On Mon, 2012-08-06 at 14:20 +0200, Joerg Roedel wrote: > 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(-) Yes, that's it. Before and after: 00:04.0 PCI bridge: Advanced Micro Devices [AMD] nee ATI RD890 PCI to PCI bridge (PCI express gpp port D) (prog-if 00 [Normal decode]) Capabilities: [190] Access Control Services ACSCap: SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+ UpstreamFwd+ EgressCtrl- DirectTrans+ ACSCtl: SrcValid- TransBlk- ReqRedir- CmpltRedir- UpstreamFwd- EgressCtrl- DirectTrans- Capabilities: [190] Access Control Services ACSCap: SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+ UpstreamFwd+ EgressCtrl- DirectTrans+ ACSCtl: SrcValid+ TransBlk- ReqRedir+ CmpltRedir+ UpstreamFwd+ EgressCtrl- DirectTrans- The former makes iommu grouping put all my VFs in a single group below this device. Correct given the ACS state, but not very useful. Thanks, Alex Tested-by: Alex Williamson <alex.williamson@xxxxxxxxxx> > 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; > } > -- 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
