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 char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE) __initdata; 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_cmd_sync_early(sclp_cmdw_t cmd, void *sccb) 65 { 66 int rc; 67 68 __ctl_set_bit(0, 9); 69 rc = sclp_service_call(cmd, sccb); 70 if (rc) 71 goto out; 72 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | 73 PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT); 74 local_irq_disable(); 75 out: 76 /* Contents of the sccb might have changed. */ 77 barrier(); 78 __ctl_clear_bit(0, 9); 79 return rc; 80 } 81 82 static int __init sclp_read_info_early(struct read_info_sccb *sccb) 83 { 84 int rc, i; 85 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, 86 SCLP_CMDW_READ_SCP_INFO}; 87 88 for (i = 0; i < ARRAY_SIZE(commands); i++) { 89 do { 90 memset(sccb, 0, sizeof(*sccb)); 91 sccb->header.length = sizeof(*sccb); 92 sccb->header.function_code = 0x80; 93 sccb->header.control_mask[2] = 0x80; 94 rc = sclp_cmd_sync_early(commands[i], sccb); 95 } while (rc == -EBUSY); 96 97 if (rc) 98 break; 99 if (sccb->header.response_code == 0x10) 100 return 0; 101 if (sccb->header.response_code != 0x1f0) 102 break; 103 } 104 return -EIO; 105 } 106 107 static void __init sclp_facilities_detect(struct read_info_sccb *sccb) 108 { 109 struct sclp_core_entry *cpue; 110 u16 boot_cpu_address, cpu; 111 112 if (sclp_read_info_early(sccb)) 113 return; 114 115 sclp.facilities = sccb->facilities; 116 sclp.has_sprp = !!(sccb->fac84 & 0x02); 117 sclp.has_core_type = !!(sccb->fac84 & 0x01); 118 sclp.has_gsls = !!(sccb->fac85 & 0x80); 119 sclp.has_64bscao = !!(sccb->fac116 & 0x80); 120 sclp.has_cmma = !!(sccb->fac116 & 0x40); 121 sclp.has_esca = !!(sccb->fac116 & 0x08); 122 sclp.has_pfmfi = !!(sccb->fac117 & 0x40); 123 sclp.has_ibs = !!(sccb->fac117 & 0x20); 124 sclp.has_hvs = !!(sccb->fac119 & 0x80); 125 if (sccb->fac85 & 0x02) 126 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; 127 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; 128 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; 129 sclp.rzm <<= 20; 130 sclp.ibc = sccb->ibc; 131 132 if (sccb->hamaxpow && sccb->hamaxpow < 64) 133 sclp.hamax = (1UL << sccb->hamaxpow) - 1; 134 else 135 sclp.hamax = U64_MAX; 136 137 if (!sccb->hcpua) { 138 if (MACHINE_IS_VM) 139 sclp.max_cores = 64; 140 else 141 sclp.max_cores = sccb->ncpurl; 142 } else { 143 sclp.max_cores = sccb->hcpua + 1; 144 } 145 146 boot_cpu_address = stap(); 147 cpue = (void *)sccb + sccb->cpuoff; 148 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { 149 if (boot_cpu_address != cpue->core_id) 150 continue; 151 sclp.has_siif = cpue->siif; 152 sclp.has_sigpif = cpue->sigpif; 153 sclp.has_sief2 = cpue->sief2; 154 sclp.has_gpere = cpue->gpere; 155 sclp.has_ib = cpue->ib; 156 sclp.has_cei = cpue->cei; 157 sclp.has_skey = cpue->skey; 158 break; 159 } 160 161 /* Save IPL information */ 162 sclp_ipl_info.is_valid = 1; 163 if (sccb->flags & 0x2) 164 sclp_ipl_info.has_dump = 1; 165 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); 166 167 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; 168 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; 169 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; 170 171 sclp.hmfai = sccb->hmfai; 172 } 173 174 /* 175 * This function will be called after sclp_facilities_detect(), which gets 176 * called from early.c code. The sclp_facilities_detect() function retrieves 177 * and saves the IPL information. 178 */ 179 void __init sclp_get_ipl_info(struct sclp_ipl_info *info) 180 { 181 *info = sclp_ipl_info; 182 } 183 184 static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb) 185 { 186 int rc; 187 188 do { 189 rc = sclp_cmd_sync_early(cmd, sccb); 190 } while (rc == -EBUSY); 191 192 if (rc) 193 return -EIO; 194 if (((struct sccb_header *) sccb)->response_code != 0x0020) 195 return -EIO; 196 return 0; 197 } 198 199 static void __init sccb_init_eq_size(struct sdias_sccb *sccb) 200 { 201 memset(sccb, 0, sizeof(*sccb)); 202 203 sccb->hdr.length = sizeof(*sccb); 204 sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf); 205 sccb->evbuf.hdr.type = EVTYP_SDIAS; 206 sccb->evbuf.event_qual = SDIAS_EQ_SIZE; 207 sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP; 208 sccb->evbuf.event_id = 4712; 209 sccb->evbuf.dbs = 1; 210 } 211 212 static int __init sclp_set_event_mask(struct init_sccb *sccb, 213 unsigned long receive_mask, 214 unsigned long send_mask) 215 { 216 memset(sccb, 0, sizeof(*sccb)); 217 sccb->header.length = sizeof(*sccb); 218 sccb->mask_length = sizeof(sccb_mask_t); 219 sccb->receive_mask = receive_mask; 220 sccb->send_mask = send_mask; 221 return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb); 222 } 223 224 static long __init sclp_hsa_size_init(struct sdias_sccb *sccb) 225 { 226 sccb_init_eq_size(sccb); 227 if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb)) 228 return -EIO; 229 if (sccb->evbuf.blk_cnt == 0) 230 return 0; 231 return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; 232 } 233 234 static long __init sclp_hsa_copy_wait(struct sccb_header *sccb) 235 { 236 memset(sccb, 0, PAGE_SIZE); 237 sccb->length = PAGE_SIZE; 238 if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb)) 239 return -EIO; 240 if (((struct sdias_sccb *) sccb)->evbuf.blk_cnt == 0) 241 return 0; 242 return (((struct sdias_sccb *) sccb)->evbuf.blk_cnt - 1) * PAGE_SIZE; 243 } 244 245 static void __init sclp_hsa_size_detect(void *sccb) 246 { 247 long size; 248 249 /* First try synchronous interface (LPAR) */ 250 if (sclp_set_event_mask(sccb, 0, 0x40000010)) 251 return; 252 size = sclp_hsa_size_init(sccb); 253 if (size < 0) 254 return; 255 if (size != 0) 256 goto out; 257 /* Then try asynchronous interface (z/VM) */ 258 if (sclp_set_event_mask(sccb, 0x00000010, 0x40000010)) 259 return; 260 size = sclp_hsa_size_init(sccb); 261 if (size < 0) 262 return; 263 size = sclp_hsa_copy_wait(sccb); 264 if (size < 0) 265 return; 266 out: 267 sclp.hsa_size = size; 268 } 269 270 static unsigned int __init sclp_con_check_linemode(struct init_sccb *sccb) 271 { 272 if (!(sccb->sclp_send_mask & EVTYP_OPCMD_MASK)) 273 return 0; 274 if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK))) 275 return 0; 276 return 1; 277 } 278 279 static void __init sclp_console_detect(struct init_sccb *sccb) 280 { 281 if (sccb->header.response_code != 0x20) 282 return; 283 284 if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) 285 sclp.has_vt220 = 1; 286 287 if (sclp_con_check_linemode(sccb)) 288 sclp.has_linemode = 1; 289 } 290 291 void __init sclp_early_detect(void) 292 { 293 void *sccb = &sccb_early; 294 295 sclp_facilities_detect(sccb); 296 sclp_hsa_size_detect(sccb); 297 298 /* Turn off SCLP event notifications. Also save remote masks in the 299 * sccb. These are sufficient to detect sclp console capabilities. 300 */ 301 sclp_set_event_mask(sccb, 0, 0); 302 sclp_console_detect(sccb); 303 } 304