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970 lines
24 KiB
970 lines
24 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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*/ |
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|
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#include <linux/kthread.h> |
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#include <linux/firmware.h> |
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#include <linux/export.h> |
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#include <linux/ctype.h> |
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#include <linux/kernel.h> |
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|
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#include "sas_internal.h" |
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|
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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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|
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#include <linux/err.h> |
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#include <linux/blkdev.h> |
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#include <linux/freezer.h> |
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#include <linux/gfp.h> |
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#include <linux/scatterlist.h> |
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#include <linux/libata.h> |
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|
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/* record final status and free the task */ |
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static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task) |
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{ |
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struct task_status_struct *ts = &task->task_status; |
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enum scsi_host_status hs = DID_OK; |
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enum exec_status stat = SAS_SAM_STAT_GOOD; |
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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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pr_notice("LLDD:%s sent SAS_PROTO_RESP for an SSP 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 SAS_SAM_STAT_CHECK_CONDITION: |
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memcpy(sc->sense_buffer, ts->buf, |
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min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size)); |
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stat = SAS_SAM_STAT_CHECK_CONDITION; |
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break; |
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default: |
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stat = ts->stat; |
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break; |
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} |
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} |
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sc->result = (hs << 16) | stat; |
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ASSIGN_SAS_TASK(sc, NULL); |
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sas_free_task(task); |
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} |
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|
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static void sas_scsi_task_done(struct sas_task *task) |
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{ |
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struct scsi_cmnd *sc = task->uldd_task; |
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struct domain_device *dev = task->dev; |
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struct sas_ha_struct *ha = dev->port->ha; |
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unsigned long flags; |
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spin_lock_irqsave(&dev->done_lock, flags); |
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if (test_bit(SAS_HA_FROZEN, &ha->state)) |
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task = NULL; |
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else |
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ASSIGN_SAS_TASK(sc, NULL); |
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spin_unlock_irqrestore(&dev->done_lock, flags); |
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if (unlikely(!task)) { |
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/* task will be completed by the error handler */ |
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pr_debug("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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pr_debug("task_done called with non existing SCSI cmnd!\n"); |
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sas_free_task(task); |
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return; |
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} |
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sas_end_task(sc, task); |
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scsi_done(sc); |
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} |
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static struct sas_task *sas_create_task(struct scsi_cmnd *cmd, |
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struct domain_device *dev, |
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gfp_t gfp_flags) |
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{ |
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struct sas_task *task = sas_alloc_task(gfp_flags); |
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struct scsi_lun lun; |
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if (!task) |
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return NULL; |
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task->uldd_task = cmd; |
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ASSIGN_SAS_TASK(cmd, task); |
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task->dev = dev; |
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task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */ |
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task->ssp_task.retry_count = 1; |
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int_to_scsilun(cmd->device->lun, &lun); |
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memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8); |
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task->ssp_task.task_attr = TASK_ATTR_SIMPLE; |
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task->ssp_task.cmd = cmd; |
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task->scatter = scsi_sglist(cmd); |
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task->num_scatter = scsi_sg_count(cmd); |
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task->total_xfer_len = scsi_bufflen(cmd); |
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task->data_dir = cmd->sc_data_direction; |
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task->task_done = sas_scsi_task_done; |
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return task; |
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} |
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int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd) |
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{ |
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struct sas_internal *i = to_sas_internal(host->transportt); |
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struct domain_device *dev = cmd_to_domain_dev(cmd); |
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struct sas_task *task; |
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int res = 0; |
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/* If the device fell off, no sense in issuing commands */ |
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if (test_bit(SAS_DEV_GONE, &dev->state)) { |
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cmd->result = DID_BAD_TARGET << 16; |
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goto out_done; |
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} |
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if (dev_is_sata(dev)) { |
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spin_lock_irq(dev->sata_dev.ap->lock); |
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res = ata_sas_queuecmd(cmd, dev->sata_dev.ap); |
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spin_unlock_irq(dev->sata_dev.ap->lock); |
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return res; |
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} |
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task = sas_create_task(cmd, dev, GFP_ATOMIC); |
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if (!task) |
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return SCSI_MLQUEUE_HOST_BUSY; |
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res = i->dft->lldd_execute_task(task, GFP_ATOMIC); |
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if (res) |
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goto out_free_task; |
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return 0; |
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out_free_task: |
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pr_debug("lldd_execute_task returned: %d\n", res); |
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ASSIGN_SAS_TASK(cmd, NULL); |
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sas_free_task(task); |
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if (res == -SAS_QUEUE_FULL) |
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cmd->result = DID_SOFT_ERROR << 16; /* retry */ |
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else |
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cmd->result = DID_ERROR << 16; |
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out_done: |
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scsi_done(cmd); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(sas_queuecommand); |
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static void sas_eh_finish_cmd(struct scsi_cmnd *cmd) |
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{ |
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struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host); |
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struct domain_device *dev = cmd_to_domain_dev(cmd); |
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struct sas_task *task = TO_SAS_TASK(cmd); |
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/* At this point, we only get called following an actual abort |
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* of the task, so we should be guaranteed not to be racing with |
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* any completions from the LLD. Task is freed after this. |
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*/ |
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sas_end_task(cmd, task); |
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if (dev_is_sata(dev)) { |
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/* defer commands to libata so that libata EH can |
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* handle ata qcs correctly |
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*/ |
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list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q); |
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return; |
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} |
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/* now finish the command and move it on to the error |
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* handler done list, this also takes it off the |
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* error handler pending list. |
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*/ |
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scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q); |
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} |
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static void sas_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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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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for (i = 0; i < 5; i++) { |
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pr_notice("%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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pr_debug("%s: task 0x%p is done\n", __func__, 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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pr_notice("%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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pr_notice("%s: querying task 0x%p\n", __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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pr_notice("%s: task 0x%p at LU\n", __func__, |
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task); |
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return TASK_IS_AT_LU; |
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case TMF_RESP_FUNC_COMPLETE: |
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pr_notice("%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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pr_notice("%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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pr_notice("eh: device %016llx LUN 0x%llx has the task\n", |
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SAS_ADDR(dev->sas_addr), |
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cmd->device->lun); |
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if (i->dft->lldd_abort_task_set) |
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res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun); |
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if (res == TMF_RESP_FUNC_FAILED) { |
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if (i->dft->lldd_clear_task_set) |
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res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun); |
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} |
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if (res == TMF_RESP_FUNC_FAILED) { |
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if (i->dft->lldd_lu_reset) |
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res = i->dft->lldd_lu_reset(dev, lun.scsi_lun); |
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} |
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return res; |
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} |
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static int sas_recover_I_T(struct domain_device *dev) |
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{ |
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int res = TMF_RESP_FUNC_FAILED; |
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struct sas_internal *i = |
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to_sas_internal(dev->port->ha->core.shost->transportt); |
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pr_notice("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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/* take a reference on the last known good phy for this device */ |
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struct sas_phy *sas_get_local_phy(struct domain_device *dev) |
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{ |
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struct sas_ha_struct *ha = dev->port->ha; |
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struct sas_phy *phy; |
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unsigned long flags; |
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/* a published domain device always has a valid phy, it may be |
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* stale, but it is never NULL |
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*/ |
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BUG_ON(!dev->phy); |
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spin_lock_irqsave(&ha->phy_port_lock, flags); |
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phy = dev->phy; |
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get_device(&phy->dev); |
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spin_unlock_irqrestore(&ha->phy_port_lock, flags); |
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return phy; |
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} |
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EXPORT_SYMBOL_GPL(sas_get_local_phy); |
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static void sas_wait_eh(struct domain_device *dev) |
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{ |
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struct sas_ha_struct *ha = dev->port->ha; |
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DEFINE_WAIT(wait); |
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if (dev_is_sata(dev)) { |
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ata_port_wait_eh(dev->sata_dev.ap); |
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return; |
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} |
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retry: |
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spin_lock_irq(&ha->lock); |
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while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) { |
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prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE); |
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spin_unlock_irq(&ha->lock); |
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schedule(); |
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spin_lock_irq(&ha->lock); |
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} |
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finish_wait(&ha->eh_wait_q, &wait); |
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spin_unlock_irq(&ha->lock); |
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/* make sure SCSI EH is complete */ |
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if (scsi_host_in_recovery(ha->core.shost)) { |
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msleep(10); |
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goto retry; |
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} |
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} |
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static int sas_queue_reset(struct domain_device *dev, int reset_type, |
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u64 lun, int wait) |
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{ |
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struct sas_ha_struct *ha = dev->port->ha; |
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int scheduled = 0, tries = 100; |
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/* ata: promote lun reset to bus reset */ |
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if (dev_is_sata(dev)) { |
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sas_ata_schedule_reset(dev); |
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if (wait) |
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sas_ata_wait_eh(dev); |
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return SUCCESS; |
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} |
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while (!scheduled && tries--) { |
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spin_lock_irq(&ha->lock); |
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if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) && |
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!test_bit(reset_type, &dev->state)) { |
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scheduled = 1; |
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ha->eh_active++; |
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list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q); |
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set_bit(SAS_DEV_EH_PENDING, &dev->state); |
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set_bit(reset_type, &dev->state); |
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int_to_scsilun(lun, &dev->ssp_dev.reset_lun); |
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scsi_schedule_eh(ha->core.shost); |
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} |
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spin_unlock_irq(&ha->lock); |
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if (wait) |
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sas_wait_eh(dev); |
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if (scheduled) |
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return SUCCESS; |
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} |
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pr_warn("%s reset of %s failed\n", |
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reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus", |
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dev_name(&dev->rphy->dev)); |
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return FAILED; |
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} |
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int sas_eh_abort_handler(struct scsi_cmnd *cmd) |
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{ |
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int res = TMF_RESP_FUNC_FAILED; |
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struct sas_task *task = TO_SAS_TASK(cmd); |
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struct Scsi_Host *host = cmd->device->host; |
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struct domain_device *dev = cmd_to_domain_dev(cmd); |
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struct sas_internal *i = to_sas_internal(host->transportt); |
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unsigned long flags; |
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if (!i->dft->lldd_abort_task) |
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return FAILED; |
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spin_lock_irqsave(host->host_lock, flags); |
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/* We cannot do async aborts for SATA devices */ |
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if (dev_is_sata(dev) && !host->host_eh_scheduled) { |
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spin_unlock_irqrestore(host->host_lock, flags); |
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return FAILED; |
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} |
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spin_unlock_irqrestore(host->host_lock, flags); |
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if (task) |
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res = i->dft->lldd_abort_task(task); |
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else |
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pr_notice("no task to abort\n"); |
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if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE) |
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return SUCCESS; |
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|
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return FAILED; |
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} |
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EXPORT_SYMBOL_GPL(sas_eh_abort_handler); |
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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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int res; |
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struct scsi_lun lun; |
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struct Scsi_Host *host = cmd->device->host; |
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struct domain_device *dev = cmd_to_domain_dev(cmd); |
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struct sas_internal *i = to_sas_internal(host->transportt); |
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|
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if (current != host->ehandler) |
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return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0); |
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int_to_scsilun(cmd->device->lun, &lun); |
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|
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if (!i->dft->lldd_lu_reset) |
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return FAILED; |
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res = i->dft->lldd_lu_reset(dev, lun.scsi_lun); |
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if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE) |
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return SUCCESS; |
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return FAILED; |
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} |
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EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler); |
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int sas_eh_target_reset_handler(struct scsi_cmnd *cmd) |
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{ |
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int res; |
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struct Scsi_Host *host = cmd->device->host; |
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struct domain_device *dev = cmd_to_domain_dev(cmd); |
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struct sas_internal *i = to_sas_internal(host->transportt); |
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|
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if (current != host->ehandler) |
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return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0); |
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|
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if (!i->dft->lldd_I_T_nexus_reset) |
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return FAILED; |
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res = i->dft->lldd_I_T_nexus_reset(dev); |
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if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE || |
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res == -ENODEV) |
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return SUCCESS; |
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|
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return FAILED; |
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} |
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EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler); |
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|
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/* 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_target_reset; |
|
|
|
res = shost->hostt->eh_device_reset_handler(cmd); |
|
if (res == SUCCESS) |
|
return res; |
|
|
|
try_target_reset: |
|
if (shost->hostt->eh_target_reset_handler) |
|
return shost->hostt->eh_target_reset_handler(cmd); |
|
|
|
return FAILED; |
|
} |
|
|
|
static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q) |
|
{ |
|
struct scsi_cmnd *cmd, *n; |
|
enum task_disposition res = TASK_IS_DONE; |
|
int tmf_resp, need_reset; |
|
struct sas_internal *i = to_sas_internal(shost->transportt); |
|
unsigned long flags; |
|
struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); |
|
LIST_HEAD(done); |
|
|
|
/* clean out any commands that won the completion vs eh race */ |
|
list_for_each_entry_safe(cmd, n, work_q, eh_entry) { |
|
struct domain_device *dev = cmd_to_domain_dev(cmd); |
|
struct sas_task *task; |
|
|
|
spin_lock_irqsave(&dev->done_lock, flags); |
|
/* by this point the lldd has either observed |
|
* SAS_HA_FROZEN and is leaving the task alone, or has |
|
* won the race with eh and decided to complete it |
|
*/ |
|
task = TO_SAS_TASK(cmd); |
|
spin_unlock_irqrestore(&dev->done_lock, flags); |
|
|
|
if (!task) |
|
list_move_tail(&cmd->eh_entry, &done); |
|
} |
|
|
|
Again: |
|
list_for_each_entry_safe(cmd, n, work_q, eh_entry) { |
|
struct sas_task *task = TO_SAS_TASK(cmd); |
|
|
|
list_del_init(&cmd->eh_entry); |
|
|
|
spin_lock_irqsave(&task->task_state_lock, flags); |
|
need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET; |
|
spin_unlock_irqrestore(&task->task_state_lock, flags); |
|
|
|
if (need_reset) { |
|
pr_notice("%s: task 0x%p requests reset\n", |
|
__func__, task); |
|
goto reset; |
|
} |
|
|
|
pr_debug("trying to find task 0x%p\n", task); |
|
res = sas_scsi_find_task(task); |
|
|
|
switch (res) { |
|
case TASK_IS_DONE: |
|
pr_notice("%s: task 0x%p is done\n", __func__, |
|
task); |
|
sas_eh_finish_cmd(cmd); |
|
continue; |
|
case TASK_IS_ABORTED: |
|
pr_notice("%s: task 0x%p is aborted\n", |
|
__func__, task); |
|
sas_eh_finish_cmd(cmd); |
|
continue; |
|
case TASK_IS_AT_LU: |
|
pr_info("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) { |
|
pr_notice("dev %016llx LU 0x%llx 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: |
|
pr_notice("task 0x%p is not at LU: I_T recover\n", |
|
task); |
|
tmf_resp = sas_recover_I_T(task->dev); |
|
if (tmf_resp == TMF_RESP_FUNC_COMPLETE || |
|
tmf_resp == -ENODEV) { |
|
struct domain_device *dev = task->dev; |
|
pr_notice("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; |
|
pr_debug("clearing nexus for port:%d\n", |
|
port->id); |
|
res = i->dft->lldd_clear_nexus_port(port); |
|
if (res == TMF_RESP_FUNC_COMPLETE) { |
|
pr_notice("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) { |
|
pr_debug("clear nexus ha\n"); |
|
res = i->dft->lldd_clear_nexus_ha(ha); |
|
if (res == TMF_RESP_FUNC_COMPLETE) { |
|
pr_notice("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. |
|
*/ |
|
pr_err("error from device %016llx, LUN 0x%llx couldn't be recovered in any way\n", |
|
SAS_ADDR(task->dev->sas_addr), |
|
cmd->device->lun); |
|
|
|
sas_eh_finish_cmd(cmd); |
|
goto clear_q; |
|
} |
|
} |
|
out: |
|
list_splice_tail(&done, work_q); |
|
list_splice_tail_init(&ha->eh_ata_q, work_q); |
|
return; |
|
|
|
clear_q: |
|
pr_debug("--- Exit %s -- clear_q\n", __func__); |
|
list_for_each_entry_safe(cmd, n, work_q, eh_entry) |
|
sas_eh_finish_cmd(cmd); |
|
goto out; |
|
} |
|
|
|
static void sas_eh_handle_resets(struct Scsi_Host *shost) |
|
{ |
|
struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); |
|
struct sas_internal *i = to_sas_internal(shost->transportt); |
|
|
|
/* handle directed resets to sas devices */ |
|
spin_lock_irq(&ha->lock); |
|
while (!list_empty(&ha->eh_dev_q)) { |
|
struct domain_device *dev; |
|
struct ssp_device *ssp; |
|
|
|
ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node); |
|
list_del_init(&ssp->eh_list_node); |
|
dev = container_of(ssp, typeof(*dev), ssp_dev); |
|
kref_get(&dev->kref); |
|
WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n"); |
|
|
|
spin_unlock_irq(&ha->lock); |
|
|
|
if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state)) |
|
i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun); |
|
|
|
if (test_and_clear_bit(SAS_DEV_RESET, &dev->state)) |
|
i->dft->lldd_I_T_nexus_reset(dev); |
|
|
|
sas_put_device(dev); |
|
spin_lock_irq(&ha->lock); |
|
clear_bit(SAS_DEV_EH_PENDING, &dev->state); |
|
ha->eh_active--; |
|
} |
|
spin_unlock_irq(&ha->lock); |
|
} |
|
|
|
|
|
void sas_scsi_recover_host(struct Scsi_Host *shost) |
|
{ |
|
struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); |
|
LIST_HEAD(eh_work_q); |
|
int tries = 0; |
|
bool retry; |
|
|
|
retry: |
|
tries++; |
|
retry = true; |
|
spin_lock_irq(shost->host_lock); |
|
list_splice_init(&shost->eh_cmd_q, &eh_work_q); |
|
spin_unlock_irq(shost->host_lock); |
|
|
|
pr_notice("Enter %s busy: %d failed: %d\n", |
|
__func__, scsi_host_busy(shost), shost->host_failed); |
|
/* |
|
* Deal with commands that still have SAS tasks (i.e. they didn't |
|
* complete via the normal sas_task completion mechanism), |
|
* SAS_HA_FROZEN gives eh dominion over all sas_task completion. |
|
*/ |
|
set_bit(SAS_HA_FROZEN, &ha->state); |
|
sas_eh_handle_sas_errors(shost, &eh_work_q); |
|
clear_bit(SAS_HA_FROZEN, &ha->state); |
|
if (list_empty(&eh_work_q)) |
|
goto out; |
|
|
|
/* |
|
* Now deal with SCSI commands that completed ok but have a an error |
|
* code (and hopefully sense data) attached. This is roughly what |
|
* scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any |
|
* command we see here has no sas_task and is thus unknown to the HA. |
|
*/ |
|
sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q); |
|
if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q)) |
|
scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q); |
|
|
|
out: |
|
sas_eh_handle_resets(shost); |
|
|
|
/* now link into libata eh --- if we have any ata devices */ |
|
sas_ata_strategy_handler(shost); |
|
|
|
scsi_eh_flush_done_q(&ha->eh_done_q); |
|
|
|
/* check if any new eh work was scheduled during the last run */ |
|
spin_lock_irq(&ha->lock); |
|
if (ha->eh_active == 0) { |
|
shost->host_eh_scheduled = 0; |
|
retry = false; |
|
} |
|
spin_unlock_irq(&ha->lock); |
|
|
|
if (retry) |
|
goto retry; |
|
|
|
pr_notice("--- Exit %s: busy: %d failed: %d tries: %d\n", |
|
__func__, scsi_host_busy(shost), |
|
shost->host_failed, tries); |
|
} |
|
|
|
int sas_ioctl(struct scsi_device *sdev, unsigned int cmd, void __user *arg) |
|
{ |
|
struct domain_device *dev = sdev_to_domain_dev(sdev); |
|
|
|
if (dev_is_sata(dev)) |
|
return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg); |
|
|
|
return -EINVAL; |
|
} |
|
EXPORT_SYMBOL_GPL(sas_ioctl); |
|
|
|
struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy) |
|
{ |
|
struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent); |
|
struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); |
|
struct domain_device *found_dev = NULL; |
|
int i; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&ha->phy_port_lock, flags); |
|
for (i = 0; i < ha->num_phys; i++) { |
|
struct asd_sas_port *port = ha->sas_port[i]; |
|
struct domain_device *dev; |
|
|
|
spin_lock(&port->dev_list_lock); |
|
list_for_each_entry(dev, &port->dev_list, dev_list_node) { |
|
if (rphy == dev->rphy) { |
|
found_dev = dev; |
|
spin_unlock(&port->dev_list_lock); |
|
goto found; |
|
} |
|
} |
|
spin_unlock(&port->dev_list_lock); |
|
} |
|
found: |
|
spin_unlock_irqrestore(&ha->phy_port_lock, flags); |
|
|
|
return found_dev; |
|
} |
|
|
|
int sas_target_alloc(struct scsi_target *starget) |
|
{ |
|
struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent); |
|
struct domain_device *found_dev = sas_find_dev_by_rphy(rphy); |
|
|
|
if (!found_dev) |
|
return -ENODEV; |
|
|
|
kref_get(&found_dev->kref); |
|
starget->hostdata = found_dev; |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(sas_target_alloc); |
|
|
|
#define SAS_DEF_QD 256 |
|
|
|
int sas_slave_configure(struct scsi_device *scsi_dev) |
|
{ |
|
struct domain_device *dev = sdev_to_domain_dev(scsi_dev); |
|
|
|
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_read_port_mode_page(scsi_dev); |
|
|
|
if (scsi_dev->tagged_supported) { |
|
scsi_change_queue_depth(scsi_dev, SAS_DEF_QD); |
|
} else { |
|
pr_notice("device %016llx, LUN 0x%llx doesn't support TCQ\n", |
|
SAS_ADDR(dev->sas_addr), scsi_dev->lun); |
|
scsi_change_queue_depth(scsi_dev, 1); |
|
} |
|
|
|
scsi_dev->allow_restart = 1; |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(sas_slave_configure); |
|
|
|
int sas_change_queue_depth(struct scsi_device *sdev, int depth) |
|
{ |
|
struct domain_device *dev = sdev_to_domain_dev(sdev); |
|
|
|
if (dev_is_sata(dev)) |
|
return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth); |
|
|
|
if (!sdev->tagged_supported) |
|
depth = 1; |
|
return scsi_change_queue_depth(sdev, depth); |
|
} |
|
EXPORT_SYMBOL_GPL(sas_change_queue_depth); |
|
|
|
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; |
|
} |
|
EXPORT_SYMBOL_GPL(sas_bios_param); |
|
|
|
/* |
|
* Tell an upper layer that it needs to initiate an abort for a given task. |
|
* This should only ever be called by an LLDD. |
|
*/ |
|
void sas_task_abort(struct sas_task *task) |
|
{ |
|
struct scsi_cmnd *sc = task->uldd_task; |
|
|
|
/* Escape for libsas internal commands */ |
|
if (!sc) { |
|
struct sas_task_slow *slow = task->slow_task; |
|
|
|
if (!slow) |
|
return; |
|
if (!del_timer(&slow->timer)) |
|
return; |
|
slow->timer.function(&slow->timer); |
|
return; |
|
} |
|
|
|
if (dev_is_sata(task->dev)) |
|
sas_ata_task_abort(task); |
|
else |
|
blk_abort_request(scsi_cmd_to_rq(sc)); |
|
} |
|
EXPORT_SYMBOL_GPL(sas_task_abort); |
|
|
|
int sas_slave_alloc(struct scsi_device *sdev) |
|
{ |
|
if (dev_is_sata(sdev_to_domain_dev(sdev)) && sdev->lun) |
|
return -ENXIO; |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(sas_slave_alloc); |
|
|
|
void sas_target_destroy(struct scsi_target *starget) |
|
{ |
|
struct domain_device *found_dev = starget->hostdata; |
|
|
|
if (!found_dev) |
|
return; |
|
|
|
starget->hostdata = NULL; |
|
sas_put_device(found_dev); |
|
} |
|
EXPORT_SYMBOL_GPL(sas_target_destroy); |
|
|
|
#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; |
|
} |
|
|
|
res = hex2bin(addr, fw->data, strnlen(fw->data, SAS_ADDR_SIZE * 2) / 2); |
|
if (res) |
|
goto out; |
|
|
|
out: |
|
release_firmware(fw); |
|
return res; |
|
} |
|
EXPORT_SYMBOL_GPL(sas_request_addr); |
|
|
|
|