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Date: Tue, 2 Oct 2018 12:17:50 -0700
From: Atish Patra <atish.patra@....com>
To: Palmer Dabbelt <palmer@...ive.com>,
"anup@...infault.org" <anup@...infault.org>
Cc: "aou@...s.berkeley.edu" <aou@...s.berkeley.edu>,
Christoph Hellwig <hch@...radead.org>,
"linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] RISC-V: Show IPI stats
On 10/1/18 9:42 AM, Palmer Dabbelt wrote:
> On Fri, 28 Sep 2018 23:26:05 PDT (-0700), anup@...infault.org wrote:
>> 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@...infault.org>
>>
>> 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
>
> Reviewed-by: Palmer Dabbelt <palmer@...ive.com>
>
> This is going in through Atish's patch set.
>
Sent.
Regards,
Atish
>>
>> ---
>> arch/riscv/include/asm/smp.h | 9 +++++++++
>> arch/riscv/kernel/irq.c | 8 ++++++++
>> arch/riscv/kernel/smp.c | 39 +++++++++++++++++++++++++++++-------
>> 3 files changed, 49 insertions(+), 7 deletions(-)
>>
>> diff --git a/arch/riscv/include/asm/smp.h b/arch/riscv/include/asm/smp.h
>> index fce312ce3516..5278ae8f1346 100644
>> --- a/arch/riscv/include/asm/smp.h
>> +++ b/arch/riscv/include/asm/smp.h
>> @@ -25,8 +25,13 @@
>> extern unsigned long __cpuid_to_hardid_map[NR_CPUS];
>> #define cpuid_to_hardid_map(cpu) __cpuid_to_hardid_map[cpu]
>>
>> +struct seq_file;
>> +
>> #ifdef CONFIG_SMP
>>
>> +/* print IPI stats */
>> +void show_ipi_stats(struct seq_file *p, int prec);
>> +
>> /* SMP initialization hook for setup_arch */
>> void __init setup_smp(void);
>>
>> @@ -47,6 +52,10 @@ void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out);
>>
>> #else
>>
>> +static inline void show_ipi_stats(struct seq_file *p, int prec)
>> +{
>> +}
>> +
>> static inline int riscv_hartid_to_cpuid(int hartid)
>> {
>> return 0;
>> diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c
>> index ca4593317e45..48e6b7db83a1 100644
>> --- a/arch/riscv/kernel/irq.c
>> +++ b/arch/riscv/kernel/irq.c
>> @@ -8,6 +8,8 @@
>> #include <linux/interrupt.h>
>> #include <linux/irqchip.h>
>> #include <linux/irqdomain.h>
>> +#include <linux/seq_file.h>
>> +#include <asm/smp.h>
>>
>> /*
>> * Possible interrupt causes:
>> @@ -24,6 +26,12 @@
>> */
>> #define INTERRUPT_CAUSE_FLAG (1UL << (__riscv_xlen - 1))
>>
>> +int arch_show_interrupts(struct seq_file *p, int prec)
>> +{
>> + show_ipi_stats(p, prec);
>> + return 0;
>> +}
>> +
>> asmlinkage void __irq_entry do_IRQ(struct pt_regs *regs)
>> {
>> struct pt_regs *old_regs = set_irq_regs(regs);
>> diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
>> index 89d95866f562..686fa7a427ff 100644
>> --- a/arch/riscv/kernel/smp.c
>> +++ b/arch/riscv/kernel/smp.c
>> @@ -22,22 +22,24 @@
>> #include <linux/interrupt.h>
>> #include <linux/smp.h>
>> #include <linux/sched.h>
>> +#include <linux/seq_file.h>
>>
>> #include <asm/sbi.h>
>> #include <asm/tlbflush.h>
>> #include <asm/cacheflush.h>
>>
>> -/* A collection of single bit ipi messages. */
>> -static struct {
>> - unsigned long bits ____cacheline_aligned;
>> -} ipi_data[NR_CPUS] __cacheline_aligned;
>> -
>> enum ipi_message_type {
>> IPI_RESCHEDULE,
>> IPI_CALL_FUNC,
>> IPI_MAX
>> };
>>
>> +/* A collection of single bit ipi messages. */
>> +static struct {
>> + unsigned long stats[IPI_MAX] ____cacheline_aligned;
>> + unsigned long bits ____cacheline_aligned;
>> +} ipi_data[NR_CPUS] __cacheline_aligned;
>> +
>> int riscv_hartid_to_cpuid(int hartid)
>> {
>> int i = -1;
>> @@ -67,6 +69,7 @@ int setup_profiling_timer(unsigned int multiplier)
>> void riscv_software_interrupt(void)
>> {
>> unsigned long *pending_ipis = &ipi_data[smp_processor_id()].bits;
>> + unsigned long *stats = ipi_data[smp_processor_id()].stats;
>>
>> /* Clear pending IPI */
>> csr_clear(sip, SIE_SSIE);
>> @@ -81,11 +84,15 @@ void riscv_software_interrupt(void)
>> if (ops == 0)
>> return;
>>
>> - 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();
>> + }
>>
>> BUG_ON((ops >> IPI_MAX) != 0);
>>
>> @@ -111,6 +118,24 @@ send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation)
>> sbi_send_ipi(cpumask_bits(&hartid_mask));
>> }
>>
>> +static const char *ipi_names[] = {
>> + [IPI_RESCHEDULE] = "Rescheduling interrupts",
>> + [IPI_CALL_FUNC] = "Function call interrupts",
>> +};
>> +
>> +void 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, "%10lu ", ipi_data[cpu].stats[i]);
>> + seq_printf(p, " %s\n", ipi_names[i]);
>> + }
>> +}
>> +
>> void arch_send_call_function_ipi_mask(struct cpumask *mask)
>> {
>> send_ipi_message(mask, IPI_CALL_FUNC);
>
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