187 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * SCLP early driver4 *5 * Copyright IBM Corp. 20136 */7 8#define KMSG_COMPONENT "sclp_early"9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt10 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 21static struct sclp_ipl_info sclp_ipl_info;22 23struct sclp_info sclp;24EXPORT_SYMBOL(sclp);25 26static 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 else75 sclp.hamax = U64_MAX;76 77 if (!sccb->hcpua) {78 if (MACHINE_IS_VM)79 sclp.max_cores = 64;80 else81 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 gets119 * called from early.c code. The sclp_early_facilities_detect() function retrieves120 * and saves the IPL information.121 */122void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)123{124 *info = sclp_ipl_info;125}126 127int __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);152out:153 memblock_free(sccb, length);154 return rc;155}156 157static 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 169void __init __no_sanitize_address sclp_early_adjust_va(void)170{171 sclp_early_sccb = __va((unsigned long)sclp_early_sccb);172}173 174void __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 the182 * 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