[PATCH] 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")
Reported-by: Guilherme G. Piccoli <redacted>
Signed-off-by: Gavin Shan <redacted>
Tested-by: Guilherme G. Piccoli <redacted>
---
 arch/powerpc/platforms/pseries/iommu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index b7dfc13..3e8865b 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) */

-- 
2.1.0

On Thu, May 26, 2016 at 09:56:07AM +1000, Gavin Shan wrote:

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 <redacted>
Signed-off-by: Gavin Shan <redacted>
Tested-by: Guilherme G. Piccoli <redacted>
---
arch/powerpc/platforms/pseries/iommu.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

There are two mails sent for same patch. I don't know how is
happening. Maybe there is something wrong in my mailbox scripts.
Please ignore this one and sorry for the noise.

Thanks,
Gavin 

On Wed, 2016-25-05 at 23:56:07 UTC, Gavin Shan wrote:

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")

That commit was Cc'ed to stable, so this needs to be also.

I've added it here.

cheers

On Wed, 2016-25-05 at 23:56:07 UTC, Gavin Shan wrote:

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 <redacted>
Signed-off-by: Gavin Shan <redacted>
Tested-by: Guilherme G. Piccoli <redacted>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/8a934efe94347eee843aeea65b

cheers