x86, hpet: Introduce x86_msi_ops.setup_hpet_msi

This function pointer can be overwritten by the IRQ
remapping code. The irq_remapping_enabled check can be
removed from default_setup_hpet_msi.

Signed-off-by: Joerg Roedel <[e-mail]>
Acked-by: Sebastian Andrzej Siewior <[e-mail]>
Reviewed-by: Konrad Rzeszutek Wilk <[e-mail]>

arch/x86/include/asm/hpet.h

···
 extern void hpet_msi_read(struct hpet_dev *hdev, struct msi_msg *msg);
 
 #ifdef CONFIG_PCI_MSI
-extern int arch_setup_hpet_msi(unsigned int irq, unsigned int id);
+extern int default_setup_hpet_msi(unsigned int irq, unsigned int id);
 #else
-static inline int arch_setup_hpet_msi(unsigned int irq, unsigned int id)
+static inline int default_setup_hpet_msi(unsigned int irq, unsigned int id)
 {
 	return -EINVAL;
 }
···
 static inline int hpet_enable(void) { return 0; }
 static inline int is_hpet_enabled(void) { return 0; }
 #define hpet_readl(a) 0
+#define default_setup_hpet_msi	NULL
 
 #endif
 #endif /* _ASM_X86_HPET_H */

arch/x86/include/asm/x86_init.h

···
 	void (*teardown_msi_irq)(unsigned int irq);
 	void (*teardown_msi_irqs)(struct pci_dev *dev);
 	void (*restore_msi_irqs)(struct pci_dev *dev, int irq);
+	int  (*setup_hpet_msi)(unsigned int irq, unsigned int id);
 };
 
 struct x86_io_apic_ops {

arch/x86/kernel/apic/io_apic.c

···
 	.irq_retrigger = ioapic_retrigger_irq,
 };
 
-int arch_setup_hpet_msi(unsigned int irq, unsigned int id)
+int default_setup_hpet_msi(unsigned int irq, unsigned int id)
 {
 	struct irq_chip *chip = &hpet_msi_type;
 	struct msi_msg msg;
 	int ret;
-
-	if (irq_remapping_enabled) {
-		ret = setup_hpet_msi_remapped(irq, id);
-		if (ret)
-			return ret;
-	}
 
 	ret = msi_compose_msg(NULL, irq, &msg, id);
 	if (ret < 0)

arch/x86/kernel/hpet.c

···
 
 static int hpet_setup_msi_irq(unsigned int irq)
 {
-	if (arch_setup_hpet_msi(irq, hpet_blockid)) {
+	if (x86_msi.setup_hpet_msi(irq, hpet_blockid)) {
 		destroy_irq(irq);
 		return -EINVAL;
 	}

arch/x86/kernel/x86_init.c

···
 #include <asm/time.h>
 #include <asm/irq.h>
 #include <asm/io_apic.h>
+#include <asm/hpet.h>
 #include <asm/pat.h>
 #include <asm/tsc.h>
 #include <asm/iommu.h>
···
 
 EXPORT_SYMBOL_GPL(x86_platform);
 struct x86_msi_ops x86_msi = {
-	.setup_msi_irqs = native_setup_msi_irqs,
-	.teardown_msi_irq = native_teardown_msi_irq,
-	.teardown_msi_irqs = default_teardown_msi_irqs,
-	.restore_msi_irqs = default_restore_msi_irqs,
+	.setup_msi_irqs		= native_setup_msi_irqs,
+	.teardown_msi_irq	= native_teardown_msi_irq,
+	.teardown_msi_irqs	= default_teardown_msi_irqs,
+	.restore_msi_irqs	= default_restore_msi_irqs,
+	.setup_hpet_msi		= default_setup_hpet_msi,
 };
 
 struct x86_io_apic_ops x86_io_apic_ops = {

drivers/iommu/irq_remapping.c

···
 
 static void __init irq_remapping_modify_x86_ops(void)
 {
-	x86_io_apic_ops.disable	=	irq_remapping_disable_io_apic;
+	x86_io_apic_ops.disable		= irq_remapping_disable_io_apic;
+	x86_msi.setup_hpet_msi		= setup_hpet_msi_remapped;
 }
 
 static __init int setup_nointremap(char *str)