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> |
a2a47c6c | 21 | #include <asm/processor.h> |
e08cae41 | 22 | #include <asm/hypervisor.h> |
a2a47c6c KS |
23 | #include <asm/hyperv.h> |
24 | #include <asm/mshyperv.h> | |
bc2b0331 S |
25 | #include <asm/desc.h> |
26 | #include <asm/idle.h> | |
27 | #include <asm/irq_regs.h> | |
9e7827b5 | 28 | #include <asm/i8259.h> |
d68ce017 | 29 | #include <asm/apic.h> |
ca3ba2a2 | 30 | #include <asm/timer.h> |
a2a47c6c | 31 | |
e08cae41 | 32 | struct ms_hyperv_info ms_hyperv; |
9279aa55 | 33 | EXPORT_SYMBOL_GPL(ms_hyperv); |
a2a47c6c | 34 | |
3c433679 | 35 | #if IS_ENABLED(CONFIG_HYPERV) |
76d388cd | 36 | static void (*vmbus_handler)(void); |
1aec1696 TG |
37 | |
38 | void hyperv_vector_handler(struct pt_regs *regs) | |
39 | { | |
40 | struct pt_regs *old_regs = set_irq_regs(regs); | |
41 | ||
42 | irq_enter(); | |
43 | exit_idle(); | |
44 | ||
45 | inc_irq_stat(irq_hv_callback_count); | |
46 | if (vmbus_handler) | |
47 | vmbus_handler(); | |
48 | ||
49 | irq_exit(); | |
50 | set_irq_regs(old_regs); | |
51 | } | |
52 | ||
76d388cd | 53 | void hv_setup_vmbus_irq(void (*handler)(void)) |
1aec1696 TG |
54 | { |
55 | vmbus_handler = handler; | |
56 | /* | |
57 | * Setup the IDT for hypervisor callback. Prevent reallocation | |
58 | * at module reload. | |
59 | */ | |
60 | if (!test_bit(HYPERVISOR_CALLBACK_VECTOR, used_vectors)) | |
61 | alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, | |
62 | hyperv_callback_vector); | |
63 | } | |
64 | ||
76d388cd | 65 | void hv_remove_vmbus_irq(void) |
1aec1696 TG |
66 | { |
67 | /* We have no way to deallocate the interrupt gate */ | |
68 | vmbus_handler = NULL; | |
69 | } | |
70 | EXPORT_SYMBOL_GPL(hv_setup_vmbus_irq); | |
71 | EXPORT_SYMBOL_GPL(hv_remove_vmbus_irq); | |
72 | #endif | |
73 | ||
9df56f19 | 74 | static uint32_t __init ms_hyperv_platform(void) |
a2a47c6c | 75 | { |
e08cae41 PA |
76 | u32 eax; |
77 | u32 hyp_signature[3]; | |
a2a47c6c | 78 | |
e08cae41 | 79 | if (!boot_cpu_has(X86_FEATURE_HYPERVISOR)) |
9df56f19 | 80 | return 0; |
a2a47c6c | 81 | |
e08cae41 PA |
82 | cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS, |
83 | &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]); | |
a2a47c6c | 84 | |
9df56f19 JW |
85 | if (eax >= HYPERV_CPUID_MIN && |
86 | eax <= HYPERV_CPUID_MAX && | |
87 | !memcmp("Microsoft Hv", hyp_signature, 12)) | |
88 | return HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS; | |
89 | ||
90 | return 0; | |
a2a47c6c KS |
91 | } |
92 | ||
6f4151c8 S |
93 | static cycle_t read_hv_clock(struct clocksource *arg) |
94 | { | |
95 | cycle_t current_tick; | |
96 | /* | |
97 | * Read the partition counter to get the current tick count. This count | |
98 | * is set to 0 when the partition is created and is incremented in | |
99 | * 100 nanosecond units. | |
100 | */ | |
101 | rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick); | |
102 | return current_tick; | |
103 | } | |
104 | ||
105 | static struct clocksource hyperv_cs = { | |
106 | .name = "hyperv_clocksource", | |
107 | .rating = 400, /* use this when running on Hyperv*/ | |
108 | .read = read_hv_clock, | |
109 | .mask = CLOCKSOURCE_MASK(64), | |
32c6590d | 110 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
6f4151c8 S |
111 | }; |
112 | ||
e08cae41 | 113 | static void __init ms_hyperv_init_platform(void) |
a2a47c6c | 114 | { |
a2a47c6c | 115 | /* |
e08cae41 | 116 | * Extract the features and hints |
a2a47c6c | 117 | */ |
e08cae41 PA |
118 | ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES); |
119 | ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO); | |
a2a47c6c | 120 | |
e08cae41 PA |
121 | printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n", |
122 | ms_hyperv.features, ms_hyperv.hints); | |
6f4151c8 | 123 | |
90ab9d55 | 124 | #ifdef CONFIG_X86_LOCAL_APIC |
9e7827b5 S |
125 | if (ms_hyperv.features & HV_X64_MSR_APIC_FREQUENCY_AVAILABLE) { |
126 | /* | |
127 | * Get the APIC frequency. | |
128 | */ | |
4c08edd3 PA |
129 | u64 hv_lapic_frequency; |
130 | ||
9e7827b5 S |
131 | rdmsrl(HV_X64_MSR_APIC_FREQUENCY, hv_lapic_frequency); |
132 | hv_lapic_frequency = div_u64(hv_lapic_frequency, HZ); | |
133 | lapic_timer_frequency = hv_lapic_frequency; | |
134 | printk(KERN_INFO "HyperV: LAPIC Timer Frequency: %#x\n", | |
135 | lapic_timer_frequency); | |
9e7827b5 | 136 | } |
90ab9d55 | 137 | #endif |
9e7827b5 | 138 | |
32068f65 OH |
139 | if (ms_hyperv.features & HV_X64_MSR_TIME_REF_COUNT_AVAILABLE) |
140 | clocksource_register_hz(&hyperv_cs, NSEC_PER_SEC/100); | |
ca3ba2a2 JW |
141 | |
142 | #ifdef CONFIG_X86_IO_APIC | |
143 | no_timer_check = 1; | |
144 | #endif | |
145 | ||
a2a47c6c | 146 | } |
e08cae41 PA |
147 | |
148 | const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = { | |
149 | .name = "Microsoft HyperV", | |
150 | .detect = ms_hyperv_platform, | |
151 | .init_platform = ms_hyperv_init_platform, | |
152 | }; | |
96f6e775 | 153 | EXPORT_SYMBOL(x86_hyper_ms_hyperv); |