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Unix_Linux

s390io.c：源码内容

/*
* drivers/s390/s390io.c
* S/390 common I/O routines
* $Revision: 1.171.2.21 $
*
* S390 version
* 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
* 10/15/2001 Cornelia Huck xsch - internal only for now
* 10/29/2001 Cornelia Huck Blacklisting reworked again
* 10/29/2001 Cornelia Huck improved utilization of debug feature
* 10/29/2001 Cornelia Huck more work on cancel_IO - use the flag
* DOIO_CANCEL_ON_TIMEOUT in do_IO to get
* io cancelled
* 11/15/2001 Cornelia Huck proper behaviour with procfs off
* 12/10/2001 Cornelia Huck added private_data + functions to
* ioinfo_t
* 11-12/2001 Cornelia Huck various cleanups
* 01/09/2002 Cornelia Huck PGID fixes
* process css machine checks
* 01/10/2002 Cornelia Huck added /proc/chpids
* 04/10/2002 Cornelia Huck fixed reaction on css machine checks
* 04/23/2002 Cornelia Huck fixed console isc (un)setting
* 06/06/2002 Cornelia Huck added detection of locked devices
*/
#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);
if (ioinfo[irq]->st)
return -ENODEV;
} while(0)
#define CIO_TRACE_EVENT(imp, txt) do {
if (cio_debug_initialized)
debug_text_event(cio_debug_trace_id,
imp,
txt);
}while (0)
#define CIO_MSG_EVENT(imp, args...) do {
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_msg_id,
imp,
##args);
} while (0)
#define CIO_CRW_EVENT(imp, args...) do {
if (cio_debug_initialized)
debug_sprintf_event(cio_debug_crw_id,
imp,
##args);
} while (0)
#undef CONFIG_DEBUG_IO
#define CONFIG_DEBUG_CRW
#define CONFIG_DEBUG_CHSC
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
};
#ifdef CONFIG_CHSC
__u64 chpids[4] = {0,0,0,0};
__u64 chpids_logical[4] = {-1,-1,-1,-1};
__u64 chpids_known[4] = {0,0,0,0};
#endif /* CONFIG_CHSC */
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 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;
static pgid_t * global_pgid;
/* 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;
#ifdef CONFIG_CHSC
int cio_chsc_desc_avail = 0;
int cio_chsc_err_msg = 0;
#endif
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);
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);
int cancel_IO (int irq);
int s390_start_IO (int irq, ccw1_t * cpa, unsigned long user_intparm,
__u8 lpm, unsigned long flag);
static int s390_send_nop(int irq, __u8 lpm);
#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_CHSC
static chsc_area_t *chsc_area_ssd = NULL;
static chsc_area_t *chsc_area_sei = NULL;
static spinlock_t chsc_lock_ssd = SPIN_LOCK_UNLOCKED;
static spinlock_t chsc_lock_sei = SPIN_LOCK_UNLOCKED;
static int chsc_get_sch_descriptions( void );
int s390_vary_chpid( __u8 chpid, int on );
#endif
#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... */
int cio_sid_with_pgid = 0; /* if we need a PGID for SenseID, switch this on */
/*
* "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 u32 bl_dev[2048];
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))
|| (to<0) || (to > 0xffff)
|| (from<0) || (from > 0xffff)) {
printk (KERN_WARNING
"Invalid blacklist range %x to %x, skippingn", 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;
if ((to<0) || (to > 0xffff)
|| (from<0) || (from > 0xffff)) {
printk (KERN_WARNING
"Invalid blacklist range %x to %x, "
"not freeingn",
from, to);
return;
}
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 = '';
end++;
}
blacklist[count] = alloc_bootmem (len * sizeof (char));
if (blacklist == NULL) {
printk (KERN_WARNING
"can't store cio_ignore= parameter no %dn",
count + 1);
break;
}
memset (blacklist[count], 0, len * sizeof (char));
memcpy (blacklist[count], tmp, len * sizeof (char));
count++;
tmp = end;
} while (tmp != NULL && *tmp != '');
}
/*
* 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 %Xn", from,
to);
#endif
str++;
}
}
/*
* Initialisation of blacklist
*/
void __init
blacklist_init (void)
{
#ifdef CONFIG_DEBUG_IO
printk (KERN_DEBUG "Reading blacklist...n");
#endif
CIO_MSG_EVENT(6, "Reading blacklistn");
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
CIO_MSG_EVENT(6, "Reading blacklist parametersn");
blacklist_setup (str, &dummy);
/* Blacklist ranges must be ready when device recognition starts */
blacklist_init ();
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 = '';
end++;
}
param =
(char *) kmalloc (len * sizeof (char) + 1,
GFP_KERNEL);
strncpy (param, (const char *) tmp, len);
tmp = end;
from = blacklist_strtoul (param, &param);
if (*param == '-') {
param++;
to = blacklist_strtoul (param, &param);
} 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 = '';
end++;
}
param =
(char *) kmalloc (len * sizeof (char) + 1,
GFP_KERNEL);
strncpy (param, (const char *) tmp, len);
tmp = end;
from = blacklist_strtoul (param, &param);
if (*param == '-') {
param++;
to = blacklist_strtoul (param, &param);
} 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]->st)
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 %xn",
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%sn", 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_text_event (cio_debug_msg_id, level, 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_text_event (cio_debug_msg_id, level, 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);
}
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
static int __init
cio_pgid_setup (char *parm)
{
if (!strcmp (parm, "yes")) {
cio_sid_with_pgid = 1;
} else if (!strcmp (parm, "no")) {
cio_sid_with_pgid = 0;
} else {
printk (KERN_ERR
"cio_pgid_setup : invalid cio_msg parameter '%s'",
parm);
}
return 1;
}
__setup ("cio_sid_with_pgid=", cio_pgid_setup);
/*
* 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];
CIO_TRACE_EVENT (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);
sprintf (dbf_txt, "ret:%d", ret);
CIO_TRACE_EVENT (4, dbf_txt);
return (ret);
}
int
s390_unregister_adapter_interrupt (adapter_int_handler_t handler)
{
int ret = 0;
char dbf_txt[15];
CIO_TRACE_EVENT (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);
sprintf (dbf_txt, "ret:%d", ret);
CIO_TRACE_EVENT (4, dbf_txt);
return (ret);
}
static inline void
do_adapter_IO (__u32 intparm)
{
CIO_TRACE_EVENT (4, "doaio");
spin_lock (&adapter_lock);
if (adapter_handler)
(*adapter_handler) (intparm);
spin_unlock (&adapter_lock);
return;
}
/*
* Function: s390_send_nop
*
* sends a nop CCW to the specified subchannel down the given path(s)
*/
static int
s390_send_nop(int irq, __u8 lpm)
{
char dbf_txt[15];
ccw1_t *nop_ccw;
devstat_t devstat;
devstat_t *pdevstat = &devstat;
unsigned long flags;
int irq_ret = 0;
int inlreq = 0;
SANITY_CHECK(irq);
if (!ioinfo[irq]->ui.flags.oper)
/* no sense in trying */
return -ENODEV;
sprintf(dbf_txt, "snop%x", irq);
CIO_TRACE_EVENT(5, dbf_txt);
if (!ioinfo[irq]->ui.flags.ready) {
/*
* If there's no handler, use our dummy handler.
*/
irq_ret = request_irq (irq,
init_IRQ_handler,
SA_PROBE,
"SNOP",
pdevstat);
if (!irq_ret)
inlreq = 1;
} else {
pdevstat = ioinfo[irq]->irq_desc.dev_id;
}
if (irq_ret)
return irq_ret;
s390irq_spin_lock_irqsave (irq, flags);
if (init_IRQ_complete)
nop_ccw = kmalloc (sizeof (ccw1_t), GFP_DMA);
else
nop_ccw = alloc_bootmem_low (sizeof (ccw1_t));
nop_ccw->cmd_code = CCW_CMD_NOOP;
nop_ccw->cda = 0;
nop_ccw->count = 0;
nop_ccw->flags = CCW_FLAG_SLI;
memset (pdevstat, '', sizeof (devstat_t));
irq_ret = s390_start_IO (irq, nop_ccw, 0xE2D5D6D7, lpm,
DOIO_WAIT_FOR_INTERRUPT
| DOIO_TIMEOUT
| DOIO_DONT_CALL_INTHDLR
| DOIO_VALID_LPM);
if (irq_ret == -ETIMEDOUT) {
/* better cancel... */
cancel_IO(irq);
}
if (init_IRQ_complete)
kfree (nop_ccw);
else
free_bootmem ((unsigned long) nop_ccw, sizeof (ccw1_t));
s390irq_spin_unlock_irqrestore (irq, flags);
if (inlreq)
free_irq (irq, pdevstat);
return irq_ret;
}
/*
* 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 (ioinfo[irq]->st)
return -ENODEV;
sprintf (dbf_txt, "reqs%x", irq);
CIO_TRACE_EVENT (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;
}
s390irq_spin_unlock_irqrestore (irq, flags);
if (retval == 0) {
if (!(irqflags & SA_PROBE) &&
(!ioinfo[irq]->ui.flags.unfriendly))
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;
}
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 (ioinfo[irq]->st)
return;
sprintf (dbf_txt, "free%x", irq);
CIO_TRACE_EVENT (2, dbf_txt);
s390irq_spin_lock_irqsave (irq, flags);
#ifdef CONFIG_KERNEL_DEBUG
if (irq != cons_dev)
printk (KERN_DEBUG "Trying to free IRQ%dn", irq);
#endif
CIO_MSG_EVENT(2, "Trying to free IRQ %dn", 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;
ret = disable_subchannel (irq);
if (ret == -EBUSY) {
/*
* kill it !
* We try to terminate the I/O by halt_IO first,
* then clear_IO.
* Because the device may be gone (machine
* check handling), we can't use sync I/O.
*/
halt_IO (irq, 0xC8C1D3E3, 0);
s390irq_spin_unlock_irqrestore (irq, flags);
udelay (200000); /* 200 ms */
s390irq_spin_lock_irqsave (irq, flags);
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 exceededn", irq,
ioinfo[irq]->devstat.
devno);
CIO_MSG_EVENT( 0,
"free_irq(%04X) - "
"device %04X busy, "
"retry count exceededn",
irq,
ioinfo[irq]->
devstat.devno);
}
}
}
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);
CIO_MSG_EVENT( 0,
"free_irq(%04X) : error, "
"dev_id does not match !n",
irq);
}
} else {
s390irq_spin_unlock_irqrestore (irq, flags);
printk (KERN_ERR "free_irq(%04X) : error, "
"no action block ... !n", irq);
CIO_MSG_EVENT(0,
"free_irq(%04X) : error, "
"no action block ... !n", irq);
}
}
/*
* 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;
sprintf (dbf_txt, "dirq%x", irq);
CIO_TRACE_EVENT (4, dbf_txt);
s390irq_spin_lock_irqsave (irq, flags);
ret = disable_subchannel (irq);
s390irq_spin_unlock_irqrestore (irq, flags);
synchronize_irq ();
sprintf (dbf_txt, "ret:%d", ret);
CIO_TRACE_EVENT (4, dbf_txt);
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;
sprintf (dbf_txt, "eirq%x", irq);
CIO_TRACE_EVENT (4, dbf_txt);
s390irq_spin_lock_irqsave (irq, flags);
ret = enable_subchannel (irq);
s390irq_spin_unlock_irqrestore (irq, flags);
sprintf (dbf_txt, "ret:%d", ret);
CIO_TRACE_EVENT (4, dbf_txt);
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);
sprintf (dbf_txt, "esch%x", irq);
CIO_TRACE_EVENT (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;
}
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);
}
}
sprintf (dbf_txt, "ret:%d", ret);
CIO_TRACE_EVENT (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);
sprintf (dbf_txt, "dsch%x", irq);
CIO_TRACE_EVENT (2, dbf_txt);
if (ioinfo[irq]->ui.flags.busy) {
/*
* the disable function must not be called while there are
* requests pending for completion !
*/
ret = -EBUSY;
} else {
/*
* 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);
CIO_MSG_EVENT(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;
}
} while (retry);
}
}
sprintf (dbf_txt, "ret:%d", ret);
CIO_TRACE_EVENT (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;
}
/*
* Let's build our path group ID here.
*/
global_pgid = (pgid_t *)alloc_bootmem(sizeof(pgid_t));
global_pgid->cpu_addr = *(__u16 *) __LC_CPUADDR;
global_pgid->cpu_id = ((cpuid_t *) __LC_CPUID)->ident;
global_pgid->cpu_model = ((cpuid_t *) __LC_CPUID)->machine;
global_pgid->tod_high = *(__u32 *) & irq_IPL_TOD;
/*
* 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);
}
sprintf (dbf_txt, "stIO%x", irq);
CIO_TRACE_EVENT (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;
}
#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);
}
}
if (flag & DOIO_DONT_CALL_INTHDLR) {
ioinfo[irq]->ui.flags.repnone = 1;
}
/*
* Issue "Start subchannel" and process condition code
*/
ccode = ssch (irq, &(ioinfo[irq]->orb));
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (4, dbf_txt);
switch (ccode) {
case 0:
if (!ioinfo[irq]->ui.flags.w4sense) {
/*
* init the device driver specific devstat irb area
*
* Note : don磘 clear saved irb info in case of sense !
*/
memset (&((devstat_t *) ioinfo[irq]->irq_desc.dev_id)->
ii.irb, '', sizeof (irb_t));
}
memset (&ioinfo[irq]->devstat.ii.irb, '', 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;
}
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) {
unsigned long psw_mask;
int ccode;
uint64_t time_start;
uint64_t time_curr;
int ready = 0;
int io_sub = -1;
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.
*/
ccode = iac ();
switch (ccode) {
case 0: /* primary-space */
psw_mask = _IO_PSW_MASK
| _PSW_PRIM_SPACE_MODE | _PSW_IO_WAIT;
break;
case 1: /* secondary-space */
psw_mask = _IO_PSW_MASK
| _PSW_SEC_SPACE_MODE | _PSW_IO_WAIT;
break;
case 2: /* access-register */
psw_mask = _IO_PSW_MASK
| _PSW_ACC_REG_MODE | _PSW_IO_WAIT;
break;
case 3: /* home-space */
psw_mask = _IO_PSW_MASK
| _PSW_HOME_SPACE_MODE | _PSW_IO_WAIT;
break;
default:
panic ("start_IO() : unexpected "
"address-space-control %dn", ccode);
break;
}
/*
* 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;
}
} while (do_retry);
} else {
__load_psw_mask (psw_mask);
io_sub =
(__u32) *
(__u16 *) __LC_SUBCHANNEL_NR;
}
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;
}
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,
'', 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;
}
if (ioinfo[irq]->opm == 0) {
ret = -ENODEV;
ioinfo[irq]->ui.flags.oper = 0;
} else {
ret = -EIO;
}
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 pendingn",
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 pendingn",
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 pendingn",
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
if (cio_debug_initialized) {
stsch (irq, &(ioinfo[irq]->schib));
sprintf (buffer,
"s390_start_IO(%04X) - irb for "
"device %04X, after status pendingn",
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 pendingn",
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 pendingn",
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);
}
}
} else {
ret = -EIO;
ioinfo[irq]->devstat.flag &= ~DEVSTAT_NOT_OPER;
ioinfo[irq]->ui.flags.oper = 1;
}
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;
}
if (ioinfo[irq]->opm == 0) {
ioinfo[irq]->ui.flags.oper = 0;
ioinfo[irq]->devstat.flag |= DEVSTAT_NOT_OPER;
}
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' statusn",
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' statusn",
irq, ioinfo[irq]->devstat.devno);
s390_displayhex2 (buffer,
&(ioinfo[irq]->schib),
sizeof (schib_t), 2);
}
break;
}
if (flag & DOIO_WAIT_FOR_INTERRUPT) {
disable_cpu_sync_isc (irq);
}
if (flag & DOIO_DONT_CALL_INTHDLR) {
ioinfo[irq]->ui.flags.repnone = 0;
}
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);
}
sprintf (dbf_txt, "doIO%x", irq);
CIO_TRACE_EVENT (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);
if ((ret == -ETIMEDOUT) && (flag & DOIO_CANCEL_ON_TIMEOUT)) {
/*
* We should better cancel the io request here
* or we might not be able to do io on this sch
* again
*/
cancel_IO (irq);
}
} 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;
}
} else {
ret = -EBUSY;
}
return (ret);
}
/*
* resume suspended I/O operation
*/
int
resume_IO (int irq)
{
int ret = 0;
char dbf_txt[15];
SANITY_CHECK (irq);
sprintf (dbf_txt, "rsIO%x", irq);
CIO_TRACE_EVENT (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);
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (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;
}
} else {
ret = -ENOTCONN;
}
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) {
return -ENODEV;
}
/*
* we ignore the halt_io() request if ending_status was received but
* a SENSE operation is waiting for completion.
*/
if (ioinfo[irq]->ui.flags.w4sense) {
return 0;
}
CIO_TRACE_EVENT (2, "haltIO");
sprintf (dbf_txt, "%x", irq);
CIO_TRACE_EVENT (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);
}
/*
* Issue "Halt subchannel" and process condition code
*/
ccode = hsch (irq);
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (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;
}
/*
* 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;
unsigned long psw_mask;
int ccode;
int ready = 0;
/*
* 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.
*/
ccode = iac ();
switch (ccode) {
case 0: /* primary-space */
psw_mask = _IO_PSW_MASK
| _PSW_PRIM_SPACE_MODE | _PSW_IO_WAIT;
break;
case 1: /* secondary-space */
psw_mask = _IO_PSW_MASK
| _PSW_SEC_SPACE_MODE | _PSW_IO_WAIT;
break;
case 2: /* access-register */
psw_mask = _IO_PSW_MASK
| _PSW_ACC_REG_MODE | _PSW_IO_WAIT;
break;
case 3: /* home-space */
psw_mask = _IO_PSW_MASK
| _PSW_HOME_SPACE_MODE | _PSW_IO_WAIT;
break;
default:
panic ("halt_IO() : unexpected "
"address-space-control %dn", ccode);
break;
}
/*
* 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_mask (psw_mask);
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;
}
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,
'', 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;
}
break;
case 2: /* busy */
ret = -EBUSY;
break;
default: /* device not operational */
ret = -ENODEV;
break;
}
if (flag & DOIO_WAIT_FOR_INTERRUPT) {
disable_cpu_sync_isc (irq);
}
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)
return -ENODEV;
/*
* we ignore the clear_io() request if ending_status was received but
* a SENSE operation is waiting for completion.
*/
if (ioinfo[irq]->ui.flags.w4sense)
return 0;
CIO_TRACE_EVENT (2, "clearIO");
sprintf (dbf_txt, "%x", irq);
CIO_TRACE_EVENT (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);
}
/*
* Issue "Clear subchannel" and process condition code
*/
ccode = csch (irq);
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (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;
}
/*
* 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;
unsigned long psw_mask;
int ccode;
int ready = 0;
/*
* 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.
*/
ccode = iac ();
switch (ccode) {
case 0: /* primary-space */
psw_mask = _IO_PSW_MASK
| _PSW_PRIM_SPACE_MODE | _PSW_IO_WAIT;
break;
case 1: /* secondary-space */
psw_mask = _IO_PSW_MASK
| _PSW_SEC_SPACE_MODE | _PSW_IO_WAIT;
break;
case 2: /* access-register */
psw_mask = _IO_PSW_MASK
| _PSW_ACC_REG_MODE | _PSW_IO_WAIT;
break;
case 3: /* home-space */
psw_mask = _IO_PSW_MASK
| _PSW_HOME_SPACE_MODE | _PSW_IO_WAIT;
break;
default:
panic ("clear_IO() : unexpected "
"address-space-control %dn", ccode);
break;
}
/*
* 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_mask (psw_mask);
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;
}
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;
}
if (flag & DOIO_WAIT_FOR_INTERRUPT) {
disable_cpu_sync_isc (irq);
}
return (ret);
}
/*
* Function: cancel_IO
* Issues a "Cancel Subchannel" on the specified subchannel
* Note: We don't need any fancy intparms and flags here
* since xsch is executed synchronously.
* Only for common I/O internal use as for now.
*/
int
cancel_IO (int irq)
{
int ccode;
char dbf_txt[15];
int ret = 0;
SANITY_CHECK (irq);
CIO_TRACE_EVENT (2, "cancelIO");
sprintf (dbf_txt, "%x", irq);
CIO_TRACE_EVENT (2, dbf_txt);
ccode = xsch (irq);
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (2, dbf_txt);
switch (ccode) {
case 0: /* success */
ret = 0;
break;
case 1: /* status pending */
/* process the pending irq... */
s390_process_IRQ (irq);
ret = -EBUSY;
break;
case 2: /* not applicable */
ret = -EINVAL;
break;
default: /* not oper */
ret = -ENODEV;
}
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 ... */
}
if (ioinfo[irq]->st) {
/* How can that be? */
printk(KERN_WARNING "Received interrupt on "
"non-IO subchannel %x!n", irq);
return;
}
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[256];
if (cio_count_irqs) {
int cpu = smp_processor_id ();
s390_irq_count[cpu]++;
}
CIO_TRACE_EVENT (3, "procIRQ");
sprintf (dbf_txt, "%x", irq);
CIO_TRACE_EVENT (3, dbf_txt);
if (ioinfo[irq] == INVALID_STORAGE_AREA) {
/* we can't properly process the interrupt ... */
#ifdef CONFIG_DEBUG_IO
printk (KERN_CRIT "s390_process_IRQ(%04X) - got interrupt "
"for non-initialized subchannel!n", irq);
#endif /* CONFIG_DEBUG_IO */
CIO_MSG_EVENT (0,
"s390_process_IRQ(%04X) - got interrupt "
"for non-initialized subchannel!n",
irq);
tsch (irq, p_init_irb);
return (1);
}
if (ioinfo[irq]->st) {
/* can't be */
BUG();
return 1;
}
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 */
CIO_MSG_EVENT(0,
"s390_process_IRQ(%04X) "
"- no interrupt handler "
"registered for device "
"%04X !n",
irq,
ioinfo[irq]->devstat.devno);
}
}
/*
* 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));
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (3, dbf_txt);
if (ccode == 1) {
#ifdef CONFIG_DEBUG_IO
printk (KERN_INFO "s390_process_IRQ(%04X) - no status "
"pending...n", irq);
#endif /* CONFIG_DEBUG_IO */
CIO_MSG_EVENT(2,
"s390_process_IRQ(%04X) - no status pendingn",
irq);
} else if (ccode == 3) {
#ifdef CONFIG_DEBUG_IO
printk (KERN_WARNING "s390_process_IRQ(%04X) - subchannel "
"is not operational!n",
irq);
#endif /* CONFIG_DEBUG_IO */
CIO_MSG_EVENT(0,
"s390_process_IRQ(%04X) - subchannel "
"is not operational!n",
irq);
}
/*
* 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;
}
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;
}
/*
* 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;
}
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 "
"receivedn"
" ... device %04X on subchannel %04X, dev_stat "
": %02X sch_stat : %02Xn",
ioinfo[irq]->devstat.devno, irq, dp->dstat,
dp->cstat);
CIO_MSG_EVENT(0,
"Channel-Check or "
"Interface-Control-Check receivedn");
CIO_MSG_EVENT(0,
"... device %04X on subchannel %04X,"
" dev_stat: %02X sch_stat: %02Xn",
ioinfo[irq]->devstat.devno, irq,
dp->dstat, dp->cstat);
chnchk = 1;
}
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;
}
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 %dn",
irq, dp->scnt);
#endif
CIO_MSG_EVENT(4,
"s390_process_IRQ( %04X ): "
"concurrent sense bytes avail %dn",
irq, dp->scnt);
} else {
/* don't copy the sense data area ! */
sdevstat = sizeof (devstat_t) - SENSE_MAX_COUNT;
}
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 "
"or interface control checkn",
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 "
"or interface control checkn",
irq, dp->devno);
s390_displayhex2 (buffer,
&(dp->ii.irb),
sizeof (irb_t), 0);
}
}
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 %04Xn"
" ... device status : %02X "
"subchannel status : %02Xn",
dp->devno, irq, dp->dstat, dp->cstat);
sprintf (buffer, "s390_process_IRQ(%04X) - irb for "
"device %04X, ending_status %dn",
irq, dp->devno, ending_status);
s390_displayhex (buffer, &(dp->ii.irb), sizeof (irb_t));
#endif
CIO_MSG_EVENT(2,
"Unsolicited interrupt "
"received for device %04X "
"on subchannel %04Xn"
" ... device status : %02X "
"subchannel status : %02Xn",
dp->devno,
irq, dp->dstat, dp->cstat);
if (cio_debug_initialized) {
sprintf (buffer,
"s390_process_IRQ(%04X) - irb for "
"device %04X, ending_status %dn", irq,
dp->devno, ending_status);
s390_displayhex2 (buffer,
&(dp->ii.irb),
sizeof (irb_t), 2);
}
}
/*
* 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;
}
/*
* 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;
}
}
/*
* 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);
}
/*
* 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 %dn",
irq, sense_count);
#endif
CIO_MSG_EVENT(4,
"s390_process_IRQ( %04X ): "
"BASIC SENSE bytes avail %dn",
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 countn", irq);
}
} else {
memcpy (udp, dp, sdevstat);
}
}
/*
* 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;
}
allow4handler = 0;
}
/*
* 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;
int do_cancel =
ioinfo[irq]->
qflag & DOIO_CANCEL_ON_TIMEOUT;
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);
}
/*
* better cancel the io when we time out...
*/
if ((ret == -ETIMEDOUT) && do_cancel) {
cancel_IO (irq);
}
}
} 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;
}
ioinfo[irq]->irq_desc.handler (irq, udp, NULL);
}
}
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;
}
if (ioinfo[irq]->opm == 0) {
ioinfo[irq]->ui.flags.oper = 0;
}
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;
}
}
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]->ui.flags.repnone) {
ioinfo[irq]->irq_desc.handler (irq, udp, NULL);
}
ending_status = 1;
break;
}
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;
int rc = 0;
char dbf_txt[15];
SANITY_CHECK (irq);
if (cons_dev != -1)
return -EBUSY;
sprintf (dbf_txt, "scd%x", irq);
CIO_TRACE_EVENT (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_set_bit (6, 24);
}
}
return (rc);
}
int
reset_cons_dev (int irq)
{
int rc = 0;
int ccode;
char dbf_txt[15];
SANITY_CHECK (irq);
if (cons_dev != -1)
return -EBUSY;
sprintf (dbf_txt, "rscd%x", irq);
CIO_TRACE_EVENT (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_clear_bit(6, 24);
}
}
return (rc);
}
int
wait_cons_dev (int irq)
{
int rc = 0;
long save_cr6;
char dbf_txt[15];
if (irq != cons_dev)
return -EINVAL;
sprintf (dbf_txt, "wcd%x", irq);
CIO_TRACE_EVENT (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);
}
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];
sprintf (dbf_txt, "eisc%x", irq);
CIO_TRACE_EVENT (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) &&
(!ioinfo[irq]->st)) {
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);
/* enable sync isc 5 */
cr6 |= 0x04000000;
/* disable standard isc 3 */
cr6 &= 0xEFFFFFFF;
/* disable console isc 7,
* if neccessary */
if (cons_dev != -1)
cr6 &= 0xFEFFFFFF;
__ctl_load (cr6, 6, 6);
rc = 0;
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 */
}
}
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 %xn", irq);
#endif
rc = -EINVAL;
}
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];
sprintf (dbf_txt, "disc%x", irq);
CIO_TRACE_EVENT (4, dbf_txt);
if ((irq <= highest_subchannel) &&
(ioinfo[irq] != INVALID_STORAGE_AREA) &&
(!ioinfo[irq]->st)) {
/*
* 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 lockedn",
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);
/* disable sync isc 5 */
cr6 &= 0xFBFFFFFF;
/* enable standard isc 3 */
cr6 |= 0x10000000;
/* enable console isc 7,
* if neccessary */
if (cons_dev != -1)
cr6 |= 0x01000000;
__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;
}
} while (retry2);
retry1--;
/* try stopping it ... */
if ((ccode) && !clear_pend) {
clear_IO (irq, 0x00004711, 0);
clear_pend = 1;
}
udelay (100);
} while (retry1 && ccode);
ioinfo[irq]->ui.flags.syncio = 0;
sync_isc_cnt = 0;
atomic_set (&sync_isc, -1);
} else {
sync_isc_cnt--;
}
} else {
#ifdef CONFIG_SYNC_ISC_PARANOIA
if (atomic_read (&sync_isc) != -1)
panic
("disable_sync_isc: called with invalid %x while %x lockedn",
irq, atomic_read (&sync_isc));
#endif
rc = -EINVAL;
}
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;
CIO_TRACE_EVENT (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));
}
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;
}
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;
}
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;
}
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;
}
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;
}
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;
}
break;
default:
error = 1;
break;
}
if (init_IRQ_complete) {
kfree (p_diag_data);
} else {
free_bootmem ((unsigned long) p_diag_data, sizeof (diag210_t));
}
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: %02Xn",
devno,
ccode,
p_diag_data->vrdcvcla,
p_diag_data->vrdcvtyp,
p_diag_data->vrdcrccl,
p_diag_data->vrdccrty, p_diag_data->vrdccrmd);
CIO_MSG_EVENT(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: %02Xn",
devno,
ccode,
p_diag_data->vrdcvcla,
p_diag_data->vrdcvtyp,
p_diag_data->vrdcrccl,
p_diag_data->vrdccrty,
p_diag_data->vrdccrmd);
}
}
/*
* 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);
}
SANITY_CHECK (irq);
if (ioinfo[irq]->ui.flags.oper == 0) {
return (-ENODEV);
}
if (ioinfo[irq]->ui.flags.unfriendly) {
/* don't even try it */
return -EUSERS;
}
sprintf (dbf_txt, "rdc%x", irq);
CIO_TRACE_EVENT (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;
}
}
if (!ret) {
if (!*buffer) {
rdc_buf = kmalloc (length, GFP_KERNEL);
} else {
rdc_buf = *buffer;
}
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,
'', 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)));
}
if (!retry) {
ret = (ret == -ENOMEM) ? -ENOMEM : -EBUSY;
}
__restore_flags (flags);
/*
* on success we update the user input parms
*/
if (!ret) {
*buffer = rdc_buf;
}
if (emulated) {
free_irq (irq, &devstat);
}
} else {
__restore_flags (flags);
}
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) {
*buffer = NULL;
*length = 0;
return (-EOPNOTSUPP);
}
if (ioinfo[irq]->ui.flags.unfriendly) {
/* don't even try it */
return -EUSERS;
}
sprintf (dbf_txt, "rcd%x", irq);
CIO_TRACE_EVENT (4, dbf_txt);
/*
* scan for RCD command in extended SenseID data
*/
for (ciw_cnt = 0; (found == 0) && (ciw_cnt < MAX_CIWS); ciw_cnt++) {
if (ioinfo[irq]->senseid.ciw[ciw_cnt].ct == CIW_TYPE_RCD) {
/*
* paranoia check ...
*/
if (ioinfo[irq]->senseid.ciw[ciw_cnt].cmd != 0
&& ioinfo[irq]->senseid.ciw[ciw_cnt].count != 0) {
found = 1;
}
break;
}
}
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);
}
if (rcd_buf == NULL) {
ret = -ENOMEM;
}
if (!ret) {
memset (rcd_buf,
'',
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, '',
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;
}
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 ... */
}
break;
default: /* -EBUSY, -ENODEV, ??? */
retry = 0;
}
} while (retry);
}
}
__restore_flags (flags);
/*
* 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);
}
}
*buffer = NULL;
*length = 0;
}
if (emulated)
free_irq (irq, pdevstat);
} else {
*buffer = NULL;
*length = 0;
ret = -EOPNOTSUPP;
}
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->st)
&& (pi->ui.flags.oper)
&& (!pi->ui.flags.unfriendly)) {
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) &&
(!ioinfo_head->ui.flags.unfriendly) &&
(!ioinfo_head->st)) {
ret_irq = ioinfo_head->irq;
} else if (ioinfo_head->next) {
ret_irq = get_next_available_irq (ioinfo_head->next);
} else {
ret_irq = -ENODEV;
}
} else {
ret_irq = -ENODEV;
}
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) &&
(!ioinfo[irq]->next->ui.flags.unfriendly) &&
(!ioinfo[irq]->next->st)) {
ret_irq = ioinfo[irq]->next->irq;
} else {
ret_irq =
get_next_available_irq (ioinfo[irq]->next);
}
} else {
ret_irq = -ENODEV;
}
} else {
ret_irq = -EINVAL;
}
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.unfriendly) {
pdi->status = DEVSTAT_UNFRIENDLY_DEV;
memset (&(pdi->sid_data), '', sizeof (senseid_t));
pdi->sid_data.cu_type = 0xFFFF;
} else if (ioinfo[irq]->ui.flags.unknown) {
pdi->status = DEVSTAT_UNKNOWN_DEV;
memset (&(pdi->sid_data), '', sizeof (senseid_t));
pdi->sid_data.cu_type = 0xFFFF;
} else {
pdi->status = DEVSTAT_NOT_OPER;
memset (&(pdi->sid_data), '', sizeof (senseid_t));
pdi->sid_data.cu_type = 0xFFFF;
}
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]->st) &&
(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.unfriendly) {
pdi->status = DEVSTAT_UNFRIENDLY_DEV;
memset (&(pdi->sid_data), '',
sizeof (senseid_t));
pdi->sid_data.cu_type = 0xFFFF;
} else if (ioinfo[i]->ui.flags.unknown) {
pdi->status = DEVSTAT_UNKNOWN_DEV;
memset (&(pdi->sid_data),
'', sizeof (senseid_t));
pdi->sid_data.cu_type = 0xFFFF;
} else {
pdi->status = DEVSTAT_NOT_OPER;
memset (&(pdi->sid_data),
'', sizeof (senseid_t));
pdi->sid_data.cu_type = 0xFFFF;
}
if (ioinfo[i]->ui.flags.ready)