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arch: arc: implement DIRECT IRQ support

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* implement DIRECT IRQ support both for normal irq and fast irq.
* add separate interrupt stack for fast irq and use CONFIG_ARC_
  _FIRQ_STACK to control it. This will bring shortest interrupt
  latency for fast irq.
* note that scheduing in DIRECT IRQ is not supported.

Signed-off-by: Wayne Ren <wei.ren@synopsys.com>
This commit is contained in:
Wayne Ren 2019-09-25 15:58:14 +08:00 • committed by Andrew Boie
commit 601b9afc9e
5 changed files with 215 additions and 0 deletions
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16
include/arch/arc/v2/arcv2_irq_unit.h
View file

@ -86,6 +86,22 @@ void z_arc_v2_irq_unit_int_disable(int irq)
z_arc_v2_irq_unit_irq_enable_set(irq, _ARC_V2_INT_DISABLE);
}
/*
* @brief Poll the enable status of interrupt
*
* Polls the enable status of the specified interrupt
*
* @return 1 enabled, 0 disabled
*/
static ALWAYS_INLINE
bool z_arc_v2_irq_unit_int_enabled(int irq)
{
z_arc_v2_aux_reg_write(_ARC_V2_IRQ_SELECT, irq);
return z_arc_v2_aux_reg_read(_ARC_V2_IRQ_ENABLE) & 0x1;
}
/*
* @brief Set interrupt priority
*

109
include/arch/arc/v2/irq.h
View file

@ -28,10 +28,13 @@ extern "C" {
GTEXT(_irq_exit);
GTEXT(z_arch_irq_enable)
GTEXT(z_arch_irq_disable)
GTEXT(z_arc_firq_stack_set)
#else
extern void z_arc_firq_stack_set(void);
extern void z_arch_irq_enable(unsigned int irq);
extern void z_arch_irq_disable(unsigned int irq);
extern int z_arch_irq_is_enabled(unsigned int irq);
extern void _irq_exit(void);
extern void z_irq_priority_set(unsigned int irq, unsigned int prio,
@ -54,6 +57,112 @@ extern void z_irq_spurious(void *unused);
irq_p; \
})
/**
* Configure a 'direct' static interrupt.
*
* When firq has no separate stack(CONFIG_ARC_FIRQ_STACK=N), it's not safe
* to call C ISR handlers because sp will be switched to bank1's sp which
* is undefined value.
* So for this case, the priority cannot be set to 0 but next level 1
*
* When firq has separate stack (CONFIG_ARC_FIRQ_STACK=y) but at the same
* time stack checking is enabled (CONFIG_ARC_STACK_CHECKING=y)
* the stack checking can raise stack check exception as sp is switched to
* firq's stack (bank1's sp). So for this case, the priority cannot be set
* to 0 but next level 1.
*
* Note that for the above cases, if application still wants to use firq by
* setting priority to 0. Application can call z_irq_priority_set again.
* Then it's left to application to handle the details of firq
*
* See include/irq.h for details.
* All arguments must be computable at build time.
*/
#define Z_ARCH_IRQ_DIRECT_CONNECT(irq_p, priority_p, isr_p, flags_p) \
({ \
Z_ISR_DECLARE(irq_p, ISR_FLAG_DIRECT, isr_p, NULL); \
BUILD_ASSERT_MSG(priority_p || !IS_ENABLED(CONFIG_ARC_FIRQ) || \
(IS_ENABLED(CONFIG_ARC_FIRQ_STACK) && \
!IS_ENABLED(CONFIG_ARC_STACK_CHECKING)), \
"irq priority cannot be set to 0 when CONFIG_ARC_FIRQ_STACK" \
"is not configured or CONFIG_ARC_FIRQ_STACK " \
"and CONFIG_ARC_STACK_CHECKING are configured together"); \
z_irq_priority_set(irq_p, priority_p, flags_p); \
irq_p; \
})
static inline void z_arch_isr_direct_header(void)
{
#ifdef CONFIG_TRACING
z_sys_trace_isr_enter();
#endif
}
static inline void z_arch_isr_direct_footer(int maybe_swap)
{
/* clear SW generated interrupt */
if (z_arc_v2_aux_reg_read(_ARC_V2_ICAUSE) ==
z_arc_v2_aux_reg_read(_ARC_V2_AUX_IRQ_HINT)) {
z_arc_v2_aux_reg_write(_ARC_V2_AUX_IRQ_HINT, 0);
}
#ifdef CONFIG_TRACING
z_sys_trace_isr_exit();
#endif
}
#define Z_ARCH_ISR_DIRECT_HEADER() z_arch_isr_direct_header()
extern void z_arch_isr_direct_header(void);
#define Z_ARCH_ISR_DIRECT_FOOTER(swap) z_arch_isr_direct_footer(swap)
/*
* Scheduling can not be done in direct isr. If required, please use kernel
* aware interrupt handling
*/
#define Z_ARCH_ISR_DIRECT_DECLARE(name) \
static inline int name##_body(void); \
__attribute__ ((interrupt("ilink")))void name(void) \
{ \
ISR_DIRECT_HEADER(); \
name##_body(); \
ISR_DIRECT_FOOTER(0); \
} \
static inline int name##_body(void)
/**
*
* @brief Disable all interrupts on the local CPU
*
* This routine disables interrupts. It can be called from either interrupt or
* thread level. This routine returns an architecture-dependent
* lock-out key representing the "interrupt disable state" prior to the call;
* this key can be passed to irq_unlock() to re-enable interrupts.
*
* The lock-out key should only be used as the argument to the
* irq_unlock() API. It should never be used to manually re-enable
* interrupts or to inspect or manipulate the contents of the source register.
*
* This function can be called recursively: it will return a key to return the
* state of interrupt locking to the previous level.
*
* WARNINGS
* Invoking a kernel routine with interrupts locked may result in
* interrupts being re-enabled for an unspecified period of time. If the
* called routine blocks, interrupts will be re-enabled while another
* thread executes, or while the system is idle.
*
* The "interrupt disable state" is an attribute of a thread. Thus, if a
* thread disables interrupts and subsequently invokes a kernel
* routine that causes the calling thread to block, the interrupt
* disable state will be restored when the thread is later rescheduled
* for execution.
*
* @return An architecture-dependent lock-out key representing the
* "interrupt disable state" prior to the call.
*/
static ALWAYS_INLINE unsigned int z_arch_irq_lock(void)
{
unsigned int key;