1 /******************************************************************************
3 * Copyright(c) 2003 - 2013 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-op-mode.h"
39 /* FIXME: need to abstract out TX command (once we know what it looks like) */
40 #include "dvm/commands.h"
42 #define IWL_TX_CRC_SIZE 4
43 #define IWL_TX_DELIMITER_SIZE 4
45 /*************** DMA-QUEUE-GENERAL-FUNCTIONS *****
50 * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
51 * of buffer descriptors, each of which points to one or more data buffers for
52 * the device to read from or fill. Driver and device exchange status of each
53 * queue via "read" and "write" pointers. Driver keeps minimum of 2 empty
54 * entries in each circular buffer, to protect against confusing empty and full
57 * The device reads or writes the data in the queues via the device's several
58 * DMA/FIFO channels. Each queue is mapped to a single DMA channel.
60 * For Tx queue, there are low mark and high mark limits. If, after queuing
61 * the packet for Tx, free space become < low mark, Tx queue stopped. When
62 * reclaiming packets (on 'tx done IRQ), if free space become > high mark,
65 ***************************************************/
66 static int iwl_queue_space(const struct iwl_queue
*q
)
72 * To avoid ambiguity between empty and completely full queues, there
73 * should always be less than q->n_bd elements in the queue.
74 * If q->n_window is smaller than q->n_bd, there is no need to reserve
75 * any queue entries for this purpose.
77 if (q
->n_window
< q
->n_bd
)
83 * q->n_bd is a power of 2, so the following is equivalent to modulo by
84 * q->n_bd and is well defined for negative dividends.
86 used
= (q
->write_ptr
- q
->read_ptr
) & (q
->n_bd
- 1);
88 if (WARN_ON(used
> max
))
95 * iwl_queue_init - Initialize queue's high/low-water and read/write indexes
97 static int iwl_queue_init(struct iwl_queue
*q
, int count
, int slots_num
, u32 id
)
100 q
->n_window
= slots_num
;
103 /* count must be power-of-two size, otherwise iwl_queue_inc_wrap
104 * and iwl_queue_dec_wrap are broken. */
105 if (WARN_ON(!is_power_of_2(count
)))
108 /* slots_num must be power-of-two size, otherwise
109 * get_cmd_index is broken. */
110 if (WARN_ON(!is_power_of_2(slots_num
)))
113 q
->low_mark
= q
->n_window
/ 4;
117 q
->high_mark
= q
->n_window
/ 8;
118 if (q
->high_mark
< 2)
127 static int iwl_pcie_alloc_dma_ptr(struct iwl_trans
*trans
,
128 struct iwl_dma_ptr
*ptr
, size_t size
)
130 if (WARN_ON(ptr
->addr
))
133 ptr
->addr
= dma_alloc_coherent(trans
->dev
, size
,
134 &ptr
->dma
, GFP_KERNEL
);
141 static void iwl_pcie_free_dma_ptr(struct iwl_trans
*trans
,
142 struct iwl_dma_ptr
*ptr
)
144 if (unlikely(!ptr
->addr
))
147 dma_free_coherent(trans
->dev
, ptr
->size
, ptr
->addr
, ptr
->dma
);
148 memset(ptr
, 0, sizeof(*ptr
));
151 static void iwl_pcie_txq_stuck_timer(unsigned long data
)
153 struct iwl_txq
*txq
= (void *)data
;
154 struct iwl_queue
*q
= &txq
->q
;
155 struct iwl_trans_pcie
*trans_pcie
= txq
->trans_pcie
;
156 struct iwl_trans
*trans
= iwl_trans_pcie_get_trans(trans_pcie
);
157 u32 scd_sram_addr
= trans_pcie
->scd_base_addr
+
158 SCD_TX_STTS_QUEUE_OFFSET(txq
->q
.id
);
162 spin_lock(&txq
->lock
);
163 /* check if triggered erroneously */
164 if (txq
->q
.read_ptr
== txq
->q
.write_ptr
) {
165 spin_unlock(&txq
->lock
);
168 spin_unlock(&txq
->lock
);
170 IWL_ERR(trans
, "Queue %d stuck for %u ms.\n", txq
->q
.id
,
171 jiffies_to_msecs(trans_pcie
->wd_timeout
));
172 IWL_ERR(trans
, "Current SW read_ptr %d write_ptr %d\n",
173 txq
->q
.read_ptr
, txq
->q
.write_ptr
);
175 iwl_trans_read_mem_bytes(trans
, scd_sram_addr
, buf
, sizeof(buf
));
177 iwl_print_hex_error(trans
, buf
, sizeof(buf
));
179 for (i
= 0; i
< FH_TCSR_CHNL_NUM
; i
++)
180 IWL_ERR(trans
, "FH TRBs(%d) = 0x%08x\n", i
,
181 iwl_read_direct32(trans
, FH_TX_TRB_REG(i
)));
183 for (i
= 0; i
< trans
->cfg
->base_params
->num_of_queues
; i
++) {
184 u32 status
= iwl_read_prph(trans
, SCD_QUEUE_STATUS_BITS(i
));
185 u8 fifo
= (status
>> SCD_QUEUE_STTS_REG_POS_TXF
) & 0x7;
186 bool active
= !!(status
& BIT(SCD_QUEUE_STTS_REG_POS_ACTIVE
));
188 iwl_trans_read_mem32(trans
,
189 trans_pcie
->scd_base_addr
+
190 SCD_TRANS_TBL_OFFSET_QUEUE(i
));
193 tbl_dw
= (tbl_dw
& 0xFFFF0000) >> 16;
195 tbl_dw
= tbl_dw
& 0x0000FFFF;
198 "Q %d is %sactive and mapped to fifo %d ra_tid 0x%04x [%d,%d]\n",
199 i
, active
? "" : "in", fifo
, tbl_dw
,
201 SCD_QUEUE_RDPTR(i
)) & (txq
->q
.n_bd
- 1),
202 iwl_read_prph(trans
, SCD_QUEUE_WRPTR(i
)));
205 for (i
= q
->read_ptr
; i
!= q
->write_ptr
;
206 i
= iwl_queue_inc_wrap(i
, q
->n_bd
))
207 IWL_ERR(trans
, "scratch %d = 0x%08x\n", i
,
208 le32_to_cpu(txq
->scratchbufs
[i
].scratch
));
210 iwl_op_mode_nic_error(trans
->op_mode
);
214 * iwl_pcie_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array
216 static void iwl_pcie_txq_update_byte_cnt_tbl(struct iwl_trans
*trans
,
217 struct iwl_txq
*txq
, u16 byte_cnt
)
219 struct iwlagn_scd_bc_tbl
*scd_bc_tbl
;
220 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
221 int write_ptr
= txq
->q
.write_ptr
;
222 int txq_id
= txq
->q
.id
;
225 u16 len
= byte_cnt
+ IWL_TX_CRC_SIZE
+ IWL_TX_DELIMITER_SIZE
;
227 struct iwl_tx_cmd
*tx_cmd
=
228 (void *) txq
->entries
[txq
->q
.write_ptr
].cmd
->payload
;
230 scd_bc_tbl
= trans_pcie
->scd_bc_tbls
.addr
;
232 WARN_ON(len
> 0xFFF || write_ptr
>= TFD_QUEUE_SIZE_MAX
);
234 sta_id
= tx_cmd
->sta_id
;
235 sec_ctl
= tx_cmd
->sec_ctl
;
237 switch (sec_ctl
& TX_CMD_SEC_MSK
) {
239 len
+= IEEE80211_CCMP_MIC_LEN
;
241 case TX_CMD_SEC_TKIP
:
242 len
+= IEEE80211_TKIP_ICV_LEN
;
245 len
+= IEEE80211_WEP_IV_LEN
+ IEEE80211_WEP_ICV_LEN
;
249 if (trans_pcie
->bc_table_dword
)
250 len
= DIV_ROUND_UP(len
, 4);
252 bc_ent
= cpu_to_le16(len
| (sta_id
<< 12));
254 scd_bc_tbl
[txq_id
].tfd_offset
[write_ptr
] = bc_ent
;
256 if (write_ptr
< TFD_QUEUE_SIZE_BC_DUP
)
258 tfd_offset
[TFD_QUEUE_SIZE_MAX
+ write_ptr
] = bc_ent
;
261 static void iwl_pcie_txq_inval_byte_cnt_tbl(struct iwl_trans
*trans
,
264 struct iwl_trans_pcie
*trans_pcie
=
265 IWL_TRANS_GET_PCIE_TRANS(trans
);
266 struct iwlagn_scd_bc_tbl
*scd_bc_tbl
= trans_pcie
->scd_bc_tbls
.addr
;
267 int txq_id
= txq
->q
.id
;
268 int read_ptr
= txq
->q
.read_ptr
;
271 struct iwl_tx_cmd
*tx_cmd
=
272 (void *)txq
->entries
[txq
->q
.read_ptr
].cmd
->payload
;
274 WARN_ON(read_ptr
>= TFD_QUEUE_SIZE_MAX
);
276 if (txq_id
!= trans_pcie
->cmd_queue
)
277 sta_id
= tx_cmd
->sta_id
;
279 bc_ent
= cpu_to_le16(1 | (sta_id
<< 12));
280 scd_bc_tbl
[txq_id
].tfd_offset
[read_ptr
] = bc_ent
;
282 if (read_ptr
< TFD_QUEUE_SIZE_BC_DUP
)
284 tfd_offset
[TFD_QUEUE_SIZE_MAX
+ read_ptr
] = bc_ent
;
288 * iwl_pcie_txq_inc_wr_ptr - Send new write index to hardware
290 void iwl_pcie_txq_inc_wr_ptr(struct iwl_trans
*trans
, struct iwl_txq
*txq
)
293 int txq_id
= txq
->q
.id
;
295 if (txq
->need_update
== 0)
298 if (trans
->cfg
->base_params
->shadow_reg_enable
) {
299 /* shadow register enabled */
300 iwl_write32(trans
, HBUS_TARG_WRPTR
,
301 txq
->q
.write_ptr
| (txq_id
<< 8));
303 struct iwl_trans_pcie
*trans_pcie
=
304 IWL_TRANS_GET_PCIE_TRANS(trans
);
305 /* if we're trying to save power */
306 if (test_bit(STATUS_TPOWER_PMI
, &trans_pcie
->status
)) {
307 /* wake up nic if it's powered down ...
308 * uCode will wake up, and interrupt us again, so next
309 * time we'll skip this part. */
310 reg
= iwl_read32(trans
, CSR_UCODE_DRV_GP1
);
312 if (reg
& CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP
) {
313 IWL_DEBUG_INFO(trans
,
314 "Tx queue %d requesting wakeup,"
315 " GP1 = 0x%x\n", txq_id
, reg
);
316 iwl_set_bit(trans
, CSR_GP_CNTRL
,
317 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ
);
321 IWL_DEBUG_TX(trans
, "Q:%d WR: 0x%x\n", txq_id
,
324 iwl_write_direct32(trans
, HBUS_TARG_WRPTR
,
325 txq
->q
.write_ptr
| (txq_id
<< 8));
328 * else not in power-save mode,
329 * uCode will never sleep when we're
330 * trying to tx (during RFKILL, we're not trying to tx).
333 iwl_write32(trans
, HBUS_TARG_WRPTR
,
334 txq
->q
.write_ptr
| (txq_id
<< 8));
336 txq
->need_update
= 0;
339 static inline dma_addr_t
iwl_pcie_tfd_tb_get_addr(struct iwl_tfd
*tfd
, u8 idx
)
341 struct iwl_tfd_tb
*tb
= &tfd
->tbs
[idx
];
343 dma_addr_t addr
= get_unaligned_le32(&tb
->lo
);
344 if (sizeof(dma_addr_t
) > sizeof(u32
))
346 ((dma_addr_t
)(le16_to_cpu(tb
->hi_n_len
) & 0xF) << 16) << 16;
351 static inline u16
iwl_pcie_tfd_tb_get_len(struct iwl_tfd
*tfd
, u8 idx
)
353 struct iwl_tfd_tb
*tb
= &tfd
->tbs
[idx
];
355 return le16_to_cpu(tb
->hi_n_len
) >> 4;
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 n_bd and idx is bounded by n_window */
418 int rd_ptr
= txq
->q
.read_ptr
;
419 int idx
= get_cmd_index(&txq
->q
, rd_ptr
);
421 lockdep_assert_held(&txq
->lock
);
423 /* We have only q->n_window txq->entries, but we use q->n_bd tfds */
424 iwl_pcie_tfd_unmap(trans
, &txq
->entries
[idx
].meta
, &tfd_tmp
[rd_ptr
]);
430 skb
= txq
->entries
[idx
].skb
;
432 /* Can be called from irqs-disabled context
433 * If skb is not NULL, it means that the whole queue is being
434 * freed and that the queue is not empty - free the skb
437 iwl_op_mode_free_skb(trans
->op_mode
, skb
);
438 txq
->entries
[idx
].skb
= NULL
;
443 static int iwl_pcie_txq_build_tfd(struct iwl_trans
*trans
, struct iwl_txq
*txq
,
444 dma_addr_t addr
, u16 len
, u8 reset
)
447 struct iwl_tfd
*tfd
, *tfd_tmp
;
452 tfd
= &tfd_tmp
[q
->write_ptr
];
455 memset(tfd
, 0, sizeof(*tfd
));
457 num_tbs
= iwl_pcie_tfd_get_num_tbs(tfd
);
459 /* Each TFD can point to a maximum 20 Tx buffers */
460 if (num_tbs
>= IWL_NUM_OF_TBS
) {
461 IWL_ERR(trans
, "Error can not send more than %d chunks\n",
466 if (WARN(addr
& ~IWL_TX_DMA_MASK
,
467 "Unaligned address = %llx\n", (unsigned long long)addr
))
470 iwl_pcie_tfd_set_tb(tfd
, num_tbs
, addr
, len
);
475 static int iwl_pcie_txq_alloc(struct iwl_trans
*trans
,
476 struct iwl_txq
*txq
, int slots_num
,
479 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
480 size_t tfd_sz
= sizeof(struct iwl_tfd
) * TFD_QUEUE_SIZE_MAX
;
481 size_t scratchbuf_sz
;
484 if (WARN_ON(txq
->entries
|| txq
->tfds
))
487 setup_timer(&txq
->stuck_timer
, iwl_pcie_txq_stuck_timer
,
489 txq
->trans_pcie
= trans_pcie
;
491 txq
->q
.n_window
= slots_num
;
493 txq
->entries
= kcalloc(slots_num
,
494 sizeof(struct iwl_pcie_txq_entry
),
500 if (txq_id
== trans_pcie
->cmd_queue
)
501 for (i
= 0; i
< slots_num
; i
++) {
502 txq
->entries
[i
].cmd
=
503 kmalloc(sizeof(struct iwl_device_cmd
),
505 if (!txq
->entries
[i
].cmd
)
509 /* Circular buffer of transmit frame descriptors (TFDs),
510 * shared with device */
511 txq
->tfds
= dma_alloc_coherent(trans
->dev
, tfd_sz
,
512 &txq
->q
.dma_addr
, GFP_KERNEL
);
516 BUILD_BUG_ON(IWL_HCMD_SCRATCHBUF_SIZE
!= sizeof(*txq
->scratchbufs
));
517 BUILD_BUG_ON(offsetof(struct iwl_pcie_txq_scratch_buf
, scratch
) !=
518 sizeof(struct iwl_cmd_header
) +
519 offsetof(struct iwl_tx_cmd
, scratch
));
521 scratchbuf_sz
= sizeof(*txq
->scratchbufs
) * slots_num
;
523 txq
->scratchbufs
= dma_alloc_coherent(trans
->dev
, scratchbuf_sz
,
524 &txq
->scratchbufs_dma
,
526 if (!txq
->scratchbufs
)
533 dma_free_coherent(trans
->dev
, tfd_sz
, txq
->tfds
, txq
->q
.dma_addr
);
535 if (txq
->entries
&& txq_id
== trans_pcie
->cmd_queue
)
536 for (i
= 0; i
< slots_num
; i
++)
537 kfree(txq
->entries
[i
].cmd
);
545 static int iwl_pcie_txq_init(struct iwl_trans
*trans
, struct iwl_txq
*txq
,
546 int slots_num
, u32 txq_id
)
550 txq
->need_update
= 0;
552 /* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
553 * iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */
554 BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX
& (TFD_QUEUE_SIZE_MAX
- 1));
556 /* Initialize queue's high/low-water marks, and head/tail indexes */
557 ret
= iwl_queue_init(&txq
->q
, TFD_QUEUE_SIZE_MAX
, slots_num
,
562 spin_lock_init(&txq
->lock
);
565 * Tell nic where to find circular buffer of Tx Frame Descriptors for
566 * given Tx queue, and enable the DMA channel used for that queue.
567 * Circular buffer (TFD queue in DRAM) physical base address */
568 iwl_write_direct32(trans
, FH_MEM_CBBC_QUEUE(txq_id
),
569 txq
->q
.dma_addr
>> 8);
575 * iwl_pcie_txq_unmap - Unmap any remaining DMA mappings and free skb's
577 static void iwl_pcie_txq_unmap(struct iwl_trans
*trans
, int txq_id
)
579 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
580 struct iwl_txq
*txq
= &trans_pcie
->txq
[txq_id
];
581 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
, q
->n_bd
);
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 kfree(txq
->entries
[i
].cmd
);
624 kfree(txq
->entries
[i
].free_buf
);
627 /* De-alloc circular buffer of TFDs */
629 dma_free_coherent(dev
, sizeof(struct iwl_tfd
) *
630 txq
->q
.n_bd
, txq
->tfds
, txq
->q
.dma_addr
);
633 dma_free_coherent(dev
,
634 sizeof(*txq
->scratchbufs
) * txq
->q
.n_window
,
635 txq
->scratchbufs
, txq
->scratchbufs_dma
);
641 del_timer_sync(&txq
->stuck_timer
);
643 /* 0-fill queue descriptor structure */
644 memset(txq
, 0, sizeof(*txq
));
648 * Activate/Deactivate Tx DMA/FIFO channels according tx fifos mask
650 static void iwl_pcie_txq_set_sched(struct iwl_trans
*trans
, u32 mask
)
652 struct iwl_trans_pcie __maybe_unused
*trans_pcie
=
653 IWL_TRANS_GET_PCIE_TRANS(trans
);
655 iwl_write_prph(trans
, SCD_TXFACT
, mask
);
658 void iwl_pcie_tx_start(struct iwl_trans
*trans
, u32 scd_base_addr
)
660 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
661 int nq
= trans
->cfg
->base_params
->num_of_queues
;
664 int clear_dwords
= (SCD_TRANS_TBL_OFFSET_QUEUE(nq
) -
665 SCD_CONTEXT_MEM_LOWER_BOUND
) / sizeof(u32
);
667 /* make sure all queue are not stopped/used */
668 memset(trans_pcie
->queue_stopped
, 0, sizeof(trans_pcie
->queue_stopped
));
669 memset(trans_pcie
->queue_used
, 0, sizeof(trans_pcie
->queue_used
));
671 trans_pcie
->scd_base_addr
=
672 iwl_read_prph(trans
, SCD_SRAM_BASE_ADDR
);
674 WARN_ON(scd_base_addr
!= 0 &&
675 scd_base_addr
!= trans_pcie
->scd_base_addr
);
677 /* reset context data, TX status and translation data */
678 iwl_trans_write_mem(trans
, trans_pcie
->scd_base_addr
+
679 SCD_CONTEXT_MEM_LOWER_BOUND
,
682 iwl_write_prph(trans
, SCD_DRAM_BASE_ADDR
,
683 trans_pcie
->scd_bc_tbls
.dma
>> 10);
685 /* The chain extension of the SCD doesn't work well. This feature is
686 * enabled by default by the HW, so we need to disable it manually.
688 iwl_write_prph(trans
, SCD_CHAINEXT_EN
, 0);
690 iwl_trans_ac_txq_enable(trans
, trans_pcie
->cmd_queue
,
691 trans_pcie
->cmd_fifo
);
693 /* Activate all Tx DMA/FIFO channels */
694 iwl_pcie_txq_set_sched(trans
, IWL_MASK(0, 7));
696 /* Enable DMA channel */
697 for (chan
= 0; chan
< FH_TCSR_CHNL_NUM
; chan
++)
698 iwl_write_direct32(trans
, FH_TCSR_CHNL_TX_CONFIG_REG(chan
),
699 FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE
|
700 FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE
);
702 /* Update FH chicken bits */
703 reg_val
= iwl_read_direct32(trans
, FH_TX_CHICKEN_BITS_REG
);
704 iwl_write_direct32(trans
, FH_TX_CHICKEN_BITS_REG
,
705 reg_val
| FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN
);
707 /* Enable L1-Active */
708 iwl_clear_bits_prph(trans
, APMG_PCIDEV_STT_REG
,
709 APMG_PCIDEV_STT_VAL_L1_ACT_DIS
);
712 void iwl_trans_pcie_tx_reset(struct iwl_trans
*trans
)
714 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
717 for (txq_id
= 0; txq_id
< trans
->cfg
->base_params
->num_of_queues
;
719 struct iwl_txq
*txq
= &trans_pcie
->txq
[txq_id
];
721 iwl_write_direct32(trans
, FH_MEM_CBBC_QUEUE(txq_id
),
722 txq
->q
.dma_addr
>> 8);
723 iwl_pcie_txq_unmap(trans
, txq_id
);
725 txq
->q
.write_ptr
= 0;
728 /* Tell NIC where to find the "keep warm" buffer */
729 iwl_write_direct32(trans
, FH_KW_MEM_ADDR_REG
,
730 trans_pcie
->kw
.dma
>> 4);
732 iwl_pcie_tx_start(trans
, trans_pcie
->scd_base_addr
);
736 * iwl_pcie_tx_stop - Stop all Tx DMA channels
738 int iwl_pcie_tx_stop(struct iwl_trans
*trans
)
740 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
744 /* Turn off all Tx DMA fifos */
745 spin_lock_irqsave(&trans_pcie
->irq_lock
, flags
);
747 iwl_pcie_txq_set_sched(trans
, 0);
749 /* Stop each Tx DMA channel, and wait for it to be idle */
750 for (ch
= 0; ch
< FH_TCSR_CHNL_NUM
; ch
++) {
751 iwl_write_direct32(trans
,
752 FH_TCSR_CHNL_TX_CONFIG_REG(ch
), 0x0);
753 ret
= iwl_poll_direct_bit(trans
, FH_TSSR_TX_STATUS_REG
,
754 FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch
), 1000);
757 "Failing on timeout while stopping DMA channel %d [0x%08x]\n",
759 iwl_read_direct32(trans
,
760 FH_TSSR_TX_STATUS_REG
));
762 spin_unlock_irqrestore(&trans_pcie
->irq_lock
, flags
);
764 if (!trans_pcie
->txq
) {
766 "Stopping tx queues that aren't allocated...\n");
770 /* Unmap DMA from host system and free skb's */
771 for (txq_id
= 0; txq_id
< trans
->cfg
->base_params
->num_of_queues
;
773 iwl_pcie_txq_unmap(trans
, txq_id
);
779 * iwl_trans_tx_free - Free TXQ Context
781 * Destroy all TX DMA queues and structures
783 void iwl_pcie_tx_free(struct iwl_trans
*trans
)
786 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
789 if (trans_pcie
->txq
) {
791 txq_id
< trans
->cfg
->base_params
->num_of_queues
; txq_id
++)
792 iwl_pcie_txq_free(trans
, txq_id
);
795 kfree(trans_pcie
->txq
);
796 trans_pcie
->txq
= NULL
;
798 iwl_pcie_free_dma_ptr(trans
, &trans_pcie
->kw
);
800 iwl_pcie_free_dma_ptr(trans
, &trans_pcie
->scd_bc_tbls
);
804 * iwl_pcie_tx_alloc - allocate TX context
805 * Allocate all Tx DMA structures and initialize them
807 static int iwl_pcie_tx_alloc(struct iwl_trans
*trans
)
810 int txq_id
, slots_num
;
811 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
813 u16 scd_bc_tbls_size
= trans
->cfg
->base_params
->num_of_queues
*
814 sizeof(struct iwlagn_scd_bc_tbl
);
816 /*It is not allowed to alloc twice, so warn when this happens.
817 * We cannot rely on the previous allocation, so free and fail */
818 if (WARN_ON(trans_pcie
->txq
)) {
823 ret
= iwl_pcie_alloc_dma_ptr(trans
, &trans_pcie
->scd_bc_tbls
,
826 IWL_ERR(trans
, "Scheduler BC Table allocation failed\n");
830 /* Alloc keep-warm buffer */
831 ret
= iwl_pcie_alloc_dma_ptr(trans
, &trans_pcie
->kw
, IWL_KW_SIZE
);
833 IWL_ERR(trans
, "Keep Warm allocation failed\n");
837 trans_pcie
->txq
= kcalloc(trans
->cfg
->base_params
->num_of_queues
,
838 sizeof(struct iwl_txq
), GFP_KERNEL
);
839 if (!trans_pcie
->txq
) {
840 IWL_ERR(trans
, "Not enough memory for txq\n");
845 /* Alloc and init all Tx queues, including the command queue (#4/#9) */
846 for (txq_id
= 0; txq_id
< trans
->cfg
->base_params
->num_of_queues
;
848 slots_num
= (txq_id
== trans_pcie
->cmd_queue
) ?
849 TFD_CMD_SLOTS
: TFD_TX_CMD_SLOTS
;
850 ret
= iwl_pcie_txq_alloc(trans
, &trans_pcie
->txq
[txq_id
],
853 IWL_ERR(trans
, "Tx %d queue alloc failed\n", txq_id
);
861 iwl_pcie_tx_free(trans
);
865 int iwl_pcie_tx_init(struct iwl_trans
*trans
)
867 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
869 int txq_id
, slots_num
;
873 if (!trans_pcie
->txq
) {
874 ret
= iwl_pcie_tx_alloc(trans
);
880 spin_lock_irqsave(&trans_pcie
->irq_lock
, flags
);
882 /* Turn off all Tx DMA fifos */
883 iwl_write_prph(trans
, SCD_TXFACT
, 0);
885 /* Tell NIC where to find the "keep warm" buffer */
886 iwl_write_direct32(trans
, FH_KW_MEM_ADDR_REG
,
887 trans_pcie
->kw
.dma
>> 4);
889 spin_unlock_irqrestore(&trans_pcie
->irq_lock
, flags
);
891 /* Alloc and init all Tx queues, including the command queue (#4/#9) */
892 for (txq_id
= 0; txq_id
< trans
->cfg
->base_params
->num_of_queues
;
894 slots_num
= (txq_id
== trans_pcie
->cmd_queue
) ?
895 TFD_CMD_SLOTS
: TFD_TX_CMD_SLOTS
;
896 ret
= iwl_pcie_txq_init(trans
, &trans_pcie
->txq
[txq_id
],
899 IWL_ERR(trans
, "Tx %d queue init failed\n", txq_id
);
906 /*Upon error, free only if we allocated something */
908 iwl_pcie_tx_free(trans
);
912 static inline void iwl_pcie_txq_progress(struct iwl_trans_pcie
*trans_pcie
,
915 if (!trans_pcie
->wd_timeout
)
919 * if empty delete timer, otherwise move timer forward
920 * since we're making progress on this queue
922 if (txq
->q
.read_ptr
== txq
->q
.write_ptr
)
923 del_timer(&txq
->stuck_timer
);
925 mod_timer(&txq
->stuck_timer
, jiffies
+ trans_pcie
->wd_timeout
);
928 /* Frees buffers until index _not_ inclusive */
929 void iwl_trans_pcie_reclaim(struct iwl_trans
*trans
, int txq_id
, int ssn
,
930 struct sk_buff_head
*skbs
)
932 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
933 struct iwl_txq
*txq
= &trans_pcie
->txq
[txq_id
];
934 /* n_bd is usually 256 => n_bd - 1 = 0xff */
935 int tfd_num
= ssn
& (txq
->q
.n_bd
- 1);
936 struct iwl_queue
*q
= &txq
->q
;
939 /* This function is not meant to release cmd queue*/
940 if (WARN_ON(txq_id
== trans_pcie
->cmd_queue
))
943 spin_lock_bh(&txq
->lock
);
946 IWL_DEBUG_TX_QUEUES(trans
, "Q %d inactive - ignoring idx %d\n",
951 if (txq
->q
.read_ptr
== tfd_num
)
954 IWL_DEBUG_TX_REPLY(trans
, "[Q %d] %d -> %d (%d)\n",
955 txq_id
, txq
->q
.read_ptr
, tfd_num
, ssn
);
957 /*Since we free until index _not_ inclusive, the one before index is
958 * the last we will free. This one must be used */
959 last_to_free
= iwl_queue_dec_wrap(tfd_num
, q
->n_bd
);
961 if (!iwl_queue_used(q
, last_to_free
)) {
963 "%s: Read index for DMA queue txq id (%d), last_to_free %d is out of range [0-%d] %d %d.\n",
964 __func__
, txq_id
, last_to_free
, q
->n_bd
,
965 q
->write_ptr
, q
->read_ptr
);
969 if (WARN_ON(!skb_queue_empty(skbs
)))
973 q
->read_ptr
!= tfd_num
;
974 q
->read_ptr
= iwl_queue_inc_wrap(q
->read_ptr
, q
->n_bd
)) {
976 if (WARN_ON_ONCE(txq
->entries
[txq
->q
.read_ptr
].skb
== NULL
))
979 __skb_queue_tail(skbs
, txq
->entries
[txq
->q
.read_ptr
].skb
);
981 txq
->entries
[txq
->q
.read_ptr
].skb
= NULL
;
983 iwl_pcie_txq_inval_byte_cnt_tbl(trans
, txq
);
985 iwl_pcie_txq_free_tfd(trans
, txq
);
988 iwl_pcie_txq_progress(trans_pcie
, txq
);
990 if (iwl_queue_space(&txq
->q
) > txq
->q
.low_mark
)
991 iwl_wake_queue(trans
, txq
);
993 spin_unlock_bh(&txq
->lock
);
997 * iwl_pcie_cmdq_reclaim - Reclaim TX command queue entries already Tx'd
999 * When FW advances 'R' index, all entries between old and new 'R' index
1000 * need to be reclaimed. As result, some free space forms. If there is
1001 * enough free space (> low mark), wake the stack that feeds us.
1003 static void iwl_pcie_cmdq_reclaim(struct iwl_trans
*trans
, int txq_id
, int idx
)
1005 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
1006 struct iwl_txq
*txq
= &trans_pcie
->txq
[txq_id
];
1007 struct iwl_queue
*q
= &txq
->q
;
1010 lockdep_assert_held(&txq
->lock
);
1012 if ((idx
>= q
->n_bd
) || (!iwl_queue_used(q
, idx
))) {
1014 "%s: Read index for DMA queue txq id (%d), index %d is out of range [0-%d] %d %d.\n",
1015 __func__
, txq_id
, idx
, q
->n_bd
,
1016 q
->write_ptr
, q
->read_ptr
);
1020 for (idx
= iwl_queue_inc_wrap(idx
, q
->n_bd
); q
->read_ptr
!= idx
;
1021 q
->read_ptr
= iwl_queue_inc_wrap(q
->read_ptr
, q
->n_bd
)) {
1024 IWL_ERR(trans
, "HCMD skipped: index (%d) %d %d\n",
1025 idx
, q
->write_ptr
, q
->read_ptr
);
1026 iwl_op_mode_nic_error(trans
->op_mode
);
1030 iwl_pcie_txq_progress(trans_pcie
, txq
);
1033 static int iwl_pcie_txq_set_ratid_map(struct iwl_trans
*trans
, u16 ra_tid
,
1036 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
1041 scd_q2ratid
= ra_tid
& SCD_QUEUE_RA_TID_MAP_RATID_MSK
;
1043 tbl_dw_addr
= trans_pcie
->scd_base_addr
+
1044 SCD_TRANS_TBL_OFFSET_QUEUE(txq_id
);
1046 tbl_dw
= iwl_trans_read_mem32(trans
, tbl_dw_addr
);
1049 tbl_dw
= (scd_q2ratid
<< 16) | (tbl_dw
& 0x0000FFFF);
1051 tbl_dw
= scd_q2ratid
| (tbl_dw
& 0xFFFF0000);
1053 iwl_trans_write_mem32(trans
, tbl_dw_addr
, tbl_dw
);
1058 static inline void iwl_pcie_txq_set_inactive(struct iwl_trans
*trans
,
1061 /* Simply stop the queue, but don't change any configuration;
1062 * the SCD_ACT_EN bit is the write-enable mask for the ACTIVE bit. */
1063 iwl_write_prph(trans
,
1064 SCD_QUEUE_STATUS_BITS(txq_id
),
1065 (0 << SCD_QUEUE_STTS_REG_POS_ACTIVE
)|
1066 (1 << SCD_QUEUE_STTS_REG_POS_SCD_ACT_EN
));
1069 /* Receiver address (actually, Rx station's index into station table),
1070 * combined with Traffic ID (QOS priority), in format used by Tx Scheduler */
1071 #define BUILD_RAxTID(sta_id, tid) (((sta_id) << 4) + (tid))
1073 void iwl_trans_pcie_txq_enable(struct iwl_trans
*trans
, int txq_id
, int fifo
,
1074 int sta_id
, int tid
, int frame_limit
, u16 ssn
)
1076 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
1078 if (test_and_set_bit(txq_id
, trans_pcie
->queue_used
))
1079 WARN_ONCE(1, "queue %d already used - expect issues", txq_id
);
1081 /* Stop this Tx queue before configuring it */
1082 iwl_pcie_txq_set_inactive(trans
, txq_id
);
1084 /* Set this queue as a chain-building queue unless it is CMD queue */
1085 if (txq_id
!= trans_pcie
->cmd_queue
)
1086 iwl_set_bits_prph(trans
, SCD_QUEUECHAIN_SEL
, BIT(txq_id
));
1088 /* If this queue is mapped to a certain station: it is an AGG queue */
1090 u16 ra_tid
= BUILD_RAxTID(sta_id
, tid
);
1092 /* Map receiver-address / traffic-ID to this queue */
1093 iwl_pcie_txq_set_ratid_map(trans
, ra_tid
, txq_id
);
1095 /* enable aggregations for the queue */
1096 iwl_set_bits_prph(trans
, SCD_AGGR_SEL
, BIT(txq_id
));
1097 trans_pcie
->txq
[txq_id
].ampdu
= true;
1100 * disable aggregations for the queue, this will also make the
1101 * ra_tid mapping configuration irrelevant since it is now a
1104 iwl_clear_bits_prph(trans
, SCD_AGGR_SEL
, BIT(txq_id
));
1106 ssn
= trans_pcie
->txq
[txq_id
].q
.read_ptr
;
1109 /* Place first TFD at index corresponding to start sequence number.
1110 * Assumes that ssn_idx is valid (!= 0xFFF) */
1111 trans_pcie
->txq
[txq_id
].q
.read_ptr
= (ssn
& 0xff);
1112 trans_pcie
->txq
[txq_id
].q
.write_ptr
= (ssn
& 0xff);
1114 iwl_write_direct32(trans
, HBUS_TARG_WRPTR
,
1115 (ssn
& 0xff) | (txq_id
<< 8));
1116 iwl_write_prph(trans
, SCD_QUEUE_RDPTR(txq_id
), ssn
);
1118 /* Set up Tx window size and frame limit for this queue */
1119 iwl_trans_write_mem32(trans
, trans_pcie
->scd_base_addr
+
1120 SCD_CONTEXT_QUEUE_OFFSET(txq_id
), 0);
1121 iwl_trans_write_mem32(trans
, trans_pcie
->scd_base_addr
+
1122 SCD_CONTEXT_QUEUE_OFFSET(txq_id
) + sizeof(u32
),
1123 ((frame_limit
<< SCD_QUEUE_CTX_REG2_WIN_SIZE_POS
) &
1124 SCD_QUEUE_CTX_REG2_WIN_SIZE_MSK
) |
1125 ((frame_limit
<< SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS
) &
1126 SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK
));
1128 /* Set up Status area in SRAM, map to Tx DMA/FIFO, activate the queue */
1129 iwl_write_prph(trans
, SCD_QUEUE_STATUS_BITS(txq_id
),
1130 (1 << SCD_QUEUE_STTS_REG_POS_ACTIVE
) |
1131 (fifo
<< SCD_QUEUE_STTS_REG_POS_TXF
) |
1132 (1 << SCD_QUEUE_STTS_REG_POS_WSL
) |
1133 SCD_QUEUE_STTS_REG_MSK
);
1134 trans_pcie
->txq
[txq_id
].active
= true;
1135 IWL_DEBUG_TX_QUEUES(trans
, "Activate queue %d on FIFO %d WrPtr: %d\n",
1136 txq_id
, fifo
, ssn
& 0xff);
1139 void iwl_trans_pcie_txq_disable(struct iwl_trans
*trans
, int txq_id
)
1141 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
1142 u32 stts_addr
= trans_pcie
->scd_base_addr
+
1143 SCD_TX_STTS_QUEUE_OFFSET(txq_id
);
1144 static const u32 zero_val
[4] = {};
1146 if (!test_and_clear_bit(txq_id
, trans_pcie
->queue_used
)) {
1147 WARN_ONCE(1, "queue %d not used", txq_id
);
1151 iwl_pcie_txq_set_inactive(trans
, txq_id
);
1153 iwl_trans_write_mem(trans
, stts_addr
, (void *)zero_val
,
1154 ARRAY_SIZE(zero_val
));
1156 iwl_pcie_txq_unmap(trans
, txq_id
);
1157 trans_pcie
->txq
[txq_id
].ampdu
= false;
1159 IWL_DEBUG_TX_QUEUES(trans
, "Deactivate queue %d\n", txq_id
);
1162 /*************** HOST COMMAND QUEUE FUNCTIONS *****/
1165 * iwl_pcie_enqueue_hcmd - enqueue a uCode command
1166 * @priv: device private data point
1167 * @cmd: a pointer to the ucode command structure
1169 * The function returns < 0 values to indicate the operation
1170 * failed. On success, it returns the index (>= 0) of command in the
1173 static int iwl_pcie_enqueue_hcmd(struct iwl_trans
*trans
,
1174 struct iwl_host_cmd
*cmd
)
1176 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
1177 struct iwl_txq
*txq
= &trans_pcie
->txq
[trans_pcie
->cmd_queue
];
1178 struct iwl_queue
*q
= &txq
->q
;
1179 struct iwl_device_cmd
*out_cmd
;
1180 struct iwl_cmd_meta
*out_meta
;
1181 void *dup_buf
= NULL
;
1182 dma_addr_t phys_addr
;
1184 u16 copy_size
, cmd_size
, scratch_size
;
1185 bool had_nocopy
= false;
1188 const u8
*cmddata
[IWL_MAX_CMD_TBS_PER_TFD
];
1189 u16 cmdlen
[IWL_MAX_CMD_TBS_PER_TFD
];
1191 copy_size
= sizeof(out_cmd
->hdr
);
1192 cmd_size
= sizeof(out_cmd
->hdr
);
1194 /* need one for the header if the first is NOCOPY */
1195 BUILD_BUG_ON(IWL_MAX_CMD_TBS_PER_TFD
> IWL_NUM_OF_TBS
- 1);
1197 for (i
= 0; i
< IWL_MAX_CMD_TBS_PER_TFD
; i
++) {
1198 cmddata
[i
] = cmd
->data
[i
];
1199 cmdlen
[i
] = cmd
->len
[i
];
1204 /* need at least IWL_HCMD_SCRATCHBUF_SIZE copied */
1205 if (copy_size
< IWL_HCMD_SCRATCHBUF_SIZE
) {
1206 int copy
= IWL_HCMD_SCRATCHBUF_SIZE
- copy_size
;
1208 if (copy
> cmdlen
[i
])
1215 if (cmd
->dataflags
[i
] & IWL_HCMD_DFL_NOCOPY
) {
1217 if (WARN_ON(cmd
->dataflags
[i
] & IWL_HCMD_DFL_DUP
)) {
1221 } else if (cmd
->dataflags
[i
] & IWL_HCMD_DFL_DUP
) {
1223 * This is also a chunk that isn't copied
1224 * to the static buffer so set had_nocopy.
1228 /* only allowed once */
1229 if (WARN_ON(dup_buf
)) {
1234 dup_buf
= kmemdup(cmddata
[i
], cmdlen
[i
],
1239 /* NOCOPY must not be followed by normal! */
1240 if (WARN_ON(had_nocopy
)) {
1244 copy_size
+= cmdlen
[i
];
1246 cmd_size
+= cmd
->len
[i
];
1250 * If any of the command structures end up being larger than
1251 * the TFD_MAX_PAYLOAD_SIZE and they aren't dynamically
1252 * allocated into separate TFDs, then we will need to
1253 * increase the size of the buffers.
1255 if (WARN(copy_size
> TFD_MAX_PAYLOAD_SIZE
,
1256 "Command %s (%#x) is too large (%d bytes)\n",
1257 get_cmd_string(trans_pcie
, cmd
->id
), cmd
->id
, copy_size
)) {
1262 spin_lock_bh(&txq
->lock
);
1264 if (iwl_queue_space(q
) < ((cmd
->flags
& CMD_ASYNC
) ? 2 : 1)) {
1265 spin_unlock_bh(&txq
->lock
);
1267 IWL_ERR(trans
, "No space in command queue\n");
1268 iwl_op_mode_cmd_queue_full(trans
->op_mode
);
1273 idx
= get_cmd_index(q
, q
->write_ptr
);
1274 out_cmd
= txq
->entries
[idx
].cmd
;
1275 out_meta
= &txq
->entries
[idx
].meta
;
1277 memset(out_meta
, 0, sizeof(*out_meta
)); /* re-initialize to NULL */
1278 if (cmd
->flags
& CMD_WANT_SKB
)
1279 out_meta
->source
= cmd
;
1281 /* set up the header */
1283 out_cmd
->hdr
.cmd
= cmd
->id
;
1284 out_cmd
->hdr
.flags
= 0;
1285 out_cmd
->hdr
.sequence
=
1286 cpu_to_le16(QUEUE_TO_SEQ(trans_pcie
->cmd_queue
) |
1287 INDEX_TO_SEQ(q
->write_ptr
));
1289 /* and copy the data that needs to be copied */
1290 cmd_pos
= offsetof(struct iwl_device_cmd
, payload
);
1291 copy_size
= sizeof(out_cmd
->hdr
);
1292 for (i
= 0; i
< IWL_MAX_CMD_TBS_PER_TFD
; i
++) {
1298 /* need at least IWL_HCMD_SCRATCHBUF_SIZE copied */
1299 if (copy_size
< IWL_HCMD_SCRATCHBUF_SIZE
) {
1300 copy
= IWL_HCMD_SCRATCHBUF_SIZE
- copy_size
;
1302 if (copy
> cmd
->len
[i
])
1306 /* copy everything if not nocopy/dup */
1307 if (!(cmd
->dataflags
[i
] & (IWL_HCMD_DFL_NOCOPY
|
1312 memcpy((u8
*)out_cmd
+ cmd_pos
, cmd
->data
[i
], copy
);
1319 "Sending command %s (#%x), seq: 0x%04X, %d bytes at %d[%d]:%d\n",
1320 get_cmd_string(trans_pcie
, out_cmd
->hdr
.cmd
),
1321 out_cmd
->hdr
.cmd
, le16_to_cpu(out_cmd
->hdr
.sequence
),
1322 cmd_size
, q
->write_ptr
, idx
, trans_pcie
->cmd_queue
);
1324 /* start the TFD with the scratchbuf */
1325 scratch_size
= min_t(int, copy_size
, IWL_HCMD_SCRATCHBUF_SIZE
);
1326 memcpy(&txq
->scratchbufs
[q
->write_ptr
], &out_cmd
->hdr
, scratch_size
);
1327 iwl_pcie_txq_build_tfd(trans
, txq
,
1328 iwl_pcie_get_scratchbuf_dma(txq
, q
->write_ptr
),
1331 /* map first command fragment, if any remains */
1332 if (copy_size
> scratch_size
) {
1333 phys_addr
= dma_map_single(trans
->dev
,
1334 ((u8
*)&out_cmd
->hdr
) + scratch_size
,
1335 copy_size
- scratch_size
,
1337 if (dma_mapping_error(trans
->dev
, phys_addr
)) {
1338 iwl_pcie_tfd_unmap(trans
, out_meta
,
1339 &txq
->tfds
[q
->write_ptr
]);
1344 iwl_pcie_txq_build_tfd(trans
, txq
, phys_addr
,
1345 copy_size
- scratch_size
, 0);
1348 /* map the remaining (adjusted) nocopy/dup fragments */
1349 for (i
= 0; i
< IWL_MAX_CMD_TBS_PER_TFD
; i
++) {
1350 const void *data
= cmddata
[i
];
1354 if (!(cmd
->dataflags
[i
] & (IWL_HCMD_DFL_NOCOPY
|
1357 if (cmd
->dataflags
[i
] & IWL_HCMD_DFL_DUP
)
1359 phys_addr
= dma_map_single(trans
->dev
, (void *)data
,
1360 cmdlen
[i
], DMA_TO_DEVICE
);
1361 if (dma_mapping_error(trans
->dev
, phys_addr
)) {
1362 iwl_pcie_tfd_unmap(trans
, out_meta
,
1363 &txq
->tfds
[q
->write_ptr
]);
1368 iwl_pcie_txq_build_tfd(trans
, txq
, phys_addr
, cmdlen
[i
], 0);
1371 out_meta
->flags
= cmd
->flags
;
1372 if (WARN_ON_ONCE(txq
->entries
[idx
].free_buf
))
1373 kfree(txq
->entries
[idx
].free_buf
);
1374 txq
->entries
[idx
].free_buf
= dup_buf
;
1376 txq
->need_update
= 1;
1378 trace_iwlwifi_dev_hcmd(trans
->dev
, cmd
, cmd_size
, &out_cmd
->hdr
);
1380 /* start timer if queue currently empty */
1381 if (q
->read_ptr
== q
->write_ptr
&& trans_pcie
->wd_timeout
)
1382 mod_timer(&txq
->stuck_timer
, jiffies
+ trans_pcie
->wd_timeout
);
1384 /* Increment and update queue's write index */
1385 q
->write_ptr
= iwl_queue_inc_wrap(q
->write_ptr
, q
->n_bd
);
1386 iwl_pcie_txq_inc_wr_ptr(trans
, txq
);
1389 spin_unlock_bh(&txq
->lock
);
1397 * iwl_pcie_hcmd_complete - Pull unused buffers off the queue and reclaim them
1398 * @rxb: Rx buffer to reclaim
1399 * @handler_status: return value of the handler of the command
1400 * (put in setup_rx_handlers)
1402 * If an Rx buffer has an async callback associated with it the callback
1403 * will be executed. The attached skb (if present) will only be freed
1404 * if the callback returns 1
1406 void iwl_pcie_hcmd_complete(struct iwl_trans
*trans
,
1407 struct iwl_rx_cmd_buffer
*rxb
, int handler_status
)
1409 struct iwl_rx_packet
*pkt
= rxb_addr(rxb
);
1410 u16 sequence
= le16_to_cpu(pkt
->hdr
.sequence
);
1411 int txq_id
= SEQ_TO_QUEUE(sequence
);
1412 int index
= SEQ_TO_INDEX(sequence
);
1414 struct iwl_device_cmd
*cmd
;
1415 struct iwl_cmd_meta
*meta
;
1416 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
1417 struct iwl_txq
*txq
= &trans_pcie
->txq
[trans_pcie
->cmd_queue
];
1419 /* If a Tx command is being handled and it isn't in the actual
1420 * command queue then there a command routing bug has been introduced
1421 * in the queue management code. */
1422 if (WARN(txq_id
!= trans_pcie
->cmd_queue
,
1423 "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n",
1424 txq_id
, trans_pcie
->cmd_queue
, sequence
,
1425 trans_pcie
->txq
[trans_pcie
->cmd_queue
].q
.read_ptr
,
1426 trans_pcie
->txq
[trans_pcie
->cmd_queue
].q
.write_ptr
)) {
1427 iwl_print_hex_error(trans
, pkt
, 32);
1431 spin_lock_bh(&txq
->lock
);
1433 cmd_index
= get_cmd_index(&txq
->q
, index
);
1434 cmd
= txq
->entries
[cmd_index
].cmd
;
1435 meta
= &txq
->entries
[cmd_index
].meta
;
1437 iwl_pcie_tfd_unmap(trans
, meta
, &txq
->tfds
[index
]);
1439 /* Input error checking is done when commands are added to queue. */
1440 if (meta
->flags
& CMD_WANT_SKB
) {
1441 struct page
*p
= rxb_steal_page(rxb
);
1443 meta
->source
->resp_pkt
= pkt
;
1444 meta
->source
->_rx_page_addr
= (unsigned long)page_address(p
);
1445 meta
->source
->_rx_page_order
= trans_pcie
->rx_page_order
;
1446 meta
->source
->handler_status
= handler_status
;
1449 iwl_pcie_cmdq_reclaim(trans
, txq_id
, index
);
1451 if (!(meta
->flags
& CMD_ASYNC
)) {
1452 if (!test_bit(STATUS_HCMD_ACTIVE
, &trans_pcie
->status
)) {
1454 "HCMD_ACTIVE already clear for command %s\n",
1455 get_cmd_string(trans_pcie
, cmd
->hdr
.cmd
));
1457 clear_bit(STATUS_HCMD_ACTIVE
, &trans_pcie
->status
);
1458 IWL_DEBUG_INFO(trans
, "Clearing HCMD_ACTIVE for command %s\n",
1459 get_cmd_string(trans_pcie
, cmd
->hdr
.cmd
));
1460 wake_up(&trans_pcie
->wait_command_queue
);
1465 spin_unlock_bh(&txq
->lock
);
1468 #define HOST_COMPLETE_TIMEOUT (2 * HZ)
1469 #define COMMAND_POKE_TIMEOUT (HZ / 10)
1471 static int iwl_pcie_send_hcmd_async(struct iwl_trans
*trans
,
1472 struct iwl_host_cmd
*cmd
)
1474 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
1477 /* An asynchronous command can not expect an SKB to be set. */
1478 if (WARN_ON(cmd
->flags
& CMD_WANT_SKB
))
1481 ret
= iwl_pcie_enqueue_hcmd(trans
, cmd
);
1484 "Error sending %s: enqueue_hcmd failed: %d\n",
1485 get_cmd_string(trans_pcie
, cmd
->id
), ret
);
1491 static int iwl_pcie_send_hcmd_sync(struct iwl_trans
*trans
,
1492 struct iwl_host_cmd
*cmd
)
1494 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
1497 int timeout
= HOST_COMPLETE_TIMEOUT
;
1499 IWL_DEBUG_INFO(trans
, "Attempting to send sync command %s\n",
1500 get_cmd_string(trans_pcie
, cmd
->id
));
1502 if (WARN(test_and_set_bit(STATUS_HCMD_ACTIVE
,
1503 &trans_pcie
->status
),
1504 "Command %s: a command is already active!\n",
1505 get_cmd_string(trans_pcie
, cmd
->id
)))
1508 IWL_DEBUG_INFO(trans
, "Setting HCMD_ACTIVE for command %s\n",
1509 get_cmd_string(trans_pcie
, cmd
->id
));
1511 cmd_idx
= iwl_pcie_enqueue_hcmd(trans
, cmd
);
1514 clear_bit(STATUS_HCMD_ACTIVE
, &trans_pcie
->status
);
1516 "Error sending %s: enqueue_hcmd failed: %d\n",
1517 get_cmd_string(trans_pcie
, cmd
->id
), ret
);
1521 while (timeout
> 0) {
1522 unsigned long flags
;
1524 timeout
-= COMMAND_POKE_TIMEOUT
;
1525 ret
= wait_event_timeout(trans_pcie
->wait_command_queue
,
1526 !test_bit(STATUS_HCMD_ACTIVE
,
1527 &trans_pcie
->status
),
1528 COMMAND_POKE_TIMEOUT
);
1531 /* poke the device - it may have lost the command */
1532 if (iwl_trans_grab_nic_access(trans
, true, &flags
)) {
1533 iwl_trans_release_nic_access(trans
, &flags
);
1534 IWL_DEBUG_INFO(trans
,
1535 "Tried to wake NIC for command %s\n",
1536 get_cmd_string(trans_pcie
, cmd
->id
));
1538 IWL_ERR(trans
, "Failed to poke NIC for command %s\n",
1539 get_cmd_string(trans_pcie
, cmd
->id
));
1545 if (test_bit(STATUS_HCMD_ACTIVE
, &trans_pcie
->status
)) {
1546 struct iwl_txq
*txq
=
1547 &trans_pcie
->txq
[trans_pcie
->cmd_queue
];
1548 struct iwl_queue
*q
= &txq
->q
;
1551 "Error sending %s: time out after %dms.\n",
1552 get_cmd_string(trans_pcie
, cmd
->id
),
1553 jiffies_to_msecs(HOST_COMPLETE_TIMEOUT
));
1556 "Current CMD queue read_ptr %d write_ptr %d\n",
1557 q
->read_ptr
, q
->write_ptr
);
1559 clear_bit(STATUS_HCMD_ACTIVE
, &trans_pcie
->status
);
1560 IWL_DEBUG_INFO(trans
,
1561 "Clearing HCMD_ACTIVE for command %s\n",
1562 get_cmd_string(trans_pcie
, cmd
->id
));
1565 iwl_op_mode_nic_error(trans
->op_mode
);
1571 if (test_bit(STATUS_FW_ERROR
, &trans_pcie
->status
)) {
1572 IWL_ERR(trans
, "FW error in SYNC CMD %s\n",
1573 get_cmd_string(trans_pcie
, cmd
->id
));
1579 if (!(cmd
->flags
& CMD_SEND_IN_RFKILL
) &&
1580 test_bit(STATUS_RFKILL
, &trans_pcie
->status
)) {
1581 IWL_DEBUG_RF_KILL(trans
, "RFKILL in SYNC CMD... no rsp\n");
1586 if ((cmd
->flags
& CMD_WANT_SKB
) && !cmd
->resp_pkt
) {
1587 IWL_ERR(trans
, "Error: Response NULL in '%s'\n",
1588 get_cmd_string(trans_pcie
, cmd
->id
));
1596 if (cmd
->flags
& CMD_WANT_SKB
) {
1598 * Cancel the CMD_WANT_SKB flag for the cmd in the
1599 * TX cmd queue. Otherwise in case the cmd comes
1600 * in later, it will possibly set an invalid
1601 * address (cmd->meta.source).
1603 trans_pcie
->txq
[trans_pcie
->cmd_queue
].
1604 entries
[cmd_idx
].meta
.flags
&= ~CMD_WANT_SKB
;
1607 if (cmd
->resp_pkt
) {
1609 cmd
->resp_pkt
= NULL
;
1615 int iwl_trans_pcie_send_hcmd(struct iwl_trans
*trans
, struct iwl_host_cmd
*cmd
)
1617 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
1619 if (test_bit(STATUS_FW_ERROR
, &trans_pcie
->status
))
1622 if (!(cmd
->flags
& CMD_SEND_IN_RFKILL
) &&
1623 test_bit(STATUS_RFKILL
, &trans_pcie
->status
)) {
1624 IWL_DEBUG_RF_KILL(trans
, "Dropping CMD 0x%x: RF KILL\n",
1629 if (cmd
->flags
& CMD_ASYNC
)
1630 return iwl_pcie_send_hcmd_async(trans
, cmd
);
1632 /* We still can fail on RFKILL that can be asserted while we wait */
1633 return iwl_pcie_send_hcmd_sync(trans
, cmd
);
1636 int iwl_trans_pcie_tx(struct iwl_trans
*trans
, struct sk_buff
*skb
,
1637 struct iwl_device_cmd
*dev_cmd
, int txq_id
)
1639 struct iwl_trans_pcie
*trans_pcie
= IWL_TRANS_GET_PCIE_TRANS(trans
);
1640 struct ieee80211_hdr
*hdr
= (struct ieee80211_hdr
*)skb
->data
;
1641 struct iwl_tx_cmd
*tx_cmd
= (struct iwl_tx_cmd
*)dev_cmd
->payload
;
1642 struct iwl_cmd_meta
*out_meta
;
1643 struct iwl_txq
*txq
;
1644 struct iwl_queue
*q
;
1645 dma_addr_t tb0_phys
, tb1_phys
, scratch_phys
;
1647 u16 len
, tb1_len
, tb2_len
;
1648 u8 wait_write_ptr
= 0;
1649 __le16 fc
= hdr
->frame_control
;
1650 u8 hdr_len
= ieee80211_hdrlen(fc
);
1653 txq
= &trans_pcie
->txq
[txq_id
];
1656 if (WARN_ONCE(!test_bit(txq_id
, trans_pcie
->queue_used
),
1657 "TX on unused queue %d\n", txq_id
))
1660 spin_lock(&txq
->lock
);
1662 /* In AGG mode, the index in the ring must correspond to the WiFi
1663 * sequence number. This is a HW requirements to help the SCD to parse
1665 * Check here that the packets are in the right place on the ring.
1667 wifi_seq
= IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr
->seq_ctrl
));
1668 WARN_ONCE(txq
->ampdu
&&
1669 (wifi_seq
& 0xff) != q
->write_ptr
,
1670 "Q: %d WiFi Seq %d tfdNum %d",
1671 txq_id
, wifi_seq
, q
->write_ptr
);
1673 /* Set up driver data for this TFD */
1674 txq
->entries
[q
->write_ptr
].skb
= skb
;
1675 txq
->entries
[q
->write_ptr
].cmd
= dev_cmd
;
1677 dev_cmd
->hdr
.cmd
= REPLY_TX
;
1678 dev_cmd
->hdr
.sequence
=
1679 cpu_to_le16((u16
)(QUEUE_TO_SEQ(txq_id
) |
1680 INDEX_TO_SEQ(q
->write_ptr
)));
1682 tb0_phys
= iwl_pcie_get_scratchbuf_dma(txq
, q
->write_ptr
);
1683 scratch_phys
= tb0_phys
+ sizeof(struct iwl_cmd_header
) +
1684 offsetof(struct iwl_tx_cmd
, scratch
);
1686 tx_cmd
->dram_lsb_ptr
= cpu_to_le32(scratch_phys
);
1687 tx_cmd
->dram_msb_ptr
= iwl_get_dma_hi_addr(scratch_phys
);
1689 /* Set up first empty entry in queue's array of Tx/cmd buffers */
1690 out_meta
= &txq
->entries
[q
->write_ptr
].meta
;
1693 * The second TB (tb1) points to the remainder of the TX command
1694 * and the 802.11 header - dword aligned size
1695 * (This calculation modifies the TX command, so do it before the
1696 * setup of the first TB)
1698 len
= sizeof(struct iwl_tx_cmd
) + sizeof(struct iwl_cmd_header
) +
1699 hdr_len
- IWL_HCMD_SCRATCHBUF_SIZE
;
1700 tb1_len
= ALIGN(len
, 4);
1702 /* Tell NIC about any 2-byte padding after MAC header */
1704 tx_cmd
->tx_flags
|= TX_CMD_FLG_MH_PAD_MSK
;
1706 /* The first TB points to the scratchbuf data - min_copy bytes */
1707 memcpy(&txq
->scratchbufs
[q
->write_ptr
], &dev_cmd
->hdr
,
1708 IWL_HCMD_SCRATCHBUF_SIZE
);
1709 iwl_pcie_txq_build_tfd(trans
, txq
, tb0_phys
,
1710 IWL_HCMD_SCRATCHBUF_SIZE
, 1);
1712 /* there must be data left over for TB1 or this code must be changed */
1713 BUILD_BUG_ON(sizeof(struct iwl_tx_cmd
) < IWL_HCMD_SCRATCHBUF_SIZE
);
1715 /* map the data for TB1 */
1716 tb1_addr
= ((u8
*)&dev_cmd
->hdr
) + IWL_HCMD_SCRATCHBUF_SIZE
;
1717 tb1_phys
= dma_map_single(trans
->dev
, tb1_addr
, tb1_len
, DMA_TO_DEVICE
);
1718 if (unlikely(dma_mapping_error(trans
->dev
, tb1_phys
)))
1720 iwl_pcie_txq_build_tfd(trans
, txq
, tb1_phys
, tb1_len
, 0);
1723 * Set up TFD's third entry to point directly to remainder
1724 * of skb, if any (802.11 null frames have no payload).
1726 tb2_len
= skb
->len
- hdr_len
;
1728 dma_addr_t tb2_phys
= dma_map_single(trans
->dev
,
1729 skb
->data
+ hdr_len
,
1730 tb2_len
, DMA_TO_DEVICE
);
1731 if (unlikely(dma_mapping_error(trans
->dev
, tb2_phys
))) {
1732 iwl_pcie_tfd_unmap(trans
, out_meta
,
1733 &txq
->tfds
[q
->write_ptr
]);
1736 iwl_pcie_txq_build_tfd(trans
, txq
, tb2_phys
, tb2_len
, 0);
1739 /* Set up entry for this TFD in Tx byte-count array */
1740 iwl_pcie_txq_update_byte_cnt_tbl(trans
, txq
, le16_to_cpu(tx_cmd
->len
));
1742 trace_iwlwifi_dev_tx(trans
->dev
, skb
,
1743 &txq
->tfds
[txq
->q
.write_ptr
],
1744 sizeof(struct iwl_tfd
),
1745 &dev_cmd
->hdr
, IWL_HCMD_SCRATCHBUF_SIZE
+ tb1_len
,
1746 skb
->data
+ hdr_len
, tb2_len
);
1747 trace_iwlwifi_dev_tx_data(trans
->dev
, skb
,
1748 skb
->data
+ hdr_len
, tb2_len
);
1750 if (!ieee80211_has_morefrags(fc
)) {
1751 txq
->need_update
= 1;
1754 txq
->need_update
= 0;
1757 /* start timer if queue currently empty */
1758 if (txq
->need_update
&& q
->read_ptr
== q
->write_ptr
&&
1759 trans_pcie
->wd_timeout
)
1760 mod_timer(&txq
->stuck_timer
, jiffies
+ trans_pcie
->wd_timeout
);
1762 /* Tell device the write index *just past* this latest filled TFD */
1763 q
->write_ptr
= iwl_queue_inc_wrap(q
->write_ptr
, q
->n_bd
);
1764 iwl_pcie_txq_inc_wr_ptr(trans
, txq
);
1767 * At this point the frame is "transmitted" successfully
1768 * and we will get a TX status notification eventually,
1769 * regardless of the value of ret. "ret" only indicates
1770 * whether or not we should update the write pointer.
1772 if (iwl_queue_space(q
) < q
->high_mark
) {
1773 if (wait_write_ptr
) {
1774 txq
->need_update
= 1;
1775 iwl_pcie_txq_inc_wr_ptr(trans
, txq
);
1777 iwl_stop_queue(trans
, txq
);
1780 spin_unlock(&txq
->lock
);
1783 spin_unlock(&txq
->lock
);