powerpc/pseries: Fix PCI config address for DDW

In commit 8445a87f7092 "powerpc/iommu: Remove the dependency on EEH
struct in DDW mechanism", the PE address was replaced with the PCI
config address in order to remove dependency on EEH. According to PAPR
spec, firmware (pHyp or QEMU) should accept "xxBBSSxx" format PCI config
address, not "xxxxBBSS" provided by the patch. Note that "BB" is PCI bus
number and "SS" is the combination of slot and function number.

This fixes the PCI address passed to DDW RTAS calls.

Fixes: 8445a87f7092 ("powerpc/iommu: Remove the dependency on EEH struct in DDW mechanism")
Cc: stable@vger.kernel.org # v3.4+
Reported-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Tested-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index b7dfc1359d0113d570fe9ea7f702c728814dc66f..3e8865b187de22187a39e1bc66b662e464009f14 100644 (file)
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -927,7 +927,7 @@ static int query_ddw(struct pci_dev *dev, const u32 *ddw_avail,
        dn = pci_device_to_OF_node(dev);
        pdn = PCI_DN(dn);
        buid = pdn->phb->buid;
-       cfg_addr = (pdn->busno << 8) | pdn->devfn;
+       cfg_addr = ((pdn->busno << 16) | (pdn->devfn << 8));
 
        ret = rtas_call(ddw_avail[0], 3, 5, (u32 *)query,
                  cfg_addr, BUID_HI(buid), BUID_LO(buid));
@@ -956,7 +956,7 @@ static int create_ddw(struct pci_dev *dev, const u32 *ddw_avail,
        dn = pci_device_to_OF_node(dev);
        pdn = PCI_DN(dn);
        buid = pdn->phb->buid;
-       cfg_addr = (pdn->busno << 8) | pdn->devfn;
+       cfg_addr = ((pdn->busno << 16) | (pdn->devfn << 8));
 
        do {
                /* extra outputs are LIOBN and dma-addr (hi, lo) */