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
;
77 mask
= cpumask_of_pcibus(to_pci_dev(dev
)->bus
);
78 len
= cpumask_scnprintf(buf
, PAGE_SIZE
-2, mask
);
85 static ssize_t
local_cpulist_show(struct device
*dev
,
86 struct device_attribute
*attr
, char *buf
)
88 const struct cpumask
*mask
;
91 mask
= cpumask_of_pcibus(to_pci_dev(dev
)->bus
);
92 len
= cpulist_scnprintf(buf
, PAGE_SIZE
-2, mask
);
100 resource_show(struct device
* dev
, struct device_attribute
*attr
, char * buf
)
102 struct pci_dev
* pci_dev
= to_pci_dev(dev
);
106 resource_size_t start
, end
;
108 if (pci_dev
->subordinate
)
109 max
= DEVICE_COUNT_RESOURCE
;
111 max
= PCI_BRIDGE_RESOURCES
;
113 for (i
= 0; i
< max
; i
++) {
114 struct resource
*res
= &pci_dev
->resource
[i
];
115 pci_resource_to_user(pci_dev
, i
, res
, &start
, &end
);
116 str
+= sprintf(str
,"0x%016llx 0x%016llx 0x%016llx\n",
117 (unsigned long long)start
,
118 (unsigned long long)end
,
119 (unsigned long long)res
->flags
);
124 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
126 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
128 return sprintf(buf
, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
129 pci_dev
->vendor
, pci_dev
->device
,
130 pci_dev
->subsystem_vendor
, pci_dev
->subsystem_device
,
131 (u8
)(pci_dev
->class >> 16), (u8
)(pci_dev
->class >> 8),
132 (u8
)(pci_dev
->class));
135 static ssize_t
is_enabled_store(struct device
*dev
,
136 struct device_attribute
*attr
, const char *buf
,
139 struct pci_dev
*pdev
= to_pci_dev(dev
);
141 ssize_t result
= strict_strtoul(buf
, 0, &val
);
146 /* this can crash the machine when done on the "wrong" device */
147 if (!capable(CAP_SYS_ADMIN
))
151 if (atomic_read(&pdev
->enable_cnt
) != 0)
152 pci_disable_device(pdev
);
156 result
= pci_enable_device(pdev
);
158 return result
< 0 ? result
: count
;
161 static ssize_t
is_enabled_show(struct device
*dev
,
162 struct device_attribute
*attr
, char *buf
)
164 struct pci_dev
*pdev
;
166 pdev
= to_pci_dev (dev
);
167 return sprintf (buf
, "%u\n", atomic_read(&pdev
->enable_cnt
));
172 numa_node_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
174 return sprintf (buf
, "%d\n", dev
->numa_node
);
179 msi_bus_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
181 struct pci_dev
*pdev
= to_pci_dev(dev
);
183 if (!pdev
->subordinate
)
186 return sprintf (buf
, "%u\n",
187 !(pdev
->subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
));
191 msi_bus_store(struct device
*dev
, struct device_attribute
*attr
,
192 const char *buf
, size_t count
)
194 struct pci_dev
*pdev
= to_pci_dev(dev
);
197 if (strict_strtoul(buf
, 0, &val
) < 0)
200 /* bad things may happen if the no_msi flag is changed
201 * while some drivers are loaded */
202 if (!capable(CAP_SYS_ADMIN
))
205 /* Maybe pci devices without subordinate busses shouldn't even have this
206 * attribute in the first place? */
207 if (!pdev
->subordinate
)
210 /* Is the flag going to change, or keep the value it already had? */
211 if (!(pdev
->subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
) ^
213 pdev
->subordinate
->bus_flags
^= PCI_BUS_FLAGS_NO_MSI
;
215 dev_warn(&pdev
->dev
, "forced subordinate bus to%s support MSI,"
216 " bad things could happen\n", val
? "" : " not");
222 #ifdef CONFIG_HOTPLUG
223 static DEFINE_MUTEX(pci_remove_rescan_mutex
);
224 static ssize_t
bus_rescan_store(struct bus_type
*bus
, const char *buf
,
228 struct pci_bus
*b
= NULL
;
230 if (strict_strtoul(buf
, 0, &val
) < 0)
234 mutex_lock(&pci_remove_rescan_mutex
);
235 while ((b
= pci_find_next_bus(b
)) != NULL
)
237 mutex_unlock(&pci_remove_rescan_mutex
);
242 struct bus_attribute pci_bus_attrs
[] = {
243 __ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, bus_rescan_store
),
247 static void remove_callback(struct device
*dev
)
249 struct pci_dev
*pdev
= to_pci_dev(dev
);
251 mutex_lock(&pci_remove_rescan_mutex
);
252 pci_remove_bus_device(pdev
);
253 mutex_unlock(&pci_remove_rescan_mutex
);
257 remove_store(struct device
*dev
, struct device_attribute
*dummy
,
258 const char *buf
, size_t count
)
262 struct pci_dev
*pdev
= to_pci_dev(dev
);
264 if (strict_strtoul(buf
, 0, &val
) < 0)
267 if (pci_is_root_bus(pdev
->bus
))
270 /* An attribute cannot be unregistered by one of its own methods,
271 * so we have to use this roundabout approach.
274 ret
= device_schedule_callback(dev
, remove_callback
);
281 struct device_attribute pci_dev_attrs
[] = {
285 __ATTR_RO(subsystem_vendor
),
286 __ATTR_RO(subsystem_device
),
289 __ATTR_RO(local_cpus
),
290 __ATTR_RO(local_cpulist
),
293 __ATTR_RO(numa_node
),
295 __ATTR(enable
, 0600, is_enabled_show
, is_enabled_store
),
296 __ATTR(broken_parity_status
,(S_IRUGO
|S_IWUSR
),
297 broken_parity_status_show
,broken_parity_status_store
),
298 __ATTR(msi_bus
, 0644, msi_bus_show
, msi_bus_store
),
299 #ifdef CONFIG_HOTPLUG
300 __ATTR(remove
, (S_IWUSR
|S_IWGRP
), NULL
, remove_store
),
306 boot_vga_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
308 struct pci_dev
*pdev
= to_pci_dev(dev
);
310 return sprintf(buf
, "%u\n",
311 !!(pdev
->resource
[PCI_ROM_RESOURCE
].flags
&
312 IORESOURCE_ROM_SHADOW
));
314 struct device_attribute vga_attr
= __ATTR_RO(boot_vga
);
317 pci_read_config(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
318 char *buf
, loff_t off
, size_t count
)
320 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
,struct device
,kobj
));
321 unsigned int size
= 64;
322 loff_t init_off
= off
;
323 u8
*data
= (u8
*) buf
;
325 /* Several chips lock up trying to read undefined config space */
326 if (capable(CAP_SYS_ADMIN
)) {
327 size
= dev
->cfg_size
;
328 } else if (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
) {
334 if (off
+ count
> size
) {
341 if ((off
& 1) && size
) {
343 pci_user_read_config_byte(dev
, off
, &val
);
344 data
[off
- init_off
] = val
;
349 if ((off
& 3) && size
> 2) {
351 pci_user_read_config_word(dev
, off
, &val
);
352 data
[off
- init_off
] = val
& 0xff;
353 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
360 pci_user_read_config_dword(dev
, off
, &val
);
361 data
[off
- init_off
] = val
& 0xff;
362 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
363 data
[off
- init_off
+ 2] = (val
>> 16) & 0xff;
364 data
[off
- init_off
+ 3] = (val
>> 24) & 0xff;
371 pci_user_read_config_word(dev
, off
, &val
);
372 data
[off
- init_off
] = val
& 0xff;
373 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
380 pci_user_read_config_byte(dev
, off
, &val
);
381 data
[off
- init_off
] = val
;
390 pci_write_config(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
391 char *buf
, loff_t off
, size_t count
)
393 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
,struct device
,kobj
));
394 unsigned int size
= count
;
395 loff_t init_off
= off
;
396 u8
*data
= (u8
*) buf
;
398 if (off
> dev
->cfg_size
)
400 if (off
+ count
> dev
->cfg_size
) {
401 size
= dev
->cfg_size
- off
;
405 if ((off
& 1) && size
) {
406 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
411 if ((off
& 3) && size
> 2) {
412 u16 val
= data
[off
- init_off
];
413 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
414 pci_user_write_config_word(dev
, off
, val
);
420 u32 val
= data
[off
- init_off
];
421 val
|= (u32
) data
[off
- init_off
+ 1] << 8;
422 val
|= (u32
) data
[off
- init_off
+ 2] << 16;
423 val
|= (u32
) data
[off
- init_off
+ 3] << 24;
424 pci_user_write_config_dword(dev
, off
, val
);
430 u16 val
= data
[off
- init_off
];
431 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
432 pci_user_write_config_word(dev
, off
, val
);
438 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
447 read_vpd_attr(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
448 char *buf
, loff_t off
, size_t count
)
450 struct pci_dev
*dev
=
451 to_pci_dev(container_of(kobj
, struct device
, kobj
));
453 if (off
> bin_attr
->size
)
455 else if (count
> bin_attr
->size
- off
)
456 count
= bin_attr
->size
- off
;
458 return pci_read_vpd(dev
, off
, count
, buf
);
462 write_vpd_attr(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
463 char *buf
, loff_t off
, size_t count
)
465 struct pci_dev
*dev
=
466 to_pci_dev(container_of(kobj
, struct device
, kobj
));
468 if (off
> bin_attr
->size
)
470 else if (count
> bin_attr
->size
- off
)
471 count
= bin_attr
->size
- off
;
473 return pci_write_vpd(dev
, off
, count
, buf
);
476 #ifdef HAVE_PCI_LEGACY
478 * pci_read_legacy_io - read byte(s) from legacy I/O port space
479 * @kobj: kobject corresponding to file to read from
480 * @buf: buffer to store results
481 * @off: offset into legacy I/O port space
482 * @count: number of bytes to read
484 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
485 * callback routine (pci_legacy_read).
488 pci_read_legacy_io(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
489 char *buf
, loff_t off
, size_t count
)
491 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
495 /* Only support 1, 2 or 4 byte accesses */
496 if (count
!= 1 && count
!= 2 && count
!= 4)
499 return pci_legacy_read(bus
, off
, (u32
*)buf
, count
);
503 * pci_write_legacy_io - write byte(s) to legacy I/O port space
504 * @kobj: kobject corresponding to file to read from
505 * @buf: buffer containing value to be written
506 * @off: offset into legacy I/O port space
507 * @count: number of bytes to write
509 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
510 * callback routine (pci_legacy_write).
513 pci_write_legacy_io(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
514 char *buf
, loff_t off
, size_t count
)
516 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
519 /* Only support 1, 2 or 4 byte accesses */
520 if (count
!= 1 && count
!= 2 && count
!= 4)
523 return pci_legacy_write(bus
, off
, *(u32
*)buf
, count
);
527 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
528 * @kobj: kobject corresponding to device to be mapped
529 * @attr: struct bin_attribute for this file
530 * @vma: struct vm_area_struct passed to mmap
532 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
533 * legacy memory space (first meg of bus space) into application virtual
537 pci_mmap_legacy_mem(struct kobject
*kobj
, struct bin_attribute
*attr
,
538 struct vm_area_struct
*vma
)
540 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
544 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_mem
);
548 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
549 * @kobj: kobject corresponding to device to be mapped
550 * @attr: struct bin_attribute for this file
551 * @vma: struct vm_area_struct passed to mmap
553 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
554 * legacy IO space (first meg of bus space) into application virtual
555 * memory space. Returns -ENOSYS if the operation isn't supported
558 pci_mmap_legacy_io(struct kobject
*kobj
, struct bin_attribute
*attr
,
559 struct vm_area_struct
*vma
)
561 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
565 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_io
);
569 * pci_adjust_legacy_attr - adjustment of legacy file attributes
570 * @b: bus to create files under
571 * @mmap_type: I/O port or memory
573 * Stub implementation. Can be overridden by arch if necessary.
576 pci_adjust_legacy_attr(struct pci_bus
*b
, enum pci_mmap_state mmap_type
)
582 * pci_create_legacy_files - create legacy I/O port and memory files
583 * @b: bus to create files under
585 * Some platforms allow access to legacy I/O port and ISA memory space on
586 * a per-bus basis. This routine creates the files and ties them into
587 * their associated read, write and mmap files from pci-sysfs.c
589 * On error unwind, but don't propogate the error to the caller
590 * as it is ok to set up the PCI bus without these files.
592 void pci_create_legacy_files(struct pci_bus
*b
)
596 b
->legacy_io
= kzalloc(sizeof(struct bin_attribute
) * 2,
601 b
->legacy_io
->attr
.name
= "legacy_io";
602 b
->legacy_io
->size
= 0xffff;
603 b
->legacy_io
->attr
.mode
= S_IRUSR
| S_IWUSR
;
604 b
->legacy_io
->read
= pci_read_legacy_io
;
605 b
->legacy_io
->write
= pci_write_legacy_io
;
606 b
->legacy_io
->mmap
= pci_mmap_legacy_io
;
607 pci_adjust_legacy_attr(b
, pci_mmap_io
);
608 error
= device_create_bin_file(&b
->dev
, b
->legacy_io
);
612 /* Allocated above after the legacy_io struct */
613 b
->legacy_mem
= b
->legacy_io
+ 1;
614 b
->legacy_mem
->attr
.name
= "legacy_mem";
615 b
->legacy_mem
->size
= 1024*1024;
616 b
->legacy_mem
->attr
.mode
= S_IRUSR
| S_IWUSR
;
617 b
->legacy_mem
->mmap
= pci_mmap_legacy_mem
;
618 pci_adjust_legacy_attr(b
, pci_mmap_mem
);
619 error
= device_create_bin_file(&b
->dev
, b
->legacy_mem
);
626 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
631 printk(KERN_WARNING
"pci: warning: could not create legacy I/O port "
632 "and ISA memory resources to sysfs\n");
636 void pci_remove_legacy_files(struct pci_bus
*b
)
639 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
640 device_remove_bin_file(&b
->dev
, b
->legacy_mem
);
641 kfree(b
->legacy_io
); /* both are allocated here */
644 #endif /* HAVE_PCI_LEGACY */
648 int pci_mmap_fits(struct pci_dev
*pdev
, int resno
, struct vm_area_struct
*vma
)
650 unsigned long nr
, start
, size
;
652 nr
= (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
653 start
= vma
->vm_pgoff
;
654 size
= ((pci_resource_len(pdev
, resno
) - 1) >> PAGE_SHIFT
) + 1;
655 if (start
< size
&& size
- start
>= nr
)
657 WARN(1, "process \"%s\" tried to map 0x%08lx-0x%08lx on %s BAR %d (size 0x%08lx)\n",
658 current
->comm
, start
, start
+nr
, pci_name(pdev
), resno
, size
);
663 * pci_mmap_resource - map a PCI resource into user memory space
664 * @kobj: kobject for mapping
665 * @attr: struct bin_attribute for the file being mapped
666 * @vma: struct vm_area_struct passed into the mmap
667 * @write_combine: 1 for write_combine mapping
669 * Use the regular PCI mapping routines to map a PCI resource into userspace.
672 pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
673 struct vm_area_struct
*vma
, int write_combine
)
675 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
676 struct device
, kobj
));
677 struct resource
*res
= (struct resource
*)attr
->private;
678 enum pci_mmap_state mmap_type
;
679 resource_size_t start
, end
;
682 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
683 if (res
== &pdev
->resource
[i
])
685 if (i
>= PCI_ROM_RESOURCE
)
688 if (!pci_mmap_fits(pdev
, i
, vma
))
691 /* pci_mmap_page_range() expects the same kind of entry as coming
692 * from /proc/bus/pci/ which is a "user visible" value. If this is
693 * different from the resource itself, arch will do necessary fixup.
695 pci_resource_to_user(pdev
, i
, res
, &start
, &end
);
696 vma
->vm_pgoff
+= start
>> PAGE_SHIFT
;
697 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
699 if (res
->flags
& IORESOURCE_MEM
&& iomem_is_exclusive(start
))
702 return pci_mmap_page_range(pdev
, vma
, mmap_type
, write_combine
);
706 pci_mmap_resource_uc(struct kobject
*kobj
, struct bin_attribute
*attr
,
707 struct vm_area_struct
*vma
)
709 return pci_mmap_resource(kobj
, attr
, vma
, 0);
713 pci_mmap_resource_wc(struct kobject
*kobj
, struct bin_attribute
*attr
,
714 struct vm_area_struct
*vma
)
716 return pci_mmap_resource(kobj
, attr
, vma
, 1);
720 * pci_remove_resource_files - cleanup resource files
721 * @dev: dev to cleanup
723 * If we created resource files for @dev, remove them from sysfs and
724 * free their resources.
727 pci_remove_resource_files(struct pci_dev
*pdev
)
731 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
732 struct bin_attribute
*res_attr
;
734 res_attr
= pdev
->res_attr
[i
];
736 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
740 res_attr
= pdev
->res_attr_wc
[i
];
742 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
748 static int pci_create_attr(struct pci_dev
*pdev
, int num
, int write_combine
)
750 /* allocate attribute structure, piggyback attribute name */
751 int name_len
= write_combine
? 13 : 10;
752 struct bin_attribute
*res_attr
;
755 res_attr
= kzalloc(sizeof(*res_attr
) + name_len
, GFP_ATOMIC
);
757 char *res_attr_name
= (char *)(res_attr
+ 1);
760 pdev
->res_attr_wc
[num
] = res_attr
;
761 sprintf(res_attr_name
, "resource%d_wc", num
);
762 res_attr
->mmap
= pci_mmap_resource_wc
;
764 pdev
->res_attr
[num
] = res_attr
;
765 sprintf(res_attr_name
, "resource%d", num
);
766 res_attr
->mmap
= pci_mmap_resource_uc
;
768 res_attr
->attr
.name
= res_attr_name
;
769 res_attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
770 res_attr
->size
= pci_resource_len(pdev
, num
);
771 res_attr
->private = &pdev
->resource
[num
];
772 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
780 * pci_create_resource_files - create resource files in sysfs for @dev
781 * @dev: dev in question
783 * Walk the resources in @dev creating files for each resource available.
785 static int pci_create_resource_files(struct pci_dev
*pdev
)
790 /* Expose the PCI resources from this device as files */
791 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
793 /* skip empty resources */
794 if (!pci_resource_len(pdev
, i
))
797 retval
= pci_create_attr(pdev
, i
, 0);
798 /* for prefetchable resources, create a WC mappable file */
799 if (!retval
&& pdev
->resource
[i
].flags
& IORESOURCE_PREFETCH
)
800 retval
= pci_create_attr(pdev
, i
, 1);
803 pci_remove_resource_files(pdev
);
809 #else /* !HAVE_PCI_MMAP */
810 int __weak
pci_create_resource_files(struct pci_dev
*dev
) { return 0; }
811 void __weak
pci_remove_resource_files(struct pci_dev
*dev
) { return; }
812 #endif /* HAVE_PCI_MMAP */
815 * pci_write_rom - used to enable access to the PCI ROM display
816 * @kobj: kernel object handle
819 * @count: number of byte in input
821 * writing anything except 0 enables it
824 pci_write_rom(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
825 char *buf
, loff_t off
, size_t count
)
827 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
829 if ((off
== 0) && (*buf
== '0') && (count
== 2))
830 pdev
->rom_attr_enabled
= 0;
832 pdev
->rom_attr_enabled
= 1;
838 * pci_read_rom - read a PCI ROM
839 * @kobj: kernel object handle
840 * @buf: where to put the data we read from the ROM
842 * @count: number of bytes to read
844 * Put @count bytes starting at @off into @buf from the ROM in the PCI
845 * device corresponding to @kobj.
848 pci_read_rom(struct kobject
*kobj
, struct bin_attribute
*bin_attr
,
849 char *buf
, loff_t off
, size_t count
)
851 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
855 if (!pdev
->rom_attr_enabled
)
858 rom
= pci_map_rom(pdev
, &size
); /* size starts out as PCI window size */
865 if (off
+ count
> size
)
868 memcpy_fromio(buf
, rom
+ off
, count
);
870 pci_unmap_rom(pdev
, rom
);
875 static struct bin_attribute pci_config_attr
= {
878 .mode
= S_IRUGO
| S_IWUSR
,
880 .size
= PCI_CFG_SPACE_SIZE
,
881 .read
= pci_read_config
,
882 .write
= pci_write_config
,
885 static struct bin_attribute pcie_config_attr
= {
888 .mode
= S_IRUGO
| S_IWUSR
,
890 .size
= PCI_CFG_SPACE_EXP_SIZE
,
891 .read
= pci_read_config
,
892 .write
= pci_write_config
,
895 int __attribute__ ((weak
)) pcibios_add_platform_entries(struct pci_dev
*dev
)
900 static int pci_create_capabilities_sysfs(struct pci_dev
*dev
)
903 struct bin_attribute
*attr
;
905 /* If the device has VPD, try to expose it in sysfs. */
907 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
911 attr
->size
= dev
->vpd
->len
;
912 attr
->attr
.name
= "vpd";
913 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
914 attr
->read
= read_vpd_attr
;
915 attr
->write
= write_vpd_attr
;
916 retval
= sysfs_create_bin_file(&dev
->dev
.kobj
, attr
);
918 kfree(dev
->vpd
->attr
);
921 dev
->vpd
->attr
= attr
;
924 /* Active State Power Management */
925 pcie_aspm_create_sysfs_dev_files(dev
);
930 int __must_check
pci_create_sysfs_dev_files (struct pci_dev
*pdev
)
934 struct bin_attribute
*attr
;
936 if (!sysfs_initialized
)
939 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
940 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
942 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
946 retval
= pci_create_resource_files(pdev
);
948 goto err_config_file
;
950 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
951 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
952 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
955 /* If the device has a ROM, try to expose it in sysfs. */
957 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
960 goto err_resource_files
;
962 attr
->size
= rom_size
;
963 attr
->attr
.name
= "rom";
964 attr
->attr
.mode
= S_IRUSR
;
965 attr
->read
= pci_read_rom
;
966 attr
->write
= pci_write_rom
;
967 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, attr
);
970 goto err_resource_files
;
972 pdev
->rom_attr
= attr
;
975 if ((pdev
->class >> 8) == PCI_CLASS_DISPLAY_VGA
) {
976 retval
= device_create_file(&pdev
->dev
, &vga_attr
);
981 /* add platform-specific attributes */
982 retval
= pcibios_add_platform_entries(pdev
);
986 /* add sysfs entries for various capabilities */
987 retval
= pci_create_capabilities_sysfs(pdev
);
994 if ((pdev
->class >> 8) == PCI_CLASS_DISPLAY_VGA
)
995 device_remove_file(&pdev
->dev
, &vga_attr
);
998 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
999 kfree(pdev
->rom_attr
);
1000 pdev
->rom_attr
= NULL
;
1003 pci_remove_resource_files(pdev
);
1005 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1006 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1008 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1013 static void pci_remove_capabilities_sysfs(struct pci_dev
*dev
)
1015 if (dev
->vpd
&& dev
->vpd
->attr
) {
1016 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1017 kfree(dev
->vpd
->attr
);
1020 pcie_aspm_remove_sysfs_dev_files(dev
);
1024 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1025 * @pdev: device whose entries we should free
1027 * Cleanup when @pdev is removed from sysfs.
1029 void pci_remove_sysfs_dev_files(struct pci_dev
*pdev
)
1033 if (!sysfs_initialized
)
1036 pci_remove_capabilities_sysfs(pdev
);
1038 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1039 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1041 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1043 pci_remove_resource_files(pdev
);
1045 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1046 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1047 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1050 if (rom_size
&& pdev
->rom_attr
) {
1051 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1052 kfree(pdev
->rom_attr
);
1056 static int __init
pci_sysfs_init(void)
1058 struct pci_dev
*pdev
= NULL
;
1061 sysfs_initialized
= 1;
1062 for_each_pci_dev(pdev
) {
1063 retval
= pci_create_sysfs_dev_files(pdev
);
1073 late_initcall(pci_sysfs_init
);