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RISC-V: Show IPI stats
This patch provides arch_show_interrupts() implementation to show IPI stats via /proc/interrupts. Now the contents of /proc/interrupts" will look like below: CPU0 CPU1 CPU2 CPU3 8: 17 7 6 14 SiFive PLIC 8 virtio0 10: 10 10 9 11 SiFive PLIC 10 ttyS0 IPI0: 170 673 251 79 Rescheduling interrupts IPI1: 1 12 27 1 Function call interrupts Signed-off-by: Anup Patel <anup@brainfault.org> [Atish - Fixed checkpatch errors] Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Palmer Dabbelt <palmer@sifive.com> Changes since v2: - Remove use of IPI_CALL_WAKEUP because it's being removed Changes since v1: - Add stub inline show_ipi_stats() function for !CONFIG_SMP - Make ipi_names[] dynamically sized at compile time - Minor beautification of ipi_names[] using tabs Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
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3 changed files with 49 additions and 7 deletions
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@ -25,8 +25,13 @@
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extern unsigned long __cpuid_to_hartid_map[NR_CPUS];
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#define cpuid_to_hartid_map(cpu) __cpuid_to_hartid_map[cpu]
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struct seq_file;
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#ifdef CONFIG_SMP
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/* print IPI stats */
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void show_ipi_stats(struct seq_file *p, int prec);
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/* SMP initialization hook for setup_arch */
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void __init setup_smp(void);
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@ -47,6 +52,10 @@ void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out);
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#else
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static inline void show_ipi_stats(struct seq_file *p, int prec)
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{
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}
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static inline int riscv_hartid_to_cpuid(int hartid)
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{
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return 0;
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@ -8,6 +8,8 @@
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#include <linux/interrupt.h>
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#include <linux/irqchip.h>
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#include <linux/irqdomain.h>
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#include <linux/seq_file.h>
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#include <asm/smp.h>
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/*
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* Possible interrupt causes:
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@ -24,6 +26,12 @@
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*/
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#define INTERRUPT_CAUSE_FLAG (1UL << (__riscv_xlen - 1))
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int arch_show_interrupts(struct seq_file *p, int prec)
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{
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show_ipi_stats(p, prec);
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return 0;
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}
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asmlinkage void __irq_entry do_IRQ(struct pt_regs *regs)
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{
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struct pt_regs *old_regs = set_irq_regs(regs);
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@ -22,22 +22,24 @@
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#include <linux/interrupt.h>
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#include <linux/smp.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <asm/sbi.h>
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#include <asm/tlbflush.h>
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#include <asm/cacheflush.h>
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/* A collection of single bit ipi messages. */
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static struct {
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unsigned long bits ____cacheline_aligned;
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} ipi_data[NR_CPUS] __cacheline_aligned;
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enum ipi_message_type {
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IPI_RESCHEDULE,
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IPI_CALL_FUNC,
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IPI_MAX
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};
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/* A collection of single bit ipi messages. */
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static struct {
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unsigned long stats[IPI_MAX] ____cacheline_aligned;
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unsigned long bits ____cacheline_aligned;
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} ipi_data[NR_CPUS] __cacheline_aligned;
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int riscv_hartid_to_cpuid(int hartid)
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{
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int i = -1;
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@ -67,6 +69,7 @@ int setup_profiling_timer(unsigned int multiplier)
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void riscv_software_interrupt(void)
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{
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unsigned long *pending_ipis = &ipi_data[smp_processor_id()].bits;
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unsigned long *stats = ipi_data[smp_processor_id()].stats;
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/* Clear pending IPI */
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csr_clear(sip, SIE_SSIE);
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@ -81,11 +84,15 @@ void riscv_software_interrupt(void)
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if (ops == 0)
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return;
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if (ops & (1 << IPI_RESCHEDULE))
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if (ops & (1 << IPI_RESCHEDULE)) {
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stats[IPI_RESCHEDULE]++;
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scheduler_ipi();
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}
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if (ops & (1 << IPI_CALL_FUNC))
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if (ops & (1 << IPI_CALL_FUNC)) {
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stats[IPI_CALL_FUNC]++;
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generic_smp_call_function_interrupt();
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}
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BUG_ON((ops >> IPI_MAX) != 0);
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@ -111,6 +118,24 @@ send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation)
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sbi_send_ipi(cpumask_bits(&hartid_mask));
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}
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static const char * const ipi_names[] = {
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[IPI_RESCHEDULE] = "Rescheduling interrupts",
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[IPI_CALL_FUNC] = "Function call interrupts",
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};
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void show_ipi_stats(struct seq_file *p, int prec)
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{
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unsigned int cpu, i;
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for (i = 0; i < IPI_MAX; i++) {
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seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i,
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prec >= 4 ? " " : "");
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for_each_online_cpu(cpu)
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seq_printf(p, "%10lu ", ipi_data[cpu].stats[i]);
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seq_printf(p, " %s\n", ipi_names[i]);
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}
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}
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void arch_send_call_function_ipi_mask(struct cpumask *mask)
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{
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send_ipi_message(mask, IPI_CALL_FUNC);
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