The CMDQV extension in NVIDIA Tegra241 SoC only supports CS_NONE in the CS field of CMD_SYNC. Add a new SMMU option to accommodate that. Suggested-by: Will Deacon <will@xxxxxxxxxx> Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx> --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 16 +++++++++++++++- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 + 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index 214b2bce28fa..afdb8a76a72a 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -351,6 +351,15 @@ static struct arm_smmu_cmdq *arm_smmu_get_cmdq(struct arm_smmu_device *smmu) return &smmu->cmdq; } +static bool arm_smmu_cmdq_needs_busy_polling(struct arm_smmu_device *smmu, + struct arm_smmu_cmdq *cmdq) +{ + if (cmdq == &smmu->cmdq) + return false; + + return smmu->options & ARM_SMMU_OPT_TEGRA241_CMDQV; +} + static void arm_smmu_cmdq_build_sync_cmd(u64 *cmd, struct arm_smmu_device *smmu, struct arm_smmu_cmdq *cmdq, u32 prod) { @@ -369,6 +378,8 @@ static void arm_smmu_cmdq_build_sync_cmd(u64 *cmd, struct arm_smmu_device *smmu, } arm_smmu_cmdq_build_cmd(cmd, &ent); + if (arm_smmu_cmdq_needs_busy_polling(smmu, cmdq)) + u64p_replace_bits(cmd, CMDQ_SYNC_0_CS_NONE, CMDQ_SYNC_0_CS); } void __arm_smmu_cmdq_skip_err(struct arm_smmu_device *smmu, @@ -423,6 +434,8 @@ void __arm_smmu_cmdq_skip_err(struct arm_smmu_device *smmu, /* Convert the erroneous command into a CMD_SYNC */ arm_smmu_cmdq_build_cmd(cmd, &cmd_sync); + if (arm_smmu_cmdq_needs_busy_polling(smmu, cmdq)) + u64p_replace_bits(cmd, CMDQ_SYNC_0_CS_NONE, CMDQ_SYNC_0_CS); queue_write(Q_ENT(q, cons), cmd, q->ent_dwords); } @@ -706,7 +719,8 @@ static int arm_smmu_cmdq_poll_until_sync(struct arm_smmu_device *smmu, struct arm_smmu_cmdq *cmdq, struct arm_smmu_ll_queue *llq) { - if (smmu->options & ARM_SMMU_OPT_MSIPOLL) + if (smmu->options & ARM_SMMU_OPT_MSIPOLL && + !arm_smmu_cmdq_needs_busy_polling(smmu, cmdq)) return __arm_smmu_cmdq_poll_until_msi(smmu, cmdq, llq); return __arm_smmu_cmdq_poll_until_consumed(smmu, cmdq, llq); diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h index ce76357b6fc2..ebd9db4789ff 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -665,6 +665,7 @@ struct arm_smmu_device { #define ARM_SMMU_OPT_PAGE0_REGS_ONLY (1 << 1) #define ARM_SMMU_OPT_MSIPOLL (1 << 2) #define ARM_SMMU_OPT_CMDQ_FORCE_SYNC (1 << 3) +#define ARM_SMMU_OPT_TEGRA241_CMDQV (1 << 4) u32 options; struct arm_smmu_cmdq cmdq; -- 2.43.0