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_BZ)
  82                 trans->txqs.bc_tbl_size =
  83                         sizeof(struct iwl_gen3_bc_tbl_entry) * TFD_QUEUE_BC_SIZE_GEN3_BZ;
  84         else if (trans->trans_cfg->device_family >= IWL_DEVICE_FAMILY_AX210)
  85                 trans->txqs.bc_tbl_size =
  86                         sizeof(struct iwl_gen3_bc_tbl_entry) * TFD_QUEUE_BC_SIZE_GEN3_AX210;
  87         else
  88                 trans->txqs.bc_tbl_size = sizeof(struct iwlagn_scd_bc_tbl);
  89         /*
  90          * For gen2 devices, we use a single allocation for each byte-count
  91          * table, but they're pretty small (1k) so use a DMA pool that we
  92          * allocate here.
  93          */
  94         if (trans->trans_cfg->gen2) {
  95                 trans->txqs.bc_pool = dmam_pool_create("iwlwifi:bc", trans->dev,
  96                                                        trans->txqs.bc_tbl_size,
  97                                                        256, 0);
  98                 if (!trans->txqs.bc_pool)
  99                         return -ENOMEM;
 100         }
 101
 102         /* Some things must not change even if the config does */
 103         WARN_ON(trans->txqs.tfd.addr_size !=
 104                 (trans->trans_cfg->use_tfh ? 64 : 36));
 105
 106         snprintf(trans->dev_cmd_pool_name, sizeof(trans->dev_cmd_pool_name),
 107                  "iwl_cmd_pool:%s", dev_name(trans->dev));
 108         trans->dev_cmd_pool =
 109                 kmem_cache_create(trans->dev_cmd_pool_name,
 110                                   txcmd_size, txcmd_align,
 111                                   SLAB_HWCACHE_ALIGN, NULL);
 112         if (!trans->dev_cmd_pool)
 113                 return -ENOMEM;
 114
 115         trans->txqs.tso_hdr_page = alloc_percpu(struct iwl_tso_hdr_page);
 116         if (!trans->txqs.tso_hdr_page) {
 117                 kmem_cache_destroy(trans->dev_cmd_pool);
 118                 return -ENOMEM;
 119         }
 120
 121         /* Initialize the wait queue for commands */
 122         init_waitqueue_head(&trans->wait_command_queue);
 123
 124         return 0;
 125 }
 126
 127 void iwl_trans_free(struct iwl_trans *trans)
 128 {
 129         int i;
 130
 131         if (trans->txqs.tso_hdr_page) {
 132                 for_each_possible_cpu(i) {
 133                         struct iwl_tso_hdr_page *p =
 134                                 per_cpu_ptr(trans->txqs.tso_hdr_page, i);
 135
 136                         if (p && p->page)
 137                                 __free_page(p->page);
 138                 }
 139
 140                 free_percpu(trans->txqs.tso_hdr_page);
 141         }
 142
 143         kmem_cache_destroy(trans->dev_cmd_pool);
 144 }
 145
 146 int iwl_trans_send_cmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
 147 {
 148         int ret;
 149
 150         if (unlikely(!(cmd->flags & CMD_SEND_IN_RFKILL) &&
 151                      test_bit(STATUS_RFKILL_OPMODE, &trans->status)))
 152                 return -ERFKILL;
 153
 154         /*
 155          * We can't test IWL_MVM_STATUS_IN_D3 in mvm->status because this
 156          * bit is set early in the D3 flow, before we send all the commands
 157          * that configure the firmware for D3 operation (power, patterns, ...)
 158          * and we don't want to flag all those with CMD_SEND_IN_D3.
 159          * So use the system_pm_mode instead. The only command sent after
 160          * we set system_pm_mode is D3_CONFIG_CMD, which we now flag with
 161          * CMD_SEND_IN_D3.
 162          */
 163         if (unlikely(trans->system_pm_mode == IWL_PLAT_PM_MODE_D3 &&
 164                      !(cmd->flags & CMD_SEND_IN_D3)))
 165                 return -EHOSTDOWN;
 166
 167         if (unlikely(test_bit(STATUS_FW_ERROR, &trans->status)))
 168                 return -EIO;
 169
 170         if (unlikely(trans->state != IWL_TRANS_FW_ALIVE)) {
 171                 IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
 172                 return -EIO;
 173         }
 174
 175         if (WARN_ON((cmd->flags & CMD_WANT_ASYNC_CALLBACK) &&
 176                     !(cmd->flags & CMD_ASYNC)))
 177                 return -EINVAL;
 178
 179         if (!(cmd->flags & CMD_ASYNC))
 180                 lock_map_acquire_read(&trans->sync_cmd_lockdep_map);
 181
 182         if (trans->wide_cmd_header && !iwl_cmd_groupid(cmd->id)) {
 183                 if (cmd->id != REPLY_ERROR)
 184                         cmd->id = DEF_ID(cmd->id);
 185         }
 186
 187         ret = iwl_trans_txq_send_hcmd(trans, cmd);
 188
 189         if (!(cmd->flags & CMD_ASYNC))
 190                 lock_map_release(&trans->sync_cmd_lockdep_map);
 191
 192         if (WARN_ON((cmd->flags & CMD_WANT_SKB) && !ret && !cmd->resp_pkt))
 193                 return -EIO;
 194
 195         return ret;
 196 }
 197 IWL_EXPORT_SYMBOL(iwl_trans_send_cmd);
 198
 199 /* Comparator for struct iwl_hcmd_names.
 200  * Used in the binary search over a list of host commands.
 201  *
 202  * @key: command_id that we're looking for.
 203  * @elt: struct iwl_hcmd_names candidate for match.
 204  *
 205  * @return 0 iff equal.
 206  */
 207 static int iwl_hcmd_names_cmp(const void *key, const void *elt)
 208 {
 209         const struct iwl_hcmd_names *name = elt;
 210         const u8 *cmd1 = key;
 211         u8 cmd2 = name->cmd_id;
 212
 213         return (*cmd1 - cmd2);
 214 }
 215
 216 const char *iwl_get_cmd_string(struct iwl_trans *trans, u32 id)
 217 {
 218         u8 grp, cmd;
 219         struct iwl_hcmd_names *ret;
 220         const struct iwl_hcmd_arr *arr;
 221         size_t size = sizeof(struct iwl_hcmd_names);
 222
 223         grp = iwl_cmd_groupid(id);
 224         cmd = iwl_cmd_opcode(id);
 225
 226         if (!trans->command_groups || grp >= trans->command_groups_size ||
 227             !trans->command_groups[grp].arr)
 228                 return "UNKNOWN";
 229
 230         arr = &trans->command_groups[grp];
 231         ret = bsearch(&cmd, arr->arr, arr->size, size, iwl_hcmd_names_cmp);
 232         if (!ret)
 233                 return "UNKNOWN";
 234         return ret->cmd_name;
 235 }
 236 IWL_EXPORT_SYMBOL(iwl_get_cmd_string);
 237
 238 int iwl_cmd_groups_verify_sorted(const struct iwl_trans_config *trans)
 239 {
 240         int i, j;
 241         const struct iwl_hcmd_arr *arr;
 242
 243         for (i = 0; i < trans->command_groups_size; i++) {
 244                 arr = &trans->command_groups[i];
 245                 if (!arr->arr)
 246                         continue;
 247                 for (j = 0; j < arr->size - 1; j++)
 248                         if (arr->arr[j].cmd_id > arr->arr[j + 1].cmd_id)
 249                                 return -1;
 250         }
 251         return 0;
 252 }
 253 IWL_EXPORT_SYMBOL(iwl_cmd_groups_verify_sorted);