linux-kernel - [PATCH 1/2] iommu: Report domain nesting info for arm-smmu-v3

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Date:   Fri, 12 Feb 2021 16:28:58 +0530
From:   Vivek Gautam <vivek.gautam@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org,
        virtualization@...ts.linux-foundation.org
Cc:     joro@...tes.org, will.deacon@....com, mst@...hat.com,
        robin.murphy@....com, jean-philippe@...aro.org,
        eric.auger@...hat.com, alex.williamson@...hat.com,
        kevin.tian@...el.com, jacob.jun.pan@...ux.intel.com,
        yi.l.liu@...el.com, Lorenzo.Pieralisi@....com,
        shameerali.kolothum.thodi@...wei.com
Subject: [PATCH 1/2] iommu: Report domain nesting info for arm-smmu-v3

Add a vendor specific structure for domain nesting info for
arm smmu-v3, and necessary info fields required to populate
stage1 page tables.

Signed-off-by: Vivek Gautam <vivek.gautam@....com>
---
 include/uapi/linux/iommu.h | 31 +++++++++++++++++++++++++------
 1 file changed, 25 insertions(+), 6 deletions(-)

diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
index 4d3d988fa353..5f059bcf7720 100644
--- a/include/uapi/linux/iommu.h
+++ b/include/uapi/linux/iommu.h
@@ -323,7 +323,8 @@ struct iommu_gpasid_bind_data {
 #define IOMMU_GPASID_BIND_VERSION_1	1
 	__u32 version;
 #define IOMMU_PASID_FORMAT_INTEL_VTD	1
-#define IOMMU_PASID_FORMAT_LAST		2
+#define IOMMU_PASID_FORMAT_ARM_SMMU_V3	2
+#define IOMMU_PASID_FORMAT_LAST		3
 	__u32 format;
 	__u32 addr_width;
 #define IOMMU_SVA_GPASID_VAL	(1 << 0) /* guest PASID valid */
@@ -409,6 +410,21 @@ struct iommu_nesting_info_vtd {
 	__u64	ecap_reg;
 };
 
+/*
+ * struct iommu_nesting_info_arm_smmuv3 - Arm SMMU-v3 nesting info.
+ */
+struct iommu_nesting_info_arm_smmuv3 {
+	__u32	flags;
+	__u16	asid_bits;
+
+	/* Arm LPAE page table format as per kernel */
+#define ARM_PGTBL_32_LPAE_S1		(0x0)
+#define ARM_PGTBL_64_LPAE_S1		(0x2)
+	__u8	pgtbl_fmt;
+
+	__u8	padding[9];
+};
+
 /*
  * struct iommu_nesting_info - Information for nesting-capable IOMMU.
  *			       userspace should check it before using
@@ -445,11 +461,13 @@ struct iommu_nesting_info_vtd {
  * +---------------+------------------------------------------------------+
  *
  * data struct types defined for @format:
- * +================================+=====================================+
- * | @format                        | data struct                         |
- * +================================+=====================================+
- * | IOMMU_PASID_FORMAT_INTEL_VTD   | struct iommu_nesting_info_vtd       |
- * +--------------------------------+-------------------------------------+
+ * +================================+======================================+
+ * | @format                        | data struct                          |
+ * +================================+======================================+
+ * | IOMMU_PASID_FORMAT_INTEL_VTD   | struct iommu_nesting_info_vtd        |
+ * +---------------+-------------------------------------------------------+
+ * | IOMMU_PASID_FORMAT_ARM_SMMU_V3 | struct iommu_nesting_info_arm_smmuv3 |
+ * +--------------------------------+--------------------------------------+
  *
  */
 struct iommu_nesting_info {
@@ -466,6 +484,7 @@ struct iommu_nesting_info {
 	/* Vendor specific data */
 	union {
 		struct iommu_nesting_info_vtd vtd;
+		struct iommu_nesting_info_arm_smmuv3 smmuv3;
 	} vendor;
 };
 
-- 
2.17.1