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android_kernel_motorola_sm6225/drivers/s390/scsi/zfcp_def.h
Christof Schmitt b6bd2fb92a [SCSI] zfcp: Move FSF request tracking code to new file 
Move the code for tracking FSF requests to new file to have this code
in one place. The functions for adding and removing requests on the
I/O path are already inline. The alloc and free functions are only
called once, so it does not hurt to inline them and add them to the
same file.

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2010-02-17 17:46:19 -06:00

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/*
* zfcp device driver
*
* Global definitions for the zfcp device driver.
*
* Copyright IBM Corporation 2002, 2009
*/
#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/qdio.h>
#include <asm/debug.h>
#include <asm/ebcdic.h>
#include <asm/sysinfo.h>
#include "zfcp_fsf.h"
struct zfcp_reqlist;
/********************* SCSI SPECIFIC DEFINES *********************************/
#define ZFCP_SCSI_ER_TIMEOUT (10*HZ)
/********************* CIO/QDIO SPECIFIC DEFINES *****************************/
/* DMQ bug workaround: don't use last SBALE */
#define ZFCP_MAX_SBALES_PER_SBAL (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
/* index of last SBALE (with respect to DMQ bug workaround) */
#define ZFCP_LAST_SBALE_PER_SBAL (ZFCP_MAX_SBALES_PER_SBAL - 1)
/* max. number of (data buffer) SBALEs in largest SBAL chain */
#define ZFCP_MAX_SBALES_PER_REQ \
(FSF_MAX_SBALS_PER_REQ * ZFCP_MAX_SBALES_PER_SBAL - 2)
/* request ID + QTCB in SBALE 0 + 1 of first SBAL in chain */
#define ZFCP_MAX_SECTORS (ZFCP_MAX_SBALES_PER_REQ * 8)
/* max. number of (data buffer) SBALEs in largest SBAL chain
multiplied with number of sectors per 4k block */
/********************* 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_QDIOUP 0x00000002
#define ZFCP_STATUS_ADAPTER_XCONFIG_OK 0x00000008
#define ZFCP_STATUS_ADAPTER_HOST_CON_INIT 0x00000010
#define ZFCP_STATUS_ADAPTER_ERP_PENDING 0x00000100
#define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED 0x00000200
/* remote port status */
#define ZFCP_STATUS_PORT_PHYS_OPEN 0x00000001
#define ZFCP_STATUS_PORT_LINK_TEST 0x00000002
/* logical unit status */
#define ZFCP_STATUS_UNIT_SHARED 0x00000004
#define ZFCP_STATUS_UNIT_READONLY 0x00000008
/* FSF request status (this does not have a common part) */
#define ZFCP_STATUS_FSFREQ_TASK_MANAGEMENT 0x00000002
#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 *status_read_data;
mempool_t *gid_pn;
mempool_t *qtcb_pool;
};
struct zfcp_qdio_queue {
struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
u8 first; /* index of next free bfr in queue */
atomic_t count; /* number of free buffers in queue */
};
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 zfcp_unit *unit;
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_qdio - basic QDIO data structure
* @resp_q: response queue
* @req_q: request queue
* @stat_lock: lock to protect req_q_util and req_q_time
* @req_q_lock; lock to serialize access to request queue
* @req_q_time: time of last fill level change
* @req_q_util: used for accounting
* @req_q_full: queue full incidents
* @req_q_wq: used to wait for SBAL availability
* @adapter: adapter used in conjunction with this QDIO structure
*/
struct zfcp_qdio {
struct zfcp_qdio_queue resp_q;
struct zfcp_qdio_queue req_q;
spinlock_t stat_lock;
spinlock_t req_q_lock;
unsigned long long req_q_time;
u64 req_q_util;
atomic_t req_q_full;
wait_queue_head_t req_q_wq;
struct zfcp_adapter *adapter;
};
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*/
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 service_level service_level;
struct workqueue_struct *work_queue;
};
struct zfcp_port {
struct device sysfs_device; /* sysfs device */
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 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;
};
struct zfcp_unit {
struct device sysfs_device; /* sysfs device */
struct list_head list; /* list of logical units */
struct zfcp_port *port; /* remote port of unit */
atomic_t status; /* status of this logical unit */
u64 fcp_lun; /* own FCP_LUN */
u32 handle; /* handle assigned by FSF */
struct scsi_device *device; /* scsi device struct pointer */
struct zfcp_erp_action erp_action; /* pending error recovery */
atomic_t erp_counter;
struct zfcp_latencies latencies;
struct work_struct scsi_work;
};
/**
* struct zfcp_queue_req - queue related values for a request
* @sbal_number: number of free SBALs
* @sbal_first: first SBAL for this request
* @sbal_last: last SBAL for this request
* @sbal_limit: last possible SBAL for this request
* @sbale_curr: current SBALE at creation of this request
* @sbal_response: SBAL used in interrupt
* @qdio_outb_usage: usage of outbound queue
* @qdio_inb_usage: usage of inbound queue
*/
struct zfcp_queue_req {
u8 sbal_number;
u8 sbal_first;
u8 sbal_last;
u8 sbal_limit;
u8 sbale_curr;
u8 sbal_response;
u16 qdio_outb_usage;
u16 qdio_inb_usage;
};
/**
* struct zfcp_fsf_req - basic FSF request structure
* @list: list of FSF requests
* @req_id: unique request ID
* @adapter: adapter this request belongs to
* @queue_req: 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)
* @unit: reference to unit if this request is a SCSI request
* @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_queue_req queue_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;
struct zfcp_unit *unit;
void (*handler)(struct zfcp_fsf_req *);
};
/* driver data */
struct zfcp_data {
struct scsi_host_template scsi_host_template;
struct scsi_transport_template *scsi_transport_template;
struct kmem_cache *gpn_ft_cache;
struct kmem_cache *qtcb_cache;
struct kmem_cache *sr_buffer_cache;
struct kmem_cache *gid_pn_cache;
struct kmem_cache *adisc_cache;
};
/********************** ZFCP SPECIFIC DEFINES ********************************/
#define ZFCP_SET 0x00000100
#define ZFCP_CLEAR 0x00000200
#endif /* ZFCP_DEF_H */
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