x86: Hyper-V: Integrate the clocksource with Hyper-V detection code (6f4151c8) · Commits · 戴 / test

arch/x86/kernel/cpu/mshyperv.c

+23 −0

Original line number	Diff line number	Diff line
		@@ -11,6 +11,8 @@
		*/

		#include <linux/types.h>
		#include <linux/time.h>
		#include <linux/clocksource.h>
		#include <linux/module.h>
		#include <asm/processor.h>
		#include <asm/hypervisor.h>
		@@ -36,6 +38,25 @@ static bool __init ms_hyperv_platform(void)
		!memcmp("Microsoft Hv", hyp_signature, 12);
		}

		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),
		};

		static void __init ms_hyperv_init_platform(void)
		{
		/*
		@@ -46,6 +67,8 @@ static void __init ms_hyperv_init_platform(void)

		printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n",
		ms_hyperv.features, ms_hyperv.hints);

		clocksource_register_hz(&hyperv_cs, NSEC_PER_SEC/100);
		}

		const __refconst struct hypervisor_x86 x86_hyper_ms_hyperv = {

drivers/staging/hv/Makefile

+1 −1

Original line number	Diff line number	Diff line
		obj-$(CONFIG_HYPERV) += hv_vmbus.o hv_timesource.o
		obj-$(CONFIG_HYPERV) += hv_vmbus.o
		obj-$(CONFIG_HYPERV_STORAGE) += hv_storvsc.o
		obj-$(CONFIG_HYPERV_BLOCK) += hv_blkvsc.o
		obj-$(CONFIG_HYPERV_NET) += hv_netvsc.o

drivers/staging/hv/hv_timesource.c

deleted100644 → 0

+0 −101

Original line number	Diff line number	Diff line
		/*
		* A clocksource for Linux running on HyperV.
		*
		*
		* 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 version 2 as
		* published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful, but
		* WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
		* NON INFRINGEMENT. See the GNU General Public License for more
		* details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
		*
		*/
		#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

		#include <linux/clocksource.h>
		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/pci.h>
		#include <linux/dmi.h>
		#include <asm/hyperv.h>
		#include <asm/mshyperv.h>
		#include <asm/hypervisor.h>

		#define HV_CLOCK_SHIFT 22

		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),
		/*
		* The time ref counter in HyperV is in 100ns units.
		* The definition of mult is:
		* mult/2^shift = ns/cyc = 100
		* mult = (100 << shift)
		*/
		.mult = (100 << HV_CLOCK_SHIFT),
		.shift = HV_CLOCK_SHIFT,
		};

		static const struct dmi_system_id __initconst
		hv_timesource_dmi_table[] __maybe_unused = {
		{
		.ident = "Hyper-V",
		.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
		DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
		DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
		},
		},
		{ },
		};
		MODULE_DEVICE_TABLE(dmi, hv_timesource_dmi_table);

		static const struct pci_device_id __initconst
		hv_timesource_pci_table[] __maybe_unused = {
		{ PCI_DEVICE(0x1414, 0x5353) }, /* VGA compatible controller */
		{ 0 }
		};
		MODULE_DEVICE_TABLE(pci, hv_timesource_pci_table);


		static int __init init_hv_clocksource(void)
		{
		if ((x86_hyper != &x86_hyper_ms_hyperv) \|\|
		!(ms_hyperv.features & HV_X64_MSR_TIME_REF_COUNT_AVAILABLE))
		return -ENODEV;

		if (!dmi_check_system(hv_timesource_dmi_table))
		return -ENODEV;

		pr_info("Registering HyperV clock source\n");
		return clocksource_register(&hyperv_cs);
		}

		module_init(init_hv_clocksource);
		MODULE_DESCRIPTION("HyperV based clocksource");
		MODULE_AUTHOR("K. Y. Srinivasan <ksrinivasan@novell.com>");
		MODULE_LICENSE("GPL");

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