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122 lines
3.9 KiB
122 lines
3.9 KiB
/* |
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* Transport specific attributes. |
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* |
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* Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (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, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU 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 USA |
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*/ |
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#ifndef SCSI_TRANSPORT_H |
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#define SCSI_TRANSPORT_H |
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#include <linux/transport_class.h> |
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#include <linux/blkdev.h> |
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#include <linux/bug.h> |
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#include <scsi/scsi_host.h> |
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#include <scsi/scsi_device.h> |
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struct scsi_transport_template { |
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/* the attribute containers */ |
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struct transport_container host_attrs; |
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struct transport_container target_attrs; |
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struct transport_container device_attrs; |
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/* |
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* If set, called from sysfs and legacy procfs rescanning code. |
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*/ |
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int (*user_scan)(struct Scsi_Host *, uint, uint, u64); |
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/* The size of the specific transport attribute structure (a |
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* space of this size will be left at the end of the |
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* scsi_* structure */ |
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int device_size; |
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int device_private_offset; |
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int target_size; |
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int target_private_offset; |
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int host_size; |
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/* no private offset for the host; there's an alternative mechanism */ |
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/* |
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* True if the transport wants to use a host-based work-queue |
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*/ |
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unsigned int create_work_queue : 1; |
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/* |
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* Allows a transport to override the default error handler. |
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*/ |
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void (* eh_strategy_handler)(struct Scsi_Host *); |
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/* |
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* This is an optional routine that allows the transport to become |
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* involved when a scsi io timer fires. The return value tells the |
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* timer routine how to finish the io timeout handling: |
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* EH_HANDLED: I fixed the error, please complete the command |
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* EH_RESET_TIMER: I need more time, reset the timer and |
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* begin counting again |
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* EH_NOT_HANDLED Begin normal error recovery |
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*/ |
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enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *); |
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/* |
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* Used as callback for the completion of i_t_nexus request |
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* for target drivers. |
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*/ |
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int (* it_nexus_response)(struct Scsi_Host *, u64, int); |
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/* |
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* Used as callback for the completion of task management |
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* request for target drivers. |
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*/ |
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int (* tsk_mgmt_response)(struct Scsi_Host *, u64, u64, int); |
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}; |
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#define transport_class_to_shost(tc) \ |
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dev_to_shost((tc)->parent) |
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/* Private area maintenance. The driver requested allocations come |
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* directly after the transport class allocations (if any). The idea |
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* is that you *must* call these only once. The code assumes that the |
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* initial values are the ones the transport specific code requires */ |
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static inline void |
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scsi_transport_reserve_target(struct scsi_transport_template * t, int space) |
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{ |
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BUG_ON(t->target_private_offset != 0); |
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t->target_private_offset = ALIGN(t->target_size, sizeof(void *)); |
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t->target_size = t->target_private_offset + space; |
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} |
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static inline void |
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scsi_transport_reserve_device(struct scsi_transport_template * t, int space) |
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{ |
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BUG_ON(t->device_private_offset != 0); |
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t->device_private_offset = ALIGN(t->device_size, sizeof(void *)); |
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t->device_size = t->device_private_offset + space; |
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} |
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static inline void * |
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scsi_transport_target_data(struct scsi_target *starget) |
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{ |
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struct Scsi_Host *shost = dev_to_shost(&starget->dev); |
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return (u8 *)starget->starget_data |
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+ shost->transportt->target_private_offset; |
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} |
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static inline void * |
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scsi_transport_device_data(struct scsi_device *sdev) |
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{ |
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struct Scsi_Host *shost = sdev->host; |
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return (u8 *)sdev->sdev_data |
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+ shost->transportt->device_private_offset; |
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} |
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#endif /* SCSI_TRANSPORT_H */
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