drivers/s390/char/sclp_early.c

   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
  21 static struct sclp_ipl_info sclp_ipl_info;
  22
  23 struct sclp_info sclp;
  24 EXPORT_SYMBOL(sclp);
  25
  26 static 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  */
 110 void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
 111 {
 112         *info = sclp_ipl_info;
 113 }
 114
 115 int __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);
 140 out:
 141         memblock_free_early((unsigned long)sccb, length);
 142         return rc;
 143 }
 144
 145 static 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
 157 void __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 }