mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-25 13:14:07 +08:00
d99b601b63
Upstream commit f3450c7b91
"[SCSI] zfcp: Replace local reference counting with common kref"
accidentally dropped a reference count check before tearing down
zfcp_ports that are potentially in use by zfcp_units.
Even remote ports in use can be removed causing
unreachable garbage objects zfcp_ports with zfcp_units.
Thus units won't come back even after a manual port_rescan.
The kref of zfcp_port->dev.kobj is already used by the driver core.
We cannot re-use it to track the number of zfcp_units.
Re-introduce our own counter for units per port
and check on port_remove.
Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: <stable@vger.kernel.org> #2.6.33+
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
327 lines
10 KiB
C
327 lines
10 KiB
C
/*
|
|
* zfcp device driver
|
|
*
|
|
* Global definitions for the zfcp device driver.
|
|
*
|
|
* Copyright IBM Corp. 2002, 2010
|
|
*/
|
|
|
|
#ifndef ZFCP_DEF_H
|
|
#define ZFCP_DEF_H
|
|
|
|
/*************************** INCLUDES *****************************************/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/major.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mempool.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/ioctl.h>
|
|
#include <scsi/fc/fc_fs.h>
|
|
#include <scsi/fc/fc_gs.h>
|
|
#include <scsi/scsi.h>
|
|
#include <scsi/scsi_tcq.h>
|
|
#include <scsi/scsi_cmnd.h>
|
|
#include <scsi/scsi_device.h>
|
|
#include <scsi/scsi_host.h>
|
|
#include <scsi/scsi_transport.h>
|
|
#include <scsi/scsi_transport_fc.h>
|
|
#include <scsi/scsi_bsg_fc.h>
|
|
#include <asm/ccwdev.h>
|
|
#include <asm/debug.h>
|
|
#include <asm/ebcdic.h>
|
|
#include <asm/sysinfo.h>
|
|
#include "zfcp_fsf.h"
|
|
#include "zfcp_fc.h"
|
|
#include "zfcp_qdio.h"
|
|
|
|
struct zfcp_reqlist;
|
|
|
|
/********************* SCSI SPECIFIC DEFINES *********************************/
|
|
#define ZFCP_SCSI_ER_TIMEOUT (10*HZ)
|
|
|
|
/********************* FSF SPECIFIC DEFINES *********************************/
|
|
|
|
/* ATTENTION: value must not be used by hardware */
|
|
#define FSF_QTCB_UNSOLICITED_STATUS 0x6305
|
|
|
|
/* timeout value for "default timer" for fsf requests */
|
|
#define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
|
|
|
|
/*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
|
|
|
|
/*
|
|
* Note, the leftmost status byte is common among adapter, port
|
|
* and unit
|
|
*/
|
|
#define ZFCP_COMMON_FLAGS 0xfff00000
|
|
|
|
/* common status bits */
|
|
#define ZFCP_STATUS_COMMON_RUNNING 0x40000000
|
|
#define ZFCP_STATUS_COMMON_ERP_FAILED 0x20000000
|
|
#define ZFCP_STATUS_COMMON_UNBLOCKED 0x10000000
|
|
#define ZFCP_STATUS_COMMON_OPEN 0x04000000
|
|
#define ZFCP_STATUS_COMMON_ERP_INUSE 0x01000000
|
|
#define ZFCP_STATUS_COMMON_ACCESS_DENIED 0x00800000
|
|
#define ZFCP_STATUS_COMMON_ACCESS_BOXED 0x00400000
|
|
#define ZFCP_STATUS_COMMON_NOESC 0x00200000
|
|
|
|
/* adapter status */
|
|
#define ZFCP_STATUS_ADAPTER_MB_ACT 0x00000001
|
|
#define ZFCP_STATUS_ADAPTER_QDIOUP 0x00000002
|
|
#define ZFCP_STATUS_ADAPTER_SIOSL_ISSUED 0x00000004
|
|
#define ZFCP_STATUS_ADAPTER_XCONFIG_OK 0x00000008
|
|
#define ZFCP_STATUS_ADAPTER_HOST_CON_INIT 0x00000010
|
|
#define ZFCP_STATUS_ADAPTER_SUSPENDED 0x00000040
|
|
#define ZFCP_STATUS_ADAPTER_ERP_PENDING 0x00000100
|
|
#define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED 0x00000200
|
|
#define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED 0x00000400
|
|
|
|
/* remote port status */
|
|
#define ZFCP_STATUS_PORT_PHYS_OPEN 0x00000001
|
|
#define ZFCP_STATUS_PORT_LINK_TEST 0x00000002
|
|
|
|
/* logical unit status */
|
|
#define ZFCP_STATUS_LUN_SHARED 0x00000004
|
|
#define ZFCP_STATUS_LUN_READONLY 0x00000008
|
|
|
|
/* FSF request status (this does not have a common part) */
|
|
#define ZFCP_STATUS_FSFREQ_ERROR 0x00000008
|
|
#define ZFCP_STATUS_FSFREQ_CLEANUP 0x00000010
|
|
#define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED 0x00000040
|
|
#define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED 0x00000080
|
|
#define ZFCP_STATUS_FSFREQ_TMFUNCFAILED 0x00000200
|
|
#define ZFCP_STATUS_FSFREQ_DISMISSED 0x00001000
|
|
|
|
/************************* STRUCTURE DEFINITIONS *****************************/
|
|
|
|
struct zfcp_fsf_req;
|
|
|
|
/* holds various memory pools of an adapter */
|
|
struct zfcp_adapter_mempool {
|
|
mempool_t *erp_req;
|
|
mempool_t *gid_pn_req;
|
|
mempool_t *scsi_req;
|
|
mempool_t *scsi_abort;
|
|
mempool_t *status_read_req;
|
|
mempool_t *sr_data;
|
|
mempool_t *gid_pn;
|
|
mempool_t *qtcb_pool;
|
|
};
|
|
|
|
struct zfcp_erp_action {
|
|
struct list_head list;
|
|
int action; /* requested action code */
|
|
struct zfcp_adapter *adapter; /* device which should be recovered */
|
|
struct zfcp_port *port;
|
|
struct scsi_device *sdev;
|
|
u32 status; /* recovery status */
|
|
u32 step; /* active step of this erp action */
|
|
unsigned long fsf_req_id;
|
|
struct timer_list timer;
|
|
};
|
|
|
|
struct fsf_latency_record {
|
|
u32 min;
|
|
u32 max;
|
|
u64 sum;
|
|
};
|
|
|
|
struct latency_cont {
|
|
struct fsf_latency_record channel;
|
|
struct fsf_latency_record fabric;
|
|
u64 counter;
|
|
};
|
|
|
|
struct zfcp_latencies {
|
|
struct latency_cont read;
|
|
struct latency_cont write;
|
|
struct latency_cont cmd;
|
|
spinlock_t lock;
|
|
};
|
|
|
|
struct zfcp_adapter {
|
|
struct kref ref;
|
|
u64 peer_wwnn; /* P2P peer WWNN */
|
|
u64 peer_wwpn; /* P2P peer WWPN */
|
|
u32 peer_d_id; /* P2P peer D_ID */
|
|
struct ccw_device *ccw_device; /* S/390 ccw device */
|
|
struct zfcp_qdio *qdio;
|
|
u32 hydra_version; /* Hydra version */
|
|
u32 fsf_lic_version;
|
|
u32 adapter_features; /* FCP channel features */
|
|
u32 connection_features; /* host connection features */
|
|
u32 hardware_version; /* of FCP channel */
|
|
u16 timer_ticks; /* time int for a tick */
|
|
struct Scsi_Host *scsi_host; /* Pointer to mid-layer */
|
|
struct list_head port_list; /* remote port list */
|
|
rwlock_t port_list_lock; /* port list lock */
|
|
unsigned long req_no; /* unique FSF req number */
|
|
struct zfcp_reqlist *req_list;
|
|
u32 fsf_req_seq_no; /* FSF cmnd seq number */
|
|
rwlock_t abort_lock; /* Protects against SCSI
|
|
stack abort/command
|
|
completion races */
|
|
atomic_t stat_miss; /* # missing status reads*/
|
|
unsigned int stat_read_buf_num;
|
|
struct work_struct stat_work;
|
|
atomic_t status; /* status of this adapter */
|
|
struct list_head erp_ready_head; /* error recovery for this
|
|
adapter/devices */
|
|
wait_queue_head_t erp_ready_wq;
|
|
struct list_head erp_running_head;
|
|
rwlock_t erp_lock;
|
|
wait_queue_head_t erp_done_wqh;
|
|
struct zfcp_erp_action erp_action; /* pending error recovery */
|
|
atomic_t erp_counter;
|
|
u32 erp_total_count; /* total nr of enqueued erp
|
|
actions */
|
|
u32 erp_low_mem_count; /* nr of erp actions waiting
|
|
for memory */
|
|
struct task_struct *erp_thread;
|
|
struct zfcp_fc_wka_ports *gs; /* generic services */
|
|
struct zfcp_dbf *dbf; /* debug traces */
|
|
struct zfcp_adapter_mempool pool; /* Adapter memory pools */
|
|
struct fc_host_statistics *fc_stats;
|
|
struct fsf_qtcb_bottom_port *stats_reset_data;
|
|
unsigned long stats_reset;
|
|
struct work_struct scan_work;
|
|
struct work_struct ns_up_work;
|
|
struct service_level service_level;
|
|
struct workqueue_struct *work_queue;
|
|
struct device_dma_parameters dma_parms;
|
|
struct zfcp_fc_events events;
|
|
};
|
|
|
|
struct zfcp_port {
|
|
struct device dev;
|
|
struct fc_rport *rport; /* rport of fc transport class */
|
|
struct list_head list; /* list of remote ports */
|
|
struct zfcp_adapter *adapter; /* adapter used to access port */
|
|
struct list_head unit_list; /* head of logical unit list */
|
|
rwlock_t unit_list_lock; /* unit list lock */
|
|
atomic_t units; /* zfcp_unit count */
|
|
atomic_t status; /* status of this remote port */
|
|
u64 wwnn; /* WWNN if known */
|
|
u64 wwpn; /* WWPN */
|
|
u32 d_id; /* D_ID */
|
|
u32 handle; /* handle assigned by FSF */
|
|
struct zfcp_erp_action erp_action; /* pending error recovery */
|
|
atomic_t erp_counter;
|
|
u32 maxframe_size;
|
|
u32 supported_classes;
|
|
struct work_struct gid_pn_work;
|
|
struct work_struct test_link_work;
|
|
struct work_struct rport_work;
|
|
enum { RPORT_NONE, RPORT_ADD, RPORT_DEL } rport_task;
|
|
unsigned int starget_id;
|
|
};
|
|
|
|
/**
|
|
* struct zfcp_unit - LUN configured via zfcp sysfs
|
|
* @dev: struct device for sysfs representation and reference counting
|
|
* @list: entry in LUN/unit list per zfcp_port
|
|
* @port: reference to zfcp_port where this LUN is configured
|
|
* @fcp_lun: 64 bit LUN value
|
|
* @scsi_work: for running scsi_scan_target
|
|
*
|
|
* This is the representation of a LUN that has been configured for
|
|
* usage. The main data here is the 64 bit LUN value, data for
|
|
* running I/O and recovery is in struct zfcp_scsi_dev.
|
|
*/
|
|
struct zfcp_unit {
|
|
struct device dev;
|
|
struct list_head list;
|
|
struct zfcp_port *port;
|
|
u64 fcp_lun;
|
|
struct work_struct scsi_work;
|
|
};
|
|
|
|
/**
|
|
* struct zfcp_scsi_dev - zfcp data per SCSI device
|
|
* @status: zfcp internal status flags
|
|
* @lun_handle: handle from "open lun" for issuing FSF requests
|
|
* @erp_action: zfcp erp data for opening and recovering this LUN
|
|
* @erp_counter: zfcp erp counter for this LUN
|
|
* @latencies: FSF channel and fabric latencies
|
|
* @port: zfcp_port where this LUN belongs to
|
|
*/
|
|
struct zfcp_scsi_dev {
|
|
atomic_t status;
|
|
u32 lun_handle;
|
|
struct zfcp_erp_action erp_action;
|
|
atomic_t erp_counter;
|
|
struct zfcp_latencies latencies;
|
|
struct zfcp_port *port;
|
|
};
|
|
|
|
/**
|
|
* sdev_to_zfcp - Access zfcp LUN data for SCSI device
|
|
* @sdev: scsi_device where to get the zfcp_scsi_dev pointer
|
|
*/
|
|
static inline struct zfcp_scsi_dev *sdev_to_zfcp(struct scsi_device *sdev)
|
|
{
|
|
return scsi_transport_device_data(sdev);
|
|
}
|
|
|
|
/**
|
|
* zfcp_scsi_dev_lun - Return SCSI device LUN as 64 bit FCP LUN
|
|
* @sdev: SCSI device where to get the LUN from
|
|
*/
|
|
static inline u64 zfcp_scsi_dev_lun(struct scsi_device *sdev)
|
|
{
|
|
u64 fcp_lun;
|
|
|
|
int_to_scsilun(sdev->lun, (struct scsi_lun *)&fcp_lun);
|
|
return fcp_lun;
|
|
}
|
|
|
|
/**
|
|
* struct zfcp_fsf_req - basic FSF request structure
|
|
* @list: list of FSF requests
|
|
* @req_id: unique request ID
|
|
* @adapter: adapter this request belongs to
|
|
* @qdio_req: qdio queue related values
|
|
* @completion: used to signal the completion of the request
|
|
* @status: status of the request
|
|
* @fsf_command: FSF command issued
|
|
* @qtcb: associated QTCB
|
|
* @seq_no: sequence number of this request
|
|
* @data: private data
|
|
* @timer: timer data of this request
|
|
* @erp_action: reference to erp action if request issued on behalf of ERP
|
|
* @pool: reference to memory pool if used for this request
|
|
* @issued: time when request was send (STCK)
|
|
* @handler: handler which should be called to process response
|
|
*/
|
|
struct zfcp_fsf_req {
|
|
struct list_head list;
|
|
unsigned long req_id;
|
|
struct zfcp_adapter *adapter;
|
|
struct zfcp_qdio_req qdio_req;
|
|
struct completion completion;
|
|
u32 status;
|
|
u32 fsf_command;
|
|
struct fsf_qtcb *qtcb;
|
|
u32 seq_no;
|
|
void *data;
|
|
struct timer_list timer;
|
|
struct zfcp_erp_action *erp_action;
|
|
mempool_t *pool;
|
|
unsigned long long issued;
|
|
void (*handler)(struct zfcp_fsf_req *);
|
|
};
|
|
|
|
static inline
|
|
int zfcp_adapter_multi_buffer_active(struct zfcp_adapter *adapter)
|
|
{
|
|
return atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_MB_ACT;
|
|
}
|
|
|
|
#endif /* ZFCP_DEF_H */
|