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
, bool list
,
81 struct device_attribute
*attr
, char *buf
)
83 const struct cpumask
*mask
;
86 mask
= (dev_to_node(dev
) == -1) ? cpu_online_mask
:
87 cpumask_of_node(dev_to_node(dev
));
89 mask
= cpumask_of_pcibus(to_pci_dev(dev
)->bus
);
91 return cpumap_print_to_pagebuf(list
, buf
, mask
);
94 static ssize_t
local_cpus_show(struct device
*dev
,
95 struct device_attribute
*attr
, char *buf
)
97 return pci_dev_show_local_cpu(dev
, false, attr
, buf
);
99 static DEVICE_ATTR_RO(local_cpus
);
101 static ssize_t
local_cpulist_show(struct device
*dev
,
102 struct device_attribute
*attr
, char *buf
)
104 return pci_dev_show_local_cpu(dev
, true, attr
, buf
);
106 static DEVICE_ATTR_RO(local_cpulist
);
109 * PCI Bus Class Devices
111 static ssize_t
cpuaffinity_show(struct device
*dev
,
112 struct device_attribute
*attr
, char *buf
)
114 const struct cpumask
*cpumask
= cpumask_of_pcibus(to_pci_bus(dev
));
116 return cpumap_print_to_pagebuf(false, buf
, cpumask
);
118 static DEVICE_ATTR_RO(cpuaffinity
);
120 static ssize_t
cpulistaffinity_show(struct device
*dev
,
121 struct device_attribute
*attr
, char *buf
)
123 const struct cpumask
*cpumask
= cpumask_of_pcibus(to_pci_bus(dev
));
125 return cpumap_print_to_pagebuf(true, buf
, cpumask
);
127 static DEVICE_ATTR_RO(cpulistaffinity
);
130 static ssize_t
resource_show(struct device
*dev
, struct device_attribute
*attr
,
133 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
137 resource_size_t start
, end
;
139 if (pci_dev
->subordinate
)
140 max
= DEVICE_COUNT_RESOURCE
;
142 max
= PCI_BRIDGE_RESOURCES
;
144 for (i
= 0; i
< max
; i
++) {
145 struct resource
*res
= &pci_dev
->resource
[i
];
146 pci_resource_to_user(pci_dev
, i
, res
, &start
, &end
);
147 str
+= sprintf(str
, "0x%016llx 0x%016llx 0x%016llx\n",
148 (unsigned long long)start
,
149 (unsigned long long)end
,
150 (unsigned long long)res
->flags
);
154 static DEVICE_ATTR_RO(resource
);
156 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*attr
,
159 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
161 return sprintf(buf
, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
162 pci_dev
->vendor
, pci_dev
->device
,
163 pci_dev
->subsystem_vendor
, pci_dev
->subsystem_device
,
164 (u8
)(pci_dev
->class >> 16), (u8
)(pci_dev
->class >> 8),
165 (u8
)(pci_dev
->class));
167 static DEVICE_ATTR_RO(modalias
);
169 static ssize_t
enable_store(struct device
*dev
, struct device_attribute
*attr
,
170 const char *buf
, size_t count
)
172 struct pci_dev
*pdev
= to_pci_dev(dev
);
174 ssize_t result
= kstrtoul(buf
, 0, &val
);
179 /* this can crash the machine when done on the "wrong" device */
180 if (!capable(CAP_SYS_ADMIN
))
184 if (pci_is_enabled(pdev
))
185 pci_disable_device(pdev
);
189 result
= pci_enable_device(pdev
);
191 return result
< 0 ? result
: count
;
194 static ssize_t
enable_show(struct device
*dev
, struct device_attribute
*attr
,
197 struct pci_dev
*pdev
;
199 pdev
= to_pci_dev(dev
);
200 return sprintf(buf
, "%u\n", atomic_read(&pdev
->enable_cnt
));
202 static DEVICE_ATTR_RW(enable
);
205 static ssize_t
numa_node_show(struct device
*dev
, struct device_attribute
*attr
,
208 return sprintf(buf
, "%d\n", dev
->numa_node
);
210 static DEVICE_ATTR_RO(numa_node
);
213 static ssize_t
dma_mask_bits_show(struct device
*dev
,
214 struct device_attribute
*attr
, char *buf
)
216 struct pci_dev
*pdev
= to_pci_dev(dev
);
218 return sprintf(buf
, "%d\n", fls64(pdev
->dma_mask
));
220 static DEVICE_ATTR_RO(dma_mask_bits
);
222 static ssize_t
consistent_dma_mask_bits_show(struct device
*dev
,
223 struct device_attribute
*attr
,
226 return sprintf(buf
, "%d\n", fls64(dev
->coherent_dma_mask
));
228 static DEVICE_ATTR_RO(consistent_dma_mask_bits
);
230 static ssize_t
msi_bus_show(struct device
*dev
, struct device_attribute
*attr
,
233 struct pci_dev
*pdev
= to_pci_dev(dev
);
234 struct pci_bus
*subordinate
= pdev
->subordinate
;
236 return sprintf(buf
, "%u\n", subordinate
?
237 !(subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
)
241 static ssize_t
msi_bus_store(struct device
*dev
, struct device_attribute
*attr
,
242 const char *buf
, size_t count
)
244 struct pci_dev
*pdev
= to_pci_dev(dev
);
245 struct pci_bus
*subordinate
= pdev
->subordinate
;
248 if (kstrtoul(buf
, 0, &val
) < 0)
251 if (!capable(CAP_SYS_ADMIN
))
255 * "no_msi" and "bus_flags" only affect what happens when a driver
256 * requests MSI or MSI-X. They don't affect any drivers that have
257 * already requested MSI or MSI-X.
261 dev_info(&pdev
->dev
, "MSI/MSI-X %s for future drivers\n",
262 val
? "allowed" : "disallowed");
267 subordinate
->bus_flags
&= ~PCI_BUS_FLAGS_NO_MSI
;
269 subordinate
->bus_flags
|= PCI_BUS_FLAGS_NO_MSI
;
271 dev_info(&subordinate
->dev
, "MSI/MSI-X %s for future drivers of devices on this bus\n",
272 val
? "allowed" : "disallowed");
275 static DEVICE_ATTR_RW(msi_bus
);
277 static ssize_t
bus_rescan_store(struct bus_type
*bus
, const char *buf
,
281 struct pci_bus
*b
= NULL
;
283 if (kstrtoul(buf
, 0, &val
) < 0)
287 pci_lock_rescan_remove();
288 while ((b
= pci_find_next_bus(b
)) != NULL
)
290 pci_unlock_rescan_remove();
294 static BUS_ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, bus_rescan_store
);
296 static struct attribute
*pci_bus_attrs
[] = {
297 &bus_attr_rescan
.attr
,
301 static const struct attribute_group pci_bus_group
= {
302 .attrs
= pci_bus_attrs
,
305 const struct attribute_group
*pci_bus_groups
[] = {
310 static ssize_t
dev_rescan_store(struct device
*dev
,
311 struct device_attribute
*attr
, const char *buf
,
315 struct pci_dev
*pdev
= to_pci_dev(dev
);
317 if (kstrtoul(buf
, 0, &val
) < 0)
321 pci_lock_rescan_remove();
322 pci_rescan_bus(pdev
->bus
);
323 pci_unlock_rescan_remove();
327 static struct device_attribute dev_rescan_attr
= __ATTR(rescan
,
329 NULL
, dev_rescan_store
);
331 static ssize_t
remove_store(struct device
*dev
, struct device_attribute
*attr
,
332 const char *buf
, size_t count
)
336 if (kstrtoul(buf
, 0, &val
) < 0)
339 if (val
&& device_remove_file_self(dev
, attr
))
340 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev
));
343 static struct device_attribute dev_remove_attr
= __ATTR(remove
,
347 static ssize_t
dev_bus_rescan_store(struct device
*dev
,
348 struct device_attribute
*attr
,
349 const char *buf
, size_t count
)
352 struct pci_bus
*bus
= to_pci_bus(dev
);
354 if (kstrtoul(buf
, 0, &val
) < 0)
358 pci_lock_rescan_remove();
359 if (!pci_is_root_bus(bus
) && list_empty(&bus
->devices
))
360 pci_rescan_bus_bridge_resize(bus
->self
);
363 pci_unlock_rescan_remove();
367 static DEVICE_ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, dev_bus_rescan_store
);
369 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
370 static ssize_t
d3cold_allowed_store(struct device
*dev
,
371 struct device_attribute
*attr
,
372 const char *buf
, size_t count
)
374 struct pci_dev
*pdev
= to_pci_dev(dev
);
377 if (kstrtoul(buf
, 0, &val
) < 0)
380 pdev
->d3cold_allowed
= !!val
;
381 pm_runtime_resume(dev
);
386 static ssize_t
d3cold_allowed_show(struct device
*dev
,
387 struct device_attribute
*attr
, char *buf
)
389 struct pci_dev
*pdev
= to_pci_dev(dev
);
390 return sprintf(buf
, "%u\n", pdev
->d3cold_allowed
);
392 static DEVICE_ATTR_RW(d3cold_allowed
);
396 static ssize_t
devspec_show(struct device
*dev
,
397 struct device_attribute
*attr
, char *buf
)
399 struct pci_dev
*pdev
= to_pci_dev(dev
);
400 struct device_node
*np
= pci_device_to_OF_node(pdev
);
402 if (np
== NULL
|| np
->full_name
== NULL
)
404 return sprintf(buf
, "%s", np
->full_name
);
406 static DEVICE_ATTR_RO(devspec
);
409 #ifdef CONFIG_PCI_IOV
410 static ssize_t
sriov_totalvfs_show(struct device
*dev
,
411 struct device_attribute
*attr
,
414 struct pci_dev
*pdev
= to_pci_dev(dev
);
416 return sprintf(buf
, "%u\n", pci_sriov_get_totalvfs(pdev
));
420 static ssize_t
sriov_numvfs_show(struct device
*dev
,
421 struct device_attribute
*attr
,
424 struct pci_dev
*pdev
= to_pci_dev(dev
);
426 return sprintf(buf
, "%u\n", pdev
->sriov
->num_VFs
);
430 * num_vfs > 0; number of VFs to enable
431 * num_vfs = 0; disable all VFs
433 * Note: SRIOV spec doesn't allow partial VF
434 * disable, so it's all or none.
436 static ssize_t
sriov_numvfs_store(struct device
*dev
,
437 struct device_attribute
*attr
,
438 const char *buf
, size_t count
)
440 struct pci_dev
*pdev
= to_pci_dev(dev
);
444 ret
= kstrtou16(buf
, 0, &num_vfs
);
448 if (num_vfs
> pci_sriov_get_totalvfs(pdev
))
451 if (num_vfs
== pdev
->sriov
->num_VFs
)
452 return count
; /* no change */
454 /* is PF driver loaded w/callback */
455 if (!pdev
->driver
|| !pdev
->driver
->sriov_configure
) {
456 dev_info(&pdev
->dev
, "Driver doesn't support SRIOV configuration via sysfs\n");
462 ret
= pdev
->driver
->sriov_configure(pdev
, 0);
469 if (pdev
->sriov
->num_VFs
) {
470 dev_warn(&pdev
->dev
, "%d VFs already enabled. Disable before enabling %d VFs\n",
471 pdev
->sriov
->num_VFs
, num_vfs
);
475 ret
= pdev
->driver
->sriov_configure(pdev
, num_vfs
);
480 dev_warn(&pdev
->dev
, "%d VFs requested; only %d enabled\n",
486 static struct device_attribute sriov_totalvfs_attr
= __ATTR_RO(sriov_totalvfs
);
487 static struct device_attribute sriov_numvfs_attr
=
488 __ATTR(sriov_numvfs
, (S_IRUGO
|S_IWUSR
|S_IWGRP
),
489 sriov_numvfs_show
, sriov_numvfs_store
);
490 #endif /* CONFIG_PCI_IOV */
492 static ssize_t
driver_override_store(struct device
*dev
,
493 struct device_attribute
*attr
,
494 const char *buf
, size_t count
)
496 struct pci_dev
*pdev
= to_pci_dev(dev
);
497 char *driver_override
, *old
= pdev
->driver_override
, *cp
;
499 if (count
> PATH_MAX
)
502 driver_override
= kstrndup(buf
, count
, GFP_KERNEL
);
503 if (!driver_override
)
506 cp
= strchr(driver_override
, '\n');
510 if (strlen(driver_override
)) {
511 pdev
->driver_override
= driver_override
;
513 kfree(driver_override
);
514 pdev
->driver_override
= NULL
;
522 static ssize_t
driver_override_show(struct device
*dev
,
523 struct device_attribute
*attr
, char *buf
)
525 struct pci_dev
*pdev
= to_pci_dev(dev
);
527 return sprintf(buf
, "%s\n", pdev
->driver_override
);
529 static DEVICE_ATTR_RW(driver_override
);
531 static struct attribute
*pci_dev_attrs
[] = {
532 &dev_attr_resource
.attr
,
533 &dev_attr_vendor
.attr
,
534 &dev_attr_device
.attr
,
535 &dev_attr_subsystem_vendor
.attr
,
536 &dev_attr_subsystem_device
.attr
,
537 &dev_attr_class
.attr
,
539 &dev_attr_local_cpus
.attr
,
540 &dev_attr_local_cpulist
.attr
,
541 &dev_attr_modalias
.attr
,
543 &dev_attr_numa_node
.attr
,
545 &dev_attr_dma_mask_bits
.attr
,
546 &dev_attr_consistent_dma_mask_bits
.attr
,
547 &dev_attr_enable
.attr
,
548 &dev_attr_broken_parity_status
.attr
,
549 &dev_attr_msi_bus
.attr
,
550 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
551 &dev_attr_d3cold_allowed
.attr
,
554 &dev_attr_devspec
.attr
,
556 &dev_attr_driver_override
.attr
,
560 static const struct attribute_group pci_dev_group
= {
561 .attrs
= pci_dev_attrs
,
564 const struct attribute_group
*pci_dev_groups
[] = {
569 static struct attribute
*pcibus_attrs
[] = {
570 &dev_attr_rescan
.attr
,
571 &dev_attr_cpuaffinity
.attr
,
572 &dev_attr_cpulistaffinity
.attr
,
576 static const struct attribute_group pcibus_group
= {
577 .attrs
= pcibus_attrs
,
580 const struct attribute_group
*pcibus_groups
[] = {
585 static ssize_t
boot_vga_show(struct device
*dev
, struct device_attribute
*attr
,
588 struct pci_dev
*pdev
= to_pci_dev(dev
);
589 struct pci_dev
*vga_dev
= vga_default_device();
592 return sprintf(buf
, "%u\n", (pdev
== vga_dev
));
594 return sprintf(buf
, "%u\n",
595 !!(pdev
->resource
[PCI_ROM_RESOURCE
].flags
&
596 IORESOURCE_ROM_SHADOW
));
598 static struct device_attribute vga_attr
= __ATTR_RO(boot_vga
);
600 static ssize_t
pci_read_config(struct file
*filp
, struct kobject
*kobj
,
601 struct bin_attribute
*bin_attr
, char *buf
,
602 loff_t off
, size_t count
)
604 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
, struct device
,
606 unsigned int size
= 64;
607 loff_t init_off
= off
;
608 u8
*data
= (u8
*) buf
;
610 /* Several chips lock up trying to read undefined config space */
611 if (security_capable(filp
->f_cred
, &init_user_ns
, CAP_SYS_ADMIN
) == 0)
612 size
= dev
->cfg_size
;
613 else if (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
)
618 if (off
+ count
> size
) {
625 pci_config_pm_runtime_get(dev
);
627 if ((off
& 1) && size
) {
629 pci_user_read_config_byte(dev
, off
, &val
);
630 data
[off
- init_off
] = val
;
635 if ((off
& 3) && size
> 2) {
637 pci_user_read_config_word(dev
, off
, &val
);
638 data
[off
- init_off
] = val
& 0xff;
639 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
646 pci_user_read_config_dword(dev
, off
, &val
);
647 data
[off
- init_off
] = val
& 0xff;
648 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
649 data
[off
- init_off
+ 2] = (val
>> 16) & 0xff;
650 data
[off
- init_off
+ 3] = (val
>> 24) & 0xff;
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_byte(dev
, off
, &val
);
667 data
[off
- init_off
] = val
;
672 pci_config_pm_runtime_put(dev
);
677 static ssize_t
pci_write_config(struct file
*filp
, struct kobject
*kobj
,
678 struct bin_attribute
*bin_attr
, char *buf
,
679 loff_t off
, size_t count
)
681 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
, struct device
,
683 unsigned int size
= count
;
684 loff_t init_off
= off
;
685 u8
*data
= (u8
*) buf
;
687 if (off
> dev
->cfg_size
)
689 if (off
+ count
> dev
->cfg_size
) {
690 size
= dev
->cfg_size
- off
;
694 pci_config_pm_runtime_get(dev
);
696 if ((off
& 1) && size
) {
697 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
702 if ((off
& 3) && size
> 2) {
703 u16 val
= data
[off
- init_off
];
704 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
705 pci_user_write_config_word(dev
, off
, val
);
711 u32 val
= data
[off
- init_off
];
712 val
|= (u32
) data
[off
- init_off
+ 1] << 8;
713 val
|= (u32
) data
[off
- init_off
+ 2] << 16;
714 val
|= (u32
) data
[off
- init_off
+ 3] << 24;
715 pci_user_write_config_dword(dev
, off
, val
);
721 u16 val
= data
[off
- init_off
];
722 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
723 pci_user_write_config_word(dev
, off
, val
);
729 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
734 pci_config_pm_runtime_put(dev
);
739 static ssize_t
read_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
740 struct bin_attribute
*bin_attr
, char *buf
,
741 loff_t off
, size_t count
)
743 struct pci_dev
*dev
=
744 to_pci_dev(container_of(kobj
, struct device
, kobj
));
746 if (off
> bin_attr
->size
)
748 else if (count
> bin_attr
->size
- off
)
749 count
= bin_attr
->size
- off
;
751 return pci_read_vpd(dev
, off
, count
, buf
);
754 static ssize_t
write_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
755 struct bin_attribute
*bin_attr
, char *buf
,
756 loff_t off
, size_t count
)
758 struct pci_dev
*dev
=
759 to_pci_dev(container_of(kobj
, struct device
, kobj
));
761 if (off
> bin_attr
->size
)
763 else if (count
> bin_attr
->size
- off
)
764 count
= bin_attr
->size
- off
;
766 return pci_write_vpd(dev
, off
, count
, buf
);
769 #ifdef HAVE_PCI_LEGACY
771 * pci_read_legacy_io - read byte(s) from legacy I/O port space
772 * @filp: open sysfs file
773 * @kobj: kobject corresponding to file to read from
774 * @bin_attr: struct bin_attribute for this file
775 * @buf: buffer to store results
776 * @off: offset into legacy I/O port space
777 * @count: number of bytes to read
779 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
780 * callback routine (pci_legacy_read).
782 static ssize_t
pci_read_legacy_io(struct file
*filp
, struct kobject
*kobj
,
783 struct bin_attribute
*bin_attr
, char *buf
,
784 loff_t off
, size_t count
)
786 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
789 /* Only support 1, 2 or 4 byte accesses */
790 if (count
!= 1 && count
!= 2 && count
!= 4)
793 return pci_legacy_read(bus
, off
, (u32
*)buf
, count
);
797 * pci_write_legacy_io - write byte(s) to legacy I/O port space
798 * @filp: open sysfs file
799 * @kobj: kobject corresponding to file to read from
800 * @bin_attr: struct bin_attribute for this file
801 * @buf: buffer containing value to be written
802 * @off: offset into legacy I/O port space
803 * @count: number of bytes to write
805 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
806 * callback routine (pci_legacy_write).
808 static ssize_t
pci_write_legacy_io(struct file
*filp
, struct kobject
*kobj
,
809 struct bin_attribute
*bin_attr
, char *buf
,
810 loff_t off
, size_t count
)
812 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
815 /* Only support 1, 2 or 4 byte accesses */
816 if (count
!= 1 && count
!= 2 && count
!= 4)
819 return pci_legacy_write(bus
, off
, *(u32
*)buf
, count
);
823 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
824 * @filp: open sysfs file
825 * @kobj: kobject corresponding to device to be mapped
826 * @attr: struct bin_attribute for this file
827 * @vma: struct vm_area_struct passed to mmap
829 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
830 * legacy memory space (first meg of bus space) into application virtual
833 static int pci_mmap_legacy_mem(struct file
*filp
, struct kobject
*kobj
,
834 struct bin_attribute
*attr
,
835 struct vm_area_struct
*vma
)
837 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
840 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_mem
);
844 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
845 * @filp: open sysfs file
846 * @kobj: kobject corresponding to device to be mapped
847 * @attr: struct bin_attribute for this file
848 * @vma: struct vm_area_struct passed to mmap
850 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
851 * legacy IO space (first meg of bus space) into application virtual
852 * memory space. Returns -ENOSYS if the operation isn't supported
854 static int pci_mmap_legacy_io(struct file
*filp
, struct kobject
*kobj
,
855 struct bin_attribute
*attr
,
856 struct vm_area_struct
*vma
)
858 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
861 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_io
);
865 * pci_adjust_legacy_attr - adjustment of legacy file attributes
866 * @b: bus to create files under
867 * @mmap_type: I/O port or memory
869 * Stub implementation. Can be overridden by arch if necessary.
871 void __weak
pci_adjust_legacy_attr(struct pci_bus
*b
,
872 enum pci_mmap_state mmap_type
)
877 * pci_create_legacy_files - create legacy I/O port and memory files
878 * @b: bus to create files under
880 * Some platforms allow access to legacy I/O port and ISA memory space on
881 * a per-bus basis. This routine creates the files and ties them into
882 * their associated read, write and mmap files from pci-sysfs.c
884 * On error unwind, but don't propagate the error to the caller
885 * as it is ok to set up the PCI bus without these files.
887 void pci_create_legacy_files(struct pci_bus
*b
)
891 b
->legacy_io
= kzalloc(sizeof(struct bin_attribute
) * 2,
896 sysfs_bin_attr_init(b
->legacy_io
);
897 b
->legacy_io
->attr
.name
= "legacy_io";
898 b
->legacy_io
->size
= 0xffff;
899 b
->legacy_io
->attr
.mode
= S_IRUSR
| S_IWUSR
;
900 b
->legacy_io
->read
= pci_read_legacy_io
;
901 b
->legacy_io
->write
= pci_write_legacy_io
;
902 b
->legacy_io
->mmap
= pci_mmap_legacy_io
;
903 pci_adjust_legacy_attr(b
, pci_mmap_io
);
904 error
= device_create_bin_file(&b
->dev
, b
->legacy_io
);
908 /* Allocated above after the legacy_io struct */
909 b
->legacy_mem
= b
->legacy_io
+ 1;
910 sysfs_bin_attr_init(b
->legacy_mem
);
911 b
->legacy_mem
->attr
.name
= "legacy_mem";
912 b
->legacy_mem
->size
= 1024*1024;
913 b
->legacy_mem
->attr
.mode
= S_IRUSR
| S_IWUSR
;
914 b
->legacy_mem
->mmap
= pci_mmap_legacy_mem
;
915 pci_adjust_legacy_attr(b
, pci_mmap_mem
);
916 error
= device_create_bin_file(&b
->dev
, b
->legacy_mem
);
923 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
928 printk(KERN_WARNING
"pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
932 void pci_remove_legacy_files(struct pci_bus
*b
)
935 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
936 device_remove_bin_file(&b
->dev
, b
->legacy_mem
);
937 kfree(b
->legacy_io
); /* both are allocated here */
940 #endif /* HAVE_PCI_LEGACY */
944 int pci_mmap_fits(struct pci_dev
*pdev
, int resno
, struct vm_area_struct
*vma
,
945 enum pci_mmap_api mmap_api
)
947 unsigned long nr
, start
, size
, pci_start
;
949 if (pci_resource_len(pdev
, resno
) == 0)
952 start
= vma
->vm_pgoff
;
953 size
= ((pci_resource_len(pdev
, resno
) - 1) >> PAGE_SHIFT
) + 1;
954 pci_start
= (mmap_api
== PCI_MMAP_PROCFS
) ?
955 pci_resource_start(pdev
, resno
) >> PAGE_SHIFT
: 0;
956 if (start
>= pci_start
&& start
< pci_start
+ size
&&
957 start
+ nr
<= pci_start
+ size
)
963 * pci_mmap_resource - map a PCI resource into user memory space
964 * @kobj: kobject for mapping
965 * @attr: struct bin_attribute for the file being mapped
966 * @vma: struct vm_area_struct passed into the mmap
967 * @write_combine: 1 for write_combine mapping
969 * Use the regular PCI mapping routines to map a PCI resource into userspace.
971 static int pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
972 struct vm_area_struct
*vma
, int write_combine
)
974 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
975 struct device
, kobj
));
976 struct resource
*res
= attr
->private;
977 enum pci_mmap_state mmap_type
;
978 resource_size_t start
, end
;
981 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
982 if (res
== &pdev
->resource
[i
])
984 if (i
>= PCI_ROM_RESOURCE
)
987 if (!pci_mmap_fits(pdev
, i
, vma
, PCI_MMAP_SYSFS
)) {
988 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",
989 current
->comm
, vma
->vm_end
-vma
->vm_start
, vma
->vm_pgoff
,
991 (u64
)pci_resource_start(pdev
, i
),
992 (u64
)pci_resource_len(pdev
, i
));
996 /* pci_mmap_page_range() expects the same kind of entry as coming
997 * from /proc/bus/pci/ which is a "user visible" value. If this is
998 * different from the resource itself, arch will do necessary fixup.
1000 pci_resource_to_user(pdev
, i
, res
, &start
, &end
);
1001 vma
->vm_pgoff
+= start
>> PAGE_SHIFT
;
1002 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
1004 if (res
->flags
& IORESOURCE_MEM
&& iomem_is_exclusive(start
))
1007 return pci_mmap_page_range(pdev
, vma
, mmap_type
, write_combine
);
1010 static int pci_mmap_resource_uc(struct file
*filp
, struct kobject
*kobj
,
1011 struct bin_attribute
*attr
,
1012 struct vm_area_struct
*vma
)
1014 return pci_mmap_resource(kobj
, attr
, vma
, 0);
1017 static int pci_mmap_resource_wc(struct file
*filp
, struct kobject
*kobj
,
1018 struct bin_attribute
*attr
,
1019 struct vm_area_struct
*vma
)
1021 return pci_mmap_resource(kobj
, attr
, vma
, 1);
1024 static ssize_t
pci_resource_io(struct file
*filp
, struct kobject
*kobj
,
1025 struct bin_attribute
*attr
, char *buf
,
1026 loff_t off
, size_t count
, bool write
)
1028 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
1029 struct device
, kobj
));
1030 struct resource
*res
= attr
->private;
1031 unsigned long port
= off
;
1034 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
1035 if (res
== &pdev
->resource
[i
])
1037 if (i
>= PCI_ROM_RESOURCE
)
1040 port
+= pci_resource_start(pdev
, i
);
1042 if (port
> pci_resource_end(pdev
, i
))
1045 if (port
+ count
- 1 > pci_resource_end(pdev
, i
))
1051 outb(*(u8
*)buf
, port
);
1053 *(u8
*)buf
= inb(port
);
1057 outw(*(u16
*)buf
, port
);
1059 *(u16
*)buf
= inw(port
);
1063 outl(*(u32
*)buf
, port
);
1065 *(u32
*)buf
= inl(port
);
1071 static ssize_t
pci_read_resource_io(struct file
*filp
, struct kobject
*kobj
,
1072 struct bin_attribute
*attr
, char *buf
,
1073 loff_t off
, size_t count
)
1075 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, false);
1078 static ssize_t
pci_write_resource_io(struct file
*filp
, struct kobject
*kobj
,
1079 struct bin_attribute
*attr
, char *buf
,
1080 loff_t off
, size_t count
)
1082 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, true);
1086 * pci_remove_resource_files - cleanup resource files
1087 * @pdev: dev to cleanup
1089 * If we created resource files for @pdev, remove them from sysfs and
1090 * free their resources.
1092 static void pci_remove_resource_files(struct pci_dev
*pdev
)
1096 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1097 struct bin_attribute
*res_attr
;
1099 res_attr
= pdev
->res_attr
[i
];
1101 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1105 res_attr
= pdev
->res_attr_wc
[i
];
1107 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1113 static int pci_create_attr(struct pci_dev
*pdev
, int num
, int write_combine
)
1115 /* allocate attribute structure, piggyback attribute name */
1116 int name_len
= write_combine
? 13 : 10;
1117 struct bin_attribute
*res_attr
;
1120 res_attr
= kzalloc(sizeof(*res_attr
) + name_len
, GFP_ATOMIC
);
1122 char *res_attr_name
= (char *)(res_attr
+ 1);
1124 sysfs_bin_attr_init(res_attr
);
1125 if (write_combine
) {
1126 pdev
->res_attr_wc
[num
] = res_attr
;
1127 sprintf(res_attr_name
, "resource%d_wc", num
);
1128 res_attr
->mmap
= pci_mmap_resource_wc
;
1130 pdev
->res_attr
[num
] = res_attr
;
1131 sprintf(res_attr_name
, "resource%d", num
);
1132 res_attr
->mmap
= pci_mmap_resource_uc
;
1134 if (pci_resource_flags(pdev
, num
) & IORESOURCE_IO
) {
1135 res_attr
->read
= pci_read_resource_io
;
1136 res_attr
->write
= pci_write_resource_io
;
1138 res_attr
->attr
.name
= res_attr_name
;
1139 res_attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1140 res_attr
->size
= pci_resource_len(pdev
, num
);
1141 res_attr
->private = &pdev
->resource
[num
];
1142 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
1150 * pci_create_resource_files - create resource files in sysfs for @dev
1151 * @pdev: dev in question
1153 * Walk the resources in @pdev creating files for each resource available.
1155 static int pci_create_resource_files(struct pci_dev
*pdev
)
1160 /* Expose the PCI resources from this device as files */
1161 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1163 /* skip empty resources */
1164 if (!pci_resource_len(pdev
, i
))
1167 retval
= pci_create_attr(pdev
, i
, 0);
1168 /* for prefetchable resources, create a WC mappable file */
1169 if (!retval
&& pdev
->resource
[i
].flags
& IORESOURCE_PREFETCH
)
1170 retval
= pci_create_attr(pdev
, i
, 1);
1173 pci_remove_resource_files(pdev
);
1179 #else /* !HAVE_PCI_MMAP */
1180 int __weak
pci_create_resource_files(struct pci_dev
*dev
) { return 0; }
1181 void __weak
pci_remove_resource_files(struct pci_dev
*dev
) { return; }
1182 #endif /* HAVE_PCI_MMAP */
1185 * pci_write_rom - used to enable access to the PCI ROM display
1187 * @kobj: kernel object handle
1188 * @bin_attr: struct bin_attribute for this file
1191 * @count: number of byte in input
1193 * writing anything except 0 enables it
1195 static ssize_t
pci_write_rom(struct file
*filp
, struct kobject
*kobj
,
1196 struct bin_attribute
*bin_attr
, char *buf
,
1197 loff_t off
, size_t count
)
1199 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1201 if ((off
== 0) && (*buf
== '0') && (count
== 2))
1202 pdev
->rom_attr_enabled
= 0;
1204 pdev
->rom_attr_enabled
= 1;
1210 * pci_read_rom - read a PCI ROM
1212 * @kobj: kernel object handle
1213 * @bin_attr: struct bin_attribute for this file
1214 * @buf: where to put the data we read from the ROM
1216 * @count: number of bytes to read
1218 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1219 * device corresponding to @kobj.
1221 static ssize_t
pci_read_rom(struct file
*filp
, struct kobject
*kobj
,
1222 struct bin_attribute
*bin_attr
, char *buf
,
1223 loff_t off
, size_t count
)
1225 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1229 if (!pdev
->rom_attr_enabled
)
1232 rom
= pci_map_rom(pdev
, &size
); /* size starts out as PCI window size */
1239 if (off
+ count
> size
)
1242 memcpy_fromio(buf
, rom
+ off
, count
);
1244 pci_unmap_rom(pdev
, rom
);
1249 static struct bin_attribute pci_config_attr
= {
1252 .mode
= S_IRUGO
| S_IWUSR
,
1254 .size
= PCI_CFG_SPACE_SIZE
,
1255 .read
= pci_read_config
,
1256 .write
= pci_write_config
,
1259 static struct bin_attribute pcie_config_attr
= {
1262 .mode
= S_IRUGO
| S_IWUSR
,
1264 .size
= PCI_CFG_SPACE_EXP_SIZE
,
1265 .read
= pci_read_config
,
1266 .write
= pci_write_config
,
1269 static ssize_t
reset_store(struct device
*dev
, struct device_attribute
*attr
,
1270 const char *buf
, size_t count
)
1272 struct pci_dev
*pdev
= to_pci_dev(dev
);
1274 ssize_t result
= kstrtoul(buf
, 0, &val
);
1282 result
= pci_reset_function(pdev
);
1289 static struct device_attribute reset_attr
= __ATTR(reset
, 0200, NULL
, reset_store
);
1291 static int pci_create_capabilities_sysfs(struct pci_dev
*dev
)
1294 struct bin_attribute
*attr
;
1296 /* If the device has VPD, try to expose it in sysfs. */
1298 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1302 sysfs_bin_attr_init(attr
);
1303 attr
->size
= dev
->vpd
->len
;
1304 attr
->attr
.name
= "vpd";
1305 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1306 attr
->read
= read_vpd_attr
;
1307 attr
->write
= write_vpd_attr
;
1308 retval
= sysfs_create_bin_file(&dev
->dev
.kobj
, attr
);
1313 dev
->vpd
->attr
= attr
;
1316 /* Active State Power Management */
1317 pcie_aspm_create_sysfs_dev_files(dev
);
1319 if (!pci_probe_reset_function(dev
)) {
1320 retval
= device_create_file(&dev
->dev
, &reset_attr
);
1328 pcie_aspm_remove_sysfs_dev_files(dev
);
1329 if (dev
->vpd
&& dev
->vpd
->attr
) {
1330 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1331 kfree(dev
->vpd
->attr
);
1337 int __must_check
pci_create_sysfs_dev_files(struct pci_dev
*pdev
)
1341 struct bin_attribute
*attr
;
1343 if (!sysfs_initialized
)
1346 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1347 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1349 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1353 retval
= pci_create_resource_files(pdev
);
1355 goto err_config_file
;
1357 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1358 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1359 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1362 /* If the device has a ROM, try to expose it in sysfs. */
1364 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1367 goto err_resource_files
;
1369 sysfs_bin_attr_init(attr
);
1370 attr
->size
= rom_size
;
1371 attr
->attr
.name
= "rom";
1372 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1373 attr
->read
= pci_read_rom
;
1374 attr
->write
= pci_write_rom
;
1375 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, attr
);
1378 goto err_resource_files
;
1380 pdev
->rom_attr
= attr
;
1383 /* add sysfs entries for various capabilities */
1384 retval
= pci_create_capabilities_sysfs(pdev
);
1388 pci_create_firmware_label_files(pdev
);
1394 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1395 kfree(pdev
->rom_attr
);
1396 pdev
->rom_attr
= NULL
;
1399 pci_remove_resource_files(pdev
);
1401 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1402 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1404 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1409 static void pci_remove_capabilities_sysfs(struct pci_dev
*dev
)
1411 if (dev
->vpd
&& dev
->vpd
->attr
) {
1412 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1413 kfree(dev
->vpd
->attr
);
1416 pcie_aspm_remove_sysfs_dev_files(dev
);
1417 if (dev
->reset_fn
) {
1418 device_remove_file(&dev
->dev
, &reset_attr
);
1424 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1425 * @pdev: device whose entries we should free
1427 * Cleanup when @pdev is removed from sysfs.
1429 void pci_remove_sysfs_dev_files(struct pci_dev
*pdev
)
1433 if (!sysfs_initialized
)
1436 pci_remove_capabilities_sysfs(pdev
);
1438 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1439 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1441 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1443 pci_remove_resource_files(pdev
);
1445 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1446 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1447 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1450 if (rom_size
&& pdev
->rom_attr
) {
1451 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1452 kfree(pdev
->rom_attr
);
1455 pci_remove_firmware_label_files(pdev
);
1459 static int __init
pci_sysfs_init(void)
1461 struct pci_dev
*pdev
= NULL
;
1464 sysfs_initialized
= 1;
1465 for_each_pci_dev(pdev
) {
1466 retval
= pci_create_sysfs_dev_files(pdev
);
1475 late_initcall(pci_sysfs_init
);
1477 static struct attribute
*pci_dev_dev_attrs
[] = {
1482 static umode_t
pci_dev_attrs_are_visible(struct kobject
*kobj
,
1483 struct attribute
*a
, int n
)
1485 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1486 struct pci_dev
*pdev
= to_pci_dev(dev
);
1488 if (a
== &vga_attr
.attr
)
1489 if ((pdev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
1495 static struct attribute
*pci_dev_hp_attrs
[] = {
1496 &dev_remove_attr
.attr
,
1497 &dev_rescan_attr
.attr
,
1501 static umode_t
pci_dev_hp_attrs_are_visible(struct kobject
*kobj
,
1502 struct attribute
*a
, int n
)
1504 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1505 struct pci_dev
*pdev
= to_pci_dev(dev
);
1507 if (pdev
->is_virtfn
)
1513 static struct attribute_group pci_dev_hp_attr_group
= {
1514 .attrs
= pci_dev_hp_attrs
,
1515 .is_visible
= pci_dev_hp_attrs_are_visible
,
1518 #ifdef CONFIG_PCI_IOV
1519 static struct attribute
*sriov_dev_attrs
[] = {
1520 &sriov_totalvfs_attr
.attr
,
1521 &sriov_numvfs_attr
.attr
,
1525 static umode_t
sriov_attrs_are_visible(struct kobject
*kobj
,
1526 struct attribute
*a
, int n
)
1528 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1530 if (!dev_is_pf(dev
))
1536 static struct attribute_group sriov_dev_attr_group
= {
1537 .attrs
= sriov_dev_attrs
,
1538 .is_visible
= sriov_attrs_are_visible
,
1540 #endif /* CONFIG_PCI_IOV */
1542 static struct attribute_group pci_dev_attr_group
= {
1543 .attrs
= pci_dev_dev_attrs
,
1544 .is_visible
= pci_dev_attrs_are_visible
,
1547 static const struct attribute_group
*pci_dev_attr_groups
[] = {
1548 &pci_dev_attr_group
,
1549 &pci_dev_hp_attr_group
,
1550 #ifdef CONFIG_PCI_IOV
1551 &sriov_dev_attr_group
,
1556 struct device_type pci_dev_type
= {
1557 .groups
= pci_dev_attr_groups
,