/* * 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 /* * 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) { 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) { 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) { 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 */