Merge Christoph's freeze cleanup patch
[linux-2.6.git] / arch / i386 / kernel / io_apic.c
index 7a324e8..35eb8e2 100644 (file)
@@ -31,7 +31,7 @@
 #include <linux/mc146818rtc.h>
 #include <linux/compiler.h>
 #include <linux/acpi.h>
-
+#include <linux/module.h>
 #include <linux/sysdev.h>
 #include <asm/io.h>
 #include <asm/smp.h>
@@ -573,12 +573,14 @@ static int balanced_irq(void *unused)
        for ( ; ; ) {
                set_current_state(TASK_INTERRUPTIBLE);
                time_remaining = schedule_timeout(time_remaining);
-               try_to_freeze(PF_FREEZE);
+               try_to_freeze();
                if (time_after(jiffies,
                                prev_balance_time+balanced_irq_interval)) {
+                       preempt_disable();
                        do_irq_balance();
                        prev_balance_time = jiffies;
                        time_remaining = balanced_irq_interval;
+                       preempt_enable();
                }
        }
        return 0;
@@ -630,10 +632,8 @@ static int __init balanced_irq_init(void)
                printk(KERN_ERR "balanced_irq_init: failed to spawn balanced_irq");
 failed:
        for (i = 0; i < NR_CPUS; i++) {
-               if(irq_cpu_data[i].irq_delta)
-                       kfree(irq_cpu_data[i].irq_delta);
-               if(irq_cpu_data[i].last_irq)
-                       kfree(irq_cpu_data[i].last_irq);
+               kfree(irq_cpu_data[i].irq_delta);
+               kfree(irq_cpu_data[i].last_irq);
        }
        return 0;
 }
@@ -812,6 +812,7 @@ int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
        }
        return best_guess;
 }
+EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
 
 /*
  * This function currently is only a helper for the i386 smp boot process where 
@@ -1633,12 +1634,43 @@ static void __init enable_IO_APIC(void)
  */
 void disable_IO_APIC(void)
 {
+       int pin;
        /*
         * Clear the IO-APIC before rebooting:
         */
        clear_IO_APIC();
 
-       disconnect_bsp_APIC();
+       /*
+        * If the i82559 is routed through an IOAPIC
+        * Put that IOAPIC in virtual wire mode
+        * so legacy interrups can be delivered.
+        */
+       pin = find_isa_irq_pin(0, mp_ExtINT);
+       if (pin != -1) {
+               struct IO_APIC_route_entry entry;
+               unsigned long flags;
+
+               memset(&entry, 0, sizeof(entry));
+               entry.mask            = 0; /* Enabled */
+               entry.trigger         = 0; /* Edge */
+               entry.irr             = 0;
+               entry.polarity        = 0; /* High */
+               entry.delivery_status = 0;
+               entry.dest_mode       = 0; /* Physical */
+               entry.delivery_mode   = 7; /* ExtInt */
+               entry.vector          = 0;
+               entry.dest.physical.physical_dest = 0;
+
+
+               /*
+                * Add it to the IO-APIC irq-routing table:
+                */
+               spin_lock_irqsave(&ioapic_lock, flags);
+               io_apic_write(0, 0x11+2*pin, *(((int *)&entry)+1));
+               io_apic_write(0, 0x10+2*pin, *(((int *)&entry)+0));
+               spin_unlock_irqrestore(&ioapic_lock, flags);
+       }
+       disconnect_bsp_APIC(pin != -1);
 }
 
 /*
@@ -1659,6 +1691,12 @@ static void __init setup_ioapic_ids_from_mpc(void)
        unsigned long flags;
 
        /*
+        * Don't check I/O APIC IDs for xAPIC systems.  They have
+        * no meaning without the serial APIC bus.
+        */
+       if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && boot_cpu_data.x86 < 15))
+               return;
+       /*
         * This is broken; anything with a real cpu count has to
         * circumvent this idiocy regardless.
         */
@@ -1684,10 +1722,6 @@ static void __init setup_ioapic_ids_from_mpc(void)
                        mp_ioapics[apic].mpc_apicid = reg_00.bits.ID;
                }
 
-               /* Don't check I/O APIC IDs for some xAPIC systems.  They have
-                * no meaning without the serial APIC bus. */
-               if (NO_IOAPIC_CHECK)
-                       continue;
                /*
                 * Sanity check, is the ID really free? Every APIC in a
                 * system must have a unique ID or we get lots of nice