source: mainline/kernel/arch/sparc64/src/trap/sun4v/interrupt.c@ 05882233

/*
 * Copyright (c) 2009 Pavel Rimsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup sparc64interrupt
 * @{
 */
/** @file
 */

#include <arch/interrupt.h>
#include <arch/trap/interrupt.h>
#include <arch/sparc64.h>
#include <interrupt.h>
#include <ddi/irq.h>
#include <stdint.h>
#include <debug.h>
#include <arch/asm.h>
#include <barrier.h>
#include <log.h>
#include <arch.h>
#include <mm/tlb.h>
#include <config.h>
#include <synch/spinlock.h>
#include <arch/sun4v/hypercall.h>

/** number of uint64_t-s in one CPU mondo message */
#define CPU_MONDO_ENTRY_SIZE    8

/** number of entries (messages) in the CPU mondo queue */
#define CPU_MONDO_NENTRIES      8

/** number of uint64_t-s in the CPU mondo queue */
#define CPU_MONDO_QUEUE_SIZE    ((CPU_MONDO_NENTRIES) * (CPU_MONDO_ENTRY_SIZE))

/** used to identify CPU mondo queue in the hypercall */
#define CPU_MONDO_QUEUE_ID      0x3c

/** ASI for reading/writing CPU mondo head/tail registers */
#define ASI_QUEUE               0x25

/** VA for reading the CPU mondo tail */
#define VA_CPU_MONDO_QUEUE_TAIL 0x3c8

/** VA for reading/writing the CPU mondo head */
#define VA_CPU_MONDO_QUEUE_HEAD 0x3c0

/**
 * array which contains CPU mondo queue for every CPU
 */
uint64_t cpu_mondo_queues[MAX_NUM_STRANDS][CPU_MONDO_QUEUE_SIZE]
    __attribute__((aligned(CPU_MONDO_QUEUE_SIZE * sizeof(uint64_t))));

/**
 * Initializes CPU mondo queue for the current CPU.
 */
void sun4v_ipi_init(void)
{
        if (__hypercall_fast3(
            CPU_QCONF,
            CPU_MONDO_QUEUE_ID,
            KA2PA(cpu_mondo_queues[CPU->id]),
            CPU_MONDO_NENTRIES) != HV_EOK)
                panic("Initializing mondo queue failed on CPU %" PRIu64 ".\n",
                    CPU->arch.id);
}

/**
 * Handler of the CPU Mondo trap. Reads the message queue, updates the head
 * register and processes the message (invokes a function call).
 */
void cpu_mondo(unsigned int tt, istate_t *istate)
{
#ifdef CONFIG_SMP
        unsigned int tail = asi_u64_read(ASI_QUEUE, VA_CPU_MONDO_QUEUE_TAIL);
        unsigned int head = asi_u64_read(ASI_QUEUE, VA_CPU_MONDO_QUEUE_HEAD);

        while (head != tail) {
                uint64_t data1 = cpu_mondo_queues[CPU->id][0];

                head = (head + CPU_MONDO_ENTRY_SIZE * sizeof(uint64_t)) %
                    (CPU_MONDO_QUEUE_SIZE * sizeof(uint64_t));
                asi_u64_write(ASI_QUEUE, VA_CPU_MONDO_QUEUE_HEAD, head);

                if (data1 == (uintptr_t) tlb_shootdown_ipi_recv) {
                        ((void (*)(void)) data1)();
                } else {
                        log(LF_ARCH, LVL_DEBUG, "Spurious interrupt on %" PRIu64
                            ", data = %" PRIx64 ".", CPU->arch.id, data1);
                }
        }
#endif
}

/** @}
 */