linux-kernel - Re: CoreSight framework and drivers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20121223113239.GG16237@mudshark.cambridge.arm.com>
Date:	Sun, 23 Dec 2012 11:32:39 +0000
From:	Will Deacon <will.deacon@....com>
To:	Pratik Patel <pratikp@...eaurora.org>
Cc:	Jon Hunter <jon-hunter@...com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"magnus.p.persson@...ricsson.com" <magnus.p.persson@...ricsson.com>,
	"david.rusling@...aro.org" <david.rusling@...aro.org>,
	"arve@...roid.com" <arve@...roid.com>,
	"dsaxena@...aro.org" <dsaxena@...aro.org>,
	"john.stultz@...aro.org" <john.stultz@...aro.org>,
	"d-deao@...com" <d-deao@...com>,
	"christian.bejram@...ricsson.com" <christian.bejram@...ricsson.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: CoreSight framework and drivers

On Fri, Dec 21, 2012 at 10:18:28PM +0000, Pratik Patel wrote:
> What user interface do you plan to provide for the CTI? Maybe
> something consistent with other CoreSight components in sysfs to
> allow users to enable, disable, map and unmap ???
> 
> Please let me know your thoughts.

Rather than have your current approach of dev nodes + sysfs config files for
each coresight device, I think it might be better to follow something closer
to ftrace and stick per-device directories under debugfs/coresight/. Then you
can have a pipe file and some config files in the same directory for each
component. You also don't need to do any mapping operations with this (just
post-process the stream directly).

It might also be fun to play with file redirection for sources and sinks, but
that's probably a bit too invasive.

Will
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/