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>
29 #include <linux/msi.h>
33 static int sysfs_initialized; /* = 0 */
35 /* show configuration fields */
36 #define pci_config_attr(field, format_string) \
38 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
40 struct pci_dev *pdev; \
42 pdev = to_pci_dev(dev); \
43 return sysfs_emit(buf, format_string, pdev->field); \
45 static DEVICE_ATTR_RO(field)
47 pci_config_attr(vendor, "0x%04x\n");
48 pci_config_attr(device, "0x%04x\n");
49 pci_config_attr(subsystem_vendor, "0x%04x\n");
50 pci_config_attr(subsystem_device, "0x%04x\n");
51 pci_config_attr(revision, "0x%02x\n");
52 pci_config_attr(class, "0x%06x\n");
54 static ssize_t irq_show(struct device *dev,
55 struct device_attribute *attr,
58 struct pci_dev *pdev = to_pci_dev(dev);
62 * For MSI, show the first MSI IRQ; for all other cases including
63 * MSI-X, show the legacy INTx IRQ.
65 if (pdev->msi_enabled)
66 return sysfs_emit(buf, "%u\n", pci_irq_vector(pdev, 0));
69 return sysfs_emit(buf, "%u\n", pdev->irq);
71 static DEVICE_ATTR_RO(irq);
73 static ssize_t broken_parity_status_show(struct device *dev,
74 struct device_attribute *attr,
77 struct pci_dev *pdev = to_pci_dev(dev);
78 return sysfs_emit(buf, "%u\n", pdev->broken_parity_status);
81 static ssize_t broken_parity_status_store(struct device *dev,
82 struct device_attribute *attr,
83 const char *buf, size_t count)
85 struct pci_dev *pdev = to_pci_dev(dev);
88 if (kstrtoul(buf, 0, &val) < 0)
91 pdev->broken_parity_status = !!val;
95 static DEVICE_ATTR_RW(broken_parity_status);
97 static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
98 struct device_attribute *attr, char *buf)
100 const struct cpumask *mask;
103 if (dev_to_node(dev) == NUMA_NO_NODE)
104 mask = cpu_online_mask;
106 mask = cpumask_of_node(dev_to_node(dev));
108 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
110 return cpumap_print_to_pagebuf(list, buf, mask);
113 static ssize_t local_cpus_show(struct device *dev,
114 struct device_attribute *attr, char *buf)
116 return pci_dev_show_local_cpu(dev, false, attr, buf);
118 static DEVICE_ATTR_RO(local_cpus);
120 static ssize_t local_cpulist_show(struct device *dev,
121 struct device_attribute *attr, char *buf)
123 return pci_dev_show_local_cpu(dev, true, attr, buf);
125 static DEVICE_ATTR_RO(local_cpulist);
128 * PCI Bus Class Devices
130 static ssize_t cpuaffinity_show(struct device *dev,
131 struct device_attribute *attr, char *buf)
133 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
135 return cpumap_print_to_pagebuf(false, buf, cpumask);
137 static DEVICE_ATTR_RO(cpuaffinity);
139 static ssize_t cpulistaffinity_show(struct device *dev,
140 struct device_attribute *attr, char *buf)
142 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
144 return cpumap_print_to_pagebuf(true, buf, cpumask);
146 static DEVICE_ATTR_RO(cpulistaffinity);
148 static ssize_t power_state_show(struct device *dev,
149 struct device_attribute *attr, char *buf)
151 struct pci_dev *pdev = to_pci_dev(dev);
153 return sysfs_emit(buf, "%s\n", pci_power_name(pdev->current_state));
155 static DEVICE_ATTR_RO(power_state);
158 static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
161 struct pci_dev *pci_dev = to_pci_dev(dev);
164 resource_size_t start, end;
167 if (pci_dev->subordinate)
168 max = DEVICE_COUNT_RESOURCE;
170 max = PCI_BRIDGE_RESOURCES;
172 for (i = 0; i < max; i++) {
173 struct resource *res = &pci_dev->resource[i];
174 pci_resource_to_user(pci_dev, i, res, &start, &end);
175 len += sysfs_emit_at(buf, len, "0x%016llx 0x%016llx 0x%016llx\n",
176 (unsigned long long)start,
177 (unsigned long long)end,
178 (unsigned long long)res->flags);
182 static DEVICE_ATTR_RO(resource);
184 static ssize_t max_link_speed_show(struct device *dev,
185 struct device_attribute *attr, char *buf)
187 struct pci_dev *pdev = to_pci_dev(dev);
189 return sysfs_emit(buf, "%s\n",
190 pci_speed_string(pcie_get_speed_cap(pdev)));
192 static DEVICE_ATTR_RO(max_link_speed);
194 static ssize_t max_link_width_show(struct device *dev,
195 struct device_attribute *attr, char *buf)
197 struct pci_dev *pdev = to_pci_dev(dev);
199 return sysfs_emit(buf, "%u\n", pcie_get_width_cap(pdev));
201 static DEVICE_ATTR_RO(max_link_width);
203 static ssize_t current_link_speed_show(struct device *dev,
204 struct device_attribute *attr, char *buf)
206 struct pci_dev *pci_dev = to_pci_dev(dev);
209 enum pci_bus_speed speed;
211 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
215 speed = pcie_link_speed[linkstat & PCI_EXP_LNKSTA_CLS];
217 return sysfs_emit(buf, "%s\n", pci_speed_string(speed));
219 static DEVICE_ATTR_RO(current_link_speed);
221 static ssize_t current_link_width_show(struct device *dev,
222 struct device_attribute *attr, char *buf)
224 struct pci_dev *pci_dev = to_pci_dev(dev);
228 err = pcie_capability_read_word(pci_dev, PCI_EXP_LNKSTA, &linkstat);
232 return sysfs_emit(buf, "%u\n",
233 (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT);
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(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);
570 char *driver_override, *old, *cp;
572 /* We need to keep extra room for a newline */
573 if (count >= (PAGE_SIZE - 1))
576 driver_override = kstrndup(buf, count, GFP_KERNEL);
577 if (!driver_override)
580 cp = strchr(driver_override, '\n');
585 old = pdev->driver_override;
586 if (strlen(driver_override)) {
587 pdev->driver_override = driver_override;
589 kfree(driver_override);
590 pdev->driver_override = NULL;
599 static ssize_t driver_override_show(struct device *dev,
600 struct device_attribute *attr, char *buf)
602 struct pci_dev *pdev = to_pci_dev(dev);
606 len = sysfs_emit(buf, "%s\n", pdev->driver_override);
610 static DEVICE_ATTR_RW(driver_override);
612 static struct attribute *pci_dev_attrs[] = {
613 &dev_attr_power_state.attr,
614 &dev_attr_resource.attr,
615 &dev_attr_vendor.attr,
616 &dev_attr_device.attr,
617 &dev_attr_subsystem_vendor.attr,
618 &dev_attr_subsystem_device.attr,
619 &dev_attr_revision.attr,
620 &dev_attr_class.attr,
622 &dev_attr_local_cpus.attr,
623 &dev_attr_local_cpulist.attr,
624 &dev_attr_modalias.attr,
626 &dev_attr_numa_node.attr,
628 &dev_attr_dma_mask_bits.attr,
629 &dev_attr_consistent_dma_mask_bits.attr,
630 &dev_attr_enable.attr,
631 &dev_attr_broken_parity_status.attr,
632 &dev_attr_msi_bus.attr,
633 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
634 &dev_attr_d3cold_allowed.attr,
637 &dev_attr_devspec.attr,
639 &dev_attr_driver_override.attr,
640 &dev_attr_ari_enabled.attr,
644 static struct attribute *pci_bridge_attrs[] = {
645 &dev_attr_subordinate_bus_number.attr,
646 &dev_attr_secondary_bus_number.attr,
650 static struct attribute *pcie_dev_attrs[] = {
651 &dev_attr_current_link_speed.attr,
652 &dev_attr_current_link_width.attr,
653 &dev_attr_max_link_width.attr,
654 &dev_attr_max_link_speed.attr,
658 static struct attribute *pcibus_attrs[] = {
659 &dev_attr_bus_rescan.attr,
660 &dev_attr_cpuaffinity.attr,
661 &dev_attr_cpulistaffinity.attr,
665 static const struct attribute_group pcibus_group = {
666 .attrs = pcibus_attrs,
669 const struct attribute_group *pcibus_groups[] = {
674 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
677 struct pci_dev *pdev = to_pci_dev(dev);
678 struct pci_dev *vga_dev = vga_default_device();
681 return sysfs_emit(buf, "%u\n", (pdev == vga_dev));
683 return sysfs_emit(buf, "%u\n",
684 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
685 IORESOURCE_ROM_SHADOW));
687 static DEVICE_ATTR_RO(boot_vga);
689 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
690 struct bin_attribute *bin_attr, char *buf,
691 loff_t off, size_t count)
693 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
694 unsigned int size = 64;
695 loff_t init_off = off;
696 u8 *data = (u8 *) buf;
698 /* Several chips lock up trying to read undefined config space */
699 if (file_ns_capable(filp, &init_user_ns, CAP_SYS_ADMIN))
700 size = dev->cfg_size;
701 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
706 if (off + count > size) {
713 pci_config_pm_runtime_get(dev);
715 if ((off & 1) && size) {
717 pci_user_read_config_byte(dev, off, &val);
718 data[off - init_off] = val;
723 if ((off & 3) && size > 2) {
725 pci_user_read_config_word(dev, off, &val);
726 data[off - init_off] = val & 0xff;
727 data[off - init_off + 1] = (val >> 8) & 0xff;
734 pci_user_read_config_dword(dev, off, &val);
735 data[off - init_off] = val & 0xff;
736 data[off - init_off + 1] = (val >> 8) & 0xff;
737 data[off - init_off + 2] = (val >> 16) & 0xff;
738 data[off - init_off + 3] = (val >> 24) & 0xff;
746 pci_user_read_config_word(dev, off, &val);
747 data[off - init_off] = val & 0xff;
748 data[off - init_off + 1] = (val >> 8) & 0xff;
755 pci_user_read_config_byte(dev, off, &val);
756 data[off - init_off] = val;
761 pci_config_pm_runtime_put(dev);
766 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
767 struct bin_attribute *bin_attr, char *buf,
768 loff_t off, size_t count)
770 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
771 unsigned int size = count;
772 loff_t init_off = off;
773 u8 *data = (u8 *) buf;
776 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
780 if (off > dev->cfg_size)
782 if (off + count > dev->cfg_size) {
783 size = dev->cfg_size - off;
787 pci_config_pm_runtime_get(dev);
789 if ((off & 1) && size) {
790 pci_user_write_config_byte(dev, off, data[off - init_off]);
795 if ((off & 3) && size > 2) {
796 u16 val = data[off - init_off];
797 val |= (u16) data[off - init_off + 1] << 8;
798 pci_user_write_config_word(dev, off, val);
804 u32 val = data[off - init_off];
805 val |= (u32) data[off - init_off + 1] << 8;
806 val |= (u32) data[off - init_off + 2] << 16;
807 val |= (u32) data[off - init_off + 3] << 24;
808 pci_user_write_config_dword(dev, off, val);
814 u16 val = data[off - init_off];
815 val |= (u16) data[off - init_off + 1] << 8;
816 pci_user_write_config_word(dev, off, val);
822 pci_user_write_config_byte(dev, off, data[off - init_off]);
827 pci_config_pm_runtime_put(dev);
831 static BIN_ATTR(config, 0644, pci_read_config, pci_write_config, 0);
833 static struct bin_attribute *pci_dev_config_attrs[] = {
838 static umode_t pci_dev_config_attr_is_visible(struct kobject *kobj,
839 struct bin_attribute *a, int n)
841 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
843 a->size = PCI_CFG_SPACE_SIZE;
844 if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
845 a->size = PCI_CFG_SPACE_EXP_SIZE;
850 static const struct attribute_group pci_dev_config_attr_group = {
851 .bin_attrs = pci_dev_config_attrs,
852 .is_bin_visible = pci_dev_config_attr_is_visible,
855 #ifdef HAVE_PCI_LEGACY
857 * pci_read_legacy_io - read byte(s) from legacy I/O port space
858 * @filp: open sysfs file
859 * @kobj: kobject corresponding to file to read from
860 * @bin_attr: struct bin_attribute for this file
861 * @buf: buffer to store results
862 * @off: offset into legacy I/O port space
863 * @count: number of bytes to read
865 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
866 * callback routine (pci_legacy_read).
868 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
869 struct bin_attribute *bin_attr, char *buf,
870 loff_t off, size_t count)
872 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
874 /* Only support 1, 2 or 4 byte accesses */
875 if (count != 1 && count != 2 && count != 4)
878 return pci_legacy_read(bus, off, (u32 *)buf, count);
882 * pci_write_legacy_io - write byte(s) to legacy I/O port space
883 * @filp: open sysfs file
884 * @kobj: kobject corresponding to file to read from
885 * @bin_attr: struct bin_attribute for this file
886 * @buf: buffer containing value to be written
887 * @off: offset into legacy I/O port space
888 * @count: number of bytes to write
890 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
891 * callback routine (pci_legacy_write).
893 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
894 struct bin_attribute *bin_attr, char *buf,
895 loff_t off, size_t count)
897 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
899 /* Only support 1, 2 or 4 byte accesses */
900 if (count != 1 && count != 2 && count != 4)
903 return pci_legacy_write(bus, off, *(u32 *)buf, count);
907 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
908 * @filp: open sysfs file
909 * @kobj: kobject corresponding to device to be mapped
910 * @attr: struct bin_attribute for this file
911 * @vma: struct vm_area_struct passed to mmap
913 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
914 * legacy memory space (first meg of bus space) into application virtual
917 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
918 struct bin_attribute *attr,
919 struct vm_area_struct *vma)
921 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
923 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
927 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
928 * @filp: open sysfs file
929 * @kobj: kobject corresponding to device to be mapped
930 * @attr: struct bin_attribute for this file
931 * @vma: struct vm_area_struct passed to mmap
933 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
934 * legacy IO space (first meg of bus space) into application virtual
935 * memory space. Returns -ENOSYS if the operation isn't supported
937 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
938 struct bin_attribute *attr,
939 struct vm_area_struct *vma)
941 struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj));
943 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
947 * pci_adjust_legacy_attr - adjustment of legacy file attributes
948 * @b: bus to create files under
949 * @mmap_type: I/O port or memory
951 * Stub implementation. Can be overridden by arch if necessary.
953 void __weak pci_adjust_legacy_attr(struct pci_bus *b,
954 enum pci_mmap_state mmap_type)
959 * pci_create_legacy_files - create legacy I/O port and memory files
960 * @b: bus to create files under
962 * Some platforms allow access to legacy I/O port and ISA memory space on
963 * a per-bus basis. This routine creates the files and ties them into
964 * their associated read, write and mmap files from pci-sysfs.c
966 * On error unwind, but don't propagate the error to the caller
967 * as it is ok to set up the PCI bus without these files.
969 void pci_create_legacy_files(struct pci_bus *b)
973 if (!sysfs_initialized)
976 b->legacy_io = kcalloc(2, sizeof(struct bin_attribute),
981 sysfs_bin_attr_init(b->legacy_io);
982 b->legacy_io->attr.name = "legacy_io";
983 b->legacy_io->size = 0xffff;
984 b->legacy_io->attr.mode = 0600;
985 b->legacy_io->read = pci_read_legacy_io;
986 b->legacy_io->write = pci_write_legacy_io;
987 b->legacy_io->mmap = pci_mmap_legacy_io;
988 b->legacy_io->f_mapping = iomem_get_mapping;
989 pci_adjust_legacy_attr(b, pci_mmap_io);
990 error = device_create_bin_file(&b->dev, b->legacy_io);
994 /* Allocated above after the legacy_io struct */
995 b->legacy_mem = b->legacy_io + 1;
996 sysfs_bin_attr_init(b->legacy_mem);
997 b->legacy_mem->attr.name = "legacy_mem";
998 b->legacy_mem->size = 1024*1024;
999 b->legacy_mem->attr.mode = 0600;
1000 b->legacy_mem->mmap = pci_mmap_legacy_mem;
1001 b->legacy_mem->f_mapping = iomem_get_mapping;
1002 pci_adjust_legacy_attr(b, pci_mmap_mem);
1003 error = device_create_bin_file(&b->dev, b->legacy_mem);
1005 goto legacy_mem_err;
1010 device_remove_bin_file(&b->dev, b->legacy_io);
1012 kfree(b->legacy_io);
1013 b->legacy_io = NULL;
1015 dev_warn(&b->dev, "could not create legacy I/O port and ISA memory resources in sysfs\n");
1018 void pci_remove_legacy_files(struct pci_bus *b)
1021 device_remove_bin_file(&b->dev, b->legacy_io);
1022 device_remove_bin_file(&b->dev, b->legacy_mem);
1023 kfree(b->legacy_io); /* both are allocated here */
1026 #endif /* HAVE_PCI_LEGACY */
1028 #if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
1030 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
1031 enum pci_mmap_api mmap_api)
1033 unsigned long nr, start, size;
1034 resource_size_t pci_start = 0, pci_end;
1036 if (pci_resource_len(pdev, resno) == 0)
1038 nr = vma_pages(vma);
1039 start = vma->vm_pgoff;
1040 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
1041 if (mmap_api == PCI_MMAP_PROCFS) {
1042 pci_resource_to_user(pdev, resno, &pdev->resource[resno],
1043 &pci_start, &pci_end);
1044 pci_start >>= PAGE_SHIFT;
1046 if (start >= pci_start && start < pci_start + size &&
1047 start + nr <= pci_start + size)
1053 * pci_mmap_resource - map a PCI resource into user memory space
1054 * @kobj: kobject for mapping
1055 * @attr: struct bin_attribute for the file being mapped
1056 * @vma: struct vm_area_struct passed into the mmap
1057 * @write_combine: 1 for write_combine mapping
1059 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1061 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
1062 struct vm_area_struct *vma, int write_combine)
1064 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1065 int bar = (unsigned long)attr->private;
1066 enum pci_mmap_state mmap_type;
1067 struct resource *res = &pdev->resource[bar];
1070 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1074 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
1077 if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
1080 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1082 return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
1085 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1086 struct bin_attribute *attr,
1087 struct vm_area_struct *vma)
1089 return pci_mmap_resource(kobj, attr, vma, 0);
1092 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1093 struct bin_attribute *attr,
1094 struct vm_area_struct *vma)
1096 return pci_mmap_resource(kobj, attr, vma, 1);
1099 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1100 struct bin_attribute *attr, char *buf,
1101 loff_t off, size_t count, bool write)
1103 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1104 int bar = (unsigned long)attr->private;
1105 unsigned long port = off;
1107 port += pci_resource_start(pdev, bar);
1109 if (port > pci_resource_end(pdev, bar))
1112 if (port + count - 1 > pci_resource_end(pdev, bar))
1118 outb(*(u8 *)buf, port);
1120 *(u8 *)buf = inb(port);
1124 outw(*(u16 *)buf, port);
1126 *(u16 *)buf = inw(port);
1130 outl(*(u32 *)buf, port);
1132 *(u32 *)buf = inl(port);
1138 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1139 struct bin_attribute *attr, char *buf,
1140 loff_t off, size_t count)
1142 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1145 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1146 struct bin_attribute *attr, char *buf,
1147 loff_t off, size_t count)
1151 ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
1155 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1159 * pci_remove_resource_files - cleanup resource files
1160 * @pdev: dev to cleanup
1162 * If we created resource files for @pdev, remove them from sysfs and
1163 * free their resources.
1165 static void pci_remove_resource_files(struct pci_dev *pdev)
1169 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1170 struct bin_attribute *res_attr;
1172 res_attr = pdev->res_attr[i];
1174 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1178 res_attr = pdev->res_attr_wc[i];
1180 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1186 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1188 /* allocate attribute structure, piggyback attribute name */
1189 int name_len = write_combine ? 13 : 10;
1190 struct bin_attribute *res_attr;
1191 char *res_attr_name;
1194 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1198 res_attr_name = (char *)(res_attr + 1);
1200 sysfs_bin_attr_init(res_attr);
1201 if (write_combine) {
1202 pdev->res_attr_wc[num] = res_attr;
1203 sprintf(res_attr_name, "resource%d_wc", num);
1204 res_attr->mmap = pci_mmap_resource_wc;
1206 pdev->res_attr[num] = res_attr;
1207 sprintf(res_attr_name, "resource%d", num);
1208 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1209 res_attr->read = pci_read_resource_io;
1210 res_attr->write = pci_write_resource_io;
1211 if (arch_can_pci_mmap_io())
1212 res_attr->mmap = pci_mmap_resource_uc;
1214 res_attr->mmap = pci_mmap_resource_uc;
1218 res_attr->f_mapping = iomem_get_mapping;
1219 res_attr->attr.name = res_attr_name;
1220 res_attr->attr.mode = 0600;
1221 res_attr->size = pci_resource_len(pdev, num);
1222 res_attr->private = (void *)(unsigned long)num;
1223 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1231 * pci_create_resource_files - create resource files in sysfs for @dev
1232 * @pdev: dev in question
1234 * Walk the resources in @pdev creating files for each resource available.
1236 static int pci_create_resource_files(struct pci_dev *pdev)
1241 /* Expose the PCI resources from this device as files */
1242 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
1244 /* skip empty resources */
1245 if (!pci_resource_len(pdev, i))
1248 retval = pci_create_attr(pdev, i, 0);
1249 /* for prefetchable resources, create a WC mappable file */
1250 if (!retval && arch_can_pci_mmap_wc() &&
1251 pdev->resource[i].flags & IORESOURCE_PREFETCH)
1252 retval = pci_create_attr(pdev, i, 1);
1254 pci_remove_resource_files(pdev);
1260 #else /* !(defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)) */
1261 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1262 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1266 * pci_write_rom - used to enable access to the PCI ROM display
1268 * @kobj: kernel object handle
1269 * @bin_attr: struct bin_attribute for this file
1272 * @count: number of byte in input
1274 * writing anything except 0 enables it
1276 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1277 struct bin_attribute *bin_attr, char *buf,
1278 loff_t off, size_t count)
1280 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1282 if ((off == 0) && (*buf == '0') && (count == 2))
1283 pdev->rom_attr_enabled = 0;
1285 pdev->rom_attr_enabled = 1;
1291 * pci_read_rom - read a PCI ROM
1293 * @kobj: kernel object handle
1294 * @bin_attr: struct bin_attribute for this file
1295 * @buf: where to put the data we read from the ROM
1297 * @count: number of bytes to read
1299 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1300 * device corresponding to @kobj.
1302 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1303 struct bin_attribute *bin_attr, char *buf,
1304 loff_t off, size_t count)
1306 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1310 if (!pdev->rom_attr_enabled)
1313 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1320 if (off + count > size)
1323 memcpy_fromio(buf, rom + off, count);
1325 pci_unmap_rom(pdev, rom);
1329 static BIN_ATTR(rom, 0600, pci_read_rom, pci_write_rom, 0);
1331 static struct bin_attribute *pci_dev_rom_attrs[] = {
1336 static umode_t pci_dev_rom_attr_is_visible(struct kobject *kobj,
1337 struct bin_attribute *a, int n)
1339 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1342 /* If the device has a ROM, try to expose it in sysfs. */
1343 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1349 return a->attr.mode;
1352 static const struct attribute_group pci_dev_rom_attr_group = {
1353 .bin_attrs = pci_dev_rom_attrs,
1354 .is_bin_visible = pci_dev_rom_attr_is_visible,
1357 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1358 const char *buf, size_t count)
1360 struct pci_dev *pdev = to_pci_dev(dev);
1364 if (kstrtoul(buf, 0, &val) < 0)
1370 pm_runtime_get_sync(dev);
1371 result = pci_reset_function(pdev);
1372 pm_runtime_put(dev);
1378 static DEVICE_ATTR_WO(reset);
1380 static struct attribute *pci_dev_reset_attrs[] = {
1381 &dev_attr_reset.attr,
1385 static umode_t pci_dev_reset_attr_is_visible(struct kobject *kobj,
1386 struct attribute *a, int n)
1388 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
1390 if (!pci_reset_supported(pdev))
1396 static const struct attribute_group pci_dev_reset_attr_group = {
1397 .attrs = pci_dev_reset_attrs,
1398 .is_visible = pci_dev_reset_attr_is_visible,
1401 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1403 if (!sysfs_initialized)
1406 return pci_create_resource_files(pdev);
1410 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1411 * @pdev: device whose entries we should free
1413 * Cleanup when @pdev is removed from sysfs.
1415 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1417 if (!sysfs_initialized)
1420 pci_remove_resource_files(pdev);
1423 static int __init pci_sysfs_init(void)
1425 struct pci_dev *pdev = NULL;
1426 struct pci_bus *pbus = NULL;
1429 sysfs_initialized = 1;
1430 for_each_pci_dev(pdev) {
1431 retval = pci_create_sysfs_dev_files(pdev);
1438 while ((pbus = pci_find_next_bus(pbus)))
1439 pci_create_legacy_files(pbus);
1443 late_initcall(pci_sysfs_init);
1445 static struct attribute *pci_dev_dev_attrs[] = {
1446 &dev_attr_boot_vga.attr,
1450 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1451 struct attribute *a, int n)
1453 struct device *dev = kobj_to_dev(kobj);
1454 struct pci_dev *pdev = to_pci_dev(dev);
1456 if (a == &dev_attr_boot_vga.attr)
1457 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1463 static struct attribute *pci_dev_hp_attrs[] = {
1464 &dev_attr_remove.attr,
1465 &dev_attr_dev_rescan.attr,
1469 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1470 struct attribute *a, int n)
1472 struct device *dev = kobj_to_dev(kobj);
1473 struct pci_dev *pdev = to_pci_dev(dev);
1475 if (pdev->is_virtfn)
1481 static umode_t pci_bridge_attrs_are_visible(struct kobject *kobj,
1482 struct attribute *a, int n)
1484 struct device *dev = kobj_to_dev(kobj);
1485 struct pci_dev *pdev = to_pci_dev(dev);
1487 if (pci_is_bridge(pdev))
1493 static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
1494 struct attribute *a, int n)
1496 struct device *dev = kobj_to_dev(kobj);
1497 struct pci_dev *pdev = to_pci_dev(dev);
1499 if (pci_is_pcie(pdev))
1505 static const struct attribute_group pci_dev_group = {
1506 .attrs = pci_dev_attrs,
1509 const struct attribute_group *pci_dev_groups[] = {
1511 &pci_dev_config_attr_group,
1512 &pci_dev_rom_attr_group,
1513 &pci_dev_reset_attr_group,
1514 &pci_dev_reset_method_attr_group,
1515 &pci_dev_vpd_attr_group,
1517 &pci_dev_smbios_attr_group,
1520 &pci_dev_acpi_attr_group,
1525 static const struct attribute_group pci_dev_hp_attr_group = {
1526 .attrs = pci_dev_hp_attrs,
1527 .is_visible = pci_dev_hp_attrs_are_visible,
1530 static const struct attribute_group pci_dev_attr_group = {
1531 .attrs = pci_dev_dev_attrs,
1532 .is_visible = pci_dev_attrs_are_visible,
1535 static const struct attribute_group pci_bridge_attr_group = {
1536 .attrs = pci_bridge_attrs,
1537 .is_visible = pci_bridge_attrs_are_visible,
1540 static const struct attribute_group pcie_dev_attr_group = {
1541 .attrs = pcie_dev_attrs,
1542 .is_visible = pcie_dev_attrs_are_visible,
1545 static const struct attribute_group *pci_dev_attr_groups[] = {
1546 &pci_dev_attr_group,
1547 &pci_dev_hp_attr_group,
1548 #ifdef CONFIG_PCI_IOV
1549 &sriov_pf_dev_attr_group,
1550 &sriov_vf_dev_attr_group,
1552 &pci_bridge_attr_group,
1553 &pcie_dev_attr_group,
1554 #ifdef CONFIG_PCIEAER
1555 &aer_stats_attr_group,
1557 #ifdef CONFIG_PCIEASPM
1558 &aspm_ctrl_attr_group,
1563 const struct device_type pci_dev_type = {
1564 .groups = pci_dev_attr_groups,