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From:   Tina Zhang <tina.zhang@intel.com>
To:     Jason Gunthorpe <jgg@ziepe.ca>, Kevin Tian <kevin.tian@intel.com>,
        Lu Baolu <baolu.lu@linux.intel.com>,
        Michael Shavit <mshavit@google.com>
Cc:     iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
        Tina Zhang <tina.zhang@intel.com>
Subject: [PATCH 1/5] iommu: Add mm_get_pasid() helper function
Date:   Tue,  8 Aug 2023 15:49:40 +0800
Message-Id: <20230808074944.7825-2-tina.zhang@intel.com>
In-Reply-To: <20230808074944.7825-1-tina.zhang@intel.com>
References: <20230808074944.7825-1-tina.zhang@intel.com>
Precedence: bulk

mm_get_pasid() is for getting mm pasid value.

The motivation is to replace mm->pasid with an iommu private data
structure that is introduced in a later patch.

Signed-off-by: Tina Zhang <tina.zhang@intel.com>
---
 arch/x86/kernel/traps.c | 2 +-
 include/linux/iommu.h   | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 4a817d20ce3b..6e259b11cd87 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -678,7 +678,7 @@ static bool try_fixup_enqcmd_gp(void)
 	if (!mm_valid_pasid(current->mm))
 		return false;
 
-	pasid = current->mm->pasid;
+	pasid = mm_get_pasid(current->mm);
 
 	/*
 	 * Did this thread already have its PASID activated?
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index d31642596675..30e4d1ca39b5 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -1180,6 +1180,10 @@ static inline bool mm_valid_pasid(struct mm_struct *mm)
 {
 	return mm->pasid != IOMMU_PASID_INVALID;
 }
+static inline u32 mm_get_pasid(struct mm_struct *mm)
+{
+	return mm->pasid;
+}
 void mm_pasid_drop(struct mm_struct *mm);
 struct iommu_sva *iommu_sva_bind_device(struct device *dev,
 					struct mm_struct *mm);
@@ -1202,6 +1206,10 @@ static inline u32 iommu_sva_get_pasid(struct iommu_sva *handle)
 }
 static inline void mm_pasid_init(struct mm_struct *mm) {}
 static inline bool mm_valid_pasid(struct mm_struct *mm) { return false; }
+static inline u32 mm_get_pasid(struct mm_struct *mm)
+{
+	return IOMMU_PASID_INVALID;
+}
 static inline void mm_pasid_drop(struct mm_struct *mm) {}
 #endif /* CONFIG_IOMMU_SVA */
 
-- 
2.17.1