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 | |
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 | */ |
120 | void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info) |
121 | { |
122 | *info = sclp_ipl_info; |
123 | } |
124 | |
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(size: 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(ptr: sccb, size: length); |
152 | return rc; |
153 | } |
154 | |
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 | |
167 | void __init __no_sanitize_address sclp_early_adjust_va(void) |
168 | { |
169 | sclp_early_sccb = __va((unsigned long)sclp_early_sccb); |
170 | } |
171 | |
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, receive_mask: 0, send_mask: 0); |
183 | sclp_early_console_detect(sccb); |
184 | } |
185 | |