Commit | Line | Data |
---|---|---|
41c594ab RB |
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 | ||
22e651c6 RB |
7 | #include <linux/spinlock.h> |
8 | ||
41c594ab RB |
9 | //#define SMTC_IPI_DEBUG |
10 | ||
11 | #ifdef SMTC_IPI_DEBUG | |
12 | #include <asm/mipsregs.h> | |
13 | #include <asm/mipsmtregs.h> | |
14 | #endif /* SMTC_IPI_DEBUG */ | |
15 | ||
16 | /* | |
17 | * An IPI "message" | |
18 | */ | |
19 | ||
20 | struct smtc_ipi { | |
21 | struct smtc_ipi *flink; | |
22 | int type; | |
23 | void *arg; | |
24 | int dest; | |
25 | #ifdef SMTC_IPI_DEBUG | |
26 | int sender; | |
27 | long stamp; | |
28 | #endif /* SMTC_IPI_DEBUG */ | |
29 | }; | |
30 | ||
31 | /* | |
32 | * Defined IPI Types | |
33 | */ | |
34 | ||
35 | #define LINUX_SMP_IPI 1 | |
36 | #define SMTC_CLOCK_TICK 2 | |
37 | ||
38 | /* | |
39 | * A queue of IPI messages | |
40 | */ | |
41 | ||
42 | struct smtc_ipi_q { | |
43 | struct smtc_ipi *head; | |
44 | spinlock_t lock; | |
45 | struct smtc_ipi *tail; | |
46 | int depth; | |
47 | }; | |
48 | ||
41c594ab RB |
49 | static inline void smtc_ipi_nq(struct smtc_ipi_q *q, struct smtc_ipi *p) |
50 | { | |
51 | long flags; | |
52 | ||
53 | spin_lock_irqsave(&q->lock, flags); | |
54 | if (q->head == NULL) | |
55 | q->head = q->tail = p; | |
56 | else | |
57 | q->tail->flink = p; | |
58 | p->flink = NULL; | |
59 | q->tail = p; | |
60 | q->depth++; | |
61 | #ifdef SMTC_IPI_DEBUG | |
62 | p->sender = read_c0_tcbind(); | |
63 | p->stamp = read_c0_count(); | |
64 | #endif /* SMTC_IPI_DEBUG */ | |
65 | spin_unlock_irqrestore(&q->lock, flags); | |
66 | } | |
67 | ||
68 | static inline struct smtc_ipi *smtc_ipi_dq(struct smtc_ipi_q *q) | |
69 | { | |
70 | struct smtc_ipi *p; | |
71 | long flags; | |
72 | ||
73 | spin_lock_irqsave(&q->lock, flags); | |
74 | if (q->head == NULL) | |
75 | p = NULL; | |
76 | else { | |
77 | p = q->head; | |
78 | q->head = q->head->flink; | |
79 | q->depth--; | |
80 | /* Arguably unnecessary, but leaves queue cleaner */ | |
81 | if (q->head == NULL) | |
82 | q->tail = NULL; | |
83 | } | |
84 | spin_unlock_irqrestore(&q->lock, flags); | |
85 | return p; | |
86 | } | |
87 | ||
88 | static inline void smtc_ipi_req(struct smtc_ipi_q *q, struct smtc_ipi *p) | |
89 | { | |
90 | long flags; | |
91 | ||
92 | spin_lock_irqsave(&q->lock, flags); | |
93 | if (q->head == NULL) { | |
94 | q->head = q->tail = p; | |
95 | p->flink = NULL; | |
96 | } else { | |
97 | p->flink = q->head; | |
98 | q->head = p; | |
99 | } | |
100 | q->depth++; | |
101 | spin_unlock_irqrestore(&q->lock, flags); | |
102 | } | |
103 | ||
104 | static inline int smtc_ipi_qdepth(struct smtc_ipi_q *q) | |
105 | { | |
106 | long flags; | |
107 | int retval; | |
108 | ||
109 | spin_lock_irqsave(&q->lock, flags); | |
110 | retval = q->depth; | |
111 | spin_unlock_irqrestore(&q->lock, flags); | |
112 | return retval; | |
113 | } | |
114 | ||
115 | extern void smtc_send_ipi(int cpu, int type, unsigned int action); | |
116 | ||
117 | #endif /* __ASM_SMTC_IPI_H */ |