summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c
blob: 334d1f59f6e4679fa36f72717d6ce45d29b88e28 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright (C) 2012-2014, 2018-2023 Intel Corporation
 * Copyright (C) 2013-2014 Intel Mobile Communications GmbH
 * Copyright (C) 2017 Intel Deutschland GmbH
 */
#include <net/mac80211.h>
#include "fw-api.h"
#include "mvm.h"

/* Maps the driver specific channel width definition to the fw values */
u8 iwl_mvm_get_channel_width(struct cfg80211_chan_def *chandef)
{
	switch (chandef->width) {
	case NL80211_CHAN_WIDTH_20_NOHT:
	case NL80211_CHAN_WIDTH_20:
		return IWL_PHY_CHANNEL_MODE20;
	case NL80211_CHAN_WIDTH_40:
		return IWL_PHY_CHANNEL_MODE40;
	case NL80211_CHAN_WIDTH_80:
		return IWL_PHY_CHANNEL_MODE80;
	case NL80211_CHAN_WIDTH_160:
		return IWL_PHY_CHANNEL_MODE160;
	case NL80211_CHAN_WIDTH_320:
		return IWL_PHY_CHANNEL_MODE320;
	default:
		WARN(1, "Invalid channel width=%u", chandef->width);
		return IWL_PHY_CHANNEL_MODE20;
	}
}

/*
 * Maps the driver specific control channel position (relative to the center
 * freq) definitions to the the fw values
 */
u8 iwl_mvm_get_ctrl_pos(struct cfg80211_chan_def *chandef)
{
	int offs = chandef->chan->center_freq - chandef->center_freq1;
	int abs_offs = abs(offs);
	u8 ret;

	if (offs == 0) {
		/*
		 * The FW is expected to check the control channel position only
		 * when in HT/VHT and the channel width is not 20MHz. Return
		 * this value as the default one.
		 */
		return 0;
	}

	/* this results in a value 0-7, i.e. fitting into 0b0111 */
	ret = (abs_offs - 10) / 20;
	/*
	 * But we need the value to be in 0b1011 because 0b0100 is
	 * IWL_PHY_CTRL_POS_ABOVE, so shift bit 2 up to land in
	 * IWL_PHY_CTRL_POS_OFFS_EXT (0b1000)
	 */
	ret = (ret & IWL_PHY_CTRL_POS_OFFS_MSK) |
	      ((ret & BIT(2)) << 1);
	/* and add the above bit */
	ret |= (offs > 0) * IWL_PHY_CTRL_POS_ABOVE;

	return ret;
}

/*
 * Construct the generic fields of the PHY context command
 */
static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt,
				     struct iwl_phy_context_cmd *cmd,
				     u32 action)
{
	cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id,
							    ctxt->color));
	cmd->action = cpu_to_le32(action);
}

static void iwl_mvm_phy_ctxt_set_rxchain(struct iwl_mvm *mvm,
					 struct iwl_mvm_phy_ctxt *ctxt,
					 __le32 *rxchain_info,
					 u8 chains_static,
					 u8 chains_dynamic)
{
	u8 active_cnt, idle_cnt;

	/* Set rx the chains */
	idle_cnt = chains_static;
	active_cnt = chains_dynamic;

	/* In scenarios where we only ever use a single-stream rates,
	 * i.e. legacy 11b/g/a associations, single-stream APs or even
	 * static SMPS, enable both chains to get diversity, improving
	 * the case where we're far enough from the AP that attenuation
	 * between the two antennas is sufficiently different to impact
	 * performance.
	 */
	if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm, ctxt)) {
		idle_cnt = 2;
		active_cnt = 2;
	}

	*rxchain_info = cpu_to_le32(iwl_mvm_get_valid_rx_ant(mvm) <<
					PHY_RX_CHAIN_VALID_POS);
	*rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
	*rxchain_info |= cpu_to_le32(active_cnt <<
					 PHY_RX_CHAIN_MIMO_CNT_POS);
#ifdef CONFIG_IWLWIFI_DEBUGFS
	if (unlikely(mvm->dbgfs_rx_phyinfo))
		*rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo);
#endif
}

/*
 * Add the phy configuration to the PHY context command
 */
static void iwl_mvm_phy_ctxt_cmd_data_v1(struct iwl_mvm *mvm,
					 struct iwl_mvm_phy_ctxt *ctxt,
					 struct iwl_phy_context_cmd_v1 *cmd,
					 struct cfg80211_chan_def *chandef,
					 u8 chains_static, u8 chains_dynamic)
{
	struct iwl_phy_context_cmd_tail *tail =
		iwl_mvm_chan_info_cmd_tail(mvm, &cmd->ci);

	/* Set the channel info data */
	iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);

	iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &tail->rxchain_info,
				     chains_static, chains_dynamic);

	tail->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
}

/*
 * Add the phy configuration to the PHY context command
 */
static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm,
				      struct iwl_mvm_phy_ctxt *ctxt,
				      struct iwl_phy_context_cmd *cmd,
				      struct cfg80211_chan_def *chandef,
				      u8 chains_static, u8 chains_dynamic)
{
	cmd->lmac_id = cpu_to_le32(iwl_mvm_get_lmac_id(mvm,
						       chandef->chan->band));

	/* Set the channel info data */
	iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);

	/* we only support RLC command version 2 */
	if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP, RLC_CONFIG_CMD), 0) < 2)
		iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &cmd->rxchain_info,
					     chains_static, chains_dynamic);
}

int iwl_mvm_phy_send_rlc(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
			 u8 chains_static, u8 chains_dynamic)
{
	struct iwl_rlc_config_cmd cmd = {
		.phy_id = cpu_to_le32(ctxt->id),
	};

	if (ctxt->rlc_disabled)
		return 0;

	if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP,
						   RLC_CONFIG_CMD), 0) < 2)
		return 0;

	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_DRIVER_FORCE !=
		     PHY_RX_CHAIN_DRIVER_FORCE_MSK);
	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_VALID !=
		     PHY_RX_CHAIN_VALID_MSK);
	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_FORCE !=
		     PHY_RX_CHAIN_FORCE_SEL_MSK);
	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_FORCE_MIMO !=
		     PHY_RX_CHAIN_FORCE_MIMO_SEL_MSK);
	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_COUNT != PHY_RX_CHAIN_CNT_MSK);
	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_MIMO_COUNT !=
		     PHY_RX_CHAIN_MIMO_CNT_MSK);

	iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &cmd.rlc.rx_chain_info,
				     chains_static, chains_dynamic);

	IWL_DEBUG_FW(mvm, "Send RLC command: phy=%d, rx_chain_info=0x%x\n",
		     ctxt->id, cmd.rlc.rx_chain_info);

	return iwl_mvm_send_cmd_pdu(mvm, iwl_cmd_id(RLC_CONFIG_CMD,
						    DATA_PATH_GROUP, 2),
				    0, sizeof(cmd), &cmd);
}

/*
 * Send a command to apply the current phy configuration. The command is send
 * only if something in the configuration changed: in case that this is the
 * first time that the phy configuration is applied or in case that the phy
 * configuration changed from the previous apply.
 */
static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
				  struct iwl_mvm_phy_ctxt *ctxt,
				  struct cfg80211_chan_def *chandef,
				  u8 chains_static, u8 chains_dynamic,
				  u32 action)
{
	int ret;
	int ver = iwl_fw_lookup_cmd_ver(mvm->fw, PHY_CONTEXT_CMD, 1);

	if (ver == 3 || ver == 4) {
		struct iwl_phy_context_cmd cmd = {};

		/* Set the command header fields */
		iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action);

		/* Set the command data */
		iwl_mvm_phy_ctxt_cmd_data(mvm, ctxt, &cmd, chandef,
					  chains_static,
					  chains_dynamic);

		ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD,
					   0, sizeof(cmd), &cmd);
	} else if (ver < 3) {
		struct iwl_phy_context_cmd_v1 cmd = {};
		u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm);

		/* Set the command header fields */
		iwl_mvm_phy_ctxt_cmd_hdr(ctxt,
					 (struct iwl_phy_context_cmd *)&cmd,
					 action);

		/* Set the command data */
		iwl_mvm_phy_ctxt_cmd_data_v1(mvm, ctxt, &cmd, chandef,
					     chains_static,
					     chains_dynamic);
		ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD,
					   0, len, &cmd);
	} else {
		IWL_ERR(mvm, "PHY ctxt cmd error ver %d not supported\n", ver);
		return -EOPNOTSUPP;
	}


	if (ret) {
		IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
		return ret;
	}

	if (action != FW_CTXT_ACTION_REMOVE)
		return iwl_mvm_phy_send_rlc(mvm, ctxt, chains_static,
					    chains_dynamic);

	return 0;
}

/*
 * Send a command to add a PHY context based on the current HW configuration.
 */
int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
			 struct cfg80211_chan_def *chandef,
			 u8 chains_static, u8 chains_dynamic)
{
	int ret;

	WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
		ctxt->ref);
	lockdep_assert_held(&mvm->mutex);

	ctxt->channel = chandef->chan;
	ctxt->width = chandef->width;
	ctxt->center_freq1 = chandef->center_freq1;

	ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
				     chains_static, chains_dynamic,
				     FW_CTXT_ACTION_ADD);

	if (ret)
		return ret;

	ctxt->ref++;

	return 0;
}

/*
 * Update the number of references to the given PHY context. This is valid only
 * in case the PHY context was already created, i.e., its reference count > 0.
 */
void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
{
	lockdep_assert_held(&mvm->mutex);

	/* If we were taking the first ref, we should have
	 * called iwl_mvm_phy_ctxt_add.
	 */
	WARN_ON(!ctxt->ref);
	ctxt->ref++;
}

/*
 * Send a command to modify the PHY context based on the current HW
 * configuration. Note that the function does not check that the configuration
 * changed.
 */
int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
			     struct cfg80211_chan_def *chandef,
			     u8 chains_static, u8 chains_dynamic)
{
	enum iwl_ctxt_action action = FW_CTXT_ACTION_MODIFY;

	lockdep_assert_held(&mvm->mutex);

	if (WARN_ON_ONCE(!ctxt->ref))
		return -EINVAL;

	if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP,
						   RLC_CONFIG_CMD), 0) >= 2 &&
	    ctxt->channel == chandef->chan &&
	    ctxt->width == chandef->width &&
	    ctxt->center_freq1 == chandef->center_freq1)
		return iwl_mvm_phy_send_rlc(mvm, ctxt, chains_static,
					    chains_dynamic);

	if (fw_has_capa(&mvm->fw->ucode_capa,
			IWL_UCODE_TLV_CAPA_BINDING_CDB_SUPPORT) &&
	    ctxt->channel->band != chandef->chan->band) {
		int ret;

		/* ... remove it here ...*/
		ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
					     chains_static, chains_dynamic,
					     FW_CTXT_ACTION_REMOVE);
		if (ret)
			return ret;

		/* ... and proceed to add it again */
		action = FW_CTXT_ACTION_ADD;
	}

	ctxt->channel = chandef->chan;
	ctxt->width = chandef->width;
	ctxt->center_freq1 = chandef->center_freq1;

	return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
				      chains_static, chains_dynamic,
				      action);
}

void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
{
	struct cfg80211_chan_def chandef;
	lockdep_assert_held(&mvm->mutex);

	if (WARN_ON_ONCE(!ctxt))
		return;

	ctxt->ref--;

	if (ctxt->ref)
		return;

	cfg80211_chandef_create(&chandef, ctxt->channel, NL80211_CHAN_NO_HT);

	iwl_mvm_phy_ctxt_apply(mvm, ctxt, &chandef, 1, 1,
			       FW_CTXT_ACTION_REMOVE);
}

static void iwl_mvm_binding_iterator(void *_data, u8 *mac,
				     struct ieee80211_vif *vif)
{
	unsigned long *data = _data;
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

	if (!mvmvif->deflink.phy_ctxt)
		return;

	if (vif->type == NL80211_IFTYPE_STATION ||
	    vif->type == NL80211_IFTYPE_AP)
		__set_bit(mvmvif->deflink.phy_ctxt->id, data);
}

int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm)
{
	unsigned long phy_ctxt_counter = 0;

	ieee80211_iterate_active_interfaces_atomic(mvm->hw,
						   IEEE80211_IFACE_ITER_NORMAL,
						   iwl_mvm_binding_iterator,
						   &phy_ctxt_counter);

	return hweight8(phy_ctxt_counter);
}