From: Jesse Barnes <jbarnes@virtuousgeek.org>
To: Ben Hutchings <bhutchings@solarflare.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
ppc-dev <linuxppc-dev@lists.ozlabs.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-pci <linux-pci@vger.kernel.org>
Subject: Re: [PATCH] PCI: MSI: Restore read_msi_msg_desc(); add get_cached_msi_msg_desc()
Date: Fri, 30 Jul 2010 09:42:47 -0700 [thread overview]
Message-ID: <20100730094247.05cb070e@virtuousgeek.org> (raw)
In-Reply-To: <1279893388.2089.9.camel@achroite.uk.solarflarecom.com>
On Fri, 23 Jul 2010 14:56:28 +0100
Ben Hutchings <bhutchings@solarflare.com> wrote:
> commit 2ca1af9aa3285c6a5f103ed31ad09f7399fc65d7 "PCI: MSI: Remove
> unsafe and unnecessary hardware access" changed read_msi_msg_desc() to
> return the last MSI message written instead of reading it from the
> device, since it may be called while the device is in a reduced
> power state.
>
> However, the pSeries platform code really does need to read messages
> from the device, since they are initially written by firmware.
> Therefore:
> - Restore the previous behaviour of read_msi_msg_desc()
> - Add new functions get_cached_msi_msg{,_desc}() which return the
> last MSI message written
> - Use the new functions where appropriate
>
> Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
> ---
> Compile-tested only.
>
Applied to linux-next with Michael's ack, thanks. I hope it actually
works, I didn't see a tested-by!
--
Jesse Barnes, Intel Open Source Technology Center
WARNING: multiple messages have this Message-ID (diff)
From: Jesse Barnes <jbarnes@virtuousgeek.org>
To: Ben Hutchings <bhutchings@solarflare.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
ppc-dev <linuxppc-dev@lists.ozlabs.org>,
LKML <linux-kernel@vger.kernel.org>,
Michael Ellerman <michael@ellerman.id.au>,
linux-pci <linux-pci@vger.kernel.org>
Subject: Re: [PATCH] PCI: MSI: Restore read_msi_msg_desc(); add get_cached_msi_msg_desc()
Date: Fri, 30 Jul 2010 09:42:47 -0700 [thread overview]
Message-ID: <20100730094247.05cb070e@virtuousgeek.org> (raw)
In-Reply-To: <1279893388.2089.9.camel@achroite.uk.solarflarecom.com>
On Fri, 23 Jul 2010 14:56:28 +0100
Ben Hutchings <bhutchings@solarflare.com> wrote:
> commit 2ca1af9aa3285c6a5f103ed31ad09f7399fc65d7 "PCI: MSI: Remove
> unsafe and unnecessary hardware access" changed read_msi_msg_desc() to
> return the last MSI message written instead of reading it from the
> device, since it may be called while the device is in a reduced
> power state.
>
> However, the pSeries platform code really does need to read messages
> from the device, since they are initially written by firmware.
> Therefore:
> - Restore the previous behaviour of read_msi_msg_desc()
> - Add new functions get_cached_msi_msg{,_desc}() which return the
> last MSI message written
> - Use the new functions where appropriate
>
> Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
> ---
> Compile-tested only.
>
Applied to linux-next with Michael's ack, thanks. I hope it actually
works, I didn't see a tested-by!
--
Jesse Barnes, Intel Open Source Technology Center
next prev parent reply other threads:[~2010-07-30 16:42 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-23 0:22 linux-next: OOPS at bot time Stephen Rothwell
2010-07-23 0:22 ` Stephen Rothwell
2010-07-23 1:19 ` Ben Hutchings
2010-07-23 2:05 ` Michael Ellerman
2010-07-23 13:56 ` [PATCH] PCI: MSI: Restore read_msi_msg_desc(); add get_cached_msi_msg_desc() Ben Hutchings
2010-07-23 13:56 ` Ben Hutchings
2010-07-26 11:20 ` Michael Ellerman
2010-07-26 11:20 ` Michael Ellerman
2010-07-30 16:42 ` Jesse Barnes [this message]
2010-07-30 16:42 ` Jesse Barnes
2010-08-01 6:23 ` Michael Ellerman
2012-11-20 7:20 ` Benjamin Herrenschmidt
2012-11-20 7:20 ` Benjamin Herrenschmidt
2012-11-20 12:36 ` Ben Hutchings
2012-11-20 12:36 ` Ben Hutchings
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