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
enable_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
enable_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(enable
);
224 static ssize_t
numa_node_store(struct device
*dev
,
225 struct device_attribute
*attr
, const char *buf
,
228 struct pci_dev
*pdev
= to_pci_dev(dev
);
231 if (!capable(CAP_SYS_ADMIN
))
234 ret
= kstrtoint(buf
, 0, &node
);
238 if (!node_online(node
))
241 add_taint(TAINT_FIRMWARE_WORKAROUND
, LOCKDEP_STILL_OK
);
242 dev_alert(&pdev
->dev
, FW_BUG
"Overriding NUMA node to %d. Contact your vendor for updates.",
245 dev
->numa_node
= node
;
249 static ssize_t
numa_node_show(struct device
*dev
, struct device_attribute
*attr
,
252 return sprintf(buf
, "%d\n", dev
->numa_node
);
254 static DEVICE_ATTR_RW(numa_node
);
257 static ssize_t
dma_mask_bits_show(struct device
*dev
,
258 struct device_attribute
*attr
, char *buf
)
260 struct pci_dev
*pdev
= to_pci_dev(dev
);
262 return sprintf(buf
, "%d\n", fls64(pdev
->dma_mask
));
264 static DEVICE_ATTR_RO(dma_mask_bits
);
266 static ssize_t
consistent_dma_mask_bits_show(struct device
*dev
,
267 struct device_attribute
*attr
,
270 return sprintf(buf
, "%d\n", fls64(dev
->coherent_dma_mask
));
272 static DEVICE_ATTR_RO(consistent_dma_mask_bits
);
274 static ssize_t
msi_bus_show(struct device
*dev
, struct device_attribute
*attr
,
277 struct pci_dev
*pdev
= to_pci_dev(dev
);
278 struct pci_bus
*subordinate
= pdev
->subordinate
;
280 return sprintf(buf
, "%u\n", subordinate
?
281 !(subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
)
285 static ssize_t
msi_bus_store(struct device
*dev
, struct device_attribute
*attr
,
286 const char *buf
, size_t count
)
288 struct pci_dev
*pdev
= to_pci_dev(dev
);
289 struct pci_bus
*subordinate
= pdev
->subordinate
;
292 if (kstrtoul(buf
, 0, &val
) < 0)
295 if (!capable(CAP_SYS_ADMIN
))
299 * "no_msi" and "bus_flags" only affect what happens when a driver
300 * requests MSI or MSI-X. They don't affect any drivers that have
301 * already requested MSI or MSI-X.
305 dev_info(&pdev
->dev
, "MSI/MSI-X %s for future drivers\n",
306 val
? "allowed" : "disallowed");
311 subordinate
->bus_flags
&= ~PCI_BUS_FLAGS_NO_MSI
;
313 subordinate
->bus_flags
|= PCI_BUS_FLAGS_NO_MSI
;
315 dev_info(&subordinate
->dev
, "MSI/MSI-X %s for future drivers of devices on this bus\n",
316 val
? "allowed" : "disallowed");
319 static DEVICE_ATTR_RW(msi_bus
);
321 static ssize_t
bus_rescan_store(struct bus_type
*bus
, const char *buf
,
325 struct pci_bus
*b
= NULL
;
327 if (kstrtoul(buf
, 0, &val
) < 0)
331 pci_lock_rescan_remove();
332 while ((b
= pci_find_next_bus(b
)) != NULL
)
334 pci_unlock_rescan_remove();
338 static BUS_ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, bus_rescan_store
);
340 static struct attribute
*pci_bus_attrs
[] = {
341 &bus_attr_rescan
.attr
,
345 static const struct attribute_group pci_bus_group
= {
346 .attrs
= pci_bus_attrs
,
349 const struct attribute_group
*pci_bus_groups
[] = {
354 static ssize_t
dev_rescan_store(struct device
*dev
,
355 struct device_attribute
*attr
, const char *buf
,
359 struct pci_dev
*pdev
= to_pci_dev(dev
);
361 if (kstrtoul(buf
, 0, &val
) < 0)
365 pci_lock_rescan_remove();
366 pci_rescan_bus(pdev
->bus
);
367 pci_unlock_rescan_remove();
371 static struct device_attribute dev_rescan_attr
= __ATTR(rescan
,
373 NULL
, dev_rescan_store
);
375 static ssize_t
remove_store(struct device
*dev
, struct device_attribute
*attr
,
376 const char *buf
, size_t count
)
380 if (kstrtoul(buf
, 0, &val
) < 0)
383 if (val
&& device_remove_file_self(dev
, attr
))
384 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev
));
387 static struct device_attribute dev_remove_attr
= __ATTR(remove
,
391 static ssize_t
dev_bus_rescan_store(struct device
*dev
,
392 struct device_attribute
*attr
,
393 const char *buf
, size_t count
)
396 struct pci_bus
*bus
= to_pci_bus(dev
);
398 if (kstrtoul(buf
, 0, &val
) < 0)
402 pci_lock_rescan_remove();
403 if (!pci_is_root_bus(bus
) && list_empty(&bus
->devices
))
404 pci_rescan_bus_bridge_resize(bus
->self
);
407 pci_unlock_rescan_remove();
411 static DEVICE_ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, dev_bus_rescan_store
);
413 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
414 static ssize_t
d3cold_allowed_store(struct device
*dev
,
415 struct device_attribute
*attr
,
416 const char *buf
, size_t count
)
418 struct pci_dev
*pdev
= to_pci_dev(dev
);
421 if (kstrtoul(buf
, 0, &val
) < 0)
424 pdev
->d3cold_allowed
= !!val
;
425 pm_runtime_resume(dev
);
430 static ssize_t
d3cold_allowed_show(struct device
*dev
,
431 struct device_attribute
*attr
, char *buf
)
433 struct pci_dev
*pdev
= to_pci_dev(dev
);
434 return sprintf(buf
, "%u\n", pdev
->d3cold_allowed
);
436 static DEVICE_ATTR_RW(d3cold_allowed
);
440 static ssize_t
devspec_show(struct device
*dev
,
441 struct device_attribute
*attr
, char *buf
)
443 struct pci_dev
*pdev
= to_pci_dev(dev
);
444 struct device_node
*np
= pci_device_to_OF_node(pdev
);
446 if (np
== NULL
|| np
->full_name
== NULL
)
448 return sprintf(buf
, "%s", np
->full_name
);
450 static DEVICE_ATTR_RO(devspec
);
453 #ifdef CONFIG_PCI_IOV
454 static ssize_t
sriov_totalvfs_show(struct device
*dev
,
455 struct device_attribute
*attr
,
458 struct pci_dev
*pdev
= to_pci_dev(dev
);
460 return sprintf(buf
, "%u\n", pci_sriov_get_totalvfs(pdev
));
464 static ssize_t
sriov_numvfs_show(struct device
*dev
,
465 struct device_attribute
*attr
,
468 struct pci_dev
*pdev
= to_pci_dev(dev
);
470 return sprintf(buf
, "%u\n", pdev
->sriov
->num_VFs
);
474 * num_vfs > 0; number of VFs to enable
475 * num_vfs = 0; disable all VFs
477 * Note: SRIOV spec doesn't allow partial VF
478 * disable, so it's all or none.
480 static ssize_t
sriov_numvfs_store(struct device
*dev
,
481 struct device_attribute
*attr
,
482 const char *buf
, size_t count
)
484 struct pci_dev
*pdev
= to_pci_dev(dev
);
488 ret
= kstrtou16(buf
, 0, &num_vfs
);
492 if (num_vfs
> pci_sriov_get_totalvfs(pdev
))
495 if (num_vfs
== pdev
->sriov
->num_VFs
)
496 return count
; /* no change */
498 /* is PF driver loaded w/callback */
499 if (!pdev
->driver
|| !pdev
->driver
->sriov_configure
) {
500 dev_info(&pdev
->dev
, "Driver doesn't support SRIOV configuration via sysfs\n");
506 ret
= pdev
->driver
->sriov_configure(pdev
, 0);
513 if (pdev
->sriov
->num_VFs
) {
514 dev_warn(&pdev
->dev
, "%d VFs already enabled. Disable before enabling %d VFs\n",
515 pdev
->sriov
->num_VFs
, num_vfs
);
519 ret
= pdev
->driver
->sriov_configure(pdev
, num_vfs
);
524 dev_warn(&pdev
->dev
, "%d VFs requested; only %d enabled\n",
530 static struct device_attribute sriov_totalvfs_attr
= __ATTR_RO(sriov_totalvfs
);
531 static struct device_attribute sriov_numvfs_attr
=
532 __ATTR(sriov_numvfs
, (S_IRUGO
|S_IWUSR
|S_IWGRP
),
533 sriov_numvfs_show
, sriov_numvfs_store
);
534 #endif /* CONFIG_PCI_IOV */
536 static ssize_t
driver_override_store(struct device
*dev
,
537 struct device_attribute
*attr
,
538 const char *buf
, size_t count
)
540 struct pci_dev
*pdev
= to_pci_dev(dev
);
541 char *driver_override
, *old
= pdev
->driver_override
, *cp
;
543 if (count
> PATH_MAX
)
546 driver_override
= kstrndup(buf
, count
, GFP_KERNEL
);
547 if (!driver_override
)
550 cp
= strchr(driver_override
, '\n');
554 if (strlen(driver_override
)) {
555 pdev
->driver_override
= driver_override
;
557 kfree(driver_override
);
558 pdev
->driver_override
= NULL
;
566 static ssize_t
driver_override_show(struct device
*dev
,
567 struct device_attribute
*attr
, char *buf
)
569 struct pci_dev
*pdev
= to_pci_dev(dev
);
571 return sprintf(buf
, "%s\n", pdev
->driver_override
);
573 static DEVICE_ATTR_RW(driver_override
);
575 static struct attribute
*pci_dev_attrs
[] = {
576 &dev_attr_resource
.attr
,
577 &dev_attr_vendor
.attr
,
578 &dev_attr_device
.attr
,
579 &dev_attr_subsystem_vendor
.attr
,
580 &dev_attr_subsystem_device
.attr
,
581 &dev_attr_class
.attr
,
583 &dev_attr_local_cpus
.attr
,
584 &dev_attr_local_cpulist
.attr
,
585 &dev_attr_modalias
.attr
,
587 &dev_attr_numa_node
.attr
,
589 &dev_attr_dma_mask_bits
.attr
,
590 &dev_attr_consistent_dma_mask_bits
.attr
,
591 &dev_attr_enable
.attr
,
592 &dev_attr_broken_parity_status
.attr
,
593 &dev_attr_msi_bus
.attr
,
594 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
595 &dev_attr_d3cold_allowed
.attr
,
598 &dev_attr_devspec
.attr
,
600 &dev_attr_driver_override
.attr
,
604 static const struct attribute_group pci_dev_group
= {
605 .attrs
= pci_dev_attrs
,
608 const struct attribute_group
*pci_dev_groups
[] = {
613 static struct attribute
*pcibus_attrs
[] = {
614 &dev_attr_rescan
.attr
,
615 &dev_attr_cpuaffinity
.attr
,
616 &dev_attr_cpulistaffinity
.attr
,
620 static const struct attribute_group pcibus_group
= {
621 .attrs
= pcibus_attrs
,
624 const struct attribute_group
*pcibus_groups
[] = {
629 static ssize_t
boot_vga_show(struct device
*dev
, struct device_attribute
*attr
,
632 struct pci_dev
*pdev
= to_pci_dev(dev
);
633 struct pci_dev
*vga_dev
= vga_default_device();
636 return sprintf(buf
, "%u\n", (pdev
== vga_dev
));
638 return sprintf(buf
, "%u\n",
639 !!(pdev
->resource
[PCI_ROM_RESOURCE
].flags
&
640 IORESOURCE_ROM_SHADOW
));
642 static struct device_attribute vga_attr
= __ATTR_RO(boot_vga
);
644 static ssize_t
pci_read_config(struct file
*filp
, struct kobject
*kobj
,
645 struct bin_attribute
*bin_attr
, char *buf
,
646 loff_t off
, size_t count
)
648 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
, struct device
,
650 unsigned int size
= 64;
651 loff_t init_off
= off
;
652 u8
*data
= (u8
*) buf
;
654 /* Several chips lock up trying to read undefined config space */
655 if (security_capable(filp
->f_cred
, &init_user_ns
, CAP_SYS_ADMIN
) == 0)
656 size
= dev
->cfg_size
;
657 else if (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
)
662 if (off
+ count
> size
) {
669 pci_config_pm_runtime_get(dev
);
671 if ((off
& 1) && size
) {
673 pci_user_read_config_byte(dev
, off
, &val
);
674 data
[off
- init_off
] = val
;
679 if ((off
& 3) && size
> 2) {
681 pci_user_read_config_word(dev
, off
, &val
);
682 data
[off
- init_off
] = val
& 0xff;
683 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
690 pci_user_read_config_dword(dev
, off
, &val
);
691 data
[off
- init_off
] = val
& 0xff;
692 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
693 data
[off
- init_off
+ 2] = (val
>> 16) & 0xff;
694 data
[off
- init_off
+ 3] = (val
>> 24) & 0xff;
701 pci_user_read_config_word(dev
, off
, &val
);
702 data
[off
- init_off
] = val
& 0xff;
703 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
710 pci_user_read_config_byte(dev
, off
, &val
);
711 data
[off
- init_off
] = val
;
716 pci_config_pm_runtime_put(dev
);
721 static ssize_t
pci_write_config(struct file
*filp
, struct kobject
*kobj
,
722 struct bin_attribute
*bin_attr
, char *buf
,
723 loff_t off
, size_t count
)
725 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
, struct device
,
727 unsigned int size
= count
;
728 loff_t init_off
= off
;
729 u8
*data
= (u8
*) buf
;
731 if (off
> dev
->cfg_size
)
733 if (off
+ count
> dev
->cfg_size
) {
734 size
= dev
->cfg_size
- off
;
738 pci_config_pm_runtime_get(dev
);
740 if ((off
& 1) && size
) {
741 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
746 if ((off
& 3) && size
> 2) {
747 u16 val
= data
[off
- init_off
];
748 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
749 pci_user_write_config_word(dev
, off
, val
);
755 u32 val
= data
[off
- init_off
];
756 val
|= (u32
) data
[off
- init_off
+ 1] << 8;
757 val
|= (u32
) data
[off
- init_off
+ 2] << 16;
758 val
|= (u32
) data
[off
- init_off
+ 3] << 24;
759 pci_user_write_config_dword(dev
, off
, val
);
765 u16 val
= data
[off
- init_off
];
766 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
767 pci_user_write_config_word(dev
, off
, val
);
773 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
778 pci_config_pm_runtime_put(dev
);
783 static ssize_t
read_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
784 struct bin_attribute
*bin_attr
, char *buf
,
785 loff_t off
, size_t count
)
787 struct pci_dev
*dev
=
788 to_pci_dev(container_of(kobj
, struct device
, kobj
));
790 if (off
> bin_attr
->size
)
792 else if (count
> bin_attr
->size
- off
)
793 count
= bin_attr
->size
- off
;
795 return pci_read_vpd(dev
, off
, count
, buf
);
798 static ssize_t
write_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
799 struct bin_attribute
*bin_attr
, char *buf
,
800 loff_t off
, size_t count
)
802 struct pci_dev
*dev
=
803 to_pci_dev(container_of(kobj
, struct device
, kobj
));
805 if (off
> bin_attr
->size
)
807 else if (count
> bin_attr
->size
- off
)
808 count
= bin_attr
->size
- off
;
810 return pci_write_vpd(dev
, off
, count
, buf
);
813 #ifdef HAVE_PCI_LEGACY
815 * pci_read_legacy_io - read byte(s) from legacy I/O port space
816 * @filp: open sysfs file
817 * @kobj: kobject corresponding to file to read from
818 * @bin_attr: struct bin_attribute for this file
819 * @buf: buffer to store results
820 * @off: offset into legacy I/O port space
821 * @count: number of bytes to read
823 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
824 * callback routine (pci_legacy_read).
826 static ssize_t
pci_read_legacy_io(struct file
*filp
, struct kobject
*kobj
,
827 struct bin_attribute
*bin_attr
, char *buf
,
828 loff_t off
, size_t count
)
830 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
833 /* Only support 1, 2 or 4 byte accesses */
834 if (count
!= 1 && count
!= 2 && count
!= 4)
837 return pci_legacy_read(bus
, off
, (u32
*)buf
, count
);
841 * pci_write_legacy_io - write byte(s) to legacy I/O port space
842 * @filp: open sysfs file
843 * @kobj: kobject corresponding to file to read from
844 * @bin_attr: struct bin_attribute for this file
845 * @buf: buffer containing value to be written
846 * @off: offset into legacy I/O port space
847 * @count: number of bytes to write
849 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
850 * callback routine (pci_legacy_write).
852 static ssize_t
pci_write_legacy_io(struct file
*filp
, struct kobject
*kobj
,
853 struct bin_attribute
*bin_attr
, char *buf
,
854 loff_t off
, size_t count
)
856 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
859 /* Only support 1, 2 or 4 byte accesses */
860 if (count
!= 1 && count
!= 2 && count
!= 4)
863 return pci_legacy_write(bus
, off
, *(u32
*)buf
, count
);
867 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
868 * @filp: open sysfs file
869 * @kobj: kobject corresponding to device to be mapped
870 * @attr: struct bin_attribute for this file
871 * @vma: struct vm_area_struct passed to mmap
873 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
874 * legacy memory space (first meg of bus space) into application virtual
877 static int pci_mmap_legacy_mem(struct file
*filp
, struct kobject
*kobj
,
878 struct bin_attribute
*attr
,
879 struct vm_area_struct
*vma
)
881 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
884 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_mem
);
888 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
889 * @filp: open sysfs file
890 * @kobj: kobject corresponding to device to be mapped
891 * @attr: struct bin_attribute for this file
892 * @vma: struct vm_area_struct passed to mmap
894 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
895 * legacy IO space (first meg of bus space) into application virtual
896 * memory space. Returns -ENOSYS if the operation isn't supported
898 static int pci_mmap_legacy_io(struct file
*filp
, struct kobject
*kobj
,
899 struct bin_attribute
*attr
,
900 struct vm_area_struct
*vma
)
902 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
905 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_io
);
909 * pci_adjust_legacy_attr - adjustment of legacy file attributes
910 * @b: bus to create files under
911 * @mmap_type: I/O port or memory
913 * Stub implementation. Can be overridden by arch if necessary.
915 void __weak
pci_adjust_legacy_attr(struct pci_bus
*b
,
916 enum pci_mmap_state mmap_type
)
921 * pci_create_legacy_files - create legacy I/O port and memory files
922 * @b: bus to create files under
924 * Some platforms allow access to legacy I/O port and ISA memory space on
925 * a per-bus basis. This routine creates the files and ties them into
926 * their associated read, write and mmap files from pci-sysfs.c
928 * On error unwind, but don't propagate the error to the caller
929 * as it is ok to set up the PCI bus without these files.
931 void pci_create_legacy_files(struct pci_bus
*b
)
935 b
->legacy_io
= kzalloc(sizeof(struct bin_attribute
) * 2,
940 sysfs_bin_attr_init(b
->legacy_io
);
941 b
->legacy_io
->attr
.name
= "legacy_io";
942 b
->legacy_io
->size
= 0xffff;
943 b
->legacy_io
->attr
.mode
= S_IRUSR
| S_IWUSR
;
944 b
->legacy_io
->read
= pci_read_legacy_io
;
945 b
->legacy_io
->write
= pci_write_legacy_io
;
946 b
->legacy_io
->mmap
= pci_mmap_legacy_io
;
947 pci_adjust_legacy_attr(b
, pci_mmap_io
);
948 error
= device_create_bin_file(&b
->dev
, b
->legacy_io
);
952 /* Allocated above after the legacy_io struct */
953 b
->legacy_mem
= b
->legacy_io
+ 1;
954 sysfs_bin_attr_init(b
->legacy_mem
);
955 b
->legacy_mem
->attr
.name
= "legacy_mem";
956 b
->legacy_mem
->size
= 1024*1024;
957 b
->legacy_mem
->attr
.mode
= S_IRUSR
| S_IWUSR
;
958 b
->legacy_mem
->mmap
= pci_mmap_legacy_mem
;
959 pci_adjust_legacy_attr(b
, pci_mmap_mem
);
960 error
= device_create_bin_file(&b
->dev
, b
->legacy_mem
);
967 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
972 printk(KERN_WARNING
"pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
976 void pci_remove_legacy_files(struct pci_bus
*b
)
979 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
980 device_remove_bin_file(&b
->dev
, b
->legacy_mem
);
981 kfree(b
->legacy_io
); /* both are allocated here */
984 #endif /* HAVE_PCI_LEGACY */
988 int pci_mmap_fits(struct pci_dev
*pdev
, int resno
, struct vm_area_struct
*vma
,
989 enum pci_mmap_api mmap_api
)
991 unsigned long nr
, start
, size
, pci_start
;
993 if (pci_resource_len(pdev
, resno
) == 0)
996 start
= vma
->vm_pgoff
;
997 size
= ((pci_resource_len(pdev
, resno
) - 1) >> PAGE_SHIFT
) + 1;
998 pci_start
= (mmap_api
== PCI_MMAP_PROCFS
) ?
999 pci_resource_start(pdev
, resno
) >> PAGE_SHIFT
: 0;
1000 if (start
>= pci_start
&& start
< pci_start
+ size
&&
1001 start
+ nr
<= pci_start
+ size
)
1007 * pci_mmap_resource - map a PCI resource into user memory space
1008 * @kobj: kobject for mapping
1009 * @attr: struct bin_attribute for the file being mapped
1010 * @vma: struct vm_area_struct passed into the mmap
1011 * @write_combine: 1 for write_combine mapping
1013 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1015 static int pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
1016 struct vm_area_struct
*vma
, int write_combine
)
1018 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
1019 struct device
, kobj
));
1020 struct resource
*res
= attr
->private;
1021 enum pci_mmap_state mmap_type
;
1022 resource_size_t start
, end
;
1025 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
1026 if (res
== &pdev
->resource
[i
])
1028 if (i
>= PCI_ROM_RESOURCE
)
1031 if (!pci_mmap_fits(pdev
, i
, vma
, PCI_MMAP_SYSFS
)) {
1032 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",
1033 current
->comm
, vma
->vm_end
-vma
->vm_start
, vma
->vm_pgoff
,
1035 (u64
)pci_resource_start(pdev
, i
),
1036 (u64
)pci_resource_len(pdev
, i
));
1040 /* pci_mmap_page_range() expects the same kind of entry as coming
1041 * from /proc/bus/pci/ which is a "user visible" value. If this is
1042 * different from the resource itself, arch will do necessary fixup.
1044 pci_resource_to_user(pdev
, i
, res
, &start
, &end
);
1045 vma
->vm_pgoff
+= start
>> PAGE_SHIFT
;
1046 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
1048 if (res
->flags
& IORESOURCE_MEM
&& iomem_is_exclusive(start
))
1051 return pci_mmap_page_range(pdev
, vma
, mmap_type
, write_combine
);
1054 static int pci_mmap_resource_uc(struct file
*filp
, struct kobject
*kobj
,
1055 struct bin_attribute
*attr
,
1056 struct vm_area_struct
*vma
)
1058 return pci_mmap_resource(kobj
, attr
, vma
, 0);
1061 static int pci_mmap_resource_wc(struct file
*filp
, struct kobject
*kobj
,
1062 struct bin_attribute
*attr
,
1063 struct vm_area_struct
*vma
)
1065 return pci_mmap_resource(kobj
, attr
, vma
, 1);
1068 static ssize_t
pci_resource_io(struct file
*filp
, struct kobject
*kobj
,
1069 struct bin_attribute
*attr
, char *buf
,
1070 loff_t off
, size_t count
, bool write
)
1072 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
1073 struct device
, kobj
));
1074 struct resource
*res
= attr
->private;
1075 unsigned long port
= off
;
1078 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
1079 if (res
== &pdev
->resource
[i
])
1081 if (i
>= PCI_ROM_RESOURCE
)
1084 port
+= pci_resource_start(pdev
, i
);
1086 if (port
> pci_resource_end(pdev
, i
))
1089 if (port
+ count
- 1 > pci_resource_end(pdev
, i
))
1095 outb(*(u8
*)buf
, port
);
1097 *(u8
*)buf
= inb(port
);
1101 outw(*(u16
*)buf
, port
);
1103 *(u16
*)buf
= inw(port
);
1107 outl(*(u32
*)buf
, port
);
1109 *(u32
*)buf
= inl(port
);
1115 static ssize_t
pci_read_resource_io(struct file
*filp
, struct kobject
*kobj
,
1116 struct bin_attribute
*attr
, char *buf
,
1117 loff_t off
, size_t count
)
1119 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, false);
1122 static ssize_t
pci_write_resource_io(struct file
*filp
, struct kobject
*kobj
,
1123 struct bin_attribute
*attr
, char *buf
,
1124 loff_t off
, size_t count
)
1126 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, true);
1130 * pci_remove_resource_files - cleanup resource files
1131 * @pdev: dev to cleanup
1133 * If we created resource files for @pdev, remove them from sysfs and
1134 * free their resources.
1136 static void pci_remove_resource_files(struct pci_dev
*pdev
)
1140 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1141 struct bin_attribute
*res_attr
;
1143 res_attr
= pdev
->res_attr
[i
];
1145 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1149 res_attr
= pdev
->res_attr_wc
[i
];
1151 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1157 static int pci_create_attr(struct pci_dev
*pdev
, int num
, int write_combine
)
1159 /* allocate attribute structure, piggyback attribute name */
1160 int name_len
= write_combine
? 13 : 10;
1161 struct bin_attribute
*res_attr
;
1164 res_attr
= kzalloc(sizeof(*res_attr
) + name_len
, GFP_ATOMIC
);
1166 char *res_attr_name
= (char *)(res_attr
+ 1);
1168 sysfs_bin_attr_init(res_attr
);
1169 if (write_combine
) {
1170 pdev
->res_attr_wc
[num
] = res_attr
;
1171 sprintf(res_attr_name
, "resource%d_wc", num
);
1172 res_attr
->mmap
= pci_mmap_resource_wc
;
1174 pdev
->res_attr
[num
] = res_attr
;
1175 sprintf(res_attr_name
, "resource%d", num
);
1176 res_attr
->mmap
= pci_mmap_resource_uc
;
1178 if (pci_resource_flags(pdev
, num
) & IORESOURCE_IO
) {
1179 res_attr
->read
= pci_read_resource_io
;
1180 res_attr
->write
= pci_write_resource_io
;
1182 res_attr
->attr
.name
= res_attr_name
;
1183 res_attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1184 res_attr
->size
= pci_resource_len(pdev
, num
);
1185 res_attr
->private = &pdev
->resource
[num
];
1186 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
1194 * pci_create_resource_files - create resource files in sysfs for @dev
1195 * @pdev: dev in question
1197 * Walk the resources in @pdev creating files for each resource available.
1199 static int pci_create_resource_files(struct pci_dev
*pdev
)
1204 /* Expose the PCI resources from this device as files */
1205 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1207 /* skip empty resources */
1208 if (!pci_resource_len(pdev
, i
))
1211 retval
= pci_create_attr(pdev
, i
, 0);
1212 /* for prefetchable resources, create a WC mappable file */
1213 if (!retval
&& pdev
->resource
[i
].flags
& IORESOURCE_PREFETCH
)
1214 retval
= pci_create_attr(pdev
, i
, 1);
1217 pci_remove_resource_files(pdev
);
1223 #else /* !HAVE_PCI_MMAP */
1224 int __weak
pci_create_resource_files(struct pci_dev
*dev
) { return 0; }
1225 void __weak
pci_remove_resource_files(struct pci_dev
*dev
) { return; }
1226 #endif /* HAVE_PCI_MMAP */
1229 * pci_write_rom - used to enable access to the PCI ROM display
1231 * @kobj: kernel object handle
1232 * @bin_attr: struct bin_attribute for this file
1235 * @count: number of byte in input
1237 * writing anything except 0 enables it
1239 static ssize_t
pci_write_rom(struct file
*filp
, struct kobject
*kobj
,
1240 struct bin_attribute
*bin_attr
, char *buf
,
1241 loff_t off
, size_t count
)
1243 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1245 if ((off
== 0) && (*buf
== '0') && (count
== 2))
1246 pdev
->rom_attr_enabled
= 0;
1248 pdev
->rom_attr_enabled
= 1;
1254 * pci_read_rom - read a PCI ROM
1256 * @kobj: kernel object handle
1257 * @bin_attr: struct bin_attribute for this file
1258 * @buf: where to put the data we read from the ROM
1260 * @count: number of bytes to read
1262 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1263 * device corresponding to @kobj.
1265 static ssize_t
pci_read_rom(struct file
*filp
, struct kobject
*kobj
,
1266 struct bin_attribute
*bin_attr
, char *buf
,
1267 loff_t off
, size_t count
)
1269 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1273 if (!pdev
->rom_attr_enabled
)
1276 rom
= pci_map_rom(pdev
, &size
); /* size starts out as PCI window size */
1283 if (off
+ count
> size
)
1286 memcpy_fromio(buf
, rom
+ off
, count
);
1288 pci_unmap_rom(pdev
, rom
);
1293 static struct bin_attribute pci_config_attr
= {
1296 .mode
= S_IRUGO
| S_IWUSR
,
1298 .size
= PCI_CFG_SPACE_SIZE
,
1299 .read
= pci_read_config
,
1300 .write
= pci_write_config
,
1303 static struct bin_attribute pcie_config_attr
= {
1306 .mode
= S_IRUGO
| S_IWUSR
,
1308 .size
= PCI_CFG_SPACE_EXP_SIZE
,
1309 .read
= pci_read_config
,
1310 .write
= pci_write_config
,
1313 static ssize_t
reset_store(struct device
*dev
, struct device_attribute
*attr
,
1314 const char *buf
, size_t count
)
1316 struct pci_dev
*pdev
= to_pci_dev(dev
);
1318 ssize_t result
= kstrtoul(buf
, 0, &val
);
1326 result
= pci_reset_function(pdev
);
1333 static struct device_attribute reset_attr
= __ATTR(reset
, 0200, NULL
, reset_store
);
1335 static int pci_create_capabilities_sysfs(struct pci_dev
*dev
)
1338 struct bin_attribute
*attr
;
1340 /* If the device has VPD, try to expose it in sysfs. */
1342 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1346 sysfs_bin_attr_init(attr
);
1347 attr
->size
= dev
->vpd
->len
;
1348 attr
->attr
.name
= "vpd";
1349 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1350 attr
->read
= read_vpd_attr
;
1351 attr
->write
= write_vpd_attr
;
1352 retval
= sysfs_create_bin_file(&dev
->dev
.kobj
, attr
);
1357 dev
->vpd
->attr
= attr
;
1360 /* Active State Power Management */
1361 pcie_aspm_create_sysfs_dev_files(dev
);
1363 if (!pci_probe_reset_function(dev
)) {
1364 retval
= device_create_file(&dev
->dev
, &reset_attr
);
1372 pcie_aspm_remove_sysfs_dev_files(dev
);
1373 if (dev
->vpd
&& dev
->vpd
->attr
) {
1374 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1375 kfree(dev
->vpd
->attr
);
1381 int __must_check
pci_create_sysfs_dev_files(struct pci_dev
*pdev
)
1385 struct bin_attribute
*attr
;
1387 if (!sysfs_initialized
)
1390 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1391 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1393 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1397 retval
= pci_create_resource_files(pdev
);
1399 goto err_config_file
;
1401 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1402 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1403 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1406 /* If the device has a ROM, try to expose it in sysfs. */
1408 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1411 goto err_resource_files
;
1413 sysfs_bin_attr_init(attr
);
1414 attr
->size
= rom_size
;
1415 attr
->attr
.name
= "rom";
1416 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1417 attr
->read
= pci_read_rom
;
1418 attr
->write
= pci_write_rom
;
1419 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, attr
);
1422 goto err_resource_files
;
1424 pdev
->rom_attr
= attr
;
1427 /* add sysfs entries for various capabilities */
1428 retval
= pci_create_capabilities_sysfs(pdev
);
1432 pci_create_firmware_label_files(pdev
);
1438 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1439 kfree(pdev
->rom_attr
);
1440 pdev
->rom_attr
= NULL
;
1443 pci_remove_resource_files(pdev
);
1445 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1446 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1448 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1453 static void pci_remove_capabilities_sysfs(struct pci_dev
*dev
)
1455 if (dev
->vpd
&& dev
->vpd
->attr
) {
1456 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1457 kfree(dev
->vpd
->attr
);
1460 pcie_aspm_remove_sysfs_dev_files(dev
);
1461 if (dev
->reset_fn
) {
1462 device_remove_file(&dev
->dev
, &reset_attr
);
1468 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1469 * @pdev: device whose entries we should free
1471 * Cleanup when @pdev is removed from sysfs.
1473 void pci_remove_sysfs_dev_files(struct pci_dev
*pdev
)
1477 if (!sysfs_initialized
)
1480 pci_remove_capabilities_sysfs(pdev
);
1482 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1483 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1485 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1487 pci_remove_resource_files(pdev
);
1489 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1490 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1491 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1494 if (rom_size
&& pdev
->rom_attr
) {
1495 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1496 kfree(pdev
->rom_attr
);
1499 pci_remove_firmware_label_files(pdev
);
1503 static int __init
pci_sysfs_init(void)
1505 struct pci_dev
*pdev
= NULL
;
1508 sysfs_initialized
= 1;
1509 for_each_pci_dev(pdev
) {
1510 retval
= pci_create_sysfs_dev_files(pdev
);
1519 late_initcall(pci_sysfs_init
);
1521 static struct attribute
*pci_dev_dev_attrs
[] = {
1526 static umode_t
pci_dev_attrs_are_visible(struct kobject
*kobj
,
1527 struct attribute
*a
, int n
)
1529 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1530 struct pci_dev
*pdev
= to_pci_dev(dev
);
1532 if (a
== &vga_attr
.attr
)
1533 if ((pdev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
1539 static struct attribute
*pci_dev_hp_attrs
[] = {
1540 &dev_remove_attr
.attr
,
1541 &dev_rescan_attr
.attr
,
1545 static umode_t
pci_dev_hp_attrs_are_visible(struct kobject
*kobj
,
1546 struct attribute
*a
, int n
)
1548 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1549 struct pci_dev
*pdev
= to_pci_dev(dev
);
1551 if (pdev
->is_virtfn
)
1557 static struct attribute_group pci_dev_hp_attr_group
= {
1558 .attrs
= pci_dev_hp_attrs
,
1559 .is_visible
= pci_dev_hp_attrs_are_visible
,
1562 #ifdef CONFIG_PCI_IOV
1563 static struct attribute
*sriov_dev_attrs
[] = {
1564 &sriov_totalvfs_attr
.attr
,
1565 &sriov_numvfs_attr
.attr
,
1569 static umode_t
sriov_attrs_are_visible(struct kobject
*kobj
,
1570 struct attribute
*a
, int n
)
1572 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1574 if (!dev_is_pf(dev
))
1580 static struct attribute_group sriov_dev_attr_group
= {
1581 .attrs
= sriov_dev_attrs
,
1582 .is_visible
= sriov_attrs_are_visible
,
1584 #endif /* CONFIG_PCI_IOV */
1586 static struct attribute_group pci_dev_attr_group
= {
1587 .attrs
= pci_dev_dev_attrs
,
1588 .is_visible
= pci_dev_attrs_are_visible
,
1591 static const struct attribute_group
*pci_dev_attr_groups
[] = {
1592 &pci_dev_attr_group
,
1593 &pci_dev_hp_attr_group
,
1594 #ifdef CONFIG_PCI_IOV
1595 &sriov_dev_attr_group
,
1600 struct device_type pci_dev_type
= {
1601 .groups
= pci_dev_attr_groups
,