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_wti = !!(sccb->fac119 & 0x40); 48 sclp.has_kss = !!(sccb->fac98 & 0x01); 49 sclp.has_aisii = !!(sccb->fac118 & 0x40); 50 sclp.has_aeni = !!(sccb->fac118 & 0x20); 51 sclp.has_aisi = !!(sccb->fac118 & 0x10); 52 sclp.has_zpci_lsi = !!(sccb->fac118 & 0x01); 53 if (sccb->fac85 & 0x02) 54 get_lowcore()->machine_flags |= MACHINE_FLAG_ESOP; 55 if (sccb->fac91 & 0x40) 56 get_lowcore()->machine_flags |= MACHINE_FLAG_TLB_GUEST; 57 sclp.has_diag204_bif = !!(sccb->fac98 & 0x80); 58 if (sccb->cpuoff > 134) { 59 sclp.has_diag318 = !!(sccb->byte_134 & 0x80); 60 sclp.has_diag320 = !!(sccb->byte_134 & 0x04); 61 sclp.has_iplcc = !!(sccb->byte_134 & 0x02); 62 } 63 if (sccb->cpuoff > 137) { 64 sclp.has_sipl = !!(sccb->cbl & 0x4000); 65 sclp.has_sipl_eckd = !!(sccb->cbl & 0x2000); 66 } 67 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; 68 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; 69 sclp.rzm <<= 20; 70 sclp.ibc = sccb->ibc; 71 72 if (sccb->hamaxpow && sccb->hamaxpow < 64) 73 sclp.hamax = (1UL << sccb->hamaxpow) - 1; 74 else 75 sclp.hamax = U64_MAX; 76 77 if (!sccb->hcpua) { 78 if (MACHINE_IS_VM) 79 sclp.max_cores = 64; 80 else 81 sclp.max_cores = sccb->ncpurl; 82 } else { 83 sclp.max_cores = sccb->hcpua + 1; 84 } 85 86 boot_cpu_address = stap(); 87 cpue = (void *)sccb + sccb->cpuoff; 88 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { 89 if (boot_cpu_address != cpue->core_id) 90 continue; 91 sclp.has_siif = cpue->siif; 92 sclp.has_sigpif = cpue->sigpif; 93 sclp.has_sief2 = cpue->sief2; 94 sclp.has_gpere = cpue->gpere; 95 sclp.has_ib = cpue->ib; 96 sclp.has_cei = cpue->cei; 97 sclp.has_skey = cpue->skey; 98 break; 99 } 100 101 /* Save IPL information */ 102 sclp_ipl_info.is_valid = 1; 103 if (sccb->fac91 & 0x2) 104 sclp_ipl_info.has_dump = 1; 105 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); 106 107 if (sccb->hsa_size) 108 sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE; 109 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; 110 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; 111 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; 112 113 sclp.hmfai = sccb->hmfai; 114 sclp.has_dirq = !!(sccb->cpudirq & 0x80); 115 } 116 117 /* 118 * This function will be called after sclp_early_facilities_detect(), which gets 119 * called from early.c code. The sclp_early_facilities_detect() function retrieves 120 * and saves the IPL information. 121 */ 122 void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info) 123 { 124 *info = sclp_ipl_info; 125 } 126 127 int __init sclp_early_get_core_info(struct sclp_core_info *info) 128 { 129 struct read_cpu_info_sccb *sccb; 130 int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE; 131 int rc = 0; 132 133 if (!SCLP_HAS_CPU_INFO) 134 return -EOPNOTSUPP; 135 136 sccb = memblock_alloc_low(length, PAGE_SIZE); 137 if (!sccb) 138 return -ENOMEM; 139 140 memset(sccb, 0, length); 141 sccb->header.length = length; 142 sccb->header.control_mask[2] = 0x80; 143 if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) { 144 rc = -EIO; 145 goto out; 146 } 147 if (sccb->header.response_code != 0x0010) { 148 rc = -EIO; 149 goto out; 150 } 151 sclp_fill_core_info(info, sccb); 152 out: 153 memblock_free(sccb, length); 154 return rc; 155 } 156 157 static void __init sclp_early_console_detect(struct init_sccb *sccb) 158 { 159 if (sccb->header.response_code != 0x20) 160 return; 161 162 if (sclp_early_con_check_vt220(sccb)) 163 sclp.has_vt220 = 1; 164 165 if (sclp_early_con_check_linemode(sccb)) 166 sclp.has_linemode = 1; 167 } 168 169 void __init __no_sanitize_address sclp_early_adjust_va(void) 170 { 171 sclp_early_sccb = __va((unsigned long)sclp_early_sccb); 172 } 173 174 void __init sclp_early_detect(void) 175 { 176 void *sccb = sclp_early_sccb; 177 178 sclp_early_facilities_detect(); 179 180 /* 181 * Turn off SCLP event notifications. Also save remote masks in the 182 * sccb. These are sufficient to detect sclp console capabilities. 183 */ 184 sclp_early_set_event_mask(sccb, 0, 0); 185 sclp_early_console_detect(sccb); 186 } 187