drivers/infiniband/hw/hns/hns_roce_cmd.c

   1 /*
   2  * Copyright (c) 2016 Hisilicon Limited.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/dmapool.h>
  34 #include "hns_roce_common.h"
  35 #include "hns_roce_device.h"
  36 #include "hns_roce_cmd.h"
  37
  38 #define CMD_POLL_TOKEN 0xffff
  39 #define CMD_MAX_NUM 32
  40
  41 static int hns_roce_cmd_mbox_post_hw(struct hns_roce_dev *hr_dev,
  42                                      struct hns_roce_mbox_msg *mbox_msg)
  43 {
  44         return hr_dev->hw->post_mbox(hr_dev, mbox_msg);
  45 }
  46
  47 /* this should be called with "poll_sem" */
  48 static int __hns_roce_cmd_mbox_poll(struct hns_roce_dev *hr_dev,
  49                                     struct hns_roce_mbox_msg *mbox_msg)
  50 {
  51         int ret;
  52
  53         ret = hns_roce_cmd_mbox_post_hw(hr_dev, mbox_msg);
  54         if (ret) {
  55                 dev_err_ratelimited(hr_dev->dev,
  56                                     "failed to post mailbox 0x%x in poll mode, ret = %d.\n",
  57                                     mbox_msg->cmd, ret);
  58                 return ret;
  59         }
  60
  61         return hr_dev->hw->poll_mbox_done(hr_dev);
  62 }
  63
  64 static int hns_roce_cmd_mbox_poll(struct hns_roce_dev *hr_dev,
  65                                   struct hns_roce_mbox_msg *mbox_msg)
  66 {
  67         int ret;
  68
  69         down(&hr_dev->cmd.poll_sem);
  70         ret = __hns_roce_cmd_mbox_poll(hr_dev, mbox_msg);
  71         up(&hr_dev->cmd.poll_sem);
  72
  73         return ret;
  74 }
  75
  76 void hns_roce_cmd_event(struct hns_roce_dev *hr_dev, u16 token, u8 status,
  77                         u64 out_param)
  78 {
  79         struct hns_roce_cmd_context *context =
  80                 &hr_dev->cmd.context[token % hr_dev->cmd.max_cmds];
  81
  82         if (unlikely(token != context->token)) {
  83                 dev_err_ratelimited(hr_dev->dev,
  84                                     "[cmd] invalid ae token 0x%x, context token is 0x%x.\n",
  85                                     token, context->token);
  86                 return;
  87         }
  88
  89         context->result = (status == HNS_ROCE_CMD_SUCCESS) ? 0 : (-EIO);
  90         context->out_param = out_param;
  91         complete(&context->done);
  92 }
  93
  94 static int __hns_roce_cmd_mbox_wait(struct hns_roce_dev *hr_dev,
  95                                     struct hns_roce_mbox_msg *mbox_msg)
  96 {
  97         struct hns_roce_cmdq *cmd = &hr_dev->cmd;
  98         struct hns_roce_cmd_context *context;
  99         struct device *dev = hr_dev->dev;
 100         int ret;
 101
 102         spin_lock(&cmd->context_lock);
 103
 104         do {
 105                 context = &cmd->context[cmd->free_head];
 106                 cmd->free_head = context->next;
 107         } while (context->busy);
 108
 109         context->busy = 1;
 110         context->token += cmd->max_cmds;
 111
 112         spin_unlock(&cmd->context_lock);
 113
 114         reinit_completion(&context->done);
 115
 116         mbox_msg->token = context->token;
 117         ret = hns_roce_cmd_mbox_post_hw(hr_dev, mbox_msg);
 118         if (ret) {
 119                 dev_err_ratelimited(dev,
 120                                     "failed to post mailbox 0x%x in event mode, ret = %d.\n",
 121                                     mbox_msg->cmd, ret);
 122                 goto out;
 123         }
 124
 125         if (!wait_for_completion_timeout(&context->done,
 126                                 msecs_to_jiffies(HNS_ROCE_CMD_TIMEOUT_MSECS))) {
 127                 dev_err_ratelimited(dev, "[cmd] token 0x%x mailbox 0x%x timeout.\n",
 128                                     context->token, mbox_msg->cmd);
 129                 ret = -EBUSY;
 130                 goto out;
 131         }
 132
 133         ret = context->result;
 134         if (ret)
 135                 dev_err_ratelimited(dev, "[cmd] token 0x%x mailbox 0x%x error %d.\n",
 136                                     context->token, mbox_msg->cmd, ret);
 137
 138 out:
 139         context->busy = 0;
 140         return ret;
 141 }
 142
 143 static int hns_roce_cmd_mbox_wait(struct hns_roce_dev *hr_dev,
 144                                   struct hns_roce_mbox_msg *mbox_msg)
 145 {
 146         int ret;
 147
 148         down(&hr_dev->cmd.event_sem);
 149         ret = __hns_roce_cmd_mbox_wait(hr_dev, mbox_msg);
 150         up(&hr_dev->cmd.event_sem);
 151
 152         return ret;
 153 }
 154
 155 int hns_roce_cmd_mbox(struct hns_roce_dev *hr_dev, u64 in_param, u64 out_param,
 156                       u8 cmd, unsigned long tag)
 157 {
 158         struct hns_roce_mbox_msg mbox_msg = {};
 159         bool is_busy;
 160
 161         if (hr_dev->hw->chk_mbox_avail)
 162                 if (!hr_dev->hw->chk_mbox_avail(hr_dev, &is_busy))
 163                         return is_busy ? -EBUSY : 0;
 164
 165         mbox_msg.in_param = in_param;
 166         mbox_msg.out_param = out_param;
 167         mbox_msg.cmd = cmd;
 168         mbox_msg.tag = tag;
 169
 170         if (hr_dev->cmd.use_events) {
 171                 mbox_msg.event_en = 1;
 172
 173                 return hns_roce_cmd_mbox_wait(hr_dev, &mbox_msg);
 174         } else {
 175                 mbox_msg.event_en = 0;
 176                 mbox_msg.token = CMD_POLL_TOKEN;
 177
 178                 return hns_roce_cmd_mbox_poll(hr_dev, &mbox_msg);
 179         }
 180 }
 181
 182 int hns_roce_cmd_init(struct hns_roce_dev *hr_dev)
 183 {
 184         sema_init(&hr_dev->cmd.poll_sem, 1);
 185         hr_dev->cmd.use_events = 0;
 186         hr_dev->cmd.max_cmds = CMD_MAX_NUM;
 187         hr_dev->cmd.pool = dma_pool_create("hns_roce_cmd", hr_dev->dev,
 188                                            HNS_ROCE_MAILBOX_SIZE,
 189                                            HNS_ROCE_MAILBOX_SIZE, 0);
 190         if (!hr_dev->cmd.pool)
 191                 return -ENOMEM;
 192
 193         return 0;
 194 }
 195
 196 void hns_roce_cmd_cleanup(struct hns_roce_dev *hr_dev)
 197 {
 198         dma_pool_destroy(hr_dev->cmd.pool);
 199 }
 200
 201 int hns_roce_cmd_use_events(struct hns_roce_dev *hr_dev)
 202 {
 203         struct hns_roce_cmdq *hr_cmd = &hr_dev->cmd;
 204         int i;
 205
 206         hr_cmd->context =
 207                 kcalloc(hr_cmd->max_cmds, sizeof(*hr_cmd->context), GFP_KERNEL);
 208         if (!hr_cmd->context) {
 209                 hr_dev->cmd_mod = 0;
 210                 return -ENOMEM;
 211         }
 212
 213         for (i = 0; i < hr_cmd->max_cmds; ++i) {
 214                 hr_cmd->context[i].token = i;
 215                 hr_cmd->context[i].next = i + 1;
 216                 init_completion(&hr_cmd->context[i].done);
 217         }
 218         hr_cmd->context[hr_cmd->max_cmds - 1].next = 0;
 219         hr_cmd->free_head = 0;
 220
 221         sema_init(&hr_cmd->event_sem, hr_cmd->max_cmds);
 222         spin_lock_init(&hr_cmd->context_lock);
 223
 224         hr_cmd->use_events = 1;
 225
 226         return 0;
 227 }
 228
 229 void hns_roce_cmd_use_polling(struct hns_roce_dev *hr_dev)
 230 {
 231         struct hns_roce_cmdq *hr_cmd = &hr_dev->cmd;
 232
 233         kfree(hr_cmd->context);
 234         hr_cmd->use_events = 0;
 235 }
 236
 237 struct hns_roce_cmd_mailbox *
 238 hns_roce_alloc_cmd_mailbox(struct hns_roce_dev *hr_dev)
 239 {
 240         struct hns_roce_cmd_mailbox *mailbox;
 241
 242         mailbox = kmalloc(sizeof(*mailbox), GFP_KERNEL);
 243         if (!mailbox)
 244                 return ERR_PTR(-ENOMEM);
 245
 246         mailbox->buf =
 247                 dma_pool_alloc(hr_dev->cmd.pool, GFP_KERNEL, &mailbox->dma);
 248         if (!mailbox->buf) {
 249                 kfree(mailbox);
 250                 return ERR_PTR(-ENOMEM);
 251         }
 252
 253         return mailbox;
 254 }
 255
 256 void hns_roce_free_cmd_mailbox(struct hns_roce_dev *hr_dev,
 257                                struct hns_roce_cmd_mailbox *mailbox)
 258 {
 259         if (!mailbox)
 260                 return;
 261
 262         dma_pool_free(hr_dev->cmd.pool, mailbox->buf, mailbox->dma);
 263         kfree(mailbox);
 264 }
 265
 266 int hns_roce_create_hw_ctx(struct hns_roce_dev *dev,
 267                            struct hns_roce_cmd_mailbox *mailbox,
 268                            u8 cmd, unsigned long idx)
 269 {
 270         return hns_roce_cmd_mbox(dev, mailbox->dma, 0, cmd, idx);
 271 }
 272
 273 int hns_roce_destroy_hw_ctx(struct hns_roce_dev *dev, u8 cmd, unsigned long idx)
 274 {
 275         return hns_roce_cmd_mbox(dev, 0, 0, cmd, idx);
 276 }