irqchip/gic-v2, v3: Prevent SW resends entirely

The GIC irqchips can now use a HW resend when a retrigger is invoked by
check_irq_resend(). However, should the HW resend fail, check_irq_resend()
will still attempt to trigger a SW resend, which is still a bad idea for
the GICs.

Prevent this from happening by setting IRQD_HANDLE_ENFORCE_IRQCTX on all
GIC IRQs. Technically per-cpu IRQs do not need this, as their flow handlers
never set IRQS_PENDING, but this aligns all IRQs wrt context enforcement:
this also forces all GIC IRQ handling to happen in IRQ context (as defined
by in_irq()).

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200730170321.31228-3-valentin.schneider@arm.com

diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index b507bc7..4e9387a 100644 (file)
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1279,6 +1279,7 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
                              irq_hw_number_t hw)
 {
        struct irq_chip *chip = &gic_chip;
+       struct irq_data *irqd = irq_desc_get_irq_data(irq_to_desc(irq));
 
        if (static_branch_likely(&supports_deactivate_key))
                chip = &gic_eoimode1_chip;
@@ -1296,7 +1297,7 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
                irq_domain_set_info(d, irq, hw, chip, d->host_data,
                                    handle_fasteoi_irq, NULL, NULL);
                irq_set_probe(irq);
-               irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
+               irqd_set_single_target(irqd);
                break;
 
        case LPI_RANGE:
@@ -1310,6 +1311,8 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
                return -EPERM;
        }
 
+       /* Prevents SW retriggers which mess up the ACK/EOI ordering */
+       irqd_set_handle_enforce_irqctx(irqd);
        return 0;
 }
 

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index e92ee2b..b59bcef 100644 (file)
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -975,6 +975,7 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
                                irq_hw_number_t hw)
 {
        struct gic_chip_data *gic = d->host_data;
+       struct irq_data *irqd = irq_desc_get_irq_data(irq_to_desc(irq));
 
        if (hw < 32) {
                irq_set_percpu_devid(irq);
@@ -984,8 +985,11 @@ static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
                irq_domain_set_info(d, irq, hw, &gic->chip, d->host_data,
                                    handle_fasteoi_irq, NULL, NULL);
                irq_set_probe(irq);
-               irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(irq)));
+               irqd_set_single_target(irqd);
        }
+
+       /* Prevents SW retriggers which mess up the ACK/EOI ordering */
+       irqd_set_handle_enforce_irqctx(irqd);
        return 0;
 }