linux-kernel - [RFC PATCHES 03/17] iommu: Add helper to set iopf handler for domain

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Message-Id: <20230530053724.232765-4-baolu.lu@linux.intel.com>
Date:   Tue, 30 May 2023 13:37:10 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Jason Gunthorpe <jgg@...pe.ca>, Kevin Tian <kevin.tian@...el.com>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Nicolin Chen <nicolinc@...dia.com>,
        Yi Liu <yi.l.liu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     iommu@...ts.linux.dev, linux-kselftest@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [RFC PATCHES 03/17] iommu: Add helper to set iopf handler for domain

To avoid open code everywhere. No intentional functionality change.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 include/linux/iommu.h | 10 ++++++++++
 drivers/iommu/iommu.c |  3 +--
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index fce7ad81206f..f554328528bc 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -273,6 +273,16 @@ static inline bool iommu_is_dma_domain(struct iommu_domain *domain)
 	return domain->type & __IOMMU_DOMAIN_DMA_API;
 }
 
+static inline void
+iommu_domain_set_iopf_handler(struct iommu_domain *domain,
+		enum iommu_page_response_code (*handler)(struct iommu_fault *fault,
+							 void *data),
+		void *data)
+{
+	domain->iopf_handler = handler;
+	domain->fault_data = data;
+}
+
 enum iommu_cap {
 	IOMMU_CAP_CACHE_COHERENCY,	/* IOMMU_CACHE is supported */
 	IOMMU_CAP_NOEXEC,		/* IOMMU_NOEXEC flag */
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 13a2e0e26884..fd65ed1d3642 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -3419,8 +3419,7 @@ struct iommu_domain *iommu_sva_domain_alloc(struct device *dev,
 	domain->type = IOMMU_DOMAIN_SVA;
 	mmgrab(mm);
 	domain->mm = mm;
-	domain->iopf_handler = iommu_sva_handle_iopf;
-	domain->fault_data = mm;
+	iommu_domain_set_iopf_handler(domain, iommu_sva_handle_iopf, mm);
 
 	return domain;
 }
-- 
2.34.1