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 static 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 inline 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 static 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 static inline void qdio_sync_after_thinint(struct qdio_q *q)
363 if (pci_out_supported(q)) {
364 if (need_siga_sync_thinint(q))
365 qdio_siga_sync_all(q);
366 else if (need_siga_sync_out_thinint(q))
367 qdio_siga_sync_out(q);
372 int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
373 unsigned char *state)
376 return get_buf_states(q, bufnr, state, 1, 0);
379 static inline void qdio_stop_polling(struct qdio_q *q)
381 if (!q->u.in.polling)
385 qdio_perf_stat_inc(&perf_stats.debug_stop_polling);
387 /* show the card that we are not polling anymore */
389 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
391 q->u.in.ack_count = 0;
393 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
396 static void announce_buffer_error(struct qdio_q *q, int count)
398 q->qdio_error |= QDIO_ERROR_SLSB_STATE;
400 /* special handling for no target buffer empty */
401 if ((!q->is_input_q &&
402 (q->sbal[q->first_to_check]->element[15].flags & 0xff) == 0x10)) {
403 qdio_perf_stat_inc(&perf_stats.outbound_target_full);
404 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%3d",
409 DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
410 DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
411 DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
412 DBF_ERROR("F14:%2x F15:%2x",
413 q->sbal[q->first_to_check]->element[14].flags & 0xff,
414 q->sbal[q->first_to_check]->element[15].flags & 0xff);
417 static inline void inbound_primed(struct qdio_q *q, int count)
421 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %3d", count);
423 /* for QEBSM the ACK was already set by EQBS */
425 if (!q->u.in.polling) {
427 q->u.in.ack_count = count;
428 q->u.in.ack_start = q->first_to_check;
432 /* delete the previous ACK's */
433 set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
435 q->u.in.ack_count = count;
436 q->u.in.ack_start = q->first_to_check;
441 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
442 * or by the next inbound run.
444 new = add_buf(q->first_to_check, count - 1);
445 if (q->u.in.polling) {
446 /* reset the previous ACK but first set the new one */
447 set_buf_state(q, new, SLSB_P_INPUT_ACK);
448 set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
451 set_buf_state(q, new, SLSB_P_INPUT_ACK);
454 q->u.in.ack_start = new;
460 * Need to change all PRIMED buffers to NOT_INIT, otherwise
461 * we're loosing initiative in the thinint code.
463 set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT,
467 static int get_inbound_buffer_frontier(struct qdio_q *q)
473 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
476 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
477 stop = add_buf(q->first_to_check, count);
479 if (q->first_to_check == stop)
483 * No siga sync here, as a PCI or we after a thin interrupt
484 * already sync'ed the queues.
486 count = get_buf_states(q, q->first_to_check, &state, count, 1);
491 case SLSB_P_INPUT_PRIMED:
492 inbound_primed(q, count);
493 q->first_to_check = add_buf(q->first_to_check, count);
494 atomic_sub(count, &q->nr_buf_used);
496 case SLSB_P_INPUT_ERROR:
497 announce_buffer_error(q, count);
498 /* process the buffer, the upper layer will take care of it */
499 q->first_to_check = add_buf(q->first_to_check, count);
500 atomic_sub(count, &q->nr_buf_used);
502 case SLSB_CU_INPUT_EMPTY:
503 case SLSB_P_INPUT_NOT_INIT:
504 case SLSB_P_INPUT_ACK:
505 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
511 return q->first_to_check;
514 static int qdio_inbound_q_moved(struct qdio_q *q)
518 bufnr = get_inbound_buffer_frontier(q);
520 if ((bufnr != q->last_move) || q->qdio_error) {
521 q->last_move = bufnr;
522 if (!is_thinint_irq(q->irq_ptr) && !MACHINE_IS_VM)
523 q->u.in.timestamp = get_usecs();
529 static inline int qdio_inbound_q_done(struct qdio_q *q)
531 unsigned char state = 0;
533 if (!atomic_read(&q->nr_buf_used))
537 get_buf_state(q, q->first_to_check, &state, 0);
539 if (state == SLSB_P_INPUT_PRIMED)
540 /* more work coming */
543 if (is_thinint_irq(q->irq_ptr))
546 /* don't poll under z/VM */
551 * At this point we know, that inbound first_to_check
552 * has (probably) not moved (see qdio_inbound_processing).
554 if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
555 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%3d",
562 static void qdio_kick_handler(struct qdio_q *q)
564 int start = q->first_to_kick;
565 int end = q->first_to_check;
568 if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
571 count = sub_buf(end, start);
574 qdio_perf_stat_inc(&perf_stats.inbound_handler);
575 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%3d c:%3d", start, count);
577 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: nr:%1d", q->nr);
578 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "s:%3d c:%3d", start, count);
581 q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
582 q->irq_ptr->int_parm);
584 /* for the next time */
585 q->first_to_kick = end;
589 static void __qdio_inbound_processing(struct qdio_q *q)
591 qdio_perf_stat_inc(&perf_stats.tasklet_inbound);
593 if (!qdio_inbound_q_moved(q))
596 qdio_kick_handler(q);
598 if (!qdio_inbound_q_done(q))
599 /* means poll time is not yet over */
602 qdio_stop_polling(q);
604 * We need to check again to not lose initiative after
605 * resetting the ACK state.
607 if (!qdio_inbound_q_done(q))
611 void qdio_inbound_processing(unsigned long data)
613 struct qdio_q *q = (struct qdio_q *)data;
614 __qdio_inbound_processing(q);
617 static int get_outbound_buffer_frontier(struct qdio_q *q)
622 if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
623 (queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
627 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
630 count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
631 stop = add_buf(q->first_to_check, count);
633 if (q->first_to_check == stop)
634 return q->first_to_check;
636 count = get_buf_states(q, q->first_to_check, &state, count, 0);
638 return q->first_to_check;
641 case SLSB_P_OUTPUT_EMPTY:
642 /* the adapter got it */
643 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out empty:%1d %3d", q->nr, count);
645 atomic_sub(count, &q->nr_buf_used);
646 q->first_to_check = add_buf(q->first_to_check, count);
648 case SLSB_P_OUTPUT_ERROR:
649 announce_buffer_error(q, count);
650 /* process the buffer, the upper layer will take care of it */
651 q->first_to_check = add_buf(q->first_to_check, count);
652 atomic_sub(count, &q->nr_buf_used);
654 case SLSB_CU_OUTPUT_PRIMED:
655 /* the adapter has not fetched the output yet */
656 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d", q->nr);
658 case SLSB_P_OUTPUT_NOT_INIT:
659 case SLSB_P_OUTPUT_HALTED:
664 return q->first_to_check;
667 /* all buffers processed? */
668 static inline int qdio_outbound_q_done(struct qdio_q *q)
670 return atomic_read(&q->nr_buf_used) == 0;
673 static inline int qdio_outbound_q_moved(struct qdio_q *q)
677 bufnr = get_outbound_buffer_frontier(q);
679 if ((bufnr != q->last_move) || q->qdio_error) {
680 q->last_move = bufnr;
681 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
687 static int qdio_kick_outbound_q(struct qdio_q *q)
689 unsigned int busy_bit;
692 if (!need_siga_out(q))
695 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
696 qdio_perf_stat_inc(&perf_stats.siga_out);
698 cc = qdio_siga_output(q, &busy_bit);
704 DBF_ERROR("%4x cc2 REP:%1d", SCH_NO(q), q->nr);
705 cc |= QDIO_ERROR_SIGA_BUSY;
707 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
711 DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
717 static void __qdio_outbound_processing(struct qdio_q *q)
719 qdio_perf_stat_inc(&perf_stats.tasklet_outbound);
720 BUG_ON(atomic_read(&q->nr_buf_used) < 0);
722 if (qdio_outbound_q_moved(q))
723 qdio_kick_handler(q);
725 if (queue_type(q) == QDIO_ZFCP_QFMT)
726 if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
729 /* bail out for HiperSockets unicast queues */
730 if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q))
733 if ((queue_type(q) == QDIO_IQDIO_QFMT) &&
734 (atomic_read(&q->nr_buf_used)) > QDIO_IQDIO_POLL_LVL)
737 if (q->u.out.pci_out_enabled)
741 * Now we know that queue type is either qeth without pci enabled
742 * or HiperSockets multicast. Make sure buffer switch from PRIMED to
743 * EMPTY is noticed and outbound_handler is called after some time.
745 if (qdio_outbound_q_done(q))
746 del_timer(&q->u.out.timer);
748 if (!timer_pending(&q->u.out.timer)) {
749 mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
750 qdio_perf_stat_inc(&perf_stats.debug_tl_out_timer);
756 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
758 tasklet_schedule(&q->tasklet);
761 /* outbound tasklet */
762 void qdio_outbound_processing(unsigned long data)
764 struct qdio_q *q = (struct qdio_q *)data;
765 __qdio_outbound_processing(q);
768 void qdio_outbound_timer(unsigned long data)
770 struct qdio_q *q = (struct qdio_q *)data;
772 if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
774 tasklet_schedule(&q->tasklet);
777 static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
782 if (!pci_out_supported(q))
785 for_each_output_queue(q->irq_ptr, out, i)
786 if (!qdio_outbound_q_done(out))
787 tasklet_schedule(&out->tasklet);
790 static void __tiqdio_inbound_processing(struct qdio_q *q)
792 qdio_perf_stat_inc(&perf_stats.thinint_inbound);
793 qdio_sync_after_thinint(q);
796 * The interrupt could be caused by a PCI request. Check the
797 * PCI capable outbound queues.
799 qdio_check_outbound_after_thinint(q);
801 if (!qdio_inbound_q_moved(q))
804 qdio_kick_handler(q);
806 if (!qdio_inbound_q_done(q)) {
807 qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop);
808 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
809 tasklet_schedule(&q->tasklet);
812 qdio_stop_polling(q);
814 * We need to check again to not lose initiative after
815 * resetting the ACK state.
817 if (!qdio_inbound_q_done(q)) {
818 qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop2);
819 if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
820 tasklet_schedule(&q->tasklet);
824 void tiqdio_inbound_processing(unsigned long data)
826 struct qdio_q *q = (struct qdio_q *)data;
827 __tiqdio_inbound_processing(q);
830 static inline void qdio_set_state(struct qdio_irq *irq_ptr,
831 enum qdio_irq_states state)
833 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
835 irq_ptr->state = state;
839 static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
841 if (irb->esw.esw0.erw.cons) {
842 DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
843 DBF_ERROR_HEX(irb, 64);
844 DBF_ERROR_HEX(irb->ecw, 64);
848 /* PCI interrupt handler */
849 static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
854 if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
857 qdio_perf_stat_inc(&perf_stats.pci_int);
859 for_each_input_queue(irq_ptr, q, i)
860 tasklet_schedule(&q->tasklet);
862 if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
865 for_each_output_queue(irq_ptr, q, i) {
866 if (qdio_outbound_q_done(q))
869 if (!siga_syncs_out_pci(q))
872 tasklet_schedule(&q->tasklet);
876 static void qdio_handle_activate_check(struct ccw_device *cdev,
877 unsigned long intparm, int cstat, int dstat)
879 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
882 DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
883 DBF_ERROR("intp :%lx", intparm);
884 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
886 if (irq_ptr->nr_input_qs) {
887 q = irq_ptr->input_qs[0];
888 } else if (irq_ptr->nr_output_qs) {
889 q = irq_ptr->output_qs[0];
894 q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
895 0, -1, -1, irq_ptr->int_parm);
897 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
900 static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
903 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
905 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
909 if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
911 if (!(dstat & DEV_STAT_DEV_END))
913 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
917 DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
918 DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
919 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
922 /* qdio interrupt handler */
923 void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
926 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
929 qdio_perf_stat_inc(&perf_stats.qdio_int);
931 if (!intparm || !irq_ptr) {
932 DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
937 switch (PTR_ERR(irb)) {
939 DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
940 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
941 wake_up(&cdev->private->wait_q);
948 qdio_irq_check_sense(irq_ptr, irb);
949 cstat = irb->scsw.cmd.cstat;
950 dstat = irb->scsw.cmd.dstat;
952 switch (irq_ptr->state) {
953 case QDIO_IRQ_STATE_INACTIVE:
954 qdio_establish_handle_irq(cdev, cstat, dstat);
956 case QDIO_IRQ_STATE_CLEANUP:
957 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
959 case QDIO_IRQ_STATE_ESTABLISHED:
960 case QDIO_IRQ_STATE_ACTIVE:
961 if (cstat & SCHN_STAT_PCI) {
962 qdio_int_handler_pci(irq_ptr);
966 qdio_handle_activate_check(cdev, intparm, cstat,
972 wake_up(&cdev->private->wait_q);
976 * qdio_get_ssqd_desc - get qdio subchannel description
977 * @cdev: ccw device to get description for
978 * @data: where to store the ssqd
980 * Returns 0 or an error code. The results of the chsc are stored in the
981 * specified structure.
983 int qdio_get_ssqd_desc(struct ccw_device *cdev,
984 struct qdio_ssqd_desc *data)
987 if (!cdev || !cdev->private)
990 DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
991 return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
993 EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
996 * qdio_cleanup - shutdown queues and free data structures
997 * @cdev: associated ccw device
998 * @how: use halt or clear to shutdown
1000 * This function calls qdio_shutdown() for @cdev with method @how.
1001 * and qdio_free(). The qdio_free() return value is ignored since
1002 * !irq_ptr is already checked.
1004 int qdio_cleanup(struct ccw_device *cdev, int how)
1006 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1012 rc = qdio_shutdown(cdev, how);
1017 EXPORT_SYMBOL_GPL(qdio_cleanup);
1019 static void qdio_shutdown_queues(struct ccw_device *cdev)
1021 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1025 for_each_input_queue(irq_ptr, q, i)
1026 tasklet_kill(&q->tasklet);
1028 for_each_output_queue(irq_ptr, q, i) {
1029 del_timer(&q->u.out.timer);
1030 tasklet_kill(&q->tasklet);
1035 * qdio_shutdown - shut down a qdio subchannel
1036 * @cdev: associated ccw device
1037 * @how: use halt or clear to shutdown
1039 int qdio_shutdown(struct ccw_device *cdev, int how)
1041 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1043 unsigned long flags;
1048 BUG_ON(irqs_disabled());
1049 DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
1051 mutex_lock(&irq_ptr->setup_mutex);
1053 * Subchannel was already shot down. We cannot prevent being called
1054 * twice since cio may trigger a shutdown asynchronously.
1056 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1057 mutex_unlock(&irq_ptr->setup_mutex);
1062 * Indicate that the device is going down. Scheduling the queue
1063 * tasklets is forbidden from here on.
1065 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
1067 tiqdio_remove_input_queues(irq_ptr);
1068 qdio_shutdown_queues(cdev);
1069 qdio_shutdown_debug_entries(irq_ptr, cdev);
1071 /* cleanup subchannel */
1072 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1074 if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
1075 rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
1077 /* default behaviour is halt */
1078 rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
1080 DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
1081 DBF_ERROR("rc:%4d", rc);
1085 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
1086 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1087 wait_event_interruptible_timeout(cdev->private->wait_q,
1088 irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
1089 irq_ptr->state == QDIO_IRQ_STATE_ERR,
1091 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
1094 qdio_shutdown_thinint(irq_ptr);
1096 /* restore interrupt handler */
1097 if ((void *)cdev->handler == (void *)qdio_int_handler)
1098 cdev->handler = irq_ptr->orig_handler;
1099 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1101 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1102 mutex_unlock(&irq_ptr->setup_mutex);
1107 EXPORT_SYMBOL_GPL(qdio_shutdown);
1110 * qdio_free - free data structures for a qdio subchannel
1111 * @cdev: associated ccw device
1113 int qdio_free(struct ccw_device *cdev)
1115 struct qdio_irq *irq_ptr = cdev->private->qdio_data;
1120 DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
1121 mutex_lock(&irq_ptr->setup_mutex);
1123 if (irq_ptr->debug_area != NULL) {
1124 debug_unregister(irq_ptr->debug_area);
1125 irq_ptr->debug_area = NULL;
1127 cdev->private->qdio_data = NULL;
1128 mutex_unlock(&irq_ptr->setup_mutex);
1130 qdio_release_memory(irq_ptr);
1133 EXPORT_SYMBOL_GPL(qdio_free);
1136 * qdio_initialize - allocate and establish queues for a qdio subchannel
1137 * @init_data: initialization data
1139 * This function first allocates queues via qdio_allocate() and on success
1140 * establishes them via qdio_establish().
1142 int qdio_initialize(struct qdio_initialize *init_data)
1146 rc = qdio_allocate(init_data);
1150 rc = qdio_establish(init_data);
1152 qdio_free(init_data->cdev);
1155 EXPORT_SYMBOL_GPL(qdio_initialize);
1158 * qdio_allocate - allocate qdio queues and associated data
1159 * @init_data: initialization data
1161 int qdio_allocate(struct qdio_initialize *init_data)
1163 struct qdio_irq *irq_ptr;
1165 DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
1167 if ((init_data->no_input_qs && !init_data->input_handler) ||
1168 (init_data->no_output_qs && !init_data->output_handler))
1171 if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
1172 (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
1175 if ((!init_data->input_sbal_addr_array) ||
1176 (!init_data->output_sbal_addr_array))
1179 /* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
1180 irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1184 mutex_init(&irq_ptr->setup_mutex);
1185 qdio_allocate_dbf(init_data, irq_ptr);
1188 * Allocate a page for the chsc calls in qdio_establish.
1189 * Must be pre-allocated since a zfcp recovery will call
1190 * qdio_establish. In case of low memory and swap on a zfcp disk
1191 * we may not be able to allocate memory otherwise.
1193 irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
1194 if (!irq_ptr->chsc_page)
1197 /* qdr is used in ccw1.cda which is u32 */
1198 irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1201 WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
1203 if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
1204 init_data->no_output_qs))
1207 init_data->cdev->private->qdio_data = irq_ptr;
1208 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
1211 qdio_release_memory(irq_ptr);
1215 EXPORT_SYMBOL_GPL(qdio_allocate);
1218 * qdio_establish - establish queues on a qdio subchannel
1219 * @init_data: initialization data
1221 int qdio_establish(struct qdio_initialize *init_data)
1223 struct qdio_irq *irq_ptr;
1224 struct ccw_device *cdev = init_data->cdev;
1225 unsigned long saveflags;
1228 DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
1230 irq_ptr = cdev->private->qdio_data;
1234 if (cdev->private->state != DEV_STATE_ONLINE)
1237 mutex_lock(&irq_ptr->setup_mutex);
1238 qdio_setup_irq(init_data);
1240 rc = qdio_establish_thinint(irq_ptr);
1242 mutex_unlock(&irq_ptr->setup_mutex);
1243 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1248 irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
1249 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1250 irq_ptr->ccw.count = irq_ptr->equeue.count;
1251 irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
1253 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1254 ccw_device_set_options_mask(cdev, 0);
1256 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
1258 DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
1259 DBF_ERROR("rc:%4x", rc);
1261 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1264 mutex_unlock(&irq_ptr->setup_mutex);
1265 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1269 wait_event_interruptible_timeout(cdev->private->wait_q,
1270 irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
1271 irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
1273 if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
1274 mutex_unlock(&irq_ptr->setup_mutex);
1275 qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
1279 qdio_setup_ssqd_info(irq_ptr);
1280 DBF_EVENT("qDmmwc:%2x", irq_ptr->ssqd_desc.mmwc);
1281 DBF_EVENT("qib ac:%4x", irq_ptr->qib.ac);
1283 /* qebsm is now setup if available, initialize buffer states */
1284 qdio_init_buf_states(irq_ptr);
1286 mutex_unlock(&irq_ptr->setup_mutex);
1287 qdio_print_subchannel_info(irq_ptr, cdev);
1288 qdio_setup_debug_entries(irq_ptr, cdev);
1291 EXPORT_SYMBOL_GPL(qdio_establish);
1294 * qdio_activate - activate queues on a qdio subchannel
1295 * @cdev: associated cdev
1297 int qdio_activate(struct ccw_device *cdev)
1299 struct qdio_irq *irq_ptr;
1301 unsigned long saveflags;
1303 DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
1305 irq_ptr = cdev->private->qdio_data;
1309 if (cdev->private->state != DEV_STATE_ONLINE)
1312 mutex_lock(&irq_ptr->setup_mutex);
1313 if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
1318 irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
1319 irq_ptr->ccw.flags = CCW_FLAG_SLI;
1320 irq_ptr->ccw.count = irq_ptr->aqueue.count;
1321 irq_ptr->ccw.cda = 0;
1323 spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
1324 ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
1326 rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
1327 0, DOIO_DENY_PREFETCH);
1329 DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
1330 DBF_ERROR("rc:%4x", rc);
1332 spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
1337 if (is_thinint_irq(irq_ptr))
1338 tiqdio_add_input_queues(irq_ptr);
1340 /* wait for subchannel to become active */
1343 switch (irq_ptr->state) {
1344 case QDIO_IRQ_STATE_STOPPED:
1345 case QDIO_IRQ_STATE_ERR:
1349 qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
1353 mutex_unlock(&irq_ptr->setup_mutex);
1356 EXPORT_SYMBOL_GPL(qdio_activate);
1358 static inline int buf_in_between(int bufnr, int start, int count)
1360 int end = add_buf(start, count);
1363 if (bufnr >= start && bufnr < end)
1369 /* wrap-around case */
1370 if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
1378 * handle_inbound - reset processed input buffers
1379 * @q: queue containing the buffers
1381 * @bufnr: first buffer to process
1382 * @count: how many buffers are emptied
1384 static int handle_inbound(struct qdio_q *q, unsigned int callflags,
1385 int bufnr, int count)
1389 if (!q->u.in.polling)
1392 /* protect against stop polling setting an ACK for an emptied slsb */
1393 if (count == QDIO_MAX_BUFFERS_PER_Q) {
1394 /* overwriting everything, just delete polling status */
1395 q->u.in.polling = 0;
1396 q->u.in.ack_count = 0;
1398 } else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
1400 /* partial overwrite, just update ack_start */
1401 diff = add_buf(bufnr, count);
1402 diff = sub_buf(diff, q->u.in.ack_start);
1403 q->u.in.ack_count -= diff;
1404 if (q->u.in.ack_count <= 0) {
1405 q->u.in.polling = 0;
1406 q->u.in.ack_count = 0;
1409 q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
1412 /* the only ACK will be deleted, so stop polling */
1413 q->u.in.polling = 0;
1417 count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
1419 used = atomic_add_return(count, &q->nr_buf_used) - count;
1420 BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
1422 /* no need to signal as long as the adapter had free buffers */
1426 if (need_siga_in(q))
1427 return qdio_siga_input(q);
1432 * handle_outbound - process filled outbound buffers
1433 * @q: queue containing the buffers
1435 * @bufnr: first buffer to process
1436 * @count: how many buffers are filled
1438 static int handle_outbound(struct qdio_q *q, unsigned int callflags,
1439 int bufnr, int count)
1441 unsigned char state;
1444 qdio_perf_stat_inc(&perf_stats.outbound_handler);
1446 count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
1447 used = atomic_add_return(count, &q->nr_buf_used);
1448 BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
1450 if (callflags & QDIO_FLAG_PCI_OUT)
1451 q->u.out.pci_out_enabled = 1;
1453 q->u.out.pci_out_enabled = 0;
1455 if (queue_type(q) == QDIO_IQDIO_QFMT) {
1456 if (multicast_outbound(q))
1457 rc = qdio_kick_outbound_q(q);
1459 if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
1461 (count <= q->irq_ptr->ssqd_desc.mmwc)) {
1462 /* exploit enhanced SIGA */
1463 q->u.out.use_enh_siga = 1;
1464 rc = qdio_kick_outbound_q(q);
1467 * One siga-w per buffer required for unicast
1470 q->u.out.use_enh_siga = 0;
1472 rc = qdio_kick_outbound_q(q);
1480 if (need_siga_sync(q)) {
1481 qdio_siga_sync_q(q);
1485 /* try to fast requeue buffers */
1486 get_buf_state(q, prev_buf(bufnr), &state, 0);
1487 if (state != SLSB_CU_OUTPUT_PRIMED)
1488 rc = qdio_kick_outbound_q(q);
1490 DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "fast-req");
1491 qdio_perf_stat_inc(&perf_stats.fast_requeue);
1494 tasklet_schedule(&q->tasklet);
1499 * do_QDIO - process input or output buffers
1500 * @cdev: associated ccw_device for the qdio subchannel
1501 * @callflags: input or output and special flags from the program
1502 * @q_nr: queue number
1503 * @bufnr: buffer number
1504 * @count: how many buffers to process
1506 int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
1507 int q_nr, int bufnr, int count)
1509 struct qdio_irq *irq_ptr;
1511 if ((bufnr > QDIO_MAX_BUFFERS_PER_Q) ||
1512 (count > QDIO_MAX_BUFFERS_PER_Q) ||
1513 (q_nr >= QDIO_MAX_QUEUES_PER_IRQ))
1519 irq_ptr = cdev->private->qdio_data;
1523 if (callflags & QDIO_FLAG_SYNC_INPUT)
1524 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO input");
1526 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "doQDIO output");
1527 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "q:%1d flag:%4x", q_nr, callflags);
1528 DBF_DEV_EVENT(DBF_INFO, irq_ptr, "buf:%2d cnt:%3d", bufnr, count);
1530 if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
1533 if (callflags & QDIO_FLAG_SYNC_INPUT)
1534 return handle_inbound(irq_ptr->input_qs[q_nr],
1535 callflags, bufnr, count);
1536 else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
1537 return handle_outbound(irq_ptr->output_qs[q_nr],
1538 callflags, bufnr, count);
1541 EXPORT_SYMBOL_GPL(do_QDIO);
1543 static int __init init_QDIO(void)
1547 rc = qdio_setup_init();
1550 rc = tiqdio_allocate_memory();
1553 rc = qdio_debug_init();
1556 rc = qdio_setup_perf_stats();
1559 rc = tiqdio_register_thinints();
1565 qdio_remove_perf_stats();
1569 tiqdio_free_memory();
1575 static void __exit exit_QDIO(void)
1577 tiqdio_unregister_thinints();
1578 tiqdio_free_memory();
1579 qdio_remove_perf_stats();
1584 module_init(init_QDIO);
1585 module_exit(exit_QDIO);