Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 1 | /* |
| 2 | * SCLP early driver |
| 3 | * |
| 4 | * Copyright IBM Corp. 2013 |
| 5 | */ |
| 6 | |
| 7 | #define KMSG_COMPONENT "sclp_early" |
| 8 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 9 | |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 10 | #include <asm/ctl_reg.h> |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 11 | #include <asm/sclp.h> |
| 12 | #include <asm/ipl.h> |
| 13 | #include "sclp_sdias.h" |
| 14 | #include "sclp.h" |
| 15 | |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 16 | #define SCLP_CMDW_READ_SCP_INFO 0x00020001 |
| 17 | #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001 |
| 18 | |
| 19 | struct read_info_sccb { |
| 20 | struct sccb_header header; /* 0-7 */ |
| 21 | u16 rnmax; /* 8-9 */ |
| 22 | u8 rnsize; /* 10 */ |
| 23 | u8 _reserved0[24 - 11]; /* 11-15 */ |
| 24 | u8 loadparm[8]; /* 24-31 */ |
| 25 | u8 _reserved1[48 - 32]; /* 32-47 */ |
| 26 | u64 facilities; /* 48-55 */ |
| 27 | u8 _reserved2[84 - 56]; /* 56-83 */ |
| 28 | u8 fac84; /* 84 */ |
| 29 | u8 fac85; /* 85 */ |
| 30 | u8 _reserved3[91 - 86]; /* 86-90 */ |
| 31 | u8 flags; /* 91 */ |
| 32 | u8 _reserved4[100 - 92]; /* 92-99 */ |
| 33 | u32 rnsize2; /* 100-103 */ |
| 34 | u64 rnmax2; /* 104-111 */ |
| 35 | u8 _reserved5[4096 - 112]; /* 112-4095 */ |
| 36 | } __packed __aligned(PAGE_SIZE); |
| 37 | |
Hendrik Brueckner | 56e57a8 | 2013-12-05 19:03:50 +0100 | [diff] [blame] | 38 | static char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE) __initdata; |
Hendrik Brueckner | 52733e0 | 2013-12-05 19:28:39 +0100 | [diff] [blame] | 39 | static unsigned int sclp_con_has_vt220 __initdata; |
| 40 | static unsigned int sclp_con_has_linemode __initdata; |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 41 | static unsigned long sclp_hsa_size; |
Hendrik Brueckner | 333cce9 | 2013-12-05 18:46:51 +0100 | [diff] [blame] | 42 | static struct sclp_ipl_info sclp_ipl_info; |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 43 | |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 44 | u64 sclp_facilities; |
| 45 | u8 sclp_fac84; |
| 46 | unsigned long long sclp_rzm; |
| 47 | unsigned long long sclp_rnmax; |
| 48 | |
| 49 | static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb) |
| 50 | { |
| 51 | int rc; |
| 52 | |
| 53 | __ctl_set_bit(0, 9); |
| 54 | rc = sclp_service_call(cmd, sccb); |
| 55 | if (rc) |
| 56 | goto out; |
| 57 | __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | |
| 58 | PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT); |
| 59 | local_irq_disable(); |
| 60 | out: |
| 61 | /* Contents of the sccb might have changed. */ |
| 62 | barrier(); |
| 63 | __ctl_clear_bit(0, 9); |
| 64 | return rc; |
| 65 | } |
| 66 | |
Hendrik Brueckner | 56e57a8 | 2013-12-05 19:03:50 +0100 | [diff] [blame] | 67 | static int __init sclp_read_info_early(struct read_info_sccb *sccb) |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 68 | { |
Hendrik Brueckner | 333cce9 | 2013-12-05 18:46:51 +0100 | [diff] [blame] | 69 | int rc, i; |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 70 | sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, |
| 71 | SCLP_CMDW_READ_SCP_INFO}; |
| 72 | |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 73 | for (i = 0; i < ARRAY_SIZE(commands); i++) { |
| 74 | do { |
| 75 | memset(sccb, 0, sizeof(*sccb)); |
| 76 | sccb->header.length = sizeof(*sccb); |
| 77 | sccb->header.function_code = 0x80; |
| 78 | sccb->header.control_mask[2] = 0x80; |
| 79 | rc = sclp_cmd_sync_early(commands[i], sccb); |
| 80 | } while (rc == -EBUSY); |
| 81 | |
| 82 | if (rc) |
| 83 | break; |
Hendrik Brueckner | 333cce9 | 2013-12-05 18:46:51 +0100 | [diff] [blame] | 84 | if (sccb->header.response_code == 0x10) |
| 85 | return 0; |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 86 | if (sccb->header.response_code != 0x1f0) |
| 87 | break; |
| 88 | } |
Hendrik Brueckner | 333cce9 | 2013-12-05 18:46:51 +0100 | [diff] [blame] | 89 | return -EIO; |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 90 | } |
| 91 | |
Hendrik Brueckner | 5d5de1a | 2013-12-05 19:13:36 +0100 | [diff] [blame] | 92 | static void __init sclp_facilities_detect(struct read_info_sccb *sccb) |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 93 | { |
Hendrik Brueckner | 56e57a8 | 2013-12-05 19:03:50 +0100 | [diff] [blame] | 94 | if (sclp_read_info_early(sccb)) |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 95 | return; |
| 96 | |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 97 | sclp_facilities = sccb->facilities; |
| 98 | sclp_fac84 = sccb->fac84; |
| 99 | if (sccb->fac85 & 0x02) |
| 100 | S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; |
| 101 | sclp_rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; |
| 102 | sclp_rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; |
| 103 | sclp_rzm <<= 20; |
Hendrik Brueckner | 333cce9 | 2013-12-05 18:46:51 +0100 | [diff] [blame] | 104 | |
| 105 | /* Save IPL information */ |
| 106 | sclp_ipl_info.is_valid = 1; |
| 107 | if (sccb->flags & 0x2) |
| 108 | sclp_ipl_info.has_dump = 1; |
| 109 | memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN); |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 110 | } |
| 111 | |
| 112 | bool __init sclp_has_linemode(void) |
| 113 | { |
Hendrik Brueckner | 52733e0 | 2013-12-05 19:28:39 +0100 | [diff] [blame] | 114 | return !!sclp_con_has_linemode; |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | bool __init sclp_has_vt220(void) |
| 118 | { |
Hendrik Brueckner | 52733e0 | 2013-12-05 19:28:39 +0100 | [diff] [blame] | 119 | return !!sclp_con_has_vt220; |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | unsigned long long sclp_get_rnmax(void) |
| 123 | { |
| 124 | return sclp_rnmax; |
| 125 | } |
| 126 | |
| 127 | unsigned long long sclp_get_rzm(void) |
| 128 | { |
| 129 | return sclp_rzm; |
| 130 | } |
| 131 | |
| 132 | /* |
| 133 | * This function will be called after sclp_facilities_detect(), which gets |
Hendrik Brueckner | 333cce9 | 2013-12-05 18:46:51 +0100 | [diff] [blame] | 134 | * called from early.c code. The sclp_facilities_detect() function retrieves |
| 135 | * and saves the IPL information. |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 136 | */ |
| 137 | void __init sclp_get_ipl_info(struct sclp_ipl_info *info) |
| 138 | { |
Hendrik Brueckner | 333cce9 | 2013-12-05 18:46:51 +0100 | [diff] [blame] | 139 | *info = sclp_ipl_info; |
Michael Holzheu | acf6a00 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 140 | } |
| 141 | |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 142 | static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb) |
| 143 | { |
| 144 | int rc; |
| 145 | |
| 146 | do { |
| 147 | rc = sclp_cmd_sync_early(cmd, sccb); |
| 148 | } while (rc == -EBUSY); |
| 149 | |
| 150 | if (rc) |
| 151 | return -EIO; |
| 152 | if (((struct sccb_header *) sccb)->response_code != 0x0020) |
| 153 | return -EIO; |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | static void __init sccb_init_eq_size(struct sdias_sccb *sccb) |
| 158 | { |
| 159 | memset(sccb, 0, sizeof(*sccb)); |
| 160 | |
| 161 | sccb->hdr.length = sizeof(*sccb); |
| 162 | sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf); |
| 163 | sccb->evbuf.hdr.type = EVTYP_SDIAS; |
| 164 | sccb->evbuf.event_qual = SDIAS_EQ_SIZE; |
| 165 | sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP; |
| 166 | sccb->evbuf.event_id = 4712; |
| 167 | sccb->evbuf.dbs = 1; |
| 168 | } |
| 169 | |
Hendrik Brueckner | 5d5de1a | 2013-12-05 19:13:36 +0100 | [diff] [blame] | 170 | static int __init sclp_set_event_mask(struct init_sccb *sccb, |
| 171 | unsigned long receive_mask, |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 172 | unsigned long send_mask) |
| 173 | { |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 174 | memset(sccb, 0, sizeof(*sccb)); |
| 175 | sccb->header.length = sizeof(*sccb); |
| 176 | sccb->mask_length = sizeof(sccb_mask_t); |
| 177 | sccb->receive_mask = receive_mask; |
| 178 | sccb->send_mask = send_mask; |
| 179 | return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb); |
| 180 | } |
| 181 | |
Hendrik Brueckner | 5d5de1a | 2013-12-05 19:13:36 +0100 | [diff] [blame] | 182 | static long __init sclp_hsa_size_init(struct sdias_sccb *sccb) |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 183 | { |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 184 | sccb_init_eq_size(sccb); |
| 185 | if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb)) |
| 186 | return -EIO; |
Michael Holzheu | 9499934 | 2014-02-24 14:30:00 +0100 | [diff] [blame^] | 187 | if (sccb->evbuf.blk_cnt == 0) |
| 188 | return 0; |
| 189 | return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 190 | } |
| 191 | |
Hendrik Brueckner | 5d5de1a | 2013-12-05 19:13:36 +0100 | [diff] [blame] | 192 | static long __init sclp_hsa_copy_wait(struct sccb_header *sccb) |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 193 | { |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 194 | memset(sccb, 0, PAGE_SIZE); |
| 195 | sccb->length = PAGE_SIZE; |
| 196 | if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb)) |
| 197 | return -EIO; |
Michael Holzheu | 9499934 | 2014-02-24 14:30:00 +0100 | [diff] [blame^] | 198 | if (((struct sdias_sccb *) sccb)->evbuf.blk_cnt == 0) |
| 199 | return 0; |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 200 | return (((struct sdias_sccb *) sccb)->evbuf.blk_cnt - 1) * PAGE_SIZE; |
| 201 | } |
| 202 | |
| 203 | unsigned long sclp_get_hsa_size(void) |
| 204 | { |
| 205 | return sclp_hsa_size; |
| 206 | } |
| 207 | |
Hendrik Brueckner | 5d5de1a | 2013-12-05 19:13:36 +0100 | [diff] [blame] | 208 | static void __init sclp_hsa_size_detect(void *sccb) |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 209 | { |
| 210 | long size; |
| 211 | |
| 212 | /* First try synchronous interface (LPAR) */ |
Hendrik Brueckner | 5d5de1a | 2013-12-05 19:13:36 +0100 | [diff] [blame] | 213 | if (sclp_set_event_mask(sccb, 0, 0x40000010)) |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 214 | return; |
Hendrik Brueckner | 5d5de1a | 2013-12-05 19:13:36 +0100 | [diff] [blame] | 215 | size = sclp_hsa_size_init(sccb); |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 216 | if (size < 0) |
| 217 | return; |
| 218 | if (size != 0) |
| 219 | goto out; |
| 220 | /* Then try asynchronous interface (z/VM) */ |
Hendrik Brueckner | 5d5de1a | 2013-12-05 19:13:36 +0100 | [diff] [blame] | 221 | if (sclp_set_event_mask(sccb, 0x00000010, 0x40000010)) |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 222 | return; |
Hendrik Brueckner | 5d5de1a | 2013-12-05 19:13:36 +0100 | [diff] [blame] | 223 | size = sclp_hsa_size_init(sccb); |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 224 | if (size < 0) |
| 225 | return; |
Hendrik Brueckner | 5d5de1a | 2013-12-05 19:13:36 +0100 | [diff] [blame] | 226 | size = sclp_hsa_copy_wait(sccb); |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 227 | if (size < 0) |
| 228 | return; |
| 229 | out: |
Michael Holzheu | e657d8f | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 230 | sclp_hsa_size = size; |
| 231 | } |
Michael Holzheu | 7b50da5 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 232 | |
Hendrik Brueckner | 52733e0 | 2013-12-05 19:28:39 +0100 | [diff] [blame] | 233 | static unsigned int __init sclp_con_check_linemode(struct init_sccb *sccb) |
| 234 | { |
| 235 | if (!(sccb->sclp_send_mask & (EVTYP_OPCMD_MASK | EVTYP_PMSGCMD_MASK))) |
| 236 | return 0; |
| 237 | if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK))) |
| 238 | return 0; |
| 239 | return 1; |
| 240 | } |
| 241 | |
| 242 | static void __init sclp_console_detect(struct init_sccb *sccb) |
| 243 | { |
| 244 | if (sccb->header.response_code != 0x20) |
| 245 | return; |
| 246 | |
| 247 | if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) |
| 248 | sclp_con_has_vt220 = 1; |
| 249 | |
| 250 | if (sclp_con_check_linemode(sccb)) |
| 251 | sclp_con_has_linemode = 1; |
| 252 | } |
| 253 | |
Michael Holzheu | 7b50da5 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 254 | void __init sclp_early_detect(void) |
| 255 | { |
Hendrik Brueckner | 5d5de1a | 2013-12-05 19:13:36 +0100 | [diff] [blame] | 256 | void *sccb = &sccb_early; |
| 257 | |
| 258 | sclp_facilities_detect(sccb); |
| 259 | sclp_hsa_size_detect(sccb); |
Hendrik Brueckner | 52733e0 | 2013-12-05 19:28:39 +0100 | [diff] [blame] | 260 | |
| 261 | /* Turn off SCLP event notifications. Also save remote masks in the |
| 262 | * sccb. These are sufficient to detect sclp console capabilities. |
| 263 | */ |
Hendrik Brueckner | 5d5de1a | 2013-12-05 19:13:36 +0100 | [diff] [blame] | 264 | sclp_set_event_mask(sccb, 0, 0); |
Hendrik Brueckner | 52733e0 | 2013-12-05 19:28:39 +0100 | [diff] [blame] | 265 | sclp_console_detect(sccb); |
Michael Holzheu | 7b50da5 | 2013-11-13 10:38:27 +0100 | [diff] [blame] | 266 | } |