![Jens Axboe](/assets/img/avatar_default.png)
Right now SCSI and others do their own command timeout handling. Move those bits to the block layer. Instead of having a timer per command, we try to be a bit more clever and simply have one per-queue. This avoids the overhead of having to tear down and setup a timer for each command, so it will result in a lot less timer fiddling. Signed-off-by: Mike Anderson <andmike@linux.vnet.ibm.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
1124 lines
28 KiB
C
1124 lines
28 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/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/scatterlist.h>
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#include <linux/libata.h>
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/* ---------- SCSI Host glue ---------- */
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static void sas_scsi_task_done(struct sas_task *task)
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{
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struct task_status_struct *ts = &task->task_status;
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struct scsi_cmnd *sc = task->uldd_task;
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int hs = 0, stat = 0;
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if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
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/* Aborted tasks 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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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_CHECK_COND:
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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_CHECK_COND;
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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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ASSIGN_SAS_TASK(sc, NULL);
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sc->result = (hs << 16) | stat;
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list_del_init(&task->list);
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sas_free_task(task);
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sc->scsi_done(sc);
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}
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static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
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{
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enum task_attribute ta = TASK_ATTR_SIMPLE;
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if (cmd->request && blk_rq_tagged(cmd->request)) {
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if (cmd->device->ordered_tags &&
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(cmd->request->cmd_flags & REQ_HARDBARRIER))
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ta = TASK_ATTR_ORDERED;
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}
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return ta;
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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 = sas_scsi_get_task_attr(cmd);
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memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
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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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/**
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* sas_queuecommand -- Enqueue a command for processing
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* @parameters: See SCSI Core documentation
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*
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* Note: XXX: Remove the host unlock/lock pair when SCSI Core can
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* call us without holding an IRQ spinlock...
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*/
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int sas_queuecommand(struct scsi_cmnd *cmd,
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void (*scsi_done)(struct scsi_cmnd *))
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__releases(host->host_lock)
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__acquires(dev->sata_dev.ap->lock)
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__releases(dev->sata_dev.ap->lock)
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__acquires(host->host_lock)
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{
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int res = 0;
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struct domain_device *dev = cmd_to_domain_dev(cmd);
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struct Scsi_Host *host = cmd->device->host;
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struct sas_internal *i = to_sas_internal(host->transportt);
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spin_unlock_irq(host->host_lock);
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{
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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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if (dev_is_sata(dev)) {
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unsigned long flags;
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spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
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res = ata_sas_queuecmd(cmd, scsi_done,
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dev->sata_dev.ap);
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spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
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goto out;
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}
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res = -ENOMEM;
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task = sas_create_task(cmd, dev, GFP_ATOMIC);
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if (!task)
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goto out;
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cmd->scsi_done = scsi_done;
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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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/* Examine */
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if (res) {
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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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res = 0;
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scsi_done(cmd);
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}
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goto out;
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}
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}
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out:
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spin_lock_irq(host->host_lock);
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return res;
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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_task *task = TO_SAS_TASK(cmd);
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struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
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/* remove the aborted task flag to allow the task to be
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* completed now. At this point, we only get called following
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* an actual abort of the task, so we should be guaranteed not
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* to be racing with any completions from the LLD (hence we
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* don't need the task state lock to clear the flag) */
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task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
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/* Now call task_done. However, task will be free'd after
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* this */
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task->task_done(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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scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_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_finish_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_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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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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spin_unlock_irqrestore(&core->task_queue_lock,
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flags);
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SAS_DPRINTK("%s: task 0x%p aborted from "
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"task_queue\n",
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__func__, task);
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return TASK_IS_ABORTED;
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}
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}
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spin_unlock_irqrestore(&core->task_queue_lock, flags);
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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 %x 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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/* Find the sas_phy that's attached to this device */
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struct sas_phy *sas_find_local_phy(struct domain_device *dev)
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{
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struct domain_device *pdev = dev->parent;
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struct ex_phy *exphy = NULL;
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int i;
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/* Directly attached device */
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if (!pdev)
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return dev->port->phy;
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/* Otherwise look in the expander */
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for (i = 0; i < pdev->ex_dev.num_phys; i++)
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if (!memcmp(dev->sas_addr,
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pdev->ex_dev.ex_phy[i].attached_sas_addr,
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SAS_ADDR_SIZE)) {
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exphy = &pdev->ex_dev.ex_phy[i];
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break;
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}
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BUG_ON(!exphy);
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return exphy->phy;
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}
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EXPORT_SYMBOL_GPL(sas_find_local_phy);
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|
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/* Attempt to send a LUN reset message to a device */
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int sas_eh_device_reset_handler(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_internal *i =
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to_sas_internal(dev->port->ha->core.shost->transportt);
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struct scsi_lun lun;
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int res;
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int_to_scsilun(cmd->device->lun, &lun);
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|
|
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;
|
|
}
|
|
|
|
/* Attempt to send a phy (bus) reset */
|
|
int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
|
|
{
|
|
struct domain_device *dev = cmd_to_domain_dev(cmd);
|
|
struct sas_phy *phy = sas_find_local_phy(dev);
|
|
int res;
|
|
|
|
res = sas_phy_reset(phy, 1);
|
|
if (res)
|
|
SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
|
|
kobject_name(&phy->dev.kobj),
|
|
res);
|
|
if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
|
|
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 int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
|
|
struct list_head *work_q,
|
|
struct list_head *done_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);
|
|
|
|
Again:
|
|
list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
|
|
struct sas_task *task = TO_SAS_TASK(cmd);
|
|
|
|
if (!task)
|
|
continue;
|
|
|
|
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_DONE:
|
|
SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
|
|
task);
|
|
sas_eh_finish_cmd(cmd);
|
|
continue;
|
|
case TASK_IS_ABORTED:
|
|
SAS_DPRINTK("%s: task 0x%p is aborted\n",
|
|
__func__, task);
|
|
sas_eh_finish_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 %x is "
|
|
"recovered\n",
|
|
SAS_ADDR(task->dev),
|
|
cmd->device->lun);
|
|
sas_eh_finish_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) {
|
|
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 %x "
|
|
"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;
|
|
}
|
|
}
|
|
return list_empty(work_q);
|
|
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);
|
|
|
|
return list_empty(work_q);
|
|
}
|
|
|
|
void sas_scsi_recover_host(struct Scsi_Host *shost)
|
|
{
|
|
struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
|
|
unsigned long flags;
|
|
LIST_HEAD(eh_work_q);
|
|
|
|
spin_lock_irqsave(shost->host_lock, flags);
|
|
list_splice_init(&shost->eh_cmd_q, &eh_work_q);
|
|
spin_unlock_irqrestore(shost->host_lock, flags);
|
|
|
|
SAS_DPRINTK("Enter %s\n", __func__);
|
|
/*
|
|
* Deal with commands that still have SAS tasks (i.e. they didn't
|
|
* complete via the normal sas_task completion mechanism)
|
|
*/
|
|
if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_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.
|
|
*/
|
|
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:
|
|
scsi_eh_flush_done_q(&ha->eh_done_q);
|
|
SAS_DPRINTK("--- Exit %s\n", __func__);
|
|
return;
|
|
}
|
|
|
|
enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
|
|
{
|
|
struct sas_task *task = TO_SAS_TASK(cmd);
|
|
unsigned long flags;
|
|
|
|
if (!task) {
|
|
cmd->request->timeout /= 2;
|
|
SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
|
|
cmd, task, (cmd->request->timeout ?
|
|
"BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
|
|
if (!cmd->request->timeout)
|
|
return BLK_EH_NOT_HANDLED;
|
|
return BLK_EH_RESET_TIMER;
|
|
}
|
|
|
|
spin_lock_irqsave(&task->task_state_lock, flags);
|
|
BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
|
|
if (task->task_state_flags & SAS_TASK_STATE_DONE) {
|
|
spin_unlock_irqrestore(&task->task_state_lock, flags);
|
|
SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
|
|
"BLK_EH_HANDLED\n", cmd, task);
|
|
return BLK_EH_HANDLED;
|
|
}
|
|
if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
|
|
spin_unlock_irqrestore(&task->task_state_lock, flags);
|
|
SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
|
|
"BLK_EH_RESET_TIMER\n",
|
|
cmd, task);
|
|
return BLK_EH_RESET_TIMER;
|
|
}
|
|
task->task_state_flags |= SAS_TASK_STATE_ABORTED;
|
|
spin_unlock_irqrestore(&task->task_state_lock, flags);
|
|
|
|
SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
|
|
cmd, task);
|
|
|
|
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_scsi_ioctl(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;
|
|
}
|
|
|
|
static inline struct domain_device *sas_find_target(struct scsi_target *starget)
|
|
{
|
|
struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
|
|
|
|
return sas_find_dev_by_rphy(rphy);
|
|
}
|
|
|
|
int sas_target_alloc(struct scsi_target *starget)
|
|
{
|
|
struct domain_device *found_dev = sas_find_target(starget);
|
|
int res;
|
|
|
|
if (!found_dev)
|
|
return -ENODEV;
|
|
|
|
if (dev_is_sata(found_dev)) {
|
|
res = sas_ata_init_host_and_port(found_dev, starget);
|
|
if (res)
|
|
return res;
|
|
}
|
|
|
|
starget->hostdata = found_dev;
|
|
return 0;
|
|
}
|
|
|
|
#define SAS_DEF_QD 32
|
|
#define SAS_MAX_QD 64
|
|
|
|
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 %x 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;
|
|
}
|
|
|
|
void sas_slave_destroy(struct scsi_device *scsi_dev)
|
|
{
|
|
struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
|
|
|
|
if (dev_is_sata(dev))
|
|
ata_port_disable(dev->sata_dev.ap);
|
|
}
|
|
|
|
int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
|
|
{
|
|
int res = min(new_depth, SAS_MAX_QD);
|
|
|
|
if (scsi_dev->tagged_supported)
|
|
scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
|
|
res);
|
|
else {
|
|
struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
|
|
sas_printk("device %llx LUN %x queue depth changed to 1\n",
|
|
SAS_ADDR(dev->sas_addr),
|
|
scsi_dev->lun);
|
|
scsi_adjust_queue_depth(scsi_dev, 0, 1);
|
|
res = 1;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
|
|
{
|
|
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);
|
|
|
|
spin_lock_irqsave(&core->task_queue_lock, flags);
|
|
while (!kthread_should_stop() &&
|
|
!list_empty(&core->task_queue)) {
|
|
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Call the LLDD task abort routine directly. This function is intended for
|
|
* use by upper layers that need to tell the LLDD to abort a task.
|
|
*/
|
|
int __sas_task_abort(struct sas_task *task)
|
|
{
|
|
struct sas_internal *si =
|
|
to_sas_internal(task->dev->port->ha->core.shost->transportt);
|
|
unsigned long flags;
|
|
int res;
|
|
|
|
spin_lock_irqsave(&task->task_state_lock, flags);
|
|
if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
|
|
task->task_state_flags & SAS_TASK_STATE_DONE) {
|
|
spin_unlock_irqrestore(&task->task_state_lock, flags);
|
|
SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
|
|
task);
|
|
return 0;
|
|
}
|
|
task->task_state_flags |= SAS_TASK_STATE_ABORTED;
|
|
spin_unlock_irqrestore(&task->task_state_lock, flags);
|
|
|
|
if (!si->dft->lldd_abort_task)
|
|
return -ENODEV;
|
|
|
|
res = si->dft->lldd_abort_task(task);
|
|
|
|
spin_lock_irqsave(&task->task_state_lock, flags);
|
|
if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
|
|
(res == TMF_RESP_FUNC_COMPLETE))
|
|
{
|
|
spin_unlock_irqrestore(&task->task_state_lock, flags);
|
|
task->task_done(task);
|
|
return 0;
|
|
}
|
|
|
|
if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
|
|
task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
|
|
spin_unlock_irqrestore(&task->task_state_lock, flags);
|
|
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
if (!del_timer(&task->timer))
|
|
return;
|
|
task->timer.function(task->timer.data);
|
|
return;
|
|
}
|
|
|
|
if (dev_is_sata(task->dev)) {
|
|
sas_ata_task_abort(task);
|
|
return;
|
|
}
|
|
|
|
blk_abort_request(sc->request);
|
|
scsi_schedule_eh(sc->device->host);
|
|
}
|
|
|
|
int sas_slave_alloc(struct scsi_device *scsi_dev)
|
|
{
|
|
struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
|
|
|
|
if (dev_is_sata(dev))
|
|
return ata_sas_port_init(dev->sata_dev.ap);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void sas_target_destroy(struct scsi_target *starget)
|
|
{
|
|
struct domain_device *found_dev = sas_find_target(starget);
|
|
|
|
if (!found_dev)
|
|
return;
|
|
|
|
if (dev_is_sata(found_dev))
|
|
ata_sas_port_destroy(found_dev->sata_dev.ap);
|
|
|
|
return;
|
|
}
|
|
|
|
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_slave_destroy);
|
|
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_task_abort);
|
|
EXPORT_SYMBOL_GPL(sas_phy_reset);
|
|
EXPORT_SYMBOL_GPL(sas_phy_enable);
|
|
EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
|
|
EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
|
|
EXPORT_SYMBOL_GPL(sas_slave_alloc);
|
|
EXPORT_SYMBOL_GPL(sas_target_destroy);
|
|
EXPORT_SYMBOL_GPL(sas_ioctl);
|