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>
33 static int sysfs_initialized; /* = 0 */
35 /* show configuration fields */
36 #define pci_config_attr(field, format_string) \
38 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
40 struct pci_dev *pdev; \
42 pdev = to_pci_dev (dev); \
43 return sprintf (buf, format_string, pdev->field); \
46 pci_config_attr(vendor, "0x%04x\n");
47 pci_config_attr(device, "0x%04x\n");
48 pci_config_attr(subsystem_vendor, "0x%04x\n");
49 pci_config_attr(subsystem_device, "0x%04x\n");
50 pci_config_attr(class, "0x%06x\n");
51 pci_config_attr(irq, "%u\n");
53 static ssize_t broken_parity_status_show(struct device *dev,
54 struct device_attribute *attr,
57 struct pci_dev *pdev = to_pci_dev(dev);
58 return sprintf (buf, "%u\n", pdev->broken_parity_status);
61 static ssize_t broken_parity_status_store(struct device *dev,
62 struct device_attribute *attr,
63 const char *buf, size_t count)
65 struct pci_dev *pdev = to_pci_dev(dev);
68 if (strict_strtoul(buf, 0, &val) < 0)
71 pdev->broken_parity_status = !!val;
76 static ssize_t local_cpus_show(struct device *dev,
77 struct device_attribute *attr, char *buf)
79 const struct cpumask *mask;
83 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
84 cpumask_of_node(dev_to_node(dev));
86 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
88 len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
95 static ssize_t local_cpulist_show(struct device *dev,
96 struct device_attribute *attr, char *buf)
98 const struct cpumask *mask;
102 mask = (dev_to_node(dev) == -1) ? cpu_online_mask :
103 cpumask_of_node(dev_to_node(dev));
105 mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
107 len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
114 * PCI Bus Class Devices
116 static ssize_t pci_bus_show_cpuaffinity(struct device *dev,
118 struct device_attribute *attr,
122 const struct cpumask *cpumask;
124 cpumask = cpumask_of_pcibus(to_pci_bus(dev));
126 cpulist_scnprintf(buf, PAGE_SIZE-2, cpumask) :
127 cpumask_scnprintf(buf, PAGE_SIZE-2, cpumask);
133 static inline ssize_t pci_bus_show_cpumaskaffinity(struct device *dev,
134 struct device_attribute *attr,
137 return pci_bus_show_cpuaffinity(dev, 0, attr, buf);
140 static inline ssize_t pci_bus_show_cpulistaffinity(struct device *dev,
141 struct device_attribute *attr,
144 return pci_bus_show_cpuaffinity(dev, 1, attr, buf);
149 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
151 struct pci_dev * pci_dev = to_pci_dev(dev);
155 resource_size_t start, end;
157 if (pci_dev->subordinate)
158 max = DEVICE_COUNT_RESOURCE;
160 max = PCI_BRIDGE_RESOURCES;
162 for (i = 0; i < max; i++) {
163 struct resource *res = &pci_dev->resource[i];
164 pci_resource_to_user(pci_dev, i, res, &start, &end);
165 str += sprintf(str,"0x%016llx 0x%016llx 0x%016llx\n",
166 (unsigned long long)start,
167 (unsigned long long)end,
168 (unsigned long long)res->flags);
173 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
175 struct pci_dev *pci_dev = to_pci_dev(dev);
177 return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
178 pci_dev->vendor, pci_dev->device,
179 pci_dev->subsystem_vendor, pci_dev->subsystem_device,
180 (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
181 (u8)(pci_dev->class));
184 static ssize_t is_enabled_store(struct device *dev,
185 struct device_attribute *attr, const char *buf,
188 struct pci_dev *pdev = to_pci_dev(dev);
190 ssize_t result = strict_strtoul(buf, 0, &val);
195 /* this can crash the machine when done on the "wrong" device */
196 if (!capable(CAP_SYS_ADMIN))
200 if (pci_is_enabled(pdev))
201 pci_disable_device(pdev);
205 result = pci_enable_device(pdev);
207 return result < 0 ? result : count;
210 static ssize_t is_enabled_show(struct device *dev,
211 struct device_attribute *attr, char *buf)
213 struct pci_dev *pdev;
215 pdev = to_pci_dev (dev);
216 return sprintf (buf, "%u\n", atomic_read(&pdev->enable_cnt));
221 numa_node_show(struct device *dev, struct device_attribute *attr, char *buf)
223 return sprintf (buf, "%d\n", dev->numa_node);
228 dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
230 struct pci_dev *pdev = to_pci_dev(dev);
232 return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
236 consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
239 return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
243 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
245 struct pci_dev *pdev = to_pci_dev(dev);
247 if (!pdev->subordinate)
250 return sprintf (buf, "%u\n",
251 !(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI));
255 msi_bus_store(struct device *dev, struct device_attribute *attr,
256 const char *buf, size_t count)
258 struct pci_dev *pdev = to_pci_dev(dev);
261 if (strict_strtoul(buf, 0, &val) < 0)
264 /* bad things may happen if the no_msi flag is changed
265 * while some drivers are loaded */
266 if (!capable(CAP_SYS_ADMIN))
269 /* Maybe pci devices without subordinate busses shouldn't even have this
270 * attribute in the first place? */
271 if (!pdev->subordinate)
274 /* Is the flag going to change, or keep the value it already had? */
275 if (!(pdev->subordinate->bus_flags & PCI_BUS_FLAGS_NO_MSI) ^
277 pdev->subordinate->bus_flags ^= PCI_BUS_FLAGS_NO_MSI;
279 dev_warn(&pdev->dev, "forced subordinate bus to%s support MSI,"
280 " bad things could happen\n", val ? "" : " not");
286 #ifdef CONFIG_HOTPLUG
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);
381 struct device_attribute pci_dev_attrs[] = {
385 __ATTR_RO(subsystem_vendor),
386 __ATTR_RO(subsystem_device),
389 __ATTR_RO(local_cpus),
390 __ATTR_RO(local_cpulist),
393 __ATTR_RO(numa_node),
395 __ATTR_RO(dma_mask_bits),
396 __ATTR_RO(consistent_dma_mask_bits),
397 __ATTR(enable, 0600, is_enabled_show, is_enabled_store),
398 __ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
399 broken_parity_status_show,broken_parity_status_store),
400 __ATTR(msi_bus, 0644, msi_bus_show, msi_bus_store),
401 #ifdef CONFIG_HOTPLUG
402 __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
403 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
408 struct device_attribute pcibus_dev_attrs[] = {
409 #ifdef CONFIG_HOTPLUG
410 __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_bus_rescan_store),
412 __ATTR(cpuaffinity, S_IRUGO, pci_bus_show_cpumaskaffinity, NULL),
413 __ATTR(cpulistaffinity, S_IRUGO, pci_bus_show_cpulistaffinity, NULL),
418 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
420 struct pci_dev *pdev = to_pci_dev(dev);
421 struct pci_dev *vga_dev = vga_default_device();
424 return sprintf(buf, "%u\n", (pdev == vga_dev));
426 return sprintf(buf, "%u\n",
427 !!(pdev->resource[PCI_ROM_RESOURCE].flags &
428 IORESOURCE_ROM_SHADOW));
430 struct device_attribute vga_attr = __ATTR_RO(boot_vga);
433 pci_read_config(struct file *filp, struct kobject *kobj,
434 struct bin_attribute *bin_attr,
435 char *buf, loff_t off, size_t count)
437 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
438 unsigned int size = 64;
439 loff_t init_off = off;
440 u8 *data = (u8*) buf;
442 /* Several chips lock up trying to read undefined config space */
443 if (security_capable(filp->f_cred, &init_user_ns, CAP_SYS_ADMIN) == 0) {
444 size = dev->cfg_size;
445 } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
451 if (off + count > size) {
458 if ((off & 1) && size) {
460 pci_user_read_config_byte(dev, off, &val);
461 data[off - init_off] = val;
466 if ((off & 3) && size > 2) {
468 pci_user_read_config_word(dev, off, &val);
469 data[off - init_off] = val & 0xff;
470 data[off - init_off + 1] = (val >> 8) & 0xff;
477 pci_user_read_config_dword(dev, off, &val);
478 data[off - init_off] = val & 0xff;
479 data[off - init_off + 1] = (val >> 8) & 0xff;
480 data[off - init_off + 2] = (val >> 16) & 0xff;
481 data[off - init_off + 3] = (val >> 24) & 0xff;
488 pci_user_read_config_word(dev, off, &val);
489 data[off - init_off] = val & 0xff;
490 data[off - init_off + 1] = (val >> 8) & 0xff;
497 pci_user_read_config_byte(dev, off, &val);
498 data[off - init_off] = val;
507 pci_write_config(struct file* filp, struct kobject *kobj,
508 struct bin_attribute *bin_attr,
509 char *buf, loff_t off, size_t count)
511 struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
512 unsigned int size = count;
513 loff_t init_off = off;
514 u8 *data = (u8*) buf;
516 if (off > dev->cfg_size)
518 if (off + count > dev->cfg_size) {
519 size = dev->cfg_size - off;
523 if ((off & 1) && size) {
524 pci_user_write_config_byte(dev, off, data[off - init_off]);
529 if ((off & 3) && size > 2) {
530 u16 val = data[off - init_off];
531 val |= (u16) data[off - init_off + 1] << 8;
532 pci_user_write_config_word(dev, off, val);
538 u32 val = data[off - init_off];
539 val |= (u32) data[off - init_off + 1] << 8;
540 val |= (u32) data[off - init_off + 2] << 16;
541 val |= (u32) data[off - init_off + 3] << 24;
542 pci_user_write_config_dword(dev, off, val);
548 u16 val = data[off - init_off];
549 val |= (u16) data[off - init_off + 1] << 8;
550 pci_user_write_config_word(dev, off, val);
556 pci_user_write_config_byte(dev, off, data[off - init_off]);
565 read_vpd_attr(struct file *filp, struct kobject *kobj,
566 struct bin_attribute *bin_attr,
567 char *buf, loff_t off, size_t count)
569 struct pci_dev *dev =
570 to_pci_dev(container_of(kobj, struct device, kobj));
572 if (off > bin_attr->size)
574 else if (count > bin_attr->size - off)
575 count = bin_attr->size - off;
577 return pci_read_vpd(dev, off, count, buf);
581 write_vpd_attr(struct file *filp, struct kobject *kobj,
582 struct bin_attribute *bin_attr,
583 char *buf, loff_t off, size_t count)
585 struct pci_dev *dev =
586 to_pci_dev(container_of(kobj, struct device, kobj));
588 if (off > bin_attr->size)
590 else if (count > bin_attr->size - off)
591 count = bin_attr->size - off;
593 return pci_write_vpd(dev, off, count, buf);
596 #ifdef HAVE_PCI_LEGACY
598 * pci_read_legacy_io - read byte(s) from legacy I/O port space
599 * @filp: open sysfs file
600 * @kobj: kobject corresponding to file to read from
601 * @bin_attr: struct bin_attribute for this file
602 * @buf: buffer to store results
603 * @off: offset into legacy I/O port space
604 * @count: number of bytes to read
606 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
607 * callback routine (pci_legacy_read).
610 pci_read_legacy_io(struct file *filp, struct kobject *kobj,
611 struct bin_attribute *bin_attr,
612 char *buf, loff_t off, size_t count)
614 struct pci_bus *bus = to_pci_bus(container_of(kobj,
618 /* Only support 1, 2 or 4 byte accesses */
619 if (count != 1 && count != 2 && count != 4)
622 return pci_legacy_read(bus, off, (u32 *)buf, count);
626 * pci_write_legacy_io - write byte(s) to legacy I/O port space
627 * @filp: open sysfs file
628 * @kobj: kobject corresponding to file to read from
629 * @bin_attr: struct bin_attribute for this file
630 * @buf: buffer containing value to be written
631 * @off: offset into legacy I/O port space
632 * @count: number of bytes to write
634 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
635 * callback routine (pci_legacy_write).
638 pci_write_legacy_io(struct file *filp, struct kobject *kobj,
639 struct bin_attribute *bin_attr,
640 char *buf, loff_t off, size_t count)
642 struct pci_bus *bus = to_pci_bus(container_of(kobj,
645 /* Only support 1, 2 or 4 byte accesses */
646 if (count != 1 && count != 2 && count != 4)
649 return pci_legacy_write(bus, off, *(u32 *)buf, count);
653 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
654 * @filp: open sysfs file
655 * @kobj: kobject corresponding to device to be mapped
656 * @attr: struct bin_attribute for this file
657 * @vma: struct vm_area_struct passed to mmap
659 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
660 * legacy memory space (first meg of bus space) into application virtual
664 pci_mmap_legacy_mem(struct file *filp, struct kobject *kobj,
665 struct bin_attribute *attr,
666 struct vm_area_struct *vma)
668 struct pci_bus *bus = to_pci_bus(container_of(kobj,
672 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_mem);
676 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
677 * @filp: open sysfs file
678 * @kobj: kobject corresponding to device to be mapped
679 * @attr: struct bin_attribute for this file
680 * @vma: struct vm_area_struct passed to mmap
682 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
683 * legacy IO space (first meg of bus space) into application virtual
684 * memory space. Returns -ENOSYS if the operation isn't supported
687 pci_mmap_legacy_io(struct file *filp, struct kobject *kobj,
688 struct bin_attribute *attr,
689 struct vm_area_struct *vma)
691 struct pci_bus *bus = to_pci_bus(container_of(kobj,
695 return pci_mmap_legacy_page_range(bus, vma, pci_mmap_io);
699 * pci_adjust_legacy_attr - adjustment of legacy file attributes
700 * @b: bus to create files under
701 * @mmap_type: I/O port or memory
703 * Stub implementation. Can be overridden by arch if necessary.
706 pci_adjust_legacy_attr(struct pci_bus *b, enum pci_mmap_state mmap_type)
712 * pci_create_legacy_files - create legacy I/O port and memory files
713 * @b: bus to create files under
715 * Some platforms allow access to legacy I/O port and ISA memory space on
716 * a per-bus basis. This routine creates the files and ties them into
717 * their associated read, write and mmap files from pci-sysfs.c
719 * On error unwind, but don't propagate the error to the caller
720 * as it is ok to set up the PCI bus without these files.
722 void pci_create_legacy_files(struct pci_bus *b)
726 b->legacy_io = kzalloc(sizeof(struct bin_attribute) * 2,
731 sysfs_bin_attr_init(b->legacy_io);
732 b->legacy_io->attr.name = "legacy_io";
733 b->legacy_io->size = 0xffff;
734 b->legacy_io->attr.mode = S_IRUSR | S_IWUSR;
735 b->legacy_io->read = pci_read_legacy_io;
736 b->legacy_io->write = pci_write_legacy_io;
737 b->legacy_io->mmap = pci_mmap_legacy_io;
738 pci_adjust_legacy_attr(b, pci_mmap_io);
739 error = device_create_bin_file(&b->dev, b->legacy_io);
743 /* Allocated above after the legacy_io struct */
744 b->legacy_mem = b->legacy_io + 1;
745 sysfs_bin_attr_init(b->legacy_mem);
746 b->legacy_mem->attr.name = "legacy_mem";
747 b->legacy_mem->size = 1024*1024;
748 b->legacy_mem->attr.mode = S_IRUSR | S_IWUSR;
749 b->legacy_mem->mmap = pci_mmap_legacy_mem;
750 pci_adjust_legacy_attr(b, pci_mmap_mem);
751 error = device_create_bin_file(&b->dev, b->legacy_mem);
758 device_remove_bin_file(&b->dev, b->legacy_io);
763 printk(KERN_WARNING "pci: warning: could not create legacy I/O port "
764 "and ISA memory resources to sysfs\n");
768 void pci_remove_legacy_files(struct pci_bus *b)
771 device_remove_bin_file(&b->dev, b->legacy_io);
772 device_remove_bin_file(&b->dev, b->legacy_mem);
773 kfree(b->legacy_io); /* both are allocated here */
776 #endif /* HAVE_PCI_LEGACY */
780 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vma,
781 enum pci_mmap_api mmap_api)
783 unsigned long nr, start, size, pci_start;
785 if (pci_resource_len(pdev, resno) == 0)
787 nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
788 start = vma->vm_pgoff;
789 size = ((pci_resource_len(pdev, resno) - 1) >> PAGE_SHIFT) + 1;
790 pci_start = (mmap_api == PCI_MMAP_PROCFS) ?
791 pci_resource_start(pdev, resno) >> PAGE_SHIFT : 0;
792 if (start >= pci_start && start < pci_start + size &&
793 start + nr <= pci_start + size)
799 * pci_mmap_resource - map a PCI resource into user memory space
800 * @kobj: kobject for mapping
801 * @attr: struct bin_attribute for the file being mapped
802 * @vma: struct vm_area_struct passed into the mmap
803 * @write_combine: 1 for write_combine mapping
805 * Use the regular PCI mapping routines to map a PCI resource into userspace.
808 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
809 struct vm_area_struct *vma, int write_combine)
811 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
812 struct device, kobj));
813 struct resource *res = attr->private;
814 enum pci_mmap_state mmap_type;
815 resource_size_t start, end;
818 for (i = 0; i < PCI_ROM_RESOURCE; i++)
819 if (res == &pdev->resource[i])
821 if (i >= PCI_ROM_RESOURCE)
824 if (!pci_mmap_fits(pdev, i, vma, PCI_MMAP_SYSFS)) {
825 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
826 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
827 current->comm, vma->vm_end-vma->vm_start, vma->vm_pgoff,
829 (u64)pci_resource_start(pdev, i),
830 (u64)pci_resource_len(pdev, i));
834 /* pci_mmap_page_range() expects the same kind of entry as coming
835 * from /proc/bus/pci/ which is a "user visible" value. If this is
836 * different from the resource itself, arch will do necessary fixup.
838 pci_resource_to_user(pdev, i, res, &start, &end);
839 vma->vm_pgoff += start >> PAGE_SHIFT;
840 mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
842 if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(start))
845 return pci_mmap_page_range(pdev, vma, mmap_type, write_combine);
849 pci_mmap_resource_uc(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, 0);
857 pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
858 struct bin_attribute *attr,
859 struct vm_area_struct *vma)
861 return pci_mmap_resource(kobj, attr, vma, 1);
865 pci_resource_io(struct file *filp, struct kobject *kobj,
866 struct bin_attribute *attr, char *buf,
867 loff_t off, size_t count, bool write)
869 struct pci_dev *pdev = to_pci_dev(container_of(kobj,
870 struct device, kobj));
871 struct resource *res = attr->private;
872 unsigned long port = off;
875 for (i = 0; i < PCI_ROM_RESOURCE; i++)
876 if (res == &pdev->resource[i])
878 if (i >= PCI_ROM_RESOURCE)
881 port += pci_resource_start(pdev, i);
883 if (port > pci_resource_end(pdev, i))
886 if (port + count - 1 > pci_resource_end(pdev, i))
892 outb(*(u8 *)buf, port);
894 *(u8 *)buf = inb(port);
898 outw(*(u16 *)buf, port);
900 *(u16 *)buf = inw(port);
904 outl(*(u32 *)buf, port);
906 *(u32 *)buf = inl(port);
913 pci_read_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, false);
921 pci_write_resource_io(struct file *filp, struct kobject *kobj,
922 struct bin_attribute *attr, char *buf,
923 loff_t off, size_t count)
925 return pci_resource_io(filp, kobj, attr, buf, off, count, true);
929 * pci_remove_resource_files - cleanup resource files
930 * @pdev: dev to cleanup
932 * If we created resource files for @pdev, remove them from sysfs and
933 * free their resources.
936 pci_remove_resource_files(struct pci_dev *pdev)
940 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
941 struct bin_attribute *res_attr;
943 res_attr = pdev->res_attr[i];
945 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
949 res_attr = pdev->res_attr_wc[i];
951 sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
957 static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
959 /* allocate attribute structure, piggyback attribute name */
960 int name_len = write_combine ? 13 : 10;
961 struct bin_attribute *res_attr;
964 res_attr = kzalloc(sizeof(*res_attr) + name_len, GFP_ATOMIC);
966 char *res_attr_name = (char *)(res_attr + 1);
968 sysfs_bin_attr_init(res_attr);
970 pdev->res_attr_wc[num] = res_attr;
971 sprintf(res_attr_name, "resource%d_wc", num);
972 res_attr->mmap = pci_mmap_resource_wc;
974 pdev->res_attr[num] = res_attr;
975 sprintf(res_attr_name, "resource%d", num);
976 res_attr->mmap = pci_mmap_resource_uc;
978 if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
979 res_attr->read = pci_read_resource_io;
980 res_attr->write = pci_write_resource_io;
982 res_attr->attr.name = res_attr_name;
983 res_attr->attr.mode = S_IRUSR | S_IWUSR;
984 res_attr->size = pci_resource_len(pdev, num);
985 res_attr->private = &pdev->resource[num];
986 retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
994 * pci_create_resource_files - create resource files in sysfs for @dev
995 * @pdev: dev in question
997 * Walk the resources in @pdev creating files for each resource available.
999 static int pci_create_resource_files(struct pci_dev *pdev)
1004 /* Expose the PCI resources from this device as files */
1005 for (i = 0; i < PCI_ROM_RESOURCE; i++) {
1007 /* skip empty resources */
1008 if (!pci_resource_len(pdev, i))
1011 retval = pci_create_attr(pdev, i, 0);
1012 /* for prefetchable resources, create a WC mappable file */
1013 if (!retval && pdev->resource[i].flags & IORESOURCE_PREFETCH)
1014 retval = pci_create_attr(pdev, i, 1);
1017 pci_remove_resource_files(pdev);
1023 #else /* !HAVE_PCI_MMAP */
1024 int __weak pci_create_resource_files(struct pci_dev *dev) { return 0; }
1025 void __weak pci_remove_resource_files(struct pci_dev *dev) { return; }
1026 #endif /* HAVE_PCI_MMAP */
1029 * pci_write_rom - used to enable access to the PCI ROM display
1031 * @kobj: kernel object handle
1032 * @bin_attr: struct bin_attribute for this file
1035 * @count: number of byte in input
1037 * writing anything except 0 enables it
1040 pci_write_rom(struct file *filp, struct kobject *kobj,
1041 struct bin_attribute *bin_attr,
1042 char *buf, loff_t off, size_t count)
1044 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1046 if ((off == 0) && (*buf == '0') && (count == 2))
1047 pdev->rom_attr_enabled = 0;
1049 pdev->rom_attr_enabled = 1;
1055 * pci_read_rom - read a PCI ROM
1057 * @kobj: kernel object handle
1058 * @bin_attr: struct bin_attribute for this file
1059 * @buf: where to put the data we read from the ROM
1061 * @count: number of bytes to read
1063 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1064 * device corresponding to @kobj.
1067 pci_read_rom(struct file *filp, struct kobject *kobj,
1068 struct bin_attribute *bin_attr,
1069 char *buf, loff_t off, size_t count)
1071 struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
1075 if (!pdev->rom_attr_enabled)
1078 rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
1085 if (off + count > size)
1088 memcpy_fromio(buf, rom + off, count);
1090 pci_unmap_rom(pdev, rom);
1095 static struct bin_attribute pci_config_attr = {
1098 .mode = S_IRUGO | S_IWUSR,
1100 .size = PCI_CFG_SPACE_SIZE,
1101 .read = pci_read_config,
1102 .write = pci_write_config,
1105 static struct bin_attribute pcie_config_attr = {
1108 .mode = S_IRUGO | S_IWUSR,
1110 .size = PCI_CFG_SPACE_EXP_SIZE,
1111 .read = pci_read_config,
1112 .write = pci_write_config,
1115 int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
1120 static ssize_t reset_store(struct device *dev,
1121 struct device_attribute *attr, const char *buf,
1124 struct pci_dev *pdev = to_pci_dev(dev);
1126 ssize_t result = strict_strtoul(buf, 0, &val);
1134 result = pci_reset_function(pdev);
1141 static struct device_attribute reset_attr = __ATTR(reset, 0200, NULL, reset_store);
1143 static int pci_create_capabilities_sysfs(struct pci_dev *dev)
1146 struct bin_attribute *attr;
1148 /* If the device has VPD, try to expose it in sysfs. */
1150 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1154 sysfs_bin_attr_init(attr);
1155 attr->size = dev->vpd->len;
1156 attr->attr.name = "vpd";
1157 attr->attr.mode = S_IRUSR | S_IWUSR;
1158 attr->read = read_vpd_attr;
1159 attr->write = write_vpd_attr;
1160 retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
1165 dev->vpd->attr = attr;
1168 /* Active State Power Management */
1169 pcie_aspm_create_sysfs_dev_files(dev);
1171 if (!pci_probe_reset_function(dev)) {
1172 retval = device_create_file(&dev->dev, &reset_attr);
1180 pcie_aspm_remove_sysfs_dev_files(dev);
1181 if (dev->vpd && dev->vpd->attr) {
1182 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1183 kfree(dev->vpd->attr);
1189 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
1193 struct bin_attribute *attr;
1195 if (!sysfs_initialized)
1198 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1199 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
1201 retval = sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1205 retval = pci_create_resource_files(pdev);
1207 goto err_config_file;
1209 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1210 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1211 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1214 /* If the device has a ROM, try to expose it in sysfs. */
1216 attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
1219 goto err_resource_files;
1221 sysfs_bin_attr_init(attr);
1222 attr->size = rom_size;
1223 attr->attr.name = "rom";
1224 attr->attr.mode = S_IRUSR | S_IWUSR;
1225 attr->read = pci_read_rom;
1226 attr->write = pci_write_rom;
1227 retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
1230 goto err_resource_files;
1232 pdev->rom_attr = attr;
1235 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) {
1236 retval = device_create_file(&pdev->dev, &vga_attr);
1241 /* add platform-specific attributes */
1242 retval = pcibios_add_platform_entries(pdev);
1246 /* add sysfs entries for various capabilities */
1247 retval = pci_create_capabilities_sysfs(pdev);
1251 pci_create_firmware_label_files(pdev);
1256 if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
1257 device_remove_file(&pdev->dev, &vga_attr);
1260 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1261 kfree(pdev->rom_attr);
1262 pdev->rom_attr = NULL;
1265 pci_remove_resource_files(pdev);
1267 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1268 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1270 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1275 static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
1277 if (dev->vpd && dev->vpd->attr) {
1278 sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
1279 kfree(dev->vpd->attr);
1282 pcie_aspm_remove_sysfs_dev_files(dev);
1283 if (dev->reset_fn) {
1284 device_remove_file(&dev->dev, &reset_attr);
1290 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1291 * @pdev: device whose entries we should free
1293 * Cleanup when @pdev is removed from sysfs.
1295 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
1299 if (!sysfs_initialized)
1302 pci_remove_capabilities_sysfs(pdev);
1304 if (pdev->cfg_size < PCI_CFG_SPACE_EXP_SIZE)
1305 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
1307 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
1309 pci_remove_resource_files(pdev);
1311 if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
1312 rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
1313 else if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
1316 if (rom_size && pdev->rom_attr) {
1317 sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
1318 kfree(pdev->rom_attr);
1321 pci_remove_firmware_label_files(pdev);
1325 static int __init pci_sysfs_init(void)
1327 struct pci_dev *pdev = NULL;
1330 sysfs_initialized = 1;
1331 for_each_pci_dev(pdev) {
1332 retval = pci_create_sysfs_dev_files(pdev);
1342 late_initcall(pci_sysfs_init);