path: root/drivers/s390/crypto/ap_queue.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright IBM Corp. 2016, 2023
 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
 *
 * Adjunct processor bus, queue related code.
 */

#define pr_fmt(fmt) "ap: " fmt

#include <linux/export.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <asm/facility.h>

#define CREATE_TRACE_POINTS
#include <asm/trace/ap.h>

#include "ap_bus.h"
#include "ap_debug.h"

EXPORT_TRACEPOINT_SYMBOL(s390_ap_nqap);
EXPORT_TRACEPOINT_SYMBOL(s390_ap_dqap);

static void __ap_flush_queue(struct ap_queue *aq);

/*
 * some AP queue helper functions
 */

static inline bool ap_q_supported_in_se(struct ap_queue *aq)
{
	return aq->card->hwinfo.ep11 || aq->card->hwinfo.accel;
}

static inline bool ap_q_supports_bind(struct ap_queue *aq)
{
	return aq->card->hwinfo.ep11 || aq->card->hwinfo.accel;
}

static inline bool ap_q_supports_assoc(struct ap_queue *aq)
{
	return aq->card->hwinfo.ep11;
}

static inline bool ap_q_needs_bind(struct ap_queue *aq)
{
	return ap_q_supports_bind(aq) && ap_sb_available();
}

/**
 * ap_queue_enable_irq(): Enable interrupt support on this AP queue.
 * @aq: The AP queue
 * @ind: the notification indicator byte
 *
 * Enables interruption on AP queue via ap_aqic(). Based on the return
 * value it waits a while and tests the AP queue if interrupts
 * have been switched on using ap_test_queue().
 */
static int ap_queue_enable_irq(struct ap_queue *aq, void *ind)
{
	union ap_qirq_ctrl qirqctrl = { .value = 0 };
	struct ap_queue_status status;

	qirqctrl.ir = 1;
	qirqctrl.isc = AP_ISC;
	status = ap_aqic(aq->