1 /* 2 * SCLP early driver 3 * 4 * Copyright IBM Corp. 2013 5 */ 6 7 #define KMSG_COMPONENT "sclp_early" 8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 9 10 #include <linux/errno.h> 11 #include <asm/ctl_reg.h> 12 #include <asm/sclp.h> 13 #include <asm/ipl.h> 14 #include "sclp_sdias.h" 15 #include "sclp.h" 16 17 #define SCLP_CMDW_READ_SCP_INFO 0x00020001 18 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001 19 20 struct read_info_sccb { 21 struct sccb_header header; /* 0-7 */ 22 u16 rnmax; /* 8-9 */ 23 u8 rnsize; /* 10 */ 24 u8 _pad_11[16 - 11]; /* 11-15 */ 25 u16 ncpurl; /* 16-17 */ 26 u16 cpuoff; /* 18-19 */ 27 u8 _pad_20[24 - 20]; /* 20-23 */ 28 u8 loadparm[8]; /* 24-31 */ 29 u8 _pad_32[42 - 32]; /* 32-41 */ 30 u8 fac42; /* 42 */ 31 u8 fac43; /* 43 */ 32 u8 _pad_44[48 - 44]; /* 44-47 */ 33 u64 facilities; /* 48-55 */ 34 u8 _pad_56[66 - 56]; /* 56-65 */ 35 u8 fac66; /* 66 */ 36 u8 _pad_67[76 - 67]; /* 67-83 */ 37 u32 ibc; /* 76-79 */ 38 u8 _pad80[84 - 80]; /* 80-83 */ 39 u8 fac84; /* 84 */ 40 u8 fac85; /* 85 */ 41 u8 _pad_86[91 - 86]; /* 86-90 */ 42 u8 flags; /* 91 */ 43 u8 _pad_92[98 - 92]; /* 92-97 */ 44 u8 fac98; /* 98 */ 45 u8 hamaxpow; /* 99 */ 46 u32 rnsize2; /* 100-103 */ 47 u64 rnmax2; /* 104-111 */ 48 u8 _pad_112[116 - 112]; /* 112-115 */ 49 u8 fac116; /* 116 */ 50 u8 fac117; /* 117 */ 51 u8 _pad_118; /* 118 */ 52 u8 fac119; /* 119 */ 53 u16 hcpua; /* 120-121 */ 54 u8 _pad_122[124 - 122]; /* 122-123 */ 55 u32 hmfai; /* 124-127 */ 56 u8 _pad_128[4096 - 128]; /* 128-4095 */ 57 } __packed __aligned(PAGE_SIZE); 58 59 static struct sclp_ipl_info sclp_ipl_info; 60 61 struct sclp_info sclp; 62 EXPORT_SYMBOL(sclp); 63 64 static int __init sclp_early_read_info(struct read_info_sccb *sccb) 65 { 66 int i; 67 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, 68 SCLP_CMDW_READ_SCP_INFO}; 69 70 for (i = 0; i < ARRAY_SIZE(commands); i++) { 71 memset(sccb, 0, sizeof(*sccb)); 72 sccb->header.length = sizeof(*sccb); 73 sccb->header.function_code = 0x80; 74 sccb->header.control_mask[2] = 0x80; 75 if (sclp_early_cmd(commands[i], sccb)) 76 break; 77 if (sccb->header.response_code == 0x10) 78 return 0; 79 if (sccb->header.response_code != 0x1f0) 80 break; 81 } 82 return -EIO; 83 } 84 85 static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb) 86 { 87 struct sclp_core_entry *cpue; 88 u16 boot_cpu_address, cpu; 89 90 if (sclp_early_read_info(sccb)) 91 return; 92 93 sclp.facilities = sccb->facilities; 94 sclp.has_sprp = !!(sccb->fac84 & 0x02); 95 sclp.has_core_type = !!(sccb->fac84 & 0x01); 96 sclp.has_gsls = !!(sccb->fac85 & 0x80); 97 sclp.has_64bscao = !!(sccb->fac116 & 0x80); 98 sclp.has_cmma = !!(sccb->fac116 & 0x40); 99 sclp.has_esca = !!(sccb->fac116 & 0x08); 100 sclp.has_pfmfi = !!(sccb->fac117 & 0x40); 101 sclp.has_ibs = !!(sccb->fac117 & 0x20); 102 sclp.has_hvs = !!(sccb->fac119 & 0x80); 103 sclp.has_kss = !!(sccb->fac98 & 0x01); 104 if (sccb->fac85 & 0x02) 105 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; 106 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; 107 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; 108 sclp.rzm <<= 20; 109 sclp.ibc = sccb->ibc; 110 111 if (sccb->hamaxpow && sccb->hamaxpow < 64) 112 sclp.hamax = (1UL << sccb->hamaxpow) - 1; 113 else 114 sclp.hamax = U64_MAX; 115 116 if (!sccb->hcpua) { 117 if (MACHINE_IS_VM) 118 sclp.max_cores = 64; 119 else 120 sclp.max_cores = sccb->ncpurl; 121 } else { 122 sclp.max_cores = sccb->hcpua + 1; 123 } 124 125 boot_cpu_address = stap(); 126 cpue = (void *)sccb + sccb->cpuoff; 127 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { 128 if (boot_cpu_address != cpue->core_id) 129 continue; 130 sclp.has_siif = cpue->siif; 131 sclp.has_sigpif = cpue->sigpif; 132 sclp.has_sief2 = cpue->sief2; 133 sclp.has_gpere = cpue->gpere; 134 sclp.has_ib = cpue->ib; 135 sclp.has_cei = cpue->cei; 136 sclp.has_skey = cpue->skey; 137 break; 138 } 139 140 /* Save IPL information */ 141 sclp_ipl_info.is_valid = 1; 142 if (sccb->flags & 0x2) 143 sclp_ipl_info.has_dump = 1; 144 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); 145 146 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; 147 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; 148 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; 149 150 sclp.hmfai = sccb->hmfai; 151 } 152 153 /* 154 * This function will be called after sclp_early_facilities_detect(), which gets 155 * called from early.c code. The sclp_early_facilities_detect() function retrieves 156 * and saves the IPL information. 157 */ 158 void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info) 159 { 160 *info = sclp_ipl_info; 161 } 162 163 static struct sclp_core_info sclp_early_core_info __initdata; 164 static int sclp_early_core_info_valid __initdata; 165 166 static void __init sclp_early_init_core_info(struct read_cpu_info_sccb *sccb) 167 { 168 if (!SCLP_HAS_CPU_INFO) 169 return; 170 memset(sccb, 0, sizeof(*sccb)); 171 sccb->header.length = sizeof(*sccb); 172 if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) 173 return; 174 if (sccb->header.response_code != 0x0010) 175 return; 176 sclp_fill_core_info(&sclp_early_core_info, sccb); 177 sclp_early_core_info_valid = 1; 178 } 179 180 int __init sclp_early_get_core_info(struct sclp_core_info *info) 181 { 182 if (!sclp_early_core_info_valid) 183 return -EIO; 184 *info = sclp_early_core_info; 185 return 0; 186 } 187 188 static long __init sclp_early_hsa_size_init(struct sdias_sccb *sccb) 189 { 190 memset(sccb, 0, sizeof(*sccb)); 191 sccb->hdr.length = sizeof(*sccb); 192 sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf); 193 sccb->evbuf.hdr.type = EVTYP_SDIAS; 194 sccb->evbuf.event_qual = SDIAS_EQ_SIZE; 195 sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP; 196 sccb->evbuf.event_id = 4712; 197 sccb->evbuf.dbs = 1; 198 if (sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_DATA, sccb)) 199 return -EIO; 200 if (sccb->hdr.response_code != 0x20) 201 return -EIO; 202 if (sccb->evbuf.blk_cnt == 0) 203 return 0; 204 return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; 205 } 206 207 static long __init sclp_early_hsa_copy_wait(struct sdias_sccb *sccb) 208 { 209 memset(sccb, 0, PAGE_SIZE); 210 sccb->hdr.length = PAGE_SIZE; 211 if (sclp_early_cmd(SCLP_CMDW_READ_EVENT_DATA, sccb)) 212 return -EIO; 213 if ((sccb->hdr.response_code != 0x20) && (sccb->hdr.response_code != 0x220)) 214 return -EIO; 215 if (sccb->evbuf.blk_cnt == 0) 216 return 0; 217 return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; 218 } 219 220 static void __init sclp_early_hsa_size_detect(void *sccb) 221 { 222 unsigned long flags; 223 long size = -EIO; 224 225 raw_local_irq_save(flags); 226 if (sclp_early_set_event_mask(sccb, EVTYP_SDIAS_MASK, EVTYP_SDIAS_MASK)) 227 goto out; 228 size = sclp_early_hsa_size_init(sccb); 229 /* First check for synchronous response (LPAR) */ 230 if (size) 231 goto out_mask; 232 if (!(S390_lowcore.ext_params & 1)) 233 sclp_early_wait_irq(); 234 size = sclp_early_hsa_copy_wait(sccb); 235 out_mask: 236 sclp_early_set_event_mask(sccb, 0, 0); 237 out: 238 raw_local_irq_restore(flags); 239 if (size > 0) 240 sclp.hsa_size = size; 241 } 242 243 static void __init sclp_early_console_detect(struct init_sccb *sccb) 244 { 245 if (sccb->header.response_code != 0x20) 246 return; 247 248 if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) 249 sclp.has_vt220 = 1; 250 251 if (sclp_early_con_check_linemode(sccb)) 252 sclp.has_linemode = 1; 253 } 254 255 void __init sclp_early_detect(void) 256 { 257 void *sccb = &sclp_early_sccb; 258 259 sclp_early_facilities_detect(sccb); 260 sclp_early_init_core_info(sccb); 261 sclp_early_hsa_size_detect(sccb); 262 263 /* 264 * Turn off SCLP event notifications. Also save remote masks in the 265 * sccb. These are sufficient to detect sclp console capabilities. 266 */ 267 sclp_early_set_event_mask(sccb, 0, 0); 268 sclp_early_console_detect(sccb); 269 } 270