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| author | Julian Wiedmann <jwi@linux.ibm.com> | 2020-04-21 10:38:18 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2020-05-20 10:22:50 +0200 |
| commit | c70d82e96644bd660ea53209c19f75cd86c560d6 (patch) | |
| tree | a36f9bbd30c61b5ef70ecd1b509b1c6dd43aa473 /drivers/s390 | |
| parent | 1db85d0e73f3b017c63afcdec1197d4d0736c362 (diff) | |
| download | linux-c70d82e96644bd660ea53209c19f75cd86c560d6.tar.bz2 | |
s390/qdio: add IRQ reduction for error SBALs
SBALs in PRIMED or ERROR state represent new work on the Input Queue.
But while inbound_primed() does all sorts of ACK management for new
PRIMED work, the same handling is currently missing for ERROR work.
In particular the path for ERROR work doesn't clear up _old_ ACKs.
Treat ERROR work the same as PRIMED work, but consider that the QEBSM
auto-ACK feature doesn't apply here. So we need to set the ACK manually,
as if it was a non-QEBSM device.
Note that this doesn't aspire to actually improve performance, the main
goal is to just unify the code paths and have consistent behaviour.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/cio/qdio_main.c | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c index eea3032e68c0..f5596265b053 100644 --- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -438,15 +438,12 @@ static void process_buffer_error(struct qdio_q *q, unsigned int start, q->sbal[start]->element[15].sflags); } -static inline void inbound_primed(struct qdio_q *q, unsigned int start, - int count) +static inline void inbound_handle_work(struct qdio_q *q, unsigned int start, + int count, bool auto_ack) { int new; - DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in prim:%1d %02x", q->nr, count); - - /* for QEBSM the ACK was already set by EQBS */ - if (is_qebsm(q)) { + if (auto_ack) { if (!q->u.in.ack_count) { q->u.in.ack_count = count; q->u.in.ack_start = start; @@ -507,19 +504,21 @@ static int get_inbound_buffer_frontier(struct qdio_q *q, unsigned int start) switch (state) { case SLSB_P_INPUT_PRIMED: - inbound_primed(q, start, count); + 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); + 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); + 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) |