x86: Distangle ioapic and i8259

The proposed Moorestown support patches use an extra feature flag
mechanism to make the ioapic work w/o an i8259. There is a much
simpler solution.

Most i8259 specific functions are already called dependend on the irq
number less than NR_IRQS_LEGACY. Replacing that constant by a
read_mostly variable which can be set to 0 by the platform setup code
allows us to achieve the same without any special feature flags.

That trivial change allows us to proceed with MRST w/o doing a full
blown overhaul of the ioapic code which would delay MRST unduly.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 31 insertions, 12 deletions

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 2b8aeb89933..e1f89a1a07e 100644
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -143,6 +143,8 @@ extern int noioapicreroute;
 /* 1 if the timer IRQ uses the '8259A Virtual Wire' mode */
 extern int timer_through_8259;
 
+extern void io_apic_disable_legacy(void);
+
 /*
  * If we use the IO-APIC for IRQ routing, disable automatic
  * assignment of PCI IRQ's.
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 5f4687187ce..6c961290a5f 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -91,6 +91,11 @@ struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
 /* # of MP IRQ source entries */
 int mp_irq_entries;
 
+/* Number of legacy interrupts */
+static int nr_legacy_irqs __read_mostly = NR_IRQS_LEGACY;
+/* GSI interrupts */
+static int nr_irqs_gsi = NR_IRQS_LEGACY;
+
 #if defined (CONFIG_MCA) || defined (CONFIG_EISA)
 int mp_bus_id_to_type[MAX_MP_BUSSES];
 #endif
@@ -172,6 +177,12 @@ static struct irq_cfg irq_cfgx[NR_IRQS] = {
         [15] = { .vector = IRQ15_VECTOR, },
 };
 
+void __init io_apic_disable_legacy(void)
+{
+        nr_legacy_irqs = 0;
+        nr_irqs_gsi = 0;
+}
+
 int __init arch_early_irq_init(void)
 {
         struct irq_cfg *cfg;
@@ -189,7 +200,7 @@ int __init arch_early_irq_init(void)
                 desc->chip_data = &cfg[i];
                 zalloc_cpumask_var_node(&cfg[i].domain, GFP_NOWAIT, node);
                 zalloc_cpumask_var_node(&cfg[i].old_domain, GFP_NOWAIT, node);
-                if (i < NR_IRQS_LEGACY)
+                if (i < nr_legacy_irqs)
                         cpumask_setall(cfg[i].domain);
         }
 
@@ -883,7 +894,7 @@ static int __init find_isa_irq_apic(int irq, int type)
  */
 static int EISA_ELCR(unsigned int irq)
 {
-        if (irq < NR_IRQS_LEGACY) {
+        if (irq < nr_legacy_irqs) {
                 unsigned int port = 0x4d0 + (irq >> 3);
                 return (inb(port) >> (irq & 7)) & 1;
         }
@@ -1480,7 +1491,7 @@ static void setup_IO_APIC_irq(int apic_id, int pin, unsigned int irq, struct irq
         }
 
         ioapic_register_intr(irq, desc, trigger);
-        if (irq < NR_IRQS_LEGACY)
+        if (irq < nr_legacy_irqs)
                 disable_8259A_irq(irq);
 
         ioapic_write_entry(apic_id, pin, entry);
@@ -1851,7 +1862,7 @@ __apicdebuginit(void) print_PIC(void)
         unsigned int v;
         unsigned long flags;
 
-        if (apic_verbosity == APIC_QUIET)
+        if (apic_verbosity == APIC_QUIET || !nr_legacy_irqs)
                 return;
 
         printk(KERN_DEBUG "\nprinting PIC contents\n");
@@ -1914,6 +1925,10 @@ void __init enable_IO_APIC(void)
                 spin_unlock_irqrestore(&ioapic_lock, flags);
                 nr_ioapic_registers[apic] = reg_01.bits.entries+1;
         }
+
+        if (!nr_legacy_irqs)
+                return;
+
         for(apic = 0; apic < nr_ioapics; apic++) {
                 int pin;
                 /* See if any of the pins is in ExtINT mode */
@@ -1968,6 +1983,9 @@ void disable_IO_APIC(void)
          */
         clear_IO_APIC();
 
+        if (!nr_legacy_irqs)
+                return;
+
         /*
          * If the i8259 is routed through an IOAPIC
          * Put that IOAPIC in virtual wire mode
@@ -2198,7 +2216,7 @@ static unsigned int startup_ioapic_irq(unsigned int irq)
         struct irq_cfg *cfg;
 
         spin_lock_irqsave(&ioapic_lock, flags);
-        if (irq < NR_IRQS_LEGACY) {
+        if (irq < nr_legacy_irqs) {
                 disable_8259A_irq(irq);
                 if (i8259A_irq_pending(irq))
                         was_pending = 1;
@@ -2709,7 +2727,7 @@ static inline void init_IO_APIC_traps(void)
                          * so default to an old-fashioned 8259
                          * interrupt if we can..
                          */
-                        if (irq < NR_IRQS_LEGACY)
+                        if (irq < nr_legacy_irqs)
                                 make_8259A_irq(irq);
                         else
                                 /* Strange. Oh, well.. */
@@ -3045,7 +3063,7 @@ out:
  * the I/O APIC in all cases now.  No actual device should request
  * it anyway.  --macro
  */
-#define PIC_IRQS        (1 << PIC_CASCADE_IR)
+#define PIC_IRQS        (1UL << PIC_CASCADE_IR)
 
 void __init setup_IO_APIC(void)
 {
@@ -3053,8 +3071,7 @@ void __init setup_IO_APIC(void)
         /*
          * calling enable_IO_APIC() is moved to setup_local_APIC for BP
          */
-
-        io_apic_irqs = ~PIC_IRQS;
+        io_apic_irqs = nr_legacy_irqs ? ~PIC_IRQS : ~0UL;
 
         apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
         /*
@@ -3065,7 +3082,8 @@ void __init setup_IO_APIC(void)
         sync_Arb_IDs();
         setup_IO_APIC_irqs();
         init_IO_APIC_traps();
-        check_timer();
+        if (nr_legacy_irqs)
+                check_timer();
 }
 
 /*
@@ -3166,7 +3184,6 @@ static int __init ioapic_init_sysfs(void)
 
 device_initcall(ioapic_init_sysfs);
 
-static int nr_irqs_gsi = NR_IRQS_LEGACY;
 /*
  * Dynamic irq allocate and deallocation
  */
@@ -3907,7 +3924,7 @@ static int __io_apic_set_pci_routing(struct device *dev, int irq,
         /*
          * IRQs < 16 are already in the irq_2_pin[] map
          */
-        if (irq >= NR_IRQS_LEGACY) {
+        if (irq >= nr_legacy_irqs) {
                 cfg = desc->chip_data;
                 add_pin_to_irq_node(cfg, node, ioapic, pin);
         }