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 <asm/atomic.h>
17 #include <asm/debug.h>
24 #include "qdio_debug.h"
25 #include "qdio_perf.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(struct subchannel_id schid,
33 unsigned int out_mask, unsigned int in_mask)
35 register unsigned long __fc asm ("0") = 2;
36 register struct subchannel_id __schid asm ("1") = schid;
37 register unsigned long out asm ("2") = out_mask;
38 register unsigned long in asm ("3") = in_mask;
46 : "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
50 static inline int do_siga_input(struct subchannel_id schid, unsigned int mask)
52 register unsigned long __fc asm ("0") = 1;
53 register struct subchannel_id __schid asm ("1") = schid;
54 register unsigned long __mask asm ("2") = mask;
62 : "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
67 * do_siga_output - perform SIGA-w/wt function
68 * @schid: subchannel id or in case of QEBSM the subchannel token
69 * @mask: which output queues to process
70 * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
71 * @fc: function code to perform
73 * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
74 * Note: For IQDC unicast queues only the highest priority queue is processed.
76 static inline int do_siga_output(unsigned long schid, unsigned long mask,
77 unsigned int *bb, unsigned int fc)
79 register unsigned long __fc asm("0") = fc;
80 register unsigned long __schid asm("1") = schid;
81 register unsigned long __mask asm("2") = mask;
82 int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
90 : "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask)
92 *bb = ((unsigned int) __fc) >> 31;
96 static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
98 /* all done or next buffer state different */
99 if (ccq == 0 || ccq == 32)
101 /* not all buffers processed */
102 if (ccq == 96 || ccq == 97)
104 /* notify devices immediately */
105 DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
110 * qdio_do_eqbs - extract buffer states for QEBSM
111 * @q: queue to manipulate
112 * @state: state of the extracted buffers
113 * @start: buffer number to start at
114 * @count: count of buffers to examine
115 * @auto_ack: automatically acknowledge buffers
117 * Returns the number of successfully extracted equal buffer states.
118 * Stops processing if a state is different from the last buffers state.
120 static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
121 int start, int count, int auto_ack)
123 unsigned int ccq = 0;
124 int tmp_count = count, tmp_start = start;
128 BUG_ON(!q->irq_ptr->sch_token);
129 qdio_perf_stat_inc(&perf_stats.debug_eqbs_all);
132 nr += q->irq_ptr->nr_input_qs;
134 ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
136 rc = qdio_check_ccq(q, ccq);
138 /* At least one buffer was processed, return and extract the remaining
141 if ((ccq == 96) && (count != tmp_count)) {
142 qdio_perf_stat_inc(&perf_stats.debug_eqbs_incomplete);
143 return (count - tmp_count);
147 DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
152 DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
153 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
154 q->handler(q->irq_ptr->cdev,
155 QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
156 0, -1, -1, q->irq_ptr->int_parm);
159 return count - tmp_count;
163 * qdio_do_sqbs - set buffer states for QEBSM
164 * @q: queue to manipulate
165 * @state: new state of the buffers
166 * @start: first buffer number to change
167 * @count: how many buffers to change
169 * Returns the number of successfully changed buffers.
170 * Does retrying until the specified count of buffer states is set or an
173 static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
176 unsigned int ccq = 0;
177 int tmp_count = count, tmp_start = start;
184 BUG_ON(!q->irq_ptr->sch_token);
185 qdio_perf_stat_inc(&perf_stats.debug_sqbs_all);
188 nr += q->irq_ptr->nr_input_qs;
190 ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
191 rc = qdio_check_ccq(q, ccq);
193 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
194 qdio_perf_stat_inc(&perf_stats.debug_sqbs_incomplete);
198 DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
199 DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
200 q->handler(q->irq_ptr->cdev,
201 QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
202 0, -1, -1, q->irq_ptr->int_parm);
206 return count - tmp_count;
209 /* returns number of examined buffers and their common state in *state */
210 static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
211 unsigned char *state, unsigned int count,
214 unsigned char __state = 0;
217 BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
218 BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
221 return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
223 for (i = 0; i < count; i++) {
225 __state = q->slsb.val[bufnr];
226 else if (q->slsb.val[bufnr] != __state)
228 bufnr = next_buf(bufnr);
234 inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
235 unsigned char *state, int auto_ack)
237 return get_buf_states(q, bufnr, state, 1, auto_ack);
240 /* wrap-around safe setting of slsb states, returns number of changed buffers */
241 static inline int set_buf_states(struct qdio_q *q, int bufnr,
242 unsigned char state, int count)
246 BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
247 BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
250 return qdio_do_sqbs(q, state, bufnr, count);
252 for (i = 0; i < count; i++) {
253 xchg(&q->slsb.val[bufnr], state);
254 bufnr = next_buf(bufnr);
259 static inline int set_buf_state(struct qdio_q *q, int bufnr,
262 return set_buf_states(q, bufnr, state, 1);
265 /* set slsb states to initial state */
266 void qdio_init_buf_states(struct qdio_irq *irq_ptr)
271 for_each_input_queue(irq_ptr, q, i)
272 set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
273 QDIO_MAX_BUFFERS_PER_Q);
274 for_each_output_queue(irq_ptr, q, i)
275 set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
276 QDIO_MAX_BUFFERS_PER_Q);
279 static int qdio_siga_sync(struct qdio_q *q, unsigned int output,
284 if (!need_siga_sync(q))
287 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
288 qdio_perf_stat_inc(&perf_stats.siga_sync);
290 cc = do_siga_sync(q->irq_ptr->schid, output, input);
292 DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
296 inline int qdio_siga_sync_q(struct qdio_q *q)
299 return qdio_siga_sync(q, 0, q->mask);
301 return qdio_siga_sync(q, q->mask, 0);
304 static inline int qdio_siga_sync_out(struct qdio_q *q)
306 return qdio_siga_sync(q, ~0U, 0);
309 static inline int qdio_siga_sync_all(struct qdio_q *q)
311 return qdio_siga_sync(q, ~0U, ~0U);
314 static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
321 if (q->u.out.use_enh_siga)
325 schid = q->irq_ptr->sch_token;
329 schid = *((u32 *)&q->irq_ptr->schid);
332 cc = do_siga_output(schid, q->mask, busy_bit, fc);
334 /* hipersocket busy condition */
336 WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
339 start_time = get_usecs();
342 if ((get_usecs() - start_time) < QDIO_BUSY_BIT_PATIENCE)
348 static inline int qdio_siga_input(struct qdio_q *q)
352 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
353 qdio_perf_stat_inc(&perf_stats.siga_in);
355 cc = do_siga_input(q->irq_ptr->schid, q->mask);
357 DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
361 /* called from thinint inbound handler */
362 void qdio_sync_after_thinint(struct qdio_q *q)
364 if (pci_out_supported(q)) {
365 if (need_siga_sync_thinint(q))
366 qdio_siga_sync_all(q);
367 else if (need_siga_sync_out_thinint(q))
368 qdio_siga_sync_out(q);
373 inline void qdio_stop_polling(struct qdio_q *q)
375 if (!q->u.in.polling)
379 qdio_perf_stat_inc(&perf_stats.debug_stop_polling);
381 /* show the card that we are not polling anymore */
383 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
385 q->u.in.ack_count = 0;
387 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
390 static void announce_buffer_error(struct qdio_q *q, int count)
392 q->qdio_error |= QDIO_ERROR_SLSB_STATE;
394 /* special handling for no target buffer empty */
395 if ((!q->is_input_q &&
396 (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
397 qdio_perf_stat_inc(&perf_stats.outbound_target_full);
398 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%3d",
403 DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
404 DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
405 DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
406 DBF_ERROR("F14:%2x F15:%2x",
407 q->sbal[q->first_to_check]->element[14].flags & 0xff,
408 q->sbal[q->first_to_check]->element[15].flags & 0xff);
411 static inline void inbound_primed(struct qdio_q *q, int count)
415 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %3d", count);
417 /* for QEBSM the ACK was already set by EQBS */
419 if (!q->u.in.polling) {
421 q->u.in.ack_count = count;
422 q->u.in.ack_start = q->first_to_check;
426 /* delete the previous ACK's */
427 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
429 q->u.in.ack_count = count;
430 q->u.in.ack_start = q->first_to_check;
435 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
436 * or by the next inbound run.
438 new = add_buf(q->first_to_check, count - 1);
439 if (q->u.in.polling) {
440 /* reset the previous ACK but first set the new one */
441 set_buf_state(q, new, SLSB_P_INPUT_ACK);
442 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
445 set_buf_state(q, new, SLSB_P_INPUT_ACK);
448 q->u.in.ack_start = new;
454 * Need to change all PRIMED buffers to NOT_INIT, otherwise
455 * we're loosing initiative in the thinint code.
457 set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT,
461 static int get_inbound_buffer_frontier(struct qdio_q *q)
467 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
470 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
471 stop = add_buf(q->first_to_check, count);
474 * No siga sync here, as a PCI or we after a thin interrupt
475 * will sync the queues.
478 /* need to set count to 1 for non-qebsm */
483 if (q->first_to_check == stop)
486 count = get_buf_states(q, q->first_to_check, &state, count, 1);
491 case SLSB_P_INPUT_PRIMED:
492 inbound_primed(q, count);
494 * No siga-sync needed for non-qebsm here, as the inbound queue
495 * will be synced on the next siga-r, resp.
496 * tiqdio_is_inbound_q_done will do the siga-sync.
498 q->first_to_check = add_buf(q->first_to_check, count);
499 atomic_sub(count, &q->nr_buf_used);
501 case SLSB_P_INPUT_ERROR:
502 announce_buffer_error(q, count);
503 /* process the buffer, the upper layer will take care of it */
504 q->first_to_check = add_buf(q->first_to_check, count);
505 atomic_sub(count, &q->nr_buf_used);
507 case SLSB_CU_INPUT_EMPTY:
508 case SLSB_P_INPUT_NOT_INIT:
509 case SLSB_P_INPUT_ACK:
510 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
516 return q->first_to_check;
519 int qdio_inbound_q_moved(struct qdio_q *q)
523 bufnr = get_inbound_buffer_frontier(q);
525 if ((bufnr != q->last_move) || q->qdio_error) {
526 q->last_move = bufnr;
527 if (!need_siga_sync(q) && !pci_out_supported(q))
528 q->u.in.timestamp = get_usecs();
530 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in moved");
536 static int qdio_inbound_q_done(struct qdio_q *q)
538 unsigned char state = 0;
540 if (!atomic_read(&q->nr_buf_used))
544 * We need that one for synchronization with the adapter, as it
545 * does a kind of PCI avoidance.
549 get_buf_state(q, q->first_to_check, &state, 0);
550 if (state == SLSB_P_INPUT_PRIMED)
551 /* we got something to do */
554 /* on VM, we don't poll, so the q is always done here */
555 if (need_siga_sync(q) || pci_out_supported(q))
559 * At this point we know, that inbound first_to_check
560 * has (probably) not moved (see qdio_inbound_processing).
562 if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
563 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%3d",
567 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in notd:%3d",
573 void qdio_kick_handler(struct qdio_q *q)
575 int start = q->first_to_kick;
576 int end = q->first_to_check;
579 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
582 count = sub_buf(end, start);
585 qdio_perf_stat_inc(&perf_stats.inbound_handler);
586 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%3d c:%3d", start, count);
588 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: nr:%1d", q->nr);
589 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "s:%3d c:%3d", start, count);
592 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
593 q->irq_ptr->int_parm);
595 /* for the next time */
596 q->first_to_kick = end;
600 static void __qdio_inbound_processing(struct qdio_q *q)
602 qdio_perf_stat_inc(&perf_stats.tasklet_inbound);
604 if (!qdio_inbound_q_moved(q))
607 qdio_kick_handler(q);
609 if (!qdio_inbound_q_done(q))
610 /* means poll time is not yet over */
613 qdio_stop_polling(q);
615 * We need to check again to not lose initiative after
616 * resetting the ACK state.
618 if (!qdio_inbound_q_done(q))
622 /* inbound tasklet */
623 void qdio_inbound_processing(unsigned long data)
625 struct qdio_q *q = (struct qdio_q *)data;
626 __qdio_inbound_processing(q);
629 static int get_outbound_buffer_frontier(struct qdio_q *q)
634 if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
635 (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
639 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
642 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
643 stop = add_buf(q->first_to_check, count);
645 /* need to set count to 1 for non-qebsm */
650 if (q->first_to_check == stop)
651 return q->first_to_check;
653 count = get_buf_states(q, q->first_to_check, &state, count, 0);
655 return q->first_to_check;
658 case SLSB_P_OUTPUT_EMPTY:
659 /* the adapter got it */
660 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %3d", q->nr, count);
662 atomic_sub(count, &q->nr_buf_used);
663 q->first_to_check = add_buf(q->first_to_check, count);
665 * We fetch all buffer states at once. get_buf_states may
666 * return count < stop. For QEBSM we do not loop.
671 case SLSB_P_OUTPUT_ERROR:
672 announce_buffer_error(q, count);
673 /* process the buffer, the upper layer will take care of it */
674 q->first_to_check = add_buf(q->first_to_check, count);
675 atomic_sub(count, &q->nr_buf_used);
677 case SLSB_CU_OUTPUT_PRIMED:
678 /* the adapter has not fetched the output yet */
679 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
681 case SLSB_P_OUTPUT_NOT_INIT:
682 case SLSB_P_OUTPUT_HALTED:
687 return q->first_to_check;
690 /* all buffers processed? */
691 static inline int qdio_outbound_q_done(struct qdio_q *q)
693 return atomic_read(&q->nr_buf_used) == 0;
696 static inline int qdio_outbound_q_moved(struct qdio_q *q)
700 bufnr = get_outbound_buffer_frontier(q);
702 if ((bufnr != q->last_move) || q->qdio_error) {
703 q->last_move = bufnr;
704 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
710 static int qdio_kick_outbound_q(struct qdio_q *q)
712 unsigned int busy_bit;
715 if (!need_siga_out(q))
718 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
719 qdio_perf_stat_inc(&perf_stats.siga_out);
721 cc = qdio_siga_output(q, &busy_bit);
727 DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
728 cc |= QDIO_ERROR_SIGA_BUSY;
730 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
734 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
740 static void __qdio_outbound_processing(struct qdio_q *q)
742 qdio_perf_stat_inc(&perf_stats.tasklet_outbound);
743 BUG_ON(atomic_read(&q->nr_buf_used) < 0);
745 if (qdio_outbound_q_moved(q))
746 qdio_kick_handler(q);
748 if (queue_type(q) == QDIO_ZFCP_QFMT)
749 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
752 /* bail out for HiperSockets unicast queues */
753 if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
756 if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
757 (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
760 if (q->u.out.pci_out_enabled)
764 * Now we know that queue type is either qeth without pci enabled
765 * or HiperSockets multicast. Make sure buffer switch from PRIMED to
766 * EMPTY is noticed and outbound_handler is called after some time.
768 if (qdio_outbound_q_done(q))
769 del_timer(&q->u.out.timer);
771 if (!timer_pending(&q->u.out.timer)) {
772 mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
773 qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer);
779 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
781 tasklet_schedule(&q->tasklet);
784 /* outbound tasklet */
785 void qdio_outbound_processing(unsigned long data)
787 struct qdio_q *q = (struct qdio_q *)data;
788 __qdio_outbound_processing(q);
791 void qdio_outbound_timer(unsigned long data)
793 struct qdio_q *q = (struct qdio_q *)data;
795 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
797 tasklet_schedule(&q->tasklet);
800 /* called from thinint inbound tasklet */
801 void qdio_check_outbound_after_thinint(struct qdio_q *q)
806 if (!pci_out_supported(q))
809 for_each_output_queue(q->irq_ptr, out, i)
810 if (!qdio_outbound_q_done(out))
811 tasklet_schedule(&out->tasklet);
814 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
815 enum qdio_irq_states state)
817 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
819 irq_ptr->state = state;
823 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
825 if (irb->esw.esw0.erw.cons) {
826 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
827 DBF_ERROR_HEX(irb, 64);
828 DBF_ERROR_HEX(irb->ecw, 64);
832 /* PCI interrupt handler */
833 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
838 if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
841 qdio_perf_stat_inc(&perf_stats.pci_int);
843 for_each_input_queue(irq_ptr, q, i)
844 tasklet_schedule(&q->tasklet);
846 if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
849 for_each_output_queue(irq_ptr, q, i) {
850 if (qdio_outbound_q_done(q))
853 if (!siga_syncs_out_pci(q))
856 tasklet_schedule(&q->tasklet);
860 static void qdio_handle_activate_check(struct ccw_device *cdev,
861 unsigned long intparm, int cstat, int dstat)
863 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
866 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
867 DBF_ERROR("intp :%lx", intparm);
868 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
870 if (irq_ptr->nr_input_qs) {
871 q = irq_ptr->input_qs[0];
872 } else if (irq_ptr->nr_output_qs) {
873 q = irq_ptr->output_qs[0];
878 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
879 0, -1, -1, irq_ptr->int_parm);
881 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
884 static void qdio_call_shutdown(struct work_struct *work)
886 struct ccw_device_private *priv;
887 struct ccw_device *cdev;
889 priv = container_of(work, struct ccw_device_private, kick_work);
891 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
892 put_device(&cdev->dev);
895 static void qdio_int_error(struct ccw_device *cdev)
897 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
899 switch (irq_ptr->state) {
900 case QDIO_IRQ_STATE_INACTIVE:
901 case QDIO_IRQ_STATE_CLEANUP:
902 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
904 case QDIO_IRQ_STATE_ESTABLISHED:
905 case QDIO_IRQ_STATE_ACTIVE:
906 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
907 if (get_device(&cdev->dev)) {
908 /* Can't call shutdown from interrupt context. */
909 PREPARE_WORK(&cdev->private->kick_work,
911 queue_work(ccw_device_work, &cdev->private->kick_work);
917 wake_up(&cdev->private->wait_q);
920 static int qdio_establish_check_errors(struct ccw_device *cdev, int cstat,
923 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
925 if (cstat || (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END))) {
926 DBF_ERROR("EQ:ck con");
930 if (!(dstat & DEV_STAT_DEV_END)) {
931 DBF_ERROR("EQ:no dev");
935 if (dstat & ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) {
936 DBF_ERROR("EQ: bad io");
941 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
942 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
944 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
948 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
951 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
953 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
954 if (!qdio_establish_check_errors(cdev, cstat, dstat))
955 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
958 /* qdio interrupt handler */
959 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
962 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
965 qdio_perf_stat_inc(&perf_stats.qdio_int);
967 if (!intparm || !irq_ptr) {
968 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
973 switch (PTR_ERR(irb)) {
975 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
978 DBF_ERROR("%4x IO timeout", irq_ptr->schid.sch_no);
979 qdio_int_error(cdev);
986 qdio_irq_check_sense(irq_ptr, irb);
988 cstat = irb->scsw.cmd.cstat;
989 dstat = irb->scsw.cmd.dstat;
991 switch (irq_ptr->state) {
992 case QDIO_IRQ_STATE_INACTIVE:
993 qdio_establish_handle_irq(cdev, cstat, dstat);
996 case QDIO_IRQ_STATE_CLEANUP:
997 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1000 case QDIO_IRQ_STATE_ESTABLISHED:
1001 case QDIO_IRQ_STATE_ACTIVE:
1002 if (cstat & SCHN_STAT_PCI) {
1003 qdio_int_handler_pci(irq_ptr);
1004 /* no state change so no need to wake up wait_q */
1007 if ((cstat & ~SCHN_STAT_PCI) || dstat) {
1008 qdio_handle_activate_check(cdev, intparm, cstat,
1015 wake_up(&cdev->private->wait_q);
1019 * qdio_get_ssqd_desc - get qdio subchannel description
1020 * @cdev: ccw device to get description for
1021 * @data: where to store the ssqd
1023 * Returns 0 or an error code. The results of the chsc are stored in the
1024 * specified structure.
1026 int qdio_get_ssqd_desc(struct ccw_device *cdev,
1027 struct qdio_ssqd_desc *data)
1030 if (!cdev || !cdev->private)
1033 DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
1034 return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
1036 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
1039 * qdio_cleanup - shutdown queues and free data structures
1040 * @cdev: associated ccw device
1041 * @how: use halt or clear to shutdown
1043 * This function calls qdio_shutdown() for @cdev with method @how.
1044 * and qdio_free(). The qdio_free() return value is ignored since
1045 * !irq_ptr is already checked.
1047 int qdio_cleanup(struct ccw_device *cdev, int how)
1049 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1055 rc = qdio_shutdown(cdev, how);
1060 EXPORT_SYMBOL_GPL(qdio_cleanup);
1062 static void qdio_shutdown_queues(struct ccw_device *cdev)
1064 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1068 for_each_input_queue(irq_ptr, q, i)
1069 tasklet_kill(&q->tasklet);
1071 for_each_output_queue(irq_ptr, q, i) {
1072 del_timer(&q->u.out.timer);
1073 tasklet_kill(&q->tasklet);
1078 * qdio_shutdown - shut down a qdio subchannel
1079 * @cdev: associated ccw device
1080 * @how: use halt or clear to shutdown
1082 int qdio_shutdown(struct ccw_device *cdev, int how)
1084 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1086 unsigned long flags;
1091 BUG_ON(irqs_disabled());
1092 DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1094 mutex_lock(&irq_ptr->setup_mutex);
1096 * Subchannel was already shot down. We cannot prevent being called
1097 * twice since cio may trigger a shutdown asynchronously.
1099 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1100 mutex_unlock(&irq_ptr->setup_mutex);
1105 * Indicate that the device is going down. Scheduling the queue
1106 * tasklets is forbidden from here on.
1108 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1110 tiqdio_remove_input_queues(irq_ptr);
1111 qdio_shutdown_queues(cdev);
1112 qdio_shutdown_debug_entries(irq_ptr, cdev);
1114 /* cleanup subchannel */
1115 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1117 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1118 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1120 /* default behaviour is halt */
1121 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1123 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1124 DBF_ERROR("rc:%4d", rc);
1128 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1129 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1130 wait_event_interruptible_timeout(cdev->private->wait_q,
1131 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1132 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1134 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1137 qdio_shutdown_thinint(irq_ptr);
1139 /* restore interrupt handler */
1140 if ((void *)cdev->handler == (void *)qdio_int_handler)
1141 cdev->handler = irq_ptr->orig_handler;
1142 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1144 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1145 mutex_unlock(&irq_ptr->setup_mutex);
1150 EXPORT_SYMBOL_GPL(qdio_shutdown);
1153 * qdio_free - free data structures for a qdio subchannel
1154 * @cdev: associated ccw device
1156 int qdio_free(struct ccw_device *cdev)
1158 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1163 DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1164 mutex_lock(&irq_ptr->setup_mutex);
1166 if (irq_ptr->debug_area != NULL) {
1167 debug_unregister(irq_ptr->debug_area);
1168 irq_ptr->debug_area = NULL;
1170 cdev->private->qdio_data = NULL;
1171 mutex_unlock(&irq_ptr->setup_mutex);
1173 qdio_release_memory(irq_ptr);
1176 EXPORT_SYMBOL_GPL(qdio_free);
1179 * qdio_initialize - allocate and establish queues for a qdio subchannel
1180 * @init_data: initialization data
1182 * This function first allocates queues via qdio_allocate() and on success
1183 * establishes them via qdio_establish().
1185 int qdio_initialize(struct qdio_initialize *init_data)
1189 rc = qdio_allocate(init_data);
1193 rc = qdio_establish(init_data);
1195 qdio_free(init_data->cdev);
1198 EXPORT_SYMBOL_GPL(qdio_initialize);
1201 * qdio_allocate - allocate qdio queues and associated data
1202 * @init_data: initialization data
1204 int qdio_allocate(struct qdio_initialize *init_data)
1206 struct qdio_irq *irq_ptr;
1208 DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1210 if ((init_data->no_input_qs && !init_data->input_handler) ||
1211 (init_data->no_output_qs && !init_data->output_handler))
1214 if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1215 (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1218 if ((!init_data->input_sbal_addr_array) ||
1219 (!init_data->output_sbal_addr_array))
1222 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1223 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1227 mutex_init(&irq_ptr->setup_mutex);
1228 qdio_allocate_dbf(init_data, irq_ptr);
1231 * Allocate a page for the chsc calls in qdio_establish.
1232 * Must be pre-allocated since a zfcp recovery will call
1233 * qdio_establish. In case of low memory and swap on a zfcp disk
1234 * we may not be able to allocate memory otherwise.
1236 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1237 if (!irq_ptr->chsc_page)
1240 /* qdr is used in ccw1.cda which is u32 */
1241 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1244 WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1246 if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1247 init_data->no_output_qs))
1250 init_data->cdev->private->qdio_data = irq_ptr;
1251 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1254 qdio_release_memory(irq_ptr);
1258 EXPORT_SYMBOL_GPL(qdio_allocate);
1261 * qdio_establish - establish queues on a qdio subchannel
1262 * @init_data: initialization data
1264 int qdio_establish(struct qdio_initialize *init_data)
1266 struct qdio_irq *irq_ptr;
1267 struct ccw_device *cdev = init_data->cdev;
1268 unsigned long saveflags;
1271 DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1273 irq_ptr = cdev->private->qdio_data;
1277 if (cdev->private->state != DEV_STATE_ONLINE)
1280 mutex_lock(&irq_ptr->setup_mutex);
1281 qdio_setup_irq(init_data);
1283 rc = qdio_establish_thinint(irq_ptr);
1285 mutex_unlock(&irq_ptr->setup_mutex);
1286 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1291 irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1292 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1293 irq_ptr->ccw.count = irq_ptr->equeue.count;
1294 irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1296 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1297 ccw_device_set_options_mask(cdev, 0);
1299 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1301 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1302 DBF_ERROR("rc:%4x", rc);
1304 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1307 mutex_unlock(&irq_ptr->setup_mutex);
1308 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1312 wait_event_interruptible_timeout(cdev->private->wait_q,
1313 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1314 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1316 if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1317 mutex_unlock(&irq_ptr->setup_mutex);
1318 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1322 qdio_setup_ssqd_info(irq_ptr);
1323 DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1324 DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1326 /* qebsm is now setup if available, initialize buffer states */
1327 qdio_init_buf_states(irq_ptr);
1329 mutex_unlock(&irq_ptr->setup_mutex);
1330 qdio_print_subchannel_info(irq_ptr, cdev);
1331 qdio_setup_debug_entries(irq_ptr, cdev);
1334 EXPORT_SYMBOL_GPL(qdio_establish);
1337 * qdio_activate - activate queues on a qdio subchannel
1338 * @cdev: associated cdev
1340 int qdio_activate(struct ccw_device *cdev)
1342 struct qdio_irq *irq_ptr;
1344 unsigned long saveflags;
1346 DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1348 irq_ptr = cdev->private->qdio_data;
1352 if (cdev->private->state != DEV_STATE_ONLINE)
1355 mutex_lock(&irq_ptr->setup_mutex);
1356 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1361 irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1362 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1363 irq_ptr->ccw.count = irq_ptr->aqueue.count;
1364 irq_ptr->ccw.cda = 0;
1366 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1367 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1369 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1370 0, DOIO_DENY_PREFETCH);
1372 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1373 DBF_ERROR("rc:%4x", rc);
1375 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1380 if (is_thinint_irq(irq_ptr))
1381 tiqdio_add_input_queues(irq_ptr);
1383 /* wait for subchannel to become active */
1386 switch (irq_ptr->state) {
1387 case QDIO_IRQ_STATE_STOPPED:
1388 case QDIO_IRQ_STATE_ERR:
1392 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1396 mutex_unlock(&irq_ptr->setup_mutex);
1399 EXPORT_SYMBOL_GPL(qdio_activate);
1401 static inline int buf_in_between(int bufnr, int start, int count)
1403 int end = add_buf(start, count);
1406 if (bufnr >= start && bufnr < end)
1412 /* wrap-around case */
1413 if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1421 * handle_inbound - reset processed input buffers
1422 * @q: queue containing the buffers
1424 * @bufnr: first buffer to process
1425 * @count: how many buffers are emptied
1427 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1428 int bufnr, int count)
1432 if (!q->u.in.polling)
1435 /* protect against stop polling setting an ACK for an emptied slsb */
1436 if (count == QDIO_MAX_BUFFERS_PER_Q) {
1437 /* overwriting everything, just delete polling status */
1438 q->u.in.polling = 0;
1439 q->u.in.ack_count = 0;
1441 } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1443 /* partial overwrite, just update ack_start */
1444 diff = add_buf(bufnr, count);
1445 diff = sub_buf(diff, q->u.in.ack_start);
1446 q->u.in.ack_count -= diff;
1447 if (q->u.in.ack_count <= 0) {
1448 q->u.in.polling = 0;
1449 q->u.in.ack_count = 0;
1452 q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1455 /* the only ACK will be deleted, so stop polling */
1456 q->u.in.polling = 0;
1460 count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1462 used = atomic_add_return(count, &q->nr_buf_used) - count;
1463 BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1465 /* no need to signal as long as the adapter had free buffers */
1469 if (need_siga_in(q))
1470 return qdio_siga_input(q);
1475 * handle_outbound - process filled outbound buffers
1476 * @q: queue containing the buffers
1478 * @bufnr: first buffer to process
1479 * @count: how many buffers are filled
1481 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1482 int bufnr, int count)
1484 unsigned char state;
1487 qdio_perf_stat_inc(&perf_stats.outbound_handler);
1489 count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1490 used = atomic_add_return(count, &q->nr_buf_used);
1491 BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1493 if (callflags & QDIO_FLAG_PCI_OUT)
1494 q->u.out.pci_out_enabled = 1;
1496 q->u.out.pci_out_enabled = 0;
1498 if (queue_type(q) == QDIO_IQDIO_QFMT) {
1499 if (multicast_outbound(q))
1500 rc = qdio_kick_outbound_q(q);
1502 if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1504 (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1505 /* exploit enhanced SIGA */
1506 q->u.out.use_enh_siga = 1;
1507 rc = qdio_kick_outbound_q(q);
1510 * One siga-w per buffer required for unicast
1513 q->u.out.use_enh_siga = 0;
1515 rc = qdio_kick_outbound_q(q);
1523 if (need_siga_sync(q)) {
1524 qdio_siga_sync_q(q);
1528 /* try to fast requeue buffers */
1529 get_buf_state(q, prev_buf(bufnr), &state, 0);
1530 if (state != SLSB_CU_OUTPUT_PRIMED)
1531 rc = qdio_kick_outbound_q(q);
1533 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "fast-req");
1534 qdio_perf_stat_inc(&perf_stats.fast_requeue);
1537 tasklet_schedule(&q->tasklet);
1542 * do_QDIO - process input or output buffers
1543 * @cdev: associated ccw_device for the qdio subchannel
1544 * @callflags: input or output and special flags from the program
1545 * @q_nr: queue number
1546 * @bufnr: buffer number
1547 * @count: how many buffers to process
1549 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1550 int q_nr, int bufnr, int count)
1552 struct qdio_irq *irq_ptr;
1554 if ((bufnr > QDIO_MAX_BUFFERS_PER_Q) ||
1555 (count > QDIO_MAX_BUFFERS_PER_Q) ||
1556 (q_nr > QDIO_MAX_QUEUES_PER_IRQ))
1562 irq_ptr = cdev->private->qdio_data;
1566 if (callflags & QDIO_FLAG_SYNC_INPUT)
1567 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO input");
1569 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO output");
1570 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "q:%1d flag:%4x", q_nr, callflags);
1571 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "buf:%2d cnt:%3d", bufnr, count);
1573 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1576 if (callflags & QDIO_FLAG_SYNC_INPUT)
1577 return handle_inbound(irq_ptr->input_qs[q_nr],
1578 callflags, bufnr, count);
1579 else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1580 return handle_outbound(irq_ptr->output_qs[q_nr],
1581 callflags, bufnr, count);
1584 EXPORT_SYMBOL_GPL(do_QDIO);
1586 static int __init init_QDIO(void)
1590 rc = qdio_setup_init();
1593 rc = tiqdio_allocate_memory();
1596 rc = qdio_debug_init();
1599 rc = qdio_setup_perf_stats();
1602 rc = tiqdio_register_thinints();
1608 qdio_remove_perf_stats();
1612 tiqdio_free_memory();
1618 static void __exit exit_QDIO(void)
1620 tiqdio_unregister_thinints();
1621 tiqdio_free_memory();
1622 qdio_remove_perf_stats();
1627 module_init(init_QDIO);
1628 module_exit(exit_QDIO);