x86: merge native_smp_prepare_cpus

With the previous changes, code for native_smp_prepare_cpus()
in i386 and x86_64 now look very similar. merge them into
smpboot.c. Minor differences are inside ifdef

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 26118b4..45119d3 100644 (file)
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -7,6 +7,7 @@
 #include <linux/err.h>
 #include <linux/nmi.h>
 
+#include <asm/acpi.h>
 #include <asm/desc.h>
 #include <asm/nmi.h>
 #include <asm/irq.h>
@@ -75,6 +76,8 @@ EXPORT_PER_CPU_SYMBOL(cpu_info);
 
 static atomic_t init_deasserted;
 
+static int boot_cpu_logical_apicid;
+
 /* ready for x86_64, no harm for x86, since it will overwrite after alloc */
 unsigned char *trampoline_base = __va(SMP_TRAMPOLINE_BASE);
 
@@ -1001,6 +1004,173 @@ int __cpuinit native_cpu_up(unsigned int cpu)
        return 0;
 }
 
+/*
+ * Fall back to non SMP mode after errors.
+ *
+ * RED-PEN audit/test this more. I bet there is more state messed up here.
+ */
+static __init void disable_smp(void)
+{
+       cpu_present_map = cpumask_of_cpu(0);
+       cpu_possible_map = cpumask_of_cpu(0);
+#ifdef CONFIG_X86_32
+       smpboot_clear_io_apic_irqs();
+#endif
+       if (smp_found_config)
+               phys_cpu_present_map =
+                               physid_mask_of_physid(boot_cpu_physical_apicid);
+       else
+               phys_cpu_present_map = physid_mask_of_physid(0);
+       map_cpu_to_logical_apicid();
+       cpu_set(0, per_cpu(cpu_sibling_map, 0));
+       cpu_set(0, per_cpu(cpu_core_map, 0));
+}
+
+/*
+ * Various sanity checks.
+ */
+static int __init smp_sanity_check(unsigned max_cpus)
+{
+       if (!physid_isset(hard_smp_processor_id(), phys_cpu_present_map)) {
+               printk(KERN_WARNING "weird, boot CPU (#%d) not listed"
+                                   "by the BIOS.\n", hard_smp_processor_id());
+               physid_set(hard_smp_processor_id(), phys_cpu_present_map);
+       }
+
+       /*
+        * If we couldn't find an SMP configuration at boot time,
+        * get out of here now!
+        */
+       if (!smp_found_config && !acpi_lapic) {
+               printk(KERN_NOTICE "SMP motherboard not detected.\n");
+               disable_smp();
+               if (APIC_init_uniprocessor())
+                       printk(KERN_NOTICE "Local APIC not detected."
+                                          " Using dummy APIC emulation.\n");
+               return -1;
+       }
+
+       /*
+        * Should not be necessary because the MP table should list the boot
+        * CPU too, but we do it for the sake of robustness anyway.
+        */
+       if (!check_phys_apicid_present(boot_cpu_physical_apicid)) {
+               printk(KERN_NOTICE
+                       "weird, boot CPU (#%d) not listed by the BIOS.\n",
+                       boot_cpu_physical_apicid);
+               physid_set(hard_smp_processor_id(), phys_cpu_present_map);
+       }
+
+       /*
+        * If we couldn't find a local APIC, then get out of here now!
+        */
+       if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) &&
+           !cpu_has_apic) {
+               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");
+               smpboot_clear_io_apic();
+               return -1;
+       }
+
+       verify_local_APIC();
+
+       /*
+        * If SMP should be disabled, then really disable it!
+        */
+       if (!max_cpus) {
+               printk(KERN_INFO "SMP mode deactivated,"
+                                "forcing use of dummy APIC emulation.\n");
+               smpboot_clear_io_apic();
+#ifdef CONFIG_X86_32
+               if (nmi_watchdog == NMI_LOCAL_APIC) {
+                       printk(KERN_INFO "activating minimal APIC for"
+                                        "NMI watchdog use.\n");
+                       connect_bsp_APIC();
+                       setup_local_APIC();
+                       end_local_APIC_setup();
+               }
+#endif
+               return -1;
+       }
+
+       return 0;
+}
+
+static void __init smp_cpu_index_default(void)
+{
+       int i;
+       struct cpuinfo_x86 *c;
+
+       for_each_cpu_mask(i, cpu_possible_map) {
+               c = &cpu_data(i);
+               /* mark all to hotplug */
+               c->cpu_index = NR_CPUS;
+       }
+}
+
+/*
+ * Prepare for SMP bootup.  The MP table or ACPI has been read
+ * earlier.  Just do some sanity checking here and enable APIC mode.
+ */
+void __init native_smp_prepare_cpus(unsigned int max_cpus)
+{
+       nmi_watchdog_default();
+       smp_cpu_index_default();
+       current_cpu_data = boot_cpu_data;
+       cpu_callin_map = cpumask_of_cpu(0);
+       mb();
+       /*
+        * Setup boot CPU information
+        */
+       smp_store_cpu_info(0); /* Final full version of the data */
+       boot_cpu_logical_apicid = logical_smp_processor_id();
+       current_thread_info()->cpu = 0;  /* needed? */
+       set_cpu_sibling_map(0);
+
+       if (smp_sanity_check(max_cpus) < 0) {
+               printk(KERN_INFO "SMP disabled\n");
+               disable_smp();
+               return;
+       }
+
+       if (GET_APIC_ID(apic_read(APIC_ID)) != boot_cpu_physical_apicid) {
+               panic("Boot APIC ID in local APIC unexpected (%d vs %d)",
+                    GET_APIC_ID(apic_read(APIC_ID)), boot_cpu_physical_apicid);
+               /* Or can we switch back to PIC here? */
+       }
+
+#ifdef CONFIG_X86_32
+       connect_bsp_APIC();
+#endif
+       /*
+        * Switch from PIC to APIC mode.
+        */
+       setup_local_APIC();
+
+#ifdef CONFIG_X86_64
+       /*
+        * Enable IO APIC before setting up error vector
+        */
+       if (!skip_ioapic_setup && nr_ioapics)
+               enable_IO_APIC();
+#endif
+       end_local_APIC_setup();
+
+       map_cpu_to_logical_apicid();
+
+       setup_portio_remap();
+
+       smpboot_setup_io_apic();
+       /*
+        * Set up local APIC timer on boot CPU.
+        */
+
+       printk(KERN_INFO "CPU%d: ", 0);
+       print_cpu_info(&cpu_data(0));
+       setup_boot_clock();
+}
 /*
  * Early setup to make printk work.
  */

diff --cc arch/x86/kernel/smpboot_32.c
Simple merge

diff --cc arch/x86/kernel/smpboot_64.c
Simple merge