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 (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) 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 } 274