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Subject[tip:x86/platform] x86/jailhouse: Set up timekeeping
Commit-ID:  e85eb632f651e70252bb18b292efaf6961164e32
Gitweb: https://git.kernel.org/tip/e85eb632f651e70252bb18b292efaf6961164e32
Author: Jan Kiszka <jan.kiszka@siemens.com>
AuthorDate: Mon, 27 Nov 2017 09:11:49 +0100
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Sun, 14 Jan 2018 21:11:56 +0100

x86/jailhouse: Set up timekeeping

Get the precalibrated frequencies for the TSC and the APIC timer from
the Jailhouse platform info and set the kernel values accordingly.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: jailhouse-dev@googlegroups.com
Link: https://lkml.kernel.org/r/b2557426332fc337a74d3141cb920f7dce9ad601.1511770314.git.jan.kiszka@siemens.com

---
arch/x86/kernel/jailhouse.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/arch/x86/kernel/jailhouse.c b/arch/x86/kernel/jailhouse.c
index 21c1077..34cf9d3 100644
--- a/arch/x86/kernel/jailhouse.c
+++ b/arch/x86/kernel/jailhouse.c
@@ -16,6 +16,7 @@
#include <asm/setup.h>

static __initdata struct jailhouse_setup_data setup_data;
+static unsigned int precalibrated_tsc_khz;

static uint32_t jailhouse_cpuid_base(void)
{
@@ -31,6 +32,16 @@ static uint32_t __init jailhouse_detect(void)
return jailhouse_cpuid_base();
}

+static void __init jailhouse_timer_init(void)
+{
+ lapic_timer_frequency = setup_data.apic_khz * (1000 / HZ);
+}
+
+static unsigned long jailhouse_get_tsc(void)
+{
+ return precalibrated_tsc_khz;
+}
+
static void __init jailhouse_get_smp_config(unsigned int early)
{
unsigned int cpu;
@@ -66,8 +77,12 @@ static void __init jailhouse_init_platform(void)
struct setup_data header;
void *mapping;

+ x86_init.timers.timer_init = jailhouse_timer_init;
x86_init.mpparse.get_smp_config = jailhouse_get_smp_config;

+ x86_platform.calibrate_cpu = jailhouse_get_tsc;
+ x86_platform.calibrate_tsc = jailhouse_get_tsc;
+
while (pa_data) {
mapping = early_memremap(pa_data, sizeof(header));
memcpy(&header, mapping, sizeof(header));
@@ -95,6 +110,8 @@ static void __init jailhouse_init_platform(void)

pmtmr_ioport = setup_data.pm_timer_address;
pr_debug("Jailhouse: PM-Timer IO Port: %#x\n", pmtmr_ioport);
+
+ precalibrated_tsc_khz = setup_data.tsc_khz;
}

bool jailhouse_paravirt(void)
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