[PATCH 0/2] Make IPI and localtimer handlers callable from C code

[PATCH 0/2] Make IPI and localtimer handlers callable from C code

[Shawn Guo]

[Sorry for send you twice, Russell, Marc.  I forgot cc LAKML last time.]

With imx sub-architecture is moving to MULTI_IRQ_HANDLER, imx6q has to
get a local gic_handler_irq() implementation calling IPI and localtimer
handlers from C code, before Marc's global gic_handler_irq() series gets
merged.

This patch series changes the original __exception_irq_entry to a
wrapper for actual IPI and localtimer handlers which are callable from
C code now.

Marc Zyngier (1):
     ARM: smp: Add an IPI handler callable from C code

Shawn Guo (1):
     ARM: smp: Add a localtimer handler callable from C code

 arch/arm/include/asm/localtimer.h |    4 ++++
 arch/arm/include/asm/smp.h        |    5 +++++
 arch/arm/kernel/smp.c             |   10 ++++++++++
 3 files changed, 19 insertions(+), 0 deletions(-)

[PATCH 1/2] ARM: smp: Add an IPI handler callable from C code

[Shawn Guo]

From: Marc Zyngier <marc.zyngier@arm.com>

In order to be able to handle IPI directly from C code instead of
assembly code, introduce handle_IPI(), which is modeled after handle_IRQ().

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
 arch/arm/include/asm/smp.h |    5 +++++
 arch/arm/kernel/smp.c      |    5 +++++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/arch/arm/include/asm/smp.h b/arch/arm/include/asm/smp.h
index 674ebcd..0a17b62 100644
--- a/arch/arm/include/asm/smp.h
+++ b/arch/arm/include/asm/smp.h
@@ -33,6 +33,11 @@ extern void show_ipi_list(struct seq_file *, int);
 asmlinkage void do_IPI(int ipinr, struct pt_regs *regs);
 
 /*
+ * Called from C code, this handles an IPI.
+ */
+void handle_IPI(int ipinr, struct pt_regs *regs);
+
+/*
  * Setup the set of possible CPUs (via set_cpu_possible)
  */
 extern void smp_init_cpus(void);
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 3f12ce9..2e49f18 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -587,6 +587,11 @@ static void ipi_cpu_stop(unsigned int cpu)
  */
 asmlinkage void __exception_irq_entry do_IPI(int ipinr, struct pt_regs *regs)
 {
+	handle_IPI(ipinr, regs);
+}
+
+void handle_IPI(int ipinr, struct pt_regs *regs)
+{
 	unsigned int cpu = smp_processor_id();
 	struct pt_regs *old_regs = set_irq_regs(regs);
 
-- 
1.7.4.1

[PATCH 2/2] ARM: smp: Add a localtimer handler callable from C code

[Shawn Guo]

In order to be able to handle localtimer directly from C code instead of
assembly code, introduce handle_local_timer(), which is modeled after
handle_IRQ().

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
 arch/arm/include/asm/localtimer.h |    4 ++++
 arch/arm/kernel/smp.c             |    5 +++++
 2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/arm/include/asm/localtimer.h b/arch/arm/include/asm/localtimer.h
index 080d74f..3306f28 100644
--- a/arch/arm/include/asm/localtimer.h
+++ b/arch/arm/include/asm/localtimer.h
@@ -22,6 +22,10 @@ void percpu_timer_setup(void);
  */
 asmlinkage void do_local_timer(struct pt_regs *);
 
+/*
+ * Called from C code
+ */
+void handle_local_timer(struct pt_regs *);
 
 #ifdef CONFIG_LOCAL_TIMERS
 
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 2e49f18..0949007 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -480,6 +480,11 @@ static void ipi_timer(void)
 #ifdef CONFIG_LOCAL_TIMERS
 asmlinkage void __exception_irq_entry do_local_timer(struct pt_regs *regs)
 {
+	handle_local_timer(regs);
+}
+
+void handle_local_timer(struct pt_regs *regs)
+{
 	struct pt_regs *old_regs = set_irq_regs(regs);
 	int cpu = smp_processor_id();
 
-- 
1.7.4.1

[PATCH 0/2] Make IPI and localtimer handlers callable from C code

[Shawn Guo]

On Sun, Oct 02, 2011 at 04:56:59PM +0800, Shawn Guo wrote:
> [Sorry for send you twice, Russell, Marc.  I forgot cc LAKML last time.]
> 
> With imx sub-architecture is moving to MULTI_IRQ_HANDLER, imx6q has to
> get a local gic_handler_irq() implementation calling IPI and localtimer
> handlers from C code, before Marc's global gic_handler_irq() series gets
> merged.
> 
> This patch series changes the original __exception_irq_entry to a
> wrapper for actual IPI and localtimer handlers which are callable from
> C code now.
> 
> Marc Zyngier (1):
>      ARM: smp: Add an IPI handler callable from C code
> 
> Shawn Guo (1):
>      ARM: smp: Add a localtimer handler callable from C code
> 
>  arch/arm/include/asm/localtimer.h |    4 ++++
>  arch/arm/include/asm/smp.h        |    5 +++++
>  arch/arm/kernel/smp.c             |   10 ++++++++++
>  3 files changed, 19 insertions(+), 0 deletions(-)
> 
Hi Russell,

Do you have any comment on these two patches?  Otherwise, I will put
them into patch track system.

-- 
Regards,
Shawn

[PATCH 0/2] Make IPI and localtimer handlers callable from C code

[Russell King - ARM Linux]

On Thu, Oct 06, 2011 at 10:10:24PM +0800, Shawn Guo wrote:
> Do you have any comment on these two patches?  Otherwise, I will put
> them into patch track system.

No comment, they look fine, thanks.