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>
33 static int sysfs_initialized
; /* = 0 */
35 /* show configuration fields */
36 #define pci_config_attr(field, format_string) \
38 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
40 struct pci_dev *pdev; \
42 pdev = to_pci_dev (dev); \
43 return sprintf (buf, format_string, pdev->field); \
46 pci_config_attr(vendor
, "0x%04x\n");
47 pci_config_attr(device
, "0x%04x\n");
48 pci_config_attr(subsystem_vendor
, "0x%04x\n");
49 pci_config_attr(subsystem_device
, "0x%04x\n");
50 pci_config_attr(class, "0x%06x\n");
51 pci_config_attr(irq
, "%u\n");
53 static ssize_t
broken_parity_status_show(struct device
*dev
,
54 struct device_attribute
*attr
,
57 struct pci_dev
*pdev
= to_pci_dev(dev
);
58 return sprintf (buf
, "%u\n", pdev
->broken_parity_status
);
61 static ssize_t
broken_parity_status_store(struct device
*dev
,
62 struct device_attribute
*attr
,
63 const char *buf
, size_t count
)
65 struct pci_dev
*pdev
= to_pci_dev(dev
);
68 if (strict_strtoul(buf
, 0, &val
) < 0)
71 pdev
->broken_parity_status
= !!val
;
76 static ssize_t
local_cpus_show(struct device
*dev
,
77 struct device_attribute
*attr
, char *buf
)
79 const struct cpumask
*mask
;
83 mask
= (dev_to_node(dev
) == -1) ? cpu_online_mask
:
84 cpumask_of_node(dev_to_node(dev
));
86 mask
= cpumask_of_pcibus(to_pci_dev(dev
)->bus
);
88 len
= cpumask_scnprintf(buf
, PAGE_SIZE
-2, mask
);
95 static ssize_t
local_cpulist_show(struct device
*dev
,
96 struct device_attribute
*attr
, char *buf
)
98 const struct cpumask
*mask
;
102 mask
= (dev_to_node(dev
) == -1) ? cpu_online_mask
:
103 cpumask_of_node(dev_to_node(dev
));
105 mask
= cpumask_of_pcibus(to_pci_dev(dev
)->bus
);
107 len
= cpulist_scnprintf(buf
, PAGE_SIZE
-2, mask
);
114 * PCI Bus Class Devices
116 static ssize_t
pci_bus_show_cpuaffinity(struct device
*dev
,
118 struct device_attribute
*attr
,
122 const struct cpumask
*cpumask
;
124 cpumask
= cpumask_of_pcibus(to_pci_bus(dev
));
126 cpulist_scnprintf(buf
, PAGE_SIZE
-2, cpumask
) :
127 cpumask_scnprintf(buf
, PAGE_SIZE
-2, cpumask
);
133 static inline ssize_t
pci_bus_show_cpumaskaffinity(struct device
*dev
,
134 struct device_attribute
*attr
,
137 return pci_bus_show_cpuaffinity(dev
, 0, attr
, buf
);
140 static inline ssize_t
pci_bus_show_cpulistaffinity(struct device
*dev
,
141 struct device_attribute
*attr
,
144 return pci_bus_show_cpuaffinity(dev
, 1, attr
, buf
);
149 resource_show(struct device
* dev
, struct device_attribute
*attr
, char * buf
)
151 struct pci_dev
* pci_dev
= to_pci_dev(dev
);
155 resource_size_t start
, end
;
157 if (pci_dev
->subordinate
)
158 max
= DEVICE_COUNT_RESOURCE
;
160 max
= PCI_BRIDGE_RESOURCES
;
162 for (i
= 0; i
< max
; i
++) {
163 struct resource
*res
= &pci_dev
->resource
[i
];
164 pci_resource_to_user(pci_dev
, i
, res
, &start
, &end
);
165 str
+= sprintf(str
,"0x%016llx 0x%016llx 0x%016llx\n",
166 (unsigned long long)start
,
167 (unsigned long long)end
,
168 (unsigned long long)res
->flags
);
173 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
175 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
177 return sprintf(buf
, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
178 pci_dev
->vendor
, pci_dev
->device
,
179 pci_dev
->subsystem_vendor
, pci_dev
->subsystem_device
,
180 (u8
)(pci_dev
->class >> 16), (u8
)(pci_dev
->class >> 8),
181 (u8
)(pci_dev
->class));
184 static ssize_t
is_enabled_store(struct device
*dev
,
185 struct device_attribute
*attr
, const char *buf
,
188 struct pci_dev
*pdev
= to_pci_dev(dev
);
190 ssize_t result
= strict_strtoul(buf
, 0, &val
);
195 /* this can crash the machine when done on the "wrong" device */
196 if (!capable(CAP_SYS_ADMIN
))
200 if (pci_is_enabled(pdev
))
201 pci_disable_device(pdev
);
205 result
= pci_enable_device(pdev
);
207 return result
< 0 ? result
: count
;
210 static ssize_t
is_enabled_show(struct device
*dev
,
211 struct device_attribute
*attr
, char *buf
)
213 struct pci_dev
*pdev
;
215 pdev
= to_pci_dev (dev
);
216 return sprintf (buf
, "%u\n", atomic_read(&pdev
->enable_cnt
));
221 numa_node_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
223 return sprintf (buf
, "%d\n", dev
->numa_node
);
228 dma_mask_bits_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
230 struct pci_dev
*pdev
= to_pci_dev(dev
);
232 return sprintf (buf
, "%d\n", fls64(pdev
->dma_mask
));
236 consistent_dma_mask_bits_show(struct device
*dev
, struct device_attribute
*attr
,
239 return sprintf (buf
, "%d\n", fls64(dev
->coherent_dma_mask
));
243 msi_bus_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
245 struct pci_dev
*pdev
= to_pci_dev(dev
);
247 if (!pdev
->subordinate
)
250 return sprintf (buf
, "%u\n",
251 !(pdev
->subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
));
255 msi_bus_store(struct device
*dev
, struct device_attribute
*attr
,
256 const char *buf
, size_t count
)
258 struct pci_dev
*pdev
= to_pci_dev(dev
);
261 if (strict_strtoul(buf
, 0, &val
) < 0)
264 /* bad things may happen if the no_msi flag is changed
265 * while some drivers are loaded */
266 if (!capable(CAP_SYS_ADMIN
))
269 /* Maybe pci devices without subordinate busses shouldn't even have this
270 * attribute in the first place? */
271 if (!pdev
->subordinate
)
274 /* Is the flag going to change, or keep the value it already had? */
275 if (!(pdev
->subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
) ^
277 pdev
->subordinate
->bus_flags
^= PCI_BUS_FLAGS_NO_MSI
;
279 dev_warn(&pdev
->dev
, "forced subordinate bus to%s support MSI,"
280 " bad things could happen\n", val
? "" : " not");
286 #ifdef CONFIG_HOTPLUG
287 static DEFINE_MUTEX(pci_remove_rescan_mutex
);
288 static ssize_t
bus_rescan_store(struct bus_type
*bus
, const char *buf
,
292 struct pci_bus
*b
= NULL
;
294 if (strict_strtoul(buf
, 0, &val
) < 0)
298 mutex_lock(&pci_remove_rescan_mutex
);
299 while ((b
= pci_find_next_bus(b
)) != NULL
)
301 mutex_unlock(&pci_remove_rescan_mutex
);
306 struct bus_attribute pci_bus_attrs
[] = {
307 __ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, bus_rescan_store
),
312 dev_rescan_store(struct device
*dev
, struct device_attribute
*attr
,
313 const char *buf
, size_t count
)
316 struct pci_dev
*pdev
= to_pci_dev(dev
);
318 if (strict_strtoul(buf
, 0, &val
) < 0)
322 mutex_lock(&pci_remove_rescan_mutex
);
323 pci_rescan_bus(pdev
->bus
);
324 mutex_unlock(&pci_remove_rescan_mutex
);
329 static void remove_callback(struct device
*dev
)
331 struct pci_dev
*pdev
= to_pci_dev(dev
);
333 mutex_lock(&pci_remove_rescan_mutex
);
334 pci_stop_and_remove_bus_device(pdev
);
335 mutex_unlock(&pci_remove_rescan_mutex
);
339 remove_store(struct device
*dev
, struct device_attribute
*dummy
,
340 const char *buf
, size_t count
)
345 if (strict_strtoul(buf
, 0, &val
) < 0)
348 /* An attribute cannot be unregistered by one of its own methods,
349 * so we have to use this roundabout approach.
352 ret
= device_schedule_callback(dev
, remove_callback
);
359 dev_bus_rescan_store(struct device
*dev
, struct device_attribute
*attr
,
360 const char *buf
, size_t count
)
363 struct pci_bus
*bus
= to_pci_bus(dev
);
365 if (strict_strtoul(buf
, 0, &val
) < 0)
369 mutex_lock(&pci_remove_rescan_mutex
);
370 if (!pci_is_root_bus(bus
) && list_empty(&bus
->devices
))
371 pci_rescan_bus_bridge_resize(bus
->self
);
374 mutex_unlock(&pci_remove_rescan_mutex
);
381 struct device_attribute pci_dev_attrs
[] = {
385 __ATTR_RO(subsystem_vendor
),
386 __ATTR_RO(subsystem_device
),
389 __ATTR_RO(local_cpus
),
390 __ATTR_RO(local_cpulist
),
393 __ATTR_RO(numa_node
),
395 __ATTR_RO(dma_mask_bits
),
396 __ATTR_RO(consistent_dma_mask_bits
),
397 __ATTR(enable
, 0600, is_enabled_show
, is_enabled_store
),
398 __ATTR(broken_parity_status
,(S_IRUGO
|S_IWUSR
),
399 broken_parity_status_show
,broken_parity_status_store
),
400 __ATTR(msi_bus
, 0644, msi_bus_show
, msi_bus_store
),
401 #ifdef CONFIG_HOTPLUG
402 __ATTR(remove
, (S_IWUSR
|S_IWGRP
), NULL
, remove_store
),
403 __ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, dev_rescan_store
),
408 struct device_attribute pcibus_dev_attrs
[] = {
409 #ifdef CONFIG_HOTPLUG
410 __ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, dev_bus_rescan_store
),
412 __ATTR(cpuaffinity
, S_IRUGO
, pci_bus_show_cpumaskaffinity
, NULL
),
413 __ATTR(cpulistaffinity
, S_IRUGO
, pci_bus_show_cpulistaffinity
, NULL
),
418 boot_vga_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
420 struct pci_dev
*pdev
= to_pci_dev(dev
);
421 struct pci_dev
*vga_dev
= vga_default_device();
424 return sprintf(buf
, "%u\n", (pdev
== vga_dev
));
426 return sprintf(buf
, "%u\n",
427 !!(pdev
->resource
[PCI_ROM_RESOURCE
].flags
&
428 IORESOURCE_ROM_SHADOW
));
430 struct device_attribute vga_attr
= __ATTR_RO(boot_vga
);
433 pci_read_config(struct file
*filp
, struct kobject
*kobj
,
434 struct bin_attribute
*bin_attr
,
435 char *buf
, loff_t off
, size_t count
)
437 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
,struct device
,kobj
));
438 unsigned int size
= 64;
439 loff_t init_off
= off
;
440 u8
*data
= (u8
*) buf
;
442 /* Several chips lock up trying to read undefined config space */
443 if (security_capable(filp
->f_cred
, &init_user_ns
, CAP_SYS_ADMIN
) == 0) {
444 size
= dev
->cfg_size
;
445 } else if (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
) {
451 if (off
+ count
> size
) {
458 if ((off
& 1) && size
) {
460 pci_user_read_config_byte(dev
, off
, &val
);
461 data
[off
- init_off
] = val
;
466 if ((off
& 3) && size
> 2) {
468 pci_user_read_config_word(dev
, off
, &val
);
469 data
[off
- init_off
] = val
& 0xff;
470 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
477 pci_user_read_config_dword(dev
, off
, &val
);
478 data
[off
- init_off
] = val
& 0xff;
479 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
480 data
[off
- init_off
+ 2] = (val
>> 16) & 0xff;
481 data
[off
- init_off
+ 3] = (val
>> 24) & 0xff;
488 pci_user_read_config_word(dev
, off
, &val
);
489 data
[off
- init_off
] = val
& 0xff;
490 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
497 pci_user_read_config_byte(dev
, off
, &val
);
498 data
[off
- init_off
] = val
;
507 pci_write_config(struct file
* filp
, struct kobject
*kobj
,
508 struct bin_attribute
*bin_attr
,
509 char *buf
, loff_t off
, size_t count
)
511 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
,struct device
,kobj
));
512 unsigned int size
= count
;
513 loff_t init_off
= off
;
514 u8
*data
= (u8
*) buf
;
516 if (off
> dev
->cfg_size
)
518 if (off
+ count
> dev
->cfg_size
) {
519 size
= dev
->cfg_size
- off
;
523 if ((off
& 1) && size
) {
524 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
529 if ((off
& 3) && size
> 2) {
530 u16 val
= data
[off
- init_off
];
531 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
532 pci_user_write_config_word(dev
, off
, val
);
538 u32 val
= data
[off
- init_off
];
539 val
|= (u32
) data
[off
- init_off
+ 1] << 8;
540 val
|= (u32
) data
[off
- init_off
+ 2] << 16;
541 val
|= (u32
) data
[off
- init_off
+ 3] << 24;
542 pci_user_write_config_dword(dev
, off
, val
);
548 u16 val
= data
[off
- init_off
];
549 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
550 pci_user_write_config_word(dev
, off
, val
);
556 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
565 read_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
566 struct bin_attribute
*bin_attr
,
567 char *buf
, loff_t off
, size_t count
)
569 struct pci_dev
*dev
=
570 to_pci_dev(container_of(kobj
, struct device
, kobj
));
572 if (off
> bin_attr
->size
)
574 else if (count
> bin_attr
->size
- off
)
575 count
= bin_attr
->size
- off
;
577 return pci_read_vpd(dev
, off
, count
, buf
);
581 write_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
582 struct bin_attribute
*bin_attr
,
583 char *buf
, loff_t off
, size_t count
)
585 struct pci_dev
*dev
=
586 to_pci_dev(container_of(kobj
, struct device
, kobj
));
588 if (off
> bin_attr
->size
)
590 else if (count
> bin_attr
->size
- off
)
591 count
= bin_attr
->size
- off
;
593 return pci_write_vpd(dev
, off
, count
, buf
);
596 #ifdef HAVE_PCI_LEGACY
598 * pci_read_legacy_io - read byte(s) from legacy I/O port space
599 * @filp: open sysfs file
600 * @kobj: kobject corresponding to file to read from
601 * @bin_attr: struct bin_attribute for this file
602 * @buf: buffer to store results
603 * @off: offset into legacy I/O port space
604 * @count: number of bytes to read
606 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
607 * callback routine (pci_legacy_read).
610 pci_read_legacy_io(struct file
*filp
, struct kobject
*kobj
,
611 struct bin_attribute
*bin_attr
,
612 char *buf
, loff_t off
, size_t count
)
614 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
618 /* Only support 1, 2 or 4 byte accesses */
619 if (count
!= 1 && count
!= 2 && count
!= 4)
622 return pci_legacy_read(bus
, off
, (u32
*)buf
, count
);
626 * pci_write_legacy_io - write byte(s) to legacy I/O port space
627 * @filp: open sysfs file
628 * @kobj: kobject corresponding to file to read from
629 * @bin_attr: struct bin_attribute for this file
630 * @buf: buffer containing value to be written
631 * @off: offset into legacy I/O port space
632 * @count: number of bytes to write
634 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
635 * callback routine (pci_legacy_write).
638 pci_write_legacy_io(struct file
*filp
, struct kobject
*kobj
,
639 struct bin_attribute
*bin_attr
,
640 char *buf
, loff_t off
, size_t count
)
642 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
645 /* Only support 1, 2 or 4 byte accesses */
646 if (count
!= 1 && count
!= 2 && count
!= 4)
649 return pci_legacy_write(bus
, off
, *(u32
*)buf
, count
);
653 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
654 * @filp: open sysfs file
655 * @kobj: kobject corresponding to device to be mapped
656 * @attr: struct bin_attribute for this file
657 * @vma: struct vm_area_struct passed to mmap
659 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
660 * legacy memory space (first meg of bus space) into application virtual
664 pci_mmap_legacy_mem(struct file
*filp
, struct kobject
*kobj
,
665 struct bin_attribute
*attr
,
666 struct vm_area_struct
*vma
)
668 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
672 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_mem
);
676 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
677 * @filp: open sysfs file
678 * @kobj: kobject corresponding to device to be mapped
679 * @attr: struct bin_attribute for this file
680 * @vma: struct vm_area_struct passed to mmap
682 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
683 * legacy IO space (first meg of bus space) into application virtual
684 * memory space. Returns -ENOSYS if the operation isn't supported
687 pci_mmap_legacy_io(struct file
*filp
, struct kobject
*kobj
,
688 struct bin_attribute
*attr
,
689 struct vm_area_struct
*vma
)
691 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
695 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_io
);
699 * pci_adjust_legacy_attr - adjustment of legacy file attributes
700 * @b: bus to create files under
701 * @mmap_type: I/O port or memory
703 * Stub implementation. Can be overridden by arch if necessary.
706 pci_adjust_legacy_attr(struct pci_bus
*b
, enum pci_mmap_state mmap_type
)
712 * pci_create_legacy_files - create legacy I/O port and memory files
713 * @b: bus to create files under
715 * Some platforms allow access to legacy I/O port and ISA memory space on
716 * a per-bus basis. This routine creates the files and ties them into
717 * their associated read, write and mmap files from pci-sysfs.c
719 * On error unwind, but don't propagate the error to the caller
720 * as it is ok to set up the PCI bus without these files.
722 void pci_create_legacy_files(struct pci_bus
*b
)
726 b
->legacy_io
= kzalloc(sizeof(struct bin_attribute
) * 2,
731 sysfs_bin_attr_init(b
->legacy_io
);
732 b
->legacy_io
->attr
.name
= "legacy_io";
733 b
->legacy_io
->size
= 0xffff;
734 b
->legacy_io
->attr
.mode
= S_IRUSR
| S_IWUSR
;
735 b
->legacy_io
->read
= pci_read_legacy_io
;
736 b
->legacy_io
->write
= pci_write_legacy_io
;
737 b
->legacy_io
->mmap
= pci_mmap_legacy_io
;
738 pci_adjust_legacy_attr(b
, pci_mmap_io
);
739 error
= device_create_bin_file(&b
->dev
, b
->legacy_io
);
743 /* Allocated above after the legacy_io struct */
744 b
->legacy_mem
= b
->legacy_io
+ 1;
745 sysfs_bin_attr_init(b
->legacy_mem
);
746 b
->legacy_mem
->attr
.name
= "legacy_mem";
747 b
->legacy_mem
->size
= 1024*1024;
748 b
->legacy_mem
->attr
.mode
= S_IRUSR
| S_IWUSR
;
749 b
->legacy_mem
->mmap
= pci_mmap_legacy_mem
;
750 pci_adjust_legacy_attr(b
, pci_mmap_mem
);
751 error
= device_create_bin_file(&b
->dev
, b
->legacy_mem
);
758 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
763 printk(KERN_WARNING
"pci: warning: could not create legacy I/O port "
764 "and ISA memory resources to sysfs\n");
768 void pci_remove_legacy_files(struct pci_bus
*b
)
771 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
772 device_remove_bin_file(&b
->dev
, b
->legacy_mem
);
773 kfree(b
->legacy_io
); /* both are allocated here */
776 #endif /* HAVE_PCI_LEGACY */
780 int pci_mmap_fits(struct pci_dev
*pdev
, int resno
, struct vm_area_struct
*vma
,
781 enum pci_mmap_api mmap_api
)
783 unsigned long nr
, start
, size
, pci_start
;
785 if (pci_resource_len(pdev
, resno
) == 0)
787 nr
= (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
788 start
= vma
->vm_pgoff
;
789 size
= ((pci_resource_len(pdev
, resno
) - 1) >> PAGE_SHIFT
) + 1;
790 pci_start
= (mmap_api
== PCI_MMAP_PROCFS
) ?
791 pci_resource_start(pdev
, resno
) >> PAGE_SHIFT
: 0;
792 if (start
>= pci_start
&& start
< pci_start
+ size
&&
793 start
+ nr
<= pci_start
+ size
)
799 * pci_mmap_resource - map a PCI resource into user memory space
800 * @kobj: kobject for mapping
801 * @attr: struct bin_attribute for the file being mapped
802 * @vma: struct vm_area_struct passed into the mmap
803 * @write_combine: 1 for write_combine mapping
805 * Use the regular PCI mapping routines to map a PCI resource into userspace.
808 pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
809 struct vm_area_struct
*vma
, int write_combine
)
811 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
812 struct device
, kobj
));
813 struct resource
*res
= attr
->private;
814 enum pci_mmap_state mmap_type
;
815 resource_size_t start
, end
;
818 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
819 if (res
== &pdev
->resource
[i
])
821 if (i
>= PCI_ROM_RESOURCE
)
824 if (!pci_mmap_fits(pdev
, i
, vma
, PCI_MMAP_SYSFS
)) {
825 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
826 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
827 current
->comm
, vma
->vm_end
-vma
->vm_start
, vma
->vm_pgoff
,
829 (u64
)pci_resource_start(pdev
, i
),
830 (u64
)pci_resource_len(pdev
, i
));
834 /* pci_mmap_page_range() expects the same kind of entry as coming
835 * from /proc/bus/pci/ which is a "user visible" value. If this is
836 * different from the resource itself, arch will do necessary fixup.
838 pci_resource_to_user(pdev
, i
, res
, &start
, &end
);
839 vma
->vm_pgoff
+= start
>> PAGE_SHIFT
;
840 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
842 if (res
->flags
& IORESOURCE_MEM
&& iomem_is_exclusive(start
))
845 return pci_mmap_page_range(pdev
, vma
, mmap_type
, write_combine
);
849 pci_mmap_resource_uc(struct file
*filp
, struct kobject
*kobj
,
850 struct bin_attribute
*attr
,
851 struct vm_area_struct
*vma
)
853 return pci_mmap_resource(kobj
, attr
, vma
, 0);
857 pci_mmap_resource_wc(struct file
*filp
, struct kobject
*kobj
,
858 struct bin_attribute
*attr
,
859 struct vm_area_struct
*vma
)
861 return pci_mmap_resource(kobj
, attr
, vma
, 1);
865 pci_resource_io(struct file
*filp
, struct kobject
*kobj
,
866 struct bin_attribute
*attr
, char *buf
,
867 loff_t off
, size_t count
, bool write
)
869 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
870 struct device
, kobj
));
871 struct resource
*res
= attr
->private;
872 unsigned long port
= off
;
875 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
876 if (res
== &pdev
->resource
[i
])
878 if (i
>= PCI_ROM_RESOURCE
)
881 port
+= pci_resource_start(pdev
, i
);
883 if (port
> pci_resource_end(pdev
, i
))
886 if (port
+ count
- 1 > pci_resource_end(pdev
, i
))
892 outb(*(u8
*)buf
, port
);
894 *(u8
*)buf
= inb(port
);
898 outw(*(u16
*)buf
, port
);
900 *(u16
*)buf
= inw(port
);
904 outl(*(u32
*)buf
, port
);
906 *(u32
*)buf
= inl(port
);
913 pci_read_resource_io(struct file
*filp
, struct kobject
*kobj
,
914 struct bin_attribute
*attr
, char *buf
,
915 loff_t off
, size_t count
)
917 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, false);
921 pci_write_resource_io(struct file
*filp
, struct kobject
*kobj
,
922 struct bin_attribute
*attr
, char *buf
,
923 loff_t off
, size_t count
)
925 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, true);
929 * pci_remove_resource_files - cleanup resource files
930 * @pdev: dev to cleanup
932 * If we created resource files for @pdev, remove them from sysfs and
933 * free their resources.
936 pci_remove_resource_files(struct pci_dev
*pdev
)
940 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
941 struct bin_attribute
*res_attr
;
943 res_attr
= pdev
->res_attr
[i
];
945 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
949 res_attr
= pdev
->res_attr_wc
[i
];
951 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
957 static int pci_create_attr(struct pci_dev
*pdev
, int num
, int write_combine
)
959 /* allocate attribute structure, piggyback attribute name */
960 int name_len
= write_combine
? 13 : 10;
961 struct bin_attribute
*res_attr
;
964 res_attr
= kzalloc(sizeof(*res_attr
) + name_len
, GFP_ATOMIC
);
966 char *res_attr_name
= (char *)(res_attr
+ 1);
968 sysfs_bin_attr_init(res_attr
);
970 pdev
->res_attr_wc
[num
] = res_attr
;
971 sprintf(res_attr_name
, "resource%d_wc", num
);
972 res_attr
->mmap
= pci_mmap_resource_wc
;
974 pdev
->res_attr
[num
] = res_attr
;
975 sprintf(res_attr_name
, "resource%d", num
);
976 res_attr
->mmap
= pci_mmap_resource_uc
;
978 if (pci_resource_flags(pdev
, num
) & IORESOURCE_IO
) {
979 res_attr
->read
= pci_read_resource_io
;
980 res_attr
->write
= pci_write_resource_io
;
982 res_attr
->attr
.name
= res_attr_name
;
983 res_attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
984 res_attr
->size
= pci_resource_len(pdev
, num
);
985 res_attr
->private = &pdev
->resource
[num
];
986 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
994 * pci_create_resource_files - create resource files in sysfs for @dev
995 * @pdev: dev in question
997 * Walk the resources in @pdev creating files for each resource available.
999 static int pci_create_resource_files(struct pci_dev
*pdev
)
1004 /* Expose the PCI resources from this device as files */
1005 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1007 /* skip empty resources */
1008 if (!pci_resource_len(pdev
, i
))
1011 retval
= pci_create_attr(pdev
, i
, 0);
1012 /* for prefetchable resources, create a WC mappable file */
1013 if (!retval
&& pdev
->resource
[i
].flags
& IORESOURCE_PREFETCH
)
1014 retval
= pci_create_attr(pdev
, i
, 1);
1017 pci_remove_resource_files(pdev
);
1023 #else /* !HAVE_PCI_MMAP */
1024 int __weak
pci_create_resource_files(struct pci_dev
*dev
) { return 0; }
1025 void __weak
pci_remove_resource_files(struct pci_dev
*dev
) { return; }
1026 #endif /* HAVE_PCI_MMAP */
1029 * pci_write_rom - used to enable access to the PCI ROM display
1031 * @kobj: kernel object handle
1032 * @bin_attr: struct bin_attribute for this file
1035 * @count: number of byte in input
1037 * writing anything except 0 enables it
1040 pci_write_rom(struct file
*filp
, struct kobject
*kobj
,
1041 struct bin_attribute
*bin_attr
,
1042 char *buf
, loff_t off
, size_t count
)
1044 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1046 if ((off
== 0) && (*buf
== '0') && (count
== 2))
1047 pdev
->rom_attr_enabled
= 0;
1049 pdev
->rom_attr_enabled
= 1;
1055 * pci_read_rom - read a PCI ROM
1057 * @kobj: kernel object handle
1058 * @bin_attr: struct bin_attribute for this file
1059 * @buf: where to put the data we read from the ROM
1061 * @count: number of bytes to read
1063 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1064 * device corresponding to @kobj.
1067 pci_read_rom(struct file
*filp
, struct kobject
*kobj
,
1068 struct bin_attribute
*bin_attr
,
1069 char *buf
, loff_t off
, size_t count
)
1071 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1075 if (!pdev
->rom_attr_enabled
)
1078 rom
= pci_map_rom(pdev
, &size
); /* size starts out as PCI window size */
1085 if (off
+ count
> size
)
1088 memcpy_fromio(buf
, rom
+ off
, count
);
1090 pci_unmap_rom(pdev
, rom
);
1095 static struct bin_attribute pci_config_attr
= {
1098 .mode
= S_IRUGO
| S_IWUSR
,
1100 .size
= PCI_CFG_SPACE_SIZE
,
1101 .read
= pci_read_config
,
1102 .write
= pci_write_config
,
1105 static struct bin_attribute pcie_config_attr
= {
1108 .mode
= S_IRUGO
| S_IWUSR
,
1110 .size
= PCI_CFG_SPACE_EXP_SIZE
,
1111 .read
= pci_read_config
,
1112 .write
= pci_write_config
,
1115 int __attribute__ ((weak
)) pcibios_add_platform_entries(struct pci_dev
*dev
)
1120 static ssize_t
reset_store(struct device
*dev
,
1121 struct device_attribute
*attr
, const char *buf
,
1124 struct pci_dev
*pdev
= to_pci_dev(dev
);
1126 ssize_t result
= strict_strtoul(buf
, 0, &val
);
1134 result
= pci_reset_function(pdev
);
1141 static struct device_attribute reset_attr
= __ATTR(reset
, 0200, NULL
, reset_store
);
1143 static int pci_create_capabilities_sysfs(struct pci_dev
*dev
)
1146 struct bin_attribute
*attr
;
1148 /* If the device has VPD, try to expose it in sysfs. */
1150 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1154 sysfs_bin_attr_init(attr
);
1155 attr
->size
= dev
->vpd
->len
;
1156 attr
->attr
.name
= "vpd";
1157 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1158 attr
->read
= read_vpd_attr
;
1159 attr
->write
= write_vpd_attr
;
1160 retval
= sysfs_create_bin_file(&dev
->dev
.kobj
, attr
);
1165 dev
->vpd
->attr
= attr
;
1168 /* Active State Power Management */
1169 pcie_aspm_create_sysfs_dev_files(dev
);
1171 if (!pci_probe_reset_function(dev
)) {
1172 retval
= device_create_file(&dev
->dev
, &reset_attr
);
1180 pcie_aspm_remove_sysfs_dev_files(dev
);
1181 if (dev
->vpd
&& dev
->vpd
->attr
) {
1182 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1183 kfree(dev
->vpd
->attr
);
1189 int __must_check
pci_create_sysfs_dev_files (struct pci_dev
*pdev
)
1193 struct bin_attribute
*attr
;
1195 if (!sysfs_initialized
)
1198 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1199 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1201 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1205 retval
= pci_create_resource_files(pdev
);
1207 goto err_config_file
;
1209 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1210 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1211 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1214 /* If the device has a ROM, try to expose it in sysfs. */
1216 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1219 goto err_resource_files
;
1221 sysfs_bin_attr_init(attr
);
1222 attr
->size
= rom_size
;
1223 attr
->attr
.name
= "rom";
1224 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1225 attr
->read
= pci_read_rom
;
1226 attr
->write
= pci_write_rom
;
1227 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, attr
);
1230 goto err_resource_files
;
1232 pdev
->rom_attr
= attr
;
1235 if ((pdev
->class >> 8) == PCI_CLASS_DISPLAY_VGA
) {
1236 retval
= device_create_file(&pdev
->dev
, &vga_attr
);
1241 /* add platform-specific attributes */
1242 retval
= pcibios_add_platform_entries(pdev
);
1246 /* add sysfs entries for various capabilities */
1247 retval
= pci_create_capabilities_sysfs(pdev
);
1251 pci_create_firmware_label_files(pdev
);
1256 if ((pdev
->class >> 8) == PCI_CLASS_DISPLAY_VGA
)
1257 device_remove_file(&pdev
->dev
, &vga_attr
);
1260 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1261 kfree(pdev
->rom_attr
);
1262 pdev
->rom_attr
= NULL
;
1265 pci_remove_resource_files(pdev
);
1267 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1268 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1270 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1275 static void pci_remove_capabilities_sysfs(struct pci_dev
*dev
)
1277 if (dev
->vpd
&& dev
->vpd
->attr
) {
1278 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1279 kfree(dev
->vpd
->attr
);
1282 pcie_aspm_remove_sysfs_dev_files(dev
);
1283 if (dev
->reset_fn
) {
1284 device_remove_file(&dev
->dev
, &reset_attr
);
1290 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1291 * @pdev: device whose entries we should free
1293 * Cleanup when @pdev is removed from sysfs.
1295 void pci_remove_sysfs_dev_files(struct pci_dev
*pdev
)
1299 if (!sysfs_initialized
)
1302 pci_remove_capabilities_sysfs(pdev
);
1304 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1305 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1307 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1309 pci_remove_resource_files(pdev
);
1311 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1312 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1313 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1316 if (rom_size
&& pdev
->rom_attr
) {
1317 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1318 kfree(pdev
->rom_attr
);
1321 pci_remove_firmware_label_files(pdev
);
1325 static int __init
pci_sysfs_init(void)
1327 struct pci_dev
*pdev
= NULL
;
1330 sysfs_initialized
= 1;
1331 for_each_pci_dev(pdev
) {
1332 retval
= pci_create_sysfs_dev_files(pdev
);
1342 late_initcall(pci_sysfs_init
);