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 if (sccb->fac85 & 0x02) 49 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; 50 if (sccb->fac91 & 0x40) 51 S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST; 52 if (sccb->cpuoff > 134) 53 sclp.has_diag318 = !!(sccb->byte_134 & 0x80); 54 if (sccb->cpuoff > 137) 55 sclp.has_sipl = !!(sccb->cbl & 0x4000); 56 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; 57 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; 58 sclp.rzm <<= 20; 59 sclp.ibc = sccb->ibc; 60 61 if (sccb->hamaxpow && sccb->hamaxpow < 64) 62 sclp.hamax = (1UL << sccb->hamaxpow) - 1; 63 else 64 sclp.hamax = U64_MAX; 65 66 if (!sccb->hcpua) { 67 if (MACHINE_IS_VM) 68 sclp.max_cores = 64; 69 else 70 sclp.max_cores = sccb->ncpurl; 71 } else { 72 sclp.max_cores = sccb->hcpua + 1; 73 } 74 75 boot_cpu_address = stap(); 76 cpue = (void *)sccb + sccb->cpuoff; 77 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { 78 if (boot_cpu_address != cpue->core_id) 79 continue; 80 sclp.has_siif = cpue->siif; 81 sclp.has_sigpif = cpue->sigpif; 82 sclp.has_sief2 = cpue->sief2; 83 sclp.has_gpere = cpue->gpere; 84 sclp.has_ib = cpue->ib; 85 sclp.has_cei = cpue->cei; 86 sclp.has_skey = cpue->skey; 87 break; 88 } 89 90 /* Save IPL information */ 91 sclp_ipl_info.is_valid = 1; 92 if (sccb->fac91 & 0x2) 93 sclp_ipl_info.has_dump = 1; 94 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); 95 96 if (sccb->hsa_size) 97 sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE; 98 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; 99 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; 100 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; 101 102 sclp.hmfai = sccb->hmfai; 103 sclp.has_dirq = !!(sccb->cpudirq & 0x80); 104 } 105 106 /* 107 * This function will be called after sclp_early_facilities_detect(), which gets 108 * called from early.c code. The sclp_early_facilities_detect() function retrieves 109 * and saves the IPL information. 110 */ 111 void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info) 112 { 113 *info = sclp_ipl_info; 114 } 115 116 int __init sclp_early_get_core_info(struct sclp_core_info *info) 117 { 118 struct read_cpu_info_sccb *sccb; 119 int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE; 120 int rc = 0; 121 122 if (!SCLP_HAS_CPU_INFO) 123 return -EOPNOTSUPP; 124 125 sccb = memblock_alloc_low(length, PAGE_SIZE); 126 if (!sccb) 127 return -ENOMEM; 128 129 memset(sccb, 0, length); 130 sccb->header.length = length; 131 sccb->header.control_mask[2] = 0x80; 132 if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) { 133 rc = -EIO; 134 goto out; 135 } 136 if (sccb->header.response_code != 0x0010) { 137 rc = -EIO; 138 goto out; 139 } 140 sclp_fill_core_info(info, sccb); 141 out: 142 memblock_free((unsigned long)sccb, length); 143 return rc; 144 } 145 146 static void __init sclp_early_console_detect(struct init_sccb *sccb) 147 { 148 if (sccb->header.response_code != 0x20) 149 return; 150 151 if (sclp_early_con_check_vt220(sccb)) 152 sclp.has_vt220 = 1; 153 154 if (sclp_early_con_check_linemode(sccb)) 155 sclp.has_linemode = 1; 156 } 157 158 void __init sclp_early_detect(void) 159 { 160 void *sccb = sclp_early_sccb; 161 162 sclp_early_facilities_detect(); 163 164 /* 165 * Turn off SCLP event notifications. Also save remote masks in the 166 * sccb. These are sufficient to detect sclp console capabilities. 167 */ 168 sclp_early_set_event_mask(sccb, 0, 0); 169 sclp_early_console_detect(sccb); 170 } 171