linux-kernel - [PATCH] powernv: fix VFIO support with PHB3

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Message-Id: <1386332504-18339-1-git-send-email-cascardo@linux.vnet.ibm.com>
Date:	Fri,  6 Dec 2013 10:21:44 -0200
From:	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
To:	benh@...nel.crashing.org
Cc:	paulus@...ba.org, shangw@...ux.vnet.ibm.com, aik@...abs.ru,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
Subject: [PATCH] powernv: fix VFIO support with PHB3

I have recently found out that no iommu_groups could be found under
/sys/ on a P8. That prevents PCI passthrough from working.

During my investigation, I found out there seems to be a missing
iommu_register_group for PHB3. The following patch seems to fix the
problem. After applying it, I see iommu_groups under
/sys/kernel/iommu_groups/, and can also bind vfio-pci to an adapter,
which gives me a device at /dev/vfio/.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/pci-ioda.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 084cdfa..2c6d173 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -720,6 +720,7 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
 		tbl->it_type = TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE;
 	}
 	iommu_init_table(tbl, phb->hose->node);
+	iommu_register_group(tbl, pci_domain_nr(pe->pbus), pe->pe_number);
 
 	if (pe->pdev)
 		set_iommu_table_base(&pe->pdev->dev, tbl);
-- 
1.7.1

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