From e52e6080ca10e0a8ce2a35c86965945cdfa8ed7e Mon Sep 17 00:00:00 2001
From: Tom Tucker <tom@opengridcomputing.com>
Date: Tue, 3 Oct 2006 09:46:41 -0500
Subject: RDMA/amso1100: Add spinlocks to serialize ib_post_send/ib_post_recv
The AMSO driver was not thread-safe in the post WR code and had
code that would sleep if the WR post FIFO was full. Since these
functions can be called on interrupt level I changed the sleep to a
udelay.
Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
---
drivers/infiniband/hw/amso1100/c2_qp.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
(limited to 'drivers')
diff --git a/drivers/infiniband/hw/amso1100/c2_qp.c b/drivers/infiniband/hw/amso1100/c2_qp.c
index 12261132b07..5bcf697aa33 100644
--- a/drivers/infiniband/hw/amso1100/c2_qp.c
+++ b/drivers/infiniband/hw/amso1100/c2_qp.c
@@ -35,6 +35,8 @@
*
*/
+#include <linux/delay.h>
+
#include "c2.h"
#include "c2_vq.h"
#include "c2_status.h"
@@ -705,10 +707,8 @@ static inline void c2_activity(struct c2_dev *c2dev, u32 mq_index, u16 shared)
* cannot get on the bus and the card and system hang in a
* deadlock -- thus the need for this code. [TOT]
*/
- while (readl(c2dev->regs + PCI_BAR0_ADAPTER_HINT) & 0x80000000) {
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule_timeout(0);
- }
+ while (readl(c2dev->regs + PCI_BAR0_ADAPTER_HINT) & 0x80000000)
+ udelay(10);
__raw_writel(C2_HINT_MAKE(mq_index, shared),
c2dev->regs + PCI_BAR0_ADAPTER_HINT);
@@ -766,6 +766,7 @@ int c2_post_send(struct ib_qp *ibqp, struct ib_send_wr *ib_wr,
struct c2_dev *c2dev = to_c2dev(ibqp->device);
struct c2_qp *qp = to_c2qp(ibqp);
union c2wr wr;
+ unsigned long lock_flags;
int err = 0;
u32 flags;
@@ -881,8 +882,10 @@ int c2_post_send(struct ib_qp *ibqp, struct ib_send_wr *ib_wr,
/*
* Post the puppy!
*/
+ spin_lock_irqsave(&qp->lock, lock_flags);
err = qp_wr_post(&qp->sq_mq, &wr, qp, msg_size);
if (err) {
+ spin_unlock_irqrestore(&qp->lock, lock_flags);
break;
}
@@ -890,6 +893,7 @@ int c2_post_send(struct ib_qp *ibqp, struct ib_send_wr *ib_wr,
* Enqueue mq index to activity FIFO.
*/
c2_activity(c2dev, qp->sq_mq.index, qp->sq_mq.hint_count);
+ spin_unlock_irqrestore(&qp->lock, lock_flags);
ib_wr = ib_wr->next;
}
@@ -905,6 +909,7 @@ int c2_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *ib_wr,
struct c2_dev *c2dev = to_c2dev(ibqp->device);
struct c2_qp *qp = to_c2qp(ibqp);
union c2wr wr;
+ unsigned long lock_flags;
int err = 0;
if (qp->state > IB_QPS_RTS)
@@ -945,8 +950,10 @@ int c2_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *ib_wr,
break;
}
+ spin_lock_irqsave(&qp->lock, lock_flags);
err = qp_wr_post(&qp->rq_mq, &wr, qp, qp->rq_mq.msg_size);
if (err) {
+ spin_unlock_irqrestore(&qp->lock, lock_flags);
break;
}
@@ -954,6 +961,7 @@ int c2_post_receive(struct ib_qp *ibqp, struct ib_recv_wr *ib_wr,
* Enqueue mq index to activity FIFO
*/
c2_activity(c2dev, qp->rq_mq.index, qp->rq_mq.hint_count);
+ spin_unlock_irqrestore(&qp->lock, lock_flags);
ib_wr = ib_wr->next;
}
--
cgit v1.2.3-18-g5258