[PATCH v3 14/16] arm64: Remove custom IRQ stat accounting

Marc Zyngier
2020-09-01T14:52:41Z

Let's switch the arm64 code to the core accounting, which already
does everything we need.

Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/include/asm/hardirq.h | 9 ---------
arch/arm64/kernel/smp.c | 24 ++++++------------------
2 files changed, 6 insertions(+), 27 deletions(-)

diff --git a/arch/arm64/include/asm/hardirq.h b/arch/arm64/include/asm/hardirq.h
index 985493af704b..5ffa4bacdad3 100644
--- a/arch/arm64/include/asm/hardirq.h
+++ b/arch/arm64/include/asm/hardirq.h
@@ -13,21 +13,12 @@
#include <asm/kvm_arm.h>
#include <asm/sysreg.h>

-#define NR_IPI 7
-
typedef struct {
unsigned int __softirq_pending;
- unsigned int ipi_irqs[NR_IPI];
} ____cacheline_aligned irq_cpustat_t;

#include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */

-#define __inc_irq_stat(cpu, member) __IRQ_STAT(cpu, member)++
-#define __get_irq_stat(cpu, member) __IRQ_STAT(cpu, member)
-
-u64 smp_irq_stat_cpu(unsigned int cpu);
-#define arch_irq_stat_cpu smp_irq_stat_cpu
-
#define __ARCH_IRQ_EXIT_IRQS_DISABLED 1

struct nmi_ctx {
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 58fb155fb0ab..07b45466e0bb 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -72,7 +72,8 @@ enum ipi_msg_type {
IPI_CPU_CRASH_STOP,
IPI_TIMER,
IPI_IRQ_WORK,
- IPI_WAKEUP
+ IPI_WAKEUP,
+ NR_IPI
};

static int ipi_irq_base __read_mostly;
@@ -800,26 +801,15 @@ void show_ipi_list(struct seq_file *p, int prec)
unsigned int cpu, i;

for (i = 0; i < NR_IPI; i++) {
+ unsigned int irq = irq_desc_get_irq(ipi_desc[i]);
seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i,
prec >= 4 ? " " : "");
for_each_online_cpu(cpu)
- seq_printf(p, "%10u ",
- __get_irq_stat(cpu, ipi_irqs[i]));
+ seq_printf(p, "%10u ", kstat_irqs_cpu(irq, cpu));
seq_printf(p, " %s\n", ipi_types[i]);
}
}

-u64 smp_irq_stat_cpu(unsigned int cpu)
-{
- u64 sum = 0;
- int i;
-
- for (i = 0; i < NR_IPI; i++)
- sum += __get_irq_stat(cpu, ipi_irqs[i]);
-
- return sum;
-}
-
void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
smp_cross_call(mask, IPI_CALL_FUNC);
@@ -892,10 +882,8 @@ static void do_handle_IPI(int ipinr)
{
unsigned int cpu = smp_processor_id();

- if ((unsigned)ipinr < NR_IPI) {
+ if ((unsigned)ipinr < NR_IPI)
trace_ipi_entry_rcuidle(ipi_types[ipinr]);
- __inc_irq_stat(cpu, ipi_irqs[ipinr]);
- }

switch (ipinr) {
case IPI_RESCHEDULE:
@@ -992,7 +980,7 @@ void __init set_smp_ipi_range(int ipi_base, int n)
int err;

err = request_percpu_irq(ipi_base + i, ipi_handler,
- "IPI", &irq_stat);
+ "IPI", &cpu_number);
WARN_ON(err);

ipi_desc[i] = irq_to_desc(ipi_base + i);
--
2.27.0