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authorVineet Gupta <vgupta@synopsys.com>2015-10-14 12:08:02 +0300
committerVineet Gupta <vgupta@synopsys.com>2015-10-28 13:43:41 +0300
commit286130ebf196d9643800977d57bdb7cda266b49e (patch)
tree0048c504925232821d822b201a6f58b87f0b6e9f /arch/arc
parent8721a7f5a6f95c38cacbe1be22c820a7698926ef (diff)
downloadlinux-286130ebf196d9643800977d57bdb7cda266b49e.tar.xz
ARC: smp: Introduce smp hook @init_irq_cpu called for all cores
Note this is not part of platform owned static machine_desc, but more of device owned plat_smp_ops (rather misnamed) which a IPI provider or some such typically defines. This will help us seperate out the IPI registration from platform specific init_cpu_smp() into device specific init_irq_cpu() Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/include/asm/smp.h3
-rw-r--r--arch/arc/kernel/irq.c6
-rw-r--r--arch/arc/kernel/smp.c4
3 files changed, 12 insertions, 1 deletions
diff --git a/arch/arc/include/asm/smp.h b/arch/arc/include/asm/smp.h
index 5ea4cf8cd1a8..133c867d15af 100644
--- a/arch/arc/include/asm/smp.h
+++ b/arch/arc/include/asm/smp.h
@@ -48,6 +48,8 @@ extern int smp_ipi_irq_setup(int cpu, int irq);
* @init_early_smp: A SMP specific h/w block can init itself
* Could be common across platforms so not covered by
* mach_desc->init_early()
+ * @init_irq_cpu: Called for each core so SMP h/w block driver can do
+ * any needed setup per cpu (e.g. IPI request)
* @cpu_kick: For Master to kickstart a cpu (optionally at a PC)
* @ipi_send: To send IPI to a @cpu
* @ips_clear: To clear IPI received at @irq
@@ -55,6 +57,7 @@ extern int smp_ipi_irq_setup(int cpu, int irq);
struct plat_smp_ops {
const char *info;
void (*init_early_smp)(void);
+ void (*init_irq_cpu)(int cpu);
void (*cpu_kick)(int cpu, unsigned long pc);
void (*ipi_send)(int cpu);
void (*ipi_clear)(int irq);
diff --git a/arch/arc/kernel/irq.c b/arch/arc/kernel/irq.c
index 1dd8f2685afc..2ee226546c6a 100644
--- a/arch/arc/kernel/irq.c
+++ b/arch/arc/kernel/irq.c
@@ -10,6 +10,7 @@
#include <linux/interrupt.h>
#include <linux/irqchip.h>
#include <asm/mach_desc.h>
+#include <asm/smp.h>
/*
* Late Interrupt system init called from start_kernel for Boot CPU only
@@ -27,7 +28,10 @@ void __init init_IRQ(void)
irqchip_init();
#ifdef CONFIG_SMP
- /* Master CPU can initialize it's side of IPI */
+ /* a SMP H/w block could do IPI IRQ request here */
+ if (plat_smp_ops.init_irq_cpu)
+ plat_smp_ops.init_irq_cpu(smp_processor_id());
+
if (machine_desc->init_cpu_smp)
machine_desc->init_cpu_smp(smp_processor_id());
#endif
diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c
index 35ee18f1de58..580587805fa3 100644
--- a/arch/arc/kernel/smp.c
+++ b/arch/arc/kernel/smp.c
@@ -131,6 +131,10 @@ void start_kernel_secondary(void)
pr_info("## CPU%u LIVE ##: Executing Code...\n", cpu);
+ /* Some SMP H/w setup - for each cpu */
+ if (plat_smp_ops.init_irq_cpu)
+ plat_smp_ops.init_irq_cpu(cpu);
+
if (machine_desc->init_cpu_smp)
machine_desc->init_cpu_smp(cpu);