1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * SCLP early driver 4 * 5 * Copyright IBM Corp. 2013 6 */ 7 8 #define KMSG_COMPONENT "sclp_early" 9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 10 11 #include <linux/errno.h> 12 #include <linux/memblock.h> 13 #include <asm/ctlreg.h> 14 #include <asm/sclp.h> 15 #include <asm/ipl.h> 16 #include <asm/setup.h> 17 #include <asm/facility.h> 18 #include "sclp_sdias.h" 19 #include "sclp.h" 20 21 static struct sclp_ipl_info sclp_ipl_info; 22 23 struct sclp_info sclp; 24 EXPORT_SYMBOL(sclp); 25 26 static void __init sclp_early_facilities_detect(void) 27 { 28 struct sclp_core_entry *cpue; 29 struct read_info_sccb *sccb; 30 u16 boot_cpu_address, cpu; 31 32 sccb = sclp_early_get_info(); 33 if (!sccb) 34 return; 35 36 sclp.facilities = sccb->facilities; 37 sclp.has_sprp = !!(sccb->fac84 & 0x02); 38 sclp.has_core_type = !!(sccb->fac84 & 0x01); 39 sclp.has_gsls = !!(sccb->fac85 & 0x80); 40 sclp.has_64bscao = !!(sccb->fac116 & 0x80); 41 sclp.has_cmma = !!(sccb->fac116 & 0x40); 42 sclp.has_esca = !!(sccb->fac116 & 0x08); 43 sclp.has_pfmfi = !!(sccb->fac117 & 0x40); 44 sclp.has_ibs = !!(sccb->fac117 & 0x20); 45 sclp.has_gisaf = !!(sccb->fac118 & 0x08); 46 sclp.has_hvs = !!(sccb->fac119 & 0x80); 47 sclp.has_kss = !!(sccb->fac98 & 0x01); 48 sclp.has_aisii = !!(sccb->fac118 & 0x40); 49 sclp.has_aeni = !!(sccb->fac118 & 0x20); 50 sclp.has_aisi = !!(sccb->fac118 & 0x10); 51 sclp.has_zpci_lsi = !!(sccb->fac118 & 0x01); 52 if (sccb->fac85 & 0x02) 53 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; 54 if (sccb->fac91 & 0x40) 55 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST; 56 if (sccb->cpuoff > 134) { 57 sclp.has_diag318 = !!(sccb->byte_134 & 0x80); 58 sclp.has_diag320 = !!(sccb->byte_134 & 0x04); 59 sclp.has_iplcc = !!(sccb->byte_134 & 0x02); 60 } 61 if (sccb->cpuoff > 137) { 62 sclp.has_sipl = !!(sccb->cbl & 0x4000); 63 sclp.has_sipl_eckd = !!(sccb->cbl & 0x2000); 64 } 65 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; 66 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; 67 sclp.rzm <<= 20; 68 sclp.ibc = sccb->ibc; 69 70 if (sccb->hamaxpow && sccb->hamaxpow < 64) 71 sclp.hamax = (1UL << sccb->hamaxpow) - 1; 72 else 73 sclp.hamax = U64_MAX; 74 75 if (!sccb->hcpua) { 76 if (MACHINE_IS_VM) 77 sclp.max_cores = 64; 78 else 79 sclp.max_cores = sccb->ncpurl; 80 } else { 81 sclp.max_cores = sccb->hcpua + 1; 82 } 83 84 boot_cpu_address = stap(); 85 cpue = (void *)sccb + sccb->cpuoff; 86 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { 87 if (boot_cpu_address != cpue->core_id) 88 continue; 89 sclp.has_siif = cpue->siif; 90 sclp.has_sigpif = cpue->sigpif; 91 sclp.has_sief2 = cpue->sief2; 92 sclp.has_gpere = cpue->gpere; 93 sclp.has_ib = cpue->ib; 94 sclp.has_cei = cpue->cei; 95 sclp.has_skey = cpue->skey; 96 break; 97 } 98 99 /* Save IPL information */ 100 sclp_ipl_info.is_valid = 1; 101 if (sccb->fac91 & 0x2) 102 sclp_ipl_info.has_dump = 1; 103 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); 104 105 if (sccb->hsa_size) 106 sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE; 107 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; 108 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; 109 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; 110 111 sclp.hmfai = sccb->hmfai; 112 sclp.has_dirq = !!(sccb->cpudirq & 0x80); 113 } 114 115 /* 116 * This function will be called after sclp_early_facilities_detect(), which gets 117 * called from early.c code. The sclp_early_facilities_detect() function retrieves 118 * and saves the IPL information. 119 */ 120 void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info) 121 { 122 *info = sclp_ipl_info; 123 } 124 125 int __init sclp_early_get_core_info(struct sclp_core_info *info) 126 { 127 struct read_cpu_info_sccb *sccb; 128 int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE; 129 int rc = 0; 130 131 if (!SCLP_HAS_CPU_INFO) 132 return -EOPNOTSUPP; 133 134 sccb = memblock_alloc_low(length, PAGE_SIZE); 135 if (!sccb) 136 return -ENOMEM; 137 138 memset(sccb, 0, length); 139 sccb->header.length = length; 140 sccb->header.control_mask[2] = 0x80; 141 if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) { 142 rc = -EIO; 143 goto out; 144 } 145 if (sccb->header.response_code != 0x0010) { 146 rc = -EIO; 147 goto out; 148 } 149 sclp_fill_core_info(info, sccb); 150 out: 151 memblock_free(sccb, length); 152 return rc; 153 } 154 155 static void __init sclp_early_console_detect(struct init_sccb *sccb) 156 { 157 if (sccb->header.response_code != 0x20) 158 return; 159 160 if (sclp_early_con_check_vt220(sccb)) 161 sclp.has_vt220 = 1; 162 163 if (sclp_early_con_check_linemode(sccb)) 164 sclp.has_linemode = 1; 165 } 166 167 void __init __no_sanitize_address sclp_early_adjust_va(void) 168 { 169 sclp_early_sccb = __va((unsigned long)sclp_early_sccb); 170 } 171 172 void __init sclp_early_detect(void) 173 { 174 void *sccb = sclp_early_sccb; 175 176 sclp_early_facilities_detect(); 177 178 /* 179 * Turn off SCLP event notifications. Also save remote masks in the 180 * sccb. These are sufficient to detect sclp console capabilities. 181 */ 182 sclp_early_set_event_mask(sccb, 0, 0); 183 sclp_early_console_detect(sccb); 184 } 185