[S390] cio: Allow adapter interrupt handlers per isc.
Enhance the adapter interruption API so that device drivers can register a handler for a specific interruption subclass. This will allow different device drivers to move to differently prioritized subclasses in order to avoid congestion. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
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@ -15,6 +15,7 @@
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#include <linux/rcupdate.h>
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#include <linux/rcupdate.h>
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#include <asm/airq.h>
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#include <asm/airq.h>
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#include <asm/isc.h>
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#include "cio.h"
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#include "cio.h"
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#include "cio_debug.h"
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#include "cio_debug.h"
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@ -33,15 +34,15 @@ struct airq_t {
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void *drv_data;
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void *drv_data;
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};
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};
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static union indicator_t indicators;
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static union indicator_t indicators[MAX_ISC];
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static struct airq_t *airqs[NR_AIRQS];
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static struct airq_t *airqs[MAX_ISC][NR_AIRQS];
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static int register_airq(struct airq_t *airq)
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static int register_airq(struct airq_t *airq, u8 isc)
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{
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{
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int i;
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int i;
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for (i = 0; i < NR_AIRQS; i++)
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for (i = 0; i < NR_AIRQS; i++)
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if (!cmpxchg(&airqs[i], NULL, airq))
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if (!cmpxchg(&airqs[isc][i], NULL, airq))
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return i;
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return i;
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return -ENOMEM;
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return -ENOMEM;
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}
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}
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@ -50,18 +51,21 @@ static int register_airq(struct airq_t *airq)
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* s390_register_adapter_interrupt() - register adapter interrupt handler
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* s390_register_adapter_interrupt() - register adapter interrupt handler
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* @handler: adapter handler to be registered
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* @handler: adapter handler to be registered
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* @drv_data: driver data passed with each call to the handler
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* @drv_data: driver data passed with each call to the handler
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* @isc: isc for which the handler should be called
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*
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*
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* Returns:
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* Returns:
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* Pointer to the indicator to be used on success
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* Pointer to the indicator to be used on success
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* ERR_PTR() if registration failed
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* ERR_PTR() if registration failed
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*/
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*/
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void *s390_register_adapter_interrupt(adapter_int_handler_t handler,
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void *s390_register_adapter_interrupt(adapter_int_handler_t handler,
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void *drv_data)
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void *drv_data, u8 isc)
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{
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{
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struct airq_t *airq;
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struct airq_t *airq;
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char dbf_txt[16];
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char dbf_txt[16];
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int ret;
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int ret;
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if (isc > MAX_ISC)
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return ERR_PTR(-EINVAL);
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airq = kmalloc(sizeof(struct airq_t), GFP_KERNEL);
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airq = kmalloc(sizeof(struct airq_t), GFP_KERNEL);
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if (!airq) {
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if (!airq) {
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ret = -ENOMEM;
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ret = -ENOMEM;
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@ -69,34 +73,35 @@ void *s390_register_adapter_interrupt(adapter_int_handler_t handler,
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}
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}
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airq->handler = handler;
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airq->handler = handler;
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airq->drv_data = drv_data;
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airq->drv_data = drv_data;
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ret = register_airq(airq);
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if (ret < 0)
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ret = register_airq(airq, isc);
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kfree(airq);
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out:
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out:
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snprintf(dbf_txt, sizeof(dbf_txt), "rairq:%d", ret);
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snprintf(dbf_txt, sizeof(dbf_txt), "rairq:%d", ret);
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CIO_TRACE_EVENT(4, dbf_txt);
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CIO_TRACE_EVENT(4, dbf_txt);
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if (ret < 0)
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if (ret < 0) {
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kfree(airq);
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return ERR_PTR(ret);
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return ERR_PTR(ret);
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else
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} else
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return &indicators.byte[ret];
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return &indicators[isc].byte[ret];
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}
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}
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EXPORT_SYMBOL(s390_register_adapter_interrupt);
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EXPORT_SYMBOL(s390_register_adapter_interrupt);
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/**
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/**
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* s390_unregister_adapter_interrupt - unregister adapter interrupt handler
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* s390_unregister_adapter_interrupt - unregister adapter interrupt handler
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* @ind: indicator for which the handler is to be unregistered
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* @ind: indicator for which the handler is to be unregistered
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* @isc: interruption subclass
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*/
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*/
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void s390_unregister_adapter_interrupt(void *ind)
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void s390_unregister_adapter_interrupt(void *ind, u8 isc)
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{
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{
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struct airq_t *airq;
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struct airq_t *airq;
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char dbf_txt[16];
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char dbf_txt[16];
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int i;
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int i;
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i = (int) ((addr_t) ind) - ((addr_t) &indicators.byte[0]);
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i = (int) ((addr_t) ind) - ((addr_t) &indicators[isc].byte[0]);
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snprintf(dbf_txt, sizeof(dbf_txt), "urairq:%d", i);
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snprintf(dbf_txt, sizeof(dbf_txt), "urairq:%d", i);
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CIO_TRACE_EVENT(4, dbf_txt);
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CIO_TRACE_EVENT(4, dbf_txt);
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indicators.byte[i] = 0;
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indicators[isc].byte[i] = 0;
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airq = xchg(&airqs[i], NULL);
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airq = xchg(&airqs[isc][i], NULL);
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/*
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/*
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* Allow interrupts to complete. This will ensure that the airq handle
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* Allow interrupts to complete. This will ensure that the airq handle
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* is no longer referenced by any interrupt handler.
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* is no longer referenced by any interrupt handler.
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@ -108,7 +113,7 @@ EXPORT_SYMBOL(s390_unregister_adapter_interrupt);
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#define INDICATOR_MASK (0xffUL << ((NR_AIRQS_PER_WORD - 1) * 8))
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#define INDICATOR_MASK (0xffUL << ((NR_AIRQS_PER_WORD - 1) * 8))
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void do_adapter_IO(void)
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void do_adapter_IO(u8 isc)
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{
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{
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int w;
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int w;
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int i;
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int i;
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@ -120,22 +125,22 @@ void do_adapter_IO(void)
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* fetch operations.
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* fetch operations.
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*/
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*/
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for (w = 0; w < NR_AIRQ_WORDS; w++) {
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for (w = 0; w < NR_AIRQ_WORDS; w++) {
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word = indicators.word[w];
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word = indicators[isc].word[w];
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i = w * NR_AIRQS_PER_WORD;
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i = w * NR_AIRQS_PER_WORD;
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/*
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/*
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* Check bytes within word for active indicators.
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* Check bytes within word for active indicators.
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*/
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*/
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while (word) {
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while (word) {
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if (word & INDICATOR_MASK) {
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if (word & INDICATOR_MASK) {
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airq = airqs[i];
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airq = airqs[isc][i];
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if (likely(airq))
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if (likely(airq))
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airq->handler(&indicators.byte[i],
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airq->handler(&indicators[isc].byte[i],
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airq->drv_data);
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airq->drv_data);
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else
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else
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/*
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/*
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* Reset ill-behaved indicator.
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* Reset ill-behaved indicator.
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*/
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*/
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indicators.byte[i] = 0;
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indicators[isc].byte[i] = 0;
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}
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}
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word <<= 8;
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word <<= 8;
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i++;
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i++;
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@ -641,7 +641,7 @@ do_IRQ (struct pt_regs *regs)
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*/
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*/
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if (tpi_info->adapter_IO == 1 &&
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if (tpi_info->adapter_IO == 1 &&
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tpi_info->int_type == IO_INTERRUPT_TYPE) {
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tpi_info->int_type == IO_INTERRUPT_TYPE) {
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do_adapter_IO();
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do_adapter_IO(tpi_info->isc);
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continue;
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continue;
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}
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}
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sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
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sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
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@ -106,7 +106,7 @@ int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);
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int cio_tm_intrg(struct subchannel *sch);
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int cio_tm_intrg(struct subchannel *sch);
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int cio_create_sch_lock(struct subchannel *);
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int cio_create_sch_lock(struct subchannel *);
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void do_adapter_IO(void);
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void do_adapter_IO(u8 isc);
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void do_IRQ(struct pt_regs *);
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void do_IRQ(struct pt_regs *);
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/* Use with care. */
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/* Use with care. */
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@ -3713,7 +3713,8 @@ tiqdio_register_thinints(void)
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char dbf_text[20];
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char dbf_text[20];
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tiqdio_ind =
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tiqdio_ind =
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s390_register_adapter_interrupt(&tiqdio_thinint_handler, NULL);
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s390_register_adapter_interrupt(&tiqdio_thinint_handler, NULL,
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TIQDIO_THININT_ISC);
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if (IS_ERR(tiqdio_ind)) {
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if (IS_ERR(tiqdio_ind)) {
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sprintf(dbf_text, "regthn%lx", PTR_ERR(tiqdio_ind));
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sprintf(dbf_text, "regthn%lx", PTR_ERR(tiqdio_ind));
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QDIO_DBF_TEXT0(0,setup,dbf_text);
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QDIO_DBF_TEXT0(0,setup,dbf_text);
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@ -3729,7 +3730,8 @@ static void
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tiqdio_unregister_thinints(void)
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tiqdio_unregister_thinints(void)
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{
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{
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if (tiqdio_ind)
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if (tiqdio_ind)
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s390_unregister_adapter_interrupt(tiqdio_ind);
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s390_unregister_adapter_interrupt(tiqdio_ind,
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TIQDIO_THININT_ISC);
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}
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}
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static int
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static int
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typedef void (*adapter_int_handler_t)(void *, void *);
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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 *);
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void *s390_register_adapter_interrupt(adapter_int_handler_t, void *, u8);
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void s390_unregister_adapter_interrupt(void *);
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void s390_unregister_adapter_interrupt(void *, u8);
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#endif /* _ASM_S390_AIRQ_H */
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#endif /* _ASM_S390_AIRQ_H */
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