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  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
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  17  * General Public License for more details.
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  20  * along with this program; if not, write to the Free Software
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  32  *
  33  * Copyright(c) 2015 Intel Mobile Communications GmbH
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  41  *    notice, this list of conditions and the following disclaimer.
  42  *  * Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in
  44  *    the documentation and/or other materials provided with the
  45  *    distribution.
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  47  *    contributors may be used to endorse or promote products derived
  48  *    from this software without specific prior written permission.
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  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *
  62  *****************************************************************************/
  63 #include <linux/kernel.h>
  64 #include <linux/bsearch.h>
  65
  66 #include "iwl-trans.h"
  67 #include "iwl-drv.h"
  68 #include "iwl-fh.h"
  69
  70 struct iwl_trans *iwl_trans_alloc(unsigned int priv_size,
  71                                   struct device *dev,
  72                                   const struct iwl_cfg *cfg,
  73                                   const struct iwl_trans_ops *ops)
  74 {
  75         struct iwl_trans *trans;
  76 #ifdef CONFIG_LOCKDEP
  77         static struct lock_class_key __key;
  78 #endif
  79
  80         trans = devm_kzalloc(dev, sizeof(*trans) + priv_size, GFP_KERNEL);
  81         if (!trans)
  82                 return NULL;
  83
  84 #ifdef CONFIG_LOCKDEP
  85         lockdep_init_map(&trans->sync_cmd_lockdep_map, "sync_cmd_lockdep_map",
  86                          &__key, 0);
  87 #endif
  88
  89         trans->dev = dev;
  90         trans->cfg = cfg;
  91         trans->ops = ops;
  92         trans->num_rx_queues = 1;
  93
  94         snprintf(trans->dev_cmd_pool_name, sizeof(trans->dev_cmd_pool_name),
  95                  "iwl_cmd_pool:%s", dev_name(trans->dev));
  96         trans->dev_cmd_pool =
  97                 kmem_cache_create(trans->dev_cmd_pool_name,
  98                                   sizeof(struct iwl_device_cmd),
  99                                   sizeof(void *),
 100                                   SLAB_HWCACHE_ALIGN,
 101                                   NULL);
 102         if (!trans->dev_cmd_pool)
 103                 return NULL;
 104
 105         WARN_ON(!ops->wait_txq_empty && !ops->wait_tx_queues_empty);
 106
 107         return trans;
 108 }
 109
 110 void iwl_trans_free(struct iwl_trans *trans)
 111 {
 112         kmem_cache_destroy(trans->dev_cmd_pool);
 113 }
 114
 115 int iwl_trans_send_cmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
 116 {
 117         int ret;
 118
 119         if (unlikely(!(cmd->flags & CMD_SEND_IN_RFKILL) &&
 120                      test_bit(STATUS_RFKILL_OPMODE, &trans->status)))
 121                 return -ERFKILL;
 122
 123         if (unlikely(test_bit(STATUS_FW_ERROR, &trans->status)))
 124                 return -EIO;
 125
 126         if (unlikely(trans->state != IWL_TRANS_FW_ALIVE)) {
 127                 IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
 128                 return -EIO;
 129         }
 130
 131         if (WARN_ON((cmd->flags & CMD_WANT_ASYNC_CALLBACK) &&
 132                     !(cmd->flags & CMD_ASYNC)))
 133                 return -EINVAL;
 134
 135         if (!(cmd->flags & CMD_ASYNC))
 136                 lock_map_acquire_read(&trans->sync_cmd_lockdep_map);
 137
 138         if (trans->wide_cmd_header && !iwl_cmd_groupid(cmd->id))
 139                 cmd->id = DEF_ID(cmd->id);
 140
 141         ret = trans->ops->send_cmd(trans, cmd);
 142
 143         if (!(cmd->flags & CMD_ASYNC))
 144                 lock_map_release(&trans->sync_cmd_lockdep_map);
 145
 146         if (WARN_ON((cmd->flags & CMD_WANT_SKB) && !ret && !cmd->resp_pkt))
 147                 return -EIO;
 148
 149         return ret;
 150 }
 151 IWL_EXPORT_SYMBOL(iwl_trans_send_cmd);
 152
 153 /* Comparator for struct iwl_hcmd_names.
 154  * Used in the binary search over a list of host commands.
 155  *
 156  * @key: command_id that we're looking for.
 157  * @elt: struct iwl_hcmd_names candidate for match.
 158  *
 159  * @return 0 iff equal.
 160  */
 161 static int iwl_hcmd_names_cmp(const void *key, const void *elt)
 162 {
 163         const struct iwl_hcmd_names *name = elt;
 164         u8 cmd1 = *(u8 *)key;
 165         u8 cmd2 = name->cmd_id;
 166
 167         return (cmd1 - cmd2);
 168 }
 169
 170 const char *iwl_get_cmd_string(struct iwl_trans *trans, u32 id)
 171 {
 172         u8 grp, cmd;
 173         struct iwl_hcmd_names *ret;
 174         const struct iwl_hcmd_arr *arr;
 175         size_t size = sizeof(struct iwl_hcmd_names);
 176
 177         grp = iwl_cmd_groupid(id);
 178         cmd = iwl_cmd_opcode(id);
 179
 180         if (!trans->command_groups || grp >= trans->command_groups_size ||
 181             !trans->command_groups[grp].arr)
 182                 return "UNKNOWN";
 183
 184         arr = &trans->command_groups[grp];
 185         ret = bsearch(&cmd, arr->arr, arr->size, size, iwl_hcmd_names_cmp);
 186         if (!ret)
 187                 return "UNKNOWN";
 188         return ret->cmd_name;
 189 }
 190 IWL_EXPORT_SYMBOL(iwl_get_cmd_string);
 191
 192 int iwl_cmd_groups_verify_sorted(const struct iwl_trans_config *trans)
 193 {
 194         int i, j;
 195         const struct iwl_hcmd_arr *arr;
 196
 197         for (i = 0; i < trans->command_groups_size; i++) {
 198                 arr = &trans->command_groups[i];
 199                 if (!arr->arr)
 200                         continue;
 201                 for (j = 0; j < arr->size - 1; j++)
 202                         if (arr->arr[j].cmd_id > arr->arr[j + 1].cmd_id)
 203                                 return -1;
 204         }
 205         return 0;
 206 }
 207 IWL_EXPORT_SYMBOL(iwl_cmd_groups_verify_sorted);