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@xxxxxxx> 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@xxxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
