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/ctl_reg.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_iplcc = !!(sccb->byte_134 & 0x02); 59 } 60 if (sccb->cpuoff > 137) { 61 sclp.has_sipl = !!(sccb->cbl & 0x4000); 62 sclp.has_sipl_eckd = !!(sccb->cbl & 0x2000); 63 } 64 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; 65 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; 66 sclp.rzm <<= 20; 67 sclp.ibc = sccb->ibc; 68 69 if (sccb->hamaxpow && sccb->hamaxpow < 64) 70 sclp.hamax = (1UL << sccb->hamaxpow) - 1; 71 else 72 sclp.hamax = U64_MAX; 73 74 if (!sccb->hcpua) { 75 if (MACHINE_IS_VM) 76 sclp.max_cores = 64; 77 else 78 sclp.max_cores = sccb->ncpurl; 79 } else { 80 sclp.max_cores = sccb->hcpua + 1; 81 } 82 83 boot_cpu_address = stap(); 84 cpue = (void *)sccb + sccb->cpuoff; 85 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { 86 if (boot_cpu_address != cpue->core_id) 87 continue; 88 sclp.has_siif = cpue->siif; 89 sclp.has_sigpif = cpue->sigpif; 90 sclp.has_sief2 = cpue->sief2; 91 sclp.has_gpere = cpue->gpere; 92 sclp.has_ib = cpue->ib; 93 sclp.has_cei = cpue->cei; 94 sclp.has_skey = cpue->skey; 95 break; 96 } 97 98 /* Save IPL information */ 99 sclp_ipl_info.is_valid = 1; 100 if (sccb->fac91 & 0x2) 101 sclp_ipl_info.has_dump = 1; 102 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); 103 104 if (sccb->hsa_size) 105 sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE; 106 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; 107 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; 108 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; 109 110 sclp.hmfai = sccb->hmfai; 111 sclp.has_dirq = !!(sccb->cpudirq & 0x80); 112 } 113 114 /* 115 * This function will be called after sclp_early_facilities_detect(), which gets 116 * called from early.c code. The sclp_early_facilities_detect() function retrieves 117 * and saves the IPL information. 118 */ 119 void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info) 120 { 121 *info = sclp_ipl_info; 122 } 123 124 int __init sclp_early_get_core_info(struct sclp_core_info *info) 125 { 126 struct read_cpu_info_sccb *sccb; 127 int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE; 128 int rc = 0; 129 130 if (!SCLP_HAS_CPU_INFO) 131 return -EOPNOTSUPP; 132 133 sccb = memblock_alloc_low(length, PAGE_SIZE); 134 if (!sccb) 135 return -ENOMEM; 136 137 memset(sccb, 0, length); 138 sccb->header.length = length; 139 sccb->header.control_mask[2] = 0x80; 140 if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) { 141 rc = -EIO; 142 goto out; 143 } 144 if (sccb->header.response_code != 0x0010) { 145 rc = -EIO; 146 goto out; 147 } 148 sclp_fill_core_info(info, sccb); 149 out: 150 memblock_free(sccb, length); 151 return rc; 152 } 153 154 static void __init sclp_early_console_detect(struct init_sccb *sccb) 155 { 156 if (sccb->header.response_code != 0x20) 157 return; 158 159 if (sclp_early_con_check_vt220(sccb)) 160 sclp.has_vt220 = 1; 161 162 if (sclp_early_con_check_linemode(sccb)) 163 sclp.has_linemode = 1; 164 } 165 166 void __init sclp_early_adjust_va(void) 167 { 168 sclp_early_sccb = __va((unsigned long)sclp_early_sccb); 169 } 170 171 void __init sclp_early_detect(void) 172 { 173 void *sccb = sclp_early_sccb; 174 175 sclp_early_facilities_detect(); 176 177 /* 178 * Turn off SCLP event notifications. Also save remote masks in the 179 * sccb. These are sufficient to detect sclp console capabilities. 180 */ 181 sclp_early_set_event_mask(sccb, 0, 0); 182 sclp_early_console_detect(sccb); 183 } 184