linux-kernel - [PATCH v3 2/5] iommu/sva: Move PASID helpers to sva code

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Date:   Thu, 16 Feb 2023 15:59:48 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     LKML <linux-kernel@...r.kernel.org>, iommu@...ts.linux.dev,
        Jason Gunthorpe <jgg@...dia.com>,
        "Lu Baolu" <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
Cc:     "Robin Murphy" <robin.murphy@....com>,
        "Will Deacon" <will@...nel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Raj Ashok <ashok.raj@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>, Yi Liu <yi.l.liu@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        X86 Kernel <x86@...nel.org>, Dave Jiang <dave.jiang@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v3 2/5] iommu/sva: Move PASID helpers to sva code

Preparing to remove IOASID infrastructure, PASID management will be
under SVA code.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 drivers/iommu/iommu-sva.c | 19 +++++++++++++++++++
 include/linux/sched/mm.h  | 22 +++-------------------
 2 files changed, 22 insertions(+), 19 deletions(-)

diff --git a/drivers/iommu/iommu-sva.c b/drivers/iommu/iommu-sva.c
index 24bf9b2b58aa..a3ee258936f0 100644
--- a/drivers/iommu/iommu-sva.c
+++ b/drivers/iommu/iommu-sva.c
@@ -71,6 +71,25 @@ struct mm_struct *iommu_sva_find(ioasid_t pasid)
 }
 EXPORT_SYMBOL_GPL(iommu_sva_find);
 
+void mm_pasid_init(struct mm_struct *mm)
+{
+	mm->pasid = INVALID_IOASID;
+}
+
+/* Associate a PASID with an mm_struct: */
+void mm_pasid_set(struct mm_struct *mm, u32 pasid)
+{
+	mm->pasid = pasid;
+}
+
+void mm_pasid_drop(struct mm_struct *mm)
+{
+	if (pasid_valid(mm->pasid)) {
+		ioasid_free(mm->pasid);
+		mm->pasid = INVALID_IOASID;
+	}
+}
+
 /**
  * iommu_sva_bind_device() - Bind a process address space to a device
  * @dev: the device
diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index 2a243616f222..c488c7241102 100644
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -8,7 +8,6 @@
 #include <linux/mm_types.h>
 #include <linux/gfp.h>
 #include <linux/sync_core.h>
-#include <linux/ioasid.h>
 
 /*
  * Routines for handling mm_structs
@@ -452,24 +451,9 @@ static inline void membarrier_update_current_mm(struct mm_struct *next_mm)
 #endif
 
 #ifdef CONFIG_IOMMU_SVA
-static inline void mm_pasid_init(struct mm_struct *mm)
-{
-	mm->pasid = INVALID_IOASID;
-}
-
-/* Associate a PASID with an mm_struct: */
-static inline void mm_pasid_set(struct mm_struct *mm, u32 pasid)
-{
-	mm->pasid = pasid;
-}
-
-static inline void mm_pasid_drop(struct mm_struct *mm)
-{
-	if (pasid_valid(mm->pasid)) {
-		ioasid_free(mm->pasid);
-		mm->pasid = INVALID_IOASID;
-	}
-}
+void mm_pasid_init(struct mm_struct *mm);
+void mm_pasid_set(struct mm_struct *mm, u32 pasid);
+void mm_pasid_drop(struct mm_struct *mm);
 #else
 static inline void mm_pasid_init(struct mm_struct *mm) {}
 static inline void mm_pasid_set(struct mm_struct *mm, u32 pasid) {}
-- 
2.25.1