1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright IBM Corp. 2013
8 #define KMSG_COMPONENT "sclp_early"
9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11 #include <linux/errno.h>
12 #include <asm/ctl_reg.h>
15 #include "sclp_sdias.h"
18 #define SCLP_CMDW_READ_SCP_INFO 0x00020001
19 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
21 struct read_info_sccb
{
22 struct sccb_header header
; /* 0-7 */
25 u8 _pad_11
[16 - 11]; /* 11-15 */
26 u16 ncpurl
; /* 16-17 */
27 u16 cpuoff
; /* 18-19 */
28 u8 _pad_20
[24 - 20]; /* 20-23 */
29 u8 loadparm
[8]; /* 24-31 */
30 u8 _pad_32
[42 - 32]; /* 32-41 */
33 u8 _pad_44
[48 - 44]; /* 44-47 */
34 u64 facilities
; /* 48-55 */
35 u8 _pad_56
[66 - 56]; /* 56-65 */
37 u8 _pad_67
[76 - 67]; /* 67-83 */
39 u8 _pad80
[84 - 80]; /* 80-83 */
42 u8 _pad_86
[91 - 86]; /* 86-90 */
44 u8 _pad_92
[98 - 92]; /* 92-97 */
47 u32 rnsize2
; /* 100-103 */
48 u64 rnmax2
; /* 104-111 */
49 u8 _pad_112
[116 - 112]; /* 112-115 */
52 u8 _pad_118
; /* 118 */
54 u16 hcpua
; /* 120-121 */
55 u8 _pad_122
[124 - 122]; /* 122-123 */
56 u32 hmfai
; /* 124-127 */
57 u8 _pad_128
[4096 - 128]; /* 128-4095 */
58 } __packed
__aligned(PAGE_SIZE
);
60 static struct sclp_ipl_info sclp_ipl_info
;
62 struct sclp_info sclp
;
65 static int __init
sclp_early_read_info(struct read_info_sccb
*sccb
)
68 sclp_cmdw_t commands
[] = {SCLP_CMDW_READ_SCP_INFO_FORCED
,
69 SCLP_CMDW_READ_SCP_INFO
};
71 for (i
= 0; i
< ARRAY_SIZE(commands
); i
++) {
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
))
78 if (sccb
->header
.response_code
== 0x10)
80 if (sccb
->header
.response_code
!= 0x1f0)
86 static void __init
sclp_early_facilities_detect(struct read_info_sccb
*sccb
)
88 struct sclp_core_entry
*cpue
;
89 u16 boot_cpu_address
, cpu
;
91 if (sclp_early_read_info(sccb
))
94 sclp
.facilities
= sccb
->facilities
;
95 sclp
.has_sprp
= !!(sccb
->fac84
& 0x02);
96 sclp
.has_core_type
= !!(sccb
->fac84
& 0x01);
97 sclp
.has_gsls
= !!(sccb
->fac85
& 0x80);
98 sclp
.has_64bscao
= !!(sccb
->fac116
& 0x80);
99 sclp
.has_cmma
= !!(sccb
->fac116
& 0x40);
100 sclp
.has_esca
= !!(sccb
->fac116
& 0x08);
101 sclp
.has_pfmfi
= !!(sccb
->fac117
& 0x40);
102 sclp
.has_ibs
= !!(sccb
->fac117
& 0x20);
103 sclp
.has_hvs
= !!(sccb
->fac119
& 0x80);
104 sclp
.has_kss
= !!(sccb
->fac98
& 0x01);
105 if (sccb
->fac85
& 0x02)
106 S390_lowcore
.machine_flags
|= MACHINE_FLAG_ESOP
;
107 if (sccb
->fac91
& 0x40)
108 S390_lowcore
.machine_flags
|= MACHINE_FLAG_TLB_GUEST
;
109 sclp
.rnmax
= sccb
->rnmax
? sccb
->rnmax
: sccb
->rnmax2
;
110 sclp
.rzm
= sccb
->rnsize
? sccb
->rnsize
: sccb
->rnsize2
;
112 sclp
.ibc
= sccb
->ibc
;
114 if (sccb
->hamaxpow
&& sccb
->hamaxpow
< 64)
115 sclp
.hamax
= (1UL << sccb
->hamaxpow
) - 1;
117 sclp
.hamax
= U64_MAX
;
123 sclp
.max_cores
= sccb
->ncpurl
;
125 sclp
.max_cores
= sccb
->hcpua
+ 1;
128 boot_cpu_address
= stap();
129 cpue
= (void *)sccb
+ sccb
->cpuoff
;
130 for (cpu
= 0; cpu
< sccb
->ncpurl
; cpue
++, cpu
++) {
131 if (boot_cpu_address
!= cpue
->core_id
)
133 sclp
.has_siif
= cpue
->siif
;
134 sclp
.has_sigpif
= cpue
->sigpif
;
135 sclp
.has_sief2
= cpue
->sief2
;
136 sclp
.has_gpere
= cpue
->gpere
;
137 sclp
.has_ib
= cpue
->ib
;
138 sclp
.has_cei
= cpue
->cei
;
139 sclp
.has_skey
= cpue
->skey
;
143 /* Save IPL information */
144 sclp_ipl_info
.is_valid
= 1;
145 if (sccb
->fac91
& 0x2)
146 sclp_ipl_info
.has_dump
= 1;
147 memcpy(&sclp_ipl_info
.loadparm
, &sccb
->loadparm
, LOADPARM_LEN
);
149 sclp
.mtid
= (sccb
->fac42
& 0x80) ? (sccb
->fac42
& 31) : 0;
150 sclp
.mtid_cp
= (sccb
->fac42
& 0x80) ? (sccb
->fac43
& 31) : 0;
151 sclp
.mtid_prev
= (sccb
->fac42
& 0x80) ? (sccb
->fac66
& 31) : 0;
153 sclp
.hmfai
= sccb
->hmfai
;
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
159 * and saves the IPL information.
161 void __init
sclp_early_get_ipl_info(struct sclp_ipl_info
*info
)
163 *info
= sclp_ipl_info
;
166 static struct sclp_core_info sclp_early_core_info __initdata
;
167 static int sclp_early_core_info_valid __initdata
;
169 static void __init
sclp_early_init_core_info(struct read_cpu_info_sccb
*sccb
)
171 if (!SCLP_HAS_CPU_INFO
)
173 memset(sccb
, 0, sizeof(*sccb
));
174 sccb
->header
.length
= sizeof(*sccb
);
175 if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO
, sccb
))
177 if (sccb
->header
.response_code
!= 0x0010)
179 sclp_fill_core_info(&sclp_early_core_info
, sccb
);
180 sclp_early_core_info_valid
= 1;
183 int __init
sclp_early_get_core_info(struct sclp_core_info
*info
)
185 if (!sclp_early_core_info_valid
)
187 *info
= sclp_early_core_info
;
191 static long __init
sclp_early_hsa_size_init(struct sdias_sccb
*sccb
)
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;
201 if (sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_DATA
, sccb
))
203 if (sccb
->hdr
.response_code
!= 0x20)
205 if (sccb
->evbuf
.blk_cnt
== 0)
207 return (sccb
->evbuf
.blk_cnt
- 1) * PAGE_SIZE
;
210 static long __init
sclp_early_hsa_copy_wait(struct sdias_sccb
*sccb
)
212 memset(sccb
, 0, PAGE_SIZE
);
213 sccb
->hdr
.length
= PAGE_SIZE
;
214 if (sclp_early_cmd(SCLP_CMDW_READ_EVENT_DATA
, sccb
))
216 if ((sccb
->hdr
.response_code
!= 0x20) && (sccb
->hdr
.response_code
!= 0x220))
218 if (sccb
->evbuf
.blk_cnt
== 0)
220 return (sccb
->evbuf
.blk_cnt
- 1) * PAGE_SIZE
;
223 static void __init
sclp_early_hsa_size_detect(void *sccb
)
228 raw_local_irq_save(flags
);
229 if (sclp_early_set_event_mask(sccb
, EVTYP_SDIAS_MASK
, EVTYP_SDIAS_MASK
))
231 size
= sclp_early_hsa_size_init(sccb
);
232 /* First check for synchronous response (LPAR) */
235 if (!(S390_lowcore
.ext_params
& 1))
236 sclp_early_wait_irq();
237 size
= sclp_early_hsa_copy_wait(sccb
);
239 sclp_early_set_event_mask(sccb
, 0, 0);
241 raw_local_irq_restore(flags
);
243 sclp
.hsa_size
= size
;
246 static void __init
sclp_early_console_detect(struct init_sccb
*sccb
)
248 if (sccb
->header
.response_code
!= 0x20)
251 if (sccb
->sclp_send_mask
& EVTYP_VT220MSG_MASK
)
254 if (sclp_early_con_check_linemode(sccb
))
255 sclp
.has_linemode
= 1;
258 void __init
sclp_early_detect(void)
260 void *sccb
= &sclp_early_sccb
;
262 sclp_early_facilities_detect(sccb
);
263 sclp_early_init_core_info(sccb
);
264 sclp_early_hsa_size_detect(sccb
);
267 * Turn off SCLP event notifications. Also save remote masks in the
268 * sccb. These are sufficient to detect sclp console capabilities.
270 sclp_early_set_event_mask(sccb
, 0, 0);
271 sclp_early_console_detect(sccb
);