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.roe...@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.roe...@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
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