[PATCH RFCv2 23/24] iommu/arm-smmu-v3: Add set_dirty_tracking() support

From: Joao Martins <joao.m.martins@oracle.com>
To: iommu@lists.linux.dev
Cc: Jason Gunthorpe <jgg@nvidia.com>,
	Kevin Tian <kevin.tian@intel.com>,
	Shameerali Kolothum Thodi  <shameerali.kolothum.thodi@huawei.com>,
	Lu Baolu <baolu.lu@linux.intel.com>, Yi Liu <yi.l.liu@intel.com>,
	Yi Y Sun <yi.y.sun@intel.com>, Eric Auger <eric.auger@redhat.com>,
	Nicolin Chen <nicolinc@nvidia.com>,
	Joerg Roedel <joro@8bytes.org>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
	Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	kvm@vger.kernel.org, Joao Martins <joao.m.martins@oracle.com>
Subject: [PATCH RFCv2 23/24] iommu/arm-smmu-v3: Add set_dirty_tracking() support
Date: Thu, 18 May 2023 21:46:49 +0100	[thread overview]
Message-ID: <20230518204650.14541-24-joao.m.martins@oracle.com> (raw)
In-Reply-To: <20230518204650.14541-1-joao.m.martins@oracle.com>

Dirty tracking will always be enabled with DBM=1 modifier enabled
by default.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 22 +++++++++++++++++++++
 1 file changed, 22 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 2cde14003469..bf0aac333725 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2787,6 +2787,27 @@ static int arm_smmu_read_and_clear_dirty(struct iommu_domain *domain,
 	return ret;
 }
 
+static int arm_smmu_set_dirty_tracking(struct iommu_domain *domain,
+				       bool enabled)
+{
+	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+	struct io_pgtable_ops *ops = smmu_domain->pgtbl_ops;
+
+	if (smmu_domain->stage != ARM_SMMU_DOMAIN_S1)
+		return -EINVAL;
+
+	if (!ops) {
+		pr_err_once("io-pgtable don't support dirty tracking\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * Always enabled and the dirty bitmap is cleared prior to
+	 * set_dirty_tracking().
+	 */
+	return 0;
+}
+
 static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
 {
 	return iommu_fwspec_add_ids(dev, args->args, 1);
@@ -2916,6 +2937,7 @@ static struct iommu_ops arm_smmu_ops = {
 		.enable_nesting		= arm_smmu_enable_nesting,
 		.free			= arm_smmu_domain_free,
 		.read_and_clear_dirty	= arm_smmu_read_and_clear_dirty,
+		.set_dirty_tracking     = arm_smmu_set_dirty_tracking,
 	}
 };
 
-- 
2.17.2

