1 // SPDX-License-Identifier: GPL-2.0
3 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
4 * (C) Copyright 2002-2004 IBM Corp.
5 * (C) Copyright 2003 Matthew Wilcox
6 * (C) Copyright 2003 Hewlett-Packard
7 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
8 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
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>
29 #include <linux/msi.h>
31 #include <linux/aperture.h>
34 static int sysfs_initialized; /* = 0 */
36 /* show configuration fields */
37 #define pci_config_attr(field, format_string) \
39 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
41 struct pci_dev *pdev; \
43 pdev = to_pci_dev(dev); \
44 return sysfs_emit(buf, format_string, pdev->field); \
46 static DEVICE_ATTR_RO(field)
48 pci_config_attr(vendor, "0x%04x\n");
49 pci_config_attr(device, "0x%04x\n");
50 pci_config_attr(subsystem_vendor, "0x%04x\n");
51 pci_config_attr(subsystem_device, "0x%04x\n");
52 pci_config_attr(revision, "0x%02x\n");
53 pci_config_attr(class, "0x%06x\n");
55 static ssize_t irq_show(struct device *dev,
56 struct device_attribute *attr,
59 struct pci_dev *pdev = to_pci_dev(dev);
63 * For MSI, show the first MSI IRQ; for all other cases including
64 * MSI-X, show the legacy INTx IRQ.
66 if (pdev->msi_enabled)
67 return sysfs_emit(buf, "%u\n", pci_irq_vector(pdev, 0));
70 return sysfs_emit(buf, "%u\n", pdev->irq);
72 static DEVICE_ATTR_RO(irq);
74 static ssize_t broken_parity_status_show(struct device *dev,
75 struct device_attribute *attr,
78 struct pci_dev *pdev = to_pci_dev(dev);
79 return sysfs_emit(buf, "%u\n", pdev->broken_parity_status);
82 static ssize_t broken_parity_status_store(struct device *dev,
83 struct device_attribute *attr,
84 const char *buf, size_t count)
86 struct pci_dev *pdev = to_pci_dev(dev);
89 if (kstrtoul(buf, 0, &val) < 0)
92 pdev->broken_parity_status = !!val;
96 static DEVICE_ATTR_RW(broken_parity_status);
98 static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
99 struct device_attribute *attr, char *buf)
101 const struct cpumask *mask;
104 if (dev_to_node(dev) == NUMA_NO_NODE)
105 mask = cpu_online_mask;
107 mask = cpumask_of_node(dev_to_node(dev));
109 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
111 return cpumap_print_to_pagebuf(list, buf, mask);
114 static ssize_t local_cpus_show(struct device *dev,
115 struct device_attribute *attr, char *buf)
117 return pci_dev_show_local_cpu(dev, false, attr, buf);
119 static DEVICE_ATTR_RO(local_cpus);
121 static ssize_t local_cpulist_show(struct device *dev,
122 struct device_attribute *attr, char *buf)
124 return pci_dev_show_local_cpu(dev, true, attr, buf);
126 static DEVICE_ATTR_RO(local_cpulist);
129 * PCI Bus Class Devices
131 static ssize_t cpuaffinity_show(struct device *dev,
132 struct device_attribute *attr, char *buf)
134 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
136 return cpumap_print_to_pagebuf(false, buf, cpumask);
138 static DEVICE_ATTR_RO(cpuaffinity);
140 static ssize_t cpulistaffinity_show(struct device *dev,
141 struct device_attribute *attr, char *buf)
143 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
145 return cpumap_print_to_pagebuf(true, buf, cpumask);
147 static DEVICE_ATTR_RO(cpulistaffinity);
149 static ssize_t power_state_show(struct device *dev,
150 struct device_attribute *attr, char *buf)
152 struct pci_dev *pdev = to_pci_dev(dev);
154 return sysfs_emit(buf, "%s\n", pci_power_name(pdev->current_state));
156 static DEVICE_ATTR_RO(power_state);
159 static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
162 struct pci_dev *pci_dev = to_pci_dev(dev);
165 resource_size_t start, end;
168 if (pci_dev->subordinate)
169 max = DEVICE_COUNT_RESOURCE;
171 max = PCI_BRIDGE_RESOURCES;
173 for (i = 0; i < max; i++) {
174 struct resource *res = &pci_dev->resource[i];
175 pci_resource_to_user(pci_dev, i, res, &start, &end);
176 len += sysfs_emit_at(buf, len, "0x%016llx 0x%016llx 0x%016llx\n",
177 (unsigned long long)start,
178 (unsigned long long)end,
179 (unsigned long long)res->flags);
183 static DEVICE_ATTR_RO(resource);
185 static ssize_t max_link_speed_show(struct device *dev,
186 struct device_attribute *attr, char *buf)
188 struct pci_dev *pdev = to_pci_dev(dev);
190 return sysfs_emit(buf, "%s\n",
191 pci_speed_string(pcie_get_speed_cap(pdev)));
193 static DEVICE_ATTR_RO(max_link_speed);
195 static ssize_t max_link_width_show(struct device *dev,
196 struct device_attribute *attr, char *buf)
198 struct pci_dev *pdev = to_pci_dev(dev);
200 return sysfs_emit(buf, "%u\n", pcie_get_width_cap(pdev));
202 static DEVICE_ATTR_RO(max_link_width);
204 static ssize_t current_link_speed_show(struct device *dev,
205 struct device_attribute *attr, char *buf)
207 struct pci_dev *pci_dev = to_pci_dev(dev);
210 enum pci_bus_speed speed;
212 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
216 speed = pcie_link_speed[linkstat & PCI_EXP_LNKSTA_CLS];
218 return sysfs_emit(buf, "%s\n", pci_speed_string(speed));
220 static DEVICE_ATTR_RO(current_link_speed);
222 static ssize_t current_link_width_show(struct device *dev,
223 struct device_attribute *attr, char *buf)
225 struct pci_dev *pci_dev = to_pci_dev(dev);
229 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
233 return sysfs_emit(buf, "%u\n",
234 (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
236 static DEVICE_ATTR_RO(current_link_width);
238 static ssize_t secondary_bus_number_show(struct device *dev,
239 struct device_attribute *attr,
242 struct pci_dev *pci_dev = to_pci_dev(dev);
246 err = pci_read_config_byte(pci_dev, PCI_SECONDARY_BUS, &sec_bus);
250 return sysfs_emit(buf, "%u\n", sec_bus);
252 static DEVICE_ATTR_RO(secondary_bus_number);
254 static ssize_t subordinate_bus_number_show(struct device *dev,
255 struct device_attribute *attr,
258 struct pci_dev *pci_dev = to_pci_dev(dev);
262 err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
266 return sysfs_emit(buf, "%u\n", sub_bus);
268 static DEVICE_ATTR_RO(subordinate_bus_number);
270 static ssize_t ari_enabled_show(struct device *dev,
271 struct device_attribute *attr,
274 struct pci_dev *pci_dev = to_pci_dev(dev);
276 return sysfs_emit(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
278 static DEVICE_ATTR_RO(ari_enabled);
280 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
283 struct pci_dev *pci_dev = to_pci_dev(dev);
285 return sysfs_emit(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
286 pci_dev->vendor, pci_dev->device,
287 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
288 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
289 (u8)(pci_dev->class));
291 static DEVICE_ATTR_RO(modalias);
293 static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
294 const char *buf, size_t count)
296 struct pci_dev *pdev = to_pci_dev(dev);
300 /* this can crash the machine when done on the "wrong" device */
301 if (!capable(CAP_SYS_ADMIN))
304 if (kstrtoul(buf, 0, &val) < 0)
311 result = pci_enable_device(pdev);
312 else if (pci_is_enabled(pdev))
313 pci_disable_device(pdev);
318 return result < 0 ? result : count;
321 static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
324 struct pci_dev *pdev;
326 pdev = to_pci_dev(dev);
327 return sysfs_emit(buf, "%u\n", atomic_read(&pdev->enable_cnt));
329 static DEVICE_ATTR_RW(enable);
332 static ssize_t numa_node_store(struct device *dev,
333 struct device_attribute *attr, const char *buf,
336 struct pci_dev *pdev = to_pci_dev(dev);
339 if (!capable(CAP_SYS_ADMIN))
342 if (kstrtoint(buf, 0, &node) < 0)
345 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
348 if (node != NUMA_NO_NODE && !node_online(node))
351 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
352 pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
355 dev->numa_node = node;
359 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
362 return sysfs_emit(buf, "%d\n", dev->numa_node);
364 static DEVICE_ATTR_RW(numa_node);
367 static ssize_t dma_mask_bits_show(struct device *dev,
368 struct device_attribute *attr, char *buf)
370 struct pci_dev *pdev = to_pci_dev(dev);
372 return sysfs_emit(buf, "%d\n", fls64(pdev->dma_mask));
374 static DEVICE_ATTR_RO(dma_mask_bits);
376 static ssize_t consistent_dma_mask_bits_show(struct device *dev,
377 struct device_attribute *attr,
380 return sysfs_emit(buf, "%d\n", fls64(dev->coherent_dma_mask));
382 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
384 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
387 struct pci_dev *pdev = to_pci_dev(dev);
388 struct pci_bus *subordinate = pdev->subordinate;
390 return sysfs_emit(buf, "%u\n", subordinate ?
391 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
395 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
396 const char *buf, size_t count)
398 struct pci_dev *pdev = to_pci_dev(dev);
399 struct pci_bus *subordinate = pdev->subordinate;
402 if (!capable(CAP_SYS_ADMIN))
405 if (kstrtoul(buf, 0, &val) < 0)
409 * "no_msi" and "bus_flags" only affect what happens when a driver
410 * requests MSI or MSI-X. They don't affect any drivers that have
411 * already requested MSI or MSI-X.
415 pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
416 val ? "allowed" : "disallowed");
421 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
423 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
425 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
426 val ? "allowed" : "disallowed");
429 static DEVICE_ATTR_RW(msi_bus);
431 static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count)
434 struct pci_bus *b = NULL;
436 if (kstrtoul(buf, 0, &val) < 0)
440 pci_lock_rescan_remove();
441 while ((b = pci_find_next_bus(b)) != NULL)
443 pci_unlock_rescan_remove();
447 static BUS_ATTR_WO(rescan);
449 static struct attribute *pci_bus_attrs[] = {
450 &bus_attr_rescan.attr,
454 static const struct attribute_group pci_bus_group = {
455 .attrs = pci_bus_attrs,
458 const struct attribute_group *pci_bus_groups[] = {
463 static ssize_t dev_rescan_store(struct device *dev,
464 struct device_attribute *attr, const char *buf,
468 struct pci_dev *pdev = to_pci_dev(dev);
470 if (kstrtoul(buf, 0, &val) < 0)
474 pci_lock_rescan_remove();
475 pci_rescan_bus(pdev->bus);
476 pci_unlock_rescan_remove();
480 static struct device_attribute dev_attr_dev_rescan = __ATTR(rescan, 0200, NULL,
483 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
484 const char *buf, size_t count)
488 if (kstrtoul(buf, 0, &val) < 0)
491 if (val && device_remove_file_self(dev, attr))
492 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
495 static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0220, NULL,
498 static ssize_t bus_rescan_store(struct device *dev,
499 struct device_attribute *attr,
500 const char *buf, size_t count)
503 struct pci_bus *bus = to_pci_bus(dev);
505 if (kstrtoul(buf, 0, &val) < 0)
509 pci_lock_rescan_remove();
510 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
511 pci_rescan_bus_bridge_resize(bus->self);
514 pci_unlock_rescan_remove();
518 static struct device_attribute dev_attr_bus_rescan = __ATTR(rescan, 0200, NULL,
521 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
522 static ssize_t d3cold_allowed_store(struct device *dev,
523 struct device_attribute *attr,
524 const char *buf, size_t count)
526 struct pci_dev *pdev = to_pci_dev(dev);
529 if (kstrtoul(buf, 0, &val) < 0)
532 pdev->d3cold_allowed = !!val;
533 if (pdev->d3cold_allowed)
534 pci_d3cold_enable(pdev);
536 pci_d3cold_disable(pdev);
538 pm_runtime_resume(dev);
543 static ssize_t d3cold_allowed_show(struct device *dev,
544 struct device_attribute *attr, char *buf)
546 struct pci_dev *pdev = to_pci_dev(dev);
547 return sysfs_emit(buf, "%u\n", pdev->d3cold_allowed);
549 static DEVICE_ATTR_RW(d3cold_allowed);
553 static ssize_t devspec_show(struct device *dev,
554 struct device_attribute *attr, char *buf)
556 struct pci_dev *pdev = to_pci_dev(dev);
557 struct device_node *np = pci_device_to_OF_node(pdev);
561 return sysfs_emit(buf, "%pOF\n", np);
563 static DEVICE_ATTR_RO(devspec);
566 static ssize_t driver_override_store(struct device *dev,
567 struct device_attribute *attr,
568 const char *buf, size_t count)
570 struct pci_dev *pdev = to_pci_dev(dev);
573 ret = driver_set_override(dev, &pdev->driver_override, buf, count);
580 static ssize_t driver_override_show(struct device *dev,
581 struct device_attribute *attr, char *buf)
583 struct pci_dev *pdev = to_pci_dev(dev);
587 len = sysfs_emit(buf, "%s\n", pdev->driver_override);
591 static DEVICE_ATTR_RW(driver_override);
593 static struct attribute *pci_dev_attrs[] = {
594 &dev_attr_power_state.attr,
595 &dev_attr_resource.attr,
596 &dev_attr_vendor.attr,
597 &dev_attr_device.attr,
598 &dev_attr_subsystem_vendor.attr,
599 &dev_attr_subsystem_device.attr,
600 &dev_attr_revision.attr,
601 &dev_attr_class.attr,
603 &dev_attr_local_cpus.attr,
604 &dev_attr_local_cpulist.attr,
605 &dev_attr_modalias.attr,
607 &dev_attr_numa_node.attr,
609 &dev_attr_dma_mask_bits.attr,
610 &dev_attr_consistent_dma_mask_bits.attr,
611 &dev_attr_enable.attr,
612 &dev_attr_broken_parity_status.attr,
613 &dev_attr_msi_bus.attr,
614 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
615 &dev_attr_d3cold_allowed.attr,
618 &dev_attr_devspec.attr,
620 &dev_attr_driver_override.attr,
621 &dev_attr_ari_enabled.attr,
625 static struct attribute *pci_bridge_attrs[] = {
626 &dev_attr_subordinate_bus_number.attr,
627 &dev_attr_secondary_bus_number.attr,
631 static struct attribute *pcie_dev_attrs[] = {
632 &dev_attr_current_link_speed.attr,
633 &dev_attr_current_link_width.attr,
634 &dev_attr_max_link_width.attr,
635 &dev_attr_max_link_speed.attr,
639 static struct attribute *pcibus_attrs[] = {
640 &dev_attr_bus_rescan.attr,
641 &dev_attr_cpuaffinity.attr,
642 &dev_attr_cpulistaffinity.attr,
646 static const struct attribute_group pcibus_group = {
647 .attrs = pcibus_attrs,
650 const struct attribute_group *pcibus_groups[] = {
655 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
658 struct pci_dev *pdev = to_pci_dev(dev);
659 struct pci_dev *vga_dev = vga_default_device();
662 return sysfs_emit(buf, "%u\n", (pdev == vga_dev));
664 return sysfs_emit(buf, "%u\n",
665 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
666 IORESOURCE_ROM_SHADOW));
668 static DEVICE_ATTR_RO(boot_vga);
670 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
671 struct bin_attribute *bin_attr, char *buf,
672 loff_t off, size_t count)
674 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
675 unsigned int size = 64;
676 loff_t init_off = off;
677 u8 *data = (u8 *) buf;
679 /* Several chips lock up trying to read undefined config space */
680 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
681 size = dev->cfg_size;
682 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
687 if (off + count > size) {
694 pci_config_pm_runtime_get(dev);
696 if ((off & 1) && size) {
698 pci_user_read_config_byte(dev, off, &val);
699 data[off - init_off] = val;
704 if ((off & 3) && size > 2) {
706 pci_user_read_config_word(dev, off, &val);
707 data[off - init_off] = val & 0xff;
708 data[off - init_off + 1] = (val >> 8) & 0xff;
715 pci_user_read_config_dword(dev, off, &val);
716 data[off - init_off] = val & 0xff;
717 data[off - init_off + 1] = (val >> 8) & 0xff;
718 data[off - init_off + 2] = (val >> 16) & 0xff;
719 data[off - init_off + 3] = (val >> 24) & 0xff;
727 pci_user_read_config_word(dev, off, &val);
728 data[off - init_off] = val & 0xff;
729 data[off - init_off + 1] = (val >> 8) & 0xff;
736 pci_user_read_config_byte(dev, off, &val);
737 data[off - init_off] = val;
740 pci_config_pm_runtime_put(dev);
745 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
746 struct bin_attribute *bin_attr, char *buf,
747 loff_t off, size_t count)
749 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
750 unsigned int size = count;
751 loff_t init_off = off;
752 u8 *data = (u8 *) buf;
755 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
759 if (resource_is_exclusive(&dev->driver_exclusive_resource, off,
761 pci_warn_once(dev, "%s: Unexpected write to kernel-exclusive config offset %llx",
763 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
766 if (off > dev->cfg_size)
768 if (off + count > dev->cfg_size) {
769 size = dev->cfg_size - off;
773 pci_config_pm_runtime_get(dev);
775 if ((off & 1) && size) {
776 pci_user_write_config_byte(dev, off, data[off - init_off]);
781 if ((off & 3) && size > 2) {
782 u16 val = data[off - init_off];
783 val |= (u16) data[off - init_off + 1] << 8;
784 pci_user_write_config_word(dev, off, val);
790 u32 val = data[off - init_off];
791 val |= (u32) data[off - init_off + 1] << 8;
792 val |= (u32) data[off - init_off + 2] << 16;
793 val |= (u32) data[off - init_off + 3] << 24;
794 pci_user_write_config_dword(dev, off, val);
800 u16 val = data[off - init_off];
801 val |= (u16) data[off - init_off + 1] << 8;
802 pci_user_write_config_word(dev, off, val);
808 pci_user_write_config_byte(dev, off, data[off - init_off]);
810 pci_config_pm_runtime_put(dev);
814 static BIN_ATTR(config, 0644, pci_read_config, pci_write_config, 0);
816 static struct bin_attribute *pci_dev_config_attrs[] = {
821 static umode_t pci_dev_config_attr_is_visible(struct kobject *kobj,
822 struct bin_attribute *a, int n)
824 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
826 a->size = PCI_CFG_SPACE_SIZE;
827 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
828 a->size = PCI_CFG_SPACE_EXP_SIZE;
833 static const struct attribute_group pci_dev_config_attr_group = {
834 .bin_attrs = pci_dev_config_attrs,
835 .is_bin_visible = pci_dev_config_attr_is_visible,
838 #ifdef HAVE_PCI_LEGACY
840 * pci_read_legacy_io - read byte(s) from legacy I/O port space
841 * @filp: open sysfs file
842 * @kobj: kobject corresponding to file to read from
843 * @bin_attr: struct bin_attribute for this file
844 * @buf: buffer to store results
845 * @off: offset into legacy I/O port space
846 * @count: number of bytes to read
848 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
849 * callback routine (pci_legacy_read).
851 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
852 struct bin_attribute *bin_attr, char *buf,
853 loff_t off, size_t count)
855 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
857 /* Only support 1, 2 or 4 byte accesses */
858 if (count != 1 && count != 2 && count != 4)
861 return pci_legacy_read(bus, off, (u32 *)buf, count);
865 * pci_write_legacy_io - write byte(s) to legacy I/O port space
866 * @filp: open sysfs file
867 * @kobj: kobject corresponding to file to read from
868 * @bin_attr: struct bin_attribute for this file
869 * @buf: buffer containing value to be written
870 * @off: offset into legacy I/O port space
871 * @count: number of bytes to write
873 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
874 * callback routine (pci_legacy_write).
876 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
877 struct bin_attribute *bin_attr, char *buf,
878 loff_t off, size_t count)
880 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
882 /* Only support 1, 2 or 4 byte accesses */
883 if (count != 1 && count != 2 && count != 4)
886 return pci_legacy_write(bus, off, *(u32 *)buf, count);
890 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
891 * @filp: open sysfs file
892 * @kobj: kobject corresponding to device to be mapped
893 * @attr: struct bin_attribute for this file
894 * @vma: struct vm_area_struct passed to mmap
896 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
897 * legacy memory space (first meg of bus space) into application virtual
900 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
901 struct bin_attribute *attr,
902 struct vm_area_struct *vma)
904 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
906 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
910 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
911 * @filp: open sysfs file
912 * @kobj: kobject corresponding to device to be mapped
913 * @attr: struct bin_attribute for this file
914 * @vma: struct vm_area_struct passed to mmap
916 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
917 * legacy IO space (first meg of bus space) into application virtual
918 * memory space. Returns -ENOSYS if the operation isn't supported
920 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
921 struct bin_attribute *attr,
922 struct vm_area_struct *vma)
924 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
926 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
930 * pci_adjust_legacy_attr - adjustment of legacy file attributes
931 * @b: bus to create files under
932 * @mmap_type: I/O port or memory
934 * Stub implementation. Can be overridden by arch if necessary.
936 void __weak pci_adjust_legacy_attr(struct pci_bus *b,
937 enum pci_mmap_state mmap_type)
942 * pci_create_legacy_files - create legacy I/O port and memory files
943 * @b: bus to create files under
945 * Some platforms allow access to legacy I/O port and ISA memory space on
946 * a per-bus basis. This routine creates the files and ties them into
947 * their associated read, write and mmap files from pci-sysfs.c
949 * On error unwind, but don't propagate the error to the caller
950 * as it is ok to set up the PCI bus without these files.
952 void pci_create_legacy_files(struct pci_bus *b)
956 if (!sysfs_initialized)
959 b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
964 sysfs_bin_attr_init(b->legacy_io);
965 b->legacy_io->attr.name = "legacy_io";
966 b->legacy_io->size = 0xffff;
967 b->legacy_io->attr.mode = 0600;
968 b->legacy_io->read = pci_read_legacy_io;
969 b->legacy_io->write = pci_write_legacy_io;
970 b->legacy_io->mmap = pci_mmap_legacy_io;
971 b->legacy_io->f_mapping = iomem_get_mapping;
972 pci_adjust_legacy_attr(b, pci_mmap_io);
973 error = device_create_bin_file(&b->dev, b->legacy_io);
977 /* Allocated above after the legacy_io struct */
978 b->legacy_mem = b->legacy_io + 1;
979 sysfs_bin_attr_init(b->legacy_mem);
980 b->legacy_mem->attr.name = "legacy_mem";
981 b->legacy_mem->size = 1024*1024;
982 b->legacy_mem->attr.mode = 0600;
983 b->legacy_mem->mmap = pci_mmap_legacy_mem;
984 b->legacy_mem->f_mapping = iomem_get_mapping;
985 pci_adjust_legacy_attr(b, pci_mmap_mem);
986 error = device_create_bin_file(&b->dev, b->legacy_mem);
993 device_remove_bin_file(&b->dev, b->legacy_io);
998 dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n");
1001 void pci_remove_legacy_files(struct pci_bus *b)
1004 device_remove_bin_file(&b->dev, b->legacy_io);
1005 device_remove_bin_file(&b->dev, b->legacy_mem);
1006 kfree(b->legacy_io); /* both are allocated here */
1009 #endif /* HAVE_PCI_LEGACY */
1011 #if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
1013 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
1014 enum pci_mmap_api mmap_api)
1016 unsigned long nr, start, size;
1017 resource_size_t pci_start = 0, pci_end;
1019 if (pci_resource_len(pdev, resno) == 0)
1021 nr = vma_pages(vma);
1022 start = vma->vm_pgoff;
1023 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
1024 if (mmap_api == PCI_MMAP_PROCFS) {
1025 pci_resource_to_user(pdev, resno, &pdev->resource[resno],
1026 &pci_start, &pci_end);
1027 pci_start >>= PAGE_SHIFT;
1029 if (start >= pci_start && start < pci_start + size &&
1030 start + nr <= pci_start + size)
1036 * pci_mmap_resource - map a PCI resource into user memory space
1037 * @kobj: kobject for mapping
1038 * @attr: struct bin_attribute for the file being mapped
1039 * @vma: struct vm_area_struct passed into the mmap
1040 * @write_combine: 1 for write_combine mapping
1042 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1044 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1045 struct vm_area_struct *vma, int write_combine)
1047 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1048 int bar = (unsigned long)attr->private;
1049 enum pci_mmap_state mmap_type;
1050 struct resource *res = &pdev->resource[bar];
1053 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1057 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1060 if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1063 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1065 return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1068 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1069 struct bin_attribute *attr,
1070 struct vm_area_struct *vma)
1072 return pci_mmap_resource(kobj, attr, vma, 0);
1075 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1076 struct bin_attribute *attr,
1077 struct vm_area_struct *vma)
1079 return pci_mmap_resource(kobj, attr, vma, 1);
1082 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1083 struct bin_attribute *attr, char *buf,
1084 loff_t off, size_t count, bool write)
1086 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1087 int bar = (unsigned long)attr->private;
1088 unsigned long port = off;
1090 port += pci_resource_start(pdev, bar);
1092 if (port > pci_resource_end(pdev, bar))
1095 if (port + count - 1 > pci_resource_end(pdev, bar))
1101 outb(*(u8 *)buf, port);
1103 *(u8 *)buf = inb(port);
1107 outw(*(u16 *)buf, port);
1109 *(u16 *)buf = inw(port);
1113 outl(*(u32 *)buf, port);
1115 *(u32 *)buf = inl(port);
1121 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1122 struct bin_attribute *attr, char *buf,
1123 loff_t off, size_t count)
1125 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1128 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1129 struct bin_attribute *attr, char *buf,
1130 loff_t off, size_t count)
1134 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1138 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1142 * pci_remove_resource_files - cleanup resource files
1143 * @pdev: dev to cleanup
1145 * If we created resource files for @pdev, remove them from sysfs and
1146 * free their resources.
1148 static void pci_remove_resource_files(struct pci_dev *pdev)
1152 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1153 struct bin_attribute *res_attr;
1155 res_attr = pdev->res_attr[i];
1157 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1161 res_attr = pdev->res_attr_wc[i];
1163 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1169 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1171 /* allocate attribute structure, piggyback attribute name */
1172 int name_len = write_combine ? 13 : 10;
1173 struct bin_attribute *res_attr;
1174 char *res_attr_name;
1177 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1181 res_attr_name = (char *)(res_attr + 1);
1183 sysfs_bin_attr_init(res_attr);
1184 if (write_combine) {
1185 sprintf(res_attr_name, "resource%d_wc", num);
1186 res_attr->mmap = pci_mmap_resource_wc;
1188 sprintf(res_attr_name, "resource%d", num);
1189 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1190 res_attr->read = pci_read_resource_io;
1191 res_attr->write = pci_write_resource_io;
1192 if (arch_can_pci_mmap_io())
1193 res_attr->mmap = pci_mmap_resource_uc;
1195 res_attr->mmap = pci_mmap_resource_uc;
1199 res_attr->f_mapping = iomem_get_mapping;
1200 res_attr->attr.name = res_attr_name;
1201 res_attr->attr.mode = 0600;
1202 res_attr->size = pci_resource_len(pdev, num);
1203 res_attr->private = (void *)(unsigned long)num;
1204 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1211 pdev->res_attr_wc[num] = res_attr;
1213 pdev->res_attr[num] = res_attr;
1219 * pci_create_resource_files - create resource files in sysfs for @dev
1220 * @pdev: dev in question
1222 * Walk the resources in @pdev creating files for each resource available.
1224 static int pci_create_resource_files(struct pci_dev *pdev)
1229 /* Expose the PCI resources from this device as files */
1230 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1232 /* skip empty resources */
1233 if (!pci_resource_len(pdev, i))
1236 retval = pci_create_attr(pdev, i, 0);
1237 /* for prefetchable resources, create a WC mappable file */
1238 if (!retval && arch_can_pci_mmap_wc() &&
1239 pdev->resource[i].flags & IORESOURCE_PREFETCH)
1240 retval = pci_create_attr(pdev, i, 1);
1242 pci_remove_resource_files(pdev);
1248 #else /* !(defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)) */
1249 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1250 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1254 * pci_write_rom - used to enable access to the PCI ROM display
1256 * @kobj: kernel object handle
1257 * @bin_attr: struct bin_attribute for this file
1260 * @count: number of byte in input
1262 * writing anything except 0 enables it
1264 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1265 struct bin_attribute *bin_attr, char *buf,
1266 loff_t off, size_t count)
1268 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1270 if ((off == 0) && (*buf == '0') && (count == 2))
1271 pdev->rom_attr_enabled = 0;
1273 pdev->rom_attr_enabled = 1;
1279 * pci_read_rom - read a PCI ROM
1281 * @kobj: kernel object handle
1282 * @bin_attr: struct bin_attribute for this file
1283 * @buf: where to put the data we read from the ROM
1285 * @count: number of bytes to read
1287 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1288 * device corresponding to @kobj.
1290 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1291 struct bin_attribute *bin_attr, char *buf,
1292 loff_t off, size_t count)
1294 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1298 if (!pdev->rom_attr_enabled)
1301 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1308 if (off + count > size)
1311 memcpy_fromio(buf, rom + off, count);
1313 pci_unmap_rom(pdev, rom);
1317 static BIN_ATTR(rom, 0600, pci_read_rom, pci_write_rom, 0);
1319 static struct bin_attribute *pci_dev_rom_attrs[] = {
1324 static umode_t pci_dev_rom_attr_is_visible(struct kobject *kobj,
1325 struct bin_attribute *a, int n)
1327 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1330 /* If the device has a ROM, try to expose it in sysfs. */
1331 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1337 return a->attr.mode;
1340 static const struct attribute_group pci_dev_rom_attr_group = {
1341 .bin_attrs = pci_dev_rom_attrs,
1342 .is_bin_visible = pci_dev_rom_attr_is_visible,
1345 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1346 const char *buf, size_t count)
1348 struct pci_dev *pdev = to_pci_dev(dev);
1352 if (kstrtoul(buf, 0, &val) < 0)
1358 pm_runtime_get_sync(dev);
1359 result = pci_reset_function(pdev);
1360 pm_runtime_put(dev);
1366 static DEVICE_ATTR_WO(reset);
1368 static struct attribute *pci_dev_reset_attrs[] = {
1369 &dev_attr_reset.attr,
1373 static umode_t pci_dev_reset_attr_is_visible(struct kobject *kobj,
1374 struct attribute *a, int n)
1376 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1378 if (!pci_reset_supported(pdev))
1384 static const struct attribute_group pci_dev_reset_attr_group = {
1385 .attrs = pci_dev_reset_attrs,
1386 .is_visible = pci_dev_reset_attr_is_visible,
1389 #define pci_dev_resource_resize_attr(n) \
1390 static ssize_t resource##n##_resize_show(struct device *dev, \
1391 struct device_attribute *attr, \
1394 struct pci_dev *pdev = to_pci_dev(dev); \
1397 pci_config_pm_runtime_get(pdev); \
1399 ret = sysfs_emit(buf, "%016llx\n", \
1400 (u64)pci_rebar_get_possible_sizes(pdev, n)); \
1402 pci_config_pm_runtime_put(pdev); \
1407 static ssize_t resource##n##_resize_store(struct device *dev, \
1408 struct device_attribute *attr,\
1409 const char *buf, size_t count)\
1411 struct pci_dev *pdev = to_pci_dev(dev); \
1412 unsigned long size, flags; \
1416 if (kstrtoul(buf, 0, &size) < 0) \
1420 if (dev->driver) { \
1425 pci_config_pm_runtime_get(pdev); \
1427 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) { \
1428 ret = aperture_remove_conflicting_pci_devices(pdev, \
1429 "resourceN_resize"); \
1434 pci_read_config_word(pdev, PCI_COMMAND, &cmd); \
1435 pci_write_config_word(pdev, PCI_COMMAND, \
1436 cmd & ~PCI_COMMAND_MEMORY); \
1438 flags = pci_resource_flags(pdev, n); \
1440 pci_remove_resource_files(pdev); \
1442 for (i = 0; i < PCI_STD_NUM_BARS; i++) { \
1443 if (pci_resource_len(pdev, i) && \
1444 pci_resource_flags(pdev, i) == flags) \
1445 pci_release_resource(pdev, i); \
1448 ret = pci_resize_resource(pdev, n, size); \
1450 pci_assign_unassigned_bus_resources(pdev->bus); \
1452 if (pci_create_resource_files(pdev)) \
1453 pci_warn(pdev, "Failed to recreate resource files after BAR resizing\n");\
1455 pci_write_config_word(pdev, PCI_COMMAND, cmd); \
1457 pci_config_pm_runtime_put(pdev); \
1459 device_unlock(dev); \
1461 return ret ? ret : count; \
1463 static DEVICE_ATTR_RW(resource##n##_resize)
1465 pci_dev_resource_resize_attr(0);
1466 pci_dev_resource_resize_attr(1);
1467 pci_dev_resource_resize_attr(2);
1468 pci_dev_resource_resize_attr(3);
1469 pci_dev_resource_resize_attr(4);
1470 pci_dev_resource_resize_attr(5);
1472 static struct attribute *resource_resize_attrs[] = {
1473 &dev_attr_resource0_resize.attr,
1474 &dev_attr_resource1_resize.attr,
1475 &dev_attr_resource2_resize.attr,
1476 &dev_attr_resource3_resize.attr,
1477 &dev_attr_resource4_resize.attr,
1478 &dev_attr_resource5_resize.attr,
1482 static umode_t resource_resize_is_visible(struct kobject *kobj,
1483 struct attribute *a, int n)
1485 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1487 return pci_rebar_get_current_size(pdev, n) < 0 ? 0 : a->mode;
1490 static const struct attribute_group pci_dev_resource_resize_group = {
1491 .attrs = resource_resize_attrs,
1492 .is_visible = resource_resize_is_visible,
1495 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1497 if (!sysfs_initialized)
1500 return pci_create_resource_files(pdev);
1504 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1505 * @pdev: device whose entries we should free
1507 * Cleanup when @pdev is removed from sysfs.
1509 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1511 if (!sysfs_initialized)
1514 pci_remove_resource_files(pdev);
1517 static int __init pci_sysfs_init(void)
1519 struct pci_dev *pdev = NULL;
1520 struct pci_bus *pbus = NULL;
1523 sysfs_initialized = 1;
1524 for_each_pci_dev(pdev) {
1525 retval = pci_create_sysfs_dev_files(pdev);
1532 while ((pbus = pci_find_next_bus(pbus)))
1533 pci_create_legacy_files(pbus);
1537 late_initcall(pci_sysfs_init);
1539 static struct attribute *pci_dev_dev_attrs[] = {
1540 &dev_attr_boot_vga.attr,
1544 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1545 struct attribute *a, int n)
1547 struct device *dev = kobj_to_dev(kobj);
1548 struct pci_dev *pdev = to_pci_dev(dev);
1550 if (a == &dev_attr_boot_vga.attr)
1551 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1557 static struct attribute *pci_dev_hp_attrs[] = {
1558 &dev_attr_remove.attr,
1559 &dev_attr_dev_rescan.attr,
1563 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1564 struct attribute *a, int n)
1566 struct device *dev = kobj_to_dev(kobj);
1567 struct pci_dev *pdev = to_pci_dev(dev);
1569 if (pdev->is_virtfn)
1575 static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1576 struct attribute *a, int n)
1578 struct device *dev = kobj_to_dev(kobj);
1579 struct pci_dev *pdev = to_pci_dev(dev);
1581 if (pci_is_bridge(pdev))
1587 static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1588 struct attribute *a, int n)
1590 struct device *dev = kobj_to_dev(kobj);
1591 struct pci_dev *pdev = to_pci_dev(dev);
1593 if (pci_is_pcie(pdev))
1599 static const struct attribute_group pci_dev_group = {
1600 .attrs = pci_dev_attrs,
1603 const struct attribute_group *pci_dev_groups[] = {
1605 &pci_dev_config_attr_group,
1606 &pci_dev_rom_attr_group,
1607 &pci_dev_reset_attr_group,
1608 &pci_dev_reset_method_attr_group,
1609 &pci_dev_vpd_attr_group,
1611 &pci_dev_smbios_attr_group,
1614 &pci_dev_acpi_attr_group,
1616 &pci_dev_resource_resize_group,
1620 static const struct attribute_group pci_dev_hp_attr_group = {
1621 .attrs = pci_dev_hp_attrs,
1622 .is_visible = pci_dev_hp_attrs_are_visible,
1625 static const struct attribute_group pci_dev_attr_group = {
1626 .attrs = pci_dev_dev_attrs,
1627 .is_visible = pci_dev_attrs_are_visible,
1630 static const struct attribute_group pci_bridge_attr_group = {
1631 .attrs = pci_bridge_attrs,
1632 .is_visible = pci_bridge_attrs_are_visible,
1635 static const struct attribute_group pcie_dev_attr_group = {
1636 .attrs = pcie_dev_attrs,
1637 .is_visible = pcie_dev_attrs_are_visible,
1640 static const struct attribute_group *pci_dev_attr_groups[] = {
1641 &pci_dev_attr_group,
1642 &pci_dev_hp_attr_group,
1643 #ifdef CONFIG_PCI_IOV
1644 &sriov_pf_dev_attr_group,
1645 &sriov_vf_dev_attr_group,
1647 &pci_bridge_attr_group,
1648 &pcie_dev_attr_group,
1649 #ifdef CONFIG_PCIEAER
1650 &aer_stats_attr_group,
1652 #ifdef CONFIG_PCIEASPM
1653 &aspm_ctrl_attr_group,
1658 const struct device_type pci_dev_type = {
1659 .groups = pci_dev_attr_groups,