powerpc/ioda: Set "read" permission when "write" is set

Quite often drivers set only "write" permission assuming that this
includes "read" permission as well and this works on plenty of
platforms. However IODA2 is strict about this and produces an EEH when
"read" permission is not set and reading happens.

This adds a workaround in the IODA code to always add the "read" bit
when the "write" bit is set.

Fixes: 10b35b2b7485 ("powerpc/powernv: Do not set "read" flag if direction==DMA_NONE")
Cc: stable@vger.kernel.org # 4.2+
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Tested-by: Douglas Miller <dougmill@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index d25ff2292ae2..b1ef84a6c9d1 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -599,6 +599,9 @@ int pnv_tce_build(struct iommu_table *tbl, long index, long npages,
         u64 rpn = __pa(uaddr) >> tbl->it_page_shift;
         long i;
 
+        if (proto_tce & TCE_PCI_WRITE)
+                proto_tce |= TCE_PCI_READ;
+
         for (i = 0; i < npages; i++) {
                 unsigned long newtce = proto_tce |
                         ((rpn + i) << tbl->it_page_shift);
@@ -620,6 +623,9 @@ int pnv_tce_xchg(struct iommu_table *tbl, long index,
 
         BUG_ON(*hpa & ~IOMMU_PAGE_MASK(tbl));
 
+        if (newtce & TCE_PCI_WRITE)
+                newtce |= TCE_PCI_READ;
+
         oldtce = xchg(pnv_tce(tbl, idx), cpu_to_be64(newtce));
         *hpa = be64_to_cpu(oldtce) & ~(TCE_PCI_READ | TCE_PCI_WRITE);
         *direction = iommu_tce_direction(oldtce);