[PATCH] i386: move apic init in init_IRQs

All kinds of ugliness exists because we don't initialize
the apics during init_IRQs.
- We calibrate jiffies in non apic mode even when we are using apics.
- We have to have special code to initialize the apics when non-smp.
- The legacy i8259 must exist and be setup correctly, even
  when we won't use it past initialization.
- The kexec on panic code must restore the state of the io_apics.
- init/main.c needs a special case for !smp smp_init on x86

In addition to pure code movement I needed a couple
of non-obvious changes:
- Move setup_boot_APIC_clock into APIC_late_time_init for
  simplicity.
- Use cpu_khz to generate a better approximation of loops_per_jiffies
  so I can verify the timer interrupt is working.
- Call setup_apic_nmi_watchdog again after cpu_khz is initialized on
  the boot cpu.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 64 insertions, 17 deletions

diff --git a/arch/i386/kernel/apic.c b/arch/i386/kernel/apic.c
index 5546ddebec33..8d81b7bf7ad2 100644
--- a/arch/i386/kernel/apic.c
+++ b/arch/i386/kernel/apic.c
@@ -803,6 +803,7 @@ no_apic:
 
 void __init init_apic_mappings(void)
 {
+        unsigned int orig_apicid;
         unsigned long apic_phys;
 
         /*
@@ -824,8 +825,11 @@ void __init init_apic_mappings(void)
          * Fetch the APIC ID of the BSP in case we have a
          * default configuration (or the MP table is broken).
          */
-        if (boot_cpu_physical_apicid == -1U)
-                boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
+        orig_apicid = boot_cpu_physical_apicid;
+        boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
+        if ((orig_apicid != -1U) && (orig_apicid != boot_cpu_physical_apicid))
+                printk(KERN_WARNING "Boot APIC ID in local APIC unexpected (%d vs %d)",
+                        orig_apicid, boot_cpu_physical_apicid);
 
 #ifdef CONFIG_X86_IO_APIC
         {
@@ -1046,9 +1050,11 @@ static unsigned int calibration_result;
 
 void __init setup_boot_APIC_clock(void)
 {
+        unsigned long flags;
         apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n");
         using_apic_timer = 1;
 
+        local_irq_save(flags);
         local_irq_disable();
 
         calibration_result = calibrate_APIC_clock();
@@ -1057,7 +1063,7 @@ void __init setup_boot_APIC_clock(void)
          */
         setup_APIC_timer(calibration_result);
 
-        local_irq_enable();
+        local_irq_restore(flags);
 }
 
 void __devinit setup_secondary_APIC_clock(void)
@@ -1254,40 +1260,81 @@ fastcall void smp_error_interrupt(struct pt_regs *regs)
 }
 
 /*
- * This initializes the IO-APIC and APIC hardware if this is
- * a UP kernel.
+ * This initializes the IO-APIC and APIC hardware.
  */
-int __init APIC_init_uniprocessor (void)
+int __init APIC_init(void)
 {
-        if (enable_local_apic < 0)
-                clear_bit(X86_FEATURE_APIC, boot_cpu_data.x86_capability);
+        if (enable_local_apic < 0) {
+                printk(KERN_INFO "APIC disabled\n");
+                return -1;
+        }
 
-        if (!smp_found_config && !cpu_has_apic)
+        /* See if we have a SMP configuration or have forced enabled
+         * the local apic.
+         */
+        if (!smp_found_config && !acpi_lapic && !cpu_has_apic) {
+                enable_local_apic = -1;
                 return -1;
+        }
 
         /*
-         * Complain if the BIOS pretends there is one.
+         * Complain if the BIOS pretends there is an apic.
+         * Then get out because we don't have an a local apic.
          */
         if (!cpu_has_apic && APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
                 printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
                         boot_cpu_physical_apicid);
+                printk(KERN_ERR "... forcing use of dummy APIC emulation. (tell your hw vendor)\n");
+                enable_local_apic = -1;
                 return -1;
         }
 
         verify_local_APIC();
 
+        /*
+         * Should not be necessary because the MP table should list the boot
+         * CPU too, but we do it for the sake of robustness anyway.
+         * Makes no sense to do this check in clustered apic mode, so skip it
+         */
+        if (!check_phys_apicid_present(boot_cpu_physical_apicid)) {
+                printk("weird, boot CPU (#%d) not listed by the BIOS.\n",
+                                boot_cpu_physical_apicid);
+                physid_set(hard_smp_processor_id(), phys_cpu_present_map);
+        }
+
+        /*
+         * Switch from PIC to APIC mode.
+         */
         connect_bsp_APIC();
+        setup_local_APIC();
 
-        phys_cpu_present_map = physid_mask_of_physid(boot_cpu_physical_apicid);
+#ifdef CONFIG_X86_IO_APIC
+        /*
+         * Now start the IO-APICs
+         */
+        if (smp_found_config && !skip_ioapic_setup && nr_ioapics)
+                setup_IO_APIC();
+#endif
+        return 0;
+}
 
-        setup_local_APIC();
+void __init APIC_late_time_init(void)
+{
+        /* Improve our loops per jiffy estimate */
+        loops_per_jiffy = ((1000 + HZ - 1)/HZ)*cpu_khz;
+        boot_cpu_data.loops_per_jiffy = loops_per_jiffy;
+        cpu_data[0].loops_per_jiffy = loops_per_jiffy;
+
+        /* setup_apic_nmi_watchdog doesn't work properly before cpu_khz is
+         * initialized.  So redo it here to ensure the boot cpu is setup
+         * properly.
+         */
+        if (nmi_watchdog == NMI_LOCAL_APIC)
+                setup_apic_nmi_watchdog();
 
 #ifdef CONFIG_X86_IO_APIC
-        if (smp_found_config)
-                if (!skip_ioapic_setup && nr_ioapics)
-                        setup_IO_APIC();
+        if (smp_found_config && !skip_ioapic_setup && nr_ioapics)
+                IO_APIC_late_time_init();
 #endif
         setup_boot_APIC_clock();
-
-        return 0;
 }