From 9a2c160a8cbd5b3253672b3bac462c64d0d2eef7 Mon Sep 17 00:00:00 2001 From: Jan Glauber Date: Mon, 22 Jun 2009 12:08:11 +0200 Subject: [PATCH] [S390] qdio: fix check for running under z/VM The check whether qdio runs under z/VM was incorrect since SIGA-Sync is not set if the device runs with QIOASSIST. Use MACHINE_IS_VM instead to prevent polling under z/VM. Merge qdio_inbound_q_done and tiqdio_is_inbound_q_done. Signed-off-by: Jan Glauber Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/qdio_main.c | 68 ++++++++++++------------------------ 1 file changed, 23 insertions(+), 45 deletions(-) diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c index 377d881385cf..127e78eef651 100644 --- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -499,7 +499,7 @@ check_next: /* * No siga-sync needed for non-qebsm here, as the inbound queue * will be synced on the next siga-r, resp. - * tiqdio_is_inbound_q_done will do the siga-sync. + * qdio_inbound_q_done will do the siga-sync. */ q->first_to_check = add_buf(q->first_to_check, count); atomic_sub(count, &q->nr_buf_used); @@ -530,53 +530,14 @@ static int qdio_inbound_q_moved(struct qdio_q *q) if ((bufnr != q->last_move) || q->qdio_error) { q->last_move = bufnr; - if (!need_siga_sync(q) && !pci_out_supported(q)) + if (!is_thinint_irq(q->irq_ptr) && !MACHINE_IS_VM) q->u.in.timestamp = get_usecs(); - - DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in moved"); return 1; } else return 0; } -static int qdio_inbound_q_done(struct qdio_q *q) -{ - unsigned char state = 0; - - if (!atomic_read(&q->nr_buf_used)) - return 1; - - /* - * We need that one for synchronization with the adapter, as it - * does a kind of PCI avoidance. - */ - qdio_siga_sync_q(q); - - get_buf_state(q, q->first_to_check, &state, 0); - if (state == SLSB_P_INPUT_PRIMED) - /* we got something to do */ - return 0; - - /* on VM, we don't poll, so the q is always done here */ - if (need_siga_sync(q) || pci_out_supported(q)) - return 1; - - /* - * At this point we know, that inbound first_to_check - * has (probably) not moved (see qdio_inbound_processing). - */ - if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { - DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%3d", - q->first_to_check); - return 1; - } else { - DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in notd:%3d", - q->first_to_check); - return 0; - } -} - -static inline int tiqdio_inbound_q_done(struct qdio_q *q) +static inline int qdio_inbound_q_done(struct qdio_q *q) { unsigned char state = 0; @@ -589,7 +550,24 @@ static inline int tiqdio_inbound_q_done(struct qdio_q *q) if (state == SLSB_P_INPUT_PRIMED) /* more work coming */ return 0; - return 1; + + if (is_thinint_irq(q->irq_ptr)) + return 1; + + /* don't poll under z/VM */ + if (MACHINE_IS_VM) + return 1; + + /* + * At this point we know, that inbound first_to_check + * has (probably) not moved (see qdio_inbound_processing). + */ + if (get_usecs() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { + DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%3d", + q->first_to_check); + return 1; + } else + return 0; } static void qdio_kick_handler(struct qdio_q *q) @@ -847,7 +825,7 @@ static void __tiqdio_inbound_processing(struct qdio_q *q) qdio_kick_handler(q); - if (!tiqdio_inbound_q_done(q)) { + if (!qdio_inbound_q_done(q)) { qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop); if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) tasklet_schedule(&q->tasklet); @@ -858,7 +836,7 @@ static void __tiqdio_inbound_processing(struct qdio_q *q) * We need to check again to not lose initiative after * resetting the ACK state. */ - if (!tiqdio_inbound_q_done(q)) { + if (!qdio_inbound_q_done(q)) { qdio_perf_stat_inc(&perf_stats.thinint_inbound_loop2); if (likely(q->irq_ptr->state != QDIO_IRQ_STATE_STOPPED)) tasklet_schedule(&q->tasklet);