示例#1
0
static void reset_flags(struct si_sm_data *bt)
{
	if (bt_debug)
		printk(KERN_WARNING "IPMI BT: flag reset %s\n",
					status2txt(BT_STATUS));
	if (BT_STATUS & BT_H_BUSY)
		BT_CONTROL(BT_H_BUSY);	/* force clear */
	BT_CONTROL(BT_CLR_WR_PTR);	/* always reset */
	BT_CONTROL(BT_SMS_ATN);		/* always clear */
	BT_INTMASK_W(BT_BMC_HWRST);
}
示例#2
0
static void drain_BMC2HOST(struct si_sm_data *bt)
{
	int i, size;

	if (!(BT_STATUS & BT_B2H_ATN)) 	/* Not signalling a response */
		return;

	BT_CONTROL(BT_H_BUSY);		/* now set */
	BT_CONTROL(BT_B2H_ATN);		/* always clear */
	BT_STATUS;			/* pause */
	BT_CONTROL(BT_B2H_ATN);		/* some BMCs are stubborn */
	BT_CONTROL(BT_CLR_RD_PTR);	/* always reset */
	if (bt_debug)
		printk(KERN_WARNING "IPMI BT: stale response %s; ",
			status2txt(BT_STATUS));
	size = BMC2HOST;
	for (i = 0; i < size ; i++)
		BMC2HOST;
	BT_CONTROL(BT_H_BUSY);		/* now clear */
	if (bt_debug)
		printk("drained %d bytes\n", size + 1);
}
示例#3
0
static void reset_flags(struct si_sm_data *bt)
{
	if (BT_STATUS & BT_H_BUSY) BT_CONTROL(BT_H_BUSY);
	if (BT_STATUS & BT_B_BUSY) BT_CONTROL(BT_B_BUSY);
	BT_CONTROL(BT_CLR_WR_PTR);
	BT_CONTROL(BT_SMS_ATN);

	if (BT_STATUS & BT_B2H_ATN) {
		int i;
		BT_CONTROL(BT_H_BUSY);
		BT_CONTROL(BT_B2H_ATN);
		BT_CONTROL(BT_CLR_RD_PTR);
		for (i = 0; i < IPMI_MAX_MSG_LENGTH + 2; i++) BMC2HOST;
		BT_CONTROL(BT_H_BUSY);
	}
}
示例#4
0
static void reset_flags(struct si_sm_data *bt)
{
	if (BT_STATUS & BT_H_BUSY) BT_CONTROL(BT_H_BUSY);
	if (BT_STATUS & BT_B_BUSY) BT_CONTROL(BT_B_BUSY);
	BT_CONTROL(BT_CLR_WR_PTR);
	BT_CONTROL(BT_SMS_ATN);
#ifdef DEVELOPMENT_ONLY_NOT_FOR_PRODUCTION
	if (BT_STATUS & BT_B2H_ATN) {
		int i;
		BT_CONTROL(BT_H_BUSY);
		BT_CONTROL(BT_B2H_ATN);
		BT_CONTROL(BT_CLR_RD_PTR);
		for (i = 0; i < IPMI_MAX_MSG_LENGTH + 2; i++) BMC2HOST;
		BT_CONTROL(BT_H_BUSY);
	}
#endif
}
示例#5
0
static enum si_sm_result bt_event(struct si_sm_data *bt, long time)
{
	unsigned char status, BT_CAP[8];
	static enum bt_states last_printed = BT_STATE_PRINTME;
	int i;

	status = BT_STATUS;
	bt->nonzero_status |= status;
	if ((bt_debug & BT_DEBUG_STATES) && (bt->state != last_printed)) {
		printk(KERN_WARNING "BT: %s %s TO=%ld - %ld \n",
			STATE2TXT,
			STATUS2TXT,
			bt->timeout,
			time);
		last_printed = bt->state;
	}

	/*
	 * Commands that time out may still (eventually) provide a response.
	 * This stale response will get in the way of a new response so remove
	 * it if possible (hopefully during IDLE).  Even if it comes up later
	 * it will be rejected by its (now-forgotten) seq number.
	 */

	if ((bt->state < BT_STATE_WRITE_BYTES) && (status & BT_B2H_ATN)) {
		drain_BMC2HOST(bt);
		BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
	}

	if ((bt->state != BT_STATE_IDLE) &&
	    (bt->state <  BT_STATE_PRINTME)) {
		/* check timeout */
		bt->timeout -= time;
		if ((bt->timeout < 0) && (bt->state < BT_STATE_RESET1))
			return error_recovery(bt,
					      status,
					      IPMI_TIMEOUT_ERR);
	}

	switch (bt->state) {

	/*
	 * Idle state first checks for asynchronous messages from another
	 * channel, then does some opportunistic housekeeping.
	 */

	case BT_STATE_IDLE:
		if (status & BT_SMS_ATN) {
			BT_CONTROL(BT_SMS_ATN);	/* clear it */
			return SI_SM_ATTN;
		}

		if (status & BT_H_BUSY)		/* clear a leftover H_BUSY */
			BT_CONTROL(BT_H_BUSY);

		/* Read BT capabilities if it hasn't been done yet */
		if (!bt->BT_CAP_outreqs)
			BT_STATE_CHANGE(BT_STATE_CAPABILITIES_BEGIN,
					SI_SM_CALL_WITHOUT_DELAY);
		bt->timeout = bt->BT_CAP_req2rsp;
		BT_SI_SM_RETURN(SI_SM_IDLE);

	case BT_STATE_XACTION_START:
		if (status & (BT_B_BUSY | BT_H2B_ATN))
			BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
		if (BT_STATUS & BT_H_BUSY)
			BT_CONTROL(BT_H_BUSY);	/* force clear */
		BT_STATE_CHANGE(BT_STATE_WRITE_BYTES,
				SI_SM_CALL_WITHOUT_DELAY);

	case BT_STATE_WRITE_BYTES:
		if (status & BT_H_BUSY)
			BT_CONTROL(BT_H_BUSY);	/* clear */
		BT_CONTROL(BT_CLR_WR_PTR);
		write_all_bytes(bt);
		BT_CONTROL(BT_H2B_ATN);	/* can clear too fast to catch */
		BT_STATE_CHANGE(BT_STATE_WRITE_CONSUME,
				SI_SM_CALL_WITHOUT_DELAY);

	case BT_STATE_WRITE_CONSUME:
		if (status & (BT_B_BUSY | BT_H2B_ATN))
			BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
		BT_STATE_CHANGE(BT_STATE_READ_WAIT,
				SI_SM_CALL_WITHOUT_DELAY);

	/* Spinning hard can suppress B2H_ATN and force a timeout */

	case BT_STATE_READ_WAIT:
		if (!(status & BT_B2H_ATN))
			BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
		BT_CONTROL(BT_H_BUSY);		/* set */

		/*
		 * Uncached, ordered writes should just proceeed serially but
		 * some BMCs don't clear B2H_ATN with one hit.  Fast-path a
		 * workaround without too much penalty to the general case.
		 */

		BT_CONTROL(BT_B2H_ATN);		/* clear it to ACK the BMC */
		BT_STATE_CHANGE(BT_STATE_CLEAR_B2H,
				SI_SM_CALL_WITHOUT_DELAY);

	case BT_STATE_CLEAR_B2H:
		if (status & BT_B2H_ATN) {
			/* keep hitting it */
			BT_CONTROL(BT_B2H_ATN);
			BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
		}
		BT_STATE_CHANGE(BT_STATE_READ_BYTES,
				SI_SM_CALL_WITHOUT_DELAY);

	case BT_STATE_READ_BYTES:
		if (!(status & BT_H_BUSY))
			/* check in case of retry */
			BT_CONTROL(BT_H_BUSY);
		BT_CONTROL(BT_CLR_RD_PTR);	/* start of BMC2HOST buffer */
		i = read_all_bytes(bt);		/* true == packet seq match */
		BT_CONTROL(BT_H_BUSY);		/* NOW clear */
		if (!i) 			/* Not my message */
			BT_STATE_CHANGE(BT_STATE_READ_WAIT,
					SI_SM_CALL_WITHOUT_DELAY);
		bt->state = bt->complete;
		return bt->state == BT_STATE_IDLE ?	/* where to next? */
			SI_SM_TRANSACTION_COMPLETE :	/* normal */
			SI_SM_CALL_WITHOUT_DELAY;	/* Startup magic */

	case BT_STATE_LONG_BUSY:	/* For example: after FW update */
		if (!(status & BT_B_BUSY)) {
			reset_flags(bt);	/* next state is now IDLE */
			bt_init_data(bt, bt->io);
		}
		return SI_SM_CALL_WITH_DELAY;	/* No repeat printing */

	case BT_STATE_RESET1:
		reset_flags(bt);
		drain_BMC2HOST(bt);
		BT_STATE_CHANGE(BT_STATE_RESET2,
				SI_SM_CALL_WITH_DELAY);

	case BT_STATE_RESET2:		/* Send a soft reset */
		BT_CONTROL(BT_CLR_WR_PTR);
		HOST2BMC(3);		/* number of bytes following */
		HOST2BMC(0x18);		/* NetFn/LUN == Application, LUN 0 */
		HOST2BMC(42);		/* Sequence number */
		HOST2BMC(3);		/* Cmd == Soft reset */
		BT_CONTROL(BT_H2B_ATN);
		bt->timeout = BT_RESET_DELAY * 1000000;
		BT_STATE_CHANGE(BT_STATE_RESET3,
				SI_SM_CALL_WITH_DELAY);

	case BT_STATE_RESET3:		/* Hold off everything for a bit */
		if (bt->timeout > 0)
			return SI_SM_CALL_WITH_DELAY;
		drain_BMC2HOST(bt);
		BT_STATE_CHANGE(BT_STATE_RESTART,
				SI_SM_CALL_WITH_DELAY);

	case BT_STATE_RESTART:		/* don't reset retries or seq! */
		bt->read_count = 0;
		bt->nonzero_status = 0;
		bt->timeout = bt->BT_CAP_req2rsp;
		BT_STATE_CHANGE(BT_STATE_XACTION_START,
				SI_SM_CALL_WITH_DELAY);

	/*
	 * Get BT Capabilities, using timing of upper level state machine.
	 * Set outreqs to prevent infinite loop on timeout.
	 */
	case BT_STATE_CAPABILITIES_BEGIN:
		bt->BT_CAP_outreqs = 1;
		{
			unsigned char GetBT_CAP[] = { 0x18, 0x36 };
			bt->state = BT_STATE_IDLE;
			bt_start_transaction(bt, GetBT_CAP, sizeof(GetBT_CAP));
		}
		bt->complete = BT_STATE_CAPABILITIES_END;
		BT_STATE_CHANGE(BT_STATE_XACTION_START,
				SI_SM_CALL_WITH_DELAY);

	case BT_STATE_CAPABILITIES_END:
		i = bt_get_result(bt, BT_CAP, sizeof(BT_CAP));
		bt_init_data(bt, bt->io);
		if ((i == 8) && !BT_CAP[2]) {
			bt->BT_CAP_outreqs = BT_CAP[3];
			bt->BT_CAP_req2rsp = BT_CAP[6] * 1000000;
			bt->BT_CAP_retries = BT_CAP[7];
		} else
			printk(KERN_WARNING "IPMI BT: using default values\n");
		if (!bt->BT_CAP_outreqs)
			bt->BT_CAP_outreqs = 1;
		printk(KERN_WARNING "IPMI BT: req2rsp=%ld secs retries=%d\n",
			bt->BT_CAP_req2rsp / 1000000L, bt->BT_CAP_retries);
		bt->timeout = bt->BT_CAP_req2rsp;
		return SI_SM_CALL_WITHOUT_DELAY;

	default:	/* should never occur */
		return error_recovery(bt,
				      status,
				      IPMI_ERR_UNSPECIFIED);
	}
	return SI_SM_CALL_WITH_DELAY;
}
示例#6
0
static enum si_sm_result bt_event(struct si_sm_data *bt, long time)
{
	unsigned char status;
	char buf[40]; /* For getting status */
	int i;

	status = BT_STATUS;
	bt->nonzero_status |= status;

	if ((bt_debug & BT_DEBUG_STATES) && (bt->state != bt->last_state))
		printk(KERN_WARNING "BT: %s %s TO=%ld - %ld \n",
			STATE2TXT,
			STATUS2TXT(buf),
			bt->timeout,
			time);
	bt->last_state = bt->state;

	if (bt->state == BT_STATE_HOSED) return SI_SM_HOSED;

	if (bt->state != BT_STATE_IDLE) {	/* do timeout test */

		/* Certain states, on error conditions, can lock up a CPU
		   because they are effectively in an infinite loop with
		   CALL_WITHOUT_DELAY (right back here with time == 0).
		   Prevent infinite lockup by ALWAYS decrementing timeout. */

    	/* FIXME: bt_event is sometimes called with time > BT_NORMAL_TIMEOUT
              (noticed in ipmi_smic_sm.c January 2004) */

		if ((time <= 0) || (time >= BT_NORMAL_TIMEOUT)) time = 100;
		bt->timeout -= time;
		if ((bt->timeout < 0) && (bt->state < BT_STATE_RESET1)) {
			error_recovery(bt, "timed out");
			return SI_SM_CALL_WITHOUT_DELAY;
		}
	}

	switch (bt->state) {

    	case BT_STATE_IDLE:	/* check for asynchronous messages */
		if (status & BT_SMS_ATN) {
			BT_CONTROL(BT_SMS_ATN);	/* clear it */
			return SI_SM_ATTN;
		}
		return SI_SM_IDLE;

	case BT_STATE_XACTION_START:
		if (status & BT_H_BUSY) {
			BT_CONTROL(BT_H_BUSY);
			break;
		}
    		if (status & BT_B2H_ATN) break;
		bt->state = BT_STATE_WRITE_BYTES;
		return SI_SM_CALL_WITHOUT_DELAY;	/* for logging */

	case BT_STATE_WRITE_BYTES:
		if (status & (BT_B_BUSY | BT_H2B_ATN)) break;
		BT_CONTROL(BT_CLR_WR_PTR);
		write_all_bytes(bt);
		BT_CONTROL(BT_H2B_ATN);	/* clears too fast to catch? */
		bt->state = BT_STATE_WRITE_CONSUME;
		return SI_SM_CALL_WITHOUT_DELAY; /* it MIGHT sail through */

	case BT_STATE_WRITE_CONSUME: /* BMCs usually blow right thru here */
        	if (status & (BT_H2B_ATN | BT_B_BUSY)) break;
		bt->state = BT_STATE_B2H_WAIT;
		/* fall through with status */

	/* Stay in BT_STATE_B2H_WAIT until a packet matches.  However, spinning
	   hard here, constantly reading status, seems to hold off the
	   generation of B2H_ATN so ALWAYS return CALL_WITH_DELAY. */

	case BT_STATE_B2H_WAIT:
    		if (!(status & BT_B2H_ATN)) break;

		/* Assume ordered, uncached writes: no need to wait */
		if (!(status & BT_H_BUSY)) BT_CONTROL(BT_H_BUSY); /* set */
		BT_CONTROL(BT_B2H_ATN);		/* clear it, ACK to the BMC */
		BT_CONTROL(BT_CLR_RD_PTR);	/* reset the queue */
		i = read_all_bytes(bt);
		BT_CONTROL(BT_H_BUSY);		/* clear */
		if (!i) break;			/* Try this state again */
		bt->state = BT_STATE_READ_END;
		return SI_SM_CALL_WITHOUT_DELAY;	/* for logging */

    	case BT_STATE_READ_END:

		/* I could wait on BT_H_BUSY to go clear for a truly clean
		   exit.  However, this is already done in XACTION_START
		   and the (possible) extra loop/status/possible wait affects
		   performance.  So, as long as it works, just ignore H_BUSY */

#ifdef MAKE_THIS_TRUE_IF_NECESSARY

		if (status & BT_H_BUSY) break;
#endif
		bt->seq++;
		bt->state = BT_STATE_IDLE;
		return SI_SM_TRANSACTION_COMPLETE;

	case BT_STATE_RESET1:
    		reset_flags(bt);
    		bt->timeout = BT_RESET_DELAY;
		bt->state = BT_STATE_RESET2;
		break;

	case BT_STATE_RESET2:		/* Send a soft reset */
		BT_CONTROL(BT_CLR_WR_PTR);
		HOST2BMC(3);		/* number of bytes following */
		HOST2BMC(0x18);		/* NetFn/LUN == Application, LUN 0 */
		HOST2BMC(42);		/* Sequence number */
		HOST2BMC(3);		/* Cmd == Soft reset */
		BT_CONTROL(BT_H2B_ATN);
		bt->state = BT_STATE_RESET3;
		break;

	case BT_STATE_RESET3:
		if (bt->timeout > 0) return SI_SM_CALL_WITH_DELAY;
		bt->state = BT_STATE_RESTART;	/* printk in debug modes */
		break;

	case BT_STATE_RESTART:		/* don't reset retries! */
		bt->write_data[2] = ++bt->seq;
		bt->read_count = 0;
		bt->nonzero_status = 0;
		bt->timeout = BT_NORMAL_TIMEOUT;
		bt->state = BT_STATE_XACTION_START;
		break;

	default:	/* HOSED is supposed to be caught much earlier */
		error_recovery(bt, "internal logic error");
		break;
  	}
  	return SI_SM_CALL_WITH_DELAY;
}
示例#7
0
/*
 * Portions Copyright 2011 VMware, Inc.
 */
static int bt_detect(struct si_sm_data *bt)
{
	/*
	 * It's impossible for the BT status and interrupt registers to be
	 * all 1's, (assuming a properly functioning, self-initialized BMC)
	 * but that's what you get from reading a bogus address, so we
	 * test that first.  The calling routine uses negative logic.
	 */

	unsigned char bt_status = BT_STATUS;
	unsigned char bt_intmask = BT_INTMASK_R;

	if ((bt_status == 0xFF) || (bt_intmask == 0xFF)) {
		if (bt_debug) {
			printk(KERN_WARNING "IPMI BT: BT__STATUS or BT_MASK is invalid: %d, %d\n",
			       bt_status, bt_intmask);
		}
		return 1;
	}

	/*
	 * Test the R/W bits on the BT interface to ascertain if the device is
	 * truly available. These bits the host to device clear read bit and clear write
	 * bit, bit 0 and 1 on the BT_CNTL register and bit 7 the h/w reset bit of the
	 * BT_INTMASK register.  The R/W bits should return 0 when read
	 */
	if (bt_status & (BT_CLR_WR_PTR | BT_CLR_RD_PTR)) {
		if (bt_debug) {
			printk(KERN_WARNING "IPMI BT: BT_CLR_WR_PTR or BT_CLR_RD_PTR are not 0: %d, %d\n",
			      (bt_status & BT_CLR_WR_PTR), (bt_status & BT_CLR_WR_PTR));
		}
		return 1;
	}

	if(bt_intmask & BT_BMC_HWRST) {
		if (bt_debug) {
			printk(KERN_WARNING "IPMI BT: BT_BMC_HWRST is not 0: %d\n",
			      (bt_intmask & BT_BMC_HWRST));
		}
		return 1;
	}

	/*
	 * The H_BUSY (bit 6) of the BT_CNTL register works as a toggle bit, with
	 * the state of the bit toggling if a 1 is written. No change is seen if 0 is
	 * written. This bit is toggled to further verify the presence of the BT interface
	 */

	// Toggle bit
	BT_CONTROL(BT_H_BUSY);
	if (!((bt_status ^ BT_STATUS) & BT_H_BUSY)) {
		if (bt_debug) {
			printk(KERN_WARNING "IPMI BT: Unable to toggle BT_H_BUSY once\n");
		}
		return 1;
	}
	//Toggle again
	BT_CONTROL(BT_H_BUSY);
	if ((bt_status ^ BT_STATUS) & BT_H_BUSY) {
		if (bt_debug) {
			printk(KERN_WARNING "IPMI BT: Unable to toggle BT_H_BUSY twice\n");
		}
		return 1;
	}

	reset_flags(bt);
	return 0;

}
示例#8
0
static enum si_sm_result bt_event(struct si_sm_data *bt, long time)
{
	unsigned char status, BT_CAP[8];
	static enum bt_states last_printed = BT_STATE_PRINTME;
	int i;

	status = BT_STATUS;
	bt->nonzero_status |= status;
	if ((bt_debug & BT_DEBUG_STATES) && (bt->state != last_printed)) {
		printk(KERN_WARNING "BT: %s %s TO=%ld - %ld \n",
			STATE2TXT,
			STATUS2TXT,
			bt->timeout,
			time);
		last_printed = bt->state;
	}

	/*
	 * Commands that time out may still (eventually) provide a response.
	 * This stale response will get in the way of a new response so remove
	 * it if possible (hopefully during IDLE).  Even if it comes up later
	 * it will be rejected by its (now-forgotten) seq number.
	 */

	if ((bt->state < BT_STATE_WRITE_BYTES) && (status & BT_B2H_ATN)) {
		drain_BMC2HOST(bt);
		BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
	}

	if ((bt->state != BT_STATE_IDLE) &&
	    (bt->state <  BT_STATE_PRINTME)) {
		/* check timeout */
		bt->timeout -= time;
		if ((bt->timeout < 0) && (bt->state < BT_STATE_RESET1))
			return error_recovery(bt,
					      status,
					      IPMI_TIMEOUT_ERR);
	}

	switch (bt->state) {

	/*
	 * Idle state first checks for asynchronous messages from another
	 * channel, then does some opportunistic housekeeping.
	 */

	case BT_STATE_IDLE:
		if (status & BT_SMS_ATN) {
			BT_CONTROL(BT_SMS_ATN);	/* clear it */
			return SI_SM_ATTN;
		}

		if (status & BT_H_BUSY)		/* clear a leftover H_BUSY */
			BT_CONTROL(BT_H_BUSY);

		/* Read BT capabilities if it hasn't been done yet */
		if (!bt->BT_CAP_outreqs)
			BT_STATE_CHANGE(BT_STATE_CAPABILITIES_BEGIN,
					SI_SM_CALL_WITHOUT_DELAY);
		bt->timeout = bt->BT_CAP_req2rsp;
		BT_SI_SM_RETURN(SI_SM_IDLE);

	case BT_STATE_XACTION_START:
		if (status & (BT_B_BUSY | BT_H2B_ATN))
			BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
		if (BT_STATUS & BT_H_BUSY)
			BT_CONTROL(BT_H_BUSY);	/* force clear */
		BT_STATE_CHANGE(BT_STATE_WRITE_BYTES,
				SI_SM_CALL_WITHOUT_DELAY);

	case BT_STATE_WRITE_BYTES:
		if (status & BT_H_BUSY)
			BT_CONTROL(BT_H_BUSY);	/* clear */
		BT_CONTROL(BT_CLR_WR_PTR);
		write_all_bytes(bt);
		BT_CONTROL(BT_H2B_ATN);	/* can clear too fast to catch */
		BT_STATE_CHANGE(BT_STATE_WRITE_CONSUME,
				SI_SM_CALL_WITHOUT_DELAY);

	case BT_STATE_WRITE_CONSUME:
		if (status & (BT_B_BUSY | BT_H2B_ATN))
			BT_SI_SM_RETURN(SI_SM_CALL_WITH_DELAY);
		BT_STATE_CHANGE(BT_STATE_READ