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Current File : /usr/include/linux/mic_common.h
/* 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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * 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_VIRTIO_RING_ALIGN		4096

#define MIC_MAX_VRINGS			4
#define MIC_VRING_ENTRIES		128

/*
 * Max vring entries (power of 2) to ensure desc and avail rings
 * fit in a single page
 */
#define MIC_MAX_VRING_ENTRIES		128

/**
 * 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
 */
#define MIC_MAX_DESC_BLK_SIZE		256

/**
 * 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)

#ifndef INTEL_MIC_CARD
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);
}
#endif

/* Device page size */
#define MIC_DP_SIZE 4096

#define MIC_MAGIC 0xc0ffee00

/**
 * enum mic_states - MIC states.
 */
enum mic_states {
	MIC_READY = 0,
	MIC_BOOTING,
	MIC_ONLINE,
	MIC_SHUTTING_DOWN,
	MIC_RESETTING,
	MIC_RESET_FAILED,
	MIC_LAST
};

/**
 * 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,
	MIC_CRASHED,
	MIC_HALTED,
	MIC_POWER_OFF,
	MIC_RESTART,
	MIC_STATUS_LAST
};

#endif

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