Commit 7c1ae151 authored by Yishai Hadas's avatar Yishai Hadas Committed by Alex Williamson
Browse files

virtio_pci: Introduce device parts access commands 



Introduce device parts access commands via the admin queue.

These commands and their structure adhere to the Virtio 1.4
specification.

Acked-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarYishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/20241113115200.209269-2-yishaih@nvidia.com


Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent a13bf78f

include/uapi/linux/virtio_pci.h

+131 −0
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ 
#define _LINUX_VIRTIO_PCI_H



#include <linux/types.h>

#include <linux/kernel.h>



#ifndef VIRTIO_PCI_NO_LEGACY
@@ -240,6 +241,17 @@ struct virtio_pci_cfg_cap { 
#define VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_READ		0x5

#define VIRTIO_ADMIN_CMD_LEGACY_NOTIFY_INFO		0x6



/* Device parts access commands. */

#define VIRTIO_ADMIN_CMD_CAP_ID_LIST_QUERY		0x7

#define VIRTIO_ADMIN_CMD_DEVICE_CAP_GET			0x8

#define VIRTIO_ADMIN_CMD_DRIVER_CAP_SET			0x9

#define VIRTIO_ADMIN_CMD_RESOURCE_OBJ_CREATE		0xa

#define VIRTIO_ADMIN_CMD_RESOURCE_OBJ_DESTROY		0xd

#define VIRTIO_ADMIN_CMD_DEV_PARTS_METADATA_GET		0xe

#define VIRTIO_ADMIN_CMD_DEV_PARTS_GET			0xf

#define VIRTIO_ADMIN_CMD_DEV_PARTS_SET			0x10

#define VIRTIO_ADMIN_CMD_DEV_MODE_SET			0x11



struct virtio_admin_cmd_hdr {

	__le16 opcode;

	/*
@@ -286,4 +298,123 @@ struct virtio_admin_cmd_notify_info_result { 
	struct virtio_admin_cmd_notify_info_data entries[VIRTIO_ADMIN_CMD_MAX_NOTIFY_INFO];

};



#define VIRTIO_DEV_PARTS_CAP 0x0000



struct virtio_dev_parts_cap {

	__u8 get_parts_resource_objects_limit;

	__u8 set_parts_resource_objects_limit;

};



#define MAX_CAP_ID __KERNEL_DIV_ROUND_UP(VIRTIO_DEV_PARTS_CAP + 1, 64)



struct virtio_admin_cmd_query_cap_id_result {

	__le64 supported_caps[MAX_CAP_ID];

};



struct virtio_admin_cmd_cap_get_data {

	__le16 id;

	__u8 reserved[6];

};



struct virtio_admin_cmd_cap_set_data {

	__le16 id;

	__u8 reserved[6];

	__u8 cap_specific_data[];

};



struct virtio_admin_cmd_resource_obj_cmd_hdr {

	__le16 type;

	__u8 reserved[2];

	__le32 id; /* Indicates unique resource object id per resource object type */

};



struct virtio_admin_cmd_resource_obj_create_data {

	struct virtio_admin_cmd_resource_obj_cmd_hdr hdr;

	__le64 flags;

	__u8 resource_obj_specific_data[];

};



#define VIRTIO_RESOURCE_OBJ_DEV_PARTS 0



#define VIRTIO_RESOURCE_OBJ_DEV_PARTS_TYPE_GET 0

#define VIRTIO_RESOURCE_OBJ_DEV_PARTS_TYPE_SET 1



struct virtio_resource_obj_dev_parts {

	__u8 type;

	__u8 reserved[7];

};



#define VIRTIO_ADMIN_CMD_DEV_PARTS_METADATA_TYPE_SIZE 0

#define VIRTIO_ADMIN_CMD_DEV_PARTS_METADATA_TYPE_COUNT 1

#define VIRTIO_ADMIN_CMD_DEV_PARTS_METADATA_TYPE_LIST 2



struct virtio_admin_cmd_dev_parts_metadata_data {

	struct virtio_admin_cmd_resource_obj_cmd_hdr hdr;

	__u8 type;

	__u8 reserved[7];

};



#define VIRTIO_DEV_PART_F_OPTIONAL 0



struct virtio_dev_part_hdr {

	__le16 part_type;

	__u8 flags;

	__u8 reserved;

	union {

		struct {

			__le32 offset;

			__le32 reserved;

		} pci_common_cfg;

		struct {

			__le16 index;

			__u8 reserved[6];

		} vq_index;

	} selector;

	__le32 length;

};



struct virtio_dev_part {

	struct virtio_dev_part_hdr hdr;

	__u8 value[];

};



struct virtio_admin_cmd_dev_parts_metadata_result {

	union {

		struct {

			__le32 size;

			__le32 reserved;

		} parts_size;

		struct {

			__le32 count;

			__le32 reserved;

		} hdr_list_count;

		struct {

			__le32 count;

			__le32 reserved;

			struct virtio_dev_part_hdr hdrs[];

		} hdr_list;

	};

};



#define VIRTIO_ADMIN_CMD_DEV_PARTS_GET_TYPE_SELECTED 0

#define VIRTIO_ADMIN_CMD_DEV_PARTS_GET_TYPE_ALL 1



struct virtio_admin_cmd_dev_parts_get_data {

	struct virtio_admin_cmd_resource_obj_cmd_hdr hdr;

	__u8 type;

	__u8 reserved[7];

	struct virtio_dev_part_hdr hdr_list[];

};



struct virtio_admin_cmd_dev_parts_set_data {

	struct virtio_admin_cmd_resource_obj_cmd_hdr hdr;

	struct virtio_dev_part parts[];

};



#define VIRTIO_ADMIN_CMD_DEV_MODE_F_STOPPED 0



struct virtio_admin_cmd_dev_mode_set_data {

	__u8 flags;

};



#endif