// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * SPU local store allocation routines
 *
 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
 */

#undef DEBUG

#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>

#include <asm/spu.h>
#include <asm/spu_csa.h>
#include <asm/mmu.h>

#include "spufs.h"

int spu_alloc_lscsa(struct spu_state *csa)
{
        struct spu_lscsa *lscsa;
        unsigned char *p;

        lscsa = vzalloc(sizeof(*lscsa));
        if (!lscsa)
                return -ENOMEM;
        csa->lscsa = lscsa;

        /* Set LS pages reserved to allow for user-space mapping. */
        for (p = lscsa->ls; p < lscsa->ls + LS_SIZE; p += PAGE_SIZE)
                SetPageReserved(vmalloc_to_page(p));

        return 0;
}

void spu_free_lscsa(struct spu_state *csa)
{
        /* Clear reserved bit before vfree. */
        unsigned char *p;

        if (csa->lscsa == NULL)
                return;

        for (p = csa->lscsa->ls; p < csa->lscsa->ls + LS_SIZE; p += PAGE_SIZE)
                ClearPageReserved(vmalloc_to_page(p));

        vfree(csa->lscsa);
}