Commit | Line | Data |
---|---|---|
e657d8fe MH |
1 | /* |
2 | * SCLP early driver | |
3 | * | |
4 | * Copyright IBM Corp. 2013 | |
5 | */ | |
6 | ||
7 | #define KMSG_COMPONENT "sclp_early" | |
8 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
9 | ||
a313bdc5 | 10 | #include <linux/errno.h> |
acf6a004 | 11 | #include <asm/ctl_reg.h> |
e657d8fe MH |
12 | #include <asm/sclp.h> |
13 | #include <asm/ipl.h> | |
14 | #include "sclp_sdias.h" | |
15 | #include "sclp.h" | |
16 | ||
acf6a004 MH |
17 | #define SCLP_CMDW_READ_SCP_INFO 0x00020001 |
18 | #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001 | |
19 | ||
20 | struct read_info_sccb { | |
21 | struct sccb_header header; /* 0-7 */ | |
22 | u16 rnmax; /* 8-9 */ | |
23 | u8 rnsize; /* 10 */ | |
10ad34bc | 24 | u8 _pad_11[16 - 11]; /* 11-15 */ |
cf813db0 | 25 | u16 ncpurl; /* 16-17 */ |
217a4406 | 26 | u16 cpuoff; /* 18-19 */ |
10ad34bc | 27 | u8 _pad_20[24 - 20]; /* 20-23 */ |
acf6a004 | 28 | u8 loadparm[8]; /* 24-31 */ |
10ad34bc MS |
29 | u8 _pad_32[42 - 32]; /* 32-41 */ |
30 | u8 fac42; /* 42 */ | |
31 | u8 fac43; /* 43 */ | |
32 | u8 _pad_44[48 - 44]; /* 44-47 */ | |
acf6a004 | 33 | u64 facilities; /* 48-55 */ |
10ad34bc MS |
34 | u8 _pad_56[66 - 56]; /* 56-65 */ |
35 | u8 fac66; /* 66 */ | |
36 | u8 _pad_67[76 - 67]; /* 67-83 */ | |
570126d3 | 37 | u32 ibc; /* 76-79 */ |
10ad34bc | 38 | u8 _pad80[84 - 80]; /* 80-83 */ |
acf6a004 MH |
39 | u8 fac84; /* 84 */ |
40 | u8 fac85; /* 85 */ | |
10ad34bc | 41 | u8 _pad_86[91 - 86]; /* 86-90 */ |
acf6a004 | 42 | u8 flags; /* 91 */ |
32e6b236 GH |
43 | u8 _pad_92[99 - 92]; /* 92-98 */ |
44 | u8 hamaxpow; /* 99 */ | |
acf6a004 MH |
45 | u32 rnsize2; /* 100-103 */ |
46 | u64 rnmax2; /* 104-111 */ | |
f7ba1d34 ED |
47 | u8 _pad_112[116 - 112]; /* 112-115 */ |
48 | u8 fac116; /* 116 */ | |
a0eb55e6 DH |
49 | u8 fac117; /* 117 */ |
50 | u8 _pad_118; /* 118 */ | |
f7ba1d34 | 51 | u8 fac119; /* 119 */ |
cf813db0 | 52 | u16 hcpua; /* 120-121 */ |
154fa27e AY |
53 | u8 _pad_122[124 - 122]; /* 122-123 */ |
54 | u32 hmfai; /* 124-127 */ | |
55 | u8 _pad_128[4096 - 128]; /* 128-4095 */ | |
acf6a004 MH |
56 | } __packed __aligned(PAGE_SIZE); |
57 | ||
56e57a84 | 58 | static char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE) __initdata; |
333cce91 | 59 | static struct sclp_ipl_info sclp_ipl_info; |
e657d8fe | 60 | |
37c5f6c8 DH |
61 | struct sclp_info sclp; |
62 | EXPORT_SYMBOL(sclp); | |
acf6a004 MH |
63 | |
64 | static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb) | |
65 | { | |
66 | int rc; | |
67 | ||
68 | __ctl_set_bit(0, 9); | |
69 | rc = sclp_service_call(cmd, sccb); | |
70 | if (rc) | |
71 | goto out; | |
72 | __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | | |
73 | PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT); | |
74 | local_irq_disable(); | |
75 | out: | |
76 | /* Contents of the sccb might have changed. */ | |
77 | barrier(); | |
78 | __ctl_clear_bit(0, 9); | |
79 | return rc; | |
80 | } | |
81 | ||
56e57a84 | 82 | static int __init sclp_read_info_early(struct read_info_sccb *sccb) |
acf6a004 | 83 | { |
333cce91 | 84 | int rc, i; |
acf6a004 MH |
85 | sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, |
86 | SCLP_CMDW_READ_SCP_INFO}; | |
87 | ||
acf6a004 MH |
88 | for (i = 0; i < ARRAY_SIZE(commands); i++) { |
89 | do { | |
90 | memset(sccb, 0, sizeof(*sccb)); | |
91 | sccb->header.length = sizeof(*sccb); | |
92 | sccb->header.function_code = 0x80; | |
93 | sccb->header.control_mask[2] = 0x80; | |
94 | rc = sclp_cmd_sync_early(commands[i], sccb); | |
95 | } while (rc == -EBUSY); | |
96 | ||
97 | if (rc) | |
98 | break; | |
333cce91 HB |
99 | if (sccb->header.response_code == 0x10) |
100 | return 0; | |
acf6a004 MH |
101 | if (sccb->header.response_code != 0x1f0) |
102 | break; | |
103 | } | |
333cce91 | 104 | return -EIO; |
acf6a004 MH |
105 | } |
106 | ||
5d5de1a0 | 107 | static void __init sclp_facilities_detect(struct read_info_sccb *sccb) |
acf6a004 | 108 | { |
d08d9430 | 109 | struct sclp_core_entry *cpue; |
217a4406 HC |
110 | u16 boot_cpu_address, cpu; |
111 | ||
56e57a84 | 112 | if (sclp_read_info_early(sccb)) |
acf6a004 MH |
113 | return; |
114 | ||
78335a30 | 115 | sclp.facilities = sccb->facilities; |
37c5f6c8 | 116 | sclp.has_sprp = !!(sccb->fac84 & 0x02); |
d08d9430 | 117 | sclp.has_core_type = !!(sccb->fac84 & 0x01); |
5236c751 | 118 | sclp.has_gsls = !!(sccb->fac85 & 0x80); |
4013ade3 | 119 | sclp.has_64bscao = !!(sccb->fac116 & 0x80); |
09be9cb9 | 120 | sclp.has_cmma = !!(sccb->fac116 & 0x40); |
f7ba1d34 | 121 | sclp.has_esca = !!(sccb->fac116 & 0x08); |
a0eb55e6 | 122 | sclp.has_pfmfi = !!(sccb->fac117 & 0x40); |
9c375490 | 123 | sclp.has_ibs = !!(sccb->fac117 & 0x20); |
f7ba1d34 | 124 | sclp.has_hvs = !!(sccb->fac119 & 0x80); |
acf6a004 MH |
125 | if (sccb->fac85 & 0x02) |
126 | S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; | |
37c5f6c8 DH |
127 | sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; |
128 | sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; | |
129 | sclp.rzm <<= 20; | |
130 | sclp.ibc = sccb->ibc; | |
333cce91 | 131 | |
32e6b236 GH |
132 | if (sccb->hamaxpow && sccb->hamaxpow < 64) |
133 | sclp.hamax = (1UL << sccb->hamaxpow) - 1; | |
134 | else | |
135 | sclp.hamax = U64_MAX; | |
136 | ||
cf813db0 HC |
137 | if (!sccb->hcpua) { |
138 | if (MACHINE_IS_VM) | |
d08d9430 | 139 | sclp.max_cores = 64; |
cf813db0 | 140 | else |
d08d9430 | 141 | sclp.max_cores = sccb->ncpurl; |
cf813db0 | 142 | } else { |
d08d9430 | 143 | sclp.max_cores = sccb->hcpua + 1; |
cf813db0 HC |
144 | } |
145 | ||
217a4406 HC |
146 | boot_cpu_address = stap(); |
147 | cpue = (void *)sccb + sccb->cpuoff; | |
148 | for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { | |
10ad34bc | 149 | if (boot_cpu_address != cpue->core_id) |
217a4406 | 150 | continue; |
37c5f6c8 DH |
151 | sclp.has_siif = cpue->siif; |
152 | sclp.has_sigpif = cpue->sigpif; | |
8dfd523f | 153 | sclp.has_sief2 = cpue->sief2; |
b9e28897 | 154 | sclp.has_gpere = cpue->gpere; |
72cd82b9 | 155 | sclp.has_ib = cpue->ib; |
4a5c3e08 | 156 | sclp.has_cei = cpue->cei; |
23861451 | 157 | sclp.has_skey = cpue->skey; |
217a4406 HC |
158 | break; |
159 | } | |
160 | ||
333cce91 HB |
161 | /* Save IPL information */ |
162 | sclp_ipl_info.is_valid = 1; | |
163 | if (sccb->flags & 0x2) | |
164 | sclp_ipl_info.has_dump = 1; | |
165 | memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); | |
10ad34bc | 166 | |
37c5f6c8 DH |
167 | sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; |
168 | sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; | |
37c5f6c8 | 169 | sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; |
154fa27e AY |
170 | |
171 | sclp.hmfai = sccb->hmfai; | |
acf6a004 MH |
172 | } |
173 | ||
acf6a004 MH |
174 | /* |
175 | * This function will be called after sclp_facilities_detect(), which gets | |
333cce91 HB |
176 | * called from early.c code. The sclp_facilities_detect() function retrieves |
177 | * and saves the IPL information. | |
acf6a004 MH |
178 | */ |
179 | void __init sclp_get_ipl_info(struct sclp_ipl_info *info) | |
180 | { | |
333cce91 | 181 | *info = sclp_ipl_info; |
acf6a004 MH |
182 | } |
183 | ||
e657d8fe MH |
184 | static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb) |
185 | { | |
186 | int rc; | |
187 | ||
188 | do { | |
189 | rc = sclp_cmd_sync_early(cmd, sccb); | |
190 | } while (rc == -EBUSY); | |
191 | ||
192 | if (rc) | |
193 | return -EIO; | |
194 | if (((struct sccb_header *) sccb)->response_code != 0x0020) | |
195 | return -EIO; | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static void __init sccb_init_eq_size(struct sdias_sccb *sccb) | |
200 | { | |
201 | memset(sccb, 0, sizeof(*sccb)); | |
202 | ||
203 | sccb->hdr.length = sizeof(*sccb); | |
204 | sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf); | |
205 | sccb->evbuf.hdr.type = EVTYP_SDIAS; | |
206 | sccb->evbuf.event_qual = SDIAS_EQ_SIZE; | |
207 | sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP; | |
208 | sccb->evbuf.event_id = 4712; | |
209 | sccb->evbuf.dbs = 1; | |
210 | } | |
211 | ||
5d5de1a0 HB |
212 | static int __init sclp_set_event_mask(struct init_sccb *sccb, |
213 | unsigned long receive_mask, | |
e657d8fe MH |
214 | unsigned long send_mask) |
215 | { | |
e657d8fe MH |
216 | memset(sccb, 0, sizeof(*sccb)); |
217 | sccb->header.length = sizeof(*sccb); | |
218 | sccb->mask_length = sizeof(sccb_mask_t); | |
219 | sccb->receive_mask = receive_mask; | |
220 | sccb->send_mask = send_mask; | |
221 | return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb); | |
222 | } | |
223 | ||
5d5de1a0 | 224 | static long __init sclp_hsa_size_init(struct sdias_sccb *sccb) |
e657d8fe | 225 | { |
e657d8fe MH |
226 | sccb_init_eq_size(sccb); |
227 | if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb)) | |
228 | return -EIO; | |
9499934f MH |
229 | if (sccb->evbuf.blk_cnt == 0) |
230 | return 0; | |
231 | return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; | |
e657d8fe MH |
232 | } |
233 | ||
5d5de1a0 | 234 | static long __init sclp_hsa_copy_wait(struct sccb_header *sccb) |
e657d8fe | 235 | { |
e657d8fe MH |
236 | memset(sccb, 0, PAGE_SIZE); |
237 | sccb->length = PAGE_SIZE; | |
238 | if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb)) | |
239 | return -EIO; | |
9499934f MH |
240 | if (((struct sdias_sccb *) sccb)->evbuf.blk_cnt == 0) |
241 | return 0; | |
e657d8fe MH |
242 | return (((struct sdias_sccb *) sccb)->evbuf.blk_cnt - 1) * PAGE_SIZE; |
243 | } | |
244 | ||
5d5de1a0 | 245 | static void __init sclp_hsa_size_detect(void *sccb) |
e657d8fe MH |
246 | { |
247 | long size; | |
248 | ||
249 | /* First try synchronous interface (LPAR) */ | |
5d5de1a0 | 250 | if (sclp_set_event_mask(sccb, 0, 0x40000010)) |
e657d8fe | 251 | return; |
5d5de1a0 | 252 | size = sclp_hsa_size_init(sccb); |
e657d8fe MH |
253 | if (size < 0) |
254 | return; | |
255 | if (size != 0) | |
256 | goto out; | |
257 | /* Then try asynchronous interface (z/VM) */ | |
5d5de1a0 | 258 | if (sclp_set_event_mask(sccb, 0x00000010, 0x40000010)) |
e657d8fe | 259 | return; |
5d5de1a0 | 260 | size = sclp_hsa_size_init(sccb); |
e657d8fe MH |
261 | if (size < 0) |
262 | return; | |
5d5de1a0 | 263 | size = sclp_hsa_copy_wait(sccb); |
e657d8fe MH |
264 | if (size < 0) |
265 | return; | |
266 | out: | |
37c5f6c8 | 267 | sclp.hsa_size = size; |
e657d8fe | 268 | } |
7b50da53 | 269 | |
52733e01 HB |
270 | static unsigned int __init sclp_con_check_linemode(struct init_sccb *sccb) |
271 | { | |
ea61a579 | 272 | if (!(sccb->sclp_send_mask & EVTYP_OPCMD_MASK)) |
52733e01 HB |
273 | return 0; |
274 | if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK))) | |
275 | return 0; | |
276 | return 1; | |
277 | } | |
278 | ||
279 | static void __init sclp_console_detect(struct init_sccb *sccb) | |
280 | { | |
281 | if (sccb->header.response_code != 0x20) | |
282 | return; | |
283 | ||
284 | if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) | |
37c5f6c8 | 285 | sclp.has_vt220 = 1; |
52733e01 HB |
286 | |
287 | if (sclp_con_check_linemode(sccb)) | |
37c5f6c8 | 288 | sclp.has_linemode = 1; |
52733e01 HB |
289 | } |
290 | ||
7b50da53 MH |
291 | void __init sclp_early_detect(void) |
292 | { | |
5d5de1a0 HB |
293 | void *sccb = &sccb_early; |
294 | ||
295 | sclp_facilities_detect(sccb); | |
296 | sclp_hsa_size_detect(sccb); | |
52733e01 HB |
297 | |
298 | /* Turn off SCLP event notifications. Also save remote masks in the | |
299 | * sccb. These are sufficient to detect sclp console capabilities. | |
300 | */ | |
5d5de1a0 | 301 | sclp_set_event_mask(sccb, 0, 0); |
52733e01 | 302 | sclp_console_detect(sccb); |
7b50da53 | 303 | } |