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
iwl_trans_alloc(unsigned int priv_size,struct device * dev,const struct iwl_trans_ops * ops,const struct iwl_cfg_trans_params * cfg_trans)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
iwl_trans_init(struct iwl_trans * trans)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
iwl_trans_free(struct iwl_trans * trans)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
iwl_trans_send_cmd(struct iwl_trans * trans,struct iwl_host_cmd * cmd)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 */
iwl_hcmd_names_cmp(const void * key,const void * elt)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
iwl_get_cmd_string(struct iwl_trans * trans,u32 id)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
iwl_cmd_groups_verify_sorted(const struct iwl_trans_config * trans)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);
254