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[98 - 92]; /* 92-97 */
46 u32 rnsize2; /* 100-103 */
47 u64 rnmax2; /* 104-111 */
48 u8 _pad_112[116 - 112]; /* 112-115 */
51 u8 _pad_118; /* 118 */
53 u16 hcpua; /* 120-121 */
54 u8 _pad_122[124 - 122]; /* 122-123 */
55 u32 hmfai; /* 124-127 */
56 u8 _pad_128[4096 - 128]; /* 128-4095 */
57 } __packed __aligned(PAGE_SIZE);
59 static struct sclp_ipl_info sclp_ipl_info;
61 struct sclp_info sclp;
64 static int __init sclp_early_read_info(struct read_info_sccb *sccb)
67 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
68 SCLP_CMDW_READ_SCP_INFO};
70 for (i = 0; i < ARRAY_SIZE(commands); i++) {
71 memset(sccb, 0, sizeof(*sccb));
72 sccb->header.length = sizeof(*sccb);
73 sccb->header.function_code = 0x80;
74 sccb->header.control_mask[2] = 0x80;
75 if (sclp_early_cmd(commands[i], sccb))
77 if (sccb->header.response_code == 0x10)
79 if (sccb->header.response_code != 0x1f0)
85 static void __init sclp_early_facilities_detect(struct read_info_sccb *sccb)
87 struct sclp_core_entry *cpue;
88 u16 boot_cpu_address, cpu;
90 if (sclp_early_read_info(sccb))
93 sclp.facilities = sccb->facilities;
94 sclp.has_sprp = !!(sccb->fac84 & 0x02);
95 sclp.has_core_type = !!(sccb->fac84 & 0x01);
96 sclp.has_gsls = !!(sccb->fac85 & 0x80);
97 sclp.has_64bscao = !!(sccb->fac116 & 0x80);
98 sclp.has_cmma = !!(sccb->fac116 & 0x40);
99 sclp.has_esca = !!(sccb->fac116 & 0x08);
100 sclp.has_pfmfi = !!(sccb->fac117 & 0x40);
101 sclp.has_ibs = !!(sccb->fac117 & 0x20);
102 sclp.has_hvs = !!(sccb->fac119 & 0x80);
103 sclp.has_kss = !!(sccb->fac98 & 0x01);
104 if (sccb->fac85 & 0x02)
105 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
106 sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
107 sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
109 sclp.ibc = sccb->ibc;
111 if (sccb->hamaxpow && sccb->hamaxpow < 64)
112 sclp.hamax = (1UL << sccb->hamaxpow) - 1;
114 sclp.hamax = U64_MAX;
120 sclp.max_cores = sccb->ncpurl;
122 sclp.max_cores = sccb->hcpua + 1;
125 boot_cpu_address = stap();
126 cpue = (void *)sccb + sccb->cpuoff;
127 for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
128 if (boot_cpu_address != cpue->core_id)
130 sclp.has_siif = cpue->siif;
131 sclp.has_sigpif = cpue->sigpif;
132 sclp.has_sief2 = cpue->sief2;
133 sclp.has_gpere = cpue->gpere;
134 sclp.has_ib = cpue->ib;
135 sclp.has_cei = cpue->cei;
136 sclp.has_skey = cpue->skey;
140 /* Save IPL information */
141 sclp_ipl_info.is_valid = 1;
142 if (sccb->flags & 0x2)
143 sclp_ipl_info.has_dump = 1;
144 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
146 sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
147 sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
148 sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
150 sclp.hmfai = sccb->hmfai;
154 * This function will be called after sclp_early_facilities_detect(), which gets
155 * called from early.c code. The sclp_early_facilities_detect() function retrieves
156 * and saves the IPL information.
158 void __init sclp_early_get_ipl_info(struct sclp_ipl_info *info)
160 *info = sclp_ipl_info;
163 static struct sclp_core_info sclp_early_core_info __initdata;
164 static int sclp_early_core_info_valid __initdata;
166 static void __init sclp_early_init_core_info(struct read_cpu_info_sccb *sccb)
168 if (!SCLP_HAS_CPU_INFO)
170 memset(sccb, 0, sizeof(*sccb));
171 sccb->header.length = sizeof(*sccb);
172 if (sclp_early_cmd(SCLP_CMDW_READ_CPU_INFO, sccb))
174 if (sccb->header.response_code != 0x0010)
176 sclp_fill_core_info(&sclp_early_core_info, sccb);
177 sclp_early_core_info_valid = 1;
180 int __init sclp_early_get_core_info(struct sclp_core_info *info)
182 if (!sclp_early_core_info_valid)
184 *info = sclp_early_core_info;
188 static long __init sclp_early_hsa_size_init(struct sdias_sccb *sccb)
190 memset(sccb, 0, sizeof(*sccb));
191 sccb->hdr.length = sizeof(*sccb);
192 sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf);
193 sccb->evbuf.hdr.type = EVTYP_SDIAS;
194 sccb->evbuf.event_qual = SDIAS_EQ_SIZE;
195 sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP;
196 sccb->evbuf.event_id = 4712;
198 if (sclp_early_cmd(SCLP_CMDW_WRITE_EVENT_DATA, sccb))
200 if (sccb->hdr.response_code != 0x20)
202 if (sccb->evbuf.blk_cnt == 0)
204 return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
207 static long __init sclp_early_hsa_copy_wait(struct sdias_sccb *sccb)
209 memset(sccb, 0, PAGE_SIZE);
210 sccb->hdr.length = PAGE_SIZE;
211 if (sclp_early_cmd(SCLP_CMDW_READ_EVENT_DATA, sccb))
213 if ((sccb->hdr.response_code != 0x20) && (sccb->hdr.response_code != 0x220))
215 if (sccb->evbuf.blk_cnt == 0)
217 return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
220 static void __init sclp_early_hsa_size_detect(void *sccb)
225 raw_local_irq_save(flags);
226 if (sclp_early_set_event_mask(sccb, EVTYP_SDIAS_MASK, EVTYP_SDIAS_MASK))
228 size = sclp_early_hsa_size_init(sccb);
229 /* First check for synchronous response (LPAR) */
232 if (!(S390_lowcore.ext_params & 1))
233 sclp_early_wait_irq();
234 size = sclp_early_hsa_copy_wait(sccb);
236 sclp_early_set_event_mask(sccb, 0, 0);
238 raw_local_irq_restore(flags);
240 sclp.hsa_size = size;
243 static void __init sclp_early_console_detect(struct init_sccb *sccb)
245 if (sccb->header.response_code != 0x20)
248 if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK)
251 if (sclp_early_con_check_linemode(sccb))
252 sclp.has_linemode = 1;
255 void __init sclp_early_detect(void)
257 void *sccb = &sclp_early_sccb;
259 sclp_early_facilities_detect(sccb);
260 sclp_early_init_core_info(sccb);
261 sclp_early_hsa_size_detect(sccb);
264 * Turn off SCLP event notifications. Also save remote masks in the
265 * sccb. These are sufficient to detect sclp console capabilities.
267 sclp_early_set_event_mask(sccb, 0, 0);
268 sclp_early_console_detect(sccb);