277 lines
6.7 KiB
C
277 lines
6.7 KiB
C
/*
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* SCLP early driver
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*
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* Copyright IBM Corp. 2013
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*/
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#define KMSG_COMPONENT "sclp_early"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <asm/ctl_reg.h>
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#include <asm/sclp.h>
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#include <asm/ipl.h>
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#include "sclp_sdias.h"
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#include "sclp.h"
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#define SCLP_CMDW_READ_SCP_INFO 0x00020001
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#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
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struct read_info_sccb {
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struct sccb_header header; /* 0-7 */
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u16 rnmax; /* 8-9 */
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u8 rnsize; /* 10 */
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u8 _pad_11[16 - 11]; /* 11-15 */
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u16 ncpurl; /* 16-17 */
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u16 cpuoff; /* 18-19 */
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u8 _pad_20[24 - 20]; /* 20-23 */
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u8 loadparm[8]; /* 24-31 */
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u8 _pad_32[42 - 32]; /* 32-41 */
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u8 fac42; /* 42 */
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u8 fac43; /* 43 */
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u8 _pad_44[48 - 44]; /* 44-47 */
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u64 facilities; /* 48-55 */
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u8 _pad_56[66 - 56]; /* 56-65 */
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u8 fac66; /* 66 */
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u8 _pad_67[76 - 67]; /* 67-83 */
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u32 ibc; /* 76-79 */
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u8 _pad80[84 - 80]; /* 80-83 */
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u8 fac84; /* 84 */
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u8 fac85; /* 85 */
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u8 _pad_86[91 - 86]; /* 86-90 */
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u8 flags; /* 91 */
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u8 _pad_92[100 - 92]; /* 92-99 */
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u32 rnsize2; /* 100-103 */
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u64 rnmax2; /* 104-111 */
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u8 _pad_112[120 - 112]; /* 112-119 */
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u16 hcpua; /* 120-121 */
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u8 _pad_122[4096 - 122]; /* 122-4095 */
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} __packed __aligned(PAGE_SIZE);
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static char sccb_early[PAGE_SIZE] __aligned(PAGE_SIZE) __initdata;
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static struct sclp_ipl_info sclp_ipl_info;
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struct sclp_info sclp;
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EXPORT_SYMBOL(sclp);
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static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
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{
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int rc;
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__ctl_set_bit(0, 9);
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rc = sclp_service_call(cmd, sccb);
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if (rc)
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goto out;
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__load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
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PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
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local_irq_disable();
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out:
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/* Contents of the sccb might have changed. */
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barrier();
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__ctl_clear_bit(0, 9);
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return rc;
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}
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static int __init sclp_read_info_early(struct read_info_sccb *sccb)
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{
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int rc, i;
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sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
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SCLP_CMDW_READ_SCP_INFO};
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for (i = 0; i < ARRAY_SIZE(commands); i++) {
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do {
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memset(sccb, 0, sizeof(*sccb));
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sccb->header.length = sizeof(*sccb);
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sccb->header.function_code = 0x80;
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sccb->header.control_mask[2] = 0x80;
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rc = sclp_cmd_sync_early(commands[i], sccb);
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} while (rc == -EBUSY);
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if (rc)
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break;
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if (sccb->header.response_code == 0x10)
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return 0;
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if (sccb->header.response_code != 0x1f0)
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break;
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}
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return -EIO;
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}
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static void __init sclp_facilities_detect(struct read_info_sccb *sccb)
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{
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struct sclp_cpu_entry *cpue;
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u16 boot_cpu_address, cpu;
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if (sclp_read_info_early(sccb))
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return;
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sclp.facilities = sccb->facilities;
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sclp.has_sprp = !!(sccb->fac84 & 0x02);
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sclp.has_cpu_type = !!(sccb->fac84 & 0x01);
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if (sccb->fac85 & 0x02)
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S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
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sclp.rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
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sclp.rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
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sclp.rzm <<= 20;
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sclp.ibc = sccb->ibc;
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if (!sccb->hcpua) {
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if (MACHINE_IS_VM)
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sclp.max_cpu = 64;
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else
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sclp.max_cpu = sccb->ncpurl;
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} else {
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sclp.max_cpu = sccb->hcpua + 1;
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}
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boot_cpu_address = stap();
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cpue = (void *)sccb + sccb->cpuoff;
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for (cpu = 0; cpu < sccb->ncpurl; cpue++, cpu++) {
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if (boot_cpu_address != cpue->core_id)
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continue;
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sclp.has_siif = cpue->siif;
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sclp.has_sigpif = cpue->sigpif;
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break;
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}
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/* Save IPL information */
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sclp_ipl_info.is_valid = 1;
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if (sccb->flags & 0x2)
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sclp_ipl_info.has_dump = 1;
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memcpy(&sclp_ipl_info.loadparm, &sccb->loadparm, LOADPARM_LEN);
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sclp.mtid = (sccb->fac42 & 0x80) ? (sccb->fac42 & 31) : 0;
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sclp.mtid_cp = (sccb->fac42 & 0x80) ? (sccb->fac43 & 31) : 0;
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sclp.mtid_prev = (sccb->fac42 & 0x80) ? (sccb->fac66 & 31) : 0;
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}
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/*
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* This function will be called after sclp_facilities_detect(), which gets
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* called from early.c code. The sclp_facilities_detect() function retrieves
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* and saves the IPL information.
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*/
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void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
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{
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*info = sclp_ipl_info;
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}
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static int __init sclp_cmd_early(sclp_cmdw_t cmd, void *sccb)
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{
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int rc;
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do {
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rc = sclp_cmd_sync_early(cmd, sccb);
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} while (rc == -EBUSY);
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if (rc)
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return -EIO;
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if (((struct sccb_header *) sccb)->response_code != 0x0020)
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return -EIO;
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return 0;
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}
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static void __init sccb_init_eq_size(struct sdias_sccb *sccb)
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{
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memset(sccb, 0, sizeof(*sccb));
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sccb->hdr.length = sizeof(*sccb);
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sccb->evbuf.hdr.length = sizeof(struct sdias_evbuf);
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sccb->evbuf.hdr.type = EVTYP_SDIAS;
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sccb->evbuf.event_qual = SDIAS_EQ_SIZE;
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sccb->evbuf.data_id = SDIAS_DI_FCP_DUMP;
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sccb->evbuf.event_id = 4712;
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sccb->evbuf.dbs = 1;
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}
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static int __init sclp_set_event_mask(struct init_sccb *sccb,
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unsigned long receive_mask,
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unsigned long send_mask)
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{
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memset(sccb, 0, sizeof(*sccb));
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sccb->header.length = sizeof(*sccb);
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sccb->mask_length = sizeof(sccb_mask_t);
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sccb->receive_mask = receive_mask;
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sccb->send_mask = send_mask;
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return sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb);
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}
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static long __init sclp_hsa_size_init(struct sdias_sccb *sccb)
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{
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sccb_init_eq_size(sccb);
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if (sclp_cmd_early(SCLP_CMDW_WRITE_EVENT_DATA, sccb))
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return -EIO;
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if (sccb->evbuf.blk_cnt == 0)
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return 0;
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return (sccb->evbuf.blk_cnt - 1) * PAGE_SIZE;
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}
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static long __init sclp_hsa_copy_wait(struct sccb_header *sccb)
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{
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memset(sccb, 0, PAGE_SIZE);
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sccb->length = PAGE_SIZE;
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if (sclp_cmd_early(SCLP_CMDW_READ_EVENT_DATA, sccb))
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return -EIO;
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if (((struct sdias_sccb *) sccb)->evbuf.blk_cnt == 0)
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return 0;
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return (((struct sdias_sccb *) sccb)->evbuf.blk_cnt - 1) * PAGE_SIZE;
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}
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static void __init sclp_hsa_size_detect(void *sccb)
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{
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long size;
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/* First try synchronous interface (LPAR) */
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if (sclp_set_event_mask(sccb, 0, 0x40000010))
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return;
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size = sclp_hsa_size_init(sccb);
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if (size < 0)
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return;
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if (size != 0)
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goto out;
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/* Then try asynchronous interface (z/VM) */
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if (sclp_set_event_mask(sccb, 0x00000010, 0x40000010))
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return;
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size = sclp_hsa_size_init(sccb);
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if (size < 0)
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return;
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size = sclp_hsa_copy_wait(sccb);
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if (size < 0)
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return;
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out:
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sclp.hsa_size = size;
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}
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static unsigned int __init sclp_con_check_linemode(struct init_sccb *sccb)
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{
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if (!(sccb->sclp_send_mask & EVTYP_OPCMD_MASK))
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return 0;
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if (!(sccb->sclp_receive_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK)))
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return 0;
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return 1;
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}
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static void __init sclp_console_detect(struct init_sccb *sccb)
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{
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if (sccb->header.response_code != 0x20)
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return;
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if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK)
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sclp.has_vt220 = 1;
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if (sclp_con_check_linemode(sccb))
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sclp.has_linemode = 1;
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}
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void __init sclp_early_detect(void)
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{
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void *sccb = &sccb_early;
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sclp_facilities_detect(sccb);
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sclp_hsa_size_detect(sccb);
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/* Turn off SCLP event notifications. Also save remote masks in the
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* sccb. These are sufficient to detect sclp console capabilities.
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*/
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sclp_set_event_mask(sccb, 0, 0);
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sclp_console_detect(sccb);
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}
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