274 lines
7.2 KiB
C
274 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* SCLP early driver
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*
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* Copyright IBM Corp. 2013
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*/
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#define KMSG_COMPONENT "sclp_early"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/errno.h>
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#include <asm/ctl_reg.h>
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#include <asm/sclp.h>
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#include <asm/ipl.h>
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#include "sclp_sdias.h"
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#include "sclp.h"
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#define SCLP_CMDW_READ_SCP_INFO 0x00020001
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#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
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struct read_info_sccb {
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struct sccb_header header; /* 0-7 */
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u16 rnmax; /* 8-9 */
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u8 rnsize; /* 10 */
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u8 _pad_11[16 - 11]; /* 11-15 */
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u16 ncpurl; /* 16-17 */
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u16 cpuoff; /* 18-19 */
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u8 _pad_20[24 - 20]; /* 20-23 */
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u8 loadparm[8]; /* 24-31 */
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u8 _pad_32[42 - 32]; /* 32-41 */
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u8 fac42; /* 42 */
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u8 fac43; /* 43 */
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u8 _pad_44[48 - 44]; /* 44-47 */
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u64 facilities; /* 48-55 */
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u8 _pad_56[66 - 56]; /* 56-65 */
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u8 fac66; /* 66 */
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u8 _pad_67[76 - 67]; /* 67-83 */
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u32 ibc; /* 76-79 */
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u8 _pad80[84 - 80]; /* 80-83 */
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u8 fac84; /* 84 */
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u8 fac85; /* 85 */
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u8 _pad_86[91 - 86]; /* 86-90 */
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u8 fac91; /* 91 */
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u8 _pad_92[98 - 92]; /* 92-97 */
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u8 fac98; /* 98 */
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u8 hamaxpow; /* 99 */
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u32 rnsize2; /* 100-103 */
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u64 rnmax2; /* 104-111 */
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u8 _pad_112[116 - 112]; /* 112-115 */
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u8 fac116; /* 116 */
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u8 fac117; /* 117 */
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u8 fac118; /* 118 */
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u8 fac119; /* 119 */
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u16 hcpua; /* 120-121 */
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u8 _pad_122[124 - 122]; /* 122-123 */
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u32 hmfai; /* 124-127 */
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u8 _pad_128[4096 - 128]; /* 128-4095 */
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} __packed __aligned(PAGE_SIZE);
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static struct sclp_ipl_info sclp_ipl_info;
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struct sclp_info sclp;
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EXPORT_SYMBOL(sclp);
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static int __init sclp_early_read_info(struct read_info_sccb *sccb)
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{
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int i;
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sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
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SCLP_CMDW_READ_SCP_INFO};
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for (i = 0; i < ARRAY_SIZE(commands); i++) {
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memset(sccb, 0, sizeof(*sccb));
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sccb->header.length = sizeof(*sccb);
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sccb->header.function_code = 0x80;
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sccb->header.control_mask[2] = 0x80;
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if (sclp_early_cmd(commands[i], sccb))
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break;
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if (sccb->header.response_code == 0x10)
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return 0;
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if (sccb->header.response_code != 0x1f0)
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break;
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}
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return -EIO;
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}
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static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb)
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{
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struct sclp_core_entry *cpue;
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u16 boot_cpu_address, cpu;
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if (sclp_early_read_info(sccb))
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return;
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sclp.facilities = sccb->facilities;
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sclp.has_sprp = !!(sccb->fac84 & 0x02);
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sclp.has_core_type = !!(sccb->fac84 & 0x01);
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sclp.has_gsls = !!(sccb->fac85 & 0x80);
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sclp.has_64bscao = !!(sccb->fac116 & 0x80);
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sclp.has_cmma = !!(sccb->fac116 & 0x40);
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sclp.has_esca = !!(sccb->fac116 & 0x08);
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sclp.has_pfmfi = !!(sccb->fac117 & 0x40);
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sclp.has_ibs = !!(sccb->fac117 & 0x20);
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sclp.has_gisaf = !!(sccb->fac118 & 0x08);
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sclp.has_hvs = !!(sccb->fac119 & 0x80);
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sclp.has_kss = !!(sccb->fac98 & 0x01);
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if (sccb->fac85 & 0x02)
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S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
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if (sccb->fac91 & 0x40)
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S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST;
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sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
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sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
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sclp.rzm <<= 20;
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sclp.ibc = sccb->ibc;
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if (sccb->hamaxpow && sccb->hamaxpow < 64)
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sclp.hamax = (1UL << sccb->hamaxpow) - 1;
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else
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sclp.hamax = U64_MAX;
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if (!sccb->hcpua) {
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if (MACHINE_IS_VM)
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sclp.max_cores = 64;
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else
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sclp.max_cores = sccb->ncpurl;
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} else {
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sclp.max_cores = sccb->hcpua + 1;
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}
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boot_cpu_address = stap();
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cpue = (void *)sccb + sccb->cpuoff;
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for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
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if (boot_cpu_address != cpue->core_id)
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continue;
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sclp.has_siif = cpue->siif;
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sclp.has_sigpif = cpue->sigpif;
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sclp.has_sief2 = cpue->sief2;
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sclp.has_gpere = cpue->gpere;
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sclp.has_ib = cpue->ib;
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sclp.has_cei = cpue->cei;
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sclp.has_skey = cpue->skey;
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break;
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}
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/* Save IPL information */
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sclp_ipl_info.is_valid = 1;
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if (sccb->fac91 & 0x2)
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sclp_ipl_info.has_dump = 1;
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memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
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sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
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sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
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sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
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sclp.hmfai = sccb->hmfai;
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}
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/*
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* This function will be called after sclp_early_facilities_detect(), which gets
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* called from early.c code. The sclp_early_facilities_detect() function retrieves
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* and saves the IPL information.
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*/
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void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
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{
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*info = sclp_ipl_info;
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}
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static struct sclp_core_info sclp_early_core_info __initdata;
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static int sclp_early_core_info_valid __initdata;
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static void __init sclp_early_init_core_info(struct read_cpu_info_sccb *sccb)
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{
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if (!SCLP_HAS_CPU_INFO)
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return;
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memset(sccb, 0, sizeof(*sccb));
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sccb->header.length = sizeof(*sccb);
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if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb))
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return;
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if (sccb->header.response_code != 0x0010)
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return;
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sclp_fill_core_info(&sclp_early_core_info, sccb);
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sclp_early_core_info_valid = 1;
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}
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int __init sclp_early_get_core_info(struct sclp_core_info *info)
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{
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if (!sclp_early_core_info_valid)
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return -EIO;
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*info = sclp_early_core_info;
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return 0;
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}
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static long __init sclp_early_hsa_size_init(struct sdias_sccb *sccb)
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{
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memset(sccb, 0, sizeof(*sccb));
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sccb->hdr.length = sizeof(*sccb);
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sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf);
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sccb->evbuf.hdr.type = EVTYP_SDIAS;
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sccb->evbuf.event_qual = SDIAS_EQ_SIZE;
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sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP;
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sccb->evbuf.event_id = 4712;
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sccb->evbuf.dbs = 1;
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if (sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_DATA, sccb))
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return -EIO;
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if (sccb->hdr.response_code != 0x20)
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return -EIO;
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if (sccb->evbuf.blk_cnt == 0)
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return 0;
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return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
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}
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static long __init sclp_early_hsa_copy_wait(struct sdias_sccb *sccb)
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{
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memset(sccb, 0, PAGE_SIZE);
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sccb->hdr.length = PAGE_SIZE;
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if (sclp_early_cmd(SCLP_CMDW_READ_EVENT_DATA, sccb))
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return -EIO;
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if ((sccb->hdr.response_code != 0x20) && (sccb->hdr.response_code != 0x220))
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return -EIO;
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if (sccb->evbuf.blk_cnt == 0)
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return 0;
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return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
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}
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static void __init sclp_early_hsa_size_detect(void *sccb)
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{
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unsigned long flags;
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long size = -EIO;
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raw_local_irq_save(flags);
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if (sclp_early_set_event_mask(sccb, EVTYP_SDIAS_MASK, EVTYP_SDIAS_MASK))
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goto out;
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size = sclp_early_hsa_size_init(sccb);
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/* First check for synchronous response (LPAR) */
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if (size)
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goto out_mask;
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if (!(S390_lowcore.ext_params & 1))
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sclp_early_wait_irq();
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size = sclp_early_hsa_copy_wait(sccb);
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out_mask:
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sclp_early_set_event_mask(sccb, 0, 0);
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out:
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raw_local_irq_restore(flags);
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if (size > 0)
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sclp.hsa_size = size;
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}
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static void __init sclp_early_console_detect(struct init_sccb *sccb)
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{
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if (sccb->header.response_code != 0x20)
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return;
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if (sclp_early_con_check_vt220(sccb))
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sclp.has_vt220 = 1;
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if (sclp_early_con_check_linemode(sccb))
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sclp.has_linemode = 1;
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}
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void __init sclp_early_detect(void)
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{
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void *sccb = &sclp_early_sccb;
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sclp_early_facilities_detect(sccb);
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sclp_early_init_core_info(sccb);
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sclp_early_hsa_size_detect(sccb);
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/*
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* Turn off SCLP event notifications. Also save remote masks in the
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* sccb. These are sufficient to detect sclp console capabilities.
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*/
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sclp_early_set_event_mask(sccb, 0, 0);
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sclp_early_console_detect(sccb);
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}
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