path: root/drivers/scsi/libsas/sas_scsi_host.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Serial Attached SCSI (SAS) class SCSI Host glue.
 *
 * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
 */

#include <linux/kthread.h>
#include <linux/firmware.h>
#include <linux/export.h>
#include <linux/ctype.h>
#include <linux/kernel.h>

#include "sas_internal.h"

#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>
#include <scsi/sas_ata.h>
#include "scsi_sas_internal.h"
#include "scsi_transport_api.h"
#include "scsi_priv.h"

#include <linux/err.h>
#include <linux/blkdev.h>
#include <linux/freezer.h>
#include <linux/gfp.h>
#include <linux/scatterlist.h>
#include <linux/libata.h>

/* record final status and free the task */
static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
{
	struct task_status_struct *ts = &task->task_status;
	enum scsi_host_status hs = DID_OK;
	enum exec_status stat = SAS_SAM_STAT_GOOD;

	if (ts->resp == SAS_TASK_UNDELIVERED) {
		/* transport error */
		hs = DID_NO_CONNECT;
	} else { /* ts->resp == SAS_TASK_COMPLETE */
		/* task delivered, what happened afterwards? */
		switch (ts->stat) {
		case SAS_DEV_NO_RESPONSE:
		case SAS_INTERRUPTED:
		case SAS_PHY_DOWN:
		case SAS_NAK_R_ERR:
		case SAS_OPEN_TO:
			hs = DID_NO_CONNECT;
			break;
		case SAS_DATA_UNDERRUN:
			scsi_set_resid(sc, ts->residual);
			if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
				hs = DID_ERROR;
			break;
		case SAS_DATA_OVERRUN:
			hs = DID_ERROR;
			break;
		case SAS_QUEUE_FULL:
			hs = DID_SOFT_ERROR; /* retry */
			break;
		case SAS_DEVICE_UNKNOWN:
			hs = DID_BAD_TARGET;
			break;
		case SAS_OPEN_REJECT:
			if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
				hs = DID_SOFT_ERROR; /* retry */
			else
				hs = DID_ERROR;
			break;
		case SAS_PROTO_RESPONSE:
			pr_notice("LLDD:%s sent SAS_PROTO_RESP for an SSP task; please report this\n",
				  task->dev->port->ha->sas_ha_name);
			break;
		case SAS_ABORTED_TASK:
			hs = DID_ABORT;
			break;
		case SAS_SAM_STAT_CHECK_CONDITION:
			memcpy(sc->sense_buffer, ts->buf,
			       min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
			stat = SAS_SAM_STAT_CHECK_CONDITION;
			break;
		default:
			stat = ts->stat;
			break;
		}
	}

	sc->result = (hs << 16) | stat;
	ASSIGN_SAS_TASK(sc, NULL);
	sas_free_task(task);
}

static void sas_scsi_task_done(struct sas_task *task)
{
	struct scsi_cmnd *sc = task->uldd_task;
	struct domain_device *dev = task->dev;
	struct sas_ha_struct *ha = dev->port->ha;
	unsigned long flags;

	spin_lock_irqsave(&dev->done_lock, flags);
	if (test_bit(SAS_HA_FROZEN, &ha->state))
		task = NULL;
	else
		ASSIGN_SAS_TASK(sc, NULL);
	spin_unlock_irqrestore(&dev->done_lock, flags);

	if (unlikely(!task)) {
		/* task will be completed by the error handler */
		pr_debug("task done but aborted\n");
		return;