![Christoph Hellwig](/assets/img/avatar_default.png)
Avoid taking the host-wide host_lock to check the per-host queue limit. Instead we do an atomic_inc_return early on to grab our slot in the queue, and if necessary decrement it after finishing all checks. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Webb Scales <webbnh@hp.com> Acked-by: Jens Axboe <axboe@kernel.dk> Tested-by: Bart Van Assche <bvanassche@acm.org> Tested-by: Robert Elliott <elliott@hp.com>
1223 lines
31 KiB
C
1223 lines
31 KiB
C
/*
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* Serial Attached SCSI (SAS) class SCSI Host glue.
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*
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* Copyright (C) 2005 Adaptec, Inc. All rights reserved.
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* Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
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*
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* This file is licensed under GPLv2.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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*/
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#include <linux/kthread.h>
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#include <linux/firmware.h>
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#include <linux/export.h>
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#include <linux/ctype.h>
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#include "sas_internal.h"
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_transport.h>
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#include <scsi/scsi_transport_sas.h>
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#include <scsi/sas_ata.h>
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#include "../scsi_sas_internal.h"
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#include "../scsi_transport_api.h"
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#include "../scsi_priv.h"
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#include <linux/err.h>
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#include <linux/blkdev.h>
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#include <linux/freezer.h>
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#include <linux/gfp.h>
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#include <linux/scatterlist.h>
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#include <linux/libata.h>
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/* record final status and free the task */
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static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
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{
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struct task_status_struct *ts = &task->task_status;
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int hs = 0, stat = 0;
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if (ts->resp == SAS_TASK_UNDELIVERED) {
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/* transport error */
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hs = DID_NO_CONNECT;
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} else { /* ts->resp == SAS_TASK_COMPLETE */
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/* task delivered, what happened afterwards? */
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switch (ts->stat) {
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case SAS_DEV_NO_RESPONSE:
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case SAS_INTERRUPTED:
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case SAS_PHY_DOWN:
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case SAS_NAK_R_ERR:
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case SAS_OPEN_TO:
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hs = DID_NO_CONNECT;
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break;
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case SAS_DATA_UNDERRUN:
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scsi_set_resid(sc, ts->residual);
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if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
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hs = DID_ERROR;
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break;
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case SAS_DATA_OVERRUN:
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hs = DID_ERROR;
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break;
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case SAS_QUEUE_FULL:
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hs = DID_SOFT_ERROR; /* retry */
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break;
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case SAS_DEVICE_UNKNOWN:
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hs = DID_BAD_TARGET;
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break;
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case SAS_SG_ERR:
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hs = DID_PARITY;
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break;
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case SAS_OPEN_REJECT:
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if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
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hs = DID_SOFT_ERROR; /* retry */
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else
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hs = DID_ERROR;
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break;
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case SAS_PROTO_RESPONSE:
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SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
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"task; please report this\n",
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task->dev->port->ha->sas_ha_name);
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break;
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case SAS_ABORTED_TASK:
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hs = DID_ABORT;
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break;
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case SAM_STAT_CHECK_CONDITION:
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memcpy(sc->sense_buffer, ts->buf,
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min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
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stat = SAM_STAT_CHECK_CONDITION;
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break;
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default:
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stat = ts->stat;
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break;
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}
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}
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sc->result = (hs << 16) | stat;
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ASSIGN_SAS_TASK(sc, NULL);
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list_del_init(&task->list);
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sas_free_task(task);
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}
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static void sas_scsi_task_done(struct sas_task *task)
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{
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struct scsi_cmnd *sc = task->uldd_task;
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struct domain_device *dev = task->dev;
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struct sas_ha_struct *ha = dev->port->ha;
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unsigned long flags;
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spin_lock_irqsave(&dev->done_lock, flags);
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if (test_bit(SAS_HA_FROZEN, &ha->state))
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task = NULL;
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else
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ASSIGN_SAS_TASK(sc, NULL);
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spin_unlock_irqrestore(&dev->done_lock, flags);
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if (unlikely(!task)) {
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/* task will be completed by the error handler */
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SAS_DPRINTK("task done but aborted\n");
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return;
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}
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if (unlikely(!sc)) {
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SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
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list_del_init(&task->list);
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sas_free_task(task);
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return;
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}
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sas_end_task(sc, task);
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sc->scsi_done(sc);
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}
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static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
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struct domain_device *dev,
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gfp_t gfp_flags)
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{
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struct sas_task *task = sas_alloc_task(gfp_flags);
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struct scsi_lun lun;
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if (!task)
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return NULL;
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task->uldd_task = cmd;
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ASSIGN_SAS_TASK(cmd, task);
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task->dev = dev;
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task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
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task->ssp_task.retry_count = 1;
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int_to_scsilun(cmd->device->lun, &lun);
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memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
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task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
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task->ssp_task.cmd = cmd;
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task->scatter = scsi_sglist(cmd);
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task->num_scatter = scsi_sg_count(cmd);
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task->total_xfer_len = scsi_bufflen(cmd);
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task->data_dir = cmd->sc_data_direction;
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task->task_done = sas_scsi_task_done;
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return task;
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}
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int sas_queue_up(struct sas_task *task)
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{
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struct sas_ha_struct *sas_ha = task->dev->port->ha;
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struct scsi_core *core = &sas_ha->core;
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unsigned long flags;
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LIST_HEAD(list);
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spin_lock_irqsave(&core->task_queue_lock, flags);
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if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
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spin_unlock_irqrestore(&core->task_queue_lock, flags);
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return -SAS_QUEUE_FULL;
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}
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list_add_tail(&task->list, &core->task_queue);
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core->task_queue_size += 1;
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spin_unlock_irqrestore(&core->task_queue_lock, flags);
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wake_up_process(core->queue_thread);
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return 0;
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}
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int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
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{
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struct sas_internal *i = to_sas_internal(host->transportt);
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struct domain_device *dev = cmd_to_domain_dev(cmd);
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struct sas_ha_struct *sas_ha = dev->port->ha;
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struct sas_task *task;
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int res = 0;
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/* If the device fell off, no sense in issuing commands */
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if (test_bit(SAS_DEV_GONE, &dev->state)) {
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cmd->result = DID_BAD_TARGET << 16;
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goto out_done;
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}
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if (dev_is_sata(dev)) {
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spin_lock_irq(dev->sata_dev.ap->lock);
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res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
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spin_unlock_irq(dev->sata_dev.ap->lock);
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return res;
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}
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task = sas_create_task(cmd, dev, GFP_ATOMIC);
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if (!task)
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return SCSI_MLQUEUE_HOST_BUSY;
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/* Queue up, Direct Mode or Task Collector Mode. */
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if (sas_ha->lldd_max_execute_num < 2)
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res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
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else
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res = sas_queue_up(task);
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if (res)
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goto out_free_task;
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return 0;
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out_free_task:
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SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
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ASSIGN_SAS_TASK(cmd, NULL);
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sas_free_task(task);
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if (res == -SAS_QUEUE_FULL)
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cmd->result = DID_SOFT_ERROR << 16; /* retry */
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else
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cmd->result = DID_ERROR << 16;
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out_done:
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cmd->scsi_done(cmd);
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return 0;
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}
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static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
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{
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struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
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struct sas_task *task = TO_SAS_TASK(cmd);
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/* At this point, we only get called following an actual abort
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* of the task, so we should be guaranteed not to be racing with
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* any completions from the LLD. Task is freed after this.
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*/
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sas_end_task(cmd, task);
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/* now finish the command and move it on to the error
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* handler done list, this also takes it off the
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* error handler pending list.
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*/
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scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
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}
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static void sas_eh_defer_cmd(struct scsi_cmnd *cmd)
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{
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struct domain_device *dev = cmd_to_domain_dev(cmd);
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struct sas_ha_struct *ha = dev->port->ha;
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struct sas_task *task = TO_SAS_TASK(cmd);
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if (!dev_is_sata(dev)) {
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sas_eh_finish_cmd(cmd);
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return;
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}
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/* report the timeout to libata */
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sas_end_task(cmd, task);
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list_move_tail(&cmd->eh_entry, &ha->eh_ata_q);
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}
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static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
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{
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struct scsi_cmnd *cmd, *n;
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list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
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if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
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cmd->device->lun == my_cmd->device->lun)
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sas_eh_defer_cmd(cmd);
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}
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}
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static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
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struct domain_device *dev)
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{
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struct scsi_cmnd *cmd, *n;
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list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
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struct domain_device *x = cmd_to_domain_dev(cmd);
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if (x == dev)
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sas_eh_finish_cmd(cmd);
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}
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}
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static void sas_scsi_clear_queue_port(struct list_head *error_q,
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struct asd_sas_port *port)
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{
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struct scsi_cmnd *cmd, *n;
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list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
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struct domain_device *dev = cmd_to_domain_dev(cmd);
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struct asd_sas_port *x = dev->port;
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if (x == port)
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sas_eh_finish_cmd(cmd);
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}
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}
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enum task_disposition {
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TASK_IS_DONE,
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TASK_IS_ABORTED,
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TASK_IS_AT_LU,
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TASK_IS_NOT_AT_HA,
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TASK_IS_NOT_AT_LU,
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TASK_ABORT_FAILED,
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};
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static enum task_disposition sas_scsi_find_task(struct sas_task *task)
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{
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struct sas_ha_struct *ha = task->dev->port->ha;
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unsigned long flags;
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int i, res;
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struct sas_internal *si =
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to_sas_internal(task->dev->port->ha->core.shost->transportt);
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if (ha->lldd_max_execute_num > 1) {
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struct scsi_core *core = &ha->core;
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struct sas_task *t, *n;
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mutex_lock(&core->task_queue_flush);
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spin_lock_irqsave(&core->task_queue_lock, flags);
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list_for_each_entry_safe(t, n, &core->task_queue, list)
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if (task == t) {
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list_del_init(&t->list);
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break;
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}
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spin_unlock_irqrestore(&core->task_queue_lock, flags);
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mutex_unlock(&core->task_queue_flush);
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if (task == t)
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return TASK_IS_NOT_AT_HA;
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}
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for (i = 0; i < 5; i++) {
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SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
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res = si->dft->lldd_abort_task(task);
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spin_lock_irqsave(&task->task_state_lock, flags);
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if (task->task_state_flags & SAS_TASK_STATE_DONE) {
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spin_unlock_irqrestore(&task->task_state_lock, flags);
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SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
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task);
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return TASK_IS_DONE;
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}
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spin_unlock_irqrestore(&task->task_state_lock, flags);
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if (res == TMF_RESP_FUNC_COMPLETE) {
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SAS_DPRINTK("%s: task 0x%p is aborted\n",
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__func__, task);
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return TASK_IS_ABORTED;
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} else if (si->dft->lldd_query_task) {
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SAS_DPRINTK("%s: querying task 0x%p\n",
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__func__, task);
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res = si->dft->lldd_query_task(task);
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switch (res) {
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case TMF_RESP_FUNC_SUCC:
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SAS_DPRINTK("%s: task 0x%p at LU\n",
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__func__, task);
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return TASK_IS_AT_LU;
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case TMF_RESP_FUNC_COMPLETE:
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SAS_DPRINTK("%s: task 0x%p not at LU\n",
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__func__, task);
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return TASK_IS_NOT_AT_LU;
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case TMF_RESP_FUNC_FAILED:
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SAS_DPRINTK("%s: task 0x%p failed to abort\n",
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__func__, task);
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return TASK_ABORT_FAILED;
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}
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}
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}
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return res;
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}
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static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
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{
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int res = TMF_RESP_FUNC_FAILED;
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struct scsi_lun lun;
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struct sas_internal *i =
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to_sas_internal(dev->port->ha->core.shost->transportt);
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int_to_scsilun(cmd->device->lun, &lun);
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SAS_DPRINTK("eh: device %llx LUN %llx has the task\n",
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SAS_ADDR(dev->sas_addr),
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cmd->device->lun);
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if (i->dft->lldd_abort_task_set)
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res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
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if (res == TMF_RESP_FUNC_FAILED) {
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if (i->dft->lldd_clear_task_set)
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res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
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}
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if (res == TMF_RESP_FUNC_FAILED) {
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if (i->dft->lldd_lu_reset)
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res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
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}
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return res;
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}
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static int sas_recover_I_T(struct domain_device *dev)
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{
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int res = TMF_RESP_FUNC_FAILED;
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struct sas_internal *i =
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to_sas_internal(dev->port->ha->core.shost->transportt);
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SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
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SAS_ADDR(dev->sas_addr));
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if (i->dft->lldd_I_T_nexus_reset)
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res = i->dft->lldd_I_T_nexus_reset(dev);
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return res;
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}
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|
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/* take a reference on the last known good phy for this device */
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struct sas_phy *sas_get_local_phy(struct domain_device *dev)
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{
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struct sas_ha_struct *ha = dev->port->ha;
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struct sas_phy *phy;
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unsigned long flags;
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/* a published domain device always has a valid phy, it may be
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* stale, but it is never NULL
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*/
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BUG_ON(!dev->phy);
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spin_lock_irqsave(&ha->phy_port_lock, flags);
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phy = dev->phy;
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get_device(&phy->dev);
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spin_unlock_irqrestore(&ha->phy_port_lock, flags);
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return phy;
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}
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EXPORT_SYMBOL_GPL(sas_get_local_phy);
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|
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static void sas_wait_eh(struct domain_device *dev)
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{
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struct sas_ha_struct *ha = dev->port->ha;
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DEFINE_WAIT(wait);
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|
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if (dev_is_sata(dev)) {
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ata_port_wait_eh(dev->sata_dev.ap);
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return;
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}
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retry:
|
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spin_lock_irq(&ha->lock);
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|
|
while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
|
|
prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
|
|
spin_unlock_irq(&ha->lock);
|
|
schedule();
|
|
spin_lock_irq(&ha->lock);
|
|
}
|
|
finish_wait(&ha->eh_wait_q, &wait);
|
|
|
|
spin_unlock_irq(&ha->lock);
|
|
|
|
/* make sure SCSI EH is complete */
|
|
if (scsi_host_in_recovery(ha->core.shost)) {
|
|
msleep(10);
|
|
goto retry;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(sas_wait_eh);
|
|
|
|
static int sas_queue_reset(struct domain_device *dev, int reset_type,
|
|
u64 lun, int wait)
|
|
{
|
|
struct sas_ha_struct *ha = dev->port->ha;
|
|
int scheduled = 0, tries = 100;
|
|
|
|
/* ata: promote lun reset to bus reset */
|
|
if (dev_is_sata(dev)) {
|
|
sas_ata_schedule_reset(dev);
|
|
if (wait)
|
|
sas_ata_wait_eh(dev);
|
|
return SUCCESS;
|
|
}
|
|
|
|
while (!scheduled && tries--) {
|
|
spin_lock_irq(&ha->lock);
|
|
if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
|
|
!test_bit(reset_type, &dev->state)) {
|
|
scheduled = 1;
|
|
ha->eh_active++;
|
|
list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
|
|
set_bit(SAS_DEV_EH_PENDING, &dev->state);
|
|
set_bit(reset_type, &dev->state);
|
|
int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
|
|
scsi_schedule_eh(ha->core.shost);
|
|
}
|
|
spin_unlock_irq(&ha->lock);
|
|
|
|
if (wait)
|
|
sas_wait_eh(dev);
|
|
|
|
if (scheduled)
|
|
return SUCCESS;
|
|
}
|
|
|
|
SAS_DPRINTK("%s reset of %s failed\n",
|
|
reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
|
|
dev_name(&dev->rphy->dev));
|
|
|
|
return FAILED;
|
|
}
|
|
|
|
int sas_eh_abort_handler(struct scsi_cmnd *cmd)
|
|
{
|
|
int res;
|
|
struct sas_task *task = TO_SAS_TASK(cmd);
|
|
struct Scsi_Host *host = cmd->device->host;
|
|
struct sas_internal *i = to_sas_internal(host->transportt);
|
|
|
|
if (current != host->ehandler)
|
|
return FAILED;
|
|
|
|
if (!i->dft->lldd_abort_task)
|
|
return FAILED;
|
|
|
|
res = i->dft->lldd_abort_task(task);
|
|
if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
|
|
return SUCCESS;
|
|
|
|
return FAILED;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
|
|
|
|
/* Attempt to send a LUN reset message to a device */
|
|
int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
|
|
{
|
|
int res;
|
|
struct scsi_lun lun;
|
|
struct Scsi_Host *host = cmd->device->host;
|
|
struct domain_device *dev = cmd_to_domain_dev(cmd);
|
|
struct sas_internal *i = to_sas_internal(host->transportt);
|
|
|
|
if (current != host->ehandler)
|
|
return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
|
|
|
|
int_to_scsilun(cmd->device->lun, &lun);
|
|
|
|
if (!i->dft->lldd_lu_reset)
|
|
return FAILED;
|
|
|
|
res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
|
|
if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
|
|
return SUCCESS;
|
|
|
|
return FAILED;
|
|
}
|
|
|
|
int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
|
|
{
|
|
int res;
|
|
struct Scsi_Host *host = cmd->device->host;
|
|
struct domain_device *dev = cmd_to_domain_dev(cmd);
|
|
struct sas_internal *i = to_sas_internal(host->transportt);
|
|
|
|
if (current != host->ehandler)
|
|
return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
|
|
|
|
if (!i->dft->lldd_I_T_nexus_reset)
|
|
return FAILED;
|
|
|
|
res = i->dft->lldd_I_T_nexus_reset(dev);
|
|
if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
|
|
res == -ENODEV)
|
|
return SUCCESS;
|
|
|
|
return FAILED;
|
|
}
|
|
|
|
/* Try to reset a device */
|
|
static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
|
|
{
|
|
int res;
|
|
struct Scsi_Host *shost = cmd->device->host;
|
|
|
|
if (!shost->hostt->eh_device_reset_handler)
|
|
goto try_bus_reset;
|
|
|
|
res = shost->hostt->eh_device_reset_handler(cmd);
|
|
if (res == SUCCESS)
|
|
return res;
|
|
|
|
try_bus_reset:
|
|
if (shost->hostt->eh_bus_reset_handler)
|
|
return shost->hostt->eh_bus_reset_handler(cmd);
|
|
|
|
return FAILED;
|
|
}
|
|
|
|
static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
|
|
{
|
|
struct scsi_cmnd *cmd, *n;
|
|
enum task_disposition res = TASK_IS_DONE;
|
|
int tmf_resp, need_reset;
|
|
struct sas_internal *i = to_sas_internal(shost->transportt);
|
|
unsigned long flags;
|
|
struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
|
|
LIST_HEAD(done);
|
|
|
|
/* clean out any commands that won the completion vs eh race */
|
|
list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
|
|
struct domain_device *dev = cmd_to_domain_dev(cmd);
|
|
struct sas_task *task;
|
|
|
|
spin_lock_irqsave(&dev->done_lock, flags);
|
|
/* by this point the lldd has either observed
|
|
* SAS_HA_FROZEN and is leaving the task alone, or has
|
|
* won the race with eh and decided to complete it
|
|
*/
|
|
task = TO_SAS_TASK(cmd);
|
|
spin_unlock_irqrestore(&dev->done_lock, flags);
|
|
|
|
if (!task)
|
|
list_move_tail(&cmd->eh_entry, &done);
|
|
}
|
|
|
|
Again:
|
|
list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
|
|
struct sas_task *task = TO_SAS_TASK(cmd);
|
|
|
|
list_del_init(&cmd->eh_entry);
|
|
|
|
spin_lock_irqsave(&task->task_state_lock, flags);
|
|
need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
|
|
spin_unlock_irqrestore(&task->task_state_lock, flags);
|
|
|
|
if (need_reset) {
|
|
SAS_DPRINTK("%s: task 0x%p requests reset\n",
|
|
__func__, task);
|
|
goto reset;
|
|
}
|
|
|
|
SAS_DPRINTK("trying to find task 0x%p\n", task);
|
|
res = sas_scsi_find_task(task);
|
|
|
|
cmd->eh_eflags = 0;
|
|
|
|
switch (res) {
|
|
case TASK_IS_NOT_AT_HA:
|
|
SAS_DPRINTK("%s: task 0x%p is not at ha: %s\n",
|
|
__func__, task,
|
|
cmd->retries ? "retry" : "aborted");
|
|
if (cmd->retries)
|
|
cmd->retries--;
|
|
sas_eh_finish_cmd(cmd);
|
|
continue;
|
|
case TASK_IS_DONE:
|
|
SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
|
|
task);
|
|
sas_eh_defer_cmd(cmd);
|
|
continue;
|
|
case TASK_IS_ABORTED:
|
|
SAS_DPRINTK("%s: task 0x%p is aborted\n",
|
|
__func__, task);
|
|
sas_eh_defer_cmd(cmd);
|
|
continue;
|
|
case TASK_IS_AT_LU:
|
|
SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
|
|
reset:
|
|
tmf_resp = sas_recover_lu(task->dev, cmd);
|
|
if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
|
|
SAS_DPRINTK("dev %016llx LU %llx is "
|
|
"recovered\n",
|
|
SAS_ADDR(task->dev),
|
|
cmd->device->lun);
|
|
sas_eh_defer_cmd(cmd);
|
|
sas_scsi_clear_queue_lu(work_q, cmd);
|
|
goto Again;
|
|
}
|
|
/* fallthrough */
|
|
case TASK_IS_NOT_AT_LU:
|
|
case TASK_ABORT_FAILED:
|
|
SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
|
|
task);
|
|
tmf_resp = sas_recover_I_T(task->dev);
|
|
if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
|
|
tmf_resp == -ENODEV) {
|
|
struct domain_device *dev = task->dev;
|
|
SAS_DPRINTK("I_T %016llx recovered\n",
|
|
SAS_ADDR(task->dev->sas_addr));
|
|
sas_eh_finish_cmd(cmd);
|
|
sas_scsi_clear_queue_I_T(work_q, dev);
|
|
goto Again;
|
|
}
|
|
/* Hammer time :-) */
|
|
try_to_reset_cmd_device(cmd);
|
|
if (i->dft->lldd_clear_nexus_port) {
|
|
struct asd_sas_port *port = task->dev->port;
|
|
SAS_DPRINTK("clearing nexus for port:%d\n",
|
|
port->id);
|
|
res = i->dft->lldd_clear_nexus_port(port);
|
|
if (res == TMF_RESP_FUNC_COMPLETE) {
|
|
SAS_DPRINTK("clear nexus port:%d "
|
|
"succeeded\n", port->id);
|
|
sas_eh_finish_cmd(cmd);
|
|
sas_scsi_clear_queue_port(work_q,
|
|
port);
|
|
goto Again;
|
|
}
|
|
}
|
|
if (i->dft->lldd_clear_nexus_ha) {
|
|
SAS_DPRINTK("clear nexus ha\n");
|
|
res = i->dft->lldd_clear_nexus_ha(ha);
|
|
if (res == TMF_RESP_FUNC_COMPLETE) {
|
|
SAS_DPRINTK("clear nexus ha "
|
|
"succeeded\n");
|
|
sas_eh_finish_cmd(cmd);
|
|
goto clear_q;
|
|
}
|
|
}
|
|
/* If we are here -- this means that no amount
|
|
* of effort could recover from errors. Quite
|
|
* possibly the HA just disappeared.
|
|
*/
|
|
SAS_DPRINTK("error from device %llx, LUN %llx "
|
|
"couldn't be recovered in any way\n",
|
|
SAS_ADDR(task->dev->sas_addr),
|
|
cmd->device->lun);
|
|
|
|
sas_eh_finish_cmd(cmd);
|
|
goto clear_q;
|
|
}
|
|
}
|
|
out:
|
|
list_splice_tail(&done, work_q);
|
|
list_splice_tail_init(&ha->eh_ata_q, work_q);
|
|
return;
|
|
|
|
clear_q:
|
|
SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
|
|
list_for_each_entry_safe(cmd, n, work_q, eh_entry)
|
|
sas_eh_finish_cmd(cmd);
|
|
goto out;
|
|
}
|
|
|
|
static void sas_eh_handle_resets(struct Scsi_Host *shost)
|
|
{
|
|
struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
|
|
struct sas_internal *i = to_sas_internal(shost->transportt);
|
|
|
|
/* handle directed resets to sas devices */
|
|
spin_lock_irq(&ha->lock);
|
|
while (!list_empty(&ha->eh_dev_q)) {
|
|
struct domain_device *dev;
|
|
struct ssp_device *ssp;
|
|
|
|
ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
|
|
list_del_init(&ssp->eh_list_node);
|
|
dev = container_of(ssp, typeof(*dev), ssp_dev);
|
|
kref_get(&dev->kref);
|
|
WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
|
|
|
|
spin_unlock_irq(&ha->lock);
|
|
|
|
if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
|
|
i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
|
|
|
|
if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
|
|
i->dft->lldd_I_T_nexus_reset(dev);
|
|
|
|
sas_put_device(dev);
|
|
spin_lock_irq(&ha->lock);
|
|
clear_bit(SAS_DEV_EH_PENDING, &dev->state);
|
|
ha->eh_active--;
|
|
}
|
|
spin_unlock_irq(&ha->lock);
|
|
}
|
|
|
|
|
|
void sas_scsi_recover_host(struct Scsi_Host *shost)
|
|
{
|
|
struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
|
|
LIST_HEAD(eh_work_q);
|
|
int tries = 0;
|
|
bool retry;
|
|
|
|
retry:
|
|
tries++;
|
|
retry = true;
|
|
spin_lock_irq(shost->host_lock);
|
|
list_splice_init(&shost->eh_cmd_q, &eh_work_q);
|
|
spin_unlock_irq(shost->host_lock);
|
|
|
|
SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
|
|
__func__, atomic_read(&shost->host_busy), shost->host_failed);
|
|
/*
|
|
* Deal with commands that still have SAS tasks (i.e. they didn't
|
|
* complete via the normal sas_task completion mechanism),
|
|
* SAS_HA_FROZEN gives eh dominion over all sas_task completion.
|
|
*/
|
|
set_bit(SAS_HA_FROZEN, &ha->state);
|
|
sas_eh_handle_sas_errors(shost, &eh_work_q);
|
|
clear_bit(SAS_HA_FROZEN, &ha->state);
|
|
if (list_empty(&eh_work_q))
|
|
goto out;
|
|
|
|
/*
|
|
* Now deal with SCSI commands that completed ok but have a an error
|
|
* code (and hopefully sense data) attached. This is roughly what
|
|
* scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
|
|
* command we see here has no sas_task and is thus unknown to the HA.
|
|
*/
|
|
sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
|
|
if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
|
|
scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
|
|
|
|
out:
|
|
if (ha->lldd_max_execute_num > 1)
|
|
wake_up_process(ha->core.queue_thread);
|
|
|
|
sas_eh_handle_resets(shost);
|
|
|
|
/* now link into libata eh --- if we have any ata devices */
|
|
sas_ata_strategy_handler(shost);
|
|
|
|
scsi_eh_flush_done_q(&ha->eh_done_q);
|
|
|
|
/* check if any new eh work was scheduled during the last run */
|
|
spin_lock_irq(&ha->lock);
|
|
if (ha->eh_active == 0) {
|
|
shost->host_eh_scheduled = 0;
|
|
retry = false;
|
|
}
|
|
spin_unlock_irq(&ha->lock);
|
|
|
|
if (retry)
|
|
goto retry;
|
|
|
|
SAS_DPRINTK("--- Exit %s: busy: %d failed: %d tries: %d\n",
|
|
__func__, atomic_read(&shost->host_busy),
|
|
shost->host_failed, tries);
|
|
}
|
|
|
|
enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
|
|
{
|
|
scmd_dbg(cmd, "command %p timed out\n", cmd);
|
|
|
|
return BLK_EH_NOT_HANDLED;
|
|
}
|
|
|
|
int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
|
|
{
|
|
struct domain_device *dev = sdev_to_domain_dev(sdev);
|
|
|
|
if (dev_is_sata(dev))
|
|
return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
|
|
{
|
|
struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
|
|
struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
|
|
struct domain_device *found_dev = NULL;
|
|
int i;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ha->phy_port_lock, flags);
|
|
for (i = 0; i < ha->num_phys; i++) {
|
|
struct asd_sas_port *port = ha->sas_port[i];
|
|
struct domain_device *dev;
|
|
|
|
spin_lock(&port->dev_list_lock);
|
|
list_for_each_entry(dev, &port->dev_list, dev_list_node) {
|
|
if (rphy == dev->rphy) {
|
|
found_dev = dev;
|
|
spin_unlock(&port->dev_list_lock);
|
|
goto found;
|
|
}
|
|
}
|
|
spin_unlock(&port->dev_list_lock);
|
|
}
|
|
found:
|
|
spin_unlock_irqrestore(&ha->phy_port_lock, flags);
|
|
|
|
return found_dev;
|
|
}
|
|
|
|
int sas_target_alloc(struct scsi_target *starget)
|
|
{
|
|
struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
|
|
struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
|
|
|
|
if (!found_dev)
|
|
return -ENODEV;
|
|
|
|
kref_get(&found_dev->kref);
|
|
starget->hostdata = found_dev;
|
|
return 0;
|
|
}
|
|
|
|
#define SAS_DEF_QD 256
|
|
|
|
int sas_slave_configure(struct scsi_device *scsi_dev)
|
|
{
|
|
struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
|
|
struct sas_ha_struct *sas_ha;
|
|
|
|
BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
|
|
|
|
if (dev_is_sata(dev)) {
|
|
ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
|
|
return 0;
|
|
}
|
|
|
|
sas_ha = dev->port->ha;
|
|
|
|
sas_read_port_mode_page(scsi_dev);
|
|
|
|
if (scsi_dev->tagged_supported) {
|
|
scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
|
|
scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
|
|
} else {
|
|
SAS_DPRINTK("device %llx, LUN %llx doesn't support "
|
|
"TCQ\n", SAS_ADDR(dev->sas_addr),
|
|
scsi_dev->lun);
|
|
scsi_dev->tagged_supported = 0;
|
|
scsi_set_tag_type(scsi_dev, 0);
|
|
scsi_deactivate_tcq(scsi_dev, 1);
|
|
}
|
|
|
|
scsi_dev->allow_restart = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
|
|
{
|
|
struct domain_device *dev = sdev_to_domain_dev(sdev);
|
|
|
|
if (dev_is_sata(dev))
|
|
return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
|
|
reason);
|
|
|
|
switch (reason) {
|
|
case SCSI_QDEPTH_DEFAULT:
|
|
case SCSI_QDEPTH_RAMP_UP:
|
|
if (!sdev->tagged_supported)
|
|
depth = 1;
|
|
scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
|
|
break;
|
|
case SCSI_QDEPTH_QFULL:
|
|
scsi_track_queue_full(sdev, depth);
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return depth;
|
|
}
|
|
|
|
int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
|
|
{
|
|
struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
|
|
|
|
if (dev_is_sata(dev))
|
|
return -EINVAL;
|
|
|
|
if (!scsi_dev->tagged_supported)
|
|
return 0;
|
|
|
|
scsi_deactivate_tcq(scsi_dev, 1);
|
|
|
|
scsi_set_tag_type(scsi_dev, qt);
|
|
scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
|
|
|
|
return qt;
|
|
}
|
|
|
|
int sas_bios_param(struct scsi_device *scsi_dev,
|
|
struct block_device *bdev,
|
|
sector_t capacity, int *hsc)
|
|
{
|
|
hsc[0] = 255;
|
|
hsc[1] = 63;
|
|
sector_div(capacity, 255*63);
|
|
hsc[2] = capacity;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* ---------- Task Collector Thread implementation ---------- */
|
|
|
|
static void sas_queue(struct sas_ha_struct *sas_ha)
|
|
{
|
|
struct scsi_core *core = &sas_ha->core;
|
|
unsigned long flags;
|
|
LIST_HEAD(q);
|
|
int can_queue;
|
|
int res;
|
|
struct sas_internal *i = to_sas_internal(core->shost->transportt);
|
|
|
|
mutex_lock(&core->task_queue_flush);
|
|
spin_lock_irqsave(&core->task_queue_lock, flags);
|
|
while (!kthread_should_stop() &&
|
|
!list_empty(&core->task_queue) &&
|
|
!test_bit(SAS_HA_FROZEN, &sas_ha->state)) {
|
|
|
|
can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
|
|
if (can_queue >= 0) {
|
|
can_queue = core->task_queue_size;
|
|
list_splice_init(&core->task_queue, &q);
|
|
} else {
|
|
struct list_head *a, *n;
|
|
|
|
can_queue = sas_ha->lldd_queue_size;
|
|
list_for_each_safe(a, n, &core->task_queue) {
|
|
list_move_tail(a, &q);
|
|
if (--can_queue == 0)
|
|
break;
|
|
}
|
|
can_queue = sas_ha->lldd_queue_size;
|
|
}
|
|
core->task_queue_size -= can_queue;
|
|
spin_unlock_irqrestore(&core->task_queue_lock, flags);
|
|
{
|
|
struct sas_task *task = list_entry(q.next,
|
|
struct sas_task,
|
|
list);
|
|
list_del_init(&q);
|
|
res = i->dft->lldd_execute_task(task, can_queue,
|
|
GFP_KERNEL);
|
|
if (unlikely(res))
|
|
__list_add(&q, task->list.prev, &task->list);
|
|
}
|
|
spin_lock_irqsave(&core->task_queue_lock, flags);
|
|
if (res) {
|
|
list_splice_init(&q, &core->task_queue); /*at head*/
|
|
core->task_queue_size += can_queue;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&core->task_queue_lock, flags);
|
|
mutex_unlock(&core->task_queue_flush);
|
|
}
|
|
|
|
/**
|
|
* sas_queue_thread -- The Task Collector thread
|
|
* @_sas_ha: pointer to struct sas_ha
|
|
*/
|
|
static int sas_queue_thread(void *_sas_ha)
|
|
{
|
|
struct sas_ha_struct *sas_ha = _sas_ha;
|
|
|
|
while (1) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule();
|
|
sas_queue(sas_ha);
|
|
if (kthread_should_stop())
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sas_init_queue(struct sas_ha_struct *sas_ha)
|
|
{
|
|
struct scsi_core *core = &sas_ha->core;
|
|
|
|
spin_lock_init(&core->task_queue_lock);
|
|
mutex_init(&core->task_queue_flush);
|
|
core->task_queue_size = 0;
|
|
INIT_LIST_HEAD(&core->task_queue);
|
|
|
|
core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
|
|
"sas_queue_%d", core->shost->host_no);
|
|
if (IS_ERR(core->queue_thread))
|
|
return PTR_ERR(core->queue_thread);
|
|
return 0;
|
|
}
|
|
|
|
void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
|
|
{
|
|
unsigned long flags;
|
|
struct scsi_core *core = &sas_ha->core;
|
|
struct sas_task *task, *n;
|
|
|
|
kthread_stop(core->queue_thread);
|
|
|
|
if (!list_empty(&core->task_queue))
|
|
SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
|
|
SAS_ADDR(sas_ha->sas_addr));
|
|
|
|
spin_lock_irqsave(&core->task_queue_lock, flags);
|
|
list_for_each_entry_safe(task, n, &core->task_queue, list) {
|
|
struct scsi_cmnd *cmd = task->uldd_task;
|
|
|
|
list_del_init(&task->list);
|
|
|
|
ASSIGN_SAS_TASK(cmd, NULL);
|
|
sas_free_task(task);
|
|
cmd->result = DID_ABORT << 16;
|
|
cmd->scsi_done(cmd);
|
|
}
|
|
spin_unlock_irqrestore(&core->task_queue_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Tell an upper layer that it needs to initiate an abort for a given task.
|
|
* This should only ever be called by an LLDD.
|
|
*/
|
|
void sas_task_abort(struct sas_task *task)
|
|
{
|
|
struct scsi_cmnd *sc = task->uldd_task;
|
|
|
|
/* Escape for libsas internal commands */
|
|
if (!sc) {
|
|
struct sas_task_slow *slow = task->slow_task;
|
|
|
|
if (!slow)
|
|
return;
|
|
if (!del_timer(&slow->timer))
|
|
return;
|
|
slow->timer.function(slow->timer.data);
|
|
return;
|
|
}
|
|
|
|
if (dev_is_sata(task->dev)) {
|
|
sas_ata_task_abort(task);
|
|
} else {
|
|
struct request_queue *q = sc->device->request_queue;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(q->queue_lock, flags);
|
|
blk_abort_request(sc->request);
|
|
spin_unlock_irqrestore(q->queue_lock, flags);
|
|
}
|
|
}
|
|
|
|
void sas_target_destroy(struct scsi_target *starget)
|
|
{
|
|
struct domain_device *found_dev = starget->hostdata;
|
|
|
|
if (!found_dev)
|
|
return;
|
|
|
|
starget->hostdata = NULL;
|
|
sas_put_device(found_dev);
|
|
}
|
|
|
|
static void sas_parse_addr(u8 *sas_addr, const char *p)
|
|
{
|
|
int i;
|
|
for (i = 0; i < SAS_ADDR_SIZE; i++) {
|
|
u8 h, l;
|
|
if (!*p)
|
|
break;
|
|
h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
|
|
p++;
|
|
l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
|
|
p++;
|
|
sas_addr[i] = (h<<4) | l;
|
|
}
|
|
}
|
|
|
|
#define SAS_STRING_ADDR_SIZE 16
|
|
|
|
int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
|
|
{
|
|
int res;
|
|
const struct firmware *fw;
|
|
|
|
res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
|
|
if (res)
|
|
return res;
|
|
|
|
if (fw->size < SAS_STRING_ADDR_SIZE) {
|
|
res = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
sas_parse_addr(addr, fw->data);
|
|
|
|
out:
|
|
release_firmware(fw);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(sas_request_addr);
|
|
|
|
EXPORT_SYMBOL_GPL(sas_queuecommand);
|
|
EXPORT_SYMBOL_GPL(sas_target_alloc);
|
|
EXPORT_SYMBOL_GPL(sas_slave_configure);
|
|
EXPORT_SYMBOL_GPL(sas_change_queue_depth);
|
|
EXPORT_SYMBOL_GPL(sas_change_queue_type);
|
|
EXPORT_SYMBOL_GPL(sas_bios_param);
|
|
EXPORT_SYMBOL_GPL(sas_task_abort);
|
|
EXPORT_SYMBOL_GPL(sas_phy_reset);
|
|
EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
|
|
EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
|
|
EXPORT_SYMBOL_GPL(sas_target_destroy);
|
|
EXPORT_SYMBOL_GPL(sas_ioctl);
|