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yaml --- r: 77179 b: refs/heads/master c: 4e8e56c h: refs/heads/master i: 77177: 72a04af 77175: 669b455 v: v3
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Peter Oberparleiter
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Martin Schwidefsky
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Jan 26, 2008
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: cd6b4f27b9bb2a6a5ec82b96b87c85421257be6c | ||
| refs/heads/master: 4e8e56c6713398f417317d449f50c08bf2756c66 |
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,85 +1,144 @@ | ||
| /* | ||
| * 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> | ||
| #include <linux/module.h> | ||
| #include <linux/slab.h> | ||
| #include <linux/rcupdate.h> | ||
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| #include <asm/airq.h> | ||
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| #include "cio.h" | ||
| #include "cio_debug.h" | ||
| #include "airq.h" | ||
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| 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) | ||
|
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| /* | ||
| * 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; | ||
| char dbf_txt[15]; | ||
| union indicator_t { | ||
| unsigned long word[NR_AIRQ_WORDS]; | ||
| unsigned char byte[NR_AIRQS]; | ||
| } __attribute__((packed)); | ||
|
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| CIO_TRACE_EVENT (4, "rgaint"); | ||
| struct airq_t { | ||
| adapter_int_handler_t handler; | ||
| void *drv_data; | ||
| }; | ||
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| if (handler == NULL) | ||
| ret = -EINVAL; | ||
| else | ||
| ret = (cmpxchg(&adapter_handler, NULL, handler) ? -EBUSY : 0); | ||
| if (!ret) | ||
| synchronize_sched(); /* Allow interrupts to complete. */ | ||
| static union indicator_t indicators; | ||
| static struct airq_t *airqs[NR_AIRQS]; | ||
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| sprintf (dbf_txt, "ret:%d", ret); | ||
| CIO_TRACE_EVENT (4, dbf_txt); | ||
| static int register_airq(struct airq_t *airq) | ||
| { | ||
| int i; | ||
|
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| return ret; | ||
| for (i = 0; i < NR_AIRQS; i++) | ||
| if (!cmpxchg(&airqs[i], NULL, airq)) | ||
| return i; | ||
| return -ENOMEM; | ||
| } | ||
|
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| int | ||
| s390_unregister_adapter_interrupt (adapter_int_handler_t handler) | ||
| /** | ||
| * 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 | ||
| * | ||
| * Returns: | ||
| * Pointer to the indicator to be used on success | ||
| * ERR_PTR() if registration failed | ||
| */ | ||
| 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]; | ||
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| CIO_TRACE_EVENT (4, "urgaint"); | ||
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| 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); | ||
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| 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); | ||
|
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| 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; | ||
|
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| 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); | ||
|
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| #define INDICATOR_MASK (0xffUL << ((NR_AIRQS_PER_WORD - 1) * 8)) | ||
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| EXPORT_SYMBOL (s390_register_adapter_interrupt); | ||
| EXPORT_SYMBOL (s390_unregister_adapter_interrupt); | ||
| void do_adapter_IO(void) | ||
| { | ||
| int w; | ||
| int i; | ||
| unsigned long word; | ||
| struct airq_t *airq; | ||
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| /* | ||
| * 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++; | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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> | ||
| */ | ||
|
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| #ifndef _ASM_S390_AIRQ_H | ||
| #define _ASM_S390_AIRQ_H | ||
|
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| typedef void (*adapter_int_handler_t)(void *, void *); | ||
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| void *s390_register_adapter_interrupt(adapter_int_handler_t, void *); | ||
| void s390_unregister_adapter_interrupt(void *); | ||
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| #endif /* _ASM_S390_AIRQ_H */ |