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 if (q->u.out.use_cq && aob != 0) {
323 fc = QDIO_SIGA_WRITEQ;
328 schid = q->irq_ptr->sch_token;
329 fc |= QDIO_SIGA_QEBSM_FLAG;
332 WARN_ON_ONCE((aob && queue_type(q) != QDIO_IQDIO_QFMT) ||
333 (aob && fc != QDIO_SIGA_WRITEQ));
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();
344 if ((get_tod_clock() - 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, int count)
416 q->q_stats.nr_sbal_total += count;
417 if (count == QDIO_MAX_BUFFERS_MASK) {
418 q->q_stats.nr_sbals[7]++;
423 q->q_stats.nr_sbals[pos]++;
426 static void process_buffer_error(struct qdio_q *q, int count)
428 unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
429 SLSB_P_OUTPUT_NOT_INIT;
431 q->qdio_error = QDIO_ERROR_SLSB_STATE;
433 /* special handling for no target buffer empty */
434 if ((!q->is_input_q &&
435 (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
436 qperf_inc(q, target_full);
437 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
442 DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
443 DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
444 DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
445 DBF_ERROR("F14:%2x F15:%2x",
446 q->sbal[q->first_to_check]->element[14].sflags,
447 q->sbal[q->first_to_check]->element[15].sflags);
451 * Interrupts may be avoided as long as the error is present
452 * so change the buffer state immediately to avoid starvation.
454 set_buf_states(q, q->first_to_check, state, count);
457 static inline void inbound_primed(struct qdio_q *q, int count)
461 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
463 /* for QEBSM the ACK was already set by EQBS */
465 if (!q->u.in.polling) {
467 q->u.in.ack_count = count;
468 q->u.in.ack_start = q->first_to_check;
472 /* delete the previous ACK's */
473 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
475 q->u.in.ack_count = count;
476 q->u.in.ack_start = q->first_to_check;
481 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
482 * or by the next inbound run.
484 new = add_buf(q->first_to_check, count - 1);
485 if (q->u.in.polling) {
486 /* reset the previous ACK but first set the new one */
487 set_buf_state(q, new, SLSB_P_INPUT_ACK);
488 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
491 set_buf_state(q, new, SLSB_P_INPUT_ACK);
494 q->u.in.ack_start = new;
498 /* need to change ALL buffers to get more interrupts */
499 set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
502 static int get_inbound_buffer_frontier(struct qdio_q *q)
505 unsigned char state = 0;
507 q->timestamp = get_tod_clock();
510 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
513 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
514 stop = add_buf(q->first_to_check, count);
516 if (q->first_to_check == stop)
520 * No siga sync here, as a PCI or we after a thin interrupt
521 * already sync'ed the queues.
523 count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
528 case SLSB_P_INPUT_PRIMED:
529 inbound_primed(q, count);
530 q->first_to_check = add_buf(q->first_to_check, count);
531 if (atomic_sub(count, &q->nr_buf_used) == 0)
532 qperf_inc(q, inbound_queue_full);
533 if (q->irq_ptr->perf_stat_enabled)
534 account_sbals(q, count);
536 case SLSB_P_INPUT_ERROR:
537 process_buffer_error(q, count);
538 q->first_to_check = add_buf(q->first_to_check, count);
539 atomic_sub(count, &q->nr_buf_used);
540 if (q->irq_ptr->perf_stat_enabled)
541 account_sbals_error(q, count);
543 case SLSB_CU_INPUT_EMPTY:
544 case SLSB_P_INPUT_NOT_INIT:
545 case SLSB_P_INPUT_ACK:
546 if (q->irq_ptr->perf_stat_enabled)
547 q->q_stats.nr_sbal_nop++;
548 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
554 return q->first_to_check;
557 static int qdio_inbound_q_moved(struct qdio_q *q)
561 bufnr = get_inbound_buffer_frontier(q);
563 if (bufnr != q->last_move) {
564 q->last_move = bufnr;
565 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
566 q->u.in.timestamp = get_tod_clock();
572 static inline int qdio_inbound_q_done(struct qdio_q *q)
574 unsigned char state = 0;
576 if (!atomic_read(&q->nr_buf_used))
579 if (need_siga_sync(q))
581 get_buf_state(q, q->first_to_check, &state, 0);
583 if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
584 /* more work coming */
587 if (is_thinint_irq(q->irq_ptr))
590 /* don't poll under z/VM */
595 * At this point we know, that inbound first_to_check
596 * has (probably) not moved (see qdio_inbound_processing).
598 if (get_tod_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
599 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
606 static inline int contains_aobs(struct qdio_q *q)
608 return !q->is_input_q && q->u.out.use_cq;
611 static inline void qdio_trace_aob(struct qdio_irq *irq, struct qdio_q *q,
612 int i, struct qaob *aob)
616 DBF_DEV_EVENT(DBF_INFO, irq, "AOB%d:%lx", i,
617 (unsigned long) virt_to_phys(aob));
618 DBF_DEV_EVENT(DBF_INFO, irq, "RES00:%lx",
619 (unsigned long) aob->res0[0]);
620 DBF_DEV_EVENT(DBF_INFO, irq, "RES01:%lx",
621 (unsigned long) aob->res0[1]);
622 DBF_DEV_EVENT(DBF_INFO, irq, "RES02:%lx",
623 (unsigned long) aob->res0[2]);
624 DBF_DEV_EVENT(DBF_INFO, irq, "RES03:%lx",
625 (unsigned long) aob->res0[3]);
626 DBF_DEV_EVENT(DBF_INFO, irq, "RES04:%lx",
627 (unsigned long) aob->res0[4]);
628 DBF_DEV_EVENT(DBF_INFO, irq, "RES05:%lx",
629 (unsigned long) aob->res0[5]);
630 DBF_DEV_EVENT(DBF_INFO, irq, "RES1:%x", aob->res1);
631 DBF_DEV_EVENT(DBF_INFO, irq, "RES2:%x", aob->res2);
632 DBF_DEV_EVENT(DBF_INFO, irq, "RES3:%x", aob->res3);
633 DBF_DEV_EVENT(DBF_INFO, irq, "AORC:%u", aob->aorc);
634 DBF_DEV_EVENT(DBF_INFO, irq, "FLAGS:%u", aob->flags);
635 DBF_DEV_EVENT(DBF_INFO, irq, "CBTBS:%u", aob->cbtbs);
636 DBF_DEV_EVENT(DBF_INFO, irq, "SBC:%u", aob->sb_count);
637 for (tmp = 0; tmp < QDIO_MAX_ELEMENTS_PER_BUFFER; ++tmp) {
638 DBF_DEV_EVENT(DBF_INFO, irq, "SBA%d:%lx", tmp,
639 (unsigned long) aob->sba[tmp]);
640 DBF_DEV_EVENT(DBF_INFO, irq, "rSBA%d:%lx", tmp,
641 (unsigned long) q->sbal[i]->element[tmp].addr);
642 DBF_DEV_EVENT(DBF_INFO, irq, "DC%d:%u", tmp, aob->dcount[tmp]);
643 DBF_DEV_EVENT(DBF_INFO, irq, "rDC%d:%u", tmp,
644 q->sbal[i]->element[tmp].length);
646 DBF_DEV_EVENT(DBF_INFO, irq, "USER0:%lx", (unsigned long) aob->user0);
647 for (tmp = 0; tmp < 2; ++tmp) {
648 DBF_DEV_EVENT(DBF_INFO, irq, "RES4%d:%lx", tmp,
649 (unsigned long) aob->res4[tmp]);
651 DBF_DEV_EVENT(DBF_INFO, irq, "USER1:%lx", (unsigned long) aob->user1);
652 DBF_DEV_EVENT(DBF_INFO, irq, "USER2:%lx", (unsigned long) aob->user2);
655 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
657 unsigned char state = 0;
660 if (!contains_aobs(q))
663 for (j = 0; j < count; ++j) {
664 get_buf_state(q, b, &state, 0);
665 if (state == SLSB_P_OUTPUT_PENDING) {
666 struct qaob *aob = q->u.out.aobs[b];
670 q->u.out.sbal_state[b].flags |=
671 QDIO_OUTBUF_STATE_FLAG_PENDING;
672 q->u.out.aobs[b] = NULL;
673 } else if (state == SLSB_P_OUTPUT_EMPTY) {
674 q->u.out.sbal_state[b].aob = NULL;
680 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
683 unsigned long phys_aob = 0;
688 if (!q->aobs[bufnr]) {
689 struct qaob *aob = qdio_allocate_aob();
690 q->aobs[bufnr] = aob;
692 if (q->aobs[bufnr]) {
693 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
694 q->sbal_state[bufnr].aob = q->aobs[bufnr];
695 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
696 phys_aob = virt_to_phys(q->aobs[bufnr]);
697 WARN_ON_ONCE(phys_aob & 0xFF);
704 static void qdio_kick_handler(struct qdio_q *q)
706 int start = q->first_to_kick;
707 int end = q->first_to_check;
710 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
713 count = sub_buf(end, start);
716 qperf_inc(q, inbound_handler);
717 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
719 qperf_inc(q, outbound_handler);
720 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
724 qdio_handle_aobs(q, start, count);
726 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
727 q->irq_ptr->int_parm);
729 /* for the next time */
730 q->first_to_kick = end;
734 static void __qdio_inbound_processing(struct qdio_q *q)
736 qperf_inc(q, tasklet_inbound);
738 if (!qdio_inbound_q_moved(q))
741 qdio_kick_handler(q);
743 if (!qdio_inbound_q_done(q)) {
744 /* means poll time is not yet over */
745 qperf_inc(q, tasklet_inbound_resched);
746 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
747 tasklet_schedule(&q->tasklet);
752 qdio_stop_polling(q);
754 * We need to check again to not lose initiative after
755 * resetting the ACK state.
757 if (!qdio_inbound_q_done(q)) {
758 qperf_inc(q, tasklet_inbound_resched2);
759 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
760 tasklet_schedule(&q->tasklet);
764 void qdio_inbound_processing(unsigned long data)
766 struct qdio_q *q = (struct qdio_q *)data;
767 __qdio_inbound_processing(q);
770 static int get_outbound_buffer_frontier(struct qdio_q *q)
773 unsigned char state = 0;
775 q->timestamp = get_tod_clock();
777 if (need_siga_sync(q))
778 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
779 !pci_out_supported(q)) ||
780 (queue_type(q) == QDIO_IQDIO_QFMT &&
781 multicast_outbound(q)))
785 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
788 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
789 stop = add_buf(q->first_to_check, count);
790 if (q->first_to_check == stop)
793 count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
798 case SLSB_P_OUTPUT_EMPTY:
799 /* the adapter got it */
800 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
801 "out empty:%1d %02x", q->nr, count);
803 atomic_sub(count, &q->nr_buf_used);
804 q->first_to_check = add_buf(q->first_to_check, count);
805 if (q->irq_ptr->perf_stat_enabled)
806 account_sbals(q, count);
809 case SLSB_P_OUTPUT_ERROR:
810 process_buffer_error(q, count);
811 q->first_to_check = add_buf(q->first_to_check, count);
812 atomic_sub(count, &q->nr_buf_used);
813 if (q->irq_ptr->perf_stat_enabled)
814 account_sbals_error(q, count);
816 case SLSB_CU_OUTPUT_PRIMED:
817 /* the adapter has not fetched the output yet */
818 if (q->irq_ptr->perf_stat_enabled)
819 q->q_stats.nr_sbal_nop++;
820 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
823 case SLSB_P_OUTPUT_NOT_INIT:
824 case SLSB_P_OUTPUT_HALTED:
831 return q->first_to_check;
834 /* all buffers processed? */
835 static inline int qdio_outbound_q_done(struct qdio_q *q)
837 return atomic_read(&q->nr_buf_used) == 0;
840 static inline int qdio_outbound_q_moved(struct qdio_q *q)
844 bufnr = get_outbound_buffer_frontier(q);
846 if (bufnr != q->last_move) {
847 q->last_move = bufnr;
848 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
854 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
857 unsigned int busy_bit;
859 if (!need_siga_out(q))
862 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
864 qperf_inc(q, siga_write);
866 cc = qdio_siga_output(q, &busy_bit, aob);
872 while (++retries < QDIO_BUSY_BIT_RETRIES) {
873 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
876 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
879 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
885 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
890 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
891 DBF_ERROR("count:%u", retries);
896 static void __qdio_outbound_processing(struct qdio_q *q)
898 qperf_inc(q, tasklet_outbound);
899 WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);
901 if (qdio_outbound_q_moved(q))
902 qdio_kick_handler(q);
904 if (queue_type(q) == QDIO_ZFCP_QFMT)
905 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
908 if (q->u.out.pci_out_enabled)
912 * Now we know that queue type is either qeth without pci enabled
913 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
914 * is noticed and outbound_handler is called after some time.
916 if (qdio_outbound_q_done(q))
917 del_timer(&q->u.out.timer);
919 if (!timer_pending(&q->u.out.timer))
920 mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
924 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
926 tasklet_schedule(&q->tasklet);
929 /* outbound tasklet */
930 void qdio_outbound_processing(unsigned long data)
932 struct qdio_q *q = (struct qdio_q *)data;
933 __qdio_outbound_processing(q);
936 void qdio_outbound_timer(unsigned long data)
938 struct qdio_q *q = (struct qdio_q *)data;
940 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
942 tasklet_schedule(&q->tasklet);
945 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
950 if (!pci_out_supported(q))
953 for_each_output_queue(q->irq_ptr, out, i)
954 if (!qdio_outbound_q_done(out))
955 tasklet_schedule(&out->tasklet);
958 static void __tiqdio_inbound_processing(struct qdio_q *q)
960 qperf_inc(q, tasklet_inbound);
961 if (need_siga_sync(q) && need_siga_sync_after_ai(q))
965 * The interrupt could be caused by a PCI request. Check the
966 * PCI capable outbound queues.
968 qdio_check_outbound_after_thinint(q);
970 if (!qdio_inbound_q_moved(q))
973 qdio_kick_handler(q);
975 if (!qdio_inbound_q_done(q)) {
976 qperf_inc(q, tasklet_inbound_resched);
977 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
978 tasklet_schedule(&q->tasklet);
983 qdio_stop_polling(q);
985 * We need to check again to not lose initiative after
986 * resetting the ACK state.
988 if (!qdio_inbound_q_done(q)) {
989 qperf_inc(q, tasklet_inbound_resched2);
990 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
991 tasklet_schedule(&q->tasklet);
995 void tiqdio_inbound_processing(unsigned long data)
997 struct qdio_q *q = (struct qdio_q *)data;
998 __tiqdio_inbound_processing(q);
1001 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
1002 enum qdio_irq_states state)
1004 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
1006 irq_ptr->state = state;
1010 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
1012 if (irb->esw.esw0.erw.cons) {
1013 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
1014 DBF_ERROR_HEX(irb, 64);
1015 DBF_ERROR_HEX(irb->ecw, 64);
1019 /* PCI interrupt handler */
1020 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
1025 if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
1028 for_each_input_queue(irq_ptr, q, i) {
1029 if (q->u.in.queue_start_poll) {
1030 /* skip if polling is enabled or already in work */
1031 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1032 &q->u.in.queue_irq_state)) {
1033 qperf_inc(q, int_discarded);
1036 q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
1037 q->irq_ptr->int_parm);
1039 tasklet_schedule(&q->tasklet);
1043 if (!pci_out_supported(q))
1046 for_each_output_queue(irq_ptr, q, i) {
1047 if (qdio_outbound_q_done(q))
1049 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1050 qdio_siga_sync_q(q);
1051 tasklet_schedule(&q->tasklet);
1055 static void qdio_handle_activate_check(struct ccw_device *cdev,
1056 unsigned long intparm, int cstat, int dstat)
1058 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1062 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1063 DBF_ERROR("intp :%lx", intparm);
1064 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1066 if (irq_ptr->nr_input_qs) {
1067 q = irq_ptr->input_qs[0];
1068 } else if (irq_ptr->nr_output_qs) {
1069 q = irq_ptr->output_qs[0];
1075 count = sub_buf(q->first_to_check, q->first_to_kick);
1076 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE,
1077 q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1079 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1081 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
1082 * Therefore we call the LGR detection function here.
1087 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1090 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1092 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1096 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1098 if (!(dstat & DEV_STAT_DEV_END))
1100 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1104 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1105 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1106 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1109 /* qdio interrupt handler */
1110 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1113 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1116 if (!intparm || !irq_ptr) {
1117 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
1121 if (irq_ptr->perf_stat_enabled)
1122 irq_ptr->perf_stat.qdio_int++;
1125 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
1126 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1127 wake_up(&cdev->private->wait_q);
1130 qdio_irq_check_sense(irq_ptr, irb);
1131 cstat = irb->scsw.cmd.cstat;
1132 dstat = irb->scsw.cmd.dstat;
1134 switch (irq_ptr->state) {
1135 case QDIO_IRQ_STATE_INACTIVE:
1136 qdio_establish_handle_irq(cdev, cstat, dstat);
1138 case QDIO_IRQ_STATE_CLEANUP:
1139 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1141 case QDIO_IRQ_STATE_ESTABLISHED:
1142 case QDIO_IRQ_STATE_ACTIVE:
1143 if (cstat & SCHN_STAT_PCI) {
1144 qdio_int_handler_pci(irq_ptr);
1148 qdio_handle_activate_check(cdev, intparm, cstat,
1151 case QDIO_IRQ_STATE_STOPPED:
1156 wake_up(&cdev->private->wait_q);
1160 * qdio_get_ssqd_desc - get qdio subchannel description
1161 * @cdev: ccw device to get description for
1162 * @data: where to store the ssqd
1164 * Returns 0 or an error code. The results of the chsc are stored in the
1165 * specified structure.
1167 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1168 struct qdio_ssqd_desc *data)
1171 if (!cdev || !cdev->private)
1174 DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1175 return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1177 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1179 static void qdio_shutdown_queues(struct ccw_device *cdev)
1181 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1185 for_each_input_queue(irq_ptr, q, i)
1186 tasklet_kill(&q->tasklet);
1188 for_each_output_queue(irq_ptr, q, i) {
1189 del_timer(&q->u.out.timer);
1190 tasklet_kill(&q->tasklet);
1195 * qdio_shutdown - shut down a qdio subchannel
1196 * @cdev: associated ccw device
1197 * @how: use halt or clear to shutdown
1199 int qdio_shutdown(struct ccw_device *cdev, int how)
1201 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1203 unsigned long flags;
1208 WARN_ON_ONCE(irqs_disabled());
1209 DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1211 mutex_lock(&irq_ptr->setup_mutex);
1213 * Subchannel was already shot down. We cannot prevent being called
1214 * twice since cio may trigger a shutdown asynchronously.
1216 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1217 mutex_unlock(&irq_ptr->setup_mutex);
1222 * Indicate that the device is going down. Scheduling the queue
1223 * tasklets is forbidden from here on.
1225 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1227 tiqdio_remove_input_queues(irq_ptr);
1228 qdio_shutdown_queues(cdev);
1229 qdio_shutdown_debug_entries(irq_ptr, cdev);
1231 /* cleanup subchannel */
1232 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1234 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1235 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1237 /* default behaviour is halt */
1238 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1240 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1241 DBF_ERROR("rc:%4d", rc);
1245 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1246 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1247 wait_event_interruptible_timeout(cdev->private->wait_q,
1248 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1249 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1251 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1254 qdio_shutdown_thinint(irq_ptr);
1256 /* restore interrupt handler */
1257 if ((void *)cdev->handler == (void *)qdio_int_handler)
1258 cdev->handler = irq_ptr->orig_handler;
1259 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1261 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1262 mutex_unlock(&irq_ptr->setup_mutex);
1267 EXPORT_SYMBOL_GPL(qdio_shutdown);
1270 * qdio_free - free data structures for a qdio subchannel
1271 * @cdev: associated ccw device
1273 int qdio_free(struct ccw_device *cdev)
1275 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1280 DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1281 mutex_lock(&irq_ptr->setup_mutex);
1283 if (irq_ptr->debug_area != NULL) {
1284 debug_unregister(irq_ptr->debug_area);
1285 irq_ptr->debug_area = NULL;
1287 cdev->private->qdio_data = NULL;
1288 mutex_unlock(&irq_ptr->setup_mutex);
1290 qdio_release_memory(irq_ptr);
1293 EXPORT_SYMBOL_GPL(qdio_free);
1296 * qdio_allocate - allocate qdio queues and associated data
1297 * @init_data: initialization data
1299 int qdio_allocate(struct qdio_initialize *init_data)
1301 struct qdio_irq *irq_ptr;
1303 DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1305 if ((init_data->no_input_qs && !init_data->input_handler) ||
1306 (init_data->no_output_qs && !init_data->output_handler))
1309 if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1310 (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1313 if ((!init_data->input_sbal_addr_array) ||
1314 (!init_data->output_sbal_addr_array))
1317 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1318 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1322 mutex_init(&irq_ptr->setup_mutex);
1323 qdio_allocate_dbf(init_data, irq_ptr);
1326 * Allocate a page for the chsc calls in qdio_establish.
1327 * Must be pre-allocated since a zfcp recovery will call
1328 * qdio_establish. In case of low memory and swap on a zfcp disk
1329 * we may not be able to allocate memory otherwise.
1331 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1332 if (!irq_ptr->chsc_page)
1335 /* qdr is used in ccw1.cda which is u32 */
1336 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1340 if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1341 init_data->no_output_qs))
1344 init_data->cdev->private->qdio_data = irq_ptr;
1345 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1348 qdio_release_memory(irq_ptr);
1352 EXPORT_SYMBOL_GPL(qdio_allocate);
1354 static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
1356 struct qdio_q *q = irq_ptr->input_qs[0];
1359 if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
1362 for_each_output_queue(irq_ptr, q, i) {
1364 if (qdio_enable_async_operation(&q->u.out) < 0) {
1369 qdio_disable_async_operation(&q->u.out);
1371 DBF_EVENT("use_cq:%d", use_cq);
1375 * qdio_establish - establish queues on a qdio subchannel
1376 * @init_data: initialization data
1378 int qdio_establish(struct qdio_initialize *init_data)
1380 struct qdio_irq *irq_ptr;
1381 struct ccw_device *cdev = init_data->cdev;
1382 unsigned long saveflags;
1385 DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1387 irq_ptr = cdev->private->qdio_data;
1391 if (cdev->private->state != DEV_STATE_ONLINE)
1394 mutex_lock(&irq_ptr->setup_mutex);
1395 qdio_setup_irq(init_data);
1397 rc = qdio_establish_thinint(irq_ptr);
1399 mutex_unlock(&irq_ptr->setup_mutex);
1400 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1405 irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1406 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1407 irq_ptr->ccw.count = irq_ptr->equeue.count;
1408 irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1410 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1411 ccw_device_set_options_mask(cdev, 0);
1413 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1415 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1416 DBF_ERROR("rc:%4x", rc);
1418 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1421 mutex_unlock(&irq_ptr->setup_mutex);
1422 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1426 wait_event_interruptible_timeout(cdev->private->wait_q,
1427 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1428 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1430 if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1431 mutex_unlock(&irq_ptr->setup_mutex);
1432 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1436 qdio_setup_ssqd_info(irq_ptr);
1438 qdio_detect_hsicq(irq_ptr);
1440 /* qebsm is now setup if available, initialize buffer states */
1441 qdio_init_buf_states(irq_ptr);
1443 mutex_unlock(&irq_ptr->setup_mutex);
1444 qdio_print_subchannel_info(irq_ptr, cdev);
1445 qdio_setup_debug_entries(irq_ptr, cdev);
1448 EXPORT_SYMBOL_GPL(qdio_establish);
1451 * qdio_activate - activate queues on a qdio subchannel
1452 * @cdev: associated cdev
1454 int qdio_activate(struct ccw_device *cdev)
1456 struct qdio_irq *irq_ptr;
1458 unsigned long saveflags;
1460 DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1462 irq_ptr = cdev->private->qdio_data;
1466 if (cdev->private->state != DEV_STATE_ONLINE)
1469 mutex_lock(&irq_ptr->setup_mutex);
1470 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1475 irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1476 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1477 irq_ptr->ccw.count = irq_ptr->aqueue.count;
1478 irq_ptr->ccw.cda = 0;
1480 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1481 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1483 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1484 0, DOIO_DENY_PREFETCH);
1486 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1487 DBF_ERROR("rc:%4x", rc);
1489 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1494 if (is_thinint_irq(irq_ptr))
1495 tiqdio_add_input_queues(irq_ptr);
1497 /* wait for subchannel to become active */
1500 switch (irq_ptr->state) {
1501 case QDIO_IRQ_STATE_STOPPED:
1502 case QDIO_IRQ_STATE_ERR:
1506 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1510 mutex_unlock(&irq_ptr->setup_mutex);
1513 EXPORT_SYMBOL_GPL(qdio_activate);
1515 static inline int buf_in_between(int bufnr, int start, int count)
1517 int end = add_buf(start, count);
1520 if (bufnr >= start && bufnr < end)
1526 /* wrap-around case */
1527 if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1535 * handle_inbound - reset processed input buffers
1536 * @q: queue containing the buffers
1538 * @bufnr: first buffer to process
1539 * @count: how many buffers are emptied
1541 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1542 int bufnr, int count)
1546 qperf_inc(q, inbound_call);
1548 if (!q->u.in.polling)
1551 /* protect against stop polling setting an ACK for an emptied slsb */
1552 if (count == QDIO_MAX_BUFFERS_PER_Q) {
1553 /* overwriting everything, just delete polling status */
1554 q->u.in.polling = 0;
1555 q->u.in.ack_count = 0;
1557 } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1559 /* partial overwrite, just update ack_start */
1560 diff = add_buf(bufnr, count);
1561 diff = sub_buf(diff, q->u.in.ack_start);
1562 q->u.in.ack_count -= diff;
1563 if (q->u.in.ack_count <= 0) {
1564 q->u.in.polling = 0;
1565 q->u.in.ack_count = 0;
1568 q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1571 /* the only ACK will be deleted, so stop polling */
1572 q->u.in.polling = 0;
1576 count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1577 used = atomic_add_return(count, &q->nr_buf_used) - count;
1579 if (need_siga_in(q))
1580 return qdio_siga_input(q);
1586 * handle_outbound - process filled outbound buffers
1587 * @q: queue containing the buffers
1589 * @bufnr: first buffer to process
1590 * @count: how many buffers are filled
1592 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1593 int bufnr, int count)
1595 unsigned char state = 0;
1598 qperf_inc(q, outbound_call);
1600 count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1601 used = atomic_add_return(count, &q->nr_buf_used);
1603 if (used == QDIO_MAX_BUFFERS_PER_Q)
1604 qperf_inc(q, outbound_queue_full);
1606 if (callflags & QDIO_FLAG_PCI_OUT) {
1607 q->u.out.pci_out_enabled = 1;
1608 qperf_inc(q, pci_request_int);
1610 q->u.out.pci_out_enabled = 0;
1612 if (queue_type(q) == QDIO_IQDIO_QFMT) {
1613 unsigned long phys_aob = 0;
1615 /* One SIGA-W per buffer required for unicast HSI */
1616 WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
1618 phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
1620 rc = qdio_kick_outbound_q(q, phys_aob);
1621 } else if (need_siga_sync(q)) {
1622 rc = qdio_siga_sync_q(q);
1624 /* try to fast requeue buffers */
1625 get_buf_state(q, prev_buf(bufnr), &state, 0);
1626 if (state != SLSB_CU_OUTPUT_PRIMED)
1627 rc = qdio_kick_outbound_q(q, 0);
1629 qperf_inc(q, fast_requeue);
1632 /* in case of SIGA errors we must process the error immediately */
1633 if (used >= q->u.out.scan_threshold || rc)
1634 tasklet_schedule(&q->tasklet);
1636 /* free the SBALs in case of no further traffic */
1637 if (!timer_pending(&q->u.out.timer))
1638 mod_timer(&q->u.out.timer, jiffies + HZ);
1643 * do_QDIO - process input or output buffers
1644 * @cdev: associated ccw_device for the qdio subchannel
1645 * @callflags: input or output and special flags from the program
1646 * @q_nr: queue number
1647 * @bufnr: buffer number
1648 * @count: how many buffers to process
1650 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1651 int q_nr, unsigned int bufnr, unsigned int count)
1653 struct qdio_irq *irq_ptr;
1655 if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
1658 irq_ptr = cdev->private->qdio_data;
1662 DBF_DEV_EVENT(DBF_INFO, irq_ptr,
1663 "do%02x b:%02x c:%02x", callflags, bufnr, count);
1665 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1669 if (callflags & QDIO_FLAG_SYNC_INPUT)
1670 return handle_inbound(irq_ptr->input_qs[q_nr],
1671 callflags, bufnr, count);
1672 else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1673 return handle_outbound(irq_ptr->output_qs[q_nr],
1674 callflags, bufnr, count);
1677 EXPORT_SYMBOL_GPL(do_QDIO);
1680 * qdio_start_irq - process input buffers
1681 * @cdev: associated ccw_device for the qdio subchannel
1682 * @nr: input queue number
1686 * 1 - irqs not started since new data is available
1688 int qdio_start_irq(struct ccw_device *cdev, int nr)
1691 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1695 q = irq_ptr->input_qs[nr];
1697 clear_nonshared_ind(irq_ptr);
1698 qdio_stop_polling(q);
1699 clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1702 * We need to check again to not lose initiative after
1703 * resetting the ACK state.
1705 if (test_nonshared_ind(irq_ptr))
1707 if (!qdio_inbound_q_done(q))
1712 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1713 &q->u.in.queue_irq_state))
1719 EXPORT_SYMBOL(qdio_start_irq);
1722 * qdio_get_next_buffers - process input buffers
1723 * @cdev: associated ccw_device for the qdio subchannel
1724 * @nr: input queue number
1725 * @bufnr: first filled buffer number
1726 * @error: buffers are in error state
1730 * = 0 - no new buffers found
1731 * > 0 - number of processed buffers
1733 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1738 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1742 q = irq_ptr->input_qs[nr];
1745 * Cannot rely on automatic sync after interrupt since queues may
1746 * also be examined without interrupt.
1748 if (need_siga_sync(q))
1749 qdio_sync_queues(q);
1751 /* check the PCI capable outbound queues. */
1752 qdio_check_outbound_after_thinint(q);
1754 if (!qdio_inbound_q_moved(q))
1757 /* Note: upper-layer MUST stop processing immediately here ... */
1758 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1761 start = q->first_to_kick;
1762 end = q->first_to_check;
1764 *error = q->qdio_error;
1766 /* for the next time */
1767 q->first_to_kick = end;
1769 return sub_buf(end, start);
1771 EXPORT_SYMBOL(qdio_get_next_buffers);
1774 * qdio_stop_irq - disable interrupt processing for the device
1775 * @cdev: associated ccw_device for the qdio subchannel
1776 * @nr: input queue number
1779 * 0 - interrupts were already disabled
1780 * 1 - interrupts successfully disabled
1782 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1785 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1789 q = irq_ptr->input_qs[nr];
1791 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1792 &q->u.in.queue_irq_state))
1797 EXPORT_SYMBOL(qdio_stop_irq);
1799 static int __init init_QDIO(void)
1803 rc = qdio_debug_init();
1806 rc = qdio_setup_init();
1809 rc = tiqdio_allocate_memory();
1812 rc = tiqdio_register_thinints();
1818 tiqdio_free_memory();
1826 static void __exit exit_QDIO(void)
1828 tiqdio_unregister_thinints();
1829 tiqdio_free_memory();
1834 module_init(init_QDIO);
1835 module_exit(exit_QDIO);