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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e657d8fe MH |
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 | ||
a313bdc5 | 11 | #include <linux/errno.h> |
acf6a004 | 12 | #include <asm/ctl_reg.h> |
e657d8fe MH |
13 | #include <asm/sclp.h> |
14 | #include <asm/ipl.h> | |
15 | #include "sclp_sdias.h" | |
16 | #include "sclp.h" | |
17 | ||
acf6a004 MH |
18 | #define SCLP_CMDW_READ_SCP_INFO 0x00020001 |
19 | #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001 | |
20 | ||
21 | struct read_info_sccb { | |
22 | struct sccb_header header; /* 0-7 */ | |
23 | u16 rnmax; /* 8-9 */ | |
24 | u8 rnsize; /* 10 */ | |
10ad34bc | 25 | u8 _pad_11[16 - 11]; /* 11-15 */ |
cf813db0 | 26 | u16 ncpurl; /* 16-17 */ |
217a4406 | 27 | u16 cpuoff; /* 18-19 */ |
10ad34bc | 28 | u8 _pad_20[24 - 20]; /* 20-23 */ |
acf6a004 | 29 | u8 loadparm[8]; /* 24-31 */ |
10ad34bc MS |
30 | u8 _pad_32[42 - 32]; /* 32-41 */ |
31 | u8 fac42; /* 42 */ | |
32 | u8 fac43; /* 43 */ | |
33 | u8 _pad_44[48 - 44]; /* 44-47 */ | |
acf6a004 | 34 | u64 facilities; /* 48-55 */ |
10ad34bc MS |
35 | u8 _pad_56[66 - 56]; /* 56-65 */ |
36 | u8 fac66; /* 66 */ | |
37 | u8 _pad_67[76 - 67]; /* 67-83 */ | |
570126d3 | 38 | u32 ibc; /* 76-79 */ |
10ad34bc | 39 | u8 _pad80[84 - 80]; /* 80-83 */ |
acf6a004 MH |
40 | u8 fac84; /* 84 */ |
41 | u8 fac85; /* 85 */ | |
10ad34bc | 42 | u8 _pad_86[91 - 86]; /* 86-90 */ |
118bd31b | 43 | u8 fac91; /* 91 */ |
71cb1bf6 FA |
44 | u8 _pad_92[98 - 92]; /* 92-97 */ |
45 | u8 fac98; /* 98 */ | |
32e6b236 | 46 | u8 hamaxpow; /* 99 */ |
acf6a004 MH |
47 | u32 rnsize2; /* 100-103 */ |
48 | u64 rnmax2; /* 104-111 */ | |
f7ba1d34 ED |
49 | u8 _pad_112[116 - 112]; /* 112-115 */ |
50 | u8 fac116; /* 116 */ | |
a0eb55e6 DH |
51 | u8 fac117; /* 117 */ |
52 | u8 _pad_118; /* 118 */ | |
f7ba1d34 | 53 | u8 fac119; /* 119 */ |
cf813db0 | 54 | u16 hcpua; /* 120-121 */ |
154fa27e AY |
55 | u8 _pad_122[124 - 122]; /* 122-123 */ |
56 | u32 hmfai; /* 124-127 */ | |
57 | u8 _pad_128[4096 - 128]; /* 128-4095 */ | |
acf6a004 MH |
58 | } __packed __aligned(PAGE_SIZE); |
59 | ||
333cce91 | 60 | static struct sclp_ipl_info sclp_ipl_info; |
e657d8fe | 61 | |
37c5f6c8 DH |
62 | struct sclp_info sclp; |
63 | EXPORT_SYMBOL(sclp); | |
acf6a004 | 64 | |
d5ab7a34 | 65 | static int __init sclp_early_read_info(struct read_info_sccb *sccb) |
acf6a004 | 66 | { |
f694bb3a | 67 | int i; |
acf6a004 MH |
68 | sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, |
69 | SCLP_CMDW_READ_SCP_INFO}; | |
70 | ||
acf6a004 | 71 | for (i = 0; i < ARRAY_SIZE(commands); i++) { |
f694bb3a HC |
72 | memset(sccb, 0, sizeof(*sccb)); |
73 | sccb->header.length = sizeof(*sccb); | |
74 | sccb->header.function_code = 0x80; | |
75 | sccb->header.control_mask[2] = 0x80; | |
76 | if (sclp_early_cmd(commands[i], sccb)) | |
acf6a004 | 77 | break; |
333cce91 HB |
78 | if (sccb->header.response_code == 0x10) |
79 | return 0; | |
acf6a004 MH |
80 | if (sccb->header.response_code != 0x1f0) |
81 | break; | |
82 | } | |
333cce91 | 83 | return -EIO; |
acf6a004 MH |
84 | } |
85 | ||
d5ab7a34 | 86 | static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb) |
acf6a004 | 87 | { |
d08d9430 | 88 | struct sclp_core_entry *cpue; |
217a4406 HC |
89 | u16 boot_cpu_address, cpu; |
90 | ||
d5ab7a34 | 91 | if (sclp_early_read_info(sccb)) |
acf6a004 MH |
92 | return; |
93 | ||
78335a30 | 94 | sclp.facilities = sccb->facilities; |
37c5f6c8 | 95 | sclp.has_sprp = !!(sccb->fac84 & 0x02); |
d08d9430 | 96 | sclp.has_core_type = !!(sccb->fac84 & 0x01); |
5236c751 | 97 | sclp.has_gsls = !!(sccb->fac85 & 0x80); |
4013ade3 | 98 | sclp.has_64bscao = !!(sccb->fac116 & 0x80); |
09be9cb9 | 99 | sclp.has_cmma = !!(sccb->fac116 & 0x40); |
f7ba1d34 | 100 | sclp.has_esca = !!(sccb->fac116 & 0x08); |
a0eb55e6 | 101 | sclp.has_pfmfi = !!(sccb->fac117 & 0x40); |
9c375490 | 102 | sclp.has_ibs = !!(sccb->fac117 & 0x20); |
f7ba1d34 | 103 | sclp.has_hvs = !!(sccb->fac119 & 0x80); |
71cb1bf6 | 104 | sclp.has_kss = !!(sccb->fac98 & 0x01); |
acf6a004 MH |
105 | if (sccb->fac85 & 0x02) |
106 | S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; | |
118bd31b MS |
107 | if (sccb->fac91 & 0x40) |
108 | S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_GUEST; | |
37c5f6c8 DH |
109 | sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; |
110 | sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; | |
111 | sclp.rzm <<= 20; | |
112 | sclp.ibc = sccb->ibc; | |
333cce91 | 113 | |
32e6b236 GH |
114 | if (sccb->hamaxpow && sccb->hamaxpow < 64) |
115 | sclp.hamax = (1UL << sccb->hamaxpow) - 1; | |
116 | else | |
117 | sclp.hamax = U64_MAX; | |
118 | ||
cf813db0 HC |
119 | if (!sccb->hcpua) { |
120 | if (MACHINE_IS_VM) | |
d08d9430 | 121 | sclp.max_cores = 64; |
cf813db0 | 122 | else |
d08d9430 | 123 | sclp.max_cores = sccb->ncpurl; |
cf813db0 | 124 | } else { |
d08d9430 | 125 | sclp.max_cores = sccb->hcpua + 1; |
cf813db0 HC |
126 | } |
127 | ||
217a4406 HC |
128 | boot_cpu_address = stap(); |
129 | cpue = (void *)sccb + sccb->cpuoff; | |
130 | for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { | |
10ad34bc | 131 | if (boot_cpu_address != cpue->core_id) |
217a4406 | 132 | continue; |
37c5f6c8 DH |
133 | sclp.has_siif = cpue->siif; |
134 | sclp.has_sigpif = cpue->sigpif; | |
8dfd523f | 135 | sclp.has_sief2 = cpue->sief2; |
b9e28897 | 136 | sclp.has_gpere = cpue->gpere; |
72cd82b9 | 137 | sclp.has_ib = cpue->ib; |
4a5c3e08 | 138 | sclp.has_cei = cpue->cei; |
23861451 | 139 | sclp.has_skey = cpue->skey; |
217a4406 HC |
140 | break; |
141 | } | |
142 | ||
333cce91 HB |
143 | /* Save IPL information */ |
144 | sclp_ipl_info.is_valid = 1; | |
118bd31b | 145 | if (sccb->fac91 & 0x2) |
333cce91 HB |
146 | sclp_ipl_info.has_dump = 1; |
147 | memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); | |
10ad34bc | 148 | |
37c5f6c8 DH |
149 | sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; |
150 | sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; | |
37c5f6c8 | 151 | sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; |
154fa27e AY |
152 | |
153 | sclp.hmfai = sccb->hmfai; | |
acf6a004 MH |
154 | } |
155 | ||
acf6a004 | 156 | /* |
d5ab7a34 HC |
157 | * This function will be called after sclp_early_facilities_detect(), which gets |
158 | * called from early.c code. The sclp_early_facilities_detect() function retrieves | |
333cce91 | 159 | * and saves the IPL information. |
acf6a004 | 160 | */ |
d5ab7a34 | 161 | void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info) |
acf6a004 | 162 | { |
333cce91 | 163 | *info = sclp_ipl_info; |
acf6a004 MH |
164 | } |
165 | ||
d5ab7a34 HC |
166 | static struct sclp_core_info sclp_early_core_info __initdata; |
167 | static int sclp_early_core_info_valid __initdata; | |
e657d8fe | 168 | |
d5ab7a34 | 169 | static void __init sclp_early_init_core_info(struct read_cpu_info_sccb *sccb) |
af51160e | 170 | { |
af51160e HC |
171 | if (!SCLP_HAS_CPU_INFO) |
172 | return; | |
173 | memset(sccb, 0, sizeof(*sccb)); | |
174 | sccb->header.length = sizeof(*sccb); | |
f694bb3a | 175 | if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb)) |
af51160e HC |
176 | return; |
177 | if (sccb->header.response_code != 0x0010) | |
178 | return; | |
d5ab7a34 HC |
179 | sclp_fill_core_info(&sclp_early_core_info, sccb); |
180 | sclp_early_core_info_valid = 1; | |
af51160e HC |
181 | } |
182 | ||
d5ab7a34 | 183 | int __init sclp_early_get_core_info(struct sclp_core_info *info) |
af51160e | 184 | { |
d5ab7a34 | 185 | if (!sclp_early_core_info_valid) |
af51160e | 186 | return -EIO; |
d5ab7a34 | 187 | *info = sclp_early_core_info; |
af51160e HC |
188 | return 0; |
189 | } | |
190 | ||
d5ab7a34 | 191 | static long __init sclp_early_hsa_size_init(struct sdias_sccb *sccb) |
e657d8fe | 192 | { |
d5ab7a34 HC |
193 | memset(sccb, 0, sizeof(*sccb)); |
194 | sccb->hdr.length = sizeof(*sccb); | |
195 | sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf); | |
196 | sccb->evbuf.hdr.type = EVTYP_SDIAS; | |
197 | sccb->evbuf.event_qual = SDIAS_EQ_SIZE; | |
198 | sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP; | |
199 | sccb->evbuf.event_id = 4712; | |
200 | sccb->evbuf.dbs = 1; | |
201 | if (sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_DATA, sccb)) | |
e657d8fe | 202 | return -EIO; |
f694bb3a HC |
203 | if (sccb->hdr.response_code != 0x20) |
204 | return -EIO; | |
9499934f MH |
205 | if (sccb->evbuf.blk_cnt == 0) |
206 | return 0; | |
207 | return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; | |
e657d8fe MH |
208 | } |
209 | ||
d5ab7a34 | 210 | static long __init sclp_early_hsa_copy_wait(struct sdias_sccb *sccb) |
e657d8fe | 211 | { |
e657d8fe | 212 | memset(sccb, 0, PAGE_SIZE); |
d5ab7a34 HC |
213 | sccb->hdr.length = PAGE_SIZE; |
214 | if (sclp_early_cmd(SCLP_CMDW_READ_EVENT_DATA, sccb)) | |
e657d8fe | 215 | return -EIO; |
f694bb3a HC |
216 | if ((sccb->hdr.response_code != 0x20) && (sccb->hdr.response_code != 0x220)) |
217 | return -EIO; | |
d5ab7a34 | 218 | if (sccb->evbuf.blk_cnt == 0) |
9499934f | 219 | return 0; |
d5ab7a34 | 220 | return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; |
e657d8fe MH |
221 | } |
222 | ||
d5ab7a34 | 223 | static void __init sclp_early_hsa_size_detect(void *sccb) |
e657d8fe | 224 | { |
d5ab7a34 HC |
225 | unsigned long flags; |
226 | long size = -EIO; | |
e657d8fe | 227 | |
d5ab7a34 HC |
228 | raw_local_irq_save(flags); |
229 | if (sclp_early_set_event_mask(sccb, EVTYP_SDIAS_MASK, EVTYP_SDIAS_MASK)) | |
e657d8fe | 230 | goto out; |
d5ab7a34 HC |
231 | size = sclp_early_hsa_size_init(sccb); |
232 | /* First check for synchronous response (LPAR) */ | |
233 | if (size) | |
234 | goto out_mask; | |
235 | if (!(S390_lowcore.ext_params & 1)) | |
236 | sclp_early_wait_irq(); | |
237 | size = sclp_early_hsa_copy_wait(sccb); | |
238 | out_mask: | |
239 | sclp_early_set_event_mask(sccb, 0, 0); | |
e657d8fe | 240 | out: |
d5ab7a34 HC |
241 | raw_local_irq_restore(flags); |
242 | if (size > 0) | |
243 | sclp.hsa_size = size; | |
52733e01 HB |
244 | } |
245 | ||
d5ab7a34 | 246 | static void __init sclp_early_console_detect(struct init_sccb *sccb) |
52733e01 HB |
247 | { |
248 | if (sccb->header.response_code != 0x20) | |
249 | return; | |
250 | ||
251 | if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) | |
37c5f6c8 | 252 | sclp.has_vt220 = 1; |
52733e01 | 253 | |
d5ab7a34 | 254 | if (sclp_early_con_check_linemode(sccb)) |
37c5f6c8 | 255 | sclp.has_linemode = 1; |
52733e01 HB |
256 | } |
257 | ||
7b50da53 MH |
258 | void __init sclp_early_detect(void) |
259 | { | |
d5ab7a34 | 260 | void *sccb = &sclp_early_sccb; |
5d5de1a0 | 261 | |
d5ab7a34 HC |
262 | sclp_early_facilities_detect(sccb); |
263 | sclp_early_init_core_info(sccb); | |
264 | sclp_early_hsa_size_detect(sccb); | |
52733e01 | 265 | |
d5ab7a34 HC |
266 | /* |
267 | * Turn off SCLP event notifications. Also save remote masks in the | |
52733e01 HB |
268 | * sccb. These are sufficient to detect sclp console capabilities. |
269 | */ | |
d5ab7a34 HC |
270 | sclp_early_set_event_mask(sccb, 0, 0); |
271 | sclp_early_console_detect(sccb); | |
7b50da53 | 272 | } |