/* * SCLP early driver * * Copyright IBM Corp. 2013 */ #define KMSG_COMPONENT "sclp_early" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt #include <linux/errno.h> #include <asm/ctl_reg.h> #include <asm/sclp.h> #include <asm/ipl.h> #include "sclp_sdias.h" #include "sclp.h" #define SCLP_CMDW_READ_SCP_INFO 0x00020001 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001 struct read_info_sccb { struct sccb_header header; /* 0-7 */ u16 rnmax; /* 8-9 */ u8 rnsize; /* 10 */ u8 _pad_11[16 - 11]; /* 11-15 */ u16 ncpurl; /* 16-17 */ u16 cpuoff; /* 18-19 */ u8 _pad_20[24 - 20]; /* 20-23 */ u8 loadparm[8]; /* 24-31 */ u8 _pad_32[42 - 32]; /* 32-41 */ u8 fac42; /* 42 */ u8 fac43; /* 43 */ u8 _pad_44[48 - 44]; /* 44-47 */ u64 facilities; /* 48-55 */ u8 _pad_56[66 - 56]; /* 56-65 */ u8 fac66; /* 66 */ u8 _pad_67[76 - 67]; /* 67-83 */ u32 ibc; /* 76-79 */ u8 _pad80[84 - 80]; /* 80-83 */ u8 fac84; /* 84 */ u8 fac85; /* 85 */ u8 _pad_86[91 - 86]; /* 86-90 */ u8 flags; /* 91 */ u8 _pad_92[99 - 92]; /* 92-98 */ u8 hamaxpow; /* 99 */ u32 rnsize2; /* 100-103 */ u64 rnmax2; /* 104-111 */ u8 _pad_112[116 - 112]; /* 112-115 */ u8 fac116; /* 116 */ u8 fac117; /* 117 */ u8 _pad_118; /* 118 */ u8 fac119; /* 119 */ u16 hcpua; /* 120-121 */ u8 _pad_122[124 - 122]; /* 122-123 */ u32 hmfai; /* 124-127 */ u8 _pad_128[4096 - 128]; /* 128-4095 */ } __packed __aligned(PAGE_SIZE); static struct sclp_ipl_info sclp_ipl_info; struct sclp_info sclp; EXPORT_SYMBOL(sclp); static int __init sclp_early_read_info(struct read_info_sccb *sccb) { int i; sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, SCLP_CMDW_READ_SCP_INFO}; for (i = 0; i < ARRAY_SIZE(commands); i++) { memset(sccb, 0, sizeof(*sccb)); sccb->header.length = sizeof(*sccb); sccb->header.function_code = 0x80; sccb->header.control_mask[2] = 0x80; if (sclp_early_cmd(commands[i], sccb)) break; if (sccb->header.response_code == 0x10) return 0; if (sccb->header.response_code != 0x1f0) break; } return -EIO; } static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb) { struct sclp_core_entry *cpue; u16 boot_cpu_address, cpu; if (sclp_early_read_info(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_hvs = !!(sccb->fac119 & 0x80); if (sccb->fac85 & 0x02) S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; 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->flags & 0x2) sclp_ipl_info.has_dump = 1; memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); 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; } /* * 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; } static struct sclp_core_info sclp_early_core_info __initdata; static int sclp_early_core_info_valid __initdata; static void __init sclp_early_init_core_info(struct read_cpu_info_sccb *sccb) { if (!SCLP_HAS_CPU_INFO) return; memset(sccb, 0, sizeof(*sccb)); sccb->header.length = sizeof(*sccb); if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) return; if (sccb->header.response_code != 0x0010) return; sclp_fill_core_info(&sclp_early_core_info, sccb); sclp_early_core_info_valid = 1; } int __init sclp_early_get_core_info(struct sclp_core_info *info) { if (!sclp_early_core_info_valid) return -EIO; *info = sclp_early_core_info; return 0; } static long __init sclp_early_hsa_size_init(struct sdias_sccb *sccb) { memset(sccb, 0, sizeof(*sccb)); sccb->hdr.length = sizeof(*sccb); sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf); sccb->evbuf.hdr.type = EVTYP_SDIAS; sccb->evbuf.event_qual = SDIAS_EQ_SIZE; sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP; sccb->evbuf.event_id = 4712; sccb->evbuf.dbs = 1; if (sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_DATA, sccb)) return -EIO; if (sccb->hdr.response_code != 0x20) return -EIO; if (sccb->evbuf.blk_cnt == 0) return 0; return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; } static long __init sclp_early_hsa_copy_wait(struct sdias_sccb *sccb) { memset(sccb, 0, PAGE_SIZE); sccb->hdr.length = PAGE_SIZE; if (sclp_early_cmd(SCLP_CMDW_READ_EVENT_DATA, sccb)) return -EIO; if ((sccb->hdr.response_code != 0x20) && (sccb->hdr.response_code != 0x220)) return -EIO; if (sccb->evbuf.blk_cnt == 0) return 0; return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; } static void __init sclp_early_hsa_size_detect(void *sccb) { unsigned long flags; long size = -EIO; raw_local_irq_save(flags); if (sclp_early_set_event_mask(sccb, EVTYP_SDIAS_MASK, EVTYP_SDIAS_MASK)) goto out; size = sclp_early_hsa_size_init(sccb); /* First check for synchronous response (LPAR) */ if (size) goto out_mask; if (!(S390_lowcore.ext_params & 1)) sclp_early_wait_irq(); size = sclp_early_hsa_copy_wait(sccb); out_mask: sclp_early_set_event_mask(sccb, 0, 0); out: raw_local_irq_restore(flags); if (size > 0) sclp.hsa_size = size; } static void __init sclp_early_console_detect(struct init_sccb *sccb) { if (sccb->header.response_code != 0x20) return; if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) sclp.has_vt220 = 1; if (sclp_early_con_check_linemode(sccb)) sclp.has_linemode = 1; } void __init sclp_early_detect(void) { void *sccb = &sclp_early_sccb; sclp_early_facilities_detect(sccb); sclp_early_init_core_info(sccb); sclp_early_hsa_size_detect(sccb); /* * 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); }