1 /******************************************************************************
3 * Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved.
5 * Portions of this file are derived from the ipw3945 project, as well
6 * as portions of the ieee80211 subsystem header files.
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.
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
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
21 * The full GNU General Public License is included in this distribution in the
22 * file called LICENSE.
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
28 *****************************************************************************/
29 #include <linux/etherdevice.h>
30 #include <linux/slab.h>
31 #include <linux/sched.h>
33 #include "iwl-debug.h"
37 #include "iwl-agn-hw.h"
38 #include "iwl-op-mode.h"
39 #include "iwl-trans-pcie-int.h"
41 #define IWL_TX_CRC_SIZE 4
42 #define IWL_TX_DELIMITER_SIZE 4
45 * iwl_trans_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array
47 void iwl_trans_txq_update_byte_cnt_tbl(struct iwl_trans
*trans
,
48 struct iwl_tx_queue
*txq
,
51 struct iwlagn_scd_bc_tbl
*scd_bc_tbl
;
52 struct iwl_trans_pcie
*trans_pcie
=
53 IWL_TRANS_GET_PCIE_TRANS(trans
);
54 int write_ptr
= txq
->q
.write_ptr
;
55 int txq_id
= txq
->q
.id
;
58 u16 len
= byte_cnt
+ IWL_TX_CRC_SIZE
+ IWL_TX_DELIMITER_SIZE
;
60 struct iwl_tx_cmd
*tx_cmd
=
61 (struct iwl_tx_cmd
*) txq
->cmd
[txq
->q
.write_ptr
]->payload
;
63 scd_bc_tbl
= trans_pcie
->scd_bc_tbls
.addr
;
65 WARN_ON(len
> 0xFFF || write_ptr
>= TFD_QUEUE_SIZE_MAX
);
67 sta_id
= tx_cmd
->sta_id
;
68 sec_ctl
= tx_cmd
->sec_ctl
;
70 switch (sec_ctl
& TX_CMD_SEC_MSK
) {
78 len
+= WEP_IV_LEN
+ WEP_ICV_LEN
;
82 bc_ent
= cpu_to_le16((len
& 0xFFF) | (sta_id
<< 12));
84 scd_bc_tbl
[txq_id
].tfd_offset
[write_ptr
] = bc_ent
;
86 if (write_ptr
< TFD_QUEUE_SIZE_BC_DUP
)
88 tfd_offset
[TFD_QUEUE_SIZE_MAX
+ write_ptr
] = bc_ent
;
92 * iwl_txq_update_write_ptr - Send new write index to hardware
94 void iwl_txq_update_write_ptr(struct iwl_trans
*trans
, struct iwl_tx_queue
*txq
)
97 int txq_id
= txq
->q
.id
;
99 if (txq
->need_update
== 0)
102 if (cfg(trans
)->base_params
->shadow_reg_enable
) {
103 /* shadow register enabled */
104 iwl_write32(trans
, HBUS_TARG_WRPTR
,
105 txq
->q
.write_ptr
| (txq_id
<< 8));
107 struct iwl_trans_pcie
*trans_pcie
=
108 IWL_TRANS_GET_PCIE_TRANS(trans
);
109 /* if we're trying to save power */
110 if (test_bit(STATUS_TPOWER_PMI
, &trans_pcie
->status
)) {
111 /* wake up nic if it's powered down ...
112 * uCode will wake up, and interrupt us again, so next
113 * time we'll skip this part. */
114 reg
= iwl_read32(trans
, CSR_UCODE_DRV_GP1
);
116 if (reg
& CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP
) {
117 IWL_DEBUG_INFO(trans
,
118 "Tx queue %d requesting wakeup,"
119 " GP1 = 0x%x\n", txq_id
, reg
);
120 iwl_set_bit(trans
, CSR_GP_CNTRL
,
121 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ
);
125 iwl_write_direct32(trans
, HBUS_TARG_WRPTR
,
126 txq
->q
.write_ptr
| (txq_id
<< 8));
129 * else not in power-save mode,
130 * uCode will never sleep when we're
131 * trying to tx (during RFKILL, we're not trying to tx).
134 iwl_write32(trans
, HBUS_TARG_WRPTR
,
135 txq
->q
.write_ptr
| (txq_id
<< 8));
137 txq
->need_update
= 0;
140 static inline dma_addr_t
iwl_tfd_tb_get_addr(struct iwl_tfd
*tfd
, u8 idx
)
142 struct iwl_tfd_tb
*tb
= &tfd
->tbs
[idx
];
144 dma_addr_t addr
= get_unaligned_le32(&tb
->lo
);
145 if (sizeof(dma_addr_t
) > sizeof(u32
))
147 ((dma_addr_t
)(le16_to_cpu(tb
->hi_n_len
) & 0xF) << 16) << 16;
152 static inline u16
iwl_tfd_tb_get_len(struct iwl_tfd
*tfd
, u8 idx
)
154 struct iwl_tfd_tb
*tb
= &tfd
->tbs
[idx
];
156 return le16_to_cpu(tb
->hi_n_len
) >> 4;
159 static inline void iwl_tfd_set_tb(struct iwl_tfd
*tfd
, u8 idx
,
160 dma_addr_t addr
, u16 len
)
162 struct iwl_tfd_tb
*tb
= &tfd
->tbs
[idx
];
163 u16 hi_n_len
= len
<< 4;
165 put_unaligned_le32(addr
, &tb
->lo
);
166 if (sizeof(dma_addr_t
) > sizeof(u32
))
167 hi_n_len
|= ((addr
>> 16) >> 16) & 0xF;
169 tb
->hi_n_len
= cpu_to_le16(hi_n_len
);
171 tfd
->num_tbs
= idx
+ 1;
174 static inline u8
iwl_tfd_get_num_tbs(struct iwl_tfd
*tfd
)
176 return tfd
->num_tbs
& 0x1f;
179 static void iwlagn_unmap_tfd(struct iwl_trans
*trans
, struct iwl_cmd_meta
*meta
,
180 struct iwl_tfd
*tfd
, enum dma_data_direction dma_dir
)
185 /* Sanity check on number of chunks */
186 num_tbs
= iwl_tfd_get_num_tbs(tfd
);
188 if (num_tbs
>= IWL_NUM_OF_TBS
) {
189 IWL_ERR(trans
, "Too many chunks: %i\n", num_tbs
);
190 /* @todo issue fatal error, it is quite serious situation */
196 dma_unmap_single(trans
->dev
,
197 dma_unmap_addr(meta
, mapping
),
198 dma_unmap_len(meta
, len
),
201 /* Unmap chunks, if any. */
202 for (i
= 1; i
< num_tbs
; i
++)
203 dma_unmap_single(trans
->dev
, iwl_tfd_tb_get_addr(tfd
, i
),
204 iwl_tfd_tb_get_len(tfd
, i
), dma_dir
);
208 * iwlagn_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr]
209 * @trans - transport private data
211 * @index - the index of the TFD to be freed
212 *@dma_dir - the direction of the DMA mapping
214 * Does NOT advance any TFD circular buffer read/write indexes
215 * Does NOT free the TFD itself (which is within circular buffer)
217 void iwlagn_txq_free_tfd(struct iwl_trans
*trans
, struct iwl_tx_queue
*txq
,
218 int index
, enum dma_data_direction dma_dir
)
220 struct iwl_tfd
*tfd_tmp
= txq
->tfds
;
222 lockdep_assert_held(&txq
->lock
);
224 iwlagn_unmap_tfd(trans
, &txq
->meta
[index
], &tfd_tmp
[index
], dma_dir
);
230 skb
= txq
->skbs
[index
];
232 /* Can be called from irqs-disabled context
233 * If skb is not NULL, it means that the whole queue is being
234 * freed and that the queue is not empty - free the skb
237 iwl_op_mode_free_skb(trans
->op_mode
, skb
);
238 txq
->skbs
[index
] = NULL
;
243 int iwlagn_txq_attach_buf_to_tfd(struct iwl_trans
*trans
,
244 struct iwl_tx_queue
*txq
,
245 dma_addr_t addr
, u16 len
,
249 struct iwl_tfd
*tfd
, *tfd_tmp
;
254 tfd
= &tfd_tmp
[q
->write_ptr
];
257 memset(tfd
, 0, sizeof(*tfd
));
259 num_tbs
= iwl_tfd_get_num_tbs(tfd
);
261 /* Each TFD can point to a maximum 20 Tx buffers */
262 if (num_tbs
>= IWL_NUM_OF_TBS
) {
263 IWL_ERR(trans
, "Error can not send more than %d chunks\n",
268 if (WARN_ON(addr
& ~DMA_BIT_MASK(36)))
271 if (unlikely(addr
& ~IWL_TX_DMA_MASK
))
272 IWL_ERR(trans
, "Unaligned address = %llx\n",
273 (unsigned long long)addr
);
275 iwl_tfd_set_tb(tfd
, num_tbs
, addr
, len
);
280 /*************** DMA-QUEUE-GENERAL-FUNCTIONS *****
283 * Theory of operation
285 * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
286 * of buffer descriptors, each of which points to one or more data buffers for
287 * the device to read from or fill. Driver and device exchange status of each
288 * queue via "read" and "write" pointers. Driver keeps minimum of 2 empty
289 * entries in each circular buffer, to protect against confusing empty and full
292 * The device reads or writes the data in the queues via the device's several
293 * DMA/FIFO channels. Each queue is mapped to a single DMA channel.
295 * For Tx queue, there are low mark and high mark limits. If, after queuing
296 * the packet for Tx, free space become < low mark, Tx queue stopped. When
297 * reclaiming packets (on 'tx done IRQ), if free space become > high mark,
300 ***************************************************/
302 int iwl_queue_space(const struct iwl_queue
*q
)
304 int s
= q
->read_ptr
- q
->write_ptr
;
306 if (q
->read_ptr
> q
->write_ptr
)
311 /* keep some reserve to not confuse empty and full situations */
319 * iwl_queue_init - Initialize queue's high/low-water and read/write indexes
321 int iwl_queue_init(struct iwl_queue
*q
, int count
, int slots_num
, u32 id
)
324 q
->n_window
= slots_num
;
327 /* count must be power-of-two size, otherwise iwl_queue_inc_wrap
328 * and iwl_queue_dec_wrap are broken. */
329 if (WARN_ON(!is_power_of_2(count
)))
332 /* slots_num must be power-of-two size, otherwise
333 * get_cmd_index is broken. */
334 if (WARN_ON(!is_power_of_2(slots_num
)))
337 q
->low_mark
= q
->n_window
/ 4;
341 q
->high_mark
= q
->n_window
/ 8;
342 if (q
->high_mark
< 2)
345 q
->write_ptr
= q
->read_ptr
= 0;
350 static void iwlagn_txq_inval_byte_cnt_tbl(struct iwl_trans
*trans
,
351 struct iwl_tx_queue
*txq
)
353 struct iwl_trans_pcie
*trans_pcie
=
354 IWL_TRANS_GET_PCIE_TRANS(trans
);
355 struct iwlagn_scd_bc_tbl
*scd_bc_tbl
= trans_pcie
->scd_bc_tbls
.addr
;
356 int txq_id
= txq
->q
.id
;
357 int read_ptr
= txq
->q
.read_ptr
;
360 struct iwl_tx_cmd
*tx_cmd
=
361 (struct iwl_tx_cmd
*) txq
->cmd
[txq
->q
.read_ptr
]->payload
;
363 WARN_ON(read_ptr
>= TFD_QUEUE_SIZE_MAX
);
365 if (txq_id
!= trans_pcie
->cmd_queue
)
366 sta_id
= tx_cmd
->sta_id
;
368 bc_ent
= cpu_to_le16(1 | (sta_id
<< 12));
369 scd_bc_tbl
[txq_id
].tfd_offset
[read_ptr
] = bc_ent
;
371 if (read_ptr
< TFD_QUEUE_SIZE_BC_DUP
)
373 tfd_offset
[TFD_QUEUE_SIZE_MAX
+ read_ptr
] = bc_ent
;
376 static int iwlagn_tx_queue_set_q2ratid(struct iwl_trans
*trans
, u16 ra_tid
,
383 struct iwl_trans_pcie
*trans_pcie
=
384 IWL_TRANS_GET_PCIE_TRANS(trans
);
386 scd_q2ratid
= ra_tid
& SCD_QUEUE_RA_TID_MAP_RATID_MSK
;
388 tbl_dw_addr
= trans_pcie
->scd_base_addr
+
389 SCD_TRANS_TBL_OFFSET_QUEUE(txq_id
);
391 tbl_dw
= iwl_read_targ_mem(trans
, tbl_dw_addr
);
394 tbl_dw
= (scd_q2ratid
<< 16) | (tbl_dw
& 0x0000FFFF);
396 tbl_dw
= scd_q2ratid
| (tbl_dw
& 0xFFFF0000);
398 iwl_write_targ_mem(trans
, tbl_dw_addr
, tbl_dw
);
403 static void iwlagn_tx_queue_stop_scheduler(struct iwl_trans
*trans
, u16 txq_id
)
405 /* Simply stop the queue, but don't change any configuration;
406 * the SCD_ACT_EN bit is the write-enable mask for the ACTIVE bit. */
407 iwl_write_prph(trans
,
408 SCD_QUEUE_STATUS_BITS(txq_id
),
409 (0 << SCD_QUEUE_STTS_REG_POS_ACTIVE
)|
410 (1 << SCD_QUEUE_STTS_REG_POS_SCD_ACT_EN
));
413 void iwl_trans_set_wr_ptrs(struct iwl_trans
*trans
,
414 int txq_id
, u32 index
)
416 IWL_DEBUG_TX_QUEUES(trans
, "Q %d WrPtr: %d\n", txq_id
, index
& 0xff);
417 iwl_write_direct32(trans
, HBUS_TARG_WRPTR
,
418 (index
& 0xff) | (txq_id
<< 8));
419 iwl_write_prph(trans
, SCD_QUEUE_RDPTR(txq_id
), index
);
422 void iwl_trans_tx_queue_set_status(struct iwl_trans
*trans
,
423 struct iwl_tx_queue
*txq
,
424 int tx_fifo_id
, bool active
)
426 int txq_id
= txq
->q
.id
;
428 iwl_write_prph(trans
, SCD_QUEUE_STATUS_BITS(txq_id
),
429 (active
<< SCD_QUEUE_STTS_REG_POS_ACTIVE
) |
430 (tx_fifo_id
<< SCD_QUEUE_STTS_REG_POS_TXF
) |
431 (1 << SCD_QUEUE_STTS_REG_POS_WSL
) |
432 SCD_QUEUE_STTS_REG_MSK
);
435 IWL_DEBUG_TX_QUEUES(trans
, "Activate queue %d on FIFO %d\n",
438 IWL_DEBUG_TX_QUEUES(trans
, "Deactivate queue %d\n", txq_id
);
441 void iwl_trans_pcie_tx_agg_setup(struct iwl_trans
*trans
, int txq_id
, int fifo
,
442 int sta_id
, int tid
, int frame_limit
, u16 ssn
)
444 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
446 u16 ra_tid
= BUILD_RAxTID(sta_id
, tid
);
448 if (test_and_set_bit(txq_id
, trans_pcie
->queue_used
))
449 WARN_ONCE(1, "queue %d already used - expect issues", txq_id
);
451 spin_lock_irqsave(&trans_pcie
->irq_lock
, flags
);
453 /* Stop this Tx queue before configuring it */
454 iwlagn_tx_queue_stop_scheduler(trans
, txq_id
);
456 /* Map receiver-address / traffic-ID to this queue */
457 iwlagn_tx_queue_set_q2ratid(trans
, ra_tid
, txq_id
);
459 /* Set this queue as a chain-building queue */
460 iwl_set_bits_prph(trans
, SCD_QUEUECHAIN_SEL
, BIT(txq_id
));
462 /* enable aggregations for the queue */
463 iwl_set_bits_prph(trans
, SCD_AGGR_SEL
, BIT(txq_id
));
465 /* Place first TFD at index corresponding to start sequence number.
466 * Assumes that ssn_idx is valid (!= 0xFFF) */
467 trans_pcie
->txq
[txq_id
].q
.read_ptr
= (ssn
& 0xff);
468 trans_pcie
->txq
[txq_id
].q
.write_ptr
= (ssn
& 0xff);
469 iwl_trans_set_wr_ptrs(trans
, txq_id
, ssn
);
471 /* Set up Tx window size and frame limit for this queue */
472 iwl_write_targ_mem(trans
, trans_pcie
->scd_base_addr
+
473 SCD_CONTEXT_QUEUE_OFFSET(txq_id
) + sizeof(u32
),
474 ((frame_limit
<< SCD_QUEUE_CTX_REG2_WIN_SIZE_POS
) &
475 SCD_QUEUE_CTX_REG2_WIN_SIZE_MSK
) |
476 ((frame_limit
<< SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS
) &
477 SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK
));
479 iwl_set_bits_prph(trans
, SCD_INTERRUPT_MASK
, (1 << txq_id
));
481 /* Set up Status area in SRAM, map to Tx DMA/FIFO, activate the queue */
482 iwl_trans_tx_queue_set_status(trans
, &trans_pcie
->txq
[txq_id
],
485 spin_unlock_irqrestore(&trans_pcie
->irq_lock
, flags
);
488 void iwl_trans_pcie_tx_agg_disable(struct iwl_trans
*trans
, int txq_id
)
490 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
492 if (!test_and_clear_bit(txq_id
, trans_pcie
->queue_used
)) {
493 WARN_ONCE(1, "queue %d not used", txq_id
);
497 iwlagn_tx_queue_stop_scheduler(trans
, txq_id
);
499 iwl_clear_bits_prph(trans
, SCD_AGGR_SEL
, BIT(txq_id
));
501 trans_pcie
->txq
[txq_id
].q
.read_ptr
= 0;
502 trans_pcie
->txq
[txq_id
].q
.write_ptr
= 0;
503 iwl_trans_set_wr_ptrs(trans
, txq_id
, 0);
505 iwl_clear_bits_prph(trans
, SCD_INTERRUPT_MASK
, BIT(txq_id
));
507 iwl_trans_tx_queue_set_status(trans
, &trans_pcie
->txq
[txq_id
],
511 /*************** HOST COMMAND QUEUE FUNCTIONS *****/
514 * iwl_enqueue_hcmd - enqueue a uCode command
515 * @priv: device private data point
516 * @cmd: a point to the ucode command structure
518 * The function returns < 0 values to indicate the operation is
519 * failed. On success, it turns the index (> 0) of command in the
522 static int iwl_enqueue_hcmd(struct iwl_trans
*trans
, struct iwl_host_cmd
*cmd
)
524 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
525 struct iwl_tx_queue
*txq
= &trans_pcie
->txq
[trans_pcie
->cmd_queue
];
526 struct iwl_queue
*q
= &txq
->q
;
527 struct iwl_device_cmd
*out_cmd
;
528 struct iwl_cmd_meta
*out_meta
;
529 dma_addr_t phys_addr
;
531 u16 copy_size
, cmd_size
;
532 bool had_nocopy
= false;
535 #ifdef CONFIG_IWLWIFI_DEVICE_TRACING
536 const void *trace_bufs
[IWL_MAX_CMD_TFDS
+ 1] = {};
537 int trace_lens
[IWL_MAX_CMD_TFDS
+ 1] = {};
541 copy_size
= sizeof(out_cmd
->hdr
);
542 cmd_size
= sizeof(out_cmd
->hdr
);
544 /* need one for the header if the first is NOCOPY */
545 BUILD_BUG_ON(IWL_MAX_CMD_TFDS
> IWL_NUM_OF_TBS
- 1);
547 for (i
= 0; i
< IWL_MAX_CMD_TFDS
; i
++) {
550 if (cmd
->dataflags
[i
] & IWL_HCMD_DFL_NOCOPY
) {
553 /* NOCOPY must not be followed by normal! */
554 if (WARN_ON(had_nocopy
))
556 copy_size
+= cmd
->len
[i
];
558 cmd_size
+= cmd
->len
[i
];
562 * If any of the command structures end up being larger than
563 * the TFD_MAX_PAYLOAD_SIZE and they aren't dynamically
564 * allocated into separate TFDs, then we will need to
565 * increase the size of the buffers.
567 if (WARN_ON(copy_size
> TFD_MAX_PAYLOAD_SIZE
))
570 spin_lock_bh(&txq
->lock
);
572 if (iwl_queue_space(q
) < ((cmd
->flags
& CMD_ASYNC
) ? 2 : 1)) {
573 spin_unlock_bh(&txq
->lock
);
575 IWL_ERR(trans
, "No space in command queue\n");
576 iwl_op_mode_cmd_queue_full(trans
->op_mode
);
580 idx
= get_cmd_index(q
, q
->write_ptr
);
581 out_cmd
= txq
->cmd
[idx
];
582 out_meta
= &txq
->meta
[idx
];
584 memset(out_meta
, 0, sizeof(*out_meta
)); /* re-initialize to NULL */
585 if (cmd
->flags
& CMD_WANT_SKB
)
586 out_meta
->source
= cmd
;
588 /* set up the header */
590 out_cmd
->hdr
.cmd
= cmd
->id
;
591 out_cmd
->hdr
.flags
= 0;
592 out_cmd
->hdr
.sequence
=
593 cpu_to_le16(QUEUE_TO_SEQ(trans_pcie
->cmd_queue
) |
594 INDEX_TO_SEQ(q
->write_ptr
));
596 /* and copy the data that needs to be copied */
598 cmd_dest
= out_cmd
->payload
;
599 for (i
= 0; i
< IWL_MAX_CMD_TFDS
; i
++) {
602 if (cmd
->dataflags
[i
] & IWL_HCMD_DFL_NOCOPY
)
604 memcpy(cmd_dest
, cmd
->data
[i
], cmd
->len
[i
]);
605 cmd_dest
+= cmd
->len
[i
];
609 "Sending command %s (#%x), seq: 0x%04X, %d bytes at %d[%d]:%d\n",
610 trans_pcie_get_cmd_string(trans_pcie
, out_cmd
->hdr
.cmd
),
611 out_cmd
->hdr
.cmd
, le16_to_cpu(out_cmd
->hdr
.sequence
), cmd_size
,
612 q
->write_ptr
, idx
, trans_pcie
->cmd_queue
);
614 phys_addr
= dma_map_single(trans
->dev
, &out_cmd
->hdr
, copy_size
,
616 if (unlikely(dma_mapping_error(trans
->dev
, phys_addr
))) {
621 dma_unmap_addr_set(out_meta
, mapping
, phys_addr
);
622 dma_unmap_len_set(out_meta
, len
, copy_size
);
624 iwlagn_txq_attach_buf_to_tfd(trans
, txq
,
625 phys_addr
, copy_size
, 1);
626 #ifdef CONFIG_IWLWIFI_DEVICE_TRACING
627 trace_bufs
[0] = &out_cmd
->hdr
;
628 trace_lens
[0] = copy_size
;
632 for (i
= 0; i
< IWL_MAX_CMD_TFDS
; i
++) {
635 if (!(cmd
->dataflags
[i
] & IWL_HCMD_DFL_NOCOPY
))
637 phys_addr
= dma_map_single(trans
->dev
,
638 (void *)cmd
->data
[i
],
639 cmd
->len
[i
], DMA_BIDIRECTIONAL
);
640 if (dma_mapping_error(trans
->dev
, phys_addr
)) {
641 iwlagn_unmap_tfd(trans
, out_meta
,
642 &txq
->tfds
[q
->write_ptr
],
648 iwlagn_txq_attach_buf_to_tfd(trans
, txq
, phys_addr
,
650 #ifdef CONFIG_IWLWIFI_DEVICE_TRACING
651 trace_bufs
[trace_idx
] = cmd
->data
[i
];
652 trace_lens
[trace_idx
] = cmd
->len
[i
];
657 out_meta
->flags
= cmd
->flags
;
659 txq
->need_update
= 1;
661 /* check that tracing gets all possible blocks */
662 BUILD_BUG_ON(IWL_MAX_CMD_TFDS
+ 1 != 3);
663 #ifdef CONFIG_IWLWIFI_DEVICE_TRACING
664 trace_iwlwifi_dev_hcmd(trans
->dev
, cmd
->flags
,
665 trace_bufs
[0], trace_lens
[0],
666 trace_bufs
[1], trace_lens
[1],
667 trace_bufs
[2], trace_lens
[2]);
670 /* start timer if queue currently empty */
671 if (q
->read_ptr
== q
->write_ptr
&& trans_pcie
->wd_timeout
)
672 mod_timer(&txq
->stuck_timer
, jiffies
+ trans_pcie
->wd_timeout
);
674 /* Increment and update queue's write index */
675 q
->write_ptr
= iwl_queue_inc_wrap(q
->write_ptr
, q
->n_bd
);
676 iwl_txq_update_write_ptr(trans
, txq
);
679 spin_unlock_bh(&txq
->lock
);
683 static inline void iwl_queue_progress(struct iwl_trans_pcie
*trans_pcie
,
684 struct iwl_tx_queue
*txq
)
686 if (!trans_pcie
->wd_timeout
)
690 * if empty delete timer, otherwise move timer forward
691 * since we're making progress on this queue
693 if (txq
->q
.read_ptr
== txq
->q
.write_ptr
)
694 del_timer(&txq
->stuck_timer
);
696 mod_timer(&txq
->stuck_timer
, jiffies
+ trans_pcie
->wd_timeout
);
700 * iwl_hcmd_queue_reclaim - Reclaim TX command queue entries already Tx'd
702 * When FW advances 'R' index, all entries between old and new 'R' index
703 * need to be reclaimed. As result, some free space forms. If there is
704 * enough free space (> low mark), wake the stack that feeds us.
706 static void iwl_hcmd_queue_reclaim(struct iwl_trans
*trans
, int txq_id
,
709 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
710 struct iwl_tx_queue
*txq
= &trans_pcie
->txq
[txq_id
];
711 struct iwl_queue
*q
= &txq
->q
;
714 lockdep_assert_held(&txq
->lock
);
716 if ((idx
>= q
->n_bd
) || (iwl_queue_used(q
, idx
) == 0)) {
717 IWL_ERR(trans
, "%s: Read index for DMA queue txq id (%d), "
718 "index %d is out of range [0-%d] %d %d.\n", __func__
,
719 txq_id
, idx
, q
->n_bd
, q
->write_ptr
, q
->read_ptr
);
723 for (idx
= iwl_queue_inc_wrap(idx
, q
->n_bd
); q
->read_ptr
!= idx
;
724 q
->read_ptr
= iwl_queue_inc_wrap(q
->read_ptr
, q
->n_bd
)) {
727 IWL_ERR(trans
, "HCMD skipped: index (%d) %d %d\n", idx
,
728 q
->write_ptr
, q
->read_ptr
);
729 iwl_op_mode_nic_error(trans
->op_mode
);
734 iwl_queue_progress(trans_pcie
, txq
);
738 * iwl_tx_cmd_complete - Pull unused buffers off the queue and reclaim them
739 * @rxb: Rx buffer to reclaim
740 * @handler_status: return value of the handler of the command
741 * (put in setup_rx_handlers)
743 * If an Rx buffer has an async callback associated with it the callback
744 * will be executed. The attached skb (if present) will only be freed
745 * if the callback returns 1
747 void iwl_tx_cmd_complete(struct iwl_trans
*trans
, struct iwl_rx_cmd_buffer
*rxb
,
750 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
751 u16 sequence
= le16_to_cpu(pkt
->hdr
.sequence
);
752 int txq_id
= SEQ_TO_QUEUE(sequence
);
753 int index
= SEQ_TO_INDEX(sequence
);
755 struct iwl_device_cmd
*cmd
;
756 struct iwl_cmd_meta
*meta
;
757 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
758 struct iwl_tx_queue
*txq
= &trans_pcie
->txq
[trans_pcie
->cmd_queue
];
760 /* If a Tx command is being handled and it isn't in the actual
761 * command queue then there a command routing bug has been introduced
762 * in the queue management code. */
763 if (WARN(txq_id
!= trans_pcie
->cmd_queue
,
764 "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n",
765 txq_id
, trans_pcie
->cmd_queue
, sequence
,
766 trans_pcie
->txq
[trans_pcie
->cmd_queue
].q
.read_ptr
,
767 trans_pcie
->txq
[trans_pcie
->cmd_queue
].q
.write_ptr
)) {
768 iwl_print_hex_error(trans
, pkt
, 32);
772 spin_lock(&txq
->lock
);
774 cmd_index
= get_cmd_index(&txq
->q
, index
);
775 cmd
= txq
->cmd
[cmd_index
];
776 meta
= &txq
->meta
[cmd_index
];
778 iwlagn_unmap_tfd(trans
, meta
, &txq
->tfds
[index
],
781 /* Input error checking is done when commands are added to queue. */
782 if (meta
->flags
& CMD_WANT_SKB
) {
783 struct page
*p
= rxb_steal_page(rxb
);
785 meta
->source
->resp_pkt
= pkt
;
786 meta
->source
->_rx_page_addr
= (unsigned long)page_address(p
);
787 meta
->source
->_rx_page_order
= trans_pcie
->rx_page_order
;
788 meta
->source
->handler_status
= handler_status
;
791 iwl_hcmd_queue_reclaim(trans
, txq_id
, index
);
793 if (!(meta
->flags
& CMD_ASYNC
)) {
794 if (!test_bit(STATUS_HCMD_ACTIVE
, &trans_pcie
->status
)) {
796 "HCMD_ACTIVE already clear for command %s\n",
797 trans_pcie_get_cmd_string(trans_pcie
,
800 clear_bit(STATUS_HCMD_ACTIVE
, &trans_pcie
->status
);
801 IWL_DEBUG_INFO(trans
, "Clearing HCMD_ACTIVE for command %s\n",
802 trans_pcie_get_cmd_string(trans_pcie
,
804 wake_up(&trans
->wait_command_queue
);
809 spin_unlock(&txq
->lock
);
812 #define HOST_COMPLETE_TIMEOUT (2 * HZ)
814 static int iwl_send_cmd_async(struct iwl_trans
*trans
, struct iwl_host_cmd
*cmd
)
816 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
819 /* An asynchronous command can not expect an SKB to be set. */
820 if (WARN_ON(cmd
->flags
& CMD_WANT_SKB
))
824 ret
= iwl_enqueue_hcmd(trans
, cmd
);
827 "Error sending %s: enqueue_hcmd failed: %d\n",
828 trans_pcie_get_cmd_string(trans_pcie
, cmd
->id
), ret
);
834 static int iwl_send_cmd_sync(struct iwl_trans
*trans
, struct iwl_host_cmd
*cmd
)
836 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
840 IWL_DEBUG_INFO(trans
, "Attempting to send sync command %s\n",
841 trans_pcie_get_cmd_string(trans_pcie
, cmd
->id
));
843 if (WARN_ON(test_and_set_bit(STATUS_HCMD_ACTIVE
,
844 &trans_pcie
->status
))) {
845 IWL_ERR(trans
, "Command %s: a command is already active!\n",
846 trans_pcie_get_cmd_string(trans_pcie
, cmd
->id
));
850 IWL_DEBUG_INFO(trans
, "Setting HCMD_ACTIVE for command %s\n",
851 trans_pcie_get_cmd_string(trans_pcie
, cmd
->id
));
853 cmd_idx
= iwl_enqueue_hcmd(trans
, cmd
);
856 clear_bit(STATUS_HCMD_ACTIVE
, &trans_pcie
->status
);
858 "Error sending %s: enqueue_hcmd failed: %d\n",
859 trans_pcie_get_cmd_string(trans_pcie
, cmd
->id
), ret
);
863 ret
= wait_event_timeout(trans
->wait_command_queue
,
864 !test_bit(STATUS_HCMD_ACTIVE
, &trans_pcie
->status
),
865 HOST_COMPLETE_TIMEOUT
);
867 if (test_bit(STATUS_HCMD_ACTIVE
, &trans_pcie
->status
)) {
868 struct iwl_tx_queue
*txq
=
869 &trans_pcie
->txq
[trans_pcie
->cmd_queue
];
870 struct iwl_queue
*q
= &txq
->q
;
873 "Error sending %s: time out after %dms.\n",
874 trans_pcie_get_cmd_string(trans_pcie
, cmd
->id
),
875 jiffies_to_msecs(HOST_COMPLETE_TIMEOUT
));
878 "Current CMD queue read_ptr %d write_ptr %d\n",
879 q
->read_ptr
, q
->write_ptr
);
881 clear_bit(STATUS_HCMD_ACTIVE
, &trans_pcie
->status
);
882 IWL_DEBUG_INFO(trans
,
883 "Clearing HCMD_ACTIVE for command %s\n",
884 trans_pcie_get_cmd_string(trans_pcie
,
891 if ((cmd
->flags
& CMD_WANT_SKB
) && !cmd
->resp_pkt
) {
892 IWL_ERR(trans
, "Error: Response NULL in '%s'\n",
893 trans_pcie_get_cmd_string(trans_pcie
, cmd
->id
));
901 if (cmd
->flags
& CMD_WANT_SKB
) {
903 * Cancel the CMD_WANT_SKB flag for the cmd in the
904 * TX cmd queue. Otherwise in case the cmd comes
905 * in later, it will possibly set an invalid
906 * address (cmd->meta.source).
908 trans_pcie
->txq
[trans_pcie
->cmd_queue
].meta
[cmd_idx
].flags
&=
914 cmd
->resp_pkt
= NULL
;
920 int iwl_trans_pcie_send_cmd(struct iwl_trans
*trans
, struct iwl_host_cmd
*cmd
)
922 if (cmd
->flags
& CMD_ASYNC
)
923 return iwl_send_cmd_async(trans
, cmd
);
925 return iwl_send_cmd_sync(trans
, cmd
);
928 /* Frees buffers until index _not_ inclusive */
929 int iwl_tx_queue_reclaim(struct iwl_trans
*trans
, int txq_id
, int index
,
930 struct sk_buff_head
*skbs
)
932 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
933 struct iwl_tx_queue
*txq
= &trans_pcie
->txq
[txq_id
];
934 struct iwl_queue
*q
= &txq
->q
;
938 /* This function is not meant to release cmd queue*/
939 if (WARN_ON(txq_id
== trans_pcie
->cmd_queue
))
942 lockdep_assert_held(&txq
->lock
);
944 /*Since we free until index _not_ inclusive, the one before index is
945 * the last we will free. This one must be used */
946 last_to_free
= iwl_queue_dec_wrap(index
, q
->n_bd
);
948 if ((index
>= q
->n_bd
) ||
949 (iwl_queue_used(q
, last_to_free
) == 0)) {
950 IWL_ERR(trans
, "%s: Read index for DMA queue txq id (%d), "
951 "last_to_free %d is out of range [0-%d] %d %d.\n",
952 __func__
, txq_id
, last_to_free
, q
->n_bd
,
953 q
->write_ptr
, q
->read_ptr
);
957 if (WARN_ON(!skb_queue_empty(skbs
)))
961 q
->read_ptr
!= index
;
962 q
->read_ptr
= iwl_queue_inc_wrap(q
->read_ptr
, q
->n_bd
)) {
964 if (WARN_ON_ONCE(txq
->skbs
[txq
->q
.read_ptr
] == NULL
))
967 __skb_queue_tail(skbs
, txq
->skbs
[txq
->q
.read_ptr
]);
969 txq
->skbs
[txq
->q
.read_ptr
] = NULL
;
971 iwlagn_txq_inval_byte_cnt_tbl(trans
, txq
);
973 iwlagn_txq_free_tfd(trans
, txq
, txq
->q
.read_ptr
, DMA_TO_DEVICE
);
977 iwl_queue_progress(trans_pcie
, txq
);