linux-kernel - [PATCH 3/5] RFC genirq: save irq timestamps in void *dev

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Date:	Mon, 21 Mar 2011 12:59:18 +0100
From:	Torben Hohn <torbenh@....de>
To:	linux-kernel@...r.kernel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>, linuxpps@...enneenne.com,
	Torben Hohn <torbenh@....de>
Subject: [PATCH 3/5] RFC genirq: save irq timestamps in void *dev_id

To make the timestamps accessible to the irq handler,
we mandate that IRQF_TIMESTAMP irqs have their dev_id
point to a struct timespec, where the timestamp is stored.

Genirq will fill in the timestamp before calling the irq handler.

Signed-off-by: Torben Hohn <torbenh@....de>
---
 kernel/irq/handle.c |    6 ++++++
 kernel/irq/manage.c |    9 +++++++++
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 3540a71..4edcd03 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -64,6 +64,12 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
 	unsigned int status = 0;
 
 	do {
+		if (action->flags & IRQF_TIMESTAMP) {
+			struct timespec *ts = action->dev_id;
+			struct irq_desc *desc = irq_to_desc(irq);
+			*ts = desc->last_timestamp;
+		}
+
 		trace_irq_handler_entry(irq, action);
 		ret = action->handler(irq, action->dev_id);
 		trace_irq_handler_exit(irq, action, ret);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index adbf6c9..b60350f 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -972,6 +972,8 @@ static struct irqaction *__free_irq(unsigned int irq, void *dev_id)
 	 *   'real' IRQ doesn't run in * parallel with our fake. )
 	 */
 	if (action->flags & IRQF_SHARED) {
+		if (action->flags & IRQF_TIMESTAMP)
+			getrawmonotonic((struct timespec *)dev_id);
 		local_irq_save(flags);
 		action->handler(irq, dev_id);
 		local_irq_restore(flags);
@@ -1068,6 +1070,10 @@ EXPORT_SYMBOL(free_irq);
  *	IRQF_SHARED		Interrupt is shared
  *	IRQF_SAMPLE_RANDOM	The interrupt can be used for entropy
  *	IRQF_TRIGGER_*		Specify active edge(s) or level
+ *	IRQF_TIMESTAMP		Interrupt gets timestamped. (in this
+ *				case dev_id MUST point to a 
+ *				struct timespec which will be filled
+ *				with the timestamp)
  *
  */
 int request_threaded_irq(unsigned int irq, irq_handler_t handler,
@@ -1127,6 +1133,9 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler,
 		 */
 		unsigned long flags;
 
+		if (irqflags & IRQF_TIMESTAMP)
+			getrawmonotonic((struct timespec *)dev_id);
+
 		disable_irq(irq);
 		local_irq_save(flags);
 
-- 
1.7.2.3

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