drivers/misc/mic/scif/scif_nodeqp.h

   1 /*
   2  * Intel MIC Platform Software Stack (MPSS)
   3  *
   4  * This file is provided under a dual BSD/GPLv2 license.  When using or
   5  * redistributing this file, you may do so under either license.
   6  *
   7  * GPL LICENSE SUMMARY
   8  *
   9  * Copyright(c) 2014 Intel Corporation.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of version 2 of the GNU General Public License as
  13  * published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * BSD LICENSE
  21  *
  22  * Copyright(c) 2014 Intel Corporation.
  23  *
  24  * Redistribution and use in source and binary forms, with or without
  25  * modification, are permitted provided that the following conditions
  26  * are met:
  27  *
  28  * * Redistributions of source code must retain the above copyright
  29  *   notice, this list of conditions and the following disclaimer.
  30  * * Redistributions in binary form must reproduce the above copyright
  31  *   notice, this list of conditions and the following disclaimer in
  32  *   the documentation and/or other materials provided with the
  33  *   distribution.
  34  * * Neither the name of Intel Corporation nor the names of its
  35  *   contributors may be used to endorse or promote products derived
  36  *   from this software without specific prior written permission.
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  39  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  40  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  41  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  42  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  44  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  45  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  46  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  47  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  48  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  49  *
  50  * Intel SCIF driver.
  51  *
  52  */
  53 #ifndef SCIF_NODEQP
  54 #define SCIF_NODEQP
  55
  56 #include "scif_rb.h"
  57 #include "scif_peer_bus.h"
  58
  59 #define SCIF_INIT 1  /* First message sent to the peer node for discovery */
  60 #define SCIF_EXIT 2  /* Last message from the peer informing intent to exit */
  61 #define SCIF_EXIT_ACK 3 /* Response to SCIF_EXIT message */
  62 #define SCIF_NODE_ADD 4  /* Tell Online nodes a new node exits */
  63 #define SCIF_NODE_ADD_ACK 5  /* Confirm to mgmt node sequence is finished */
  64 #define SCIF_NODE_ADD_NACK 6 /* SCIF_NODE_ADD failed */
  65 #define SCIF_NODE_REMOVE 7 /* Request to deactivate a SCIF node */
  66 #define SCIF_NODE_REMOVE_ACK 8 /* Response to a SCIF_NODE_REMOVE message */
  67 #define SCIF_CNCT_REQ 9  /* Phys addr of Request connection to a port */
  68 #define SCIF_CNCT_GNT 10  /* Phys addr of new Grant connection request */
  69 #define SCIF_CNCT_GNTACK 11  /* Error type Reject a connection request */
  70 #define SCIF_CNCT_GNTNACK 12  /* Error type Reject a connection request */
  71 #define SCIF_CNCT_REJ 13  /* Error type Reject a connection request */
  72 #define SCIF_DISCNCT 14 /* Notify peer that connection is being terminated */
  73 #define SCIF_DISCNT_ACK 15 /* Notify peer that connection is being terminated */
  74 #define SCIF_CLIENT_SENT 16 /* Notify the peer that data has been written */
  75 #define SCIF_CLIENT_RCVD 17 /* Notify the peer that data has been read */
  76 #define SCIF_GET_NODE_INFO 18 /* Get current node mask from the mgmt node*/
  77 #define SCIF_MAX_MSG SCIF_GET_NODE_INFO
  78
  79 /*
  80  * struct scifmsg - Node QP message format
  81  *
  82  * @src: Source information
  83  * @dst: Destination information
  84  * @uop: The message opcode
  85  * @payload: Unique payload format for each message
  86  */
  87 struct scifmsg {
  88         struct scif_port_id src;
  89         struct scif_port_id dst;
  90         u32 uop;
  91         u64 payload[4];
  92 } __packed;
  93
  94 /*
  95  * struct scif_qp - Node Queue Pair
  96  *
  97  * Interesting structure -- a little difficult because we can only
  98  * write across the PCIe, so any r/w pointer we need to read is
  99  * local. We only need to read the read pointer on the inbound_q
 100  * and read the write pointer in the outbound_q
 101  *
 102  * @magic: Magic value to ensure the peer sees the QP correctly
 103  * @outbound_q: The outbound ring buffer for sending messages
 104  * @inbound_q: The inbound ring buffer for receiving messages
 105  * @local_write: Local write index
 106  * @local_read: Local read index
 107  * @remote_qp: The remote queue pair
 108  * @local_buf: DMA address of local ring buffer
 109  * @local_qp: DMA address of the local queue pair data structure
 110  * @remote_buf: DMA address of remote ring buffer
 111  * @qp_state: QP state i.e. online or offline used for P2P
 112  * @send_lock: synchronize access to outbound queue
 113  * @recv_lock: Synchronize access to inbound queue
 114  */
 115 struct scif_qp {
 116         u64 magic;
 117 #define SCIFEP_MAGIC 0x5c1f000000005c1fULL
 118         struct scif_rb outbound_q;
 119         struct scif_rb inbound_q;
 120
 121         u32 local_write __aligned(64);
 122         u32 local_read __aligned(64);
 123         struct scif_qp *remote_qp;
 124         dma_addr_t local_buf;
 125         dma_addr_t local_qp;
 126         dma_addr_t remote_buf;
 127         u32 qp_state;
 128 #define SCIF_QP_OFFLINE 0xdead
 129 #define SCIF_QP_ONLINE 0xc0de
 130         spinlock_t send_lock;
 131         spinlock_t recv_lock;
 132 };
 133
 134 /*
 135  * struct scif_loopb_msg - An element in the loopback Node QP message list.
 136  *
 137  * @msg - The SCIF node QP message
 138  * @list - link in the list of messages
 139  */
 140 struct scif_loopb_msg {
 141         struct scifmsg msg;
 142         struct list_head list;
 143 };
 144
 145 int scif_nodeqp_send(struct scif_dev *scifdev, struct scifmsg *msg);
 146 int _scif_nodeqp_send(struct scif_dev *scifdev, struct scifmsg *msg);
 147 void scif_nodeqp_intrhandler(struct scif_dev *scifdev, struct scif_qp *qp);
 148 int scif_loopb_msg_handler(struct scif_dev *scifdev, struct scif_qp *qp);
 149 int scif_setup_qp(struct scif_dev *scifdev);
 150 int scif_qp_response(phys_addr_t phys, struct scif_dev *dev);
 151 int scif_setup_qp_connect(struct scif_qp *qp, dma_addr_t *qp_offset,
 152                           int local_size, struct scif_dev *scifdev);
 153 int scif_setup_qp_accept(struct scif_qp *qp, dma_addr_t *qp_offset,
 154                          dma_addr_t phys, int local_size,
 155                          struct scif_dev *scifdev);
 156 int scif_setup_qp_connect_response(struct scif_dev *scifdev,
 157                                    struct scif_qp *qp, u64 payload);
 158 int scif_setup_loopback_qp(struct scif_dev *scifdev);
 159 int scif_destroy_loopback_qp(struct scif_dev *scifdev);
 160 void scif_poll_qp_state(struct work_struct *work);
 161 void scif_qp_response_ack(struct work_struct *work);
 162 void scif_destroy_p2p(struct scif_dev *scifdev);
 163 void scif_send_exit(struct scif_dev *scifdev);
 164 static inline struct device *scif_get_peer_dev(struct scif_dev *scifdev)
 165 {
 166         struct scif_peer_dev *spdev;
 167         struct device *spdev_ret;
 168
 169         rcu_read_lock();
 170         spdev = rcu_dereference(scifdev->spdev);
 171         if (spdev)
 172                 spdev_ret = get_device(&spdev->dev);
 173         else
 174                 spdev_ret = ERR_PTR(-ENODEV);
 175         rcu_read_unlock();
 176         return spdev_ret;
 177 }
 178
 179 static inline void scif_put_peer_dev(struct device *dev)
 180 {
 181         put_device(dev);
 182 }
 183 #endif  /* SCIF_NODEQP */