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 061a61f4ff0a..816f5937345a 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 50efc804f91c..21f034f0ff4c 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
