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MIPS: Add generic SMP IPI support

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Use the new generic IPI layer to provide generic SMP IPI support if the irqchip
supports it.

Signed-off-by: Qais Yousef <qais.yousef@imgtec.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: <jason@lakedaemon.net>
Cc: <marc.zyngier@arm.com>
Cc: <jiang.liu@linux.intel.com>
Cc: <linux-mips@linux-mips.org>
Cc: <lisa.parratt@imgtec.com>
Cc: Qais Yousef <qsyousef@gmail.com>
Link: http://lkml.kernel.org/r/1449580830-23652-17-git-send-email-qais.yousef@imgtec.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Qais Yousef 2015-12-08 13:20:27 +00:00 committed by Thomas Gleixner
parent 78930f09b9
commit fbde2d7d82
1 changed files with 136 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

136
arch/mips/kernel/smp.c
View file

@ -33,12 +33,16 @@
#include <linux/cpu.h>
#include <linux/err.h>
#include <linux/ftrace.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/atomic.h>
#include <asm/cpu.h>
#include <asm/processor.h>
#include <asm/idle.h>
#include <asm/r4k-timer.h>
#include <asm/mips-cpc.h>
#include <asm/mmu_context.h>
#include <asm/time.h>
#include <asm/setup.h>
@ -79,6 +83,11 @@ static cpumask_t cpu_core_setup_map;
cpumask_t cpu_coherent_mask;
#ifdef CONFIG_GENERIC_IRQ_IPI
static struct irq_desc *call_desc;
static struct irq_desc *sched_desc;
#endif
static inline void set_cpu_sibling_map(int cpu)
{
int i;
@ -145,6 +154,133 @@ void register_smp_ops(struct plat_smp_ops *ops)
mp_ops = ops;
}
#ifdef CONFIG_GENERIC_IRQ_IPI
void mips_smp_send_ipi_single(int cpu, unsigned int action)
{
mips_smp_send_ipi_mask(cpumask_of(cpu), action);
}
void mips_smp_send_ipi_mask(const struct cpumask *mask, unsigned int action)
{
unsigned long flags;
unsigned int core;
int cpu;
local_irq_save(flags);
switch (action) {
case SMP_CALL_FUNCTION:
__ipi_send_mask(call_desc, mask);
break;
case SMP_RESCHEDULE_YOURSELF:
__ipi_send_mask(sched_desc, mask);
break;
default:
BUG();
}
if (mips_cpc_present()) {
for_each_cpu(cpu, mask) {
core = cpu_data[cpu].core;
if (core == current_cpu_data.core)
continue;
while (!cpumask_test_cpu(cpu, &cpu_coherent_mask)) {
mips_cpc_lock_other(core);
write_cpc_co_cmd(CPC_Cx_CMD_PWRUP);
mips_cpc_unlock_other();
}
}
}
local_irq_restore(flags);
}
static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
{
scheduler_ipi();
return IRQ_HANDLED;
}
static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
{
generic_smp_call_function_interrupt();
return IRQ_HANDLED;
}
static struct irqaction irq_resched = {
.handler = ipi_resched_interrupt,
.flags = IRQF_PERCPU,
.name = "IPI resched"
};
static struct irqaction irq_call = {
.handler = ipi_call_interrupt,
.flags = IRQF_PERCPU,
.name = "IPI call"
};
static __init void smp_ipi_init_one(unsigned int virq,
struct irqaction *action)
{
int ret;
irq_set_handler(virq, handle_percpu_irq);
ret = setup_irq(virq, action);
BUG_ON(ret);
}
static int __init mips_smp_ipi_init(void)
{
unsigned int call_virq, sched_virq;
struct irq_domain *ipidomain;
struct device_node *node;
node = of_irq_find_parent(of_root);
ipidomain = irq_find_matching_host(node, DOMAIN_BUS_IPI);
/*
* Some platforms have half DT setup. So if we found irq node but
* didn't find an ipidomain, try to search for one that is not in the
* DT.
*/
if (node && !ipidomain)
ipidomain = irq_find_matching_host(NULL, DOMAIN_BUS_IPI);
BUG_ON(!ipidomain);
call_virq = irq_reserve_ipi(ipidomain, cpu_possible_mask);
BUG_ON(!call_virq);
sched_virq = irq_reserve_ipi(ipidomain, cpu_possible_mask);
BUG_ON(!sched_virq);
if (irq_domain_is_ipi_per_cpu(ipidomain)) {
int cpu;
for_each_cpu(cpu, cpu_possible_mask) {
smp_ipi_init_one(call_virq + cpu, &irq_call);
smp_ipi_init_one(sched_virq + cpu, &irq_resched);
}
} else {
smp_ipi_init_one(call_virq, &irq_call);
smp_ipi_init_one(sched_virq, &irq_resched);
}
call_desc = irq_to_desc(call_virq);
sched_desc = irq_to_desc(sched_virq);
return 0;
}
early_initcall(mips_smp_ipi_init);
#endif
/*
* First C code run on the secondary CPUs after being started up by
* the master.