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_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);
370 mutex_unlock(&pci_remove_rescan_mutex);
377 struct device_attribute pci_dev_attrs[] = {
381 __ATTR_RO(subsystem_vendor),
382 __ATTR_RO(subsystem_device),
385 __ATTR_RO(local_cpus),
386 __ATTR_RO(local_cpulist),
389 __ATTR_RO(numa_node),
391 __ATTR_RO(dma_mask_bits),
392 __ATTR_RO(consistent_dma_mask_bits),
393 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
394 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
395 broken_parity_status_show,broken_parity_status_store),
396 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
397 #ifdef CONFIG_HOTPLUG
398 __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
399 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
404 struct device_attribute pcibus_dev_attrs[] = {
405 #ifdef CONFIG_HOTPLUG
406 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store),
408 __ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL),
409 __ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL),
414 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
416 struct pci_dev *pdev = to_pci_dev(dev);
418 return sprintf(buf, "%u\n",
419 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
420 IORESOURCE_ROM_SHADOW));
422 struct device_attribute vga_attr = __ATTR_RO(boot_vga);
425 pci_read_config(struct file *filp, struct kobject *kobj,
426 struct bin_attribute *bin_attr,
427 char *buf, loff_t off, size_t count)
429 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
430 unsigned int size = 64;
431 loff_t init_off = off;
432 u8 *data = (u8*) buf;
434 /* Several chips lock up trying to read undefined config space */
435 if (security_capable(&init_user_ns, filp->f_cred, CAP_SYS_ADMIN) == 0) {
436 size = dev->cfg_size;
437 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
443 if (off + count > size) {
450 if ((off & 1) && size) {
452 pci_user_read_config_byte(dev, off, &val);
453 data[off - init_off] = val;
458 if ((off & 3) && size > 2) {
460 pci_user_read_config_word(dev, off, &val);
461 data[off - init_off] = val & 0xff;
462 data[off - init_off + 1] = (val >> 8) & 0xff;
469 pci_user_read_config_dword(dev, off, &val);
470 data[off - init_off] = val & 0xff;
471 data[off - init_off + 1] = (val >> 8) & 0xff;
472 data[off - init_off + 2] = (val >> 16) & 0xff;
473 data[off - init_off + 3] = (val >> 24) & 0xff;
480 pci_user_read_config_word(dev, off, &val);
481 data[off - init_off] = val & 0xff;
482 data[off - init_off + 1] = (val >> 8) & 0xff;
489 pci_user_read_config_byte(dev, off, &val);
490 data[off - init_off] = val;
499 pci_write_config(struct file* filp, struct kobject *kobj,
500 struct bin_attribute *bin_attr,
501 char *buf, loff_t off, size_t count)
503 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
504 unsigned int size = count;
505 loff_t init_off = off;
506 u8 *data = (u8*) buf;
508 if (off > dev->cfg_size)
510 if (off + count > dev->cfg_size) {
511 size = dev->cfg_size - off;
515 if ((off & 1) && size) {
516 pci_user_write_config_byte(dev, off, data[off - init_off]);
521 if ((off & 3) && size > 2) {
522 u16 val = data[off - init_off];
523 val |= (u16) data[off - init_off + 1] << 8;
524 pci_user_write_config_word(dev, off, val);
530 u32 val = data[off - init_off];
531 val |= (u32) data[off - init_off + 1] << 8;
532 val |= (u32) data[off - init_off + 2] << 16;
533 val |= (u32) data[off - init_off + 3] << 24;
534 pci_user_write_config_dword(dev, off, val);
540 u16 val = data[off - init_off];
541 val |= (u16) data[off - init_off + 1] << 8;
542 pci_user_write_config_word(dev, off, val);
548 pci_user_write_config_byte(dev, off, data[off - init_off]);
557 read_vpd_attr(struct file *filp, struct kobject *kobj,
558 struct bin_attribute *bin_attr,
559 char *buf, loff_t off, size_t count)
561 struct pci_dev *dev =
562 to_pci_dev(container_of(kobj, struct device, kobj));
564 if (off > bin_attr->size)
566 else if (count > bin_attr->size - off)
567 count = bin_attr->size - off;
569 return pci_read_vpd(dev, off, count, buf);
573 write_vpd_attr(struct file *filp, struct kobject *kobj,
574 struct bin_attribute *bin_attr,
575 char *buf, loff_t off, size_t count)
577 struct pci_dev *dev =
578 to_pci_dev(container_of(kobj, struct device, kobj));
580 if (off > bin_attr->size)
582 else if (count > bin_attr->size - off)
583 count = bin_attr->size - off;
585 return pci_write_vpd(dev, off, count, buf);
588 #ifdef HAVE_PCI_LEGACY
590 * pci_read_legacy_io - read byte(s) from legacy I/O port space
591 * @filp: open sysfs file
592 * @kobj: kobject corresponding to file to read from
593 * @bin_attr: struct bin_attribute for this file
594 * @buf: buffer to store results
595 * @off: offset into legacy I/O port space
596 * @count: number of bytes to read
598 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
599 * callback routine (pci_legacy_read).
602 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
603 struct bin_attribute *bin_attr,
604 char *buf, loff_t off, size_t count)
606 struct pci_bus *bus = to_pci_bus(container_of(kobj,
610 /* Only support 1, 2 or 4 byte accesses */
611 if (count != 1 && count != 2 && count != 4)
614 return pci_legacy_read(bus, off, (u32 *)buf, count);
618 * pci_write_legacy_io - write byte(s) to legacy I/O port space
619 * @filp: open sysfs file
620 * @kobj: kobject corresponding to file to read from
621 * @bin_attr: struct bin_attribute for this file
622 * @buf: buffer containing value to be written
623 * @off: offset into legacy I/O port space
624 * @count: number of bytes to write
626 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
627 * callback routine (pci_legacy_write).
630 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
631 struct bin_attribute *bin_attr,
632 char *buf, loff_t off, size_t count)
634 struct pci_bus *bus = to_pci_bus(container_of(kobj,
637 /* Only support 1, 2 or 4 byte accesses */
638 if (count != 1 && count != 2 && count != 4)
641 return pci_legacy_write(bus, off, *(u32 *)buf, count);
645 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
646 * @filp: open sysfs file
647 * @kobj: kobject corresponding to device to be mapped
648 * @attr: struct bin_attribute for this file
649 * @vma: struct vm_area_struct passed to mmap
651 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
652 * legacy memory space (first meg of bus space) into application virtual
656 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
657 struct bin_attribute *attr,
658 struct vm_area_struct *vma)
660 struct pci_bus *bus = to_pci_bus(container_of(kobj,
664 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
668 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
669 * @filp: open sysfs file
670 * @kobj: kobject corresponding to device to be mapped
671 * @attr: struct bin_attribute for this file
672 * @vma: struct vm_area_struct passed to mmap
674 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
675 * legacy IO space (first meg of bus space) into application virtual
676 * memory space. Returns -ENOSYS if the operation isn't supported
679 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
680 struct bin_attribute *attr,
681 struct vm_area_struct *vma)
683 struct pci_bus *bus = to_pci_bus(container_of(kobj,
687 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
691 * pci_adjust_legacy_attr - adjustment of legacy file attributes
692 * @b: bus to create files under
693 * @mmap_type: I/O port or memory
695 * Stub implementation. Can be overridden by arch if necessary.
698 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
704 * pci_create_legacy_files - create legacy I/O port and memory files
705 * @b: bus to create files under
707 * Some platforms allow access to legacy I/O port and ISA memory space on
708 * a per-bus basis. This routine creates the files and ties them into
709 * their associated read, write and mmap files from pci-sysfs.c
711 * On error unwind, but don't propagate the error to the caller
712 * as it is ok to set up the PCI bus without these files.
714 void pci_create_legacy_files(struct pci_bus *b)
718 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
723 sysfs_bin_attr_init(b->legacy_io);
724 b->legacy_io->attr.name = "legacy_io";
725 b->legacy_io->size = 0xffff;
726 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
727 b->legacy_io->read = pci_read_legacy_io;
728 b->legacy_io->write = pci_write_legacy_io;
729 b->legacy_io->mmap = pci_mmap_legacy_io;
730 pci_adjust_legacy_attr(b, pci_mmap_io);
731 error = device_create_bin_file(&b->dev, b->legacy_io);
735 /* Allocated above after the legacy_io struct */
736 b->legacy_mem = b->legacy_io + 1;
737 sysfs_bin_attr_init(b->legacy_mem);
738 b->legacy_mem->attr.name = "legacy_mem";
739 b->legacy_mem->size = 1024*1024;
740 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
741 b->legacy_mem->mmap = pci_mmap_legacy_mem;
742 pci_adjust_legacy_attr(b, pci_mmap_mem);
743 error = device_create_bin_file(&b->dev, b->legacy_mem);
750 device_remove_bin_file(&b->dev, b->legacy_io);
755 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
756 "and ISA memory resources to sysfs\n");
760 void pci_remove_legacy_files(struct pci_bus *b)
763 device_remove_bin_file(&b->dev, b->legacy_io);
764 device_remove_bin_file(&b->dev, b->legacy_mem);
765 kfree(b->legacy_io); /* both are allocated here */
768 #endif /* HAVE_PCI_LEGACY */
772 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
773 enum pci_mmap_api mmap_api)
775 unsigned long nr, start, size, pci_start;
777 if (pci_resource_len(pdev, resno) == 0)
779 nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
780 start = vma->vm_pgoff;
781 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
782 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
783 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
784 if (start >= pci_start && start < pci_start + size &&
785 start + nr <= pci_start + size)
791 * pci_mmap_resource - map a PCI resource into user memory space
792 * @kobj: kobject for mapping
793 * @attr: struct bin_attribute for the file being mapped
794 * @vma: struct vm_area_struct passed into the mmap
795 * @write_combine: 1 for write_combine mapping
797 * Use the regular PCI mapping routines to map a PCI resource into userspace.
800 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
801 struct vm_area_struct *vma, int write_combine)
803 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
804 struct device, kobj));
805 struct resource *res = attr->private;
806 enum pci_mmap_state mmap_type;
807 resource_size_t start, end;
810 for (i = 0; i < PCI_ROM_RESOURCE; i++)
811 if (res == &pdev->resource[i])
813 if (i >= PCI_ROM_RESOURCE)
816 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
817 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
818 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
819 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
821 (u64)pci_resource_start(pdev, i),
822 (u64)pci_resource_len(pdev, i));
826 /* pci_mmap_page_range() expects the same kind of entry as coming
827 * from /proc/bus/pci/ which is a "user visible" value. If this is
828 * different from the resource itself, arch will do necessary fixup.
830 pci_resource_to_user(pdev, i, res, &start, &end);
831 vma->vm_pgoff += start >> PAGE_SHIFT;
832 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
834 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
837 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
841 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
842 struct bin_attribute *attr,
843 struct vm_area_struct *vma)
845 return pci_mmap_resource(kobj, attr, vma, 0);
849 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
850 struct bin_attribute *attr,
851 struct vm_area_struct *vma)
853 return pci_mmap_resource(kobj, attr, vma, 1);
857 pci_resource_io(struct file *filp, struct kobject *kobj,
858 struct bin_attribute *attr, char *buf,
859 loff_t off, size_t count, bool write)
861 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
862 struct device, kobj));
863 struct resource *res = attr->private;
864 unsigned long port = off;
867 for (i = 0; i < PCI_ROM_RESOURCE; i++)
868 if (res == &pdev->resource[i])
870 if (i >= PCI_ROM_RESOURCE)
873 port += pci_resource_start(pdev, i);
875 if (port > pci_resource_end(pdev, i))
878 if (port + count - 1 > pci_resource_end(pdev, i))
884 outb(*(u8 *)buf, port);
886 *(u8 *)buf = inb(port);
890 outw(*(u16 *)buf, port);
892 *(u16 *)buf = inw(port);
896 outl(*(u32 *)buf, port);
898 *(u32 *)buf = inl(port);
905 pci_read_resource_io(struct file *filp, struct kobject *kobj,
906 struct bin_attribute *attr, char *buf,
907 loff_t off, size_t count)
909 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
913 pci_write_resource_io(struct file *filp, struct kobject *kobj,
914 struct bin_attribute *attr, char *buf,
915 loff_t off, size_t count)
917 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
921 * pci_remove_resource_files - cleanup resource files
922 * @pdev: dev to cleanup
924 * If we created resource files for @pdev, remove them from sysfs and
925 * free their resources.
928 pci_remove_resource_files(struct pci_dev *pdev)
932 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
933 struct bin_attribute *res_attr;
935 res_attr = pdev->res_attr[i];
937 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
941 res_attr = pdev->res_attr_wc[i];
943 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
949 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
951 /* allocate attribute structure, piggyback attribute name */
952 int name_len = write_combine ? 13 : 10;
953 struct bin_attribute *res_attr;
956 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
958 char *res_attr_name = (char *)(res_attr + 1);
960 sysfs_bin_attr_init(res_attr);
962 pdev->res_attr_wc[num] = res_attr;
963 sprintf(res_attr_name, "resource%d_wc", num);
964 res_attr->mmap = pci_mmap_resource_wc;
966 pdev->res_attr[num] = res_attr;
967 sprintf(res_attr_name, "resource%d", num);
968 res_attr->mmap = pci_mmap_resource_uc;
970 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
971 res_attr->read = pci_read_resource_io;
972 res_attr->write = pci_write_resource_io;
974 res_attr->attr.name = res_attr_name;
975 res_attr->attr.mode = S_IRUSR | S_IWUSR;
976 res_attr->size = pci_resource_len(pdev, num);
977 res_attr->private = &pdev->resource[num];
978 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
986 * pci_create_resource_files - create resource files in sysfs for @dev
987 * @pdev: dev in question
989 * Walk the resources in @pdev creating files for each resource available.
991 static int pci_create_resource_files(struct pci_dev *pdev)
996 /* Expose the PCI resources from this device as files */
997 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
999 /* skip empty resources */
1000 if (!pci_resource_len(pdev, i))
1003 retval = pci_create_attr(pdev, i, 0);
1004 /* for prefetchable resources, create a WC mappable file */
1005 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1006 retval = pci_create_attr(pdev, i, 1);
1009 pci_remove_resource_files(pdev);
1015 #else /* !HAVE_PCI_MMAP */
1016 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1017 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1018 #endif /* HAVE_PCI_MMAP */
1021 * pci_write_rom - used to enable access to the PCI ROM display
1023 * @kobj: kernel object handle
1024 * @bin_attr: struct bin_attribute for this file
1027 * @count: number of byte in input
1029 * writing anything except 0 enables it
1032 pci_write_rom(struct file *filp, struct kobject *kobj,
1033 struct bin_attribute *bin_attr,
1034 char *buf, loff_t off, size_t count)
1036 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1038 if ((off == 0) && (*buf == '0') && (count == 2))
1039 pdev->rom_attr_enabled = 0;
1041 pdev->rom_attr_enabled = 1;
1047 * pci_read_rom - read a PCI ROM
1049 * @kobj: kernel object handle
1050 * @bin_attr: struct bin_attribute for this file
1051 * @buf: where to put the data we read from the ROM
1053 * @count: number of bytes to read
1055 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1056 * device corresponding to @kobj.
1059 pci_read_rom(struct file *filp, struct kobject *kobj,
1060 struct bin_attribute *bin_attr,
1061 char *buf, loff_t off, size_t count)
1063 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1067 if (!pdev->rom_attr_enabled)
1070 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1077 if (off + count > size)
1080 memcpy_fromio(buf, rom + off, count);
1082 pci_unmap_rom(pdev, rom);
1087 static struct bin_attribute pci_config_attr = {
1090 .mode = S_IRUGO | S_IWUSR,
1092 .size = PCI_CFG_SPACE_SIZE,
1093 .read = pci_read_config,
1094 .write = pci_write_config,
1097 static struct bin_attribute pcie_config_attr = {
1100 .mode = S_IRUGO | S_IWUSR,
1102 .size = PCI_CFG_SPACE_EXP_SIZE,
1103 .read = pci_read_config,
1104 .write = pci_write_config,
1107 int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
1112 static ssize_t reset_store(struct device *dev,
1113 struct device_attribute *attr, const char *buf,
1116 struct pci_dev *pdev = to_pci_dev(dev);
1118 ssize_t result = strict_strtoul(buf, 0, &val);
1126 result = pci_reset_function(pdev);
1133 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1135 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1138 struct bin_attribute *attr;
1140 /* If the device has VPD, try to expose it in sysfs. */
1142 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1146 sysfs_bin_attr_init(attr);
1147 attr->size = dev->vpd->len;
1148 attr->attr.name = "vpd";
1149 attr->attr.mode = S_IRUSR | S_IWUSR;
1150 attr->read = read_vpd_attr;
1151 attr->write = write_vpd_attr;
1152 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1157 dev->vpd->attr = attr;
1160 /* Active State Power Management */
1161 pcie_aspm_create_sysfs_dev_files(dev);
1163 if (!pci_probe_reset_function(dev)) {
1164 retval = device_create_file(&dev->dev, &reset_attr);
1172 pcie_aspm_remove_sysfs_dev_files(dev);
1173 if (dev->vpd && dev->vpd->attr) {
1174 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1175 kfree(dev->vpd->attr);
1181 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1185 struct bin_attribute *attr;
1187 if (!sysfs_initialized)
1190 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1191 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1193 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1197 retval = pci_create_resource_files(pdev);
1199 goto err_config_file;
1201 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1202 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1203 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1206 /* If the device has a ROM, try to expose it in sysfs. */
1208 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1211 goto err_resource_files;
1213 sysfs_bin_attr_init(attr);
1214 attr->size = rom_size;
1215 attr->attr.name = "rom";
1216 attr->attr.mode = S_IRUSR | S_IWUSR;
1217 attr->read = pci_read_rom;
1218 attr->write = pci_write_rom;
1219 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1222 goto err_resource_files;
1224 pdev->rom_attr = attr;
1227 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1228 retval = device_create_file(&pdev->dev, &vga_attr);
1233 /* add platform-specific attributes */
1234 retval = pcibios_add_platform_entries(pdev);
1238 /* add sysfs entries for various capabilities */
1239 retval = pci_create_capabilities_sysfs(pdev);
1243 pci_create_firmware_label_files(pdev);
1248 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1249 device_remove_file(&pdev->dev, &vga_attr);
1252 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1253 kfree(pdev->rom_attr);
1254 pdev->rom_attr = NULL;
1257 pci_remove_resource_files(pdev);
1259 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1260 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1262 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1267 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1269 if (dev->vpd && dev->vpd->attr) {
1270 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1271 kfree(dev->vpd->attr);
1274 pcie_aspm_remove_sysfs_dev_files(dev);
1275 if (dev->reset_fn) {
1276 device_remove_file(&dev->dev, &reset_attr);
1282 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1283 * @pdev: device whose entries we should free
1285 * Cleanup when @pdev is removed from sysfs.
1287 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1291 if (!sysfs_initialized)
1294 pci_remove_capabilities_sysfs(pdev);
1296 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1297 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1299 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1301 pci_remove_resource_files(pdev);
1303 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1304 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1305 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1308 if (rom_size && pdev->rom_attr) {
1309 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1310 kfree(pdev->rom_attr);
1313 pci_remove_firmware_label_files(pdev);
1317 static int __init pci_sysfs_init(void)
1319 struct pci_dev *pdev = NULL;
1322 sysfs_initialized = 1;
1323 for_each_pci_dev(pdev) {
1324 retval = pci_create_sysfs_dev_files(pdev);
1334 late_initcall(pci_sysfs_init);