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 #ifdef CONFIG_HOTPLUG
288 static DEFINE_MUTEX(pci_remove_rescan_mutex);
289 static ssize_t bus_rescan_store(struct bus_type *bus, const char *buf,
293 struct pci_bus *b = NULL;
295 if (strict_strtoul(buf, 0, &val) < 0)
299 mutex_lock(&pci_remove_rescan_mutex);
300 while ((b = pci_find_next_bus(b)) != NULL)
302 mutex_unlock(&pci_remove_rescan_mutex);
307 struct bus_attribute pci_bus_attrs[] = {
308 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, bus_rescan_store),
313 dev_rescan_store(struct device *dev, struct device_attribute *attr,
314 const char *buf, size_t count)
317 struct pci_dev *pdev = to_pci_dev(dev);
319 if (strict_strtoul(buf, 0, &val) < 0)
323 mutex_lock(&pci_remove_rescan_mutex);
324 pci_rescan_bus(pdev->bus);
325 mutex_unlock(&pci_remove_rescan_mutex);
330 static void remove_callback(struct device *dev)
332 struct pci_dev *pdev = to_pci_dev(dev);
334 mutex_lock(&pci_remove_rescan_mutex);
335 pci_stop_and_remove_bus_device(pdev);
336 mutex_unlock(&pci_remove_rescan_mutex);
340 remove_store(struct device *dev, struct device_attribute *dummy,
341 const char *buf, size_t count)
346 if (strict_strtoul(buf, 0, &val) < 0)
349 /* An attribute cannot be unregistered by one of its own methods,
350 * so we have to use this roundabout approach.
353 ret = device_schedule_callback(dev, remove_callback);
360 dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
361 const char *buf, size_t count)
364 struct pci_bus *bus = to_pci_bus(dev);
366 if (strict_strtoul(buf, 0, &val) < 0)
370 mutex_lock(&pci_remove_rescan_mutex);
371 if (!pci_is_root_bus(bus) && list_empty(&bus->devices))
372 pci_rescan_bus_bridge_resize(bus->self);
375 mutex_unlock(&pci_remove_rescan_mutex);
382 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
383 static ssize_t d3cold_allowed_store(struct device *dev,
384 struct device_attribute *attr,
385 const char *buf, size_t count)
387 struct pci_dev *pdev = to_pci_dev(dev);
390 if (strict_strtoul(buf, 0, &val) < 0)
393 pdev->d3cold_allowed = !!val;
394 pm_runtime_resume(dev);
399 static ssize_t d3cold_allowed_show(struct device *dev,
400 struct device_attribute *attr, char *buf)
402 struct pci_dev *pdev = to_pci_dev(dev);
403 return sprintf (buf, "%u\n", pdev->d3cold_allowed);
407 struct device_attribute pci_dev_attrs[] = {
411 __ATTR_RO(subsystem_vendor),
412 __ATTR_RO(subsystem_device),
415 __ATTR_RO(local_cpus),
416 __ATTR_RO(local_cpulist),
419 __ATTR_RO(numa_node),
421 __ATTR_RO(dma_mask_bits),
422 __ATTR_RO(consistent_dma_mask_bits),
423 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
424 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
425 broken_parity_status_show,broken_parity_status_store),
426 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
427 #ifdef CONFIG_HOTPLUG
428 __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
429 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
431 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
432 __ATTR(d3cold_allowed, 0644, d3cold_allowed_show, d3cold_allowed_store),
437 struct device_attribute pcibus_dev_attrs[] = {
438 #ifdef CONFIG_HOTPLUG
439 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store),
441 __ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL),
442 __ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL),
447 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
449 struct pci_dev *pdev = to_pci_dev(dev);
450 struct pci_dev *vga_dev = vga_default_device();
453 return sprintf(buf, "%u\n", (pdev == vga_dev));
455 return sprintf(buf, "%u\n",
456 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
457 IORESOURCE_ROM_SHADOW));
459 struct device_attribute vga_attr = __ATTR_RO(boot_vga);
462 pci_read_config(struct file *filp, struct kobject *kobj,
463 struct bin_attribute *bin_attr,
464 char *buf, loff_t off, size_t count)
466 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
467 unsigned int size = 64;
468 loff_t init_off = off;
469 u8 *data = (u8*) buf;
471 /* Several chips lock up trying to read undefined config space */
472 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
473 size = dev->cfg_size;
474 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
480 if (off + count > size) {
487 if ((off & 1) && size) {
489 pci_user_read_config_byte(dev, off, &val);
490 data[off - init_off] = val;
495 if ((off & 3) && size > 2) {
497 pci_user_read_config_word(dev, off, &val);
498 data[off - init_off] = val & 0xff;
499 data[off - init_off + 1] = (val >> 8) & 0xff;
506 pci_user_read_config_dword(dev, off, &val);
507 data[off - init_off] = val & 0xff;
508 data[off - init_off + 1] = (val >> 8) & 0xff;
509 data[off - init_off + 2] = (val >> 16) & 0xff;
510 data[off - init_off + 3] = (val >> 24) & 0xff;
517 pci_user_read_config_word(dev, off, &val);
518 data[off - init_off] = val & 0xff;
519 data[off - init_off + 1] = (val >> 8) & 0xff;
526 pci_user_read_config_byte(dev, off, &val);
527 data[off - init_off] = val;
536 pci_write_config(struct file* filp, struct kobject *kobj,
537 struct bin_attribute *bin_attr,
538 char *buf, loff_t off, size_t count)
540 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
541 unsigned int size = count;
542 loff_t init_off = off;
543 u8 *data = (u8*) buf;
545 if (off > dev->cfg_size)
547 if (off + count > dev->cfg_size) {
548 size = dev->cfg_size - off;
552 if ((off & 1) && size) {
553 pci_user_write_config_byte(dev, off, data[off - init_off]);
558 if ((off & 3) && size > 2) {
559 u16 val = data[off - init_off];
560 val |= (u16) data[off - init_off + 1] << 8;
561 pci_user_write_config_word(dev, off, val);
567 u32 val = data[off - init_off];
568 val |= (u32) data[off - init_off + 1] << 8;
569 val |= (u32) data[off - init_off + 2] << 16;
570 val |= (u32) data[off - init_off + 3] << 24;
571 pci_user_write_config_dword(dev, off, val);
577 u16 val = data[off - init_off];
578 val |= (u16) data[off - init_off + 1] << 8;
579 pci_user_write_config_word(dev, off, val);
585 pci_user_write_config_byte(dev, off, data[off - init_off]);
594 read_vpd_attr(struct file *filp, struct kobject *kobj,
595 struct bin_attribute *bin_attr,
596 char *buf, loff_t off, size_t count)
598 struct pci_dev *dev =
599 to_pci_dev(container_of(kobj, struct device, kobj));
601 if (off > bin_attr->size)
603 else if (count > bin_attr->size - off)
604 count = bin_attr->size - off;
606 return pci_read_vpd(dev, off, count, buf);
610 write_vpd_attr(struct file *filp, struct kobject *kobj,
611 struct bin_attribute *bin_attr,
612 char *buf, loff_t off, size_t count)
614 struct pci_dev *dev =
615 to_pci_dev(container_of(kobj, struct device, kobj));
617 if (off > bin_attr->size)
619 else if (count > bin_attr->size - off)
620 count = bin_attr->size - off;
622 return pci_write_vpd(dev, off, count, buf);
625 #ifdef HAVE_PCI_LEGACY
627 * pci_read_legacy_io - read byte(s) from legacy I/O port space
628 * @filp: open sysfs file
629 * @kobj: kobject corresponding to file to read from
630 * @bin_attr: struct bin_attribute for this file
631 * @buf: buffer to store results
632 * @off: offset into legacy I/O port space
633 * @count: number of bytes to read
635 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
636 * callback routine (pci_legacy_read).
639 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
640 struct bin_attribute *bin_attr,
641 char *buf, loff_t off, size_t count)
643 struct pci_bus *bus = to_pci_bus(container_of(kobj,
647 /* Only support 1, 2 or 4 byte accesses */
648 if (count != 1 && count != 2 && count != 4)
651 return pci_legacy_read(bus, off, (u32 *)buf, count);
655 * pci_write_legacy_io - write byte(s) to legacy I/O port space
656 * @filp: open sysfs file
657 * @kobj: kobject corresponding to file to read from
658 * @bin_attr: struct bin_attribute for this file
659 * @buf: buffer containing value to be written
660 * @off: offset into legacy I/O port space
661 * @count: number of bytes to write
663 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
664 * callback routine (pci_legacy_write).
667 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
668 struct bin_attribute *bin_attr,
669 char *buf, loff_t off, size_t count)
671 struct pci_bus *bus = to_pci_bus(container_of(kobj,
674 /* Only support 1, 2 or 4 byte accesses */
675 if (count != 1 && count != 2 && count != 4)
678 return pci_legacy_write(bus, off, *(u32 *)buf, count);
682 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
683 * @filp: open sysfs file
684 * @kobj: kobject corresponding to device to be mapped
685 * @attr: struct bin_attribute for this file
686 * @vma: struct vm_area_struct passed to mmap
688 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
689 * legacy memory space (first meg of bus space) into application virtual
693 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
694 struct bin_attribute *attr,
695 struct vm_area_struct *vma)
697 struct pci_bus *bus = to_pci_bus(container_of(kobj,
701 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
705 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
706 * @filp: open sysfs file
707 * @kobj: kobject corresponding to device to be mapped
708 * @attr: struct bin_attribute for this file
709 * @vma: struct vm_area_struct passed to mmap
711 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
712 * legacy IO space (first meg of bus space) into application virtual
713 * memory space. Returns -ENOSYS if the operation isn't supported
716 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
717 struct bin_attribute *attr,
718 struct vm_area_struct *vma)
720 struct pci_bus *bus = to_pci_bus(container_of(kobj,
724 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
728 * pci_adjust_legacy_attr - adjustment of legacy file attributes
729 * @b: bus to create files under
730 * @mmap_type: I/O port or memory
732 * Stub implementation. Can be overridden by arch if necessary.
735 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
741 * pci_create_legacy_files - create legacy I/O port and memory files
742 * @b: bus to create files under
744 * Some platforms allow access to legacy I/O port and ISA memory space on
745 * a per-bus basis. This routine creates the files and ties them into
746 * their associated read, write and mmap files from pci-sysfs.c
748 * On error unwind, but don't propagate the error to the caller
749 * as it is ok to set up the PCI bus without these files.
751 void pci_create_legacy_files(struct pci_bus *b)
755 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
760 sysfs_bin_attr_init(b->legacy_io);
761 b->legacy_io->attr.name = "legacy_io";
762 b->legacy_io->size = 0xffff;
763 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
764 b->legacy_io->read = pci_read_legacy_io;
765 b->legacy_io->write = pci_write_legacy_io;
766 b->legacy_io->mmap = pci_mmap_legacy_io;
767 pci_adjust_legacy_attr(b, pci_mmap_io);
768 error = device_create_bin_file(&b->dev, b->legacy_io);
772 /* Allocated above after the legacy_io struct */
773 b->legacy_mem = b->legacy_io + 1;
774 sysfs_bin_attr_init(b->legacy_mem);
775 b->legacy_mem->attr.name = "legacy_mem";
776 b->legacy_mem->size = 1024*1024;
777 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
778 b->legacy_mem->mmap = pci_mmap_legacy_mem;
779 pci_adjust_legacy_attr(b, pci_mmap_mem);
780 error = device_create_bin_file(&b->dev, b->legacy_mem);
787 device_remove_bin_file(&b->dev, b->legacy_io);
792 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
793 "and ISA memory resources to sysfs\n");
797 void pci_remove_legacy_files(struct pci_bus *b)
800 device_remove_bin_file(&b->dev, b->legacy_io);
801 device_remove_bin_file(&b->dev, b->legacy_mem);
802 kfree(b->legacy_io); /* both are allocated here */
805 #endif /* HAVE_PCI_LEGACY */
809 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
810 enum pci_mmap_api mmap_api)
812 unsigned long nr, start, size, pci_start;
814 if (pci_resource_len(pdev, resno) == 0)
816 nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
817 start = vma->vm_pgoff;
818 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
819 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
820 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
821 if (start >= pci_start && start < pci_start + size &&
822 start + nr <= pci_start + size)
828 * pci_mmap_resource - map a PCI resource into user memory space
829 * @kobj: kobject for mapping
830 * @attr: struct bin_attribute for the file being mapped
831 * @vma: struct vm_area_struct passed into the mmap
832 * @write_combine: 1 for write_combine mapping
834 * Use the regular PCI mapping routines to map a PCI resource into userspace.
837 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
838 struct vm_area_struct *vma, int write_combine)
840 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
841 struct device, kobj));
842 struct resource *res = attr->private;
843 enum pci_mmap_state mmap_type;
844 resource_size_t start, end;
847 for (i = 0; i < PCI_ROM_RESOURCE; i++)
848 if (res == &pdev->resource[i])
850 if (i >= PCI_ROM_RESOURCE)
853 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
854 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
855 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
856 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
858 (u64)pci_resource_start(pdev, i),
859 (u64)pci_resource_len(pdev, i));
863 /* pci_mmap_page_range() expects the same kind of entry as coming
864 * from /proc/bus/pci/ which is a "user visible" value. If this is
865 * different from the resource itself, arch will do necessary fixup.
867 pci_resource_to_user(pdev, i, res, &start, &end);
868 vma->vm_pgoff += start >> PAGE_SHIFT;
869 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
871 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
874 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
878 pci_mmap_resource_uc(struct file *filp, struct kobject *kobj,
879 struct bin_attribute *attr,
880 struct vm_area_struct *vma)
882 return pci_mmap_resource(kobj, attr, vma, 0);
886 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
887 struct bin_attribute *attr,
888 struct vm_area_struct *vma)
890 return pci_mmap_resource(kobj, attr, vma, 1);
894 pci_resource_io(struct file *filp, struct kobject *kobj,
895 struct bin_attribute *attr, char *buf,
896 loff_t off, size_t count, bool write)
898 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
899 struct device, kobj));
900 struct resource *res = attr->private;
901 unsigned long port = off;
904 for (i = 0; i < PCI_ROM_RESOURCE; i++)
905 if (res == &pdev->resource[i])
907 if (i >= PCI_ROM_RESOURCE)
910 port += pci_resource_start(pdev, i);
912 if (port > pci_resource_end(pdev, i))
915 if (port + count - 1 > pci_resource_end(pdev, i))
921 outb(*(u8 *)buf, port);
923 *(u8 *)buf = inb(port);
927 outw(*(u16 *)buf, port);
929 *(u16 *)buf = inw(port);
933 outl(*(u32 *)buf, port);
935 *(u32 *)buf = inl(port);
942 pci_read_resource_io(struct file *filp, struct kobject *kobj,
943 struct bin_attribute *attr, char *buf,
944 loff_t off, size_t count)
946 return pci_resource_io(filp, kobj, attr, buf, off, count, false);
950 pci_write_resource_io(struct file *filp, struct kobject *kobj,
951 struct bin_attribute *attr, char *buf,
952 loff_t off, size_t count)
954 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
958 * pci_remove_resource_files - cleanup resource files
959 * @pdev: dev to cleanup
961 * If we created resource files for @pdev, remove them from sysfs and
962 * free their resources.
965 pci_remove_resource_files(struct pci_dev *pdev)
969 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
970 struct bin_attribute *res_attr;
972 res_attr = pdev->res_attr[i];
974 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
978 res_attr = pdev->res_attr_wc[i];
980 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
986 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
988 /* allocate attribute structure, piggyback attribute name */
989 int name_len = write_combine ? 13 : 10;
990 struct bin_attribute *res_attr;
993 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
995 char *res_attr_name = (char *)(res_attr + 1);
997 sysfs_bin_attr_init(res_attr);
999 pdev->res_attr_wc[num] = res_attr;
1000 sprintf(res_attr_name, "resource%d_wc", num);
1001 res_attr->mmap = pci_mmap_resource_wc;
1003 pdev->res_attr[num] = res_attr;
1004 sprintf(res_attr_name, "resource%d", num);
1005 res_attr->mmap = pci_mmap_resource_uc;
1007 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
1008 res_attr->read = pci_read_resource_io;
1009 res_attr->write = pci_write_resource_io;
1011 res_attr->attr.name = res_attr_name;
1012 res_attr->attr.mode = S_IRUSR | S_IWUSR;
1013 res_attr->size = pci_resource_len(pdev, num);
1014 res_attr->private = &pdev->resource[num];
1015 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
1023 * pci_create_resource_files - create resource files in sysfs for @dev
1024 * @pdev: dev in question
1026 * Walk the resources in @pdev creating files for each resource available.
1028 static int pci_create_resource_files(struct pci_dev *pdev)
1033 /* Expose the PCI resources from this device as files */
1034 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1036 /* skip empty resources */
1037 if (!pci_resource_len(pdev, i))
1040 retval = pci_create_attr(pdev, i, 0);
1041 /* for prefetchable resources, create a WC mappable file */
1042 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1043 retval = pci_create_attr(pdev, i, 1);
1046 pci_remove_resource_files(pdev);
1052 #else /* !HAVE_PCI_MMAP */
1053 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1054 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1055 #endif /* HAVE_PCI_MMAP */
1058 * pci_write_rom - used to enable access to the PCI ROM display
1060 * @kobj: kernel object handle
1061 * @bin_attr: struct bin_attribute for this file
1064 * @count: number of byte in input
1066 * writing anything except 0 enables it
1069 pci_write_rom(struct file *filp, struct kobject *kobj,
1070 struct bin_attribute *bin_attr,
1071 char *buf, loff_t off, size_t count)
1073 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1075 if ((off == 0) && (*buf == '0') && (count == 2))
1076 pdev->rom_attr_enabled = 0;
1078 pdev->rom_attr_enabled = 1;
1084 * pci_read_rom - read a PCI ROM
1086 * @kobj: kernel object handle
1087 * @bin_attr: struct bin_attribute for this file
1088 * @buf: where to put the data we read from the ROM
1090 * @count: number of bytes to read
1092 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1093 * device corresponding to @kobj.
1096 pci_read_rom(struct file *filp, struct kobject *kobj,
1097 struct bin_attribute *bin_attr,
1098 char *buf, loff_t off, size_t count)
1100 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1104 if (!pdev->rom_attr_enabled)
1107 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1114 if (off + count > size)
1117 memcpy_fromio(buf, rom + off, count);
1119 pci_unmap_rom(pdev, rom);
1124 static struct bin_attribute pci_config_attr = {
1127 .mode = S_IRUGO | S_IWUSR,
1129 .size = PCI_CFG_SPACE_SIZE,
1130 .read = pci_read_config,
1131 .write = pci_write_config,
1134 static struct bin_attribute pcie_config_attr = {
1137 .mode = S_IRUGO | S_IWUSR,
1139 .size = PCI_CFG_SPACE_EXP_SIZE,
1140 .read = pci_read_config,
1141 .write = pci_write_config,
1144 int __weak pcibios_add_platform_entries(struct pci_dev *dev)
1149 static ssize_t reset_store(struct device *dev,
1150 struct device_attribute *attr, const char *buf,
1153 struct pci_dev *pdev = to_pci_dev(dev);
1155 ssize_t result = strict_strtoul(buf, 0, &val);
1163 result = pci_reset_function(pdev);
1170 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1172 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1175 struct bin_attribute *attr;
1177 /* If the device has VPD, try to expose it in sysfs. */
1179 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1183 sysfs_bin_attr_init(attr);
1184 attr->size = dev->vpd->len;
1185 attr->attr.name = "vpd";
1186 attr->attr.mode = S_IRUSR | S_IWUSR;
1187 attr->read = read_vpd_attr;
1188 attr->write = write_vpd_attr;
1189 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1194 dev->vpd->attr = attr;
1197 /* Active State Power Management */
1198 pcie_aspm_create_sysfs_dev_files(dev);
1200 if (!pci_probe_reset_function(dev)) {
1201 retval = device_create_file(&dev->dev, &reset_attr);
1209 pcie_aspm_remove_sysfs_dev_files(dev);
1210 if (dev->vpd && dev->vpd->attr) {
1211 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1212 kfree(dev->vpd->attr);
1218 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1222 struct bin_attribute *attr;
1224 if (!sysfs_initialized)
1227 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1228 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1230 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1234 retval = pci_create_resource_files(pdev);
1236 goto err_config_file;
1238 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1239 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1240 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1243 /* If the device has a ROM, try to expose it in sysfs. */
1245 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1248 goto err_resource_files;
1250 sysfs_bin_attr_init(attr);
1251 attr->size = rom_size;
1252 attr->attr.name = "rom";
1253 attr->attr.mode = S_IRUSR | S_IWUSR;
1254 attr->read = pci_read_rom;
1255 attr->write = pci_write_rom;
1256 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1259 goto err_resource_files;
1261 pdev->rom_attr = attr;
1264 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1265 retval = device_create_file(&pdev->dev, &vga_attr);
1270 /* add platform-specific attributes */
1271 retval = pcibios_add_platform_entries(pdev);
1275 /* add sysfs entries for various capabilities */
1276 retval = pci_create_capabilities_sysfs(pdev);
1280 pci_create_firmware_label_files(pdev);
1285 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1286 device_remove_file(&pdev->dev, &vga_attr);
1289 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1290 kfree(pdev->rom_attr);
1291 pdev->rom_attr = NULL;
1294 pci_remove_resource_files(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);
1304 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1306 if (dev->vpd && dev->vpd->attr) {
1307 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1308 kfree(dev->vpd->attr);
1311 pcie_aspm_remove_sysfs_dev_files(dev);
1312 if (dev->reset_fn) {
1313 device_remove_file(&dev->dev, &reset_attr);
1319 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1320 * @pdev: device whose entries we should free
1322 * Cleanup when @pdev is removed from sysfs.
1324 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1328 if (!sysfs_initialized)
1331 pci_remove_capabilities_sysfs(pdev);
1333 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1334 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1336 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1338 pci_remove_resource_files(pdev);
1340 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1341 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1342 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1345 if (rom_size && pdev->rom_attr) {
1346 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1347 kfree(pdev->rom_attr);
1350 pci_remove_firmware_label_files(pdev);
1354 static int __init pci_sysfs_init(void)
1356 struct pci_dev *pdev = NULL;
1359 sysfs_initialized = 1;
1360 for_each_pci_dev(pdev) {
1361 retval = pci_create_sysfs_dev_files(pdev);
1371 late_initcall(pci_sysfs_init);