IB/ehca: Change idr spinlocks into rwlocks
This eliminates lock contention among IRQs as well as the need to
disable IRQs around idr_find, because there are no IRQ writers.
Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/ehca/ehca_classes.h b/drivers/infiniband/hw/ehca/ehca_classes.h
index 8580f2a..f1e0db2 100644
--- a/drivers/infiniband/hw/ehca/ehca_classes.h
+++ b/drivers/infiniband/hw/ehca/ehca_classes.h
@@ -293,8 +293,8 @@
int ehca_init_mrmw_cache(void);
void ehca_cleanup_mrmw_cache(void);
-extern spinlock_t ehca_qp_idr_lock;
-extern spinlock_t ehca_cq_idr_lock;
+extern rwlock_t ehca_qp_idr_lock;
+extern rwlock_t ehca_cq_idr_lock;
extern struct idr ehca_qp_idr;
extern struct idr ehca_cq_idr;
diff --git a/drivers/infiniband/hw/ehca/ehca_cq.c b/drivers/infiniband/hw/ehca/ehca_cq.c
index 3729997..01d4a14 100644
--- a/drivers/infiniband/hw/ehca/ehca_cq.c
+++ b/drivers/infiniband/hw/ehca/ehca_cq.c
@@ -163,9 +163,9 @@
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);
@@ -294,9 +294,9 @@
"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);
@@ -334,9 +334,9 @@
* remove the CQ from the idr first to make sure
* no more interrupt tasklets will touch this CQ
*/
- 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);
/* now wait until all pending events have completed */
wait_event(my_cq->wait_completion, !atomic_read(&my_cq->nr_events));
diff --git a/drivers/infiniband/hw/ehca/ehca_irq.c b/drivers/infiniband/hw/ehca/ehca_irq.c
index 3e790a3..02b73c8 100644
--- a/drivers/infiniband/hw/ehca/ehca_irq.c
+++ b/drivers/infiniband/hw/ehca/ehca_irq.c
@@ -180,12 +180,11 @@
{
struct ib_event event;
struct ehca_qp *qp;
- unsigned long flags;
u32 token = EHCA_BMASK_GET(EQE_QP_TOKEN, eqe);
- spin_lock_irqsave(&ehca_qp_idr_lock, flags);
+ read_lock(&ehca_qp_idr_lock);
qp = idr_find(&ehca_qp_idr, token);
- spin_unlock_irqrestore(&ehca_qp_idr_lock, flags);
+ read_unlock(&ehca_qp_idr_lock);
if (!qp)
@@ -209,14 +208,13 @@
u64 eqe)
{
struct ehca_cq *cq;
- unsigned long flags;
u32 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe);
- spin_lock_irqsave(&ehca_cq_idr_lock, flags);
+ read_lock(&ehca_cq_idr_lock);
cq = idr_find(&ehca_cq_idr, token);
if (cq)
atomic_inc(&cq->nr_events);
- spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
+ read_unlock(&ehca_cq_idr_lock);
if (!cq)
return;
@@ -411,7 +409,6 @@
{
u64 eqe_value;
u32 token;
- unsigned long flags;
struct ehca_cq *cq;
eqe_value = eqe->entry;
@@ -419,11 +416,11 @@
if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) {
ehca_dbg(&shca->ib_device, "Got completion event");
token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value);
- spin_lock_irqsave(&ehca_cq_idr_lock, flags);
+ read_lock(&ehca_cq_idr_lock);
cq = idr_find(&ehca_cq_idr, token);
if (cq)
atomic_inc(&cq->nr_events);
- spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
+ read_unlock(&ehca_cq_idr_lock);
if (cq == NULL) {
ehca_err(&shca->ib_device,
"Invalid eqe for non-existing cq token=%x",
@@ -480,11 +477,11 @@
eqe_value = eqe_cache[eqe_cnt].eqe->entry;
if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) {
token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value);
- spin_lock(&ehca_cq_idr_lock);
+ read_lock(&ehca_cq_idr_lock);
eqe_cache[eqe_cnt].cq = idr_find(&ehca_cq_idr, token);
if (eqe_cache[eqe_cnt].cq)
atomic_inc(&eqe_cache[eqe_cnt].cq->nr_events);
- spin_unlock(&ehca_cq_idr_lock);
+ read_unlock(&ehca_cq_idr_lock);
if (!eqe_cache[eqe_cnt].cq) {
ehca_err(&shca->ib_device,
"Invalid eqe for non-existing cq "
diff --git a/drivers/infiniband/hw/ehca/ehca_main.c b/drivers/infiniband/hw/ehca/ehca_main.c
index 32396b2..28ba2dd 100644
--- a/drivers/infiniband/hw/ehca/ehca_main.c
+++ b/drivers/infiniband/hw/ehca/ehca_main.c
@@ -96,8 +96,8 @@
MODULE_PARM_DESC(scaling_code,
"set scaling code (0: disabled/default, 1: enabled)");
-DEFINE_SPINLOCK(ehca_qp_idr_lock);
-DEFINE_SPINLOCK(ehca_cq_idr_lock);
+DEFINE_RWLOCK(ehca_qp_idr_lock);
+DEFINE_RWLOCK(ehca_cq_idr_lock);
DEFINE_IDR(ehca_qp_idr);
DEFINE_IDR(ehca_cq_idr);
diff --git a/drivers/infiniband/hw/ehca/ehca_qp.c b/drivers/infiniband/hw/ehca/ehca_qp.c
index 31d2152..7467125 100644
--- a/drivers/infiniband/hw/ehca/ehca_qp.c
+++ b/drivers/infiniband/hw/ehca/ehca_qp.c
@@ -512,9 +512,9 @@
goto create_qp_exit0;
}
- spin_lock_irqsave(&ehca_qp_idr_lock, flags);
+ write_lock_irqsave(&ehca_qp_idr_lock, flags);
ret = idr_get_new(&ehca_qp_idr, my_qp, &my_qp->token);
- spin_unlock_irqrestore(&ehca_qp_idr_lock, flags);
+ write_unlock_irqrestore(&ehca_qp_idr_lock, flags);
} while (ret == -EAGAIN);
@@ -733,9 +733,9 @@
hipz_h_destroy_qp(shca->ipz_hca_handle, my_qp);
create_qp_exit1:
- spin_lock_irqsave(&ehca_qp_idr_lock, flags);
+ write_lock_irqsave(&ehca_qp_idr_lock, flags);
idr_remove(&ehca_qp_idr, my_qp->token);
- spin_unlock_irqrestore(&ehca_qp_idr_lock, flags);
+ write_unlock_irqrestore(&ehca_qp_idr_lock, flags);
create_qp_exit0:
kmem_cache_free(qp_cache, my_qp);
@@ -1706,9 +1706,9 @@
}
}
- spin_lock_irqsave(&ehca_qp_idr_lock, flags);
+ write_lock_irqsave(&ehca_qp_idr_lock, flags);
idr_remove(&ehca_qp_idr, my_qp->token);
- spin_unlock_irqrestore(&ehca_qp_idr_lock, flags);
+ write_unlock_irqrestore(&ehca_qp_idr_lock, flags);
h_ret = hipz_h_destroy_qp(shca->ipz_hca_handle, my_qp);
if (h_ret != H_SUCCESS) {
diff --git a/drivers/infiniband/hw/ehca/ehca_uverbs.c b/drivers/infiniband/hw/ehca/ehca_uverbs.c
index d8fe37d..3031b3b 100644
--- a/drivers/infiniband/hw/ehca/ehca_uverbs.c
+++ b/drivers/infiniband/hw/ehca/ehca_uverbs.c
@@ -253,7 +253,6 @@
u32 rsrc_type = (fileoffset >> 24) & 0xF; /* sq,rq,cmnd_window */
u32 cur_pid = current->tgid;
u32 ret;
- unsigned long flags;
struct ehca_cq *cq;
struct ehca_qp *qp;
struct ehca_pd *pd;
@@ -261,9 +260,9 @@
switch (q_type) {
case 1: /* CQ */
- spin_lock_irqsave(&ehca_cq_idr_lock, flags);
+ read_lock(&ehca_cq_idr_lock);
cq = idr_find(&ehca_cq_idr, idr_handle);
- spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
+ read_unlock(&ehca_cq_idr_lock);
/* make sure this mmap really belongs to the authorized user */
if (!cq)
@@ -289,9 +288,9 @@
break;
case 2: /* QP */
- spin_lock_irqsave(&ehca_qp_idr_lock, flags);
+ read_lock(&ehca_qp_idr_lock);
qp = idr_find(&ehca_qp_idr, idr_handle);
- spin_unlock_irqrestore(&ehca_qp_idr_lock, flags);
+ read_unlock(&ehca_qp_idr_lock);
/* make sure this mmap really belongs to the authorized user */
if (!qp)