arch/x86/xen/suspend.c

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