From e6169c4b4413f97cc36ceebc8dd6d2518f341d0f Mon Sep 17 00:00:00 2001 From: Guo Ren Date: Fri, 31 Jul 2020 00:21:41 +0000 Subject: 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: Guo Ren Cc: Arnd Bergmann --- 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 60f2ab1c5865..e7425e6b0419 100644 --- a/arch/csky/kernel/smp.c +++ b/arch/csky/kernel/smp.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include #include @@ -27,11 +28,6 @@ #include #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); -- cgit v1.2.3