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(revision
, "0x%02x\n");
54 pci_config_attr(class, "0x%06x\n");
55 pci_config_attr(irq
, "%u\n");
57 static ssize_t
broken_parity_status_show(struct device
*dev
,
58 struct device_attribute
*attr
,
61 struct pci_dev
*pdev
= to_pci_dev(dev
);
62 return sprintf(buf
, "%u\n", pdev
->broken_parity_status
);
65 static ssize_t
broken_parity_status_store(struct device
*dev
,
66 struct device_attribute
*attr
,
67 const char *buf
, size_t count
)
69 struct pci_dev
*pdev
= to_pci_dev(dev
);
72 if (kstrtoul(buf
, 0, &val
) < 0)
75 pdev
->broken_parity_status
= !!val
;
79 static DEVICE_ATTR_RW(broken_parity_status
);
81 static ssize_t
pci_dev_show_local_cpu(struct device
*dev
, bool list
,
82 struct device_attribute
*attr
, char *buf
)
84 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
);
92 return cpumap_print_to_pagebuf(list
, buf
, mask
);
95 static ssize_t
local_cpus_show(struct device
*dev
,
96 struct device_attribute
*attr
, char *buf
)
98 return pci_dev_show_local_cpu(dev
, false, attr
, buf
);
100 static DEVICE_ATTR_RO(local_cpus
);
102 static ssize_t
local_cpulist_show(struct device
*dev
,
103 struct device_attribute
*attr
, char *buf
)
105 return pci_dev_show_local_cpu(dev
, true, attr
, buf
);
107 static DEVICE_ATTR_RO(local_cpulist
);
110 * PCI Bus Class Devices
112 static ssize_t
cpuaffinity_show(struct device
*dev
,
113 struct device_attribute
*attr
, char *buf
)
115 const struct cpumask
*cpumask
= cpumask_of_pcibus(to_pci_bus(dev
));
117 return cpumap_print_to_pagebuf(false, buf
, cpumask
);
119 static DEVICE_ATTR_RO(cpuaffinity
);
121 static ssize_t
cpulistaffinity_show(struct device
*dev
,
122 struct device_attribute
*attr
, char *buf
)
124 const struct cpumask
*cpumask
= cpumask_of_pcibus(to_pci_bus(dev
));
126 return cpumap_print_to_pagebuf(true, buf
, cpumask
);
128 static DEVICE_ATTR_RO(cpulistaffinity
);
131 static ssize_t
resource_show(struct device
*dev
, struct device_attribute
*attr
,
134 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
138 resource_size_t start
, end
;
140 if (pci_dev
->subordinate
)
141 max
= DEVICE_COUNT_RESOURCE
;
143 max
= PCI_BRIDGE_RESOURCES
;
145 for (i
= 0; i
< max
; i
++) {
146 struct resource
*res
= &pci_dev
->resource
[i
];
147 pci_resource_to_user(pci_dev
, i
, res
, &start
, &end
);
148 str
+= sprintf(str
, "0x%016llx 0x%016llx 0x%016llx\n",
149 (unsigned long long)start
,
150 (unsigned long long)end
,
151 (unsigned long long)res
->flags
);
155 static DEVICE_ATTR_RO(resource
);
157 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*attr
,
160 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
162 return sprintf(buf
, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
163 pci_dev
->vendor
, pci_dev
->device
,
164 pci_dev
->subsystem_vendor
, pci_dev
->subsystem_device
,
165 (u8
)(pci_dev
->class >> 16), (u8
)(pci_dev
->class >> 8),
166 (u8
)(pci_dev
->class));
168 static DEVICE_ATTR_RO(modalias
);
170 static ssize_t
enable_store(struct device
*dev
, struct device_attribute
*attr
,
171 const char *buf
, size_t count
)
173 struct pci_dev
*pdev
= to_pci_dev(dev
);
175 ssize_t result
= kstrtoul(buf
, 0, &val
);
180 /* this can crash the machine when done on the "wrong" device */
181 if (!capable(CAP_SYS_ADMIN
))
185 if (pci_is_enabled(pdev
))
186 pci_disable_device(pdev
);
190 result
= pci_enable_device(pdev
);
192 return result
< 0 ? result
: count
;
195 static ssize_t
enable_show(struct device
*dev
, struct device_attribute
*attr
,
198 struct pci_dev
*pdev
;
200 pdev
= to_pci_dev(dev
);
201 return sprintf(buf
, "%u\n", atomic_read(&pdev
->enable_cnt
));
203 static DEVICE_ATTR_RW(enable
);
206 static ssize_t
numa_node_store(struct device
*dev
,
207 struct device_attribute
*attr
, const char *buf
,
210 struct pci_dev
*pdev
= to_pci_dev(dev
);
213 if (!capable(CAP_SYS_ADMIN
))
216 ret
= kstrtoint(buf
, 0, &node
);
220 if ((node
< 0 && node
!= NUMA_NO_NODE
) || node
>= MAX_NUMNODES
)
223 if (node
!= NUMA_NO_NODE
&& !node_online(node
))
226 add_taint(TAINT_FIRMWARE_WORKAROUND
, LOCKDEP_STILL_OK
);
227 dev_alert(&pdev
->dev
, FW_BUG
"Overriding NUMA node to %d. Contact your vendor for updates.",
230 dev
->numa_node
= node
;
234 static ssize_t
numa_node_show(struct device
*dev
, struct device_attribute
*attr
,
237 return sprintf(buf
, "%d\n", dev
->numa_node
);
239 static DEVICE_ATTR_RW(numa_node
);
242 static ssize_t
dma_mask_bits_show(struct device
*dev
,
243 struct device_attribute
*attr
, char *buf
)
245 struct pci_dev
*pdev
= to_pci_dev(dev
);
247 return sprintf(buf
, "%d\n", fls64(pdev
->dma_mask
));
249 static DEVICE_ATTR_RO(dma_mask_bits
);
251 static ssize_t
consistent_dma_mask_bits_show(struct device
*dev
,
252 struct device_attribute
*attr
,
255 return sprintf(buf
, "%d\n", fls64(dev
->coherent_dma_mask
));
257 static DEVICE_ATTR_RO(consistent_dma_mask_bits
);
259 static ssize_t
msi_bus_show(struct device
*dev
, struct device_attribute
*attr
,
262 struct pci_dev
*pdev
= to_pci_dev(dev
);
263 struct pci_bus
*subordinate
= pdev
->subordinate
;
265 return sprintf(buf
, "%u\n", subordinate
?
266 !(subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
)
270 static ssize_t
msi_bus_store(struct device
*dev
, struct device_attribute
*attr
,
271 const char *buf
, size_t count
)
273 struct pci_dev
*pdev
= to_pci_dev(dev
);
274 struct pci_bus
*subordinate
= pdev
->subordinate
;
277 if (kstrtoul(buf
, 0, &val
) < 0)
280 if (!capable(CAP_SYS_ADMIN
))
284 * "no_msi" and "bus_flags" only affect what happens when a driver
285 * requests MSI or MSI-X. They don't affect any drivers that have
286 * already requested MSI or MSI-X.
290 dev_info(&pdev
->dev
, "MSI/MSI-X %s for future drivers\n",
291 val
? "allowed" : "disallowed");
296 subordinate
->bus_flags
&= ~PCI_BUS_FLAGS_NO_MSI
;
298 subordinate
->bus_flags
|= PCI_BUS_FLAGS_NO_MSI
;
300 dev_info(&subordinate
->dev
, "MSI/MSI-X %s for future drivers of devices on this bus\n",
301 val
? "allowed" : "disallowed");
304 static DEVICE_ATTR_RW(msi_bus
);
306 static ssize_t
bus_rescan_store(struct bus_type
*bus
, const char *buf
,
310 struct pci_bus
*b
= NULL
;
312 if (kstrtoul(buf
, 0, &val
) < 0)
316 pci_lock_rescan_remove();
317 while ((b
= pci_find_next_bus(b
)) != NULL
)
319 pci_unlock_rescan_remove();
323 static BUS_ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, bus_rescan_store
);
325 static struct attribute
*pci_bus_attrs
[] = {
326 &bus_attr_rescan
.attr
,
330 static const struct attribute_group pci_bus_group
= {
331 .attrs
= pci_bus_attrs
,
334 const struct attribute_group
*pci_bus_groups
[] = {
339 static ssize_t
dev_rescan_store(struct device
*dev
,
340 struct device_attribute
*attr
, const char *buf
,
344 struct pci_dev
*pdev
= to_pci_dev(dev
);
346 if (kstrtoul(buf
, 0, &val
) < 0)
350 pci_lock_rescan_remove();
351 pci_rescan_bus(pdev
->bus
);
352 pci_unlock_rescan_remove();
356 static struct device_attribute dev_rescan_attr
= __ATTR(rescan
,
358 NULL
, dev_rescan_store
);
360 static ssize_t
remove_store(struct device
*dev
, struct device_attribute
*attr
,
361 const char *buf
, size_t count
)
365 if (kstrtoul(buf
, 0, &val
) < 0)
368 if (val
&& device_remove_file_self(dev
, attr
))
369 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev
));
372 static struct device_attribute dev_remove_attr
= __ATTR(remove
,
376 static ssize_t
dev_bus_rescan_store(struct device
*dev
,
377 struct device_attribute
*attr
,
378 const char *buf
, size_t count
)
381 struct pci_bus
*bus
= to_pci_bus(dev
);
383 if (kstrtoul(buf
, 0, &val
) < 0)
387 pci_lock_rescan_remove();
388 if (!pci_is_root_bus(bus
) && list_empty(&bus
->devices
))
389 pci_rescan_bus_bridge_resize(bus
->self
);
392 pci_unlock_rescan_remove();
396 static DEVICE_ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, dev_bus_rescan_store
);
398 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
399 static ssize_t
d3cold_allowed_store(struct device
*dev
,
400 struct device_attribute
*attr
,
401 const char *buf
, size_t count
)
403 struct pci_dev
*pdev
= to_pci_dev(dev
);
406 if (kstrtoul(buf
, 0, &val
) < 0)
409 pdev
->d3cold_allowed
= !!val
;
410 if (pdev
->d3cold_allowed
)
411 pci_d3cold_enable(pdev
);
413 pci_d3cold_disable(pdev
);
415 pm_runtime_resume(dev
);
420 static ssize_t
d3cold_allowed_show(struct device
*dev
,
421 struct device_attribute
*attr
, char *buf
)
423 struct pci_dev
*pdev
= to_pci_dev(dev
);
424 return sprintf(buf
, "%u\n", pdev
->d3cold_allowed
);
426 static DEVICE_ATTR_RW(d3cold_allowed
);
430 static ssize_t
devspec_show(struct device
*dev
,
431 struct device_attribute
*attr
, char *buf
)
433 struct pci_dev
*pdev
= to_pci_dev(dev
);
434 struct device_node
*np
= pci_device_to_OF_node(pdev
);
436 if (np
== NULL
|| np
->full_name
== NULL
)
438 return sprintf(buf
, "%s", np
->full_name
);
440 static DEVICE_ATTR_RO(devspec
);
443 #ifdef CONFIG_PCI_IOV
444 static ssize_t
sriov_totalvfs_show(struct device
*dev
,
445 struct device_attribute
*attr
,
448 struct pci_dev
*pdev
= to_pci_dev(dev
);
450 return sprintf(buf
, "%u\n", pci_sriov_get_totalvfs(pdev
));
454 static ssize_t
sriov_numvfs_show(struct device
*dev
,
455 struct device_attribute
*attr
,
458 struct pci_dev
*pdev
= to_pci_dev(dev
);
460 return sprintf(buf
, "%u\n", pdev
->sriov
->num_VFs
);
464 * num_vfs > 0; number of VFs to enable
465 * num_vfs = 0; disable all VFs
467 * Note: SRIOV spec doesn't allow partial VF
468 * disable, so it's all or none.
470 static ssize_t
sriov_numvfs_store(struct device
*dev
,
471 struct device_attribute
*attr
,
472 const char *buf
, size_t count
)
474 struct pci_dev
*pdev
= to_pci_dev(dev
);
475 struct pci_sriov
*iov
= pdev
->sriov
;
479 ret
= kstrtou16(buf
, 0, &num_vfs
);
483 if (num_vfs
> pci_sriov_get_totalvfs(pdev
))
486 mutex_lock(&iov
->dev
->sriov
->lock
);
488 if (num_vfs
== pdev
->sriov
->num_VFs
)
491 /* is PF driver loaded w/callback */
492 if (!pdev
->driver
|| !pdev
->driver
->sriov_configure
) {
493 dev_info(&pdev
->dev
, "Driver doesn't support SRIOV configuration via sysfs\n");
500 ret
= pdev
->driver
->sriov_configure(pdev
, 0);
505 if (pdev
->sriov
->num_VFs
) {
506 dev_warn(&pdev
->dev
, "%d VFs already enabled. Disable before enabling %d VFs\n",
507 pdev
->sriov
->num_VFs
, num_vfs
);
512 ret
= pdev
->driver
->sriov_configure(pdev
, num_vfs
);
517 dev_warn(&pdev
->dev
, "%d VFs requested; only %d enabled\n",
521 mutex_unlock(&iov
->dev
->sriov
->lock
);
529 static struct device_attribute sriov_totalvfs_attr
= __ATTR_RO(sriov_totalvfs
);
530 static struct device_attribute sriov_numvfs_attr
=
531 __ATTR(sriov_numvfs
, (S_IRUGO
|S_IWUSR
|S_IWGRP
),
532 sriov_numvfs_show
, sriov_numvfs_store
);
533 #endif /* CONFIG_PCI_IOV */
535 static ssize_t
driver_override_store(struct device
*dev
,
536 struct device_attribute
*attr
,
537 const char *buf
, size_t count
)
539 struct pci_dev
*pdev
= to_pci_dev(dev
);
540 char *driver_override
, *old
= pdev
->driver_override
, *cp
;
542 /* We need to keep extra room for a newline */
543 if (count
>= (PAGE_SIZE
- 1))
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 snprintf(buf
, PAGE_SIZE
, "%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_revision
.attr
,
582 &dev_attr_class
.attr
,
584 &dev_attr_local_cpus
.attr
,
585 &dev_attr_local_cpulist
.attr
,
586 &dev_attr_modalias
.attr
,
588 &dev_attr_numa_node
.attr
,
590 &dev_attr_dma_mask_bits
.attr
,
591 &dev_attr_consistent_dma_mask_bits
.attr
,
592 &dev_attr_enable
.attr
,
593 &dev_attr_broken_parity_status
.attr
,
594 &dev_attr_msi_bus
.attr
,
595 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
596 &dev_attr_d3cold_allowed
.attr
,
599 &dev_attr_devspec
.attr
,
601 &dev_attr_driver_override
.attr
,
605 static const struct attribute_group pci_dev_group
= {
606 .attrs
= pci_dev_attrs
,
609 const struct attribute_group
*pci_dev_groups
[] = {
614 static struct attribute
*pcibus_attrs
[] = {
615 &dev_attr_rescan
.attr
,
616 &dev_attr_cpuaffinity
.attr
,
617 &dev_attr_cpulistaffinity
.attr
,
621 static const struct attribute_group pcibus_group
= {
622 .attrs
= pcibus_attrs
,
625 const struct attribute_group
*pcibus_groups
[] = {
630 static ssize_t
boot_vga_show(struct device
*dev
, struct device_attribute
*attr
,
633 struct pci_dev
*pdev
= to_pci_dev(dev
);
634 struct pci_dev
*vga_dev
= vga_default_device();
637 return sprintf(buf
, "%u\n", (pdev
== vga_dev
));
639 return sprintf(buf
, "%u\n",
640 !!(pdev
->resource
[PCI_ROM_RESOURCE
].flags
&
641 IORESOURCE_ROM_SHADOW
));
643 static struct device_attribute vga_attr
= __ATTR_RO(boot_vga
);
645 static ssize_t
pci_read_config(struct file
*filp
, struct kobject
*kobj
,
646 struct bin_attribute
*bin_attr
, char *buf
,
647 loff_t off
, size_t count
)
649 struct pci_dev
*dev
= to_pci_dev(kobj_to_dev(kobj
));
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 (file_ns_capable(filp
, &init_user_ns
, CAP_SYS_ADMIN
))
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(kobj_to_dev(kobj
));
726 unsigned int size
= count
;
727 loff_t init_off
= off
;
728 u8
*data
= (u8
*) buf
;
730 if (off
> dev
->cfg_size
)
732 if (off
+ count
> dev
->cfg_size
) {
733 size
= dev
->cfg_size
- off
;
737 pci_config_pm_runtime_get(dev
);
739 if ((off
& 1) && size
) {
740 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
745 if ((off
& 3) && size
> 2) {
746 u16 val
= data
[off
- init_off
];
747 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
748 pci_user_write_config_word(dev
, off
, val
);
754 u32 val
= data
[off
- init_off
];
755 val
|= (u32
) data
[off
- init_off
+ 1] << 8;
756 val
|= (u32
) data
[off
- init_off
+ 2] << 16;
757 val
|= (u32
) data
[off
- init_off
+ 3] << 24;
758 pci_user_write_config_dword(dev
, off
, val
);
764 u16 val
= data
[off
- init_off
];
765 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
766 pci_user_write_config_word(dev
, off
, val
);
772 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
777 pci_config_pm_runtime_put(dev
);
782 static ssize_t
read_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
783 struct bin_attribute
*bin_attr
, char *buf
,
784 loff_t off
, size_t count
)
786 struct pci_dev
*dev
= to_pci_dev(kobj_to_dev(kobj
));
788 if (bin_attr
->size
> 0) {
789 if (off
> bin_attr
->size
)
791 else if (count
> bin_attr
->size
- off
)
792 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
= to_pci_dev(kobj_to_dev(kobj
));
804 if (bin_attr
->size
> 0) {
805 if (off
> bin_attr
->size
)
807 else if (count
> bin_attr
->size
- off
)
808 count
= bin_attr
->size
- off
;
811 return pci_write_vpd(dev
, off
, count
, buf
);
814 #ifdef HAVE_PCI_LEGACY
816 * pci_read_legacy_io - read byte(s) from 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 to store results
821 * @off: offset into legacy I/O port space
822 * @count: number of bytes to read
824 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
825 * callback routine (pci_legacy_read).
827 static ssize_t
pci_read_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(kobj_to_dev(kobj
));
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(kobj_to_dev(kobj
));
858 /* Only support 1, 2 or 4 byte accesses */
859 if (count
!= 1 && count
!= 2 && count
!= 4)
862 return pci_legacy_write(bus
, off
, *(u32
*)buf
, count
);
866 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
867 * @filp: open sysfs file
868 * @kobj: kobject corresponding to device to be mapped
869 * @attr: struct bin_attribute for this file
870 * @vma: struct vm_area_struct passed to mmap
872 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
873 * legacy memory space (first meg of bus space) into application virtual
876 static int pci_mmap_legacy_mem(struct file
*filp
, struct kobject
*kobj
,
877 struct bin_attribute
*attr
,
878 struct vm_area_struct
*vma
)
880 struct pci_bus
*bus
= to_pci_bus(kobj_to_dev(kobj
));
882 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_mem
);
886 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
887 * @filp: open sysfs file
888 * @kobj: kobject corresponding to device to be mapped
889 * @attr: struct bin_attribute for this file
890 * @vma: struct vm_area_struct passed to mmap
892 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
893 * legacy IO space (first meg of bus space) into application virtual
894 * memory space. Returns -ENOSYS if the operation isn't supported
896 static int pci_mmap_legacy_io(struct file
*filp
, struct kobject
*kobj
,
897 struct bin_attribute
*attr
,
898 struct vm_area_struct
*vma
)
900 struct pci_bus
*bus
= to_pci_bus(kobj_to_dev(kobj
));
902 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_io
);
906 * pci_adjust_legacy_attr - adjustment of legacy file attributes
907 * @b: bus to create files under
908 * @mmap_type: I/O port or memory
910 * Stub implementation. Can be overridden by arch if necessary.
912 void __weak
pci_adjust_legacy_attr(struct pci_bus
*b
,
913 enum pci_mmap_state mmap_type
)
918 * pci_create_legacy_files - create legacy I/O port and memory files
919 * @b: bus to create files under
921 * Some platforms allow access to legacy I/O port and ISA memory space on
922 * a per-bus basis. This routine creates the files and ties them into
923 * their associated read, write and mmap files from pci-sysfs.c
925 * On error unwind, but don't propagate the error to the caller
926 * as it is ok to set up the PCI bus without these files.
928 void pci_create_legacy_files(struct pci_bus
*b
)
932 b
->legacy_io
= kzalloc(sizeof(struct bin_attribute
) * 2,
937 sysfs_bin_attr_init(b
->legacy_io
);
938 b
->legacy_io
->attr
.name
= "legacy_io";
939 b
->legacy_io
->size
= 0xffff;
940 b
->legacy_io
->attr
.mode
= S_IRUSR
| S_IWUSR
;
941 b
->legacy_io
->read
= pci_read_legacy_io
;
942 b
->legacy_io
->write
= pci_write_legacy_io
;
943 b
->legacy_io
->mmap
= pci_mmap_legacy_io
;
944 pci_adjust_legacy_attr(b
, pci_mmap_io
);
945 error
= device_create_bin_file(&b
->dev
, b
->legacy_io
);
949 /* Allocated above after the legacy_io struct */
950 b
->legacy_mem
= b
->legacy_io
+ 1;
951 sysfs_bin_attr_init(b
->legacy_mem
);
952 b
->legacy_mem
->attr
.name
= "legacy_mem";
953 b
->legacy_mem
->size
= 1024*1024;
954 b
->legacy_mem
->attr
.mode
= S_IRUSR
| S_IWUSR
;
955 b
->legacy_mem
->mmap
= pci_mmap_legacy_mem
;
956 pci_adjust_legacy_attr(b
, pci_mmap_mem
);
957 error
= device_create_bin_file(&b
->dev
, b
->legacy_mem
);
964 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
969 printk(KERN_WARNING
"pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
973 void pci_remove_legacy_files(struct pci_bus
*b
)
976 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
977 device_remove_bin_file(&b
->dev
, b
->legacy_mem
);
978 kfree(b
->legacy_io
); /* both are allocated here */
981 #endif /* HAVE_PCI_LEGACY */
985 int pci_mmap_fits(struct pci_dev
*pdev
, int resno
, struct vm_area_struct
*vma
,
986 enum pci_mmap_api mmap_api
)
988 unsigned long nr
, start
, size
, pci_start
;
990 if (pci_resource_len(pdev
, resno
) == 0)
993 start
= vma
->vm_pgoff
;
994 size
= ((pci_resource_len(pdev
, resno
) - 1) >> PAGE_SHIFT
) + 1;
995 pci_start
= (mmap_api
== PCI_MMAP_PROCFS
) ?
996 pci_resource_start(pdev
, resno
) >> PAGE_SHIFT
: 0;
997 if (start
>= pci_start
&& start
< pci_start
+ size
&&
998 start
+ nr
<= pci_start
+ size
)
1004 * pci_mmap_resource - map a PCI resource into user memory space
1005 * @kobj: kobject for mapping
1006 * @attr: struct bin_attribute for the file being mapped
1007 * @vma: struct vm_area_struct passed into the mmap
1008 * @write_combine: 1 for write_combine mapping
1010 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1012 static int pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
1013 struct vm_area_struct
*vma
, int write_combine
)
1015 struct pci_dev
*pdev
= to_pci_dev(kobj_to_dev(kobj
));
1016 struct resource
*res
= attr
->private;
1017 enum pci_mmap_state mmap_type
;
1018 resource_size_t start
, end
;
1021 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
1022 if (res
== &pdev
->resource
[i
])
1024 if (i
>= PCI_ROM_RESOURCE
)
1027 if (res
->flags
& IORESOURCE_MEM
&& iomem_is_exclusive(res
->start
))
1030 if (!pci_mmap_fits(pdev
, i
, vma
, PCI_MMAP_SYSFS
)) {
1031 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",
1032 current
->comm
, vma
->vm_end
-vma
->vm_start
, vma
->vm_pgoff
,
1034 (u64
)pci_resource_start(pdev
, i
),
1035 (u64
)pci_resource_len(pdev
, i
));
1039 /* pci_mmap_page_range() expects the same kind of entry as coming
1040 * from /proc/bus/pci/ which is a "user visible" value. If this is
1041 * different from the resource itself, arch will do necessary fixup.
1043 pci_resource_to_user(pdev
, i
, res
, &start
, &end
);
1044 vma
->vm_pgoff
+= start
>> PAGE_SHIFT
;
1045 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
1046 return pci_mmap_page_range(pdev
, vma
, mmap_type
, write_combine
);
1049 static int pci_mmap_resource_uc(struct file
*filp
, struct kobject
*kobj
,
1050 struct bin_attribute
*attr
,
1051 struct vm_area_struct
*vma
)
1053 return pci_mmap_resource(kobj
, attr
, vma
, 0);
1056 static int pci_mmap_resource_wc(struct file
*filp
, struct kobject
*kobj
,
1057 struct bin_attribute
*attr
,
1058 struct vm_area_struct
*vma
)
1060 return pci_mmap_resource(kobj
, attr
, vma
, 1);
1063 static ssize_t
pci_resource_io(struct file
*filp
, struct kobject
*kobj
,
1064 struct bin_attribute
*attr
, char *buf
,
1065 loff_t off
, size_t count
, bool write
)
1067 struct pci_dev
*pdev
= to_pci_dev(kobj_to_dev(kobj
));
1068 struct resource
*res
= attr
->private;
1069 unsigned long port
= off
;
1072 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
1073 if (res
== &pdev
->resource
[i
])
1075 if (i
>= PCI_ROM_RESOURCE
)
1078 port
+= pci_resource_start(pdev
, i
);
1080 if (port
> pci_resource_end(pdev
, i
))
1083 if (port
+ count
- 1 > pci_resource_end(pdev
, i
))
1089 outb(*(u8
*)buf
, port
);
1091 *(u8
*)buf
= inb(port
);
1095 outw(*(u16
*)buf
, port
);
1097 *(u16
*)buf
= inw(port
);
1101 outl(*(u32
*)buf
, port
);
1103 *(u32
*)buf
= inl(port
);
1109 static ssize_t
pci_read_resource_io(struct file
*filp
, struct kobject
*kobj
,
1110 struct bin_attribute
*attr
, char *buf
,
1111 loff_t off
, size_t count
)
1113 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, false);
1116 static ssize_t
pci_write_resource_io(struct file
*filp
, struct kobject
*kobj
,
1117 struct bin_attribute
*attr
, char *buf
,
1118 loff_t off
, size_t count
)
1120 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, true);
1124 * pci_remove_resource_files - cleanup resource files
1125 * @pdev: dev to cleanup
1127 * If we created resource files for @pdev, remove them from sysfs and
1128 * free their resources.
1130 static void pci_remove_resource_files(struct pci_dev
*pdev
)
1134 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1135 struct bin_attribute
*res_attr
;
1137 res_attr
= pdev
->res_attr
[i
];
1139 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1143 res_attr
= pdev
->res_attr_wc
[i
];
1145 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1151 static int pci_create_attr(struct pci_dev
*pdev
, int num
, int write_combine
)
1153 /* allocate attribute structure, piggyback attribute name */
1154 int name_len
= write_combine
? 13 : 10;
1155 struct bin_attribute
*res_attr
;
1156 char *res_attr_name
;
1159 res_attr
= kzalloc(sizeof(*res_attr
) + name_len
, GFP_ATOMIC
);
1163 res_attr_name
= (char *)(res_attr
+ 1);
1165 sysfs_bin_attr_init(res_attr
);
1166 if (write_combine
) {
1167 pdev
->res_attr_wc
[num
] = res_attr
;
1168 sprintf(res_attr_name
, "resource%d_wc", num
);
1169 res_attr
->mmap
= pci_mmap_resource_wc
;
1171 pdev
->res_attr
[num
] = res_attr
;
1172 sprintf(res_attr_name
, "resource%d", num
);
1173 res_attr
->mmap
= pci_mmap_resource_uc
;
1175 if (pci_resource_flags(pdev
, num
) & IORESOURCE_IO
) {
1176 res_attr
->read
= pci_read_resource_io
;
1177 res_attr
->write
= pci_write_resource_io
;
1179 res_attr
->attr
.name
= res_attr_name
;
1180 res_attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1181 res_attr
->size
= pci_resource_len(pdev
, num
);
1182 res_attr
->private = &pdev
->resource
[num
];
1183 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
1191 * pci_create_resource_files - create resource files in sysfs for @dev
1192 * @pdev: dev in question
1194 * Walk the resources in @pdev creating files for each resource available.
1196 static int pci_create_resource_files(struct pci_dev
*pdev
)
1201 /* Expose the PCI resources from this device as files */
1202 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1204 /* skip empty resources */
1205 if (!pci_resource_len(pdev
, i
))
1208 retval
= pci_create_attr(pdev
, i
, 0);
1209 /* for prefetchable resources, create a WC mappable file */
1210 if (!retval
&& pdev
->resource
[i
].flags
& IORESOURCE_PREFETCH
)
1211 retval
= pci_create_attr(pdev
, i
, 1);
1214 pci_remove_resource_files(pdev
);
1220 #else /* !HAVE_PCI_MMAP */
1221 int __weak
pci_create_resource_files(struct pci_dev
*dev
) { return 0; }
1222 void __weak
pci_remove_resource_files(struct pci_dev
*dev
) { return; }
1223 #endif /* HAVE_PCI_MMAP */
1226 * pci_write_rom - used to enable access to the PCI ROM display
1228 * @kobj: kernel object handle
1229 * @bin_attr: struct bin_attribute for this file
1232 * @count: number of byte in input
1234 * writing anything except 0 enables it
1236 static ssize_t
pci_write_rom(struct file
*filp
, struct kobject
*kobj
,
1237 struct bin_attribute
*bin_attr
, char *buf
,
1238 loff_t off
, size_t count
)
1240 struct pci_dev
*pdev
= to_pci_dev(kobj_to_dev(kobj
));
1242 if ((off
== 0) && (*buf
== '0') && (count
== 2))
1243 pdev
->rom_attr_enabled
= 0;
1245 pdev
->rom_attr_enabled
= 1;
1251 * pci_read_rom - read a PCI ROM
1253 * @kobj: kernel object handle
1254 * @bin_attr: struct bin_attribute for this file
1255 * @buf: where to put the data we read from the ROM
1257 * @count: number of bytes to read
1259 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1260 * device corresponding to @kobj.
1262 static ssize_t
pci_read_rom(struct file
*filp
, struct kobject
*kobj
,
1263 struct bin_attribute
*bin_attr
, char *buf
,
1264 loff_t off
, size_t count
)
1266 struct pci_dev
*pdev
= to_pci_dev(kobj_to_dev(kobj
));
1270 if (!pdev
->rom_attr_enabled
)
1273 rom
= pci_map_rom(pdev
, &size
); /* size starts out as PCI window size */
1280 if (off
+ count
> size
)
1283 memcpy_fromio(buf
, rom
+ off
, count
);
1285 pci_unmap_rom(pdev
, rom
);
1290 static struct bin_attribute pci_config_attr
= {
1293 .mode
= S_IRUGO
| S_IWUSR
,
1295 .size
= PCI_CFG_SPACE_SIZE
,
1296 .read
= pci_read_config
,
1297 .write
= pci_write_config
,
1300 static struct bin_attribute pcie_config_attr
= {
1303 .mode
= S_IRUGO
| S_IWUSR
,
1305 .size
= PCI_CFG_SPACE_EXP_SIZE
,
1306 .read
= pci_read_config
,
1307 .write
= pci_write_config
,
1310 static ssize_t
reset_store(struct device
*dev
, struct device_attribute
*attr
,
1311 const char *buf
, size_t count
)
1313 struct pci_dev
*pdev
= to_pci_dev(dev
);
1315 ssize_t result
= kstrtoul(buf
, 0, &val
);
1323 result
= pci_reset_function(pdev
);
1330 static struct device_attribute reset_attr
= __ATTR(reset
, 0200, NULL
, reset_store
);
1332 static int pci_create_capabilities_sysfs(struct pci_dev
*dev
)
1335 struct bin_attribute
*attr
;
1337 /* If the device has VPD, try to expose it in sysfs. */
1339 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1343 sysfs_bin_attr_init(attr
);
1345 attr
->attr
.name
= "vpd";
1346 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1347 attr
->read
= read_vpd_attr
;
1348 attr
->write
= write_vpd_attr
;
1349 retval
= sysfs_create_bin_file(&dev
->dev
.kobj
, attr
);
1354 dev
->vpd
->attr
= attr
;
1357 /* Active State Power Management */
1358 pcie_aspm_create_sysfs_dev_files(dev
);
1360 if (!pci_probe_reset_function(dev
)) {
1361 retval
= device_create_file(&dev
->dev
, &reset_attr
);
1369 pcie_aspm_remove_sysfs_dev_files(dev
);
1370 if (dev
->vpd
&& dev
->vpd
->attr
) {
1371 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1372 kfree(dev
->vpd
->attr
);
1378 int __must_check
pci_create_sysfs_dev_files(struct pci_dev
*pdev
)
1382 struct bin_attribute
*attr
;
1384 if (!sysfs_initialized
)
1387 if (pdev
->cfg_size
> PCI_CFG_SPACE_SIZE
)
1388 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1390 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1394 retval
= pci_create_resource_files(pdev
);
1396 goto err_config_file
;
1398 /* If the device has a ROM, try to expose it in sysfs. */
1399 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1401 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1404 goto err_resource_files
;
1406 sysfs_bin_attr_init(attr
);
1407 attr
->size
= rom_size
;
1408 attr
->attr
.name
= "rom";
1409 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1410 attr
->read
= pci_read_rom
;
1411 attr
->write
= pci_write_rom
;
1412 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, attr
);
1415 goto err_resource_files
;
1417 pdev
->rom_attr
= attr
;
1420 /* add sysfs entries for various capabilities */
1421 retval
= pci_create_capabilities_sysfs(pdev
);
1425 pci_create_firmware_label_files(pdev
);
1430 if (pdev
->rom_attr
) {
1431 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1432 kfree(pdev
->rom_attr
);
1433 pdev
->rom_attr
= NULL
;
1436 pci_remove_resource_files(pdev
);
1438 if (pdev
->cfg_size
> PCI_CFG_SPACE_SIZE
)
1439 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1441 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1446 static void pci_remove_capabilities_sysfs(struct pci_dev
*dev
)
1448 if (dev
->vpd
&& dev
->vpd
->attr
) {
1449 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1450 kfree(dev
->vpd
->attr
);
1453 pcie_aspm_remove_sysfs_dev_files(dev
);
1454 if (dev
->reset_fn
) {
1455 device_remove_file(&dev
->dev
, &reset_attr
);
1461 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1462 * @pdev: device whose entries we should free
1464 * Cleanup when @pdev is removed from sysfs.
1466 void pci_remove_sysfs_dev_files(struct pci_dev
*pdev
)
1468 if (!sysfs_initialized
)
1471 pci_remove_capabilities_sysfs(pdev
);
1473 if (pdev
->cfg_size
> PCI_CFG_SPACE_SIZE
)
1474 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1476 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1478 pci_remove_resource_files(pdev
);
1480 if (pdev
->rom_attr
) {
1481 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1482 kfree(pdev
->rom_attr
);
1483 pdev
->rom_attr
= NULL
;
1486 pci_remove_firmware_label_files(pdev
);
1489 static int __init
pci_sysfs_init(void)
1491 struct pci_dev
*pdev
= NULL
;
1494 sysfs_initialized
= 1;
1495 for_each_pci_dev(pdev
) {
1496 retval
= pci_create_sysfs_dev_files(pdev
);
1505 late_initcall(pci_sysfs_init
);
1507 static struct attribute
*pci_dev_dev_attrs
[] = {
1512 static umode_t
pci_dev_attrs_are_visible(struct kobject
*kobj
,
1513 struct attribute
*a
, int n
)
1515 struct device
*dev
= kobj_to_dev(kobj
);
1516 struct pci_dev
*pdev
= to_pci_dev(dev
);
1518 if (a
== &vga_attr
.attr
)
1519 if ((pdev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
1525 static struct attribute
*pci_dev_hp_attrs
[] = {
1526 &dev_remove_attr
.attr
,
1527 &dev_rescan_attr
.attr
,
1531 static umode_t
pci_dev_hp_attrs_are_visible(struct kobject
*kobj
,
1532 struct attribute
*a
, int n
)
1534 struct device
*dev
= kobj_to_dev(kobj
);
1535 struct pci_dev
*pdev
= to_pci_dev(dev
);
1537 if (pdev
->is_virtfn
)
1543 static struct attribute_group pci_dev_hp_attr_group
= {
1544 .attrs
= pci_dev_hp_attrs
,
1545 .is_visible
= pci_dev_hp_attrs_are_visible
,
1548 #ifdef CONFIG_PCI_IOV
1549 static struct attribute
*sriov_dev_attrs
[] = {
1550 &sriov_totalvfs_attr
.attr
,
1551 &sriov_numvfs_attr
.attr
,
1555 static umode_t
sriov_attrs_are_visible(struct kobject
*kobj
,
1556 struct attribute
*a
, int n
)
1558 struct device
*dev
= kobj_to_dev(kobj
);
1560 if (!dev_is_pf(dev
))
1566 static struct attribute_group sriov_dev_attr_group
= {
1567 .attrs
= sriov_dev_attrs
,
1568 .is_visible
= sriov_attrs_are_visible
,
1570 #endif /* CONFIG_PCI_IOV */
1572 static struct attribute_group pci_dev_attr_group
= {
1573 .attrs
= pci_dev_dev_attrs
,
1574 .is_visible
= pci_dev_attrs_are_visible
,
1577 static const struct attribute_group
*pci_dev_attr_groups
[] = {
1578 &pci_dev_attr_group
,
1579 &pci_dev_hp_attr_group
,
1580 #ifdef CONFIG_PCI_IOV
1581 &sriov_dev_attr_group
,
1586 struct device_type pci_dev_type
= {
1587 .groups
= pci_dev_attr_groups
,