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/config.h>
19 #include <linux/kernel.h>
20 #include <linux/pci.h>
21 #include <linux/stat.h>
22 #include <linux/topology.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");
46 pci_config_attr(is_enabled
, "%u\n");
48 static ssize_t
broken_parity_status_show(struct device
*dev
,
49 struct device_attribute
*attr
,
52 struct pci_dev
*pdev
= to_pci_dev(dev
);
53 return sprintf (buf
, "%u\n", pdev
->broken_parity_status
);
56 static ssize_t
broken_parity_status_store(struct device
*dev
,
57 struct device_attribute
*attr
,
58 const char *buf
, size_t count
)
60 struct pci_dev
*pdev
= to_pci_dev(dev
);
61 ssize_t consumed
= -EINVAL
;
63 if ((count
> 0) && (*buf
== '0' || *buf
== '1')) {
64 pdev
->broken_parity_status
= *buf
== '1' ? 1 : 0;
70 static ssize_t
local_cpus_show(struct device
*dev
,
71 struct device_attribute
*attr
, char *buf
)
76 mask
= pcibus_to_cpumask(to_pci_dev(dev
)->bus
);
77 len
= cpumask_scnprintf(buf
, PAGE_SIZE
-2, mask
);
84 resource_show(struct device
* dev
, struct device_attribute
*attr
, char * buf
)
86 struct pci_dev
* pci_dev
= to_pci_dev(dev
);
90 resource_size_t start
, end
;
92 if (pci_dev
->subordinate
)
93 max
= DEVICE_COUNT_RESOURCE
;
95 for (i
= 0; i
< max
; i
++) {
96 struct resource
*res
= &pci_dev
->resource
[i
];
97 pci_resource_to_user(pci_dev
, i
, res
, &start
, &end
);
98 str
+= sprintf(str
,"0x%016llx 0x%016llx 0x%016llx\n",
99 (unsigned long long)start
,
100 (unsigned long long)end
,
101 (unsigned long long)res
->flags
);
106 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
108 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
110 return sprintf(buf
, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
111 pci_dev
->vendor
, pci_dev
->device
,
112 pci_dev
->subsystem_vendor
, pci_dev
->subsystem_device
,
113 (u8
)(pci_dev
->class >> 16), (u8
)(pci_dev
->class >> 8),
114 (u8
)(pci_dev
->class));
117 is_enabled_store(struct device
*dev
, struct device_attribute
*attr
,
118 const char *buf
, size_t count
)
120 struct pci_dev
*pdev
= to_pci_dev(dev
);
122 /* this can crash the machine when done on the "wrong" device */
123 if (!capable(CAP_SYS_ADMIN
))
127 pci_disable_device(pdev
);
130 pci_enable_device(pdev
);
136 struct device_attribute pci_dev_attrs
[] = {
140 __ATTR_RO(subsystem_vendor
),
141 __ATTR_RO(subsystem_device
),
144 __ATTR_RO(local_cpus
),
146 __ATTR(enable
, 0600, is_enabled_show
, is_enabled_store
),
147 __ATTR(broken_parity_status
,(S_IRUGO
|S_IWUSR
),
148 broken_parity_status_show
,broken_parity_status_store
),
153 pci_read_config(struct kobject
*kobj
, char *buf
, loff_t off
, size_t count
)
155 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
,struct device
,kobj
));
156 unsigned int size
= 64;
157 loff_t init_off
= off
;
158 u8
*data
= (u8
*) buf
;
160 /* Several chips lock up trying to read undefined config space */
161 if (capable(CAP_SYS_ADMIN
)) {
162 size
= dev
->cfg_size
;
163 } else if (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
) {
169 if (off
+ count
> size
) {
176 if ((off
& 1) && size
) {
178 pci_user_read_config_byte(dev
, off
, &val
);
179 data
[off
- init_off
] = val
;
184 if ((off
& 3) && size
> 2) {
186 pci_user_read_config_word(dev
, off
, &val
);
187 data
[off
- init_off
] = val
& 0xff;
188 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
195 pci_user_read_config_dword(dev
, off
, &val
);
196 data
[off
- init_off
] = val
& 0xff;
197 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
198 data
[off
- init_off
+ 2] = (val
>> 16) & 0xff;
199 data
[off
- init_off
+ 3] = (val
>> 24) & 0xff;
206 pci_user_read_config_word(dev
, off
, &val
);
207 data
[off
- init_off
] = val
& 0xff;
208 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
215 pci_user_read_config_byte(dev
, off
, &val
);
216 data
[off
- init_off
] = val
;
225 pci_write_config(struct kobject
*kobj
, char *buf
, loff_t off
, size_t count
)
227 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
,struct device
,kobj
));
228 unsigned int size
= count
;
229 loff_t init_off
= off
;
230 u8
*data
= (u8
*) buf
;
232 if (off
> dev
->cfg_size
)
234 if (off
+ count
> dev
->cfg_size
) {
235 size
= dev
->cfg_size
- off
;
239 if ((off
& 1) && size
) {
240 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
245 if ((off
& 3) && size
> 2) {
246 u16 val
= data
[off
- init_off
];
247 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
248 pci_user_write_config_word(dev
, off
, val
);
254 u32 val
= data
[off
- init_off
];
255 val
|= (u32
) data
[off
- init_off
+ 1] << 8;
256 val
|= (u32
) data
[off
- init_off
+ 2] << 16;
257 val
|= (u32
) data
[off
- init_off
+ 3] << 24;
258 pci_user_write_config_dword(dev
, off
, val
);
264 u16 val
= data
[off
- init_off
];
265 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
266 pci_user_write_config_word(dev
, off
, val
);
272 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
280 #ifdef HAVE_PCI_LEGACY
282 * pci_read_legacy_io - read byte(s) from legacy I/O port space
283 * @kobj: kobject corresponding to file to read from
284 * @buf: buffer to store results
285 * @off: offset into legacy I/O port space
286 * @count: number of bytes to read
288 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
289 * callback routine (pci_legacy_read).
292 pci_read_legacy_io(struct kobject
*kobj
, char *buf
, loff_t off
, size_t count
)
294 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
298 /* Only support 1, 2 or 4 byte accesses */
299 if (count
!= 1 && count
!= 2 && count
!= 4)
302 return pci_legacy_read(bus
, off
, (u32
*)buf
, count
);
306 * pci_write_legacy_io - write byte(s) to legacy I/O port space
307 * @kobj: kobject corresponding to file to read from
308 * @buf: buffer containing value to be written
309 * @off: offset into legacy I/O port space
310 * @count: number of bytes to write
312 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
313 * callback routine (pci_legacy_write).
316 pci_write_legacy_io(struct kobject
*kobj
, char *buf
, loff_t off
, size_t count
)
318 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
321 /* Only support 1, 2 or 4 byte accesses */
322 if (count
!= 1 && count
!= 2 && count
!= 4)
325 return pci_legacy_write(bus
, off
, *(u32
*)buf
, count
);
329 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
330 * @kobj: kobject corresponding to device to be mapped
331 * @attr: struct bin_attribute for this file
332 * @vma: struct vm_area_struct passed to mmap
334 * Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap
335 * legacy memory space (first meg of bus space) into application virtual
339 pci_mmap_legacy_mem(struct kobject
*kobj
, struct bin_attribute
*attr
,
340 struct vm_area_struct
*vma
)
342 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
346 return pci_mmap_legacy_page_range(bus
, vma
);
348 #endif /* HAVE_PCI_LEGACY */
352 * pci_mmap_resource - map a PCI resource into user memory space
353 * @kobj: kobject for mapping
354 * @attr: struct bin_attribute for the file being mapped
355 * @vma: struct vm_area_struct passed into the mmap
357 * Use the regular PCI mapping routines to map a PCI resource into userspace.
358 * FIXME: write combining? maybe automatic for prefetchable regions?
361 pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
362 struct vm_area_struct
*vma
)
364 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
365 struct device
, kobj
));
366 struct resource
*res
= (struct resource
*)attr
->private;
367 enum pci_mmap_state mmap_type
;
368 resource_size_t start
, end
;
371 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
372 if (res
== &pdev
->resource
[i
])
374 if (i
>= PCI_ROM_RESOURCE
)
377 /* pci_mmap_page_range() expects the same kind of entry as coming
378 * from /proc/bus/pci/ which is a "user visible" value. If this is
379 * different from the resource itself, arch will do necessary fixup.
381 pci_resource_to_user(pdev
, i
, res
, &start
, &end
);
382 vma
->vm_pgoff
+= start
>> PAGE_SHIFT
;
383 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
385 return pci_mmap_page_range(pdev
, vma
, mmap_type
, 0);
389 * pci_create_resource_files - create resource files in sysfs for @dev
390 * @dev: dev in question
392 * Walk the resources in @dev creating files for each resource available.
395 pci_create_resource_files(struct pci_dev
*pdev
)
399 /* Expose the PCI resources from this device as files */
400 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
401 struct bin_attribute
*res_attr
;
403 /* skip empty resources */
404 if (!pci_resource_len(pdev
, i
))
407 /* allocate attribute structure, piggyback attribute name */
408 res_attr
= kzalloc(sizeof(*res_attr
) + 10, GFP_ATOMIC
);
410 char *res_attr_name
= (char *)(res_attr
+ 1);
412 pdev
->res_attr
[i
] = res_attr
;
413 sprintf(res_attr_name
, "resource%d", i
);
414 res_attr
->attr
.name
= res_attr_name
;
415 res_attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
416 res_attr
->attr
.owner
= THIS_MODULE
;
417 res_attr
->size
= pci_resource_len(pdev
, i
);
418 res_attr
->mmap
= pci_mmap_resource
;
419 res_attr
->private = &pdev
->resource
[i
];
420 sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
426 * pci_remove_resource_files - cleanup resource files
427 * @dev: dev to cleanup
429 * If we created resource files for @dev, remove them from sysfs and
430 * free their resources.
433 pci_remove_resource_files(struct pci_dev
*pdev
)
437 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
438 struct bin_attribute
*res_attr
;
440 res_attr
= pdev
->res_attr
[i
];
442 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
447 #else /* !HAVE_PCI_MMAP */
448 static inline void pci_create_resource_files(struct pci_dev
*dev
) { return; }
449 static inline void pci_remove_resource_files(struct pci_dev
*dev
) { return; }
450 #endif /* HAVE_PCI_MMAP */
453 * pci_write_rom - used to enable access to the PCI ROM display
454 * @kobj: kernel object handle
457 * @count: number of byte in input
459 * writing anything except 0 enables it
462 pci_write_rom(struct kobject
*kobj
, char *buf
, loff_t off
, size_t count
)
464 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
466 if ((off
== 0) && (*buf
== '0') && (count
== 2))
467 pdev
->rom_attr_enabled
= 0;
469 pdev
->rom_attr_enabled
= 1;
475 * pci_read_rom - read a PCI ROM
476 * @kobj: kernel object handle
477 * @buf: where to put the data we read from the ROM
479 * @count: number of bytes to read
481 * Put @count bytes starting at @off into @buf from the ROM in the PCI
482 * device corresponding to @kobj.
485 pci_read_rom(struct kobject
*kobj
, char *buf
, loff_t off
, size_t count
)
487 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
491 if (!pdev
->rom_attr_enabled
)
494 rom
= pci_map_rom(pdev
, &size
); /* size starts out as PCI window size */
501 if (off
+ count
> size
)
504 memcpy_fromio(buf
, rom
+ off
, count
);
506 pci_unmap_rom(pdev
, rom
);
511 static struct bin_attribute pci_config_attr
= {
514 .mode
= S_IRUGO
| S_IWUSR
,
515 .owner
= THIS_MODULE
,
518 .read
= pci_read_config
,
519 .write
= pci_write_config
,
522 static struct bin_attribute pcie_config_attr
= {
525 .mode
= S_IRUGO
| S_IWUSR
,
526 .owner
= THIS_MODULE
,
529 .read
= pci_read_config
,
530 .write
= pci_write_config
,
533 int pci_create_sysfs_dev_files (struct pci_dev
*pdev
)
535 if (!sysfs_initialized
)
538 if (pdev
->cfg_size
< 4096)
539 sysfs_create_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
541 sysfs_create_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
543 pci_create_resource_files(pdev
);
545 /* If the device has a ROM, try to expose it in sysfs. */
546 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
)) {
547 struct bin_attribute
*rom_attr
;
549 rom_attr
= kzalloc(sizeof(*rom_attr
), GFP_ATOMIC
);
551 pdev
->rom_attr
= rom_attr
;
552 rom_attr
->size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
553 rom_attr
->attr
.name
= "rom";
554 rom_attr
->attr
.mode
= S_IRUSR
;
555 rom_attr
->attr
.owner
= THIS_MODULE
;
556 rom_attr
->read
= pci_read_rom
;
557 rom_attr
->write
= pci_write_rom
;
558 sysfs_create_bin_file(&pdev
->dev
.kobj
, rom_attr
);
561 /* add platform-specific attributes */
562 pcibios_add_platform_entries(pdev
);
568 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
569 * @pdev: device whose entries we should free
571 * Cleanup when @pdev is removed from sysfs.
573 void pci_remove_sysfs_dev_files(struct pci_dev
*pdev
)
575 if (pdev
->cfg_size
< 4096)
576 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
578 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
580 pci_remove_resource_files(pdev
);
582 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
)) {
583 if (pdev
->rom_attr
) {
584 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
585 kfree(pdev
->rom_attr
);
590 static int __init
pci_sysfs_init(void)
592 struct pci_dev
*pdev
= NULL
;
594 sysfs_initialized
= 1;
595 for_each_pci_dev(pdev
)
596 pci_create_sysfs_dev_files(pdev
);
601 __initcall(pci_sysfs_init
);