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32 .Nd generic PCI driver
38 driver provides a way for userland programs to read and write
40 configuration registers.
41 It also provides a way for userland programs to get a list of all
45 devices that match various patterns.
49 driver provides a write interface for
51 configuration registers, system administrators should exercise caution when
52 granting access to the
55 If used improperly, this driver can allow userland applications to
56 crash a machine or cause data loss.
63 It enumerates any devices on the
67 client drivers the chance to attach to them.
68 It assigns resources to children, when the BIOS does not.
69 It takes care of routing interrupts when necessary.
70 It reprobes the unattached
74 client drivers are dynamically
76 .Sh KERNEL CONFIGURATION
79 device is included in the kernel as described in the SYNOPSIS section.
82 driver cannot be built as a
87 calls are supported by the
90 They are defined in the header file
92 .Bl -tag -width 012345678901234
99 It allows the user to retrieve information on all
101 devices in the system, or on
103 devices matching patterns supplied by the user.
106 to any value specified in either
112 structure consists of a number of fields:
113 .Bl -tag -width match_buf_len
115 The length, in bytes, of the buffer filled with user-supplied patterns.
117 The number of user-supplied patterns.
119 Pointer to a buffer filled with user-supplied patterns.
127 structure consists of the following elements:
128 .Bl -tag -width pd_vendor
131 domain, bus, slot and function.
137 device driver unit number.
148 The flags describe which of the fields the kernel should match against.
149 A device must match all specified fields in order to be returned.
150 The match flags are enumerated in the
151 .Va pci_getconf_flags
153 Hopefully the flag values are obvious enough that they do not need to
159 buffer allocated by the user to hold the results of the
163 Number of matches returned by the kernel.
165 Buffer containing matching devices returned by the kernel.
166 The items in this buffer are of type
168 which consists of the following items:
169 .Bl -tag -width pc_subvendor
172 domain, bus, slot and function.
196 device programming interface.
206 The offset is passed in by the user to tell the kernel where it should
207 start traversing the device list.
208 The value passed out by the kernel
209 points to the record immediately after the last one returned.
211 pass the value returned by the kernel in subsequent calls to the
214 If the user does not intend to use the offset, it must be set to zero.
217 configuration generation.
218 This value only needs to be set if the offset is set.
219 The kernel will compare the current generation number of its internal
220 device list to the generation passed in by the user to determine whether
221 its device list has changed since the user last called the
224 If the device list has changed, a status of
225 .Va PCI_GETCONF_LIST_CHANGED
228 The status tells the user the disposition of his request for a device list.
229 The possible status values are:
231 .It PCI_GETCONF_LAST_DEVICE
232 This means that there are no more devices in the PCI device list after the
236 .It PCI_GETCONF_LIST_CHANGED
237 This status tells the user that the
239 device list has changed since his last call to the
241 ioctl and he must reset the
245 to zero to start over at the beginning of the list.
246 .It PCI_GETCONF_MORE_DEVS
247 This tells the user that his buffer was not large enough to hold all of the
248 remaining devices in the device list that possibly match his criteria.
249 It is possible for this status to be returned, even when none of the remaining
250 devices in the list would match the user's criteria.
251 .It PCI_GETCONF_ERROR
252 This indicates a general error while servicing the user's request.
258 .Fn sizeof "struct pci_match_conf" ,
269 configuration registers specified by the passed-in
274 structure consists of the following fields:
275 .Bl -tag -width pi_width
279 structure which specifies the domain, bus, slot and function the user would
281 If the specific bus is not found, errno will be set to ENODEV and -1 returned
286 configuration register the user would like to access.
288 The width, in bytes, of the data the user would like to read.
290 may be either 1, 2, or 4.
291 3-byte reads and reads larger than 4 bytes are
293 If an invalid width is passed, errno will be set to EINVAL.
295 The data returned by the kernel.
300 allows users to write to the
302 specified in the passed-in
307 structure is described above.
308 The limitations on data width described for
309 reading registers, above, also apply to writing
311 configuration registers.
314 .Bl -tag -width /dev/pci -compact
316 Character device for the
325 driver (not the kernel's
327 support code) first appeared in
329 and was written by Stefan Esser and Garrett Wollman.
330 Support for device listing and matching was re-implemented by
331 Kenneth Merry, and first appeared in
334 .An Kenneth Merry Aq ken@FreeBSD.org
336 It is not possible for users to specify an accurate offset into the device
337 list without calling the
339 at least once, since they have no way of knowing the current generation
341 This probably is not a serious problem, though, since
342 users can easily narrow their search by specifying a pattern or patterns
343 for the kernel to match against.