From: Gavin Shan Date: Wed, 25 May 2016 23:56:07 +0000 (+1000) Subject: powerpc/pseries: Fix PCI config address for DDW X-Git-Tag: firefly_0821_release~176^2~4^2~37^2~138 X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=3abd809ecc4a9458a09dc8aeb5015f5e725ade20;p=firefly-linux-kernel-4.4.55.git powerpc/pseries: Fix PCI config address for DDW commit 8a934efe94347eee843aeea65bdec8077a79e259 upstream. 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") Reported-by: Guilherme G. Piccoli Signed-off-by: Gavin Shan Tested-by: Guilherme G. Piccoli Signed-off-by: Michael Ellerman Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c index b7dfc1359d01..3e8865b187de 100644 --- 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) */