linux-kernel - [PATCH 23/23] iommu/arm-smmu: Allow non-strict in pgtable

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Message-Id: <a3aed2f0356e013db18814fb2b14d26256d33022.1626888445.git.robin.murphy@arm.com>
Date:   Wed, 21 Jul 2021 19:20:34 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     joro@...tes.org, will@...nel.org
Cc:     iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        suravee.suthikulpanit@....com, baolu.lu@...ux.intel.com,
        john.garry@...wei.com, dianders@...omium.org
Subject: [PATCH 23/23] iommu/arm-smmu: Allow non-strict in pgtable_quirks interface

To make io-pgtable aware of a flush queue being dynamically enabled,
allow IO_PGTABLE_QUIRK_NON_STRICT to be set even after a domain has been
attached to, and hook up the final piece of the puzzle in iommu-dma.

Signed-off-by: Robin Murphy <robin.murphy@....com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 15 +++++++++++++++
 drivers/iommu/arm/arm-smmu/arm-smmu.c       | 11 +++++++++++
 drivers/iommu/dma-iommu.c                   |  3 +++
 3 files changed, 29 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 260b560d0075..ca19e4551468 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2714,6 +2714,20 @@ static int arm_smmu_enable_nesting(struct iommu_domain *domain)
 	return ret;
 }
 
+static int arm_smmu_set_pgtable_quirks(struct iommu_domain *domain,
+		unsigned long quirks)
+{
+	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+
+	if (quirks == IO_PGTABLE_QUIRK_NON_STRICT && smmu_domain->pgtbl_ops) {
+		struct io_pgtable *iop = io_pgtable_ops_to_pgtable(smmu_domain->pgtbl_ops);
+
+		iop->cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT;
+		return 0;
+	}
+	return -EINVAL;
+}
+
 static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
 {
 	return iommu_fwspec_add_ids(dev, args->args, 1);
@@ -2828,6 +2842,7 @@ 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,
+	.set_pgtable_quirks	= arm_smmu_set_pgtable_quirks,
 	.of_xlate		= arm_smmu_of_xlate,
 	.get_resv_regions	= arm_smmu_get_resv_regions,
 	.put_resv_regions	= generic_iommu_put_resv_regions,
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 2c717f3be056..0f181f76c31b 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1522,6 +1522,17 @@ static int arm_smmu_set_pgtable_quirks(struct iommu_domain *domain,
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
 	int ret = 0;
 
+	if (quirks == IO_PGTABLE_QUIRK_NON_STRICT) {
+		struct io_pgtable *iop;
+
+		if (!smmu_domain->pgtbl_ops)
+			return -EINVAL;
+
+		iop = io_pgtable_ops_to_pgtable(smmu_domain->pgtbl_ops);
+		iop->cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT;
+		return 0;
+	}
+
 	mutex_lock(&smmu_domain->init_mutex);
 	if (smmu_domain->smmu)
 		ret = -EPERM;
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 64e9eefce00e..6b51e45e2358 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -16,6 +16,7 @@
 #include <linux/huge_mm.h>
 #include <linux/iommu.h>
 #include <linux/iova.h>
+#include <linux/io-pgtable.h>
 #include <linux/irq.h>
 #include <linux/mm.h>
 #include <linux/mutex.h>
@@ -326,6 +327,8 @@ int iommu_dma_init_fq(struct iommu_domain *domain)
 		return -ENODEV;
 	}
 	cookie->fq_domain = domain;
+	if (domain->ops->set_pgtable_quirks)
+		domain->ops->set_pgtable_quirks(domain, IO_PGTABLE_QUIRK_NON_STRICT);
 	return 0;
 }
 
-- 
2.25.1