linux-kernel - [RFC PATCH v4 13/13] iommu/arm-smmu-v3: Realize support_dirty

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Date:   Fri, 7 May 2021 18:22:11 +0800
From:   Keqian Zhu <zhukeqian1@...wei.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>,
        Robin Murphy <robin.murphy@....com>,
        "Will Deacon" <will@...nel.org>, Joerg Roedel <joro@...tes.org>,
        "Jean-Philippe Brucker" <jean-philippe@...aro.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        "Yi Sun" <yi.y.sun@...ux.intel.com>,
        Tian Kevin <kevin.tian@...el.com>
CC:     Alex Williamson <alex.williamson@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        <wanghaibin.wang@...wei.com>, <jiangkunkun@...wei.com>,
        <yuzenghui@...wei.com>, <lushenming@...wei.com>
Subject: [RFC PATCH v4 13/13] iommu/arm-smmu-v3: Realize support_dirty_log iommu ops

From: Kunkun Jiang <jiangkunkun@...wei.com>

We have implemented these interfaces required to support iommu
dirty log tracking. The last step is reporting this feature to
upper user, then the user can perform higher policy base on it.
For arm smmuv3, it is equal to ARM_SMMU_FEAT_HD.

Co-developed-by: Keqian Zhu <zhukeqian1@...wei.com>
Signed-off-by: Kunkun Jiang <jiangkunkun@...wei.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 8 ++++++++
 1 file changed, 8 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 9b4739247dbb..59d11f084199 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2684,6 +2684,13 @@ static int arm_smmu_merge_page(struct iommu_domain *domain, unsigned long iova,
 	return ret;
 }
 
+static bool arm_smmu_support_dirty_log(struct iommu_domain *domain)
+{
+	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+
+	return !!(smmu_domain->smmu->features & ARM_SMMU_FEAT_HD);
+}
+
 static int arm_smmu_switch_dirty_log(struct iommu_domain *domain, bool enable,
 				     unsigned long iova, size_t size, int prot)
 {
@@ -2872,6 +2879,7 @@ static struct iommu_ops arm_smmu_ops = {
 	.release_device		= arm_smmu_release_device,
 	.device_group		= arm_smmu_device_group,
 	.enable_nesting		= arm_smmu_enable_nesting,
+	.support_dirty_log	= arm_smmu_support_dirty_log,
 	.switch_dirty_log	= arm_smmu_switch_dirty_log,
 	.sync_dirty_log		= arm_smmu_sync_dirty_log,
 	.clear_dirty_log	= arm_smmu_clear_dirty_log,
-- 
2.19.1