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genirq: Convert kstat_irqs to a struct

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The irq_desc::kstat_irqs member is a per-CPU variable of type int, which is
only capable of counting. A snapshot mechanism for interrupt statistics
will be added soon, which requires an additional variable to store the
snapshot.

To facilitate expansion, convert kstat_irqs here to a struct containing
only the count.

Originally-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Bitao Hu <yaoma@linux.alibaba.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240411074134.30922-2-yaoma@linux.alibaba.com
This commit is contained in:
Bitao Hu 2024-04-11 15:41:30 +08:00 committed by Thomas Gleixner
parent 81e4cb0fd4
commit 86d2a2f51f
8 changed files with 23 additions and 17 deletions
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2
arch/mips/dec/setup.c
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@ -756,7 +756,7 @@ void __init arch_init_irq(void)
NULL))
pr_err("Failed to register fpu interrupt\n");
desc_fpu = irq_to_desc(irq_fpu);
fpu_kstat_irq = this_cpu_ptr(desc_fpu->kstat_irqs);
fpu_kstat_irq = this_cpu_ptr(&desc_fpu->kstat_irqs->cnt);
}
if (dec_interrupt[DEC_IRQ_CASCADE] >= 0) {
if (request_irq(dec_interrupt[DEC_IRQ_CASCADE], no_action,

2
arch/parisc/kernel/smp.c
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@ -344,7 +344,7 @@ static int smp_boot_one_cpu(int cpuid, struct task_struct *idle)
struct irq_desc *desc = irq_to_desc(i);
if (desc && desc->kstat_irqs)
*per_cpu_ptr(desc->kstat_irqs, cpuid) = 0;
*per_cpu_ptr(desc->kstat_irqs, cpuid) = (struct irqstat) { };
}
#endif

2
arch/powerpc/kvm/book3s_hv_rm_xics.c
View File

@ -837,7 +837,7 @@ static inline void this_cpu_inc_rm(unsigned int __percpu *addr)
*/
static void kvmppc_rm_handle_irq_desc(struct irq_desc *desc)
{
this_cpu_inc_rm(desc->kstat_irqs);
this_cpu_inc_rm(&desc->kstat_irqs->cnt);
__this_cpu_inc(kstat.irqs_sum);
}

12
include/linux/irqdesc.h
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@ -17,6 +17,14 @@ struct irq_desc;
struct irq_domain;
struct pt_regs;
/**
* struct irqstat - interrupt statistics
* @cnt: real-time interrupt count
*/
struct irqstat {
unsigned int cnt;
};
/**
* struct irq_desc - interrupt descriptor
* @irq_common_data: per irq and chip data passed down to chip functions
@ -55,7 +63,7 @@ struct pt_regs;
struct irq_desc {
struct irq_common_data irq_common_data;
struct irq_data irq_data;
unsigned int __percpu *kstat_irqs;
struct irqstat __percpu *kstat_irqs;
irq_flow_handler_t handle_irq;
struct irqaction *action; /* IRQ action list */
unsigned int status_use_accessors;
@ -119,7 +127,7 @@ extern struct irq_desc irq_desc[NR_IRQS];
static inline unsigned int irq_desc_kstat_cpu(struct irq_desc *desc,
unsigned int cpu)
{
return desc->kstat_irqs ? *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
return desc->kstat_irqs ? per_cpu(desc->kstat_irqs->cnt, cpu) : 0;
}
static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)

2
kernel/irq/internals.h
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@ -258,7 +258,7 @@ static inline void irq_state_set_masked(struct irq_desc *desc)
static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc)
{
__this_cpu_inc(*desc->kstat_irqs);
__this_cpu_inc(desc->kstat_irqs->cnt);
__this_cpu_inc(kstat.irqs_sum);
}

9
kernel/irq/irqdesc.c
View File

@ -134,7 +134,7 @@ static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node,
desc->name = NULL;
desc->owner = owner;
for_each_possible_cpu(cpu)
*per_cpu_ptr(desc->kstat_irqs, cpu) = 0;
*per_cpu_ptr(desc->kstat_irqs, cpu) = (struct irqstat) { };
desc_smp_init(desc, node, affinity);
}
@ -186,7 +186,7 @@ static int init_desc(struct irq_desc *desc, int irq, int node,
const struct cpumask *affinity,
struct module *owner)
{
desc->kstat_irqs = alloc_percpu(unsigned int);
desc->kstat_irqs = alloc_percpu(struct irqstat);
if (!desc->kstat_irqs)
return -ENOMEM;
@ -968,8 +968,7 @@ unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
{
struct irq_desc *desc = irq_to_desc(irq);
return desc && desc->kstat_irqs ?
*per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
return desc && desc->kstat_irqs ? per_cpu(desc->kstat_irqs->cnt, cpu) : 0;
}
static bool irq_is_nmi(struct irq_desc *desc)
@ -991,7 +990,7 @@ static unsigned int kstat_irqs(unsigned int irq)
return data_race(desc->tot_count);
for_each_possible_cpu(cpu)
sum += data_race(*per_cpu_ptr(desc->kstat_irqs, cpu));
sum += data_race(per_cpu(desc->kstat_irqs->cnt, cpu));
return sum;
}

5
kernel/irq/proc.c
View File

@ -490,7 +490,7 @@ int show_interrupts(struct seq_file *p, void *v)
if (desc->kstat_irqs) {
for_each_online_cpu(j)
any_count |= data_race(*per_cpu_ptr(desc->kstat_irqs, j));
any_count |= data_race(per_cpu(desc->kstat_irqs->cnt, j));
}
if ((!desc->action || irq_desc_is_chained(desc)) && !any_count)
@ -498,8 +498,7 @@ int show_interrupts(struct seq_file *p, void *v)
seq_printf(p, "%*d: ", prec, i);
for_each_online_cpu(j)
seq_printf(p, "%10u ", desc->kstat_irqs ?
*per_cpu_ptr(desc->kstat_irqs, j) : 0);
seq_printf(p, "%10u ", desc->kstat_irqs ? per_cpu(desc->kstat_irqs->cnt, j) : 0);
raw_spin_lock_irqsave(&desc->lock, flags);
if (desc->irq_data.chip) {

6
scripts/gdb/linux/interrupts.py
View File

@ -37,7 +37,7 @@ def show_irq_desc(prec, irq):
any_count = 0
if desc['kstat_irqs']:
for cpu in cpus.each_online_cpu():
any_count += cpus.per_cpu(desc['kstat_irqs'], cpu)
any_count += cpus.per_cpu(desc['kstat_irqs'], cpu)['cnt']
if (desc['action'] == 0 or irq_desc_is_chained(desc)) and any_count == 0:
return text;
@ -45,7 +45,7 @@ def show_irq_desc(prec, irq):
text += "%*d: " % (prec, irq)
for cpu in cpus.each_online_cpu():
if desc['kstat_irqs']:
count = cpus.per_cpu(desc['kstat_irqs'], cpu)
count = cpus.per_cpu(desc['kstat_irqs'], cpu)['cnt']
else:
count = 0
text += "%10u" % (count)
@ -177,7 +177,7 @@ def arm_common_show_interrupts(prec):
if desc == 0:
continue
for cpu in cpus.each_online_cpu():
text += "%10u" % (cpus.per_cpu(desc['kstat_irqs'], cpu))
text += "%10u" % (cpus.per_cpu(desc['kstat_irqs'], cpu)['cnt'])
text += " %s" % (ipi_types[ipi].string())
text += "\n"
return text