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 #define SCLP_CMDW_READ_SCP_INFO         0x00020001
  19 #define SCLP_CMDW_READ_SCP_INFO_FORCED  0x00120001
  20
  21 struct read_info_sccb {
  22         struct  sccb_header header;     /* 0-7 */
  23         u16     rnmax;                  /* 8-9 */
  24         u8      rnsize;                 /* 10 */
  25         u8      _pad_11[16 - 11];       /* 11-15 */
  26         u16     ncpurl;                 /* 16-17 */
  27         u16     cpuoff;                 /* 18-19 */
  28         u8      _pad_20[24 - 20];       /* 20-23 */
  29         u8      loadparm[8];            /* 24-31 */
  30         u8      _pad_32[42 - 32];       /* 32-41 */
  31         u8      fac42;                  /* 42 */
  32         u8      fac43;                  /* 43 */
  33         u8      _pad_44[48 - 44];       /* 44-47 */
  34         u64     facilities;             /* 48-55 */
  35         u8      _pad_56[66 - 56];       /* 56-65 */
  36         u8      fac66;                  /* 66 */
  37         u8      _pad_67[76 - 67];       /* 67-83 */
  38         u32     ibc;                    /* 76-79 */
  39         u8      _pad80[84 - 80];        /* 80-83 */
  40         u8      fac84;                  /* 84 */
  41         u8      fac85;                  /* 85 */
  42         u8      _pad_86[91 - 86];       /* 86-90 */
  43         u8      fac91;                  /* 91 */
  44         u8      _pad_92[98 - 92];       /* 92-97 */
  45         u8      fac98;                  /* 98 */
  46         u8      hamaxpow;               /* 99 */
  47         u32     rnsize2;                /* 100-103 */
  48         u64     rnmax2;                 /* 104-111 */
  49         u8      _pad_112[116 - 112];    /* 112-115 */
  50         u8      fac116;                 /* 116 */
  51         u8      fac117;                 /* 117 */
  52         u8      fac118;                 /* 118 */
  53         u8      fac119;                 /* 119 */
  54         u16     hcpua;                  /* 120-121 */
  55         u8      _pad_122[124 - 122];    /* 122-123 */
  56         u32     hmfai;                  /* 124-127 */
  57         u8      _pad_128[4096 - 128];   /* 128-4095 */
  58 } __packed __aligned(PAGE_SIZE);
  59
  60 static struct sclp_ipl_info sclp_ipl_info;
  61
  62 struct sclp_info sclp;
  63 EXPORT_SYMBOL(sclp);
  64
  65 static int __init sclp_early_read_info(struct read_info_sccb *sccb)
  66 {
  67         int i;
  68         sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
  69                                   SCLP_CMDW_READ_SCP_INFO};
  70
  71         for (i = 0; i < ARRAY_SIZE(commands); i++) {
  72                 memset(sccb, 0, sizeof(*sccb));
  73                 sccb->header.length = sizeof(*sccb);
  74                 sccb->header.function_code = 0x80;
  75                 sccb->header.control_mask[2] = 0x80;
  76                 if (sclp_early_cmd(commands[i], sccb))
  77                         break;
  78                 if (sccb->header.response_code == 0x10)
  79                         return 0;
  80                 if (sccb->header.response_code != 0x1f0)
  81                         break;
  82         }
  83         return -EIO;
  84 }
  85
  86 static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb)
  87 {
  88         struct sclp_core_entry *cpue;
  89         u16 boot_cpu_address, cpu;
  90
  91         if (sclp_early_read_info(sccb))
  92                 return;
  93
  94         sclp.facilities = sccb->facilities;
  95         sclp.has_sprp = !!(sccb->fac84 & 0x02);
  96         sclp.has_core_type = !!(sccb->fac84 & 0x01);
  97         sclp.has_gsls = !!(sccb->fac85 & 0x80);
  98         sclp.has_64bscao = !!(sccb->fac116 & 0x80);
  99         sclp.has_cmma = !!(sccb->fac116 & 0x40);
 100         sclp.has_esca = !!(sccb->fac116 & 0x08);
 101         sclp.has_pfmfi = !!(sccb->fac117 & 0x40);
 102         sclp.has_ibs = !!(sccb->fac117 & 0x20);
 103         sclp.has_gisaf = !!(sccb->fac118 & 0x08);
 104         sclp.has_hvs = !!(sccb->fac119 & 0x80);
 105         sclp.has_kss = !!(sccb->fac98 & 0x01);
 106         if (sccb->fac85 & 0x02)
 107                 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
 108         if (sccb->fac91 & 0x40)
 109                 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST;
 110         sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
 111         sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
 112         sclp.rzm <<= 20;
 113         sclp.ibc = sccb->ibc;
 114
 115         if (sccb->hamaxpow && sccb->hamaxpow < 64)
 116                 sclp.hamax = (1UL << sccb->hamaxpow) - 1;
 117         else
 118                 sclp.hamax = U64_MAX;
 119
 120         if (!sccb->hcpua) {
 121                 if (MACHINE_IS_VM)
 122                         sclp.max_cores = 64;
 123                 else
 124                         sclp.max_cores = sccb->ncpurl;
 125         } else {
 126                 sclp.max_cores = sccb->hcpua + 1;
 127         }
 128
 129         boot_cpu_address = stap();
 130         cpue = (void *)sccb + sccb->cpuoff;
 131         for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
 132                 if (boot_cpu_address != cpue->core_id)
 133                         continue;
 134                 sclp.has_siif = cpue->siif;
 135                 sclp.has_sigpif = cpue->sigpif;
 136                 sclp.has_sief2 = cpue->sief2;
 137                 sclp.has_gpere = cpue->gpere;
 138                 sclp.has_ib = cpue->ib;
 139                 sclp.has_cei = cpue->cei;
 140                 sclp.has_skey = cpue->skey;
 141                 break;
 142         }
 143
 144         /* Save IPL information */
 145         sclp_ipl_info.is_valid = 1;
 146         if (sccb->fac91 & 0x2)
 147                 sclp_ipl_info.has_dump = 1;
 148         memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
 149
 150         sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
 151         sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
 152         sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
 153
 154         sclp.hmfai = sccb->hmfai;
 155 }
 156
 157 /*
 158  * This function will be called after sclp_early_facilities_detect(), which gets
 159  * called from early.c code. The sclp_early_facilities_detect() function retrieves
 160  * and saves the IPL information.
 161  */
 162 void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
 163 {
 164         *info = sclp_ipl_info;
 165 }
 166
 167 static struct sclp_core_info sclp_early_core_info __initdata;
 168 static int sclp_early_core_info_valid __initdata;
 169
 170 static void __init sclp_early_init_core_info(struct read_cpu_info_sccb *sccb)
 171 {
 172         if (!SCLP_HAS_CPU_INFO)
 173                 return;
 174         memset(sccb, 0, sizeof(*sccb));
 175         sccb->header.length = sizeof(*sccb);
 176         if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb))
 177                 return;
 178         if (sccb->header.response_code != 0x0010)
 179                 return;
 180         sclp_fill_core_info(&sclp_early_core_info, sccb);
 181         sclp_early_core_info_valid = 1;
 182 }
 183
 184 int __init sclp_early_get_core_info(struct sclp_core_info *info)
 185 {
 186         if (!sclp_early_core_info_valid)
 187                 return -EIO;
 188         *info = sclp_early_core_info;
 189         return 0;
 190 }
 191
 192 static long __init sclp_early_hsa_size_init(struct sdias_sccb *sccb)
 193 {
 194         memset(sccb, 0, sizeof(*sccb));
 195         sccb->hdr.length = sizeof(*sccb);
 196         sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf);
 197         sccb->evbuf.hdr.type = EVTYP_SDIAS;
 198         sccb->evbuf.event_qual = SDIAS_EQ_SIZE;
 199         sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP;
 200         sccb->evbuf.event_id = 4712;
 201         sccb->evbuf.dbs = 1;
 202         if (sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_DATA, sccb))
 203                 return -EIO;
 204         if (sccb->hdr.response_code != 0x20)
 205                 return -EIO;
 206         if (sccb->evbuf.blk_cnt == 0)
 207                 return 0;
 208         return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
 209 }
 210
 211 static long __init sclp_early_hsa_copy_wait(struct sdias_sccb *sccb)
 212 {
 213         memset(sccb, 0, PAGE_SIZE);
 214         sccb->hdr.length = PAGE_SIZE;
 215         if (sclp_early_cmd(SCLP_CMDW_READ_EVENT_DATA, sccb))
 216                 return -EIO;
 217         if ((sccb->hdr.response_code != 0x20) && (sccb->hdr.response_code != 0x220))
 218                 return -EIO;
 219         if (sccb->evbuf.blk_cnt == 0)
 220                 return 0;
 221         return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
 222 }
 223
 224 static void __init sclp_early_hsa_size_detect(void *sccb)
 225 {
 226         unsigned long flags;
 227         long size = -EIO;
 228
 229         raw_local_irq_save(flags);
 230         if (sclp_early_set_event_mask(sccb, EVTYP_SDIAS_MASK, EVTYP_SDIAS_MASK))
 231                 goto out;
 232         size = sclp_early_hsa_size_init(sccb);
 233         /* First check for synchronous response (LPAR) */
 234         if (size)
 235                 goto out_mask;
 236         if (!(S390_lowcore.ext_params & 1))
 237                 sclp_early_wait_irq();
 238         size = sclp_early_hsa_copy_wait(sccb);
 239 out_mask:
 240         sclp_early_set_event_mask(sccb, 0, 0);
 241 out:
 242         raw_local_irq_restore(flags);
 243         if (size > 0)
 244                 sclp.hsa_size = size;
 245 }
 246
 247 static void __init sclp_early_console_detect(struct init_sccb *sccb)
 248 {
 249         if (sccb->header.response_code != 0x20)
 250                 return;
 251
 252         if (sclp_early_con_check_vt220(sccb))
 253                 sclp.has_vt220 = 1;
 254
 255         if (sclp_early_con_check_linemode(sccb))
 256                 sclp.has_linemode = 1;
 257 }
 258
 259 void __init sclp_early_detect(void)
 260 {
 261         void *sccb = &sclp_early_sccb;
 262
 263         sclp_early_facilities_detect(sccb);
 264         sclp_early_init_core_info(sccb);
 265         sclp_early_hsa_size_detect(sccb);
 266
 267         /*
 268          * Turn off SCLP event notifications.  Also save remote masks in the
 269          * sccb.  These are sufficient to detect sclp console capabilities.
 270          */
 271         sclp_early_set_event_mask(sccb, 0, 0);
 272         sclp_early_console_detect(sccb);
 273 }