x86, irq: Move IRQ initialization routines from io_apic.c into vector.c

Move IRQ initialization routines from io_apic.c into vector.c,
preparing for enabling hierarchy irqdomain.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Prarit Bhargava <prarit@redhat.com>
Link: http://lkml.kernel.org/r/1414397531-28254-15-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

3 files changed, 31 insertions, 21 deletions

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index b7f1499d177f..bf006cce9418 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -145,6 +145,7 @@ extern unsigned long io_apic_irqs;
 
 struct irq_cfg;
 extern void ioapic_insert_resources(void);
+extern int arch_early_ioapic_init(void);
 
 extern int native_setup_ioapic_entry(int, struct IO_APIC_route_entry *,
                                      unsigned int, int,
@@ -248,6 +249,7 @@ extern void print_IO_APICs(void);
 #define io_apic_assign_pci_irqs 0
 #define setup_ioapic_ids_from_mpc x86_init_noop
 static inline void ioapic_insert_resources(void) { }
+static inline int arch_early_ioapic_init(void) { return 0; }
 static inline void print_IO_APICs(void) {}
 #define gsi_top (NR_IRQS_LEGACY)
 static inline int mp_find_ioapic(u32 gsi) { return 0; }
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 8dcdb7b1e848..2619cbe88d9f 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -245,7 +245,7 @@ static void free_ioapic_saved_registers(int idx)
         ioapics[idx].saved_registers = NULL;
 }
 
-int __init arch_early_irq_init(void)
+int __init arch_early_ioapic_init(void)
 {
         struct irq_cfg *cfg;
         int i, node = cpu_to_node(0);
@@ -2487,26 +2487,6 @@ unsigned int arch_dynirq_lower_bound(unsigned int from)
         return ioapic_initialized ? ioapic_dynirq_base : gsi_top;
 }
 
-int __init arch_probe_nr_irqs(void)
-{
-        int nr;
-
-        if (nr_irqs > (NR_VECTORS * nr_cpu_ids))
-                nr_irqs = NR_VECTORS * nr_cpu_ids;
-
-        nr = (gsi_top + nr_legacy_irqs()) + 8 * nr_cpu_ids;
-#if defined(CONFIG_PCI_MSI) || defined(CONFIG_HT_IRQ)
-        /*
-         * for MSI and HT dyn irq
-         */
-        nr += gsi_top * 16;
-#endif
-        if (nr < nr_irqs)
-                nr_irqs = nr;
-
-        return 0;
-}
-
 #ifdef CONFIG_X86_32
 static int io_apic_get_unique_id(int ioapic, int apic_id)
 {
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 938108fbc39b..19fcb57f86d5 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -235,6 +235,34 @@ void clear_irq_vector(int irq, struct irq_cfg *cfg)
         raw_spin_unlock_irqrestore(&vector_lock, flags);
 }
 
+int __init arch_probe_nr_irqs(void)
+{
+        int nr;
+
+        if (nr_irqs > (NR_VECTORS * nr_cpu_ids))
+                nr_irqs = NR_VECTORS * nr_cpu_ids;
+
+        nr = (gsi_top + nr_legacy_irqs()) + 8 * nr_cpu_ids;
+#if defined(CONFIG_PCI_MSI) || defined(CONFIG_HT_IRQ)
+        /*
+         * for MSI and HT dyn irq
+         */
+        if (gsi_top <= NR_IRQS_LEGACY)
+                nr +=  8 * nr_cpu_ids;
+        else
+                nr += gsi_top * 16;
+#endif
+        if (nr < nr_irqs)
+                nr_irqs = nr;
+
+        return nr_legacy_irqs();
+}
+
+int __init arch_early_irq_init(void)
+{
+        return arch_early_ioapic_init();
+}
+
 static void __setup_vector_irq(int cpu)
 {
         /* Initialize vector_irq on a new cpu */