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/pci.h>
20 #include <linux/stat.h>
21 #include <linux/topology.h>
23 #include <linux/capability.h>
24 #include <linux/aspm.h>
27 static int sysfs_initialized
; /* = 0 */
29 /* show configuration fields */
30 #define pci_config_attr(field, format_string) \
32 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
34 struct pci_dev *pdev; \
36 pdev = to_pci_dev (dev); \
37 return sprintf (buf, format_string, pdev->field); \
40 pci_config_attr(vendor
, "0x%04x\n");
41 pci_config_attr(device
, "0x%04x\n");
42 pci_config_attr(subsystem_vendor
, "0x%04x\n");
43 pci_config_attr(subsystem_device
, "0x%04x\n");
44 pci_config_attr(class, "0x%06x\n");
45 pci_config_attr(irq
, "%u\n");
47 static ssize_t
broken_parity_status_show(struct device
*dev
,
48 struct device_attribute
*attr
,
51 struct pci_dev
*pdev
= to_pci_dev(dev
);
52 return sprintf (buf
, "%u\n", pdev
->broken_parity_status
);
55 static ssize_t
broken_parity_status_store(struct device
*dev
,
56 struct device_attribute
*attr
,
57 const char *buf
, size_t count
)
59 struct pci_dev
*pdev
= to_pci_dev(dev
);
60 ssize_t consumed
= -EINVAL
;
62 if ((count
> 0) && (*buf
== '0' || *buf
== '1')) {
63 pdev
->broken_parity_status
= *buf
== '1' ? 1 : 0;
69 static ssize_t
local_cpus_show(struct device
*dev
,
70 struct device_attribute
*attr
, char *buf
)
75 mask
= pcibus_to_cpumask(to_pci_dev(dev
)->bus
);
76 len
= cpumask_scnprintf(buf
, PAGE_SIZE
-2, mask
);
83 resource_show(struct device
* dev
, struct device_attribute
*attr
, char * buf
)
85 struct pci_dev
* pci_dev
= to_pci_dev(dev
);
89 resource_size_t start
, end
;
91 if (pci_dev
->subordinate
)
92 max
= DEVICE_COUNT_RESOURCE
;
94 for (i
= 0; i
< max
; i
++) {
95 struct resource
*res
= &pci_dev
->resource
[i
];
96 pci_resource_to_user(pci_dev
, i
, res
, &start
, &end
);
97 str
+= sprintf(str
,"0x%016llx 0x%016llx 0x%016llx\n",
98 (unsigned long long)start
,
99 (unsigned long long)end
,
100 (unsigned long long)res
->flags
);
105 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
107 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
109 return sprintf(buf
, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
110 pci_dev
->vendor
, pci_dev
->device
,
111 pci_dev
->subsystem_vendor
, pci_dev
->subsystem_device
,
112 (u8
)(pci_dev
->class >> 16), (u8
)(pci_dev
->class >> 8),
113 (u8
)(pci_dev
->class));
116 static ssize_t
is_enabled_store(struct device
*dev
,
117 struct device_attribute
*attr
, const char *buf
,
120 ssize_t result
= -EINVAL
;
121 struct pci_dev
*pdev
= to_pci_dev(dev
);
123 /* this can crash the machine when done on the "wrong" device */
124 if (!capable(CAP_SYS_ADMIN
))
128 if (atomic_read(&pdev
->enable_cnt
) != 0)
129 pci_disable_device(pdev
);
132 } else if (*buf
== '1')
133 result
= pci_enable_device(pdev
);
135 return result
< 0 ? result
: count
;
138 static ssize_t
is_enabled_show(struct device
*dev
,
139 struct device_attribute
*attr
, char *buf
)
141 struct pci_dev
*pdev
;
143 pdev
= to_pci_dev (dev
);
144 return sprintf (buf
, "%u\n", atomic_read(&pdev
->enable_cnt
));
149 numa_node_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
151 return sprintf (buf
, "%d\n", dev
->numa_node
);
156 msi_bus_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
158 struct pci_dev
*pdev
= to_pci_dev(dev
);
160 if (!pdev
->subordinate
)
163 return sprintf (buf
, "%u\n",
164 !(pdev
->subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
));
168 msi_bus_store(struct device
*dev
, struct device_attribute
*attr
,
169 const char *buf
, size_t count
)
171 struct pci_dev
*pdev
= to_pci_dev(dev
);
173 /* bad things may happen if the no_msi flag is changed
174 * while some drivers are loaded */
175 if (!capable(CAP_SYS_ADMIN
))
178 if (!pdev
->subordinate
)
182 pdev
->subordinate
->bus_flags
|= PCI_BUS_FLAGS_NO_MSI
;
183 dev_warn(&pdev
->dev
, "forced subordinate bus to not support MSI,"
184 " bad things could happen.\n");
188 pdev
->subordinate
->bus_flags
&= ~PCI_BUS_FLAGS_NO_MSI
;
189 dev_warn(&pdev
->dev
, "forced subordinate bus to support MSI,"
190 " bad things could happen.\n");
196 struct device_attribute pci_dev_attrs
[] = {
200 __ATTR_RO(subsystem_vendor
),
201 __ATTR_RO(subsystem_device
),
204 __ATTR_RO(local_cpus
),
207 __ATTR_RO(numa_node
),
209 __ATTR(enable
, 0600, is_enabled_show
, is_enabled_store
),
210 __ATTR(broken_parity_status
,(S_IRUGO
|S_IWUSR
),
211 broken_parity_status_show
,broken_parity_status_store
),
212 __ATTR(msi_bus
, 0644, msi_bus_show
, msi_bus_store
),
217 pci_read_config(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
218 char *buf
, loff_t off
, size_t count
)
220 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
,struct device
,kobj
));
221 unsigned int size
= 64;
222 loff_t init_off
= off
;
223 u8
*data
= (u8
*) buf
;
225 /* Several chips lock up trying to read undefined config space */
226 if (capable(CAP_SYS_ADMIN
)) {
227 size
= dev
->cfg_size
;
228 } else if (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
) {
234 if (off
+ count
> size
) {
241 if ((off
& 1) && size
) {
243 pci_user_read_config_byte(dev
, off
, &val
);
244 data
[off
- init_off
] = val
;
249 if ((off
& 3) && size
> 2) {
251 pci_user_read_config_word(dev
, off
, &val
);
252 data
[off
- init_off
] = val
& 0xff;
253 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
260 pci_user_read_config_dword(dev
, off
, &val
);
261 data
[off
- init_off
] = val
& 0xff;
262 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
263 data
[off
- init_off
+ 2] = (val
>> 16) & 0xff;
264 data
[off
- init_off
+ 3] = (val
>> 24) & 0xff;
271 pci_user_read_config_word(dev
, off
, &val
);
272 data
[off
- init_off
] = val
& 0xff;
273 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
280 pci_user_read_config_byte(dev
, off
, &val
);
281 data
[off
- init_off
] = val
;
290 pci_write_config(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
291 char *buf
, loff_t off
, size_t count
)
293 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
,struct device
,kobj
));
294 unsigned int size
= count
;
295 loff_t init_off
= off
;
296 u8
*data
= (u8
*) buf
;
298 if (off
> dev
->cfg_size
)
300 if (off
+ count
> dev
->cfg_size
) {
301 size
= dev
->cfg_size
- off
;
305 if ((off
& 1) && size
) {
306 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
311 if ((off
& 3) && size
> 2) {
312 u16 val
= data
[off
- init_off
];
313 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
314 pci_user_write_config_word(dev
, off
, val
);
320 u32 val
= data
[off
- init_off
];
321 val
|= (u32
) data
[off
- init_off
+ 1] << 8;
322 val
|= (u32
) data
[off
- init_off
+ 2] << 16;
323 val
|= (u32
) data
[off
- init_off
+ 3] << 24;
324 pci_user_write_config_dword(dev
, off
, val
);
330 u16 val
= data
[off
- init_off
];
331 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
332 pci_user_write_config_word(dev
, off
, val
);
338 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
346 #ifdef HAVE_PCI_LEGACY
348 * pci_read_legacy_io - read byte(s) from legacy I/O port space
349 * @kobj: kobject corresponding to file to read from
350 * @buf: buffer to store results
351 * @off: offset into legacy I/O port space
352 * @count: number of bytes to read
354 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
355 * callback routine (pci_legacy_read).
358 pci_read_legacy_io(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
359 char *buf
, loff_t off
, size_t count
)
361 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
365 /* Only support 1, 2 or 4 byte accesses */
366 if (count
!= 1 && count
!= 2 && count
!= 4)
369 return pci_legacy_read(bus
, off
, (u32
*)buf
, count
);
373 * pci_write_legacy_io - write byte(s) to legacy I/O port space
374 * @kobj: kobject corresponding to file to read from
375 * @buf: buffer containing value to be written
376 * @off: offset into legacy I/O port space
377 * @count: number of bytes to write
379 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
380 * callback routine (pci_legacy_write).
383 pci_write_legacy_io(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
384 char *buf
, loff_t off
, size_t count
)
386 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
389 /* Only support 1, 2 or 4 byte accesses */
390 if (count
!= 1 && count
!= 2 && count
!= 4)
393 return pci_legacy_write(bus
, off
, *(u32
*)buf
, count
);
397 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
398 * @kobj: kobject corresponding to device to be mapped
399 * @attr: struct bin_attribute for this file
400 * @vma: struct vm_area_struct passed to mmap
402 * Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap
403 * legacy memory space (first meg of bus space) into application virtual
407 pci_mmap_legacy_mem(struct kobject
*kobj
, struct bin_attribute
*attr
,
408 struct vm_area_struct
*vma
)
410 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
414 return pci_mmap_legacy_page_range(bus
, vma
);
416 #endif /* HAVE_PCI_LEGACY */
420 * pci_mmap_resource - map a PCI resource into user memory space
421 * @kobj: kobject for mapping
422 * @attr: struct bin_attribute for the file being mapped
423 * @vma: struct vm_area_struct passed into the mmap
425 * Use the regular PCI mapping routines to map a PCI resource into userspace.
426 * FIXME: write combining? maybe automatic for prefetchable regions?
429 pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
430 struct vm_area_struct
*vma
)
432 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
433 struct device
, kobj
));
434 struct resource
*res
= (struct resource
*)attr
->private;
435 enum pci_mmap_state mmap_type
;
436 resource_size_t start
, end
;
439 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
440 if (res
== &pdev
->resource
[i
])
442 if (i
>= PCI_ROM_RESOURCE
)
445 /* pci_mmap_page_range() expects the same kind of entry as coming
446 * from /proc/bus/pci/ which is a "user visible" value. If this is
447 * different from the resource itself, arch will do necessary fixup.
449 pci_resource_to_user(pdev
, i
, res
, &start
, &end
);
450 vma
->vm_pgoff
+= start
>> PAGE_SHIFT
;
451 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
453 return pci_mmap_page_range(pdev
, vma
, mmap_type
, 0);
457 * pci_remove_resource_files - cleanup resource files
458 * @dev: dev to cleanup
460 * If we created resource files for @dev, remove them from sysfs and
461 * free their resources.
464 pci_remove_resource_files(struct pci_dev
*pdev
)
468 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
469 struct bin_attribute
*res_attr
;
471 res_attr
= pdev
->res_attr
[i
];
473 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
480 * pci_create_resource_files - create resource files in sysfs for @dev
481 * @dev: dev in question
483 * Walk the resources in @dev creating files for each resource available.
485 static int pci_create_resource_files(struct pci_dev
*pdev
)
490 /* Expose the PCI resources from this device as files */
491 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
492 struct bin_attribute
*res_attr
;
494 /* skip empty resources */
495 if (!pci_resource_len(pdev
, i
))
498 /* allocate attribute structure, piggyback attribute name */
499 res_attr
= kzalloc(sizeof(*res_attr
) + 10, GFP_ATOMIC
);
501 char *res_attr_name
= (char *)(res_attr
+ 1);
503 pdev
->res_attr
[i
] = res_attr
;
504 sprintf(res_attr_name
, "resource%d", i
);
505 res_attr
->attr
.name
= res_attr_name
;
506 res_attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
507 res_attr
->size
= pci_resource_len(pdev
, i
);
508 res_attr
->mmap
= pci_mmap_resource
;
509 res_attr
->private = &pdev
->resource
[i
];
510 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
512 pci_remove_resource_files(pdev
);
521 #else /* !HAVE_PCI_MMAP */
522 static inline int pci_create_resource_files(struct pci_dev
*dev
) { return 0; }
523 static inline void pci_remove_resource_files(struct pci_dev
*dev
) { return; }
524 #endif /* HAVE_PCI_MMAP */
527 * pci_write_rom - used to enable access to the PCI ROM display
528 * @kobj: kernel object handle
531 * @count: number of byte in input
533 * writing anything except 0 enables it
536 pci_write_rom(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
537 char *buf
, loff_t off
, size_t count
)
539 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
541 if ((off
== 0) && (*buf
== '0') && (count
== 2))
542 pdev
->rom_attr_enabled
= 0;
544 pdev
->rom_attr_enabled
= 1;
550 * pci_read_rom - read a PCI ROM
551 * @kobj: kernel object handle
552 * @buf: where to put the data we read from the ROM
554 * @count: number of bytes to read
556 * Put @count bytes starting at @off into @buf from the ROM in the PCI
557 * device corresponding to @kobj.
560 pci_read_rom(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
561 char *buf
, loff_t off
, size_t count
)
563 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
567 if (!pdev
->rom_attr_enabled
)
570 rom
= pci_map_rom(pdev
, &size
); /* size starts out as PCI window size */
577 if (off
+ count
> size
)
580 memcpy_fromio(buf
, rom
+ off
, count
);
582 pci_unmap_rom(pdev
, rom
);
587 static struct bin_attribute pci_config_attr
= {
590 .mode
= S_IRUGO
| S_IWUSR
,
593 .read
= pci_read_config
,
594 .write
= pci_write_config
,
597 static struct bin_attribute pcie_config_attr
= {
600 .mode
= S_IRUGO
| S_IWUSR
,
603 .read
= pci_read_config
,
604 .write
= pci_write_config
,
607 int __attribute__ ((weak
)) pcibios_add_platform_entries(struct pci_dev
*dev
)
612 int __must_check
pci_create_sysfs_dev_files (struct pci_dev
*pdev
)
614 struct bin_attribute
*rom_attr
= NULL
;
617 if (!sysfs_initialized
)
620 if (pdev
->cfg_size
< 4096)
621 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
623 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
627 retval
= pci_create_resource_files(pdev
);
631 /* If the device has a ROM, try to expose it in sysfs. */
632 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
) ||
633 (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)) {
634 rom_attr
= kzalloc(sizeof(*rom_attr
), GFP_ATOMIC
);
636 pdev
->rom_attr
= rom_attr
;
637 rom_attr
->size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
638 rom_attr
->attr
.name
= "rom";
639 rom_attr
->attr
.mode
= S_IRUSR
;
640 rom_attr
->read
= pci_read_rom
;
641 rom_attr
->write
= pci_write_rom
;
642 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, rom_attr
);
647 goto err_resource_files
;
650 /* add platform-specific attributes */
651 if (pcibios_add_platform_entries(pdev
))
654 pcie_aspm_create_sysfs_dev_files(pdev
);
659 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
660 sysfs_remove_bin_file(&pdev
->dev
.kobj
, rom_attr
);
664 pci_remove_resource_files(pdev
);
666 if (pdev
->cfg_size
< 4096)
667 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
669 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
675 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
676 * @pdev: device whose entries we should free
678 * Cleanup when @pdev is removed from sysfs.
680 void pci_remove_sysfs_dev_files(struct pci_dev
*pdev
)
682 if (!sysfs_initialized
)
685 pcie_aspm_remove_sysfs_dev_files(pdev
);
687 if (pdev
->cfg_size
< 4096)
688 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
690 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
692 pci_remove_resource_files(pdev
);
694 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
)) {
695 if (pdev
->rom_attr
) {
696 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
697 kfree(pdev
->rom_attr
);
702 static int __init
pci_sysfs_init(void)
704 struct pci_dev
*pdev
= NULL
;
707 sysfs_initialized
= 1;
708 for_each_pci_dev(pdev
) {
709 retval
= pci_create_sysfs_dev_files(pdev
);
719 late_initcall(pci_sysfs_init
);