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         if (!suspend_cancelled)
  37             xen_hvm_init_shared_info();
  38         xen_callback_vector();
  39         xen_unplug_emulated_devices();
  40         if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
  41                 for_each_online_cpu(cpu) {
  42                         xen_setup_runstate_info(cpu);
  43                 }
  44         }
  45 #endif
  46 }
  47
  48 static void xen_pv_post_suspend(int suspend_cancelled)
  49 {
  50         xen_build_mfn_list_list();
  51
  52         xen_setup_shared_info();
  53
  54         if (suspend_cancelled) {
  55                 xen_start_info->store_mfn =
  56                         pfn_to_mfn(xen_start_info->store_mfn);
  57                 xen_start_info->console.domU.mfn =
  58                         pfn_to_mfn(xen_start_info->console.domU.mfn);
  59         } else {
  60 #ifdef CONFIG_SMP
  61                 BUG_ON(xen_cpu_initialized_map == NULL);
  62                 cpumask_copy(xen_cpu_initialized_map, cpu_online_mask);
  63 #endif
  64                 xen_vcpu_restore();
  65         }
  66
  67         xen_mm_unpin_all();
  68 }
  69
  70 void xen_arch_pre_suspend(void)
  71 {
  72         if (xen_pv_domain())
  73                 xen_pv_pre_suspend();
  74 }
  75
  76 void xen_arch_post_suspend(int cancelled)
  77 {
  78         if (xen_pv_domain())
  79                 xen_pv_post_suspend(cancelled);
  80         else
  81                 xen_hvm_post_suspend(cancelled);
  82 }
  83
  84 static void xen_vcpu_notify_restore(void *data)
  85 {
  86         /* Boot processor notified via generic timekeeping_resume() */
  87         if (smp_processor_id() == 0)
  88                 return;
  89
  90         tick_resume_local();
  91 }
  92
  93 static void xen_vcpu_notify_suspend(void *data)
  94 {
  95         tick_suspend_local();
  96 }
  97
  98 void xen_arch_resume(void)
  99 {
 100         int cpu;
 101
 102         on_each_cpu(xen_vcpu_notify_restore, NULL, 1);
 103
 104         for_each_online_cpu(cpu)
 105                 xen_pmu_init(cpu);
 106 }
 107
 108 void xen_arch_suspend(void)
 109 {
 110         int cpu;
 111
 112         for_each_online_cpu(cpu)
 113                 xen_pmu_finish(cpu);
 114
 115         on_each_cpu(xen_vcpu_notify_suspend, NULL, 1);
 116 }