forked from mtalexander/hercules-390
/
channel.c
5894 lines (5076 loc) · 212 KB
/
channel.c
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/* CHANNEL.C (c) Copyright Roger Bowler, 1999-2012 */
/* (c) Copyright Jan Jaeger, 1999-2012 */
/* ESA/390 Channel Emulator */
/* */
/* Released under "The Q Public License Version 1" */
/* (http://www.hercules-390.org/herclic.html) as modifications to */
/* Hercules. */
/* z/Architecture support - (c) Copyright Jan Jaeger, 1999-2012 */
/*-------------------------------------------------------------------*/
/* This module contains the channel subsystem functions for the */
/* Hercules S/370 and ESA/390 emulator. */
/*-------------------------------------------------------------------*/
/*-------------------------------------------------------------------*/
/* Additional credits: */
/* Measurement block support by Jan Jaeger */
/* Fix program check on NOP due to addressing - Jan Jaeger */
/* Fix program check on TIC as first ccw on RSCH - Jan Jaeger */
/* Fix PCI intermediate status flags - Jan Jaeger */
/* 64-bit IDAW support - Roger Bowler v209 @IWZ*/
/* Incorrect-length-indication-suppression - Jan Jaeger */
/* Read backward support contributed by Hackules 13jun2002 */
/* Read backward fixes contributed by Jay Jaeger 16sep2003 */
/* MIDAW support - Roger Bowler 03aug2005 @MW*/
/*-------------------------------------------------------------------*/
#include "hstdinc.h"
#define _CHANNEL_C_
#define _HENGINE_DLL_
#include "hercules.h"
#include "devtype.h"
#include "opcode.h"
#include "chsc.h"
/* Debug Switches ---------------------------------------------------*/
#if !defined(CHANNEL_DEBUG_SWITCHES)
#define CHANNEL_DEBUG_SWITCHES
#define DEBUG_SCSW 0
#define DEBUG_PREFETCH 0
#define DEBUG_DUMP 0
#endif
/*-------------------------------------------------------------------*/
/*-------------------------------------------------------------------*/
/* External function definitions */
/*-------------------------------------------------------------------*/
DLL_EXPORT void* device_thread (void *arg);
/*-------------------------------------------------------------------*/
/* Internal function definitions */
/*-------------------------------------------------------------------*/
void call_execute_ccw_chain (int arch_mode, void* pDevBlk);
void perform_clear_subchan_locked (DEVBLK*);
static int schedule_ioq (const REGS*, DEVBLK*);
static INLINE void subchannel_interrupt_queue_cleanup (DEVBLK*);
int test_subchan_locked (REGS*, DEVBLK*, IRB*, IOINT**, SCSW**);
/*-------------------------------------------------------------------*/
/* Define I/O Buffer Structure and Inline Support Routines */
/*-------------------------------------------------------------------*/
#if !defined(IOBUF_STRUCT)
#define IOBUF_STRUCT
typedef struct
{
union
{
struct
{
u_int size; /* Buffer size */
BYTE *start; /* Start of data address */
BYTE *end; /* Last byte address */
/* Note: Remaining space from 4K page is reserved for
* debugging and future use. No mapping of the space
* is presently done.
*/
};
BYTE pad[4096]; /* Pad to a 4K page boundary */
};
BYTE data[65536]; /* Channel I/O buffer */
} IOBUF;
static INLINE void
iobuf_initialize (IOBUF *iobuf, const u_int size)
{
iobuf->size = size;
iobuf->start = (BYTE *)iobuf->data;
iobuf->end = (BYTE *)iobuf->start + (size - 1);
}
static INLINE IOBUF *
iobuf_create (u_int size)
{
IOBUF *iobuf;
size = (MIN(size, 1048576) + 4095) & ~0x0FFF;
iobuf = (IOBUF*)malloc_aligned(size + 4096, 4096);
if (iobuf != NULL)
iobuf_initialize(iobuf, size);
return iobuf;
}
static INLINE u_int
iobuf_validate (IOBUF *iobuf)
{
return
((iobuf == NULL ||
iobuf->size < 65536 ||
iobuf->start != (BYTE *)iobuf->data ||
iobuf->end != (BYTE *)iobuf->start + (iobuf->size - 1 )) ?
0 : 1);
}
static INLINE void
iobuf_destroy (IOBUF *iobuf)
{
if (iobuf == NULL)
return;
if (!iobuf_validate(iobuf))
raise(SIGSEGV);
if (iobuf->size > 65536)
free_aligned(iobuf);
}
static INLINE IOBUF *
iobuf_reallocate (IOBUF *iobuf, const u_int size)
{
IOBUF *iobufnew;
if (iobuf == NULL)
return NULL;
if (!iobuf_validate(iobuf))
raise(SIGSEGV);
iobufnew = iobuf_create(size);
if (iobufnew == NULL)
return NULL;
memcpy(iobufnew->start, iobuf->start, MIN(iobuf->size, size));
free_aligned(iobuf);
return iobufnew;
}
#endif
#if !defined(call_exit)
#define call_exit(_routine) \
do \
{ \
if (dev->hnd->##_routine != NULL) \
{ \
obtain_lock(&dev->lock); \
(dev->hnd->##_routine)(dev); \
release_lock(&dev->lock); \
} \
} while (0)
#define call_exit_locked(_routine) \
do \
{ \
if (dev->hnd->##_routine != NULL) \
(dev->hnd->##_routine)(dev); \
} while (0)
#endif
#if !defined(PREFETCH_STRUCT)
#define PREFETCH_STRUCT
/* Define 256 entries in the prefetch table */
#define PF_SIZE 256
/* IDAW Types */
enum PF_IDATYPE
{
PF_NO_IDAW = 0,
PF_IDAW1 = 1,
PF_IDAW2 = 2,
PF_MIDAW = 3
};
typedef struct /* Prefetch data structure */
{
u_int seq; /* Counter */
u_int pos; /* Highest valid position */
u_int reqcount; /* Requested count */
U8 prevcode; /* Previous CCW opcode */
U8 opcode; /* CCW opcode */
U16 reserved;
BYTE chanstat[PF_SIZE]; /* Channel status */
U32 ccwaddr[PF_SIZE]; /* CCW address (SCSW CCW) */
U32 datalen[PF_SIZE]; /* Count (length) */
RADR dataaddr[PF_SIZE]; /* Address */
U8 ccwflags[PF_SIZE]; /* CCW flags */
U16 ccwcount[PF_SIZE]; /* Count (length) */
U32 idawaddr[PF_SIZE]; /* IDAW address */
U8 idawtype[PF_SIZE]; /* IDAW type */
U8 idawflag[PF_SIZE]; /* IDAW flags */
} PREFETCH;
#endif
#if !defined(IODELAY)
#if defined(OPTION_IODELAY_KLUDGE)
#define IODELAY(_dev) \
iodelay(_dev)
static void INLINE
iodelay (const DEVBLK* dev)
{
if (sysblk.iodelay > 0 && dev->devchar[10] == 0x20)
usleep(sysblk.iodelay);
}
#else
#define IODELAY(_dev)
#endif
#endif
#if !defined(CHADDRCHK)
#define CHADDRCHK(_addr,_dev) \
chaddrchk((_addr),(_dev))
static INLINE int
chaddrchk(const RADR addr, const DEVBLK* dev)
{
return ((addr > dev->mainlim)
//#if defined(FEATURE_ADDRESS_LIMIT_CHECKING)
|| ((dev->orb.flag5 & ORB5_A) &&
(((dev->pmcw.flag5 & PMCW5_LM_LOW) &&
(addr < sysblk.addrlimval)) ||
((dev->pmcw.flag5 & PMCW5_LM_HIGH) &&
(addr >= sysblk.addrlimval)) ) )
//#endif /*defined(FEATURE_ADDRESS_LIMIT_CHECKING)*/
);
}
#endif
#if !defined(_CHANNEL_C)
#define _CHANNEL_C
/*--------------------------------------------------------------------*/
/* Queue I/O interrupt and update status (locked) */
/* */
/* Locks Held on Entry */
/* dev->lock */
/* sysblk.intlock */
/* Locks Held on Return */
/* dev->lock */
/* sysblk.intlock */
/* Locks Used */
/* sysblk.iointqlk */
/*--------------------------------------------------------------------*/
static INLINE void
queue_io_interrupt_and_update_status_locked(DEVBLK* dev)
{
SCSW* scsw = &dev->scsw;
IOINT* ioint = &dev->ioint;
/* Get the I/O interrupt queue lock */
obtain_lock(&sysblk.iointqlk);
/* Queue the interrupt */
queue_io_interrupt_qlocked(&dev->ioint);
/* Perform cleanup for DEVBLK flags being deprecated */
subchannel_interrupt_queue_cleanup(dev);
/* Update interrupts */
UPDATE_IC_IOPENDING_QLOCKED();
/* Release the I/O interrupt queue lock */
release_lock(&sysblk.iointqlk);
/* Wake up any waiters if the device isn't active or reserved */
if (!scsw_flag3(SCSW3_AC_SCHAC | SCSW3_AC_DEVAC) &&
!dev->reserved)
{
dev->ioactive = DEV_SYS_NONE;
if (dev->iowaiters)
signal_condition (&dev->iocond);
}
}
/*--------------------------------------------------------------------*/
/* Queue I/O interrupt and update status */
/* */
/* Locks Held on Entry */
/* None */
/* Locks Held on Return */
/* None */
/* Locks Used */
/* dev->lock */
/* sysblk.intlock */
/* sysblk.iointqlk */
/*--------------------------------------------------------------------*/
static INLINE void
queue_io_interrupt_and_update_status(DEVBLK* dev)
{
SCSW* scsw = &dev->scsw;
if (scsw_status_pending(scsw))
{
OBTAIN_INTLOCK(NULL);
obtain_lock(&dev->lock);
queue_io_interrupt_and_update_status_locked(dev);
release_lock(&dev->lock);
RELEASE_INTLOCK(NULL);
}
else /* No interrupt pending */
{
/* Wake up any waiters if the device isn't active or reserved */
if (!(scsw_flag3(SCSW3_AC_SCHAC | SCSW3_AC_DEVAC)) &&
!dev->reserved)
{
obtain_lock(&dev->lock);
dev->ioactive = DEV_SYS_NONE;
if (dev->iowaiters)
signal_condition (&dev->iocond);
release_lock(&dev->lock);
}
}
}
/*-------------------------------------------------------------------*/
/* Copy memory backwards for READ BACKWARDS */
/* */
/* Note: Routines exist that use READ BACKWARDS and PCI, processing */
/* data as copied. Consequently, memory copying must be done */
/* backwards to ensure that these routines have little chance */
/* of failure. */
/* */
/*-------------------------------------------------------------------*/
static INLINE void
memcpy_backwards ( BYTE *to, BYTE *from, int length )
{
if (length)
{
for (to += length, from += length; length; --length)
*(--to) = *(--from);
}
}
/*-------------------------------------------------------------------*/
/* FORMAT DATA */
/*-------------------------------------------------------------------*/
#if !defined(format_data)
# define format_data(_buffer,_buflen,_data,_datalen) \
_format_data((BYTE *)(_buffer),(u_int)(_buflen), \
(BYTE *)(_data),(u_int)(_datalen))
#endif
static INLINE void
_format_data ( BYTE *buffer, const u_int buflen,
const BYTE *a, const u_int len )
{
u_int i, k; /* Array subscripts */
int j;
k = MIN(len, 16);
if (k)
{
j = snprintf((char *)buffer, buflen,
"%2.2X%2.2X%2.2X%2.2X %2.2X%2.2X%2.2X%2.2X "
"%2.2X%2.2X%2.2X%2.2X %2.2X%2.2X%2.2X%2.2X",
a[0], a[1], a[2], a[3], a[4], a[5], a[6], a[7],
a[8], a[9], a[10], a[11], a[12], a[13], a[14], a[15]);
if (j < 0)
*buffer = 0;
else
{
/* Blank out unused data */
if (k != 16)
{
i = (k << 1) + (k >> 2);
memset(buffer + i, ' ', j - i);
}
/* If space is available, add translation */
if ((u_int)j < buflen)
{
/* Insert blank separator */
buffer[j++] = ' ';
/* If space still available, complete translation */
if ((u_int)j < buflen)
{
/* Adjust data display size if necessary */
if ((j + k) > buflen)
k = buflen - j;
/* Append translation */
prt_guest_to_host(a, buffer + j, k);
}
}
}
}
else
*buffer = 0;
} /* end function format_data */
/*-------------------------------------------------------------------*/
/* FORMAT I/O BUFFER DATA */
/*-------------------------------------------------------------------*/
static INLINE void
format_iobuf_data ( const RADR addr, BYTE *dest, const DEVBLK *dev,
const u_int len )
{
u_int k; /* Array subscripts */
BYTE workarea[17]; /* Character string work */
k = MIN(len, sizeof(workarea)-1);
k = MIN(k, (addr < dev->mainlim) ? (dev->mainlim - addr) : 0);
if (k)
{
memcpy(workarea, dev->mainstor + addr, k);
memcpy(dest, "=>", 2);
format_data(dest + 2, 52, workarea, k);
}
else
*dest = 0;
} /* end function format_iobuf_data */
/*-------------------------------------------------------------------*/
/* Dump data block */
/*-------------------------------------------------------------------*/
#define dump(_desc,_addr,_len) \
_dump((char *)(_desc),(BYTE *)(_addr),(u_int)(_len))
static void
_dump ( const char *description, BYTE *addr, const u_int len )
{
int i;
int k = MIN(len, 65536);
BYTE *limit;
char msgbuf[133];
if (k)
{
/* Set limit */
limit = addr + k;
if (description &&
description != NULL &&
description[0])
WRMSG(HHC90000, "I", description);
for (i = 0; addr < limit; addr += 16, i += 16, k -= 16)
{
MSGBUF(msgbuf, "%4.4X => ", i);
format_data(msgbuf+9, sizeof(msgbuf)-9, addr, k);
WRMSG(HHC90000, "I", msgbuf);
}
}
} /* end function dump */
/*-------------------------------------------------------------------*/
/* Dump Storage */
/*-------------------------------------------------------------------*/
#define dump_storage(_desc,_addr,_len) \
_dump_storage \
((char *)(_desc),(RADR)(_addr),(u_int)(_len))
static void
_dump_storage ( const char *description,
RADR addr, const u_int len )
{
u_int k = MIN(MIN(len,
(addr < sysblk.mainsize) ?
(sysblk.mainsize - addr) : 0),
65536);
BYTE *storage; /* Real storage address */
BYTE *limit; /* Display limit */
char msgbuf[133]; /* Message buffer */
/* Set length to fully reside within defined storage */
k = MIN(len,
(addr < sysblk.mainsize) ? (sysblk.mainsize - addr) : 0);
if (k)
{
k = MIN(k, 65536);
storage = sysblk.mainstor + addr;
limit = storage + k;
if (description &&
description != NULL &&
description[0])
WRMSG(HHC90000, "I", description);
if (sysblk.mainsize > 2*ONE_GIGABYTE)
for (; storage < limit; addr += 16, storage += 16, k -= 16)
{
MSGBUF(msgbuf, I64_FMTX" => ", addr);
format_data(msgbuf+20, sizeof(msgbuf)-20, storage, k);
WRMSG(HHC90000, "I", msgbuf);
}
else
for (; storage < limit; addr += 16, storage += 16, k -= 16)
{
MSGBUF(msgbuf, "%8.8X => ", (u_int)addr);
format_data(msgbuf+12, sizeof(msgbuf)-12, storage, k);
WRMSG(HHC90000, "I", msgbuf);
}
}
} /* end function dump_storage */
/*-------------------------------------------------------------------*/
/* DISPLAY CHANNEL COMMAND WORD AND DATA */
/*-------------------------------------------------------------------*/
static void
display_ccw ( const DEVBLK *dev, const BYTE ccw[], const U32 addr,
const U32 count, const U8 flags )
{
BYTE area[64]; /* Data display area */
UNREFERENCED(flags);
if (IS_CCW_READ(ccw[0]) ||
IS_CCW_IMMEDIATE(dev, ccw[0]) ||
IS_CCW_TIC(ccw[0]) ||
IS_CCW_SENSE(ccw[0]))
area[0] = 0;
else
format_iobuf_data (addr, area, dev, count);
WRMSG (HHC01315, "I", SSID_TO_LCSS(dev->ssid), dev->devnum,
ccw[0], ccw[1], ccw[2], ccw[3],
ccw[4], ccw[5], ccw[6], ccw[7], area);
} /* end function display_ccw */
/*-------------------------------------------------------------------*/
/* Display IDAW and Data */
/*-------------------------------------------------------------------*/
static void
display_idaw ( const DEVBLK *dev, const BYTE type, const BYTE flag,
const RADR addr, const U16 count )
{
BYTE area[64]; /* Data display area */
format_iobuf_data( addr, area, dev, count );
switch(type)
{
case PF_IDAW1:
WRMSG (HHC01302, "I", SSID_TO_LCSS(dev->ssid), dev->devnum,
(U32)addr, count, area);
break;
case PF_IDAW2:
WRMSG (HHC01303, "I", SSID_TO_LCSS(dev->ssid), dev->devnum,
(U64)addr, count, area);
break;
case PF_MIDAW:
WRMSG (HHC01301, "I", SSID_TO_LCSS(dev->ssid), dev->devnum,
flag, count, (U64)addr, area);
}
}
/*-------------------------------------------------------------------*/
/* DISPLAY CHANNEL STATUS WORD */
/*-------------------------------------------------------------------*/
static void
display_csw (const DEVBLK *dev, const BYTE csw[])
{
WRMSG (HHC01316, "I", SSID_TO_LCSS(dev->ssid), dev->devnum,
csw[0],
csw[4], csw[5], csw[6], csw[7],
csw[1], csw[2], csw[3]);
} /* end function display_csw */
/*-------------------------------------------------------------------*/
/* DISPLAY SUBCHANNEL STATUS WORD */
/*-------------------------------------------------------------------*/
static void
display_scsw (const DEVBLK *dev, const SCSW scsw)
{
switch (sysblk.arch_mode)
{
case ARCH_370:
{
U8 csw[8];
scsw2csw(&scsw, csw);
display_csw (dev, csw);
break;
}
default:
WRMSG (HHC01317, "I", SSID_TO_LCSS(dev->ssid), dev->devnum,
scsw.flag0, scsw.flag1, scsw.flag2, scsw.flag3,
scsw.unitstat, scsw.chanstat,
scsw.count[0], scsw.count[1],
scsw.ccwaddr[0], scsw.ccwaddr[1],
scsw.ccwaddr[2], scsw.ccwaddr[3]);
break;
}
} /* end function display_scsw */
/*-------------------------------------------------------------------*/
/* Display prefetch table */
/*-------------------------------------------------------------------*/
#if DEBUG_PREFETCH
static void
display_prefetch (PREFETCH *prefetch, const u_int ps,
const u_int count, const u_int residual,
const u_int more)
{
u_int limit = MIN(prefetch->seq, PF_SIZE);
u_int ts;
u_int used = count - residual;
char msgbuf[133];
MSGBUF(msgbuf, "Prefetch ps=%d count=%d (%4.4X) "
"residual=%d (%4.4X) more=%d used=%d (%4.4X)",
ps, count, count, residual, residual, more,
used, used);
WRMSG(HHC90000, "I", msgbuf);
MSGBUF(msgbuf, "Prefetch seq=%d req=%d (%4.4X) pos=%d (%4.4X) "
"prevcode=%2.2X code=%2.2X",
prefetch->seq, prefetch->reqcount,
prefetch->reqcount, prefetch->pos, prefetch->pos,
prefetch->prevcode, prefetch->opcode);
WRMSG(HHC90000, "I", msgbuf);
MSGBUF(msgbuf,
"Prefetch "
" n " /* ts */
" " /* Select pointer */
"cs " /* Channel Status */
"scsw-ccw " /* CCW Address */
"data-len " /* Data length */
" data-address " /* Data address */
"fl " /* CCW Flags */
" count " /* CCW Count */
"idawaddr " /* IDAW Address */
"it " /* IDAW Type */
"if" /* IDAW Flag */
);
WRMSG(HHC90000, "I", msgbuf);
for (ts = 0; ts < limit; ts++)
{
MSGBUF(msgbuf,
"Prefetch "
"%3d " /* ts */
"%2s" /* Select pointer (ps) */
"%2.2X " /* Channel Status */
"%8.8X " /* CCW Address (SCSW CCW Address) */
"%8.8X " /* Data length */
I64_FMTX" " /* Data address */
"%2.2X " /* CCW Flags */
"%8.8X " /* CCW Count */
"%8.8X " /* IDAW Address */
"%2d " /* IDAW Type */
"%2.2X", /* IDAW Flag */
ts, ((ps == ts) ? "->" : " "),
prefetch->chanstat[ts], prefetch->ccwaddr[ts],
prefetch->datalen[ts], prefetch->dataaddr[ts],
prefetch->ccwflags[ts], prefetch->ccwcount[ts],
prefetch->idawaddr[ts], prefetch->idawtype[ts],
prefetch->idawflag[ts]);
WRMSG(HHC90000, "I", msgbuf);
}
}
#else
#define display_prefetch(_prefetch, _ps, _count, _residual, _more)
#endif
/*-------------------------------------------------------------------*/
/* Signal subchannel to halt or clear */
/*-------------------------------------------------------------------*/
/* Locks held on entry/exit */
/* dev->lock */
/*-------------------------------------------------------------------*/
static void
signal_subchannel_halt_or_clear_pending(DEVBLK* dev, const BYTE ac)
{
SCSW* scsw = &dev->scsw;
/* Set activity control */
scsw_set_flag2(ac);
/* If the device is busy then signal subchannel to halt */
if ((dev->busy && dev->ioactive == DEV_SYS_LOCAL) ||
(!scsw_start_function(scsw) &&
(scsw_resume_pending(scsw) ||
scsw_start_pending(scsw)) ||
dev->startpending) ||
scsw_suspended(scsw) || dev->suspended)
{
/* Signal the subchannel to resume if it is suspended */
if (scsw_suspended(scsw))
{
scsw_set_resume_pending(scsw);
schedule_ioq(NULL, dev);
}
/* Otherwise, active I/O processing will complete action */
}
else /* Device not started */
{
int not_in_queue = 1;
/* Determine if the device is in the IOQ */
obtain_lock(&sysblk.ioqlock);
if (dev->startpending)
{
if (sysblk.ioq == dev)
sysblk.ioq = dev->nextioq;
else if ( sysblk.ioq != NULL )
{
DEVBLK* tmp;
/* Locate IOQ entry */
for (tmp = sysblk.ioq;
tmp->nextioq != NULL && tmp->nextioq != dev;
tmp = tmp->nextioq);
if(tmp->nextioq == dev)
not_in_queue = 0;
}
}
release_lock(&sysblk.ioqlock);
/* Queue request if not found in the I/O queue */
if (not_in_queue)
schedule_ioq(NULL, dev);
}
}
/*-------------------------------------------------------------------*/
/* STORE CHANNEL ID */
/*-------------------------------------------------------------------*/
int
stchan_id (REGS *regs, U16 chan)
{
U32 chanid; /* Channel identifier word */
int devcount = 0; /* #of devices on channel */
DEVBLK *dev; /* -> Device control block */
PSA_3XX *psa; /* -> Prefixed storage area */
/* Find a device on specified channel */
for (dev = sysblk.firstdev; dev != NULL; dev = dev->nextdev)
{
/* Skip the device if not on specified channel */
if ((dev->devnum & 0xFF00) != chan
|| (dev->pmcw.flag5 & PMCW5_V) == 0
#if defined(FEATURE_CHANNEL_SWITCHING)
|| regs->chanset != dev->chanset
#endif /*defined(FEATURE_CHANNEL_SWITCHING)*/
)
continue;
/* Found device on the channel */
devcount++;
break;
} /* end for(dev) */
/* Exit with condition code 3 if no devices on channel */
if (devcount == 0)
return 3;
/* Construct the channel id word
*
* According to GA22-7000-4, Page 192, 2nd paragraph, channel 0 is a
* Byte Multiplexor.. Return STIDC data accordingly.
* ISW 20080313
*/
if(!chan)
{
chanid = CHANNEL_MPX;
}
else
{
/* Translate channel type back to S/370 terms */
switch (dev->chptype[0])
{
case CHP_TYPE_UNDEF:
chanid = CHANNEL_SEL;
break;
case CHP_TYPE_BYTE:
chanid = CHANNEL_MPX;
break;
default:
chanid = CHANNEL_BMX;
break;
}
}
/* Store the channel id word at PSA+X'A8' */
psa = (PSA_3XX*)(regs->mainstor + regs->PX);
STORE_FW(psa->chanid, chanid);
/* Exit with condition code 0 indicating channel id stored */
return 0;
} /* end function stchan_id */
/*-------------------------------------------------------------------*/
/* TEST CHANNEL */
/*-------------------------------------------------------------------*/
int
testch (REGS *regs, U16 chan)
{
DEVBLK *dev; /* -> Device control block */
int devcount = 0; /* Number of devices found */
int cc = 0; /* Returned condition code */
/* Scan devices on the channel */
for (dev = sysblk.firstdev; dev != NULL; dev = dev->nextdev)
{
/* Skip the device if not on specified channel */
if ((dev->devnum & 0xFF00) != chan
|| (dev->pmcw.flag5 & PMCW5_V) == 0
#if defined(FEATURE_CHANNEL_SWITCHING)
|| regs->chanset != dev->chanset
#endif /*defined(FEATURE_CHANNEL_SWITCHING)*/
)
continue;
/* Increment device count on this channel */
devcount++;
/* Test for pending interrupt */
if (subchannel_status_pending(dev))
{
cc = 1;
break;
}
}
/* Set condition code 3 if no devices found on the channel */
if (devcount == 0)
cc = 3;
return cc;
} /* end function testch */
/*-------------------------------------------------------------------*/
/* TEST I/O */
/*-------------------------------------------------------------------*/
int
testio (REGS *regs, DEVBLK *dev, BYTE ibyte)
{
int cc; /* Condition code */
IRB irb; /* Interrupt request block */
IOINT* ioint; /* -> I/O interrupt */
SCSW* scsw; /* -> SCSW */
UNREFERENCED(ibyte);
OBTAIN_INTLOCK(regs);
obtain_lock(&dev->lock);
/* Test device status and set condition code */
if ((dev->busy && dev->ioactive == DEV_SYS_LOCAL)
|| dev->startpending)
{
/* Set condition code 2 for device busy */
cc = 2;
}
else if (subchannel_status_pending(dev))
{
/* Issue TEST SUBCHANNEL */
cc = test_subchan_locked (regs, dev, &irb, &ioint, &scsw);
if (cc) /* Status incomplete */
cc = 2;
else /* Status pending */
{
/* Obtain I/O interrupt queue lock */
obtain_lock(&sysblk.iointqlk);
/* Dequeue the interrupt */
dequeue_io_interrupt_qlocked(ioint);
/* Store the channel status word at PSA+X'40' */
store_scsw_as_csw(regs, &irb.scsw);
/* Set condition code 1 for CSW stored */
cc = 1;
/* Cleanup after SCSW */
subchannel_interrupt_queue_cleanup(dev);
UPDATE_IC_IOPENDING_QLOCKED();
/* Release I/O interrupt queue lock */
release_lock(&sysblk.iointqlk);
}
}
else
cc = 0;
if (dev->ccwtrace || dev->ccwstep)
WRMSG (HHC01318, "I", SSID_TO_LCSS(dev->ssid), dev->devnum, cc);
/* Complete unlock sequence */
release_lock(&dev->lock);
RELEASE_INTLOCK(regs);
/* Return the condition code */
return (cc);
} /* end function testio */
/*-------------------------------------------------------------------*/
/* HALT I/O */
/*-------------------------------------------------------------------*/
int
haltio (REGS *regs, DEVBLK *dev, BYTE ibyte)
{
int cc; /* Condition code */
PSA_3XX *psa; /* -> Prefixed storage area */
UNREFERENCED(ibyte);
if (dev->ccwtrace || dev->ccwstep)
WRMSG (HHC01329, "I", SSID_TO_LCSS(dev->ssid), dev->devnum);
OBTAIN_INTLOCK(regs);
obtain_lock (&dev->lock);
/* Test device status and set condition code */
if (dev->busy)
{
/* Invoke the provided halt device routine @ISW */
/* if it has been provided by the handler @ISW */
/* code at init @ISW */
if(dev->hnd->halt!=NULL) /* @ISW */
{ /* @ISW */
release_lock(&dev->lock);
RELEASE_INTLOCK(regs);
obtain_lock(&dev->lock);
dev->hnd->halt(dev); /* @ISW */
release_lock(&dev->lock);
OBTAIN_INTLOCK(regs);
obtain_lock(&dev->lock);
cc=0; /* @ISW */
} /* @ISW */
else
{
/* Set condition code 2 if device is busy */
cc = 2;
/* Tell channel and device to halt */
signal_subchannel_halt_or_clear_pending(dev, SCSW2_AC_HALT);
/* Clear pending interrupts */
obtain_lock(&sysblk.iointqlk);
dev->pciscsw.flag3 &= ~(SCSW3_SC_ALERT |
SCSW3_SC_PRI |
SCSW3_SC_SEC |
SCSW3_SC_PEND);
dev->scsw.flag3 &= ~(SCSW3_SC_ALERT |
SCSW3_SC_PRI |
SCSW3_SC_SEC |
SCSW3_SC_PEND);
dev->attnscsw.flag3 &= ~(SCSW3_SC_ALERT |
SCSW3_SC_PRI |
SCSW3_SC_SEC |
SCSW3_SC_PEND);
DEQUEUE_IO_INTERRUPT_QLOCKED(&dev->pciioint);
DEQUEUE_IO_INTERRUPT_QLOCKED(&dev->ioint);
DEQUEUE_IO_INTERRUPT_QLOCKED(&dev->attnioint);
subchannel_interrupt_queue_cleanup(dev);
release_lock(&sysblk.iointqlk);
}
}
else if (!subchannel_status_pending(dev))
{
/* Set condition code 1 */
cc = 1;
/* Store the channel status word at PSA+X'40' */
store_scsw_as_csw(regs, &dev->scsw);