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.
  22  *
  23  * Contact Information:
  24  *  Intel Linux Wireless <linuxwifi@intel.com>
  25  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26  *
  27  * BSD LICENSE
  28  *
  29  * Copyright(c) 2015 Intel Mobile Communications GmbH
  30  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  31  * All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  *
  37  *  * Redistributions of source code must retain the above copyright
  38  *    notice, this list of conditions and the following disclaimer.
  39  *  * Redistributions in binary form must reproduce the above copyright
  40  *    notice, this list of conditions and the following disclaimer in
  41  *    the documentation and/or other materials provided with the
  42  *    distribution.
  43  *  * Neither the name Intel Corporation nor the names of its
  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,
  52  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  53  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  54  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  55  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  56  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  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_trans_ops *ops,
  70                                   unsigned int cmd_pool_size,
  71                                   unsigned int cmd_pool_align)
  72 {
  73         struct iwl_trans *trans;
  74 #ifdef CONFIG_LOCKDEP
  75         static struct lock_class_key __key;
  76 #endif
  77
  78         trans = devm_kzalloc(dev, sizeof(*trans) + priv_size, GFP_KERNEL);
  79         if (!trans)
  80                 return NULL;
  81
  82 #ifdef CONFIG_LOCKDEP
  83         lockdep_init_map(&trans->sync_cmd_lockdep_map, "sync_cmd_lockdep_map",
  84                          &__key, 0);
  85 #endif
  86
  87         trans->dev = dev;
  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                                   cmd_pool_size, cmd_pool_align,
  96                                   SLAB_HWCACHE_ALIGN, NULL);
  97         if (!trans->dev_cmd_pool)
  98                 return NULL;
  99
 100         WARN_ON(!ops->wait_txq_empty && !ops->wait_tx_queues_empty);
 101
 102         return trans;
 103 }
 104
 105 void iwl_trans_free(struct iwl_trans *trans)
 106 {
 107         kmem_cache_destroy(trans->dev_cmd_pool);
 108 }
 109
 110 int iwl_trans_send_cmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
 111 {
 112         int ret;
 113
 114         if (unlikely(!(cmd->flags & CMD_SEND_IN_RFKILL) &&
 115                      test_bit(STATUS_RFKILL_OPMODE, &trans->status)))
 116                 return -ERFKILL;
 117
 118         if (unlikely(test_bit(STATUS_FW_ERROR, &trans->status)))
 119                 return -EIO;
 120
 121         if (unlikely(trans->state != IWL_TRANS_FW_ALIVE)) {
 122                 IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
 123                 return -EIO;
 124         }
 125
 126         if (WARN_ON((cmd->flags & CMD_WANT_ASYNC_CALLBACK) &&
 127                     !(cmd->flags & CMD_ASYNC)))
 128                 return -EINVAL;
 129
 130         if (!(cmd->flags & CMD_ASYNC))
 131                 lock_map_acquire_read(&trans->sync_cmd_lockdep_map);
 132
 133         if (trans->wide_cmd_header && !iwl_cmd_groupid(cmd->id))
 134                 cmd->id = DEF_ID(cmd->id);
 135
 136         ret = trans->ops->send_cmd(trans, cmd);
 137
 138         if (!(cmd->flags & CMD_ASYNC))
 139                 lock_map_release(&trans->sync_cmd_lockdep_map);
 140
 141         if (WARN_ON((cmd->flags & CMD_WANT_SKB) && !ret && !cmd->resp_pkt))
 142                 return -EIO;
 143
 144         return ret;
 145 }
 146 IWL_EXPORT_SYMBOL(iwl_trans_send_cmd);
 147
 148 /* Comparator for struct iwl_hcmd_names.
 149  * Used in the binary search over a list of host commands.
 150  *
 151  * @key: command_id that we're looking for.
 152  * @elt: struct iwl_hcmd_names candidate for match.
 153  *
 154  * @return 0 iff equal.
 155  */
 156 static int iwl_hcmd_names_cmp(const void *key, const void *elt)
 157 {
 158         const struct iwl_hcmd_names *name = elt;
 159         u8 cmd1 = *(u8 *)key;
 160         u8 cmd2 = name->cmd_id;
 161
 162         return (cmd1 - cmd2);
 163 }
 164
 165 const char *iwl_get_cmd_string(struct iwl_trans *trans, u32 id)
 166 {
 167         u8 grp, cmd;
 168         struct iwl_hcmd_names *ret;
 169         const struct iwl_hcmd_arr *arr;
 170         size_t size = sizeof(struct iwl_hcmd_names);
 171
 172         grp = iwl_cmd_groupid(id);
 173         cmd = iwl_cmd_opcode(id);
 174
 175         if (!trans->command_groups || grp >= trans->command_groups_size ||
 176             !trans->command_groups[grp].arr)
 177                 return "UNKNOWN";
 178
 179         arr = &trans->command_groups[grp];
 180         ret = bsearch(&cmd, arr->arr, arr->size, size, iwl_hcmd_names_cmp);
 181         if (!ret)
 182                 return "UNKNOWN";
 183         return ret->cmd_name;
 184 }
 185 IWL_EXPORT_SYMBOL(iwl_get_cmd_string);
 186
 187 int iwl_cmd_groups_verify_sorted(const struct iwl_trans_config *trans)
 188 {
 189         int i, j;
 190         const struct iwl_hcmd_arr *arr;
 191
 192         for (i = 0; i < trans->command_groups_size; i++) {
 193                 arr = &trans->command_groups[i];
 194                 if (!arr->arr)
 195                         continue;
 196                 for (j = 0; j < arr->size - 1; j++)
 197                         if (arr->arr[j].cmd_id > arr->arr[j + 1].cmd_id)
 198                                 return -1;
 199         }
 200         return 0;
 201 }
 202 IWL_EXPORT_SYMBOL(iwl_cmd_groups_verify_sorted);