diff options
| author | Nate Watterson <nwatters@codeaurora.org> | 2016-12-20 23:11:48 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-15 15:53:13 +0100 |
| commit | 3a8ab788bf01af231eaccce4b92168888da521cd (patch) | |
| tree | 6bf22e39739baab0e4837526febdef85e3eef441 /drivers | |
| parent | 6f51c8a58397979d8cb38616b51da4d54c7e9e54 (diff) | |
iommu/arm-smmu-v3: Clear prior settings when updating STEs
[ Upstream commit 810871c57011eb3e89e6768932757f169d666cd2 ]
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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/arm-smmu-v3.c | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index e6f9b2d745ca..d3d975ae24b7 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -1040,13 +1040,8 @@ 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 @@ -1081,7 +1076,6 @@ 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) { |