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
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_wti = !!(sccb->fac119 & 0x40);
48 sclp.has_kss = !!(sccb->fac98 & 0x01);
49 sclp.has_aisii = !!(sccb->fac118 & 0x40);
50 sclp.has_aeni = !!(sccb->fac118 & 0x20);
51 sclp.has_aisi = !!(sccb->fac118 & 0x10);
52 sclp.has_zpci_lsi = !!(sccb->fac118 & 0x01);
53 if (sccb->fac85 & 0x02)
54 get_lowcore()->machine_flags |= MACHINE_FLAG_ESOP;
55 if (sccb->fac91 & 0x40)
56 get_lowcore()->machine_flags |= MACHINE_FLAG_TLB_GUEST;
57 sclp.has_diag204_bif = !!(sccb->fac98 & 0x80);
58 if (sccb->cpuoff > 134) {
59 sclp.has_diag318 = !!(sccb->byte_134 & 0x80);
60 sclp.has_diag320 = !!(sccb->byte_134 & 0x04);
61 sclp.has_iplcc = !!(sccb->byte_134 & 0x02);
62 }
63 if (sccb->cpuoff > 137) {
64 sclp.has_sipl = !!(sccb->cbl & 0x4000);
65 sclp.has_sipl_eckd = !!(sccb->cbl & 0x2000);
66 }
67 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
68 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
69 sclp.rzm <<= 20;
70 sclp.ibc = sccb->ibc;
71
72 if (sccb->hamaxpow && sccb->hamaxpow < 64)
73 sclp.hamax = (1UL << sccb->hamaxpow) - 1;
74 else
75 sclp.hamax = U64_MAX;
76
77 if (!sccb->hcpua) {
78 if (MACHINE_IS_VM)
79 sclp.max_cores = 64;
80 else
81 sclp.max_cores = sccb->ncpurl;
82 } else {
83 sclp.max_cores = sccb->hcpua + 1;
84 }
85
86 boot_cpu_address = stap();
87 cpue = (void *)sccb + sccb->cpuoff;
88 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
89 if (boot_cpu_address != cpue->core_id)
90 continue;
91 sclp.has_siif = cpue->siif;
92 sclp.has_sigpif = cpue->sigpif;
93 sclp.has_sief2 = cpue->sief2;
94 sclp.has_gpere = cpue->gpere;
95 sclp.has_ib = cpue->ib;
96 sclp.has_cei = cpue->cei;
97 sclp.has_skey = cpue->skey;
98 break;
99 }
100
101 /* Save IPL information */
102 sclp_ipl_info.is_valid = 1;
103 if (sccb->fac91 & 0x2)
104 sclp_ipl_info.has_dump = 1;
105 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
106
107 if (sccb->hsa_size)
108 sclp.hsa_size = (sccb->hsa_size - 1) * PAGE_SIZE;
109 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
110 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
111 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
112
113 sclp.hmfai = sccb->hmfai;
114 sclp.has_dirq = !!(sccb->cpudirq & 0x80);
115 }
116
117 /*
118 * This function will be called after sclp_early_facilities_detect(), which gets
119 * called from early.c code. The sclp_early_facilities_detect() function retrieves
120 * and saves the IPL information.
121 */
sclp_early_get_ipl_info(struct sclp_ipl_info * info)122 void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
123 {
124 *info = sclp_ipl_info;
125 }
126
sclp_early_get_core_info(struct sclp_core_info * info)127 int __init sclp_early_get_core_info(struct sclp_core_info *info)
128 {
129 struct read_cpu_info_sccb *sccb;
130 int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
131 int rc = 0;
132
133 if (!SCLP_HAS_CPU_INFO)
134 return -EOPNOTSUPP;
135
136 sccb = memblock_alloc_low(length, PAGE_SIZE);
137 if (!sccb)
138 return -ENOMEM;
139
140 memset(sccb, 0, length);
141 sccb->header.length = length;
142 sccb->header.control_mask[2] = 0x80;
143 if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) {
144 rc = -EIO;
145 goto out;
146 }
147 if (sccb->header.response_code != 0x0010) {
148 rc = -EIO;
149 goto out;
150 }
151 sclp_fill_core_info(info, sccb);
152 out:
153 memblock_free(sccb, length);
154 return rc;
155 }
156
sclp_early_console_detect(struct init_sccb * sccb)157 static void __init sclp_early_console_detect(struct init_sccb *sccb)
158 {
159 if (sccb->header.response_code != 0x20)
160 return;
161
162 if (sclp_early_con_check_vt220(sccb))
163 sclp.has_vt220 = 1;
164
165 if (sclp_early_con_check_linemode(sccb))
166 sclp.has_linemode = 1;
167 }
168
sclp_early_adjust_va(void)169 void __init __no_sanitize_address sclp_early_adjust_va(void)
170 {
171 sclp_early_sccb = __va((unsigned long)sclp_early_sccb);
172 }
173
sclp_early_detect(void)174 void __init sclp_early_detect(void)
175 {
176 void *sccb = sclp_early_sccb;
177
178 sclp_early_facilities_detect();
179
180 /*
181 * Turn off SCLP event notifications. Also save remote masks in the
182 * sccb. These are sufficient to detect sclp console capabilities.
183 */
184 sclp_early_set_event_mask(sccb, 0, 0);
185 sclp_early_console_detect(sccb);
186 }
187