aiclib.c

h内核

			  &sense_entry,
			  &asc_entry);

	*sense_key_desc = sense_entry->desc;

	if (asc_entry != NULL)
		*asc_desc = asc_entry->desc;
	else if (asc >= 0x80 && asc <= 0xff)
		*asc_desc = "Vendor Specific ASC";
	else if (ascq >= 0x80 && ascq <= 0xff)
		*asc_desc = "Vendor Specific ASCQ";
	else
		*asc_desc = "Reserved ASC/ASCQ pair";
}

/*
 * Given sense and device type information, return the appropriate action.
 * If we do not understand the specific error as identified by the ASC/ASCQ
 * pair, fall back on the more generic actions derived from the sense key.
 */
aic_sense_action
aic_sense_error_action(struct scsi_sense_data *sense_data,
		       struct scsi_inquiry_data *inq_data, uint32_t sense_flags)
{
	const struct asc_table_entry *asc_entry;
	const struct sense_key_table_entry *sense_entry;
	int error_code, sense_key, asc, ascq;
	aic_sense_action action;

	scsi_extract_sense(sense_data, &error_code, &sense_key, &asc, &ascq);

	if (error_code == SSD_DEFERRED_ERROR) {
		/*
		 * XXX [e-mail]
		 * This error doesn't relate to the command associated
		 * with this request sense.  A deferred error is an error
		 * for a command that has already returned GOOD status
		 * (see SCSI2 8.2.14.2).
		 *
		 * By my reading of that section, it looks like the current
		 * command has been cancelled, we should now clean things up
		 * (hopefully recovering any lost data) and then retry the
		 * current command.  There are two easy choices, both wrong:
		 *
		 * 1. Drop through (like we had been doing), thus treating
		 *    this as if the error were for the current command and
		 *    return and stop the current command.
		 * 
		 * 2. Issue a retry (like I made it do) thus hopefully
		 *    recovering the current transfer, and ignoring the
		 *    fact that we've dropped a command.
		 *
		 * These should probably be handled in a device specific
		 * sense handler or punted back up to a user mode daemon
		 */
		action = SS_RETRY|SSQ_DECREMENT_COUNT|SSQ_PRINT_SENSE;
	} else {
		fetchtableentries(sense_key, asc, ascq,
				  inq_data,
				  &sense_entry,
				  &asc_entry);

		/*
		 * Override the 'No additional Sense' entry (0,0)
		 * with the error action of the sense key.
		 */
		if (asc_entry != NULL
		 && (asc != 0 || ascq != 0))
			action = asc_entry->action;
		else
			action = sense_entry->action;

		if (sense_key == SSD_KEY_RECOVERED_ERROR) {
			/*
			 * The action succeeded but the device wants
			 * the user to know that some recovery action
			 * was required.
			 */
			action &= ~(SS_MASK|SSQ_MASK|SS_ERRMASK);
			action |= SS_NOP|SSQ_PRINT_SENSE;
		} else if (sense_key == SSD_KEY_ILLEGAL_REQUEST) {
			if ((sense_flags & SF_QUIET_IR) != 0)
				action &= ~SSQ_PRINT_SENSE;
		} else if (sense_key == SSD_KEY_UNIT_ATTENTION) {
			if ((sense_flags & SF_RETRY_UA) != 0
			 && (action & SS_MASK) == SS_FAIL) {
				action &= ~(SS_MASK|SSQ_MASK);
				action |= SS_RETRY|SSQ_DECREMENT_COUNT|
					  SSQ_PRINT_SENSE;
			}
		}
	}

	if ((sense_flags & SF_PRINT_ALWAYS) != 0)
		action |= SSQ_PRINT_SENSE;
	else if ((sense_flags & SF_NO_PRINT) != 0)
		action &= ~SSQ_PRINT_SENSE;

	return (action);
}

/*      
 * Try make as good a match as possible with
 * available sub drivers
 */
int
aic_inquiry_match(caddr_t inqbuffer, caddr_t table_entry)
{
	struct scsi_inquiry_pattern *entry;
	struct scsi_inquiry_data *inq;
 
	entry = (struct scsi_inquiry_pattern *)table_entry;
	inq = (struct scsi_inquiry_data *)inqbuffer;

	if (((SID_TYPE(inq) == entry->type)
	  || (entry->type == T_ANY))
	 && (SID_IS_REMOVABLE(inq) ? entry->media_type & SIP_MEDIA_REMOVABLE
				   : entry->media_type & SIP_MEDIA_FIXED)
	 && (cam_strmatch(inq->vendor, entry->vendor, sizeof(inq->vendor)) == 0)
	 && (cam_strmatch(inq->product, entry->product,
			  sizeof(inq->product)) == 0)
	 && (cam_strmatch(inq->revision, entry->revision,
			  sizeof(inq->revision)) == 0)) {
		return (0);
	}
        return (-1);
}

/*
 * Table of syncrates that don't follow the "divisible by 4"
 * rule. This table will be expanded in future SCSI specs.
 */
static struct {
	u_int period_factor;
	u_int period;	/* in 100ths of ns */
} scsi_syncrates[] = {
	{ 0x08, 625 },	/* FAST-160 */
	{ 0x09, 1250 },	/* FAST-80 */
	{ 0x0a, 2500 },	/* FAST-40 40MHz */
	{ 0x0b, 3030 },	/* FAST-40 33MHz */
	{ 0x0c, 5000 }	/* FAST-20 */
};

/*
 * Return the frequency in kHz corresponding to the given
 * sync period factor.
 */
u_int
aic_calc_syncsrate(u_int period_factor)
{
	int i;
	int num_syncrates;

	num_syncrates = sizeof(scsi_syncrates) / sizeof(scsi_syncrates[0]);
	/* See if the period is in the "exception" table */
	for (i = 0; i < num_syncrates; i++) {

		if (period_factor == scsi_syncrates[i].period_factor) {
			/* Period in kHz */
			return (100000000 / scsi_syncrates[i].period);
		}
	}

	/*
	 * Wasn't in the table, so use the standard
	 * 4 times conversion.
	 */
	return (10000000 / (period_factor * 4 * 10));
}

/*
 * Return speed in KB/s.
 */
u_int
aic_calc_speed(u_int width, u_int period, u_int offset, u_int min_rate)
{
	u_int freq;

	if (offset != 0 && period < min_rate)
		freq  = aic_calc_syncsrate(period);
	else
		/* Roughly 3.3MB/s for async */
		freq  = 3300;
	freq <<= width;
	return (freq);
}

uint32_t
aic_error_action(struct scsi_cmnd *cmd, struct scsi_inquiry_data *inq_data,
		 cam_status status, u_int scsi_status)
{
	aic_sense_action  err_action;
	int		  sense;

	sense  = (cmd->result >> 24) == DRIVER_SENSE;

	switch (status) {
	case CAM_REQ_CMP:
		err_action = SS_NOP;
		break;
	case CAM_AUTOSENSE_FAIL:
	case CAM_SCSI_STATUS_ERROR:

		switch (scsi_status) {
		case SCSI_STATUS_OK:
		case SCSI_STATUS_COND_MET:
		case SCSI_STATUS_INTERMED:
		case SCSI_STATUS_INTERMED_COND_MET:
			err_action = SS_NOP;
			break;
		case SCSI_STATUS_CMD_TERMINATED:
		case SCSI_STATUS_CHECK_COND:
			if (sense != 0) {
				struct scsi_sense_data *sense;

				sense = (struct scsi_sense_data *)
				    &cmd->sense_buffer;
				err_action =
				    aic_sense_error_action(sense, inq_data, 0);

			} else {
				err_action = SS_RETRY|SSQ_FALLBACK
					   | SSQ_DECREMENT_COUNT|EIO;
			}
			break;
		case SCSI_STATUS_QUEUE_FULL:
		case SCSI_STATUS_BUSY:
			err_action = SS_RETRY|SSQ_DELAY|SSQ_MANY
				   | SSQ_DECREMENT_COUNT|EBUSY;
			break;
		case SCSI_STATUS_RESERV_CONFLICT:
		default:
			err_action = SS_FAIL|EBUSY;
			break;
		}
		break;
	case CAM_CMD_TIMEOUT:
	case CAM_REQ_CMP_ERR:
	case CAM_UNEXP_BUSFREE:
	case CAM_UNCOR_PARITY:
	case CAM_DATA_RUN_ERR:
		err_action = SS_RETRY|SSQ_FALLBACK|EIO;
		break;
	case CAM_UA_ABORT:
	case CAM_UA_TERMIO:
	case CAM_MSG_REJECT_REC:
	case CAM_SEL_TIMEOUT:
		err_action = SS_FAIL|EIO;
		break;
	case CAM_REQ_INVALID:
	case CAM_PATH_INVALID:
	case CAM_DEV_NOT_THERE:
	case CAM_NO_HBA:
	case CAM_PROVIDE_FAIL:
	case CAM_REQ_TOO_BIG:		
	case CAM_RESRC_UNAVAIL:
	case CAM_BUSY:
	default:
		/* panic??  These should never occur in our application. */
		err_action = SS_FAIL|EIO;
		break;
	case CAM_SCSI_BUS_RESET:
	case CAM_BDR_SENT:		
	case CAM_REQUEUE_REQ:
		/* Unconditional requeue */
		err_action = SS_RETRY;
		break;
	}

	return (err_action);
}

char *
aic_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
		       aic_option_callback_t *callback, u_long callback_arg)
{
	char	*tok_end;
	char	*tok_end2;
	int      i;
	int      instance;
	int	 targ;
	int	 done;
	char	 tok_list[] = {'.', ',', '{', '}', '\0'};

	/* All options use a ':' name/arg separator */
	if (*opt_arg != ':')
		return (opt_arg);
	opt_arg++;
	instance = -1;
	targ = -1;
	done = FALSE;
	/*
	 * Restore separator that may be in
	 * the middle of our option argument.
	 */
	tok_end = strchr(opt_arg, '\0');
	if (tok_end < end)
		*tok_end = ',';
	while (!done) {
		switch (*opt_arg) {
		case '{':
			if (instance == -1) {
				instance = 0;
			} else {
				if (depth > 1) {
					if (targ == -1)
						targ = 0;
				} else {
					printf("Malformed Option %s\n",
					       opt_name);
					done = TRUE;
				}
			}
			opt_arg++;
			break;
		case '}':
			if (targ != -1)
				targ = -1;
			else if (instance != -1)
				instance = -1;
			opt_arg++;
			break;
		case ',':
		case '.':
			if (instance == -1)
				done = TRUE;
			else if (targ >= 0)
				targ++;
			else if (instance >= 0)
				instance++;
			opt_arg++;
			break;
		case '\0':
			done = TRUE;
			break;
		default:
			tok_end = end;
			for (i = 0; tok_list[i]; i++) {
				tok_end2 = strchr(opt_arg, tok_list[i]);
				if ((tok_end2) && (tok_end2 < tok_end))
					tok_end = tok_end2;
			}
			callback(callback_arg, instance, targ,
				 simple_strtol(opt_arg, NULL, 0));
			opt_arg = tok_end;
			break;
		}
	}
	return (opt_arg);
}