2 * drivers/pci/pci-sysfs.c
4 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
5 * (C) Copyright 2002-2004 IBM Corp.
6 * (C) Copyright 2003 Matthew Wilcox
7 * (C) Copyright 2003 Hewlett-Packard
8 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
9 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
11 * File attributes for PCI devices
13 * Modeled after usb's driverfs.c
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/pci.h>
21 #include <linux/stat.h>
22 #include <linux/export.h>
23 #include <linux/topology.h>
26 #include <linux/capability.h>
27 #include <linux/security.h>
28 #include <linux/pci-aspm.h>
29 #include <linux/slab.h>
30 #include <linux/vgaarb.h>
31 #include <linux/pm_runtime.h>
35 static int sysfs_initialized; /* = 0 */
37 /* show configuration fields */
38 #define pci_config_attr(field, format_string) \
40 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
42 struct pci_dev *pdev; \
44 pdev = to_pci_dev (dev); \
45 return sprintf (buf, format_string, pdev->field); \
47 static DEVICE_ATTR_RO(field)
49 pci_config_attr(vendor, "0x%04x\n");
50 pci_config_attr(device, "0x%04x\n");
51 pci_config_attr(subsystem_vendor, "0x%04x\n");
52 pci_config_attr(subsystem_device, "0x%04x\n");
53 pci_config_attr(class, "0x%06x\n");
54 pci_config_attr(irq, "%u\n");
56 static ssize_t broken_parity_status_show(struct device *dev,
57 struct device_attribute *attr,
60 struct pci_dev *pdev = to_pci_dev(dev);
61 return sprintf (buf, "%u\n", pdev->broken_parity_status);
64 static ssize_t broken_parity_status_store(struct device *dev,
65 struct device_attribute *attr,
66 const char *buf, size_t count)
68 struct pci_dev *pdev = to_pci_dev(dev);
71 if (kstrtoul(buf, 0, &val) < 0)
74 pdev->broken_parity_status = !!val;
78 static DEVICE_ATTR_RW(broken_parity_status);
80 static ssize_t pci_dev_show_local_cpu(struct device *dev,
82 struct device_attribute *attr,
85 const struct cpumask *mask;
89 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
90 cpumask_of_node(dev_to_node(dev));
92 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
95 cpumask_scnprintf(buf, PAGE_SIZE-2, mask) :
96 cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
103 static ssize_t local_cpus_show(struct device *dev,
104 struct device_attribute *attr, char *buf)
106 return pci_dev_show_local_cpu(dev, 1, attr, buf);
108 static DEVICE_ATTR_RO(local_cpus);
110 static ssize_t local_cpulist_show(struct device *dev,
111 struct device_attribute *attr, char *buf)
113 return pci_dev_show_local_cpu(dev, 0, attr, buf);
115 static DEVICE_ATTR_RO(local_cpulist);
118 * PCI Bus Class Devices
120 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
122 struct device_attribute *attr,
126 const struct cpumask *cpumask;
128 cpumask = cpumask_of_pcibus(to_pci_bus(dev));
130 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
131 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
137 static ssize_t cpuaffinity_show(struct device *dev,
138 struct device_attribute *attr, char *buf)
140 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
142 static DEVICE_ATTR_RO(cpuaffinity);
144 static ssize_t cpulistaffinity_show(struct device *dev,
145 struct device_attribute *attr, char *buf)
147 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
149 static DEVICE_ATTR_RO(cpulistaffinity);
153 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
155 struct pci_dev * pci_dev = to_pci_dev(dev);
159 resource_size_t start, end;
161 if (pci_dev->subordinate)
162 max = DEVICE_COUNT_RESOURCE;
164 max = PCI_BRIDGE_RESOURCES;
166 for (i = 0; i < max; i++) {
167 struct resource *res = &pci_dev->resource[i];
168 pci_resource_to_user(pci_dev, i, res, &start, &end);
169 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
170 (unsigned long long)start,
171 (unsigned long long)end,
172 (unsigned long long)res->flags);
176 static DEVICE_ATTR_RO(resource);
178 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
180 struct pci_dev *pci_dev = to_pci_dev(dev);
182 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
183 pci_dev->vendor, pci_dev->device,
184 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
185 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
186 (u8)(pci_dev->class));
188 static DEVICE_ATTR_RO(modalias);
190 static ssize_t enabled_store(struct device *dev,
191 struct device_attribute *attr, const char *buf,
194 struct pci_dev *pdev = to_pci_dev(dev);
196 ssize_t result = kstrtoul(buf, 0, &val);
201 /* this can crash the machine when done on the "wrong" device */
202 if (!capable(CAP_SYS_ADMIN))
206 if (pci_is_enabled(pdev))
207 pci_disable_device(pdev);
211 result = pci_enable_device(pdev);
213 return result < 0 ? result : count;
216 static ssize_t enabled_show(struct device *dev,
217 struct device_attribute *attr, char *buf)
219 struct pci_dev *pdev;
221 pdev = to_pci_dev (dev);
222 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
224 static DEVICE_ATTR_RW(enabled);
228 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
230 return sprintf (buf, "%d\n", dev->numa_node);
232 static DEVICE_ATTR_RO(numa_node);
236 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
238 struct pci_dev *pdev = to_pci_dev(dev);
240 return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
242 static DEVICE_ATTR_RO(dma_mask_bits);
245 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
248 return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
250 static DEVICE_ATTR_RO(consistent_dma_mask_bits);
253 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
255 struct pci_dev *pdev = to_pci_dev(dev);
257 if (!pdev->subordinate)
260 return sprintf (buf, "%u\n",
261 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
265 msi_bus_store(struct device *dev, struct device_attribute *attr,
266 const char *buf, size_t count)
268 struct pci_dev *pdev = to_pci_dev(dev);
271 if (kstrtoul(buf, 0, &val) < 0)
275 * Bad things may happen if the no_msi flag is changed
276 * while drivers are loaded.
278 if (!capable(CAP_SYS_ADMIN))
282 * Maybe devices without subordinate buses shouldn't have this
283 * attribute in the first place?
285 if (!pdev->subordinate)
288 /* Is the flag going to change, or keep the value it already had? */
289 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
291 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
293 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
294 " bad things could happen\n", val ? "" : " not");
299 static DEVICE_ATTR_RW(msi_bus);
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 pci_lock_rescan_remove();
312 while ((b = pci_find_next_bus(b)) != NULL)
314 pci_unlock_rescan_remove();
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 pci_lock_rescan_remove();
346 pci_rescan_bus(pdev->bus);
347 pci_unlock_rescan_remove();
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 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev));
368 static struct device_attribute dev_remove_attr = __ATTR(remove,
373 dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
374 const char *buf, size_t count)
377 struct pci_bus *bus = to_pci_bus(dev);
379 if (kstrtoul(buf, 0, &val) < 0)
383 pci_lock_rescan_remove();
384 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
385 pci_rescan_bus_bridge_resize(bus->self);
388 pci_unlock_rescan_remove();
392 static DEVICE_ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store);
394 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
395 static ssize_t d3cold_allowed_store(struct device *dev,
396 struct device_attribute *attr,
397 const char *buf, size_t count)
399 struct pci_dev *pdev = to_pci_dev(dev);
402 if (kstrtoul(buf, 0, &val) < 0)
405 pdev->d3cold_allowed = !!val;
406 pm_runtime_resume(dev);
411 static ssize_t d3cold_allowed_show(struct device *dev,
412 struct device_attribute *attr, char *buf)
414 struct pci_dev *pdev = to_pci_dev(dev);
415 return sprintf (buf, "%u\n", pdev->d3cold_allowed);
417 static DEVICE_ATTR_RW(d3cold_allowed);
421 static ssize_t devspec_show(struct device *dev,
422 struct device_attribute *attr, char *buf)
424 struct pci_dev *pdev = to_pci_dev(dev);
425 struct device_node *np = pci_device_to_OF_node(pdev);
427 if (np == NULL || np->full_name == NULL)
429 return sprintf(buf, "%s", np->full_name);
431 static DEVICE_ATTR_RO(devspec);
434 #ifdef CONFIG_PCI_IOV
435 static ssize_t sriov_totalvfs_show(struct device *dev,
436 struct device_attribute *attr,
439 struct pci_dev *pdev = to_pci_dev(dev);
441 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
445 static ssize_t sriov_numvfs_show(struct device *dev,
446 struct device_attribute *attr,
449 struct pci_dev *pdev = to_pci_dev(dev);
451 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
455 * num_vfs > 0; number of VFs to enable
456 * num_vfs = 0; disable all VFs
458 * Note: SRIOV spec doesn't allow partial VF
459 * disable, so it's all or none.
461 static ssize_t sriov_numvfs_store(struct device *dev,
462 struct device_attribute *attr,
463 const char *buf, size_t count)
465 struct pci_dev *pdev = to_pci_dev(dev);
469 ret = kstrtou16(buf, 0, &num_vfs);
473 if (num_vfs > pci_sriov_get_totalvfs(pdev))
476 if (num_vfs == pdev->sriov->num_VFs)
477 return count; /* no change */
479 /* is PF driver loaded w/callback */
480 if (!pdev->driver || !pdev->driver->sriov_configure) {
481 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
487 ret = pdev->driver->sriov_configure(pdev, 0);
494 if (pdev->sriov->num_VFs) {
495 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
496 pdev->sriov->num_VFs, num_vfs);
500 ret = pdev->driver->sriov_configure(pdev, num_vfs);
505 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
511 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
512 static struct device_attribute sriov_numvfs_attr =
513 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
514 sriov_numvfs_show, sriov_numvfs_store);
515 #endif /* CONFIG_PCI_IOV */
517 static struct attribute *pci_dev_attrs[] = {
518 &dev_attr_resource.attr,
519 &dev_attr_vendor.attr,
520 &dev_attr_device.attr,
521 &dev_attr_subsystem_vendor.attr,
522 &dev_attr_subsystem_device.attr,
523 &dev_attr_class.attr,
525 &dev_attr_local_cpus.attr,
526 &dev_attr_local_cpulist.attr,
527 &dev_attr_modalias.attr,
529 &dev_attr_numa_node.attr,
531 &dev_attr_dma_mask_bits.attr,
532 &dev_attr_consistent_dma_mask_bits.attr,
533 &dev_attr_enabled.attr,
534 &dev_attr_broken_parity_status.attr,
535 &dev_attr_msi_bus.attr,
536 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
537 &dev_attr_d3cold_allowed.attr,
540 &dev_attr_devspec.attr,
545 static const struct attribute_group pci_dev_group = {
546 .attrs = pci_dev_attrs,
549 const struct attribute_group *pci_dev_groups[] = {
554 static struct attribute *pcibus_attrs[] = {
555 &dev_attr_rescan.attr,
556 &dev_attr_cpuaffinity.attr,
557 &dev_attr_cpulistaffinity.attr,
561 static const struct attribute_group pcibus_group = {
562 .attrs = pcibus_attrs,
565 const struct attribute_group *pcibus_groups[] = {
571 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
573 struct pci_dev *pdev = to_pci_dev(dev);
574 struct pci_dev *vga_dev = vga_default_device();
577 return sprintf(buf, "%u\n", (pdev == vga_dev));
579 return sprintf(buf, "%u\n",
580 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
581 IORESOURCE_ROM_SHADOW));
583 static struct device_attribute vga_attr = __ATTR_RO(boot_vga);
586 pci_read_config(struct file *filp, struct kobject *kobj,
587 struct bin_attribute *bin_attr,
588 char *buf, loff_t off, size_t count)
590 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
591 unsigned int size = 64;
592 loff_t init_off = off;
593 u8 *data = (u8*) buf;
595 /* Several chips lock up trying to read undefined config space */
596 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
597 size = dev->cfg_size;
598 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
604 if (off + count > size) {
611 pci_config_pm_runtime_get(dev);
613 if ((off & 1) && size) {
615 pci_user_read_config_byte(dev, off, &val);
616 data[off - init_off] = val;
621 if ((off & 3) && size > 2) {
623 pci_user_read_config_word(dev, off, &val);
624 data[off - init_off] = val & 0xff;
625 data[off - init_off + 1] = (val >> 8) & 0xff;
632 pci_user_read_config_dword(dev, off, &val);
633 data[off - init_off] = val & 0xff;
634 data[off - init_off + 1] = (val >> 8) & 0xff;
635 data[off - init_off + 2] = (val >> 16) & 0xff;
636 data[off - init_off + 3] = (val >> 24) & 0xff;
643 pci_user_read_config_word(dev, off, &val);
644 data[off - init_off] = val & 0xff;
645 data[off - init_off + 1] = (val >> 8) & 0xff;
652 pci_user_read_config_byte(dev, off, &val);
653 data[off - init_off] = val;
658 pci_config_pm_runtime_put(dev);
664 pci_write_config(struct file* filp, struct kobject *kobj,
665 struct bin_attribute *bin_attr,
666 char *buf, loff_t off, size_t count)
668 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
669 unsigned int size = count;
670 loff_t init_off = off;
671 u8 *data = (u8*) buf;
673 if (off > dev->cfg_size)
675 if (off + count > dev->cfg_size) {
676 size = dev->cfg_size - off;
680 pci_config_pm_runtime_get(dev);
682 if ((off & 1) && size) {
683 pci_user_write_config_byte(dev, off, data[off - init_off]);
688 if ((off & 3) && size > 2) {
689 u16 val = data[off - init_off];
690 val |= (u16) data[off - init_off + 1] << 8;
691 pci_user_write_config_word(dev, off, val);
697 u32 val = data[off - init_off];
698 val |= (u32) data[off - init_off + 1] << 8;
699 val |= (u32) data[off - init_off + 2] << 16;
700 val |= (u32) data[off - init_off + 3] << 24;
701 pci_user_write_config_dword(dev, off, val);
707 u16 val = data[off - init_off];
708 val |= (u16) data[off - init_off + 1] << 8;
709 pci_user_write_config_word(dev, off, val);
715 pci_user_write_config_byte(dev, off, data[off - init_off]);
720 pci_config_pm_runtime_put(dev);
726 read_vpd_attr(struct file *filp, struct kobject *kobj,
727 struct bin_attribute *bin_attr,
728 char *buf, loff_t off, size_t count)
730 struct pci_dev *dev =
731 to_pci_dev(container_of(kobj, struct device, kobj));
733 if (off > bin_attr->size)
735 else if (count > bin_attr->size - off)
736 count = bin_attr->size - off;
738 return pci_read_vpd(dev, off, count, buf);
742 write_vpd_attr(struct file *filp, struct kobject *kobj,
743 struct bin_attribute *bin_attr,
744 char *buf, loff_t off, size_t count)
746 struct pci_dev *dev =
747 to_pci_dev(container_of(kobj, struct device, kobj));
749 if (off > bin_attr->size)
751 else if (count > bin_attr->size - off)
752 count = bin_attr->size - off;
754 return pci_write_vpd(dev, off, count, buf);
757 #ifdef HAVE_PCI_LEGACY
759 * pci_read_legacy_io - read byte(s) from legacy I/O port space
760 * @filp: open sysfs file
761 * @kobj: kobject corresponding to file to read from
762 * @bin_attr: struct bin_attribute for this file
763 * @buf: buffer to store results
764 * @off: offset into legacy I/O port space
765 * @count: number of bytes to read
767 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
768 * callback routine (pci_legacy_read).
771 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
772 struct bin_attribute *bin_attr,
773 char *buf, loff_t off, size_t count)
775 struct pci_bus *bus = to_pci_bus(container_of(kobj,
779 /* Only support 1, 2 or 4 byte accesses */
780 if (count != 1 && count != 2 && count != 4)
783 return pci_legacy_read(bus, off, (u32 *)buf, count);
787 * pci_write_legacy_io - write byte(s) to legacy I/O port space
788 * @filp: open sysfs file
789 * @kobj: kobject corresponding to file to read from
790 * @bin_attr: struct bin_attribute for this file
791 * @buf: buffer containing value to be written
792 * @off: offset into legacy I/O port space
793 * @count: number of bytes to write
795 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
796 * callback routine (pci_legacy_write).
799 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
800 struct bin_attribute *bin_attr,
801 char *buf, loff_t off, size_t count)
803 struct pci_bus *bus = to_pci_bus(container_of(kobj,
806 /* Only support 1, 2 or 4 byte accesses */
807 if (count != 1 && count != 2 && count != 4)
810 return pci_legacy_write(bus, off, *(u32 *)buf, count);
814 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
815 * @filp: open sysfs file
816 * @kobj: kobject corresponding to device to be mapped
817 * @attr: struct bin_attribute for this file
818 * @vma: struct vm_area_struct passed to mmap
820 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
821 * legacy memory space (first meg of bus space) into application virtual
825 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
826 struct bin_attribute *attr,
827 struct vm_area_struct *vma)
829 struct pci_bus *bus = to_pci_bus(container_of(kobj,
833 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
837 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
838 * @filp: open sysfs file
839 * @kobj: kobject corresponding to device to be mapped
840 * @attr: struct bin_attribute for this file
841 * @vma: struct vm_area_struct passed to mmap
843 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
844 * legacy IO space (first meg of bus space) into application virtual
845 * memory space. Returns -ENOSYS if the operation isn't supported
848 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
849 struct bin_attribute *attr,
850 struct vm_area_struct *vma)
852 struct pci_bus *bus = to_pci_bus(container_of(kobj,
856 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
860 * pci_adjust_legacy_attr - adjustment of legacy file attributes
861 * @b: bus to create files under
862 * @mmap_type: I/O port or memory
864 * Stub implementation. Can be overridden by arch if necessary.
867 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
873 * pci_create_legacy_files - create legacy I/O port and memory files
874 * @b: bus to create files under
876 * Some platforms allow access to legacy I/O port and ISA memory space on
877 * a per-bus basis. This routine creates the files and ties them into
878 * their associated read, write and mmap files from pci-sysfs.c
880 * On error unwind, but don't propagate the error to the caller
881 * as it is ok to set up the PCI bus without these files.
883 void pci_create_legacy_files(struct pci_bus *b)
887 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
892 sysfs_bin_attr_init(b->legacy_io);
893 b->legacy_io->attr.name = "legacy_io";
894 b->legacy_io->size = 0xffff;
895 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
896 b->legacy_io->read = pci_read_legacy_io;
897 b->legacy_io->write = pci_write_legacy_io;
898 b->legacy_io->mmap = pci_mmap_legacy_io;
899 pci_adjust_legacy_attr(b, pci_mmap_io);
900 error = device_create_bin_file(&b->dev, b->legacy_io);
904 /* Allocated above after the legacy_io struct */
905 b->legacy_mem = b->legacy_io + 1;
906 sysfs_bin_attr_init(b->legacy_mem);
907 b->legacy_mem->attr.name = "legacy_mem";
908 b->legacy_mem->size = 1024*1024;
909 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
910 b->legacy_mem->mmap = pci_mmap_legacy_mem;
911 pci_adjust_legacy_attr(b, pci_mmap_mem);
912 error = device_create_bin_file(&b->dev, b->legacy_mem);
919 device_remove_bin_file(&b->dev, b->legacy_io);
924 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
925 "and ISA memory resources to sysfs\n");
929 void pci_remove_legacy_files(struct pci_bus *b)
932 device_remove_bin_file(&b->dev, b->legacy_io);
933 device_remove_bin_file(&b->dev, b->legacy_mem);
934 kfree(b->legacy_io); /* both are allocated here */
937 #endif /* HAVE_PCI_LEGACY */
941 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
942 enum pci_mmap_api mmap_api)
944 unsigned long nr, start, size, pci_start;
946 if (pci_resource_len(pdev, resno) == 0)
949 start = vma->vm_pgoff;
950 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
951 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
952 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
953 if (start >= pci_start && start < pci_start + size &&
954 start + nr <= pci_start + size)
960 * pci_mmap_resource - map a PCI resource into user memory space
961 * @kobj: kobject for mapping
962 * @attr: struct bin_attribute for the file being mapped
963 * @vma: struct vm_area_struct passed into the mmap
964 * @write_combine: 1 for write_combine mapping
966 * Use the regular PCI mapping routines to map a PCI resource into userspace.
969 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
970 struct vm_area_struct *vma, int write_combine)
972 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
973 struct device, kobj));
974 struct resource *res = attr->private;
975 enum pci_mmap_state mmap_type;
976 resource_size_t start, end;
979 for (i = 0; i < PCI_ROM_RESOURCE; i++)
980 if (res == &pdev->resource[i])
982 if (i >= PCI_ROM_RESOURCE)
985 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
986 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
987 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
988 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
990 (u64)pci_resource_start(pdev, i),
991 (u64)pci_resource_len(pdev, i));
995 /* pci_mmap_page_range() expects the same kind of entry as coming
996 * from /proc/bus/pci/ which is a "user visible" value. If this is
997 * different from the resource itself, arch will do necessary fixup.
999 pci_resource_to_user(pdev, i, res, &start, &end);
1000 vma->vm_pgoff += start >> PAGE_SHIFT;
1001 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
1003 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
1006 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
1010 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
1011 struct bin_attribute *attr,
1012 struct vm_area_struct *vma)
1014 return pci_mmap_resource(kobj, attr, vma, 0);
1018 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
1019 struct bin_attribute *attr,
1020 struct vm_area_struct *vma)
1022 return pci_mmap_resource(kobj, attr, vma, 1);
1026 pci_resource_io(struct file *filp, struct kobject *kobj,
1027 struct bin_attribute *attr, char *buf,
1028 loff_t off, size_t count, bool write)
1030 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
1031 struct device, kobj));
1032 struct resource *res = attr->private;
1033 unsigned long port = off;
1036 for (i = 0; i < PCI_ROM_RESOURCE; i++)
1037 if (res == &pdev->resource[i])
1039 if (i >= PCI_ROM_RESOURCE)
1042 port += pci_resource_start(pdev, i);
1044 if (port > pci_resource_end(pdev, i))
1047 if (port + count - 1 > pci_resource_end(pdev, i))
1053 outb(*(u8 *)buf, port);
1055 *(u8 *)buf = inb(port);
1059 outw(*(u16 *)buf, port);
1061 *(u16 *)buf = inw(port);
1065 outl(*(u32 *)buf, port);
1067 *(u32 *)buf = inl(port);
1074 pci_read_resource_io(struct file *filp, struct kobject *kobj,
1075 struct bin_attribute *attr, char *buf,
1076 loff_t off, size_t count)
1078 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1082 pci_write_resource_io(struct file *filp, struct kobject *kobj,
1083 struct bin_attribute *attr, char *buf,
1084 loff_t off, size_t count)
1086 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1090 * pci_remove_resource_files - cleanup resource files
1091 * @pdev: dev to cleanup
1093 * If we created resource files for @pdev, remove them from sysfs and
1094 * free their resources.
1097 pci_remove_resource_files(struct pci_dev *pdev)
1101 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1102 struct bin_attribute *res_attr;
1104 res_attr = pdev->res_attr[i];
1106 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1110 res_attr = pdev->res_attr_wc[i];
1112 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1118 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1120 /* allocate attribute structure, piggyback attribute name */
1121 int name_len = write_combine ? 13 : 10;
1122 struct bin_attribute *res_attr;
1125 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1127 char *res_attr_name = (char *)(res_attr + 1);
1129 sysfs_bin_attr_init(res_attr);
1130 if (write_combine) {
1131 pdev->res_attr_wc[num] = res_attr;
1132 sprintf(res_attr_name, "resource%d_wc", num);
1133 res_attr->mmap = pci_mmap_resource_wc;
1135 pdev->res_attr[num] = res_attr;
1136 sprintf(res_attr_name, "resource%d", num);
1137 res_attr->mmap = pci_mmap_resource_uc;
1139 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1140 res_attr->read = pci_read_resource_io;
1141 res_attr->write = pci_write_resource_io;
1143 res_attr->attr.name = res_attr_name;
1144 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1145 res_attr->size = pci_resource_len(pdev, num);
1146 res_attr->private = &pdev->resource[num];
1147 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1155 * pci_create_resource_files - create resource files in sysfs for @dev
1156 * @pdev: dev in question
1158 * Walk the resources in @pdev creating files for each resource available.
1160 static int pci_create_resource_files(struct pci_dev *pdev)
1165 /* Expose the PCI resources from this device as files */
1166 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1168 /* skip empty resources */
1169 if (!pci_resource_len(pdev, i))
1172 retval = pci_create_attr(pdev, i, 0);
1173 /* for prefetchable resources, create a WC mappable file */
1174 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1175 retval = pci_create_attr(pdev, i, 1);
1178 pci_remove_resource_files(pdev);
1184 #else /* !HAVE_PCI_MMAP */
1185 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1186 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1187 #endif /* HAVE_PCI_MMAP */
1190 * pci_write_rom - used to enable access to the PCI ROM display
1192 * @kobj: kernel object handle
1193 * @bin_attr: struct bin_attribute for this file
1196 * @count: number of byte in input
1198 * writing anything except 0 enables it
1201 pci_write_rom(struct file *filp, struct kobject *kobj,
1202 struct bin_attribute *bin_attr,
1203 char *buf, loff_t off, size_t count)
1205 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1207 if ((off == 0) && (*buf == '0') && (count == 2))
1208 pdev->rom_attr_enabled = 0;
1210 pdev->rom_attr_enabled = 1;
1216 * pci_read_rom - read a PCI ROM
1218 * @kobj: kernel object handle
1219 * @bin_attr: struct bin_attribute for this file
1220 * @buf: where to put the data we read from the ROM
1222 * @count: number of bytes to read
1224 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1225 * device corresponding to @kobj.
1228 pci_read_rom(struct file *filp, struct kobject *kobj,
1229 struct bin_attribute *bin_attr,
1230 char *buf, loff_t off, size_t count)
1232 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1236 if (!pdev->rom_attr_enabled)
1239 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1246 if (off + count > size)
1249 memcpy_fromio(buf, rom + off, count);
1251 pci_unmap_rom(pdev, rom);
1256 static struct bin_attribute pci_config_attr = {
1259 .mode = S_IRUGO | S_IWUSR,
1261 .size = PCI_CFG_SPACE_SIZE,
1262 .read = pci_read_config,
1263 .write = pci_write_config,
1266 static struct bin_attribute pcie_config_attr = {
1269 .mode = S_IRUGO | S_IWUSR,
1271 .size = PCI_CFG_SPACE_EXP_SIZE,
1272 .read = pci_read_config,
1273 .write = pci_write_config,
1276 int __weak pcibios_add_platform_entries(struct pci_dev *dev)
1281 static ssize_t reset_store(struct device *dev,
1282 struct device_attribute *attr, const char *buf,
1285 struct pci_dev *pdev = to_pci_dev(dev);
1287 ssize_t result = kstrtoul(buf, 0, &val);
1295 result = pci_reset_function(pdev);
1302 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1304 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1307 struct bin_attribute *attr;
1309 /* If the device has VPD, try to expose it in sysfs. */
1311 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1315 sysfs_bin_attr_init(attr);
1316 attr->size = dev->vpd->len;
1317 attr->attr.name = "vpd";
1318 attr->attr.mode = S_IRUSR | S_IWUSR;
1319 attr->read = read_vpd_attr;
1320 attr->write = write_vpd_attr;
1321 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1326 dev->vpd->attr = attr;
1329 /* Active State Power Management */
1330 pcie_aspm_create_sysfs_dev_files(dev);
1332 if (!pci_probe_reset_function(dev)) {
1333 retval = device_create_file(&dev->dev, &reset_attr);
1341 pcie_aspm_remove_sysfs_dev_files(dev);
1342 if (dev->vpd && dev->vpd->attr) {
1343 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1344 kfree(dev->vpd->attr);
1350 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1354 struct bin_attribute *attr;
1356 if (!sysfs_initialized)
1359 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1360 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1362 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1366 retval = pci_create_resource_files(pdev);
1368 goto err_config_file;
1370 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1371 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1372 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1375 /* If the device has a ROM, try to expose it in sysfs. */
1377 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1380 goto err_resource_files;
1382 sysfs_bin_attr_init(attr);
1383 attr->size = rom_size;
1384 attr->attr.name = "rom";
1385 attr->attr.mode = S_IRUSR | S_IWUSR;
1386 attr->read = pci_read_rom;
1387 attr->write = pci_write_rom;
1388 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1391 goto err_resource_files;
1393 pdev->rom_attr = attr;
1396 /* add platform-specific attributes */
1397 retval = pcibios_add_platform_entries(pdev);
1401 /* add sysfs entries for various capabilities */
1402 retval = pci_create_capabilities_sysfs(pdev);
1406 pci_create_firmware_label_files(pdev);
1412 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1413 kfree(pdev->rom_attr);
1414 pdev->rom_attr = NULL;
1417 pci_remove_resource_files(pdev);
1419 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1420 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1422 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1427 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1429 if (dev->vpd && dev->vpd->attr) {
1430 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1431 kfree(dev->vpd->attr);
1434 pcie_aspm_remove_sysfs_dev_files(dev);
1435 if (dev->reset_fn) {
1436 device_remove_file(&dev->dev, &reset_attr);
1442 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1443 * @pdev: device whose entries we should free
1445 * Cleanup when @pdev is removed from sysfs.
1447 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1451 if (!sysfs_initialized)
1454 pci_remove_capabilities_sysfs(pdev);
1456 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1457 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1459 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1461 pci_remove_resource_files(pdev);
1463 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1464 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1465 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1468 if (rom_size && pdev->rom_attr) {
1469 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1470 kfree(pdev->rom_attr);
1473 pci_remove_firmware_label_files(pdev);
1477 static int __init pci_sysfs_init(void)
1479 struct pci_dev *pdev = NULL;
1482 sysfs_initialized = 1;
1483 for_each_pci_dev(pdev) {
1484 retval = pci_create_sysfs_dev_files(pdev);
1494 late_initcall(pci_sysfs_init);
1496 static struct attribute *pci_dev_dev_attrs[] = {
1501 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1502 struct attribute *a, int n)
1504 struct device *dev = container_of(kobj, struct device, kobj);
1505 struct pci_dev *pdev = to_pci_dev(dev);
1507 if (a == &vga_attr.attr)
1508 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1514 static struct attribute *pci_dev_hp_attrs[] = {
1515 &dev_remove_attr.attr,
1516 &dev_rescan_attr.attr,
1520 static umode_t pci_dev_hp_attrs_are_visible(struct kobject *kobj,
1521 struct attribute *a, int n)
1523 struct device *dev = container_of(kobj, struct device, kobj);
1524 struct pci_dev *pdev = to_pci_dev(dev);
1526 if (pdev->is_virtfn)
1532 static struct attribute_group pci_dev_hp_attr_group = {
1533 .attrs = pci_dev_hp_attrs,
1534 .is_visible = pci_dev_hp_attrs_are_visible,
1537 #ifdef CONFIG_PCI_IOV
1538 static struct attribute *sriov_dev_attrs[] = {
1539 &sriov_totalvfs_attr.attr,
1540 &sriov_numvfs_attr.attr,
1544 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1545 struct attribute *a, int n)
1547 struct device *dev = container_of(kobj, struct device, kobj);
1549 if (!dev_is_pf(dev))
1555 static struct attribute_group sriov_dev_attr_group = {
1556 .attrs = sriov_dev_attrs,
1557 .is_visible = sriov_attrs_are_visible,
1559 #endif /* CONFIG_PCI_IOV */
1561 static struct attribute_group pci_dev_attr_group = {
1562 .attrs = pci_dev_dev_attrs,
1563 .is_visible = pci_dev_attrs_are_visible,
1566 static const struct attribute_group *pci_dev_attr_groups[] = {
1567 &pci_dev_attr_group,
1568 &pci_dev_hp_attr_group,
1569 #ifdef CONFIG_PCI_IOV
1570 &sriov_dev_attr_group,
1575 struct device_type pci_dev_type = {
1576 .groups = pci_dev_attr_groups,