1 /******************************************************************************
2  *
3  * This file is provided under a dual BSD/GPLv2 license.  When using or
4  * redistributing this file, you may do so under either license.
5  *
6  * GPL LICENSE SUMMARY
7  *
8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
9  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
10  * Copyright(c) 2017           Intel Deutschland GmbH
11  * Copyright(c) 2018           Intel Corporation
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of version 2 of the GNU General Public License as
15  * published by the Free Software Foundation.
16  *
17  * This program is distributed in the hope that it will be useful, but
18  * WITHOUT ANY WARRANTY; without even the implied warranty of
19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
20  * General Public License for more details.
21  *
22  * The full GNU General Public License is included in this distribution
23  * in the file called COPYING.
24  *
25  * Contact Information:
26  *  Intel Linux Wireless <linuxwifi@intel.com>
27  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
28  *
29  * BSD LICENSE
30  *
31  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
32  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
33  * Copyright(c) 2018           Intel Corporation
34  * All rights reserved.
35  *
36  * Redistribution and use in source and binary forms, with or without
37  * modification, are permitted provided that the following conditions
38  * are met:
39  *
40  *  * Redistributions of source code must retain the above copyright
41  *    notice, this list of conditions and the following disclaimer.
42  *  * Redistributions in binary form must reproduce the above copyright
43  *    notice, this list of conditions and the following disclaimer in
44  *    the documentation and/or other materials provided with the
45  *    distribution.
46  *  * Neither the name Intel Corporation nor the names of its
47  *    contributors may be used to endorse or promote products derived
48  *    from this software without specific prior written permission.
49  *
50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61  *
62  *****************************************************************************/
63 
64 #include <net/mac80211.h>
65 #include "fw-api.h"
66 #include "mvm.h"
67 
68 /* Maps the driver specific channel width definition to the fw values */
69 u8 iwl_mvm_get_channel_width(struct cfg80211_chan_def *chandef)
70 {
71 	switch (chandef->width) {
72 	case NL80211_CHAN_WIDTH_20_NOHT:
73 	case NL80211_CHAN_WIDTH_20:
74 		return PHY_VHT_CHANNEL_MODE20;
75 	case NL80211_CHAN_WIDTH_40:
76 		return PHY_VHT_CHANNEL_MODE40;
77 	case NL80211_CHAN_WIDTH_80:
78 		return PHY_VHT_CHANNEL_MODE80;
79 	case NL80211_CHAN_WIDTH_160:
80 		return PHY_VHT_CHANNEL_MODE160;
81 	default:
82 		WARN(1, "Invalid channel width=%u", chandef->width);
83 		return PHY_VHT_CHANNEL_MODE20;
84 	}
85 }
86 
87 /*
88  * Maps the driver specific control channel position (relative to the center
89  * freq) definitions to the the fw values
90  */
91 u8 iwl_mvm_get_ctrl_pos(struct cfg80211_chan_def *chandef)
92 {
93 	switch (chandef->chan->center_freq - chandef->center_freq1) {
94 	case -70:
95 		return PHY_VHT_CTRL_POS_4_BELOW;
96 	case -50:
97 		return PHY_VHT_CTRL_POS_3_BELOW;
98 	case -30:
99 		return PHY_VHT_CTRL_POS_2_BELOW;
100 	case -10:
101 		return PHY_VHT_CTRL_POS_1_BELOW;
102 	case  10:
103 		return PHY_VHT_CTRL_POS_1_ABOVE;
104 	case  30:
105 		return PHY_VHT_CTRL_POS_2_ABOVE;
106 	case  50:
107 		return PHY_VHT_CTRL_POS_3_ABOVE;
108 	case  70:
109 		return PHY_VHT_CTRL_POS_4_ABOVE;
110 	default:
111 		WARN(1, "Invalid channel definition");
112 		/* fall through */
113 	case 0:
114 		/*
115 		 * The FW is expected to check the control channel position only
116 		 * when in HT/VHT and the channel width is not 20MHz. Return
117 		 * this value as the default one.
118 		 */
119 		return PHY_VHT_CTRL_POS_1_BELOW;
120 	}
121 }
122 
123 /*
124  * Construct the generic fields of the PHY context command
125  */
126 static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt,
127 				     struct iwl_phy_context_cmd *cmd,
128 				     u32 action, u32 apply_time)
129 {
130 	memset(cmd, 0, sizeof(struct iwl_phy_context_cmd));
131 
132 	cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id,
133 							    ctxt->color));
134 	cmd->action = cpu_to_le32(action);
135 	cmd->apply_time = cpu_to_le32(apply_time);
136 }
137 
138 /*
139  * Add the phy configuration to the PHY context command
140  */
141 static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm,
142 				      struct iwl_phy_context_cmd *cmd,
143 				      struct cfg80211_chan_def *chandef,
144 				      u8 chains_static, u8 chains_dynamic)
145 {
146 	u8 active_cnt, idle_cnt;
147 	struct iwl_phy_context_cmd_tail *tail =
148 		iwl_mvm_chan_info_cmd_tail(mvm, &cmd->ci);
149 
150 	/* Set the channel info data */
151 	iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);
152 
153 	/* Set rx the chains */
154 	idle_cnt = chains_static;
155 	active_cnt = chains_dynamic;
156 
157 	/* In scenarios where we only ever use a single-stream rates,
158 	 * i.e. legacy 11b/g/a associations, single-stream APs or even
159 	 * static SMPS, enable both chains to get diversity, improving
160 	 * the case where we're far enough from the AP that attenuation
161 	 * between the two antennas is sufficiently different to impact
162 	 * performance.
163 	 */
164 	if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm)) {
165 		idle_cnt = 2;
166 		active_cnt = 2;
167 	}
168 
169 	tail->rxchain_info = cpu_to_le32(iwl_mvm_get_valid_rx_ant(mvm) <<
170 					PHY_RX_CHAIN_VALID_POS);
171 	tail->rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
172 	tail->rxchain_info |= cpu_to_le32(active_cnt <<
173 					 PHY_RX_CHAIN_MIMO_CNT_POS);
174 #ifdef CONFIG_IWLWIFI_DEBUGFS
175 	if (unlikely(mvm->dbgfs_rx_phyinfo))
176 		tail->rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo);
177 #endif
178 
179 	tail->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
180 }
181 
182 /*
183  * Send a command to apply the current phy configuration. The command is send
184  * only if something in the configuration changed: in case that this is the
185  * first time that the phy configuration is applied or in case that the phy
186  * configuration changed from the previous apply.
187  */
188 static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
189 				  struct iwl_mvm_phy_ctxt *ctxt,
190 				  struct cfg80211_chan_def *chandef,
191 				  u8 chains_static, u8 chains_dynamic,
192 				  u32 action, u32 apply_time)
193 {
194 	struct iwl_phy_context_cmd cmd;
195 	int ret;
196 	u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm);
197 
198 	/* Set the command header fields */
199 	iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action, apply_time);
200 
201 	/* Set the command data */
202 	iwl_mvm_phy_ctxt_cmd_data(mvm, &cmd, chandef,
203 				  chains_static, chains_dynamic);
204 
205 	ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD, 0, len, &cmd);
206 	if (ret)
207 		IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
208 	return ret;
209 }
210 
211 /*
212  * Send a command to add a PHY context based on the current HW configuration.
213  */
214 int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
215 			 struct cfg80211_chan_def *chandef,
216 			 u8 chains_static, u8 chains_dynamic)
217 {
218 	WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
219 		ctxt->ref);
220 	lockdep_assert_held(&mvm->mutex);
221 
222 	ctxt->channel = chandef->chan;
223 
224 	return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
225 				      chains_static, chains_dynamic,
226 				      FW_CTXT_ACTION_ADD, 0);
227 }
228 
229 /*
230  * Update the number of references to the given PHY context. This is valid only
231  * in case the PHY context was already created, i.e., its reference count > 0.
232  */
233 void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
234 {
235 	lockdep_assert_held(&mvm->mutex);
236 	ctxt->ref++;
237 }
238 
239 /*
240  * Send a command to modify the PHY context based on the current HW
241  * configuration. Note that the function does not check that the configuration
242  * changed.
243  */
244 int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
245 			     struct cfg80211_chan_def *chandef,
246 			     u8 chains_static, u8 chains_dynamic)
247 {
248 	enum iwl_ctxt_action action = FW_CTXT_ACTION_MODIFY;
249 
250 	lockdep_assert_held(&mvm->mutex);
251 
252 	if (fw_has_capa(&mvm->fw->ucode_capa,
253 			IWL_UCODE_TLV_CAPA_BINDING_CDB_SUPPORT) &&
254 	    ctxt->channel->band != chandef->chan->band) {
255 		int ret;
256 
257 		/* ... remove it here ...*/
258 		ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
259 					     chains_static, chains_dynamic,
260 					     FW_CTXT_ACTION_REMOVE, 0);
261 		if (ret)
262 			return ret;
263 
264 		/* ... and proceed to add it again */
265 		action = FW_CTXT_ACTION_ADD;
266 	}
267 
268 	ctxt->channel = chandef->chan;
269 	ctxt->width = chandef->width;
270 	return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
271 				      chains_static, chains_dynamic,
272 				      action, 0);
273 }
274 
275 void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
276 {
277 	lockdep_assert_held(&mvm->mutex);
278 
279 	if (WARN_ON_ONCE(!ctxt))
280 		return;
281 
282 	ctxt->ref--;
283 
284 	/*
285 	 * Move unused phy's to a default channel. When the phy is moved the,
286 	 * fw will cleanup immediate quiet bit if it was previously set,
287 	 * otherwise we might not be able to reuse this phy.
288 	 */
289 	if (ctxt->ref == 0) {
290 		struct ieee80211_channel *chan;
291 		struct cfg80211_chan_def chandef;
292 		struct ieee80211_supported_band *sband = NULL;
293 		enum nl80211_band band = NL80211_BAND_2GHZ;
294 
295 		while (!sband && band < NUM_NL80211_BANDS)
296 			sband = mvm->hw->wiphy->bands[band++];
297 
298 		if (WARN_ON(!sband))
299 			return;
300 
301 		chan = &sband->channels[0];
302 
303 		cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
304 		iwl_mvm_phy_ctxt_changed(mvm, ctxt, &chandef, 1, 1);
305 	}
306 }
307 
308 static void iwl_mvm_binding_iterator(void *_data, u8 *mac,
309 				     struct ieee80211_vif *vif)
310 {
311 	unsigned long *data = _data;
312 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
313 
314 	if (!mvmvif->phy_ctxt)
315 		return;
316 
317 	if (vif->type == NL80211_IFTYPE_STATION ||
318 	    vif->type == NL80211_IFTYPE_AP)
319 		__set_bit(mvmvif->phy_ctxt->id, data);
320 }
321 
322 int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm)
323 {
324 	unsigned long phy_ctxt_counter = 0;
325 
326 	ieee80211_iterate_active_interfaces_atomic(mvm->hw,
327 						   IEEE80211_IFACE_ITER_NORMAL,
328 						   iwl_mvm_binding_iterator,
329 						   &phy_ctxt_counter);
330 
331 	return hweight8(phy_ctxt_counter);
332 }
333