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
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * The full GNU General Public License is included in this distribution
  21  * in the file called COPYING.
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  23  * Contact Information:
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  26  *
  27  * BSD LICENSE
  28  *
  29  * Copyright(c) 2015 Intel Mobile Communications GmbH
  30  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
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  34  * modification, are permitted provided that the following conditions
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  38  *    notice, this list of conditions and the following disclaimer.
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  40  *    notice, this list of conditions and the following disclaimer in
  41  *    the documentation and/or other materials provided with the
  42  *    distribution.
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  44  *    contributors may be used to endorse or promote products derived
  45  *    from this software without specific prior written permission.
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  48  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  49  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  50  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  51  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  57  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  58  *
  59  *****************************************************************************/
  60 #include <linux/kernel.h>
  61 #include <linux/bsearch.h>
  62
  63 #include "iwl-trans.h"
  64 #include "iwl-drv.h"
  65 #include "iwl-fh.h"
  66
  67 struct iwl_trans *iwl_trans_alloc(unsigned int priv_size,
  68                                   struct device *dev,
  69                                   const struct iwl_cfg *cfg,
  70                                   const struct iwl_trans_ops *ops)
  71 {
  72         struct iwl_trans *trans;
  73 #ifdef CONFIG_LOCKDEP
  74         static struct lock_class_key __key;
  75 #endif
  76
  77         trans = devm_kzalloc(dev, sizeof(*trans) + priv_size, GFP_KERNEL);
  78         if (!trans)
  79                 return NULL;
  80
  81 #ifdef CONFIG_LOCKDEP
  82         lockdep_init_map(&trans->sync_cmd_lockdep_map, "sync_cmd_lockdep_map",
  83                          &__key, 0);
  84 #endif
  85
  86         trans->dev = dev;
  87         trans->cfg = cfg;
  88         trans->ops = ops;
  89         trans->num_rx_queues = 1;
  90
  91         snprintf(trans->dev_cmd_pool_name, sizeof(trans->dev_cmd_pool_name),
  92                  "iwl_cmd_pool:%s", dev_name(trans->dev));
  93         trans->dev_cmd_pool =
  94                 kmem_cache_create(trans->dev_cmd_pool_name,
  95                                   sizeof(struct iwl_device_cmd),
  96                                   sizeof(void *),
  97                                   SLAB_HWCACHE_ALIGN,
  98                                   NULL);
  99         if (!trans->dev_cmd_pool)
 100                 return NULL;
 101
 102         WARN_ON(!ops->wait_txq_empty && !ops->wait_tx_queues_empty);
 103
 104         return trans;
 105 }
 106
 107 void iwl_trans_free(struct iwl_trans *trans)
 108 {
 109         kmem_cache_destroy(trans->dev_cmd_pool);
 110 }
 111
 112 int iwl_trans_send_cmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
 113 {
 114         int ret;
 115
 116         if (unlikely(!(cmd->flags & CMD_SEND_IN_RFKILL) &&
 117                      test_bit(STATUS_RFKILL_OPMODE, &trans->status)))
 118                 return -ERFKILL;
 119
 120         if (unlikely(test_bit(STATUS_FW_ERROR, &trans->status)))
 121                 return -EIO;
 122
 123         if (unlikely(trans->state != IWL_TRANS_FW_ALIVE)) {
 124                 IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
 125                 return -EIO;
 126         }
 127
 128         if (WARN_ON((cmd->flags & CMD_WANT_ASYNC_CALLBACK) &&
 129                     !(cmd->flags & CMD_ASYNC)))
 130                 return -EINVAL;
 131
 132         if (!(cmd->flags & CMD_ASYNC))
 133                 lock_map_acquire_read(&trans->sync_cmd_lockdep_map);
 134
 135         if (trans->wide_cmd_header && !iwl_cmd_groupid(cmd->id))
 136                 cmd->id = DEF_ID(cmd->id);
 137
 138         ret = trans->ops->send_cmd(trans, cmd);
 139
 140         if (!(cmd->flags & CMD_ASYNC))
 141                 lock_map_release(&trans->sync_cmd_lockdep_map);
 142
 143         if (WARN_ON((cmd->flags & CMD_WANT_SKB) && !ret && !cmd->resp_pkt))
 144                 return -EIO;
 145
 146         return ret;
 147 }
 148 IWL_EXPORT_SYMBOL(iwl_trans_send_cmd);
 149
 150 /* Comparator for struct iwl_hcmd_names.
 151  * Used in the binary search over a list of host commands.
 152  *
 153  * @key: command_id that we're looking for.
 154  * @elt: struct iwl_hcmd_names candidate for match.
 155  *
 156  * @return 0 iff equal.
 157  */
 158 static int iwl_hcmd_names_cmp(const void *key, const void *elt)
 159 {
 160         const struct iwl_hcmd_names *name = elt;
 161         u8 cmd1 = *(u8 *)key;
 162         u8 cmd2 = name->cmd_id;
 163
 164         return (cmd1 - cmd2);
 165 }
 166
 167 const char *iwl_get_cmd_string(struct iwl_trans *trans, u32 id)
 168 {
 169         u8 grp, cmd;
 170         struct iwl_hcmd_names *ret;
 171         const struct iwl_hcmd_arr *arr;
 172         size_t size = sizeof(struct iwl_hcmd_names);
 173
 174         grp = iwl_cmd_groupid(id);
 175         cmd = iwl_cmd_opcode(id);
 176
 177         if (!trans->command_groups || grp >= trans->command_groups_size ||
 178             !trans->command_groups[grp].arr)
 179                 return "UNKNOWN";
 180
 181         arr = &trans->command_groups[grp];
 182         ret = bsearch(&cmd, arr->arr, arr->size, size, iwl_hcmd_names_cmp);
 183         if (!ret)
 184                 return "UNKNOWN";
 185         return ret->cmd_name;
 186 }
 187 IWL_EXPORT_SYMBOL(iwl_get_cmd_string);
 188
 189 int iwl_cmd_groups_verify_sorted(const struct iwl_trans_config *trans)
 190 {
 191         int i, j;
 192         const struct iwl_hcmd_arr *arr;
 193
 194         for (i = 0; i < trans->command_groups_size; i++) {
 195                 arr = &trans->command_groups[i];
 196                 if (!arr->arr)
 197                         continue;
 198                 for (j = 0; j < arr->size - 1; j++)
 199                         if (arr->arr[j].cmd_id > arr->arr[j + 1].cmd_id)
 200                                 return -1;
 201         }
 202         return 0;
 203 }
 204 IWL_EXPORT_SYMBOL(iwl_cmd_groups_verify_sorted);
 205
 206 void iwl_trans_ref(struct iwl_trans *trans)
 207 {
 208         if (trans->ops->ref)
 209                 trans->ops->ref(trans);
 210 }
 211 IWL_EXPORT_SYMBOL(iwl_trans_ref);
 212
 213 void iwl_trans_unref(struct iwl_trans *trans)
 214 {
 215         if (trans->ops->unref)
 216                 trans->ops->unref(trans);
 217 }
 218 IWL_EXPORT_SYMBOL(iwl_trans_unref);