2 * Linux for s390 qdio support, buffer handling, qdio API and module support.
4 * Copyright IBM Corp. 2000, 2008
5 * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
6 * Jan Glauber <jang@linux.vnet.ibm.com>
7 * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/timer.h>
13 #include <linux/delay.h>
14 #include <linux/gfp.h>
16 #include <linux/atomic.h>
17 #include <asm/debug.h>
25 #include "qdio_debug.h"
27 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
28 "Jan Glauber <jang@linux.vnet.ibm.com>");
29 MODULE_DESCRIPTION("QDIO base support");
30 MODULE_LICENSE("GPL");
32 static inline int do_siga_sync(unsigned long schid
,
33 unsigned int out_mask
, unsigned int in_mask
,
36 register unsigned long __fc
asm ("0") = fc
;
37 register unsigned long __schid
asm ("1") = schid
;
38 register unsigned long out
asm ("2") = out_mask
;
39 register unsigned long in
asm ("3") = in_mask
;
47 : "d" (__fc
), "d" (__schid
), "d" (out
), "d" (in
) : "cc");
51 static inline int do_siga_input(unsigned long schid
, unsigned int mask
,
54 register unsigned long __fc
asm ("0") = fc
;
55 register unsigned long __schid
asm ("1") = schid
;
56 register unsigned long __mask
asm ("2") = mask
;
64 : "d" (__fc
), "d" (__schid
), "d" (__mask
) : "cc");
69 * do_siga_output - perform SIGA-w/wt function
70 * @schid: subchannel id or in case of QEBSM the subchannel token
71 * @mask: which output queues to process
72 * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
73 * @fc: function code to perform
75 * Returns condition code.
76 * Note: For IQDC unicast queues only the highest priority queue is processed.
78 static inline int do_siga_output(unsigned long schid
, unsigned long mask
,
79 unsigned int *bb
, unsigned int fc
,
82 register unsigned long __fc
asm("0") = fc
;
83 register unsigned long __schid
asm("1") = schid
;
84 register unsigned long __mask
asm("2") = mask
;
85 register unsigned long __aob
asm("3") = aob
;
92 : "=d" (cc
), "+d" (__fc
), "+d" (__aob
)
93 : "d" (__schid
), "d" (__mask
)
99 static inline int qdio_check_ccq(struct qdio_q
*q
, unsigned int ccq
)
101 /* all done or next buffer state different */
102 if (ccq
== 0 || ccq
== 32)
104 /* no buffer processed */
107 /* not all buffers processed */
110 /* notify devices immediately */
111 DBF_ERROR("%4x ccq:%3d", SCH_NO(q
), ccq
);
116 * qdio_do_eqbs - extract buffer states for QEBSM
117 * @q: queue to manipulate
118 * @state: state of the extracted buffers
119 * @start: buffer number to start at
120 * @count: count of buffers to examine
121 * @auto_ack: automatically acknowledge buffers
123 * Returns the number of successfully extracted equal buffer states.
124 * Stops processing if a state is different from the last buffers state.
126 static int qdio_do_eqbs(struct qdio_q
*q
, unsigned char *state
,
127 int start
, int count
, int auto_ack
)
129 int rc
, tmp_count
= count
, tmp_start
= start
, nr
= q
->nr
, retried
= 0;
130 unsigned int ccq
= 0;
135 nr
+= q
->irq_ptr
->nr_input_qs
;
137 ccq
= do_eqbs(q
->irq_ptr
->sch_token
, state
, nr
, &tmp_start
, &tmp_count
,
139 rc
= qdio_check_ccq(q
, ccq
);
141 return count
- tmp_count
;
144 DBF_DEV_EVENT(DBF_WARN
, q
->irq_ptr
, "EQBS again:%2d", ccq
);
149 qperf_inc(q
, eqbs_partial
);
150 DBF_DEV_EVENT(DBF_WARN
, q
->irq_ptr
, "EQBS part:%02x",
153 * Retry once, if that fails bail out and process the
154 * extracted buffers before trying again.
159 return count
- tmp_count
;
162 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q
));
163 DBF_ERROR("%3d%3d%2d", count
, tmp_count
, nr
);
164 q
->handler(q
->irq_ptr
->cdev
, QDIO_ERROR_GET_BUF_STATE
,
165 q
->nr
, q
->first_to_kick
, count
, q
->irq_ptr
->int_parm
);
170 * qdio_do_sqbs - set buffer states for QEBSM
171 * @q: queue to manipulate
172 * @state: new state of the buffers
173 * @start: first buffer number to change
174 * @count: how many buffers to change
176 * Returns the number of successfully changed buffers.
177 * Does retrying until the specified count of buffer states is set or an
180 static int qdio_do_sqbs(struct qdio_q
*q
, unsigned char state
, int start
,
183 unsigned int ccq
= 0;
184 int tmp_count
= count
, tmp_start
= start
;
193 nr
+= q
->irq_ptr
->nr_input_qs
;
195 ccq
= do_sqbs(q
->irq_ptr
->sch_token
, state
, nr
, &tmp_start
, &tmp_count
);
196 rc
= qdio_check_ccq(q
, ccq
);
198 WARN_ON_ONCE(tmp_count
);
199 return count
- tmp_count
;
202 if (rc
== 1 || rc
== 2) {
203 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "SQBS again:%2d", ccq
);
204 qperf_inc(q
, sqbs_partial
);
208 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q
));
209 DBF_ERROR("%3d%3d%2d", count
, tmp_count
, nr
);
210 q
->handler(q
->irq_ptr
->cdev
, QDIO_ERROR_SET_BUF_STATE
,
211 q
->nr
, q
->first_to_kick
, count
, q
->irq_ptr
->int_parm
);
215 /* returns number of examined buffers and their common state in *state */
216 static inline int get_buf_states(struct qdio_q
*q
, unsigned int bufnr
,
217 unsigned char *state
, unsigned int count
,
218 int auto_ack
, int merge_pending
)
220 unsigned char __state
= 0;
224 return qdio_do_eqbs(q
, state
, bufnr
, count
, auto_ack
);
226 for (i
= 0; i
< count
; i
++) {
228 __state
= q
->slsb
.val
[bufnr
];
229 if (merge_pending
&& __state
== SLSB_P_OUTPUT_PENDING
)
230 __state
= SLSB_P_OUTPUT_EMPTY
;
231 } else if (merge_pending
) {
232 if ((q
->slsb
.val
[bufnr
] & __state
) != __state
)
234 } else if (q
->slsb
.val
[bufnr
] != __state
)
236 bufnr
= next_buf(bufnr
);
242 static inline int get_buf_state(struct qdio_q
*q
, unsigned int bufnr
,
243 unsigned char *state
, int auto_ack
)
245 return get_buf_states(q
, bufnr
, state
, 1, auto_ack
, 0);
248 /* wrap-around safe setting of slsb states, returns number of changed buffers */
249 static inline int set_buf_states(struct qdio_q
*q
, int bufnr
,
250 unsigned char state
, int count
)
255 return qdio_do_sqbs(q
, state
, bufnr
, count
);
257 for (i
= 0; i
< count
; i
++) {
258 xchg(&q
->slsb
.val
[bufnr
], state
);
259 bufnr
= next_buf(bufnr
);
264 static inline int set_buf_state(struct qdio_q
*q
, int bufnr
,
267 return set_buf_states(q
, bufnr
, state
, 1);
270 /* set slsb states to initial state */
271 static void qdio_init_buf_states(struct qdio_irq
*irq_ptr
)
276 for_each_input_queue(irq_ptr
, q
, i
)
277 set_buf_states(q
, 0, SLSB_P_INPUT_NOT_INIT
,
278 QDIO_MAX_BUFFERS_PER_Q
);
279 for_each_output_queue(irq_ptr
, q
, i
)
280 set_buf_states(q
, 0, SLSB_P_OUTPUT_NOT_INIT
,
281 QDIO_MAX_BUFFERS_PER_Q
);
284 static inline int qdio_siga_sync(struct qdio_q
*q
, unsigned int output
,
287 unsigned long schid
= *((u32
*) &q
->irq_ptr
->schid
);
288 unsigned int fc
= QDIO_SIGA_SYNC
;
291 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "siga-s:%1d", q
->nr
);
292 qperf_inc(q
, siga_sync
);
295 schid
= q
->irq_ptr
->sch_token
;
296 fc
|= QDIO_SIGA_QEBSM_FLAG
;
299 cc
= do_siga_sync(schid
, output
, input
, fc
);
301 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q
), cc
);
302 return (cc
) ? -EIO
: 0;
305 static inline int qdio_siga_sync_q(struct qdio_q
*q
)
308 return qdio_siga_sync(q
, 0, q
->mask
);
310 return qdio_siga_sync(q
, q
->mask
, 0);
313 static int qdio_siga_output(struct qdio_q
*q
, unsigned int *busy_bit
,
316 unsigned long schid
= *((u32
*) &q
->irq_ptr
->schid
);
317 unsigned int fc
= QDIO_SIGA_WRITE
;
320 unsigned long laob
= 0;
322 WARN_ON_ONCE(aob
&& ((queue_type(q
) != QDIO_IQDIO_QFMT
) ||
324 if (q
->u
.out
.use_cq
&& aob
!= 0) {
325 fc
= QDIO_SIGA_WRITEQ
;
330 schid
= q
->irq_ptr
->sch_token
;
331 fc
|= QDIO_SIGA_QEBSM_FLAG
;
334 cc
= do_siga_output(schid
, q
->mask
, busy_bit
, fc
, laob
);
336 /* hipersocket busy condition */
337 if (unlikely(*busy_bit
)) {
341 start_time
= get_tod_clock_fast();
344 if (get_tod_clock_fast() - start_time
< QDIO_BUSY_BIT_PATIENCE
)
348 DBF_DEV_EVENT(DBF_WARN
, q
->irq_ptr
,
349 "%4x cc2 BB1:%1d", SCH_NO(q
), q
->nr
);
350 DBF_DEV_EVENT(DBF_WARN
, q
->irq_ptr
, "count:%u", retries
);
355 static inline int qdio_siga_input(struct qdio_q
*q
)
357 unsigned long schid
= *((u32
*) &q
->irq_ptr
->schid
);
358 unsigned int fc
= QDIO_SIGA_READ
;
361 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "siga-r:%1d", q
->nr
);
362 qperf_inc(q
, siga_read
);
365 schid
= q
->irq_ptr
->sch_token
;
366 fc
|= QDIO_SIGA_QEBSM_FLAG
;
369 cc
= do_siga_input(schid
, q
->mask
, fc
);
371 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q
), cc
);
372 return (cc
) ? -EIO
: 0;
375 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
376 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
378 static inline void qdio_sync_queues(struct qdio_q
*q
)
380 /* PCI capable outbound queues will also be scanned so sync them too */
381 if (pci_out_supported(q
))
382 qdio_siga_sync_all(q
);
387 int debug_get_buf_state(struct qdio_q
*q
, unsigned int bufnr
,
388 unsigned char *state
)
390 if (need_siga_sync(q
))
392 return get_buf_states(q
, bufnr
, state
, 1, 0, 0);
395 static inline void qdio_stop_polling(struct qdio_q
*q
)
397 if (!q
->u
.in
.polling
)
401 qperf_inc(q
, stop_polling
);
403 /* show the card that we are not polling anymore */
405 set_buf_states(q
, q
->u
.in
.ack_start
, SLSB_P_INPUT_NOT_INIT
,
407 q
->u
.in
.ack_count
= 0;
409 set_buf_state(q
, q
->u
.in
.ack_start
, SLSB_P_INPUT_NOT_INIT
);
412 static inline void account_sbals(struct qdio_q
*q
, unsigned int count
)
416 q
->q_stats
.nr_sbal_total
+= count
;
417 if (count
== QDIO_MAX_BUFFERS_MASK
) {
418 q
->q_stats
.nr_sbals
[7]++;
422 q
->q_stats
.nr_sbals
[pos
]++;
425 static void process_buffer_error(struct qdio_q
*q
, int count
)
427 unsigned char state
= (q
->is_input_q
) ? SLSB_P_INPUT_NOT_INIT
:
428 SLSB_P_OUTPUT_NOT_INIT
;
430 q
->qdio_error
= QDIO_ERROR_SLSB_STATE
;
432 /* special handling for no target buffer empty */
433 if ((!q
->is_input_q
&&
434 (q
->sbal
[q
->first_to_check
]->element
[15].sflags
) == 0x10)) {
435 qperf_inc(q
, target_full
);
436 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "OUTFULL FTC:%02x",
441 DBF_ERROR("%4x BUF ERROR", SCH_NO(q
));
442 DBF_ERROR((q
->is_input_q
) ? "IN:%2d" : "OUT:%2d", q
->nr
);
443 DBF_ERROR("FTC:%3d C:%3d", q
->first_to_check
, count
);
444 DBF_ERROR("F14:%2x F15:%2x",
445 q
->sbal
[q
->first_to_check
]->element
[14].sflags
,
446 q
->sbal
[q
->first_to_check
]->element
[15].sflags
);
450 * Interrupts may be avoided as long as the error is present
451 * so change the buffer state immediately to avoid starvation.
453 set_buf_states(q
, q
->first_to_check
, state
, count
);
456 static inline void inbound_primed(struct qdio_q
*q
, int count
)
460 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "in prim: %02x", count
);
462 /* for QEBSM the ACK was already set by EQBS */
464 if (!q
->u
.in
.polling
) {
466 q
->u
.in
.ack_count
= count
;
467 q
->u
.in
.ack_start
= q
->first_to_check
;
471 /* delete the previous ACK's */
472 set_buf_states(q
, q
->u
.in
.ack_start
, SLSB_P_INPUT_NOT_INIT
,
474 q
->u
.in
.ack_count
= count
;
475 q
->u
.in
.ack_start
= q
->first_to_check
;
480 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
481 * or by the next inbound run.
483 new = add_buf(q
->first_to_check
, count
- 1);
484 if (q
->u
.in
.polling
) {
485 /* reset the previous ACK but first set the new one */
486 set_buf_state(q
, new, SLSB_P_INPUT_ACK
);
487 set_buf_state(q
, q
->u
.in
.ack_start
, SLSB_P_INPUT_NOT_INIT
);
490 set_buf_state(q
, new, SLSB_P_INPUT_ACK
);
493 q
->u
.in
.ack_start
= new;
497 /* need to change ALL buffers to get more interrupts */
498 set_buf_states(q
, q
->first_to_check
, SLSB_P_INPUT_NOT_INIT
, count
);
501 static int get_inbound_buffer_frontier(struct qdio_q
*q
)
504 unsigned char state
= 0;
506 q
->timestamp
= get_tod_clock_fast();
509 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
512 count
= min(atomic_read(&q
->nr_buf_used
), QDIO_MAX_BUFFERS_MASK
);
513 stop
= add_buf(q
->first_to_check
, count
);
515 if (q
->first_to_check
== stop
)
519 * No siga sync here, as a PCI or we after a thin interrupt
520 * already sync'ed the queues.
522 count
= get_buf_states(q
, q
->first_to_check
, &state
, count
, 1, 0);
527 case SLSB_P_INPUT_PRIMED
:
528 inbound_primed(q
, count
);
529 q
->first_to_check
= add_buf(q
->first_to_check
, count
);
530 if (atomic_sub_return(count
, &q
->nr_buf_used
) == 0)
531 qperf_inc(q
, inbound_queue_full
);
532 if (q
->irq_ptr
->perf_stat_enabled
)
533 account_sbals(q
, count
);
535 case SLSB_P_INPUT_ERROR
:
536 process_buffer_error(q
, count
);
537 q
->first_to_check
= add_buf(q
->first_to_check
, count
);
538 atomic_sub(count
, &q
->nr_buf_used
);
539 if (q
->irq_ptr
->perf_stat_enabled
)
540 account_sbals_error(q
, count
);
542 case SLSB_CU_INPUT_EMPTY
:
543 case SLSB_P_INPUT_NOT_INIT
:
544 case SLSB_P_INPUT_ACK
:
545 if (q
->irq_ptr
->perf_stat_enabled
)
546 q
->q_stats
.nr_sbal_nop
++;
547 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "in nop");
553 return q
->first_to_check
;
556 static int qdio_inbound_q_moved(struct qdio_q
*q
)
560 bufnr
= get_inbound_buffer_frontier(q
);
562 if (bufnr
!= q
->last_move
) {
563 q
->last_move
= bufnr
;
564 if (!is_thinint_irq(q
->irq_ptr
) && MACHINE_IS_LPAR
)
565 q
->u
.in
.timestamp
= get_tod_clock();
571 static inline int qdio_inbound_q_done(struct qdio_q
*q
)
573 unsigned char state
= 0;
575 if (!atomic_read(&q
->nr_buf_used
))
578 if (need_siga_sync(q
))
580 get_buf_state(q
, q
->first_to_check
, &state
, 0);
582 if (state
== SLSB_P_INPUT_PRIMED
|| state
== SLSB_P_INPUT_ERROR
)
583 /* more work coming */
586 if (is_thinint_irq(q
->irq_ptr
))
589 /* don't poll under z/VM */
594 * At this point we know, that inbound first_to_check
595 * has (probably) not moved (see qdio_inbound_processing).
597 if (get_tod_clock_fast() > q
->u
.in
.timestamp
+ QDIO_INPUT_THRESHOLD
) {
598 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "in done:%02x",
605 static inline int contains_aobs(struct qdio_q
*q
)
607 return !q
->is_input_q
&& q
->u
.out
.use_cq
;
610 static inline void qdio_handle_aobs(struct qdio_q
*q
, int start
, int count
)
612 unsigned char state
= 0;
615 if (!contains_aobs(q
))
618 for (j
= 0; j
< count
; ++j
) {
619 get_buf_state(q
, b
, &state
, 0);
620 if (state
== SLSB_P_OUTPUT_PENDING
) {
621 struct qaob
*aob
= q
->u
.out
.aobs
[b
];
625 q
->u
.out
.sbal_state
[b
].flags
|=
626 QDIO_OUTBUF_STATE_FLAG_PENDING
;
627 q
->u
.out
.aobs
[b
] = NULL
;
628 } else if (state
== SLSB_P_OUTPUT_EMPTY
) {
629 q
->u
.out
.sbal_state
[b
].aob
= NULL
;
635 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q
*q
,
638 unsigned long phys_aob
= 0;
643 if (!q
->aobs
[bufnr
]) {
644 struct qaob
*aob
= qdio_allocate_aob();
645 q
->aobs
[bufnr
] = aob
;
647 if (q
->aobs
[bufnr
]) {
648 q
->sbal_state
[bufnr
].flags
= QDIO_OUTBUF_STATE_FLAG_NONE
;
649 q
->sbal_state
[bufnr
].aob
= q
->aobs
[bufnr
];
650 q
->aobs
[bufnr
]->user1
= (u64
) q
->sbal_state
[bufnr
].user
;
651 phys_aob
= virt_to_phys(q
->aobs
[bufnr
]);
652 WARN_ON_ONCE(phys_aob
& 0xFF);
659 static void qdio_kick_handler(struct qdio_q
*q
)
661 int start
= q
->first_to_kick
;
662 int end
= q
->first_to_check
;
665 if (unlikely(q
->irq_ptr
->state
!= QDIO_IRQ_STATE_ACTIVE
))
668 count
= sub_buf(end
, start
);
671 qperf_inc(q
, inbound_handler
);
672 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "kih s:%02x c:%02x", start
, count
);
674 qperf_inc(q
, outbound_handler
);
675 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "koh: s:%02x c:%02x",
679 qdio_handle_aobs(q
, start
, count
);
681 q
->handler(q
->irq_ptr
->cdev
, q
->qdio_error
, q
->nr
, start
, count
,
682 q
->irq_ptr
->int_parm
);
684 /* for the next time */
685 q
->first_to_kick
= end
;
689 static void __qdio_inbound_processing(struct qdio_q
*q
)
691 qperf_inc(q
, tasklet_inbound
);
693 if (!qdio_inbound_q_moved(q
))
696 qdio_kick_handler(q
);
698 if (!qdio_inbound_q_done(q
)) {
699 /* means poll time is not yet over */
700 qperf_inc(q
, tasklet_inbound_resched
);
701 if (likely(q
->irq_ptr
->state
!= QDIO_IRQ_STATE_STOPPED
)) {
702 tasklet_schedule(&q
->tasklet
);
707 qdio_stop_polling(q
);
709 * We need to check again to not lose initiative after
710 * resetting the ACK state.
712 if (!qdio_inbound_q_done(q
)) {
713 qperf_inc(q
, tasklet_inbound_resched2
);
714 if (likely(q
->irq_ptr
->state
!= QDIO_IRQ_STATE_STOPPED
))
715 tasklet_schedule(&q
->tasklet
);
719 void qdio_inbound_processing(unsigned long data
)
721 struct qdio_q
*q
= (struct qdio_q
*)data
;
722 __qdio_inbound_processing(q
);
725 static int get_outbound_buffer_frontier(struct qdio_q
*q
)
728 unsigned char state
= 0;
730 q
->timestamp
= get_tod_clock_fast();
732 if (need_siga_sync(q
))
733 if (((queue_type(q
) != QDIO_IQDIO_QFMT
) &&
734 !pci_out_supported(q
)) ||
735 (queue_type(q
) == QDIO_IQDIO_QFMT
&&
736 multicast_outbound(q
)))
740 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
743 count
= min(atomic_read(&q
->nr_buf_used
), QDIO_MAX_BUFFERS_MASK
);
744 stop
= add_buf(q
->first_to_check
, count
);
745 if (q
->first_to_check
== stop
)
748 count
= get_buf_states(q
, q
->first_to_check
, &state
, count
, 0, 1);
753 case SLSB_P_OUTPUT_EMPTY
:
754 /* the adapter got it */
755 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
,
756 "out empty:%1d %02x", q
->nr
, count
);
758 atomic_sub(count
, &q
->nr_buf_used
);
759 q
->first_to_check
= add_buf(q
->first_to_check
, count
);
760 if (q
->irq_ptr
->perf_stat_enabled
)
761 account_sbals(q
, count
);
764 case SLSB_P_OUTPUT_ERROR
:
765 process_buffer_error(q
, count
);
766 q
->first_to_check
= add_buf(q
->first_to_check
, count
);
767 atomic_sub(count
, &q
->nr_buf_used
);
768 if (q
->irq_ptr
->perf_stat_enabled
)
769 account_sbals_error(q
, count
);
771 case SLSB_CU_OUTPUT_PRIMED
:
772 /* the adapter has not fetched the output yet */
773 if (q
->irq_ptr
->perf_stat_enabled
)
774 q
->q_stats
.nr_sbal_nop
++;
775 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "out primed:%1d",
778 case SLSB_P_OUTPUT_NOT_INIT
:
779 case SLSB_P_OUTPUT_HALTED
:
786 return q
->first_to_check
;
789 /* all buffers processed? */
790 static inline int qdio_outbound_q_done(struct qdio_q
*q
)
792 return atomic_read(&q
->nr_buf_used
) == 0;
795 static inline int qdio_outbound_q_moved(struct qdio_q
*q
)
799 bufnr
= get_outbound_buffer_frontier(q
);
801 if (bufnr
!= q
->last_move
) {
802 q
->last_move
= bufnr
;
803 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "out moved:%1d", q
->nr
);
809 static int qdio_kick_outbound_q(struct qdio_q
*q
, unsigned long aob
)
812 unsigned int busy_bit
;
814 if (!need_siga_out(q
))
817 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "siga-w:%1d", q
->nr
);
819 qperf_inc(q
, siga_write
);
821 cc
= qdio_siga_output(q
, &busy_bit
, aob
);
827 while (++retries
< QDIO_BUSY_BIT_RETRIES
) {
828 mdelay(QDIO_BUSY_BIT_RETRY_DELAY
);
831 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q
), q
->nr
);
834 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "siga-w cc2:%1d", q
->nr
);
840 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q
), cc
);
845 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q
), q
->nr
);
846 DBF_ERROR("count:%u", retries
);
851 static void __qdio_outbound_processing(struct qdio_q
*q
)
853 qperf_inc(q
, tasklet_outbound
);
854 WARN_ON_ONCE(atomic_read(&q
->nr_buf_used
) < 0);
856 if (qdio_outbound_q_moved(q
))
857 qdio_kick_handler(q
);
859 if (queue_type(q
) == QDIO_ZFCP_QFMT
)
860 if (!pci_out_supported(q
) && !qdio_outbound_q_done(q
))
863 if (q
->u
.out
.pci_out_enabled
)
867 * Now we know that queue type is either qeth without pci enabled
868 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
869 * is noticed and outbound_handler is called after some time.
871 if (qdio_outbound_q_done(q
))
872 del_timer(&q
->u
.out
.timer
);
874 if (!timer_pending(&q
->u
.out
.timer
))
875 mod_timer(&q
->u
.out
.timer
, jiffies
+ 10 * HZ
);
879 if (unlikely(q
->irq_ptr
->state
== QDIO_IRQ_STATE_STOPPED
))
881 tasklet_schedule(&q
->tasklet
);
884 /* outbound tasklet */
885 void qdio_outbound_processing(unsigned long data
)
887 struct qdio_q
*q
= (struct qdio_q
*)data
;
888 __qdio_outbound_processing(q
);
891 void qdio_outbound_timer(unsigned long data
)
893 struct qdio_q
*q
= (struct qdio_q
*)data
;
895 if (unlikely(q
->irq_ptr
->state
== QDIO_IRQ_STATE_STOPPED
))
897 tasklet_schedule(&q
->tasklet
);
900 static inline void qdio_check_outbound_after_thinint(struct qdio_q
*q
)
905 if (!pci_out_supported(q
))
908 for_each_output_queue(q
->irq_ptr
, out
, i
)
909 if (!qdio_outbound_q_done(out
))
910 tasklet_schedule(&out
->tasklet
);
913 static void __tiqdio_inbound_processing(struct qdio_q
*q
)
915 qperf_inc(q
, tasklet_inbound
);
916 if (need_siga_sync(q
) && need_siga_sync_after_ai(q
))
920 * The interrupt could be caused by a PCI request. Check the
921 * PCI capable outbound queues.
923 qdio_check_outbound_after_thinint(q
);
925 if (!qdio_inbound_q_moved(q
))
928 qdio_kick_handler(q
);
930 if (!qdio_inbound_q_done(q
)) {
931 qperf_inc(q
, tasklet_inbound_resched
);
932 if (likely(q
->irq_ptr
->state
!= QDIO_IRQ_STATE_STOPPED
)) {
933 tasklet_schedule(&q
->tasklet
);
938 qdio_stop_polling(q
);
940 * We need to check again to not lose initiative after
941 * resetting the ACK state.
943 if (!qdio_inbound_q_done(q
)) {
944 qperf_inc(q
, tasklet_inbound_resched2
);
945 if (likely(q
->irq_ptr
->state
!= QDIO_IRQ_STATE_STOPPED
))
946 tasklet_schedule(&q
->tasklet
);
950 void tiqdio_inbound_processing(unsigned long data
)
952 struct qdio_q
*q
= (struct qdio_q
*)data
;
953 __tiqdio_inbound_processing(q
);
956 static inline void qdio_set_state(struct qdio_irq
*irq_ptr
,
957 enum qdio_irq_states state
)
959 DBF_DEV_EVENT(DBF_INFO
, irq_ptr
, "newstate: %1d", state
);
961 irq_ptr
->state
= state
;
965 static void qdio_irq_check_sense(struct qdio_irq
*irq_ptr
, struct irb
*irb
)
967 if (irb
->esw
.esw0
.erw
.cons
) {
968 DBF_ERROR("%4x sense:", irq_ptr
->schid
.sch_no
);
969 DBF_ERROR_HEX(irb
, 64);
970 DBF_ERROR_HEX(irb
->ecw
, 64);
974 /* PCI interrupt handler */
975 static void qdio_int_handler_pci(struct qdio_irq
*irq_ptr
)
980 if (unlikely(irq_ptr
->state
== QDIO_IRQ_STATE_STOPPED
))
983 for_each_input_queue(irq_ptr
, q
, i
) {
984 if (q
->u
.in
.queue_start_poll
) {
985 /* skip if polling is enabled or already in work */
986 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED
,
987 &q
->u
.in
.queue_irq_state
)) {
988 qperf_inc(q
, int_discarded
);
991 q
->u
.in
.queue_start_poll(q
->irq_ptr
->cdev
, q
->nr
,
992 q
->irq_ptr
->int_parm
);
994 tasklet_schedule(&q
->tasklet
);
998 if (!(irq_ptr
->qib
.ac
& QIB_AC_OUTBOUND_PCI_SUPPORTED
))
1001 for_each_output_queue(irq_ptr
, q
, i
) {
1002 if (qdio_outbound_q_done(q
))
1004 if (need_siga_sync(q
) && need_siga_sync_out_after_pci(q
))
1005 qdio_siga_sync_q(q
);
1006 tasklet_schedule(&q
->tasklet
);
1010 static void qdio_handle_activate_check(struct ccw_device
*cdev
,
1011 unsigned long intparm
, int cstat
, int dstat
)
1013 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1017 DBF_ERROR("%4x ACT CHECK", irq_ptr
->schid
.sch_no
);
1018 DBF_ERROR("intp :%lx", intparm
);
1019 DBF_ERROR("ds: %2x cs:%2x", dstat
, cstat
);
1021 if (irq_ptr
->nr_input_qs
) {
1022 q
= irq_ptr
->input_qs
[0];
1023 } else if (irq_ptr
->nr_output_qs
) {
1024 q
= irq_ptr
->output_qs
[0];
1030 count
= sub_buf(q
->first_to_check
, q
->first_to_kick
);
1031 q
->handler(q
->irq_ptr
->cdev
, QDIO_ERROR_ACTIVATE
,
1032 q
->nr
, q
->first_to_kick
, count
, irq_ptr
->int_parm
);
1034 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_STOPPED
);
1036 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1037 * Therefore we call the LGR detection function here.
1042 static void qdio_establish_handle_irq(struct ccw_device
*cdev
, int cstat
,
1045 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1047 DBF_DEV_EVENT(DBF_INFO
, irq_ptr
, "qest irq");
1051 if (dstat
& ~(DEV_STAT_DEV_END
| DEV_STAT_CHN_END
))
1053 if (!(dstat
& DEV_STAT_DEV_END
))
1055 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_ESTABLISHED
);
1059 DBF_ERROR("%4x EQ:error", irq_ptr
->schid
.sch_no
);
1060 DBF_ERROR("ds: %2x cs:%2x", dstat
, cstat
);
1061 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_ERR
);
1064 /* qdio interrupt handler */
1065 void qdio_int_handler(struct ccw_device
*cdev
, unsigned long intparm
,
1068 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1071 if (!intparm
|| !irq_ptr
) {
1072 DBF_ERROR("qint:%4x", cdev
->private->schid
.sch_no
);
1076 if (irq_ptr
->perf_stat_enabled
)
1077 irq_ptr
->perf_stat
.qdio_int
++;
1080 DBF_ERROR("%4x IO error", irq_ptr
->schid
.sch_no
);
1081 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_ERR
);
1082 wake_up(&cdev
->private->wait_q
);
1085 qdio_irq_check_sense(irq_ptr
, irb
);
1086 cstat
= irb
->scsw
.cmd
.cstat
;
1087 dstat
= irb
->scsw
.cmd
.dstat
;
1089 switch (irq_ptr
->state
) {
1090 case QDIO_IRQ_STATE_INACTIVE
:
1091 qdio_establish_handle_irq(cdev
, cstat
, dstat
);
1093 case QDIO_IRQ_STATE_CLEANUP
:
1094 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_INACTIVE
);
1096 case QDIO_IRQ_STATE_ESTABLISHED
:
1097 case QDIO_IRQ_STATE_ACTIVE
:
1098 if (cstat
& SCHN_STAT_PCI
) {
1099 qdio_int_handler_pci(irq_ptr
);
1103 qdio_handle_activate_check(cdev
, intparm
, cstat
,
1106 case QDIO_IRQ_STATE_STOPPED
:
1111 wake_up(&cdev
->private->wait_q
);
1115 * qdio_get_ssqd_desc - get qdio subchannel description
1116 * @cdev: ccw device to get description for
1117 * @data: where to store the ssqd
1119 * Returns 0 or an error code. The results of the chsc are stored in the
1120 * specified structure.
1122 int qdio_get_ssqd_desc(struct ccw_device
*cdev
,
1123 struct qdio_ssqd_desc
*data
)
1126 if (!cdev
|| !cdev
->private)
1129 DBF_EVENT("get ssqd:%4x", cdev
->private->schid
.sch_no
);
1130 return qdio_setup_get_ssqd(NULL
, &cdev
->private->schid
, data
);
1132 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc
);
1134 static void qdio_shutdown_queues(struct ccw_device
*cdev
)
1136 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1140 for_each_input_queue(irq_ptr
, q
, i
)
1141 tasklet_kill(&q
->tasklet
);
1143 for_each_output_queue(irq_ptr
, q
, i
) {
1144 del_timer(&q
->u
.out
.timer
);
1145 tasklet_kill(&q
->tasklet
);
1150 * qdio_shutdown - shut down a qdio subchannel
1151 * @cdev: associated ccw device
1152 * @how: use halt or clear to shutdown
1154 int qdio_shutdown(struct ccw_device
*cdev
, int how
)
1156 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1158 unsigned long flags
;
1163 WARN_ON_ONCE(irqs_disabled());
1164 DBF_EVENT("qshutdown:%4x", cdev
->private->schid
.sch_no
);
1166 mutex_lock(&irq_ptr
->setup_mutex
);
1168 * Subchannel was already shot down. We cannot prevent being called
1169 * twice since cio may trigger a shutdown asynchronously.
1171 if (irq_ptr
->state
== QDIO_IRQ_STATE_INACTIVE
) {
1172 mutex_unlock(&irq_ptr
->setup_mutex
);
1177 * Indicate that the device is going down. Scheduling the queue
1178 * tasklets is forbidden from here on.
1180 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_STOPPED
);
1182 tiqdio_remove_input_queues(irq_ptr
);
1183 qdio_shutdown_queues(cdev
);
1184 qdio_shutdown_debug_entries(irq_ptr
);
1186 /* cleanup subchannel */
1187 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1189 if (how
& QDIO_FLAG_CLEANUP_USING_CLEAR
)
1190 rc
= ccw_device_clear(cdev
, QDIO_DOING_CLEANUP
);
1192 /* default behaviour is halt */
1193 rc
= ccw_device_halt(cdev
, QDIO_DOING_CLEANUP
);
1195 DBF_ERROR("%4x SHUTD ERR", irq_ptr
->schid
.sch_no
);
1196 DBF_ERROR("rc:%4d", rc
);
1200 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_CLEANUP
);
1201 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1202 wait_event_interruptible_timeout(cdev
->private->wait_q
,
1203 irq_ptr
->state
== QDIO_IRQ_STATE_INACTIVE
||
1204 irq_ptr
->state
== QDIO_IRQ_STATE_ERR
,
1206 spin_lock_irqsave(get_ccwdev_lock(cdev
), flags
);
1209 qdio_shutdown_thinint(irq_ptr
);
1211 /* restore interrupt handler */
1212 if ((void *)cdev
->handler
== (void *)qdio_int_handler
)
1213 cdev
->handler
= irq_ptr
->orig_handler
;
1214 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), flags
);
1216 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_INACTIVE
);
1217 mutex_unlock(&irq_ptr
->setup_mutex
);
1222 EXPORT_SYMBOL_GPL(qdio_shutdown
);
1225 * qdio_free - free data structures for a qdio subchannel
1226 * @cdev: associated ccw device
1228 int qdio_free(struct ccw_device
*cdev
)
1230 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1235 DBF_EVENT("qfree:%4x", cdev
->private->schid
.sch_no
);
1236 DBF_DEV_EVENT(DBF_ERR
, irq_ptr
, "dbf abandoned");
1237 mutex_lock(&irq_ptr
->setup_mutex
);
1239 irq_ptr
->debug_area
= NULL
;
1240 cdev
->private->qdio_data
= NULL
;
1241 mutex_unlock(&irq_ptr
->setup_mutex
);
1243 qdio_release_memory(irq_ptr
);
1246 EXPORT_SYMBOL_GPL(qdio_free
);
1249 * qdio_allocate - allocate qdio queues and associated data
1250 * @init_data: initialization data
1252 int qdio_allocate(struct qdio_initialize
*init_data
)
1254 struct qdio_irq
*irq_ptr
;
1256 DBF_EVENT("qallocate:%4x", init_data
->cdev
->private->schid
.sch_no
);
1258 if ((init_data
->no_input_qs
&& !init_data
->input_handler
) ||
1259 (init_data
->no_output_qs
&& !init_data
->output_handler
))
1262 if ((init_data
->no_input_qs
> QDIO_MAX_QUEUES_PER_IRQ
) ||
1263 (init_data
->no_output_qs
> QDIO_MAX_QUEUES_PER_IRQ
))
1266 if ((!init_data
->input_sbal_addr_array
) ||
1267 (!init_data
->output_sbal_addr_array
))
1270 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1271 irq_ptr
= (void *) get_zeroed_page(GFP_KERNEL
| GFP_DMA
);
1275 mutex_init(&irq_ptr
->setup_mutex
);
1276 if (qdio_allocate_dbf(init_data
, irq_ptr
))
1280 * Allocate a page for the chsc calls in qdio_establish.
1281 * Must be pre-allocated since a zfcp recovery will call
1282 * qdio_establish. In case of low memory and swap on a zfcp disk
1283 * we may not be able to allocate memory otherwise.
1285 irq_ptr
->chsc_page
= get_zeroed_page(GFP_KERNEL
);
1286 if (!irq_ptr
->chsc_page
)
1289 /* qdr is used in ccw1.cda which is u32 */
1290 irq_ptr
->qdr
= (struct qdr
*) get_zeroed_page(GFP_KERNEL
| GFP_DMA
);
1294 if (qdio_allocate_qs(irq_ptr
, init_data
->no_input_qs
,
1295 init_data
->no_output_qs
))
1298 init_data
->cdev
->private->qdio_data
= irq_ptr
;
1299 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_INACTIVE
);
1302 qdio_release_memory(irq_ptr
);
1306 EXPORT_SYMBOL_GPL(qdio_allocate
);
1308 static void qdio_detect_hsicq(struct qdio_irq
*irq_ptr
)
1310 struct qdio_q
*q
= irq_ptr
->input_qs
[0];
1313 if (irq_ptr
->nr_input_qs
> 1 && queue_type(q
) == QDIO_IQDIO_QFMT
)
1316 for_each_output_queue(irq_ptr
, q
, i
) {
1318 if (qdio_enable_async_operation(&q
->u
.out
) < 0) {
1323 qdio_disable_async_operation(&q
->u
.out
);
1325 DBF_EVENT("use_cq:%d", use_cq
);
1329 * qdio_establish - establish queues on a qdio subchannel
1330 * @init_data: initialization data
1332 int qdio_establish(struct qdio_initialize
*init_data
)
1334 struct qdio_irq
*irq_ptr
;
1335 struct ccw_device
*cdev
= init_data
->cdev
;
1336 unsigned long saveflags
;
1339 DBF_EVENT("qestablish:%4x", cdev
->private->schid
.sch_no
);
1341 irq_ptr
= cdev
->private->qdio_data
;
1345 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1348 mutex_lock(&irq_ptr
->setup_mutex
);
1349 qdio_setup_irq(init_data
);
1351 rc
= qdio_establish_thinint(irq_ptr
);
1353 mutex_unlock(&irq_ptr
->setup_mutex
);
1354 qdio_shutdown(cdev
, QDIO_FLAG_CLEANUP_USING_CLEAR
);
1359 irq_ptr
->ccw
.cmd_code
= irq_ptr
->equeue
.cmd
;
1360 irq_ptr
->ccw
.flags
= CCW_FLAG_SLI
;
1361 irq_ptr
->ccw
.count
= irq_ptr
->equeue
.count
;
1362 irq_ptr
->ccw
.cda
= (u32
)((addr_t
)irq_ptr
->qdr
);
1364 spin_lock_irqsave(get_ccwdev_lock(cdev
), saveflags
);
1365 ccw_device_set_options_mask(cdev
, 0);
1367 rc
= ccw_device_start(cdev
, &irq_ptr
->ccw
, QDIO_DOING_ESTABLISH
, 0, 0);
1369 DBF_ERROR("%4x est IO ERR", irq_ptr
->schid
.sch_no
);
1370 DBF_ERROR("rc:%4x", rc
);
1372 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), saveflags
);
1375 mutex_unlock(&irq_ptr
->setup_mutex
);
1376 qdio_shutdown(cdev
, QDIO_FLAG_CLEANUP_USING_CLEAR
);
1380 wait_event_interruptible_timeout(cdev
->private->wait_q
,
1381 irq_ptr
->state
== QDIO_IRQ_STATE_ESTABLISHED
||
1382 irq_ptr
->state
== QDIO_IRQ_STATE_ERR
, HZ
);
1384 if (irq_ptr
->state
!= QDIO_IRQ_STATE_ESTABLISHED
) {
1385 mutex_unlock(&irq_ptr
->setup_mutex
);
1386 qdio_shutdown(cdev
, QDIO_FLAG_CLEANUP_USING_CLEAR
);
1390 qdio_setup_ssqd_info(irq_ptr
);
1392 qdio_detect_hsicq(irq_ptr
);
1394 /* qebsm is now setup if available, initialize buffer states */
1395 qdio_init_buf_states(irq_ptr
);
1397 mutex_unlock(&irq_ptr
->setup_mutex
);
1398 qdio_print_subchannel_info(irq_ptr
, cdev
);
1399 qdio_setup_debug_entries(irq_ptr
, cdev
);
1402 EXPORT_SYMBOL_GPL(qdio_establish
);
1405 * qdio_activate - activate queues on a qdio subchannel
1406 * @cdev: associated cdev
1408 int qdio_activate(struct ccw_device
*cdev
)
1410 struct qdio_irq
*irq_ptr
;
1412 unsigned long saveflags
;
1414 DBF_EVENT("qactivate:%4x", cdev
->private->schid
.sch_no
);
1416 irq_ptr
= cdev
->private->qdio_data
;
1420 if (cdev
->private->state
!= DEV_STATE_ONLINE
)
1423 mutex_lock(&irq_ptr
->setup_mutex
);
1424 if (irq_ptr
->state
== QDIO_IRQ_STATE_INACTIVE
) {
1429 irq_ptr
->ccw
.cmd_code
= irq_ptr
->aqueue
.cmd
;
1430 irq_ptr
->ccw
.flags
= CCW_FLAG_SLI
;
1431 irq_ptr
->ccw
.count
= irq_ptr
->aqueue
.count
;
1432 irq_ptr
->ccw
.cda
= 0;
1434 spin_lock_irqsave(get_ccwdev_lock(cdev
), saveflags
);
1435 ccw_device_set_options(cdev
, CCWDEV_REPORT_ALL
);
1437 rc
= ccw_device_start(cdev
, &irq_ptr
->ccw
, QDIO_DOING_ACTIVATE
,
1438 0, DOIO_DENY_PREFETCH
);
1440 DBF_ERROR("%4x act IO ERR", irq_ptr
->schid
.sch_no
);
1441 DBF_ERROR("rc:%4x", rc
);
1443 spin_unlock_irqrestore(get_ccwdev_lock(cdev
), saveflags
);
1448 if (is_thinint_irq(irq_ptr
))
1449 tiqdio_add_input_queues(irq_ptr
);
1451 /* wait for subchannel to become active */
1454 switch (irq_ptr
->state
) {
1455 case QDIO_IRQ_STATE_STOPPED
:
1456 case QDIO_IRQ_STATE_ERR
:
1460 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_ACTIVE
);
1464 mutex_unlock(&irq_ptr
->setup_mutex
);
1467 EXPORT_SYMBOL_GPL(qdio_activate
);
1469 static inline int buf_in_between(int bufnr
, int start
, int count
)
1471 int end
= add_buf(start
, count
);
1474 if (bufnr
>= start
&& bufnr
< end
)
1480 /* wrap-around case */
1481 if ((bufnr
>= start
&& bufnr
<= QDIO_MAX_BUFFERS_PER_Q
) ||
1489 * handle_inbound - reset processed input buffers
1490 * @q: queue containing the buffers
1492 * @bufnr: first buffer to process
1493 * @count: how many buffers are emptied
1495 static int handle_inbound(struct qdio_q
*q
, unsigned int callflags
,
1496 int bufnr
, int count
)
1500 qperf_inc(q
, inbound_call
);
1502 if (!q
->u
.in
.polling
)
1505 /* protect against stop polling setting an ACK for an emptied slsb */
1506 if (count
== QDIO_MAX_BUFFERS_PER_Q
) {
1507 /* overwriting everything, just delete polling status */
1508 q
->u
.in
.polling
= 0;
1509 q
->u
.in
.ack_count
= 0;
1511 } else if (buf_in_between(q
->u
.in
.ack_start
, bufnr
, count
)) {
1513 /* partial overwrite, just update ack_start */
1514 diff
= add_buf(bufnr
, count
);
1515 diff
= sub_buf(diff
, q
->u
.in
.ack_start
);
1516 q
->u
.in
.ack_count
-= diff
;
1517 if (q
->u
.in
.ack_count
<= 0) {
1518 q
->u
.in
.polling
= 0;
1519 q
->u
.in
.ack_count
= 0;
1522 q
->u
.in
.ack_start
= add_buf(q
->u
.in
.ack_start
, diff
);
1525 /* the only ACK will be deleted, so stop polling */
1526 q
->u
.in
.polling
= 0;
1530 count
= set_buf_states(q
, bufnr
, SLSB_CU_INPUT_EMPTY
, count
);
1531 atomic_add(count
, &q
->nr_buf_used
);
1533 if (need_siga_in(q
))
1534 return qdio_siga_input(q
);
1540 * handle_outbound - process filled outbound buffers
1541 * @q: queue containing the buffers
1543 * @bufnr: first buffer to process
1544 * @count: how many buffers are filled
1546 static int handle_outbound(struct qdio_q
*q
, unsigned int callflags
,
1547 int bufnr
, int count
)
1549 unsigned char state
= 0;
1552 qperf_inc(q
, outbound_call
);
1554 count
= set_buf_states(q
, bufnr
, SLSB_CU_OUTPUT_PRIMED
, count
);
1555 used
= atomic_add_return(count
, &q
->nr_buf_used
);
1557 if (used
== QDIO_MAX_BUFFERS_PER_Q
)
1558 qperf_inc(q
, outbound_queue_full
);
1560 if (callflags
& QDIO_FLAG_PCI_OUT
) {
1561 q
->u
.out
.pci_out_enabled
= 1;
1562 qperf_inc(q
, pci_request_int
);
1564 q
->u
.out
.pci_out_enabled
= 0;
1566 if (queue_type(q
) == QDIO_IQDIO_QFMT
) {
1567 unsigned long phys_aob
= 0;
1569 /* One SIGA-W per buffer required for unicast HSI */
1570 WARN_ON_ONCE(count
> 1 && !multicast_outbound(q
));
1572 phys_aob
= qdio_aob_for_buffer(&q
->u
.out
, bufnr
);
1574 rc
= qdio_kick_outbound_q(q
, phys_aob
);
1575 } else if (need_siga_sync(q
)) {
1576 rc
= qdio_siga_sync_q(q
);
1578 /* try to fast requeue buffers */
1579 get_buf_state(q
, prev_buf(bufnr
), &state
, 0);
1580 if (state
!= SLSB_CU_OUTPUT_PRIMED
)
1581 rc
= qdio_kick_outbound_q(q
, 0);
1583 qperf_inc(q
, fast_requeue
);
1586 /* in case of SIGA errors we must process the error immediately */
1587 if (used
>= q
->u
.out
.scan_threshold
|| rc
)
1588 tasklet_schedule(&q
->tasklet
);
1590 /* free the SBALs in case of no further traffic */
1591 if (!timer_pending(&q
->u
.out
.timer
))
1592 mod_timer(&q
->u
.out
.timer
, jiffies
+ HZ
);
1597 * do_QDIO - process input or output buffers
1598 * @cdev: associated ccw_device for the qdio subchannel
1599 * @callflags: input or output and special flags from the program
1600 * @q_nr: queue number
1601 * @bufnr: buffer number
1602 * @count: how many buffers to process
1604 int do_QDIO(struct ccw_device
*cdev
, unsigned int callflags
,
1605 int q_nr
, unsigned int bufnr
, unsigned int count
)
1607 struct qdio_irq
*irq_ptr
;
1609 if (bufnr
>= QDIO_MAX_BUFFERS_PER_Q
|| count
> QDIO_MAX_BUFFERS_PER_Q
)
1612 irq_ptr
= cdev
->private->qdio_data
;
1616 DBF_DEV_EVENT(DBF_INFO
, irq_ptr
,
1617 "do%02x b:%02x c:%02x", callflags
, bufnr
, count
);
1619 if (irq_ptr
->state
!= QDIO_IRQ_STATE_ACTIVE
)
1623 if (callflags
& QDIO_FLAG_SYNC_INPUT
)
1624 return handle_inbound(irq_ptr
->input_qs
[q_nr
],
1625 callflags
, bufnr
, count
);
1626 else if (callflags
& QDIO_FLAG_SYNC_OUTPUT
)
1627 return handle_outbound(irq_ptr
->output_qs
[q_nr
],
1628 callflags
, bufnr
, count
);
1631 EXPORT_SYMBOL_GPL(do_QDIO
);
1634 * qdio_start_irq - process input buffers
1635 * @cdev: associated ccw_device for the qdio subchannel
1636 * @nr: input queue number
1640 * 1 - irqs not started since new data is available
1642 int qdio_start_irq(struct ccw_device
*cdev
, int nr
)
1645 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1649 q
= irq_ptr
->input_qs
[nr
];
1651 clear_nonshared_ind(irq_ptr
);
1652 qdio_stop_polling(q
);
1653 clear_bit(QDIO_QUEUE_IRQS_DISABLED
, &q
->u
.in
.queue_irq_state
);
1656 * We need to check again to not lose initiative after
1657 * resetting the ACK state.
1659 if (test_nonshared_ind(irq_ptr
))
1661 if (!qdio_inbound_q_done(q
))
1666 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED
,
1667 &q
->u
.in
.queue_irq_state
))
1673 EXPORT_SYMBOL(qdio_start_irq
);
1676 * qdio_get_next_buffers - process input buffers
1677 * @cdev: associated ccw_device for the qdio subchannel
1678 * @nr: input queue number
1679 * @bufnr: first filled buffer number
1680 * @error: buffers are in error state
1684 * = 0 - no new buffers found
1685 * > 0 - number of processed buffers
1687 int qdio_get_next_buffers(struct ccw_device
*cdev
, int nr
, int *bufnr
,
1692 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1696 q
= irq_ptr
->input_qs
[nr
];
1699 * Cannot rely on automatic sync after interrupt since queues may
1700 * also be examined without interrupt.
1702 if (need_siga_sync(q
))
1703 qdio_sync_queues(q
);
1705 /* check the PCI capable outbound queues. */
1706 qdio_check_outbound_after_thinint(q
);
1708 if (!qdio_inbound_q_moved(q
))
1711 /* Note: upper-layer MUST stop processing immediately here ... */
1712 if (unlikely(q
->irq_ptr
->state
!= QDIO_IRQ_STATE_ACTIVE
))
1715 start
= q
->first_to_kick
;
1716 end
= q
->first_to_check
;
1718 *error
= q
->qdio_error
;
1720 /* for the next time */
1721 q
->first_to_kick
= end
;
1723 return sub_buf(end
, start
);
1725 EXPORT_SYMBOL(qdio_get_next_buffers
);
1728 * qdio_stop_irq - disable interrupt processing for the device
1729 * @cdev: associated ccw_device for the qdio subchannel
1730 * @nr: input queue number
1733 * 0 - interrupts were already disabled
1734 * 1 - interrupts successfully disabled
1736 int qdio_stop_irq(struct ccw_device
*cdev
, int nr
)
1739 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1743 q
= irq_ptr
->input_qs
[nr
];
1745 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED
,
1746 &q
->u
.in
.queue_irq_state
))
1751 EXPORT_SYMBOL(qdio_stop_irq
);
1754 * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info.
1755 * @schid: Subchannel ID.
1756 * @cnc: Boolean Change-Notification Control
1757 * @response: Response code will be stored at this address
1758 * @cb: Callback function will be executed for each element
1759 * of the address list
1760 * @priv: Pointer passed from the caller to qdio_pnso_brinfo()
1761 * @type: Type of the address entry passed to the callback
1762 * @entry: Entry containg the address of the specified type
1763 * @priv: Pointer to pass to the callback function.
1765 * Performs "Store-network-bridging-information list" operation and calls
1766 * the callback function for every entry in the list. If "change-
1767 * notification-control" is set, further changes in the address list
1768 * will be reported via the IPA command.
1770 int qdio_pnso_brinfo(struct subchannel_id schid
,
1771 int cnc
, u16
*response
,
1772 void (*cb
)(void *priv
, enum qdio_brinfo_entry_type type
,
1776 struct chsc_pnso_area
*rr
;
1778 u32 prev_instance
= 0;
1779 int isfirstblock
= 1;
1782 rr
= (struct chsc_pnso_area
*)get_zeroed_page(GFP_KERNEL
);
1786 /* on the first iteration, naihdr.resume_token will be zero */
1787 rc
= chsc_pnso_brinfo(schid
, rr
, rr
->naihdr
.resume_token
, cnc
);
1788 if (rc
!= 0 && rc
!= -EBUSY
)
1790 if (rr
->response
.code
!= 1) {
1799 size
= rr
->naihdr
.naids
;
1800 elems
= (rr
->response
.length
-
1801 sizeof(struct chsc_header
) -
1802 sizeof(struct chsc_brinfo_naihdr
)) /
1805 if (!isfirstblock
&& (rr
->naihdr
.instance
!= prev_instance
)) {
1806 /* Inform the caller that they need to scrap */
1807 /* the data that was already reported via cb */
1812 prev_instance
= rr
->naihdr
.instance
;
1813 for (i
= 0; i
< elems
; i
++)
1815 case sizeof(struct qdio_brinfo_entry_l3_ipv6
):
1816 (*cb
)(priv
, l3_ipv6_addr
,
1817 &rr
->entries
.l3_ipv6
[i
]);
1819 case sizeof(struct qdio_brinfo_entry_l3_ipv4
):
1820 (*cb
)(priv
, l3_ipv4_addr
,
1821 &rr
->entries
.l3_ipv4
[i
]);
1823 case sizeof(struct qdio_brinfo_entry_l2
):
1824 (*cb
)(priv
, l2_addr_lnid
,
1825 &rr
->entries
.l2
[i
]);
1832 } while (rr
->response
.code
== 0x0107 || /* channel busy */
1833 (rr
->response
.code
== 1 && /* list stored */
1834 /* resume token is non-zero => list incomplete */
1835 (rr
->naihdr
.resume_token
.t1
|| rr
->naihdr
.resume_token
.t2
)));
1836 (*response
) = rr
->response
.code
;
1839 free_page((unsigned long)rr
);
1842 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo
);
1844 static int __init
init_QDIO(void)
1848 rc
= qdio_debug_init();
1851 rc
= qdio_setup_init();
1854 rc
= tiqdio_allocate_memory();
1857 rc
= tiqdio_register_thinints();
1863 tiqdio_free_memory();
1871 static void __exit
exit_QDIO(void)
1873 tiqdio_unregister_thinints();
1874 tiqdio_free_memory();
1879 module_init(init_QDIO
);
1880 module_exit(exit_QDIO
);