1 // SPDX-License-Identifier: GPL-2.0
3 * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
4 * (C) Copyright 2002-2004 IBM Corp.
5 * (C) Copyright 2003 Matthew Wilcox
6 * (C) Copyright 2003 Hewlett-Packard
7 * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
8 * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
10 * File attributes for PCI devices
12 * Modeled after usb's driverfs.c
16 #include <linux/kernel.h>
17 #include <linux/sched.h>
18 #include <linux/pci.h>
19 #include <linux/stat.h>
20 #include <linux/export.h>
21 #include <linux/topology.h>
24 #include <linux/capability.h>
25 #include <linux/security.h>
26 #include <linux/slab.h>
27 #include <linux/vgaarb.h>
28 #include <linux/pm_runtime.h>
32 static int sysfs_initialized
; /* = 0 */
34 /* show configuration fields */
35 #define pci_config_attr(field, format_string) \
37 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
39 struct pci_dev *pdev; \
41 pdev = to_pci_dev(dev); \
42 return sysfs_emit(buf, format_string, pdev->field); \
44 static DEVICE_ATTR_RO(field)
46 pci_config_attr(vendor
, "0x%04x\n");
47 pci_config_attr(device
, "0x%04x\n");
48 pci_config_attr(subsystem_vendor
, "0x%04x\n");
49 pci_config_attr(subsystem_device
, "0x%04x\n");
50 pci_config_attr(revision
, "0x%02x\n");
51 pci_config_attr(class, "0x%06x\n");
52 pci_config_attr(irq
, "%u\n");
54 static ssize_t
broken_parity_status_show(struct device
*dev
,
55 struct device_attribute
*attr
,
58 struct pci_dev
*pdev
= to_pci_dev(dev
);
59 return sysfs_emit(buf
, "%u\n", pdev
->broken_parity_status
);
62 static ssize_t
broken_parity_status_store(struct device
*dev
,
63 struct device_attribute
*attr
,
64 const char *buf
, size_t count
)
66 struct pci_dev
*pdev
= to_pci_dev(dev
);
69 if (kstrtoul(buf
, 0, &val
) < 0)
72 pdev
->broken_parity_status
= !!val
;
76 static DEVICE_ATTR_RW(broken_parity_status
);
78 static ssize_t
pci_dev_show_local_cpu(struct device
*dev
, bool list
,
79 struct device_attribute
*attr
, char *buf
)
81 const struct cpumask
*mask
;
84 mask
= (dev_to_node(dev
) == -1) ? cpu_online_mask
:
85 cpumask_of_node(dev_to_node(dev
));
87 mask
= cpumask_of_pcibus(to_pci_dev(dev
)->bus
);
89 return cpumap_print_to_pagebuf(list
, buf
, mask
);
92 static ssize_t
local_cpus_show(struct device
*dev
,
93 struct device_attribute
*attr
, char *buf
)
95 return pci_dev_show_local_cpu(dev
, false, attr
, buf
);
97 static DEVICE_ATTR_RO(local_cpus
);
99 static ssize_t
local_cpulist_show(struct device
*dev
,
100 struct device_attribute
*attr
, char *buf
)
102 return pci_dev_show_local_cpu(dev
, true, attr
, buf
);
104 static DEVICE_ATTR_RO(local_cpulist
);
107 * PCI Bus Class Devices
109 static ssize_t
cpuaffinity_show(struct device
*dev
,
110 struct device_attribute
*attr
, char *buf
)
112 const struct cpumask
*cpumask
= cpumask_of_pcibus(to_pci_bus(dev
));
114 return cpumap_print_to_pagebuf(false, buf
, cpumask
);
116 static DEVICE_ATTR_RO(cpuaffinity
);
118 static ssize_t
cpulistaffinity_show(struct device
*dev
,
119 struct device_attribute
*attr
, char *buf
)
121 const struct cpumask
*cpumask
= cpumask_of_pcibus(to_pci_bus(dev
));
123 return cpumap_print_to_pagebuf(true, buf
, cpumask
);
125 static DEVICE_ATTR_RO(cpulistaffinity
);
127 static ssize_t
power_state_show(struct device
*dev
,
128 struct device_attribute
*attr
, char *buf
)
130 struct pci_dev
*pdev
= to_pci_dev(dev
);
132 return sysfs_emit(buf
, "%s\n", pci_power_name(pdev
->current_state
));
134 static DEVICE_ATTR_RO(power_state
);
137 static ssize_t
resource_show(struct device
*dev
, struct device_attribute
*attr
,
140 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
143 resource_size_t start
, end
;
146 if (pci_dev
->subordinate
)
147 max
= DEVICE_COUNT_RESOURCE
;
149 max
= PCI_BRIDGE_RESOURCES
;
151 for (i
= 0; i
< max
; i
++) {
152 struct resource
*res
= &pci_dev
->resource
[i
];
153 pci_resource_to_user(pci_dev
, i
, res
, &start
, &end
);
154 len
+= sysfs_emit_at(buf
, len
, "0x%016llx 0x%016llx 0x%016llx\n",
155 (unsigned long long)start
,
156 (unsigned long long)end
,
157 (unsigned long long)res
->flags
);
161 static DEVICE_ATTR_RO(resource
);
163 static ssize_t
max_link_speed_show(struct device
*dev
,
164 struct device_attribute
*attr
, char *buf
)
166 struct pci_dev
*pdev
= to_pci_dev(dev
);
168 return sysfs_emit(buf
, "%s\n",
169 pci_speed_string(pcie_get_speed_cap(pdev
)));
171 static DEVICE_ATTR_RO(max_link_speed
);
173 static ssize_t
max_link_width_show(struct device
*dev
,
174 struct device_attribute
*attr
, char *buf
)
176 struct pci_dev
*pdev
= to_pci_dev(dev
);
178 return sysfs_emit(buf
, "%u\n", pcie_get_width_cap(pdev
));
180 static DEVICE_ATTR_RO(max_link_width
);
182 static ssize_t
current_link_speed_show(struct device
*dev
,
183 struct device_attribute
*attr
, char *buf
)
185 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
188 enum pci_bus_speed speed
;
190 err
= pcie_capability_read_word(pci_dev
, PCI_EXP_LNKSTA
, &linkstat
);
194 speed
= pcie_link_speed
[linkstat
& PCI_EXP_LNKSTA_CLS
];
196 return sysfs_emit(buf
, "%s\n", pci_speed_string(speed
));
198 static DEVICE_ATTR_RO(current_link_speed
);
200 static ssize_t
current_link_width_show(struct device
*dev
,
201 struct device_attribute
*attr
, char *buf
)
203 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
207 err
= pcie_capability_read_word(pci_dev
, PCI_EXP_LNKSTA
, &linkstat
);
211 return sysfs_emit(buf
, "%u\n",
212 (linkstat
& PCI_EXP_LNKSTA_NLW
) >> PCI_EXP_LNKSTA_NLW_SHIFT
);
214 static DEVICE_ATTR_RO(current_link_width
);
216 static ssize_t
secondary_bus_number_show(struct device
*dev
,
217 struct device_attribute
*attr
,
220 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
224 err
= pci_read_config_byte(pci_dev
, PCI_SECONDARY_BUS
, &sec_bus
);
228 return sysfs_emit(buf
, "%u\n", sec_bus
);
230 static DEVICE_ATTR_RO(secondary_bus_number
);
232 static ssize_t
subordinate_bus_number_show(struct device
*dev
,
233 struct device_attribute
*attr
,
236 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
240 err
= pci_read_config_byte(pci_dev
, PCI_SUBORDINATE_BUS
, &sub_bus
);
244 return sysfs_emit(buf
, "%u\n", sub_bus
);
246 static DEVICE_ATTR_RO(subordinate_bus_number
);
248 static ssize_t
ari_enabled_show(struct device
*dev
,
249 struct device_attribute
*attr
,
252 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
254 return sysfs_emit(buf
, "%u\n", pci_ari_enabled(pci_dev
->bus
));
256 static DEVICE_ATTR_RO(ari_enabled
);
258 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*attr
,
261 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
263 return sysfs_emit(buf
, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X\n",
264 pci_dev
->vendor
, pci_dev
->device
,
265 pci_dev
->subsystem_vendor
, pci_dev
->subsystem_device
,
266 (u8
)(pci_dev
->class >> 16), (u8
)(pci_dev
->class >> 8),
267 (u8
)(pci_dev
->class));
269 static DEVICE_ATTR_RO(modalias
);
271 static ssize_t
enable_store(struct device
*dev
, struct device_attribute
*attr
,
272 const char *buf
, size_t count
)
274 struct pci_dev
*pdev
= to_pci_dev(dev
);
276 ssize_t result
= kstrtoul(buf
, 0, &val
);
281 /* this can crash the machine when done on the "wrong" device */
282 if (!capable(CAP_SYS_ADMIN
))
289 result
= pci_enable_device(pdev
);
290 else if (pci_is_enabled(pdev
))
291 pci_disable_device(pdev
);
296 return result
< 0 ? result
: count
;
299 static ssize_t
enable_show(struct device
*dev
, struct device_attribute
*attr
,
302 struct pci_dev
*pdev
;
304 pdev
= to_pci_dev(dev
);
305 return sysfs_emit(buf
, "%u\n", atomic_read(&pdev
->enable_cnt
));
307 static DEVICE_ATTR_RW(enable
);
310 static ssize_t
numa_node_store(struct device
*dev
,
311 struct device_attribute
*attr
, const char *buf
,
314 struct pci_dev
*pdev
= to_pci_dev(dev
);
317 if (!capable(CAP_SYS_ADMIN
))
320 ret
= kstrtoint(buf
, 0, &node
);
324 if ((node
< 0 && node
!= NUMA_NO_NODE
) || node
>= MAX_NUMNODES
)
327 if (node
!= NUMA_NO_NODE
&& !node_online(node
))
330 add_taint(TAINT_FIRMWARE_WORKAROUND
, LOCKDEP_STILL_OK
);
331 pci_alert(pdev
, FW_BUG
"Overriding NUMA node to %d. Contact your vendor for updates.",
334 dev
->numa_node
= node
;
338 static ssize_t
numa_node_show(struct device
*dev
, struct device_attribute
*attr
,
341 return sysfs_emit(buf
, "%d\n", dev
->numa_node
);
343 static DEVICE_ATTR_RW(numa_node
);
346 static ssize_t
dma_mask_bits_show(struct device
*dev
,
347 struct device_attribute
*attr
, char *buf
)
349 struct pci_dev
*pdev
= to_pci_dev(dev
);
351 return sysfs_emit(buf
, "%d\n", fls64(pdev
->dma_mask
));
353 static DEVICE_ATTR_RO(dma_mask_bits
);
355 static ssize_t
consistent_dma_mask_bits_show(struct device
*dev
,
356 struct device_attribute
*attr
,
359 return sysfs_emit(buf
, "%d\n", fls64(dev
->coherent_dma_mask
));
361 static DEVICE_ATTR_RO(consistent_dma_mask_bits
);
363 static ssize_t
msi_bus_show(struct device
*dev
, struct device_attribute
*attr
,
366 struct pci_dev
*pdev
= to_pci_dev(dev
);
367 struct pci_bus
*subordinate
= pdev
->subordinate
;
369 return sysfs_emit(buf
, "%u\n", subordinate
?
370 !(subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
)
374 static ssize_t
msi_bus_store(struct device
*dev
, struct device_attribute
*attr
,
375 const char *buf
, size_t count
)
377 struct pci_dev
*pdev
= to_pci_dev(dev
);
378 struct pci_bus
*subordinate
= pdev
->subordinate
;
381 if (kstrtoul(buf
, 0, &val
) < 0)
384 if (!capable(CAP_SYS_ADMIN
))
388 * "no_msi" and "bus_flags" only affect what happens when a driver
389 * requests MSI or MSI-X. They don't affect any drivers that have
390 * already requested MSI or MSI-X.
394 pci_info(pdev
, "MSI/MSI-X %s for future drivers\n",
395 val
? "allowed" : "disallowed");
400 subordinate
->bus_flags
&= ~PCI_BUS_FLAGS_NO_MSI
;
402 subordinate
->bus_flags
|= PCI_BUS_FLAGS_NO_MSI
;
404 dev_info(&subordinate
->dev
, "MSI/MSI-X %s for future drivers of devices on this bus\n",
405 val
? "allowed" : "disallowed");
408 static DEVICE_ATTR_RW(msi_bus
);
410 static ssize_t
rescan_store(struct bus_type
*bus
, const char *buf
, size_t count
)
413 struct pci_bus
*b
= NULL
;
415 if (kstrtoul(buf
, 0, &val
) < 0)
419 pci_lock_rescan_remove();
420 while ((b
= pci_find_next_bus(b
)) != NULL
)
422 pci_unlock_rescan_remove();
426 static BUS_ATTR_WO(rescan
);
428 static struct attribute
*pci_bus_attrs
[] = {
429 &bus_attr_rescan
.attr
,
433 static const struct attribute_group pci_bus_group
= {
434 .attrs
= pci_bus_attrs
,
437 const struct attribute_group
*pci_bus_groups
[] = {
442 static ssize_t
dev_rescan_store(struct device
*dev
,
443 struct device_attribute
*attr
, const char *buf
,
447 struct pci_dev
*pdev
= to_pci_dev(dev
);
449 if (kstrtoul(buf
, 0, &val
) < 0)
453 pci_lock_rescan_remove();
454 pci_rescan_bus(pdev
->bus
);
455 pci_unlock_rescan_remove();
459 static struct device_attribute dev_attr_dev_rescan
= __ATTR(rescan
, 0200, NULL
,
462 static ssize_t
remove_store(struct device
*dev
, struct device_attribute
*attr
,
463 const char *buf
, size_t count
)
467 if (kstrtoul(buf
, 0, &val
) < 0)
470 if (val
&& device_remove_file_self(dev
, attr
))
471 pci_stop_and_remove_bus_device_locked(to_pci_dev(dev
));
474 static DEVICE_ATTR_IGNORE_LOCKDEP(remove
, 0220, NULL
,
477 static ssize_t
bus_rescan_store(struct device
*dev
,
478 struct device_attribute
*attr
,
479 const char *buf
, size_t count
)
482 struct pci_bus
*bus
= to_pci_bus(dev
);
484 if (kstrtoul(buf
, 0, &val
) < 0)
488 pci_lock_rescan_remove();
489 if (!pci_is_root_bus(bus
) && list_empty(&bus
->devices
))
490 pci_rescan_bus_bridge_resize(bus
->self
);
493 pci_unlock_rescan_remove();
497 static struct device_attribute dev_attr_bus_rescan
= __ATTR(rescan
, 0200, NULL
,
500 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
501 static ssize_t
d3cold_allowed_store(struct device
*dev
,
502 struct device_attribute
*attr
,
503 const char *buf
, size_t count
)
505 struct pci_dev
*pdev
= to_pci_dev(dev
);
508 if (kstrtoul(buf
, 0, &val
) < 0)
511 pdev
->d3cold_allowed
= !!val
;
512 if (pdev
->d3cold_allowed
)
513 pci_d3cold_enable(pdev
);
515 pci_d3cold_disable(pdev
);
517 pm_runtime_resume(dev
);
522 static ssize_t
d3cold_allowed_show(struct device
*dev
,
523 struct device_attribute
*attr
, char *buf
)
525 struct pci_dev
*pdev
= to_pci_dev(dev
);
526 return sysfs_emit(buf
, "%u\n", pdev
->d3cold_allowed
);
528 static DEVICE_ATTR_RW(d3cold_allowed
);
532 static ssize_t
devspec_show(struct device
*dev
,
533 struct device_attribute
*attr
, char *buf
)
535 struct pci_dev
*pdev
= to_pci_dev(dev
);
536 struct device_node
*np
= pci_device_to_OF_node(pdev
);
540 return sysfs_emit(buf
, "%pOF\n", np
);
542 static DEVICE_ATTR_RO(devspec
);
545 static ssize_t
driver_override_store(struct device
*dev
,
546 struct device_attribute
*attr
,
547 const char *buf
, size_t count
)
549 struct pci_dev
*pdev
= to_pci_dev(dev
);
550 char *driver_override
, *old
, *cp
;
552 /* We need to keep extra room for a newline */
553 if (count
>= (PAGE_SIZE
- 1))
556 driver_override
= kstrndup(buf
, count
, GFP_KERNEL
);
557 if (!driver_override
)
560 cp
= strchr(driver_override
, '\n');
565 old
= pdev
->driver_override
;
566 if (strlen(driver_override
)) {
567 pdev
->driver_override
= driver_override
;
569 kfree(driver_override
);
570 pdev
->driver_override
= NULL
;
579 static ssize_t
driver_override_show(struct device
*dev
,
580 struct device_attribute
*attr
, char *buf
)
582 struct pci_dev
*pdev
= to_pci_dev(dev
);
586 len
= sysfs_emit(buf
, "%s\n", pdev
->driver_override
);
590 static DEVICE_ATTR_RW(driver_override
);
592 static struct attribute
*pci_dev_attrs
[] = {
593 &dev_attr_power_state
.attr
,
594 &dev_attr_resource
.attr
,
595 &dev_attr_vendor
.attr
,
596 &dev_attr_device
.attr
,
597 &dev_attr_subsystem_vendor
.attr
,
598 &dev_attr_subsystem_device
.attr
,
599 &dev_attr_revision
.attr
,
600 &dev_attr_class
.attr
,
602 &dev_attr_local_cpus
.attr
,
603 &dev_attr_local_cpulist
.attr
,
604 &dev_attr_modalias
.attr
,
606 &dev_attr_numa_node
.attr
,
608 &dev_attr_dma_mask_bits
.attr
,
609 &dev_attr_consistent_dma_mask_bits
.attr
,
610 &dev_attr_enable
.attr
,
611 &dev_attr_broken_parity_status
.attr
,
612 &dev_attr_msi_bus
.attr
,
613 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
614 &dev_attr_d3cold_allowed
.attr
,
617 &dev_attr_devspec
.attr
,
619 &dev_attr_driver_override
.attr
,
620 &dev_attr_ari_enabled
.attr
,
624 static struct attribute
*pci_bridge_attrs
[] = {
625 &dev_attr_subordinate_bus_number
.attr
,
626 &dev_attr_secondary_bus_number
.attr
,
630 static struct attribute
*pcie_dev_attrs
[] = {
631 &dev_attr_current_link_speed
.attr
,
632 &dev_attr_current_link_width
.attr
,
633 &dev_attr_max_link_width
.attr
,
634 &dev_attr_max_link_speed
.attr
,
638 static struct attribute
*pcibus_attrs
[] = {
639 &dev_attr_bus_rescan
.attr
,
640 &dev_attr_cpuaffinity
.attr
,
641 &dev_attr_cpulistaffinity
.attr
,
645 static const struct attribute_group pcibus_group
= {
646 .attrs
= pcibus_attrs
,
649 const struct attribute_group
*pcibus_groups
[] = {
654 static ssize_t
boot_vga_show(struct device
*dev
, struct device_attribute
*attr
,
657 struct pci_dev
*pdev
= to_pci_dev(dev
);
658 struct pci_dev
*vga_dev
= vga_default_device();
661 return sysfs_emit(buf
, "%u\n", (pdev
== vga_dev
));
663 return sysfs_emit(buf
, "%u\n",
664 !!(pdev
->resource
[PCI_ROM_RESOURCE
].flags
&
665 IORESOURCE_ROM_SHADOW
));
667 static DEVICE_ATTR_RO(boot_vga
);
669 static ssize_t
pci_read_config(struct file
*filp
, struct kobject
*kobj
,
670 struct bin_attribute
*bin_attr
, char *buf
,
671 loff_t off
, size_t count
)
673 struct pci_dev
*dev
= to_pci_dev(kobj_to_dev(kobj
));
674 unsigned int size
= 64;
675 loff_t init_off
= off
;
676 u8
*data
= (u8
*) buf
;
678 /* Several chips lock up trying to read undefined config space */
679 if (file_ns_capable(filp
, &init_user_ns
, CAP_SYS_ADMIN
))
680 size
= dev
->cfg_size
;
681 else if (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
)
686 if (off
+ count
> size
) {
693 pci_config_pm_runtime_get(dev
);
695 if ((off
& 1) && size
) {
697 pci_user_read_config_byte(dev
, off
, &val
);
698 data
[off
- init_off
] = val
;
703 if ((off
& 3) && size
> 2) {
705 pci_user_read_config_word(dev
, off
, &val
);
706 data
[off
- init_off
] = val
& 0xff;
707 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
714 pci_user_read_config_dword(dev
, off
, &val
);
715 data
[off
- init_off
] = val
& 0xff;
716 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
717 data
[off
- init_off
+ 2] = (val
>> 16) & 0xff;
718 data
[off
- init_off
+ 3] = (val
>> 24) & 0xff;
726 pci_user_read_config_word(dev
, off
, &val
);
727 data
[off
- init_off
] = val
& 0xff;
728 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
735 pci_user_read_config_byte(dev
, off
, &val
);
736 data
[off
- init_off
] = val
;
741 pci_config_pm_runtime_put(dev
);
746 static ssize_t
pci_write_config(struct file
*filp
, struct kobject
*kobj
,
747 struct bin_attribute
*bin_attr
, char *buf
,
748 loff_t off
, size_t count
)
750 struct pci_dev
*dev
= to_pci_dev(kobj_to_dev(kobj
));
751 unsigned int size
= count
;
752 loff_t init_off
= off
;
753 u8
*data
= (u8
*) buf
;
756 ret
= security_locked_down(LOCKDOWN_PCI_ACCESS
);
760 if (off
> dev
->cfg_size
)
762 if (off
+ count
> dev
->cfg_size
) {
763 size
= dev
->cfg_size
- off
;
767 pci_config_pm_runtime_get(dev
);
769 if ((off
& 1) && size
) {
770 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
775 if ((off
& 3) && size
> 2) {
776 u16 val
= data
[off
- init_off
];
777 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
778 pci_user_write_config_word(dev
, off
, val
);
784 u32 val
= data
[off
- init_off
];
785 val
|= (u32
) data
[off
- init_off
+ 1] << 8;
786 val
|= (u32
) data
[off
- init_off
+ 2] << 16;
787 val
|= (u32
) data
[off
- init_off
+ 3] << 24;
788 pci_user_write_config_dword(dev
, off
, val
);
794 u16 val
= data
[off
- init_off
];
795 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
796 pci_user_write_config_word(dev
, off
, val
);
802 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
807 pci_config_pm_runtime_put(dev
);
811 static BIN_ATTR(config
, 0644, pci_read_config
, pci_write_config
, 0);
813 static struct bin_attribute
*pci_dev_config_attrs
[] = {
818 static umode_t
pci_dev_config_attr_is_visible(struct kobject
*kobj
,
819 struct bin_attribute
*a
, int n
)
821 struct pci_dev
*pdev
= to_pci_dev(kobj_to_dev(kobj
));
823 a
->size
= PCI_CFG_SPACE_SIZE
;
824 if (pdev
->cfg_size
> PCI_CFG_SPACE_SIZE
)
825 a
->size
= PCI_CFG_SPACE_EXP_SIZE
;
830 static const struct attribute_group pci_dev_config_attr_group
= {
831 .bin_attrs
= pci_dev_config_attrs
,
832 .is_bin_visible
= pci_dev_config_attr_is_visible
,
835 #ifdef HAVE_PCI_LEGACY
837 * pci_read_legacy_io - read byte(s) from legacy I/O port space
838 * @filp: open sysfs file
839 * @kobj: kobject corresponding to file to read from
840 * @bin_attr: struct bin_attribute for this file
841 * @buf: buffer to store results
842 * @off: offset into legacy I/O port space
843 * @count: number of bytes to read
845 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
846 * callback routine (pci_legacy_read).
848 static ssize_t
pci_read_legacy_io(struct file
*filp
, struct kobject
*kobj
,
849 struct bin_attribute
*bin_attr
, char *buf
,
850 loff_t off
, size_t count
)
852 struct pci_bus
*bus
= to_pci_bus(kobj_to_dev(kobj
));
854 /* Only support 1, 2 or 4 byte accesses */
855 if (count
!= 1 && count
!= 2 && count
!= 4)
858 return pci_legacy_read(bus
, off
, (u32
*)buf
, count
);
862 * pci_write_legacy_io - write byte(s) to legacy I/O port space
863 * @filp: open sysfs file
864 * @kobj: kobject corresponding to file to read from
865 * @bin_attr: struct bin_attribute for this file
866 * @buf: buffer containing value to be written
867 * @off: offset into legacy I/O port space
868 * @count: number of bytes to write
870 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
871 * callback routine (pci_legacy_write).
873 static ssize_t
pci_write_legacy_io(struct file
*filp
, struct kobject
*kobj
,
874 struct bin_attribute
*bin_attr
, char *buf
,
875 loff_t off
, size_t count
)
877 struct pci_bus
*bus
= to_pci_bus(kobj_to_dev(kobj
));
879 /* Only support 1, 2 or 4 byte accesses */
880 if (count
!= 1 && count
!= 2 && count
!= 4)
883 return pci_legacy_write(bus
, off
, *(u32
*)buf
, count
);
887 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
888 * @filp: open sysfs file
889 * @kobj: kobject corresponding to device to be mapped
890 * @attr: struct bin_attribute for this file
891 * @vma: struct vm_area_struct passed to mmap
893 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
894 * legacy memory space (first meg of bus space) into application virtual
897 static int pci_mmap_legacy_mem(struct file
*filp
, struct kobject
*kobj
,
898 struct bin_attribute
*attr
,
899 struct vm_area_struct
*vma
)
901 struct pci_bus
*bus
= to_pci_bus(kobj_to_dev(kobj
));
903 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_mem
);
907 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
908 * @filp: open sysfs file
909 * @kobj: kobject corresponding to device to be mapped
910 * @attr: struct bin_attribute for this file
911 * @vma: struct vm_area_struct passed to mmap
913 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
914 * legacy IO space (first meg of bus space) into application virtual
915 * memory space. Returns -ENOSYS if the operation isn't supported
917 static int pci_mmap_legacy_io(struct file
*filp
, struct kobject
*kobj
,
918 struct bin_attribute
*attr
,
919 struct vm_area_struct
*vma
)
921 struct pci_bus
*bus
= to_pci_bus(kobj_to_dev(kobj
));
923 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_io
);
927 * pci_adjust_legacy_attr - adjustment of legacy file attributes
928 * @b: bus to create files under
929 * @mmap_type: I/O port or memory
931 * Stub implementation. Can be overridden by arch if necessary.
933 void __weak
pci_adjust_legacy_attr(struct pci_bus
*b
,
934 enum pci_mmap_state mmap_type
)
939 * pci_create_legacy_files - create legacy I/O port and memory files
940 * @b: bus to create files under
942 * Some platforms allow access to legacy I/O port and ISA memory space on
943 * a per-bus basis. This routine creates the files and ties them into
944 * their associated read, write and mmap files from pci-sysfs.c
946 * On error unwind, but don't propagate the error to the caller
947 * as it is ok to set up the PCI bus without these files.
949 void pci_create_legacy_files(struct pci_bus
*b
)
953 if (!sysfs_initialized
)
956 b
->legacy_io
= kcalloc(2, sizeof(struct bin_attribute
),
961 sysfs_bin_attr_init(b
->legacy_io
);
962 b
->legacy_io
->attr
.name
= "legacy_io";
963 b
->legacy_io
->size
= 0xffff;
964 b
->legacy_io
->attr
.mode
= 0600;
965 b
->legacy_io
->read
= pci_read_legacy_io
;
966 b
->legacy_io
->write
= pci_write_legacy_io
;
967 b
->legacy_io
->mmap
= pci_mmap_legacy_io
;
968 b
->legacy_io
->f_mapping
= iomem_get_mapping
;
969 pci_adjust_legacy_attr(b
, pci_mmap_io
);
970 error
= device_create_bin_file(&b
->dev
, b
->legacy_io
);
974 /* Allocated above after the legacy_io struct */
975 b
->legacy_mem
= b
->legacy_io
+ 1;
976 sysfs_bin_attr_init(b
->legacy_mem
);
977 b
->legacy_mem
->attr
.name
= "legacy_mem";
978 b
->legacy_mem
->size
= 1024*1024;
979 b
->legacy_mem
->attr
.mode
= 0600;
980 b
->legacy_mem
->mmap
= pci_mmap_legacy_mem
;
981 b
->legacy_mem
->f_mapping
= iomem_get_mapping
;
982 pci_adjust_legacy_attr(b
, pci_mmap_mem
);
983 error
= device_create_bin_file(&b
->dev
, b
->legacy_mem
);
990 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
995 dev_warn(&b
->dev
, "could not create legacy I/O port and ISA memory resources in sysfs\n");
998 void pci_remove_legacy_files(struct pci_bus
*b
)
1001 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
1002 device_remove_bin_file(&b
->dev
, b
->legacy_mem
);
1003 kfree(b
->legacy_io
); /* both are allocated here */
1006 #endif /* HAVE_PCI_LEGACY */
1008 #if defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)
1010 int pci_mmap_fits(struct pci_dev
*pdev
, int resno
, struct vm_area_struct
*vma
,
1011 enum pci_mmap_api mmap_api
)
1013 unsigned long nr
, start
, size
;
1014 resource_size_t pci_start
= 0, pci_end
;
1016 if (pci_resource_len(pdev
, resno
) == 0)
1018 nr
= vma_pages(vma
);
1019 start
= vma
->vm_pgoff
;
1020 size
= ((pci_resource_len(pdev
, resno
) - 1) >> PAGE_SHIFT
) + 1;
1021 if (mmap_api
== PCI_MMAP_PROCFS
) {
1022 pci_resource_to_user(pdev
, resno
, &pdev
->resource
[resno
],
1023 &pci_start
, &pci_end
);
1024 pci_start
>>= PAGE_SHIFT
;
1026 if (start
>= pci_start
&& start
< pci_start
+ size
&&
1027 start
+ nr
<= pci_start
+ size
)
1033 * pci_mmap_resource - map a PCI resource into user memory space
1034 * @kobj: kobject for mapping
1035 * @attr: struct bin_attribute for the file being mapped
1036 * @vma: struct vm_area_struct passed into the mmap
1037 * @write_combine: 1 for write_combine mapping
1039 * Use the regular PCI mapping routines to map a PCI resource into userspace.
1041 static int pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
1042 struct vm_area_struct
*vma
, int write_combine
)
1044 struct pci_dev
*pdev
= to_pci_dev(kobj_to_dev(kobj
));
1045 int bar
= (unsigned long)attr
->private;
1046 enum pci_mmap_state mmap_type
;
1047 struct resource
*res
= &pdev
->resource
[bar
];
1050 ret
= security_locked_down(LOCKDOWN_PCI_ACCESS
);
1054 if (res
->flags
& IORESOURCE_MEM
&& iomem_is_exclusive(res
->start
))
1057 if (!pci_mmap_fits(pdev
, bar
, vma
, PCI_MMAP_SYSFS
))
1060 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
1062 return pci_mmap_resource_range(pdev
, bar
, vma
, mmap_type
, write_combine
);
1065 static int pci_mmap_resource_uc(struct file
*filp
, struct kobject
*kobj
,
1066 struct bin_attribute
*attr
,
1067 struct vm_area_struct
*vma
)
1069 return pci_mmap_resource(kobj
, attr
, vma
, 0);
1072 static int pci_mmap_resource_wc(struct file
*filp
, struct kobject
*kobj
,
1073 struct bin_attribute
*attr
,
1074 struct vm_area_struct
*vma
)
1076 return pci_mmap_resource(kobj
, attr
, vma
, 1);
1079 static ssize_t
pci_resource_io(struct file
*filp
, struct kobject
*kobj
,
1080 struct bin_attribute
*attr
, char *buf
,
1081 loff_t off
, size_t count
, bool write
)
1083 struct pci_dev
*pdev
= to_pci_dev(kobj_to_dev(kobj
));
1084 int bar
= (unsigned long)attr
->private;
1085 unsigned long port
= off
;
1087 port
+= pci_resource_start(pdev
, bar
);
1089 if (port
> pci_resource_end(pdev
, bar
))
1092 if (port
+ count
- 1 > pci_resource_end(pdev
, bar
))
1098 outb(*(u8
*)buf
, port
);
1100 *(u8
*)buf
= inb(port
);
1104 outw(*(u16
*)buf
, port
);
1106 *(u16
*)buf
= inw(port
);
1110 outl(*(u32
*)buf
, port
);
1112 *(u32
*)buf
= inl(port
);
1118 static ssize_t
pci_read_resource_io(struct file
*filp
, struct kobject
*kobj
,
1119 struct bin_attribute
*attr
, char *buf
,
1120 loff_t off
, size_t count
)
1122 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, false);
1125 static ssize_t
pci_write_resource_io(struct file
*filp
, struct kobject
*kobj
,
1126 struct bin_attribute
*attr
, char *buf
,
1127 loff_t off
, size_t count
)
1131 ret
= security_locked_down(LOCKDOWN_PCI_ACCESS
);
1135 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, true);
1139 * pci_remove_resource_files - cleanup resource files
1140 * @pdev: dev to cleanup
1142 * If we created resource files for @pdev, remove them from sysfs and
1143 * free their resources.
1145 static void pci_remove_resource_files(struct pci_dev
*pdev
)
1149 for (i
= 0; i
< PCI_STD_NUM_BARS
; i
++) {
1150 struct bin_attribute
*res_attr
;
1152 res_attr
= pdev
->res_attr
[i
];
1154 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1158 res_attr
= pdev
->res_attr_wc
[i
];
1160 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1166 static int pci_create_attr(struct pci_dev
*pdev
, int num
, int write_combine
)
1168 /* allocate attribute structure, piggyback attribute name */
1169 int name_len
= write_combine
? 13 : 10;
1170 struct bin_attribute
*res_attr
;
1171 char *res_attr_name
;
1174 res_attr
= kzalloc(sizeof(*res_attr
) + name_len
, GFP_ATOMIC
);
1178 res_attr_name
= (char *)(res_attr
+ 1);
1180 sysfs_bin_attr_init(res_attr
);
1181 if (write_combine
) {
1182 pdev
->res_attr_wc
[num
] = res_attr
;
1183 sprintf(res_attr_name
, "resource%d_wc", num
);
1184 res_attr
->mmap
= pci_mmap_resource_wc
;
1186 pdev
->res_attr
[num
] = res_attr
;
1187 sprintf(res_attr_name
, "resource%d", num
);
1188 if (pci_resource_flags(pdev
, num
) & IORESOURCE_IO
) {
1189 res_attr
->read
= pci_read_resource_io
;
1190 res_attr
->write
= pci_write_resource_io
;
1191 if (arch_can_pci_mmap_io())
1192 res_attr
->mmap
= pci_mmap_resource_uc
;
1194 res_attr
->mmap
= pci_mmap_resource_uc
;
1198 res_attr
->f_mapping
= iomem_get_mapping
;
1199 res_attr
->attr
.name
= res_attr_name
;
1200 res_attr
->attr
.mode
= 0600;
1201 res_attr
->size
= pci_resource_len(pdev
, num
);
1202 res_attr
->private = (void *)(unsigned long)num
;
1203 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
1211 * pci_create_resource_files - create resource files in sysfs for @dev
1212 * @pdev: dev in question
1214 * Walk the resources in @pdev creating files for each resource available.
1216 static int pci_create_resource_files(struct pci_dev
*pdev
)
1221 /* Expose the PCI resources from this device as files */
1222 for (i
= 0; i
< PCI_STD_NUM_BARS
; i
++) {
1224 /* skip empty resources */
1225 if (!pci_resource_len(pdev
, i
))
1228 retval
= pci_create_attr(pdev
, i
, 0);
1229 /* for prefetchable resources, create a WC mappable file */
1230 if (!retval
&& arch_can_pci_mmap_wc() &&
1231 pdev
->resource
[i
].flags
& IORESOURCE_PREFETCH
)
1232 retval
= pci_create_attr(pdev
, i
, 1);
1234 pci_remove_resource_files(pdev
);
1240 #else /* !(defined(HAVE_PCI_MMAP) || defined(ARCH_GENERIC_PCI_MMAP_RESOURCE)) */
1241 int __weak
pci_create_resource_files(struct pci_dev
*dev
) { return 0; }
1242 void __weak
pci_remove_resource_files(struct pci_dev
*dev
) { return; }
1246 * pci_write_rom - used to enable access to the PCI ROM display
1248 * @kobj: kernel object handle
1249 * @bin_attr: struct bin_attribute for this file
1252 * @count: number of byte in input
1254 * writing anything except 0 enables it
1256 static ssize_t
pci_write_rom(struct file
*filp
, struct kobject
*kobj
,
1257 struct bin_attribute
*bin_attr
, char *buf
,
1258 loff_t off
, size_t count
)
1260 struct pci_dev
*pdev
= to_pci_dev(kobj_to_dev(kobj
));
1262 if ((off
== 0) && (*buf
== '0') && (count
== 2))
1263 pdev
->rom_attr_enabled
= 0;
1265 pdev
->rom_attr_enabled
= 1;
1271 * pci_read_rom - read a PCI ROM
1273 * @kobj: kernel object handle
1274 * @bin_attr: struct bin_attribute for this file
1275 * @buf: where to put the data we read from the ROM
1277 * @count: number of bytes to read
1279 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1280 * device corresponding to @kobj.
1282 static ssize_t
pci_read_rom(struct file
*filp
, struct kobject
*kobj
,
1283 struct bin_attribute
*bin_attr
, char *buf
,
1284 loff_t off
, size_t count
)
1286 struct pci_dev
*pdev
= to_pci_dev(kobj_to_dev(kobj
));
1290 if (!pdev
->rom_attr_enabled
)
1293 rom
= pci_map_rom(pdev
, &size
); /* size starts out as PCI window size */
1300 if (off
+ count
> size
)
1303 memcpy_fromio(buf
, rom
+ off
, count
);
1305 pci_unmap_rom(pdev
, rom
);
1309 static BIN_ATTR(rom
, 0600, pci_read_rom
, pci_write_rom
, 0);
1311 static struct bin_attribute
*pci_dev_rom_attrs
[] = {
1316 static umode_t
pci_dev_rom_attr_is_visible(struct kobject
*kobj
,
1317 struct bin_attribute
*a
, int n
)
1319 struct pci_dev
*pdev
= to_pci_dev(kobj_to_dev(kobj
));
1322 /* If the device has a ROM, try to expose it in sysfs. */
1323 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1329 return a
->attr
.mode
;
1332 static const struct attribute_group pci_dev_rom_attr_group
= {
1333 .bin_attrs
= pci_dev_rom_attrs
,
1334 .is_bin_visible
= pci_dev_rom_attr_is_visible
,
1337 static ssize_t
reset_store(struct device
*dev
, struct device_attribute
*attr
,
1338 const char *buf
, size_t count
)
1340 struct pci_dev
*pdev
= to_pci_dev(dev
);
1342 ssize_t result
= kstrtoul(buf
, 0, &val
);
1350 pm_runtime_get_sync(dev
);
1351 result
= pci_reset_function(pdev
);
1352 pm_runtime_put(dev
);
1358 static DEVICE_ATTR_WO(reset
);
1360 static struct attribute
*pci_dev_reset_attrs
[] = {
1361 &dev_attr_reset
.attr
,
1365 static umode_t
pci_dev_reset_attr_is_visible(struct kobject
*kobj
,
1366 struct attribute
*a
, int n
)
1368 struct pci_dev
*pdev
= to_pci_dev(kobj_to_dev(kobj
));
1370 if (!pci_reset_supported(pdev
))
1376 static const struct attribute_group pci_dev_reset_attr_group
= {
1377 .attrs
= pci_dev_reset_attrs
,
1378 .is_visible
= pci_dev_reset_attr_is_visible
,
1381 int __must_check
pci_create_sysfs_dev_files(struct pci_dev
*pdev
)
1383 if (!sysfs_initialized
)
1386 return pci_create_resource_files(pdev
);
1390 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1391 * @pdev: device whose entries we should free
1393 * Cleanup when @pdev is removed from sysfs.
1395 void pci_remove_sysfs_dev_files(struct pci_dev
*pdev
)
1397 if (!sysfs_initialized
)
1400 pci_remove_resource_files(pdev
);
1403 static int __init
pci_sysfs_init(void)
1405 struct pci_dev
*pdev
= NULL
;
1406 struct pci_bus
*pbus
= NULL
;
1409 sysfs_initialized
= 1;
1410 for_each_pci_dev(pdev
) {
1411 retval
= pci_create_sysfs_dev_files(pdev
);
1418 while ((pbus
= pci_find_next_bus(pbus
)))
1419 pci_create_legacy_files(pbus
);
1423 late_initcall(pci_sysfs_init
);
1425 static struct attribute
*pci_dev_dev_attrs
[] = {
1426 &dev_attr_boot_vga
.attr
,
1430 static umode_t
pci_dev_attrs_are_visible(struct kobject
*kobj
,
1431 struct attribute
*a
, int n
)
1433 struct device
*dev
= kobj_to_dev(kobj
);
1434 struct pci_dev
*pdev
= to_pci_dev(dev
);
1436 if (a
== &dev_attr_boot_vga
.attr
)
1437 if ((pdev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
1443 static struct attribute
*pci_dev_hp_attrs
[] = {
1444 &dev_attr_remove
.attr
,
1445 &dev_attr_dev_rescan
.attr
,
1449 static umode_t
pci_dev_hp_attrs_are_visible(struct kobject
*kobj
,
1450 struct attribute
*a
, int n
)
1452 struct device
*dev
= kobj_to_dev(kobj
);
1453 struct pci_dev
*pdev
= to_pci_dev(dev
);
1455 if (pdev
->is_virtfn
)
1461 static umode_t
pci_bridge_attrs_are_visible(struct kobject
*kobj
,
1462 struct attribute
*a
, int n
)
1464 struct device
*dev
= kobj_to_dev(kobj
);
1465 struct pci_dev
*pdev
= to_pci_dev(dev
);
1467 if (pci_is_bridge(pdev
))
1473 static umode_t
pcie_dev_attrs_are_visible(struct kobject
*kobj
,
1474 struct attribute
*a
, int n
)
1476 struct device
*dev
= kobj_to_dev(kobj
);
1477 struct pci_dev
*pdev
= to_pci_dev(dev
);
1479 if (pci_is_pcie(pdev
))
1485 static const struct attribute_group pci_dev_group
= {
1486 .attrs
= pci_dev_attrs
,
1489 const struct attribute_group
*pci_dev_groups
[] = {
1491 &pci_dev_config_attr_group
,
1492 &pci_dev_rom_attr_group
,
1493 &pci_dev_reset_attr_group
,
1494 &pci_dev_reset_method_attr_group
,
1495 &pci_dev_vpd_attr_group
,
1497 &pci_dev_smbios_attr_group
,
1500 &pci_dev_acpi_attr_group
,
1505 static const struct attribute_group pci_dev_hp_attr_group
= {
1506 .attrs
= pci_dev_hp_attrs
,
1507 .is_visible
= pci_dev_hp_attrs_are_visible
,
1510 static const struct attribute_group pci_dev_attr_group
= {
1511 .attrs
= pci_dev_dev_attrs
,
1512 .is_visible
= pci_dev_attrs_are_visible
,
1515 static const struct attribute_group pci_bridge_attr_group
= {
1516 .attrs
= pci_bridge_attrs
,
1517 .is_visible
= pci_bridge_attrs_are_visible
,
1520 static const struct attribute_group pcie_dev_attr_group
= {
1521 .attrs
= pcie_dev_attrs
,
1522 .is_visible
= pcie_dev_attrs_are_visible
,
1525 static const struct attribute_group
*pci_dev_attr_groups
[] = {
1526 &pci_dev_attr_group
,
1527 &pci_dev_hp_attr_group
,
1528 #ifdef CONFIG_PCI_IOV
1529 &sriov_pf_dev_attr_group
,
1530 &sriov_vf_dev_attr_group
,
1532 &pci_bridge_attr_group
,
1533 &pcie_dev_attr_group
,
1534 #ifdef CONFIG_PCIEAER
1535 &aer_stats_attr_group
,
1537 #ifdef CONFIG_PCIEASPM
1538 &aspm_ctrl_attr_group
,
1543 const struct device_type pci_dev_type
= {
1544 .groups
= pci_dev_attr_groups
,