drivers/crypto/marvell/octeontx/otx_cptvf_mbox.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Marvell OcteonTX CPT driver
   3  *
   4  * Copyright (C) 2019 Marvell International Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/delay.h>
  12 #include "otx_cptvf.h"
  13
  14 #define CPT_MBOX_MSG_TIMEOUT 2000
  15
  16 static char *get_mbox_opcode_str(int msg_opcode)
  17 {
  18         char *str = "Unknown";
  19
  20         switch (msg_opcode) {
  21         case OTX_CPT_MSG_VF_UP:
  22                 str = "UP";
  23                 break;
  24
  25         case OTX_CPT_MSG_VF_DOWN:
  26                 str = "DOWN";
  27                 break;
  28
  29         case OTX_CPT_MSG_READY:
  30                 str = "READY";
  31                 break;
  32
  33         case OTX_CPT_MSG_QLEN:
  34                 str = "QLEN";
  35                 break;
  36
  37         case OTX_CPT_MSG_QBIND_GRP:
  38                 str = "QBIND_GRP";
  39                 break;
  40
  41         case OTX_CPT_MSG_VQ_PRIORITY:
  42                 str = "VQ_PRIORITY";
  43                 break;
  44
  45         case OTX_CPT_MSG_PF_TYPE:
  46                 str = "PF_TYPE";
  47                 break;
  48
  49         case OTX_CPT_MSG_ACK:
  50                 str = "ACK";
  51                 break;
  52
  53         case OTX_CPT_MSG_NACK:
  54                 str = "NACK";
  55                 break;
  56         }
  57         return str;
  58 }
  59
  60 static void dump_mbox_msg(struct otx_cpt_mbox *mbox_msg, int vf_id)
  61 {
  62         char raw_data_str[OTX_CPT_MAX_MBOX_DATA_STR_SIZE];
  63
  64         hex_dump_to_buffer(mbox_msg, sizeof(struct otx_cpt_mbox), 16, 8,
  65                            raw_data_str, OTX_CPT_MAX_MBOX_DATA_STR_SIZE, false);
  66         if (vf_id >= 0)
  67                 pr_debug("MBOX msg %s received from VF%d raw_data %s",
  68                          get_mbox_opcode_str(mbox_msg->msg), vf_id,
  69                          raw_data_str);
  70         else
  71                 pr_debug("MBOX msg %s received from PF raw_data %s",
  72                          get_mbox_opcode_str(mbox_msg->msg), raw_data_str);
  73 }
  74
  75 static void cptvf_send_msg_to_pf(struct otx_cptvf *cptvf,
  76                                      struct otx_cpt_mbox *mbx)
  77 {
  78         /* Writing mbox(1) causes interrupt */
  79         writeq(mbx->msg, cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 0));
  80         writeq(mbx->data, cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 1));
  81 }
  82
  83 /* Interrupt handler to handle mailbox messages from VFs */
  84 void otx_cptvf_handle_mbox_intr(struct otx_cptvf *cptvf)
  85 {
  86         struct otx_cpt_mbox mbx = {};
  87
  88         /*
  89          * MBOX[0] contains msg
  90          * MBOX[1] contains data
  91          */
  92         mbx.msg  = readq(cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 0));
  93         mbx.data = readq(cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 1));
  94
  95         dump_mbox_msg(&mbx, -1);
  96
  97         switch (mbx.msg) {
  98         case OTX_CPT_MSG_VF_UP:
  99                 cptvf->pf_acked = true;
 100                 cptvf->num_vfs = mbx.data;
 101                 break;
 102         case OTX_CPT_MSG_READY:
 103                 cptvf->pf_acked = true;
 104                 cptvf->vfid = mbx.data;
 105                 dev_dbg(&cptvf->pdev->dev, "Received VFID %d\n", cptvf->vfid);
 106                 break;
 107         case OTX_CPT_MSG_QBIND_GRP:
 108                 cptvf->pf_acked = true;
 109                 cptvf->vftype = mbx.data;
 110                 dev_dbg(&cptvf->pdev->dev, "VF %d type %s group %d\n",
 111                         cptvf->vfid,
 112                         ((mbx.data == OTX_CPT_SE_TYPES) ? "SE" : "AE"),
 113                         cptvf->vfgrp);
 114                 break;
 115         case OTX_CPT_MSG_ACK:
 116                 cptvf->pf_acked = true;
 117                 break;
 118         case OTX_CPT_MSG_NACK:
 119                 cptvf->pf_nacked = true;
 120                 break;
 121         default:
 122                 dev_err(&cptvf->pdev->dev, "Invalid msg from PF, msg 0x%llx\n",
 123                         mbx.msg);
 124                 break;
 125         }
 126 }
 127
 128 static int cptvf_send_msg_to_pf_timeout(struct otx_cptvf *cptvf,
 129                                         struct otx_cpt_mbox *mbx)
 130 {
 131         int timeout = CPT_MBOX_MSG_TIMEOUT;
 132         int sleep = 10;
 133
 134         cptvf->pf_acked = false;
 135         cptvf->pf_nacked = false;
 136         cptvf_send_msg_to_pf(cptvf, mbx);
 137         /* Wait for previous message to be acked, timeout 2sec */
 138         while (!cptvf->pf_acked) {
 139                 if (cptvf->pf_nacked)
 140                         return -EINVAL;
 141                 msleep(sleep);
 142                 if (cptvf->pf_acked)
 143                         break;
 144                 timeout -= sleep;
 145                 if (!timeout) {
 146                         dev_err(&cptvf->pdev->dev,
 147                                 "PF didn't ack to mbox msg %llx from VF%u\n",
 148                                 mbx->msg, cptvf->vfid);
 149                         return -EBUSY;
 150                 }
 151         }
 152         return 0;
 153 }
 154
 155 /*
 156  * Checks if VF is able to comminicate with PF
 157  * and also gets the CPT number this VF is associated to.
 158  */
 159 int otx_cptvf_check_pf_ready(struct otx_cptvf *cptvf)
 160 {
 161         struct otx_cpt_mbox mbx = {};
 162         int ret;
 163
 164         mbx.msg = OTX_CPT_MSG_READY;
 165         ret = cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
 166
 167         return ret;
 168 }
 169
 170 /*
 171  * Communicate VQs size to PF to program CPT(0)_PF_Q(0-15)_CTL of the VF.
 172  * Must be ACKed.
 173  */
 174 int otx_cptvf_send_vq_size_msg(struct otx_cptvf *cptvf)
 175 {
 176         struct otx_cpt_mbox mbx = {};
 177         int ret;
 178
 179         mbx.msg = OTX_CPT_MSG_QLEN;
 180         mbx.data = cptvf->qsize;
 181         ret = cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
 182
 183         return ret;
 184 }
 185
 186 /*
 187  * Communicate VF group required to PF and get the VQ binded to that group
 188  */
 189 int otx_cptvf_send_vf_to_grp_msg(struct otx_cptvf *cptvf, int group)
 190 {
 191         struct otx_cpt_mbox mbx = {};
 192         int ret;
 193
 194         mbx.msg = OTX_CPT_MSG_QBIND_GRP;
 195         /* Convey group of the VF */
 196         mbx.data = group;
 197         ret = cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
 198         if (ret)
 199                 return ret;
 200         cptvf->vfgrp = group;
 201
 202         return 0;
 203 }
 204
 205 /*
 206  * Communicate VF group required to PF and get the VQ binded to that group
 207  */
 208 int otx_cptvf_send_vf_priority_msg(struct otx_cptvf *cptvf)
 209 {
 210         struct otx_cpt_mbox mbx = {};
 211         int ret;
 212
 213         mbx.msg = OTX_CPT_MSG_VQ_PRIORITY;
 214         /* Convey group of the VF */
 215         mbx.data = cptvf->priority;
 216         ret = cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
 217
 218         return ret;
 219 }
 220
 221 /*
 222  * Communicate to PF that VF is UP and running
 223  */
 224 int otx_cptvf_send_vf_up(struct otx_cptvf *cptvf)
 225 {
 226         struct otx_cpt_mbox mbx = {};
 227         int ret;
 228
 229         mbx.msg = OTX_CPT_MSG_VF_UP;
 230         ret = cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
 231
 232         return ret;
 233 }
 234
 235 /*
 236  * Communicate to PF that VF is DOWN and running
 237  */
 238 int otx_cptvf_send_vf_down(struct otx_cptvf *cptvf)
 239 {
 240         struct otx_cpt_mbox mbx = {};
 241         int ret;
 242
 243         mbx.msg = OTX_CPT_MSG_VF_DOWN;
 244         ret = cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
 245
 246         return ret;
 247 }