forked from Minki/linux
129 lines
2.2 KiB
C
129 lines
2.2 KiB
C
/*
|
|
* Definitions used in MIPS MT SMTC "Interprocessor Interrupt" code.
|
|
*/
|
|
#ifndef __ASM_SMTC_IPI_H
|
|
#define __ASM_SMTC_IPI_H
|
|
|
|
#include <linux/spinlock.h>
|
|
|
|
//#define SMTC_IPI_DEBUG
|
|
|
|
#ifdef SMTC_IPI_DEBUG
|
|
#include <asm/mipsregs.h>
|
|
#include <asm/mipsmtregs.h>
|
|
#endif /* SMTC_IPI_DEBUG */
|
|
|
|
/*
|
|
* An IPI "message"
|
|
*/
|
|
|
|
struct smtc_ipi {
|
|
struct smtc_ipi *flink;
|
|
int type;
|
|
void *arg;
|
|
int dest;
|
|
#ifdef SMTC_IPI_DEBUG
|
|
int sender;
|
|
long stamp;
|
|
#endif /* SMTC_IPI_DEBUG */
|
|
};
|
|
|
|
/*
|
|
* Defined IPI Types
|
|
*/
|
|
|
|
#define LINUX_SMP_IPI 1
|
|
#define SMTC_CLOCK_TICK 2
|
|
#define IRQ_AFFINITY_IPI 3
|
|
|
|
/*
|
|
* A queue of IPI messages
|
|
*/
|
|
|
|
struct smtc_ipi_q {
|
|
struct smtc_ipi *head;
|
|
spinlock_t lock;
|
|
struct smtc_ipi *tail;
|
|
int depth;
|
|
};
|
|
|
|
static inline void smtc_ipi_nq(struct smtc_ipi_q *q, struct smtc_ipi *p)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&q->lock, flags);
|
|
if (q->head == NULL)
|
|
q->head = q->tail = p;
|
|
else
|
|
q->tail->flink = p;
|
|
p->flink = NULL;
|
|
q->tail = p;
|
|
q->depth++;
|
|
#ifdef SMTC_IPI_DEBUG
|
|
p->sender = read_c0_tcbind();
|
|
p->stamp = read_c0_count();
|
|
#endif /* SMTC_IPI_DEBUG */
|
|
spin_unlock_irqrestore(&q->lock, flags);
|
|
}
|
|
|
|
static inline struct smtc_ipi *__smtc_ipi_dq(struct smtc_ipi_q *q)
|
|
{
|
|
struct smtc_ipi *p;
|
|
|
|
if (q->head == NULL)
|
|
p = NULL;
|
|
else {
|
|
p = q->head;
|
|
q->head = q->head->flink;
|
|
q->depth--;
|
|
/* Arguably unnecessary, but leaves queue cleaner */
|
|
if (q->head == NULL)
|
|
q->tail = NULL;
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
static inline struct smtc_ipi *smtc_ipi_dq(struct smtc_ipi_q *q)
|
|
{
|
|
unsigned long flags;
|
|
struct smtc_ipi *p;
|
|
|
|
spin_lock_irqsave(&q->lock, flags);
|
|
p = __smtc_ipi_dq(q);
|
|
spin_unlock_irqrestore(&q->lock, flags);
|
|
|
|
return p;
|
|
}
|
|
|
|
static inline void smtc_ipi_req(struct smtc_ipi_q *q, struct smtc_ipi *p)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&q->lock, flags);
|
|
if (q->head == NULL) {
|
|
q->head = q->tail = p;
|
|
p->flink = NULL;
|
|
} else {
|
|
p->flink = q->head;
|
|
q->head = p;
|
|
}
|
|
q->depth++;
|
|
spin_unlock_irqrestore(&q->lock, flags);
|
|
}
|
|
|
|
static inline int smtc_ipi_qdepth(struct smtc_ipi_q *q)
|
|
{
|
|
unsigned long flags;
|
|
int retval;
|
|
|
|
spin_lock_irqsave(&q->lock, flags);
|
|
retval = q->depth;
|
|
spin_unlock_irqrestore(&q->lock, flags);
|
|
return retval;
|
|
}
|
|
|
|
extern void smtc_send_ipi(int cpu, int type, unsigned int action);
|
|
|
|
#endif /* __ASM_SMTC_IPI_H */
|