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From: Joerg Roedel <joerg.roedel@amd.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: <linux-pci@vger.kernel.org>, <iommu@lists.linux-foundation.org>,
	<dwmw2@infradead.org>, <linux-kernel@vger.kernel.org>,
	<dsahern@gmail.com>
Subject: Re: [PATCH 0/2] Fix ACS path checking
Date: Mon, 6 Aug 2012 14:20:53 +0200	[thread overview]
Message-ID: <20120806122053.GL1996@amd.com> (raw)
In-Reply-To: <20120806105010.GK1996@amd.com>

On Mon, Aug 06, 2012 at 12:50:10PM +0200, Joerg Roedel wrote:
> On Sat, Aug 04, 2012 at 12:08:46PM -0600, Alex Williamson wrote:
> Hmm, tried it here, At least pci_request_acs() still gets called. How do
> you detect if ACS is really enabled?

Okay, I found a problem. pci_request_acs needs to be called before PCI
probing. Does the attached patch help?

>From 87a4363be30d5d015a984a60769f29b0607fc5fb Mon Sep 17 00:00:00 2001
From: Joerg Roedel <joerg.roedel@amd.com>
Date: Mon, 6 Aug 2012 14:18:42 +0200
Subject: [PATCH] iommu/amd: Fix pci_request_acs() call-place

The pci_request_acs() function needs to be called before PCI
probing to be effective. So move it to another call-place to
ensure that.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
 drivers/iommu/amd_iommu_init.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 500e7f1..0a2ea31 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1131,9 +1131,6 @@ static int __init amd_iommu_init_pci(void)
 			break;
 	}
 
-	/* Make sure ACS will be enabled */
-	pci_request_acs();
-
 	ret = amd_iommu_init_devices();
 
 	print_iommu_info();
@@ -1652,6 +1649,9 @@ static bool detect_ivrs(void)
 
 	early_acpi_os_unmap_memory((char __iomem *)ivrs_base, ivrs_size);
 
+	/* Make sure ACS will be enabled during PCI probe */
+	pci_request_acs();
+
 	return true;
 }
 
-- 
1.7.9.5



WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <joerg.roedel-5C7GfCeVMHo@public.gmane.org>
To: Alex Williamson
	<alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
	dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	dsahern-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Subject: Re: [PATCH 0/2] Fix ACS path checking
Date: Mon, 6 Aug 2012 14:20:53 +0200	[thread overview]
Message-ID: <20120806122053.GL1996@amd.com> (raw)
In-Reply-To: <20120806105010.GK1996-5C7GfCeVMHo@public.gmane.org>

On Mon, Aug 06, 2012 at 12:50:10PM +0200, Joerg Roedel wrote:
> On Sat, Aug 04, 2012 at 12:08:46PM -0600, Alex Williamson wrote:
> Hmm, tried it here, At least pci_request_acs() still gets called. How do
> you detect if ACS is really enabled?

Okay, I found a problem. pci_request_acs needs to be called before PCI
probing. Does the attached patch help?

>From 87a4363be30d5d015a984a60769f29b0607fc5fb Mon Sep 17 00:00:00 2001
From: Joerg Roedel <joerg.roedel-5C7GfCeVMHo@public.gmane.org>
Date: Mon, 6 Aug 2012 14:18:42 +0200
Subject: [PATCH] iommu/amd: Fix pci_request_acs() call-place

The pci_request_acs() function needs to be called before PCI
probing to be effective. So move it to another call-place to
ensure that.

Signed-off-by: Joerg Roedel <joerg.roedel-5C7GfCeVMHo@public.gmane.org>
---
 drivers/iommu/amd_iommu_init.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 500e7f1..0a2ea31 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1131,9 +1131,6 @@ static int __init amd_iommu_init_pci(void)
 			break;
 	}
 
-	/* Make sure ACS will be enabled */
-	pci_request_acs();
-
 	ret = amd_iommu_init_devices();
 
 	print_iommu_info();
@@ -1652,6 +1649,9 @@ static bool detect_ivrs(void)
 
 	early_acpi_os_unmap_memory((char __iomem *)ivrs_base, ivrs_size);
 
+	/* Make sure ACS will be enabled during PCI probe */
+	pci_request_acs();
+
 	return true;
 }
 
-- 
1.7.9.5

  reply	other threads:[~2012-08-06 12:20 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-04 18:08 [PATCH 0/2] Fix ACS path checking Alex Williamson
2012-08-04 18:08 ` Alex Williamson
2012-08-04 18:08 ` [PATCH 1/2] intel-iommu: " Alex Williamson
2012-08-04 18:08   ` Alex Williamson
2012-08-06  4:51   ` David Ahern
2012-08-04 18:09 ` [PATCH 2/2] amd-iommu: " Alex Williamson
2012-08-04 18:09   ` Alex Williamson
2012-08-06 10:50 ` [PATCH 0/2] " Joerg Roedel
2012-08-06 10:50   ` Joerg Roedel
2012-08-06 12:20   ` Joerg Roedel [this message]
2012-08-06 12:20     ` Joerg Roedel
2012-08-06 14:23     ` Alex Williamson
2012-08-06 17:41 ` Joerg Roedel
2012-08-06 17:41   ` Joerg Roedel

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