, char *buf,
1241 loff_t off, size_t count)
1243 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1247 * pci_remove_resource_files - cleanup resource files
1248 * @pdev: dev to cleanup
1250 * If we created resource files for @pdev, remove them from sysfs and
1251 * free their resources.
1253 static void pci_remove_resource_files(struct pci_dev *pdev)
1257 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1258 struct bin_attribute *res_attr;
1260 res_attr = pdev->res_attr[i];
1262 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1266 res_attr = pdev->res_attr_wc[i];
1268 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1274 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1276 /* allocate attribute structure, piggyback attribute name */
1277 int name_len = write_combine ? 13 : 10;
1278 struct bin_attribute *res_attr;
1279 char *res_attr_name;
1282 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1286 res_attr_name = (char *)(res_attr + 1);
1288 sysfs_bin_attr_init(res_attr);
1289 if (write_combine) {
1290 pdev->res_attr_wc[num] = res_attr;
1291 sprintf(res_attr_name, "resource%d_wc", num);
1292 res_attr->mmap = pci_mmap_resource_wc;
1294 pdev->res_attr[num] = res_attr;
1295 sprintf(res_attr_name, "resource%d", num);
1296 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1297 res_attr->read = pci_read_resource_io;
1298 res_attr->write = pci_write_resource_io;
1299 if (arch_can_pci_mmap_io())
1300 res_attr->mmap = pci_mmap_resource_uc;
1302 res_attr->mmap = pci_mmap_resource_uc;
1305 res_attr->attr.name = res_attr_name;
1306 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1307 res_attr->size = pci_resource_len(pdev, num);
1308 res_attr->private = (void *)(unsigned long)num;
1309 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1317 * pci_create_resource_files - create resource files in sysfs for @dev
1318 * @pdev: dev in question
1320 * Walk the resources in @pdev creating files for each resource available.
1322 static int pci_create_resource_files(struct pci_dev *pdev)
1327 /* Expose the PCI resources from this device as files */
1328 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1330 /* skip empty resources */
1331 if (!pci_resource_len(pdev, i))
1334 retval = pci_create_attr(pdev, i, 0);
1335 /* for prefetchable resources, create a WC mappable file */
1336 if (!retval && arch_can_pci_mmap_wc() &&
1337 pdev->resource[i].flags & IORESOURCE_PREFETCH)
1338 retval = pci_create_attr(pdev, i, 1);
1340 pci_remove_resource_files(pdev);
1346 #else /* !HAVE_PCI_MMAP */
1347 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1348 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1349 #endif /* HAVE_PCI_MMAP */
1352 * pci_write_rom - used to enable access to the PCI ROM display
1354 * @kobj: kernel object handle
1355 * @bin_attr: struct bin_attribute for this file
1358 * @count: number of byte in input
1360 * writing anything except 0 enables it
1362 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1363 struct bin_attribute *bin_attr, char *buf,
1364 loff_t off, size_t count)
1366 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1368 if ((off == 0) && (*buf == '0') && (count == 2))
1369 pdev->rom_attr_enabled = 0;
1371 pdev->rom_attr_enabled = 1;
1377 * pci_read_rom - read a PCI ROM
1379 * @kobj: kernel object handle
1380 * @bin_attr: struct bin_attribute for this file
1381 * @buf: where to put the data we read from the ROM
1383 * @count: number of bytes to read
1385 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1386 * device corresponding to @kobj.
1388 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1389 struct bin_attribute *bin_attr, char *buf,
1390 loff_t off, size_t count)
1392 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1396 if (!pdev->rom_attr_enabled)
1399 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1406 if (off + count > size)
1409 memcpy_fromio(buf, rom + off, count);
1411 pci_unmap_rom(pdev, rom);
1416 static const struct bin_attribute pci_config_attr = {
1419 .mode = S_IRUGO | S_IWUSR,
1421 .size = PCI_CFG_SPACE_SIZE,
1422 .read = pci_read_config,
1423 .write = pci_write_config,
1426 static const struct bin_attribute pcie_config_attr = {
1429 .mode = S_IRUGO | S_IWUSR,
1431 .size = PCI_CFG_SPACE_EXP_SIZE,
1432 .read = pci_read_config,
1433 .write = pci_write_config,
1436 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1437 const char *buf, size_t count)
1439 struct pci_dev *pdev = to_pci_dev(dev);
1441 ssize_t result = kstrtoul(buf, 0, &val);
1449 pm_runtime_get_sync(dev);
1450 result = pci_reset_function(pdev);
1451 pm_runtime_put(dev);
1458 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1460 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1464 pcie_vpd_create_sysfs_dev_files(dev);
1465 pcie_aspm_create_sysfs_dev_files(dev);
1467 if (dev->reset_fn) {
1468 retval = device_create_file(&dev->dev, &reset_attr);
1475 pcie_aspm_remove_sysfs_dev_files(dev);
1476 pcie_vpd_remove_sysfs_dev_files(dev);
1480 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1484 struct bin_attribute *attr;
1486 if (!sysfs_initialized)
1489 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1490 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1492 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1496 retval = pci_create_resource_files(pdev);
1498 goto err_config_file;
1500 /* If the device has a ROM, try to expose it in sysfs. */
1501 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1503 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1506 goto err_resource_files;
1508 sysfs_bin_attr_init(attr);
1509 attr->size = rom_size;
1510 attr->attr.name = "rom";
1511 attr->attr.mode = S_IRUSR | S_IWUSR;
1512 attr->read = pci_read_rom;
1513 attr->write = pci_write_rom;
1514 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1517 goto err_resource_files;
1519 pdev->rom_attr = attr;
1522 /* add sysfs entries for various capabilities */
1523 retval = pci_create_capabilities_sysfs(pdev);
1527 pci_create_firmware_label_files(pdev);
1532 if (pdev->rom_attr) {
1533 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1534 kfree(pdev->rom_attr);
1535 pdev->rom_attr = NULL;
1538 pci_remove_resource_files(pdev);
1540 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1541 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1543 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1548 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1550 pcie_vpd_remove_sysfs_dev_files(dev);
1551 pcie_aspm_remove_sysfs_dev_files(dev);
1552 if (dev->reset_fn) {
1553 device_remove_file(&dev->dev, &reset_attr);
1559 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1560 * @pdev: device whose entries we should free
1562 * Cleanup when @pdev is removed from sysfs.
1564 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1566 if (!sysfs_initialized)
1569 pci_remove_capabilities_sysfs(pdev);
1571 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
1572 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1574 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1576 pci_remove_resource_files(pdev);
1578 if (pdev->rom_attr) {
1579 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1580 kfree(pdev->rom_attr);
1581 pdev->rom_attr = NULL;
1584 pci_remove_firmware_label_files(pdev);
1587 static int __init pci_sysfs_init(void)
1589 struct pci_dev *pdev = NULL;
1592 sysfs_initialized = 1;
1593 for_each_pci_dev(pdev) {
1594 retval = pci_create_sysfs_dev_files(pdev);
1603 late_initcall(pci_sysfs_init);
1605 static struct attribute *pci_dev_dev_attrs[] = {
1610 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1611 struct attribute *a, int n)
1613 struct device *dev = kobj_to_dev(kobj);
1614 struct pci_dev *pdev = to_pci_dev(dev);
1616 if (a == &vga_attr.attr)
1617 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1623 static struct attribute *pci_dev_hp_attrs[] = {
1624 &dev_remove_attr.attr,
1625 &dev_rescan_attr.attr,
1629 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1630 struct attribute *a, int n)
1632 struct device *dev = kobj_to_dev(kobj);
1633 struct pci_dev *pdev = to_pci_dev(dev);
1635 if (pdev->is_virtfn)
1641 static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1642 struct attribute *a, int n)
1644 struct device *dev = kobj_to_dev(kobj);
1645 struct pci_dev *pdev = to_pci_dev(dev);
1647 if (pci_is_bridge(pdev))
1653 static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1654 struct attribute *a, int n)
1656 struct device *dev = kobj_to_dev(kobj);
1657 struct pci_dev *pdev = to_pci_dev(dev);
1659 if (pci_is_pcie(pdev))
1665 static const struct attribute_group pci_dev_group = {
1666 .attrs = pci_dev_attrs,
1669 const struct attribute_group *pci_dev_groups[] = {
1674 static const struct attribute_group pci_bridge_group = {
1675 .attrs = pci_bridge_attrs,
1678 const struct attribute_group *pci_bridge_groups[] = {
1683 static const struct attribute_group pcie_dev_group = {
1684 .attrs = pcie_dev_attrs,
1687 const struct attribute_group *pcie_dev_groups[] = {
1692 static const struct attribute_group pci_dev_hp_attr_group = {
1693 .attrs = pci_dev_hp_attrs,
1694 .is_visible = pci_dev_hp_attrs_are_visible,
1697 #ifdef CONFIG_PCI_IOV
1698 static struct attribute *sriov_dev_attrs[] = {
1699 &sriov_totalvfs_attr.attr,
1700 &sriov_numvfs_attr.attr,
1701 &sriov_offset_attr.attr,
1702 &sriov_stride_attr.attr,
1703 &sriov_vf_device_attr.attr,
1704 &sriov_drivers_autoprobe_attr.attr,
1708 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1709 struct attribute *a, int n)
1711 struct device *dev = kobj_to_dev(kobj);
1713 if (!dev_is_pf(dev))
1719 static const struct attribute_group sriov_dev_attr_group = {
1720 .attrs = sriov_dev_attrs,
1721 .is_visible = sriov_attrs_are_visible,
1723 #endif /* CONFIG_PCI_IOV */
1725 static const struct attribute_group pci_dev_attr_group = {
1726 .attrs = pci_dev_dev_attrs,
1727 .is_visible = pci_dev_attrs_are_visible,
1730 static const struct attribute_group pci_bridge_attr_group = {
1731 .attrs = pci_bridge_attrs,
1732 .is_visible = pci_bridge_attrs_are_visible,
1735 static const struct attribute_group pcie_dev_attr_group = {
1736 .attrs = pcie_dev_attrs,
1737 .is_visible = pcie_dev_attrs_are_visible,
1740 static const struct attribute_group *pci_dev_attr_groups[] = {
1741 &pci_dev_attr_group,
1742 &pci_dev_hp_attr_group,
1743 #ifdef CONFIG_PCI_IOV
1744 &sriov_dev_attr_group,
1746 &pci_bridge_attr_group,
1747 &pcie_dev_attr_group,
1748 #ifdef CONFIG_PCIEAER
1749 &aer_stats_attr_group,
1754 const struct device_type pci_dev_type = {
1755 .groups = pci_dev_attr_groups,