301 lines
7.1 KiB
C
301 lines
7.1 KiB
C
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/*
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* linux/drivers/s390/cio/thinint_qdio.c
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*
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* thin interrupt support for qdio
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*
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* Copyright 2000-2008 IBM Corp.
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* Author(s): Utz Bacher <utz.bacher@de.ibm.com>
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* Cornelia Huck <cornelia.huck@de.ibm.com>
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* Jan Glauber <jang@linux.vnet.ibm.com>
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*/
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#include <linux/io.h>
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#include <asm/atomic.h>
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#include <asm/debug.h>
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#include <asm/qdio.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 "ioasm.h"
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#include "qdio.h"
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#include "qdio_debug.h"
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#include "qdio_perf.h"
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/*
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* Restriction: only 63 iqdio subchannels would have its own indicator,
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* after that, subsequent subchannels share one indicator
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*/
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#define TIQDIO_NR_NONSHARED_IND 63
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#define TIQDIO_NR_INDICATORS (TIQDIO_NR_NONSHARED_IND + 1)
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#define TIQDIO_SHARED_IND 63
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/* list of thin interrupt input queues */
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static LIST_HEAD(tiq_list);
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DEFINE_MUTEX(tiq_list_lock);
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/* adapter local summary indicator */
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static unsigned char *tiqdio_alsi;
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/* device state change indicators */
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struct indicator_t {
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u32 ind; /* u32 because of compare-and-swap performance */
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atomic_t count; /* use count, 0 or 1 for non-shared indicators */
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};
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static struct indicator_t *q_indicators;
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static int css_qdio_omit_svs;
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static inline unsigned long do_clear_global_summary(void)
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{
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register unsigned long __fn asm("1") = 3;
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register unsigned long __tmp asm("2");
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register unsigned long __time asm("3");
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asm volatile(
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" .insn rre,0xb2650000,2,0"
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: "+d" (__fn), "=d" (__tmp), "=d" (__time));
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return __time;
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}
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/* returns addr for the device state change indicator */
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static u32 *get_indicator(void)
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{
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int i;
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for (i = 0; i < TIQDIO_NR_NONSHARED_IND; i++)
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if (!atomic_read(&q_indicators[i].count)) {
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atomic_set(&q_indicators[i].count, 1);
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return &q_indicators[i].ind;
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}
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/* use the shared indicator */
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atomic_inc(&q_indicators[TIQDIO_SHARED_IND].count);
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return &q_indicators[TIQDIO_SHARED_IND].ind;
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}
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static void put_indicator(u32 *addr)
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{
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int i;
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if (!addr)
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return;
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i = ((unsigned long)addr - (unsigned long)q_indicators) /
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sizeof(struct indicator_t);
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atomic_dec(&q_indicators[i].count);
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}
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void tiqdio_add_input_queues(struct qdio_irq *irq_ptr)
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{
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struct qdio_q *q;
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int i;
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/* No TDD facility? If we must use SIGA-s we can also omit SVS. */
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if (!css_qdio_omit_svs && irq_ptr->siga_flag.sync)
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css_qdio_omit_svs = 1;
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mutex_lock(&tiq_list_lock);
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for_each_input_queue(irq_ptr, q, i)
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list_add_rcu(&q->entry, &tiq_list);
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mutex_unlock(&tiq_list_lock);
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xchg(irq_ptr->dsci, 1);
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}
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void tiqdio_remove_input_queues(struct qdio_irq *irq_ptr)
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{
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struct qdio_q *q;
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int i;
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for (i = 0; i < irq_ptr->nr_input_qs; i++) {
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q = irq_ptr->input_qs[i];
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/* if establish triggered an error */
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if (!q || !q->entry.prev || !q->entry.next)
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continue;
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mutex_lock(&tiq_list_lock);
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list_del_rcu(&q->entry);
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mutex_unlock(&tiq_list_lock);
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synchronize_rcu();
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}
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}
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static inline int shared_ind(struct qdio_irq *irq_ptr)
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{
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return irq_ptr->dsci == &q_indicators[TIQDIO_SHARED_IND].ind;
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}
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/**
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* tiqdio_thinint_handler - thin interrupt handler for qdio
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* @ind: pointer to adapter local summary indicator
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* @drv_data: NULL
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*/
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static void tiqdio_thinint_handler(void *ind, void *drv_data)
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{
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struct qdio_q *q;
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qdio_perf_stat_inc(&perf_stats.thin_int);
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/*
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* SVS only when needed: issue SVS to benefit from iqdio interrupt
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* avoidance (SVS clears adapter interrupt suppression overwrite)
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*/
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if (!css_qdio_omit_svs)
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do_clear_global_summary();
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/*
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* reset local summary indicator (tiqdio_alsi) to stop adapter
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* interrupts for now
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*/
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xchg((u8 *)ind, 0);
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/* protect tiq_list entries, only changed in activate or shutdown */
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rcu_read_lock();
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/* check for work on all inbound thinint queues */
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list_for_each_entry_rcu(q, &tiq_list, entry)
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/* only process queues from changed sets */
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if (*q->irq_ptr->dsci) {
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/* only clear it if the indicator is non-shared */
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if (!shared_ind(q->irq_ptr))
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xchg(q->irq_ptr->dsci, 0);
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/*
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* don't call inbound processing directly since
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* that could starve other thinint queues
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*/
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tasklet_schedule(&q->tasklet);
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}
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rcu_read_unlock();
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/*
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* if we used the shared indicator clear it now after all queues
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* were processed
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*/
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if (atomic_read(&q_indicators[TIQDIO_SHARED_IND].count)) {
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xchg(&q_indicators[TIQDIO_SHARED_IND].ind, 0);
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/* prevent racing */
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if (*tiqdio_alsi)
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xchg(&q_indicators[TIQDIO_SHARED_IND].ind, 1);
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}
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}
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static int set_subchannel_ind(struct qdio_irq *irq_ptr, int reset)
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{
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struct scssc_area *scssc_area;
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int rc;
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scssc_area = (struct scssc_area *)irq_ptr->chsc_page;
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memset(scssc_area, 0, PAGE_SIZE);
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if (reset) {
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scssc_area->summary_indicator_addr = 0;
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scssc_area->subchannel_indicator_addr = 0;
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} else {
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scssc_area->summary_indicator_addr = virt_to_phys(tiqdio_alsi);
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scssc_area->subchannel_indicator_addr =
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virt_to_phys(irq_ptr->dsci);
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}
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scssc_area->request = (struct chsc_header) {
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.length = 0x0fe0,
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.code = 0x0021,
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};
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scssc_area->operation_code = 0;
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scssc_area->ks = PAGE_DEFAULT_KEY;
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scssc_area->kc = PAGE_DEFAULT_KEY;
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scssc_area->isc = QDIO_AIRQ_ISC;
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scssc_area->schid = irq_ptr->schid;
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/* enable the time delay disablement facility */
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if (css_general_characteristics.aif_tdd)
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scssc_area->word_with_d_bit = 0x10000000;
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rc = chsc(scssc_area);
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if (rc)
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return -EIO;
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rc = chsc_error_from_response(scssc_area->response.code);
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if (rc) {
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DBF_ERROR("%4x SSI r:%4x", irq_ptr->schid.sch_no,
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scssc_area->response.code);
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DBF_ERROR_HEX(&scssc_area->response, sizeof(void *));
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return rc;
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}
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DBF_EVENT("setscind");
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DBF_HEX(&scssc_area->summary_indicator_addr, sizeof(unsigned long));
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DBF_HEX(&scssc_area->subchannel_indicator_addr, sizeof(unsigned long));
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return 0;
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}
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/* allocate non-shared indicators and shared indicator */
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int __init tiqdio_allocate_memory(void)
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{
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q_indicators = kzalloc(sizeof(struct indicator_t) * TIQDIO_NR_INDICATORS,
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GFP_KERNEL);
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if (!q_indicators)
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return -ENOMEM;
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return 0;
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}
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void tiqdio_free_memory(void)
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{
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kfree(q_indicators);
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}
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int __init tiqdio_register_thinints(void)
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{
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isc_register(QDIO_AIRQ_ISC);
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tiqdio_alsi = s390_register_adapter_interrupt(&tiqdio_thinint_handler,
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NULL, QDIO_AIRQ_ISC);
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if (IS_ERR(tiqdio_alsi)) {
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DBF_EVENT("RTI:%lx", PTR_ERR(tiqdio_alsi));
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tiqdio_alsi = NULL;
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isc_unregister(QDIO_AIRQ_ISC);
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return -ENOMEM;
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}
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return 0;
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}
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int qdio_establish_thinint(struct qdio_irq *irq_ptr)
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{
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if (!is_thinint_irq(irq_ptr))
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return 0;
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/* Check for aif time delay disablement. If installed,
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* omit SVS even under LPAR
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*/
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if (css_general_characteristics.aif_tdd)
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css_qdio_omit_svs = 1;
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return set_subchannel_ind(irq_ptr, 0);
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}
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void qdio_setup_thinint(struct qdio_irq *irq_ptr)
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{
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if (!is_thinint_irq(irq_ptr))
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return;
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irq_ptr->dsci = get_indicator();
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DBF_HEX(&irq_ptr->dsci, sizeof(void *));
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}
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void qdio_shutdown_thinint(struct qdio_irq *irq_ptr)
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{
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if (!is_thinint_irq(irq_ptr))
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return;
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/* reset adapter interrupt indicators */
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put_indicator(irq_ptr->dsci);
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set_subchannel_ind(irq_ptr, 1);
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}
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void __exit tiqdio_unregister_thinints(void)
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{
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WARN_ON(!list_empty(&tiq_list));
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if (tiqdio_alsi) {
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s390_unregister_adapter_interrupt(tiqdio_alsi, QDIO_AIRQ_ISC);
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isc_unregister(QDIO_AIRQ_ISC);
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}
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}
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