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Date: Sat, 1 Aug 2020 01:14:12 +0000
From: guoren@...nel.org
To: guoren@...nel.org, arnd@...db.de
Cc: linux-kernel@...r.kernel.org, linux-csky@...r.kernel.org,
linux-arch@...r.kernel.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: [PATCH 12/13] csky: Add arch_show_interrupts for IPI interrupts
From: Guo Ren <guoren@...ux.alibaba.com>
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: Guo Ren <guoren@...ux.alibaba.com>
Cc: Arnd Bergmann <arnd@...db.de>
---
arch/csky/kernel/smp.c | 49 +++++++++++++++++++++++++++++++++++++++++--------
1 file changed, 41 insertions(+), 8 deletions(-)
diff --git a/arch/csky/kernel/smp.c b/arch/csky/kernel/smp.c
index 60f2ab1..e7425e6 100644
--- a/arch/csky/kernel/smp.c
+++ b/arch/csky/kernel/smp.c
@@ -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);
--
2.7.4
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