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