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_kss = !!(sccb->fac98 & 0x01);
48	sclp.has_aisii = !!(sccb->fac118 & 0x40);
49	sclp.has_aeni = !!(sccb->fac118 & 0x20);
50	sclp.has_aisi = !!(sccb->fac118 & 0x10);
51	sclp.has_zpci_lsi = !!(sccb->fac118 & 0x01);
52	if (sccb->fac85 & 0x02)
53		S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
54	if (sccb->fac91 & 0x40)
55		S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST;
56	if (sccb->cpuoff > 134) {
57		sclp.has_diag318 = !!(sccb->byte_134 & 0x80);
58		sclp.has_diag320 = !!(sccb->byte_134 & 0x04);
59		sclp.has_iplcc = !!(sccb->byte_134 & 0x02);
60	}
61	if (sccb->cpuoff > 137) {
62		sclp.has_sipl = !!(sccb->cbl & 0x4000);
63		sclp.has_sipl_eckd = !!(sccb->cbl & 0x2000);
64	}
65	sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
66	sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
67	sclp.rzm <<= 20;
68	sclp.ibc = sccb->ibc;
69
70	if (sccb->hamaxpow && sccb->hamaxpow < 64)
71		sclp.hamax = (1UL << sccb->hamaxpow) - 1;
72	else
73		sclp.hamax = U64_MAX;
74
75	if (!sccb->hcpua) {
76		if (MACHINE_IS_VM)
77			sclp.max_cores = 64;
78		else
79			sclp.max_cores = sccb->ncpurl;
80	} else {
81		sclp.max_cores = sccb->hcpua + 1;
82	}
83
84	boot_cpu_address = stap();
85	cpue = (void *)sccb + sccb->cpuoff;
86	for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
87		if (boot_cpu_address != cpue->core_id)
88			continue;
89		sclp.has_siif = cpue->siif;
90		sclp.has_sigpif = cpue->sigpif;
91		sclp.has_sief2 = cpue->sief2;
92		sclp.has_gpere = cpue->gpere;
93		sclp.has_ib = cpue->ib;
94		sclp.has_cei = cpue->cei;
95		sclp.has_skey = cpue->skey;
96		break;
97	}
98
99	/* Save IPL information */
100	sclp_ipl_info.is_valid = 1;
101	if (sccb->fac91 & 0x2)
102		sclp_ipl_info.has_dump = 1;
103	memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
104
105	if (sccb->hsa_size)
106		sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE;
107	sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
108	sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
109	sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
110
111	sclp.hmfai = sccb->hmfai;
112	sclp.has_dirq = !!(sccb->cpudirq & 0x80);
113}
114
115/*
116 * This function will be called after sclp_early_facilities_detect(), which gets
117 * called from early.c code. The sclp_early_facilities_detect() function retrieves
118 * and saves the IPL information.
119 */
120void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
121{
122	*info = sclp_ipl_info;
123}
124
125int __init sclp_early_get_core_info(struct sclp_core_info *info)
126{
127	struct read_cpu_info_sccb *sccb;
128	int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
129	int rc = 0;
130
131	if (!SCLP_HAS_CPU_INFO)
132		return -EOPNOTSUPP;
133
134	sccb = memblock_alloc_low(length, PAGE_SIZE);
135	if (!sccb)
136		return -ENOMEM;
137
138	memset(sccb, 0, length);
139	sccb->header.length = length;
140	sccb->header.control_mask[2] = 0x80;
141	if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) {
142		rc = -EIO;
143		goto out;
144	}
145	if (sccb->header.response_code != 0x0010) {
146		rc = -EIO;
147		goto out;
148	}
149	sclp_fill_core_info(info, sccb);
150out:
151	memblock_free(sccb, length);
152	return rc;
153}
154
155static void __init sclp_early_console_detect(struct init_sccb *sccb)
156{
157	if (sccb->header.response_code != 0x20)
158		return;
159
160	if (sclp_early_con_check_vt220(sccb))
161		sclp.has_vt220 = 1;
162
163	if (sclp_early_con_check_linemode(sccb))
164		sclp.has_linemode = 1;
165}
166
167void __init __no_sanitize_address sclp_early_adjust_va(void)
168{
169	sclp_early_sccb = __va((unsigned long)sclp_early_sccb);
170}
171
172void __init sclp_early_detect(void)
173{
174	void *sccb = sclp_early_sccb;
175
176	sclp_early_facilities_detect();
177
178	/*
179	 * Turn off SCLP event notifications.  Also save remote masks in the
180	 * sccb.  These are sufficient to detect sclp console capabilities.
181	 */
182	sclp_early_set_event_mask(sccb, 0, 0);
183	sclp_early_console_detect(sccb);
184}
185