[RFC v4 01/11] uapi: align VDUSE header for ASID

["Eugenio Pérez" <eperezma@redhat.com>]

Add all the ioctls and argument struct definitions so we can call them
in next patches.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 kernel/linux/uapi/linux/vduse.h | 93 +++++++++++++++++++++++++++++----
 1 file changed, 84 insertions(+), 9 deletions(-)

diff --git a/kernel/linux/uapi/linux/vduse.h b/kernel/linux/uapi/linux/vduse.h
index f46269af349a..361eea511c21 100644
--- a/kernel/linux/uapi/linux/vduse.h
+++ b/kernel/linux/uapi/linux/vduse.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
-#ifndef _VDUSE_H_
-#define _VDUSE_H_
+#ifndef _UAPI_VDUSE_H_
+#define _UAPI_VDUSE_H_
 
 #include <linux/types.h>
 
@@ -10,6 +10,10 @@
 
 #define VDUSE_API_VERSION	0
 
+/* VQ groups and ASID support */
+
+#define VDUSE_API_VERSION_1	1
+
 /*
  * Get the version of VDUSE API that kernel supported (VDUSE_API_VERSION).
  * This is used for future extension.
@@ -27,6 +31,8 @@
  * @features: virtio features
  * @vq_num: the number of virtqueues
  * @vq_align: the allocation alignment of virtqueue's metadata
+ * @ngroups: number of vq groups that VDUSE device declares
+ * @nas: number of address spaces that VDUSE device declares
  * @reserved: for future use, needs to be initialized to zero
  * @config_size: the size of the configuration space
  * @config: the buffer of the configuration space
@@ -41,7 +47,9 @@ struct vduse_dev_config {
 	__u64 features;
 	__u32 vq_num;
 	__u32 vq_align;
-	__u32 reserved[13];
+	__u32 ngroups; /* if VDUSE_API_VERSION >= 1 */
+	__u32 nas; /* if VDUSE_API_VERSION >= 1 */
+	__u32 reserved[11];
 	__u32 config_size;
 	__u8 config[];
 };
@@ -118,14 +126,18 @@ struct vduse_config_data {
  * struct vduse_vq_config - basic configuration of a virtqueue
  * @index: virtqueue index
  * @max_size: the max size of virtqueue
- * @reserved: for future use, needs to be initialized to zero
+ * @reserved1: for future use, needs to be initialized to zero
+ * @group: virtqueue group
+ * @reserved2: for future use, needs to be initialized to zero
  *
  * Structure used by VDUSE_VQ_SETUP ioctl to setup a virtqueue.
  */
 struct vduse_vq_config {
 	__u32 index;
 	__u16 max_size;
-	__u16 reserved[13];
+	__u16 reserved1;
+	__u32 group;
+	__u16 reserved2[10];
 };
 
 /*
@@ -156,6 +168,16 @@ struct vduse_vq_state_packed {
 	__u16 last_used_idx;
 };
 
+/**
+ * struct vduse_vq_group_asid - virtqueue group ASID
+ * @group: Index of the virtqueue group
+ * @asid: Address space ID of the group
+ */
+struct vduse_vq_group_asid {
+	__u32 group;
+	__u32 asid;
+};
+
 /**
  * struct vduse_vq_info - information of a virtqueue
  * @index: virtqueue index
@@ -215,6 +237,7 @@ struct vduse_vq_eventfd {
  * @uaddr: start address of userspace memory, it must be aligned to page size
  * @iova: start of the IOVA region
  * @size: size of the IOVA region
+ * @asid: Address space ID of the IOVA region
  * @reserved: for future use, needs to be initialized to zero
  *
  * Structure used by VDUSE_IOTLB_REG_UMEM and VDUSE_IOTLB_DEREG_UMEM
@@ -224,7 +247,8 @@ struct vduse_iova_umem {
 	__u64 uaddr;
 	__u64 iova;
 	__u64 size;
-	__u64 reserved[3];
+	__u32 asid;
+	__u32 reserved[5];
 };
 
 /* Register userspace memory for IOVA regions */
@@ -237,7 +261,8 @@ struct vduse_iova_umem {
  * struct vduse_iova_info - information of one IOVA region
  * @start: start of the IOVA region
  * @last: last of the IOVA region
- * @capability: capability of the IOVA regsion
+ * @capability: capability of the IOVA region
+ * @asid: Address space ID of the IOVA region, only if device API version >= 1
  * @reserved: for future use, needs to be initialized to zero
  *
  * Structure used by VDUSE_IOTLB_GET_INFO ioctl to get information of
@@ -248,7 +273,8 @@ struct vduse_iova_info {
 	__u64 last;
 #define VDUSE_IOVA_CAP_UMEM (1 << 0)
 	__u64 capability;
-	__u64 reserved[3];
+	__u32 asid; /* Only if device API version >= 1 */
+	__u32 reserved[5];
 };
 
 /*
@@ -257,6 +283,32 @@ struct vduse_iova_info {
  */
 #define VDUSE_IOTLB_GET_INFO	_IOWR(VDUSE_BASE, 0x1a, struct vduse_iova_info)
 
+/**
+ * struct vduse_iotlb_entry_v2 - entry of IOTLB to describe one IOVA region
+ *
+ * @v1: the original vduse_iotlb_entry
+ * @asid: address space ID of the IOVA region
+ * @reserved: for future use, needs to be initialized to zero
+ *
+ * Structure used by VDUSE_IOTLB_GET_FD2 ioctl to find an overlapped IOVA region.
+ */
+struct vduse_iotlb_entry_v2 {
+	__u64 offset;
+	__u64 start;
+	__u64 last;
+	__u8 perm;
+	__u8 padding[7];
+	__u32 asid;
+	__u32 reserved[11];
+};
+
+/*
+ * Same as VDUSE_IOTLB_GET_FD but with vduse_iotlb_entry_v2 argument that
+ * support extra fields.
+ */
+#define VDUSE_IOTLB_GET_FD2	_IOWR(VDUSE_BASE, 0x1b, struct vduse_iotlb_entry_v2)
+
+
 /* The control messages definition for read(2)/write(2) on /dev/vduse/$NAME */
 
 /**
@@ -265,11 +317,14 @@ struct vduse_iova_info {
  * @VDUSE_SET_STATUS: set the device status
  * @VDUSE_UPDATE_IOTLB: Notify userspace to update the memory mapping for
  *                      specified IOVA range via VDUSE_IOTLB_GET_FD ioctl
+ * @VDUSE_SET_VQ_GROUP_ASID: Notify userspace to update the address space of a
+ *                           virtqueue group.
  */
 enum vduse_req_type {
 	VDUSE_GET_VQ_STATE,
 	VDUSE_SET_STATUS,
 	VDUSE_UPDATE_IOTLB,
+	VDUSE_SET_VQ_GROUP_ASID,
 };
 
 /**
@@ -304,6 +359,19 @@ struct vduse_iova_range {
 	__u64 last;
 };
 
+/**
+ * struct vduse_iova_range_v2 - IOVA range [start, last] if API_VERSION >= 1
+ * @start: start of the IOVA range
+ * @last: last of the IOVA range
+ * @asid: address space ID of the IOVA range
+ */
+struct vduse_iova_range_v2 {
+	__u64 start;
+	__u64 last;
+	__u32 asid;
+	__u32 padding;
+};
+
 /**
  * struct vduse_dev_request - control request
  * @type: request type
@@ -312,6 +380,8 @@ struct vduse_iova_range {
  * @vq_state: virtqueue state, only index field is available
  * @s: device status
  * @iova: IOVA range for updating
+ * @iova_v2: IOVA range for updating if API_VERSION >= 1
+ * @vq_group_asid: ASID of a virtqueue group
  * @padding: padding
  *
  * Structure used by read(2) on /dev/vduse/$NAME.
@@ -324,6 +394,11 @@ struct vduse_dev_request {
 		struct vduse_vq_state vq_state;
 		struct vduse_dev_status s;
 		struct vduse_iova_range iova;
+		/* Following members but padding exist only if vduse api
+		 * version >= 1
+		 */
+		struct vduse_iova_range_v2 iova_v2;
+		struct vduse_vq_group_asid vq_group_asid;
 		__u32 padding[32];
 	};
 };
@@ -350,4 +425,4 @@ struct vduse_dev_response {
 	};
 };
 
-#endif /* _VDUSE_H_ */
+#endif /* _UAPI_VDUSE_H_ */
-- 
2.55.0