This is a note to let you know that I've just added the patch titled
iommu/arm-smmu-qcom: apply num_context_bank fixes for SDM630 / SDM660
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iommu-arm-smmu-qcom-apply-num_context_bank-fixes-for.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f408a31244863dd1328975afe37e7b7f14609328
Author: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Date: Sat Sep 7 21:48:12 2024 +0300
iommu/arm-smmu-qcom: apply num_context_bank fixes for SDM630 / SDM660
[ Upstream commit 19eb465c969f3d6ed1b98506d3e470e863b41e16 ]
The Qualcomm SDM630 / SDM660 platform requires the same kind of
workaround as MSM8998: some IOMMUs have context banks reserved by
firmware / TZ, touching those banks resets the board.
Apply the num_context_bank workaround to those two SMMU devices in order
to allow them to be used by Linux.
Fixes: b812834b5329 ("iommu: arm-smmu-qcom: Add sdm630/msm8998 compatibles for qcom quirks")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Reviewed-by: Bjorn Andersson <andersson@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240907-sdm660-wifi-v1-1-e316055142f8@xxxxxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index db2092d5af5eb..d491589360197 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -282,8 +282,15 @@ static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu)
* MSM8998 LPASS SMMU reports 13 context banks, but accessing
* the last context bank crashes the system.
*/
- if (of_device_is_compatible(smmu->dev->of_node, "qcom,msm8998-smmu-v2") && smmu->num_context_banks == 13)
+ if (of_device_is_compatible(smmu->dev->of_node, "qcom,msm8998-smmu-v2") &&
+ smmu->num_context_banks == 13) {
smmu->num_context_banks = 12;
+ } else if (of_device_is_compatible(smmu->dev->of_node, "qcom,sdm630-smmu-v2")) {
+ if (smmu->num_context_banks == 21) /* SDM630 / SDM660 A2NOC SMMU */
+ smmu->num_context_banks = 7;
+ else if (smmu->num_context_banks == 14) /* SDM630 / SDM660 LPASS SMMU */
+ smmu->num_context_banks = 13;
+ }
/*
* Some platforms support more than the Arm SMMU architected maximum of
@@ -346,6 +353,11 @@ static int qcom_adreno_smmuv2_cfg_probe(struct arm_smmu_device *smmu)
/* Support for 16K pages is advertised on some SoCs, but it doesn't seem to work */
smmu->features &= ~ARM_SMMU_FEAT_FMT_AARCH64_16K;
+ /* TZ protects several last context banks, hide them from Linux */
+ if (of_device_is_compatible(smmu->dev->of_node, "qcom,sdm630-smmu-v2") &&
+ smmu->num_context_banks == 5)
+ smmu->num_context_banks = 2;
+
return 0;
}
