2 * linux/drivers/s390/cio/qdio_main.c
4 * Linux for s390 qdio support, buffer handling, qdio API and module support.
6 * Copyright 2000,2008 IBM Corp.
7 * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
8 * Jan Glauber <jang@linux.vnet.ibm.com>
9 * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/timer.h>
15 #include <linux/delay.h>
16 #include <linux/gfp.h>
18 #include <linux/kernel_stat.h>
19 #include <linux/atomic.h>
20 #include <asm/debug.h>
27 #include "qdio_debug.h"
29 MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
30 "Jan Glauber <jang@linux.vnet.ibm.com>");
31 MODULE_DESCRIPTION("QDIO base support");
32 MODULE_LICENSE("GPL");
34 static inline int do_siga_sync(unsigned long schid,
35 unsigned int out_mask, unsigned int in_mask,
38 register unsigned long __fc asm ("0") = fc;
39 register unsigned long __schid asm ("1") = schid;
40 register unsigned long out asm ("2") = out_mask;
41 register unsigned long in asm ("3") = in_mask;
49 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
53 static inline int do_siga_input(unsigned long schid, unsigned int mask,
56 register unsigned long __fc asm ("0") = fc;
57 register unsigned long __schid asm ("1") = schid;
58 register unsigned long __mask asm ("2") = mask;
66 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
71 * do_siga_output - perform SIGA-w/wt function
72 * @schid: subchannel id or in case of QEBSM the subchannel token
73 * @mask: which output queues to process
74 * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
75 * @fc: function code to perform
77 * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
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;
88 int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
96 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask),
99 *bb = ((unsigned int) __fc) >> 31;
103 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
105 /* all done or next buffer state different */
106 if (ccq == 0 || ccq == 32)
108 /* not all buffers processed */
109 if (ccq == 96 || ccq == 97)
111 /* notify devices immediately */
112 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
117 * qdio_do_eqbs - extract buffer states for QEBSM
118 * @q: queue to manipulate
119 * @state: state of the extracted buffers
120 * @start: buffer number to start at
121 * @count: count of buffers to examine
122 * @auto_ack: automatically acknowledge buffers
124 * Returns the number of successfully extracted equal buffer states.
125 * Stops processing if a state is different from the last buffers state.
127 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
128 int start, int count, int auto_ack)
130 unsigned int ccq = 0;
131 int tmp_count = count, tmp_start = start;
135 BUG_ON(!q->irq_ptr->sch_token);
139 nr += q->irq_ptr->nr_input_qs;
141 ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
143 rc = qdio_check_ccq(q, ccq);
145 /* At least one buffer was processed, return and extract the remaining
148 if ((ccq == 96) && (count != tmp_count)) {
149 qperf_inc(q, eqbs_partial);
150 return (count - tmp_count);
154 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
159 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
160 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
161 q->handler(q->irq_ptr->cdev,
162 QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
163 q->nr, q->first_to_kick, count,
164 q->irq_ptr->int_parm);
167 return count - tmp_count;
171 * qdio_do_sqbs - set buffer states for QEBSM
172 * @q: queue to manipulate
173 * @state: new state of the buffers
174 * @start: first buffer number to change
175 * @count: how many buffers to change
177 * Returns the number of successfully changed buffers.
178 * Does retrying until the specified count of buffer states is set or an
181 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
184 unsigned int ccq = 0;
185 int tmp_count = count, tmp_start = start;
192 BUG_ON(!q->irq_ptr->sch_token);
196 nr += q->irq_ptr->nr_input_qs;
198 ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
199 rc = qdio_check_ccq(q, ccq);
201 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
202 qperf_inc(q, sqbs_partial);
206 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
207 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
208 q->handler(q->irq_ptr->cdev,
209 QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
210 q->nr, q->first_to_kick, count,
211 q->irq_ptr->int_parm);
215 return count - tmp_count;
218 /* returns number of examined buffers and their common state in *state */
219 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
220 unsigned char *state, unsigned int count,
221 int auto_ack, int merge_pending)
223 unsigned char __state = 0;
226 BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
227 BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
230 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
232 for (i = 0; i < count; i++) {
234 __state = q->slsb.val[bufnr];
235 if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
236 __state = SLSB_P_OUTPUT_EMPTY;
237 } else if (merge_pending) {
238 if ((q->slsb.val[bufnr] & __state) != __state)
240 } else if (q->slsb.val[bufnr] != __state)
242 bufnr = next_buf(bufnr);
248 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
249 unsigned char *state, int auto_ack)
251 return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
254 /* wrap-around safe setting of slsb states, returns number of changed buffers */
255 static inline int set_buf_states(struct qdio_q *q, int bufnr,
256 unsigned char state, int count)
260 BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
261 BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
264 return qdio_do_sqbs(q, state, bufnr, count);
266 for (i = 0; i < count; i++) {
267 xchg(&q->slsb.val[bufnr], state);
268 bufnr = next_buf(bufnr);
273 static inline int set_buf_state(struct qdio_q *q, int bufnr,
276 return set_buf_states(q, bufnr, state, 1);
279 /* set slsb states to initial state */
280 void qdio_init_buf_states(struct qdio_irq *irq_ptr)
285 for_each_input_queue(irq_ptr, q, i)
286 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
287 QDIO_MAX_BUFFERS_PER_Q);
288 for_each_output_queue(irq_ptr, q, i)
289 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
290 QDIO_MAX_BUFFERS_PER_Q);
293 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
296 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
297 unsigned int fc = QDIO_SIGA_SYNC;
300 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
301 qperf_inc(q, siga_sync);
304 schid = q->irq_ptr->sch_token;
305 fc |= QDIO_SIGA_QEBSM_FLAG;
308 cc = do_siga_sync(schid, output, input, fc);
310 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
314 static inline int qdio_siga_sync_q(struct qdio_q *q)
317 return qdio_siga_sync(q, 0, q->mask);
319 return qdio_siga_sync(q, q->mask, 0);
322 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
325 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
326 unsigned int fc = QDIO_SIGA_WRITE;
329 unsigned long laob = 0;
331 if (q->u.out.use_cq && aob != 0) {
332 fc = QDIO_SIGA_WRITEQ;
337 schid = q->irq_ptr->sch_token;
338 fc |= QDIO_SIGA_QEBSM_FLAG;
341 WARN_ON_ONCE((aob && queue_type(q) != QDIO_IQDIO_QFMT) ||
342 (aob && fc != QDIO_SIGA_WRITEQ));
343 cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
345 /* hipersocket busy condition */
346 if (unlikely(*busy_bit)) {
347 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
351 start_time = get_clock();
354 if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE)
358 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
359 "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
360 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
365 static inline int qdio_siga_input(struct qdio_q *q)
367 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
368 unsigned int fc = QDIO_SIGA_READ;
371 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
372 qperf_inc(q, siga_read);
375 schid = q->irq_ptr->sch_token;
376 fc |= QDIO_SIGA_QEBSM_FLAG;
379 cc = do_siga_input(schid, q->mask, fc);
381 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
385 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
386 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
388 static inline void qdio_sync_queues(struct qdio_q *q)
390 /* PCI capable outbound queues will also be scanned so sync them too */
391 if (pci_out_supported(q))
392 qdio_siga_sync_all(q);
397 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
398 unsigned char *state)
400 if (need_siga_sync(q))
402 return get_buf_states(q, bufnr, state, 1, 0, 0);
405 static inline void qdio_stop_polling(struct qdio_q *q)
407 if (!q->u.in.polling)
411 qperf_inc(q, stop_polling);
413 /* show the card that we are not polling anymore */
415 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
417 q->u.in.ack_count = 0;
419 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
422 static inline void account_sbals(struct qdio_q *q, int count)
426 q->q_stats.nr_sbal_total += count;
427 if (count == QDIO_MAX_BUFFERS_MASK) {
428 q->q_stats.nr_sbals[7]++;
433 q->q_stats.nr_sbals[pos]++;
436 static void process_buffer_error(struct qdio_q *q, int count)
438 unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
439 SLSB_P_OUTPUT_NOT_INIT;
441 q->qdio_error |= QDIO_ERROR_SLSB_STATE;
443 /* special handling for no target buffer empty */
444 if ((!q->is_input_q &&
445 (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
446 qperf_inc(q, target_full);
447 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
452 DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
453 DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
454 DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
455 DBF_ERROR("F14:%2x F15:%2x",
456 q->sbal[q->first_to_check]->element[14].sflags,
457 q->sbal[q->first_to_check]->element[15].sflags);
460 * Interrupts may be avoided as long as the error is present
461 * so change the buffer state immediately to avoid starvation.
463 set_buf_states(q, q->first_to_check, state, count);
466 static inline void inbound_primed(struct qdio_q *q, int count)
470 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
472 /* for QEBSM the ACK was already set by EQBS */
474 if (!q->u.in.polling) {
476 q->u.in.ack_count = count;
477 q->u.in.ack_start = q->first_to_check;
481 /* delete the previous ACK's */
482 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
484 q->u.in.ack_count = count;
485 q->u.in.ack_start = q->first_to_check;
490 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
491 * or by the next inbound run.
493 new = add_buf(q->first_to_check, count - 1);
494 if (q->u.in.polling) {
495 /* reset the previous ACK but first set the new one */
496 set_buf_state(q, new, SLSB_P_INPUT_ACK);
497 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
500 set_buf_state(q, new, SLSB_P_INPUT_ACK);
503 q->u.in.ack_start = new;
507 /* need to change ALL buffers to get more interrupts */
508 set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
511 static int get_inbound_buffer_frontier(struct qdio_q *q)
514 unsigned char state = 0;
517 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
520 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
521 stop = add_buf(q->first_to_check, count);
523 if (q->first_to_check == stop)
527 * No siga sync here, as a PCI or we after a thin interrupt
528 * already sync'ed the queues.
530 count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
535 case SLSB_P_INPUT_PRIMED:
536 inbound_primed(q, count);
537 q->first_to_check = add_buf(q->first_to_check, count);
538 if (atomic_sub(count, &q->nr_buf_used) == 0)
539 qperf_inc(q, inbound_queue_full);
540 if (q->irq_ptr->perf_stat_enabled)
541 account_sbals(q, count);
543 case SLSB_P_INPUT_ERROR:
544 process_buffer_error(q, count);
545 q->first_to_check = add_buf(q->first_to_check, count);
546 atomic_sub(count, &q->nr_buf_used);
547 if (q->irq_ptr->perf_stat_enabled)
548 account_sbals_error(q, count);
550 case SLSB_CU_INPUT_EMPTY:
551 case SLSB_P_INPUT_NOT_INIT:
552 case SLSB_P_INPUT_ACK:
553 if (q->irq_ptr->perf_stat_enabled)
554 q->q_stats.nr_sbal_nop++;
555 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
561 return q->first_to_check;
564 static int qdio_inbound_q_moved(struct qdio_q *q)
568 bufnr = get_inbound_buffer_frontier(q);
570 if ((bufnr != q->last_move) || q->qdio_error) {
571 q->last_move = bufnr;
572 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
573 q->u.in.timestamp = get_clock();
579 static inline int qdio_inbound_q_done(struct qdio_q *q)
581 unsigned char state = 0;
583 if (!atomic_read(&q->nr_buf_used))
586 if (need_siga_sync(q))
588 get_buf_state(q, q->first_to_check, &state, 0);
590 if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
591 /* more work coming */
594 if (is_thinint_irq(q->irq_ptr))
597 /* don't poll under z/VM */
602 * At this point we know, that inbound first_to_check
603 * has (probably) not moved (see qdio_inbound_processing).
605 if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
606 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
613 static inline int contains_aobs(struct qdio_q *q)
615 return !q->is_input_q && q->u.out.use_cq;
618 static inline void qdio_trace_aob(struct qdio_irq *irq, struct qdio_q *q,
619 int i, struct qaob *aob)
623 DBF_DEV_EVENT(DBF_INFO, irq, "AOB%d:%lx", i,
624 (unsigned long) virt_to_phys(aob));
625 DBF_DEV_EVENT(DBF_INFO, irq, "RES00:%lx",
626 (unsigned long) aob->res0[0]);
627 DBF_DEV_EVENT(DBF_INFO, irq, "RES01:%lx",
628 (unsigned long) aob->res0[1]);
629 DBF_DEV_EVENT(DBF_INFO, irq, "RES02:%lx",
630 (unsigned long) aob->res0[2]);
631 DBF_DEV_EVENT(DBF_INFO, irq, "RES03:%lx",
632 (unsigned long) aob->res0[3]);
633 DBF_DEV_EVENT(DBF_INFO, irq, "RES04:%lx",
634 (unsigned long) aob->res0[4]);
635 DBF_DEV_EVENT(DBF_INFO, irq, "RES05:%lx",
636 (unsigned long) aob->res0[5]);
637 DBF_DEV_EVENT(DBF_INFO, irq, "RES1:%x", aob->res1);
638 DBF_DEV_EVENT(DBF_INFO, irq, "RES2:%x", aob->res2);
639 DBF_DEV_EVENT(DBF_INFO, irq, "RES3:%x", aob->res3);
640 DBF_DEV_EVENT(DBF_INFO, irq, "AORC:%u", aob->aorc);
641 DBF_DEV_EVENT(DBF_INFO, irq, "FLAGS:%u", aob->flags);
642 DBF_DEV_EVENT(DBF_INFO, irq, "CBTBS:%u", aob->cbtbs);
643 DBF_DEV_EVENT(DBF_INFO, irq, "SBC:%u", aob->sb_count);
644 for (tmp = 0; tmp < QDIO_MAX_ELEMENTS_PER_BUFFER; ++tmp) {
645 DBF_DEV_EVENT(DBF_INFO, irq, "SBA%d:%lx", tmp,
646 (unsigned long) aob->sba[tmp]);
647 DBF_DEV_EVENT(DBF_INFO, irq, "rSBA%d:%lx", tmp,
648 (unsigned long) q->sbal[i]->element[tmp].addr);
649 DBF_DEV_EVENT(DBF_INFO, irq, "DC%d:%u", tmp, aob->dcount[tmp]);
650 DBF_DEV_EVENT(DBF_INFO, irq, "rDC%d:%u", tmp,
651 q->sbal[i]->element[tmp].length);
653 DBF_DEV_EVENT(DBF_INFO, irq, "USER0:%lx", (unsigned long) aob->user0);
654 for (tmp = 0; tmp < 2; ++tmp) {
655 DBF_DEV_EVENT(DBF_INFO, irq, "RES4%d:%lx", tmp,
656 (unsigned long) aob->res4[tmp]);
658 DBF_DEV_EVENT(DBF_INFO, irq, "USER1:%lx", (unsigned long) aob->user1);
659 DBF_DEV_EVENT(DBF_INFO, irq, "USER2:%lx", (unsigned long) aob->user2);
662 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
664 unsigned char state = 0;
667 if (!contains_aobs(q))
670 for (j = 0; j < count; ++j) {
671 get_buf_state(q, b, &state, 0);
672 if (state == SLSB_P_OUTPUT_PENDING) {
673 struct qaob *aob = q->u.out.aobs[b];
677 BUG_ON(q->u.out.sbal_state == NULL);
678 q->u.out.sbal_state[b].flags |=
679 QDIO_OUTBUF_STATE_FLAG_PENDING;
680 q->u.out.aobs[b] = NULL;
681 } else if (state == SLSB_P_OUTPUT_EMPTY) {
682 BUG_ON(q->u.out.sbal_state == NULL);
683 q->u.out.sbal_state[b].aob = NULL;
689 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
692 unsigned long phys_aob = 0;
697 if (!q->aobs[bufnr]) {
698 struct qaob *aob = qdio_allocate_aob();
699 q->aobs[bufnr] = aob;
701 if (q->aobs[bufnr]) {
702 BUG_ON(q->sbal_state == NULL);
703 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
704 q->sbal_state[bufnr].aob = q->aobs[bufnr];
705 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
706 phys_aob = virt_to_phys(q->aobs[bufnr]);
707 BUG_ON(phys_aob & 0xFF);
714 static void qdio_kick_handler(struct qdio_q *q)
716 int start = q->first_to_kick;
717 int end = q->first_to_check;
720 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
723 count = sub_buf(end, start);
726 qperf_inc(q, inbound_handler);
727 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
729 qperf_inc(q, outbound_handler);
730 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
734 qdio_handle_aobs(q, start, count);
736 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
737 q->irq_ptr->int_parm);
739 /* for the next time */
740 q->first_to_kick = end;
744 static void __qdio_inbound_processing(struct qdio_q *q)
746 qperf_inc(q, tasklet_inbound);
748 if (!qdio_inbound_q_moved(q))
751 qdio_kick_handler(q);
753 if (!qdio_inbound_q_done(q)) {
754 /* means poll time is not yet over */
755 qperf_inc(q, tasklet_inbound_resched);
756 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
757 tasklet_schedule(&q->tasklet);
762 qdio_stop_polling(q);
764 * We need to check again to not lose initiative after
765 * resetting the ACK state.
767 if (!qdio_inbound_q_done(q)) {
768 qperf_inc(q, tasklet_inbound_resched2);
769 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
770 tasklet_schedule(&q->tasklet);
774 void qdio_inbound_processing(unsigned long data)
776 struct qdio_q *q = (struct qdio_q *)data;
777 __qdio_inbound_processing(q);
780 static int get_outbound_buffer_frontier(struct qdio_q *q)
783 unsigned char state = 0;
785 if (need_siga_sync(q))
786 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
787 !pci_out_supported(q)) ||
788 (queue_type(q) == QDIO_IQDIO_QFMT &&
789 multicast_outbound(q)))
793 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
796 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
797 stop = add_buf(q->first_to_check, count);
798 if (q->first_to_check == stop)
801 count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
806 case SLSB_P_OUTPUT_PENDING:
808 case SLSB_P_OUTPUT_EMPTY:
809 /* the adapter got it */
810 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
811 "out empty:%1d %02x", q->nr, count);
813 atomic_sub(count, &q->nr_buf_used);
814 q->first_to_check = add_buf(q->first_to_check, count);
815 if (q->irq_ptr->perf_stat_enabled)
816 account_sbals(q, count);
819 case SLSB_P_OUTPUT_ERROR:
820 process_buffer_error(q, count);
821 q->first_to_check = add_buf(q->first_to_check, count);
822 atomic_sub(count, &q->nr_buf_used);
823 if (q->irq_ptr->perf_stat_enabled)
824 account_sbals_error(q, count);
826 case SLSB_CU_OUTPUT_PRIMED:
827 /* the adapter has not fetched the output yet */
828 if (q->irq_ptr->perf_stat_enabled)
829 q->q_stats.nr_sbal_nop++;
830 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
833 case SLSB_P_OUTPUT_NOT_INIT:
834 case SLSB_P_OUTPUT_HALTED:
841 return q->first_to_check;
844 /* all buffers processed? */
845 static inline int qdio_outbound_q_done(struct qdio_q *q)
847 return atomic_read(&q->nr_buf_used) == 0;
850 static inline int qdio_outbound_q_moved(struct qdio_q *q)
854 bufnr = get_outbound_buffer_frontier(q);
856 if ((bufnr != q->last_move) || q->qdio_error) {
857 q->last_move = bufnr;
858 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
864 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
867 unsigned int busy_bit;
869 if (!need_siga_out(q))
872 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
874 qperf_inc(q, siga_write);
876 cc = qdio_siga_output(q, &busy_bit, aob);
882 while (++retries < QDIO_BUSY_BIT_RETRIES) {
883 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
886 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
887 cc |= QDIO_ERROR_SIGA_BUSY;
889 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
893 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
897 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
898 DBF_ERROR("count:%u", retries);
903 static void __qdio_outbound_processing(struct qdio_q *q)
905 qperf_inc(q, tasklet_outbound);
906 BUG_ON(atomic_read(&q->nr_buf_used) < 0);
908 if (qdio_outbound_q_moved(q))
909 qdio_kick_handler(q);
911 if (queue_type(q) == QDIO_ZFCP_QFMT)
912 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
915 /* bail out for HiperSockets unicast queues */
916 if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
919 if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
920 (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
923 if (q->u.out.pci_out_enabled)
927 * Now we know that queue type is either qeth without pci enabled
928 * or HiperSockets multicast. Make sure buffer switch from PRIMED to
929 * EMPTY is noticed and outbound_handler is called after some time.
931 if (qdio_outbound_q_done(q))
932 del_timer(&q->u.out.timer);
934 if (!timer_pending(&q->u.out.timer))
935 mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
939 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
941 tasklet_schedule(&q->tasklet);
944 /* outbound tasklet */
945 void qdio_outbound_processing(unsigned long data)
947 struct qdio_q *q = (struct qdio_q *)data;
948 __qdio_outbound_processing(q);
951 void qdio_outbound_timer(unsigned long data)
953 struct qdio_q *q = (struct qdio_q *)data;
955 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
957 tasklet_schedule(&q->tasklet);
960 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
965 if (!pci_out_supported(q))
968 for_each_output_queue(q->irq_ptr, out, i)
969 if (!qdio_outbound_q_done(out))
970 tasklet_schedule(&out->tasklet);
973 static void __tiqdio_inbound_processing(struct qdio_q *q)
975 qperf_inc(q, tasklet_inbound);
976 if (need_siga_sync(q) && need_siga_sync_after_ai(q))
980 * The interrupt could be caused by a PCI request. Check the
981 * PCI capable outbound queues.
983 qdio_check_outbound_after_thinint(q);
985 if (!qdio_inbound_q_moved(q))
988 qdio_kick_handler(q);
990 if (!qdio_inbound_q_done(q)) {
991 qperf_inc(q, tasklet_inbound_resched);
992 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
993 tasklet_schedule(&q->tasklet);
998 qdio_stop_polling(q);
1000 * We need to check again to not lose initiative after
1001 * resetting the ACK state.
1003 if (!qdio_inbound_q_done(q)) {
1004 qperf_inc(q, tasklet_inbound_resched2);
1005 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
1006 tasklet_schedule(&q->tasklet);
1010 void tiqdio_inbound_processing(unsigned long data)
1012 struct qdio_q *q = (struct qdio_q *)data;
1013 __tiqdio_inbound_processing(q);
1016 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
1017 enum qdio_irq_states state)
1019 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
1021 irq_ptr->state = state;
1025 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
1027 if (irb->esw.esw0.erw.cons) {
1028 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
1029 DBF_ERROR_HEX(irb, 64);
1030 DBF_ERROR_HEX(irb->ecw, 64);
1034 /* PCI interrupt handler */
1035 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
1040 if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
1043 for_each_input_queue(irq_ptr, q, i) {
1044 if (q->u.in.queue_start_poll) {
1045 /* skip if polling is enabled or already in work */
1046 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1047 &q->u.in.queue_irq_state)) {
1048 qperf_inc(q, int_discarded);
1051 q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
1052 q->irq_ptr->int_parm);
1054 tasklet_schedule(&q->tasklet);
1058 if (!pci_out_supported(q))
1061 for_each_output_queue(irq_ptr, q, i) {
1062 if (qdio_outbound_q_done(q))
1064 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1065 qdio_siga_sync_q(q);
1066 tasklet_schedule(&q->tasklet);
1070 static void qdio_handle_activate_check(struct ccw_device *cdev,
1071 unsigned long intparm, int cstat, int dstat)
1073 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1077 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1078 DBF_ERROR("intp :%lx", intparm);
1079 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1081 if (irq_ptr->nr_input_qs) {
1082 q = irq_ptr->input_qs[0];
1083 } else if (irq_ptr->nr_output_qs) {
1084 q = irq_ptr->output_qs[0];
1090 count = sub_buf(q->first_to_check, q->first_to_kick);
1091 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
1092 q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1094 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1097 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1100 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1102 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1106 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1108 if (!(dstat & DEV_STAT_DEV_END))
1110 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1114 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1115 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1116 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1119 /* qdio interrupt handler */
1120 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1123 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1126 if (!intparm || !irq_ptr) {
1127 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
1131 kstat_cpu(smp_processor_id()).irqs[IOINT_QDI]++;
1132 if (irq_ptr->perf_stat_enabled)
1133 irq_ptr->perf_stat.qdio_int++;
1136 switch (PTR_ERR(irb)) {
1138 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1139 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1140 wake_up(&cdev->private->wait_q);
1147 qdio_irq_check_sense(irq_ptr, irb);
1148 cstat = irb->scsw.cmd.cstat;
1149 dstat = irb->scsw.cmd.dstat;
1151 switch (irq_ptr->state) {
1152 case QDIO_IRQ_STATE_INACTIVE:
1153 qdio_establish_handle_irq(cdev, cstat, dstat);
1155 case QDIO_IRQ_STATE_CLEANUP:
1156 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1158 case QDIO_IRQ_STATE_ESTABLISHED:
1159 case QDIO_IRQ_STATE_ACTIVE:
1160 if (cstat & SCHN_STAT_PCI) {
1161 qdio_int_handler_pci(irq_ptr);
1165 qdio_handle_activate_check(cdev, intparm, cstat,
1168 case QDIO_IRQ_STATE_STOPPED:
1173 wake_up(&cdev->private->wait_q);
1177 * qdio_get_ssqd_desc - get qdio subchannel description
1178 * @cdev: ccw device to get description for
1179 * @data: where to store the ssqd
1181 * Returns 0 or an error code. The results of the chsc are stored in the
1182 * specified structure.
1184 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1185 struct qdio_ssqd_desc *data)
1188 if (!cdev || !cdev->private)
1191 DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1192 return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1194 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1196 static void qdio_shutdown_queues(struct ccw_device *cdev)
1198 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1202 for_each_input_queue(irq_ptr, q, i)
1203 tasklet_kill(&q->tasklet);
1205 for_each_output_queue(irq_ptr, q, i) {
1206 del_timer(&q->u.out.timer);
1207 tasklet_kill(&q->tasklet);
1212 * qdio_shutdown - shut down a qdio subchannel
1213 * @cdev: associated ccw device
1214 * @how: use halt or clear to shutdown
1216 int qdio_shutdown(struct ccw_device *cdev, int how)
1218 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1220 unsigned long flags;
1225 BUG_ON(irqs_disabled());
1226 DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1228 mutex_lock(&irq_ptr->setup_mutex);
1230 * Subchannel was already shot down. We cannot prevent being called
1231 * twice since cio may trigger a shutdown asynchronously.
1233 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1234 mutex_unlock(&irq_ptr->setup_mutex);
1239 * Indicate that the device is going down. Scheduling the queue
1240 * tasklets is forbidden from here on.
1242 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1244 tiqdio_remove_input_queues(irq_ptr);
1245 qdio_shutdown_queues(cdev);
1246 qdio_shutdown_debug_entries(irq_ptr, cdev);
1248 /* cleanup subchannel */
1249 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1251 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1252 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1254 /* default behaviour is halt */
1255 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1257 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1258 DBF_ERROR("rc:%4d", rc);
1262 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1263 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1264 wait_event_interruptible_timeout(cdev->private->wait_q,
1265 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1266 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1268 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1271 qdio_shutdown_thinint(irq_ptr);
1273 /* restore interrupt handler */
1274 if ((void *)cdev->handler == (void *)qdio_int_handler)
1275 cdev->handler = irq_ptr->orig_handler;
1276 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1278 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1279 mutex_unlock(&irq_ptr->setup_mutex);
1284 EXPORT_SYMBOL_GPL(qdio_shutdown);
1287 * qdio_free - free data structures for a qdio subchannel
1288 * @cdev: associated ccw device
1290 int qdio_free(struct ccw_device *cdev)
1292 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1297 DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1298 mutex_lock(&irq_ptr->setup_mutex);
1300 if (irq_ptr->debug_area != NULL) {
1301 debug_unregister(irq_ptr->debug_area);
1302 irq_ptr->debug_area = NULL;
1304 cdev->private->qdio_data = NULL;
1305 mutex_unlock(&irq_ptr->setup_mutex);
1307 qdio_release_memory(irq_ptr);
1310 EXPORT_SYMBOL_GPL(qdio_free);
1313 * qdio_allocate - allocate qdio queues and associated data
1314 * @init_data: initialization data
1316 int qdio_allocate(struct qdio_initialize *init_data)
1318 struct qdio_irq *irq_ptr;
1320 DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1322 if ((init_data->no_input_qs && !init_data->input_handler) ||
1323 (init_data->no_output_qs && !init_data->output_handler))
1326 if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1327 (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1330 if ((!init_data->input_sbal_addr_array) ||
1331 (!init_data->output_sbal_addr_array))
1334 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1335 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1339 mutex_init(&irq_ptr->setup_mutex);
1340 qdio_allocate_dbf(init_data, irq_ptr);
1343 * Allocate a page for the chsc calls in qdio_establish.
1344 * Must be pre-allocated since a zfcp recovery will call
1345 * qdio_establish. In case of low memory and swap on a zfcp disk
1346 * we may not be able to allocate memory otherwise.
1348 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1349 if (!irq_ptr->chsc_page)
1352 /* qdr is used in ccw1.cda which is u32 */
1353 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1356 WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1358 if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1359 init_data->no_output_qs))
1362 init_data->cdev->private->qdio_data = irq_ptr;
1363 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1366 qdio_release_memory(irq_ptr);
1370 EXPORT_SYMBOL_GPL(qdio_allocate);
1372 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1374 struct qdio_q *q = irq_ptr->input_qs[0];
1377 if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1380 for_each_output_queue(irq_ptr, q, i) {
1382 if (qdio_enable_async_operation(&q->u.out) < 0) {
1387 qdio_disable_async_operation(&q->u.out);
1389 DBF_EVENT("use_cq:%d", use_cq);
1393 * qdio_establish - establish queues on a qdio subchannel
1394 * @init_data: initialization data
1396 int qdio_establish(struct qdio_initialize *init_data)
1398 struct qdio_irq *irq_ptr;
1399 struct ccw_device *cdev = init_data->cdev;
1400 unsigned long saveflags;
1403 DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1405 irq_ptr = cdev->private->qdio_data;
1409 if (cdev->private->state != DEV_STATE_ONLINE)
1412 mutex_lock(&irq_ptr->setup_mutex);
1413 qdio_setup_irq(init_data);
1415 rc = qdio_establish_thinint(irq_ptr);
1417 mutex_unlock(&irq_ptr->setup_mutex);
1418 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1423 irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1424 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1425 irq_ptr->ccw.count = irq_ptr->equeue.count;
1426 irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1428 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1429 ccw_device_set_options_mask(cdev, 0);
1431 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1433 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1434 DBF_ERROR("rc:%4x", rc);
1436 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1439 mutex_unlock(&irq_ptr->setup_mutex);
1440 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1444 wait_event_interruptible_timeout(cdev->private->wait_q,
1445 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1446 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1448 if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1449 mutex_unlock(&irq_ptr->setup_mutex);
1450 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1454 qdio_setup_ssqd_info(irq_ptr);
1455 DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1457 qdio_detect_hsicq(irq_ptr);
1459 /* qebsm is now setup if available, initialize buffer states */
1460 qdio_init_buf_states(irq_ptr);
1462 mutex_unlock(&irq_ptr->setup_mutex);
1463 qdio_print_subchannel_info(irq_ptr, cdev);
1464 qdio_setup_debug_entries(irq_ptr, cdev);
1467 EXPORT_SYMBOL_GPL(qdio_establish);
1470 * qdio_activate - activate queues on a qdio subchannel
1471 * @cdev: associated cdev
1473 int qdio_activate(struct ccw_device *cdev)
1475 struct qdio_irq *irq_ptr;
1477 unsigned long saveflags;
1479 DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1481 irq_ptr = cdev->private->qdio_data;
1485 if (cdev->private->state != DEV_STATE_ONLINE)
1488 mutex_lock(&irq_ptr->setup_mutex);
1489 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1494 irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1495 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1496 irq_ptr->ccw.count = irq_ptr->aqueue.count;
1497 irq_ptr->ccw.cda = 0;
1499 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1500 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1502 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1503 0, DOIO_DENY_PREFETCH);
1505 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1506 DBF_ERROR("rc:%4x", rc);
1508 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1513 if (is_thinint_irq(irq_ptr))
1514 tiqdio_add_input_queues(irq_ptr);
1516 /* wait for subchannel to become active */
1519 switch (irq_ptr->state) {
1520 case QDIO_IRQ_STATE_STOPPED:
1521 case QDIO_IRQ_STATE_ERR:
1525 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1529 mutex_unlock(&irq_ptr->setup_mutex);
1532 EXPORT_SYMBOL_GPL(qdio_activate);
1534 static inline int buf_in_between(int bufnr, int start, int count)
1536 int end = add_buf(start, count);
1539 if (bufnr >= start && bufnr < end)
1545 /* wrap-around case */
1546 if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1554 * handle_inbound - reset processed input buffers
1555 * @q: queue containing the buffers
1557 * @bufnr: first buffer to process
1558 * @count: how many buffers are emptied
1560 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1561 int bufnr, int count)
1565 qperf_inc(q, inbound_call);
1567 if (!q->u.in.polling)
1570 /* protect against stop polling setting an ACK for an emptied slsb */
1571 if (count == QDIO_MAX_BUFFERS_PER_Q) {
1572 /* overwriting everything, just delete polling status */
1573 q->u.in.polling = 0;
1574 q->u.in.ack_count = 0;
1576 } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1578 /* partial overwrite, just update ack_start */
1579 diff = add_buf(bufnr, count);
1580 diff = sub_buf(diff, q->u.in.ack_start);
1581 q->u.in.ack_count -= diff;
1582 if (q->u.in.ack_count <= 0) {
1583 q->u.in.polling = 0;
1584 q->u.in.ack_count = 0;
1587 q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1590 /* the only ACK will be deleted, so stop polling */
1591 q->u.in.polling = 0;
1595 count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1597 used = atomic_add_return(count, &q->nr_buf_used) - count;
1598 BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1600 if (need_siga_in(q))
1601 return qdio_siga_input(q);
1607 * handle_outbound - process filled outbound buffers
1608 * @q: queue containing the buffers
1610 * @bufnr: first buffer to process
1611 * @count: how many buffers are filled
1613 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1614 int bufnr, int count)
1616 unsigned char state = 0;
1619 qperf_inc(q, outbound_call);
1621 count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1622 used = atomic_add_return(count, &q->nr_buf_used);
1623 BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1625 if (used == QDIO_MAX_BUFFERS_PER_Q)
1626 qperf_inc(q, outbound_queue_full);
1628 if (callflags & QDIO_FLAG_PCI_OUT) {
1629 q->u.out.pci_out_enabled = 1;
1630 qperf_inc(q, pci_request_int);
1632 q->u.out.pci_out_enabled = 0;
1634 if (queue_type(q) == QDIO_IQDIO_QFMT) {
1635 unsigned long phys_aob = 0;
1637 /* One SIGA-W per buffer required for unicast HSI */
1638 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1640 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1642 rc = qdio_kick_outbound_q(q, phys_aob);
1643 } else if (need_siga_sync(q)) {
1644 rc = qdio_siga_sync_q(q);
1646 /* try to fast requeue buffers */
1647 get_buf_state(q, prev_buf(bufnr), &state, 0);
1648 if (state != SLSB_CU_OUTPUT_PRIMED)
1649 rc = qdio_kick_outbound_q(q, 0);
1651 qperf_inc(q, fast_requeue);
1654 /* in case of SIGA errors we must process the error immediately */
1655 if (used >= q->u.out.scan_threshold || rc)
1656 tasklet_schedule(&q->tasklet);
1658 /* free the SBALs in case of no further traffic */
1659 if (!timer_pending(&q->u.out.timer))
1660 mod_timer(&q->u.out.timer, jiffies + HZ);
1665 * do_QDIO - process input or output buffers
1666 * @cdev: associated ccw_device for the qdio subchannel
1667 * @callflags: input or output and special flags from the program
1668 * @q_nr: queue number
1669 * @bufnr: buffer number
1670 * @count: how many buffers to process
1672 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1673 int q_nr, unsigned int bufnr, unsigned int count)
1675 struct qdio_irq *irq_ptr;
1678 if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1681 irq_ptr = cdev->private->qdio_data;
1685 DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1686 "do%02x b:%02x c:%02x", callflags, bufnr, count);
1688 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1692 if (callflags & QDIO_FLAG_SYNC_INPUT)
1693 return handle_inbound(irq_ptr->input_qs[q_nr],
1694 callflags, bufnr, count);
1695 else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1696 return handle_outbound(irq_ptr->output_qs[q_nr],
1697 callflags, bufnr, count);
1700 EXPORT_SYMBOL_GPL(do_QDIO);
1703 * qdio_start_irq - process input buffers
1704 * @cdev: associated ccw_device for the qdio subchannel
1705 * @nr: input queue number
1709 * 1 - irqs not started since new data is available
1711 int qdio_start_irq(struct ccw_device *cdev, int nr)
1714 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1718 q = irq_ptr->input_qs[nr];
1720 WARN_ON(queue_irqs_enabled(q));
1723 xchg(q->irq_ptr->dsci, 0);
1725 qdio_stop_polling(q);
1726 clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1729 * We need to check again to not lose initiative after
1730 * resetting the ACK state.
1732 if (!shared_ind(q) && *q->irq_ptr->dsci)
1734 if (!qdio_inbound_q_done(q))
1739 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1740 &q->u.in.queue_irq_state))
1746 EXPORT_SYMBOL(qdio_start_irq);
1749 * qdio_get_next_buffers - process input buffers
1750 * @cdev: associated ccw_device for the qdio subchannel
1751 * @nr: input queue number
1752 * @bufnr: first filled buffer number
1753 * @error: buffers are in error state
1757 * = 0 - no new buffers found
1758 * > 0 - number of processed buffers
1760 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1765 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1769 q = irq_ptr->input_qs[nr];
1770 WARN_ON(queue_irqs_enabled(q));
1773 * Cannot rely on automatic sync after interrupt since queues may
1774 * also be examined without interrupt.
1776 if (need_siga_sync(q))
1777 qdio_sync_queues(q);
1779 /* check the PCI capable outbound queues. */
1780 qdio_check_outbound_after_thinint(q);
1782 if (!qdio_inbound_q_moved(q))
1785 /* Note: upper-layer MUST stop processing immediately here ... */
1786 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1789 start = q->first_to_kick;
1790 end = q->first_to_check;
1792 *error = q->qdio_error;
1794 /* for the next time */
1795 q->first_to_kick = end;
1797 return sub_buf(end, start);
1799 EXPORT_SYMBOL(qdio_get_next_buffers);
1802 * qdio_stop_irq - disable interrupt processing for the device
1803 * @cdev: associated ccw_device for the qdio subchannel
1804 * @nr: input queue number
1807 * 0 - interrupts were already disabled
1808 * 1 - interrupts successfully disabled
1810 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1813 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1817 q = irq_ptr->input_qs[nr];
1819 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1820 &q->u.in.queue_irq_state))
1825 EXPORT_SYMBOL(qdio_stop_irq);
1827 static int __init init_QDIO(void)
1831 rc = qdio_debug_init();
1834 rc = qdio_setup_init();
1837 rc = tiqdio_allocate_memory();
1840 rc = tiqdio_register_thinints();
1846 tiqdio_free_memory();
1854 static void __exit exit_QDIO(void)
1856 tiqdio_unregister_thinints();
1857 tiqdio_free_memory();
1862 module_init(init_QDIO);
1863 module_exit(exit_QDIO);