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ARC: smp: Introduce smp hook @init_irq_cpu called for all cores

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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>
This commit is contained in:
Vineet Gupta 2015-10-14 14:38:02 +05:30
parent 8721a7f5a6
commit 286130ebf1
3 changed files with 12 additions and 1 deletions
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3
arch/arc/include/asm/smp.h
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@ -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 * @init_early_smp: A SMP specific h/w block can init itself
* Could be common across platforms so not covered by * Could be common across platforms so not covered by
* mach_desc->init_early() * 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) * @cpu_kick: For Master to kickstart a cpu (optionally at a PC)
* @ipi_send: To send IPI to a @cpu * @ipi_send: To send IPI to a @cpu
* @ips_clear: To clear IPI received at @irq * @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 { struct plat_smp_ops {
const char *info; const char *info;
void (*init_early_smp)(void); void (*init_early_smp)(void);
void (*init_irq_cpu)(int cpu);
void (*cpu_kick)(int cpu, unsigned long pc); void (*cpu_kick)(int cpu, unsigned long pc);
void (*ipi_send)(int cpu); void (*ipi_send)(int cpu);
void (*ipi_clear)(int irq); void (*ipi_clear)(int irq);

6
arch/arc/kernel/irq.c
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@ -10,6 +10,7 @@
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/irqchip.h> #include <linux/irqchip.h>
#include <asm/mach_desc.h> #include <asm/mach_desc.h>
#include <asm/smp.h>
/* /*
* Late Interrupt system init called from start_kernel for Boot CPU only * Late Interrupt system init called from start_kernel for Boot CPU only
@ -27,7 +28,10 @@ void __init init_IRQ(void)
irqchip_init(); irqchip_init();
#ifdef CONFIG_SMP #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) if (machine_desc->init_cpu_smp)
machine_desc->init_cpu_smp(smp_processor_id()); machine_desc->init_cpu_smp(smp_processor_id());
#endif #endif

4
arch/arc/kernel/smp.c
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@ -131,6 +131,10 @@ void start_kernel_secondary(void)
pr_info("## CPU%u LIVE ##: Executing Code...\n", cpu); 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) if (machine_desc->init_cpu_smp)
machine_desc->init_cpu_smp(cpu); machine_desc->init_cpu_smp(cpu);