linux/drivers/s390/cio/qdio_thinint.c
Jan Glauber d0c9d4a89f [S390] qdio: set correct bit in dsci
The state change indicator is bit 7 not bit 0 of the dsci. Use the
correct bit for setting the indicator.

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2010-05-17 10:00:17 +02:00

298 lines
7.1 KiB
C

/*
* linux/drivers/s390/cio/thinint_qdio.c
*
* Copyright 2000,2009 IBM Corp.
* Author(s): Utz Bacher <utz.bacher@de.ibm.com>
* Cornelia Huck <cornelia.huck@de.ibm.com>
* Jan Glauber <jang@linux.vnet.ibm.com>
*/
#include <linux/io.h>
#include <linux/slab.h>
#include <asm/atomic.h>
#include <asm/debug.h>
#include <asm/qdio.h>
#include <asm/airq.h>
#include <asm/isc.h>
#include "cio.h"
#include "ioasm.h"
#include "qdio.h"
#include "qdio_debug.h"
/*
* Restriction: only 63 iqdio subchannels would have its own indicator,
* after that, subsequent subchannels share one indicator
*/
#define TIQDIO_NR_NONSHARED_IND 63
#define TIQDIO_NR_INDICATORS (TIQDIO_NR_NONSHARED_IND + 1)
#define TIQDIO_SHARED_IND 63
/* list of thin interrupt input queues */
static LIST_HEAD(tiq_list);
DEFINE_MUTEX(tiq_list_lock);
/* adapter local summary indicator */
static unsigned char *tiqdio_alsi;
/* device state change indicators */
struct indicator_t {
u32 ind; /* u32 because of compare-and-swap performance */
atomic_t count; /* use count, 0 or 1 for non-shared indicators */
};
static struct indicator_t *q_indicators;
static int css_qdio_omit_svs;
static inline unsigned long do_clear_global_summary(void)
{
register unsigned long __fn asm("1") = 3;
register unsigned long __tmp asm("2");
register unsigned long __time asm("3");
asm volatile(
" .insn rre,0xb2650000,2,0"
: "+d" (__fn), "=d" (__tmp), "=d" (__time));
return __time;
}
/* returns addr for the device state change indicator */
static u32 *get_indicator(void)
{
int i;
for (i = 0; i < TIQDIO_NR_NONSHARED_IND; i++)
if (!atomic_read(&q_indicators[i].count)) {
atomic_set(&q_indicators[i].count, 1);
return &q_indicators[i].ind;
}
/* use the shared indicator */
atomic_inc(&q_indicators[TIQDIO_SHARED_IND].count);
return &q_indicators[TIQDIO_SHARED_IND].ind;
}
static void put_indicator(u32 *addr)
{
int i;
if (!addr)
return;
i = ((unsigned long)addr - (unsigned long)q_indicators) /
sizeof(struct indicator_t);
atomic_dec(&q_indicators[i].count);
}
void tiqdio_add_input_queues(struct qdio_irq *irq_ptr)
{
struct qdio_q *q;
int i;
/* No TDD facility? If we must use SIGA-s we can also omit SVS. */
if (!css_qdio_omit_svs && irq_ptr->siga_flag.sync)
css_qdio_omit_svs = 1;
mutex_lock(&tiq_list_lock);
for_each_input_queue(irq_ptr, q, i)
list_add_rcu(&q->entry, &tiq_list);
mutex_unlock(&tiq_list_lock);
xchg(irq_ptr->dsci, 1 << 7);
}
void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr)
{
struct qdio_q *q;
int i;
for (i = 0; i < irq_ptr->nr_input_qs; i++) {
q = irq_ptr->input_qs[i];
/* if establish triggered an error */
if (!q || !q->entry.prev || !q->entry.next)
continue;
mutex_lock(&tiq_list_lock);
list_del_rcu(&q->entry);
mutex_unlock(&tiq_list_lock);
synchronize_rcu();
}
}
static inline int shared_ind(struct qdio_irq *irq_ptr)
{
return irq_ptr->dsci == &q_indicators[TIQDIO_SHARED_IND].ind;
}
/**
* tiqdio_thinint_handler - thin interrupt handler for qdio
* @ind: pointer to adapter local summary indicator
* @drv_data: NULL
*/
static void tiqdio_thinint_handler(void *ind, void *drv_data)
{
struct qdio_q *q;
/*
* SVS only when needed: issue SVS to benefit from iqdio interrupt
* avoidance (SVS clears adapter interrupt suppression overwrite)
*/
if (!css_qdio_omit_svs)
do_clear_global_summary();
/*
* reset local summary indicator (tiqdio_alsi) to stop adapter
* interrupts for now
*/
xchg((u8 *)ind, 0);
/* protect tiq_list entries, only changed in activate or shutdown */
rcu_read_lock();
/* check for work on all inbound thinint queues */
list_for_each_entry_rcu(q, &tiq_list, entry)
/* only process queues from changed sets */
if (*q->irq_ptr->dsci) {
qperf_inc(q, adapter_int);
/* only clear it if the indicator is non-shared */
if (!shared_ind(q->irq_ptr))
xchg(q->irq_ptr->dsci, 0);
/*
* don't call inbound processing directly since
* that could starve other thinint queues
*/
tasklet_schedule(&q->tasklet);
}
rcu_read_unlock();
/*
* if we used the shared indicator clear it now after all queues
* were processed
*/
if (atomic_read(&q_indicators[TIQDIO_SHARED_IND].count)) {
xchg(&q_indicators[TIQDIO_SHARED_IND].ind, 0);
/* prevent racing */
if (*tiqdio_alsi)
xchg(&q_indicators[TIQDIO_SHARED_IND].ind, 1 << 7);
}
}
static int set_subchannel_ind(struct qdio_irq *irq_ptr, int reset)
{
struct scssc_area *scssc_area;
int rc;
scssc_area = (struct scssc_area *)irq_ptr->chsc_page;
memset(scssc_area, 0, PAGE_SIZE);
if (reset) {
scssc_area->summary_indicator_addr = 0;
scssc_area->subchannel_indicator_addr = 0;
} else {
scssc_area->summary_indicator_addr = virt_to_phys(tiqdio_alsi);
scssc_area->subchannel_indicator_addr =
virt_to_phys(irq_ptr->dsci);
}
scssc_area->request = (struct chsc_header) {
.length = 0x0fe0,
.code = 0x0021,
};
scssc_area->operation_code = 0;
scssc_area->ks = PAGE_DEFAULT_KEY >> 4;
scssc_area->kc = PAGE_DEFAULT_KEY >> 4;
scssc_area->isc = QDIO_AIRQ_ISC;
scssc_area->schid = irq_ptr->schid;
/* enable the time delay disablement facility */
if (css_general_characteristics.aif_tdd)
scssc_area->word_with_d_bit = 0x10000000;
rc = chsc(scssc_area);
if (rc)
return -EIO;
rc = chsc_error_from_response(scssc_area->response.code);
if (rc) {
DBF_ERROR("%4x SSI r:%4x", irq_ptr->schid.sch_no,
scssc_area->response.code);
DBF_ERROR_HEX(&scssc_area->response, sizeof(void *));
return rc;
}
DBF_EVENT("setscind");
DBF_HEX(&scssc_area->summary_indicator_addr, sizeof(unsigned long));
DBF_HEX(&scssc_area->subchannel_indicator_addr, sizeof(unsigned long));
return 0;
}
/* allocate non-shared indicators and shared indicator */
int __init tiqdio_allocate_memory(void)
{
q_indicators = kzalloc(sizeof(struct indicator_t) * TIQDIO_NR_INDICATORS,
GFP_KERNEL);
if (!q_indicators)
return -ENOMEM;
return 0;
}
void tiqdio_free_memory(void)
{
kfree(q_indicators);
}
int __init tiqdio_register_thinints(void)
{
isc_register(QDIO_AIRQ_ISC);
tiqdio_alsi = s390_register_adapter_interrupt(&tiqdio_thinint_handler,
NULL, QDIO_AIRQ_ISC);
if (IS_ERR(tiqdio_alsi)) {
DBF_EVENT("RTI:%lx", PTR_ERR(tiqdio_alsi));
tiqdio_alsi = NULL;
isc_unregister(QDIO_AIRQ_ISC);
return -ENOMEM;
}
return 0;
}
int qdio_establish_thinint(struct qdio_irq *irq_ptr)
{
if (!is_thinint_irq(irq_ptr))
return 0;
/* Check for aif time delay disablement. If installed,
* omit SVS even under LPAR
*/
if (css_general_characteristics.aif_tdd)
css_qdio_omit_svs = 1;
return set_subchannel_ind(irq_ptr, 0);
}
void qdio_setup_thinint(struct qdio_irq *irq_ptr)
{
if (!is_thinint_irq(irq_ptr))
return;
irq_ptr->dsci = get_indicator();
DBF_HEX(&irq_ptr->dsci, sizeof(void *));
}
void qdio_shutdown_thinint(struct qdio_irq *irq_ptr)
{
if (!is_thinint_irq(irq_ptr))
return;
/* reset adapter interrupt indicators */
put_indicator(irq_ptr->dsci);
set_subchannel_ind(irq_ptr, 1);
}
void __exit tiqdio_unregister_thinints(void)
{
WARN_ON(!list_empty(&tiq_list));
if (tiqdio_alsi) {
s390_unregister_adapter_interrupt(tiqdio_alsi, QDIO_AIRQ_ISC);
isc_unregister(QDIO_AIRQ_ISC);
}
}