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1053d35f RR |
1 | /****************************************************************************** |
2 | * | |
51368bf7 | 3 | * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved. |
1053d35f RR |
4 | * |
5 | * Portions of this file are derived from the ipw3945 project, as well | |
6 | * as portions of the ieee80211 subsystem header files. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of version 2 of the GNU General Public License as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | * more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along with | |
18 | * this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA | |
20 | * | |
21 | * The full GNU General Public License is included in this distribution in the | |
22 | * file called LICENSE. | |
23 | * | |
24 | * Contact Information: | |
759ef89f | 25 | * Intel Linux Wireless <ilw@linux.intel.com> |
1053d35f RR |
26 | * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 |
27 | * | |
28 | *****************************************************************************/ | |
fd4abac5 | 29 | #include <linux/etherdevice.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
253a634c | 31 | #include <linux/sched.h> |
253a634c | 32 | |
522376d2 EG |
33 | #include "iwl-debug.h" |
34 | #include "iwl-csr.h" | |
35 | #include "iwl-prph.h" | |
1053d35f | 36 | #include "iwl-io.h" |
680073b7 | 37 | #include "iwl-scd.h" |
ed277c93 | 38 | #include "iwl-op-mode.h" |
6468a01a | 39 | #include "internal.h" |
6238b008 | 40 | /* FIXME: need to abstract out TX command (once we know what it looks like) */ |
1023fdc4 | 41 | #include "dvm/commands.h" |
1053d35f | 42 | |
522376d2 EG |
43 | #define IWL_TX_CRC_SIZE 4 |
44 | #define IWL_TX_DELIMITER_SIZE 4 | |
45 | ||
f02831be EG |
46 | /*************** DMA-QUEUE-GENERAL-FUNCTIONS ***** |
47 | * DMA services | |
48 | * | |
49 | * Theory of operation | |
50 | * | |
51 | * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer | |
52 | * of buffer descriptors, each of which points to one or more data buffers for | |
53 | * the device to read from or fill. Driver and device exchange status of each | |
54 | * queue via "read" and "write" pointers. Driver keeps minimum of 2 empty | |
55 | * entries in each circular buffer, to protect against confusing empty and full | |
56 | * queue states. | |
57 | * | |
58 | * The device reads or writes the data in the queues via the device's several | |
59 | * DMA/FIFO channels. Each queue is mapped to a single DMA channel. | |
60 | * | |
61 | * For Tx queue, there are low mark and high mark limits. If, after queuing | |
62 | * the packet for Tx, free space become < low mark, Tx queue stopped. When | |
63 | * reclaiming packets (on 'tx done IRQ), if free space become > high mark, | |
64 | * Tx queue resumed. | |
65 | * | |
66 | ***************************************************/ | |
67 | static int iwl_queue_space(const struct iwl_queue *q) | |
68 | { | |
a9b29246 IY |
69 | unsigned int max; |
70 | unsigned int used; | |
f02831be | 71 | |
a9b29246 IY |
72 | /* |
73 | * To avoid ambiguity between empty and completely full queues, there | |
83f32a4b JB |
74 | * should always be less than TFD_QUEUE_SIZE_MAX elements in the queue. |
75 | * If q->n_window is smaller than TFD_QUEUE_SIZE_MAX, there is no need | |
76 | * to reserve any queue entries for this purpose. | |
a9b29246 | 77 | */ |
83f32a4b | 78 | if (q->n_window < TFD_QUEUE_SIZE_MAX) |
a9b29246 IY |
79 | max = q->n_window; |
80 | else | |
83f32a4b | 81 | max = TFD_QUEUE_SIZE_MAX - 1; |
f02831be | 82 | |
a9b29246 | 83 | /* |
83f32a4b JB |
84 | * TFD_QUEUE_SIZE_MAX is a power of 2, so the following is equivalent to |
85 | * modulo by TFD_QUEUE_SIZE_MAX and is well defined. | |
a9b29246 | 86 | */ |
83f32a4b | 87 | used = (q->write_ptr - q->read_ptr) & (TFD_QUEUE_SIZE_MAX - 1); |
a9b29246 IY |
88 | |
89 | if (WARN_ON(used > max)) | |
90 | return 0; | |
91 | ||
92 | return max - used; | |
f02831be EG |
93 | } |
94 | ||
95 | /* | |
96 | * iwl_queue_init - Initialize queue's high/low-water and read/write indexes | |
97 | */ | |
83f32a4b | 98 | static int iwl_queue_init(struct iwl_queue *q, int slots_num, u32 id) |
f02831be | 99 | { |
f02831be EG |
100 | q->n_window = slots_num; |
101 | q->id = id; | |
102 | ||
f02831be EG |
103 | /* slots_num must be power-of-two size, otherwise |
104 | * get_cmd_index is broken. */ | |
105 | if (WARN_ON(!is_power_of_2(slots_num))) | |
106 | return -EINVAL; | |
107 | ||
108 | q->low_mark = q->n_window / 4; | |
109 | if (q->low_mark < 4) | |
110 | q->low_mark = 4; | |
111 | ||
112 | q->high_mark = q->n_window / 8; | |
113 | if (q->high_mark < 2) | |
114 | q->high_mark = 2; | |
115 | ||
116 | q->write_ptr = 0; | |
117 | q->read_ptr = 0; | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
f02831be EG |
122 | static int iwl_pcie_alloc_dma_ptr(struct iwl_trans *trans, |
123 | struct iwl_dma_ptr *ptr, size_t size) | |
124 | { | |
125 | if (WARN_ON(ptr->addr)) | |
126 | return -EINVAL; | |
127 | ||
128 | ptr->addr = dma_alloc_coherent(trans->dev, size, | |
129 | &ptr->dma, GFP_KERNEL); | |
130 | if (!ptr->addr) | |
131 | return -ENOMEM; | |
132 | ptr->size = size; | |
133 | return 0; | |
134 | } | |
135 | ||
136 | static void iwl_pcie_free_dma_ptr(struct iwl_trans *trans, | |
137 | struct iwl_dma_ptr *ptr) | |
138 | { | |
139 | if (unlikely(!ptr->addr)) | |
140 | return; | |
141 | ||
142 | dma_free_coherent(trans->dev, ptr->size, ptr->addr, ptr->dma); | |
143 | memset(ptr, 0, sizeof(*ptr)); | |
144 | } | |
145 | ||
146 | static void iwl_pcie_txq_stuck_timer(unsigned long data) | |
147 | { | |
148 | struct iwl_txq *txq = (void *)data; | |
149 | struct iwl_queue *q = &txq->q; | |
150 | struct iwl_trans_pcie *trans_pcie = txq->trans_pcie; | |
151 | struct iwl_trans *trans = iwl_trans_pcie_get_trans(trans_pcie); | |
152 | u32 scd_sram_addr = trans_pcie->scd_base_addr + | |
153 | SCD_TX_STTS_QUEUE_OFFSET(txq->q.id); | |
154 | u8 buf[16]; | |
155 | int i; | |
156 | ||
157 | spin_lock(&txq->lock); | |
158 | /* check if triggered erroneously */ | |
159 | if (txq->q.read_ptr == txq->q.write_ptr) { | |
160 | spin_unlock(&txq->lock); | |
161 | return; | |
162 | } | |
163 | spin_unlock(&txq->lock); | |
164 | ||
165 | IWL_ERR(trans, "Queue %d stuck for %u ms.\n", txq->q.id, | |
166 | jiffies_to_msecs(trans_pcie->wd_timeout)); | |
167 | IWL_ERR(trans, "Current SW read_ptr %d write_ptr %d\n", | |
168 | txq->q.read_ptr, txq->q.write_ptr); | |
169 | ||
4fd442db | 170 | iwl_trans_read_mem_bytes(trans, scd_sram_addr, buf, sizeof(buf)); |
f02831be EG |
171 | |
172 | iwl_print_hex_error(trans, buf, sizeof(buf)); | |
173 | ||
174 | for (i = 0; i < FH_TCSR_CHNL_NUM; i++) | |
175 | IWL_ERR(trans, "FH TRBs(%d) = 0x%08x\n", i, | |
176 | iwl_read_direct32(trans, FH_TX_TRB_REG(i))); | |
177 | ||
178 | for (i = 0; i < trans->cfg->base_params->num_of_queues; i++) { | |
179 | u32 status = iwl_read_prph(trans, SCD_QUEUE_STATUS_BITS(i)); | |
180 | u8 fifo = (status >> SCD_QUEUE_STTS_REG_POS_TXF) & 0x7; | |
181 | bool active = !!(status & BIT(SCD_QUEUE_STTS_REG_POS_ACTIVE)); | |
182 | u32 tbl_dw = | |
4fd442db EG |
183 | iwl_trans_read_mem32(trans, |
184 | trans_pcie->scd_base_addr + | |
185 | SCD_TRANS_TBL_OFFSET_QUEUE(i)); | |
f02831be EG |
186 | |
187 | if (i & 0x1) | |
188 | tbl_dw = (tbl_dw & 0xFFFF0000) >> 16; | |
189 | else | |
190 | tbl_dw = tbl_dw & 0x0000FFFF; | |
191 | ||
192 | IWL_ERR(trans, | |
193 | "Q %d is %sactive and mapped to fifo %d ra_tid 0x%04x [%d,%d]\n", | |
194 | i, active ? "" : "in", fifo, tbl_dw, | |
83f32a4b JB |
195 | iwl_read_prph(trans, SCD_QUEUE_RDPTR(i)) & |
196 | (TFD_QUEUE_SIZE_MAX - 1), | |
f02831be EG |
197 | iwl_read_prph(trans, SCD_QUEUE_WRPTR(i))); |
198 | } | |
199 | ||
200 | for (i = q->read_ptr; i != q->write_ptr; | |
83f32a4b | 201 | i = iwl_queue_inc_wrap(i)) |
f02831be | 202 | IWL_ERR(trans, "scratch %d = 0x%08x\n", i, |
38c0f334 | 203 | le32_to_cpu(txq->scratchbufs[i].scratch)); |
f02831be | 204 | |
4c9706dc | 205 | iwl_force_nmi(trans); |
f02831be EG |
206 | } |
207 | ||
990aa6d7 EG |
208 | /* |
209 | * iwl_pcie_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array | |
48d42c42 | 210 | */ |
f02831be EG |
211 | static void iwl_pcie_txq_update_byte_cnt_tbl(struct iwl_trans *trans, |
212 | struct iwl_txq *txq, u16 byte_cnt) | |
48d42c42 | 213 | { |
105183b1 | 214 | struct iwlagn_scd_bc_tbl *scd_bc_tbl; |
20d3b647 | 215 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
48d42c42 EG |
216 | int write_ptr = txq->q.write_ptr; |
217 | int txq_id = txq->q.id; | |
218 | u8 sec_ctl = 0; | |
219 | u8 sta_id = 0; | |
220 | u16 len = byte_cnt + IWL_TX_CRC_SIZE + IWL_TX_DELIMITER_SIZE; | |
221 | __le16 bc_ent; | |
132f98c2 | 222 | struct iwl_tx_cmd *tx_cmd = |
bf8440e6 | 223 | (void *) txq->entries[txq->q.write_ptr].cmd->payload; |
48d42c42 | 224 | |
105183b1 EG |
225 | scd_bc_tbl = trans_pcie->scd_bc_tbls.addr; |
226 | ||
48d42c42 EG |
227 | WARN_ON(len > 0xFFF || write_ptr >= TFD_QUEUE_SIZE_MAX); |
228 | ||
132f98c2 EG |
229 | sta_id = tx_cmd->sta_id; |
230 | sec_ctl = tx_cmd->sec_ctl; | |
48d42c42 EG |
231 | |
232 | switch (sec_ctl & TX_CMD_SEC_MSK) { | |
233 | case TX_CMD_SEC_CCM: | |
4325f6ca | 234 | len += IEEE80211_CCMP_MIC_LEN; |
48d42c42 EG |
235 | break; |
236 | case TX_CMD_SEC_TKIP: | |
4325f6ca | 237 | len += IEEE80211_TKIP_ICV_LEN; |
48d42c42 EG |
238 | break; |
239 | case TX_CMD_SEC_WEP: | |
4325f6ca | 240 | len += IEEE80211_WEP_IV_LEN + IEEE80211_WEP_ICV_LEN; |
48d42c42 EG |
241 | break; |
242 | } | |
243 | ||
046db346 EG |
244 | if (trans_pcie->bc_table_dword) |
245 | len = DIV_ROUND_UP(len, 4); | |
246 | ||
247 | bc_ent = cpu_to_le16(len | (sta_id << 12)); | |
48d42c42 EG |
248 | |
249 | scd_bc_tbl[txq_id].tfd_offset[write_ptr] = bc_ent; | |
250 | ||
251 | if (write_ptr < TFD_QUEUE_SIZE_BC_DUP) | |
252 | scd_bc_tbl[txq_id]. | |
253 | tfd_offset[TFD_QUEUE_SIZE_MAX + write_ptr] = bc_ent; | |
254 | } | |
255 | ||
f02831be EG |
256 | static void iwl_pcie_txq_inval_byte_cnt_tbl(struct iwl_trans *trans, |
257 | struct iwl_txq *txq) | |
258 | { | |
259 | struct iwl_trans_pcie *trans_pcie = | |
260 | IWL_TRANS_GET_PCIE_TRANS(trans); | |
261 | struct iwlagn_scd_bc_tbl *scd_bc_tbl = trans_pcie->scd_bc_tbls.addr; | |
262 | int txq_id = txq->q.id; | |
263 | int read_ptr = txq->q.read_ptr; | |
264 | u8 sta_id = 0; | |
265 | __le16 bc_ent; | |
266 | struct iwl_tx_cmd *tx_cmd = | |
267 | (void *)txq->entries[txq->q.read_ptr].cmd->payload; | |
268 | ||
269 | WARN_ON(read_ptr >= TFD_QUEUE_SIZE_MAX); | |
270 | ||
271 | if (txq_id != trans_pcie->cmd_queue) | |
272 | sta_id = tx_cmd->sta_id; | |
273 | ||
274 | bc_ent = cpu_to_le16(1 | (sta_id << 12)); | |
275 | scd_bc_tbl[txq_id].tfd_offset[read_ptr] = bc_ent; | |
276 | ||
277 | if (read_ptr < TFD_QUEUE_SIZE_BC_DUP) | |
278 | scd_bc_tbl[txq_id]. | |
279 | tfd_offset[TFD_QUEUE_SIZE_MAX + read_ptr] = bc_ent; | |
280 | } | |
281 | ||
990aa6d7 EG |
282 | /* |
283 | * iwl_pcie_txq_inc_wr_ptr - Send new write index to hardware | |
fd4abac5 | 284 | */ |
ea68f460 JB |
285 | static void iwl_pcie_txq_inc_wr_ptr(struct iwl_trans *trans, |
286 | struct iwl_txq *txq) | |
fd4abac5 | 287 | { |
23e76d1a | 288 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
fd4abac5 | 289 | u32 reg = 0; |
fd4abac5 TW |
290 | int txq_id = txq->q.id; |
291 | ||
ea68f460 | 292 | lockdep_assert_held(&txq->lock); |
fd4abac5 | 293 | |
5045388c EP |
294 | /* |
295 | * explicitly wake up the NIC if: | |
296 | * 1. shadow registers aren't enabled | |
297 | * 2. NIC is woken up for CMD regardless of shadow outside this function | |
298 | * 3. there is a chance that the NIC is asleep | |
299 | */ | |
300 | if (!trans->cfg->base_params->shadow_reg_enable && | |
301 | txq_id != trans_pcie->cmd_queue && | |
302 | test_bit(STATUS_TPOWER_PMI, &trans->status)) { | |
f81c1f48 | 303 | /* |
5045388c EP |
304 | * wake up nic if it's powered down ... |
305 | * uCode will wake up, and interrupt us again, so next | |
306 | * time we'll skip this part. | |
f81c1f48 | 307 | */ |
5045388c EP |
308 | reg = iwl_read32(trans, CSR_UCODE_DRV_GP1); |
309 | ||
310 | if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) { | |
311 | IWL_DEBUG_INFO(trans, "Tx queue %d requesting wakeup, GP1 = 0x%x\n", | |
312 | txq_id, reg); | |
313 | iwl_set_bit(trans, CSR_GP_CNTRL, | |
314 | CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); | |
ea68f460 | 315 | txq->need_update = true; |
5045388c EP |
316 | return; |
317 | } | |
f81c1f48 | 318 | } |
5045388c EP |
319 | |
320 | /* | |
321 | * if not in power-save mode, uCode will never sleep when we're | |
322 | * trying to tx (during RFKILL, we're not trying to tx). | |
323 | */ | |
324 | IWL_DEBUG_TX(trans, "Q:%d WR: 0x%x\n", txq_id, txq->q.write_ptr); | |
325 | iwl_write32(trans, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8)); | |
ea68f460 | 326 | } |
5045388c | 327 | |
ea68f460 JB |
328 | void iwl_pcie_txq_check_wrptrs(struct iwl_trans *trans) |
329 | { | |
330 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); | |
331 | int i; | |
332 | ||
333 | for (i = 0; i < trans->cfg->base_params->num_of_queues; i++) { | |
334 | struct iwl_txq *txq = &trans_pcie->txq[i]; | |
335 | ||
d090f878 | 336 | spin_lock_bh(&txq->lock); |
ea68f460 JB |
337 | if (trans_pcie->txq[i].need_update) { |
338 | iwl_pcie_txq_inc_wr_ptr(trans, txq); | |
339 | trans_pcie->txq[i].need_update = false; | |
340 | } | |
d090f878 | 341 | spin_unlock_bh(&txq->lock); |
ea68f460 | 342 | } |
fd4abac5 | 343 | } |
fd4abac5 | 344 | |
f02831be | 345 | static inline dma_addr_t iwl_pcie_tfd_tb_get_addr(struct iwl_tfd *tfd, u8 idx) |
214d14d4 JB |
346 | { |
347 | struct iwl_tfd_tb *tb = &tfd->tbs[idx]; | |
348 | ||
349 | dma_addr_t addr = get_unaligned_le32(&tb->lo); | |
350 | if (sizeof(dma_addr_t) > sizeof(u32)) | |
351 | addr |= | |
352 | ((dma_addr_t)(le16_to_cpu(tb->hi_n_len) & 0xF) << 16) << 16; | |
353 | ||
354 | return addr; | |
355 | } | |
356 | ||
f02831be EG |
357 | static inline void iwl_pcie_tfd_set_tb(struct iwl_tfd *tfd, u8 idx, |
358 | dma_addr_t addr, u16 len) | |
214d14d4 JB |
359 | { |
360 | struct iwl_tfd_tb *tb = &tfd->tbs[idx]; | |
361 | u16 hi_n_len = len << 4; | |
362 | ||
363 | put_unaligned_le32(addr, &tb->lo); | |
364 | if (sizeof(dma_addr_t) > sizeof(u32)) | |
365 | hi_n_len |= ((addr >> 16) >> 16) & 0xF; | |
366 | ||
367 | tb->hi_n_len = cpu_to_le16(hi_n_len); | |
368 | ||
369 | tfd->num_tbs = idx + 1; | |
370 | } | |
371 | ||
f02831be | 372 | static inline u8 iwl_pcie_tfd_get_num_tbs(struct iwl_tfd *tfd) |
214d14d4 JB |
373 | { |
374 | return tfd->num_tbs & 0x1f; | |
375 | } | |
376 | ||
f02831be | 377 | static void iwl_pcie_tfd_unmap(struct iwl_trans *trans, |
98891754 JB |
378 | struct iwl_cmd_meta *meta, |
379 | struct iwl_tfd *tfd) | |
214d14d4 | 380 | { |
214d14d4 JB |
381 | int i; |
382 | int num_tbs; | |
383 | ||
214d14d4 | 384 | /* Sanity check on number of chunks */ |
f02831be | 385 | num_tbs = iwl_pcie_tfd_get_num_tbs(tfd); |
214d14d4 JB |
386 | |
387 | if (num_tbs >= IWL_NUM_OF_TBS) { | |
6d8f6eeb | 388 | IWL_ERR(trans, "Too many chunks: %i\n", num_tbs); |
214d14d4 JB |
389 | /* @todo issue fatal error, it is quite serious situation */ |
390 | return; | |
391 | } | |
392 | ||
38c0f334 | 393 | /* first TB is never freed - it's the scratchbuf data */ |
214d14d4 | 394 | |
214d14d4 | 395 | for (i = 1; i < num_tbs; i++) |
f02831be | 396 | dma_unmap_single(trans->dev, iwl_pcie_tfd_tb_get_addr(tfd, i), |
98891754 JB |
397 | iwl_pcie_tfd_tb_get_len(tfd, i), |
398 | DMA_TO_DEVICE); | |
ebed633c EG |
399 | |
400 | tfd->num_tbs = 0; | |
4ce7cc2b JB |
401 | } |
402 | ||
990aa6d7 EG |
403 | /* |
404 | * iwl_pcie_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr] | |
6d8f6eeb | 405 | * @trans - transport private data |
4ce7cc2b | 406 | * @txq - tx queue |
ebed633c | 407 | * @dma_dir - the direction of the DMA mapping |
4ce7cc2b JB |
408 | * |
409 | * Does NOT advance any TFD circular buffer read/write indexes | |
410 | * Does NOT free the TFD itself (which is within circular buffer) | |
411 | */ | |
98891754 | 412 | static void iwl_pcie_txq_free_tfd(struct iwl_trans *trans, struct iwl_txq *txq) |
4ce7cc2b JB |
413 | { |
414 | struct iwl_tfd *tfd_tmp = txq->tfds; | |
4ce7cc2b | 415 | |
83f32a4b JB |
416 | /* rd_ptr is bounded by TFD_QUEUE_SIZE_MAX and |
417 | * idx is bounded by n_window | |
418 | */ | |
ebed633c EG |
419 | int rd_ptr = txq->q.read_ptr; |
420 | int idx = get_cmd_index(&txq->q, rd_ptr); | |
421 | ||
015c15e1 JB |
422 | lockdep_assert_held(&txq->lock); |
423 | ||
83f32a4b JB |
424 | /* We have only q->n_window txq->entries, but we use |
425 | * TFD_QUEUE_SIZE_MAX tfds | |
426 | */ | |
98891754 | 427 | iwl_pcie_tfd_unmap(trans, &txq->entries[idx].meta, &tfd_tmp[rd_ptr]); |
214d14d4 JB |
428 | |
429 | /* free SKB */ | |
bf8440e6 | 430 | if (txq->entries) { |
214d14d4 JB |
431 | struct sk_buff *skb; |
432 | ||
ebed633c | 433 | skb = txq->entries[idx].skb; |
214d14d4 | 434 | |
909e9b23 EG |
435 | /* Can be called from irqs-disabled context |
436 | * If skb is not NULL, it means that the whole queue is being | |
437 | * freed and that the queue is not empty - free the skb | |
438 | */ | |
214d14d4 | 439 | if (skb) { |
ed277c93 | 440 | iwl_op_mode_free_skb(trans->op_mode, skb); |
ebed633c | 441 | txq->entries[idx].skb = NULL; |
214d14d4 JB |
442 | } |
443 | } | |
444 | } | |
445 | ||
f02831be | 446 | static int iwl_pcie_txq_build_tfd(struct iwl_trans *trans, struct iwl_txq *txq, |
6d6e68f8 | 447 | dma_addr_t addr, u16 len, bool reset) |
214d14d4 JB |
448 | { |
449 | struct iwl_queue *q; | |
450 | struct iwl_tfd *tfd, *tfd_tmp; | |
451 | u32 num_tbs; | |
452 | ||
453 | q = &txq->q; | |
4ce7cc2b | 454 | tfd_tmp = txq->tfds; |
214d14d4 JB |
455 | tfd = &tfd_tmp[q->write_ptr]; |
456 | ||
f02831be EG |
457 | if (reset) |
458 | memset(tfd, 0, sizeof(*tfd)); | |
459 | ||
460 | num_tbs = iwl_pcie_tfd_get_num_tbs(tfd); | |
461 | ||
462 | /* Each TFD can point to a maximum 20 Tx buffers */ | |
463 | if (num_tbs >= IWL_NUM_OF_TBS) { | |
464 | IWL_ERR(trans, "Error can not send more than %d chunks\n", | |
465 | IWL_NUM_OF_TBS); | |
466 | return -EINVAL; | |
467 | } | |
468 | ||
1092b9bc EP |
469 | if (WARN(addr & ~IWL_TX_DMA_MASK, |
470 | "Unaligned address = %llx\n", (unsigned long long)addr)) | |
f02831be EG |
471 | return -EINVAL; |
472 | ||
f02831be EG |
473 | iwl_pcie_tfd_set_tb(tfd, num_tbs, addr, len); |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | static int iwl_pcie_txq_alloc(struct iwl_trans *trans, | |
479 | struct iwl_txq *txq, int slots_num, | |
480 | u32 txq_id) | |
481 | { | |
482 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); | |
483 | size_t tfd_sz = sizeof(struct iwl_tfd) * TFD_QUEUE_SIZE_MAX; | |
38c0f334 | 484 | size_t scratchbuf_sz; |
f02831be EG |
485 | int i; |
486 | ||
487 | if (WARN_ON(txq->entries || txq->tfds)) | |
488 | return -EINVAL; | |
489 | ||
490 | setup_timer(&txq->stuck_timer, iwl_pcie_txq_stuck_timer, | |
491 | (unsigned long)txq); | |
492 | txq->trans_pcie = trans_pcie; | |
493 | ||
494 | txq->q.n_window = slots_num; | |
495 | ||
496 | txq->entries = kcalloc(slots_num, | |
497 | sizeof(struct iwl_pcie_txq_entry), | |
498 | GFP_KERNEL); | |
499 | ||
500 | if (!txq->entries) | |
501 | goto error; | |
502 | ||
503 | if (txq_id == trans_pcie->cmd_queue) | |
504 | for (i = 0; i < slots_num; i++) { | |
505 | txq->entries[i].cmd = | |
506 | kmalloc(sizeof(struct iwl_device_cmd), | |
507 | GFP_KERNEL); | |
508 | if (!txq->entries[i].cmd) | |
509 | goto error; | |
510 | } | |
511 | ||
512 | /* Circular buffer of transmit frame descriptors (TFDs), | |
513 | * shared with device */ | |
514 | txq->tfds = dma_alloc_coherent(trans->dev, tfd_sz, | |
515 | &txq->q.dma_addr, GFP_KERNEL); | |
d0320f75 | 516 | if (!txq->tfds) |
f02831be | 517 | goto error; |
38c0f334 JB |
518 | |
519 | BUILD_BUG_ON(IWL_HCMD_SCRATCHBUF_SIZE != sizeof(*txq->scratchbufs)); | |
520 | BUILD_BUG_ON(offsetof(struct iwl_pcie_txq_scratch_buf, scratch) != | |
521 | sizeof(struct iwl_cmd_header) + | |
522 | offsetof(struct iwl_tx_cmd, scratch)); | |
523 | ||
524 | scratchbuf_sz = sizeof(*txq->scratchbufs) * slots_num; | |
525 | ||
526 | txq->scratchbufs = dma_alloc_coherent(trans->dev, scratchbuf_sz, | |
527 | &txq->scratchbufs_dma, | |
528 | GFP_KERNEL); | |
529 | if (!txq->scratchbufs) | |
530 | goto err_free_tfds; | |
531 | ||
f02831be EG |
532 | txq->q.id = txq_id; |
533 | ||
534 | return 0; | |
38c0f334 JB |
535 | err_free_tfds: |
536 | dma_free_coherent(trans->dev, tfd_sz, txq->tfds, txq->q.dma_addr); | |
f02831be EG |
537 | error: |
538 | if (txq->entries && txq_id == trans_pcie->cmd_queue) | |
539 | for (i = 0; i < slots_num; i++) | |
540 | kfree(txq->entries[i].cmd); | |
541 | kfree(txq->entries); | |
542 | txq->entries = NULL; | |
543 | ||
544 | return -ENOMEM; | |
545 | ||
546 | } | |
547 | ||
548 | static int iwl_pcie_txq_init(struct iwl_trans *trans, struct iwl_txq *txq, | |
549 | int slots_num, u32 txq_id) | |
550 | { | |
551 | int ret; | |
552 | ||
43aa616f | 553 | txq->need_update = false; |
f02831be EG |
554 | |
555 | /* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise | |
556 | * iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */ | |
557 | BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1)); | |
558 | ||
559 | /* Initialize queue's high/low-water marks, and head/tail indexes */ | |
83f32a4b | 560 | ret = iwl_queue_init(&txq->q, slots_num, txq_id); |
f02831be EG |
561 | if (ret) |
562 | return ret; | |
563 | ||
564 | spin_lock_init(&txq->lock); | |
565 | ||
566 | /* | |
567 | * Tell nic where to find circular buffer of Tx Frame Descriptors for | |
568 | * given Tx queue, and enable the DMA channel used for that queue. | |
569 | * Circular buffer (TFD queue in DRAM) physical base address */ | |
570 | iwl_write_direct32(trans, FH_MEM_CBBC_QUEUE(txq_id), | |
571 | txq->q.dma_addr >> 8); | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
576 | /* | |
577 | * iwl_pcie_txq_unmap - Unmap any remaining DMA mappings and free skb's | |
578 | */ | |
579 | static void iwl_pcie_txq_unmap(struct iwl_trans *trans, int txq_id) | |
580 | { | |
581 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); | |
582 | struct iwl_txq *txq = &trans_pcie->txq[txq_id]; | |
583 | struct iwl_queue *q = &txq->q; | |
f02831be | 584 | |
f02831be EG |
585 | spin_lock_bh(&txq->lock); |
586 | while (q->write_ptr != q->read_ptr) { | |
b967613d EG |
587 | IWL_DEBUG_TX_REPLY(trans, "Q %d Free %d\n", |
588 | txq_id, q->read_ptr); | |
98891754 | 589 | iwl_pcie_txq_free_tfd(trans, txq); |
83f32a4b | 590 | q->read_ptr = iwl_queue_inc_wrap(q->read_ptr); |
f02831be | 591 | } |
b967613d | 592 | txq->active = false; |
f02831be | 593 | spin_unlock_bh(&txq->lock); |
8a487b1a EG |
594 | |
595 | /* just in case - this queue may have been stopped */ | |
596 | iwl_wake_queue(trans, txq); | |
f02831be EG |
597 | } |
598 | ||
599 | /* | |
600 | * iwl_pcie_txq_free - Deallocate DMA queue. | |
601 | * @txq: Transmit queue to deallocate. | |
602 | * | |
603 | * Empty queue by removing and destroying all BD's. | |
604 | * Free all buffers. | |
605 | * 0-fill, but do not free "txq" descriptor structure. | |
606 | */ | |
607 | static void iwl_pcie_txq_free(struct iwl_trans *trans, int txq_id) | |
608 | { | |
609 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); | |
610 | struct iwl_txq *txq = &trans_pcie->txq[txq_id]; | |
611 | struct device *dev = trans->dev; | |
612 | int i; | |
613 | ||
614 | if (WARN_ON(!txq)) | |
615 | return; | |
616 | ||
617 | iwl_pcie_txq_unmap(trans, txq_id); | |
618 | ||
619 | /* De-alloc array of command/tx buffers */ | |
620 | if (txq_id == trans_pcie->cmd_queue) | |
621 | for (i = 0; i < txq->q.n_window; i++) { | |
622 | kfree(txq->entries[i].cmd); | |
f02831be EG |
623 | kfree(txq->entries[i].free_buf); |
624 | } | |
625 | ||
626 | /* De-alloc circular buffer of TFDs */ | |
83f32a4b JB |
627 | if (txq->tfds) { |
628 | dma_free_coherent(dev, | |
629 | sizeof(struct iwl_tfd) * TFD_QUEUE_SIZE_MAX, | |
630 | txq->tfds, txq->q.dma_addr); | |
d21fa2da | 631 | txq->q.dma_addr = 0; |
83f32a4b | 632 | txq->tfds = NULL; |
38c0f334 JB |
633 | |
634 | dma_free_coherent(dev, | |
635 | sizeof(*txq->scratchbufs) * txq->q.n_window, | |
636 | txq->scratchbufs, txq->scratchbufs_dma); | |
f02831be EG |
637 | } |
638 | ||
639 | kfree(txq->entries); | |
640 | txq->entries = NULL; | |
641 | ||
642 | del_timer_sync(&txq->stuck_timer); | |
643 | ||
644 | /* 0-fill queue descriptor structure */ | |
645 | memset(txq, 0, sizeof(*txq)); | |
646 | } | |
647 | ||
f02831be EG |
648 | void iwl_pcie_tx_start(struct iwl_trans *trans, u32 scd_base_addr) |
649 | { | |
650 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); | |
22dc3c95 | 651 | int nq = trans->cfg->base_params->num_of_queues; |
f02831be EG |
652 | int chan; |
653 | u32 reg_val; | |
22dc3c95 JB |
654 | int clear_dwords = (SCD_TRANS_TBL_OFFSET_QUEUE(nq) - |
655 | SCD_CONTEXT_MEM_LOWER_BOUND) / sizeof(u32); | |
f02831be EG |
656 | |
657 | /* make sure all queue are not stopped/used */ | |
658 | memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped)); | |
659 | memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used)); | |
660 | ||
661 | trans_pcie->scd_base_addr = | |
662 | iwl_read_prph(trans, SCD_SRAM_BASE_ADDR); | |
663 | ||
664 | WARN_ON(scd_base_addr != 0 && | |
665 | scd_base_addr != trans_pcie->scd_base_addr); | |
666 | ||
22dc3c95 JB |
667 | /* reset context data, TX status and translation data */ |
668 | iwl_trans_write_mem(trans, trans_pcie->scd_base_addr + | |
669 | SCD_CONTEXT_MEM_LOWER_BOUND, | |
670 | NULL, clear_dwords); | |
f02831be EG |
671 | |
672 | iwl_write_prph(trans, SCD_DRAM_BASE_ADDR, | |
673 | trans_pcie->scd_bc_tbls.dma >> 10); | |
674 | ||
675 | /* The chain extension of the SCD doesn't work well. This feature is | |
676 | * enabled by default by the HW, so we need to disable it manually. | |
677 | */ | |
e03bbb62 EG |
678 | if (trans->cfg->base_params->scd_chain_ext_wa) |
679 | iwl_write_prph(trans, SCD_CHAINEXT_EN, 0); | |
f02831be EG |
680 | |
681 | iwl_trans_ac_txq_enable(trans, trans_pcie->cmd_queue, | |
682 | trans_pcie->cmd_fifo); | |
683 | ||
684 | /* Activate all Tx DMA/FIFO channels */ | |
680073b7 | 685 | iwl_scd_activate_fifos(trans); |
f02831be EG |
686 | |
687 | /* Enable DMA channel */ | |
688 | for (chan = 0; chan < FH_TCSR_CHNL_NUM; chan++) | |
689 | iwl_write_direct32(trans, FH_TCSR_CHNL_TX_CONFIG_REG(chan), | |
690 | FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE | | |
691 | FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE); | |
692 | ||
693 | /* Update FH chicken bits */ | |
694 | reg_val = iwl_read_direct32(trans, FH_TX_CHICKEN_BITS_REG); | |
695 | iwl_write_direct32(trans, FH_TX_CHICKEN_BITS_REG, | |
696 | reg_val | FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN); | |
697 | ||
698 | /* Enable L1-Active */ | |
3073d8c0 EH |
699 | if (trans->cfg->device_family != IWL_DEVICE_FAMILY_8000) |
700 | iwl_clear_bits_prph(trans, APMG_PCIDEV_STT_REG, | |
701 | APMG_PCIDEV_STT_VAL_L1_ACT_DIS); | |
f02831be EG |
702 | } |
703 | ||
ddaf5a5b JB |
704 | void iwl_trans_pcie_tx_reset(struct iwl_trans *trans) |
705 | { | |
706 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); | |
707 | int txq_id; | |
708 | ||
709 | for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues; | |
710 | txq_id++) { | |
711 | struct iwl_txq *txq = &trans_pcie->txq[txq_id]; | |
712 | ||
713 | iwl_write_direct32(trans, FH_MEM_CBBC_QUEUE(txq_id), | |
714 | txq->q.dma_addr >> 8); | |
715 | iwl_pcie_txq_unmap(trans, txq_id); | |
716 | txq->q.read_ptr = 0; | |
717 | txq->q.write_ptr = 0; | |
718 | } | |
719 | ||
720 | /* Tell NIC where to find the "keep warm" buffer */ | |
721 | iwl_write_direct32(trans, FH_KW_MEM_ADDR_REG, | |
722 | trans_pcie->kw.dma >> 4); | |
723 | ||
724 | iwl_pcie_tx_start(trans, trans_pcie->scd_base_addr); | |
725 | } | |
726 | ||
f02831be EG |
727 | /* |
728 | * iwl_pcie_tx_stop - Stop all Tx DMA channels | |
729 | */ | |
730 | int iwl_pcie_tx_stop(struct iwl_trans *trans) | |
731 | { | |
732 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); | |
733 | int ch, txq_id, ret; | |
f02831be EG |
734 | |
735 | /* Turn off all Tx DMA fifos */ | |
7b70bd63 | 736 | spin_lock(&trans_pcie->irq_lock); |
f02831be | 737 | |
680073b7 | 738 | iwl_scd_deactivate_fifos(trans); |
f02831be EG |
739 | |
740 | /* Stop each Tx DMA channel, and wait for it to be idle */ | |
741 | for (ch = 0; ch < FH_TCSR_CHNL_NUM; ch++) { | |
742 | iwl_write_direct32(trans, | |
743 | FH_TCSR_CHNL_TX_CONFIG_REG(ch), 0x0); | |
744 | ret = iwl_poll_direct_bit(trans, FH_TSSR_TX_STATUS_REG, | |
745 | FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch), 1000); | |
746 | if (ret < 0) | |
747 | IWL_ERR(trans, | |
748 | "Failing on timeout while stopping DMA channel %d [0x%08x]\n", | |
749 | ch, | |
750 | iwl_read_direct32(trans, | |
751 | FH_TSSR_TX_STATUS_REG)); | |
752 | } | |
7b70bd63 | 753 | spin_unlock(&trans_pcie->irq_lock); |
f02831be | 754 | |
fba1c627 EG |
755 | /* |
756 | * This function can be called before the op_mode disabled the | |
757 | * queues. This happens when we have an rfkill interrupt. | |
758 | * Since we stop Tx altogether - mark the queues as stopped. | |
759 | */ | |
760 | memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped)); | |
761 | memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used)); | |
762 | ||
763 | /* This can happen: start_hw, stop_device */ | |
764 | if (!trans_pcie->txq) | |
f02831be | 765 | return 0; |
f02831be EG |
766 | |
767 | /* Unmap DMA from host system and free skb's */ | |
768 | for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues; | |
769 | txq_id++) | |
770 | iwl_pcie_txq_unmap(trans, txq_id); | |
771 | ||
772 | return 0; | |
773 | } | |
774 | ||
775 | /* | |
776 | * iwl_trans_tx_free - Free TXQ Context | |
777 | * | |
778 | * Destroy all TX DMA queues and structures | |
779 | */ | |
780 | void iwl_pcie_tx_free(struct iwl_trans *trans) | |
781 | { | |
782 | int txq_id; | |
783 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); | |
784 | ||
785 | /* Tx queues */ | |
786 | if (trans_pcie->txq) { | |
787 | for (txq_id = 0; | |
788 | txq_id < trans->cfg->base_params->num_of_queues; txq_id++) | |
789 | iwl_pcie_txq_free(trans, txq_id); | |
790 | } | |
791 | ||
792 | kfree(trans_pcie->txq); | |
793 | trans_pcie->txq = NULL; | |
794 | ||
795 | iwl_pcie_free_dma_ptr(trans, &trans_pcie->kw); | |
796 | ||
797 | iwl_pcie_free_dma_ptr(trans, &trans_pcie->scd_bc_tbls); | |
798 | } | |
799 | ||
800 | /* | |
801 | * iwl_pcie_tx_alloc - allocate TX context | |
802 | * Allocate all Tx DMA structures and initialize them | |
803 | */ | |
804 | static int iwl_pcie_tx_alloc(struct iwl_trans *trans) | |
805 | { | |
806 | int ret; | |
807 | int txq_id, slots_num; | |
808 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); | |
809 | ||
810 | u16 scd_bc_tbls_size = trans->cfg->base_params->num_of_queues * | |
811 | sizeof(struct iwlagn_scd_bc_tbl); | |
812 | ||
813 | /*It is not allowed to alloc twice, so warn when this happens. | |
814 | * We cannot rely on the previous allocation, so free and fail */ | |
815 | if (WARN_ON(trans_pcie->txq)) { | |
816 | ret = -EINVAL; | |
817 | goto error; | |
818 | } | |
819 | ||
820 | ret = iwl_pcie_alloc_dma_ptr(trans, &trans_pcie->scd_bc_tbls, | |
821 | scd_bc_tbls_size); | |
822 | if (ret) { | |
823 | IWL_ERR(trans, "Scheduler BC Table allocation failed\n"); | |
824 | goto error; | |
825 | } | |
826 | ||
827 | /* Alloc keep-warm buffer */ | |
828 | ret = iwl_pcie_alloc_dma_ptr(trans, &trans_pcie->kw, IWL_KW_SIZE); | |
829 | if (ret) { | |
830 | IWL_ERR(trans, "Keep Warm allocation failed\n"); | |
831 | goto error; | |
832 | } | |
833 | ||
834 | trans_pcie->txq = kcalloc(trans->cfg->base_params->num_of_queues, | |
835 | sizeof(struct iwl_txq), GFP_KERNEL); | |
836 | if (!trans_pcie->txq) { | |
837 | IWL_ERR(trans, "Not enough memory for txq\n"); | |
2ab9ba0f | 838 | ret = -ENOMEM; |
f02831be EG |
839 | goto error; |
840 | } | |
841 | ||
842 | /* Alloc and init all Tx queues, including the command queue (#4/#9) */ | |
843 | for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues; | |
844 | txq_id++) { | |
845 | slots_num = (txq_id == trans_pcie->cmd_queue) ? | |
846 | TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS; | |
847 | ret = iwl_pcie_txq_alloc(trans, &trans_pcie->txq[txq_id], | |
848 | slots_num, txq_id); | |
849 | if (ret) { | |
850 | IWL_ERR(trans, "Tx %d queue alloc failed\n", txq_id); | |
851 | goto error; | |
852 | } | |
853 | } | |
854 | ||
855 | return 0; | |
856 | ||
857 | error: | |
858 | iwl_pcie_tx_free(trans); | |
859 | ||
860 | return ret; | |
861 | } | |
862 | int iwl_pcie_tx_init(struct iwl_trans *trans) | |
863 | { | |
864 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); | |
865 | int ret; | |
866 | int txq_id, slots_num; | |
f02831be EG |
867 | bool alloc = false; |
868 | ||
869 | if (!trans_pcie->txq) { | |
870 | ret = iwl_pcie_tx_alloc(trans); | |
871 | if (ret) | |
872 | goto error; | |
873 | alloc = true; | |
874 | } | |
875 | ||
7b70bd63 | 876 | spin_lock(&trans_pcie->irq_lock); |
f02831be EG |
877 | |
878 | /* Turn off all Tx DMA fifos */ | |
680073b7 | 879 | iwl_scd_deactivate_fifos(trans); |
f02831be EG |
880 | |
881 | /* Tell NIC where to find the "keep warm" buffer */ | |
882 | iwl_write_direct32(trans, FH_KW_MEM_ADDR_REG, | |
883 | trans_pcie->kw.dma >> 4); | |
884 | ||
7b70bd63 | 885 | spin_unlock(&trans_pcie->irq_lock); |
f02831be EG |
886 | |
887 | /* Alloc and init all Tx queues, including the command queue (#4/#9) */ | |
888 | for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues; | |
889 | txq_id++) { | |
890 | slots_num = (txq_id == trans_pcie->cmd_queue) ? | |
891 | TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS; | |
892 | ret = iwl_pcie_txq_init(trans, &trans_pcie->txq[txq_id], | |
893 | slots_num, txq_id); | |
894 | if (ret) { | |
895 | IWL_ERR(trans, "Tx %d queue init failed\n", txq_id); | |
896 | goto error; | |
897 | } | |
898 | } | |
899 | ||
900 | return 0; | |
901 | error: | |
902 | /*Upon error, free only if we allocated something */ | |
903 | if (alloc) | |
904 | iwl_pcie_tx_free(trans); | |
905 | return ret; | |
906 | } | |
907 | ||
908 | static inline void iwl_pcie_txq_progress(struct iwl_trans_pcie *trans_pcie, | |
909 | struct iwl_txq *txq) | |
910 | { | |
911 | if (!trans_pcie->wd_timeout) | |
912 | return; | |
913 | ||
914 | /* | |
915 | * if empty delete timer, otherwise move timer forward | |
916 | * since we're making progress on this queue | |
917 | */ | |
918 | if (txq->q.read_ptr == txq->q.write_ptr) | |
919 | del_timer(&txq->stuck_timer); | |
920 | else | |
921 | mod_timer(&txq->stuck_timer, jiffies + trans_pcie->wd_timeout); | |
922 | } | |
923 | ||
924 | /* Frees buffers until index _not_ inclusive */ | |
f6d497cd EG |
925 | void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn, |
926 | struct sk_buff_head *skbs) | |
f02831be EG |
927 | { |
928 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); | |
929 | struct iwl_txq *txq = &trans_pcie->txq[txq_id]; | |
83f32a4b | 930 | int tfd_num = ssn & (TFD_QUEUE_SIZE_MAX - 1); |
f02831be EG |
931 | struct iwl_queue *q = &txq->q; |
932 | int last_to_free; | |
f02831be EG |
933 | |
934 | /* This function is not meant to release cmd queue*/ | |
935 | if (WARN_ON(txq_id == trans_pcie->cmd_queue)) | |
f6d497cd | 936 | return; |
214d14d4 | 937 | |
2bfb5092 | 938 | spin_lock_bh(&txq->lock); |
f6d497cd | 939 | |
b967613d EG |
940 | if (!txq->active) { |
941 | IWL_DEBUG_TX_QUEUES(trans, "Q %d inactive - ignoring idx %d\n", | |
942 | txq_id, ssn); | |
943 | goto out; | |
944 | } | |
945 | ||
f6d497cd EG |
946 | if (txq->q.read_ptr == tfd_num) |
947 | goto out; | |
948 | ||
949 | IWL_DEBUG_TX_REPLY(trans, "[Q %d] %d -> %d (%d)\n", | |
950 | txq_id, txq->q.read_ptr, tfd_num, ssn); | |
214d14d4 | 951 | |
f02831be EG |
952 | /*Since we free until index _not_ inclusive, the one before index is |
953 | * the last we will free. This one must be used */ | |
83f32a4b | 954 | last_to_free = iwl_queue_dec_wrap(tfd_num); |
f02831be | 955 | |
6ca6ebc1 | 956 | if (!iwl_queue_used(q, last_to_free)) { |
f02831be EG |
957 | IWL_ERR(trans, |
958 | "%s: Read index for DMA queue txq id (%d), last_to_free %d is out of range [0-%d] %d %d.\n", | |
83f32a4b | 959 | __func__, txq_id, last_to_free, TFD_QUEUE_SIZE_MAX, |
f02831be | 960 | q->write_ptr, q->read_ptr); |
f6d497cd | 961 | goto out; |
214d14d4 JB |
962 | } |
963 | ||
f02831be | 964 | if (WARN_ON(!skb_queue_empty(skbs))) |
f6d497cd | 965 | goto out; |
214d14d4 | 966 | |
f02831be | 967 | for (; |
f6d497cd | 968 | q->read_ptr != tfd_num; |
83f32a4b | 969 | q->read_ptr = iwl_queue_inc_wrap(q->read_ptr)) { |
214d14d4 | 970 | |
f02831be EG |
971 | if (WARN_ON_ONCE(txq->entries[txq->q.read_ptr].skb == NULL)) |
972 | continue; | |
214d14d4 | 973 | |
f02831be | 974 | __skb_queue_tail(skbs, txq->entries[txq->q.read_ptr].skb); |
214d14d4 | 975 | |
f02831be | 976 | txq->entries[txq->q.read_ptr].skb = NULL; |
fd4abac5 | 977 | |
f02831be | 978 | iwl_pcie_txq_inval_byte_cnt_tbl(trans, txq); |
fd4abac5 | 979 | |
98891754 | 980 | iwl_pcie_txq_free_tfd(trans, txq); |
f02831be | 981 | } |
fd4abac5 | 982 | |
f02831be EG |
983 | iwl_pcie_txq_progress(trans_pcie, txq); |
984 | ||
f6d497cd EG |
985 | if (iwl_queue_space(&txq->q) > txq->q.low_mark) |
986 | iwl_wake_queue(trans, txq); | |
987 | out: | |
2bfb5092 | 988 | spin_unlock_bh(&txq->lock); |
1053d35f RR |
989 | } |
990 | ||
f02831be EG |
991 | /* |
992 | * iwl_pcie_cmdq_reclaim - Reclaim TX command queue entries already Tx'd | |
993 | * | |
994 | * When FW advances 'R' index, all entries between old and new 'R' index | |
995 | * need to be reclaimed. As result, some free space forms. If there is | |
996 | * enough free space (> low mark), wake the stack that feeds us. | |
997 | */ | |
998 | static void iwl_pcie_cmdq_reclaim(struct iwl_trans *trans, int txq_id, int idx) | |
48d42c42 | 999 | { |
f02831be EG |
1000 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
1001 | struct iwl_txq *txq = &trans_pcie->txq[txq_id]; | |
1002 | struct iwl_queue *q = &txq->q; | |
b9439491 | 1003 | unsigned long flags; |
f02831be | 1004 | int nfreed = 0; |
48d42c42 | 1005 | |
f02831be | 1006 | lockdep_assert_held(&txq->lock); |
48d42c42 | 1007 | |
83f32a4b | 1008 | if ((idx >= TFD_QUEUE_SIZE_MAX) || (!iwl_queue_used(q, idx))) { |
f02831be EG |
1009 | IWL_ERR(trans, |
1010 | "%s: Read index for DMA queue txq id (%d), index %d is out of range [0-%d] %d %d.\n", | |
83f32a4b | 1011 | __func__, txq_id, idx, TFD_QUEUE_SIZE_MAX, |
f02831be EG |
1012 | q->write_ptr, q->read_ptr); |
1013 | return; | |
1014 | } | |
48d42c42 | 1015 | |
83f32a4b JB |
1016 | for (idx = iwl_queue_inc_wrap(idx); q->read_ptr != idx; |
1017 | q->read_ptr = iwl_queue_inc_wrap(q->read_ptr)) { | |
48d42c42 | 1018 | |
f02831be EG |
1019 | if (nfreed++ > 0) { |
1020 | IWL_ERR(trans, "HCMD skipped: index (%d) %d %d\n", | |
1021 | idx, q->write_ptr, q->read_ptr); | |
4c9706dc | 1022 | iwl_force_nmi(trans); |
f02831be EG |
1023 | } |
1024 | } | |
1025 | ||
e7f76340 EG |
1026 | if (trans->cfg->base_params->apmg_wake_up_wa && |
1027 | q->read_ptr == q->write_ptr) { | |
b9439491 EG |
1028 | spin_lock_irqsave(&trans_pcie->reg_lock, flags); |
1029 | WARN_ON(!trans_pcie->cmd_in_flight); | |
1030 | trans_pcie->cmd_in_flight = false; | |
1031 | __iwl_trans_pcie_clear_bit(trans, | |
1032 | CSR_GP_CNTRL, | |
1033 | CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); | |
1034 | spin_unlock_irqrestore(&trans_pcie->reg_lock, flags); | |
1035 | } | |
1036 | ||
f02831be | 1037 | iwl_pcie_txq_progress(trans_pcie, txq); |
48d42c42 EG |
1038 | } |
1039 | ||
f02831be | 1040 | static int iwl_pcie_txq_set_ratid_map(struct iwl_trans *trans, u16 ra_tid, |
1ce8658c | 1041 | u16 txq_id) |
48d42c42 | 1042 | { |
20d3b647 | 1043 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
48d42c42 EG |
1044 | u32 tbl_dw_addr; |
1045 | u32 tbl_dw; | |
1046 | u16 scd_q2ratid; | |
1047 | ||
1048 | scd_q2ratid = ra_tid & SCD_QUEUE_RA_TID_MAP_RATID_MSK; | |
1049 | ||
105183b1 | 1050 | tbl_dw_addr = trans_pcie->scd_base_addr + |
48d42c42 EG |
1051 | SCD_TRANS_TBL_OFFSET_QUEUE(txq_id); |
1052 | ||
4fd442db | 1053 | tbl_dw = iwl_trans_read_mem32(trans, tbl_dw_addr); |
48d42c42 EG |
1054 | |
1055 | if (txq_id & 0x1) | |
1056 | tbl_dw = (scd_q2ratid << 16) | (tbl_dw & 0x0000FFFF); | |
1057 | else | |
1058 | tbl_dw = scd_q2ratid | (tbl_dw & 0xFFFF0000); | |
1059 | ||
4fd442db | 1060 | iwl_trans_write_mem32(trans, tbl_dw_addr, tbl_dw); |
48d42c42 EG |
1061 | |
1062 | return 0; | |
1063 | } | |
1064 | ||
bd5f6a34 EG |
1065 | /* Receiver address (actually, Rx station's index into station table), |
1066 | * combined with Traffic ID (QOS priority), in format used by Tx Scheduler */ | |
1067 | #define BUILD_RAxTID(sta_id, tid) (((sta_id) << 4) + (tid)) | |
1068 | ||
fea7795f JB |
1069 | void iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int txq_id, u16 ssn, |
1070 | const struct iwl_trans_txq_scd_cfg *cfg) | |
48d42c42 | 1071 | { |
9eae88fa | 1072 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
d4578ea8 | 1073 | int fifo = -1; |
4beaf6c2 | 1074 | |
9eae88fa JB |
1075 | if (test_and_set_bit(txq_id, trans_pcie->queue_used)) |
1076 | WARN_ONCE(1, "queue %d already used - expect issues", txq_id); | |
48d42c42 | 1077 | |
d4578ea8 JB |
1078 | if (cfg) { |
1079 | fifo = cfg->fifo; | |
48d42c42 | 1080 | |
d4578ea8 JB |
1081 | /* Stop this Tx queue before configuring it */ |
1082 | iwl_scd_txq_set_inactive(trans, txq_id); | |
4beaf6c2 | 1083 | |
d4578ea8 JB |
1084 | /* Set this queue as a chain-building queue unless it is CMD */ |
1085 | if (txq_id != trans_pcie->cmd_queue) | |
1086 | iwl_scd_txq_set_chain(trans, txq_id); | |
48d42c42 | 1087 | |
d4578ea8 JB |
1088 | /* If this queue is mapped to a certain station: it is an AGG */ |
1089 | if (cfg->sta_id >= 0) { | |
1090 | u16 ra_tid = BUILD_RAxTID(cfg->sta_id, cfg->tid); | |
48d42c42 | 1091 | |
d4578ea8 JB |
1092 | /* Map receiver-address / traffic-ID to this queue */ |
1093 | iwl_pcie_txq_set_ratid_map(trans, ra_tid, txq_id); | |
f4772520 | 1094 | |
d4578ea8 JB |
1095 | /* enable aggregations for the queue */ |
1096 | iwl_scd_txq_enable_agg(trans, txq_id); | |
1097 | trans_pcie->txq[txq_id].ampdu = true; | |
1098 | } else { | |
1099 | /* | |
1100 | * disable aggregations for the queue, this will also | |
1101 | * make the ra_tid mapping configuration irrelevant | |
1102 | * since it is now a non-AGG queue. | |
1103 | */ | |
1104 | iwl_scd_txq_disable_agg(trans, txq_id); | |
1105 | ||
1106 | ssn = trans_pcie->txq[txq_id].q.read_ptr; | |
1107 | } | |
4beaf6c2 | 1108 | } |
48d42c42 EG |
1109 | |
1110 | /* Place first TFD at index corresponding to start sequence number. | |
1111 | * Assumes that ssn_idx is valid (!= 0xFFF) */ | |
822e8b2a EG |
1112 | trans_pcie->txq[txq_id].q.read_ptr = (ssn & 0xff); |
1113 | trans_pcie->txq[txq_id].q.write_ptr = (ssn & 0xff); | |
1ce8658c | 1114 | |
d4578ea8 JB |
1115 | if (cfg) { |
1116 | u8 frame_limit = cfg->frame_limit; | |
48d42c42 | 1117 | |
d4578ea8 JB |
1118 | iwl_write_direct32(trans, HBUS_TARG_WRPTR, |
1119 | (ssn & 0xff) | (txq_id << 8)); | |
1120 | iwl_write_prph(trans, SCD_QUEUE_RDPTR(txq_id), ssn); | |
1121 | ||
1122 | /* Set up Tx window size and frame limit for this queue */ | |
1123 | iwl_trans_write_mem32(trans, trans_pcie->scd_base_addr + | |
1124 | SCD_CONTEXT_QUEUE_OFFSET(txq_id), 0); | |
1125 | iwl_trans_write_mem32(trans, | |
1126 | trans_pcie->scd_base_addr + | |
9eae88fa JB |
1127 | SCD_CONTEXT_QUEUE_OFFSET(txq_id) + sizeof(u32), |
1128 | ((frame_limit << SCD_QUEUE_CTX_REG2_WIN_SIZE_POS) & | |
d4578ea8 | 1129 | SCD_QUEUE_CTX_REG2_WIN_SIZE_MSK) | |
9eae88fa | 1130 | ((frame_limit << SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) & |
d4578ea8 JB |
1131 | SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK)); |
1132 | ||
1133 | /* Set up status area in SRAM, map to Tx DMA/FIFO, activate */ | |
1134 | iwl_write_prph(trans, SCD_QUEUE_STATUS_BITS(txq_id), | |
1135 | (1 << SCD_QUEUE_STTS_REG_POS_ACTIVE) | | |
1136 | (cfg->fifo << SCD_QUEUE_STTS_REG_POS_TXF) | | |
1137 | (1 << SCD_QUEUE_STTS_REG_POS_WSL) | | |
1138 | SCD_QUEUE_STTS_REG_MSK); | |
1139 | } | |
1140 | ||
b967613d | 1141 | trans_pcie->txq[txq_id].active = true; |
1ce8658c | 1142 | IWL_DEBUG_TX_QUEUES(trans, "Activate queue %d on FIFO %d WrPtr: %d\n", |
d4578ea8 | 1143 | txq_id, fifo, ssn & 0xff); |
4beaf6c2 EG |
1144 | } |
1145 | ||
d4578ea8 JB |
1146 | void iwl_trans_pcie_txq_disable(struct iwl_trans *trans, int txq_id, |
1147 | bool configure_scd) | |
288712a6 | 1148 | { |
8ad71bef | 1149 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
986ea6c9 EG |
1150 | u32 stts_addr = trans_pcie->scd_base_addr + |
1151 | SCD_TX_STTS_QUEUE_OFFSET(txq_id); | |
1152 | static const u32 zero_val[4] = {}; | |
288712a6 | 1153 | |
fba1c627 EG |
1154 | /* |
1155 | * Upon HW Rfkill - we stop the device, and then stop the queues | |
1156 | * in the op_mode. Just for the sake of the simplicity of the op_mode, | |
1157 | * allow the op_mode to call txq_disable after it already called | |
1158 | * stop_device. | |
1159 | */ | |
9eae88fa | 1160 | if (!test_and_clear_bit(txq_id, trans_pcie->queue_used)) { |
fba1c627 EG |
1161 | WARN_ONCE(test_bit(STATUS_DEVICE_ENABLED, &trans->status), |
1162 | "queue %d not used", txq_id); | |
9eae88fa | 1163 | return; |
48d42c42 EG |
1164 | } |
1165 | ||
d4578ea8 JB |
1166 | if (configure_scd) { |
1167 | iwl_scd_txq_set_inactive(trans, txq_id); | |
ac928f8d | 1168 | |
d4578ea8 JB |
1169 | iwl_trans_write_mem(trans, stts_addr, (void *)zero_val, |
1170 | ARRAY_SIZE(zero_val)); | |
1171 | } | |
986ea6c9 | 1172 | |
990aa6d7 | 1173 | iwl_pcie_txq_unmap(trans, txq_id); |
68972c46 | 1174 | trans_pcie->txq[txq_id].ampdu = false; |
6c3fd3f0 | 1175 | |
1ce8658c | 1176 | IWL_DEBUG_TX_QUEUES(trans, "Deactivate queue %d\n", txq_id); |
48d42c42 EG |
1177 | } |
1178 | ||
fd4abac5 TW |
1179 | /*************** HOST COMMAND QUEUE FUNCTIONS *****/ |
1180 | ||
990aa6d7 | 1181 | /* |
f02831be | 1182 | * iwl_pcie_enqueue_hcmd - enqueue a uCode command |
fd4abac5 | 1183 | * @priv: device private data point |
e89044d7 | 1184 | * @cmd: a pointer to the ucode command structure |
fd4abac5 | 1185 | * |
e89044d7 EP |
1186 | * The function returns < 0 values to indicate the operation |
1187 | * failed. On success, it returns the index (>= 0) of command in the | |
fd4abac5 TW |
1188 | * command queue. |
1189 | */ | |
f02831be EG |
1190 | static int iwl_pcie_enqueue_hcmd(struct iwl_trans *trans, |
1191 | struct iwl_host_cmd *cmd) | |
fd4abac5 | 1192 | { |
8ad71bef | 1193 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
990aa6d7 | 1194 | struct iwl_txq *txq = &trans_pcie->txq[trans_pcie->cmd_queue]; |
fd4abac5 | 1195 | struct iwl_queue *q = &txq->q; |
c2acea8e JB |
1196 | struct iwl_device_cmd *out_cmd; |
1197 | struct iwl_cmd_meta *out_meta; | |
b9439491 | 1198 | unsigned long flags; |
f4feb8ac | 1199 | void *dup_buf = NULL; |
fd4abac5 | 1200 | dma_addr_t phys_addr; |
f4feb8ac | 1201 | int idx; |
38c0f334 | 1202 | u16 copy_size, cmd_size, scratch_size; |
4ce7cc2b | 1203 | bool had_nocopy = false; |
b9439491 | 1204 | int i, ret; |
96791422 | 1205 | u32 cmd_pos; |
1afbfb60 JB |
1206 | const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD]; |
1207 | u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD]; | |
fd4abac5 | 1208 | |
4ce7cc2b JB |
1209 | copy_size = sizeof(out_cmd->hdr); |
1210 | cmd_size = sizeof(out_cmd->hdr); | |
1211 | ||
1212 | /* need one for the header if the first is NOCOPY */ | |
1afbfb60 | 1213 | BUILD_BUG_ON(IWL_MAX_CMD_TBS_PER_TFD > IWL_NUM_OF_TBS - 1); |
4ce7cc2b | 1214 | |
1afbfb60 | 1215 | for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) { |
8a964f44 JB |
1216 | cmddata[i] = cmd->data[i]; |
1217 | cmdlen[i] = cmd->len[i]; | |
1218 | ||
4ce7cc2b JB |
1219 | if (!cmd->len[i]) |
1220 | continue; | |
8a964f44 | 1221 | |
38c0f334 JB |
1222 | /* need at least IWL_HCMD_SCRATCHBUF_SIZE copied */ |
1223 | if (copy_size < IWL_HCMD_SCRATCHBUF_SIZE) { | |
1224 | int copy = IWL_HCMD_SCRATCHBUF_SIZE - copy_size; | |
8a964f44 JB |
1225 | |
1226 | if (copy > cmdlen[i]) | |
1227 | copy = cmdlen[i]; | |
1228 | cmdlen[i] -= copy; | |
1229 | cmddata[i] += copy; | |
1230 | copy_size += copy; | |
1231 | } | |
1232 | ||
4ce7cc2b JB |
1233 | if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) { |
1234 | had_nocopy = true; | |
f4feb8ac JB |
1235 | if (WARN_ON(cmd->dataflags[i] & IWL_HCMD_DFL_DUP)) { |
1236 | idx = -EINVAL; | |
1237 | goto free_dup_buf; | |
1238 | } | |
1239 | } else if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP) { | |
1240 | /* | |
1241 | * This is also a chunk that isn't copied | |
1242 | * to the static buffer so set had_nocopy. | |
1243 | */ | |
1244 | had_nocopy = true; | |
1245 | ||
1246 | /* only allowed once */ | |
1247 | if (WARN_ON(dup_buf)) { | |
1248 | idx = -EINVAL; | |
1249 | goto free_dup_buf; | |
1250 | } | |
1251 | ||
8a964f44 | 1252 | dup_buf = kmemdup(cmddata[i], cmdlen[i], |
f4feb8ac JB |
1253 | GFP_ATOMIC); |
1254 | if (!dup_buf) | |
1255 | return -ENOMEM; | |
4ce7cc2b JB |
1256 | } else { |
1257 | /* NOCOPY must not be followed by normal! */ | |
f4feb8ac JB |
1258 | if (WARN_ON(had_nocopy)) { |
1259 | idx = -EINVAL; | |
1260 | goto free_dup_buf; | |
1261 | } | |
8a964f44 | 1262 | copy_size += cmdlen[i]; |
4ce7cc2b JB |
1263 | } |
1264 | cmd_size += cmd->len[i]; | |
1265 | } | |
fd4abac5 | 1266 | |
3e41ace5 JB |
1267 | /* |
1268 | * If any of the command structures end up being larger than | |
4ce7cc2b JB |
1269 | * the TFD_MAX_PAYLOAD_SIZE and they aren't dynamically |
1270 | * allocated into separate TFDs, then we will need to | |
1271 | * increase the size of the buffers. | |
3e41ace5 | 1272 | */ |
2a79e45e JB |
1273 | if (WARN(copy_size > TFD_MAX_PAYLOAD_SIZE, |
1274 | "Command %s (%#x) is too large (%d bytes)\n", | |
990aa6d7 | 1275 | get_cmd_string(trans_pcie, cmd->id), cmd->id, copy_size)) { |
f4feb8ac JB |
1276 | idx = -EINVAL; |
1277 | goto free_dup_buf; | |
1278 | } | |
fd4abac5 | 1279 | |
015c15e1 | 1280 | spin_lock_bh(&txq->lock); |
3598e177 | 1281 | |
c2acea8e | 1282 | if (iwl_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) { |
015c15e1 | 1283 | spin_unlock_bh(&txq->lock); |
3598e177 | 1284 | |
6d8f6eeb | 1285 | IWL_ERR(trans, "No space in command queue\n"); |
0e781842 | 1286 | iwl_op_mode_cmd_queue_full(trans->op_mode); |
f4feb8ac JB |
1287 | idx = -ENOSPC; |
1288 | goto free_dup_buf; | |
fd4abac5 TW |
1289 | } |
1290 | ||
4ce7cc2b | 1291 | idx = get_cmd_index(q, q->write_ptr); |
bf8440e6 JB |
1292 | out_cmd = txq->entries[idx].cmd; |
1293 | out_meta = &txq->entries[idx].meta; | |
c2acea8e | 1294 | |
8ce73f3a | 1295 | memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */ |
c2acea8e JB |
1296 | if (cmd->flags & CMD_WANT_SKB) |
1297 | out_meta->source = cmd; | |
fd4abac5 | 1298 | |
4ce7cc2b | 1299 | /* set up the header */ |
fd4abac5 | 1300 | |
4ce7cc2b | 1301 | out_cmd->hdr.cmd = cmd->id; |
fd4abac5 | 1302 | out_cmd->hdr.flags = 0; |
cefeaa5f | 1303 | out_cmd->hdr.sequence = |
c6f600fc | 1304 | cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) | |
cefeaa5f | 1305 | INDEX_TO_SEQ(q->write_ptr)); |
4ce7cc2b JB |
1306 | |
1307 | /* and copy the data that needs to be copied */ | |
96791422 | 1308 | cmd_pos = offsetof(struct iwl_device_cmd, payload); |
8a964f44 | 1309 | copy_size = sizeof(out_cmd->hdr); |
1afbfb60 | 1310 | for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) { |
4d075007 | 1311 | int copy; |
8a964f44 | 1312 | |
cc904c71 | 1313 | if (!cmd->len[i]) |
4ce7cc2b | 1314 | continue; |
8a964f44 | 1315 | |
8a964f44 JB |
1316 | /* copy everything if not nocopy/dup */ |
1317 | if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY | | |
4d075007 | 1318 | IWL_HCMD_DFL_DUP))) { |
8a964f44 JB |
1319 | copy = cmd->len[i]; |
1320 | ||
8a964f44 JB |
1321 | memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy); |
1322 | cmd_pos += copy; | |
1323 | copy_size += copy; | |
4d075007 JB |
1324 | continue; |
1325 | } | |
1326 | ||
1327 | /* | |
1328 | * Otherwise we need at least IWL_HCMD_SCRATCHBUF_SIZE copied | |
1329 | * in total (for the scratchbuf handling), but copy up to what | |
1330 | * we can fit into the payload for debug dump purposes. | |
1331 | */ | |
1332 | copy = min_t(int, TFD_MAX_PAYLOAD_SIZE - cmd_pos, cmd->len[i]); | |
1333 | ||
1334 | memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy); | |
1335 | cmd_pos += copy; | |
1336 | ||
1337 | /* However, treat copy_size the proper way, we need it below */ | |
1338 | if (copy_size < IWL_HCMD_SCRATCHBUF_SIZE) { | |
1339 | copy = IWL_HCMD_SCRATCHBUF_SIZE - copy_size; | |
1340 | ||
1341 | if (copy > cmd->len[i]) | |
1342 | copy = cmd->len[i]; | |
1343 | copy_size += copy; | |
8a964f44 | 1344 | } |
96791422 EG |
1345 | } |
1346 | ||
d9fb6465 | 1347 | IWL_DEBUG_HC(trans, |
20d3b647 | 1348 | "Sending command %s (#%x), seq: 0x%04X, %d bytes at %d[%d]:%d\n", |
990aa6d7 | 1349 | get_cmd_string(trans_pcie, out_cmd->hdr.cmd), |
20d3b647 JB |
1350 | out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence), |
1351 | cmd_size, q->write_ptr, idx, trans_pcie->cmd_queue); | |
4ce7cc2b | 1352 | |
38c0f334 JB |
1353 | /* start the TFD with the scratchbuf */ |
1354 | scratch_size = min_t(int, copy_size, IWL_HCMD_SCRATCHBUF_SIZE); | |
1355 | memcpy(&txq->scratchbufs[q->write_ptr], &out_cmd->hdr, scratch_size); | |
1356 | iwl_pcie_txq_build_tfd(trans, txq, | |
1357 | iwl_pcie_get_scratchbuf_dma(txq, q->write_ptr), | |
6d6e68f8 | 1358 | scratch_size, true); |
38c0f334 JB |
1359 | |
1360 | /* map first command fragment, if any remains */ | |
1361 | if (copy_size > scratch_size) { | |
1362 | phys_addr = dma_map_single(trans->dev, | |
1363 | ((u8 *)&out_cmd->hdr) + scratch_size, | |
1364 | copy_size - scratch_size, | |
1365 | DMA_TO_DEVICE); | |
1366 | if (dma_mapping_error(trans->dev, phys_addr)) { | |
1367 | iwl_pcie_tfd_unmap(trans, out_meta, | |
1368 | &txq->tfds[q->write_ptr]); | |
1369 | idx = -ENOMEM; | |
1370 | goto out; | |
1371 | } | |
8a964f44 | 1372 | |
38c0f334 | 1373 | iwl_pcie_txq_build_tfd(trans, txq, phys_addr, |
6d6e68f8 | 1374 | copy_size - scratch_size, false); |
2c46f72e JB |
1375 | } |
1376 | ||
8a964f44 | 1377 | /* map the remaining (adjusted) nocopy/dup fragments */ |
1afbfb60 | 1378 | for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) { |
8a964f44 | 1379 | const void *data = cmddata[i]; |
f4feb8ac | 1380 | |
8a964f44 | 1381 | if (!cmdlen[i]) |
4ce7cc2b | 1382 | continue; |
f4feb8ac JB |
1383 | if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY | |
1384 | IWL_HCMD_DFL_DUP))) | |
4ce7cc2b | 1385 | continue; |
f4feb8ac JB |
1386 | if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP) |
1387 | data = dup_buf; | |
1388 | phys_addr = dma_map_single(trans->dev, (void *)data, | |
98891754 | 1389 | cmdlen[i], DMA_TO_DEVICE); |
1042db2a | 1390 | if (dma_mapping_error(trans->dev, phys_addr)) { |
f02831be | 1391 | iwl_pcie_tfd_unmap(trans, out_meta, |
98891754 | 1392 | &txq->tfds[q->write_ptr]); |
4ce7cc2b JB |
1393 | idx = -ENOMEM; |
1394 | goto out; | |
1395 | } | |
1396 | ||
6d6e68f8 | 1397 | iwl_pcie_txq_build_tfd(trans, txq, phys_addr, cmdlen[i], false); |
4ce7cc2b | 1398 | } |
df833b1d | 1399 | |
afaf6b57 | 1400 | out_meta->flags = cmd->flags; |
f4feb8ac JB |
1401 | if (WARN_ON_ONCE(txq->entries[idx].free_buf)) |
1402 | kfree(txq->entries[idx].free_buf); | |
1403 | txq->entries[idx].free_buf = dup_buf; | |
2c46f72e | 1404 | |
8a964f44 | 1405 | trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size, &out_cmd->hdr); |
df833b1d | 1406 | |
7c5ba4a8 JB |
1407 | /* start timer if queue currently empty */ |
1408 | if (q->read_ptr == q->write_ptr && trans_pcie->wd_timeout) | |
1409 | mod_timer(&txq->stuck_timer, jiffies + trans_pcie->wd_timeout); | |
1410 | ||
b9439491 EG |
1411 | spin_lock_irqsave(&trans_pcie->reg_lock, flags); |
1412 | ||
1413 | /* | |
1414 | * wake up the NIC to make sure that the firmware will see the host | |
1415 | * command - we will let the NIC sleep once all the host commands | |
e7f76340 EG |
1416 | * returned. This needs to be done only on NICs that have |
1417 | * apmg_wake_up_wa set. | |
b9439491 | 1418 | */ |
e7f76340 EG |
1419 | if (trans->cfg->base_params->apmg_wake_up_wa && |
1420 | !trans_pcie->cmd_in_flight) { | |
b9439491 EG |
1421 | trans_pcie->cmd_in_flight = true; |
1422 | __iwl_trans_pcie_set_bit(trans, CSR_GP_CNTRL, | |
1423 | CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); | |
1424 | ret = iwl_poll_bit(trans, CSR_GP_CNTRL, | |
1425 | CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN, | |
1426 | (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY | | |
1427 | CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), | |
1428 | 15000); | |
1429 | if (ret < 0) { | |
1430 | __iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL, | |
1431 | CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); | |
1432 | spin_unlock_irqrestore(&trans_pcie->reg_lock, flags); | |
1433 | trans_pcie->cmd_in_flight = false; | |
d536c32b | 1434 | IWL_ERR(trans, "Failed to wake NIC for hcmd\n"); |
b9439491 EG |
1435 | idx = -EIO; |
1436 | goto out; | |
1437 | } | |
1438 | } | |
1439 | ||
fd4abac5 | 1440 | /* Increment and update queue's write index */ |
83f32a4b | 1441 | q->write_ptr = iwl_queue_inc_wrap(q->write_ptr); |
990aa6d7 | 1442 | iwl_pcie_txq_inc_wr_ptr(trans, txq); |
fd4abac5 | 1443 | |
b9439491 EG |
1444 | spin_unlock_irqrestore(&trans_pcie->reg_lock, flags); |
1445 | ||
2c46f72e | 1446 | out: |
015c15e1 | 1447 | spin_unlock_bh(&txq->lock); |
f4feb8ac JB |
1448 | free_dup_buf: |
1449 | if (idx < 0) | |
1450 | kfree(dup_buf); | |
7bfedc59 | 1451 | return idx; |
fd4abac5 TW |
1452 | } |
1453 | ||
990aa6d7 EG |
1454 | /* |
1455 | * iwl_pcie_hcmd_complete - Pull unused buffers off the queue and reclaim them | |
17b88929 | 1456 | * @rxb: Rx buffer to reclaim |
247c61d6 EG |
1457 | * @handler_status: return value of the handler of the command |
1458 | * (put in setup_rx_handlers) | |
17b88929 TW |
1459 | * |
1460 | * If an Rx buffer has an async callback associated with it the callback | |
1461 | * will be executed. The attached skb (if present) will only be freed | |
1462 | * if the callback returns 1 | |
1463 | */ | |
990aa6d7 EG |
1464 | void iwl_pcie_hcmd_complete(struct iwl_trans *trans, |
1465 | struct iwl_rx_cmd_buffer *rxb, int handler_status) | |
17b88929 | 1466 | { |
2f301227 | 1467 | struct iwl_rx_packet *pkt = rxb_addr(rxb); |
17b88929 TW |
1468 | u16 sequence = le16_to_cpu(pkt->hdr.sequence); |
1469 | int txq_id = SEQ_TO_QUEUE(sequence); | |
1470 | int index = SEQ_TO_INDEX(sequence); | |
17b88929 | 1471 | int cmd_index; |
c2acea8e JB |
1472 | struct iwl_device_cmd *cmd; |
1473 | struct iwl_cmd_meta *meta; | |
8ad71bef | 1474 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
990aa6d7 | 1475 | struct iwl_txq *txq = &trans_pcie->txq[trans_pcie->cmd_queue]; |
17b88929 TW |
1476 | |
1477 | /* If a Tx command is being handled and it isn't in the actual | |
1478 | * command queue then there a command routing bug has been introduced | |
1479 | * in the queue management code. */ | |
c6f600fc | 1480 | if (WARN(txq_id != trans_pcie->cmd_queue, |
13bb9483 | 1481 | "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n", |
20d3b647 JB |
1482 | txq_id, trans_pcie->cmd_queue, sequence, |
1483 | trans_pcie->txq[trans_pcie->cmd_queue].q.read_ptr, | |
1484 | trans_pcie->txq[trans_pcie->cmd_queue].q.write_ptr)) { | |
3e10caeb | 1485 | iwl_print_hex_error(trans, pkt, 32); |
55d6a3cd | 1486 | return; |
01ef9323 | 1487 | } |
17b88929 | 1488 | |
2bfb5092 | 1489 | spin_lock_bh(&txq->lock); |
015c15e1 | 1490 | |
4ce7cc2b | 1491 | cmd_index = get_cmd_index(&txq->q, index); |
bf8440e6 JB |
1492 | cmd = txq->entries[cmd_index].cmd; |
1493 | meta = &txq->entries[cmd_index].meta; | |
17b88929 | 1494 | |
98891754 | 1495 | iwl_pcie_tfd_unmap(trans, meta, &txq->tfds[index]); |
c33de625 | 1496 | |
17b88929 | 1497 | /* Input error checking is done when commands are added to queue. */ |
c2acea8e | 1498 | if (meta->flags & CMD_WANT_SKB) { |
48a2d66f | 1499 | struct page *p = rxb_steal_page(rxb); |
65b94a4a | 1500 | |
65b94a4a JB |
1501 | meta->source->resp_pkt = pkt; |
1502 | meta->source->_rx_page_addr = (unsigned long)page_address(p); | |
b2cf410c | 1503 | meta->source->_rx_page_order = trans_pcie->rx_page_order; |
247c61d6 | 1504 | meta->source->handler_status = handler_status; |
247c61d6 | 1505 | } |
2624e96c | 1506 | |
f02831be | 1507 | iwl_pcie_cmdq_reclaim(trans, txq_id, index); |
17b88929 | 1508 | |
c2acea8e | 1509 | if (!(meta->flags & CMD_ASYNC)) { |
eb7ff77e | 1510 | if (!test_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status)) { |
05c89b91 WYG |
1511 | IWL_WARN(trans, |
1512 | "HCMD_ACTIVE already clear for command %s\n", | |
990aa6d7 | 1513 | get_cmd_string(trans_pcie, cmd->hdr.cmd)); |
05c89b91 | 1514 | } |
eb7ff77e | 1515 | clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status); |
6d8f6eeb | 1516 | IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n", |
990aa6d7 | 1517 | get_cmd_string(trans_pcie, cmd->hdr.cmd)); |
f946b529 | 1518 | wake_up(&trans_pcie->wait_command_queue); |
17b88929 | 1519 | } |
3598e177 | 1520 | |
dd487449 | 1521 | meta->flags = 0; |
3598e177 | 1522 | |
2bfb5092 | 1523 | spin_unlock_bh(&txq->lock); |
17b88929 | 1524 | } |
253a634c | 1525 | |
9439eac7 | 1526 | #define HOST_COMPLETE_TIMEOUT (2 * HZ) |
253a634c | 1527 | |
f02831be EG |
1528 | static int iwl_pcie_send_hcmd_async(struct iwl_trans *trans, |
1529 | struct iwl_host_cmd *cmd) | |
253a634c | 1530 | { |
d9fb6465 | 1531 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
253a634c EG |
1532 | int ret; |
1533 | ||
1534 | /* An asynchronous command can not expect an SKB to be set. */ | |
1535 | if (WARN_ON(cmd->flags & CMD_WANT_SKB)) | |
1536 | return -EINVAL; | |
1537 | ||
f02831be | 1538 | ret = iwl_pcie_enqueue_hcmd(trans, cmd); |
253a634c | 1539 | if (ret < 0) { |
721c32f7 | 1540 | IWL_ERR(trans, |
b36b110c | 1541 | "Error sending %s: enqueue_hcmd failed: %d\n", |
990aa6d7 | 1542 | get_cmd_string(trans_pcie, cmd->id), ret); |
253a634c EG |
1543 | return ret; |
1544 | } | |
1545 | return 0; | |
1546 | } | |
1547 | ||
f02831be EG |
1548 | static int iwl_pcie_send_hcmd_sync(struct iwl_trans *trans, |
1549 | struct iwl_host_cmd *cmd) | |
253a634c | 1550 | { |
8ad71bef | 1551 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
253a634c EG |
1552 | int cmd_idx; |
1553 | int ret; | |
1554 | ||
6d8f6eeb | 1555 | IWL_DEBUG_INFO(trans, "Attempting to send sync command %s\n", |
990aa6d7 | 1556 | get_cmd_string(trans_pcie, cmd->id)); |
253a634c | 1557 | |
eb7ff77e AN |
1558 | if (WARN(test_and_set_bit(STATUS_SYNC_HCMD_ACTIVE, |
1559 | &trans->status), | |
bcbb8c9c JB |
1560 | "Command %s: a command is already active!\n", |
1561 | get_cmd_string(trans_pcie, cmd->id))) | |
2cc39c94 | 1562 | return -EIO; |
2cc39c94 | 1563 | |
6d8f6eeb | 1564 | IWL_DEBUG_INFO(trans, "Setting HCMD_ACTIVE for command %s\n", |
990aa6d7 | 1565 | get_cmd_string(trans_pcie, cmd->id)); |
253a634c | 1566 | |
f02831be | 1567 | cmd_idx = iwl_pcie_enqueue_hcmd(trans, cmd); |
253a634c EG |
1568 | if (cmd_idx < 0) { |
1569 | ret = cmd_idx; | |
eb7ff77e | 1570 | clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status); |
721c32f7 | 1571 | IWL_ERR(trans, |
b36b110c | 1572 | "Error sending %s: enqueue_hcmd failed: %d\n", |
990aa6d7 | 1573 | get_cmd_string(trans_pcie, cmd->id), ret); |
253a634c EG |
1574 | return ret; |
1575 | } | |
1576 | ||
b9439491 EG |
1577 | ret = wait_event_timeout(trans_pcie->wait_command_queue, |
1578 | !test_bit(STATUS_SYNC_HCMD_ACTIVE, | |
1579 | &trans->status), | |
1580 | HOST_COMPLETE_TIMEOUT); | |
253a634c | 1581 | if (!ret) { |
6dde8c48 JB |
1582 | struct iwl_txq *txq = &trans_pcie->txq[trans_pcie->cmd_queue]; |
1583 | struct iwl_queue *q = &txq->q; | |
d10630af | 1584 | |
6dde8c48 JB |
1585 | IWL_ERR(trans, "Error sending %s: time out after %dms.\n", |
1586 | get_cmd_string(trans_pcie, cmd->id), | |
1587 | jiffies_to_msecs(HOST_COMPLETE_TIMEOUT)); | |
253a634c | 1588 | |
6dde8c48 JB |
1589 | IWL_ERR(trans, "Current CMD queue read_ptr %d write_ptr %d\n", |
1590 | q->read_ptr, q->write_ptr); | |
d10630af | 1591 | |
eb7ff77e | 1592 | clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status); |
6dde8c48 JB |
1593 | IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n", |
1594 | get_cmd_string(trans_pcie, cmd->id)); | |
1595 | ret = -ETIMEDOUT; | |
42550a53 | 1596 | |
4c9706dc | 1597 | iwl_force_nmi(trans); |
2a988e98 | 1598 | iwl_trans_fw_error(trans); |
42550a53 | 1599 | |
6dde8c48 | 1600 | goto cancel; |
253a634c EG |
1601 | } |
1602 | ||
eb7ff77e | 1603 | if (test_bit(STATUS_FW_ERROR, &trans->status)) { |
d18aa87f | 1604 | IWL_ERR(trans, "FW error in SYNC CMD %s\n", |
990aa6d7 | 1605 | get_cmd_string(trans_pcie, cmd->id)); |
b656fa33 | 1606 | dump_stack(); |
d18aa87f JB |
1607 | ret = -EIO; |
1608 | goto cancel; | |
1609 | } | |
1610 | ||
1094fa26 | 1611 | if (!(cmd->flags & CMD_SEND_IN_RFKILL) && |
eb7ff77e | 1612 | test_bit(STATUS_RFKILL, &trans->status)) { |
f946b529 EG |
1613 | IWL_DEBUG_RF_KILL(trans, "RFKILL in SYNC CMD... no rsp\n"); |
1614 | ret = -ERFKILL; | |
1615 | goto cancel; | |
1616 | } | |
1617 | ||
65b94a4a | 1618 | if ((cmd->flags & CMD_WANT_SKB) && !cmd->resp_pkt) { |
6d8f6eeb | 1619 | IWL_ERR(trans, "Error: Response NULL in '%s'\n", |
990aa6d7 | 1620 | get_cmd_string(trans_pcie, cmd->id)); |
253a634c EG |
1621 | ret = -EIO; |
1622 | goto cancel; | |
1623 | } | |
1624 | ||
1625 | return 0; | |
1626 | ||
1627 | cancel: | |
1628 | if (cmd->flags & CMD_WANT_SKB) { | |
1629 | /* | |
1630 | * Cancel the CMD_WANT_SKB flag for the cmd in the | |
1631 | * TX cmd queue. Otherwise in case the cmd comes | |
1632 | * in later, it will possibly set an invalid | |
1633 | * address (cmd->meta.source). | |
1634 | */ | |
bf8440e6 JB |
1635 | trans_pcie->txq[trans_pcie->cmd_queue]. |
1636 | entries[cmd_idx].meta.flags &= ~CMD_WANT_SKB; | |
253a634c | 1637 | } |
9cac4943 | 1638 | |
65b94a4a JB |
1639 | if (cmd->resp_pkt) { |
1640 | iwl_free_resp(cmd); | |
1641 | cmd->resp_pkt = NULL; | |
253a634c EG |
1642 | } |
1643 | ||
1644 | return ret; | |
1645 | } | |
1646 | ||
f02831be | 1647 | int iwl_trans_pcie_send_hcmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd) |
253a634c | 1648 | { |
4f59334b | 1649 | if (!(cmd->flags & CMD_SEND_IN_RFKILL) && |
eb7ff77e | 1650 | test_bit(STATUS_RFKILL, &trans->status)) { |
754d7d9e EG |
1651 | IWL_DEBUG_RF_KILL(trans, "Dropping CMD 0x%x: RF KILL\n", |
1652 | cmd->id); | |
f946b529 | 1653 | return -ERFKILL; |
754d7d9e | 1654 | } |
f946b529 | 1655 | |
253a634c | 1656 | if (cmd->flags & CMD_ASYNC) |
f02831be | 1657 | return iwl_pcie_send_hcmd_async(trans, cmd); |
253a634c | 1658 | |
f946b529 | 1659 | /* We still can fail on RFKILL that can be asserted while we wait */ |
f02831be | 1660 | return iwl_pcie_send_hcmd_sync(trans, cmd); |
253a634c EG |
1661 | } |
1662 | ||
f02831be EG |
1663 | int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb, |
1664 | struct iwl_device_cmd *dev_cmd, int txq_id) | |
a0eaad71 | 1665 | { |
8ad71bef | 1666 | struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
f02831be EG |
1667 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
1668 | struct iwl_tx_cmd *tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload; | |
1669 | struct iwl_cmd_meta *out_meta; | |
1670 | struct iwl_txq *txq; | |
1671 | struct iwl_queue *q; | |
38c0f334 JB |
1672 | dma_addr_t tb0_phys, tb1_phys, scratch_phys; |
1673 | void *tb1_addr; | |
1674 | u16 len, tb1_len, tb2_len; | |
ea68f460 | 1675 | bool wait_write_ptr; |
f02831be EG |
1676 | __le16 fc = hdr->frame_control; |
1677 | u8 hdr_len = ieee80211_hdrlen(fc); | |
68972c46 | 1678 | u16 wifi_seq; |
f02831be EG |
1679 | |
1680 | txq = &trans_pcie->txq[txq_id]; | |
1681 | q = &txq->q; | |
a0eaad71 | 1682 | |
961de6a5 JB |
1683 | if (WARN_ONCE(!test_bit(txq_id, trans_pcie->queue_used), |
1684 | "TX on unused queue %d\n", txq_id)) | |
f02831be | 1685 | return -EINVAL; |
39644e9a | 1686 | |
f02831be | 1687 | spin_lock(&txq->lock); |
015c15e1 | 1688 | |
f02831be EG |
1689 | /* In AGG mode, the index in the ring must correspond to the WiFi |
1690 | * sequence number. This is a HW requirements to help the SCD to parse | |
1691 | * the BA. | |
1692 | * Check here that the packets are in the right place on the ring. | |
1693 | */ | |
9a886586 | 1694 | wifi_seq = IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl)); |
1092b9bc | 1695 | WARN_ONCE(txq->ampdu && |
68972c46 | 1696 | (wifi_seq & 0xff) != q->write_ptr, |
f02831be EG |
1697 | "Q: %d WiFi Seq %d tfdNum %d", |
1698 | txq_id, wifi_seq, q->write_ptr); | |
f02831be EG |
1699 | |
1700 | /* Set up driver data for this TFD */ | |
1701 | txq->entries[q->write_ptr].skb = skb; | |
1702 | txq->entries[q->write_ptr].cmd = dev_cmd; | |
1703 | ||
f02831be EG |
1704 | dev_cmd->hdr.sequence = |
1705 | cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) | | |
1706 | INDEX_TO_SEQ(q->write_ptr))); | |
1707 | ||
38c0f334 JB |
1708 | tb0_phys = iwl_pcie_get_scratchbuf_dma(txq, q->write_ptr); |
1709 | scratch_phys = tb0_phys + sizeof(struct iwl_cmd_header) + | |
1710 | offsetof(struct iwl_tx_cmd, scratch); | |
1711 | ||
1712 | tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys); | |
1713 | tx_cmd->dram_msb_ptr = iwl_get_dma_hi_addr(scratch_phys); | |
1714 | ||
f02831be EG |
1715 | /* Set up first empty entry in queue's array of Tx/cmd buffers */ |
1716 | out_meta = &txq->entries[q->write_ptr].meta; | |
a0eaad71 | 1717 | |
f02831be | 1718 | /* |
38c0f334 JB |
1719 | * The second TB (tb1) points to the remainder of the TX command |
1720 | * and the 802.11 header - dword aligned size | |
1721 | * (This calculation modifies the TX command, so do it before the | |
1722 | * setup of the first TB) | |
f02831be | 1723 | */ |
38c0f334 JB |
1724 | len = sizeof(struct iwl_tx_cmd) + sizeof(struct iwl_cmd_header) + |
1725 | hdr_len - IWL_HCMD_SCRATCHBUF_SIZE; | |
1092b9bc | 1726 | tb1_len = ALIGN(len, 4); |
f02831be EG |
1727 | |
1728 | /* Tell NIC about any 2-byte padding after MAC header */ | |
38c0f334 | 1729 | if (tb1_len != len) |
f02831be EG |
1730 | tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK; |
1731 | ||
38c0f334 JB |
1732 | /* The first TB points to the scratchbuf data - min_copy bytes */ |
1733 | memcpy(&txq->scratchbufs[q->write_ptr], &dev_cmd->hdr, | |
1734 | IWL_HCMD_SCRATCHBUF_SIZE); | |
1735 | iwl_pcie_txq_build_tfd(trans, txq, tb0_phys, | |
6d6e68f8 | 1736 | IWL_HCMD_SCRATCHBUF_SIZE, true); |
f02831be | 1737 | |
38c0f334 JB |
1738 | /* there must be data left over for TB1 or this code must be changed */ |
1739 | BUILD_BUG_ON(sizeof(struct iwl_tx_cmd) < IWL_HCMD_SCRATCHBUF_SIZE); | |
1740 | ||
1741 | /* map the data for TB1 */ | |
1742 | tb1_addr = ((u8 *)&dev_cmd->hdr) + IWL_HCMD_SCRATCHBUF_SIZE; | |
1743 | tb1_phys = dma_map_single(trans->dev, tb1_addr, tb1_len, DMA_TO_DEVICE); | |
1744 | if (unlikely(dma_mapping_error(trans->dev, tb1_phys))) | |
1745 | goto out_err; | |
6d6e68f8 | 1746 | iwl_pcie_txq_build_tfd(trans, txq, tb1_phys, tb1_len, false); |
a0eaad71 | 1747 | |
38c0f334 JB |
1748 | /* |
1749 | * Set up TFD's third entry to point directly to remainder | |
1750 | * of skb, if any (802.11 null frames have no payload). | |
1751 | */ | |
1752 | tb2_len = skb->len - hdr_len; | |
1753 | if (tb2_len > 0) { | |
1754 | dma_addr_t tb2_phys = dma_map_single(trans->dev, | |
1755 | skb->data + hdr_len, | |
1756 | tb2_len, DMA_TO_DEVICE); | |
1757 | if (unlikely(dma_mapping_error(trans->dev, tb2_phys))) { | |
1758 | iwl_pcie_tfd_unmap(trans, out_meta, | |
1759 | &txq->tfds[q->write_ptr]); | |
f02831be EG |
1760 | goto out_err; |
1761 | } | |
6d6e68f8 | 1762 | iwl_pcie_txq_build_tfd(trans, txq, tb2_phys, tb2_len, false); |
f02831be | 1763 | } |
a0eaad71 | 1764 | |
f02831be EG |
1765 | /* Set up entry for this TFD in Tx byte-count array */ |
1766 | iwl_pcie_txq_update_byte_cnt_tbl(trans, txq, le16_to_cpu(tx_cmd->len)); | |
a0eaad71 | 1767 | |
f02831be EG |
1768 | trace_iwlwifi_dev_tx(trans->dev, skb, |
1769 | &txq->tfds[txq->q.write_ptr], | |
1770 | sizeof(struct iwl_tfd), | |
38c0f334 JB |
1771 | &dev_cmd->hdr, IWL_HCMD_SCRATCHBUF_SIZE + tb1_len, |
1772 | skb->data + hdr_len, tb2_len); | |
f02831be | 1773 | trace_iwlwifi_dev_tx_data(trans->dev, skb, |
38c0f334 JB |
1774 | skb->data + hdr_len, tb2_len); |
1775 | ||
ea68f460 | 1776 | wait_write_ptr = ieee80211_has_morefrags(fc); |
7c5ba4a8 | 1777 | |
f02831be EG |
1778 | /* start timer if queue currently empty */ |
1779 | if (txq->need_update && q->read_ptr == q->write_ptr && | |
1780 | trans_pcie->wd_timeout) | |
1781 | mod_timer(&txq->stuck_timer, jiffies + trans_pcie->wd_timeout); | |
1782 | ||
1783 | /* Tell device the write index *just past* this latest filled TFD */ | |
83f32a4b | 1784 | q->write_ptr = iwl_queue_inc_wrap(q->write_ptr); |
ea68f460 JB |
1785 | if (!wait_write_ptr) |
1786 | iwl_pcie_txq_inc_wr_ptr(trans, txq); | |
f02831be EG |
1787 | |
1788 | /* | |
1789 | * At this point the frame is "transmitted" successfully | |
43aa616f | 1790 | * and we will get a TX status notification eventually. |
f02831be EG |
1791 | */ |
1792 | if (iwl_queue_space(q) < q->high_mark) { | |
ea68f460 | 1793 | if (wait_write_ptr) |
f02831be | 1794 | iwl_pcie_txq_inc_wr_ptr(trans, txq); |
ea68f460 | 1795 | else |
f02831be | 1796 | iwl_stop_queue(trans, txq); |
f02831be EG |
1797 | } |
1798 | spin_unlock(&txq->lock); | |
1799 | return 0; | |
1800 | out_err: | |
1801 | spin_unlock(&txq->lock); | |
1802 | return -1; | |
a0eaad71 | 1803 | } |