x86, devicetree, irq: Use common mechanism to support irqdomain

Now the ioapic driver provides a common interface to create irqdomain,
so replace the private implementation.

Signed-off-by: Jiang Liu <[e-mail]>
Cc: Konrad Rzeszutek Wilk <[e-mail]>
Cc: Tony Luck <[e-mail]>
Cc: Joerg Roedel <[e-mail]>
Cc: Paul Gortmaker <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Cc: Benjamin Herrenschmidt <[e-mail]>
Cc: Grant Likely <[e-mail]>
Cc: Rafael J. Wysocki <[e-mail]>
Cc: Bjorn Helgaas <[e-mail]>
Cc: Randy Dunlap <[e-mail]>
Cc: Yinghai Lu <[e-mail]>
Cc: Rob Herring <[e-mail]>
Cc: Michal Simek <[e-mail]>
Cc: Tony Lindgren <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Thomas Gleixner <[e-mail]>

arch/x86/include/asm/prom.h

···
 extern int of_ioapic;
 extern u64 initial_dtb;
 extern void add_dtb(u64 data);
-extern void x86_add_irq_domains(void);
 void x86_of_pci_init(void);
 void x86_dtb_init(void);
 #else
 static inline void add_dtb(u64 data) { }
-static inline void x86_add_irq_domains(void) { }
 static inline void x86_of_pci_init(void) { }
 static inline void x86_dtb_init(void) { }
 #define of_ioapic 0

arch/x86/kernel/devicetree.c

···
 #ifdef CONFIG_X86_IO_APIC
 static unsigned int ioapic_id;
 
+struct of_ioapic_type {
+	u32 out_type;
+	u32 trigger;
+	u32 polarity;
+};
+
+static struct of_ioapic_type of_ioapic_type[] =
+{
+	{
+		.out_type	= IRQ_TYPE_EDGE_RISING,
+		.trigger	= IOAPIC_EDGE,
+		.polarity	= 1,
+	},
+	{
+		.out_type	= IRQ_TYPE_LEVEL_LOW,
+		.trigger	= IOAPIC_LEVEL,
+		.polarity	= 0,
+	},
+	{
+		.out_type	= IRQ_TYPE_LEVEL_HIGH,
+		.trigger	= IOAPIC_LEVEL,
+		.polarity	= 1,
+	},
+	{
+		.out_type	= IRQ_TYPE_EDGE_FALLING,
+		.trigger	= IOAPIC_EDGE,
+		.polarity	= 0,
+	},
+};
+
+static int ioapic_xlate(struct irq_domain *domain,
+			struct device_node *controller,
+			const u32 *intspec, u32 intsize,
+			irq_hw_number_t *out_hwirq, u32 *out_type)
+{
+	struct io_apic_irq_attr attr;
+	struct of_ioapic_type *it;
+	u32 line, idx;
+	int rc;
+
+	if (WARN_ON(intsize < 2))
+		return -EINVAL;
+
+	line = intspec[0];
+
+	if (intspec[1] >= ARRAY_SIZE(of_ioapic_type))
+		return -EINVAL;
+
+	it = &of_ioapic_type[intspec[1]];
+
+	idx = (u32)(long)domain->host_data;
+	set_io_apic_irq_attr(&attr, idx, line, it->trigger, it->polarity);
+
+	rc = io_apic_setup_irq_pin_once(irq_find_mapping(domain, line),
+					cpu_to_node(0), &attr);
+	if (rc)
+		return rc;
+
+	*out_hwirq = line;
+	*out_type = it->out_type;
+	return 0;
+}
+
+const struct irq_domain_ops ioapic_irq_domain_ops = {
+	.xlate = ioapic_xlate,
+};
+
 static void __init dtb_add_ioapic(struct device_node *dn)
 {
 	struct resource r;
 	int ret;
+	struct ioapic_domain_cfg cfg = {
+		.type = IOAPIC_DOMAIN_DYNAMIC,
+		.ops = &ioapic_irq_domain_ops,
+		.dev = dn,
+	};
 
 	ret = of_address_to_resource(dn, 0, &r);
 	if (ret) {
···
 				dn->full_name);
 		return;
 	}
-	mp_register_ioapic(++ioapic_id, r.start, gsi_top, NULL);
+	mp_register_ioapic(++ioapic_id, r.start, gsi_top, &cfg);
 }
 
 static void __init dtb_ioapic_setup(void)
···
 	dtb_setup_hpet();
 	dtb_apic_setup();
 }
-
-#ifdef CONFIG_X86_IO_APIC
-
-struct of_ioapic_type {
-	u32 out_type;
-	u32 trigger;
-	u32 polarity;
-};
-
-static struct of_ioapic_type of_ioapic_type[] =
-{
-	{
-		.out_type	= IRQ_TYPE_EDGE_RISING,
-		.trigger	= IOAPIC_EDGE,
-		.polarity	= 1,
-	},
-	{
-		.out_type	= IRQ_TYPE_LEVEL_LOW,
-		.trigger	= IOAPIC_LEVEL,
-		.polarity	= 0,
-	},
-	{
-		.out_type	= IRQ_TYPE_LEVEL_HIGH,
-		.trigger	= IOAPIC_LEVEL,
-		.polarity	= 1,
-	},
-	{
-		.out_type	= IRQ_TYPE_EDGE_FALLING,
-		.trigger	= IOAPIC_EDGE,
-		.polarity	= 0,
-	},
-};
-
-static int ioapic_xlate(struct irq_domain *domain,
-			struct device_node *controller,
-			const u32 *intspec, u32 intsize,
-			irq_hw_number_t *out_hwirq, u32 *out_type)
-{
-	struct io_apic_irq_attr attr;
-	struct of_ioapic_type *it;
-	u32 line, idx;
-	int rc;
-
-	if (WARN_ON(intsize < 2))
-		return -EINVAL;
-
-	line = intspec[0];
-
-	if (intspec[1] >= ARRAY_SIZE(of_ioapic_type))
-		return -EINVAL;
-
-	it = &of_ioapic_type[intspec[1]];
-
-	idx = (u32) domain->host_data;
-	set_io_apic_irq_attr(&attr, idx, line, it->trigger, it->polarity);
-
-	rc = io_apic_setup_irq_pin_once(irq_find_mapping(domain, line),
-					cpu_to_node(0), &attr);
-	if (rc)
-		return rc;
-
-	*out_hwirq = line;
-	*out_type = it->out_type;
-	return 0;
-}
-
-const struct irq_domain_ops ioapic_irq_domain_ops = {
-	.xlate = ioapic_xlate,
-};
-
-static void dt_add_ioapic_domain(unsigned int ioapic_num,
-		struct device_node *np)
-{
-	struct irq_domain *id;
-	struct mp_ioapic_gsi *gsi_cfg;
-	int ret;
-	int num, legacy_irqs = nr_legacy_irqs();
-
-	gsi_cfg = mp_ioapic_gsi_routing(ioapic_num);
-	num = gsi_cfg->gsi_end - gsi_cfg->gsi_base + 1;
-
-	id = irq_domain_add_linear(np, num, &ioapic_irq_domain_ops,
-			(void *)ioapic_num);
-	BUG_ON(!id);
-	if (gsi_cfg->gsi_base == 0) {
-		/*
-		 * The first nr_legacy_irqs() irq descs are allocated in
-		 * early_irq_init() and need just a mapping. The
-		 * remaining irqs need both. All of them are preallocated
-		 * and assigned so we can keep the 1:1 mapping which the ioapic
-		 * is having.
-		 */
-		irq_domain_associate_many(id, 0, 0, legacy_irqs);
-
-		if (num > legacy_irqs) {
-			ret = irq_create_strict_mappings(id, legacy_irqs,
-					legacy_irqs, num - legacy_irqs);
-			if (ret)
-				pr_err("Error creating mapping for the "
-						"remaining IRQs: %d\n", ret);
-		}
-		irq_set_default_host(id);
-	} else {
-		ret = irq_create_strict_mappings(id, gsi_cfg->gsi_base, 0, num);
-		if (ret)
-			pr_err("Error creating IRQ mapping: %d\n", ret);
-	}
-}
-
-static void __init ioapic_add_ofnode(struct device_node *np)
-{
-	struct resource r;
-	int i, ret;
-
-	ret = of_address_to_resource(np, 0, &r);
-	if (ret) {
-		printk(KERN_ERR "Failed to obtain address for %s\n",
-				np->full_name);
-		return;
-	}
-
-	for (i = 0; i < nr_ioapics; i++) {
-		if (r.start == mpc_ioapic_addr(i)) {
-			dt_add_ioapic_domain(i, np);
-			return;
-		}
-	}
-	printk(KERN_ERR "IOxAPIC at %s is not registered.\n", np->full_name);
-}
-
-void __init x86_add_irq_domains(void)
-{
-	struct device_node *dp;
-
-	if (!of_have_populated_dt())
-		return;
-
-	for_each_node_with_property(dp, "interrupt-controller") {
-		if (of_device_is_compatible(dp, "intel,ce4100-ioapic"))
-			ioapic_add_ofnode(dp);
-	}
-}
-#else
-void __init x86_add_irq_domains(void) { }
-#endif

arch/x86/kernel/irqinit.c

···
 	int i;
 
 	/*
-	 * We probably need a better place for this, but it works for
-	 * now ...
-	 */
-	x86_add_irq_domains();
-
-	/*
 	 * On cpu 0, Assign IRQ0_VECTOR..IRQ15_VECTOR's to IRQ 0..15.
 	 * If these IRQ's are handled by legacy interrupt-controllers like PIC,
 	 * then this configuration will likely be static after the boot. If