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