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/topology.h>
24 #include <linux/capability.h>
25 #include <linux/pci-aspm.h>
28 static int sysfs_initialized
; /* = 0 */
30 /* show configuration fields */
31 #define pci_config_attr(field, format_string) \
33 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
35 struct pci_dev *pdev; \
37 pdev = to_pci_dev (dev); \
38 return sprintf (buf, format_string, pdev->field); \
41 pci_config_attr(vendor
, "0x%04x\n");
42 pci_config_attr(device
, "0x%04x\n");
43 pci_config_attr(subsystem_vendor
, "0x%04x\n");
44 pci_config_attr(subsystem_device
, "0x%04x\n");
45 pci_config_attr(class, "0x%06x\n");
46 pci_config_attr(irq
, "%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
);
63 if (strict_strtoul(buf
, 0, &val
) < 0)
66 pdev
->broken_parity_status
= !!val
;
71 static ssize_t
local_cpus_show(struct device
*dev
,
72 struct device_attribute
*attr
, char *buf
)
74 const struct cpumask
*mask
;
78 mask
= (dev_to_node(dev
) == -1) ? cpu_online_mask
:
79 cpumask_of_node(dev_to_node(dev
));
81 mask
= cpumask_of_pcibus(to_pci_dev(dev
)->bus
);
83 len
= cpumask_scnprintf(buf
, PAGE_SIZE
-2, mask
);
90 static ssize_t
local_cpulist_show(struct device
*dev
,
91 struct device_attribute
*attr
, char *buf
)
93 const struct cpumask
*mask
;
97 mask
= (dev_to_node(dev
) == -1) ? cpu_online_mask
:
98 cpumask_of_node(dev_to_node(dev
));
100 mask
= cpumask_of_pcibus(to_pci_dev(dev
)->bus
);
102 len
= cpulist_scnprintf(buf
, PAGE_SIZE
-2, mask
);
110 resource_show(struct device
* dev
, struct device_attribute
*attr
, char * buf
)
112 struct pci_dev
* pci_dev
= to_pci_dev(dev
);
116 resource_size_t start
, end
;
118 if (pci_dev
->subordinate
)
119 max
= DEVICE_COUNT_RESOURCE
;
121 max
= PCI_BRIDGE_RESOURCES
;
123 for (i
= 0; i
< max
; i
++) {
124 struct resource
*res
= &pci_dev
->resource
[i
];
125 pci_resource_to_user(pci_dev
, i
, res
, &start
, &end
);
126 str
+= sprintf(str
,"0x%016llx 0x%016llx 0x%016llx\n",
127 (unsigned long long)start
,
128 (unsigned long long)end
,
129 (unsigned long long)res
->flags
);
134 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
136 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
138 return sprintf(buf
, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
139 pci_dev
->vendor
, pci_dev
->device
,
140 pci_dev
->subsystem_vendor
, pci_dev
->subsystem_device
,
141 (u8
)(pci_dev
->class >> 16), (u8
)(pci_dev
->class >> 8),
142 (u8
)(pci_dev
->class));
145 static ssize_t
is_enabled_store(struct device
*dev
,
146 struct device_attribute
*attr
, const char *buf
,
149 struct pci_dev
*pdev
= to_pci_dev(dev
);
151 ssize_t result
= strict_strtoul(buf
, 0, &val
);
156 /* this can crash the machine when done on the "wrong" device */
157 if (!capable(CAP_SYS_ADMIN
))
161 if (pci_is_enabled(pdev
))
162 pci_disable_device(pdev
);
166 result
= pci_enable_device(pdev
);
168 return result
< 0 ? result
: count
;
171 static ssize_t
is_enabled_show(struct device
*dev
,
172 struct device_attribute
*attr
, char *buf
)
174 struct pci_dev
*pdev
;
176 pdev
= to_pci_dev (dev
);
177 return sprintf (buf
, "%u\n", atomic_read(&pdev
->enable_cnt
));
182 numa_node_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
184 return sprintf (buf
, "%d\n", dev
->numa_node
);
189 dma_mask_bits_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
191 struct pci_dev
*pdev
= to_pci_dev(dev
);
193 return sprintf (buf
, "%d\n", fls64(pdev
->dma_mask
));
197 consistent_dma_mask_bits_show(struct device
*dev
, struct device_attribute
*attr
,
200 return sprintf (buf
, "%d\n", fls64(dev
->coherent_dma_mask
));
204 msi_bus_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
206 struct pci_dev
*pdev
= to_pci_dev(dev
);
208 if (!pdev
->subordinate
)
211 return sprintf (buf
, "%u\n",
212 !(pdev
->subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
));
216 msi_bus_store(struct device
*dev
, struct device_attribute
*attr
,
217 const char *buf
, size_t count
)
219 struct pci_dev
*pdev
= to_pci_dev(dev
);
222 if (strict_strtoul(buf
, 0, &val
) < 0)
225 /* bad things may happen if the no_msi flag is changed
226 * while some drivers are loaded */
227 if (!capable(CAP_SYS_ADMIN
))
230 /* Maybe pci devices without subordinate busses shouldn't even have this
231 * attribute in the first place? */
232 if (!pdev
->subordinate
)
235 /* Is the flag going to change, or keep the value it already had? */
236 if (!(pdev
->subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
) ^
238 pdev
->subordinate
->bus_flags
^= PCI_BUS_FLAGS_NO_MSI
;
240 dev_warn(&pdev
->dev
, "forced subordinate bus to%s support MSI,"
241 " bad things could happen\n", val
? "" : " not");
247 #ifdef CONFIG_HOTPLUG
248 static DEFINE_MUTEX(pci_remove_rescan_mutex
);
249 static ssize_t
bus_rescan_store(struct bus_type
*bus
, const char *buf
,
253 struct pci_bus
*b
= NULL
;
255 if (strict_strtoul(buf
, 0, &val
) < 0)
259 mutex_lock(&pci_remove_rescan_mutex
);
260 while ((b
= pci_find_next_bus(b
)) != NULL
)
262 mutex_unlock(&pci_remove_rescan_mutex
);
267 struct bus_attribute pci_bus_attrs
[] = {
268 __ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, bus_rescan_store
),
273 dev_rescan_store(struct device
*dev
, struct device_attribute
*attr
,
274 const char *buf
, size_t count
)
277 struct pci_dev
*pdev
= to_pci_dev(dev
);
279 if (strict_strtoul(buf
, 0, &val
) < 0)
283 mutex_lock(&pci_remove_rescan_mutex
);
284 pci_rescan_bus(pdev
->bus
);
285 mutex_unlock(&pci_remove_rescan_mutex
);
290 static void remove_callback(struct device
*dev
)
292 struct pci_dev
*pdev
= to_pci_dev(dev
);
294 mutex_lock(&pci_remove_rescan_mutex
);
295 pci_remove_bus_device(pdev
);
296 mutex_unlock(&pci_remove_rescan_mutex
);
300 remove_store(struct device
*dev
, struct device_attribute
*dummy
,
301 const char *buf
, size_t count
)
306 if (strict_strtoul(buf
, 0, &val
) < 0)
309 /* An attribute cannot be unregistered by one of its own methods,
310 * so we have to use this roundabout approach.
313 ret
= device_schedule_callback(dev
, remove_callback
);
320 struct device_attribute pci_dev_attrs
[] = {
324 __ATTR_RO(subsystem_vendor
),
325 __ATTR_RO(subsystem_device
),
328 __ATTR_RO(local_cpus
),
329 __ATTR_RO(local_cpulist
),
332 __ATTR_RO(numa_node
),
334 __ATTR_RO(dma_mask_bits
),
335 __ATTR_RO(consistent_dma_mask_bits
),
336 __ATTR(enable
, 0600, is_enabled_show
, is_enabled_store
),
337 __ATTR(broken_parity_status
,(S_IRUGO
|S_IWUSR
),
338 broken_parity_status_show
,broken_parity_status_store
),
339 __ATTR(msi_bus
, 0644, msi_bus_show
, msi_bus_store
),
340 #ifdef CONFIG_HOTPLUG
341 __ATTR(remove
, (S_IWUSR
|S_IWGRP
), NULL
, remove_store
),
342 __ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, dev_rescan_store
),
348 boot_vga_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
350 struct pci_dev
*pdev
= to_pci_dev(dev
);
352 return sprintf(buf
, "%u\n",
353 !!(pdev
->resource
[PCI_ROM_RESOURCE
].flags
&
354 IORESOURCE_ROM_SHADOW
));
356 struct device_attribute vga_attr
= __ATTR_RO(boot_vga
);
359 pci_read_config(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
360 char *buf
, loff_t off
, size_t count
)
362 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
,struct device
,kobj
));
363 unsigned int size
= 64;
364 loff_t init_off
= off
;
365 u8
*data
= (u8
*) buf
;
367 /* Several chips lock up trying to read undefined config space */
368 if (capable(CAP_SYS_ADMIN
)) {
369 size
= dev
->cfg_size
;
370 } else if (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
) {
376 if (off
+ count
> size
) {
383 if ((off
& 1) && size
) {
385 pci_user_read_config_byte(dev
, off
, &val
);
386 data
[off
- init_off
] = val
;
391 if ((off
& 3) && size
> 2) {
393 pci_user_read_config_word(dev
, off
, &val
);
394 data
[off
- init_off
] = val
& 0xff;
395 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
402 pci_user_read_config_dword(dev
, off
, &val
);
403 data
[off
- init_off
] = val
& 0xff;
404 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
405 data
[off
- init_off
+ 2] = (val
>> 16) & 0xff;
406 data
[off
- init_off
+ 3] = (val
>> 24) & 0xff;
413 pci_user_read_config_word(dev
, off
, &val
);
414 data
[off
- init_off
] = val
& 0xff;
415 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
422 pci_user_read_config_byte(dev
, off
, &val
);
423 data
[off
- init_off
] = val
;
432 pci_write_config(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
433 char *buf
, loff_t off
, size_t count
)
435 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
,struct device
,kobj
));
436 unsigned int size
= count
;
437 loff_t init_off
= off
;
438 u8
*data
= (u8
*) buf
;
440 if (off
> dev
->cfg_size
)
442 if (off
+ count
> dev
->cfg_size
) {
443 size
= dev
->cfg_size
- off
;
447 if ((off
& 1) && size
) {
448 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
453 if ((off
& 3) && size
> 2) {
454 u16 val
= data
[off
- init_off
];
455 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
456 pci_user_write_config_word(dev
, off
, val
);
462 u32 val
= data
[off
- init_off
];
463 val
|= (u32
) data
[off
- init_off
+ 1] << 8;
464 val
|= (u32
) data
[off
- init_off
+ 2] << 16;
465 val
|= (u32
) data
[off
- init_off
+ 3] << 24;
466 pci_user_write_config_dword(dev
, off
, val
);
472 u16 val
= data
[off
- init_off
];
473 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
474 pci_user_write_config_word(dev
, off
, val
);
480 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
489 read_vpd_attr(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
490 char *buf
, loff_t off
, size_t count
)
492 struct pci_dev
*dev
=
493 to_pci_dev(container_of(kobj
, struct device
, kobj
));
495 if (off
> bin_attr
->size
)
497 else if (count
> bin_attr
->size
- off
)
498 count
= bin_attr
->size
- off
;
500 return pci_read_vpd(dev
, off
, count
, buf
);
504 write_vpd_attr(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
505 char *buf
, loff_t off
, size_t count
)
507 struct pci_dev
*dev
=
508 to_pci_dev(container_of(kobj
, struct device
, kobj
));
510 if (off
> bin_attr
->size
)
512 else if (count
> bin_attr
->size
- off
)
513 count
= bin_attr
->size
- off
;
515 return pci_write_vpd(dev
, off
, count
, buf
);
518 #ifdef HAVE_PCI_LEGACY
520 * pci_read_legacy_io - read byte(s) from legacy I/O port space
521 * @kobj: kobject corresponding to file to read from
522 * @bin_attr: struct bin_attribute for this file
523 * @buf: buffer to store results
524 * @off: offset into legacy I/O port space
525 * @count: number of bytes to read
527 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
528 * callback routine (pci_legacy_read).
531 pci_read_legacy_io(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
532 char *buf
, loff_t off
, size_t count
)
534 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
538 /* Only support 1, 2 or 4 byte accesses */
539 if (count
!= 1 && count
!= 2 && count
!= 4)
542 return pci_legacy_read(bus
, off
, (u32
*)buf
, count
);
546 * pci_write_legacy_io - write byte(s) to legacy I/O port space
547 * @kobj: kobject corresponding to file to read from
548 * @bin_attr: struct bin_attribute for this file
549 * @buf: buffer containing value to be written
550 * @off: offset into legacy I/O port space
551 * @count: number of bytes to write
553 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
554 * callback routine (pci_legacy_write).
557 pci_write_legacy_io(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
558 char *buf
, loff_t off
, size_t count
)
560 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
563 /* Only support 1, 2 or 4 byte accesses */
564 if (count
!= 1 && count
!= 2 && count
!= 4)
567 return pci_legacy_write(bus
, off
, *(u32
*)buf
, count
);
571 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
572 * @kobj: kobject corresponding to device to be mapped
573 * @attr: struct bin_attribute for this file
574 * @vma: struct vm_area_struct passed to mmap
576 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
577 * legacy memory space (first meg of bus space) into application virtual
581 pci_mmap_legacy_mem(struct kobject
*kobj
, struct bin_attribute
*attr
,
582 struct vm_area_struct
*vma
)
584 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
588 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_mem
);
592 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
593 * @kobj: kobject corresponding to device to be mapped
594 * @attr: struct bin_attribute for this file
595 * @vma: struct vm_area_struct passed to mmap
597 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
598 * legacy IO space (first meg of bus space) into application virtual
599 * memory space. Returns -ENOSYS if the operation isn't supported
602 pci_mmap_legacy_io(struct kobject
*kobj
, struct bin_attribute
*attr
,
603 struct vm_area_struct
*vma
)
605 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
609 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_io
);
613 * pci_adjust_legacy_attr - adjustment of legacy file attributes
614 * @b: bus to create files under
615 * @mmap_type: I/O port or memory
617 * Stub implementation. Can be overridden by arch if necessary.
620 pci_adjust_legacy_attr(struct pci_bus
*b
, enum pci_mmap_state mmap_type
)
626 * pci_create_legacy_files - create legacy I/O port and memory files
627 * @b: bus to create files under
629 * Some platforms allow access to legacy I/O port and ISA memory space on
630 * a per-bus basis. This routine creates the files and ties them into
631 * their associated read, write and mmap files from pci-sysfs.c
633 * On error unwind, but don't propogate the error to the caller
634 * as it is ok to set up the PCI bus without these files.
636 void pci_create_legacy_files(struct pci_bus
*b
)
640 b
->legacy_io
= kzalloc(sizeof(struct bin_attribute
) * 2,
645 b
->legacy_io
->attr
.name
= "legacy_io";
646 b
->legacy_io
->size
= 0xffff;
647 b
->legacy_io
->attr
.mode
= S_IRUSR
| S_IWUSR
;
648 b
->legacy_io
->read
= pci_read_legacy_io
;
649 b
->legacy_io
->write
= pci_write_legacy_io
;
650 b
->legacy_io
->mmap
= pci_mmap_legacy_io
;
651 pci_adjust_legacy_attr(b
, pci_mmap_io
);
652 error
= device_create_bin_file(&b
->dev
, b
->legacy_io
);
656 /* Allocated above after the legacy_io struct */
657 b
->legacy_mem
= b
->legacy_io
+ 1;
658 b
->legacy_mem
->attr
.name
= "legacy_mem";
659 b
->legacy_mem
->size
= 1024*1024;
660 b
->legacy_mem
->attr
.mode
= S_IRUSR
| S_IWUSR
;
661 b
->legacy_mem
->mmap
= pci_mmap_legacy_mem
;
662 pci_adjust_legacy_attr(b
, pci_mmap_mem
);
663 error
= device_create_bin_file(&b
->dev
, b
->legacy_mem
);
670 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
675 printk(KERN_WARNING
"pci: warning: could not create legacy I/O port "
676 "and ISA memory resources to sysfs\n");
680 void pci_remove_legacy_files(struct pci_bus
*b
)
683 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
684 device_remove_bin_file(&b
->dev
, b
->legacy_mem
);
685 kfree(b
->legacy_io
); /* both are allocated here */
688 #endif /* HAVE_PCI_LEGACY */
692 int pci_mmap_fits(struct pci_dev
*pdev
, int resno
, struct vm_area_struct
*vma
,
693 enum pci_mmap_api mmap_api
)
695 unsigned long nr
, start
, size
, pci_start
;
697 if (pci_resource_len(pdev
, resno
) == 0)
699 nr
= (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
700 start
= vma
->vm_pgoff
;
701 size
= ((pci_resource_len(pdev
, resno
) - 1) >> PAGE_SHIFT
) + 1;
702 pci_start
= (mmap_api
== PCI_MMAP_PROCFS
) ?
703 pci_resource_start(pdev
, resno
) >> PAGE_SHIFT
: 0;
704 if (start
>= pci_start
&& start
< pci_start
+ size
&&
705 start
+ nr
<= pci_start
+ size
)
711 * pci_mmap_resource - map a PCI resource into user memory space
712 * @kobj: kobject for mapping
713 * @attr: struct bin_attribute for the file being mapped
714 * @vma: struct vm_area_struct passed into the mmap
715 * @write_combine: 1 for write_combine mapping
717 * Use the regular PCI mapping routines to map a PCI resource into userspace.
720 pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
721 struct vm_area_struct
*vma
, int write_combine
)
723 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
724 struct device
, kobj
));
725 struct resource
*res
= (struct resource
*)attr
->private;
726 enum pci_mmap_state mmap_type
;
727 resource_size_t start
, end
;
730 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
731 if (res
== &pdev
->resource
[i
])
733 if (i
>= PCI_ROM_RESOURCE
)
736 if (!pci_mmap_fits(pdev
, i
, vma
, PCI_MMAP_SYSFS
)) {
737 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
738 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
739 current
->comm
, vma
->vm_end
-vma
->vm_start
, vma
->vm_pgoff
,
741 pci_resource_start(pdev
, i
), pci_resource_len(pdev
, i
));
745 /* pci_mmap_page_range() expects the same kind of entry as coming
746 * from /proc/bus/pci/ which is a "user visible" value. If this is
747 * different from the resource itself, arch will do necessary fixup.
749 pci_resource_to_user(pdev
, i
, res
, &start
, &end
);
750 vma
->vm_pgoff
+= start
>> PAGE_SHIFT
;
751 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
753 if (res
->flags
& IORESOURCE_MEM
&& iomem_is_exclusive(start
))
756 return pci_mmap_page_range(pdev
, vma
, mmap_type
, write_combine
);
760 pci_mmap_resource_uc(struct kobject
*kobj
, struct bin_attribute
*attr
,
761 struct vm_area_struct
*vma
)
763 return pci_mmap_resource(kobj
, attr
, vma
, 0);
767 pci_mmap_resource_wc(struct kobject
*kobj
, struct bin_attribute
*attr
,
768 struct vm_area_struct
*vma
)
770 return pci_mmap_resource(kobj
, attr
, vma
, 1);
774 * pci_remove_resource_files - cleanup resource files
775 * @pdev: dev to cleanup
777 * If we created resource files for @pdev, remove them from sysfs and
778 * free their resources.
781 pci_remove_resource_files(struct pci_dev
*pdev
)
785 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
786 struct bin_attribute
*res_attr
;
788 res_attr
= pdev
->res_attr
[i
];
790 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
794 res_attr
= pdev
->res_attr_wc
[i
];
796 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
802 static int pci_create_attr(struct pci_dev
*pdev
, int num
, int write_combine
)
804 /* allocate attribute structure, piggyback attribute name */
805 int name_len
= write_combine
? 13 : 10;
806 struct bin_attribute
*res_attr
;
809 res_attr
= kzalloc(sizeof(*res_attr
) + name_len
, GFP_ATOMIC
);
811 char *res_attr_name
= (char *)(res_attr
+ 1);
814 pdev
->res_attr_wc
[num
] = res_attr
;
815 sprintf(res_attr_name
, "resource%d_wc", num
);
816 res_attr
->mmap
= pci_mmap_resource_wc
;
818 pdev
->res_attr
[num
] = res_attr
;
819 sprintf(res_attr_name
, "resource%d", num
);
820 res_attr
->mmap
= pci_mmap_resource_uc
;
822 res_attr
->attr
.name
= res_attr_name
;
823 res_attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
824 res_attr
->size
= pci_resource_len(pdev
, num
);
825 res_attr
->private = &pdev
->resource
[num
];
826 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
834 * pci_create_resource_files - create resource files in sysfs for @dev
835 * @pdev: dev in question
837 * Walk the resources in @pdev creating files for each resource available.
839 static int pci_create_resource_files(struct pci_dev
*pdev
)
844 /* Expose the PCI resources from this device as files */
845 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
847 /* skip empty resources */
848 if (!pci_resource_len(pdev
, i
))
851 retval
= pci_create_attr(pdev
, i
, 0);
852 /* for prefetchable resources, create a WC mappable file */
853 if (!retval
&& pdev
->resource
[i
].flags
& IORESOURCE_PREFETCH
)
854 retval
= pci_create_attr(pdev
, i
, 1);
857 pci_remove_resource_files(pdev
);
863 #else /* !HAVE_PCI_MMAP */
864 int __weak
pci_create_resource_files(struct pci_dev
*dev
) { return 0; }
865 void __weak
pci_remove_resource_files(struct pci_dev
*dev
) { return; }
866 #endif /* HAVE_PCI_MMAP */
869 * pci_write_rom - used to enable access to the PCI ROM display
870 * @kobj: kernel object handle
871 * @bin_attr: struct bin_attribute for this file
874 * @count: number of byte in input
876 * writing anything except 0 enables it
879 pci_write_rom(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
880 char *buf
, loff_t off
, size_t count
)
882 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
884 if ((off
== 0) && (*buf
== '0') && (count
== 2))
885 pdev
->rom_attr_enabled
= 0;
887 pdev
->rom_attr_enabled
= 1;
893 * pci_read_rom - read a PCI ROM
894 * @kobj: kernel object handle
895 * @bin_attr: struct bin_attribute for this file
896 * @buf: where to put the data we read from the ROM
898 * @count: number of bytes to read
900 * Put @count bytes starting at @off into @buf from the ROM in the PCI
901 * device corresponding to @kobj.
904 pci_read_rom(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
905 char *buf
, loff_t off
, size_t count
)
907 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
911 if (!pdev
->rom_attr_enabled
)
914 rom
= pci_map_rom(pdev
, &size
); /* size starts out as PCI window size */
921 if (off
+ count
> size
)
924 memcpy_fromio(buf
, rom
+ off
, count
);
926 pci_unmap_rom(pdev
, rom
);
931 static struct bin_attribute pci_config_attr
= {
934 .mode
= S_IRUGO
| S_IWUSR
,
936 .size
= PCI_CFG_SPACE_SIZE
,
937 .read
= pci_read_config
,
938 .write
= pci_write_config
,
941 static struct bin_attribute pcie_config_attr
= {
944 .mode
= S_IRUGO
| S_IWUSR
,
946 .size
= PCI_CFG_SPACE_EXP_SIZE
,
947 .read
= pci_read_config
,
948 .write
= pci_write_config
,
951 int __attribute__ ((weak
)) pcibios_add_platform_entries(struct pci_dev
*dev
)
956 static ssize_t
reset_store(struct device
*dev
,
957 struct device_attribute
*attr
, const char *buf
,
960 struct pci_dev
*pdev
= to_pci_dev(dev
);
962 ssize_t result
= strict_strtoul(buf
, 0, &val
);
969 return pci_reset_function(pdev
);
972 static struct device_attribute reset_attr
= __ATTR(reset
, 0200, NULL
, reset_store
);
974 static int pci_create_capabilities_sysfs(struct pci_dev
*dev
)
977 struct bin_attribute
*attr
;
979 /* If the device has VPD, try to expose it in sysfs. */
981 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
985 attr
->size
= dev
->vpd
->len
;
986 attr
->attr
.name
= "vpd";
987 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
988 attr
->read
= read_vpd_attr
;
989 attr
->write
= write_vpd_attr
;
990 retval
= sysfs_create_bin_file(&dev
->dev
.kobj
, attr
);
995 dev
->vpd
->attr
= attr
;
998 /* Active State Power Management */
999 pcie_aspm_create_sysfs_dev_files(dev
);
1001 if (!pci_probe_reset_function(dev
)) {
1002 retval
= device_create_file(&dev
->dev
, &reset_attr
);
1010 pcie_aspm_remove_sysfs_dev_files(dev
);
1011 if (dev
->vpd
&& dev
->vpd
->attr
) {
1012 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1013 kfree(dev
->vpd
->attr
);
1019 int __must_check
pci_create_sysfs_dev_files (struct pci_dev
*pdev
)
1023 struct bin_attribute
*attr
;
1025 if (!sysfs_initialized
)
1028 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1029 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1031 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1035 retval
= pci_create_resource_files(pdev
);
1037 goto err_config_file
;
1039 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1040 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1041 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1044 /* If the device has a ROM, try to expose it in sysfs. */
1046 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1049 goto err_resource_files
;
1051 attr
->size
= rom_size
;
1052 attr
->attr
.name
= "rom";
1053 attr
->attr
.mode
= S_IRUSR
;
1054 attr
->read
= pci_read_rom
;
1055 attr
->write
= pci_write_rom
;
1056 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, attr
);
1059 goto err_resource_files
;
1061 pdev
->rom_attr
= attr
;
1064 if ((pdev
->class >> 8) == PCI_CLASS_DISPLAY_VGA
) {
1065 retval
= device_create_file(&pdev
->dev
, &vga_attr
);
1070 /* add platform-specific attributes */
1071 retval
= pcibios_add_platform_entries(pdev
);
1075 /* add sysfs entries for various capabilities */
1076 retval
= pci_create_capabilities_sysfs(pdev
);
1083 if ((pdev
->class >> 8) == PCI_CLASS_DISPLAY_VGA
)
1084 device_remove_file(&pdev
->dev
, &vga_attr
);
1087 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1088 kfree(pdev
->rom_attr
);
1089 pdev
->rom_attr
= NULL
;
1092 pci_remove_resource_files(pdev
);
1094 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1095 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1097 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1102 static void pci_remove_capabilities_sysfs(struct pci_dev
*dev
)
1104 if (dev
->vpd
&& dev
->vpd
->attr
) {
1105 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1106 kfree(dev
->vpd
->attr
);
1109 pcie_aspm_remove_sysfs_dev_files(dev
);
1110 if (dev
->reset_fn
) {
1111 device_remove_file(&dev
->dev
, &reset_attr
);
1117 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1118 * @pdev: device whose entries we should free
1120 * Cleanup when @pdev is removed from sysfs.
1122 void pci_remove_sysfs_dev_files(struct pci_dev
*pdev
)
1126 if (!sysfs_initialized
)
1129 pci_remove_capabilities_sysfs(pdev
);
1131 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1132 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1134 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1136 pci_remove_resource_files(pdev
);
1138 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1139 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1140 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1143 if (rom_size
&& pdev
->rom_attr
) {
1144 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1145 kfree(pdev
->rom_attr
);
1149 static int __init
pci_sysfs_init(void)
1151 struct pci_dev
*pdev
= NULL
;
1154 sysfs_initialized
= 1;
1155 for_each_pci_dev(pdev
) {
1156 retval
= pci_create_sysfs_dev_files(pdev
);
1166 late_initcall(pci_sysfs_init
);