* udev & modalias files
@ 2016-06-03 16:32 Muni Sekhar
2016-06-03 18:48 ` Greg KH
2016-06-03 18:50 ` Bjørn Mork
0 siblings, 2 replies; 4+ messages in thread
From: Muni Sekhar @ 2016-06-03 16:32 UTC (permalink / raw)
To: kernelnewbies
Hi,
I see lot of modalias files under /sys directory.
For e.g:
# cat /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/modalias
pci:v00001556d00005555sv00004000sd00000000bc08sc05i01
I would like to know which part of the kernel module creates sysfs
modalias file?
How does udev load modules dynamically when a new device is added?
Where should I look for default udev rules?
--
Thanks,
Sekhar
^ permalink raw reply [flat|nested] 4+ messages in thread
* udev & modalias files
2016-06-03 16:32 udev & modalias files Muni Sekhar
@ 2016-06-03 18:48 ` Greg KH
2016-06-03 18:50 ` Bjørn Mork
1 sibling, 0 replies; 4+ messages in thread
From: Greg KH @ 2016-06-03 18:48 UTC (permalink / raw)
To: kernelnewbies
On Fri, Jun 03, 2016 at 10:02:02PM +0530, Muni Sekhar wrote:
> Hi,
>
> I see lot of modalias files under /sys directory.
>
> For e.g:
>
> # cat /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/modalias
>
> pci:v00001556d00005555sv00004000sd00000000bc08sc05i01
>
>
>
> I would like to know which part of the kernel module creates sysfs
> modalias file?
The kernel bus code for the device that the bus is on creates this. For
this example, the PCI bus code does this work.
> How does udev load modules dynamically when a new device is added?
The book, "Linux Device Drivers, version 3", free online, has a whole
section on this, I suggest reading it.
> Where should I look for default udev rules?
In the udev or systemd package on your machine. Specific ways to do
this depends on your distro.
greg k-h
^ permalink raw reply [flat|nested] 4+ messages in thread
* udev & modalias files
2016-06-03 16:32 udev & modalias files Muni Sekhar
2016-06-03 18:48 ` Greg KH
@ 2016-06-03 18:50 ` Bjørn Mork
2016-06-04 13:32 ` Muni Sekhar
1 sibling, 1 reply; 4+ messages in thread
From: Bjørn Mork @ 2016-06-03 18:50 UTC (permalink / raw)
To: kernelnewbies
Muni Sekhar <munisekharrms@gmail.com> writes:
> I see lot of modalias files under /sys directory.
>
> For e.g:
>
> # cat /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/modalias
>
> pci:v00001556d00005555sv00004000sd00000000bc08sc05i01
>
>
>
> I would like to know which part of the kernel module creates sysfs
> modalias file?
lots of different places. Do a "git grep modalias drivers/" to see many
of them. That particular file is created by drivers/pci/pci-sysfs.c
Bj?rn
^ permalink raw reply [flat|nested] 4+ messages in thread
* udev & modalias files
2016-06-03 18:50 ` Bjørn Mork
@ 2016-06-04 13:32 ` Muni Sekhar
0 siblings, 0 replies; 4+ messages in thread
From: Muni Sekhar @ 2016-06-04 13:32 UTC (permalink / raw)
To: kernelnewbies
On Sat, Jun 4, 2016 at 12:20 AM, Bj?rn Mork <bjorn@mork.no> wrote:
> Muni Sekhar <munisekharrms@gmail.com> writes:
>
>> I see lot of modalias files under /sys directory.
>>
>> For e.g:
>>
>> # cat /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/modalias
>>
>> pci:v00001556d00005555sv00004000sd00000000bc08sc05i01
>>
>>
>>
>> I would like to know which part of the kernel module creates sysfs
>> modalias file?
>
> lots of different places. Do a "git grep modalias drivers/" to see many
> of them. That particular file is created by drivers/pci/pci-sysfs.c
>
>
>
> Bj?rn
Thanks Greg & Bj?rn.
--
Thanks,
Sekhar
^ permalink raw reply [flat|nested] 4+ messages in thread
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2016-06-03 16:32 udev & modalias files Muni Sekhar
2016-06-03 18:48 ` Greg KH
2016-06-03 18:50 ` Bjørn Mork
2016-06-04 13:32 ` Muni Sekhar
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