forked from Minki/linux
sparc64: expand LDC interface
Add the following LDC APIs which are planned to be used by LDC clients in the future: - ldc_set_state: Sets given LDC channel to given state - ldc_mode: Returns the mode of given LDC channel - ldc_print: Prints info about given LDC channel - ldc_rx_reset: Reset the RX queue of given LDC channel 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>
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@ -48,6 +48,8 @@ struct ldc_channel_config {
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#define LDC_STATE_READY 0x03
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#define LDC_STATE_CONNECTED 0x04
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#define LDC_PACKET_SIZE 64
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struct ldc_channel;
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/* Allocate state for a channel. */
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@ -72,6 +74,12 @@ int ldc_connect(struct ldc_channel *lp);
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int ldc_disconnect(struct ldc_channel *lp);
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int ldc_state(struct ldc_channel *lp);
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void ldc_set_state(struct ldc_channel *lp, u8 state);
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int ldc_mode(struct ldc_channel *lp);
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void __ldc_print(struct ldc_channel *lp, const char *caller);
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int ldc_rx_reset(struct ldc_channel *lp);
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#define ldc_print(chan) __ldc_print(chan, __func__)
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/* Read and write operations. Only valid when the link is up. */
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int ldc_write(struct ldc_channel *lp, const void *buf,
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@ -34,7 +34,6 @@
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static char version[] =
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DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
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#define LDC_PACKET_SIZE 64
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/* Packet header layout for unreliable and reliable mode frames.
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* When in RAW mode, packets are simply straight 64-byte payloads
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@ -196,15 +195,6 @@ static const char *state_to_str(u8 state)
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}
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}
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static void ldc_set_state(struct ldc_channel *lp, u8 state)
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{
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ldcdbg(STATE, "STATE (%s) --> (%s)\n",
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state_to_str(lp->state),
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state_to_str(state));
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lp->state = state;
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}
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static unsigned long __advance(unsigned long off, unsigned long num_entries)
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{
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off += LDC_PACKET_SIZE;
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@ -829,7 +819,7 @@ static irqreturn_t ldc_rx(int irq, void *dev_id)
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* everything.
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*/
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if (lp->flags & LDC_FLAG_RESET) {
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(void) __set_rx_head(lp, lp->rx_tail);
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(void) ldc_rx_reset(lp);
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goto out;
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}
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@ -1447,6 +1437,38 @@ int ldc_state(struct ldc_channel *lp)
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}
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EXPORT_SYMBOL(ldc_state);
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void ldc_set_state(struct ldc_channel *lp, u8 state)
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{
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ldcdbg(STATE, "STATE (%s) --> (%s)\n",
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state_to_str(lp->state),
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state_to_str(state));
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lp->state = state;
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}
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int ldc_mode(struct ldc_channel *lp)
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{
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return lp->cfg.mode;
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}
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int ldc_rx_reset(struct ldc_channel *lp)
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{
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return __set_rx_head(lp, lp->rx_tail);
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}
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void __ldc_print(struct ldc_channel *lp, const char *caller)
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{
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pr_info("%s: id=0x%lx flags=0x%x state=%s cstate=0x%lx hsstate=0x%x\n"
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"\trx_h=0x%lx rx_t=0x%lx rx_n=%ld\n"
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"\ttx_h=0x%lx tx_t=0x%lx tx_n=%ld\n"
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"\trcv_nxt=%u snd_nxt=%u\n",
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caller, lp->id, lp->flags, state_to_str(lp->state),
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lp->chan_state, lp->hs_state,
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lp->rx_head, lp->rx_tail, lp->rx_num_entries,
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lp->tx_head, lp->tx_tail, lp->tx_num_entries,
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lp->rcv_nxt, lp->snd_nxt);
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}
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static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size)
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{
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struct ldc_packet *p;
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@ -1592,7 +1614,7 @@ static int rx_bad_seq(struct ldc_channel *lp, struct ldc_packet *p,
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if (err)
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return err;
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err = __set_rx_head(lp, lp->rx_tail);
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err = ldc_rx_reset(lp);
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if (err < 0)
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return ldc_abort(lp);
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