1 // SPDX-License-Identifier: GPL-2.0
3 * Linux for s390 qdio support, buffer handling, qdio API and module support.
5 * Copyright IBM Corp. 2000, 2008
6 * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
7 * Jan Glauber <jang@linux.vnet.ibm.com>
8 * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/timer.h>
14 #include <linux/delay.h>
15 #include <linux/gfp.h>
17 #include <linux/atomic.h>
18 #include <asm/debug.h>
26 #include "qdio_debug.h"
28 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
29 "Jan Glauber <jang@linux.vnet.ibm.com>");
30 MODULE_DESCRIPTION("QDIO base support");
31 MODULE_LICENSE("GPL");
33 static inline int do_siga_sync(unsigned long schid
,
34 unsigned int out_mask
, unsigned int in_mask
,
37 register unsigned long __fc
asm ("0") = fc
;
38 register unsigned long __schid
asm ("1") = schid
;
39 register unsigned long out
asm ("2") = out_mask
;
40 register unsigned long in
asm ("3") = in_mask
;
48 : "d" (__fc
), "d" (__schid
), "d" (out
), "d" (in
) : "cc");
52 static inline int do_siga_input(unsigned long schid
, unsigned int mask
,
55 register unsigned long __fc
asm ("0") = fc
;
56 register unsigned long __schid
asm ("1") = schid
;
57 register unsigned long __mask
asm ("2") = mask
;
65 : "d" (__fc
), "d" (__schid
), "d" (__mask
) : "cc");
70 * do_siga_output - perform SIGA-w/wt function
71 * @schid: subchannel id or in case of QEBSM the subchannel token
72 * @mask: which output queues to process
73 * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
74 * @fc: function code to perform
75 * @aob: asynchronous operation block
77 * Returns condition code.
78 * Note: For IQDC unicast queues only the highest priority queue is processed.
80 static inline int do_siga_output(unsigned long schid
, unsigned long mask
,
81 unsigned int *bb
, unsigned int fc
,
84 register unsigned long __fc
asm("0") = fc
;
85 register unsigned long __schid
asm("1") = schid
;
86 register unsigned long __mask
asm("2") = mask
;
87 register unsigned long __aob
asm("3") = aob
;
94 : "=d" (cc
), "+d" (__fc
), "+d" (__aob
)
95 : "d" (__schid
), "d" (__mask
)
102 * qdio_do_eqbs - extract buffer states for QEBSM
103 * @q: queue to manipulate
104 * @state: state of the extracted buffers
105 * @start: buffer number to start at
106 * @count: count of buffers to examine
107 * @auto_ack: automatically acknowledge buffers
109 * Returns the number of successfully extracted equal buffer states.
110 * Stops processing if a state is different from the last buffers state.
112 static int qdio_do_eqbs(struct qdio_q
*q
, unsigned char *state
,
113 int start
, int count
, int auto_ack
)
115 int tmp_count
= count
, tmp_start
= start
, nr
= q
->nr
;
116 unsigned int ccq
= 0;
121 nr
+= q
->irq_ptr
->nr_input_qs
;
123 ccq
= do_eqbs(q
->irq_ptr
->sch_token
, state
, nr
, &tmp_start
, &tmp_count
,
129 /* all done, or next buffer state different */
130 return count
- tmp_count
;
132 /* not all buffers processed */
133 qperf_inc(q
, eqbs_partial
);
134 DBF_DEV_EVENT(DBF_WARN
, q
->irq_ptr
, "EQBS part:%02x",
136 return count
- tmp_count
;
138 /* no buffer processed */
139 DBF_DEV_EVENT(DBF_WARN
, q
->irq_ptr
, "EQBS again:%2d", ccq
);
142 DBF_ERROR("%4x ccq:%3d", SCH_NO(q
), ccq
);
143 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q
));
144 DBF_ERROR("%3d%3d%2d", count
, tmp_count
, nr
);
145 q
->handler(q
->irq_ptr
->cdev
, QDIO_ERROR_GET_BUF_STATE
, q
->nr
,
146 q
->first_to_kick
, count
, q
->irq_ptr
->int_parm
);
152 * qdio_do_sqbs - set buffer states for QEBSM
153 * @q: queue to manipulate
154 * @state: new state of the buffers
155 * @start: first buffer number to change
156 * @count: how many buffers to change
158 * Returns the number of successfully changed buffers.
159 * Does retrying until the specified count of buffer states is set or an
162 static int qdio_do_sqbs(struct qdio_q
*q
, unsigned char state
, int start
,
165 unsigned int ccq
= 0;
166 int tmp_count
= count
, tmp_start
= start
;
174 nr
+= q
->irq_ptr
->nr_input_qs
;
176 ccq
= do_sqbs(q
->irq_ptr
->sch_token
, state
, nr
, &tmp_start
, &tmp_count
);
181 /* all done, or active buffer adapter-owned */
182 WARN_ON_ONCE(tmp_count
);
183 return count
- tmp_count
;
185 /* not all buffers processed */
186 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "SQBS again:%2d", ccq
);
187 qperf_inc(q
, sqbs_partial
);
190 DBF_ERROR("%4x ccq:%3d", SCH_NO(q
), ccq
);
191 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q
));
192 DBF_ERROR("%3d%3d%2d", count
, tmp_count
, nr
);
193 q
->handler(q
->irq_ptr
->cdev
, QDIO_ERROR_SET_BUF_STATE
, q
->nr
,
194 q
->first_to_kick
, count
, q
->irq_ptr
->int_parm
);
200 * Returns number of examined buffers and their common state in *state.
201 * Requested number of buffers-to-examine must be > 0.
203 static inline int get_buf_states(struct qdio_q
*q
, unsigned int bufnr
,
204 unsigned char *state
, unsigned int count
,
205 int auto_ack
, int merge_pending
)
207 unsigned char __state
= 0;
211 return qdio_do_eqbs(q
, state
, bufnr
, count
, auto_ack
);
213 /* get initial state: */
214 __state
= q
->slsb
.val
[bufnr
];
216 /* Bail out early if there is no work on the queue: */
217 if (__state
& SLSB_OWNER_CU
)
220 if (merge_pending
&& __state
== SLSB_P_OUTPUT_PENDING
)
221 __state
= SLSB_P_OUTPUT_EMPTY
;
223 for (; i
< count
; i
++) {
224 bufnr
= next_buf(bufnr
);
226 /* merge PENDING into EMPTY: */
228 q
->slsb
.val
[bufnr
] == SLSB_P_OUTPUT_PENDING
&&
229 __state
== SLSB_P_OUTPUT_EMPTY
)
232 /* stop if next state differs from initial state: */
233 if (q
->slsb
.val
[bufnr
] != __state
)
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 count
,
314 unsigned int *busy_bit
, unsigned long aob
)
316 unsigned long schid
= *((u32
*) &q
->irq_ptr
->schid
);
317 unsigned int fc
= QDIO_SIGA_WRITE
;
321 if (queue_type(q
) == QDIO_IQDIO_QFMT
&& !multicast_outbound(q
)) {
323 fc
= QDIO_SIGA_WRITEM
;
325 fc
= QDIO_SIGA_WRITEQ
;
329 schid
= q
->irq_ptr
->sch_token
;
330 fc
|= QDIO_SIGA_QEBSM_FLAG
;
333 cc
= do_siga_output(schid
, q
->mask
, busy_bit
, fc
, aob
);
335 /* hipersocket busy condition */
336 if (unlikely(*busy_bit
)) {
340 start_time
= get_tod_clock_fast();
343 if (get_tod_clock_fast() - start_time
< QDIO_BUSY_BIT_PATIENCE
)
347 DBF_DEV_EVENT(DBF_WARN
, q
->irq_ptr
,
348 "%4x cc2 BB1:%1d", SCH_NO(q
), q
->nr
);
349 DBF_DEV_EVENT(DBF_WARN
, q
->irq_ptr
, "count:%u", retries
);
354 static inline int qdio_siga_input(struct qdio_q
*q
)
356 unsigned long schid
= *((u32
*) &q
->irq_ptr
->schid
);
357 unsigned int fc
= QDIO_SIGA_READ
;
360 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "siga-r:%1d", q
->nr
);
361 qperf_inc(q
, siga_read
);
364 schid
= q
->irq_ptr
->sch_token
;
365 fc
|= QDIO_SIGA_QEBSM_FLAG
;
368 cc
= do_siga_input(schid
, q
->mask
, fc
);
370 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q
), cc
);
371 return (cc
) ? -EIO
: 0;
374 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
375 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
377 static inline void qdio_sync_queues(struct qdio_q
*q
)
379 /* PCI capable outbound queues will also be scanned so sync them too */
380 if (pci_out_supported(q
->irq_ptr
))
381 qdio_siga_sync_all(q
);
386 int debug_get_buf_state(struct qdio_q
*q
, unsigned int bufnr
,
387 unsigned char *state
)
389 if (need_siga_sync(q
))
391 return get_buf_state(q
, bufnr
, state
, 0);
394 static inline void qdio_stop_polling(struct qdio_q
*q
)
396 if (!q
->u
.in
.polling
)
400 qperf_inc(q
, stop_polling
);
402 /* show the card that we are not polling anymore */
404 set_buf_states(q
, q
->u
.in
.ack_start
, SLSB_P_INPUT_NOT_INIT
,
406 q
->u
.in
.ack_count
= 0;
408 set_buf_state(q
, q
->u
.in
.ack_start
, SLSB_P_INPUT_NOT_INIT
);
411 static inline void account_sbals(struct qdio_q
*q
, unsigned int count
)
415 q
->q_stats
.nr_sbal_total
+= count
;
416 if (count
== QDIO_MAX_BUFFERS_MASK
) {
417 q
->q_stats
.nr_sbals
[7]++;
421 q
->q_stats
.nr_sbals
[pos
]++;
424 static void process_buffer_error(struct qdio_q
*q
, unsigned int start
,
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 (queue_type(q
) == QDIO_IQDIO_QFMT
&& !q
->is_input_q
&&
434 q
->sbal
[start
]->element
[15].sflags
== 0x10) {
435 qperf_inc(q
, target_full
);
436 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "OUTFULL FTC:%02x", start
);
440 DBF_ERROR("%4x BUF ERROR", SCH_NO(q
));
441 DBF_ERROR((q
->is_input_q
) ? "IN:%2d" : "OUT:%2d", q
->nr
);
442 DBF_ERROR("FTC:%3d C:%3d", start
, count
);
443 DBF_ERROR("F14:%2x F15:%2x",
444 q
->sbal
[start
]->element
[14].sflags
,
445 q
->sbal
[start
]->element
[15].sflags
);
449 * Interrupts may be avoided as long as the error is present
450 * so change the buffer state immediately to avoid starvation.
452 set_buf_states(q
, start
, state
, count
);
455 static inline void inbound_primed(struct qdio_q
*q
, unsigned int start
,
460 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "in prim:%1d %02x", q
->nr
, 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
= start
;
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
= start
;
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(start
, 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
, start
, SLSB_P_INPUT_NOT_INIT
, count
);
501 static int get_inbound_buffer_frontier(struct qdio_q
*q
, unsigned int start
)
503 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
);
517 * No siga sync here, as a PCI or we after a thin interrupt
518 * already sync'ed the queues.
520 count
= get_buf_states(q
, start
, &state
, count
, 1, 0);
525 case SLSB_P_INPUT_PRIMED
:
526 inbound_primed(q
, start
, count
);
527 if (atomic_sub_return(count
, &q
->nr_buf_used
) == 0)
528 qperf_inc(q
, inbound_queue_full
);
529 if (q
->irq_ptr
->perf_stat_enabled
)
530 account_sbals(q
, count
);
532 case SLSB_P_INPUT_ERROR
:
533 process_buffer_error(q
, start
, count
);
534 if (atomic_sub_return(count
, &q
->nr_buf_used
) == 0)
535 qperf_inc(q
, inbound_queue_full
);
536 if (q
->irq_ptr
->perf_stat_enabled
)
537 account_sbals_error(q
, count
);
539 case SLSB_CU_INPUT_EMPTY
:
540 case SLSB_P_INPUT_NOT_INIT
:
541 case SLSB_P_INPUT_ACK
:
542 if (q
->irq_ptr
->perf_stat_enabled
)
543 q
->q_stats
.nr_sbal_nop
++;
544 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "in nop:%1d %#02x",
553 static int qdio_inbound_q_moved(struct qdio_q
*q
, unsigned int start
)
557 count
= get_inbound_buffer_frontier(q
, start
);
559 if (count
&& !is_thinint_irq(q
->irq_ptr
) && MACHINE_IS_LPAR
)
560 q
->u
.in
.timestamp
= get_tod_clock();
565 static inline int qdio_inbound_q_done(struct qdio_q
*q
, unsigned int start
)
567 unsigned char state
= 0;
569 if (!atomic_read(&q
->nr_buf_used
))
572 if (need_siga_sync(q
))
574 get_buf_state(q
, start
, &state
, 0);
576 if (state
== SLSB_P_INPUT_PRIMED
|| state
== SLSB_P_INPUT_ERROR
)
577 /* more work coming */
580 if (is_thinint_irq(q
->irq_ptr
))
583 /* don't poll under z/VM */
588 * At this point we know, that inbound first_to_check
589 * has (probably) not moved (see qdio_inbound_processing).
591 if (get_tod_clock_fast() > q
->u
.in
.timestamp
+ QDIO_INPUT_THRESHOLD
) {
592 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "in done:%02x", start
);
598 static inline void qdio_handle_aobs(struct qdio_q
*q
, int start
, int count
)
600 unsigned char state
= 0;
603 for (j
= 0; j
< count
; ++j
) {
604 get_buf_state(q
, b
, &state
, 0);
605 if (state
== SLSB_P_OUTPUT_PENDING
) {
606 struct qaob
*aob
= q
->u
.out
.aobs
[b
];
610 q
->u
.out
.sbal_state
[b
].flags
|=
611 QDIO_OUTBUF_STATE_FLAG_PENDING
;
612 q
->u
.out
.aobs
[b
] = NULL
;
618 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q
*q
,
621 unsigned long phys_aob
= 0;
623 if (!q
->aobs
[bufnr
]) {
624 struct qaob
*aob
= qdio_allocate_aob();
625 q
->aobs
[bufnr
] = aob
;
627 if (q
->aobs
[bufnr
]) {
628 q
->aobs
[bufnr
]->user1
= (u64
) q
->sbal_state
[bufnr
].user
;
629 phys_aob
= virt_to_phys(q
->aobs
[bufnr
]);
630 WARN_ON_ONCE(phys_aob
& 0xFF);
633 q
->sbal_state
[bufnr
].flags
= 0;
637 static void qdio_kick_handler(struct qdio_q
*q
, unsigned int count
)
639 int start
= q
->first_to_kick
;
641 if (unlikely(q
->irq_ptr
->state
!= QDIO_IRQ_STATE_ACTIVE
))
645 qperf_inc(q
, inbound_handler
);
646 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "kih s:%02x c:%02x", start
, count
);
648 qperf_inc(q
, outbound_handler
);
649 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "koh: s:%02x c:%02x",
653 q
->handler(q
->irq_ptr
->cdev
, q
->qdio_error
, q
->nr
, start
, count
,
654 q
->irq_ptr
->int_parm
);
656 /* for the next time */
657 q
->first_to_kick
= add_buf(start
, count
);
661 static inline int qdio_tasklet_schedule(struct qdio_q
*q
)
663 if (likely(q
->irq_ptr
->state
== QDIO_IRQ_STATE_ACTIVE
)) {
664 tasklet_schedule(&q
->tasklet
);
670 static void __qdio_inbound_processing(struct qdio_q
*q
)
672 unsigned int start
= q
->first_to_check
;
675 qperf_inc(q
, tasklet_inbound
);
677 count
= qdio_inbound_q_moved(q
, start
);
681 start
= add_buf(start
, count
);
682 q
->first_to_check
= start
;
683 qdio_kick_handler(q
, count
);
685 if (!qdio_inbound_q_done(q
, start
)) {
686 /* means poll time is not yet over */
687 qperf_inc(q
, tasklet_inbound_resched
);
688 if (!qdio_tasklet_schedule(q
))
692 qdio_stop_polling(q
);
694 * We need to check again to not lose initiative after
695 * resetting the ACK state.
697 if (!qdio_inbound_q_done(q
, start
)) {
698 qperf_inc(q
, tasklet_inbound_resched2
);
699 qdio_tasklet_schedule(q
);
703 void qdio_inbound_processing(unsigned long data
)
705 struct qdio_q
*q
= (struct qdio_q
*)data
;
706 __qdio_inbound_processing(q
);
709 static int get_outbound_buffer_frontier(struct qdio_q
*q
, unsigned int start
)
711 unsigned char state
= 0;
714 q
->timestamp
= get_tod_clock_fast();
716 if (need_siga_sync(q
))
717 if (((queue_type(q
) != QDIO_IQDIO_QFMT
) &&
718 !pci_out_supported(q
->irq_ptr
)) ||
719 (queue_type(q
) == QDIO_IQDIO_QFMT
&&
720 multicast_outbound(q
)))
723 count
= atomic_read(&q
->nr_buf_used
);
727 count
= get_buf_states(q
, start
, &state
, count
, 0, q
->u
.out
.use_cq
);
732 case SLSB_P_OUTPUT_EMPTY
:
733 case SLSB_P_OUTPUT_PENDING
:
734 /* the adapter got it */
735 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
,
736 "out empty:%1d %02x", q
->nr
, count
);
738 atomic_sub(count
, &q
->nr_buf_used
);
739 if (q
->irq_ptr
->perf_stat_enabled
)
740 account_sbals(q
, count
);
742 case SLSB_P_OUTPUT_ERROR
:
743 process_buffer_error(q
, start
, count
);
744 atomic_sub(count
, &q
->nr_buf_used
);
745 if (q
->irq_ptr
->perf_stat_enabled
)
746 account_sbals_error(q
, count
);
748 case SLSB_CU_OUTPUT_PRIMED
:
749 /* the adapter has not fetched the output yet */
750 if (q
->irq_ptr
->perf_stat_enabled
)
751 q
->q_stats
.nr_sbal_nop
++;
752 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "out primed:%1d",
755 case SLSB_P_OUTPUT_NOT_INIT
:
756 case SLSB_P_OUTPUT_HALTED
:
764 /* all buffers processed? */
765 static inline int qdio_outbound_q_done(struct qdio_q
*q
)
767 return atomic_read(&q
->nr_buf_used
) == 0;
770 static inline int qdio_outbound_q_moved(struct qdio_q
*q
, unsigned int start
)
774 count
= get_outbound_buffer_frontier(q
, start
);
777 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "out moved:%1d", q
->nr
);
779 qdio_handle_aobs(q
, start
, count
);
785 static int qdio_kick_outbound_q(struct qdio_q
*q
, unsigned int count
,
789 unsigned int busy_bit
;
791 if (!need_siga_out(q
))
794 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "siga-w:%1d", q
->nr
);
796 qperf_inc(q
, siga_write
);
798 cc
= qdio_siga_output(q
, count
, &busy_bit
, aob
);
804 while (++retries
< QDIO_BUSY_BIT_RETRIES
) {
805 mdelay(QDIO_BUSY_BIT_RETRY_DELAY
);
808 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q
), q
->nr
);
811 DBF_DEV_EVENT(DBF_INFO
, q
->irq_ptr
, "siga-w cc2:%1d", q
->nr
);
817 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q
), cc
);
822 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q
), q
->nr
);
823 DBF_ERROR("count:%u", retries
);
828 static void __qdio_outbound_processing(struct qdio_q
*q
)
830 unsigned int start
= q
->first_to_check
;
833 qperf_inc(q
, tasklet_outbound
);
834 WARN_ON_ONCE(atomic_read(&q
->nr_buf_used
) < 0);
836 count
= qdio_outbound_q_moved(q
, start
);
838 q
->first_to_check
= add_buf(start
, count
);
839 qdio_kick_handler(q
, count
);
842 if (queue_type(q
) == QDIO_ZFCP_QFMT
&& !pci_out_supported(q
->irq_ptr
) &&
843 !qdio_outbound_q_done(q
))
846 if (q
->u
.out
.pci_out_enabled
)
850 * Now we know that queue type is either qeth without pci enabled
851 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
852 * is noticed and outbound_handler is called after some time.
854 if (qdio_outbound_q_done(q
))
855 del_timer_sync(&q
->u
.out
.timer
);
857 if (!timer_pending(&q
->u
.out
.timer
) &&
858 likely(q
->irq_ptr
->state
== QDIO_IRQ_STATE_ACTIVE
))
859 mod_timer(&q
->u
.out
.timer
, jiffies
+ 10 * HZ
);
863 qdio_tasklet_schedule(q
);
866 /* outbound tasklet */
867 void qdio_outbound_processing(unsigned long data
)
869 struct qdio_q
*q
= (struct qdio_q
*)data
;
870 __qdio_outbound_processing(q
);
873 void qdio_outbound_timer(struct timer_list
*t
)
875 struct qdio_q
*q
= from_timer(q
, t
, u
.out
.timer
);
877 qdio_tasklet_schedule(q
);
880 static inline void qdio_check_outbound_pci_queues(struct qdio_irq
*irq
)
885 if (!pci_out_supported(irq
) || !irq
->scan_threshold
)
888 for_each_output_queue(irq
, out
, i
)
889 if (!qdio_outbound_q_done(out
))
890 qdio_tasklet_schedule(out
);
893 static void __tiqdio_inbound_processing(struct qdio_q
*q
)
895 unsigned int start
= q
->first_to_check
;
898 qperf_inc(q
, tasklet_inbound
);
899 if (need_siga_sync(q
) && need_siga_sync_after_ai(q
))
902 /* The interrupt could be caused by a PCI request: */
903 qdio_check_outbound_pci_queues(q
->irq_ptr
);
905 count
= qdio_inbound_q_moved(q
, start
);
909 start
= add_buf(start
, count
);
910 q
->first_to_check
= start
;
911 qdio_kick_handler(q
, count
);
913 if (!qdio_inbound_q_done(q
, start
)) {
914 qperf_inc(q
, tasklet_inbound_resched
);
915 if (!qdio_tasklet_schedule(q
))
919 qdio_stop_polling(q
);
921 * We need to check again to not lose initiative after
922 * resetting the ACK state.
924 if (!qdio_inbound_q_done(q
, start
)) {
925 qperf_inc(q
, tasklet_inbound_resched2
);
926 qdio_tasklet_schedule(q
);
930 void tiqdio_inbound_processing(unsigned long data
)
932 struct qdio_q
*q
= (struct qdio_q
*)data
;
933 __tiqdio_inbound_processing(q
);
936 static inline void qdio_set_state(struct qdio_irq
*irq_ptr
,
937 enum qdio_irq_states state
)
939 DBF_DEV_EVENT(DBF_INFO
, irq_ptr
, "newstate: %1d", state
);
941 irq_ptr
->state
= state
;
945 static void qdio_irq_check_sense(struct qdio_irq
*irq_ptr
, struct irb
*irb
)
947 if (irb
->esw
.esw0
.erw
.cons
) {
948 DBF_ERROR("%4x sense:", irq_ptr
->schid
.sch_no
);
949 DBF_ERROR_HEX(irb
, 64);
950 DBF_ERROR_HEX(irb
->ecw
, 64);
954 /* PCI interrupt handler */
955 static void qdio_int_handler_pci(struct qdio_irq
*irq_ptr
)
960 if (unlikely(irq_ptr
->state
!= QDIO_IRQ_STATE_ACTIVE
))
963 for_each_input_queue(irq_ptr
, q
, i
) {
964 if (q
->u
.in
.queue_start_poll
) {
965 /* skip if polling is enabled or already in work */
966 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED
,
967 &q
->u
.in
.queue_irq_state
)) {
968 qperf_inc(q
, int_discarded
);
971 q
->u
.in
.queue_start_poll(q
->irq_ptr
->cdev
, q
->nr
,
972 q
->irq_ptr
->int_parm
);
974 tasklet_schedule(&q
->tasklet
);
978 if (!pci_out_supported(irq_ptr
) || !irq_ptr
->scan_threshold
)
981 for_each_output_queue(irq_ptr
, q
, i
) {
982 if (qdio_outbound_q_done(q
))
984 if (need_siga_sync(q
) && need_siga_sync_out_after_pci(q
))
986 qdio_tasklet_schedule(q
);
990 static void qdio_handle_activate_check(struct ccw_device
*cdev
,
991 unsigned long intparm
, int cstat
, int dstat
)
993 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
997 DBF_ERROR("%4x ACT CHECK", irq_ptr
->schid
.sch_no
);
998 DBF_ERROR("intp :%lx", intparm
);
999 DBF_ERROR("ds: %2x cs:%2x", dstat
, cstat
);
1001 if (irq_ptr
->nr_input_qs
) {
1002 q
= irq_ptr
->input_qs
[0];
1003 } else if (irq_ptr
->nr_output_qs
) {
1004 q
= irq_ptr
->output_qs
[0];
1010 count
= sub_buf(q
->first_to_check
, q
->first_to_kick
);
1011 q
->handler(q
->irq_ptr
->cdev
, QDIO_ERROR_ACTIVATE
,
1012 q
->nr
, q
->first_to_kick
, count
, irq_ptr
->int_parm
);
1014 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_STOPPED
);
1016 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1017 * Therefore we call the LGR detection function here.
1022 static void qdio_establish_handle_irq(struct ccw_device
*cdev
, int cstat
,
1025 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1027 DBF_DEV_EVENT(DBF_INFO
, irq_ptr
, "qest irq");
1031 if (dstat
& ~(DEV_STAT_DEV_END
| DEV_STAT_CHN_END
))
1033 if (!(dstat
& DEV_STAT_DEV_END
))
1035 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_ESTABLISHED
);
1039 DBF_ERROR("%4x EQ:error", irq_ptr
->schid
.sch_no
);
1040 DBF_ERROR("ds: %2x cs:%2x", dstat
, cstat
);
1041 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_ERR
);
1044 /* qdio interrupt handler */
1045 void qdio_int_handler(struct ccw_device
*cdev
, unsigned long intparm
,
1048 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1049 struct subchannel_id schid
;
1052 if (!intparm
|| !irq_ptr
) {
1053 ccw_device_get_schid(cdev
, &schid
);
1054 DBF_ERROR("qint:%4x", schid
.sch_no
);
1058 if (irq_ptr
->perf_stat_enabled
)
1059 irq_ptr
->perf_stat
.qdio_int
++;
1062 DBF_ERROR("%4x IO error", irq_ptr
->schid
.sch_no
);
1063 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_ERR
);
1064 wake_up(&cdev
->private->wait_q
);
1067 qdio_irq_check_sense(irq_ptr
, irb
);
1068 cstat
= irb
->scsw
.cmd
.cstat
;
1069 dstat
= irb
->scsw
.cmd
.dstat
;
1071 switch (irq_ptr
->state
) {
1072 case QDIO_IRQ_STATE_INACTIVE
:
1073 qdio_establish_handle_irq(cdev
, cstat
, dstat
);
1075 case QDIO_IRQ_STATE_CLEANUP
:
1076 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_INACTIVE
);
1078 case QDIO_IRQ_STATE_ESTABLISHED
:
1079 case QDIO_IRQ_STATE_ACTIVE
:
1080 if (cstat
& SCHN_STAT_PCI
) {
1081 qdio_int_handler_pci(irq_ptr
);
1085 qdio_handle_activate_check(cdev
, intparm
, cstat
,
1088 case QDIO_IRQ_STATE_STOPPED
:
1093 wake_up(&cdev
->private->wait_q
);
1097 * qdio_get_ssqd_desc - get qdio subchannel description
1098 * @cdev: ccw device to get description for
1099 * @data: where to store the ssqd
1101 * Returns 0 or an error code. The results of the chsc are stored in the
1102 * specified structure.
1104 int qdio_get_ssqd_desc(struct ccw_device
*cdev
,
1105 struct qdio_ssqd_desc
*data
)
1107 struct subchannel_id schid
;
1109 if (!cdev
|| !cdev
->private)
1112 ccw_device_get_schid(cdev
, &schid
);
1113 DBF_EVENT("get ssqd:%4x", schid
.sch_no
);
1114 return qdio_setup_get_ssqd(NULL
, &schid
, data
);
1116 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc
);
1118 static void qdio_shutdown_queues(struct ccw_device
*cdev
)
1120 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1124 for_each_input_queue(irq_ptr
, q
, i
)
1125 tasklet_kill(&q
->tasklet
);
1127 for_each_output_queue(irq_ptr
, q
, i
) {
1128 del_timer_sync(&q
->u
.out
.timer
);
1129 tasklet_kill(&q
->tasklet
);
1134 * qdio_shutdown - shut down a qdio subchannel
1135 * @cdev: associated ccw device
1136 * @how: use halt or clear to shutdown
1138 int qdio_shutdown(struct ccw_device
*cdev
, int how
)
1140 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1141 struct subchannel_id schid
;
1147 WARN_ON_ONCE(irqs_disabled());
1148 ccw_device_get_schid(cdev
, &schid
);
1149 DBF_EVENT("qshutdown:%4x", schid
.sch_no
);
1151 mutex_lock(&irq_ptr
->setup_mutex
);
1153 * Subchannel was already shot down. We cannot prevent being called
1154 * twice since cio may trigger a shutdown asynchronously.
1156 if (irq_ptr
->state
== QDIO_IRQ_STATE_INACTIVE
) {
1157 mutex_unlock(&irq_ptr
->setup_mutex
);
1162 * Indicate that the device is going down. Scheduling the queue
1163 * tasklets is forbidden from here on.
1165 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_STOPPED
);
1167 tiqdio_remove_input_queues(irq_ptr
);
1168 qdio_shutdown_queues(cdev
);
1169 qdio_shutdown_debug_entries(irq_ptr
);
1171 /* cleanup subchannel */
1172 spin_lock_irq(get_ccwdev_lock(cdev
));
1174 if (how
& QDIO_FLAG_CLEANUP_USING_CLEAR
)
1175 rc
= ccw_device_clear(cdev
, QDIO_DOING_CLEANUP
);
1177 /* default behaviour is halt */
1178 rc
= ccw_device_halt(cdev
, QDIO_DOING_CLEANUP
);
1180 DBF_ERROR("%4x SHUTD ERR", irq_ptr
->schid
.sch_no
);
1181 DBF_ERROR("rc:%4d", rc
);
1185 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_CLEANUP
);
1186 spin_unlock_irq(get_ccwdev_lock(cdev
));
1187 wait_event_interruptible_timeout(cdev
->private->wait_q
,
1188 irq_ptr
->state
== QDIO_IRQ_STATE_INACTIVE
||
1189 irq_ptr
->state
== QDIO_IRQ_STATE_ERR
,
1191 spin_lock_irq(get_ccwdev_lock(cdev
));
1194 qdio_shutdown_thinint(irq_ptr
);
1196 /* restore interrupt handler */
1197 if ((void *)cdev
->handler
== (void *)qdio_int_handler
) {
1198 cdev
->handler
= irq_ptr
->orig_handler
;
1199 cdev
->private->intparm
= 0;
1201 spin_unlock_irq(get_ccwdev_lock(cdev
));
1203 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_INACTIVE
);
1204 mutex_unlock(&irq_ptr
->setup_mutex
);
1209 EXPORT_SYMBOL_GPL(qdio_shutdown
);
1212 * qdio_free - free data structures for a qdio subchannel
1213 * @cdev: associated ccw device
1215 int qdio_free(struct ccw_device
*cdev
)
1217 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1218 struct subchannel_id schid
;
1223 ccw_device_get_schid(cdev
, &schid
);
1224 DBF_EVENT("qfree:%4x", schid
.sch_no
);
1225 DBF_DEV_EVENT(DBF_ERR
, irq_ptr
, "dbf abandoned");
1226 mutex_lock(&irq_ptr
->setup_mutex
);
1228 irq_ptr
->debug_area
= NULL
;
1229 cdev
->private->qdio_data
= NULL
;
1230 mutex_unlock(&irq_ptr
->setup_mutex
);
1232 qdio_release_memory(irq_ptr
);
1235 EXPORT_SYMBOL_GPL(qdio_free
);
1238 * qdio_allocate - allocate qdio queues and associated data
1239 * @init_data: initialization data
1241 int qdio_allocate(struct qdio_initialize
*init_data
)
1243 struct subchannel_id schid
;
1244 struct qdio_irq
*irq_ptr
;
1246 ccw_device_get_schid(init_data
->cdev
, &schid
);
1247 DBF_EVENT("qallocate:%4x", schid
.sch_no
);
1249 if ((init_data
->no_input_qs
&& !init_data
->input_handler
) ||
1250 (init_data
->no_output_qs
&& !init_data
->output_handler
))
1253 if ((init_data
->no_input_qs
> QDIO_MAX_QUEUES_PER_IRQ
) ||
1254 (init_data
->no_output_qs
> QDIO_MAX_QUEUES_PER_IRQ
))
1257 if ((!init_data
->input_sbal_addr_array
) ||
1258 (!init_data
->output_sbal_addr_array
))
1261 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1262 irq_ptr
= (void *) get_zeroed_page(GFP_KERNEL
| GFP_DMA
);
1266 mutex_init(&irq_ptr
->setup_mutex
);
1267 if (qdio_allocate_dbf(init_data
, irq_ptr
))
1271 * Allocate a page for the chsc calls in qdio_establish.
1272 * Must be pre-allocated since a zfcp recovery will call
1273 * qdio_establish. In case of low memory and swap on a zfcp disk
1274 * we may not be able to allocate memory otherwise.
1276 irq_ptr
->chsc_page
= get_zeroed_page(GFP_KERNEL
);
1277 if (!irq_ptr
->chsc_page
)
1280 /* qdr is used in ccw1.cda which is u32 */
1281 irq_ptr
->qdr
= (struct qdr
*) get_zeroed_page(GFP_KERNEL
| GFP_DMA
);
1285 if (qdio_allocate_qs(irq_ptr
, init_data
->no_input_qs
,
1286 init_data
->no_output_qs
))
1289 init_data
->cdev
->private->qdio_data
= irq_ptr
;
1290 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_INACTIVE
);
1293 qdio_release_memory(irq_ptr
);
1297 EXPORT_SYMBOL_GPL(qdio_allocate
);
1299 static void qdio_detect_hsicq(struct qdio_irq
*irq_ptr
)
1301 struct qdio_q
*q
= irq_ptr
->input_qs
[0];
1304 if (irq_ptr
->nr_input_qs
> 1 && queue_type(q
) == QDIO_IQDIO_QFMT
)
1307 for_each_output_queue(irq_ptr
, q
, i
) {
1309 if (multicast_outbound(q
))
1311 if (qdio_enable_async_operation(&q
->u
.out
) < 0) {
1316 qdio_disable_async_operation(&q
->u
.out
);
1318 DBF_EVENT("use_cq:%d", use_cq
);
1322 * qdio_establish - establish queues on a qdio subchannel
1323 * @init_data: initialization data
1325 int qdio_establish(struct qdio_initialize
*init_data
)
1327 struct ccw_device
*cdev
= init_data
->cdev
;
1328 struct subchannel_id schid
;
1329 struct qdio_irq
*irq_ptr
;
1332 ccw_device_get_schid(cdev
, &schid
);
1333 DBF_EVENT("qestablish:%4x", schid
.sch_no
);
1335 irq_ptr
= cdev
->private->qdio_data
;
1339 mutex_lock(&irq_ptr
->setup_mutex
);
1340 qdio_setup_irq(init_data
);
1342 rc
= qdio_establish_thinint(irq_ptr
);
1344 mutex_unlock(&irq_ptr
->setup_mutex
);
1345 qdio_shutdown(cdev
, QDIO_FLAG_CLEANUP_USING_CLEAR
);
1350 irq_ptr
->ccw
.cmd_code
= irq_ptr
->equeue
.cmd
;
1351 irq_ptr
->ccw
.flags
= CCW_FLAG_SLI
;
1352 irq_ptr
->ccw
.count
= irq_ptr
->equeue
.count
;
1353 irq_ptr
->ccw
.cda
= (u32
)((addr_t
)irq_ptr
->qdr
);
1355 spin_lock_irq(get_ccwdev_lock(cdev
));
1356 ccw_device_set_options_mask(cdev
, 0);
1358 rc
= ccw_device_start(cdev
, &irq_ptr
->ccw
, QDIO_DOING_ESTABLISH
, 0, 0);
1359 spin_unlock_irq(get_ccwdev_lock(cdev
));
1361 DBF_ERROR("%4x est IO ERR", irq_ptr
->schid
.sch_no
);
1362 DBF_ERROR("rc:%4x", rc
);
1363 mutex_unlock(&irq_ptr
->setup_mutex
);
1364 qdio_shutdown(cdev
, QDIO_FLAG_CLEANUP_USING_CLEAR
);
1368 wait_event_interruptible_timeout(cdev
->private->wait_q
,
1369 irq_ptr
->state
== QDIO_IRQ_STATE_ESTABLISHED
||
1370 irq_ptr
->state
== QDIO_IRQ_STATE_ERR
, HZ
);
1372 if (irq_ptr
->state
!= QDIO_IRQ_STATE_ESTABLISHED
) {
1373 mutex_unlock(&irq_ptr
->setup_mutex
);
1374 qdio_shutdown(cdev
, QDIO_FLAG_CLEANUP_USING_CLEAR
);
1378 qdio_setup_ssqd_info(irq_ptr
);
1380 qdio_detect_hsicq(irq_ptr
);
1382 /* qebsm is now setup if available, initialize buffer states */
1383 qdio_init_buf_states(irq_ptr
);
1385 mutex_unlock(&irq_ptr
->setup_mutex
);
1386 qdio_print_subchannel_info(irq_ptr
, cdev
);
1387 qdio_setup_debug_entries(irq_ptr
, cdev
);
1390 EXPORT_SYMBOL_GPL(qdio_establish
);
1393 * qdio_activate - activate queues on a qdio subchannel
1394 * @cdev: associated cdev
1396 int qdio_activate(struct ccw_device
*cdev
)
1398 struct subchannel_id schid
;
1399 struct qdio_irq
*irq_ptr
;
1402 ccw_device_get_schid(cdev
, &schid
);
1403 DBF_EVENT("qactivate:%4x", schid
.sch_no
);
1405 irq_ptr
= cdev
->private->qdio_data
;
1409 mutex_lock(&irq_ptr
->setup_mutex
);
1410 if (irq_ptr
->state
== QDIO_IRQ_STATE_INACTIVE
) {
1415 irq_ptr
->ccw
.cmd_code
= irq_ptr
->aqueue
.cmd
;
1416 irq_ptr
->ccw
.flags
= CCW_FLAG_SLI
;
1417 irq_ptr
->ccw
.count
= irq_ptr
->aqueue
.count
;
1418 irq_ptr
->ccw
.cda
= 0;
1420 spin_lock_irq(get_ccwdev_lock(cdev
));
1421 ccw_device_set_options(cdev
, CCWDEV_REPORT_ALL
);
1423 rc
= ccw_device_start(cdev
, &irq_ptr
->ccw
, QDIO_DOING_ACTIVATE
,
1424 0, DOIO_DENY_PREFETCH
);
1425 spin_unlock_irq(get_ccwdev_lock(cdev
));
1427 DBF_ERROR("%4x act IO ERR", irq_ptr
->schid
.sch_no
);
1428 DBF_ERROR("rc:%4x", rc
);
1432 if (is_thinint_irq(irq_ptr
))
1433 tiqdio_add_input_queues(irq_ptr
);
1435 /* wait for subchannel to become active */
1438 switch (irq_ptr
->state
) {
1439 case QDIO_IRQ_STATE_STOPPED
:
1440 case QDIO_IRQ_STATE_ERR
:
1444 qdio_set_state(irq_ptr
, QDIO_IRQ_STATE_ACTIVE
);
1448 mutex_unlock(&irq_ptr
->setup_mutex
);
1451 EXPORT_SYMBOL_GPL(qdio_activate
);
1453 static inline int buf_in_between(int bufnr
, int start
, int count
)
1455 int end
= add_buf(start
, count
);
1458 if (bufnr
>= start
&& bufnr
< end
)
1464 /* wrap-around case */
1465 if ((bufnr
>= start
&& bufnr
<= QDIO_MAX_BUFFERS_PER_Q
) ||
1473 * handle_inbound - reset processed input buffers
1474 * @q: queue containing the buffers
1476 * @bufnr: first buffer to process
1477 * @count: how many buffers are emptied
1479 static int handle_inbound(struct qdio_q
*q
, unsigned int callflags
,
1480 int bufnr
, int count
)
1484 qperf_inc(q
, inbound_call
);
1486 if (!q
->u
.in
.polling
)
1489 /* protect against stop polling setting an ACK for an emptied slsb */
1490 if (count
== QDIO_MAX_BUFFERS_PER_Q
) {
1491 /* overwriting everything, just delete polling status */
1492 q
->u
.in
.polling
= 0;
1493 q
->u
.in
.ack_count
= 0;
1495 } else if (buf_in_between(q
->u
.in
.ack_start
, bufnr
, count
)) {
1497 /* partial overwrite, just update ack_start */
1498 diff
= add_buf(bufnr
, count
);
1499 diff
= sub_buf(diff
, q
->u
.in
.ack_start
);
1500 q
->u
.in
.ack_count
-= diff
;
1501 if (q
->u
.in
.ack_count
<= 0) {
1502 q
->u
.in
.polling
= 0;
1503 q
->u
.in
.ack_count
= 0;
1506 q
->u
.in
.ack_start
= add_buf(q
->u
.in
.ack_start
, diff
);
1509 /* the only ACK will be deleted, so stop polling */
1510 q
->u
.in
.polling
= 0;
1514 count
= set_buf_states(q
, bufnr
, SLSB_CU_INPUT_EMPTY
, count
);
1515 atomic_add(count
, &q
->nr_buf_used
);
1517 if (need_siga_in(q
))
1518 return qdio_siga_input(q
);
1524 * handle_outbound - process filled outbound buffers
1525 * @q: queue containing the buffers
1527 * @bufnr: first buffer to process
1528 * @count: how many buffers are filled
1530 static int handle_outbound(struct qdio_q
*q
, unsigned int callflags
,
1531 unsigned int bufnr
, unsigned int count
)
1533 const unsigned int scan_threshold
= q
->irq_ptr
->scan_threshold
;
1534 unsigned char state
= 0;
1537 qperf_inc(q
, outbound_call
);
1539 count
= set_buf_states(q
, bufnr
, SLSB_CU_OUTPUT_PRIMED
, count
);
1540 used
= atomic_add_return(count
, &q
->nr_buf_used
);
1542 if (used
== QDIO_MAX_BUFFERS_PER_Q
)
1543 qperf_inc(q
, outbound_queue_full
);
1545 if (callflags
& QDIO_FLAG_PCI_OUT
) {
1546 q
->u
.out
.pci_out_enabled
= 1;
1547 qperf_inc(q
, pci_request_int
);
1549 q
->u
.out
.pci_out_enabled
= 0;
1551 if (queue_type(q
) == QDIO_IQDIO_QFMT
) {
1552 unsigned long phys_aob
= 0;
1554 if (q
->u
.out
.use_cq
&& count
== 1)
1555 phys_aob
= qdio_aob_for_buffer(&q
->u
.out
, bufnr
);
1557 rc
= qdio_kick_outbound_q(q
, count
, phys_aob
);
1558 } else if (need_siga_sync(q
)) {
1559 rc
= qdio_siga_sync_q(q
);
1560 } else if (count
< QDIO_MAX_BUFFERS_PER_Q
&&
1561 get_buf_state(q
, prev_buf(bufnr
), &state
, 0) > 0 &&
1562 state
== SLSB_CU_OUTPUT_PRIMED
) {
1563 /* The previous buffer is not processed yet, tack on. */
1564 qperf_inc(q
, fast_requeue
);
1566 rc
= qdio_kick_outbound_q(q
, count
, 0);
1569 /* Let drivers implement their own completion scanning: */
1570 if (!scan_threshold
)
1573 /* in case of SIGA errors we must process the error immediately */
1574 if (used
>= scan_threshold
|| rc
)
1575 qdio_tasklet_schedule(q
);
1577 /* free the SBALs in case of no further traffic */
1578 if (!timer_pending(&q
->u
.out
.timer
) &&
1579 likely(q
->irq_ptr
->state
== QDIO_IRQ_STATE_ACTIVE
))
1580 mod_timer(&q
->u
.out
.timer
, jiffies
+ HZ
);
1585 * do_QDIO - process input or output buffers
1586 * @cdev: associated ccw_device for the qdio subchannel
1587 * @callflags: input or output and special flags from the program
1588 * @q_nr: queue number
1589 * @bufnr: buffer number
1590 * @count: how many buffers to process
1592 int do_QDIO(struct ccw_device
*cdev
, unsigned int callflags
,
1593 int q_nr
, unsigned int bufnr
, unsigned int count
)
1595 struct qdio_irq
*irq_ptr
;
1597 if (bufnr
>= QDIO_MAX_BUFFERS_PER_Q
|| count
> QDIO_MAX_BUFFERS_PER_Q
)
1600 irq_ptr
= cdev
->private->qdio_data
;
1604 DBF_DEV_EVENT(DBF_INFO
, irq_ptr
,
1605 "do%02x b:%02x c:%02x", callflags
, bufnr
, count
);
1607 if (irq_ptr
->state
!= QDIO_IRQ_STATE_ACTIVE
)
1611 if (callflags
& QDIO_FLAG_SYNC_INPUT
)
1612 return handle_inbound(irq_ptr
->input_qs
[q_nr
],
1613 callflags
, bufnr
, count
);
1614 else if (callflags
& QDIO_FLAG_SYNC_OUTPUT
)
1615 return handle_outbound(irq_ptr
->output_qs
[q_nr
],
1616 callflags
, bufnr
, count
);
1619 EXPORT_SYMBOL_GPL(do_QDIO
);
1622 * qdio_start_irq - process input buffers
1623 * @cdev: associated ccw_device for the qdio subchannel
1624 * @nr: input queue number
1628 * 1 - irqs not started since new data is available
1630 int qdio_start_irq(struct ccw_device
*cdev
, int nr
)
1633 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1637 q
= irq_ptr
->input_qs
[nr
];
1639 clear_nonshared_ind(irq_ptr
);
1640 qdio_stop_polling(q
);
1641 clear_bit(QDIO_QUEUE_IRQS_DISABLED
, &q
->u
.in
.queue_irq_state
);
1644 * We need to check again to not lose initiative after
1645 * resetting the ACK state.
1647 if (test_nonshared_ind(irq_ptr
))
1649 if (!qdio_inbound_q_done(q
, q
->first_to_check
))
1654 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED
,
1655 &q
->u
.in
.queue_irq_state
))
1661 EXPORT_SYMBOL(qdio_start_irq
);
1663 static int __qdio_inspect_queue(struct qdio_q
*q
, unsigned int *bufnr
,
1664 unsigned int *error
)
1666 unsigned int start
= q
->first_to_check
;
1669 count
= q
->is_input_q
? qdio_inbound_q_moved(q
, start
) :
1670 qdio_outbound_q_moved(q
, start
);
1675 *error
= q
->qdio_error
;
1677 /* for the next time */
1678 q
->first_to_check
= add_buf(start
, count
);
1684 int qdio_inspect_queue(struct ccw_device
*cdev
, unsigned int nr
, bool is_input
,
1685 unsigned int *bufnr
, unsigned int *error
)
1687 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1692 q
= is_input
? irq_ptr
->input_qs
[nr
] : irq_ptr
->output_qs
[nr
];
1694 if (need_siga_sync(q
))
1695 qdio_siga_sync_q(q
);
1697 return __qdio_inspect_queue(q
, bufnr
, error
);
1699 EXPORT_SYMBOL_GPL(qdio_inspect_queue
);
1702 * qdio_get_next_buffers - process input buffers
1703 * @cdev: associated ccw_device for the qdio subchannel
1704 * @nr: input queue number
1705 * @bufnr: first filled buffer number
1706 * @error: buffers are in error state
1710 * = 0 - no new buffers found
1711 * > 0 - number of processed buffers
1713 int qdio_get_next_buffers(struct ccw_device
*cdev
, int nr
, int *bufnr
,
1717 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1721 q
= irq_ptr
->input_qs
[nr
];
1724 * Cannot rely on automatic sync after interrupt since queues may
1725 * also be examined without interrupt.
1727 if (need_siga_sync(q
))
1728 qdio_sync_queues(q
);
1730 qdio_check_outbound_pci_queues(irq_ptr
);
1732 /* Note: upper-layer MUST stop processing immediately here ... */
1733 if (unlikely(q
->irq_ptr
->state
!= QDIO_IRQ_STATE_ACTIVE
))
1736 return __qdio_inspect_queue(q
, bufnr
, error
);
1738 EXPORT_SYMBOL(qdio_get_next_buffers
);
1741 * qdio_stop_irq - disable interrupt processing for the device
1742 * @cdev: associated ccw_device for the qdio subchannel
1743 * @nr: input queue number
1746 * 0 - interrupts were already disabled
1747 * 1 - interrupts successfully disabled
1749 int qdio_stop_irq(struct ccw_device
*cdev
, int nr
)
1752 struct qdio_irq
*irq_ptr
= cdev
->private->qdio_data
;
1756 q
= irq_ptr
->input_qs
[nr
];
1758 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED
,
1759 &q
->u
.in
.queue_irq_state
))
1764 EXPORT_SYMBOL(qdio_stop_irq
);
1767 * qdio_pnso_brinfo() - perform network subchannel op #0 - bridge info.
1768 * @schid: Subchannel ID.
1769 * @cnc: Boolean Change-Notification Control
1770 * @response: Response code will be stored at this address
1771 * @cb: Callback function will be executed for each element
1772 * of the address list
1773 * @priv: Pointer to pass to the callback function.
1775 * Performs "Store-network-bridging-information list" operation and calls
1776 * the callback function for every entry in the list. If "change-
1777 * notification-control" is set, further changes in the address list
1778 * will be reported via the IPA command.
1780 int qdio_pnso_brinfo(struct subchannel_id schid
,
1781 int cnc
, u16
*response
,
1782 void (*cb
)(void *priv
, enum qdio_brinfo_entry_type type
,
1786 struct chsc_pnso_area
*rr
;
1788 u32 prev_instance
= 0;
1789 int isfirstblock
= 1;
1792 rr
= (struct chsc_pnso_area
*)get_zeroed_page(GFP_KERNEL
);
1796 /* on the first iteration, naihdr.resume_token will be zero */
1797 rc
= chsc_pnso_brinfo(schid
, rr
, rr
->naihdr
.resume_token
, cnc
);
1798 if (rc
!= 0 && rc
!= -EBUSY
)
1800 if (rr
->response
.code
!= 1) {
1809 size
= rr
->naihdr
.naids
;
1810 elems
= (rr
->response
.length
-
1811 sizeof(struct chsc_header
) -
1812 sizeof(struct chsc_brinfo_naihdr
)) /
1815 if (!isfirstblock
&& (rr
->naihdr
.instance
!= prev_instance
)) {
1816 /* Inform the caller that they need to scrap */
1817 /* the data that was already reported via cb */
1822 prev_instance
= rr
->naihdr
.instance
;
1823 for (i
= 0; i
< elems
; i
++)
1825 case sizeof(struct qdio_brinfo_entry_l3_ipv6
):
1826 (*cb
)(priv
, l3_ipv6_addr
,
1827 &rr
->entries
.l3_ipv6
[i
]);
1829 case sizeof(struct qdio_brinfo_entry_l3_ipv4
):
1830 (*cb
)(priv
, l3_ipv4_addr
,
1831 &rr
->entries
.l3_ipv4
[i
]);
1833 case sizeof(struct qdio_brinfo_entry_l2
):
1834 (*cb
)(priv
, l2_addr_lnid
,
1835 &rr
->entries
.l2
[i
]);
1842 } while (rr
->response
.code
== 0x0107 || /* channel busy */
1843 (rr
->response
.code
== 1 && /* list stored */
1844 /* resume token is non-zero => list incomplete */
1845 (rr
->naihdr
.resume_token
.t1
|| rr
->naihdr
.resume_token
.t2
)));
1846 (*response
) = rr
->response
.code
;
1849 free_page((unsigned long)rr
);
1852 EXPORT_SYMBOL_GPL(qdio_pnso_brinfo
);
1854 static int __init
init_QDIO(void)
1858 rc
= qdio_debug_init();
1861 rc
= qdio_setup_init();
1864 rc
= tiqdio_allocate_memory();
1867 rc
= tiqdio_register_thinints();
1873 tiqdio_free_memory();
1881 static void __exit
exit_QDIO(void)
1883 tiqdio_unregister_thinints();
1884 tiqdio_free_memory();
1889 module_init(init_QDIO
);
1890 module_exit(exit_QDIO
);