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[100 - 92]; /* 92-99 */ 44 u32 rnsize2; /* 100-103 */ 45 u64 rnmax2; /* 104-111 */ 46 u8 _pad_112[120 - 112]; /* 112-119 */ 47 u16 hcpua; /* 120-121 */ 48 u8 _pad_122[4096 - 122]; /* 122-4095 */ 49 } __packed __aligned(PAGE_SIZE); 50 51 static char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE) __initdata; 52 static struct sclp_ipl_info sclp_ipl_info; 53 54 struct sclp_info sclp; 55 EXPORT_SYMBOL(sclp); 56 57 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb) 58 { 59 int rc; 60 61 __ctl_set_bit(0, 9); 62 rc = sclp_service_call(cmd, sccb); 63 if (rc) 64 goto out; 65 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | 66 PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT); 67 local_irq_disable(); 68 out: 69 /* Contents of the sccb might have changed. */ 70 barrier(); 71 __ctl_clear_bit(0, 9); 72 return rc; 73 } 74 75 static int __init sclp_read_info_early(struct read_info_sccb *sccb) 76 { 77 int rc, i; 78 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, 79 SCLP_CMDW_READ_SCP_INFO}; 80 81 for (i = 0; i < ARRAY_SIZE(commands); i++) { 82 do { 83 memset(sccb, 0, sizeof(*sccb)); 84 sccb->header.length = sizeof(*sccb); 85 sccb->header.function_code = 0x80; 86 sccb->header.control_mask[2] = 0x80; 87 rc = sclp_cmd_sync_early(commands[i], sccb); 88 } while (rc == -EBUSY); 89 90 if (rc) 91 break; 92 if (sccb->header.response_code == 0x10) 93 return 0; 94 if (sccb->header.response_code != 0x1f0) 95 break; 96 } 97 return -EIO; 98 } 99 100 static void __init sclp_facilities_detect(struct read_info_sccb *sccb) 101 { 102 struct sclp_core_entry *cpue; 103 u16 boot_cpu_address, cpu; 104 105 if (sclp_read_info_early(sccb)) 106 return; 107 108 sclp.facilities = sccb->facilities; 109 sclp.has_sprp = !!(sccb->fac84 & 0x02); 110 sclp.has_core_type = !!(sccb->fac84 & 0x01); 111 if (sccb->fac85 & 0x02) 112 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; 113 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; 114 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; 115 sclp.rzm <<= 20; 116 sclp.ibc = sccb->ibc; 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 break; 135 } 136 137 /* Save IPL information */ 138 sclp_ipl_info.is_valid = 1; 139 if (sccb->flags & 0x2) 140 sclp_ipl_info.has_dump = 1; 141 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); 142 143 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; 144 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; 145 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; 146 } 147 148 /* 149 * This function will be called after sclp_facilities_detect(), which gets 150 * called from early.c code. The sclp_facilities_detect() function retrieves 151 * and saves the IPL information. 152 */ 153 void __init sclp_get_ipl_info(struct sclp_ipl_info *info) 154 { 155 *info = sclp_ipl_info; 156 } 157 158 static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb) 159 { 160 int rc; 161 162 do { 163 rc = sclp_cmd_sync_early(cmd, sccb); 164 } while (rc == -EBUSY); 165 166 if (rc) 167 return -EIO; 168 if (((struct sccb_header *) sccb)->response_code != 0x0020) 169 return -EIO; 170 return 0; 171 } 172 173 static void __init sccb_init_eq_size(struct sdias_sccb *sccb) 174 { 175 memset(sccb, 0, sizeof(*sccb)); 176 177 sccb->hdr.length = sizeof(*sccb); 178 sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf); 179 sccb->evbuf.hdr.type = EVTYP_SDIAS; 180 sccb->evbuf.event_qual = SDIAS_EQ_SIZE; 181 sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP; 182 sccb->evbuf.event_id = 4712; 183 sccb->evbuf.dbs = 1; 184 } 185 186 static int __init sclp_set_event_mask(struct init_sccb *sccb, 187 unsigned long receive_mask, 188 unsigned long send_mask) 189 { 190 memset(sccb, 0, sizeof(*sccb)); 191 sccb->header.length = sizeof(*sccb); 192 sccb->mask_length = sizeof(sccb_mask_t); 193 sccb->receive_mask = receive_mask; 194 sccb->send_mask = send_mask; 195 return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb); 196 } 197 198 static long __init sclp_hsa_size_init(struct sdias_sccb *sccb) 199 { 200 sccb_init_eq_size(sccb); 201 if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb)) 202 return -EIO; 203 if (sccb->evbuf.blk_cnt == 0) 204 return 0; 205 return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; 206 } 207 208 static long __init sclp_hsa_copy_wait(struct sccb_header *sccb) 209 { 210 memset(sccb, 0, PAGE_SIZE); 211 sccb->length = PAGE_SIZE; 212 if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb)) 213 return -EIO; 214 if (((struct sdias_sccb *) sccb)->evbuf.blk_cnt == 0) 215 return 0; 216 return (((struct sdias_sccb *) sccb)->evbuf.blk_cnt - 1) * PAGE_SIZE; 217 } 218 219 static void __init sclp_hsa_size_detect(void *sccb) 220 { 221 long size; 222 223 /* First try synchronous interface (LPAR) */ 224 if (sclp_set_event_mask(sccb, 0, 0x40000010)) 225 return; 226 size = sclp_hsa_size_init(sccb); 227 if (size < 0) 228 return; 229 if (size != 0) 230 goto out; 231 /* Then try asynchronous interface (z/VM) */ 232 if (sclp_set_event_mask(sccb, 0x00000010, 0x40000010)) 233 return; 234 size = sclp_hsa_size_init(sccb); 235 if (size < 0) 236 return; 237 size = sclp_hsa_copy_wait(sccb); 238 if (size < 0) 239 return; 240 out: 241 sclp.hsa_size = size; 242 } 243 244 static unsigned int __init sclp_con_check_linemode(struct init_sccb *sccb) 245 { 246 if (!(sccb->sclp_send_mask & EVTYP_OPCMD_MASK)) 247 return 0; 248 if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK))) 249 return 0; 250 return 1; 251 } 252 253 static void __init sclp_console_detect(struct init_sccb *sccb) 254 { 255 if (sccb->header.response_code != 0x20) 256 return; 257 258 if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) 259 sclp.has_vt220 = 1; 260 261 if (sclp_con_check_linemode(sccb)) 262 sclp.has_linemode = 1; 263 } 264 265 void __init sclp_early_detect(void) 266 { 267 void *sccb = &sccb_early; 268 269 sclp_facilities_detect(sccb); 270 sclp_hsa_size_detect(sccb); 271 272 /* Turn off SCLP event notifications. Also save remote masks in the 273 * sccb. These are sufficient to detect sclp console capabilities. 274 */ 275 sclp_set_event_mask(sccb, 0, 0); 276 sclp_console_detect(sccb); 277 } 278