forked from Minki/linux
64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* s390 crypto adapter related sclp functions.
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*
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* Copyright IBM Corp. 2020
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*/
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#define KMSG_COMPONENT "sclp_cmd"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <asm/sclp.h>
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#include "sclp.h"
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#define SCLP_CMDW_CONFIGURE_AP 0x001f0001
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#define SCLP_CMDW_DECONFIGURE_AP 0x001e0001
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struct ap_cfg_sccb {
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struct sccb_header header;
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} __packed;
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static int do_ap_configure(sclp_cmdw_t cmd, u32 apid)
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{
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struct ap_cfg_sccb *sccb;
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int rc;
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if (!SCLP_HAS_AP_RECONFIG)
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return -EOPNOTSUPP;
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sccb = (struct ap_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
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if (!sccb)
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return -ENOMEM;
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sccb->header.length = PAGE_SIZE;
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cmd |= (apid & 0xFF) << 8;
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rc = sclp_sync_request(cmd, sccb);
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if (rc)
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goto out;
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switch (sccb->header.response_code) {
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case 0x0020: case 0x0120: case 0x0440: case 0x0450:
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break;
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default:
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pr_warn("configure AP adapter %u failed: cmd=0x%08x response=0x%04x\n",
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apid, cmd, sccb->header.response_code);
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rc = -EIO;
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break;
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}
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out:
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free_page((unsigned long) sccb);
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return rc;
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}
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int sclp_ap_configure(u32 apid)
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{
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return do_ap_configure(SCLP_CMDW_CONFIGURE_AP, apid);
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}
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EXPORT_SYMBOL(sclp_ap_configure);
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int sclp_ap_deconfigure(u32 apid)
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{
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return do_ap_configure(SCLP_CMDW_DECONFIGURE_AP, apid);
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}
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EXPORT_SYMBOL(sclp_ap_deconfigure);
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