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sparc64: ensure LDC channel is ready before communication

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Ensure that LDC channel is up before writing to it, in RAW mode. Generate
event to bring the LDC channel up, if it's not up already.

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Aaron Young <aaron.young@oracle.com>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Reviewed-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jag Raman 2017-06-09 12:29:30 -04:00 committed by David S. Miller
parent 29693e75a8
commit fc43b978a0
1 changed files with 25 additions and 5 deletions
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30
arch/sparc/kernel/ldc.c
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@ -813,9 +813,14 @@ static irqreturn_t ldc_rx(int irq, void *dev_id)
lp->hs_state = LDC_HS_COMPLETE;
ldc_set_state(lp, LDC_STATE_CONNECTED);
event_mask |= LDC_EVENT_UP;
orig_state = lp->chan_state;
/*
* Generate an LDC_EVENT_UP event if the channel
* was not already up.
*/
if (orig_state != LDC_CHANNEL_UP) {
event_mask |= LDC_EVENT_UP;
orig_state = lp->chan_state;
}
}
/* If we are in reset state, flush the RX queue and ignore
@ -929,7 +934,14 @@ static irqreturn_t ldc_tx(int irq, void *dev_id)
lp->hs_state = LDC_HS_COMPLETE;
ldc_set_state(lp, LDC_STATE_CONNECTED);
event_mask |= LDC_EVENT_UP;
/*
* Generate an LDC_EVENT_UP event if the channel
* was not already up.
*/
if (orig_state != LDC_CHANNEL_UP) {
event_mask |= LDC_EVENT_UP;
orig_state = lp->chan_state;
}
}
spin_unlock_irqrestore(&lp->lock, flags);
@ -1475,9 +1487,17 @@ void __ldc_print(struct ldc_channel *lp, const char *caller)
static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size)
{
struct ldc_packet *p;
unsigned long new_tail;
unsigned long new_tail, hv_err;
int err;
hv_err = sun4v_ldc_tx_get_state(lp->id, &lp->tx_head, &lp->tx_tail,
&lp->chan_state);
if (unlikely(hv_err))
return -EBUSY;
if (unlikely(lp->chan_state != LDC_CHANNEL_UP))
return LDC_ABORT(lp);
if (size > LDC_PACKET_SIZE)
return -EMSGSIZE;