Viewing file:  s390io.c (170.83 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* drivers/s390/s390io.c
* S/390 common I/O routines
*
* S390 version
* Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH,
* IBM Corporation
* Author(s): Ingo Adlung (adlung@de.ibm.com)
* Cornelia Huck (cohuck@de.ibm.com)
* ChangeLog: 01/07/2001 Blacklist cleanup (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
* 01/04/2001 Holger Smolinski (smolinsk@de.ibm.com)
* Fixed lost interrupts and do_adapter_IO
* xx/xx/xxxx nnn multiple changes not reflected
* 03/12/2001 Ingo Adlung blacklist= - changed to cio_ignore=
* 03/14/2001 Ingo Adlung disable interrupts before start_IO
* in Path Group processing
* decrease retry2 on busy while
* disabling sync_isc; reset isc_cnt
* on io error during sync_isc enablement
* 05/09/2001 Cornelia Huck added exploitation of debug feature
* 05/16/2001 Cornelia Huck added /proc/deviceinfo/<devno>/
* 05/22/2001 Cornelia Huck added /proc/cio_ignore
* un-ignore blacklisted devices by piping
* to /proc/cio_ignore
* xx/xx/xxxx some bugfixes & cleanups
* 08/02/2001 Cornelia Huck not already known devices can be blacklisted
* by piping to /proc/cio_ignore
* 09/xx/2001 couple more fixes
* 10/29/2001 Cornelia Huck Blacklisting reworked again
* 10/29/2001 Cornelia Huck improved utilization of debug feature
*/
#include <linux/module.h>
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/smp.h>
#include <linux/threads.h>
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
#endif
#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/bitops.h>
#include <asm/smp.h>
#include <asm/pgtable.h>
#include <asm/delay.h>
#include <asm/processor.h>
#include <asm/lowcore.h>
#include <asm/idals.h>
#include <asm/uaccess.h>
#include <asm/cpcmd.h>
#include <asm/s390io.h>
#include <asm/s390dyn.h>
#include <asm/s390mach.h>
#include <asm/debug.h>
#include <asm/queue.h>
#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif
#define SANITY_CHECK(irq) do { \
if (irq > highest_subchannel || irq < 0) \
return (-ENODEV); \
if (ioinfo[irq] == INVALID_STORAGE_AREA) \
return (-ENODEV); \
} while(0)
#undef CONFIG_DEBUG_IO
#define CONFIG_DEBUG_CRW
unsigned int highest_subchannel;
ioinfo_t *ioinfo_head = NULL;
ioinfo_t *ioinfo_tail = NULL;
ioinfo_t *ioinfo[__MAX_SUBCHANNELS] = {
[0 ... (__MAX_SUBCHANNELS-1)] = INVALID_STORAGE_AREA
};
static atomic_t sync_isc = ATOMIC_INIT(-1);
static int sync_isc_cnt = 0; // synchronous irq processing lock
static spinlock_t adapter_lock = SPIN_LOCK_UNLOCKED;
// adapter interrupt lock
static psw_t io_sync_wait; // wait PSW for sync IO, prot. by sync_isc
static int cons_dev = -1; // identify console device
static int init_IRQ_complete = 0;
static int cio_show_msg = 0;
static schib_t *p_init_schib = NULL;
static irb_t *p_init_irb = NULL;
static __u64 irq_IPL_TOD;
static adapter_int_handler_t adapter_handler = NULL;
/* for use of debug feature */
debug_info_t *cio_debug_msg_id = NULL;
debug_info_t *cio_debug_trace_id = NULL;
debug_info_t *cio_debug_crw_id = NULL;
int cio_debug_initialized = 0;
static void init_IRQ_handler( int irq, void *dev_id, struct pt_regs *regs);
static void s390_process_subchannels( void);
static void s390_device_recognition_all( void);
static void s390_device_recognition_irq( int irq);
#ifdef CONFIG_PROC_FS
static void s390_redo_validation(void);
#endif
static int s390_validate_subchannel( int irq, int enable);
static int s390_SenseID( int irq, senseid_t *sid, __u8 lpm);
static int s390_SetPGID( int irq, __u8 lpm, pgid_t *pgid);
static int s390_SensePGID( int irq, __u8 lpm, pgid_t *pgid);
static int s390_process_IRQ( unsigned int irq );
static int enable_subchannel( unsigned int irq);
static int disable_subchannel( unsigned int irq);
#ifdef CONFIG_PROC_FS
static int chan_proc_init( void );
#endif
static inline void do_adapter_IO( __u32 intparm );
int s390_DevicePathVerification( int irq, __u8 domask );
int s390_register_adapter_interrupt( adapter_int_handler_t handler );
int s390_unregister_adapter_interrupt( adapter_int_handler_t handler );
extern int do_none(unsigned int irq, int cpu, struct pt_regs * regs);
extern int enable_none(unsigned int irq);
extern int disable_none(unsigned int irq);
asmlinkage void do_IRQ( struct pt_regs regs );
#ifdef CONFIG_PROC_FS
#define MAX_CIO_PROCFS_ENTRIES 0x300
/* magic number; we want to have some room to spare */
int cio_procfs_device_create(int devno);
int cio_procfs_device_remove(int devno);
int cio_procfs_device_purge(void);
#endif
int cio_notoper_msg = 1;
#ifdef CONFIG_PROC_FS
int cio_proc_devinfo = 0; /* switch off the /proc/deviceinfo/ stuff by default
until problems are dealt with */
#endif
unsigned long s390_irq_count[NR_CPUS]; /* trace how many irqs have occured per cpu... */
int cio_count_irqs = 1; /* toggle use here... */
/*
* "Blacklisting" of certain devices:
* Device numbers given in the commandline as cio_ignore=... won't be known to Linux
* These can be single devices or ranges of devices
*
* 10/23/01 reworked to get rid of lists
*/
static unsigned long bl_dev[2048] = {0,};
static spinlock_t blacklist_lock = SPIN_LOCK_UNLOCKED;
static int highest_ignored = 0;
static int nr_ignored = 0;
/*
* Function: blacklist_range_add
* Blacklist the devices from-to
*/
static inline void blacklist_range_add( int from, int to,int locked)
{
unsigned long flags;
int i;
if (to && (from>to)) {
printk(KERN_WARNING "Invalid blacklist range %x to %x, skipping\n", from, to);
return;
}
if(!locked)
spin_lock_irqsave( &blacklist_lock, flags );
if (!to)
to = from;
for (i=from;i<=to;i++) {
set_bit(i,&bl_dev);
nr_ignored++;
}
if (to>=highest_ignored)
highest_ignored = to;
if(!locked)
spin_unlock_irqrestore( &blacklist_lock, flags );
}
/*
* Function: blacklist_range_remove
* Removes a range from the blacklist chain
*/
static inline void blacklist_range_remove( int from, int to )
{
long flags;
int i;
spin_lock_irqsave( &blacklist_lock, flags );
for (i=from;i<=to;i++) {
clear_bit(i,&bl_dev);
nr_ignored--;
}
if (to == highest_ignored)
for (highest_ignored=from;(highest_ignored>0) && (!test_bit(highest_ignored,&bl_dev));highest_ignored--);
spin_unlock_irqrestore( &blacklist_lock, flags );
}
/* Parsing the commandline for blacklist parameters */
/*
* Variable to hold the blacklisted devices given by the parameter line
* cio_ignore=...
*/
char *blacklist[256] = {NULL, };
/*
* Get the cio_ignore=... items from the parameter line
*/
static void blacklist_split_parm_string (char *str)
{
char *tmp = str;
int count = 0;
do {
char *end;
int len;
end = strchr (tmp, ',');
if (end == NULL) {
len = strlen (tmp) + 1;
} else {
len = (long) end - (long) tmp + 1;
*end = '\0';
end++;
}
blacklist[count] = alloc_bootmem (len * sizeof (char) );
if (blacklist == NULL) {
printk (KERN_WARNING "can't store cio_ignore= parameter no %d\n", count + 1);
break;
}
memset (blacklist[count], 0, len * sizeof (char));
memcpy (blacklist[count], tmp, len * sizeof (char));
count++;
tmp = end;
} while (tmp != NULL && *tmp != '\0');
}
/*
* The blacklist parameters as one concatenated string
*/
static char blacklist_parm_string[1024] __initdata = {0,};
/*
* function: blacklist_strtoul
* Strip leading '0x' and interpret the values as Hex
*/
static inline int blacklist_strtoul (char *str, char **stra)
{
char *temp = str;
int val;
if (*temp == '0') {
temp++; /* strip leading zero */
if (*temp == 'x')
temp++; /* strip leading x */
}
val = simple_strtoul (temp, &temp, 16); /* interpret anything as hex */
*stra = temp;
return val;
}
/*
* Function: blacklist_parse
* Parse the parameters given to cio_ignore=...
* Add the blacklisted devices to the blacklist chain
*/
static inline void blacklist_parse( char **str )
{
char *temp;
int from, to;
while (*str) {
temp = *str;
from = 0;
to = 0;
from = blacklist_strtoul( temp, &temp );
if (*temp == '-') {
temp++;
to = blacklist_strtoul( temp, &temp );
}
blacklist_range_add( from, to, 0 );
#ifdef CONFIG_DEBUG_IO
printk( KERN_INFO "Blacklisted range from %X to %X\n", from, to );
#endif
str++;
}
}
/*
* Initialisation of blacklist
*/
void __init blacklist_init( void )
{
#ifdef CONFIG_DEBUG_IO
printk( KERN_DEBUG "Reading blacklist...\n");
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 6,
"Reading blacklist\n");
blacklist_split_parm_string( blacklist_parm_string );
blacklist_parse( blacklist );
}
/*
* Get all the blacklist parameters from parameter line
*/
void __init blacklist_setup (char *str, int *ints)
{
int len = strlen (blacklist_parm_string);
if (len != 0) {
strcat (blacklist_parm_string, ",");
}
strcat (blacklist_parm_string, str);
}
int __init blacklist_call_setup (char *str)
{
int dummy;
#ifdef CONFIG_DEBUG_IO
printk( KERN_DEBUG "Reading blacklist parameters...\n" );
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 6,
"Reading blacklist parameters\n");
blacklist_setup(str,&dummy);
blacklist_init(); /* Blacklist ranges must be ready when device recognition starts */
return 1;
}
__setup ("cio_ignore=", blacklist_call_setup);
/* Checking if devices are blacklisted */
/*
* Function: is_blacklisted
* Returns 1 if the given devicenumber can be found in the blacklist, otherwise 0.
*/
static inline int is_blacklisted( int devno )
{
long flags;
int retval=0;
spin_lock_irqsave( &blacklist_lock, flags );
if (test_bit(devno,&bl_dev))
retval=1;
spin_unlock_irqrestore( &blacklist_lock, flags );
return retval;
}
/*
* Function: blacklist_free_all_ranges
* set all blacklisted devices free...
*/
void blacklist_free_all_ranges(void)
{
unsigned long flags;
int i;
spin_lock_irqsave( &blacklist_lock, flags );
for (i=0;i<=highest_ignored;i++)
clear_bit(i,&bl_dev);
highest_ignored = 0;
nr_ignored = 0;
spin_unlock_irqrestore( &blacklist_lock, flags );
}
#ifdef CONFIG_PROC_FS
/*
* Function: blacklist_parse_proc_parameters
* parse the stuff which is piped to /proc/cio_ignore
*/
void blacklist_parse_proc_parameters(char *buf)
{
char *tmp;
int i;
char *end;
int len = -1;
char *param;
int from = 0;
int to = 0;
long flags;
int err = 0;
tmp = buf;
if (strstr(tmp, "free ")) {
for (i=0; i<5; i++) {
tmp++;
}
if (strstr(tmp, "all")) {
blacklist_free_all_ranges();
s390_redo_validation();
} else {
while (tmp != NULL) {
end = strchr(tmp, ',');
if (end == NULL) {
len = strlen(tmp) + 1;
} else {
len = (long)end - (long) tmp + 1;
*end = '\0';
end++;
}
param = (char*) kmalloc(len * sizeof(char) + 1, GFP_KERNEL);
strncpy(param, (const char *) tmp, len);
tmp = end;
from = blacklist_strtoul(param, ¶m);
if (*param == '-') {
param++;
to = blacklist_strtoul(param, ¶m);
} else {
to = from;
}
blacklist_range_remove( from, to );
kfree(param);
}
s390_redo_validation();
}
} else if (strstr(tmp, "add ")) {
for (i=0;i<4;i++){
tmp++;
}
while (tmp != NULL) {
end = strchr(tmp, ',');
if (end == NULL) {
len = strlen(tmp) + 1;
} else {
len = (long)end - (long) tmp + 1;
*end = '\0';
end++;
}
param = (char*) kmalloc(len * sizeof(char) + 1, GFP_KERNEL);
strncpy(param, (const char *) tmp, len);
tmp = end;
from = blacklist_strtoul(param, ¶m);
if (*param == '-') {
param++;
to = blacklist_strtoul(param, ¶m);
} else {
to = from;
}
spin_lock_irqsave( &blacklist_lock, flags );
/*
* Don't allow for already known devices to be
* blacklisted
* The criterion is a bit dumb, devices which once were
* there but are already gone are also caught...
*/
err = 0;
for (i=0; i<=highest_subchannel; i++) {
if (ioinfo[i]!=INVALID_STORAGE_AREA) {
if ( (ioinfo[i]->schib.pmcw.dev >= from)
&& (ioinfo[i]->schib.pmcw.dev <= to) ) {
printk(KERN_WARNING "cio_ignore: Won't blacklist "
"already known devices, skipping range "
"%x to %x\n", from, to);
err = 1;
break;
}
}
}
if (!err)
blacklist_range_add(from, to, 1);
spin_unlock_irqrestore( &blacklist_lock, flags );
kfree(param);
}
} else {
printk( KERN_WARNING "cio_ignore: Parse error; try using 'free all|<devno-range>,<devno-range>,...'\n");
printk( KERN_WARNING "or 'add <devno-range>,<devno-range>,...'\n");
}
}
#endif
/* End of blacklist handling */
void s390_displayhex(char *str,void *ptr,s32 cnt);
void s390_displayhex2(char *str, void *ptr, s32 cnt, int level);
void s390_displayhex(char *str,void *ptr,s32 cnt)
{
s32 cnt1,cnt2,maxcnt2;
u32 *currptr=(__u32 *)ptr;
printk("\n%s\n",str);
for(cnt1=0;cnt1<cnt;cnt1+=16)
{
printk("%08lX ",(unsigned long)currptr);
maxcnt2=cnt-cnt1;
if(maxcnt2>16)
maxcnt2=16;
for(cnt2=0;cnt2<maxcnt2;cnt2+=4)
printk("%08X ",*currptr++);
printk("\n");
}
}
void s390_displayhex2(char *str, void *ptr, s32 cnt, int level)
{
s32 cnt1, cnt2, maxcnt2;
u32 *currptr = (__u32 *)ptr;
char buffer[cnt*12];
debug_sprintf_event(cio_debug_msg_id, level, "%s\n", str);
for (cnt1 = 0; cnt1<cnt; cnt1+=16) {
sprintf(buffer, "%08lX ", (unsigned long)currptr);
maxcnt2 = cnt - cnt1;
if (maxcnt2 > 16)
maxcnt2 = 16;
for (cnt2 = 0; cnt2 < maxcnt2; cnt2 += 4)
sprintf(buffer, "%08X ", *currptr++);
}
debug_sprintf_event(cio_debug_msg_id, level, "%s\n",buffer);
}
static int __init cio_setup( char *parm )
{
if ( !strcmp( parm, "yes") )
{
cio_show_msg = 1;
}
else if ( !strcmp( parm, "no") )
{
cio_show_msg = 0;
}
else
{
printk( KERN_ERR "cio_setup : invalid cio_msg parameter '%s'", parm);
} /* endif */
return 1;
}
__setup("cio_msg=", cio_setup);
static int __init cio_notoper_setup(char *parm)
{
if (!strcmp(parm, "yes")) {
cio_notoper_msg = 1;
} else if (!strcmp(parm, "no")) {
cio_notoper_msg = 0;
} else {
printk( KERN_ERR "cio_notoper_setup: invalid cio_notoper_msg parameter '%s'", parm);
}
return 1;
}
__setup("cio_notoper_msg=", cio_notoper_setup);
#ifdef CONFIG_PROC_FS
static int __init cio_proc_devinfo_setup(char *parm)
{
if (!strcmp(parm, "yes")) {
cio_proc_devinfo = 1;
} else if (!strcmp(parm, "no")) {
cio_proc_devinfo = 0;
} else {
printk( KERN_ERR "cio_proc_devinfo_setup: invalid parameter '%s'\n",parm);
}
return 1;
}
__setup("cio_proc_devinfo=", cio_proc_devinfo_setup);
#endif
/*
* register for adapter interrupts
*
* With HiperSockets the zSeries architecture provides for
* means of adapter interrups, pseudo I/O interrupts that are
* not tied to an I/O subchannel, but to an adapter. However,
* it doesn't disclose the info how to enable/disable them, but
* to recognize them only. Perhaps we should consider them
* being shared interrupts, and thus build a linked list
* of adapter handlers ... to be evaluated ...
*/
int s390_register_adapter_interrupt( adapter_int_handler_t handler )
{
int ret = 0;
char dbf_txt[15];
if (cio_debug_initialized)
debug_text_event(cio_debug_trace_id, 4, "rgaint");
spin_lock( &adapter_lock );
if ( handler == NULL )
ret = -EINVAL;
else if ( adapter_handler )
ret = -EBUSY;
else
adapter_handler = handler;
spin_unlock( &adapter_lock );
if (cio_debug_initialized) {
sprintf(dbf_txt,"ret:%d",ret);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
return( ret);
}
int s390_unregister_adapter_interrupt( adapter_int_handler_t handler )
{
int ret = 0;
char dbf_txt[15];
if (cio_debug_initialized)
debug_text_event(cio_debug_trace_id, 4, "urgaint");
spin_lock( &adapter_lock );
if ( handler == NULL )
ret = -EINVAL;
else if ( handler != adapter_handler )
ret = -EINVAL;
else
adapter_handler = NULL;
spin_unlock( &adapter_lock );
if (cio_debug_initialized) {
sprintf(dbf_txt,"ret:%d",ret);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
return( ret);
}
static inline void do_adapter_IO( __u32 intparm )
{
if (cio_debug_initialized)
debug_text_event(cio_debug_trace_id, 4, "doaio");
spin_lock( &adapter_lock );
if ( adapter_handler )
(*adapter_handler)( intparm );
spin_unlock( &adapter_lock );
return;
}
/*
* Note : internal use of irqflags SA_PROBE for NOT path grouping
*
*/
int s390_request_irq_special( int irq,
io_handler_func_t io_handler,
not_oper_handler_func_t not_oper_handler,
unsigned long irqflags,
const char *devname,
void *dev_id)
{
int retval = 0;
unsigned long flags;
char dbf_txt[15];
int retry;
if (irq >= __MAX_SUBCHANNELS)
return -EINVAL;
if ( !io_handler || !dev_id )
return -EINVAL;
if ( ioinfo[irq] == INVALID_STORAGE_AREA )
return -ENODEV;
if (cio_debug_initialized) {
sprintf(dbf_txt, "reqsp%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
/*
* The following block of code has to be executed atomically
*/
s390irq_spin_lock_irqsave( irq, flags);
if ( !ioinfo[irq]->ui.flags.ready )
{
retry = 5;
ioinfo[irq]->irq_desc.handler = io_handler;
ioinfo[irq]->irq_desc.name = devname;
ioinfo[irq]->irq_desc.dev_id = dev_id;
ioinfo[irq]->ui.flags.ready = 1;
do {
retval = enable_subchannel(irq);
if (retval) {
ioinfo[irq]->ui.flags.ready = 0;
break;
}
stsch(irq,&ioinfo[irq]->schib);
if (ioinfo[irq]->schib.pmcw.ena)
retry = 0;
else
retry--;
} while (retry);
}
else
{
/*
* interrupt already owned, and shared interrupts
* aren't supported on S/390.
*/
retval = -EBUSY;
} /* endif */
s390irq_spin_unlock_irqrestore(irq,flags);
if ( retval == 0 )
{
if ( !(irqflags & SA_PROBE))
s390_DevicePathVerification( irq, 0 );
ioinfo[irq]->ui.flags.newreq = 1;
ioinfo[irq]->nopfunc = not_oper_handler;
}
if (cio_debug_initialized)
debug_int_event(cio_debug_trace_id, 4, retval);
return retval;
}
int s390_request_irq( unsigned int irq,
void (*handler)(int, void *, struct pt_regs *),
unsigned long irqflags,
const char *devname,
void *dev_id)
{
int ret;
ret = s390_request_irq_special( irq,
(io_handler_func_t)handler,
NULL,
irqflags,
devname,
dev_id);
if ( ret == 0 )
{
ioinfo[irq]->ui.flags.newreq = 0;
} /* endif */
return( ret);
}
void s390_free_irq(unsigned int irq, void *dev_id)
{
unsigned long flags;
int ret;
char dbf_txt[15];
if ( irq >= __MAX_SUBCHANNELS || ioinfo[irq] == INVALID_STORAGE_AREA )
return;
if (cio_debug_initialized) {
sprintf(dbf_txt, "free%x", irq);
debug_text_event(cio_debug_trace_id, 2, dbf_txt);
}
s390irq_spin_lock_irqsave( irq, flags);
#ifdef CONFIG_KERNEL_DEBUG
if ( irq != cons_dev )
printk( KERN_DEBUG "Trying to free IRQ%d\n",irq);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2, "Trying to free IRQ %d\n", irq);
/*
* disable the device and reset all IRQ info if
* the IRQ is actually owned by the handler ...
*/
if ( ioinfo[irq]->ui.flags.ready ) {
if ( dev_id == ioinfo[irq]->irq_desc.dev_id ) {
/* start deregister */
ioinfo[irq]->ui.flags.unready = 1;
/*
* Try to stop IO first...
* ... it seems disable_subchannel is sometimes
* successfully called with IO still pending.
*/
halt_IO( irq,
0xC8C1D3E3,
DOIO_WAIT_FOR_INTERRUPT );
ret = disable_subchannel( irq);
if ( ret == -EBUSY ) {
/*
* kill it !
* ... we first try sync and eventually
* try terminating the current I/O by
* an async request, twice halt, then
* clear.
*/
ret = halt_IO( irq,
0xC8C1D3E3,
DOIO_WAIT_FOR_INTERRUPT );
if ( ret == -EBUSY ) {
halt_IO( irq, 0xC8C1D3E3, 0);
s390irq_spin_unlock_irqrestore( irq, flags);
udelay( 200000 ); /* 200 ms */
s390irq_spin_lock_irqsave( irq, flags);
} /* endif */
ret = disable_subchannel(irq);
if (ret == -EBUSY) {
clear_IO( irq, 0x40C3D3D9,0 );
s390irq_spin_unlock_irqrestore( irq, flags);
udelay( 1000000 ); /* 1000 ms */
s390irq_spin_lock_irqsave( irq, flags);
/* give it a very last try ... */
disable_subchannel( irq);
if ( ioinfo[irq]->ui.flags.busy ) {
printk( KERN_CRIT"free_irq(%04X) "
"- device %04X busy, retry "
"count exceeded\n",
irq,
ioinfo[irq]->devstat.devno);
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 0,
"free_irq(%04X) - device %04X busy, retry count exceeded\n",
irq, ioinfo[irq]->devstat.devno);
} /* endif */
} /* endif */
} /* endif */
ioinfo[irq]->ui.flags.ready = 0;
ioinfo[irq]->ui.flags.unready = 0; /* deregister ended */
ioinfo[irq]->nopfunc = NULL;
s390irq_spin_unlock_irqrestore( irq, flags);
} else {
s390irq_spin_unlock_irqrestore( irq, flags);
printk( KERN_ERR "free_irq(%04X) : error, "
"dev_id does not match !\n", irq);
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 0,
"free_irq(%04X) : error, dev_id does not match !\n", irq);
} /* endif */
} else {
s390irq_spin_unlock_irqrestore( irq, flags);
printk( KERN_ERR "free_irq(%04X) : error, "
"no action block ... !\n", irq);
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 0,
"free_irq(%04X) : error, no action block ... !\n", irq);
} /* endif */
}
/*
* Generic enable/disable code
*/
int disable_irq(unsigned int irq)
{
unsigned long flags;
int ret;
char dbf_txt[15];
SANITY_CHECK(irq);
if ( !ioinfo[irq]->ui.flags.ready )
return -ENODEV;
if (cio_debug_initialized) {
sprintf(dbf_txt, "disirq%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
s390irq_spin_lock_irqsave(irq, flags);
ret = disable_subchannel(irq);
s390irq_spin_unlock_irqrestore(irq, flags);
synchronize_irq();
if (cio_debug_initialized)
debug_int_event(cio_debug_trace_id, 4, ret);
return( ret);
}
int enable_irq(unsigned int irq)
{
unsigned long flags;
int ret;
char dbf_txt[15];
SANITY_CHECK(irq);
if ( !ioinfo[irq]->ui.flags.ready )
return -ENODEV;
if (cio_debug_initialized) {
sprintf(dbf_txt, "enirq%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
s390irq_spin_lock_irqsave(irq, flags);
ret = enable_subchannel(irq);
s390irq_spin_unlock_irqrestore(irq, flags);
if (cio_debug_initialized)
debug_int_event(cio_debug_trace_id, 4, ret);
return(ret);
}
/*
* Enable IRQ by modifying the subchannel
*/
static int enable_subchannel( unsigned int irq)
{
int ret = 0;
int ccode;
int retry = 5;
char dbf_txt[15];
SANITY_CHECK(irq);
if (cio_debug_initialized) {
sprintf(dbf_txt, "ensch%x", irq);
debug_text_event(cio_debug_trace_id, 2, dbf_txt);
}
/*
* If a previous disable request is pending we reset it. However, this
* status implies that the device may (still) be not-operational.
*/
if ( ioinfo[irq]->ui.flags.d_disable )
{
ioinfo[irq]->ui.flags.d_disable = 0;
ret = 0;
}
else
{
ccode = stsch(irq, &(ioinfo[irq]->schib) );
if ( ccode )
{
ret = -ENODEV;
}
else
{
ioinfo[irq]->schib.pmcw.ena = 1;
if ( irq == cons_dev )
{
ioinfo[irq]->schib.pmcw.isc = 7;
}
else
{
ioinfo[irq]->schib.pmcw.isc = 3;
} /* endif */
do
{
ccode = msch( irq, &(ioinfo[irq]->schib) );
switch (ccode) {
case 0: /* ok */
ret = 0;
retry = 0;
break;
case 1: /* status pending */
ioinfo[irq]->ui.flags.s_pend = 1;
s390_process_IRQ( irq );
ioinfo[irq]->ui.flags.s_pend = 0;
ret = -EIO; /* might be overwritten */
/* ... on re-driving */
/* ... the msch() */
retry--;
break;
case 2: /* busy */
udelay(100); /* allow for recovery */
ret = -EBUSY;
retry--;
break;
case 3: /* not oper */
ioinfo[irq]->ui.flags.oper = 0;
retry = 0;
ret = -ENODEV;
break;
}
} while ( retry );
} /* endif */
} /* endif */
if (cio_debug_initialized) {
sprintf(dbf_txt,"ret:%d",ret);
debug_text_event(cio_debug_trace_id, 2, dbf_txt);
}
return( ret );
}
/*
* Disable IRQ by modifying the subchannel
*/
static int disable_subchannel( unsigned int irq)
{
int cc; /* condition code */
int ret = 0; /* function return value */
int retry = 5;
char dbf_txt[15];
SANITY_CHECK(irq);
if ( ioinfo[irq]->ui.flags.busy )
{
/*
* the disable function must not be called while there are
* requests pending for completion !
*/
ret = -EBUSY;
}
else
{
if (cio_debug_initialized) {
sprintf(dbf_txt, "dissch%x", irq);
debug_text_event(cio_debug_trace_id, 2, dbf_txt);
}
/*
* If device isn't operational we have to perform delayed
* disabling when the next interrupt occurs - unless the
* irq is re-requested prior to the interrupt to occur.
*/
cc = stsch(irq, &(ioinfo[irq]->schib) );
if ( cc == 3 )
{
ioinfo[irq]->ui.flags.oper = 0;
ioinfo[irq]->ui.flags.d_disable = 1;
ret = 0;
}
else // cc == 0
{
ioinfo[irq]->schib.pmcw.ena = 0;
do
{
cc = msch( irq, &(ioinfo[irq]->schib) );
switch (cc) {
case 0: /* ok */
retry = 0;
ret = 0;
break;
case 1: /* status pending */
ioinfo[irq]->ui.flags.s_pend = 1;
s390_process_IRQ( irq );
ioinfo[irq]->ui.flags.s_pend = 0;
ret = -EIO; /* might be overwritten */
/* ... on re-driving the */
/* ... msch() call */
retry--;
break;
case 2: /* busy; this should not happen! */
printk( KERN_CRIT"disable_subchannel(%04X) "
"- unexpected busy condition for "
"device %04X received !\n",
irq,
ioinfo[irq]->devstat.devno);
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 0,
"disable_subchannel(%04X) - unexpected busy condition for device %04X received !\n",
irq, ioinfo[irq]->devstat.devno);
retry = 0;
ret = -EBUSY;
break;
case 3: /* not oper */
/*
* should hardly occur ?!
*/
ioinfo[irq]->ui.flags.oper = 0;
ioinfo[irq]->ui.flags.d_disable = 1;
retry = 0;
ret = 0; /* if the device has gone we */
/* ... don't need to disable */
/* ... it anymore ! */
break;
} /* endswitch */
} while ( retry );
} /* endif */
} /* endif */
if (cio_debug_initialized) {
sprintf(dbf_txt, "ret:%d",ret);
debug_text_event(cio_debug_trace_id, 2, dbf_txt);
}
return( ret);
}
void s390_init_IRQ( void )
{
unsigned long flags; /* PSW flags */
long cr6 __attribute__ ((aligned (8)));
asm volatile ("STCK %0" : "=m" (irq_IPL_TOD));
p_init_schib = alloc_bootmem_low( sizeof(schib_t));
p_init_irb = alloc_bootmem_low( sizeof(irb_t));
/*
* As we don't know about the calling environment
* we assure running disabled. Before leaving the
* function we resestablish the old environment.
*
* Note : as we don't need a system wide lock, therefore
* we shouldn't use cli(), but __cli() as this
* affects the current CPU only.
*/
__save_flags(flags);
__cli();
/*
* disable all interrupts
*/
cr6 = 0;
__ctl_load( cr6, 6, 6);
s390_process_subchannels();
if (cio_count_irqs) {
int i;
for (i=0; i<NR_CPUS; i++)
s390_irq_count[i]=0;
}
/*
* enable default I/O-interrupt sublass 3
*/
cr6 = 0x10000000;
__ctl_load( cr6, 6, 6);
s390_device_recognition_all();
init_IRQ_complete = 1;
__restore_flags(flags);
return;
}
/*
* dummy handler, used during init_IRQ() processing for compatibility only
*/
void init_IRQ_handler( int irq, void *dev_id, struct pt_regs *regs)
{
/* this is a dummy handler only ... */
}
int s390_start_IO( int irq, /* IRQ */
ccw1_t *cpa, /* logical channel prog addr */
unsigned long user_intparm, /* interruption parameter */
__u8 lpm, /* logical path mask */
unsigned long flag) /* flags */
{
int ccode;
int ret = 0;
char buffer[80];
char dbf_txt[15];
SANITY_CHECK(irq);
/*
* The flag usage is mutal exclusive ...
*/
if ( (flag & DOIO_EARLY_NOTIFICATION)
&& (flag & DOIO_REPORT_ALL ) )
{
return( -EINVAL );
} /* endif */
if (cio_debug_initialized) {
sprintf(dbf_txt, "stIO%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
/*
* setup ORB
*/
ioinfo[irq]->orb.intparm = (__u32)(long)&ioinfo[irq]->u_intparm;
ioinfo[irq]->orb.fmt = 1;
ioinfo[irq]->orb.pfch = !(flag & DOIO_DENY_PREFETCH);
ioinfo[irq]->orb.spnd = (flag & DOIO_ALLOW_SUSPEND ? TRUE : FALSE);
ioinfo[irq]->orb.ssic = ( (flag & DOIO_ALLOW_SUSPEND )
&& (flag & DOIO_SUPPRESS_INTER) );
if ( flag & DOIO_VALID_LPM )
{
ioinfo[irq]->orb.lpm = lpm;
}
else
{
ioinfo[irq]->orb.lpm = ioinfo[irq]->opm;
} /* endif */
#ifdef CONFIG_ARCH_S390X
/*
* for 64 bit we always support 64 bit IDAWs with 4k page size only
*/
ioinfo[irq]->orb.c64 = 1;
ioinfo[irq]->orb.i2k = 0;
#endif
ioinfo[irq]->orb.cpa = (__u32)virt_to_phys( cpa);
/*
* If sync processing was requested we lock the sync ISC, modify the
* device to present interrupts for this ISC only and switch the
* CPU to handle this ISC + the console ISC exclusively.
*/
if ( flag & DOIO_WAIT_FOR_INTERRUPT )
{
ret = enable_cpu_sync_isc( irq);
if ( ret )
{
return( ret);
}
} /* endif */
if ( flag & DOIO_DONT_CALL_INTHDLR )
{
ioinfo[irq]->ui.flags.repnone = 1;
} /* endif */
/*
* Issue "Start subchannel" and process condition code
*/
ccode = ssch( irq, &(ioinfo[irq]->orb) );
if (cio_debug_initialized) {
sprintf(dbf_txt, "ccode:%d", ccode);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
switch ( ccode ) {
case 0:
if ( !ioinfo[irq]->ui.flags.w4sense )
{
/*
* init the device driver specific devstat irb area
*
* Note : don´t clear saved irb info in case of sense !
*/
memset( &((devstat_t *)ioinfo[irq]->irq_desc.dev_id)->ii.irb,
'\0', sizeof( irb_t) );
} /* endif */
memset( &ioinfo[irq]->devstat.ii.irb,
'\0',
sizeof( irb_t) );
/*
* initialize device status information
*/
ioinfo[irq]->ui.flags.busy = 1;
ioinfo[irq]->ui.flags.doio = 1;
ioinfo[irq]->u_intparm = user_intparm;
ioinfo[irq]->devstat.cstat = 0;
ioinfo[irq]->devstat.dstat = 0;
ioinfo[irq]->devstat.lpum = 0;
ioinfo[irq]->devstat.flag = DEVSTAT_START_FUNCTION;
ioinfo[irq]->devstat.scnt = 0;
ioinfo[irq]->ui.flags.fast = 0;
ioinfo[irq]->ui.flags.repall = 0;
/*
* Check for either early (FAST) notification requests
* or if we are to return all interrupt info.
* Default is to call IRQ handler at secondary status only
*/
if ( flag & DOIO_EARLY_NOTIFICATION )
{
ioinfo[irq]->ui.flags.fast = 1;
}
else if ( flag & DOIO_REPORT_ALL )
{
ioinfo[irq]->ui.flags.repall = 1;
} /* endif */
ioinfo[irq]->ulpm = ioinfo[irq]->orb.lpm;
/*
* If synchronous I/O processing is requested, we have
* to wait for the corresponding interrupt to occur by
* polling the interrupt condition. However, as multiple
* interrupts may be outstanding, we must not just wait
* for the first interrupt, but must poll until ours
* pops up.
*/
if ( flag & DOIO_WAIT_FOR_INTERRUPT )
{
psw_t io_new_psw;
int ccode;
uint64_t time_start;
uint64_t time_curr;
int ready = 0;
int io_sub = -1;
struct _lowcore *lc = NULL;
int do_retry = 1;
/*
* We shouldn't perform a TPI loop, waiting for an
* interrupt to occur, but should load a WAIT PSW
* instead. Otherwise we may keep the channel subsystem
* busy, not able to present the interrupt. When our
* sync. interrupt arrived we reset the I/O old PSW to
* its original value.
*/
memcpy( &io_new_psw, &lc->io_new_psw, sizeof(psw_t));
ccode = iac();
switch (ccode) {
case 0: // primary-space
io_sync_wait.mask = _IO_PSW_MASK
| _PSW_PRIM_SPACE_MODE
| _PSW_IO_WAIT;
break;
case 1: // secondary-space
io_sync_wait.mask = _IO_PSW_MASK
| _PSW_SEC_SPACE_MODE
| _PSW_IO_WAIT;
break;
case 2: // access-register
io_sync_wait.mask = _IO_PSW_MASK
| _PSW_ACC_REG_MODE
| _PSW_IO_WAIT;
break;
case 3: // home-space
io_sync_wait.mask = _IO_PSW_MASK
| _PSW_HOME_SPACE_MODE
| _PSW_IO_WAIT;
break;
default:
panic( "start_IO() : unexpected "
"address-space-control %d\n",
ccode);
break;
} /* endswitch */
io_sync_wait.addr = FIX_PSW(&&io_wakeup);
/*
* Martin didn't like modifying the new PSW, now we take
* a fast exit in do_IRQ() instead
*/
*(__u32 *)__LC_SYNC_IO_WORD = 1;
asm volatile ("STCK %0" : "=m" (time_start));
time_start = time_start >> 32;
do
{
if ( flag & DOIO_TIMEOUT )
{
tpi_info_t tpi_info={0,};
do
{
if ( tpi(&tpi_info) == 1 )
{
io_sub = tpi_info.irq;
break;
}
else
{
udelay(100); /* usecs */
asm volatile ("STCK %0" : "=m" (time_curr));
if ( ((time_curr >> 32) - time_start ) >= 3 )
do_retry = 0;
} /* endif */
} while ( do_retry );
}
else
{
__load_psw( io_sync_wait );
io_wakeup:
io_sub = (__u32)*(__u16 *)__LC_SUBCHANNEL_NR;
} /* endif */
if ( do_retry )
ready = s390_process_IRQ( io_sub );
/*
* surrender when retry count's exceeded ...
*/
} while ( !( ( io_sub == irq )
&& ( ready == 1 ))
&& do_retry );
*(__u32 *)__LC_SYNC_IO_WORD = 0;
if ( !do_retry )
ret = -ETIMEDOUT;
} /* endif */
break;
case 1 : /* status pending */
ioinfo[irq]->devstat.flag = DEVSTAT_START_FUNCTION
| DEVSTAT_STATUS_PENDING;
/*
* initialize the device driver specific devstat irb area
*/
memset( &((devstat_t *) ioinfo[irq]->irq_desc.dev_id)->ii.irb,
'\0', sizeof( irb_t) );
/*
* Let the common interrupt handler process the pending status.
* However, we must avoid calling the user action handler, as
* it won't be prepared to handle a pending status during
* do_IO() processing inline. This also implies that process_IRQ
* must terminate synchronously - especially if device sensing
* is required.
*/
ioinfo[irq]->ui.flags.s_pend = 1;
ioinfo[irq]->ui.flags.busy = 1;
ioinfo[irq]->ui.flags.doio = 1;
s390_process_IRQ( irq );
ioinfo[irq]->ui.flags.s_pend = 0;
ioinfo[irq]->ui.flags.busy = 0;
ioinfo[irq]->ui.flags.doio = 0;
ioinfo[irq]->ui.flags.repall = 0;
ioinfo[irq]->ui.flags.w4final = 0;
ioinfo[irq]->devstat.flag |= DEVSTAT_FINAL_STATUS;
/*
* In multipath mode a condition code 3 implies the last path
* has gone, except we have previously restricted the I/O to
* a particular path. A condition code 1 (0 won't occur)
* results in return code EIO as well as 3 with another path
* than the one used (i.e. path available mask is non-zero).
*/
if ( ioinfo[irq]->devstat.ii.irb.scsw.cc == 3 )
{
if ( flag & DOIO_VALID_LPM )
{
ioinfo[irq]->opm &= ~(ioinfo[irq]->devstat.ii.irb.esw.esw1.lpum);
}
else
{
ioinfo[irq]->opm = 0;
} /* endif */
if ( ioinfo[irq]->opm == 0 )
{
ret = -ENODEV;
ioinfo[irq]->ui.flags.oper = 0;
}
else
{
ret = -EIO;
} /* endif */
ioinfo[irq]->devstat.flag |= DEVSTAT_NOT_OPER;
#ifdef CONFIG_DEBUG_IO
{
stsch(irq, &(ioinfo[irq]->schib) );
sprintf( buffer, "s390_start_IO(%04X) - irb for "
"device %04X, after status pending\n",
irq,
ioinfo[irq]->devstat.devno );
s390_displayhex( buffer,
&(ioinfo[irq]->devstat.ii.irb) ,
sizeof(irb_t));
sprintf( buffer, "s390_start_IO(%04X) - schib for "
"device %04X, after status pending\n",
irq,
ioinfo[irq]->devstat.devno );
s390_displayhex( buffer,
&(ioinfo[irq]->schib) ,
sizeof(schib_t));
if (ioinfo[irq]->devstat.flag & DEVSTAT_FLAG_SENSE_AVAIL)
{
sprintf( buffer, "s390_start_IO(%04X) - sense "
"data for "
"device %04X, after status pending\n",
irq,
ioinfo[irq]->devstat.devno );
s390_displayhex( buffer,
ioinfo[irq]->irq_desc.dev_id->ii.sense.data,
ioinfo[irq]->irq_desc.dev_id->rescnt);
} /* endif */
}
#endif
if (cio_debug_initialized) {
stsch(irq, &(ioinfo[irq]->schib) );
sprintf( buffer, "s390_start_IO(%04X) - irb for "
"device %04X, after status pending\n",
irq,
ioinfo[irq]->devstat.devno );
s390_displayhex2( buffer,
&(ioinfo[irq]->devstat.ii.irb) ,
sizeof(irb_t), 2);
sprintf( buffer, "s390_start_IO(%04X) - schib for "
"device %04X, after status pending\n",
irq,
ioinfo[irq]->devstat.devno );
s390_displayhex2( buffer,
&(ioinfo[irq]->schib) ,
sizeof(schib_t), 2);
if (ioinfo[irq]->devstat.flag & DEVSTAT_FLAG_SENSE_AVAIL) {
sprintf( buffer, "s390_start_IO(%04X) - sense "
"data for "
"device %04X, after status pending\n",
irq,
ioinfo[irq]->devstat.devno );
s390_displayhex2( buffer,
ioinfo[irq]->irq_desc.dev_id->ii.sense.data,
ioinfo[irq]->irq_desc.dev_id->rescnt, 2);
} /* endif */
}
}
else
{
ret = -EIO;
ioinfo[irq]->devstat.flag &= ~DEVSTAT_NOT_OPER;
ioinfo[irq]->ui.flags.oper = 1;
} /* endif */
break;
case 2 : /* busy */
ret = -EBUSY;
break;
default: /* device/path not operational */
if ( flag & DOIO_VALID_LPM )
{
ioinfo[irq]->opm &= ~lpm;
}
else
{
ioinfo[irq]->opm = 0;
} /* endif */
if ( ioinfo[irq]->opm == 0 )
{
ioinfo[irq]->ui.flags.oper = 0;
ioinfo[irq]->devstat.flag |= DEVSTAT_NOT_OPER;
} /* endif */
ret = -ENODEV;
memcpy( ioinfo[irq]->irq_desc.dev_id,
&(ioinfo[irq]->devstat),
sizeof( devstat_t) );
#ifdef CONFIG_DEBUG_IO
stsch(irq, &(ioinfo[irq]->schib) );
sprintf( buffer, "s390_start_IO(%04X) - schib for "
"device %04X, after 'not oper' status\n",
irq,
ioinfo[irq]->devstat.devno );
s390_displayhex( buffer,
&(ioinfo[irq]->schib),
sizeof(schib_t));
#endif
if (cio_debug_initialized) {
stsch(irq, &(ioinfo[irq]->schib) );
sprintf( buffer, "s390_start_IO(%04X) - schib for "
"device %04X, after 'not oper' status\n",
irq,
ioinfo[irq]->devstat.devno );
s390_displayhex2( buffer,
&(ioinfo[irq]->schib),
sizeof(schib_t), 2);
}
break;
} /* endswitch */
if ( flag & DOIO_WAIT_FOR_INTERRUPT)
{
disable_cpu_sync_isc( irq );
} /* endif */
if ( flag & DOIO_DONT_CALL_INTHDLR )
{
ioinfo[irq]->ui.flags.repnone = 0;
} /* endif */
return( ret);
}
int do_IO( int irq, /* IRQ */
ccw1_t *cpa, /* channel program address */
unsigned long user_intparm, /* interruption parameter */
__u8 lpm, /* logical path mask */
unsigned long flag) /* flags : see above */
{
int ret = 0;
char dbf_txt[15];
SANITY_CHECK(irq);
/* handler registered ? or free_irq() in process already ? */
if ( !ioinfo[irq]->ui.flags.ready || ioinfo[irq]->ui.flags.unready )
{
return( -ENODEV );
} /* endif */
if (cio_debug_initialized) {
sprintf(dbf_txt, "doIO%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
/*
* Note: We ignore the device operational status - if not operational,
* the SSCH will lead to an -ENODEV condition ...
*/
if ( !ioinfo[irq]->ui.flags.busy ) /* last I/O completed ? */
{
ret = s390_start_IO( irq, cpa, user_intparm, lpm, flag);
}
else if ( ioinfo[irq]->ui.flags.fast )
{
/*
* If primary status was received and ending status is missing,
* the device driver won't be notified on the ending status
* if early (fast) interrupt notification was requested.
* Therefore we have to queue the next incoming request. If
* halt_IO() is issued while there is a request queued, a HSCH
* needs to be issued and the queued request must be deleted
* but its intparm must be returned (see halt_IO() processing)
*/
if ( ioinfo[irq]->ui.flags.w4final
&& !ioinfo[irq]->ui.flags.doio_q )
{
ioinfo[irq]->qflag = flag;
ioinfo[irq]->qcpa = cpa;
ioinfo[irq]->qintparm = user_intparm;
ioinfo[irq]->qlpm = lpm;
}
else
{
ret = -EBUSY;
} /* endif */
}
else
{
ret = -EBUSY;
} /* endif */
return( ret );
}
/*
* resume suspended I/O operation
*/
int resume_IO( int irq)
{
int ret = 0;
char dbf_txt[15];
SANITY_CHECK(irq);
if (cio_debug_initialized) {
sprintf(dbf_txt, "resIO%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
/*
* We allow for 'resume' requests only for active I/O operations
*/
if ( ioinfo[irq]->ui.flags.busy )
{
int ccode;
ccode = rsch( irq);
if (cio_debug_initialized) {
sprintf(dbf_txt, "ccode:%d",ccode);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
switch (ccode) {
case 0 :
break;
case 1 :
s390_process_IRQ( irq );
ret = -EBUSY;
break;
case 2 :
ret = -EINVAL;
break;
case 3 :
/*
* useless to wait for request completion
* as device is no longer operational !
*/
ioinfo[irq]->ui.flags.oper = 0;
ioinfo[irq]->ui.flags.busy = 0;
ret = -ENODEV;
break;
} /* endswitch */
}
else
{
ret = -ENOTCONN;
} /* endif */
return( ret);
}
/*
* Note: The "intparm" parameter is not used by the halt_IO() function
* itself, as no ORB is built for the HSCH instruction. However,
* it allows the device interrupt handler to associate the upcoming
* interrupt with the halt_IO() request.
*/
int halt_IO( int irq,
unsigned long user_intparm,
unsigned long flag) /* possible DOIO_WAIT_FOR_INTERRUPT */
{
int ret;
int ccode;
char dbf_txt[15];
SANITY_CHECK(irq);
/*
* we only allow for halt_IO if the device has an I/O handler associated
*/
if ( !ioinfo[irq]->ui.flags.ready )
{
ret = -ENODEV;
}
/*
* we ignore the halt_io() request if ending_status was received but
* a SENSE operation is waiting for completion.
*/
else if ( ioinfo[irq]->ui.flags.w4sense )
{
ret = 0;
}
else
{
if (cio_debug_initialized) {
sprintf(dbf_txt, "haltIO%x", irq);
debug_text_event(cio_debug_trace_id, 2, dbf_txt);
}
/*
* If sync processing was requested we lock the sync ISC,
* modify the device to present interrupts for this ISC only
* and switch the CPU to handle this ISC + the console ISC
* exclusively.
*/
if ( flag & DOIO_WAIT_FOR_INTERRUPT )
{
ret = enable_cpu_sync_isc( irq);
if ( ret )
{
return( ret);
} /* endif */
} /* endif */
/*
* Issue "Halt subchannel" and process condition code
*/
ccode = hsch( irq );
if (cio_debug_initialized) {
sprintf(dbf_txt, "ccode:%d",ccode);
debug_text_event(cio_debug_trace_id, 2, dbf_txt);
}
switch ( ccode ) {
case 0:
ioinfo[irq]->ui.flags.haltio = 1;
if ( !ioinfo[irq]->ui.flags.doio )
{
ioinfo[irq]->ui.flags.busy = 1;
ioinfo[irq]->u_intparm = user_intparm;
ioinfo[irq]->devstat.cstat = 0;
ioinfo[irq]->devstat.dstat = 0;
ioinfo[irq]->devstat.lpum = 0;
ioinfo[irq]->devstat.flag = DEVSTAT_HALT_FUNCTION;
ioinfo[irq]->devstat.scnt = 0;
}
else
{
ioinfo[irq]->devstat.flag |= DEVSTAT_HALT_FUNCTION;
} /* endif */
/*
* If synchronous I/O processing is requested, we have
* to wait for the corresponding interrupt to occur by
* polling the interrupt condition. However, as multiple
* interrupts may be outstanding, we must not just wait
* for the first interrupt, but must poll until ours
* pops up.
*/
if ( flag & DOIO_WAIT_FOR_INTERRUPT )
{
int io_sub;
__u32 io_parm;
psw_t io_new_psw;
int ccode;
int ready = 0;
struct _lowcore *lc = NULL;
/*
* We shouldn't perform a TPI loop, waiting for
* an interrupt to occur, but should load a
* WAIT PSW instead. Otherwise we may keep the
* channel subsystem busy, not able to present
* the interrupt. When our sync. interrupt
* arrived we reset the I/O old PSW to its
* original value.
*/
memcpy( &io_new_psw,
&lc->io_new_psw,
sizeof(psw_t));
ccode = iac();
switch (ccode) {
case 0: // primary-space
io_sync_wait.mask = _IO_PSW_MASK
| _PSW_PRIM_SPACE_MODE
| _PSW_IO_WAIT;
break;
case 1: // secondary-space
io_sync_wait.mask = _IO_PSW_MASK
| _PSW_SEC_SPACE_MODE
| _PSW_IO_WAIT;
break;
case 2: // access-register
io_sync_wait.mask = _IO_PSW_MASK
| _PSW_ACC_REG_MODE
| _PSW_IO_WAIT;
break;
case 3: // home-space
io_sync_wait.mask = _IO_PSW_MASK
| _PSW_HOME_SPACE_MODE
| _PSW_IO_WAIT;
break;
default:
panic( "halt_IO() : unexpected "
"address-space-control %d\n",
ccode);
break;
} /* endswitch */
io_sync_wait.addr = FIX_PSW(&&hio_wakeup);
/*
* Martin didn't like modifying the new PSW, now we take
* a fast exit in do_IRQ() instead
*/
*(__u32 *)__LC_SYNC_IO_WORD = 1;
do
{
__load_psw( io_sync_wait );
hio_wakeup:
io_parm = *(__u32 *)__LC_IO_INT_PARM;
io_sub = (__u32)*(__u16 *)__LC_SUBCHANNEL_NR;
ready = s390_process_IRQ( io_sub );
} while ( !((io_sub == irq) && (ready == 1)) );
*(__u32 *)__LC_SYNC_IO_WORD = 0;
} /* endif */
ret = 0;
break;
case 1 : /* status pending */
ioinfo[irq]->devstat.flag |= DEVSTAT_STATUS_PENDING;
/*
* initialize the device driver specific devstat irb area
*/
memset( &ioinfo[irq]->irq_desc.dev_id->ii.irb,
'\0', sizeof( irb_t) );
/*
* Let the common interrupt handler process the pending
* status. However, we must avoid calling the user
* action handler, as it won't be prepared to handle
* a pending status during do_IO() processing inline.
* This also implies that s390_process_IRQ must
* terminate synchronously - especially if device
* sensing is required.
*/
ioinfo[irq]->ui.flags.s_pend = 1;
ioinfo[irq]->ui.flags.busy = 1;
ioinfo[irq]->ui.flags.doio = 1;
s390_process_IRQ( irq );
ioinfo[irq]->ui.flags.s_pend = 0;
ioinfo[irq]->ui.flags.busy = 0;
ioinfo[irq]->ui.flags.doio = 0;
ioinfo[irq]->ui.flags.repall = 0;
ioinfo[irq]->ui.flags.w4final = 0;
ioinfo[irq]->devstat.flag |= DEVSTAT_FINAL_STATUS;
/*
* In multipath mode a condition code 3 implies the last
* path has gone, except we have previously restricted
* the I/O to a particular path. A condition code 1
* (0 won't occur) results in return code EIO as well
* as 3 with another path than the one used (i.e. path available mask is non-zero).
*/
if ( ioinfo[irq]->devstat.ii.irb.scsw.cc == 3 )
{
ret = -ENODEV;
ioinfo[irq]->devstat.flag |= DEVSTAT_NOT_OPER;
ioinfo[irq]->ui.flags.oper = 0;
}
else
{
ret = -EIO;
ioinfo[irq]->devstat.flag &= ~DEVSTAT_NOT_OPER;
ioinfo[irq]->ui.flags.oper = 1;
} /* endif */
break;
case 2 : /* busy */
ret = -EBUSY;
break;
default: /* device not operational */
ret = -ENODEV;
break;
} /* endswitch */
if ( flag & DOIO_WAIT_FOR_INTERRUPT )
{
disable_cpu_sync_isc( irq );
} /* endif */
} /* endif */
return( ret );
}
/*
* Note: The "intparm" parameter is not used by the clear_IO() function
* itself, as no ORB is built for the CSCH instruction. However,
* it allows the device interrupt handler to associate the upcoming
* interrupt with the clear_IO() request.
*/
int clear_IO( int irq,
unsigned long user_intparm,
unsigned long flag) /* possible DOIO_WAIT_FOR_INTERRUPT */
{
int ret = 0;
int ccode;
char dbf_txt[15];
SANITY_CHECK(irq);
if ( ioinfo[irq] == INVALID_STORAGE_AREA )
{
return( -ENODEV);
}
/*
* we only allow for clear_IO if the device has an I/O handler associated
*/
if ( !ioinfo[irq]->ui.flags.ready )
{
ret = -ENODEV;
}
/*
* we ignore the clear_io() request if ending_status was received but
* a SENSE operation is waiting for completion.
*/
else if ( ioinfo[irq]->ui.flags.w4sense )
{
ret = 0;
}
else
{
if (cio_debug_initialized) {
sprintf(dbf_txt, "clearIO%x", irq);
debug_text_event(cio_debug_trace_id, 2, dbf_txt);
}
/*
* If sync processing was requested we lock the sync ISC,
* modify the device to present interrupts for this ISC only
* and switch the CPU to handle this ISC + the console ISC
* exclusively.
*/
if ( flag & DOIO_WAIT_FOR_INTERRUPT )
{
ret = enable_cpu_sync_isc( irq);
if ( ret )
{
return( ret);
} /* endif */
} /* endif */
/*
* Issue "Clear subchannel" and process condition code
*/
ccode = csch( irq );
if (cio_debug_initialized) {
sprintf(dbf_txt, "ccode:%d",ccode);
debug_text_event(cio_debug_trace_id, 2, dbf_txt);
}
switch ( ccode ) {
case 0:
ioinfo[irq]->ui.flags.haltio = 1;
if ( !ioinfo[irq]->ui.flags.doio )
{
ioinfo[irq]->ui.flags.busy = 1;
ioinfo[irq]->u_intparm = user_intparm;
ioinfo[irq]->devstat.cstat = 0;
ioinfo[irq]->devstat.dstat = 0;
ioinfo[irq]->devstat.lpum = 0;
ioinfo[irq]->devstat.flag = DEVSTAT_CLEAR_FUNCTION;
ioinfo[irq]->devstat.scnt = 0;
}
else
{
ioinfo[irq]->devstat.flag |= DEVSTAT_CLEAR_FUNCTION;
} /* endif */
/*
* If synchronous I/O processing is requested, we have
* to wait for the corresponding interrupt to occur by
* polling the interrupt condition. However, as multiple
* interrupts may be outstanding, we must not just wait
* for the first interrupt, but must poll until ours
* pops up.
*/
if ( flag & DOIO_WAIT_FOR_INTERRUPT )
{
int io_sub;
__u32 io_parm;
psw_t io_new_psw;
int ccode;
int ready = 0;
struct _lowcore *lc = NULL;
/*
* We shouldn't perform a TPI loop, waiting for
* an interrupt to occur, but should load a
* WAIT PSW instead. Otherwise we may keep the
* channel subsystem busy, not able to present
* the interrupt. When our sync. interrupt
* arrived we reset the I/O old PSW to its
* original value.
*/
memcpy( &io_new_psw,
&lc->io_new_psw,
sizeof(psw_t));
ccode = iac();
switch (ccode) {
case 0: // primary-space
io_sync_wait.mask = _IO_PSW_MASK
| _PSW_PRIM_SPACE_MODE
| _PSW_IO_WAIT;
break;
case 1: // secondary-space
io_sync_wait.mask = _IO_PSW_MASK
| _PSW_SEC_SPACE_MODE
| _PSW_IO_WAIT;
break;
case 2: // access-register
io_sync_wait.mask = _IO_PSW_MASK
| _PSW_ACC_REG_MODE
| _PSW_IO_WAIT;
break;
case 3: // home-space
io_sync_wait.mask = _IO_PSW_MASK
| _PSW_HOME_SPACE_MODE
| _PSW_IO_WAIT;
break;
default:
panic( "clear_IO() : unexpected "
"address-space-control %d\n",
ccode);
break;
} /* endswitch */
io_sync_wait.addr = FIX_PSW(&&cio_wakeup);
/*
* Martin didn't like modifying the new PSW, now we take
* a fast exit in do_IRQ() instead
*/
*(__u32 *)__LC_SYNC_IO_WORD = 1;
do
{
__load_psw( io_sync_wait );
cio_wakeup:
io_parm = *(__u32 *)__LC_IO_INT_PARM;
io_sub = (__u32)*(__u16 *)__LC_SUBCHANNEL_NR;
ready = s390_process_IRQ( io_sub );
} while ( !((io_sub == irq) && (ready == 1)) );
*(__u32 *)__LC_SYNC_IO_WORD = 0;
} /* endif */
ret = 0;
break;
case 1 : /* no status pending for csh */
BUG();
break;
case 2 : /* no busy for csh*/
BUG();
break;
default: /* device not operational */
ret = -ENODEV;
break;
} /* endswitch */
if ( flag & DOIO_WAIT_FOR_INTERRUPT )
{
disable_cpu_sync_isc( irq );
} /* endif */
} /* endif */
return( ret );
}
/*
* do_IRQ() handles all normal I/O device IRQ's (the special
* SMP cross-CPU interrupts have their own specific
* handlers).
*
*/
asmlinkage void do_IRQ( struct pt_regs regs )
{
/*
* Get interrupt info from lowcore
*/
volatile tpi_info_t *tpi_info = (tpi_info_t*)(__LC_SUBCHANNEL_ID);
int cpu = smp_processor_id();
/*
* take fast exit if CPU is in sync. I/O state
*
* Note: we have to turn off the WAIT bit and re-disable
* interrupts prior to return as this was the initial
* entry condition to synchronous I/O.
*/
if ( *(__u32 *)__LC_SYNC_IO_WORD )
{
regs.psw.mask &= ~(_PSW_WAIT_MASK_BIT | _PSW_IO_MASK_BIT);
return;
} /* endif */
#ifdef CONFIG_FAST_IRQ
do {
#endif /* CONFIG_FAST_IRQ */
/*
* Non I/O-subchannel thin interrupts are processed differently
*/
if ( tpi_info->adapter_IO == 1 &&
tpi_info->int_type == IO_INTERRUPT_TYPE )
{
irq_enter(cpu, -1);
do_adapter_IO( tpi_info->intparm );
irq_exit(cpu, -1);
}
else
{
unsigned int irq = tpi_info->irq;
/*
* fix me !!!
*
* instead of boxing the device, we need to schedule device
* recognition, the interrupt stays pending. We need to
* dynamically allocate an ioinfo structure, etc..
*/
if ( ioinfo[irq] == INVALID_STORAGE_AREA )
{
return; /* this keeps the device boxed ... */
}
irq_enter(cpu, irq);
s390irq_spin_lock( irq );
s390_process_IRQ( irq );
s390irq_spin_unlock( irq );
irq_exit(cpu, irq);
}
#ifdef CONFIG_FAST_IRQ
/*
* Are more interrupts pending?
* If so, the tpi instruction will update the lowcore
* to hold the info for the next interrupt.
*/
} while ( tpi( NULL ) != 0 );
#endif /* CONFIG_FAST_IRQ */
return;
}
/*
* s390_process_IRQ() handles status pending situations and interrupts
*
* Called by : do_IRQ() - for "real" interrupts
* s390_start_IO, halt_IO()
* - status pending cond. after SSCH, or HSCH
* disable_subchannel() - status pending conditions (after MSCH)
*
* Returns: 0 - no ending status received, no further action taken
* 1 - interrupt handler was called with ending status
*/
int s390_process_IRQ( unsigned int irq )
{
int ccode; /* cond code from tsch() operation */
int irb_cc; /* cond code from irb */
int sdevstat; /* struct devstat size to copy */
unsigned int fctl; /* function control */
unsigned int stctl; /* status control */
unsigned int actl; /* activity control */
int issense = 0;
int ending_status = 0;
int allow4handler = 1;
int chnchk = 0;
devstat_t *dp;
devstat_t *udp;
char dbf_txt[15];
char buffer[80];
if (cio_count_irqs) {
int cpu = smp_processor_id();
s390_irq_count[cpu]++;
}
if (cio_debug_initialized) {
sprintf(dbf_txt, "procIRQ%x", irq);
debug_text_event(cio_debug_trace_id, 3, dbf_txt);
}
if ( ioinfo[irq] == INVALID_STORAGE_AREA )
{
/* we can't properly process the interrupt ... */
tsch( irq, p_init_irb );
return( 1 );
} /* endif */
dp = &ioinfo[irq]->devstat;
udp = ioinfo[irq]->irq_desc.dev_id;
/*
* It might be possible that a device was not-oper. at the time
* of free_irq() processing. This means the handler is no longer
* available when the device possibly becomes ready again. In
* this case we perform delayed disable_subchannel() processing.
*/
if ( !ioinfo[irq]->ui.flags.ready )
{
if ( !ioinfo[irq]->ui.flags.d_disable )
{
#ifdef CONFIG_DEBUG_IO
printk( KERN_CRIT"s390_process_IRQ(%04X) "
"- no interrupt handler registered "
"for device %04X !\n",
irq,
ioinfo[irq]->devstat.devno);
#endif /* CONFIG_DEBUG_IO */
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 0,
"s390_process_IRQ(%04X) - no interrupt handler registered for device %04X !\n",
irq, ioinfo[irq]->devstat.devno);
} /* endif */
} /* endif */
/*
* retrieve the i/o interrupt information (irb),
* update the device specific status information
* and possibly call the interrupt handler.
*
* Note 1: At this time we don't process the resulting
* condition code (ccode) from tsch(), although
* we probably should.
*
* Note 2: Here we will have to check for channel
* check conditions and call a channel check
* handler.
*
* Note 3: If a start function was issued, the interruption
* parameter relates to it. If a halt function was
* issued for an idle device, the intparm must not
* be taken from lowcore, but from the devstat area.
*/
ccode = tsch( irq, &(dp->ii.irb) );
if (cio_debug_initialized) {
sprintf(dbf_txt, "ccode:%d", ccode);
debug_text_event(cio_debug_trace_id, 3, dbf_txt);
}
//
// We must only accumulate the status if the device is busy already
//
if ( ioinfo[irq]->ui.flags.busy )
{
dp->dstat |= dp->ii.irb.scsw.dstat;
dp->cstat |= dp->ii.irb.scsw.cstat;
dp->intparm = ioinfo[irq]->u_intparm;
}
else
{
dp->dstat = dp->ii.irb.scsw.dstat;
dp->cstat = dp->ii.irb.scsw.cstat;
dp->flag = 0; // reset status flags
dp->intparm = 0;
} /* endif */
dp->lpum = dp->ii.irb.esw.esw1.lpum;
/*
* reset device-busy bit if no longer set in irb
*/
if ( (dp->dstat & DEV_STAT_BUSY )
&& ((dp->ii.irb.scsw.dstat & DEV_STAT_BUSY) == 0))
{
dp->dstat &= ~DEV_STAT_BUSY;
} /* endif */
/*
* Save residual count and CCW information in case primary and
* secondary status are presented with different interrupts.
*/
if ( dp->ii.irb.scsw.stctl
& ( SCSW_STCTL_PRIM_STATUS | SCSW_STCTL_INTER_STATUS ) ) {
/*
* If the subchannel status shows status pending
* and we received a check condition, the count
* information is not meaningful.
*/
if ( !( (dp->ii.irb.scsw.stctl & SCSW_STCTL_STATUS_PEND)
&& ( dp->ii.irb.scsw.cstat
& ( SCHN_STAT_CHN_DATA_CHK
| SCHN_STAT_CHN_CTRL_CHK
| SCHN_STAT_INTF_CTRL_CHK
| SCHN_STAT_PROG_CHECK
| SCHN_STAT_PROT_CHECK
| SCHN_STAT_CHAIN_CHECK )))) {
dp->rescnt = dp->ii.irb.scsw.count;
} else {
dp->rescnt = SENSE_MAX_COUNT;
}
dp->cpa = dp->ii.irb.scsw.cpa;
#ifdef CONFIG_DEBUG_IO
if ( irq != cons_dev )
printk( KERN_DEBUG "s390_process_IRQ( %04X ) : "
"residual count from irb after tsch() %d\n",
irq, dp->rescnt );
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 6,
"s390_process_IRQ( %04X ) : residual count from irq after tsch() %d\n",
irq, dp->rescnt);
} /* endif */
irb_cc = dp->ii.irb.scsw.cc;
//
// check for any kind of channel or interface control check but don't
// issue the message for the console device
//
if ( (dp->ii.irb.scsw.cstat
& ( SCHN_STAT_CHN_DATA_CHK
| SCHN_STAT_CHN_CTRL_CHK
| SCHN_STAT_INTF_CTRL_CHK )))
{
if (irq != cons_dev)
printk( KERN_WARNING "Channel-Check or Interface-Control-Check "
"received\n"
" ... device %04X on subchannel %04X, dev_stat "
": %02X sch_stat : %02X\n",
ioinfo[irq]->devstat.devno,
irq,
dp->dstat,
dp->cstat);
if (cio_debug_initialized) {
debug_sprintf_event(cio_debug_msg_id, 0,
"Channel-Check or Interface-Control-Check received\n");
debug_sprintf_event(cio_debug_msg_id, 0,
"... device %04X on subchannel %04X, dev_stat: %02X sch_stat: %02X\n",
ioinfo[irq]->devstat.devno, irq, dp->dstat, dp->cstat);
}
chnchk = 1;
} /* endif */
if( dp->ii.irb.scsw.ectl==0)
{
issense=0;
}
else if ( (dp->ii.irb.scsw.stctl == SCSW_STCTL_STATUS_PEND)
&& (dp->ii.irb.scsw.eswf == 0 ))
{
issense = 0;
}
else if ( (dp->ii.irb.scsw.stctl ==
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_INTER_STATUS))
&& ((dp->ii.irb.scsw.actl & SCSW_ACTL_SUSPENDED) == 0) )
{
issense = 0;
}
else
{
issense = dp->ii.irb.esw.esw0.erw.cons;
} /* endif */
if ( issense )
{
dp->scnt = dp->ii.irb.esw.esw0.erw.scnt;
dp->flag |= DEVSTAT_FLAG_SENSE_AVAIL;
sdevstat = sizeof( devstat_t);
#ifdef CONFIG_DEBUG_IO
if ( irq != cons_dev )
printk( KERN_DEBUG "s390_process_IRQ( %04X ) : "
"concurrent sense bytes avail %d\n",
irq, dp->scnt );
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 4,
"s390_process_IRQ( %04X ): concurrent sense bytes avail %d\n",
irq, dp->scnt);
}
else
{
/* don't copy the sense data area ! */
sdevstat = sizeof( devstat_t) - SENSE_MAX_COUNT;
} /* endif */
switch ( irb_cc ) {
case 1: /* status pending */
dp->flag |= DEVSTAT_STATUS_PENDING;
case 0: /* normal i/o interruption */
fctl = dp->ii.irb.scsw.fctl;
stctl = dp->ii.irb.scsw.stctl;
actl = dp->ii.irb.scsw.actl;
if ( chnchk )
{
sprintf( buffer, "s390_process_IRQ(%04X) - irb for "
"device %04X after channel check\n",
irq,
dp->devno );
s390_displayhex( buffer,
&(dp->ii.irb) ,
sizeof(irb_t));
if (cio_debug_initialized) {
sprintf( buffer, "s390_process_IRQ(%04X) - irb for "
"device %04X after channel check\n",
irq,
dp->devno );
s390_displayhex2( buffer,
&(dp->ii.irb) ,
sizeof(irb_t), 0);
}
} /* endif */
ioinfo[irq]->stctl |= stctl;
ending_status = ( stctl & SCSW_STCTL_SEC_STATUS )
|| ( stctl == (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND) )
|| ( stctl == SCSW_STCTL_STATUS_PEND);
/*
* Check for unsolicited interrupts - for debug purposes only
*
* We only consider an interrupt as unsolicited, if the device was not
* actively in use (busy) and an interrupt other than an ALERT status
* was received.
*
* Note: We must not issue a message to the console, if the
* unsolicited interrupt applies to the console device
* itself !
*/
if ( !( stctl & SCSW_STCTL_ALERT_STATUS )
&& ( ioinfo[irq]->ui.flags.busy == 0 ) )
{
#ifdef CONFIG_DEBUG_IO
if (irq != cons_dev)
printk( KERN_INFO "Unsolicited interrupt received for device %04X on subchannel %04X\n"
" ... device status : %02X subchannel status : %02X\n",
dp->devno,
irq,
dp->dstat,
dp->cstat);
sprintf( buffer, "s390_process_IRQ(%04X) - irb for "
"device %04X, ending_status %d\n",
irq,
dp->devno,
ending_status);
s390_displayhex( buffer,
&(dp->ii.irb) ,
sizeof(irb_t));
#endif
if (cio_debug_initialized) {
debug_sprintf_event(cio_debug_msg_id, 2,
"Unsolicited interrupt received for device %04X on subchannel %04X\n"
" ... device status : %02X subchannel status : %02X\n",
dp->devno,
irq,
dp->dstat,
dp->cstat);
sprintf( buffer, "s390_process_IRQ(%04X) - irb for "
"device %04X, ending_status %d\n",
irq,
dp->devno,
ending_status);
s390_displayhex2( buffer,
&(dp->ii.irb) ,
sizeof(irb_t), 2);
}
} /* endif */
/*
* take fast exit if no handler is available
*/
if ( !ioinfo[irq]->ui.flags.ready )
return( ending_status );
/*
* Check whether we must issue a SENSE CCW ourselves if there is no
* concurrent sense facility installed for the subchannel.
*
* Note: We should check for ioinfo[irq]->ui.flags.consns but VM
* violates the ESA/390 architecture and doesn't present an
* operand exception for virtual devices without concurrent
* sense facility available/supported when enabling the
* concurrent sense facility.
*/
if ( ( (dp->ii.irb.scsw.dstat & DEV_STAT_UNIT_CHECK )
&& (!issense ) )
|| (ioinfo[irq]->ui.flags.delsense && ending_status ) )
{
int ret_io;
ccw1_t *s_ccw = &ioinfo[irq]->senseccw;
unsigned long s_flag = 0;
if ( ending_status )
{
/*
* We copy the current status information into the device driver
* status area. Then we can use the local devstat area for device
* sensing. When finally calling the IRQ handler we must not overlay
* the original device status but copy the sense data only.
*/
memcpy( udp, dp, sizeof( devstat_t) );
s_ccw->cmd_code = CCW_CMD_BASIC_SENSE;
s_ccw->cda = (__u32)virt_to_phys( ioinfo[irq]->sense_data );
s_ccw->count = SENSE_MAX_COUNT;
s_ccw->flags = CCW_FLAG_SLI;
/*
* If free_irq() or a sync do_IO/s390_start_IO() is in
* process we have to sense synchronously
*/
if ( ioinfo[irq]->ui.flags.unready || ioinfo[irq]->ui.flags.syncio )
{
s_flag = DOIO_WAIT_FOR_INTERRUPT;
} /* endif */
/*
* Reset status info
*
* It does not matter whether this is a sync. or async.
* SENSE request, but we have to assure we don't call
* the irq handler now, but keep the irq in busy state.
* In sync. mode s390_process_IRQ() is called recursively,
* while in async. mode we re-enter do_IRQ() with the
* next interrupt.
*
* Note : this may be a delayed sense request !
*/
allow4handler = 0;
ioinfo[irq]->ui.flags.fast = 0;
ioinfo[irq]->ui.flags.repall = 0;
ioinfo[irq]->ui.flags.w4final = 0;
ioinfo[irq]->ui.flags.delsense = 0;
dp->cstat = 0;
dp->dstat = 0;
dp->rescnt = SENSE_MAX_COUNT;
ioinfo[irq]->ui.flags.w4sense = 1;
ret_io = s390_start_IO( irq,
s_ccw,
0xE2C5D5E2, // = SENSe
0, // n/a
s_flag);
}
else
{
/*
* we received an Unit Check but we have no final
* status yet, therefore we must delay the SENSE
* processing. However, we must not report this
* intermediate status to the device interrupt
* handler.
*/
ioinfo[irq]->ui.flags.fast = 0;
ioinfo[irq]->ui.flags.repall = 0;
ioinfo[irq]->ui.flags.delsense = 1;
allow4handler = 0;
} /* endif */
} /* endif */
/*
* we allow for the device action handler if .
* - we received ending status
* - the action handler requested to see all interrupts
* - we received an intermediate status
* - fast notification was requested (primary status)
* - unsollicited interrupts
*
*/
if ( allow4handler )
{
allow4handler = ending_status
|| ( ioinfo[irq]->ui.flags.repall )
|| ( stctl & SCSW_STCTL_INTER_STATUS )
|| ( (ioinfo[irq]->ui.flags.fast ) && (stctl & SCSW_STCTL_PRIM_STATUS) )
|| ( ioinfo[irq]->ui.flags.oper == 0 );
} /* endif */
/*
* We used to copy the device status information right before
* calling the device action handler. However, in status
* pending situations during do_IO() or halt_IO(), as well as
* enable_subchannel/disable_subchannel processing we must
* synchronously return the status information and must not
* call the device action handler.
*
*/
if ( allow4handler )
{
/*
* if we were waiting for sense data we copy the sense
* bytes only as the original status information was
* saved prior to sense already.
*/
if ( ioinfo[irq]->ui.flags.w4sense )
{
int sense_count = SENSE_MAX_COUNT-ioinfo[irq]->devstat.rescnt;
#ifdef CONFIG_DEBUG_IO
if ( irq != cons_dev )
printk( KERN_DEBUG "s390_process_IRQ( %04X ) : "
"BASIC SENSE bytes avail %d\n",
irq, sense_count );
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 4,
"s390_process_IRQ( %04X ): BASIC SENSE bytes avail %d\n",
irq, sense_count);
ioinfo[irq]->ui.flags.w4sense = 0;
udp->flag |= DEVSTAT_FLAG_SENSE_AVAIL;
udp->scnt = sense_count;
if ( sense_count >= 0 )
{
memcpy( udp->ii.sense.data,
ioinfo[irq]->sense_data,
sense_count);
}
else
{
panic( "s390_process_IRQ(%04x) encountered "
"negative sense count\n",
irq);
} /* endif */
}
else
{
memcpy( udp, dp, sdevstat );
} /* endif */
} /* endif */
/*
* for status pending situations other than deferred interrupt
* conditions detected by s390_process_IRQ() itself we must not
* call the handler. This will synchronously be reported back
* to the caller instead, e.g. when detected during do_IO().
*/
if ( ioinfo[irq]->ui.flags.s_pend
|| ioinfo[irq]->ui.flags.unready
|| ioinfo[irq]->ui.flags.repnone )
{
if ( ending_status )
{
ioinfo[irq]->ui.flags.busy = 0;
ioinfo[irq]->ui.flags.doio = 0;
ioinfo[irq]->ui.flags.haltio = 0;
ioinfo[irq]->ui.flags.fast = 0;
ioinfo[irq]->ui.flags.repall = 0;
ioinfo[irq]->ui.flags.w4final = 0;
dp->flag |= DEVSTAT_FINAL_STATUS;
udp->flag |= DEVSTAT_FINAL_STATUS;
} /* endif */
allow4handler = 0;
} /* endif */
/*
* Call device action handler if applicable
*/
if ( allow4handler )
{
/*
* We only reset the busy condition when we are sure that no further
* interrupt is pending for the current I/O request (ending_status).
*/
if ( ending_status || !ioinfo[irq]->ui.flags.oper )
{
ioinfo[irq]->ui.flags.oper = 1; /* dev IS oper */
ioinfo[irq]->ui.flags.busy = 0;
ioinfo[irq]->ui.flags.doio = 0;
ioinfo[irq]->ui.flags.haltio = 0;
ioinfo[irq]->ui.flags.fast = 0;
ioinfo[irq]->ui.flags.repall = 0;
ioinfo[irq]->ui.flags.w4final = 0;
dp->flag |= DEVSTAT_FINAL_STATUS;
udp->flag |= DEVSTAT_FINAL_STATUS;
ioinfo[irq]->irq_desc.handler( irq, udp, NULL );
//
// reset intparm after final status or we will badly present unsolicited
// interrupts with a intparm value possibly no longer valid.
//
dp->intparm = 0;
//
// Was there anything queued ? Start the pending channel program
// if there is one.
//
if ( ioinfo[irq]->ui.flags.doio_q )
{
int ret;
ret = s390_start_IO( irq,
ioinfo[irq]->qcpa,
ioinfo[irq]->qintparm,
ioinfo[irq]->qlpm,
ioinfo[irq]->qflag);
ioinfo[irq]->ui.flags.doio_q = 0;
/*
* If s390_start_IO() failed call the device's interrupt
* handler, the IRQ related devstat area was setup by
* s390_start_IO() accordingly already (status pending
* condition).
*/
if ( ret )
{
ioinfo[irq]->irq_desc.handler( irq, udp, NULL );
} /* endif */
} /* endif */
}
else
{
ioinfo[irq]->ui.flags.w4final = 1;
/*
* Eventually reset subchannel PCI status and
* set the PCI or SUSPENDED flag in the user
* device status block if appropriate.
*/
if ( dp->cstat & SCHN_STAT_PCI )
{
udp->flag |= DEVSTAT_PCI;
dp->cstat &= ~SCHN_STAT_PCI;
}
if ( actl & SCSW_ACTL_SUSPENDED )
{
udp->flag |= DEVSTAT_SUSPENDED;
} /* endif */
ioinfo[irq]->irq_desc.handler( irq, udp, NULL );
} /* endif */
} /* endif */
break;
case 3: /* device/path not operational */
ioinfo[irq]->ui.flags.busy = 0;
ioinfo[irq]->ui.flags.doio = 0;
ioinfo[irq]->ui.flags.haltio = 0;
dp->cstat = 0;
dp->dstat = 0;
if ( ioinfo[irq]->ulpm != ioinfo[irq]->opm )
{
/*
* either it was the only path or it was restricted ...
*/
ioinfo[irq]->opm &= ~(ioinfo[irq]->devstat.ii.irb.esw.esw1.lpum);
}
else
{
ioinfo[irq]->opm = 0;
} /* endif */
if ( ioinfo[irq]->opm == 0 )
{
ioinfo[irq]->ui.flags.oper = 0;
} /* endif */
ioinfo[irq]->devstat.flag |= DEVSTAT_NOT_OPER;
ioinfo[irq]->devstat.flag |= DEVSTAT_FINAL_STATUS;
/*
* When we find a device "not oper" we save the status
* information into the device status area and call the
* device specific interrupt handler.
*
* Note: currently we don't have any way to reenable
* the device unless an unsolicited interrupt
* is presented. We don't check for spurious
* interrupts on "not oper" conditions.
*/
if ( ( ioinfo[irq]->ui.flags.fast )
&& ( ioinfo[irq]->ui.flags.w4final ) )
{
/*
* If a new request was queued already, we have
* to simulate the "not oper" status for the
* queued request by switching the "intparm" value
* and notify the interrupt handler.
*/
if ( ioinfo[irq]->ui.flags.doio_q )
{
ioinfo[irq]->devstat.intparm = ioinfo[irq]->qintparm;
} /* endif */
} /* endif */
ioinfo[irq]->ui.flags.fast = 0;
ioinfo[irq]->ui.flags.repall = 0;
ioinfo[irq]->ui.flags.w4final = 0;
/*
* take fast exit if no handler is available
*/
if ( !ioinfo[irq]->ui.flags.ready )
return( ending_status );
memcpy( udp, &(ioinfo[irq]->devstat), sdevstat );
ioinfo[irq]->devstat.intparm = 0;
if ( !ioinfo[irq]->ui.flags.s_pend )
{
ioinfo[irq]->irq_desc.handler( irq, udp, NULL );
} /* endif */
ending_status = 1;
break;
} /* endswitch */
return( ending_status );
}
/*
* Set the special i/o-interruption sublass 7 for the
* device specified by parameter irq. There can only
* be a single device been operated on this special
* isc. This function is aimed being able to check
* on special device interrupts in disabled state,
* without having to delay I/O processing (by queueing)
* for non-console devices.
*
* Setting of this isc is done by set_cons_dev(), while
* reset_cons_dev() resets this isc and re-enables the
* default isc3 for this device. wait_cons_dev() allows
* to actively wait on an interrupt for this device in
* disabed state. When the interrupt condition is
* encountered, wait_cons_dev(9 calls do_IRQ() to have
* the console device driver processing the interrupt.
*/
int set_cons_dev( int irq )
{
int ccode;
unsigned long cr6 __attribute__ ((aligned (8)));
int rc = 0;
char dbf_txt[15];
SANITY_CHECK(irq);
if ( cons_dev != -1 )
{
rc = -EBUSY;
}
else
{
if (cio_debug_initialized) {
sprintf(dbf_txt, "scons%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
/*
* modify the indicated console device to operate
* on special console interrupt sublass 7
*/
ccode = stsch( irq, &(ioinfo[irq]->schib) );
if (ccode)
{
rc = -ENODEV;
ioinfo[irq]->devstat.flag |= DEVSTAT_NOT_OPER;
}
else
{
ioinfo[irq]->schib.pmcw.isc = 7;
ccode = msch( irq, &(ioinfo[irq]->schib) );
if (ccode)
{
rc = -EIO;
}
else
{
cons_dev = irq;
/*
* enable console I/O-interrupt sublass 7
*/
__ctl_store( cr6, 6, 6);
cr6 |= 0x01000000;
__ctl_load( cr6, 6, 6);
} /* endif */
} /* endif */
} /* endif */
return( rc);
}
int reset_cons_dev( int irq)
{
int rc = 0;
int ccode;
long cr6 __attribute__ ((aligned (8)));
char dbf_txt[15];
SANITY_CHECK(irq);
if ( cons_dev != -1 )
{
rc = -EBUSY;
}
else
{
if (cio_debug_initialized) {
sprintf(dbf_txt, "rcons%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
/*
* reset the indicated console device to operate
* on default console interrupt sublass 3
*/
ccode = stsch( irq, &(ioinfo[irq]->schib) );
if (ccode)
{
rc = -ENODEV;
ioinfo[irq]->devstat.flag |= DEVSTAT_NOT_OPER;
}
else
{
ioinfo[irq]->schib.pmcw.isc = 3;
ccode = msch( irq, &(ioinfo[irq]->schib) );
if (ccode)
{
rc = -EIO;
}
else
{
cons_dev = -1;
/*
* disable special console I/O-interrupt sublass 7
*/
__ctl_store( cr6, 6, 6);
cr6 &= 0xFEFFFFFF;
__ctl_load( cr6, 6, 6);
} /* endif */
} /* endif */
} /* endif */
return( rc);
}
int wait_cons_dev( int irq )
{
int rc = 0;
long save_cr6;
char dbf_txt[15];
if ( irq == cons_dev )
{
if (cio_debug_initialized) {
sprintf(dbf_txt, "wcons%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
/*
* before entering the spinlock we may already have
* processed the interrupt on a different CPU ...
*/
if ( ioinfo[irq]->ui.flags.busy == 1 )
{
long cr6 __attribute__ ((aligned (8)));
/*
* disable all, but isc 7 (console device)
*/
__ctl_store( cr6, 6, 6);
save_cr6 = cr6;
cr6 &= 0x01FFFFFF;
__ctl_load( cr6, 6, 6);
do {
tpi_info_t tpi_info = {0,};
if (tpi(&tpi_info) == 1) {
s390_process_IRQ( tpi_info.irq );
} else {
s390irq_spin_unlock(irq);
udelay(100);
s390irq_spin_lock(irq);
}
eieio();
} while (ioinfo[irq]->ui.flags.busy == 1);
/*
* restore previous isc value
*/
cr6 = save_cr6;
__ctl_load( cr6, 6, 6);
} /* endif */
}
else
{
rc = EINVAL;
} /* endif */
return(rc);
}
int enable_cpu_sync_isc( int irq )
{
int ccode;
long cr6 __attribute__ ((aligned (8)));
int retry = 3;
int rc = 0;
char dbf_txt[15];
if (cio_debug_initialized) {
sprintf(dbf_txt, "enisc%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
/* This one spins until it can get the sync_isc lock for irq# irq */
if ( irq <= highest_subchannel && ioinfo[irq] != INVALID_STORAGE_AREA )
{
if ( atomic_read( &sync_isc ) != irq )
atomic_compare_and_swap_spin( -1, irq, &sync_isc );
sync_isc_cnt++;
if ( sync_isc_cnt > 255 ) /* fixme : magic number */
{
panic("Too many recursive calls to enable_sync_isc");
}
/*
* we only run the STSCH/MSCH path for the first enablement
*/
else if ( sync_isc_cnt == 1 )
{
ioinfo[irq]->ui.flags.syncio = 1;
ccode = stsch( irq, &(ioinfo[irq]->schib) );
if ( !ccode )
{
ioinfo[irq]->schib.pmcw.isc = 5;
do
{
ccode = msch( irq,
&(ioinfo[irq]->schib) );
switch (ccode) {
case 0:
/*
* enable special isc
*/
__ctl_store( cr6, 6, 6);
cr6 |= 0x04000000; // enable sync isc 5
cr6 &= 0xEFFFFFFF; // disable standard isc 3
__ctl_load( cr6, 6, 6);
retry = 0;
break;
case 1:
//
// process pending status
//
ioinfo[irq]->ui.flags.s_pend = 1;
s390_process_IRQ( irq );
ioinfo[irq]->ui.flags.s_pend = 0;
rc = -EIO; /* might be overwritten... */
retry--;
break;
case 2: /* busy */
retry = 0;
rc = -EBUSY;
break;
case 3: /* not oper*/
retry = 0;
rc = -ENODEV;
break;
}
} while ( retry );
}
else
{
rc = -ENODEV; // device is not-operational
} /* endif */
} /* endif */
if ( rc ) /* can only happen if stsch/msch fails */
{
sync_isc_cnt = 0;
atomic_set( &sync_isc, -1);
}
}
else
{
#ifdef CONFIG_SYNC_ISC_PARANOIA
panic( "enable_sync_isc: called with invalid %x\n", irq );
#endif
rc = -EINVAL;
} /* endif */
return( rc);
}
int disable_cpu_sync_isc( int irq)
{
int rc = 0;
int retry1 = 5;
int retry2 = 5;
int clear_pend = 0;
int ccode;
long cr6 __attribute__ ((aligned (8)));
char dbf_txt[15];
if (cio_debug_initialized) {
sprintf(dbf_txt, "disisc%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
if ( irq <= highest_subchannel && ioinfo[irq] != INVALID_STORAGE_AREA )
{
/*
* We disable if we're the top user only, as we may
* run recursively ...
* We must not decrease the count immediately; during
* msch() processing we may face another pending
* status we have to process recursively (sync).
*/
#ifdef CONFIG_SYNC_ISC_PARANOIA
if ( atomic_read( &sync_isc ) != irq )
panic( "disable_sync_isc: called for %x while %x locked\n",
irq, atomic_read( &sync_isc ) );
#endif
if ( sync_isc_cnt == 1 )
{
ccode = stsch( irq, &(ioinfo[irq]->schib) );
ioinfo[irq]->schib.pmcw.isc = 3;
do
{
retry2 = 5;
do
{
ccode = msch( irq, &(ioinfo[irq]->schib) );
switch ( ccode ) {
case 0:
/*
* disable special interrupt subclass in CPU
*/
__ctl_store( cr6, 6, 6);
cr6 &= 0xFBFFFFFF; // disable sync isc 5
cr6 |= 0x10000000; // enable standard isc 3
__ctl_load( cr6, 6, 6);
retry2 = 0;
break;
case 1: /* status pending */
ioinfo[irq]->ui.flags.s_pend = 1;
s390_process_IRQ( irq );
ioinfo[irq]->ui.flags.s_pend = 0;
retry2--;
break;
case 2: /* busy */
retry2--;
udelay( 100); // give it time
break;
default: /* not oper */
retry2 = 0;
break;
} /* endswitch */
} while ( retry2 );
retry1--;
/* try stopping it ... */
if ( (ccode) && !clear_pend )
{
clear_IO( irq, 0x00004711, 0 );
clear_pend = 1;
} /* endif */
udelay( 100);
} while ( retry1 && ccode );
ioinfo[irq]->ui.flags.syncio = 0;
sync_isc_cnt = 0;
atomic_set( &sync_isc, -1);
}
else
{
sync_isc_cnt--;
} /* endif */
}
else
{
#ifdef CONFIG_SYNC_ISC_PARANOIA
if ( atomic_read( &sync_isc ) != -1 )
panic( "disable_sync_isc: called with invalid %x while %x locked\n",
irq, atomic_read( &sync_isc ) );
#endif
rc = -EINVAL;
} /* endif */
return( rc);
}
//
// Input :
// devno - device number
// ps - pointer to sense ID data area
//
// Output : none
//
void VM_virtual_device_info( __u16 devno,
senseid_t *ps )
{
diag210_t *p_diag_data;
int ccode;
int error = 0;
if (cio_debug_initialized)
debug_text_event(cio_debug_trace_id, 4, "VMvdinf");
if ( init_IRQ_complete )
{
p_diag_data = kmalloc( sizeof( diag210_t), GFP_DMA );
}
else
{
p_diag_data = alloc_bootmem_low( sizeof( diag210_t));
} /* endif */
p_diag_data->vrdcdvno = devno;
p_diag_data->vrdclen = sizeof( diag210_t);
ccode = diag210( (diag210_t *)virt_to_phys( p_diag_data ) );
ps->reserved = 0xff;
switch (p_diag_data->vrdcvcla) {
case 0x80:
switch (p_diag_data->vrdcvtyp) {
case 00:
ps->cu_type = 0x3215;
break;
default:
error = 1;
break;
} /* endswitch */
break;
case 0x40:
switch (p_diag_data->vrdcvtyp) {
case 0xC0:
ps->cu_type = 0x5080;
break;
case 0x80:
ps->cu_type = 0x2250;
break;
case 0x04:
ps->cu_type = 0x3277;
break;
case 0x01:
ps->cu_type = 0x3278;
break;
default:
error = 1;
break;
} /* endswitch */
break;
case 0x20:
switch (p_diag_data->vrdcvtyp) {
case 0x84:
ps->cu_type = 0x3505;
break;
case 0x82:
ps->cu_type = 0x2540;
break;
case 0x81:
ps->cu_type = 0x2501;
break;
default:
error = 1;
break;
} /* endswitch */
break;
case 0x10:
switch (p_diag_data->vrdcvtyp) {
case 0x84:
ps->cu_type = 0x3525;
break;
case 0x82:
ps->cu_type = 0x2540;
break;
case 0x4F:
case 0x4E:
case 0x48:
ps->cu_type = 0x3820;
break;
case 0x4D:
case 0x49:
case 0x45:
ps->cu_type = 0x3800;
break;
case 0x4B:
ps->cu_type = 0x4248;
break;
case 0x4A:
ps->cu_type = 0x4245;
break;
case 0x47:
ps->cu_type = 0x3262;
break;
case 0x43:
ps->cu_type = 0x3203;
break;
case 0x42:
ps->cu_type = 0x3211;
break;
case 0x41:
ps->cu_type = 0x1403;
break;
default:
error = 1;
break;
} /* endswitch */
break;
case 0x08:
switch (p_diag_data->vrdcvtyp) {
case 0x82:
ps->cu_type = 0x3422;
break;
case 0x81:
ps->cu_type = 0x3490;
break;
case 0x10:
ps->cu_type = 0x3420;
break;
case 0x02:
ps->cu_type = 0x3430;
break;
case 0x01:
ps->cu_type = 0x3480;
break;
case 0x42:
ps->cu_type = 0x3424;
break;
case 0x44:
ps->cu_type = 0x9348;
break;
default:
error = 1;
break;
} /* endswitch */
break;
case 02: /* special device class ... */
switch (p_diag_data->vrdcvtyp) {
case 0x20: /* OSA */
ps->cu_type = 0x3088;
ps->cu_model = 0x60;
break;
default:
error = 1;
break;
} /* endswitch */
break;
default:
error = 1;
break;
} /* endswitch */
if ( init_IRQ_complete )
{
kfree( p_diag_data );
}
else
{
free_bootmem( (unsigned long)p_diag_data, sizeof( diag210_t) );
} /* endif */
if ( error )
{
printk( KERN_ERR "DIAG X'210' for "
"device %04X returned "
"(cc = %d): vdev class : %02X, "
"vdev type : %04X \n ... rdev class : %02X, rdev type : %04X, rdev model: %02X\n",
devno,
ccode,
p_diag_data->vrdcvcla,
p_diag_data->vrdcvtyp,
p_diag_data->vrdcrccl,
p_diag_data->vrdccrty,
p_diag_data->vrdccrmd );
if (cio_debug_initialized)
debug_sprintf_event( cio_debug_msg_id, 0,
"DIAG X'210' for "
"device %04X returned "
"(cc = %d): vdev class : %02X, "
"vdev type : %04X \n ... rdev class : %02X, rdev type : %04X, rdev model: %02X\n",
devno,
ccode,
p_diag_data->vrdcvcla,
p_diag_data->vrdcvtyp,
p_diag_data->vrdcrccl,
p_diag_data->vrdccrty,
p_diag_data->vrdccrmd );
} /* endif */
}
/*
* This routine returns the characteristics for the device
* specified. Some old devices might not provide the necessary
* command code information during SenseID processing. In this
* case the function returns -EINVAL. Otherwise the function
* allocates a decice specific data buffer and provides the
* device characteristics together with the buffer size. Its
* the callers responability to release the kernel memory if
* not longer needed. In case of persistent I/O problems -EBUSY
* is returned.
*
* The function may be called enabled or disabled. However, the
* caller must have locked the irq it is requesting data for.
*
* Note : It would have been nice to collect this information
* during init_IRQ() processing but this is not possible
*
* a) without statically pre-allocation fixed size buffers
* as virtual memory management isn't available yet.
*
* b) without unnecessarily increase system startup by
* evaluating devices eventually not used at all.
*/
int read_dev_chars( int irq, void **buffer, int length )
{
unsigned int flags;
ccw1_t *rdc_ccw;
devstat_t devstat;
char *rdc_buf;
int devflag = 0;
int ret = 0;
int emulated = 0;
int retry = 5;
char dbf_txt[15];
if ( !buffer || !length )
{
return( -EINVAL );
} /* endif */
SANITY_CHECK(irq);
if ( ioinfo[irq]->ui.flags.oper == 0 )
{
return( -ENODEV );
} /* endif */
if (cio_debug_initialized) {
sprintf(dbf_txt, "rddevch%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
/*
* Before playing around with irq locks we should assure
* running disabled on (just) our CPU. Sync. I/O requests
* also require to run disabled.
*
* Note : as no global lock is required, we must not use
* cli(), but __cli() instead.
*/
__save_flags(flags);
__cli();
rdc_ccw = &ioinfo[irq]->senseccw;
if ( !ioinfo[irq]->ui.flags.ready )
{
ret = request_irq( irq,
init_IRQ_handler,
SA_PROBE, "RDC", &devstat );
if ( !ret )
{
emulated = 1;
} /* endif */
} /* endif */
if ( !ret )
{
if ( ! *buffer )
{
rdc_buf = kmalloc( length, GFP_KERNEL);
}
else
{
rdc_buf = *buffer;
} /* endif */
if ( !rdc_buf )
{
ret = -ENOMEM;
}
else
{
do
{
rdc_ccw->cmd_code = CCW_CMD_RDC;
rdc_ccw->count = length;
rdc_ccw->flags = CCW_FLAG_SLI;
ret = set_normalized_cda( rdc_ccw, (unsigned long)rdc_buf );
if (!ret) {
memset( ioinfo[irq]->irq_desc.dev_id,
'\0',
sizeof( devstat_t));
ret = s390_start_IO( irq,
rdc_ccw,
0x00524443, // RDC
0, // n/a
DOIO_WAIT_FOR_INTERRUPT
| DOIO_DONT_CALL_INTHDLR );
retry--;
devflag = ioinfo[irq]->irq_desc.dev_id->flag;
clear_normalized_cda( rdc_ccw);
} else {
udelay(100); //wait for recovery
retry--;
}
} while ( ( retry )
&& ( ret || (devflag & DEVSTAT_STATUS_PENDING) ) );
} /* endif */
if ( !retry )
{
ret = (ret==-ENOMEM)?-ENOMEM:-EBUSY;
} /* endif */
__restore_flags(flags);
/*
* on success we update the user input parms
*/
if ( !ret )
{
*buffer = rdc_buf;
} /* endif */
if ( emulated )
{
free_irq( irq, &devstat);
} /* endif */
} /* endif */
return( ret );
}
/*
* Read Configuration data
*/
int read_conf_data( int irq, void **buffer, int *length, __u8 lpm )
{
unsigned long flags;
int ciw_cnt;
int found = 0; // RCD CIW found
int ret = 0; // return code
char dbf_txt[15];
SANITY_CHECK(irq);
if ( !buffer || !length )
{
return( -EINVAL);
}
else if ( ioinfo[irq]->ui.flags.oper == 0 )
{
return( -ENODEV );
}
else if ( ioinfo[irq]->ui.flags.esid == 0 )
{
return( -EOPNOTSUPP );
} /* endif */
if (cio_debug_initialized) {
sprintf(dbf_txt, "rdconf%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
/*
* scan for RCD command in extended SenseID data
*/
for ( ciw_cnt = 0; (found == 0) && (ciw_cnt < 62); ciw_cnt++ )
{
if ( ioinfo[irq]->senseid.ciw[ciw_cnt].ct == CIW_TYPE_RCD )
{
/*
* paranoia check ...
*/
if ( ioinfo[irq]->senseid.ciw[ciw_cnt].cmd != 0 )
{
found = 1;
} /* endif */
break;
} /* endif */
} /* endfor */
if ( found )
{
devstat_t devstat; /* inline device status area */
devstat_t *pdevstat;
int ioflags;
ccw1_t *rcd_ccw = &ioinfo[irq]->senseccw;
char *rcd_buf = NULL;
int emulated = 0; /* no i/O handler installed */
int retry = 5; /* retry count */
__save_flags(flags);
__cli();
if ( !ioinfo[irq]->ui.flags.ready )
{
pdevstat = &devstat;
ret = request_irq( irq,
init_IRQ_handler,
SA_PROBE, "RCD", pdevstat );
if ( !ret )
{
emulated = 1;
} /* endif */
}
else
{
pdevstat = ioinfo[irq]->irq_desc.dev_id;
} /* endif */
if ( !ret )
{
if ( init_IRQ_complete )
{
rcd_buf = kmalloc( ioinfo[irq]->senseid.ciw[ciw_cnt].count,
GFP_DMA);
}
else
{
rcd_buf = alloc_bootmem_low( ioinfo[irq]->senseid.ciw[ciw_cnt].count);
} /* endif */
if ( rcd_buf == NULL )
{
ret = -ENOMEM;
} /* endif */
if ( !ret )
{
memset( rcd_buf,
'\0',
ioinfo[irq]->senseid.ciw[ciw_cnt].count);
do
{
rcd_ccw->cmd_code = ioinfo[irq]->senseid.ciw[ciw_cnt].cmd;
rcd_ccw->cda = (__u32)virt_to_phys( rcd_buf );
rcd_ccw->count = ioinfo[irq]->senseid.ciw[ciw_cnt].count;
rcd_ccw->flags = CCW_FLAG_SLI;
memset( pdevstat, '\0', sizeof( devstat_t));
if ( lpm )
{
ioflags = DOIO_WAIT_FOR_INTERRUPT
| DOIO_VALID_LPM
| DOIO_DONT_CALL_INTHDLR;
}
else
{
ioflags = DOIO_WAIT_FOR_INTERRUPT
| DOIO_DONT_CALL_INTHDLR;
} /* endif */
ret = s390_start_IO( irq,
rcd_ccw,
0x00524344, // == RCD
lpm,
ioflags );
switch ( ret ) {
case 0:
case -EIO:
if ( !(pdevstat->flag & ( DEVSTAT_STATUS_PENDING
| DEVSTAT_NOT_OPER
| DEVSTAT_FLAG_SENSE_AVAIL ) ) )
{
retry = 0; // we got it ...
}
else
{
retry--; // try again ...
} /* endif */
break;
default: // -EBUSY, -ENODEV, ???
retry = 0;
} /* endswitch */
} while ( retry );
} /* endif */
__restore_flags( flags );
} /* endif */
/*
* on success we update the user input parms
*/
if ( ret == 0 )
{
*length = ioinfo[irq]->senseid.ciw[ciw_cnt].count;
*buffer = rcd_buf;
}
else
{
if ( rcd_buf != NULL )
{
if ( init_IRQ_complete )
{
kfree( rcd_buf );
}
else
{
free_bootmem( (unsigned long)rcd_buf,
ioinfo[irq]->senseid.ciw[ciw_cnt].count);
} /* endif */
} /* endif */
*buffer = NULL;
*length = 0;
} /* endif */
if ( emulated )
free_irq( irq, pdevstat);
}
else
{
ret = -EOPNOTSUPP;
} /* endif */
return( ret );
}
int get_dev_info( int irq, s390_dev_info_t * pdi)
{
return( get_dev_info_by_irq( irq, pdi));
}
static int __inline__ get_next_available_irq( ioinfo_t *pi)
{
int ret_val = -ENODEV;
while ( pi!=NULL ) {
if ( pi->ui.flags.oper ) {
ret_val = pi->irq;
break;
} else {
pi = pi->next;
}
}
return ret_val;
}
int get_irq_first( void )
{
int ret_irq;
if ( ioinfo_head )
{
if ( ioinfo_head->ui.flags.oper )
{
ret_irq = ioinfo_head->irq;
}
else if ( ioinfo_head->next )
{
ret_irq = get_next_available_irq( ioinfo_head->next );
}
else
{
ret_irq = -ENODEV;
} /* endif */
}
else
{
ret_irq = -ENODEV;
} /* endif */
return ret_irq;
}
int get_irq_next( int irq )
{
int ret_irq;
if ( ioinfo[irq] != INVALID_STORAGE_AREA )
{
if ( ioinfo[irq]->next )
{
if ( ioinfo[irq]->next->ui.flags.oper )
{
ret_irq = ioinfo[irq]->next->irq;
}
else
{
ret_irq = get_next_available_irq( ioinfo[irq]->next );
} /* endif */
}
else
{
ret_irq = -ENODEV;
} /* endif */
}
else
{
ret_irq = -EINVAL;
} /* endif */
return ret_irq;
}
int get_dev_info_by_irq( int irq, s390_dev_info_t *pdi)
{
SANITY_CHECK(irq);
if ( pdi == NULL )
return -EINVAL;
pdi->devno = ioinfo[irq]->schib.pmcw.dev;
pdi->irq = irq;
if ( ioinfo[irq]->ui.flags.oper
&& !ioinfo[irq]->ui.flags.unknown )
{
pdi->status = 0;
memcpy( &(pdi->sid_data),
&ioinfo[irq]->senseid,
sizeof( senseid_t));
}
else if ( ioinfo[irq]->ui.flags.unknown )
{
pdi->status = DEVSTAT_UNKNOWN_DEV;
memset( &(pdi->sid_data),
'\0',
sizeof( senseid_t));
pdi->sid_data.cu_type = 0xFFFF;
}
else
{
pdi->status = DEVSTAT_NOT_OPER;
memset( &(pdi->sid_data),
'\0',
sizeof( senseid_t));
pdi->sid_data.cu_type = 0xFFFF;
} /* endif */
if ( ioinfo[irq]->ui.flags.ready )
pdi->status |= DEVSTAT_DEVICE_OWNED;
return 0;
}
int get_dev_info_by_devno( __u16 devno, s390_dev_info_t *pdi)
{
int i;
int rc = -ENODEV;
if ( devno > 0x0000ffff )
return -ENODEV;
if ( pdi == NULL )
return -EINVAL;
for ( i=0; i <= highest_subchannel; i++ ) {
if ( ioinfo[i] != INVALID_STORAGE_AREA
&& ioinfo[i]->schib.pmcw.dev == devno )
{
pdi->irq = i;
pdi->devno = devno;
if ( ioinfo[i]->ui.flags.oper
&& !ioinfo[i]->ui.flags.unknown )
{
pdi->status = 0;
memcpy( &(pdi->sid_data),
&ioinfo[i]->senseid,
sizeof( senseid_t));
}
else if ( ioinfo[i]->ui.flags.unknown )
{
pdi->status = DEVSTAT_UNKNOWN_DEV;
memset( &(pdi->sid_data),
'\0',
sizeof( senseid_t));
pdi->sid_data.cu_type = 0xFFFF;
}
else
{
pdi->status = DEVSTAT_NOT_OPER;
memset( &(pdi->sid_data),
'\0',
sizeof( senseid_t));
pdi->sid_data.cu_type = 0xFFFF;
} /* endif */
if ( ioinfo[i]->ui.flags.ready )
pdi->status |= DEVSTAT_DEVICE_OWNED;
rc = 0; /* found */
break;
} /* endif */
} /* endfor */
return( rc);
}
int get_irq_by_devno( __u16 devno )
{
int i;
int rc = -1;
if ( devno <= 0x0000ffff )
{
for ( i=0; i <= highest_subchannel; i++ )
{
if ( (ioinfo[i] != INVALID_STORAGE_AREA )
&& (ioinfo[i]->schib.pmcw.dev == devno)
&& (ioinfo[i]->schib.pmcw.dnv == 1 ) )
{
rc = i;
break;
} /* endif */
} /* endfor */
} /* endif */
return( rc);
}
unsigned int get_devno_by_irq( int irq )
{
if ( ( irq > highest_subchannel )
|| ( irq < 0 )
|| ( ioinfo[irq] == INVALID_STORAGE_AREA ) )
{
return -1;
} /* endif */
/*
* we don't need to check for the device be operational
* as the initial STSCH will always present the device
* number defined by the IOCDS regardless of the device
* existing or not. However, there could be subchannels
* defined who's device number isn't valid ...
*/
if ( ioinfo[irq]->schib.pmcw.dnv )
return( ioinfo[irq]->schib.pmcw.dev );
else
return -1;
}
/*
* s390_device_recognition_irq
*
* Used for individual device recognition. Issues the device
* independant SenseID command to obtain info the device type.
*
*/
void s390_device_recognition_irq( int irq )
{
int ret;
char dbf_txt[15];
if (cio_debug_initialized) {
sprintf(dbf_txt, "devrec%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
/*
* We issue the SenseID command on I/O subchannels we think are
* operational only.
*/
if ( ( ioinfo[irq] != INVALID_STORAGE_AREA )
&& ( ioinfo[irq]->schib.pmcw.st == 0 )
&& ( ioinfo[irq]->ui.flags.oper == 1 ) )
{
int irq_ret;
devstat_t devstat;
irq_ret = request_irq( irq,
init_IRQ_handler,
SA_PROBE,
"INIT",
&devstat);
if ( !irq_ret )
{
ret = enable_cpu_sync_isc( irq );
if ( !ret )
{
ioinfo[irq]->ui.flags.unknown = 0;
memset( &ioinfo[irq]->senseid, '\0', sizeof( senseid_t));
s390_SenseID( irq, &ioinfo[irq]->senseid, 0xff );
#if 0 /* FIXME */
/*
* We initially check the configuration data for
* those devices with more than a single path
*/
if ( ioinfo[irq]->schib.pmcw.pim != 0x80 )
{
char *prcd;
int lrcd;
ret = read_conf_data( irq, (void **)&prcd, &lrcd, 0 );
if ( !ret ) // on success only ...
{
char buffer[80];
#ifdef CONFIG_DEBUG_IO
sprintf( buffer,
"RCD for device(%04X)/"
"subchannel(%04X) returns :\n",
ioinfo[irq]->schib.pmcw.dev,
irq );
s390_displayhex( buffer, prcd, lrcd );
#endif
if (cio_debug_initialized) {
sprintf( buffer,
"RCD for device(%04X)/"
"subchannel(%04X) returns :\n",
ioinfo[irq]->schib.pmcw.dev,
irq );
s390_displayhex2( buffer, prcd, lrcd, 2);
}
if ( init_IRQ_complete )
{
kfree( prcd );
}
else
{
free_bootmem( (unsigned long)prcd, lrcd );
} /* endif */
} /* endif */
} /* endif */
#endif
disable_cpu_sync_isc( irq );
} /* endif */
free_irq( irq, &devstat );
} /* endif */
} /* endif */
}
/*
* s390_device_recognition_all
*
* Used for system wide device recognition.
*
*/
void s390_device_recognition_all( void)
{
int irq = 0; /* let's start with subchannel 0 ... */
do
{
s390_device_recognition_irq( irq );
irq ++;
} while ( irq <= highest_subchannel );
}
/*
* Function: s390_redo_validation
* Look for no longer blacklisted devices
* FIXME: there must be a better way to do this...
*/
void s390_redo_validation(void)
{
int irq = 0;
int ret;
if (cio_debug_initialized) {
debug_text_event(cio_debug_trace_id, 0, "redoval");
}
do {
if (ioinfo[irq] == INVALID_STORAGE_AREA) {
ret = s390_validate_subchannel(irq, 0);
if (!ret) {
s390_device_recognition_irq(irq);
if (ioinfo[irq]->ui.flags.oper) {
devreg_t *pdevreg;
pdevreg = s390_search_devreg( ioinfo[irq] );
if ( pdevreg != NULL ) {
if ( pdevreg->oper_func != NULL )
pdevreg->oper_func( irq, pdevreg );
}
}
#ifdef CONFIG_PROC_FS
if (cio_proc_devinfo)
if (irq < MAX_CIO_PROCFS_ENTRIES) {
cio_procfs_device_create(ioinfo[irq]->devno);
}
#endif
}
}
irq++;
} while (irq<=highest_subchannel);
}
/*
* s390_search_devices
*
* Determines all subchannels available to the system.
*
*/
void s390_process_subchannels( void)
{
int ret;
int irq = 0; /* Evaluate all subchannels starting with 0 ... */
do
{
ret = s390_validate_subchannel( irq, 0);
if ( ret != -ENXIO)
irq++;
} while ( (ret != -ENXIO) && (irq < __MAX_SUBCHANNELS) );
highest_subchannel = (--irq);
printk( KERN_INFO "Highest subchannel number detected (hex) : %04X\n",
highest_subchannel);
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 0,
"Highest subchannel number detected (hex) : %04X\n",
highest_subchannel);
}
/*
* s390_validate_subchannel()
*
* Process the subchannel for the requested irq. Returns 1 for valid
* subchannels, otherwise 0.
*/
int s390_validate_subchannel( int irq, int enable )
{
int retry; /* retry count for status pending conditions */
int ccode; /* condition code for stsch() only */
int ccode2; /* condition code for other I/O routines */
schib_t *p_schib;
int ret;
char dbf_txt[15];
if (cio_debug_initialized) {
sprintf(dbf_txt, "valsch%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
/*
* The first subchannel that is not-operational (ccode==3)
* indicates that there aren't any more devices available.
*/
if ( ( init_IRQ_complete )
&& ( ioinfo[irq] != INVALID_STORAGE_AREA ) )
{
p_schib = &ioinfo[irq]->schib;
}
else
{
p_schib = p_init_schib;
} /* endif */
/*
* If we knew the device before we assume the worst case ...
*/
if ( ioinfo[irq] != INVALID_STORAGE_AREA )
{
ioinfo[irq]->ui.flags.oper = 0;
ioinfo[irq]->ui.flags.dval = 0;
} /* endif */
ccode = stsch( irq, p_schib);
if ( !ccode )
{
/*
* ... just being curious we check for non I/O subchannels
*/
if ( p_schib->pmcw.st )
{
printk( KERN_INFO "Subchannel %04X reports "
"non-I/O subchannel type %04X\n",
irq,
p_schib->pmcw.st);
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 0,
"Subchannel %04X reports non-I/O subchannel type %04X\n",
irq, p_schib->pmcw.st);
if ( ioinfo[irq] != INVALID_STORAGE_AREA )
ioinfo[irq]->ui.flags.oper = 0;
} /* endif */
if ( p_schib->pmcw.dnv )
{
if ( is_blacklisted( p_schib->pmcw.dev )) {
/*
* This device must not be known to Linux. So we simply say that
* there is no device and return ENODEV.
*/
#ifdef CONFIG_DEBUG_IO
printk( KERN_DEBUG "Blacklisted device detected at devno %04X\n", p_schib->pmcw.dev );
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 0,
"Blacklisted device detected at devno %04X\n",
p_schib->pmcw.dev);
ret = -ENODEV;
} else {
if ( ioinfo[irq] == INVALID_STORAGE_AREA )
{
if ( !init_IRQ_complete )
{
ioinfo[irq] =
(ioinfo_t *)alloc_bootmem_low( sizeof(ioinfo_t));
}
else
{
ioinfo[irq] =
(ioinfo_t *)kmalloc( sizeof(ioinfo_t),
GFP_DMA );
} /* endif */
memset( ioinfo[irq], '\0', sizeof( ioinfo_t));
memcpy( &ioinfo[irq]->schib,
p_init_schib,
sizeof( schib_t));
/*
* We have to insert the new ioinfo element
* into the linked list, either at its head,
* its tail or insert it.
*/
if ( ioinfo_head == NULL ) /* first element */
{
ioinfo_head = ioinfo[irq];
ioinfo_tail = ioinfo[irq];
}
else if ( irq < ioinfo_head->irq ) /* new head */
{
ioinfo[irq]->next = ioinfo_head;
ioinfo_head->prev = ioinfo[irq];
ioinfo_head = ioinfo[irq];
}
else if ( irq > ioinfo_tail->irq ) /* new tail */
{
ioinfo_tail->next = ioinfo[irq];
ioinfo[irq]->prev = ioinfo_tail;
ioinfo_tail = ioinfo[irq];
}
else /* insert element */
{
ioinfo_t *pi = ioinfo_head;
for (pi=ioinfo_head; pi!=NULL; pi=pi->next) {
if ( irq < pi->next->irq )
{
ioinfo[irq]->next = pi->next;
ioinfo[irq]->prev = pi;
pi->next->prev = ioinfo[irq];
pi->next = ioinfo[irq];
break;
} /* endif */
}
} /* endif */
} /* endif */
// initialize some values ...
ioinfo[irq]->ui.flags.pgid_supp = 1;
ioinfo[irq]->opm = ioinfo[irq]->schib.pmcw.pim
& ioinfo[irq]->schib.pmcw.pam
& ioinfo[irq]->schib.pmcw.pom;
if ( cio_show_msg )
{
printk( KERN_INFO"Detected device %04X "
"on subchannel %04X"
" - PIM = %02X, PAM = %02X, POM = %02X\n",
ioinfo[irq]->schib.pmcw.dev,
irq,
ioinfo[irq]->schib.pmcw.pim,
ioinfo[irq]->schib.pmcw.pam,
ioinfo[irq]->schib.pmcw.pom);
} /* endif */
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 0,
"Detected device %04X "
"on subchannel %04X"
" - PIM = %02X, PAM = %02X, POM = %02X\n",
ioinfo[irq]->schib.pmcw.dev,
irq,
ioinfo[irq]->schib.pmcw.pim,
ioinfo[irq]->schib.pmcw.pam,
ioinfo[irq]->schib.pmcw.pom);
/*
* initialize ioinfo structure
*/
ioinfo[irq]->irq = irq;
if(!ioinfo[irq]->ui.flags.ready)
{
ioinfo[irq]->nopfunc = NULL;
ioinfo[irq]->ui.flags.busy = 0;
ioinfo[irq]->ui.flags.dval = 1;
ioinfo[irq]->devstat.intparm = 0;
}
ioinfo[irq]->devstat.devno = ioinfo[irq]->schib.pmcw.dev;
ioinfo[irq]->devno = ioinfo[irq]->schib.pmcw.dev;
/*
* We should have at least one CHPID ...
*/
if ( ioinfo[irq]->opm )
{
/*
* We now have to initially ...
* ... set "interruption sublass"
* ... enable "concurrent sense"
* ... enable "multipath mode" if more than one
* CHPID is available. This is done regardless
* whether multiple paths are available for us.
*
* Note : we don't enable the device here, this is temporarily
* done during device sensing below.
*/
ioinfo[irq]->schib.pmcw.isc = 3; /* could be smth. else */
ioinfo[irq]->schib.pmcw.csense = 1; /* concurrent sense */
ioinfo[irq]->schib.pmcw.ena = enable;
ioinfo[irq]->schib.pmcw.intparm =
ioinfo[irq]->schib.pmcw.dev;
if ( ( ioinfo[irq]->opm != 0x80 )
&& ( ioinfo[irq]->opm != 0x40 )
&& ( ioinfo[irq]->opm != 0x20 )
&& ( ioinfo[irq]->opm != 0x10 )
&& ( ioinfo[irq]->opm != 0x08 )
&& ( ioinfo[irq]->opm != 0x04 )
&& ( ioinfo[irq]->opm != 0x02 )
&& ( ioinfo[irq]->opm != 0x01 ) )
{
ioinfo[irq]->schib.pmcw.mp = 1; /* multipath mode */
} /* endif */
retry = 5;
do
{
ccode2 = msch_err( irq, &ioinfo[irq]->schib);
switch (ccode2) {
case 0: // successful completion
//
// concurrent sense facility available ...
//
ioinfo[irq]->ui.flags.oper = 1;
ioinfo[irq]->ui.flags.consns = 1;
ret = 0;
break;
case 1: // status pending
//
// How can we have a pending status as
// device is disabled for interrupts ?
// Anyway, process it ...
//
ioinfo[irq]->ui.flags.s_pend = 1;
s390_process_IRQ( irq);
ioinfo[irq]->ui.flags.s_pend = 0;
retry--;
ret = -EIO;
break;
case 2: // busy
/*
* we mark it not-oper as we can't
* properly operate it !
*/
ioinfo[irq]->ui.flags.oper = 0;
udelay( 100); /* allow for recovery */
retry--;
ret = -EBUSY;
break;
case 3: // not operational
ioinfo[irq]->ui.flags.oper = 0;
retry = 0;
ret = -ENODEV;
break;
default:
#define PGMCHK_OPERAND_EXC 0x15
if ( (ccode2 & PGMCHK_OPERAND_EXC) == PGMCHK_OPERAND_EXC )
{
/*
* re-issue the modify subchannel without trying to
* enable the concurrent sense facility
*/
ioinfo[irq]->schib.pmcw.csense = 0;
ccode2 = msch_err( irq, &ioinfo[irq]->schib);
if ( ccode2 != 0 )
{
printk( KERN_ERR " ... msch() (2) failed with CC = %X\n",
ccode2 );
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 0,
"msch() (2) failed with CC=%X\n",
ccode2);
ioinfo[irq]->ui.flags.oper = 0;
ret = -EIO;
}
else
{
ioinfo[irq]->ui.flags.oper = 1;
ioinfo[irq]->ui.flags.consns = 0;
ret = 0;
} /* endif */
}
else
{
printk( KERN_ERR " ... msch() (1) failed with CC = %X\n",
ccode2);
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 0,
"msch() (1) failed with CC = %X\n",
ccode2);
ioinfo[irq]->ui.flags.oper = 0;
ret = -EIO;
} /* endif */
retry = 0;
break;
} /* endswitch */
} while ( ccode2 && retry );
if ( (ccode2 != 0) && (ccode2 != 3) && (!retry) )
{
printk( KERN_ERR " ... msch() retry count for "
"subchannel %04X exceeded, CC = %d\n",
irq,
ccode2);
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 0,
" ... msch() retry count for "
"subchannel %04X exceeded, CC = %d\n",
irq, ccode2);
} /* endif */
}
else
{
/* no path available ... */
ioinfo[irq]->ui.flags.oper = 0;
ret = -ENODEV;
} /* endif */
}
}
else
{
ret = -ENODEV;
} /* endif */
}
else
{
ret = -ENXIO;
} /* endif */
return( ret );
}
/*
* s390_SenseID
*
* Try to obtain the 'control unit'/'device type' information
* associated with the subchannel.
*
* The function is primarily meant to be called without irq
* action handler in place. However, it also allows for
* use with an action handler in place. If there is already
* an action handler registered assure it can handle the
* s390_SenseID() related device interrupts - interruption
* parameter used is 0x00E2C9C4 ( SID ).
*/
int s390_SenseID( int irq, senseid_t *sid, __u8 lpm )
{
ccw1_t *sense_ccw; /* ccw area for SenseID command */
senseid_t isid; /* internal sid */
devstat_t devstat; /* required by request_irq() */
__u8 pathmask; /* calulate path mask */
__u8 domask; /* path mask to use */
int inlreq; /* inline request_irq() */
int irq_ret; /* return code */
devstat_t *pdevstat; /* ptr to devstat in use */
int retry; /* retry count */
int io_retry; /* retry indicator */
senseid_t *psid = sid;/* start with the external buffer */
int sbuffer = 0; /* switch SID data buffer */
char dbf_txt[15];
int failure = 0; /* nothing went wrong yet */
SANITY_CHECK(irq);
if ( ioinfo[irq]->ui.flags.oper == 0 )
{
return( -ENODEV );
} /* endif */
if (cio_debug_initialized) {
sprintf(dbf_txt, "snsID%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
inlreq = 0; /* to make the compiler quiet... */
if ( !ioinfo[irq]->ui.flags.ready )
{
pdevstat = &devstat;
/*
* Perform SENSE ID command processing. We have to request device
* ownership and provide a dummy I/O handler. We issue sync. I/O
* requests and evaluate the devstat area on return therefore
* we don't need a real I/O handler in place.
*/
irq_ret = request_irq( irq, init_IRQ_handler, SA_PROBE, "SID", &devstat);
if ( irq_ret == 0 )
inlreq = 1;
}
else
{
inlreq = 0;
irq_ret = 0;
pdevstat = ioinfo[irq]->irq_desc.dev_id;
} /* endif */
if ( irq_ret == 0 )
{
int i;
s390irq_spin_lock( irq);
if ( init_IRQ_complete )
{
sense_ccw = kmalloc( 2*sizeof( ccw1_t), GFP_DMA);
}
else
{
sense_ccw = alloc_bootmem_low( 2*sizeof( ccw1_t));
} /* endif */
// more than one path installed ?
if ( ioinfo[irq]->schib.pmcw.pim != 0x80 )
{
sense_ccw[0].cmd_code = CCW_CMD_SUSPEND_RECONN;
sense_ccw[0].cda = 0;
sense_ccw[0].count = 0;
sense_ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
sense_ccw[1].cmd_code = CCW_CMD_SENSE_ID;
sense_ccw[1].cda = (__u32)virt_to_phys( sid );
sense_ccw[1].count = sizeof( senseid_t);
sense_ccw[1].flags = CCW_FLAG_SLI;
}
else
{
sense_ccw[0].cmd_code = CCW_CMD_SENSE_ID;
sense_ccw[0].cda = (__u32)virt_to_phys( sid );
sense_ccw[0].count = sizeof( senseid_t);
sense_ccw[0].flags = CCW_FLAG_SLI;
} /* endif */
for ( i = 0 ; (i < 8) ; i++ )
{
pathmask = 0x80 >> i;
domask = ioinfo[irq]->opm & pathmask;
if ( lpm )
domask &= lpm;
if ( domask )
{
failure = 0;
psid->reserved = 0;
psid->cu_type = 0xFFFF; /* initialize fields ... */
psid->cu_model = 0;
psid->dev_type = 0;
psid->dev_model = 0;
retry = 5; /* retry count */
io_retry = 1; /* enable retries */
/*
* We now issue a SenseID request. In case of BUSY,
* STATUS PENDING or non-CMD_REJECT error conditions
* we run simple retries.
*/
do
{
memset( pdevstat, '\0', sizeof( devstat_t) );
irq_ret = s390_start_IO( irq,
sense_ccw,
0x00E2C9C4, // == SID
domask,
DOIO_WAIT_FOR_INTERRUPT
| DOIO_TIMEOUT
| DOIO_VALID_LPM
| DOIO_DONT_CALL_INTHDLR );
if ( psid->cu_type == 0xFFFF )
{
failure = 1;
if ( pdevstat->flag & DEVSTAT_STATUS_PENDING )
{
#ifdef CONFIG_DEBUG_IO
printk( KERN_DEBUG "SenseID : device %04X on "
"Subchannel %04X "
"reports pending status, "
"retry : %d\n",
ioinfo[irq]->schib.pmcw.dev,
irq,
retry);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"SenseID : device %04X on "
"Subchannel %04X "
"reports pending status, "
"retry : %d\n",
ioinfo[irq]->schib.pmcw.dev,
irq,
retry);
} /* endif */
else if ( pdevstat->flag & DEVSTAT_FLAG_SENSE_AVAIL )
{
/*
* if the device doesn't support the SenseID
* command further retries wouldn't help ...
*/
if ( pdevstat->ii.sense.data[0]
& (SNS0_CMD_REJECT | SNS0_INTERVENTION_REQ) )
{
#ifdef CONFIG_DEBUG_IO
printk( KERN_ERR "SenseID : device %04X on "
"Subchannel %04X "
"reports cmd reject or "
"intervention required\n",
ioinfo[irq]->schib.pmcw.dev,
irq);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"SenseID : device %04X on "
"Subchannel %04X "
"reports cmd reject or "
"intervention required\n",
ioinfo[irq]->schib.pmcw.dev,
irq);
io_retry = 0;
}
else
{
#ifdef CONFIG_DEBUG_IO
printk( KERN_WARNING "SenseID : UC on "
"dev %04X, "
"retry %d, "
"lpum %02X, "
"cnt %02d, "
"sns :"
" %02X%02X%02X%02X "
"%02X%02X%02X%02X ...\n",
ioinfo[irq]->schib.pmcw.dev,
retry,
pdevstat->lpum,
pdevstat->scnt,
pdevstat->ii.sense.data[0],
pdevstat->ii.sense.data[1],
pdevstat->ii.sense.data[2],
pdevstat->ii.sense.data[3],
pdevstat->ii.sense.data[4],
pdevstat->ii.sense.data[5],
pdevstat->ii.sense.data[6],
pdevstat->ii.sense.data[7]);
#endif
if (cio_debug_initialized) {
debug_sprintf_event(cio_debug_msg_id, 2,
"SenseID : UC on "
"dev %04X, "
"retry %d, "
"lpum %02X, "
"cnt %02d, "
"sns :"
" %02X%02X%02X%02X "
"%02X%02X%02X%02X ...\n",
ioinfo[irq]->schib.pmcw.dev,
retry,
pdevstat->lpum,
pdevstat->scnt,
pdevstat->ii.sense.data[0],
pdevstat->ii.sense.data[1],
pdevstat->ii.sense.data[2],
pdevstat->ii.sense.data[3],
pdevstat->ii.sense.data[4],
pdevstat->ii.sense.data[5],
pdevstat->ii.sense.data[6],
pdevstat->ii.sense.data[7]);
if (psid->reserved != 0xFF)
debug_sprintf_event(cio_debug_msg_id, 2,
"SenseID was not properly "
"executed!\n");
}
} /* endif */
}
else if ( ( pdevstat->flag & DEVSTAT_NOT_OPER )
|| ( irq_ret == -ENODEV ) )
{
#ifdef CONFIG_DEBUG_IO
printk( KERN_ERR "SenseID : path %02X for "
"device %04X on "
"subchannel %04X "
"is 'not operational'\n",
domask,
ioinfo[irq]->schib.pmcw.dev,
irq);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"SenseID : path %02X for "
"device %04X on "
"subchannel %04X "
"is 'not operational'\n",
domask,
ioinfo[irq]->schib.pmcw.dev,
irq);
io_retry = 0;
ioinfo[irq]->opm &= ~domask;
}
else if ( ( pdevstat->flag !=
( DEVSTAT_START_FUNCTION
| DEVSTAT_FINAL_STATUS ) )
&& !( pdevstat->flag &
DEVSTAT_STATUS_PENDING ) )
{
#ifdef CONFIG_DEBUG_IO
printk( KERN_INFO "SenseID : start_IO() for "
"device %04X on "
"subchannel %04X "
"returns %d, retry %d, "
"status %04X\n",
ioinfo[irq]->schib.pmcw.dev,
irq,
irq_ret,
retry,
pdevstat->flag);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"SenseID : start_IO() for "
"device %04X on "
"subchannel %04X "
"returns %d, retry %d, "
"status %04X\n",
ioinfo[irq]->schib.pmcw.dev,
irq,
irq_ret,
retry,
pdevstat->flag);
} /* endif */
}
else // we got it ...
{
if (psid->reserved != 0xFF) {
/* No, we failed after all... */
failure = 1;
retry--;
} else {
if ( !sbuffer ) // switch buffers
{
/*
* we report back the
* first hit only
*/
psid = &isid;
if ( ioinfo[irq]->schib.pmcw.pim != 0x80 )
{
sense_ccw[1].cda = (__u32)virt_to_phys( psid );
}
else
{
sense_ccw[0].cda = (__u32)virt_to_phys( psid );
} /* endif */
/*
* if just the very first
* was requested to be
* sensed disable further
* scans.
*/
if ( !lpm )
lpm = domask;
sbuffer = 1;
} /* endif */
if ( pdevstat->rescnt < (sizeof( senseid_t) - 8) )
{
ioinfo[irq]->ui.flags.esid = 1;
} /* endif */
io_retry = 0;
}
} /* endif */
if ( io_retry )
{
retry--;
if ( retry == 0 )
{
io_retry = 0;
} /* endif */
} /* endif */
if ((failure) && (io_retry)) {
/* reset fields... */
failure = 0;
psid->reserved = 0;
psid->cu_type = 0xFFFF;
psid->cu_model = 0;
psid->dev_type = 0;
psid->dev_model = 0;
}
} while ( (io_retry) );
} /* endif - domask */
} /* endfor */
if ( init_IRQ_complete )
{
kfree( sense_ccw );
}
else
{
free_bootmem( (unsigned long)sense_ccw, 2*sizeof(ccw1_t) );
} /* endif */
s390irq_spin_unlock( irq);
/*
* If we installed the irq action handler we have to
* release it too.
*/
if ( inlreq )
free_irq( irq, pdevstat);
/*
* if running under VM check there ... perhaps we should do
* only if we suffered a command reject, but it doesn't harm
*/
if ( ( sid->cu_type == 0xFFFF )
&& ( MACHINE_IS_VM ) )
{
VM_virtual_device_info( ioinfo[irq]->schib.pmcw.dev,
sid );
} /* endif */
if ( sid->cu_type == 0xFFFF )
{
/*
* SenseID CU-type of 0xffff indicates that no device
* information could be retrieved (pre-init value).
*
* If we can't couldn't identify the device type we
* consider the device "not operational".
*/
#ifdef CONFIG_DEBUG_IO
printk( KERN_WARNING "SenseID : unknown device %04X on subchannel %04X\n",
ioinfo[irq]->schib.pmcw.dev,
irq);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"SenseID : unknown device %04X on subchannel %04X\n",
ioinfo[irq]->schib.pmcw.dev,
irq);
ioinfo[irq]->ui.flags.unknown = 1;
} /* endif */
/*
* Issue device info message if unit was operational .
*/
if ( !ioinfo[irq]->ui.flags.unknown ) {
if ( sid->dev_type != 0 ) {
if ( cio_show_msg )
printk( KERN_INFO"SenseID : device %04X reports: "
"CU Type/Mod = %04X/%02X,"
" Dev Type/Mod = %04X/%02X\n",
ioinfo[irq]->schib.pmcw.dev,
sid->cu_type,
sid->cu_model,
sid->dev_type,
sid->dev_model);
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"SenseID : device %04X reports: "
"CU Type/Mod = %04X/%02X,"
" Dev Type/Mod = %04X/%02X\n",
ioinfo[irq]->schib.pmcw.dev,
sid->cu_type,
sid->cu_model,
sid->dev_type,
sid->dev_model);
} else {
if ( cio_show_msg )
printk( KERN_INFO"SenseID : device %04X reports:"
" Dev Type/Mod = %04X/%02X\n",
ioinfo[irq]->schib.pmcw.dev,
sid->cu_type,
sid->cu_model);
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"SenseID : device %04X reports:"
" Dev Type/Mod = %04X/%02X\n",
ioinfo[irq]->schib.pmcw.dev,
sid->cu_type,
sid->cu_model);
} /* endif */
} /* endif */
if ( !ioinfo[irq]->ui.flags.unknown )
irq_ret = 0;
else
irq_ret = -ENODEV;
} /* endif */
return( irq_ret );
}
static int __inline__ s390_SetMultiPath( int irq )
{
int cc;
cc = stsch( irq, &ioinfo[irq]->schib );
if ( !cc )
{
ioinfo[irq]->schib.pmcw.mp = 1; /* multipath mode */
cc = msch( irq, &ioinfo[irq]->schib );
} /* endif */
return( cc);
}
/*
* Device Path Verification
*
* Path verification is accomplished by checking which paths (CHPIDs) are
* available. Further, a path group ID is set, if possible in multipath
* mode, otherwise in single path mode.
*
* Note : This function must not be called during normal device recognition,
* but during device driver initiated request_irq() processing only.
*/
int s390_DevicePathVerification( int irq, __u8 usermask )
{
int ccode;
__u8 pathmask;
__u8 domask;
int ret = 0;
char dbf_txt[15];
if (cio_debug_initialized) {
sprintf(dbf_txt, "dpver%x", irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
if ( ioinfo[irq]->ui.flags.pgid_supp == 0 )
{
return( 0); // just exit ...
} /* endif */
ccode = stsch( irq, &(ioinfo[irq]->schib) );
if ( ccode )
{
ret = -ENODEV;
}
else if ( ioinfo[irq]->schib.pmcw.pim == 0x80 )
{
/*
* no error, just not required for single path only devices
*/
ioinfo[irq]->ui.flags.pgid_supp = 0;
ret = 0;
}
else
{
int i;
pgid_t pgid;
__u8 dev_path;
int first = 1;
ioinfo[irq]->opm = ioinfo[irq]->schib.pmcw.pim
& ioinfo[irq]->schib.pmcw.pam
& ioinfo[irq]->schib.pmcw.pom;
if ( usermask )
{
dev_path = usermask;
}
else
{
dev_path = ioinfo[irq]->opm;
} /* endif */
/*
* let's build a path group ID if we don't have one yet
*/
if ( ioinfo[irq]->ui.flags.pgid == 0)
{
ioinfo[irq]->pgid.cpu_addr = *(__u16 *)__LC_CPUADDR;
ioinfo[irq]->pgid.cpu_id = ((cpuid_t *)__LC_CPUID)->ident;
ioinfo[irq]->pgid.cpu_model = ((cpuid_t *)__LC_CPUID)->machine;
ioinfo[irq]->pgid.tod_high = *(__u32 *)&irq_IPL_TOD;
ioinfo[irq]->ui.flags.pgid = 1;
} /* endif */
memcpy( &pgid, &ioinfo[irq]->pgid, sizeof(pgid_t));
for ( i = 0; i < 8 && !ret ; i++)
{
pathmask = 0x80 >> i;
domask = dev_path & pathmask;
if ( domask )
{
ret = s390_SetPGID( irq, domask, &pgid );
/*
* For the *first* path we are prepared
* for recovery
*
* - If we fail setting the PGID we assume its
* using a different PGID already (VM) we
* try to sense.
*/
if ( ret == -EOPNOTSUPP && first )
{
*(int *)&pgid = 0;
ret = s390_SensePGID( irq, domask, &pgid);
first = 0;
if ( ret == 0 )
{
/*
* Check whether we retrieved
* a reasonable PGID ...
*/
if ( pgid.inf.ps.state1 == SNID_STATE1_GROUPED )
{
memcpy( &(ioinfo[irq]->pgid),
&pgid,
sizeof(pgid_t) );
}
else // ungrouped or garbage ...
{
ret = -EOPNOTSUPP;
} /* endif */
}
else
{
ioinfo[irq]->ui.flags.pgid_supp = 0;
#ifdef CONFIG_DEBUG_IO
printk( KERN_WARNING "PathVerification(%04X) "
"- Device %04X doesn't "
" support path grouping\n",
irq,
ioinfo[irq]->schib.pmcw.dev);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"PathVerification(%04X) "
"- Device %04X doesn't "
" support path grouping\n",
irq,
ioinfo[irq]->schib.pmcw.dev);
} /* endif */
}
else if ( ret == -EIO )
{
#ifdef CONFIG_DEBUG_IO
printk( KERN_ERR "PathVerification(%04X) - I/O error "
"on device %04X\n", irq,
ioinfo[irq]->schib.pmcw.dev);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"PathVerification(%04X) - I/O error "
"on device %04X\n", irq,
ioinfo[irq]->schib.pmcw.dev);
ioinfo[irq]->ui.flags.pgid_supp = 0;
} else {
#ifdef CONFIG_DEBUG_IO
printk( KERN_ERR "PathVerification(%04X) "
"- Unexpected error on device %04X\n",
irq,
ioinfo[irq]->schib.pmcw.dev);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"PathVerification(%04X) - "
"Unexpected error on device %04X\n",
irq,
ioinfo[irq]->schib.pmcw.dev);
ioinfo[irq]->ui.flags.pgid_supp = 0;
} /* endif */
} /* endif */
} /* endfor */
} /* endif */
return ret;
}
/*
* s390_SetPGID
*
* Set Path Group ID
*
*/
int s390_SetPGID( int irq, __u8 lpm, pgid_t *pgid )
{
ccw1_t *spid_ccw; /* ccw area for SPID command */
devstat_t devstat; /* required by request_irq() */
devstat_t *pdevstat = &devstat;
unsigned long flags;
char dbf_txt[15];
int irq_ret = 0; /* return code */
int retry = 5; /* retry count */
int inlreq = 0; /* inline request_irq() */
int mpath = 1; /* try multi-path first */
SANITY_CHECK(irq);
if ( ioinfo[irq]->ui.flags.oper == 0 )
{
return( -ENODEV );
} /* endif */
if (cio_debug_initialized) {
sprintf(dbf_txt,"SPID%x",irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
if ( !ioinfo[irq]->ui.flags.ready )
{
/*
* Perform SetPGID command processing. We have to request device
* ownership and provide a dummy I/O handler. We issue sync. I/O
* requests and evaluate the devstat area on return therefore
* we don't need a real I/O handler in place.
*/
irq_ret = request_irq( irq,
init_IRQ_handler,
SA_PROBE,
"SPID",
pdevstat);
if ( irq_ret == 0 )
inlreq = 1;
}
else
{
pdevstat = ioinfo[irq]->irq_desc.dev_id;
} /* endif */
if ( irq_ret == 0 )
{
s390irq_spin_lock_irqsave( irq, flags);
if ( init_IRQ_complete )
{
spid_ccw = kmalloc( 2*sizeof( ccw1_t), GFP_DMA);
}
else
{
spid_ccw = alloc_bootmem_low( 2*sizeof( ccw1_t));
} /* endif */
spid_ccw[0].cmd_code = CCW_CMD_SUSPEND_RECONN;
spid_ccw[0].cda = 0;
spid_ccw[0].count = 0;
spid_ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
spid_ccw[1].cmd_code = CCW_CMD_SET_PGID;
spid_ccw[1].cda = (__u32)virt_to_phys( pgid );
spid_ccw[1].count = sizeof( pgid_t);
spid_ccw[1].flags = CCW_FLAG_SLI;
pgid->inf.fc = SPID_FUNC_MULTI_PATH | SPID_FUNC_ESTABLISH;
/*
* We now issue a SetPGID request. In case of BUSY
* or STATUS PENDING conditions we retry 5 times.
*/
do
{
memset( pdevstat, '\0', sizeof( devstat_t) );
irq_ret = s390_start_IO( irq,
spid_ccw,
0xE2D7C9C4, // == SPID
lpm, // n/a
DOIO_WAIT_FOR_INTERRUPT
| DOIO_VALID_LPM
| DOIO_DONT_CALL_INTHDLR );
if ( !irq_ret )
{
if ( pdevstat->flag & DEVSTAT_STATUS_PENDING )
{
#ifdef CONFIG_DEBUG_IO
printk( KERN_DEBUG "SPID - Device %04X "
"on Subchannel %04X "
"reports pending status, "
"retry : %d\n",
ioinfo[irq]->schib.pmcw.dev,
irq,
retry);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"SPID - Device %04X "
"on Subchannel %04X "
"reports pending status, "
"retry : %d\n",
ioinfo[irq]->schib.pmcw.dev,
irq,
retry);
retry--;
irq_ret = -EIO;
} /* endif */
if ( pdevstat->flag == ( DEVSTAT_START_FUNCTION
| DEVSTAT_FINAL_STATUS ) )
{
retry = 0; // successfully set ...
irq_ret = 0;
}
else if ( pdevstat->flag & DEVSTAT_FLAG_SENSE_AVAIL )
{
/*
* If the device doesn't support the
* Sense Path Group ID command
* further retries wouldn't help ...
*/
if ( pdevstat->ii.sense.data[0] & SNS0_CMD_REJECT )
{
if ( mpath )
{
/*
* We now try single path mode.
* Note we must not issue the suspend
* multipath reconnect, or we will get
* a command reject by tapes.
*/
spid_ccw[0].cmd_code = CCW_CMD_SET_PGID;
spid_ccw[0].cda = (__u32)virt_to_phys( pgid );
spid_ccw[0].count = sizeof( pgid_t);
spid_ccw[0].flags = CCW_FLAG_SLI;
pgid->inf.fc = SPID_FUNC_SINGLE_PATH
| SPID_FUNC_ESTABLISH;
mpath = 0;
retry--;
irq_ret = -EIO;
}
else
{
irq_ret = -EOPNOTSUPP;
retry = 0;
} /* endif */
}
else
{
#ifdef CONFIG_DEBUG_IO
printk( KERN_WARNING "SPID - device %04X,"
" unit check,"
" retry %d, cnt %02d,"
" sns :"
" %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
ioinfo[irq]->schib.pmcw.dev,
retry,
pdevstat->scnt,
pdevstat->ii.sense.data[0],
pdevstat->ii.sense.data[1],
pdevstat->ii.sense.data[2],
pdevstat->ii.sense.data[3],
pdevstat->ii.sense.data[4],
pdevstat->ii.sense.data[5],
pdevstat->ii.sense.data[6],
pdevstat->ii.sense.data[7]);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"SPID - device %04X,"
" unit check,"
" retry %d, cnt %02d,"
" sns :"
" %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
ioinfo[irq]->schib.pmcw.dev,
retry,
pdevstat->scnt,
pdevstat->ii.sense.data[0],
pdevstat->ii.sense.data[1],
pdevstat->ii.sense.data[2],
pdevstat->ii.sense.data[3],
pdevstat->ii.sense.data[4],
pdevstat->ii.sense.data[5],
pdevstat->ii.sense.data[6],
pdevstat->ii.sense.data[7]);
retry--;
irq_ret = -EIO;
} /* endif */
}
else if ( pdevstat->flag & DEVSTAT_NOT_OPER )
{
/* don't issue warnings during startup unless requested*/
if (init_IRQ_complete || cio_notoper_msg) {
printk( KERN_WARNING "SPID - Device %04X "
"on Subchannel %04X "
"became 'not operational'\n",
ioinfo[irq]->schib.pmcw.dev,
irq);
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"SPID - Device %04X "
"on Subchannel %04X "
"became 'not operational'\n",
ioinfo[irq]->schib.pmcw.dev,
irq);
}
retry = 0;
irq_ret = -EIO;
} /* endif */
}
else if ( irq_ret != -ENODEV )
{
retry--;
irq_ret = -EIO;
}
else
{
retry = 0;
irq_ret = -ENODEV;
} /* endif */
} while ( retry > 0 );
if ( init_IRQ_complete )
{
kfree( spid_ccw );
}
else
{
free_bootmem( (unsigned long)spid_ccw, 2*sizeof(ccw1_t) );
} /* endif */
s390irq_spin_unlock_irqrestore( irq, flags);
/*
* If we installed the irq action handler we have to
* release it too.
*/
if ( inlreq )
free_irq( irq, pdevstat);
} /* endif */
return( irq_ret );
}
/*
* s390_SensePGID
*
* Sense Path Group ID
*
*/
int s390_SensePGID( int irq, __u8 lpm, pgid_t *pgid )
{
ccw1_t *snid_ccw; /* ccw area for SNID command */
devstat_t devstat; /* required by request_irq() */
devstat_t *pdevstat = &devstat;
char dbf_txt[15];
int irq_ret = 0; /* return code */
int retry = 5; /* retry count */
int inlreq = 0; /* inline request_irq() */
unsigned long flags;
SANITY_CHECK(irq);
if ( ioinfo[irq]->ui.flags.oper == 0 )
{
return( -ENODEV );
} /* endif */
if (cio_debug_initialized) {
sprintf(dbf_txt,"SNID%x",irq);
debug_text_event(cio_debug_trace_id, 4, dbf_txt);
}
if ( !ioinfo[irq]->ui.flags.ready )
{
/*
* Perform SENSE PGID command processing. We have to request device
* ownership and provide a dummy I/O handler. We issue sync. I/O
* requests and evaluate the devstat area on return therefore
* we don't need a real I/O handler in place.
*/
irq_ret = request_irq( irq,
init_IRQ_handler,
SA_PROBE,
"SNID",
pdevstat);
if ( irq_ret == 0 )
inlreq = 1;
}
else
{
pdevstat = ioinfo[irq]->irq_desc.dev_id;
} /* endif */
if ( irq_ret == 0 )
{
s390irq_spin_lock_irqsave( irq, flags);
if ( init_IRQ_complete )
{
snid_ccw = kmalloc( sizeof( ccw1_t), GFP_DMA);
}
else
{
snid_ccw = alloc_bootmem_low( sizeof( ccw1_t));
} /* endif */
snid_ccw->cmd_code = CCW_CMD_SENSE_PGID;
snid_ccw->cda = (__u32)virt_to_phys( pgid );
snid_ccw->count = sizeof( pgid_t);
snid_ccw->flags = CCW_FLAG_SLI;
/*
* We now issue a SensePGID request. In case of BUSY
* or STATUS PENDING conditions we retry 5 times.
*/
do
{
memset( pdevstat, '\0', sizeof( devstat_t) );
irq_ret = s390_start_IO( irq,
snid_ccw,
0xE2D5C9C4, // == SNID
lpm, // n/a
DOIO_WAIT_FOR_INTERRUPT
| DOIO_VALID_LPM
| DOIO_DONT_CALL_INTHDLR );
if ( irq_ret == 0 )
{
if ( pdevstat->flag & DEVSTAT_FLAG_SENSE_AVAIL )
{
/*
* If the device doesn't support the
* Sense Path Group ID command
* further retries wouldn't help ...
*/
if ( pdevstat->ii.sense.data[0] & SNS0_CMD_REJECT )
{
retry = 0;
irq_ret = -EOPNOTSUPP;
}
else
{
#ifdef CONFIG_DEBUG_IO
printk( KERN_WARNING "SNID - device %04X,"
" unit check,"
" flag %04X, "
" retry %d, cnt %02d,"
" sns :"
" %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
ioinfo[irq]->schib.pmcw.dev,
pdevstat->flag,
retry,
pdevstat->scnt,
pdevstat->ii.sense.data[0],
pdevstat->ii.sense.data[1],
pdevstat->ii.sense.data[2],
pdevstat->ii.sense.data[3],
pdevstat->ii.sense.data[4],
pdevstat->ii.sense.data[5],
pdevstat->ii.sense.data[6],
pdevstat->ii.sense.data[7]);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"SNID - device %04X,"
" unit check,"
" flag %04X, "
" retry %d, cnt %02d,"
" sns :"
" %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
ioinfo[irq]->schib.pmcw.dev,
pdevstat->flag,
retry,
pdevstat->scnt,
pdevstat->ii.sense.data[0],
pdevstat->ii.sense.data[1],
pdevstat->ii.sense.data[2],
pdevstat->ii.sense.data[3],
pdevstat->ii.sense.data[4],
pdevstat->ii.sense.data[5],
pdevstat->ii.sense.data[6],
pdevstat->ii.sense.data[7]);
retry--;
irq_ret = -EIO;
} /* endif */
}
else if ( pdevstat->flag & DEVSTAT_NOT_OPER )
{
/* don't issue warnings during startup unless requested*/
if (init_IRQ_complete || cio_notoper_msg) {
printk( KERN_WARNING "SNID - Device %04X "
"on Subchannel %04X "
"became 'not operational'\n",
ioinfo[irq]->schib.pmcw.dev,
irq);
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"SNID - Device %04X "
"on Subchannel %04X "
"became 'not operational'\n",
ioinfo[irq]->schib.pmcw.dev,
irq);
}
retry = 0;
irq_ret = -EIO;
}
else
{
retry = 0; // success ...
irq_ret = 0;
} /* endif */
}
else if ( irq_ret != -ENODEV ) // -EIO, or -EBUSY
{
if ( pdevstat->flag & DEVSTAT_STATUS_PENDING )
{
#ifdef CONFIG_DEBUG_IO
printk( KERN_INFO "SNID - Device %04X "
"on Subchannel %04X "
"reports pending status, "
"retry : %d\n",
ioinfo[irq]->schib.pmcw.dev,
irq,
retry);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"SNID - Device %04X "
"on Subchannel %04X "
"reports pending status, "
"retry : %d\n",
ioinfo[irq]->schib.pmcw.dev,
irq,
retry);
} /* endif */
printk( KERN_WARNING "SNID - device %04X,"
" start_io() reports rc : %d, retrying ...\n",
ioinfo[irq]->schib.pmcw.dev,
irq_ret);
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2,
"SNID - device %04X,"
" start_io() reports rc : %d, retrying ...\n",
ioinfo[irq]->schib.pmcw.dev,
irq_ret);
retry--;
irq_ret = -EIO;
}
else // -ENODEV ...
{
retry = 0;
irq_ret = -ENODEV;
} /* endif */
} while ( retry > 0 );
if ( init_IRQ_complete )
{
kfree( snid_ccw );
}
else
{
free_bootmem( (unsigned long)snid_ccw, sizeof(ccw1_t) );
} /* endif */
s390irq_spin_unlock_irqrestore( irq, flags);
/*
* If we installed the irq action handler we have to
* release it too.
*/
if ( inlreq )
free_irq( irq, pdevstat);
} /* endif */
return( irq_ret );
}
/*
* s390_do_crw_pending
*
* Called by the machine check handler to process CRW pending
* conditions. It may be a single CRW, or CRWs may be chained.
*
* Note : we currently process CRWs for subchannel source only
*/
void s390_do_crw_pending( crwe_t *pcrwe )
{
int irq;
int chpid;
int dev_oper = 0;
int dev_no = -1;
int lock = 0;
#ifdef CONFIG_DEBUG_CRW
printk( KERN_DEBUG "do_crw_pending : starting ...\n");
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_crw_id, 2,
"do_crw_pending: starting\n");
while ( pcrwe != NULL )
{
int is_owned = 0;
switch ( pcrwe->crw.rsc ) {
case CRW_RSC_SCH :
irq = pcrwe->crw.rsid;
#ifdef CONFIG_DEBUG_CRW
printk( KERN_NOTICE"do_crw_pending : source is "
"subchannel %04X\n", irq);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_crw_id, 2,
"source is subchannel %04X\n", irq);
/*
* If the device isn't known yet
* we can't lock it ...
*/
if ( ioinfo[irq] != INVALID_STORAGE_AREA )
{
s390irq_spin_lock( irq );
lock = 1;
dev_oper = ioinfo[irq]->ui.flags.oper;
if ( ioinfo[irq]->ui.flags.dval )
dev_no = ioinfo[irq]->devno;
is_owned = ioinfo[irq]->ui.flags.ready;
} /* endif */
#ifdef CONFIG_DEBUG_CRW
printk( KERN_DEBUG "do_crw_pending : subchannel validation - start ...\n");
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_crw_id, 4,
"subchannel validation - start\n");
s390_validate_subchannel( irq, is_owned );
if ( irq > highest_subchannel )
highest_subchannel = irq;
#ifdef CONFIG_DEBUG_CRW
printk( KERN_DEBUG "do_crw_pending : subchannel validation - done\n");
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_crw_id, 4,
"subchannel validation - done\n");
/*
* After the validate processing
* the ioinfo control block
* should be allocated ...
*/
if ( lock )
{
s390irq_spin_unlock( irq );
} /* endif */
if ( ioinfo[irq] != INVALID_STORAGE_AREA )
{
#ifdef CONFIG_DEBUG_CRW
printk( KERN_DEBUG "do_crw_pending : ioinfo at "
#ifdef CONFIG_ARCH_S390X
"%08lX\n",
(unsigned long)ioinfo[irq]);
#else /* CONFIG_ARCH_S390X */
"%08X\n",
(unsigned)ioinfo[irq]);
#endif /* CONFIG_ARCH_S390X */
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_crw_id, 4,
"ioinfo at "
#ifdef CONFIG_ARCH_S390X
"%08lX\n",
(unsigned long)ioinfo[irq]);
#else /* CONFIG_ARCH_S390X */
"%08X\n",
(unsigned)ioinfo[irq]);
#endif /* CONFIG_ARCH_S390X */
} /* endif */
if ( ioinfo[irq] != INVALID_STORAGE_AREA )
{
if ( ioinfo[irq]->ui.flags.oper == 0 )
{
not_oper_handler_func_t nopfunc=ioinfo[irq]->nopfunc;
#ifdef CONFIG_PROC_FS
/* remove procfs entry */
if (cio_proc_devinfo)
cio_procfs_device_remove(dev_no);
#endif
/*
* If the device has gone
* call not oper handler
*/
if (( dev_oper == 1 )
&& ( nopfunc != NULL))
{
free_irq( irq,ioinfo[irq]->irq_desc.dev_id );
nopfunc( irq,DEVSTAT_DEVICE_GONE );
} /* endif */
}
else
{
#ifdef CONFIG_DEBUG_CRW
printk( KERN_DEBUG "do_crw_pending : device "
"recognition - start ...\n");
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_crw_id, 4,
"device recognition - start\n");
s390_device_recognition_irq( irq );
#ifdef CONFIG_DEBUG_CRW
printk( KERN_DEBUG "do_crw_pending : device "
"recognition - done\n");
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_crw_id, 4,
"device recognition - done\n");
/*
* the device became operational
*/
if ( dev_oper == 0 )
{
devreg_t *pdevreg;
pdevreg = s390_search_devreg( ioinfo[irq] );
if ( pdevreg != NULL )
{
if ( pdevreg->oper_func != NULL )
pdevreg->oper_func( irq, pdevreg );
} /* endif */
#ifdef CONFIG_PROC_FS
/* add new procfs entry */
if (cio_proc_devinfo)
if (highest_subchannel < MAX_CIO_PROCFS_ENTRIES) {
cio_procfs_device_create(ioinfo[irq]->devno);
}
#endif
}
/*
* ... it is and was operational, but
* the devno may have changed
*/
else if ((ioinfo[irq]->devno != dev_no) && ( ioinfo[irq]->nopfunc != NULL ))
{
#ifdef CONFIG_PROC_FS
int devno_old = ioinfo[irq]->devno;
#endif
ioinfo[irq]->nopfunc( irq,
DEVSTAT_REVALIDATE );
#ifdef CONFIG_PROC_FS
/* remove old entry, add new */
if (cio_proc_devinfo) {
cio_procfs_device_remove(devno_old);
cio_procfs_device_create(ioinfo[irq]->devno);
}
#endif
} /* endif */
} /* endif */
#ifdef CONFIG_PROC_FS
/* get rid of dead procfs entries */
if (cio_proc_devinfo)
cio_procfs_device_purge();
#endif
} /* endif */
break;
case CRW_RSC_MONITOR :
#ifdef CONFIG_DEBUG_CRW
printk( KERN_NOTICE "do_crw_pending : source is "
"monitoring facility\n");
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_crw_id, 2,
"source is monitoring facility\n");
break;
case CRW_RSC_CPATH :
chpid = pcrwe->crw.rsid;
#ifdef CONFIG_DEBUG_CRW
printk( KERN_NOTICE "do_crw_pending : source is "
"channel path %02X\n", chpid);
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_crw_id, 2,
"source is channel path %02X\n");
break;
case CRW_RSC_CONFIG :
#ifdef CONFIG_DEBUG_CRW
printk( KERN_NOTICE "do_crw_pending : source is "
"configuration-alert facility\n");
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_crw_id, 2,
"source is configuration-alert facility\n");
break;
case CRW_RSC_CSS :
#ifdef CONFIG_DEBUG_CRW
printk( KERN_NOTICE "do_crw_pending : source is "
"channel subsystem\n");
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_crw_id, 2,
"source is channel subsystem\n");
break;
default :
#ifdef CONFIG_DEBUG_CRW
printk( KERN_NOTICE "do_crw_pending : unknown source\n");
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_crw_id, 2,
"unknown source\n");
break;
} /* endswitch */
pcrwe = pcrwe->crwe_next;
} /* endwhile */
#ifdef CONFIG_DEBUG_CRW
printk( KERN_DEBUG "do_crw_pending : done\n");
#endif
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_crw_id, 2,
"do_crw_pending: done\n");
return;
}
/* added by Holger Smolinski for reipl support in reipl.S */
extern void do_reipl (int);
void
reipl ( int sch )
{
int i;
s390_dev_info_t dev_info;
for ( i = 0; i <= highest_subchannel; i ++ )
{
if ( get_dev_info_by_irq( i, &dev_info ) == 0
&& (dev_info.status & DEVSTAT_DEVICE_OWNED) )
{
free_irq ( i, ioinfo[i]->irq_desc.dev_id );
}
}
if (MACHINE_IS_VM)
cpcmd("IPL", NULL, 0);
else
do_reipl( 0x10000 | sch );
}
/*
* Function: cio_debug_init
* Initializes three debug logs (under /proc/s390dbf) for common I/O:
* - cio_msg logs the messages which are printk'ed when CONFIG_DEBUG_IO is on
* - cio_trace logs the calling of different functions
* - cio_crw logs the messages which are printk'ed when CONFIG_DEBUG_CRW is on
* debug levels depend on CONFIG_DEBUG_IO resp. CONFIG_DEBUG_CRW
*/
int cio_debug_init( void )
{
int ret = 0;
cio_debug_msg_id = debug_register("cio_msg",4,4,16*sizeof(long));
if (cio_debug_msg_id != NULL) {
debug_register_view(cio_debug_msg_id, &debug_sprintf_view);
#ifdef CONFIG_DEBUG_IO
debug_set_level(cio_debug_msg_id, 6);
#else /* CONFIG_DEBUG_IO */
debug_set_level(cio_debug_msg_id, 2);
#endif /* CONFIG_DEBUG_IO */
} else {
ret = -1;
}
cio_debug_trace_id = debug_register("cio_trace",4,4,8);
if (cio_debug_trace_id != NULL) {
debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view);
#ifdef CONFIG_DEBUG_IO
debug_set_level(cio_debug_trace_id, 6);
#else /* CONFIG_DEBUG_IO */
debug_set_level(cio_debug_trace_id, 2);
#endif /* CONFIG_DEBUG_IO */
} else {
ret = -1;
}
cio_debug_crw_id = debug_register("cio_crw",2,4,16*sizeof(long));
if (cio_debug_crw_id != NULL) {
debug_register_view(cio_debug_crw_id, &debug_sprintf_view);
#ifdef CONFIG_DEBUG_CRW
debug_set_level(cio_debug_crw_id, 6);
#else /* CONFIG_DEBUG_CRW */
debug_set_level(cio_debug_crw_id, 2);
#endif /* CONFIG_DEBUG_CRW */
} else {
ret = -1;
}
if (ret)
return ret;
cio_debug_initialized = 1;
return 0;
}
__initcall(cio_debug_init);
#ifdef CONFIG_PROC_FS
/*
* Display info on subchannels in /proc/subchannels.
* Adapted from procfs stuff in dasd.c by Cornelia Huck, 02/28/01.
*/
typedef struct {
char *data;
int len;
} tempinfo_t;
#define MIN(a,b) ((a)<(b)?(a):(b))
static struct proc_dir_entry *chan_subch_entry;
static int chan_subch_open( struct inode *inode, struct file *file)
{
int rc = 0;
int size = 1;
int len = 0;
int i = 0;
int j = 0;
tempinfo_t *info;
info = (tempinfo_t *) vmalloc( sizeof (tempinfo_t));
if (info == NULL) {
printk( KERN_WARNING "No memory available for data\n");
return -ENOMEM;
} else {
file->private_data = ( void * ) info;
}
size += (highest_subchannel+1) * 128;
info->data = (char *) vmalloc( size );
if (size && info->data == NULL) {
printk (KERN_WARNING "No memory available for data\n");
vfree (info);
return -ENOMEM;
}
len += sprintf( info->data+len,
"Device sch. Dev Type/Model CU in use PIM PAM POM LPUM CHPIDs\n");
len += sprintf( info->data+len,
"--------------------------------------------------------------------------\n");
for ( i=0; i <= highest_subchannel; i++) {
if ( !((ioinfo[i] == NULL) || (ioinfo[i] == INVALID_STORAGE_AREA) || !(ioinfo[i]->ui.flags.oper)) ) {
len += sprintf( info->data+len,
"%04X %04X ",
ioinfo[i]->schib.pmcw.dev,
i );
if ( ioinfo[i]->senseid.dev_type != 0 ) {
len += sprintf( info->data+len,
"%04X/%02X %04X/%02X",
ioinfo[i]->senseid.dev_type,
ioinfo[i]->senseid.dev_model,
ioinfo[i]->senseid.cu_type,
ioinfo[i]->senseid.cu_model );
} else {
len += sprintf( info->data+len,
" %04X/%02X",
ioinfo[i]->senseid.cu_type,
ioinfo[i]->senseid.cu_model );
}
if (ioinfo[i]->ui.flags.ready) {
len += sprintf( info->data+len, " yes " );
} else {
len += sprintf( info->data+len, " " );
}
len += sprintf( info->data+len,
" %02X %02X %02X %02X ",
ioinfo[i]->schib.pmcw.pim,
ioinfo[i]->schib.pmcw.pam,
ioinfo[i]->schib.pmcw.pom,
ioinfo[i]->schib.pmcw.lpum );
for ( j=0; j < 8; j++ ) {
len += sprintf( info->data+len,
"%02X",
ioinfo[i]->schib.pmcw.chpid[j] );
if (j==3) {
len += sprintf( info->data+len, " " );
}
}
len += sprintf( info->data+len, "\n" );
}
}
info->len = len;
return rc;
}
static int chan_subch_close( struct inode *inode, struct file *file)
{
int rc = 0;
tempinfo_t *p_info = (tempinfo_t *) file->private_data;
if (p_info) {
if (p_info->data)
vfree( p_info->data );
vfree( p_info );
}
return rc;
}
static ssize_t chan_subch_read( struct file *file, char *user_buf, size_t user_len, loff_t * offset)
{
loff_t len;
tempinfo_t *p_info = (tempinfo_t *) file->private_data;
if ( *offset>=p_info->len) {
return 0;
} else {
len = MIN(user_len, (p_info->len - *offset));
if (copy_to_user( user_buf, &(p_info->data[*offset]), len))
return -EFAULT;
(* offset) += len;
return len;
}
}
static struct file_operations chan_subch_file_ops =
{
read:chan_subch_read,
open:chan_subch_open,
release:chan_subch_close,
};
static int chan_proc_init( void )
{
chan_subch_entry = create_proc_entry( "subchannels", S_IFREG|S_IRUGO, &proc_root);
chan_subch_entry->proc_fops = &chan_subch_file_ops;
return 1;
}
__initcall(chan_proc_init);
void chan_proc_cleanup( void )
{
remove_proc_entry( "subchannels", &proc_root);
}
/*
* Display device specific information under /proc/deviceinfo/<devno>
*/
static struct proc_dir_entry *cio_procfs_deviceinfo_root = NULL;
/*
* cio_procfs_device_list holds all devno-specific procfs directories
*/
typedef struct {
int devno;
struct proc_dir_entry *cio_device_entry;
struct proc_dir_entry *cio_sensedata_entry;
struct proc_dir_entry *cio_in_use_entry;
struct proc_dir_entry *cio_chpid_entry;
} cio_procfs_entry_t;
typedef struct _cio_procfs_device{
struct _cio_procfs_device *next;
cio_procfs_entry_t *entry;
} cio_procfs_device_t;
cio_procfs_device_t *cio_procfs_device_list = NULL;
/*
* File operations
*/
static int cio_device_entry_close( struct inode *inode, struct file *file)
{
int rc = 0;
tempinfo_t *p_info = (tempinfo_t *) file->private_data;
if (p_info) {
if (p_info->data)
vfree( p_info->data );
vfree( p_info );
}
return rc;
}
static ssize_t cio_device_entry_read( struct file *file, char *user_buf, size_t user_len, loff_t * offset)
{
loff_t len;
tempinfo_t *p_info = (tempinfo_t *) file->private_data;
if ( *offset>=p_info->len) {
return 0;
} else {
len = MIN(user_len, (p_info->len - *offset));
if (copy_to_user( user_buf, &(p_info->data[*offset]), len))
return -EFAULT;
(* offset) += len;
return len;
}
}
static int cio_sensedata_entry_open( struct inode *inode, struct file *file)
{
int rc = 0;
int size = 1;
int len = 0;
tempinfo_t *info;
int irq;
int devno;
char * devno_str;
info = (tempinfo_t *) vmalloc(sizeof(tempinfo_t));
if (info == NULL) {
printk( KERN_WARNING "No memory available for data\n");
rc = -ENOMEM;
} else {
file->private_data = (void *) info;
size += 2 * 32;
info->data = (char *) vmalloc(size);
if (size && info->data == NULL) {
printk(KERN_WARNING "No memory available for data\n");
vfree(info);
rc = -ENOMEM;
} else {
devno_str = kmalloc(6*sizeof(char), GFP_KERNEL);
memset(devno_str, 0, 6*sizeof(char));
memcpy(devno_str,file->f_dentry->d_parent->d_name.name, strlen(file->f_dentry->d_parent->d_name.name)+1);
devno = simple_strtoul(devno_str, &devno_str, 16);
irq = get_irq_by_devno(devno);
if (irq != -1) {
len += sprintf(info->data+len, "Dev Type/Mod: ");
if (ioinfo[irq]->senseid.dev_type == 0) {
len += sprintf(info->data+len, "%04X/%02X\n",
ioinfo[irq]->senseid.cu_type,
ioinfo[irq]->senseid.cu_model);
} else {
len += sprintf(info->data+len, "%04X/%02X\n",
ioinfo[irq]->senseid.dev_type,
ioinfo[irq]->senseid.dev_model);
len+= sprintf(info->data+len, "CU Type/Mod: %04X/%02X\n",
ioinfo[irq]->senseid.cu_type,
ioinfo[irq]->senseid.cu_model);
}
}
info->len = len;
}
}
return rc;
}
static int cio_in_use_entry_open( struct inode *inode, struct file *file)
{
int rc = 0;
int size = 1;
int len = 0;
tempinfo_t *info;
int irq;
int devno;
char * devno_str;
info = (tempinfo_t *) vmalloc(sizeof(tempinfo_t));
if (info == NULL) {
printk( KERN_WARNING "No memory available for data\n");
rc = -ENOMEM;
} else {
file->private_data = (void *) info;
size += 8;
info->data = (char *) vmalloc(size);
if (size && info->data == NULL) {
printk(KERN_WARNING "No memory available for data\n");
vfree(info);
rc = -ENOMEM;
} else {
devno_str = kmalloc(6*sizeof(char), GFP_KERNEL);
memset(devno_str, 0, 6*sizeof(char));
memcpy(devno_str,file->f_dentry->d_parent->d_name.name, strlen(file->f_dentry->d_parent->d_name.name)+1);
devno = simple_strtoul(devno_str, &devno_str, 16);
irq = get_irq_by_devno(devno);
if (irq != -1) {
len += sprintf(info->data+len, "%s\n", ioinfo[irq]->ui.flags.ready?"yes":"no");
}
info->len = len;
}
}
return rc;
}
static int cio_chpid_entry_open( struct inode *inode, struct file *file)
{
int rc = 0;
int size = 1;
int len = 0;
tempinfo_t *info;
int irq;
int devno;
int i;
char * devno_str;
info = (tempinfo_t *) vmalloc(sizeof(tempinfo_t));
if (info == NULL) {
printk( KERN_WARNING "No memory available for data\n");
rc = -ENOMEM;
} else {
file->private_data = (void *) info;
size += 8*16;
info->data = (char *) vmalloc(size);
if (size && info->data == NULL) {
printk(KERN_WARNING "No memory available for data\n");
vfree(info);
rc = -ENOMEM;
} else {
devno_str = kmalloc(6*sizeof(char), GFP_KERNEL);
memset(devno_str, 0, 6*sizeof(char));
memcpy(devno_str,file->f_dentry->d_parent->d_name.name, strlen(file->f_dentry->d_parent->d_name.name)+1);
devno = simple_strtoul(devno_str, &devno_str, 16);
irq = get_irq_by_devno(devno);
if (irq != -1) {
for (i=0; i<8; i++) {
len += sprintf(info->data+len, "CHPID[%d]: ", i);
len += sprintf(info->data+len, "%02X\n", ioinfo[irq]->schib.pmcw.chpid[i]);
}
}
info->len = len;
}
}
return rc;
}
static struct file_operations cio_sensedata_entry_file_ops =
{
read:cio_device_entry_read,
open:cio_sensedata_entry_open,
release:cio_device_entry_close,
};
static struct file_operations cio_in_use_entry_file_ops =
{
read:cio_device_entry_read,
open:cio_in_use_entry_open,
release:cio_device_entry_close,
};
static struct file_operations cio_chpid_entry_file_ops =
{
read:cio_device_entry_read,
open:cio_chpid_entry_open,
release:cio_device_entry_close,
};
/*
* Function: cio_procfs_device_create
* create procfs entry for given device number
* and insert it into list
*/
int cio_procfs_device_create(int devno)
{
cio_procfs_entry_t *entry;
cio_procfs_device_t *tmp;
cio_procfs_device_t *where;
char buf[8];
int i;
int rc = 0;
/* create the directory entry */
entry = (cio_procfs_entry_t *)kmalloc(sizeof(cio_procfs_entry_t), GFP_KERNEL);
if (entry) {
entry->devno = devno;
sprintf(buf, "%x", devno);
entry->cio_device_entry = proc_mkdir(buf, cio_procfs_deviceinfo_root);
if (entry->cio_device_entry) {
tmp = (cio_procfs_device_t *)kmalloc(sizeof(cio_procfs_device_t), GFP_KERNEL);
if (tmp) {
tmp->entry = entry;
if (cio_procfs_device_list == NULL) {
cio_procfs_device_list = tmp;
tmp->next = NULL;
} else {
where = cio_procfs_device_list;
i = where->entry->devno;
while ((devno>i) && (where->next != NULL)) {
where = where->next;
i = where->entry->devno;
}
if (where->next == NULL) {
where->next = tmp;
tmp->next = NULL;
} else {
tmp->next = where->next;
where->next = tmp;
}
}
/* create the different entries */
entry->cio_sensedata_entry = create_proc_entry( "sensedata", S_IFREG|S_IRUGO, entry->cio_device_entry);
entry->cio_sensedata_entry->proc_fops = &cio_sensedata_entry_file_ops;
entry->cio_in_use_entry = create_proc_entry( "in_use", S_IFREG|S_IRUGO, entry->cio_device_entry);
entry->cio_in_use_entry->proc_fops = &cio_in_use_entry_file_ops;
entry->cio_chpid_entry = create_proc_entry( "chpids", S_IFREG|S_IRUGO, entry->cio_device_entry);
entry->cio_chpid_entry->proc_fops = &cio_chpid_entry_file_ops;
} else {
printk( KERN_WARNING "Error, could not allocate procfs structure!\n");
remove_proc_entry(buf, cio_procfs_deviceinfo_root);
kfree(entry);
rc = -ENOMEM;
}
} else {
printk( KERN_WARNING "Error, could not allocate procfs structure!\n");
kfree(entry);
rc = -ENOMEM;
}
} else {
printk( KERN_WARNING "Error, could not allocate procfs structure!\n");
rc = -ENOMEM;
}
return rc;
}
/*
* Function: cio_procfs_device_remove
* remove procfs entry for given device number
*/
int cio_procfs_device_remove(int devno)
{
int rc = 0;
cio_procfs_device_t *tmp;
cio_procfs_device_t *prev = NULL;
tmp=cio_procfs_device_list;
while (tmp) {
if (tmp->entry->devno == devno)
break;
prev = tmp;
tmp = tmp->next;
}
if (tmp) {
char buf[8];
remove_proc_entry("sensedata", tmp->entry->cio_device_entry);
remove_proc_entry("in_use", tmp->entry->cio_device_entry);
remove_proc_entry("chpid", tmp->entry->cio_device_entry);
sprintf(buf, "%x", devno);
remove_proc_entry(buf, cio_procfs_deviceinfo_root);
if (tmp == cio_procfs_device_list) {
cio_procfs_device_list = tmp->next;
} else {
prev->next = tmp->next;
}
kfree(tmp->entry);
kfree(tmp);
} else {
rc = -ENODEV;
}
return rc;
}
/*
* Function: cio_procfs_purge
* purge /proc/deviceinfo of entries for gone devices
*/
int cio_procfs_device_purge(void)
{
int i;
for (i=0; i<=highest_subchannel; i++) {
if (ioinfo[i] != INVALID_STORAGE_AREA) {
if (!ioinfo[i]->ui.flags.oper)
cio_procfs_device_remove(ioinfo[i]->devno);
}
}
return 0;
}
/*
* Function: cio_procfs_create
* create /proc/deviceinfo/ and subdirs for the devices
*/
static int cio_procfs_create( void )
{
int irq;
if (cio_proc_devinfo) {
cio_procfs_deviceinfo_root = proc_mkdir( "deviceinfo", &proc_root);
if (highest_subchannel >= MAX_CIO_PROCFS_ENTRIES) {
printk(KERN_ALERT "Warning: Not enough inodes for creating all entries under /proc/deviceinfo/. "
"Not every device will get an entry.\n");
}
for (irq=0; irq<=highest_subchannel; irq++) {
if (irq >= MAX_CIO_PROCFS_ENTRIES)
break;
if (ioinfo[irq] != INVALID_STORAGE_AREA) {
if (ioinfo[irq]->ui.flags.oper)
if (cio_procfs_device_create(ioinfo[irq]->devno) == -ENOMEM) {
printk(KERN_CRIT "Out of memory while creating entries in /proc/deviceinfo/, "
"not all devices might show up\n");
break;
}
}
}
}
return 1;
}
__initcall(cio_procfs_create);
/*
* Entry /proc/cio_ignore to display blacklisted ranges of devices.
* un-ignore devices by piping to /proc/cio_ignore:
* free all frees all blacklisted devices, free <range>,<range>,...
* frees specified ranges of devnos
* add <range>,<range>,... will add a range of devices to blacklist -
* but only for devices not already known
*/
static struct proc_dir_entry *cio_ignore_proc_entry;
static int cio_ignore_proc_open(struct inode *inode, struct file *file)
{
int rc = 0;
int size = 1;
int len = 0;
tempinfo_t *info;
long flags;
int i, j;
info = (tempinfo_t *) vmalloc(sizeof(tempinfo_t));
if (info == NULL) {
printk( KERN_WARNING "No memory available for data\n");
rc = -ENOMEM;
} else {
file->private_data = (void *) info;
size += nr_ignored * 6;
info->data = (char *) vmalloc(size);
if (size && info->data == NULL) {
printk( KERN_WARNING "No memory available for data\n");
vfree (info);
rc = -ENOMEM;
} else {
spin_lock_irqsave( &blacklist_lock, flags );
for (i=0;i<=highest_ignored;i++)
if (test_bit(i,&bl_dev)) {
len += sprintf(info->data+len, "%04x ", i);
for (j=i;(j<=highest_ignored) && (test_bit(j,&bl_dev));j++);
j--;
if (i != j)
len += sprintf(info->data+len, "- %04x", j);
len += sprintf(info->data+len, "\n");
i=j;
}
spin_unlock_irqrestore( &blacklist_lock, flags );
info->len = len;
}
}
return rc;
}
static int cio_ignore_proc_close(struct inode *inode, struct file *file)
{
int rc = 0;
tempinfo_t *p_info = (tempinfo_t *) file->private_data;
if (p_info) {
if (p_info->data)
vfree( p_info->data );
vfree( p_info );
}
return rc;
}
static ssize_t cio_ignore_proc_read( struct file *file, char *user_buf, size_t user_len, loff_t * offset)
{
loff_t len;
tempinfo_t *p_info = (tempinfo_t *) file->private_data;
if ( *offset>=p_info->len) {
return 0;
} else {
len = MIN(user_len, (p_info->len - *offset));
if (copy_to_user( user_buf, &(p_info->data[*offset]), len))
return -EFAULT;
(* offset) += len;
return len;
}
}
static ssize_t cio_ignore_proc_write (struct file *file, const char *user_buf,
size_t user_len, loff_t * offset)
{
char *buffer = vmalloc (user_len);
if (buffer == NULL)
return -ENOMEM;
if (copy_from_user (buffer, user_buf, user_len)) {
vfree (buffer);
return -EFAULT;
}
buffer[user_len]='\0';
#ifdef CIO_DEBUG_IO
printk ( KERN_DEBUG "/proc/cio_ignore: '%s'\n", buffer);
#endif /* CIO_DEBUG_IO */
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id, 2, "/proc/cio_ignore: '%s'\n",buffer);
blacklist_parse_proc_parameters(buffer);
return user_len;
}
static struct file_operations cio_ignore_proc_file_ops =
{
read:cio_ignore_proc_read,
open:cio_ignore_proc_open,
write:cio_ignore_proc_write,
release:cio_ignore_proc_close,
};
static int cio_ignore_proc_init(void)
{
cio_ignore_proc_entry = create_proc_entry("cio_ignore", S_IFREG|S_IRUGO|S_IWUSR, &proc_root);
cio_ignore_proc_entry->proc_fops = &cio_ignore_proc_file_ops;
return 1;
}
__initcall(cio_ignore_proc_init);
/*
* Entry /proc/irq_count
* display how many irqs have occured per cpu...
*/
static struct proc_dir_entry *cio_irq_proc_entry;
static int cio_irq_proc_open(struct inode *inode, struct file *file)
{
int rc = 0;
int size = 1;
int len = 0;
tempinfo_t *info;
int i;
info = (tempinfo_t *) vmalloc(sizeof(tempinfo_t));
if (info == NULL) {
printk( KERN_WARNING "No memory available for data\n");
rc = -ENOMEM;
} else {
file->private_data = (void *) info;
size += NR_CPUS * 16;
info->data = (char *) vmalloc(size);
if (size && info->data == NULL) {
printk( KERN_WARNING "No memory available for data\n");
vfree (info);
rc = -ENOMEM;
} else {
for (i=0; i< NR_CPUS; i++) {
if (s390_irq_count[i] != 0)
len += sprintf(info->data+len, "%lx\n", s390_irq_count[i]);
}
info->len = len;
}
}
return rc;
}
static int cio_irq_proc_close(struct inode *inode, struct file *file)
{
int rc = 0;
tempinfo_t *p_info = (tempinfo_t *) file->private_data;
if (p_info) {
if (p_info->data)
vfree(p_info->data);
vfree(p_info);
}
return rc;
}
static ssize_t cio_irq_proc_read( struct file *file, char *user_buf, size_t user_len, loff_t * offset)
{
loff_t len;
tempinfo_t *p_info = (tempinfo_t *) file->private_data;
if ( *offset>=p_info->len) {
return 0;
} else {
len = MIN(user_len, (p_info->len - *offset));
if (copy_to_user( user_buf, &(p_info->data[*offset]), len))
return -EFAULT;
(* offset) += len;
return len;
}
}
static struct file_operations cio_irq_proc_file_ops =
{
read: cio_irq_proc_read,
open: cio_irq_proc_open,
release: cio_irq_proc_close,
};
static int cio_irq_proc_init(void)
{
int i;
if (cio_count_irqs) {
for (i=0; i<NR_CPUS; i++)
s390_irq_count[i]=0;
cio_irq_proc_entry = create_proc_entry("irq_count", S_IFREG|S_IRUGO, &proc_root);
cio_irq_proc_entry->proc_fops = &cio_irq_proc_file_ops;
}
return 1;
}
__initcall(cio_irq_proc_init);
/* end of procfs stuff */
#endif
schib_t *s390_get_schib( int irq )
{
if ( (irq > highest_subchannel) || (irq < 0) )
return NULL;
if ( ioinfo[irq] == INVALID_STORAGE_AREA )
return NULL;
return &ioinfo[irq]->schib;
}
EXPORT_SYMBOL(halt_IO);
EXPORT_SYMBOL(clear_IO);
EXPORT_SYMBOL(do_IO);
EXPORT_SYMBOL(resume_IO);
EXPORT_SYMBOL(ioinfo);
EXPORT_SYMBOL(get_dev_info_by_irq);
EXPORT_SYMBOL(get_dev_info_by_devno);
EXPORT_SYMBOL(get_irq_by_devno);
EXPORT_SYMBOL(get_devno_by_irq);
EXPORT_SYMBOL(get_irq_first);
EXPORT_SYMBOL(get_irq_next);
EXPORT_SYMBOL(read_conf_data);
EXPORT_SYMBOL(read_dev_chars);
EXPORT_SYMBOL(s390_request_irq_special);
EXPORT_SYMBOL(s390_get_schib);
EXPORT_SYMBOL(s390_register_adapter_interrupt);
EXPORT_SYMBOL(s390_unregister_adapter_interrupt);
|