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Subject[irqchip: irq/irqchip-next] irqchip/mips-gic: Get rid of the reliance on irq_cpu_online()
The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID: dd098a0e031928cf88c89f7577d31821e1f0e6de
Gitweb: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/dd098a0e031928cf88c89f7577d31821e1f0e6de
Author: Marc Zyngier <maz@kernel.org>
AuthorDate: Thu, 21 Oct 2021 18:04:13 +01:00
Committer: Marc Zyngier <maz@kernel.org>
CommitterDate: Tue, 26 Oct 2021 11:19:38 +01:00

irqchip/mips-gic: Get rid of the reliance on irq_cpu_online()

The MIPS GIC driver uses irq_cpu_online() to go and program the
per-CPU interrupts. However, this method iterates over all IRQs
in the system, despite only 3 per-CPU interrupts being of interest.

Let's be terribly bold and do the iteration ourselves. To ensure
mutual exclusion, hold the gic_lock spinlock that is otherwise
taken while dealing with these interrupts.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Serge Semin <fancer.lancer@gmail.com>
Link: https://lore.kernel.org/r/20211021170414.3341522-3-maz@kernel.org
---
drivers/irqchip/irq-mips-gic.c | 37 +++++++++++++++++++++++----------
1 file changed, 26 insertions(+), 11 deletions(-)

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index 54c7092..d02b05a 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -381,24 +381,35 @@ static void gic_unmask_local_irq_all_vpes(struct irq_data *d)
spin_unlock_irqrestore(&gic_lock, flags);
}

-static void gic_all_vpes_irq_cpu_online(struct irq_data *d)
+static void gic_all_vpes_irq_cpu_online(void)
{
- struct gic_all_vpes_chip_data *cd;
- unsigned int intr;
+ static const unsigned int local_intrs[] = {
+ GIC_LOCAL_INT_TIMER,
+ GIC_LOCAL_INT_PERFCTR,
+ GIC_LOCAL_INT_FDC,
+ };
+ unsigned long flags;
+ int i;

- intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
- cd = irq_data_get_irq_chip_data(d);
+ spin_lock_irqsave(&gic_lock, flags);

- write_gic_vl_map(mips_gic_vx_map_reg(intr), cd->map);
- if (cd->mask)
- write_gic_vl_smask(BIT(intr));
+ for (i = 0; i < ARRAY_SIZE(local_intrs); i++) {
+ unsigned int intr = local_intrs[i];
+ struct gic_all_vpes_chip_data *cd;
+
+ cd = &gic_all_vpes_chip_data[intr];
+ write_gic_vl_map(mips_gic_vx_map_reg(intr), cd->map);
+ if (cd->mask)
+ write_gic_vl_smask(BIT(intr));
+ }
+
+ spin_unlock_irqrestore(&gic_lock, flags);
}

static struct irq_chip gic_all_vpes_local_irq_controller = {
.name = "MIPS GIC Local",
.irq_mask = gic_mask_local_irq_all_vpes,
.irq_unmask = gic_unmask_local_irq_all_vpes,
- .irq_cpu_online = gic_all_vpes_irq_cpu_online,
};

static void __gic_irq_dispatch(void)
@@ -477,6 +488,10 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
intr = GIC_HWIRQ_TO_LOCAL(hwirq);
map = GIC_MAP_PIN_MAP_TO_PIN | gic_cpu_pin;

+ /*
+ * If adding support for more per-cpu interrupts, keep the the
+ * array in gic_all_vpes_irq_cpu_online() in sync.
+ */
switch (intr) {
case GIC_LOCAL_INT_TIMER:
/* CONFIG_MIPS_CMP workaround (see __gic_init) */
@@ -663,8 +678,8 @@ static int gic_cpu_startup(unsigned int cpu)
/* Clear all local IRQ masks (ie. disable all local interrupts) */
write_gic_vl_rmask(~0);

- /* Invoke irq_cpu_online callbacks to enable desired interrupts */
- irq_cpu_online();
+ /* Enable desired interrupts */
+ gic_all_vpes_irq_cpu_online();

return 0;
}
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