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s390/mem_detect: introduce SCLP storage info

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SCLP storage info allows to detect continuous and non-continuous online
memory under LPAR, z/VM and KVM, when standby memory is defined.

Reviewed-by: Heiko Carstens <[email protected]>
Reviewed-by: Martin Schwidefsky <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>
Signed-off-by: Martin Schwidefsky <[email protected]>
This commit is contained in:
Vasily Gorbik 2018-04-11 18:42:37 +02:00 • committed by Martin Schwidefsky
commit fddbaa5c42
6 changed files with 74 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

10
drivers/s390/char/sclp.h
View file

@ -64,6 +64,7 @@ typedef unsigned int sclp_cmdw_t;
#define SCLP_CMDW_READ_CPU_INFO 0x00010001
#define SCLP_CMDW_READ_SCP_INFO 0x00020001
#define SCLP_CMDW_READ_STORAGE_INFO 0x00040001
#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
#define SCLP_CMDW_READ_EVENT_DATA 0x00770005
#define SCLP_CMDW_WRITE_EVENT_DATA 0x00760005
@ -197,6 +198,15 @@ struct read_info_sccb {
u8 _pad_128[4096 - 128]; /* 128-4095 */
} __packed __aligned(PAGE_SIZE);
struct read_storage_sccb {
struct sccb_header header;
u16 max_id;
u16 assigned;
u16 standby;
u16 :16;
u32 entries[0];
} __packed;
static inline void sclp_fill_core_info(struct sclp_core_info *info,
struct read_cpu_info_sccb *sccb)
{

11
drivers/s390/char/sclp_cmd.c
View file

@ -460,15 +460,6 @@ static int sclp_mem_freeze(struct device *dev)
return -EPERM;
}
struct read_storage_sccb {
struct sccb_header header;
u16 max_id;
u16 assigned;
u16 standby;
u16 :16;
u32 entries[0];
} __packed;
static const struct dev_pm_ops sclp_mem_pm_ops = {
.freeze = sclp_mem_freeze,
};
@ -498,7 +489,7 @@ static int __init sclp_detect_standby_memory(void)
for (id = 0; id <= sclp_max_storage_id; id++) {
memset(sccb, 0, PAGE_SIZE);
sccb->header.length = PAGE_SIZE;
rc = sclp_sync_request(0x00040001 | id << 8, sccb);
rc = sclp_sync_request(SCLP_CMDW_READ_STORAGE_INFO | id << 8, sccb);
if (rc)
goto out;
switch (sccb->header.response_code) {

53
drivers/s390/char/sclp_early_core.c
View file

@ -10,6 +10,7 @@
#include <asm/ebcdic.h>
#include <asm/irq.h>
#include <asm/sections.h>
#include <asm/mem_detect.h>
#include "sclp.h"
#include "sclp_rw.h"
@ -287,3 +288,55 @@ int __init sclp_early_get_meminfo(unsigned long *mem, unsigned long *rzm)
*rzm = rnsize;
return 0;
}
#define SCLP_STORAGE_INFO_FACILITY 0x0000400000000000UL
void __weak __init add_mem_detect_block(u64 start, u64 end) {}
int __init sclp_early_read_storage_info(void)
{
struct read_storage_sccb *sccb = (struct read_storage_sccb *)&sclp_early_sccb;
int rc, id, max_id = 0;
unsigned long rn, rzm;
sclp_cmdw_t command;
u16 sn;
if (!sclp_info_sccb_valid)
return -EIO;
if (!(sclp_info_sccb.facilities & SCLP_STORAGE_INFO_FACILITY))
return -EOPNOTSUPP;
rzm = sclp_info_sccb.rnsize ?: sclp_info_sccb.rnsize2;
rzm <<= 20;
for (id = 0; id <= max_id; id++) {
memset(sclp_early_sccb, 0, sizeof(sclp_early_sccb));
sccb->header.length = sizeof(sclp_early_sccb);
command = SCLP_CMDW_READ_STORAGE_INFO | (id << 8);
rc = sclp_early_cmd(command, sccb);
if (rc)
goto fail;
max_id = sccb->max_id;
switch (sccb->header.response_code) {
case 0x0010:
for (sn = 0; sn < sccb->assigned; sn++) {
if (!sccb->entries[sn])
continue;
rn = sccb->entries[sn] >> 16;
add_mem_detect_block((rn - 1) * rzm, rn * rzm);
}
break;
case 0x0310:
case 0x0410:
break;
default:
goto fail;
}
}
return 0;
fail:
mem_detect.count = 0;
return -EIO;
}