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[PATCH] spi/pl022: Add high priority message pump support
From: Chris Blair chris.bl...@stericsson.com
This switches the PL022 worker to a kthread in order to get
hold of a mechanism to control the message pump priority. On
low-latency systems elevating the message kthread to realtime
priority give a real sleek response curve. This has been
confirmed by measurements. Realtime priority elevation for
a certain PL022 port can be requested from platform data.
Signed-off-by: Chris Blair chris.bl...@stericsson.com
Signed-off-by: Linus Walleij linus.wall...@linaro.org
---
drivers/spi/spi-pl022.c| 77 +--
include/linux/amba/pl022.h |3 ++
2 files changed, 55 insertions(+), 25 deletions(-)
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 2f9cb43..81847c9 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -29,7 +29,7 @@
#include linux/errno.h
#include linux/interrupt.h
#include linux/spi/spi.h
-#include linux/workqueue.h
+#include linux/kthread.h
#include linux/delay.h
#include linux/clk.h
#include linux/err.h
@@ -41,6 +41,7 @@
#include linux/dma-mapping.h
#include linux/scatterlist.h
#include linux/pm_runtime.h
+#include linux/sched.h
/*
* This macro is used to define some register default values.
@@ -330,12 +331,13 @@ struct vendor_data {
* @clk: outgoing clock SPICLK for the SPI bus
* @master: SPI framework hookup
* @master_info: controller-specific data from machine setup
- * @workqueue: a workqueue on which any spi_message request is queued
- * @pump_messages: work struct for scheduling work to the workqueue
+ * @kworker: thread struct for message pump
+ * @kworker_task: pointer to task for message pump kworker thread
+ * @pump_messages: work struct for scheduling work to the message pump
* @queue_lock: spinlock to syncronise access to message queue
* @queue: message queue
- * @busy: workqueue is busy
- * @running: workqueue is running
+ * @busy: message pump is busy
+ * @running: message pump is running
* @pump_transfers: Tasklet used in Interrupt Transfer mode
* @cur_msg: Pointer to current spi_message being processed
* @cur_transfer: Pointer to current spi_transfer
@@ -365,9 +367,10 @@ struct pl022 {
struct clk *clk;
struct spi_master *master;
struct pl022_ssp_controller *master_info;
- /* Driver message queue */
- struct workqueue_struct *workqueue;
- struct work_struct pump_messages;
+ /* Driver message pump */
+ struct kthread_worker kworker;
+ struct task_struct *kworker_task;
+ struct kthread_work pump_messages;
spinlock_t queue_lock;
struct list_headqueue;
boolbusy;
@@ -504,7 +507,7 @@ static void giveback(struct pl022 *pl022)
pl022-cur_msg = NULL;
pl022-cur_transfer = NULL;
pl022-cur_chip = NULL;
- queue_work(pl022-workqueue, pl022-pump_messages);
+ queue_kthread_work(pl022-kworker, pl022-pump_messages);
spin_unlock_irqrestore(pl022-queue_lock, flags);
msg-state = NULL;
@@ -1494,8 +1497,8 @@ out:
}
/**
- * pump_messages - Workqueue function which processes spi message queue
- * @data: pointer to private data of SSP driver
+ * pump_messages - kthread work function which processes spi message queue
+ * @work: pointer to kthread work struct contained in the pl022 private struct
*
* This function checks if there is any spi message in the queue that
* needs processing and delegate control to appropriate function
@@ -1503,7 +1506,7 @@ out:
* based on the kind of the transfer
*
*/
-static void pump_messages(struct work_struct *work)
+static void pump_messages(struct kthread_work *work)
{
struct pl022 *pl022 =
container_of(work, struct pl022, pump_messages);
@@ -1556,7 +1559,7 @@ static void pump_messages(struct work_struct *work)
if (!was_busy)
/*
* We enable the core voltage and clocks here, then the clocks
-* and core will be disabled when this workqueue is run again
+* and core will be disabled when this thread is run again
* and there is no more work to be done.
*/
pm_runtime_get_sync(pl022-adev-dev);
@@ -1572,6 +1575,8 @@ static void pump_messages(struct work_struct *work)
static int __init init_queue(struct pl022 *pl022)
{
+ struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 };
+
INIT_LIST_HEAD(pl022-queue);
spin_lock_init(pl022-queue_lock);
@@ -1581,11 +1586,29 @@ static int __init init_queue(struct pl022 *pl022)
tasklet_init(pl022-pump_transfers, pump_transfers,
(unsigned long)pl022);
- INIT_WORK(pl022-pump_messages, pump_messages);
- pl022-workqueue = create_singlethread_workqueue(
+
Re: [PATCH] spi/pl022: Add high priority message pump support
On 1/25/2012 2:44 AM, Linus WALLEIJ wrote:
From: Chris Blair chris.bl...@stericsson.com
This switches the PL022 worker to a kthread in order to get
hold of a mechanism to control the message pump priority. On
low-latency systems elevating the message kthread to realtime
priority give a real sleek response curve. This has been
confirmed by measurements. Realtime priority elevation for
a certain PL022 port can be requested from platform data.
Signed-off-by: Chris Blair chris.bl...@stericsson.com
Signed-off-by: Linus Walleij linus.wall...@linaro.org
---
drivers/spi/spi-pl022.c| 77 +--
include/linux/amba/pl022.h |3 ++
2 files changed, 55 insertions(+), 25 deletions(-)
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 2f9cb43..81847c9 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -29,7 +29,7 @@
#include linux/errno.h
#include linux/interrupt.h
#include linux/spi/spi.h
-#include linux/workqueue.h
+#include linux/kthread.h
#include linux/delay.h
#include linux/clk.h
#include linux/err.h
@@ -41,6 +41,7 @@
#include linux/dma-mapping.h
#include linux/scatterlist.h
#include linux/pm_runtime.h
+#include linux/sched.h
/*
* This macro is used to define some register default values.
@@ -330,12 +331,13 @@ struct vendor_data {
* @clk: outgoing clock SPICLK for the SPI bus
* @master: SPI framework hookup
* @master_info: controller-specific data from machine setup
- * @workqueue: a workqueue on which any spi_message request is queued
- * @pump_messages: work struct for scheduling work to the workqueue
+ * @kworker: thread struct for message pump
+ * @kworker_task: pointer to task for message pump kworker thread
+ * @pump_messages: work struct for scheduling work to the message pump
* @queue_lock: spinlock to syncronise access to message queue
* @queue: message queue
- * @busy: workqueue is busy
- * @running: workqueue is running
+ * @busy: message pump is busy
+ * @running: message pump is running
* @pump_transfers: Tasklet used in Interrupt Transfer mode
* @cur_msg: Pointer to current spi_message being processed
* @cur_transfer: Pointer to current spi_transfer
@@ -365,9 +367,10 @@ struct pl022 {
struct clk *clk;
struct spi_master *master;
struct pl022_ssp_controller *master_info;
- /* Driver message queue */
- struct workqueue_struct *workqueue;
- struct work_struct pump_messages;
+ /* Driver message pump */
+ struct kthread_worker kworker;
+ struct task_struct *kworker_task;
+ struct kthread_work pump_messages;
spinlock_t queue_lock;
struct list_headqueue;
boolbusy;
@@ -504,7 +507,7 @@ static void giveback(struct pl022 *pl022)
pl022-cur_msg = NULL;
pl022-cur_transfer = NULL;
pl022-cur_chip = NULL;
- queue_work(pl022-workqueue, pl022-pump_messages);
+ queue_kthread_work(pl022-kworker, pl022-pump_messages);
spin_unlock_irqrestore(pl022-queue_lock, flags);
msg-state = NULL;
@@ -1494,8 +1497,8 @@ out:
}
/**
- * pump_messages - Workqueue function which processes spi message queue
- * @data: pointer to private data of SSP driver
+ * pump_messages - kthread work function which processes spi message queue
+ * @work: pointer to kthread work struct contained in the pl022 private
struct
*
* This function checks if there is any spi message in the queue that
* needs processing and delegate control to appropriate function
@@ -1503,7 +1506,7 @@ out:
* based on the kind of the transfer
*
*/
-static void pump_messages(struct work_struct *work)
+static void pump_messages(struct kthread_work *work)
{
struct pl022 *pl022 =
container_of(work, struct pl022, pump_messages);
@@ -1556,7 +1559,7 @@ static void pump_messages(struct work_struct *work)
if (!was_busy)
/*
* We enable the core voltage and clocks here, then the clocks
- * and core will be disabled when this workqueue is run again
+ * and core will be disabled when this thread is run again
* and there is no more work to be done.
*/
pm_runtime_get_sync(pl022-adev-dev);
@@ -1572,6 +1575,8 @@ static void pump_messages(struct work_struct *work)
static int __init init_queue(struct pl022 *pl022)
{
+ struct sched_param param = { .sched_priority = MAX_RT_PRIO - 1 };
+
INIT_LIST_HEAD(pl022-queue);
spin_lock_init(pl022-queue_lock);
@@ -1581,11 +1586,29 @@ static int __init init_queue(struct pl022 *pl022)
tasklet_init(pl022-pump_transfers, pump_transfers,
(unsigned long)pl022);
-
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