1 /******************************************************************************
3 * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
4 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
6 * Portions of this file are derived from the ipw3945 project, as well
7 * as portions of the ieee80211 subsystem header files.
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
18 * You should have received a copy of the GNU General Public License along with
19 * this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
22 * The full GNU General Public License is included in this distribution in the
23 * file called LICENSE.
25 * Contact Information:
26 * Intel Linux Wireless <ilw@linux.intel.com>
27 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
29 *****************************************************************************/
30 #include <linux/etherdevice.h>
31 #include <linux/slab.h>
32 #include <linux/sched.h>
34 #include "iwl-debug.h"
39 #include "iwl-op-mode.h"
41 /* FIXME: need to abstract out TX command (once we know what it looks like) */
42 #include "dvm/commands.h"
44 #define IWL_TX_CRC_SIZE 4
45 #define IWL_TX_DELIMITER_SIZE 4
47 /*************** DMA-QUEUE-GENERAL-FUNCTIONS *****
52 * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
53 * of buffer descriptors, each of which points to one or more data buffers for
54 * the device to read from or fill. Driver and device exchange status of each
55 * queue via "read" and "write" pointers. Driver keeps minimum of 2 empty
56 * entries in each circular buffer, to protect against confusing empty and full
59 * The device reads or writes the data in the queues via the device's several
60 * DMA/FIFO channels. Each queue is mapped to a single DMA channel.
62 * For Tx queue, there are low mark and high mark limits. If, after queuing
63 * the packet for Tx, free space become < low mark, Tx queue stopped. When
64 * reclaiming packets (on 'tx done IRQ), if free space become > high mark,
67 ***************************************************/
68 static int iwl_queue_space(const struct iwl_queue *q)
74 * To avoid ambiguity between empty and completely full queues, there
75 * should always be less than TFD_QUEUE_SIZE_MAX elements in the queue.
76 * If q->n_window is smaller than TFD_QUEUE_SIZE_MAX, there is no need
77 * to reserve any queue entries for this purpose.
79 if (q->n_window < TFD_QUEUE_SIZE_MAX)
82 max = TFD_QUEUE_SIZE_MAX - 1;
85 * TFD_QUEUE_SIZE_MAX is a power of 2, so the following is equivalent to
86 * modulo by TFD_QUEUE_SIZE_MAX and is well defined.
88 used = (q->write_ptr - q->read_ptr) & (TFD_QUEUE_SIZE_MAX - 1);
90 if (WARN_ON(used > max))
97 * iwl_queue_init - Initialize queue's high/low-water and read/write indexes
99 static int iwl_queue_init(struct iwl_queue *q, int slots_num, u32 id)
101 q->n_window = slots_num;
104 /* slots_num must be power-of-two size, otherwise
105 * get_cmd_index is broken. */
106 if (WARN_ON(!is_power_of_2(slots_num)))
109 q->low_mark = q->n_window / 4;
113 q->high_mark = q->n_window / 8;
114 if (q->high_mark < 2)
123 static int iwl_pcie_alloc_dma_ptr(struct iwl_trans *trans,
124 struct iwl_dma_ptr *ptr, size_t size)
126 if (WARN_ON(ptr->addr))
129 ptr->addr = dma_alloc_coherent(trans->dev, size,
130 &ptr->dma, GFP_KERNEL);
137 static void iwl_pcie_free_dma_ptr(struct iwl_trans *trans,
138 struct iwl_dma_ptr *ptr)
140 if (unlikely(!ptr->addr))
143 dma_free_coherent(trans->dev, ptr->size, ptr->addr, ptr->dma);
144 memset(ptr, 0, sizeof(*ptr));
147 static void iwl_pcie_txq_stuck_timer(unsigned long data)
149 struct iwl_txq *txq = (void *)data;
150 struct iwl_queue *q = &txq->q;
151 struct iwl_trans_pcie *trans_pcie = txq->trans_pcie;
152 struct iwl_trans *trans = iwl_trans_pcie_get_trans(trans_pcie);
153 u32 scd_sram_addr = trans_pcie->scd_base_addr +
154 SCD_TX_STTS_QUEUE_OFFSET(txq->q.id);
158 spin_lock(&txq->lock);
159 /* check if triggered erroneously */
160 if (txq->q.read_ptr == txq->q.write_ptr) {
161 spin_unlock(&txq->lock);
164 spin_unlock(&txq->lock);
166 IWL_ERR(trans, "Queue %d stuck for %u ms.\n", txq->q.id,
167 jiffies_to_msecs(trans_pcie->wd_timeout));
168 IWL_ERR(trans, "Current SW read_ptr %d write_ptr %d\n",
169 txq->q.read_ptr, txq->q.write_ptr);
171 iwl_trans_read_mem_bytes(trans, scd_sram_addr, buf, sizeof(buf));
173 iwl_print_hex_error(trans, buf, sizeof(buf));
175 for (i = 0; i < FH_TCSR_CHNL_NUM; i++)
176 IWL_ERR(trans, "FH TRBs(%d) = 0x%08x\n", i,
177 iwl_read_direct32(trans, FH_TX_TRB_REG(i)));
179 for (i = 0; i < trans->cfg->base_params->num_of_queues; i++) {
180 u32 status = iwl_read_prph(trans, SCD_QUEUE_STATUS_BITS(i));
181 u8 fifo = (status >> SCD_QUEUE_STTS_REG_POS_TXF) & 0x7;
182 bool active = !!(status & BIT(SCD_QUEUE_STTS_REG_POS_ACTIVE));
184 iwl_trans_read_mem32(trans,
185 trans_pcie->scd_base_addr +
186 SCD_TRANS_TBL_OFFSET_QUEUE(i));
189 tbl_dw = (tbl_dw & 0xFFFF0000) >> 16;
191 tbl_dw = tbl_dw & 0x0000FFFF;
194 "Q %d is %sactive and mapped to fifo %d ra_tid 0x%04x [%d,%d]\n",
195 i, active ? "" : "in", fifo, tbl_dw,
196 iwl_read_prph(trans, SCD_QUEUE_RDPTR(i)) &
197 (TFD_QUEUE_SIZE_MAX - 1),
198 iwl_read_prph(trans, SCD_QUEUE_WRPTR(i)));
201 for (i = q->read_ptr; i != q->write_ptr;
202 i = iwl_queue_inc_wrap(i))
203 IWL_ERR(trans, "scratch %d = 0x%08x\n", i,
204 le32_to_cpu(txq->scratchbufs[i].scratch));
206 iwl_force_nmi(trans);
210 * iwl_pcie_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array
212 static void iwl_pcie_txq_update_byte_cnt_tbl(struct iwl_trans *trans,
213 struct iwl_txq *txq, u16 byte_cnt)
215 struct iwlagn_scd_bc_tbl *scd_bc_tbl;
216 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
217 int write_ptr = txq->q.write_ptr;
218 int txq_id = txq->q.id;
221 u16 len = byte_cnt + IWL_TX_CRC_SIZE + IWL_TX_DELIMITER_SIZE;
223 struct iwl_tx_cmd *tx_cmd =
224 (void *) txq->entries[txq->q.write_ptr].cmd->payload;
226 scd_bc_tbl = trans_pcie->scd_bc_tbls.addr;
228 WARN_ON(len > 0xFFF || write_ptr >= TFD_QUEUE_SIZE_MAX);
230 sta_id = tx_cmd->sta_id;
231 sec_ctl = tx_cmd->sec_ctl;
233 switch (sec_ctl & TX_CMD_SEC_MSK) {
235 len += IEEE80211_CCMP_MIC_LEN;
237 case TX_CMD_SEC_TKIP:
238 len += IEEE80211_TKIP_ICV_LEN;
241 len += IEEE80211_WEP_IV_LEN + IEEE80211_WEP_ICV_LEN;
245 if (trans_pcie->bc_table_dword)
246 len = DIV_ROUND_UP(len, 4);
248 bc_ent = cpu_to_le16(len | (sta_id << 12));
250 scd_bc_tbl[txq_id].tfd_offset[write_ptr] = bc_ent;
252 if (write_ptr < TFD_QUEUE_SIZE_BC_DUP)
254 tfd_offset[TFD_QUEUE_SIZE_MAX + write_ptr] = bc_ent;
257 static void iwl_pcie_txq_inval_byte_cnt_tbl(struct iwl_trans *trans,
260 struct iwl_trans_pcie *trans_pcie =
261 IWL_TRANS_GET_PCIE_TRANS(trans);
262 struct iwlagn_scd_bc_tbl *scd_bc_tbl = trans_pcie->scd_bc_tbls.addr;
263 int txq_id = txq->q.id;
264 int read_ptr = txq->q.read_ptr;
267 struct iwl_tx_cmd *tx_cmd =
268 (void *)txq->entries[txq->q.read_ptr].cmd->payload;
270 WARN_ON(read_ptr >= TFD_QUEUE_SIZE_MAX);
272 if (txq_id != trans_pcie->cmd_queue)
273 sta_id = tx_cmd->sta_id;
275 bc_ent = cpu_to_le16(1 | (sta_id << 12));
276 scd_bc_tbl[txq_id].tfd_offset[read_ptr] = bc_ent;
278 if (read_ptr < TFD_QUEUE_SIZE_BC_DUP)
280 tfd_offset[TFD_QUEUE_SIZE_MAX + read_ptr] = bc_ent;
284 * iwl_pcie_txq_inc_wr_ptr - Send new write index to hardware
286 static void iwl_pcie_txq_inc_wr_ptr(struct iwl_trans *trans,
289 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
291 int txq_id = txq->q.id;
293 lockdep_assert_held(&txq->lock);
296 * explicitly wake up the NIC if:
297 * 1. shadow registers aren't enabled
298 * 2. NIC is woken up for CMD regardless of shadow outside this function
299 * 3. there is a chance that the NIC is asleep
301 if (!trans->cfg->base_params->shadow_reg_enable &&
302 txq_id != trans_pcie->cmd_queue &&
303 test_bit(STATUS_TPOWER_PMI, &trans->status)) {
305 * wake up nic if it's powered down ...
306 * uCode will wake up, and interrupt us again, so next
307 * time we'll skip this part.
309 reg = iwl_read32(trans, CSR_UCODE_DRV_GP1);
311 if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
312 IWL_DEBUG_INFO(trans, "Tx queue %d requesting wakeup, GP1 = 0x%x\n",
314 iwl_set_bit(trans, CSR_GP_CNTRL,
315 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
316 txq->need_update = true;
322 * if not in power-save mode, uCode will never sleep when we're
323 * trying to tx (during RFKILL, we're not trying to tx).
325 IWL_DEBUG_TX(trans, "Q:%d WR: 0x%x\n", txq_id, txq->q.write_ptr);
326 iwl_write32(trans, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8));
329 void iwl_pcie_txq_check_wrptrs(struct iwl_trans *trans)
331 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
334 for (i = 0; i < trans->cfg->base_params->num_of_queues; i++) {
335 struct iwl_txq *txq = &trans_pcie->txq[i];
337 spin_lock_bh(&txq->lock);
338 if (trans_pcie->txq[i].need_update) {
339 iwl_pcie_txq_inc_wr_ptr(trans, txq);
340 trans_pcie->txq[i].need_update = false;
342 spin_unlock_bh(&txq->lock);
346 static inline dma_addr_t iwl_pcie_tfd_tb_get_addr(struct iwl_tfd *tfd, u8 idx)
348 struct iwl_tfd_tb *tb = &tfd->tbs[idx];
350 dma_addr_t addr = get_unaligned_le32(&tb->lo);
351 if (sizeof(dma_addr_t) > sizeof(u32))
353 ((dma_addr_t)(le16_to_cpu(tb->hi_n_len) & 0xF) << 16) << 16;
358 static inline void iwl_pcie_tfd_set_tb(struct iwl_tfd *tfd, u8 idx,
359 dma_addr_t addr, u16 len)
361 struct iwl_tfd_tb *tb = &tfd->tbs[idx];
362 u16 hi_n_len = len << 4;
364 put_unaligned_le32(addr, &tb->lo);
365 if (sizeof(dma_addr_t) > sizeof(u32))
366 hi_n_len |= ((addr >> 16) >> 16) & 0xF;
368 tb->hi_n_len = cpu_to_le16(hi_n_len);
370 tfd->num_tbs = idx + 1;
373 static inline u8 iwl_pcie_tfd_get_num_tbs(struct iwl_tfd *tfd)
375 return tfd->num_tbs & 0x1f;
378 static void iwl_pcie_tfd_unmap(struct iwl_trans *trans,
379 struct iwl_cmd_meta *meta,
385 /* Sanity check on number of chunks */
386 num_tbs = iwl_pcie_tfd_get_num_tbs(tfd);
388 if (num_tbs >= IWL_NUM_OF_TBS) {
389 IWL_ERR(trans, "Too many chunks: %i\n", num_tbs);
390 /* @todo issue fatal error, it is quite serious situation */
394 /* first TB is never freed - it's the scratchbuf data */
396 for (i = 1; i < num_tbs; i++)
397 dma_unmap_single(trans->dev, iwl_pcie_tfd_tb_get_addr(tfd, i),
398 iwl_pcie_tfd_tb_get_len(tfd, i),
405 * iwl_pcie_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr]
406 * @trans - transport private data
408 * @dma_dir - the direction of the DMA mapping
410 * Does NOT advance any TFD circular buffer read/write indexes
411 * Does NOT free the TFD itself (which is within circular buffer)
413 static void iwl_pcie_txq_free_tfd(struct iwl_trans *trans, struct iwl_txq *txq)
415 struct iwl_tfd *tfd_tmp = txq->tfds;
417 /* rd_ptr is bounded by TFD_QUEUE_SIZE_MAX and
418 * idx is bounded by n_window
420 int rd_ptr = txq->q.read_ptr;
421 int idx = get_cmd_index(&txq->q, rd_ptr);
423 lockdep_assert_held(&txq->lock);
425 /* We have only q->n_window txq->entries, but we use
426 * TFD_QUEUE_SIZE_MAX tfds
428 iwl_pcie_tfd_unmap(trans, &txq->entries[idx].meta, &tfd_tmp[rd_ptr]);
434 skb = txq->entries[idx].skb;
436 /* Can be called from irqs-disabled context
437 * If skb is not NULL, it means that the whole queue is being
438 * freed and that the queue is not empty - free the skb
441 iwl_op_mode_free_skb(trans->op_mode, skb);
442 txq->entries[idx].skb = NULL;
447 static int iwl_pcie_txq_build_tfd(struct iwl_trans *trans, struct iwl_txq *txq,
448 dma_addr_t addr, u16 len, bool reset)
451 struct iwl_tfd *tfd, *tfd_tmp;
456 tfd = &tfd_tmp[q->write_ptr];
459 memset(tfd, 0, sizeof(*tfd));
461 num_tbs = iwl_pcie_tfd_get_num_tbs(tfd);
463 /* Each TFD can point to a maximum 20 Tx buffers */
464 if (num_tbs >= IWL_NUM_OF_TBS) {
465 IWL_ERR(trans, "Error can not send more than %d chunks\n",
470 if (WARN(addr & ~IWL_TX_DMA_MASK,
471 "Unaligned address = %llx\n", (unsigned long long)addr))
474 iwl_pcie_tfd_set_tb(tfd, num_tbs, addr, len);
479 static int iwl_pcie_txq_alloc(struct iwl_trans *trans,
480 struct iwl_txq *txq, int slots_num,
483 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
484 size_t tfd_sz = sizeof(struct iwl_tfd) * TFD_QUEUE_SIZE_MAX;
485 size_t scratchbuf_sz;
488 if (WARN_ON(txq->entries || txq->tfds))
491 setup_timer(&txq->stuck_timer, iwl_pcie_txq_stuck_timer,
493 txq->trans_pcie = trans_pcie;
495 txq->q.n_window = slots_num;
497 txq->entries = kcalloc(slots_num,
498 sizeof(struct iwl_pcie_txq_entry),
504 if (txq_id == trans_pcie->cmd_queue)
505 for (i = 0; i < slots_num; i++) {
506 txq->entries[i].cmd =
507 kmalloc(sizeof(struct iwl_device_cmd),
509 if (!txq->entries[i].cmd)
513 /* Circular buffer of transmit frame descriptors (TFDs),
514 * shared with device */
515 txq->tfds = dma_alloc_coherent(trans->dev, tfd_sz,
516 &txq->q.dma_addr, GFP_KERNEL);
520 BUILD_BUG_ON(IWL_HCMD_SCRATCHBUF_SIZE != sizeof(*txq->scratchbufs));
521 BUILD_BUG_ON(offsetof(struct iwl_pcie_txq_scratch_buf, scratch) !=
522 sizeof(struct iwl_cmd_header) +
523 offsetof(struct iwl_tx_cmd, scratch));
525 scratchbuf_sz = sizeof(*txq->scratchbufs) * slots_num;
527 txq->scratchbufs = dma_alloc_coherent(trans->dev, scratchbuf_sz,
528 &txq->scratchbufs_dma,
530 if (!txq->scratchbufs)
537 dma_free_coherent(trans->dev, tfd_sz, txq->tfds, txq->q.dma_addr);
539 if (txq->entries && txq_id == trans_pcie->cmd_queue)
540 for (i = 0; i < slots_num; i++)
541 kfree(txq->entries[i].cmd);
549 static int iwl_pcie_txq_init(struct iwl_trans *trans, struct iwl_txq *txq,
550 int slots_num, u32 txq_id)
554 txq->need_update = false;
556 /* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
557 * iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */
558 BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
560 /* Initialize queue's high/low-water marks, and head/tail indexes */
561 ret = iwl_queue_init(&txq->q, slots_num, txq_id);
565 spin_lock_init(&txq->lock);
568 * Tell nic where to find circular buffer of Tx Frame Descriptors for
569 * given Tx queue, and enable the DMA channel used for that queue.
570 * Circular buffer (TFD queue in DRAM) physical base address */
571 iwl_write_direct32(trans, FH_MEM_CBBC_QUEUE(txq_id),
572 txq->q.dma_addr >> 8);
578 * iwl_pcie_txq_unmap - Unmap any remaining DMA mappings and free skb's
580 static void iwl_pcie_txq_unmap(struct iwl_trans *trans, int txq_id)
582 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
583 struct iwl_txq *txq = &trans_pcie->txq[txq_id];
584 struct iwl_queue *q = &txq->q;
586 spin_lock_bh(&txq->lock);
587 while (q->write_ptr != q->read_ptr) {
588 IWL_DEBUG_TX_REPLY(trans, "Q %d Free %d\n",
589 txq_id, q->read_ptr);
590 iwl_pcie_txq_free_tfd(trans, txq);
591 q->read_ptr = iwl_queue_inc_wrap(q->read_ptr);
594 spin_unlock_bh(&txq->lock);
596 /* just in case - this queue may have been stopped */
597 iwl_wake_queue(trans, txq);
601 * iwl_pcie_txq_free - Deallocate DMA queue.
602 * @txq: Transmit queue to deallocate.
604 * Empty queue by removing and destroying all BD's.
606 * 0-fill, but do not free "txq" descriptor structure.
608 static void iwl_pcie_txq_free(struct iwl_trans *trans, int txq_id)
610 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
611 struct iwl_txq *txq = &trans_pcie->txq[txq_id];
612 struct device *dev = trans->dev;
618 iwl_pcie_txq_unmap(trans, txq_id);
620 /* De-alloc array of command/tx buffers */
621 if (txq_id == trans_pcie->cmd_queue)
622 for (i = 0; i < txq->q.n_window; i++) {
623 kzfree(txq->entries[i].cmd);
624 kzfree(txq->entries[i].free_buf);
627 /* De-alloc circular buffer of TFDs */
629 dma_free_coherent(dev,
630 sizeof(struct iwl_tfd) * TFD_QUEUE_SIZE_MAX,
631 txq->tfds, txq->q.dma_addr);
635 dma_free_coherent(dev,
636 sizeof(*txq->scratchbufs) * txq->q.n_window,
637 txq->scratchbufs, txq->scratchbufs_dma);
643 del_timer_sync(&txq->stuck_timer);
645 /* 0-fill queue descriptor structure */
646 memset(txq, 0, sizeof(*txq));
649 void iwl_pcie_tx_start(struct iwl_trans *trans, u32 scd_base_addr)
651 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
652 int nq = trans->cfg->base_params->num_of_queues;
655 int clear_dwords = (SCD_TRANS_TBL_OFFSET_QUEUE(nq) -
656 SCD_CONTEXT_MEM_LOWER_BOUND) / sizeof(u32);
658 /* make sure all queue are not stopped/used */
659 memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped));
660 memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
662 trans_pcie->scd_base_addr =
663 iwl_read_prph(trans, SCD_SRAM_BASE_ADDR);
665 WARN_ON(scd_base_addr != 0 &&
666 scd_base_addr != trans_pcie->scd_base_addr);
668 /* reset context data, TX status and translation data */
669 iwl_trans_write_mem(trans, trans_pcie->scd_base_addr +
670 SCD_CONTEXT_MEM_LOWER_BOUND,
673 iwl_write_prph(trans, SCD_DRAM_BASE_ADDR,
674 trans_pcie->scd_bc_tbls.dma >> 10);
676 /* The chain extension of the SCD doesn't work well. This feature is
677 * enabled by default by the HW, so we need to disable it manually.
679 if (trans->cfg->base_params->scd_chain_ext_wa)
680 iwl_write_prph(trans, SCD_CHAINEXT_EN, 0);
682 iwl_trans_ac_txq_enable(trans, trans_pcie->cmd_queue,
683 trans_pcie->cmd_fifo);
685 /* Activate all Tx DMA/FIFO channels */
686 iwl_scd_activate_fifos(trans);
688 /* Enable DMA channel */
689 for (chan = 0; chan < FH_TCSR_CHNL_NUM; chan++)
690 iwl_write_direct32(trans, FH_TCSR_CHNL_TX_CONFIG_REG(chan),
691 FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
692 FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE);
694 /* Update FH chicken bits */
695 reg_val = iwl_read_direct32(trans, FH_TX_CHICKEN_BITS_REG);
696 iwl_write_direct32(trans, FH_TX_CHICKEN_BITS_REG,
697 reg_val | FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN);
699 /* Enable L1-Active */
700 if (trans->cfg->device_family != IWL_DEVICE_FAMILY_8000)
701 iwl_clear_bits_prph(trans, APMG_PCIDEV_STT_REG,
702 APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
705 void iwl_trans_pcie_tx_reset(struct iwl_trans *trans)
707 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
710 for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
712 struct iwl_txq *txq = &trans_pcie->txq[txq_id];
714 iwl_write_direct32(trans, FH_MEM_CBBC_QUEUE(txq_id),
715 txq->q.dma_addr >> 8);
716 iwl_pcie_txq_unmap(trans, txq_id);
718 txq->q.write_ptr = 0;
721 /* Tell NIC where to find the "keep warm" buffer */
722 iwl_write_direct32(trans, FH_KW_MEM_ADDR_REG,
723 trans_pcie->kw.dma >> 4);
725 iwl_pcie_tx_start(trans, trans_pcie->scd_base_addr);
729 * iwl_pcie_tx_stop - Stop all Tx DMA channels
731 int iwl_pcie_tx_stop(struct iwl_trans *trans)
733 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
736 /* Turn off all Tx DMA fifos */
737 spin_lock(&trans_pcie->irq_lock);
739 iwl_scd_deactivate_fifos(trans);
741 /* Stop each Tx DMA channel, and wait for it to be idle */
742 for (ch = 0; ch < FH_TCSR_CHNL_NUM; ch++) {
743 iwl_write_direct32(trans,
744 FH_TCSR_CHNL_TX_CONFIG_REG(ch), 0x0);
745 ret = iwl_poll_direct_bit(trans, FH_TSSR_TX_STATUS_REG,
746 FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch), 1000);
749 "Failing on timeout while stopping DMA channel %d [0x%08x]\n",
751 iwl_read_direct32(trans,
752 FH_TSSR_TX_STATUS_REG));
754 spin_unlock(&trans_pcie->irq_lock);
757 * This function can be called before the op_mode disabled the
758 * queues. This happens when we have an rfkill interrupt.
759 * Since we stop Tx altogether - mark the queues as stopped.
761 memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped));
762 memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
764 /* This can happen: start_hw, stop_device */
765 if (!trans_pcie->txq)
768 /* Unmap DMA from host system and free skb's */
769 for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
771 iwl_pcie_txq_unmap(trans, txq_id);
777 * iwl_trans_tx_free - Free TXQ Context
779 * Destroy all TX DMA queues and structures
781 void iwl_pcie_tx_free(struct iwl_trans *trans)
784 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
787 if (trans_pcie->txq) {
789 txq_id < trans->cfg->base_params->num_of_queues; txq_id++)
790 iwl_pcie_txq_free(trans, txq_id);
793 kfree(trans_pcie->txq);
794 trans_pcie->txq = NULL;
796 iwl_pcie_free_dma_ptr(trans, &trans_pcie->kw);
798 iwl_pcie_free_dma_ptr(trans, &trans_pcie->scd_bc_tbls);
802 * iwl_pcie_tx_alloc - allocate TX context
803 * Allocate all Tx DMA structures and initialize them
805 static int iwl_pcie_tx_alloc(struct iwl_trans *trans)
808 int txq_id, slots_num;
809 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
811 u16 scd_bc_tbls_size = trans->cfg->base_params->num_of_queues *
812 sizeof(struct iwlagn_scd_bc_tbl);
814 /*It is not allowed to alloc twice, so warn when this happens.
815 * We cannot rely on the previous allocation, so free and fail */
816 if (WARN_ON(trans_pcie->txq)) {
821 ret = iwl_pcie_alloc_dma_ptr(trans, &trans_pcie->scd_bc_tbls,
824 IWL_ERR(trans, "Scheduler BC Table allocation failed\n");
828 /* Alloc keep-warm buffer */
829 ret = iwl_pcie_alloc_dma_ptr(trans, &trans_pcie->kw, IWL_KW_SIZE);
831 IWL_ERR(trans, "Keep Warm allocation failed\n");
835 trans_pcie->txq = kcalloc(trans->cfg->base_params->num_of_queues,
836 sizeof(struct iwl_txq), GFP_KERNEL);
837 if (!trans_pcie->txq) {
838 IWL_ERR(trans, "Not enough memory for txq\n");
843 /* Alloc and init all Tx queues, including the command queue (#4/#9) */
844 for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
846 slots_num = (txq_id == trans_pcie->cmd_queue) ?
847 TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
848 ret = iwl_pcie_txq_alloc(trans, &trans_pcie->txq[txq_id],
851 IWL_ERR(trans, "Tx %d queue alloc failed\n", txq_id);
859 iwl_pcie_tx_free(trans);
863 int iwl_pcie_tx_init(struct iwl_trans *trans)
865 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
867 int txq_id, slots_num;
870 if (!trans_pcie->txq) {
871 ret = iwl_pcie_tx_alloc(trans);
877 spin_lock(&trans_pcie->irq_lock);
879 /* Turn off all Tx DMA fifos */
880 iwl_scd_deactivate_fifos(trans);
882 /* Tell NIC where to find the "keep warm" buffer */
883 iwl_write_direct32(trans, FH_KW_MEM_ADDR_REG,
884 trans_pcie->kw.dma >> 4);
886 spin_unlock(&trans_pcie->irq_lock);
888 /* Alloc and init all Tx queues, including the command queue (#4/#9) */
889 for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
891 slots_num = (txq_id == trans_pcie->cmd_queue) ?
892 TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
893 ret = iwl_pcie_txq_init(trans, &trans_pcie->txq[txq_id],
896 IWL_ERR(trans, "Tx %d queue init failed\n", txq_id);
903 /*Upon error, free only if we allocated something */
905 iwl_pcie_tx_free(trans);
909 static inline void iwl_pcie_txq_progress(struct iwl_trans_pcie *trans_pcie,
912 if (!trans_pcie->wd_timeout)
916 * if empty delete timer, otherwise move timer forward
917 * since we're making progress on this queue
919 if (txq->q.read_ptr == txq->q.write_ptr)
920 del_timer(&txq->stuck_timer);
922 mod_timer(&txq->stuck_timer, jiffies + trans_pcie->wd_timeout);
925 /* Frees buffers until index _not_ inclusive */
926 void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn,
927 struct sk_buff_head *skbs)
929 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
930 struct iwl_txq *txq = &trans_pcie->txq[txq_id];
931 int tfd_num = ssn & (TFD_QUEUE_SIZE_MAX - 1);
932 struct iwl_queue *q = &txq->q;
935 /* This function is not meant to release cmd queue*/
936 if (WARN_ON(txq_id == trans_pcie->cmd_queue))
939 spin_lock_bh(&txq->lock);
942 IWL_DEBUG_TX_QUEUES(trans, "Q %d inactive - ignoring idx %d\n",
947 if (txq->q.read_ptr == tfd_num)
950 IWL_DEBUG_TX_REPLY(trans, "[Q %d] %d -> %d (%d)\n",
951 txq_id, txq->q.read_ptr, tfd_num, ssn);
953 /*Since we free until index _not_ inclusive, the one before index is
954 * the last we will free. This one must be used */
955 last_to_free = iwl_queue_dec_wrap(tfd_num);
957 if (!iwl_queue_used(q, last_to_free)) {
959 "%s: Read index for DMA queue txq id (%d), last_to_free %d is out of range [0-%d] %d %d.\n",
960 __func__, txq_id, last_to_free, TFD_QUEUE_SIZE_MAX,
961 q->write_ptr, q->read_ptr);
965 if (WARN_ON(!skb_queue_empty(skbs)))
969 q->read_ptr != tfd_num;
970 q->read_ptr = iwl_queue_inc_wrap(q->read_ptr)) {
972 if (WARN_ON_ONCE(txq->entries[txq->q.read_ptr].skb == NULL))
975 __skb_queue_tail(skbs, txq->entries[txq->q.read_ptr].skb);
977 txq->entries[txq->q.read_ptr].skb = NULL;
979 iwl_pcie_txq_inval_byte_cnt_tbl(trans, txq);
981 iwl_pcie_txq_free_tfd(trans, txq);
984 iwl_pcie_txq_progress(trans_pcie, txq);
986 if (iwl_queue_space(&txq->q) > txq->q.low_mark)
987 iwl_wake_queue(trans, txq);
989 if (q->read_ptr == q->write_ptr) {
990 IWL_DEBUG_RPM(trans, "Q %d - last tx reclaimed\n", q->id);
991 iwl_trans_pcie_unref(trans);
995 spin_unlock_bh(&txq->lock);
998 static int iwl_pcie_set_cmd_in_flight(struct iwl_trans *trans,
999 const struct iwl_host_cmd *cmd)
1001 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1004 lockdep_assert_held(&trans_pcie->reg_lock);
1006 if (!(cmd->flags & CMD_SEND_IN_IDLE) &&
1007 !trans_pcie->ref_cmd_in_flight) {
1008 trans_pcie->ref_cmd_in_flight = true;
1009 IWL_DEBUG_RPM(trans, "set ref_cmd_in_flight - ref\n");
1010 iwl_trans_pcie_ref(trans);
1013 if (trans_pcie->cmd_in_flight)
1016 trans_pcie->cmd_in_flight = true;
1019 * wake up the NIC to make sure that the firmware will see the host
1020 * command - we will let the NIC sleep once all the host commands
1021 * returned. This needs to be done only on NICs that have
1022 * apmg_wake_up_wa set.
1024 if (trans->cfg->base_params->apmg_wake_up_wa) {
1025 __iwl_trans_pcie_set_bit(trans, CSR_GP_CNTRL,
1026 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
1027 if (trans->cfg->device_family == IWL_DEVICE_FAMILY_8000)
1030 ret = iwl_poll_bit(trans, CSR_GP_CNTRL,
1031 CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
1032 (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
1033 CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP),
1036 __iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
1037 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
1038 trans_pcie->cmd_in_flight = false;
1039 IWL_ERR(trans, "Failed to wake NIC for hcmd\n");
1047 static int iwl_pcie_clear_cmd_in_flight(struct iwl_trans *trans)
1049 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1051 lockdep_assert_held(&trans_pcie->reg_lock);
1053 if (trans_pcie->ref_cmd_in_flight) {
1054 trans_pcie->ref_cmd_in_flight = false;
1055 IWL_DEBUG_RPM(trans, "clear ref_cmd_in_flight - unref\n");
1056 iwl_trans_pcie_unref(trans);
1059 if (WARN_ON(!trans_pcie->cmd_in_flight))
1062 trans_pcie->cmd_in_flight = false;
1064 if (trans->cfg->base_params->apmg_wake_up_wa)
1065 __iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
1066 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
1072 * iwl_pcie_cmdq_reclaim - Reclaim TX command queue entries already Tx'd
1074 * When FW advances 'R' index, all entries between old and new 'R' index
1075 * need to be reclaimed. As result, some free space forms. If there is
1076 * enough free space (> low mark), wake the stack that feeds us.
1078 static void iwl_pcie_cmdq_reclaim(struct iwl_trans *trans, int txq_id, int idx)
1080 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1081 struct iwl_txq *txq = &trans_pcie->txq[txq_id];
1082 struct iwl_queue *q = &txq->q;
1083 unsigned long flags;
1086 lockdep_assert_held(&txq->lock);
1088 if ((idx >= TFD_QUEUE_SIZE_MAX) || (!iwl_queue_used(q, idx))) {
1090 "%s: Read index for DMA queue txq id (%d), index %d is out of range [0-%d] %d %d.\n",
1091 __func__, txq_id, idx, TFD_QUEUE_SIZE_MAX,
1092 q->write_ptr, q->read_ptr);
1096 for (idx = iwl_queue_inc_wrap(idx); q->read_ptr != idx;
1097 q->read_ptr = iwl_queue_inc_wrap(q->read_ptr)) {
1100 IWL_ERR(trans, "HCMD skipped: index (%d) %d %d\n",
1101 idx, q->write_ptr, q->read_ptr);
1102 iwl_force_nmi(trans);
1106 if (q->read_ptr == q->write_ptr) {
1107 spin_lock_irqsave(&trans_pcie->reg_lock, flags);
1108 iwl_pcie_clear_cmd_in_flight(trans);
1109 spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
1112 iwl_pcie_txq_progress(trans_pcie, txq);
1115 static int iwl_pcie_txq_set_ratid_map(struct iwl_trans *trans, u16 ra_tid,
1118 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1123 scd_q2ratid = ra_tid & SCD_QUEUE_RA_TID_MAP_RATID_MSK;
1125 tbl_dw_addr = trans_pcie->scd_base_addr +
1126 SCD_TRANS_TBL_OFFSET_QUEUE(txq_id);
1128 tbl_dw = iwl_trans_read_mem32(trans, tbl_dw_addr);
1131 tbl_dw = (scd_q2ratid << 16) | (tbl_dw & 0x0000FFFF);
1133 tbl_dw = scd_q2ratid | (tbl_dw & 0xFFFF0000);
1135 iwl_trans_write_mem32(trans, tbl_dw_addr, tbl_dw);
1140 /* Receiver address (actually, Rx station's index into station table),
1141 * combined with Traffic ID (QOS priority), in format used by Tx Scheduler */
1142 #define BUILD_RAxTID(sta_id, tid) (((sta_id) << 4) + (tid))
1144 void iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int txq_id, u16 ssn,
1145 const struct iwl_trans_txq_scd_cfg *cfg)
1147 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1150 if (test_and_set_bit(txq_id, trans_pcie->queue_used))
1151 WARN_ONCE(1, "queue %d already used - expect issues", txq_id);
1156 /* Disable the scheduler prior configuring the cmd queue */
1157 if (txq_id == trans_pcie->cmd_queue &&
1158 trans_pcie->scd_set_active)
1159 iwl_scd_enable_set_active(trans, 0);
1161 /* Stop this Tx queue before configuring it */
1162 iwl_scd_txq_set_inactive(trans, txq_id);
1164 /* Set this queue as a chain-building queue unless it is CMD */
1165 if (txq_id != trans_pcie->cmd_queue)
1166 iwl_scd_txq_set_chain(trans, txq_id);
1168 if (cfg->aggregate) {
1169 u16 ra_tid = BUILD_RAxTID(cfg->sta_id, cfg->tid);
1171 /* Map receiver-address / traffic-ID to this queue */
1172 iwl_pcie_txq_set_ratid_map(trans, ra_tid, txq_id);
1174 /* enable aggregations for the queue */
1175 iwl_scd_txq_enable_agg(trans, txq_id);
1176 trans_pcie->txq[txq_id].ampdu = true;
1179 * disable aggregations for the queue, this will also
1180 * make the ra_tid mapping configuration irrelevant
1181 * since it is now a non-AGG queue.
1183 iwl_scd_txq_disable_agg(trans, txq_id);
1185 ssn = trans_pcie->txq[txq_id].q.read_ptr;
1189 /* Place first TFD at index corresponding to start sequence number.
1190 * Assumes that ssn_idx is valid (!= 0xFFF) */
1191 trans_pcie->txq[txq_id].q.read_ptr = (ssn & 0xff);
1192 trans_pcie->txq[txq_id].q.write_ptr = (ssn & 0xff);
1193 iwl_write_direct32(trans, HBUS_TARG_WRPTR,
1194 (ssn & 0xff) | (txq_id << 8));
1197 u8 frame_limit = cfg->frame_limit;
1199 iwl_write_prph(trans, SCD_QUEUE_RDPTR(txq_id), ssn);
1201 /* Set up Tx window size and frame limit for this queue */
1202 iwl_trans_write_mem32(trans, trans_pcie->scd_base_addr +
1203 SCD_CONTEXT_QUEUE_OFFSET(txq_id), 0);
1204 iwl_trans_write_mem32(trans,
1205 trans_pcie->scd_base_addr +
1206 SCD_CONTEXT_QUEUE_OFFSET(txq_id) + sizeof(u32),
1207 ((frame_limit << SCD_QUEUE_CTX_REG2_WIN_SIZE_POS) &
1208 SCD_QUEUE_CTX_REG2_WIN_SIZE_MSK) |
1209 ((frame_limit << SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
1210 SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK));
1212 /* Set up status area in SRAM, map to Tx DMA/FIFO, activate */
1213 iwl_write_prph(trans, SCD_QUEUE_STATUS_BITS(txq_id),
1214 (1 << SCD_QUEUE_STTS_REG_POS_ACTIVE) |
1215 (cfg->fifo << SCD_QUEUE_STTS_REG_POS_TXF) |
1216 (1 << SCD_QUEUE_STTS_REG_POS_WSL) |
1217 SCD_QUEUE_STTS_REG_MSK);
1219 /* enable the scheduler for this queue (only) */
1220 if (txq_id == trans_pcie->cmd_queue &&
1221 trans_pcie->scd_set_active)
1222 iwl_scd_enable_set_active(trans, BIT(txq_id));
1224 IWL_DEBUG_TX_QUEUES(trans,
1225 "Activate queue %d on FIFO %d WrPtr: %d\n",
1226 txq_id, fifo, ssn & 0xff);
1228 IWL_DEBUG_TX_QUEUES(trans,
1229 "Activate queue %d WrPtr: %d\n",
1230 txq_id, ssn & 0xff);
1233 trans_pcie->txq[txq_id].active = true;
1236 void iwl_trans_pcie_txq_disable(struct iwl_trans *trans, int txq_id,
1239 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1240 u32 stts_addr = trans_pcie->scd_base_addr +
1241 SCD_TX_STTS_QUEUE_OFFSET(txq_id);
1242 static const u32 zero_val[4] = {};
1245 * Upon HW Rfkill - we stop the device, and then stop the queues
1246 * in the op_mode. Just for the sake of the simplicity of the op_mode,
1247 * allow the op_mode to call txq_disable after it already called
1250 if (!test_and_clear_bit(txq_id, trans_pcie->queue_used)) {
1251 WARN_ONCE(test_bit(STATUS_DEVICE_ENABLED, &trans->status),
1252 "queue %d not used", txq_id);
1256 if (configure_scd) {
1257 iwl_scd_txq_set_inactive(trans, txq_id);
1259 iwl_trans_write_mem(trans, stts_addr, (void *)zero_val,
1260 ARRAY_SIZE(zero_val));
1263 iwl_pcie_txq_unmap(trans, txq_id);
1264 trans_pcie->txq[txq_id].ampdu = false;
1266 IWL_DEBUG_TX_QUEUES(trans, "Deactivate queue %d\n", txq_id);
1269 /*************** HOST COMMAND QUEUE FUNCTIONS *****/
1272 * iwl_pcie_enqueue_hcmd - enqueue a uCode command
1273 * @priv: device private data point
1274 * @cmd: a pointer to the ucode command structure
1276 * The function returns < 0 values to indicate the operation
1277 * failed. On success, it returns the index (>= 0) of command in the
1280 static int iwl_pcie_enqueue_hcmd(struct iwl_trans *trans,
1281 struct iwl_host_cmd *cmd)
1283 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1284 struct iwl_txq *txq = &trans_pcie->txq[trans_pcie->cmd_queue];
1285 struct iwl_queue *q = &txq->q;
1286 struct iwl_device_cmd *out_cmd;
1287 struct iwl_cmd_meta *out_meta;
1288 unsigned long flags;
1289 void *dup_buf = NULL;
1290 dma_addr_t phys_addr;
1292 u16 copy_size, cmd_size, scratch_size;
1293 bool had_nocopy = false;
1296 const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
1297 u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
1299 copy_size = sizeof(out_cmd->hdr);
1300 cmd_size = sizeof(out_cmd->hdr);
1302 /* need one for the header if the first is NOCOPY */
1303 BUILD_BUG_ON(IWL_MAX_CMD_TBS_PER_TFD > IWL_NUM_OF_TBS - 1);
1305 for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
1306 cmddata[i] = cmd->data[i];
1307 cmdlen[i] = cmd->len[i];
1312 /* need at least IWL_HCMD_SCRATCHBUF_SIZE copied */
1313 if (copy_size < IWL_HCMD_SCRATCHBUF_SIZE) {
1314 int copy = IWL_HCMD_SCRATCHBUF_SIZE - copy_size;
1316 if (copy > cmdlen[i])
1323 if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) {
1325 if (WARN_ON(cmd->dataflags[i] & IWL_HCMD_DFL_DUP)) {
1329 } else if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP) {
1331 * This is also a chunk that isn't copied
1332 * to the static buffer so set had_nocopy.
1336 /* only allowed once */
1337 if (WARN_ON(dup_buf)) {
1342 dup_buf = kmemdup(cmddata[i], cmdlen[i],
1347 /* NOCOPY must not be followed by normal! */
1348 if (WARN_ON(had_nocopy)) {
1352 copy_size += cmdlen[i];
1354 cmd_size += cmd->len[i];
1358 * If any of the command structures end up being larger than
1359 * the TFD_MAX_PAYLOAD_SIZE and they aren't dynamically
1360 * allocated into separate TFDs, then we will need to
1361 * increase the size of the buffers.
1363 if (WARN(copy_size > TFD_MAX_PAYLOAD_SIZE,
1364 "Command %s (%#x) is too large (%d bytes)\n",
1365 get_cmd_string(trans_pcie, cmd->id), cmd->id, copy_size)) {
1370 spin_lock_bh(&txq->lock);
1372 if (iwl_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
1373 spin_unlock_bh(&txq->lock);
1375 IWL_ERR(trans, "No space in command queue\n");
1376 iwl_op_mode_cmd_queue_full(trans->op_mode);
1381 idx = get_cmd_index(q, q->write_ptr);
1382 out_cmd = txq->entries[idx].cmd;
1383 out_meta = &txq->entries[idx].meta;
1385 memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */
1386 if (cmd->flags & CMD_WANT_SKB)
1387 out_meta->source = cmd;
1389 /* set up the header */
1391 out_cmd->hdr.cmd = cmd->id;
1392 out_cmd->hdr.flags = 0;
1393 out_cmd->hdr.sequence =
1394 cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) |
1395 INDEX_TO_SEQ(q->write_ptr));
1397 /* and copy the data that needs to be copied */
1398 cmd_pos = offsetof(struct iwl_device_cmd, payload);
1399 copy_size = sizeof(out_cmd->hdr);
1400 for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
1406 /* copy everything if not nocopy/dup */
1407 if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
1408 IWL_HCMD_DFL_DUP))) {
1411 memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
1418 * Otherwise we need at least IWL_HCMD_SCRATCHBUF_SIZE copied
1419 * in total (for the scratchbuf handling), but copy up to what
1420 * we can fit into the payload for debug dump purposes.
1422 copy = min_t(int, TFD_MAX_PAYLOAD_SIZE - cmd_pos, cmd->len[i]);
1424 memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
1427 /* However, treat copy_size the proper way, we need it below */
1428 if (copy_size < IWL_HCMD_SCRATCHBUF_SIZE) {
1429 copy = IWL_HCMD_SCRATCHBUF_SIZE - copy_size;
1431 if (copy > cmd->len[i])
1438 "Sending command %s (#%x), seq: 0x%04X, %d bytes at %d[%d]:%d\n",
1439 get_cmd_string(trans_pcie, out_cmd->hdr.cmd),
1440 out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence),
1441 cmd_size, q->write_ptr, idx, trans_pcie->cmd_queue);
1443 /* start the TFD with the scratchbuf */
1444 scratch_size = min_t(int, copy_size, IWL_HCMD_SCRATCHBUF_SIZE);
1445 memcpy(&txq->scratchbufs[q->write_ptr], &out_cmd->hdr, scratch_size);
1446 iwl_pcie_txq_build_tfd(trans, txq,
1447 iwl_pcie_get_scratchbuf_dma(txq, q->write_ptr),
1448 scratch_size, true);
1450 /* map first command fragment, if any remains */
1451 if (copy_size > scratch_size) {
1452 phys_addr = dma_map_single(trans->dev,
1453 ((u8 *)&out_cmd->hdr) + scratch_size,
1454 copy_size - scratch_size,
1456 if (dma_mapping_error(trans->dev, phys_addr)) {
1457 iwl_pcie_tfd_unmap(trans, out_meta,
1458 &txq->tfds[q->write_ptr]);
1463 iwl_pcie_txq_build_tfd(trans, txq, phys_addr,
1464 copy_size - scratch_size, false);
1467 /* map the remaining (adjusted) nocopy/dup fragments */
1468 for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
1469 const void *data = cmddata[i];
1473 if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
1476 if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP)
1478 phys_addr = dma_map_single(trans->dev, (void *)data,
1479 cmdlen[i], DMA_TO_DEVICE);
1480 if (dma_mapping_error(trans->dev, phys_addr)) {
1481 iwl_pcie_tfd_unmap(trans, out_meta,
1482 &txq->tfds[q->write_ptr]);
1487 iwl_pcie_txq_build_tfd(trans, txq, phys_addr, cmdlen[i], false);
1490 out_meta->flags = cmd->flags;
1491 if (WARN_ON_ONCE(txq->entries[idx].free_buf))
1492 kzfree(txq->entries[idx].free_buf);
1493 txq->entries[idx].free_buf = dup_buf;
1495 trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size, &out_cmd->hdr);
1497 /* start timer if queue currently empty */
1498 if (q->read_ptr == q->write_ptr && trans_pcie->wd_timeout)
1499 mod_timer(&txq->stuck_timer, jiffies + trans_pcie->wd_timeout);
1501 spin_lock_irqsave(&trans_pcie->reg_lock, flags);
1502 ret = iwl_pcie_set_cmd_in_flight(trans, cmd);
1505 spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
1509 /* Increment and update queue's write index */
1510 q->write_ptr = iwl_queue_inc_wrap(q->write_ptr);
1511 iwl_pcie_txq_inc_wr_ptr(trans, txq);
1513 spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
1516 spin_unlock_bh(&txq->lock);
1524 * iwl_pcie_hcmd_complete - Pull unused buffers off the queue and reclaim them
1525 * @rxb: Rx buffer to reclaim
1526 * @handler_status: return value of the handler of the command
1527 * (put in setup_rx_handlers)
1529 * If an Rx buffer has an async callback associated with it the callback
1530 * will be executed. The attached skb (if present) will only be freed
1531 * if the callback returns 1
1533 void iwl_pcie_hcmd_complete(struct iwl_trans *trans,
1534 struct iwl_rx_cmd_buffer *rxb, int handler_status)
1536 struct iwl_rx_packet *pkt = rxb_addr(rxb);
1537 u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1538 int txq_id = SEQ_TO_QUEUE(sequence);
1539 int index = SEQ_TO_INDEX(sequence);
1541 struct iwl_device_cmd *cmd;
1542 struct iwl_cmd_meta *meta;
1543 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1544 struct iwl_txq *txq = &trans_pcie->txq[trans_pcie->cmd_queue];
1546 /* If a Tx command is being handled and it isn't in the actual
1547 * command queue then there a command routing bug has been introduced
1548 * in the queue management code. */
1549 if (WARN(txq_id != trans_pcie->cmd_queue,
1550 "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n",
1551 txq_id, trans_pcie->cmd_queue, sequence,
1552 trans_pcie->txq[trans_pcie->cmd_queue].q.read_ptr,
1553 trans_pcie->txq[trans_pcie->cmd_queue].q.write_ptr)) {
1554 iwl_print_hex_error(trans, pkt, 32);
1558 spin_lock_bh(&txq->lock);
1560 cmd_index = get_cmd_index(&txq->q, index);
1561 cmd = txq->entries[cmd_index].cmd;
1562 meta = &txq->entries[cmd_index].meta;
1564 iwl_pcie_tfd_unmap(trans, meta, &txq->tfds[index]);
1566 /* Input error checking is done when commands are added to queue. */
1567 if (meta->flags & CMD_WANT_SKB) {
1568 struct page *p = rxb_steal_page(rxb);
1570 meta->source->resp_pkt = pkt;
1571 meta->source->_rx_page_addr = (unsigned long)page_address(p);
1572 meta->source->_rx_page_order = trans_pcie->rx_page_order;
1573 meta->source->handler_status = handler_status;
1576 iwl_pcie_cmdq_reclaim(trans, txq_id, index);
1578 if (!(meta->flags & CMD_ASYNC)) {
1579 if (!test_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status)) {
1581 "HCMD_ACTIVE already clear for command %s\n",
1582 get_cmd_string(trans_pcie, cmd->hdr.cmd));
1584 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
1585 IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n",
1586 get_cmd_string(trans_pcie, cmd->hdr.cmd));
1587 wake_up(&trans_pcie->wait_command_queue);
1592 spin_unlock_bh(&txq->lock);
1595 #define HOST_COMPLETE_TIMEOUT (2 * HZ)
1597 static int iwl_pcie_send_hcmd_async(struct iwl_trans *trans,
1598 struct iwl_host_cmd *cmd)
1600 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1603 /* An asynchronous command can not expect an SKB to be set. */
1604 if (WARN_ON(cmd->flags & CMD_WANT_SKB))
1607 ret = iwl_pcie_enqueue_hcmd(trans, cmd);
1610 "Error sending %s: enqueue_hcmd failed: %d\n",
1611 get_cmd_string(trans_pcie, cmd->id), ret);
1617 static int iwl_pcie_send_hcmd_sync(struct iwl_trans *trans,
1618 struct iwl_host_cmd *cmd)
1620 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1624 IWL_DEBUG_INFO(trans, "Attempting to send sync command %s\n",
1625 get_cmd_string(trans_pcie, cmd->id));
1627 if (WARN(test_and_set_bit(STATUS_SYNC_HCMD_ACTIVE,
1629 "Command %s: a command is already active!\n",
1630 get_cmd_string(trans_pcie, cmd->id)))
1633 IWL_DEBUG_INFO(trans, "Setting HCMD_ACTIVE for command %s\n",
1634 get_cmd_string(trans_pcie, cmd->id));
1636 cmd_idx = iwl_pcie_enqueue_hcmd(trans, cmd);
1639 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
1641 "Error sending %s: enqueue_hcmd failed: %d\n",
1642 get_cmd_string(trans_pcie, cmd->id), ret);
1646 ret = wait_event_timeout(trans_pcie->wait_command_queue,
1647 !test_bit(STATUS_SYNC_HCMD_ACTIVE,
1649 HOST_COMPLETE_TIMEOUT);
1651 struct iwl_txq *txq = &trans_pcie->txq[trans_pcie->cmd_queue];
1652 struct iwl_queue *q = &txq->q;
1654 IWL_ERR(trans, "Error sending %s: time out after %dms.\n",
1655 get_cmd_string(trans_pcie, cmd->id),
1656 jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
1658 IWL_ERR(trans, "Current CMD queue read_ptr %d write_ptr %d\n",
1659 q->read_ptr, q->write_ptr);
1661 clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
1662 IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n",
1663 get_cmd_string(trans_pcie, cmd->id));
1666 iwl_force_nmi(trans);
1667 iwl_trans_fw_error(trans);
1672 if (test_bit(STATUS_FW_ERROR, &trans->status)) {
1673 IWL_ERR(trans, "FW error in SYNC CMD %s\n",
1674 get_cmd_string(trans_pcie, cmd->id));
1680 if (!(cmd->flags & CMD_SEND_IN_RFKILL) &&
1681 test_bit(STATUS_RFKILL, &trans->status)) {
1682 IWL_DEBUG_RF_KILL(trans, "RFKILL in SYNC CMD... no rsp\n");
1687 if ((cmd->flags & CMD_WANT_SKB) && !cmd->resp_pkt) {
1688 IWL_ERR(trans, "Error: Response NULL in '%s'\n",
1689 get_cmd_string(trans_pcie, cmd->id));
1697 if (cmd->flags & CMD_WANT_SKB) {
1699 * Cancel the CMD_WANT_SKB flag for the cmd in the
1700 * TX cmd queue. Otherwise in case the cmd comes
1701 * in later, it will possibly set an invalid
1702 * address (cmd->meta.source).
1704 trans_pcie->txq[trans_pcie->cmd_queue].
1705 entries[cmd_idx].meta.flags &= ~CMD_WANT_SKB;
1708 if (cmd->resp_pkt) {
1710 cmd->resp_pkt = NULL;
1716 int iwl_trans_pcie_send_hcmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
1718 if (!(cmd->flags & CMD_SEND_IN_RFKILL) &&
1719 test_bit(STATUS_RFKILL, &trans->status)) {
1720 IWL_DEBUG_RF_KILL(trans, "Dropping CMD 0x%x: RF KILL\n",
1725 if (cmd->flags & CMD_ASYNC)
1726 return iwl_pcie_send_hcmd_async(trans, cmd);
1728 /* We still can fail on RFKILL that can be asserted while we wait */
1729 return iwl_pcie_send_hcmd_sync(trans, cmd);
1732 int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb,
1733 struct iwl_device_cmd *dev_cmd, int txq_id)
1735 struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
1736 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1737 struct iwl_tx_cmd *tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
1738 struct iwl_cmd_meta *out_meta;
1739 struct iwl_txq *txq;
1740 struct iwl_queue *q;
1741 dma_addr_t tb0_phys, tb1_phys, scratch_phys;
1743 u16 len, tb1_len, tb2_len;
1744 bool wait_write_ptr;
1745 __le16 fc = hdr->frame_control;
1746 u8 hdr_len = ieee80211_hdrlen(fc);
1749 txq = &trans_pcie->txq[txq_id];
1752 if (WARN_ONCE(!test_bit(txq_id, trans_pcie->queue_used),
1753 "TX on unused queue %d\n", txq_id))
1756 spin_lock(&txq->lock);
1758 /* In AGG mode, the index in the ring must correspond to the WiFi
1759 * sequence number. This is a HW requirements to help the SCD to parse
1761 * Check here that the packets are in the right place on the ring.
1763 wifi_seq = IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl));
1764 WARN_ONCE(txq->ampdu &&
1765 (wifi_seq & 0xff) != q->write_ptr,
1766 "Q: %d WiFi Seq %d tfdNum %d",
1767 txq_id, wifi_seq, q->write_ptr);
1769 /* Set up driver data for this TFD */
1770 txq->entries[q->write_ptr].skb = skb;
1771 txq->entries[q->write_ptr].cmd = dev_cmd;
1773 dev_cmd->hdr.sequence =
1774 cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
1775 INDEX_TO_SEQ(q->write_ptr)));
1777 tb0_phys = iwl_pcie_get_scratchbuf_dma(txq, q->write_ptr);
1778 scratch_phys = tb0_phys + sizeof(struct iwl_cmd_header) +
1779 offsetof(struct iwl_tx_cmd, scratch);
1781 tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys);
1782 tx_cmd->dram_msb_ptr = iwl_get_dma_hi_addr(scratch_phys);
1784 /* Set up first empty entry in queue's array of Tx/cmd buffers */
1785 out_meta = &txq->entries[q->write_ptr].meta;
1788 * The second TB (tb1) points to the remainder of the TX command
1789 * and the 802.11 header - dword aligned size
1790 * (This calculation modifies the TX command, so do it before the
1791 * setup of the first TB)
1793 len = sizeof(struct iwl_tx_cmd) + sizeof(struct iwl_cmd_header) +
1794 hdr_len - IWL_HCMD_SCRATCHBUF_SIZE;
1795 tb1_len = ALIGN(len, 4);
1797 /* Tell NIC about any 2-byte padding after MAC header */
1799 tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK;
1801 /* The first TB points to the scratchbuf data - min_copy bytes */
1802 memcpy(&txq->scratchbufs[q->write_ptr], &dev_cmd->hdr,
1803 IWL_HCMD_SCRATCHBUF_SIZE);
1804 iwl_pcie_txq_build_tfd(trans, txq, tb0_phys,
1805 IWL_HCMD_SCRATCHBUF_SIZE, true);
1807 /* there must be data left over for TB1 or this code must be changed */
1808 BUILD_BUG_ON(sizeof(struct iwl_tx_cmd) < IWL_HCMD_SCRATCHBUF_SIZE);
1810 /* map the data for TB1 */
1811 tb1_addr = ((u8 *)&dev_cmd->hdr) + IWL_HCMD_SCRATCHBUF_SIZE;
1812 tb1_phys = dma_map_single(trans->dev, tb1_addr, tb1_len, DMA_TO_DEVICE);
1813 if (unlikely(dma_mapping_error(trans->dev, tb1_phys)))
1815 iwl_pcie_txq_build_tfd(trans, txq, tb1_phys, tb1_len, false);
1818 * Set up TFD's third entry to point directly to remainder
1819 * of skb, if any (802.11 null frames have no payload).
1821 tb2_len = skb->len - hdr_len;
1823 dma_addr_t tb2_phys = dma_map_single(trans->dev,
1824 skb->data + hdr_len,
1825 tb2_len, DMA_TO_DEVICE);
1826 if (unlikely(dma_mapping_error(trans->dev, tb2_phys))) {
1827 iwl_pcie_tfd_unmap(trans, out_meta,
1828 &txq->tfds[q->write_ptr]);
1831 iwl_pcie_txq_build_tfd(trans, txq, tb2_phys, tb2_len, false);
1834 /* Set up entry for this TFD in Tx byte-count array */
1835 iwl_pcie_txq_update_byte_cnt_tbl(trans, txq, le16_to_cpu(tx_cmd->len));
1837 trace_iwlwifi_dev_tx(trans->dev, skb,
1838 &txq->tfds[txq->q.write_ptr],
1839 sizeof(struct iwl_tfd),
1840 &dev_cmd->hdr, IWL_HCMD_SCRATCHBUF_SIZE + tb1_len,
1841 skb->data + hdr_len, tb2_len);
1842 trace_iwlwifi_dev_tx_data(trans->dev, skb,
1843 skb->data + hdr_len, tb2_len);
1845 wait_write_ptr = ieee80211_has_morefrags(fc);
1847 /* start timer if queue currently empty */
1848 if (q->read_ptr == q->write_ptr) {
1849 if (txq->need_update && trans_pcie->wd_timeout)
1850 mod_timer(&txq->stuck_timer,
1851 jiffies + trans_pcie->wd_timeout);
1852 IWL_DEBUG_RPM(trans, "Q: %d first tx - take ref\n", q->id);
1853 iwl_trans_pcie_ref(trans);
1856 /* Tell device the write index *just past* this latest filled TFD */
1857 q->write_ptr = iwl_queue_inc_wrap(q->write_ptr);
1858 if (!wait_write_ptr)
1859 iwl_pcie_txq_inc_wr_ptr(trans, txq);
1862 * At this point the frame is "transmitted" successfully
1863 * and we will get a TX status notification eventually.
1865 if (iwl_queue_space(q) < q->high_mark) {
1867 iwl_pcie_txq_inc_wr_ptr(trans, txq);
1869 iwl_stop_queue(trans, txq);
1871 spin_unlock(&txq->lock);
1874 spin_unlock(&txq->lock);