static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar)
{
struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
unsigned long flags;
int ret = 0;
u64 c;
spin_lock_irqsave(&hw->fifo_lock, flags);
c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
if (c & ENTRY_MASK_C)
ret = 1;
spin_unlock_irqrestore(&hw->fifo_lock, flags);
return ret;
}
/*
* FIFO queues, shared with hardware.
*
* If a queue has empty slots, an entry is added to the queue tail,
* and that entry is marked as occupied.
* Entries can be dequeued from the head of the list, when the device
* has marked the entry as consumed.
*
* Returns true on successful queue/dequeue, false on failure.
*/
static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
{
struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&hw->fifo_lock, flags);
if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask]
& ENTRY_MASK_O)) {
fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |=
(entry & ENTRY_MASK_NOSTATE) | fifo_q->merge;
fifo_q->tail += 1;
ret = 1;
}
spin_unlock_irqrestore(&hw->fifo_lock, flags);
return ret;
}
static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
{
struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
unsigned long flags;
int ret = 0;
u64 c;
spin_lock_irqsave(&hw->fifo_lock, flags);
c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
if (c & ENTRY_MASK_C) {
if (entry)
*entry = c & ENTRY_MASK_NOSTATE;
fifo_q->fifobar[fifo_q->head & fifo_q->imask] =
(c | ENTRY_MASK) + 1;
fifo_q->head += 1;
ret = 1;
}
spin_unlock_irqrestore(&hw->fifo_lock, flags);
return ret;
}
static inline void set_channel_reset(struct ccb *ccb)
{
/* set a flag indicating this channel needs a reset */
FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1;
}
static inline int is_channel_reset(struct ccb *ccb)
{
/* check for this particular channel needing a reset */
return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset;
}
static inline void set_channel_reset(struct ccb *ccb)
{
/* */
FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1;
}
static inline int is_channel_reset(struct ccb *ccb)
{
/* */
return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset;
}