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irqchip/mips-gic: Use raw spinlock for gic_lock
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Since we may hold gic_lock in hardirq context, use raw spinlock
makes more sense given that it is for low-level interrupt handling
routine and the critical section is small.

Fixes BUG:

[    0.426106] =============================
[    0.426257] [ BUG: Invalid wait context ]
[    0.426422] 6.3.0-rc7-next-20230421-dirty linux-sunxi#54 Not tainted
[    0.426638] -----------------------------
[    0.426766] swapper/0/1 is trying to lock:
[    0.426954] ffffffff8104e7b8 (gic_lock){....}-{3:3}, at: gic_set_type+0x30/08

Fixes: 95150ae ("irqchip: mips-gic: Implement irq_set_type callback")
Cc: stable@vger.kernel.org
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Tested-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230424103156.66753-3-jiaxun.yang@flygoat.com
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@FlyGoat
FlyGoat authored and Marc Zyngier committed May 16, 2023
1 parent 2c6c9c0 commit 3d6a0e4
Showing 1 changed file with 15 additions and 15 deletions.
30 changes: 15 additions & 15 deletions drivers/irqchip/irq-mips-gic.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,7 @@ void __iomem *mips_gic_base;

static DEFINE_PER_CPU_READ_MOSTLY(unsigned long[GIC_MAX_LONGS], pcpu_masks);

static DEFINE_SPINLOCK(gic_lock);
static DEFINE_RAW_SPINLOCK(gic_lock);
static struct irq_domain *gic_irq_domain;
static int gic_shared_intrs;
static unsigned int gic_cpu_pin;
Expand Down Expand Up @@ -210,7 +210,7 @@ static int gic_set_type(struct irq_data *d, unsigned int type)

irq = GIC_HWIRQ_TO_SHARED(d->hwirq);

spin_lock_irqsave(&gic_lock, flags);
raw_spin_lock_irqsave(&gic_lock, flags);
switch (type & IRQ_TYPE_SENSE_MASK) {
case IRQ_TYPE_EDGE_FALLING:
pol = GIC_POL_FALLING_EDGE;
Expand Down Expand Up @@ -250,7 +250,7 @@ static int gic_set_type(struct irq_data *d, unsigned int type)
else
irq_set_chip_handler_name_locked(d, &gic_level_irq_controller,
handle_level_irq, NULL);
spin_unlock_irqrestore(&gic_lock, flags);
raw_spin_unlock_irqrestore(&gic_lock, flags);

return 0;
}
Expand All @@ -268,7 +268,7 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
return -EINVAL;

/* Assumption : cpumask refers to a single CPU */
spin_lock_irqsave(&gic_lock, flags);
raw_spin_lock_irqsave(&gic_lock, flags);

/* Re-route this IRQ */
write_gic_map_vp(irq, BIT(mips_cm_vp_id(cpu)));
Expand All @@ -279,7 +279,7 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
set_bit(irq, per_cpu_ptr(pcpu_masks, cpu));

irq_data_update_effective_affinity(d, cpumask_of(cpu));
spin_unlock_irqrestore(&gic_lock, flags);
raw_spin_unlock_irqrestore(&gic_lock, flags);

return IRQ_SET_MASK_OK;
}
Expand Down Expand Up @@ -357,12 +357,12 @@ static void gic_mask_local_irq_all_vpes(struct irq_data *d)
cd = irq_data_get_irq_chip_data(d);
cd->mask = false;

spin_lock_irqsave(&gic_lock, flags);
raw_spin_lock_irqsave(&gic_lock, flags);
for_each_online_cpu(cpu) {
write_gic_vl_other(mips_cm_vp_id(cpu));
write_gic_vo_rmask(BIT(intr));
}
spin_unlock_irqrestore(&gic_lock, flags);
raw_spin_unlock_irqrestore(&gic_lock, flags);
}

static void gic_unmask_local_irq_all_vpes(struct irq_data *d)
Expand All @@ -375,12 +375,12 @@ static void gic_unmask_local_irq_all_vpes(struct irq_data *d)
cd = irq_data_get_irq_chip_data(d);
cd->mask = true;

spin_lock_irqsave(&gic_lock, flags);
raw_spin_lock_irqsave(&gic_lock, flags);
for_each_online_cpu(cpu) {
write_gic_vl_other(mips_cm_vp_id(cpu));
write_gic_vo_smask(BIT(intr));
}
spin_unlock_irqrestore(&gic_lock, flags);
raw_spin_unlock_irqrestore(&gic_lock, flags);
}

static void gic_all_vpes_irq_cpu_online(void)
Expand All @@ -393,7 +393,7 @@ static void gic_all_vpes_irq_cpu_online(void)
unsigned long flags;
int i;

spin_lock_irqsave(&gic_lock, flags);
raw_spin_lock_irqsave(&gic_lock, flags);

for (i = 0; i < ARRAY_SIZE(local_intrs); i++) {
unsigned int intr = local_intrs[i];
Expand All @@ -407,7 +407,7 @@ static void gic_all_vpes_irq_cpu_online(void)
write_gic_vl_smask(BIT(intr));
}

spin_unlock_irqrestore(&gic_lock, flags);
raw_spin_unlock_irqrestore(&gic_lock, flags);
}

static struct irq_chip gic_all_vpes_local_irq_controller = {
Expand Down Expand Up @@ -437,11 +437,11 @@ static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq,

data = irq_get_irq_data(virq);

spin_lock_irqsave(&gic_lock, flags);
raw_spin_lock_irqsave(&gic_lock, flags);
write_gic_map_pin(intr, GIC_MAP_PIN_MAP_TO_PIN | gic_cpu_pin);
write_gic_map_vp(intr, BIT(mips_cm_vp_id(cpu)));
irq_data_update_effective_affinity(data, cpumask_of(cpu));
spin_unlock_irqrestore(&gic_lock, flags);
raw_spin_unlock_irqrestore(&gic_lock, flags);

return 0;
}
Expand Down Expand Up @@ -533,12 +533,12 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
if (!gic_local_irq_is_routable(intr))
return -EPERM;

spin_lock_irqsave(&gic_lock, flags);
raw_spin_lock_irqsave(&gic_lock, flags);
for_each_online_cpu(cpu) {
write_gic_vl_other(mips_cm_vp_id(cpu));
write_gic_vo_map(mips_gic_vx_map_reg(intr), map);
}
spin_unlock_irqrestore(&gic_lock, flags);
raw_spin_unlock_irqrestore(&gic_lock, flags);

return 0;
}
Expand Down

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