| Ralf Baechle | 41c594a | 2006-04-05 09:45:45 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Definitions used in MIPS MT SMTC "Interprocessor Interrupt" code. |
| 3 | */ |
| 4 | #ifndef __ASM_SMTC_IPI_H |
| 5 | #define __ASM_SMTC_IPI_H |
| 6 | |
| 7 | //#define SMTC_IPI_DEBUG |
| 8 | |
| 9 | #ifdef SMTC_IPI_DEBUG |
| 10 | #include <asm/mipsregs.h> |
| 11 | #include <asm/mipsmtregs.h> |
| 12 | #endif /* SMTC_IPI_DEBUG */ |
| 13 | |
| 14 | /* |
| 15 | * An IPI "message" |
| 16 | */ |
| 17 | |
| 18 | struct smtc_ipi { |
| 19 | struct smtc_ipi *flink; |
| 20 | int type; |
| 21 | void *arg; |
| 22 | int dest; |
| 23 | #ifdef SMTC_IPI_DEBUG |
| 24 | int sender; |
| 25 | long stamp; |
| 26 | #endif /* SMTC_IPI_DEBUG */ |
| 27 | }; |
| 28 | |
| 29 | /* |
| 30 | * Defined IPI Types |
| 31 | */ |
| 32 | |
| 33 | #define LINUX_SMP_IPI 1 |
| 34 | #define SMTC_CLOCK_TICK 2 |
| 35 | |
| 36 | /* |
| 37 | * A queue of IPI messages |
| 38 | */ |
| 39 | |
| 40 | struct smtc_ipi_q { |
| 41 | struct smtc_ipi *head; |
| 42 | spinlock_t lock; |
| 43 | struct smtc_ipi *tail; |
| 44 | int depth; |
| 45 | }; |
| 46 | |
| 47 | extern struct smtc_ipi_q IPIQ[NR_CPUS]; |
| 48 | extern struct smtc_ipi_q freeIPIq; |
| 49 | |
| 50 | static inline void smtc_ipi_nq(struct smtc_ipi_q *q, struct smtc_ipi *p) |
| 51 | { |
| 52 | long flags; |
| 53 | |
| 54 | spin_lock_irqsave(&q->lock, flags); |
| 55 | if (q->head == NULL) |
| 56 | q->head = q->tail = p; |
| 57 | else |
| 58 | q->tail->flink = p; |
| 59 | p->flink = NULL; |
| 60 | q->tail = p; |
| 61 | q->depth++; |
| 62 | #ifdef SMTC_IPI_DEBUG |
| 63 | p->sender = read_c0_tcbind(); |
| 64 | p->stamp = read_c0_count(); |
| 65 | #endif /* SMTC_IPI_DEBUG */ |
| 66 | spin_unlock_irqrestore(&q->lock, flags); |
| 67 | } |
| 68 | |
| 69 | static inline struct smtc_ipi *smtc_ipi_dq(struct smtc_ipi_q *q) |
| 70 | { |
| 71 | struct smtc_ipi *p; |
| 72 | long flags; |
| 73 | |
| 74 | spin_lock_irqsave(&q->lock, flags); |
| 75 | if (q->head == NULL) |
| 76 | p = NULL; |
| 77 | else { |
| 78 | p = q->head; |
| 79 | q->head = q->head->flink; |
| 80 | q->depth--; |
| 81 | /* Arguably unnecessary, but leaves queue cleaner */ |
| 82 | if (q->head == NULL) |
| 83 | q->tail = NULL; |
| 84 | } |
| 85 | spin_unlock_irqrestore(&q->lock, flags); |
| 86 | return p; |
| 87 | } |
| 88 | |
| 89 | static inline void smtc_ipi_req(struct smtc_ipi_q *q, struct smtc_ipi *p) |
| 90 | { |
| 91 | long flags; |
| 92 | |
| 93 | spin_lock_irqsave(&q->lock, flags); |
| 94 | if (q->head == NULL) { |
| 95 | q->head = q->tail = p; |
| 96 | p->flink = NULL; |
| 97 | } else { |
| 98 | p->flink = q->head; |
| 99 | q->head = p; |
| 100 | } |
| 101 | q->depth++; |
| 102 | spin_unlock_irqrestore(&q->lock, flags); |
| 103 | } |
| 104 | |
| 105 | static inline int smtc_ipi_qdepth(struct smtc_ipi_q *q) |
| 106 | { |
| 107 | long flags; |
| 108 | int retval; |
| 109 | |
| 110 | spin_lock_irqsave(&q->lock, flags); |
| 111 | retval = q->depth; |
| 112 | spin_unlock_irqrestore(&q->lock, flags); |
| 113 | return retval; |
| 114 | } |
| 115 | |
| 116 | extern void smtc_send_ipi(int cpu, int type, unsigned int action); |
| 117 | |
| 118 | #endif /* __ASM_SMTC_IPI_H */ |