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