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>
32 static int sysfs_initialized; /* = 0 */
34 /* show configuration fields */
35 #define pci_config_attr(field, format_string) \
37 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
39 struct pci_dev *pdev; \
41 pdev = to_pci_dev (dev); \
42 return sprintf (buf, format_string, pdev->field); \
45 pci_config_attr(vendor, "0x%04x\n");
46 pci_config_attr(device, "0x%04x\n");
47 pci_config_attr(subsystem_vendor, "0x%04x\n");
48 pci_config_attr(subsystem_device, "0x%04x\n");
49 pci_config_attr(class, "0x%06x\n");
50 pci_config_attr(irq, "%u\n");
52 static ssize_t broken_parity_status_show(struct device *dev,
53 struct device_attribute *attr,
56 struct pci_dev *pdev = to_pci_dev(dev);
57 return sprintf (buf, "%u\n", pdev->broken_parity_status);
60 static ssize_t broken_parity_status_store(struct device *dev,
61 struct device_attribute *attr,
62 const char *buf, size_t count)
64 struct pci_dev *pdev = to_pci_dev(dev);
67 if (strict_strtoul(buf, 0, &val) < 0)
70 pdev->broken_parity_status = !!val;
75 static ssize_t local_cpus_show(struct device *dev,
76 struct device_attribute *attr, char *buf)
78 const struct cpumask *mask;
82 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
83 cpumask_of_node(dev_to_node(dev));
85 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
87 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
94 static ssize_t local_cpulist_show(struct device *dev,
95 struct device_attribute *attr, char *buf)
97 const struct cpumask *mask;
101 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
102 cpumask_of_node(dev_to_node(dev));
104 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
106 len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
113 * PCI Bus Class Devices
115 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
117 struct device_attribute *attr,
121 const struct cpumask *cpumask;
123 cpumask = cpumask_of_pcibus(to_pci_bus(dev));
125 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
126 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
132 static inline ssize_t pci_bus_show_cpumaskaffinity(struct device *dev,
133 struct device_attribute *attr,
136 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
139 static inline ssize_t pci_bus_show_cpulistaffinity(struct device *dev,
140 struct device_attribute *attr,
143 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
148 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
150 struct pci_dev * pci_dev = to_pci_dev(dev);
154 resource_size_t start, end;
156 if (pci_dev->subordinate)
157 max = DEVICE_COUNT_RESOURCE;
159 max = PCI_BRIDGE_RESOURCES;
161 for (i = 0; i < max; i++) {
162 struct resource *res = &pci_dev->resource[i];
163 pci_resource_to_user(pci_dev, i, res, &start, &end);
164 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
165 (unsigned long long)start,
166 (unsigned long long)end,
167 (unsigned long long)res->flags);
172 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
174 struct pci_dev *pci_dev = to_pci_dev(dev);
176 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
177 pci_dev->vendor, pci_dev->device,
178 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
179 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
180 (u8)(pci_dev->class));
183 static ssize_t is_enabled_store(struct device *dev,
184 struct device_attribute *attr, const char *buf,
187 struct pci_dev *pdev = to_pci_dev(dev);
189 ssize_t result = strict_strtoul(buf, 0, &val);
194 /* this can crash the machine when done on the "wrong" device */
195 if (!capable(CAP_SYS_ADMIN))
199 if (pci_is_enabled(pdev))
200 pci_disable_device(pdev);
204 result = pci_enable_device(pdev);
206 return result < 0 ? result : count;
209 static ssize_t is_enabled_show(struct device *dev,
210 struct device_attribute *attr, char *buf)
212 struct pci_dev *pdev;
214 pdev = to_pci_dev (dev);
215 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
220 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
222 return sprintf (buf, "%d\n", dev->numa_node);
227 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
229 struct pci_dev *pdev = to_pci_dev(dev);
231 return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
235 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
238 return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
242 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
244 struct pci_dev *pdev = to_pci_dev(dev);
246 if (!pdev->subordinate)
249 return sprintf (buf, "%u\n",
250 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
254 msi_bus_store(struct device *dev, struct device_attribute *attr,
255 const char *buf, size_t count)
257 struct pci_dev *pdev = to_pci_dev(dev);
260 if (strict_strtoul(buf, 0, &val) < 0)
263 /* bad things may happen if the no_msi flag is changed
264 * while some drivers are loaded */
265 if (!capable(CAP_SYS_ADMIN))
268 /* Maybe pci devices without subordinate busses shouldn't even have this
269 * attribute in the first place? */
270 if (!pdev->subordinate)
273 /* Is the flag going to change, or keep the value it already had? */
274 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
276 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
278 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
279 " bad things could happen\n", val ? "" : " not");
285 #ifdef CONFIG_HOTPLUG
286 static DEFINE_MUTEX(pci_remove_rescan_mutex);
287 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
291 struct pci_bus *b = NULL;
293 if (strict_strtoul(buf, 0, &val) < 0)
297 mutex_lock(&pci_remove_rescan_mutex);
298 while ((b = pci_find_next_bus(b)) != NULL)
300 mutex_unlock(&pci_remove_rescan_mutex);
305 struct bus_attribute pci_bus_attrs[] = {
306 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
311 dev_rescan_store(struct device *dev, struct device_attribute *attr,
312 const char *buf, size_t count)
315 struct pci_dev *pdev = to_pci_dev(dev);
317 if (strict_strtoul(buf, 0, &val) < 0)
321 mutex_lock(&pci_remove_rescan_mutex);
322 pci_rescan_bus(pdev->bus);
323 mutex_unlock(&pci_remove_rescan_mutex);
328 static void remove_callback(struct device *dev)
330 struct pci_dev *pdev = to_pci_dev(dev);
332 mutex_lock(&pci_remove_rescan_mutex);
333 pci_stop_and_remove_bus_device(pdev);
334 mutex_unlock(&pci_remove_rescan_mutex);
338 remove_store(struct device *dev, struct device_attribute *dummy,
339 const char *buf, size_t count)
344 if (strict_strtoul(buf, 0, &val) < 0)
347 /* An attribute cannot be unregistered by one of its own methods,
348 * so we have to use this roundabout approach.
351 ret = device_schedule_callback(dev, remove_callback);
358 dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
359 const char *buf, size_t count)
362 struct pci_bus *bus = to_pci_bus(dev);
364 if (strict_strtoul(buf, 0, &val) < 0)
368 mutex_lock(&pci_remove_rescan_mutex);
369 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
370 pci_rescan_bus_bridge_resize(bus->self);
373 mutex_unlock(&pci_remove_rescan_mutex);
380 struct device_attribute pci_dev_attrs[] = {
384 __ATTR_RO(subsystem_vendor),
385 __ATTR_RO(subsystem_device),
388 __ATTR_RO(local_cpus),
389 __ATTR_RO(local_cpulist),
392 __ATTR_RO(numa_node),
394 __ATTR_RO(dma_mask_bits),
395 __ATTR_RO(consistent_dma_mask_bits),
396 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
397 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
398 broken_parity_status_show,broken_parity_status_store),
399 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
400 #ifdef CONFIG_HOTPLUG
401 __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
402 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
407 struct device_attribute pcibus_dev_attrs[] = {
408 #ifdef CONFIG_HOTPLUG
409 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store),
411 __ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL),
412 __ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL),
417 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
419 struct pci_dev *pdev = to_pci_dev(dev);
421 return sprintf(buf, "%u\n",
422 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
423 IORESOURCE_ROM_SHADOW));
425 struct device_attribute vga_attr = __ATTR_RO(boot_vga);
428 pci_read_config(struct file *filp, struct kobject *kobj,
429 struct bin_attribute *bin_attr,
430 char *buf, loff_t off, size_t count)
432 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
433 unsigned int size = 64;
434 loff_t init_off = off;
435 u8 *data = (u8*) buf;
437 /* Several chips lock up trying to read undefined config space */
438 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
439 size = dev->cfg_size;
440 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
446 if (off + count > size) {
453 if ((off & 1) && size) {
455 pci_user_read_config_byte(dev, off, &val);
456 data[off - init_off] = val;
461 if ((off & 3) && size > 2) {
463 pci_user_read_config_word(dev, off, &val);
464 data[off - init_off] = val & 0xff;
465 data[off - init_off + 1] = (val >> 8) & 0xff;
472 pci_user_read_config_dword(dev, off, &val);
473 data[off - init_off] = val & 0xff;
474 data[off - init_off + 1] = (val >> 8) & 0xff;
475 data[off - init_off + 2] = (val >> 16) & 0xff;
476 data[off - init_off + 3] = (val >> 24) & 0xff;
483 pci_user_read_config_word(dev, off, &val);
484 data[off - init_off] = val & 0xff;
485 data[off - init_off + 1] = (val >> 8) & 0xff;
492 pci_user_read_config_byte(dev, off, &val);
493 data[off - init_off] = val;
502 pci_write_config(struct file* filp, struct kobject *kobj,
503 struct bin_attribute *bin_attr,
504 char *buf, loff_t off, size_t count)
506 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
507 unsigned int size = count;
508 loff_t init_off = off;
509 u8 *data = (u8*) buf;
511 if (off > dev->cfg_size)
513 if (off + count > dev->cfg_size) {
514 size = dev->cfg_size - off;
518 if ((off & 1) && size) {
519 pci_user_write_config_byte(dev, off, data[off - init_off]);
524 if ((off & 3) && size > 2) {
525 u16 val = data[off - init_off];
526 val |= (u16) data[off - init_off + 1] << 8;
527 pci_user_write_config_word(dev, off, val);
533 u32 val = data[off - init_off];
534 val |= (u32) data[off - init_off + 1] << 8;
535 val |= (u32) data[off - init_off + 2] << 16;
536 val |= (u32) data[off - init_off + 3] << 24;
537 pci_user_write_config_dword(dev, off, val);
543 u16 val = data[off - init_off];
544 val |= (u16) data[off - init_off + 1] << 8;
545 pci_user_write_config_word(dev, off, val);
551 pci_user_write_config_byte(dev, off, data[off - init_off]);
560 read_vpd_attr(struct file *filp, struct kobject *kobj,
561 struct bin_attribute *bin_attr,
562 char *buf, loff_t off, size_t count)
564 struct pci_dev *dev =
565 to_pci_dev(container_of(kobj, struct device, kobj));
567 if (off > bin_attr->size)
569 else if (count > bin_attr->size - off)
570 count = bin_attr->size - off;
572 return pci_read_vpd(dev, off, count, buf);
576 write_vpd_attr(struct file *filp, struct kobject *kobj,
577 struct bin_attribute *bin_attr,
578 char *buf, loff_t off, size_t count)
580 struct pci_dev *dev =
581 to_pci_dev(container_of(kobj, struct device, kobj));
583 if (off > bin_attr->size)
585 else if (count > bin_attr->size - off)
586 count = bin_attr->size - off;
588 return pci_write_vpd(dev, off, count, buf);
591 #ifdef HAVE_PCI_LEGACY
593 * pci_read_legacy_io - read byte(s) from legacy I/O port space
594 * @filp: open sysfs file
595 * @kobj: kobject corresponding to file to read from
596 * @bin_attr: struct bin_attribute for this file
597 * @buf: buffer to store results
598 * @off: offset into legacy I/O port space
599 * @count: number of bytes to read
601 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
602 * callback routine (pci_legacy_read).
605 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
606 struct bin_attribute *bin_attr,
607 char *buf, loff_t off, size_t count)
609 struct pci_bus *bus = to_pci_bus(container_of(kobj,
613 /* Only support 1, 2 or 4 byte accesses */
614 if (count != 1 && count != 2 && count != 4)
617 return pci_legacy_read(bus, off, (u32 *)buf, count);
621 * pci_write_legacy_io - write byte(s) to legacy I/O port space
622 * @filp: open sysfs file
623 * @kobj: kobject corresponding to file to read from
624 * @bin_attr: struct bin_attribute for this file
625 * @buf: buffer containing value to be written
626 * @off: offset into legacy I/O port space
627 * @count: number of bytes to write
629 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
630 * callback routine (pci_legacy_write).
633 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
634 struct bin_attribute *bin_attr,
635 char *buf, loff_t off, size_t count)
637 struct pci_bus *bus = to_pci_bus(container_of(kobj,
640 /* Only support 1, 2 or 4 byte accesses */
641 if (count != 1 && count != 2 && count != 4)
644 return pci_legacy_write(bus, off, *(u32 *)buf, count);
648 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
649 * @filp: open sysfs file
650 * @kobj: kobject corresponding to device to be mapped
651 * @attr: struct bin_attribute for this file
652 * @vma: struct vm_area_struct passed to mmap
654 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
655 * legacy memory space (first meg of bus space) into application virtual
659 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
660 struct bin_attribute *attr,
661 struct vm_area_struct *vma)
663 struct pci_bus *bus = to_pci_bus(container_of(kobj,
667 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
671 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
672 * @filp: open sysfs file
673 * @kobj: kobject corresponding to device to be mapped
674 * @attr: struct bin_attribute for this file
675 * @vma: struct vm_area_struct passed to mmap
677 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
678 * legacy IO space (first meg of bus space) into application virtual
679 * memory space. Returns -ENOSYS if the operation isn't supported
682 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
683 struct bin_attribute *attr,
684 struct vm_area_struct *vma)
686 struct pci_bus *bus = to_pci_bus(container_of(kobj,
690 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
694 * pci_adjust_legacy_attr - adjustment of legacy file attributes
695 * @b: bus to create files under
696 * @mmap_type: I/O port or memory
698 * Stub implementation. Can be overridden by arch if necessary.
701 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
707 * pci_create_legacy_files - create legacy I/O port and memory files
708 * @b: bus to create files under
710 * Some platforms allow access to legacy I/O port and ISA memory space on
711 * a per-bus basis. This routine creates the files and ties them into
712 * their associated read, write and mmap files from pci-sysfs.c
714 * On error unwind, but don't propagate the error to the caller
715 * as it is ok to set up the PCI bus without these files.
717 void pci_create_legacy_files(struct pci_bus *b)
721 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
726 sysfs_bin_attr_init(b->legacy_io);
727 b->legacy_io->attr.name = "legacy_io";
728 b->legacy_io->size = 0xffff;
729 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
730 b->legacy_io->read = pci_read_legacy_io;
731 b->legacy_io->write = pci_write_legacy_io;
732 b->legacy_io->mmap = pci_mmap_legacy_io;
733 pci_adjust_legacy_attr(b, pci_mmap_io);
734 error = device_create_bin_file(&b->dev, b->legacy_io);
738 /* Allocated above after the legacy_io struct */
739 b->legacy_mem = b->legacy_io + 1;
740 sysfs_bin_attr_init(b->legacy_mem);
741 b->legacy_mem->attr.name = "legacy_mem";
742 b->legacy_mem->size = 1024*1024;
743 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
744 b->legacy_mem->mmap = pci_mmap_legacy_mem;
745 pci_adjust_legacy_attr(b, pci_mmap_mem);
746 error = device_create_bin_file(&b->dev, b->legacy_mem);
753 device_remove_bin_file(&b->dev, b->legacy_io);
758 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
759 "and ISA memory resources to sysfs\n");
763 void pci_remove_legacy_files(struct pci_bus *b)
766 device_remove_bin_file(&b->dev, b->legacy_io);
767 device_remove_bin_file(&b->dev, b->legacy_mem);
768 kfree(b->legacy_io); /* both are allocated here */
771 #endif /* HAVE_PCI_LEGACY */
775 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
776 enum pci_mmap_api mmap_api)
778 unsigned long nr, start, size, pci_start;
780 if (pci_resource_len(pdev, resno) == 0)
782 nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
783 start = vma->vm_pgoff;
784 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
785 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
786 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
787 if (start >= pci_start && start < pci_start + size &&
788 start + nr <= pci_start + size)
794 * pci_mmap_resource - map a PCI resource into user memory space
795 * @kobj: kobject for mapping
796 * @attr: struct bin_attribute for the file being mapped
797 * @vma: struct vm_area_struct passed into the mmap
798 * @write_combine: 1 for write_combine mapping
800 * Use the regular PCI mapping routines to map a PCI resource into userspace.
803 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
804 struct vm_area_struct *vma, int write_combine)
806 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
807 struct device, kobj));
808 struct resource *res = attr->private;
809 enum pci_mmap_state mmap_type;
810 resource_size_t start, end;
813 for (i = 0; i < PCI_ROM_RESOURCE; i++)
814 if (res == &pdev->resource[i])
816 if (i >= PCI_ROM_RESOURCE)
819 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
820 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
821 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
822 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
824 (u64)pci_resource_start(pdev, i),
825 (u64)pci_resource_len(pdev, i));
829 /* pci_mmap_page_range() expects the same kind of entry as coming
830 * from /proc/bus/pci/ which is a "user visible" value. If this is
831 * different from the resource itself, arch will do necessary fixup.
833 pci_resource_to_user(pdev, i, res, &start, &end);
834 vma->vm_pgoff += start >> PAGE_SHIFT;
835 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
837 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
840 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
844 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
845 struct bin_attribute *attr,
846 struct vm_area_struct *vma)
848 return pci_mmap_resource(kobj, attr, vma, 0);
852 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
853 struct bin_attribute *attr,
854 struct vm_area_struct *vma)
856 return pci_mmap_resource(kobj, attr, vma, 1);
860 pci_resource_io(struct file *filp, struct kobject *kobj,
861 struct bin_attribute *attr, char *buf,
862 loff_t off, size_t count, bool write)
864 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
865 struct device, kobj));
866 struct resource *res = attr->private;
867 unsigned long port = off;
870 for (i = 0; i < PCI_ROM_RESOURCE; i++)
871 if (res == &pdev->resource[i])
873 if (i >= PCI_ROM_RESOURCE)
876 port += pci_resource_start(pdev, i);
878 if (port > pci_resource_end(pdev, i))
881 if (port + count - 1 > pci_resource_end(pdev, i))
887 outb(*(u8 *)buf, port);
889 *(u8 *)buf = inb(port);
893 outw(*(u16 *)buf, port);
895 *(u16 *)buf = inw(port);
899 outl(*(u32 *)buf, port);
901 *(u32 *)buf = inl(port);
908 pci_read_resource_io(struct file *filp, struct kobject *kobj,
909 struct bin_attribute *attr, char *buf,
910 loff_t off, size_t count)
912 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
916 pci_write_resource_io(struct file *filp, struct kobject *kobj,
917 struct bin_attribute *attr, char *buf,
918 loff_t off, size_t count)
920 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
924 * pci_remove_resource_files - cleanup resource files
925 * @pdev: dev to cleanup
927 * If we created resource files for @pdev, remove them from sysfs and
928 * free their resources.
931 pci_remove_resource_files(struct pci_dev *pdev)
935 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
936 struct bin_attribute *res_attr;
938 res_attr = pdev->res_attr[i];
940 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
944 res_attr = pdev->res_attr_wc[i];
946 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
952 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
954 /* allocate attribute structure, piggyback attribute name */
955 int name_len = write_combine ? 13 : 10;
956 struct bin_attribute *res_attr;
959 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
961 char *res_attr_name = (char *)(res_attr + 1);
963 sysfs_bin_attr_init(res_attr);
965 pdev->res_attr_wc[num] = res_attr;
966 sprintf(res_attr_name, "resource%d_wc", num);
967 res_attr->mmap = pci_mmap_resource_wc;
969 pdev->res_attr[num] = res_attr;
970 sprintf(res_attr_name, "resource%d", num);
971 res_attr->mmap = pci_mmap_resource_uc;
973 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
974 res_attr->read = pci_read_resource_io;
975 res_attr->write = pci_write_resource_io;
977 res_attr->attr.name = res_attr_name;
978 res_attr->attr.mode = S_IRUSR | S_IWUSR;
979 res_attr->size = pci_resource_len(pdev, num);
980 res_attr->private = &pdev->resource[num];
981 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
989 * pci_create_resource_files - create resource files in sysfs for @dev
990 * @pdev: dev in question
992 * Walk the resources in @pdev creating files for each resource available.
994 static int pci_create_resource_files(struct pci_dev *pdev)
999 /* Expose the PCI resources from this device as files */
1000 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1002 /* skip empty resources */
1003 if (!pci_resource_len(pdev, i))
1006 retval = pci_create_attr(pdev, i, 0);
1007 /* for prefetchable resources, create a WC mappable file */
1008 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1009 retval = pci_create_attr(pdev, i, 1);
1012 pci_remove_resource_files(pdev);
1018 #else /* !HAVE_PCI_MMAP */
1019 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1020 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1021 #endif /* HAVE_PCI_MMAP */
1024 * pci_write_rom - used to enable access to the PCI ROM display
1026 * @kobj: kernel object handle
1027 * @bin_attr: struct bin_attribute for this file
1030 * @count: number of byte in input
1032 * writing anything except 0 enables it
1035 pci_write_rom(struct file *filp, struct kobject *kobj,
1036 struct bin_attribute *bin_attr,
1037 char *buf, loff_t off, size_t count)
1039 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1041 if ((off == 0) && (*buf == '0') && (count == 2))
1042 pdev->rom_attr_enabled = 0;
1044 pdev->rom_attr_enabled = 1;
1050 * pci_read_rom - read a PCI ROM
1052 * @kobj: kernel object handle
1053 * @bin_attr: struct bin_attribute for this file
1054 * @buf: where to put the data we read from the ROM
1056 * @count: number of bytes to read
1058 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1059 * device corresponding to @kobj.
1062 pci_read_rom(struct file *filp, struct kobject *kobj,
1063 struct bin_attribute *bin_attr,
1064 char *buf, loff_t off, size_t count)
1066 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1070 if (!pdev->rom_attr_enabled)
1073 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1080 if (off + count > size)
1083 memcpy_fromio(buf, rom + off, count);
1085 pci_unmap_rom(pdev, rom);
1090 static struct bin_attribute pci_config_attr = {
1093 .mode = S_IRUGO | S_IWUSR,
1095 .size = PCI_CFG_SPACE_SIZE,
1096 .read = pci_read_config,
1097 .write = pci_write_config,
1100 static struct bin_attribute pcie_config_attr = {
1103 .mode = S_IRUGO | S_IWUSR,
1105 .size = PCI_CFG_SPACE_EXP_SIZE,
1106 .read = pci_read_config,
1107 .write = pci_write_config,
1110 int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
1115 static ssize_t reset_store(struct device *dev,
1116 struct device_attribute *attr, const char *buf,
1119 struct pci_dev *pdev = to_pci_dev(dev);
1121 ssize_t result = strict_strtoul(buf, 0, &val);
1129 result = pci_reset_function(pdev);
1136 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1138 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1141 struct bin_attribute *attr;
1143 /* If the device has VPD, try to expose it in sysfs. */
1145 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1149 sysfs_bin_attr_init(attr);
1150 attr->size = dev->vpd->len;
1151 attr->attr.name = "vpd";
1152 attr->attr.mode = S_IRUSR | S_IWUSR;
1153 attr->read = read_vpd_attr;
1154 attr->write = write_vpd_attr;
1155 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1160 dev->vpd->attr = attr;
1163 /* Active State Power Management */
1164 pcie_aspm_create_sysfs_dev_files(dev);
1166 if (!pci_probe_reset_function(dev)) {
1167 retval = device_create_file(&dev->dev, &reset_attr);
1175 pcie_aspm_remove_sysfs_dev_files(dev);
1176 if (dev->vpd && dev->vpd->attr) {
1177 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1178 kfree(dev->vpd->attr);
1184 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1188 struct bin_attribute *attr;
1190 if (!sysfs_initialized)
1193 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1194 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1196 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1200 retval = pci_create_resource_files(pdev);
1202 goto err_config_file;
1204 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1205 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1206 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1209 /* If the device has a ROM, try to expose it in sysfs. */
1211 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1214 goto err_resource_files;
1216 sysfs_bin_attr_init(attr);
1217 attr->size = rom_size;
1218 attr->attr.name = "rom";
1219 attr->attr.mode = S_IRUSR | S_IWUSR;
1220 attr->read = pci_read_rom;
1221 attr->write = pci_write_rom;
1222 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1225 goto err_resource_files;
1227 pdev->rom_attr = attr;
1230 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1231 retval = device_create_file(&pdev->dev, &vga_attr);
1236 /* add platform-specific attributes */
1237 retval = pcibios_add_platform_entries(pdev);
1241 /* add sysfs entries for various capabilities */
1242 retval = pci_create_capabilities_sysfs(pdev);
1246 pci_create_firmware_label_files(pdev);
1251 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1252 device_remove_file(&pdev->dev, &vga_attr);
1255 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1256 kfree(pdev->rom_attr);
1257 pdev->rom_attr = NULL;
1260 pci_remove_resource_files(pdev);
1262 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1263 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1265 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1270 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1272 if (dev->vpd && dev->vpd->attr) {
1273 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1274 kfree(dev->vpd->attr);
1277 pcie_aspm_remove_sysfs_dev_files(dev);
1278 if (dev->reset_fn) {
1279 device_remove_file(&dev->dev, &reset_attr);
1285 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1286 * @pdev: device whose entries we should free
1288 * Cleanup when @pdev is removed from sysfs.
1290 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1294 if (!sysfs_initialized)
1297 pci_remove_capabilities_sysfs(pdev);
1299 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1300 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1302 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1304 pci_remove_resource_files(pdev);
1306 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1307 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1308 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1311 if (rom_size && pdev->rom_attr) {
1312 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1313 kfree(pdev->rom_attr);
1316 pci_remove_firmware_label_files(pdev);
1320 static int __init pci_sysfs_init(void)
1322 struct pci_dev *pdev = NULL;
1325 sysfs_initialized = 1;
1326 for_each_pci_dev(pdev) {
1327 retval = pci_create_sysfs_dev_files(pdev);
1337 late_initcall(pci_sysfs_init);