xref: /openbmc/linux/arch/x86/xen/suspend.c (revision 3821a065)
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 }
116