iommu/amd: Implement select() method on remapping irqdomain

Preparatory change to remove irq_remapping_get_irq_domain().

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201024213535.443185-25-dwmw2@infradead.org

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 9744cdbefd886c5d733b605827bab5f89c345770..31b22244e9c2f11bd3d8a64c3b72b28bec0fa5c5 100644 (file)
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -3882,7 +3882,26 @@ static void irq_remapping_deactivate(struct irq_domain *domain,
                                            irte_info->index);
 }
 
+static int irq_remapping_select(struct irq_domain *d, struct irq_fwspec *fwspec,
+                               enum irq_domain_bus_token bus_token)
+{
+       struct amd_iommu *iommu;
+       int devid = -1;
+
+       if (x86_fwspec_is_ioapic(fwspec))
+               devid = get_ioapic_devid(fwspec->param[0]);
+       else if (x86_fwspec_is_hpet(fwspec))
+               devid = get_hpet_devid(fwspec->param[0]);
+
+       if (devid < 0)
+               return 0;
+
+       iommu = amd_iommu_rlookup_table[devid];
+       return iommu && iommu->ir_domain == d;
+}
+
 static const struct irq_domain_ops amd_ir_domain_ops = {
+       .select = irq_remapping_select,
        .alloc = irq_remapping_alloc,
        .free = irq_remapping_free,
        .activate = irq_remapping_activate,