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[S390] cio: Extend adapter interrupt interface. 

From: Cornelia Huck <cornelia.huck@de.ibm.com>

Change the adapter interrupt interface in order to allow multiple
adapter interrupt handlers to be registered. Indicators are now
allocated by cio instead of the device driver.

The qdio parts have been
Acked-by: Ursula Braun <ubraun@linux.vnet.ibm.com>

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Peter Oberparleiter 2008-01-26 14:10:44 +01:00 committed by Martin Schwidefsky
parent cd6b4f27b9
commit 4e8e56c671
7 changed files with 158 additions and 89 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/DocBook/s390-drivers.tmpl
View File

@ -116,6 +116,7 @@
!Iinclude/asm-s390/ccwdev.h
!Edrivers/s390/cio/device.c
!Edrivers/s390/cio/device_ops.c
!Edrivers/s390/cio/airq.c
</sect1>
<sect1 id="cmf">
<title>The channel-measurement facility</title>

179
drivers/s390/cio/airq.c
View File

@ -1,12 +1,12 @@
/*
* drivers/s390/cio/airq.c
* S/390 common I/O routines -- support for adapter interruptions
* Support for adapter interruptions
*
* Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
* IBM Corporation
* Author(s): Ingo Adlung (adlung@de.ibm.com)
* Cornelia Huck (cornelia.huck@de.ibm.com)
* Arnd Bergmann (arndb@de.ibm.com)
* Copyright IBM Corp. 1999,2007
* Author(s): Ingo Adlung <adlung@de.ibm.com>
* Cornelia Huck <cornelia.huck@de.ibm.com>
* Arnd Bergmann <arndb@de.ibm.com>
* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
*/
#include <linux/init.h>
@ -14,72 +14,131 @@
#include <linux/slab.h>
#include <linux/rcupdate.h>
#include <asm/airq.h>
#include "cio.h"
#include "cio_debug.h"
#include "airq.h"
static adapter_int_handler_t adapter_handler;
#define NR_AIRQS 32
#define NR_AIRQS_PER_WORD sizeof(unsigned long)
#define NR_AIRQ_WORDS (NR_AIRQS / NR_AIRQS_PER_WORD)
/*
* register for adapter interrupts
union indicator_t {
unsigned long word[NR_AIRQ_WORDS];
unsigned char byte[NR_AIRQS];
} __attribute__((packed));
struct airq_t {
adapter_int_handler_t handler;
void *drv_data;
};
static union indicator_t indicators;
static struct airq_t *airqs[NR_AIRQS];
static int register_airq(struct airq_t *airq)
{
int i;
for (i = 0; i < NR_AIRQS; i++)
if (!cmpxchg(&airqs[i], NULL, airq))
return i;
return -ENOMEM;
}
/**
* s390_register_adapter_interrupt() - register adapter interrupt handler
* @handler: adapter handler to be registered
* @drv_data: driver data passed with each call to the handler
*
* 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 ...
* Returns:
* Pointer to the indicator to be used on success
* ERR_PTR() if registration failed
*/
int
s390_register_adapter_interrupt (adapter_int_handler_t handler)
void *s390_register_adapter_interrupt(adapter_int_handler_t handler,
void *drv_data)
{
struct airq_t *airq;
char dbf_txt[16];
int ret;
char dbf_txt[15];
CIO_TRACE_EVENT (4, "rgaint");
if (handler == NULL)
ret = -EINVAL;
else
ret = (cmpxchg(&adapter_handler, NULL, handler) ? -EBUSY : 0);
if (!ret)
synchronize_sched(); /* Allow interrupts to complete. */
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;
char dbf_txt[15];
CIO_TRACE_EVENT (4, "urgaint");
if (handler == NULL)
ret = -EINVAL;
else {
adapter_handler = NULL;
synchronize_sched(); /* Allow interrupts to complete. */
ret = 0;
airq = kmalloc(sizeof(struct airq_t), GFP_KERNEL);
if (!airq) {
ret = -ENOMEM;
goto out;
}
sprintf (dbf_txt, "ret:%d", ret);
CIO_TRACE_EVENT (4, dbf_txt);
return ret;
airq->handler = handler;
airq->drv_data = drv_data;
ret = register_airq(airq);
if (ret < 0)
kfree(airq);
out:
snprintf(dbf_txt, sizeof(dbf_txt), "rairq:%d", ret);
CIO_TRACE_EVENT(4, dbf_txt);
if (ret < 0)
return ERR_PTR(ret);
else
return &indicators.byte[ret];
}
EXPORT_SYMBOL(s390_register_adapter_interrupt);
void
do_adapter_IO (void)
/**
* s390_unregister_adapter_interrupt - unregister adapter interrupt handler
* @ind: indicator for which the handler is to be unregistered
*/
void s390_unregister_adapter_interrupt(void *ind)
{
CIO_TRACE_EVENT (6, "doaio");
struct airq_t *airq;
char dbf_txt[16];
int i;
if (adapter_handler)
(*adapter_handler) ();
i = (int) ((addr_t) ind) - ((addr_t) &indicators.byte[0]);
snprintf(dbf_txt, sizeof(dbf_txt), "urairq:%d", i);
CIO_TRACE_EVENT(4, dbf_txt);
indicators.byte[i] = 0;
airq = xchg(&airqs[i], NULL);
/*
* Allow interrupts to complete. This will ensure that the airq handle
* is no longer referenced by any interrupt handler.
*/
synchronize_sched();
kfree(airq);
}
EXPORT_SYMBOL(s390_unregister_adapter_interrupt);
EXPORT_SYMBOL (s390_register_adapter_interrupt);
EXPORT_SYMBOL (s390_unregister_adapter_interrupt);
#define INDICATOR_MASK (0xffUL << ((NR_AIRQS_PER_WORD - 1) * 8))
void do_adapter_IO(void)
{
int w;
int i;
unsigned long word;
struct airq_t *airq;
/*
* Access indicator array in word-sized chunks to minimize storage
* fetch operations.
*/
for (w = 0; w < NR_AIRQ_WORDS; w++) {
word = indicators.word[w];
i = w * NR_AIRQS_PER_WORD;
/*
* Check bytes within word for active indicators.
*/
while (word) {
if (word & INDICATOR_MASK) {
airq = airqs[i];
if (likely(airq))
airq->handler(&indicators.byte[i],
airq->drv_data);
else
/*
* Reset ill-behaved indicator.
*/
indicators.byte[i] = 0;
}
word <<= 8;
i++;
}
}
}

10
drivers/s390/cio/airq.h
View File

@ -1,10 +0,0 @@
#ifndef S390_AINTERRUPT_H
#define S390_AINTERRUPT_H
typedef int (*adapter_int_handler_t)(void);
extern int s390_register_adapter_interrupt(adapter_int_handler_t handler);
extern int s390_unregister_adapter_interrupt(adapter_int_handler_t handler);
extern void do_adapter_IO (void);
#endif

2
drivers/s390/cio/cio.c
View File

@ -23,7 +23,7 @@
#include <asm/reset.h>
#include <asm/ipl.h>
#include <asm/chpid.h>
#include "airq.h"
#include <asm/airq.h>
#include "cio.h"
#include "css.h"
#include "chsc.h"

1
drivers/s390/cio/cio.h
View File

@ -99,6 +99,7 @@ extern int cio_get_options (struct subchannel *);
extern int cio_modify (struct subchannel *);
int cio_create_sch_lock(struct subchannel *);
void do_adapter_IO(void);
/* Use with care. */
#ifdef CONFIG_CCW_CONSOLE

35
drivers/s390/cio/qdio.c
View File

@ -48,11 +48,11 @@
#include <asm/debug.h>
#include <asm/s390_rdev.h>
#include <asm/qdio.h>
#include <asm/airq.h>
#include "cio.h"
#include "css.h"
#include "device.h"
#include "airq.h"
#include "qdio.h"
#include "ioasm.h"
#include "chsc.h"
@ -96,7 +96,7 @@ static debug_info_t *qdio_dbf_slsb_in;
static volatile struct qdio_q *tiq_list=NULL; /* volatile as it could change
during a while loop */
static DEFINE_SPINLOCK(ttiq_list_lock);
static int register_thinint_result;
static void *tiqdio_ind;
static void tiqdio_tl(unsigned long);
static DECLARE_TASKLET(tiqdio_tasklet,tiqdio_tl,0);
@ -399,7 +399,7 @@ qdio_get_indicator(void)
{
int i;
for (i=1;i<INDICATORS_PER_CACHELINE;i++)
for (i = 0; i < INDICATORS_PER_CACHELINE; i++)
if (!indicator_used[i]) {
indicator_used[i]=1;
return indicators+i;
@ -1911,8 +1911,7 @@ qdio_fill_thresholds(struct qdio_irq *irq_ptr,
}
}
static int
tiqdio_thinint_handler(void)
static void tiqdio_thinint_handler(void *ind, void *drv_data)
{
QDIO_DBF_TEXT4(0,trace,"thin_int");
@ -1925,7 +1924,6 @@ tiqdio_thinint_handler(void)
tiqdio_clear_global_summary();
tiqdio_inbound_checks();
return 0;
}
static void
@ -2445,7 +2443,7 @@ tiqdio_set_subchannel_ind(struct qdio_irq *irq_ptr, int reset_to_zero)
real_addr_dev_st_chg_ind=0;
} else {
real_addr_local_summary_bit=
virt_to_phys((volatile void *)indicators);
virt_to_phys((volatile void *)tiqdio_ind);
real_addr_dev_st_chg_ind=
virt_to_phys((volatile void *)irq_ptr->dev_st_chg_ind);
}
@ -3740,23 +3738,25 @@ static void
tiqdio_register_thinints(void)
{
char dbf_text[20];
register_thinint_result=
s390_register_adapter_interrupt(&tiqdio_thinint_handler);
if (register_thinint_result) {
sprintf(dbf_text,"regthn%x",(register_thinint_result&0xff));
tiqdio_ind =
s390_register_adapter_interrupt(&tiqdio_thinint_handler, NULL);
if (IS_ERR(tiqdio_ind)) {
sprintf(dbf_text, "regthn%lx", PTR_ERR(tiqdio_ind));
QDIO_DBF_TEXT0(0,setup,dbf_text);
QDIO_PRINT_ERR("failed to register adapter handler " \
"(rc=%i).\nAdapter interrupts might " \
"(rc=%li).\nAdapter interrupts might " \
"not work. Continuing.\n",
register_thinint_result);
PTR_ERR(tiqdio_ind));
tiqdio_ind = NULL;
}
}
static void
tiqdio_unregister_thinints(void)
{
if (!register_thinint_result)
s390_unregister_adapter_interrupt(&tiqdio_thinint_handler);
if (tiqdio_ind)
s390_unregister_adapter_interrupt(tiqdio_ind);
}
static int
@ -3768,8 +3768,8 @@ qdio_get_qdio_memory(void)
for (i=1;i<INDICATORS_PER_CACHELINE;i++)
indicator_used[i]=0;
indicators = kzalloc(sizeof(__u32)*(INDICATORS_PER_CACHELINE),
GFP_KERNEL);
if (!indicators)
GFP_KERNEL);
if (!indicators)
return -ENOMEM;
return 0;
}
@ -3780,7 +3780,6 @@ qdio_release_qdio_memory(void)
kfree(indicators);
}
static void
qdio_unregister_dbf_views(void)
{

19
include/asm-s390/airq.h Normal file
View File

@ -0,0 +1,19 @@
/*
* include/asm-s390/airq.h
*
* Copyright IBM Corp. 2002,2007
* Author(s): Ingo Adlung <adlung@de.ibm.com>
* Cornelia Huck <cornelia.huck@de.ibm.com>
* Arnd Bergmann <arndb@de.ibm.com>
* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
*/
#ifndef _ASM_S390_AIRQ_H
#define _ASM_S390_AIRQ_H
typedef void (*adapter_int_handler_t)(void *, void *);
void *s390_register_adapter_interrupt(adapter_int_handler_t, void *);
void s390_unregister_adapter_interrupt(void *);
#endif /* _ASM_S390_AIRQ_H */