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/*
* SCLP early driver
*
* Copyright IBM Corp. 2013
*/
#define KMSG_COMPONENT "sclp_early"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <asm/ctl_reg.h>
#include <asm/sclp.h>
#include <asm/ipl.h>
#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);
}
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