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s390/qdio: don't attempt IRQ avoidance on Output SBALs 

Output interrupts are not subject to SLSB-based avoidance, so remove the
gratuitous SLSB updates for Output SBALs in ERROR state.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Julian Wiedmann 2019-10-04 11:07:13 +02:00 committed by Vasily Gorbik
parent 94c43bdaa0
commit 6d76c898d8
1 changed files with 6 additions and 11 deletions
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17
drivers/s390/cio/qdio_main.c
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@ -423,9 +423,6 @@ static inline void account_sbals(struct qdio_q *q, unsigned int count)
static void process_buffer_error(struct qdio_q *q, unsigned int start,
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 */
@ -433,7 +430,7 @@ static void process_buffer_error(struct qdio_q *q, unsigned int start,
q->sbal[start]->element[15].sflags == 0x10) {
qperf_inc(q, target_full);
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "OUTFULL FTC:%02x", start);
goto set;
return;
}
DBF_ERROR("%4x BUF ERROR", SCH_NO(q));
@ -442,13 +439,6 @@ static void process_buffer_error(struct qdio_q *q, unsigned int start,
DBF_ERROR("F14:%2x F15:%2x",
q->sbal[start]->element[14].sflags,
q->sbal[start]->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, start, state, count);
}
static inline void inbound_primed(struct qdio_q *q, unsigned int start,
@ -530,6 +520,11 @@ static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start)
return count;
case SLSB_P_INPUT_ERROR:
process_buffer_error(q, start, count);
/*
* Interrupts may be avoided as long as the error is present
* so change the buffer state immediately to avoid starvation.
*/
set_buf_states(q, start, SLSB_P_INPUT_NOT_INIT, count);
if (atomic_sub_return(count, &q->nr_buf_used) == 0)
qperf_inc(q, inbound_queue_full);
if (q->irq_ptr->perf_stat_enabled)