On Thu, Jul 03, 2025 at 12:25:08PM +0200, Lorenzo Pieralisi wrote: > From: Marc Zyngier <maz@xxxxxxxxxx> > > The arm64 arch has relied so far on GIC architectural software > generated interrupt (SGIs) to handle IPIs. Those are per-cpu > software generated interrupts. > > arm64 architecture code that allocates the IPIs virtual IRQs and > IRQ descriptors was written accordingly. > > On GICv5 systems, IPIs are implemented using LPIs that are not > per-cpu interrupts - they are just normal routable IRQs. > > Add arch code to set-up IPIs on systems where they are handled > using normal routable IRQs. > > For those systems, force the IRQ affinity (and make it immutable) > to the cpu a given IRQ was assigned to. > > Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> > [timothy.hayes@xxxxxxx: fixed ipi/irq conversion, irq flags] > Signed-off-by: Timothy Hayes <timothy.hayes@xxxxxxx> > [lpieralisi: changed affinity set-up, log] > Signed-off-by: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx> > Cc: Will Deacon <will@xxxxxxxxxx> > Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
