From: Rajesh Shah <rajesh.shah@intel.com>
To: Davide Rossetti <davide.rossetti@roma1.infn.it>
Cc: linux-kernel@vger.kernel.org
Subject: Re: MSI to memory?
Date: Wed, 7 Jul 2004 10:13:25 -0700 [thread overview]
Message-ID: <20040707101324.A30488@unix-os.sc.intel.com> (raw)
In-Reply-To: <40EBED33.3050707@roma1.infn.it>; from davide.rossetti@roma1.infn.it on Wed, Jul 07, 2004 at 02:31:47PM +0200
On Wed, Jul 07, 2004 at 02:31:47PM +0200, Davide Rossetti wrote:
> Rajesh Shah wrote:
>
> > What type of usage model did you have in mind to have the
> >
> >device write to memory instead of using MSI for interrupts?
> >
> >
> for instance for a fast wake-up trick. the driver loops on a memory
> location until the MSI write access changes the memory content...
>
But you don't need to use MSI address/data pair for this. Devices
can do "regular" memory writes to indicate command completion etc.
into driver allocated memory.
Rajesh
next prev parent reply other threads:[~2004-07-07 17:16 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-01 18:15 MSI to memory? Bjorn Helgaas
2004-07-01 18:53 ` Rajesh Shah
2004-07-02 15:51 ` Bjorn Helgaas
2004-07-07 12:31 ` Davide Rossetti
2004-07-07 12:45 ` Helge Hafting
2004-07-07 16:59 ` Roland Dreier
2004-07-08 9:03 ` Helge Hafting
2004-07-07 17:04 ` Zwane Mwaikambo
2004-07-07 13:15 ` Richard B. Johnson
2004-07-07 17:13 ` Rajesh Shah [this message]
2004-07-02 16:04 ` Roland Dreier
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