[tip:x86/timers] x86/hpet: Consolidate clockevent functions

From: tip-bot for Thomas Gleixner
Date: Thu Jun 27 2019 - 19:52:10 EST

Commit-ID: 310b5b3eb6ba5d3a92d783b9fa1c5a3ffb5932e9
Gitweb: https://git.kernel.org/tip/310b5b3eb6ba5d3a92d783b9fa1c5a3ffb5932e9
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Sun, 23 Jun 2019 15:24:06 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 28 Jun 2019 00:57:26 +0200

x86/hpet: Consolidate clockevent functions

Now that the legacy clockevent is wrapped in a hpet_channel struct most
clockevent functions can be shared between the legacy and the MSI based
clockevents.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ricardo Neri <ricardo.neri-calderon@xxxxxxxxxxxxxxx>
Cc: Ashok Raj <ashok.raj@xxxxxxxxx>
Cc: Andi Kleen <andi.kleen@xxxxxxxxx>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Ravi Shankar <ravi.v.shankar@xxxxxxxxx>
Link: https://lkml.kernel.org/r/20190623132436.461437795@xxxxxxxxxxxxx

---
arch/x86/kernel/hpet.c | 92 ++++++++++++++------------------------------------
1 file changed, 25 insertions(+), 67 deletions(-)

diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 19e3ac81c3b9..47eb4d36864e 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -310,8 +310,9 @@ static void hpet_legacy_clockevent_register(struct hpet_channel *hc)
pr_debug("Clockevent registered\n");
}

-static int hpet_set_periodic(struct clock_event_device *evt, int channel)
+static int hpet_clkevt_set_state_periodic(struct clock_event_device *evt)
{
+ unsigned int channel = clockevent_to_channel(evt)->num;
unsigned int cfg, cmp, now;
uint64_t delta;

@@ -340,8 +341,9 @@ static int hpet_set_periodic(struct clock_event_device *evt, int channel)
return 0;
}

-static int hpet_set_oneshot(struct clock_event_device *evt, int channel)
+static int hpet_clkevt_set_state_oneshot(struct clock_event_device *evt)
{
+ unsigned int channel = clockevent_to_channel(evt)->num;
unsigned int cfg;

cfg = hpet_readl(HPET_Tn_CFG(channel));
@@ -352,8 +354,9 @@ static int hpet_set_oneshot(struct clock_event_device *evt, int channel)
return 0;
}

-static int hpet_shutdown(struct clock_event_device *evt, int channel)
+static int hpet_clkevt_set_state_shutdown(struct clock_event_device *evt)
{
+ unsigned int channel = clockevent_to_channel(evt)->num;
unsigned int cfg;

cfg = hpet_readl(HPET_Tn_CFG(channel));
@@ -363,15 +366,17 @@ static int hpet_shutdown(struct clock_event_device *evt, int channel)
return 0;
}

-static int hpet_resume(struct clock_event_device *evt)
+static int hpet_clkevt_legacy_resume(struct clock_event_device *evt)
{
hpet_enable_legacy_int();
hpet_print_config();
return 0;
}

-static int hpet_next_event(unsigned long delta, int channel)
+static int
+hpet_clkevt_set_next_event(unsigned long delta, struct clock_event_device *evt)
{
+ unsigned int channel = clockevent_to_channel(evt)->num;
u32 cnt;
s32 res;

@@ -406,32 +411,6 @@ static int hpet_next_event(unsigned long delta, int channel)
return res < HPET_MIN_CYCLES ? -ETIME : 0;
}

-static int hpet_legacy_shutdown(struct clock_event_device *evt)
-{
- return hpet_shutdown(evt, 0);
-}
-
-static int hpet_legacy_set_oneshot(struct clock_event_device *evt)
-{
- return hpet_set_oneshot(evt, 0);
-}
-
-static int hpet_legacy_set_periodic(struct clock_event_device *evt)
-{
- return hpet_set_periodic(evt, 0);
-}
-
-static int hpet_legacy_resume(struct clock_event_device *evt)
-{
- return hpet_resume(evt);
-}
-
-static int hpet_legacy_next_event(unsigned long delta,
- struct clock_event_device *evt)
-{
- return hpet_next_event(delta, 0);
-}
-
/*
* The HPET clock event device wrapped in a channel for conversion
*/
@@ -440,11 +419,11 @@ static struct hpet_channel hpet_channel0 = {
.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,
+ .set_state_periodic = hpet_clkevt_set_state_periodic,
+ .set_state_oneshot = hpet_clkevt_set_state_oneshot,
+ .set_state_shutdown = hpet_clkevt_set_state_shutdown,
+ .tick_resume = hpet_clkevt_legacy_resume,
+ .set_next_event = hpet_clkevt_set_next_event,
.irq = 0,
.rating = 50,
}
@@ -481,22 +460,7 @@ void hpet_msi_write(struct hpet_channel *hc, struct msi_msg *msg)
hpet_writel(msg->address_lo, HPET_Tn_ROUTE(hc->num) + 4);
}

-static int hpet_msi_shutdown(struct clock_event_device *evt)
-{
- return hpet_shutdown(evt, clockevent_to_channel(evt)->num);
-}
-
-static int hpet_msi_set_oneshot(struct clock_event_device *evt)
-{
- return hpet_set_oneshot(evt, clockevent_to_channel(evt)->num);
-}
-
-static int hpet_msi_set_periodic(struct clock_event_device *evt)
-{
- return hpet_set_periodic(evt, clockevent_to_channel(evt)->num);
-}
-
-static int hpet_msi_resume(struct clock_event_device *evt)
+static int hpet_clkevt_msi_resume(struct clock_event_device *evt)
{
struct hpet_channel *hc = clockevent_to_channel(evt);
struct irq_data *data = irq_get_irq_data(hc->irq);
@@ -509,13 +473,7 @@ static int hpet_msi_resume(struct clock_event_device *evt)
return 0;
}

-static int hpet_msi_next_event(unsigned long delta,
- struct clock_event_device *evt)
-{
- return hpet_next_event(delta, clockevent_to_channel(evt)->num);
-}
-
-static irqreturn_t hpet_interrupt_handler(int irq, void *data)
+static irqreturn_t hpet_msi_interrupt_handler(int irq, void *data)
{
struct hpet_channel *hc = data;
struct clock_event_device *evt = &hc->evt;
@@ -529,9 +487,9 @@ static irqreturn_t hpet_interrupt_handler(int irq, void *data)
return IRQ_HANDLED;
}

-static int hpet_setup_irq(struct hpet_channel *hc)
+static int hpet_setup_msi_irq(struct hpet_channel *hc)
{
- if (request_irq(hc->irq, hpet_interrupt_handler,
+ if (request_irq(hc->irq, hpet_msi_interrupt_handler,
IRQF_TIMER | IRQF_NOBALANCING,
hc->name, hc))
return -1;
@@ -553,20 +511,20 @@ static void init_one_hpet_msi_clockevent(struct hpet_channel *hc, int cpu)
hc->cpu = cpu;
per_cpu(cpu_hpet_channel, cpu) = hc;
evt->name = hc->name;
- hpet_setup_irq(hc);
+ hpet_setup_msi_irq(hc);
evt->irq = hc->irq;

evt->rating = 110;
evt->features = CLOCK_EVT_FEAT_ONESHOT;
if (hc->boot_cfg & HPET_TN_PERIODIC) {
evt->features |= CLOCK_EVT_FEAT_PERIODIC;
- evt->set_state_periodic = hpet_msi_set_periodic;
+ evt->set_state_periodic = hpet_clkevt_set_state_periodic;
}

- evt->set_state_shutdown = hpet_msi_shutdown;
- evt->set_state_oneshot = hpet_msi_set_oneshot;
- evt->tick_resume = hpet_msi_resume;
- evt->set_next_event = hpet_msi_next_event;
+ evt->set_state_shutdown = hpet_clkevt_set_state_shutdown;
+ evt->set_state_oneshot = hpet_clkevt_set_state_oneshot;
+ evt->set_next_event = hpet_clkevt_set_next_event;
+ evt->tick_resume = hpet_clkevt_msi_resume;
evt->cpumask = cpumask_of(hc->cpu);

clockevents_config_and_register(evt, hpet_freq, HPET_MIN_PROG_DELTA,