text: /*
   * linux/drivers/s390/cio/qdio_main.c
   *
   * Linux for s390 qdio support, buffer handling, qdio API and module support.
   *
   * Copyright 2000,2008 IBM Corp.
   * Author(s): Utz Bacher <utz.bacher@de.ibm.com>
   *	      Jan Glauber <jang@linux.vnet.ibm.com>
   * 2.6 cio integration by Cornelia Huck <cornelia.huck@de.ibm.com>
   */
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/kernel.h>
  #include <linux/timer.h>
  #include <linux/delay.h>
  #include <linux/gfp.h>
  #include <linux/io.h>
  #include <linux/atomic.h>
  #include <asm/debug.h>
  #include <asm/qdio.h>
  #include <asm/ipl.h>
  
  #include "cio.h"
  #include "css.h"
  #include "device.h"
  #include "qdio.h"
  #include "qdio_debug.h"
  
  MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\
  	"Jan Glauber <jang@linux.vnet.ibm.com>");
  MODULE_DESCRIPTION("QDIO base support");
  MODULE_LICENSE("GPL");
  
  static inline int do_siga_sync(unsigned long schid,
  			       unsigned int out_mask, unsigned int in_mask,
  			       unsigned int fc)
  {
  	register unsigned long __fc asm ("0") = fc;
  	register unsigned long __schid asm ("1") = schid;
  	register unsigned long out asm ("2") = out_mask;
  	register unsigned long in asm ("3") = in_mask;
  	int cc;
  
  	asm volatile(
  		"	siga	0\n"
  		"	ipm	%0\n"
  		"	srl	%0,28\n"
  		: "=d" (cc)
  		: "d" (__fc), "d" (__schid), "d" (out), "d" (in) : "cc");
  	return cc;
  }
  
  static inline int do_siga_input(unsigned long schid, unsigned int mask,
  				unsigned int fc)
  {
  	register unsigned long __fc asm ("0") = fc;
  	register unsigned long __schid asm ("1") = schid;
  	register unsigned long __mask asm ("2") = mask;
  	int cc;
  
  	asm volatile(
  		"	siga	0\n"
  		"	ipm	%0\n"
  		"	srl	%0,28\n"
  		: "=d" (cc)
  		: "d" (__fc), "d" (__schid), "d" (__mask) : "cc", "memory");
  	return cc;
  }
  
  /**
   * do_siga_output - perform SIGA-w/wt function
   * @schid: subchannel id or in case of QEBSM the subchannel token
   * @mask: which output queues to process
   * @bb: busy bit indicator, set only if SIGA-w/wt could not access a buffer
   * @fc: function code to perform
   *
   * Returns cc or QDIO_ERROR_SIGA_ACCESS_EXCEPTION.
   * Note: For IQDC unicast queues only the highest priority queue is processed.
   */
  static inline int do_siga_output(unsigned long schid, unsigned long mask,
  				 unsigned int *bb, unsigned int fc,
  				 unsigned long aob)
  {
  	register unsigned long __fc asm("0") = fc;
  	register unsigned long __schid asm("1") = schid;
  	register unsigned long __mask asm("2") = mask;
  	register unsigned long __aob asm("3") = aob;
  	int cc = QDIO_ERROR_SIGA_ACCESS_EXCEPTION;
  
  	asm volatile(
  		"	siga	0\n"
  		"0:	ipm	%0\n"
  		"	srl	%0,28\n"
  		"1:\n"
  		EX_TABLE(0b, 1b)
  		: "+d" (cc), "+d" (__fc), "+d" (__schid), "+d" (__mask),
  		  "+d" (__aob)
  		: : "cc", "memory");
  	*bb = ((unsigned int) __fc) >> 31;
  	return cc;
  }
  
  static inline int qdio_check_ccq(struct qdio_q *q, unsigned int ccq)
  {
  	/* all done or next buffer state different */
  	if (ccq == 0 || ccq == 32)
  		return 0;
  	/* no buffer processed */
  	if (ccq == 97)
  		return 1;
  	/* not all buffers processed */
  	if (ccq == 96)
  		return 2;
  	/* notify devices immediately */
  	DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
  	return -EIO;
  }
  
  /**
   * qdio_do_eqbs - extract buffer states for QEBSM
   * @q: queue to manipulate
   * @state: state of the extracted buffers
   * @start: buffer number to start at
   * @count: count of buffers to examine
   * @auto_ack: automatically acknowledge buffers
   *
   * Returns the number of successfully extracted equal buffer states.
   * Stops processing if a state is different from the last buffers state.
   */
  static int qdio_do_eqbs(struct qdio_q *q, unsigned char *state,
  			int start, int count, int auto_ack)
  {
  	int rc, tmp_count = count, tmp_start = start, nr = q->nr, retried = 0;
  	unsigned int ccq = 0;
  
  	BUG_ON(!q->irq_ptr->sch_token);
  	qperf_inc(q, eqbs);
  
  	if (!q->is_input_q)
  		nr += q->irq_ptr->nr_input_qs;
  again:
  	ccq = do_eqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count,
  		      auto_ack);
  	rc = qdio_check_ccq(q, ccq);
  	if (!rc)
  		return count - tmp_count;
  
  	if (rc == 1) {
  		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
  		goto again;
  	}
  
  	if (rc == 2) {
  		BUG_ON(tmp_count == count);
  		qperf_inc(q, eqbs_partial);
  		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS part:%02x",
  			tmp_count);
  		/*
  		 * Retry once, if that fails bail out and process the
  		 * extracted buffers before trying again.
  		 */
  		if (!retried++)
  			goto again;
  		else
  			return count - tmp_count;
  	}
  
  	DBF_ERROR("%4x EQBS ERROR", SCH_NO(q));
  	DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
  	q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
  		   q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
  	return 0;
  }
  
  /**
   * qdio_do_sqbs - set buffer states for QEBSM
   * @q: queue to manipulate
   * @state: new state of the buffers
   * @start: first buffer number to change
   * @count: how many buffers to change
   *
   * Returns the number of successfully changed buffers.
   * Does retrying until the specified count of buffer states is set or an
   * error occurs.
   */
  static int qdio_do_sqbs(struct qdio_q *q, unsigned char state, int start,
  			int count)
  {
  	unsigned int ccq = 0;
  	int tmp_count = count, tmp_start = start;
  	int nr = q->nr;
  	int rc;
  
  	if (!count)
  		return 0;
  
  	BUG_ON(!q->irq_ptr->sch_token);
  	qperf_inc(q, sqbs);
  
  	if (!q->is_input_q)
  		nr += q->irq_ptr->nr_input_qs;
  again:
  	ccq = do_sqbs(q->irq_ptr->sch_token, state, nr, &tmp_start, &tmp_count);
  	rc = qdio_check_ccq(q, ccq);
  	if (!rc) {
  		WARN_ON(tmp_count);
  		return count - tmp_count;
  	}
  
  	if (rc == 1 || rc == 2) {
  		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
  		qperf_inc(q, sqbs_partial);
  		goto again;
  	}
  
  	DBF_ERROR("%4x SQBS ERROR", SCH_NO(q));
  	DBF_ERROR("%3d%3d%2d", count, tmp_count, nr);
  	q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
  		   q->nr, q->first_to_kick, count, q->irq_ptr->int_parm);
  	return 0;
  }
  
  /* returns number of examined buffers and their common state in *state */
  static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
  				 unsigned char *state, unsigned int count,
  				 int auto_ack, int merge_pending)
  {
  	unsigned char __state = 0;
  	int i;
  
  	BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
  	BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
  
  	if (is_qebsm(q))
  		return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
  
  	for (i = 0; i < count; i++) {
  		if (!__state) {
  			__state = q->slsb.val[bufnr];
  			if (merge_pending && __state == SLSB_P_OUTPUT_PENDING)
  				__state = SLSB_P_OUTPUT_EMPTY;
  		} else if (merge_pending) {
  			if ((q->slsb.val[bufnr] & __state) != __state)
  				break;
  		} else if (q->slsb.val[bufnr] != __state)
  			break;
  		bufnr = next_buf(bufnr);
  	}
  	*state = __state;
  	return i;
  }
  
  static inline int get_buf_state(struct qdio_q *q, unsigned int bufnr,
  				unsigned char *state, int auto_ack)
  {
  	return get_buf_states(q, bufnr, state, 1, auto_ack, 0);
  }
  
  /* wrap-around safe setting of slsb states, returns number of changed buffers */
  static inline int set_buf_states(struct qdio_q *q, int bufnr,
  				 unsigned char state, int count)
  {
  	int i;
  
  	BUG_ON(bufnr > QDIO_MAX_BUFFERS_MASK);
  	BUG_ON(count > QDIO_MAX_BUFFERS_PER_Q);
  
  	if (is_qebsm(q))
  		return qdio_do_sqbs(q, state, bufnr, count);
  
  	for (i = 0; i < count; i++) {
  		xchg(&q->slsb.val[bufnr], state);
  		bufnr = next_buf(bufnr);
  	}
  	return count;
  }
  
  static inline int set_buf_state(struct qdio_q *q, int bufnr,
  				unsigned char state)
  {
  	return set_buf_states(q, bufnr, state, 1);
  }
  
  /* set slsb states to initial state */
  static void qdio_init_buf_states(struct qdio_irq *irq_ptr)
  {
  	struct qdio_q *q;
  	int i;
  
  	for_each_input_queue(irq_ptr, q, i)
  		set_buf_states(q, 0, SLSB_P_INPUT_NOT_INIT,
  			       QDIO_MAX_BUFFERS_PER_Q);
  	for_each_output_queue(irq_ptr, q, i)
  		set_buf_states(q, 0, SLSB_P_OUTPUT_NOT_INIT,
  			       QDIO_MAX_BUFFERS_PER_Q);
  }
  
  static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
  			  unsigned int input)
  {
  	unsigned long schid = *((u32 *) &q->irq_ptr->schid);
  	unsigned int fc = QDIO_SIGA_SYNC;
  	int cc;
  
  	DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
  	qperf_inc(q, siga_sync);
  
  	if (is_qebsm(q)) {
  		schid = q->irq_ptr->sch_token;
  		fc |= QDIO_SIGA_QEBSM_FLAG;
  	}
  
  	cc = do_siga_sync(schid, output, input, fc);
  	if (unlikely(cc))
  		DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc);
  	return cc;
  }
  
  static inline int qdio_siga_sync_q(struct qdio_q *q)
  {
  	if (q->is_input_q)
  		return qdio_siga_sync(q, 0, q->mask);
  	else
  		return qdio_siga_sync(q, q->mask, 0);
  }
  
  static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
  	unsigned long aob)
  {
  	unsigned long schid = *((u32 *) &q->irq_ptr->schid);
  	unsigned int fc = QDIO_SIGA_WRITE;
  	u64 start_time = 0;
  	int retries = 0, cc;
  	unsigned long laob = 0;
  
  	if (q->u.out.use_cq && aob != 0) {
  		fc = QDIO_SIGA_WRITEQ;
  		laob = aob;
  	}
  
  	if (is_qebsm(q)) {
  		schid = q->irq_ptr->sch_token;
  		fc |= QDIO_SIGA_QEBSM_FLAG;
  	}
  again:
  	WARN_ON_ONCE((aob && queue_type(q) != QDIO_IQDIO_QFMT) ||
  		(aob && fc != QDIO_SIGA_WRITEQ));
  	cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
  
  	/* hipersocket busy condition */
  	if (unlikely(*busy_bit)) {
  		WARN_ON(queue_type(q) != QDIO_IQDIO_QFMT || cc != 2);
  		retries++;
  
  		if (!start_time) {
  			start_time = get_clock();
  			goto again;
  		}
  		if ((get_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE)
  			goto again;
  	}
  	if (retries) {
  		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr,
  			      "%4x cc2 BB1:%1d", SCH_NO(q), q->nr);
  		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "count:%u", retries);
  	}
  	return cc;
  }
  
  static inline int qdio_siga_input(struct qdio_q *q)
  {
  	unsigned long schid = *((u32 *) &q->irq_ptr->schid);
  	unsigned int fc = QDIO_SIGA_READ;
  	int cc;
  
  	DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr);
  	qperf_inc(q, siga_read);
  
  	if (is_qebsm(q)) {
  		schid = q->irq_ptr->sch_token;
  		fc |= QDIO_SIGA_QEBSM_FLAG;
  	}
  
  	cc = do_siga_input(schid, q->mask, fc);
  	if (unlikely(cc))
  		DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc);
  	return cc;
  }
  
  #define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
  #define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
  
  static inline void qdio_sync_queues(struct qdio_q *q)
  {
  	/* PCI capable outbound queues will also be scanned so sync them too */
  	if (pci_out_supported(q))
  		qdio_siga_sync_all(q);
  	else
  		qdio_siga_sync_q(q);
  }
  
  int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
  			unsigned char *state)
  {
  	if (need_siga_sync(q))
  		qdio_siga_sync_q(q);
  	return get_buf_states(q, bufnr, state, 1, 0, 0);
  }
  
  static inline void qdio_stop_polling(struct qdio_q *q)
  {
  	if (!q->u.in.polling)
  		return;
  
  	q->u.in.polling = 0;
  	qperf_inc(q, stop_polling);
  
  	/* show the card that we are not polling anymore */
  	if (is_qebsm(q)) {
  		set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
  			       q->u.in.ack_count);
  		q->u.in.ack_count = 0;
  	} else
  		set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
  }
  
  static inline void account_sbals(struct qdio_q *q, int count)
  {
  	int pos = 0;
  
  	q->q_stats.nr_sbal_total += count;
  	if (count == QDIO_MAX_BUFFERS_MASK) {
  		q->q_stats.nr_sbals[7]++;
  		return;
  	}
  	while (count >>= 1)
  		pos++;
  	q->q_stats.nr_sbals[pos]++;
  }
  
  static void process_buffer_error(struct qdio_q *q, int count)
  {
  	unsigned char state = (q->is_input_q) ? SLSB_P_INPUT_NOT_INIT :
  					SLSB_P_OUTPUT_NOT_INIT;
  
  	q->qdio_error |= QDIO_ERROR_SLSB_STATE;
  
  	/* special handling for no target buffer empty */
  	if ((!q->is_input_q &&
  	    (q->sbal[q->first_to_check]->element[15].sflags) == 0x10)) {
  		qperf_inc(q, target_full);
  		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x",
  			      q->first_to_check);
  		goto set;
  	}
  
  	DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
  	DBF_ERROR((q->is_input_q) ? "IN:%2d" : "OUT:%2d", q->nr);
  	DBF_ERROR("FTC:%3d C:%3d", q->first_to_check, count);
  	DBF_ERROR("F14:%2x F15:%2x",
  		  q->sbal[q->first_to_check]->element[14].sflags,
  		  q->sbal[q->first_to_check]->element[15].sflags);
  
  set:
  	/*
  	 * Interrupts may be avoided as long as the error is present
  	 * so change the buffer state immediately to avoid starvation.
  	 */
  	set_buf_states(q, q->first_to_check, state, count);
  }
  
  static inline void inbound_primed(struct qdio_q *q, int count)
  {
  	int new;
  
  	DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim: %02x", count);
  
  	/* for QEBSM the ACK was already set by EQBS */
  	if (is_qebsm(q)) {
  		if (!q->u.in.polling) {
  			q->u.in.polling = 1;
  			q->u.in.ack_count = count;
  			q->u.in.ack_start = q->first_to_check;
  			return;
  		}
  
  		/* delete the previous ACK's */
  		set_buf_states(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT,
  			       q->u.in.ack_count);
  		q->u.in.ack_count = count;
  		q->u.in.ack_start = q->first_to_check;
  		return;
  	}
  
  	/*
  	 * ACK the newest buffer. The ACK will be removed in qdio_stop_polling
  	 * or by the next inbound run.
  	 */
  	new = add_buf(q->first_to_check, count - 1);
  	if (q->u.in.polling) {
  		/* reset the previous ACK but first set the new one */
  		set_buf_state(q, new, SLSB_P_INPUT_ACK);
  		set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);
  	} else {
  		q->u.in.polling = 1;
  		set_buf_state(q, new, SLSB_P_INPUT_ACK);
  	}
  
  	q->u.in.ack_start = new;
  	count--;
  	if (!count)
  		return;
  	/* need to change ALL buffers to get more interrupts */
  	set_buf_states(q, q->first_to_check, SLSB_P_INPUT_NOT_INIT, count);
  }
  
  static int get_inbound_buffer_frontier(struct qdio_q *q)
  {
  	int count, stop;
  	unsigned char state = 0;
  
  	q->timestamp = get_clock_fast();
  
  	/*
  	 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
  	 * would return 0.
  	 */
  	count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
  	stop = add_buf(q->first_to_check, count);
  
  	if (q->first_to_check == stop)
  		goto out;
  
  	/*
  	 * No siga sync here, as a PCI or we after a thin interrupt
  	 * already sync'ed the queues.
  	 */
  	count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);
  	if (!count)
  		goto out;
  
  	switch (state) {
  	case SLSB_P_INPUT_PRIMED:
  		inbound_primed(q, count);
  		q->first_to_check = add_buf(q->first_to_check, count);
  		if (atomic_sub(count, &q->nr_buf_used) == 0)
  			qperf_inc(q, inbound_queue_full);
  		if (q->irq_ptr->perf_stat_enabled)
  			account_sbals(q, count);
  		break;
  	case SLSB_P_INPUT_ERROR:
  		process_buffer_error(q, count);
  		q->first_to_check = add_buf(q->first_to_check, count);
  		atomic_sub(count, &q->nr_buf_used);
  		if (q->irq_ptr->perf_stat_enabled)
  			account_sbals_error(q, count);
  		break;
  	case SLSB_CU_INPUT_EMPTY:
  	case SLSB_P_INPUT_NOT_INIT:
  	case SLSB_P_INPUT_ACK:
  		if (q->irq_ptr->perf_stat_enabled)
  			q->q_stats.nr_sbal_nop++;
  		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop");
  		break;
  	default:
  		BUG();
  	}
  out:
  	return q->first_to_check;
  }
  
  static int qdio_inbound_q_moved(struct qdio_q *q)
  {
  	int bufnr;
  
  	bufnr = get_inbound_buffer_frontier(q);
  
  	if ((bufnr != q->last_move) || q->qdio_error) {
  		q->last_move = bufnr;
  		if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)
  			q->u.in.timestamp = get_clock();
  		return 1;
  	} else
  		return 0;
  }
  
  static inline int qdio_inbound_q_done(struct qdio_q *q)
  {
  	unsigned char state = 0;
  
  	if (!atomic_read(&q->nr_buf_used))
  		return 1;
  
  	if (need_siga_sync(q))
  		qdio_siga_sync_q(q);
  	get_buf_state(q, q->first_to_check, &state, 0);
  
  	if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
  		/* more work coming */
  		return 0;
  
  	if (is_thinint_irq(q->irq_ptr))
  		return 1;
  
  	/* don't poll under z/VM */
  	if (MACHINE_IS_VM)
  		return 1;
  
  	/*
  	 * At this point we know, that inbound first_to_check
  	 * has (probably) not moved (see qdio_inbound_processing).
  	 */
  	if (get_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) {
  		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x",
  			      q->first_to_check);
  		return 1;
  	} else
  		return 0;
  }
  
  static inline int contains_aobs(struct qdio_q *q)
  {
  	return !q->is_input_q && q->u.out.use_cq;
  }
  
  static inline void qdio_trace_aob(struct qdio_irq *irq, struct qdio_q *q,
  				int i, struct qaob *aob)
  {
  	int tmp;
  
  	DBF_DEV_EVENT(DBF_INFO, irq, "AOB%d:%lx", i,
  			(unsigned long) virt_to_phys(aob));
  	DBF_DEV_EVENT(DBF_INFO, irq, "RES00:%lx",
  			(unsigned long) aob->res0[0]);
  	DBF_DEV_EVENT(DBF_INFO, irq, "RES01:%lx",
  			(unsigned long) aob->res0[1]);
  	DBF_DEV_EVENT(DBF_INFO, irq, "RES02:%lx",
  			(unsigned long) aob->res0[2]);
  	DBF_DEV_EVENT(DBF_INFO, irq, "RES03:%lx",
  			(unsigned long) aob->res0[3]);
  	DBF_DEV_EVENT(DBF_INFO, irq, "RES04:%lx",
  			(unsigned long) aob->res0[4]);
  	DBF_DEV_EVENT(DBF_INFO, irq, "RES05:%lx",
  			(unsigned long) aob->res0[5]);
  	DBF_DEV_EVENT(DBF_INFO, irq, "RES1:%x", aob->res1);
  	DBF_DEV_EVENT(DBF_INFO, irq, "RES2:%x", aob->res2);
  	DBF_DEV_EVENT(DBF_INFO, irq, "RES3:%x", aob->res3);
  	DBF_DEV_EVENT(DBF_INFO, irq, "AORC:%u", aob->aorc);
  	DBF_DEV_EVENT(DBF_INFO, irq, "FLAGS:%u", aob->flags);
  	DBF_DEV_EVENT(DBF_INFO, irq, "CBTBS:%u", aob->cbtbs);
  	DBF_DEV_EVENT(DBF_INFO, irq, "SBC:%u", aob->sb_count);
  	for (tmp = 0; tmp < QDIO_MAX_ELEMENTS_PER_BUFFER; ++tmp) {
  		DBF_DEV_EVENT(DBF_INFO, irq, "SBA%d:%lx", tmp,
  				(unsigned long) aob->sba[tmp]);
  		DBF_DEV_EVENT(DBF_INFO, irq, "rSBA%d:%lx", tmp,
  				(unsigned long) q->sbal[i]->element[tmp].addr);
  		DBF_DEV_EVENT(DBF_INFO, irq, "DC%d:%u", tmp, aob->dcount[tmp]);
  		DBF_DEV_EVENT(DBF_INFO, irq, "rDC%d:%u", tmp,
  				q->sbal[i]->element[tmp].length);
  	}
  	DBF_DEV_EVENT(DBF_INFO, irq, "USER0:%lx", (unsigned long) aob->user0);
  	for (tmp = 0; tmp < 2; ++tmp) {
  		DBF_DEV_EVENT(DBF_INFO, irq, "RES4%d:%lx", tmp,
  			(unsigned long) aob->res4[tmp]);
  	}
  	DBF_DEV_EVENT(DBF_INFO, irq, "USER1:%lx", (unsigned long) aob->user1);
  	DBF_DEV_EVENT(DBF_INFO, irq, "USER2:%lx", (unsigned long) aob->user2);
  }
  
  static inline void qdio_handle_aobs(struct qdio_q *q, int start, int count)
  {
  	unsigned char state = 0;
  	int j, b = start;
  
  	if (!contains_aobs(q))
  		return;
  
  	for (j = 0; j < count; ++j) {
  		get_buf_state(q, b, &state, 0);
  		if (state == SLSB_P_OUTPUT_PENDING) {
  			struct qaob *aob = q->u.out.aobs[b];
  			if (aob == NULL)
  				continue;
  
  			BUG_ON(q->u.out.sbal_state == NULL);
  			q->u.out.sbal_state[b].flags |=
  				QDIO_OUTBUF_STATE_FLAG_PENDING;
  			q->u.out.aobs[b] = NULL;
  		} else if (state == SLSB_P_OUTPUT_EMPTY) {
  			BUG_ON(q->u.out.sbal_state == NULL);
  			q->u.out.sbal_state[b].aob = NULL;
  		}
  		b = next_buf(b);
  	}
  }
  
  static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
  					int bufnr)
  {
  	unsigned long phys_aob = 0;
  
  	if (!q->use_cq)
  		goto out;
  
  	if (!q->aobs[bufnr]) {
  		struct qaob *aob = qdio_allocate_aob();
  		q->aobs[bufnr] = aob;
  	}
  	if (q->aobs[bufnr]) {
  		BUG_ON(q->sbal_state == NULL);
  		q->sbal_state[bufnr].flags = QDIO_OUTBUF_STATE_FLAG_NONE;
  		q->sbal_state[bufnr].aob = q->aobs[bufnr];
  		q->aobs[bufnr]->user1 = (u64) q->sbal_state[bufnr].user;
  		phys_aob = virt_to_phys(q->aobs[bufnr]);
  		BUG_ON(phys_aob & 0xFF);
  	}
  
  out:
  	return phys_aob;
  }
  
  static void qdio_kick_handler(struct qdio_q *q)
  {
  	int start = q->first_to_kick;
  	int end = q->first_to_check;
  	int count;
  
  	if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
  		return;
  
  	count = sub_buf(end, start);
  
  	if (q->is_input_q) {
  		qperf_inc(q, inbound_handler);
  		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "kih s:%02x c:%02x", start, count);
  	} else {
  		qperf_inc(q, outbound_handler);
  		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "koh: s:%02x c:%02x",
  			      start, count);
  	}
  
  	qdio_handle_aobs(q, start, count);
  
  	q->handler(q->irq_ptr->cdev, q->qdio_error, q->nr, start, count,
  		   q->irq_ptr->int_parm);
  
  	/* for the next time */
  	q->first_to_kick = end;
  	q->qdio_error = 0;
  }
  
  static void __qdio_inbound_processing(struct qdio_q *q)
  {
  	qperf_inc(q, tasklet_inbound);
  
  	if (!qdio_inbound_q_moved(q))
  		return;
  
  	qdio_kick_handler(q);
  
  	if (!qdio_inbound_q_done(q)) {
  		/* means poll time is not yet over */
  		qperf_inc(q, tasklet_inbound_resched);
  		if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
  			tasklet_schedule(&q->tasklet);
  			return;
  		}
  	}
  
  	qdio_stop_polling(q);
  	/*
  	 * We need to check again to not lose initiative after
  	 * resetting the ACK state.
  	 */
  	if (!qdio_inbound_q_done(q)) {
  		qperf_inc(q, tasklet_inbound_resched2);
  		if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
  			tasklet_schedule(&q->tasklet);
  	}
  }
  
  void qdio_inbound_processing(unsigned long data)
  {
  	struct qdio_q *q = (struct qdio_q *)data;
  	__qdio_inbound_processing(q);
  }
  
  static int get_outbound_buffer_frontier(struct qdio_q *q)
  {
  	int count, stop;
  	unsigned char state = 0;
  
  	q->timestamp = get_clock_fast();
  
  	if (need_siga_sync(q))
  		if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
  		    !pci_out_supported(q)) ||
  		    (queue_type(q) == QDIO_IQDIO_QFMT &&
  		    multicast_outbound(q)))
  			qdio_siga_sync_q(q);
  
  	/*
  	 * Don't check 128 buffers, as otherwise qdio_inbound_q_moved
  	 * would return 0.
  	 */
  	count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);
  	stop = add_buf(q->first_to_check, count);
  	if (q->first_to_check == stop)
  		goto out;
  
  	count = get_buf_states(q, q->first_to_check, &state, count, 0, 1);
  	if (!count)
  		goto out;
  
  	switch (state) {
  	case SLSB_P_OUTPUT_PENDING:
  		BUG();
  	case SLSB_P_OUTPUT_EMPTY:
  		/* the adapter got it */
  		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr,
  			"out empty:%1d %02x", q->nr, count);
  
  		atomic_sub(count, &q->nr_buf_used);
  		q->first_to_check = add_buf(q->first_to_check, count);
  		if (q->irq_ptr->perf_stat_enabled)
  			account_sbals(q, count);
  
  		break;
  	case SLSB_P_OUTPUT_ERROR:
  		process_buffer_error(q, count);
  		q->first_to_check = add_buf(q->first_to_check, count);
  		atomic_sub(count, &q->nr_buf_used);
  		if (q->irq_ptr->perf_stat_enabled)
  			account_sbals_error(q, count);
  		break;
  	case SLSB_CU_OUTPUT_PRIMED:
  		/* the adapter has not fetched the output yet */
  		if (q->irq_ptr->perf_stat_enabled)
  			q->q_stats.nr_sbal_nop++;
  		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out primed:%1d",
  			      q->nr);
  		break;
  	case SLSB_P_OUTPUT_NOT_INIT:
  	case SLSB_P_OUTPUT_HALTED:
  		break;
  	default:
  		BUG();
  	}
  
  out:
  	return q->first_to_check;
  }
  
  /* all buffers processed? */
  static inline int qdio_outbound_q_done(struct qdio_q *q)
  {
  	return atomic_read(&q->nr_buf_used) == 0;
  }
  
  static inline int qdio_outbound_q_moved(struct qdio_q *q)
  {
  	int bufnr;
  
  	bufnr = get_outbound_buffer_frontier(q);
  
  	if ((bufnr != q->last_move) || q->qdio_error) {
  		q->last_move = bufnr;
  		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);
  		return 1;
  	} else
  		return 0;
  }
  
  static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
  {
  	int retries = 0, cc;
  	unsigned int busy_bit;
  
  	if (!need_siga_out(q))
  		return 0;
  
  	DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w:%1d", q->nr);
  retry:
  	qperf_inc(q, siga_write);
  
  	cc = qdio_siga_output(q, &busy_bit, aob);
  	switch (cc) {
  	case 0:
  		break;
  	case 2:
  		if (busy_bit) {
  			while (++retries < QDIO_BUSY_BIT_RETRIES) {
  				mdelay(QDIO_BUSY_BIT_RETRY_DELAY);
  				goto retry;
  			}
  			DBF_ERROR("%4x cc2 BBC:%1d", SCH_NO(q), q->nr);
  			cc |= QDIO_ERROR_SIGA_BUSY;
  		} else
  			DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
  		break;
  	case 1:
  	case 3:
  		DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
  		break;
  	}
  	if (retries) {
  		DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
  		DBF_ERROR("count:%u", retries);
  	}
  	return cc;
  }
  
  static void __qdio_outbound_processing(struct qdio_q *q)
  {
  	qperf_inc(q, tasklet_outbound);
  	BUG_ON(atomic_read(&q->nr_buf_used) < 0);
  
  	if (qdio_outbound_q_moved(q))
  		qdio_kick_handler(q);
  
  	if (queue_type(q) == QDIO_ZFCP_QFMT)
  		if (!pci_out_supported(q) && !qdio_outbound_q_done(q))
  			goto sched;
  
  	if (q->u.out.pci_out_enabled)
  		return;
  
  	/*
  	 * Now we know that queue type is either qeth without pci enabled
  	 * or HiperSockets. Make sure buffer switch from PRIMED to EMPTY
  	 * is noticed and outbound_handler is called after some time.
  	 */
  	if (qdio_outbound_q_done(q))
  		del_timer(&q->u.out.timer);
  	else
  		if (!timer_pending(&q->u.out.timer))
  			mod_timer(&q->u.out.timer, jiffies + 10 * HZ);
  	return;
  
  sched:
  	if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
  		return;
  	tasklet_schedule(&q->tasklet);
  }
  
  /* outbound tasklet */
  void qdio_outbound_processing(unsigned long data)
  {
  	struct qdio_q *q = (struct qdio_q *)data;
  	__qdio_outbound_processing(q);
  }
  
  void qdio_outbound_timer(unsigned long data)
  {
  	struct qdio_q *q = (struct qdio_q *)data;
  
  	if (unlikely(q->irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
  		return;
  	tasklet_schedule(&q->tasklet);
  }
  
  static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
  {
  	struct qdio_q *out;
  	int i;
  
  	if (!pci_out_supported(q))
  		return;
  
  	for_each_output_queue(q->irq_ptr, out, i)
  		if (!qdio_outbound_q_done(out))
  			tasklet_schedule(&out->tasklet);
  }
  
  static void __tiqdio_inbound_processing(struct qdio_q *q)
  {
  	qperf_inc(q, tasklet_inbound);
  	if (need_siga_sync(q) && need_siga_sync_after_ai(q))
  		qdio_sync_queues(q);
  
  	/*
  	 * The interrupt could be caused by a PCI request. Check the
  	 * PCI capable outbound queues.
  	 */
  	qdio_check_outbound_after_thinint(q);
  
  	if (!qdio_inbound_q_moved(q))
  		return;
  
  	qdio_kick_handler(q);
  
  	if (!qdio_inbound_q_done(q)) {
  		qperf_inc(q, tasklet_inbound_resched);
  		if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) {
  			tasklet_schedule(&q->tasklet);
  			return;
  		}
  	}
  
  	qdio_stop_polling(q);
  	/*
  	 * We need to check again to not lose initiative after
  	 * resetting the ACK state.
  	 */
  	if (!qdio_inbound_q_done(q)) {
  		qperf_inc(q, tasklet_inbound_resched2);
  		if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED))
  			tasklet_schedule(&q->tasklet);
  	}
  }
  
  void tiqdio_inbound_processing(unsigned long data)
  {
  	struct qdio_q *q = (struct qdio_q *)data;
  	__tiqdio_inbound_processing(q);
  }
  
  static inline void qdio_set_state(struct qdio_irq *irq_ptr,
  				  enum qdio_irq_states state)
  {
  	DBF_DEV_EVENT(DBF_INFO, irq_ptr, "newstate: %1d", state);
  
  	irq_ptr->state = state;
  	mb();
  }
  
  static void qdio_irq_check_sense(struct qdio_irq *irq_ptr, struct irb *irb)
  {
  	if (irb->esw.esw0.erw.cons) {
  		DBF_ERROR("%4x sense:", irq_ptr->schid.sch_no);
  		DBF_ERROR_HEX(irb, 64);
  		DBF_ERROR_HEX(irb->ecw, 64);
  	}
  }
  
  /* PCI interrupt handler */
  static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
  {
  	int i;
  	struct qdio_q *q;
  
  	if (unlikely(irq_ptr->state == QDIO_IRQ_STATE_STOPPED))
  		return;
  
  	for_each_input_queue(irq_ptr, q, i) {
  		if (q->u.in.queue_start_poll) {
  			/* skip if polling is enabled or already in work */
  			if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
  				     &q->u.in.queue_irq_state)) {
  				qperf_inc(q, int_discarded);
  				continue;
  			}
  			q->u.in.queue_start_poll(q->irq_ptr->cdev, q->nr,
  						 q->irq_ptr->int_parm);
  		} else {
  			tasklet_schedule(&q->tasklet);
  		}
  	}
  
  	if (!pci_out_supported(q))
  		return;
  
  	for_each_output_queue(irq_ptr, q, i) {
  		if (qdio_outbound_q_done(q))
  			continue;
  		if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
  			qdio_siga_sync_q(q);
  		tasklet_schedule(&q->tasklet);
  	}
  }
  
  static void qdio_handle_activate_check(struct ccw_device *cdev,
  				unsigned long intparm, int cstat, int dstat)
  {
  	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
  	struct qdio_q *q;
  	int count;
  
  	DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
  	DBF_ERROR("intp :%lx", intparm);
  	DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
  
  	if (irq_ptr->nr_input_qs) {
  		q = irq_ptr->input_qs[0];
  	} else if (irq_ptr->nr_output_qs) {
  		q = irq_ptr->output_qs[0];
  	} else {
  		dump_stack();
  		goto no_handler;
  	}
  
  	count = sub_buf(q->first_to_check, q->first_to_kick);
  	q->handler(q->irq_ptr->cdev, QDIO_ERROR_ACTIVATE_CHECK_CONDITION,
  		   q->nr, q->first_to_kick, count, irq_ptr->int_parm);
  no_handler:
  	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
  	/*
  	 * In case of z/VM LGR (Live Guest Migration) QDIO recovery will happen.
  	 * Therefore we call the LGR detection function here.
  	 */
  	lgr_info_log();
  }
  
  static void qdio_establish_handle_irq(struct ccw_device *cdev, int cstat,
  				      int dstat)
  {
  	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
  
  	DBF_DEV_EVENT(DBF_INFO, irq_ptr, "qest irq");
  
  	if (cstat)
  		goto error;
  	if (dstat & ~(DEV_STAT_DEV_END | DEV_STAT_CHN_END))
  		goto error;
  	if (!(dstat & DEV_STAT_DEV_END))
  		goto error;
  	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ESTABLISHED);
  	return;
  
  error:
  	DBF_ERROR("%4x EQ:error", irq_ptr->schid.sch_no);
  	DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
  	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
  }
  
  /* qdio interrupt handler */
  void qdio_int_handler(struct ccw_device *cdev, unsigned long intparm,
  		      struct irb *irb)
  {
  	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
  	int cstat, dstat;
  
  	if (!intparm || !irq_ptr) {
  		DBF_ERROR("qint:%4x", cdev->private->schid.sch_no);
  		return;
  	}
  
  	if (irq_ptr->perf_stat_enabled)
  		irq_ptr->perf_stat.qdio_int++;
  
  	if (IS_ERR(irb)) {
  		switch (PTR_ERR(irb)) {
  		case -EIO:
  			DBF_ERROR("%4x IO error", irq_ptr->schid.sch_no);
  			qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ERR);
  			wake_up(&cdev->private->wait_q);
  			return;
  		default:
  			WARN_ON(1);
  			return;
  		}
  	}
  	qdio_irq_check_sense(irq_ptr, irb);
  	cstat = irb->scsw.cmd.cstat;
  	dstat = irb->scsw.cmd.dstat;
  
  	switch (irq_ptr->state) {
  	case QDIO_IRQ_STATE_INACTIVE:
  		qdio_establish_handle_irq(cdev, cstat, dstat);
  		break;
  	case QDIO_IRQ_STATE_CLEANUP:
  		qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
  		break;
  	case QDIO_IRQ_STATE_ESTABLISHED:
  	case QDIO_IRQ_STATE_ACTIVE:
  		if (cstat & SCHN_STAT_PCI) {
  			qdio_int_handler_pci(irq_ptr);
  			return;
  		}
  		if (cstat || dstat)
  			qdio_handle_activate_check(cdev, intparm, cstat,
  						   dstat);
  		break;
  	case QDIO_IRQ_STATE_STOPPED:
  		break;
  	default:
  		WARN_ON(1);
  	}
  	wake_up(&cdev->private->wait_q);
  }
  
  /**
   * qdio_get_ssqd_desc - get qdio subchannel description
   * @cdev: ccw device to get description for
   * @data: where to store the ssqd
   *
   * Returns 0 or an error code. The results of the chsc are stored in the
   * specified structure.
   */
  int qdio_get_ssqd_desc(struct ccw_device *cdev,
  		       struct qdio_ssqd_desc *data)
  {
  
  	if (!cdev || !cdev->private)
  		return -EINVAL;
  
  	DBF_EVENT("get ssqd:%4x", cdev->private->schid.sch_no);
  	return qdio_setup_get_ssqd(NULL, &cdev->private->schid, data);
  }
  EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
  
  static void qdio_shutdown_queues(struct ccw_device *cdev)
  {
  	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
  	struct qdio_q *q;
  	int i;
  
  	for_each_input_queue(irq_ptr, q, i)
  		tasklet_kill(&q->tasklet);
  
  	for_each_output_queue(irq_ptr, q, i) {
  		del_timer(&q->u.out.timer);
  		tasklet_kill(&q->tasklet);
  	}
  }
  
  /**
   * qdio_shutdown - shut down a qdio subchannel
   * @cdev: associated ccw device
   * @how: use halt or clear to shutdown
   */
  int qdio_shutdown(struct ccw_device *cdev, int how)
  {
  	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
  	int rc;
  	unsigned long flags;
  
  	if (!irq_ptr)
  		return -ENODEV;
  
  	BUG_ON(irqs_disabled());
  	DBF_EVENT("qshutdown:%4x", cdev->private->schid.sch_no);
  
  	mutex_lock(&irq_ptr->setup_mutex);
  	/*
  	 * Subchannel was already shot down. We cannot prevent being called
  	 * twice since cio may trigger a shutdown asynchronously.
  	 */
  	if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
  		mutex_unlock(&irq_ptr->setup_mutex);
  		return 0;
  	}
  
  	/*
  	 * Indicate that the device is going down. Scheduling the queue
  	 * tasklets is forbidden from here on.
  	 */
  	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
  
  	tiqdio_remove_input_queues(irq_ptr);
  	qdio_shutdown_queues(cdev);
  	qdio_shutdown_debug_entries(irq_ptr, cdev);
  
  	/* cleanup subchannel */
  	spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
  
  	if (how & QDIO_FLAG_CLEANUP_USING_CLEAR)
  		rc = ccw_device_clear(cdev, QDIO_DOING_CLEANUP);
  	else
  		/* default behaviour is halt */
  		rc = ccw_device_halt(cdev, QDIO_DOING_CLEANUP);
  	if (rc) {
  		DBF_ERROR("%4x SHUTD ERR", irq_ptr->schid.sch_no);
  		DBF_ERROR("rc:%4d", rc);
  		goto no_cleanup;
  	}
  
  	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_CLEANUP);
  	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
  	wait_event_interruptible_timeout(cdev->private->wait_q,
  		irq_ptr->state == QDIO_IRQ_STATE_INACTIVE ||
  		irq_ptr->state == QDIO_IRQ_STATE_ERR,
  		10 * HZ);
  	spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
  
  no_cleanup:
  	qdio_shutdown_thinint(irq_ptr);
  
  	/* restore interrupt handler */
  	if ((void *)cdev->handler == (void *)qdio_int_handler)
  		cdev->handler = irq_ptr->orig_handler;
  	spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
  
  	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
  	mutex_unlock(&irq_ptr->setup_mutex);
  	if (rc)
  		return rc;
  	return 0;
  }
  EXPORT_SYMBOL_GPL(qdio_shutdown);
  
  /**
   * qdio_free - free data structures for a qdio subchannel
   * @cdev: associated ccw device
   */
  int qdio_free(struct ccw_device *cdev)
  {
  	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
  
  	if (!irq_ptr)
  		return -ENODEV;
  
  	DBF_EVENT("qfree:%4x", cdev->private->schid.sch_no);
  	mutex_lock(&irq_ptr->setup_mutex);
  
  	if (irq_ptr->debug_area != NULL) {
  		debug_unregister(irq_ptr->debug_area);
  		irq_ptr->debug_area = NULL;
  	}
  	cdev->private->qdio_data = NULL;
  	mutex_unlock(&irq_ptr->setup_mutex);
  
  	qdio_release_memory(irq_ptr);
  	return 0;
  }
  EXPORT_SYMBOL_GPL(qdio_free);
  
  /**
   * qdio_allocate - allocate qdio queues and associated data
   * @init_data: initialization data
   */
  int qdio_allocate(struct qdio_initialize *init_data)
  {
  	struct qdio_irq *irq_ptr;
  
  	DBF_EVENT("qallocate:%4x", init_data->cdev->private->schid.sch_no);
  
  	if ((init_data->no_input_qs && !init_data->input_handler) ||
  	    (init_data->no_output_qs && !init_data->output_handler))
  		return -EINVAL;
  
  	if ((init_data->no_input_qs > QDIO_MAX_QUEUES_PER_IRQ) ||
  	    (init_data->no_output_qs > QDIO_MAX_QUEUES_PER_IRQ))
  		return -EINVAL;
  
  	if ((!init_data->input_sbal_addr_array) ||
  	    (!init_data->output_sbal_addr_array))
  		return -EINVAL;
  
  	/* irq_ptr must be in GFP_DMA since it contains ccw1.cda */
  	irq_ptr = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
  	if (!irq_ptr)
  		goto out_err;
  
  	mutex_init(&irq_ptr->setup_mutex);
  	qdio_allocate_dbf(init_data, irq_ptr);
  
  	/*
  	 * Allocate a page for the chsc calls in qdio_establish.
  	 * Must be pre-allocated since a zfcp recovery will call
  	 * qdio_establish. In case of low memory and swap on a zfcp disk
  	 * we may not be able to allocate memory otherwise.
  	 */
  	irq_ptr->chsc_page = get_zeroed_page(GFP_KERNEL);
  	if (!irq_ptr->chsc_page)
  		goto out_rel;
  
  	/* qdr is used in ccw1.cda which is u32 */
  	irq_ptr->qdr = (struct qdr *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
  	if (!irq_ptr->qdr)
  		goto out_rel;
  	WARN_ON((unsigned long)irq_ptr->qdr & 0xfff);
  
  	if (qdio_allocate_qs(irq_ptr, init_data->no_input_qs,
  			     init_data->no_output_qs))
  		goto out_rel;
  
  	init_data->cdev->private->qdio_data = irq_ptr;
  	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
  	return 0;
  out_rel:
  	qdio_release_memory(irq_ptr);
  out_err:
  	return -ENOMEM;
  }
  EXPORT_SYMBOL_GPL(qdio_allocate);
  
  static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
  {
  	struct qdio_q *q = irq_ptr->input_qs[0];
  	int i, use_cq = 0;
  
  	if (irq_ptr->nr_input_qs > 1 && queue_type(q) == QDIO_IQDIO_QFMT)
  		use_cq = 1;
  
  	for_each_output_queue(irq_ptr, q, i) {
  		if (use_cq) {
  			if (qdio_enable_async_operation(&q->u.out) < 0) {
  				use_cq = 0;
  				continue;
  			}
  		} else
  			qdio_disable_async_operation(&q->u.out);
  	}
  	DBF_EVENT("use_cq:%d", use_cq);
  }
  
  /**
   * qdio_establish - establish queues on a qdio subchannel
   * @init_data: initialization data
   */
  int qdio_establish(struct qdio_initialize *init_data)
  {
  	struct qdio_irq *irq_ptr;
  	struct ccw_device *cdev = init_data->cdev;
  	unsigned long saveflags;
  	int rc;
  
  	DBF_EVENT("qestablish:%4x", cdev->private->schid.sch_no);
  
  	irq_ptr = cdev->private->qdio_data;
  	if (!irq_ptr)
  		return -ENODEV;
  
  	if (cdev->private->state != DEV_STATE_ONLINE)
  		return -EINVAL;
  
  	mutex_lock(&irq_ptr->setup_mutex);
  	qdio_setup_irq(init_data);
  
  	rc = qdio_establish_thinint(irq_ptr);
  	if (rc) {
  		mutex_unlock(&irq_ptr->setup_mutex);
  		qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
  		return rc;
  	}
  
  	/* establish q */
  	irq_ptr->ccw.cmd_code = irq_ptr->equeue.cmd;
  	irq_ptr->ccw.flags = CCW_FLAG_SLI;
  	irq_ptr->ccw.count = irq_ptr->equeue.count;
  	irq_ptr->ccw.cda = (u32)((addr_t)irq_ptr->qdr);
  
  	spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
  	ccw_device_set_options_mask(cdev, 0);
  
  	rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
  	if (rc) {
  		DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
  		DBF_ERROR("rc:%4x", rc);
  	}
  	spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
  
  	if (rc) {
  		mutex_unlock(&irq_ptr->setup_mutex);
  		qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
  		return rc;
  	}
  
  	wait_event_interruptible_timeout(cdev->private->wait_q,
  		irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
  		irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
  
  	if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
  		mutex_unlock(&irq_ptr->setup_mutex);
  		qdio_shutdown(cdev, QDIO_FLAG_CLEANUP_USING_CLEAR);
  		return -EIO;
  	}
  
  	qdio_setup_ssqd_info(irq_ptr);
  
  	qdio_detect_hsicq(irq_ptr);
  
  	/* qebsm is now setup if available, initialize buffer states */
  	qdio_init_buf_states(irq_ptr);
  
  	mutex_unlock(&irq_ptr->setup_mutex);
  	qdio_print_subchannel_info(irq_ptr, cdev);
  	qdio_setup_debug_entries(irq_ptr, cdev);
  	return 0;
  }
  EXPORT_SYMBOL_GPL(qdio_establish);
  
  /**
   * qdio_activate - activate queues on a qdio subchannel
   * @cdev: associated cdev
   */
  int qdio_activate(struct ccw_device *cdev)
  {
  	struct qdio_irq *irq_ptr;
  	int rc;
  	unsigned long saveflags;
  
  	DBF_EVENT("qactivate:%4x", cdev->private->schid.sch_no);
  
  	irq_ptr = cdev->private->qdio_data;
  	if (!irq_ptr)
  		return -ENODEV;
  
  	if (cdev->private->state != DEV_STATE_ONLINE)
  		return -EINVAL;
  
  	mutex_lock(&irq_ptr->setup_mutex);
  	if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
  		rc = -EBUSY;
  		goto out;
  	}
  
  	irq_ptr->ccw.cmd_code = irq_ptr->aqueue.cmd;
  	irq_ptr->ccw.flags = CCW_FLAG_SLI;
  	irq_ptr->ccw.count = irq_ptr->aqueue.count;
  	irq_ptr->ccw.cda = 0;
  
  	spin_lock_irqsave(get_ccwdev_lock(cdev), saveflags);
  	ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
  
  	rc = ccw_device_start(cdev, &irq_ptr->ccw, QDIO_DOING_ACTIVATE,
  			      0, DOIO_DENY_PREFETCH);
  	if (rc) {
  		DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
  		DBF_ERROR("rc:%4x", rc);
  	}
  	spin_unlock_irqrestore(get_ccwdev_lock(cdev), saveflags);
  
  	if (rc)
  		goto out;
  
  	if (is_thinint_irq(irq_ptr))
  		tiqdio_add_input_queues(irq_ptr);
  
  	/* wait for subchannel to become active */
  	msleep(5);
  
  	switch (irq_ptr->state) {
  	case QDIO_IRQ_STATE_STOPPED:
  	case QDIO_IRQ_STATE_ERR:
  		rc = -EIO;
  		break;
  	default:
  		qdio_set_state(irq_ptr, QDIO_IRQ_STATE_ACTIVE);
  		rc = 0;
  	}
  out:
  	mutex_unlock(&irq_ptr->setup_mutex);
  	return rc;
  }
  EXPORT_SYMBOL_GPL(qdio_activate);
  
  static inline int buf_in_between(int bufnr, int start, int count)
  {
  	int end = add_buf(start, count);
  
  	if (end > start) {
  		if (bufnr >= start && bufnr < end)
  			return 1;
  		else
  			return 0;
  	}
  
  	/* wrap-around case */
  	if ((bufnr >= start && bufnr <= QDIO_MAX_BUFFERS_PER_Q) ||
  	    (bufnr < end))
  		return 1;
  	else
  		return 0;
  }
  
  /**
   * handle_inbound - reset processed input buffers
   * @q: queue containing the buffers
   * @callflags: flags
   * @bufnr: first buffer to process
   * @count: how many buffers are emptied
   */
  static int handle_inbound(struct qdio_q *q, unsigned int callflags,
  			  int bufnr, int count)
  {
  	int used, diff;
  
  	qperf_inc(q, inbound_call);
  
  	if (!q->u.in.polling)
  		goto set;
  
  	/* protect against stop polling setting an ACK for an emptied slsb */
  	if (count == QDIO_MAX_BUFFERS_PER_Q) {
  		/* overwriting everything, just delete polling status */
  		q->u.in.polling = 0;
  		q->u.in.ack_count = 0;
  		goto set;
  	} else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {
  		if (is_qebsm(q)) {
  			/* partial overwrite, just update ack_start */
  			diff = add_buf(bufnr, count);
  			diff = sub_buf(diff, q->u.in.ack_start);
  			q->u.in.ack_count -= diff;
  			if (q->u.in.ack_count <= 0) {
  				q->u.in.polling = 0;
  				q->u.in.ack_count = 0;
  				goto set;
  			}
  			q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);
  		}
  		else
  			/* the only ACK will be deleted, so stop polling */
  			q->u.in.polling = 0;
  	}
  
  set:
  	count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
  
  	used = atomic_add_return(count, &q->nr_buf_used) - count;
  	BUG_ON(used + count > QDIO_MAX_BUFFERS_PER_Q);
  
  	if (need_siga_in(q))
  		return qdio_siga_input(q);
  
  	return 0;
  }
  
  /**
   * handle_outbound - process filled outbound buffers
   * @q: queue containing the buffers
   * @callflags: flags
   * @bufnr: first buffer to process
   * @count: how many buffers are filled
   */
  static int handle_outbound(struct qdio_q *q, unsigned int callflags,
  			   int bufnr, int count)
  {
  	unsigned char state = 0;
  	int used, rc = 0;
  
  	qperf_inc(q, outbound_call);
  
  	count = set_buf_states(q, bufnr, SLSB_CU_OUTPUT_PRIMED, count);
  	used = atomic_add_return(count, &q->nr_buf_used);
  	BUG_ON(used > QDIO_MAX_BUFFERS_PER_Q);
  
  	if (used == QDIO_MAX_BUFFERS_PER_Q)
  		qperf_inc(q, outbound_queue_full);
  
  	if (callflags & QDIO_FLAG_PCI_OUT) {
  		q->u.out.pci_out_enabled = 1;
  		qperf_inc(q, pci_request_int);
  	} else
  		q->u.out.pci_out_enabled = 0;
  
  	if (queue_type(q) == QDIO_IQDIO_QFMT) {
  		unsigned long phys_aob = 0;
  
  		/* One SIGA-W per buffer required for unicast HSI */
  		WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
  
  		phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
  
  		rc = qdio_kick_outbound_q(q, phys_aob);
  	} else if (need_siga_sync(q)) {
  		rc = qdio_siga_sync_q(q);
  	} else {
  		/* try to fast requeue buffers */
  		get_buf_state(q, prev_buf(bufnr), &state, 0);
  		if (state != SLSB_CU_OUTPUT_PRIMED)
  			rc = qdio_kick_outbound_q(q, 0);
  		else
  			qperf_inc(q, fast_requeue);
  	}
  
  	/* in case of SIGA errors we must process the error immediately */
  	if (used >= q->u.out.scan_threshold || rc)
  		tasklet_schedule(&q->tasklet);
  	else
  		/* free the SBALs in case of no further traffic */
  		if (!timer_pending(&q->u.out.timer))
  			mod_timer(&q->u.out.timer, jiffies + HZ);
  	return rc;
  }
  
  /**
   * do_QDIO - process input or output buffers
   * @cdev: associated ccw_device for the qdio subchannel
   * @callflags: input or output and special flags from the program
   * @q_nr: queue number
   * @bufnr: buffer number
   * @count: how many buffers to process
   */
  int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
  	    int q_nr, unsigned int bufnr, unsigned int count)
  {
  	struct qdio_irq *irq_ptr;
  
  
  	if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
  		return -EINVAL;
  
  	irq_ptr = cdev->private->qdio_data;
  	if (!irq_ptr)
  		return -ENODEV;
  
  	DBF_DEV_EVENT(DBF_INFO, irq_ptr,
  		      "do%02x b:%02x c:%02x", callflags, bufnr, count);
  
  	if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
  		return -EBUSY;
  	if (!count)
  		return 0;
  	if (callflags & QDIO_FLAG_SYNC_INPUT)
  		return handle_inbound(irq_ptr->input_qs[q_nr],
  				      callflags, bufnr, count);
  	else if (callflags & QDIO_FLAG_SYNC_OUTPUT)
  		return handle_outbound(irq_ptr->output_qs[q_nr],
  				       callflags, bufnr, count);
  	return -EINVAL;
  }
  EXPORT_SYMBOL_GPL(do_QDIO);
  
  /**
   * qdio_start_irq - process input buffers
   * @cdev: associated ccw_device for the qdio subchannel
   * @nr: input queue number
   *
   * Return codes
   *   0 - success
   *   1 - irqs not started since new data is available
   */
  int qdio_start_irq(struct ccw_device *cdev, int nr)
  {
  	struct qdio_q *q;
  	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
  
  	if (!irq_ptr)
  		return -ENODEV;
  	q = irq_ptr->input_qs[nr];
  
  	WARN_ON(queue_irqs_enabled(q));
  
  	clear_nonshared_ind(irq_ptr);
  	qdio_stop_polling(q);
  	clear_bit(QDIO_QUEUE_IRQS_DISABLED, &q->u.in.queue_irq_state);
  
  	/*
  	 * We need to check again to not lose initiative after
  	 * resetting the ACK state.
  	 */
  	if (test_nonshared_ind(irq_ptr))
  		goto rescan;
  	if (!qdio_inbound_q_done(q))
  		goto rescan;
  	return 0;
  
  rescan:
  	if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
  			     &q->u.in.queue_irq_state))
  		return 0;
  	else
  		return 1;
  
  }
  EXPORT_SYMBOL(qdio_start_irq);
  
  /**
   * qdio_get_next_buffers - process input buffers
   * @cdev: associated ccw_device for the qdio subchannel
   * @nr: input queue number
   * @bufnr: first filled buffer number
   * @error: buffers are in error state
   *
   * Return codes
   *   < 0 - error
   *   = 0 - no new buffers found
   *   > 0 - number of processed buffers
   */
  int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
  			  int *error)
  {
  	struct qdio_q *q;
  	int start, end;
  	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
  
  	if (!irq_ptr)
  		return -ENODEV;
  	q = irq_ptr->input_qs[nr];
  	WARN_ON(queue_irqs_enabled(q));
  
  	/*
  	 * Cannot rely on automatic sync after interrupt since queues may
  	 * also be examined without interrupt.
  	 */
  	if (need_siga_sync(q))
  		qdio_sync_queues(q);
  
  	/* check the PCI capable outbound queues. */
  	qdio_check_outbound_after_thinint(q);
  
  	if (!qdio_inbound_q_moved(q))
  		return 0;
  
  	/* Note: upper-layer MUST stop processing immediately here ... */
  	if (unlikely(q->irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
  		return -EIO;
  
  	start = q->first_to_kick;
  	end = q->first_to_check;
  	*bufnr = start;
  	*error = q->qdio_error;
  
  	/* for the next time */
  	q->first_to_kick = end;
  	q->qdio_error = 0;
  	return sub_buf(end, start);
  }
  EXPORT_SYMBOL(qdio_get_next_buffers);
  
  /**
   * qdio_stop_irq - disable interrupt processing for the device
   * @cdev: associated ccw_device for the qdio subchannel
   * @nr: input queue number
   *
   * Return codes
   *   0 - interrupts were already disabled
   *   1 - interrupts successfully disabled
   */
  int qdio_stop_irq(struct ccw_device *cdev, int nr)
  {
  	struct qdio_q *q;
  	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
  
  	if (!irq_ptr)
  		return -ENODEV;
  	q = irq_ptr->input_qs[nr];
  
  	if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
  			     &q->u.in.queue_irq_state))
  		return 0;
  	else
  		return 1;
  }
  EXPORT_SYMBOL(qdio_stop_irq);
  
  static int __init init_QDIO(void)
  {
  	int rc;
  
  	rc = qdio_debug_init();
  	if (rc)
  		return rc;
  	rc = qdio_setup_init();
  	if (rc)
  		goto out_debug;
  	rc = tiqdio_allocate_memory();
  	if (rc)
  		goto out_cache;
  	rc = tiqdio_register_thinints();
  	if (rc)
  		goto out_ti;
  	return 0;
  
  out_ti:
  	tiqdio_free_memory();
  out_cache:
  	qdio_setup_exit();
  out_debug:
  	qdio_debug_exit();
  	return rc;
  }
  
  static void __exit exit_QDIO(void)
  {
  	tiqdio_unregister_thinints();
  	tiqdio_free_memory();
  	qdio_setup_exit();
  	qdio_debug_exit();
  }
  
  module_init(init_QDIO);
  module_exit(exit_QDIO);
  