linux-kernel - Re: [PATCH] Intel Management Engine Interface

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Date:	Wed, 13 Aug 2008 08:16:02 +0100
From:	"Marcin Obara" <marcin_obara@...rs.sourceforge.net>
To:	"Greg KH" <greg@...ah.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Intel Management Engine Interface

2008/8/13 Greg KH <greg@...ah.com>:
> On Mon, Aug 11, 2008 at 09:23:01PM +0200, Marcin Obara wrote:
>> +/* IOCTL commands */
>> +#define IOCTL_HECI_GET_VERSION \
>> +    _IOWR('H' , 0x0, struct heci_message_data)
>
> This can easily be a sysfs file, why not do that instead?
>
sysfs file would require additional file handle used by every userspace client.
GET_VERSION is called frequently, and sysfs file would create extra overhead.
With ioctl - only one file handle is used, and userspace client logic
is simpler.
Normal flow looks like:

open
ioctl(GET_VERSION)
ioctl(CONNECT)
... - do some operations - depends on version
close

or:

open
ioctl(CONNECT)
.. - do some operations
close


-- 
Marcin
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