linux-kernel - [RFC PATCH 3/6] iommu: Introduce struct iommu_mm

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Date:   Fri,  7 Jul 2023 09:34:38 +0800
From:   Tina Zhang <tina.zhang@...el.com>
To:     Jason Gunthorpe <jgg@...pe.ca>, Kevin Tian <kevin.tian@...el.com>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Michael Shavit <mshavit@...gle.com>
Cc:     iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Tina Zhang <tina.zhang@...el.com>
Subject: [RFC PATCH 3/6] iommu: Introduce struct iommu_mm_data

To make sva domain 1:1 with mm pasid, mm needs to keep reference to the
sva domain as well as keeping the information of mm pasid. Introduce
struct iommu_mm_data to wrap the information up.

When a process is created, the mm pasid is initialized as IOMMU_PASID_
INVALID. The default_iommu_mms is introduced to initialize an mm pasid
with that default value.

Signed-off-by: Tina Zhang <tina.zhang@...el.com>
---
 drivers/iommu/iommu.c | 2 ++
 include/linux/iommu.h | 7 +++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index f1dcfa3f1a1b4..35fa1c1b12826 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -83,6 +83,8 @@ static const char * const iommu_group_resv_type_string[] = {
 	[IOMMU_RESV_SW_MSI]			= "msi",
 };
 
+struct iommu_mm_data default_iommu_mm = { IOMMU_PASID_INVALID, NULL };
+
 #define IOMMU_CMD_LINE_DMA_API		BIT(0)
 #define IOMMU_CMD_LINE_STRICT		BIT(1)
 
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index d39e647219eb8..20135912584ba 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -42,6 +42,8 @@ struct iommu_sva;
 struct iommu_fault_event;
 struct iommu_dma_cookie;
 
+extern struct iommu_mm_data default_iommu_mm;
+
 /* iommu fault flags */
 #define IOMMU_FAULT_READ	0x0
 #define IOMMU_FAULT_WRITE	0x1
@@ -664,6 +666,11 @@ struct iommu_sva {
 	struct iommu_domain		*domain;
 };
 
+struct iommu_mm_data {
+	u32                     pasid;
+	struct iommu_domain     *sva_domain;
+};
+
 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
 		      const struct iommu_ops *ops);
 void iommu_fwspec_free(struct device *dev);
-- 
2.34.1