// SPDX-License-Identifier: GPL-2.0
/*
 * s390 crypto adapter related sclp functions.
 *
 * Copyright IBM Corp. 2020
 */
#define pr_fmt(fmt) "sclp_cmd: " fmt

#include <linux/export.h>
#include <linux/slab.h>
#include <asm/sclp.h>
#include "sclp.h"

#define SCLP_CMDW_CONFIGURE_AP                  0x001f0001
#define SCLP_CMDW_DECONFIGURE_AP                0x001e0001

struct ap_cfg_sccb {
        struct sccb_header header;
} __packed;

static int do_ap_configure(sclp_cmdw_t cmd, u32 apid)
{
        struct ap_cfg_sccb *sccb;
        int rc;

        if (!SCLP_HAS_AP_RECONFIG)
                return -EOPNOTSUPP;

        sccb = (struct ap_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
        if (!sccb)
                return -ENOMEM;

        sccb->header.length = PAGE_SIZE;
        cmd |= (apid & 0xFF) << 8;
        rc = sclp_sync_request(cmd, sccb);
        if (rc)
                goto out;
        switch (sccb->header.response_code) {
        case 0x0020: case 0x0120: case 0x0440: case 0x0450:
                break;
        default:
                pr_warn("configure AP adapter %u failed: cmd=0x%08x response=0x%04x\n",
                        apid, cmd, sccb->header.response_code);
                rc = -EIO;
                break;
        }
out:
        free_page((unsigned long) sccb);
        return rc;
}

int sclp_ap_configure(u32 apid)
{
        return do_ap_configure(SCLP_CMDW_CONFIGURE_AP, apid);
}
EXPORT_SYMBOL(sclp_ap_configure);

int sclp_ap_deconfigure(u32 apid)
{
        return do_ap_configure(SCLP_CMDW_DECONFIGURE_AP, apid);
}
EXPORT_SYMBOL(sclp_ap_deconfigure);