6.18-stable review patch. If anyone has any objections, please let me know.
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From: Stephan Gerhold stephan.gerhold@linaro.org
[ Upstream commit 5583a55e074b33ccd88ac0542fd7cd656a7e2c8c ]
Some platforms (e.g. SC8280XP and X1E) support more than 128 stream matching groups. This is more than what is defined as maximum by the ARM SMMU architecture specification. Commit 122611347326 ("iommu/arm-smmu-qcom: Limit the SMR groups to 128") disabled use of the additional groups because they don't exhibit the same behavior as the architecture supported ones.
It seems like this is just another quirk of the hypervisor: When running bare-metal without the hypervisor, the additional groups appear to behave just like all others. The boot firmware uses some of the additional groups, so ignoring them in this situation leads to stream match conflicts whenever we allocate a new SMR group for the same SID.
The workaround exists primarily because the bypass quirk detection fails when using a S2CR register from the additional matching groups, so let's perform the test with the last reliable S2CR (127) and then limit the number of SMR groups only if we detect that we are running below the hypervisor (because of the bypass quirk).
Fixes: 122611347326 ("iommu/arm-smmu-qcom: Limit the SMR groups to 128") Signed-off-by: Stephan Gerhold stephan.gerhold@linaro.org Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 27 ++++++++++++++-------- 1 file changed, 17 insertions(+), 10 deletions(-)
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c index 57c097e876130..c939d0856b719 100644 --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c @@ -431,17 +431,19 @@ static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu)
/* * Some platforms support more than the Arm SMMU architected maximum of - * 128 stream matching groups. For unknown reasons, the additional - * groups don't exhibit the same behavior as the architected registers, - * so limit the groups to 128 until the behavior is fixed for the other - * groups. + * 128 stream matching groups. The additional registers appear to have + * the same behavior as the architected registers in the hardware. + * However, on some firmware versions, the hypervisor does not + * correctly trap and emulate accesses to the additional registers, + * resulting in unexpected behavior. + * + * If there are more than 128 groups, use the last reliable group to + * detect if we need to apply the bypass quirk. */ - if (smmu->num_mapping_groups > 128) { - dev_notice(smmu->dev, "\tLimiting the stream matching groups to 128\n"); - smmu->num_mapping_groups = 128; - } - - last_s2cr = ARM_SMMU_GR0_S2CR(smmu->num_mapping_groups - 1); + if (smmu->num_mapping_groups > 128) + last_s2cr = ARM_SMMU_GR0_S2CR(127); + else + last_s2cr = ARM_SMMU_GR0_S2CR(smmu->num_mapping_groups - 1);
/* * With some firmware versions writes to S2CR of type FAULT are @@ -464,6 +466,11 @@ static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu)
reg = FIELD_PREP(ARM_SMMU_CBAR_TYPE, CBAR_TYPE_S1_TRANS_S2_BYPASS); arm_smmu_gr1_write(smmu, ARM_SMMU_GR1_CBAR(qsmmu->bypass_cbndx), reg); + + if (smmu->num_mapping_groups > 128) { + dev_notice(smmu->dev, "\tLimiting the stream matching groups to 128\n"); + smmu->num_mapping_groups = 128; + } }
for (i = 0; i < smmu->num_mapping_groups; i++) {