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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  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  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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  30  *
  31  * BSD LICENSE
  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.
  49  *
  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                                   size_t dev_cmd_headroom)
  75 {
  76         struct iwl_trans *trans;
  77 #ifdef CONFIG_LOCKDEP
  78         static struct lock_class_key __key;
  79 #endif
  80
  81         trans = devm_kzalloc(dev, sizeof(*trans) + priv_size, GFP_KERNEL);
  82         if (!trans)
  83                 return NULL;
  84
  85 #ifdef CONFIG_LOCKDEP
  86         lockdep_init_map(&trans->sync_cmd_lockdep_map, "sync_cmd_lockdep_map",
  87                          &__key, 0);
  88 #endif
  89
  90         trans->dev = dev;
  91         trans->cfg = cfg;
  92         trans->ops = ops;
  93         trans->dev_cmd_headroom = dev_cmd_headroom;
  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                                   + trans->dev_cmd_headroom,
 102                                   sizeof(void *),
 103                                   SLAB_HWCACHE_ALIGN,
 104                                   NULL);
 105         if (!trans->dev_cmd_pool)
 106                 return NULL;
 107
 108         return trans;
 109 }
 110
 111 void iwl_trans_free(struct iwl_trans *trans)
 112 {
 113         kmem_cache_destroy(trans->dev_cmd_pool);
 114 }
 115
 116 int iwl_trans_send_cmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
 117 {
 118         int ret;
 119
 120         if (unlikely(!(cmd->flags & CMD_SEND_IN_RFKILL) &&
 121                      test_bit(STATUS_RFKILL, &trans->status)))
 122                 return -ERFKILL;
 123
 124         if (unlikely(test_bit(STATUS_FW_ERROR, &trans->status)))
 125                 return -EIO;
 126
 127         if (unlikely(trans->state != IWL_TRANS_FW_ALIVE)) {
 128                 IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
 129                 return -EIO;
 130         }
 131
 132         if (WARN_ON((cmd->flags & CMD_WANT_ASYNC_CALLBACK) &&
 133                     !(cmd->flags & CMD_ASYNC)))
 134                 return -EINVAL;
 135
 136         if (!(cmd->flags & CMD_ASYNC))
 137                 lock_map_acquire_read(&trans->sync_cmd_lockdep_map);
 138
 139         if (trans->wide_cmd_header && !iwl_cmd_groupid(cmd->id))
 140                 cmd->id = DEF_ID(cmd->id);
 141
 142         ret = trans->ops->send_cmd(trans, cmd);
 143
 144         if (!(cmd->flags & CMD_ASYNC))
 145                 lock_map_release(&trans->sync_cmd_lockdep_map);
 146
 147         return ret;
 148 }
 149 IWL_EXPORT_SYMBOL(iwl_trans_send_cmd);
 150
 151 /* Comparator for struct iwl_hcmd_names.
 152  * Used in the binary search over a list of host commands.
 153  *
 154  * @key: command_id that we're looking for.
 155  * @elt: struct iwl_hcmd_names candidate for match.
 156  *
 157  * @return 0 iff equal.
 158  */
 159 static int iwl_hcmd_names_cmp(const void *key, const void *elt)
 160 {
 161         const struct iwl_hcmd_names *name = elt;
 162         u8 cmd1 = *(u8 *)key;
 163         u8 cmd2 = name->cmd_id;
 164
 165         return (cmd1 - cmd2);
 166 }
 167
 168 const char *iwl_get_cmd_string(struct iwl_trans *trans, u32 id)
 169 {
 170         u8 grp, cmd;
 171         struct iwl_hcmd_names *ret;
 172         const struct iwl_hcmd_arr *arr;
 173         size_t size = sizeof(struct iwl_hcmd_names);
 174
 175         grp = iwl_cmd_groupid(id);
 176         cmd = iwl_cmd_opcode(id);
 177
 178         if (!trans->command_groups || grp >= trans->command_groups_size ||
 179             !trans->command_groups[grp].arr)
 180                 return "UNKNOWN";
 181
 182         arr = &trans->command_groups[grp];
 183         ret = bsearch(&cmd, arr->arr, arr->size, size, iwl_hcmd_names_cmp);
 184         if (!ret)
 185                 return "UNKNOWN";
 186         return ret->cmd_name;
 187 }
 188 IWL_EXPORT_SYMBOL(iwl_get_cmd_string);
 189
 190 int iwl_cmd_groups_verify_sorted(const struct iwl_trans_config *trans)
 191 {
 192         int i, j;
 193         const struct iwl_hcmd_arr *arr;
 194
 195         for (i = 0; i < trans->command_groups_size; i++) {
 196                 arr = &trans->command_groups[i];
 197                 if (!arr->arr)
 198                         continue;
 199                 for (j = 0; j < arr->size - 1; j++)
 200                         if (arr->arr[j].cmd_id > arr->arr[j + 1].cmd_id)
 201                                 return -1;
 202         }
 203         return 0;
 204 }
 205 IWL_EXPORT_SYMBOL(iwl_cmd_groups_verify_sorted);