--- /dev/null
+/* 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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