netdev - Re: [PATCH] Read back MSI message in rtas_setup_msi

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Message-ID: <20071107212949.GI4239@austin.ibm.com>
Date:	Wed, 7 Nov 2007 15:29:49 -0600
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Michael Ellerman <michael@...erman.id.au>
Cc:	Paul Mackerras <paulus@...ba.org>, linuxppc-dev@...abs.org,
	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	mchan@...adcom.com, mcarlson@...adcom.com,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH] Read back MSI message in rtas_setup_msi_irqs() so restore works

On Tue, Oct 23, 2007 at 02:23:44PM +1000, Michael Ellerman wrote:
> There are plans afoot to use pci_restore_msi_state() to restore MSI
> state after a device reset. In order for this to work for the RTAS MSI
> backend, we need to read back the MSI message from config space after
> it has been setup by firmware.
> 
> This should be sufficient for restoring the MSI state after a device
> reset, however we will need to revisit this for suspend to disk if that
> is ever implemented on pseries.
> 
> Signed-off-by: Michael Ellerman <michael@...erman.id.au>
> ---
> 
> Linas, can you test this on your setup with your EEH stuff? I haven't got
> any MSI supporting hardware/firmware combination.

Acked-by: Linas Vepstas <linas@...tin.ibm.com>

I *finally* was able to get onto some hardware long enough to run this.
And that took a lot of work. Sigh. Yes, this is exactly what I'd wanted.

--linas
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