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 /* We need to keep extra room for a newline */
525 if (count
>= (PAGE_SIZE
- 1))
528 driver_override
= kstrndup(buf
, count
, GFP_KERNEL
);
529 if (!driver_override
)
532 cp
= strchr(driver_override
, '\n');
536 if (strlen(driver_override
)) {
537 pdev
->driver_override
= driver_override
;
539 kfree(driver_override
);
540 pdev
->driver_override
= NULL
;
548 static ssize_t
driver_override_show(struct device
*dev
,
549 struct device_attribute
*attr
, char *buf
)
551 struct pci_dev
*pdev
= to_pci_dev(dev
);
553 return snprintf(buf
, PAGE_SIZE
, "%s\n", pdev
->driver_override
);
555 static DEVICE_ATTR_RW(driver_override
);
557 static struct attribute
*pci_dev_attrs
[] = {
558 &dev_attr_resource
.attr
,
559 &dev_attr_vendor
.attr
,
560 &dev_attr_device
.attr
,
561 &dev_attr_subsystem_vendor
.attr
,
562 &dev_attr_subsystem_device
.attr
,
563 &dev_attr_class
.attr
,
565 &dev_attr_local_cpus
.attr
,
566 &dev_attr_local_cpulist
.attr
,
567 &dev_attr_modalias
.attr
,
569 &dev_attr_numa_node
.attr
,
571 &dev_attr_dma_mask_bits
.attr
,
572 &dev_attr_consistent_dma_mask_bits
.attr
,
573 &dev_attr_enable
.attr
,
574 &dev_attr_broken_parity_status
.attr
,
575 &dev_attr_msi_bus
.attr
,
576 #if defined(CONFIG_PM) && defined(CONFIG_ACPI)
577 &dev_attr_d3cold_allowed
.attr
,
580 &dev_attr_devspec
.attr
,
582 &dev_attr_driver_override
.attr
,
586 static const struct attribute_group pci_dev_group
= {
587 .attrs
= pci_dev_attrs
,
590 const struct attribute_group
*pci_dev_groups
[] = {
595 static struct attribute
*pcibus_attrs
[] = {
596 &dev_attr_rescan
.attr
,
597 &dev_attr_cpuaffinity
.attr
,
598 &dev_attr_cpulistaffinity
.attr
,
602 static const struct attribute_group pcibus_group
= {
603 .attrs
= pcibus_attrs
,
606 const struct attribute_group
*pcibus_groups
[] = {
611 static ssize_t
boot_vga_show(struct device
*dev
, struct device_attribute
*attr
,
614 struct pci_dev
*pdev
= to_pci_dev(dev
);
615 struct pci_dev
*vga_dev
= vga_default_device();
618 return sprintf(buf
, "%u\n", (pdev
== vga_dev
));
620 return sprintf(buf
, "%u\n",
621 !!(pdev
->resource
[PCI_ROM_RESOURCE
].flags
&
622 IORESOURCE_ROM_SHADOW
));
624 static struct device_attribute vga_attr
= __ATTR_RO(boot_vga
);
626 static ssize_t
pci_read_config(struct file
*filp
, struct kobject
*kobj
,
627 struct bin_attribute
*bin_attr
, char *buf
,
628 loff_t off
, size_t count
)
630 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
, struct device
,
632 unsigned int size
= 64;
633 loff_t init_off
= off
;
634 u8
*data
= (u8
*) buf
;
636 /* Several chips lock up trying to read undefined config space */
637 if (security_capable(filp
->f_cred
, &init_user_ns
, CAP_SYS_ADMIN
) == 0)
638 size
= dev
->cfg_size
;
639 else if (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
)
644 if (off
+ count
> size
) {
651 pci_config_pm_runtime_get(dev
);
653 if ((off
& 1) && size
) {
655 pci_user_read_config_byte(dev
, off
, &val
);
656 data
[off
- init_off
] = val
;
661 if ((off
& 3) && size
> 2) {
663 pci_user_read_config_word(dev
, off
, &val
);
664 data
[off
- init_off
] = val
& 0xff;
665 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
672 pci_user_read_config_dword(dev
, off
, &val
);
673 data
[off
- init_off
] = val
& 0xff;
674 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
675 data
[off
- init_off
+ 2] = (val
>> 16) & 0xff;
676 data
[off
- init_off
+ 3] = (val
>> 24) & 0xff;
683 pci_user_read_config_word(dev
, off
, &val
);
684 data
[off
- init_off
] = val
& 0xff;
685 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
692 pci_user_read_config_byte(dev
, off
, &val
);
693 data
[off
- init_off
] = val
;
698 pci_config_pm_runtime_put(dev
);
703 static ssize_t
pci_write_config(struct file
*filp
, struct kobject
*kobj
,
704 struct bin_attribute
*bin_attr
, char *buf
,
705 loff_t off
, size_t count
)
707 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
, struct device
,
709 unsigned int size
= count
;
710 loff_t init_off
= off
;
711 u8
*data
= (u8
*) buf
;
713 if (off
> dev
->cfg_size
)
715 if (off
+ count
> dev
->cfg_size
) {
716 size
= dev
->cfg_size
- off
;
720 pci_config_pm_runtime_get(dev
);
722 if ((off
& 1) && size
) {
723 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
728 if ((off
& 3) && size
> 2) {
729 u16 val
= data
[off
- init_off
];
730 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
731 pci_user_write_config_word(dev
, off
, val
);
737 u32 val
= data
[off
- init_off
];
738 val
|= (u32
) data
[off
- init_off
+ 1] << 8;
739 val
|= (u32
) data
[off
- init_off
+ 2] << 16;
740 val
|= (u32
) data
[off
- init_off
+ 3] << 24;
741 pci_user_write_config_dword(dev
, off
, val
);
747 u16 val
= data
[off
- init_off
];
748 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
749 pci_user_write_config_word(dev
, off
, val
);
755 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
760 pci_config_pm_runtime_put(dev
);
765 static ssize_t
read_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
766 struct bin_attribute
*bin_attr
, char *buf
,
767 loff_t off
, size_t count
)
769 struct pci_dev
*dev
=
770 to_pci_dev(container_of(kobj
, struct device
, kobj
));
772 if (off
> bin_attr
->size
)
774 else if (count
> bin_attr
->size
- off
)
775 count
= bin_attr
->size
- off
;
777 return pci_read_vpd(dev
, off
, count
, buf
);
780 static ssize_t
write_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
781 struct bin_attribute
*bin_attr
, char *buf
,
782 loff_t off
, size_t count
)
784 struct pci_dev
*dev
=
785 to_pci_dev(container_of(kobj
, struct device
, kobj
));
787 if (off
> bin_attr
->size
)
789 else if (count
> bin_attr
->size
- off
)
790 count
= bin_attr
->size
- off
;
792 return pci_write_vpd(dev
, off
, count
, buf
);
795 #ifdef HAVE_PCI_LEGACY
797 * pci_read_legacy_io - read byte(s) from 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 to store results
802 * @off: offset into legacy I/O port space
803 * @count: number of bytes to read
805 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
806 * callback routine (pci_legacy_read).
808 static ssize_t
pci_read_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_read(bus
, off
, (u32
*)buf
, count
);
823 * pci_write_legacy_io - write byte(s) to legacy I/O port space
824 * @filp: open sysfs file
825 * @kobj: kobject corresponding to file to read from
826 * @bin_attr: struct bin_attribute for this file
827 * @buf: buffer containing value to be written
828 * @off: offset into legacy I/O port space
829 * @count: number of bytes to write
831 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
832 * callback routine (pci_legacy_write).
834 static ssize_t
pci_write_legacy_io(struct file
*filp
, struct kobject
*kobj
,
835 struct bin_attribute
*bin_attr
, char *buf
,
836 loff_t off
, size_t count
)
838 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
841 /* Only support 1, 2 or 4 byte accesses */
842 if (count
!= 1 && count
!= 2 && count
!= 4)
845 return pci_legacy_write(bus
, off
, *(u32
*)buf
, count
);
849 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
850 * @filp: open sysfs file
851 * @kobj: kobject corresponding to device to be mapped
852 * @attr: struct bin_attribute for this file
853 * @vma: struct vm_area_struct passed to mmap
855 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
856 * legacy memory space (first meg of bus space) into application virtual
859 static int pci_mmap_legacy_mem(struct file
*filp
, struct kobject
*kobj
,
860 struct bin_attribute
*attr
,
861 struct vm_area_struct
*vma
)
863 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
866 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_mem
);
870 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
871 * @filp: open sysfs file
872 * @kobj: kobject corresponding to device to be mapped
873 * @attr: struct bin_attribute for this file
874 * @vma: struct vm_area_struct passed to mmap
876 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
877 * legacy IO space (first meg of bus space) into application virtual
878 * memory space. Returns -ENOSYS if the operation isn't supported
880 static int pci_mmap_legacy_io(struct file
*filp
, struct kobject
*kobj
,
881 struct bin_attribute
*attr
,
882 struct vm_area_struct
*vma
)
884 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
, struct device
,
887 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_io
);
891 * pci_adjust_legacy_attr - adjustment of legacy file attributes
892 * @b: bus to create files under
893 * @mmap_type: I/O port or memory
895 * Stub implementation. Can be overridden by arch if necessary.
897 void __weak
pci_adjust_legacy_attr(struct pci_bus
*b
,
898 enum pci_mmap_state mmap_type
)
903 * pci_create_legacy_files - create legacy I/O port and memory files
904 * @b: bus to create files under
906 * Some platforms allow access to legacy I/O port and ISA memory space on
907 * a per-bus basis. This routine creates the files and ties them into
908 * their associated read, write and mmap files from pci-sysfs.c
910 * On error unwind, but don't propagate the error to the caller
911 * as it is ok to set up the PCI bus without these files.
913 void pci_create_legacy_files(struct pci_bus
*b
)
917 b
->legacy_io
= kzalloc(sizeof(struct bin_attribute
) * 2,
922 sysfs_bin_attr_init(b
->legacy_io
);
923 b
->legacy_io
->attr
.name
= "legacy_io";
924 b
->legacy_io
->size
= 0xffff;
925 b
->legacy_io
->attr
.mode
= S_IRUSR
| S_IWUSR
;
926 b
->legacy_io
->read
= pci_read_legacy_io
;
927 b
->legacy_io
->write
= pci_write_legacy_io
;
928 b
->legacy_io
->mmap
= pci_mmap_legacy_io
;
929 pci_adjust_legacy_attr(b
, pci_mmap_io
);
930 error
= device_create_bin_file(&b
->dev
, b
->legacy_io
);
934 /* Allocated above after the legacy_io struct */
935 b
->legacy_mem
= b
->legacy_io
+ 1;
936 sysfs_bin_attr_init(b
->legacy_mem
);
937 b
->legacy_mem
->attr
.name
= "legacy_mem";
938 b
->legacy_mem
->size
= 1024*1024;
939 b
->legacy_mem
->attr
.mode
= S_IRUSR
| S_IWUSR
;
940 b
->legacy_mem
->mmap
= pci_mmap_legacy_mem
;
941 pci_adjust_legacy_attr(b
, pci_mmap_mem
);
942 error
= device_create_bin_file(&b
->dev
, b
->legacy_mem
);
949 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
954 printk(KERN_WARNING
"pci: warning: could not create legacy I/O port and ISA memory resources to sysfs\n");
958 void pci_remove_legacy_files(struct pci_bus
*b
)
961 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
962 device_remove_bin_file(&b
->dev
, b
->legacy_mem
);
963 kfree(b
->legacy_io
); /* both are allocated here */
966 #endif /* HAVE_PCI_LEGACY */
970 int pci_mmap_fits(struct pci_dev
*pdev
, int resno
, struct vm_area_struct
*vma
,
971 enum pci_mmap_api mmap_api
)
973 unsigned long nr
, start
, size
, pci_start
;
975 if (pci_resource_len(pdev
, resno
) == 0)
978 start
= vma
->vm_pgoff
;
979 size
= ((pci_resource_len(pdev
, resno
) - 1) >> PAGE_SHIFT
) + 1;
980 pci_start
= (mmap_api
== PCI_MMAP_PROCFS
) ?
981 pci_resource_start(pdev
, resno
) >> PAGE_SHIFT
: 0;
982 if (start
>= pci_start
&& start
< pci_start
+ size
&&
983 start
+ nr
<= pci_start
+ size
)
989 * pci_mmap_resource - map a PCI resource into user memory space
990 * @kobj: kobject for mapping
991 * @attr: struct bin_attribute for the file being mapped
992 * @vma: struct vm_area_struct passed into the mmap
993 * @write_combine: 1 for write_combine mapping
995 * Use the regular PCI mapping routines to map a PCI resource into userspace.
997 static int pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
998 struct vm_area_struct
*vma
, int write_combine
)
1000 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
1001 struct device
, kobj
));
1002 struct resource
*res
= attr
->private;
1003 enum pci_mmap_state mmap_type
;
1004 resource_size_t start
, end
;
1007 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
1008 if (res
== &pdev
->resource
[i
])
1010 if (i
>= PCI_ROM_RESOURCE
)
1013 if (!pci_mmap_fits(pdev
, i
, vma
, PCI_MMAP_SYSFS
)) {
1014 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",
1015 current
->comm
, vma
->vm_end
-vma
->vm_start
, vma
->vm_pgoff
,
1017 (u64
)pci_resource_start(pdev
, i
),
1018 (u64
)pci_resource_len(pdev
, i
));
1022 /* pci_mmap_page_range() expects the same kind of entry as coming
1023 * from /proc/bus/pci/ which is a "user visible" value. If this is
1024 * different from the resource itself, arch will do necessary fixup.
1026 pci_resource_to_user(pdev
, i
, res
, &start
, &end
);
1027 vma
->vm_pgoff
+= start
>> PAGE_SHIFT
;
1028 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
1030 if (res
->flags
& IORESOURCE_MEM
&& iomem_is_exclusive(start
))
1033 return pci_mmap_page_range(pdev
, vma
, mmap_type
, write_combine
);
1036 static int pci_mmap_resource_uc(struct file
*filp
, struct kobject
*kobj
,
1037 struct bin_attribute
*attr
,
1038 struct vm_area_struct
*vma
)
1040 return pci_mmap_resource(kobj
, attr
, vma
, 0);
1043 static int pci_mmap_resource_wc(struct file
*filp
, struct kobject
*kobj
,
1044 struct bin_attribute
*attr
,
1045 struct vm_area_struct
*vma
)
1047 return pci_mmap_resource(kobj
, attr
, vma
, 1);
1050 static ssize_t
pci_resource_io(struct file
*filp
, struct kobject
*kobj
,
1051 struct bin_attribute
*attr
, char *buf
,
1052 loff_t off
, size_t count
, bool write
)
1054 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
1055 struct device
, kobj
));
1056 struct resource
*res
= attr
->private;
1057 unsigned long port
= off
;
1060 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
1061 if (res
== &pdev
->resource
[i
])
1063 if (i
>= PCI_ROM_RESOURCE
)
1066 port
+= pci_resource_start(pdev
, i
);
1068 if (port
> pci_resource_end(pdev
, i
))
1071 if (port
+ count
- 1 > pci_resource_end(pdev
, i
))
1077 outb(*(u8
*)buf
, port
);
1079 *(u8
*)buf
= inb(port
);
1083 outw(*(u16
*)buf
, port
);
1085 *(u16
*)buf
= inw(port
);
1089 outl(*(u32
*)buf
, port
);
1091 *(u32
*)buf
= inl(port
);
1097 static ssize_t
pci_read_resource_io(struct file
*filp
, struct kobject
*kobj
,
1098 struct bin_attribute
*attr
, char *buf
,
1099 loff_t off
, size_t count
)
1101 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, false);
1104 static ssize_t
pci_write_resource_io(struct file
*filp
, struct kobject
*kobj
,
1105 struct bin_attribute
*attr
, char *buf
,
1106 loff_t off
, size_t count
)
1108 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, true);
1112 * pci_remove_resource_files - cleanup resource files
1113 * @pdev: dev to cleanup
1115 * If we created resource files for @pdev, remove them from sysfs and
1116 * free their resources.
1118 static void pci_remove_resource_files(struct pci_dev
*pdev
)
1122 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1123 struct bin_attribute
*res_attr
;
1125 res_attr
= pdev
->res_attr
[i
];
1127 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1131 res_attr
= pdev
->res_attr_wc
[i
];
1133 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
1139 static int pci_create_attr(struct pci_dev
*pdev
, int num
, int write_combine
)
1141 /* allocate attribute structure, piggyback attribute name */
1142 int name_len
= write_combine
? 13 : 10;
1143 struct bin_attribute
*res_attr
;
1146 res_attr
= kzalloc(sizeof(*res_attr
) + name_len
, GFP_ATOMIC
);
1148 char *res_attr_name
= (char *)(res_attr
+ 1);
1150 sysfs_bin_attr_init(res_attr
);
1151 if (write_combine
) {
1152 pdev
->res_attr_wc
[num
] = res_attr
;
1153 sprintf(res_attr_name
, "resource%d_wc", num
);
1154 res_attr
->mmap
= pci_mmap_resource_wc
;
1156 pdev
->res_attr
[num
] = res_attr
;
1157 sprintf(res_attr_name
, "resource%d", num
);
1158 res_attr
->mmap
= pci_mmap_resource_uc
;
1160 if (pci_resource_flags(pdev
, num
) & IORESOURCE_IO
) {
1161 res_attr
->read
= pci_read_resource_io
;
1162 res_attr
->write
= pci_write_resource_io
;
1164 res_attr
->attr
.name
= res_attr_name
;
1165 res_attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1166 res_attr
->size
= pci_resource_len(pdev
, num
);
1167 res_attr
->private = &pdev
->resource
[num
];
1168 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
1176 * pci_create_resource_files - create resource files in sysfs for @dev
1177 * @pdev: dev in question
1179 * Walk the resources in @pdev creating files for each resource available.
1181 static int pci_create_resource_files(struct pci_dev
*pdev
)
1186 /* Expose the PCI resources from this device as files */
1187 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1189 /* skip empty resources */
1190 if (!pci_resource_len(pdev
, i
))
1193 retval
= pci_create_attr(pdev
, i
, 0);
1194 /* for prefetchable resources, create a WC mappable file */
1195 if (!retval
&& pdev
->resource
[i
].flags
& IORESOURCE_PREFETCH
)
1196 retval
= pci_create_attr(pdev
, i
, 1);
1199 pci_remove_resource_files(pdev
);
1205 #else /* !HAVE_PCI_MMAP */
1206 int __weak
pci_create_resource_files(struct pci_dev
*dev
) { return 0; }
1207 void __weak
pci_remove_resource_files(struct pci_dev
*dev
) { return; }
1208 #endif /* HAVE_PCI_MMAP */
1211 * pci_write_rom - used to enable access to the PCI ROM display
1213 * @kobj: kernel object handle
1214 * @bin_attr: struct bin_attribute for this file
1217 * @count: number of byte in input
1219 * writing anything except 0 enables it
1221 static ssize_t
pci_write_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
));
1227 if ((off
== 0) && (*buf
== '0') && (count
== 2))
1228 pdev
->rom_attr_enabled
= 0;
1230 pdev
->rom_attr_enabled
= 1;
1236 * pci_read_rom - read a PCI ROM
1238 * @kobj: kernel object handle
1239 * @bin_attr: struct bin_attribute for this file
1240 * @buf: where to put the data we read from the ROM
1242 * @count: number of bytes to read
1244 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1245 * device corresponding to @kobj.
1247 static ssize_t
pci_read_rom(struct file
*filp
, struct kobject
*kobj
,
1248 struct bin_attribute
*bin_attr
, char *buf
,
1249 loff_t off
, size_t count
)
1251 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1255 if (!pdev
->rom_attr_enabled
)
1258 rom
= pci_map_rom(pdev
, &size
); /* size starts out as PCI window size */
1265 if (off
+ count
> size
)
1268 memcpy_fromio(buf
, rom
+ off
, count
);
1270 pci_unmap_rom(pdev
, rom
);
1275 static struct bin_attribute pci_config_attr
= {
1278 .mode
= S_IRUGO
| S_IWUSR
,
1280 .size
= PCI_CFG_SPACE_SIZE
,
1281 .read
= pci_read_config
,
1282 .write
= pci_write_config
,
1285 static struct bin_attribute pcie_config_attr
= {
1288 .mode
= S_IRUGO
| S_IWUSR
,
1290 .size
= PCI_CFG_SPACE_EXP_SIZE
,
1291 .read
= pci_read_config
,
1292 .write
= pci_write_config
,
1295 static ssize_t
reset_store(struct device
*dev
, struct device_attribute
*attr
,
1296 const char *buf
, size_t count
)
1298 struct pci_dev
*pdev
= to_pci_dev(dev
);
1300 ssize_t result
= kstrtoul(buf
, 0, &val
);
1308 result
= pci_reset_function(pdev
);
1315 static struct device_attribute reset_attr
= __ATTR(reset
, 0200, NULL
, reset_store
);
1317 static int pci_create_capabilities_sysfs(struct pci_dev
*dev
)
1320 struct bin_attribute
*attr
;
1322 /* If the device has VPD, try to expose it in sysfs. */
1324 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1328 sysfs_bin_attr_init(attr
);
1329 attr
->size
= dev
->vpd
->len
;
1330 attr
->attr
.name
= "vpd";
1331 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1332 attr
->read
= read_vpd_attr
;
1333 attr
->write
= write_vpd_attr
;
1334 retval
= sysfs_create_bin_file(&dev
->dev
.kobj
, attr
);
1339 dev
->vpd
->attr
= attr
;
1342 /* Active State Power Management */
1343 pcie_aspm_create_sysfs_dev_files(dev
);
1345 if (!pci_probe_reset_function(dev
)) {
1346 retval
= device_create_file(&dev
->dev
, &reset_attr
);
1354 pcie_aspm_remove_sysfs_dev_files(dev
);
1355 if (dev
->vpd
&& dev
->vpd
->attr
) {
1356 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1357 kfree(dev
->vpd
->attr
);
1363 int __must_check
pci_create_sysfs_dev_files(struct pci_dev
*pdev
)
1367 struct bin_attribute
*attr
;
1369 if (!sysfs_initialized
)
1372 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1373 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1375 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1379 retval
= pci_create_resource_files(pdev
);
1381 goto err_config_file
;
1383 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1384 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1385 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1388 /* If the device has a ROM, try to expose it in sysfs. */
1390 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1393 goto err_resource_files
;
1395 sysfs_bin_attr_init(attr
);
1396 attr
->size
= rom_size
;
1397 attr
->attr
.name
= "rom";
1398 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1399 attr
->read
= pci_read_rom
;
1400 attr
->write
= pci_write_rom
;
1401 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, attr
);
1404 goto err_resource_files
;
1406 pdev
->rom_attr
= attr
;
1409 /* add sysfs entries for various capabilities */
1410 retval
= pci_create_capabilities_sysfs(pdev
);
1414 pci_create_firmware_label_files(pdev
);
1420 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1421 kfree(pdev
->rom_attr
);
1422 pdev
->rom_attr
= NULL
;
1425 pci_remove_resource_files(pdev
);
1427 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1428 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1430 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1435 static void pci_remove_capabilities_sysfs(struct pci_dev
*dev
)
1437 if (dev
->vpd
&& dev
->vpd
->attr
) {
1438 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1439 kfree(dev
->vpd
->attr
);
1442 pcie_aspm_remove_sysfs_dev_files(dev
);
1443 if (dev
->reset_fn
) {
1444 device_remove_file(&dev
->dev
, &reset_attr
);
1450 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1451 * @pdev: device whose entries we should free
1453 * Cleanup when @pdev is removed from sysfs.
1455 void pci_remove_sysfs_dev_files(struct pci_dev
*pdev
)
1459 if (!sysfs_initialized
)
1462 pci_remove_capabilities_sysfs(pdev
);
1464 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1465 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1467 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1469 pci_remove_resource_files(pdev
);
1471 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1472 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1473 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1476 if (rom_size
&& pdev
->rom_attr
) {
1477 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1478 kfree(pdev
->rom_attr
);
1481 pci_remove_firmware_label_files(pdev
);
1485 static int __init
pci_sysfs_init(void)
1487 struct pci_dev
*pdev
= NULL
;
1490 sysfs_initialized
= 1;
1491 for_each_pci_dev(pdev
) {
1492 retval
= pci_create_sysfs_dev_files(pdev
);
1501 late_initcall(pci_sysfs_init
);
1503 static struct attribute
*pci_dev_dev_attrs
[] = {
1508 static umode_t
pci_dev_attrs_are_visible(struct kobject
*kobj
,
1509 struct attribute
*a
, int n
)
1511 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1512 struct pci_dev
*pdev
= to_pci_dev(dev
);
1514 if (a
== &vga_attr
.attr
)
1515 if ((pdev
->class >> 8) != PCI_CLASS_DISPLAY_VGA
)
1521 static struct attribute
*pci_dev_hp_attrs
[] = {
1522 &dev_remove_attr
.attr
,
1523 &dev_rescan_attr
.attr
,
1527 static umode_t
pci_dev_hp_attrs_are_visible(struct kobject
*kobj
,
1528 struct attribute
*a
, int n
)
1530 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1531 struct pci_dev
*pdev
= to_pci_dev(dev
);
1533 if (pdev
->is_virtfn
)
1539 static struct attribute_group pci_dev_hp_attr_group
= {
1540 .attrs
= pci_dev_hp_attrs
,
1541 .is_visible
= pci_dev_hp_attrs_are_visible
,
1544 #ifdef CONFIG_PCI_IOV
1545 static struct attribute
*sriov_dev_attrs
[] = {
1546 &sriov_totalvfs_attr
.attr
,
1547 &sriov_numvfs_attr
.attr
,
1551 static umode_t
sriov_attrs_are_visible(struct kobject
*kobj
,
1552 struct attribute
*a
, int n
)
1554 struct device
*dev
= container_of(kobj
, struct device
, kobj
);
1556 if (!dev_is_pf(dev
))
1562 static struct attribute_group sriov_dev_attr_group
= {
1563 .attrs
= sriov_dev_attrs
,
1564 .is_visible
= sriov_attrs_are_visible
,
1566 #endif /* CONFIG_PCI_IOV */
1568 static struct attribute_group pci_dev_attr_group
= {
1569 .attrs
= pci_dev_dev_attrs
,
1570 .is_visible
= pci_dev_attrs_are_visible
,
1573 static const struct attribute_group
*pci_dev_attr_groups
[] = {
1574 &pci_dev_attr_group
,
1575 &pci_dev_hp_attr_group
,
1576 #ifdef CONFIG_PCI_IOV
1577 &sriov_dev_attr_group
,
1582 struct device_type pci_dev_type
= {
1583 .groups
= pci_dev_attr_groups
,