linux/drivers/s390/char/sclp_early.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * SCLP early driver
   4 *
   5 * Copyright IBM Corp. 2013
   6 */
   7
   8#define KMSG_COMPONENT "sclp_early"
   9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  10
  11#include <linux/errno.h>
  12#include <linux/memblock.h>
  13#include <asm/ctl_reg.h>
  14#include <asm/sclp.h>
  15#include <asm/ipl.h>
  16#include <asm/setup.h>
  17#include <asm/facility.h>
  18#include "sclp_sdias.h"
  19#include "sclp.h"
  20
  21static struct sclp_ipl_info sclp_ipl_info;
  22
  23struct sclp_info sclp;
  24EXPORT_SYMBOL(sclp);
  25
  26static void __init sclp_early_facilities_detect(void)
  27{
  28        struct sclp_core_entry *cpue;
  29        struct read_info_sccb *sccb;
  30        u16 boot_cpu_address, cpu;
  31
  32        sccb = sclp_early_get_info();
  33        if (!sccb)
  34                return;
  35
  36        sclp.facilities = sccb->facilities;
  37        sclp.has_sprp = !!(sccb->fac84 & 0x02);
  38        sclp.has_core_type = !!(sccb->fac84 & 0x01);
  39        sclp.has_gsls = !!(sccb->fac85 & 0x80);
  40        sclp.has_64bscao = !!(sccb->fac116 & 0x80);
  41        sclp.has_cmma = !!(sccb->fac116 & 0x40);
  42        sclp.has_esca = !!(sccb->fac116 & 0x08);
  43        sclp.has_pfmfi = !!(sccb->fac117 & 0x40);
  44        sclp.has_ibs = !!(sccb->fac117 & 0x20);
  45        sclp.has_gisaf = !!(sccb->fac118 & 0x08);
  46        sclp.has_hvs = !!(sccb->fac119 & 0x80);
  47        sclp.has_kss = !!(sccb->fac98 & 0x01);
  48        sclp.has_sipl = !!(sccb->cbl & 0x4000);
  49        if (sccb->fac85 & 0x02)
  50                S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
  51        if (sccb->fac91 & 0x40)
  52                S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST;
  53        if (sccb->cpuoff > 134)
  54                sclp.has_diag318 = !!(sccb->byte_134 & 0x80);
  55        sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
  56        sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
  57        sclp.rzm <<= 20;
  58        sclp.ibc = sccb->ibc;
  59
  60        if (sccb->hamaxpow && sccb->hamaxpow < 64)
  61                sclp.hamax = (1UL << sccb->hamaxpow) - 1;
  62        else
  63                sclp.hamax = U64_MAX;
  64
  65        if (!sccb->hcpua) {
  66                if (MACHINE_IS_VM)
  67                        sclp.max_cores = 64;
  68                else
  69                        sclp.max_cores = sccb->ncpurl;
  70        } else {
  71                sclp.max_cores = sccb->hcpua + 1;
  72        }
  73
  74        boot_cpu_address = stap();
  75        cpue = (void *)sccb + sccb->cpuoff;
  76        for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
  77                if (boot_cpu_address != cpue->core_id)
  78                        continue;
  79                sclp.has_siif = cpue->siif;
  80                sclp.has_sigpif = cpue->sigpif;
  81                sclp.has_sief2 = cpue->sief2;
  82                sclp.has_gpere = cpue->gpere;
  83                sclp.has_ib = cpue->ib;
  84                sclp.has_cei = cpue->cei;
  85                sclp.has_skey = cpue->skey;
  86                break;
  87        }
  88
  89        /* Save IPL information */
  90        sclp_ipl_info.is_valid = 1;
  91        if (sccb->fac91 & 0x2)
  92                sclp_ipl_info.has_dump = 1;
  93        memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
  94
  95        if (sccb->hsa_size)
  96                sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE;
  97        sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
  98        sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
  99        sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
 100
 101        sclp.hmfai = sccb->hmfai;
 102        sclp.has_dirq = !!(sccb->cpudirq & 0x80);
 103}
 104
 105/*
 106 * This function will be called after sclp_early_facilities_detect(), which gets
 107 * called from early.c code. The sclp_early_facilities_detect() function retrieves
 108 * and saves the IPL information.
 109 */
 110void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
 111{
 112        *info = sclp_ipl_info;
 113}
 114
 115int __init sclp_early_get_core_info(struct sclp_core_info *info)
 116{
 117        struct read_cpu_info_sccb *sccb;
 118        int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
 119        int rc = 0;
 120
 121        if (!SCLP_HAS_CPU_INFO)
 122                return -EOPNOTSUPP;
 123
 124        sccb = memblock_alloc_low(length, PAGE_SIZE);
 125        if (!sccb)
 126                return -ENOMEM;
 127
 128        memset(sccb, 0, length);
 129        sccb->header.length = length;
 130        sccb->header.control_mask[2] = 0x80;
 131        if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) {
 132                rc = -EIO;
 133                goto out;
 134        }
 135        if (sccb->header.response_code != 0x0010) {
 136                rc = -EIO;
 137                goto out;
 138        }
 139        sclp_fill_core_info(info, sccb);
 140out:
 141        memblock_free_early((unsigned long)sccb, length);
 142        return rc;
 143}
 144
 145static void __init sclp_early_console_detect(struct init_sccb *sccb)
 146{
 147        if (sccb->header.response_code != 0x20)
 148                return;
 149
 150        if (sclp_early_con_check_vt220(sccb))
 151                sclp.has_vt220 = 1;
 152
 153        if (sclp_early_con_check_linemode(sccb))
 154                sclp.has_linemode = 1;
 155}
 156
 157void __init sclp_early_detect(void)
 158{
 159        void *sccb = sclp_early_sccb;
 160
 161        sclp_early_facilities_detect();
 162
 163        /*
 164         * Turn off SCLP event notifications.  Also save remote masks in the
 165         * sccb.  These are sufficient to detect sclp console capabilities.
 166         */
 167        sclp_early_set_event_mask(sccb, 0, 0);
 168        sclp_early_console_detect(sccb);
 169}
 170