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iommu/arm-smmu-v3: Clear prior settings when updating STEs

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To prevent corruption of the stage-1 context pointer field when
updating STEs, rebuild the entire containing dword instead of
clearing individual fields.

Signed-off-by: Nate Watterson <nwatters@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Nate Watterson 2016-12-20 23:11:48 -05:00 committed by Will Deacon
parent a121103c92
commit 810871c570
1 changed files with 2 additions and 8 deletions
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10
drivers/iommu/arm-smmu-v3.c
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@ -1042,13 +1042,8 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_device *smmu, u32 sid,
}
}
/* Nuke the existing Config, as we're going to rewrite it */
val &= ~(STRTAB_STE_0_CFG_MASK << STRTAB_STE_0_CFG_SHIFT);
if (ste->valid)
val |= STRTAB_STE_0_V;
else
val &= ~STRTAB_STE_0_V;
/* Nuke the existing STE_0 value, as we're going to rewrite it */
val = ste->valid ? STRTAB_STE_0_V : 0;
if (ste->bypass) {
val |= disable_bypass ? STRTAB_STE_0_CFG_ABORT
@ -1083,7 +1078,6 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_device *smmu, u32 sid,
val |= (ste->s1_cfg->cdptr_dma & STRTAB_STE_0_S1CTXPTR_MASK
<< STRTAB_STE_0_S1CTXPTR_SHIFT) |
STRTAB_STE_0_CFG_S1_TRANS;
}
if (ste->s2_cfg) {