s390/char/sclp_ap.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * s390 crypto adapter related sclp functions.
0004  *
0005  * Copyright IBM Corp. 2020
0006  */
0007 #define KMSG_COMPONENT "sclp_cmd"
0008 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
0009
0010 #include <linux/export.h>
0011 #include <linux/slab.h>
0012 #include <asm/sclp.h>
0013 #include "sclp.h"
0014
0015 #define SCLP_CMDW_CONFIGURE_AP          0x001f0001
0016 #define SCLP_CMDW_DECONFIGURE_AP        0x001e0001
0017
0018 struct ap_cfg_sccb {
0019     struct sccb_header header;
0020 } __packed;
0021
0022 static int do_ap_configure(sclp_cmdw_t cmd, u32 apid)
0023 {
0024     struct ap_cfg_sccb *sccb;
0025     int rc;
0026
0027     if (!SCLP_HAS_AP_RECONFIG)
0028         return -EOPNOTSUPP;
0029
0030     sccb = (struct ap_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
0031     if (!sccb)
0032         return -ENOMEM;
0033
0034     sccb->header.length = PAGE_SIZE;
0035     cmd |= (apid & 0xFF) << 8;
0036     rc = sclp_sync_request(cmd, sccb);
0037     if (rc)
0038         goto out;
0039     switch (sccb->header.response_code) {
0040     case 0x0020: case 0x0120: case 0x0440: case 0x0450:
0041         break;
0042     default:
0043         pr_warn("configure AP adapter %u failed: cmd=0x%08x response=0x%04x\n",
0044             apid, cmd, sccb->header.response_code);
0045         rc = -EIO;
0046         break;
0047     }
0048 out:
0049     free_page((unsigned long) sccb);
0050     return rc;
0051 }
0052
0053 int sclp_ap_configure(u32 apid)
0054 {
0055     return do_ap_configure(SCLP_CMDW_CONFIGURE_AP, apid);
0056 }
0057 EXPORT_SYMBOL(sclp_ap_configure);
0058
0059 int sclp_ap_deconfigure(u32 apid)
0060 {
0061     return do_ap_configure(SCLP_CMDW_DECONFIGURE_AP, apid);
0062 }
0063 EXPORT_SYMBOL(sclp_ap_deconfigure);