linux-kernel - [PATCH 1/3] iommu/arm-smmu-v3: save bypass in smmu device structure

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Date: Sun, 24 Mar 2024 20:28:58 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>, 
 Joerg Roedel <joro@...tes.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Marc Zyngier <maz@...nel.org>
Cc: Bixuan Cui <cuibixuan@...wei.com>, linux-arm-kernel@...ts.infradead.org, 
 iommu@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Peng Fan <peng.fan@....com>
Subject: [PATCH 1/3] iommu/arm-smmu-v3: save bypass in smmu device
 structure

From: Peng Fan <peng.fan@....com>

'bypass' will be used in smmu resume function, so need to save
its value for future usage.

Signed-off-by: Peng Fan <peng.fan@....com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 9 ++++-----
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 +
 2 files changed, 5 insertions(+), 5 deletions(-)

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 5ed036225e69..a8a569573c2f 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3494,7 +3494,7 @@ static int arm_smmu_device_disable(struct arm_smmu_device *smmu)
 	return ret;
 }
 
-static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass)
+static int arm_smmu_device_reset(struct arm_smmu_device *smmu)
 {
 	int ret;
 	u32 reg, enables;
@@ -3612,7 +3612,7 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass)
 		enables &= ~(CR0_EVTQEN | CR0_PRIQEN);
 
 	/* Enable the SMMU interface, or ensure bypass */
-	if (!bypass || disable_bypass) {
+	if (!smmu->bypass || disable_bypass) {
 		enables |= CR0_SMMUEN;
 	} else {
 		ret = arm_smmu_update_gbpa(smmu, 0, GBPA_ABORT);
@@ -4007,7 +4007,6 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	resource_size_t ioaddr;
 	struct arm_smmu_device *smmu;
 	struct device *dev = &pdev->dev;
-	bool bypass;
 
 	smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL);
 	if (!smmu)
@@ -4023,7 +4022,7 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	}
 
 	/* Set bypass mode according to firmware probing result */
-	bypass = !!ret;
+	smmu->bypass = !!ret;
 
 	/* Base address */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -4087,7 +4086,7 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	arm_smmu_rmr_install_bypass_ste(smmu);
 
 	/* Reset the device */
-	ret = arm_smmu_device_reset(smmu, bypass);
+	ret = arm_smmu_device_reset(smmu);
 	if (ret)
 		return ret;
 
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 23baf117e7e4..97064a6aa87c 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -683,6 +683,7 @@ struct arm_smmu_device {
 
 	struct rb_root			streams;
 	struct mutex			streams_mutex;
+	bool				bypass;
 };
 
 struct arm_smmu_stream {

-- 
2.37.1