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>
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 sprintf (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(class, "0x%06x\n");
53 pci_config_attr(irq, "%u\n");
55 static ssize_t broken_parity_status_show(struct device *dev,
56 struct device_attribute *attr,
59 struct pci_dev *pdev = to_pci_dev(dev);
60 return sprintf (buf, "%u\n", pdev->broken_parity_status);
63 static ssize_t broken_parity_status_store(struct device *dev,
64 struct device_attribute *attr,
65 const char *buf, size_t count)
67 struct pci_dev *pdev = to_pci_dev(dev);
70 if (kstrtoul(buf, 0, &val) < 0)
73 pdev->broken_parity_status = !!val;
77 static DEVICE_ATTR_RW(broken_parity_status);
79 static ssize_t pci_dev_show_local_cpu(struct device *dev,
81 struct device_attribute *attr,
84 const struct cpumask *mask;
88 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
89 cpumask_of_node(dev_to_node(dev));
91 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
94 cpumask_scnprintf(buf, PAGE_SIZE-2, mask) :
95 cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
102 static ssize_t local_cpus_show(struct device *dev,
103 struct device_attribute *attr, char *buf)
105 return pci_dev_show_local_cpu(dev, 1, attr, buf);
107 static DEVICE_ATTR_RO(local_cpus);
109 static ssize_t local_cpulist_show(struct device *dev,
110 struct device_attribute *attr, char *buf)
112 return pci_dev_show_local_cpu(dev, 0, attr, buf);
114 static DEVICE_ATTR_RO(local_cpulist);
117 * PCI Bus Class Devices
119 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
121 struct device_attribute *attr,
125 const struct cpumask *cpumask;
127 cpumask = cpumask_of_pcibus(to_pci_bus(dev));
129 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
130 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
136 static ssize_t cpuaffinity_show(struct device *dev,
137 struct device_attribute *attr, char *buf)
139 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
141 static DEVICE_ATTR_RO(cpuaffinity);
143 static ssize_t cpulistaffinity_show(struct device *dev,
144 struct device_attribute *attr, char *buf)
146 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
148 static DEVICE_ATTR_RO(cpulistaffinity);
152 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
154 struct pci_dev * pci_dev = to_pci_dev(dev);
158 resource_size_t start, end;
160 if (pci_dev->subordinate)
161 max = DEVICE_COUNT_RESOURCE;
163 max = PCI_BRIDGE_RESOURCES;
165 for (i = 0; i < max; i++) {
166 struct resource *res = &pci_dev->resource[i];
167 pci_resource_to_user(pci_dev, i, res, &start, &end);
168 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
169 (unsigned long long)start,
170 (unsigned long long)end,
171 (unsigned long long)res->flags);
175 static DEVICE_ATTR_RO(resource);
177 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
179 struct pci_dev *pci_dev = to_pci_dev(dev);
181 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
182 pci_dev->vendor, pci_dev->device,
183 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
184 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
185 (u8)(pci_dev->class));
187 static DEVICE_ATTR_RO(modalias);
189 static ssize_t enabled_store(struct device *dev,
190 struct device_attribute *attr, const char *buf,
193 struct pci_dev *pdev = to_pci_dev(dev);
195 ssize_t result = kstrtoul(buf, 0, &val);
200 /* this can crash the machine when done on the "wrong" device */
201 if (!capable(CAP_SYS_ADMIN))
205 if (pci_is_enabled(pdev))
206 pci_disable_device(pdev);
210 result = pci_enable_device(pdev);
212 return result < 0 ? result : count;
215 static ssize_t enabled_show(struct device *dev,
216 struct device_attribute *attr, char *buf)
218 struct pci_dev *pdev;
220 pdev = to_pci_dev (dev);
221 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
223 static DEVICE_ATTR_RW(enabled);
227 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
229 return sprintf (buf, "%d\n", dev->numa_node);
231 static DEVICE_ATTR_RO(numa_node);
235 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
237 struct pci_dev *pdev = to_pci_dev(dev);
239 return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
241 static DEVICE_ATTR_RO(dma_mask_bits);
244 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
247 return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
249 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
252 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
254 struct pci_dev *pdev = to_pci_dev(dev);
256 if (!pdev->subordinate)
259 return sprintf (buf, "%u\n",
260 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
264 msi_bus_store(struct device *dev, struct device_attribute *attr,
265 const char *buf, size_t count)
267 struct pci_dev *pdev = to_pci_dev(dev);
270 if (kstrtoul(buf, 0, &val) < 0)
274 * Bad things may happen if the no_msi flag is changed
275 * while drivers are loaded.
277 if (!capable(CAP_SYS_ADMIN))
281 * Maybe devices without subordinate buses shouldn't have this
282 * attribute in the first place?
284 if (!pdev->subordinate)
287 /* Is the flag going to change, or keep the value it already had? */
288 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
290 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
292 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
293 " bad things could happen\n", val ? "" : " not");
298 static DEVICE_ATTR_RW(msi_bus);
300 static DEFINE_MUTEX(pci_remove_rescan_mutex);
301 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
305 struct pci_bus *b = NULL;
307 if (kstrtoul(buf, 0, &val) < 0)
311 mutex_lock(&pci_remove_rescan_mutex);
312 while ((b = pci_find_next_bus(b)) != NULL)
314 mutex_unlock(&pci_remove_rescan_mutex);
318 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
320 static struct attribute *pci_bus_attrs[] = {
321 &bus_attr_rescan.attr,
325 static const struct attribute_group pci_bus_group = {
326 .attrs = pci_bus_attrs,
329 const struct attribute_group *pci_bus_groups[] = {
335 dev_rescan_store(struct device *dev, struct device_attribute *attr,
336 const char *buf, size_t count)
339 struct pci_dev *pdev = to_pci_dev(dev);
341 if (kstrtoul(buf, 0, &val) < 0)
345 mutex_lock(&pci_remove_rescan_mutex);
346 pci_rescan_bus(pdev->bus);
347 mutex_unlock(&pci_remove_rescan_mutex);
351 static struct device_attribute dev_rescan_attr = __ATTR(rescan,
353 NULL, dev_rescan_store);
356 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 mutex_lock(&pci_remove_rescan_mutex);
366 pci_stop_and_remove_bus_device(to_pci_dev(dev));
367 mutex_unlock(&pci_remove_rescan_mutex);
371 static struct device_attribute dev_remove_attr = __ATTR(remove,
376 dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
377 const char *buf, size_t count)
380 struct pci_bus *bus = to_pci_bus(dev);
382 if (kstrtoul(buf, 0, &val) < 0)
386 mutex_lock(&pci_remove_rescan_mutex);
387 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
388 pci_rescan_bus_bridge_resize(bus->self);
391 mutex_unlock(&pci_remove_rescan_mutex);
395 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
397 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
398 static ssize_t d3cold_allowed_store(struct device *dev,
399 struct device_attribute *attr,
400 const char *buf, size_t count)
402 struct pci_dev *pdev = to_pci_dev(dev);
405 if (kstrtoul(buf, 0, &val) < 0)
408 pdev->d3cold_allowed = !!val;
409 pm_runtime_resume(dev);
414 static ssize_t d3cold_allowed_show(struct device *dev,
415 struct device_attribute *attr, char *buf)
417 struct pci_dev *pdev = to_pci_dev(dev);
418 return sprintf (buf, "%u\n", pdev->d3cold_allowed);
420 static DEVICE_ATTR_RW(d3cold_allowed);
423 #ifdef CONFIG_PCI_IOV
424 static ssize_t sriov_totalvfs_show(struct device *dev,
425 struct device_attribute *attr,
428 struct pci_dev *pdev = to_pci_dev(dev);
430 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
434 static ssize_t sriov_numvfs_show(struct device *dev,
435 struct device_attribute *attr,
438 struct pci_dev *pdev = to_pci_dev(dev);
440 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
444 * num_vfs > 0; number of VFs to enable
445 * num_vfs = 0; disable all VFs
447 * Note: SRIOV spec doesn't allow partial VF
448 * disable, so it's all or none.
450 static ssize_t sriov_numvfs_store(struct device *dev,
451 struct device_attribute *attr,
452 const char *buf, size_t count)
454 struct pci_dev *pdev = to_pci_dev(dev);
458 ret = kstrtou16(buf, 0, &num_vfs);
462 if (num_vfs > pci_sriov_get_totalvfs(pdev))
465 if (num_vfs == pdev->sriov->num_VFs)
466 return count; /* no change */
468 /* is PF driver loaded w/callback */
469 if (!pdev->driver || !pdev->driver->sriov_configure) {
470 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
476 ret = pdev->driver->sriov_configure(pdev, 0);
483 if (pdev->sriov->num_VFs) {
484 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
485 pdev->sriov->num_VFs, num_vfs);
489 ret = pdev->driver->sriov_configure(pdev, num_vfs);
494 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
500 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
501 static struct device_attribute sriov_numvfs_attr =
502 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
503 sriov_numvfs_show, sriov_numvfs_store);
504 #endif /* CONFIG_PCI_IOV */
506 static struct attribute *pci_dev_attrs[] = {
507 &dev_attr_resource.attr,
508 &dev_attr_vendor.attr,
509 &dev_attr_device.attr,
510 &dev_attr_subsystem_vendor.attr,
511 &dev_attr_subsystem_device.attr,
512 &dev_attr_class.attr,
514 &dev_attr_local_cpus.attr,
515 &dev_attr_local_cpulist.attr,
516 &dev_attr_modalias.attr,
518 &dev_attr_numa_node.attr,
520 &dev_attr_dma_mask_bits.attr,
521 &dev_attr_consistent_dma_mask_bits.attr,
522 &dev_attr_enabled.attr,
523 &dev_attr_broken_parity_status.attr,
524 &dev_attr_msi_bus.attr,
525 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
526 &dev_attr_d3cold_allowed.attr,
531 static const struct attribute_group pci_dev_group = {
532 .attrs = pci_dev_attrs,
535 const struct attribute_group *pci_dev_groups[] = {
540 static struct attribute *pcibus_attrs[] = {
541 &dev_attr_rescan.attr,
542 &dev_attr_cpuaffinity.attr,
543 &dev_attr_cpulistaffinity.attr,
547 static const struct attribute_group pcibus_group = {
548 .attrs = pcibus_attrs,
551 const struct attribute_group *pcibus_groups[] = {
557 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
559 struct pci_dev *pdev = to_pci_dev(dev);
560 struct pci_dev *vga_dev = vga_default_device();
563 return sprintf(buf, "%u\n", (pdev == vga_dev));
565 return sprintf(buf, "%u\n",
566 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
567 IORESOURCE_ROM_SHADOW));
569 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
572 pci_read_config(struct file *filp, struct kobject *kobj,
573 struct bin_attribute *bin_attr,
574 char *buf, loff_t off, size_t count)
576 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
577 unsigned int size = 64;
578 loff_t init_off = off;
579 u8 *data = (u8*) buf;
581 /* Several chips lock up trying to read undefined config space */
582 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
583 size = dev->cfg_size;
584 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
590 if (off + count > size) {
597 pci_config_pm_runtime_get(dev);
599 if ((off & 1) && size) {
601 pci_user_read_config_byte(dev, off, &val);
602 data[off - init_off] = val;
607 if ((off & 3) && size > 2) {
609 pci_user_read_config_word(dev, off, &val);
610 data[off - init_off] = val & 0xff;
611 data[off - init_off + 1] = (val >> 8) & 0xff;
618 pci_user_read_config_dword(dev, off, &val);
619 data[off - init_off] = val & 0xff;
620 data[off - init_off + 1] = (val >> 8) & 0xff;
621 data[off - init_off + 2] = (val >> 16) & 0xff;
622 data[off - init_off + 3] = (val >> 24) & 0xff;
629 pci_user_read_config_word(dev, off, &val);
630 data[off - init_off] = val & 0xff;
631 data[off - init_off + 1] = (val >> 8) & 0xff;
638 pci_user_read_config_byte(dev, off, &val);
639 data[off - init_off] = val;
644 pci_config_pm_runtime_put(dev);
650 pci_write_config(struct file* filp, struct kobject *kobj,
651 struct bin_attribute *bin_attr,
652 char *buf, loff_t off, size_t count)
654 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
655 unsigned int size = count;
656 loff_t init_off = off;
657 u8 *data = (u8*) buf;
659 if (off > dev->cfg_size)
661 if (off + count > dev->cfg_size) {
662 size = dev->cfg_size - off;
666 pci_config_pm_runtime_get(dev);
668 if ((off & 1) && size) {
669 pci_user_write_config_byte(dev, off, data[off - init_off]);
674 if ((off & 3) && size > 2) {
675 u16 val = data[off - init_off];
676 val |= (u16) data[off - init_off + 1] << 8;
677 pci_user_write_config_word(dev, off, val);
683 u32 val = data[off - init_off];
684 val |= (u32) data[off - init_off + 1] << 8;
685 val |= (u32) data[off - init_off + 2] << 16;
686 val |= (u32) data[off - init_off + 3] << 24;
687 pci_user_write_config_dword(dev, off, val);
693 u16 val = data[off - init_off];
694 val |= (u16) data[off - init_off + 1] << 8;
695 pci_user_write_config_word(dev, off, val);
701 pci_user_write_config_byte(dev, off, data[off - init_off]);
706 pci_config_pm_runtime_put(dev);
712 read_vpd_attr(struct file *filp, struct kobject *kobj,
713 struct bin_attribute *bin_attr,
714 char *buf, loff_t off, size_t count)
716 struct pci_dev *dev =
717 to_pci_dev(container_of(kobj, struct device, kobj));
719 if (off > bin_attr->size)
721 else if (count > bin_attr->size - off)
722 count = bin_attr->size - off;
724 return pci_read_vpd(dev, off, count, buf);
728 write_vpd_attr(struct file *filp, struct kobject *kobj,
729 struct bin_attribute *bin_attr,
730 char *buf, loff_t off, size_t count)
732 struct pci_dev *dev =
733 to_pci_dev(container_of(kobj, struct device, kobj));
735 if (off > bin_attr->size)
737 else if (count > bin_attr->size - off)
738 count = bin_attr->size - off;
740 return pci_write_vpd(dev, off, count, buf);
743 #ifdef HAVE_PCI_LEGACY
745 * pci_read_legacy_io - read byte(s) from legacy I/O port space
746 * @filp: open sysfs file
747 * @kobj: kobject corresponding to file to read from
748 * @bin_attr: struct bin_attribute for this file
749 * @buf: buffer to store results
750 * @off: offset into legacy I/O port space
751 * @count: number of bytes to read
753 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
754 * callback routine (pci_legacy_read).
757 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
758 struct bin_attribute *bin_attr,
759 char *buf, loff_t off, size_t count)
761 struct pci_bus *bus = to_pci_bus(container_of(kobj,
765 /* Only support 1, 2 or 4 byte accesses */
766 if (count != 1 && count != 2 && count != 4)
769 return pci_legacy_read(bus, off, (u32 *)buf, count);
773 * pci_write_legacy_io - write byte(s) to legacy I/O port space
774 * @filp: open sysfs file
775 * @kobj: kobject corresponding to file to read from
776 * @bin_attr: struct bin_attribute for this file
777 * @buf: buffer containing value to be written
778 * @off: offset into legacy I/O port space
779 * @count: number of bytes to write
781 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
782 * callback routine (pci_legacy_write).
785 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
786 struct bin_attribute *bin_attr,
787 char *buf, loff_t off, size_t count)
789 struct pci_bus *bus = to_pci_bus(container_of(kobj,
792 /* Only support 1, 2 or 4 byte accesses */
793 if (count != 1 && count != 2 && count != 4)
796 return pci_legacy_write(bus, off, *(u32 *)buf, count);
800 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
801 * @filp: open sysfs file
802 * @kobj: kobject corresponding to device to be mapped
803 * @attr: struct bin_attribute for this file
804 * @vma: struct vm_area_struct passed to mmap
806 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
807 * legacy memory space (first meg of bus space) into application virtual
811 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
812 struct bin_attribute *attr,
813 struct vm_area_struct *vma)
815 struct pci_bus *bus = to_pci_bus(container_of(kobj,
819 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
823 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
824 * @filp: open sysfs file
825 * @kobj: kobject corresponding to device to be mapped
826 * @attr: struct bin_attribute for this file
827 * @vma: struct vm_area_struct passed to mmap
829 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
830 * legacy IO space (first meg of bus space) into application virtual
831 * memory space. Returns -ENOSYS if the operation isn't supported
834 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
835 struct bin_attribute *attr,
836 struct vm_area_struct *vma)
838 struct pci_bus *bus = to_pci_bus(container_of(kobj,
842 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
846 * pci_adjust_legacy_attr - adjustment of legacy file attributes
847 * @b: bus to create files under
848 * @mmap_type: I/O port or memory
850 * Stub implementation. Can be overridden by arch if necessary.
853 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
859 * pci_create_legacy_files - create legacy I/O port and memory files
860 * @b: bus to create files under
862 * Some platforms allow access to legacy I/O port and ISA memory space on
863 * a per-bus basis. This routine creates the files and ties them into
864 * their associated read, write and mmap files from pci-sysfs.c
866 * On error unwind, but don't propagate the error to the caller
867 * as it is ok to set up the PCI bus without these files.
869 void pci_create_legacy_files(struct pci_bus *b)
873 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
878 sysfs_bin_attr_init(b->legacy_io);
879 b->legacy_io->attr.name = "legacy_io";
880 b->legacy_io->size = 0xffff;
881 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
882 b->legacy_io->read = pci_read_legacy_io;
883 b->legacy_io->write = pci_write_legacy_io;
884 b->legacy_io->mmap = pci_mmap_legacy_io;
885 pci_adjust_legacy_attr(b, pci_mmap_io);
886 error = device_create_bin_file(&b->dev, b->legacy_io);
890 /* Allocated above after the legacy_io struct */
891 b->legacy_mem = b->legacy_io + 1;
892 sysfs_bin_attr_init(b->legacy_mem);
893 b->legacy_mem->attr.name = "legacy_mem";
894 b->legacy_mem->size = 1024*1024;
895 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
896 b->legacy_mem->mmap = pci_mmap_legacy_mem;
897 pci_adjust_legacy_attr(b, pci_mmap_mem);
898 error = device_create_bin_file(&b->dev, b->legacy_mem);
905 device_remove_bin_file(&b->dev, b->legacy_io);
910 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
911 "and ISA memory resources to sysfs\n");
915 void pci_remove_legacy_files(struct pci_bus *b)
918 device_remove_bin_file(&b->dev, b->legacy_io);
919 device_remove_bin_file(&b->dev, b->legacy_mem);
920 kfree(b->legacy_io); /* both are allocated here */
923 #endif /* HAVE_PCI_LEGACY */
927 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
928 enum pci_mmap_api mmap_api)
930 unsigned long nr, start, size, pci_start;
932 if (pci_resource_len(pdev, resno) == 0)
935 start = vma->vm_pgoff;
936 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
937 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
938 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
939 if (start >= pci_start && start < pci_start + size &&
940 start + nr <= pci_start + size)
946 * pci_mmap_resource - map a PCI resource into user memory space
947 * @kobj: kobject for mapping
948 * @attr: struct bin_attribute for the file being mapped
949 * @vma: struct vm_area_struct passed into the mmap
950 * @write_combine: 1 for write_combine mapping
952 * Use the regular PCI mapping routines to map a PCI resource into userspace.
955 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
956 struct vm_area_struct *vma, int write_combine)
958 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
959 struct device, kobj));
960 struct resource *res = attr->private;
961 enum pci_mmap_state mmap_type;
962 resource_size_t start, end;
965 for (i = 0; i < PCI_ROM_RESOURCE; i++)
966 if (res == &pdev->resource[i])
968 if (i >= PCI_ROM_RESOURCE)
971 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
972 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
973 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
974 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
976 (u64)pci_resource_start(pdev, i),
977 (u64)pci_resource_len(pdev, i));
981 /* pci_mmap_page_range() expects the same kind of entry as coming
982 * from /proc/bus/pci/ which is a "user visible" value. If this is
983 * different from the resource itself, arch will do necessary fixup.
985 pci_resource_to_user(pdev, i, res, &start, &end);
986 vma->vm_pgoff += start >> PAGE_SHIFT;
987 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
989 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
992 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
996 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
997 struct bin_attribute *attr,
998 struct vm_area_struct *vma)
1000 return pci_mmap_resource(kobj, attr, vma, 0);
1004 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1005 struct bin_attribute *attr,
1006 struct vm_area_struct *vma)
1008 return pci_mmap_resource(kobj, attr, vma, 1);
1012 pci_resource_io(struct file *filp, struct kobject *kobj,
1013 struct bin_attribute *attr, char *buf,
1014 loff_t off, size_t count, bool write)
1016 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1017 struct device, kobj));
1018 struct resource *res = attr->private;
1019 unsigned long port = off;
1022 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1023 if (res == &pdev->resource[i])
1025 if (i >= PCI_ROM_RESOURCE)
1028 port += pci_resource_start(pdev, i);
1030 if (port > pci_resource_end(pdev, i))
1033 if (port + count - 1 > pci_resource_end(pdev, i))
1039 outb(*(u8 *)buf, port);
1041 *(u8 *)buf = inb(port);
1045 outw(*(u16 *)buf, port);
1047 *(u16 *)buf = inw(port);
1051 outl(*(u32 *)buf, port);
1053 *(u32 *)buf = inl(port);
1060 pci_read_resource_io(struct file *filp, struct kobject *kobj,
1061 struct bin_attribute *attr, char *buf,
1062 loff_t off, size_t count)
1064 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1068 pci_write_resource_io(struct file *filp, struct kobject *kobj,
1069 struct bin_attribute *attr, char *buf,
1070 loff_t off, size_t count)
1072 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1076 * pci_remove_resource_files - cleanup resource files
1077 * @pdev: dev to cleanup
1079 * If we created resource files for @pdev, remove them from sysfs and
1080 * free their resources.
1083 pci_remove_resource_files(struct pci_dev *pdev)
1087 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1088 struct bin_attribute *res_attr;
1090 res_attr = pdev->res_attr[i];
1092 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1096 res_attr = pdev->res_attr_wc[i];
1098 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1104 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1106 /* allocate attribute structure, piggyback attribute name */
1107 int name_len = write_combine ? 13 : 10;
1108 struct bin_attribute *res_attr;
1111 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1113 char *res_attr_name = (char *)(res_attr + 1);
1115 sysfs_bin_attr_init(res_attr);
1116 if (write_combine) {
1117 pdev->res_attr_wc[num] = res_attr;
1118 sprintf(res_attr_name, "resource%d_wc", num);
1119 res_attr->mmap = pci_mmap_resource_wc;
1121 pdev->res_attr[num] = res_attr;
1122 sprintf(res_attr_name, "resource%d", num);
1123 res_attr->mmap = pci_mmap_resource_uc;
1125 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1126 res_attr->read = pci_read_resource_io;
1127 res_attr->write = pci_write_resource_io;
1129 res_attr->attr.name = res_attr_name;
1130 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1131 res_attr->size = pci_resource_len(pdev, num);
1132 res_attr->private = &pdev->resource[num];
1133 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1141 * pci_create_resource_files - create resource files in sysfs for @dev
1142 * @pdev: dev in question
1144 * Walk the resources in @pdev creating files for each resource available.
1146 static int pci_create_resource_files(struct pci_dev *pdev)
1151 /* Expose the PCI resources from this device as files */
1152 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1154 /* skip empty resources */
1155 if (!pci_resource_len(pdev, i))
1158 retval = pci_create_attr(pdev, i, 0);
1159 /* for prefetchable resources, create a WC mappable file */
1160 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1161 retval = pci_create_attr(pdev, i, 1);
1164 pci_remove_resource_files(pdev);
1170 #else /* !HAVE_PCI_MMAP */
1171 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1172 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1173 #endif /* HAVE_PCI_MMAP */
1176 * pci_write_rom - used to enable access to the PCI ROM display
1178 * @kobj: kernel object handle
1179 * @bin_attr: struct bin_attribute for this file
1182 * @count: number of byte in input
1184 * writing anything except 0 enables it
1187 pci_write_rom(struct file *filp, struct kobject *kobj,
1188 struct bin_attribute *bin_attr,
1189 char *buf, loff_t off, size_t count)
1191 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1193 if ((off == 0) && (*buf == '0') && (count == 2))
1194 pdev->rom_attr_enabled = 0;
1196 pdev->rom_attr_enabled = 1;
1202 * pci_read_rom - read a PCI ROM
1204 * @kobj: kernel object handle
1205 * @bin_attr: struct bin_attribute for this file
1206 * @buf: where to put the data we read from the ROM
1208 * @count: number of bytes to read
1210 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1211 * device corresponding to @kobj.
1214 pci_read_rom(struct file *filp, struct kobject *kobj,
1215 struct bin_attribute *bin_attr,
1216 char *buf, loff_t off, size_t count)
1218 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1222 if (!pdev->rom_attr_enabled)
1225 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1232 if (off + count > size)
1235 memcpy_fromio(buf, rom + off, count);
1237 pci_unmap_rom(pdev, rom);
1242 static struct bin_attribute pci_config_attr = {
1245 .mode = S_IRUGO | S_IWUSR,
1247 .size = PCI_CFG_SPACE_SIZE,
1248 .read = pci_read_config,
1249 .write = pci_write_config,
1252 static struct bin_attribute pcie_config_attr = {
1255 .mode = S_IRUGO | S_IWUSR,
1257 .size = PCI_CFG_SPACE_EXP_SIZE,
1258 .read = pci_read_config,
1259 .write = pci_write_config,
1262 int __weak pcibios_add_platform_entries(struct pci_dev *dev)
1267 static ssize_t reset_store(struct device *dev,
1268 struct device_attribute *attr, const char *buf,
1271 struct pci_dev *pdev = to_pci_dev(dev);
1273 ssize_t result = kstrtoul(buf, 0, &val);
1281 result = pci_reset_function(pdev);
1288 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1290 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1293 struct bin_attribute *attr;
1295 /* If the device has VPD, try to expose it in sysfs. */
1297 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1301 sysfs_bin_attr_init(attr);
1302 attr->size = dev->vpd->len;
1303 attr->attr.name = "vpd";
1304 attr->attr.mode = S_IRUSR | S_IWUSR;
1305 attr->read = read_vpd_attr;
1306 attr->write = write_vpd_attr;
1307 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1312 dev->vpd->attr = attr;
1315 /* Active State Power Management */
1316 pcie_aspm_create_sysfs_dev_files(dev);
1318 if (!pci_probe_reset_function(dev)) {
1319 retval = device_create_file(&dev->dev, &reset_attr);
1327 pcie_aspm_remove_sysfs_dev_files(dev);
1328 if (dev->vpd && dev->vpd->attr) {
1329 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1330 kfree(dev->vpd->attr);
1336 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1340 struct bin_attribute *attr;
1342 if (!sysfs_initialized)
1345 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1346 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1348 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1352 retval = pci_create_resource_files(pdev);
1354 goto err_config_file;
1356 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1357 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1358 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1361 /* If the device has a ROM, try to expose it in sysfs. */
1363 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1366 goto err_resource_files;
1368 sysfs_bin_attr_init(attr);
1369 attr->size = rom_size;
1370 attr->attr.name = "rom";
1371 attr->attr.mode = S_IRUSR | S_IWUSR;
1372 attr->read = pci_read_rom;
1373 attr->write = pci_write_rom;
1374 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1377 goto err_resource_files;
1379 pdev->rom_attr = attr;
1382 /* add platform-specific attributes */
1383 retval = pcibios_add_platform_entries(pdev);
1387 /* add sysfs entries for various capabilities */
1388 retval = pci_create_capabilities_sysfs(pdev);
1392 pci_create_firmware_label_files(pdev);
1398 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1399 kfree(pdev->rom_attr);
1400 pdev->rom_attr = NULL;
1403 pci_remove_resource_files(pdev);
1405 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1406 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1408 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1413 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1415 if (dev->vpd && dev->vpd->attr) {
1416 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1417 kfree(dev->vpd->attr);
1420 pcie_aspm_remove_sysfs_dev_files(dev);
1421 if (dev->reset_fn) {
1422 device_remove_file(&dev->dev, &reset_attr);
1428 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1429 * @pdev: device whose entries we should free
1431 * Cleanup when @pdev is removed from sysfs.
1433 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1437 if (!sysfs_initialized)
1440 pci_remove_capabilities_sysfs(pdev);
1442 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1443 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1445 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1447 pci_remove_resource_files(pdev);
1449 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1450 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1451 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1454 if (rom_size && pdev->rom_attr) {
1455 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1456 kfree(pdev->rom_attr);
1459 pci_remove_firmware_label_files(pdev);
1463 static int __init pci_sysfs_init(void)
1465 struct pci_dev *pdev = NULL;
1468 sysfs_initialized = 1;
1469 for_each_pci_dev(pdev) {
1470 retval = pci_create_sysfs_dev_files(pdev);
1480 late_initcall(pci_sysfs_init);
1482 static struct attribute *pci_dev_dev_attrs[] = {
1487 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1488 struct attribute *a, int n)
1490 struct device *dev = container_of(kobj, struct device, kobj);
1491 struct pci_dev *pdev = to_pci_dev(dev);
1493 if (a == &vga_attr.attr)
1494 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1500 static struct attribute *pci_dev_hp_attrs[] = {
1501 &dev_remove_attr.attr,
1502 &dev_rescan_attr.attr,
1506 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1507 struct attribute *a, int n)
1509 struct device *dev = container_of(kobj, struct device, kobj);
1510 struct pci_dev *pdev = to_pci_dev(dev);
1512 if (pdev->is_virtfn)
1518 static struct attribute_group pci_dev_hp_attr_group = {
1519 .attrs = pci_dev_hp_attrs,
1520 .is_visible = pci_dev_hp_attrs_are_visible,
1523 #ifdef CONFIG_PCI_IOV
1524 static struct attribute *sriov_dev_attrs[] = {
1525 &sriov_totalvfs_attr.attr,
1526 &sriov_numvfs_attr.attr,
1530 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1531 struct attribute *a, int n)
1533 struct device *dev = container_of(kobj, struct device, kobj);
1535 if (!dev_is_pf(dev))
1541 static struct attribute_group sriov_dev_attr_group = {
1542 .attrs = sriov_dev_attrs,
1543 .is_visible = sriov_attrs_are_visible,
1545 #endif /* CONFIG_PCI_IOV */
1547 static struct attribute_group pci_dev_attr_group = {
1548 .attrs = pci_dev_dev_attrs,
1549 .is_visible = pci_dev_attrs_are_visible,
1552 static const struct attribute_group *pci_dev_attr_groups[] = {
1553 &pci_dev_attr_group,
1554 &pci_dev_hp_attr_group,
1555 #ifdef CONFIG_PCI_IOV
1556 &sriov_dev_attr_group,
1561 struct device_type pci_dev_type = {
1562 .groups = pci_dev_attr_groups,