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
15 #include <linux/bitfield.h>
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", FIELD_GET(PCI_EXP_LNKSTA_NLW, linkstat));
235 static DEVICE_ATTR_RO(current_link_width);
237 static ssize_t secondary_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_SECONDARY_BUS, &sec_bus);
249 return sysfs_emit(buf, "%u\n", sec_bus);
251 static DEVICE_ATTR_RO(secondary_bus_number);
253 static ssize_t subordinate_bus_number_show(struct device *dev,
254 struct device_attribute *attr,
257 struct pci_dev *pci_dev = to_pci_dev(dev);
261 err = pci_read_config_byte(pci_dev, PCI_SUBORDINATE_BUS, &sub_bus);
265 return sysfs_emit(buf, "%u\n", sub_bus);
267 static DEVICE_ATTR_RO(subordinate_bus_number);
269 static ssize_t ari_enabled_show(struct device *dev,
270 struct device_attribute *attr,
273 struct pci_dev *pci_dev = to_pci_dev(dev);
275 return sysfs_emit(buf, "%u\n", pci_ari_enabled(pci_dev->bus));
277 static DEVICE_ATTR_RO(ari_enabled);
279 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
282 struct pci_dev *pci_dev = to_pci_dev(dev);
284 return sysfs_emit(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
285 pci_dev->vendor, pci_dev->device,
286 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
287 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
288 (u8)(pci_dev->class));
290 static DEVICE_ATTR_RO(modalias);
292 static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
293 const char *buf, size_t count)
295 struct pci_dev *pdev = to_pci_dev(dev);
299 /* this can crash the machine when done on the "wrong" device */
300 if (!capable(CAP_SYS_ADMIN))
303 if (kstrtoul(buf, 0, &val) < 0)
310 result = pci_enable_device(pdev);
311 else if (pci_is_enabled(pdev))
312 pci_disable_device(pdev);
317 return result < 0 ? result : count;
320 static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
323 struct pci_dev *pdev;
325 pdev = to_pci_dev(dev);
326 return sysfs_emit(buf, "%u\n", atomic_read(&pdev->enable_cnt));
328 static DEVICE_ATTR_RW(enable);
331 static ssize_t numa_node_store(struct device *dev,
332 struct device_attribute *attr, const char *buf,
335 struct pci_dev *pdev = to_pci_dev(dev);
338 if (!capable(CAP_SYS_ADMIN))
341 if (kstrtoint(buf, 0, &node) < 0)
344 if ((node < 0 && node != NUMA_NO_NODE) || node >= MAX_NUMNODES)
347 if (node != NUMA_NO_NODE && !node_online(node))
350 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
351 pci_alert(pdev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
354 dev->numa_node = node;
358 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
361 return sysfs_emit(buf, "%d\n", dev->numa_node);
363 static DEVICE_ATTR_RW(numa_node);
366 static ssize_t dma_mask_bits_show(struct device *dev,
367 struct device_attribute *attr, char *buf)
369 struct pci_dev *pdev = to_pci_dev(dev);
371 return sysfs_emit(buf, "%d\n", fls64(pdev->dma_mask));
373 static DEVICE_ATTR_RO(dma_mask_bits);
375 static ssize_t consistent_dma_mask_bits_show(struct device *dev,
376 struct device_attribute *attr,
379 return sysfs_emit(buf, "%d\n", fls64(dev->coherent_dma_mask));
381 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
383 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
386 struct pci_dev *pdev = to_pci_dev(dev);
387 struct pci_bus *subordinate = pdev->subordinate;
389 return sysfs_emit(buf, "%u\n", subordinate ?
390 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
394 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
395 const char *buf, size_t count)
397 struct pci_dev *pdev = to_pci_dev(dev);
398 struct pci_bus *subordinate = pdev->subordinate;
401 if (!capable(CAP_SYS_ADMIN))
404 if (kstrtoul(buf, 0, &val) < 0)
408 * "no_msi" and "bus_flags" only affect what happens when a driver
409 * requests MSI or MSI-X. They don't affect any drivers that have
410 * already requested MSI or MSI-X.
414 pci_info(pdev, "MSI/MSI-X %s for future drivers\n",
415 val ? "allowed" : "disallowed");
420 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
422 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
424 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
425 val ? "allowed" : "disallowed");
428 static DEVICE_ATTR_RW(msi_bus);
430 static ssize_t rescan_store(const struct bus_type *bus, const char *buf, size_t count)
433 struct pci_bus *b = NULL;
435 if (kstrtoul(buf, 0, &val) < 0)
439 pci_lock_rescan_remove();
440 while ((b = pci_find_next_bus(b)) != NULL)
442 pci_unlock_rescan_remove();
446 static BUS_ATTR_WO(rescan);
448 static struct attribute *pci_bus_attrs[] = {
449 &bus_attr_rescan.attr,
453 static const struct attribute_group pci_bus_group = {
454 .attrs = pci_bus_attrs,
457 const struct attribute_group *pci_bus_groups[] = {
462 static ssize_t dev_rescan_store(struct device *dev,
463 struct device_attribute *attr, const char *buf,
467 struct pci_dev *pdev = to_pci_dev(dev);
469 if (kstrtoul(buf, 0, &val) < 0)
473 pci_lock_rescan_remove();
474 pci_rescan_bus(pdev->bus);
475 pci_unlock_rescan_remove();
479 static struct device_attribute dev_attr_dev_rescan = __ATTR(rescan, 0200, NULL,
482 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
483 const char *buf, size_t count)
487 if (kstrtoul(buf, 0, &val) < 0)
490 if (val && device_remove_file_self(dev, attr))
491 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
494 static DEVICE_ATTR_IGNORE_LOCKDEP(remove, 0220, NULL,
497 static ssize_t bus_rescan_store(struct device *dev,
498 struct device_attribute *attr,
499 const char *buf, size_t count)
502 struct pci_bus *bus = to_pci_bus(dev);
504 if (kstrtoul(buf, 0, &val) < 0)
508 pci_lock_rescan_remove();
509 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
510 pci_rescan_bus_bridge_resize(bus->self);
513 pci_unlock_rescan_remove();
517 static struct device_attribute dev_attr_bus_rescan = __ATTR(rescan, 0200, NULL,
520 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
521 static ssize_t d3cold_allowed_store(struct device *dev,
522 struct device_attribute *attr,
523 const char *buf, size_t count)
525 struct pci_dev *pdev = to_pci_dev(dev);
528 if (kstrtoul(buf, 0, &val) < 0)
531 pdev->d3cold_allowed = !!val;
532 if (pdev->d3cold_allowed)
533 pci_d3cold_enable(pdev);
535 pci_d3cold_disable(pdev);
537 pm_runtime_resume(dev);
542 static ssize_t d3cold_allowed_show(struct device *dev,
543 struct device_attribute *attr, char *buf)
545 struct pci_dev *pdev = to_pci_dev(dev);
546 return sysfs_emit(buf, "%u\n", pdev->d3cold_allowed);
548 static DEVICE_ATTR_RW(d3cold_allowed);
552 static ssize_t devspec_show(struct device *dev,
553 struct device_attribute *attr, char *buf)
555 struct pci_dev *pdev = to_pci_dev(dev);
556 struct device_node *np = pci_device_to_OF_node(pdev);
560 return sysfs_emit(buf, "%pOF\n", np);
562 static DEVICE_ATTR_RO(devspec);
565 static ssize_t driver_override_store(struct device *dev,
566 struct device_attribute *attr,
567 const char *buf, size_t count)
569 struct pci_dev *pdev = to_pci_dev(dev);
572 ret = driver_set_override(dev, &pdev->driver_override, buf, count);
579 static ssize_t driver_override_show(struct device *dev,
580 struct device_attribute *attr, char *buf)
582 struct pci_dev *pdev = to_pci_dev(dev);
586 len = sysfs_emit(buf, "%s\n", pdev->driver_override);
590 static DEVICE_ATTR_RW(driver_override);
592 static struct attribute *pci_dev_attrs[] = {
593 &dev_attr_power_state.attr,
594 &dev_attr_resource.attr,
595 &dev_attr_vendor.attr,
596 &dev_attr_device.attr,
597 &dev_attr_subsystem_vendor.attr,
598 &dev_attr_subsystem_device.attr,
599 &dev_attr_revision.attr,
600 &dev_attr_class.attr,
602 &dev_attr_local_cpus.attr,
603 &dev_attr_local_cpulist.attr,
604 &dev_attr_modalias.attr,
606 &dev_attr_numa_node.attr,
608 &dev_attr_dma_mask_bits.attr,
609 &dev_attr_consistent_dma_mask_bits.attr,
610 &dev_attr_enable.attr,
611 &dev_attr_broken_parity_status.attr,
612 &dev_attr_msi_bus.attr,
613 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
614 &dev_attr_d3cold_allowed.attr,
617 &dev_attr_devspec.attr,
619 &dev_attr_driver_override.attr,
620 &dev_attr_ari_enabled.attr,
624 static struct attribute *pci_bridge_attrs[] = {
625 &dev_attr_subordinate_bus_number.attr,
626 &dev_attr_secondary_bus_number.attr,
630 static struct attribute *pcie_dev_attrs[] = {
631 &dev_attr_current_link_speed.attr,
632 &dev_attr_current_link_width.attr,
633 &dev_attr_max_link_width.attr,
634 &dev_attr_max_link_speed.attr,
638 static struct attribute *pcibus_attrs[] = {
639 &dev_attr_bus_rescan.attr,
640 &dev_attr_cpuaffinity.attr,
641 &dev_attr_cpulistaffinity.attr,
645 static const struct attribute_group pcibus_group = {
646 .attrs = pcibus_attrs,
649 const struct attribute_group *pcibus_groups[] = {
654 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
657 struct pci_dev *pdev = to_pci_dev(dev);
658 struct pci_dev *vga_dev = vga_default_device();
661 return sysfs_emit(buf, "%u\n", (pdev == vga_dev));
663 return sysfs_emit(buf, "%u\n",
664 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
665 IORESOURCE_ROM_SHADOW));
667 static DEVICE_ATTR_RO(boot_vga);
669 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
670 struct bin_attribute *bin_attr, char *buf,
671 loff_t off, size_t count)
673 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
674 unsigned int size = 64;
675 loff_t init_off = off;
676 u8 *data = (u8 *) buf;
678 /* Several chips lock up trying to read undefined config space */
679 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
680 size = dev->cfg_size;
681 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
686 if (off + count > size) {
693 pci_config_pm_runtime_get(dev);
695 if ((off & 1) && size) {
697 pci_user_read_config_byte(dev, off, &val);
698 data[off - init_off] = val;
703 if ((off & 3) && size > 2) {
705 pci_user_read_config_word(dev, off, &val);
706 data[off - init_off] = val & 0xff;
707 data[off - init_off + 1] = (val >> 8) & 0xff;
714 pci_user_read_config_dword(dev, off, &val);
715 data[off - init_off] = val & 0xff;
716 data[off - init_off + 1] = (val >> 8) & 0xff;
717 data[off - init_off + 2] = (val >> 16) & 0xff;
718 data[off - init_off + 3] = (val >> 24) & 0xff;
726 pci_user_read_config_word(dev, off, &val);
727 data[off - init_off] = val & 0xff;
728 data[off - init_off + 1] = (val >> 8) & 0xff;
735 pci_user_read_config_byte(dev, off, &val);
736 data[off - init_off] = val;
739 pci_config_pm_runtime_put(dev);
744 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
745 struct bin_attribute *bin_attr, char *buf,
746 loff_t off, size_t count)
748 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
749 unsigned int size = count;
750 loff_t init_off = off;
751 u8 *data = (u8 *) buf;
754 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
758 if (resource_is_exclusive(&dev->driver_exclusive_resource, off,
760 pci_warn_once(dev, "%s: Unexpected write to kernel-exclusive config offset %llx",
762 add_taint(TAINT_USER, LOCKDEP_STILL_OK);
765 if (off > dev->cfg_size)
767 if (off + count > dev->cfg_size) {
768 size = dev->cfg_size - off;
772 pci_config_pm_runtime_get(dev);
774 if ((off & 1) && size) {
775 pci_user_write_config_byte(dev, off, data[off - init_off]);
780 if ((off & 3) && size > 2) {
781 u16 val = data[off - init_off];
782 val |= (u16) data[off - init_off + 1] << 8;
783 pci_user_write_config_word(dev, off, val);
789 u32 val = data[off - init_off];
790 val |= (u32) data[off - init_off + 1] << 8;
791 val |= (u32) data[off - init_off + 2] << 16;
792 val |= (u32) data[off - init_off + 3] << 24;
793 pci_user_write_config_dword(dev, off, val);
799 u16 val = data[off - init_off];
800 val |= (u16) data[off - init_off + 1] << 8;
801 pci_user_write_config_word(dev, off, val);
807 pci_user_write_config_byte(dev, off, data[off - init_off]);
809 pci_config_pm_runtime_put(dev);
813 static BIN_ATTR(config, 0644, pci_read_config, pci_write_config, 0);
815 static struct bin_attribute *pci_dev_config_attrs[] = {
820 static umode_t pci_dev_config_attr_is_visible(struct kobject *kobj,
821 struct bin_attribute *a, int n)
823 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
825 a->size = PCI_CFG_SPACE_SIZE;
826 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
827 a->size = PCI_CFG_SPACE_EXP_SIZE;
832 static const struct attribute_group pci_dev_config_attr_group = {
833 .bin_attrs = pci_dev_config_attrs,
834 .is_bin_visible = pci_dev_config_attr_is_visible,
837 #ifdef HAVE_PCI_LEGACY
839 * pci_read_legacy_io - read byte(s) from legacy I/O port space
840 * @filp: open sysfs file
841 * @kobj: kobject corresponding to file to read from
842 * @bin_attr: struct bin_attribute for this file
843 * @buf: buffer to store results
844 * @off: offset into legacy I/O port space
845 * @count: number of bytes to read
847 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
848 * callback routine (pci_legacy_read).
850 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
851 struct bin_attribute *bin_attr, char *buf,
852 loff_t off, size_t count)
854 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
856 /* Only support 1, 2 or 4 byte accesses */
857 if (count != 1 && count != 2 && count != 4)
860 return pci_legacy_read(bus, off, (u32 *)buf, count);
864 * pci_write_legacy_io - write byte(s) to legacy I/O port space
865 * @filp: open sysfs file
866 * @kobj: kobject corresponding to file to read from
867 * @bin_attr: struct bin_attribute for this file
868 * @buf: buffer containing value to be written
869 * @off: offset into legacy I/O port space
870 * @count: number of bytes to write
872 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
873 * callback routine (pci_legacy_write).
875 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
876 struct bin_attribute *bin_attr, char *buf,
877 loff_t off, size_t count)
879 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
881 /* Only support 1, 2 or 4 byte accesses */
882 if (count != 1 && count != 2 && count != 4)
885 return pci_legacy_write(bus, off, *(u32 *)buf, count);
889 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
890 * @filp: open sysfs file
891 * @kobj: kobject corresponding to device to be mapped
892 * @attr: struct bin_attribute for this file
893 * @vma: struct vm_area_struct passed to mmap
895 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
896 * legacy memory space (first meg of bus space) into application virtual
899 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
900 struct bin_attribute *attr,
901 struct vm_area_struct *vma)
903 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
905 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
909 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
910 * @filp: open sysfs file
911 * @kobj: kobject corresponding to device to be mapped
912 * @attr: struct bin_attribute for this file
913 * @vma: struct vm_area_struct passed to mmap
915 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
916 * legacy IO space (first meg of bus space) into application virtual
917 * memory space. Returns -ENOSYS if the operation isn't supported
919 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
920 struct bin_attribute *attr,
921 struct vm_area_struct *vma)
923 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
925 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
929 * pci_adjust_legacy_attr - adjustment of legacy file attributes
930 * @b: bus to create files under
931 * @mmap_type: I/O port or memory
933 * Stub implementation. Can be overridden by arch if necessary.
935 void __weak pci_adjust_legacy_attr(struct pci_bus *b,
936 enum pci_mmap_state mmap_type)
941 * pci_create_legacy_files - create legacy I/O port and memory files
942 * @b: bus to create files under
944 * Some platforms allow access to legacy I/O port and ISA memory space on
945 * a per-bus basis. This routine creates the files and ties them into
946 * their associated read, write and mmap files from pci-sysfs.c
948 * On error unwind, but don't propagate the error to the caller
949 * as it is ok to set up the PCI bus without these files.
951 void pci_create_legacy_files(struct pci_bus *b)
955 if (!sysfs_initialized)
958 b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
963 sysfs_bin_attr_init(b->legacy_io);
964 b->legacy_io->attr.name = "legacy_io";
965 b->legacy_io->size = 0xffff;
966 b->legacy_io->attr.mode = 0600;
967 b->legacy_io->read = pci_read_legacy_io;
968 b->legacy_io->write = pci_write_legacy_io;
969 b->legacy_io->mmap = pci_mmap_legacy_io;
970 b->legacy_io->f_mapping = iomem_get_mapping;
971 pci_adjust_legacy_attr(b, pci_mmap_io);
972 error = device_create_bin_file(&b->dev, b->legacy_io);
976 /* Allocated above after the legacy_io struct */
977 b->legacy_mem = b->legacy_io + 1;
978 sysfs_bin_attr_init(b->legacy_mem);
979 b->legacy_mem->attr.name = "legacy_mem";
980 b->legacy_mem->size = 1024*1024;
981 b->legacy_mem->attr.mode = 0600;
982 b->legacy_mem->mmap = pci_mmap_legacy_mem;
983 b->legacy_mem->f_mapping = iomem_get_mapping;
984 pci_adjust_legacy_attr(b, pci_mmap_mem);
985 error = device_create_bin_file(&b->dev, b->legacy_mem);
992 device_remove_bin_file(&b->dev, b->legacy_io);
997 dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n");
1000 void pci_remove_legacy_files(struct pci_bus *b)
1003 device_remove_bin_file(&b->dev, b->legacy_io);
1004 device_remove_bin_file(&b->dev, b->legacy_mem);
1005 kfree(b->legacy_io); /* both are allocated here */
1008 #endif /* HAVE_PCI_LEGACY */
1010 #if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
1012 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
1013 enum pci_mmap_api mmap_api)
1015 unsigned long nr, start, size;
1016 resource_size_t pci_start = 0, pci_end;
1018 if (pci_resource_len(pdev, resno) == 0)
1020 nr = vma_pages(vma);
1021 start = vma->vm_pgoff;
1022 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
1023 if (mmap_api == PCI_MMAP_PROCFS) {
1024 pci_resource_to_user(pdev, resno, &pdev->resource[resno],
1025 &pci_start, &pci_end);
1026 pci_start >>= PAGE_SHIFT;
1028 if (start >= pci_start && start < pci_start + size &&
1029 start + nr <= pci_start + size)
1035 * pci_mmap_resource - map a PCI resource into user memory space
1036 * @kobj: kobject for mapping
1037 * @attr: struct bin_attribute for the file being mapped
1038 * @vma: struct vm_area_struct passed into the mmap
1039 * @write_combine: 1 for write_combine mapping
1041 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1043 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1044 struct vm_area_struct *vma, int write_combine)
1046 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1047 int bar = (unsigned long)attr->private;
1048 enum pci_mmap_state mmap_type;
1049 struct resource *res = &pdev->resource[bar];
1052 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1056 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1059 if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1062 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1064 return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1067 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1068 struct bin_attribute *attr,
1069 struct vm_area_struct *vma)
1071 return pci_mmap_resource(kobj, attr, vma, 0);
1074 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1075 struct bin_attribute *attr,
1076 struct vm_area_struct *vma)
1078 return pci_mmap_resource(kobj, attr, vma, 1);
1081 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1082 struct bin_attribute *attr, char *buf,
1083 loff_t off, size_t count, bool write)
1085 #ifdef CONFIG_HAS_IOPORT
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);
1124 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1125 struct bin_attribute *attr, char *buf,
1126 loff_t off, size_t count)
1128 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1131 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1132 struct bin_attribute *attr, char *buf,
1133 loff_t off, size_t count)
1137 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1141 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1145 * pci_remove_resource_files - cleanup resource files
1146 * @pdev: dev to cleanup
1148 * If we created resource files for @pdev, remove them from sysfs and
1149 * free their resources.
1151 static void pci_remove_resource_files(struct pci_dev *pdev)
1155 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1156 struct bin_attribute *res_attr;
1158 res_attr = pdev->res_attr[i];
1160 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1164 res_attr = pdev->res_attr_wc[i];
1166 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1172 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1174 /* allocate attribute structure, piggyback attribute name */
1175 int name_len = write_combine ? 13 : 10;
1176 struct bin_attribute *res_attr;
1177 char *res_attr_name;
1180 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1184 res_attr_name = (char *)(res_attr + 1);
1186 sysfs_bin_attr_init(res_attr);
1187 if (write_combine) {
1188 sprintf(res_attr_name, "resource%d_wc", num);
1189 res_attr->mmap = pci_mmap_resource_wc;
1191 sprintf(res_attr_name, "resource%d", num);
1192 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1193 res_attr->read = pci_read_resource_io;
1194 res_attr->write = pci_write_resource_io;
1195 if (arch_can_pci_mmap_io())
1196 res_attr->mmap = pci_mmap_resource_uc;
1198 res_attr->mmap = pci_mmap_resource_uc;
1202 res_attr->f_mapping = iomem_get_mapping;
1203 res_attr->attr.name = res_attr_name;
1204 res_attr->attr.mode = 0600;
1205 res_attr->size = pci_resource_len(pdev, num);
1206 res_attr->private = (void *)(unsigned long)num;
1207 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1214 pdev->res_attr_wc[num] = res_attr;
1216 pdev->res_attr[num] = res_attr;
1222 * pci_create_resource_files - create resource files in sysfs for @dev
1223 * @pdev: dev in question
1225 * Walk the resources in @pdev creating files for each resource available.
1227 static int pci_create_resource_files(struct pci_dev *pdev)
1232 /* Expose the PCI resources from this device as files */
1233 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1235 /* skip empty resources */
1236 if (!pci_resource_len(pdev, i))
1239 retval = pci_create_attr(pdev, i, 0);
1240 /* for prefetchable resources, create a WC mappable file */
1241 if (!retval && arch_can_pci_mmap_wc() &&
1242 pdev->resource[i].flags & IORESOURCE_PREFETCH)
1243 retval = pci_create_attr(pdev, i, 1);
1245 pci_remove_resource_files(pdev);
1251 #else /* !(defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)) */
1252 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1253 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1257 * pci_write_rom - used to enable access to the PCI ROM display
1259 * @kobj: kernel object handle
1260 * @bin_attr: struct bin_attribute for this file
1263 * @count: number of byte in input
1265 * writing anything except 0 enables it
1267 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1268 struct bin_attribute *bin_attr, char *buf,
1269 loff_t off, size_t count)
1271 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1273 if ((off == 0) && (*buf == '0') && (count == 2))
1274 pdev->rom_attr_enabled = 0;
1276 pdev->rom_attr_enabled = 1;
1282 * pci_read_rom - read a PCI ROM
1284 * @kobj: kernel object handle
1285 * @bin_attr: struct bin_attribute for this file
1286 * @buf: where to put the data we read from the ROM
1288 * @count: number of bytes to read
1290 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1291 * device corresponding to @kobj.
1293 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1294 struct bin_attribute *bin_attr, char *buf,
1295 loff_t off, size_t count)
1297 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1301 if (!pdev->rom_attr_enabled)
1304 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1311 if (off + count > size)
1314 memcpy_fromio(buf, rom + off, count);
1316 pci_unmap_rom(pdev, rom);
1320 static BIN_ATTR(rom, 0600, pci_read_rom, pci_write_rom, 0);
1322 static struct bin_attribute *pci_dev_rom_attrs[] = {
1327 static umode_t pci_dev_rom_attr_is_visible(struct kobject *kobj,
1328 struct bin_attribute *a, int n)
1330 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1333 /* If the device has a ROM, try to expose it in sysfs. */
1334 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1340 return a->attr.mode;
1343 static const struct attribute_group pci_dev_rom_attr_group = {
1344 .bin_attrs = pci_dev_rom_attrs,
1345 .is_bin_visible = pci_dev_rom_attr_is_visible,
1348 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1349 const char *buf, size_t count)
1351 struct pci_dev *pdev = to_pci_dev(dev);
1355 if (kstrtoul(buf, 0, &val) < 0)
1361 pm_runtime_get_sync(dev);
1362 result = pci_reset_function(pdev);
1363 pm_runtime_put(dev);
1369 static DEVICE_ATTR_WO(reset);
1371 static struct attribute *pci_dev_reset_attrs[] = {
1372 &dev_attr_reset.attr,
1376 static umode_t pci_dev_reset_attr_is_visible(struct kobject *kobj,
1377 struct attribute *a, int n)
1379 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1381 if (!pci_reset_supported(pdev))
1387 static const struct attribute_group pci_dev_reset_attr_group = {
1388 .attrs = pci_dev_reset_attrs,
1389 .is_visible = pci_dev_reset_attr_is_visible,
1392 #define pci_dev_resource_resize_attr(n) \
1393 static ssize_t resource##n##_resize_show(struct device *dev, \
1394 struct device_attribute *attr, \
1397 struct pci_dev *pdev = to_pci_dev(dev); \
1400 pci_config_pm_runtime_get(pdev); \
1402 ret = sysfs_emit(buf, "%016llx\n", \
1403 (u64)pci_rebar_get_possible_sizes(pdev, n)); \
1405 pci_config_pm_runtime_put(pdev); \
1410 static ssize_t resource##n##_resize_store(struct device *dev, \
1411 struct device_attribute *attr,\
1412 const char *buf, size_t count)\
1414 struct pci_dev *pdev = to_pci_dev(dev); \
1415 unsigned long size, flags; \
1419 if (kstrtoul(buf, 0, &size) < 0) \
1423 if (dev->driver) { \
1428 pci_config_pm_runtime_get(pdev); \
1430 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) { \
1431 ret = aperture_remove_conflicting_pci_devices(pdev, \
1432 "resourceN_resize"); \
1437 pci_read_config_word(pdev, PCI_COMMAND, &cmd); \
1438 pci_write_config_word(pdev, PCI_COMMAND, \
1439 cmd & ~PCI_COMMAND_MEMORY); \
1441 flags = pci_resource_flags(pdev, n); \
1443 pci_remove_resource_files(pdev); \
1445 for (i = 0; i < PCI_STD_NUM_BARS; i++) { \
1446 if (pci_resource_len(pdev, i) && \
1447 pci_resource_flags(pdev, i) == flags) \
1448 pci_release_resource(pdev, i); \
1451 ret = pci_resize_resource(pdev, n, size); \
1453 pci_assign_unassigned_bus_resources(pdev->bus); \
1455 if (pci_create_resource_files(pdev)) \
1456 pci_warn(pdev, "Failed to recreate resource files after BAR resizing\n");\
1458 pci_write_config_word(pdev, PCI_COMMAND, cmd); \
1460 pci_config_pm_runtime_put(pdev); \
1462 device_unlock(dev); \
1464 return ret ? ret : count; \
1466 static DEVICE_ATTR_RW(resource##n##_resize)
1468 pci_dev_resource_resize_attr(0);
1469 pci_dev_resource_resize_attr(1);
1470 pci_dev_resource_resize_attr(2);
1471 pci_dev_resource_resize_attr(3);
1472 pci_dev_resource_resize_attr(4);
1473 pci_dev_resource_resize_attr(5);
1475 static struct attribute *resource_resize_attrs[] = {
1476 &dev_attr_resource0_resize.attr,
1477 &dev_attr_resource1_resize.attr,
1478 &dev_attr_resource2_resize.attr,
1479 &dev_attr_resource3_resize.attr,
1480 &dev_attr_resource4_resize.attr,
1481 &dev_attr_resource5_resize.attr,
1485 static umode_t resource_resize_is_visible(struct kobject *kobj,
1486 struct attribute *a, int n)
1488 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1490 return pci_rebar_get_current_size(pdev, n) < 0 ? 0 : a->mode;
1493 static const struct attribute_group pci_dev_resource_resize_group = {
1494 .attrs = resource_resize_attrs,
1495 .is_visible = resource_resize_is_visible,
1498 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1500 if (!sysfs_initialized)
1503 return pci_create_resource_files(pdev);
1507 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1508 * @pdev: device whose entries we should free
1510 * Cleanup when @pdev is removed from sysfs.
1512 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1514 if (!sysfs_initialized)
1517 pci_remove_resource_files(pdev);
1520 static int __init pci_sysfs_init(void)
1522 struct pci_dev *pdev = NULL;
1523 struct pci_bus *pbus = NULL;
1526 sysfs_initialized = 1;
1527 for_each_pci_dev(pdev) {
1528 retval = pci_create_sysfs_dev_files(pdev);
1535 while ((pbus = pci_find_next_bus(pbus)))
1536 pci_create_legacy_files(pbus);
1540 late_initcall(pci_sysfs_init);
1542 static struct attribute *pci_dev_dev_attrs[] = {
1543 &dev_attr_boot_vga.attr,
1547 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1548 struct attribute *a, int n)
1550 struct device *dev = kobj_to_dev(kobj);
1551 struct pci_dev *pdev = to_pci_dev(dev);
1553 if (a == &dev_attr_boot_vga.attr)
1554 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1560 static struct attribute *pci_dev_hp_attrs[] = {
1561 &dev_attr_remove.attr,
1562 &dev_attr_dev_rescan.attr,
1566 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1567 struct attribute *a, int n)
1569 struct device *dev = kobj_to_dev(kobj);
1570 struct pci_dev *pdev = to_pci_dev(dev);
1572 if (pdev->is_virtfn)
1578 static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1579 struct attribute *a, int n)
1581 struct device *dev = kobj_to_dev(kobj);
1582 struct pci_dev *pdev = to_pci_dev(dev);
1584 if (pci_is_bridge(pdev))
1590 static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1591 struct attribute *a, int n)
1593 struct device *dev = kobj_to_dev(kobj);
1594 struct pci_dev *pdev = to_pci_dev(dev);
1596 if (pci_is_pcie(pdev))
1602 static const struct attribute_group pci_dev_group = {
1603 .attrs = pci_dev_attrs,
1606 const struct attribute_group *pci_dev_groups[] = {
1608 &pci_dev_config_attr_group,
1609 &pci_dev_rom_attr_group,
1610 &pci_dev_reset_attr_group,
1611 &pci_dev_reset_method_attr_group,
1612 &pci_dev_vpd_attr_group,
1614 &pci_dev_smbios_attr_group,
1617 &pci_dev_acpi_attr_group,
1619 &pci_dev_resource_resize_group,
1623 static const struct attribute_group pci_dev_hp_attr_group = {
1624 .attrs = pci_dev_hp_attrs,
1625 .is_visible = pci_dev_hp_attrs_are_visible,
1628 static const struct attribute_group pci_dev_attr_group = {
1629 .attrs = pci_dev_dev_attrs,
1630 .is_visible = pci_dev_attrs_are_visible,
1633 static const struct attribute_group pci_bridge_attr_group = {
1634 .attrs = pci_bridge_attrs,
1635 .is_visible = pci_bridge_attrs_are_visible,
1638 static const struct attribute_group pcie_dev_attr_group = {
1639 .attrs = pcie_dev_attrs,
1640 .is_visible = pcie_dev_attrs_are_visible,
1643 static const struct attribute_group *pci_dev_attr_groups[] = {
1644 &pci_dev_attr_group,
1645 &pci_dev_hp_attr_group,
1646 #ifdef CONFIG_PCI_IOV
1647 &sriov_pf_dev_attr_group,
1648 &sriov_vf_dev_attr_group,
1650 &pci_bridge_attr_group,
1651 &pcie_dev_attr_group,
1652 #ifdef CONFIG_PCIEAER
1653 &aer_stats_attr_group,
1655 #ifdef CONFIG_PCIEASPM
1656 &aspm_ctrl_attr_group,
1661 const struct device_type pci_dev_type = {
1662 .groups = pci_dev_attr_groups,