236 lines
6.3 KiB
C
236 lines
6.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Intel MIC Platform Software Stack (MPSS)
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*
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* Copyright(c) 2013 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*
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* Intel MIC driver.
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*
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*/
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#ifndef __MIC_COMMON_H_
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#define __MIC_COMMON_H_
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#include <linux/virtio_ring.h>
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#define __mic_align(a, x) (((a) + (x) - 1) & ~((x) - 1))
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/**
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* struct mic_device_desc: Virtio device information shared between the
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* virtio driver and userspace backend
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*
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* @type: Device type: console/network/disk etc. Type 0/-1 terminates.
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* @num_vq: Number of virtqueues.
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* @feature_len: Number of bytes of feature bits. Multiply by 2: one for
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host features and one for guest acknowledgements.
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* @config_len: Number of bytes of the config array after virtqueues.
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* @status: A status byte, written by the Guest.
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* @config: Start of the following variable length config.
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*/
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struct mic_device_desc {
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__s8 type;
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__u8 num_vq;
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__u8 feature_len;
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__u8 config_len;
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__u8 status;
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__le64 config[0];
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} __attribute__ ((aligned(8)));
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/**
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* struct mic_device_ctrl: Per virtio device information in the device page
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* used internally by the host and card side drivers.
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*
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* @vdev: Used for storing MIC vdev information by the guest.
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* @config_change: Set to 1 by host when a config change is requested.
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* @vdev_reset: Set to 1 by guest to indicate virtio device has been reset.
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* @guest_ack: Set to 1 by guest to ack a command.
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* @host_ack: Set to 1 by host to ack a command.
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* @used_address_updated: Set to 1 by guest when the used address should be
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* updated.
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* @c2h_vdev_db: The doorbell number to be used by guest. Set by host.
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* @h2c_vdev_db: The doorbell number to be used by host. Set by guest.
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*/
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struct mic_device_ctrl {
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__le64 vdev;
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__u8 config_change;
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__u8 vdev_reset;
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__u8 guest_ack;
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__u8 host_ack;
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__u8 used_address_updated;
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__s8 c2h_vdev_db;
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__s8 h2c_vdev_db;
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} __attribute__ ((aligned(8)));
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/**
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* struct mic_bootparam: Virtio device independent information in device page
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*
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* @magic: A magic value used by the card to ensure it can see the host
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* @h2c_config_db: Host to Card Virtio config doorbell set by card
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* @node_id: Unique id of the node
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* @h2c_scif_db - Host to card SCIF doorbell set by card
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* @c2h_scif_db - Card to host SCIF doorbell set by host
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* @scif_host_dma_addr - SCIF host queue pair DMA address
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* @scif_card_dma_addr - SCIF card queue pair DMA address
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*/
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struct mic_bootparam {
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__le32 magic;
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__s8 h2c_config_db;
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__u8 node_id;
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__u8 h2c_scif_db;
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__u8 c2h_scif_db;
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__u64 scif_host_dma_addr;
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__u64 scif_card_dma_addr;
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} __attribute__ ((aligned(8)));
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/**
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* struct mic_device_page: High level representation of the device page
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*
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* @bootparam: The bootparam structure is used for sharing information and
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* status updates between MIC host and card drivers.
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* @desc: Array of MIC virtio device descriptors.
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*/
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struct mic_device_page {
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struct mic_bootparam bootparam;
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struct mic_device_desc desc[0];
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};
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/**
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* struct mic_vqconfig: This is how we expect the device configuration field
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* for a virtqueue to be laid out in config space.
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*
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* @address: Guest/MIC physical address of the virtio ring
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* (avail and desc rings)
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* @used_address: Guest/MIC physical address of the used ring
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* @num: The number of entries in the virtio_ring
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*/
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struct mic_vqconfig {
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__le64 address;
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__le64 used_address;
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__le16 num;
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} __attribute__ ((aligned(8)));
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/*
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* The alignment to use between consumer and producer parts of vring.
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* This is pagesize for historical reasons.
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*/
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#define MIC_VIRTIO_RING_ALIGN 4096
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#define MIC_MAX_VRINGS 4
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#define MIC_VRING_ENTRIES 128
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/*
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* Max vring entries (power of 2) to ensure desc and avail rings
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* fit in a single page
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*/
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#define MIC_MAX_VRING_ENTRIES 128
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/**
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* Max size of the desc block in bytes: includes:
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* - struct mic_device_desc
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* - struct mic_vqconfig (num_vq of these)
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* - host and guest features
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* - virtio device config space
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*/
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#define MIC_MAX_DESC_BLK_SIZE 256
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/**
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* struct _mic_vring_info - Host vring info exposed to userspace backend
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* for the avail index and magic for the card.
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*
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* @avail_idx: host avail idx
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* @magic: A magic debug cookie.
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*/
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struct _mic_vring_info {
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__u16 avail_idx;
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__le32 magic;
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};
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/**
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* struct mic_vring - Vring information.
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*
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* @vr: The virtio ring.
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* @info: Host vring information exposed to the userspace backend for the
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* avail index and magic for the card.
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* @va: The va for the buffer allocated for vr and info.
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* @len: The length of the buffer required for allocating vr and info.
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*/
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struct mic_vring {
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struct vring vr;
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struct _mic_vring_info *info;
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void *va;
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int len;
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};
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#define mic_aligned_desc_size(d) __mic_align(mic_desc_size(d), 8)
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#ifndef INTEL_MIC_CARD
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static inline unsigned mic_desc_size(const struct mic_device_desc *desc)
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{
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return sizeof(*desc) + desc->num_vq * sizeof(struct mic_vqconfig)
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+ desc->feature_len * 2 + desc->config_len;
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}
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static inline struct mic_vqconfig *
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mic_vq_config(const struct mic_device_desc *desc)
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{
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return (struct mic_vqconfig *)(desc + 1);
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}
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static inline __u8 *mic_vq_features(const struct mic_device_desc *desc)
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{
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return (__u8 *)(mic_vq_config(desc) + desc->num_vq);
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}
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static inline __u8 *mic_vq_configspace(const struct mic_device_desc *desc)
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{
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return mic_vq_features(desc) + desc->feature_len * 2;
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}
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static inline unsigned mic_total_desc_size(struct mic_device_desc *desc)
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{
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return mic_aligned_desc_size(desc) + sizeof(struct mic_device_ctrl);
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}
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#endif
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/* Device page size */
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#define MIC_DP_SIZE 4096
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#define MIC_MAGIC 0xc0ffee00
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/**
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* enum mic_states - MIC states.
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*/
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enum mic_states {
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MIC_READY = 0,
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MIC_BOOTING,
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MIC_ONLINE,
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MIC_SHUTTING_DOWN,
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MIC_RESETTING,
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MIC_RESET_FAILED,
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MIC_LAST
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};
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/**
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* enum mic_status - MIC status reported by card after
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* a host or card initiated shutdown or a card crash.
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*/
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enum mic_status {
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MIC_NOP = 0,
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MIC_CRASHED,
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MIC_HALTED,
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MIC_POWER_OFF,
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MIC_RESTART,
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MIC_STATUS_LAST
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};
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#endif
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