2 * Procfs interface for the PCI bus.
4 * Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
7 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <linux/module.h>
11 #include <linux/proc_fs.h>
12 #include <linux/seq_file.h>
13 #include <linux/smp_lock.h>
14 #include <linux/capability.h>
15 #include <asm/uaccess.h>
16 #include <asm/byteorder.h>
19 static int proc_initialized
; /* = 0 */
22 proc_bus_pci_lseek(struct file
*file
, loff_t off
, int whence
)
25 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
27 mutex_lock(&inode
->i_mutex
);
33 new = file
->f_pos
+ off
;
36 new = inode
->i_size
+ off
;
39 if (new < 0 || new > inode
->i_size
)
43 mutex_unlock(&inode
->i_mutex
);
48 proc_bus_pci_read(struct file
*file
, char __user
*buf
, size_t nbytes
, loff_t
*ppos
)
50 const struct inode
*ino
= file
->f_path
.dentry
->d_inode
;
51 const struct proc_dir_entry
*dp
= PDE(ino
);
52 struct pci_dev
*dev
= dp
->data
;
53 unsigned int pos
= *ppos
;
54 unsigned int cnt
, size
;
57 * Normal users can read only the standardized portion of the
58 * configuration space as several chips lock up when trying to read
59 * undefined locations (think of Intel PIIX4 as a typical example).
62 if (capable(CAP_SYS_ADMIN
))
64 else if (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
)
73 if (pos
+ nbytes
> size
)
77 if (!access_ok(VERIFY_WRITE
, buf
, cnt
))
80 if ((pos
& 1) && cnt
) {
82 pci_user_read_config_byte(dev
, pos
, &val
);
89 if ((pos
& 3) && cnt
> 2) {
91 pci_user_read_config_word(dev
, pos
, &val
);
92 __put_user(cpu_to_le16(val
), (__le16 __user
*) buf
);
100 pci_user_read_config_dword(dev
, pos
, &val
);
101 __put_user(cpu_to_le32(val
), (__le32 __user
*) buf
);
109 pci_user_read_config_word(dev
, pos
, &val
);
110 __put_user(cpu_to_le16(val
), (__le16 __user
*) buf
);
118 pci_user_read_config_byte(dev
, pos
, &val
);
119 __put_user(val
, buf
);
130 proc_bus_pci_write(struct file
*file
, const char __user
*buf
, size_t nbytes
, loff_t
*ppos
)
132 struct inode
*ino
= file
->f_path
.dentry
->d_inode
;
133 const struct proc_dir_entry
*dp
= PDE(ino
);
134 struct pci_dev
*dev
= dp
->data
;
143 if (pos
+ nbytes
> size
)
147 if (!access_ok(VERIFY_READ
, buf
, cnt
))
150 if ((pos
& 1) && cnt
) {
152 __get_user(val
, buf
);
153 pci_user_write_config_byte(dev
, pos
, val
);
159 if ((pos
& 3) && cnt
> 2) {
161 __get_user(val
, (__le16 __user
*) buf
);
162 pci_user_write_config_word(dev
, pos
, le16_to_cpu(val
));
170 __get_user(val
, (__le32 __user
*) buf
);
171 pci_user_write_config_dword(dev
, pos
, le32_to_cpu(val
));
179 __get_user(val
, (__le16 __user
*) buf
);
180 pci_user_write_config_word(dev
, pos
, le16_to_cpu(val
));
188 __get_user(val
, buf
);
189 pci_user_write_config_byte(dev
, pos
, val
);
196 i_size_write(ino
, dp
->size
);
200 struct pci_filp_private
{
201 enum pci_mmap_state mmap_state
;
205 static long proc_bus_pci_ioctl(struct file
*file
, unsigned int cmd
,
208 const struct proc_dir_entry
*dp
= PDE(file
->f_dentry
->d_inode
);
209 struct pci_dev
*dev
= dp
->data
;
211 struct pci_filp_private
*fpriv
= file
->private_data
;
212 #endif /* HAVE_PCI_MMAP */
216 case PCIIOC_CONTROLLER
:
217 ret
= pci_domain_nr(dev
->bus
);
221 case PCIIOC_MMAP_IS_IO
:
222 fpriv
->mmap_state
= pci_mmap_io
;
225 case PCIIOC_MMAP_IS_MEM
:
226 fpriv
->mmap_state
= pci_mmap_mem
;
229 case PCIIOC_WRITE_COMBINE
:
231 fpriv
->write_combine
= 1;
233 fpriv
->write_combine
= 0;
236 #endif /* HAVE_PCI_MMAP */
247 static int proc_bus_pci_mmap(struct file
*file
, struct vm_area_struct
*vma
)
249 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
250 const struct proc_dir_entry
*dp
= PDE(inode
);
251 struct pci_dev
*dev
= dp
->data
;
252 struct pci_filp_private
*fpriv
= file
->private_data
;
255 if (!capable(CAP_SYS_RAWIO
))
258 /* Make sure the caller is mapping a real resource for this device */
259 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
260 if (pci_mmap_fits(dev
, i
, vma
))
264 if (i
>= PCI_ROM_RESOURCE
)
267 ret
= pci_mmap_page_range(dev
, vma
,
269 fpriv
->write_combine
);
276 static int proc_bus_pci_open(struct inode
*inode
, struct file
*file
)
278 struct pci_filp_private
*fpriv
= kmalloc(sizeof(*fpriv
), GFP_KERNEL
);
283 fpriv
->mmap_state
= pci_mmap_io
;
284 fpriv
->write_combine
= 0;
286 file
->private_data
= fpriv
;
291 static int proc_bus_pci_release(struct inode
*inode
, struct file
*file
)
293 kfree(file
->private_data
);
294 file
->private_data
= NULL
;
298 #endif /* HAVE_PCI_MMAP */
300 static const struct file_operations proc_bus_pci_operations
= {
301 .owner
= THIS_MODULE
,
302 .llseek
= proc_bus_pci_lseek
,
303 .read
= proc_bus_pci_read
,
304 .write
= proc_bus_pci_write
,
305 .unlocked_ioctl
= proc_bus_pci_ioctl
,
306 .compat_ioctl
= proc_bus_pci_ioctl
,
308 .open
= proc_bus_pci_open
,
309 .release
= proc_bus_pci_release
,
310 .mmap
= proc_bus_pci_mmap
,
311 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
312 .get_unmapped_area
= get_pci_unmapped_area
,
313 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
314 #endif /* HAVE_PCI_MMAP */
318 static void *pci_seq_start(struct seq_file
*m
, loff_t
*pos
)
320 struct pci_dev
*dev
= NULL
;
323 for_each_pci_dev(dev
) {
330 static void *pci_seq_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
332 struct pci_dev
*dev
= v
;
335 dev
= pci_get_device(PCI_ANY_ID
, PCI_ANY_ID
, dev
);
339 static void pci_seq_stop(struct seq_file
*m
, void *v
)
342 struct pci_dev
*dev
= v
;
347 static int show_device(struct seq_file
*m
, void *v
)
349 const struct pci_dev
*dev
= v
;
350 const struct pci_driver
*drv
;
356 drv
= pci_dev_driver(dev
);
357 seq_printf(m
, "%02x%02x\t%04x%04x\t%x",
364 /* only print standard and ROM resources to preserve compatibility */
365 for (i
= 0; i
<= PCI_ROM_RESOURCE
; i
++) {
366 resource_size_t start
, end
;
367 pci_resource_to_user(dev
, i
, &dev
->resource
[i
], &start
, &end
);
368 seq_printf(m
, "\t%16llx",
369 (unsigned long long)(start
|
370 (dev
->resource
[i
].flags
& PCI_REGION_FLAG_MASK
)));
372 for (i
= 0; i
<= PCI_ROM_RESOURCE
; i
++) {
373 resource_size_t start
, end
;
374 pci_resource_to_user(dev
, i
, &dev
->resource
[i
], &start
, &end
);
375 seq_printf(m
, "\t%16llx",
376 dev
->resource
[i
].start
< dev
->resource
[i
].end
?
377 (unsigned long long)(end
- start
) + 1 : 0);
381 seq_printf(m
, "%s", drv
->name
);
386 static const struct seq_operations proc_bus_pci_devices_op
= {
387 .start
= pci_seq_start
,
388 .next
= pci_seq_next
,
389 .stop
= pci_seq_stop
,
393 static struct proc_dir_entry
*proc_bus_pci_dir
;
395 int pci_proc_attach_device(struct pci_dev
*dev
)
397 struct pci_bus
*bus
= dev
->bus
;
398 struct proc_dir_entry
*e
;
401 if (!proc_initialized
)
405 if (pci_proc_domain(bus
)) {
406 sprintf(name
, "%04x:%02x", pci_domain_nr(bus
),
409 sprintf(name
, "%02x", bus
->number
);
411 bus
->procdir
= proc_mkdir(name
, proc_bus_pci_dir
);
416 sprintf(name
, "%02x.%x", PCI_SLOT(dev
->devfn
), PCI_FUNC(dev
->devfn
));
417 e
= proc_create_data(name
, S_IFREG
| S_IRUGO
| S_IWUSR
, bus
->procdir
,
418 &proc_bus_pci_operations
, dev
);
421 e
->size
= dev
->cfg_size
;
427 int pci_proc_detach_device(struct pci_dev
*dev
)
429 struct proc_dir_entry
*e
;
431 if ((e
= dev
->procent
)) {
432 remove_proc_entry(e
->name
, dev
->bus
->procdir
);
439 int pci_proc_attach_bus(struct pci_bus
* bus
)
441 struct proc_dir_entry
*de
= bus
->procdir
;
443 if (!proc_initialized
)
448 sprintf(name
, "%02x", bus
->number
);
449 de
= bus
->procdir
= proc_mkdir(name
, proc_bus_pci_dir
);
457 int pci_proc_detach_bus(struct pci_bus
* bus
)
459 struct proc_dir_entry
*de
= bus
->procdir
;
461 remove_proc_entry(de
->name
, proc_bus_pci_dir
);
465 static int proc_bus_pci_dev_open(struct inode
*inode
, struct file
*file
)
467 return seq_open(file
, &proc_bus_pci_devices_op
);
469 static const struct file_operations proc_bus_pci_dev_operations
= {
470 .owner
= THIS_MODULE
,
471 .open
= proc_bus_pci_dev_open
,
474 .release
= seq_release
,
477 static int __init
pci_proc_init(void)
479 struct pci_dev
*dev
= NULL
;
480 proc_bus_pci_dir
= proc_mkdir("bus/pci", NULL
);
481 proc_create("devices", 0, proc_bus_pci_dir
,
482 &proc_bus_pci_dev_operations
);
483 proc_initialized
= 1;
484 for_each_pci_dev(dev
)
485 pci_proc_attach_device(dev
);
490 device_initcall(pci_proc_init
);