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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 S |
17 | #include <linux/hardirq.h> |
18 | #include <linux/interrupt.h> | |
a2a47c6c | 19 | #include <asm/processor.h> |
e08cae41 | 20 | #include <asm/hypervisor.h> |
a2a47c6c KS |
21 | #include <asm/hyperv.h> |
22 | #include <asm/mshyperv.h> | |
bc2b0331 S |
23 | #include <asm/desc.h> |
24 | #include <asm/idle.h> | |
25 | #include <asm/irq_regs.h> | |
a2a47c6c | 26 | |
e08cae41 | 27 | struct ms_hyperv_info ms_hyperv; |
9279aa55 | 28 | EXPORT_SYMBOL_GPL(ms_hyperv); |
a2a47c6c | 29 | |
e08cae41 | 30 | static bool __init ms_hyperv_platform(void) |
a2a47c6c | 31 | { |
e08cae41 PA |
32 | u32 eax; |
33 | u32 hyp_signature[3]; | |
a2a47c6c | 34 | |
e08cae41 PA |
35 | if (!boot_cpu_has(X86_FEATURE_HYPERVISOR)) |
36 | return false; | |
a2a47c6c | 37 | |
e08cae41 PA |
38 | cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS, |
39 | &eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]); | |
a2a47c6c | 40 | |
e08cae41 PA |
41 | return eax >= HYPERV_CPUID_MIN && |
42 | eax <= HYPERV_CPUID_MAX && | |
43 | !memcmp("Microsoft Hv", hyp_signature, 12); | |
a2a47c6c KS |
44 | } |
45 | ||
6f4151c8 S |
46 | static cycle_t read_hv_clock(struct clocksource *arg) |
47 | { | |
48 | cycle_t current_tick; | |
49 | /* | |
50 | * Read the partition counter to get the current tick count. This count | |
51 | * is set to 0 when the partition is created and is incremented in | |
52 | * 100 nanosecond units. | |
53 | */ | |
54 | rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick); | |
55 | return current_tick; | |
56 | } | |
57 | ||
58 | static struct clocksource hyperv_cs = { | |
59 | .name = "hyperv_clocksource", | |
60 | .rating = 400, /* use this when running on Hyperv*/ | |
61 | .read = read_hv_clock, | |
62 | .mask = CLOCKSOURCE_MASK(64), | |
63 | }; | |
64 | ||
e08cae41 | 65 | static void __init ms_hyperv_init_platform(void) |
a2a47c6c | 66 | { |
a2a47c6c | 67 | /* |
e08cae41 | 68 | * Extract the features and hints |
a2a47c6c | 69 | */ |
e08cae41 PA |
70 | ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES); |
71 | ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO); | |
a2a47c6c | 72 | |
e08cae41 PA |
73 | printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n", |
74 | ms_hyperv.features, ms_hyperv.hints); | |
6f4151c8 | 75 | |
32068f65 OH |
76 | if (ms_hyperv.features & HV_X64_MSR_TIME_REF_COUNT_AVAILABLE) |
77 | clocksource_register_hz(&hyperv_cs, NSEC_PER_SEC/100); | |
a2a47c6c | 78 | } |
e08cae41 PA |
79 | |
80 | const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = { | |
81 | .name = "Microsoft HyperV", | |
82 | .detect = ms_hyperv_platform, | |
83 | .init_platform = ms_hyperv_init_platform, | |
84 | }; | |
96f6e775 | 85 | EXPORT_SYMBOL(x86_hyper_ms_hyperv); |
bc2b0331 S |
86 | |
87 | #if IS_ENABLED(CONFIG_HYPERV) | |
88 | static int vmbus_irq = -1; | |
89 | static irq_handler_t vmbus_isr; | |
90 | ||
91 | void hv_register_vmbus_handler(int irq, irq_handler_t handler) | |
92 | { | |
7eff7ded S |
93 | /* |
94 | * Setup the IDT for hypervisor callback. | |
95 | */ | |
96 | alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, hyperv_callback_vector); | |
97 | ||
bc2b0331 S |
98 | vmbus_irq = irq; |
99 | vmbus_isr = handler; | |
100 | } | |
101 | ||
102 | void hyperv_vector_handler(struct pt_regs *regs) | |
103 | { | |
104 | struct pt_regs *old_regs = set_irq_regs(regs); | |
105 | struct irq_desc *desc; | |
106 | ||
107 | irq_enter(); | |
108 | exit_idle(); | |
109 | ||
110 | desc = irq_to_desc(vmbus_irq); | |
111 | ||
112 | if (desc) | |
113 | generic_handle_irq_desc(vmbus_irq, desc); | |
114 | ||
115 | irq_exit(); | |
116 | set_irq_regs(old_regs); | |
117 | } | |
118 | #else | |
119 | void hv_register_vmbus_handler(int irq, irq_handler_t handler) | |
120 | { | |
121 | } | |
122 | #endif | |
123 | EXPORT_SYMBOL_GPL(hv_register_vmbus_handler); |