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>
31 #include <linux/pm_runtime.h>
34 static int sysfs_initialized
; /* = 0 */
36 /* show configuration fields */
37 #define pci_config_attr(field, format_string) \
39 field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
41 struct pci_dev *pdev; \
43 pdev = to_pci_dev (dev); \
44 return sprintf (buf, format_string, pdev->field); \
47 pci_config_attr(vendor
, "0x%04x\n");
48 pci_config_attr(device
, "0x%04x\n");
49 pci_config_attr(subsystem_vendor
, "0x%04x\n");
50 pci_config_attr(subsystem_device
, "0x%04x\n");
51 pci_config_attr(class, "0x%06x\n");
52 pci_config_attr(irq
, "%u\n");
54 static ssize_t
broken_parity_status_show(struct device
*dev
,
55 struct device_attribute
*attr
,
58 struct pci_dev
*pdev
= to_pci_dev(dev
);
59 return sprintf (buf
, "%u\n", pdev
->broken_parity_status
);
62 static ssize_t
broken_parity_status_store(struct device
*dev
,
63 struct device_attribute
*attr
,
64 const char *buf
, size_t count
)
66 struct pci_dev
*pdev
= to_pci_dev(dev
);
69 if (strict_strtoul(buf
, 0, &val
) < 0)
72 pdev
->broken_parity_status
= !!val
;
77 static ssize_t
local_cpus_show(struct device
*dev
,
78 struct device_attribute
*attr
, char *buf
)
80 const struct cpumask
*mask
;
84 mask
= (dev_to_node(dev
) == -1) ? cpu_online_mask
:
85 cpumask_of_node(dev_to_node(dev
));
87 mask
= cpumask_of_pcibus(to_pci_dev(dev
)->bus
);
89 len
= cpumask_scnprintf(buf
, PAGE_SIZE
-2, mask
);
96 static ssize_t
local_cpulist_show(struct device
*dev
,
97 struct device_attribute
*attr
, char *buf
)
99 const struct cpumask
*mask
;
103 mask
= (dev_to_node(dev
) == -1) ? cpu_online_mask
:
104 cpumask_of_node(dev_to_node(dev
));
106 mask
= cpumask_of_pcibus(to_pci_dev(dev
)->bus
);
108 len
= cpulist_scnprintf(buf
, PAGE_SIZE
-2, mask
);
115 * PCI Bus Class Devices
117 static ssize_t
pci_bus_show_cpuaffinity(struct device
*dev
,
119 struct device_attribute
*attr
,
123 const struct cpumask
*cpumask
;
125 cpumask
= cpumask_of_pcibus(to_pci_bus(dev
));
127 cpulist_scnprintf(buf
, PAGE_SIZE
-2, cpumask
) :
128 cpumask_scnprintf(buf
, PAGE_SIZE
-2, cpumask
);
134 static inline ssize_t
pci_bus_show_cpumaskaffinity(struct device
*dev
,
135 struct device_attribute
*attr
,
138 return pci_bus_show_cpuaffinity(dev
, 0, attr
, buf
);
141 static inline ssize_t
pci_bus_show_cpulistaffinity(struct device
*dev
,
142 struct device_attribute
*attr
,
145 return pci_bus_show_cpuaffinity(dev
, 1, attr
, buf
);
150 resource_show(struct device
* dev
, struct device_attribute
*attr
, char * buf
)
152 struct pci_dev
* pci_dev
= to_pci_dev(dev
);
156 resource_size_t start
, end
;
158 if (pci_dev
->subordinate
)
159 max
= DEVICE_COUNT_RESOURCE
;
161 max
= PCI_BRIDGE_RESOURCES
;
163 for (i
= 0; i
< max
; i
++) {
164 struct resource
*res
= &pci_dev
->resource
[i
];
165 pci_resource_to_user(pci_dev
, i
, res
, &start
, &end
);
166 str
+= sprintf(str
,"0x%016llx 0x%016llx 0x%016llx\n",
167 (unsigned long long)start
,
168 (unsigned long long)end
,
169 (unsigned long long)res
->flags
);
174 static ssize_t
modalias_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
176 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
178 return sprintf(buf
, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
179 pci_dev
->vendor
, pci_dev
->device
,
180 pci_dev
->subsystem_vendor
, pci_dev
->subsystem_device
,
181 (u8
)(pci_dev
->class >> 16), (u8
)(pci_dev
->class >> 8),
182 (u8
)(pci_dev
->class));
185 static ssize_t
is_enabled_store(struct device
*dev
,
186 struct device_attribute
*attr
, const char *buf
,
189 struct pci_dev
*pdev
= to_pci_dev(dev
);
191 ssize_t result
= strict_strtoul(buf
, 0, &val
);
196 /* this can crash the machine when done on the "wrong" device */
197 if (!capable(CAP_SYS_ADMIN
))
201 if (pci_is_enabled(pdev
))
202 pci_disable_device(pdev
);
206 result
= pci_enable_device(pdev
);
208 return result
< 0 ? result
: count
;
211 static ssize_t
is_enabled_show(struct device
*dev
,
212 struct device_attribute
*attr
, char *buf
)
214 struct pci_dev
*pdev
;
216 pdev
= to_pci_dev (dev
);
217 return sprintf (buf
, "%u\n", atomic_read(&pdev
->enable_cnt
));
222 numa_node_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
224 return sprintf (buf
, "%d\n", dev
->numa_node
);
229 dma_mask_bits_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
231 struct pci_dev
*pdev
= to_pci_dev(dev
);
233 return sprintf (buf
, "%d\n", fls64(pdev
->dma_mask
));
237 consistent_dma_mask_bits_show(struct device
*dev
, struct device_attribute
*attr
,
240 return sprintf (buf
, "%d\n", fls64(dev
->coherent_dma_mask
));
244 msi_bus_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
246 struct pci_dev
*pdev
= to_pci_dev(dev
);
248 if (!pdev
->subordinate
)
251 return sprintf (buf
, "%u\n",
252 !(pdev
->subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
));
256 msi_bus_store(struct device
*dev
, struct device_attribute
*attr
,
257 const char *buf
, size_t count
)
259 struct pci_dev
*pdev
= to_pci_dev(dev
);
262 if (strict_strtoul(buf
, 0, &val
) < 0)
265 /* bad things may happen if the no_msi flag is changed
266 * while some drivers are loaded */
267 if (!capable(CAP_SYS_ADMIN
))
270 /* Maybe pci devices without subordinate busses shouldn't even have this
271 * attribute in the first place? */
272 if (!pdev
->subordinate
)
275 /* Is the flag going to change, or keep the value it already had? */
276 if (!(pdev
->subordinate
->bus_flags
& PCI_BUS_FLAGS_NO_MSI
) ^
278 pdev
->subordinate
->bus_flags
^= PCI_BUS_FLAGS_NO_MSI
;
280 dev_warn(&pdev
->dev
, "forced subordinate bus to%s support MSI,"
281 " bad things could happen\n", val
? "" : " not");
287 #ifdef CONFIG_HOTPLUG
288 static DEFINE_MUTEX(pci_remove_rescan_mutex
);
289 static ssize_t
bus_rescan_store(struct bus_type
*bus
, const char *buf
,
293 struct pci_bus
*b
= NULL
;
295 if (strict_strtoul(buf
, 0, &val
) < 0)
299 mutex_lock(&pci_remove_rescan_mutex
);
300 while ((b
= pci_find_next_bus(b
)) != NULL
)
302 mutex_unlock(&pci_remove_rescan_mutex
);
307 struct bus_attribute pci_bus_attrs
[] = {
308 __ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, bus_rescan_store
),
313 dev_rescan_store(struct device
*dev
, struct device_attribute
*attr
,
314 const char *buf
, size_t count
)
317 struct pci_dev
*pdev
= to_pci_dev(dev
);
319 if (strict_strtoul(buf
, 0, &val
) < 0)
323 mutex_lock(&pci_remove_rescan_mutex
);
324 pci_rescan_bus(pdev
->bus
);
325 mutex_unlock(&pci_remove_rescan_mutex
);
330 static void remove_callback(struct device
*dev
)
332 struct pci_dev
*pdev
= to_pci_dev(dev
);
334 mutex_lock(&pci_remove_rescan_mutex
);
335 pci_stop_and_remove_bus_device(pdev
);
336 mutex_unlock(&pci_remove_rescan_mutex
);
340 remove_store(struct device
*dev
, struct device_attribute
*dummy
,
341 const char *buf
, size_t count
)
346 if (strict_strtoul(buf
, 0, &val
) < 0)
349 /* An attribute cannot be unregistered by one of its own methods,
350 * so we have to use this roundabout approach.
353 ret
= device_schedule_callback(dev
, remove_callback
);
360 dev_bus_rescan_store(struct device
*dev
, struct device_attribute
*attr
,
361 const char *buf
, size_t count
)
364 struct pci_bus
*bus
= to_pci_bus(dev
);
366 if (strict_strtoul(buf
, 0, &val
) < 0)
370 mutex_lock(&pci_remove_rescan_mutex
);
371 if (!pci_is_root_bus(bus
) && list_empty(&bus
->devices
))
372 pci_rescan_bus_bridge_resize(bus
->self
);
375 mutex_unlock(&pci_remove_rescan_mutex
);
382 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
383 static ssize_t
d3cold_allowed_store(struct device
*dev
,
384 struct device_attribute
*attr
,
385 const char *buf
, size_t count
)
387 struct pci_dev
*pdev
= to_pci_dev(dev
);
390 if (strict_strtoul(buf
, 0, &val
) < 0)
393 pdev
->d3cold_allowed
= !!val
;
394 pm_runtime_resume(dev
);
399 static ssize_t
d3cold_allowed_show(struct device
*dev
,
400 struct device_attribute
*attr
, char *buf
)
402 struct pci_dev
*pdev
= to_pci_dev(dev
);
403 return sprintf (buf
, "%u\n", pdev
->d3cold_allowed
);
407 struct device_attribute pci_dev_attrs
[] = {
411 __ATTR_RO(subsystem_vendor
),
412 __ATTR_RO(subsystem_device
),
415 __ATTR_RO(local_cpus
),
416 __ATTR_RO(local_cpulist
),
419 __ATTR_RO(numa_node
),
421 __ATTR_RO(dma_mask_bits
),
422 __ATTR_RO(consistent_dma_mask_bits
),
423 __ATTR(enable
, 0600, is_enabled_show
, is_enabled_store
),
424 __ATTR(broken_parity_status
,(S_IRUGO
|S_IWUSR
),
425 broken_parity_status_show
,broken_parity_status_store
),
426 __ATTR(msi_bus
, 0644, msi_bus_show
, msi_bus_store
),
427 #ifdef CONFIG_HOTPLUG
428 __ATTR(remove
, (S_IWUSR
|S_IWGRP
), NULL
, remove_store
),
429 __ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, dev_rescan_store
),
431 #if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
432 __ATTR(d3cold_allowed
, 0644, d3cold_allowed_show
, d3cold_allowed_store
),
437 struct device_attribute pcibus_dev_attrs
[] = {
438 #ifdef CONFIG_HOTPLUG
439 __ATTR(rescan
, (S_IWUSR
|S_IWGRP
), NULL
, dev_bus_rescan_store
),
441 __ATTR(cpuaffinity
, S_IRUGO
, pci_bus_show_cpumaskaffinity
, NULL
),
442 __ATTR(cpulistaffinity
, S_IRUGO
, pci_bus_show_cpulistaffinity
, NULL
),
447 boot_vga_show(struct device
*dev
, struct device_attribute
*attr
, char *buf
)
449 struct pci_dev
*pdev
= to_pci_dev(dev
);
450 struct pci_dev
*vga_dev
= vga_default_device();
453 return sprintf(buf
, "%u\n", (pdev
== vga_dev
));
455 return sprintf(buf
, "%u\n",
456 !!(pdev
->resource
[PCI_ROM_RESOURCE
].flags
&
457 IORESOURCE_ROM_SHADOW
));
459 struct device_attribute vga_attr
= __ATTR_RO(boot_vga
);
462 pci_read_config(struct file
*filp
, struct kobject
*kobj
,
463 struct bin_attribute
*bin_attr
,
464 char *buf
, loff_t off
, size_t count
)
466 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
,struct device
,kobj
));
467 unsigned int size
= 64;
468 loff_t init_off
= off
;
469 u8
*data
= (u8
*) buf
;
471 /* Several chips lock up trying to read undefined config space */
472 if (security_capable(filp
->f_cred
, &init_user_ns
, CAP_SYS_ADMIN
) == 0) {
473 size
= dev
->cfg_size
;
474 } else if (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
) {
480 if (off
+ count
> size
) {
487 pci_config_pm_runtime_get(dev
);
489 if ((off
& 1) && size
) {
491 pci_user_read_config_byte(dev
, off
, &val
);
492 data
[off
- init_off
] = val
;
497 if ((off
& 3) && size
> 2) {
499 pci_user_read_config_word(dev
, off
, &val
);
500 data
[off
- init_off
] = val
& 0xff;
501 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
508 pci_user_read_config_dword(dev
, off
, &val
);
509 data
[off
- init_off
] = val
& 0xff;
510 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
511 data
[off
- init_off
+ 2] = (val
>> 16) & 0xff;
512 data
[off
- init_off
+ 3] = (val
>> 24) & 0xff;
519 pci_user_read_config_word(dev
, off
, &val
);
520 data
[off
- init_off
] = val
& 0xff;
521 data
[off
- init_off
+ 1] = (val
>> 8) & 0xff;
528 pci_user_read_config_byte(dev
, off
, &val
);
529 data
[off
- init_off
] = val
;
534 pci_config_pm_runtime_put(dev
);
540 pci_write_config(struct file
* filp
, struct kobject
*kobj
,
541 struct bin_attribute
*bin_attr
,
542 char *buf
, loff_t off
, size_t count
)
544 struct pci_dev
*dev
= to_pci_dev(container_of(kobj
,struct device
,kobj
));
545 unsigned int size
= count
;
546 loff_t init_off
= off
;
547 u8
*data
= (u8
*) buf
;
549 if (off
> dev
->cfg_size
)
551 if (off
+ count
> dev
->cfg_size
) {
552 size
= dev
->cfg_size
- off
;
556 pci_config_pm_runtime_get(dev
);
558 if ((off
& 1) && size
) {
559 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
564 if ((off
& 3) && size
> 2) {
565 u16 val
= data
[off
- init_off
];
566 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
567 pci_user_write_config_word(dev
, off
, val
);
573 u32 val
= data
[off
- init_off
];
574 val
|= (u32
) data
[off
- init_off
+ 1] << 8;
575 val
|= (u32
) data
[off
- init_off
+ 2] << 16;
576 val
|= (u32
) data
[off
- init_off
+ 3] << 24;
577 pci_user_write_config_dword(dev
, off
, val
);
583 u16 val
= data
[off
- init_off
];
584 val
|= (u16
) data
[off
- init_off
+ 1] << 8;
585 pci_user_write_config_word(dev
, off
, val
);
591 pci_user_write_config_byte(dev
, off
, data
[off
- init_off
]);
596 pci_config_pm_runtime_put(dev
);
602 read_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
603 struct bin_attribute
*bin_attr
,
604 char *buf
, loff_t off
, size_t count
)
606 struct pci_dev
*dev
=
607 to_pci_dev(container_of(kobj
, struct device
, kobj
));
609 if (off
> bin_attr
->size
)
611 else if (count
> bin_attr
->size
- off
)
612 count
= bin_attr
->size
- off
;
614 return pci_read_vpd(dev
, off
, count
, buf
);
618 write_vpd_attr(struct file
*filp
, struct kobject
*kobj
,
619 struct bin_attribute
*bin_attr
,
620 char *buf
, loff_t off
, size_t count
)
622 struct pci_dev
*dev
=
623 to_pci_dev(container_of(kobj
, struct device
, kobj
));
625 if (off
> bin_attr
->size
)
627 else if (count
> bin_attr
->size
- off
)
628 count
= bin_attr
->size
- off
;
630 return pci_write_vpd(dev
, off
, count
, buf
);
633 #ifdef HAVE_PCI_LEGACY
635 * pci_read_legacy_io - read byte(s) from legacy I/O port space
636 * @filp: open sysfs file
637 * @kobj: kobject corresponding to file to read from
638 * @bin_attr: struct bin_attribute for this file
639 * @buf: buffer to store results
640 * @off: offset into legacy I/O port space
641 * @count: number of bytes to read
643 * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
644 * callback routine (pci_legacy_read).
647 pci_read_legacy_io(struct file
*filp
, struct kobject
*kobj
,
648 struct bin_attribute
*bin_attr
,
649 char *buf
, loff_t off
, size_t count
)
651 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
655 /* Only support 1, 2 or 4 byte accesses */
656 if (count
!= 1 && count
!= 2 && count
!= 4)
659 return pci_legacy_read(bus
, off
, (u32
*)buf
, count
);
663 * pci_write_legacy_io - write byte(s) to legacy I/O port space
664 * @filp: open sysfs file
665 * @kobj: kobject corresponding to file to read from
666 * @bin_attr: struct bin_attribute for this file
667 * @buf: buffer containing value to be written
668 * @off: offset into legacy I/O port space
669 * @count: number of bytes to write
671 * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
672 * callback routine (pci_legacy_write).
675 pci_write_legacy_io(struct file
*filp
, struct kobject
*kobj
,
676 struct bin_attribute
*bin_attr
,
677 char *buf
, loff_t off
, size_t count
)
679 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
682 /* Only support 1, 2 or 4 byte accesses */
683 if (count
!= 1 && count
!= 2 && count
!= 4)
686 return pci_legacy_write(bus
, off
, *(u32
*)buf
, count
);
690 * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
691 * @filp: open sysfs file
692 * @kobj: kobject corresponding to device to be mapped
693 * @attr: struct bin_attribute for this file
694 * @vma: struct vm_area_struct passed to mmap
696 * Uses an arch specific callback, pci_mmap_legacy_mem_page_range, to mmap
697 * legacy memory space (first meg of bus space) into application virtual
701 pci_mmap_legacy_mem(struct file
*filp
, struct kobject
*kobj
,
702 struct bin_attribute
*attr
,
703 struct vm_area_struct
*vma
)
705 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
709 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_mem
);
713 * pci_mmap_legacy_io - map legacy PCI IO into user memory space
714 * @filp: open sysfs file
715 * @kobj: kobject corresponding to device to be mapped
716 * @attr: struct bin_attribute for this file
717 * @vma: struct vm_area_struct passed to mmap
719 * Uses an arch specific callback, pci_mmap_legacy_io_page_range, to mmap
720 * legacy IO space (first meg of bus space) into application virtual
721 * memory space. Returns -ENOSYS if the operation isn't supported
724 pci_mmap_legacy_io(struct file
*filp
, struct kobject
*kobj
,
725 struct bin_attribute
*attr
,
726 struct vm_area_struct
*vma
)
728 struct pci_bus
*bus
= to_pci_bus(container_of(kobj
,
732 return pci_mmap_legacy_page_range(bus
, vma
, pci_mmap_io
);
736 * pci_adjust_legacy_attr - adjustment of legacy file attributes
737 * @b: bus to create files under
738 * @mmap_type: I/O port or memory
740 * Stub implementation. Can be overridden by arch if necessary.
743 pci_adjust_legacy_attr(struct pci_bus
*b
, enum pci_mmap_state mmap_type
)
749 * pci_create_legacy_files - create legacy I/O port and memory files
750 * @b: bus to create files under
752 * Some platforms allow access to legacy I/O port and ISA memory space on
753 * a per-bus basis. This routine creates the files and ties them into
754 * their associated read, write and mmap files from pci-sysfs.c
756 * On error unwind, but don't propagate the error to the caller
757 * as it is ok to set up the PCI bus without these files.
759 void pci_create_legacy_files(struct pci_bus
*b
)
763 b
->legacy_io
= kzalloc(sizeof(struct bin_attribute
) * 2,
768 sysfs_bin_attr_init(b
->legacy_io
);
769 b
->legacy_io
->attr
.name
= "legacy_io";
770 b
->legacy_io
->size
= 0xffff;
771 b
->legacy_io
->attr
.mode
= S_IRUSR
| S_IWUSR
;
772 b
->legacy_io
->read
= pci_read_legacy_io
;
773 b
->legacy_io
->write
= pci_write_legacy_io
;
774 b
->legacy_io
->mmap
= pci_mmap_legacy_io
;
775 pci_adjust_legacy_attr(b
, pci_mmap_io
);
776 error
= device_create_bin_file(&b
->dev
, b
->legacy_io
);
780 /* Allocated above after the legacy_io struct */
781 b
->legacy_mem
= b
->legacy_io
+ 1;
782 sysfs_bin_attr_init(b
->legacy_mem
);
783 b
->legacy_mem
->attr
.name
= "legacy_mem";
784 b
->legacy_mem
->size
= 1024*1024;
785 b
->legacy_mem
->attr
.mode
= S_IRUSR
| S_IWUSR
;
786 b
->legacy_mem
->mmap
= pci_mmap_legacy_mem
;
787 pci_adjust_legacy_attr(b
, pci_mmap_mem
);
788 error
= device_create_bin_file(&b
->dev
, b
->legacy_mem
);
795 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
800 printk(KERN_WARNING
"pci: warning: could not create legacy I/O port "
801 "and ISA memory resources to sysfs\n");
805 void pci_remove_legacy_files(struct pci_bus
*b
)
808 device_remove_bin_file(&b
->dev
, b
->legacy_io
);
809 device_remove_bin_file(&b
->dev
, b
->legacy_mem
);
810 kfree(b
->legacy_io
); /* both are allocated here */
813 #endif /* HAVE_PCI_LEGACY */
817 int pci_mmap_fits(struct pci_dev
*pdev
, int resno
, struct vm_area_struct
*vma
,
818 enum pci_mmap_api mmap_api
)
820 unsigned long nr
, start
, size
, pci_start
;
822 if (pci_resource_len(pdev
, resno
) == 0)
824 nr
= (vma
->vm_end
- vma
->vm_start
) >> PAGE_SHIFT
;
825 start
= vma
->vm_pgoff
;
826 size
= ((pci_resource_len(pdev
, resno
) - 1) >> PAGE_SHIFT
) + 1;
827 pci_start
= (mmap_api
== PCI_MMAP_PROCFS
) ?
828 pci_resource_start(pdev
, resno
) >> PAGE_SHIFT
: 0;
829 if (start
>= pci_start
&& start
< pci_start
+ size
&&
830 start
+ nr
<= pci_start
+ size
)
836 * pci_mmap_resource - map a PCI resource into user memory space
837 * @kobj: kobject for mapping
838 * @attr: struct bin_attribute for the file being mapped
839 * @vma: struct vm_area_struct passed into the mmap
840 * @write_combine: 1 for write_combine mapping
842 * Use the regular PCI mapping routines to map a PCI resource into userspace.
845 pci_mmap_resource(struct kobject
*kobj
, struct bin_attribute
*attr
,
846 struct vm_area_struct
*vma
, int write_combine
)
848 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
849 struct device
, kobj
));
850 struct resource
*res
= attr
->private;
851 enum pci_mmap_state mmap_type
;
852 resource_size_t start
, end
;
855 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
856 if (res
== &pdev
->resource
[i
])
858 if (i
>= PCI_ROM_RESOURCE
)
861 if (!pci_mmap_fits(pdev
, i
, vma
, PCI_MMAP_SYSFS
)) {
862 WARN(1, "process \"%s\" tried to map 0x%08lx bytes "
863 "at page 0x%08lx on %s BAR %d (start 0x%16Lx, size 0x%16Lx)\n",
864 current
->comm
, vma
->vm_end
-vma
->vm_start
, vma
->vm_pgoff
,
866 (u64
)pci_resource_start(pdev
, i
),
867 (u64
)pci_resource_len(pdev
, i
));
871 /* pci_mmap_page_range() expects the same kind of entry as coming
872 * from /proc/bus/pci/ which is a "user visible" value. If this is
873 * different from the resource itself, arch will do necessary fixup.
875 pci_resource_to_user(pdev
, i
, res
, &start
, &end
);
876 vma
->vm_pgoff
+= start
>> PAGE_SHIFT
;
877 mmap_type
= res
->flags
& IORESOURCE_MEM
? pci_mmap_mem
: pci_mmap_io
;
879 if (res
->flags
& IORESOURCE_MEM
&& iomem_is_exclusive(start
))
882 return pci_mmap_page_range(pdev
, vma
, mmap_type
, write_combine
);
886 pci_mmap_resource_uc(struct file
*filp
, struct kobject
*kobj
,
887 struct bin_attribute
*attr
,
888 struct vm_area_struct
*vma
)
890 return pci_mmap_resource(kobj
, attr
, vma
, 0);
894 pci_mmap_resource_wc(struct file
*filp
, struct kobject
*kobj
,
895 struct bin_attribute
*attr
,
896 struct vm_area_struct
*vma
)
898 return pci_mmap_resource(kobj
, attr
, vma
, 1);
902 pci_resource_io(struct file
*filp
, struct kobject
*kobj
,
903 struct bin_attribute
*attr
, char *buf
,
904 loff_t off
, size_t count
, bool write
)
906 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
,
907 struct device
, kobj
));
908 struct resource
*res
= attr
->private;
909 unsigned long port
= off
;
912 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++)
913 if (res
== &pdev
->resource
[i
])
915 if (i
>= PCI_ROM_RESOURCE
)
918 port
+= pci_resource_start(pdev
, i
);
920 if (port
> pci_resource_end(pdev
, i
))
923 if (port
+ count
- 1 > pci_resource_end(pdev
, i
))
929 outb(*(u8
*)buf
, port
);
931 *(u8
*)buf
= inb(port
);
935 outw(*(u16
*)buf
, port
);
937 *(u16
*)buf
= inw(port
);
941 outl(*(u32
*)buf
, port
);
943 *(u32
*)buf
= inl(port
);
950 pci_read_resource_io(struct file
*filp
, struct kobject
*kobj
,
951 struct bin_attribute
*attr
, char *buf
,
952 loff_t off
, size_t count
)
954 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, false);
958 pci_write_resource_io(struct file
*filp
, struct kobject
*kobj
,
959 struct bin_attribute
*attr
, char *buf
,
960 loff_t off
, size_t count
)
962 return pci_resource_io(filp
, kobj
, attr
, buf
, off
, count
, true);
966 * pci_remove_resource_files - cleanup resource files
967 * @pdev: dev to cleanup
969 * If we created resource files for @pdev, remove them from sysfs and
970 * free their resources.
973 pci_remove_resource_files(struct pci_dev
*pdev
)
977 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
978 struct bin_attribute
*res_attr
;
980 res_attr
= pdev
->res_attr
[i
];
982 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
986 res_attr
= pdev
->res_attr_wc
[i
];
988 sysfs_remove_bin_file(&pdev
->dev
.kobj
, res_attr
);
994 static int pci_create_attr(struct pci_dev
*pdev
, int num
, int write_combine
)
996 /* allocate attribute structure, piggyback attribute name */
997 int name_len
= write_combine
? 13 : 10;
998 struct bin_attribute
*res_attr
;
1001 res_attr
= kzalloc(sizeof(*res_attr
) + name_len
, GFP_ATOMIC
);
1003 char *res_attr_name
= (char *)(res_attr
+ 1);
1005 sysfs_bin_attr_init(res_attr
);
1006 if (write_combine
) {
1007 pdev
->res_attr_wc
[num
] = res_attr
;
1008 sprintf(res_attr_name
, "resource%d_wc", num
);
1009 res_attr
->mmap
= pci_mmap_resource_wc
;
1011 pdev
->res_attr
[num
] = res_attr
;
1012 sprintf(res_attr_name
, "resource%d", num
);
1013 res_attr
->mmap
= pci_mmap_resource_uc
;
1015 if (pci_resource_flags(pdev
, num
) & IORESOURCE_IO
) {
1016 res_attr
->read
= pci_read_resource_io
;
1017 res_attr
->write
= pci_write_resource_io
;
1019 res_attr
->attr
.name
= res_attr_name
;
1020 res_attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1021 res_attr
->size
= pci_resource_len(pdev
, num
);
1022 res_attr
->private = &pdev
->resource
[num
];
1023 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, res_attr
);
1031 * pci_create_resource_files - create resource files in sysfs for @dev
1032 * @pdev: dev in question
1034 * Walk the resources in @pdev creating files for each resource available.
1036 static int pci_create_resource_files(struct pci_dev
*pdev
)
1041 /* Expose the PCI resources from this device as files */
1042 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
1044 /* skip empty resources */
1045 if (!pci_resource_len(pdev
, i
))
1048 retval
= pci_create_attr(pdev
, i
, 0);
1049 /* for prefetchable resources, create a WC mappable file */
1050 if (!retval
&& pdev
->resource
[i
].flags
& IORESOURCE_PREFETCH
)
1051 retval
= pci_create_attr(pdev
, i
, 1);
1054 pci_remove_resource_files(pdev
);
1060 #else /* !HAVE_PCI_MMAP */
1061 int __weak
pci_create_resource_files(struct pci_dev
*dev
) { return 0; }
1062 void __weak
pci_remove_resource_files(struct pci_dev
*dev
) { return; }
1063 #endif /* HAVE_PCI_MMAP */
1066 * pci_write_rom - used to enable access to the PCI ROM display
1068 * @kobj: kernel object handle
1069 * @bin_attr: struct bin_attribute for this file
1072 * @count: number of byte in input
1074 * writing anything except 0 enables it
1077 pci_write_rom(struct file
*filp
, struct kobject
*kobj
,
1078 struct bin_attribute
*bin_attr
,
1079 char *buf
, loff_t off
, size_t count
)
1081 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1083 if ((off
== 0) && (*buf
== '0') && (count
== 2))
1084 pdev
->rom_attr_enabled
= 0;
1086 pdev
->rom_attr_enabled
= 1;
1092 * pci_read_rom - read a PCI ROM
1094 * @kobj: kernel object handle
1095 * @bin_attr: struct bin_attribute for this file
1096 * @buf: where to put the data we read from the ROM
1098 * @count: number of bytes to read
1100 * Put @count bytes starting at @off into @buf from the ROM in the PCI
1101 * device corresponding to @kobj.
1104 pci_read_rom(struct file
*filp
, struct kobject
*kobj
,
1105 struct bin_attribute
*bin_attr
,
1106 char *buf
, loff_t off
, size_t count
)
1108 struct pci_dev
*pdev
= to_pci_dev(container_of(kobj
, struct device
, kobj
));
1112 if (!pdev
->rom_attr_enabled
)
1115 rom
= pci_map_rom(pdev
, &size
); /* size starts out as PCI window size */
1122 if (off
+ count
> size
)
1125 memcpy_fromio(buf
, rom
+ off
, count
);
1127 pci_unmap_rom(pdev
, rom
);
1132 static struct bin_attribute pci_config_attr
= {
1135 .mode
= S_IRUGO
| S_IWUSR
,
1137 .size
= PCI_CFG_SPACE_SIZE
,
1138 .read
= pci_read_config
,
1139 .write
= pci_write_config
,
1142 static struct bin_attribute pcie_config_attr
= {
1145 .mode
= S_IRUGO
| S_IWUSR
,
1147 .size
= PCI_CFG_SPACE_EXP_SIZE
,
1148 .read
= pci_read_config
,
1149 .write
= pci_write_config
,
1152 int __weak
pcibios_add_platform_entries(struct pci_dev
*dev
)
1157 static ssize_t
reset_store(struct device
*dev
,
1158 struct device_attribute
*attr
, const char *buf
,
1161 struct pci_dev
*pdev
= to_pci_dev(dev
);
1163 ssize_t result
= strict_strtoul(buf
, 0, &val
);
1171 result
= pci_reset_function(pdev
);
1178 static struct device_attribute reset_attr
= __ATTR(reset
, 0200, NULL
, reset_store
);
1180 static int pci_create_capabilities_sysfs(struct pci_dev
*dev
)
1183 struct bin_attribute
*attr
;
1185 /* If the device has VPD, try to expose it in sysfs. */
1187 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1191 sysfs_bin_attr_init(attr
);
1192 attr
->size
= dev
->vpd
->len
;
1193 attr
->attr
.name
= "vpd";
1194 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1195 attr
->read
= read_vpd_attr
;
1196 attr
->write
= write_vpd_attr
;
1197 retval
= sysfs_create_bin_file(&dev
->dev
.kobj
, attr
);
1202 dev
->vpd
->attr
= attr
;
1205 /* Active State Power Management */
1206 pcie_aspm_create_sysfs_dev_files(dev
);
1208 if (!pci_probe_reset_function(dev
)) {
1209 retval
= device_create_file(&dev
->dev
, &reset_attr
);
1217 pcie_aspm_remove_sysfs_dev_files(dev
);
1218 if (dev
->vpd
&& dev
->vpd
->attr
) {
1219 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1220 kfree(dev
->vpd
->attr
);
1226 int __must_check
pci_create_sysfs_dev_files (struct pci_dev
*pdev
)
1230 struct bin_attribute
*attr
;
1232 if (!sysfs_initialized
)
1235 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1236 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1238 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1242 retval
= pci_create_resource_files(pdev
);
1244 goto err_config_file
;
1246 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1247 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1248 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1251 /* If the device has a ROM, try to expose it in sysfs. */
1253 attr
= kzalloc(sizeof(*attr
), GFP_ATOMIC
);
1256 goto err_resource_files
;
1258 sysfs_bin_attr_init(attr
);
1259 attr
->size
= rom_size
;
1260 attr
->attr
.name
= "rom";
1261 attr
->attr
.mode
= S_IRUSR
| S_IWUSR
;
1262 attr
->read
= pci_read_rom
;
1263 attr
->write
= pci_write_rom
;
1264 retval
= sysfs_create_bin_file(&pdev
->dev
.kobj
, attr
);
1267 goto err_resource_files
;
1269 pdev
->rom_attr
= attr
;
1272 if ((pdev
->class >> 8) == PCI_CLASS_DISPLAY_VGA
) {
1273 retval
= device_create_file(&pdev
->dev
, &vga_attr
);
1278 /* add platform-specific attributes */
1279 retval
= pcibios_add_platform_entries(pdev
);
1283 /* add sysfs entries for various capabilities */
1284 retval
= pci_create_capabilities_sysfs(pdev
);
1288 pci_create_firmware_label_files(pdev
);
1293 if ((pdev
->class >> 8) == PCI_CLASS_DISPLAY_VGA
)
1294 device_remove_file(&pdev
->dev
, &vga_attr
);
1297 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1298 kfree(pdev
->rom_attr
);
1299 pdev
->rom_attr
= NULL
;
1302 pci_remove_resource_files(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
);
1312 static void pci_remove_capabilities_sysfs(struct pci_dev
*dev
)
1314 if (dev
->vpd
&& dev
->vpd
->attr
) {
1315 sysfs_remove_bin_file(&dev
->dev
.kobj
, dev
->vpd
->attr
);
1316 kfree(dev
->vpd
->attr
);
1319 pcie_aspm_remove_sysfs_dev_files(dev
);
1320 if (dev
->reset_fn
) {
1321 device_remove_file(&dev
->dev
, &reset_attr
);
1327 * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
1328 * @pdev: device whose entries we should free
1330 * Cleanup when @pdev is removed from sysfs.
1332 void pci_remove_sysfs_dev_files(struct pci_dev
*pdev
)
1336 if (!sysfs_initialized
)
1339 pci_remove_capabilities_sysfs(pdev
);
1341 if (pdev
->cfg_size
< PCI_CFG_SPACE_EXP_SIZE
)
1342 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pci_config_attr
);
1344 sysfs_remove_bin_file(&pdev
->dev
.kobj
, &pcie_config_attr
);
1346 pci_remove_resource_files(pdev
);
1348 if (pci_resource_len(pdev
, PCI_ROM_RESOURCE
))
1349 rom_size
= pci_resource_len(pdev
, PCI_ROM_RESOURCE
);
1350 else if (pdev
->resource
[PCI_ROM_RESOURCE
].flags
& IORESOURCE_ROM_SHADOW
)
1353 if (rom_size
&& pdev
->rom_attr
) {
1354 sysfs_remove_bin_file(&pdev
->dev
.kobj
, pdev
->rom_attr
);
1355 kfree(pdev
->rom_attr
);
1358 pci_remove_firmware_label_files(pdev
);
1362 static int __init
pci_sysfs_init(void)
1364 struct pci_dev
*pdev
= NULL
;
1367 sysfs_initialized
= 1;
1368 for_each_pci_dev(pdev
) {
1369 retval
= pci_create_sysfs_dev_files(pdev
);
1379 late_initcall(pci_sysfs_init
);