diff options
| author | Klaus-Dieter Wacker <kdwacker@de.ibm.com> | 2008-10-10 21:33:18 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-10-10 21:33:55 +0200 |
| commit | 7a0f475513fa573bc8e072021960313da32f0ee3 (patch) | |
| tree | 397d3d7862d793261a08c7a742101672fd3d7980 /drivers/s390 | |
| parent | b1e766137fe2462fd110e2930f74ef5636adb436 (diff) | |
| download | linux-7a0f475513fa573bc8e072021960313da32f0ee3.tar.gz linux-7a0f475513fa573bc8e072021960313da32f0ee3.tar.bz2 linux-7a0f475513fa573bc8e072021960313da32f0ee3.zip | |
[S390] qdio enhanced SIGA (iqdio) support.
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 <kdwacker@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/cio/qdio.h | 3 | ||||
| -rw-r--r-- | drivers/s390/cio/qdio_main.c | 24 |
2 files changed, 22 insertions, 5 deletions
diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h index af867731a5f4..e3ea1d5f2810 100644 --- a/drivers/s390/cio/qdio.h +++ b/drivers/s390/cio/qdio.h @@ -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; }; diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c index 719066ec0c01..a50682d2a0fa 100644 --- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -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; } |