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Message-ID: <tip-18e84a2dff00c3c817161a105332cd3fc7592648@git.kernel.org>
Date: Thu, 27 Jun 2019 16:51:07 -0700
From: tip-bot for Thomas Gleixner <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: eranian@...gle.com, mingo@...nel.org, ashok.raj@...el.com,
linux-kernel@...r.kernel.org, Suravee.Suthikulpanit@....com,
peterz@...radead.org, ricardo.neri-calderon@...ux.intel.com,
andi.kleen@...el.com, ravi.v.shankar@...el.com, tglx@...utronix.de,
hpa@...or.com
Subject: [tip:x86/timers] x86/hpet: Wrap legacy clockevent in hpet_channel
Commit-ID: 18e84a2dff00c3c817161a105332cd3fc7592648
Gitweb: https://git.kernel.org/tip/18e84a2dff00c3c817161a105332cd3fc7592648
Author: Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Sun, 23 Jun 2019 15:24:05 +0200
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 28 Jun 2019 00:57:25 +0200
x86/hpet: Wrap legacy clockevent in hpet_channel
For HPET channel 0 there exist two clockevent structures right now:
- the static hpet_clockevent
- the clockevent in channel 0 storage
The goal is to use the clockevent in the channel storage, remove the static
variable and share code with the MSI implementation.
As a first step wrap the legacy clockevent into a hpet_channel struct and
convert the users.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc: Ashok Raj <ashok.raj@...el.com>
Cc: Andi Kleen <andi.kleen@...el.com>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Ravi Shankar <ravi.v.shankar@...el.com>
Link: https://lkml.kernel.org/r/20190623132436.368141247@linutronix.de
---
arch/x86/kernel/hpet.c | 49 +++++++++++++++++++++++++++----------------------
1 file changed, 27 insertions(+), 22 deletions(-)
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 985a2246d20c..19e3ac81c3b9 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -66,7 +66,7 @@ bool boot_hpet_disable;
bool hpet_force_user;
static bool hpet_verbose;
-static struct clock_event_device hpet_clockevent;
+static struct hpet_channel hpet_channel0;
static inline
struct hpet_channel *clockevent_to_channel(struct clock_event_device *evt)
@@ -294,7 +294,7 @@ static void hpet_enable_legacy_int(void)
hpet_legacy_int_enabled = true;
}
-static void hpet_legacy_clockevent_register(void)
+static void hpet_legacy_clockevent_register(struct hpet_channel *hc)
{
/* Start HPET legacy interrupts */
hpet_enable_legacy_int();
@@ -303,10 +303,10 @@ static void hpet_legacy_clockevent_register(void)
* Start HPET with the boot CPU's cpumask and make it global after
* the IO_APIC has been initialized.
*/
- hpet_clockevent.cpumask = cpumask_of(boot_cpu_data.cpu_index);
- clockevents_config_and_register(&hpet_clockevent, hpet_freq,
+ hc->evt.cpumask = cpumask_of(boot_cpu_data.cpu_index);
+ clockevents_config_and_register(&hc->evt, hpet_freq,
HPET_MIN_PROG_DELTA, 0x7FFFFFFF);
- global_clock_event = &hpet_clockevent;
+ global_clock_event = &hc->evt;
pr_debug("Clockevent registered\n");
}
@@ -433,19 +433,21 @@ static int hpet_legacy_next_event(unsigned long delta,
}
/*
- * The HPET clock event device
+ * The HPET clock event device wrapped in a channel for conversion
*/
-static struct clock_event_device hpet_clockevent = {
- .name = "hpet",
- .features = CLOCK_EVT_FEAT_PERIODIC |
- CLOCK_EVT_FEAT_ONESHOT,
- .set_state_periodic = hpet_legacy_set_periodic,
- .set_state_oneshot = hpet_legacy_set_oneshot,
- .set_state_shutdown = hpet_legacy_shutdown,
- .tick_resume = hpet_legacy_resume,
- .set_next_event = hpet_legacy_next_event,
- .irq = 0,
- .rating = 50,
+static struct hpet_channel hpet_channel0 = {
+ .evt = {
+ .name = "hpet",
+ .features = CLOCK_EVT_FEAT_PERIODIC |
+ CLOCK_EVT_FEAT_ONESHOT,
+ .set_state_periodic = hpet_legacy_set_periodic,
+ .set_state_oneshot = hpet_legacy_set_oneshot,
+ .set_state_shutdown = hpet_legacy_shutdown,
+ .tick_resume = hpet_legacy_resume,
+ .set_next_event = hpet_legacy_next_event,
+ .irq = 0,
+ .rating = 50,
+ }
};
/*
@@ -916,7 +918,7 @@ int __init hpet_enable(void)
clocksource_register_hz(&clocksource_hpet, (u32)hpet_freq);
if (id & HPET_ID_LEGSUP) {
- hpet_legacy_clockevent_register();
+ hpet_legacy_clockevent_register(&hpet_channel0);
hpet_base.channels[0].mode = HPET_MODE_LEGACY;
if (IS_ENABLED(CONFIG_HPET_EMULATE_RTC))
hpet_base.channels[1].mode = HPET_MODE_LEGACY;
@@ -1101,10 +1103,11 @@ int hpet_rtc_timer_init(void)
return 0;
if (!hpet_default_delta) {
+ struct clock_event_device *evt = &hpet_channel0.evt;
uint64_t clc;
- clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC;
- clc >>= hpet_clockevent.shift + DEFAULT_RTC_SHIFT;
+ clc = (uint64_t) evt->mult * NSEC_PER_SEC;
+ clc >>= evt->shift + DEFAULT_RTC_SHIFT;
hpet_default_delta = clc;
}
@@ -1198,9 +1201,11 @@ int hpet_set_periodic_freq(unsigned long freq)
if (freq <= DEFAULT_RTC_INT_FREQ) {
hpet_pie_limit = DEFAULT_RTC_INT_FREQ / freq;
} else {
- clc = (uint64_t) hpet_clockevent.mult * NSEC_PER_SEC;
+ struct clock_event_device *evt = &hpet_channel0.evt;
+
+ clc = (uint64_t) evt->mult * NSEC_PER_SEC;
do_div(clc, freq);
- clc >>= hpet_clockevent.shift;
+ clc >>= evt->shift;
hpet_pie_delta = clc;
hpet_pie_limit = 0;
}
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