linux-kernel - [PATCH v2 12/17] iommu/arm-smmu-v3: Pass in user_cfg to arm_smmu_domain

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Message-ID: <931282642f7b2a6a73cdbdcecd428bdeb1ecad27.1683688960.git.nicolinc@nvidia.com>
Date:   Tue, 9 May 2023 20:33:32 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     <jgg@...dia.com>, <robin.murphy@....com>, <will@...nel.org>
CC:     <eric.auger@...hat.com>, <kevin.tian@...el.com>,
        <baolu.lu@...ux.intel.com>, <joro@...tes.org>,
        <shameerali.kolothum.thodi@...wei.com>, <jean-philippe@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
        <alex.williamson@...hat.com>, <yi.l.liu@...el.com>
Subject: [PATCH v2 12/17] iommu/arm-smmu-v3: Pass in user_cfg to arm_smmu_domain_finalise

The struct iommu_hwpt_arm_smmuv3 contains the userspace Stream Table Entry
info (for ARM_SMMU_DOMAIN_S1) and an "S2" flag (for ARM_SMMU_DOMAIN_S2).

Pass in a valid user_cfg pointer, so arm_smmu_domain_finalise() can handle
both types of user domain finalizations.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 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 8b827247f4b9..b8c189b732ba 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -26,6 +26,7 @@
 #include <linux/pci.h>
 #include <linux/pci-ats.h>
 #include <linux/platform_device.h>
+#include <uapi/linux/iommufd.h>
 
 #include "arm-smmu-v3.h"
 #include "../../dma-iommu.h"
@@ -2211,7 +2212,8 @@ static int arm_smmu_domain_finalise_s2(struct arm_smmu_domain *smmu_domain,
 }
 
 static int arm_smmu_domain_finalise(struct iommu_domain *domain,
-				    struct arm_smmu_master *master)
+				    struct arm_smmu_master *master,
+				    const struct iommu_hwpt_arm_smmuv3 *user_cfg)
 {
 	int ret;
 	unsigned long ias, oas;
@@ -2223,12 +2225,18 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain,
 				 struct io_pgtable_cfg *);
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
 	struct arm_smmu_device *smmu = smmu_domain->smmu;
+	bool user_cfg_s2 = user_cfg && (user_cfg->flags & IOMMU_SMMUV3_FLAG_S2);
 
 	if (domain->type == IOMMU_DOMAIN_IDENTITY) {
 		smmu_domain->stage = ARM_SMMU_DOMAIN_BYPASS;
 		return 0;
 	}
 
+	if (user_cfg_s2 && !(smmu->features & ARM_SMMU_FEAT_TRANS_S2))
+		return -EINVAL;
+	if (user_cfg_s2)
+		smmu_domain->stage = ARM_SMMU_DOMAIN_S2;
+
 	/* Restrict the stage to what we can actually support */
 	if (!(smmu->features & ARM_SMMU_FEAT_TRANS_S1))
 		smmu_domain->stage = ARM_SMMU_DOMAIN_S2;
@@ -2472,7 +2480,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 
 	if (!smmu_domain->smmu) {
 		smmu_domain->smmu = smmu;
-		ret = arm_smmu_domain_finalise(domain, master);
+		ret = arm_smmu_domain_finalise(domain, master, NULL);
 		if (ret) {
 			smmu_domain->smmu = NULL;
 			goto out_unlock;
-- 
2.40.1