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
);
254 if (!pdev
->subordinate
)
257 return sprintf(buf
, "%u\n",
258 !(pdev
->subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
));
261 static ssize_t
msi_bus_store(struct device
*dev
, struct device_attribute
*attr
,
262 const char *buf
, size_t count
)
264 struct pci_dev
*pdev
= to_pci_dev(dev
);
267 if (kstrtoul(buf
, 0, &val
) < 0)
271 * Bad things may happen if the no_msi flag is changed
272 * while drivers are loaded.
274 if (!capable(CAP_SYS_ADMIN
))
278 * Maybe devices without subordinate buses shouldn't have this
279 * attribute in the first place?
281 if (!pdev
->subordinate
)
284 /* Is the flag going to change, or keep the value it already had? */
285 if (!(pdev
->subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
) ^
287 pdev
->subordinate
->bus_flags
^= PCI_BUS_FLAGS_NO_MSI
;
289 dev_warn(&pdev
->dev
, "forced subordinate bus to%s support MSI, bad things could happen\n",
295 static DEVICE_ATTR_RW(msi_bus
);
297 static ssize_t
bus_rescan_store(struct bus_type
*bus
, const char *buf
,
301 struct pci_bus
*b
= NULL
;
303 if (kstrtoul(buf
, 0, &val
) < 0)
307 pci_lock_rescan_remove();
308 while ((b
= pci_find_next_bus(b
)) != NULL
)
310 pci_unlock_rescan_remove();
314 static BUS_ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, bus_rescan_store
);
316 static struct attribute
*pci_bus_attrs
[] = {
317 &bus_attr_rescan
.attr
,
321 static const struct attribute_group pci_bus_group
= {
322 .attrs
= pci_bus_attrs
,
325 const struct attribute_group
*pci_bus_groups
[] = {
330 static ssize_t
dev_rescan_store(struct device
*dev
,
331 struct device_attribute
*attr
, const char *buf
,
335 struct pci_dev
*pdev
= to_pci_dev(dev
);
337 if (kstrtoul(buf
, 0, &val
) < 0)
341 pci_lock_rescan_remove();
342 pci_rescan_bus(pdev
->bus
);
343 pci_unlock_rescan_remove();
347 static struct device_attribute dev_rescan_attr
= __ATTR(rescan
,
349 NULL
, dev_rescan_store
);
351 static ssize_t
remove_store(struct device
*dev
, struct device_attribute
*attr
,
352 const char *buf
, size_t count
)
356 if (kstrtoul(buf
, 0, &val
) < 0)
359 if (val
&& device_remove_file_self(dev
, attr
))
360 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev
));
363 static struct device_attribute dev_remove_attr
= __ATTR(remove
,
367 static ssize_t
dev_bus_rescan_store(struct device
*dev
,
368 struct device_attribute
*attr
,
369 const char *buf
, size_t count
)
372 struct pci_bus
*bus
= to_pci_bus(dev
);
374 if (kstrtoul(buf
, 0, &val
) < 0)
378 pci_lock_rescan_remove();
379 if (!pci_is_root_bus(bus
) && list_empty(&bus
->devices
))
380 pci_rescan_bus_bridge_resize(bus
->self
);
383 pci_unlock_rescan_remove();
387 static DEVICE_ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, dev_bus_rescan_store
);
389 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
390 static ssize_t
d3cold_allowed_store(struct device
*dev
,
391 struct device_attribute
*attr
,
392 const char *buf
, size_t count
)
394 struct pci_dev
*pdev
= to_pci_dev(dev
);
397 if (kstrtoul(buf
, 0, &val
) < 0)
400 pdev
->d3cold_allowed
= !!val
;
401 pm_runtime_resume(dev
);
406 static ssize_t
d3cold_allowed_show(struct device
*dev
,
407 struct device_attribute
*attr
, char *buf
)
409 struct pci_dev
*pdev
= to_pci_dev(dev
);
410 return sprintf(buf
, "%u\n", pdev
->d3cold_allowed
);
412 static DEVICE_ATTR_RW(d3cold_allowed
);
416 static ssize_t
devspec_show(struct device
*dev
,
417 struct device_attribute
*attr
, char *buf
)
419 struct pci_dev
*pdev
= to_pci_dev(dev
);
420 struct device_node
*np
= pci_device_to_OF_node(pdev
);
422 if (np
== NULL
|| np
->full_name
== NULL
)
424 return sprintf(buf
, "%s", np
->full_name
);
426 static DEVICE_ATTR_RO(devspec
);
429 #ifdef CONFIG_PCI_IOV
430 static ssize_t
sriov_totalvfs_show(struct device
*dev
,
431 struct device_attribute
*attr
,
434 struct pci_dev
*pdev
= to_pci_dev(dev
);
436 return sprintf(buf
, "%u\n", pci_sriov_get_totalvfs(pdev
));
440 static ssize_t
sriov_numvfs_show(struct device
*dev
,
441 struct device_attribute
*attr
,
444 struct pci_dev
*pdev
= to_pci_dev(dev
);
446 return sprintf(buf
, "%u\n", pdev
->sriov
->num_VFs
);
450 * num_vfs > 0; number of VFs to enable
451 * num_vfs = 0; disable all VFs
453 * Note: SRIOV spec doesn't allow partial VF
454 * disable, so it's all or none.
456 static ssize_t
sriov_numvfs_store(struct device
*dev
,
457 struct device_attribute
*attr
,
458 const char *buf
, size_t count
)
460 struct pci_dev
*pdev
= to_pci_dev(dev
);
464 ret
= kstrtou16(buf
, 0, &num_vfs
);
468 if (num_vfs
> pci_sriov_get_totalvfs(pdev
))
471 if (num_vfs
== pdev
->sriov
->num_VFs
)
472 return count
; /* no change */
474 /* is PF driver loaded w/callback */
475 if (!pdev
->driver
|| !pdev
->driver
->sriov_configure
) {
476 dev_info(&pdev
->dev
, "Driver doesn't support SRIOV configuration via sysfs\n");
482 ret
= pdev
->driver
->sriov_configure(pdev
, 0);
489 if (pdev
->sriov
->num_VFs
) {
490 dev_warn(&pdev
->dev
, "%d VFs already enabled. Disable before enabling %d VFs\n",
491 pdev
->sriov
->num_VFs
, num_vfs
);
495 ret
= pdev
->driver
->sriov_configure(pdev
, num_vfs
);
500 dev_warn(&pdev
->dev
, "%d VFs requested; only %d enabled\n",
506 static struct device_attribute sriov_totalvfs_attr
= __ATTR_RO(sriov_totalvfs
);
507 static struct device_attribute sriov_numvfs_attr
=
508 __ATTR(sriov_numvfs
, (S_IRUGO
|S_IWUSR
|S_IWGRP
),
509 sriov_numvfs_show
, sriov_numvfs_store
);
510 #endif /* CONFIG_PCI_IOV */
512 static ssize_t
driver_override_store(struct device
*dev
,
513 struct device_attribute
*attr
,
514 const char *buf
, size_t count
)
516 struct pci_dev
*pdev
= to_pci_dev(dev
);
517 char *driver_override
, *old
= pdev
->driver_override
, *cp
;
519 if (count
> PATH_MAX
)
522 driver_override
= kstrndup(buf
, count
, GFP_KERNEL
);
523 if (!driver_override
)
526 cp
= strchr(driver_override
, '\n');
530 if (strlen(driver_override
)) {
531 pdev
->driver_override
= driver_override
;
533 kfree(driver_override
);
534 pdev
->driver_override
= NULL
;
542 static ssize_t
driver_override_show(struct device
*dev
,
543 struct device_attribute
*attr
, char *buf
)
545 struct pci_dev
*pdev
= to_pci_dev(dev
);
547 return sprintf(buf
, "%s\n", pdev
->driver_override
);
549 static DEVICE_ATTR_RW(driver_override
);
551 static struct attribute
*pci_dev_attrs
[] = {
552 &dev_attr_resource
.attr
,
553 &dev_attr_vendor
.attr
,
554 &dev_attr_device
.attr
,
555 &dev_attr_subsystem_vendor
.attr
,
556 &dev_attr_subsystem_device
.attr
,
557 &dev_attr_class
.attr
,
559 &dev_attr_local_cpus
.attr
,
560 &dev_attr_local_cpulist
.attr
,
561 &dev_attr_modalias
.attr
,
563 &dev_attr_numa_node
.attr
,
565 &dev_attr_dma_mask_bits
.attr
,
566 &dev_attr_consistent_dma_mask_bits
.attr
,
567 &dev_attr_enabled
.attr
,
568 &dev_attr_broken_parity_status
.attr
,
569 &dev_attr_msi_bus
.attr
,
570 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
571 &dev_attr_d3cold_allowed
.attr
,
574 &dev_attr_devspec
.attr
,
576 &dev_attr_driver_override
.attr
,
580 static const struct attribute_group pci_dev_group
= {
581 .attrs
= pci_dev_attrs
,
584 const struct attribute_group
*pci_dev_groups
[] = {
589 static struct attribute
*pcibus_attrs
[] = {
590 &dev_attr_rescan
.attr
,
591 &dev_attr_cpuaffinity
.attr
,
592 &dev_attr_cpulistaffinity
.attr
,
596 static const struct attribute_group pcibus_group
= {
597 .attrs
= pcibus_attrs
,
600 const struct attribute_group
*pcibus_groups
[] = {
605 static ssize_t
boot_vga_show(struct device
*dev
, struct device_attribute
*attr
,
608 struct pci_dev
*pdev
= to_pci_dev(dev
);
609 struct pci_dev
*vga_dev
= vga_default_device();
612 return sprintf(buf
, "%u\n", (pdev
== vga_dev
));
614 return sprintf(buf
, "%u\n",
615 !!(pdev
->resource
[PCI_ROM_RESOURCE
].flags
&
616 IORESOURCE_ROM_SHADOW
));
618 static struct device_attribute vga_attr
= __ATTR_RO(boot_vga
);
620 static ssize_t
pci_read_config(struct file
*filp
, struct kobject
*kobj
,
621 struct bin_attribute
*bin_attr
, char *buf
,
622 loff_t off
, size_t count
)
624 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
, struct device
,
626 unsigned int size
= 64;
627 loff_t init_off
= off
;
628 u8
*data
= (u8
*) buf
;
630 /* Several chips lock up trying to read undefined config space */
631 if (security_capable(filp
->f_cred
, &init_user_ns
, CAP_SYS_ADMIN
) == 0)
632 size
= dev
->cfg_size
;
633 else if (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
)
638 if (off
+ count
> size
) {
645 pci_config_pm_runtime_get(dev
);
647 if ((off
& 1) && size
) {
649 pci_user_read_config_byte(dev
, off
, &val
);
650 data
[off
- init_off
] = val
;
655 if ((off
& 3) && size
> 2) {
657 pci_user_read_config_word(dev
, off
, &val
);
658 data
[off
- init_off
] = val
& 0xff;
659 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
666 pci_user_read_config_dword(dev
, off
, &val
);
667 data
[off
- init_off
] = val
& 0xff;
668 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
669 data
[off
- init_off
+ 2] = (val
>> 16) & 0xff;
670 data
[off
- init_off
+ 3] = (val
>> 24) & 0xff;
677 pci_user_read_config_word(dev
, off
, &val
);
678 data
[off
- init_off
] = val
& 0xff;
679 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
686 pci_user_read_config_byte(dev
, off
, &val
);
687 data
[off
- init_off
] = val
;
692 pci_config_pm_runtime_put(dev
);
697 static ssize_t
pci_write_config(struct file
*filp
, struct kobject
*kobj
,
698 struct bin_attribute
*bin_attr
, char *buf
,
699 loff_t off
, size_t count
)
701 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
, struct device
,
703 unsigned int size
= count
;
704 loff_t init_off
= off
;
705 u8
*data
= (u8
*) buf
;
707 if (off
> dev
->cfg_size
)
709 if (off
+ count
> dev
->cfg_size
) {
710 size
= dev
->cfg_size
- off
;
714 pci_config_pm_runtime_get(dev
);
716 if ((off
& 1) && size
) {
717 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
722 if ((off
& 3) && size
> 2) {
723 u16 val
= data
[off
- init_off
];
724 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
725 pci_user_write_config_word(dev
, off
, val
);
731 u32 val
= data
[off
- init_off
];
732 val
|= (u32
) data
[off
- init_off
+ 1] << 8;
733 val
|= (u32
) data
[off
- init_off
+ 2] << 16;
734 val
|= (u32
) data
[off
- init_off
+ 3] << 24;
735 pci_user_write_config_dword(dev
, off
, val
);
741 u16 val
= data
[off
- init_off
];
742 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
743 pci_user_write_config_word(dev
, off
, val
);
749 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
754 pci_config_pm_runtime_put(dev
);
759 static ssize_t
read_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
760 struct bin_attribute
*bin_attr
, char *buf
,
761 loff_t off
, size_t count
)
763 struct pci_dev
*dev
=
764 to_pci_dev(container_of(kobj
, struct device
, kobj
));
766 if (off
> bin_attr
->size
)
768 else if (count
> bin_attr
->size
- off
)
769 count
= bin_attr
->size
- off
;
771 return pci_read_vpd(dev
, off
, count
, buf
);
774 static ssize_t
write_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
775 struct bin_attribute
*bin_attr
, char *buf
,
776 loff_t off
, size_t count
)
778 struct pci_dev
*dev
=
779 to_pci_dev(container_of(kobj
, struct device
, kobj
));
781 if (off
> bin_attr
->size
)
783 else if (count
> bin_attr
->size
- off
)
784 count
= bin_attr
->size
- off
;
786 return pci_write_vpd(dev
, off
, count
, buf
);
789 #ifdef HAVE_PCI_LEGACY
791 * pci_read_legacy_io - read byte(s) from legacy I/O port space
792 * @filp: open sysfs file
793 * @kobj: kobject corresponding to file to read from
794 * @bin_attr: struct bin_attribute for this file
795 * @buf: buffer to store results
796 * @off: offset into legacy I/O port space
797 * @count: number of bytes to read
799 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
800 * callback routine (pci_legacy_read).
802 static ssize_t
pci_read_legacy_io(struct file
*filp
, struct kobject
*kobj
,
803 struct bin_attribute
*bin_attr
, char *buf
,
804 loff_t off
, size_t count
)
806 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
809 /* Only support 1, 2 or 4 byte accesses */
810 if (count
!= 1 && count
!= 2 && count
!= 4)
813 return pci_legacy_read(bus
, off
, (u32
*)buf
, count
);
817 * pci_write_legacy_io - write byte(s) to legacy I/O port space
818 * @filp: open sysfs file
819 * @kobj: kobject corresponding to file to read from
820 * @bin_attr: struct bin_attribute for this file
821 * @buf: buffer containing value to be written
822 * @off: offset into legacy I/O port space
823 * @count: number of bytes to write
825 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
826 * callback routine (pci_legacy_write).
828 static ssize_t
pci_write_legacy_io(struct file
*filp
, struct kobject
*kobj
,
829 struct bin_attribute
*bin_attr
, char *buf
,
830 loff_t off
, size_t count
)
832 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
835 /* Only support 1, 2 or 4 byte accesses */
836 if (count
!= 1 && count
!= 2 && count
!= 4)
839 return pci_legacy_write(bus
, off
, *(u32
*)buf
, count
);
843 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
844 * @filp: open sysfs file
845 * @kobj: kobject corresponding to device to be mapped
846 * @attr: struct bin_attribute for this file
847 * @vma: struct vm_area_struct passed to mmap
849 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
850 * legacy memory space (first meg of bus space) into application virtual
853 static int pci_mmap_legacy_mem(struct file
*filp
, struct kobject
*kobj
,
854 struct bin_attribute
*attr
,
855 struct vm_area_struct
*vma
)
857 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
860 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_mem
);
864 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
865 * @filp: open sysfs file
866 * @kobj: kobject corresponding to device to be mapped
867 * @attr: struct bin_attribute for this file
868 * @vma: struct vm_area_struct passed to mmap
870 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
871 * legacy IO space (first meg of bus space) into application virtual
872 * memory space. Returns -ENOSYS if the operation isn't supported
874 static int pci_mmap_legacy_io(struct file
*filp
, struct kobject
*kobj
,
875 struct bin_attribute
*attr
,
876 struct vm_area_struct
*vma
)
878 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
881 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_io
);
885 * pci_adjust_legacy_attr - adjustment of legacy file attributes
886 * @b: bus to create files under
887 * @mmap_type: I/O port or memory
889 * Stub implementation. Can be overridden by arch if necessary.
891 void __weak
pci_adjust_legacy_attr(struct pci_bus
*b
,
892 enum pci_mmap_state mmap_type
)
897 * pci_create_legacy_files - create legacy I/O port and memory files
898 * @b: bus to create files under
900 * Some platforms allow access to legacy I/O port and ISA memory space on
901 * a per-bus basis. This routine creates the files and ties them into
902 * their associated read, write and mmap files from pci-sysfs.c
904 * On error unwind, but don't propagate the error to the caller
905 * as it is ok to set up the PCI bus without these files.
907 void pci_create_legacy_files(struct pci_bus
*b
)
911 b
->legacy_io
= kzalloc(sizeof(struct bin_attribute
) * 2,
916 sysfs_bin_attr_init(b
->legacy_io
);
917 b
->legacy_io
->attr
.name
= "legacy_io";
918 b
->legacy_io
->size
= 0xffff;
919 b
->legacy_io
->attr
.mode
= S_IRUSR
| S_IWUSR
;
920 b
->legacy_io
->read
= pci_read_legacy_io
;
921 b
->legacy_io
->write
= pci_write_legacy_io
;
922 b
->legacy_io
->mmap
= pci_mmap_legacy_io
;
923 pci_adjust_legacy_attr(b
, pci_mmap_io
);
924 error
= device_create_bin_file(&b
->dev
, b
->legacy_io
);
928 /* Allocated above after the legacy_io struct */
929 b
->legacy_mem
= b
->legacy_io
+ 1;
930 sysfs_bin_attr_init(b
->legacy_mem
);
931 b
->legacy_mem
->attr
.name
= "legacy_mem";
932 b
->legacy_mem
->size
= 1024*1024;
933 b
->legacy_mem
->attr
.mode
= S_IRUSR
| S_IWUSR
;
934 b
->legacy_mem
->mmap
= pci_mmap_legacy_mem
;
935 pci_adjust_legacy_attr(b
, pci_mmap_mem
);
936 error
= device_create_bin_file(&b
->dev
, b
->legacy_mem
);
943 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
948 printk(KERN_WARNING
"pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
952 void pci_remove_legacy_files(struct pci_bus
*b
)
955 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
956 device_remove_bin_file(&b
->dev
, b
->legacy_mem
);
957 kfree(b
->legacy_io
); /* both are allocated here */
960 #endif /* HAVE_PCI_LEGACY */
964 int pci_mmap_fits(struct pci_dev
*pdev
, int resno
, struct vm_area_struct
*vma
,
965 enum pci_mmap_api mmap_api
)
967 unsigned long nr
, start
, size
, pci_start
;
969 if (pci_resource_len(pdev
, resno
) == 0)
972 start
= vma
->vm_pgoff
;
973 size
= ((pci_resource_len(pdev
, resno
) - 1) >> PAGE_SHIFT
) + 1;
974 pci_start
= (mmap_api
== PCI_MMAP_PROCFS
) ?
975 pci_resource_start(pdev
, resno
) >> PAGE_SHIFT
: 0;
976 if (start
>= pci_start
&& start
< pci_start
+ size
&&
977 start
+ nr
<= pci_start
+ size
)
983 * pci_mmap_resource - map a PCI resource into user memory space
984 * @kobj: kobject for mapping
985 * @attr: struct bin_attribute for the file being mapped
986 * @vma: struct vm_area_struct passed into the mmap
987 * @write_combine: 1 for write_combine mapping
989 * Use the regular PCI mapping routines to map a PCI resource into userspace.
991 static int pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
992 struct vm_area_struct
*vma
, int write_combine
)
994 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
995 struct device
, kobj
));
996 struct resource
*res
= attr
->private;
997 enum pci_mmap_state mmap_type
;
998 resource_size_t start
, end
;
1001 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
1002 if (res
== &pdev
->resource
[i
])
1004 if (i
>= PCI_ROM_RESOURCE
)
1007 if (!pci_mmap_fits(pdev
, i
, vma
, PCI_MMAP_SYSFS
)) {
1008 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",
1009 current
->comm
, vma
->vm_end
-vma
->vm_start
, vma
->vm_pgoff
,
1011 (u64
)pci_resource_start(pdev
, i
),
1012 (u64
)pci_resource_len(pdev
, i
));
1016 /* pci_mmap_page_range() expects the same kind of entry as coming
1017 * from /proc/bus/pci/ which is a "user visible" value. If this is
1018 * different from the resource itself, arch will do necessary fixup.
1020 pci_resource_to_user(pdev
, i
, res
, &start
, &end
);
1021 vma
->vm_pgoff
+= start
>> PAGE_SHIFT
;
1022 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
1024 if (res
->flags
& IORESOURCE_MEM
&& iomem_is_exclusive(start
))
1027 return pci_mmap_page_range(pdev
, vma
, mmap_type
, write_combine
);
1030 static int pci_mmap_resource_uc(struct file
*filp
, struct kobject
*kobj
,
1031 struct bin_attribute
*attr
,
1032 struct vm_area_struct
*vma
)
1034 return pci_mmap_resource(kobj
, attr
, vma
, 0);
1037 static int pci_mmap_resource_wc(struct file
*filp
, struct kobject
*kobj
,
1038 struct bin_attribute
*attr
,
1039 struct vm_area_struct
*vma
)
1041 return pci_mmap_resource(kobj
, attr
, vma
, 1);
1044 static ssize_t
pci_resource_io(struct file
*filp
, struct kobject
*kobj
,
1045 struct bin_attribute
*attr
, char *buf
,
1046 loff_t off
, size_t count
, bool write
)
1048 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
1049 struct device
, kobj
));
1050 struct resource
*res
= attr
->private;
1051 unsigned long port
= off
;
1054 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
1055 if (res
== &pdev
->resource
[i
])
1057 if (i
>= PCI_ROM_RESOURCE
)
1060 port
+= pci_resource_start(pdev
, i
);
1062 if (port
> pci_resource_end(pdev
, i
))
1065 if (port
+ count
- 1 > pci_resource_end(pdev
, i
))
1071 outb(*(u8
*)buf
, port
);
1073 *(u8
*)buf
= inb(port
);
1077 outw(*(u16
*)buf
, port
);
1079 *(u16
*)buf
= inw(port
);
1083 outl(*(u32
*)buf
, port
);
1085 *(u32
*)buf
= inl(port
);
1091 static ssize_t
pci_read_resource_io(struct file
*filp
, struct kobject
*kobj
,
1092 struct bin_attribute
*attr
, char *buf
,
1093 loff_t off
, size_t count
)
1095 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, false);
1098 static ssize_t
pci_write_resource_io(struct file
*filp
, struct kobject
*kobj
,
1099 struct bin_attribute
*attr
, char *buf
,
1100 loff_t off
, size_t count
)
1102 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, true);
1106 * pci_remove_resource_files - cleanup resource files
1107 * @pdev: dev to cleanup
1109 * If we created resource files for @pdev, remove them from sysfs and
1110 * free their resources.
1112 static void pci_remove_resource_files(struct pci_dev
*pdev
)
1116 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1117 struct bin_attribute
*res_attr
;
1119 res_attr
= pdev
->res_attr
[i
];
1121 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1125 res_attr
= pdev
->res_attr_wc
[i
];
1127 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1133 static int pci_create_attr(struct pci_dev
*pdev
, int num
, int write_combine
)
1135 /* allocate attribute structure, piggyback attribute name */
1136 int name_len
= write_combine
? 13 : 10;
1137 struct bin_attribute
*res_attr
;
1140 res_attr
= kzalloc(sizeof(*res_attr
) + name_len
, GFP_ATOMIC
);
1142 char *res_attr_name
= (char *)(res_attr
+ 1);
1144 sysfs_bin_attr_init(res_attr
);
1145 if (write_combine
) {
1146 pdev
->res_attr_wc
[num
] = res_attr
;
1147 sprintf(res_attr_name
, "resource%d_wc", num
);
1148 res_attr
->mmap
= pci_mmap_resource_wc
;
1150 pdev
->res_attr
[num
] = res_attr
;
1151 sprintf(res_attr_name
, "resource%d", num
);
1152 res_attr
->mmap
= pci_mmap_resource_uc
;
1154 if (pci_resource_flags(pdev
, num
) & IORESOURCE_IO
) {
1155 res_attr
->read
= pci_read_resource_io
;
1156 res_attr
->write
= pci_write_resource_io
;
1158 res_attr
->attr
.name
= res_attr_name
;
1159 res_attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1160 res_attr
->size
= pci_resource_len(pdev
, num
);
1161 res_attr
->private = &pdev
->resource
[num
];
1162 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
1170 * pci_create_resource_files - create resource files in sysfs for @dev
1171 * @pdev: dev in question
1173 * Walk the resources in @pdev creating files for each resource available.
1175 static int pci_create_resource_files(struct pci_dev
*pdev
)
1180 /* Expose the PCI resources from this device as files */
1181 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1183 /* skip empty resources */
1184 if (!pci_resource_len(pdev
, i
))
1187 retval
= pci_create_attr(pdev
, i
, 0);
1188 /* for prefetchable resources, create a WC mappable file */
1189 if (!retval
&& pdev
->resource
[i
].flags
& IORESOURCE_PREFETCH
)
1190 retval
= pci_create_attr(pdev
, i
, 1);
1193 pci_remove_resource_files(pdev
);
1199 #else /* !HAVE_PCI_MMAP */
1200 int __weak
pci_create_resource_files(struct pci_dev
*dev
) { return 0; }
1201 void __weak
pci_remove_resource_files(struct pci_dev
*dev
) { return; }
1202 #endif /* HAVE_PCI_MMAP */
1205 * pci_write_rom - used to enable access to the PCI ROM display
1207 * @kobj: kernel object handle
1208 * @bin_attr: struct bin_attribute for this file
1211 * @count: number of byte in input
1213 * writing anything except 0 enables it
1215 static ssize_t
pci_write_rom(struct file
*filp
, struct kobject
*kobj
,
1216 struct bin_attribute
*bin_attr
, char *buf
,
1217 loff_t off
, size_t count
)
1219 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1221 if ((off
== 0) && (*buf
== '0') && (count
== 2))
1222 pdev
->rom_attr_enabled
= 0;
1224 pdev
->rom_attr_enabled
= 1;
1230 * pci_read_rom - read a PCI ROM
1232 * @kobj: kernel object handle
1233 * @bin_attr: struct bin_attribute for this file
1234 * @buf: where to put the data we read from the ROM
1236 * @count: number of bytes to read
1238 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1239 * device corresponding to @kobj.
1241 static ssize_t
pci_read_rom(struct file
*filp
, struct kobject
*kobj
,
1242 struct bin_attribute
*bin_attr
, char *buf
,
1243 loff_t off
, size_t count
)
1245 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1249 if (!pdev
->rom_attr_enabled
)
1252 rom
= pci_map_rom(pdev
, &size
); /* size starts out as PCI window size */
1259 if (off
+ count
> size
)
1262 memcpy_fromio(buf
, rom
+ off
, count
);
1264 pci_unmap_rom(pdev
, rom
);
1269 static struct bin_attribute pci_config_attr
= {
1272 .mode
= S_IRUGO
| S_IWUSR
,
1274 .size
= PCI_CFG_SPACE_SIZE
,
1275 .read
= pci_read_config
,
1276 .write
= pci_write_config
,
1279 static struct bin_attribute pcie_config_attr
= {
1282 .mode
= S_IRUGO
| S_IWUSR
,
1284 .size
= PCI_CFG_SPACE_EXP_SIZE
,
1285 .read
= pci_read_config
,
1286 .write
= pci_write_config
,
1289 static ssize_t
reset_store(struct device
*dev
, struct device_attribute
*attr
,
1290 const char *buf
, size_t count
)
1292 struct pci_dev
*pdev
= to_pci_dev(dev
);
1294 ssize_t result
= kstrtoul(buf
, 0, &val
);
1302 result
= pci_reset_function(pdev
);
1309 static struct device_attribute reset_attr
= __ATTR(reset
, 0200, NULL
, reset_store
);
1311 static int pci_create_capabilities_sysfs(struct pci_dev
*dev
)
1314 struct bin_attribute
*attr
;
1316 /* If the device has VPD, try to expose it in sysfs. */
1318 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1322 sysfs_bin_attr_init(attr
);
1323 attr
->size
= dev
->vpd
->len
;
1324 attr
->attr
.name
= "vpd";
1325 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1326 attr
->read
= read_vpd_attr
;
1327 attr
->write
= write_vpd_attr
;
1328 retval
= sysfs_create_bin_file(&dev
->dev
.kobj
, attr
);
1333 dev
->vpd
->attr
= attr
;
1336 /* Active State Power Management */
1337 pcie_aspm_create_sysfs_dev_files(dev
);
1339 if (!pci_probe_reset_function(dev
)) {
1340 retval
= device_create_file(&dev
->dev
, &reset_attr
);
1348 pcie_aspm_remove_sysfs_dev_files(dev
);
1349 if (dev
->vpd
&& dev
->vpd
->attr
) {
1350 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1351 kfree(dev
->vpd
->attr
);
1357 int __must_check
pci_create_sysfs_dev_files(struct pci_dev
*pdev
)
1361 struct bin_attribute
*attr
;
1363 if (!sysfs_initialized
)
1366 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1367 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1369 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1373 retval
= pci_create_resource_files(pdev
);
1375 goto err_config_file
;
1377 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1378 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1379 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1382 /* If the device has a ROM, try to expose it in sysfs. */
1384 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1387 goto err_resource_files
;
1389 sysfs_bin_attr_init(attr
);
1390 attr
->size
= rom_size
;
1391 attr
->attr
.name
= "rom";
1392 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1393 attr
->read
= pci_read_rom
;
1394 attr
->write
= pci_write_rom
;
1395 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, attr
);
1398 goto err_resource_files
;
1400 pdev
->rom_attr
= attr
;
1403 /* add sysfs entries for various capabilities */
1404 retval
= pci_create_capabilities_sysfs(pdev
);
1408 pci_create_firmware_label_files(pdev
);
1414 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1415 kfree(pdev
->rom_attr
);
1416 pdev
->rom_attr
= NULL
;
1419 pci_remove_resource_files(pdev
);
1421 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1422 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1424 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1429 static void pci_remove_capabilities_sysfs(struct pci_dev
*dev
)
1431 if (dev
->vpd
&& dev
->vpd
->attr
) {
1432 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1433 kfree(dev
->vpd
->attr
);
1436 pcie_aspm_remove_sysfs_dev_files(dev
);
1437 if (dev
->reset_fn
) {
1438 device_remove_file(&dev
->dev
, &reset_attr
);
1444 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1445 * @pdev: device whose entries we should free
1447 * Cleanup when @pdev is removed from sysfs.
1449 void pci_remove_sysfs_dev_files(struct pci_dev
*pdev
)
1453 if (!sysfs_initialized
)
1456 pci_remove_capabilities_sysfs(pdev
);
1458 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1459 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1461 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1463 pci_remove_resource_files(pdev
);
1465 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1466 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1467 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1470 if (rom_size
&& pdev
->rom_attr
) {
1471 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1472 kfree(pdev
->rom_attr
);
1475 pci_remove_firmware_label_files(pdev
);
1479 static int __init
pci_sysfs_init(void)
1481 struct pci_dev
*pdev
= NULL
;
1484 sysfs_initialized
= 1;
1485 for_each_pci_dev(pdev
) {
1486 retval
= pci_create_sysfs_dev_files(pdev
);
1495 late_initcall(pci_sysfs_init
);
1497 static struct attribute
*pci_dev_dev_attrs
[] = {
1502 static umode_t
pci_dev_attrs_are_visible(struct kobject
*kobj
,
1503 struct attribute
*a
, int n
)
1505 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1506 struct pci_dev
*pdev
= to_pci_dev(dev
);
1508 if (a
== &vga_attr
.attr
)
1509 if ((pdev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
1515 static struct attribute
*pci_dev_hp_attrs
[] = {
1516 &dev_remove_attr
.attr
,
1517 &dev_rescan_attr
.attr
,
1521 static umode_t
pci_dev_hp_attrs_are_visible(struct kobject
*kobj
,
1522 struct attribute
*a
, int n
)
1524 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1525 struct pci_dev
*pdev
= to_pci_dev(dev
);
1527 if (pdev
->is_virtfn
)
1533 static struct attribute_group pci_dev_hp_attr_group
= {
1534 .attrs
= pci_dev_hp_attrs
,
1535 .is_visible
= pci_dev_hp_attrs_are_visible
,
1538 #ifdef CONFIG_PCI_IOV
1539 static struct attribute
*sriov_dev_attrs
[] = {
1540 &sriov_totalvfs_attr
.attr
,
1541 &sriov_numvfs_attr
.attr
,
1545 static umode_t
sriov_attrs_are_visible(struct kobject
*kobj
,
1546 struct attribute
*a
, int n
)
1548 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1550 if (!dev_is_pf(dev
))
1556 static struct attribute_group sriov_dev_attr_group
= {
1557 .attrs
= sriov_dev_attrs
,
1558 .is_visible
= sriov_attrs_are_visible
,
1560 #endif /* CONFIG_PCI_IOV */
1562 static struct attribute_group pci_dev_attr_group
= {
1563 .attrs
= pci_dev_dev_attrs
,
1564 .is_visible
= pci_dev_attrs_are_visible
,
1567 static const struct attribute_group
*pci_dev_attr_groups
[] = {
1568 &pci_dev_attr_group
,
1569 &pci_dev_hp_attr_group
,
1570 #ifdef CONFIG_PCI_IOV
1571 &sriov_dev_attr_group
,
1576 struct device_type pci_dev_type
= {
1577 .groups
= pci_dev_attr_groups
,