diff options
Diffstat (limited to 'drivers/infiniband/hw/ehca/ehca_cq.c')
| -rw-r--r-- | drivers/infiniband/hw/ehca/ehca_cq.c | 50 |
1 files changed, 21 insertions, 29 deletions
diff --git a/drivers/infiniband/hw/ehca/ehca_cq.c b/drivers/infiniband/hw/ehca/ehca_cq.c index 67f0670fe3b1..01d4a148bd71 100644 --- a/drivers/infiniband/hw/ehca/ehca_cq.c +++ b/drivers/infiniband/hw/ehca/ehca_cq.c @@ -56,11 +56,11 @@ int ehca_cq_assign_qp(struct ehca_cq *cq, struct ehca_qp *qp) { unsigned int qp_num = qp->real_qp_num; unsigned int key = qp_num & (QP_HASHTAB_LEN-1); - unsigned long spl_flags; + unsigned long flags; - spin_lock_irqsave(&cq->spinlock, spl_flags); + spin_lock_irqsave(&cq->spinlock, flags); hlist_add_head(&qp->list_entries, &cq->qp_hashtab[key]); - spin_unlock_irqrestore(&cq->spinlock, spl_flags); + spin_unlock_irqrestore(&cq->spinlock, flags); ehca_dbg(cq->ib_cq.device, "cq_num=%x real_qp_num=%x", cq->cq_number, qp_num); @@ -74,9 +74,9 @@ int ehca_cq_unassign_qp(struct ehca_cq *cq, unsigned int real_qp_num) unsigned int key = real_qp_num & (QP_HASHTAB_LEN-1); struct hlist_node *iter; struct ehca_qp *qp; - unsigned long spl_flags; + unsigned long flags; - spin_lock_irqsave(&cq->spinlock, spl_flags); + spin_lock_irqsave(&cq->spinlock, flags); hlist_for_each(iter, &cq->qp_hashtab[key]) { qp = hlist_entry(iter, struct ehca_qp, list_entries); if (qp->real_qp_num == real_qp_num) { @@ -88,7 +88,7 @@ int ehca_cq_unassign_qp(struct ehca_cq *cq, unsigned int real_qp_num) break; } } - spin_unlock_irqrestore(&cq->spinlock, spl_flags); + spin_unlock_irqrestore(&cq->spinlock, flags); if (ret) ehca_err(cq->ib_cq.device, "qp not found cq_num=%x real_qp_num=%x", @@ -146,6 +146,7 @@ struct ib_cq *ehca_create_cq(struct ib_device *device, int cqe, int comp_vector, spin_lock_init(&my_cq->spinlock); spin_lock_init(&my_cq->cb_lock); spin_lock_init(&my_cq->task_lock); + atomic_set(&my_cq->nr_events, 0); init_waitqueue_head(&my_cq->wait_completion); my_cq->ownpid = current->tgid; @@ -162,9 +163,9 @@ struct ib_cq *ehca_create_cq(struct ib_device *device, int cqe, int comp_vector, goto create_cq_exit1; } - spin_lock_irqsave(&ehca_cq_idr_lock, flags); + write_lock_irqsave(&ehca_cq_idr_lock, flags); ret = idr_get_new(&ehca_cq_idr, my_cq, &my_cq->token); - spin_unlock_irqrestore(&ehca_cq_idr_lock, flags); + write_unlock_irqrestore(&ehca_cq_idr_lock, flags); } while (ret == -EAGAIN); @@ -293,9 +294,9 @@ create_cq_exit3: "cq_num=%x h_ret=%lx", my_cq, my_cq->cq_number, h_ret); create_cq_exit2: - spin_lock_irqsave(&ehca_cq_idr_lock, flags); + write_lock_irqsave(&ehca_cq_idr_lock, flags); idr_remove(&ehca_cq_idr, my_cq->token); - spin_unlock_irqrestore(&ehca_cq_idr_lock, flags); + write_unlock_irqrestore(&ehca_cq_idr_lock, flags); create_cq_exit1: kmem_cache_free(cq_cache, my_cq); @@ -303,16 +304,6 @@ create_cq_exit1: return cq; } -static int get_cq_nr_events(struct ehca_cq *my_cq) -{ - int ret; - unsigned long flags; - spin_lock_irqsave(&ehca_cq_idr_lock, flags); - ret = my_cq->nr_events; - spin_unlock_irqrestore(&ehca_cq_idr_lock, flags); - return ret; -} - int ehca_destroy_cq(struct ib_cq *cq) { u64 h_ret; @@ -339,17 +330,18 @@ int ehca_destroy_cq(struct ib_cq *cq) } } - spin_lock_irqsave(&ehca_cq_idr_lock, flags); - while (my_cq->nr_events) { - spin_unlock_irqrestore(&ehca_cq_idr_lock, flags); - wait_event(my_cq->wait_completion, !get_cq_nr_events(my_cq)); - spin_lock_irqsave(&ehca_cq_idr_lock, flags); - /* recheck nr_events to assure no cqe has just arrived */ - } - + /* + * remove the CQ from the idr first to make sure + * no more interrupt tasklets will touch this CQ + */ + write_lock_irqsave(&ehca_cq_idr_lock, flags); idr_remove(&ehca_cq_idr, my_cq->token); - spin_unlock_irqrestore(&ehca_cq_idr_lock, flags); + write_unlock_irqrestore(&ehca_cq_idr_lock, flags); + + /* now wait until all pending events have completed */ + wait_event(my_cq->wait_completion, !atomic_read(&my_cq->nr_events)); + /* nobody's using our CQ any longer -- we can destroy it */ h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 0); if (h_ret == H_R_STATE) { /* cq in err: read err data and destroy it forcibly */ |