summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
blob: fa315d84e98eacdf4f58bf47863f9f0aa3cce712 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
/******************************************************************************
 *
 * Copyright(c) 2003 - 2015 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
 *
 * Portions of this file are derived from the ipw3945 project, as well
 * as portions of the ieee80211 subsystem header files.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 *  Intel Linux Wireless <linuxwifi@intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/
#ifndef __iwl_trans_int_pcie_h__
#define __iwl_trans_int_pcie_h__

#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/skbuff.h>
#include <linux/wait.h>
#include <linux/pci.h>
#include <linux/timer.h>
#include <linux/cpu.h>

#include "iwl-fh.h"
#include "iwl-csr.h"
#include "iwl-trans.h"
#include "iwl-debug.h"
#include "iwl-io.h"
#include "iwl-op-mode.h"

/* We need 2 entries for the TX command and header, and another one might
 * be needed for potential data in the SKB's head. The remaining ones can
 * be used for frags.
 */
#define IWL_PCIE_MAX_FRAGS(x) (x->max_tbs - 3)

/*
 * RX related structures and functions
 */
#define RX_NUM_QUEUES 1
#define RX_POST_REQ_ALLOC 2
#define RX_CLAIM_REQ_ALLOC 8
#define RX_PENDING_WATERMARK 16

struct iwl_host_cmd;

/*This file includes the declaration that are internal to the
 * trans_pcie layer */

/**
 * struct iwl_rx_mem_buffer
 * @page_dma: bus address of rxb page
 * @page: driver's pointer to the rxb page
 * @invalid: rxb is in driver ownership - not owned by HW
 * @vid: index of this rxb in the global table
 */
struct iwl_rx_mem_buffer {
	dma_addr_t page_dma;
	struct page *page;
	u16 vid;
	bool invalid;
	struct list_head list;
};

/**
 * struct isr_statistics - interrupt statistics
 *
 */
struct isr_statistics {
	u32 hw;
	u32 sw;
	u32 err_code;
	u32 sch;
	u32 alive;
	u32 rfkill;
	u32 ctkill;
	u32 wakeup;
	u32 rx;
	u32 tx;
	u32 unhandled;
};

/**
 * struct iwl_rxq - Rx queue
 * @id: queue index
 * @bd: driver's pointer to buffer of receive buffer descriptors (rbd).
 *	Address size is 32 bit in pre-9000 devices and 64 bit in 9000 devices.
 * @bd_dma: bus address of buffer of receive buffer descriptors (rbd)
 * @ubd: driver's pointer to buffer of used receive buffer descriptors (rbd)
 * @ubd_dma: physical address of buffer of used receive buffer descriptors (rbd)
 * @read: Shared index to newest available Rx buffer
 * @write: Shared index to oldest written Rx packet
 * @free_count: Number of pre-allocated buffers in rx_free
 * @used_count: Number of RBDs handled to allocator to use for allocation
 * @write_actual:
 * @rx_free: list of RBDs with allocated RB ready for use
 * @rx_used: list of RBDs with no RB attached
 * @need_update: flag to indicate we need to update read/write index
 * @rb_stts: driver's pointer to receive buffer status
 * @rb_stts_dma: bus address of receive buffer status
 * @lock:
 * @queue: actual rx queue. Not used for multi-rx queue.
 *
 * NOTE:  rx_free and rx_used are used as a FIFO for iwl_rx_mem_buffers
 */
struct iwl_rxq {
	int id;
	void *bd;
	dma_addr_t bd_dma;
	__le32 *used_bd;
	dma_addr_t used_bd_dma;
	u32 read;
	u32 write;
	u32 free_count;
	u32 used_count;
	u32 write_actual;
	u32 queue_size;
	struct list_head rx_free;
	struct list_head rx_used;
	bool need_update;
	struct iwl_rb_status *rb_stts;
	dma_addr_t rb_stts_dma;
	spinlock_t lock;
	struct napi_struct napi;
	struct iwl_rx_mem_buffer *queue[RX_QUEUE_SIZE];
};

/**
 * struct iwl_rb_allocator - Rx allocator
 * @req_pending: number of requests the allcator had not processed yet
 * @req_ready: number of requests honored and ready for claiming
 * @rbd_allocated: RBDs with pages allocated and ready to be handled to
 *	the queue. This is a list of &struct iwl_rx_mem_buffer
 * @rbd_empty: RBDs with no page attached for allocator use. This is a list
 *	of &struct iwl_rx_mem_buffer
 * @lock: protects the rbd_allocated and rbd_empty lists
 * @alloc_wq: work queue for background calls
 * @rx_alloc: work struct for background calls
 */
struct iwl_rb_allocator {
	atomic_t req_pending;
	atomic_t req_ready;
	struct list_head rbd_allocated;
	struct list_head rbd_empty;
	spinlock_t lock;
	struct workqueue_struct *alloc_wq;
	struct work_struct rx_alloc;
};

struct iwl_dma_ptr {
	dma_addr_t dma;
	void *addr;
	size_t size;
};

/**
 * iwl_queue_inc_wrap - increment queue index, wrap back to beginning
 * @index -- current index
 */
static inline int iwl_queue_inc_wrap(int index)
{
	return ++index & (TFD_QUEUE_SIZE_MAX - 1);
}

/**
 * iwl_queue_dec_wrap - decrement queue index, wrap back to end
 * @index -- current index
 */
static inline int iwl_queue_dec_wrap(int index)
{
	return --index & (TFD_QUEUE_SIZE_MAX - 1);
}

struct iwl_cmd_meta {
	/* only for SYNC commands, iff the reply skb is wanted */
	struct iwl_host_cmd *source;
	u32 flags;
	u32 tbs;
};


#define TFD_TX_CMD_SLOTS 256
#define TFD_CMD_SLOTS 32

/*
 * The FH will write back to the first TB only, so we need to copy some data
 * into the buffer regardless of whether it should be mapped or not.
 * This indicates how big the first TB must be to include the scratch buffer
 * and the assigned PN.
 * Since PN location is 8 bytes at offset 12, it's 20 now.
 * If we make it bigger then allocations will be bigger and copy slower, so
 * that's probably not useful.
 */
#define IWL_FIRST_TB_SIZE	20
#define IWL_FIRST_TB_SIZE_ALIGN ALIGN(IWL_FIRST_TB_SIZE, 64)

struct iwl_pcie_txq_entry {
	struct iwl_device_cmd *cmd;
	struct sk_buff *skb;
	/* buffer to free after command completes */
	const void *free_buf;
	struct iwl_cmd_meta meta;
};

struct iwl_pcie_first_tb_buf {
	u8 buf[IWL_FIRST_TB_SIZE_ALIGN];
};

/**
 * struct iwl_txq - Tx Queue for DMA
 * @q: generic Rx/Tx queue descriptor
 * @tfds: transmit frame descriptors (DMA memory)
 * @first_tb_bufs: start of command headers, including scratch buffers, for
 *	the writeback -- this is DMA memory and an array holding one buffer
 *	for each command on the queue
 * @first_tb_dma: DMA address for the first_tb_bufs start
 * @entries: transmit entries (driver state)
 * @lock: queue lock
 * @stuck_timer: timer that fires if queue gets stuck
 * @trans_pcie: pointer back to transport (for timer)
 * @need_update: indicates need to update read/write index
 * @ampdu: true if this queue is an ampdu queue for an specific RA/TID
 * @wd_timeout: queue watchdog timeout (jiffies) - per queue
 * @frozen: tx stuck queue timer is frozen
 * @frozen_expiry_remainder: remember how long until the timer fires
 * @bc_tbl: byte count table of the queue (relevant only for gen2 transport)
 * @write_ptr: 1-st empty entry (index) host_w
 * @read_ptr: last used entry (index) host_r
 * @dma_addr:  physical addr for BD's
 * @n_window: safe queue window
 * @id: queue id
 * @low_mark: low watermark, resume queue if free space more than this
 * @high_mark: high watermark, stop queue if free space less than this
 *
 * A Tx queue consists of circular buffer of BDs (a.k.a. TFDs, transmit frame
 * descriptors) and required locking structures.
 *
 * Note the difference between TFD_QUEUE_SIZE_MAX and n_window: the hardware
 * always assumes 256 descriptors, so TFD_QUEUE_SIZE_MAX is always 256 (unless
 * there might be HW changes in the future). For the normal TX
 * queues, n_window, which is the size of the software queue data
 * is also 256; however, for the command queue, n_window is only
 * 32 since we don't need so many commands pending. Since the HW
 * still uses 256 BDs for DMA though, TFD_QUEUE_SIZE_MAX stays 256.
 * This means that we end up with the following:
 *  HW entries: | 0 | ... | N * 32 | ... | N * 32 + 31 | ... | 255 |
 *  SW entries:           | 0      | ... | 31          |
 * where N is a number between 0 and 7. This means that the SW
 * data is a window overlayed over the HW queue.
 */
struct iwl_txq {
	void *tfds;
	struct iwl_pcie_first_tb_buf *first_tb_bufs;
	dma_addr_t first_tb_dma;
	struct iwl_pcie_txq_entry *entries;
	spinlock_t lock;
	unsigned long frozen_expiry_remainder;
	struct timer_list stuck_timer;
	struct iwl_trans_pcie *trans_pcie;
	bool need_update;
	bool frozen;
	bool ampdu;
	int block;
	unsigned long wd_timeout;
	struct sk_buff_head overflow_q;
	struct iwl_dma_ptr bc_tbl;

	int write_ptr;
	int read_ptr;
	dma_addr_t dma_addr;
	int n_window;
	u32 id;
	int low_mark;
	int high_mark;
};

static inline dma_addr_t
iwl_pcie_get_first_tb_dma(struct iwl_txq *txq, int idx)
{
	return txq->first_tb_dma +
	       sizeof(struct iwl_pcie_first_tb_buf) * idx;
}

struct iwl_tso_hdr_page {
	struct page *page;
	u8 *pos;
};

/**
 * enum iwl_shared_irq_flags - level of sharing for irq
 * @IWL_SHARED_IRQ_NON_RX: interrupt vector serves non rx causes.
 * @IWL_SHARED_IRQ_FIRST_RSS: interrupt vector serves first RSS queue.
 */
enum iwl_shared_irq_flags {
	IWL_SHARED_IRQ_NON_RX		= BIT(0),
	IWL_SHARED_IRQ_FIRST_RSS	= BIT(1),
};

/**
 * struct iwl_dram_data
 * @physical: page phy pointer
 * @block: pointer to the allocated block/page
 * @size: size of the block/page
 */
struct iwl_dram_data {
	dma_addr_t physical;
	void *block;
	int size;
};

/**
 * struct iwl_self_init_dram - dram data used by self init process
 * @fw: lmac and umac dram data
 * @fw_cnt: total number of items in array
 * @paging: paging dram data
 * @paging_cnt: total number of items in array
 */
struct iwl_self_init_dram {
	struct iwl_dram_data *fw;
	int fw_cnt;
	struct iwl_dram_data *paging;
	int paging_cnt;
};

/**
 * struct iwl_trans_pcie - PCIe transport specific data
 * @rxq: all the RX queue data
 * @rx_pool: initial pool of iwl_rx_mem_buffer for all the queues
 * @global_table: table mapping received VID from hw to rxb
 * @rba: allocator for RX replenishing
 * @ctxt_info: context information for FW self init
 * @ctxt_info_dma_addr: dma addr of context information
 * @init_dram: DRAM data of firmware image (including paging).
 *	Context information addresses will be taken from here.
 *	This is driver's local copy for keeping track of size and
 *	count for allocating and freeing the memory.
 * @trans: pointer to the generic transport area
 * @scd_base_addr: scheduler sram base address in SRAM
 * @scd_bc_tbls: pointer to the byte count table of the scheduler
 * @kw: keep warm address
 * @pci_dev: basic pci-network driver stuff
 * @hw_base: pci hardware address support
 * @ucode_write_complete: indicates that the ucode has been copied.
 * @ucode_write_waitq: wait queue for uCode load
 * @cmd_queue - command queue number
 * @rx_buf_size: Rx buffer size
 * @bc_table_dword: true if the BC table expects DWORD (as opposed to bytes)
 * @scd_set_active: should the transport configure the SCD for HCMD queue
 * @sw_csum_tx: if true, then the transport will compute the csum of the TXed
 *	frame.
 * @rx_page_order: page order for receive buffer size
 * @reg_lock: protect hw register access
 * @mutex: to protect stop_device / start_fw / start_hw
 * @cmd_in_flight: true when we have a host command in flight
 * @fw_mon_phys: physical address of the buffer for the firmware monitor
 * @fw_mon_page: points to the first page of the buffer for the firmware monitor
 * @fw_mon_size: size of the buffer for the firmware monitor
 * @msix_entries: array of MSI-X entries
 * @msix_enabled: true if managed to enable MSI-X
 * @shared_vec_mask: the type of causes the shared vector handles
 *	(see iwl_shared_irq_flags).
 * @alloc_vecs: the number of interrupt vectors allocated by the OS
 * @def_irq: default irq for non rx causes
 * @fh_init_mask: initial unmasked fh causes
 * @hw_init_mask: initial unmasked hw causes
 * @fh_mask: current unmasked fh causes
 * @hw_mask: current unmasked hw causes
 */
struct iwl_trans_pcie {
	struct iwl_rxq *rxq;
	struct iwl_rx_mem_buffer rx_pool[RX_POOL_SIZE];
	struct iwl_rx_mem_buffer *global_table[RX_POOL_SIZE];
	struct iwl_rb_allocator rba;
	struct iwl_context_info *ctxt_info;
	dma_addr_t ctxt_info_dma_addr;
	struct iwl_self_init_dram init_dram;
	struct iwl_trans *trans;

	struct net_device napi_dev;

	struct __percpu iwl_tso_hdr_page *tso_hdr_page;

	/* INT ICT Table */
	__le32 *ict_tbl;
	dma_addr_t ict_tbl_dma;
	int ict_index;
	bool use_ict;
	bool is_down, opmode_down;
	bool debug_rfkill;
	struct isr_statistics isr_stats;

	spinlock_t irq_lock;
	struct mutex mutex;
	u32 inta_mask;
	u32 scd_base_addr;
	struct iwl_dma_ptr scd_bc_tbls;
	struct iwl_dma_ptr kw;

	struct iwl_txq *txq_memory;
	struct iwl_txq *txq[IWL_MAX_TVQM_QUEUES];
	unsigned long queue_used[BITS_TO_LONGS(IWL_MAX_TVQM_QUEUES)];
	unsigned long queue_stopped[BITS_TO_LONGS(IWL_MAX_TVQM_QUEUES)];

	/* PCI bus related data */
	struct pci_dev *pci_dev;
	void __iomem *hw_base;

	bool ucode_write_complete;
	wait_queue_head_t ucode_write_waitq;
	wait_queue_head_t wait_command_queue;
	wait_queue_head_t d0i3_waitq;

	u8 page_offs, dev_cmd_offs;

	u8 cmd_queue;
	u8 cmd_fifo;
	unsigned int cmd_q_wdg_timeout;
	u8 n_no_reclaim_cmds;
	u8 no_reclaim_cmds[MAX_NO_RECLAIM_CMDS];
	u8 max_tbs;
	u16 tfd_size;

	enum iwl_amsdu_size rx_buf_size;
	bool bc_table_dword;
	bool scd_set_active;
	bool sw_csum_tx;
	u32 rx_page_order;

	/*protect hw register */
	spinlock_t reg_lock;
	bool cmd_hold_nic_awake;
	bool ref_cmd_in_flight;

	dma_addr_t fw_mon_phys;
	struct page *fw_mon_page;
	u32 fw_mon_size;

	struct msix_entry msix_entries[IWL_MAX_RX_HW_QUEUES];
	bool msix_enabled;
	u8 shared_vec_mask;
	u32 alloc_vecs;
	u32 def_irq;
	u32 fh_init_mask;
	u32 hw_init_mask;
	u32 fh_mask;
	u32 hw_mask;
	cpumask_t affinity_mask[IWL_MAX_RX_HW_QUEUES];
};

static inline struct iwl_trans_pcie *
IWL_TRANS_GET_PCIE_TRANS(struct iwl_trans *trans)
{
	return (void *)trans->trans_specific;
}

static inline struct iwl_trans *
iwl_trans_pcie_get_trans(struct iwl_trans_pcie *trans_pcie)
{
	return container_of((void *)trans_pcie, struct iwl_trans,
			    trans_specific);
}

/*
 * Convention: trans API functions: iwl_trans_pcie_XXX
 *	Other functions: iwl_pcie_XXX
 */
struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
				       const struct pci_device_id *ent,
				       const struct iwl_cfg *cfg);
void iwl_trans_pcie_free(struct iwl_trans *trans);

/*****************************************************
* RX
******************************************************/
int iwl_pcie_rx_init(struct iwl_trans *trans);
int iwl_pcie_gen2_rx_init(struct iwl_trans *trans);
irqreturn_t iwl_pcie_msix_isr(int irq, void *data);
irqreturn_t iwl_pcie_irq_handler(int irq, void *dev_id);
irqreturn_t iwl_pcie_irq_msix_handler(int irq, void *dev_id);
irqreturn_t iwl_pcie_irq_rx_msix_handler(int irq, void *dev_id);
int iwl_pcie_rx_stop(struct iwl_trans *trans);
void iwl_pcie_rx_free(struct iwl_trans *trans);

/*****************************************************
* ICT - interrupt handling
******************************************************/
irqreturn_t iwl_pcie_isr(int irq, void *data);
int iwl_pcie_alloc_ict(struct iwl_trans *trans);
void iwl_pcie_free_ict(struct iwl_trans *trans);
void iwl_pcie_reset_ict(struct iwl_trans *trans);
void iwl_pcie_disable_ict(struct iwl_trans *trans);

/*****************************************************
* TX / HCMD
******************************************************/
int iwl_pcie_tx_init(struct iwl_trans *trans);
int iwl_pcie_gen2_tx_init(struct iwl_trans *trans);
void iwl_pcie_tx_start(struct iwl_trans *trans, u32 scd_base_addr);
int iwl_pcie_tx_stop(struct iwl_trans *trans);
void iwl_pcie_tx_free(struct iwl_trans *trans);
bool iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int queue, u16 ssn,
			       const struct iwl_trans_txq_scd_cfg *cfg,
			       unsigned int wdg_timeout);
void iwl_trans_pcie_txq_disable(struct iwl_trans *trans, int queue,
				bool configure_scd);
void iwl_trans_pcie_txq_set_shared_mode(struct iwl_trans *trans, u32 txq_id,
					bool shared_mode);
void iwl_trans_pcie_log_scd_error(struct iwl_trans *trans,
				  struct iwl_txq *txq);
int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb,
		      struct iwl_device_cmd *dev_cmd, int txq_id);
void iwl_pcie_txq_check_wrptrs(struct iwl_trans *trans);
int iwl_trans_pcie_send_hcmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd);
void iwl_pcie_hcmd_complete(struct iwl_trans *trans,
			    struct iwl_rx_cmd_buffer *rxb);
void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn,
			    struct sk_buff_head *skbs);
void iwl_trans_pcie_tx_reset(struct iwl_trans *trans);

static inline u16 iwl_pcie_tfd_tb_get_len(struct iwl_trans *trans, void *_tfd,
					  u8 idx)
{
	if (trans->cfg->use_tfh) {
		struct iwl_tfh_tfd *tfd = _tfd;
		struct iwl_tfh_tb *tb = &tfd->tbs[idx];

		return le16_to_cpu(tb->tb_len);
	} else {
		struct iwl_tfd *tfd = _tfd;
		struct iwl_tfd_tb *tb = &tfd->tbs[idx];

		return le16_to_cpu(tb->hi_n_len) >> 4;
	}
}

/*****************************************************
* Error handling
******************************************************/
void iwl_pcie_dump_csr(struct iwl_trans *trans);

/*****************************************************
* Helpers
******************************************************/
static inline void _iwl_disable_interrupts(struct iwl_trans *trans)
{
	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

	clear_bit(STATUS_INT_ENABLED, &trans->status);
	if (!trans_pcie->msix_enabled) {
		/* disable interrupts from uCode/NIC to host */
		iwl_write32(trans, CSR_INT_MASK, 0x00000000);

		/* acknowledge/clear/reset any interrupts still pending
		 * from uCode or flow handler (Rx/Tx DMA) */
		iwl_write32(trans, CSR_INT, 0xffffffff);
		iwl_write32(trans, CSR_FH_INT_STATUS, 0xffffffff);
	} else {
		/* disable all the interrupt we might use */
		iwl_write32(trans, CSR_MSIX_FH_INT_MASK_AD,
			    trans_pcie->fh_init_mask);
		iwl_write32(trans, CSR_MSIX_HW_INT_MASK_AD,
			    trans_pcie->hw_init_mask);
	}
	IWL_DEBUG_ISR(trans, "Disabled interrupts\n");
}

static inline void iwl_disable_interrupts(struct iwl_trans *trans)
{
	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

	spin_lock(&trans_pcie->irq_lock);
	_iwl_disable_interrupts(trans);
	spin_unlock(&trans_pcie->irq_lock);
}

static inline void _iwl_enable_interrupts(struct iwl_trans *trans)
{
	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

	IWL_DEBUG_ISR(trans, "Enabling interrupts\n");
	set_bit(STATUS_INT_ENABLED, &trans->status);
	if (!trans_pcie->msix_enabled) {
		trans_pcie->inta_mask = CSR_INI_SET_MASK;
		iwl_write32(trans, CSR_INT_MASK, trans_pcie->inta_mask);
	} else {
		/*
		 * fh/hw_mask keeps all the unmasked causes.
		 * Unlike msi, in msix cause is enabled when it is unset.
		 */
		trans_pcie->hw_mask = trans_pcie->hw_init_mask;
		trans_pcie->fh_mask = trans_pcie->fh_init_mask;
		iwl_write32(trans, CSR_MSIX_FH_INT_MASK_AD,
			    ~trans_pcie->fh_mask);
		iwl_write32(trans, CSR_MSIX_HW_INT_MASK_AD,
			    ~trans_pcie->hw_mask);
	}
}

static inline void iwl_enable_interrupts(struct iwl_trans *trans)
{
	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

	spin_lock(&trans_pcie->irq_lock);
	_iwl_enable_interrupts(trans);
	spin_unlock(&trans_pcie->irq_lock);
}
static inline void iwl_enable_hw_int_msk_msix(struct iwl_trans *trans, u32 msk)
{
	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

	iwl_write32(trans, CSR_MSIX_HW_INT_MASK_AD, ~msk);
	trans_pcie->hw_mask = msk;
}

static inline void iwl_enable_fh_int_msk_msix(struct iwl_trans *trans, u32 msk)
{
	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

	iwl_write32(trans, CSR_MSIX_FH_INT_MASK_AD, ~msk);
	trans_pcie->fh_mask = msk;
}

static inline void iwl_enable_fw_load_int(struct iwl_trans *trans)
{
	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

	IWL_DEBUG_ISR(trans, "Enabling FW load interrupt\n");
	if (!trans_pcie->msix_enabled) {
		trans_pcie->inta_mask = CSR_INT_BIT_FH_TX;
		iwl_write32(trans, CSR_INT_MASK, trans_pcie->inta_mask);
	} else {
		iwl_write32(trans, CSR_MSIX_HW_INT_MASK_AD,
			    trans_pcie->hw_init_mask);
		iwl_enable_fh_int_msk_msix(trans,
					   MSIX_FH_INT_CAUSES_D2S_CH0_NUM);
	}
}

static inline void iwl_pcie_sw_reset(struct iwl_trans *trans)
{
	/* Reset entire device - do controller reset (results in SHRD_HW_RST) */
	iwl_set_bit(trans, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
	usleep_range(5000, 6000);
}

static inline void *iwl_pcie_get_tfd(struct iwl_trans_pcie *trans_pcie,
				     struct iwl_txq *txq, int idx)
{
	return txq->tfds + trans_pcie->tfd_size * idx;
}

static inline void iwl_enable_rfkill_int(struct iwl_trans *trans)
{
	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

	IWL_DEBUG_ISR(trans, "Enabling rfkill interrupt\n");
	if (!trans_pcie->msix_enabled) {
		trans_pcie->inta_mask = CSR_INT_BIT_RF_KILL;
		iwl_write32(trans, CSR_INT_MASK, trans_pcie->inta_mask);
	} else {
		iwl_write32(trans, CSR_MSIX_FH_INT_MASK_AD,
			    trans_pcie->fh_init_mask);
		iwl_enable_hw_int_msk_msix(trans,
					   MSIX_HW_INT_CAUSES_REG_RF_KILL);
	}

	if (trans->cfg->device_family == IWL_DEVICE_FAMILY_9000) {
		/*
		 * On 9000-series devices this bit isn't enabled by default, so
		 * when we power down the device we need set the bit to allow it
		 * to wake up the PCI-E bus for RF-kill interrupts.
		 */
		iwl_set_bit(trans, CSR_GP_CNTRL,
			    CSR_GP_CNTRL_REG_FLAG_RFKILL_WAKE_L1A_EN);
	}
}

void iwl_pcie_handle_rfkill_irq(struct iwl_trans *trans);

static inline void iwl_wake_queue(struct iwl_trans *trans,
				  struct iwl_txq *txq)
{
	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

	if (test_and_clear_bit(txq->id, trans_pcie->queue_stopped)) {
		IWL_DEBUG_TX_QUEUES(trans, "Wake hwq %d\n", txq->id);
		iwl_op_mode_queue_not_full(trans->op_mode, txq->id);
	}
}

static inline void iwl_stop_queue(struct iwl_trans *trans,
				  struct iwl_txq *txq)
{
	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

	if (!test_and_set_bit(txq->id, trans_pcie->queue_stopped)) {
		iwl_op_mode_queue_full(trans->op_mode, txq->id);
		IWL_DEBUG_TX_QUEUES(trans, "Stop hwq %d\n", txq->id);
	} else
		IWL_DEBUG_TX_QUEUES(trans, "hwq %d already stopped\n",
				    txq->id);
}

static inline bool iwl_queue_used(const struct iwl_txq *q, int i)
{
	return q->write_ptr >= q->read_ptr ?
		(i >= q->read_ptr && i < q->write_ptr) :
		!(i < q->read_ptr && i >= q->write_ptr);
}

static inline u8 get_cmd_index(struct iwl_txq *q, u32 index)
{
	return index & (q->n_window - 1);
}

static inline bool iwl_is_rfkill_set(struct iwl_trans *trans)
{
	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);

	lockdep_assert_held(&trans_pcie->mutex);

	if (trans_pcie->debug_rfkill)
		return true;

	return !(iwl_read32(trans, CSR_GP_CNTRL) &
		CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW);
}

static inline void __iwl_trans_pcie_set_bits_mask(struct iwl_trans *trans,
						  u32 reg, u32 mask, u32 value)
{
	u32 v;

#ifdef CONFIG_IWLWIFI_DEBUG
	WARN_ON_ONCE(value & ~mask);
#endif

	v = iwl_read32(trans, reg);
	v &= ~mask;
	v |= value;
	iwl_write32(trans, reg, v);
}

static inline void __iwl_trans_pcie_clear_bit(struct iwl_trans *trans,
					      u32 reg, u32 mask)
{
	__iwl_trans_pcie_set_bits_mask(trans, reg, mask, 0);
}

static inline void __iwl_trans_pcie_set_bit(struct iwl_trans *trans,
					    u32 reg, u32 mask)
{
	__iwl_trans_pcie_set_bits_mask(trans, reg, mask, mask);
}

void iwl_trans_pcie_rf_kill(struct iwl_trans *trans, bool state);

#ifdef CONFIG_IWLWIFI_DEBUGFS
int iwl_trans_pcie_dbgfs_register(struct iwl_trans *trans);
#else
static inline int iwl_trans_pcie_dbgfs_register(struct iwl_trans *trans)
{
	return 0;
}
#endif

int iwl_pci_fw_exit_d0i3(struct iwl_trans *trans);
int iwl_pci_fw_enter_d0i3(struct iwl_trans *trans);

void iwl_pcie_enable_rx_wake(struct iwl_trans *trans, bool enable);

/* common functions that are used by gen2 transport */
void iwl_pcie_apm_config(struct iwl_trans *trans);
int iwl_pcie_prepare_card_hw(struct iwl_trans *trans);
void iwl_pcie_synchronize_irqs(struct iwl_trans *trans);
bool iwl_trans_check_hw_rf_kill(struct iwl_trans *trans);
void iwl_trans_pcie_handle_stop_rfkill(struct iwl_trans *trans,
				       bool was_in_rfkill);
void iwl_pcie_txq_free_tfd(struct iwl_trans *trans, struct iwl_txq *txq);
int iwl_queue_space(const struct iwl_txq *q);
void iwl_pcie_apm_stop_master(struct iwl_trans *trans);
void iwl_pcie_conf_msix_hw(struct iwl_trans_pcie *trans_pcie);
int iwl_pcie_txq_init(struct iwl_trans *trans, struct iwl_txq *txq,
		      int slots_num, bool cmd_queue);
int iwl_pcie_txq_alloc(struct iwl_trans *trans,
		       struct iwl_txq *txq, int slots_num,  bool cmd_queue);
int iwl_pcie_alloc_dma_ptr(struct iwl_trans *trans,
			   struct iwl_dma_ptr *ptr, size_t size);
void iwl_pcie_free_dma_ptr(struct iwl_trans *trans, struct iwl_dma_ptr *ptr);
void iwl_pcie_apply_destination(struct iwl_trans *trans);
#ifdef CONFIG_INET
struct iwl_tso_hdr_page *get_page_hdr(struct iwl_trans *trans, size_t len);
#endif

/* transport gen 2 exported functions */
int iwl_trans_pcie_gen2_start_fw(struct iwl_trans *trans,
				 const struct fw_img *fw, bool run_in_rfkill);
void iwl_trans_pcie_gen2_fw_alive(struct iwl_trans *trans, u32 scd_addr);
int iwl_trans_pcie_dyn_txq_alloc(struct iwl_trans *trans,
				 struct iwl_tx_queue_cfg_cmd *cmd,
				 int cmd_id,
				 unsigned int timeout);
void iwl_trans_pcie_dyn_txq_free(struct iwl_trans *trans, int queue);
int iwl_trans_pcie_gen2_tx(struct iwl_trans *trans, struct sk_buff *skb,
			   struct iwl_device_cmd *dev_cmd, int txq_id);
int iwl_trans_pcie_gen2_send_hcmd(struct iwl_trans *trans,
				  struct iwl_host_cmd *cmd);
void iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans,
				     bool low_power);
void _iwl_trans_pcie_gen2_stop_device(struct iwl_trans *trans, bool low_power);
void iwl_pcie_gen2_txq_unmap(struct iwl_trans *trans, int txq_id);
void iwl_pcie_gen2_tx_free(struct iwl_trans *trans);
void iwl_pcie_gen2_tx_stop(struct iwl_trans *trans);
#endif /* __iwl_trans_int_pcie_h__ */