mirror of https://gitee.com/openkylin/linux.git
298 lines
6.6 KiB
C
298 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2000, 2009
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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 <linux/slab.h>
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#include <linux/kernel_stat.h>
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#include <linux/atomic.h>
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#include <linux/rculist.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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/*
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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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/* 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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/* list of thin interrupt input queues */
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static LIST_HEAD(tiq_list);
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static DEFINE_MUTEX(tiq_list_lock);
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/* Adapter interrupt definitions */
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static void tiqdio_thinint_handler(struct airq_struct *airq);
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static struct airq_struct tiqdio_airq = {
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.handler = tiqdio_thinint_handler,
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.isc = QDIO_AIRQ_ISC,
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};
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static struct indicator_t *q_indicators;
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u64 last_ai_time;
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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_cmpxchg(&q_indicators[i].count, 0, 1))
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return &q_indicators[i].ind;
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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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struct indicator_t *ind = container_of(addr, struct indicator_t, ind);
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if (!addr)
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return;
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atomic_dec(&ind->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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mutex_lock(&tiq_list_lock);
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list_add_rcu(&irq_ptr->input_qs[0]->entry, &tiq_list);
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mutex_unlock(&tiq_list_lock);
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xchg(irq_ptr->dsci, 1 << 7);
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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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q = irq_ptr->input_qs[0];
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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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return;
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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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static inline int has_multiple_inq_on_dsci(struct qdio_irq *irq_ptr)
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{
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return irq_ptr->nr_input_qs > 1;
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}
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static inline int references_shared_dsci(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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static inline int shared_ind(struct qdio_irq *irq_ptr)
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{
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return references_shared_dsci(irq_ptr) ||
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has_multiple_inq_on_dsci(irq_ptr);
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}
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void clear_nonshared_ind(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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if (shared_ind(irq_ptr))
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return;
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xchg(irq_ptr->dsci, 0);
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}
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int test_nonshared_ind(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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if (shared_ind(irq_ptr))
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return 0;
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if (*irq_ptr->dsci)
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return 1;
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else
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return 0;
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}
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static inline u32 clear_shared_ind(void)
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{
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if (!atomic_read(&q_indicators[TIQDIO_SHARED_IND].count))
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return 0;
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return xchg(&q_indicators[TIQDIO_SHARED_IND].ind, 0);
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}
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static inline void tiqdio_call_inq_handlers(struct qdio_irq *irq)
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{
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struct qdio_q *q;
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int i;
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if (!references_shared_dsci(irq) &&
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has_multiple_inq_on_dsci(irq))
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xchg(irq->dsci, 0);
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for_each_input_queue(irq, q, i) {
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if (q->u.in.queue_start_poll) {
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/* skip if polling is enabled or already in work */
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if (test_and_set_bit(QDIO_QUEUE_IRQS_DISABLED,
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&q->u.in.queue_irq_state)) {
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qperf_inc(q, int_discarded);
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continue;
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}
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/* avoid dsci clear here, done after processing */
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q->u.in.queue_start_poll(irq->cdev, q->nr,
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irq->int_parm);
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} else {
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if (!shared_ind(irq))
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xchg(irq->dsci, 0);
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/*
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* Call inbound processing but not directly
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* since 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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}
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}
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/**
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* tiqdio_thinint_handler - thin interrupt handler for qdio
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* @airq: pointer to adapter interrupt descriptor
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*/
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static void tiqdio_thinint_handler(struct airq_struct *airq)
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{
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u32 si_used = clear_shared_ind();
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struct qdio_q *q;
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last_ai_time = S390_lowcore.int_clock;
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inc_irq_stat(IRQIO_QAI);
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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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struct qdio_irq *irq;
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/* only process queues from changed sets */
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irq = q->irq_ptr;
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if (unlikely(references_shared_dsci(irq))) {
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if (!si_used)
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continue;
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} else if (!*irq->dsci)
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continue;
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tiqdio_call_inq_handlers(irq);
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qperf_inc(q, adapter_int);
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}
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rcu_read_unlock();
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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 chsc_scssc_area *scssc = (void *)irq_ptr->chsc_page;
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u64 summary_indicator_addr, subchannel_indicator_addr;
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int rc;
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if (reset) {
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summary_indicator_addr = 0;
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subchannel_indicator_addr = 0;
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} else {
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summary_indicator_addr = virt_to_phys(tiqdio_airq.lsi_ptr);
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subchannel_indicator_addr = virt_to_phys(irq_ptr->dsci);
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}
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rc = chsc_sadc(irq_ptr->schid, scssc, summary_indicator_addr,
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subchannel_indicator_addr);
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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->response.code);
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goto out;
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}
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DBF_EVENT("setscind");
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DBF_HEX(&summary_indicator_addr, sizeof(summary_indicator_addr));
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DBF_HEX(&subchannel_indicator_addr, sizeof(subchannel_indicator_addr));
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out:
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return rc;
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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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int rc;
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rc = register_adapter_interrupt(&tiqdio_airq);
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if (rc) {
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DBF_EVENT("RTI:%x", rc);
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return rc;
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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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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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set_subchannel_ind(irq_ptr, 1);
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put_indicator(irq_ptr->dsci);
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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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unregister_adapter_interrupt(&tiqdio_airq);
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}
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