![Al Viro](/assets/img/avatar_default.png)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
787 lines
20 KiB
C
787 lines
20 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 "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_transport.h>
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#include <scsi/scsi_transport_sas.h>
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#include "../scsi_sas_internal.h"
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#include <linux/err.h>
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#include <linux/blkdev.h>
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#include <linux/scatterlist.h>
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/* ---------- SCSI Host glue ---------- */
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#define TO_SAS_TASK(_scsi_cmd) ((void *)(_scsi_cmd)->host_scribble)
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#define ASSIGN_SAS_TASK(_sc, _t) do { (_sc)->host_scribble = (void *) _t; } while (0)
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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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unsigned ts_flags = task->task_state_flags;
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int hs = 0, stat = 0;
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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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sc->resid = ts->residual;
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if (sc->request_bufflen - sc->resid < 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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max(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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/* This is very ugly but this is how SCSI Core works. */
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if (ts_flags & SAS_TASK_STATE_ABORTED)
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scsi_finish_command(sc);
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else
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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->flags & REQ_HARDBARRIER))
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ta = TASK_ATTR_HOQ;
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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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*(u32 *)cmd->sense_buffer = 0;
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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 = cmd->request_buffer;
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task->num_scatter = cmd->use_sg;
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task->total_xfer_len = cmd->request_bufflen;
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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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static 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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up(&core->queue_thread_sema);
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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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{
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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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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_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 == my_cmd)
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list_del_init(&cmd->eh_entry);
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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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list_del_init(&cmd->eh_entry);
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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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list_del_init(&cmd->eh_entry);
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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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};
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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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__FUNCTION__, 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", __FUNCTION__, 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", __FUNCTION__,
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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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__FUNCTION__, 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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__FUNCTION__, task);
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res = si->dft->lldd_query_task(task);
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if (res == TMF_RESP_FUNC_SUCC) {
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SAS_DPRINTK("%s: task 0x%p at LU\n",
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__FUNCTION__, task);
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return TASK_IS_AT_LU;
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} else if (res == TMF_RESP_FUNC_COMPLETE) {
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SAS_DPRINTK("%s: task 0x%p not at LU\n",
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__FUNCTION__, task);
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return TASK_IS_NOT_AT_LU;
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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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void sas_scsi_recover_host(struct Scsi_Host *shost)
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{
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struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
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unsigned long flags;
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LIST_HEAD(error_q);
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struct scsi_cmnd *cmd, *n;
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enum task_disposition res = TASK_IS_DONE;
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int tmf_resp;
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struct sas_internal *i = to_sas_internal(shost->transportt);
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spin_lock_irqsave(shost->host_lock, flags);
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list_splice_init(&shost->eh_cmd_q, &error_q);
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spin_unlock_irqrestore(shost->host_lock, flags);
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SAS_DPRINTK("Enter %s\n", __FUNCTION__);
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|
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/* All tasks on this list were marked SAS_TASK_STATE_ABORTED
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* by sas_scsi_timed_out() callback.
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*/
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Again:
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SAS_DPRINTK("going over list...\n");
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list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
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struct sas_task *task = TO_SAS_TASK(cmd);
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|
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SAS_DPRINTK("trying to find task 0x%p\n", task);
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list_del_init(&cmd->eh_entry);
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res = sas_scsi_find_task(task);
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|
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cmd->eh_eflags = 0;
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shost->host_failed--;
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|
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switch (res) {
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case TASK_IS_DONE:
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SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
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task);
|
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task->task_done(task);
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continue;
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case TASK_IS_ABORTED:
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SAS_DPRINTK("%s: task 0x%p is aborted\n",
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__FUNCTION__, task);
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task->task_done(task);
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continue;
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case TASK_IS_AT_LU:
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SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
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tmf_resp = sas_recover_lu(task->dev, cmd);
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if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
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SAS_DPRINTK("dev %016llx LU %x is "
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"recovered\n",
|
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SAS_ADDR(task->dev),
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cmd->device->lun);
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task->task_done(task);
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sas_scsi_clear_queue_lu(&error_q, cmd);
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goto Again;
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}
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/* fallthrough */
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case TASK_IS_NOT_AT_LU:
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SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
|
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task);
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tmf_resp = sas_recover_I_T(task->dev);
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if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
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SAS_DPRINTK("I_T %016llx recovered\n",
|
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SAS_ADDR(task->dev->sas_addr));
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task->task_done(task);
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sas_scsi_clear_queue_I_T(&error_q, task->dev);
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goto Again;
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}
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/* Hammer time :-) */
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if (i->dft->lldd_clear_nexus_port) {
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struct asd_sas_port *port = task->dev->port;
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SAS_DPRINTK("clearing nexus for port:%d\n",
|
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port->id);
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res = i->dft->lldd_clear_nexus_port(port);
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if (res == TMF_RESP_FUNC_COMPLETE) {
|
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SAS_DPRINTK("clear nexus port:%d "
|
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"succeeded\n", port->id);
|
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task->task_done(task);
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sas_scsi_clear_queue_port(&error_q,
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port);
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goto Again;
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}
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}
|
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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");
|
|
task->task_done(task);
|
|
goto out;
|
|
}
|
|
}
|
|
/* 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);
|
|
|
|
task->task_done(task);
|
|
goto clear_q;
|
|
}
|
|
}
|
|
out:
|
|
SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
|
|
return;
|
|
clear_q:
|
|
SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
|
|
list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
|
|
struct sas_task *task = TO_SAS_TASK(cmd);
|
|
list_del_init(&cmd->eh_entry);
|
|
task->task_done(task);
|
|
}
|
|
}
|
|
|
|
enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
|
|
{
|
|
struct sas_task *task = TO_SAS_TASK(cmd);
|
|
unsigned long flags;
|
|
|
|
if (!task) {
|
|
SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
|
|
cmd, task);
|
|
return EH_HANDLED;
|
|
}
|
|
|
|
spin_lock_irqsave(&task->task_state_lock, flags);
|
|
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: EH_HANDLED\n",
|
|
cmd, task);
|
|
return EH_HANDLED;
|
|
}
|
|
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: EH_NOT_HANDLED\n",
|
|
cmd, task);
|
|
|
|
return EH_NOT_HANDLED;
|
|
}
|
|
|
|
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;
|
|
|
|
spin_lock(&ha->phy_port_lock);
|
|
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(&ha->phy_port_lock);
|
|
|
|
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);
|
|
|
|
if (!found_dev)
|
|
return -ENODEV;
|
|
|
|
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);
|
|
|
|
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);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void sas_slave_destroy(struct scsi_device *scsi_dev)
|
|
{
|
|
}
|
|
|
|
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 (!core->queue_thread_kill &&
|
|
!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);
|
|
}
|
|
|
|
static DECLARE_COMPLETION(queue_th_comp);
|
|
|
|
/**
|
|
* 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;
|
|
struct scsi_core *core = &sas_ha->core;
|
|
|
|
daemonize("sas_queue_%d", core->shost->host_no);
|
|
current->flags |= PF_NOFREEZE;
|
|
|
|
complete(&queue_th_comp);
|
|
|
|
while (1) {
|
|
down_interruptible(&core->queue_thread_sema);
|
|
sas_queue(sas_ha);
|
|
if (core->queue_thread_kill)
|
|
break;
|
|
}
|
|
|
|
complete(&queue_th_comp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sas_init_queue(struct sas_ha_struct *sas_ha)
|
|
{
|
|
int res;
|
|
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);
|
|
init_MUTEX_LOCKED(&core->queue_thread_sema);
|
|
|
|
res = kernel_thread(sas_queue_thread, sas_ha, 0);
|
|
if (res >= 0)
|
|
wait_for_completion(&queue_th_comp);
|
|
|
|
return res < 0 ? res : 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;
|
|
|
|
init_completion(&queue_th_comp);
|
|
core->queue_thread_kill = 1;
|
|
up(&core->queue_thread_sema);
|
|
wait_for_completion(&queue_th_comp);
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|