// SPDX-License-Identifier: GPL-2.0 /* * SCLP early driver * * Copyright IBM Corp. 2013 */ #define KMSG_COMPONENT "sclp_early" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt #include <linux/errno.h> #include <linux/memblock.h> #include <asm/ctlreg.h> #include <asm/sclp.h> #include <asm/ipl.h> #include <asm/setup.h> #include <asm/facility.h> #include "sclp_sdias.h" #include "sclp.h" static struct sclp_ipl_info sclp_ipl_info; struct sclp_info sclp; EXPORT_SYMBOL(sclp); static void __init sclp_early_facilities_detect(void) { struct sclp_core_entry *cpue; struct read_info_sccb *sccb; u16 boot_cpu_address, cpu; sccb = sclp_early_get_info(); if (!sccb) return; sclp.facilities = sccb->facilities; sclp.has_sprp = !!(sccb->fac84 & 0x02); sclp.has_core_type = !!(sccb->fac84 & 0x01); sclp.has_gsls = !!(sccb->fac85 & 0x80); sclp.has_64bscao = !!(sccb->fac116 & 0x80); sclp.has_cmma = !!(sccb->fac116 & 0x40); sclp.has_esca = !!(sccb->fac116 & 0x08); sclp.has_pfmfi = !!(sccb->fac117 & 0x40); sclp.has_ibs = !!(sccb->fac117 & 0x20); sclp.has_gisaf = !!(sccb->fac118 & 0x08); sclp.has_hvs = !!(sccb->fac119 & 0x80); sclp.has_kss = !!(sccb->fac98 & 0x01); sclp.has_aisii = !!(sccb->fac118 & 0x40); sclp.has_aeni = !!(sccb->fac118 & 0x20); sclp.has_aisi = !!(sccb->fac118 & 0x10); sclp.has_zpci_lsi = !!(sccb->fac118 & 0x01); if (sccb->fac85 & 0x02) S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; if (sccb->fac91 & 0x40) S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST; if (sccb->cpuoff > 134) { sclp.has_diag318 = !!(sccb->byte_134 & 0x80); sclp.has_diag320 = !!(sccb->byte_134 & 0x04); sclp.has_iplcc = !!(sccb->byte_134 & 0x02); } if (sccb->cpuoff > 137) { sclp.has_sipl = !!(sccb->cbl & 0x4000); sclp.has_sipl_eckd = !!(sccb->cbl & 0x2000); } sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; sclp.rzm <<= 20; sclp.ibc = sccb->ibc; if (sccb->hamaxpow && sccb->hamaxpow < 64) sclp.hamax = (1UL << sccb->hamaxpow) - 1; else sclp.hamax = U64_MAX; if (!sccb->hcpua) { if (MACHINE_IS_VM) sclp.max_cores = 64; else sclp.max_cores = sccb->ncpurl; } else { sclp.max_cores = sccb->hcpua + 1; } boot_cpu_address = stap(); cpue = (void *)sccb + sccb->cpuoff; for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { if (boot_cpu_address != cpue->core_id) continue; sclp.has_siif = cpue->siif; sclp.has_sigpif = cpue->sigpif; sclp.has_sief2 = cpue->sief2; sclp.has_gpere = cpue->gpere; sclp.has_ib = cpue->ib; sclp.has_cei = cpue->cei; sclp.has_skey = cpue->skey; break; } /* Save IPL information */ sclp_ipl_info.is_valid = 1; if (sccb->fac91 & 0x2) sclp_ipl_info.has_dump = 1; memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); if (sccb->hsa_size) sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE; sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; sclp.hmfai = sccb->hmfai; sclp.has_dirq = !!(sccb->cpudirq & 0x80); } /* * This function will be called after sclp_early_facilities_detect(), which gets * called from early.c code. The sclp_early_facilities_detect() function retrieves * and saves the IPL information. */ void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info) { *info = sclp_ipl_info; } int __init sclp_early_get_core_info(struct sclp_core_info *info) { struct read_cpu_info_sccb *sccb; int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE; int rc = 0; if (!SCLP_HAS_CPU_INFO) return -EOPNOTSUPP; sccb = memblock_alloc_low(length, PAGE_SIZE); if (!sccb) return -ENOMEM; memset(sccb, 0, length); sccb->header.length = length; sccb->header.control_mask[2] = 0x80; if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) { rc = -EIO; goto out; } if (sccb->header.response_code != 0x0010) { rc = -EIO; goto out; } sclp_fill_core_info(info, sccb); out: memblock_free(sccb, length); return rc; } static void __init sclp_early_console_detect(struct init_sccb *sccb) { if (sccb->header.response_code != 0x20) return; if (sclp_early_con_check_vt220(sccb)) sclp.has_vt220 = 1; if (sclp_early_con_check_linemode(sccb)) sclp.has_linemode = 1; } void __init __no_sanitize_address sclp_early_adjust_va(void) { sclp_early_sccb = __va((unsigned long)sclp_early_sccb); } void __init sclp_early_detect(void) { void *sccb = sclp_early_sccb; sclp_early_facilities_detect(); /* * Turn off SCLP event notifications. Also save remote masks in the * sccb. These are sufficient to detect sclp console capabilities. */ sclp_early_set_event_mask(sccb, 0, 0); sclp_early_console_detect(sccb); }