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/atomic.h>
19 #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", "memory");
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
76 * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
77 * Note: For IQDC unicast queues only the highest priority queue is processed.
79 static inline int do_siga_output(unsigned long schid, unsigned long mask,
80 unsigned int *bb, unsigned int fc,
83 register unsigned long __fc asm("0") = fc;
84 register unsigned long __schid asm("1") = schid;
85 register unsigned long __mask asm("2") = mask;
86 register unsigned long __aob asm("3") = aob;
87 int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
95 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask),
98 *bb = ((unsigned int) __fc) >> 31;
102 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
104 /* all done or next buffer state different */
105 if (ccq == 0 || ccq == 32)
107 /* no buffer processed */
110 /* not all buffers processed */
113 /* notify devices immediately */
114 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
119 * qdio_do_eqbs - extract buffer states for QEBSM
120 * @q: queue to manipulate
121 * @state: state of the extracted buffers
122 * @start: buffer number to start at
123 * @count: count of buffers to examine
124 * @auto_ack: automatically acknowledge buffers
126 * Returns the number of successfully extracted equal buffer states.
127 * Stops processing if a state is different from the last buffers state.
129 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
130 int start, int count, int auto_ack)
132 int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0;
133 unsigned int ccq = 0;
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 return count - tmp_count;
148 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
153 BUG_ON(tmp_count == count);
154 qperf_inc(q, eqbs_partial);
155 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
158 * Retry once, if that fails bail out and process the
159 * extracted buffers before trying again.
164 return count - tmp_count;
167 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
168 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
169 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
170 0, -1, -1, q->irq_ptr->int_parm);
175 * qdio_do_sqbs - set buffer states for QEBSM
176 * @q: queue to manipulate
177 * @state: new state of the buffers
178 * @start: first buffer number to change
179 * @count: how many buffers to change
181 * Returns the number of successfully changed buffers.
182 * Does retrying until the specified count of buffer states is set or an
185 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
188 unsigned int ccq = 0;
189 int tmp_count = count, tmp_start = start;
196 BUG_ON(!q->irq_ptr->sch_token);
200 nr += q->irq_ptr->nr_input_qs;
202 ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
203 rc = qdio_check_ccq(q, ccq);
206 return count - tmp_count;
209 if (rc == 1 || rc == 2) {
210 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
211 qperf_inc(q, sqbs_partial);
215 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
216 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
217 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
218 0, -1, -1, q->irq_ptr->int_parm);
222 /* returns number of examined buffers and their common state in *state */
223 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
224 unsigned char *state, unsigned int count,
225 int auto_ack, int merge_pending)
227 unsigned char __state = 0;
230 BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
231 BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
234 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
236 for (i = 0; i < count; i++) {
238 __state = q->slsb.val[bufnr];
239 if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
240 __state = SLSB_P_OUTPUT_EMPTY;
241 } else if (merge_pending) {
242 if ((q->slsb.val[bufnr] & __state) != __state)
244 } else if (q->slsb.val[bufnr] != __state)
246 bufnr = next_buf(bufnr);
252 static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
253 unsigned char *state, int auto_ack)
255 return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
258 /* wrap-around safe setting of slsb states, returns number of changed buffers */
259 static inline int set_buf_states(struct qdio_q *q, int bufnr,
260 unsigned char state, int count)
264 BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
265 BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
268 return qdio_do_sqbs(q, state, bufnr, count);
270 for (i = 0; i < count; i++) {
271 xchg(&q->slsb.val[bufnr], state);
272 bufnr = next_buf(bufnr);
277 static inline int set_buf_state(struct qdio_q *q, int bufnr,
280 return set_buf_states(q, bufnr, state, 1);
283 /* set slsb states to initial state */
284 static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
289 for_each_input_queue(irq_ptr, q, i)
290 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
291 QDIO_MAX_BUFFERS_PER_Q);
292 for_each_output_queue(irq_ptr, q, i)
293 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
294 QDIO_MAX_BUFFERS_PER_Q);
297 static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
300 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
301 unsigned int fc = QDIO_SIGA_SYNC;
304 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
305 qperf_inc(q, siga_sync);
308 schid = q->irq_ptr->sch_token;
309 fc |= QDIO_SIGA_QEBSM_FLAG;
312 cc = do_siga_sync(schid, output, input, fc);
314 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
318 static inline int qdio_siga_sync_q(struct qdio_q *q)
321 return qdio_siga_sync(q, 0, q->mask);
323 return qdio_siga_sync(q, q->mask, 0);
326 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
329 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
330 unsigned int fc = QDIO_SIGA_WRITE;
333 unsigned long laob = 0;
335 if (q->u.out.use_cq && aob != 0) {
336 fc = QDIO_SIGA_WRITEQ;
341 schid = q->irq_ptr->sch_token;
342 fc |= QDIO_SIGA_QEBSM_FLAG;
345 WARN_ON_ONCE((aob && queue_type(q) != QDIO_IQDIO_QFMT) ||
346 (aob && fc != QDIO_SIGA_WRITEQ));
347 cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
349 /* hipersocket busy condition */
350 if (unlikely(*busy_bit)) {
351 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
355 start_time = get_clock();
358 if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE)
362 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
363 "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
364 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
369 static inline int qdio_siga_input(struct qdio_q *q)
371 unsigned long schid = *((u32 *) &q->irq_ptr->schid);
372 unsigned int fc = QDIO_SIGA_READ;
375 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
376 qperf_inc(q, siga_read);
379 schid = q->irq_ptr->sch_token;
380 fc |= QDIO_SIGA_QEBSM_FLAG;
383 cc = do_siga_input(schid, q->mask, fc);
385 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
389 #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
390 #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
392 static inline void qdio_sync_queues(struct qdio_q *q)
394 /* PCI capable outbound queues will also be scanned so sync them too */
395 if (pci_out_supported(q))
396 qdio_siga_sync_all(q);
401 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
402 unsigned char *state)
404 if (need_siga_sync(q))
406 return get_buf_states(q, bufnr, state, 1, 0, 0);
409 static inline void qdio_stop_polling(struct qdio_q *q)
411 if (!q->u.in.polling)
415 qperf_inc(q, stop_polling);
417 /* show the card that we are not polling anymore */
419 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
421 q->u.in.ack_count = 0;
423 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
426 static inline void account_sbals(struct qdio_q *q, int count)
430 q->q_stats.nr_sbal_total += count;
431 if (count == QDIO_MAX_BUFFERS_MASK) {
432 q->q_stats.nr_sbals[7]++;
437 q->q_stats.nr_sbals[pos]++;
440 static void process_buffer_error(struct qdio_q *q, int count)
442 unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
443 SLSB_P_OUTPUT_NOT_INIT;
445 q->qdio_error |= QDIO_ERROR_SLSB_STATE;
447 /* special handling for no target buffer empty */
448 if ((!q->is_input_q &&
449 (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
450 qperf_inc(q, target_full);
451 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
456 DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
457 DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
458 DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
459 DBF_ERROR("F14:%2x F15:%2x",
460 q->sbal[q->first_to_check]->element[14].sflags,
461 q->sbal[q->first_to_check]->element[15].sflags);
465 * Interrupts may be avoided as long as the error is present
466 * so change the buffer state immediately to avoid starvation.
468 set_buf_states(q, q->first_to_check, state, count);
471 static inline void inbound_primed(struct qdio_q *q, int count)
475 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
477 /* for QEBSM the ACK was already set by EQBS */
479 if (!q->u.in.polling) {
481 q->u.in.ack_count = count;
482 q->u.in.ack_start = q->first_to_check;
486 /* delete the previous ACK's */
487 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
489 q->u.in.ack_count = count;
490 q->u.in.ack_start = q->first_to_check;
495 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
496 * or by the next inbound run.
498 new = add_buf(q->first_to_check, count - 1);
499 if (q->u.in.polling) {
500 /* reset the previous ACK but first set the new one */
501 set_buf_state(q, new, SLSB_P_INPUT_ACK);
502 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
505 set_buf_state(q, new, SLSB_P_INPUT_ACK);
508 q->u.in.ack_start = new;
512 /* need to change ALL buffers to get more interrupts */
513 set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
516 static int get_inbound_buffer_frontier(struct qdio_q *q)
519 unsigned char state = 0;
521 q->timestamp = get_clock_fast();
524 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
527 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
528 stop = add_buf(q->first_to_check, count);
530 if (q->first_to_check == stop)
534 * No siga sync here, as a PCI or we after a thin interrupt
535 * already sync'ed the queues.
537 count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
542 case SLSB_P_INPUT_PRIMED:
543 inbound_primed(q, count);
544 q->first_to_check = add_buf(q->first_to_check, count);
545 if (atomic_sub(count, &q->nr_buf_used) == 0)
546 qperf_inc(q, inbound_queue_full);
547 if (q->irq_ptr->perf_stat_enabled)
548 account_sbals(q, count);
550 case SLSB_P_INPUT_ERROR:
551 process_buffer_error(q, count);
552 q->first_to_check = add_buf(q->first_to_check, count);
553 atomic_sub(count, &q->nr_buf_used);
554 if (q->irq_ptr->perf_stat_enabled)
555 account_sbals_error(q, count);
557 case SLSB_CU_INPUT_EMPTY:
558 case SLSB_P_INPUT_NOT_INIT:
559 case SLSB_P_INPUT_ACK:
560 if (q->irq_ptr->perf_stat_enabled)
561 q->q_stats.nr_sbal_nop++;
562 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
568 return q->first_to_check;
571 static int qdio_inbound_q_moved(struct qdio_q *q)
575 bufnr = get_inbound_buffer_frontier(q);
577 if ((bufnr != q->last_move) || q->qdio_error) {
578 q->last_move = bufnr;
579 if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
580 q->u.in.timestamp = get_clock();
586 static inline int qdio_inbound_q_done(struct qdio_q *q)
588 unsigned char state = 0;
590 if (!atomic_read(&q->nr_buf_used))
593 if (need_siga_sync(q))
595 get_buf_state(q, q->first_to_check, &state, 0);
597 if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
598 /* more work coming */
601 if (is_thinint_irq(q->irq_ptr))
604 /* don't poll under z/VM */
609 * At this point we know, that inbound first_to_check
610 * has (probably) not moved (see qdio_inbound_processing).
612 if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
613 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
620 static inline int contains_aobs(struct qdio_q *q)
622 return !q->is_input_q && q->u.out.use_cq;
625 static inline void qdio_trace_aob(struct qdio_irq *irq, struct qdio_q *q,
626 int i, struct qaob *aob)
630 DBF_DEV_EVENT(DBF_INFO, irq, "AOB%d:%lx", i,
631 (unsigned long) virt_to_phys(aob));
632 DBF_DEV_EVENT(DBF_INFO, irq, "RES00:%lx",
633 (unsigned long) aob->res0[0]);
634 DBF_DEV_EVENT(DBF_INFO, irq, "RES01:%lx",
635 (unsigned long) aob->res0[1]);
636 DBF_DEV_EVENT(DBF_INFO, irq, "RES02:%lx",
637 (unsigned long) aob->res0[2]);
638 DBF_DEV_EVENT(DBF_INFO, irq, "RES03:%lx",
639 (unsigned long) aob->res0[3]);
640 DBF_DEV_EVENT(DBF_INFO, irq, "RES04:%lx",
641 (unsigned long) aob->res0[4]);
642 DBF_DEV_EVENT(DBF_INFO, irq, "RES05:%lx",
643 (unsigned long) aob->res0[5]);
644 DBF_DEV_EVENT(DBF_INFO, irq, "RES1:%x", aob->res1);
645 DBF_DEV_EVENT(DBF_INFO, irq, "RES2:%x", aob->res2);
646 DBF_DEV_EVENT(DBF_INFO, irq, "RES3:%x", aob->res3);
647 DBF_DEV_EVENT(DBF_INFO, irq, "AORC:%u", aob->aorc);
648 DBF_DEV_EVENT(DBF_INFO, irq, "FLAGS:%u", aob->flags);
649 DBF_DEV_EVENT(DBF_INFO, irq, "CBTBS:%u", aob->cbtbs);
650 DBF_DEV_EVENT(DBF_INFO, irq, "SBC:%u", aob->sb_count);
651 for (tmp = 0; tmp < QDIO_MAX_ELEMENTS_PER_BUFFER; ++tmp) {
652 DBF_DEV_EVENT(DBF_INFO, irq, "SBA%d:%lx", tmp,
653 (unsigned long) aob->sba[tmp]);
654 DBF_DEV_EVENT(DBF_INFO, irq, "rSBA%d:%lx", tmp,
655 (unsigned long) q->sbal[i]->element[tmp].addr);
656 DBF_DEV_EVENT(DBF_INFO, irq, "DC%d:%u", tmp, aob->dcount[tmp]);
657 DBF_DEV_EVENT(DBF_INFO, irq, "rDC%d:%u", tmp,
658 q->sbal[i]->element[tmp].length);
660 DBF_DEV_EVENT(DBF_INFO, irq, "USER0:%lx", (unsigned long) aob->user0);
661 for (tmp = 0; tmp < 2; ++tmp) {
662 DBF_DEV_EVENT(DBF_INFO, irq, "RES4%d:%lx", tmp,
663 (unsigned long) aob->res4[tmp]);
665 DBF_DEV_EVENT(DBF_INFO, irq, "USER1:%lx", (unsigned long) aob->user1);
666 DBF_DEV_EVENT(DBF_INFO, irq, "USER2:%lx", (unsigned long) aob->user2);
669 static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
671 unsigned char state = 0;
674 if (!contains_aobs(q))
677 for (j = 0; j < count; ++j) {
678 get_buf_state(q, b, &state, 0);
679 if (state == SLSB_P_OUTPUT_PENDING) {
680 struct qaob *aob = q->u.out.aobs[b];
684 BUG_ON(q->u.out.sbal_state == NULL);
685 q->u.out.sbal_state[b].flags |=
686 QDIO_OUTBUF_STATE_FLAG_PENDING;
687 q->u.out.aobs[b] = NULL;
688 } else if (state == SLSB_P_OUTPUT_EMPTY) {
689 BUG_ON(q->u.out.sbal_state == NULL);
690 q->u.out.sbal_state[b].aob = NULL;
696 static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
699 unsigned long phys_aob = 0;
704 if (!q->aobs[bufnr]) {
705 struct qaob *aob = qdio_allocate_aob();
706 q->aobs[bufnr] = aob;
708 if (q->aobs[bufnr]) {
709 BUG_ON(q->sbal_state == NULL);
710 q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
711 q->sbal_state[bufnr].aob = q->aobs[bufnr];
712 q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
713 phys_aob = virt_to_phys(q->aobs[bufnr]);
714 BUG_ON(phys_aob & 0xFF);
721 static void qdio_kick_handler(struct qdio_q *q)
723 int start = q->first_to_kick;
724 int end = q->first_to_check;
727 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
730 count = sub_buf(end, start);
733 qperf_inc(q, inbound_handler);
734 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
736 qperf_inc(q, outbound_handler);
737 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
741 qdio_handle_aobs(q, start, count);
743 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
744 q->irq_ptr->int_parm);
746 /* for the next time */
747 q->first_to_kick = end;
751 static void __qdio_inbound_processing(struct qdio_q *q)
753 qperf_inc(q, tasklet_inbound);
755 if (!qdio_inbound_q_moved(q))
758 qdio_kick_handler(q);
760 if (!qdio_inbound_q_done(q)) {
761 /* means poll time is not yet over */
762 qperf_inc(q, tasklet_inbound_resched);
763 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
764 tasklet_schedule(&q->tasklet);
769 qdio_stop_polling(q);
771 * We need to check again to not lose initiative after
772 * resetting the ACK state.
774 if (!qdio_inbound_q_done(q)) {
775 qperf_inc(q, tasklet_inbound_resched2);
776 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
777 tasklet_schedule(&q->tasklet);
781 void qdio_inbound_processing(unsigned long data)
783 struct qdio_q *q = (struct qdio_q *)data;
784 __qdio_inbound_processing(q);
787 static int get_outbound_buffer_frontier(struct qdio_q *q)
790 unsigned char state = 0;
792 q->timestamp = get_clock_fast();
794 if (need_siga_sync(q))
795 if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
796 !pci_out_supported(q)) ||
797 (queue_type(q) == QDIO_IQDIO_QFMT &&
798 multicast_outbound(q)))
802 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
805 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
806 stop = add_buf(q->first_to_check, count);
807 if (q->first_to_check == stop)
810 count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
815 case SLSB_P_OUTPUT_PENDING:
817 case SLSB_P_OUTPUT_EMPTY:
818 /* the adapter got it */
819 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
820 "out empty:%1d %02x", q->nr, count);
822 atomic_sub(count, &q->nr_buf_used);
823 q->first_to_check = add_buf(q->first_to_check, count);
824 if (q->irq_ptr->perf_stat_enabled)
825 account_sbals(q, count);
828 case SLSB_P_OUTPUT_ERROR:
829 process_buffer_error(q, count);
830 q->first_to_check = add_buf(q->first_to_check, count);
831 atomic_sub(count, &q->nr_buf_used);
832 if (q->irq_ptr->perf_stat_enabled)
833 account_sbals_error(q, count);
835 case SLSB_CU_OUTPUT_PRIMED:
836 /* the adapter has not fetched the output yet */
837 if (q->irq_ptr->perf_stat_enabled)
838 q->q_stats.nr_sbal_nop++;
839 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
842 case SLSB_P_OUTPUT_NOT_INIT:
843 case SLSB_P_OUTPUT_HALTED:
850 return q->first_to_check;
853 /* all buffers processed? */
854 static inline int qdio_outbound_q_done(struct qdio_q *q)
856 return atomic_read(&q->nr_buf_used) == 0;
859 static inline int qdio_outbound_q_moved(struct qdio_q *q)
863 bufnr = get_outbound_buffer_frontier(q);
865 if ((bufnr != q->last_move) || q->qdio_error) {
866 q->last_move = bufnr;
867 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
873 static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
876 unsigned int busy_bit;
878 if (!need_siga_out(q))
881 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
883 qperf_inc(q, siga_write);
885 cc = qdio_siga_output(q, &busy_bit, aob);
891 while (++retries < QDIO_BUSY_BIT_RETRIES) {
892 mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
895 DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
896 cc |= QDIO_ERROR_SIGA_BUSY;
898 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
902 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
906 DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
907 DBF_ERROR("count:%u", retries);
912 static void __qdio_outbound_processing(struct qdio_q *q)
914 qperf_inc(q, tasklet_outbound);
915 BUG_ON(atomic_read(&q->nr_buf_used) < 0);
917 if (qdio_outbound_q_moved(q))
918 qdio_kick_handler(q);
920 if (queue_type(q) == QDIO_ZFCP_QFMT)
921 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
924 if (q->u.out.pci_out_enabled)
928 * Now we know that queue type is either qeth without pci enabled
929 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
930 * is noticed and outbound_handler is called after some time.
932 if (qdio_outbound_q_done(q))
933 del_timer(&q->u.out.timer);
935 if (!timer_pending(&q->u.out.timer))
936 mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
940 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
942 tasklet_schedule(&q->tasklet);
945 /* outbound tasklet */
946 void qdio_outbound_processing(unsigned long data)
948 struct qdio_q *q = (struct qdio_q *)data;
949 __qdio_outbound_processing(q);
952 void qdio_outbound_timer(unsigned long data)
954 struct qdio_q *q = (struct qdio_q *)data;
956 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
958 tasklet_schedule(&q->tasklet);
961 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
966 if (!pci_out_supported(q))
969 for_each_output_queue(q->irq_ptr, out, i)
970 if (!qdio_outbound_q_done(out))
971 tasklet_schedule(&out->tasklet);
974 static void __tiqdio_inbound_processing(struct qdio_q *q)
976 qperf_inc(q, tasklet_inbound);
977 if (need_siga_sync(q) && need_siga_sync_after_ai(q))
981 * The interrupt could be caused by a PCI request. Check the
982 * PCI capable outbound queues.
984 qdio_check_outbound_after_thinint(q);
986 if (!qdio_inbound_q_moved(q))
989 qdio_kick_handler(q);
991 if (!qdio_inbound_q_done(q)) {
992 qperf_inc(q, tasklet_inbound_resched);
993 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
994 tasklet_schedule(&q->tasklet);
999 qdio_stop_polling(q);
1001 * We need to check again to not lose initiative after
1002 * resetting the ACK state.
1004 if (!qdio_inbound_q_done(q)) {
1005 qperf_inc(q, tasklet_inbound_resched2);
1006 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
1007 tasklet_schedule(&q->tasklet);
1011 void tiqdio_inbound_processing(unsigned long data)
1013 struct qdio_q *q = (struct qdio_q *)data;
1014 __tiqdio_inbound_processing(q);
1017 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
1018 enum qdio_irq_states state)
1020 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
1022 irq_ptr->state = state;
1026 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
1028 if (irb->esw.esw0.erw.cons) {
1029 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
1030 DBF_ERROR_HEX(irb, 64);
1031 DBF_ERROR_HEX(irb->ecw, 64);
1035 /* PCI interrupt handler */
1036 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
1041 if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
1044 for_each_input_queue(irq_ptr, q, i) {
1045 if (q->u.in.queue_start_poll) {
1046 /* skip if polling is enabled or already in work */
1047 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1048 &q->u.in.queue_irq_state)) {
1049 qperf_inc(q, int_discarded);
1052 q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
1053 q->irq_ptr->int_parm);
1055 tasklet_schedule(&q->tasklet);
1059 if (!pci_out_supported(q))
1062 for_each_output_queue(irq_ptr, q, i) {
1063 if (qdio_outbound_q_done(q))
1065 if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
1066 qdio_siga_sync_q(q);
1067 tasklet_schedule(&q->tasklet);
1071 static void qdio_handle_activate_check(struct ccw_device *cdev,
1072 unsigned long intparm, int cstat, int dstat)
1074 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1078 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
1079 DBF_ERROR("intp :%lx", intparm);
1080 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1082 if (irq_ptr->nr_input_qs) {
1083 q = irq_ptr->input_qs[0];
1084 } else if (irq_ptr->nr_output_qs) {
1085 q = irq_ptr->output_qs[0];
1091 count = sub_buf(q->first_to_check, q->first_to_kick);
1092 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
1093 q->nr, q->first_to_kick, count, irq_ptr->int_parm);
1095 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1098 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
1101 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1103 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
1107 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
1109 if (!(dstat & DEV_STAT_DEV_END))
1111 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
1115 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
1116 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
1117 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
1120 /* qdio interrupt handler */
1121 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
1124 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1127 if (!intparm || !irq_ptr) {
1128 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
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));
1722 clear_nonshared_ind(irq_ptr);
1723 qdio_stop_polling(q);
1724 clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
1727 * We need to check again to not lose initiative after
1728 * resetting the ACK state.
1730 if (test_nonshared_ind(irq_ptr))
1732 if (!qdio_inbound_q_done(q))
1737 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1738 &q->u.in.queue_irq_state))
1744 EXPORT_SYMBOL(qdio_start_irq);
1747 * qdio_get_next_buffers - process input buffers
1748 * @cdev: associated ccw_device for the qdio subchannel
1749 * @nr: input queue number
1750 * @bufnr: first filled buffer number
1751 * @error: buffers are in error state
1755 * = 0 - no new buffers found
1756 * > 0 - number of processed buffers
1758 int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
1763 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1767 q = irq_ptr->input_qs[nr];
1768 WARN_ON(queue_irqs_enabled(q));
1771 * Cannot rely on automatic sync after interrupt since queues may
1772 * also be examined without interrupt.
1774 if (need_siga_sync(q))
1775 qdio_sync_queues(q);
1777 /* check the PCI capable outbound queues. */
1778 qdio_check_outbound_after_thinint(q);
1780 if (!qdio_inbound_q_moved(q))
1783 /* Note: upper-layer MUST stop processing immediately here ... */
1784 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
1787 start = q->first_to_kick;
1788 end = q->first_to_check;
1790 *error = q->qdio_error;
1792 /* for the next time */
1793 q->first_to_kick = end;
1795 return sub_buf(end, start);
1797 EXPORT_SYMBOL(qdio_get_next_buffers);
1800 * qdio_stop_irq - disable interrupt processing for the device
1801 * @cdev: associated ccw_device for the qdio subchannel
1802 * @nr: input queue number
1805 * 0 - interrupts were already disabled
1806 * 1 - interrupts successfully disabled
1808 int qdio_stop_irq(struct ccw_device *cdev, int nr)
1811 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1815 q = irq_ptr->input_qs[nr];
1817 if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
1818 &q->u.in.queue_irq_state))
1823 EXPORT_SYMBOL(qdio_stop_irq);
1825 static int __init init_QDIO(void)
1829 rc = qdio_debug_init();
1832 rc = qdio_setup_init();
1835 rc = tiqdio_allocate_memory();
1838 rc = tiqdio_register_thinints();
1844 tiqdio_free_memory();
1852 static void __exit exit_QDIO(void)
1854 tiqdio_unregister_thinints();
1855 tiqdio_free_memory();
1860 module_init(init_QDIO);
1861 module_exit(exit_QDIO);