Commit | Line | Data |
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a2a47c6c KS |
1 | /* |
2 | * HyperV Detection code. | |
3 | * | |
4 | * Copyright (C) 2010, Novell, Inc. | |
5 | * Author : K. Y. Srinivasan <ksrinivasan@novell.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9fa02317 | 9 | * the Free Software Foundation; version 2 of the License. |
a2a47c6c KS |
10 | * |
11 | */ | |
12 | ||
13 | #include <linux/types.h> | |
6f4151c8 S |
14 | #include <linux/time.h> |
15 | #include <linux/clocksource.h> | |
3998d095 | 16 | #include <linux/module.h> |
bc2b0331 | 17 | #include <linux/hardirq.h> |
9e7827b5 | 18 | #include <linux/efi.h> |
bc2b0331 | 19 | #include <linux/interrupt.h> |
1aec1696 | 20 | #include <linux/irq.h> |
2517281d | 21 | #include <linux/kexec.h> |
a2a47c6c | 22 | #include <asm/processor.h> |
e08cae41 | 23 | #include <asm/hypervisor.h> |
a2a47c6c KS |
24 | #include <asm/hyperv.h> |
25 | #include <asm/mshyperv.h> | |
bc2b0331 S |
26 | #include <asm/desc.h> |
27 | #include <asm/idle.h> | |
28 | #include <asm/irq_regs.h> | |
9e7827b5 | 29 | #include <asm/i8259.h> |
d68ce017 | 30 | #include <asm/apic.h> |
ca3ba2a2 | 31 | #include <asm/timer.h> |
2517281d | 32 | #include <asm/reboot.h> |
a2a47c6c | 33 | |
e08cae41 | 34 | struct ms_hyperv_info ms_hyperv; |
9279aa55 | 35 | EXPORT_SYMBOL_GPL(ms_hyperv); |
a2a47c6c | 36 | |
2517281d VK |
37 | static void (*hv_kexec_handler)(void); |
38 | ||
3c433679 | 39 | #if IS_ENABLED(CONFIG_HYPERV) |
76d388cd | 40 | static void (*vmbus_handler)(void); |
1aec1696 TG |
41 | |
42 | void hyperv_vector_handler(struct pt_regs *regs) | |
43 | { | |
44 | struct pt_regs *old_regs = set_irq_regs(regs); | |
45 | ||
6af7faf6 | 46 | entering_irq(); |
1aec1696 TG |
47 | inc_irq_stat(irq_hv_callback_count); |
48 | if (vmbus_handler) | |
49 | vmbus_handler(); | |
50 | ||
6af7faf6 | 51 | exiting_irq(); |
1aec1696 TG |
52 | set_irq_regs(old_regs); |
53 | } | |
54 | ||
76d388cd | 55 | void hv_setup_vmbus_irq(void (*handler)(void)) |
1aec1696 TG |
56 | { |
57 | vmbus_handler = handler; | |
58 | /* | |
59 | * Setup the IDT for hypervisor callback. Prevent reallocation | |
60 | * at module reload. | |
61 | */ | |
62 | if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors)) | |
63 | alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, | |
64 | hyperv_callback_vector); | |
65 | } | |
66 | ||
76d388cd | 67 | void hv_remove_vmbus_irq(void) |
1aec1696 TG |
68 | { |
69 | /* We have no way to deallocate the interrupt gate */ | |
70 | vmbus_handler = NULL; | |
71 | } | |
72 | EXPORT_SYMBOL_GPL(hv_setup_vmbus_irq); | |
73 | EXPORT_SYMBOL_GPL(hv_remove_vmbus_irq); | |
2517281d VK |
74 | |
75 | void hv_setup_kexec_handler(void (*handler)(void)) | |
76 | { | |
77 | hv_kexec_handler = handler; | |
78 | } | |
79 | EXPORT_SYMBOL_GPL(hv_setup_kexec_handler); | |
80 | ||
81 | void hv_remove_kexec_handler(void) | |
82 | { | |
83 | hv_kexec_handler = NULL; | |
84 | } | |
85 | EXPORT_SYMBOL_GPL(hv_remove_kexec_handler); | |
1aec1696 TG |
86 | #endif |
87 | ||
2517281d VK |
88 | static void hv_machine_shutdown(void) |
89 | { | |
90 | if (kexec_in_progress && hv_kexec_handler) | |
91 | hv_kexec_handler(); | |
92 | native_machine_shutdown(); | |
93 | } | |
94 | ||
9df56f19 | 95 | static uint32_t __init ms_hyperv_platform(void) |
a2a47c6c | 96 | { |
e08cae41 PA |
97 | u32 eax; |
98 | u32 hyp_signature[3]; | |
a2a47c6c | 99 | |
e08cae41 | 100 | if (!boot_cpu_has(X86_FEATURE_HYPERVISOR)) |
9df56f19 | 101 | return 0; |
a2a47c6c | 102 | |
e08cae41 PA |
103 | cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS, |
104 | &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]); | |
a2a47c6c | 105 | |
9df56f19 JW |
106 | if (eax >= HYPERV_CPUID_MIN && |
107 | eax <= HYPERV_CPUID_MAX && | |
108 | !memcmp("Microsoft Hv", hyp_signature, 12)) | |
109 | return HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS; | |
110 | ||
111 | return 0; | |
a2a47c6c KS |
112 | } |
113 | ||
6f4151c8 S |
114 | static cycle_t read_hv_clock(struct clocksource *arg) |
115 | { | |
116 | cycle_t current_tick; | |
117 | /* | |
118 | * Read the partition counter to get the current tick count. This count | |
119 | * is set to 0 when the partition is created and is incremented in | |
120 | * 100 nanosecond units. | |
121 | */ | |
122 | rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick); | |
123 | return current_tick; | |
124 | } | |
125 | ||
126 | static struct clocksource hyperv_cs = { | |
127 | .name = "hyperv_clocksource", | |
128 | .rating = 400, /* use this when running on Hyperv*/ | |
129 | .read = read_hv_clock, | |
130 | .mask = CLOCKSOURCE_MASK(64), | |
32c6590d | 131 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
6f4151c8 S |
132 | }; |
133 | ||
e08cae41 | 134 | static void __init ms_hyperv_init_platform(void) |
a2a47c6c | 135 | { |
a2a47c6c | 136 | /* |
e08cae41 | 137 | * Extract the features and hints |
a2a47c6c | 138 | */ |
e08cae41 PA |
139 | ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES); |
140 | ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO); | |
a2a47c6c | 141 | |
e08cae41 PA |
142 | printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n", |
143 | ms_hyperv.features, ms_hyperv.hints); | |
6f4151c8 | 144 | |
90ab9d55 | 145 | #ifdef CONFIG_X86_LOCAL_APIC |
9e7827b5 S |
146 | if (ms_hyperv.features & HV_X64_MSR_APIC_FREQUENCY_AVAILABLE) { |
147 | /* | |
148 | * Get the APIC frequency. | |
149 | */ | |
4c08edd3 PA |
150 | u64 hv_lapic_frequency; |
151 | ||
9e7827b5 S |
152 | rdmsrl(HV_X64_MSR_APIC_FREQUENCY, hv_lapic_frequency); |
153 | hv_lapic_frequency = div_u64(hv_lapic_frequency, HZ); | |
154 | lapic_timer_frequency = hv_lapic_frequency; | |
155 | printk(KERN_INFO "HyperV: LAPIC Timer Frequency: %#x\n", | |
156 | lapic_timer_frequency); | |
9e7827b5 | 157 | } |
90ab9d55 | 158 | #endif |
9e7827b5 | 159 | |
32068f65 OH |
160 | if (ms_hyperv.features & HV_X64_MSR_TIME_REF_COUNT_AVAILABLE) |
161 | clocksource_register_hz(&hyperv_cs, NSEC_PER_SEC/100); | |
ca3ba2a2 JW |
162 | |
163 | #ifdef CONFIG_X86_IO_APIC | |
164 | no_timer_check = 1; | |
165 | #endif | |
166 | ||
2517281d | 167 | machine_ops.shutdown = hv_machine_shutdown; |
a2a47c6c | 168 | } |
e08cae41 PA |
169 | |
170 | const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = { | |
171 | .name = "Microsoft HyperV", | |
172 | .detect = ms_hyperv_platform, | |
173 | .init_platform = ms_hyperv_init_platform, | |
174 | }; | |
96f6e775 | 175 | EXPORT_SYMBOL(x86_hyper_ms_hyperv); |