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 } 273