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>
35 static int sysfs_initialized
; /* = 0 */
37 /* show configuration fields */
38 #define pci_config_attr(field, format_string) \
40 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
42 struct pci_dev *pdev; \
44 pdev = to_pci_dev(dev); \
45 return sprintf(buf, format_string, pdev->field); \
47 static DEVICE_ATTR_RO(field)
49 pci_config_attr(vendor
, "0x%04x\n");
50 pci_config_attr(device
, "0x%04x\n");
51 pci_config_attr(subsystem_vendor
, "0x%04x\n");
52 pci_config_attr(subsystem_device
, "0x%04x\n");
53 pci_config_attr(class, "0x%06x\n");
54 pci_config_attr(irq
, "%u\n");
56 static ssize_t
broken_parity_status_show(struct device
*dev
,
57 struct device_attribute
*attr
,
60 struct pci_dev
*pdev
= to_pci_dev(dev
);
61 return sprintf(buf
, "%u\n", pdev
->broken_parity_status
);
64 static ssize_t
broken_parity_status_store(struct device
*dev
,
65 struct device_attribute
*attr
,
66 const char *buf
, size_t count
)
68 struct pci_dev
*pdev
= to_pci_dev(dev
);
71 if (kstrtoul(buf
, 0, &val
) < 0)
74 pdev
->broken_parity_status
= !!val
;
78 static DEVICE_ATTR_RW(broken_parity_status
);
80 static ssize_t
pci_dev_show_local_cpu(struct device
*dev
, int type
,
81 struct device_attribute
*attr
, char *buf
)
83 const struct cpumask
*mask
;
87 mask
= (dev_to_node(dev
) == -1) ? cpu_online_mask
:
88 cpumask_of_node(dev_to_node(dev
));
90 mask
= cpumask_of_pcibus(to_pci_dev(dev
)->bus
);
93 cpumask_scnprintf(buf
, PAGE_SIZE
-2, mask
) :
94 cpulist_scnprintf(buf
, PAGE_SIZE
-2, mask
);
101 static ssize_t
local_cpus_show(struct device
*dev
,
102 struct device_attribute
*attr
, char *buf
)
104 return pci_dev_show_local_cpu(dev
, 1, attr
, buf
);
106 static DEVICE_ATTR_RO(local_cpus
);
108 static ssize_t
local_cpulist_show(struct device
*dev
,
109 struct device_attribute
*attr
, char *buf
)
111 return pci_dev_show_local_cpu(dev
, 0, attr
, buf
);
113 static DEVICE_ATTR_RO(local_cpulist
);
116 * PCI Bus Class Devices
118 static ssize_t
pci_bus_show_cpuaffinity(struct device
*dev
, int type
,
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 ssize_t
cpuaffinity_show(struct device
*dev
,
135 struct device_attribute
*attr
, char *buf
)
137 return pci_bus_show_cpuaffinity(dev
, 0, attr
, buf
);
139 static DEVICE_ATTR_RO(cpuaffinity
);
141 static ssize_t
cpulistaffinity_show(struct device
*dev
,
142 struct device_attribute
*attr
, char *buf
)
144 return pci_bus_show_cpuaffinity(dev
, 1, attr
, buf
);
146 static DEVICE_ATTR_RO(cpulistaffinity
);
149 static ssize_t
resource_show(struct device
*dev
, struct device_attribute
*attr
,
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
);
173 static DEVICE_ATTR_RO(resource
);
175 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*attr
,
178 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
180 return sprintf(buf
, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
181 pci_dev
->vendor
, pci_dev
->device
,
182 pci_dev
->subsystem_vendor
, pci_dev
->subsystem_device
,
183 (u8
)(pci_dev
->class >> 16), (u8
)(pci_dev
->class >> 8),
184 (u8
)(pci_dev
->class));
186 static DEVICE_ATTR_RO(modalias
);
188 static ssize_t
enabled_store(struct device
*dev
, struct device_attribute
*attr
,
189 const char *buf
, size_t count
)
191 struct pci_dev
*pdev
= to_pci_dev(dev
);
193 ssize_t result
= kstrtoul(buf
, 0, &val
);
198 /* this can crash the machine when done on the "wrong" device */
199 if (!capable(CAP_SYS_ADMIN
))
203 if (pci_is_enabled(pdev
))
204 pci_disable_device(pdev
);
208 result
= pci_enable_device(pdev
);
210 return result
< 0 ? result
: count
;
213 static ssize_t
enabled_show(struct device
*dev
, struct device_attribute
*attr
,
216 struct pci_dev
*pdev
;
218 pdev
= to_pci_dev(dev
);
219 return sprintf(buf
, "%u\n", atomic_read(&pdev
->enable_cnt
));
221 static DEVICE_ATTR_RW(enabled
);
224 static ssize_t
numa_node_show(struct device
*dev
, struct device_attribute
*attr
,
227 return sprintf(buf
, "%d\n", dev
->numa_node
);
229 static DEVICE_ATTR_RO(numa_node
);
232 static ssize_t
dma_mask_bits_show(struct device
*dev
,
233 struct device_attribute
*attr
, char *buf
)
235 struct pci_dev
*pdev
= to_pci_dev(dev
);
237 return sprintf(buf
, "%d\n", fls64(pdev
->dma_mask
));
239 static DEVICE_ATTR_RO(dma_mask_bits
);
241 static ssize_t
consistent_dma_mask_bits_show(struct device
*dev
,
242 struct device_attribute
*attr
,
245 return sprintf(buf
, "%d\n", fls64(dev
->coherent_dma_mask
));
247 static DEVICE_ATTR_RO(consistent_dma_mask_bits
);
249 static ssize_t
msi_bus_show(struct device
*dev
, struct device_attribute
*attr
,
252 struct pci_dev
*pdev
= to_pci_dev(dev
);
253 struct pci_bus
*subordinate
= pdev
->subordinate
;
255 return sprintf(buf
, "%u\n", subordinate
?
256 !(subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
)
260 static ssize_t
msi_bus_store(struct device
*dev
, struct device_attribute
*attr
,
261 const char *buf
, size_t count
)
263 struct pci_dev
*pdev
= to_pci_dev(dev
);
264 struct pci_bus
*subordinate
= pdev
->subordinate
;
267 if (kstrtoul(buf
, 0, &val
) < 0)
270 if (!capable(CAP_SYS_ADMIN
))
274 * "no_msi" and "bus_flags" only affect what happens when a driver
275 * requests MSI or MSI-X. They don't affect any drivers that have
276 * already requested MSI or MSI-X.
280 dev_info(&pdev
->dev
, "MSI/MSI-X %s for future drivers\n",
281 val
? "allowed" : "disallowed");
286 subordinate
->bus_flags
&= ~PCI_BUS_FLAGS_NO_MSI
;
288 subordinate
->bus_flags
|= PCI_BUS_FLAGS_NO_MSI
;
290 dev_info(&subordinate
->dev
, "MSI/MSI-X %s for future drivers of devices on this bus\n",
291 val
? "allowed" : "disallowed");
294 static DEVICE_ATTR_RW(msi_bus
);
296 static ssize_t
bus_rescan_store(struct bus_type
*bus
, const char *buf
,
300 struct pci_bus
*b
= NULL
;
302 if (kstrtoul(buf
, 0, &val
) < 0)
306 pci_lock_rescan_remove();
307 while ((b
= pci_find_next_bus(b
)) != NULL
)
309 pci_unlock_rescan_remove();
313 static BUS_ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, bus_rescan_store
);
315 static struct attribute
*pci_bus_attrs
[] = {
316 &bus_attr_rescan
.attr
,
320 static const struct attribute_group pci_bus_group
= {
321 .attrs
= pci_bus_attrs
,
324 const struct attribute_group
*pci_bus_groups
[] = {
329 static ssize_t
dev_rescan_store(struct device
*dev
,
330 struct device_attribute
*attr
, const char *buf
,
334 struct pci_dev
*pdev
= to_pci_dev(dev
);
336 if (kstrtoul(buf
, 0, &val
) < 0)
340 pci_lock_rescan_remove();
341 pci_rescan_bus(pdev
->bus
);
342 pci_unlock_rescan_remove();
346 static struct device_attribute dev_rescan_attr
= __ATTR(rescan
,
348 NULL
, dev_rescan_store
);
350 static ssize_t
remove_store(struct device
*dev
, struct device_attribute
*attr
,
351 const char *buf
, size_t count
)
355 if (kstrtoul(buf
, 0, &val
) < 0)
358 if (val
&& device_remove_file_self(dev
, attr
))
359 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev
));
362 static struct device_attribute dev_remove_attr
= __ATTR(remove
,
366 static ssize_t
dev_bus_rescan_store(struct device
*dev
,
367 struct device_attribute
*attr
,
368 const char *buf
, size_t count
)
371 struct pci_bus
*bus
= to_pci_bus(dev
);
373 if (kstrtoul(buf
, 0, &val
) < 0)
377 pci_lock_rescan_remove();
378 if (!pci_is_root_bus(bus
) && list_empty(&bus
->devices
))
379 pci_rescan_bus_bridge_resize(bus
->self
);
382 pci_unlock_rescan_remove();
386 static DEVICE_ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, dev_bus_rescan_store
);
388 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
389 static ssize_t
d3cold_allowed_store(struct device
*dev
,
390 struct device_attribute
*attr
,
391 const char *buf
, size_t count
)
393 struct pci_dev
*pdev
= to_pci_dev(dev
);
396 if (kstrtoul(buf
, 0, &val
) < 0)
399 pdev
->d3cold_allowed
= !!val
;
400 pm_runtime_resume(dev
);
405 static ssize_t
d3cold_allowed_show(struct device
*dev
,
406 struct device_attribute
*attr
, char *buf
)
408 struct pci_dev
*pdev
= to_pci_dev(dev
);
409 return sprintf(buf
, "%u\n", pdev
->d3cold_allowed
);
411 static DEVICE_ATTR_RW(d3cold_allowed
);
415 static ssize_t
devspec_show(struct device
*dev
,
416 struct device_attribute
*attr
, char *buf
)
418 struct pci_dev
*pdev
= to_pci_dev(dev
);
419 struct device_node
*np
= pci_device_to_OF_node(pdev
);
421 if (np
== NULL
|| np
->full_name
== NULL
)
423 return sprintf(buf
, "%s", np
->full_name
);
425 static DEVICE_ATTR_RO(devspec
);
428 #ifdef CONFIG_PCI_IOV
429 static ssize_t
sriov_totalvfs_show(struct device
*dev
,
430 struct device_attribute
*attr
,
433 struct pci_dev
*pdev
= to_pci_dev(dev
);
435 return sprintf(buf
, "%u\n", pci_sriov_get_totalvfs(pdev
));
439 static ssize_t
sriov_numvfs_show(struct device
*dev
,
440 struct device_attribute
*attr
,
443 struct pci_dev
*pdev
= to_pci_dev(dev
);
445 return sprintf(buf
, "%u\n", pdev
->sriov
->num_VFs
);
449 * num_vfs > 0; number of VFs to enable
450 * num_vfs = 0; disable all VFs
452 * Note: SRIOV spec doesn't allow partial VF
453 * disable, so it's all or none.
455 static ssize_t
sriov_numvfs_store(struct device
*dev
,
456 struct device_attribute
*attr
,
457 const char *buf
, size_t count
)
459 struct pci_dev
*pdev
= to_pci_dev(dev
);
463 ret
= kstrtou16(buf
, 0, &num_vfs
);
467 if (num_vfs
> pci_sriov_get_totalvfs(pdev
))
470 if (num_vfs
== pdev
->sriov
->num_VFs
)
471 return count
; /* no change */
473 /* is PF driver loaded w/callback */
474 if (!pdev
->driver
|| !pdev
->driver
->sriov_configure
) {
475 dev_info(&pdev
->dev
, "Driver doesn't support SRIOV configuration via sysfs\n");
481 ret
= pdev
->driver
->sriov_configure(pdev
, 0);
488 if (pdev
->sriov
->num_VFs
) {
489 dev_warn(&pdev
->dev
, "%d VFs already enabled. Disable before enabling %d VFs\n",
490 pdev
->sriov
->num_VFs
, num_vfs
);
494 ret
= pdev
->driver
->sriov_configure(pdev
, num_vfs
);
499 dev_warn(&pdev
->dev
, "%d VFs requested; only %d enabled\n",
505 static struct device_attribute sriov_totalvfs_attr
= __ATTR_RO(sriov_totalvfs
);
506 static struct device_attribute sriov_numvfs_attr
=
507 __ATTR(sriov_numvfs
, (S_IRUGO
|S_IWUSR
|S_IWGRP
),
508 sriov_numvfs_show
, sriov_numvfs_store
);
509 #endif /* CONFIG_PCI_IOV */
511 static ssize_t
driver_override_store(struct device
*dev
,
512 struct device_attribute
*attr
,
513 const char *buf
, size_t count
)
515 struct pci_dev
*pdev
= to_pci_dev(dev
);
516 char *driver_override
, *old
= pdev
->driver_override
, *cp
;
518 if (count
> PATH_MAX
)
521 driver_override
= kstrndup(buf
, count
, GFP_KERNEL
);
522 if (!driver_override
)
525 cp
= strchr(driver_override
, '\n');
529 if (strlen(driver_override
)) {
530 pdev
->driver_override
= driver_override
;
532 kfree(driver_override
);
533 pdev
->driver_override
= NULL
;
541 static ssize_t
driver_override_show(struct device
*dev
,
542 struct device_attribute
*attr
, char *buf
)
544 struct pci_dev
*pdev
= to_pci_dev(dev
);
546 return sprintf(buf
, "%s\n", pdev
->driver_override
);
548 static DEVICE_ATTR_RW(driver_override
);
550 static struct attribute
*pci_dev_attrs
[] = {
551 &dev_attr_resource
.attr
,
552 &dev_attr_vendor
.attr
,
553 &dev_attr_device
.attr
,
554 &dev_attr_subsystem_vendor
.attr
,
555 &dev_attr_subsystem_device
.attr
,
556 &dev_attr_class
.attr
,
558 &dev_attr_local_cpus
.attr
,
559 &dev_attr_local_cpulist
.attr
,
560 &dev_attr_modalias
.attr
,
562 &dev_attr_numa_node
.attr
,
564 &dev_attr_dma_mask_bits
.attr
,
565 &dev_attr_consistent_dma_mask_bits
.attr
,
566 &dev_attr_enabled
.attr
,
567 &dev_attr_broken_parity_status
.attr
,
568 &dev_attr_msi_bus
.attr
,
569 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
570 &dev_attr_d3cold_allowed
.attr
,
573 &dev_attr_devspec
.attr
,
575 &dev_attr_driver_override
.attr
,
579 static const struct attribute_group pci_dev_group
= {
580 .attrs
= pci_dev_attrs
,
583 const struct attribute_group
*pci_dev_groups
[] = {
588 static struct attribute
*pcibus_attrs
[] = {
589 &dev_attr_rescan
.attr
,
590 &dev_attr_cpuaffinity
.attr
,
591 &dev_attr_cpulistaffinity
.attr
,
595 static const struct attribute_group pcibus_group
= {
596 .attrs
= pcibus_attrs
,
599 const struct attribute_group
*pcibus_groups
[] = {
604 static ssize_t
boot_vga_show(struct device
*dev
, struct device_attribute
*attr
,
607 struct pci_dev
*pdev
= to_pci_dev(dev
);
608 struct pci_dev
*vga_dev
= vga_default_device();
611 return sprintf(buf
, "%u\n", (pdev
== vga_dev
));
613 return sprintf(buf
, "%u\n",
614 !!(pdev
->resource
[PCI_ROM_RESOURCE
].flags
&
615 IORESOURCE_ROM_SHADOW
));
617 static struct device_attribute vga_attr
= __ATTR_RO(boot_vga
);
619 static ssize_t
pci_read_config(struct file
*filp
, struct kobject
*kobj
,
620 struct bin_attribute
*bin_attr
, char *buf
,
621 loff_t off
, size_t count
)
623 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
, struct device
,
625 unsigned int size
= 64;
626 loff_t init_off
= off
;
627 u8
*data
= (u8
*) buf
;
629 /* Several chips lock up trying to read undefined config space */
630 if (security_capable(filp
->f_cred
, &init_user_ns
, CAP_SYS_ADMIN
) == 0)
631 size
= dev
->cfg_size
;
632 else if (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
)
637 if (off
+ count
> size
) {
644 pci_config_pm_runtime_get(dev
);
646 if ((off
& 1) && size
) {
648 pci_user_read_config_byte(dev
, off
, &val
);
649 data
[off
- init_off
] = val
;
654 if ((off
& 3) && size
> 2) {
656 pci_user_read_config_word(dev
, off
, &val
);
657 data
[off
- init_off
] = val
& 0xff;
658 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
665 pci_user_read_config_dword(dev
, off
, &val
);
666 data
[off
- init_off
] = val
& 0xff;
667 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
668 data
[off
- init_off
+ 2] = (val
>> 16) & 0xff;
669 data
[off
- init_off
+ 3] = (val
>> 24) & 0xff;
676 pci_user_read_config_word(dev
, off
, &val
);
677 data
[off
- init_off
] = val
& 0xff;
678 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
685 pci_user_read_config_byte(dev
, off
, &val
);
686 data
[off
- init_off
] = val
;
691 pci_config_pm_runtime_put(dev
);
696 static ssize_t
pci_write_config(struct file
*filp
, struct kobject
*kobj
,
697 struct bin_attribute
*bin_attr
, char *buf
,
698 loff_t off
, size_t count
)
700 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
, struct device
,
702 unsigned int size
= count
;
703 loff_t init_off
= off
;
704 u8
*data
= (u8
*) buf
;
706 if (off
> dev
->cfg_size
)
708 if (off
+ count
> dev
->cfg_size
) {
709 size
= dev
->cfg_size
- off
;
713 pci_config_pm_runtime_get(dev
);
715 if ((off
& 1) && size
) {
716 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
721 if ((off
& 3) && size
> 2) {
722 u16 val
= data
[off
- init_off
];
723 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
724 pci_user_write_config_word(dev
, off
, val
);
730 u32 val
= data
[off
- init_off
];
731 val
|= (u32
) data
[off
- init_off
+ 1] << 8;
732 val
|= (u32
) data
[off
- init_off
+ 2] << 16;
733 val
|= (u32
) data
[off
- init_off
+ 3] << 24;
734 pci_user_write_config_dword(dev
, off
, val
);
740 u16 val
= data
[off
- init_off
];
741 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
742 pci_user_write_config_word(dev
, off
, val
);
748 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
753 pci_config_pm_runtime_put(dev
);
758 static ssize_t
read_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
759 struct bin_attribute
*bin_attr
, char *buf
,
760 loff_t off
, size_t count
)
762 struct pci_dev
*dev
=
763 to_pci_dev(container_of(kobj
, struct device
, kobj
));
765 if (off
> bin_attr
->size
)
767 else if (count
> bin_attr
->size
- off
)
768 count
= bin_attr
->size
- off
;
770 return pci_read_vpd(dev
, off
, count
, buf
);
773 static ssize_t
write_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
774 struct bin_attribute
*bin_attr
, char *buf
,
775 loff_t off
, size_t count
)
777 struct pci_dev
*dev
=
778 to_pci_dev(container_of(kobj
, struct device
, kobj
));
780 if (off
> bin_attr
->size
)
782 else if (count
> bin_attr
->size
- off
)
783 count
= bin_attr
->size
- off
;
785 return pci_write_vpd(dev
, off
, count
, buf
);
788 #ifdef HAVE_PCI_LEGACY
790 * pci_read_legacy_io - read byte(s) from legacy I/O port space
791 * @filp: open sysfs file
792 * @kobj: kobject corresponding to file to read from
793 * @bin_attr: struct bin_attribute for this file
794 * @buf: buffer to store results
795 * @off: offset into legacy I/O port space
796 * @count: number of bytes to read
798 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
799 * callback routine (pci_legacy_read).
801 static ssize_t
pci_read_legacy_io(struct file
*filp
, struct kobject
*kobj
,
802 struct bin_attribute
*bin_attr
, char *buf
,
803 loff_t off
, size_t count
)
805 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
808 /* Only support 1, 2 or 4 byte accesses */
809 if (count
!= 1 && count
!= 2 && count
!= 4)
812 return pci_legacy_read(bus
, off
, (u32
*)buf
, count
);
816 * pci_write_legacy_io - write byte(s) to legacy I/O port space
817 * @filp: open sysfs file
818 * @kobj: kobject corresponding to file to read from
819 * @bin_attr: struct bin_attribute for this file
820 * @buf: buffer containing value to be written
821 * @off: offset into legacy I/O port space
822 * @count: number of bytes to write
824 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
825 * callback routine (pci_legacy_write).
827 static ssize_t
pci_write_legacy_io(struct file
*filp
, struct kobject
*kobj
,
828 struct bin_attribute
*bin_attr
, char *buf
,
829 loff_t off
, size_t count
)
831 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
834 /* Only support 1, 2 or 4 byte accesses */
835 if (count
!= 1 && count
!= 2 && count
!= 4)
838 return pci_legacy_write(bus
, off
, *(u32
*)buf
, count
);
842 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
843 * @filp: open sysfs file
844 * @kobj: kobject corresponding to device to be mapped
845 * @attr: struct bin_attribute for this file
846 * @vma: struct vm_area_struct passed to mmap
848 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
849 * legacy memory space (first meg of bus space) into application virtual
852 static int pci_mmap_legacy_mem(struct file
*filp
, struct kobject
*kobj
,
853 struct bin_attribute
*attr
,
854 struct vm_area_struct
*vma
)
856 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
859 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_mem
);
863 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
864 * @filp: open sysfs file
865 * @kobj: kobject corresponding to device to be mapped
866 * @attr: struct bin_attribute for this file
867 * @vma: struct vm_area_struct passed to mmap
869 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
870 * legacy IO space (first meg of bus space) into application virtual
871 * memory space. Returns -ENOSYS if the operation isn't supported
873 static int pci_mmap_legacy_io(struct file
*filp
, struct kobject
*kobj
,
874 struct bin_attribute
*attr
,
875 struct vm_area_struct
*vma
)
877 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
880 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_io
);
884 * pci_adjust_legacy_attr - adjustment of legacy file attributes
885 * @b: bus to create files under
886 * @mmap_type: I/O port or memory
888 * Stub implementation. Can be overridden by arch if necessary.
890 void __weak
pci_adjust_legacy_attr(struct pci_bus
*b
,
891 enum pci_mmap_state mmap_type
)
896 * pci_create_legacy_files - create legacy I/O port and memory files
897 * @b: bus to create files under
899 * Some platforms allow access to legacy I/O port and ISA memory space on
900 * a per-bus basis. This routine creates the files and ties them into
901 * their associated read, write and mmap files from pci-sysfs.c
903 * On error unwind, but don't propagate the error to the caller
904 * as it is ok to set up the PCI bus without these files.
906 void pci_create_legacy_files(struct pci_bus
*b
)
910 b
->legacy_io
= kzalloc(sizeof(struct bin_attribute
) * 2,
915 sysfs_bin_attr_init(b
->legacy_io
);
916 b
->legacy_io
->attr
.name
= "legacy_io";
917 b
->legacy_io
->size
= 0xffff;
918 b
->legacy_io
->attr
.mode
= S_IRUSR
| S_IWUSR
;
919 b
->legacy_io
->read
= pci_read_legacy_io
;
920 b
->legacy_io
->write
= pci_write_legacy_io
;
921 b
->legacy_io
->mmap
= pci_mmap_legacy_io
;
922 pci_adjust_legacy_attr(b
, pci_mmap_io
);
923 error
= device_create_bin_file(&b
->dev
, b
->legacy_io
);
927 /* Allocated above after the legacy_io struct */
928 b
->legacy_mem
= b
->legacy_io
+ 1;
929 sysfs_bin_attr_init(b
->legacy_mem
);
930 b
->legacy_mem
->attr
.name
= "legacy_mem";
931 b
->legacy_mem
->size
= 1024*1024;
932 b
->legacy_mem
->attr
.mode
= S_IRUSR
| S_IWUSR
;
933 b
->legacy_mem
->mmap
= pci_mmap_legacy_mem
;
934 pci_adjust_legacy_attr(b
, pci_mmap_mem
);
935 error
= device_create_bin_file(&b
->dev
, b
->legacy_mem
);
942 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
947 printk(KERN_WARNING
"pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
951 void pci_remove_legacy_files(struct pci_bus
*b
)
954 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
955 device_remove_bin_file(&b
->dev
, b
->legacy_mem
);
956 kfree(b
->legacy_io
); /* both are allocated here */
959 #endif /* HAVE_PCI_LEGACY */
963 int pci_mmap_fits(struct pci_dev
*pdev
, int resno
, struct vm_area_struct
*vma
,
964 enum pci_mmap_api mmap_api
)
966 unsigned long nr
, start
, size
, pci_start
;
968 if (pci_resource_len(pdev
, resno
) == 0)
971 start
= vma
->vm_pgoff
;
972 size
= ((pci_resource_len(pdev
, resno
) - 1) >> PAGE_SHIFT
) + 1;
973 pci_start
= (mmap_api
== PCI_MMAP_PROCFS
) ?
974 pci_resource_start(pdev
, resno
) >> PAGE_SHIFT
: 0;
975 if (start
>= pci_start
&& start
< pci_start
+ size
&&
976 start
+ nr
<= pci_start
+ size
)
982 * pci_mmap_resource - map a PCI resource into user memory space
983 * @kobj: kobject for mapping
984 * @attr: struct bin_attribute for the file being mapped
985 * @vma: struct vm_area_struct passed into the mmap
986 * @write_combine: 1 for write_combine mapping
988 * Use the regular PCI mapping routines to map a PCI resource into userspace.
990 static int pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
991 struct vm_area_struct
*vma
, int write_combine
)
993 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
994 struct device
, kobj
));
995 struct resource
*res
= attr
->private;
996 enum pci_mmap_state mmap_type
;
997 resource_size_t start
, end
;
1000 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
1001 if (res
== &pdev
->resource
[i
])
1003 if (i
>= PCI_ROM_RESOURCE
)
1006 if (!pci_mmap_fits(pdev
, i
, vma
, PCI_MMAP_SYSFS
)) {
1007 WARN(1, "process \"%s\" tried to map 0x%08lx bytes at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
1008 current
->comm
, vma
->vm_end
-vma
->vm_start
, vma
->vm_pgoff
,
1010 (u64
)pci_resource_start(pdev
, i
),
1011 (u64
)pci_resource_len(pdev
, i
));
1015 /* pci_mmap_page_range() expects the same kind of entry as coming
1016 * from /proc/bus/pci/ which is a "user visible" value. If this is
1017 * different from the resource itself, arch will do necessary fixup.
1019 pci_resource_to_user(pdev
, i
, res
, &start
, &end
);
1020 vma
->vm_pgoff
+= start
>> PAGE_SHIFT
;
1021 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
1023 if (res
->flags
& IORESOURCE_MEM
&& iomem_is_exclusive(start
))
1026 return pci_mmap_page_range(pdev
, vma
, mmap_type
, write_combine
);
1029 static int pci_mmap_resource_uc(struct file
*filp
, struct kobject
*kobj
,
1030 struct bin_attribute
*attr
,
1031 struct vm_area_struct
*vma
)
1033 return pci_mmap_resource(kobj
, attr
, vma
, 0);
1036 static int pci_mmap_resource_wc(struct file
*filp
, struct kobject
*kobj
,
1037 struct bin_attribute
*attr
,
1038 struct vm_area_struct
*vma
)
1040 return pci_mmap_resource(kobj
, attr
, vma
, 1);
1043 static ssize_t
pci_resource_io(struct file
*filp
, struct kobject
*kobj
,
1044 struct bin_attribute
*attr
, char *buf
,
1045 loff_t off
, size_t count
, bool write
)
1047 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
1048 struct device
, kobj
));
1049 struct resource
*res
= attr
->private;
1050 unsigned long port
= off
;
1053 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
1054 if (res
== &pdev
->resource
[i
])
1056 if (i
>= PCI_ROM_RESOURCE
)
1059 port
+= pci_resource_start(pdev
, i
);
1061 if (port
> pci_resource_end(pdev
, i
))
1064 if (port
+ count
- 1 > pci_resource_end(pdev
, i
))
1070 outb(*(u8
*)buf
, port
);
1072 *(u8
*)buf
= inb(port
);
1076 outw(*(u16
*)buf
, port
);
1078 *(u16
*)buf
= inw(port
);
1082 outl(*(u32
*)buf
, port
);
1084 *(u32
*)buf
= inl(port
);
1090 static ssize_t
pci_read_resource_io(struct file
*filp
, struct kobject
*kobj
,
1091 struct bin_attribute
*attr
, char *buf
,
1092 loff_t off
, size_t count
)
1094 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, false);
1097 static ssize_t
pci_write_resource_io(struct file
*filp
, struct kobject
*kobj
,
1098 struct bin_attribute
*attr
, char *buf
,
1099 loff_t off
, size_t count
)
1101 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, true);
1105 * pci_remove_resource_files - cleanup resource files
1106 * @pdev: dev to cleanup
1108 * If we created resource files for @pdev, remove them from sysfs and
1109 * free their resources.
1111 static void pci_remove_resource_files(struct pci_dev
*pdev
)
1115 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1116 struct bin_attribute
*res_attr
;
1118 res_attr
= pdev
->res_attr
[i
];
1120 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1124 res_attr
= pdev
->res_attr_wc
[i
];
1126 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1132 static int pci_create_attr(struct pci_dev
*pdev
, int num
, int write_combine
)
1134 /* allocate attribute structure, piggyback attribute name */
1135 int name_len
= write_combine
? 13 : 10;
1136 struct bin_attribute
*res_attr
;
1139 res_attr
= kzalloc(sizeof(*res_attr
) + name_len
, GFP_ATOMIC
);
1141 char *res_attr_name
= (char *)(res_attr
+ 1);
1143 sysfs_bin_attr_init(res_attr
);
1144 if (write_combine
) {
1145 pdev
->res_attr_wc
[num
] = res_attr
;
1146 sprintf(res_attr_name
, "resource%d_wc", num
);
1147 res_attr
->mmap
= pci_mmap_resource_wc
;
1149 pdev
->res_attr
[num
] = res_attr
;
1150 sprintf(res_attr_name
, "resource%d", num
);
1151 res_attr
->mmap
= pci_mmap_resource_uc
;
1153 if (pci_resource_flags(pdev
, num
) & IORESOURCE_IO
) {
1154 res_attr
->read
= pci_read_resource_io
;
1155 res_attr
->write
= pci_write_resource_io
;
1157 res_attr
->attr
.name
= res_attr_name
;
1158 res_attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1159 res_attr
->size
= pci_resource_len(pdev
, num
);
1160 res_attr
->private = &pdev
->resource
[num
];
1161 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
1169 * pci_create_resource_files - create resource files in sysfs for @dev
1170 * @pdev: dev in question
1172 * Walk the resources in @pdev creating files for each resource available.
1174 static int pci_create_resource_files(struct pci_dev
*pdev
)
1179 /* Expose the PCI resources from this device as files */
1180 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1182 /* skip empty resources */
1183 if (!pci_resource_len(pdev
, i
))
1186 retval
= pci_create_attr(pdev
, i
, 0);
1187 /* for prefetchable resources, create a WC mappable file */
1188 if (!retval
&& pdev
->resource
[i
].flags
& IORESOURCE_PREFETCH
)
1189 retval
= pci_create_attr(pdev
, i
, 1);
1192 pci_remove_resource_files(pdev
);
1198 #else /* !HAVE_PCI_MMAP */
1199 int __weak
pci_create_resource_files(struct pci_dev
*dev
) { return 0; }
1200 void __weak
pci_remove_resource_files(struct pci_dev
*dev
) { return; }
1201 #endif /* HAVE_PCI_MMAP */
1204 * pci_write_rom - used to enable access to the PCI ROM display
1206 * @kobj: kernel object handle
1207 * @bin_attr: struct bin_attribute for this file
1210 * @count: number of byte in input
1212 * writing anything except 0 enables it
1214 static ssize_t
pci_write_rom(struct file
*filp
, struct kobject
*kobj
,
1215 struct bin_attribute
*bin_attr
, char *buf
,
1216 loff_t off
, size_t count
)
1218 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1220 if ((off
== 0) && (*buf
== '0') && (count
== 2))
1221 pdev
->rom_attr_enabled
= 0;
1223 pdev
->rom_attr_enabled
= 1;
1229 * pci_read_rom - read a PCI ROM
1231 * @kobj: kernel object handle
1232 * @bin_attr: struct bin_attribute for this file
1233 * @buf: where to put the data we read from the ROM
1235 * @count: number of bytes to read
1237 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1238 * device corresponding to @kobj.
1240 static ssize_t
pci_read_rom(struct file
*filp
, struct kobject
*kobj
,
1241 struct bin_attribute
*bin_attr
, char *buf
,
1242 loff_t off
, size_t count
)
1244 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1248 if (!pdev
->rom_attr_enabled
)
1251 rom
= pci_map_rom(pdev
, &size
); /* size starts out as PCI window size */
1258 if (off
+ count
> size
)
1261 memcpy_fromio(buf
, rom
+ off
, count
);
1263 pci_unmap_rom(pdev
, rom
);
1268 static struct bin_attribute pci_config_attr
= {
1271 .mode
= S_IRUGO
| S_IWUSR
,
1273 .size
= PCI_CFG_SPACE_SIZE
,
1274 .read
= pci_read_config
,
1275 .write
= pci_write_config
,
1278 static struct bin_attribute pcie_config_attr
= {
1281 .mode
= S_IRUGO
| S_IWUSR
,
1283 .size
= PCI_CFG_SPACE_EXP_SIZE
,
1284 .read
= pci_read_config
,
1285 .write
= pci_write_config
,
1288 static ssize_t
reset_store(struct device
*dev
, struct device_attribute
*attr
,
1289 const char *buf
, size_t count
)
1291 struct pci_dev
*pdev
= to_pci_dev(dev
);
1293 ssize_t result
= kstrtoul(buf
, 0, &val
);
1301 result
= pci_reset_function(pdev
);
1308 static struct device_attribute reset_attr
= __ATTR(reset
, 0200, NULL
, reset_store
);
1310 static int pci_create_capabilities_sysfs(struct pci_dev
*dev
)
1313 struct bin_attribute
*attr
;
1315 /* If the device has VPD, try to expose it in sysfs. */
1317 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1321 sysfs_bin_attr_init(attr
);
1322 attr
->size
= dev
->vpd
->len
;
1323 attr
->attr
.name
= "vpd";
1324 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1325 attr
->read
= read_vpd_attr
;
1326 attr
->write
= write_vpd_attr
;
1327 retval
= sysfs_create_bin_file(&dev
->dev
.kobj
, attr
);
1332 dev
->vpd
->attr
= attr
;
1335 /* Active State Power Management */
1336 pcie_aspm_create_sysfs_dev_files(dev
);
1338 if (!pci_probe_reset_function(dev
)) {
1339 retval
= device_create_file(&dev
->dev
, &reset_attr
);
1347 pcie_aspm_remove_sysfs_dev_files(dev
);
1348 if (dev
->vpd
&& dev
->vpd
->attr
) {
1349 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1350 kfree(dev
->vpd
->attr
);
1356 int __must_check
pci_create_sysfs_dev_files(struct pci_dev
*pdev
)
1360 struct bin_attribute
*attr
;
1362 if (!sysfs_initialized
)
1365 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1366 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1368 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1372 retval
= pci_create_resource_files(pdev
);
1374 goto err_config_file
;
1376 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1377 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1378 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1381 /* If the device has a ROM, try to expose it in sysfs. */
1383 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1386 goto err_resource_files
;
1388 sysfs_bin_attr_init(attr
);
1389 attr
->size
= rom_size
;
1390 attr
->attr
.name
= "rom";
1391 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1392 attr
->read
= pci_read_rom
;
1393 attr
->write
= pci_write_rom
;
1394 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, attr
);
1397 goto err_resource_files
;
1399 pdev
->rom_attr
= attr
;
1402 /* add sysfs entries for various capabilities */
1403 retval
= pci_create_capabilities_sysfs(pdev
);
1407 pci_create_firmware_label_files(pdev
);
1413 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1414 kfree(pdev
->rom_attr
);
1415 pdev
->rom_attr
= NULL
;
1418 pci_remove_resource_files(pdev
);
1420 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1421 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1423 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1428 static void pci_remove_capabilities_sysfs(struct pci_dev
*dev
)
1430 if (dev
->vpd
&& dev
->vpd
->attr
) {
1431 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1432 kfree(dev
->vpd
->attr
);
1435 pcie_aspm_remove_sysfs_dev_files(dev
);
1436 if (dev
->reset_fn
) {
1437 device_remove_file(&dev
->dev
, &reset_attr
);
1443 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1444 * @pdev: device whose entries we should free
1446 * Cleanup when @pdev is removed from sysfs.
1448 void pci_remove_sysfs_dev_files(struct pci_dev
*pdev
)
1452 if (!sysfs_initialized
)
1455 pci_remove_capabilities_sysfs(pdev
);
1457 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1458 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1460 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1462 pci_remove_resource_files(pdev
);
1464 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1465 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1466 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1469 if (rom_size
&& pdev
->rom_attr
) {
1470 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1471 kfree(pdev
->rom_attr
);
1474 pci_remove_firmware_label_files(pdev
);
1478 static int __init
pci_sysfs_init(void)
1480 struct pci_dev
*pdev
= NULL
;
1483 sysfs_initialized
= 1;
1484 for_each_pci_dev(pdev
) {
1485 retval
= pci_create_sysfs_dev_files(pdev
);
1494 late_initcall(pci_sysfs_init
);
1496 static struct attribute
*pci_dev_dev_attrs
[] = {
1501 static umode_t
pci_dev_attrs_are_visible(struct kobject
*kobj
,
1502 struct attribute
*a
, int n
)
1504 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1505 struct pci_dev
*pdev
= to_pci_dev(dev
);
1507 if (a
== &vga_attr
.attr
)
1508 if ((pdev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
1514 static struct attribute
*pci_dev_hp_attrs
[] = {
1515 &dev_remove_attr
.attr
,
1516 &dev_rescan_attr
.attr
,
1520 static umode_t
pci_dev_hp_attrs_are_visible(struct kobject
*kobj
,
1521 struct attribute
*a
, int n
)
1523 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1524 struct pci_dev
*pdev
= to_pci_dev(dev
);
1526 if (pdev
->is_virtfn
)
1532 static struct attribute_group pci_dev_hp_attr_group
= {
1533 .attrs
= pci_dev_hp_attrs
,
1534 .is_visible
= pci_dev_hp_attrs_are_visible
,
1537 #ifdef CONFIG_PCI_IOV
1538 static struct attribute
*sriov_dev_attrs
[] = {
1539 &sriov_totalvfs_attr
.attr
,
1540 &sriov_numvfs_attr
.attr
,
1544 static umode_t
sriov_attrs_are_visible(struct kobject
*kobj
,
1545 struct attribute
*a
, int n
)
1547 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1549 if (!dev_is_pf(dev
))
1555 static struct attribute_group sriov_dev_attr_group
= {
1556 .attrs
= sriov_dev_attrs
,
1557 .is_visible
= sriov_attrs_are_visible
,
1559 #endif /* CONFIG_PCI_IOV */
1561 static struct attribute_group pci_dev_attr_group
= {
1562 .attrs
= pci_dev_dev_attrs
,
1563 .is_visible
= pci_dev_attrs_are_visible
,
1566 static const struct attribute_group
*pci_dev_attr_groups
[] = {
1567 &pci_dev_attr_group
,
1568 &pci_dev_hp_attr_group
,
1569 #ifdef CONFIG_PCI_IOV
1570 &sriov_dev_attr_group
,
1575 struct device_type pci_dev_type
= {
1576 .groups
= pci_dev_attr_groups
,