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); \
47 pci_config_attr(vendor, "0x%04x\n");
48 pci_config_attr(device, "0x%04x\n");
49 pci_config_attr(subsystem_vendor, "0x%04x\n");
50 pci_config_attr(subsystem_device, "0x%04x\n");
51 pci_config_attr(class, "0x%06x\n");
52 pci_config_attr(irq, "%u\n");
54 static ssize_t broken_parity_status_show(struct device *dev,
55 struct device_attribute *attr,
58 struct pci_dev *pdev = to_pci_dev(dev);
59 return sprintf (buf, "%u\n", pdev->broken_parity_status);
62 static ssize_t broken_parity_status_store(struct device *dev,
63 struct device_attribute *attr,
64 const char *buf, size_t count)
66 struct pci_dev *pdev = to_pci_dev(dev);
69 if (strict_strtoul(buf, 0, &val) < 0)
72 pdev->broken_parity_status = !!val;
77 static ssize_t local_cpus_show(struct device *dev,
78 struct device_attribute *attr, char *buf)
80 const struct cpumask *mask;
84 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
85 cpumask_of_node(dev_to_node(dev));
87 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
89 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
96 static ssize_t local_cpulist_show(struct device *dev,
97 struct device_attribute *attr, char *buf)
99 const struct cpumask *mask;
103 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
104 cpumask_of_node(dev_to_node(dev));
106 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
108 len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
115 * PCI Bus Class Devices
117 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
119 struct device_attribute *attr,
123 const struct cpumask *cpumask;
125 cpumask = cpumask_of_pcibus(to_pci_bus(dev));
127 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
128 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
134 static inline ssize_t pci_bus_show_cpumaskaffinity(struct device *dev,
135 struct device_attribute *attr,
138 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
141 static inline ssize_t pci_bus_show_cpulistaffinity(struct device *dev,
142 struct device_attribute *attr,
145 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
150 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
152 struct pci_dev * pci_dev = to_pci_dev(dev);
156 resource_size_t start, end;
158 if (pci_dev->subordinate)
159 max = DEVICE_COUNT_RESOURCE;
161 max = PCI_BRIDGE_RESOURCES;
163 for (i = 0; i < max; i++) {
164 struct resource *res = &pci_dev->resource[i];
165 pci_resource_to_user(pci_dev, i, res, &start, &end);
166 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
167 (unsigned long long)start,
168 (unsigned long long)end,
169 (unsigned long long)res->flags);
174 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
176 struct pci_dev *pci_dev = to_pci_dev(dev);
178 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
179 pci_dev->vendor, pci_dev->device,
180 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
181 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
182 (u8)(pci_dev->class));
185 static ssize_t is_enabled_store(struct device *dev,
186 struct device_attribute *attr, const char *buf,
189 struct pci_dev *pdev = to_pci_dev(dev);
191 ssize_t result = strict_strtoul(buf, 0, &val);
196 /* this can crash the machine when done on the "wrong" device */
197 if (!capable(CAP_SYS_ADMIN))
201 if (pci_is_enabled(pdev))
202 pci_disable_device(pdev);
206 result = pci_enable_device(pdev);
208 return result < 0 ? result : count;
211 static ssize_t is_enabled_show(struct device *dev,
212 struct device_attribute *attr, char *buf)
214 struct pci_dev *pdev;
216 pdev = to_pci_dev (dev);
217 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
222 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
224 return sprintf (buf, "%d\n", dev->numa_node);
229 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
231 struct pci_dev *pdev = to_pci_dev(dev);
233 return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
237 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
240 return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
244 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
246 struct pci_dev *pdev = to_pci_dev(dev);
248 if (!pdev->subordinate)
251 return sprintf (buf, "%u\n",
252 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
256 msi_bus_store(struct device *dev, struct device_attribute *attr,
257 const char *buf, size_t count)
259 struct pci_dev *pdev = to_pci_dev(dev);
262 if (strict_strtoul(buf, 0, &val) < 0)
265 /* bad things may happen if the no_msi flag is changed
266 * while some drivers are loaded */
267 if (!capable(CAP_SYS_ADMIN))
270 /* Maybe pci devices without subordinate busses shouldn't even have this
271 * attribute in the first place? */
272 if (!pdev->subordinate)
275 /* Is the flag going to change, or keep the value it already had? */
276 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
278 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
280 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
281 " bad things could happen\n", val ? "" : " not");
287 static DEFINE_MUTEX(pci_remove_rescan_mutex);
288 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
292 struct pci_bus *b = NULL;
294 if (strict_strtoul(buf, 0, &val) < 0)
298 mutex_lock(&pci_remove_rescan_mutex);
299 while ((b = pci_find_next_bus(b)) != NULL)
301 mutex_unlock(&pci_remove_rescan_mutex);
306 struct bus_attribute pci_bus_attrs[] = {
307 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
312 dev_rescan_store(struct device *dev, struct device_attribute *attr,
313 const char *buf, size_t count)
316 struct pci_dev *pdev = to_pci_dev(dev);
318 if (strict_strtoul(buf, 0, &val) < 0)
322 mutex_lock(&pci_remove_rescan_mutex);
323 pci_rescan_bus(pdev->bus);
324 mutex_unlock(&pci_remove_rescan_mutex);
329 static void remove_callback(struct device *dev)
331 struct pci_dev *pdev = to_pci_dev(dev);
333 mutex_lock(&pci_remove_rescan_mutex);
334 pci_stop_and_remove_bus_device(pdev);
335 mutex_unlock(&pci_remove_rescan_mutex);
339 remove_store(struct device *dev, struct device_attribute *dummy,
340 const char *buf, size_t count)
345 if (strict_strtoul(buf, 0, &val) < 0)
348 /* An attribute cannot be unregistered by one of its own methods,
349 * so we have to use this roundabout approach.
352 ret = device_schedule_callback(dev, remove_callback);
359 dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
360 const char *buf, size_t count)
363 struct pci_bus *bus = to_pci_bus(dev);
365 if (strict_strtoul(buf, 0, &val) < 0)
369 mutex_lock(&pci_remove_rescan_mutex);
370 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
371 pci_rescan_bus_bridge_resize(bus->self);
374 mutex_unlock(&pci_remove_rescan_mutex);
379 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
380 static ssize_t d3cold_allowed_store(struct device *dev,
381 struct device_attribute *attr,
382 const char *buf, size_t count)
384 struct pci_dev *pdev = to_pci_dev(dev);
387 if (strict_strtoul(buf, 0, &val) < 0)
390 pdev->d3cold_allowed = !!val;
391 pm_runtime_resume(dev);
396 static ssize_t d3cold_allowed_show(struct device *dev,
397 struct device_attribute *attr, char *buf)
399 struct pci_dev *pdev = to_pci_dev(dev);
400 return sprintf (buf, "%u\n", pdev->d3cold_allowed);
404 #ifdef CONFIG_PCI_IOV
405 static ssize_t sriov_totalvfs_show(struct device *dev,
406 struct device_attribute *attr,
409 struct pci_dev *pdev = to_pci_dev(dev);
411 return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
415 static ssize_t sriov_numvfs_show(struct device *dev,
416 struct device_attribute *attr,
419 struct pci_dev *pdev = to_pci_dev(dev);
421 return sprintf(buf, "%u\n", pdev->sriov->num_VFs);
425 * num_vfs > 0; number of VFs to enable
426 * num_vfs = 0; disable all VFs
428 * Note: SRIOV spec doesn't allow partial VF
429 * disable, so it's all or none.
431 static ssize_t sriov_numvfs_store(struct device *dev,
432 struct device_attribute *attr,
433 const char *buf, size_t count)
435 struct pci_dev *pdev = to_pci_dev(dev);
439 ret = kstrtou16(buf, 0, &num_vfs);
443 if (num_vfs > pci_sriov_get_totalvfs(pdev))
446 if (num_vfs == pdev->sriov->num_VFs)
447 return count; /* no change */
449 /* is PF driver loaded w/callback */
450 if (!pdev->driver || !pdev->driver->sriov_configure) {
451 dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
457 ret = pdev->driver->sriov_configure(pdev, 0);
464 if (pdev->sriov->num_VFs) {
465 dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
466 pdev->sriov->num_VFs, num_vfs);
470 ret = pdev->driver->sriov_configure(pdev, num_vfs);
475 dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
481 static struct device_attribute sriov_totalvfs_attr = __ATTR_RO(sriov_totalvfs);
482 static struct device_attribute sriov_numvfs_attr =
483 __ATTR(sriov_numvfs, (S_IRUGO|S_IWUSR|S_IWGRP),
484 sriov_numvfs_show, sriov_numvfs_store);
485 #endif /* CONFIG_PCI_IOV */
487 struct device_attribute pci_dev_attrs[] = {
491 __ATTR_RO(subsystem_vendor),
492 __ATTR_RO(subsystem_device),
495 __ATTR_RO(local_cpus),
496 __ATTR_RO(local_cpulist),
499 __ATTR_RO(numa_node),
501 __ATTR_RO(dma_mask_bits),
502 __ATTR_RO(consistent_dma_mask_bits),
503 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
504 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
505 broken_parity_status_show,broken_parity_status_store),
506 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
507 __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
508 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
509 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
510 __ATTR(d3cold_allowed, 0644, d3cold_allowed_show, d3cold_allowed_store),
515 struct device_attribute pcibus_dev_attrs[] = {
516 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store),
517 __ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL),
518 __ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL),
523 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
525 struct pci_dev *pdev = to_pci_dev(dev);
526 struct pci_dev *vga_dev = vga_default_device();
529 return sprintf(buf, "%u\n", (pdev == vga_dev));
531 return sprintf(buf, "%u\n",
532 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
533 IORESOURCE_ROM_SHADOW));
535 struct device_attribute vga_attr = __ATTR_RO(boot_vga);
538 pci_read_config(struct file *filp, struct kobject *kobj,
539 struct bin_attribute *bin_attr,
540 char *buf, loff_t off, size_t count)
542 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
543 unsigned int size = 64;
544 loff_t init_off = off;
545 u8 *data = (u8*) buf;
547 /* Several chips lock up trying to read undefined config space */
548 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
549 size = dev->cfg_size;
550 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
556 if (off + count > size) {
563 pci_config_pm_runtime_get(dev);
565 if ((off & 1) && size) {
567 pci_user_read_config_byte(dev, off, &val);
568 data[off - init_off] = val;
573 if ((off & 3) && size > 2) {
575 pci_user_read_config_word(dev, off, &val);
576 data[off - init_off] = val & 0xff;
577 data[off - init_off + 1] = (val >> 8) & 0xff;
584 pci_user_read_config_dword(dev, off, &val);
585 data[off - init_off] = val & 0xff;
586 data[off - init_off + 1] = (val >> 8) & 0xff;
587 data[off - init_off + 2] = (val >> 16) & 0xff;
588 data[off - init_off + 3] = (val >> 24) & 0xff;
595 pci_user_read_config_word(dev, off, &val);
596 data[off - init_off] = val & 0xff;
597 data[off - init_off + 1] = (val >> 8) & 0xff;
604 pci_user_read_config_byte(dev, off, &val);
605 data[off - init_off] = val;
610 pci_config_pm_runtime_put(dev);
616 pci_write_config(struct file* filp, struct kobject *kobj,
617 struct bin_attribute *bin_attr,
618 char *buf, loff_t off, size_t count)
620 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
621 unsigned int size = count;
622 loff_t init_off = off;
623 u8 *data = (u8*) buf;
625 if (off > dev->cfg_size)
627 if (off + count > dev->cfg_size) {
628 size = dev->cfg_size - off;
632 pci_config_pm_runtime_get(dev);
634 if ((off & 1) && size) {
635 pci_user_write_config_byte(dev, off, data[off - init_off]);
640 if ((off & 3) && size > 2) {
641 u16 val = data[off - init_off];
642 val |= (u16) data[off - init_off + 1] << 8;
643 pci_user_write_config_word(dev, off, val);
649 u32 val = data[off - init_off];
650 val |= (u32) data[off - init_off + 1] << 8;
651 val |= (u32) data[off - init_off + 2] << 16;
652 val |= (u32) data[off - init_off + 3] << 24;
653 pci_user_write_config_dword(dev, off, val);
659 u16 val = data[off - init_off];
660 val |= (u16) data[off - init_off + 1] << 8;
661 pci_user_write_config_word(dev, off, val);
667 pci_user_write_config_byte(dev, off, data[off - init_off]);
672 pci_config_pm_runtime_put(dev);
678 read_vpd_attr(struct file *filp, struct kobject *kobj,
679 struct bin_attribute *bin_attr,
680 char *buf, loff_t off, size_t count)
682 struct pci_dev *dev =
683 to_pci_dev(container_of(kobj, struct device, kobj));
685 if (off > bin_attr->size)
687 else if (count > bin_attr->size - off)
688 count = bin_attr->size - off;
690 return pci_read_vpd(dev, off, count, buf);
694 write_vpd_attr(struct file *filp, struct kobject *kobj,
695 struct bin_attribute *bin_attr,
696 char *buf, loff_t off, size_t count)
698 struct pci_dev *dev =
699 to_pci_dev(container_of(kobj, struct device, kobj));
701 if (off > bin_attr->size)
703 else if (count > bin_attr->size - off)
704 count = bin_attr->size - off;
706 return pci_write_vpd(dev, off, count, buf);
709 #ifdef HAVE_PCI_LEGACY
711 * pci_read_legacy_io - read byte(s) from legacy I/O port space
712 * @filp: open sysfs file
713 * @kobj: kobject corresponding to file to read from
714 * @bin_attr: struct bin_attribute for this file
715 * @buf: buffer to store results
716 * @off: offset into legacy I/O port space
717 * @count: number of bytes to read
719 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
720 * callback routine (pci_legacy_read).
723 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
724 struct bin_attribute *bin_attr,
725 char *buf, loff_t off, size_t count)
727 struct pci_bus *bus = to_pci_bus(container_of(kobj,
731 /* Only support 1, 2 or 4 byte accesses */
732 if (count != 1 && count != 2 && count != 4)
735 return pci_legacy_read(bus, off, (u32 *)buf, count);
739 * pci_write_legacy_io - write byte(s) to legacy I/O port space
740 * @filp: open sysfs file
741 * @kobj: kobject corresponding to file to read from
742 * @bin_attr: struct bin_attribute for this file
743 * @buf: buffer containing value to be written
744 * @off: offset into legacy I/O port space
745 * @count: number of bytes to write
747 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
748 * callback routine (pci_legacy_write).
751 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
752 struct bin_attribute *bin_attr,
753 char *buf, loff_t off, size_t count)
755 struct pci_bus *bus = to_pci_bus(container_of(kobj,
758 /* Only support 1, 2 or 4 byte accesses */
759 if (count != 1 && count != 2 && count != 4)
762 return pci_legacy_write(bus, off, *(u32 *)buf, count);
766 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
767 * @filp: open sysfs file
768 * @kobj: kobject corresponding to device to be mapped
769 * @attr: struct bin_attribute for this file
770 * @vma: struct vm_area_struct passed to mmap
772 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
773 * legacy memory space (first meg of bus space) into application virtual
777 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
778 struct bin_attribute *attr,
779 struct vm_area_struct *vma)
781 struct pci_bus *bus = to_pci_bus(container_of(kobj,
785 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
789 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
790 * @filp: open sysfs file
791 * @kobj: kobject corresponding to device to be mapped
792 * @attr: struct bin_attribute for this file
793 * @vma: struct vm_area_struct passed to mmap
795 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
796 * legacy IO space (first meg of bus space) into application virtual
797 * memory space. Returns -ENOSYS if the operation isn't supported
800 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
801 struct bin_attribute *attr,
802 struct vm_area_struct *vma)
804 struct pci_bus *bus = to_pci_bus(container_of(kobj,
808 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
812 * pci_adjust_legacy_attr - adjustment of legacy file attributes
813 * @b: bus to create files under
814 * @mmap_type: I/O port or memory
816 * Stub implementation. Can be overridden by arch if necessary.
819 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
825 * pci_create_legacy_files - create legacy I/O port and memory files
826 * @b: bus to create files under
828 * Some platforms allow access to legacy I/O port and ISA memory space on
829 * a per-bus basis. This routine creates the files and ties them into
830 * their associated read, write and mmap files from pci-sysfs.c
832 * On error unwind, but don't propagate the error to the caller
833 * as it is ok to set up the PCI bus without these files.
835 void pci_create_legacy_files(struct pci_bus *b)
839 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
844 sysfs_bin_attr_init(b->legacy_io);
845 b->legacy_io->attr.name = "legacy_io";
846 b->legacy_io->size = 0xffff;
847 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
848 b->legacy_io->read = pci_read_legacy_io;
849 b->legacy_io->write = pci_write_legacy_io;
850 b->legacy_io->mmap = pci_mmap_legacy_io;
851 pci_adjust_legacy_attr(b, pci_mmap_io);
852 error = device_create_bin_file(&b->dev, b->legacy_io);
856 /* Allocated above after the legacy_io struct */
857 b->legacy_mem = b->legacy_io + 1;
858 sysfs_bin_attr_init(b->legacy_mem);
859 b->legacy_mem->attr.name = "legacy_mem";
860 b->legacy_mem->size = 1024*1024;
861 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
862 b->legacy_mem->mmap = pci_mmap_legacy_mem;
863 pci_adjust_legacy_attr(b, pci_mmap_mem);
864 error = device_create_bin_file(&b->dev, b->legacy_mem);
871 device_remove_bin_file(&b->dev, b->legacy_io);
876 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
877 "and ISA memory resources to sysfs\n");
881 void pci_remove_legacy_files(struct pci_bus *b)
884 device_remove_bin_file(&b->dev, b->legacy_io);
885 device_remove_bin_file(&b->dev, b->legacy_mem);
886 kfree(b->legacy_io); /* both are allocated here */
889 #endif /* HAVE_PCI_LEGACY */
893 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
894 enum pci_mmap_api mmap_api)
896 unsigned long nr, start, size, pci_start;
898 if (pci_resource_len(pdev, resno) == 0)
900 nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
901 start = vma->vm_pgoff;
902 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
903 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
904 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
905 if (start >= pci_start && start < pci_start + size &&
906 start + nr <= pci_start + size)
912 * pci_mmap_resource - map a PCI resource into user memory space
913 * @kobj: kobject for mapping
914 * @attr: struct bin_attribute for the file being mapped
915 * @vma: struct vm_area_struct passed into the mmap
916 * @write_combine: 1 for write_combine mapping
918 * Use the regular PCI mapping routines to map a PCI resource into userspace.
921 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
922 struct vm_area_struct *vma, int write_combine)
924 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
925 struct device, kobj));
926 struct resource *res = attr->private;
927 enum pci_mmap_state mmap_type;
928 resource_size_t start, end;
931 for (i = 0; i < PCI_ROM_RESOURCE; i++)
932 if (res == &pdev->resource[i])
934 if (i >= PCI_ROM_RESOURCE)
937 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
938 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
939 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
940 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
942 (u64)pci_resource_start(pdev, i),
943 (u64)pci_resource_len(pdev, i));
947 /* pci_mmap_page_range() expects the same kind of entry as coming
948 * from /proc/bus/pci/ which is a "user visible" value. If this is
949 * different from the resource itself, arch will do necessary fixup.
951 pci_resource_to_user(pdev, i, res, &start, &end);
952 vma->vm_pgoff += start >> PAGE_SHIFT;
953 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
955 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
958 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
962 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
963 struct bin_attribute *attr,
964 struct vm_area_struct *vma)
966 return pci_mmap_resource(kobj, attr, vma, 0);
970 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
971 struct bin_attribute *attr,
972 struct vm_area_struct *vma)
974 return pci_mmap_resource(kobj, attr, vma, 1);
978 pci_resource_io(struct file *filp, struct kobject *kobj,
979 struct bin_attribute *attr, char *buf,
980 loff_t off, size_t count, bool write)
982 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
983 struct device, kobj));
984 struct resource *res = attr->private;
985 unsigned long port = off;
988 for (i = 0; i < PCI_ROM_RESOURCE; i++)
989 if (res == &pdev->resource[i])
991 if (i >= PCI_ROM_RESOURCE)
994 port += pci_resource_start(pdev, i);
996 if (port > pci_resource_end(pdev, i))
999 if (port + count - 1 > pci_resource_end(pdev, i))
1005 outb(*(u8 *)buf, port);
1007 *(u8 *)buf = inb(port);
1011 outw(*(u16 *)buf, port);
1013 *(u16 *)buf = inw(port);
1017 outl(*(u32 *)buf, port);
1019 *(u32 *)buf = inl(port);
1026 pci_read_resource_io(struct file *filp, struct kobject *kobj,
1027 struct bin_attribute *attr, char *buf,
1028 loff_t off, size_t count)
1030 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
1034 pci_write_resource_io(struct file *filp, struct kobject *kobj,
1035 struct bin_attribute *attr, char *buf,
1036 loff_t off, size_t count)
1038 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
1042 * pci_remove_resource_files - cleanup resource files
1043 * @pdev: dev to cleanup
1045 * If we created resource files for @pdev, remove them from sysfs and
1046 * free their resources.
1049 pci_remove_resource_files(struct pci_dev *pdev)
1053 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1054 struct bin_attribute *res_attr;
1056 res_attr = pdev->res_attr[i];
1058 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1062 res_attr = pdev->res_attr_wc[i];
1064 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
1070 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
1072 /* allocate attribute structure, piggyback attribute name */
1073 int name_len = write_combine ? 13 : 10;
1074 struct bin_attribute *res_attr;
1077 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
1079 char *res_attr_name = (char *)(res_attr + 1);
1081 sysfs_bin_attr_init(res_attr);
1082 if (write_combine) {
1083 pdev->res_attr_wc[num] = res_attr;
1084 sprintf(res_attr_name, "resource%d_wc", num);
1085 res_attr->mmap = pci_mmap_resource_wc;
1087 pdev->res_attr[num] = res_attr;
1088 sprintf(res_attr_name, "resource%d", num);
1089 res_attr->mmap = pci_mmap_resource_uc;
1091 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1092 res_attr->read = pci_read_resource_io;
1093 res_attr->write = pci_write_resource_io;
1095 res_attr->attr.name = res_attr_name;
1096 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1097 res_attr->size = pci_resource_len(pdev, num);
1098 res_attr->private = &pdev->resource[num];
1099 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1107 * pci_create_resource_files - create resource files in sysfs for @dev
1108 * @pdev: dev in question
1110 * Walk the resources in @pdev creating files for each resource available.
1112 static int pci_create_resource_files(struct pci_dev *pdev)
1117 /* Expose the PCI resources from this device as files */
1118 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1120 /* skip empty resources */
1121 if (!pci_resource_len(pdev, i))
1124 retval = pci_create_attr(pdev, i, 0);
1125 /* for prefetchable resources, create a WC mappable file */
1126 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1127 retval = pci_create_attr(pdev, i, 1);
1130 pci_remove_resource_files(pdev);
1136 #else /* !HAVE_PCI_MMAP */
1137 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1138 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1139 #endif /* HAVE_PCI_MMAP */
1142 * pci_write_rom - used to enable access to the PCI ROM display
1144 * @kobj: kernel object handle
1145 * @bin_attr: struct bin_attribute for this file
1148 * @count: number of byte in input
1150 * writing anything except 0 enables it
1153 pci_write_rom(struct file *filp, struct kobject *kobj,
1154 struct bin_attribute *bin_attr,
1155 char *buf, loff_t off, size_t count)
1157 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1159 if ((off == 0) && (*buf == '0') && (count == 2))
1160 pdev->rom_attr_enabled = 0;
1162 pdev->rom_attr_enabled = 1;
1168 * pci_read_rom - read a PCI ROM
1170 * @kobj: kernel object handle
1171 * @bin_attr: struct bin_attribute for this file
1172 * @buf: where to put the data we read from the ROM
1174 * @count: number of bytes to read
1176 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1177 * device corresponding to @kobj.
1180 pci_read_rom(struct file *filp, struct kobject *kobj,
1181 struct bin_attribute *bin_attr,
1182 char *buf, loff_t off, size_t count)
1184 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1188 if (!pdev->rom_attr_enabled)
1191 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1198 if (off + count > size)
1201 memcpy_fromio(buf, rom + off, count);
1203 pci_unmap_rom(pdev, rom);
1208 static struct bin_attribute pci_config_attr = {
1211 .mode = S_IRUGO | S_IWUSR,
1213 .size = PCI_CFG_SPACE_SIZE,
1214 .read = pci_read_config,
1215 .write = pci_write_config,
1218 static struct bin_attribute pcie_config_attr = {
1221 .mode = S_IRUGO | S_IWUSR,
1223 .size = PCI_CFG_SPACE_EXP_SIZE,
1224 .read = pci_read_config,
1225 .write = pci_write_config,
1228 int __weak pcibios_add_platform_entries(struct pci_dev *dev)
1233 static ssize_t reset_store(struct device *dev,
1234 struct device_attribute *attr, const char *buf,
1237 struct pci_dev *pdev = to_pci_dev(dev);
1239 ssize_t result = strict_strtoul(buf, 0, &val);
1247 result = pci_reset_function(pdev);
1254 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1256 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1259 struct bin_attribute *attr;
1261 /* If the device has VPD, try to expose it in sysfs. */
1263 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1267 sysfs_bin_attr_init(attr);
1268 attr->size = dev->vpd->len;
1269 attr->attr.name = "vpd";
1270 attr->attr.mode = S_IRUSR | S_IWUSR;
1271 attr->read = read_vpd_attr;
1272 attr->write = write_vpd_attr;
1273 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1278 dev->vpd->attr = attr;
1281 /* Active State Power Management */
1282 pcie_aspm_create_sysfs_dev_files(dev);
1284 if (!pci_probe_reset_function(dev)) {
1285 retval = device_create_file(&dev->dev, &reset_attr);
1293 pcie_aspm_remove_sysfs_dev_files(dev);
1294 if (dev->vpd && dev->vpd->attr) {
1295 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1296 kfree(dev->vpd->attr);
1302 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1306 struct bin_attribute *attr;
1308 if (!sysfs_initialized)
1311 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1312 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1314 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1318 retval = pci_create_resource_files(pdev);
1320 goto err_config_file;
1322 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1323 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1324 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1327 /* If the device has a ROM, try to expose it in sysfs. */
1329 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1332 goto err_resource_files;
1334 sysfs_bin_attr_init(attr);
1335 attr->size = rom_size;
1336 attr->attr.name = "rom";
1337 attr->attr.mode = S_IRUSR | S_IWUSR;
1338 attr->read = pci_read_rom;
1339 attr->write = pci_write_rom;
1340 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1343 goto err_resource_files;
1345 pdev->rom_attr = attr;
1348 /* add platform-specific attributes */
1349 retval = pcibios_add_platform_entries(pdev);
1353 /* add sysfs entries for various capabilities */
1354 retval = pci_create_capabilities_sysfs(pdev);
1358 pci_create_firmware_label_files(pdev);
1364 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1365 kfree(pdev->rom_attr);
1366 pdev->rom_attr = NULL;
1369 pci_remove_resource_files(pdev);
1371 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1372 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1374 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1379 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1381 if (dev->vpd && dev->vpd->attr) {
1382 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1383 kfree(dev->vpd->attr);
1386 pcie_aspm_remove_sysfs_dev_files(dev);
1387 if (dev->reset_fn) {
1388 device_remove_file(&dev->dev, &reset_attr);
1394 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1395 * @pdev: device whose entries we should free
1397 * Cleanup when @pdev is removed from sysfs.
1399 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1403 if (!sysfs_initialized)
1406 pci_remove_capabilities_sysfs(pdev);
1408 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1409 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1411 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1413 pci_remove_resource_files(pdev);
1415 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1416 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1417 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1420 if (rom_size && pdev->rom_attr) {
1421 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1422 kfree(pdev->rom_attr);
1425 pci_remove_firmware_label_files(pdev);
1429 static int __init pci_sysfs_init(void)
1431 struct pci_dev *pdev = NULL;
1434 sysfs_initialized = 1;
1435 for_each_pci_dev(pdev) {
1436 retval = pci_create_sysfs_dev_files(pdev);
1446 late_initcall(pci_sysfs_init);
1448 static struct attribute *pci_dev_dev_attrs[] = {
1453 static umode_t pci_dev_attrs_are_visible(struct kobject *kobj,
1454 struct attribute *a, int n)
1456 struct device *dev = container_of(kobj, struct device, kobj);
1457 struct pci_dev *pdev = to_pci_dev(dev);
1459 if (a == &vga_attr.attr)
1460 if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1466 #ifdef CONFIG_PCI_IOV
1467 static struct attribute *sriov_dev_attrs[] = {
1468 &sriov_totalvfs_attr.attr,
1469 &sriov_numvfs_attr.attr,
1473 static umode_t sriov_attrs_are_visible(struct kobject *kobj,
1474 struct attribute *a, int n)
1476 struct device *dev = container_of(kobj, struct device, kobj);
1478 if (!dev_is_pf(dev))
1484 static struct attribute_group sriov_dev_attr_group = {
1485 .attrs = sriov_dev_attrs,
1486 .is_visible = sriov_attrs_are_visible,
1488 #endif /* CONFIG_PCI_IOV */
1490 static struct attribute_group pci_dev_attr_group = {
1491 .attrs = pci_dev_dev_attrs,
1492 .is_visible = pci_dev_attrs_are_visible,
1495 static const struct attribute_group *pci_dev_attr_groups[] = {
1496 &pci_dev_attr_group,
1497 #ifdef CONFIG_PCI_IOV
1498 &sriov_dev_attr_group,
1503 struct device_type pci_dev_type = {
1504 .groups = pci_dev_attr_groups,