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_store(struct device
*dev
,
206 struct device_attribute
*attr
, const char *buf
,
209 struct pci_dev
*pdev
= to_pci_dev(dev
);
212 if (!capable(CAP_SYS_ADMIN
))
215 ret
= kstrtoint(buf
, 0, &node
);
219 if (!node_online(node
))
222 add_taint(TAINT_FIRMWARE_WORKAROUND
, LOCKDEP_STILL_OK
);
223 dev_alert(&pdev
->dev
, FW_BUG
"Overriding NUMA node to %d. Contact your vendor for updates.",
226 dev
->numa_node
= node
;
230 static ssize_t
numa_node_show(struct device
*dev
, struct device_attribute
*attr
,
233 return sprintf(buf
, "%d\n", dev
->numa_node
);
235 static DEVICE_ATTR_RW(numa_node
);
238 static ssize_t
dma_mask_bits_show(struct device
*dev
,
239 struct device_attribute
*attr
, char *buf
)
241 struct pci_dev
*pdev
= to_pci_dev(dev
);
243 return sprintf(buf
, "%d\n", fls64(pdev
->dma_mask
));
245 static DEVICE_ATTR_RO(dma_mask_bits
);
247 static ssize_t
consistent_dma_mask_bits_show(struct device
*dev
,
248 struct device_attribute
*attr
,
251 return sprintf(buf
, "%d\n", fls64(dev
->coherent_dma_mask
));
253 static DEVICE_ATTR_RO(consistent_dma_mask_bits
);
255 static ssize_t
msi_bus_show(struct device
*dev
, struct device_attribute
*attr
,
258 struct pci_dev
*pdev
= to_pci_dev(dev
);
259 struct pci_bus
*subordinate
= pdev
->subordinate
;
261 return sprintf(buf
, "%u\n", subordinate
?
262 !(subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
)
266 static ssize_t
msi_bus_store(struct device
*dev
, struct device_attribute
*attr
,
267 const char *buf
, size_t count
)
269 struct pci_dev
*pdev
= to_pci_dev(dev
);
270 struct pci_bus
*subordinate
= pdev
->subordinate
;
273 if (kstrtoul(buf
, 0, &val
) < 0)
276 if (!capable(CAP_SYS_ADMIN
))
280 * "no_msi" and "bus_flags" only affect what happens when a driver
281 * requests MSI or MSI-X. They don't affect any drivers that have
282 * already requested MSI or MSI-X.
286 dev_info(&pdev
->dev
, "MSI/MSI-X %s for future drivers\n",
287 val
? "allowed" : "disallowed");
292 subordinate
->bus_flags
&= ~PCI_BUS_FLAGS_NO_MSI
;
294 subordinate
->bus_flags
|= PCI_BUS_FLAGS_NO_MSI
;
296 dev_info(&subordinate
->dev
, "MSI/MSI-X %s for future drivers of devices on this bus\n",
297 val
? "allowed" : "disallowed");
300 static DEVICE_ATTR_RW(msi_bus
);
302 static ssize_t
bus_rescan_store(struct bus_type
*bus
, const char *buf
,
306 struct pci_bus
*b
= NULL
;
308 if (kstrtoul(buf
, 0, &val
) < 0)
312 pci_lock_rescan_remove();
313 while ((b
= pci_find_next_bus(b
)) != NULL
)
315 pci_unlock_rescan_remove();
319 static BUS_ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, bus_rescan_store
);
321 static struct attribute
*pci_bus_attrs
[] = {
322 &bus_attr_rescan
.attr
,
326 static const struct attribute_group pci_bus_group
= {
327 .attrs
= pci_bus_attrs
,
330 const struct attribute_group
*pci_bus_groups
[] = {
335 static ssize_t
dev_rescan_store(struct device
*dev
,
336 struct device_attribute
*attr
, const char *buf
,
340 struct pci_dev
*pdev
= to_pci_dev(dev
);
342 if (kstrtoul(buf
, 0, &val
) < 0)
346 pci_lock_rescan_remove();
347 pci_rescan_bus(pdev
->bus
);
348 pci_unlock_rescan_remove();
352 static struct device_attribute dev_rescan_attr
= __ATTR(rescan
,
354 NULL
, dev_rescan_store
);
356 static ssize_t
remove_store(struct device
*dev
, struct device_attribute
*attr
,
357 const char *buf
, size_t count
)
361 if (kstrtoul(buf
, 0, &val
) < 0)
364 if (val
&& device_remove_file_self(dev
, attr
))
365 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev
));
368 static struct device_attribute dev_remove_attr
= __ATTR(remove
,
372 static ssize_t
dev_bus_rescan_store(struct device
*dev
,
373 struct device_attribute
*attr
,
374 const char *buf
, size_t count
)
377 struct pci_bus
*bus
= to_pci_bus(dev
);
379 if (kstrtoul(buf
, 0, &val
) < 0)
383 pci_lock_rescan_remove();
384 if (!pci_is_root_bus(bus
) && list_empty(&bus
->devices
))
385 pci_rescan_bus_bridge_resize(bus
->self
);
388 pci_unlock_rescan_remove();
392 static DEVICE_ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, dev_bus_rescan_store
);
394 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
395 static ssize_t
d3cold_allowed_store(struct device
*dev
,
396 struct device_attribute
*attr
,
397 const char *buf
, size_t count
)
399 struct pci_dev
*pdev
= to_pci_dev(dev
);
402 if (kstrtoul(buf
, 0, &val
) < 0)
405 pdev
->d3cold_allowed
= !!val
;
406 pm_runtime_resume(dev
);
411 static ssize_t
d3cold_allowed_show(struct device
*dev
,
412 struct device_attribute
*attr
, char *buf
)
414 struct pci_dev
*pdev
= to_pci_dev(dev
);
415 return sprintf(buf
, "%u\n", pdev
->d3cold_allowed
);
417 static DEVICE_ATTR_RW(d3cold_allowed
);
421 static ssize_t
devspec_show(struct device
*dev
,
422 struct device_attribute
*attr
, char *buf
)
424 struct pci_dev
*pdev
= to_pci_dev(dev
);
425 struct device_node
*np
= pci_device_to_OF_node(pdev
);
427 if (np
== NULL
|| np
->full_name
== NULL
)
429 return sprintf(buf
, "%s", np
->full_name
);
431 static DEVICE_ATTR_RO(devspec
);
434 #ifdef CONFIG_PCI_IOV
435 static ssize_t
sriov_totalvfs_show(struct device
*dev
,
436 struct device_attribute
*attr
,
439 struct pci_dev
*pdev
= to_pci_dev(dev
);
441 return sprintf(buf
, "%u\n", pci_sriov_get_totalvfs(pdev
));
445 static ssize_t
sriov_numvfs_show(struct device
*dev
,
446 struct device_attribute
*attr
,
449 struct pci_dev
*pdev
= to_pci_dev(dev
);
451 return sprintf(buf
, "%u\n", pdev
->sriov
->num_VFs
);
455 * num_vfs > 0; number of VFs to enable
456 * num_vfs = 0; disable all VFs
458 * Note: SRIOV spec doesn't allow partial VF
459 * disable, so it's all or none.
461 static ssize_t
sriov_numvfs_store(struct device
*dev
,
462 struct device_attribute
*attr
,
463 const char *buf
, size_t count
)
465 struct pci_dev
*pdev
= to_pci_dev(dev
);
469 ret
= kstrtou16(buf
, 0, &num_vfs
);
473 if (num_vfs
> pci_sriov_get_totalvfs(pdev
))
476 if (num_vfs
== pdev
->sriov
->num_VFs
)
477 return count
; /* no change */
479 /* is PF driver loaded w/callback */
480 if (!pdev
->driver
|| !pdev
->driver
->sriov_configure
) {
481 dev_info(&pdev
->dev
, "Driver doesn't support SRIOV configuration via sysfs\n");
487 ret
= pdev
->driver
->sriov_configure(pdev
, 0);
494 if (pdev
->sriov
->num_VFs
) {
495 dev_warn(&pdev
->dev
, "%d VFs already enabled. Disable before enabling %d VFs\n",
496 pdev
->sriov
->num_VFs
, num_vfs
);
500 ret
= pdev
->driver
->sriov_configure(pdev
, num_vfs
);
505 dev_warn(&pdev
->dev
, "%d VFs requested; only %d enabled\n",
511 static struct device_attribute sriov_totalvfs_attr
= __ATTR_RO(sriov_totalvfs
);
512 static struct device_attribute sriov_numvfs_attr
=
513 __ATTR(sriov_numvfs
, (S_IRUGO
|S_IWUSR
|S_IWGRP
),
514 sriov_numvfs_show
, sriov_numvfs_store
);
515 #endif /* CONFIG_PCI_IOV */
517 static ssize_t
driver_override_store(struct device
*dev
,
518 struct device_attribute
*attr
,
519 const char *buf
, size_t count
)
521 struct pci_dev
*pdev
= to_pci_dev(dev
);
522 char *driver_override
, *old
= pdev
->driver_override
, *cp
;
524 if (count
> PATH_MAX
)
527 driver_override
= kstrndup(buf
, count
, GFP_KERNEL
);
528 if (!driver_override
)
531 cp
= strchr(driver_override
, '\n');
535 if (strlen(driver_override
)) {
536 pdev
->driver_override
= driver_override
;
538 kfree(driver_override
);
539 pdev
->driver_override
= NULL
;
547 static ssize_t
driver_override_show(struct device
*dev
,
548 struct device_attribute
*attr
, char *buf
)
550 struct pci_dev
*pdev
= to_pci_dev(dev
);
552 return sprintf(buf
, "%s\n", pdev
->driver_override
);
554 static DEVICE_ATTR_RW(driver_override
);
556 static struct attribute
*pci_dev_attrs
[] = {
557 &dev_attr_resource
.attr
,
558 &dev_attr_vendor
.attr
,
559 &dev_attr_device
.attr
,
560 &dev_attr_subsystem_vendor
.attr
,
561 &dev_attr_subsystem_device
.attr
,
562 &dev_attr_class
.attr
,
564 &dev_attr_local_cpus
.attr
,
565 &dev_attr_local_cpulist
.attr
,
566 &dev_attr_modalias
.attr
,
568 &dev_attr_numa_node
.attr
,
570 &dev_attr_dma_mask_bits
.attr
,
571 &dev_attr_consistent_dma_mask_bits
.attr
,
572 &dev_attr_enable
.attr
,
573 &dev_attr_broken_parity_status
.attr
,
574 &dev_attr_msi_bus
.attr
,
575 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
576 &dev_attr_d3cold_allowed
.attr
,
579 &dev_attr_devspec
.attr
,
581 &dev_attr_driver_override
.attr
,
585 static const struct attribute_group pci_dev_group
= {
586 .attrs
= pci_dev_attrs
,
589 const struct attribute_group
*pci_dev_groups
[] = {
594 static struct attribute
*pcibus_attrs
[] = {
595 &dev_attr_rescan
.attr
,
596 &dev_attr_cpuaffinity
.attr
,
597 &dev_attr_cpulistaffinity
.attr
,
601 static const struct attribute_group pcibus_group
= {
602 .attrs
= pcibus_attrs
,
605 const struct attribute_group
*pcibus_groups
[] = {
610 static ssize_t
boot_vga_show(struct device
*dev
, struct device_attribute
*attr
,
613 struct pci_dev
*pdev
= to_pci_dev(dev
);
614 struct pci_dev
*vga_dev
= vga_default_device();
617 return sprintf(buf
, "%u\n", (pdev
== vga_dev
));
619 return sprintf(buf
, "%u\n",
620 !!(pdev
->resource
[PCI_ROM_RESOURCE
].flags
&
621 IORESOURCE_ROM_SHADOW
));
623 static struct device_attribute vga_attr
= __ATTR_RO(boot_vga
);
625 static ssize_t
pci_read_config(struct file
*filp
, struct kobject
*kobj
,
626 struct bin_attribute
*bin_attr
, char *buf
,
627 loff_t off
, size_t count
)
629 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
, struct device
,
631 unsigned int size
= 64;
632 loff_t init_off
= off
;
633 u8
*data
= (u8
*) buf
;
635 /* Several chips lock up trying to read undefined config space */
636 if (security_capable(filp
->f_cred
, &init_user_ns
, CAP_SYS_ADMIN
) == 0)
637 size
= dev
->cfg_size
;
638 else if (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
)
643 if (off
+ count
> size
) {
650 pci_config_pm_runtime_get(dev
);
652 if ((off
& 1) && size
) {
654 pci_user_read_config_byte(dev
, off
, &val
);
655 data
[off
- init_off
] = val
;
660 if ((off
& 3) && size
> 2) {
662 pci_user_read_config_word(dev
, off
, &val
);
663 data
[off
- init_off
] = val
& 0xff;
664 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
671 pci_user_read_config_dword(dev
, off
, &val
);
672 data
[off
- init_off
] = val
& 0xff;
673 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
674 data
[off
- init_off
+ 2] = (val
>> 16) & 0xff;
675 data
[off
- init_off
+ 3] = (val
>> 24) & 0xff;
682 pci_user_read_config_word(dev
, off
, &val
);
683 data
[off
- init_off
] = val
& 0xff;
684 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
691 pci_user_read_config_byte(dev
, off
, &val
);
692 data
[off
- init_off
] = val
;
697 pci_config_pm_runtime_put(dev
);
702 static ssize_t
pci_write_config(struct file
*filp
, struct kobject
*kobj
,
703 struct bin_attribute
*bin_attr
, char *buf
,
704 loff_t off
, size_t count
)
706 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
, struct device
,
708 unsigned int size
= count
;
709 loff_t init_off
= off
;
710 u8
*data
= (u8
*) buf
;
712 if (off
> dev
->cfg_size
)
714 if (off
+ count
> dev
->cfg_size
) {
715 size
= dev
->cfg_size
- off
;
719 pci_config_pm_runtime_get(dev
);
721 if ((off
& 1) && size
) {
722 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
727 if ((off
& 3) && size
> 2) {
728 u16 val
= data
[off
- init_off
];
729 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
730 pci_user_write_config_word(dev
, off
, val
);
736 u32 val
= data
[off
- init_off
];
737 val
|= (u32
) data
[off
- init_off
+ 1] << 8;
738 val
|= (u32
) data
[off
- init_off
+ 2] << 16;
739 val
|= (u32
) data
[off
- init_off
+ 3] << 24;
740 pci_user_write_config_dword(dev
, off
, val
);
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 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
759 pci_config_pm_runtime_put(dev
);
764 static ssize_t
read_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
765 struct bin_attribute
*bin_attr
, char *buf
,
766 loff_t off
, size_t count
)
768 struct pci_dev
*dev
=
769 to_pci_dev(container_of(kobj
, struct device
, kobj
));
771 if (off
> bin_attr
->size
)
773 else if (count
> bin_attr
->size
- off
)
774 count
= bin_attr
->size
- off
;
776 return pci_read_vpd(dev
, off
, count
, buf
);
779 static ssize_t
write_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
780 struct bin_attribute
*bin_attr
, char *buf
,
781 loff_t off
, size_t count
)
783 struct pci_dev
*dev
=
784 to_pci_dev(container_of(kobj
, struct device
, kobj
));
786 if (off
> bin_attr
->size
)
788 else if (count
> bin_attr
->size
- off
)
789 count
= bin_attr
->size
- off
;
791 return pci_write_vpd(dev
, off
, count
, buf
);
794 #ifdef HAVE_PCI_LEGACY
796 * pci_read_legacy_io - read byte(s) from legacy I/O port space
797 * @filp: open sysfs file
798 * @kobj: kobject corresponding to file to read from
799 * @bin_attr: struct bin_attribute for this file
800 * @buf: buffer to store results
801 * @off: offset into legacy I/O port space
802 * @count: number of bytes to read
804 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
805 * callback routine (pci_legacy_read).
807 static ssize_t
pci_read_legacy_io(struct file
*filp
, struct kobject
*kobj
,
808 struct bin_attribute
*bin_attr
, char *buf
,
809 loff_t off
, size_t count
)
811 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
814 /* Only support 1, 2 or 4 byte accesses */
815 if (count
!= 1 && count
!= 2 && count
!= 4)
818 return pci_legacy_read(bus
, off
, (u32
*)buf
, count
);
822 * pci_write_legacy_io - write byte(s) to legacy I/O port space
823 * @filp: open sysfs file
824 * @kobj: kobject corresponding to file to read from
825 * @bin_attr: struct bin_attribute for this file
826 * @buf: buffer containing value to be written
827 * @off: offset into legacy I/O port space
828 * @count: number of bytes to write
830 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
831 * callback routine (pci_legacy_write).
833 static ssize_t
pci_write_legacy_io(struct file
*filp
, struct kobject
*kobj
,
834 struct bin_attribute
*bin_attr
, char *buf
,
835 loff_t off
, size_t count
)
837 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
840 /* Only support 1, 2 or 4 byte accesses */
841 if (count
!= 1 && count
!= 2 && count
!= 4)
844 return pci_legacy_write(bus
, off
, *(u32
*)buf
, count
);
848 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
849 * @filp: open sysfs file
850 * @kobj: kobject corresponding to device to be mapped
851 * @attr: struct bin_attribute for this file
852 * @vma: struct vm_area_struct passed to mmap
854 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
855 * legacy memory space (first meg of bus space) into application virtual
858 static int pci_mmap_legacy_mem(struct file
*filp
, struct kobject
*kobj
,
859 struct bin_attribute
*attr
,
860 struct vm_area_struct
*vma
)
862 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
865 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_mem
);
869 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
870 * @filp: open sysfs file
871 * @kobj: kobject corresponding to device to be mapped
872 * @attr: struct bin_attribute for this file
873 * @vma: struct vm_area_struct passed to mmap
875 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
876 * legacy IO space (first meg of bus space) into application virtual
877 * memory space. Returns -ENOSYS if the operation isn't supported
879 static int pci_mmap_legacy_io(struct file
*filp
, struct kobject
*kobj
,
880 struct bin_attribute
*attr
,
881 struct vm_area_struct
*vma
)
883 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
886 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_io
);
890 * pci_adjust_legacy_attr - adjustment of legacy file attributes
891 * @b: bus to create files under
892 * @mmap_type: I/O port or memory
894 * Stub implementation. Can be overridden by arch if necessary.
896 void __weak
pci_adjust_legacy_attr(struct pci_bus
*b
,
897 enum pci_mmap_state mmap_type
)
902 * pci_create_legacy_files - create legacy I/O port and memory files
903 * @b: bus to create files under
905 * Some platforms allow access to legacy I/O port and ISA memory space on
906 * a per-bus basis. This routine creates the files and ties them into
907 * their associated read, write and mmap files from pci-sysfs.c
909 * On error unwind, but don't propagate the error to the caller
910 * as it is ok to set up the PCI bus without these files.
912 void pci_create_legacy_files(struct pci_bus
*b
)
916 b
->legacy_io
= kzalloc(sizeof(struct bin_attribute
) * 2,
921 sysfs_bin_attr_init(b
->legacy_io
);
922 b
->legacy_io
->attr
.name
= "legacy_io";
923 b
->legacy_io
->size
= 0xffff;
924 b
->legacy_io
->attr
.mode
= S_IRUSR
| S_IWUSR
;
925 b
->legacy_io
->read
= pci_read_legacy_io
;
926 b
->legacy_io
->write
= pci_write_legacy_io
;
927 b
->legacy_io
->mmap
= pci_mmap_legacy_io
;
928 pci_adjust_legacy_attr(b
, pci_mmap_io
);
929 error
= device_create_bin_file(&b
->dev
, b
->legacy_io
);
933 /* Allocated above after the legacy_io struct */
934 b
->legacy_mem
= b
->legacy_io
+ 1;
935 sysfs_bin_attr_init(b
->legacy_mem
);
936 b
->legacy_mem
->attr
.name
= "legacy_mem";
937 b
->legacy_mem
->size
= 1024*1024;
938 b
->legacy_mem
->attr
.mode
= S_IRUSR
| S_IWUSR
;
939 b
->legacy_mem
->mmap
= pci_mmap_legacy_mem
;
940 pci_adjust_legacy_attr(b
, pci_mmap_mem
);
941 error
= device_create_bin_file(&b
->dev
, b
->legacy_mem
);
948 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
953 printk(KERN_WARNING
"pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
957 void pci_remove_legacy_files(struct pci_bus
*b
)
960 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
961 device_remove_bin_file(&b
->dev
, b
->legacy_mem
);
962 kfree(b
->legacy_io
); /* both are allocated here */
965 #endif /* HAVE_PCI_LEGACY */
969 int pci_mmap_fits(struct pci_dev
*pdev
, int resno
, struct vm_area_struct
*vma
,
970 enum pci_mmap_api mmap_api
)
972 unsigned long nr
, start
, size
, pci_start
;
974 if (pci_resource_len(pdev
, resno
) == 0)
977 start
= vma
->vm_pgoff
;
978 size
= ((pci_resource_len(pdev
, resno
) - 1) >> PAGE_SHIFT
) + 1;
979 pci_start
= (mmap_api
== PCI_MMAP_PROCFS
) ?
980 pci_resource_start(pdev
, resno
) >> PAGE_SHIFT
: 0;
981 if (start
>= pci_start
&& start
< pci_start
+ size
&&
982 start
+ nr
<= pci_start
+ size
)
988 * pci_mmap_resource - map a PCI resource into user memory space
989 * @kobj: kobject for mapping
990 * @attr: struct bin_attribute for the file being mapped
991 * @vma: struct vm_area_struct passed into the mmap
992 * @write_combine: 1 for write_combine mapping
994 * Use the regular PCI mapping routines to map a PCI resource into userspace.
996 static int pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
997 struct vm_area_struct
*vma
, int write_combine
)
999 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
1000 struct device
, kobj
));
1001 struct resource
*res
= attr
->private;
1002 enum pci_mmap_state mmap_type
;
1003 resource_size_t start
, end
;
1006 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
1007 if (res
== &pdev
->resource
[i
])
1009 if (i
>= PCI_ROM_RESOURCE
)
1012 if (!pci_mmap_fits(pdev
, i
, vma
, PCI_MMAP_SYSFS
)) {
1013 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",
1014 current
->comm
, vma
->vm_end
-vma
->vm_start
, vma
->vm_pgoff
,
1016 (u64
)pci_resource_start(pdev
, i
),
1017 (u64
)pci_resource_len(pdev
, i
));
1021 /* pci_mmap_page_range() expects the same kind of entry as coming
1022 * from /proc/bus/pci/ which is a "user visible" value. If this is
1023 * different from the resource itself, arch will do necessary fixup.
1025 pci_resource_to_user(pdev
, i
, res
, &start
, &end
);
1026 vma
->vm_pgoff
+= start
>> PAGE_SHIFT
;
1027 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
1029 if (res
->flags
& IORESOURCE_MEM
&& iomem_is_exclusive(start
))
1032 return pci_mmap_page_range(pdev
, vma
, mmap_type
, write_combine
);
1035 static int pci_mmap_resource_uc(struct file
*filp
, struct kobject
*kobj
,
1036 struct bin_attribute
*attr
,
1037 struct vm_area_struct
*vma
)
1039 return pci_mmap_resource(kobj
, attr
, vma
, 0);
1042 static int pci_mmap_resource_wc(struct file
*filp
, struct kobject
*kobj
,
1043 struct bin_attribute
*attr
,
1044 struct vm_area_struct
*vma
)
1046 return pci_mmap_resource(kobj
, attr
, vma
, 1);
1049 static ssize_t
pci_resource_io(struct file
*filp
, struct kobject
*kobj
,
1050 struct bin_attribute
*attr
, char *buf
,
1051 loff_t off
, size_t count
, bool write
)
1053 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
1054 struct device
, kobj
));
1055 struct resource
*res
= attr
->private;
1056 unsigned long port
= off
;
1059 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
1060 if (res
== &pdev
->resource
[i
])
1062 if (i
>= PCI_ROM_RESOURCE
)
1065 port
+= pci_resource_start(pdev
, i
);
1067 if (port
> pci_resource_end(pdev
, i
))
1070 if (port
+ count
- 1 > pci_resource_end(pdev
, i
))
1076 outb(*(u8
*)buf
, port
);
1078 *(u8
*)buf
= inb(port
);
1082 outw(*(u16
*)buf
, port
);
1084 *(u16
*)buf
= inw(port
);
1088 outl(*(u32
*)buf
, port
);
1090 *(u32
*)buf
= inl(port
);
1096 static ssize_t
pci_read_resource_io(struct file
*filp
, struct kobject
*kobj
,
1097 struct bin_attribute
*attr
, char *buf
,
1098 loff_t off
, size_t count
)
1100 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, false);
1103 static ssize_t
pci_write_resource_io(struct file
*filp
, struct kobject
*kobj
,
1104 struct bin_attribute
*attr
, char *buf
,
1105 loff_t off
, size_t count
)
1107 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, true);
1111 * pci_remove_resource_files - cleanup resource files
1112 * @pdev: dev to cleanup
1114 * If we created resource files for @pdev, remove them from sysfs and
1115 * free their resources.
1117 static void pci_remove_resource_files(struct pci_dev
*pdev
)
1121 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1122 struct bin_attribute
*res_attr
;
1124 res_attr
= pdev
->res_attr
[i
];
1126 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1130 res_attr
= pdev
->res_attr_wc
[i
];
1132 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1138 static int pci_create_attr(struct pci_dev
*pdev
, int num
, int write_combine
)
1140 /* allocate attribute structure, piggyback attribute name */
1141 int name_len
= write_combine
? 13 : 10;
1142 struct bin_attribute
*res_attr
;
1145 res_attr
= kzalloc(sizeof(*res_attr
) + name_len
, GFP_ATOMIC
);
1147 char *res_attr_name
= (char *)(res_attr
+ 1);
1149 sysfs_bin_attr_init(res_attr
);
1150 if (write_combine
) {
1151 pdev
->res_attr_wc
[num
] = res_attr
;
1152 sprintf(res_attr_name
, "resource%d_wc", num
);
1153 res_attr
->mmap
= pci_mmap_resource_wc
;
1155 pdev
->res_attr
[num
] = res_attr
;
1156 sprintf(res_attr_name
, "resource%d", num
);
1157 res_attr
->mmap
= pci_mmap_resource_uc
;
1159 if (pci_resource_flags(pdev
, num
) & IORESOURCE_IO
) {
1160 res_attr
->read
= pci_read_resource_io
;
1161 res_attr
->write
= pci_write_resource_io
;
1163 res_attr
->attr
.name
= res_attr_name
;
1164 res_attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1165 res_attr
->size
= pci_resource_len(pdev
, num
);
1166 res_attr
->private = &pdev
->resource
[num
];
1167 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
1175 * pci_create_resource_files - create resource files in sysfs for @dev
1176 * @pdev: dev in question
1178 * Walk the resources in @pdev creating files for each resource available.
1180 static int pci_create_resource_files(struct pci_dev
*pdev
)
1185 /* Expose the PCI resources from this device as files */
1186 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1188 /* skip empty resources */
1189 if (!pci_resource_len(pdev
, i
))
1192 retval
= pci_create_attr(pdev
, i
, 0);
1193 /* for prefetchable resources, create a WC mappable file */
1194 if (!retval
&& pdev
->resource
[i
].flags
& IORESOURCE_PREFETCH
)
1195 retval
= pci_create_attr(pdev
, i
, 1);
1198 pci_remove_resource_files(pdev
);
1204 #else /* !HAVE_PCI_MMAP */
1205 int __weak
pci_create_resource_files(struct pci_dev
*dev
) { return 0; }
1206 void __weak
pci_remove_resource_files(struct pci_dev
*dev
) { return; }
1207 #endif /* HAVE_PCI_MMAP */
1210 * pci_write_rom - used to enable access to the PCI ROM display
1212 * @kobj: kernel object handle
1213 * @bin_attr: struct bin_attribute for this file
1216 * @count: number of byte in input
1218 * writing anything except 0 enables it
1220 static ssize_t
pci_write_rom(struct file
*filp
, struct kobject
*kobj
,
1221 struct bin_attribute
*bin_attr
, char *buf
,
1222 loff_t off
, size_t count
)
1224 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1226 if ((off
== 0) && (*buf
== '0') && (count
== 2))
1227 pdev
->rom_attr_enabled
= 0;
1229 pdev
->rom_attr_enabled
= 1;
1235 * pci_read_rom - read a PCI ROM
1237 * @kobj: kernel object handle
1238 * @bin_attr: struct bin_attribute for this file
1239 * @buf: where to put the data we read from the ROM
1241 * @count: number of bytes to read
1243 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1244 * device corresponding to @kobj.
1246 static ssize_t
pci_read_rom(struct file
*filp
, struct kobject
*kobj
,
1247 struct bin_attribute
*bin_attr
, char *buf
,
1248 loff_t off
, size_t count
)
1250 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1254 if (!pdev
->rom_attr_enabled
)
1257 rom
= pci_map_rom(pdev
, &size
); /* size starts out as PCI window size */
1264 if (off
+ count
> size
)
1267 memcpy_fromio(buf
, rom
+ off
, count
);
1269 pci_unmap_rom(pdev
, rom
);
1274 static struct bin_attribute pci_config_attr
= {
1277 .mode
= S_IRUGO
| S_IWUSR
,
1279 .size
= PCI_CFG_SPACE_SIZE
,
1280 .read
= pci_read_config
,
1281 .write
= pci_write_config
,
1284 static struct bin_attribute pcie_config_attr
= {
1287 .mode
= S_IRUGO
| S_IWUSR
,
1289 .size
= PCI_CFG_SPACE_EXP_SIZE
,
1290 .read
= pci_read_config
,
1291 .write
= pci_write_config
,
1294 static ssize_t
reset_store(struct device
*dev
, struct device_attribute
*attr
,
1295 const char *buf
, size_t count
)
1297 struct pci_dev
*pdev
= to_pci_dev(dev
);
1299 ssize_t result
= kstrtoul(buf
, 0, &val
);
1307 result
= pci_reset_function(pdev
);
1314 static struct device_attribute reset_attr
= __ATTR(reset
, 0200, NULL
, reset_store
);
1316 static int pci_create_capabilities_sysfs(struct pci_dev
*dev
)
1319 struct bin_attribute
*attr
;
1321 /* If the device has VPD, try to expose it in sysfs. */
1323 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1327 sysfs_bin_attr_init(attr
);
1328 attr
->size
= dev
->vpd
->len
;
1329 attr
->attr
.name
= "vpd";
1330 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1331 attr
->read
= read_vpd_attr
;
1332 attr
->write
= write_vpd_attr
;
1333 retval
= sysfs_create_bin_file(&dev
->dev
.kobj
, attr
);
1338 dev
->vpd
->attr
= attr
;
1341 /* Active State Power Management */
1342 pcie_aspm_create_sysfs_dev_files(dev
);
1344 if (!pci_probe_reset_function(dev
)) {
1345 retval
= device_create_file(&dev
->dev
, &reset_attr
);
1353 pcie_aspm_remove_sysfs_dev_files(dev
);
1354 if (dev
->vpd
&& dev
->vpd
->attr
) {
1355 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1356 kfree(dev
->vpd
->attr
);
1362 int __must_check
pci_create_sysfs_dev_files(struct pci_dev
*pdev
)
1366 struct bin_attribute
*attr
;
1368 if (!sysfs_initialized
)
1371 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1372 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1374 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1378 retval
= pci_create_resource_files(pdev
);
1380 goto err_config_file
;
1382 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1383 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1384 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1387 /* If the device has a ROM, try to expose it in sysfs. */
1389 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1392 goto err_resource_files
;
1394 sysfs_bin_attr_init(attr
);
1395 attr
->size
= rom_size
;
1396 attr
->attr
.name
= "rom";
1397 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1398 attr
->read
= pci_read_rom
;
1399 attr
->write
= pci_write_rom
;
1400 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, attr
);
1403 goto err_resource_files
;
1405 pdev
->rom_attr
= attr
;
1408 /* add sysfs entries for various capabilities */
1409 retval
= pci_create_capabilities_sysfs(pdev
);
1413 pci_create_firmware_label_files(pdev
);
1419 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1420 kfree(pdev
->rom_attr
);
1421 pdev
->rom_attr
= NULL
;
1424 pci_remove_resource_files(pdev
);
1426 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1427 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1429 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1434 static void pci_remove_capabilities_sysfs(struct pci_dev
*dev
)
1436 if (dev
->vpd
&& dev
->vpd
->attr
) {
1437 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1438 kfree(dev
->vpd
->attr
);
1441 pcie_aspm_remove_sysfs_dev_files(dev
);
1442 if (dev
->reset_fn
) {
1443 device_remove_file(&dev
->dev
, &reset_attr
);
1449 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1450 * @pdev: device whose entries we should free
1452 * Cleanup when @pdev is removed from sysfs.
1454 void pci_remove_sysfs_dev_files(struct pci_dev
*pdev
)
1458 if (!sysfs_initialized
)
1461 pci_remove_capabilities_sysfs(pdev
);
1463 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1464 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1466 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1468 pci_remove_resource_files(pdev
);
1470 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1471 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1472 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1475 if (rom_size
&& pdev
->rom_attr
) {
1476 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1477 kfree(pdev
->rom_attr
);
1480 pci_remove_firmware_label_files(pdev
);
1484 static int __init
pci_sysfs_init(void)
1486 struct pci_dev
*pdev
= NULL
;
1489 sysfs_initialized
= 1;
1490 for_each_pci_dev(pdev
) {
1491 retval
= pci_create_sysfs_dev_files(pdev
);
1500 late_initcall(pci_sysfs_init
);
1502 static struct attribute
*pci_dev_dev_attrs
[] = {
1507 static umode_t
pci_dev_attrs_are_visible(struct kobject
*kobj
,
1508 struct attribute
*a
, int n
)
1510 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1511 struct pci_dev
*pdev
= to_pci_dev(dev
);
1513 if (a
== &vga_attr
.attr
)
1514 if ((pdev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
1520 static struct attribute
*pci_dev_hp_attrs
[] = {
1521 &dev_remove_attr
.attr
,
1522 &dev_rescan_attr
.attr
,
1526 static umode_t
pci_dev_hp_attrs_are_visible(struct kobject
*kobj
,
1527 struct attribute
*a
, int n
)
1529 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1530 struct pci_dev
*pdev
= to_pci_dev(dev
);
1532 if (pdev
->is_virtfn
)
1538 static struct attribute_group pci_dev_hp_attr_group
= {
1539 .attrs
= pci_dev_hp_attrs
,
1540 .is_visible
= pci_dev_hp_attrs_are_visible
,
1543 #ifdef CONFIG_PCI_IOV
1544 static struct attribute
*sriov_dev_attrs
[] = {
1545 &sriov_totalvfs_attr
.attr
,
1546 &sriov_numvfs_attr
.attr
,
1550 static umode_t
sriov_attrs_are_visible(struct kobject
*kobj
,
1551 struct attribute
*a
, int n
)
1553 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1555 if (!dev_is_pf(dev
))
1561 static struct attribute_group sriov_dev_attr_group
= {
1562 .attrs
= sriov_dev_attrs
,
1563 .is_visible
= sriov_attrs_are_visible
,
1565 #endif /* CONFIG_PCI_IOV */
1567 static struct attribute_group pci_dev_attr_group
= {
1568 .attrs
= pci_dev_dev_attrs
,
1569 .is_visible
= pci_dev_attrs_are_visible
,
1572 static const struct attribute_group
*pci_dev_attr_groups
[] = {
1573 &pci_dev_attr_group
,
1574 &pci_dev_hp_attr_group
,
1575 #ifdef CONFIG_PCI_IOV
1576 &sriov_dev_attr_group
,
1581 struct device_type pci_dev_type
= {
1582 .groups
= pci_dev_attr_groups
,