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

   1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
   2 /*
   3  * Copyright (C) 2015 Intel Mobile Communications GmbH
   4  * Copyright (C) 2016-2017 Intel Deutschland GmbH
   5  * Copyright (C) 2019-2021 Intel Corporation
   6  */
   7 #include <linux/kernel.h>
   8 #include <linux/bsearch.h>
   9
  10 #include "fw/api/tx.h"
  11 #include "iwl-trans.h"
  12 #include "iwl-drv.h"
  13 #include "iwl-fh.h"
  14 #include "queue/tx.h"
  15 #include <linux/dmapool.h>
  16 #include "fw/api/commands.h"
  17
  18 struct iwl_trans *iwl_trans_alloc(unsigned int priv_size,
  19                                   struct device *dev,
  20                                   const struct iwl_trans_ops *ops,
  21                                   const struct iwl_cfg_trans_params *cfg_trans)
  22 {
  23         struct iwl_trans *trans;
  24 #ifdef CONFIG_LOCKDEP
  25         static struct lock_class_key __key;
  26 #endif
  27
  28         trans = devm_kzalloc(dev, sizeof(*trans) + priv_size, GFP_KERNEL);
  29         if (!trans)
  30                 return NULL;
  31
  32         trans->trans_cfg = cfg_trans;
  33
  34 #ifdef CONFIG_LOCKDEP
  35         lockdep_init_map(&trans->sync_cmd_lockdep_map, "sync_cmd_lockdep_map",
  36                          &__key, 0);
  37 #endif
  38
  39         trans->dev = dev;
  40         trans->ops = ops;
  41         trans->num_rx_queues = 1;
  42
  43         WARN_ON(!ops->wait_txq_empty && !ops->wait_tx_queues_empty);
  44
  45         if (trans->trans_cfg->use_tfh) {
  46                 trans->txqs.tfd.addr_size = 64;
  47                 trans->txqs.tfd.max_tbs = IWL_TFH_NUM_TBS;
  48                 trans->txqs.tfd.size = sizeof(struct iwl_tfh_tfd);
  49         } else {
  50                 trans->txqs.tfd.addr_size = 36;
  51                 trans->txqs.tfd.max_tbs = IWL_NUM_OF_TBS;
  52                 trans->txqs.tfd.size = sizeof(struct iwl_tfd);
  53         }
  54         trans->max_skb_frags = IWL_TRANS_MAX_FRAGS(trans);
  55
  56         return trans;
  57 }
  58
  59 int iwl_trans_init(struct iwl_trans *trans)
  60 {
  61         int txcmd_size, txcmd_align;
  62
  63         if (!trans->trans_cfg->gen2) {
  64                 txcmd_size = sizeof(struct iwl_tx_cmd);
  65                 txcmd_align = sizeof(void *);
  66         } else if (trans->trans_cfg->device_family < IWL_DEVICE_FAMILY_AX210) {
  67                 txcmd_size = sizeof(struct iwl_tx_cmd_gen2);
  68                 txcmd_align = 64;
  69         } else {
  70                 txcmd_size = sizeof(struct iwl_tx_cmd_gen3);
  71                 txcmd_align = 128;
  72         }
  73
  74         txcmd_size += sizeof(struct iwl_cmd_header);
  75         txcmd_size += 36; /* biggest possible 802.11 header */
  76
  77         /* Ensure device TX cmd cannot reach/cross a page boundary in gen2 */
  78         if (WARN_ON(trans->trans_cfg->gen2 && txcmd_size >= txcmd_align))
  79                 return -EINVAL;
  80
  81         if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210)
  82                 trans->txqs.bc_tbl_size = sizeof(struct iwl_gen3_bc_tbl);
  83         else
  84                 trans->txqs.bc_tbl_size = sizeof(struct iwlagn_scd_bc_tbl);
  85         /*
  86          * For gen2 devices, we use a single allocation for each byte-count
  87          * table, but they're pretty small (1k) so use a DMA pool that we
  88          * allocate here.
  89          */
  90         if (trans->trans_cfg->gen2) {
  91                 trans->txqs.bc_pool = dmam_pool_create("iwlwifi:bc", trans->dev,
  92                                                        trans->txqs.bc_tbl_size,
  93                                                        256, 0);
  94                 if (!trans->txqs.bc_pool)
  95                         return -ENOMEM;
  96         }
  97
  98         /* Some things must not change even if the config does */
  99         WARN_ON(trans->txqs.tfd.addr_size !=
 100                 (trans->trans_cfg->use_tfh ? 64 : 36));
 101
 102         snprintf(trans->dev_cmd_pool_name, sizeof(trans->dev_cmd_pool_name),
 103                  "iwl_cmd_pool:%s", dev_name(trans->dev));
 104         trans->dev_cmd_pool =
 105                 kmem_cache_create(trans->dev_cmd_pool_name,
 106                                   txcmd_size, txcmd_align,
 107                                   SLAB_HWCACHE_ALIGN, NULL);
 108         if (!trans->dev_cmd_pool)
 109                 return -ENOMEM;
 110
 111         trans->txqs.tso_hdr_page = alloc_percpu(struct iwl_tso_hdr_page);
 112         if (!trans->txqs.tso_hdr_page) {
 113                 kmem_cache_destroy(trans->dev_cmd_pool);
 114                 return -ENOMEM;
 115         }
 116
 117         /* Initialize the wait queue for commands */
 118         init_waitqueue_head(&trans->wait_command_queue);
 119
 120         return 0;
 121 }
 122
 123 void iwl_trans_free(struct iwl_trans *trans)
 124 {
 125         int i;
 126
 127         if (trans->txqs.tso_hdr_page) {
 128                 for_each_possible_cpu(i) {
 129                         struct iwl_tso_hdr_page *p =
 130                                 per_cpu_ptr(trans->txqs.tso_hdr_page, i);
 131
 132                         if (p && p->page)
 133                                 __free_page(p->page);
 134                 }
 135
 136                 free_percpu(trans->txqs.tso_hdr_page);
 137         }
 138
 139         kmem_cache_destroy(trans->dev_cmd_pool);
 140 }
 141
 142 int iwl_trans_send_cmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
 143 {
 144         int ret;
 145
 146         if (unlikely(!(cmd->flags & CMD_SEND_IN_RFKILL) &&
 147                      test_bit(STATUS_RFKILL_OPMODE, &trans->status)))
 148                 return -ERFKILL;
 149
 150         /*
 151          * We can't test IWL_MVM_STATUS_IN_D3 in mvm->status because this
 152          * bit is set early in the D3 flow, before we send all the commands
 153          * that configure the firmware for D3 operation (power, patterns, ...)
 154          * and we don't want to flag all those with CMD_SEND_IN_D3.
 155          * So use the system_pm_mode instead. The only command sent after
 156          * we set system_pm_mode is D3_CONFIG_CMD, which we now flag with
 157          * CMD_SEND_IN_D3.
 158          */
 159         if (unlikely(trans->system_pm_mode == IWL_PLAT_PM_MODE_D3 &&
 160                      !(cmd->flags & CMD_SEND_IN_D3)))
 161                 return -EHOSTDOWN;
 162
 163         if (unlikely(test_bit(STATUS_FW_ERROR, &trans->status)))
 164                 return -EIO;
 165
 166         if (unlikely(trans->state != IWL_TRANS_FW_ALIVE)) {
 167                 IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
 168                 return -EIO;
 169         }
 170
 171         if (WARN_ON((cmd->flags & CMD_WANT_ASYNC_CALLBACK) &&
 172                     !(cmd->flags & CMD_ASYNC)))
 173                 return -EINVAL;
 174
 175         if (!(cmd->flags & CMD_ASYNC))
 176                 lock_map_acquire_read(&trans->sync_cmd_lockdep_map);
 177
 178         if (trans->wide_cmd_header && !iwl_cmd_groupid(cmd->id)) {
 179                 if (cmd->id != REPLY_ERROR)
 180                         cmd->id = DEF_ID(cmd->id);
 181         }
 182
 183         ret = iwl_trans_txq_send_hcmd(trans, cmd);
 184
 185         if (!(cmd->flags & CMD_ASYNC))
 186                 lock_map_release(&trans->sync_cmd_lockdep_map);
 187
 188         if (WARN_ON((cmd->flags & CMD_WANT_SKB) && !ret && !cmd->resp_pkt))
 189                 return -EIO;
 190
 191         return ret;
 192 }
 193 IWL_EXPORT_SYMBOL(iwl_trans_send_cmd);
 194
 195 /* Comparator for struct iwl_hcmd_names.
 196  * Used in the binary search over a list of host commands.
 197  *
 198  * @key: command_id that we're looking for.
 199  * @elt: struct iwl_hcmd_names candidate for match.
 200  *
 201  * @return 0 iff equal.
 202  */
 203 static int iwl_hcmd_names_cmp(const void *key, const void *elt)
 204 {
 205         const struct iwl_hcmd_names *name = elt;
 206         u8 cmd1 = *(u8 *)key;
 207         u8 cmd2 = name->cmd_id;
 208
 209         return (cmd1 - cmd2);
 210 }
 211
 212 const char *iwl_get_cmd_string(struct iwl_trans *trans, u32 id)
 213 {
 214         u8 grp, cmd;
 215         struct iwl_hcmd_names *ret;
 216         const struct iwl_hcmd_arr *arr;
 217         size_t size = sizeof(struct iwl_hcmd_names);
 218
 219         grp = iwl_cmd_groupid(id);
 220         cmd = iwl_cmd_opcode(id);
 221
 222         if (!trans->command_groups || grp >= trans->command_groups_size ||
 223             !trans->command_groups[grp].arr)
 224                 return "UNKNOWN";
 225
 226         arr = &trans->command_groups[grp];
 227         ret = bsearch(&cmd, arr->arr, arr->size, size, iwl_hcmd_names_cmp);
 228         if (!ret)
 229                 return "UNKNOWN";
 230         return ret->cmd_name;
 231 }
 232 IWL_EXPORT_SYMBOL(iwl_get_cmd_string);
 233
 234 int iwl_cmd_groups_verify_sorted(const struct iwl_trans_config *trans)
 235 {
 236         int i, j;
 237         const struct iwl_hcmd_arr *arr;
 238
 239         for (i = 0; i < trans->command_groups_size; i++) {
 240                 arr = &trans->command_groups[i];
 241                 if (!arr->arr)
 242                         continue;
 243                 for (j = 0; j < arr->size - 1; j++)
 244                         if (arr->arr[j].cmd_id > arr->arr[j + 1].cmd_id)
 245                                 return -1;
 246         }
 247         return 0;
 248 }
 249 IWL_EXPORT_SYMBOL(iwl_cmd_groups_verify_sorted);