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[S390] qdio enhanced SIGA (iqdio) support.

Browse source 
Add support for z10 HiperSockets multiwrite SBALs on output
queues. This is used on LPAR with EDDP enabled devices.

Signed-off-by: Klaus-Dieter Wacker <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Klaus-Dieter Wacker 2008-10-10 21:33:18 +02:00 • committed by Martin Schwidefsky
commit 7a0f475513
3 changed files with 29 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

3
drivers/s390/cio/qdio.h
View file

@ -203,6 +203,9 @@ struct qdio_output_q {
/* PCIs are enabled for the queue */
int pci_out_enabled;
/* IQDIO: output multiple buffers (enhanced SIGA) */
int use_enh_siga;
/* timer to check for more outbound work */
struct timer_list timer;
};

24
drivers/s390/cio/qdio_main.c
View file

@ -316,6 +316,9 @@ static inline int qdio_do_siga_output(struct qdio_q *q, unsigned int *busy_bit)
unsigned int fc = 0;
unsigned long schid;
if (q->u.out.use_enh_siga) {
fc = 3;
}
if (!is_qebsm(q))
schid = *((u32 *)&q->irq_ptr->schid);
else {
@ -1449,6 +1452,8 @@ int qdio_establish(struct qdio_initialize *init_data)
}
qdio_setup_ssqd_info(irq_ptr);
sprintf(dbf_text, "qDmmwc%2x", irq_ptr->ssqd_desc.mmwc);
QDIO_DBF_TEXT2(0, setup, dbf_text);
sprintf(dbf_text, "qib ac%2x", irq_ptr->qib.ac);
QDIO_DBF_TEXT2(0, setup, dbf_text);
@ -1621,12 +1626,21 @@ static void handle_outbound(struct qdio_q *q, unsigned int callflags,
if (multicast_outbound(q))
qdio_kick_outbound_q(q);
else
/*
* One siga-w per buffer required for unicast
* HiperSockets.
*/
while (count--)
if ((q->irq_ptr->ssqd_desc.mmwc > 1) &&
(count > 1) &&
(count <= q->irq_ptr->ssqd_desc.mmwc)) {
/* exploit enhanced SIGA */
q->u.out.use_enh_siga = 1;
qdio_kick_outbound_q(q);
} else {
/*
* One siga-w per buffer required for unicast
* HiperSockets.
*/
q->u.out.use_enh_siga = 0;
while (count--)
qdio_kick_outbound_q(q);
}
goto out;
}