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);
355 static void remove_callback(struct device *dev)
357 struct pci_dev *pdev = to_pci_dev(dev);
359 mutex_lock(&pci_remove_rescan_mutex);
360 pci_stop_and_remove_bus_device(pdev);
361 mutex_unlock(&pci_remove_rescan_mutex);
365 remove_store(struct device *dev, struct device_attribute *dummy,
366 const char *buf, size_t count)
371 if (kstrtoul(buf, 0, &val) < 0)
374 /* An attribute cannot be unregistered by one of its own methods,
375 * so we have to use this roundabout approach.
378 ret = device_schedule_callback(dev, remove_callback);
383 static struct device_attribute dev_remove_attr = __ATTR(remove,
388 dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
389 const char *buf, size_t count)
392 struct pci_bus *bus = to_pci_bus(dev);
394 if (kstrtoul(buf, 0, &val) < 0)
398 mutex_lock(&pci_remove_rescan_mutex);
399 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
400 pci_rescan_bus_bridge_resize(bus->self);
403 mutex_unlock(&pci_remove_rescan_mutex);
407 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
409 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
410 static ssize_t d3cold_allowed_store(struct device *dev,
411 struct device_attribute *attr,
412 const char *buf, size_t count)
414 struct pci_dev *pdev = to_pci_dev(dev);
417 if (kstrtoul(buf, 0, &val) < 0)
420 pdev->d3cold_allowed = !!val;
421 pm_runtime_resume(dev);
426 static ssize_t d3cold_allowed_show(struct device *dev,
427 struct device_attribute *attr, char *buf)
429 struct pci_dev *pdev = to_pci_dev(dev);
430 return sprintf (buf, "%u\n", pdev->d3cold_allowed);
432 static DEVICE_ATTR_RW(d3cold_allowed);
435 #ifdef CONFIG_PCI_IOV
436 static ssize_t sriov_totalvfs_show(struct device *dev,
437 struct device_attribute *attr,
440 struct pci_dev *pdev = to_pci_dev(dev);
442 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
446 static ssize_t sriov_numvfs_show(struct device *dev,
447 struct device_attribute *attr,
450 struct pci_dev *pdev = to_pci_dev(dev);
452 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
456 * num_vfs > 0; number of VFs to enable
457 * num_vfs = 0; disable all VFs
459 * Note: SRIOV spec doesn't allow partial VF
460 * disable, so it's all or none.
462 static ssize_t sriov_numvfs_store(struct device *dev,
463 struct device_attribute *attr,
464 const char *buf, size_t count)
466 struct pci_dev *pdev = to_pci_dev(dev);
470 ret = kstrtou16(buf, 0, &num_vfs);
474 if (num_vfs > pci_sriov_get_totalvfs(pdev))
477 if (num_vfs == pdev->sriov->num_VFs)
478 return count; /* no change */
480 /* is PF driver loaded w/callback */
481 if (!pdev->driver || !pdev->driver->sriov_configure) {
482 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
488 ret = pdev->driver->sriov_configure(pdev, 0);
495 if (pdev->sriov->num_VFs) {
496 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
497 pdev->sriov->num_VFs, num_vfs);
501 ret = pdev->driver->sriov_configure(pdev, num_vfs);
506 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
512 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
513 static struct device_attribute sriov_numvfs_attr =
514 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
515 sriov_numvfs_show, sriov_numvfs_store);
516 #endif /* CONFIG_PCI_IOV */
518 static struct attribute *pci_dev_attrs[] = {
519 &dev_attr_resource.attr,
520 &dev_attr_vendor.attr,
521 &dev_attr_device.attr,
522 &dev_attr_subsystem_vendor.attr,
523 &dev_attr_subsystem_device.attr,
524 &dev_attr_class.attr,
526 &dev_attr_local_cpus.attr,
527 &dev_attr_local_cpulist.attr,
528 &dev_attr_modalias.attr,
530 &dev_attr_numa_node.attr,
532 &dev_attr_dma_mask_bits.attr,
533 &dev_attr_consistent_dma_mask_bits.attr,
534 &dev_attr_enabled.attr,
535 &dev_attr_broken_parity_status.attr,
536 &dev_attr_msi_bus.attr,
537 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
538 &dev_attr_d3cold_allowed.attr,
543 static const struct attribute_group pci_dev_group = {
544 .attrs = pci_dev_attrs,
547 const struct attribute_group *pci_dev_groups[] = {
552 static struct attribute *pcibus_attrs[] = {
553 &dev_attr_rescan.attr,
554 &dev_attr_cpuaffinity.attr,
555 &dev_attr_cpulistaffinity.attr,
559 static const struct attribute_group pcibus_group = {
560 .attrs = pcibus_attrs,
563 const struct attribute_group *pcibus_groups[] = {
569 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
571 struct pci_dev *pdev = to_pci_dev(dev);
572 struct pci_dev *vga_dev = vga_default_device();
575 return sprintf(buf, "%u\n", (pdev == vga_dev));
577 return sprintf(buf, "%u\n",
578 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
579 IORESOURCE_ROM_SHADOW));
581 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
584 pci_read_config(struct file *filp, struct kobject *kobj,
585 struct bin_attribute *bin_attr,
586 char *buf, loff_t off, size_t count)
588 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
589 unsigned int size = 64;
590 loff_t init_off = off;
591 u8 *data = (u8*) buf;
593 /* Several chips lock up trying to read undefined config space */
594 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
595 size = dev->cfg_size;
596 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
602 if (off + count > size) {
609 pci_config_pm_runtime_get(dev);
611 if ((off & 1) && size) {
613 pci_user_read_config_byte(dev, off, &val);
614 data[off - init_off] = val;
619 if ((off & 3) && size > 2) {
621 pci_user_read_config_word(dev, off, &val);
622 data[off - init_off] = val & 0xff;
623 data[off - init_off + 1] = (val >> 8) & 0xff;
630 pci_user_read_config_dword(dev, off, &val);
631 data[off - init_off] = val & 0xff;
632 data[off - init_off + 1] = (val >> 8) & 0xff;
633 data[off - init_off + 2] = (val >> 16) & 0xff;
634 data[off - init_off + 3] = (val >> 24) & 0xff;
641 pci_user_read_config_word(dev, off, &val);
642 data[off - init_off] = val & 0xff;
643 data[off - init_off + 1] = (val >> 8) & 0xff;
650 pci_user_read_config_byte(dev, off, &val);
651 data[off - init_off] = val;
656 pci_config_pm_runtime_put(dev);
662 pci_write_config(struct file* filp, struct kobject *kobj,
663 struct bin_attribute *bin_attr,
664 char *buf, loff_t off, size_t count)
666 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
667 unsigned int size = count;
668 loff_t init_off = off;
669 u8 *data = (u8*) buf;
671 if (off > dev->cfg_size)
673 if (off + count > dev->cfg_size) {
674 size = dev->cfg_size - off;
678 pci_config_pm_runtime_get(dev);
680 if ((off & 1) && size) {
681 pci_user_write_config_byte(dev, off, data[off - init_off]);
686 if ((off & 3) && size > 2) {
687 u16 val = data[off - init_off];
688 val |= (u16) data[off - init_off + 1] << 8;
689 pci_user_write_config_word(dev, off, val);
695 u32 val = data[off - init_off];
696 val |= (u32) data[off - init_off + 1] << 8;
697 val |= (u32) data[off - init_off + 2] << 16;
698 val |= (u32) data[off - init_off + 3] << 24;
699 pci_user_write_config_dword(dev, off, val);
705 u16 val = data[off - init_off];
706 val |= (u16) data[off - init_off + 1] << 8;
707 pci_user_write_config_word(dev, off, val);
713 pci_user_write_config_byte(dev, off, data[off - init_off]);
718 pci_config_pm_runtime_put(dev);
724 read_vpd_attr(struct file *filp, struct kobject *kobj,
725 struct bin_attribute *bin_attr,
726 char *buf, loff_t off, size_t count)
728 struct pci_dev *dev =
729 to_pci_dev(container_of(kobj, struct device, kobj));
731 if (off > bin_attr->size)
733 else if (count > bin_attr->size - off)
734 count = bin_attr->size - off;
736 return pci_read_vpd(dev, off, count, buf);
740 write_vpd_attr(struct file *filp, struct kobject *kobj,
741 struct bin_attribute *bin_attr,
742 char *buf, loff_t off, size_t count)
744 struct pci_dev *dev =
745 to_pci_dev(container_of(kobj, struct device, kobj));
747 if (off > bin_attr->size)
749 else if (count > bin_attr->size - off)
750 count = bin_attr->size - off;
752 return pci_write_vpd(dev, off, count, buf);
755 #ifdef HAVE_PCI_LEGACY
757 * pci_read_legacy_io - read byte(s) from legacy I/O port space
758 * @filp: open sysfs file
759 * @kobj: kobject corresponding to file to read from
760 * @bin_attr: struct bin_attribute for this file
761 * @buf: buffer to store results
762 * @off: offset into legacy I/O port space
763 * @count: number of bytes to read
765 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
766 * callback routine (pci_legacy_read).
769 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
770 struct bin_attribute *bin_attr,
771 char *buf, loff_t off, size_t count)
773 struct pci_bus *bus = to_pci_bus(container_of(kobj,
777 /* Only support 1, 2 or 4 byte accesses */
778 if (count != 1 && count != 2 && count != 4)
781 return pci_legacy_read(bus, off, (u32 *)buf, count);
785 * pci_write_legacy_io - write byte(s) to legacy I/O port space
786 * @filp: open sysfs file
787 * @kobj: kobject corresponding to file to read from
788 * @bin_attr: struct bin_attribute for this file
789 * @buf: buffer containing value to be written
790 * @off: offset into legacy I/O port space
791 * @count: number of bytes to write
793 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
794 * callback routine (pci_legacy_write).
797 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
798 struct bin_attribute *bin_attr,
799 char *buf, loff_t off, size_t count)
801 struct pci_bus *bus = to_pci_bus(container_of(kobj,
804 /* Only support 1, 2 or 4 byte accesses */
805 if (count != 1 && count != 2 && count != 4)
808 return pci_legacy_write(bus, off, *(u32 *)buf, count);
812 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
813 * @filp: open sysfs file
814 * @kobj: kobject corresponding to device to be mapped
815 * @attr: struct bin_attribute for this file
816 * @vma: struct vm_area_struct passed to mmap
818 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
819 * legacy memory space (first meg of bus space) into application virtual
823 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
824 struct bin_attribute *attr,
825 struct vm_area_struct *vma)
827 struct pci_bus *bus = to_pci_bus(container_of(kobj,
831 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
835 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
836 * @filp: open sysfs file
837 * @kobj: kobject corresponding to device to be mapped
838 * @attr: struct bin_attribute for this file
839 * @vma: struct vm_area_struct passed to mmap
841 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
842 * legacy IO space (first meg of bus space) into application virtual
843 * memory space. Returns -ENOSYS if the operation isn't supported
846 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
847 struct bin_attribute *attr,
848 struct vm_area_struct *vma)
850 struct pci_bus *bus = to_pci_bus(container_of(kobj,
854 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
858 * pci_adjust_legacy_attr - adjustment of legacy file attributes
859 * @b: bus to create files under
860 * @mmap_type: I/O port or memory
862 * Stub implementation. Can be overridden by arch if necessary.
865 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
871 * pci_create_legacy_files - create legacy I/O port and memory files
872 * @b: bus to create files under
874 * Some platforms allow access to legacy I/O port and ISA memory space on
875 * a per-bus basis. This routine creates the files and ties them into
876 * their associated read, write and mmap files from pci-sysfs.c
878 * On error unwind, but don't propagate the error to the caller
879 * as it is ok to set up the PCI bus without these files.
881 void pci_create_legacy_files(struct pci_bus *b)
885 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
890 sysfs_bin_attr_init(b->legacy_io);
891 b->legacy_io->attr.name = "legacy_io";
892 b->legacy_io->size = 0xffff;
893 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
894 b->legacy_io->read = pci_read_legacy_io;
895 b->legacy_io->write = pci_write_legacy_io;
896 b->legacy_io->mmap = pci_mmap_legacy_io;
897 pci_adjust_legacy_attr(b, pci_mmap_io);
898 error = device_create_bin_file(&b->dev, b->legacy_io);
902 /* Allocated above after the legacy_io struct */
903 b->legacy_mem = b->legacy_io + 1;
904 sysfs_bin_attr_init(b->legacy_mem);
905 b->legacy_mem->attr.name = "legacy_mem";
906 b->legacy_mem->size = 1024*1024;
907 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
908 b->legacy_mem->mmap = pci_mmap_legacy_mem;
909 pci_adjust_legacy_attr(b, pci_mmap_mem);
910 error = device_create_bin_file(&b->dev, b->legacy_mem);
917 device_remove_bin_file(&b->dev, b->legacy_io);
922 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
923 "and ISA memory resources to sysfs\n");
927 void pci_remove_legacy_files(struct pci_bus *b)
930 device_remove_bin_file(&b->dev, b->legacy_io);
931 device_remove_bin_file(&b->dev, b->legacy_mem);
932 kfree(b->legacy_io); /* both are allocated here */
935 #endif /* HAVE_PCI_LEGACY */
939 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
940 enum pci_mmap_api mmap_api)
942 unsigned long nr, start, size, pci_start;
944 if (pci_resource_len(pdev, resno) == 0)
947 start = vma->vm_pgoff;
948 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
949 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
950 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
951 if (start >= pci_start && start < pci_start + size &&
952 start + nr <= pci_start + size)
958 * pci_mmap_resource - map a PCI resource into user memory space
959 * @kobj: kobject for mapping
960 * @attr: struct bin_attribute for the file being mapped
961 * @vma: struct vm_area_struct passed into the mmap
962 * @write_combine: 1 for write_combine mapping
964 * Use the regular PCI mapping routines to map a PCI resource into userspace.
967 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
968 struct vm_area_struct *vma, int write_combine)
970 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
971 struct device, kobj));
972 struct resource *res = attr->private;
973 enum pci_mmap_state mmap_type;
974 resource_size_t start, end;
977 for (i = 0; i < PCI_ROM_RESOURCE; i++)
978 if (res == &pdev->resource[i])
980 if (i >= PCI_ROM_RESOURCE)
983 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
984 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
985 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
986 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
988 (u64)pci_resource_start(pdev, i),
989 (u64)pci_resource_len(pdev, i));
993 /* pci_mmap_page_range() expects the same kind of entry as coming
994 * from /proc/bus/pci/ which is a "user visible" value. If this is
995 * different from the resource itself, arch will do necessary fixup.
997 pci_resource_to_user(pdev, i, res, &start, &end);
998 vma->vm_pgoff += start >> PAGE_SHIFT;
999 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1001 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
1004 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1008 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1009 struct bin_attribute *attr,
1010 struct vm_area_struct *vma)
1012 return pci_mmap_resource(kobj, attr, vma, 0);
1016 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1017 struct bin_attribute *attr,
1018 struct vm_area_struct *vma)
1020 return pci_mmap_resource(kobj, attr, vma, 1);
1024 pci_resource_io(struct file *filp, struct kobject *kobj,
1025 struct bin_attribute *attr, char *buf,
1026 loff_t off, size_t count, bool write)
1028 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1029 struct device, kobj));
1030 struct resource *res = attr->private;
1031 unsigned long port = off;
1034 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1035 if (res == &pdev->resource[i])
1037 if (i >= PCI_ROM_RESOURCE)
1040 port += pci_resource_start(pdev, i);
1042 if (port > pci_resource_end(pdev, i))
1045 if (port + count - 1 > pci_resource_end(pdev, i))
1051 outb(*(u8 *)buf, port);
1053 *(u8 *)buf = inb(port);
1057 outw(*(u16 *)buf, port);
1059 *(u16 *)buf = inw(port);
1063 outl(*(u32 *)buf, port);
1065 *(u32 *)buf = inl(port);
1072 pci_read_resource_io(struct file *filp, struct kobject *kobj,
1073 struct bin_attribute *attr, char *buf,
1074 loff_t off, size_t count)
1076 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1080 pci_write_resource_io(struct file *filp, struct kobject *kobj,
1081 struct bin_attribute *attr, char *buf,
1082 loff_t off, size_t count)
1084 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1088 * pci_remove_resource_files - cleanup resource files
1089 * @pdev: dev to cleanup
1091 * If we created resource files for @pdev, remove them from sysfs and
1092 * free their resources.
1095 pci_remove_resource_files(struct pci_dev *pdev)
1099 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1100 struct bin_attribute *res_attr;
1102 res_attr = pdev->res_attr[i];
1104 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1108 res_attr = pdev->res_attr_wc[i];
1110 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1116 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1118 /* allocate attribute structure, piggyback attribute name */
1119 int name_len = write_combine ? 13 : 10;
1120 struct bin_attribute *res_attr;
1123 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1125 char *res_attr_name = (char *)(res_attr + 1);
1127 sysfs_bin_attr_init(res_attr);
1128 if (write_combine) {
1129 pdev->res_attr_wc[num] = res_attr;
1130 sprintf(res_attr_name, "resource%d_wc", num);
1131 res_attr->mmap = pci_mmap_resource_wc;
1133 pdev->res_attr[num] = res_attr;
1134 sprintf(res_attr_name, "resource%d", num);
1135 res_attr->mmap = pci_mmap_resource_uc;
1137 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1138 res_attr->read = pci_read_resource_io;
1139 res_attr->write = pci_write_resource_io;
1141 res_attr->attr.name = res_attr_name;
1142 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1143 res_attr->size = pci_resource_len(pdev, num);
1144 res_attr->private = &pdev->resource[num];
1145 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1153 * pci_create_resource_files - create resource files in sysfs for @dev
1154 * @pdev: dev in question
1156 * Walk the resources in @pdev creating files for each resource available.
1158 static int pci_create_resource_files(struct pci_dev *pdev)
1163 /* Expose the PCI resources from this device as files */
1164 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1166 /* skip empty resources */
1167 if (!pci_resource_len(pdev, i))
1170 retval = pci_create_attr(pdev, i, 0);
1171 /* for prefetchable resources, create a WC mappable file */
1172 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1173 retval = pci_create_attr(pdev, i, 1);
1176 pci_remove_resource_files(pdev);
1182 #else /* !HAVE_PCI_MMAP */
1183 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1184 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1185 #endif /* HAVE_PCI_MMAP */
1188 * pci_write_rom - used to enable access to the PCI ROM display
1190 * @kobj: kernel object handle
1191 * @bin_attr: struct bin_attribute for this file
1194 * @count: number of byte in input
1196 * writing anything except 0 enables it
1199 pci_write_rom(struct file *filp, struct kobject *kobj,
1200 struct bin_attribute *bin_attr,
1201 char *buf, loff_t off, size_t count)
1203 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1205 if ((off == 0) && (*buf == '0') && (count == 2))
1206 pdev->rom_attr_enabled = 0;
1208 pdev->rom_attr_enabled = 1;
1214 * pci_read_rom - read a PCI ROM
1216 * @kobj: kernel object handle
1217 * @bin_attr: struct bin_attribute for this file
1218 * @buf: where to put the data we read from the ROM
1220 * @count: number of bytes to read
1222 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1223 * device corresponding to @kobj.
1226 pci_read_rom(struct file *filp, struct kobject *kobj,
1227 struct bin_attribute *bin_attr,
1228 char *buf, loff_t off, size_t count)
1230 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1234 if (!pdev->rom_attr_enabled)
1237 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1244 if (off + count > size)
1247 memcpy_fromio(buf, rom + off, count);
1249 pci_unmap_rom(pdev, rom);
1254 static struct bin_attribute pci_config_attr = {
1257 .mode = S_IRUGO | S_IWUSR,
1259 .size = PCI_CFG_SPACE_SIZE,
1260 .read = pci_read_config,
1261 .write = pci_write_config,
1264 static struct bin_attribute pcie_config_attr = {
1267 .mode = S_IRUGO | S_IWUSR,
1269 .size = PCI_CFG_SPACE_EXP_SIZE,
1270 .read = pci_read_config,
1271 .write = pci_write_config,
1274 int __weak pcibios_add_platform_entries(struct pci_dev *dev)
1279 static ssize_t reset_store(struct device *dev,
1280 struct device_attribute *attr, const char *buf,
1283 struct pci_dev *pdev = to_pci_dev(dev);
1285 ssize_t result = kstrtoul(buf, 0, &val);
1293 result = pci_reset_function(pdev);
1300 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1302 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1305 struct bin_attribute *attr;
1307 /* If the device has VPD, try to expose it in sysfs. */
1309 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1313 sysfs_bin_attr_init(attr);
1314 attr->size = dev->vpd->len;
1315 attr->attr.name = "vpd";
1316 attr->attr.mode = S_IRUSR | S_IWUSR;
1317 attr->read = read_vpd_attr;
1318 attr->write = write_vpd_attr;
1319 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1324 dev->vpd->attr = attr;
1327 /* Active State Power Management */
1328 pcie_aspm_create_sysfs_dev_files(dev);
1330 if (!pci_probe_reset_function(dev)) {
1331 retval = device_create_file(&dev->dev, &reset_attr);
1339 pcie_aspm_remove_sysfs_dev_files(dev);
1340 if (dev->vpd && dev->vpd->attr) {
1341 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1342 kfree(dev->vpd->attr);
1348 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1352 struct bin_attribute *attr;
1354 if (!sysfs_initialized)
1357 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1358 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1360 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1364 retval = pci_create_resource_files(pdev);
1366 goto err_config_file;
1368 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1369 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1370 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1373 /* If the device has a ROM, try to expose it in sysfs. */
1375 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1378 goto err_resource_files;
1380 sysfs_bin_attr_init(attr);
1381 attr->size = rom_size;
1382 attr->attr.name = "rom";
1383 attr->attr.mode = S_IRUSR | S_IWUSR;
1384 attr->read = pci_read_rom;
1385 attr->write = pci_write_rom;
1386 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1389 goto err_resource_files;
1391 pdev->rom_attr = attr;
1394 /* add platform-specific attributes */
1395 retval = pcibios_add_platform_entries(pdev);
1399 /* add sysfs entries for various capabilities */
1400 retval = pci_create_capabilities_sysfs(pdev);
1404 pci_create_firmware_label_files(pdev);
1410 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1411 kfree(pdev->rom_attr);
1412 pdev->rom_attr = NULL;
1415 pci_remove_resource_files(pdev);
1417 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1418 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1420 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1425 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1427 if (dev->vpd && dev->vpd->attr) {
1428 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1429 kfree(dev->vpd->attr);
1432 pcie_aspm_remove_sysfs_dev_files(dev);
1433 if (dev->reset_fn) {
1434 device_remove_file(&dev->dev, &reset_attr);
1440 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1441 * @pdev: device whose entries we should free
1443 * Cleanup when @pdev is removed from sysfs.
1445 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1449 if (!sysfs_initialized)
1452 pci_remove_capabilities_sysfs(pdev);
1454 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1455 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1457 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1459 pci_remove_resource_files(pdev);
1461 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1462 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1463 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1466 if (rom_size && pdev->rom_attr) {
1467 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1468 kfree(pdev->rom_attr);
1471 pci_remove_firmware_label_files(pdev);
1475 static int __init pci_sysfs_init(void)
1477 struct pci_dev *pdev = NULL;
1480 sysfs_initialized = 1;
1481 for_each_pci_dev(pdev) {
1482 retval = pci_create_sysfs_dev_files(pdev);
1492 late_initcall(pci_sysfs_init);
1494 static struct attribute *pci_dev_dev_attrs[] = {
1499 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1500 struct attribute *a, int n)
1502 struct device *dev = container_of(kobj, struct device, kobj);
1503 struct pci_dev *pdev = to_pci_dev(dev);
1505 if (a == &vga_attr.attr)
1506 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1512 static struct attribute *pci_dev_hp_attrs[] = {
1513 &dev_remove_attr.attr,
1514 &dev_rescan_attr.attr,
1518 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1519 struct attribute *a, int n)
1521 struct device *dev = container_of(kobj, struct device, kobj);
1522 struct pci_dev *pdev = to_pci_dev(dev);
1524 if (pdev->is_virtfn)
1530 static struct attribute_group pci_dev_hp_attr_group = {
1531 .attrs = pci_dev_hp_attrs,
1532 .is_visible = pci_dev_hp_attrs_are_visible,
1535 #ifdef CONFIG_PCI_IOV
1536 static struct attribute *sriov_dev_attrs[] = {
1537 &sriov_totalvfs_attr.attr,
1538 &sriov_numvfs_attr.attr,
1542 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1543 struct attribute *a, int n)
1545 struct device *dev = container_of(kobj, struct device, kobj);
1547 if (!dev_is_pf(dev))
1553 static struct attribute_group sriov_dev_attr_group = {
1554 .attrs = sriov_dev_attrs,
1555 .is_visible = sriov_attrs_are_visible,
1557 #endif /* CONFIG_PCI_IOV */
1559 static struct attribute_group pci_dev_attr_group = {
1560 .attrs = pci_dev_dev_attrs,
1561 .is_visible = pci_dev_attrs_are_visible,
1564 static const struct attribute_group *pci_dev_attr_groups[] = {
1565 &pci_dev_attr_group,
1566 &pci_dev_hp_attr_group,
1567 #ifdef CONFIG_PCI_IOV
1568 &sriov_dev_attr_group,
1573 struct device_type pci_dev_type = {
1574 .groups = pci_dev_attr_groups,