genirq: Provide IRQCHIP_AFFINITY_PRE_STARTUP

X86 IO/APIC and MSI interrupts (when used without interrupts remapping)
require that the affinity setup on startup is done before the interrupt is
enabled for the first time as the non-remapped operation mode cannot safely
migrate enabled interrupts from arbitrary contexts. Provide a new irq chip
flag which allows affected hardware to request this.

This has to be opt-in because there have been reports in the past that some
interrupt chips cannot handle affinity setting before startup.

Fixes: 18404756765c ("genirq: Expose default irq affinity mask (take 3)")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210729222542.779791738@linutronix.de

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 8e9a9ae..c8293c8 100644 (file)
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -569,6 +569,7 @@ struct irq_chip {
  * IRQCHIP_SUPPORTS_NMI:              Chip can deliver NMIs, only for root irqchips
  * IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND:  Invokes __enable_irq()/__disable_irq() for wake irqs
  *                                    in the suspend path if they are in disabled state
+ * IRQCHIP_AFFINITY_PRE_STARTUP:      Default affinity update before startup
  */
 enum {
        IRQCHIP_SET_TYPE_MASKED                 = (1 <<  0),
@@ -581,6 +582,7 @@ enum {
        IRQCHIP_SUPPORTS_LEVEL_MSI              = (1 <<  7),
        IRQCHIP_SUPPORTS_NMI                    = (1 <<  8),
        IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND        = (1 <<  9),
+       IRQCHIP_AFFINITY_PRE_STARTUP            = (1 << 10),
 };
 
 #include <linux/irqdesc.h>

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 7f04c7d..a98bcfc 100644 (file)
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -265,8 +265,11 @@ int irq_startup(struct irq_desc *desc, bool resend, bool force)
        } else {
                switch (__irq_startup_managed(desc, aff, force)) {
                case IRQ_STARTUP_NORMAL:
+                       if (d->chip->flags & IRQCHIP_AFFINITY_PRE_STARTUP)
+                               irq_setup_affinity(desc);
                        ret = __irq_startup(desc);
-                       irq_setup_affinity(desc);
+                       if (!(d->chip->flags & IRQCHIP_AFFINITY_PRE_STARTUP))
+                               irq_setup_affinity(desc);
                        break;
                case IRQ_STARTUP_MANAGED:
                        irq_do_set_affinity(d, aff, false);