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5cdac81a87
Introduce support for enhanced I/O error handling.
A device state is added to track 3 possible states of the device:
Normal - the device is operating normally and is fully operational
Limbo - the device is in a reset/recovery scenario and its operational
status is paused
Failed/terminating - the device has either failed to be reset/recovered
or is being terminated (removed); it is no longer
operational
All operations are allowed when the device is operating normally. When the
device transitions to limbo state, I/O must be paused. To help accomplish
this, a wait queue is introduced where existing and new threads can wait
until the device is no longer in limbo. When coming out of limbo, threads
need to check the state and error out gracefully when encountering the
failed state. When the device transitions to the failed/terminating state,
normal operations are no longer allowed. Only specially designated
operations related to graceful cleanup are permitted.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Michael Neuling <mikey@neuling.org>
Reviewed-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/*
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* CXL Flash Device Driver
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*
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* Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation
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* Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation
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*
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* Copyright (C) 2015 IBM Corporation
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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
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _CXLFLASH_MAIN_H
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#define _CXLFLASH_MAIN_H
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#include <linux/list.h>
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#include <linux/types.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_device.h>
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#define CXLFLASH_NAME "cxlflash"
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#define CXLFLASH_ADAPTER_NAME "IBM POWER CXL Flash Adapter"
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#define CXLFLASH_DRIVER_DATE "(August 13, 2015)"
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#define PCI_DEVICE_ID_IBM_CORSA 0x04F0
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#define CXLFLASH_SUBS_DEV_ID 0x04F0
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/* Since there is only one target, make it 0 */
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#define CXLFLASH_TARGET 0
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#define CXLFLASH_MAX_CDB_LEN 16
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/* Really only one target per bus since the Texan is directly attached */
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#define CXLFLASH_MAX_NUM_TARGETS_PER_BUS 1
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#define CXLFLASH_MAX_NUM_LUNS_PER_TARGET 65536
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#define CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT (120 * HZ)
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#define NUM_FC_PORTS CXLFLASH_NUM_FC_PORTS /* ports per AFU */
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/* FC defines */
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#define FC_MTIP_CMDCONFIG 0x010
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#define FC_MTIP_STATUS 0x018
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#define FC_PNAME 0x300
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#define FC_CONFIG 0x320
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#define FC_CONFIG2 0x328
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#define FC_STATUS 0x330
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#define FC_ERROR 0x380
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#define FC_ERRCAP 0x388
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#define FC_ERRMSK 0x390
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#define FC_CNT_CRCERR 0x538
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#define FC_CRC_THRESH 0x580
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#define FC_MTIP_CMDCONFIG_ONLINE 0x20ULL
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#define FC_MTIP_CMDCONFIG_OFFLINE 0x40ULL
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#define FC_MTIP_STATUS_MASK 0x30ULL
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#define FC_MTIP_STATUS_ONLINE 0x20ULL
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#define FC_MTIP_STATUS_OFFLINE 0x10ULL
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/* TIMEOUT and RETRY definitions */
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/* AFU command timeout values */
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#define MC_AFU_SYNC_TIMEOUT 5 /* 5 secs */
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/* AFU command room retry limit */
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#define MC_ROOM_RETRY_CNT 10
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/* FC CRC clear periodic timer */
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#define MC_CRC_THRESH 100 /* threshold in 5 mins */
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#define FC_PORT_STATUS_RETRY_CNT 100 /* 100 100ms retries = 10 seconds */
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#define FC_PORT_STATUS_RETRY_INTERVAL_US 100000 /* microseconds */
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/* VPD defines */
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#define CXLFLASH_VPD_LEN 256
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#define WWPN_LEN 16
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#define WWPN_BUF_LEN (WWPN_LEN + 1)
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enum undo_level {
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RELEASE_CONTEXT = 0,
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FREE_IRQ,
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UNMAP_ONE,
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UNMAP_TWO,
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UNMAP_THREE,
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UNDO_START
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};
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struct dev_dependent_vals {
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u64 max_sectors;
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};
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struct asyc_intr_info {
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u64 status;
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char *desc;
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u8 port;
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u8 action;
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#define CLR_FC_ERROR 0x01
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#define LINK_RESET 0x02
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};
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#ifndef CONFIG_CXL_EEH
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#define cxl_perst_reloads_same_image(_a, _b) do { } while (0)
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#endif
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#endif /* _CXLFLASH_MAIN_H */
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