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 */
50 u8 _pad_118; /* 118 */
52 u16 hcpua; /* 120-121 */
53 u8 _pad_122[124 - 122]; /* 122-123 */
54 u32 hmfai; /* 124-127 */
55 u8 _pad_128[4096 - 128]; /* 128-4095 */
56 } __packed __aligned(PAGE_SIZE);
58 static char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE) __initdata;
59 static struct sclp_ipl_info sclp_ipl_info;
61 struct sclp_info sclp;
64 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
69 rc = sclp_service_call(cmd, sccb);
72 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
73 PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
76 /* Contents of the sccb might have changed. */
78 __ctl_clear_bit(0, 9);
82 static int __init sclp_read_info_early(struct read_info_sccb *sccb)
85 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
86 SCLP_CMDW_READ_SCP_INFO};
88 for (i = 0; i < ARRAY_SIZE(commands); i++) {
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);
99 if (sccb->header.response_code == 0x10)
101 if (sccb->header.response_code != 0x1f0)
107 static void __init sclp_facilities_detect(struct read_info_sccb *sccb)
109 struct sclp_core_entry *cpue;
110 u16 boot_cpu_address, cpu;
112 if (sclp_read_info_early(sccb))
115 sclp.facilities = sccb->facilities;
116 sclp.has_sprp = !!(sccb->fac84 & 0x02);
117 sclp.has_core_type = !!(sccb->fac84 & 0x01);
118 sclp.has_gsls = !!(sccb->fac85 & 0x80);
119 sclp.has_64bscao = !!(sccb->fac116 & 0x80);
120 sclp.has_cmma = !!(sccb->fac116 & 0x40);
121 sclp.has_esca = !!(sccb->fac116 & 0x08);
122 sclp.has_pfmfi = !!(sccb->fac117 & 0x40);
123 sclp.has_ibs = !!(sccb->fac117 & 0x20);
124 sclp.has_hvs = !!(sccb->fac119 & 0x80);
125 if (sccb->fac85 & 0x02)
126 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
127 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
128 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
130 sclp.ibc = sccb->ibc;
132 if (sccb->hamaxpow && sccb->hamaxpow < 64)
133 sclp.hamax = (1UL << sccb->hamaxpow) - 1;
135 sclp.hamax = U64_MAX;
141 sclp.max_cores = sccb->ncpurl;
143 sclp.max_cores = sccb->hcpua + 1;
146 boot_cpu_address = stap();
147 cpue = (void *)sccb + sccb->cpuoff;
148 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
149 if (boot_cpu_address != cpue->core_id)
151 sclp.has_siif = cpue->siif;
152 sclp.has_sigpif = cpue->sigpif;
153 sclp.has_sief2 = cpue->sief2;
154 sclp.has_gpere = cpue->gpere;
155 sclp.has_ib = cpue->ib;
156 sclp.has_cei = cpue->cei;
157 sclp.has_skey = cpue->skey;
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);
167 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
168 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
169 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
171 sclp.hmfai = sccb->hmfai;
175 * This function will be called after sclp_facilities_detect(), which gets
176 * called from early.c code. The sclp_facilities_detect() function retrieves
177 * and saves the IPL information.
179 void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
181 *info = sclp_ipl_info;
184 static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb)
189 rc = sclp_cmd_sync_early(cmd, sccb);
190 } while (rc == -EBUSY);
194 if (((struct sccb_header *) sccb)->response_code != 0x0020)
199 static void __init sccb_init_eq_size(struct sdias_sccb *sccb)
201 memset(sccb, 0, sizeof(*sccb));
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;
212 static int __init sclp_set_event_mask(struct init_sccb *sccb,
213 unsigned long receive_mask,
214 unsigned long send_mask)
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);
224 static long __init sclp_hsa_size_init(struct sdias_sccb *sccb)
226 sccb_init_eq_size(sccb);
227 if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb))
229 if (sccb->evbuf.blk_cnt == 0)
231 return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
234 static long __init sclp_hsa_copy_wait(struct sccb_header *sccb)
236 memset(sccb, 0, PAGE_SIZE);
237 sccb->length = PAGE_SIZE;
238 if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb))
240 if (((struct sdias_sccb *) sccb)->evbuf.blk_cnt == 0)
242 return (((struct sdias_sccb *) sccb)->evbuf.blk_cnt - 1) * PAGE_SIZE;
245 static void __init sclp_hsa_size_detect(void *sccb)
249 /* First try synchronous interface (LPAR) */
250 if (sclp_set_event_mask(sccb, 0, 0x40000010))
252 size = sclp_hsa_size_init(sccb);
257 /* Then try asynchronous interface (z/VM) */
258 if (sclp_set_event_mask(sccb, 0x00000010, 0x40000010))
260 size = sclp_hsa_size_init(sccb);
263 size = sclp_hsa_copy_wait(sccb);
267 sclp.hsa_size = size;
270 static unsigned int __init sclp_con_check_linemode(struct init_sccb *sccb)
272 if (!(sccb->sclp_send_mask & EVTYP_OPCMD_MASK))
274 if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK)))
279 static void __init sclp_console_detect(struct init_sccb *sccb)
281 if (sccb->header.response_code != 0x20)
284 if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK)
287 if (sclp_con_check_linemode(sccb))
288 sclp.has_linemode = 1;
291 void __init sclp_early_detect(void)
293 void *sccb = &sccb_early;
295 sclp_facilities_detect(sccb);
296 sclp_hsa_size_detect(sccb);
298 /* Turn off SCLP event notifications. Also save remote masks in the
299 * sccb. These are sufficient to detect sclp console capabilities.
301 sclp_set_event_mask(sccb, 0, 0);
302 sclp_console_detect(sccb);