fas216.c

linux-2.6.15.6

static void
fas216_devicereset_done(FAS216_Info *info, Scsi_Cmnd *SCpnt, unsigned int result)
{
	fas216_log(info, LOG_ERROR, "fas216 device reset complete");

	info->rstSCpnt = NULL;
	info->rst_dev_status = 1;
	wake_up(&info->eh_wait);
}

/**
 * fas216_rq_sns_done - Finish processing automatic request sense command
 * @info: interface that completed
 * @SCpnt: command that completed
 * @result: driver byte of result
 *
 * Finish processing automatic request sense command
 */
static void
fas216_rq_sns_done(FAS216_Info *info, Scsi_Cmnd *SCpnt, unsigned int result)
{
	fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
		   "request sense complete, result=0x%04x%02x%02x",
		   result, SCpnt->SCp.Message, SCpnt->SCp.Status);

	if (result != DID_OK || SCpnt->SCp.Status != GOOD)
		/*
		 * Something went wrong.  Make sure that we don't
		 * have valid data in the sense buffer that could
		 * confuse the higher levels.
		 */
		memset(SCpnt->sense_buffer, 0, sizeof(SCpnt->sense_buffer));
//printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
//{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
	/*
	 * Note that we don't set SCpnt->result, since that should
	 * reflect the status of the command that we were asked by
	 * the upper layers to process.  This would have been set
	 * correctly by fas216_std_done.
	 */
	SCpnt->scsi_done(SCpnt);
}

/**
 * fas216_std_done - finish processing of standard command
 * @info: interface that completed
 * @SCpnt: command that completed
 * @result: driver byte of result
 *
 * Finish processing of standard command
 */
static void
fas216_std_done(FAS216_Info *info, Scsi_Cmnd *SCpnt, unsigned int result)
{
	info->stats.fins += 1;

	SCpnt->result = result << 16 | info->scsi.SCp.Message << 8 |
			info->scsi.SCp.Status;

	fas216_log_command(info, LOG_CONNECT, SCpnt,
		"command complete, result=0x%08x", SCpnt->result);

	/*
	 * If the driver detected an error, we're all done.
	 */
	if (host_byte(SCpnt->result) != DID_OK ||
	    msg_byte(SCpnt->result) != COMMAND_COMPLETE)
		goto done;

	/*
	 * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
	 * status, request the sense information.
	 */
	if (status_byte(SCpnt->result) == CHECK_CONDITION ||
	    status_byte(SCpnt->result) == COMMAND_TERMINATED)
		goto request_sense;

	/*
	 * If the command did not complete with GOOD status,
	 * we are all done here.
	 */
	if (status_byte(SCpnt->result) != GOOD)
		goto done;

	/*
	 * We have successfully completed a command.  Make sure that
	 * we do not have any buffers left to transfer.  The world
	 * is not perfect, and we seem to occasionally hit this.
	 * It can be indicative of a buggy driver, target or the upper
	 * levels of the SCSI code.
	 */
	if (info->scsi.SCp.ptr) {
		switch (SCpnt->cmnd[0]) {
		case INQUIRY:
		case START_STOP:
		case MODE_SENSE:
			break;

		default:
			printk(KERN_ERR "scsi%d.%c: incomplete data transfer "
				"detected: res=%08X ptr=%p len=%X CDB: ",
				info->host->host_no, '0' + SCpnt->device->id,
				SCpnt->result, info->scsi.SCp.ptr,
				info->scsi.SCp.this_residual);
			__scsi_print_command(SCpnt->cmnd);
			SCpnt->result &= ~(255 << 16);
			SCpnt->result |= DID_BAD_TARGET << 16;
			goto request_sense;
		}
	}

done:
	if (SCpnt->scsi_done) {
		SCpnt->scsi_done(SCpnt);
		return;
	}

	panic("scsi%d.H: null scsi_done function in fas216_done",
		info->host->host_no);


request_sense:
	if (SCpnt->cmnd[0] == REQUEST_SENSE)
		goto done;

	fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
			  "requesting sense");
	memset(SCpnt->cmnd, 0, sizeof (SCpnt->cmnd));
	SCpnt->cmnd[0] = REQUEST_SENSE;
	SCpnt->cmnd[1] = SCpnt->device->lun << 5;
	SCpnt->cmnd[4] = sizeof(SCpnt->sense_buffer);
	SCpnt->cmd_len = COMMAND_SIZE(SCpnt->cmnd[0]);
	SCpnt->SCp.buffer = NULL;
	SCpnt->SCp.buffers_residual = 0;
	SCpnt->SCp.ptr = (char *)SCpnt->sense_buffer;
	SCpnt->SCp.this_residual = sizeof(SCpnt->sense_buffer);
	SCpnt->SCp.Message = 0;
	SCpnt->SCp.Status = 0;
	SCpnt->request_bufflen = sizeof(SCpnt->sense_buffer);
	SCpnt->sc_data_direction = DMA_FROM_DEVICE;
	SCpnt->use_sg = 0;
	SCpnt->tag = 0;
	SCpnt->host_scribble = (void *)fas216_rq_sns_done;

	/*
	 * Place this command into the high priority "request
	 * sense" slot.  This will be the very next command
	 * executed, unless a target connects to us.
	 */
	if (info->reqSCpnt)
		printk(KERN_WARNING "scsi%d.%c: loosing request command\n",
			info->host->host_no, '0' + SCpnt->device->id);
	info->reqSCpnt = SCpnt;
}

/**
 * fas216_done - complete processing for current command
 * @info: interface that completed
 * @result: driver byte of result
 *
 * Complete processing for current command
 */
static void fas216_done(FAS216_Info *info, unsigned int result)
{
	void (*fn)(FAS216_Info *, Scsi_Cmnd *, unsigned int);
	Scsi_Cmnd *SCpnt;
	unsigned long flags;

	fas216_checkmagic(info);

	if (!info->SCpnt)
		goto no_command;

	SCpnt = info->SCpnt;
	info->SCpnt = NULL;
    	info->scsi.phase = PHASE_IDLE;

	if (info->scsi.aborting) {
		fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
		result = DID_ABORT;
		info->scsi.aborting = 0;
	}

	/*
	 * Sanity check the completion - if we have zero bytes left
	 * to transfer, we should not have a valid pointer.
	 */
	if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
		printk("scsi%d.%c: zero bytes left to transfer, but "
		       "buffer pointer still valid: ptr=%p len=%08x CDB: ",
		       info->host->host_no, '0' + SCpnt->device->id,
		       info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
		info->scsi.SCp.ptr = NULL;
		__scsi_print_command(SCpnt->cmnd);
	}

	/*
	 * Clear down this command as completed.  If we need to request
	 * the sense information, fas216_kick will re-assert the busy
	 * status.
	 */
	info->device[SCpnt->device->id].parity_check = 0;
	clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns);

	fn = (void (*)(FAS216_Info *, Scsi_Cmnd *, unsigned int))SCpnt->host_scribble;
	fn(info, SCpnt, result);

	if (info->scsi.irq != NO_IRQ) {
		spin_lock_irqsave(&info->host_lock, flags);
		if (info->scsi.phase == PHASE_IDLE)
			fas216_kick(info);
		spin_unlock_irqrestore(&info->host_lock, flags);
	}
	return;

no_command:
	panic("scsi%d.H: null command in fas216_done",
		info->host->host_no);
}

/**
 * fas216_queue_command - queue a command for adapter to process.
 * @SCpnt: Command to queue
 * @done: done function to call once command is complete
 *
 * Queue a command for adapter to process.
 * Returns: 0 on success, else error.
 * Notes: io_request_lock is held, interrupts are disabled.
 */
int fas216_queue_command(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
{
	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
	int result;

	fas216_checkmagic(info);

	fas216_log_command(info, LOG_CONNECT, SCpnt,
			   "received command (%p)", SCpnt);

	SCpnt->scsi_done = done;
	SCpnt->host_scribble = (void *)fas216_std_done;
	SCpnt->result = 0;

	init_SCp(SCpnt);

	info->stats.queues += 1;
	SCpnt->tag = 0;

	spin_lock(&info->host_lock);

	/*
	 * Add command into execute queue and let it complete under
	 * whatever scheme we're using.
	 */
	result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);

	/*
	 * If we successfully added the command,
	 * kick the interface to get it moving.
	 */
	if (result == 0 && info->scsi.phase == PHASE_IDLE)
		fas216_kick(info);
	spin_unlock(&info->host_lock);

	fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
		result ? "failure" : "success");

	return result;
}

/**
 * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
 * @SCpnt: Command to wake
 *
 * Trigger restart of a waiting thread in fas216_command
 */
static void fas216_internal_done(Scsi_Cmnd *SCpnt)
{
	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;

	fas216_checkmagic(info);

	info->internal_done = 1;
}

/**
 * fas216_noqueue_command - process a command for the adapter.
 * @SCpnt: Command to queue
 *
 * Queue a command for adapter to process.
 * Returns: scsi result code.
 * Notes: io_request_lock is held, interrupts are disabled.
 */
int fas216_noqueue_command(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
{
	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;

	fas216_checkmagic(info);

	/*
	 * We should only be using this if we don't have an interrupt.
	 * Provide some "incentive" to use the queueing code.
	 */
	BUG_ON(info->scsi.irq != NO_IRQ);

	info->internal_done = 0;
	fas216_queue_command(SCpnt, fas216_internal_done);

	/*
	 * This wastes time, since we can't return until the command is
	 * complete. We can't sleep either since we may get re-entered!
	 * However, we must re-enable interrupts, or else we'll be
	 * waiting forever.
	 */
	spin_unlock_irq(info->host->host_lock);

	while (!info->internal_done) {
		/*
		 * If we don't have an IRQ, then we must poll the card for
		 * it's interrupt, and use that to call this driver's
		 * interrupt routine.  That way, we keep the command
		 * progressing.  Maybe we can add some inteligence here
		 * and go to sleep if we know that the device is going
		 * to be some time (eg, disconnected).
		 */
		if (fas216_readb(info, REG_STAT) & STAT_INT) {
			spin_lock_irq(info->host->host_lock);
			fas216_intr(info);
			spin_unlock_irq(info->host->host_lock);
		}
	}

	spin_lock_irq(info->host->host_lock);

	done(SCpnt);

	return 0;
}

/*
 * Error handler timeout function.  Indicate that we timed out,
 * and wake up any error handler process so it can continue.
 */
static void fas216_eh_timer(unsigned long data)
{
	FAS216_Info *info = (FAS216_Info *)data;

	fas216_log(info, LOG_ERROR, "error handling timed out\n");

	del_timer(&info->eh_timer);

	if (info->rst_bus_status == 0)
		info->rst_bus_status = -1;
	if (info->rst_dev_status == 0)
		info->rst_dev_status = -1;

	wake_up(&info->eh_wait);
}

enum res_find {
	res_failed,		/* not found			*/
	res_success,		/* command on issue queue	*/
	res_hw_abort		/* command on disconnected dev	*/
};

/**
 * fas216_do_abort - decide how to abort a command
 * @SCpnt: command to abort
 *
 * Decide how to abort a command.
 * Returns: abort status
 */
static enum res_find fas216_find_command(FAS216_Info *info, Scsi_Cmnd *SCpnt)
{
	enum res_find res = res_failed;

	if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
		/*
		 * The command was on the issue queue, and has not been
		 * issued yet.  We can remove the command from the queue,
		 * and acknowledge the abort.  Neither the device nor the
		 * interface know about the command.
		 */
		printk("on issue queue ");

		res = res_success;
	} else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
		/*
		 * The command was on the disconnected queue.  We must
		 * reconnect with the device if possible, and send it
		 * an abort message.
		 */
		printk("on disconnected queue ");

		res = res_hw_abort;
	} else if (info->SCpnt == SCpnt) {
		printk("executing ");

		switch (info->scsi.phase) {
		/*
		 * If the interface is idle, and the command is 'disconnectable',
		 * then it is the same as on the disconnected queue.
		 */
		case PHASE_IDLE:
			if (info->scsi.disconnectable) {
				info->scsi.disconnectable = 0;
				info->SCpnt = NULL;
				res = res_hw_abort;
			}
			break;

		default:
			break;
		}
	} else if (info->origSCpnt == SCpnt) {
		/*
		 * The command will be executed next, but a command
		 * is currently using the interface.  This is similar to
		 * being on the issue queue, except the busylun bit has
		 * been set.
		 */
		info->origSCpnt = NULL;
		clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, info->busyluns);
		printk("waiting for execution ");
		res = res_success;
	} else
		printk("unknown ");

	return res;
}

/**
 * fas216_eh_abort - abort this command
 * @SCpnt: command to abort
 *
 * Abort this command.
 * Returns: FAILED if unable to abort
 * Notes: io_request_lock is taken, and irqs are disabled
 */
int fas216_eh_abort(Scsi_Cmnd *SCpnt)
{
	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
	int result = FAILED;

	fas216_checkmagic(info);

	info->stats.aborts += 1;

	printk(KERN_WARNING "scsi%d: abort command ", info->host->host_no);
	__scsi_print_command(SCpnt->data_cmnd);

	print_debug_list();
	fas216_dumpstate(info);

	printk(KERN_WARNING "scsi%d: abort %p ", info->host->host_no, SCpnt);

	switch (fas216_find_command(info, SCpnt)) {
	/*
	 * We found the command, and cleared it out.  Either
	 * the command is still known to be executing on the
	 * target, or the busylun bit is not set.
	 */
	case res_success:
		printk("success\n");
		result = SUCCESS;
		break;

	/*
	 * We need to reconnect to the target and send it an
	 * ABORT or ABORT_TAG message.  We can only do this
	 * if the bus is free.
	 */
	case res_hw_abort:
		

	/*
	 * We are unable to abort the command for some reason.
	 */
	default:
	case res_failed:
		printk("failed\n");
		break;
	}

	return result;
}

/**
 * fas216_eh_device_reset - Reset the device associated with this command
 * @SCpnt: command specifing device to reset
 *
 * Reset the device associated with this command.
 * Returns: FAILED if unable to reset.
 * Notes: We won't be re-entered, so we'll only