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 _pad_117[119 - 117]; /* 117-118 */ 50 u8 fac119; /* 119 */ 51 u16 hcpua; /* 120-121 */ 52 u8 _pad_122[124 - 122]; /* 122-123 */ 53 u32 hmfai; /* 124-127 */ 54 u8 _pad_128[4096 - 128]; /* 128-4095 */ 55 } __packed __aligned(PAGE_SIZE); 56 57 static char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE) __initdata; 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_cmd_sync_early(sclp_cmdw_t cmd, void *sccb) 64 { 65 int rc; 66 67 __ctl_set_bit(0, 9); 68 rc = sclp_service_call(cmd, sccb); 69 if (rc) 70 goto out; 71 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | 72 PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT); 73 local_irq_disable(); 74 out: 75 /* Contents of the sccb might have changed. */ 76 barrier(); 77 __ctl_clear_bit(0, 9); 78 return rc; 79 } 80 81 static int __init sclp_read_info_early(struct read_info_sccb *sccb) 82 { 83 int rc, i; 84 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, 85 SCLP_CMDW_READ_SCP_INFO}; 86 87 for (i = 0; i < ARRAY_SIZE(commands); i++) { 88 do { 89 memset(sccb, 0, sizeof(*sccb)); 90 sccb->header.length = sizeof(*sccb); 91 sccb->header.function_code = 0x80; 92 sccb->header.control_mask[2] = 0x80; 93 rc = sclp_cmd_sync_early(commands[i], sccb); 94 } while (rc == -EBUSY); 95 96 if (rc) 97 break; 98 if (sccb->header.response_code == 0x10) 99 return 0; 100 if (sccb->header.response_code != 0x1f0) 101 break; 102 } 103 return -EIO; 104 } 105 106 static void __init sclp_facilities_detect(struct read_info_sccb *sccb) 107 { 108 struct sclp_core_entry *cpue; 109 u16 boot_cpu_address, cpu; 110 111 if (sclp_read_info_early(sccb)) 112 return; 113 114 sclp.facilities = sccb->facilities; 115 sclp.has_sprp = !!(sccb->fac84 & 0x02); 116 sclp.has_core_type = !!(sccb->fac84 & 0x01); 117 sclp.has_esca = !!(sccb->fac116 & 0x08); 118 sclp.has_hvs = !!(sccb->fac119 & 0x80); 119 if (sccb->fac85 & 0x02) 120 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; 121 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; 122 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; 123 sclp.rzm <<= 20; 124 sclp.ibc = sccb->ibc; 125 126 if (sccb->hamaxpow && sccb->hamaxpow < 64) 127 sclp.hamax = (1UL << sccb->hamaxpow) - 1; 128 else 129 sclp.hamax = U64_MAX; 130 131 if (!sccb->hcpua) { 132 if (MACHINE_IS_VM) 133 sclp.max_cores = 64; 134 else 135 sclp.max_cores = sccb->ncpurl; 136 } else { 137 sclp.max_cores = sccb->hcpua + 1; 138 } 139 140 boot_cpu_address = stap(); 141 cpue = (void *)sccb + sccb->cpuoff; 142 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { 143 if (boot_cpu_address != cpue->core_id) 144 continue; 145 sclp.has_siif = cpue->siif; 146 sclp.has_sigpif = cpue->sigpif; 147 sclp.has_sief2 = cpue->sief2; 148 break; 149 } 150 151 /* Save IPL information */ 152 sclp_ipl_info.is_valid = 1; 153 if (sccb->flags & 0x2) 154 sclp_ipl_info.has_dump = 1; 155 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); 156 157 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; 158 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; 159 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; 160 161 sclp.hmfai = sccb->hmfai; 162 } 163 164 /* 165 * This function will be called after sclp_facilities_detect(), which gets 166 * called from early.c code. The sclp_facilities_detect() function retrieves 167 * and saves the IPL information. 168 */ 169 void __init sclp_get_ipl_info(struct sclp_ipl_info *info) 170 { 171 *info = sclp_ipl_info; 172 } 173 174 static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb) 175 { 176 int rc; 177 178 do { 179 rc = sclp_cmd_sync_early(cmd, sccb); 180 } while (rc == -EBUSY); 181 182 if (rc) 183 return -EIO; 184 if (((struct sccb_header *) sccb)->response_code != 0x0020) 185 return -EIO; 186 return 0; 187 } 188 189 static void __init sccb_init_eq_size(struct sdias_sccb *sccb) 190 { 191 memset(sccb, 0, sizeof(*sccb)); 192 193 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 } 201 202 static int __init sclp_set_event_mask(struct init_sccb *sccb, 203 unsigned long receive_mask, 204 unsigned long send_mask) 205 { 206 memset(sccb, 0, sizeof(*sccb)); 207 sccb->header.length = sizeof(*sccb); 208 sccb->mask_length = sizeof(sccb_mask_t); 209 sccb->receive_mask = receive_mask; 210 sccb->send_mask = send_mask; 211 return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb); 212 } 213 214 static long __init sclp_hsa_size_init(struct sdias_sccb *sccb) 215 { 216 sccb_init_eq_size(sccb); 217 if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb)) 218 return -EIO; 219 if (sccb->evbuf.blk_cnt == 0) 220 return 0; 221 return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; 222 } 223 224 static long __init sclp_hsa_copy_wait(struct sccb_header *sccb) 225 { 226 memset(sccb, 0, PAGE_SIZE); 227 sccb->length = PAGE_SIZE; 228 if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb)) 229 return -EIO; 230 if (((struct sdias_sccb *) sccb)->evbuf.blk_cnt == 0) 231 return 0; 232 return (((struct sdias_sccb *) sccb)->evbuf.blk_cnt - 1) * PAGE_SIZE; 233 } 234 235 static void __init sclp_hsa_size_detect(void *sccb) 236 { 237 long size; 238 239 /* First try synchronous interface (LPAR) */ 240 if (sclp_set_event_mask(sccb, 0, 0x40000010)) 241 return; 242 size = sclp_hsa_size_init(sccb); 243 if (size < 0) 244 return; 245 if (size != 0) 246 goto out; 247 /* Then try asynchronous interface (z/VM) */ 248 if (sclp_set_event_mask(sccb, 0x00000010, 0x40000010)) 249 return; 250 size = sclp_hsa_size_init(sccb); 251 if (size < 0) 252 return; 253 size = sclp_hsa_copy_wait(sccb); 254 if (size < 0) 255 return; 256 out: 257 sclp.hsa_size = size; 258 } 259 260 static unsigned int __init sclp_con_check_linemode(struct init_sccb *sccb) 261 { 262 if (!(sccb->sclp_send_mask & EVTYP_OPCMD_MASK)) 263 return 0; 264 if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK))) 265 return 0; 266 return 1; 267 } 268 269 static void __init sclp_console_detect(struct init_sccb *sccb) 270 { 271 if (sccb->header.response_code != 0x20) 272 return; 273 274 if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) 275 sclp.has_vt220 = 1; 276 277 if (sclp_con_check_linemode(sccb)) 278 sclp.has_linemode = 1; 279 } 280 281 void __init sclp_early_detect(void) 282 { 283 void *sccb = &sccb_early; 284 285 sclp_facilities_detect(sccb); 286 sclp_hsa_size_detect(sccb); 287 288 /* Turn off SCLP event notifications. Also save remote masks in the 289 * sccb. These are sufficient to detect sclp console capabilities. 290 */ 291 sclp_set_event_mask(sccb, 0, 0); 292 sclp_console_detect(sccb); 293 } 294