Commit b39544c6 authored by Julian Wiedmann's avatar Julian Wiedmann Committed by Martin Schwidefsky
Browse files

s390/qdio: pass up count of ready-to-process SBALs 



When qdio_{in,out}bound_q_moved() scans a queue for pending work, it
currently only returns a boolean to its caller. The interface to the
upper-layer-drivers (qdio_kick_handler() and qdio_get_next_buffers())
then re-calculates the number of pending SBALs from the
q->first_to_check and q->first_to_kick cursors.

Refactor this so that whenever get_{in,out}bound_buffer_frontier()
adjusted the queue's first_to_check cursor, it also returns the
corresponding count of ready-to-process SBALs (and 0 else).
A subsequent patch will then make use of this additional information.

Signed-off-by: default avatarJulian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: default avatarJens Remus <jremus@linux.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 34298422

drivers/s390/cio/qdio_main.c

+42 −35
Original line number Diff line number Diff line
@@ -504,7 +504,7 @@ static int get_inbound_buffer_frontier(struct qdio_q *q) 
	 */

	count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);

	if (!count)

		goto out;

		return 0;



	/*

	 * No siga sync here, as a PCI or we after a thin interrupt
@@ -512,7 +512,7 @@ static int get_inbound_buffer_frontier(struct qdio_q *q) 
	 */

	count = get_buf_states(q, q->first_to_check, &state, count, 1, 0);

	if (!count)

		goto out;

		return 0;



	switch (state) {

	case SLSB_P_INPUT_PRIMED:
@@ -522,7 +522,7 @@ static int get_inbound_buffer_frontier(struct qdio_q *q) 
			qperf_inc(q, inbound_queue_full);

		if (q->irq_ptr->perf_stat_enabled)

			account_sbals(q, count);

		break;

		return count;

	case SLSB_P_INPUT_ERROR:

		process_buffer_error(q, count);

		q->first_to_check = add_buf(q->first_to_check, count);
@@ -530,7 +530,7 @@ static int get_inbound_buffer_frontier(struct qdio_q *q) 
			qperf_inc(q, inbound_queue_full);

		if (q->irq_ptr->perf_stat_enabled)

			account_sbals_error(q, count);

		break;

		return count;

	case SLSB_CU_INPUT_EMPTY:

	case SLSB_P_INPUT_NOT_INIT:

	case SLSB_P_INPUT_ACK:
@@ -538,27 +538,26 @@ static int get_inbound_buffer_frontier(struct qdio_q *q) 
			q->q_stats.nr_sbal_nop++;

		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in nop:%1d %#02x",

			q->nr, q->first_to_check);

		break;

		return 0;

	default:

		WARN_ON_ONCE(1);

		return 0;

	}

out:

	return q->first_to_check;

}



static int qdio_inbound_q_moved(struct qdio_q *q)

{

	int bufnr;

	int count;



	bufnr = get_inbound_buffer_frontier(q);

	count = get_inbound_buffer_frontier(q);



	if (bufnr != q->last_move) {

		q->last_move = bufnr;

	if (count) {

		q->last_move = q->first_to_check;

		if (!is_thinint_irq(q->irq_ptr) && MACHINE_IS_LPAR)

			q->u.in.timestamp = get_tod_clock();

		return 1;

	} else

		return 0;

	}



	return count;

}



static inline int qdio_inbound_q_done(struct qdio_q *q)
@@ -678,9 +677,12 @@ static inline int qdio_tasklet_schedule(struct qdio_q *q) 


static void __qdio_inbound_processing(struct qdio_q *q)

{

	int count;



	qperf_inc(q, tasklet_inbound);



	if (!qdio_inbound_q_moved(q))

	count = qdio_inbound_q_moved(q);

	if (count == 0)

		return;



	qdio_kick_handler(q);
@@ -729,12 +731,12 @@ static int get_outbound_buffer_frontier(struct qdio_q *q) 
	 */

	count = min(atomic_read(&q->nr_buf_used), QDIO_MAX_BUFFERS_MASK);

	if (!count)

		goto out;

		return 0;



	count = get_buf_states(q, q->first_to_check, &state, count, 0,

			       q->u.out.use_cq);

	if (!count)

		goto out;

		return 0;



	switch (state) {

	case SLSB_P_OUTPUT_EMPTY:
@@ -746,31 +748,28 @@ static int get_outbound_buffer_frontier(struct qdio_q *q) 
		q->first_to_check = add_buf(q->first_to_check, count);

		if (q->irq_ptr->perf_stat_enabled)

			account_sbals(q, count);



		break;

		return count;

	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;

		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);

		break;

		return 0;

	case SLSB_P_OUTPUT_NOT_INIT:

	case SLSB_P_OUTPUT_HALTED:

		break;

		return 0;

	default:

		WARN_ON_ONCE(1);

		return 0;

	}



out:

	return q->first_to_check;

}



/* all buffers processed? */
@@ -781,16 +780,16 @@ static inline int qdio_outbound_q_done(struct qdio_q *q) 


static inline int qdio_outbound_q_moved(struct qdio_q *q)

{

	int bufnr;

	int count;



	bufnr = get_outbound_buffer_frontier(q);

	count = get_outbound_buffer_frontier(q);



	if (bufnr != q->last_move) {

		q->last_move = bufnr;

	if (count) {

		q->last_move = q->first_to_check;

		DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "out moved:%1d", q->nr);

		return 1;

	} else

		return 0;

	}



	return count;

}



static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
@@ -837,10 +836,13 @@ retry: 


static void __qdio_outbound_processing(struct qdio_q *q)

{

	int count;



	qperf_inc(q, tasklet_outbound);

	WARN_ON_ONCE(atomic_read(&q->nr_buf_used) < 0);



	if (qdio_outbound_q_moved(q))

	count = qdio_outbound_q_moved(q);

	if (count)

		qdio_kick_handler(q);



	if (queue_type(q) == QDIO_ZFCP_QFMT && !pci_out_supported(q->irq_ptr) &&
@@ -896,6 +898,8 @@ static inline void qdio_check_outbound_pci_queues(struct qdio_irq *irq) 


static void __tiqdio_inbound_processing(struct qdio_q *q)

{

	int count;



	qperf_inc(q, tasklet_inbound);

	if (need_siga_sync(q) && need_siga_sync_after_ai(q))

		qdio_sync_queues(q);
@@ -903,7 +907,8 @@ static void __tiqdio_inbound_processing(struct qdio_q *q) 
	/* The interrupt could be caused by a PCI request: */

	qdio_check_outbound_pci_queues(q->irq_ptr);



	if (!qdio_inbound_q_moved(q))

	count = qdio_inbound_q_moved(q);

	if (count == 0)

		return;



	qdio_kick_handler(q);
@@ -1671,6 +1676,7 @@ int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, 
	struct qdio_q *q;

	int start, end;

	struct qdio_irq *irq_ptr = cdev->private->qdio_data;

	int count;



	if (!irq_ptr)

		return -ENODEV;
@@ -1685,7 +1691,8 @@ int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr, 


	qdio_check_outbound_pci_queues(irq_ptr);



	if (!qdio_inbound_q_moved(q))

	count = qdio_inbound_q_moved(q);

	if (count == 0)

		return 0;



	/* Note: upper-layer MUST stop processing immediately here ... */

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