summaryrefslogtreecommitdiffstats
path: root/drivers/s390/char/sclp_early.c
blob: fdc8668f3fba719995beff9a8fa9db7fa49a5645 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
// 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 <linux/memblock.h>
#include <asm/ctl_reg.h>
#include <asm/sclp.h>
#include <asm/ipl.h>
#include <asm/setup.h>
#include <asm/facility.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(void)
{
	struct sclp_core_entry *cpue;
	struct read_info_sccb *sccb;
	u16 boot_cpu_address, cpu;

	sccb = sclp_early_get_info();
	if (!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);
	sclp.has_aisii = !!(sccb->fac118 & 0x40);
	sclp.has_aeni = !!(sccb->fac118 & 0x20);
	sclp.has_aisi = !!(sccb->fac118 & 0x10);
	sclp.has_zpci_lsi = !!(sccb->fac118 & 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);
		sclp.has_diag320 = !!(sccb->byte_134 & 0x04);
		sclp.has_iplcc = !!(sccb->byte_134 & 0x02);
	}
	if (sccb->cpuoff > 137) {
		sclp.has_sipl = !!(sccb->cbl & 0x4000);
		sclp.has_sipl_eckd = !!(sccb->cbl & 0x2000);
	}
	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;
}

int __init sclp_early_get_core_info(struct sclp_core_info *info)
{
	struct read_cpu_info_sccb *sccb;
	int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
	int rc = 0;

	if (!SCLP_HAS_CPU_INFO)
		return -EOPNOTSUPP;

	sccb = memblock_alloc_low(length, PAGE_SIZE);
	if (!sccb)
		return -ENOMEM;

	memset(sccb, 0, length);
	sccb->header.length = length;
	sccb->header.control_mask[2] = 0x80;
	if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) {
		rc = -EIO;
		goto out;
	}
	if (sccb->header.response_code != 0x0010) {
		rc = -EIO;
		goto out;
	}
	sclp_fill_core_info(info, sccb);
out:
	memblock_free(sccb, length);
	return rc;
}

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 __no_sanitize_address sclp_early_adjust_va(void)
{
	sclp_early_sccb = __va((unsigned long)sclp_early_sccb);
}

void __init sclp_early_detect(void)
{
	void *sccb = sclp_early_sccb;

	sclp_early_facilities_detect();

	/*
	 * 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);
}