The underlying buffering implementation of mailbox
is converted from block API to kfifo due to the simplicity
and speed of kfifo.
Signed-off-by: Ohad Ben-Cohen <ohad@xxxxxxxxxx>
Signed-off-by: Hari Kanigeri <h-kanigeri2@xxxxxx>
---
arch/arm/plat-omap/include/plat/mailbox.h | 5 +-
arch/arm/plat-omap/mailbox.c | 108 +++++++++++++----------------
2 files changed, 52 insertions(+), 61 deletions(-)
diff --git a/arch/arm/plat-omap/include/plat/mailbox.h b/arch/arm/plat-omap/include/plat/mailbox.h
index 729166b..014cc58 100644
--- a/arch/arm/plat-omap/include/plat/mailbox.h
+++ b/arch/arm/plat-omap/include/plat/mailbox.h
@@ -7,6 +7,7 @@
#include <linux/workqueue.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
+#include <linux/kfifo.h>
typedef u32 mbox_msg_t;
struct omap_mbox;
@@ -19,6 +20,8 @@ typedef int __bitwise omap_mbox_type_t;
#define OMAP_MBOX_TYPE1 ((__force omap_mbox_type_t) 1)
#define OMAP_MBOX_TYPE2 ((__force omap_mbox_type_t) 2)
+#define MBOX_KFIFO_SIZE (256)
+
struct omap_mbox_ops {
omap_mbox_type_t type;
int (*startup)(struct omap_mbox *mbox);
@@ -42,7 +45,7 @@ struct omap_mbox_ops {
struct omap_mbox_queue {
spinlock_t lock;
- struct request_queue *queue;
+ struct kfifo fifo;
struct work_struct work;
struct tasklet_struct tasklet;
int (*callback)(void *);
diff --git a/arch/arm/plat-omap/mailbox.c b/arch/arm/plat-omap/mailbox.c
index 72b17ad..b1324f3 100644
--- a/arch/arm/plat-omap/mailbox.c
+++ b/arch/arm/plat-omap/mailbox.c
@@ -26,6 +26,7 @@
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/slab.h>
+#include <linux/kfifo.h>
#include <plat/mailbox.h>
@@ -67,7 +68,7 @@ static inline int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
/*
* message sender
*/
-static int __mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
+static int __mbox_poll_for_space(struct omap_mbox *mbox)
{
int ret = 0, i = 1000;
@@ -78,49 +79,54 @@ static int __mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
return -1;
udelay(1);
}
- mbox_fifo_write(mbox, msg);
return ret;
}
-
int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
{
+ struct omap_mbox_queue *mq = mbox->txq;
+ int ret = 0, len;
- struct request *rq;
- struct request_queue *q = mbox->txq->queue;
+ spin_lock(&mq->lock);
- rq = blk_get_request(q, WRITE, GFP_ATOMIC);
- if (unlikely(!rq))
- return -ENOMEM;
+ if (kfifo_avail(&mq->fifo) < sizeof(msg)) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
+ if (unlikely(len != sizeof(msg))) {
+ pr_err("%s: kfifo_in anomaly\n", __func__);
+ ret = -ENOMEM;
+ }
- blk_insert_request(q, rq, 0, (void *) msg);
tasklet_schedule(&mbox->txq->tasklet);
- return 0;
+out:
+ spin_unlock(&mq->lock);
+ return ret;
}
EXPORT_SYMBOL(omap_mbox_msg_send);
static void mbox_tx_tasklet(unsigned long tx_data)
{
- int ret;
- struct request *rq;
struct omap_mbox *mbox = (struct omap_mbox *)tx_data;
- struct request_queue *q = mbox->txq->queue;
-
- while (1) {
-
- rq = blk_fetch_request(q);
-
- if (!rq)
- break;
+ struct omap_mbox_queue *mq = mbox->txq;
+ mbox_msg_t msg;
+ int ret;
- ret = __mbox_msg_send(mbox, (mbox_msg_t)rq->special);
- if (ret) {
+ while (kfifo_len(&mq->fifo)) {
+ if (__mbox_poll_for_space(mbox)) {
omap_mbox_enable_irq(mbox, IRQ_TX);
- blk_requeue_request(q, rq);
- return;
+ break;
}
- blk_end_request_all(rq, 0);
+
+ ret = kfifo_out(&mq->fifo, (unsigned char *)&msg,
+ sizeof(msg));
+ if (unlikely(ret != sizeof(msg)))
+ pr_err("%s: kfifo_out anomaly\n", __func__);
+
+ mbox_fifo_write(mbox, msg);
}
}
@@ -131,36 +137,22 @@ static void mbox_rx_work(struct work_struct *work)
{
struct omap_mbox_queue *mq =
container_of(work, struct omap_mbox_queue, work);
- struct omap_mbox *mbox = mq->queue->queuedata;
- struct request_queue *q = mbox->rxq->queue;
- struct request *rq;
mbox_msg_t msg;
- unsigned long flags;
+ int len;
- while (1) {
- spin_lock_irqsave(q->queue_lock, flags);
- rq = blk_fetch_request(q);
- spin_unlock_irqrestore(q->queue_lock, flags);
- if (!rq)
- break;
+ while (kfifo_len(&mq->fifo) >= sizeof(msg)) {
+ len = kfifo_out(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
+ if (unlikely(len != sizeof(msg)))
+ pr_err("%s: kfifo_out anomaly detected\n", __func__);
- msg = (mbox_msg_t)rq->special;
- blk_end_request_all(rq, 0);
- mbox->rxq->callback((void *)msg);
+ if (mq->callback)
+ mq->callback((void *)msg);
}
}
/*
* Mailbox interrupt handler
*/
-static void mbox_txq_fn(struct request_queue *q)
-{
-}
-
-static void mbox_rxq_fn(struct request_queue *q)
-{
-}
-
static void __mbox_tx_interrupt(struct omap_mbox *mbox)
{
omap_mbox_disable_irq(mbox, IRQ_TX);
@@ -170,19 +162,20 @@ static void __mbox_tx_interrupt(struct omap_mbox *mbox)
static void __mbox_rx_interrupt(struct omap_mbox *mbox)
{
- struct request *rq;
+ struct omap_mbox_queue *mq = mbox->rxq;
mbox_msg_t msg;
- struct request_queue *q = mbox->rxq->queue;
+ int len;
while (!mbox_fifo_empty(mbox)) {
- rq = blk_get_request(q, WRITE, GFP_ATOMIC);
- if (unlikely(!rq))
+ if (unlikely(kfifo_avail(&mq->fifo) < sizeof(msg)))
goto nomem;
msg = mbox_fifo_read(mbox);
- blk_insert_request(q, rq, 0, (void *)msg);
+ len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
+ if (unlikely(len != sizeof(msg)))
+ pr_err("%s: kfifo_in anomaly detected\n", __func__);
if (mbox->ops->type == OMAP_MBOX_TYPE1)
break;
}
@@ -207,11 +200,9 @@ static irqreturn_t mbox_interrupt(int irq, void *p)
}
static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
- request_fn_proc *proc,
void (*work) (struct work_struct *),
void (*tasklet)(unsigned long))
{
- struct request_queue *q;
struct omap_mbox_queue *mq;
mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL);
@@ -220,11 +211,8 @@ static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
spin_lock_init(&mq->lock);
- q = blk_init_queue(proc, &mq->lock);
- if (!q)
+ if (kfifo_alloc(&mq->fifo, MBOX_KFIFO_SIZE, GFP_KERNEL))
goto error;
- q->queuedata = mbox;
- mq->queue = q;
if (work)
INIT_WORK(&mq->work, work);
@@ -239,7 +227,7 @@ error:
static void mbox_queue_free(struct omap_mbox_queue *q)
{
- blk_cleanup_queue(q->queue);
+ kfifo_free(&q->fifo);
kfree(q);
}
@@ -269,14 +257,14 @@ static int omap_mbox_startup(struct omap_mbox *mbox)
goto fail_request_irq;
}
- mq = mbox_queue_alloc(mbox, mbox_txq_fn, NULL, mbox_tx_tasklet);
+ mq = mbox_queue_alloc(mbox, NULL, mbox_tx_tasklet);
if (!mq) {
ret = -ENOMEM;
goto fail_alloc_txq;
}
mbox->txq = mq;
- mq = mbox_queue_alloc(mbox, mbox_rxq_fn, mbox_rx_work, NULL);
+ mq = mbox_queue_alloc(mbox, mbox_rx_work, NULL);
if (!mq) {
ret = -ENOMEM;
goto fail_alloc_rxq;
--
1.6.3.3
--
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