diff options
| author | Will Deacon <will.deacon@arm.com> | 2014-02-06 14:59:05 (GMT) |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-03-05 16:13:51 (GMT) |
| commit | 01ffe6154b9939874fb5d7d4cc59d66bec9ebb68 (patch) | |
| tree | b224540f80d47f189cc0530819496e3ad7305481 /drivers/iommu | |
| parent | 011b7e12aeb92635e5ff3864f5ba6f388720f6ec (diff) | |
| download | linux-fsl-qoriq-01ffe6154b9939874fb5d7d4cc59d66bec9ebb68.tar.xz | |
iommu/arm-smmu: set CBARn.BPSHCFG to NSH for s1-s2-bypass contexts
commit 57ca90f6800987ac274d7ba065ae6692cdf9bcd7 upstream.
Whilst trying to bring-up an SMMUv2 implementation with the table
walker plumbed into a coherent interconnect, I noticed that the memory
transactions targetting the CPU caches from the SMMU were marked as
outer-shareable instead of inner-shareable.
After a bunch of digging, it seems that we actually need to program
CBARn.BPSHCFG for s1-s2-bypass contexts to act as non-shareable in order
for the shareability configured in the corresponding TTBCR not to be
overridden with an outer-shareable attribute.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/arm-smmu.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 64b814f..24a60b99 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -190,6 +190,9 @@ #define ARM_SMMU_GR1_CBAR(n) (0x0 + ((n) << 2)) #define CBAR_VMID_SHIFT 0 #define CBAR_VMID_MASK 0xff +#define CBAR_S1_BPSHCFG_SHIFT 8 +#define CBAR_S1_BPSHCFG_MASK 3 +#define CBAR_S1_BPSHCFG_NSH 3 #define CBAR_S1_MEMATTR_SHIFT 12 #define CBAR_S1_MEMATTR_MASK 0xf #define CBAR_S1_MEMATTR_WB 0xf @@ -646,11 +649,16 @@ static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain) if (smmu->version == 1) reg |= root_cfg->irptndx << CBAR_IRPTNDX_SHIFT; - /* Use the weakest memory type, so it is overridden by the pte */ - if (stage1) - reg |= (CBAR_S1_MEMATTR_WB << CBAR_S1_MEMATTR_SHIFT); - else + /* + * Use the weakest shareability/memory types, so they are + * overridden by the ttbcr/pte. + */ + if (stage1) { + reg |= (CBAR_S1_BPSHCFG_NSH << CBAR_S1_BPSHCFG_SHIFT) | + (CBAR_S1_MEMATTR_WB << CBAR_S1_MEMATTR_SHIFT); + } else { reg |= ARM_SMMU_CB_VMID(root_cfg) << CBAR_VMID_SHIFT; + } writel_relaxed(reg, gr1_base + ARM_SMMU_GR1_CBAR(root_cfg->cbndx)); if (smmu->version > 1) { |