]>
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 */ |
10ad34bc | 43 | u8 _pad_92[100 - 92]; /* 92-99 */ |
acf6a004 MH |
44 | u32 rnsize2; /* 100-103 */ |
45 | u64 rnmax2; /* 104-111 */ | |
10ad34bc | 46 | u8 _pad_112[120 - 112]; /* 112-119 */ |
cf813db0 | 47 | u16 hcpua; /* 120-121 */ |
10ad34bc | 48 | u8 _pad_122[4096 - 122]; /* 122-4095 */ |
acf6a004 MH |
49 | } __packed __aligned(PAGE_SIZE); |
50 | ||
56e57a84 | 51 | static char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE) __initdata; |
333cce91 | 52 | static struct sclp_ipl_info sclp_ipl_info; |
e657d8fe | 53 | |
37c5f6c8 DH |
54 | struct sclp_info sclp; |
55 | EXPORT_SYMBOL(sclp); | |
acf6a004 MH |
56 | |
57 | static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb) | |
58 | { | |
59 | int rc; | |
60 | ||
61 | __ctl_set_bit(0, 9); | |
62 | rc = sclp_service_call(cmd, sccb); | |
63 | if (rc) | |
64 | goto out; | |
65 | __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | | |
66 | PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT); | |
67 | local_irq_disable(); | |
68 | out: | |
69 | /* Contents of the sccb might have changed. */ | |
70 | barrier(); | |
71 | __ctl_clear_bit(0, 9); | |
72 | return rc; | |
73 | } | |
74 | ||
56e57a84 | 75 | static int __init sclp_read_info_early(struct read_info_sccb *sccb) |
acf6a004 | 76 | { |
333cce91 | 77 | int rc, i; |
acf6a004 MH |
78 | sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, |
79 | SCLP_CMDW_READ_SCP_INFO}; | |
80 | ||
acf6a004 MH |
81 | for (i = 0; i < ARRAY_SIZE(commands); i++) { |
82 | do { | |
83 | memset(sccb, 0, sizeof(*sccb)); | |
84 | sccb->header.length = sizeof(*sccb); | |
85 | sccb->header.function_code = 0x80; | |
86 | sccb->header.control_mask[2] = 0x80; | |
87 | rc = sclp_cmd_sync_early(commands[i], sccb); | |
88 | } while (rc == -EBUSY); | |
89 | ||
90 | if (rc) | |
91 | break; | |
333cce91 HB |
92 | if (sccb->header.response_code == 0x10) |
93 | return 0; | |
acf6a004 MH |
94 | if (sccb->header.response_code != 0x1f0) |
95 | break; | |
96 | } | |
333cce91 | 97 | return -EIO; |
acf6a004 MH |
98 | } |
99 | ||
5d5de1a0 | 100 | static void __init sclp_facilities_detect(struct read_info_sccb *sccb) |
acf6a004 | 101 | { |
d08d9430 | 102 | struct sclp_core_entry *cpue; |
217a4406 HC |
103 | u16 boot_cpu_address, cpu; |
104 | ||
56e57a84 | 105 | if (sclp_read_info_early(sccb)) |
acf6a004 MH |
106 | return; |
107 | ||
78335a30 | 108 | sclp.facilities = sccb->facilities; |
37c5f6c8 | 109 | sclp.has_sprp = !!(sccb->fac84 & 0x02); |
d08d9430 | 110 | sclp.has_core_type = !!(sccb->fac84 & 0x01); |
acf6a004 MH |
111 | if (sccb->fac85 & 0x02) |
112 | S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; | |
37c5f6c8 DH |
113 | sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; |
114 | sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; | |
115 | sclp.rzm <<= 20; | |
116 | sclp.ibc = sccb->ibc; | |
333cce91 | 117 | |
cf813db0 HC |
118 | if (!sccb->hcpua) { |
119 | if (MACHINE_IS_VM) | |
d08d9430 | 120 | sclp.max_cores = 64; |
cf813db0 | 121 | else |
d08d9430 | 122 | sclp.max_cores = sccb->ncpurl; |
cf813db0 | 123 | } else { |
d08d9430 | 124 | sclp.max_cores = sccb->hcpua + 1; |
cf813db0 HC |
125 | } |
126 | ||
217a4406 HC |
127 | boot_cpu_address = stap(); |
128 | cpue = (void *)sccb + sccb->cpuoff; | |
129 | for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) { | |
10ad34bc | 130 | if (boot_cpu_address != cpue->core_id) |
217a4406 | 131 | continue; |
37c5f6c8 DH |
132 | sclp.has_siif = cpue->siif; |
133 | sclp.has_sigpif = cpue->sigpif; | |
217a4406 HC |
134 | break; |
135 | } | |
136 | ||
333cce91 HB |
137 | /* Save IPL information */ |
138 | sclp_ipl_info.is_valid = 1; | |
139 | if (sccb->flags & 0x2) | |
140 | sclp_ipl_info.has_dump = 1; | |
141 | memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); | |
10ad34bc | 142 | |
37c5f6c8 DH |
143 | sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0; |
144 | sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0; | |
37c5f6c8 | 145 | sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0; |
acf6a004 MH |
146 | } |
147 | ||
acf6a004 MH |
148 | /* |
149 | * This function will be called after sclp_facilities_detect(), which gets | |
333cce91 HB |
150 | * called from early.c code. The sclp_facilities_detect() function retrieves |
151 | * and saves the IPL information. | |
acf6a004 MH |
152 | */ |
153 | void __init sclp_get_ipl_info(struct sclp_ipl_info *info) | |
154 | { | |
333cce91 | 155 | *info = sclp_ipl_info; |
acf6a004 MH |
156 | } |
157 | ||
e657d8fe MH |
158 | static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb) |
159 | { | |
160 | int rc; | |
161 | ||
162 | do { | |
163 | rc = sclp_cmd_sync_early(cmd, sccb); | |
164 | } while (rc == -EBUSY); | |
165 | ||
166 | if (rc) | |
167 | return -EIO; | |
168 | if (((struct sccb_header *) sccb)->response_code != 0x0020) | |
169 | return -EIO; | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static void __init sccb_init_eq_size(struct sdias_sccb *sccb) | |
174 | { | |
175 | memset(sccb, 0, sizeof(*sccb)); | |
176 | ||
177 | sccb->hdr.length = sizeof(*sccb); | |
178 | sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf); | |
179 | sccb->evbuf.hdr.type = EVTYP_SDIAS; | |
180 | sccb->evbuf.event_qual = SDIAS_EQ_SIZE; | |
181 | sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP; | |
182 | sccb->evbuf.event_id = 4712; | |
183 | sccb->evbuf.dbs = 1; | |
184 | } | |
185 | ||
5d5de1a0 HB |
186 | static int __init sclp_set_event_mask(struct init_sccb *sccb, |
187 | unsigned long receive_mask, | |
e657d8fe MH |
188 | unsigned long send_mask) |
189 | { | |
e657d8fe MH |
190 | memset(sccb, 0, sizeof(*sccb)); |
191 | sccb->header.length = sizeof(*sccb); | |
192 | sccb->mask_length = sizeof(sccb_mask_t); | |
193 | sccb->receive_mask = receive_mask; | |
194 | sccb->send_mask = send_mask; | |
195 | return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb); | |
196 | } | |
197 | ||
5d5de1a0 | 198 | static long __init sclp_hsa_size_init(struct sdias_sccb *sccb) |
e657d8fe | 199 | { |
e657d8fe MH |
200 | sccb_init_eq_size(sccb); |
201 | if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb)) | |
202 | return -EIO; | |
9499934f MH |
203 | if (sccb->evbuf.blk_cnt == 0) |
204 | return 0; | |
205 | return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; | |
e657d8fe MH |
206 | } |
207 | ||
5d5de1a0 | 208 | static long __init sclp_hsa_copy_wait(struct sccb_header *sccb) |
e657d8fe | 209 | { |
e657d8fe MH |
210 | memset(sccb, 0, PAGE_SIZE); |
211 | sccb->length = PAGE_SIZE; | |
212 | if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb)) | |
213 | return -EIO; | |
9499934f MH |
214 | if (((struct sdias_sccb *) sccb)->evbuf.blk_cnt == 0) |
215 | return 0; | |
e657d8fe MH |
216 | return (((struct sdias_sccb *) sccb)->evbuf.blk_cnt - 1) * PAGE_SIZE; |
217 | } | |
218 | ||
5d5de1a0 | 219 | static void __init sclp_hsa_size_detect(void *sccb) |
e657d8fe MH |
220 | { |
221 | long size; | |
222 | ||
223 | /* First try synchronous interface (LPAR) */ | |
5d5de1a0 | 224 | if (sclp_set_event_mask(sccb, 0, 0x40000010)) |
e657d8fe | 225 | return; |
5d5de1a0 | 226 | size = sclp_hsa_size_init(sccb); |
e657d8fe MH |
227 | if (size < 0) |
228 | return; | |
229 | if (size != 0) | |
230 | goto out; | |
231 | /* Then try asynchronous interface (z/VM) */ | |
5d5de1a0 | 232 | if (sclp_set_event_mask(sccb, 0x00000010, 0x40000010)) |
e657d8fe | 233 | return; |
5d5de1a0 | 234 | size = sclp_hsa_size_init(sccb); |
e657d8fe MH |
235 | if (size < 0) |
236 | return; | |
5d5de1a0 | 237 | size = sclp_hsa_copy_wait(sccb); |
e657d8fe MH |
238 | if (size < 0) |
239 | return; | |
240 | out: | |
37c5f6c8 | 241 | sclp.hsa_size = size; |
e657d8fe | 242 | } |
7b50da53 | 243 | |
52733e01 HB |
244 | static unsigned int __init sclp_con_check_linemode(struct init_sccb *sccb) |
245 | { | |
ea61a579 | 246 | if (!(sccb->sclp_send_mask & EVTYP_OPCMD_MASK)) |
52733e01 HB |
247 | return 0; |
248 | if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK))) | |
249 | return 0; | |
250 | return 1; | |
251 | } | |
252 | ||
253 | static void __init sclp_console_detect(struct init_sccb *sccb) | |
254 | { | |
255 | if (sccb->header.response_code != 0x20) | |
256 | return; | |
257 | ||
258 | if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) | |
37c5f6c8 | 259 | sclp.has_vt220 = 1; |
52733e01 HB |
260 | |
261 | if (sclp_con_check_linemode(sccb)) | |
37c5f6c8 | 262 | sclp.has_linemode = 1; |
52733e01 HB |
263 | } |
264 | ||
7b50da53 MH |
265 | void __init sclp_early_detect(void) |
266 | { | |
5d5de1a0 HB |
267 | void *sccb = &sccb_early; |
268 | ||
269 | sclp_facilities_detect(sccb); | |
270 | sclp_hsa_size_detect(sccb); | |
52733e01 HB |
271 | |
272 | /* Turn off SCLP event notifications. Also save remote masks in the | |
273 | * sccb. These are sufficient to detect sclp console capabilities. | |
274 | */ | |
5d5de1a0 | 275 | sclp_set_event_mask(sccb, 0, 0); |
52733e01 | 276 | sclp_console_detect(sccb); |
7b50da53 | 277 | } |