kernel/arch/x86/xen/suspend.c

   1 #include <linux/types.h>
   2 #include <linux/tick.h>
   3
   4 #include <xen/xen.h>
   5 #include <xen/interface/xen.h>
   6 #include <xen/grant_table.h>
   7 #include <xen/events.h>
   8
   9 #include <asm/xen/hypercall.h>
  10 #include <asm/xen/page.h>
  11 #include <asm/fixmap.h>
  12
  13 #include "xen-ops.h"
  14 #include "mmu.h"
  15 #include "pmu.h"
  16
  17 static void xen_pv_pre_suspend(void)
  18 {
  19         xen_mm_pin_all();
  20
  21         xen_start_info->store_mfn = mfn_to_pfn(xen_start_info->store_mfn);
  22         xen_start_info->console.domU.mfn =
  23                 mfn_to_pfn(xen_start_info->console.domU.mfn);
  24
  25         BUG_ON(!irqs_disabled());
  26
  27         HYPERVISOR_shared_info = &xen_dummy_shared_info;
  28         if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
  29                                          __pte_ma(0), 0))
  30                 BUG();
  31 }
  32
  33 static void xen_hvm_post_suspend(int suspend_cancelled)
  34 {
  35 #ifdef CONFIG_XEN_PVHVM
  36         int cpu;
  37         if (!suspend_cancelled)
  38             xen_hvm_init_shared_info();
  39         xen_callback_vector();
  40         xen_unplug_emulated_devices();
  41         if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
  42                 for_each_online_cpu(cpu) {
  43                         xen_setup_runstate_info(cpu);
  44                 }
  45         }
  46 #endif
  47 }
  48
  49 static void xen_pv_post_suspend(int suspend_cancelled)
  50 {
  51         xen_build_mfn_list_list();
  52
  53         xen_setup_shared_info();
  54
  55         if (suspend_cancelled) {
  56                 xen_start_info->store_mfn =
  57                         pfn_to_mfn(xen_start_info->store_mfn);
  58                 xen_start_info->console.domU.mfn =
  59                         pfn_to_mfn(xen_start_info->console.domU.mfn);
  60         } else {
  61 #ifdef CONFIG_SMP
  62                 BUG_ON(xen_cpu_initialized_map == NULL);
  63                 cpumask_copy(xen_cpu_initialized_map, cpu_online_mask);
  64 #endif
  65                 xen_vcpu_restore();
  66         }
  67
  68         xen_mm_unpin_all();
  69 }
  70
  71 void xen_arch_pre_suspend(void)
  72 {
  73         if (xen_pv_domain())
  74                 xen_pv_pre_suspend();
  75 }
  76
  77 void xen_arch_post_suspend(int cancelled)
  78 {
  79         if (xen_pv_domain())
  80                 xen_pv_post_suspend(cancelled);
  81         else
  82                 xen_hvm_post_suspend(cancelled);
  83 }
  84
  85 static void xen_vcpu_notify_restore(void *data)
  86 {
  87         /* Boot processor notified via generic timekeeping_resume() */
  88         if (smp_processor_id() == 0)
  89                 return;
  90
  91         tick_resume_local();
  92 }
  93
  94 static void xen_vcpu_notify_suspend(void *data)
  95 {
  96         tick_suspend_local();
  97 }
  98
  99 void xen_arch_resume(void)
 100 {
 101         int cpu;
 102
 103         on_each_cpu(xen_vcpu_notify_restore, NULL, 1);
 104
 105         for_each_online_cpu(cpu)
 106                 xen_pmu_init(cpu);
 107 }
 108
 109 void xen_arch_suspend(void)
 110 {
 111         int cpu;
 112
 113         for_each_online_cpu(cpu)
 114                 xen_pmu_finish(cpu);
 115
 116         on_each_cpu(xen_vcpu_notify_suspend, NULL, 1);
 117 }