drivers/net/wireless/intel/iwlwifi/iwl-trans.c

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2015 Intel Mobile Communications GmbH
   9  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  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
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  18  * General Public License for more details.
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  21  * along with this program; if not, write to the Free Software
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  29  *  Intel Linux Wireless <linuxwifi@intel.com>
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  32  * BSD LICENSE
  33  *
  34  * Copyright(c) 2015 Intel Mobile Communications GmbH
  35  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
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  43  *    notice, this list of conditions and the following disclaimer.
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  45  *    notice, this list of conditions and the following disclaimer in
  46  *    the documentation and/or other materials provided with the
  47  *    distribution.
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  50  *    from this software without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  53  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  54  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  55  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  56  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  64  *****************************************************************************/
  65 #include <linux/kernel.h>
  66 #include <linux/bsearch.h>
  67
  68 #include "iwl-trans.h"
  69 #include "iwl-drv.h"
  70 #include "iwl-fh.h"
  71
  72 struct iwl_trans *iwl_trans_alloc(unsigned int priv_size,
  73                                   struct device *dev,
  74                                   const struct iwl_cfg *cfg,
  75                                   const struct iwl_trans_ops *ops)
  76 {
  77         struct iwl_trans *trans;
  78 #ifdef CONFIG_LOCKDEP
  79         static struct lock_class_key __key;
  80 #endif
  81
  82         trans = devm_kzalloc(dev, sizeof(*trans) + priv_size, GFP_KERNEL);
  83         if (!trans)
  84                 return NULL;
  85
  86 #ifdef CONFIG_LOCKDEP
  87         lockdep_init_map(&trans->sync_cmd_lockdep_map, "sync_cmd_lockdep_map",
  88                          &__key, 0);
  89 #endif
  90
  91         trans->dev = dev;
  92         trans->cfg = cfg;
  93         trans->ops = ops;
  94         trans->num_rx_queues = 1;
  95
  96         snprintf(trans->dev_cmd_pool_name, sizeof(trans->dev_cmd_pool_name),
  97                  "iwl_cmd_pool:%s", dev_name(trans->dev));
  98         trans->dev_cmd_pool =
  99                 kmem_cache_create(trans->dev_cmd_pool_name,
 100                                   sizeof(struct iwl_device_cmd),
 101                                   sizeof(void *),
 102                                   SLAB_HWCACHE_ALIGN,
 103                                   NULL);
 104         if (!trans->dev_cmd_pool)
 105                 return NULL;
 106
 107         WARN_ON(!ops->wait_txq_empty && !ops->wait_tx_queues_empty);
 108
 109         return trans;
 110 }
 111
 112 void iwl_trans_free(struct iwl_trans *trans)
 113 {
 114         kmem_cache_destroy(trans->dev_cmd_pool);
 115 }
 116
 117 int iwl_trans_send_cmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
 118 {
 119         int ret;
 120
 121         if (unlikely(!(cmd->flags & CMD_SEND_IN_RFKILL) &&
 122                      test_bit(STATUS_RFKILL_OPMODE, &trans->status)))
 123                 return -ERFKILL;
 124
 125         if (unlikely(test_bit(STATUS_FW_ERROR, &trans->status)))
 126                 return -EIO;
 127
 128         if (unlikely(trans->state != IWL_TRANS_FW_ALIVE)) {
 129                 IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
 130                 return -EIO;
 131         }
 132
 133         if (WARN_ON((cmd->flags & CMD_WANT_ASYNC_CALLBACK) &&
 134                     !(cmd->flags & CMD_ASYNC)))
 135                 return -EINVAL;
 136
 137         if (!(cmd->flags & CMD_ASYNC))
 138                 lock_map_acquire_read(&trans->sync_cmd_lockdep_map);
 139
 140         if (trans->wide_cmd_header && !iwl_cmd_groupid(cmd->id))
 141                 cmd->id = DEF_ID(cmd->id);
 142
 143         ret = trans->ops->send_cmd(trans, cmd);
 144
 145         if (!(cmd->flags & CMD_ASYNC))
 146                 lock_map_release(&trans->sync_cmd_lockdep_map);
 147
 148         if (WARN_ON((cmd->flags & CMD_WANT_SKB) && !ret && !cmd->resp_pkt))
 149                 return -EIO;
 150
 151         return ret;
 152 }
 153 IWL_EXPORT_SYMBOL(iwl_trans_send_cmd);
 154
 155 /* Comparator for struct iwl_hcmd_names.
 156  * Used in the binary search over a list of host commands.
 157  *
 158  * @key: command_id that we're looking for.
 159  * @elt: struct iwl_hcmd_names candidate for match.
 160  *
 161  * @return 0 iff equal.
 162  */
 163 static int iwl_hcmd_names_cmp(const void *key, const void *elt)
 164 {
 165         const struct iwl_hcmd_names *name = elt;
 166         u8 cmd1 = *(u8 *)key;
 167         u8 cmd2 = name->cmd_id;
 168
 169         return (cmd1 - cmd2);
 170 }
 171
 172 const char *iwl_get_cmd_string(struct iwl_trans *trans, u32 id)
 173 {
 174         u8 grp, cmd;
 175         struct iwl_hcmd_names *ret;
 176         const struct iwl_hcmd_arr *arr;
 177         size_t size = sizeof(struct iwl_hcmd_names);
 178
 179         grp = iwl_cmd_groupid(id);
 180         cmd = iwl_cmd_opcode(id);
 181
 182         if (!trans->command_groups || grp >= trans->command_groups_size ||
 183             !trans->command_groups[grp].arr)
 184                 return "UNKNOWN";
 185
 186         arr = &trans->command_groups[grp];
 187         ret = bsearch(&cmd, arr->arr, arr->size, size, iwl_hcmd_names_cmp);
 188         if (!ret)
 189                 return "UNKNOWN";
 190         return ret->cmd_name;
 191 }
 192 IWL_EXPORT_SYMBOL(iwl_get_cmd_string);
 193
 194 int iwl_cmd_groups_verify_sorted(const struct iwl_trans_config *trans)
 195 {
 196         int i, j;
 197         const struct iwl_hcmd_arr *arr;
 198
 199         for (i = 0; i < trans->command_groups_size; i++) {
 200                 arr = &trans->command_groups[i];
 201                 if (!arr->arr)
 202                         continue;
 203                 for (j = 0; j < arr->size - 1; j++)
 204                         if (arr->arr[j].cmd_id > arr->arr[j + 1].cmd_id)
 205                                 return -1;
 206         }
 207         return 0;
 208 }
 209 IWL_EXPORT_SYMBOL(iwl_cmd_groups_verify_sorted);
 210
 211 void iwl_trans_ref(struct iwl_trans *trans)
 212 {
 213         if (trans->ops->ref)
 214                 trans->ops->ref(trans);
 215 }
 216 IWL_EXPORT_SYMBOL(iwl_trans_ref);
 217
 218 void iwl_trans_unref(struct iwl_trans *trans)
 219 {
 220         if (trans->ops->unref)
 221                 trans->ops->unref(trans);
 222 }
 223 IWL_EXPORT_SYMBOL(iwl_trans_unref);