On 10/19/23 04:19, Georgi Djakov wrote:
The ARM MMU-500 implements a Translation Buffer Unit (TBU) for each
connected master besides a single TCU which controls and manages the
address translations.
Allow the Qualcomm SMMU driver to probe for any TBU devices that can
provide additional debug features like triggering transactions, logging
outstanding transactions, snapshot capture etc. The most basic use-case
would be to get information from the TBUs and print it during a context
fault.
Signed-off-by: Georgi Djakov <quic_c_gdjako@xxxxxxxxxxx>
---
drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 12 ++++++++++++
drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h | 4 +++-
2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index 7f52ac67495f..655c7f50ca84 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -1,12 +1,14 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved
*/
#include <linux/acpi.h>
#include <linux/adreno-smmu-priv.h>
#include <linux/delay.h>
#include <linux/of_device.h>
+#include <linux/of_platform.h>
#include <linux/firmware/qcom/qcom_scm.h>
#include "arm-smmu.h"
@@ -466,6 +468,16 @@ static struct arm_smmu_device *qcom_smmu_create(struct arm_smmu_device *smmu,
qsmmu->smmu.impl = impl;
qsmmu->cfg = data->cfg;
+ /* Populate TBU devices if such are present in DT */
+ if (np && of_device_is_compatible(np, "arm,mmu-500")) {
I'd say this can be unconditional.
+ int ret;
+
+ INIT_LIST_HEAD(&qsmmu->tbu_list);
This list is unused.
Konrad
