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#ifndef S390_IO_SCH_H
#define S390_IO_SCH_H
#include <linux/types.h>
#include <asm/schid.h>
#include <asm/ccwdev.h>
#include "css.h"
#include "orb.h"
struct io_subchannel_private {
union orb orb; /* operation request block */
struct ccw1 sense_ccw; /* static ccw for sense command */
} __attribute__ ((aligned(8)));
#define to_io_private(n) ((struct io_subchannel_private *)n->private)
#define sch_get_cdev(n) (dev_get_drvdata(&n->dev))
#define sch_set_cdev(n, c) (dev_set_drvdata(&n->dev, c))
#define MAX_CIWS 8
/*
* Possible status values for a CCW request's I/O.
*/
enum io_status {
IO_DONE,
IO_RUNNING,
IO_STATUS_ERROR,
IO_PATH_ERROR,
IO_REJECTED,
IO_KILLED
};
/**
* ccw_request - Internal CCW request.
* @cp: channel program to start
* @timeout: maximum allowable time in jiffies between start I/O and interrupt
* @maxretries: number of retries per I/O operation and path
* @lpm: mask of paths to use
* @check: optional callback that determines if results are final
* @filter: optional callback to adjust request status based on IRB data
* @callback: final callback
* @data: user-defined pointer passed to all callbacks
* @singlepath: if set, use only one path from @lpm per start I/O
* @cancel: non-zero if request was cancelled
* @done: non-zero if request was finished
* @mask: current path mask
* @retries: current number of retries
* @drc: delayed return code
*/
struct ccw_request {
struct ccw1 *cp;
unsigned long timeout;
u16 maxretries;
u8 lpm;
int (*check)(struct ccw_device *, void *);
enum io_status (*filter)(struct ccw_device *, void *, struct irb *,
enum io_status);
void (*callback)(struct ccw_device *, void *, int);
void *data;
unsigned int singlepath:1;
/* These fields are used internally. */
unsigned int cancel:1;
unsigned int done:1;
u16 mask;
u16 retries;
int drc;
} __attribute__((packed));
/*
* sense-id response buffer layout
*/
struct senseid {
/* common part */
u8 reserved; /* always 0x'FF' */
u16 cu_type; /* control unit type */
u8 cu_model; /* control unit model */
u16 dev_type; /* device type */
u8 dev_model; /* device model */
u8 unused; /* padding byte */
/* extended part */
struct ciw ciw[MAX_CIWS]; /* variable # of CIWs */
} __attribute__ ((packed, aligned(4)));
enum cdev_todo {
CDEV_TODO_NOTHING,
CDEV_TODO_ENABLE_CMF,
CDEV_TODO_REBIND,
CDEV_TODO_REGISTER,
CDEV_TODO_UNREG,
CDEV_TODO_UNREG_EVAL,
};
struct ccw_device_private {
struct ccw_device *cdev;
struct subchannel *sch;
int state; /* device state */
atomic_t onoff;
struct ccw_dev_id dev_id; /* device id */
struct subchannel_id schid; /* subchannel number */
struct ccw_request req; /* internal I/O request */
int iretry;
u8 pgid_valid_mask; /* mask of valid PGIDs */
u8 pgid_todo_mask; /* mask of PGIDs to be adjusted */
u8 pgid_reset_mask; /* mask of PGIDs which were reset */
u8 path_gone_mask; /* mask of paths, that became unavailable */
u8 path_new_mask; /* mask of paths, that became available */
struct {
unsigned int fast:1; /* post with "channel end" */
unsigned int repall:1; /* report every interrupt status */
unsigned int pgroup:1; /* do path grouping */
unsigned int force:1; /* allow forced online */
unsigned int mpath:1; /* do multipathing */
} __attribute__ ((packed)) options;
struct {
unsigned int esid:1; /* Ext. SenseID supported by HW */
unsigned int dosense:1; /* delayed SENSE required */
unsigned int doverify:1; /* delayed path verification */
unsigned int donotify:1; /* call notify function */
unsigned int recog_done:1; /* dev. recog. complete */
unsigned int fake_irb:1; /* deliver faked irb */
unsigned int resuming:1; /* recognition while resume */
unsigned int pgroup:1; /* pathgroup is set up */
unsigned int mpath:1; /* multipathing is set up */
unsigned int initialized:1; /* set if initial reference held */
} __attribute__((packed)) flags;
unsigned long intparm; /* user interruption parameter */
struct qdio_irq *qdio_data;
struct irb irb; /* device status */
struct senseid senseid; /* SenseID info */
struct pgid pgid[8]; /* path group IDs per chpid*/
struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */
struct work_struct todo_work;
enum cdev_todo todo;
wait_queue_head_t wait_q;
struct timer_list timer;
void *cmb; /* measurement information */
struct list_head cmb_list; /* list of measured devices */
u64 cmb_start_time; /* clock value of cmb reset */
void *cmb_wait; /* deferred cmb enable/disable */
};
static inline int rsch(struct subchannel_id schid)
{
register struct subchannel_id reg1 asm("1") = schid;
int ccode;
asm volatile(
" rsch\n"
" ipm %0\n"
" srl %0,28"
: "=d" (ccode)
: "d" (reg1)
: "cc", "memory");
return ccode;
}
static inline int hsch(struct subchannel_id schid)
{
register struct subchannel_id reg1 asm("1") = schid;
int ccode;
asm volatile(
" hsch\n"
" ipm %0\n"
" srl %0,28"
: "=d" (ccode)
: "d" (reg1)
: "cc");
return ccode;
}
static inline int xsch(struct subchannel_id schid)
{
register struct subchannel_id reg1 asm("1") = schid;
int ccode;
asm volatile(
" .insn rre,0xb2760000,%1,0\n"
" ipm %0\n"
" srl %0,28"
: "=d" (ccode)
: "d" (reg1)
: "cc");
return ccode;
}
#endif
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