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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
* Intel MIC Platform Software Stack (MPSS)
* Copyright(c) 2013 Intel Corporation.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* General Public License for more details.
* The full GNU General Public License is included in this distribution in
* the file called "COPYING".
* Intel MIC driver.
#ifndef __MIC_COMMON_H_
#define __MIC_COMMON_H_
#include <linux/virtio_ring.h>
#define __mic_align(a, x) (((a) + (x) - 1) & ~((x) - 1))
* struct mic_device_desc: Virtio device information shared between the
* virtio driver and userspace backend
* @type: Device type: console/network/disk etc. Type 0/-1 terminates.
* @num_vq: Number of virtqueues.
* @feature_len: Number of bytes of feature bits. Multiply by 2: one for
host features and one for guest acknowledgements.
* @config_len: Number of bytes of the config array after virtqueues.
* @status: A status byte, written by the Guest.
* @config: Start of the following variable length config.
struct mic_device_desc {
__s8 type;
__u8 num_vq;
__u8 feature_len;
__u8 config_len;
__u8 status;
__le64 config[0];
} __attribute__ ((aligned(8)));
* struct mic_device_ctrl: Per virtio device information in the device page
* used internally by the host and card side drivers.
* @vdev: Used for storing MIC vdev information by the guest.
* @config_change: Set to 1 by host when a config change is requested.
* @vdev_reset: Set to 1 by guest to indicate virtio device has been reset.
* @guest_ack: Set to 1 by guest to ack a command.
* @host_ack: Set to 1 by host to ack a command.
* @used_address_updated: Set to 1 by guest when the used address should be
* updated.
* @c2h_vdev_db: The doorbell number to be used by guest. Set by host.
* @h2c_vdev_db: The doorbell number to be used by host. Set by guest.
struct mic_device_ctrl {
__le64 vdev;
__u8 config_change;
__u8 vdev_reset;
__u8 guest_ack;
__u8 host_ack;
__u8 used_address_updated;
__s8 c2h_vdev_db;
__s8 h2c_vdev_db;
} __attribute__ ((aligned(8)));
* struct mic_bootparam: Virtio device independent information in device page
* @magic: A magic value used by the card to ensure it can see the host
* @h2c_config_db: Host to Card Virtio config doorbell set by card
* @node_id: Unique id of the node
* @h2c_scif_db - Host to card SCIF doorbell set by card
* @c2h_scif_db - Card to host SCIF doorbell set by host
* @scif_host_dma_addr - SCIF host queue pair DMA address
* @scif_card_dma_addr - SCIF card queue pair DMA address
struct mic_bootparam {
__le32 magic;
__s8 h2c_config_db;
__u8 node_id;
__u8 h2c_scif_db;
__u8 c2h_scif_db;
__u64 scif_host_dma_addr;
__u64 scif_card_dma_addr;
} __attribute__ ((aligned(8)));
* struct mic_device_page: High level representation of the device page
* @bootparam: The bootparam structure is used for sharing information and
* status updates between MIC host and card drivers.
* @desc: Array of MIC virtio device descriptors.
struct mic_device_page {
struct mic_bootparam bootparam;
struct mic_device_desc desc[0];
* struct mic_vqconfig: This is how we expect the device configuration field
* for a virtqueue to be laid out in config space.
* @address: Guest/MIC physical address of the virtio ring
* (avail and desc rings)
* @used_address: Guest/MIC physical address of the used ring
* @num: The number of entries in the virtio_ring
struct mic_vqconfig {
__le64 address;
__le64 used_address;
__le16 num;
} __attribute__ ((aligned(8)));
* The alignment to use between consumer and producer parts of vring.
* This is pagesize for historical reasons.
#define MIC_MAX_VRINGS 4
* Max vring entries (power of 2) to ensure desc and avail rings
* fit in a single page
* Max size of the desc block in bytes: includes:
* - struct mic_device_desc
* - struct mic_vqconfig (num_vq of these)
* - host and guest features
* - virtio device config space
* struct _mic_vring_info - Host vring info exposed to userspace backend
* for the avail index and magic for the card.
* @avail_idx: host avail idx
* @magic: A magic debug cookie.
struct _mic_vring_info {
__u16 avail_idx;
__le32 magic;
* struct mic_vring - Vring information.
* @vr: The virtio ring.
* @info: Host vring information exposed to the userspace backend for the
* avail index and magic for the card.
* @va: The va for the buffer allocated for vr and info.
* @len: The length of the buffer required for allocating vr and info.
struct mic_vring {
struct vring vr;
struct _mic_vring_info *info;
void *va;
int len;
#define mic_aligned_desc_size(d) __mic_align(mic_desc_size(d), 8)
static inline unsigned mic_desc_size(const struct mic_device_desc *desc)
return sizeof(*desc) + desc->num_vq * sizeof(struct mic_vqconfig)
+ desc->feature_len * 2 + desc->config_len;
static inline struct mic_vqconfig *
mic_vq_config(const struct mic_device_desc *desc)
return (struct mic_vqconfig *)(desc + 1);
static inline __u8 *mic_vq_features(const struct mic_device_desc *desc)
return (__u8 *)(mic_vq_config(desc) + desc->num_vq);
static inline __u8 *mic_vq_configspace(const struct mic_device_desc *desc)
return mic_vq_features(desc) + desc->feature_len * 2;
static inline unsigned mic_total_desc_size(struct mic_device_desc *desc)
return mic_aligned_desc_size(desc) + sizeof(struct mic_device_ctrl);
/* Device page size */
#define MIC_DP_SIZE 4096
#define MIC_MAGIC 0xc0ffee00
* enum mic_states - MIC states.
enum mic_states {
* enum mic_status - MIC status reported by card after
* a host or card initiated shutdown or a card crash.
enum mic_status {
MIC_NOP = 0,