4 * Copyright IBM Corp. 2013
7 #define KMSG_COMPONENT "sclp_early"
8 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10 #include <asm/ctl_reg.h>
13 #include "sclp_sdias.h"
16 #define SCLP_CMDW_READ_SCP_INFO 0x00020001
17 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
19 struct read_info_sccb {
20 struct sccb_header header; /* 0-7 */
23 u8 _reserved0[16 - 11]; /* 11-15 */
24 u16 ncpurl; /* 16-17 */
25 u8 _reserved7[24 - 18]; /* 18-23 */
26 u8 loadparm[8]; /* 24-31 */
27 u8 _reserved1[48 - 32]; /* 32-47 */
28 u64 facilities; /* 48-55 */
29 u8 _reserved2[84 - 56]; /* 56-83 */
32 u8 _reserved3[91 - 86]; /* 86-90 */
34 u8 _reserved4[100 - 92]; /* 92-99 */
35 u32 rnsize2; /* 100-103 */
36 u64 rnmax2; /* 104-111 */
37 u8 _reserved5[120 - 112]; /* 112-119 */
38 u16 hcpua; /* 120-121 */
39 u8 _reserved6[4096 - 122]; /* 122-4095 */
40 } __packed __aligned(PAGE_SIZE);
42 static char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE) __initdata;
43 static unsigned int sclp_con_has_vt220 __initdata;
44 static unsigned int sclp_con_has_linemode __initdata;
45 static unsigned long sclp_hsa_size;
46 static unsigned int sclp_max_cpu;
47 static struct sclp_ipl_info sclp_ipl_info;
51 unsigned long long sclp_rzm;
52 unsigned long long sclp_rnmax;
54 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
59 rc = sclp_service_call(cmd, sccb);
62 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
63 PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
66 /* Contents of the sccb might have changed. */
68 __ctl_clear_bit(0, 9);
72 static int __init sclp_read_info_early(struct read_info_sccb *sccb)
75 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
76 SCLP_CMDW_READ_SCP_INFO};
78 for (i = 0; i < ARRAY_SIZE(commands); i++) {
80 memset(sccb, 0, sizeof(*sccb));
81 sccb->header.length = sizeof(*sccb);
82 sccb->header.function_code = 0x80;
83 sccb->header.control_mask[2] = 0x80;
84 rc = sclp_cmd_sync_early(commands[i], sccb);
85 } while (rc == -EBUSY);
89 if (sccb->header.response_code == 0x10)
91 if (sccb->header.response_code != 0x1f0)
97 static void __init sclp_facilities_detect(struct read_info_sccb *sccb)
99 if (sclp_read_info_early(sccb))
102 sclp_facilities = sccb->facilities;
103 sclp_fac84 = sccb->fac84;
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;
114 sclp_max_cpu = sccb->ncpurl;
116 sclp_max_cpu = sccb->hcpua + 1;
119 /* Save IPL information */
120 sclp_ipl_info.is_valid = 1;
121 if (sccb->flags & 0x2)
122 sclp_ipl_info.has_dump = 1;
123 memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
126 bool __init sclp_has_linemode(void)
128 return !!sclp_con_has_linemode;
131 bool __init sclp_has_vt220(void)
133 return !!sclp_con_has_vt220;
136 unsigned long long sclp_get_rnmax(void)
141 unsigned long long sclp_get_rzm(void)
146 unsigned int sclp_get_max_cpu(void)
152 * This function will be called after sclp_facilities_detect(), which gets
153 * called from early.c code. The sclp_facilities_detect() function retrieves
154 * and saves the IPL information.
156 void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
158 *info = sclp_ipl_info;
161 static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb)
166 rc = sclp_cmd_sync_early(cmd, sccb);
167 } while (rc == -EBUSY);
171 if (((struct sccb_header *) sccb)->response_code != 0x0020)
176 static void __init sccb_init_eq_size(struct sdias_sccb *sccb)
178 memset(sccb, 0, sizeof(*sccb));
180 sccb->hdr.length = sizeof(*sccb);
181 sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf);
182 sccb->evbuf.hdr.type = EVTYP_SDIAS;
183 sccb->evbuf.event_qual = SDIAS_EQ_SIZE;
184 sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP;
185 sccb->evbuf.event_id = 4712;
189 static int __init sclp_set_event_mask(struct init_sccb *sccb,
190 unsigned long receive_mask,
191 unsigned long send_mask)
193 memset(sccb, 0, sizeof(*sccb));
194 sccb->header.length = sizeof(*sccb);
195 sccb->mask_length = sizeof(sccb_mask_t);
196 sccb->receive_mask = receive_mask;
197 sccb->send_mask = send_mask;
198 return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb);
201 static long __init sclp_hsa_size_init(struct sdias_sccb *sccb)
203 sccb_init_eq_size(sccb);
204 if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb))
206 if (sccb->evbuf.blk_cnt == 0)
208 return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
211 static long __init sclp_hsa_copy_wait(struct sccb_header *sccb)
213 memset(sccb, 0, PAGE_SIZE);
214 sccb->length = PAGE_SIZE;
215 if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb))
217 if (((struct sdias_sccb *) sccb)->evbuf.blk_cnt == 0)
219 return (((struct sdias_sccb *) sccb)->evbuf.blk_cnt - 1) * PAGE_SIZE;
222 unsigned long sclp_get_hsa_size(void)
224 return sclp_hsa_size;
227 static void __init sclp_hsa_size_detect(void *sccb)
231 /* First try synchronous interface (LPAR) */
232 if (sclp_set_event_mask(sccb, 0, 0x40000010))
234 size = sclp_hsa_size_init(sccb);
239 /* Then try asynchronous interface (z/VM) */
240 if (sclp_set_event_mask(sccb, 0x00000010, 0x40000010))
242 size = sclp_hsa_size_init(sccb);
245 size = sclp_hsa_copy_wait(sccb);
249 sclp_hsa_size = size;
252 static unsigned int __init sclp_con_check_linemode(struct init_sccb *sccb)
254 if (!(sccb->sclp_send_mask & (EVTYP_OPCMD_MASK | EVTYP_PMSGCMD_MASK)))
256 if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK)))
261 static void __init sclp_console_detect(struct init_sccb *sccb)
263 if (sccb->header.response_code != 0x20)
266 if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK)
267 sclp_con_has_vt220 = 1;
269 if (sclp_con_check_linemode(sccb))
270 sclp_con_has_linemode = 1;
273 void __init sclp_early_detect(void)
275 void *sccb = &sccb_early;
277 sclp_facilities_detect(sccb);
278 sclp_hsa_size_detect(sccb);
280 /* Turn off SCLP event notifications. Also save remote masks in the
281 * sccb. These are sufficient to detect sclp console capabilities.
283 sclp_set_event_mask(sccb, 0, 0);
284 sclp_console_detect(sccb);