@@ -628,10 +628,18 @@ static int pnv_tce_build(struct iommu_table *tbl, long index, long npages,
__be64 *tcep, *tces;
u64 rpn;
- proto_tce = TCE_PCI_READ; // Read allowed
-
- if (direction != DMA_TO_DEVICE)
- proto_tce |= TCE_PCI_WRITE;
+ switch (direction) {
+ case DMA_BIDIRECTIONAL:
+ case DMA_FROM_DEVICE:
+ proto_tce = TCE_PCI_READ | TCE_PCI_WRITE;
+ break;
+ case DMA_TO_DEVICE:
+ proto_tce = TCE_PCI_READ;
+ break;
+ default:
+ proto_tce = 0;
+ break;
+ }
tces = tcep = ((__be64 *)tbl->it_base) + index - tbl->it_offset;
rpn = __pa(uaddr) >> tbl->it_page_shift;
Normally a bitmap from the iommu_table is used to track what TCE entry is in use. Since we are going to use iommu_table without its locks and do xchg() instead, it becomes essential not to put bits which are not implied in the direction flag. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> --- arch/powerpc/platforms/powernv/pci.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-)