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s390/qdio: restrict QAOB usage to IQD unicast queues

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The IQD mcast queue doesn't support QAOB mode, so skip the
qdio_enable_async_operation() setup call for this queue. This avoids
the allocation of an unneeded QAOB pointer array, and sets up q->use_cq
properly so that drivers are prohibited from using QAOBs for mcast
traffic.

Take this opportunity to streamline the q->use_cq and aob != 0 checks.
The path to qdio_siga_output() is straight-forward, we don't need to
worry about being called with bad operands.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Julian Wiedmann 2019-07-01 14:19:29 +02:00 committed by Heiko Carstens
parent a6ec414a4d
commit 69e96207eb
1 changed files with 5 additions and 7 deletions
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12
drivers/s390/cio/qdio_main.c
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@ -319,9 +319,7 @@ static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
int retries = 0, cc;
unsigned long laob = 0;
WARN_ON_ONCE(aob && ((queue_type(q) != QDIO_IQDIO_QFMT) ||
!q->u.out.use_cq));
if (q->u.out.use_cq && aob != 0) {
if (aob) {
fc = QDIO_SIGA_WRITEQ;
laob = aob;
}
@ -621,9 +619,6 @@ static inline unsigned long qdio_aob_for_buffer(struct qdio_output_q *q,
{
unsigned long phys_aob = 0;
if (!q->use_cq)
return 0;
if (!q->aobs[bufnr]) {
struct qaob *aob = qdio_allocate_aob();
q->aobs[bufnr] = aob;
@ -1308,6 +1303,8 @@ static void qdio_detect_hsicq(struct qdio_irq *irq_ptr)
for_each_output_queue(irq_ptr, q, i) {
if (use_cq) {
if (multicast_outbound(q))
continue;
if (qdio_enable_async_operation(&q->u.out) < 0) {
use_cq = 0;
continue;
@ -1553,7 +1550,8 @@ static int handle_outbound(struct qdio_q *q, unsigned int callflags,
/* One SIGA-W per buffer required for unicast HSI */
WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
if (q->u.out.use_cq)
phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
rc = qdio_kick_outbound_q(q, phys_aob);
} else if (need_siga_sync(q)) {