linux-kernel - [PATCH v12 11/17] arm-smmu-v3: Add blocking domain support

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Date:   Fri, 26 Aug 2022 20:11:35 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>, Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Vinod Koul <vkoul@...nel.org>
Cc:     Eric Auger <eric.auger@...hat.com>, Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        Zhangfei Gao <zhangfei.gao@...aro.org>,
        Zhu Tony <tony.zhu@...el.com>, iommu@...ts.linux.dev,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH v12 11/17] arm-smmu-v3: Add blocking domain support

The ARM SMMUv3 hardwares support blocking DMA transactions by clearing
the translation table entries. This implements a real blocking domain
to avoid using an empty UNMANAGED domain.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Tested-by: Zhangfei Gao <zhangfei.gao@...aro.org>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

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 f88541be8213..5520a9607758 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -88,6 +88,8 @@ static struct arm_smmu_option_prop arm_smmu_options[] = {
 	{ 0, NULL},
 };
 
+static void arm_smmu_detach_dev(struct arm_smmu_master *master);
+
 static void parse_driver_options(struct arm_smmu_device *smmu)
 {
 	int i = 0;
@@ -2004,10 +2006,28 @@ static bool arm_smmu_capable(enum iommu_cap cap)
 	}
 }
 
+static int blocking_domain_attach_dev(struct iommu_domain *domain,
+				      struct device *dev)
+{
+	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
+
+	arm_smmu_detach_dev(master);
+	return 0;
+}
+
+static struct iommu_domain blocking_domain = {
+	.ops = &(const struct iommu_domain_ops) {
+		.attach_dev	= blocking_domain_attach_dev
+	}
+};
+
 static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
 {
 	struct arm_smmu_domain *smmu_domain;
 
+	if (type == IOMMU_DOMAIN_BLOCKED)
+		return &blocking_domain;
+
 	if (type != IOMMU_DOMAIN_UNMANAGED &&
 	    type != IOMMU_DOMAIN_DMA &&
 	    type != IOMMU_DOMAIN_DMA_FQ &&
-- 
2.25.1