From 10b35b2b7485c342334a48cf199063eed8b8748e Mon Sep 17 00:00:00 2001 From: Alexey Kardashevskiy Date: Fri, 5 Jun 2015 16:35:05 +1000 Subject: [PATCH] powerpc/powernv: Do not set "read" flag if direction==DMA_NONE 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 as the old TCE value (more precisely - the permission bits) will be used to decide whether to put the page or not. This adds iommu_direction_to_tce_perm() (its counterpart is there already) and uses it for powernv's pnv_tce_build(). Signed-off-by: Alexey Kardashevskiy Reviewed-by: David Gibson Reviewed-by: Gavin Shan Signed-off-by: Michael Ellerman --- Reading git-format-patch failed