Date: Thu, 3 Nov 2011 21:11:58 -0700 From: John-Mark Gurney <jmg@funkthat.com> To: Adarsh Joshi <adarsh.joshi@qlogic.com> Cc: "freebsd-drivers@freebsd.org" <freebsd-drivers@freebsd.org> Subject: Re: Is it possible to change the log level of a device driver at runtime? Message-ID: <20111104041157.GG25601@funkthat.com> In-Reply-To: <5E4F49720D0BAD499EE1F01232234BA873C6F1A540@AVEXMB1.qlogic.org> References: <5E4F49720D0BAD499EE1F01232234BA873C6F1A523@AVEXMB1.qlogic.org> <20111103183637.GD25601@funkthat.com> <5E4F49720D0BAD499EE1F01232234BA873C6F1A540@AVEXMB1.qlogic.org>
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Adarsh Joshi wrote this message on Thu, Nov 03, 2011 at 11:42 -0700:
> The driver is not yet in the tree.
>
> I am trying to implement the change of debug level at run time. Can you kindly explain how do I do it? ( by setting the sysctl as you mentioned)
There are two different ways... If you want it to apply to all
instances of your driver, take a look at the SYSCTL(9) manpage...
You'll probably want to use SYSCTL_INT...
If you want it to be on a per device basis, you can use
device_get_sysctl_ctx to get the sysctl context for your driver, and
use SYSCTL_ADD_xxx w/ that context...
If you need to have it set at boot time, include a TUNABLE_INT...
Hope this helps! And take a look at how other drivers do it... A
driver like sys/dev/e1000/if_em.c has some good examples...
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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