drivers/s390/char/sclp_ap.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * s390 crypto adapter related sclp functions.
   4  *
   5  * Copyright IBM Corp. 2020
   6  */
   7 #define KMSG_COMPONENT "sclp_cmd"
   8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
   9
  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                  0x001f0001
  16 #define SCLP_CMDW_DECONFIGURE_AP                0x001e0001
  17
  18 struct ap_cfg_sccb {
  19         struct sccb_header header;
  20 } __packed;
  21
  22 static 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         }
  48 out:
  49         free_page((unsigned long) sccb);
  50         return rc;
  51 }
  52
  53 int sclp_ap_configure(u32 apid)
  54 {
  55         return do_ap_configure(SCLP_CMDW_CONFIGURE_AP, apid);
  56 }
  57 EXPORT_SYMBOL(sclp_ap_configure);
  58
  59 int sclp_ap_deconfigure(u32 apid)
  60 {
  61         return do_ap_configure(SCLP_CMDW_DECONFIGURE_AP, apid);
  62 }
  63 EXPORT_SYMBOL(sclp_ap_deconfigure);