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