diff options
Diffstat (limited to 'drivers/s390/char/sclp_early.c')
| -rw-r--r-- | drivers/s390/char/sclp_early.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp_early.c b/drivers/s390/char/sclp_early.c new file mode 100644 index 000000000..faa3a4b8e --- /dev/null +++ b/drivers/s390/char/sclp_early.c @@ -0,0 +1,161 @@ +// 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 <asm/ctl_reg.h> +#include <asm/sclp.h> +#include <asm/ipl.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(struct read_info_sccb *sccb) +{ + struct sclp_core_entry *cpue; + u16 boot_cpu_address, cpu; + + if (sclp_early_get_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_gisaf = !!(sccb->fac118 & 0x08); + sclp.has_hvs = !!(sccb->fac119 & 0x80); + sclp.has_kss = !!(sccb->fac98 & 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); + if (sccb->cpuoff > 137) + sclp.has_sipl = !!(sccb->cbl & 0x4000); + 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; +} + +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 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 sclp_early_detect(void) +{ + void *sccb = sclp_early_sccb; + + sclp_early_facilities_detect(sccb); + sclp_early_init_core_info(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); +} |