drivers/scsi/arm/msgqueue.h

Source file repositories/reference/linux-study-clean/drivers/scsi/arm/msgqueue.h

File Facts

System
Linux kernel
Corpus path
drivers/scsi/arm/msgqueue.h
Extension
.h
Size
2011 bytes
Lines
80
Domain
Driver Families
Bucket
drivers/scsi
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct message {
    char msg[8];
    int length;
    int fifo;
};

struct msgqueue_entry {
    struct message msg;
    struct msgqueue_entry *next;
};

#define NR_MESSAGES 4

typedef struct {
    struct msgqueue_entry *qe;
    struct msgqueue_entry *free;
    struct msgqueue_entry entries[NR_MESSAGES];
} MsgQueue_t;

/*
 * Function: void msgqueue_initialise(MsgQueue_t *msgq)
 * Purpose : initialise a message queue
 * Params  : msgq - queue to initialise
 */
extern void msgqueue_initialise(MsgQueue_t *msgq);

/*
 * Function: void msgqueue_free(MsgQueue_t *msgq)
 * Purpose : free a queue
 * Params  : msgq - queue to free
 */
extern void msgqueue_free(MsgQueue_t *msgq);

/*
 * Function: int msgqueue_msglength(MsgQueue_t *msgq)
 * Purpose : calculate the total length of all messages on the message queue
 * Params  : msgq - queue to examine
 * Returns : number of bytes of messages in queue
 */
extern int msgqueue_msglength(MsgQueue_t *msgq);

/*
 * Function: struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno)
 * Purpose : return a message & its length
 * Params  : msgq   - queue to obtain message from
 *         : msgno  - message number
 * Returns : pointer to message string, or NULL
 */
extern struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno);

/*
 * Function: int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...)
 * Purpose : add a message onto a message queue
 * Params  : msgq   - queue to add message on
 *	     length - length of message
 *	     ...    - message bytes
 * Returns : != 0 if successful
 */
extern int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...);

/*
 * Function: void msgqueue_flush(MsgQueue_t *msgq)
 * Purpose : flush all messages from message queue
 * Params  : msgq - queue to flush
 */
extern void msgqueue_flush(MsgQueue_t *msgq);

#endif

Annotation

Implementation Notes