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