8cff7eb82f
safe in some cases to reduce CCB priority after it was scheduled with high priority. This fixes reproducible deadlock when command sent through the pass interface while ATA XPT recovers from command timeout. Instead of that enforce priority at passioctl(). libcam provides no obvious interface to specify CCB priority and so much (all?) code specifies zero (highest) priority. This change limits pass CCBs priority to NORMAL run level, allowing XPT to complete bus and device recovery after reset before running any payload.
277 lines
9.2 KiB
C
277 lines
9.2 KiB
C
/*-
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* Data structures and definitions for the CAM system.
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*
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* Copyright (c) 1997 Justin T. Gibbs.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification, immediately at the beginning of the file.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _CAM_CAM_H
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#define _CAM_CAM_H 1
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#ifdef _KERNEL
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#include <opt_cam.h>
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#endif
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#include <sys/cdefs.h>
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typedef u_int path_id_t;
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typedef u_int target_id_t;
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typedef u_int lun_id_t;
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#define CAM_XPT_PATH_ID ((path_id_t)~0)
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#define CAM_BUS_WILDCARD ((path_id_t)~0)
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#define CAM_TARGET_WILDCARD ((target_id_t)~0)
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#define CAM_LUN_WILDCARD ((lun_id_t)~0)
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/*
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* Maximum length for a CAM CDB.
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*/
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#define CAM_MAX_CDBLEN 16
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/*
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* Definition of a CAM peripheral driver entry. Peripheral drivers instantiate
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* one of these for each device they wish to communicate with and pass it into
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* the xpt layer when they wish to schedule work on that device via the
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* xpt_schedule API.
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*/
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struct cam_periph;
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/*
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* Priority information for a CAM structure.
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*/
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typedef enum {
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CAM_RL_HOST,
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CAM_RL_BUS,
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CAM_RL_XPT,
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CAM_RL_DEV,
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CAM_RL_NORMAL,
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CAM_RL_VALUES
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} cam_rl;
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/*
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* The generation number is incremented everytime a new entry is entered into
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* the queue giving round robin per priority level scheduling.
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*/
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typedef struct {
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u_int32_t priority;
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#define CAM_PRIORITY_HOST ((CAM_RL_HOST << 8) + 0x80)
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#define CAM_PRIORITY_BUS ((CAM_RL_BUS << 8) + 0x80)
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#define CAM_PRIORITY_XPT ((CAM_RL_XPT << 8) + 0x80)
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#define CAM_PRIORITY_DEV ((CAM_RL_DEV << 8) + 0x80)
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#define CAM_PRIORITY_NORMAL ((CAM_RL_NORMAL << 8) + 0x80)
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#define CAM_PRIORITY_NONE (u_int32_t)-1
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#define CAM_PRIORITY_TO_RL(x) ((x) >> 8)
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#define CAM_RL_TO_PRIORITY(x) ((x) << 8)
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u_int32_t generation;
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int index;
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#define CAM_UNQUEUED_INDEX -1
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#define CAM_ACTIVE_INDEX -2
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#define CAM_DONEQ_INDEX -3
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} cam_pinfo;
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/*
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* Macro to compare two generation numbers. It is used like this:
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*
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* if (GENERATIONCMP(a, >=, b))
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* ...;
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*
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* GERERATIONCMP uses modular arithmetic to guard against wraps
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* wraps in the generation number.
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*/
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#define GENERATIONCMP(x, op, y) ((int32_t)((x) - (y)) op 0)
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/* CAM flags XXX Move to cam_periph.h ??? */
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typedef enum {
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CAM_FLAG_NONE = 0x00,
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CAM_EXPECT_INQ_CHANGE = 0x01,
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CAM_RETRY_SELTO = 0x02 /* Retry Selection Timeouts */
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} cam_flags;
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enum {
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SF_RETRY_UA = 0x01, /* Retry UNIT ATTENTION conditions. */
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SF_NO_PRINT = 0x02, /* Never print error status. */
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SF_QUIET_IR = 0x04, /* Be quiet about Illegal Request reponses */
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SF_PRINT_ALWAYS = 0x08, /* Always print error status. */
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SF_NO_RECOVERY = 0x10, /* Don't do active error recovery. */
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SF_NO_RETRY = 0x20 /* Don't do any retries. */
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};
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/* CAM Status field values */
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typedef enum {
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CAM_REQ_INPROG, /* CCB request is in progress */
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CAM_REQ_CMP, /* CCB request completed without error */
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CAM_REQ_ABORTED, /* CCB request aborted by the host */
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CAM_UA_ABORT, /* Unable to abort CCB request */
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CAM_REQ_CMP_ERR, /* CCB request completed with an error */
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CAM_BUSY, /* CAM subsystem is busy */
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CAM_REQ_INVALID, /* CCB request was invalid */
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CAM_PATH_INVALID, /* Supplied Path ID is invalid */
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CAM_DEV_NOT_THERE, /* SCSI Device Not Installed/there */
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CAM_UA_TERMIO, /* Unable to terminate I/O CCB request */
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CAM_SEL_TIMEOUT, /* Target Selection Timeout */
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CAM_CMD_TIMEOUT, /* Command timeout */
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CAM_SCSI_STATUS_ERROR, /* SCSI error, look at error code in CCB */
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CAM_MSG_REJECT_REC, /* Message Reject Received */
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CAM_SCSI_BUS_RESET, /* SCSI Bus Reset Sent/Received */
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CAM_UNCOR_PARITY, /* Uncorrectable parity error occurred */
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CAM_AUTOSENSE_FAIL = 0x10,/* Autosense: request sense cmd fail */
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CAM_NO_HBA, /* No HBA Detected error */
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CAM_DATA_RUN_ERR, /* Data Overrun error */
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CAM_UNEXP_BUSFREE, /* Unexpected Bus Free */
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CAM_SEQUENCE_FAIL, /* Target Bus Phase Sequence Failure */
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CAM_CCB_LEN_ERR, /* CCB length supplied is inadequate */
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CAM_PROVIDE_FAIL, /* Unable to provide requested capability */
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CAM_BDR_SENT, /* A SCSI BDR msg was sent to target */
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CAM_REQ_TERMIO, /* CCB request terminated by the host */
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CAM_UNREC_HBA_ERROR, /* Unrecoverable Host Bus Adapter Error */
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CAM_REQ_TOO_BIG, /* The request was too large for this host */
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CAM_REQUEUE_REQ, /*
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* This request should be requeued to preserve
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* transaction ordering. This typically occurs
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* when the SIM recognizes an error that should
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* freeze the queue and must place additional
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* requests for the target at the sim level
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* back into the XPT queue.
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*/
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CAM_ATA_STATUS_ERROR, /* ATA error, look at error code in CCB */
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CAM_SCSI_IT_NEXUS_LOST, /* Initiator/Target Nexus lost. */
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CAM_SMP_STATUS_ERROR, /* SMP error, look at error code in CCB */
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CAM_IDE = 0x33, /* Initiator Detected Error */
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CAM_RESRC_UNAVAIL, /* Resource Unavailable */
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CAM_UNACKED_EVENT, /* Unacknowledged Event by Host */
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CAM_MESSAGE_RECV, /* Message Received in Host Target Mode */
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CAM_INVALID_CDB, /* Invalid CDB received in Host Target Mode */
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CAM_LUN_INVALID, /* Lun supplied is invalid */
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CAM_TID_INVALID, /* Target ID supplied is invalid */
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CAM_FUNC_NOTAVAIL, /* The requested function is not available */
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CAM_NO_NEXUS, /* Nexus is not established */
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CAM_IID_INVALID, /* The initiator ID is invalid */
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CAM_CDB_RECVD, /* The SCSI CDB has been received */
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CAM_LUN_ALRDY_ENA, /* The LUN is already enabled for target mode */
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CAM_SCSI_BUSY, /* SCSI Bus Busy */
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CAM_DEV_QFRZN = 0x40, /* The DEV queue is frozen w/this err */
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/* Autosense data valid for target */
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CAM_AUTOSNS_VALID = 0x80,
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CAM_RELEASE_SIMQ = 0x100,/* SIM ready to take more commands */
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CAM_SIM_QUEUED = 0x200,/* SIM has this command in it's queue */
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CAM_STATUS_MASK = 0x3F, /* Mask bits for just the status # */
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/* Target Specific Adjunct Status */
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CAM_SENT_SENSE = 0x40000000 /* sent sense with status */
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} cam_status;
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typedef enum {
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CAM_ESF_NONE = 0x00,
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CAM_ESF_COMMAND = 0x01,
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CAM_ESF_CAM_STATUS = 0x02,
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CAM_ESF_PROTO_STATUS = 0x04,
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CAM_ESF_ALL = 0xff
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} cam_error_string_flags;
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typedef enum {
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CAM_EPF_NONE = 0x00,
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CAM_EPF_MINIMAL = 0x01,
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CAM_EPF_NORMAL = 0x02,
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CAM_EPF_ALL = 0x03,
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CAM_EPF_LEVEL_MASK = 0x0f
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/* All bits above bit 3 are protocol-specific */
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} cam_error_proto_flags;
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typedef enum {
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CAM_ESF_PRINT_NONE = 0x00,
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CAM_ESF_PRINT_STATUS = 0x10,
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CAM_ESF_PRINT_SENSE = 0x20
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} cam_error_scsi_flags;
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typedef enum {
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CAM_ESMF_PRINT_NONE = 0x00,
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CAM_ESMF_PRINT_STATUS = 0x10,
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CAM_ESMF_PRINT_FULL_CMD = 0x20,
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} cam_error_smp_flags;
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typedef enum {
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CAM_EAF_PRINT_NONE = 0x00,
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CAM_EAF_PRINT_STATUS = 0x10,
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CAM_EAF_PRINT_RESULT = 0x20
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} cam_error_ata_flags;
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struct cam_status_entry
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{
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cam_status status_code;
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const char *status_text;
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};
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extern const struct cam_status_entry cam_status_table[];
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extern const int num_cam_status_entries;
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union ccb;
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#ifdef SYSCTL_DECL /* from sysctl.h */
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SYSCTL_DECL(_kern_cam);
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#endif
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__BEGIN_DECLS
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typedef int (cam_quirkmatch_t)(caddr_t, caddr_t);
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caddr_t cam_quirkmatch(caddr_t target, caddr_t quirk_table, int num_entries,
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int entry_size, cam_quirkmatch_t *comp_func);
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void cam_strvis(u_int8_t *dst, const u_int8_t *src, int srclen, int dstlen);
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int cam_strmatch(const u_int8_t *str, const u_int8_t *pattern, int str_len);
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const struct cam_status_entry*
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cam_fetch_status_entry(cam_status status);
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#ifdef _KERNEL
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char * cam_error_string(union ccb *ccb, char *str, int str_len,
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cam_error_string_flags flags,
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cam_error_proto_flags proto_flags);
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void cam_error_print(union ccb *ccb, cam_error_string_flags flags,
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cam_error_proto_flags proto_flags);
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#else /* _KERNEL */
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struct cam_device;
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char * cam_error_string(struct cam_device *device, union ccb *ccb, char *str,
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int str_len, cam_error_string_flags flags,
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cam_error_proto_flags proto_flags);
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void cam_error_print(struct cam_device *device, union ccb *ccb,
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cam_error_string_flags flags,
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cam_error_proto_flags proto_flags, FILE *ofile);
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#endif /* _KERNEL */
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__END_DECLS
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#ifdef _KERNEL
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static __inline void cam_init_pinfo(cam_pinfo *pinfo);
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static __inline void cam_init_pinfo(cam_pinfo *pinfo)
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{
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pinfo->priority = CAM_PRIORITY_NONE;
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pinfo->index = CAM_UNQUEUED_INDEX;
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}
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#endif
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#endif /* _CAM_CAM_H */
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