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authorWill Deacon <will@kernel.org>2020-01-10 11:40:33 +0000
committerWill Deacon <will@kernel.org>2020-01-10 15:39:43 +0000
commit30d2acb67348537dbf3180057c11f092f4603090 (patch)
tree5aa2c21ab73f1d38b2f7392ca85044d708a2d756 /drivers/iommu
parentd1e5f26f14272b5039cc198569ec4fabed14e6db (diff)
downloadlinux-30d2acb67348537dbf3180057c11f092f4603090.tar.bz2
iommu/io-pgtable-arm: Support non-coherent stage-2 page tables
Commit 9e6ea59f3ff3 ("iommu/io-pgtable: Support non-coherent page tables") added support for non-coherent page-table walks to the Arm IOMMU page-table backends. Unfortunately, it left the stage-2 allocator unchanged, so let's hook that up in the same way. Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/io-pgtable-arm.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index 7b422b9fe05b..ab440b52a5f4 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -910,10 +910,16 @@ arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
}
/* VTCR */
- reg = ARM_64_LPAE_S2_TCR_RES1 |
- (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) |
- (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) |
- (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT);
+ reg = ARM_64_LPAE_S2_TCR_RES1;
+ if (cfg->coherent_walk) {
+ reg |= (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) |
+ (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) |
+ (ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT);
+ } else {
+ reg |= (ARM_LPAE_TCR_SH_OS << ARM_LPAE_TCR_SH0_SHIFT) |
+ (ARM_LPAE_TCR_RGN_NC << ARM_LPAE_TCR_IRGN0_SHIFT) |
+ (ARM_LPAE_TCR_RGN_NC << ARM_LPAE_TCR_ORGN0_SHIFT);
+ }
sl = data->start_level;