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)
273 /* bad things may happen if the no_msi flag is changed
274 * while some drivers are loaded */
275 if (!capable(CAP_SYS_ADMIN))
278 /* Maybe pci devices without subordinate busses shouldn't even have this
279 * attribute in the first place? */
280 if (!pdev->subordinate)
283 /* Is the flag going to change, or keep the value it already had? */
284 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
286 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
288 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
289 " bad things could happen\n", val ? "" : " not");
294 static DEVICE_ATTR_RW(msi_bus);
296 static DEFINE_MUTEX(pci_remove_rescan_mutex);
297 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
301 struct pci_bus *b = NULL;
303 if (kstrtoul(buf, 0, &val) < 0)
307 mutex_lock(&pci_remove_rescan_mutex);
308 while ((b = pci_find_next_bus(b)) != NULL)
310 mutex_unlock(&pci_remove_rescan_mutex);
314 static BUS_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store);
316 static struct attribute *pci_bus_attrs[] = {
317 &bus_attr_rescan.attr,
321 static const struct attribute_group pci_bus_group = {
322 .attrs = pci_bus_attrs,
325 const struct attribute_group *pci_bus_groups[] = {
331 dev_rescan_store(struct device *dev, struct device_attribute *attr,
332 const char *buf, size_t count)
335 struct pci_dev *pdev = to_pci_dev(dev);
337 if (kstrtoul(buf, 0, &val) < 0)
341 mutex_lock(&pci_remove_rescan_mutex);
342 pci_rescan_bus(pdev->bus);
343 mutex_unlock(&pci_remove_rescan_mutex);
347 static struct device_attribute dev_rescan_attr = __ATTR(rescan,
349 NULL, dev_rescan_store);
351 static void remove_callback(struct device *dev)
353 struct pci_dev *pdev = to_pci_dev(dev);
355 mutex_lock(&pci_remove_rescan_mutex);
356 pci_stop_and_remove_bus_device(pdev);
357 mutex_unlock(&pci_remove_rescan_mutex);
361 remove_store(struct device *dev, struct device_attribute *dummy,
362 const char *buf, size_t count)
367 if (kstrtoul(buf, 0, &val) < 0)
370 /* An attribute cannot be unregistered by one of its own methods,
371 * so we have to use this roundabout approach.
374 ret = device_schedule_callback(dev, remove_callback);
379 static struct device_attribute dev_remove_attr = __ATTR(remove,
384 dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
385 const char *buf, size_t count)
388 struct pci_bus *bus = to_pci_bus(dev);
390 if (kstrtoul(buf, 0, &val) < 0)
394 mutex_lock(&pci_remove_rescan_mutex);
395 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
396 pci_rescan_bus_bridge_resize(bus->self);
399 mutex_unlock(&pci_remove_rescan_mutex);
403 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
405 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
406 static ssize_t d3cold_allowed_store(struct device *dev,
407 struct device_attribute *attr,
408 const char *buf, size_t count)
410 struct pci_dev *pdev = to_pci_dev(dev);
413 if (kstrtoul(buf, 0, &val) < 0)
416 pdev->d3cold_allowed = !!val;
417 pm_runtime_resume(dev);
422 static ssize_t d3cold_allowed_show(struct device *dev,
423 struct device_attribute *attr, char *buf)
425 struct pci_dev *pdev = to_pci_dev(dev);
426 return sprintf (buf, "%u\n", pdev->d3cold_allowed);
428 static DEVICE_ATTR_RW(d3cold_allowed);
431 #ifdef CONFIG_PCI_IOV
432 static ssize_t sriov_totalvfs_show(struct device *dev,
433 struct device_attribute *attr,
436 struct pci_dev *pdev = to_pci_dev(dev);
438 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
442 static ssize_t sriov_numvfs_show(struct device *dev,
443 struct device_attribute *attr,
446 struct pci_dev *pdev = to_pci_dev(dev);
448 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
452 * num_vfs > 0; number of VFs to enable
453 * num_vfs = 0; disable all VFs
455 * Note: SRIOV spec doesn't allow partial VF
456 * disable, so it's all or none.
458 static ssize_t sriov_numvfs_store(struct device *dev,
459 struct device_attribute *attr,
460 const char *buf, size_t count)
462 struct pci_dev *pdev = to_pci_dev(dev);
466 ret = kstrtou16(buf, 0, &num_vfs);
470 if (num_vfs > pci_sriov_get_totalvfs(pdev))
473 if (num_vfs == pdev->sriov->num_VFs)
474 return count; /* no change */
476 /* is PF driver loaded w/callback */
477 if (!pdev->driver || !pdev->driver->sriov_configure) {
478 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
484 ret = pdev->driver->sriov_configure(pdev, 0);
491 if (pdev->sriov->num_VFs) {
492 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
493 pdev->sriov->num_VFs, num_vfs);
497 ret = pdev->driver->sriov_configure(pdev, num_vfs);
502 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
508 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
509 static struct device_attribute sriov_numvfs_attr =
510 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
511 sriov_numvfs_show, sriov_numvfs_store);
512 #endif /* CONFIG_PCI_IOV */
514 static struct attribute *pci_dev_attrs[] = {
515 &dev_attr_resource.attr,
516 &dev_attr_vendor.attr,
517 &dev_attr_device.attr,
518 &dev_attr_subsystem_vendor.attr,
519 &dev_attr_subsystem_device.attr,
520 &dev_attr_class.attr,
522 &dev_attr_local_cpus.attr,
523 &dev_attr_local_cpulist.attr,
524 &dev_attr_modalias.attr,
526 &dev_attr_numa_node.attr,
528 &dev_attr_dma_mask_bits.attr,
529 &dev_attr_consistent_dma_mask_bits.attr,
530 &dev_attr_enabled.attr,
531 &dev_attr_broken_parity_status.attr,
532 &dev_attr_msi_bus.attr,
533 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
534 &dev_attr_d3cold_allowed.attr,
539 static const struct attribute_group pci_dev_group = {
540 .attrs = pci_dev_attrs,
543 const struct attribute_group *pci_dev_groups[] = {
548 static struct attribute *pcibus_attrs[] = {
549 &dev_attr_rescan.attr,
550 &dev_attr_cpuaffinity.attr,
551 &dev_attr_cpulistaffinity.attr,
555 static const struct attribute_group pcibus_group = {
556 .attrs = pcibus_attrs,
559 const struct attribute_group *pcibus_groups[] = {
565 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
567 struct pci_dev *pdev = to_pci_dev(dev);
568 struct pci_dev *vga_dev = vga_default_device();
571 return sprintf(buf, "%u\n", (pdev == vga_dev));
573 return sprintf(buf, "%u\n",
574 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
575 IORESOURCE_ROM_SHADOW));
577 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
580 pci_read_config(struct file *filp, struct kobject *kobj,
581 struct bin_attribute *bin_attr,
582 char *buf, loff_t off, size_t count)
584 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
585 unsigned int size = 64;
586 loff_t init_off = off;
587 u8 *data = (u8*) buf;
589 /* Several chips lock up trying to read undefined config space */
590 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
591 size = dev->cfg_size;
592 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
598 if (off + count > size) {
605 pci_config_pm_runtime_get(dev);
607 if ((off & 1) && size) {
609 pci_user_read_config_byte(dev, off, &val);
610 data[off - init_off] = val;
615 if ((off & 3) && size > 2) {
617 pci_user_read_config_word(dev, off, &val);
618 data[off - init_off] = val & 0xff;
619 data[off - init_off + 1] = (val >> 8) & 0xff;
626 pci_user_read_config_dword(dev, off, &val);
627 data[off - init_off] = val & 0xff;
628 data[off - init_off + 1] = (val >> 8) & 0xff;
629 data[off - init_off + 2] = (val >> 16) & 0xff;
630 data[off - init_off + 3] = (val >> 24) & 0xff;
637 pci_user_read_config_word(dev, off, &val);
638 data[off - init_off] = val & 0xff;
639 data[off - init_off + 1] = (val >> 8) & 0xff;
646 pci_user_read_config_byte(dev, off, &val);
647 data[off - init_off] = val;
652 pci_config_pm_runtime_put(dev);
658 pci_write_config(struct file* filp, struct kobject *kobj,
659 struct bin_attribute *bin_attr,
660 char *buf, loff_t off, size_t count)
662 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
663 unsigned int size = count;
664 loff_t init_off = off;
665 u8 *data = (u8*) buf;
667 if (off > dev->cfg_size)
669 if (off + count > dev->cfg_size) {
670 size = dev->cfg_size - off;
674 pci_config_pm_runtime_get(dev);
676 if ((off & 1) && size) {
677 pci_user_write_config_byte(dev, off, data[off - init_off]);
682 if ((off & 3) && size > 2) {
683 u16 val = data[off - init_off];
684 val |= (u16) data[off - init_off + 1] << 8;
685 pci_user_write_config_word(dev, off, val);
691 u32 val = data[off - init_off];
692 val |= (u32) data[off - init_off + 1] << 8;
693 val |= (u32) data[off - init_off + 2] << 16;
694 val |= (u32) data[off - init_off + 3] << 24;
695 pci_user_write_config_dword(dev, off, val);
701 u16 val = data[off - init_off];
702 val |= (u16) data[off - init_off + 1] << 8;
703 pci_user_write_config_word(dev, off, val);
709 pci_user_write_config_byte(dev, off, data[off - init_off]);
714 pci_config_pm_runtime_put(dev);
720 read_vpd_attr(struct file *filp, struct kobject *kobj,
721 struct bin_attribute *bin_attr,
722 char *buf, loff_t off, size_t count)
724 struct pci_dev *dev =
725 to_pci_dev(container_of(kobj, struct device, kobj));
727 if (off > bin_attr->size)
729 else if (count > bin_attr->size - off)
730 count = bin_attr->size - off;
732 return pci_read_vpd(dev, off, count, buf);
736 write_vpd_attr(struct file *filp, struct kobject *kobj,
737 struct bin_attribute *bin_attr,
738 char *buf, loff_t off, size_t count)
740 struct pci_dev *dev =
741 to_pci_dev(container_of(kobj, struct device, kobj));
743 if (off > bin_attr->size)
745 else if (count > bin_attr->size - off)
746 count = bin_attr->size - off;
748 return pci_write_vpd(dev, off, count, buf);
751 #ifdef HAVE_PCI_LEGACY
753 * pci_read_legacy_io - read byte(s) from legacy I/O port space
754 * @filp: open sysfs file
755 * @kobj: kobject corresponding to file to read from
756 * @bin_attr: struct bin_attribute for this file
757 * @buf: buffer to store results
758 * @off: offset into legacy I/O port space
759 * @count: number of bytes to read
761 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
762 * callback routine (pci_legacy_read).
765 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
766 struct bin_attribute *bin_attr,
767 char *buf, loff_t off, size_t count)
769 struct pci_bus *bus = to_pci_bus(container_of(kobj,
773 /* Only support 1, 2 or 4 byte accesses */
774 if (count != 1 && count != 2 && count != 4)
777 return pci_legacy_read(bus, off, (u32 *)buf, count);
781 * pci_write_legacy_io - write byte(s) to legacy I/O port space
782 * @filp: open sysfs file
783 * @kobj: kobject corresponding to file to read from
784 * @bin_attr: struct bin_attribute for this file
785 * @buf: buffer containing value to be written
786 * @off: offset into legacy I/O port space
787 * @count: number of bytes to write
789 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
790 * callback routine (pci_legacy_write).
793 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
794 struct bin_attribute *bin_attr,
795 char *buf, loff_t off, size_t count)
797 struct pci_bus *bus = to_pci_bus(container_of(kobj,
800 /* Only support 1, 2 or 4 byte accesses */
801 if (count != 1 && count != 2 && count != 4)
804 return pci_legacy_write(bus, off, *(u32 *)buf, count);
808 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
809 * @filp: open sysfs file
810 * @kobj: kobject corresponding to device to be mapped
811 * @attr: struct bin_attribute for this file
812 * @vma: struct vm_area_struct passed to mmap
814 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
815 * legacy memory space (first meg of bus space) into application virtual
819 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
820 struct bin_attribute *attr,
821 struct vm_area_struct *vma)
823 struct pci_bus *bus = to_pci_bus(container_of(kobj,
827 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
831 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
832 * @filp: open sysfs file
833 * @kobj: kobject corresponding to device to be mapped
834 * @attr: struct bin_attribute for this file
835 * @vma: struct vm_area_struct passed to mmap
837 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
838 * legacy IO space (first meg of bus space) into application virtual
839 * memory space. Returns -ENOSYS if the operation isn't supported
842 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
843 struct bin_attribute *attr,
844 struct vm_area_struct *vma)
846 struct pci_bus *bus = to_pci_bus(container_of(kobj,
850 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
854 * pci_adjust_legacy_attr - adjustment of legacy file attributes
855 * @b: bus to create files under
856 * @mmap_type: I/O port or memory
858 * Stub implementation. Can be overridden by arch if necessary.
861 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
867 * pci_create_legacy_files - create legacy I/O port and memory files
868 * @b: bus to create files under
870 * Some platforms allow access to legacy I/O port and ISA memory space on
871 * a per-bus basis. This routine creates the files and ties them into
872 * their associated read, write and mmap files from pci-sysfs.c
874 * On error unwind, but don't propagate the error to the caller
875 * as it is ok to set up the PCI bus without these files.
877 void pci_create_legacy_files(struct pci_bus *b)
881 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
886 sysfs_bin_attr_init(b->legacy_io);
887 b->legacy_io->attr.name = "legacy_io";
888 b->legacy_io->size = 0xffff;
889 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
890 b->legacy_io->read = pci_read_legacy_io;
891 b->legacy_io->write = pci_write_legacy_io;
892 b->legacy_io->mmap = pci_mmap_legacy_io;
893 pci_adjust_legacy_attr(b, pci_mmap_io);
894 error = device_create_bin_file(&b->dev, b->legacy_io);
898 /* Allocated above after the legacy_io struct */
899 b->legacy_mem = b->legacy_io + 1;
900 sysfs_bin_attr_init(b->legacy_mem);
901 b->legacy_mem->attr.name = "legacy_mem";
902 b->legacy_mem->size = 1024*1024;
903 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
904 b->legacy_mem->mmap = pci_mmap_legacy_mem;
905 pci_adjust_legacy_attr(b, pci_mmap_mem);
906 error = device_create_bin_file(&b->dev, b->legacy_mem);
913 device_remove_bin_file(&b->dev, b->legacy_io);
918 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
919 "and ISA memory resources to sysfs\n");
923 void pci_remove_legacy_files(struct pci_bus *b)
926 device_remove_bin_file(&b->dev, b->legacy_io);
927 device_remove_bin_file(&b->dev, b->legacy_mem);
928 kfree(b->legacy_io); /* both are allocated here */
931 #endif /* HAVE_PCI_LEGACY */
935 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
936 enum pci_mmap_api mmap_api)
938 unsigned long nr, start, size, pci_start;
940 if (pci_resource_len(pdev, resno) == 0)
943 start = vma->vm_pgoff;
944 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
945 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
946 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
947 if (start >= pci_start && start < pci_start + size &&
948 start + nr <= pci_start + size)
954 * pci_mmap_resource - map a PCI resource into user memory space
955 * @kobj: kobject for mapping
956 * @attr: struct bin_attribute for the file being mapped
957 * @vma: struct vm_area_struct passed into the mmap
958 * @write_combine: 1 for write_combine mapping
960 * Use the regular PCI mapping routines to map a PCI resource into userspace.
963 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
964 struct vm_area_struct *vma, int write_combine)
966 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
967 struct device, kobj));
968 struct resource *res = attr->private;
969 enum pci_mmap_state mmap_type;
970 resource_size_t start, end;
973 for (i = 0; i < PCI_ROM_RESOURCE; i++)
974 if (res == &pdev->resource[i])
976 if (i >= PCI_ROM_RESOURCE)
979 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
980 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
981 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
982 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
984 (u64)pci_resource_start(pdev, i),
985 (u64)pci_resource_len(pdev, i));
989 /* pci_mmap_page_range() expects the same kind of entry as coming
990 * from /proc/bus/pci/ which is a "user visible" value. If this is
991 * different from the resource itself, arch will do necessary fixup.
993 pci_resource_to_user(pdev, i, res, &start, &end);
994 vma->vm_pgoff += start >> PAGE_SHIFT;
995 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
997 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
1000 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1004 pci_mmap_resource_uc(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, 0);
1012 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1013 struct bin_attribute *attr,
1014 struct vm_area_struct *vma)
1016 return pci_mmap_resource(kobj, attr, vma, 1);
1020 pci_resource_io(struct file *filp, struct kobject *kobj,
1021 struct bin_attribute *attr, char *buf,
1022 loff_t off, size_t count, bool write)
1024 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1025 struct device, kobj));
1026 struct resource *res = attr->private;
1027 unsigned long port = off;
1030 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1031 if (res == &pdev->resource[i])
1033 if (i >= PCI_ROM_RESOURCE)
1036 port += pci_resource_start(pdev, i);
1038 if (port > pci_resource_end(pdev, i))
1041 if (port + count - 1 > pci_resource_end(pdev, i))
1047 outb(*(u8 *)buf, port);
1049 *(u8 *)buf = inb(port);
1053 outw(*(u16 *)buf, port);
1055 *(u16 *)buf = inw(port);
1059 outl(*(u32 *)buf, port);
1061 *(u32 *)buf = inl(port);
1068 pci_read_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, false);
1076 pci_write_resource_io(struct file *filp, struct kobject *kobj,
1077 struct bin_attribute *attr, char *buf,
1078 loff_t off, size_t count)
1080 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1084 * pci_remove_resource_files - cleanup resource files
1085 * @pdev: dev to cleanup
1087 * If we created resource files for @pdev, remove them from sysfs and
1088 * free their resources.
1091 pci_remove_resource_files(struct pci_dev *pdev)
1095 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1096 struct bin_attribute *res_attr;
1098 res_attr = pdev->res_attr[i];
1100 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1104 res_attr = pdev->res_attr_wc[i];
1106 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1112 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1114 /* allocate attribute structure, piggyback attribute name */
1115 int name_len = write_combine ? 13 : 10;
1116 struct bin_attribute *res_attr;
1119 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1121 char *res_attr_name = (char *)(res_attr + 1);
1123 sysfs_bin_attr_init(res_attr);
1124 if (write_combine) {
1125 pdev->res_attr_wc[num] = res_attr;
1126 sprintf(res_attr_name, "resource%d_wc", num);
1127 res_attr->mmap = pci_mmap_resource_wc;
1129 pdev->res_attr[num] = res_attr;
1130 sprintf(res_attr_name, "resource%d", num);
1131 res_attr->mmap = pci_mmap_resource_uc;
1133 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1134 res_attr->read = pci_read_resource_io;
1135 res_attr->write = pci_write_resource_io;
1137 res_attr->attr.name = res_attr_name;
1138 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1139 res_attr->size = pci_resource_len(pdev, num);
1140 res_attr->private = &pdev->resource[num];
1141 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1149 * pci_create_resource_files - create resource files in sysfs for @dev
1150 * @pdev: dev in question
1152 * Walk the resources in @pdev creating files for each resource available.
1154 static int pci_create_resource_files(struct pci_dev *pdev)
1159 /* Expose the PCI resources from this device as files */
1160 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1162 /* skip empty resources */
1163 if (!pci_resource_len(pdev, i))
1166 retval = pci_create_attr(pdev, i, 0);
1167 /* for prefetchable resources, create a WC mappable file */
1168 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1169 retval = pci_create_attr(pdev, i, 1);
1172 pci_remove_resource_files(pdev);
1178 #else /* !HAVE_PCI_MMAP */
1179 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1180 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1181 #endif /* HAVE_PCI_MMAP */
1184 * pci_write_rom - used to enable access to the PCI ROM display
1186 * @kobj: kernel object handle
1187 * @bin_attr: struct bin_attribute for this file
1190 * @count: number of byte in input
1192 * writing anything except 0 enables it
1195 pci_write_rom(struct file *filp, struct kobject *kobj,
1196 struct bin_attribute *bin_attr,
1197 char *buf, loff_t off, size_t count)
1199 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1201 if ((off == 0) && (*buf == '0') && (count == 2))
1202 pdev->rom_attr_enabled = 0;
1204 pdev->rom_attr_enabled = 1;
1210 * pci_read_rom - read a PCI ROM
1212 * @kobj: kernel object handle
1213 * @bin_attr: struct bin_attribute for this file
1214 * @buf: where to put the data we read from the ROM
1216 * @count: number of bytes to read
1218 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1219 * device corresponding to @kobj.
1222 pci_read_rom(struct file *filp, struct kobject *kobj,
1223 struct bin_attribute *bin_attr,
1224 char *buf, loff_t off, size_t count)
1226 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1230 if (!pdev->rom_attr_enabled)
1233 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1240 if (off + count > size)
1243 memcpy_fromio(buf, rom + off, count);
1245 pci_unmap_rom(pdev, rom);
1250 static struct bin_attribute pci_config_attr = {
1253 .mode = S_IRUGO | S_IWUSR,
1255 .size = PCI_CFG_SPACE_SIZE,
1256 .read = pci_read_config,
1257 .write = pci_write_config,
1260 static struct bin_attribute pcie_config_attr = {
1263 .mode = S_IRUGO | S_IWUSR,
1265 .size = PCI_CFG_SPACE_EXP_SIZE,
1266 .read = pci_read_config,
1267 .write = pci_write_config,
1270 int __weak pcibios_add_platform_entries(struct pci_dev *dev)
1275 static ssize_t reset_store(struct device *dev,
1276 struct device_attribute *attr, const char *buf,
1279 struct pci_dev *pdev = to_pci_dev(dev);
1281 ssize_t result = kstrtoul(buf, 0, &val);
1289 result = pci_reset_function(pdev);
1296 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1298 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1301 struct bin_attribute *attr;
1303 /* If the device has VPD, try to expose it in sysfs. */
1305 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1309 sysfs_bin_attr_init(attr);
1310 attr->size = dev->vpd->len;
1311 attr->attr.name = "vpd";
1312 attr->attr.mode = S_IRUSR | S_IWUSR;
1313 attr->read = read_vpd_attr;
1314 attr->write = write_vpd_attr;
1315 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1320 dev->vpd->attr = attr;
1323 /* Active State Power Management */
1324 pcie_aspm_create_sysfs_dev_files(dev);
1326 if (!pci_probe_reset_function(dev)) {
1327 retval = device_create_file(&dev->dev, &reset_attr);
1335 pcie_aspm_remove_sysfs_dev_files(dev);
1336 if (dev->vpd && dev->vpd->attr) {
1337 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1338 kfree(dev->vpd->attr);
1344 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1348 struct bin_attribute *attr;
1350 if (!sysfs_initialized)
1353 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1354 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1356 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1360 retval = pci_create_resource_files(pdev);
1362 goto err_config_file;
1364 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1365 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1366 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1369 /* If the device has a ROM, try to expose it in sysfs. */
1371 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1374 goto err_resource_files;
1376 sysfs_bin_attr_init(attr);
1377 attr->size = rom_size;
1378 attr->attr.name = "rom";
1379 attr->attr.mode = S_IRUSR | S_IWUSR;
1380 attr->read = pci_read_rom;
1381 attr->write = pci_write_rom;
1382 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1385 goto err_resource_files;
1387 pdev->rom_attr = attr;
1390 /* add platform-specific attributes */
1391 retval = pcibios_add_platform_entries(pdev);
1395 /* add sysfs entries for various capabilities */
1396 retval = pci_create_capabilities_sysfs(pdev);
1400 pci_create_firmware_label_files(pdev);
1406 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1407 kfree(pdev->rom_attr);
1408 pdev->rom_attr = NULL;
1411 pci_remove_resource_files(pdev);
1413 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1414 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1416 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1421 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1423 if (dev->vpd && dev->vpd->attr) {
1424 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1425 kfree(dev->vpd->attr);
1428 pcie_aspm_remove_sysfs_dev_files(dev);
1429 if (dev->reset_fn) {
1430 device_remove_file(&dev->dev, &reset_attr);
1436 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1437 * @pdev: device whose entries we should free
1439 * Cleanup when @pdev is removed from sysfs.
1441 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1445 if (!sysfs_initialized)
1448 pci_remove_capabilities_sysfs(pdev);
1450 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1451 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1453 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1455 pci_remove_resource_files(pdev);
1457 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1458 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1459 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1462 if (rom_size && pdev->rom_attr) {
1463 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1464 kfree(pdev->rom_attr);
1467 pci_remove_firmware_label_files(pdev);
1471 static int __init pci_sysfs_init(void)
1473 struct pci_dev *pdev = NULL;
1476 sysfs_initialized = 1;
1477 for_each_pci_dev(pdev) {
1478 retval = pci_create_sysfs_dev_files(pdev);
1488 late_initcall(pci_sysfs_init);
1490 static struct attribute *pci_dev_dev_attrs[] = {
1495 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1496 struct attribute *a, int n)
1498 struct device *dev = container_of(kobj, struct device, kobj);
1499 struct pci_dev *pdev = to_pci_dev(dev);
1501 if (a == &vga_attr.attr)
1502 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1508 static struct attribute *pci_dev_hp_attrs[] = {
1509 &dev_remove_attr.attr,
1510 &dev_rescan_attr.attr,
1514 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1515 struct attribute *a, int n)
1517 struct device *dev = container_of(kobj, struct device, kobj);
1518 struct pci_dev *pdev = to_pci_dev(dev);
1520 if (pdev->is_virtfn)
1526 static struct attribute_group pci_dev_hp_attr_group = {
1527 .attrs = pci_dev_hp_attrs,
1528 .is_visible = pci_dev_hp_attrs_are_visible,
1531 #ifdef CONFIG_PCI_IOV
1532 static struct attribute *sriov_dev_attrs[] = {
1533 &sriov_totalvfs_attr.attr,
1534 &sriov_numvfs_attr.attr,
1538 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1539 struct attribute *a, int n)
1541 struct device *dev = container_of(kobj, struct device, kobj);
1543 if (!dev_is_pf(dev))
1549 static struct attribute_group sriov_dev_attr_group = {
1550 .attrs = sriov_dev_attrs,
1551 .is_visible = sriov_attrs_are_visible,
1553 #endif /* CONFIG_PCI_IOV */
1555 static struct attribute_group pci_dev_attr_group = {
1556 .attrs = pci_dev_dev_attrs,
1557 .is_visible = pci_dev_attrs_are_visible,
1560 static const struct attribute_group *pci_dev_attr_groups[] = {
1561 &pci_dev_attr_group,
1562 &pci_dev_hp_attr_group,
1563 #ifdef CONFIG_PCI_IOV
1564 &sriov_dev_attr_group,
1569 struct device_type pci_dev_type = {
1570 .groups = pci_dev_attr_groups,