cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sclp_ap.c (1371B)

      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
     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);