arch/x86/kernel/smpboot_32.c

   1 /*
   2  *      x86 SMP booting functions
   3  *
   4  *      (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
   5  *      (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
   6  *
   7  *      Much of the core SMP work is based on previous work by Thomas Radke, to
   8  *      whom a great many thanks are extended.
   9  *
  10  *      Thanks to Intel for making available several different Pentium,
  11  *      Pentium Pro and Pentium-II/Xeon MP machines.
  12  *      Original development of Linux SMP code supported by Caldera.
  13  *
  14  *      This code is released under the GNU General Public License version 2 or
  15  *      later.
  16  *
  17  *      Fixes
  18  *              Felix Koop      :       NR_CPUS used properly
  19  *              Jose Renau      :       Handle single CPU case.
  20  *              Alan Cox        :       By repeated request 8) - Total BogoMIPS report.
  21  *              Greg Wright     :       Fix for kernel stacks panic.
  22  *              Erich Boleyn    :       MP v1.4 and additional changes.
  23  *      Matthias Sattler        :       Changes for 2.1 kernel map.
  24  *      Michel Lespinasse       :       Changes for 2.1 kernel map.
  25  *      Michael Chastain        :       Change trampoline.S to gnu as.
  26  *              Alan Cox        :       Dumb bug: 'B' step PPro's are fine
  27  *              Ingo Molnar     :       Added APIC timers, based on code
  28  *                                      from Jose Renau
  29  *              Ingo Molnar     :       various cleanups and rewrites
  30  *              Tigran Aivazian :       fixed "0.00 in /proc/uptime on SMP" bug.
  31  *      Maciej W. Rozycki       :       Bits for genuine 82489DX APICs
  32  *              Martin J. Bligh :       Added support for multi-quad systems
  33  *              Dave Jones      :       Report invalid combinations of Athlon CPUs.
  34 *               Rusty Russell   :       Hacked into shape for new "hotplug" boot process. */
  35
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/kernel.h>
  39
  40 #include <linux/mm.h>
  41 #include <linux/sched.h>
  42 #include <linux/kernel_stat.h>
  43 #include <linux/bootmem.h>
  44 #include <linux/notifier.h>
  45 #include <linux/cpu.h>
  46 #include <linux/percpu.h>
  47 #include <linux/nmi.h>
  48
  49 #include <linux/delay.h>
  50 #include <linux/mc146818rtc.h>
  51 #include <asm/tlbflush.h>
  52 #include <asm/desc.h>
  53 #include <asm/arch_hooks.h>
  54 #include <asm/nmi.h>
  55
  56 #include <mach_apic.h>
  57 #include <mach_wakecpu.h>
  58 #include <smpboot_hooks.h>
  59 #include <asm/vmi.h>
  60 #include <asm/mtrr.h>
  61
  62 /* which logical CPU number maps to which CPU (physical APIC ID) */
  63 u16 x86_cpu_to_apicid_init[NR_CPUS] __initdata =
  64                         { [0 ... NR_CPUS-1] = BAD_APICID };
  65 void *x86_cpu_to_apicid_early_ptr;
  66 DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID;
  67 EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);
  68
  69 u16 x86_bios_cpu_apicid_init[NR_CPUS] __initdata
  70                                 = { [0 ... NR_CPUS-1] = BAD_APICID };
  71 void *x86_bios_cpu_apicid_early_ptr;
  72 DEFINE_PER_CPU(u16, x86_bios_cpu_apicid) = BAD_APICID;
  73 EXPORT_PER_CPU_SYMBOL(x86_bios_cpu_apicid);
  74
  75 u8 apicid_2_node[MAX_APICID];
  76
  77 extern void map_cpu_to_logical_apicid(void);
  78 extern void unmap_cpu_to_logical_apicid(int cpu);
  79
  80 #ifdef CONFIG_HOTPLUG_CPU
  81 void cpu_exit_clear(void)
  82 {
  83         int cpu = raw_smp_processor_id();
  84
  85         idle_task_exit();
  86
  87         cpu_uninit();
  88         irq_ctx_exit(cpu);
  89
  90         cpu_clear(cpu, cpu_callout_map);
  91         cpu_clear(cpu, cpu_callin_map);
  92
  93         unmap_cpu_to_logical_apicid(cpu);
  94 }
  95 #endif
  96
  97 static int boot_cpu_logical_apicid;
  98 /* Where the IO area was mapped on multiquad, always 0 otherwise */
  99 void *xquad_portio;
 100 #ifdef CONFIG_X86_NUMAQ
 101 EXPORT_SYMBOL(xquad_portio);
 102 #endif
 103
 104 static void __init disable_smp(void)
 105 {
 106         cpu_possible_map = cpumask_of_cpu(0);
 107         cpu_present_map = cpumask_of_cpu(0);
 108         smpboot_clear_io_apic_irqs();
 109         if (smp_found_config)
 110                 phys_cpu_present_map =
 111                                 physid_mask_of_physid(boot_cpu_physical_apicid);
 112         else
 113                 phys_cpu_present_map = physid_mask_of_physid(0);
 114         map_cpu_to_logical_apicid();
 115         cpu_set(0, per_cpu(cpu_sibling_map, 0));
 116         cpu_set(0, per_cpu(cpu_core_map, 0));
 117 }
 118
 119 static int __init smp_sanity_check(unsigned max_cpus)
 120 {
 121         /*
 122          * If we couldn't find an SMP configuration at boot time,
 123          * get out of here now!
 124          */
 125         if (!smp_found_config && !acpi_lapic) {
 126                 printk(KERN_NOTICE "SMP motherboard not detected.\n");
 127                 disable_smp();
 128                 if (APIC_init_uniprocessor())
 129                         printk(KERN_NOTICE "Local APIC not detected."
 130                                            " Using dummy APIC emulation.\n");
 131                 return -1;
 132         }
 133
 134         /*
 135          * Should not be necessary because the MP table should list the boot
 136          * CPU too, but we do it for the sake of robustness anyway.
 137          * Makes no sense to do this check in clustered apic mode, so skip it
 138          */
 139         if (!check_phys_apicid_present(boot_cpu_physical_apicid)) {
 140                 printk("weird, boot CPU (#%d) not listed by the BIOS.\n",
 141                                 boot_cpu_physical_apicid);
 142                 physid_set(hard_smp_processor_id(), phys_cpu_present_map);
 143         }
 144
 145         /*
 146          * If we couldn't find a local APIC, then get out of here now!
 147          */
 148         if (APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid]) && !cpu_has_apic) {
 149                 printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
 150                         boot_cpu_physical_apicid);
 151                 printk(KERN_ERR "... forcing use of dummy APIC emulation. (tell your hw vendor)\n");
 152                 return -1;
 153         }
 154
 155         verify_local_APIC();
 156
 157         /*
 158          * If SMP should be disabled, then really disable it!
 159          */
 160         if (!max_cpus) {
 161                 smp_found_config = 0;
 162                 printk(KERN_INFO "SMP mode deactivated, forcing use of dummy APIC emulation.\n");
 163
 164                 if (nmi_watchdog == NMI_LOCAL_APIC) {
 165                         printk(KERN_INFO "activating minimal APIC for NMI watchdog use.\n");
 166                         connect_bsp_APIC();
 167                         setup_local_APIC();
 168                         end_local_APIC_setup();
 169                 }
 170                 return -1;
 171         }
 172         return 0;
 173 }
 174
 175 /* These are wrappers to interface to the new boot process.  Someone
 176    who understands all this stuff should rewrite it properly. --RR 15/Jul/02 */
 177 void __init native_smp_prepare_cpus(unsigned int max_cpus)
 178 {
 179         nmi_watchdog_default();
 180         cpu_callin_map = cpumask_of_cpu(0);
 181         mb();
 182
 183         /*
 184          * Setup boot CPU information
 185          */
 186         smp_store_cpu_info(0); /* Final full version of the data */
 187         boot_cpu_logical_apicid = logical_smp_processor_id();
 188         current_thread_info()->cpu = 0;
 189
 190         set_cpu_sibling_map(0);
 191
 192         if (smp_sanity_check(max_cpus) < 0) {
 193                 printk(KERN_INFO "SMP disabled\n");
 194                 disable_smp();
 195                 return;
 196         }
 197
 198         boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
 199
 200         connect_bsp_APIC();
 201         setup_local_APIC();
 202         end_local_APIC_setup();
 203         map_cpu_to_logical_apicid();
 204
 205         setup_portio_remap();
 206
 207         smpboot_setup_io_apic();
 208
 209         printk(KERN_INFO "CPU%d: ", 0);
 210         print_cpu_info(&cpu_data(0));
 211         setup_boot_clock();
 212 }
 213