x86, ioapic: Split up setup_ioapic_entry()

Ingo pointed out that setup_ioapic_entry() is way too big now.

Split the intr-remap code out into setup_ir_ioapic_entry().

Also pass struct io_apic_irq_attr * instead of 5 parameters
in those two functions.

At last in setup_ir_ioapic_entry() we don't need to panic.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/4E9542BB.4070807@oracle.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/apic/io_apic.c

@@ -1255,72 +1255,95 @@ static void ioapic_register_intr(unsigned int irq, struct irq_cfg *cfg,
 				      fasteoi ? "fasteoi" : "edge");
 }
 
-static int setup_ioapic_entry(int apic_id, int irq,
-			      struct IO_APIC_route_entry *entry,
-			      unsigned int destination, int trigger,
-			      int polarity, int vector, int pin)
+
+static int setup_ir_ioapic_entry(int irq,
+			      struct IR_IO_APIC_route_entry *entry,
+			      unsigned int destination, int vector,
+			      struct io_apic_irq_attr *attr)
 {
-	/*
-	 * add it to the IO-APIC irq-routing table:
-	 */
-	memset(entry,0,sizeof(*entry));
+	int index;
+	struct irte irte;
+	int apic_id = mpc_ioapic_id(attr->ioapic);
+	struct intel_iommu *iommu = map_ioapic_to_ir(apic_id);
 
-	if (intr_remapping_enabled) {
-		struct intel_iommu *iommu = map_ioapic_to_ir(apic_id);
-		struct irte irte;
-		struct IR_IO_APIC_route_entry *ir_entry =
-			(struct IR_IO_APIC_route_entry *) entry;
-		int index;
+	if (!iommu) {
+		pr_warn("No mapping iommu for ioapic %d\n", apic_id);
+		return -ENODEV;
+	}
 
-		if (!iommu)
-			panic("No mapping iommu for ioapic %d\n", apic_id);
+	index = alloc_irte(iommu, irq, 1);
+	if (index < 0) {
+		pr_warn("Failed to allocate IRTE for ioapic %d\n", apic_id);
+		return -ENOMEM;
+	}
 
-		index = alloc_irte(iommu, irq, 1);
-		if (index < 0)
-			panic("Failed to allocate IRTE for ioapic %d\n", apic_id);
+	prepare_irte(&irte, vector, destination);
 
-		prepare_irte(&irte, vector, destination);
+	/* Set source-id of interrupt request */
+	set_ioapic_sid(&irte, apic_id);
 
-		/* Set source-id of interrupt request */
-		set_ioapic_sid(&irte, apic_id);
+	modify_irte(irq, &irte);
 
-		modify_irte(irq, &irte);
+	apic_printk(APIC_VERBOSE, KERN_DEBUG "IOAPIC[%d]: "
+		"Set IRTE entry (P:%d FPD:%d Dst_Mode:%d "
+		"Redir_hint:%d Trig_Mode:%d Dlvry_Mode:%X "
+		"Avail:%X Vector:%02X Dest:%08X "
+		"SID:%04X SQ:%X SVT:%X)\n",
+		apic_id, irte.present, irte.fpd, irte.dst_mode,
+		irte.redir_hint, irte.trigger_mode, irte.dlvry_mode,
+		irte.avail, irte.vector, irte.dest_id,
+		irte.sid, irte.sq, irte.svt);
+
+	memset(entry, 0, sizeof(*entry));
+
+	entry->index2	= (index >> 15) & 0x1;
+	entry->zero	= 0;
+	entry->format	= 1;
+	entry->index	= (index & 0x7fff);
+	/*
+	 * IO-APIC RTE will be configured with virtual vector.
+	 * irq handler will do the explicit EOI to the io-apic.
+	 */
+	entry->vector	= attr->ioapic_pin;
+	entry->mask	= 0;			/* enable IRQ */
+	entry->trigger	= attr->trigger;
+	entry->polarity	= attr->polarity;
 
-		ir_entry->index2 = (index >> 15) & 0x1;
-		ir_entry->zero = 0;
-		ir_entry->format = 1;
-		ir_entry->index = (index & 0x7fff);
-		/*
-		 * IO-APIC RTE will be configured with virtual vector.
-		 * irq handler will do the explicit EOI to the io-apic.
-		 */
-		ir_entry->vector = pin;
-
-		apic_printk(APIC_VERBOSE, KERN_DEBUG "IOAPIC[%d]: "
-			"Set IRTE entry (P:%d FPD:%d Dst_Mode:%d "
-			"Redir_hint:%d Trig_Mode:%d Dlvry_Mode:%X "
-			"Avail:%X Vector:%02X Dest:%08X "
-			"SID:%04X SQ:%X SVT:%X)\n",
-			apic_id, irte.present, irte.fpd, irte.dst_mode,
-			irte.redir_hint, irte.trigger_mode, irte.dlvry_mode,
-			irte.avail, irte.vector, irte.dest_id,
-			irte.sid, irte.sq, irte.svt);
-	} else {
-		entry->delivery_mode = apic->irq_delivery_mode;
-		entry->dest_mode = apic->irq_dest_mode;
-		entry->dest = destination;
-		entry->vector = vector;
-	}
+	/* Mask level triggered irqs.
+	 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
+	 */
+	if (attr->trigger)
+		entry->mask = 1;
 
-	entry->mask = 0;				/* enable IRQ */
-	entry->trigger = trigger;
-	entry->polarity = polarity;
+	return 0;
+}
 
-	/* Mask level triggered irqs.
+static int setup_ioapic_entry(int irq, struct IO_APIC_route_entry *entry,
+			       unsigned int destination, int vector,
+			       struct io_apic_irq_attr *attr)
+{
+	if (intr_remapping_enabled)
+		return setup_ir_ioapic_entry(irq,
+			 (struct IR_IO_APIC_route_entry *)entry,
+			 destination, vector, attr);
+
+	memset(entry, 0, sizeof(*entry));
+
+	entry->delivery_mode = apic->irq_delivery_mode;
+	entry->dest_mode     = apic->irq_dest_mode;
+	entry->dest	     = destination;
+	entry->vector	     = vector;
+	entry->mask	     = 0;			/* enable IRQ */
+	entry->trigger	     = attr->trigger;
+	entry->polarity	     = attr->polarity;
+
+	/*
+	 * Mask level triggered irqs.
 	 * Use IRQ_DELAYED_DISABLE for edge triggered irqs.
 	 */
-	if (trigger)
+	if (attr->trigger)
 		entry->mask = 1;
+
 	return 0;
 }
 
@@ -1351,13 +1374,11 @@ static void setup_ioapic_irq(unsigned int irq, struct irq_cfg *cfg,
 		    attr->ioapic, mpc_ioapic_id(attr->ioapic), attr->ioapic_pin,
 		    cfg->vector, irq, attr->trigger, attr->polarity, dest);
 
-
-	if (setup_ioapic_entry(mpc_ioapic_id(attr->ioapic), irq, &entry,
-			       dest, attr->trigger, attr->polarity, cfg->vector,
-			       attr->ioapic_pin)) {
-		printk("Failed to setup ioapic entry for ioapic  %d, pin %d\n",
-		       mpc_ioapic_id(attr->ioapic), attr->ioapic_pin);
+	if (setup_ioapic_entry(irq, &entry, dest, cfg->vector, attr)) {
+		pr_warn("Failed to setup ioapic entry for ioapic  %d, pin %d\n",
+			mpc_ioapic_id(attr->ioapic), attr->ioapic_pin);
 		__clear_irq_vector(irq, cfg);
+
 		return;
 	}