linux-kernel - [PATCH v6 4/6] iommu/tegra-smmu: Use swgrp pointer instead of swgroup id

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Date:   Mon, 13 Sep 2021 18:38:56 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     thierry.reding@...il.com, joro@...tes.org, will@...nel.org
Cc:     vdumpa@...dia.com, jonathanh@...dia.com,
        linux-tegra@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, digetx@...il.com
Subject: [PATCH v6 4/6] iommu/tegra-smmu: Use swgrp pointer instead of swgroup id

This patch changes in struct tegra_smmu_group to use swgrp
pointer instead of swgroup, as a preparational change for
the "mappings" debugfs feature.

Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
---
 drivers/iommu/tegra-smmu.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 0f3883045ffa..8fd4985ac91e 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -23,8 +23,8 @@ struct tegra_smmu_group {
 	struct list_head list;
 	struct tegra_smmu *smmu;
 	const struct tegra_smmu_group_soc *group_soc;
+	const struct tegra_smmu_swgroup *swgrp;
 	struct iommu_group *grp;
-	unsigned int swgroup;
 };
 
 struct tegra_smmu {
@@ -897,18 +897,22 @@ static struct iommu_group *tegra_smmu_device_group(struct device *dev)
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct tegra_smmu *smmu = dev_iommu_priv_get(dev);
 	const struct tegra_smmu_group_soc *group_soc;
+	const struct tegra_smmu_swgroup *swgrp;
 	unsigned int swgroup = fwspec->ids[0];
 	struct tegra_smmu_group *group;
 	struct iommu_group *grp;
 
+	/* Find swgrp according to the swgroup id */
+	swgrp = tegra_smmu_find_swgrp(smmu, swgroup);
+
 	/* Find group_soc associating with swgroup */
 	group_soc = tegra_smmu_find_group_soc(smmu, swgroup);
 
 	mutex_lock(&smmu->lock);
 
-	/* Find existing iommu_group associating with swgroup or group_soc */
+	/* Find existing iommu_group associating with swgrp or group_soc */
 	list_for_each_entry(group, &smmu->groups, list)
-		if ((group->swgroup == swgroup) ||
+		if ((swgrp && group->swgrp == swgrp) ||
 		    (group_soc && group->group_soc == group_soc)) {
 			grp = iommu_group_ref_get(group->grp);
 			mutex_unlock(&smmu->lock);
@@ -923,7 +927,7 @@ static struct iommu_group *tegra_smmu_device_group(struct device *dev)
 
 	INIT_LIST_HEAD(&group->list);
 	group->group_soc = group_soc;
-	group->swgroup = swgroup;
+	group->swgrp = swgrp;
 	group->smmu = smmu;
 
 	if (dev_is_pci(dev))
-- 
2.17.1