xref: /linux/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c (revision 4b660dbd9ee2059850fd30e0df420ca7a38a1856)
1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3  * Copyright (C) 2012-2014, 2018-2024 Intel Corporation
4  * Copyright (C) 2013-2014 Intel Mobile Communications GmbH
5  * Copyright (C) 2017 Intel Deutschland GmbH
6  */
7 #include <net/mac80211.h>
8 #include "fw-api.h"
9 #include "mvm.h"
10 
11 /* Maps the driver specific channel width definition to the fw values */
12 u8 iwl_mvm_get_channel_width(const struct cfg80211_chan_def *chandef)
13 {
14 	switch (chandef->width) {
15 	case NL80211_CHAN_WIDTH_20_NOHT:
16 	case NL80211_CHAN_WIDTH_20:
17 		return IWL_PHY_CHANNEL_MODE20;
18 	case NL80211_CHAN_WIDTH_40:
19 		return IWL_PHY_CHANNEL_MODE40;
20 	case NL80211_CHAN_WIDTH_80:
21 		return IWL_PHY_CHANNEL_MODE80;
22 	case NL80211_CHAN_WIDTH_160:
23 		return IWL_PHY_CHANNEL_MODE160;
24 	case NL80211_CHAN_WIDTH_320:
25 		return IWL_PHY_CHANNEL_MODE320;
26 	default:
27 		WARN(1, "Invalid channel width=%u", chandef->width);
28 		return IWL_PHY_CHANNEL_MODE20;
29 	}
30 }
31 
32 /*
33  * Maps the driver specific control channel position (relative to the center
34  * freq) definitions to the the fw values
35  */
36 u8 iwl_mvm_get_ctrl_pos(const struct cfg80211_chan_def *chandef)
37 {
38 	int offs = chandef->chan->center_freq - chandef->center_freq1;
39 	int abs_offs = abs(offs);
40 	u8 ret;
41 
42 	if (offs == 0) {
43 		/*
44 		 * The FW is expected to check the control channel position only
45 		 * when in HT/VHT and the channel width is not 20MHz. Return
46 		 * this value as the default one.
47 		 */
48 		return 0;
49 	}
50 
51 	/* this results in a value 0-7, i.e. fitting into 0b0111 */
52 	ret = (abs_offs - 10) / 20;
53 	/*
54 	 * But we need the value to be in 0b1011 because 0b0100 is
55 	 * IWL_PHY_CTRL_POS_ABOVE, so shift bit 2 up to land in
56 	 * IWL_PHY_CTRL_POS_OFFS_EXT (0b1000)
57 	 */
58 	ret = (ret & IWL_PHY_CTRL_POS_OFFS_MSK) |
59 	      ((ret & BIT(2)) << 1);
60 	/* and add the above bit */
61 	ret |= (offs > 0) * IWL_PHY_CTRL_POS_ABOVE;
62 
63 	return ret;
64 }
65 
66 /*
67  * Construct the generic fields of the PHY context command
68  */
69 static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt,
70 				     struct iwl_phy_context_cmd *cmd,
71 				     u32 action)
72 {
73 	cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id,
74 							    ctxt->color));
75 	cmd->action = cpu_to_le32(action);
76 }
77 
78 static void iwl_mvm_phy_ctxt_set_rxchain(struct iwl_mvm *mvm,
79 					 struct iwl_mvm_phy_ctxt *ctxt,
80 					 __le32 *rxchain_info,
81 					 u8 chains_static,
82 					 u8 chains_dynamic)
83 {
84 	u8 active_cnt, idle_cnt;
85 
86 	/* Set rx the chains */
87 	idle_cnt = chains_static;
88 	active_cnt = chains_dynamic;
89 
90 	/* In scenarios where we only ever use a single-stream rates,
91 	 * i.e. legacy 11b/g/a associations, single-stream APs or even
92 	 * static SMPS, enable both chains to get diversity, improving
93 	 * the case where we're far enough from the AP that attenuation
94 	 * between the two antennas is sufficiently different to impact
95 	 * performance.
96 	 */
97 	if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm, ctxt)) {
98 		idle_cnt = 2;
99 		active_cnt = 2;
100 	}
101 
102 	*rxchain_info = cpu_to_le32(iwl_mvm_get_valid_rx_ant(mvm) <<
103 					PHY_RX_CHAIN_VALID_POS);
104 	*rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
105 	*rxchain_info |= cpu_to_le32(active_cnt <<
106 					 PHY_RX_CHAIN_MIMO_CNT_POS);
107 #ifdef CONFIG_IWLWIFI_DEBUGFS
108 	if (unlikely(mvm->dbgfs_rx_phyinfo))
109 		*rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo);
110 #endif
111 }
112 
113 /*
114  * Add the phy configuration to the PHY context command
115  */
116 static void iwl_mvm_phy_ctxt_cmd_data_v1(struct iwl_mvm *mvm,
117 					 struct iwl_mvm_phy_ctxt *ctxt,
118 					 struct iwl_phy_context_cmd_v1 *cmd,
119 					 const struct cfg80211_chan_def *chandef,
120 					 u8 chains_static, u8 chains_dynamic)
121 {
122 	struct iwl_phy_context_cmd_tail *tail =
123 		iwl_mvm_chan_info_cmd_tail(mvm, &cmd->ci);
124 
125 	/* Set the channel info data */
126 	iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);
127 
128 	iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &tail->rxchain_info,
129 				     chains_static, chains_dynamic);
130 
131 	tail->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
132 }
133 
134 /*
135  * Add the phy configuration to the PHY context command
136  */
137 static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm,
138 				      struct iwl_mvm_phy_ctxt *ctxt,
139 				      struct iwl_phy_context_cmd *cmd,
140 				      const struct cfg80211_chan_def *chandef,
141 				      u8 chains_static, u8 chains_dynamic)
142 {
143 	cmd->lmac_id = cpu_to_le32(iwl_mvm_get_lmac_id(mvm,
144 						       chandef->chan->band));
145 
146 	/* Set the channel info data */
147 	iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);
148 
149 	/* we only support RLC command version 2 */
150 	if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP, RLC_CONFIG_CMD), 0) < 2)
151 		iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &cmd->rxchain_info,
152 					     chains_static, chains_dynamic);
153 }
154 
155 int iwl_mvm_phy_send_rlc(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
156 			 u8 chains_static, u8 chains_dynamic)
157 {
158 	struct iwl_rlc_config_cmd cmd = {
159 		.phy_id = cpu_to_le32(ctxt->id),
160 	};
161 
162 	if (ctxt->rlc_disabled)
163 		return 0;
164 
165 	if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP,
166 						   RLC_CONFIG_CMD), 0) < 2)
167 		return 0;
168 
169 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_DRIVER_FORCE !=
170 		     PHY_RX_CHAIN_DRIVER_FORCE_MSK);
171 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_VALID !=
172 		     PHY_RX_CHAIN_VALID_MSK);
173 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_FORCE !=
174 		     PHY_RX_CHAIN_FORCE_SEL_MSK);
175 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_FORCE_MIMO !=
176 		     PHY_RX_CHAIN_FORCE_MIMO_SEL_MSK);
177 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_COUNT != PHY_RX_CHAIN_CNT_MSK);
178 	BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_MIMO_COUNT !=
179 		     PHY_RX_CHAIN_MIMO_CNT_MSK);
180 
181 	iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &cmd.rlc.rx_chain_info,
182 				     chains_static, chains_dynamic);
183 
184 	IWL_DEBUG_FW(mvm, "Send RLC command: phy=%d, rx_chain_info=0x%x\n",
185 		     ctxt->id, cmd.rlc.rx_chain_info);
186 
187 	return iwl_mvm_send_cmd_pdu(mvm, iwl_cmd_id(RLC_CONFIG_CMD,
188 						    DATA_PATH_GROUP, 2),
189 				    0, sizeof(cmd), &cmd);
190 }
191 
192 /*
193  * Send a command to apply the current phy configuration. The command is send
194  * only if something in the configuration changed: in case that this is the
195  * first time that the phy configuration is applied or in case that the phy
196  * configuration changed from the previous apply.
197  */
198 static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
199 				  struct iwl_mvm_phy_ctxt *ctxt,
200 				  const struct cfg80211_chan_def *chandef,
201 				  const struct cfg80211_chan_def *ap,
202 				  u8 chains_static, u8 chains_dynamic,
203 				  u32 action)
204 {
205 	int ret;
206 	int ver = iwl_fw_lookup_cmd_ver(mvm->fw, PHY_CONTEXT_CMD, 1);
207 
208 	if (ver < 5 || !ap || !ap->chan)
209 		ap = NULL;
210 
211 	if (ver >= 3 && ver <= 6) {
212 		struct iwl_phy_context_cmd cmd = {};
213 
214 		/* Set the command header fields */
215 		iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action);
216 
217 		/* Set the command data */
218 		iwl_mvm_phy_ctxt_cmd_data(mvm, ctxt, &cmd, chandef,
219 					  chains_static,
220 					  chains_dynamic);
221 
222 		if (ap) {
223 			cmd.sbb_bandwidth = iwl_mvm_get_channel_width(ap);
224 			cmd.sbb_ctrl_channel_loc = iwl_mvm_get_ctrl_pos(ap);
225 		}
226 
227 		if (ver == 6)
228 			cmd.puncture_mask = cpu_to_le16(chandef->punctured);
229 
230 		ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD,
231 					   0, sizeof(cmd), &cmd);
232 	} else if (ver < 3) {
233 		struct iwl_phy_context_cmd_v1 cmd = {};
234 		u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm);
235 
236 		/* Set the command header fields */
237 		iwl_mvm_phy_ctxt_cmd_hdr(ctxt,
238 					 (struct iwl_phy_context_cmd *)&cmd,
239 					 action);
240 
241 		/* Set the command data */
242 		iwl_mvm_phy_ctxt_cmd_data_v1(mvm, ctxt, &cmd, chandef,
243 					     chains_static,
244 					     chains_dynamic);
245 		ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD,
246 					   0, len, &cmd);
247 	} else {
248 		IWL_ERR(mvm, "PHY ctxt cmd error ver %d not supported\n", ver);
249 		return -EOPNOTSUPP;
250 	}
251 
252 
253 	if (ret) {
254 		IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
255 		return ret;
256 	}
257 
258 	if (action != FW_CTXT_ACTION_REMOVE)
259 		return iwl_mvm_phy_send_rlc(mvm, ctxt, chains_static,
260 					    chains_dynamic);
261 
262 	return 0;
263 }
264 
265 /*
266  * Send a command to add a PHY context based on the current HW configuration.
267  */
268 int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
269 			 const struct cfg80211_chan_def *chandef,
270 			 const struct cfg80211_chan_def *ap,
271 			 u8 chains_static, u8 chains_dynamic)
272 {
273 	int ret;
274 
275 	WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
276 		ctxt->ref);
277 	lockdep_assert_held(&mvm->mutex);
278 
279 	ctxt->channel = chandef->chan;
280 	ctxt->width = chandef->width;
281 	ctxt->center_freq1 = chandef->center_freq1;
282 
283 	ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef, ap,
284 				     chains_static, chains_dynamic,
285 				     FW_CTXT_ACTION_ADD);
286 
287 	if (ret)
288 		return ret;
289 
290 	ctxt->ref++;
291 
292 	return 0;
293 }
294 
295 /*
296  * Update the number of references to the given PHY context. This is valid only
297  * in case the PHY context was already created, i.e., its reference count > 0.
298  */
299 void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
300 {
301 	lockdep_assert_held(&mvm->mutex);
302 
303 	/* If we were taking the first ref, we should have
304 	 * called iwl_mvm_phy_ctxt_add.
305 	 */
306 	WARN_ON(!ctxt->ref);
307 	ctxt->ref++;
308 }
309 
310 /*
311  * Send a command to modify the PHY context based on the current HW
312  * configuration. Note that the function does not check that the configuration
313  * changed.
314  */
315 int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
316 			     const struct cfg80211_chan_def *chandef,
317 			     const struct cfg80211_chan_def *ap,
318 			     u8 chains_static, u8 chains_dynamic)
319 {
320 	enum iwl_ctxt_action action = FW_CTXT_ACTION_MODIFY;
321 
322 	lockdep_assert_held(&mvm->mutex);
323 
324 	if (WARN_ON_ONCE(!ctxt->ref))
325 		return -EINVAL;
326 
327 	if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP,
328 						   RLC_CONFIG_CMD), 0) >= 2 &&
329 	    ctxt->channel == chandef->chan &&
330 	    ctxt->width == chandef->width &&
331 	    ctxt->center_freq1 == chandef->center_freq1)
332 		return iwl_mvm_phy_send_rlc(mvm, ctxt, chains_static,
333 					    chains_dynamic);
334 
335 	if (fw_has_capa(&mvm->fw->ucode_capa,
336 			IWL_UCODE_TLV_CAPA_BINDING_CDB_SUPPORT) &&
337 	    ctxt->channel->band != chandef->chan->band) {
338 		int ret;
339 
340 		/* ... remove it here ...*/
341 		ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef, NULL,
342 					     chains_static, chains_dynamic,
343 					     FW_CTXT_ACTION_REMOVE);
344 		if (ret)
345 			return ret;
346 
347 		/* ... and proceed to add it again */
348 		action = FW_CTXT_ACTION_ADD;
349 	}
350 
351 	ctxt->channel = chandef->chan;
352 	ctxt->width = chandef->width;
353 	ctxt->center_freq1 = chandef->center_freq1;
354 
355 	return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef, ap,
356 				      chains_static, chains_dynamic,
357 				      action);
358 }
359 
360 void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
361 {
362 	struct cfg80211_chan_def chandef;
363 	lockdep_assert_held(&mvm->mutex);
364 
365 	if (WARN_ON_ONCE(!ctxt))
366 		return;
367 
368 	ctxt->ref--;
369 
370 	if (ctxt->ref)
371 		return;
372 
373 	cfg80211_chandef_create(&chandef, ctxt->channel, NL80211_CHAN_NO_HT);
374 
375 	iwl_mvm_phy_ctxt_apply(mvm, ctxt, &chandef, NULL, 1, 1,
376 			       FW_CTXT_ACTION_REMOVE);
377 }
378 
379 static void iwl_mvm_binding_iterator(void *_data, u8 *mac,
380 				     struct ieee80211_vif *vif)
381 {
382 	unsigned long *data = _data;
383 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
384 
385 	if (!mvmvif->deflink.phy_ctxt)
386 		return;
387 
388 	if (vif->type == NL80211_IFTYPE_STATION ||
389 	    vif->type == NL80211_IFTYPE_AP)
390 		__set_bit(mvmvif->deflink.phy_ctxt->id, data);
391 }
392 
393 int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm)
394 {
395 	unsigned long phy_ctxt_counter = 0;
396 
397 	ieee80211_iterate_active_interfaces_atomic(mvm->hw,
398 						   IEEE80211_IFACE_ITER_NORMAL,
399 						   iwl_mvm_binding_iterator,
400 						   &phy_ctxt_counter);
401 
402 	return hweight8(phy_ctxt_counter);
403 }
404