1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * SCLP early driver
  4 *
  5 * Copyright IBM Corp. 2013
  6 */
  7
  8#define KMSG_COMPONENT "sclp_early"
  9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 10
 11#include <linux/errno.h>
 12#include <linux/memblock.h>
 13#include <asm/ctlreg.h>
 14#include <asm/sclp.h>
 15#include <asm/ipl.h>
 16#include <asm/setup.h>
 17#include <asm/facility.h>
 18#include "sclp_sdias.h"
 19#include "sclp.h"
 20
 21static struct sclp_ipl_info sclp_ipl_info;
 22
 23struct sclp_info sclp;
 24EXPORT_SYMBOL(sclp);
 25
 26static void __init sclp_early_facilities_detect(void)
 27{
 28	struct sclp_core_entry *cpue;
 29	struct read_info_sccb *sccb;
 30	u16 boot_cpu_address, cpu;
 31
 32	sccb = sclp_early_get_info();
 33	if (!sccb)
 34		return;
 35
 36	sclp.facilities = sccb->facilities;
 37	sclp.has_sprp = !!(sccb->fac84 & 0x02);
 38	sclp.has_core_type = !!(sccb->fac84 & 0x01);
 39	sclp.has_gsls = !!(sccb->fac85 & 0x80);
 40	sclp.has_64bscao = !!(sccb->fac116 & 0x80);
 41	sclp.has_cmma = !!(sccb->fac116 & 0x40);
 42	sclp.has_esca = !!(sccb->fac116 & 0x08);
 43	sclp.has_pfmfi = !!(sccb->fac117 & 0x40);
 44	sclp.has_ibs = !!(sccb->fac117 & 0x20);
 45	sclp.has_gisaf = !!(sccb->fac118 & 0x08);
 46	sclp.has_hvs = !!(sccb->fac119 & 0x80);
 47	sclp.has_wti = !!(sccb->fac119 & 0x40);
 48	sclp.has_kss = !!(sccb->fac98 & 0x01);
 49	sclp.has_aisii = !!(sccb->fac118 & 0x40);
 50	sclp.has_aeni = !!(sccb->fac118 & 0x20);
 51	sclp.has_aisi = !!(sccb->fac118 & 0x10);
 52	sclp.has_zpci_lsi = !!(sccb->fac118 & 0x01);
 53	if (sccb->fac85 & 0x02)
 54		get_lowcore()->machine_flags |= MACHINE_FLAG_ESOP;
 55	if (sccb->fac91 & 0x40)
 56		get_lowcore()->machine_flags |= MACHINE_FLAG_TLB_GUEST;
 57	sclp.has_diag204_bif = !!(sccb->fac98 & 0x80);
 58	if (sccb->cpuoff > 134) {
 59		sclp.has_diag318 = !!(sccb->byte_134 & 0x80);
 60		sclp.has_diag320 = !!(sccb->byte_134 & 0x04);
 61		sclp.has_iplcc = !!(sccb->byte_134 & 0x02);
 62	}
 63	if (sccb->cpuoff > 137) {
 64		sclp.has_sipl = !!(sccb->cbl & 0x4000);
 65		sclp.has_sipl_eckd = !!(sccb->cbl & 0x2000);
 66	}
 67	sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
 68	sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
 69	sclp.rzm <<= 20;
 70	sclp.ibc = sccb->ibc;
 71
 72	if (sccb->hamaxpow && sccb->hamaxpow < 64)
 73		sclp.hamax = (1UL << sccb->hamaxpow) - 1;
 74	else
 75		sclp.hamax = U64_MAX;
 76
 77	if (!sccb->hcpua) {
 78		if (MACHINE_IS_VM)
 79			sclp.max_cores = 64;
 80		else
 81			sclp.max_cores = sccb->ncpurl;
 82	} else {
 83		sclp.max_cores = sccb->hcpua + 1;
 84	}
 85
 86	boot_cpu_address = stap();
 87	cpue = (void *)sccb + sccb->cpuoff;
 88	for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
 89		if (boot_cpu_address != cpue->core_id)
 90			continue;
 91		sclp.has_siif = cpue->siif;
 92		sclp.has_sigpif = cpue->sigpif;
 93		sclp.has_sief2 = cpue->sief2;
 94		sclp.has_gpere = cpue->gpere;
 95		sclp.has_ib = cpue->ib;
 96		sclp.has_cei = cpue->cei;
 97		sclp.has_skey = cpue->skey;
 98		break;
 99	}
100
101	/* Save IPL information */
102	sclp_ipl_info.is_valid = 1;
103	if (sccb->fac91 & 0x2)
104		sclp_ipl_info.has_dump = 1;
105	memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
106
107	if (sccb->hsa_size)
108		sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE;
109	sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
110	sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
111	sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
112
113	sclp.hmfai = sccb->hmfai;
114	sclp.has_dirq = !!(sccb->cpudirq & 0x80);
115}
116
117/*
118 * This function will be called after sclp_early_facilities_detect(), which gets
119 * called from early.c code. The sclp_early_facilities_detect() function retrieves
120 * and saves the IPL information.
121 */
122void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
123{
124	*info = sclp_ipl_info;
125}
126
127int __init sclp_early_get_core_info(struct sclp_core_info *info)
128{
129	struct read_cpu_info_sccb *sccb;
130	int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
131	int rc = 0;
132
133	if (!SCLP_HAS_CPU_INFO)
134		return -EOPNOTSUPP;
135
136	sccb = memblock_alloc_low(length, PAGE_SIZE);
137	if (!sccb)
138		return -ENOMEM;
139
140	memset(sccb, 0, length);
141	sccb->header.length = length;
142	sccb->header.control_mask[2] = 0x80;
143	if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) {
144		rc = -EIO;
145		goto out;
146	}
147	if (sccb->header.response_code != 0x0010) {
148		rc = -EIO;
149		goto out;
150	}
151	sclp_fill_core_info(info, sccb);
152out:
153	memblock_free(sccb, length);
154	return rc;
155}
156
157static void __init sclp_early_console_detect(struct init_sccb *sccb)
158{
159	if (sccb->header.response_code != 0x20)
160		return;
161
162	if (sclp_early_con_check_vt220(sccb))
163		sclp.has_vt220 = 1;
164
165	if (sclp_early_con_check_linemode(sccb))
166		sclp.has_linemode = 1;
167}
168
169void __init __no_sanitize_address sclp_early_adjust_va(void)
170{
171	sclp_early_sccb = __va((unsigned long)sclp_early_sccb);
172}
173
174void __init sclp_early_detect(void)
175{
176	void *sccb = sclp_early_sccb;
177
178	sclp_early_facilities_detect();
179
180	/*
181	 * Turn off SCLP event notifications.  Also save remote masks in the
182	 * sccb.  These are sufficient to detect sclp console capabilities.
183	 */
184	sclp_early_set_event_mask(sccb, 0, 0);
185	sclp_early_console_detect(sccb);
186}