From: Andre Przywara andre.przywara@arm.com
commit 544808f7e21cb9ccdb8f3aa7de594c05b1419061 upstream.
At the moment the GIC IRQ domain translation routine happily converts ACPI table GSI numbers below 16 to GIC SGIs (Software Generated Interrupts aka IPIs). On the Devicetree side we explicitly forbid this translation, actually the function will never return HWIRQs below 16 when using a DT based domain translation.
We expect SGIs to be handled in the first part of the function, and any further occurrence should be treated as a firmware bug, so add a check and print to report this explicitly and avoid lengthy debug sessions.
Fixes: 64b499d8df40 ("irqchip/gic-v3: Configure SGIs as standard interrupts") Signed-off-by: Andre Przywara andre.przywara@arm.com Signed-off-by: Marc Zyngier maz@kernel.org Link: https://lore.kernel.org/r/20220404110842.2882446-1-andre.przywara@arm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/irqchip/irq-gic-v3.c | 6 ++++++ drivers/irqchip/irq-gic.c | 6 ++++++ 2 files changed, 12 insertions(+)
--- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -1467,6 +1467,12 @@ static int gic_irq_domain_translate(stru if(fwspec->param_count != 2) return -EINVAL;
+ if (fwspec->param[0] < 16) { + pr_err(FW_BUG "Illegal GSI%d translation request\n", + fwspec->param[0]); + return -EINVAL; + } + *hwirq = fwspec->param[0]; *type = fwspec->param[1];
--- a/drivers/irqchip/irq-gic.c +++ b/drivers/irqchip/irq-gic.c @@ -1094,6 +1094,12 @@ static int gic_irq_domain_translate(stru if(fwspec->param_count != 2) return -EINVAL;
+ if (fwspec->param[0] < 16) { + pr_err(FW_BUG "Illegal GSI%d translation request\n", + fwspec->param[0]); + return -EINVAL; + } + *hwirq = fwspec->param[0]; *type = fwspec->param[1];