Commit e85dea0e authored by Jan Glauber's avatar Jan Glauber Committed by Martin Schwidefsky
Browse files

[S390] qdio: seperate last move index and polling index 



The index value that indicated that the input queue moved was also used to
store the index of the first acknowledged buffer. For non-qebsm only the
newest buffer is acknowledged which may be different from the last move index
so two seperate values are needed to track the input queue.

Signed-off-by: default avatarJan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 3fdf1e18

drivers/s390/cio/qdio.h

+4 −1
Original line number Diff line number Diff line
@@ -186,6 +186,9 @@ struct qdio_input_q { 
	/* input buffer acknowledgement flag */

	int polling;



	/* first ACK'ed buffer */

	int ack_start;



	/* how much sbals are acknowledged with qebsm */

	int ack_count;
@@ -234,7 +237,7 @@ struct qdio_q { 
	int first_to_check;



	/* first_to_check of the last time */

	int last_move_ftc;

	int last_move;



	/* beginning position for calling the program */

	int first_to_kick;

drivers/s390/cio/qdio_debug.c

+2 −1
Original line number Diff line number Diff line
@@ -63,8 +63,9 @@ static int qstat_show(struct seq_file *m, void *v) 
	seq_printf(m, "device state indicator: %d\n", *(u32 *)q->irq_ptr->dsci);

	seq_printf(m, "nr_used: %d\n", atomic_read(&q->nr_buf_used));

	seq_printf(m, "ftc: %d\n", q->first_to_check);

	seq_printf(m, "last_move_ftc: %d\n", q->last_move_ftc);

	seq_printf(m, "last_move: %d\n", q->last_move);

	seq_printf(m, "polling: %d\n", q->u.in.polling);

	seq_printf(m, "ack start: %d\n", q->u.in.ack_start);

	seq_printf(m, "ack count: %d\n", q->u.in.ack_count);

	seq_printf(m, "slsb buffer states:\n");

	seq_printf(m, "|0      |8      |16     |24     |32     |40     |48     |56  63|\n");

drivers/s390/cio/qdio_main.c

+17 −21
Original line number Diff line number Diff line
@@ -380,11 +380,11 @@ inline void qdio_stop_polling(struct qdio_q *q) 


	/* show the card that we are not polling anymore */

	if (is_qebsm(q)) {

		set_buf_states(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT,

		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->last_move_ftc, SLSB_P_INPUT_NOT_INIT);

		set_buf_state(q, q->u.in.ack_start, SLSB_P_INPUT_NOT_INIT);

}



static void announce_buffer_error(struct qdio_q *q, int count)
@@ -419,15 +419,15 @@ static inline void inbound_primed(struct qdio_q *q, int count) 
		if (!q->u.in.polling) {

			q->u.in.polling = 1;

			q->u.in.ack_count = count;

			q->last_move_ftc = q->first_to_check;

			q->u.in.ack_start = q->first_to_check;

			return;

		}



		/* delete the previous ACK's */

		set_buf_states(q, q->last_move_ftc, SLSB_P_INPUT_NOT_INIT,

		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->last_move_ftc = q->first_to_check;

		q->u.in.ack_start = q->first_to_check;

		return;

	}
@@ -439,18 +439,13 @@ static inline void inbound_primed(struct qdio_q *q, int count) 
	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->last_move_ftc, SLSB_P_INPUT_NOT_INIT);

		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);

	}



	/*

	 * last_move_ftc points to the ACK'ed buffer and not to the last turns

	 * first_to_check like for qebsm. Since it is only used to check if

	 * the queue front moved in qdio_inbound_q_done this is not a problem.

	 */

	q->last_move_ftc = new;

	q->u.in.ack_start = new;

	count--;

	if (!count)

		return;
@@ -527,7 +522,8 @@ int qdio_inbound_q_moved(struct qdio_q *q) 


	bufnr = get_inbound_buffer_frontier(q);



	if ((bufnr != q->last_move_ftc) || q->qdio_error) {

	if ((bufnr != q->last_move) || q->qdio_error) {

		q->last_move = bufnr;

		if (!need_siga_sync(q) && !pci_out_supported(q))

			q->u.in.timestamp = get_usecs();
@@ -702,8 +698,8 @@ static inline int qdio_outbound_q_moved(struct qdio_q *q) 


	bufnr = get_outbound_buffer_frontier(q);



	if ((bufnr != q->last_move_ftc) || q->qdio_error) {

		q->last_move_ftc = bufnr;

	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
@@ -748,7 +744,7 @@ static void qdio_kick_outbound_handler(struct qdio_q *q) 
	int start, end, count;



	start = q->first_to_kick;

	end = q->last_move_ftc;

	end = q->last_move;

	if (end >= start)

		count = end - start;

	else
@@ -764,7 +760,7 @@ static void qdio_kick_outbound_handler(struct qdio_q *q) 
		   q->irq_ptr->int_parm);



	/* for the next time: */

	q->first_to_kick = q->last_move_ftc;

	q->first_to_kick = q->last_move;

	q->qdio_error = 0;

}
@@ -1475,18 +1471,18 @@ static void handle_inbound(struct qdio_q *q, unsigned int callflags, 
		q->u.in.polling = 0;

		q->u.in.ack_count = 0;

		goto set;

	} else if (buf_in_between(q->last_move_ftc, bufnr, count)) {

	} else if (buf_in_between(q->u.in.ack_start, bufnr, count)) {

		if (is_qebsm(q)) {

			/* partial overwrite, just update last_move_ftc */

			/* partial overwrite, just update ack_start */

			diff = add_buf(bufnr, count);

			diff = sub_buf(diff, q->last_move_ftc);

			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->last_move_ftc = add_buf(q->last_move_ftc, diff);

			q->u.in.ack_start = add_buf(q->u.in.ack_start, diff);

		}

		else

			/* the only ACK will be deleted, so stop polling */

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