2010-05-06 19:08:41 +00:00
|
|
|
/*
|
|
|
|
* HyperV Detection code.
|
|
|
|
*
|
|
|
|
* Copyright (C) 2010, Novell, Inc.
|
|
|
|
* Author : K. Y. Srinivasan <ksrinivasan@novell.com>
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License as published by
|
2010-05-07 23:55:41 +00:00
|
|
|
* the Free Software Foundation; version 2 of the License.
|
2010-05-06 19:08:41 +00:00
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/types.h>
|
2011-09-07 22:25:10 +00:00
|
|
|
#include <linux/time.h>
|
|
|
|
#include <linux/clocksource.h>
|
2010-05-10 05:46:54 +00:00
|
|
|
#include <linux/module.h>
|
2013-02-04 01:22:39 +00:00
|
|
|
#include <linux/hardirq.h>
|
2013-09-30 15:28:52 +00:00
|
|
|
#include <linux/efi.h>
|
2013-02-04 01:22:39 +00:00
|
|
|
#include <linux/interrupt.h>
|
2010-05-06 19:08:41 +00:00
|
|
|
#include <asm/processor.h>
|
2010-05-07 23:57:28 +00:00
|
|
|
#include <asm/hypervisor.h>
|
2010-05-06 19:08:41 +00:00
|
|
|
#include <asm/hyperv.h>
|
|
|
|
#include <asm/mshyperv.h>
|
2013-02-04 01:22:39 +00:00
|
|
|
#include <asm/desc.h>
|
|
|
|
#include <asm/idle.h>
|
|
|
|
#include <asm/irq_regs.h>
|
2013-09-30 15:28:52 +00:00
|
|
|
#include <asm/i8259.h>
|
2010-05-06 19:08:41 +00:00
|
|
|
|
2010-05-07 23:57:28 +00:00
|
|
|
struct ms_hyperv_info ms_hyperv;
|
2010-06-28 14:48:55 +00:00
|
|
|
EXPORT_SYMBOL_GPL(ms_hyperv);
|
2010-05-06 19:08:41 +00:00
|
|
|
|
2013-07-25 08:54:35 +00:00
|
|
|
static uint32_t __init ms_hyperv_platform(void)
|
2010-05-06 19:08:41 +00:00
|
|
|
{
|
2010-05-07 23:57:28 +00:00
|
|
|
u32 eax;
|
|
|
|
u32 hyp_signature[3];
|
2010-05-06 19:08:41 +00:00
|
|
|
|
2010-05-07 23:57:28 +00:00
|
|
|
if (!boot_cpu_has(X86_FEATURE_HYPERVISOR))
|
2013-07-25 08:54:35 +00:00
|
|
|
return 0;
|
2010-05-06 19:08:41 +00:00
|
|
|
|
2010-05-07 23:57:28 +00:00
|
|
|
cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS,
|
|
|
|
&eax, &hyp_signature[0], &hyp_signature[1], &hyp_signature[2]);
|
2010-05-06 19:08:41 +00:00
|
|
|
|
2013-07-25 08:54:35 +00:00
|
|
|
if (eax >= HYPERV_CPUID_MIN &&
|
|
|
|
eax <= HYPERV_CPUID_MAX &&
|
|
|
|
!memcmp("Microsoft Hv", hyp_signature, 12))
|
|
|
|
return HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS;
|
|
|
|
|
|
|
|
return 0;
|
2010-05-06 19:08:41 +00:00
|
|
|
}
|
|
|
|
|
2011-09-07 22:25:10 +00:00
|
|
|
static cycle_t read_hv_clock(struct clocksource *arg)
|
|
|
|
{
|
|
|
|
cycle_t current_tick;
|
|
|
|
/*
|
|
|
|
* Read the partition counter to get the current tick count. This count
|
|
|
|
* is set to 0 when the partition is created and is incremented in
|
|
|
|
* 100 nanosecond units.
|
|
|
|
*/
|
|
|
|
rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick);
|
|
|
|
return current_tick;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct clocksource hyperv_cs = {
|
|
|
|
.name = "hyperv_clocksource",
|
|
|
|
.rating = 400, /* use this when running on Hyperv*/
|
|
|
|
.read = read_hv_clock,
|
|
|
|
.mask = CLOCKSOURCE_MASK(64),
|
|
|
|
};
|
|
|
|
|
2010-05-07 23:57:28 +00:00
|
|
|
static void __init ms_hyperv_init_platform(void)
|
2010-05-06 19:08:41 +00:00
|
|
|
{
|
2013-09-30 15:28:52 +00:00
|
|
|
u64 hv_lapic_frequency;
|
|
|
|
|
2010-05-06 19:08:41 +00:00
|
|
|
/*
|
2010-05-07 23:57:28 +00:00
|
|
|
* Extract the features and hints
|
2010-05-06 19:08:41 +00:00
|
|
|
*/
|
2010-05-07 23:57:28 +00:00
|
|
|
ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES);
|
|
|
|
ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);
|
2010-05-06 19:08:41 +00:00
|
|
|
|
2010-05-07 23:57:28 +00:00
|
|
|
printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n",
|
|
|
|
ms_hyperv.features, ms_hyperv.hints);
|
2011-09-07 22:25:10 +00:00
|
|
|
|
2013-09-30 15:28:52 +00:00
|
|
|
if (ms_hyperv.features & HV_X64_MSR_APIC_FREQUENCY_AVAILABLE) {
|
|
|
|
/*
|
|
|
|
* Get the APIC frequency.
|
|
|
|
*/
|
|
|
|
rdmsrl(HV_X64_MSR_APIC_FREQUENCY, hv_lapic_frequency);
|
|
|
|
hv_lapic_frequency = div_u64(hv_lapic_frequency, HZ);
|
|
|
|
lapic_timer_frequency = hv_lapic_frequency;
|
|
|
|
printk(KERN_INFO "HyperV: LAPIC Timer Frequency: %#x\n",
|
|
|
|
lapic_timer_frequency);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* On Hyper-V, when we are booting off an EFI firmware stack,
|
|
|
|
* we do not have many legacy devices including PIC, PIT etc.
|
|
|
|
*/
|
|
|
|
if (efi_enabled(EFI_BOOT)) {
|
|
|
|
printk(KERN_INFO "HyperV: Using null_legacy_pic\n");
|
|
|
|
legacy_pic = &null_legacy_pic;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-02-04 01:22:37 +00:00
|
|
|
if (ms_hyperv.features & HV_X64_MSR_TIME_REF_COUNT_AVAILABLE)
|
|
|
|
clocksource_register_hz(&hyperv_cs, NSEC_PER_SEC/100);
|
2010-05-06 19:08:41 +00:00
|
|
|
}
|
2010-05-07 23:57:28 +00:00
|
|
|
|
|
|
|
const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
|
|
|
|
.name = "Microsoft HyperV",
|
|
|
|
.detect = ms_hyperv_platform,
|
|
|
|
.init_platform = ms_hyperv_init_platform,
|
|
|
|
};
|
2010-05-09 08:10:34 +00:00
|
|
|
EXPORT_SYMBOL(x86_hyper_ms_hyperv);
|
2013-02-04 01:22:39 +00:00
|
|
|
|
|
|
|
#if IS_ENABLED(CONFIG_HYPERV)
|
|
|
|
static int vmbus_irq = -1;
|
|
|
|
static irq_handler_t vmbus_isr;
|
|
|
|
|
|
|
|
void hv_register_vmbus_handler(int irq, irq_handler_t handler)
|
|
|
|
{
|
2013-04-18 15:44:46 +00:00
|
|
|
/*
|
|
|
|
* Setup the IDT for hypervisor callback.
|
|
|
|
*/
|
|
|
|
alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, hyperv_callback_vector);
|
|
|
|
|
2013-02-04 01:22:39 +00:00
|
|
|
vmbus_irq = irq;
|
|
|
|
vmbus_isr = handler;
|
|
|
|
}
|
|
|
|
|
|
|
|
void hyperv_vector_handler(struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
struct pt_regs *old_regs = set_irq_regs(regs);
|
|
|
|
struct irq_desc *desc;
|
|
|
|
|
|
|
|
irq_enter();
|
|
|
|
exit_idle();
|
|
|
|
|
|
|
|
desc = irq_to_desc(vmbus_irq);
|
|
|
|
|
|
|
|
if (desc)
|
|
|
|
generic_handle_irq_desc(vmbus_irq, desc);
|
|
|
|
|
|
|
|
irq_exit();
|
|
|
|
set_irq_regs(old_regs);
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
void hv_register_vmbus_handler(int irq, irq_handler_t handler)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
EXPORT_SYMBOL_GPL(hv_register_vmbus_handler);
|