From 35e9111a1e5d820a0eb6bb8e3d8905d2161e13b2 Mon Sep 17 00:00:00 2001 From: Steffen Maier Date: Thu, 17 May 2018 19:15:03 +0200 Subject: scsi: zfcp: support SCSI_ADAPTER_RESET via scsi_host sysfs attribute host_reset Make use of feature introduced with v3.2 commit 294436914454 ("[SCSI] scsi: Added support for adapter and firmware reset"). The common code interface was introduced for commit 95d31262b3c1 ("[SCSI] qla4xxx: Added support for adapter and firmware reset"). $ echo adapter > /sys/class/scsi_host/host/host_reset Example trace record formatted with zfcpdbf from s390-tools: Timestamp : ... Area : REC Subarea : 00 Level : 1 Exception : - CPU ID : .. Caller : 0x... Record ID : 1 ZFCP_DBF_REC_TRIG Tag : scshr_y SCSI sysfs host_reset yes LUN : 0xffffffffffffffff none (invalid) WWPN : 0x0000000000000000 none (invalid) D_ID : 0x00000000 none (invalid) Adapter status : 0x4500050b Port status : 0x00000000 none (invalid) LUN status : 0x00000000 none (invalid) Ready count : 0x00000001 Running count : 0x00000000 ERP want : 0x04 ZFCP_ERP_ACTION_REOPEN_ADAPTER ERP need : 0x04 ZFCP_ERP_ACTION_REOPEN_ADAPTER This is the common code equivalent to the zfcp-specific &dev_attr_adapter_failed.attr in zfcp_sysfs_adapter_attrs.attrs[]: $ echo 0 > /sys/bus/ccw/drivers/zfcp//failed The unsupported case returns EOPNOTSUPP: $ echo firmware > /sys/class/scsi_host/host/host_reset -bash: echo: write error: Operation not supported Example trace record formatted with zfcpdbf from s390-tools: Timestamp : ... Area : SCSI Subarea : 00 Level : 1 Exception : - CPU ID : .. Caller : 0x... Record ID : 1 Tag : scshr_n SCSI sysfs host_reset no Request ID : 0x0000000000000000 none (invalid) SCSI ID : 0xffffffff none (invalid) SCSI LUN : 0xffffffff none (invalid) SCSI LUN high : 0xffffffff none (invalid) SCSI result : 0xffffffa1 -EOPNOTSUPP==-95 SCSI retries : 0xff none (invalid) SCSI allowed : 0xff none (invalid) SCSI scribble : 0xffffffffffffffff none (invalid) SCSI opcode : ffffffff ffffffff ffffffff ffffffff none (invalid) FCP rsp inf cod: 0xff none (invalid) FCP rsp IU : 00000000 00000000 00000000 00000000 none (invalid) 00000000 00000000 For any other invalid value, common code returns EINVAL without invoking our callback: $ echo foo > /sys/class/scsi_host/host/host_reset -bash: echo: write error: Invalid argument Signed-off-by: Steffen Maier Reviewed-by: Benjamin Block Signed-off-by: Martin K. Petersen --- drivers/s390/scsi/zfcp_erp.c | 11 +++++++++++ drivers/s390/scsi/zfcp_ext.h | 1 + drivers/s390/scsi/zfcp_scsi.c | 26 ++++++++++++++++++++++++++ drivers/s390/scsi/zfcp_sysfs.c | 5 +---- 4 files changed, 39 insertions(+), 4 deletions(-) (limited to 'drivers/s390') diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c index 2968d2f57788..e7e6b63905e2 100644 --- a/drivers/s390/scsi/zfcp_erp.c +++ b/drivers/s390/scsi/zfcp_erp.c @@ -1691,3 +1691,14 @@ void zfcp_erp_clear_lun_status(struct scsi_device *sdev, u32 mask) atomic_set(&zfcp_sdev->erp_counter, 0); } +/** + * zfcp_erp_adapter_reset_sync() - Really reopen adapter and wait. + * @adapter: Pointer to zfcp_adapter to reopen. + * @id: Trace tag string of length %ZFCP_DBF_TAG_LEN. + */ +void zfcp_erp_adapter_reset_sync(struct zfcp_adapter *adapter, char *id) +{ + zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING); + zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, id); + zfcp_erp_wait(adapter); +} diff --git a/drivers/s390/scsi/zfcp_ext.h b/drivers/s390/scsi/zfcp_ext.h index ad7c28ffd49f..f3b55cce748a 100644 --- a/drivers/s390/scsi/zfcp_ext.h +++ b/drivers/s390/scsi/zfcp_ext.h @@ -76,6 +76,7 @@ extern void zfcp_erp_thread_kill(struct zfcp_adapter *); extern void zfcp_erp_wait(struct zfcp_adapter *); extern void zfcp_erp_notify(struct zfcp_erp_action *, unsigned long); extern void zfcp_erp_timeout_handler(struct timer_list *t); +extern void zfcp_erp_adapter_reset_sync(struct zfcp_adapter *adapter, char *id); /* zfcp_fc.c */ extern struct kmem_cache *zfcp_fc_req_cache; diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c index f69ef78ea930..9a01f583e562 100644 --- a/drivers/s390/scsi/zfcp_scsi.c +++ b/drivers/s390/scsi/zfcp_scsi.c @@ -372,6 +372,31 @@ static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) return ret; } +/** + * zfcp_scsi_sysfs_host_reset() - Support scsi_host sysfs attribute host_reset. + * @shost: Pointer to Scsi_Host to perform action on. + * @reset_type: We support %SCSI_ADAPTER_RESET but not %SCSI_FIRMWARE_RESET. + * + * Return: 0 on %SCSI_ADAPTER_RESET, -%EOPNOTSUPP otherwise. + * + * This is similar to zfcp_sysfs_adapter_failed_store(). + */ +static int zfcp_scsi_sysfs_host_reset(struct Scsi_Host *shost, int reset_type) +{ + struct zfcp_adapter *adapter = + (struct zfcp_adapter *)shost->hostdata[0]; + int ret = 0; + + if (reset_type != SCSI_ADAPTER_RESET) { + ret = -EOPNOTSUPP; + zfcp_dbf_scsi_eh("scshr_n", adapter, ~0, ret); + return ret; + } + + zfcp_erp_adapter_reset_sync(adapter, "scshr_y"); + return ret; +} + struct scsi_transport_template *zfcp_scsi_transport_template; static struct scsi_host_template zfcp_scsi_host_template = { @@ -387,6 +412,7 @@ static struct scsi_host_template zfcp_scsi_host_template = { .slave_configure = zfcp_scsi_slave_configure, .slave_destroy = zfcp_scsi_slave_destroy, .change_queue_depth = scsi_change_queue_depth, + .host_reset = zfcp_scsi_sysfs_host_reset, .proc_name = "zfcp", .can_queue = 4096, .this_id = -1, diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c index 3ac823f2540f..b277be6f7611 100644 --- a/drivers/s390/scsi/zfcp_sysfs.c +++ b/drivers/s390/scsi/zfcp_sysfs.c @@ -200,10 +200,7 @@ static ssize_t zfcp_sysfs_adapter_failed_store(struct device *dev, goto out; } - zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING); - zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED, - "syafai2"); - zfcp_erp_wait(adapter); + zfcp_erp_adapter_reset_sync(adapter, "syafai2"); out: zfcp_ccw_adapter_put(adapter); return retval ? retval : (ssize_t) count; -- cgit v1.2.3-59-g8ed1b