Merge branch 'devel' into next

[pandora-kernel.git] / arch / x86 / kernel / io_apic_64.c

diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c
index f930885..6510cde 100644 (file)
--- a/arch/x86/kernel/io_apic_64.c
+++ b/arch/x86/kernel/io_apic_64.c
@@ -94,13 +94,6 @@ static int no_timer_check;
 
 static int disable_timer_pin_1 __initdata;
 
-static bool mask_ioapic_irq_2 __initdata;
-
-void __init force_mask_ioapic_irq_2(void)
-{
-       mask_ioapic_irq_2 = true;
-}
-
 int timer_through_8259 __initdata;
 
 /* Where if anywhere is the i8259 connect in external int mode */
@@ -373,6 +366,26 @@ static void add_pin_to_irq(unsigned int irq, int apic, int pin)
        entry->pin = pin;
 }
 
+/*
+ * Reroute an IRQ to a different pin.
+ */
+static void __init replace_pin_at_irq(unsigned int irq,
+                                     int oldapic, int oldpin,
+                                     int newapic, int newpin)
+{
+       struct irq_pin_list *entry = irq_2_pin + irq;
+
+       while (1) {
+               if (entry->apic == oldapic && entry->pin == oldpin) {
+                       entry->apic = newapic;
+                       entry->pin = newpin;
+               }
+               if (!entry->next)
+                       break;
+               entry = irq_2_pin + entry->next;
+       }
+}
+
 
 #define DO_ACTION(name,R,ACTION, FINAL)                                        \
                                                                        \
@@ -1147,7 +1160,7 @@ void __apicdebuginit print_local_APIC(void * dummy)
 
 void print_all_local_APICs (void)
 {
-       on_each_cpu(print_local_APIC, NULL, 1, 1);
+       on_each_cpu(print_local_APIC, NULL, 1);
 }
 
 void __apicdebuginit print_PIC(void)
@@ -1541,7 +1554,7 @@ static inline void init_IO_APIC_traps(void)
        }
 }
 
-static void enable_lapic_irq (unsigned int irq)
+static void unmask_lapic_irq(unsigned int irq)
 {
        unsigned long v;
 
@@ -1549,7 +1562,7 @@ static void enable_lapic_irq (unsigned int irq)
        apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
 }
 
-static void disable_lapic_irq (unsigned int irq)
+static void mask_lapic_irq(unsigned int irq)
 {
        unsigned long v;
 
@@ -1562,19 +1575,20 @@ static void ack_lapic_irq (unsigned int irq)
        ack_APIC_irq();
 }
 
-static void end_lapic_irq (unsigned int i) { /* nothing */ }
-
-static struct hw_interrupt_type lapic_irq_type __read_mostly = {
-       .name = "local-APIC",
-       .typename = "local-APIC-edge",
-       .startup = NULL, /* startup_irq() not used for IRQ0 */
-       .shutdown = NULL, /* shutdown_irq() not used for IRQ0 */
-       .enable = enable_lapic_irq,
-       .disable = disable_lapic_irq,
-       .ack = ack_lapic_irq,
-       .end = end_lapic_irq,
+static struct irq_chip lapic_chip __read_mostly = {
+       .name           = "local-APIC",
+       .mask           = mask_lapic_irq,
+       .unmask         = unmask_lapic_irq,
+       .ack            = ack_lapic_irq,
 };
 
+static void lapic_register_intr(int irq)
+{
+       irq_desc[irq].status &= ~IRQ_LEVEL;
+       set_irq_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
+                                     "edge");
+}
+
 static void __init setup_nmi(void)
 {
        /*
@@ -1685,9 +1699,6 @@ static inline void __init check_timer(void)
        apic_printk(APIC_VERBOSE,KERN_INFO "..TIMER: vector=0x%02X apic1=%d pin1=%d apic2=%d pin2=%d\n",
                cfg->vector, apic1, pin1, apic2, pin2);
 
-       if (mask_ioapic_irq_2)
-               mask_IO_APIC_irq(2);
-
        /*
         * Some BIOS writers are clueless and report the ExtINTA
         * I/O APIC input from the cascaded 8259A as the timer
@@ -1735,7 +1746,7 @@ static inline void __init check_timer(void)
                /*
                 * legacy devices should be connected to IO APIC #0
                 */
-               /* replace_pin_at_irq(0, apic1, pin1, apic2, pin2); */
+               replace_pin_at_irq(0, apic1, pin1, apic2, pin2);
                setup_timer_IRQ0_pin(apic2, pin2, cfg->vector);
                unmask_IO_APIC_irq(0);
                enable_8259A_irq(0);
@@ -1764,7 +1775,7 @@ static inline void __init check_timer(void)
 
        apic_printk(APIC_VERBOSE, KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
 
-       irq_desc[0].chip = &lapic_irq_type;
+       lapic_register_intr(0);
        apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector);     /* Fixed mode */
        enable_8259A_irq(0);
 
@@ -1802,11 +1813,21 @@ static int __init notimercheck(char *s)
 __setup("no_timer_check", notimercheck);
 
 /*
- *
- * IRQs that are handled by the PIC in the MPS IOAPIC case.
- * - IRQ2 is the cascade IRQ, and cannot be a io-apic IRQ.
- *   Linux doesn't really care, as it's not actually used
- *   for any interrupt handling anyway.
+ * Traditionally ISA IRQ2 is the cascade IRQ, and is not available
+ * to devices.  However there may be an I/O APIC pin available for
+ * this interrupt regardless.  The pin may be left unconnected, but
+ * typically it will be reused as an ExtINT cascade interrupt for
+ * the master 8259A.  In the MPS case such a pin will normally be
+ * reported as an ExtINT interrupt in the MP table.  With ACPI
+ * there is no provision for ExtINT interrupts, and in the absence
+ * of an override it would be treated as an ordinary ISA I/O APIC
+ * interrupt, that is edge-triggered and unmasked by default.  We
+ * used to do this, but it caused problems on some systems because
+ * of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
+ * the same ExtINT cascade interrupt to drive the local APIC of the
+ * bootstrap processor.  Therefore we refrain from routing IRQ2 to
+ * the I/O APIC in all cases now.  No actual device should request
+ * it anyway.  --macro
  */
 #define PIC_IRQS       (1<<2)
 
@@ -1817,10 +1838,7 @@ void __init setup_IO_APIC(void)
         * calling enable_IO_APIC() is moved to setup_local_APIC for BP
         */
 
-       if (acpi_ioapic)
-               io_apic_irqs = ~0;      /* all IRQs go through IOAPIC */
-       else
-               io_apic_irqs = ~PIC_IRQS;
+       io_apic_irqs = ~PIC_IRQS;
 
        apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");