As of today, if the DDW is big enough to fit (1 << MAX_PHYSMEM_BITS) it's
possible to use direct DMA mapping even with pmem region.
But, if that happens, the window size (len) is set to
(MAX_PHYSMEM_BITS - page_shift) instead of MAX_PHYSMEM_BITS, causing a
pagesize times smaller DDW to be created, being insufficient for correct
usage.
Fix this so the correct window size is used in this case.
Fixes: bf6e2d562bbc4("powerpc/dma: Fallback to dma_ops when persistent memory
present")
Signed-off-by: Leonardo Bras <leobra...@gmail.com>
---
arch/powerpc/platforms/pseries/iommu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/platforms/pseries/iommu.c
b/arch/powerpc/platforms/pseries/iommu.c
index 9fc5217f0c8e..836cbbe0ecc5 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -1229,7 +1229,7 @@ static u64 enable_ddw(struct pci_dev *dev, struct
device_node *pdn)
if (pmem_present) {
if (query.largest_available_block >=
(1ULL << (MAX_PHYSMEM_BITS - page_shift)))
- len = MAX_PHYSMEM_BITS - page_shift;
+ len = MAX_PHYSMEM_BITS;
else
dev_info(&dev->dev, "Skipping ibm,pmemory");
}
--
2.30.2
