4 * Copyright IBM Corp. 2013
7 #define KMSG_COMPONENT "sclp_early"
8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10 #include <linux/errno.h>
11 #include <asm/ctl_reg.h>
14 #include "sclp_sdias.h"
17 #define SCLP_CMDW_READ_SCP_INFO 0x00020001
18 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
20 struct read_info_sccb {
21 struct sccb_header header; /* 0-7 */
24 u8 _pad_11[16 - 11]; /* 11-15 */
25 u16 ncpurl; /* 16-17 */
26 u16 cpuoff; /* 18-19 */
27 u8 _pad_20[24 - 20]; /* 20-23 */
28 u8 loadparm[8]; /* 24-31 */
29 u8 _pad_32[42 - 32]; /* 32-41 */
32 u8 _pad_44[48 - 44]; /* 44-47 */
33 u64 facilities; /* 48-55 */
34 u8 _pad_56[66 - 56]; /* 56-65 */
36 u8 _pad_67[76 - 67]; /* 67-83 */
38 u8 _pad80[84 - 80]; /* 80-83 */
41 u8 _pad_86[91 - 86]; /* 86-90 */
43 u8 _pad_92[99 - 92]; /* 92-98 */
45 u32 rnsize2; /* 100-103 */
46 u64 rnmax2; /* 104-111 */
47 u8 _pad_112[116 - 112]; /* 112-115 */
49 u8 _pad_117[119 - 117]; /* 117-118 */
51 u16 hcpua; /* 120-121 */
52 u8 _pad_122[124 - 122]; /* 122-123 */
53 u32 hmfai; /* 124-127 */
54 u8 _pad_128[4096 - 128]; /* 128-4095 */
55 } __packed __aligned(PAGE_SIZE);
57 static char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE) __initdata;
58 static struct sclp_ipl_info sclp_ipl_info;
60 struct sclp_info sclp;
63 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
68 rc = sclp_service_call(cmd, sccb);
71 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
72 PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
75 /* Contents of the sccb might have changed. */
77 __ctl_clear_bit(0, 9);
81 static int __init sclp_read_info_early(struct read_info_sccb *sccb)
84 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
85 SCLP_CMDW_READ_SCP_INFO};
87 for (i = 0; i < ARRAY_SIZE(commands); i++) {
89 memset(sccb, 0, sizeof(*sccb));
90 sccb->header.length = sizeof(*sccb);
91 sccb->header.function_code = 0x80;
92 sccb->header.control_mask[2] = 0x80;
93 rc = sclp_cmd_sync_early(commands[i], sccb);
94 } while (rc == -EBUSY);
98 if (sccb->header.response_code == 0x10)
100 if (sccb->header.response_code != 0x1f0)
106 static void __init sclp_facilities_detect(struct read_info_sccb *sccb)
108 struct sclp_core_entry *cpue;
109 u16 boot_cpu_address, cpu;
111 if (sclp_read_info_early(sccb))
114 sclp.facilities = sccb->facilities;
115 sclp.has_sprp = !!(sccb->fac84 & 0x02);
116 sclp.has_core_type = !!(sccb->fac84 & 0x01);
117 sclp.has_gsls = !!(sccb->fac85 & 0x80);
118 sclp.has_64bscao = !!(sccb->fac116 & 0x80);
119 sclp.has_cmma = !!(sccb->fac116 & 0x40);
120 sclp.has_esca = !!(sccb->fac116 & 0x08);
121 sclp.has_hvs = !!(sccb->fac119 & 0x80);
122 if (sccb->fac85 & 0x02)
123 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
124 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
125 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
127 sclp.ibc = sccb->ibc;
129 if (sccb->hamaxpow && sccb->hamaxpow < 64)
130 sclp.hamax = (1UL << sccb->hamaxpow) - 1;
132 sclp.hamax = U64_MAX;
138 sclp.max_cores = sccb->ncpurl;
140 sclp.max_cores = sccb->hcpua + 1;
143 boot_cpu_address = stap();
144 cpue = (void *)sccb + sccb->cpuoff;
145 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
146 if (boot_cpu_address != cpue->core_id)
148 sclp.has_siif = cpue->siif;
149 sclp.has_sigpif = cpue->sigpif;
150 sclp.has_sief2 = cpue->sief2;
151 sclp.has_gpere = cpue->gpere;
152 sclp.has_ib = cpue->ib;
156 /* Save IPL information */
157 sclp_ipl_info.is_valid = 1;
158 if (sccb->flags & 0x2)
159 sclp_ipl_info.has_dump = 1;
160 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
162 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
163 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
164 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
166 sclp.hmfai = sccb->hmfai;
170 * This function will be called after sclp_facilities_detect(), which gets
171 * called from early.c code. The sclp_facilities_detect() function retrieves
172 * and saves the IPL information.
174 void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
176 *info = sclp_ipl_info;
179 static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb)
184 rc = sclp_cmd_sync_early(cmd, sccb);
185 } while (rc == -EBUSY);
189 if (((struct sccb_header *) sccb)->response_code != 0x0020)
194 static void __init sccb_init_eq_size(struct sdias_sccb *sccb)
196 memset(sccb, 0, sizeof(*sccb));
198 sccb->hdr.length = sizeof(*sccb);
199 sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf);
200 sccb->evbuf.hdr.type = EVTYP_SDIAS;
201 sccb->evbuf.event_qual = SDIAS_EQ_SIZE;
202 sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP;
203 sccb->evbuf.event_id = 4712;
207 static int __init sclp_set_event_mask(struct init_sccb *sccb,
208 unsigned long receive_mask,
209 unsigned long send_mask)
211 memset(sccb, 0, sizeof(*sccb));
212 sccb->header.length = sizeof(*sccb);
213 sccb->mask_length = sizeof(sccb_mask_t);
214 sccb->receive_mask = receive_mask;
215 sccb->send_mask = send_mask;
216 return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb);
219 static long __init sclp_hsa_size_init(struct sdias_sccb *sccb)
221 sccb_init_eq_size(sccb);
222 if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb))
224 if (sccb->evbuf.blk_cnt == 0)
226 return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
229 static long __init sclp_hsa_copy_wait(struct sccb_header *sccb)
231 memset(sccb, 0, PAGE_SIZE);
232 sccb->length = PAGE_SIZE;
233 if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb))
235 if (((struct sdias_sccb *) sccb)->evbuf.blk_cnt == 0)
237 return (((struct sdias_sccb *) sccb)->evbuf.blk_cnt - 1) * PAGE_SIZE;
240 static void __init sclp_hsa_size_detect(void *sccb)
244 /* First try synchronous interface (LPAR) */
245 if (sclp_set_event_mask(sccb, 0, 0x40000010))
247 size = sclp_hsa_size_init(sccb);
252 /* Then try asynchronous interface (z/VM) */
253 if (sclp_set_event_mask(sccb, 0x00000010, 0x40000010))
255 size = sclp_hsa_size_init(sccb);
258 size = sclp_hsa_copy_wait(sccb);
262 sclp.hsa_size = size;
265 static unsigned int __init sclp_con_check_linemode(struct init_sccb *sccb)
267 if (!(sccb->sclp_send_mask & EVTYP_OPCMD_MASK))
269 if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK)))
274 static void __init sclp_console_detect(struct init_sccb *sccb)
276 if (sccb->header.response_code != 0x20)
279 if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK)
282 if (sclp_con_check_linemode(sccb))
283 sclp.has_linemode = 1;
286 void __init sclp_early_detect(void)
288 void *sccb = &sccb_early;
290 sclp_facilities_detect(sccb);
291 sclp_hsa_size_detect(sccb);
293 /* Turn off SCLP event notifications. Also save remote masks in the
294 * sccb. These are sufficient to detect sclp console capabilities.
296 sclp_set_event_mask(sccb, 0, 0);
297 sclp_console_detect(sccb);