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0671cc1048
Add support for AP bus adapter config and deconfig to the sclp core code. The code is statically build into the kernel when ZCRYPT is configured either as module or with static support. This is the base functionality for having configure/deconfigure support in the AP bus and card code. Another patch will exploit this soon. Signed-off-by: Harald Freudenberger <freude@linux.ibm.com> Suggested-by: Pierre Morel <pmorel@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
// 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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