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s390/qdio: implement IQD Multi-Write 

This allows IQD drivers to send out multiple SBALs with a single SIGA
instruction.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Alexandra Winter <wintera@linux.ibm.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julian Wiedmann 2019-10-31 13:42:14 +01:00 committed by David S. Miller
parent 4a956bd22b
commit b7f143d093
2 changed files with 16 additions and 16 deletions
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1
drivers/s390/cio/qdio.h
View File

@ -82,6 +82,7 @@ enum qdio_irq_states {
#define QDIO_SIGA_WRITE 0x00
#define QDIO_SIGA_READ 0x01
#define QDIO_SIGA_SYNC 0x02
#define QDIO_SIGA_WRITEM 0x03
#define QDIO_SIGA_WRITEQ 0x04
#define QDIO_SIGA_QEBSM_FLAG 0x80

29
drivers/s390/cio/qdio_main.c
View File

@ -310,18 +310,19 @@ static inline int qdio_siga_sync_q(struct qdio_q *q)
return qdio_siga_sync(q, q->mask, 0);
}
static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
unsigned long aob)
static int qdio_siga_output(struct qdio_q *q, unsigned int count,
unsigned int *busy_bit, unsigned long aob)
{
unsigned long schid = *((u32 *) &q->irq_ptr->schid);
unsigned int fc = QDIO_SIGA_WRITE;
u64 start_time = 0;
int retries = 0, cc;
unsigned long laob = 0;
if (aob) {
if (queue_type(q) == QDIO_IQDIO_QFMT && !multicast_outbound(q)) {
if (count > 1)
fc = QDIO_SIGA_WRITEM;
else if (aob)
fc = QDIO_SIGA_WRITEQ;
laob = aob;
}
if (is_qebsm(q)) {
@ -329,7 +330,7 @@ static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit,
fc |= QDIO_SIGA_QEBSM_FLAG;
}
again:
cc = do_siga_output(schid, q->mask, busy_bit, fc, laob);
cc = do_siga_output(schid, q->mask, busy_bit, fc, aob);
/* hipersocket busy condition */
if (unlikely(*busy_bit)) {
@ -781,7 +782,8 @@ static inline int qdio_outbound_q_moved(struct qdio_q *q, unsigned int start)
return count;
}
static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
static int qdio_kick_outbound_q(struct qdio_q *q, unsigned int count,
unsigned long aob)
{
int retries = 0, cc;
unsigned int busy_bit;
@ -793,7 +795,7 @@ static int qdio_kick_outbound_q(struct qdio_q *q, unsigned long aob)
retry:
qperf_inc(q, siga_write);
cc = qdio_siga_output(q, &busy_bit, aob);
cc = qdio_siga_output(q, count, &busy_bit, aob);
switch (cc) {
case 0:
break;
@ -1526,7 +1528,7 @@ set:
* @count: how many buffers are filled
*/
static int handle_outbound(struct qdio_q *q, unsigned int callflags,
int bufnr, int count)
unsigned int bufnr, unsigned int count)
{
const unsigned int scan_threshold = q->irq_ptr->scan_threshold;
unsigned char state = 0;
@ -1549,13 +1551,10 @@ static int handle_outbound(struct qdio_q *q, unsigned int callflags,
if (queue_type(q) == QDIO_IQDIO_QFMT) {
unsigned long phys_aob = 0;
/* One SIGA-W per buffer required for unicast HSI */
WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
if (q->u.out.use_cq)
if (q->u.out.use_cq && count == 1)
phys_aob = qdio_aob_for_buffer(&q->u.out, bufnr);
rc = qdio_kick_outbound_q(q, phys_aob);
rc = qdio_kick_outbound_q(q, count, phys_aob);
} else if (need_siga_sync(q)) {
rc = qdio_siga_sync_q(q);
} else if (count < QDIO_MAX_BUFFERS_PER_Q &&
@ -1564,7 +1563,7 @@ static int handle_outbound(struct qdio_q *q, unsigned int callflags,
/* The previous buffer is not processed yet, tack on. */
qperf_inc(q, fast_requeue);
} else {
rc = qdio_kick_outbound_q(q, 0);
rc = qdio_kick_outbound_q(q, count, 0);
}
/* Let drivers implement their own completion scanning: */