x86: Hyper-V: Integrate the clocksource with Hyper-V detection code

The Hyper-V clocksource driver is best integrated with Hyper-V
detection code since: 

  (a) Linux guests running on Hyper-V require it

  (b) Integration into that code significanly reduces code size

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Cc: gregkh@suse.de
Cc: devel@linuxdriverproject.org
Cc: virtualization@lists.osdl.org
Link: http://lkml.kernel.org/r/1315434310-4827-1-git-send-email-kys@microsoft.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

3 files changed, 24 insertions, 102 deletions

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index d944bf6c50e9..0a630dd4b620 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -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 = {
diff --git a/drivers/staging/hv/Makefile b/drivers/staging/hv/Makefile
index 30046743a0b4..14e3c6a14ea4 100644
--- a/drivers/staging/hv/Makefile
+++ b/drivers/staging/hv/Makefile
@@ -1,4 +1,4 @@
-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
diff --git a/drivers/staging/hv/hv_timesource.c b/drivers/staging/hv/hv_timesource.c
deleted file mode 100644
index 2b0f9aaf9122..000000000000
--- a/drivers/staging/hv/hv_timesource.c
+++ /dev/null
@@ -1,101 +0,0 @@
-/*
- * 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");