linux-kernel - [PATCH v8 4/7] iommu/arm-smmu: Add a pointer to the attached device to smmu

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Date:   Thu, 11 Jun 2020 16:21:25 -0600
From:   Jordan Crouse <jcrouse@...eaurora.org>
To:     linux-arm-msm@...r.kernel.org
Cc:     iommu@...ts.linux-foundation.org, freedreno@...ts.freedesktop.org,
        Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v8 4/7] iommu/arm-smmu: Add a pointer to the attached device to smmu_domain

Add a link to the pointer to the struct device that is attached to a
domain. This makes it easy to get the pointer if it is needed in the
implementation specific code.

Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
---

 drivers/iommu/arm-smmu.c | 1 +
 drivers/iommu/arm-smmu.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 048de2681670..743d75b9ff3f 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -801,6 +801,7 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
 		cfg->asid = cfg->cbndx;
 
 	smmu_domain->smmu = smmu;
+	smmu_domain->dev = dev;
 
 	pgtbl_cfg = (struct io_pgtable_cfg) {
 		.pgsize_bitmap	= smmu->pgsize_bitmap,
diff --git a/drivers/iommu/arm-smmu.h b/drivers/iommu/arm-smmu.h
index 5f2de20e883b..d33cfe26b2f5 100644
--- a/drivers/iommu/arm-smmu.h
+++ b/drivers/iommu/arm-smmu.h
@@ -345,6 +345,7 @@ struct arm_smmu_domain {
 	struct mutex			init_mutex; /* Protects smmu pointer */
 	spinlock_t			cb_lock; /* Serialises ATS1* ops and TLB syncs */
 	struct iommu_domain		domain;
+	struct device			*dev;	/* Device attached to this domain */
 };
 
 static inline u32 arm_smmu_lpae_tcr(struct io_pgtable_cfg *cfg)
-- 
2.17.1