Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1412 insertions, 0 deletions

diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c
new file mode 100644
index 0000000000..9cde55730b
--- /dev/null
+++ b/drivers/s390/cio/qdio_main.c
@@ -0,0 +1,1412 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Linux for s390 qdio support, buffer handling, qdio API and module support.
+ *
+ * Copyright IBM Corp. 2000, 2008
+ * 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/kmemleak.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 long out_mask, unsigned long in_mask,
+			       unsigned int fc)
+{
+	int cc;
+
+	asm volatile(
+		"	lgr	0,%[fc]\n"
+		"	lgr	1,%[schid]\n"
+		"	lgr	2,%[out]\n"
+		"	lgr	3,%[in]\n"
+		"	siga	0\n"
+		"	ipm	%[cc]\n"
+		"	srl	%[cc],28\n"
+		: [cc] "=&d" (cc)
+		: [fc] "d" (fc), [schid] "d" (schid),
+		  [out] "d" (out_mask), [in] "d" (in_mask)
+		: "cc", "0", "1", "2", "3");
+	return cc;
+}
+
+static inline int do_siga_input(unsigned long schid, unsigned long mask,
+				unsigned long fc)
+{
+	int cc;
+
+	asm volatile(
+		"	lgr	0,%[fc]\n"
+		"	lgr	1,%[schid]\n"
+		"	lgr	2,%[mask]\n"
+		"	siga	0\n"
+		"	ipm	%[cc]\n"
+		"	srl	%[cc],28\n"
+		: [cc] "=&d" (cc)
+		: [fc] "d" (fc), [schid] "d" (schid), [mask] "d" (mask)
+		: "cc", "0", "1", "2");
+	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
+ * @aob: asynchronous operation block
+ *
+ * Returns condition code.
+ * 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 long fc,
+				 unsigned long aob)
+{
+	int cc;
+
+	asm volatile(
+		"	lgr	0,%[fc]\n"
+		"	lgr	1,%[schid]\n"
+		"	lgr	2,%[mask]\n"
+		"	lgr	3,%[aob]\n"
+		"	siga	0\n"
+		"	lgr	%[fc],0\n"
+		"	ipm	%[cc]\n"
+		"	srl	%[cc],28\n"
+		: [cc] "=&d" (cc), [fc] "+&d" (fc)
+		: [schid] "d" (schid), [mask] "d" (mask), [aob] "d" (aob)
+		: "cc", "0", "1", "2", "3");
+	*bb = fc >> 31;
+	return cc;
+}
+
+/**
+ * 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 tmp_count = count, tmp_start = start, nr = q->nr;
+	unsigned int ccq = 0;
+
+	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);
+
+	switch (ccq) {
+	case 0:
+	case 32:
+		/* all done, or next buffer state different */
+		return count - tmp_count;
+	case 96:
+		/* not all buffers processed */
+		qperf_inc(q, eqbs_partial);
+		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "EQBS part:%02x",
+			tmp_count);
+		return count - tmp_count;
+	case 97:
+		/* no buffer processed */
+		DBF_DEV_EVENT(DBF_WARN, q->irq_ptr, "EQBS again:%2d", ccq);
+		goto again;
+	default:
+		DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
+		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_GET_BUF_STATE, q->nr,
+			   q->first_to_check, 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;
+
+	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);
+
+	switch (ccq) {
+	case 0:
+	case 32:
+		/* all done, or active buffer adapter-owned */
+		WARN_ON_ONCE(tmp_count);
+		return count - tmp_count;
+	case 96:
+		/* not all buffers processed */
+		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "SQBS again:%2d", ccq);
+		qperf_inc(q, sqbs_partial);
+		goto again;
+	default:
+		DBF_ERROR("%4x ccq:%3d", SCH_NO(q), ccq);
+		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_SET_BUF_STATE, q->nr,
+			   q->first_to_check, count, q->irq_ptr->int_parm);
+		return 0;
+	}
+}
+
+/*
+ * Returns number of examined buffers and their common state in *state.
+ * Requested number of buffers-to-examine must be > 0.
+ */
+static inline int get_buf_states(struct qdio_q *q, unsigned int bufnr,
+				 unsigned char *state, unsigned int count,
+				 int auto_ack)
+{
+	unsigned char __state = 0;
+	int i = 1;
+
+	if (is_qebsm(q))
+		return qdio_do_eqbs(q, state, bufnr, count, auto_ack);
+
+	/* get initial state: */
+	__state = q->slsb.val[bufnr];
+
+	/* Bail out early if there is no work on the queue: */
+	if (__state & SLSB_OWNER_CU)
+		goto out;
+
+	for (; i < count; i++) {
+		bufnr = next_buf(bufnr);
+
+		/* stop if next state differs from initial state: */
+		if (q->slsb.val[bufnr] != __state)
+			break;
+	}
+
+out:
+	*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);
+}
+
+/* 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;
+
+	if (is_qebsm(q))
+		return qdio_do_sqbs(q, state, bufnr, count);
+
+	/* Ensure that all preceding changes to the SBALs are visible: */
+	mb();
+
+	for (i = 0; i < count; i++) {
+		WRITE_ONCE(q->slsb.val[bufnr], state);
+		bufnr = next_buf(bufnr);
+	}
+
+	/* Make our SLSB changes visible: */
+	mb();
+
+	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) ? -EIO : 0;
+}
+
+static inline int qdio_sync_input_queue(struct qdio_q *q)
+{
+	return qdio_siga_sync(q, 0, q->mask);
+}
+
+static inline int qdio_sync_output_queue(struct qdio_q *q)
+{
+	return qdio_siga_sync(q, q->mask, 0);
+}
+
+static inline int qdio_siga_sync_q(struct qdio_q *q)
+{
+	if (q->is_input_q)
+		return qdio_sync_input_queue(q);
+	else
+		return qdio_sync_output_queue(q);
+}
+
+static int qdio_siga_output(struct qdio_q *q, unsigned int count,
+			    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;
+
+	if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) {
+		if (count > 1)
+			fc = QDIO_SIGA_WRITEM;
+		else if (aob)
+			fc = QDIO_SIGA_WRITEQ;
+	}
+
+	if (is_qebsm(q)) {
+		schid = q->irq_ptr->sch_token;
+		fc |= QDIO_SIGA_QEBSM_FLAG;
+	}
+again:
+	cc = do_siga_output(schid, q->mask, busy_bit, fc, aob);
+
+	/* hipersocket busy condition */
+	if (unlikely(*busy_bit)) {
+		retries++;
+
+		if (!start_time) {
+			start_time = get_tod_clock_fast();
+			goto again;
+		}
+		if (get_tod_clock_fast() - 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) ? -EIO : 0;
+}
+
+int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
+			unsigned char *state)
+{
+	if (qdio_need_siga_sync(q->irq_ptr))
+		qdio_siga_sync_q(q);
+	return get_buf_state(q, bufnr, state, 0);
+}
+
+static inline void qdio_stop_polling(struct qdio_q *q)
+{
+	if (!q->u.in.batch_count)
+		return;
+
+	qperf_inc(q, stop_polling);
+
+	/* show the card that we are not polling anymore */
+	set_buf_states(q, q->u.in.batch_start, SLSB_P_INPUT_NOT_INIT,
+		       q->u.in.batch_count);
+	q->u.in.batch_count = 0;
+}
+
+static inline void account_sbals(struct qdio_q *q, unsigned int count)
+{
+	q->q_stats.nr_sbal_total += count;
+	q->q_stats.nr_sbals[ilog2(count)]++;
+}
+
+static void process_buffer_error(struct qdio_q *q, unsigned int start,
+				 int count)
+{
+	/* special handling for no target buffer empty */
+	if (queue_type(q) == QDIO_IQDIO_QFMT && !q->is_input_q &&
+	    q->sbal[start]->element[15].sflags == 0x10) {
+		qperf_inc(q, target_full);
+		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start);
+		return;
+	}
+
+	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", start, count);
+	DBF_ERROR("F14:%2x F15:%2x",
+		  q->sbal[start]->element[14].sflags,
+		  q->sbal[start]->element[15].sflags);
+}
+
+static inline void inbound_handle_work(struct qdio_q *q, unsigned int start,
+				       int count, bool auto_ack)
+{
+	/* ACK the newest SBAL: */
+	if (!auto_ack)
+		set_buf_state(q, add_buf(start, count - 1), SLSB_P_INPUT_ACK);
+
+	if (!q->u.in.batch_count)
+		q->u.in.batch_start = start;
+	q->u.in.batch_count += count;
+}
+
+static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start,
+				       unsigned int *error)
+{
+	unsigned char state = 0;
+	int count;
+
+	q->timestamp = get_tod_clock_fast();
+
+	count = atomic_read(&q->nr_buf_used);
+	if (!count)
+		return 0;
+
+	if (qdio_need_siga_sync(q->irq_ptr))
+		qdio_sync_input_queue(q);
+
+	count = get_buf_states(q, start, &state, count, 1);
+	if (!count)
+		return 0;
+
+	switch (state) {
+	case SLSB_P_INPUT_PRIMED:
+		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr,
+			      count);
+
+		inbound_handle_work(q, start, count, is_qebsm(q));
+		if (atomic_sub_return(count, &q->nr_buf_used) == 0)
+			qperf_inc(q, inbound_queue_full);
+		if (q->irq_ptr->perf_stat_enabled)
+			account_sbals(q, count);
+		return count;
+	case SLSB_P_INPUT_ERROR:
+		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in err:%1d %02x", q->nr,
+			      count);
+
+		*error = QDIO_ERROR_SLSB_STATE;
+		process_buffer_error(q, start, count);
+		inbound_handle_work(q, start, count, false);
+		if (atomic_sub_return(count, &q->nr_buf_used) == 0)
+			qperf_inc(q, inbound_queue_full);
+		if (q->irq_ptr->perf_stat_enabled)
+			account_sbals_error(q, count);
+		return count;
+	case SLSB_CU_INPUT_EMPTY:
+		if (q->irq_ptr->perf_stat_enabled)
+			q->q_stats.nr_sbal_nop++;
+		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",
+			      q->nr, start);
+		return 0;
+	case SLSB_P_INPUT_NOT_INIT:
+	case SLSB_P_INPUT_ACK:
+		/* We should never see this state, throw a WARN: */
+	default:
+		dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
+			      "found state %#x at index %u on queue %u\n",
+			      state, start, q->nr);
+		return 0;
+	}
+}
+
+int qdio_inspect_input_queue(struct ccw_device *cdev, unsigned int nr,
+			     unsigned int *bufnr, unsigned int *error)
+{
+	struct qdio_irq *irq = cdev->private->qdio_data;
+	unsigned int start;
+	struct qdio_q *q;
+	int count;
+
+	if (!irq)
+		return -ENODEV;
+
+	q = irq->input_qs[nr];
+	start = q->first_to_check;
+	*error = 0;
+
+	count = get_inbound_buffer_frontier(q, start, error);
+	if (count == 0)
+		return 0;
+
+	*bufnr = start;
+	q->first_to_check = add_buf(start, count);
+	return count;
+}
+EXPORT_SYMBOL_GPL(qdio_inspect_input_queue);
+
+static inline int qdio_inbound_q_done(struct qdio_q *q, unsigned int start)
+{
+	unsigned char state = 0;
+
+	if (!atomic_read(&q->nr_buf_used))
+		return 1;
+
+	if (qdio_need_siga_sync(q->irq_ptr))
+		qdio_sync_input_queue(q);
+	get_buf_state(q, start, &state, 0);
+
+	if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
+		/* more work coming */
+		return 0;
+
+	return 1;
+}
+
+static int get_outbound_buffer_frontier(struct qdio_q *q, unsigned int start,
+					unsigned int *error)
+{
+	unsigned char state = 0;
+	int count;
+
+	q->timestamp = get_tod_clock_fast();
+
+	count = atomic_read(&q->nr_buf_used);
+	if (!count)
+		return 0;
+
+	if (qdio_need_siga_sync(q->irq_ptr))
+		qdio_sync_output_queue(q);
+
+	count = get_buf_states(q, start, &state, count, 0);
+	if (!count)
+		return 0;
+
+	switch (state) {
+	case SLSB_P_OUTPUT_PENDING:
+		*error = QDIO_ERROR_SLSB_PENDING;
+		fallthrough;
+	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);
+		if (q->irq_ptr->perf_stat_enabled)
+			account_sbals(q, count);
+		return count;
+	case SLSB_P_OUTPUT_ERROR:
+		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out error:%1d %02x",
+			      q->nr, count);
+
+		*error = QDIO_ERROR_SLSB_STATE;
+		process_buffer_error(q, start, count);
+		atomic_sub(count, &q->nr_buf_used);
+		if (q->irq_ptr->perf_stat_enabled)
+			account_sbals_error(q, count);
+		return count;
+	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);
+		return 0;
+	case SLSB_P_OUTPUT_HALTED:
+		return 0;
+	case SLSB_P_OUTPUT_NOT_INIT:
+		/* We should never see this state, throw a WARN: */
+	default:
+		dev_WARN_ONCE(&q->irq_ptr->cdev->dev, 1,
+			      "found state %#x at index %u on queue %u\n",
+			      state, start, q->nr);
+		return 0;
+	}
+}
+
+int qdio_inspect_output_queue(struct ccw_device *cdev, unsigned int nr,
+			      unsigned int *bufnr, unsigned int *error)
+{
+	struct qdio_irq *irq = cdev->private->qdio_data;
+	unsigned int start;
+	struct qdio_q *q;
+	int count;
+
+	if (!irq)
+		return -ENODEV;
+
+	q = irq->output_qs[nr];
+	start = q->first_to_check;
+	*error = 0;
+
+	count = get_outbound_buffer_frontier(q, start, error);
+	if (count == 0)
+		return 0;
+
+	*bufnr = start;
+	q->first_to_check = add_buf(start, count);
+	return count;
+}
+EXPORT_SYMBOL_GPL(qdio_inspect_output_queue);
+
+static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count,
+				unsigned long aob)
+{
+	int retries = 0, cc;
+	unsigned int busy_bit;
+
+	if (!qdio_need_siga_out(q->irq_ptr))
+		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, count, &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 = -EBUSY;
+		} else {
+			DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-w cc2:%1d", q->nr);
+			cc = -ENOBUFS;
+		}
+		break;
+	case 1:
+	case 3:
+		DBF_ERROR("%4x SIGA-W:%1d", SCH_NO(q), cc);
+		cc = -EIO;
+		break;
+	}
+	if (retries) {
+		DBF_ERROR("%4x cc2 BB2:%1d", SCH_NO(q), q->nr);
+		DBF_ERROR("count:%u", retries);
+	}
+	return cc;
+}
+
+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)
+{
+	if (unlikely(irq_ptr->state != QDIO_IRQ_STATE_ACTIVE))
+		return;
+
+	qdio_deliver_irq(irq_ptr);
+	irq_ptr->last_data_irq_time = S390_lowcore.int_clock;
+}
+
+static void qdio_handle_activate_check(struct qdio_irq *irq_ptr,
+				       unsigned long intparm, int cstat,
+				       int dstat)
+{
+	unsigned int first_to_check = 0;
+
+	DBF_ERROR("%4x ACT CHECK", irq_ptr->schid.sch_no);
+	DBF_ERROR("intp :%lx", intparm);
+	DBF_ERROR("ds: %2x cs:%2x", dstat, cstat);
+
+	/* zfcp wants this: */
+	if (irq_ptr->nr_input_qs)
+		first_to_check = irq_ptr->input_qs[0]->first_to_check;
+
+	irq_ptr->error_handler(irq_ptr->cdev, QDIO_ERROR_ACTIVATE, 0,
+			       first_to_check, 0, irq_ptr->int_parm);
+	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 qdio_irq *irq_ptr, int cstat,
+				      int dstat)
+{
+	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;
+	struct subchannel_id schid;
+	int cstat, dstat;
+
+	if (!intparm || !irq_ptr) {
+		ccw_device_get_schid(cdev, &schid);
+		DBF_ERROR("qint:%4x", schid.sch_no);
+		return;
+	}
+
+	if (irq_ptr->perf_stat_enabled)
+		irq_ptr->perf_stat.qdio_int++;
+
+	if (IS_ERR(irb)) {
+		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;
+	}
+	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(irq_ptr, 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(irq_ptr, intparm, cstat,
+						   dstat);
+		break;
+	case QDIO_IRQ_STATE_STOPPED:
+		break;
+	default:
+		WARN_ON_ONCE(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)
+{
+	struct subchannel_id schid;
+
+	if (!cdev || !cdev->private)
+		return -EINVAL;
+
+	ccw_device_get_schid(cdev, &schid);
+	DBF_EVENT("get ssqd:%4x", schid.sch_no);
+	return qdio_setup_get_ssqd(NULL, &schid, data);
+}
+EXPORT_SYMBOL_GPL(qdio_get_ssqd_desc);
+
+static int qdio_cancel_ccw(struct qdio_irq *irq, int how)
+{
+	struct ccw_device *cdev = irq->cdev;
+	long timeout;
+	int rc;
+
+	spin_lock_irq(get_ccwdev_lock(cdev));
+	qdio_set_state(irq, QDIO_IRQ_STATE_CLEANUP);
+	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);
+	spin_unlock_irq(get_ccwdev_lock(cdev));
+	if (rc) {
+		DBF_ERROR("%4x SHUTD ERR", irq->schid.sch_no);
+		DBF_ERROR("rc:%4d", rc);
+		return rc;
+	}
+
+	timeout = wait_event_interruptible_timeout(cdev->private->wait_q,
+						   irq->state == QDIO_IRQ_STATE_INACTIVE ||
+						   irq->state == QDIO_IRQ_STATE_ERR,
+						   10 * HZ);
+	if (timeout <= 0)
+		rc = (timeout == -ERESTARTSYS) ? -EINTR : -ETIME;
+
+	return rc;
+}
+
+/**
+ * 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;
+	struct subchannel_id schid;
+	int rc;
+
+	if (!irq_ptr)
+		return -ENODEV;
+
+	WARN_ON_ONCE(irqs_disabled());
+	ccw_device_get_schid(cdev, &schid);
+	DBF_EVENT("qshutdown:%4x", 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.
+	 */
+	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_STOPPED);
+
+	qdio_shutdown_debug_entries(irq_ptr);
+
+	rc = qdio_cancel_ccw(irq_ptr, how);
+	qdio_shutdown_thinint(irq_ptr);
+	qdio_shutdown_irq(irq_ptr);
+
+	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;
+	struct subchannel_id schid;
+
+	if (!irq_ptr)
+		return -ENODEV;
+
+	ccw_device_get_schid(cdev, &schid);
+	DBF_EVENT("qfree:%4x", schid.sch_no);
+	DBF_DEV_EVENT(DBF_ERR, irq_ptr, "dbf abandoned");
+	mutex_lock(&irq_ptr->setup_mutex);
+
+	irq_ptr->debug_area = NULL;
+	cdev->private->qdio_data = NULL;
+	mutex_unlock(&irq_ptr->setup_mutex);
+
+	qdio_free_queues(irq_ptr);
+	free_page((unsigned long) irq_ptr->qdr);
+	free_page(irq_ptr->chsc_page);
+	kfree(irq_ptr->ccw);
+	free_page((unsigned long) irq_ptr);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(qdio_free);
+
+/**
+ * qdio_allocate - allocate qdio queues and associated data
+ * @cdev: associated ccw device
+ * @no_input_qs: allocate this number of Input Queues
+ * @no_output_qs: allocate this number of Output Queues
+ */
+int qdio_allocate(struct ccw_device *cdev, unsigned int no_input_qs,
+		  unsigned int no_output_qs)
+{
+	struct subchannel_id schid;
+	struct qdio_irq *irq_ptr;
+	int rc = -ENOMEM;
+
+	ccw_device_get_schid(cdev, &schid);
+	DBF_EVENT("qallocate:%4x", schid.sch_no);
+
+	if (no_input_qs > QDIO_MAX_QUEUES_PER_IRQ ||
+	    no_output_qs > QDIO_MAX_QUEUES_PER_IRQ)
+		return -EINVAL;
+
+	irq_ptr = (void *) get_zeroed_page(GFP_KERNEL);
+	if (!irq_ptr)
+		return -ENOMEM;
+
+	irq_ptr->ccw = kmalloc(sizeof(*irq_ptr->ccw), GFP_KERNEL | GFP_DMA);
+	if (!irq_ptr->ccw)
+		goto err_ccw;
+
+	/* kmemleak doesn't scan the page-allocated irq_ptr: */
+	kmemleak_not_leak(irq_ptr->ccw);
+
+	irq_ptr->cdev = cdev;
+	mutex_init(&irq_ptr->setup_mutex);
+	if (qdio_allocate_dbf(irq_ptr))
+		goto err_dbf;
+
+	DBF_DEV_EVENT(DBF_ERR, irq_ptr, "alloc niq:%1u noq:%1u", no_input_qs,
+		      no_output_qs);
+
+	/*
+	 * 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 err_chsc;
+
+	/* 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 err_qdr;
+
+	rc = qdio_allocate_qs(irq_ptr, no_input_qs, no_output_qs);
+	if (rc)
+		goto err_queues;
+
+	cdev->private->qdio_data = irq_ptr;
+	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
+	return 0;
+
+err_queues:
+	free_page((unsigned long) irq_ptr->qdr);
+err_qdr:
+	free_page(irq_ptr->chsc_page);
+err_chsc:
+err_dbf:
+	kfree(irq_ptr->ccw);
+err_ccw:
+	free_page((unsigned long) irq_ptr);
+	return rc;
+}
+EXPORT_SYMBOL_GPL(qdio_allocate);
+
+static void qdio_trace_init_data(struct qdio_irq *irq,
+				 struct qdio_initialize *data)
+{
+	DBF_DEV_EVENT(DBF_ERR, irq, "qfmt:%1u", data->q_format);
+	DBF_DEV_EVENT(DBF_ERR, irq, "qpff%4x", data->qib_param_field_format);
+	DBF_DEV_HEX(irq, &data->qib_param_field, sizeof(void *), DBF_ERR);
+	DBF_DEV_EVENT(DBF_ERR, irq, "niq:%1u noq:%1u", data->no_input_qs,
+		      data->no_output_qs);
+	DBF_DEV_HEX(irq, &data->input_handler, sizeof(void *), DBF_ERR);
+	DBF_DEV_HEX(irq, &data->output_handler, sizeof(void *), DBF_ERR);
+	DBF_DEV_HEX(irq, &data->int_parm, sizeof(long), DBF_ERR);
+	DBF_DEV_HEX(irq, &data->input_sbal_addr_array, sizeof(void *), DBF_ERR);
+	DBF_DEV_HEX(irq, &data->output_sbal_addr_array, sizeof(void *),
+		    DBF_ERR);
+}
+
+/**
+ * qdio_establish - establish queues on a qdio subchannel
+ * @cdev: associated ccw device
+ * @init_data: initialization data
+ */
+int qdio_establish(struct ccw_device *cdev,
+		   struct qdio_initialize *init_data)
+{
+	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
+	struct subchannel_id schid;
+	struct ciw *ciw;
+	long timeout;
+	int rc;
+
+	ccw_device_get_schid(cdev, &schid);
+	DBF_EVENT("qestablish:%4x", schid.sch_no);
+
+	if (!irq_ptr)
+		return -ENODEV;
+
+	if (init_data->no_input_qs > irq_ptr->max_input_qs ||
+	    init_data->no_output_qs > irq_ptr->max_output_qs)
+		return -EINVAL;
+
+	/* Needed as error_handler: */
+	if (!init_data->input_handler)
+		return -EINVAL;
+
+	if (init_data->no_output_qs && !init_data->output_handler)
+		return -EINVAL;
+
+	if (!init_data->input_sbal_addr_array ||
+	    !init_data->output_sbal_addr_array)
+		return -EINVAL;
+
+	if (!init_data->irq_poll)
+		return -EINVAL;
+
+	ciw = ccw_device_get_ciw(cdev, CIW_TYPE_EQUEUE);
+	if (!ciw) {
+		DBF_ERROR("%4x NO EQ", schid.sch_no);
+		return -EIO;
+	}
+
+	mutex_lock(&irq_ptr->setup_mutex);
+	qdio_trace_init_data(irq_ptr, init_data);
+	qdio_setup_irq(irq_ptr, init_data);
+
+	rc = qdio_establish_thinint(irq_ptr);
+	if (rc)
+		goto err_thinint;
+
+	/* establish q */
+	irq_ptr->ccw->cmd_code = ciw->cmd;
+	irq_ptr->ccw->flags = CCW_FLAG_SLI;
+	irq_ptr->ccw->count = ciw->count;
+	irq_ptr->ccw->cda = (u32) virt_to_phys(irq_ptr->qdr);
+
+	spin_lock_irq(get_ccwdev_lock(cdev));
+	ccw_device_set_options_mask(cdev, 0);
+
+	rc = ccw_device_start(cdev, irq_ptr->ccw, QDIO_DOING_ESTABLISH, 0, 0);
+	spin_unlock_irq(get_ccwdev_lock(cdev));
+	if (rc) {
+		DBF_ERROR("%4x est IO ERR", irq_ptr->schid.sch_no);
+		DBF_ERROR("rc:%4x", rc);
+		goto err_ccw_start;
+	}
+
+	timeout = wait_event_interruptible_timeout(cdev->private->wait_q,
+						   irq_ptr->state == QDIO_IRQ_STATE_ESTABLISHED ||
+						   irq_ptr->state == QDIO_IRQ_STATE_ERR, HZ);
+	if (timeout <= 0) {
+		rc = (timeout == -ERESTARTSYS) ? -EINTR : -ETIME;
+		goto err_ccw_timeout;
+	}
+
+	if (irq_ptr->state != QDIO_IRQ_STATE_ESTABLISHED) {
+		rc = -EIO;
+		goto err_ccw_error;
+	}
+
+	qdio_setup_ssqd_info(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);
+	qdio_setup_debug_entries(irq_ptr);
+	return 0;
+
+err_ccw_timeout:
+	qdio_cancel_ccw(irq_ptr, QDIO_FLAG_CLEANUP_USING_CLEAR);
+err_ccw_error:
+err_ccw_start:
+	qdio_shutdown_thinint(irq_ptr);
+err_thinint:
+	qdio_shutdown_irq(irq_ptr);
+	qdio_set_state(irq_ptr, QDIO_IRQ_STATE_INACTIVE);
+	mutex_unlock(&irq_ptr->setup_mutex);
+	return rc;
+}
+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 = cdev->private->qdio_data;
+	struct subchannel_id schid;
+	struct ciw *ciw;
+	int rc;
+
+	ccw_device_get_schid(cdev, &schid);
+	DBF_EVENT("qactivate:%4x", schid.sch_no);
+
+	if (!irq_ptr)
+		return -ENODEV;
+
+	ciw = ccw_device_get_ciw(cdev, CIW_TYPE_AQUEUE);
+	if (!ciw) {
+		DBF_ERROR("%4x NO AQ", schid.sch_no);
+		return -EIO;
+	}
+
+	mutex_lock(&irq_ptr->setup_mutex);
+	if (irq_ptr->state == QDIO_IRQ_STATE_INACTIVE) {
+		rc = -EBUSY;
+		goto out;
+	}
+
+	irq_ptr->ccw->cmd_code = ciw->cmd;
+	irq_ptr->ccw->flags = CCW_FLAG_SLI;
+	irq_ptr->ccw->count = ciw->count;
+	irq_ptr->ccw->cda = 0;
+
+	spin_lock_irq(get_ccwdev_lock(cdev));
+	ccw_device_set_options(cdev, CCWDEV_REPORT_ALL);
+
+	rc = ccw_device_start(cdev, irq_ptr->ccw, QDIO_DOING_ACTIVATE,
+			      0, DOIO_DENY_PREFETCH);
+	spin_unlock_irq(get_ccwdev_lock(cdev));
+	if (rc) {
+		DBF_ERROR("%4x act IO ERR", irq_ptr->schid.sch_no);
+		DBF_ERROR("rc:%4x", rc);
+		goto out;
+	}
+
+	/* 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);
+
+/**
+ * handle_inbound - reset processed input buffers
+ * @q: queue containing the buffers
+ * @bufnr: first buffer to process
+ * @count: how many buffers are emptied
+ */
+static int handle_inbound(struct qdio_q *q, int bufnr, int count)
+{
+	int overlap;
+
+	qperf_inc(q, inbound_call);
+
+	/* If any processed SBALs are returned to HW, adjust our tracking: */
+	overlap = min_t(int, count - sub_buf(q->u.in.batch_start, bufnr),
+			     q->u.in.batch_count);
+	if (overlap > 0) {
+		q->u.in.batch_start = add_buf(q->u.in.batch_start, overlap);
+		q->u.in.batch_count -= overlap;
+	}
+
+	count = set_buf_states(q, bufnr, SLSB_CU_INPUT_EMPTY, count);
+	atomic_add(count, &q->nr_buf_used);
+
+	if (qdio_need_siga_in(q->irq_ptr))
+		return qdio_siga_input(q);
+
+	return 0;
+}
+
+/**
+ * qdio_add_bufs_to_input_queue - process buffers on an Input Queue
+ * @cdev: associated ccw_device for the qdio subchannel
+ * @q_nr: queue number
+ * @bufnr: buffer number
+ * @count: how many buffers to process
+ */
+int qdio_add_bufs_to_input_queue(struct ccw_device *cdev, unsigned int q_nr,
+				 unsigned int bufnr, unsigned int count)
+{
+	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
+
+	if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
+		return -EINVAL;
+
+	if (!irq_ptr)
+		return -ENODEV;
+
+	DBF_DEV_EVENT(DBF_INFO, irq_ptr, "addi b:%02x c:%02x", bufnr, count);
+
+	if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
+		return -EIO;
+	if (!count)
+		return 0;
+
+	return handle_inbound(irq_ptr->input_qs[q_nr], bufnr, count);
+}
+EXPORT_SYMBOL_GPL(qdio_add_bufs_to_input_queue);
+
+/**
+ * handle_outbound - process filled outbound buffers
+ * @q: queue containing the buffers
+ * @bufnr: first buffer to process
+ * @count: how many buffers are filled
+ * @aob: asynchronous operation block
+ */
+static int handle_outbound(struct qdio_q *q, unsigned int bufnr, unsigned int count,
+			   struct qaob *aob)
+{
+	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);
+
+	if (used == QDIO_MAX_BUFFERS_PER_Q)
+		qperf_inc(q, outbound_queue_full);
+
+	if (queue_type(q) == QDIO_IQDIO_QFMT) {
+		unsigned long phys_aob = aob ? virt_to_phys(aob) : 0;
+
+		WARN_ON_ONCE(!IS_ALIGNED(phys_aob, 256));
+		rc = qdio_kick_outbound_q(q, count, phys_aob);
+	} else if (qdio_need_siga_sync(q->irq_ptr)) {
+		rc = qdio_sync_output_queue(q);
+	} else if (count < QDIO_MAX_BUFFERS_PER_Q &&
+		   get_buf_state(q, prev_buf(bufnr), &state, 0) > 0 &&
+		   state == SLSB_CU_OUTPUT_PRIMED) {
+		/* The previous buffer is not processed yet, tack on. */
+		qperf_inc(q, fast_requeue);
+	} else {
+		rc = qdio_kick_outbound_q(q, count, 0);
+	}
+
+	return rc;
+}
+
+/**
+ * qdio_add_bufs_to_output_queue - process buffers on an Output Queue
+ * @cdev: associated ccw_device for the qdio subchannel
+ * @q_nr: queue number
+ * @bufnr: buffer number
+ * @count: how many buffers to process
+ * @aob: asynchronous operation block
+ */
+int qdio_add_bufs_to_output_queue(struct ccw_device *cdev, unsigned int q_nr,
+				  unsigned int bufnr, unsigned int count,
+				  struct qaob *aob)
+{
+	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
+
+	if (bufnr >= QDIO_MAX_BUFFERS_PER_Q || count > QDIO_MAX_BUFFERS_PER_Q)
+		return -EINVAL;
+
+	if (!irq_ptr)
+		return -ENODEV;
+
+	DBF_DEV_EVENT(DBF_INFO, irq_ptr, "addo b:%02x c:%02x", bufnr, count);
+
+	if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
+		return -EIO;
+	if (!count)
+		return 0;
+
+	return handle_outbound(irq_ptr->output_qs[q_nr], bufnr, count, aob);
+}
+EXPORT_SYMBOL_GPL(qdio_add_bufs_to_output_queue);
+
+/**
+ * qdio_start_irq - enable interrupt processing for the device
+ * @cdev: associated ccw_device for the qdio subchannel
+ *
+ * Return codes
+ *   0 - success
+ *   1 - irqs not started since new data is available
+ */
+int qdio_start_irq(struct ccw_device *cdev)
+{
+	struct qdio_q *q;
+	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
+	unsigned int i;
+
+	if (!irq_ptr)
+		return -ENODEV;
+
+	for_each_input_queue(irq_ptr, q, i)
+		qdio_stop_polling(q);
+
+	clear_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state);
+
+	/*
+	 * We need to check again to not lose initiative after
+	 * resetting the ACK state.
+	 */
+	if (test_nonshared_ind(irq_ptr))
+		goto rescan;
+
+	for_each_input_queue(irq_ptr, q, i) {
+		if (!qdio_inbound_q_done(q, q->first_to_check))
+			goto rescan;
+	}
+
+	return 0;
+
+rescan:
+	if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_state))
+		return 0;
+	else
+		return 1;
+
+}
+EXPORT_SYMBOL(qdio_start_irq);
+
+/**
+ * qdio_stop_irq - disable interrupt processing for the device
+ * @cdev: associated ccw_device for the qdio subchannel
+ *
+ * Return codes
+ *   0 - interrupts were already disabled
+ *   1 - interrupts successfully disabled
+ */
+int qdio_stop_irq(struct ccw_device *cdev)
+{
+	struct qdio_irq *irq_ptr = cdev->private->qdio_data;
+
+	if (!irq_ptr)
+		return -ENODEV;
+
+	if (test_and_set_bit(QDIO_IRQ_DISABLED, &irq_ptr->poll_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 = qdio_thinint_init();
+	if (rc)
+		goto out_cache;
+	return 0;
+
+out_cache:
+	qdio_setup_exit();
+out_debug:
+	qdio_debug_exit();
+	return rc;
+}
+
+static void __exit exit_QDIO(void)
+{
+	qdio_thinint_exit();
+	qdio_setup_exit();
+	qdio_debug_exit();
+}
+
+module_init(init_QDIO);
+module_exit(exit_QDIO);