64 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * s390 crypto adapter related sclp functions.4 *5 * Copyright IBM Corp. 20206 */7#define KMSG_COMPONENT "sclp_cmd"8#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt9 10#include <linux/export.h>11#include <linux/slab.h>12#include <asm/sclp.h>13#include "sclp.h"14 15#define SCLP_CMDW_CONFIGURE_AP 0x001f000116#define SCLP_CMDW_DECONFIGURE_AP 0x001e000117 18struct ap_cfg_sccb {19 struct sccb_header header;20} __packed;21 22static int do_ap_configure(sclp_cmdw_t cmd, u32 apid)23{24 struct ap_cfg_sccb *sccb;25 int rc;26 27 if (!SCLP_HAS_AP_RECONFIG)28 return -EOPNOTSUPP;29 30 sccb = (struct ap_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);31 if (!sccb)32 return -ENOMEM;33 34 sccb->header.length = PAGE_SIZE;35 cmd |= (apid & 0xFF) << 8;36 rc = sclp_sync_request(cmd, sccb);37 if (rc)38 goto out;39 switch (sccb->header.response_code) {40 case 0x0020: case 0x0120: case 0x0440: case 0x0450:41 break;42 default:43 pr_warn("configure AP adapter %u failed: cmd=0x%08x response=0x%04x\n",44 apid, cmd, sccb->header.response_code);45 rc = -EIO;46 break;47 }48out:49 free_page((unsigned long) sccb);50 return rc;51}52 53int sclp_ap_configure(u32 apid)54{55 return do_ap_configure(SCLP_CMDW_CONFIGURE_AP, apid);56}57EXPORT_SYMBOL(sclp_ap_configure);58 59int sclp_ap_deconfigure(u32 apid)60{61 return do_ap_configure(SCLP_CMDW_DECONFIGURE_AP, apid);62}63EXPORT_SYMBOL(sclp_ap_deconfigure);64