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