x86/ioapic: Use irq_find_matching_fwspec() to find remapping irqdomain

All possible parent domains have a select method now. Make use of it.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201024213535.443185-29-dwmw2@infradead.org

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index ea983da..443d2c9 100644 (file)
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2320,36 +2320,37 @@ out:
 
 static int mp_irqdomain_create(int ioapic)
 {
-       struct irq_alloc_info info;
        struct irq_domain *parent;
        int hwirqs = mp_ioapic_pin_count(ioapic);
        struct ioapic *ip = &ioapics[ioapic];
        struct ioapic_domain_cfg *cfg = &ip->irqdomain_cfg;
        struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);
        struct fwnode_handle *fn;
-       char *name = "IO-APIC";
+       struct irq_fwspec fwspec;
 
        if (cfg->type == IOAPIC_DOMAIN_INVALID)
                return 0;
 
-       init_irq_alloc_info(&info, NULL);
-       info.type = X86_IRQ_ALLOC_TYPE_IOAPIC_GET_PARENT;
-       info.devid = mpc_ioapic_id(ioapic);
-       parent = irq_remapping_get_irq_domain(&info);
-       if (!parent)
-               parent = x86_vector_domain;
-       else
-               name = "IO-APIC-IR";
-
        /* Handle device tree enumerated APICs proper */
        if (cfg->dev) {
                fn = of_node_to_fwnode(cfg->dev);
        } else {
-               fn = irq_domain_alloc_named_id_fwnode(name, ioapic);
+               fn = irq_domain_alloc_named_id_fwnode("IO-APIC", ioapic);
                if (!fn)
                        return -ENOMEM;
        }
 
+       fwspec.fwnode = fn;
+       fwspec.param_count = 1;
+       fwspec.param[0] = ioapic;
+
+       parent = irq_find_matching_fwspec(&fwspec, DOMAIN_BUS_ANY);
+       if (!parent) {
+               if (!cfg->dev)
+                       irq_domain_free_fwnode(fn);
+               return -ENODEV;
+       }
+
        ip->irqdomain = irq_domain_create_linear(fn, hwirqs, cfg->ops,
                                                 (void *)(long)ioapic);