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arch/risc-v/riscv_mtimer: Update the mtimecmp value once per interrupt event. 

Cache the next timeout value in the drivers instance and update the mtimecmp value once. This is advantageous as the opensbi ecall to set the timer is expensive in systems which don't have the supervisor mode timer extension.
This commit is contained in:
Stuart Ianna 2024-05-31 14:23:31 +10:00 committed by Alan Carvalho de Assis
parent 105e4f44d4
commit e3056c781e
1 changed files with 29 additions and 14 deletions
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43
arch/risc-v/src/common/riscv_mtimer.c
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@ -212,18 +212,27 @@ static int riscv_mtimer_start(struct oneshot_lowerhalf_s *lower,
struct riscv_mtimer_lowerhalf_s *priv =
(struct riscv_mtimer_lowerhalf_s *)lower;
uint64_t mtime = riscv_mtimer_get_mtime(priv);
uint64_t alarm = mtime + ts->tv_sec * priv->freq +
ts->tv_nsec * priv->freq / NSEC_PER_SEC;
priv->alarm = mtime + ts->tv_sec * priv->freq +
ts->tv_nsec * priv->freq / NSEC_PER_SEC;
if (priv->alarm < mtime)
if (alarm < mtime)
{
priv->alarm = UINT64_MAX;
priv->alarm = UINT64_MAX;
priv->callback = NULL;
priv->arg = NULL;
}
else
{
priv->alarm = alarm;
priv->callback = callback;
priv->arg = arg;
}
priv->callback = callback;
priv->arg = arg;
if (!up_interrupt_context())
{
riscv_mtimer_set_mtimecmp(priv, priv->alarm);
}
riscv_mtimer_set_mtimecmp(priv, priv->alarm);
return 0;
}
@ -257,15 +266,18 @@ static int riscv_mtimer_cancel(struct oneshot_lowerhalf_s *lower,
struct riscv_mtimer_lowerhalf_s *priv =
(struct riscv_mtimer_lowerhalf_s *)lower;
uint64_t mtime;
uint64_t alarm = priv->alarm;
riscv_mtimer_set_mtimecmp(priv, UINT64_MAX);
priv->alarm = UINT64_MAX;
if (!up_interrupt_context())
{
riscv_mtimer_set_mtimecmp(priv, priv->alarm);
}
mtime = riscv_mtimer_get_mtime(priv);
if (priv->alarm > mtime)
if (alarm > mtime)
{
uint64_t nsec = (priv->alarm - mtime) *
NSEC_PER_SEC / priv->freq;
uint64_t nsec = (alarm - mtime) * NSEC_PER_SEC / priv->freq;
ts->tv_sec = nsec / NSEC_PER_SEC;
ts->tv_nsec = nsec % NSEC_PER_SEC;
}
@ -319,12 +331,14 @@ static int riscv_mtimer_interrupt(int irq, void *context, void *arg)
{
struct riscv_mtimer_lowerhalf_s *priv = arg;
riscv_mtimer_set_mtimecmp(priv, UINT64_MAX);
priv->alarm = UINT64_MAX;
if (priv->callback != NULL)
{
priv->callback(&priv->lower, priv->arg);
}
riscv_mtimer_set_mtimecmp(priv, priv->alarm);
return 0;
}
@ -345,8 +359,9 @@ riscv_mtimer_initialize(uintptr_t mtime, uintptr_t mtimecmp,
priv->mtime = mtime;
priv->mtimecmp = mtimecmp;
priv->freq = freq;
priv->alarm = UINT64_MAX;
riscv_mtimer_set_mtimecmp(priv, UINT64_MAX);
riscv_mtimer_set_mtimecmp(priv, priv->alarm);
irq_attach(irq, riscv_mtimer_interrupt, priv);
up_enable_irq(irq);
}