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