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