1 /* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
3 * Copyright(c) 2015 - 2018 Intel Corporation.
9 #include <linux/types.h>
10 #include <linux/list.h>
11 #include <asm/byteorder.h>
12 #include <linux/workqueue.h>
13 #include <linux/rculist.h>
17 #include "sdma_txreq.h"
21 /* Hardware limit for SDMA packet size */
22 #define MAX_SDMA_PKT_SIZE ((16 * 1024) - 1)
24 #define SDMA_MAP_NONE 0
25 #define SDMA_MAP_SINGLE 1
26 #define SDMA_MAP_PAGE 2
28 #define SDMA_AHG_VALUE_MASK 0xffff
29 #define SDMA_AHG_VALUE_SHIFT 0
30 #define SDMA_AHG_INDEX_MASK 0xf
31 #define SDMA_AHG_INDEX_SHIFT 16
32 #define SDMA_AHG_FIELD_LEN_MASK 0xf
33 #define SDMA_AHG_FIELD_LEN_SHIFT 20
34 #define SDMA_AHG_FIELD_START_MASK 0x1f
35 #define SDMA_AHG_FIELD_START_SHIFT 24
36 #define SDMA_AHG_UPDATE_ENABLE_MASK 0x1
37 #define SDMA_AHG_UPDATE_ENABLE_SHIFT 31
42 * Be aware the ordering and values
43 * for SDMA_AHG_APPLY_UPDATE[123]
44 * are assumed in generating a skip
45 * count in submit_tx() in sdma.c
47 #define SDMA_AHG_NO_AHG 0
48 #define SDMA_AHG_COPY 1
49 #define SDMA_AHG_APPLY_UPDATE1 2
50 #define SDMA_AHG_APPLY_UPDATE2 3
51 #define SDMA_AHG_APPLY_UPDATE3 4
54 * Bits defined in the send DMA descriptor.
56 #define SDMA_DESC0_FIRST_DESC_FLAG BIT_ULL(63)
57 #define SDMA_DESC0_LAST_DESC_FLAG BIT_ULL(62)
58 #define SDMA_DESC0_BYTE_COUNT_SHIFT 48
59 #define SDMA_DESC0_BYTE_COUNT_WIDTH 14
60 #define SDMA_DESC0_BYTE_COUNT_MASK \
61 ((1ULL << SDMA_DESC0_BYTE_COUNT_WIDTH) - 1)
62 #define SDMA_DESC0_BYTE_COUNT_SMASK \
63 (SDMA_DESC0_BYTE_COUNT_MASK << SDMA_DESC0_BYTE_COUNT_SHIFT)
64 #define SDMA_DESC0_PHY_ADDR_SHIFT 0
65 #define SDMA_DESC0_PHY_ADDR_WIDTH 48
66 #define SDMA_DESC0_PHY_ADDR_MASK \
67 ((1ULL << SDMA_DESC0_PHY_ADDR_WIDTH) - 1)
68 #define SDMA_DESC0_PHY_ADDR_SMASK \
69 (SDMA_DESC0_PHY_ADDR_MASK << SDMA_DESC0_PHY_ADDR_SHIFT)
71 #define SDMA_DESC1_HEADER_UPDATE1_SHIFT 32
72 #define SDMA_DESC1_HEADER_UPDATE1_WIDTH 32
73 #define SDMA_DESC1_HEADER_UPDATE1_MASK \
74 ((1ULL << SDMA_DESC1_HEADER_UPDATE1_WIDTH) - 1)
75 #define SDMA_DESC1_HEADER_UPDATE1_SMASK \
76 (SDMA_DESC1_HEADER_UPDATE1_MASK << SDMA_DESC1_HEADER_UPDATE1_SHIFT)
77 #define SDMA_DESC1_HEADER_MODE_SHIFT 13
78 #define SDMA_DESC1_HEADER_MODE_WIDTH 3
79 #define SDMA_DESC1_HEADER_MODE_MASK \
80 ((1ULL << SDMA_DESC1_HEADER_MODE_WIDTH) - 1)
81 #define SDMA_DESC1_HEADER_MODE_SMASK \
82 (SDMA_DESC1_HEADER_MODE_MASK << SDMA_DESC1_HEADER_MODE_SHIFT)
83 #define SDMA_DESC1_HEADER_INDEX_SHIFT 8
84 #define SDMA_DESC1_HEADER_INDEX_WIDTH 5
85 #define SDMA_DESC1_HEADER_INDEX_MASK \
86 ((1ULL << SDMA_DESC1_HEADER_INDEX_WIDTH) - 1)
87 #define SDMA_DESC1_HEADER_INDEX_SMASK \
88 (SDMA_DESC1_HEADER_INDEX_MASK << SDMA_DESC1_HEADER_INDEX_SHIFT)
89 #define SDMA_DESC1_HEADER_DWS_SHIFT 4
90 #define SDMA_DESC1_HEADER_DWS_WIDTH 4
91 #define SDMA_DESC1_HEADER_DWS_MASK \
92 ((1ULL << SDMA_DESC1_HEADER_DWS_WIDTH) - 1)
93 #define SDMA_DESC1_HEADER_DWS_SMASK \
94 (SDMA_DESC1_HEADER_DWS_MASK << SDMA_DESC1_HEADER_DWS_SHIFT)
95 #define SDMA_DESC1_GENERATION_SHIFT 2
96 #define SDMA_DESC1_GENERATION_WIDTH 2
97 #define SDMA_DESC1_GENERATION_MASK \
98 ((1ULL << SDMA_DESC1_GENERATION_WIDTH) - 1)
99 #define SDMA_DESC1_GENERATION_SMASK \
100 (SDMA_DESC1_GENERATION_MASK << SDMA_DESC1_GENERATION_SHIFT)
101 #define SDMA_DESC1_INT_REQ_FLAG BIT_ULL(1)
102 #define SDMA_DESC1_HEAD_TO_HOST_FLAG BIT_ULL(0)
105 sdma_state_s00_hw_down,
106 sdma_state_s10_hw_start_up_halt_wait,
107 sdma_state_s15_hw_start_up_clean_wait,
109 sdma_state_s30_sw_clean_up_wait,
110 sdma_state_s40_hw_clean_up_wait,
111 sdma_state_s50_hw_halt_wait,
112 sdma_state_s60_idle_halt_wait,
113 sdma_state_s80_hw_freeze,
114 sdma_state_s82_freeze_sw_clean,
115 sdma_state_s99_running,
119 sdma_event_e00_go_hw_down,
120 sdma_event_e10_go_hw_start,
121 sdma_event_e15_hw_halt_done,
122 sdma_event_e25_hw_clean_up_done,
123 sdma_event_e30_go_running,
124 sdma_event_e40_sw_cleaned,
125 sdma_event_e50_hw_cleaned,
126 sdma_event_e60_hw_halted,
127 sdma_event_e70_go_idle,
128 sdma_event_e80_hw_freeze,
129 sdma_event_e81_hw_frozen,
130 sdma_event_e82_hw_unfreeze,
131 sdma_event_e85_link_down,
132 sdma_event_e90_sw_halted,
135 struct sdma_set_state_action {
136 unsigned op_enable:1;
137 unsigned op_intenable:1;
139 unsigned op_cleanup:1;
140 unsigned go_s99_running_tofalse:1;
141 unsigned go_s99_running_totrue:1;
146 struct completion comp;
147 enum sdma_states current_state;
149 unsigned go_s99_running;
150 /* debugging/development */
151 enum sdma_states previous_state;
152 unsigned previous_op;
153 enum sdma_events last_event;
157 * DOC: sdma exported routines
159 * These sdma routines fit into three categories:
160 * - The SDMA API for building and submitting packets
163 * - Initialization and tear down routines to buildup
166 * - ISR entrances to handle interrupts, state changes
171 * DOC: sdma PSM/verbs API
173 * The sdma API is designed to be used by both PSM
174 * and verbs to supply packets to the SDMA ring.
176 * The usage of the API is as follows:
178 * Embed a struct iowait in the QP or
179 * PQ. The iowait should be initialized with a
180 * call to iowait_init().
182 * The user of the API should create an allocation method
183 * for their version of the txreq. slabs, pre-allocated lists,
184 * and dma pools can be used. Once the user's overload of
185 * the sdma_txreq has been allocated, the sdma_txreq member
186 * must be initialized with sdma_txinit() or sdma_txinit_ahg().
188 * The txreq must be declared with the sdma_txreq first.
190 * The tx request, once initialized, is manipulated with calls to
191 * sdma_txadd_daddr(), sdma_txadd_page(), or sdma_txadd_kvaddr()
192 * for each disjoint memory location. It is the user's responsibility
193 * to understand the packet boundaries and page boundaries to do the
194 * appropriate number of sdma_txadd_* calls.. The user
195 * must be prepared to deal with failures from these routines due to
196 * either memory allocation or dma_mapping failures.
198 * The mapping specifics for each memory location are recorded
199 * in the tx. Memory locations added with sdma_txadd_page()
200 * and sdma_txadd_kvaddr() are automatically mapped when added
201 * to the tx and nmapped as part of the progress processing in the
202 * SDMA interrupt handling.
204 * sdma_txadd_daddr() is used to add an dma_addr_t memory to the
205 * tx. An example of a use case would be a pre-allocated
206 * set of headers allocated via dma_pool_alloc() or
207 * dma_alloc_coherent(). For these memory locations, it
208 * is the responsibility of the user to handle that unmapping.
209 * (This would usually be at an unload or job termination.)
211 * The routine sdma_send_txreq() is used to submit
212 * a tx to the ring after the appropriate number of
213 * sdma_txadd_* have been done.
215 * If it is desired to send a burst of sdma_txreqs, sdma_send_txlist()
216 * can be used to submit a list of packets.
218 * The user is free to use the link overhead in the struct sdma_txreq as
219 * long as the tx isn't in flight.
221 * The extreme degenerate case of the number of descriptors
222 * exceeding the ring size is automatically handled as
223 * memory locations are added. An overflow of the descriptor
224 * array that is part of the sdma_txreq is also automatically
230 * DOC: Infrastructure calls
232 * sdma_init() is used to initialize data structures and
233 * CSRs for the desired number of SDMA engines.
235 * sdma_start() is used to kick the SDMA engines initialized
236 * with sdma_init(). Interrupts must be enabled at this
237 * point since aspects of the state machine are interrupt
240 * sdma_engine_error() and sdma_engine_interrupt() are
241 * entrances for interrupts.
243 * sdma_map_init() is for the management of the mapping
244 * table when the number of vls is changed.
249 * struct hw_sdma_desc - raw 128 bit SDMA descriptor
251 * This is the raw descriptor in the SDMA ring
253 struct hw_sdma_desc {
254 /* private: don't use directly */
259 * struct sdma_engine - Data pertaining to each SDMA engine.
260 * @dd: a back-pointer to the device data
261 * @ppd: per port back-pointer
262 * @imask: mask for irq manipulation
263 * @idle_mask: mask for determining if an interrupt is due to sdma_idle
265 * This structure has the state for each sdma_engine.
267 * Accessing to non public fields are not supported
268 * since the private members are subject to change.
272 struct hfi1_devdata *dd;
273 struct hfi1_pportdata *ppd;
275 void __iomem *tail_csr;
276 u64 imask; /* clear interrupt mask */
281 volatile __le64 *head_dma; /* DMA'ed by chip */
283 dma_addr_t head_phys;
285 struct hw_sdma_desc *descq;
287 unsigned descq_full_count;
288 struct sdma_txreq **tx_ring;
290 dma_addr_t descq_phys;
294 struct sdma_state state;
300 u8 this_idx; /* zero relative engine */
301 /* protect changes to senddmactrl shadow */
302 spinlock_t senddmactrl_lock;
304 u64 p_senddmactrl; /* shadow per-engine SendDmaCtrl */
306 /* read/write using tail_lock */
307 spinlock_t tail_lock ____cacheline_aligned_in_smp;
308 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER
315 unsigned long ahg_bits;
323 /* read/write using head_lock */
325 seqlock_t head_lock ____cacheline_aligned_in_smp;
326 #ifdef CONFIG_HFI1_DEBUG_SDMA_ORDER
341 u64 progress_int_cnt;
345 struct list_head dmawait;
347 /* CONFIG SDMA for now, just blindly duplicate */
349 struct tasklet_struct sdma_hw_clean_up_task
350 ____cacheline_aligned_in_smp;
353 struct tasklet_struct sdma_sw_clean_up_task
354 ____cacheline_aligned_in_smp;
356 struct work_struct err_halt_worker;
358 struct timer_list err_progress_check_timer;
359 u32 progress_check_head;
361 struct work_struct flush_worker;
362 /* protect flush list */
363 spinlock_t flushlist_lock;
365 struct list_head flushlist;
366 struct cpumask cpu_mask;
371 int sdma_init(struct hfi1_devdata *dd, u8 port);
372 void sdma_start(struct hfi1_devdata *dd);
373 void sdma_exit(struct hfi1_devdata *dd);
374 void sdma_clean(struct hfi1_devdata *dd, size_t num_engines);
375 void sdma_all_running(struct hfi1_devdata *dd);
376 void sdma_all_idle(struct hfi1_devdata *dd);
377 void sdma_freeze_notify(struct hfi1_devdata *dd, int go_idle);
378 void sdma_freeze(struct hfi1_devdata *dd);
379 void sdma_unfreeze(struct hfi1_devdata *dd);
380 void sdma_wait(struct hfi1_devdata *dd);
383 * sdma_empty() - idle engine test
384 * @engine: sdma engine
386 * Currently used by verbs as a latency optimization.
389 * 1 - empty, 0 - non-empty
391 static inline int sdma_empty(struct sdma_engine *sde)
393 return sde->descq_tail == sde->descq_head;
396 static inline u16 sdma_descq_freecnt(struct sdma_engine *sde)
398 return sde->descq_cnt -
400 READ_ONCE(sde->descq_head)) - 1;
403 static inline u16 sdma_descq_inprocess(struct sdma_engine *sde)
405 return sde->descq_cnt - sdma_descq_freecnt(sde);
409 * Either head_lock or tail lock required to see
412 static inline int __sdma_running(struct sdma_engine *engine)
414 return engine->state.current_state == sdma_state_s99_running;
418 * sdma_running() - state suitability test
419 * @engine: sdma engine
421 * sdma_running probes the internal state to determine if it is suitable
422 * for submitting packets.
425 * 1 - ok to submit, 0 - not ok to submit
428 static inline int sdma_running(struct sdma_engine *engine)
433 spin_lock_irqsave(&engine->tail_lock, flags);
434 ret = __sdma_running(engine);
435 spin_unlock_irqrestore(&engine->tail_lock, flags);
439 void _sdma_txreq_ahgadd(
440 struct sdma_txreq *tx,
447 * sdma_txinit_ahg() - initialize an sdma_txreq struct with AHG
448 * @tx: tx request to initialize
449 * @flags: flags to key last descriptor additions
450 * @tlen: total packet length (pbc + headers + data)
451 * @ahg_entry: ahg entry to use (0 - 31)
452 * @num_ahg: ahg descriptor for first descriptor (0 - 9)
453 * @ahg: array of AHG descriptors (up to 9 entries)
454 * @ahg_hlen: number of bytes from ASIC entry to use
457 * The allocation of the sdma_txreq and it enclosing structure is user
458 * dependent. This routine must be called to initialize the user independent
461 * The currently supported flags are SDMA_TXREQ_F_URGENT,
462 * SDMA_TXREQ_F_AHG_COPY, and SDMA_TXREQ_F_USE_AHG.
464 * SDMA_TXREQ_F_URGENT is used for latency sensitive situations where the
465 * completion is desired as soon as possible.
467 * SDMA_TXREQ_F_AHG_COPY causes the header in the first descriptor to be
468 * copied to chip entry. SDMA_TXREQ_F_USE_AHG causes the code to add in
469 * the AHG descriptors into the first 1 to 3 descriptors.
471 * Completions of submitted requests can be gotten on selected
472 * txreqs by giving a completion routine callback to sdma_txinit() or
473 * sdma_txinit_ahg(). The environment in which the callback runs
474 * can be from an ISR, a tasklet, or a thread, so no sleeping
475 * kernel routines can be used. Aspects of the sdma ring may
476 * be locked so care should be taken with locking.
478 * The callback pointer can be NULL to avoid any callback for the packet
479 * being submitted. The callback will be provided this tx, a status, and a flag.
481 * The status will be one of SDMA_TXREQ_S_OK, SDMA_TXREQ_S_SENDERROR,
482 * SDMA_TXREQ_S_ABORTED, or SDMA_TXREQ_S_SHUTDOWN.
484 * The flag, if the is the iowait had been used, indicates the iowait
485 * sdma_busy count has reached zero.
487 * user data portion of tlen should be precise. The sdma_txadd_* entrances
488 * will pad with a descriptor references 1 - 3 bytes when the number of bytes
489 * specified in tlen have been supplied to the sdma_txreq.
491 * ahg_hlen is used to determine the number of on-chip entry bytes to
492 * use as the header. This is for cases where the stored header is
493 * larger than the header to be used in a packet. This is typical
494 * for verbs where an RDMA_WRITE_FIRST is larger than the packet in
495 * and RDMA_WRITE_MIDDLE.
498 static inline int sdma_txinit_ahg(
499 struct sdma_txreq *tx,
506 void (*cb)(struct sdma_txreq *, int))
510 if (tlen > MAX_SDMA_PKT_SIZE)
512 tx->desc_limit = ARRAY_SIZE(tx->descs);
513 tx->descp = &tx->descs[0];
514 INIT_LIST_HEAD(&tx->list);
518 tx->coalesce_buf = NULL;
520 tx->packet_len = tlen;
521 tx->tlen = tx->packet_len;
522 tx->descs[0].qw[0] = SDMA_DESC0_FIRST_DESC_FLAG;
523 tx->descs[0].qw[1] = 0;
524 if (flags & SDMA_TXREQ_F_AHG_COPY)
525 tx->descs[0].qw[1] |=
526 (((u64)ahg_entry & SDMA_DESC1_HEADER_INDEX_MASK)
527 << SDMA_DESC1_HEADER_INDEX_SHIFT) |
528 (((u64)SDMA_AHG_COPY & SDMA_DESC1_HEADER_MODE_MASK)
529 << SDMA_DESC1_HEADER_MODE_SHIFT);
530 else if (flags & SDMA_TXREQ_F_USE_AHG && num_ahg)
531 _sdma_txreq_ahgadd(tx, num_ahg, ahg_entry, ahg, ahg_hlen);
536 * sdma_txinit() - initialize an sdma_txreq struct (no AHG)
537 * @tx: tx request to initialize
538 * @flags: flags to key last descriptor additions
539 * @tlen: total packet length (pbc + headers + data)
540 * @cb: callback pointer
542 * The allocation of the sdma_txreq and it enclosing structure is user
543 * dependent. This routine must be called to initialize the user
544 * independent fields.
546 * The currently supported flags is SDMA_TXREQ_F_URGENT.
548 * SDMA_TXREQ_F_URGENT is used for latency sensitive situations where the
549 * completion is desired as soon as possible.
551 * Completions of submitted requests can be gotten on selected
552 * txreqs by giving a completion routine callback to sdma_txinit() or
553 * sdma_txinit_ahg(). The environment in which the callback runs
554 * can be from an ISR, a tasklet, or a thread, so no sleeping
555 * kernel routines can be used. The head size of the sdma ring may
556 * be locked so care should be taken with locking.
558 * The callback pointer can be NULL to avoid any callback for the packet
561 * The callback, if non-NULL, will be provided this tx and a status. The
562 * status will be one of SDMA_TXREQ_S_OK, SDMA_TXREQ_S_SENDERROR,
563 * SDMA_TXREQ_S_ABORTED, or SDMA_TXREQ_S_SHUTDOWN.
566 static inline int sdma_txinit(
567 struct sdma_txreq *tx,
570 void (*cb)(struct sdma_txreq *, int))
572 return sdma_txinit_ahg(tx, flags, tlen, 0, 0, NULL, 0, cb);
575 /* helpers - don't use */
576 static inline int sdma_mapping_type(struct sdma_desc *d)
578 return (d->qw[1] & SDMA_DESC1_GENERATION_SMASK)
579 >> SDMA_DESC1_GENERATION_SHIFT;
582 static inline size_t sdma_mapping_len(struct sdma_desc *d)
584 return (d->qw[0] & SDMA_DESC0_BYTE_COUNT_SMASK)
585 >> SDMA_DESC0_BYTE_COUNT_SHIFT;
588 static inline dma_addr_t sdma_mapping_addr(struct sdma_desc *d)
590 return (d->qw[0] & SDMA_DESC0_PHY_ADDR_SMASK)
591 >> SDMA_DESC0_PHY_ADDR_SHIFT;
594 static inline void make_tx_sdma_desc(
595 struct sdma_txreq *tx,
601 struct sdma_desc *desc = &tx->descp[tx->num_desc];
604 /* qw[0] zero; qw[1] first, ahg mode already in from init */
605 desc->qw[1] |= ((u64)type & SDMA_DESC1_GENERATION_MASK)
606 << SDMA_DESC1_GENERATION_SHIFT;
609 desc->qw[1] = ((u64)type & SDMA_DESC1_GENERATION_MASK)
610 << SDMA_DESC1_GENERATION_SHIFT;
612 desc->qw[0] |= (((u64)addr & SDMA_DESC0_PHY_ADDR_MASK)
613 << SDMA_DESC0_PHY_ADDR_SHIFT) |
614 (((u64)len & SDMA_DESC0_BYTE_COUNT_MASK)
615 << SDMA_DESC0_BYTE_COUNT_SHIFT);
616 desc->pinning_ctx = pinning_ctx;
619 /* helper to extend txreq */
620 int ext_coal_sdma_tx_descs(struct hfi1_devdata *dd, struct sdma_txreq *tx,
621 int type, void *kvaddr, struct page *page,
622 unsigned long offset, u16 len);
623 int _pad_sdma_tx_descs(struct hfi1_devdata *, struct sdma_txreq *);
624 void __sdma_txclean(struct hfi1_devdata *, struct sdma_txreq *);
626 static inline void sdma_txclean(struct hfi1_devdata *dd, struct sdma_txreq *tx)
629 __sdma_txclean(dd, tx);
632 /* helpers used by public routines */
633 static inline void _sdma_close_tx(struct hfi1_devdata *dd,
634 struct sdma_txreq *tx)
636 u16 last_desc = tx->num_desc - 1;
638 tx->descp[last_desc].qw[0] |= SDMA_DESC0_LAST_DESC_FLAG;
639 tx->descp[last_desc].qw[1] |= dd->default_desc1;
640 if (tx->flags & SDMA_TXREQ_F_URGENT)
641 tx->descp[last_desc].qw[1] |= (SDMA_DESC1_HEAD_TO_HOST_FLAG |
642 SDMA_DESC1_INT_REQ_FLAG);
645 static inline int _sdma_txadd_daddr(
646 struct hfi1_devdata *dd,
649 struct sdma_txreq *tx,
660 WARN_ON(len > tx->tlen);
663 /* special cases for last */
665 if (tx->packet_len & (sizeof(u32) - 1)) {
666 rval = _pad_sdma_tx_descs(dd, tx);
670 _sdma_close_tx(dd, tx);
677 * sdma_txadd_page() - add a page to the sdma_txreq
678 * @dd: the device to use for mapping
679 * @pinning_ctx: context to be released at descriptor retirement
680 * @tx: tx request to which the page is added
682 * @offset: offset within the page
683 * @len: length in bytes
685 * This is used to add a page/offset/length descriptor.
687 * The mapping/unmapping of the page/offset/len is automatically handled.
690 * 0 - success, -ENOSPC - mapping fail, -ENOMEM - couldn't
691 * extend/coalesce descriptor array
693 static inline int sdma_txadd_page(
694 struct hfi1_devdata *dd,
696 struct sdma_txreq *tx,
698 unsigned long offset,
704 if ((unlikely(tx->num_desc == tx->desc_limit))) {
705 rval = ext_coal_sdma_tx_descs(dd, tx, SDMA_MAP_PAGE,
706 NULL, page, offset, len);
718 if (unlikely(dma_mapping_error(&dd->pcidev->dev, addr))) {
719 __sdma_txclean(dd, tx);
723 return _sdma_txadd_daddr(dd, SDMA_MAP_PAGE, pinning_ctx, tx, addr, len);
727 * sdma_txadd_daddr() - add a dma address to the sdma_txreq
728 * @dd: the device to use for mapping
729 * @tx: sdma_txreq to which the page is added
730 * @addr: dma address mapped by caller
731 * @len: length in bytes
733 * This is used to add a descriptor for memory that is already dma mapped.
735 * In this case, there is no unmapping as part of the progress processing for
736 * this memory location.
739 * 0 - success, -ENOMEM - couldn't extend descriptor array
742 static inline int sdma_txadd_daddr(
743 struct hfi1_devdata *dd,
744 struct sdma_txreq *tx,
750 if ((unlikely(tx->num_desc == tx->desc_limit))) {
751 rval = ext_coal_sdma_tx_descs(dd, tx, SDMA_MAP_NONE,
757 return _sdma_txadd_daddr(dd, SDMA_MAP_NONE, NULL, tx,
762 * sdma_txadd_kvaddr() - add a kernel virtual address to sdma_txreq
763 * @dd: the device to use for mapping
764 * @tx: sdma_txreq to which the page is added
765 * @kvaddr: the kernel virtual address
766 * @len: length in bytes
768 * This is used to add a descriptor referenced by the indicated kvaddr and
771 * The mapping/unmapping of the kvaddr and len is automatically handled.
774 * 0 - success, -ENOSPC - mapping fail, -ENOMEM - couldn't extend/coalesce
777 static inline int sdma_txadd_kvaddr(
778 struct hfi1_devdata *dd,
779 struct sdma_txreq *tx,
786 if ((unlikely(tx->num_desc == tx->desc_limit))) {
787 rval = ext_coal_sdma_tx_descs(dd, tx, SDMA_MAP_SINGLE,
788 kvaddr, NULL, 0, len);
793 addr = dma_map_single(
799 if (unlikely(dma_mapping_error(&dd->pcidev->dev, addr))) {
800 __sdma_txclean(dd, tx);
804 return _sdma_txadd_daddr(dd, SDMA_MAP_SINGLE, NULL, tx, addr, len);
809 int sdma_send_txreq(struct sdma_engine *sde,
810 struct iowait_work *wait,
811 struct sdma_txreq *tx,
813 int sdma_send_txlist(struct sdma_engine *sde,
814 struct iowait_work *wait,
815 struct list_head *tx_list,
818 int sdma_ahg_alloc(struct sdma_engine *sde);
819 void sdma_ahg_free(struct sdma_engine *sde, int ahg_index);
822 * sdma_build_ahg - build ahg descriptor
828 * Build and return a 32 bit descriptor.
830 static inline u32 sdma_build_ahg_descriptor(
836 return (u32)(1UL << SDMA_AHG_UPDATE_ENABLE_SHIFT |
837 ((startbit & SDMA_AHG_FIELD_START_MASK) <<
838 SDMA_AHG_FIELD_START_SHIFT) |
839 ((bits & SDMA_AHG_FIELD_LEN_MASK) <<
840 SDMA_AHG_FIELD_LEN_SHIFT) |
841 ((dwindex & SDMA_AHG_INDEX_MASK) <<
842 SDMA_AHG_INDEX_SHIFT) |
843 ((data & SDMA_AHG_VALUE_MASK) <<
844 SDMA_AHG_VALUE_SHIFT));
848 * sdma_progress - use seq number of detect head progress
849 * @sde: sdma_engine to check
850 * @seq: base seq count
851 * @tx: txreq for which we need to check descriptor availability
853 * This is used in the appropriate spot in the sleep routine
854 * to check for potential ring progress. This routine gets the
855 * seqcount before queuing the iowait structure for progress.
857 * If the seqcount indicates that progress needs to be checked,
858 * re-submission is detected by checking whether the descriptor
859 * queue has enough descriptor for the txreq.
861 static inline unsigned sdma_progress(struct sdma_engine *sde, unsigned seq,
862 struct sdma_txreq *tx)
864 if (read_seqretry(&sde->head_lock, seq)) {
865 sde->desc_avail = sdma_descq_freecnt(sde);
866 if (tx->num_desc > sde->desc_avail)
873 /* for use by interrupt handling */
874 void sdma_engine_error(struct sdma_engine *sde, u64 status);
875 void sdma_engine_interrupt(struct sdma_engine *sde, u64 status);
879 * The diagram below details the relationship of the mapping structures
881 * Since the mapping now allows for non-uniform engines per vl, the
882 * number of engines for a vl is either the vl_engines[vl] or
883 * a computation based on num_sdma/num_vls:
886 * nactual = vl_engines ? vl_engines[vl] : num_sdma/num_vls
888 * n = roundup to next highest power of 2 using nactual
890 * In the case where there are num_sdma/num_vls doesn't divide
891 * evenly, the extras are added from the last vl downward.
893 * For the case where n > nactual, the engines are assigned
894 * in a round robin fashion wrapping back to the first engine
895 * for a particular vl.
899 * | +--------------------+
901 * sdma_vl_map |--------------------|
902 * +--------------------------+ | sde[0] -> eng 1 |
903 * | list (RCU) | |--------------------|
904 * |--------------------------| ->| sde[1] -> eng 2 |
905 * | mask | --/ |--------------------|
906 * |--------------------------| -/ | * |
907 * | actual_vls (max 8) | -/ |--------------------|
908 * |--------------------------| --/ | sde[n-1] -> eng n |
909 * | vls (max 8) | -/ +--------------------+
910 * |--------------------------| --/
912 * |--------------------------| +---------------------+
913 * | map[1] |--- | mask |
914 * |--------------------------| \---- |---------------------|
915 * | * | \-- | sde[0] -> eng 1+n |
916 * | * | \---- |---------------------|
917 * | * | \->| sde[1] -> eng 2+n |
918 * |--------------------------| |---------------------|
919 * | map[vls - 1] |- | * |
920 * +--------------------------+ \- |---------------------|
921 * \- | sde[m-1] -> eng m+n |
922 * \ +---------------------+
925 * \- +----------------------+
927 * \ |----------------------|
928 * \- | sde[0] -> eng 1+m+n |
929 * \- |----------------------|
930 * >| sde[1] -> eng 2+m+n |
931 * |----------------------|
933 * |----------------------|
934 * | sde[o-1] -> eng o+m+n|
935 * +----------------------+
940 * struct sdma_map_elem - mapping for a vl
941 * @mask - selector mask
942 * @sde - array of engines for this vl
944 * The mask is used to "mod" the selector
945 * to produce index into the trailing
948 struct sdma_map_elem {
950 struct sdma_engine *sde[];
954 * struct sdma_map_el - mapping for a vl
955 * @engine_to_vl - map of an engine to a vl
956 * @list - rcu head for free callback
957 * @mask - vl mask to "mod" the vl to produce an index to map array
958 * @actual_vls - number of vls
959 * @vls - number of vls rounded to next power of 2
960 * @map - array of sdma_map_elem entries
962 * This is the parent mapping structure. The trailing
963 * members of the struct point to sdma_map_elem entries, which
964 * in turn point to an array of sde's for that vl.
967 s8 engine_to_vl[TXE_NUM_SDMA_ENGINES];
968 struct rcu_head list;
972 struct sdma_map_elem *map[];
976 struct hfi1_devdata *dd,
982 void _sdma_engine_progress_schedule(struct sdma_engine *sde);
985 * sdma_engine_progress_schedule() - schedule progress on engine
986 * @sde: sdma_engine to schedule progress
988 * This is the fast path.
991 static inline void sdma_engine_progress_schedule(
992 struct sdma_engine *sde)
994 if (!sde || sdma_descq_inprocess(sde) < (sde->descq_cnt / 8))
996 _sdma_engine_progress_schedule(sde);
999 struct sdma_engine *sdma_select_engine_sc(
1000 struct hfi1_devdata *dd,
1004 struct sdma_engine *sdma_select_engine_vl(
1005 struct hfi1_devdata *dd,
1009 struct sdma_engine *sdma_select_user_engine(struct hfi1_devdata *dd,
1010 u32 selector, u8 vl);
1011 ssize_t sdma_get_cpu_to_sde_map(struct sdma_engine *sde, char *buf);
1012 ssize_t sdma_set_cpu_to_sde_map(struct sdma_engine *sde, const char *buf,
1014 int sdma_engine_get_vl(struct sdma_engine *sde);
1015 void sdma_seqfile_dump_sde(struct seq_file *s, struct sdma_engine *);
1016 void sdma_seqfile_dump_cpu_list(struct seq_file *s, struct hfi1_devdata *dd,
1017 unsigned long cpuid);
1019 #ifdef CONFIG_SDMA_VERBOSITY
1020 void sdma_dumpstate(struct sdma_engine *);
1022 static inline char *slashstrip(char *s)
1032 u16 sdma_get_descq_cnt(void);
1034 extern uint mod_num_sdma;
1036 void sdma_update_lmc(struct hfi1_devdata *dd, u64 mask, u32 lid);
1038 void system_descriptor_complete(struct hfi1_devdata *dd, struct sdma_desc *descp);