2 * drivers/pci/pci-sysfs.c
4 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
5 * (C) Copyright 2002-2004 IBM Corp.
6 * (C) Copyright 2003 Matthew Wilcox
7 * (C) Copyright 2003 Hewlett-Packard
8 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
9 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
11 * File attributes for PCI devices
13 * Modeled after usb's driverfs.c
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/pci.h>
21 #include <linux/stat.h>
22 #include <linux/export.h>
23 #include <linux/topology.h>
26 #include <linux/capability.h>
27 #include <linux/security.h>
28 #include <linux/pci-aspm.h>
29 #include <linux/slab.h>
30 #include <linux/vgaarb.h>
31 #include <linux/pm_runtime.h>
35 static int sysfs_initialized; /* = 0 */
37 /* show configuration fields */
38 #define pci_config_attr(field, format_string) \
40 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
42 struct pci_dev *pdev; \
44 pdev = to_pci_dev(dev); \
45 return sprintf(buf, format_string, pdev->field); \
47 static DEVICE_ATTR_RO(field)
49 pci_config_attr(vendor, "0x%04x\n");
50 pci_config_attr(device, "0x%04x\n");
51 pci_config_attr(subsystem_vendor, "0x%04x\n");
52 pci_config_attr(subsystem_device, "0x%04x\n");
53 pci_config_attr(class, "0x%06x\n");
54 pci_config_attr(irq, "%u\n");
56 static ssize_t broken_parity_status_show(struct device *dev,
57 struct device_attribute *attr,
60 struct pci_dev *pdev = to_pci_dev(dev);
61 return sprintf(buf, "%u\n", pdev->broken_parity_status);
64 static ssize_t broken_parity_status_store(struct device *dev,
65 struct device_attribute *attr,
66 const char *buf, size_t count)
68 struct pci_dev *pdev = to_pci_dev(dev);
71 if (kstrtoul(buf, 0, &val) < 0)
74 pdev->broken_parity_status = !!val;
78 static DEVICE_ATTR_RW(broken_parity_status);
80 static ssize_t pci_dev_show_local_cpu(struct device *dev, bool list,
81 struct device_attribute *attr, char *buf)
83 const struct cpumask *mask;
86 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
87 cpumask_of_node(dev_to_node(dev));
89 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
91 return cpumap_print_to_pagebuf(list, buf, mask);
94 static ssize_t local_cpus_show(struct device *dev,
95 struct device_attribute *attr, char *buf)
97 return pci_dev_show_local_cpu(dev, false, attr, buf);
99 static DEVICE_ATTR_RO(local_cpus);
101 static ssize_t local_cpulist_show(struct device *dev,
102 struct device_attribute *attr, char *buf)
104 return pci_dev_show_local_cpu(dev, true, attr, buf);
106 static DEVICE_ATTR_RO(local_cpulist);
109 * PCI Bus Class Devices
111 static ssize_t cpuaffinity_show(struct device *dev,
112 struct device_attribute *attr, char *buf)
114 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
116 return cpumap_print_to_pagebuf(false, buf, cpumask);
118 static DEVICE_ATTR_RO(cpuaffinity);
120 static ssize_t cpulistaffinity_show(struct device *dev,
121 struct device_attribute *attr, char *buf)
123 const struct cpumask *cpumask = cpumask_of_pcibus(to_pci_bus(dev));
125 return cpumap_print_to_pagebuf(true, buf, cpumask);
127 static DEVICE_ATTR_RO(cpulistaffinity);
130 static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
133 struct pci_dev *pci_dev = to_pci_dev(dev);
137 resource_size_t start, end;
139 if (pci_dev->subordinate)
140 max = DEVICE_COUNT_RESOURCE;
142 max = PCI_BRIDGE_RESOURCES;
144 for (i = 0; i < max; i++) {
145 struct resource *res = &pci_dev->resource[i];
146 pci_resource_to_user(pci_dev, i, res, &start, &end);
147 str += sprintf(str, "0x%016llx 0x%016llx 0x%016llx\n",
148 (unsigned long long)start,
149 (unsigned long long)end,
150 (unsigned long long)res->flags);
154 static DEVICE_ATTR_RO(resource);
156 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
159 struct pci_dev *pci_dev = to_pci_dev(dev);
161 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
162 pci_dev->vendor, pci_dev->device,
163 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
164 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
165 (u8)(pci_dev->class));
167 static DEVICE_ATTR_RO(modalias);
169 static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
170 const char *buf, size_t count)
172 struct pci_dev *pdev = to_pci_dev(dev);
174 ssize_t result = kstrtoul(buf, 0, &val);
179 /* this can crash the machine when done on the "wrong" device */
180 if (!capable(CAP_SYS_ADMIN))
184 if (pci_is_enabled(pdev))
185 pci_disable_device(pdev);
189 result = pci_enable_device(pdev);
191 return result < 0 ? result : count;
194 static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
197 struct pci_dev *pdev;
199 pdev = to_pci_dev(dev);
200 return sprintf(buf, "%u\n", atomic_read(&pdev->enable_cnt));
202 static DEVICE_ATTR_RW(enable);
205 static ssize_t numa_node_store(struct device *dev,
206 struct device_attribute *attr, const char *buf,
209 struct pci_dev *pdev = to_pci_dev(dev);
212 if (!capable(CAP_SYS_ADMIN))
215 ret = kstrtoint(buf, 0, &node);
219 if (node >= MAX_NUMNODES || !node_online(node))
222 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
223 dev_alert(&pdev->dev, FW_BUG "Overriding NUMA node to %d. Contact your vendor for updates.",
226 dev->numa_node = node;
230 static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr,
233 return sprintf(buf, "%d\n", dev->numa_node);
235 static DEVICE_ATTR_RW(numa_node);
238 static ssize_t dma_mask_bits_show(struct device *dev,
239 struct device_attribute *attr, char *buf)
241 struct pci_dev *pdev = to_pci_dev(dev);
243 return sprintf(buf, "%d\n", fls64(pdev->dma_mask));
245 static DEVICE_ATTR_RO(dma_mask_bits);
247 static ssize_t consistent_dma_mask_bits_show(struct device *dev,
248 struct device_attribute *attr,
251 return sprintf(buf, "%d\n", fls64(dev->coherent_dma_mask));
253 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
255 static ssize_t msi_bus_show(struct device *dev, struct device_attribute *attr,
258 struct pci_dev *pdev = to_pci_dev(dev);
259 struct pci_bus *subordinate = pdev->subordinate;
261 return sprintf(buf, "%u\n", subordinate ?
262 !(subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI)
266 static ssize_t msi_bus_store(struct device *dev, struct device_attribute *attr,
267 const char *buf, size_t count)
269 struct pci_dev *pdev = to_pci_dev(dev);
270 struct pci_bus *subordinate = pdev->subordinate;
273 if (kstrtoul(buf, 0, &val) < 0)
276 if (!capable(CAP_SYS_ADMIN))
280 * "no_msi" and "bus_flags" only affect what happens when a driver
281 * requests MSI or MSI-X. They don't affect any drivers that have
282 * already requested MSI or MSI-X.
286 dev_info(&pdev->dev, "MSI/MSI-X %s for future drivers\n",
287 val ? "allowed" : "disallowed");
292 subordinate->bus_flags &= ~PCI_BUS_FLAGS_NO_MSI;
294 subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
296 dev_info(&subordinate->dev, "MSI/MSI-X %s for future drivers of devices on this bus\n",
297 val ? "allowed" : "disallowed");
300 static DEVICE_ATTR_RW(msi_bus);
302 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
306 struct pci_bus *b = NULL;
308 if (kstrtoul(buf, 0, &val) < 0)
312 pci_lock_rescan_remove();
313 while ((b = pci_find_next_bus(b)) != NULL)
315 pci_unlock_rescan_remove();
319 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
321 static struct attribute *pci_bus_attrs[] = {
322 &bus_attr_rescan.attr,
326 static const struct attribute_group pci_bus_group = {
327 .attrs = pci_bus_attrs,
330 const struct attribute_group *pci_bus_groups[] = {
335 static ssize_t dev_rescan_store(struct device *dev,
336 struct device_attribute *attr, const char *buf,
340 struct pci_dev *pdev = to_pci_dev(dev);
342 if (kstrtoul(buf, 0, &val) < 0)
346 pci_lock_rescan_remove();
347 pci_rescan_bus(pdev->bus);
348 pci_unlock_rescan_remove();
352 static struct device_attribute dev_rescan_attr = __ATTR(rescan,
354 NULL, dev_rescan_store);
356 static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
357 const char *buf, size_t count)
361 if (kstrtoul(buf, 0, &val) < 0)
364 if (val && device_remove_file_self(dev, attr))
365 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
368 static struct device_attribute dev_remove_attr = __ATTR(remove,
372 static ssize_t dev_bus_rescan_store(struct device *dev,
373 struct device_attribute *attr,
374 const char *buf, size_t count)
377 struct pci_bus *bus = to_pci_bus(dev);
379 if (kstrtoul(buf, 0, &val) < 0)
383 pci_lock_rescan_remove();
384 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
385 pci_rescan_bus_bridge_resize(bus->self);
388 pci_unlock_rescan_remove();
392 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
394 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
395 static ssize_t d3cold_allowed_store(struct device *dev,
396 struct device_attribute *attr,
397 const char *buf, size_t count)
399 struct pci_dev *pdev = to_pci_dev(dev);
402 if (kstrtoul(buf, 0, &val) < 0)
405 pdev->d3cold_allowed = !!val;
406 pm_runtime_resume(dev);
411 static ssize_t d3cold_allowed_show(struct device *dev,
412 struct device_attribute *attr, char *buf)
414 struct pci_dev *pdev = to_pci_dev(dev);
415 return sprintf(buf, "%u\n", pdev->d3cold_allowed);
417 static DEVICE_ATTR_RW(d3cold_allowed);
421 static ssize_t devspec_show(struct device *dev,
422 struct device_attribute *attr, char *buf)
424 struct pci_dev *pdev = to_pci_dev(dev);
425 struct device_node *np = pci_device_to_OF_node(pdev);
427 if (np == NULL || np->full_name == NULL)
429 return sprintf(buf, "%s", np->full_name);
431 static DEVICE_ATTR_RO(devspec);
434 #ifdef CONFIG_PCI_IOV
435 static ssize_t sriov_totalvfs_show(struct device *dev,
436 struct device_attribute *attr,
439 struct pci_dev *pdev = to_pci_dev(dev);
441 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
445 static ssize_t sriov_numvfs_show(struct device *dev,
446 struct device_attribute *attr,
449 struct pci_dev *pdev = to_pci_dev(dev);
451 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
455 * num_vfs > 0; number of VFs to enable
456 * num_vfs = 0; disable all VFs
458 * Note: SRIOV spec doesn't allow partial VF
459 * disable, so it's all or none.
461 static ssize_t sriov_numvfs_store(struct device *dev,
462 struct device_attribute *attr,
463 const char *buf, size_t count)
465 struct pci_dev *pdev = to_pci_dev(dev);
469 ret = kstrtou16(buf, 0, &num_vfs);
473 if (num_vfs > pci_sriov_get_totalvfs(pdev))
476 if (num_vfs == pdev->sriov->num_VFs)
477 return count; /* no change */
479 /* is PF driver loaded w/callback */
480 if (!pdev->driver || !pdev->driver->sriov_configure) {
481 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
487 ret = pdev->driver->sriov_configure(pdev, 0);
494 if (pdev->sriov->num_VFs) {
495 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
496 pdev->sriov->num_VFs, num_vfs);
500 ret = pdev->driver->sriov_configure(pdev, num_vfs);
505 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
511 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
512 static struct device_attribute sriov_numvfs_attr =
513 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
514 sriov_numvfs_show, sriov_numvfs_store);
515 #endif /* CONFIG_PCI_IOV */
517 static ssize_t driver_override_store(struct device *dev,
518 struct device_attribute *attr,
519 const char *buf, size_t count)
521 struct pci_dev *pdev = to_pci_dev(dev);
522 char *driver_override, *old = pdev->driver_override, *cp;
524 /* We need to keep extra room for a newline */
525 if (count >= (PAGE_SIZE - 1))
528 driver_override = kstrndup(buf, count, GFP_KERNEL);
529 if (!driver_override)
532 cp = strchr(driver_override, '\n');
536 if (strlen(driver_override)) {
537 pdev->driver_override = driver_override;
539 kfree(driver_override);
540 pdev->driver_override = NULL;
548 static ssize_t driver_override_show(struct device *dev,
549 struct device_attribute *attr, char *buf)
551 struct pci_dev *pdev = to_pci_dev(dev);
553 return snprintf(buf, PAGE_SIZE, "%s\n", pdev->driver_override);
555 static DEVICE_ATTR_RW(driver_override);
557 static struct attribute *pci_dev_attrs[] = {
558 &dev_attr_resource.attr,
559 &dev_attr_vendor.attr,
560 &dev_attr_device.attr,
561 &dev_attr_subsystem_vendor.attr,
562 &dev_attr_subsystem_device.attr,
563 &dev_attr_class.attr,
565 &dev_attr_local_cpus.attr,
566 &dev_attr_local_cpulist.attr,
567 &dev_attr_modalias.attr,
569 &dev_attr_numa_node.attr,
571 &dev_attr_dma_mask_bits.attr,
572 &dev_attr_consistent_dma_mask_bits.attr,
573 &dev_attr_enable.attr,
574 &dev_attr_broken_parity_status.attr,
575 &dev_attr_msi_bus.attr,
576 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
577 &dev_attr_d3cold_allowed.attr,
580 &dev_attr_devspec.attr,
582 &dev_attr_driver_override.attr,
586 static const struct attribute_group pci_dev_group = {
587 .attrs = pci_dev_attrs,
590 const struct attribute_group *pci_dev_groups[] = {
595 static struct attribute *pcibus_attrs[] = {
596 &dev_attr_rescan.attr,
597 &dev_attr_cpuaffinity.attr,
598 &dev_attr_cpulistaffinity.attr,
602 static const struct attribute_group pcibus_group = {
603 .attrs = pcibus_attrs,
606 const struct attribute_group *pcibus_groups[] = {
611 static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr,
614 struct pci_dev *pdev = to_pci_dev(dev);
615 struct pci_dev *vga_dev = vga_default_device();
618 return sprintf(buf, "%u\n", (pdev == vga_dev));
620 return sprintf(buf, "%u\n",
621 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
622 IORESOURCE_ROM_SHADOW));
624 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
626 static ssize_t pci_read_config(struct file *filp, struct kobject *kobj,
627 struct bin_attribute *bin_attr, char *buf,
628 loff_t off, size_t count)
630 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device,
632 unsigned int size = 64;
633 loff_t init_off = off;
634 u8 *data = (u8 *) buf;
636 /* Several chips lock up trying to read undefined config space */
637 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0)
638 size = dev->cfg_size;
639 else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
644 if (off + count > size) {
651 pci_config_pm_runtime_get(dev);
653 if ((off & 1) && size) {
655 pci_user_read_config_byte(dev, off, &val);
656 data[off - init_off] = val;
661 if ((off & 3) && size > 2) {
663 pci_user_read_config_word(dev, off, &val);
664 data[off - init_off] = val & 0xff;
665 data[off - init_off + 1] = (val >> 8) & 0xff;
672 pci_user_read_config_dword(dev, off, &val);
673 data[off - init_off] = val & 0xff;
674 data[off - init_off + 1] = (val >> 8) & 0xff;
675 data[off - init_off + 2] = (val >> 16) & 0xff;
676 data[off - init_off + 3] = (val >> 24) & 0xff;
683 pci_user_read_config_word(dev, off, &val);
684 data[off - init_off] = val & 0xff;
685 data[off - init_off + 1] = (val >> 8) & 0xff;
692 pci_user_read_config_byte(dev, off, &val);
693 data[off - init_off] = val;
698 pci_config_pm_runtime_put(dev);
703 static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
704 struct bin_attribute *bin_attr, char *buf,
705 loff_t off, size_t count)
707 struct pci_dev *dev = to_pci_dev(container_of(kobj, struct device,
709 unsigned int size = count;
710 loff_t init_off = off;
711 u8 *data = (u8 *) buf;
713 if (off > dev->cfg_size)
715 if (off + count > dev->cfg_size) {
716 size = dev->cfg_size - off;
720 pci_config_pm_runtime_get(dev);
722 if ((off & 1) && size) {
723 pci_user_write_config_byte(dev, off, data[off - init_off]);
728 if ((off & 3) && size > 2) {
729 u16 val = data[off - init_off];
730 val |= (u16) data[off - init_off + 1] << 8;
731 pci_user_write_config_word(dev, off, val);
737 u32 val = data[off - init_off];
738 val |= (u32) data[off - init_off + 1] << 8;
739 val |= (u32) data[off - init_off + 2] << 16;
740 val |= (u32) data[off - init_off + 3] << 24;
741 pci_user_write_config_dword(dev, off, val);
747 u16 val = data[off - init_off];
748 val |= (u16) data[off - init_off + 1] << 8;
749 pci_user_write_config_word(dev, off, val);
755 pci_user_write_config_byte(dev, off, data[off - init_off]);
760 pci_config_pm_runtime_put(dev);
765 static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
766 struct bin_attribute *bin_attr, char *buf,
767 loff_t off, size_t count)
769 struct pci_dev *dev =
770 to_pci_dev(container_of(kobj, struct device, kobj));
772 if (off > bin_attr->size)
774 else if (count > bin_attr->size - off)
775 count = bin_attr->size - off;
777 return pci_read_vpd(dev, off, count, buf);
780 static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
781 struct bin_attribute *bin_attr, char *buf,
782 loff_t off, size_t count)
784 struct pci_dev *dev =
785 to_pci_dev(container_of(kobj, struct device, kobj));
787 if (off > bin_attr->size)
789 else if (count > bin_attr->size - off)
790 count = bin_attr->size - off;
792 return pci_write_vpd(dev, off, count, buf);
795 #ifdef HAVE_PCI_LEGACY
797 * pci_read_legacy_io - read byte(s) from legacy I/O port space
798 * @filp: open sysfs file
799 * @kobj: kobject corresponding to file to read from
800 * @bin_attr: struct bin_attribute for this file
801 * @buf: buffer to store results
802 * @off: offset into legacy I/O port space
803 * @count: number of bytes to read
805 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
806 * callback routine (pci_legacy_read).
808 static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj,
809 struct bin_attribute *bin_attr, char *buf,
810 loff_t off, size_t count)
812 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
815 /* Only support 1, 2 or 4 byte accesses */
816 if (count != 1 && count != 2 && count != 4)
819 return pci_legacy_read(bus, off, (u32 *)buf, count);
823 * pci_write_legacy_io - write byte(s) to legacy I/O port space
824 * @filp: open sysfs file
825 * @kobj: kobject corresponding to file to read from
826 * @bin_attr: struct bin_attribute for this file
827 * @buf: buffer containing value to be written
828 * @off: offset into legacy I/O port space
829 * @count: number of bytes to write
831 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
832 * callback routine (pci_legacy_write).
834 static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj,
835 struct bin_attribute *bin_attr, char *buf,
836 loff_t off, size_t count)
838 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
841 /* Only support 1, 2 or 4 byte accesses */
842 if (count != 1 && count != 2 && count != 4)
845 return pci_legacy_write(bus, off, *(u32 *)buf, count);
849 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
850 * @filp: open sysfs file
851 * @kobj: kobject corresponding to device to be mapped
852 * @attr: struct bin_attribute for this file
853 * @vma: struct vm_area_struct passed to mmap
855 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
856 * legacy memory space (first meg of bus space) into application virtual
859 static int pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
860 struct bin_attribute *attr,
861 struct vm_area_struct *vma)
863 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
866 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
870 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
871 * @filp: open sysfs file
872 * @kobj: kobject corresponding to device to be mapped
873 * @attr: struct bin_attribute for this file
874 * @vma: struct vm_area_struct passed to mmap
876 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
877 * legacy IO space (first meg of bus space) into application virtual
878 * memory space. Returns -ENOSYS if the operation isn't supported
880 static int pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
881 struct bin_attribute *attr,
882 struct vm_area_struct *vma)
884 struct pci_bus *bus = to_pci_bus(container_of(kobj, struct device,
887 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
891 * pci_adjust_legacy_attr - adjustment of legacy file attributes
892 * @b: bus to create files under
893 * @mmap_type: I/O port or memory
895 * Stub implementation. Can be overridden by arch if necessary.
897 void __weak pci_adjust_legacy_attr(struct pci_bus *b,
898 enum pci_mmap_state mmap_type)
903 * pci_create_legacy_files - create legacy I/O port and memory files
904 * @b: bus to create files under
906 * Some platforms allow access to legacy I/O port and ISA memory space on
907 * a per-bus basis. This routine creates the files and ties them into
908 * their associated read, write and mmap files from pci-sysfs.c
910 * On error unwind, but don't propagate the error to the caller
911 * as it is ok to set up the PCI bus without these files.
913 void pci_create_legacy_files(struct pci_bus *b)
917 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
922 sysfs_bin_attr_init(b->legacy_io);
923 b->legacy_io->attr.name = "legacy_io";
924 b->legacy_io->size = 0xffff;
925 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
926 b->legacy_io->read = pci_read_legacy_io;
927 b->legacy_io->write = pci_write_legacy_io;
928 b->legacy_io->mmap = pci_mmap_legacy_io;
929 pci_adjust_legacy_attr(b, pci_mmap_io);
930 error = device_create_bin_file(&b->dev, b->legacy_io);
934 /* Allocated above after the legacy_io struct */
935 b->legacy_mem = b->legacy_io + 1;
936 sysfs_bin_attr_init(b->legacy_mem);
937 b->legacy_mem->attr.name = "legacy_mem";
938 b->legacy_mem->size = 1024*1024;
939 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
940 b->legacy_mem->mmap = pci_mmap_legacy_mem;
941 pci_adjust_legacy_attr(b, pci_mmap_mem);
942 error = device_create_bin_file(&b->dev, b->legacy_mem);
949 device_remove_bin_file(&b->dev, b->legacy_io);
954 printk(KERN_WARNING "pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
958 void pci_remove_legacy_files(struct pci_bus *b)
961 device_remove_bin_file(&b->dev, b->legacy_io);
962 device_remove_bin_file(&b->dev, b->legacy_mem);
963 kfree(b->legacy_io); /* both are allocated here */
966 #endif /* HAVE_PCI_LEGACY */
970 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
971 enum pci_mmap_api mmap_api)
973 unsigned long nr, start, size, pci_start;
975 if (pci_resource_len(pdev, resno) == 0)
978 start = vma->vm_pgoff;
979 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
980 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
981 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
982 if (start >= pci_start && start < pci_start + size &&
983 start + nr <= pci_start + size)
989 * pci_mmap_resource - map a PCI resource into user memory space
990 * @kobj: kobject for mapping
991 * @attr: struct bin_attribute for the file being mapped
992 * @vma: struct vm_area_struct passed into the mmap
993 * @write_combine: 1 for write_combine mapping
995 * Use the regular PCI mapping routines to map a PCI resource into userspace.
997 static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
998 struct vm_area_struct *vma, int write_combine)
1000 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1001 struct device, kobj));
1002 struct resource *res = attr->private;
1003 enum pci_mmap_state mmap_type;
1004 resource_size_t start, end;
1007 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1008 if (res == &pdev->resource[i])
1010 if (i >= PCI_ROM_RESOURCE)
1013 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
1014 WARN(1, "process \"%s\" tried to map 0x%08lx bytes at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
1015 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
1017 (u64)pci_resource_start(pdev, i),
1018 (u64)pci_resource_len(pdev, i));
1022 /* pci_mmap_page_range() expects the same kind of entry as coming
1023 * from /proc/bus/pci/ which is a "user visible" value. If this is
1024 * different from the resource itself, arch will do necessary fixup.
1026 pci_resource_to_user(pdev, i, res, &start, &end);
1027 vma->vm_pgoff += start >> PAGE_SHIFT;
1028 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1030 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
1033 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1036 static int pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1037 struct bin_attribute *attr,
1038 struct vm_area_struct *vma)
1040 return pci_mmap_resource(kobj, attr, vma, 0);
1043 static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1044 struct bin_attribute *attr,
1045 struct vm_area_struct *vma)
1047 return pci_mmap_resource(kobj, attr, vma, 1);
1050 static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
1051 struct bin_attribute *attr, char *buf,
1052 loff_t off, size_t count, bool write)
1054 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1055 struct device, kobj));
1056 struct resource *res = attr->private;
1057 unsigned long port = off;
1060 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1061 if (res == &pdev->resource[i])
1063 if (i >= PCI_ROM_RESOURCE)
1066 port += pci_resource_start(pdev, i);
1068 if (port > pci_resource_end(pdev, i))
1071 if (port + count - 1 > pci_resource_end(pdev, i))
1077 outb(*(u8 *)buf, port);
1079 *(u8 *)buf = inb(port);
1083 outw(*(u16 *)buf, port);
1085 *(u16 *)buf = inw(port);
1089 outl(*(u32 *)buf, port);
1091 *(u32 *)buf = inl(port);
1097 static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
1098 struct bin_attribute *attr, char *buf,
1099 loff_t off, size_t count)
1101 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1104 static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
1105 struct bin_attribute *attr, char *buf,
1106 loff_t off, size_t count)
1108 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1112 * pci_remove_resource_files - cleanup resource files
1113 * @pdev: dev to cleanup
1115 * If we created resource files for @pdev, remove them from sysfs and
1116 * free their resources.
1118 static void pci_remove_resource_files(struct pci_dev *pdev)
1122 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1123 struct bin_attribute *res_attr;
1125 res_attr = pdev->res_attr[i];
1127 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1131 res_attr = pdev->res_attr_wc[i];
1133 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1139 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1141 /* allocate attribute structure, piggyback attribute name */
1142 int name_len = write_combine ? 13 : 10;
1143 struct bin_attribute *res_attr;
1146 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1148 char *res_attr_name = (char *)(res_attr + 1);
1150 sysfs_bin_attr_init(res_attr);
1151 if (write_combine) {
1152 pdev->res_attr_wc[num] = res_attr;
1153 sprintf(res_attr_name, "resource%d_wc", num);
1154 res_attr->mmap = pci_mmap_resource_wc;
1156 pdev->res_attr[num] = res_attr;
1157 sprintf(res_attr_name, "resource%d", num);
1158 res_attr->mmap = pci_mmap_resource_uc;
1160 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1161 res_attr->read = pci_read_resource_io;
1162 res_attr->write = pci_write_resource_io;
1164 res_attr->attr.name = res_attr_name;
1165 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1166 res_attr->size = pci_resource_len(pdev, num);
1167 res_attr->private = &pdev->resource[num];
1168 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1176 * pci_create_resource_files - create resource files in sysfs for @dev
1177 * @pdev: dev in question
1179 * Walk the resources in @pdev creating files for each resource available.
1181 static int pci_create_resource_files(struct pci_dev *pdev)
1186 /* Expose the PCI resources from this device as files */
1187 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1189 /* skip empty resources */
1190 if (!pci_resource_len(pdev, i))
1193 retval = pci_create_attr(pdev, i, 0);
1194 /* for prefetchable resources, create a WC mappable file */
1195 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1196 retval = pci_create_attr(pdev, i, 1);
1199 pci_remove_resource_files(pdev);
1205 #else /* !HAVE_PCI_MMAP */
1206 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1207 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1208 #endif /* HAVE_PCI_MMAP */
1211 * pci_write_rom - used to enable access to the PCI ROM display
1213 * @kobj: kernel object handle
1214 * @bin_attr: struct bin_attribute for this file
1217 * @count: number of byte in input
1219 * writing anything except 0 enables it
1221 static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj,
1222 struct bin_attribute *bin_attr, char *buf,
1223 loff_t off, size_t count)
1225 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1227 if ((off == 0) && (*buf == '0') && (count == 2))
1228 pdev->rom_attr_enabled = 0;
1230 pdev->rom_attr_enabled = 1;
1236 * pci_read_rom - read a PCI ROM
1238 * @kobj: kernel object handle
1239 * @bin_attr: struct bin_attribute for this file
1240 * @buf: where to put the data we read from the ROM
1242 * @count: number of bytes to read
1244 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1245 * device corresponding to @kobj.
1247 static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj,
1248 struct bin_attribute *bin_attr, char *buf,
1249 loff_t off, size_t count)
1251 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1255 if (!pdev->rom_attr_enabled)
1258 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1265 if (off + count > size)
1268 memcpy_fromio(buf, rom + off, count);
1270 pci_unmap_rom(pdev, rom);
1275 static struct bin_attribute pci_config_attr = {
1278 .mode = S_IRUGO | S_IWUSR,
1280 .size = PCI_CFG_SPACE_SIZE,
1281 .read = pci_read_config,
1282 .write = pci_write_config,
1285 static struct bin_attribute pcie_config_attr = {
1288 .mode = S_IRUGO | S_IWUSR,
1290 .size = PCI_CFG_SPACE_EXP_SIZE,
1291 .read = pci_read_config,
1292 .write = pci_write_config,
1295 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
1296 const char *buf, size_t count)
1298 struct pci_dev *pdev = to_pci_dev(dev);
1300 ssize_t result = kstrtoul(buf, 0, &val);
1308 result = pci_reset_function(pdev);
1315 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1317 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1320 struct bin_attribute *attr;
1322 /* If the device has VPD, try to expose it in sysfs. */
1324 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1328 sysfs_bin_attr_init(attr);
1329 attr->size = dev->vpd->len;
1330 attr->attr.name = "vpd";
1331 attr->attr.mode = S_IRUSR | S_IWUSR;
1332 attr->read = read_vpd_attr;
1333 attr->write = write_vpd_attr;
1334 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1339 dev->vpd->attr = attr;
1342 /* Active State Power Management */
1343 pcie_aspm_create_sysfs_dev_files(dev);
1345 if (!pci_probe_reset_function(dev)) {
1346 retval = device_create_file(&dev->dev, &reset_attr);
1354 pcie_aspm_remove_sysfs_dev_files(dev);
1355 if (dev->vpd && dev->vpd->attr) {
1356 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1357 kfree(dev->vpd->attr);
1363 int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
1367 struct bin_attribute *attr;
1369 if (!sysfs_initialized)
1372 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1373 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1375 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1379 retval = pci_create_resource_files(pdev);
1381 goto err_config_file;
1383 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1384 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1385 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1388 /* If the device has a ROM, try to expose it in sysfs. */
1390 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1393 goto err_resource_files;
1395 sysfs_bin_attr_init(attr);
1396 attr->size = rom_size;
1397 attr->attr.name = "rom";
1398 attr->attr.mode = S_IRUSR | S_IWUSR;
1399 attr->read = pci_read_rom;
1400 attr->write = pci_write_rom;
1401 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1404 goto err_resource_files;
1406 pdev->rom_attr = attr;
1409 /* add sysfs entries for various capabilities */
1410 retval = pci_create_capabilities_sysfs(pdev);
1414 pci_create_firmware_label_files(pdev);
1420 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1421 kfree(pdev->rom_attr);
1422 pdev->rom_attr = NULL;
1425 pci_remove_resource_files(pdev);
1427 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1428 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1430 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1435 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1437 if (dev->vpd && dev->vpd->attr) {
1438 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1439 kfree(dev->vpd->attr);
1442 pcie_aspm_remove_sysfs_dev_files(dev);
1443 if (dev->reset_fn) {
1444 device_remove_file(&dev->dev, &reset_attr);
1450 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1451 * @pdev: device whose entries we should free
1453 * Cleanup when @pdev is removed from sysfs.
1455 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1459 if (!sysfs_initialized)
1462 pci_remove_capabilities_sysfs(pdev);
1464 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1465 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1467 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1469 pci_remove_resource_files(pdev);
1471 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1472 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1473 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1476 if (rom_size && pdev->rom_attr) {
1477 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1478 kfree(pdev->rom_attr);
1481 pci_remove_firmware_label_files(pdev);
1485 static int __init pci_sysfs_init(void)
1487 struct pci_dev *pdev = NULL;
1490 sysfs_initialized = 1;
1491 for_each_pci_dev(pdev) {
1492 retval = pci_create_sysfs_dev_files(pdev);
1501 late_initcall(pci_sysfs_init);
1503 static struct attribute *pci_dev_dev_attrs[] = {
1508 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1509 struct attribute *a, int n)
1511 struct device *dev = container_of(kobj, struct device, kobj);
1512 struct pci_dev *pdev = to_pci_dev(dev);
1514 if (a == &vga_attr.attr)
1515 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1521 static struct attribute *pci_dev_hp_attrs[] = {
1522 &dev_remove_attr.attr,
1523 &dev_rescan_attr.attr,
1527 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1528 struct attribute *a, int n)
1530 struct device *dev = container_of(kobj, struct device, kobj);
1531 struct pci_dev *pdev = to_pci_dev(dev);
1533 if (pdev->is_virtfn)
1539 static struct attribute_group pci_dev_hp_attr_group = {
1540 .attrs = pci_dev_hp_attrs,
1541 .is_visible = pci_dev_hp_attrs_are_visible,
1544 #ifdef CONFIG_PCI_IOV
1545 static struct attribute *sriov_dev_attrs[] = {
1546 &sriov_totalvfs_attr.attr,
1547 &sriov_numvfs_attr.attr,
1551 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1552 struct attribute *a, int n)
1554 struct device *dev = container_of(kobj, struct device, kobj);
1556 if (!dev_is_pf(dev))
1562 static struct attribute_group sriov_dev_attr_group = {
1563 .attrs = sriov_dev_attrs,
1564 .is_visible = sriov_attrs_are_visible,
1566 #endif /* CONFIG_PCI_IOV */
1568 static struct attribute_group pci_dev_attr_group = {
1569 .attrs = pci_dev_dev_attrs,
1570 .is_visible = pci_dev_attrs_are_visible,
1573 static const struct attribute_group *pci_dev_attr_groups[] = {
1574 &pci_dev_attr_group,
1575 &pci_dev_hp_attr_group,
1576 #ifdef CONFIG_PCI_IOV
1577 &sriov_dev_attr_group,
1582 struct device_type pci_dev_type = {
1583 .groups = pci_dev_attr_groups,