/* * SCLP early driver * * Copyright IBM Corp. 2013 */ #define KMSG_COMPONENT "sclp_early" #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt #include #include #include #include "sclp_sdias.h" #include "sclp.h" #define SCLP_CMDW_READ_SCP_INFO 0x00020001 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001 struct read_info_sccb { struct sccb_header header; /* 0-7 */ u16 rnmax; /* 8-9 */ u8 rnsize; /* 10 */ u8 _reserved0[24 - 11]; /* 11-15 */ u8 loadparm[8]; /* 24-31 */ u8 _reserved1[48 - 32]; /* 32-47 */ u64 facilities; /* 48-55 */ u8 _reserved2[84 - 56]; /* 56-83 */ u8 fac84; /* 84 */ u8 fac85; /* 85 */ u8 _reserved3[91 - 86]; /* 86-90 */ u8 flags; /* 91 */ u8 _reserved4[100 - 92]; /* 92-99 */ u32 rnsize2; /* 100-103 */ u64 rnmax2; /* 104-111 */ u8 _reserved5[4096 - 112]; /* 112-4095 */ } __packed __aligned(PAGE_SIZE); static __initdata struct init_sccb early_event_mask_sccb __aligned(PAGE_SIZE); static __initdata struct read_info_sccb early_read_info_sccb; static __initdata char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE); static unsigned long sclp_hsa_size; __initdata int sclp_early_read_info_sccb_valid; u64 sclp_facilities; u8 sclp_fac84; unsigned long long sclp_rzm; unsigned long long sclp_rnmax; static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb) { int rc; __ctl_set_bit(0, 9); rc = sclp_service_call(cmd, sccb); if (rc) goto out; __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT); local_irq_disable(); out: /* Contents of the sccb might have changed. */ barrier(); __ctl_clear_bit(0, 9); return rc; } static void __init sclp_read_info_early(void) { int rc; int i; struct read_info_sccb *sccb; sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED, SCLP_CMDW_READ_SCP_INFO}; sccb = &early_read_info_sccb; for (i = 0; i < ARRAY_SIZE(commands); i++) { do { memset(sccb, 0, sizeof(*sccb)); sccb->header.length = sizeof(*sccb); sccb->header.function_code = 0x80; sccb->header.control_mask[2] = 0x80; rc = sclp_cmd_sync_early(commands[i], sccb); } while (rc == -EBUSY); if (rc) break; if (sccb->header.response_code == 0x10) { sclp_early_read_info_sccb_valid = 1; break; } if (sccb->header.response_code != 0x1f0) break; } } static void __init sclp_facilities_detect(void) { struct read_info_sccb *sccb; sclp_read_info_early(); if (!sclp_early_read_info_sccb_valid) return; sccb = &early_read_info_sccb; sclp_facilities = sccb->facilities; sclp_fac84 = sccb->fac84; if (sccb->fac85 & 0x02) S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP; sclp_rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2; sclp_rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2; sclp_rzm <<= 20; } bool __init sclp_has_linemode(void) { struct init_sccb *sccb = &early_event_mask_sccb; if (sccb->header.response_code != 0x20) return 0; if (!(sccb->sclp_send_mask & (EVTYP_OPCMD_MASK | EVTYP_PMSGCMD_MASK))) return 0; if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK))) return 0; return 1; } bool __init sclp_has_vt220(void) { struct init_sccb *sccb = &early_event_mask_sccb; if (sccb->header.response_code != 0x20) return 0; if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK) return 1; return 0; } unsigned long long sclp_get_rnmax(void) { return sclp_rnmax; } unsigned long long sclp_get_rzm(void) { return sclp_rzm; } /* * This function will be called after sclp_facilities_detect(), which gets * called from early.c code. Therefore the sccb should have valid contents. */ void __init sclp_get_ipl_info(struct sclp_ipl_info *info) { struct read_info_sccb *sccb; if (!sclp_early_read_info_sccb_valid) return; sccb = &early_read_info_sccb; info->is_valid = 1; if (sccb->flags & 0x2) info->has_dump = 1; memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN); } static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb) { int rc; do { rc = sclp_cmd_sync_early(cmd, sccb); } while (rc == -EBUSY); if (rc) return -EIO; if (((struct sccb_header *) sccb)->response_code != 0x0020) return -EIO; return 0; } static void __init sccb_init_eq_size(struct sdias_sccb *sccb) { memset(sccb, 0, sizeof(*sccb)); sccb->hdr.length = sizeof(*sccb); sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf); sccb->evbuf.hdr.type = EVTYP_SDIAS; sccb->evbuf.event_qual = SDIAS_EQ_SIZE; sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP; sccb->evbuf.event_id = 4712; sccb->evbuf.dbs = 1; } static int __init sclp_set_event_mask(unsigned long receive_mask, unsigned long send_mask) { struct init_sccb *sccb = (void *) &sccb_early; memset(sccb, 0, sizeof(*sccb)); sccb->header.length = sizeof(*sccb); sccb->mask_length = sizeof(sccb_mask_t); sccb->receive_mask = receive_mask; sccb->send_mask = send_mask; return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb); } static long __init sclp_hsa_size_init(void) { struct sdias_sccb *sccb = (void *) &sccb_early; sccb_init_eq_size(sccb); if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb)) return -EIO; if (sccb->evbuf.blk_cnt != 0) return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE; return 0; } static long __init sclp_hsa_copy_wait(void) { struct sccb_header *sccb = (void *) &sccb_early; memset(sccb, 0, PAGE_SIZE); sccb->length = PAGE_SIZE; if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb)) return -EIO; return (((struct sdias_sccb *) sccb)->evbuf.blk_cnt - 1) * PAGE_SIZE; } unsigned long sclp_get_hsa_size(void) { return sclp_hsa_size; } static void __init sclp_hsa_size_detect(void) { long size; /* First try synchronous interface (LPAR) */ if (sclp_set_event_mask(0, 0x40000010)) return; size = sclp_hsa_size_init(); if (size < 0) return; if (size != 0) goto out; /* Then try asynchronous interface (z/VM) */ if (sclp_set_event_mask(0x00000010, 0x40000010)) return; size = sclp_hsa_size_init(); if (size < 0) return; size = sclp_hsa_copy_wait(); if (size < 0) return; out: sclp_hsa_size = size; } void __init sclp_early_detect(void) { sclp_facilities_detect(); sclp_hsa_size_detect(); sclp_set_event_mask(0, 0); }