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[MIPS] SMTC: Fix SMTC dyntick support.

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Rework of SMTC support to make it work with the new clock event system,
allowing "tickless" operation, and to make it compatible with the use of
the "wait_irqoff" idle loop.  The new clocking scheme means that the
previously optional IPI instant replay mechanism is now required, and has
been made more robust.

Signed-off-by: Kevin D. Kissell <kevink@paralogos.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Kevin D. Kissell
2008-09-09 21:48:52 +02:00
committed by Ralf Baechle
parent d2bb01b042
commit 8531a35e5e
11 changed files with 596 additions and 278 deletions
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26
include/asm-mips/irqflags.h
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@@ -38,8 +38,17 @@ __asm__(
" .set pop \n"
" .endm");
extern void smtc_ipi_replay(void);
static inline void raw_local_irq_enable(void)
{
#ifdef CONFIG_MIPS_MT_SMTC
/*
* SMTC kernel needs to do a software replay of queued
* IPIs, at the cost of call overhead on each local_irq_enable()
*/
smtc_ipi_replay();
#endif
__asm__ __volatile__(
"raw_local_irq_enable"
: /* no outputs */
@@ -47,6 +56,7 @@ static inline void raw_local_irq_enable(void)
: "memory");
}
/*
* For cli() we have to insert nops to make sure that the new value
* has actually arrived in the status register before the end of this
@@ -185,15 +195,14 @@ __asm__(
" .set pop \n"
" .endm \n");
extern void smtc_ipi_replay(void);
static inline void raw_local_irq_restore(unsigned long flags)
{
unsigned long __tmp1;
#ifdef CONFIG_MIPS_MT_SMTC_INSTANT_REPLAY
#ifdef CONFIG_MIPS_MT_SMTC
/*
* CONFIG_MIPS_MT_SMTC_INSTANT_REPLAY does prompt replay of deferred
* SMTC kernel needs to do a software replay of queued
* IPIs, at the cost of branch and call overhead on each
* local_irq_restore()
*/
@@ -208,6 +217,17 @@ static inline void raw_local_irq_restore(unsigned long flags)
: "memory");
}
static inline void __raw_local_irq_restore(unsigned long flags)
{
unsigned long __tmp1;
__asm__ __volatile__(
"raw_local_irq_restore\t%0"
: "=r" (__tmp1)
: "0" (flags)
: "memory");
}
static inline int raw_irqs_disabled_flags(unsigned long flags)
{
#ifdef CONFIG_MIPS_MT_SMTC