Commit e6169c4b authored by Guo Ren's avatar Guo Ren
Browse files

csky: Add arch_show_interrupts for IPI interrupts 



Here is the result:

 cat /proc/interrupts
           CPU0       CPU1       CPU2       CPU3
 15:       1348       1299        952       1076  C-SKY SMP Intc  15  IPI Interrupt
 16:       1203       1825       1598       1307  C-SKY SMP Intc  16  csky_mp_timer
 43:        292          0          0          0  C-SKY SMP Intc  43  ttyS0
 57:        106          0          0          0  C-SKY SMP Intc  57  virtio0
IPI0:         0          0          0          0  Empty interrupts
IPI1:        19         41         45         27  Rescheduling interrupts
IPI2:      1330       1259        908       1050  Function call interrupts
IPI3:         0          0          0          0  Irq work interrupts

Signed-off-by: default avatarGuo Ren <guoren@linux.alibaba.com>
Cc: Arnd Bergmann <arnd@arndb.de>
parent 2c81b076

arch/csky/kernel/smp.c

+41 −8
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 
#include <linux/irq_work.h>

#include <linux/irqdomain.h>

#include <linux/of.h>

#include <linux/seq_file.h>

#include <linux/sched/task_stack.h>

#include <linux/sched/mm.h>

#include <linux/sched/hotplug.h>
@@ -27,11 +28,6 @@ 
#include <abi/fpu.h>

#endif



struct ipi_data_struct {

	unsigned long bits ____cacheline_aligned;

};

static DEFINE_PER_CPU(struct ipi_data_struct, ipi_data);



enum ipi_message_type {

	IPI_EMPTY,

	IPI_RESCHEDULE,
@@ -40,8 +36,16 @@ enum ipi_message_type { 
	IPI_MAX

};



struct ipi_data_struct {

	unsigned long bits ____cacheline_aligned;

	unsigned long stats[IPI_MAX] ____cacheline_aligned;

};

static DEFINE_PER_CPU(struct ipi_data_struct, ipi_data);



static irqreturn_t handle_ipi(int irq, void *dev)

{

	unsigned long *stats = this_cpu_ptr(&ipi_data)->stats;



	while (true) {

		unsigned long ops;
@@ -49,14 +53,20 @@ static irqreturn_t handle_ipi(int irq, void *dev) 
		if (ops == 0)

			return IRQ_HANDLED;



		if (ops & (1 << IPI_RESCHEDULE))

		if (ops & (1 << IPI_RESCHEDULE)) {

			stats[IPI_RESCHEDULE]++;

			scheduler_ipi();

		}



		if (ops & (1 << IPI_CALL_FUNC))

		if (ops & (1 << IPI_CALL_FUNC)) {

			stats[IPI_CALL_FUNC]++;

			generic_smp_call_function_interrupt();

		}



		if (ops & (1 << IPI_IRQ_WORK))

		if (ops & (1 << IPI_IRQ_WORK)) {

			stats[IPI_IRQ_WORK]++;

			irq_work_run();

		}



		BUG_ON((ops >> IPI_MAX) != 0);

	}
@@ -88,6 +98,29 @@ send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation) 
	send_arch_ipi(to_whom);

}



static const char * const ipi_names[] = {

	[IPI_EMPTY]		= "Empty interrupts",

	[IPI_RESCHEDULE]	= "Rescheduling interrupts",

	[IPI_CALL_FUNC]		= "Function call interrupts",

	[IPI_IRQ_WORK]		= "Irq work interrupts",

};



int arch_show_interrupts(struct seq_file *p, int prec)

{

	unsigned int cpu, i;



	for (i = 0; i < IPI_MAX; i++) {

		seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i,

			   prec >= 4 ? " " : "");

		for_each_online_cpu(cpu)

			seq_printf(p, "%10lu ",

				per_cpu_ptr(&ipi_data, cpu)->stats[i]);

		seq_printf(p, " %s\n", ipi_names[i]);

	}



	return 0;

}



void arch_send_call_function_ipi_mask(struct cpumask *mask)

{

	send_ipi_message(mask, IPI_CALL_FUNC);

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