xref: /openbmc/linux/drivers/s390/char/sclp_early.c (revision 8cf57d72)
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/ctl_reg.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 
21 static struct sclp_ipl_info sclp_ipl_info;
22 
23 struct sclp_info sclp;
24 EXPORT_SYMBOL(sclp);
25 
sclp_early_facilities_detect(void)26 static 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  */
sclp_early_get_ipl_info(struct sclp_ipl_info * info)120 void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
121 {
122 	*info = sclp_ipl_info;
123 }
124 
sclp_early_get_core_info(struct sclp_core_info * info)125 int __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);
150 out:
151 	memblock_free(sccb, length);
152 	return rc;
153 }
154 
sclp_early_console_detect(struct init_sccb * sccb)155 static 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 
sclp_early_adjust_va(void)167 void __init __no_sanitize_address sclp_early_adjust_va(void)
168 {
169 	sclp_early_sccb = __va((unsigned long)sclp_early_sccb);
170 }
171 
sclp_early_detect(void)172 void __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