linux-kernel - [PATCH v4 05/10] MIPS: smp: Implement IPI stats

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Message-Id: <20240907-b4-mips-ipi-improvements-v4-5-ac288f9aff0b@flygoat.com>
Date: Sat, 07 Sep 2024 12:48:11 +0100
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
 Florian Fainelli <florian.fainelli@...adcom.com>, 
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, 
 Huacai Chen <chenhuacai@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Serge Semin <fancer.lancer@...il.com>, Paul Burton <paulburton@...nel.org>
Cc: linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH v4 05/10] MIPS: smp: Implement IPI stats

Show IPI statistics in arch_show_interrupts to help users
analysis IPI performance.

Tested-by: Serge Semin <fancer.lancer@...il.com>
Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 arch/mips/include/asm/ipi.h |  9 +++++++++
 arch/mips/kernel/irq.c      |  4 ++++
 arch/mips/kernel/smp.c      | 13 +++++++++++++
 3 files changed, 26 insertions(+)

diff --git a/arch/mips/include/asm/ipi.h b/arch/mips/include/asm/ipi.h
index 7cac0f4ccf37..7d310012962f 100644
--- a/arch/mips/include/asm/ipi.h
+++ b/arch/mips/include/asm/ipi.h
@@ -36,6 +36,7 @@ void mips_smp_ipi_disable(void);
 extern bool mips_smp_ipi_have_virq_range(void);
 void mips_smp_ipi_set_irqdomain(struct irq_domain *d);
 extern void mips_smp_ipi_set_virq_range(int virq, int nr);
+extern void mips_smp_show_ipi_stats(struct seq_file *p, int prec);
 #else
 static inline void mips_smp_ipi_enable(void)
 {
@@ -44,6 +45,10 @@ static inline void mips_smp_ipi_enable(void)
 static inline void mips_smp_ipi_disable(void)
 {
 }
+
+static inline void mips_smp_show_ipi_stats(struct seq_file *p, int prec)
+{
+}
 #endif /* CONFIG_GENERIC_IRQ_IPI */
 #else
 static inline void mips_smp_ipi_set_virq_range(int virq, int nr)
@@ -58,5 +63,9 @@ static inline bool mips_smp_ipi_have_virq_range(void)
 {
 	return false;
 }
+
+static inline void mips_smp_show_ipi_stats(struct seq_file *p, int prec)
+{
+}
 #endif /* CONFIG_SMP */
 #endif
diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c
index 5e11582fe308..c3ea8d80e0cb 100644
--- a/arch/mips/kernel/irq.c
+++ b/arch/mips/kernel/irq.c
@@ -26,6 +26,8 @@
 #include <linux/atomic.h>
 #include <linux/uaccess.h>
 
+#include <asm/ipi.h>
+
 void *irq_stack[NR_CPUS];
 
 /*
@@ -42,6 +44,8 @@ atomic_t irq_err_count;
 int arch_show_interrupts(struct seq_file *p, int prec)
 {
 	seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
+	mips_smp_show_ipi_stats(p, prec);
+
 	return 0;
 }
 
diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 81ae65f21f73..aa02ca2e0fcf 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -243,6 +243,19 @@ void mips_smp_ipi_disable(void)
 		disable_percpu_irq(ipi_virqs[i]);
 }
 
+void mips_smp_show_ipi_stats(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, "%10u ", irq_desc_kstat_cpu(ipi_desc[i], cpu));
+		seq_printf(p, " %s\n", ipi_names[i]);
+	}
+}
+
 static void smp_ipi_init_one(unsigned int virq, const char *name,
 			     irq_handler_t handler)
 {

-- 
2.46.0