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 <linux/platform_device.h>
  35 #include "hns_roce_common.h"
  36 #include "hns_roce_device.h"
  37 #include "hns_roce_cmd.h"
  38
  39 #define CMD_POLL_TOKEN          0xffff
  40 #define CMD_MAX_NUM             32
  41 #define CMD_TOKEN_MASK          0x1f
  42
  43 static int hns_roce_cmd_mbox_post_hw(struct hns_roce_dev *hr_dev, u64 in_param,
  44                                      u64 out_param, u32 in_modifier,
  45                                      u8 op_modifier, u16 op, u16 token,
  46                                      int event)
  47 {
  48         struct hns_roce_cmdq *cmd = &hr_dev->cmd;
  49         int ret;
  50
  51         mutex_lock(&cmd->hcr_mutex);
  52         ret = hr_dev->hw->post_mbox(hr_dev, in_param, out_param, in_modifier,
  53                                     op_modifier, op, token, event);
  54         mutex_unlock(&cmd->hcr_mutex);
  55
  56         return ret;
  57 }
  58
  59 /* this should be called with "poll_sem" */
  60 static int __hns_roce_cmd_mbox_poll(struct hns_roce_dev *hr_dev, u64 in_param,
  61                                     u64 out_param, unsigned long in_modifier,
  62                                     u8 op_modifier, u16 op,
  63                                     unsigned long timeout)
  64 {
  65         struct device *dev = hr_dev->dev;
  66         int ret;
  67
  68         ret = hns_roce_cmd_mbox_post_hw(hr_dev, in_param, out_param,
  69                                         in_modifier, op_modifier, op,
  70                                         CMD_POLL_TOKEN, 0);
  71         if (ret) {
  72                 dev_err(dev, "[cmd_poll]hns_roce_cmd_mbox_post_hw failed\n");
  73                 return ret;
  74         }
  75
  76         return hr_dev->hw->chk_mbox(hr_dev, timeout);
  77 }
  78
  79 static int hns_roce_cmd_mbox_poll(struct hns_roce_dev *hr_dev, u64 in_param,
  80                                   u64 out_param, unsigned long in_modifier,
  81                                   u8 op_modifier, u16 op, unsigned long timeout)
  82 {
  83         int ret;
  84
  85         down(&hr_dev->cmd.poll_sem);
  86         ret = __hns_roce_cmd_mbox_poll(hr_dev, in_param, out_param, in_modifier,
  87                                        op_modifier, op, timeout);
  88         up(&hr_dev->cmd.poll_sem);
  89
  90         return ret;
  91 }
  92
  93 void hns_roce_cmd_event(struct hns_roce_dev *hr_dev, u16 token, u8 status,
  94                         u64 out_param)
  95 {
  96         struct hns_roce_cmd_context
  97                 *context = &hr_dev->cmd.context[token & hr_dev->cmd.token_mask];
  98
  99         if (token != context->token)
 100                 return;
 101
 102         context->result = (status == HNS_ROCE_CMD_SUCCESS) ? 0 : (-EIO);
 103         context->out_param = out_param;
 104         complete(&context->done);
 105 }
 106 EXPORT_SYMBOL_GPL(hns_roce_cmd_event);
 107
 108 /* this should be called with "use_events" */
 109 static int __hns_roce_cmd_mbox_wait(struct hns_roce_dev *hr_dev, u64 in_param,
 110                                     u64 out_param, unsigned long in_modifier,
 111                                     u8 op_modifier, u16 op,
 112                                     unsigned long timeout)
 113 {
 114         struct hns_roce_cmdq *cmd = &hr_dev->cmd;
 115         struct hns_roce_cmd_context *context;
 116         struct device *dev = hr_dev->dev;
 117         int ret;
 118
 119         spin_lock(&cmd->context_lock);
 120         WARN_ON(cmd->free_head < 0);
 121         context = &cmd->context[cmd->free_head];
 122         context->token += cmd->token_mask + 1;
 123         cmd->free_head = context->next;
 124         spin_unlock(&cmd->context_lock);
 125
 126         init_completion(&context->done);
 127
 128         ret = hns_roce_cmd_mbox_post_hw(hr_dev, in_param, out_param,
 129                                         in_modifier, op_modifier, op,
 130                                         context->token, 1);
 131         if (ret)
 132                 goto out;
 133
 134         /*
 135          * It is timeout when wait_for_completion_timeout return 0
 136          * The return value is the time limit set in advance
 137          * how many seconds showing
 138          */
 139         if (!wait_for_completion_timeout(&context->done,
 140                                          msecs_to_jiffies(timeout))) {
 141                 dev_err(dev, "[cmd]wait_for_completion_timeout timeout\n");
 142                 ret = -EBUSY;
 143                 goto out;
 144         }
 145
 146         ret = context->result;
 147         if (ret) {
 148                 dev_err(dev, "[cmd]event mod cmd process error!err=%d\n", ret);
 149                 goto out;
 150         }
 151
 152 out:
 153         spin_lock(&cmd->context_lock);
 154         context->next = cmd->free_head;
 155         cmd->free_head = context - cmd->context;
 156         spin_unlock(&cmd->context_lock);
 157
 158         return ret;
 159 }
 160
 161 static int hns_roce_cmd_mbox_wait(struct hns_roce_dev *hr_dev, u64 in_param,
 162                                   u64 out_param, unsigned long in_modifier,
 163                                   u8 op_modifier, u16 op, unsigned long timeout)
 164 {
 165         int ret = 0;
 166
 167         down(&hr_dev->cmd.event_sem);
 168         ret = __hns_roce_cmd_mbox_wait(hr_dev, in_param, out_param,
 169                                        in_modifier, op_modifier, op, timeout);
 170         up(&hr_dev->cmd.event_sem);
 171
 172         return ret;
 173 }
 174
 175 int hns_roce_cmd_mbox(struct hns_roce_dev *hr_dev, u64 in_param, u64 out_param,
 176                       unsigned long in_modifier, u8 op_modifier, u16 op,
 177                       unsigned long timeout)
 178 {
 179         if (hr_dev->is_reset)
 180                 return 0;
 181
 182         if (hr_dev->cmd.use_events)
 183                 return hns_roce_cmd_mbox_wait(hr_dev, in_param, out_param,
 184                                               in_modifier, op_modifier, op,
 185                                               timeout);
 186         else
 187                 return hns_roce_cmd_mbox_poll(hr_dev, in_param, out_param,
 188                                               in_modifier, op_modifier, op,
 189                                               timeout);
 190 }
 191 EXPORT_SYMBOL_GPL(hns_roce_cmd_mbox);
 192
 193 int hns_roce_cmd_init(struct hns_roce_dev *hr_dev)
 194 {
 195         struct device *dev = hr_dev->dev;
 196
 197         mutex_init(&hr_dev->cmd.hcr_mutex);
 198         sema_init(&hr_dev->cmd.poll_sem, 1);
 199         hr_dev->cmd.use_events = 0;
 200         hr_dev->cmd.toggle = 1;
 201         hr_dev->cmd.max_cmds = CMD_MAX_NUM;
 202         hr_dev->cmd.pool = dma_pool_create("hns_roce_cmd", dev,
 203                                            HNS_ROCE_MAILBOX_SIZE,
 204                                            HNS_ROCE_MAILBOX_SIZE, 0);
 205         if (!hr_dev->cmd.pool)
 206                 return -ENOMEM;
 207
 208         return 0;
 209 }
 210
 211 void hns_roce_cmd_cleanup(struct hns_roce_dev *hr_dev)
 212 {
 213         dma_pool_destroy(hr_dev->cmd.pool);
 214 }
 215
 216 int hns_roce_cmd_use_events(struct hns_roce_dev *hr_dev)
 217 {
 218         struct hns_roce_cmdq *hr_cmd = &hr_dev->cmd;
 219         int i;
 220
 221         hr_cmd->context = kmalloc_array(hr_cmd->max_cmds,
 222                                         sizeof(*hr_cmd->context),
 223                                         GFP_KERNEL);
 224         if (!hr_cmd->context)
 225                 return -ENOMEM;
 226
 227         for (i = 0; i < hr_cmd->max_cmds; ++i) {
 228                 hr_cmd->context[i].token = i;
 229                 hr_cmd->context[i].next = i + 1;
 230         }
 231
 232         hr_cmd->context[hr_cmd->max_cmds - 1].next = -1;
 233         hr_cmd->free_head = 0;
 234
 235         sema_init(&hr_cmd->event_sem, hr_cmd->max_cmds);
 236         spin_lock_init(&hr_cmd->context_lock);
 237
 238         hr_cmd->token_mask = CMD_TOKEN_MASK;
 239         hr_cmd->use_events = 1;
 240
 241         down(&hr_cmd->poll_sem);
 242
 243         return 0;
 244 }
 245
 246 void hns_roce_cmd_use_polling(struct hns_roce_dev *hr_dev)
 247 {
 248         struct hns_roce_cmdq *hr_cmd = &hr_dev->cmd;
 249         int i;
 250
 251         hr_cmd->use_events = 0;
 252
 253         for (i = 0; i < hr_cmd->max_cmds; ++i)
 254                 down(&hr_cmd->event_sem);
 255
 256         kfree(hr_cmd->context);
 257         up(&hr_cmd->poll_sem);
 258 }
 259
 260 struct hns_roce_cmd_mailbox
 261         *hns_roce_alloc_cmd_mailbox(struct hns_roce_dev *hr_dev)
 262 {
 263         struct hns_roce_cmd_mailbox *mailbox;
 264
 265         mailbox = kmalloc(sizeof(*mailbox), GFP_KERNEL);
 266         if (!mailbox)
 267                 return ERR_PTR(-ENOMEM);
 268
 269         mailbox->buf = dma_pool_alloc(hr_dev->cmd.pool, GFP_KERNEL,
 270                                       &mailbox->dma);
 271         if (!mailbox->buf) {
 272                 kfree(mailbox);
 273                 return ERR_PTR(-ENOMEM);
 274         }
 275
 276         return mailbox;
 277 }
 278 EXPORT_SYMBOL_GPL(hns_roce_alloc_cmd_mailbox);
 279
 280 void hns_roce_free_cmd_mailbox(struct hns_roce_dev *hr_dev,
 281                                struct hns_roce_cmd_mailbox *mailbox)
 282 {
 283         if (!mailbox)
 284                 return;
 285
 286         dma_pool_free(hr_dev->cmd.pool, mailbox->buf, mailbox->dma);
 287         kfree(mailbox);
 288 }
 289 EXPORT_SYMBOL_GPL(hns_roce_free_cmd_mailbox);