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      _pad_118;               /* 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_hvs = !!(sccb->fac119 & 0x80);
 104         sclp.has_kss = !!(sccb->fac98 & 0x01);
 105         if (sccb->fac85 & 0x02)
 106                 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
 107         if (sccb->fac91 & 0x40)
 108                 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST;
 109         sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
 110         sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
 111         sclp.rzm <<= 20;
 112         sclp.ibc = sccb->ibc;
 113
 114         if (sccb->hamaxpow && sccb->hamaxpow < 64)
 115                 sclp.hamax = (1UL << sccb->hamaxpow) - 1;
 116         else
 117                 sclp.hamax = U64_MAX;
 118
 119         if (!sccb->hcpua) {
 120                 if (MACHINE_IS_VM)
 121                         sclp.max_cores = 64;
 122                 else
 123                         sclp.max_cores = sccb->ncpurl;
 124         } else {
 125                 sclp.max_cores = sccb->hcpua + 1;
 126         }
 127
 128         boot_cpu_address = stap();
 129         cpue = (void *)sccb + sccb->cpuoff;
 130         for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
 131                 if (boot_cpu_address != cpue->core_id)
 132                         continue;
 133                 sclp.has_siif = cpue->siif;
 134                 sclp.has_sigpif = cpue->sigpif;
 135                 sclp.has_sief2 = cpue->sief2;
 136                 sclp.has_gpere = cpue->gpere;
 137                 sclp.has_ib = cpue->ib;
 138                 sclp.has_cei = cpue->cei;
 139                 sclp.has_skey = cpue->skey;
 140                 break;
 141         }
 142
 143         /* Save IPL information */
 144         sclp_ipl_info.is_valid = 1;
 145         if (sccb->fac91 & 0x2)
 146                 sclp_ipl_info.has_dump = 1;
 147         memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
 148
 149         sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
 150         sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
 151         sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
 152
 153         sclp.hmfai = sccb->hmfai;
 154 }
 155
 156 /*
 157  * This function will be called after sclp_early_facilities_detect(), which gets
 158  * called from early.c code. The sclp_early_facilities_detect() function retrieves
 159  * and saves the IPL information.
 160  */
 161 void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
 162 {
 163         *info = sclp_ipl_info;
 164 }
 165
 166 static struct sclp_core_info sclp_early_core_info __initdata;
 167 static int sclp_early_core_info_valid __initdata;
 168
 169 static void __init sclp_early_init_core_info(struct read_cpu_info_sccb *sccb)
 170 {
 171         if (!SCLP_HAS_CPU_INFO)
 172                 return;
 173         memset(sccb, 0, sizeof(*sccb));
 174         sccb->header.length = sizeof(*sccb);
 175         if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb))
 176                 return;
 177         if (sccb->header.response_code != 0x0010)
 178                 return;
 179         sclp_fill_core_info(&sclp_early_core_info, sccb);
 180         sclp_early_core_info_valid = 1;
 181 }
 182
 183 int __init sclp_early_get_core_info(struct sclp_core_info *info)
 184 {
 185         if (!sclp_early_core_info_valid)
 186                 return -EIO;
 187         *info = sclp_early_core_info;
 188         return 0;
 189 }
 190
 191 static long __init sclp_early_hsa_size_init(struct sdias_sccb *sccb)
 192 {
 193         memset(sccb, 0, sizeof(*sccb));
 194         sccb->hdr.length = sizeof(*sccb);
 195         sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf);
 196         sccb->evbuf.hdr.type = EVTYP_SDIAS;
 197         sccb->evbuf.event_qual = SDIAS_EQ_SIZE;
 198         sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP;
 199         sccb->evbuf.event_id = 4712;
 200         sccb->evbuf.dbs = 1;
 201         if (sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_DATA, sccb))
 202                 return -EIO;
 203         if (sccb->hdr.response_code != 0x20)
 204                 return -EIO;
 205         if (sccb->evbuf.blk_cnt == 0)
 206                 return 0;
 207         return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
 208 }
 209
 210 static long __init sclp_early_hsa_copy_wait(struct sdias_sccb *sccb)
 211 {
 212         memset(sccb, 0, PAGE_SIZE);
 213         sccb->hdr.length = PAGE_SIZE;
 214         if (sclp_early_cmd(SCLP_CMDW_READ_EVENT_DATA, sccb))
 215                 return -EIO;
 216         if ((sccb->hdr.response_code != 0x20) && (sccb->hdr.response_code != 0x220))
 217                 return -EIO;
 218         if (sccb->evbuf.blk_cnt == 0)
 219                 return 0;
 220         return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
 221 }
 222
 223 static void __init sclp_early_hsa_size_detect(void *sccb)
 224 {
 225         unsigned long flags;
 226         long size = -EIO;
 227
 228         raw_local_irq_save(flags);
 229         if (sclp_early_set_event_mask(sccb, EVTYP_SDIAS_MASK, EVTYP_SDIAS_MASK))
 230                 goto out;
 231         size = sclp_early_hsa_size_init(sccb);
 232         /* First check for synchronous response (LPAR) */
 233         if (size)
 234                 goto out_mask;
 235         if (!(S390_lowcore.ext_params & 1))
 236                 sclp_early_wait_irq();
 237         size = sclp_early_hsa_copy_wait(sccb);
 238 out_mask:
 239         sclp_early_set_event_mask(sccb, 0, 0);
 240 out:
 241         raw_local_irq_restore(flags);
 242         if (size > 0)
 243                 sclp.hsa_size = size;
 244 }
 245
 246 static void __init sclp_early_console_detect(struct init_sccb *sccb)
 247 {
 248         if (sccb->header.response_code != 0x20)
 249                 return;
 250
 251         if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK)
 252                 sclp.has_vt220 = 1;
 253
 254         if (sclp_early_con_check_linemode(sccb))
 255                 sclp.has_linemode = 1;
 256 }
 257
 258 void __init sclp_early_detect(void)
 259 {
 260         void *sccb = &sclp_early_sccb;
 261
 262         sclp_early_facilities_detect(sccb);
 263         sclp_early_init_core_info(sccb);
 264         sclp_early_hsa_size_detect(sccb);
 265
 266         /*
 267          * Turn off SCLP event notifications.  Also save remote masks in the
 268          * sccb.  These are sufficient to detect sclp console capabilities.
 269          */
 270         sclp_early_set_event_mask(sccb, 0, 0);
 271         sclp_early_console_detect(sccb);
 272 }