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[S390] qdio: cleanup SIGA sync

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Simplify the SIGA sync code and add unlikely annotations. In polling mode
SBALs may be accessed without interrupt, so call SIGA sync before every scan.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Jan Glauber
2011-01-05 12:47:54 +01:00
committed by Martin Schwidefsky
parent 110da31709
commit 90adac58d1
3 changed files with 44 additions and 55 deletions
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64
drivers/s390/cio/qdio_main.c
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@@ -286,9 +286,6 @@ static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output,
unsigned int fc = QDIO_SIGA_SYNC;
int cc;
if (!need_siga_sync(q))
return 0;
DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr);
qperf_inc(q, siga_sync);
@@ -311,16 +308,6 @@ static inline int qdio_siga_sync_q(struct qdio_q *q)
return qdio_siga_sync(q, q->mask, 0);
}
static inline int qdio_siga_sync_out(struct qdio_q *q)
{
return qdio_siga_sync(q, ~0U, 0);
}
static inline int qdio_siga_sync_all(struct qdio_q *q)
{
return qdio_siga_sync(q, ~0U, ~0U);
}
static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit)
{
unsigned long schid = *((u32 *) &q->irq_ptr->schid);
@@ -369,21 +356,23 @@ static inline int qdio_siga_input(struct qdio_q *q)
return cc;
}
static inline void qdio_sync_after_thinint(struct qdio_q *q)
#define qdio_siga_sync_out(q) qdio_siga_sync(q, ~0U, 0)
#define qdio_siga_sync_all(q) qdio_siga_sync(q, ~0U, ~0U)
static inline void qdio_sync_queues(struct qdio_q *q)
{
if (pci_out_supported(q)) {
if (need_siga_sync_thinint(q))
qdio_siga_sync_all(q);
else if (need_siga_sync_out_thinint(q))
qdio_siga_sync_out(q);
} else
/* PCI capable outbound queues will also be scanned so sync them too */
if (pci_out_supported(q))
qdio_siga_sync_all(q);
else
qdio_siga_sync_q(q);
}
int debug_get_buf_state(struct qdio_q *q, unsigned int bufnr,
unsigned char *state)
{
qdio_siga_sync_q(q);
if (need_siga_sync(q))
qdio_siga_sync_q(q);
return get_buf_states(q, bufnr, state, 1, 0);
}
@@ -560,7 +549,8 @@ static inline int qdio_inbound_q_done(struct qdio_q *q)
if (!atomic_read(&q->nr_buf_used))
return 1;
qdio_siga_sync_q(q);
if (need_siga_sync(q))
qdio_siga_sync_q(q);
get_buf_state(q, q->first_to_check, &state, 0);
if (state == SLSB_P_INPUT_PRIMED || state == SLSB_P_INPUT_ERROR)
@@ -655,9 +645,12 @@ static int get_outbound_buffer_frontier(struct qdio_q *q)
int count, stop;
unsigned char state;
if (((queue_type(q) != QDIO_IQDIO_QFMT) && !pci_out_supported(q)) ||
(queue_type(q) == QDIO_IQDIO_QFMT && multicast_outbound(q)))
qdio_siga_sync_q(q);
if (need_siga_sync(q))
if (((queue_type(q) != QDIO_IQDIO_QFMT) &&
!pci_out_supported(q)) ||
(queue_type(q) == QDIO_IQDIO_QFMT &&
multicast_outbound(q)))
qdio_siga_sync_q(q);
/*
* Don't check 128 buffers, as otherwise qdio_inbound_q_moved
@@ -829,7 +822,8 @@ static inline void qdio_check_outbound_after_thinint(struct qdio_q *q)
static void __tiqdio_inbound_processing(struct qdio_q *q)
{
qperf_inc(q, tasklet_inbound);
qdio_sync_after_thinint(q);
if (need_siga_sync(q) && need_siga_sync_after_ai(q))
qdio_sync_queues(q);
/*
* The interrupt could be caused by a PCI request. Check the
@@ -909,16 +903,14 @@ static void qdio_int_handler_pci(struct qdio_irq *irq_ptr)
tasklet_schedule(&q->tasklet);
}
if (!(irq_ptr->qib.ac & QIB_AC_OUTBOUND_PCI_SUPPORTED))
if (!pci_out_supported(q))
return;
for_each_output_queue(irq_ptr, q, i) {
if (qdio_outbound_q_done(q))
continue;
if (!siga_syncs_out_pci(q))
if (need_siga_sync(q) && need_siga_sync_out_after_pci(q))
qdio_siga_sync_q(q);
tasklet_schedule(&q->tasklet);
}
}
@@ -1470,7 +1462,7 @@ static int handle_outbound(struct qdio_q *q, unsigned int callflags,
WARN_ON_ONCE(count > 1 && !multicast_outbound(q));
rc = qdio_kick_outbound_q(q);
} else if (unlikely(need_siga_sync(q))) {
} else if (need_siga_sync(q)) {
rc = qdio_siga_sync_q(q);
} else {
/* try to fast requeue buffers */
@@ -1597,12 +1589,14 @@ int qdio_get_next_buffers(struct ccw_device *cdev, int nr, int *bufnr,
q = irq_ptr->input_qs[nr];
WARN_ON(queue_irqs_enabled(q));
qdio_sync_after_thinint(q);
/*
* The interrupt could be caused by a PCI request. Check the
* PCI capable outbound queues.
* Cannot rely on automatic sync after interrupt since queues may
* also be examined without interrupt.
*/
if (need_siga_sync(q))
qdio_sync_queues(q);
/* check the PCI capable outbound queues. */
qdio_check_outbound_after_thinint(q);
if (!qdio_inbound_q_moved(q))