* [Qemu-devel] [PATCH v14 1/3] hw/ptimer: Support running with counter = 0 by introducing new policy feature
2016-06-17 13:17 [Qemu-devel] [PATCH v14 0/3] PTimer fixes/features and ARM MPTimer conversion Dmitry Osipenko
@ 2016-06-17 13:17 ` Dmitry Osipenko
2016-06-23 13:49 ` Peter Maydell
2016-06-17 13:17 ` [Qemu-devel] [PATCH v14 2/3] hw/ptimer: Fix counter - 1 returned by ptimer_get_count for the active timer Dmitry Osipenko
2016-06-17 13:17 ` [Qemu-devel] [PATCH v14 3/3] arm_mptimer: Convert to use ptimer Dmitry Osipenko
2 siblings, 1 reply; 9+ messages in thread
From: Dmitry Osipenko @ 2016-06-17 13:17 UTC (permalink / raw)
To: QEMU Developers, qemu-arm; +Cc: Peter Crosthwaite, Peter Maydell
Currently ptimer prints error message and stops the running timer that has
delta (counter) = 0, this is an incorrect behaviour for some of the ptimer
users. There are different variants of how particular timer could handle that
case besides stopping the timer, like immediate or deferred IRQ trigger.
Introduce policy feature that provides ptimer with an information about the
correct behaviour.
Implement the "counter = 0 triggers IRQ after one period" policy, as it is
known to be used by the ARM MPTimer and set "default" policy to all ptimer
users, maintaining old behaviour till they get fixed.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
hw/arm/musicpal.c | 2 +-
hw/core/ptimer.c | 45 +++++++++++++++++++++++---------------------
hw/dma/xilinx_axidma.c | 2 +-
hw/m68k/mcf5206.c | 2 +-
hw/m68k/mcf5208.c | 2 +-
hw/net/fsl_etsec/etsec.c | 2 +-
hw/net/lan9118.c | 2 +-
hw/timer/allwinner-a10-pit.c | 2 +-
hw/timer/arm_timer.c | 2 +-
hw/timer/aspeed_timer.c | 2 +-
hw/timer/digic-timer.c | 2 +-
hw/timer/etraxfs_timer.c | 6 +++---
hw/timer/exynos4210_mct.c | 7 ++++---
hw/timer/exynos4210_pwm.c | 2 +-
hw/timer/exynos4210_rtc.c | 4 ++--
hw/timer/grlib_gptimer.c | 2 +-
hw/timer/imx_epit.c | 4 ++--
hw/timer/imx_gpt.c | 2 +-
hw/timer/lm32_timer.c | 2 +-
hw/timer/milkymist-sysctl.c | 4 ++--
hw/timer/puv3_ost.c | 2 +-
hw/timer/sh_timer.c | 2 +-
hw/timer/slavio_timer.c | 2 +-
hw/timer/xilinx_timer.c | 2 +-
include/hw/ptimer.h | 7 ++++++-
25 files changed, 61 insertions(+), 52 deletions(-)
diff --git a/hw/arm/musicpal.c b/hw/arm/musicpal.c
index 7a4cc07..087696a 100644
--- a/hw/arm/musicpal.c
+++ b/hw/arm/musicpal.c
@@ -837,7 +837,7 @@ static void mv88w8618_timer_init(SysBusDevice *dev, mv88w8618_timer_state *s,
s->freq = freq;
bh = qemu_bh_new(mv88w8618_timer_tick, s);
- s->ptimer = ptimer_init(bh);
+ s->ptimer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
}
static uint64_t mv88w8618_pit_read(void *opaque, hwaddr offset,
diff --git a/hw/core/ptimer.c b/hw/core/ptimer.c
index 05b0c27..289e23e 100644
--- a/hw/core/ptimer.c
+++ b/hw/core/ptimer.c
@@ -21,6 +21,7 @@ struct ptimer_state
int64_t period;
int64_t last_event;
int64_t next_event;
+ uint8_t policy_mask;
QEMUBH *bh;
QEMUTimer *timer;
};
@@ -35,14 +36,15 @@ static void ptimer_trigger(ptimer_state *s)
static void ptimer_reload(ptimer_state *s)
{
- uint32_t period_frac = s->period_frac;
+ int64_t period_frac = s->period_frac;
uint64_t period = s->period;
+ uint64_t delta = s->delta;
- if (s->delta == 0) {
- ptimer_trigger(s);
- s->delta = s->limit;
+ if (delta == 0 && (s->policy_mask & PTIMER_POLICY_CNT_0_DEFERRED_TRIG)) {
+ delta = 1;
}
- if (s->delta == 0 || s->period == 0) {
+
+ if (delta == 0 || period == 0) {
fprintf(stderr, "Timer with period zero, disabling\n");
s->enabled = 0;
return;
@@ -57,15 +59,15 @@ static void ptimer_reload(ptimer_state *s)
* on the current generation of host machines.
*/
- if (s->enabled == 1 && (s->delta * period < 10000) && !use_icount) {
- period = 10000 / s->delta;
+ if (s->enabled == 1 && (delta * period < 10000) && !use_icount) {
+ period = 10000 / delta;
period_frac = 0;
}
s->last_event = s->next_event;
- s->next_event = s->last_event + s->delta * period;
+ s->next_event = s->last_event + delta * period;
if (period_frac) {
- s->next_event += ((int64_t)period_frac * s->delta) >> 32;
+ s->next_event += (period_frac * delta) >> 32;
}
timer_mod(s->timer, s->next_event);
}
@@ -73,27 +75,30 @@ static void ptimer_reload(ptimer_state *s)
static void ptimer_tick(void *opaque)
{
ptimer_state *s = (ptimer_state *)opaque;
- ptimer_trigger(s);
- s->delta = 0;
- if (s->enabled == 2) {
+
+ s->delta = (s->enabled == 1) ? s->limit : 0;
+
+ if (s->delta == 0) {
s->enabled = 0;
} else {
ptimer_reload(s);
}
+
+ ptimer_trigger(s);
}
uint64_t ptimer_get_count(ptimer_state *s)
{
uint64_t counter;
- if (s->enabled) {
+ if (s->enabled && s->delta != 0) {
int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
int64_t next = s->next_event;
bool expired = (now - next >= 0);
bool oneshot = (s->enabled == 2);
/* Figure out the current counter value. */
- if (s->period == 0 || (expired && (oneshot || use_icount))) {
+ if (expired && (oneshot || use_icount)) {
/* Prevent timer underflowing if it should already have
triggered. */
counter = 0;
@@ -165,10 +170,6 @@ void ptimer_run(ptimer_state *s, int oneshot)
{
bool was_disabled = !s->enabled;
- if (was_disabled && s->period == 0) {
- fprintf(stderr, "Timer with period zero, disabling\n");
- return;
- }
s->enabled = oneshot ? 2 : 1;
if (was_disabled) {
s->next_event = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
@@ -203,6 +204,7 @@ void ptimer_set_period(ptimer_state *s, int64_t period)
/* Set counter frequency in Hz. */
void ptimer_set_freq(ptimer_state *s, uint32_t freq)
{
+ g_assert(freq != 0 && freq <= 1000000000ll);
s->delta = ptimer_get_count(s);
s->period = 1000000000ll / freq;
s->period_frac = (1000000000ll << 32) / freq;
@@ -232,8 +234,8 @@ uint64_t ptimer_get_limit(ptimer_state *s)
const VMStateDescription vmstate_ptimer = {
.name = "ptimer",
- .version_id = 1,
- .minimum_version_id = 1,
+ .version_id = 2,
+ .minimum_version_id = 2,
.fields = (VMStateField[]) {
VMSTATE_UINT8(enabled, ptimer_state),
VMSTATE_UINT64(limit, ptimer_state),
@@ -247,12 +249,13 @@ const VMStateDescription vmstate_ptimer = {
}
};
-ptimer_state *ptimer_init(QEMUBH *bh)
+ptimer_state *ptimer_init(QEMUBH *bh, uint8_t policy_mask)
{
ptimer_state *s;
s = (ptimer_state *)g_malloc0(sizeof(ptimer_state));
s->bh = bh;
s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, ptimer_tick, s);
+ s->policy_mask = policy_mask;
return s;
}
diff --git a/hw/dma/xilinx_axidma.c b/hw/dma/xilinx_axidma.c
index a4753e5..b135a5f 100644
--- a/hw/dma/xilinx_axidma.c
+++ b/hw/dma/xilinx_axidma.c
@@ -548,7 +548,7 @@ static void xilinx_axidma_realize(DeviceState *dev, Error **errp)
st->nr = i;
st->bh = qemu_bh_new(timer_hit, st);
- st->ptimer = ptimer_init(st->bh);
+ st->ptimer = ptimer_init(st->bh, PTIMER_POLICY_DEFAULT);
ptimer_set_freq(st->ptimer, s->freqhz);
}
return;
diff --git a/hw/m68k/mcf5206.c b/hw/m68k/mcf5206.c
index e14896e..b81901f 100644
--- a/hw/m68k/mcf5206.c
+++ b/hw/m68k/mcf5206.c
@@ -139,7 +139,7 @@ static m5206_timer_state *m5206_timer_init(qemu_irq irq)
s = (m5206_timer_state *)g_malloc0(sizeof(m5206_timer_state));
bh = qemu_bh_new(m5206_timer_trigger, s);
- s->timer = ptimer_init(bh);
+ s->timer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
s->irq = irq;
m5206_timer_reset(s);
return s;
diff --git a/hw/m68k/mcf5208.c b/hw/m68k/mcf5208.c
index 2415557..9240ebf 100644
--- a/hw/m68k/mcf5208.c
+++ b/hw/m68k/mcf5208.c
@@ -183,7 +183,7 @@ static void mcf5208_sys_init(MemoryRegion *address_space, qemu_irq *pic)
for (i = 0; i < 2; i++) {
s = (m5208_timer_state *)g_malloc0(sizeof(m5208_timer_state));
bh = qemu_bh_new(m5208_timer_trigger, s);
- s->timer = ptimer_init(bh);
+ s->timer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
memory_region_init_io(&s->iomem, NULL, &m5208_timer_ops, s,
"m5208-timer", 0x00004000);
memory_region_add_subregion(address_space, 0xfc080000 + 0x4000 * i,
diff --git a/hw/net/fsl_etsec/etsec.c b/hw/net/fsl_etsec/etsec.c
index 98250e0..8f640b0 100644
--- a/hw/net/fsl_etsec/etsec.c
+++ b/hw/net/fsl_etsec/etsec.c
@@ -387,7 +387,7 @@ static void etsec_realize(DeviceState *dev, Error **errp)
etsec->bh = qemu_bh_new(etsec_timer_hit, etsec);
- etsec->ptimer = ptimer_init(etsec->bh);
+ etsec->ptimer = ptimer_init(etsec->bh, PTIMER_POLICY_DEFAULT);
ptimer_set_freq(etsec->ptimer, 100);
}
diff --git a/hw/net/lan9118.c b/hw/net/lan9118.c
index 2052073..650a6c7 100644
--- a/hw/net/lan9118.c
+++ b/hw/net/lan9118.c
@@ -1345,7 +1345,7 @@ static int lan9118_init1(SysBusDevice *sbd)
s->txp = &s->tx_packet;
bh = qemu_bh_new(lan9118_tick, s);
- s->timer = ptimer_init(bh);
+ s->timer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
ptimer_set_freq(s->timer, 10000);
ptimer_set_limit(s->timer, 0xffff, 1);
diff --git a/hw/timer/allwinner-a10-pit.c b/hw/timer/allwinner-a10-pit.c
index 3385e5d..22ceabe 100644
--- a/hw/timer/allwinner-a10-pit.c
+++ b/hw/timer/allwinner-a10-pit.c
@@ -267,7 +267,7 @@ static void a10_pit_init(Object *obj)
tc->container = s;
tc->index = i;
bh[i] = qemu_bh_new(a10_pit_timer_cb, tc);
- s->timer[i] = ptimer_init(bh[i]);
+ s->timer[i] = ptimer_init(bh[i], PTIMER_POLICY_DEFAULT);
}
}
diff --git a/hw/timer/arm_timer.c b/hw/timer/arm_timer.c
index 111a16d..98fddd7 100644
--- a/hw/timer/arm_timer.c
+++ b/hw/timer/arm_timer.c
@@ -171,7 +171,7 @@ static arm_timer_state *arm_timer_init(uint32_t freq)
s->control = TIMER_CTRL_IE;
bh = qemu_bh_new(arm_timer_tick, s);
- s->timer = ptimer_init(bh);
+ s->timer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
vmstate_register(NULL, -1, &vmstate_arm_timer, s);
return s;
}
diff --git a/hw/timer/aspeed_timer.c b/hw/timer/aspeed_timer.c
index 4b94808..f48799d 100644
--- a/hw/timer/aspeed_timer.c
+++ b/hw/timer/aspeed_timer.c
@@ -356,7 +356,7 @@ static void aspeed_init_one_timer(AspeedTimerCtrlState *s, uint8_t id)
t->id = id;
bh = qemu_bh_new(aspeed_timer_expire, t);
- t->timer = ptimer_init(bh);
+ t->timer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
}
static void aspeed_timer_realize(DeviceState *dev, Error **errp)
diff --git a/hw/timer/digic-timer.c b/hw/timer/digic-timer.c
index 0f21faf..e1fcf73 100644
--- a/hw/timer/digic-timer.c
+++ b/hw/timer/digic-timer.c
@@ -127,7 +127,7 @@ static void digic_timer_init(Object *obj)
{
DigicTimerState *s = DIGIC_TIMER(obj);
- s->ptimer = ptimer_init(NULL);
+ s->ptimer = ptimer_init(NULL, PTIMER_POLICY_DEFAULT);
/*
* FIXME: there is no documentation on Digic timer
diff --git a/hw/timer/etraxfs_timer.c b/hw/timer/etraxfs_timer.c
index 36d8f46..8e18236 100644
--- a/hw/timer/etraxfs_timer.c
+++ b/hw/timer/etraxfs_timer.c
@@ -322,9 +322,9 @@ static int etraxfs_timer_init(SysBusDevice *dev)
t->bh_t0 = qemu_bh_new(timer0_hit, t);
t->bh_t1 = qemu_bh_new(timer1_hit, t);
t->bh_wd = qemu_bh_new(watchdog_hit, t);
- t->ptimer_t0 = ptimer_init(t->bh_t0);
- t->ptimer_t1 = ptimer_init(t->bh_t1);
- t->ptimer_wd = ptimer_init(t->bh_wd);
+ t->ptimer_t0 = ptimer_init(t->bh_t0, PTIMER_POLICY_DEFAULT);
+ t->ptimer_t1 = ptimer_init(t->bh_t1, PTIMER_POLICY_DEFAULT);
+ t->ptimer_wd = ptimer_init(t->bh_wd, PTIMER_POLICY_DEFAULT);
sysbus_init_irq(dev, &t->irq);
sysbus_init_irq(dev, &t->nmi);
diff --git a/hw/timer/exynos4210_mct.c b/hw/timer/exynos4210_mct.c
index ae69345..0c18934 100644
--- a/hw/timer/exynos4210_mct.c
+++ b/hw/timer/exynos4210_mct.c
@@ -1431,15 +1431,16 @@ static void exynos4210_mct_init(Object *obj)
/* Global timer */
bh[0] = qemu_bh_new(exynos4210_gfrc_event, s);
- s->g_timer.ptimer_frc = ptimer_init(bh[0]);
+ s->g_timer.ptimer_frc = ptimer_init(bh[0], PTIMER_POLICY_DEFAULT);
memset(&s->g_timer.reg, 0, sizeof(struct gregs));
/* Local timers */
for (i = 0; i < 2; i++) {
bh[0] = qemu_bh_new(exynos4210_ltick_event, &s->l_timer[i]);
bh[1] = qemu_bh_new(exynos4210_lfrc_event, &s->l_timer[i]);
- s->l_timer[i].tick_timer.ptimer_tick = ptimer_init(bh[0]);
- s->l_timer[i].ptimer_frc = ptimer_init(bh[1]);
+ s->l_timer[i].tick_timer.ptimer_tick =
+ ptimer_init(bh[0], PTIMER_POLICY_DEFAULT);
+ s->l_timer[i].ptimer_frc = ptimer_init(bh[1], PTIMER_POLICY_DEFAULT);
s->l_timer[i].id = i;
}
diff --git a/hw/timer/exynos4210_pwm.c b/hw/timer/exynos4210_pwm.c
index 0e9e2e9..f576507 100644
--- a/hw/timer/exynos4210_pwm.c
+++ b/hw/timer/exynos4210_pwm.c
@@ -390,7 +390,7 @@ static void exynos4210_pwm_init(Object *obj)
for (i = 0; i < EXYNOS4210_PWM_TIMERS_NUM; i++) {
bh = qemu_bh_new(exynos4210_pwm_tick, &s->timer[i]);
sysbus_init_irq(dev, &s->timer[i].irq);
- s->timer[i].ptimer = ptimer_init(bh);
+ s->timer[i].ptimer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
s->timer[i].id = i;
s->timer[i].parent = s;
}
diff --git a/hw/timer/exynos4210_rtc.c b/hw/timer/exynos4210_rtc.c
index da4dd45..1a648c5 100644
--- a/hw/timer/exynos4210_rtc.c
+++ b/hw/timer/exynos4210_rtc.c
@@ -555,12 +555,12 @@ static void exynos4210_rtc_init(Object *obj)
QEMUBH *bh;
bh = qemu_bh_new(exynos4210_rtc_tick, s);
- s->ptimer = ptimer_init(bh);
+ s->ptimer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
ptimer_set_freq(s->ptimer, RTC_BASE_FREQ);
exynos4210_rtc_update_freq(s, 0);
bh = qemu_bh_new(exynos4210_rtc_1Hz_tick, s);
- s->ptimer_1Hz = ptimer_init(bh);
+ s->ptimer_1Hz = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
ptimer_set_freq(s->ptimer_1Hz, RTC_BASE_FREQ);
sysbus_init_irq(dev, &s->alm_irq);
diff --git a/hw/timer/grlib_gptimer.c b/hw/timer/grlib_gptimer.c
index dd000f5..712d1ae 100644
--- a/hw/timer/grlib_gptimer.c
+++ b/hw/timer/grlib_gptimer.c
@@ -363,7 +363,7 @@ static int grlib_gptimer_init(SysBusDevice *dev)
timer->unit = unit;
timer->bh = qemu_bh_new(grlib_gptimer_hit, timer);
- timer->ptimer = ptimer_init(timer->bh);
+ timer->ptimer = ptimer_init(timer->bh, PTIMER_POLICY_DEFAULT);
timer->id = i;
/* One IRQ line for each timer */
diff --git a/hw/timer/imx_epit.c b/hw/timer/imx_epit.c
index eddf348..f34d7f7 100644
--- a/hw/timer/imx_epit.c
+++ b/hw/timer/imx_epit.c
@@ -314,10 +314,10 @@ static void imx_epit_realize(DeviceState *dev, Error **errp)
0x00001000);
sysbus_init_mmio(sbd, &s->iomem);
- s->timer_reload = ptimer_init(NULL);
+ s->timer_reload = ptimer_init(NULL, PTIMER_POLICY_DEFAULT);
bh = qemu_bh_new(imx_epit_cmp, s);
- s->timer_cmp = ptimer_init(bh);
+ s->timer_cmp = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
}
static void imx_epit_class_init(ObjectClass *klass, void *data)
diff --git a/hw/timer/imx_gpt.c b/hw/timer/imx_gpt.c
index 3c2f01a..b864ac3 100644
--- a/hw/timer/imx_gpt.c
+++ b/hw/timer/imx_gpt.c
@@ -440,7 +440,7 @@ static void imx_gpt_realize(DeviceState *dev, Error **errp)
sysbus_init_mmio(sbd, &s->iomem);
bh = qemu_bh_new(imx_gpt_timeout, s);
- s->timer = ptimer_init(bh);
+ s->timer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
}
static void imx_gpt_class_init(ObjectClass *klass, void *data)
diff --git a/hw/timer/lm32_timer.c b/hw/timer/lm32_timer.c
index 3198355..a7a6b57 100644
--- a/hw/timer/lm32_timer.c
+++ b/hw/timer/lm32_timer.c
@@ -183,7 +183,7 @@ static int lm32_timer_init(SysBusDevice *dev)
sysbus_init_irq(dev, &s->irq);
s->bh = qemu_bh_new(timer_hit, s);
- s->ptimer = ptimer_init(s->bh);
+ s->ptimer = ptimer_init(s->bh, PTIMER_POLICY_DEFAULT);
ptimer_set_freq(s->ptimer, s->freq_hz);
memory_region_init_io(&s->iomem, OBJECT(s), &timer_ops, s,
diff --git a/hw/timer/milkymist-sysctl.c b/hw/timer/milkymist-sysctl.c
index 5f29480..818f2d9 100644
--- a/hw/timer/milkymist-sysctl.c
+++ b/hw/timer/milkymist-sysctl.c
@@ -280,8 +280,8 @@ static int milkymist_sysctl_init(SysBusDevice *dev)
s->bh0 = qemu_bh_new(timer0_hit, s);
s->bh1 = qemu_bh_new(timer1_hit, s);
- s->ptimer0 = ptimer_init(s->bh0);
- s->ptimer1 = ptimer_init(s->bh1);
+ s->ptimer0 = ptimer_init(s->bh0, PTIMER_POLICY_DEFAULT);
+ s->ptimer1 = ptimer_init(s->bh1, PTIMER_POLICY_DEFAULT);
ptimer_set_freq(s->ptimer0, s->freq_hz);
ptimer_set_freq(s->ptimer1, s->freq_hz);
diff --git a/hw/timer/puv3_ost.c b/hw/timer/puv3_ost.c
index 93650b7..0b3d717 100644
--- a/hw/timer/puv3_ost.c
+++ b/hw/timer/puv3_ost.c
@@ -125,7 +125,7 @@ static int puv3_ost_init(SysBusDevice *dev)
sysbus_init_irq(dev, &s->irq);
s->bh = qemu_bh_new(puv3_ost_tick, s);
- s->ptimer = ptimer_init(s->bh);
+ s->ptimer = ptimer_init(s->bh, PTIMER_POLICY_DEFAULT);
ptimer_set_freq(s->ptimer, 50 * 1000 * 1000);
memory_region_init_io(&s->iomem, OBJECT(s), &puv3_ost_ops, s, "puv3_ost",
diff --git a/hw/timer/sh_timer.c b/hw/timer/sh_timer.c
index 255b2fc..9afb2d0 100644
--- a/hw/timer/sh_timer.c
+++ b/hw/timer/sh_timer.c
@@ -203,7 +203,7 @@ static void *sh_timer_init(uint32_t freq, int feat, qemu_irq irq)
s->irq = irq;
bh = qemu_bh_new(sh_timer_tick, s);
- s->timer = ptimer_init(bh);
+ s->timer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
sh_timer_write(s, OFFSET_TCOR >> 2, s->tcor);
sh_timer_write(s, OFFSET_TCNT >> 2, s->tcnt);
diff --git a/hw/timer/slavio_timer.c b/hw/timer/slavio_timer.c
index fb3e08b..bfee1f3 100644
--- a/hw/timer/slavio_timer.c
+++ b/hw/timer/slavio_timer.c
@@ -389,7 +389,7 @@ static int slavio_timer_init1(SysBusDevice *dev)
tc->timer_index = i;
bh = qemu_bh_new(slavio_timer_irq, tc);
- s->cputimer[i].timer = ptimer_init(bh);
+ s->cputimer[i].timer = ptimer_init(bh, PTIMER_POLICY_DEFAULT);
ptimer_set_period(s->cputimer[i].timer, TIMER_PERIOD);
size = i == 0 ? SYS_TIMER_SIZE : CPU_TIMER_SIZE;
diff --git a/hw/timer/xilinx_timer.c b/hw/timer/xilinx_timer.c
index 2ea970d..59439c0 100644
--- a/hw/timer/xilinx_timer.c
+++ b/hw/timer/xilinx_timer.c
@@ -218,7 +218,7 @@ static void xilinx_timer_realize(DeviceState *dev, Error **errp)
xt->parent = t;
xt->nr = i;
xt->bh = qemu_bh_new(timer_hit, xt);
- xt->ptimer = ptimer_init(xt->bh);
+ xt->ptimer = ptimer_init(xt->bh, PTIMER_POLICY_DEFAULT);
ptimer_set_freq(xt->ptimer, t->freq_hz);
}
diff --git a/include/hw/ptimer.h b/include/hw/ptimer.h
index e397db5..69dbdc1 100644
--- a/include/hw/ptimer.h
+++ b/include/hw/ptimer.h
@@ -12,11 +12,16 @@
#include "qemu/timer.h"
#include "migration/vmstate.h"
+/* Stop the timer if period/counter is equal to 0. */
+#define PTIMER_POLICY_DEFAULT 0
+/* Counter = 0 triggers IRQ after one period. */
+#define PTIMER_POLICY_CNT_0_DEFERRED_TRIG (1 << 0)
+
/* ptimer.c */
typedef struct ptimer_state ptimer_state;
typedef void (*ptimer_cb)(void *opaque);
-ptimer_state *ptimer_init(QEMUBH *bh);
+ptimer_state *ptimer_init(QEMUBH *bh, uint8_t policy_mask);
void ptimer_set_period(ptimer_state *s, int64_t period);
void ptimer_set_freq(ptimer_state *s, uint32_t freq);
uint64_t ptimer_get_limit(ptimer_state *s);
--
2.9.0
^ permalink raw reply related [flat|nested] 9+ messages in thread* [Qemu-devel] [PATCH v14 3/3] arm_mptimer: Convert to use ptimer
2016-06-17 13:17 [Qemu-devel] [PATCH v14 0/3] PTimer fixes/features and ARM MPTimer conversion Dmitry Osipenko
2016-06-17 13:17 ` [Qemu-devel] [PATCH v14 1/3] hw/ptimer: Support running with counter = 0 by introducing new policy feature Dmitry Osipenko
2016-06-17 13:17 ` [Qemu-devel] [PATCH v14 2/3] hw/ptimer: Fix counter - 1 returned by ptimer_get_count for the active timer Dmitry Osipenko
@ 2016-06-17 13:17 ` Dmitry Osipenko
2 siblings, 0 replies; 9+ messages in thread
From: Dmitry Osipenko @ 2016-06-17 13:17 UTC (permalink / raw)
To: QEMU Developers, qemu-arm; +Cc: Peter Crosthwaite, Peter Maydell
Current ARM MPTimer implementation uses QEMUTimer for the actual timer,
this implementation isn't complete and mostly tries to duplicate of what
generic ptimer is already doing fine.
Conversion to ptimer brings the following benefits and fixes:
- Simple timer pausing implementation
- Fixes counter value preservation after stopping the timer
- Properly handles prescaler != 0 / counter = 0 / load = 0 cases
- Code simplification and reduction
Bump VMSD to version 3, since VMState is changed and is not compatible
with the previous implementation.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
---
hw/timer/arm_mptimer.c | 133 +++++++++++++++++++++--------------------
include/hw/timer/arm_mptimer.h | 5 +-
2 files changed, 70 insertions(+), 68 deletions(-)
diff --git a/hw/timer/arm_mptimer.c b/hw/timer/arm_mptimer.c
index d66bbf0..3616c40 100644
--- a/hw/timer/arm_mptimer.c
+++ b/hw/timer/arm_mptimer.c
@@ -20,9 +20,10 @@
*/
#include "qemu/osdep.h"
+#include "hw/ptimer.h"
#include "hw/timer/arm_mptimer.h"
#include "qapi/error.h"
-#include "qemu/timer.h"
+#include "qemu/main-loop.h"
#include "qom/cpu.h"
/* This device implements the per-cpu private timer and watchdog block
@@ -44,55 +45,54 @@ static inline void timerblock_update_irq(TimerBlock *tb)
}
/* Return conversion factor from mpcore timer ticks to qemu timer ticks. */
-static inline uint32_t timerblock_scale(TimerBlock *tb)
+static inline uint32_t timerblock_scale(uint32_t control)
{
- return (((tb->control >> 8) & 0xff) + 1) * 10;
+ return (((control >> 8) & 0xff) + 1) * 10;
}
-static void timerblock_reload(TimerBlock *tb, int restart)
+static inline void timerblock_set_count(struct ptimer_state *timer,
+ uint32_t control, uint64_t *count)
{
- if (tb->count == 0) {
- return;
+ /* PTimer would immediately trigger interrupt for periodic timer
+ * when counter set to 0, MPtimer under certain condition only.
+ */
+ if ((control & 3) == 3 && (control & 0xff00) == 0 && *count == 0) {
+ *count = ptimer_get_limit(timer);
}
- if (restart) {
- tb->tick = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+ ptimer_set_count(timer, *count);
+}
+
+static inline void timerblock_run(struct ptimer_state *timer,
+ uint32_t control, uint32_t load)
+{
+ if ((control & 1) && ((control & 0xff00) || load != 0)) {
+ ptimer_run(timer, !(control & 2));
}
- tb->tick += (int64_t)tb->count * timerblock_scale(tb);
- timer_mod(tb->timer, tb->tick);
}
static void timerblock_tick(void *opaque)
{
TimerBlock *tb = (TimerBlock *)opaque;
tb->status = 1;
- if (tb->control & 2) {
- tb->count = tb->load;
- timerblock_reload(tb, 0);
- } else {
- tb->count = 0;
- }
timerblock_update_irq(tb);
+ /* Periodic timer with load = 0 and prescaler != 0 would re-trigger
+ * IRQ after one period, otherwise it either stops or wraps around.
+ */
+ if ((tb->control & 2) && (tb->control & 0xff00) &&
+ ptimer_get_limit(tb->timer) == 0) {
+ ptimer_run(tb->timer, 0);
+ }
}
static uint64_t timerblock_read(void *opaque, hwaddr addr,
unsigned size)
{
TimerBlock *tb = (TimerBlock *)opaque;
- int64_t val;
switch (addr) {
case 0: /* Load */
- return tb->load;
+ return ptimer_get_limit(tb->timer);
case 4: /* Counter. */
- if (((tb->control & 1) == 0) || (tb->count == 0)) {
- return 0;
- }
- /* Slow and ugly, but hopefully won't happen too often. */
- val = tb->tick - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
- val /= timerblock_scale(tb);
- if (val < 0) {
- val = 0;
- }
- return val;
+ return ptimer_get_count(tb->timer);
case 8: /* Control. */
return tb->control;
case 12: /* Interrupt status. */
@@ -106,37 +106,45 @@ static void timerblock_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
TimerBlock *tb = (TimerBlock *)opaque;
- int64_t old;
+ uint32_t control = tb->control;
switch (addr) {
case 0: /* Load */
- tb->load = value;
- /* Fall through. */
- case 4: /* Counter. */
- if ((tb->control & 1) && tb->count) {
- /* Cancel the previous timer. */
- timer_del(tb->timer);
+ /* Setting load to 0 stops the timer without doing the tick if
+ * prescaler = 0.
+ */
+ if ((control & 1) && (control & 0xff00) == 0 && value == 0) {
+ ptimer_stop(tb->timer);
}
- tb->count = value;
- if (tb->control & 1) {
- timerblock_reload(tb, 1);
+ ptimer_set_limit(tb->timer, value, 1);
+ timerblock_run(tb->timer, control, value);
+ break;
+ case 4: /* Counter. */
+ /* Setting counter to 0 stops the one-shot timer, or periodic with
+ * load == 0, without doing the tick if prescaler = 0.
+ */
+ if ((control & 1) && (control & 0xff00) == 0 && value == 0 &&
+ (!(control & 2) || ptimer_get_limit(tb->timer) == 0)) {
+ ptimer_stop(tb->timer);
}
+ timerblock_set_count(tb->timer, control, &value);
+ timerblock_run(tb->timer, control, value);
break;
case 8: /* Control. */
- old = tb->control;
- tb->control = value;
+ if ((control & 1) && !(value & 1)) {
+ ptimer_stop(tb->timer);
+ }
+ if ((control & 0xff00) != (value & 0xff00)) {
+ ptimer_set_period(tb->timer, timerblock_scale(value));
+ }
if (value & 1) {
- if ((old & 1) && (tb->count != 0)) {
- /* Do nothing if timer is ticking right now. */
- break;
+ uint64_t count = ptimer_get_count(tb->timer);
+ /* Re-load periodic timer counter if needed. */
+ if ((value & 2) && count == 0) {
+ timerblock_set_count(tb->timer, value, &count);
}
- if (tb->control & 2) {
- tb->count = tb->load;
- }
- timerblock_reload(tb, 1);
- } else if (old & 1) {
- /* Shutdown the timer. */
- timer_del(tb->timer);
+ timerblock_run(tb->timer, value, count);
}
+ tb->control = value;
break;
case 12: /* Interrupt status. */
tb->status &= ~value;
@@ -186,13 +194,12 @@ static const MemoryRegionOps timerblock_ops = {
static void timerblock_reset(TimerBlock *tb)
{
- tb->count = 0;
- tb->load = 0;
tb->control = 0;
tb->status = 0;
- tb->tick = 0;
if (tb->timer) {
- timer_del(tb->timer);
+ ptimer_stop(tb->timer);
+ ptimer_set_limit(tb->timer, 0, 1);
+ ptimer_set_period(tb->timer, timerblock_scale(0));
}
}
@@ -238,7 +245,8 @@ static void arm_mptimer_realize(DeviceState *dev, Error **errp)
*/
for (i = 0; i < s->num_cpu; i++) {
TimerBlock *tb = &s->timerblock[i];
- tb->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, timerblock_tick, tb);
+ QEMUBH *bh = qemu_bh_new(timerblock_tick, tb);
+ tb->timer = ptimer_init(bh, PTIMER_POLICY_CNT_0_DEFERRED_TRIG);
sysbus_init_irq(sbd, &tb->irq);
memory_region_init_io(&tb->iomem, OBJECT(s), &timerblock_ops, tb,
"arm_mptimer_timerblock", 0x20);
@@ -248,26 +256,23 @@ static void arm_mptimer_realize(DeviceState *dev, Error **errp)
static const VMStateDescription vmstate_timerblock = {
.name = "arm_mptimer_timerblock",
- .version_id = 2,
- .minimum_version_id = 2,
+ .version_id = 3,
+ .minimum_version_id = 3,
.fields = (VMStateField[]) {
- VMSTATE_UINT32(count, TimerBlock),
- VMSTATE_UINT32(load, TimerBlock),
VMSTATE_UINT32(control, TimerBlock),
VMSTATE_UINT32(status, TimerBlock),
- VMSTATE_INT64(tick, TimerBlock),
- VMSTATE_TIMER_PTR(timer, TimerBlock),
+ VMSTATE_PTIMER(timer, TimerBlock),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_arm_mptimer = {
.name = "arm_mptimer",
- .version_id = 2,
- .minimum_version_id = 2,
+ .version_id = 3,
+ .minimum_version_id = 3,
.fields = (VMStateField[]) {
VMSTATE_STRUCT_VARRAY_UINT32(timerblock, ARMMPTimerState, num_cpu,
- 2, vmstate_timerblock, TimerBlock),
+ 3, vmstate_timerblock, TimerBlock),
VMSTATE_END_OF_LIST()
}
};
diff --git a/include/hw/timer/arm_mptimer.h b/include/hw/timer/arm_mptimer.h
index b34cba0..c46d8d2 100644
--- a/include/hw/timer/arm_mptimer.h
+++ b/include/hw/timer/arm_mptimer.h
@@ -27,12 +27,9 @@
/* State of a single timer or watchdog block */
typedef struct {
- uint32_t count;
- uint32_t load;
uint32_t control;
uint32_t status;
- int64_t tick;
- QEMUTimer *timer;
+ struct ptimer_state *timer;
qemu_irq irq;
MemoryRegion iomem;
} TimerBlock;
--
2.9.0
^ permalink raw reply related [flat|nested] 9+ messages in thread