diff options
Diffstat (limited to 'drivers/s390/char/sclp_early.c')
| -rw-r--r-- | drivers/s390/char/sclp_early.c | 273 |
1 files changed, 273 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..9a74abb92 --- /dev/null +++ b/drivers/s390/char/sclp_early.c @@ -0,0 +1,273 @@ +// 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" + +#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 fac91; /* 91 */ + u8 _pad_92[98 - 92]; /* 92-97 */ + u8 fac98; /* 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 fac118; /* 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_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; + 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); + + 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 (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); + 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); +} |